CN101399020B - Drive method for pre-charging pixel by LCD device - Google Patents
Drive method for pre-charging pixel by LCD device Download PDFInfo
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- CN101399020B CN101399020B CN2007101754843A CN200710175484A CN101399020B CN 101399020 B CN101399020 B CN 101399020B CN 2007101754843 A CN2007101754843 A CN 2007101754843A CN 200710175484 A CN200710175484 A CN 200710175484A CN 101399020 B CN101399020 B CN 101399020B
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Abstract
The invention relates to a drive method that precharging is carried out on pixels by a liquid crystal display device. The grids of two adjacent lines of thin film transistors are opened simultaneously, then, the grids of the thin film transistor in the lower line are firstly closed, and the grids of the thin film transistor in the upper line are closed after the grids of the thin film transistor in the alternate line are opened, thus leading the opening time of thin film transistor in the upper line to be two times that of the proposal of the prior art and causing the charging interval of the thin film transistor to be lengthened; storage capacitance is charged fully, so as to thoroughly eliminate the phenomenon of traverse weak bright lines. The drive method can be operated easily, does not need any increase of cost and effectively improves the image quality.
Description
Technical field
The present invention relates to a kind of control method of LCD, particularly a kind of liquid crystal indicator carries out precharge driving method to pixel.
Background technology
In the control timing of employed traditional time schedule controller (Timing Controller is called for short T/CON) output at present, by opening and shutting off of grid movable signal (Clock Pluse Vertical is called for short CPV) control grid.Concrete control procedure is: gate enable signal (Start Vertical is called for short STV) sends a high level, and the expression grid can be opened; Then, when the grid movable signal was rising edge, the grid of the first row thin film transistor (TFT) (Thin Film Transistor is called for short TFT) was opened, and at this moment data are loaded on the memory capacitance at the first row liquid crystal two ends through the source electrode of TFT, and the first row TFT begins charging; When the next rising edge of grid movable signal arrives, the grid of the first row TFT is closed, and corresponding data load finishes, and the first row TFT finishes charging, the grid of the second row TFT is opened simultaneously, and data are loaded on the memory capacitance at the second row liquid crystal two ends through the source electrode of TFT.Below the action situation of TFT of each row.
Fig. 4 is the control signal sequential chart of prior art gate driver.Because closing of grid needs the regular hour, so there is the time-delay (shown in Fig. 4 dotted line) of signal in grid when closing, can make like this next line TFT error in data be carried on the memory capacitance of lastrow TFT, cause data load mistake and display abnormality phenomenon.In order to prevent the generation of this phenomenon, grid at regulation lastrow TFT on the control timing is just closed when input allows the negative edge of signal OE2, so because input allows the negative edge of signal OE2 before grid movable signal rising edge, thereby the grid that has guaranteed lastrow TFT before next line TFT grid is opened is closed.
Can guarantee the normal load data though close grid in advance, the duration of charging also reduces thereupon, and it is insufficient to cause memory capacitance is charged, and then has caused the generation of horizontal faint bright line phenomenon (Horizontal Dim-Line), makes picture quality descend.
The concrete reason that horizontal faint bright line phenomenon produces is explained as follows.Fig. 5 is prior art inversion mode figure, and as shown in Figure 5: at present the inversion mode that generally adopts is one counter-rotatings of two row, and the reversal that is carried in the data on the memory capacitance every two row once exactly.In this case, when the grid of even number line is opened, data be by the negative sense level to the forward level conversion or by the forward level to the negative sense level conversion, because the influence of load and Source drive driving force can cause the conversion of data that a very big time-delay is arranged on the panel.When the grid of odd-numbered line is opened, data be by the forward level to the forward level conversion or by the negative sense level to the negative sense level conversion, even there is the influence of load on the panel and Source drive driving force, it is delayed time with respect to also being reduced greatly by the time-delay of negative sense level to the forward level conversion.So just make the pixel duration of charging of adjacent two row there are differences, charging effect is inconsistent.Duration of charging is long more, and the voltage that is carried on the memory capacitance will approaching more desirable magnitude of voltage, so picture displayed approaching more desirable gray scale just.When picture is the homogeneous gray scale, just can clearly observe horizontal faint bright line phenomenon.Especially for the module of large-size, load on the panel is bigger, so unavoidably there be the time-delay of long period to the forward level conversion or by the forward level in data during to the negative sense level conversion by the negative sense level, thereby cause horizontal faint bright line phenomenon very serious, picture quality is low.
