CN105448255A - Liquid crystal display device and driving method therefor - Google Patents
Liquid crystal display device and driving method therefor Download PDFInfo
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- CN105448255A CN105448255A CN201510823168.7A CN201510823168A CN105448255A CN 105448255 A CN105448255 A CN 105448255A CN 201510823168 A CN201510823168 A CN 201510823168A CN 105448255 A CN105448255 A CN 105448255A
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Abstract
The invention discloses a liquid crystal display device and a driving method therefor. The device comprises a pixel array which comprises a plurality of pixels arranged in rows and columns, wherein each pixel comprises a thin film transistor, pixel capacitors, and liquid crystal molecular layers located among the pixel capacitors; a grid drive circuit which is connected with a plurality of grid scanning lines, and is used for providing grid voltages according to the grids of the thin film transistors of the pixels in the corresponding row; and a source electrode drive circuit which is connected with a plurality of source electrode data lines, and is used for providing the source electrode voltages for the thin film transistors of the pixels in the corresponding columns so as to set the display voltage across pole plates of the pixel capacitors. The device drives the pixels row by row in each frame period, and compensates the source electrode voltages according to the feed through voltage differences between different pixels. The device improves the image quality through the compensation of feed through voltage differences between different pixels.
Description
Technical field
The present invention relates to display technique field, more specifically, relate to liquid crystal indicator and driving method thereof.
Background technology
Liquid crystal indicator is the display device that the phenomenon utilizing the orientation of liquid crystal molecule to change under the work of electric field changes light source transmittance.Liquid crystal indicator has been widely used in the mobile terminal of such as mobile phone and the large scale display panel of such as flat panel TV.
Fig. 1 and 2 illustrates structural representation according to the liquid crystal indicator of prior art and equivalent circuit diagram respectively.The first surface that liquid crystal indicator 100 comprises the first glass substrate 110 and the second glass substrate 210, first glass substrate 110 is relative with the first surface of the second glass substrate 210.The first surface of the first glass substrate 110 is formed many controlling grid scan lines 111 intersected with each other and many source electrode data lines 112 are set, arrange at the crossover location of the two and select thin film transistor (TFT) 113 and pixel electrode 114.Public electrode 211 is formed at the first surface of the second glass substrate 210.Comprise liquid crystal layer between pixel electrode 114 and public electrode 211, pixel capacitance CLC can be equivalent to.Via controlling grid scan line 111 gating thin film transistor (TFT) 113, and via source electrode data line 112, the voltage corresponding with GTG is applied to pixel capacitance CLC, thus the orientation of change liquid crystal molecule is to realize the brightness of corresponding GTG.In order to keep voltage between the update cycle of pixel, pixel capacitance CLC can memory capacitance Cs in parallel to obtain the longer retention time.Gate drivers 310 is connected to many controlling grid scan lines 111, for providing grid voltage Vg1 to Vgm.Described source electrode driver 410 is connected to many source electrode data lines 112, for providing source pole tension Vs1 to Vsn.In liquid crystal indicator 100, because thin film transistor (TFT) 113 also exists gate-source parasitic capacitance Cgs, therefore the change of grid voltage produces feedthrough (feedthrough) phenomenon, makes pixel electrode voltage lower than preset value, thus occur that brightness disproportionation weighs, cause flicker.In the driving method of prior art, suppose that feed-trough voltage is all equal at the different pixels place of whole panel, public electrode 211 is set to the negative value of feed-trough voltage, to compensate the GTG deviation caused thus.
But the thickness of liquid crystal indicator is more and more thinner and frame is more and more narrow, display area can be increased when not increasing physical dimension, thus tailored appearance is attractive in appearance, is conducive to improving user's viewing experience.For this reason, multiple GIA element circuit can be adopted to replace controlling grid scan line independent of each other.Multiple GIA element circuit forms integrated gate drive circuitry (gatedriverinarray, be abbreviated as GIA), provide grid voltage to controlling grid scan line step by step, thus reduce the quantity of grid wiring, correspondingly reduce the area occupied of grid wiring, to realize narrow frame display device.According to the direction of transfer of grid voltage, described multiple GIA element circuit displacement starts step by step, thus provides grid voltage from prime controlling grid scan line step by step to rear class controlling grid scan line.Fig. 3 and Fig. 4 illustrates respectively and adopts the schematic diagram of liquid crystal indicator of integrated gate drive circuitry and the oscillogram of the clock signal of different controlling grid scan line, illustrated therein is for providing three controlling grid scan lines of grid voltage Vg1 to Vg3 and three source electrode data lines for providing source pole tension Vs1 to Vs3, pixel is expressed as P1 to P9.Be appreciated that each pixel comprises thin film transistor (TFT), pixel electrode and public electrode as shown in Figure 1, and optional memory capacitance.
