WO2020206789A1 - 液晶显示装置及其驱动方法 - Google Patents

液晶显示装置及其驱动方法 Download PDF

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Publication number
WO2020206789A1
WO2020206789A1 PCT/CN2019/086182 CN2019086182W WO2020206789A1 WO 2020206789 A1 WO2020206789 A1 WO 2020206789A1 CN 2019086182 W CN2019086182 W CN 2019086182W WO 2020206789 A1 WO2020206789 A1 WO 2020206789A1
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Prior art keywords
liquid crystal
crystal display
pixel
display device
voltage
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Ceased
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PCT/CN2019/086182
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English (en)
French (fr)
Inventor
王艳雪
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US16/625,723 priority Critical patent/US20210035523A1/en
Publication of WO2020206789A1 publication Critical patent/WO2020206789A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • 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
    • G09G3/3607—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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G09G2300/0447—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction

Definitions

  • This application relates to the field of display technology, and in particular to a liquid crystal display device and a driving method thereof.
  • the vertical alignment (VA) mode liquid crystal display device has birefringence characteristics of the liquid crystal. Compared with the twisted nematic (TN) mode liquid crystal display device, the VA mode liquid crystal display device is prone to whitening in the display process. (Color washout) problem. At present, the commonly used multi-domain pixel design can improve the skin whitening problem to a certain extent, but in order to enhance the image quality, the viewing angle of the VA mode liquid crystal display device still needs to be improved.
  • the purpose of the present application is to provide a liquid crystal display device and a driving method thereof, so as to solve the problem of viewing angle during display of the liquid crystal display device.
  • a method for driving a liquid crystal display device comprising pixel electrodes and common electrodes;
  • the pixel electrode When the liquid crystal display device displays the Nth frame of image, the pixel electrode outputs a first pixel holding voltage, and the common electrode outputs a common voltage;
  • the pixel electrode When the liquid crystal display device displays the N+1th frame image, the pixel electrode outputs a second pixel holding voltage, and the common electrode outputs the common voltage;
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is not equal to the absolute value of the difference between the second pixel holding voltage and the common voltage, and the first pixel holding voltage and the One of the second pixel retention voltages is greater than the common voltage, and the other is less than the common voltage, and the N is an integer greater than zero.
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is greater than the absolute value of the difference between the second pixel holding voltage and the common voltage.
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is smaller than the absolute value of the difference between the second pixel holding voltage and the common voltage.
  • the first pixel holding voltage and the second pixel holding voltage are both positive.
  • the liquid crystal display device further includes a common voltage generating circuit, a data driving circuit, and a plurality of data lines, and the data driving circuit outputs data to the pixel electrode through the plurality of data lines.
  • a liquid crystal display device the liquid crystal display device includes a pixel electrode and a common electrode, the pixel electrode is used to output a first pixel holding voltage when the liquid crystal display device displays the Nth frame image, and the liquid crystal display device Outputting the second pixel holding voltage when displaying the N+1th frame image; the common electrode is used to output the common voltage when the liquid crystal display device displays the Nth frame image and the N+1th frame image;
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is not equal to the absolute value of the difference between the second pixel holding voltage and the common voltage, and the first pixel holding voltage and the One of the second pixel retention voltages is greater than the common voltage, and the other is less than the common voltage, and the N is an integer greater than zero.
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is greater than the absolute value of the difference between the second pixel holding voltage and the common voltage.
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is smaller than the absolute value of the difference between the second pixel holding voltage and the common voltage.
  • the first pixel holding voltage and the second pixel holding voltage are both positive.
  • the liquid crystal display device further includes a common voltage generating circuit, a data driving circuit, and a plurality of data lines, and the data driving circuit is configured to output data signals to the pixel electrodes through the plurality of data lines. So that the pixel electrode outputs the first pixel holding voltage and the second pixel holding voltage, and the common voltage generating circuit is configured to output a common voltage signal to the common electrode to make the common electrode output the common Voltage.
