CN1632647A - Liquid crystal display and display method thereof - Google Patents
Liquid crystal display and display method thereof Download PDFInfo
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- CN1632647A CN1632647A CN 200410081962 CN200410081962A CN1632647A CN 1632647 A CN1632647 A CN 1632647A CN 200410081962 CN200410081962 CN 200410081962 CN 200410081962 A CN200410081962 A CN 200410081962A CN 1632647 A CN1632647 A CN 1632647A
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Abstract
It is a LCD device and its display method, wherein, the LCD device has a display panel, adjusting circuit and driving circuit and the display panel has a common electrode. The adjusting circuit is connected electronically with the common electrode and outputs distribution parameters according to the voltage distribution of the common electrode. The driving circuit receives the distribution parameters to drive the display panel. The adjusting circuit comprises voltage comparer and compensation circuit, wherein the voltage comparer is to measure the voltage difference between both ends of the common electrode and the compensation circuit is to get the distribution parameters according to voltage difference.
Description
Technical field
The present invention relates to a kind of LCD and display packing thereof, particularly a kind of LCD and display packing thereof that compensates the variation of public electrode.
Background technology
General liquid crystal panel has public electrode (Common electrode), pixel electrode (Pixelelectrode) and the liquid crystal layer between public electrode and pixel electrode.By applying public electrode voltages, and apply pixel voltage, promptly can utilize the voltage difference between public electrode and pixel electrode and change the light transmittance of liquid crystal layer to pixel electrode to public electrode.
The light transmittance of liquid crystal layer be with public electrode and pixel electrode between the voltage extent relevant, and the polarity of voltage difference is irrelevant therewith.If the voltage that is continuously applied same polarity to liquid crystal layer, is easy to generate the problem that image ossifys, and generally is to avoid this problem in the mode of reversal of poles therefore.As Fig. 1, it illustrates is the light transmittance I graph of relation of pixel voltage V and liquid crystal molecule.The positive polarity pixel voltage Vp and the negative polarity pixel voltage Vn that are symmetrical in public electrode voltages level Vcom all can reach identical light transmittance Ix.Therefore by reversal of poles, with the alternating voltage ground driving liquid crystal layer of opposed polarity, the problem that can avoid image to ossify.
Yet public electrode still has impedance, makes that the public electrode voltages of each point can't remain on identical public electrode voltages level Vcom on the public electrode.Therefore, the positive polarity on the pixel electrode and the pixel voltage of negative polarity, for example above-mentioned Vp and Vn can't cause identical voltage difference on liquid crystal layer.This will make that the actual electrical pressure reduction between public electrode and pixel electrode is not that predetermined target voltage is poor, and the problem that causes image to ossify and glimmer makes display quality reduce.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of LCD and display packing thereof exactly, to solve throwing into question of public electrode voltages decay.
According to a purpose of the present invention, a kind of display packing of LCD is proposed.LCD comprises display panel and driving circuit.Display panel is to have public electrode.Display packing is described below.Voltage according to the public electrode voltages on the public electrode distributes and the output distribution parameter.Driving circuit according to distribution parameter to drive display panel.Wherein exporting in the step of distribution parameter, is to obtain distribution parameter by a voltage difference of measuring the public electrode two ends.
According to another object of the present invention, a kind of LCD is proposed, it comprises display panel, adjusts circuit and driving circuit.Display panel is to have public electrode.Adjust circuit and electrically connect with public electrode, and according to the voltage distribution of the public electrode voltages on the public electrode and export a distribution parameter.Driving circuit receives distribution parameter and drives display panel according to this.Wherein adjust circuit and more comprise voltage comparator and compensating circuit.Voltage comparator is in order to measure the voltage difference at public electrode two ends.Compensating circuit according to voltage difference to obtain distribution parameter.
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 below.
Description of drawings
Fig. 1 is the light transmittance I graph of relation of pixel voltage V and liquid crystal molecule.
It is display packing process flow diagram according to a kind of LCD of preferred embodiment of the present invention that Fig. 2 illustrates.
It is block diagram according to a kind of LCD of a preferred embodiment of the present invention that Fig. 3 illustrates.
