CN100594413C - Liquid crystal display panel and driving method thereof - Google Patents
Liquid crystal display panel and driving method thereof Download PDFInfo
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- CN100594413C CN100594413C CN200810203256A CN200810203256A CN100594413C CN 100594413 C CN100594413 C CN 100594413C CN 200810203256 A CN200810203256 A CN 200810203256A CN 200810203256 A CN200810203256 A CN 200810203256A CN 100594413 C CN100594413 C CN 100594413C
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000004973 liquid crystal related substance Substances 0.000 title abstract description 18
- 239000011159 matrix material Substances 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
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Abstract
The invention relates to a liquid crystal display panel and a drive method thereof. The liquid crystal display panel comprises a plurality of pixels in matrix distribution, a plurality of grid scanning lines providing scanning signals for each row of pixels, and a plurality of data wires providing data signals for each list of pixels; the grid scanning lines are connected with a grid driver, the data wires are connected with a data driver, and the grid driver and the data driver are driven by a time schedule controller; wherein, the liquid crystal display panel also comprises a list of virtualpixels and a voltage comparator; the voltage comparator comprises a first input end, a second input end and a feedback output end; the first input end and the second input end are connected with thevirtual pixels, and the feedback output end is connected with the data driver. The liquid crystal display panel and the drive method provided by the invention can avoid flicker and photogene caused byfeedthrough voltage by adjusting the data wire voltage output by each pixel.
Description
Technical field
The present invention relates to a kind of display panels and driving method thereof, particularly relate to a kind of display panels and the driving method thereof that can regulate the image quality flicker automatically.
Background technology
(thin film transistor liquid crystal display is a kind of flat-panel screens that is widely used most at present TFT-LCD) to Thin Film Transistor-LCD, and it has advantages such as low-power, thin type light weight and low voltage drive.Fig. 1 is the structural representation of existing display panels.Each pixel comprises liquid crystal capacitance Clc and storage capacitors Cst, and wherein liquid crystal capacitance Clc makes liquid crystal under the effect of pixel voltage, rotate, thus the transmitance of control light valve; Storage capacitors Cst makes the variation that reduces pixel voltage in a frame time.The gate terminal of each thin film transistor (TFT) (TFT) links to each other with gate line, and source terminal links to each other with data line, and drain electrode end links to each other with pixel electrode.Gate drivers is connected with all Gate electrode, and data driver links to each other with all Data.Gate drivers and data driver come opening and closing of control gate line by Timing controler, and the output of signal.In order to regulate public electrode Com voltage, image quality is under the minimum state of flicker, being in 128 GTGs with picture usually is that benchmark is debugged.As shown in Figure 2, when picture shows 128 GTGs, regulate Com voltage, make the voltage difference of the voltage and the Com of pixel voltage positive polarity, be V128+, equate with the absolute value of the voltage difference of Com with the voltage of pixel voltage negative polarity, i.e. V128-, when V128+=V128-, picture is under the minimum state of flicker.When picture showed different GTG, 0 GTG for example was because liquid crystal capacitance is under different GTGs, the difference of its specific inductive capacity causes the variation of liquid crystal capacitance, and then influence is under different GTGs, the difference of feedthrough (feedthrough) voltage makes V0+ ≠ V0-on the pixel.Will cause the flicker of picture like this, and then the direct-current ion that produces causes the generation of image retention.
Prior art is regulated public electrode voltages because employing 128 GTGs are benchmark, and picture is under the minimum state of flicker (flicker).Like this, when picture is in non-128 GTGs, because the variation of liquid crystal specific inductive capacity, make the difference of feedthrough (feedthrough) voltage on the pixel, cause the difference that in fact obtains voltage on the pixel, therefore cause the voltage difference of pixel electrode when positive-negative polarity, cause the flicker of image quality, even produce image retention (image sticking).
Summary of the invention
Technical matters to be solved by this invention provides a kind of display panels and driving method thereof, by the data line voltage of each pixel output is adjusted flicker or the image retention that can avoid feedthrough feedthrough voltage to cause.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of display panels, comprising:
A plurality of pixels are rectangular distribution;
Many controlling grid scan lines are for each row pixel provides sweep signal;
Many data lines are for each row pixel provides data-signal;
Described controlling grid scan line links to each other with gate drivers, and described data line links to each other with data driver, and described gate drivers and data driver are driven by time schedule controller;
Wherein, described display panels also comprises a row virtual pixel and a voltage comparator, described voltage comparator comprises first input end, second input end and feedback output end, the odd-numbered line of described first input end and described virtual pixel links to each other, the even number line of second input end and described virtual pixel links to each other, and described feedback output end links to each other with described data driver.