Due to the principle of work of integrated gate drive circuitry, the grid voltage that controlling grid scan line not at the same level receives is no longer desirable constant waveform.As shown in Figure 4, the controlling grid scan line of rear class is relative to the grid voltage generation wave form distortion of the controlling grid scan line of prime and time delay.Therefore, grid voltage is subject to the position influence of controlling grid scan line.Be unequal at pixel P1 to P9 feed-trough voltage everywhere, need to compensate respectively.In addition, even if liquid crystal indicator does not adopt integrated gate drive circuitry, large size panel is the easy difference occurring feed-trough voltage at different location of pixels also.If adopt public electrode to compensate, be then difficult to compensate respectively for each pixel, thus the compensation of the feed-trough voltage of some pixel is wrong, causes the problem such as film flicker (flicker) and local image retention.
In addition, suitable tft placement has been adopted, the feed-trough voltage fluctuation adopting gradual gate-source parasitic capacitance Cgs to compensate to be caused by grid voltage difference.But the program is based on the design of circuit structure and function, if analog computation misalignment, compensation effect even runs counter to desire.This precompensation scheme does not allow to modify after product encapsulation yet, thus limits its range of application.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of liquid crystal indicator of source voltage being compensated according to location of pixels and driving method thereof, to revise the difference of the feed-trough voltage of different pixels position.
According to a first aspect of the invention, a kind of liquid crystal indicator is provided, comprise: pel array, comprise the multiple pixels by row and column arrangement, each pixel in described multiple pixel comprises thin film transistor (TFT), pixel capacitance and the layer of liquid crystal molecule between the pole plate of pixel capacitance; Gate driver circuit, is connected with many controlling grid scan lines, and the grid for the thin film transistor (TFT) of the pixel to corresponding line in described multiple pixel provides grid voltage; And source electrode drive circuit, be connected with many source electrode data lines, for the source electrode providing source pole tension of the thin film transistor (TFT) of the pixel to respective column in described multiple pixel thus the display voltage between the pole plate arranging described pixel capacitance, wherein, described liquid crystal indicator drives each pixel column line by line in each frame period, and according to the feed-trough voltage disparity compensation source voltage of different pixels position.
Preferably, the feed-trough voltage disparity compensation source voltage that described liquid crystal indicator is also relevant according to different GTG.
Preferably, described source electrode drive circuit according to sweep trace line order number search look-up table, to obtain the compensation rate of the source voltage of pixel, and according to described compensation rate correction source voltage.
Preferably, described liquid crystal indicator also comprises source electrode compensating circuit, described source electrode compensating circuit comprises multiple correction resistance of different resistance, described source electrode compensating circuit receives described source voltage from described source electrode drive circuit, according to sweep trace line order number, selected for source voltage correction resistance is provided to the source electrode of the thin film transistor (TFT) of respective pixel.
Preferably, described liquid crystal indicator also comprises gamma compensating circuit, described gamma compensating circuit comprises multiple gamma resistance of series connection, described gamma compensating circuit receives described source voltage from described source electrode drive circuit, different gamma resistance is selected, with source voltage according to the feed-trough voltage disparity compensation of different pixels position according to luma data and location of pixels.
Preferably, described gamma compensating circuit also comprises at least one and corrects resistance, and in the time period at least partially in each frame period, at least one at least one gamma resistance corrected in resistance and described multiple gamma resistance described is connected in parallel.
Preferably, described gamma compensating circuit also comprises multiple correction resistance, according to luma data and location of pixels, selects corresponding at least one gamma resistance corrected in resistance and described multiple gamma resistance to be connected in parallel from described multiple correction resistance.
According to a second aspect of the invention, a kind of driving method of liquid crystal indicator is provided, described liquid crystal indicator comprises the multiple pixels being arranged in pel array by row and column, described method comprises: in each frame period, drive each pixel column line by line, and according to the feed-trough voltage disparity compensation source voltage of different pixels position.
