WO2019242118A1 - 显示装置和驱动方法 - Google Patents

显示装置和驱动方法 Download PDF

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Publication number
WO2019242118A1
WO2019242118A1 PCT/CN2018/105072 CN2018105072W WO2019242118A1 WO 2019242118 A1 WO2019242118 A1 WO 2019242118A1 CN 2018105072 W CN2018105072 W CN 2018105072W WO 2019242118 A1 WO2019242118 A1 WO 2019242118A1
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WO
WIPO (PCT)
Prior art keywords
overvoltage
switch
lookup table
frame picture
driving
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PCT/CN2018/105072
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English (en)
French (fr)
Inventor
黄笑宇
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惠科股份有限公司
重庆惠科金渝光电科技有限公司
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Publication of WO2019242118A1 publication Critical patent/WO2019242118A1/zh

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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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • 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
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present application relates to a driving technology of a display device, and more particularly to a display device with a dual gate structure and a driving method thereof.
  • liquid crystal display LCD
  • ELD electroluminescent display
  • Liquid crystal displays usually provide data signals through a plurality of pixel electrodes according to image information, and control the light transmittance of a plurality of pixel units to display a desired image.
  • each pixel electrode is respectively coupled to a data line and a scanning line, and the scanning line is coupled to the pixel electrode through a TFT (Thin Film Transistor).
  • the TFT is controlled to be turned on by the scanning line, and the pixel electrode is charged by the data line.
  • the driving method of the liquid crystal display generally uses a timing controller to generate various control signals, so that the source driver circuit and the gate driver circuit can drive the pixels on the panel according to this. Display the image.
  • the pixel structure of a liquid crystal display can be mainly divided into a single-gate pixel structure and a dual-gate pixel structure.
  • the number of scan lines of a liquid crystal display using a double-gate pixel structure doubles compared to a liquid crystal display using a single-gate pixel structure, that is, the number of gate driver chips doubles.
  • the number of data lines is halved, that is, the number of source driver chips is halved. Since the gate driver chip has lower cost and power consumption than the source driver chip, the use of a dual-gate pixel structure design can reduce production costs and power consumption. Therefore, a large number of dual-gate pixel architectures are currently used in liquid crystal displays.
  • the double-gate pixel architecture is usually driven with column inversion or row inversion, but this also brings the problem of bright and dark lines at low gray levels.
  • the present application proposes a display device and a driving method thereof, which can solve the problem of low gray-scale bright and dark lines and improve the image quality.
  • the present application proposes a driving method for a display device, which includes the steps of: comparing positive and negative polarity changes between a current frame picture and a next frame picture of a pixel array; judging whether a first overvoltage drive lookup table is applicable or not The second overvoltage-driven lookup table, wherein if there is no polarity switching between the current frame picture and the next frame picture, the first overvoltage drive lookup table applies, and if the current frame picture matches When there is a switch between positive and negative polarity in the next frame, the second overvoltage drive lookup table is applied; a gray scale is determined according to the applicable first overvoltage drive lookup table or the second overvoltage drive lookup table. A voltage difference; and overvoltage driving the pixel array with the grayscale voltage difference.
  • the pixel array has a dual-gate structure.
  • the method further includes a step of comparing a grayscale difference between the current frame picture and the next frame picture.
  • the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than that provided by the first overvoltage drive lookup table.
  • the grayscale voltage difference provided by the second overvoltage drive lookup table is compared to the first overvoltage drive lookup.
  • the gray-scale voltage difference provided in the table is 8 gray-scales on average.
  • the present application also proposes a driving method, which includes the steps of comparing the grayscale difference between the current frame picture of the pixel array and the next frame picture with positive and negative polarity changes; if the current frame picture and the next frame are changed When there is no switching between positive and negative polarity between the pictures, a first grayscale voltage difference corresponding to the grayscale difference is determined according to a first overvoltage drive lookup table; if there is a positive difference between the current frame picture and the next frame picture When the polarity is switched negatively, a second grayscale voltage difference corresponding to the grayscale difference is determined according to a second overvoltage driving lookup table, where the grayscale difference and the second grayscale voltage difference corresponding to the same value are determined. Greater than the first grayscale voltage difference; and overvoltage driving the pixel array with the first grayscale voltage difference or the second grayscale voltage difference.
  • the second grayscale voltage difference is greater than the first grayscale voltage difference by 8 grayscales.
  • the present application also proposes a display device including: a pixel array having a double gate structure, including a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in sequence; And a comparison module for comparing positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array; a judgment module for determining whether a first overvoltage drive lookup table or a second overvoltage drive is applicable A look-up table, wherein if there is no polarity switching between the current frame picture and the next frame picture, the first overvoltage drive lookup table is applied; if the current frame picture and the next frame picture When there is a switch between positive and negative polarity, the second overvoltage drive lookup table is applied; a data line signal module generates a gray according to the applicable first overvoltage drive lookup table or the second overvoltage drive lookup table. Step voltage difference to over-voltage drive the pixel array.
  • the comparison module compares a grayscale difference between the current frame picture and the next frame picture.
  • the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than that provided by the first overvoltage drive lookup table.
  • the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than that provided by the first overvoltage drive lookup table.
  • the gray-scale voltage difference is 8 gray-scales.
  • the comparison module includes a judgment unit, a first switch and a second switch
  • the data line signal module includes an overvoltage driving processing unit
  • the first switch is electrically Is coupled to the determination unit, the overvoltage drive processing unit, and the first overvoltage drive lookup table, and controls whether the overvoltage drive processing unit is allowed to access the first according to the output of the determination unit
  • the second switch is electrically coupled to the judgment unit, the overvoltage drive processing unit, and the second overvoltage drive lookup table, and controls whether to allow according to the output of the judgment unit
  • the overvoltage drive processing unit accesses the second overvoltage drive lookup table
  • the overvoltage drive processing unit accesses the first overvoltage drive lookup table or the second overvoltage drive
  • a look-up table is used to generate the gray-scale voltage difference and perform over-voltage driving on the pixel array.
  • the judging unit when there is no polarity switching between the current frame picture and the next frame picture, the judging unit outputs a first control signal to the first switch and all switches.
  • the control terminal of the second switch turns on the first switch and closes the second switch.
  • the judging unit when there is a polarity switch between the current frame picture and the next frame picture, the judging unit outputs a second control signal to the first switch and all switches.
  • the control terminal of the second switch turns on the second switch and closes the first switch.
  • the first switch is a first-type transistor
  • the second switch is a second-type transistor
  • the first control signal is a low-level signal and the second control signal is It is a high-level signal.
  • the first switch is a first-type transistor
  • the second switch is a second-type transistor
  • the first control signal is a high-level signal and the second control signal is Is a low-level signal.
  • the screen of the display device provided by the present application can maintain uniform brightness and the screen effect can be uniform.
  • the polarity of the charging voltage is changed, different gray-scale voltages are used to accelerate the expected charging target. Therefore, the average response time of the overall display screen can be shortened, further improving the texture of the display screen.
