CN103366671A - Light emitting element display pixel - Google Patents
Light emitting element display pixel Download PDFInfo
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- CN103366671A CN103366671A CN2012101009396A CN201210100939A CN103366671A CN 103366671 A CN103366671 A CN 103366671A CN 2012101009396 A CN2012101009396 A CN 2012101009396A CN 201210100939 A CN201210100939 A CN 201210100939A CN 103366671 A CN103366671 A CN 103366671A
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- electric capacity
- emitting component
- light
- gauge tap
- picture element
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Abstract
The invention discloses a light emitting element display pixel comprising a control switch module, a drive capacitor, a drive switch and a light emitting element. The control switch module is applied to turn on/off according a scanning signal. A first end of the drive capacitor is electrically connected with the control switch module. A second end of the drive capacitor is electrically connected with a voltage level. The drive capacitor is used for receiving and storing a drive voltage when the control switch module turns on. The area of the drive capacitor occupies more than twenty percent of the area of the light emitting element display pixel. The drive switch is electrically connected with the drive capacitor and a voltage source, and is used for controlling a drive current flowing through the drive switch according to the drive voltage stored by the drive capacitor. The light emitting element is used for emitting light according to the drive current flowing through the drive switch. Therefore, the service life of the drive switch can be prolonged by the light emitting element display pixel.
Description
Technical field
The present invention relates to a kind of light-emitting component and show picture element, espespecially a kind of have large electric capacity to reduce the light-emitting component demonstration picture element of driving voltage update times.
Background technology
Please refer to Fig. 1, Fig. 1 is the schematic diagram that known light-emitting component shows picture element.As shown in Figure 1, known light-emitting component shows that picture element comprises that a gauge tap 110, drives electric capacity 120, one driving switchs 130, and a light-emitting component 140.Gauge tap 110 is in order to open and close according to one scan signal Vs.The first end that drives electric capacity 120 is to be electrically connected on gauge tap 110, the second end that drives electric capacity 120 is to be electrically connected on a voltage level VSS, driving electric capacity 120 is to be used to receive and store when gauge tap 110 is opened a driving voltage Vd, and after driving electric capacity 120 had stored driving voltage Vd, gauge tap 110 namely was closed.The first end t1 of driving switch 130 is electrically connected on a voltage source V DD, and the second end t2 of driving switch 130 is electrically connected on to drive electric capacity 120, and the 3rd end t3 of driving switch 130 is electrically connected on light-emitting component 140.Driving switch 130 is the drive current Id in order to the driving switch 130 of flowing through according to the driving voltage Vd control that drives electric capacity 120 storages.For instance, when the driving voltage Vd that drives electric capacity 120 storages is larger, the second end t2 and the voltage difference between the 3rd end t3 of driving switch 130 are also larger, the drive current Id of driving switch 130 of then flowing through is larger, and when driving driving voltage Vd that electric capacity 120 stores hour, the second end t2 and the voltage difference between the 3rd end t3 of driving switch 130 are also less, and the drive current Id of the driving switch 130 of then flowing through is less.Light-emitting component 140 is in order to luminous according to the drive current Id of driving switch 130 of flowing through, and when drive current Id was larger, the brightness when light-emitting component 140 is luminous was higher, when drive current Id hour, the brightness when light-emitting component 140 is luminous is lower.
Please refer to Fig. 2, and in the lump with reference to figure 1, Fig. 2 is the schematic layout pattern that Fig. 1 light-emitting component shows picture element 100, shows that wherein picture element 100 only represents the layout of single picture element (single pixel).As shown in Figure 2, light-emitting component shows that the layout of picture element 100 comprises a capacitive region A1 and a circuit region A2.Capacitive region A1 is the layout areas of driving electric capacity 120, and circuit region A2 is the layout areas for other circuit component (for example gauge tap 110 and driving switch 130).Show in the picture element 100 at known light-emitting component, the layout area of capacitive region A1 is to account for below the ten Percent of the total area that light-emitting component shows picture element 100.The layout area of capacitive region A1 is relevant with the capacitance that drives electric capacity 120, and when the layout area of capacitive region A1 is larger, the capacitance that then drives electric capacity 120 is larger, and when the layout area of capacitive region A1 is less, the capacitance that then drives electric capacity 120 is less.