Preferably, drive the step of each pixel column to comprise: for each pixel, obtain source voltage according to luma data; The gamma resistance of different resistance values is selected according to both luma data and location of pixels; According to luma data and location of pixels, from multiple correction resistance, corresponding correction resistance and described gamma resistance is selected to be connected in parallel; And described source voltage is supplied to described pixel by selected gamma resistance, wherein, described gamma resistance carries out nonlinear compensation according to the image of gamma curve to display.
Preferably, according to different pixels position by compensating source electrode voltage of tabling look-up.
This liquid crystal indicator and driving method thereof according to the feed-trough voltage compensating source electrode voltage of each pixel, therefore, can adapt to the liquid crystal indicator of all kinds and/or size independently, thus compensate the difference of the feed-trough voltage of different pixels position.By compensating the feed-trough voltage difference of different pixels, image quality can be promoted.In addition, this driving method does not need to compensate common electric voltage in addition, thus allows public electrode ground connection or apply constant common electric voltage, thus can simplify the driving circuit of public electrode, reduce its power consumption.
Accompanying drawing explanation
By referring to the description of accompanying drawing to the embodiment of the present invention, above-mentioned and other objects of the present invention, feature and advantage will be more clear, in the accompanying drawings:
Fig. 1 and 2 illustrates structural representation according to the liquid crystal indicator of prior art and equivalent circuit diagram respectively;
Fig. 3 and Fig. 4 illustrates respectively and adopts the schematic diagram of liquid crystal indicator of integrated gate drive circuitry and the oscillogram of the clock signal of different controlling grid scan line;
Fig. 5 illustrates the feed-trough voltage curve of different pixels in the liquid crystal display apparatus driving circuit according to the first embodiment of the present invention;
Fig. 6 illustrates the equivalent circuit diagram of liquid crystal indicator according to a second embodiment of the present invention;
Fig. 7 illustrates the equivalent circuit diagram of liquid crystal indicator according to the third embodiment of the invention;
Fig. 8 illustrates the equivalent circuit diagram of liquid crystal indicator according to a fourth embodiment of the invention;
Fig. 9 illustrates the internal circuit configuration of gamma compensating circuit in liquid crystal indicator according to a fourth embodiment of the invention;
Figure 10 and 11 illustrates the oscillogram of the driving method of two different pixels positions respectively.
Embodiment
Hereinafter with reference to accompanying drawing, various embodiment of the present invention is described in more detail.In various figures, identical element adopts same or similar Reference numeral to represent.For the sake of clarity, the various piece in accompanying drawing is not drawn in proportion.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Fig. 5 illustrates the feed-trough voltage curve of different pixels in the liquid crystal display apparatus driving circuit according to the first embodiment of the present invention.The feed-trough voltage Vft of 9 pixel P1 to P9 under different GTG as shown in Figure 3 shown in Figure 5, illustrates the feed-trough voltage of 9 exemplary position of liquid crystal indicator with example.In liquid crystal indicator, multiple pixel is arranged in array by row and column.Each pixel comprises thin film transistor (TFT), the pixel capacitance be made up of pixel electrode and public electrode, layer of liquid crystal molecule between pixel electrode and public electrode.The grid of the thin film transistor (TFT) of multiple pixels of going together mutually is connected to same controlling grid scan line jointly, and the source electrode of the thin film transistor (TFT) of multiple pixels of same column is connected to same source electrode data line jointly.When driving many controlling grid scan lines step by step, the controlling grid scan line driven at first in each frame period is work first sweep trace.When driving many controlling grid scan lines at the same time, near the controlling grid scan line of gate drivers as the first sweep trace.Owing to driving many source electrode data lines in liquid crystal indicator simultaneously, therefore near the source electrode data line of source electrode driver as the first data line.Define the controlling grid scan line of subsequent rows and the source electrode data line of subsequent column similarly.See Fig. 3, three pixel P1 to P3 are positioned at the first row, are jointly connected to the first sweep trace, and three pixel P4 to P6 are positioned at the second row, are jointly connected to the second sweep trace, and three pixel P7 to P9 are positioned at the third line, are jointly connected to three scan line.In this application, location of pixels can be defined by the row and column sequence number in pel array.
