CN1272762C - Liquid crystal display drive circuit and the liquid crystal display thereof - Google Patents
Liquid crystal display drive circuit and the liquid crystal display thereof Download PDFInfo
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- CN1272762C CN1272762C CN 02123264 CN02123264A CN1272762C CN 1272762 C CN1272762 C CN 1272762C CN 02123264 CN02123264 CN 02123264 CN 02123264 A CN02123264 A CN 02123264A CN 1272762 C CN1272762 C CN 1272762C
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Abstract
The present invention relates to a driving circuit of a liquid crystal display panel, which is suitable for outputting corresponding video signals so as to control the liquid crystal display panel according to image control signals provided by a host machine. A driving device of a liquid crystal display comprises a grid driver and a data driver, wherein the grid driver is used for delivering scanning signals to a grid electrode; the data driver is used for outputting the video signals to a data electrode according to the image control signals; the video signals which correspond to the image control signals of a first and a second frames are respectively a first signal level and a second signal level. When the first signal level is lower than the second signal level, the data driver orderly comprises a first output signal which is higher than the second signal level, and a second output signal with the second signal level on the video signals outputted by a third frame. The data driver orderly comprises a third output signal which is lower the first signal level, and a fourth output signal with the first signal level on the video signals outputted by a fourth frame.
Description
Technical field
The present invention particularly quickens the liquid crystal display drive circuit and the driving method of the gray scale of driving (over driving) mode switching liquid crystal display (LCD) relevant for a kind of liquid crystal display drive circuit and driving method relevant for a kind of employing.
Background technology
Known LCD has comprised a plurality of pixels of lining up array-like at present, and the voltage that the liquid crystal in each pixel is added on it is controlled, and can change the transmissivity of liquid crystal, to show required gray scale on the screen.
Fig. 1 represents the schematic equivalent circuit of known LCD panel (liquid crystal display panel is hereinafter to be referred as the LCD plate) and peripheral drive circuit thereof.As shown in the figure, on the LCD plate 1 be by crisscross data electrode (with D1, D2, D3 ... Dm represents) with gate electrode (with G1, G2 ... Gn represents) be interwoven, staggered data electrode and the gate electrode of each group can be used for controlling a display unit, and for example data electrode D1 and gate electrode G1 can be used for controlling display unit 200.As shown in the figure, the equivalent electrical circuit of each display unit mainly comprise control data enter the thin film transistor (TFT) of usefulness (Q11～Q1m, Q21～Q2m ..., Qn1～Qnm) and storage capacitors (C11～C1m, C21～C2m ..., Cn1_Cnm).The grid of thin film transistor (TFT) and drain electrode are connected gate electrode (G1～Gn) and data electrode (D1～Dm) respectively, by the gate electrode (sweep signal on the G1～Gn), can conducting turn-off all thin film transistor (TFT)s in the same delegation (that is same sweep trace), (whether the vision signal on the D1～Dm) can be written in the corresponding display unit to use the control data electrode.Mandatory declaration be the single bright spot on the corresponding LCD plate of each display unit.That is for monochromatic LCD, each display unit is corresponding to single pixel; For color LCD, each display unit then is corresponding single sub-pixel (subpixel), can be respectively red (representing with R), blue (representing with B) or green (representing with G), in other words, the sub-pixel of one group of RGB (three display units) can constitute single pixel.
In addition, in Fig. 1, express the driving circuit section of LCD plate 1 simultaneously.Gate drivers (gate driver) the 10th, according to predetermined scanning sequency, pass out to each gate electrode G1, G2 ..., the sweep signal on the Gn.When being added with sweep signal on a certain gate electrode, can make to be conducting state with the thin film transistor (TFT) in all display units in the delegation or on the same sweep trace.When a certain sweep trace was selected, data driver 20 was according to view data to be shown, via data electrode D1, D2 ... Dm sends corresponding vision signal to m display unit of this row.After gate drivers 10 is finished once the online scan operation of all n line scannings, i.e. the display operation of single frame (frame) is finished in expression.Therefore, each sweep trace of multiple scanning and send vision signal just can reach the purpose of continuous display image.Wherein, signal CPV represents the clock signal of gate drivers 10, and signal CTR then represents the scan control information that gate drivers 10 is received; Signal LD represents data latching (latch) signal of data driver 20, and signal DATA then represents input image information.