It is the graph of a relation of positive-negative polarity pixel voltage and public electrode voltages level that Fig. 4 illustrates.
It is common figure electrode voltage distribution schematic diagram on the public electrode that Fig. 5 illustrates.
It is block diagram according to a kind of LCD of another preferred embodiment of the present invention that Fig. 6 illustrates.
It is the diagram that concerns of pixel voltage and GTG value that Fig. 7 illustrates.
The reference numeral explanation
200,400: LCD
202: display panel
204,404: adjust circuit
206,406: sequential control circuit
208 (1)-208 (N): chip for driving
210: public electrode
212,412: voltage comparator
214,414: compensating circuit
216,416: driving circuit
218: voltage adjuster
Embodiment
Please refer to Fig. 2, it illustrates is display packing process flow diagram according to a kind of LCD of preferred embodiment of the present invention.At first, enter step 602, measure the voltage difference at public electrode two ends.Then, enter step 604, according to voltage difference to obtain distribution parameter.At last, enter step 606, according to distribution parameter to drive display panel.Furthermore, the driving circuit of LCD is to adjust the display panels that the GTG value also drives LCD according to this according to distribution parameter.Perhaps, when driving circuit had a plurality of chip for driving, each chip for driving was except can be according to distribution parameter to adjust the decay of GTG value with the compensation public electrode voltages, because the corresponding separately one group of gamma voltage of each chip for driving.So, do not changing under the GTG value situation, driving circuit more can be adjusted these group gamma voltages according to distribution parameter so that each chip for driving according to adjusted gamma voltage to drive display panel, with the decay of compensation public electrode voltages.So, no matter all can solve in traditional procedure for displaying the problem that common electrode voltage attenuation is on business caused by adjusting GTG value or gamma voltage.
A nearlyer step please refer to Fig. 3, and it illustrates is block diagram according to a kind of LCD of a preferred embodiment of the present invention.LCD 200 comprises display panels 202, adjusts circuit 204 and driving circuit 216.Display panels 202 has public electrode 210.Adjust circuit 204 and comprise voltage comparator 212 and compensating circuit 214.Voltage comparator 212 electrically connects with public electrode 210, in order to measure public electrode 210 two ends, and A point and the B voltage difference delta V of ordering for example.Compensating circuit 214 is according to this voltage difference delta V output distribution parameter ADJ.Driving circuit 216 more comprises sequential control circuit 206 and a plurality of chip for driving 208 (1)-208 (N).Sequential control circuit 206 receive pixel data data and according to distribution parameter ADJ to produce a plurality of GTG value G (1)-G (N).And the corresponding separately one group of gamma voltage of each chip for driving 208 (1)-208 (N).Each group gamma voltage is expression one gamma curve, for example chip for driving 208 (1) is according to the GTG value G (1) that is received, and with reference to corresponding gamma curve (not being painted among Fig. 3), for example gamma curve that Fig. 1 painted, and produce corresponding pixel voltage, to drive display panels 202.
Suppose that the pixel that the A that corresponds to public electrode 210 is ordered is P (A) (not being indicated among Fig. 3), corresponding to the pixel that B orders is P (B) (not being indicated among Fig. 3).Traditionally, if will make pixel P (A) and P (B) show identical brightness, for example this brightness is by pairing chip for driving corresponding to a certain GTG value GX, for example 208 (1) and 208 (N) produce identical brightness according to this GTG value GX to drive pixel P (A) and P (B).Just pixel P (A) and P (B) drive by identical pixel voltage (positive polarity pixel voltage Vp (GX) and negative polarity pixel voltage Vn (GX)), can make pixel P (A), P (B) show identical brightness ideally.
Please be simultaneously with reference to Fig. 4, it illustrates is the graph of a relation of positive-negative polarity pixel voltage and public electrode voltages level.Yet, because the two ends of public electrode 210 have voltage difference delta V, so the pairing public electrode voltages of pixel P (A) is public electrode voltages level Vcom, the pairing public electrode voltages of pixel P (B) is that public electrode voltages level Vcom subtracts voltage difference delta V, i.e. Vcom-Δ V.So the positive polarity voltage of pixel P (A) is poor, and (order of magnitude of Vp (GX)-Vcom) poor with reverse voltage (Vcom-Vn (GX)) is identical, so positive polarity voltage Vp (GX) can produce identical light transmittance at pixel P (A) with reverse voltage Vn (GX).