  • the liquid crystal display device is a vertical alignment mode liquid crystal display device.
  • the present application provides a liquid crystal display device and a driving method thereof.
  • the first pixel holding voltage and the second pixel holding voltage output by the positive and negative half-period pixel electrodes are not symmetrical about the common voltage output by the common electrode, so that the liquid crystal display device displays positive
  • the gray-scale inversion of the negative half-period image is compensated, and the problem of skin whitening in side viewing is improved, thereby solving the problem of viewing angle displayed by the liquid crystal display device.
  • FIG. 1 is a first waveform diagram of the pixel holding voltage and the common voltage output by the pixel electrode and the common electrode of a pixel of a liquid crystal display device of the present application;
  • FIG. 2 is a schematic diagram of liquid crystal deflection when the pixel electrode and common electrode of the liquid crystal display device of the present application output the waveform diagram shown in FIG. 1;
  • FIG. 3 is a waveform diagram of a pixel holding voltage and a common voltage output by a pixel electrode and a common electrode of a pixel of a conventional liquid crystal display device;
  • FIG. 4 is a schematic diagram of liquid crystal deflection when the pixel electrode and common electrode of the liquid crystal display device output the waveform shown in FIG. 3;
  • FIG. 5 is a view angle view when the pixel electrode and the common electrode of the liquid crystal display device output the waveform diagrams shown in FIG. 1 and FIG. 3 to show the skin color of African women;
  • FIG. 6 is a viewing angle view when the pixel electrode and the common electrode of the liquid crystal display device output the waveform diagrams shown in FIG. 1 and FIG. 3 to display white skin color;
  • FIG. 7 is a viewing angle view when the pixel electrode and the common electrode of the liquid crystal display device output the waveform diagrams shown in FIG. 1 and FIG. 3 to show the skin color of Asian women;
  • FIG. 8 is a second waveform diagram of the pixel holding voltage and the common voltage output by the pixel electrode and the common electrode of a pixel of the liquid crystal display device of the present application.
  • the liquid crystal display device is a vertical alignment mode liquid crystal display device.
  • the liquid crystal display device includes an array substrate, a color filter substrate disposed opposite to the array substrate, and a color filter substrate located between the array substrate and the color filter substrate. Liquid crystal, pixel electrodes are arranged on the array substrate, and common electrodes are arranged on the color filter substrate,
  • the pixel electrode When the liquid crystal display device displays the Nth frame of image, the pixel electrode outputs the first pixel holding voltage, and the common electrode outputs the common voltage;
  • the pixel electrode When the liquid crystal display device displays the N+1th frame image, the pixel electrode outputs the second pixel holding voltage, and the common electrode outputs the common voltage;
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is not equal to the absolute value of the difference between the second pixel holding voltage and the common voltage, and one of the first pixel holding voltage and the second pixel holding voltage is greater than the common Voltage, the other is less than the common voltage, N is an integer greater than zero.
  • FIG. 1 is a first waveform diagram of the pixel holding voltage and the common voltage output by the pixel electrode and the common electrode of a pixel of the liquid crystal display device of the application
  • FIG. 2 is the waveform diagram of the liquid crystal display device of the application.
  • a schematic diagram of liquid crystal deflection when the pixel electrode and the common electrode output the waveform shown in FIG. 1. Since the absolute value a1 of the difference between the first pixel holding voltage Va output by the pixel electrode P and the common voltage Vcom when displaying the Nth frame image is not equal to the second pixel holding voltage Vb output by the pixel electrode P when displaying the N+1th frame image The absolute value b1 of the difference from the common voltage Vcom.
  • the absolute value a1 of the difference between the first pixel holding voltage Va and the common voltage Vcom is greater than the absolute value b1 of the difference between the second pixel holding voltage Vb and the common voltage Vcom, the first pixel holding voltage Va and the second pixel holding The voltage Vb is positive polarity, so that the liquid crystal molecules (shown by the solid line) when displaying the Nth frame image and the liquid crystal molecules (shown by the dotted line) when displaying the N+1th frame image are deflected at different angles.
