EP1729282A2 - Display drive circuit and drive method for the same - Google Patents
Display drive circuit and drive method for the same Download PDFInfo
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- EP1729282A2 EP1729282A2 EP06114420A EP06114420A EP1729282A2 EP 1729282 A2 EP1729282 A2 EP 1729282A2 EP 06114420 A EP06114420 A EP 06114420A EP 06114420 A EP06114420 A EP 06114420A EP 1729282 A2 EP1729282 A2 EP 1729282A2
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- Prior art keywords
- display
- data
- maintaining capacitor
- transistor
- frame
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Definitions
- the present invention relates to a display drive circuit and a drive method for the same and, more particularly, to a drive circuit and a drive method using thin-film transistors as synchronous drive components.
- Fig. 1 is an equivalent circuit diagram of a prior art thin film transistor LCD panel and its peripheral drive circuit.
- crisscrossing data electrodes (Y1, Y2 ... Ym) and scan electrodes (X1, X2 ... Xn) are formed on an LCD panel 1.
- Each set of crisscrossing data electrode and scan electrode can be used to control a display device D.
- the data electrode Y1 and the scan electrode X1 can be used to control a display device D1.
- Each display device D is controlled by a set of crisscrossing data and scan electrodes via a drive circuit.
- the equivalent circuit of each drive circuit is formed by connecting a thin film transistor Q for controlling entry of data and a storage capacitor C.
- the gate and drain of the thin film transistor Q are connected to a scan electrode and a data electrode, respectively.
- a scan signal on a scan electrode can conduct or cut off all thin film transistors Q in the same row, that is, the same scan line, thereby controlling whether a video signal on the data electrode can be written to a corresponding display device D.
- Fig. 2 shows waveforms of scan signals in the prior art.
- a scan drive unit 12 outputs scan signals (S1, S2 ... Sn) to the scan electrodes (X1, X2 ... Xn) based on a predetermined scanning order.
- scan electrode has a scan signal thereon, all the thin film transistors Q in the drive circuits in the same row or on the same scan electrode conduct, while the thin film transistors Q in other rows are cut off.
- a data drive unit 10 will send out a corresponding video signal, a gray-level value, to m display devices of that row based on the image data to be displayed.
- the scan drive unit 12 finishes one scanning action on all n rows of scan lines, the display action of a frame is complete. Repetitively scanning all the scan electrodes (X1, X2 ... Xn) and sending out the video signal of image data can accomplish the object of continuously displaying an image.
- the display action of a frame of the prior art LCD panel 1 is controlled by the scan signals (S1, S2 ... Sn).
- This kind of drive control technology usually cannot effectively finish the display action of the LCD panel 1 owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor of each drive circuit. Therefore, frame retention during frame crossover will occur, affecting the display quality of the LCD panel 1:
- An object of the present invention is to provide a display drive circuit and a drive method for the same, in which thin film transistors are used as synchronous drive components.
- the drive circuit of the present invention is used in an LCD panel.
- the drive circuit comprises a first maintaining capacitor and a second maintaining capacitor.
- Each drive circuit of the LCD panel is controlled by a first control signal.
- Image data of a frame are temporarily stored into the first maintaining capacitor in a frame time based on scan signals, while image data of the previous frame originally stored in the second maintaining capacitor are synchronously transferred to a display unit, thereby accomplishing synchronous display actions of the LCD panel.
- each drive circuit of the LCD panel is controlled by a second control signal.
- Image data of the next frame are temporarily stored into the second maintaining capacitor in a frame time based on scan signals, while image data of the previous frame originally stored in the first maintaining capacitor are synchronously transferred to the display unit, thereby accomplishing synchronous display actions of the LCD panel. In this way, frames respectively stored in the first and second maintaining capacitors can be continuously and alternately output for display.
- the present invention provides a drive circuit comprising a transistor controlled by a scan signal to capture a data signal.
- a first charging transistor is connected to the transistor and a first maintaining capacitor, and is controlled by a first control signal to obtain the data signal and store the data signal in the first maintaining capacitor.
- a second charging transistor is connected to the transistor and a second maintaining capacitor, and is controlled by a second control signal to obtain the data signal and store the data signal in the second maintaining capacitor.
- a first discharge transistor is connected to the first maintaining capacitor and the display device and is controlled by the second control signal to transfer the data signal stored in the first maintaining capacitor to the display device.