As shown in Figure 5, related both feed-trough voltage Vtf and location of pixels and GTG.When same gray level, the feed-trough voltage Vft of the first pixel column and the non-significant change of feed-trough voltage Vft of the second pixel column, but the feed-trough voltage Vtf of the 3rd pixel column enlarges markedly.At identical location of pixels, the feed-trough voltage Vft of each pixel increases along with the rising of GTG.Different from the method that prior art pin adopts public electrode to compensate, the driving method of liquid crystal indicator adopts source voltage compensation scheme according to an embodiment of the invention.In this driving method, each frame period carries out the scanning of described multiple pixel column, thus drives each pixel column line by line.When scanning each pixel column, according to GTG and location of pixels correction source voltage.This driving method independently according to the feed-trough voltage compensating source electrode voltage of each pixel, thus can compensate the difference between liquid crystal indicator different pixels.
For liquid crystal indicator that is dissimilar and/or size, can measure in advance or feed-trough voltage under the different pixels position of simulated solution crystal device and different GTG, obtain the feed-trough voltage curve shown in Fig. 5, this feed-trough voltage curve can be stored as look-up table in liquid crystal indicator.In the example shown in Fig. 5, if GTG is identical, then the feed-trough voltage of the pixel column finally driven in each frame period is higher than the pixel column driven at first.In addition, for same pixel, in the different frame cycle, the feed-trough voltage of higher then this pixel of GTG is higher.In the liquid crystal indicator of other type, feed-trough voltage curve may difference to some extent, and such as, if GTG is identical, then the feed-trough voltage of the pixel column driven at first in each frame period is less than the last pixel column driven.
In an example, this driving method, in each frame period, drives each pixel column line by line, comprises the following steps: the feed-trough voltage difference according to multiple pixels of diverse location forms look-up table; For each pixel, obtain sweep trace line order number and luma data; According to sweep trace line order number search look-up table, to obtain the compensation rate of the source voltage of this pixel; According to the source voltage of this pixel of compensation rate correction of source voltage.The look-up table that this driving method uses is the function between pixel column sequence number and source voltage compensation rate, thus can compensate the difference of the feed-trough voltage that different pixels row causes.
In another example, this driving method, in each frame period, drives each pixel column line by line, comprises the following steps: the feed-trough voltage difference according to multiple pixels of diverse location forms look-up table; For each pixel, obtain sweep trace line order number and luma data; According to sweep trace line order number search look-up table, to obtain the luma data through revising of this pixel; The source voltage through revising is obtained according to the luma data revised.The look-up table that this driving method uses is the function between pixel column sequence number and luma data modified value, thus the difference that the feed-trough voltage that can compensate different pixels row causes.
In another example, this driving method, in each frame period, drives each pixel column line by line, comprises the following steps: the feed-trough voltage difference according to multiple pixels of diverse location forms look-up table; For each pixel, obtain sweep trace line order number and luma data; Look-up table is searched for luma data, to obtain the source voltage through revising of this pixel according to sweep trace line order number.The look-up table that this driving method uses is pixel column sequence number and the function between luma data and source voltage modified value, thus can compensate the difference of the feed-trough voltage that different pixels row and different luma data cause.
In another example, this driving method, in each frame period, drives each pixel column line by line, comprises the following steps: the feed-trough voltage difference according to multiple pixels of diverse location forms look-up table; For each pixel, obtain sweep trace line order number, data alignment sequence number and luma data; According to sweep trace line order number, data alignment sequence number and luma data search look-up table, to obtain the source voltage through revising of this pixel.The look-up table that this driving method uses is pixel column sequence number, data alignment sequence number and the function between luma data and source voltage modified value, thus can compensate the difference of the feed-trough voltage that different pixels row, different pixels row and different luma data cause.
In another example, this driving method, in each frame period, drives each pixel column line by line, comprises the following steps: for each pixel, obtains sweep trace line order number and luma data; Source voltage is obtained according to luma data; According to sweep trace line order number, source voltage is provided to this pixel via the correction resistance of different resistance values, to obtain the source voltage through revising of this pixel.This driving method connects the correction resistance of different resistance values according to pixel column sequence number, thus the difference that the feed-trough voltage that can compensate different pixels row causes.
