CN100474375C - Method and apparatus for driving electro-luminescence display panel - Google Patents

Method and apparatus for driving electro-luminescence display panel Download PDF

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Publication number
CN100474375C
CN100474375C CNB2005100966200A CN200510096620A CN100474375C CN 100474375 C CN100474375 C CN 100474375C CN B2005100966200 A CNB2005100966200 A CN B2005100966200A CN 200510096620 A CN200510096620 A CN 200510096620A CN 100474375 C CN100474375 C CN 100474375C
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voltage
aging
period
sweep trace
digestion period
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CN1737893A (en
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裵孝大
金学洙
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LG Electronics Inc
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LG Electronics Inc
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0286—Details of a shift registers arranged for use in a driving circuit

Abstract

The present invention relates to a method and apparatus for driving an electro-luminescence display panel capable of doing an aging operation upon driving. A method of driving an electro-luminescence display panel according to the present invention includes: a scan period when electro-luminescence cells formed at a cross of both a plurality of scan lines and a plurality of data lines are line-sequentially emitted; and an aging period when an aging is performed in the electro-luminescence cells at the same time by applying a reverse bias, wherein the scan period and the aging period are repeated for each frame.

Description

Be used to drive the method and apparatus of electroluminescence display panel
The application requires the korean patent application No.P2004-65087 in Korea S's submission on August 18th, 2004, the rights and interests of No.P2004-70600 that submits on September 4th, 2004 and No.P2004-70601 and the No.P2004-118586 that submits on Dec 31st, 2004 comprise it fully and are incorporated herein by reference at this.
Technical field
The present invention relates to electroluminescence display device, and more specifically, relate to the method and apparatus that is used to drive electroluminescence display panel, its (aging) operation of can under the driving situation, wearing out.
Background technology
Recently, developed multiple flat-panel monitor, its weight and volume reduces, and does not have the shortcoming of cathode-ray tube CRT.This flat-panel monitor comprises LCD LCD, Field Emission Display FED, Plasmia indicating panel PDP and electroluminescence (hereinafter, being called EL) display device.
In these equipment, the EL display panel is a light emitting device, and it can come the light emission fluorescent material by electronics and hole compound again.The EL display panel is classified as the inorganic EL panel and the organic EL panel that use organic compound as fluorescent material of use as the fluorescent material of mineral compound usually.This EL display panel has lot of advantages: low voltage drive, autoluminescence, minimal thickness, wide visual angle, rapid response speed and high-contrast etc. make it can become the bright spot in the display device of future generation.
This EL display device comprises: the anode that is formed by transparent conductive material on substrate; With the hole injection layer of making by organic material, hole carriers layer, luminescent layer, electron carrier layer and electron injecting layer, and by the metal negative electrode with low work content that deposits therein.If forward voltage is added between anode and the negative electrode, the electronics that produces from negative electrode moves through electron injecting layer and electron carrier layer to luminescent layer afterwards, and moves through hole injection layer and hole carriers layer to luminescent layer from the hole that anode produces.Therefore, compound again each other at luminescent layer, luminous thus from the electronics and the hole of electron carrier layer and the feed-in of hole carriers layer.Under this situation, the brightness of organic EL display apparatus and the electric current between anode and negative electrode are directly proportional.
Fig. 1 is the circuit diagram that shows the passive matrix type organic EL display apparatus equivalently, wherein arrange organic EL with matrix-type, and Fig. 2 is the drive waveforms of EL panel 20 as shown in Figure 1.
EL display device as shown in Figure 1 comprises: the EL panel 20 with the EL unit 26 that forms in the point of crossing of sweep trace SL1-SLn and data line DL1-DLm; The scanner driver 22 that is used for driven sweep line SL1-SLn; With the data driver 24 that is used for driving data lines DL1-DLm.
Each the EL unit 26 that forms at EL panel 20 is represented as a diode, and it is connected between data line DL and the sweep trace SL with the forward direction direction.Here, data line DL is anode equivalently, and sweep trace SL is negative electrode equivalently.If with negative scanning impulse, that is, low scanning voltage Vlow is provided to sweep trace SL, and positive data-signal (electric current) is provided to data line DL, as shown in Figure 2, then forward voltage is added to each EL unit 26, each EL unit 26 is luminous to produce the light corresponding to data-signal then.On the other hand, if high scanning impulse Vhigh is provided to sweep trace SL thus reverse voltage is added to each EL unit 26, each EL unit 26 is not luminous so.
As shown in Figure 2, scanner driver 22 is provided to n sweep trace SL1-SLn with the scanning impulse order.In other words, scanner driver 22 will hang down scanning voltage Vlow and be provided to sweep trace SL1-SLn in proper order during the scan period, make sweep trace SL1-SLn be activated with order thus, and during the reset cycle, provide high scanning impulse Vhigh so that sweep trace SL1-SLn is disabled.In addition, scanner driver 22 drives for the order of each frame F multiple scanning line SL1-SLn.
When sweep trace SL1-SLn was activated, data driver 24 provided data-signal to m sweep trace SL1-SLn for each cycle.
For the stabilized driving of the organic EL display apparatus of prior art, in manufacture process, carry out making EL unit 26 be in the burin-in process of reverse-bias state.But, even during manufacture process, carry out burin-in process at organic EL display apparatus, organic EL display apparatus still has problems, promptly, because EL unit 26 worsens along with the increase of driving time, or, make its lifetime such as short circuit defective (short defect) because tension force produces line defect (line defect).In order to address this problem, when driving organic EL display apparatus, need burin-in process.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of method and apparatus that is used to drive electroluminescence display panel, its operation of can under the driving situation, wearing out.
In order to realize these and other objects of the present invention, comprise: the scan period when sequential lines is transmitted in the electroluminescence cell that the point of crossing of a plurality of sweep traces and a plurality of data lines forms according to the method for driving electroluminescence display panel of the present invention; Digestion period with when execution is aging in electroluminescence cell simultaneously by the application reverse bias, wherein repeat scan period and digestion period for each frame.
In digestion period, high scanning voltage is provided to a plurality of sweep traces, and low-voltage is provided to a plurality of data lines.
In the scan period, will hang down scanning voltage and be provided to sweep trace and be used to enable, and the first high scanning voltage is provided to sweep trace is used for forbidding, and wherein in digestion period, will be provided to a plurality of sweep traces greater than the second high scanning voltage of the first high scanning voltage.
Method according to driving electroluminescence display panel of the present invention comprises: the scan period when electroluminescence cell that the point of crossing that is transmitted in a plurality of sweep traces and a plurality of data lines forms; With when when suspending a plurality of data line, producing voltage difference between the adjacent scanning lines so that in electroluminescence cell, carry out digestion period when aging.
In digestion period, reciprocal aging voltage is added to adjacent sweep trace.
In digestion period, any one aging voltage of high and low aging voltage is added to odd-numbered scan lines, and will be added to the even-line interlace line by opposite aging voltage with the aging voltage of odd-numbered scan lines.
The aging voltage that is added to a plurality of sweep traces in digestion period oppositely at least once.
To be divided into digestion period, and it is reverse for the frontier point in the cycle of each division to be added to the aging voltage of each sweep trace in a plurality of cycles.
The aging voltage that is added to each sweep trace in the cycle of dividing at least more oppositely once.
In the scan period, to hang down scanning voltage is provided to sweep trace and is used to enable, and the first high scanning voltage is provided to sweep trace is used for forbidding, and wherein in digestion period, to provide as high aging voltage more than or equal to the second high scanning voltage of the first high scanning voltage, and will hang down scanning voltage and provide as low aging voltage.
For each frame multiple scanning cycle and digestion period.
Method according to driving electroluminescence display panel of the present invention comprises: the scan period when electroluminescence cell that the point of crossing that is transmitted in a plurality of sweep traces and a plurality of data lines forms; And when when suspending a plurality of data line in the voltage difference that produces many level between the adjacent scanning lines so that in electroluminescence cell, carry out digestion period when aging.
In digestion period, will with must be reciprocal the aging voltage that changes of order be added to adjacent sweep trace.
Further comprise the neutralization stage when identical aging voltage is added to adjacent scanning lines digestion period.
In digestion period, many level aging voltage that the voltage difference between odd-numbered scan lines and even-line interlace line is wherein increased in proper order or reduces is added to sweep trace.
In digestion period, the voltage difference between odd-numbered scan lines and even-line interlace line wherein increased in proper order reduce then or many level aging voltage that order reduces to increase then is added to sweep trace.
In digestion period, the aging voltage of changing into many level is added to odd-numbered scan lines, and the aging voltage that will change with the order opposite with the aging voltage of odd-numbered scan lines is added to the even-line interlace line.
In digestion period, many level aging voltage that order is increased is added to any one of odd-numbered scan lines and even-line interlace line, and many level aging voltage that order is reduced is added to remaining sweep trace.
In digestion period, the many level aging voltage that reduces after order increased is added to any one in odd-numbered scan lines and the even-line interlace line, and order is reduced and many level aging voltage of increasing afterwards is added to the residue sweep trace.
In digestion period, order increased or many level aging voltage of reducing is added to any one of odd-numbered scan lines and even-line interlace line, and stop voltage is added to remaining sweep trace.
In digestion period, order increased and reduce afterwards or order reduces and many level aging voltage of increasing afterwards is added in odd-numbered scan lines and the even-line interlace line any one, and stop voltage is added to remaining sweep trace.
The stop voltage that applies in digestion period is identical with the voltage of the minimum aging voltage of many level aging voltage.
The stop voltage that applies in digestion period is with to be provided to the low scanning voltage of sweep trace identical as enabling voltage in the scan period.
Further comprise neutralization stage digestion period, wherein identical aging voltage is added to the odd and even number sweep trace.
The odd and even number sweep trace is identical with the medium voltage of many level aging voltage in neutralization stage.
Many level aging voltage is that wherein the voltage between the highest aging voltage and minimum aging voltage is divided into the voltage of many level, this the highest aging voltage is greater than being provided to the high scanning voltage of sweep trace or equaling high scanning voltage as forbidding voltage, and minimum aging voltage equals as enabling the low scanning voltage that voltage provides.
In digestion period, repeat many level aging voltage.
For each frame multiple scanning cycle and digestion period.
Method according to driving electroluminescence display panel of the present invention comprises: the electroluminescence cell that is transmitted in the point of crossing formation of a plurality of sweep traces and a plurality of data lines in the scan period; In digestion period after the scan period, when the suspension sweep trace, carry out the aging certainly of organic electroluminescence cell, between adjacent data line, to have voltage difference.
