CN101315749B - Driving method of liquid crystal display - Google Patents
Driving method of liquid crystal display Download PDFInfo
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- CN101315749B CN101315749B CN2008100395814A CN200810039581A CN101315749B CN 101315749 B CN101315749 B CN 101315749B CN 2008100395814 A CN2008100395814 A CN 2008100395814A CN 200810039581 A CN200810039581 A CN 200810039581A CN 101315749 B CN101315749 B CN 101315749B
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- liquid crystal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2230/00—Details of flat display driving waveforms
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/067—Special waveforms for scanning, where no circuit details of the gate driver are given
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Abstract
The invention discloses a driving method of a liquid crystal display, and the liquid crystal display at least comprises a time schedule controller, a source driver, a grid driver, a plurality of data lines, a plurality of gate lines and a display panel including a plurality of liquid crystal units, wherein, the output of the grid driver comprises scanning signals of a gate potential Von, a close potential Voff and a chamfer potential Vsh. The driving method including the following steps: a) the time schedule controller provides data to the source driver; b) the source driver exerts data signals with different polarities on the data lines, and ensures the polarities of the data signals of each row of liquid crystal units at neighboring lines to be same or opposite; c) if the polarities of the data signals at the current line is the same as those of the data signals at the last line, then the grid driver outputs a second scanning signal; otherwise, the grid driver outputs a first scanning signal. The chamfer potential Vsh1 of the first scanning signal is bigger than the chamfer potential Vsh2 of the second scanning signal, thus leading the charging speed of each liquid crystal unit to be basically consistent with each other; and d) the step c is repeated till the first scanning signal or the second scanning signal is exerted on all the gate lines. The driving method of the liquid crystal display provided by the invention can adjust the charging speed and the Feedthrough voltage of two continual liquid crystal units, thereby achieving the aim of balancing the luminance difference.
Description
Technical field
The present invention relates to a kind of driving method of LCD, relate in particular to a kind of driving method of Thin Film Transistor-LCD.
Background technology
LCD (LCD) is to utilize the variation that is clipped in electric field intensity on the liquid crystal molecule, and the power that changes the orientation control printing opacity of liquid crystal molecule is come display image.At present, LCD since its have in light weight, volume is little, thin thickness, be used in widely in the various big-and-middle undersized terminal presentation facilities.In general, LCD comprises LCD panel with picture element matrix and the driving circuit that is used to drive this LCD panel.
As shown in Figure 1, LCD comprises: display panels 11, and it has picture element matrix; Gate drivers 12 is used for the gate lines G L of display panels 11 is driven gating; Source electrode driver 13 is used for the data line DL of display panels 11 is driven; At display panels 11, there is liquid crystal cells Clc in each zone that between gate lines G L and data line DL, intersects, this liquid crystal cells Clc becomes matrix distribution in display panels 11; In the zone of this intersection, also there is a thin film transistor (TFT) TFT, when the residing gate lines G L of TFT was transfused to Von electric potential signal gating TFT, the data-signal Vdata of data line DL charged into liquid crystal cells Clc; When the residing gate lines G L of TFT is transfused to the Voff electric potential signal when closing TFT, the data-signal that has charged into is kept by Cs; Liquid crystal cells Clc changes the state of liquid crystal according to the data-signal that keeps, and shows to realize GTG thereby control transmittance.
In order to promote display quality, in the driving of gate lines G L, not only used the Von of switching TFT and the electric potential signal of Voff, the also normal RC that uses top rake current potential Vsh to reach balanced gate line GL postpone and the grid source electrode stray capacitance of TFT to the influence of Feedthrough (feedthrough) voltage.The difference of the data-signal of the actual maintenance of Cs when data-signal Vdata that data line DL applied when Feedthrough voltage was defined as the TFT gating here and TFT close.The type of drive of common use top rake current potential Vsh as shown in Figure 2.TFT on gate lines G L is by in the time of gating, and the time originally is the gating current potential with Von, and remaining time is switched to Vsh by Von.When the gating current potential of gate lines G L was Vsh, the TFT on the gate line was equally by gating, but the charging current of TFT is low when being the gating current potential than Von.
Because the characteristic of liquid crystal material itself needs to adopt various reversing mode to drive display panels, by periodically being reversed in the polarity of charging data in each liquid crystal cells, reduces flicker and image retention.Because the state of liquid crystal is controlled with the voltage difference of public electrode current potential by the data-signal Vdata that liquid crystal cells is charged into, and controls the transmitance of light then; When voltage difference is timing, definition charging data are positive polarity; When voltage difference when negative, definition charging data are negative polarity.Can be consuming time in balance flicker level and source drive, a kind of 2 line reversing mode commonly used.2 line reversing mode as shown in Figure 3.In 2 line reversing mode, the data-signal that is provided to the liquid crystal cells of horizontal direction arrangement has opposite polarity with the interval of a liquid crystal cells respectively, and the data-signal that is provided to the liquid crystal cells of vertical direction arrangement has opposite polarity with the interval of two liquid crystal cells respectively.Reverse to the polarity of each data-signal in interval at every frame, as shown in Figure 3, each data-signal is opposite in the polarity of Fn frame and Fn+1 frame.