Above-mentioned display panels, the first input end of described voltage comparator links to each other with the even number line of described virtual pixel, and the odd-numbered line of second input end and described virtual pixel links to each other.
The present invention comprises the steps: for solving the problems of the technologies described above the driving method that a kind of display panels also is provided
A) to each GTG, calculate in advance under this GTG, the pixel voltage during positive-negative polarity is to the difference of public electrode voltages; Voltage differences when described each GTG is in positive-negative polarity is measured by voltage comparator and is fed back to data driver, its the value for (| Vc1-Vcom|-|Vcom-Vc2|)/2, wherein, Vc1, the pixel voltage of measuring by voltage comparator when Vc2 is respectively positive-negative polarity under the current GTG, Vcom is a public electrode voltages;
When b) normally showing, each pixel is carried out the data voltage adjustment according to its current output GTG, the pixel voltage when making positive-negative polarity all equates the difference of public electrode voltages; Described data voltage adjustment comprises: during positive polarity data voltage is adjusted into (Vdata+)+(| Vc1-Vcom|-|Vcom-Vc2|)/2 back output; During negative polarity data voltage is adjusted into (Vdata-)+(| Vc1-Vcom|-|Vcom-Vc2|)/2 back output, wherein, Vdata+, Vdata-are respectively the pairing pixel voltage of positive-negative polarity under the current GTG.
The present invention contrasts prior art following beneficial effect: display panels provided by the invention and driving method thereof, difference when measuring down the pixel voltage positive-negative polarity by voltage comparator, just make pixel electrode when the positive-negative polarity by the voltage of adjusting data line, be in the position of balance, make pixel electrode under any GTG all with public electrode voltages Vcom symmetry, thereby avoided the generation of flicker and image retention.
Description of drawings
Fig. 1 is the structural representation of available liquid crystal display panel.
Pixel voltage synoptic diagram when Fig. 2 is available liquid crystal display panel difference GTG.
Fig. 3 is the structural representation of display panels of the present invention.
Fig. 4 is the structural representation of comparer of the present invention.
Pixel voltage synoptic diagram when Fig. 5 is the different GTG of display panels of the present invention.
Among the figure:
1 time schedule controller, 2 data drivers
3 gate drivers, 4 voltage comparators
Embodiment
The invention will be further described below in conjunction with accompanying drawing and exemplary embodiments.
Fig. 3 is the structural representation of display panels of the present invention.
See also Fig. 3, display panels of the present invention comprises a plurality of pixels, is the capable n column distribution of m; Many controlling grid scan line G1, G2...Gm is for each row pixel provides sweep signal; Many data line D1, D2...Dn is for each row pixel provides data-signal; Described controlling grid scan line links to each other with gate drivers 3, and described data line links to each other with data driver 2, and described gate drivers 3 and data driver 2 are driven by time schedule controller 1.Each pixel comprises liquid crystal capacitance Clc and storage capacitors Cst, and wherein liquid crystal capacitance Clc makes liquid crystal under the effect of pixel voltage, rotate, thus the transmitance of control light valve; Storage capacitors Cst keeps pixel voltage in a frame time constant.The gate terminal of each thin film transistor (TFT) (TFT) links to each other with gate line, and source terminal links to each other with data line, and drain electrode end links to each other with pixel electrode.The rightmost side of display panels is provided with a row virtual pixel and a voltage comparator 4 in the embodiment of the invention.
The voltage comparator 4 that the present invention uses comprises first input end, second input end and feedback output end, see also Fig. 4, voltage comparator 4 is one to have the electronic component of data-handling capacity, and it has three ports, comprises first input end C1, second input end C2 and the feedback output end, described first input end, second input end links to each other with virtual pixel, and described feedback output end links to each other with data driver 2.Specifically, the grid of virtual pixel is controlled the switch of pixel by gate drivers 3; The source electrode of virtual pixel links to each other with data driver 2 by the Ddummy line, the drain electrode of the virtual pixel (not shown) that is connected with pixel electrode.The pixel electrode of each virtual pixel according to positive-negative polarity respectively with first input end C1, the second input end C2 links to each other.For example for row inversion driving pattern: odd-numbered line G1, G3, G5 ... the virtual pixel at place links to each other with the first input end C1 of voltage comparator 4; Even number line G2, G4, G6 ... the virtual pixel at place links to each other with the second input end C2 of voltage comparator 4.Certainly the parity rows connection exchanges and also can reach same effect, that is to say odd-numbered line G1, G3, G5 ... the virtual pixel at place can link to each other with the second input end C2 of voltage comparator 4; Even number line G2, G4, G6 ... the virtual pixel at place links to each other with the first input end C1 of voltage comparator 4.