  • FIG. 1 is a schematic diagram of a pixel array having a dual gate structure.
  • FIG. 2 is a timing diagram of a charging voltage signal.
  • FIG. 3 is a schematic diagram of a situation where a bright-dark line occurs in a pixel array of a dual-gate structure.
  • FIG. 4 is a method flowchart of a driving method of the present application.
  • FIG. 5 is a method flowchart of another driving method of the present application.
  • FIG. 6 is a schematic diagram of a component configuration of a display device.
  • FIG. 7 is an overvoltage driving circuit diagram of the present application.
  • FIG. 8 is another overvoltage driving circuit diagram of the present application.
  • FIG. 9 is a waveform diagram of a data signal after overvoltage driving adjustment of the present application.
  • FIG. 1 is a schematic diagram of a pixel array having a dual gate structure.
  • the pixel array 10 is composed of a matrix of a plurality of sub-pixels arranged in an M row x N column. These sub-pixels include a red sub-pixel Rs, a green sub-pixel Gs, and a blue sub-pixel Bs.
  • the distribution arrangement in the pixel array 10 is basically distinguished by rows, that is, the entire pixel array is composed of multiple red sub-pixels.
  • the pixel rows, the plurality of green sub-pixel rows, and the plurality of blue sub-pixel rows are sequentially arranged in turn.
  • the leftmost sub-pixel row of the pixel array 10 is regarded as the first row, labeled as C1, and counted to the right in order.
  • the rightmost sub-pixel row of the pixel array 10 is the Mth row , Marked as CM.
  • the first row of sub-pixels C1 are all composed of red sub-pixels Rs
  • the second row of sub-pixels C2 are composed of green sub-pixels Gs
  • the third row of sub-pixels C3 are composed of blue sub-pixels Bs.
  • the pixel array 10 in FIG. 1 is formed line by line in this order of red, edge color, and blue.
  • the scanning lines are arranged horizontally and are arranged above and below the sub-pixel column, and the signal lines are arranged vertically. To the right and left of the sub-pixel row.
  • Every two rows of sub-pixels are controlled by the same data line.
  • the red sub-pixel of the first row C1 and the green sub-pixel of the second row C2 are controlled by the data line D1; the blue sub-pixel of the third row C3 And the red sub-pixel in the fourth row C4 is controlled by the data line D2; the green sub-pixel in the fifth row C5 and the blue sub-pixel in the sixth row C6 are controlled by the data line D3, and so on.
  • each column of sub-pixels is controlled by two adjacent scanning lines, that is, one scanning line is arranged on the upper and lower sides of a column of sub-pixels, so as to control the sub-pixel columns located between the two scanning lines.
  • the uppermost sub-pixel column of the pixel array 10 is regarded as the first column, labeled as R1, and counted down sequentially, the lowermost sub-pixel column of the pixel array 10, which is the Nth column, is labeled as RN.
  • the upper and lower sides are adjacent to the scanning lines S1 and S2, respectively, and the sub-pixels in the first row of sub-pixels R1 are sequentially connected to the upper scanning line S1 or the lower scanning line S2.
  • the upper and lower sides of the second row of sub-pixels R2 are adjacent to the scanning lines S3 and S4, respectively, and the sub-pixels are sequentially connected to the upper scanning line S3 or the lower scanning line S4 in turn.
  • Vcom represents a common voltage applied to a common electrode
  • Vpixel represents a charging voltage applied to a pixel electrode of a sub-pixel. Since the charging voltage Vpixel is an AC voltage, the polarity changes compared to the common voltage Vcom used as a reference. As shown in the figure, when the charging voltage Vpixel is greater than the common voltage Vcom, it is positive; on the contrary, when the charging voltage Vpixel is less than the common voltage Vcom, it is negative.
  • the charging voltage Vpixel changes in timing, four situations will occur.
  • the polarity of the charging voltage changes from positive polarity to positive polarity, as shown in the rectangular area 21 in the figure; or in the charging process, the polarity of charging voltage changes from negative polarity to negative polarity, as shown in the rectangular area in the figure 22;
  • the polarity of the charging voltage may change from positive to negative, as shown in the rectangular area 23; or the polarity of the charging voltage may change from negative to positive, as shown in the rectangular area twenty four.
  • FIG. 3 shows the bright and dark lines of a pixel array with a dual gate structure.
  • the pixel array 30 is a sub-pixel matrix of 12 rows x 3 columns.
  • the pixel array 30 also has a dual-gate structure, and is composed of a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in turn.
  • the rows and columns are counted from left to right and top to bottom of the pixel array 30, respectively. That is, the leftmost sub-pixel row of the pixel array 30 is regarded as the first row C1 and is counted to the right in order; the uppermost sub-pixel row is regarded as the first column R1 and is counted down in order.
  • the red sub-pixel row includes the first, fourth, seventh, and tenth rows of the pixel array 30 in FIG. 3 and is labeled as C1, C4, C7, and C10, respectively.
  • the green sub-pixel row includes the first and fourth rows of the pixel array 30 in FIG. 3. Lines 2, 5, 8, and 11 are labeled C2, C5, C8, and C11, respectively.
  • the blue sub-pixel lines they include lines 3, 6, 9, and 12 of the pixel array 30 in FIG. For C3, C6, C9, C12.
  • the sub-pixels in the same column are subject to two different scan lines on the upper and lower sides respectively Controlled.
  • the sub-pixels in the first column R1 are controlled by scanning lines S1 and S2, respectively;
  • the sub-pixels in the second column R2 are controlled by scanning lines S3 and S4; the same are in the third column R3
  • the sub-pixels are controlled by the scanning lines S5 and S6, respectively.
  • the gate signals are input one by one from the scanning lines S1 to S6, the charging time of the sub-pixels in the same column will be divided in sequence.
  • the left and right sub-pixels sharing the same data line may be switched in different polarities, respectively. status.
  • the charging voltage of the sub-pixel in the blue sub-pixel row C3 is positive to positive or negative to negative
  • the charging voltage of the sub-pixel in the green sub-picture row C2 is positive. Switching from negative polarity to negative polarity or negative polarity to positive polarity causes the charging of the C2 pixel in the green sub-pixel row is not easy to saturate, and it does not reach the expected brightness and is dark.
  • FIG. 4 is a method flowchart of a driving method of the present application.
  • This driving method can be used in a display device, especially in a display device with a double gate structure.
  • the steps of the driving method are explained below.
  • the positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array are compared (step 11).
  • it is determined whether the first overvoltage driving lookup table (OD table) or the second overvoltage driving lookup table (OD table) is applied according to whether the positive and negative polarities change step 12).
  • the first overvoltage driving lookup table is applied, and if there is a difference between the current frame picture and the next frame picture, When the positive polarity and the negative polarity are switched, the second overvoltage driving lookup table is applied. Then, a gray-scale voltage difference is determined according to the applicable first overvoltage drive lookup table or the second overvoltage drive lookup table (step 13). Subsequently, the pixel array is over-voltage driven by the gray-scale voltage difference (step 14).
