CN102654985A - Drive method of liquid crystal display device - Google Patents
Drive method of liquid crystal display device Download PDFInfo
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- CN102654985A CN102654985A CN201110370171XA CN201110370171A CN102654985A CN 102654985 A CN102654985 A CN 102654985A CN 201110370171X A CN201110370171X A CN 201110370171XA CN 201110370171 A CN201110370171 A CN 201110370171A CN 102654985 A CN102654985 A CN 102654985A
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Abstract
The invention discloses a drive method of a liquid crystal display device and relates to the field of liquid crystal display, and the drive method is used for improving the time utilization rate. The method comprises the following steps of: after a first row of pixel units loads a grid start voltage and before the first row of pixel units loads a pixel voltage, loading the grid start voltage of a second row of pixel units at the same column, enabling the first row of pixel units and the second row of pixel units to perform self discharge; after self discharge, loading the pixel voltage of the first row of pixel units, and turning off a TFT (Thin Film Transistor) of the first row after charging. The scheme of the invention is suitable for manufacturing of liquid crystal display devices.
Description
Technical field
The present invention relates to field of liquid crystal display, relate in particular to a kind of driving method of liquid crystal indicator.
Background technology
TFT-LCD (Thin Film Transistor-Liquid Crystal Display; Thin film transistor liquid crystal display screen) TFT (Thin Film Transistor; Thin film transistor (TFT)) array base palte comprises: many gate lines, many data lines and a plurality of pixel cell; Wherein, comprise TFT and pixel electrode in each pixel cell.Common type of drive is the voltage that gate drivers provides the opening and closing of TFT grid, and source electrode driver provides the voltage (abbreviating pixel voltage as) of pixel electrode.As shown in Figure 1, LCDs is the drive TFT array line by line, exports the voltage of respective drive row through source electrode driver, thereby reaches the purpose of demonstration; Wherein, CLK is a clock signal, G
1, G
2..., G
NBe respectively the driving voltage of the capable grid of N, Data is the voltage of pixel electrode.
But state in realization in the process of driving,, realize correct driving, have one period moment of closing simultaneously at the grid of two adjacent lines in order to reduce the interference between the adjacent lines grid.This driving method has reduced time availability.
Summary of the invention
Embodiments of the invention provide a kind of driving method of liquid crystal indicator, in order to realize improving time availability.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of driving method of liquid crystal indicator; Comprise: after the lastrow pixel cell loads the grid cut-in voltage and before loading pixel voltage; Load the grid cut-in voltage of current line pixel cell, make the said lastrow of same row and said current line pixel cell carry out self discharge; After self discharge is accomplished, load the pixel voltage of said lastrow pixel cell, close the thin film transistor (TFT) TFT of said lastrow pixel cell after charging is accomplished; Afterwards, load the grid cut-in voltage of next line pixel cell, make the said current line of same row and said next line pixel cell carry out self discharge; After self discharge is accomplished, load the pixel voltage of said current line pixel cell, close the TFT of said current line pixel cell after charging is accomplished.
The embodiment of the invention provides a kind of driving method of liquid crystal indicator; Before the lastrow pixel cell loads pixel voltage; Through loading the grid cut-in voltage of current line pixel cell; Make the lastrow and the self discharge of current line pixel cell of same row, after waiting for the loading of lastrow pixel cell pixel voltage and accomplishing charging, close the TFT of lastrow pixel cell; Load the grid cut-in voltage of next line pixel cell, current line and the next line pixel cell of same row carried out self discharge, load the pixel voltage of current line pixel cell, accomplish the TFT that closes the current line pixel cell after charging.Thereby make that in the driving process of short duration self discharge process is arranged, so just reduced the duration of charging, and the grid of two adjacent lines do not had the shut-in time simultaneously, improved the utilization factor of time.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the signal schematic representation of LCDs driving method in the prior art;
The process flow diagram of the driving method of a kind of liquid crystal indicator that Fig. 2 provides for the embodiment of the invention;
The process flow diagram of the driving method of another liquid crystal indicator that Fig. 3 embodiment of the invention provides;
Fig. 4 is an inversion driving display mode synoptic diagram;
The signal schematic representation of the driving method of a kind of liquid crystal indicator that Fig. 5 provides for the embodiment of the invention;
Fig. 6 is one of partial schematic diagram in the driving method of liquid crystal indicator shown in Figure 5;
Fig. 7 be in the driving method of liquid crystal indicator shown in Figure 5 partial schematic diagram two;
Fig. 8 is a face inversion driving display mode synoptic diagram.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of driving method of liquid crystal indicator, with tft array substrate two the row pixel cells be that example describes, as shown in Figure 2, comprising:
201, after the first row pixel cell loads the grid cut-in voltage and before loading pixel voltage, load the grid cut-in voltage of the second row pixel cell of same row, make win capable pixel cell and the second row pixel cell carry out self discharge.