But if apply identical positive polarity pixel voltage Vp (GX) to pixel P (B), the positive polarity voltage difference of pixel P (B) is (Vp (GX)-Vcom+ Δ V), compared with the positive polarity voltage difference of pixel P (A) also high Δ V, so pixel P (B) can be also brighter than pixel P (A); If apply negative polarity pixel voltage Vn (GX) to pixel P (B), its reverse voltage difference is (Vcom-Δ V-Vn (GX)), has also lacked Δ V compared with the reverse voltage difference of pixel P (A), so pixel P (B) can be also darker than pixel P (A).So, in reversal of poles, the problem that just can produce flicker and have image to ossify.
Therefore the spirit of the embodiment of the invention is to distribute to adjust the pixel voltage corresponding to each pixel on the display panel according to the voltage of the public electrode voltages on the public electrode 210.Just, the positive polarity voltage difference of adjustment pixel P (B) is identical with the reverse voltage difference.As shown in Figure 4, the positive polarity pixel voltage with pixel P (B) is adjusted into Vp ' (GX)=(Vp (GX)-Δ V); The negative polarity pixel voltage is adjusted into Vn ' (GX)=(Vn (GX)-Δ V), can makes that the positive polarity voltage difference of pixel P (B) is identical with the reverse voltage difference, to solve in traditional procedure for displaying the problem that common electrode voltage attenuation is on business caused.
Furthermore, please refer to Fig. 5, it illustrates is the distribution schematic diagram of the public electrode voltages on the public electrode, and the longitudinal axis is that public electrode voltages is a unit with volt V, and transverse axis is the each point position on the public electrode 210.At the A of public electrode 210 point, the public electrode voltages of measuring is public electrode voltages level Vcom, and the public electrode voltages that the B point of its other end is measured is (Vcom-Δ V).Therefore the A point can be estimated with oblique line L to the pairing public electrode voltages of any point X (X) between the B point, just:
Public electrode voltages (X)=Vcom-Δ V*D (X, A)/D (B, A) (1)
Wherein, D is a distance function, and D (X, A) expression X is to the distance of A, and (B, A) expression B is to the distance of A for D.For example the C point is positioned at the centre that A point and B are ordered, and therefore, its public electrode voltages is (Vcom-Δ V/2).So by voltage comparator 212 measure public electrodes 210 two ends, A point and B point, voltage difference delta V, can obtain the slope that the public electrode voltages of the horizontal direction of public electrode 210 changes according to this voltage difference delta V by compensating circuit 214 again, and try to achieve the skew of the public electrode voltages of each point, just distribution parameter ADJ according to this.In the present embodiment, be the change in voltage of only measuring the horizontal direction of public electrode 210, the change in voltage of its vertical direction is very little, is to be assumed to be zero and do not consider.So utilize spirit of the present invention still can easily the change in voltage of horizontal direction and vertical direction be listed in and consider, do not repeat them here.
Therefore, try to achieve the side-play amount of public electrode voltages of each point after, can compensate according to this, make pixel P (B) have in its public electrode voltages under the situation of skew, the positive polarity voltage difference of its pixel voltage is still kept identical size with the reverse voltage difference.So the GTG value G that is exported by sequential control circuit 206 adjustment is with the skew of the public electrode voltages of compensation public electrode 210.