According to above-mentioned configuration, when known light-emitting component showed picture element 100 display frame, the driving voltage Vd that drives electric capacity 120 storages can make the driving voltage Vd of storage more and more lower because of the leakage current of gauge tap 110 when closing.Quality for fear of influence of leakage current display frame, the display cycle of a picture frame (frame) of known light-emitting component demonstration picture element 100 is shorter, drives the driving voltage Vd that electric capacity 120 stores more repeatedly to open gauge tap 110 within the unit interval to upgrade.Yet the number of times that gauge tap 110 is opened is more frequent, and shortened the serviceable life of gauge tap 110, and light-emitting component shows that the power consumption of picture element 100 also can increase.
Summary of the invention
The invention provides a kind of light-emitting component and show picture element, described light-emitting component shows that picture element comprises a gauge tap module, and one drives electric capacity, a driving switch, and a light-emitting component.Described gauge tap module comprises the gauge tap of a plurality of serial connections, and more described gauge tap is in order to open and close synchronously according to the one scan signal.Described driving electric capacity is to be electrically connected on described switch module to be used to receive and store when described switch module is opened a driving voltage.Described driving switch is the drive current in order to the described driving switch of flowing through according to described driving voltage control.Described light-emitting component is to be electrically connected described driving switch, in order to luminous according to described drive current.
The present invention also provides a kind of light-emitting component to show picture element, and described light-emitting component shows that picture element comprises a gauge tap module, a switchable capacitive module, a driving switch, and a light-emitting component.Described gauge tap module is in order to open and close according to the one scan signal.The first end of described switchable capacitive module is to be electrically connected on described gauge tap module, the second end of described switchable capacitive module is to be electrically connected on a voltage level, described switchable capacitive module is to be used to receive when described gauge tap module is opened and store a driving voltage, and described switchable capacitive module is to change its capacitance according to a capacitance control signal.Described driving switch is to be electrically connected on described switchable capacitive module and a voltage source, controls a drive current of the described driving switch of flowing through in order to the described driving voltage that stores according to described switchable capacitive module.Described light-emitting component is in order to luminous according to the described drive current of the described gauge tap of flowing through.
Description of drawings
Fig. 1 is the schematic diagram that known light-emitting component shows picture element.
Fig. 2 is the schematic layout pattern that Fig. 1 light-emitting component shows picture element.
Fig. 3 is the schematic diagram that light-emitting component of the present invention shows picture element.
Fig. 4 is the schematic layout pattern that Fig. 3 light-emitting component shows picture element.
Fig. 5 is the also schematic diagram of an embodiment that light-emitting component of the present invention shows picture element.
Wherein, description of reference numerals is as follows:
100,200,300 light-emitting components show picture element
110 gauge tap
120,220,322,324 drive electric capacity
130,230,330 driving switchs
140,240,340 light-emitting components
210,310 gauge tap modules
212,312 gauge tap
320 switchable capacitive module
326 Capacity control switches
A1, A1 ' capacitive region
A2, A2 ' circuit region
T1 driving switch first end
T2 driving switch the second end
T3 driving switch the 3rd end
The VDD voltage source
The VSS voltage level
The Vd driving voltage
The Vs sweep signal
The Vc capacitance control signal
The Id drive current
Embodiment
Please refer to Fig. 3, Fig. 3 is the schematic diagram that light-emitting component of the present invention shows picture element 200.As shown in Figure 3, light-emitting component of the present invention shows that picture element 200 comprises that a gauge tap module 210, drives electric capacity 220, one driving switchs 230, and a light-emitting component 240.Wherein light-emitting component 240 can be Organic Light Emitting Diode (OLED), inorganic light-emitting diode ... Deng electroluminescent cell.Gauge tap module 210 comprises the gauge tap 212 of a plurality of serial connections, and the gauge tap 212 of gauge tap module 210 is in order to open and close synchronously according to one scan signal Vs.The first end that drives electric capacity 220 is to be electrically connected on gauge tap module 210, the second end that drives