  • the side-viewing liquid crystal display device When the Nth frame image and the N+1th frame image are displayed, the grayscale inversion phenomenon of the Nth frame image and the N+1th frame image is compensated, and the problem of skin whitening is improved, so as to solve the problem of liquid crystal display device display. Perspective issues.
  • Figure 3 is a waveform diagram of the pixel holding voltage and common voltage output by the pixel electrode and common electrode of a pixel of a conventional liquid crystal display device
  • Figure 4 is the output of the pixel electrode and common electrode of the liquid crystal display device.
  • Fig. 3 shows a schematic diagram of liquid crystal deflection in the waveform diagram.
  • the pixel holding voltage (Va and Vb) output by the pixel electrode P is symmetrical with respect to the common voltage (Vcom) output by the common electrode Com, that is
  • the absolute value a of the difference between the pixel holding voltage Va and the common voltage Vcom when displaying the Nth frame image is equal to the absolute value b of the difference between the pixel holding voltage Vb and the common voltage Vcom when displaying the N+1th frame image, so that the display
  • the deflection state of the liquid crystal is the same, and the liquid crystal is a birefringent crystal.
  • the deflection state of the liquid crystal is different when viewed from the front and side, and grayscale brightness reversal is prone to occur.
  • the positive and negative half cycles (the above Nth frame and N+1th frame are a cycle, the Nth frame is a positive half cycle, and the N+1th frame is a negative half cycle.
  • the external appearance of the symmetry state of the pixel holding voltage and the common voltage of the period) is the flicker value of the liquid crystal display device. The smaller the flicker value is, the more symmetrical the pixel holding voltage and the common voltage for the positive and negative half cycles are.
  • Fig. 5 is the output waveform of the pixel electrode and common electrode in the liquid crystal display device as shown in Fig. 1 and the waveform shown in Fig. 3 to show the viewing angle of African female skin color
  • Fig. 6 is the liquid crystal
  • the output of the pixel electrode and the common electrode in the display device is shown in Fig. 1 and the waveform shown in Fig. 3 to show the viewing angle of the white skin color
  • Fig. 7 is the output of the pixel electrode and the common electrode in the liquid crystal display device.
  • the waveform diagram shown and the waveform diagram shown in Figure 3 show the perspective view of Asian women's skin color. Among them, the abscissa of Fig. 5 to Fig.
  • the angle of Fig. 5 to Fig. 7 represents the ratio of the hue (color saturation) at different angles to the hue when the angle is 0, and the angle 0 is the front view.
  • the angle of the liquid crystal display device when the absolute value of the left side view angle (-60 degrees to 0 degrees) and the right side view angle (0 degrees to 60 degrees) are the same, the hue and angle corresponding to the left side view time are The ratio of the hue corresponding to 0 is equal to the ratio of the hue corresponding to the right side view to the hue corresponding to an angle of 0; as the angle increases from 0 degrees to 60 degrees or decreases from 0 degrees to -60 degrees, the value of the ordinate is taken Decrease gradually, indicating that the greater the absolute value of the difference between the side view angle and the front view angle, the more obvious the hue drops.
  • the flicker value of curve c is greater than that of curve d
  • curve c is the curve corresponding to the waveform diagram shown in Figure 1
  • curve d is the curve corresponding to the waveform diagram shown in Figure 3.
  • the curve of curve c The ordinate is greater than that of the curve d, that is, when the side view angle is the same, the hue value corresponding to the curve c is greater than the hue value corresponding to the curve d. It shows that the viewing angle of the pixel electrode and common electrode of the liquid crystal display device when outputting the waveform diagram shown in FIG. 1 is better than the viewing angle when outputting the waveform diagram shown in FIG. 3 when viewed from the side.