Generally data electrode D1, D2, D3 ..., the vision signal that transmitted on the Dm, according to and common electrode voltage VCOM between relation, can be divided into two kinds of positive video signal and negative video signals.Positive video signal is meant that its current potential is higher than common electrode voltage VCOM, and according to the gray-scale value difference of its representative, and actual potential is between voltage Vp1 and voltage Vp2 (general more near common electrode voltage VCOM person corresponding to lower gray-scale value) then.Relatively, negative video signal is meant that its current potential is lower than common electrode voltage VCOM, and according to the gray-scale value difference of its representative, actual potential (similarly, more near common electrode voltage VCOM person corresponding to lower gray-scale value) between voltage Vn1 and voltage Vn2.When same gray-scale value was represented with positive video signal and negative video signal respectively, display effect was the same in principle, but a little difference is in fact still arranged.In addition, be subjected to single polarity electric field bias constantly, cause the liquid crystal molecule life-span to shorten, so the single display unit can receive the vision signal of opposite polarity respectively when odd-numbered frame and even frame in order to prevent liquid crystal molecule.
Consult Fig. 2 A, Fig. 2 A shows the timing diagram of liquid crystal voltage corresponding to each frame.Fig. 2 A is depicted as the sequential of original vision signal, be that 60Hz is an example at this with frame speed (frame rate), so the time of each frame is 16.6ms.At this moment, the stored voltage of storage capacitors (liquid crystal) will slowly reach the voltage that it applied, as shown shown in the dotted line in.
Consult Fig. 2 B, Fig. 2 B shows the timing diagram of liquid crystal voltage corresponding to each frame.Fig. 2 B is depicted as the vision signal shown in above-mentioned Fig. 2 A is handled in the mode of quickening to drive, and its mode is the video level that exports data electrode by the video level adjustment with reference to original first frame and second frame to.By above-mentioned acceleration Driving technique, can accelerate the speed of liquid crystal molecule polar switching, make LCD can show due gray scale more really.
Yet above-mentioned tradition adds speed driving mode, though can accelerate the speed of liquid crystal molecule polar switching, meaning is promptly accelerated the speed of liquid crystal charging.But under the trend that the frame speed of LCD increases day by day; and can't accurately control the voltage that provides to liquid crystal down in the state of high frequency sweep signal; its reason is that the charging curve of liquid crystal is subjected to the influence of many external factors, thereby regular meeting is because overcharge or discharge and cause producing wrong image.If will under the state of high frequency sweep signal, accurately provide liquid crystal correct voltage, then must increase the extra hardware and the calculating and the test of more complexity.
Summary of the invention
In view of this, in order to address the above problem, fundamental purpose of the present invention is to provide a kind of liquid crystal display drive circuit and driving method, reaches the speed of being scheduled to gray-scale value by quickening Driving technique to accelerate liquid crystal molecule, and the correctness that provides to the voltage of liquid crystal can accurately be provided.
For reaching above-mentioned purpose, the present invention proposes a kind of liquid crystal display drive circuit, be applicable to that the image control signal that is provided according to a main frame exports corresponding vision signal to control a LCD panel, LCD driving mechanism comprises gate drivers and data driver.Gate drivers is in order to send sweep signal to gate electrode.Data driver in order to according to the image control signal and outputting video signal to data electrode, vision signal is respectively first signal level and secondary signal level corresponding to the image control signal of first frame and second frame, wherein, when above-mentioned vision signal is driven with accelerated mode, if above-mentioned first signal level is lower than the secondary signal level, then the vision signal exported in the 3rd frame of data driver is in regular turn for to be higher than first output signal of secondary signal level and to have second output signal of secondary signal level, and the vision signal that data driver is exported in the 4th frame is in regular turn for being lower than the 3rd output signal of first signal level and having the 4th output signal of first signal level.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows:
Description of drawings
Fig. 1 represents the schematic equivalent circuit of known tft liquid crystal display board and peripheral drive circuit thereof.