  • the pixel array described in step 1 is the same as the pixel array shown in FIG. 1, that is, a pixel array with a dual gate structure.
  • a step may be added before, after, or at the same time as the step 1 is performed: comparing a grayscale difference between the current frame picture and the next frame picture.
  • the grayscale voltage difference provided by the second overvoltage drive lookup table is greater than the grayscale voltage difference provided by the first overvoltage drive lookup table.
  • the grayscale voltage difference provided by the second overvoltage drive lookup table is 8 larger on average than the grayscale voltage difference provided by the first overvoltage drive lookup table.
  • FIG. 5 illustrates a method flowchart of a driving method in another embodiment of the present application.
  • the steps of the driving method are explained below.
  • the grayscale difference between the current frame picture and the next frame picture of the pixel array is compared with the positive and negative polarity changes (step 21). If there is no polarity switching between the current frame picture and the next frame picture, a first grayscale voltage difference corresponding to the grayscale difference is determined according to a first overvoltage drive lookup table (step 22).
  • a second grayscale voltage difference corresponding to the grayscale difference is determined according to a second overvoltage drive lookup table, where the second grayscale voltage difference corresponds to the same
  • the value of the grayscale difference and the second grayscale voltage difference are greater than the first grayscale voltage difference (step 23).
  • the pixel array is over-voltage driven by the first gray-level voltage difference or the second gray-level voltage difference (step 24).
  • the second grayscale voltage difference is on average about 8 grayscales larger than the first grayscale voltage difference.
  • FIG. 6 illustrates a schematic diagram of a component configuration of a display device 6.
  • the display device 6 includes a pixel array 60, a comparison module 61, a determination module 62, and a data line signal module 63.
  • the pixel array 60 has a dual-gate structure.
  • the pixel array 10 shown in FIG. 1 that is, the pixel array 60 is the same as the pixel array 10 shown in FIG. 1. , Including a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in order.
  • the comparison module 61 is configured to compare positive and negative polarity changes between the current frame picture and the next frame picture of the pixel array. In one embodiment, the comparison module 61 compares the grayscale difference between the current frame picture and the next frame picture.
  • the determining module 62 is configured to determine whether the first overvoltage driving lookup table T1 or the second overvoltage driving lookup table T2 is applied. Wherein, if there is no polarity switching between the current frame picture and the next frame picture, the first overvoltage drive lookup table T1 is applied; otherwise, if the current frame picture and the next frame are switched When there is a switching between positive and negative polarity between the screens, the second overvoltage driving lookup table T2 is applied.
  • the grayscale voltage difference provided by the second overvoltage drive lookup table T2 is greater than the grayscale voltage difference provided by the first overvoltage drive lookup table T1.
  • the second grayscale voltage difference is greater than the first grayscale voltage difference by about 8 grayscales.
  • a grayscale voltage difference is generated to overvoltage drive the pixel array.
  • the overvoltage driving circuit 7 includes a picture input unit 71, a controller 72, a memory 73, an overvoltage driving lookup table 74, a timing controller 75, and a pixel array 76.
  • the pixel array 76 has a dual-gate structure.
  • the pixel array 10 shown in FIG. 1 that is, the pixel array 76 is the same as the pixel array 10 shown in FIG. 1. , Including a plurality of red sub-pixel rows, a plurality of green sub-pixel rows, and a plurality of blue sub-pixel rows arranged in order.
  • the picture input unit 71 inputs and transmits picture data to the controller 72 and the over-voltage drive look-up table 74, respectively.
  • the overvoltage drive lookup table 74 includes at least a first overvoltage drive lookup table T1 and a second overvoltage drive lookup table T2.
  • the controller 72 transmits and stores the picture data in the memory 73, and compares the positive and negative polarity changes between the current frame picture and the next frame picture to determine whether the first overvoltage drive lookup table T1 or the second overvoltage drive lookup table is applicable. T2. Subsequently, the timing controller 75 transmits the over-voltage drive-adjusted data signal to the pixel array 76 to perform over-voltage drive on the pixel array.
  • the overvoltage driving circuit 8 mainly includes an overvoltage driving processing unit 80, a judging unit 82, a first overvoltage driving lookup table T1, a second overvoltage driving lookup table T2, a first switch M1, and a second switch M2.
  • the comparison module 61 includes a determination unit 82, a first switch M1 and a second switch M2, and the data line signal module 63 includes an overvoltage driving processing unit 80.
  • the first switch M1 is electrically coupled to the judging unit 82, the overvoltage driving processing unit 80, and the first overvoltage driving lookup table T1, and controls whether the overvoltage driving processing unit 80 is allowed to access the first pass according to the output of the judging unit 82. Press the lookup table T1.
  • the second switch M2 is electrically coupled to the judgment unit 82, the overvoltage drive processing unit 80, and the second overvoltage drive lookup table T2, and controls whether the overvoltage drive processing unit 80 is allowed to access the second Press the lookup table T2.
  • the overvoltage driving processing unit 80 generates a grayscale voltage difference according to the first overvoltage driving lookup table T1 or the second overvoltage driving lookup table T2 that can be accessed, and performs overvoltage driving on the pixel array.
  • the timing controller When the timing controller works, it will record the current frame picture and compare it with the next frame picture. At this time, when the judging unit 82 does not switch between positive and negative polarities between the previous and subsequent frames, it will judge that the first overvoltage drive lookup table T1 is used and output the first control signal to the control terminals of the first switch M1 and the second switch M2. . At this time, the first switch M1 is turned on and the second switch M2 is turned off. Therefore, the overvoltage driving processing unit 80 will read data from the first overvoltage driving lookup table T1 according to the data to be processed, and then output overvoltage driving adjustment. After the data signal.
  • the judging unit 82 judges to use the second overvoltage to drive the lookup table T2, and outputs a second control signal to the control terminals of the first switch M1 and the second switch M2.
  • the second switch M2 is turned on and the first switch M1 is turned off. Therefore, the overvoltage driving processing unit 80 reads data from the second overvoltage driving lookup table T2 according to the data to be processed, and then outputs overvoltage driving adjustment. After the data.
  • the first switch M1 is a P-type transistor
  • the second switch M2 is an N-type transistor.
  • the first control signal is a low-level signal for turning on the first switch M1 and the second switch M2; as for the second control signal, it is a high-level signal for turning on the second switch M2 and Turn off the first switch M1.
  • the first switch M1 may be an N-type transistor
  • the second switch M2 may be a P-type transistor.
  • the first control signal is a high-level signal and the second control signal is a low-level signal. .
  • the increased voltage difference in the second overvoltage drive lookup table T2 is greater than the first overvoltage drive lookup table T2.
  • the grayscale voltage difference in the second overvoltage driving lookup table T2 is 8 grayscales larger than the grayscale voltage difference in the first overvoltage driving lookup table T1.