Because the driving method of the application independently according to the feed-trough voltage compensating source electrode voltage of each pixel, therefore, can adapt to the liquid crystal indicator of all kinds and/or size, thus compensate the difference of the feed-trough voltage of different pixels position.In addition, this driving method does not need to compensate common electric voltage in addition, thus allows public electrode ground connection or apply constant common electric voltage, thus can simplify the driving circuit of public electrode, reduce its power consumption.
Fig. 6 illustrates the equivalent circuit diagram of liquid crystal indicator according to a second embodiment of the present invention.The structure of this liquid crystal indicator is identical with Fig. 1, but driving circuit is different.In liquid crystal indicator, multiple pixel is arranged in array by row and column.Each pixel comprises thin film transistor (TFT), the pixel capacitance be made up of pixel electrode and public electrode, layer of liquid crystal molecule between pixel electrode and public electrode.The grid of the thin film transistor (TFT) of multiple pixels of going together mutually is connected to same controlling grid scan line jointly, and the source electrode of the thin film transistor (TFT) of multiple pixels of same column is connected to same source electrode data line jointly.
Gate drivers 310 is connected to m bar controlling grid scan line, for providing grid voltage Vg1 to Vgm.Source electrode driver 410 is connected to n bar source electrode data line, for providing source pole tension Vs1_ctrl to Vsn_ctrl.Compared with the liquid crystal indicator of the prior art shown in Fig. 1, according to the source electrode driver 410 of the liquid crystal indicator of this embodiment when generating source voltage according to luma data, obtain the feed-trough voltage of different pixels further according to location of pixels and GTG, thus revise source voltage.In each frame period of liquid crystal indicator, drive each pixel column line by line, and individual element correction source voltage, thus the difference of the feed-trough voltage of different pixels position can be compensated independently.
In addition, this liquid crystal indicator does not need to compensate common electric voltage in addition, thus allows public electrode ground connection or apply constant common electric voltage, thus can simplify the driving circuit of public electrode and reduce its power consumption.
Fig. 7 illustrates the equivalent circuit diagram of liquid crystal indicator according to the third embodiment of the invention.The structure of this liquid crystal indicator is identical with Fig. 1, but driving circuit is different.In liquid crystal indicator, multiple pixel is arranged in array by row and column.Each pixel comprises thin film transistor (TFT), the pixel capacitance be made up of pixel electrode and public electrode, layer of liquid crystal molecule between pixel electrode and public electrode.The grid of the thin film transistor (TFT) of multiple pixels of going together mutually is connected to same controlling grid scan line jointly, and the source electrode of the thin film transistor (TFT) of multiple pixels of same column is connected to same source electrode data line jointly.
Gate drivers 310 is connected to m bar controlling grid scan line, for providing grid voltage Vg1 to Vgm.Source electrode driver 410 is connected to source electrode compensating circuit 420, for latter providing source pole tension Vs1-Vsn.Source electrode compensating circuit 420 is connected to n bar source electrode data line, for providing source pole tension Vs1_ctrl-Vsn_ctrl.Compared with the liquid crystal indicator of the prior art shown in Fig. 1, comprise additional source electrode compensating circuit 420 according to the liquid crystal indicator of this embodiment.Source electrode driver 410 generates source voltage Vs1-Vsn according to luma data.Source electrode compensating circuit 420 obtains the feed-trough voltage of different pixels further according to location of pixels and GTG, obtain the source voltage Vs1_ctrl-Vsn_ctrl revised.In each frame period of liquid crystal indicator, drive each pixel column line by line, and individual element correction source voltage, thus the difference of the feed-trough voltage of different pixels position can be compensated independently.
In addition, this liquid crystal indicator does not need to compensate common electric voltage in addition, thus allows public electrode ground connection or apply constant common electric voltage, thus can simplify the driving circuit of public electrode and reduce its power consumption.
The above-mentioned liquid crystal indicator according to the second embodiment and the 3rd embodiment adopts built-in control module or the source voltage of external independent circuits to pixel to compensate respectively.Below only for the 3rd embodiment, its control principle is described.
In an example, source electrode compensating circuit 420 comprises register, for storing the look-up table formed according to the feed-trough voltage difference of multiple pixels of diverse location.In each frame period, drive each pixel column line by line.Source electrode compensating circuit 420, for each pixel, obtains sweep trace line order number and luma data; According to sweep trace line order number search look-up table, to obtain the compensation rate of the source voltage of this pixel; According to the source voltage of this pixel of compensation rate correction of source voltage.The look-up table that source electrode compensating circuit 420 uses is the function between pixel column sequence number and source voltage compensation rate, thus can compensate the difference of the feed-trough voltage that different pixels row causes.