Penalty method with the GTG value elaborates again.At the display panel 202 of present embodiment is to be 0 o'clock with the pixel voltage and the public electrode voltages difference that drive pixel, and brightness the maximum is that example is done explanation.Because the positive polarity pixel voltage of pixel P (B) is required to be Vp ' (GX)=(Vp (GX)-Δ V), this value is littler than Vp (GX), so the GTG value GX of pixel P (B) correspondence should increase to (GX+ Δ g), and wherein Δ g determines corresponding to voltage difference delta V.The negative polarity pixel voltage of pixel P (B) is required to be Vn ' (GX)=(Vn (GX)-Δ V) in addition, and the absolute value of this value is bigger than Vn (GX), so its corresponding GTG value GX should be reduced to (GX-Δ g).So corresponding to pixel P (B), the voltage difference delta V that sequential control circuit 206 is just ordered according to A, B is different GTG value (GX+ Δ g), (the GX-Δ g) of output when positive-negative polarity, so that the positive and negative polarity pixel voltage Vp ' of adjusted pixel P (B) (GX), the public electrode voltages that (GX) is symmetrical in after the skew of Vn ' is Vcom-Δ V, and then makes pixel P (B) and pixel P (A) show identical brightness.
Coming the penalty method with gamma curve again is that example is done explanation.Please refer to Fig. 6, it illustrates is block diagram according to a kind of LCD of another preferred embodiment of the present invention.LCD 400 comprises display panel 202, adjusts circuit 404 and driving circuit 416.Display panel 202 has public electrode 210.Adjust circuit 204 and comprise voltage comparator 412 and compensating circuit 414.Voltage comparator 412 electrically connects with public electrode 210, in order to measure public electrode 210 two ends, and A point and the B voltage difference delta V of ordering for example.Compensating circuit 414 is according to this voltage difference delta V output distribution parameter ADJ '.Driving circuit 416 more comprises sequential control circuit 406, a plurality of chip for driving 208 (1)-208 (N) and voltage adjuster 218 (1)-218 (N).Because each chip for driving 208 (1)-218 (N) is to receive one group of gamma voltage, and chip for driving 208 (1)-218 (N) according to corresponding gamma curve g (1)-g (N) and GTG value G (1)-G (N) with output pixel voltage.Therefore, change the gamma voltage that each chip for driving 208 (1)-208 (N) is received, just can under the situation of not adjusting GTG value G (1)-G (N), change pixel voltage, compensate with side-play amount to public electrode voltages.Therefore, utilizing the approach of gamma voltage compensation is the LCD 400 that is applicable to many chip for driving 208 (1)-208 (N).Each chip for driving 208 (1)-208 (N) is respectively in order to drive the data line of multirow, for example, chip for driving 208 (1) is in order to drive the first area of display panel 202, it comprises data line 1-384 (being not shown among Fig. 6), chip for driving 208 (2) is in order to drive the second area of display panel 202, it comprises it for example being data line 385-769 (being not shown among Fig. 6), and the rest may be inferred, each chip for driving 208 each self-driven different zone.And the side-play amount of each regional public electrode voltages is to be got by the mean value of the side-play amount of public electrode voltages in the zone.
Please refer to Fig. 7, it illustrates is the diagram that concerns of pixel voltage and GTG value, and the longitudinal axis is represented GTG value G, and transverse axis remarked pixel voltage is unit with volt V.With gamma curve g (1) is example, and it is the curve before not adjusting, and it is symmetrical in public electrode voltages level Vcom, be in this example to be applicable to the first area, and the zone at A point place just, the mean value of the side-play amount of its interior public electrode voltages in zone is assumed to be 0.When GTG value G was assumed to be GX, the positive polarity pixel voltage of pixel P (A) was Vp (GX), and the negative polarity pixel voltage is Vn (GX).And gamma curve g (N) is used for N zone, for example is the zone of pixel P (B), and the mean value of the side-play amount of public electrode voltages is assumed to be Δ V ' in its zone.When GTG value G was GX, voltage comparator 212 was according to the voltage difference delta V of two ends (A, B).Calculate Δ V ' via compensating circuit 214, with the adjustment parameter A DJ ' that obtains.Voltage adjuster 218 (N) is just thought gamma curve g (N) according to a resistance gamma voltage of adjusting after parameter A DJ ' the output compensation, is Vp '=Vp-Δ V ' with the positive polarity pixel voltage of compensation pixel P (B), and the negative polarity pixel voltage is Vn '=Vn-Δ V '.Make positive and negative polarity voltage Vp ', the Vn ' of pixel P (B) still can be symmetrical in the public electrode voltages after the skew.