  • FIG. 9 is a waveform diagram showing a waveform of a data signal after the voltage driving adjustment in the present application.
  • the actual output signal waveform after processing using the first overvoltage driving lookup table T1 is waveform 91 in FIG. 9; the actual output signal after processing using the second overvoltage driving lookup table T2.
  • the waveform is waveform 92 in FIG. 9.
  • the peak voltage of waveform 91 is C1
  • the peak voltage of waveform 92 is higher C2, which shows that the signal voltage processed by using the second overvoltage driving lookup table T2 will be higher than that using the first overvoltage driving lookup table T1.
  • the signal voltage is greater.
  • the voltage difference between the peak voltage C2 of the waveform 92 and the peak voltage C1 of the waveform 91 is the 8 gray levels of the data in the first overvoltage drive lookup table T1 and the second overvoltage drive lookup table T2.
  • the difference is about 0.2 volts. It is worth noting that, at time t, the charging efficiency of the pixel is related to the area of the waveform in FIG. 9, that is, the area of the oblique line area in the figure. The larger the waveform area, the better the charging performance.
  • the area of waveform 92 is larger than the area of waveform 91, that is, the charging efficiency of waveform 92 is higher than the charging efficiency of waveform 91.
  • the situation of the polarity of the charging voltage is considered, and different over-voltage driving look-up tables are used to provide different gray-scale voltage differences. Therefore, the charging efficiency between the parity rows of the pixel array can be effectively balanced, and then the time lost due to the charging voltage switching climbing can be compensated, and the charging effect of the pixels in the parity rows can be the same.
  • the charging voltage is changed from positive polarity to negative polarity or negative polarity to positive polarity, the charging effect can also reach the expected value, and the brightness can reach the expected value without being dimmed, thereby solving the problem of low grayscale bright and dark lines and improving the display device. Picture quality.
  • the gray-scale voltage difference in the look-up table driven by different overvoltages is used to balance the charging efficiency between parity rows to compensate for the time lost due to voltage switching climbing, so that the charging effect is the same, and the positive polarity to negative polarity or From negative polarity to positive polarity, the charging can also reach the expected value, and the brightness reaches the expected value, instead of being dark.
  • the picture quality is improved.
  • the screen of the display device can maintain uniform brightness and the screen effect can be uniform.
  • the polarity of the charging voltage is changed, different gray-scale voltages are used to accelerate the expected charging target. Therefore, the average response time of the overall display screen can be shortened, further improving the texture of the display screen.

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Abstract