- a second discharge transistor is connected to the second maintaining capacitor and the display device, and is controlled by the first control signal to transfer the data signal stored in the second maintaining capacitor to the display device.
- the drive circuit is alternately controlled by the first control signal and the second control signal every frame time, and performs storage or release of image data to the first maintaining capacitor and the second maintaining capacitor in an LCD panel according to scan signals.
- first and second control signals frames respectively stored in the first and second maintaining capacitors in the LCD panel can be continuously and alternately output for display. Therefore, the present invention can solve the problem of frame retention during frame crossover owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor.
- Fig. 3 is an equivalent circuit diagram of an LCD panel and a peripheral drive circuit thereof according to the present invention.
- the present invention applies to an LCD panel 2 with crisscrossing data electrodes (Y1, Y2 ... Ym). Scan electrodes (X1, X2 ... Xn) are formed thereon.
- the data electrodes (Y1, Y2 ... Ym) are correspondingly connected to outputs of a data drive unit 24, while scan electrodes (X1, X2 ... Xn) are correspondingly connected to outputs of a scan drive unit 22.
- Each set of crisscrossing data electrode and scan electrode can be used to control a display unit 20 according to the output of the scan drive unit 22 and the output of the data drive unit 24.
- Each display unit 20 of the LCD panel 2 uses the drive circuit of the present invention to drive a display device D.
- the display device D is a liquid crystal display (LCD).
- the drive circuit of the present invention comprises a transistor Q.
- the transistor Q is a thin film transistor (TFT).
- the gate of the transistor Q is connected to an output of the scan drive unit 22 via a scan electrode X to receive a scan signal.
- the drain of the transistor Q is connected to an output of the data drive unit 24 via a data electrode Y to obtain a data signal.
- the source of the transistor Q is connected to a first charging transistor Qc 1 and a second charging transistor Qc2.
- the first charging transistor Qc1 is also connected to a first maintaining capacitor C1, obtains the data signal according to the conduction state of the transistor Q, and is controlled by a first control signal CN1 to store the data signal to the first maintaining capacitor C1.
- the second charging transistor Qc2 is also connected to a second maintaining capacitor C2, obtains the data signal according to the conduction state of the transistor Q, and is controlled by a second control signal CN2 to store the data signal in the second maintaining capacitor C2.
- a first discharge transistor Qd1 is connected to the first maintaining capacitor C1 and the display device D, and is controlled by the second control signal CN2 to transfer the data signal stored in the first maintaining capacitor C1 to the display device D.
- a second discharge transistor Qd2 is connected to the second maintaining capacitor C2 and the display device D, and is controlled by the first control signal CN1 to transfer the data signal stored in the second maintaining capacitor C2 in the display device D.
- Scan signals (S1, S2 ... Sn) are sent out by the scan drive unit 22.
- the scan signals (S1, S2 ... Sn) are periodically sent to each display unit 20 via the scan electrodes (X1, X2 ... Xn) of the LCD panel 2 according to a predetermined scan order.
- the scan drive unit 22 also periodically sends out the first control signal CN1 and the second control signals CN2 to each display unit 22 to complete synchronous display actions of the LCD panel 2.
- a scan electrode (X1, X2 ... Xn) receives a scan signal
- the transistors Q in all the display units 20 in the same row or on the same scan electrode conduct, while the transistors Q in the other rows are cut off.
- the first control signal CN1 is high
- the first charging transistor Qc1 in each display unit 20 conducts. Because the transistor Q in each display unit 20 also conducts, the data signal output by the data drive unit 24 will first be temporarily stored in the first maintaining capacitors C 1 in all the display units 20 in the same row or on the same scan electrode.
- the scan signals (S1, S2 ... Sn) sent out by the scan drive unit 22 are periodically transferred to all the display units 20 in the same row or on the same scan electrode on the LCD panel 2 via the scan electrodes (X1, X2 ... Xn) in a predetermined scan order.
- the data signal output by the data drive unit 24 will first be temporarily stored in the first maintaining capacitors C 1 in all the display units 20 on the LCD panel 2. This is the image data of a frame.
- the first control signal CN1 when the first control signal CN1 is high in a frame time, the first control signal CN1 simultaneously turns the first discharge transistor Qd1 on.
- the image data of a frame already stored in the second maintaining capacitors C2 in all the display units 20 will be output to the display device D for image display.