Fig. 2 A shows the timing diagram of liquid crystal voltage corresponding to each frame.
Fig. 2 B is depicted as tradition when the vision signal shown in Fig. 2 A is handled in the mode that quicken to drive liquid crystal voltage is corresponding to the timing diagram of each frame.
Fig. 3 is the schematic equivalent circuit that shows according to the described LCD of the embodiment of the invention.
Fig. 4 shows the vision signal shown in above-mentioned Fig. 2 A with according to the described timing diagram that adds liquid crystal voltage that speed driving mode handles corresponding to each frame of the embodiment of the invention.
Symbol description:
1,3:LCD plate
10,30: gate drivers
20,40: data driver
200,300: display unit
D1, D2, D3 ... Dm: data electrode
G1, G2 ... Gn: gate electrode
Q11～Q1m, Q21～Q2m ..., Qn1～Qnm: thin film transistor (TFT)
C11～C1m, C21～C2m ..., Cn1～Cnm: storage capacitors
Embodiment
Fig. 3 is the schematic equivalent circuit that shows according to the described LCD of the embodiment of the invention.As shown in the figure, on the LCD plate 3 be by crisscross data electrode (with D1, D2, D3 ... Dm represents) with gate electrode (with G1, G2 ... Gn represents) be interwoven, staggered data electrode and the gate electrode of each group can be used for controlling a display unit (display unit), and for example data electrode D1 and gate electrode G1 can be used for controlling display unit 300.As shown in the figure, the equivalent electrical circuit of each display unit mainly comprise control data enter the thin film transistor (TFT) of usefulness (Q11～Q1m, Q21～Q2m ..., Qn1～Qnm) and storage capacitors (C11～C1m, C21～C2m ..., Cn1～Cnm).The grid of thin film transistor (TFT) and drain electrode are connected gate electrode (G1～Gn) and data electrode (D1～Dm) respectively, by the sweep signal on the gate electrode (G1-Gn), can conducting turn-off all thin film transistor (TFT)s in the same delegation (that is same sweep trace), (whether the vision signal on the D1～Dm) can be written in the corresponding display unit to use the control data electrode.Mandatory declaration be the single bright spot on the corresponding LCD plate of each display unit.That is for monochromatic LCD, each display unit is corresponding to single pixel; For color LCD, each display unit then is corresponding single sub-pixel (subpixel), can be respectively red (representing with R), blue (representing with B) or green (representing with G), in other words, the sub-pixel of one group of RGB (three display units) can constitute single pixel.
In addition, in Fig. 3, express driving circuit section simultaneously.Gate drivers (gatedriver) the 30th, according to predetermined scanning sequency, send each gate electrode G1, G2 ..., the sweep signal on the Gn (or claiming scanning impulse).When being added with sweep signal on a certain gate electrode, can make with being conducting state in the delegation or with the thin film transistor (TFT) in online all display units of one scan.When a certain sweep trace was selected, data driver 40 was according to view data to be shown, via data electrode D1, D2 ... Dm sends corresponding vision signal (gray-scale value) to m display unit of this row.
Consult Fig. 2 A, Fig. 2 A shows the timing diagram of liquid crystal voltage corresponding to each frame.Fig. 2 A is depicted as the sequential of original vision signal, be that 60Hz is an example with the frame speed at this, so the time of each frame is 16.6ms.
According to the embodiment of the invention, according to above-mentioned raw video signal in the signal level of first frame and second frame adding the speed driving mode conversion, and provide the period of the 3rd frame, the waveform of the vision signal after the conversion as shown in Figure 4.Fig. 4 shows the timing diagram of liquid crystal voltage corresponding to each frame, and it is to handle according to the described speed driving mode that adds of the embodiment of the invention with the vision signal shown in above-mentioned Fig. 2 A.Consult Fig. 2 A, vision signal is respectively first signal level and secondary signal level corresponding to the image control signal of first frame and second frame, being lower than the secondary signal level with first signal level is example, then in Fig. 4, the vision signal that data driver 40 is exported in the 3rd frame is the second output signal 40B that is higher than the first output signal 40A of secondary signal level and has the secondary signal level in regular turn, and the vision signal that data driver is exported in the 4th frame is the 4th output signal 40D that is lower than the 3rd output signal 40C of first signal level and has first signal level in regular turn.