In another example, this driving method, in each frame period, drives each pixel column line by line.Source electrode compensating circuit 420, for each pixel, obtains sweep trace line order number and luma data; According to sweep trace line order number search look-up table, to obtain the source voltage through revising of this pixel.The look-up table that this driving method uses is the function between pixel column sequence number and source voltage modified value, thus the difference that the feed-trough voltage that can compensate different pixels row causes.
In another example, source electrode compensating circuit 420 comprises register, for storing the look-up table formed according to the feed-trough voltage difference of multiple pixels of diverse location.In each frame period, drive each pixel column line by line.Source electrode compensating circuit 420, for each pixel, obtains sweep trace line order number and luma data; Look-up table is searched for luma data, to obtain the source voltage through revising of this pixel according to sweep trace line order number.The look-up table that this driving method uses is pixel column sequence number and the function between luma data and source voltage modified value, thus can compensate the difference of the feed-trough voltage that different pixels row and different luma data cause.
In another example, source electrode compensating circuit 420 comprises register, for storing the look-up table formed according to the feed-trough voltage difference of multiple pixels of diverse location.In each frame period, drive each pixel column line by line.Source electrode compensating circuit 420, for each pixel, obtains sweep trace line order number, data alignment sequence number and luma data; According to sweep trace line order number, data alignment sequence number and luma data search look-up table, to obtain the source voltage through revising of this pixel.The look-up table that this driving method uses is pixel column sequence number, data alignment sequence number and the function between luma data and source voltage modified value, thus can compensate the difference of the feed-trough voltage that different pixels row, different pixels row and different luma data cause.
In another example, source electrode compensating circuit 420 comprises the correction resistance of register and multiple different resistance.Register is for storing the look-up table formed according to the feed-trough voltage difference of multiple pixels of diverse location.In each frame period, drive each pixel column line by line.Source electrode compensating circuit 420, for each pixel, obtains sweep trace line order number and luma data; Source voltage is obtained according to luma data; According to sweep trace line order number, source voltage is provided to this pixel via the correction resistance of different resistance values, to obtain the source voltage through revising of this pixel.This driving method connects the correction resistance of different resistance values according to pixel column sequence number, thus the difference that the feed-trough voltage that can compensate different pixels row causes.
Fig. 8 illustrates the equivalent circuit diagram of liquid crystal indicator according to a fourth embodiment of the invention.The structure of this liquid crystal indicator is identical with Fig. 1, but driving circuit is different.In liquid crystal indicator, multiple pixel is arranged in array by row and column.Each pixel comprises thin film transistor (TFT), the pixel capacitance be made up of pixel electrode and public electrode, layer of liquid crystal molecule between pixel electrode and public electrode.The grid of the thin film transistor (TFT) of multiple pixels of going together mutually is connected to same controlling grid scan line jointly, and the source electrode of the thin film transistor (TFT) of multiple pixels of same column is connected to same source electrode data line jointly.
Gate drivers 310 is connected to m bar controlling grid scan line, for providing grid voltage Vg1 to Vgm.Source electrode driver 410 is connected to gamma compensating circuit 430, for latter providing source pole tension Vs1-Vsn.Gamma compensating circuit 430 is connected to n bar source electrode data line, for providing source pole tension Vs1_ctrl-Vsn_ctrl.Compared with the liquid crystal indicator of the prior art shown in Fig. 1, comprise additional gamma compensating circuit 430 according to the liquid crystal indicator of this embodiment.Gamma compensating circuit 430 comprises the gamma resistance of multiple series connection.According to the different stage of luma data, source voltage is provided to n bar source electrode data line by selected gamma resistance, thus can carry out nonlinear compensation according to the image of gamma curve to display.Different from existing gamma compensating circuit, gamma compensating circuit 430 not only carries out Gamma correction, and according to location of pixels and GTG, gamma corrected voltage is revised further, to obtain the source voltage Vs1_ctrl-Vsn_ctrl according to location of pixels and GTG correction.In each frame period of liquid crystal indicator, drive each pixel column line by line, and individual element correction source voltage, thus the difference of the feed-trough voltage of different pixels position can be compensated independently.