electric capacity 220 is to be electrically connected on a voltage level VSS, drive electric capacity 220 and be and receive and store a driving voltage Vd when gauge tap 212 that is used to gauge tap module 210 is unlocked, and after driving electric capacity 220 had stored driving voltage Vd, the gauge tap 212 of gauge tap module 210 namely was closed.The first end t1 of driving switch 230 is electrically connected on a voltage source V DD, and the second end t2 of driving switch 230 is electrically connected on to drive electric capacity 220, and the 3rd end t3 of driving switch 230 is electrically connected on light-emitting component 240.Driving switch 230 is the drive current Id in order to the driving switch 230 of flowing through according to the driving voltage Vd control that drives electric capacity 220 storages.For instance, when the driving voltage Vd that drives electric capacity 220 storages is larger, the second end t2 and the voltage difference between the 3rd end t3 of driving switch 230 are also larger, the drive current Id of driving switch 230 of then flowing through is larger, and when driving driving voltage Vd that electric capacity 220 stores hour, the second end t2 and the voltage difference between the 3rd end t3 of driving switch 230 are also less, and the drive current Id of the driving switch 230 of then flowing through is less.Light-emitting component 240 is in order to luminous according to the drive current Id of driving switch 230 of flowing through, and when drive current Id was larger, the brightness when light-emitting component 240 is luminous was higher, when drive current Id hour, the brightness when light-emitting component 240 is luminous is lower.
Please refer to Fig. 4, and in the lump with reference to figure 3, Fig. 4 is the schematic layout pattern that Fig. 3 light-emitting component shows picture element 200, shows that wherein picture element 200 only represents the layout of single picture element (single pixel).As shown in Figure 4, light-emitting component shows that the layout of picture element 200 comprises a capacitive region A1 ' and a circuit region A2 '.Capacitive region A1 ' is the layout areas of driving electric capacity 220, and circuit region A2 ' is the layout areas for other circuit component (for example gauge tap module 210 and driving switch 230).Show in the picture element 200 at light-emitting component of the present invention, the layout area of capacitive region A1 ' is to account for more than 20 percent of the total area that light-emitting component shows picture element 200, that is light-emitting component of the present invention shows that the driving electric capacity 220 of picture element 200 is to show more than the twice of driving electric capacity 120 of picture element 100 for known light-emitting component.
When light-emitting component of the present invention shows picture element 200 display frame, because gauge tap module 210 comprises the gauge tap 212 of a plurality of serial connections, therefore the leakage current of gauge tap module 210 when closing is less, that is drives that driving voltage Vd that electric capacity 220 stores is subjected to influence of leakage current and the amplitude that reduces is less.In addition, because it is for known light-emitting component shows more than the twice of driving electric capacity 120 of picture element 100 that light-emitting component of the present invention shows the driving electric capacity 220 of picture element 200, so leakage current further reduces again the influence degree of the driving voltage Vd that drives electric capacity 220 and store.According to above-mentioned configuration, picture frame (frame) display cycle can be elongated, for example, can with picture frame (frame) display cycle by 16.67 milliseconds of elongations to 1 second, therefore the number of times that so upgrades the driving voltage Vd that drives electric capacity 220 storages can reduce, that is the number of times that the gauge tap 212 of control switch module 210 is unlocked within the unit interval can reduce.Especially be applied in when showing tableaux, 212 need of the gauge tap of gauge tap module 210 are unlocked and once can make light-emitting component show that picture element 200 shows identical picture data in the long period.Therefore, the serviceable life of the gauge tap 212 of light-emitting component demonstration picture element 200 of the present invention is longer, and light-emitting component shows that the power consumption of picture element 200 also can reduce.
In addition, at a picture frame in the display cycle, when light-emitting component 240 is luminous, voltage level VSS is an earthing potential (for example 0 volt), and when light-emitting component 240 was not luminous, voltage level VSS was a negative potential (for example negative 5 volts), was pulled down to 0 volt so that drive the current potential (that is current potential of the second end t2 of driving switch 230) of the first end of electric capacity 220, so when light-emitting component 240 was not luminous, driving switch 230 can positively be closed.