- the second control signal CN2 When the second control signal CN2 alternately rises to a high level after the first control signal CN1 and the first control signal CN1 drops to a low level, the second charge transistors Qc2 in all the display units 20 will be controlled to be on. Because the transistors Q in all the display unit 20 are on, the data signal output by the data drive unit 24 will first be temporarily stored in the second maintaining capacitors C2 in all the display units 20 in the same row or on the same scan electrode.
- the scan signals (S1, S2 ... Sn) sent out by the scan drive unit 22 are periodically transferred to all the display units 20 in the same row or on the same scan electrode on the LCD panel 2 via the scan electrodes (X1, X2 ... Xn) in a predetermined scan order.
- the second control signal CN2 is high in a frame time, the data signal output by the data drive unit 24 will first be temporarily stored in the second maintaining capacitors C2 in all the display units 20 on the LCD panel 2. This is the image data of a frame.
- the second control signal CN2 when the second control signal CN2 is high in a frame time, the second control signal CN2 simultaneously turns the second discharge transistor Qd2 on.
- the image data of a frame already stored in the first maintaining capacitors C1 in all the display units 20 will be output to the display device D doe image display.
- the drive circuit of the present invention is alternately controlled by the first control signal CN1 and the second control signal CN2 every frame time, and performs storage or release of image data to the first maintaining capacitor C 1 and the second maintaining capacitor C2 in the LCD panel according to scan signals.
- first and second control signals frames respectively stored in the first maintaining capacitor C1 and the second maintaining capacitor C2 in the LCD panel can be continuously and alternately output for display. Therefore, the present invention can solve the problem of frame retention during frame crossover owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor.
- a display drive method of the present invention comprises the steps of: sequentially turning a transistor in each display unit on to obtain a frame's data; sequentially storing the frame's data to a first maintaining capacitor in each display unit; and synchronously transferring a previous frame's data stored in a second maintaining capacitor in each display unit to a display device.
- the transistors are sequentially turned on to obtain the next frame's data, the next frame's data is sequentially stored in the second maintaining capacitor in each display unit, and the frame's data stored in the first maintaining capacitor in each display unit is synchronously transferring to the display device. In this way, frames respectively stored in the first and second maintaining capacitors can be continuously output for display.
- the present invention also provides a display drive method comprising the steps of: storing a frame's data into a first maintaining capacitor in each display unit; and synchronously transferring a previous frame's data stored in a second maintaining capacitor in each display unit to a display device. After synchronous transfer, the next frame's data is stored in the second maintaining capacitor in each display unit, and the frame's data stored in the first maintaining capacitor in each display unit is synchronously transferred to the display device.
- the present invention can solve the problem of frame retention during frame crossover owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor.
Abstract
Description
- The present invention relates to a display drive circuit and a drive method for the same and, more particularly, to a drive circuit and a drive method using thin-film transistors as synchronous drive components.
- Fig. 1 is an equivalent circuit diagram of a prior art thin film transistor LCD panel and its peripheral drive circuit. As shown in Fig. 1, crisscrossing data electrodes (Y1, Y2 ... Ym) and scan electrodes (X1, X2 ... Xn) are formed on an
LCD panel 1. Each set of crisscrossing data electrode and scan electrode can be used to control a display device D. For instance, the data electrode Y1 and the scan electrode X1 can be used to control a display device D1. Each display device D is controlled by a set of crisscrossing data and scan electrodes via a drive circuit. The equivalent circuit of each drive circuit is formed by connecting a thin film transistor Q for controlling entry of data and a storage capacitor C. - The gate and drain of the thin film transistor Q are connected to a scan electrode and a data electrode, respectively. A scan signal on a scan electrode can conduct or cut off all thin film transistors Q in the same row, that is, the same scan line, thereby controlling whether a video signal on the data electrode can be written to a corresponding display device D.