  • the driving method of the liquid crystal display device of the present application enables the liquid crystal display device to display positive and negative half-period images by making the first pixel holding voltage and the second pixel holding voltage output by the positive and negative half-period pixel electrodes not symmetrical about the common voltage output by the common electrode.
  • the gray-scale inversion is compensated, and the problem of skin whitening in side view is improved, thereby solving the problem of viewing angle displayed by the liquid crystal display device.
  • FIG. 8 it is a second waveform diagram of the pixel holding voltage and the common voltage output by the pixel electrode and the common electrode of a pixel of the liquid crystal display device of the present application.
  • the waveform diagram shown in FIG. 8 is basically similar to the waveform diagram shown in FIG. 1, except that the absolute value a1 of the difference between the first pixel holding voltage Va and the common voltage Vcom is smaller than the difference between the second pixel holding voltage Vb and the common voltage Vcom.
  • the absolute value of the difference b1 The absolute value of the difference b1.
  • the liquid crystal display device further includes a common voltage generating circuit, a data driving circuit, and a plurality of data lines.
  • the data driving circuit outputs a data signal to the pixel electrode through the plurality of data lines so that the pixel electrode outputs the first pixel holding voltage and the second pixel.
  • the voltage is maintained, and the common voltage generating circuit outputs a common voltage signal to the common electrode so that the common electrode outputs the common voltage.
  • the present application also provides a liquid crystal display device.
  • the liquid crystal display device includes a pixel electrode and a common electrode.
  • the pixel electrode is used to output a first pixel holding voltage when the liquid crystal display device displays an Nth frame image, and displays the N+th Output the second pixel holding voltage when one frame of image;
  • the common electrode is used to output the common voltage when the liquid crystal display device displays the Nth frame of image and the N+1th frame of image;
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is not equal to the absolute value of the difference between the second pixel holding voltage and the common voltage, and one of the first pixel holding voltage and the second pixel holding voltage is greater than the common Voltage, the other is less than the common voltage, N is an integer greater than zero.
  • the absolute value of the difference between the first pixel holding voltage and the common voltage is greater than the absolute value of the difference between the second pixel holding voltage and the common voltage, or the absolute value of the difference between the first pixel holding voltage and the common voltage is less than
  • the second pixel maintains the absolute value of the difference between the voltage and the common voltage. Both the first pixel holding voltage and the second pixel holding voltage are positive.
  • the liquid crystal display device further includes a common voltage generating circuit, a data driving circuit, and a plurality of data lines.
  • the data driving circuit is used to output data signals to the pixel electrode through the plurality of data lines so that the pixel electrode outputs the first pixel holding voltage and the first pixel holding voltage.
  • the two pixels maintain voltage
  • the common voltage generating circuit is used to output a common voltage signal to the common electrode so that the common electrode outputs a common voltage.
  • the liquid crystal display device of the present application makes the first pixel holding voltage and the second pixel holding voltage output by the positive and negative half-period pixel electrodes not symmetrical with respect to the common voltage output by the common electrode, so that the liquid crystal display device displays the gray scale of the positive and negative half-period images.