In digestion period, be provided to the I sub-pixel that connects data line with first to any one of tertiary voltage, and be provided to the sub-pixel adjacent with the I sub-pixel from the voltage difference of the voltage that is provided to the I sub-pixel.
For each pixel that comprises each sub-pixel, repeated application is provided to the voltage of each sub-pixel.
In digestion period, first be added to each sub-pixel that is connected with data line to tertiary voltage with what differ from one another.
For each pixel that comprises each sub-pixel, repeated application first is to tertiary voltage.
Second voltage has the voltage level that is different from first voltage, and is formed by the suspension tertiary voltage.
Equipment according to driving electroluminescence display panel of the present invention comprises: electroluminescence display panel, and its point of crossing at sweep trace and data line has electroluminescence cell; Scanner driver, it sequentially provides scanning impulse sequentially to provide high aging voltage to whole sweep trace, to comprise scan period and digestion period in each frame to sweep trace and in digestion period in the scan period; And data driver, it provides data-signal to provide low aging voltage to data line, so that whole electroluminescence cell is in reverse-bias state to data line and in digestion period in the scan period.
Scanner driver provides low scanning voltage as scanning impulse in the scan period, and the sweep trace of the first high scanning voltage to forbidding was provided in the scan period, and provides the second high scanning voltage greater than the first high scanning voltage as high aging voltage.
Scanner driver comprises: shift register, it has multistage will begin the pulse displacement so that its beginning pulse as each output signal and displacement next stage to be provided, with a plurality of pseudo-levels (dummy stage), the output signal of last level is to guarantee digestion period in a plurality of levels of its displacement; With the level displacement shifter part, its have a plurality of level displacement shifters with each output signal of level shift shift register it is provided to each sweep trace.
Scanner driver comprises: it has multistage will begin the pulse displacement so that its beginning pulse as each output signal and displacement next stage to be provided; With the level displacement shifter part, its have a plurality of level displacement shifters with each output signal of level shift shift register it is provided to each sweep trace.
The beginning pulse of next stage is delayed to be provided to comprise digestion period afterwards scan period.
Each grade provides the output signal corresponding to first voltage of the beginning pulse of displacement, and it further provides the output signal of second voltage.
When each level displacement shifter provides the output signal of first voltage, each level displacement shifter is selected low scanning voltage, and when when each level displacement shifter provides the output signal of second voltage, each level displacement shifter is selected the first high scanning voltage in the scan period, and selects the second high scanning voltage to provide selected voltage to corresponding sweep trace in digestion period.
Each of low scanning voltage, the first and second high scanning voltages is provided to each level displacement shifter.
Each of the low scanning voltage and the second high scanning voltage is added to each level displacement shifter, and the second high scanning voltage that provides was provided in digestion period each level displacement shifter, and in the scan period voltage of the second high scanning voltage was dropped to the first high scanning voltage to use.
Equipment according to driving electroluminescence display panel of the present invention comprises: data driver, and it provides the data-signal data line that suspends to data line and in digestion period in the scan period; Scanner driver, it provides scanning impulse to make that to sweep trace and in digestion period adjacent sweep trace has different voltages in the scan period; And electroluminescence display panel, it has the electroluminescence cell that forms in each point of crossing of sweep trace and data line, wherein carries out in electroluminescence cell from aging according to the data signal transmission electroluminescence cell and in digestion period in the scan period.
Scanner driver is used in digestion period and the opposite aging voltage of aging voltage of adjacent scanning lines.
In digestion period, scanner driver is added to the even-line interlace line with any one aging voltage of high and low aging voltage, and the aging voltage opposite with the aging voltage of even-line interlace line is added to odd-numbered scan lines.
In digestion period, the aging voltage that scanner driver will be added to a plurality of sweep traces oppositely at least once.
Scanner driver will be divided into a plurality of cycles digestion period, and it is reverse to be added to the aging voltage of each sweep trace for each frontier point in the cycle of dividing.
Scanner driver will be added to each sweep trace in the cycle of dividing aging voltage at least more oppositely once.
In the scan period, scanner driver is added to sweep trace with low scanning ground voltage and is used to enable, and the first high scanning voltage is provided to sweep trace is used for forbidding, and wherein in digestion period, scanner driver provides the second high scanning voltage more than or equal to the first high scanning voltage as high aging voltage, and provides low scanning voltage as low aging voltage.
Scanner driver is for each frame multiple scanning cycle and digestion period.
This scanner driver comprises: shift register, and it has multistage will begin the pulse displacement so that its beginning pulse and a plurality of pseudo-level as each output signal and next stage to be provided, and the output signal of last level is to guarantee digestion period in a plurality of levels of its displacement; With the level displacement shifter part, it has a plurality of level displacement shifters each output signal with the level shift shift register, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide the aging voltage opposite with the aging voltage of adjacent scanning lines.
Scanner driver comprises: shift register, and it has multistage will begin the pulse displacement so that its beginning pulse as each output signal and next stage to be provided; With the level displacement shifter part, it has a plurality of level displacement shifters each output signal with the level shift shift register, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide the aging voltage opposite with the aging voltage of adjacent scanning lines.
The beginning pulse of next stage is delayed to be provided to comprise digestion period afterwards scan period.
Each grade provides the signal of enabling corresponding to the beginning pulse of displacement, and wherein when signal is enabled in output in each pseudo-level, the level displacement shifter part will be divided into a plurality of cycles digestion period, and oppositely be added to the aging voltage of each sweep trace for each frontier point in the cycle of dividing.
Level displacement shifter part will be added to each sweep trace in the cycle of dividing aging voltage at least more oppositely once.
Equipment according to driving electroluminescence display panel of the present invention comprises: data driver, and it provides the data-signal data line that suspends to data line and in digestion period in the scan period; Scanner driver, it provides scanning impulse to make that to sweep trace and in digestion period adjacent sweep trace has the voltage with multiple levels difference in the scan period; And electroluminescence display panel, it has the electroluminescence cell that forms in each point of crossing of sweep trace and data line, wherein carries out in electroluminescence cell from aging according to the data signal transmission electroluminescence cell and in digestion period in the scan period.
In digestion period, scanner driver will be added to adjacent sweep trace with many level aging voltage that reciprocal order changes.
Scanner driver further comprises the neutralization stage when identical aging voltage is added to adjacent scanning lines.
In digestion period, scanner driver will be wherein the many level aging voltage that increases in proper order or reduce of the voltage difference between odd-numbered scan lines and even-line interlace line be added to sweep trace.
In digestion period, scanner driver many level aging voltage that wherein voltage difference between odd-numbered scan lines and even-line interlace line increases in proper order and reduces afterwards or order reduces and increases afterwards is added to sweep trace.
In digestion period, the aging voltage that scanner driver will be changed into many level is added to odd-numbered scan lines, and the aging voltage that will change with the order opposite with the aging voltage of odd-numbered scan lines is added to the even-line interlace line.
In digestion period, many level aging voltage that scanner driver will increase in proper order is added to any one of odd-numbered scan lines and even-line interlace line, and many level aging voltage that will reduce in proper order is added to remaining sweep trace.
In digestion period, many level aging voltage that scanner driver increases order and reduce afterwards is added to any one of odd-numbered scan lines and even-line interlace line, and many level aging voltage that will reduce in proper order and increase afterwards is added to remaining sweep trace.
In digestion period, many level aging voltage that scanner driver will increase in proper order or reduce is added to any one of odd-numbered scan lines and even-line interlace line, and stop voltage is added to remaining sweep trace.
In digestion period, many level aging voltage that scanner driver will order increases and reduces afterwards or order reduces and increases afterwards is added to any one of odd-numbered scan lines and even-line interlace line, and stop voltage is added to remaining sweep trace.
The stop voltage that applies in digestion period is consistent with the voltage of the minimum aging voltage of many level aging voltage.
The stop voltage that applies in digestion period is with to be provided to the low scanning voltage of sweep trace consistent as enabling voltage in the scan period.
This scanner driver further comprises neutralization stage, wherein identical aging voltage is added to the odd and even number sweep trace.
In neutralization stage, scanner driver is added to the odd and even number sweep trace with the identical medium voltage of many level aging voltage.
In the scan period, scanner driver provides the voltage between the highest aging voltage and minimum aging voltage wherein to be divided into many level aging voltage of many level, here the highest aging voltage is greater than being provided to the high scanning voltage of sweep trace or equaling high scanning voltage as forbidding voltage, and minimum aging voltage equals as enabling the low scanning voltage that voltage provides.
Scanner driver repeats many level aging voltage so that this many level aging voltage to be provided in digestion period.
Scanner driver is for each frame multiple scanning cycle and digestion period.
Scanner driver comprises: shift register, and it has multistage will begin the pulse displacement so that its beginning pulse and a plurality of pseudo-level as each output signal and next stage to be provided, and the output signal of last level is to guarantee digestion period in a plurality of levels of its displacement; With the level displacement shifter part, it has a plurality of level displacement shifters each output signal with this shift register of level shift, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide many level aging voltage to adjacent sweep trace to have the voltage with multiple levels difference.
Scanner driver comprises: shift register, and it has multistage will begin the pulse displacement so that its beginning pulse as each output signal and next stage to be provided; With the level displacement shifter part, it has a plurality of level displacement shifters each output signal with this shift register of level shift, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide many level aging voltage to adjacent sweep trace to have the voltage with multiple levels difference.
The beginning pulse of next stage is delayed to be provided to comprise digestion period afterwards scan period.
Each grade provides the signal of enabling corresponding to the beginning pulse of displacement, and level displacement shifter part digestion period and when the cycle of exporting in each pseudo-level when enabling signal, to change many level aging voltage synchronously wherein.
Equipment according to driving electroluminescence display panel of the present invention comprises: electroluminescence display panel, and its point of crossing at sweep trace and data line has electroluminescence cell; Scanner driver, it provides scanning impulse to sweep trace during the scan period, and this sweep trace that suspends during the digestion period after the scan period; And data driver, it provides data-signal to data line during the scan period; Provide device with aging voltage, it provides the voltage that differs from one another to adjacent data line during digestion period, to carry out in organic EL display panel from aging.
This equipment further comprises and data line connects and be connected data driver and aging voltage provides switch between the device, is provided to the data-signal and the aging voltage of data line with switching.