Disclosed LCD of the above embodiment of the present invention and display packing thereof, can by public electrode voltages on public electrode voltage difference and obtain a distribution parameter, and carry out GTG value compensation or gamma curve compensation according to this.So,, obtain the pixel voltage of different adjusting ranges, compensate the skew of public electrode voltages at the side-play amount of the different common voltage of each position of display panel.So the present invention can effectively improve the flicker of LCD screen or the problem that image ossifys.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (10)
1. LCD comprises:
One display panel is to have a public electrode;
One adjusts circuit, electrically connects with this public electrode, and distributes and export a distribution parameter according to the voltage of the public electrode voltages on this public electrode; And
One drive circuit receives this distribution parameter and drives this display panel according to this.
2. LCD as claimed in claim 1, wherein, this adjustment circuit comprises:
One voltage comparator is in order to measure a voltage difference at these public electrode two ends; And
One compensating circuit, according to this voltage difference to obtain this distribution parameter.
3. LCD as claimed in claim 1, wherein, this driving circuit be according to this distribution parameter adjusting a plurality of GTG values, this driving circuit according to described GTG value to drive this liquid crystal panel.
4. LCD as claimed in claim 1, wherein, this driving circuit more comprises a plurality of chip for driving, the corresponding separately one group of gamma voltage of described chip for driving, each described chip for driving according to this group gamma voltage of correspondence and corresponding a plurality of GTG values to drive this liquid crystal panel.
5. LCD as claimed in claim 4, wherein, this driving circuit more comprises a plurality of voltage adjusters, described voltage adjuster is and corresponding described chip for driving electrically connects, described voltage adjuster according to this distribution parameter to adjust described each self-corresponding this group gamma voltage of chip for driving.
6. the display packing of a LCD, this LCD comprises a display panel and one drive circuit, and this display panel has a public electrode, and this method comprises:
Distribute and export a distribution parameter according to the voltage of the public electrode voltages on this public electrode; And
This driving circuit according to this distribution parameter to drive this display panel.
7. method as claimed in claim 6 wherein, in the step of this distribution parameter of output, is to obtain this distribution parameter by a voltage difference of measuring these public electrode two ends.
8. method as claimed in claim 6, wherein, in driving the step of this display panel, this driving circuit be according to this distribution parameter adjusting a plurality of GTG values, this driving circuit according to described GTG value to drive this display panel.
9. method as claimed in claim 6, wherein, this driving circuit more comprises a plurality of chip for driving, the corresponding separately one group of gamma voltage of described chip for driving.
10. method as claimed in claim 9, wherein, this driving circuit more comprises a plurality of voltage adjusters, and in the step that drives this display panel, described voltage adjuster is to adjust described each self-corresponding this group gamma voltage of chip for driving according to this distribution parameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100819620A CN100489604C (en) | 2004-12-30 | 2004-12-30 | Liquid crystal display and display method thereof |
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| CNB2004100819620A CN100489604C (en) | 2004-12-30 | 2004-12-30 | Liquid crystal display and display method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100443965C (en) * | 2005-12-16 | 2008-12-17 | 群康科技(深圳)有限公司 | Liquid-crystal display device, its driving circuit and method |
| US7990363B2 (en) | 2006-12-01 | 2011-08-02 | Chimei Innolux Corporation | Common voltage adjusting method for liquid crystal display |