It is benchmark that prior art adopts 128 GTGs, manual adjustments public electrode voltages Vcom, and under 128 GTGs, the minimum magnitude of voltage of flicker is made as public electrode voltages Vcom by eye-observation, and picture is under the minimum state of flicker (flicker).When picture is in non-128 GTGs, because the variation of liquid crystal specific inductive capacity, make and the difference of feedthrough (feedthrough) voltage on the pixel cause the difference that in fact obtains voltage on the pixel, therefore cause the voltage difference of pixel electrode when positive-negative polarity, cause the flicker of image quality.Be under the minimum state of flicker in order to adjust picture, the driving method of display panels provided by the invention comprises: to each GTG, calculate in advance under this GTG, the pixel voltage during positive-negative polarity is to the difference of public electrode voltages; During normal the demonstration, each pixel is carried out the data voltage adjustment according to its current output GTG, the pixel voltage when making positive-negative polarity all equates the difference of public electrode voltages.
Next in conjunction with display panels provided by the invention, specifically describe the implementation procedure of driving method of the present invention:
A) to each GTG, open the controlling grid scan line G1 of each row successively, G2...Gm scans this panel;
B) first input end of voltage comparator 4 receives the magnitude of voltage of positive polarity, the average voltage VC1 when calculating pixel electrode being in positive polarity under this GTG;
C) second input end of voltage comparator 4 receives the magnitude of voltage of negative polarity, the average voltage VC2 when calculating pixel electrode being in negative polarity under this GTG;
D) calculate under this GTG, the pixel voltage during positive-negative polarity to the difference of public electrode voltages (| Vc1-Vcom|-|Vcom-Vc2|), the feedback output end by voltage comparator 4 feeds back to data driver 2 with this magnitude of voltage then;
E) to each GTG, circulation step a)～d), the voltage differences when data driver 2 is noted the positive-negative polarity of each GTG correspondence (| Vc1-Vcom|-|Vcom-Vc2|);
When f) normally showing, to a certain GTG, during positive polarity data voltage is adjusted into (Vdata-)+(| Vc1-Vcom|-|Vcom-Vc2|)/2 back output; During negative polarity data voltage is adjusted into (Vdata-)+(| Vc1-Vcom|-|Vcom-Vc2|)/2 back output.
Pixel voltage synoptic diagram when Fig. 5 is the different GTG of display panels of the present invention.
See also Fig. 5, carry out the data voltage adjustment during to GTG 128 output, make V128+=V128-; In like manner, also carry out the data voltage adjustment during to GTG 0 output, make V0+=V0-.Because the present invention adjusts the data line voltage of each pixel output, under different GTGs, no matter pixel electrode is in positive polarity or negative polarity, and its difference with public electrode voltages Vcom all equates.
In sum, pixel voltage was to the difference of common electric voltage Vcom when the present invention measured positive-negative polarity under each GTG by voltage comparator 4 in advance, and feed back to data driver 2, during normal the demonstration, data driver 2 is adjusted the data line voltage of each pixel output, therefore flicker or the image retention that can avoid feedthrough feedthrough voltage to cause.
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 (3)
1, a kind of display panels comprises:
A plurality of pixels are rectangular distribution;
Many controlling grid scan lines are for each row pixel provides sweep signal;
Many data lines are for each row pixel provides data-signal;
Described controlling grid scan line links to each other with gate drivers, and described data line links to each other with data driver, and described gate drivers and data driver are driven by time schedule controller;
It is characterized in that, described display panels also comprises a row virtual pixel and a voltage comparator, described voltage comparator comprises first input end, second input end and feedback output end, the odd-numbered line of described first input end and described virtual pixel links to each other, the even number line of second input end and described virtual pixel links to each other, and described feedback output end links to each other with described data driver.
