CN101419790B - Driving method for liquid crystal display device - Google Patents
Driving method for liquid crystal display device Download PDFInfo
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- CN101419790B CN101419790B CN2008102040493A CN200810204049A CN101419790B CN 101419790 B CN101419790 B CN 101419790B CN 2008102040493 A CN2008102040493 A CN 2008102040493A CN 200810204049 A CN200810204049 A CN 200810204049A CN 101419790 B CN101419790 B CN 101419790B
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Abstract
The invention relates to a method for driving a liquid crystal display (LCD) device, and the LCD device comprises m lines and n rows of display pixels as well as one row or a plurality of rows of virtual pixels, and each of the pixels is controlled by a thin film transistor, each line of pixels are connected with a scanning beam, each row of display pixels are connected with a data link, and each row of virtual pixels are connected with a compensating data link, wherein, compensating data is generated for each line of pixels according to the whole polarity of the display data; the polarity of the compensating data is opposite to the whole polarity of the line of display data, wherein, m and n are signless integral. The method for driving the LCD device can improve the defect caused by the coupling of public voltage and enhance the display quality.
Description
Technical field
The present invention relates to a kind of driving method of liquid crystal indicator, particularly relate to a kind of driving method that improves the liquid crystal indicator of common electric voltage coupling.
Background technology
Recent years, significant variation has taken place in display technique.Traditional CRT monitor is little by little replaced by flat-panel monitor, and wherein modal flat-panel monitor is exactly Thin Film Transistor-LCD (TFT-LCD).
The equivalent electrical circuit of the pixel of a liquid crystal indicator is as shown in Figure 1: be made up of thin film transistor (TFT) (TFT) Tr, liquid crystal capacitance Clc, storage capacitors Cst, data line Dn, sweep trace Gn.One end of liquid crystal capacitance connects the drain electrode of transistor Tr, and the other end connects common electric voltage Vcom; Cgd is the coupling capacitance between transistor Tr grid and the drain electrode.Owing to have the spuious coupling capacitance of liquid crystal capacitance and memory capacitance and other between common electric voltage Vcom and pixel voltage, because the coupling of these electric capacity, the variation of pixel voltage will inevitably cause the variation of common electric voltage Vcom.Owing to be carried in the difference that voltage on the liquid crystal capacitance equals pixel voltage and common electric voltage Vcom, so the Vcom change in voltage can cause voltage and target voltage on the liquid crystal capacitance variant, and therefore the display frame quality can descend.
In the TFT-LCD production run, can use some special patterns to remove to check the display quality of TFT-LCD.For example: picture shown in Figure 2 can check that TFT-LCD common electric voltage Vcom is by the display quality after the pixel voltage coupling.Picture comprises the black vertical line of rgb pixel, the alternate composition of grey vertical line that many comprise rgb pixel by many.The data-signal of certain delegation of picture correspondence because negative polarity is bigger than normal, so the integral polarity of this delegation is partial to negative polarity, also is partial to negative polarity for the coupling effect of common electric voltage as shown in Figure 3, and promptly the common electric voltage after the coupling forces down than normal common electrical.Then for the negative polarity data in original grey vertical line (being green data), and the difference between the common electric voltage diminishes, that is to say the voltage decreases that is carried on the green pixel liquid crystal capacitance, TFT-LCD for normally white, voltage decreases, the light that sees through on the respective pixel increases, and brightness brightens.And because human eye is relatively more responsive to green, therefore being easy to just observe has the green that should not show on the picture.More than being common electric voltage Vcom, to be coupled the demonstration that causes bad.
Summary of the invention
Technical matters to be solved by this invention provides a kind of driving method of liquid crystal indicator, can improve because that coupling of public voltage caused was bad, improves display quality.
The present invention solves the problems of the technologies described above the driving method that the technical scheme that adopts provides a kind of liquid crystal indicator, described liquid crystal indicator comprises the capable n row of m display pixel, one row or multiple row virtual pixel, each pixel is controlled by a thin film transistor (TFT), each row pixel links to each other with a sweep trace, each row display pixel pixel links to each other with a data line, each row virtual pixel links to each other with an offset data line, wherein, to each row pixel,, generate offset data according to the integral polarity of video data, the integral polarity of the polarity of described offset data and this row video data is opposite, m, n is a positive integer.
In the driving method of above-mentioned liquid crystal indicator, the electric capacity of described virtual pixel is greater than the electric capacity of display pixel.
In the driving method of above-mentioned liquid crystal indicator, described virtual pixel is row, and the electric capacity of described virtual pixel is 5 times of electric capacity of display pixel; The raceway groove length breadth ratio of the thin film transistor (TFT) of described virtual pixel is 5 times of raceway groove length breadth ratio of the thin film transistor (TFT) of display pixel.