一种显示装置（6）及其驱动方法，驱动方法包含下列步骤：首先，比较像素阵列（10、30、60、76）当前帧画面与下一帧画面间的正负极性变化；接着，判断适用第一过压驱动查找表（T1）或是第二过压驱动查找表（T2），其中若当前帧画面与下一帧画面间没有正负极性切换时，适用第一过压驱动查找表（T1），若当前帧画面与下一帧画面间有正负极性切换时，适用第二过压驱动查找表（T2）；根据所适用的第一过压驱动查找表（T1）或是第二过压驱动查找表（T2），决定一灰阶电压差；接着，以灰阶电压差对像素阵列（10、30、60、76）进行过压驱动。

Description

显示装置和驱动方法 技术领域
本申请涉及一种显示装置的驱动技术，尤其涉及一种具有双闸极架构的显示装置及驱动的方法。
背景技术
近年来，随着科技的进步，许多不同的显示设备，例如液晶显示器(Liquid Crystal Display，LCD)或电激发光(Electroluminescent Display，ELD)显示设备已广泛地应用于平面显示器。以液晶显示器为例，液晶显示器大部分为背光型液晶显示器，其是由液晶显示面板及背光模块(backlight module)所组成。液晶显示面板是由两片透明基板以及被封于基板之间的液晶所构成。
液晶显示器，通常是根据图像信息通过多个像素(pixel)电极分别提供数据信号，并且控制多个像素单元的透光率来显示所需图像。具体的是，每一个像素电极都分别耦合数据线和扫描线，扫描线通过TFT(Thin Film Transistor，薄膜晶体管)和像素电极耦合。通过扫描线控制TFT打开，数据线为像素电极充电。
液晶显示器的驱动方式，一般是使用时序控制器(timing controller)来产生各式控制讯号，使得源极驱动电路(source driver)和闸极驱动电路(gate driver)能依此驱动面板上的像素以显示影像。依据驱动模式的不同，液晶显示器的像素结构主要可区分为单闸极(single-gate)像素架构与双闸极(dual-gate)像素架构两种。
在相同的分辨率下，相较于采用单闸型像素结构的液晶显示器，采用双闸型像素结构的液晶显示器的扫描线(scan line)数目会翻倍，即闸极驱动芯片数量翻倍，而数据线(data line)数目则减半，即源极驱动芯片数量减半。由于闸极驱动芯片的成本与耗电量均较源极驱动芯片为低，采用双闸型像素结构设计可降低生产成本及耗电量，因此目前液晶显示器大量采用双闸型像素架构。并且，为了画质，双闸型像素架构通常会搭配列反转或行反转方式来驱 动，但是这样也会带来低灰阶下的亮暗线问题。
发明内容
本申请提出了一种显示装置及其驱动方法，可解决低灰阶亮暗线问题，并且提升画质。
本申请提出一种驱动方法，用于一显示装置中，其中，包含步骤：比较像素阵列当前帧画面与下一帧画面间的正负极性变化；判断适用第一过压驱动查找表或是第二过压驱动查找表，其中若所述当前帧画面与所述下一帧画面间没有正负极性切换时，适用所述第一过压驱动查找表，若所述当前帧画面与所述下一帧画面间有正负极性切换时，适用所述第二过压驱动查找表；根据所适用的第一过压驱动查找表或是第二过压驱动查找表，决定一灰阶电压差；以及以所述灰阶电压差对所述像素阵列进行过压驱动。
在本申请的一实施例中，所述像素阵列具有双闸极架构。
在本申请的一实施例中，更包括一步骤：比较所述当前帧画面与所述下一帧画面间的灰阶差。
在本申请的一实施例中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，大于所述第一过压驱动查找表提供的所述灰阶电压差。
在本申请的一实施例中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，相较于比所述第一过压驱动查找表提供的所述灰阶电压差，平均大8个灰阶。
本申请另外还提出一种驱动方法，其中，包含步骤：比较像素阵列当前帧画面与下一帧画面间的灰阶差与正负极性变化；若所述当前帧画面与所述下一帧画面间没有正负极性切换时，根据第一过压驱动查找表决定对应于所述灰阶差的第一灰阶电压差；若所述当前帧画面与所述下一帧画面间有正负极性切换时，根据第二过压驱动查找表决定对应于所述灰阶差的第二灰阶电压差，其中对应于相同数值的所述灰阶差，所述第二灰阶电压差大于所述第一灰阶电压差；以所述第一灰阶电压差或所述第二灰阶电压差对所述像素阵列进行过压驱动。
在本申请的一实施例中，对应于相同数值的所述灰阶差，所述第二灰阶 电压差大于所述第一灰阶电压差8个灰阶。
本申请并且提出一种显示装置，其中，包含：一像素阵列，具有一双闸极架构，包含有多个红色子像素行、多个绿色子像素行及多个蓝色子像素行依序排列；以及一比较模块，用来比较所述像素阵列当前帧画面与下一帧画面间的正负极性变化；一判断模块，用来判断适用第一过压驱动查找表或是第二过压驱动查找表，其中若所述当前帧画面与所述下一帧画面间没有正负极性切换时，适用所述第一过压驱动查找表，若所述当前帧画面与所述下一帧画面间有正负极性切换时，适用所述第二过压驱动查找表；一数据线信号模块，根据所适用的第一过压驱动查找表或是第二过压驱动查找表，产生一灰阶电压差，对所述像素阵列进行过压驱动。
在本申请的一实施例中，所述比较模块并比较所述当前帧画面与所述下一帧画面间的灰阶差。
在本申请的一实施例中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，大于所述第一过压驱动查找表提供的所述灰阶电压差。
在本申请的一实施例中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，大于所述第一过压驱动查找表提供的所述灰阶电压差8个灰阶。
在本申请的一实施例中，所述比较模块包含一判断单元，一第一开关与一第二开关，且所述数据线信号模块包含一过压驱动处理单元；所述第一开关电性耦接所述判断单元、所述过压驱动处理单元及所述第一过压驱动查找表，并根据所述判断单元的输出而控制是否允许所述过压驱动处理单元存取所述第一过压驱动查找表；所述第二开关电性耦接所述判断单元、所述过压驱动处理单元及所述第二过压驱动查找表，并根据所述判断单元的输出而控制是否允许所述过压驱动处理单元存取所述第二过压驱动查找表；所述过压驱动处理单元根据所能存取的所述第一过压驱动查找表或是所述第二过压驱动查找表，产生所述灰阶电压差，对所述像素阵列进行过压驱动。
在本申请的一实施例中，当所述当前帧画面与所述下一帧画面间没有正负极性切换时，所述判断单元会输出一第一控制讯号至所述第一开关与所述第二开关的控制端以开启所述第一开关并关闭所述第二开关。
在本申请的一实施例中，当所述当前帧画面与所述下一帧画面间有正负极性切换时，所述判断单元会输出一第二控制讯号至所述第一开关与所述第二开关的控制端以开启所述第二开关并关闭所述第一开关。
在本申请的一实施例中，所述第一开关为第一型晶体管，所述第二开关为第二型晶体管，且所述第一控制讯号为低电平讯号，所述第二控制讯号为高电平讯号。
在本申请的一实施例中，所述第一开关为第一型晶体管，所述第二开关为第二型晶体管，且所述第一控制讯号为高电平讯号，所述第二控制讯号为低电平讯号。
由于有效的解决了双闸极架构显示装置画面亮暗线的问题，所以本申请提供的显示装置的画面可维持均匀的亮度，画面效果也会可为均整。此外，由于针对充电电压的极性变化，采用了不同的灰阶电压，来加速达成预期的充电目标，因此，整体显示画面的平均晌应时间将可缩短，进一步提升显示画面的质地。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其他目的、特征和优点能够更明显易懂，以下特举较佳实施例，并配合附图,详细说明如下。
附图说明
所包括的附图用来提供对本申请实施例的进一步的理解，其构成了说明书的一部分，用于例示本申请的实施方式，并与文字描述一起来阐释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。在附图中：