Aging voltage is following any one: first voltage that is provided to the I sub-pixel; Be provided to the sub-pixel adjacent and be different from second voltage of first voltage with the I sub-pixel; With the tertiary voltage that forms by the suspension data line.
Repeat to apply aging voltage for each pixel that comprises each sub-pixel.
Description of drawings
Can know these and other aspect of the present invention more by detailed description below with reference to the embodiment of the invention of accompanying drawing.Wherein:
Fig. 1 is the circuit diagram that equivalence shows the passive matrix type organic EL display apparatus of prior art;
Fig. 2 is the drive waveforms figure of EL panel as shown in Figure 1;
Fig. 3 is the drive waveforms figure that is used to describe according to the method for driving organic EL display panel of the present invention;
Fig. 4 shows the block diagram according to the equipment of the driving organic EL display panel of first embodiment of the invention;
Fig. 5 is the drive waveforms of the equipment of driving organic EL display panel as shown in Figure 4;
Fig. 6 shows the block diagram according to the equipment of the driving organic EL display panel of second embodiment of the invention;
Fig. 7 is the drive waveforms of the equipment of driving organic EL display panel as shown in Figure 6;
Fig. 8 is the drive waveforms figure that is used to describe according to the method for driving organic EL display panel of the present invention;
Fig. 9 shows the block diagram according to the equipment of the driving organic EL display panel of third embodiment of the invention;
Figure 10 is the drive waveforms of the equipment of driving organic EL display panel as shown in Figure 9;
Figure 11 is as shown in Figure 9 the drive waveforms of scanner driver in digestion period;
Figure 12 is as shown in Figure 9 another drive waveforms of scanner driver in digestion period;
Figure 13 shows the block diagram according to the equipment of the driving organic EL display panel of fourth embodiment of the invention;
Figure 14 is the drive waveforms of the equipment of driving organic EL display panel as shown in figure 13;
Figure 15 is the drive waveforms figure that is used to describe according to the method for driving organic EL display panel of the present invention;
Figure 16 is another turntable driving oscillogram in digestion period of the present invention;
Figure 17 A and 17B are another turntable driving oscillograms in digestion period of the present invention;
Figure 18 A and 18B are one scan drive waveforms figure again in digestion period of the present invention;
Figure 19 shows the block diagram according to the equipment of the driving organic EL display panel of fifth embodiment of the invention;
Figure 20 is the drive waveforms of the equipment of driving organic EL display panel as shown in figure 19;
Figure 21 shows the block diagram according to the equipment of the driving organic EL display panel of sixth embodiment of the invention;
Figure 22 is the drive waveforms of the equipment of driving organic EL display panel as shown in figure 21;
Figure 23 is the drive waveforms figure that is used to describe according to the method for the driving organic EL display panel of seventh embodiment of the invention;
Figure 24 shows the view that is provided to the voltage status of each data line in the digestion period of seventh embodiment of the invention;
Figure 25 shows the block diagram according to the equipment of the driving organic EL display panel of seventh embodiment of the invention.
Embodiment
Below will be in detail with reference to the preferred embodiments of the present invention, the example shown in the drawings.
Hereinafter, will describe the preferred embodiments of the present invention in detail referring to figs. 3 to 25.
Fig. 3 is according to the sweep trace of the method for driving organic EL display panel of the present invention and the drive waveforms figure of data line.
According to the digestion period of the method for the driving organic EL display panel of the embodiment of the invention among the APD, with high voltage, just the second high scanning voltage Vhigh2 is provided to n sweep trace SL1-SLn, and with low-voltage, just, ground voltage GND is provided to m data line DL1-DLm.Under this situation, in order to improve ageing efficiency, high scanning voltage Vhigh2 is the voltage greater than the first high scanning voltage Vhigh1 that provides in light period LPD.For example, the second high scanning voltage Vhigh2 is set to than the first high scanning voltage Vhigh1 larger about 10% to 20% voltage.
As mentioned above, in the method that drives organic EL display panel according to an embodiment of the invention, guarantee to make whole EL unit be in APD digestion period of reverse-bias state, when driving, carry out the aging of EL panel thus.Therefore, can prolong life-span of EL panel and prevent shortcoming such as the capable defective that causes by tension force.
Fig. 4 shows the block diagram according to the equipment of the driving organic EL display panel of first embodiment of the invention, and Fig. 5 is the drive waveforms of the equipment of driving organic EL display panel as shown in Figure 4.
The equipment of driving organic EL display panel as shown in Figure 4 comprises: EL panel 30, and it has the EL unit 36 that forms in the point of crossing of sweep trace SL1 to SLn and data line DL1 to DLm; Scanner driver 32, it is used for driven sweep line SL1-SLn; With data driver 34, it is used for driving data lines DL1-DLm.
As shown in Figure 5, scanner driver 32 will hang down scanning voltage Vlow and be provided to n sweep trace SL1-SLn in proper order in the scan period of frame Fi SPD, and high scanning voltage Vhigh is provided in rest period.In addition, scanner driver 32 provides the second high scanning voltage Vhigh2 greater than the first high scanning voltage Vhigh1 to arrive all n sweep trace SL1-SLn in the digestion period of a frame Fi.
For this reason, scanner driver 32 comprises: shift register 40, and it is at order displacement n output signal S1-Sn of output during by the beginning pulse Vst of frame Fi unit input, and makes assurance APD digestion period; With level displacement shifter part 42, each output signal S1-Sn of this shift register 40 of its level shift is to be supplied to each sweep trace SL1-SLn.
Shift register 40 comprises: ST1 is to STn for the n level, and it is used for n the output signal S1-Sn of time output that remove initial pulse on the throne; With k pseudo-level DST1-DSTk, it makes and guarantee APD digestion period when the output signal Sn of displacement n level STn.
ST1-STn and k pseudo-level DST1-DSTk of n level are connected in series to the incoming line that begins pulse Vst, and it is connected to the incoming line of clock signal clk jointly.First to n level ST1-STn according to clock signal clk displacement sequentially beginning pulse Vst to export first to n output signal S1-Sn to level displacement shifter part 42, as shown in Figure 5.In this situation, each output signal S1-Sn of the ST1-STn of n level is provided to the incoming line of the beginning pulse of next stage.K pseudo-level DST1-DSTk is according to the clock signal clk output signal Sn of displacement n level STn sequentially.Each output signal DS1-DSk of K pseudo-level DST1-DSTk is not output to level displacement shifter part 42, and it is provided to the incoming line of the beginning pulse of next pseudo-level.Therefore, as shown in Figure 5, as pseudo-level DSTI-DSTk sequentially during the output signal DS1-DSk of output LOW voltage, each frame Fi guarantees that pseudoperiod is as digestion period, and when the output signal S1-Sn of first to the n level ST1-STn output LOW voltage and scan period SPD separately.In digestion period, whole first the output signal S1-Sn to n level ST1-STn output HIGH voltage.
Level displacement shifter part 42 comprises n level displacement shifter LS1-LSn, and it is connected between the ST1-STn and n sweep trace SL1-SLn of n level.If as shown in Figure 5, the output signal S1-Sn of low-voltage is provided to level displacement shifter LS1-LSn from shift register 40 in scan period SPD, level displacement shifter LS1-LSn selects low scanning voltage Vlow so, yet, if provide high-tension output signal S1 to Sn from shift register 40 to level displacement shifter LS1-LSn in scan period SPD, level displacement shifter LS1-LSn selects the first high scanning voltage Vhigh1 so.Therefore, level displacement shifter LS1-LSn provides selected voltage to each sweep trace SL1-SLn.In addition, if as shown in Figure 5, provide high-tension output signal S1-Sn from shift register 40 to level displacement shifter LS1-LSn in digestion period among the APD, so whole level displacement shifter LS1-LSn selects the second high scanning voltage Vhigh2 to provide the selected second high scanning voltage Vhigh2 to each sweep trace SL1-SLn.
Arrive this, as shown in Figure 4, produce the first and second high scanning voltage Vhigh1 and Vhigh2 and low scanning voltage Vlow together at power supply respectively, and the power lead through differing from one another is imported into level displacement shifter part 42 afterwards.Under this situation, each level displacement shifter LS1-LSn selects any one of low scanning voltage Vlow and high scanning voltage Vhigh1 and Vhigh2 according to the sweep trace SL1-SLn of shift register 40, to export selected voltage, and according to scan period SPD and digestion period APD select any one of low scanning voltage Vlow and high scanning voltage Vhigh1 and Vhigh2, to export selected voltage.
Be different from this, in power supply, produce the second high scanning voltage Vhigh2 and low scanning voltage Vlow respectively, and be imported into level displacement shifter part 42 afterwards.Under this situation, each level displacement shifter LS1-LSn selects high scanning voltage Vhigh2 to export this high scanning voltage Vhigh2 in the situation of APD digestion period.Yet, in scan period SPD situation, help by resistance, the voltage of each level displacement shifter LS1-LSn drops to the first high scanning voltage Vhigh1 from the second high scanning voltage Vhigh2, and select the first high scanning voltage Vhigh1 and low scanning voltage Vlow afterwards any one with output.
When in scan period SPD, enabling sweep trace, provide data-signal to m data line DL1-DLm for each cycle data driver 34, and in digestion period APD, provide ground voltage, for example, ground voltage GND.
Each the EL unit 36 that forms in EL panel 30 is represented as diode, and it is connected between data line DL and the sweep trace SL in direction.Here, data line DL is that anode and sweep trace SL are negative electrode equivalently equivalently.Be provided to sweep trace SL and positive data-signal (electric current) is provided to data line DL if will hang down scanning voltage Vlow, forward voltage is added to each EL unit 36, each EL unit 36 is luminous to produce the light corresponding to data-signal afterwards.On the other hand, if high scanning impulse Vhigh1 and Vhigh2 are provided to sweep trace SL thus reverse voltage is added to each EL unit 36, each EL unit 36 is not luminous so.Especially, if in digestion period the second high scanning voltage is provided to whole sweep trace SL1-SLn, and low-voltage is provided to whole data line DL1-DLm, each EL unit 36 is for the aging reverse-bias state that is in so.Therefore, can prolong the life-span of EL panel 30 and prevent such as the row defective shortcoming.
Fig. 6 shows the block diagram according to the equipment of the driving organic EL display panel of second embodiment of the invention, and Fig. 7 is the drive waveforms of the equipment of driving organic EL display panel as shown in Figure 6.