In the driving method of above-mentioned liquid crystal indicator, described virtual pixel is two row, and the electric capacity of each virtual pixel is 2.5 times of electric capacity of display pixel; The raceway groove length breadth ratio of the thin film transistor (TFT) of each virtual pixel is 2.5 times of raceway groove length breadth ratio of the thin film transistor (TFT) of display pixel.
The present invention contrasts prior art following beneficial effect: the driving method of liquid crystal indicator provided by the invention, by signal that virtual pixel is afforded redress, improvement is bad owing to what coupling of public voltage caused, improves display quality.
Description of drawings
Fig. 1 is the pixel equivalent circuit figure of liquid crystal indicator.
Fig. 2 checks picture view.
Fig. 3 is the coupling of public voltage synoptic diagram.
Fig. 4 is a TFT panel construction synoptic diagram one of the present invention.
Fig. 5 is a TFT panel construction synoptic diagram two of the present invention.
Fig. 6 is a TFT panel construction synoptic diagram three of the present invention.
Fig. 7 is the signal graph of offset data line of the present invention.
Fig. 8 is the generation process flow diagram of offset data signal of the present invention.
Among the figure:
1 time schedule controller, 2 gate drivers
3 data drivers, 4 TFT panels
5 each line data integral polarity 6 offset data polarity
Embodiment
The invention will be further described below in conjunction with accompanying drawing and exemplary embodiments.
The liquid crystal indicator that the present invention uses comprises the capable n row of m display pixel, and each pixel is controlled by a thin film transistor (TFT), and each row pixel links to each other with a sweep trace, and each row display pixel pixel links to each other with a data line.See also Fig. 4, each pixel is by a thin film transistor (TFT) (TFT), and each row pixel links to each other with a sweep trace, sweep trace G1, G2 ... Gm provides sweep signal by gate drivers 2, and each row pixel links to each other data line D1 with a data line, D2 ... Dn provides data-signal by data driver 3, wherein, data line D1, D2 ... Dn and sweep trace G1, G2 ... the Gm square crossing is arranged, and gate drivers 2 and data driver 3 are driven by time schedule controller 1 respectively.
The liquid crystal indicator that the present invention uses increases row or k row virtual pixel (k≤4 and be positive integer) in the both sides of TFT panel 4, each row virtual pixel links to each other with an offset data line.The liquid crystal capacitance of virtual pixel and memory capacitance sum are greater than liquid crystal capacitance and the memory capacitance sum that shows with pixel.The concrete setting of virtual pixel sees also Fig. 4～6.
As shown in Figure 4: the right side at TFT panel 4 increases by 1 offset data line dummy1, and the left side does not increase the offset data line.The liquid crystal capacitance of the last virtual pixel of offset data line dummy1 and liquid crystal capacitance that the memory capacitance sum is normal display pixel and 5 times of memory capacitance sum, for example at 26 cun, resolution is among the TFT-LCD of 1366X768, the liquid crystal capacitance of a normal display pixel and memory capacitance sum are 0.1pF, and then these two electric capacity sums of pixel then are designed to 0.5pF on the offset data line.In order to increase the capacitance of virtual pixel, can increase the area of virtual pixel or the area of memory capacitance.After the electric capacity of virtual pixel increases,, can recently increase the speed of charging by the raceway groove length and width that increase TFT in order not influence charging rate.That is to say that the raceway groove length breadth ratio of the TFT that virtual pixel is included also is 5 times of the raceway groove length breadth ratio of the TFT that comprises in the normal pixel.Be example with 26 cun TFT-LCD still, if the length breadth ratio of its normal display pixel 20/5, then the length breadth ratio of pixel TFT then is 100/5 on the offset data line.Can guarantee that like this offset data voltage can normally be filled among the liquid crystal capacitance and memory capacitance of virtual pixel.
As shown in Figure 5: the right side at TFT panel 4 increases by 2 offset data line dummy1, dummy2.The liquid crystal capacitance of offset data line dummy1, the last virtual pixel of dummy2 and memory capacitance sum are the liquid crystal capacitance of normal display pixel and 2.5 times of memory capacitance sum, for example in 26 cun TFT-LCD, the liquid crystal capacitance of a normal display pixel and memory capacitance sum are 0.1pF, and then these two electric capacity sums of the last pixel of offset data line dummy1 and dummy2 then are designed to 0.25pF.In addition, the raceway groove length breadth ratio of the included TFT of this pixel also is 2.5 times of the raceway groove length breadth ratio of the TFT that comprises in the normal pixel.Be example with 26 cun TFT-LCD still, if the length breadth ratio of its normal display pixel 20/5, then the length breadth ratio of pixel TFT then is 50/5 on the offset data line.Can guarantee that like this offset data voltage can normally be filled among the liquid crystal capacitance and memory capacitance of virtual pixel.Certainly, offset data line dummy1, dummy2 also can be arranged on the left and right sides of TFT panel 4, as shown in Figure 6.