图1是具有双闸极架构(dual gate)的像素阵列示意图。
图2是充电电压讯号时序示意图。
图3是双闸极架构的像素阵列发生亮暗线情形的示意图。
图4是本申请一种驱动方法的方法流程图。
图5是本申请另一种驱动方法的方法流程图。
图6是一种显示装置的组件配置示意图。
图7是本申请一种过压驱动电路图。
图8是本申请另一种过压驱动电路图。
图9是本申请过压驱动调整后的数据信号波形图
具体实施方式
这里所公开的具体结构和功能细节仅仅是代表性的，并且是用于描述本申请的示例性实施例的目的。本申请可以通过许多替换形式来具体实现，并且不应当被解释成仅仅受限于这里所阐述的实施例。
在本申请的描述中，需要理解的是，术语“直向”、“横向”、“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或组件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“配置”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个组件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
这里所使用的术语仅仅是为了描述具体实施例而不意图限制示例性实施例。除非上下文明确地另有所指，否则这里所使用的单数形式“一个”、“一条”还意图包括复数。还应当理解的是，这里所使用的术语“包括”和/或“包含”规定所陈述的特征、整数、步骤、操作、单元和/或组件的存在，而不排除存在或添加一个或更多其他特征、整数、步骤、操作、单元、组件和/或其组合。
图1是具有双闸极架构的像素阵列示意图。如图中所示，此像素阵列10是由多个子像素排列成一个M行x N列的矩阵所构成。这些子像素包括了 红色子像素Rs、绿色子像素Gs及蓝色子像素Bs，并且在像素阵列10中的分布排列方式基本上是以行来区分，亦即整个像素阵列是由多个红色子像素行、多个绿色子像素行及多个蓝色子像素行，依序轮流排列而构成。
以图1为例，把像素阵列10最左侧的子像素行，视为第一行，标示为C1，依序向右计数，则像素阵列10最右侧的子像素行即为第M行，标示为CM。其中，第一行子像素C1皆是由红色子像素Rs构成，第二行子像素C2皆是由绿色子像素Gs构成，第三行子像素C3皆是蓝色子像素Bs构成。按照此种红色、缘色、蓝色的顺序逐行排列，而形成图1中的像素阵列10。
至于扫描线及讯号线与子像素间的配置关系，参照图1，扫描线是以横向延伸的方式，配置于子像素列的上方与下方，至于讯号线则是以直向延伸的方式，配置于子像素行的右侧与左侧。
每两行子像素是由同一数据线所控制，例如：第一行C1的红色子像素与第二行C2的绿色子像素，是由数据线Dl所控制；第三行C3的蓝色子像素及第四行C4的红色子像素，则是由数据线D2所控制；第五行C5的绿色子像素与第六行C6的蓝色子像素，是由数据线D3所控制，并依此类推。
另一方面，每一列子像素则是由相邻两条扫描线所控制，也即在一列子像素的上、下两侧各配置一条扫描线，藉以控制位于此二条扫描线间的子像素列。参照图1，如果把像素阵列10最上方的子像素列视为第一列，标示为R1，依序向下计数，则像素阵列10最下方的子像素列，即为第N列，标示为RN。以第一列子像素R1为例，上下侧分别邻接扫描线S1与S2，而第一列子像素R1中的子像素，则依序轮流连接上方的扫描线S1或是下方的扫描线S2。同样地，第二列子像素R2上下侧分别邻接扫描线S3与S4，其子像素则依序轮流连接上方扫描线S3或是下方的扫描线S4。
请参见图2的充电电压讯号时序示意图，显示了对具有双闸极架构的像素阵列进行充电的情形。其中，Vcom代表施加于共通电极的共通电压，Vpixel则是代表施加于子像素其像素电极的充电电压。由于充电电压Vpixel为交流电压，因此相较于做为基准的共通电压Vcom，会产生极性的变化。如图中所示，当充电电压Vpixel大于共通电压Vcom时，为正极性；反之，当充电电压Vpixel小于共通电压Vcom时，则为负极性。
所以，随着充电电压Vpixel在时序上的变化，会出现四种情形。例如， 在充电程序中，充电电压的极性从正极性到正极性，如图中矩形区21；或是在充电程序中，充电电压的极性从负极性到负极性，如图中矩形区22；此外也可能出现充电电压的极性由正极性转变为负极性的情形，如图中矩形区23；或是充电电压的极性由负极性转变为正极性的情形，如图中矩形区24。
值得注意的是，在上述充电过程中，不论是从正极性到正极性，如图中矩形区21；或是从负极性到负极性，如图中矩形区22，由于无跨压或跨压很小，因此像素充电就会比较饱和，亮度就会是预期的亮度。反之，当充电电压从正极性到负极性，或是由负极性到正极性时，充电时的跨压比较大，而且因为阻容负载(RC loading)的原因，电压切换也需要一段爬坡时间，此时像素充电比较不会饱和，而达不到预期的亮度，导致亮度不足且偏暗。
请参考图3，此图显示双闸极架构的像素阵列的亮暗线情形。由于图3仅为一简约的示意图，因此像素阵列30为一个12行x 3列的子像素矩阵。此像素阵列30亦具备双闸极架构，是由多个红色子像素行、多个绿色子像素行及多个蓝色子像素行依序轮流排列而构成。为了便于理解，此处行与列是分别从像素阵列30的左至右、上至下来计数。亦即像素阵列30的最左侧的子像素行视为第一行C1，依序向右计数；最上侧的子像素列视为第一列R1，依序向下计数。
红色子像素行包括了图3中像素阵列30的第1、4、7、10行，分别标示为C1、C4、C7、C10；绿色子像素行，则包括了图3中像素阵列30的第2、5、8、11行，分别标示为C2、C5、C8、C11；至于，蓝色子像素行，则包括了图3中像素阵列30的第3、6、9、12行，分别标示为C3、C6、C9、C12。
以图3中的绿色子像素行C2与蓝色子像素行C3为例，其共享一条讯号线D2，但是其位于同一列中的子像素，则是分别受到其上下侧两条不同的扫描线所控制。例如，同在第一列R1的子像素，分别被扫描线S1与S2所控制；同在第二列R2的子像素，则分别被扫描线S3与S4所控制；同在第三列R3的子像素，分别被扫描线S5与S6所控制。
因此，当闸极讯号由扫描线S1至S6逐条输入时，同一列子像素开始充电的时间将有先后之分，造成共享同一条数据线的左右两行子像素，可能分别处于不同的极性切换状态。例如，当蓝色子像素行C3中子像素的充电电 压极性变化处于正极性到正极性或是负极性到负极性时，绿色子像行C2中子像素的充电电压极性变化却处于正极性到负极性或是负极性到正极性的切换，导致绿色子像素行C2像素充电不容易饱和，而达不到预期的亮度且偏暗。最终，会产生如图3中所显示的亮暗线问题,其中，奇数行的子像素充电状况较理想，因此呈现亮线；但偶数行的子像素充电未饱和，亮度不足而产生暗线32。特别是，当画面在低灰阶下，这种亮暗线的情况会更加明显。
请参见图4，图4是本申请一种驱动方法的方法流程图。此种驱动方法，可用于一显示装置，特别是可用于具有一双闸极架构的显示装置中。驱动方法的步骤说明如下。首先，比较像素阵列当前帧画面与下一帧画面间的正负极性变化(步骤11)。其次，根据正负极性是否变化，判断适用第一过压驱动查找表(OD Table)或是第二过压驱动查找表(OD Table)(步骤12)。其中，若所述当前帧画面与所述下一帧画面间没有正负极性切换时，适用所述第一过压驱动查找表，若所述当前帧画面与所述下一帧画面间有正负极性切换时，则适用所述第二过压驱动查找表。接着，根据所适用的第一过压驱动查找表或是第二过压驱动查找表，决定一灰阶电压差(步骤13)。随后，以所述灰阶电压差对所述像素阵列进行过压驱动(步骤14)。