The equipment of driving organic EL display panel as shown in Figure 6 has the identical element of equipment with as shown in Figure 4 driving organic EL display panel, except the shift register 60 of scanner driver 52 only has n level ST1-STn and do not have pseudo-level DST.Therefore, omission is about the description of identical element.
Scanner driver 52 comprises: shift register 60, and it is n output signal S1-Sn of output when displacement sequentially is by the beginning pulse Vst of frame Fi unit input; With level displacement shifter part 62, each output signal S1-Sn of this shift register 60 of its level shift is to be supplied to each sweep trace SL1-SLn.
The n that comprises in shift register 60 level ST1-STn is according to clock signal clk displacement sequentially beginning pulse Vst, to export first to n output signal S1-Sn to level displacement shifter part 62, as shown in Figure 7.Output signal S1-Sn is provided to the incoming line of the beginning pulse of next stage respectively.Therefore, as shown in Figure 7, first to the n level ST1-STn output signal S1-Sn of output LOW voltage sequentially.For guaranteeing APD digestion period after scan period SPD, postpone in next frame Fi+1, to begin the time point that provides of pulse Vst.At APD digestion period, whole first the output signal S1-Sn to n level ST1-STn output HIGH voltage.
As shown in Figure 7, if in scan period SPD, provide the output signal S1-Sn of low-voltage to the n that level displacement shifter part 62, comprises a level displacement shifter LS1-LSn from shift register 60, level displacement shifter LS1-LSn selects low scanning voltage Vlow so, yet, if in scan period SPD, provide high-tension output signal S1-Sn from shift register 60 to level displacement shifter LS1-LSn, level displacement shifter LS1-LSn selects the first high scanning voltage Vhigh1 so.Therefore, level displacement shifter LS1-LSn provides selected voltage to each sweep trace SL1-SLn.In addition, as shown in Figure 7, if provide high-tension output signal S1-Sn from shift register 60 to level displacement shifter LS1-LSn in digestion period among the APD, so whole level displacement shifter LS1-LSn selects the second high scanning voltage Vhigh2 to provide the selected second high scanning voltage Vhigh2 to each sweep trace SL1-SLn.
Therefore, if among the APD the second high scanning voltage Vhigh2 is provided to whole sweep trace SL1-SLn in digestion period, and low-voltage is provided to whole data line DL1-DLm, each EL unit 36 becomes reverse-bias state so.Therefore, execution is aging in EL unit 36.Therefore, can prolong the life-span of EL panel 30 and prevent such as the row defective shortcoming.
Fig. 8 shows according to of the present invention according to the sweep trace of the method that drives organic EL display panel and the drive waveforms figure of data line.
The method that drives organic EL display panel according to an embodiment of the invention comprises APD digestion period that carries out when wearing out when in driving.For example, as shown in Figure 8, frame Fi comprises the scan period SPD that is used for row sequential firing EL unit and makes the voltage difference that passes through adjacent two sweep traces carry out from aging APD digestion period in the EL unit.Arrive this, the cycle of frame Fi increases with assurance APD digestion period and scan period SPD separates.
In a frame Fi, in scan period SPD, with negative scanning impulse, just, low scanning voltage Vlow sequentially is provided to n sweep trace SL1-SLn, and during rest period, provides the first high scanning voltage Vhigh1.In addition, when low scanning voltage Vlow is provided,, positive data signal (for example, electric current) is provided to m data line DL1-DLm for each cycle.Therefore, the EL unit that applies forward voltage by low scanning voltage Vlow and positive data-signal radiates, to produce the light corresponding to data-signal.On the other hand, light is not launched in the EL unit 36 that applies reverse voltage by the first high scanning voltage Vhigh1.
Digestion period after scan period SPD, each sweep trace SL1-SLn had the voltage difference with adjacent scanning lines among the APD, so that the EL unit is from aging.In other words, during digestion period APD, reciprocal aging voltage is added to odd-numbered scan lines and even-line interlace line, make odd-numbered scan lines and even-line interlace line have voltage difference each other, and data line DL1-DLm is in suspended state.Therefore, apply selectable voltage to each EL unit, make and in each EL unit, carry out from aging according to the state of EL unit.
For example, as shown in Figure 8, when data line DL1-DLm suspends, with the second high scanning voltage Vhigh (just, high aging voltage) be applied to odd-numbered scan lines SL1, SL3 ..., SLn-1, yet, will hang down scanning voltage Vlow, just, low aging voltage be applied to even-line interlace line SL2, SL2 ..., SLn.Perhaps, will hang down scanning voltage Vlow be applied to odd-numbered scan lines SL1, SL3 ..., SLn-1, and with the second high scanning voltage Vhigh2 be applied to even-line interlace line SL2, SL2 ..., SLn.Therefore, by carrying out in the EL unit at the voltage difference between the adjacent scanning lines from aging.Here, the second high scanning voltage Vhigh2 (just, high aging voltage) is set to larger than the first high scanning voltage Vhigh1 that applies in scan period SPD, or equals the first high scanning voltage Vhigh1.For example, the second high scanning voltage Vhigh2 is set to the voltage larger about 10%-20% than the first high scanning voltage Vhigh1.
In addition, in order to improve ageing efficiency, the aging voltage that is provided to each sweep trace SL1-SLn in identical digestion period among the APD is set to oppositely at least once.
For example, as shown in Figure 8, APD is divided into first and second cycle A1 and the A2 with digestion period.When the second high scanning voltage Vhigh2 is added to odd-numbered scan lines SL1, SL3 ..., SLn-1, and will hang down scanning voltage Vlow be applied to even-line interlace line SL2, SL2 ..., during SLn, during period 1 A1, voltage reversal during second round A2, with will hang down scanning voltage be added to odd-numbered scan lines SL1, SL3 ..., SLn-1, and with the second high scanning voltage Vhigh2 be added to even-line interlace line SL2, SL2 ..., SLn.
As mentioned above, the method that drives organic EL display panel has according to an embodiment of the invention guaranteed APD digestion period when carrying out when aging in whole EL unit in a frame Fi, so that can carry out the aging certainly of EL panel when driving.Therefore, can prolong the life-span and the shortcoming that prevents to cause of EL panel such as the row defective by tension force.
Fig. 9 shows the block diagram according to the equipment of the driving organic EL display panel of third embodiment of the invention, Figure 10 is the drive waveforms of the equipment of driving organic EL display panel as shown in Figure 9, and Figure 11 and 12 is as shown in Figure 9 drive waveforms of scanner driver in digestion period APD.
The equipment of driving organic EL display panel as shown in Figure 9 comprises: EL panel 130, and it has the EL unit 136 that forms in the point of crossing of sweep trace SL1-SLn and data line DL1-DLm; Scanner driver 132, it is used for driven sweep line SL1-SLn; With data driver 134, it is used for driving data lines DL1-DLm.
Each the EL unit 136 that forms in EL panel 130 is represented as diode, and it is connected between data line DL and the sweep trace SL in direction.Here, data line DL is anode equivalently, and sweep trace SL is negative electrode equivalently.If will hang down scanning voltage Vlow is provided to sweep trace SL and positive data-signal (electric current) is provided to data line DL, in scan period SPD forward voltage is added to each EL unit 136, each EL unit 136 is luminous to produce the light corresponding to data-signal then.On the other hand, if the first high scanning impulse Vhigh1 is provided to sweep trace SL thus reverse voltage is added to each EL unit 136, each EL unit 36 is not luminous so.In addition, as fruit suspension data line DL1-DLm, and in digestion period APD, with reciprocal voltage be added to odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., SLn, each EL unit 136 is not luminous so, and carries out in each EL unit 136 from aging.
When enabling sweep trace SL1-SLn during scan period SPD, for each cycle, data driver 134 provides data-signal to m data line DL1-DLm, and data driver 124 suspension data line DL1-DLm during digestion period APD.
As shown in figure 10, scanner driver 132 sequentially provides low scanning voltage Vlow to n sweep trace SL1-SLn in the scan period of frame Fi SPD, and high scanning voltage Vhigh was provided in the remaining cycle.In addition, scanner driver 132 in the digestion period of frame Fi APD, provide reciprocal aging voltage to odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., SLn.
For this reason, scanner driver 132 comprises: shift register 140, and it is at n the output signal S1-Sn of output during by the beginning pulse Vst of frame Fi unit input of displacement sequentially, and makes assurance APD digestion period; With level displacement shifter part 142, each output signal S1-Sn of this shift register 140 of its level shift is to be supplied to each sweep trace SL1-SLn.
Shift register 140 comprises: n level ST1-STn, and it is used for n the output signal S1-Sn of time output that remove initial pulse on the throne; With k pseudo-level DST1-DSTk, it makes and guarantee APD digestion period when the output signal Sn of displacement n level STn.
N level ST1-STn and k pseudo-level DST1-DSTk are connected in series to the incoming line that begins pulse Vst, and it is connected to the incoming line of clock signal clk jointly.First to n level ST1-STn according to clock signal clk displacement sequentially beginning pulse Vst to export first to n output signal S1-Sn to level displacement shifter part 142, as shown in figure 10.Under this situation, each output signal S1-Sn of n level ST1-STn is provided to the incoming line of the beginning pulse of next stage.And K pseudo-level DST1-DSTk is according to the clock signal clk output signal Sn of displacement n level STn sequentially.Each output signal DS1-DSk of K pseudo-level DST1-DSTk is not output to level displacement shifter part 142, and it is provided to the incoming line of the beginning pulse of next pseudo-level.Therefore, as shown in figure 10, when the output signal DS1-DSk of pseudo-level DST1-DSTk order output LOW voltage, each frame Fi guarantees that pseudoperiod is as digestion period, when the output signal S1-Sn of first to the n level ST1-STn output LOW voltage, itself and scan period SPD are separately.During digestion period APD, whole first the output signal S1-Sn to n level ST1-STn output HIGH voltage.