  • the rotation is compensated, and the problem of skin whitening in side view is improved, thereby solving the problem of viewing angle displayed by the liquid crystal display device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种液晶显示装置及其驱动方法，通过使正负半周期像素电极输出的第一像素保持电压和第二像素保持电压不关于公共电极输出的公共电压对称以使液晶显示装置显示正负半周期图像的灰阶反转得到补偿，侧视时肤色泛白问题得到改善，从而解决液晶显示装置显示的视角问题。

Description

液晶显示装置及其驱动方法 技术领域
本申请涉及显示技术领域，尤其涉及一种液晶显示装置及其驱动方法。
 背景技术
垂直取向（Vertical Alignment，VA）模式液晶显示装置因其液晶具有双折射特性，与扭曲向列（Twisted Nematic，TN）模式液晶显示装置相比，VA 模式液晶显示装置显示过程中易出现肤色泛白（color washout）问题。目前，常用的多畴像素设计可在一定程度上改善肤色泛白问题，但为了增强画质，依旧需要进行VA模式液晶显示装置的视角提升。
因此，有必要提出一种技术方案以解决VA模式液晶显示装置的视角问题。
 技术问题
本申请的目的在于提供一种液晶显示装置及其驱动方法，以解决液晶显示装置显示时存在的视角问题。
 技术解决方案
一种液晶显示装置的驱动方法，所述液晶显示装置包括像素电极以及公共电极；
在所述液晶显示装置显示第N帧图像时，所述像素电极输出第一像素保持电压，所述公共电极输出公共电压；
在所述液晶显示装置显示第N+1帧图像时，所述像素电极输出第二像素保持电压，所述公共电极输出所述公共电压；
其中，所述第一像素保持电压与所述公共电压的差值的绝对值不等于所述第二像素保持电压与所述公共电压的差值的绝对值，所述第一像素保持电压和所述第二像素保持电压中的一者大于所述公共电压，另一者小于所述公共电压，所述N为大于0的整数。
在上述液晶显示装置的驱动方法中，所述第一像素保持电压与所述公共电压的差值的绝对值大于所述第二像素保持电压与所述公共电压的差值的绝对值。
在上述液晶显示装置的驱动方法中，所述第一像素保持电压与所述公共电压的差值的绝对值小于所述第二像素保持电压与所述公共电压的差值的绝对值。
在上述液晶显示装置的驱动方法中，所述第一像素保持电压和所述第二像素保持电压均为正极性。
在上述液晶显示装置的驱动方法中，所述液晶显示装置还包括公共电压生成电路、数据驱动电路以及多条数据线，所述数据驱动电路通过多条所述数据线向所述像素电极输出数据信号以使所述像素电极输出所述第一像素保持电压和所述第二像素保持电压，所述公共电压生成电路向所述公共电极输出公共电压信号以使所述公共电极输出所述公共电压。
一种液晶显示装置，所述液晶显示装置包括像素电极和公共电极，所述像素电极用于在所述液晶显示装置显示第N帧图像时输出第一像素保持电压，并在所述液晶显示装置显示第N+1帧图像时输出第二像素保持电压；所述公共电极用于在所述液晶显示装置显示所述第N帧图像和所述第N+1帧图像时均输出公共电压；
其中，所述第一像素保持电压与所述公共电压的差值的绝对值不等于所述第二像素保持电压与所述公共电压的差值的绝对值，所述第一像素保持电压和所述第二像素保持电压中的一者大于所述公共电压，另一者小于所述公共电压，所述N为大于0的整数。
在上述液晶显示装置中，所述第一像素保持电压与所述公共电压的差值的绝对值大于所述第二像素保持电压与所述公共电压的差值的绝对值。
在上述液晶显示装置中，所述第一像素保持电压与所述公共电压的差值的绝对值小于所述第二像素保持电压与所述公共电压的差值的绝对值。