在一实施例中，步骤1中所描述的像素阵列，与图1中所显示的像素阵列相同，亦即为具有双闸极架构的像素阵列。
在另一实施例中，可在进行所述步骤1的前后或同时，增加一步骤：比较所述当前帧画面与所述下一帧画面间的灰阶差。
另外，对应于相同数值的灰阶差，所述第二过压驱动查找表提供的灰阶电压差，大于所述第一过压驱动查找表提供的灰阶电压差。在一实施例中，对应于相同数值的灰阶差，第二过压驱动查找表提供的灰阶电压差，相较于第一过压驱动查找表提供的灰阶电压差，平均大8个灰阶左右。
请参见图5，图5显示了本申请在另一种实施例中驱动方法的方法流程图。驱动方法的步骤说明如下。首先，比较像素阵列当前帧画面与下一帧画面间的灰阶差与正负极性变化(步骤21)。若所述当前帧画面与下一帧画面间没有正负极性切换时，根据第一过压驱动查找表决定对应于所述灰阶差的第一灰阶电压差(步骤22)。若所述当前帧画面与所述下一帧画面间有正负极性切换时，根据第二过压驱动查找表决定对应于所述灰阶差的第二灰阶电压 差，其中对应于相同数值的所述灰阶差，所述第二灰阶电压差大于所述第一灰阶电压差(步骤23)。最后，以所述第一灰阶电压差或所述第二灰阶电压差对所述像素阵列进行过压驱动(步骤24)。
在一实施例中，对应于相同数值的所述灰阶差，所述第二灰阶电压差平均会大于所述第一灰阶电压差8个灰阶左右。
请参见图6，图6显示一种显示装置6的组件配置示意图。此显示装置6包含了一像素阵列60、一比较模块61、一判断模块62、以及一数据线信号模块63。其中，像素阵列60具有双闸极架构，其构成组件的详细排列与连接关系，可参见图1中所显示的像素阵列10，亦即，此像素阵列60，相同于图1中的像素阵列10，包含有依序排列的多个红色子像素行、多个绿色子像素行及多个蓝色子像素行。
此外，比较模块61，则用来比较所述像素阵列当前帧画面与下一帧画面间的正负极性变化。在一实施例中，所述比较模块61并会比较所述当前帧画面与所述下一帧画面间的灰阶差。
判断模块62，则用来判断适用第一过压驱动查找表T1或是第二过压驱动查找表T2。其中，若所述当前帧画面与所述下一帧画面间没有正负极性切换时，适用所述第一过压驱动查找表T1；反之，若所述当前帧画面与所述下一帧画面间有正负极性切换时，适用所述第二过压驱动查找表T2。在一实施例中，对应于相同数值的灰阶差，第二过压驱动查找表T2提供的灰阶电压差，大于第一过压驱动查找表T1提供的灰阶电压差。在一实施例中，对应于相同数值的灰阶差，第二灰阶电压差大于第一灰阶电压差8个灰阶左右。
至于，数据线信号模块63，则可根据所适用的第一过压驱动查找表T1或是第二过压驱动查找表T2，产生一灰阶电压差，对所述像素阵列进行过压驱动。
请参见图7，图7显示本申请一种过压驱动电路图。此过压驱动电路7包含了一画面输入单元71、一控制器72、一存储器73、一过压驱动查找表74、一时序控制器75以及一像素阵列76。其中，像素阵列76具有双闸极架构，其构成组件的详细排列与连接关系，可参见图1中所显示的像素阵列10，亦即，此像素阵列76，相同于图1中的像素阵列10，包含有依序排列的多 个红色子像素行、多个绿色子像素行及多个蓝色子像素行。
画面输入单元71将画面数据输入并分别传送至控制器72与过压驱动查找表74。过压驱动查找表74至少包括了第一过压驱动查找表T1与第二过压驱动查找表T2。控制器72将画面数据传送并储存于存储器73，并比较当前帧画面与下一帧画面间的正负极性变化，判断适用第一过压驱动查找表T1或是第二过压驱动查找表T2。随后，时序控制器75会将过压驱动调整后的数据信号，传送至像素阵列76，对所述像素阵列进行过压驱动。
请参见图8，图8显示本申请另一种过压驱动电路图。此过压驱动电路8主要包含了一过压驱动处理单元80、一判断单元82、第一过压驱动查找表T1、第二过压驱动查找表T2、第一开关M1、第二开关M2。与图6相比对，比较模块61包含了判断单元82，第一开关M1与第二开关M2，且数据线信号模块63包含了过压驱动处理单元80。第一开关M1电性耦接判断单元82、过压驱动处理单元80及第一过压驱动查找表T1，并根据判断单元82的输出而控制是否允许过压驱动处理单元80存取第一过压驱动查找表T1。第二开关M2电性耦接判断单元82、过压驱动处理单元80及第二过压驱动查找表T2，并根据判断单元82的输出而控制是否允许过压驱动处理单元80存取第二过压驱动查找表T2。过压驱动处理单元80根据所能存取的第一过压驱动查找表T1或是第二过压驱动查找表T2，产生灰阶电压差，对像素阵列进行过压驱动。
当时序控制器工作时，会记录当前帧画面，并与下一帧画面进行比较。此时，判断单元82在前后帧画面间没有正负极性切换时，会判断使用第一过压驱动查找表T1，而输出第一控制讯号至第一开关M1与第二开关M2的控制端。此时，第一开关M1开启，第二开关M2关闭，因此，过压驱动处理单元80会根据待处理的数据，从第一过压驱动查找表T1中读取数据，再输出过压驱动调整后的数据信号。
反之，在前后帧画面间有正负极性切换时，判断单元82则判断使用第二过压驱动查找表T2，而输出第二控制讯号至第一开关M1与第二开关M2的控制端。此时，第二开关M2开启，第一开关M1关闭，因此，过压驱动处理单元80会根据待处理的数据，从第二过压驱动查找表T2中读取数据，再输出过压驱动调整后的数据。
在一实施例中，如图8所示，所述第一开关M1为一P型晶体管，所述第二开关M2为一N型晶体管。此时，第一控制讯号为一低电平讯号，用以开启第一开关M1且关闭第二开关M2；至于，第二控制讯号则为一高电平讯号，用以开启第二开关M2且关闭第一开关M1。在另一实施例中，第一开关M1可以为N型晶体管，第二开关M2可以为P型晶体管，此时第一控制讯号为高电平讯号，而第二控制讯号则为低电平讯号。
第二过压驱动查找表T2与第一过压驱动查找表T1中的数据相比，针对相同的灰阶差，第二过压驱动查找表T2中增大的电压差，要大于第一过压驱动查找表T1中的电压差。亦即，采用第二过压驱动查找表T2时，液晶分子偏转至目标角度的速度更快。在一实施例中第二过压驱动查找表T2中的灰阶电压差要比第一过压驱动查找表T1中的灰阶电压差大8个灰阶。
请参见图9，图9为一波形图，显示本申请中经过压驱动调整后的数据信号波形。以同样的待处理数据为例，利用第一过压驱动查找表T1处理后，实际的输出信号波形为图9中的波形91；利用第二过压驱动查找表T2处理后，实际的输出信号波形则为图9中波形92。其中，波形91的峰值电压为C1，波形92的峰值电压则为更高的C2，显示了利用第二过压驱动查找表T2处理后的信号电压，会比利用第一过压驱动查找表T1的信号电压更大。
在一实施例中，波形92的峰值电压C2与波形91的峰值电压C1的电压差，即为第一过压驱动查找表T1与第二过压驱动查找表T2中数据的8个灰阶的差异，大约为0.2伏特。值得注意的是，在时间t中，像素的充电效率与图9中波形的面积有关，即图中的斜线区域面积。波形面积越大，充电效能越好。因为，波形92的峰值电压C2大于波形91的峰值电压C1，所以波形92的面积大于波形91的面积，亦即波形92的充电效率要高于波形91的充电效率。
在上述的驱动方法与显示装置中，考虑了充电电压其极性变化的情形，而采用了不同的过压驱动查找表，来提供不同的灰阶电压差。因此，可有效的平衡像素阵列其奇偶行之间的充电效率，进而补偿因充电电压切换爬坡损失掉的时间，并使奇偶行像素的充电效果达到一样。使充电电压由正极性到负极性或负极性到正极性时，其充电效果也能达到预期，亮度达到预期值，而不会偏暗，从而解决低灰阶亮暗线问题，并提升显示装置的画面品质。