Level displacement shifter part 142 comprises n level displacement shifter LS1-LSn, and it is connected between n level ST1-STn and n the sweep trace SL1-SLn.If as shown in figure 10, in scan period SPD, provide low-voltage to level displacement shifter LS1-LSn from shift register 140, just, output signal S1-Sn enables voltage, level displacement shifter LS1-LSn selects low scanning voltage Vlow so, yet, if in scan period SPD, provide high-tension output signal S1-Sn from shift register 140 to level displacement shifter LS1-LSn, level displacement shifter LS1-LSn selects the first high scanning voltage Vhigh1 so.Therefore, level displacement shifter LS1-LSn provides selected voltage to each sweep trace SL1-SLn.In addition, as shown in figure 10, if provide high-tension output signal S1-Sn from shift register 140 to level displacement shifter LS1-LSn among the APD in digestion period, so whole level displacement shifter LS1-LSn by use the second high scanning voltage Vhigh2 and low scanning voltage Vlow provide reciprocal voltage to odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., SLn.Perhaps, in order to improve ageing efficiency, in digestion period APD, odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., voltage reversal is set at least once among the SLn.
For example, during the period 1 A1 of APD digestion period, when the second high scanning voltage Vhigh2 is added to odd-numbered scan lines SL1, SL3 ..., SLn-1, and will hang down scanning voltage Vlow be added to even-line interlace line SL2, SL4 ..., during SLn, voltage reversal during second round A2, with will hang down scanning voltage Vlow be added to odd-numbered scan lines SL1, SL3 ..., SLn-1 and with the second high scanning voltage Vhigh2 be added to even-line interlace line SL2, SL4 ..., SLn.
Be different from this, as shown in figure 11, APD is divided into first to the k cycle A1-Ak with digestion period, when the pseudo-level DST1-DSTk of shift register 140 output LOW voltage sequentially, just, when enabling voltage.Be added to odd-numbered scan lines SL1, SL3 ..., SLn-1 (Slodd) and even-line interlace line SL2, SL4 ..., opposite voltage Vhigh2 and the Vlow of SLn (Sleven) be set at for each frontier point of first to the k cycle A1-Ak reverse.
Perhaps, as shown in figure 12, be added to odd-numbered scan lines SL1, SL3 ..., SLn-1 (Slodd) and even-line interlace line SL2, SL4 ..., opposite voltage Vhigh2 and the Vlow of SLn (Sleven) be set at first to the k cycle A1-Ak more oppositely once.In other words, the reversal periods that is added to the aging voltage of odd-numbered scan lines SLodd and even-line interlace line SLeven be set to equal APD digestion period each divide cycle Ai.
For this reason, as shown in Figure 9, produce first and second high scanning voltage Vhigh1 and the Vhigh2 together at power supply, and afterwards with its power lead incoming level shifter part 142 through differing from one another.Be different from this, produce the second high scanning voltage Vhigh2 and low scanning voltage Vlow respectively at power supply, and can be imported into level displacement shifter part 142 afterwards.Under the situation of digestion period, in fact level displacement shifter part 142 uses the second high scanning voltage Vhigh2, yet under the situation of scan period SPD, the help of level displacement shifter 142 by resistance drops to the first high scanning voltage Vhigh1 with the voltage of the second high scanning voltage Vhigh2, uses it then.
Figure 13 shows the block diagram according to the equipment of the driving organic EL display panel of fourth embodiment of the invention, and Figure 14 is the drive waveforms of the equipment of driving organic EL display panel as shown in figure 13.
The equipment of driving organic EL display panel as shown in figure 13 has the identical element of equipment with as shown in Figure 9 driving organic EL display panel, except the shift register 160 of scanner driver 152 only has n level ST1-STn and do not have the pseudo-level DST.Therefore, omission is about the description of identical element.
Scanner driver 152 comprises: shift register 160, and it is n output signal S1-Sn of output when displacement sequentially is by the beginning pulse Vst of frame Fi unit input; With level displacement shifter part 162, each output signal S1-Sn of this shift register 160 of its level shift is to be supplied to each sweep trace SL1-SLn.
The n that in shift register 160, comprises the level ST1-STn according to clock signal clk displacement sequentially beginning pulse Vst, with export first to n output signal S1-Sn to level displacement shifter part 162, as shown in figure 14.Output signal S1-Sn is provided to the incoming line of the beginning pulse of next stage respectively.Therefore, as shown in figure 14, first to the n level ST1-STn output signal S1-Sn of output LOW voltage sequentially.For guaranteeing APD digestion period after scan period SPD, postpone in next frame Fi+1, to begin the time point that provides of pulse Vst.During digestion period APD, whole first the output signal S1-Sn to n level ST1-STn output HIGH voltage.
As shown in figure 14, if in level displacement shifter part 162, comprise n level displacement shifter LS1-LSn, the output signal S1-Sn of low-voltage is provided to n level displacement shifter LS1-LSn from shift register 160 in scan period SPD, level displacement shifter LS1-LSn selects low scanning voltage Vlow so, yet, if in scan period SPD, provide high-tension output signal S1-Sn from shift register 160 to level displacement shifter LS1-LSn, level displacement shifter LS1-LSn selects the first high scanning voltage Vhigh1 so.Therefore, level displacement shifter LS1-LSn provides selected voltage to each sweep trace SL1-SLn.In addition, if as shown in figure 14, provide high-tension output signal S1-Sn from shift register 160 to level displacement shifter LS1-LSn in digestion period among the APD, so whole level displacement shifter LS1-LSn by use the second high scanning voltage Vhigh2 and low scanning voltage Vlow provide reciprocal voltage to odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., SLn.Perhaps, in order to improve ageing efficiency, in digestion period APD, odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., voltage reversal is set at least once among the SLn.
For example, during the period 1 A1 of APD digestion period, when the second high scanning voltage Vhigh2 is added to odd-numbered scan lines SL1, SL3 ..., SLn-1 and will hang down scanning voltage Vlow be added to even-line interlace line SL2, SL4 ..., during SLn, as shown in figure 14, voltage reversal during second round A2, with will hang down scanning voltage Vlow be added to odd-numbered scan lines SL1, SL3 ..., SLn-1, and with the second high scanning voltage Vhigh2 be added to even-line interlace line SL2, SL4 ..., SLn.
Therefore, in digestion period APD, when the suspension data line, produce voltage difference by the opposite voltage between adjacent scanning lines.As a result, in whole EL unit 136, carry out from aging.Therefore, can prolong the life-span of EL panel and prevent such as the row defective shortcoming.
Figure 15 is according to the sweep trace of the method that drives organic EL display panel and the drive waveforms figure of data line according to of the present invention.
The method that drives organic EL display panel according to an embodiment of the invention comprises APD digestion period that carries out when wearing out in the EL panel when in driving.For example, as shown in figure 15, frame Fi comprises that being used for row sequentially launches the scan period SPD of EL unit and make the voltage difference that passes through adjacent two sweep traces carry out from aging APD digestion period in the EL unit.Arrive this, the cycle of frame Fi is increased, and separates with assurance APD digestion period and scan period SPD.
In a frame Fi, during scan period SPD, with negative scanning impulse, just, low scanning voltage Vlow sequentially is provided to n sweep trace SL1-SLn, and during rest period, provides the first high scanning voltage Vhigh1.In addition, when being provided, low scanning voltage Vlow, whole data-signal (for example, electric current) is provided to m data line DL1-DLm for each cycle.Therefore, the EL unit that applies forward voltage by low scanning voltage Vlow and positive data-signal is launched, to produce the light corresponding to data-signal.On the other hand, light is not launched in the EL unit that applies reverse voltage by the first high scanning voltage Vhigh1.
Digestion period after scan period SPD is among the APD, as the whole data line DL1-DLm that suspends, each sweep trace SL1-SLn has the voltage difference with adjacent scanning lines, therefore, state according to the EL unit is added to the EL unit with selectable voltage, so that the EL unit is from aging.Especially, provide change into many level with odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., have the aging voltage of voltage difference between the SLn, to improve from ageing efficiency.As a result, the EL unit becomes more stable.
For example, as shown in figure 15, phase one from digestion period APD is to five-stage A1 to A5, the aging voltage that will change with the order of low scanning voltage Vlow, medium voltage Vmiddle, the second high scanning voltage Vhigh2, medium voltage Vmiddle and low scanning voltage Vlow be provided to odd-numbered scan lines SL1, SL3 ..., SLn-1.At this moment, the aging voltage that will change and odd-numbered scan lines SL1, SL3 with the order of the second high scanning voltage Vhigh2, medium voltage Vmiddle, low scanning voltage Vlow, medium voltage Vmiddle and the second high scanning voltage Vhigh2 ..., SLn-1 be provided on the contrary even-line interlace line SL2, SL4 ..., SLn.Here, the second high scanning voltage Vhigh2, just, the first high scanning voltage Vhigh1 that high aging voltage is set to larger than or equals to apply in scan period SPD.For example, the second high scanning voltage Vhigh2 is set to the voltage larger about 10%-20% than the first high scanning voltage Vhigh1.Suspension data line DL1-DLm in digestion period APD.
Therefore, in adjacent scanning lines, just, odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., the voltage difference between the SLn makes and carries out in the EL unit of the data line DL1-DLm with suspension from aging.In addition, digestion period APD comprise when odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., the voltage of SLn is in the neutralization procedure when identical with medium voltage Vmiddle.By neutralization procedure, can reduce the stray capacitance that in the EL panel, forms.
In addition, the drive waveforms that can be provided to sweep trace SL1-SLn among the APD in digestion period as Figure 16 to shown in the 18B.
With reference to Figure 16, in digestion period APD, the aging voltage AV1-Avi that changes into for first to 2i stage be provided to odd-numbered scan lines SL1, SL3 ..., SLn-1 (Slodd), and the aging voltage Avi-AV1 that will change into for first to 2i stage with the direction opposite with odd-numbered scan lines SLodd be provided to even-line interlace line SL2, SL4 ..., SLn (Sleven).
More specifically, from digestion period APD first to 2i stage A 1-A2i with AV1, AV2 ..., AVi-1 and AVi reduce in proper order, and afterwards once more with AVi-1 ..., the aging voltage that increases of the order of AV2 and AV1 is provided to even-line interlace line SLodd.On the other hand, will with AVi, AVi-1 ..., the order of AV2 and AV1 increases and afterwards with AV2 ..., the aging voltage that reduces of the order of AVi-1 and AVi is provided to even-line interlace line SLeven.Therefore, the voltage difference between odd and even number sweep trace Slodd and Sleven first is distinguished to 2i stage A 1-A2i for each.In other words, as shown in figure 16, voltage difference between odd and even number sweep trace SLodd and Sleven reduces to I stage A 1-Ai in proper order first, and sequentially increases to 2i stage A i+1-A2i at i+1, makes effectively to carry out from aging in the EL unit.Opposite with Figure 16 in addition, when many level aging voltage A1-Ai was provided to odd and even number sweep trace Slodd and Sleven, voltage difference between odd and even number sweep trace Slodd and Sleven and above-mentioned situation reverse order increased and reduce afterwards.Therefore, in the EL unit, effectively carry out from aging.