Please refer to Fig. 5, Fig. 5 is the also schematic diagram of an embodiment that light-emitting component of the present invention shows picture element 300.As shown in Figure 5, light-emitting component of the present invention shows that picture element 300 comprises a gauge tap module 310, one switchable capacitive module 320, one driving switchs 330, and a light-emitting component 340.Gauge tap module 310 among Fig. 5, driving switch 330, reaching light-emitting component 340 is gauge tap module 210, the driving switchs 230 that are same as among Fig. 3, and light-emitting component 340, therefore no longer explanation.Switchable capacitive module 320 comprises that one first drives electric capacity 322, one second driving electric capacity 324, and a Capacity control switch 326.The first first end that drives electric capacity 322 is that to be electrically connected on the second end that gauge tap module 310, the first drives electric capacity 322 be to be electrically connected on voltage level VSS.The second first end that drives electric capacity 324 is that to be electrically connected on the second end that gauge tap module 310, the second drives electric capacity 324 be to be electrically connected on Capacity control switch 326.The second 324 capacitances that drive electric capacity are the capacitances greater than the first driving electric capacity 322.Capacity control switch 326 is to be electrically connected on second to drive between second end and voltage level VSS of electric capacity 324, in order to open and close according to a capacitance control signal Vc.When Capacity control switch 326 is closed, the capacitance of switchable capacitive module 320 equals the capacitance of the first driving electric capacity 322, and when Capacity control switch 326 was unlocked, the capacitance of switchable capacitive module 320 equaled the sum total that the first capacitance and second that drives electric capacity 322 drives the capacitance of electric capacity 324.
According to above-mentioned configuration, when light-emitting component showed that picture element 300 is used for showing dynamic menu, Capacity control switch 326 can be closed to turn down the capacitance of switchable capacitive module 320, and then reduced the duration of charging of switchable capacitive module 320; And when light-emitting component showed that picture element 300 is used for showing tableaux, Capacity control switch 326 can be unlocked to heighten the capacitance of switchable capacitive module 320, and then can prolong the time that light-emitting component shows picture element 300 demonstration same frame data.
In addition, the gauge tap 212,312 of gauge tap module 210, a plurality of serial connections of 310 can be to be indium gallium zinc oxygen thin-film transistors.Indium gallium zinc oxygen thin-film transistors has better current lead-through characteristic, allowing that larger electric current passes through when opening, and then can fill full with driving electric capacity 220,322,324 rapidly.
Compared to prior art, light-emitting component of the present invention shows that picture element can reduce the number of times that driving switch is unlocked when display frame, and then prolongs the serviceable life of driving switch, and reduces the power consumption that light-emitting component shows picture element.Moreover light-emitting component demonstration picture element of the present invention also can flexibly be adjusted capacitance, to show adaptively dynamic or static picture.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a light-emitting component shows picture element, it is characterized in that, comprising:
One gauge tap module comprises the gauge tap of a plurality of serial connections, and more described gauge tap is in order to open and close synchronously according to the one scan signal;
One first drives electric capacity, and described first drives electric capacity is electrically connected on described gauge tap module, is used to receive and store when described gauge tap module is opened a driving voltage;
One driving switch is in order to a drive current of the described driving switch of flowing through according to described driving voltage control; And
One light-emitting component is electrically connected described driving switch, in order to luminous according to described drive current.
2. demonstration picture element as claimed in claim 1, it is characterized in that, the described first first end that drives electric capacity is to be electrically connected on described switch module, the described first the second end that drives electric capacity is to be electrically connected on a voltage level, described voltage level is to be an earthing potential when described light-emitting component is luminous, and described voltage level is to be a negative potential when described light-emitting component is not luminous.
3. demonstration picture element as claimed in claim 1 is characterized in that, the described first area that drives electric capacity is to account for more than 20 percent of area that described light-emitting component shows picture element.
4. demonstration picture element as claimed in claim 1 is characterized in that, the gauge tap of described a plurality of serial connections is to be indium gallium zinc oxygen thin-film transistors.