Wherein, the grid that is spaced apart between the grid cut-in voltage time of the grid cut-in voltage time of the first row pixel cell and second pixel cell is opened 1/2nd of duration.
It is 1/2nd of the first row pixel cell pixel voltage and the second row pixel cell pixel voltage sum that the first row pixel cell and the second row pixel cell carry out the balance of voltage; That is to say; The grid of the first row pixel cell and second pixel cell is opened simultaneously; Make the win capable pixel cell and the second row pixel cell realization balance of voltage, promptly the pixel voltage of the pixel voltage of the first row pixel cell and the second row pixel cell all becomes 1/2nd of the first row pixel cell pixel voltage and the second row pixel cell pixel voltage sum.
202, after self discharge is accomplished, load the said first row pixel cell pixel voltage, and after charging is accomplished, close the thin film transistor (TFT) TFT of first row.
Wherein, When loading the first row pixel cell pixel voltage, the first row pixel cell and the second row pixel cell are charged simultaneously, that is to say; After the first row pixel cell and the second capable pixel cell finish self discharge; When on data, loading the first row pixel cell pixel voltage, owing to the grid of the second row pixel cell is also being opened, so simultaneously to the first row pixel cell and the second row pixel cell charging.
Need to prove that the row of first in embodiment of the invention pixel cell is the arbitrary capable pixel cell in the tft array substrate, the second row pixel cell is the next line pixel cell.
Pixel cell with the triplex row tft array substrate is an example below, describes a kind of driving method of liquid crystal indicator, and is as shown in Figure 3, comprising:
301, after the lastrow pixel cell loads the grid cut-in voltage and before loading pixel voltage, load the grid cut-in voltage of current line pixel cell, make the said lastrow of same row and said current line pixel cell carry out self discharge.
302, after self discharge is accomplished, load the pixel voltage of said lastrow pixel cell, close the thin film transistor (TFT) TFT of said lastrow pixel cell after charging is accomplished.
303, load the grid cut-in voltage of next line pixel cell, make the said current line of same row and said next line pixel cell carry out self discharge.
304, after self discharge is accomplished, load the pixel voltage of said current line pixel cell, close the TFT of said current line pixel cell after charging is accomplished.
The embodiment of the invention is applicable to an inversion driving mode, line inversion driving mode and face inversion driving mode.
Below exemplarily using the example that is shown as of some inversion driving, the process of the driving method that adopts this liquid crystal indicator is described.
At first introduce the display mode of some inversion driving, as shown in Figure 4, for the display frame of same frame (for example, the i frame), the polarity of the pixel voltage of the pixel cell that the pixel voltage of each pixel cell is adjacent on its horizontal longitudinal direction is opposite; And for same pixel cell, next frame (for example, i+1 frame) is opposite in the pixel voltage polarity of this pixel cell with present frame (for example, i frame).
Example, be provided with N bar grid line, M bar data line in the display screen in the embodiment of the invention altogether.The driving process of the embodiment of the invention is as shown in Figure 5, and (it is example that 1≤n≤N) goes the driving method of pixel cell with n.At first; After the capable pixel cell data of n-1 line loads the grid cut-in voltage and before loading pixel voltage; Load the grid cut-in voltage of the capable pixel cell of n; Make the TFT source electrode and drain electrode conducting of the capable pixel cell of n,, make the capable pixel cell of n-1 and the capable pixel cell of n of same row carry out self discharge because the grid of the capable pixel cell of n-1 also is in opening.Need to prove, if n=1, then n-1=N; That is to say that for the pixel cell of first trip, the pixel cell of its lastrow is the pixel cell of footline.
Concrete, suppose that (the row pixel voltage of 1≤m≤M) is+U1 to m, and m is listed as the capable voltage of n-1 and is+U1, n behavior-U2, n+1 behavior+U3; Wherein U1, U2, U3 are positive voltages.Every capable grid shifts to an earlier date delegation's drive cycle to be opened, when upgrading the video data of the capable pixel cell of n-1, as shown in Figure 6; At t1 constantly, the grid that n is capable is opened in advance, and the TFT capable and the capable pixel cell of n of the n-1 on the then same column data line opens simultaneously; Because adjacent two row pixel cells are nearest, and the data degree of correlation of image is bigger, voltage magnitude difference is less; And polarity is opposite, thereby the internal electrical pressure reduction of adjacent two row pixel cells capable of using is realized the balance of voltage; The pixel voltage of two pixel cells reaches (U1-U2)/2, is the self discharge of the capable and capable pixel cell of n of n-1 this moment.