And in digestion period APD, odd and even number sweep trace Slodd and Sleven become in many level aging voltage AV1-AVi and medium voltage equates.Therefore, this APD cycle comprises that at least one neutralization stage is to reduce the stray capacitance in the EL panel.
And, many level aging voltage AV1-Avi is provided among odd and even number sweep trace Slodd and the Sleven any one, to shown in the 18B, and the residue sweep trace can be fixed to minimum aging voltage AV1 as Figure 17 A, just, low scanning voltage Vlow.
More specifically, even-line interlace line Sleven is fixed to low scanning voltage Vlow, and from first to 2i stage A 1-A2i, to odd-numbered scan lines SLodd provide with AV1, AV2 ..., AVi-1, AVi, AVi-1 ..., the aging voltage that changes in proper order of AV2 and AV1, shown in Figure 17 A.Perhaps, from first to 2i stage A 1-A2i, to odd-numbered scan lines SLodd provide with AVi, AVi-1 ..., AV2, AV1, AV2 ..., the aging voltage that changes in proper order of AVi-1 and AVi, shown in Figure 17 B.
On the other hand, the fixing low scanning voltage Vlow of odd-numbered scan lines SLodd, and from first to 2i stage A 1-A2i, to even-line interlace line SLeven provide with AV1, AV2 ..., AVi-1, AVi, AVi-1 ..., the aging voltage that changes in proper order of AV2 and AV1, shown in Figure 17 A.Perhaps, from first to 2i stage A 1-A2i, to even-line interlace line SLeven provide with AVi, AVi-1 ..., AV2, AV1, AV2 ..., the aging voltage that changes in proper order of AVi-1 and AVi, shown in Figure 17 B.
Therefore, the voltage difference between odd and even number sweep trace SLodd and Sleven first to 2i stage A 1-A2i is distinguished for each.In other words, shown in Figure 17 A and 18B, first in 2i stage A 1-A2i, the voltage difference between odd and even number sweep trace SLodd and Sleven reduces in proper order and increases afterwards, makes and effectively carries out from aging in the EL unit.On the other hand, shown in Figure 17 B and 18A, voltage difference between odd and even number sweep trace SLodd and Sleven and above-mentioned situation reverse order increase and reduce afterwards.Therefore, in the EL unit, effectively carry out from aging.
And in digestion period APD, odd and even number sweep trace SLodd and Sleven become and the minimum aging voltage AVi of many level aging voltage AV1-AVI, and just, low scanning voltage Vlow is identical.Therefore, this APD cycle comprises that at least one neutralization stage is to reduce the stray capacitance in the EL panel.
In addition, in digestion period of the present invention APD, can repeat above-mentioned first to the 2i stage.
As mentioned above, the method that drives organic EL display panel is according to an embodiment of the invention guaranteeing APD digestion period carrying out with many level during the frame Fi when aging in whole EL unit, make and can carry out the aging certainly of EL panel when driving.Therefore, can prolong the life-span of EL panel and prevent by tension force cause such as the row defective shortcoming.
Figure 19 shows the block diagram according to the equipment of the driving organic EL display panel of fifth embodiment of the invention, and Figure 20 is the drive waveforms of the equipment of driving organic EL display panel as shown in figure 19.
The equipment of driving organic EL display panel as shown in figure 19 comprises: EL panel 230, and it has the EL unit 236 that forms in the point of crossing of sweep trace SL1-SLn and data line DL1-DLm; Scanner driver 232, it is used for driven sweep line SL1-SLn and data driver 234, and it is used for driving data lines DL1-DLm.
Each the EL unit 236 that forms in EL panel 230 is represented as diode, and it is connected between data line DL and the sweep trace SL with direction.Here, data line DL is that anode and sweep trace SL are negative electrode equivalently equivalently.Be provided to sweep trace SL if will hang down scanning voltage Vlow, and positive data-signal (electric current) is provided to data line DL, in scan period SPD forward voltage is added to each EL unit 236, each EL unit 236 is luminous to produce the light corresponding to data-signal then.On the other hand, if high scanning voltage Vhigh1 is provided to sweep trace SL thus reverse voltage is added to each EL unit 236, each EL unit 236 is not luminous so.In addition, as fruit suspension data line DL1-DLm, and odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., produce the voltage difference of changing into many level among the SLn, each EL unit 236 is luminous and carry out autoluminescence in each EL unit 236 so.
When enabling sweep trace SL1 to SLn during the scan period SPD, provide data-signal to m data line DL1-DLm for each cycle data driver 234, and data driver 234 this data line DL1-DLm that during digestion period APD, suspends.
As shown in figure 20, scanner driver 232 sequentially provides low scanning voltage Vlow to n sweep trace SL1-SLn in the scan period of frame Fi SPD, and provides the first high scanning voltage Vhigh1 in rest period.In addition, scanner driver 232 provides the aging voltage of changing into many level in the digestion period of frame Fi APD so that odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., SLn has the voltage difference of many level.
For this reason, scanner driver 232 comprises: shift register 240, it is at order displacement n output signal S1-Sn of output during by the beginning pulse Vst of frame Fi unit input, and feasible assurance APD digestion period and level displacement shifter part 242, each output signal S1-Sn of this shift register 240 of its level shift is to be supplied to each sweep trace SL1-SLn.
Shift register 240 comprises: n level ST1-STn, and it is used for n the output signal S1-Sn of time output that remove initial pulse on the throne; With k pseudo-level DST1-DSTk, it makes and guarantee APD digestion period when the output signal Sn of displacement n level STn.
N level ST1-STn and k pseudo-level DST1-DSTk are connected in series to the incoming line that begins pulse Vst, and it is connected to the incoming line of clock signal clk jointly.First to n level ST1-STn according to clock signal clk displacement sequentially beginning pulse Vst to export first to n output signal S1-Sn to level displacement shifter part 242, as shown in figure 20.Under this situation, each output signal S1-Sn of n level ST1-STn is provided to the incoming line of the beginning pulse of next stage.K pseudo-level DST1-DSTk is according to the clock signal clk output signal Sn of displacement n level STn sequentially.Each output signal DS1-DSk of K pseudo-level DST1-DSTk is not output to level displacement shifter part 242, and it is provided to the incoming line of the beginning pulse of next pseudo-level.Therefore, as shown in figure 20, as pseudo-level DST1-DSTk sequentially during the output signal DS1-DSk of output LOW voltage, each frame Fi guarantees that pseudoperiod is as digestion period, as first the output signal S1-Sn to n level ST1-STn output LOW voltage, just, when enabling voltage, itself and scan period SPD are separately.During digestion period, whole first the output signal S1-Sn to n level ST1-STn output HIGH voltage.
Level displacement shifter part 242 comprises n level displacement shifter LS1-LSn, and it is connected between n level ST1-STn and n the sweep trace SL1-SLn.If as shown in figure 20, in scan period SPD, provide low-voltage from shift register 240 to level displacement shifter LS1-LSn, just, output signal S1-Sn enables voltage, level displacement shifter LS1-LSn selects low scanning voltage Vlow so, yet, if in scan period SPD, provide high voltage to level displacement shifter LS1-LSn, just from shift register 240, the output signal S1-Sn of forbidding voltage, level displacement shifter LS1-LSn selects the first high scanning voltage Vhigh1 so.Therefore, level displacement shifter LS1-LSn provides selected voltage to each sweep trace SL1-SLn.In addition, if as shown in figure 20, provide high-tension output signal S1-Sn from shift register 240 to level displacement shifter LS1-LSn in digestion period among the APD, aging voltage is provided to the so whole level displacement shifter LS1-LSn stage, its with to odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., direction that SLn is opposite changes.
For example, shown in Figure 15 and 20, from first to five-stage A1-A5, odd-numbered scan lines SL1, SL3 ..., aging voltage changes with the order of Vhigh2, Vmiddle, Vlow, Vmiddle and Vhigh2 among the SLn-1, and from first to five-stage A1-A5, even-line interlace line SL2, SL4 ..., among the SLn, aging voltage changes with the order of Vlow, Vmiddle, Vhigh2, Vmiddle and Vlow.Perhaps,, provide to shown in the 18B as Figure 16 from first the aging voltage to the 2i phasic change.
Arrive this, level displacement shifter part 242 is entirely imported many level aging voltage AV1-AVi to use them, perhaps only import the highest aging voltage AV1 and minimum aging voltage Avi, and divide the highest aging voltage AV1 to use this aging voltage by divider resistance afterwards.
In addition, in a plurality of stage A 1-Ai that divide APD digestion period, as described in Figure 20, APD is categorized as each pseudo-level DST1-DSTk output LOW voltage when shift register 240 with digestion period, just, and the cycle when enabling voltage.
Figure 21 shows the block diagram according to the equipment of the driving organic EL display panel of sixth embodiment of the invention, and Figure 22 is the drive waveforms of the equipment of driving organic EL display panel as shown in figure 21.
The equipment of driving organic EL display panel as shown in figure 21 has the identical element of equipment with as shown in figure 19 driving organic EL display panel, except the shift register 260 of scanner driver 252 only has n level ST1-STn and do not have pseudo-level DST.Therefore, omission is about the description of identical element.
Scanner driver 252 comprises: shift register 260, and it is n output signal S1-Sn of output when displacement sequentially is by the beginning pulse Vst of frame Fi unit input; With level displacement shifter part 262, each output signal S1-Sn of this shift register 260 of its level shift is to be supplied to each sweep trace SL1-SLn.
The n that in shift register 260, comprises the level ST1-STn according to clock signal clk displacement sequentially beginning pulse Vst, with export first to n output signal S1-Sn to level displacement shifter part 262, as shown in figure 22.Output signal S1-Sn is provided to the incoming line of the beginning pulse of next stage respectively.Therefore, as shown in figure 22, the output signal S1-Sn of first to the n level ST1-STn order output LOW voltage.For guaranteeing APD digestion period after scan period SPD, postpone in next frame Fi+1, to begin the time point that provides of pulse Vst.During digestion period APD, whole first the output signal S1-Sn to n level ST1-STn output HIGH voltage.