2, a kind of display panels comprises:
A plurality of pixels are rectangular distribution;
Many controlling grid scan lines are for each row pixel provides sweep signal;
Many data lines are for each row pixel provides data-signal;
Described controlling grid scan line links to each other with gate drivers, and described data line links to each other with data driver, and described gate drivers and data driver are driven by time schedule controller;
It is characterized in that, described display panels also comprises a row virtual pixel and a voltage comparator, described voltage comparator comprises first input end, second input end and feedback output end, the even number line of described first input end and described virtual pixel links to each other, the odd-numbered line of second input end and described virtual pixel links to each other, and described feedback output end links to each other with described data driver.
3, a kind of driving method of display panels is characterized in that, described method comprises the steps:
A) to each GTG, calculate in advance under this GTG, the pixel voltage during positive-negative polarity is to the difference of public electrode voltages; Voltage differences when described each GTG is in positive-negative polarity is measured by voltage comparator and is fed back to data driver, its the value for (| Vc1-Vcom|-|Vcom-Vc2|)/2, wherein, Vc1, the pixel voltage of measuring by voltage comparator when Vc2 is respectively positive-negative polarity under the current GTG, Vcom is a public electrode voltages;
When b) normally showing, each pixel is carried out the data voltage adjustment according to its current output GTG, the pixel voltage when making positive-negative polarity all equates the difference of public electrode voltages; Described data voltage adjustment comprises: during positive polarity data voltage is adjusted into (Vdata+)+(| Vc1-Vcom|-|Vcom-Vc2|)/2 back output; During negative polarity data voltage is adjusted into (Vdata-)+(| Vc1-Vcom|-|Vcom-Vc2|)/2 back output, wherein, Vdata+, Vdata-are respectively the pairing pixel voltage of positive-negative polarity under the current GTG.
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| CN200810203256A CN100594413C (en) | 2008-11-24 | 2008-11-24 | Liquid crystal display panel and driving method thereof |
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| CN200810203256A CN100594413C (en) | 2008-11-24 | 2008-11-24 | Liquid crystal display panel and driving method thereof |
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| CN100594413C true CN100594413C (en) | 2010-03-17 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101587700B (en) * | 2009-06-26 | 2011-11-09 | 友达光电股份有限公司 | Liquid crystal display and method for driving same |
| CN101739978B (en) * | 2009-11-27 | 2013-04-17 | 深圳创维－Rgb电子有限公司 | Device for automatically calibrating liquid crystal VCOM voltage value and method thereof |
| CN102157138B (en) * | 2011-04-14 | 2013-01-02 | 深圳市华星光电技术有限公司 | Liquid crystal display and driving method thereof |
| US9412322B2 (en) | 2011-04-14 | 2016-08-09 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Liquid crystal display device and method for driving same |
| CN102402958B (en) * | 2011-11-16 | 2014-03-26 | 深圳市华星光电技术有限公司 | Method for driving liquid crystal panel |
| TWI473066B (en) * | 2012-04-23 | 2015-02-11 | Sitronix Technology Corp | Display panel and its drive circuit |
| CN103258514B (en) * | 2013-05-06 | 2015-05-20 | 深圳市华星光电技术有限公司 | GOA drive circuit and drive method |
| TWI485692B (en) | 2013-06-17 | 2015-05-21 | Novatek Microelectronics Corp | Source driver apparatus and method for driving display panel |
| CN104090399A (en) * | 2014-07-23 | 2014-10-08 | 无锡博一光电科技有限公司 | Liquid crystal display screen flicker automatic burning method |
| CN106157870B (en) | 2014-11-18 | 2019-04-02 | 深圳市华星光电技术有限公司 | Method of adjustment, device and the liquid crystal display systems of display parameters |
| CN106483729B (en) * | 2017-01-04 | 2019-06-07 | 京东方科技集团股份有限公司 | Display base plate and display equipment |
| CN108665861B (en) * | 2017-03-31 | 2021-01-26 | 京东方科技集团股份有限公司 | Display driving device, display driving method and display device |
| CN107966838B (en) * | 2017-12-18 | 2020-09-18 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and display device |
| CN108510954B (en) * | 2018-04-19 | 2022-01-11 | 京东方科技集团股份有限公司 | Control circuit, display substrate, display device and display method |
| CN111145701B (en) * | 2020-01-02 | 2022-04-26 | 京东方科技集团股份有限公司 | Voltage adjusting method and device of display panel and display panel |
| CN111415610B (en) * | 2020-04-26 | 2021-07-23 | Tcl华星光电技术有限公司 | Voltage regulation method of virtual pixel, display panel and storage medium |
| CN113129849B (en) * | 2021-04-09 | 2022-11-01 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and pixel driving method |
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