CN101414089A - Method for driving liquid crystal display apparatus - Google Patents
Method for driving liquid crystal display apparatus Download PDFInfo
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- CN101414089A CN101414089A CNA2008102032478A CN200810203247A CN101414089A CN 101414089 A CN101414089 A CN 101414089A CN A2008102032478 A CNA2008102032478 A CN A2008102032478A CN 200810203247 A CN200810203247 A CN 200810203247A CN 101414089 A CN101414089 A CN 101414089A
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Abstract
The invention relates to a driving method for a liquid crystal display device. The liquid crystal display device comprises m lines and n rows of pixels. Every line of pixels is connected with a scanning beam; a grid actuator provides a scanning signal for the scanning beam; wherein, double scanning and charging are carried out on every line of pixels in a frame; a precharging voltage is charge for the first time; data voltage is charged for the second time; the precharging voltage and the data voltage have the polarity. The driving method for the liquid crystal display device provided by the invention can ensure the pixels to be charged completely by precharging the pixels and improves 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 pixel undercharge.
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).
Because liquid crystal indicator has in light weight, thin thickness, characteristics such as low in energy consumption, has been widely used in the increasing electronic product.But, along with liquid crystal indicator use extensively, the size of liquid crystal indicator is increasing, resolution is more and more higher, and in order to solve the dynamic fuzzy problem of liquid crystal indicator, sweep frequency has increased by one times by original 60Hz, brings up to 120Hz.Owing to above reason, the time that TFT opens on each horizontal scanning line of liquid crystal indicator is shorter and shorter, therefore can cause the undercharge of pixel, influences display quality.
As shown in Figure 1, in the time, sweep signal is a high level at T1, and the TFT that be connected on the sweep trace this moment opens, and pixel is charged, and makes pixel voltage equal data voltage.Charging process needs the regular hour, just can make current potential on the pixel reach the some position of data voltage, to guarantee to show correct GTG.In Fig. 1, the time long enough of T1 makes pixel voltage can reach the level of data voltage, shows that charging is sufficient on the pixel.But, owing to mention that the high level time of sweep signal shortens in the preceding paragraph, promptly shorten in order to the time of opening TFT, as shown in Figure 2, T2 shortens time T2＜T1 afterwards for the sweep signal high level.In the time of T2, can not finish the action of charging, cause pixel voltage to be lower than data voltage, be indicated as undercharge, difference appears in this GTG that can cause showing, reduces display quality.
Summary of the invention
Technical matters to be solved by this invention provides a kind of driving method of liquid crystal indicator, can improve the pixel undercharge.
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 pixel, each row pixel links to each other with a sweep trace, described sweep trace provides sweep signal by gate drivers, wherein, in a frame, each row pixel is carried out twice scanning charging, charge into pre-charge voltage for the first time; For the second time charge into data voltage, the polarity of described pre-charge voltage and data voltage is identical, and m and n are positive integer.
In the driving method of above-mentioned liquid crystal indicator, described gate drivers is exported sweep signal twice to each row pixel in a frame.
In the driving method of above-mentioned liquid crystal indicator, described sweep signal is provided respectively by two gate drivers.
In the driving method of above-mentioned liquid crystal indicator, during the point inversion driving, the pre-charge voltage that k is capable is the data voltage of k-2 row, and the pre-charge voltage of first row and second row is a virtual data, and k is a positive integer.
In the driving method of above-mentioned liquid crystal indicator, during the 2line inversion driving, the pre-charge voltage that k is capable is the data voltage of k-4 row, and first row is a virtual data to the pre-charge voltage of fourth line, and k is a positive integer.
In the driving method of above-mentioned liquid crystal indicator, described virtual data is inserted in before the first line data voltage, and its polarity is identical with the data polarity that needs the precharge row.
The present invention contrasts prior art following beneficial effect: the driving method of liquid crystal indicator provided by the invention by pixel is carried out precharge, guarantees that it can charge fully, has improved display quality.The driving method of liquid crystal indicator provided by the invention goes for multiple type of drive.
Description of drawings
Fig. 1 is the pixel synoptic diagram that charges fully.
Fig. 2 is a pixel undercharge synoptic diagram.
Fig. 3 is a drive principle synoptic diagram of the present invention.
Fig. 4 is an available liquid crystal mounted point inversion driving synoptic diagram.