As shown in figure 22, if the n that comprises in level displacement shifter part 262 level displacement shifter LS1-LSn provides the output signal S1-Sn of low-voltage to n level displacement shifter LS1-LSn from shift register 260 in scan period SPD, level displacement shifter LS1-LSn selects low scanning voltage Vlow so, yet, if provide high-tension output signal S1-Sn from shift register 260 to level displacement shifter LS1-LSn in scan period SPD, level displacement shifter LS1-LSn selects the first high scanning voltage Vhigh1 so.Therefore, level displacement shifter LS1-LSn provides selected voltage to each sweep trace SL1-SLn.In addition, as shown in figure 22, if provide high-tension output signal S1-Sn from shift register 260 to level displacement shifter LS1-LSn among the APD in digestion period, aging voltage is provided to the so whole level displacement shifter LS1-LSn stage, its with to odd-numbered scan lines SL1, SL3 ..., SLn-1 and even-line interlace line SL2, SL4 ..., direction that SLn is opposite is changed.
For example, shown in Figure 16 and 22, from first to five-stage A1-A5, odd-numbered scan lines SL1, SL3 ..., aging voltage changes with the order of Vhigh2, Vmiddle, Vlow, Vmiddle and Vhigh2 among the SLn-1, and from first to five-stage A1-A5, even-line interlace line SL2, SL4 ..., among the SLn, aging voltage changes with the order of Vlow, Vmiddle, Vhigh2, Vmiddle and Vlow.Perhaps,, provide to shown in the 18B as Figure 16 from first the aging voltage to the 2i phasic change.
Therefore, in digestion period APD, when the suspension data line, between adjacent scanning lines, produce the voltage difference of many level.As a result, in whole EL unit 236, carry out from aging.Therefore, can prolong the life-span of EL panel 30 and prevent such as the row defective shortcoming.
Figure 23 is according to the sweep trace of the method for the driving organic EL display panel of seventh embodiment of the invention and the drive waveforms figure of data line.
Comprise as APD digestion period that when driving, in the EL panel, carries out when aging according to the method for the driving organic EL display panel of seventh embodiment of the invention.For example, as shown in figure 23, frame Fi comprises the scan period SPD that is used for row sequential firing EL unit and makes the voltage difference that passes through adjacent two sweep traces carry out from aging APD digestion period in the EL unit.Arrive this, the cycle of frame Fi is increased with assurance APD digestion period and scan period SPD separates.
In a frame Fi, during scan period SPD, with negative scanning impulse, just, low scanning voltage Vlow sequentially is provided to n sweep trace SL1-SLn, and during rest period, provides the first high scanning voltage Vhigh1.In addition, when being provided, low scanning voltage Vlow, whole data-signal (for example, electric current) is provided to m data line DL1-DLm for each cycle.Therefore, the EL unit that applies forward voltage by low scanning voltage Vlow and positive data-signal is launched, to produce the light corresponding to data-signal.On the other hand, light is not launched in the EL unit that applies reverse voltage by the first high scanning voltage Vhigh1.
Digestion period after scan period SPD is among the APD, when suspending whole data line DL1-DLm, each data line DL1-DLm has the voltage difference with adjacent data line, therefore, state according to the EL unit is added to the EL unit with selectable voltage, so that the EL unit is from aging.As a result, this EL unit becomes more stable.
For example, in digestion period APD, signal as shown in figure 24 can repeat to be added to data line DL1-DLm, and it connects each sub-pixel R, G and B.For specifically describing this example, high voltage Vhigh is added to the data line DL1 that connects the R sub-pixel, as as shown in first state, low-voltage Vlow is added to DL2 and the DL3 that is connected with G sub-pixel and B sub-pixel, and the voltage that first state applies is reapplied to other data line DL4-DLm.Therefore, each data line DL1-DLm has the voltage difference with adjacent data line.Therefore, the state according to EL is added to the EL unit with selectable voltage so that the EL unit is from aging.
In addition, shown in the tenth two-state, low-voltage Vlow is added to the data line DL1 that is connected with the R sub-pixel, and high voltage Vhigh is added to the data line DL2 that is connected with the G sub-pixel, and the data line DL3 that is connected with the B sub-pixel of suspension.Therefore, each data line DL1-DLm has the voltage difference with adjacent data line.Therefore, the state according to EL is added to the EL unit with selectable voltage so that the EL unit is from aging.
Therefore, in the method that drives organic EL display panel according to an embodiment of the invention, by with the relevant signal that is added to each sub-pixel R, G and B of using of three states of high voltage Vhigh, low-voltage Vlow and suspension.Therefore, each data line DL1-DLm has with the voltage difference of adjacent data line so that the EL unit is from aging.
As mentioned above, the method that drives organic EL display panel has according to an embodiment of the invention guaranteed as APD digestion period that carries out in whole EL unit in a frame when aging, so that can carry out the aging certainly of EL panel when driving.Therefore, can prolong the life-span of EL panel 30 and prevent such as the row defective shortcoming.
Figure 25 shows the block diagram according to the equipment of the driving organic EL display panel of seventh embodiment of the invention.
The equipment of driving organic EL display panel as shown in figure 25 comprises: EL panel 330, and it has the EL unit 336 that forms in the point of crossing of sweep trace SL1-SLn and data line DL1-DLm; Scanner driver 332, it is used for driven sweep line SL1-SLn; With data driver 334, it is used for driving data lines DL1-DLm; Aging voltage provides device 350, and it is used for the signal by using data line DL1-DLm to be provided for wearing out; With multiplexer MUX 340, it is used for switch data driver 334 and aging voltage provides device 350.
Each the EL unit 336 that forms in EL panel 330 is represented as diode, and it is being connected on direction between data line DL and the sweep trace SL.Here, data line DL equivalence is that anode and sweep trace SL equivalence are negative electrode.If will hang down scanning voltage Vlow in scan period SPD is added to sweep trace SL and positive data-signal (electric current) is offered data line DL, forward voltage is added to each EL unit 336, each EL unit 336 emission light is to produce the light corresponding to data-signal so.On the other hand, if high scanning voltage is provided to sweep trace SL thus reverse voltage is added to each EL unit 336, light is not launched in each EL unit 336 so.In addition, when suspension sweep trace SL1-SLn, voltage is added to each data line DL1-DLm makes each data line DL1-DLm and adjacent data line have voltage difference.Therefore, each EL unit 336 is not launched light and is carried out in EL unit 336 from aging.
In the scan period of frame Fi SPD, scanner driver 332 sequentially provides low scanning voltage Vlow to n sweep trace SL1-SLn, and high scanning voltage Vhigh is provided in rest period.
For each cycle, data driver 334 provides data-signal to m data line DL1-DLm when enabling sweep trace in scan period SPD.
Aging voltage provides device 350 to be created in the aging signal that is provided to data line DL1-DLm during digestion period.Here, by relevant with three kinds of states of high voltage Vhigh, low-voltage Vlow and suspension, aging signal can be repeated to be added to the data line DL1-DLm that is connected with B with each sub-pixel R, G.In addition,, can use aging signal and do not divide sub-pixel R, G and B, make each data line DL1-DLm have the voltage difference with adjacent data line by relevant with three kinds of states of high voltage Vhigh, low-voltage Vlow and suspension.
This MUX 340 provides the data-signal that provides from data driver 334 to each data line DL1-DLm, during scan period SPD, to realize picture thus, and providing from aging voltage provides aging signal that device 350 provides to each data line DL1-DLm, carries out in each EL unit from aging during the APD in digestion period to make thus.
, provide device 350, MUX 340 and data driver 334 by integrated aging voltage here, the equipment that drives organic EL display panel according to an embodiment of the invention can be integrated into a chip.
In the organic EL display panel that has said structure according to an embodiment of the invention, when data line DL1-DLm is suspended in digestion period APD, between adjacent scanning lines, produce the voltage difference of many level.As a result, in whole EL unit 336, carry out from aging.Therefore, can prolong the life-span of EL panel 330 and prevent such as the row defective shortcoming.
As mentioned above, in the method and apparatus that drives organic EL display panel according to an embodiment of the invention and the scan period separately guarantee to make whole EL unit be in the digestion period of reverse-bias state, when driving, carry out the aging of EL panel thus.Therefore, can prolong the life-span of EL panel 330 and prevent such as the row defective shortcoming.
In addition, in the method and apparatus that drives organic EL display panel according to an embodiment of the invention, guarantee when passing through in whole EL unit, to carry out the aging certainly cycle at the suspended state of voltage difference between the adjacent scanning lines and data line.Therefore, can when driving, carry out the aging of EL panel.
In addition, will in digestion period, be added to the height of adjacent scanning lines and low aging voltage on the contrary more oppositely once, to improve ageing efficiency thus.Therefore, can prolong the life-span of EL panel 330 and prevent such as the row defective shortcoming.
In addition, in the method and apparatus that drives organic EL display panel according to an embodiment of the invention, in frame and the scan period separately guarantee when by in whole EL unit, carries out the cycle when wearing out certainly at the suspended state of voltage difference between the adjacent scanning lines and data line.Therefore, can when driving, carry out the aging of EL panel.Therefore, can prolong the life-span of EL panel and prevent such as the row defective shortcoming.
Otherwise, in digestion period, comprise wherein identical voltage is added to adjacent scanning lines neutralization stage at least once.Therefore, can reduce stray capacitance in the EL panel.
In addition, in frame and the scan period separately guarantee when by in whole EL unit, carries out the digestion period when wearing out certainly at the suspended state of voltage difference between the adjacent scanning lines and data line.Therefore, can when driving, carry out the aging of EL panel.Therefore, can prolong the life-span of EL panel and prevent such as the row defective shortcoming.
Though explained the present invention by the embodiment shown in the aforesaid accompanying drawing, it should be understood by one skilled in the art that to the invention is not restricted to this embodiment, but under the situation that does not break away from spirit of the present invention, can make multiple modification or change.Therefore, scope of the present invention should only be determined by appended claim and equivalent thereof.

Claims (42)

1. method that drives electroluminescence display panel, it comprises:
When the scan period of the electroluminescence cell emission light time that forms from point of crossing at a plurality of sweep traces and a plurality of data lines; With
When suspending a plurality of data line, producing voltage difference between the adjacent scanning lines so that in electroluminescence cell, carry out digestion period when aging;
Wherein reciprocal aging voltage is applied to adjacent scanning lines in digestion period.