Fig. 7 is the signal graph of offset data line of the present invention.
See also Fig. 7, the invention discloses a kind of driving method of liquid crystal indicator, when the integral polarity of certain data line is positive polarity, the offset data line provides the data of negative polarity, otherwise when if the integral polarity of certain data line is negative polarity, the offset data line provides the data of positive polarity.As shown in Figure 7, the offset data polarity on the offset data line Dummy 6 is all opposite with each line data integral polarity 5.
Fig. 8 is the generation process flow diagram of offset data signal of the present invention.
See also Fig. 8, the offset data producing method among the present invention on the virtual pixel is as follows: the polarity of each line data can be calculated the polarity of judging that then offset data needs by time schedule controller 1, and produces offset data.Concrete flow process is as follows: time schedule controller 1 receives data-signal; Time schedule controller 1 carries out the judgement of integral polarity to data of each row, if the result who judges is that integral polarity is negative, then generates the offset data signal of positive polarity, if the result who judges be integral polarity for just, then generate the offset data signal of negative polarity; Export offset data signal and normal data presented signal then together to data driver 3; Data driver 3 receives these signals after this, carries out digital-to-analog conversion in chip, at last to 4 outputs of TFT panel.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (6)
1. the driving method of a liquid crystal indicator, described liquid crystal indicator comprises the capable n row of m display pixel, the both sides of described liquid crystal indicator comprise row or a multiple row virtual pixel, each pixel is controlled by a thin film transistor (TFT), each row pixel links to each other with a sweep trace, each row display pixel links to each other with a data line, each row virtual pixel links to each other with an offset data line, it is characterized in that, to each row pixel,, generate offset data according to the integral polarity of video data, the integral polarity of the polarity of described offset data and this row video data is opposite, m, n is a positive integer.
2. the driving method of liquid crystal indicator according to claim 1 is characterized in that, the electric capacity of described virtual pixel is greater than the electric capacity of display pixel.
3. the driving method of liquid crystal indicator according to claim 1 is characterized in that, described virtual pixel is row, and the electric capacity of described virtual pixel is 5 times of electric capacity of display pixel.
4. the driving method of liquid crystal indicator according to claim 3 is characterized in that, the raceway groove length breadth ratio of the thin film transistor (TFT) of described virtual pixel is 5 times of raceway groove length breadth ratio of the thin film transistor (TFT) of display pixel.
5. the driving method of liquid crystal indicator according to claim 1 is characterized in that, described virtual pixel is two row, and the electric capacity of each virtual pixel is 2.5 times of electric capacity of display pixel.
6. the driving method of liquid crystal indicator according to claim 5 is characterized in that, the raceway groove length breadth ratio of the thin film transistor (TFT) of each virtual pixel is 2.5 times of raceway groove length breadth ratio of the thin film transistor (TFT) of display pixel.
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| CN2008102040493A CN101419790B (en) | 2008-12-04 | 2008-12-04 | Driving method for liquid crystal display device |
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| CN2008102040493A CN101419790B (en) | 2008-12-04 | 2008-12-04 | Driving method for liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101866604B (en) * | 2010-03-19 | 2012-08-22 | 华映视讯（吴江）有限公司 | Multi-partition pixel drive circuit and method thereof |
| CN102708817B (en) * | 2012-04-10 | 2014-09-10 | 京东方科技集团股份有限公司 | Display device driving method and display device |
| CN105575321A (en) * | 2014-10-15 | 2016-05-11 | 上海和辉光电有限公司 | Pixel circuit of display device and compensation method thereof |
| CN106782383B (en) | 2016-12-29 | 2018-10-19 | 深圳市华星光电技术有限公司 | Liquid crystal display apparatus driving circuit and liquid crystal display device |
| CN109741717A (en) * | 2019-03-26 | 2019-05-10 | 京东方科技集团股份有限公司 | Pixel compensation method, device, sequence controller, array substrate and display device |
| CN111477186B (en) * | 2020-05-07 | 2021-03-16 | Tcl华星光电技术有限公司 | Time schedule controller, display panel and driving method thereof |
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Owner name: NANJING CEC PANDA LCD TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SVA (GROUP) CO., LTD. Effective date: 20110613 |
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Effective date of registration: 20110613 Address after: 210038 Nanjing economic and Technological Development Zone, Jiangsu Province, Hengyi Road, No. 9, No. Patentee after: Nanjing CEC Panda LCD Technology Co., Ltd. Address before: 200233, Shanghai, Yishan Road, No. 757, third floor, Xuhui District Patentee before: SVA (Group) Co., Ltd. |