Summary of the invention
The purpose of this invention is to provide a kind of liquid crystal indicator pixel is carried out precharge driving method, effectively solve prior art the insufficient defective that causes producing horizontal faint bright line of memory capacitance charging.
To achieve these goals, the invention provides a kind of liquid crystal indicator pixel is carried out precharge driving method.May further comprise the steps:
Step 4, constantly at the negative edge of data output control signal, Source drive is exported the data of the capable TFT of N and is loaded on the memory capacitance of capable TFT of M and the capable TFT of N, makes capable TFT of M and the capable TFT of N begin charging simultaneously;
Further, described step 1 is specially:
Step 11, described gate enable signal send high level;
Further, described step 9 is specially:
Step 91, constantly at the negative edge of described grid movable signal, the grid of the capable TFT of described n is opened;
Step 92, constantly at the next rising edge of described grid movable signal, described Source drive is exported the data of the capable TFT of described n and is loaded on the memory capacitance of the capable TFT of this n, makes the capable TFT of described n begin charging;
Step 93, constantly at the next negative edge of described grid movable signal, the grid of the capable TFT of described n is closed, and this n is capable, and the TFT charging is finished.
The invention provides a kind of liquid crystal indicator pixel is carried out precharge driving method, cause producing horizontal faint bright line phenomenon at prior art to memory capacitance charging is insufficient, and have a strong impact on defectives such as picture quality, the grid of adjacent two row TFT is opened simultaneously, at first close the grid of next line TFT, and the grid of the TFT of the grid of lastrow TFT after the delegation of being separated by with it is closed when opening again, its time of opening is exactly the nearly twice in prior art duration of charging so, thereby strengthened in the duration of charging, the memory capacitance charging fully, eliminate horizontal faint bright line phenomenon, optimized picture quality.
The present invention need not do any change on module and printed circuit board (PCB), only need to do less improvement in time schedule controller and Source drive inside according to the inventive method and get final product, and method is simple, need not increase cost.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 carries out the process flow diagram of precharge driving method to pixel for liquid crystal indicator of the present invention;
The process flow diagram that Fig. 2 charges for the present invention first row TFT;
Fig. 3 carries out the sequential chart of precharge driving method to pixel for liquid crystal indicator of the present invention;
Fig. 4 is the control signal sequential chart of prior art gate driver;
Fig. 5 is prior art inversion mode figure.
Embodiment
Fig. 1 carries out the process flow diagram of precharge driving method for liquid crystal indicator of the present invention to pixel, and concrete steps are:
Step 4, at the negative edge of data output control signal TP constantly, Source drive are exported the data of the capable TFT of N and are loaded on the memory capacitance of the capable and capable TFT of N of M, make capable TFT of M and the capable TFT of N begin charging simultaneously;
The present invention is by the grid of adjacent two row TFT is opened simultaneously, at first close the grid of next line TFT, and the grid of the TFT of the grid of lastrow TFT after the delegation of being separated by with it is closed when opening again, make that the time of opening of TFT is the twice of prior art scheme, thereby extended in the duration of charging of TFT greatly, the memory capacitance charging has fully thoroughly been eliminated horizontal faint bright line phenomenon.
The process flow diagram that Fig. 2 charges for the present invention first row TFT.In technique scheme, step 1 is specially:
Step 11, gate enable signal STV send high level;
In step 1, gate enable signal STV sends high level, and expression this moment and later grid movable signal CPV are effective; Along constantly, the grid of TFT just begins to open and close action in the triggering of grid movable signal CPV.So the rising edge of the grid movable signal after grid movable signal STV constantly, the grid of the first row TFT is opened.
In technique scheme, step 9 is specially:
Step 91, constantly at the negative edge of grid movable signal CPV, the grid of the capable TFT of n is opened;
In the negative edge moment of step 92, data output control signal TP, Source drive is exported the data of the capable TFT of n and is loaded on the memory capacitance of the capable TFT of n, makes the capable TFT of n begin charging;
Step 93, constantly at the next negative edge of grid movable signal CPV, the grid of the capable TFT of n is closed, and n is capable, and the TFT charging is finished.