| CN102467862A (en) * | 2010-11-17 | 2012-05-23 | 京东方科技集团股份有限公司 | Voltage regulation method and device of liquid crystal display panel |
| CN102930844A (en) * | 2012-11-12 | 2013-02-13 | 京东方科技集团股份有限公司 | Display device and adjusting method of data voltage |
| CN104376823A (en) * | 2014-09-30 | 2015-02-25 | 南京中电熊猫液晶显示科技有限公司 | Gamma voltage regulating device and method |
| WO2016078114A1 (en) * | 2014-11-21 | 2016-05-26 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and grayscale voltage compensation method thereof |
| WO2016173138A1 (en) * | 2015-04-28 | 2016-11-03 | 京东方科技集团股份有限公司 | Compensation circuit and drive circuit and working method therefor, and display device |
| CN109461423A (en) * | 2019-01-14 | 2019-03-12 | 合肥京东方显示技术有限公司 | Gray scale drives table creating device and method, display panel and driving method |
| CN109872701A (en) * | 2019-04-22 | 2019-06-11 | 京东方科技集团股份有限公司 | Source electrode voltage adjusting method, display module and liquid crystal screen |
| WO2021092994A1 (en) * | 2019-11-15 | 2021-05-20 | Tcl华星光电技术有限公司 | Driving method, display panel and display device |
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- 2004-12-30 CN CNB2004100819620A patent/CN100489604C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100443965C (en) * | 2005-12-16 | 2008-12-17 | 群康科技(深圳)有限公司 | Liquid-crystal display device, its driving circuit and method |
| US7990363B2 (en) | 2006-12-01 | 2011-08-02 | Chimei Innolux Corporation | Common voltage adjusting method for liquid crystal display |
| CN102467862A (en) * | 2010-11-17 | 2012-05-23 | 京东方科技集团股份有限公司 | Voltage regulation method and device of liquid crystal display panel |
| CN102467862B (en) * | 2010-11-17 | 2014-08-27 | 京东方科技集团股份有限公司 | Voltage regulation method and device of liquid crystal display panel |
| US9208735B2 (en) | 2010-11-17 | 2015-12-08 | Boe Technology Group Co., Ltd. | Voltage adjustment method and apparatus of liquid crystal display panel |
| CN102930844A (en) * | 2012-11-12 | 2013-02-13 | 京东方科技集团股份有限公司 | Display device and adjusting method of data voltage |
| CN104376823A (en) * | 2014-09-30 | 2015-02-25 | 南京中电熊猫液晶显示科技有限公司 | Gamma voltage regulating device and method |
| CN104376823B (en) * | 2014-09-30 | 2017-03-29 | 南京中电熊猫液晶显示科技有限公司 | Gamma electric voltage adjusting means and method |
| GB2547850B (en) * | 2014-11-21 | 2021-09-29 | Shenzhen China Star Optoelect | Liquid crystal display panel and grayscale voltage compensating method thereof |
| WO2016078114A1 (en) * | 2014-11-21 | 2016-05-26 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and grayscale voltage compensation method thereof |
| US9721515B2 (en) | 2014-11-21 | 2017-08-01 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Liquid crystal display panel and grayscale voltage compensating method thereof |
| GB2547850A (en) * | 2014-11-21 | 2017-08-30 | Shenzhen China Star Optoelect | Liquid crystal display panel and grayscale voltage compensation method thereof |
| WO2016173138A1 (en) * | 2015-04-28 | 2016-11-03 | 京东方科技集团股份有限公司 | Compensation circuit and drive circuit and working method therefor, and display device |
| US10083670B2 (en) | 2015-04-28 | 2018-09-25 | Boe Technology Group Co., Ltd. | Compensation circuit, drive circuit and operating methods thereof, as well as display device |
| CN109461423A (en) * | 2019-01-14 | 2019-03-12 | 合肥京东方显示技术有限公司 | Gray scale drives table creating device and method, display panel and driving method |
| CN109461423B (en) * | 2019-01-14 | 2020-11-10 | 合肥京东方显示技术有限公司 | Gray scale driving table generation device and method, display panel and driving method |
| US11183131B2 (en) | 2019-01-14 | 2021-11-23 | Hefei Boe Display Technology Co., Ltd. | Device for generating gray-scale drive table and method thereof, display panel and method for driving the same |
| CN109872701A (en) * | 2019-04-22 | 2019-06-11 | 京东方科技集团股份有限公司 | Source electrode voltage adjusting method, display module and liquid crystal screen |
| WO2021092994A1 (en) * | 2019-11-15 | 2021-05-20 | Tcl华星光电技术有限公司 | Driving method, display panel and display device |
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| CN100489604C (en) | 2009-05-20 |
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