由于利用不同的过压驱动查找表中的灰阶电压差，平衡奇偶行间的充电效率，来补偿因电压切换爬坡损失掉的时间，从而使充电效果达到一样，使正极性到负极性或负极性到正极性时，充电也能达到预期，亮度达到预期值，而不是偏暗。从而解决低灰阶亮暗线问题，提升画面品质。再者，由于有效的解决了双闸极架构显示装置画面亮暗线的问题，所以显示装置的画面可维持均匀的亮度，画面效果也会可为均整。此外，由于针对充电电压的极性变化，采用了不同的灰阶电压，来加速达成预期的充电目标，因此，整体显示画面的平均晌应时间将可缩短，进一步提升显示画面的质地。
以上所述，仅是本申请的较佳实施例而已，并非对本申请作任何形式上的限制，虽然本申请已以较佳实施例揭露如上，然而并非用以限定本申请,任何熟悉本专业的技术人员,在不脱离本申请技术方案范围内，当可利用上述揭示的方法及技术内容作出些许的更动或修饰为等同变化的等效实施例，但凡是未脱离本申请技术方案的内容，依据本申请的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本申请技术方案的范围内。

Claims (20)

  1. 一种显示装置的驱动方法，包含步骤：
    比较像素阵列当前帧画面与下一帧画面间的正负极性变化；
    判断适用第一过压驱动查找表或是第二过压驱动查找表，其中若所述当前帧画面与所述下一帧画面间没有正负极性切换时，适用所述第一过压驱动查找表，若所述当前帧画面与所述下一帧画面间有正负极性切换时，适用所述第二过压驱动查找表；
    根据所适用的第一过压驱动查找表或是第二过压驱动查找表，决定一灰阶电压差；以及
    以所述灰阶电压差对所述像素阵列进行过压驱动。
  2. 如权利要求1所述的驱动方法，其中，更包括一步骤：比较所述当前帧画面与所述下一帧画面间的灰阶差。
  3. 如权利要求2所述的驱动方法，其中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，大于所述第一过压驱动查找表提供的所述灰阶电压差。
  4. 如权利要求2所述的驱动方法，其中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，相较于比所述第一过压驱动查找表提供的所述灰阶电压差，平均大8个灰阶。
  5. 一种驱动方法，包含步骤：
    比较像素阵列当前帧画面与下一帧画面间的灰阶差与正负极性变化；
    若所述当前帧画面与所述下一帧画面间没有正负极性切换时，根据第一过压驱动查找表决定对应于所述灰阶差的第一灰阶电压差；
    若所述当前帧画面与所述下一帧画面间有正负极性切换时，根据第二过压驱动查找表决定对应于所述灰阶差的第二灰阶电压差，其中对应于相同数值的所述灰阶差，所述第二灰阶电压差大于所述第一灰阶电压差；
    以所述第一灰阶电压差或所述第二灰阶电压差对所述像素阵列进行过压驱动。
  6. 如权利要求5所述的驱动方法，其中，更包括一步骤：比较所述当前帧画面与所述下一帧画面间的灰阶差
  7. 如权利要求5所述的驱动方法，其中，对应于相同数值的所述灰阶差， 所述第二灰阶电压差大于所述第一灰阶电压差8个灰阶。
  8. 一种显示装置，包含：
    一像素阵列，具有一双闸极架构，包含有多个红色子像素行、多个绿色子像素行及多个蓝色子像素行依序排列；
    一比较模块，用来比较所述像素阵列当前帧画面与下一帧画面间的正负极性变化；
    一判断模块，用来判断适用第一过压驱动查找表或是第二过压驱动查找表，其中若所述当前帧画面与所述下一帧画面间没有正负极性切换时，适用所述第一过压驱动查找表，若所述当前帧画面与所述下一帧画面间有正负极性切换时，适用所述第二过压驱动查找表；
    一数据线信号模块，根据所适用的第一过压驱动查找表或是第二过压驱动查找表，产生一灰阶电压差，对所述像素阵列进行过压驱动。
  9. 如权利要求8所述的显示装置，其中，所述比较模块，用于比较所述当前帧画面与所述下一帧画面间的灰阶差。
  10. 如权利要求9所述的显示装置，其中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，大于所述第一过压驱动查找表提供的所述灰阶电压差。
  11. 如权利要求10所述的显示装置，其中，对应于相同数值的所述灰阶差，所述第二过压驱动查找表提供的所述灰阶电压差，大于所述第一过压驱动查找表提供的所述灰阶电压差8个灰阶。
  12. 如权利要求10所述的显示装置，其中，所述比较模块包含一判断单元，一第一开关与一第二开关，且所述数据线信号模块包含一过压驱动处理单元；所述第一开关电性耦接所述判断单元、所述过压驱动处理单元及所述第一过压驱动查找表，并根据所述判断单元的输出而控制是否允许所述过压驱动处理单元存取所述第一过压驱动查找表；所述第二开关电性耦接所述判断单元、所述过压驱动处理单元及所述第二过压驱动查找表，并根据所述判断单元的输出而控制是否允许所述过压驱动处理单元存取所述第二过压驱动查找表；所述过压驱动处理单元根据所能存取的所述第一过压驱动查找表或是所述第二过压驱动查找表，产生所述灰阶电压差，对所述像素阵列进行过压驱动。
  13. 如权利要求12所述的显示装置，其中，当所述当前帧画面与所述下一帧画面间没有正负极性切换时，所述判断单元会输出一第一控制讯号至所述第一开关与所述第二开关的控制端以开启所述第一开关并关闭所述第二开关。
  14. 如权利要求13所述的显示装置，其中，当所述当前帧画面与所述下一帧画面间有正负极性切换时，所述判断单元会输出一第二控制讯号至所述第一开关与所述第二开关的控制端以开启所述第二开关并关闭所述第一开关。
  15. 如权利要求14所述的显示装置，其中，所述第一开关为第一型晶体管，所述第二开关为第二型晶体管，且所述第一控制讯号为低电平讯号，所述第二控制讯号为高电平讯号。
  16. 如权利要求14所述的显示装置，其中，所述第一开关为第一型晶体管，所述第二开关为第二型晶体管，且所述第一控制讯号为高电平讯号，所述第二控制讯号为低电平讯号。
  17. 如权利要求8所述的显示装置，其中，所述比较模块包含一判断单元，一第一开关与一第二开关，且所述数据线信号模块包含一过压驱动处理单元；所述第一开关电性耦接所述判断单元、所述过压驱动处理单元及所述第一过压驱动查找表，并根据所述判断单元的输出而控制是否允许所述过压驱动处理单元存取所述第一过压驱动查找表；所述第二开关电性耦接所述判断单元、所述过压驱动处理单元及所述第二过压驱动查找表，并根据所述判断单元的输出而控制是否允许所述过压驱动处理单元存取所述第二过压驱动查找表；所述过压驱动处理单元根据所能存取的所述第一过压驱动查找表或是所述第二过压驱动查找表，产生所述灰阶电压差，对所述像素阵列进行过压驱动。
  18. 如权利要求17所述的显示装置，其中，当所述当前帧画面与所述下一帧画面间没有正负极性切换时，所述判断单元会输出一第一控制讯号至所述第一开关与所述第二开关的控制端以开启所述第一开关并关闭所述第二开关；当所述当前帧画面与所述下一帧画面间有正负极性切换时，所述判断单元会输出一第二控制讯号至所述第一开关与所述第二开关的控制端以开启所述第二开关并关闭所述第一开关。
  19. 如权利要求18所述的显示装置，其中，所述第一开关为第一型晶体管，所述第二开关为第二型晶体管，且所述第一控制讯号为低电平讯号，所述第二控制讯号为高电平讯号。
  20. 如权利要求18所述的显示装置，其中，所述第一开关为第一型晶体管，所述第二开关为第二型晶体管，且所述第一控制讯号为高电平讯号，所述第二控制讯号为低电平讯号。
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