In addition, this liquid crystal indicator does not need to compensate common electric voltage in addition, thus allows public electrode ground connection or apply constant common electric voltage, thus can simplify the driving circuit of public electrode and reduce its power consumption.
Fig. 9 illustrates the internal circuit configuration of gamma compensating circuit in liquid crystal indicator according to a fourth embodiment of the invention.Gamma compensating circuit 430 comprises the gamma resistance R1 to R14 of 14 series connection.According to the rank of grayscale signal, gamma compensating circuit 430 selects a corresponding gamma resistance to be connected to source electrode driver 410.Because the resistance value of different gamma resistance is different, obtains the dividing potential drop of different numerical value, therefore can realize Gamma correction.Gamma compensating circuit 430 also comprises three in parallel with each gamma resistance and corrects resistance, realizes being connected in parallel and disconnecting via respective switching tube.Each gamma resistance string in gamma compensating circuit 430 is for correcting a road source voltage.A gamma resistance string for correcting source voltage Vs1 is only shown in the following description.
For gamma resistance R1, first correction resistance R1A is one another in series with the first switching tube Q1A and is connected, then the two ends of gamma resistance R1 are connected in together in parallel, second correction resistance R2A is one another in series with second switch pipe Q2A and is connected, then the two ends of gamma resistance R2 are connected in together in parallel, 3rd correction resistance R3A is one another in series with the 3rd switching tube Q3A and is connected, and is then connected in the two ends of gamma resistance R3 together in parallel.
First to the 3rd clock signal clk A to CLKC controls first respectively to the 3rd switching tube being turned on or off at Q1 to Q3.At each frame period Tf not in the same time, the first to the 3rd switching tube respectively conducting, thus select one of first to the 3rd switching tube to be connected in parallel with gamma resistance R1.First to the 3rd clock signal clk A to CLKC is the clock signal synchronous with the frame period.Such as, in each frame period Tf, the first to the 3rd clock signal clk A to CLKC is in high level in the time period of 0-1/3*Tf, 1/3*Tf-2/3*Tf and 2/3*Tf-Tf respectively, and all the other time periods are in low level.
Due to the frame period is not driving moment of different pixel column in the same time, and therefore, the difference conducting of the first to the 3rd switching tube Q1 to Q3, can regard the correction resistance according to the capable signal behavior different resistance values of sweep trace as.In the example of the above-mentioned first to the 3rd clock signal clk A to CLKC, multiple pixel columns of liquid crystal indicator are divided into three groups, often organize pixel column and adopt a corresponding correction resistance to carry out compensating source electrode voltage.Each correction resistance was both associated with grayscale signal, was associated again with the position of pixel column.Select suitable resistance value, make it possible to the difference compensating the feed-trough voltage that different pixels row and different luma data cause.
Gamma compensating circuit 430, according to location of pixels and GTG, is revised further to gamma corrected voltage, to obtain the source voltage Vs1_ctrl-Vsn_ctrl according to location of pixels and GTG correction.In the circuit shown in Fig. 9, a road gamma resistance string of gamma compensating circuit 430 and correction resistance thereof together, correct source voltage Vs1, to obtain the source voltage Vs1-ctrl of correction.
Figure 10 and 11 illustrates the oscillogram of the driving method of two different pixels positions respectively.Exemplarily, the grid voltage Vg1 of first pixel of the first scanning line driving shown in Figure 10, the source voltage Vs1_ctrl of process correction, the oscillogram of common electric voltage Vcom, the grid voltage Vgm of first pixel of m scanning line driving shown in Figure 11, the source voltage Vsm_ctrl of process correction, the oscillogram of common electric voltage Vcom.The display voltage Vlc applied between two pole plates (being pixel electrode and public electrode respectively) of pixel capacitance is also shown in figures 10 and 11.In desirable driving circuit, the magnitude of voltage of display voltage Vlc after pixel capacitance charges equals the voltage difference between source voltage and common electric voltage.But as mentioned above, due to the existence of gate leakage capacitance Cgd and relevant feed-trough voltage, in fact display voltage Vlc can depart from this voltage difference, thus can not show correct brightness.