After discharge is accomplished, on data line, load the pixel voltage of the capable pixel cell of n-1, the capable and capable pixel cell of n charges simultaneously to n-1, closes the thin film transistor (TFT) TFT of the capable pixel cell of n-1 after charging is accomplished.
Concrete, after discharge is accomplished, with the data load of the capable pixel cell source electrode of n-1 to data line; This moment, the capable and capable pixel cell of n charged simultaneously to n-1; After the capable and capable pixel cell of n of n-1 reached new voltage-U1, charging was accomplished, at t2 constantly; Close the TFT of the capable pixel cell of n-1, then accomplished the Data Update of the capable pixel cell of n-1.
After closing the TFT of the capable pixel cell of n-1; Load the grid cut-in voltage of the capable pixel cell of n+1; Make the source electrode and drain electrode conducting of the capable pixel cell of n+1; Because the grid of the capable pixel cell of n also is in opening, makes the capable pixel cell of n and the capable pixel cell of n+1 of same row carry out self discharge.
Concrete; When upgrading the video data of the capable pixel cell of n, as shown in Figure 7, at t2 constantly; The grid that n+1 is capable is opened in advance; N on then same column data line TFT capable and the capable pixel cell of n+1 opens simultaneously, and the pixel voltage of two pixel cells reaches and (U1+U3)/2, is the self discharge of the capable and capable pixel cell of n+1 of n this moment.
After discharge is accomplished, on data line, load the pixel voltage of the capable pixel cell of n, the capable and capable pixel cell of n+1 charges simultaneously to n, closes the film crystal TFT of the capable pixel cell of n after charging is accomplished.
Concrete, after discharge is accomplished, with the data load of the capable pixel cell source electrode of n to data line; This moment, the capable and capable pixel cell of n+1 charged simultaneously to n; After the capable and capable pixel cell of n+1 of n reached new voltage+U2, charging was accomplished, at t3 constantly; Close the TFT of the capable pixel cell of n, then accomplished the Data Update of the capable pixel cell of n.
The embodiment of the invention, the driving process of the driving method of the liquid crystal indicator that employing line inversion driving shows is identical with said process, does not do repeat specification at this.
The process of the driving method of the liquid crystal indicator that use face inversion driving shows is with reference to shown in Figure 5.
At first introduce the display mode of face inversion driving, as shown in Figure 8, for the display frame of same frame (for example, the q frame), the polarity of the pixel voltage of the pixel cell that the pixel voltage of each pixel cell is adjacent on its horizontal longitudinal direction is identical; And for same pixel cell, next frame (for example, q+1 frame) is opposite in the pixel voltage polarity of this pixel cell with present frame (for example, q frame).
Be provided with N bar grid line, M bar data line in the display screen in the embodiment of the invention altogether, (it is example that 1≤n≤N) goes the driving method of pixel cell with n.Suppose that when the q frame pixel voltage of all pixel cells is+U1 that when the q+1 frame, the pixel voltage of all pixel cells is-U1 that wherein, U1 is a positive voltage.Every capable grid shifts to an earlier date delegation's drive cycle to be opened, when upgrading the video data of the capable pixel cell of n-1, before the capable pixel cell data of n-1 line record pixel voltage; The grid that n is capable is opened in advance, and the TFT capable and the capable pixel cell of n of the n-1 on the then same column data line opens simultaneously, because adjacent two row pixel cells are nearest; And the data degree of correlation of image is bigger, and voltage magnitude difference is less, and polarity is opposite; Thereby the internal electrical pressure reduction of adjacent two row pixel cells capable of using; Realizing that the balance of voltage, the pixel voltage of two pixel cells reach (U1+U1)/2, is the self discharge of the capable and capable pixel cell of n of n-1 this moment.
After discharge is accomplished; With the data load of the capable pixel cell source electrode of n-1 to data line; This moment, the capable and capable pixel cell of n charged simultaneously to n-1, and after the capable and capable pixel cell of n of n-1 reached new voltage-U1, charging was accomplished; Close the TFT of the capable pixel cell of n-1, then accomplished the Data Update of the capable pixel cell of n-1.
After closing the TFT of the capable pixel cell of n-1; Load the grid cut-in voltage of the capable pixel cell of n+1; The TFT of the capable pixel cell of n+1 is opened; Because the TFT of the capable pixel cell of n also is in opening, the pixel voltage of two pixel cells reaches and (U1+U2)/2, is the self discharge of the capable and capable pixel cell of n+1 of n this moment.