2. the method for claim 1, wherein in digestion period, any one aging voltage of high and low aging voltage is added to odd-numbered scan lines, and the aging voltage opposite with the aging voltage of odd-numbered scan lines is added to the even-line interlace line.
3. the method for claim 1, wherein this aging voltage that is added to a plurality of sweep traces was reversed at least once in digestion period.
4. method as claimed in claim 2, wherein, this aging voltage that is added to a plurality of sweep traces was reversed at least once in digestion period.
5. the method for claim 1, wherein be divided into a plurality of cycles this digestion period, and the aging voltage that is added to each sweep trace is reversed for the frontier point in each cycle that is divided.
6. method as claimed in claim 2, wherein, be divided into a plurality of cycles this digestion period, and the aging voltage that is added to each sweep trace is reversed for the frontier point in the cycle of each division.
7. method as claimed in claim 2 wherein, in the scan period, will be hanged down scanning voltage and be provided to sweep trace and be used to enable, and the first high scanning voltage is provided to sweep trace will be used for forbidding, and
Wherein in digestion period, will provide as high aging voltage, and will hang down scanning voltage and provide as low aging voltage more than or equal to the second high scanning voltage of the first high scanning voltage.
8. the method for claim 1, wherein should the scan period and be repeated for each frame digestion period.
9. method that drives electroluminescence display panel, it comprises:
When the scan period of the electroluminescence cell emission light time that forms from point of crossing at a plurality of sweep traces and a plurality of data lines; With
When suspending a plurality of data line in the voltage difference that produces many level between the adjacent scanning lines so that in electroluminescence cell, carry out digestion period when aging;
Wherein, the aging voltage that changes each other with reverse order is applied to adjacent scanning lines in digestion period.
10. method as claimed in claim 9 wherein, further comprises the neutralization stage when identical aging voltage is added to adjacent scanning lines this digestion period.
11. method as claimed in claim 9, wherein, in digestion period, many level aging voltage that the voltage difference between odd-numbered scan lines and even-line interlace line is wherein sequentially increased or reduces is added to sweep trace.
12. method as claimed in claim 9 wherein, in digestion period, sequentially increases the many level aging voltage that reduces then or sequentially reduce to increase then with the voltage difference between odd-numbered scan lines and even-line interlace line wherein and is added to sweep trace.
13. method as claimed in claim 9 wherein, in digestion period, is added to odd-numbered scan lines with the aging voltage of changing into many level, and the aging voltage that will change with the order opposite with the aging voltage of odd-numbered scan lines is added to the even-line interlace line.
14. method as claimed in claim 9 wherein, in digestion period, the many level aging voltage that sequentially increases is added to any one of odd-numbered scan lines and even-line interlace line, and many level aging voltage that will sequentially reduce is added to the residue sweep trace.
15. method as claimed in claim 9, wherein, in digestion period, the many level aging voltage that reduces after will be sequentially increasing is added to any one of odd-numbered scan lines and even-line interlace line, and will sequentially reduce and many level aging voltage of increasing afterwards is added to the residue sweep trace.
16. method as claimed in claim 9 wherein, in digestion period, is added to any one of odd-numbered scan lines and even-line interlace line with the many level aging voltage that sequentially increases or reduce, and stop voltage is added to remaining sweep trace.
17. method as claimed in claim 9, wherein, in digestion period, will sequentially increase and reduce afterwards or order reduces and many level aging voltage of increasing afterwards is added to any one of odd-numbered scan lines and even-line interlace line, and stop voltage is added to remaining sweep trace.
18. method as claimed in claim 11, wherein, this many level aging voltage is that wherein the voltage between the highest aging voltage and minimum aging voltage is divided into the voltage of many level, this the highest aging voltage is greater than being provided to the high scanning voltage of sweep trace or equaling high scanning voltage as forbidding voltage, and minimum aging voltage equals as enabling the low scanning voltage that voltage provides.
19. method as claimed in claim 13, wherein, this many level aging voltage is that wherein the voltage between the highest aging voltage and minimum aging voltage is divided into the voltage of many level, this the highest aging voltage is greater than being provided to the high scanning voltage of sweep trace or equaling high scanning voltage as forbidding voltage, and minimum aging voltage equals as enabling the low scanning voltage that voltage provides.
20. method as claimed in claim 11, wherein, this many level aging voltage was repeated in digestion period.
21. method as claimed in claim 13, wherein, this many level aging voltage was repeated in digestion period.
22. method as claimed in claim 9, wherein, this scan period and digestion period are repeated for each frame.
23. an equipment that drives electroluminescence display panel, it comprises:
Data driver, it provides data-signal to data line in the scan period, and the data line that suspends in digestion period;
Scanner driver, it provides scanning impulse to make that to sweep trace and in digestion period adjacent sweep trace has different voltages in the scan period; With
Electroluminescence display panel, it has the electroluminescence cell that forms in each point of crossing of sweep trace and data line, and wherein electroluminescence cell according to data signal transmission light, and was carried out in electroluminescence cell in digestion period from aging in the scan period;
Wherein scanner driver applies the aging voltage opposite with the voltage of adjacent scanning lines in digestion period.
24. equipment as claimed in claim 23, wherein, this scanner driver was added to odd-numbered scan lines with any one aging voltage of high and low aging voltage, and the aging voltage opposite with the aging voltage of odd-numbered scan lines is added to the even-line interlace line in digestion period.
25. equipment as claimed in claim 23, wherein, this scanner driver is for each frame multiple scanning cycle and digestion period.
26. equipment as claimed in claim 23, wherein, this scanner driver comprises:
Shift register, it has multistage will begin the pulse displacement so that its beginning pulse and a plurality of pseudo-level as each output signal and next stage to be provided, and the output signal of last level is to guarantee digestion period in a plurality of levels of its displacement; With
The level displacement shifter part, it has a plurality of level displacement shifters each output signal with this shift register of level shift, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide the aging voltage opposite with the aging voltage of adjacent scanning lines.
27. equipment as claimed in claim 23, wherein, this scanner driver comprises:
Shift register, it has multistage will begin the pulse displacement so that its beginning pulse as each output signal and next stage to be provided; With
The level displacement shifter part, it has a plurality of level displacement shifters each output signal with this shift register of level shift, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide the aging voltage opposite with the aging voltage of adjacent scanning lines.
28. equipment as claimed in claim 27, wherein, the beginning pulse of this next stage is delayed to be provided to comprise digestion period afterwards scan period.
29. the described equipment of claim 26, wherein, each grade provides the signal of enabling corresponding to the beginning pulse of displacement, and
Wherein when signal is enabled in output in each pseudo-level, the level displacement shifter part will be divided into a plurality of cycles digestion period, and oppositely be added to the aging voltage of each sweep trace for each frontier point in the cycle of dividing.
30. equipment as claimed in claim 23, wherein, this level displacement shifter part will be added to each sweep trace in the cycle of dividing aging voltage at least more oppositely once.
31. an equipment that drives electroluminescence display panel, it comprises:
Data driver, it provides data-signal to data line in the scan period, and the data line that suspends in digestion period;
Scanner driver, it provides scanning impulse to sweep trace in the scan period, and makes adjacent sweep trace have the voltage with multiple levels difference in digestion period; With
Electroluminescence display panel, it has the electroluminescence cell that forms in each point of crossing of sweep trace and data line, and wherein electroluminescence cell according to data signal transmission light, and was carried out in electroluminescence cell in digestion period from aging in the scan period;
Wherein, scanner driver will be applied to adjacent scanning lines with many level aging voltage that reverse order changes each other in digestion period.
32. equipment as claimed in claim 31, wherein, this scanner driver further comprises the neutralization stage when identical aging voltage is added to adjacent scanning lines.
33. equipment as claimed in claim 31, wherein, this scanner driver is in digestion period, and many level aging voltage that the voltage difference between odd-numbered scan lines and even-line interlace line is wherein sequentially increased or reduces is added to sweep trace.
34. equipment as claimed in claim 31, wherein, this scanner driver is added to sweep trace with many level aging voltage that wherein voltage difference between odd-numbered scan lines and even-line interlace line sequentially increases and reduces afterwards or order reduces and increases afterwards in digestion period.
35. equipment as claimed in claim 31, wherein, this scanner driver will be added to odd-numbered scan lines digestion period that change into many level in digestion period, and the aging voltage that will change with the order opposite with the aging voltage of odd-numbered scan lines is added to the even-line interlace line.
36. equipment as claimed in claim 31, wherein, this scanner driver is added to any one of odd-numbered scan lines and even-line interlace line with the many level aging voltage that sequentially increases in digestion period, and the many level aging voltage that will order reduces is added to remaining sweep trace.
37. equipment as claimed in claim 31, wherein, this scanner driver is in digestion period, the many level aging voltage that sequentially increases and reduce afterwards is added to any one of odd-numbered scan lines and even-line interlace line, and many level aging voltage that will sequentially reduce and increase afterwards is added to remaining sweep trace.
38. equipment as claimed in claim 31, wherein, this scanner driver is added to any one of odd-numbered scan lines and even-line interlace line with the many level aging voltage that sequentially increases or reduce in digestion period, and stop voltage is added to remaining sweep trace.
39. equipment as claimed in claim 31, wherein, this scanner driver is in digestion period, the many level aging voltage that sequentially increases and reduce afterwards or order reduces and increases afterwards is added to any one of odd-numbered scan lines and even-line interlace line, and stop voltage is added to remaining sweep trace.
40. equipment as claimed in claim 31, wherein, this scanner driver is for each frame multiple scanning cycle and digestion period.
41. equipment as claimed in claim 31, wherein, this scanner driver comprises:
Shift register, it has multistage will begin the pulse displacement so that its beginning pulse and a plurality of pseudo-level as each output signal and next stage to be provided, and the output signal of last level is to guarantee digestion period in a plurality of levels of its displacement; With
The level displacement shifter part, it has a plurality of level displacement shifters each output signal with this shift register of level shift, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide many level aging voltage poor to have voltage with multiple levels to adjacent sweep trace.
42. equipment as claimed in claim 31, wherein, this scanner driver comprises:
Shift register, it has a plurality of levels will begin the pulse displacement so that its beginning pulse as each output signal and next stage to be provided; With
The level displacement shifter part, it has a plurality of level displacement shifters each output signal with this shift register of level shift, in the scan period, scanning impulse being provided to sweep trace, and in digestion period, provide many level aging voltage poor to have voltage with multiple levels to adjacent sweep trace.
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