According to the waveform of above-mentioned vision signal as can be known, if raw video signal will apply the voltage of 8V at the liquid crystal two ends, can be divided into for two stages advances row.At first, at preceding half section of a frame time (is example with the 3rd frame), elder generation provides the signal (first output signal, for example 10V) that is higher than 8V to the liquid crystal charging to add speed driving mode, thus, can accelerate the speed of liquid crystal charging; Next, period second half section of the 3rd frame, to the liquid crystal charging, can avoid the problem that overcharges or can make the liquid crystal that does not reach the target gray scale continue charge or discharge with the 8V signal (second output signal) of original preset.Equally, when liquid crystal reversal of poles, the voltage that will apply 4V with raw video signal at the liquid crystal two ends is example, in preceding half section of the 4th frame, provide the signal (the 3rd output signal, for example 2V) that is lower than 4V that liquid crystal is discharged to add speed driving mode earlier, thus, can accelerate the speed of liquid crystal discharge; Next, period second half section of the 4th frame, 4V signal (the 4th output signal) with original preset discharges to liquid crystal, can avoid the problem of over-discharge can or can make the liquid crystal that does not reach the target gray scale continue charge or discharge, have fine setting before to add the function of the vision signal that speed driving mode handles.As shown in Figure 4, dotted portion is represented the change in voltage situation at liquid crystal two ends, shows that the speed of its variation is fast than conventional art, and can guarantee the last correct gray scale that is rendered as.
After gate drivers 30 is finished once the online scan operation of all n line scannings, i.e. the display operation of single frame (frame) is finished in expression.Therefore, each sweep trace of multiple scanning and send vision signal just can reach the purpose of continuous display image.Wherein, signal CPV represents the clock signal of gate drivers 30, and signal CTR then represents the scan control information that gate drivers 30 is received; Signal LD represents data latching (latch) signal of data driver 40, and signal DATA then represents input image information.
According to the described circuit structure of the embodiment of the invention, can be according to show corresponding image by image control signal that main frame provided.In the present embodiment, provide to the vision signal of data driver 40, can have the effect that quicken to drive, and can overcome, reach purpose of the present invention by this because use and quicken to drive and may cause liquid crystal to overcharge or discharge and the secret worry that produces error image.In addition, employed type of drive in the embodiment of the invention, not needing on the implementation increases too many assembly, is very suitable for the utilization of industry.
Though the present invention with preferred embodiment openly as above; so it is not in order to limit scope of the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can change and improve, so protection scope of the present invention is as the criterion when looking accompanying claim institute restricted portion.
Claims (9)
1. liquid crystal display drive circuit, be applicable to that an image control signal that is provided according to a main frame exports a corresponding vision signal to control a LCD panel, above-mentioned LCD panel comprises multi-aspect unit, connect corresponding multidata electrode and multiple-grid utmost point electrode respectively, above-mentioned LCD driving mechanism comprises:
One gate drivers is in order to send sweep signal to above-mentioned gate electrode; And
One data driver, in order to export above-mentioned vision signal according to above-mentioned image control signal to above-mentioned data electrode, above-mentioned vision signal is respectively first signal level and secondary signal level corresponding to the above-mentioned image control signal of first frame and second frame,
Wherein, when above-mentioned vision signal is driven with accelerated mode, if above-mentioned first signal level is lower than the secondary signal level, the vision signal that then above-mentioned data driver is exported in the 3rd frame comprises first output signal that is higher than above-mentioned secondary signal level and second output signal with above-mentioned secondary signal level, and the vision signal that above-mentioned data driver is exported in the 4th frame comprises the 3rd output signal that is lower than above-mentioned first signal level and the 4th output signal with above-mentioned first signal level.