After discharge is accomplished; With the data load of the capable pixel cell source electrode of n to data line; This moment, the capable and capable pixel cell of n+1 charged simultaneously to n, and after the capable and capable pixel cell of n+1 of n reached new voltage-U1, charging was accomplished; Close the TFT of the capable pixel cell of n, then accomplished the Data Update of the capable pixel cell of n.
The embodiment of the invention provides a kind of driving method of liquid crystal indicator; Before the lastrow pixel cell loads pixel voltage; Through loading the grid cut-in voltage of current line pixel cell; Make the lastrow and the self discharge of current line pixel cell of same row, after waiting for the loading of lastrow pixel cell pixel voltage and accomplishing charging, close the TFT of lastrow pixel cell; Load the grid cut-in voltage of next line pixel cell, current line and the next line pixel cell of same row carried out self discharge, load the pixel voltage of current line pixel cell, accomplish the TFT that closes the current line pixel cell after charging.Thereby make that in the driving process of short duration self discharge process is arranged, so just reduced the duration of charging, and the grid of two adjacent lines do not had the shut-in time simultaneously, improved the utilization factor of time.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of said claim.
Claims (5)
1. the driving method of a liquid crystal indicator is characterized in that, comprising:
After the first row pixel cell loads the grid cut-in voltage and before loading pixel voltage, load the grid cut-in voltage of the second row pixel cell of same row, make said first row pixel cell and the said second row pixel cell carry out self discharge;
After self discharge is accomplished, load the said first row pixel cell pixel voltage, and after charging is accomplished, close the thin film transistor (TFT) TFT of first row.
2. method according to claim 1 is characterized in that, the grid that is spaced apart between said first row pixel cell grid cut-in voltage and the said second row pixel cell grid cut-in voltage is opened 1/2nd of duration.
3. method according to claim 1 is characterized in that, said first row pixel cell and the said second row pixel cell carry out self discharge and be specially:
It is 1/2nd of said first row pixel cell pixel voltage and the said second row pixel cell pixel voltage sum that said first row pixel cell and the said second row pixel cell carry out the balance of voltage.
4. method according to claim 1 is characterized in that, also comprises,
When loading the said first row pixel cell pixel voltage, said first row pixel cell and the said second row pixel cell are charged simultaneously.
5. according to the arbitrary described method of claim 1 to 4, it is characterized in that said driving method is specially:
After the lastrow pixel cell loads the grid cut-in voltage and before loading pixel voltage, load the grid cut-in voltage of current line pixel cell, make the said lastrow of same row and said current line pixel cell carry out self discharge;
After self discharge is accomplished, load the pixel voltage of said lastrow pixel cell, close the thin film transistor (TFT) TFT of said lastrow pixel cell after charging is accomplished;
Afterwards, load the grid cut-in voltage of next line pixel cell, make the said current line of same row and said next line pixel cell carry out self discharge;
After self discharge is accomplished, load the pixel voltage of said current line pixel cell, close the TFT of said current line pixel cell after charging is accomplished.
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| CN201110370171XA CN102654985A (en) | 2011-11-18 | 2011-11-18 | Drive method of liquid crystal display device |
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| CN201110370171XA CN102654985A (en) | 2011-11-18 | 2011-11-18 | Drive method of liquid crystal display device |
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| US20070097057A1 (en) * | 2005-10-31 | 2007-05-03 | Shin Jung W | Liquid crystal display and driving method thereof |
| CN101008724A (en) * | 2006-01-26 | 2007-08-01 | 三星电子株式会社 | Display device and driving apparatus thereof |
| US20090109157A1 (en) * | 2007-10-30 | 2009-04-30 | National Taiwan University | Dot-matrix display refresh charging/discharging control method and system |
| CN101669163A (en) * | 2007-04-27 | 2010-03-10 | 夏普株式会社 | Liquid crystal display device |
| US20110102309A1 (en) * | 2009-11-05 | 2011-05-05 | Young-Joon Cho | Thin film transistor display panel and method of manufacturing the same |
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- 2011-11-18 CN CN201110370171XA patent/CN102654985A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070097057A1 (en) * | 2005-10-31 | 2007-05-03 | Shin Jung W | Liquid crystal display and driving method thereof |
| CN101008724A (en) * | 2006-01-26 | 2007-08-01 | 三星电子株式会社 | Display device and driving apparatus thereof |
| CN101669163A (en) * | 2007-04-27 | 2010-03-10 | 夏普株式会社 | Liquid crystal display device |
| US20090109157A1 (en) * | 2007-10-30 | 2009-04-30 | National Taiwan University | Dot-matrix display refresh charging/discharging control method and system |
| US20110102309A1 (en) * | 2009-11-05 | 2011-05-05 | Young-Joon Cho | Thin film transistor display panel and method of manufacturing the same |
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Application publication date: 20120905 |