Fig. 5 is an available liquid crystal device 2Line inversion driving synoptic diagram.
Fig. 6 is that the present invention puts the inversion driving synoptic diagram.
Fig. 7 is a 2Line inversion driving synoptic diagram of the present invention.
Fig. 8 is the panel construction synoptic diagram of the embodiment of the invention one.
Fig. 9 is the drive waveforms synoptic diagram of Fig. 8.
Figure 10 is the panel construction synoptic diagram of the embodiment of the invention two.
Figure 11 is the drive waveforms synoptic diagram of Figure 10.
Among the figure:
1 time schedule controller, 2 gate drivers, 3 data drivers
4 first grid drivers, 5 second grid drivers
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 pixel, see also Fig. 8, each pixel is by a thin film transistor (TFT) (TFT), each row pixel links to each other with a sweep trace, sweep trace G1, G2 ... Gm provides sweep signal by gate drivers 2, each row pixel links to each other with a data line, data line D1, 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 invention discloses a kind of driving method of liquid crystal indicator, see also Fig. 3, every sweep trace twice TFT occur and opens the high level that needs in a frame, when opening for the first time, pixel is charged into and the identical voltage of data voltage polarity that shows usefulness, this voltage generally is the data voltage that pixel need charge in the delegation of front, and this process is called precharge; When opening for the second time, pixel is charged into the data voltage that shows usefulness, promptly in the frame pixel is carried out twice charging, and the polarity of twice charging is identical.Because the polarity of twice charging is identical, through reducing the required voltage that charges into for the second time after the precharge for the first time, the assurance pixel can be charged fully.
Fig. 4 is an available liquid crystal mounted point inversion driving synoptic diagram, and Fig. 5 is an available liquid crystal device 2Line inversion driving synoptic diagram.
See also Fig. 4 and Fig. 5, point is during inversion driving, and is identical every the polarity of the data voltages of 2 row, so the data voltage of k-2 row can be used as the capable pre-charge voltage of k, i.e. and k=2; During the 2line inversion driving, identical every the polarity of 4 data voltages of going, so the data voltage of k-4 row can be used as the capable pre-charge voltage of k, i.e. k=4.Because several row in front do not have data that it is carried out precharge, then need to increase virtual (dummy) data of corresponding line, the polarity of dummy data must be identical with the data polarity that needs the precharge row.
Fig. 6 is that the present invention puts the inversion driving synoptic diagram.
See also Fig. 6, when the present invention puts inversion driving, before first row, the first column data D1, need to insert the virtual data of 2 row, be respectively dummy data1 and dummy data2, wherein, the polarity of dummy data1 is identical with the polarity of first row, the first column data D1, and the polarity of dummy data2 is identical with the polarity of the first row secondary series data D2.When the present invention puts inversion driving, in a frame, each row pixel is carried out twice scanning charging, charge into pre-charge voltage for the first time; Charge into for the second time data voltage, the pre-charge voltage that k is capable is the data voltage of k-2 row, and the pre-charge voltage of first row and second row is a virtual data, and k is a positive integer.
Fig. 7 is a 2Line inversion driving synoptic diagram of the present invention.
See also Fig. 7, during 2Line inversion driving of the present invention, before the first line data D1, need to insert the virtual data of 4 row, be respectively dummy data1, dummy data2, dummy data3, dummy data4, the polarity of dummy data1 is identical with the polarity of the first line data D1, the polarity of dummy data2 is identical with the polarity of the first line data D2, and the polarity of dummy data3 is identical with the polarity of the first line data D3, and the polarity of dummy data4 is identical with the polarity of the first line data D4.During 2Line inversion driving of the present invention, in a frame, each row pixel is carried out twice scanning charging, charge into pre-charge voltage for the first time; Charge into for the second time data voltage, the pre-charge voltage that k is capable is the data voltage of k-4 row, and first row is a virtual data to the pre-charge voltage of fourth line, and k is a positive integer.
Fig. 8 is the panel construction synoptic diagram of the embodiment of the invention one.
See also Fig. 8, the panel construction of present embodiment comprises the capable n row of m pixel, each pixel is by a thin film transistor (TFT) (figure does not show), each row pixel links to each other with a sweep trace, sweep trace G1, G2 ... Gm provides sweep signal by gate drivers 2, each row pixel links to each other with a data line, data line D1, 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.Time schedule controller 1 provides video data, dummy data, and control signal STV1, STV2 and other control signals (figure does not show) also are provided, and STV1, STV2 are connected to gate drivers 2; Data driver 3 receives video datas, dummy data and goes forward side by side and export the TFT panel to after the conversion of line number mould; Gate drivers 2 is in a side of panel, and output TFT opens required sweep signal.