在上述液晶显示装置中，所述第一像素保持电压和所述第二像素保持电压均为正极性。
在上述液晶显示装置中，所述液晶显示装置还包括公共电压生成电路、数据驱动电路以及多条数据线，所述数据驱动电路用于通过多条所述数据线向所述像素电极输出数据信号以使所述像素电极输出所述第一像素保持电压和所述第二像素保持电压，所述公共电压生成电路用于向所述公共电极输出公共电压信号以使所述公共电极输出所述公共电压。
在上述液晶显示装置中，所述液晶显示装置为垂直取向模式液晶显示装置。
 有益效果
本申请提供一种液晶显示装置及其驱动方法，通过使正负半周期像素电极输出的第一像素保持电压和第二像素保持电压不关于公共电极输出的公共电压对称以使液晶显示装置显示正负半周期图像的灰阶反转得到补偿，侧视时肤色泛白问题得到改善，从而解决液晶显示装置显示的视角问题。
 附图说明
图1为本申请液晶显示装置的一个像素的像素电极和公共电极输出的像素保持电压以及公共电压的第一种波形图；
图2为本申请液晶显示装置的像素电极和公共电极输出图1所示波形图时液晶偏转的示意图；
图3为传统液晶显示装置的一个像素的像素电极和公共电极输出的像素保持电压以及公共电压的波形图；
图4为液晶显示装置的像素电极和公共电极输出图3所示的波形图时液晶偏转的示意图；
图5为液晶显示装置的像素电极和公共电极输出图1和图3所示波形图以显示非洲女性肤色时的视角图；
图6为液晶显示装置的像素电极和公共电极输出图1和图3所示波形图以显示白种人肤色时的视角图；
图7为液晶显示装置的像素电极和公共电极输出图1和图3所示波形图以显示亚洲女性肤色时的视角图；
图8为本申请液晶显示装置的一个像素的像素电极和公共电极输出的像素保持电压以及公共电压的第二种波形图。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请提供一种液晶显示装置的驱动方法，液晶显示装置为垂直取向模式型液晶显示装置，液晶显示装置包括阵列基板、与阵列基板相对设置的彩膜基板以及位于阵列基板和彩膜基板之间的液晶，阵列基板上设置有像素电极，彩膜基板上设置有公共电极，
在液晶显示装置显示第N帧图像时，像素电极输出第一像素保持电压，公共电极输出公共电压；
在液晶显示装置显示第N+1帧图像时，像素电极输出第二像素保持电压，公共电极输出公共电压；
其中，第一像素保持电压与公共电压的差值的绝对值不等于第二像素保持电压与公共电压的差值的绝对值，第一像素保持电压和第二像素保持电压中的一者大于公共电压，另一者小于公共电压，N为大于0的整数。
如图1及图2所示，图1为本申请液晶显示装置的一个像素的像素电极和公共电极输出的像素保持电压以及公共电压的第一种波形图，图2为本申请液晶显示装置的像素电极和公共电极输出图1所示波形图时液晶偏转的示意图。由于显示第N帧图像时像素电极P输出的第一像素保持电压Va与公共电压Vcom的差值的绝对值a1不等于显示第N+1帧图像时像素电极P输出的第二像素保持电压Vb与公共电压Vcom的差值的绝对值b1。具体地，第一像素保持电压Va与公共电压Vcom的差值的绝对值a1大于第二像素保持电压Vb与公共电压Vcom的差值的绝对值b1，第一像素保持电压Va和第二像素保持电压Vb均为正极性，使得显示第N帧图像时的液晶分子（实线所示）与显示第N+1帧图像时的液晶分子（虚线所示）偏转的角度不同，侧视液晶显示装置显示的第N帧图像和第N+1帧图像时，第N帧图像和第N+1帧图像的灰阶反转现象得到补偿，肤色泛白问题得到改善，从而解决液晶显示装置显示时的视角问题。
如图3以及图4所示，图3为传统液晶显示装置的一个像素的像素电极和公共电极输出的像素保持电压以及公共电压的波形图，图4为液晶显示装置的像素电极和公共电极输出图3所示的波形图时液晶偏转的示意图。在传统技术中，液晶显示装置显示第N帧图像时和第N+1帧图像时，像素电极P输出的像素保持电压（Va和Vb）关于公共电极Com输出的公共电压(Vcom)对称，即显示第N帧图像时的像素保持电压Va与公共电压Vcom的差值的绝对值a等于显示第N+1帧图像时的像素保持电压Vb与公共电压Vcom的差值绝对值b，使得显示第N帧图像和第N+1帧图像时，液晶的偏转状态相同，而液晶为双折射晶体，正视和侧视时，液晶的偏转状态不同，易发生灰阶亮度反转。