Further, in step 9, when M=n, the duration of charging of the capable TFT of n is opened one-period than the duration of charging of the capable TFT of prior art n more, data in this cycle that has more are invalid, so can not have shownly on panel, and data have loaded the time in two cycles, make the capable pixel charging of n equally fully.
Implement when of the present invention, at the inner buffer memory that increases of time schedule controller, to store two line data.Except first row, one group of per two behavior in back, capable until n-1, the data of every group of odd-numbered line are exported prior to even number line.Capable for n, its data get final product according to traditional transmission method output.In addition, the frequency configuration with adjacent two pulses of data output control signal becomes inequality.Because if take the data output control signal of frequency unanimity according to prior art, with the 2nd the row TFT and the 3rd the row TFT charge condition is example: though realized to the 2nd the row TFT precharge, but the data of the 3rd row TFT are to be the forward level or to be the negative sense level by the forward level conversion by the negative sense level conversion, the data of the 3rd row TFT will occur and original the 2nd row TFT the same situation so, i.e. the 2nd row charging fully and the 3rd row charging is insufficient.And strengthen when the high level lasting time with the data output control signal TP of the even number behind the gate enable signal STV rising edge, even the data of the 3rd row TFT are by being the forward level by the negative sense level conversion or being the negative sense level by the forward level conversion, but the memory capacitance duration of charging has strengthened, and has reached the precharge to the 2nd row TFT simultaneously again.The data output control signal TP here is data are outputed to panel by Source drive a control signal.In the technical program, the high level lasting time of the data output control signal TP of the even number behind the gate enable signal STV rising edge is strengthened, the amplitude of increasing can be odd number data output control signal TP high level about 1/3.
Fig. 3 carries out the sequential chart of precharge driving method to pixel for liquid crystal indicator of the present invention.As shown in Figure 3, in the negative edge moment of first grid movable signal CPV, the grid of the TFT of the TFT of the 2nd row G2 and the 3rd row G3 is opened simultaneously, in the negative edge moment of data output control signal TP, Source drive export the 3rd row G3 TFT data and be loaded into the TFT of the 2nd row G2 and the memory capacitance of TFT of the 3rd row G3 on, make the TFT of the 2nd row G2 and the TFT of the 3rd row G3 begin charging simultaneously; In the rising edge moment of second grid movable signal CPV, the TFT of the 3rd row G3 closes, the TFT of the 3rd row G3 finishes charging, the data of Source drive output at this moment become by the data of the TFT of the 3rd row G3 the 2nd row G2 TFT data and be loaded on the memory capacitance of TFT of the 2nd row G2, make the TFT of the 2nd row G2 continue charging, up to the negative edge moment of second grid movable signal CPV, the TFT of the 2nd row G2 just closes and finishes charging.Following process and the like, up to the capable Gn-1 of n-1.About doubling by the technique scheme of the present invention grid time of opening with the 2nd row TFT of can realizing.In that cycle that the 2nd row TFT opens in advance, it is equidirectional being loaded into the voltage (data of the 3rd row TFT) of the 2nd row TFT grid and the voltage (data of the 2nd row TFT) of actual needs, even these two data differences, also can fill earlier with Partial charge the 2nd row TFT earlier, with regard to having realized the memory capacitance of the 2nd row TFT is carried out precharge like this, accelerated the ascending velocity of data, and then the feasible charging effect unanimity of the memory capacitance of two row TFT up and down, the memory capacitance charging is abundant, thereby has thoroughly eliminated horizontal faint bright line phenomenon.The present invention need not cost, and is simple, remarkable to the optimization effect of picture quality.
It should be noted that at last: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (5)
1. a liquid crystal indicator carries out precharge driving method to pixel, it is characterized in that: may further comprise the steps:
Step 1, gate enable signal send high level, and the first row TFT charges;
Step 2, at the negative edge of grid movable signal constantly makes M=2, N=3;
Step 3, open capable TFT of M and the capable TFT of N simultaneously;
Step 4, constantly at the negative edge of data output control signal, Source drive is exported the data of the capable TFT of N and is loaded on the memory capacitance of capable TFT of M and the capable TFT of N, makes capable TFT of M and the capable TFT of N begin charging simultaneously;
Step 5, at the next rising edge of described grid movable signal is constantly closed the capable TFT of N, and described Source drive is exported the data of the capable TFT of M and is loaded on the memory capacitance of the capable TFT of M, makes the capable TFT of M continue charging;
Step 6, at the next negative edge of described grid movable signal is constantly closed the capable TFT of M;
Step 7, make M=M+2, N=N+2;
Step 8, judging M=n, is execution in step 9 then, otherwise execution in step 3, wherein n is the vertical valid pixel number of panel;
Step 9, n are capable, and TFT charges.