- Reference is made to Fig. 2 as well as Fig. 1. Fig. 2 shows waveforms of scan signals in the prior art. A
scan drive unit 12 outputs scan signals (S1, S2 ... Sn) to the scan electrodes (X1, X2 ... Xn) based on a predetermined scanning order. When some scan electrode has a scan signal thereon, all the thin film transistors Q in the drive circuits in the same row or on the same scan electrode conduct, while the thin film transistors Q in other rows are cut off. When some scan electrode is selected, adata drive unit 10 will send out a corresponding video signal, a gray-level value, to m display devices of that row based on the image data to be displayed. - When the
scan drive unit 12 finishes one scanning action on all n rows of scan lines, the display action of a frame is complete. Repetitively scanning all the scan electrodes (X1, X2 ... Xn) and sending out the video signal of image data can accomplish the object of continuously displaying an image. - The display action of a frame of the prior
art LCD panel 1 is controlled by the scan signals (S1, S2 ... Sn). This kind of drive control technology, however, usually cannot effectively finish the display action of theLCD panel 1 owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor of each drive circuit. Therefore, frame retention during frame crossover will occur, affecting the display quality of the LCD panel 1: - An object of the present invention is to provide a display drive circuit and a drive method for the same, in which thin film transistors are used as synchronous drive components. The drive circuit of the present invention is used in an LCD panel. The drive circuit comprises a first maintaining capacitor and a second maintaining capacitor. Each drive circuit of the LCD panel is controlled by a first control signal. Image data of a frame are temporarily stored into the first maintaining capacitor in a frame time based on scan signals, while image data of the previous frame originally stored in the second maintaining capacitor are synchronously transferred to a display unit, thereby accomplishing synchronous display actions of the LCD panel.
- In the next frame time, each drive circuit of the LCD panel is controlled by a second control signal. Image data of the next frame are temporarily stored into the second maintaining capacitor in a frame time based on scan signals, while image data of the previous frame originally stored in the first maintaining capacitor are synchronously transferred to the display unit, thereby accomplishing synchronous display actions of the LCD panel. In this way, frames respectively stored in the first and second maintaining capacitors can be continuously and alternately output for display.
- To achieve the above objects, the present invention provides a drive circuit comprising a transistor controlled by a scan signal to capture a data signal. A first charging transistor is connected to the transistor and a first maintaining capacitor, and is controlled by a first control signal to obtain the data signal and store the data signal in the first maintaining capacitor. A second charging transistor is connected to the transistor and a second maintaining capacitor, and is controlled by a second control signal to obtain the data signal and store the data signal in the second maintaining capacitor. A first discharge transistor is connected to the first maintaining capacitor and the display device and is controlled by the second control signal to transfer the data signal stored in the first maintaining capacitor to the display device. A second discharge transistor is connected to the second maintaining capacitor and the display device, and is controlled by the first control signal to transfer the data signal stored in the second maintaining capacitor to the display device.
- The drive circuit is alternately controlled by the first control signal and the second control signal every frame time, and performs storage or release of image data to the first maintaining capacitor and the second maintaining capacitor in an LCD panel according to scan signals. Through alternate control of the first and second control signals, frames respectively stored in the first and second maintaining capacitors in the LCD panel can be continuously and alternately output for display. Therefore, the present invention can solve the problem of frame retention during frame crossover owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor.
- The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
- Fig. 1 is an equivalent circuit diagram of a prior art thin film transistor LCD panel and its peripheral drive circuit;
- Fig. 2 shows waveforms of scan signals in the prior art;
- Fig. 3 is an equivalent circuit diagram of an LCD panel and a peripheral drive circuit thereof according to the present invention;
- Fig. 4 is a circuit diagram of a drive circuit of the present invention; and
- Fig. 5 shows waveforms of scan signals and control signals of the present invention.