因实际液晶显示装置的像素保持电压无法通过仪器探得，正负半周期（上述第N帧和第N+1帧为一个周期，第N帧为正半周期，第N+1帧为负半周期）的像素保持电压与公共电压的对称状态的外在表现为液晶显示装置的闪烁（Flicker）值。闪烁值越小，则正负半周期的像素保持电压与公共电压越对称。通过调整输入端伽马（P-gamma ）电压信号与公共电压信号，使用CA-310 色彩分析仪观测闪烁值变化，进而得知像素电极输出的像素保持电压与公共电极输出的公共电压的对称关系。
如图5-图7所示，图5为液晶显示装置中的像素电极和公共电极输出图1所示波形图和图3所示波形图以显示非洲女性肤色时的视角图，图6为液晶显示装置中的像素电极和公共电极输出图1所示波形图和图3所示波形图以显示白种人肤色时的视角图，图7为液晶显示装置中的像素电极和公共电极输出图1所示波形图和图3所示波形图以显示亚洲女性肤色时的视角图。其中，图5-图7的横坐标表示角度(观看角度)，图5-图7的纵坐标表示不同角度时的色相（色彩饱和度）与角度为0时的色相的比值，角度0是正视液晶显示装置时的角度。由图5-图7可知，左侧视的角度（-60度至0度）和右侧视的角度（0度至60度）的绝对值相同时，左侧视时对应的色相与角度为0对应的色相的比值等于右侧视时对应的色相与角度为0对应的色相的比值；随着角度由0度增加至60度或由0度减小至-60度，纵坐标的取值逐渐减小，表明侧视角度与正视时角度的差值的绝对值越大，色相下降得越明显。另外，曲线c的闪烁值大于曲线d的闪烁值，曲线c为对应图1所示波形图的曲线，曲线d为对应图3所示波形图的曲线，侧视的角度相同时，曲线c的纵坐标大于曲线d的纵坐标，即相同侧视角度时，曲线c对应的色相值大于曲线d对应的色相值。表明侧视时，液晶显示装置的像素电极和公共电极输出图1所示波形图时的视角比输出图3所示波形图时的视角好。
本申请液晶显示装置的驱动方法通过使正负半周期像素电极输出的第一像素保持电压和第二像素保持电压不关于公共电极输出的公共电压对称以使液晶显示装置显示正负半周期图像的灰阶反转得到补偿，侧视时的肤色泛白问题得到改善，从而解决液晶显示装置显示的视角问题。
如图8所示，其为本申请液晶显示装置的一个像素的像素电极和公共电极输出的像素保持电压以及公共电压的第二种波形图。图8所示波形图与图1所示波形图基本相似，不同之处在于，第一像素保持电压Va与公共电压Vcom的差值的绝对值a1小于第二像素保持电压Vb与公共电压Vcom的差值的绝对值b1。
进一步地，液晶显示装置还包括公共电压生成电路、数据驱动电路以及多条数据线，数据驱动电路通过多条数据线向像素电极输出数据信号以使像素电极输出第一像素保持电压和第二像素保持电压，公共电压生成电路向公共电极输出公共电压信号以使公共电极输出公共电压。
本申请还提供一种液晶显示装置，液晶显示装置包括像素电极和公共电极，像素电极用于在液晶显示装置显示第N帧图像时输出第一像素保持电压，并在液晶显示装置显示第N+1帧图像时输出第二像素保持电压；公共电极用于在液晶显示装置显示第N帧图像和第N+1帧图像时均输出公共电压；
其中，第一像素保持电压与公共电压的差值的绝对值不等于第二像素保持电压与公共电压的差值的绝对值，第一像素保持电压和第二像素保持电压中的一者大于公共电压，另一者小于公共电压，N为大于0的整数。
进一步地，第一像素保持电压与公共电压的差值的绝对值大于第二像素保持电压与公共电压的差值的绝对值，或，第一像素保持电压与公共电压的差值的绝对值小于第二像素保持电压与公共电压的差值的绝对值。第一像素保持电压和第二像素保持电压均为正极性。