Because data-signal is identical to the duration of charging T of each liquid crystal cells, when adopting above-mentioned 2Line reversing mode, source electrode driver is provided to data line with positive data signal at continuous twice T in the cycle, afterwards, in cycle the negative data signal is provided to data line at ensuing twice T, and circulation so successively.Therefrom, be not difficult to find out the problem of using 2 line reversing mode to occur easily, promptly when adopting positive data signal to charge, second liquid crystal cells charging in two liquid crystal cells carried out comparatively rapidly, and first liquid crystal cells is because its previous liquid crystal cells is a negative polarity, therefore, the charging rate of first liquid crystal cells is slower than second liquid crystal cells; When adopting the negative data signal to charge, exist too, the charging rate of first liquid crystal cells is than second problem that liquid crystal cells is slow.Therefore, when adopting 2 line reversing mode, luminance difference appears in continuous two liquid crystal cells easily.
Summary of the invention
Technical matters to be solved by this invention provides a kind of driving method at the LCD that adopts 2 line reversing mode, avoids continuous two liquid crystal cells luminance difference to occur because of charging rate is different.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of method for driving liquid crystal display, described LCD comprises time schedule controller at least, source electrode driver, gate drivers, many data lines, many gate lines and the display panel that contains a plurality of liquid crystal cells, described gate drivers output comprises gating current potential Von, close the sweep signal of current potential Voff and top rake current potential Vsh, said method comprising the steps of:
A) time schedule controller provides data to source electrode driver;
B) source electrode driver apply opposed polarity data-signal in data line, in each frame, described data-signal has opposite polarity with the interval of a liquid crystal cells in the horizontal direction, has opposite polarity in vertical direction with the interval of two liquid crystal cells; The polarity of described data-signal is reversed at the interval of every frame;
C) if the polarity of the data-signal of the data-signal of current line and lastrow is identical, gate drivers is then exported second sweep signal, if then export first sweep signal on the contrary, the top rake current potential Vsh1 of described first sweep signal is greater than the top rake current potential Vsh2 of described second sweep signal, makes the charging rate basically identical of each liquid crystal cells;
D) repeating step c is until applying first sweep signal or second sweep signal in all gate lines.
In the driving method of above-mentioned LCD, the duration of the gating current potential Von of described first sweep signal is greater than the duration of the gating current potential Von of described second sweep signal.
In the driving method of above-mentioned LCD, described gating current potential Von directly switches or linearity switches to top rake current potential Vsh.
The present invention contrasts prior art following beneficial effect: the present invention is by adjusting first sweep signal and second sweep signal, respectively adjacent gate lines is provided the sweep signal of different band top rake current potential, thereby adjust the charging rate and the Feedthrough voltage of continuous two liquid crystal cells, reach the purpose of equilbrium brightness difference.
Description of drawings
Fig. 1 is existing liquid crystal display device structure synoptic diagram.
Fig. 2 is existing gate driving synoptic diagram with top rake function.
Fig. 3 is the synoptic diagram of existing 2 line inversion driving patterns.
Fig. 4 is an one scan signal waveforms of the present invention.
Fig. 5 is another sweep signal oscillogram of the present invention.