- Fig. 3 is an equivalent circuit diagram of an LCD panel and a peripheral drive circuit thereof according to the present invention. The present invention applies to an
LCD panel 2 with crisscrossing data electrodes (Y1, Y2 ... Ym). Scan electrodes (X1, X2 ... Xn) are formed thereon. The data electrodes (Y1, Y2 ... Ym) are correspondingly connected to outputs of adata drive unit 24, while scan electrodes (X1, X2 ... Xn) are correspondingly connected to outputs of ascan drive unit 22. Each set of crisscrossing data electrode and scan electrode can be used to control adisplay unit 20 according to the output of thescan drive unit 22 and the output of thedata drive unit 24. - Reference is made to Fig. 4 as well as Fig. 3. Each
display unit 20 of theLCD panel 2 uses the drive circuit of the present invention to drive a display device D. The display device D is a liquid crystal display (LCD). The drive circuit of the present invention comprises a transistor Q. The transistor Q is a thin film transistor (TFT). The gate of the transistor Q is connected to an output of thescan drive unit 22 via a scan electrode X to receive a scan signal. The drain of the transistor Q is connected to an output of the data driveunit 24 via a data electrode Y to obtain a data signal. - The source of the transistor Q is connected to a first
charging transistor Qc 1 and a second charging transistor Qc2. The first charging transistor Qc1 is also connected to a first maintaining capacitor C1, obtains the data signal according to the conduction state of the transistor Q, and is controlled by a first control signal CN1 to store the data signal to the first maintaining capacitor C1. The second charging transistor Qc2 is also connected to a second maintaining capacitor C2, obtains the data signal according to the conduction state of the transistor Q, and is controlled by a second control signal CN2 to store the data signal in the second maintaining capacitor C2. A first discharge transistor Qd1 is connected to the first maintaining capacitor C1 and the display device D, and is controlled by the second control signal CN2 to transfer the data signal stored in the first maintaining capacitor C1 to the display device D. A second discharge transistor Qd2 is connected to the second maintaining capacitor C2 and the display device D, and is controlled by the first control signal CN1 to transfer the data signal stored in the second maintaining capacitor C2 in the display device D. - Reference is made to Fig. 5 as well as Figs. 3 and 4. Scan signals (S1, S2 ... Sn) are sent out by the
scan drive unit 22. The scan signals (S1, S2 ... Sn) are periodically sent to eachdisplay unit 20 via the scan electrodes (X1, X2 ... Xn) of theLCD panel 2 according to a predetermined scan order. In each period of the scan signals (S1, S2 ... Sn), thescan drive unit 22 also periodically sends out the first control signal CN1 and the second control signals CN2 to eachdisplay unit 22 to complete synchronous display actions of theLCD panel 2. - When a scan electrode (X1, X2 ... Xn) receives a scan signal, the transistors Q in all the
display units 20 in the same row or on the same scan electrode conduct, while the transistors Q in the other rows are cut off. When the first control signal CN1 is high, the first charging transistor Qc1 in eachdisplay unit 20 conducts. Because the transistor Q in eachdisplay unit 20 also conducts, the data signal output by the data driveunit 24 will first be temporarily stored in the first maintainingcapacitors C 1 in all thedisplay units 20 in the same row or on the same scan electrode. - The scan signals (S1, S2 ... Sn) sent out by the
scan drive unit 22 are periodically transferred to all thedisplay units 20 in the same row or on the same scan electrode on theLCD panel 2 via the scan electrodes (X1, X2 ... Xn) in a predetermined scan order. When the first control signal CN1 is high in a frame time, the data signal output by the data driveunit 24 will first be temporarily stored in the first maintainingcapacitors C 1 in all thedisplay units 20 on theLCD panel 2. This is the image data of a frame. - At the same time, when the first control signal CN1 is high in a frame time, the first control signal CN1 simultaneously turns the first discharge transistor Qd1 on. The image data of a frame already stored in the second maintaining capacitors C2 in all the
display units 20 will be output to the display device D for image display. - When the second control signal CN2 alternately rises to a high level after the first control signal CN1 and the first control signal CN1 drops to a low level, the second charge transistors Qc2 in all the
display units 20 will be controlled to be on. Because the transistors Q in all thedisplay unit 20 are on, the data signal output by the data driveunit 24 will first be temporarily stored in the second maintaining capacitors C2 in all thedisplay units 20 in the same row or on the same scan electrode. - The scan signals (S1, S2 ... Sn) sent out by the
scan drive unit 22 are periodically transferred to all thedisplay units 20 in the same row or on the same scan electrode on theLCD panel 2 via the scan electrodes (X1, X2 ... Xn) in a predetermined scan order. When the second control signal CN2 is high in a frame time, the data signal output by the data driveunit 24 will first be temporarily stored in the second maintaining capacitors C2 in all thedisplay units 20 on theLCD panel 2. This is the image data of a frame. - At the same time, when the second control signal CN2 is high in a frame time, the second control signal CN2 simultaneously turns the second discharge transistor Qd2 on. The image data of a frame already stored in the first maintaining capacitors C1 in all the
display units 20 will be output to the display device D doe image display. - The drive circuit of the present invention is alternately controlled by the first control signal CN1 and the second control signal CN2 every frame time, and performs storage or release of image data to the first maintaining
capacitor C 1 and the second maintaining capacitor C2 in the LCD panel according to scan signals. Through alternate control of the first and second control signals, frames respectively stored in the first maintaining capacitor C1 and the second maintaining capacitor C2 in the LCD panel can be continuously and alternately output for display. Therefore, the present invention can solve the problem of frame retention during frame crossover owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor. - A display drive method of the present invention comprises the steps of: sequentially turning a transistor in each display unit on to obtain a frame's data; sequentially storing the frame's data to a first maintaining capacitor in each display unit; and synchronously transferring a previous frame's data stored in a second maintaining capacitor in each display unit to a display device. After the step of synchronous transfer, the transistors are sequentially turned on to obtain the next frame's data, the next frame's data is sequentially stored in the second maintaining capacitor in each display unit, and the frame's data stored in the first maintaining capacitor in each display unit is synchronously transferring to the display device. In this way, frames respectively stored in the first and second maintaining capacitors can be continuously output for display.