Figure 10 is the panel construction synoptic diagram of the embodiment of the invention two.
See also Figure 10, the difference of embodiment two and embodiment one is that the liquid crystal panel in the present embodiment uses two gate drivers: first grid driver 4 and second grid driver 5.First grid driver 4, second grid driver 5 and data driver 3 were driven by time schedule controller 1 respectively in the both sides of panel in 5 minutes for first grid driver 4 and second grid driver.Wherein, first grid driver 4 output scanning signals are in order to precharge, and second grid driver 5 output scanning signals are used to write video data.First grid driver 4 is different with the zero hour of second grid driver 5 outputs, by the beginning output time of control signal STV1 control first grid driver 4, by the beginning output time of control signal STV2 control second grid driver 5.The relation of STV1, STV2 and sweep signal output is as shown in figure 11: after control signal STV1 becomes high level by low level, the corresponding first grid driver of back to back first rising edge of clock signal clk 4 output scanning signals are to the first horizontal scanning line G1, the TFT that be connected with sweep trace G1 this moment opens, and pixel begins precharge; After control signal STV2 becomes high level by low level, the corresponding second grid driver of back to back first rising edge of clock signal clk 5 output scanning signals are to the first horizontal scanning line G1, the TFT that be connected with sweep trace G1 this moment opens once more, and pixel charges into data presented voltage; Twice outgoing event obtains the output waveform of G1.
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, a kind of driving method of liquid crystal indicator, described liquid crystal indicator comprises the capable n row of m pixel, each row pixel links to each other with a sweep trace, described sweep trace provides sweep signal by gate drivers, it is characterized in that, in a frame, each row pixel is carried out twice scanning charging, charge into pre-charge voltage for the first time; For the second time charge into data voltage, the polarity of described pre-charge voltage and data voltage is identical, and m and n are positive integer.
2, the driving method of liquid crystal indicator according to claim 1 is characterized in that, described gate drivers is exported sweep signal twice to each row pixel in a frame.
3, the driving method of liquid crystal indicator according to claim 1 is characterized in that, described sweep signal is provided respectively by two gate drivers.
4, the driving method of liquid crystal indicator according to claim 1 is characterized in that, during the point inversion driving, the pre-charge voltage that k is capable is the data voltage of k-2 row, and the pre-charge voltage of first row and second row is a virtual data, and k is a positive integer.
5, the driving method of liquid crystal indicator according to claim 1 is characterized in that, during the 2lne inversion driving, the pre-charge voltage that k is capable is the data voltage of k-4 row, and first row is a virtual data to the pre-charge voltage of fourth line, and k is a positive integer.
According to the driving method of claim 4 or 5 described liquid crystal indicators, it is characterized in that 6, described virtual data is inserted in before the first line data voltage, its polarity is identical with the data polarity that needs the precharge row.