进一步地，液晶显示装置还包括公共电压生成电路、数据驱动电路以及多条数据线，数据驱动电路用于通过多条数据线向像素电极输出数据信号以使像素电极输出第一像素保持电压和第二像素保持电压，公共电压生成电路用于向公共电极输出公共电压信号以使公共电极输出公共电压。
本申请液晶显示装置通过使正负半周期像素电极输出的第一像素保持电压和第二像素保持电压不关于公共电极输出的公共电压对称以使液晶显示装置显示正负半周期图像的灰阶反转得到补偿，侧视时肤色泛白问题得到改善，从而解决液晶显示装置显示的视角问题。
以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (11)

  1. 一种液晶显示装置的驱动方法，其中，所述液晶显示装置包括像素电极以及公共电极；
    在所述液晶显示装置显示第N帧图像时，所述像素电极输出第一像素保持电压，所述公共电极输出公共电压；
    在所述液晶显示装置显示第N+1帧图像时，所述像素电极输出第二像素保持电压，所述公共电极输出所述公共电压；
    其中，所述第一像素保持电压与所述公共电压的差值的绝对值不等于所述第二像素保持电压与所述公共电压的差值的绝对值，所述第一像素保持电压和所述第二像素保持电压中的一者大于所述公共电压，另一者小于所述公共电压，所述N为大于0的整数。
  2. 根据权利要求1所述的液晶显示装置的驱动方法，其中，所述第一像素保持电压与所述公共电压的差值的绝对值大于所述第二像素保持电压与所述公共电压的差值的绝对值。
  3. 根据权利要求1所述的液晶显示装置的驱动方法，其中，所述第一像素保持电压与所述公共电压的差值的绝对值小于所述第二像素保持电压与所述公共电压的差值的绝对值。
  4. 根据权利要求1所述的液晶显示装置的驱动方法，其中，所述第一像素保持电压和所述第二像素保持电压均为正极性。
  5. 根据权利要求1所述的液晶显示装置的驱动方法，其中，所述液晶显示装置还包括公共电压生成电路、数据驱动电路以及多条数据线，所述数据驱动电路通过多条所述数据线向所述像素电极输出数据信号以使所述像素电极输出所述第一像素保持电压和所述第二像素保持电压，所述公共电压生成电路向所述公共电极输出公共电压信号以使所述公共电极输出所述公共电压。
  6. 一种液晶显示装置，其中，所述液晶显示装置包括像素电极和公共电极，所述像素电极用于在所述液晶显示装置显示第N帧图像时输出第一像素保持电压，并在所述液晶显示装置显示第N+1帧图像时输出第二像素保持电压；所述公共电极用于在所述液晶显示装置显示所述第N帧图像和所述第N+1帧图像时均输出公共电压；
    其中，所述第一像素保持电压与所述公共电压的差值的绝对值不等于所述第二像素保持电压与所述公共电压的差值的绝对值，所述第一像素保持电压和所述第二像素保持电压中的一者大于所述公共电压，另一者小于所述公共电压，所述N为大于0的整数。
  7. 根据权利要求6所述的液晶显示装置，其中，所述第一像素保持电压与所述公共电压的差值的绝对值大于所述第二像素保持电压与所述公共电压的差值的绝对值。
  8. 根据权利要求6所述的液晶显示装置，其中，所述第一像素保持电压与所述公共电压的差值的绝对值小于所述第二像素保持电压与所述公共电压的差值的绝对值。
  9. 根据权利要求6所述的液晶显示装置，其中，所述第一像素保持电压和所述第二像素保持电压均为正极性。
  10. 根据权利要求6所述的液晶显示装置，其中，所述液晶显示装置还包括公共电压生成电路、数据驱动电路以及多条数据线，所述数据驱动电路用于通过多条所述数据线向所述像素电极输出数据信号以使所述像素电极输出所述第一像素保持电压和所述第二像素保持电压，所述公共电压生成电路用于向所述公共电极输出公共电压信号以使所述公共电极输出所述公共电压。
  11. 根据权利要求6所述的液晶显示装置，其中，所述液晶显示装置为垂直取向模式液晶显示装置。
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