2. liquid crystal indicator according to claim 1 carries out precharge driving method to pixel, it is characterized in that: described step 1 is specially:
Step 11, described gate enable signal send high level;
Step 12, constantly at the rising edge of described grid movable signal, the grid of the described first row TFT is opened;
Step 13, constantly at the negative edge of described data output control signal, described Source drive is exported the data of the described first row TFT and is loaded on the memory capacitance of the described first row TFT, makes this first row TFT begin charging;
Step 14, at the negative edge of described grid movable signal is constantly closed the grid of the described first row TFT, and the described first row TFT charging is finished.
3. liquid crystal indicator according to claim 1 carries out precharge driving method to pixel, it is characterized in that: described step 9 is specially:
Step 91, constantly at the negative edge of described grid movable signal, the grid of the capable TFT of described n is opened;
Step 92, constantly at the negative edge of described data output control signal, described Source drive is exported the data of the capable TFT of described n and is loaded on the memory capacitance of the capable TFT of this n, makes the capable TFT of described n begin charging;
Step 93, constantly at the next negative edge of described grid movable signal, the grid of the capable TFT of described n is closed, and this n is capable, and the TFT charging is finished.
4. liquid crystal display apparatus driving circuit according to claim 1, it is characterized in that: behind the described gate enable signal rising edge, the even number high level lasting time that described data output control signal occurs is longer than the odd number high level lasting time that described data output control signal occurs.
5. liquid crystal display apparatus driving circuit according to claim 1, it is characterized in that: behind the described gate enable signal rising edge, the odd number high level lasting time that described data output control signal occurs is 3/4 of the even number high level lasting time that occurs of described data output control signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101754843A CN101399020B (en) | 2007-09-29 | 2007-09-29 | Drive method for pre-charging pixel by LCD device |
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| CN2007101754843A CN101399020B (en) | 2007-09-29 | 2007-09-29 | Drive method for pre-charging pixel by LCD device |
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| CN101399020A CN101399020A (en) | 2009-04-01 |
| CN101399020B true CN101399020B (en) | 2010-08-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9111502B2 (en) | 2012-11-30 | 2015-08-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Driving circuit and LCD device having data monitoring module |
| CN102956217B (en) * | 2012-11-30 | 2015-04-22 | 深圳市华星光电技术有限公司 | Driving method and driving circuit of liquid crystal panel and liquid crystal display device |
| US10235924B2 (en) | 2015-07-03 | 2019-03-19 | Hisense Electric Co., Ltd. | Liquid crystal display device and method |
| CN104916265B (en) * | 2015-07-03 | 2017-10-20 | 青岛海信电器股份有限公司 | Liquid crystal display processing method, device and equipment |
| CN107068108B (en) * | 2017-06-26 | 2019-06-28 | 惠科股份有限公司 | Display panel driving method and device and display device |
| TWI656735B (en) * | 2017-11-21 | 2019-04-11 | 友達光電股份有限公司 | Multiplexer circuit and its display panel |
| CN109360536B (en) * | 2018-12-12 | 2021-06-01 | 惠科股份有限公司 | Display driving method and display device |
| CN109523971B (en) * | 2018-12-24 | 2021-02-26 | 惠科股份有限公司 | Display panel drive circuit and display device |
| CN110136643B (en) * | 2019-06-12 | 2021-01-08 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display substrate and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005250177A (en) * | 2004-03-04 | 2005-09-15 | Sharp Corp | Liquid crystal display device and method for driving liquid crystal display device |
| CN1924649A (en) * | 2005-08-29 | 2007-03-07 | 三星电子株式会社 | Display device and driving method therefor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005250177A (en) * | 2004-03-04 | 2005-09-15 | Sharp Corp | Liquid crystal display device and method for driving liquid crystal display device |
| CN1924649A (en) * | 2005-08-29 | 2007-03-07 | 三星电子株式会社 | Display device and driving method therefor |
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