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| CNA2008102032478A CN101414089A (en) | 2008-11-24 | 2008-11-24 | Method for driving liquid crystal display apparatus |
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| CN102254533A (en) * | 2011-08-03 | 2011-11-23 | 深圳市华星光电技术有限公司 | Liquid crystal display device and drive method thereof |
| CN102568422A (en) * | 2010-12-31 | 2012-07-11 | 乐金显示有限公司 | Liquid crystal display device and method for driving the same |
| CN103578436A (en) * | 2012-07-27 | 2014-02-12 | 群康科技(深圳)有限公司 | Liquid crystal screen, three-dimensional image imaging device and operation method of three-dimensional image imaging device and liquid crystal screen |
| US9177515B2 (en) | 2012-07-27 | 2015-11-03 | Innolux Corporation | Liquid crystal display and 3D imaging apparatus and operating methods thereof |
| CN105261342A (en) * | 2015-11-17 | 2016-01-20 | 深圳市华星光电技术有限公司 | Driving method and driving circuit of TFT substrate and display device thereof |
| CN107507585A (en) * | 2017-08-25 | 2017-12-22 | 惠科股份有限公司 | Display panel and its pixel cell precharge switching method |
| CN108053800A (en) * | 2018-01-25 | 2018-05-18 | 北京集创北方科技股份有限公司 | Display device and its driving method |
| CN108877725A (en) * | 2018-08-31 | 2018-11-23 | 重庆惠科金渝光电科技有限公司 | A kind of driving method and device of display panel |
| CN109192176A (en) * | 2018-11-05 | 2019-01-11 | 重庆先进光电显示技术研究院 | Display driving method and driving device, display device |
| CN109410862A (en) * | 2018-11-26 | 2019-03-01 | 惠科股份有限公司 | Charging method, display panel and the storage medium of liquid crystal pixel |
| CN109448651A (en) * | 2018-12-19 | 2019-03-08 | 惠科股份有限公司 | The driving method and display device of display panel |
| CN109523967A (en) * | 2018-12-19 | 2019-03-26 | 惠科股份有限公司 | The driving method and display device of display device |
| CN109523966A (en) * | 2018-12-19 | 2019-03-26 | 惠科股份有限公司 | The driving method and display device of display panel |
| CN109584822A (en) * | 2018-12-19 | 2019-04-05 | 惠科股份有限公司 | The driving method and display device of display panel |
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| CN110517647A (en) * | 2019-08-30 | 2019-11-29 | 上海中航光电子有限公司 | The driving method and liquid crystal display device of liquid crystal display panel |
| CN111028804A (en) * | 2019-12-19 | 2020-04-17 | 福建华佳彩有限公司 | Demux driving method |
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| US10770019B2 (en) | 2018-08-31 | 2020-09-08 | Chongqing Hkc Optoelectronics Co., Ltd. | Method and device for driving display panel with two pulse signals for precharging pixel drive cells |
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| CN102568422B (en) * | 2010-12-31 | 2015-07-01 | 乐金显示有限公司 | Liquid crystal display device and method for driving the same |
| CN102568422A (en) * | 2010-12-31 | 2012-07-11 | 乐金显示有限公司 | Liquid crystal display device and method for driving the same |
| US9070331B2 (en) | 2010-12-31 | 2015-06-30 | Lg Display Co., Ltd. | Liquid crystal display device and method for driving the same |
| WO2013016890A1 (en) * | 2011-08-03 | 2013-02-07 | 深圳市华星光电技术有限公司 | Liquid crystal display device and driving method thereof |
| CN102254533A (en) * | 2011-08-03 | 2011-11-23 | 深圳市华星光电技术有限公司 | Liquid crystal display device and drive method thereof |
| US9177515B2 (en) | 2012-07-27 | 2015-11-03 | Innolux Corporation | Liquid crystal display and 3D imaging apparatus and operating methods thereof |
| CN103578436A (en) * | 2012-07-27 | 2014-02-12 | 群康科技(深圳)有限公司 | Liquid crystal screen, three-dimensional image imaging device and operation method of three-dimensional image imaging device and liquid crystal screen |
| CN105261342A (en) * | 2015-11-17 | 2016-01-20 | 深圳市华星光电技术有限公司 | Driving method and driving circuit of TFT substrate and display device thereof |
| CN107507585A (en) * | 2017-08-25 | 2017-12-22 | 惠科股份有限公司 | Display panel and its pixel cell precharge switching method |
| CN108053800A (en) * | 2018-01-25 | 2018-05-18 | 北京集创北方科技股份有限公司 | Display device and its driving method |
| CN108053800B (en) * | 2018-01-25 | 2021-10-29 | 北京集创北方科技股份有限公司 | Display device and driving method thereof |
| WO2020042310A1 (en) * | 2018-08-31 | 2020-03-05 | 重庆惠科金渝光电科技有限公司 | Method and device for driving display panel |
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| CN109658869A (en) * | 2019-01-30 | 2019-04-19 | 惠科股份有限公司 | A kind of display panel, driving method and display device |
| CN110517647A (en) * | 2019-08-30 | 2019-11-29 | 上海中航光电子有限公司 | The driving method and liquid crystal display device of liquid crystal display panel |
| CN111028804A (en) * | 2019-12-19 | 2020-04-17 | 福建华佳彩有限公司 | Demux driving method |
| CN114842813A (en) * | 2022-05-31 | 2022-08-02 | 惠科股份有限公司 | Data driving circuit, display module and display device |
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Open date: 20090422 |