Among the figure:
11 display panels, 12 gate drivers, 13 source electrode drivers
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 4 is an one scan signal waveforms of the present invention;
See also Fig. 4, when display panels adopts the pattern of 2 lines counter-rotating, the data-signal that is provided to the liquid crystal cells of horizontal direction arrangement has opposite polarity with the interval of a liquid crystal cells respectively, and the data-signal that is provided to the liquid crystal cells of vertical direction arrangement has opposite polarity with the interval of two liquid crystal cells respectively.Reverse to the polarity of each data-signal in interval at every frame, specifically as shown in Figure 3.Suppose GL1 and GL2 two row, each liquid crystal cells that lists adopts the data-signal of identical polar, to GL2 and GL3 two row, each liquid crystal cells that lists adopts the data-signal of opposite polarity, to GL3 and GL4 two row, each liquid crystal cells that lists adopts the data-signal of identical polar, by that analogy, to two adjacent row, the data-signal polarity of each row liquid crystal cells is all identical or all opposite, so can provide different sweep signals to each row, is respectively first sweep signal or second sweep signal, with compensate for parasitic capacitance influence, make the charging rate basically identical of each liquid crystal cells.Described first sweep signal has different top rake current potentials with second sweep signal, is respectively Vsh1 and Vsh2, and Vsh1 and Vsh2 are unequal.Specifically as shown in Figure 4, odd-numbered line GL1, GL3 ..., GLm-1 adopts first sweep signal to drive, even number line GL2, and GL4 ..., GLm adopts second sweep signal to drive.To GL1 and GL2, the data-signal polarity of these two capable upward liquid crystal cells at each row place is identical, so last each the liquid crystal cells charging rate of GL2 is very fast; And to GL2 and GL3, the data-signal polarity that this two row is gone up each liquid crystal cells that is listed as the place is opposite, be subjected to GL2 capable on the influence of liquid crystal cells, under identical sweep signal, last each the liquid crystal cells charging rate of GL3 is slower, because charge cycle is identical, different charging rates influence the charging current of TFT, and then influence Feedthrough voltage, cause continuous up and down two liquid crystal cells of adjacent lines luminance difference to occur.By adjusting top rake current potential Vsh1 and Vsh2, make Vsh1 greater than Vsh2, promptly the driving force of first sweep signal can be adjusted liquid crystal cells charging rate speed greater than second sweep signal, with compensate for parasitic capacitance influence, make the charging rate basically identical of each liquid crystal cells.The present invention is to continuous two liquid crystal cells of the vertical direction of same polarity, first sweep signal or second sweep signal are provided respectively, by adjusting the top rake current potential of first sweep signal and second sweep signal, in the time of can be to 2 line reversing mode, continuous two liquid crystal cells compensate because of the problem that luminance difference appears in the charging rate difference.
Fig. 5 is another sweep signal oscillogram of the present invention.
See also Fig. 5,, the different Von duration, also can influence the charging current of TFT except different top rake current potentials can influence the charging current of Feedthrough voltage and TFT.Gate driving mode shown in Figure 5, the time point that sweep signal Voff switches to Von is defined as t1, and the time point that top rake current potential Vsh switches to Voff is defined as t2, and the time from t1 to t2 is that the TFT of each liquid crystal cells is by the time T of gating.In gating time T, the different time point t3 that switches from Von to top rake current potential Vsh is the promptly different Von duration, also different to the charging current influence of TFT.To first sweep signal and second sweep signal, adjust from Von to top rake current potential Vsh the time point t3 that switches respectively and also can adjust charging rate liquid crystal cells.In addition, gating current potential Von can be directly switch to top rake current potential Vsh, also can linearity switches to top rake current potential Vsh so that accurately charging rate is adjusted more flexibly.
The driving method of the LCD that present embodiment provides, by adjusting first sweep signal and second sweep signal, respectively adjacent gate lines is provided the sweep signal of different band top rake current potential, thereby adjust the charging rate and the Feedthrough voltage of continuous two liquid crystal cells, reach the purpose of equilbrium brightness difference.
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. the driving method of a LCD, described LCD comprises time schedule controller at least, source electrode driver, gate drivers, many data lines, many gate lines and the display panel that contains a plurality of liquid crystal cells, described gate drivers output comprises gating current potential Von, close the sweep signal of current potential Voff and top rake current potential Vsh, said method comprising the steps of:
A) time schedule controller provides data to source electrode driver;
B) source electrode driver apply opposed polarity data-signal in data line, in each frame, described data-signal has opposite polarity with the interval of a liquid crystal cells in the horizontal direction, has opposite polarity in vertical direction with the interval of two liquid crystal cells; The polarity of described data-signal is reversed at the interval of every frame;
C) if the polarity of the data-signal of the data-signal of current line and lastrow is identical, gate drivers is then exported second sweep signal, if then export first sweep signal on the contrary, the top rake current potential Vsh1 of described first sweep signal is greater than the top rake current potential Vsh2 of described second sweep signal, makes the charging rate basically identical of each liquid crystal cells;
D) repeating step c is until applying first sweep signal or second sweep signal in all gate lines.
2. the driving method of LCD according to claim 1 is characterized in that, the duration of the gating current potential Von of described first sweep signal is greater than the duration of the gating current potential Von of described second sweep signal.
3. the driving method of LCD according to claim 1 is characterized in that, described gating current potential Von directly switches or linearity switches to top rake current potential Vsh.
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| CN2008100395814A CN101315749B (en) | 2008-06-26 | 2008-06-26 | Driving method of liquid crystal display |
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| CN2008100395814A CN101315749B (en) | 2008-06-26 | 2008-06-26 | Driving method of liquid crystal display |
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| CN101315749B true CN101315749B (en) | 2010-06-16 |
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Effective date of registration: 20110623 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. |