5. demonstration picture element as claimed in claim 1 is characterized in that, described driving switch is to be electrically connected on described first to drive electric capacity, described light-emitting component and a voltage source.
6. a light-emitting component shows picture element, it is characterized in that, comprising:
One gauge tap module comprises the gauge tap of a plurality of serial connections, in order to open and close according to the one scan signal;
One switchable capacitive module, the first end of described switchable capacitive module is to be electrically connected on described gauge tap module, the second end of described switchable capacitive module is to be electrically connected on a voltage level, described switchable capacitive module is to be used to receive when described gauge tap module is opened and store a driving voltage, and described switchable capacitive module is to change its capacitance according to a capacitance control signal;
One driving switch is electrically connected on described switchable capacitive module and a voltage source, controls a drive current of the described driving switch of flowing through in order to the described driving voltage that stores according to described switchable capacitive module; And
One light-emitting component is in order to luminous according to the described drive current of the described gauge tap of flowing through.
7. demonstration picture element as claimed in claim 6 is characterized in that, described voltage level is to be an earthing potential when described light-emitting component is luminous, and described voltage level is to be a negative potential when described light-emitting component is not luminous.
8. demonstration picture element as claimed in claim 6 is characterized in that, described driving switch is to be electrically connected on described switchable capacitive module, described light-emitting component and a voltage source.
9. demonstration picture element as claimed in claim 8 is characterized in that, the switch of described a plurality of serial connections is to be indium gallium zinc oxygen thin-film transistors.
10. demonstration picture element as claimed in claim 6 is characterized in that, described switchable capacitive module comprises:
One first drives electric capacity, and the described first first end that drives electric capacity is to be electrically connected on described gauge tap module, and the described first the second end that drives electric capacity is to be electrically connected on described voltage level;
One second drives electric capacity, and the described second first end that drives electric capacity is to be electrically connected on described gauge tap module; And
One Capacity control switch is electrically connected on described second and drives between second end and described voltage level of electric capacity, in order to open and close according to described capacitance control signal.
11. demonstration picture element as claimed in claim 10 is characterized in that, the described second capacitance that drives electric capacity is the capacitance greater than described the first driving electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101009396A CN103366671A (en) | 2012-04-06 | 2012-04-06 | Light emitting element display pixel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101009396A CN103366671A (en) | 2012-04-06 | 2012-04-06 | Light emitting element display pixel |
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| CN103366671A true CN103366671A (en) | 2013-10-23 |
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| CN2012101009396A Pending CN103366671A (en) | 2012-04-06 | 2012-04-06 | Light emitting element display pixel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020180671A1 (en) * | 2001-05-30 | 2002-12-05 | Semiconductor Energy Laboratory Co., Ltd. | Display device and method of driving the same |
| CN1719508A (en) * | 2005-08-10 | 2006-01-11 | 友达光电股份有限公司 | Pixel circuit of display |
| CN101582235A (en) * | 2008-05-17 | 2009-11-18 | 乐金显示有限公司 | Light emitting display and method for driving the same |
| CN101650916A (en) * | 2008-08-08 | 2010-02-17 | 索尼株式会社 | Display device and electronic apparatus |
| US7868858B2 (en) * | 2004-10-28 | 2011-01-11 | Au Optronics Corp. | Current-driven oled panel and related pixel structure |
-
2012
- 2012-04-06 CN CN2012101009396A patent/CN103366671A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020180671A1 (en) * | 2001-05-30 | 2002-12-05 | Semiconductor Energy Laboratory Co., Ltd. | Display device and method of driving the same |
| US7868858B2 (en) * | 2004-10-28 | 2011-01-11 | Au Optronics Corp. | Current-driven oled panel and related pixel structure |
| CN1719508A (en) * | 2005-08-10 | 2006-01-11 | 友达光电股份有限公司 | Pixel circuit of display |
| CN101582235A (en) * | 2008-05-17 | 2009-11-18 | 乐金显示有限公司 | Light emitting display and method for driving the same |
| CN101650916A (en) * | 2008-08-08 | 2010-02-17 | 索尼株式会社 | Display device and electronic apparatus |
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Application publication date: 20131023 |