2. liquid crystal display drive circuit according to claim 1, wherein above-mentioned first output signal and the 3rd output signal level are decided according to the relation of above-mentioned first signal level and secondary signal level.
3. liquid crystal display drive circuit according to claim 2, the width of wherein above-mentioned first output signal, second output signal, the 3rd output signal and the 4th output signal is identical.
4. LCD is applicable to the image control signal that is provided according to a main frame and display image comprises:
One LCD panel comprises multi-aspect unit, connects corresponding multidata electrode and multiple-grid utmost point electrode respectively;
One gate drivers is in order to send sweep signal to above-mentioned gate electrode; And
One data driver, in order to export above-mentioned vision signal according to above-mentioned image control signal to above-mentioned data electrode, above-mentioned vision signal is respectively first signal level and secondary signal level corresponding to the above-mentioned image control signal of first frame and second frame,
Wherein, when above-mentioned vision signal is driven with accelerated mode, if above-mentioned first signal level is lower than the secondary signal level, the vision signal that then above-mentioned data driver is exported in the 3rd frame comprises first output signal that is higher than above-mentioned secondary signal level and second output signal with above-mentioned secondary signal level, and the vision signal that above-mentioned data driver is exported in the 4th frame comprises the 3rd output signal that is lower than above-mentioned first signal level and the 4th output signal with above-mentioned first signal level.
5. liquid crystal display drive circuit according to claim 4, wherein above-mentioned first output signal and the 3rd output signal level are decided according to the relation of above-mentioned first signal level and secondary signal level.
6. liquid crystal display drive circuit according to claim 5, the width of wherein above-mentioned first output signal, second output signal, the 3rd output signal and the 4th output signal is identical.
7. LCD panel driving method, be applicable to that an image control signal that is provided according to a main frame exports a corresponding vision signal to control a LCD panel, above-mentioned LCD panel comprises multi-aspect unit, connect corresponding multidata electrode and multiple-grid utmost point electrode respectively, above-mentioned LCD panel driving method comprises the following steps:
Send sweep signal to above-mentioned gate electrode; And
Export above-mentioned vision signal to above-mentioned data electrode according to above-mentioned image control signal, above-mentioned vision signal is respectively first signal level and secondary signal level corresponding to the above-mentioned image control signal of first frame and second frame,
Wherein, when above-mentioned vision signal is driven with accelerated mode, if above-mentioned first signal level is lower than the secondary signal level, then the vision signal in the 3rd frame comprises first output signal that is higher than above-mentioned secondary signal level and second output signal with above-mentioned secondary signal level, and comprises the 3rd output signal that is lower than above-mentioned first signal level and the 4th output signal with above-mentioned first signal level in the vision signal that the 4th frame is exported.
8. LCD panel driving method according to claim 7, wherein above-mentioned first output signal and the 3rd output signal level are decided according to the relation of above-mentioned first signal level and secondary signal level.
9. LCD panel driving method according to claim 8, the width of wherein above-mentioned first output signal, second output signal, the 3rd output signal and the 4th output signal is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02123264 CN1272762C (en) | 2002-06-17 | 2002-06-17 | Liquid crystal display drive circuit and the liquid crystal display thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02123264 CN1272762C (en) | 2002-06-17 | 2002-06-17 | Liquid crystal display drive circuit and the liquid crystal display thereof |
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| CN1464499A CN1464499A (en) | 2003-12-31 |
| CN1272762C true CN1272762C (en) | 2006-08-30 |
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| CN 02123264 Expired - Fee Related CN1272762C (en) | 2002-06-17 | 2002-06-17 | Liquid crystal display drive circuit and the liquid crystal display thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101182770B1 (en) * | 2006-06-12 | 2012-09-14 | 삼성디스플레이 주식회사 | Gate driving circuit and display device having the same |
| CN101620831B (en) * | 2008-07-04 | 2011-12-28 | 奇景光电股份有限公司 | Driving mechanism of multiple-fold gate LCD |
| CN102054419B (en) * | 2009-10-28 | 2013-04-24 | 无锡夏普电子元器件有限公司 | Display panel drive device and method as well as image display device |
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