- The present invention also provides a display drive method comprising the steps of: storing a frame's data into a first maintaining capacitor in each display unit; and synchronously transferring a previous frame's data stored in a second maintaining capacitor in each display unit to a display device. After synchronous transfer, the next frame's data is stored in the second maintaining capacitor in each display unit, and the frame's data stored in the first maintaining capacitor in each display unit is synchronously transferred to the display device. Through alternate control of the first and second control signals, frames respectively stored in the first and second maintaining capacitors in the LCD panel can be continuously output for display. Therefore, the present invention can solve the problem of frame retention during frame crossover owing to the charging and discharge transient characteristics of the thin film transistor and the storage capacitor.
- Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have been suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.
Claims (8)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CNB2005100755464A CN100449599C (en) | 2005-06-03 | 2005-06-03 | Drive circuit for display, and drive method |
Publications (2)
Publication Number | Publication Date |
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EP1729282A2 true EP1729282A2 (en) | 2006-12-06 |
EP1729282A3 EP1729282A3 (en) | 2009-07-15 |
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Application Number | Title | Priority Date | Filing Date |
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EP06114420A Withdrawn EP1729282A3 (en) | 2005-06-03 | 2006-05-23 | Display drive circuit and drive method for the same |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1729282A3 (en) |
CN (1) | CN100449599C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102938246B (en) * | 2012-12-06 | 2015-12-02 | 深圳市华星光电技术有限公司 | The drive system of liquid crystal display |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5945972A (en) * | 1995-11-30 | 1999-08-31 | Kabushiki Kaisha Toshiba | Display device |
EP1026658A1 (en) * | 1998-08-03 | 2000-08-09 | Seiko Epson Corporation | Electrooptic device, substrate therefor, electronic device, and projection display |
US20020021295A1 (en) * | 2000-08-18 | 2002-02-21 | Jun Koyama | Liquid crystal display device and method of driving the same |
US6831624B1 (en) * | 1999-01-15 | 2004-12-14 | Sharp Kabushiki Kaisha | Time sequentially scanned display |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0535954B1 (en) * | 1991-10-04 | 1998-04-15 | Kabushiki Kaisha Toshiba | Liquid crystal display device |
JPH09114421A (en) * | 1995-10-19 | 1997-05-02 | Asahi Glass Co Ltd | Color liquid crystal display device |
US6476785B1 (en) * | 1999-11-08 | 2002-11-05 | Atmel Corporation | Drive circuit for liquid crystal display cell |
CN100435201C (en) * | 2002-11-15 | 2008-11-19 | 奇景光电股份有限公司 | Drive circuit for liquid crystal unit structure and control method thereof |
WO2005027138A1 (en) * | 2003-09-10 | 2005-03-24 | Rohm Co., Ltd | Light control apparatus and method for driving the same |
-
2005
- 2005-06-03 CN CNB2005100755464A patent/CN100449599C/en not_active Expired - Fee Related
-
2006
- 2006-05-23 EP EP06114420A patent/EP1729282A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5945972A (en) * | 1995-11-30 | 1999-08-31 | Kabushiki Kaisha Toshiba | Display device |
EP1026658A1 (en) * | 1998-08-03 | 2000-08-09 | Seiko Epson Corporation | Electrooptic device, substrate therefor, electronic device, and projection display |
US6831624B1 (en) * | 1999-01-15 | 2004-12-14 | Sharp Kabushiki Kaisha | Time sequentially scanned display |
US20020021295A1 (en) * | 2000-08-18 | 2002-02-21 | Jun Koyama | Liquid crystal display device and method of driving the same |
Also Published As
Publication number | Publication date |
---|---|
EP1729282A3 (en) | 2009-07-15 |
CN100449599C (en) | 2009-01-07 |
CN1873757A (en) | 2006-12-06 |
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