In the different pixels position of liquid crystal indicator, feed-trough voltage also exists difference.See Figure 10 and 11, the feed-trough voltage Vft1 of first pixel of the first scanning line driving is less than the feed-trough voltage Vftm of first pixel of m scanning line driving.Driving method of the present invention is according to location of pixels correction source voltage, and the feed-trough voltage that namely superposition is relevant to location of pixels on source voltage, to substitute the driving method compensated common electric voltage.This driving method independently according to the feed-trough voltage compensating source electrode voltage of each pixel, thus can compensate the difference between liquid crystal indicator different pixels.
In the above-described embodiment, the feed-trough voltage oscillation compensation source voltage of the pixel according to diverse location is described.Be appreciated that each pixel can comprise multiple switching tube and multiple pixel capacitance, to realize colored display.Driving method of the present invention is not limited to type and the dot structure thereof of specific liquid crystal indicator.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, do not limit the specific embodiment that this invention is only described yet.Obviously, according to above description, can make many modifications and variations.This instructions is chosen and is specifically described these embodiments, is to explain principle of the present invention and practical application better, thus makes art technician that the present invention and the amendment on basis of the present invention can be utilized well to use.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (10)
1. a liquid crystal indicator, comprising:
Pel array, comprise the multiple pixels by row and column arrangement, each pixel in described multiple pixel comprises thin film transistor (TFT), pixel capacitance and the layer of liquid crystal molecule between the pole plate of pixel capacitance;
Gate driver circuit, is connected with many controlling grid scan lines, and the grid for the thin film transistor (TFT) of the pixel to corresponding line in described multiple pixel provides grid voltage; And
Source electrode drive circuit, is connected with many source electrode data lines, for the source electrode providing source pole tension of the thin film transistor (TFT) of the pixel to respective column in described multiple pixel thus the display voltage between the pole plate arranging described pixel capacitance,
Wherein, described liquid crystal indicator drives each pixel column line by line in each frame period, and according to the feed-trough voltage disparity compensation source voltage of different pixels position.
2. liquid crystal indicator according to claim 1, wherein, the feed-trough voltage disparity compensation source voltage that described liquid crystal indicator is also relevant according to different GTG.
3. liquid crystal indicator according to claim 1, wherein, described source electrode drive circuit according to sweep trace line order number search look-up table, to obtain the compensation rate of the source voltage of pixel, and according to described compensation rate correction source voltage.
4. liquid crystal indicator according to claim 1, wherein, described liquid crystal indicator also comprises source electrode compensating circuit, described source electrode compensating circuit comprises multiple correction resistance of different resistance, described source electrode compensating circuit receives described source voltage from described source electrode drive circuit, according to sweep trace line order number, selected for source voltage correction resistance is provided to the source electrode of the thin film transistor (TFT) of respective pixel.
5. liquid crystal indicator according to claim 1, wherein, described liquid crystal indicator also comprises gamma compensating circuit, described gamma compensating circuit comprises multiple gamma resistance of series connection, described gamma compensating circuit receives described source voltage from described source electrode drive circuit, different gamma resistance is selected, with source voltage according to the feed-trough voltage disparity compensation of different pixels position according to luma data and location of pixels.
6. liquid crystal indicator according to claim 5, wherein, described gamma compensating circuit also comprises at least one and corrects resistance, and in the time period at least partially in each frame period, at least one at least one gamma resistance corrected in resistance and described multiple gamma resistance described is connected in parallel.
7. liquid crystal indicator according to claim 5, wherein, described gamma compensating circuit also comprises multiple correction resistance, according to luma data and location of pixels, from described multiple correction resistance, corresponding at least one gamma resistance corrected in resistance and described multiple gamma resistance is selected to be connected in parallel.
8. a driving method for liquid crystal indicator, described liquid crystal indicator comprises the multiple pixels being arranged in pel array by row and column, and described method comprises:
Each pixel column is driven line by line in each frame period, and according to the feed-trough voltage disparity compensation source voltage of different pixels position.
9. method according to claim 8, wherein, drives the step of each pixel column to comprise:
For each pixel, obtain source voltage according to luma data;
The gamma resistance of different resistance values is selected according to both luma data and location of pixels;
According to luma data and location of pixels, from multiple correction resistance, corresponding correction resistance and described gamma resistance is selected to be connected in parallel; And
Described source voltage is supplied to described pixel by selected gamma resistance,
Wherein, described gamma resistance carries out nonlinear compensation according to the image of gamma curve to display.
10. method according to claim 8, wherein, according to different pixels position by compensating source electrode voltage of tabling look-up.
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