WO2020056885A1 - 显示装置及其驱动方法 - Google Patents

显示装置及其驱动方法 Download PDF

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Publication number
WO2020056885A1
WO2020056885A1 PCT/CN2018/114468 CN2018114468W WO2020056885A1 WO 2020056885 A1 WO2020056885 A1 WO 2020056885A1 CN 2018114468 W CN2018114468 W CN 2018114468W WO 2020056885 A1 WO2020056885 A1 WO 2020056885A1
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Prior art keywords
driving voltage
backlight
sub
signal
pixel
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PCT/CN2018/114468
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English (en)
French (fr)
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康志聪
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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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Priority to US17/041,690 priority Critical patent/US11355075B2/en
Publication of WO2020056885A1 publication Critical patent/WO2020056885A1/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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • 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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • 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
    • G09G3/2003—Display 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
    • 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
    • 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
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/14—Solving problems related to the presentation of information to be displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present application relates to a display, in particular to a display device, and also to a driving method of a display device.
  • VA liquid crystal display is a common liquid crystal display.
  • VA liquid crystal display in the large viewing angle, the brightness quickly saturates with the driving voltage, resulting in serious color shift, and then affect the image quality.
  • An improved solution is to display each frame of image through two sub-frames before and after (for example, a 60Hz image is displayed by two 120Hz sub-frames in front and back), and the pixel driving voltage of one sub-frame is high, and the other The pixel driving voltage of one subframe is a low voltage.
  • a display device and a driving method thereof are provided.
  • a driving method for a display device includes: dividing a backlight of the display device into a plurality of regions, and pixels of the display device are divided into blocks corresponding to the areas of the backlight source one by one; the backlight source includes a plurality of colors.
  • Light source independently controlling the brightness of each color light source of each said area through the partition control unit; obtaining the input signal of each frame image to be displayed; displaying each frame image through two sub-frames before and after, and one sub-frame
  • the driving voltage of a pixel of a frame is greater than the driving voltage of the same pixel in another sub-frame; according to the driving voltage of the pixel corresponding to each said region, it is determined that each color light source of each said region corresponds to the backlight of two sub-frames respectively
  • the magnitude of the brightness compensation signal wherein the higher the driving voltage is, the smaller the backlight brightness compensation signal is, and the lower the driving voltage is, the larger the backlight brightness compensation signal is, so as to alleviate the brightness difference of the same pixel in two subframes; and
  • the backlight brightness compensation signal adjusts the light output brightness of each color light source in each area.
  • a driving method for a display device includes: dividing a red, green, and blue three-color backlight source of the display device into a plurality of regions, and pixels of the display device are divided into blocks corresponding to the regions of the backlight source one-to-one; Independently control the light intensity of each color light source in each of the areas; obtain the input signal of each frame of image to be displayed; obtain the reference backlight brightness signal corresponding to each frame of image; Display in a frame, and the driving voltage of a pixel in one sub-frame is greater than the driving voltage of the same pixel in another sub-frame; the maximum signal and the minimum signal of each color sub-pixel in each said block in the input signal of each frame image are counted The driving voltage of the maximum signal of each color sub-pixel, wherein the driving voltage of one sub-frame is recorded as the first driving voltage and the driving voltage of the other sub-frame is recorded as the second driving voltage; The driving voltage of the minimum signal of the color sub-pixel, where the driving voltage of one sub-frame is recorded as the third driving voltage
  • R TH ⁇ L + R TL ⁇ L R TH ⁇ L RL + R TL ⁇ L RH ;
  • R ′ TH ⁇ L + R ′ TL ⁇ L R ′ TH ⁇ L RL + R ′ TL ⁇ L RH ;
  • L RL is the smaller one of the red sub-pixel backlight luminance compensation signals in the two sub-frames of each frame of image
  • L RH is the larger one
  • R TH is the first driving voltage of the red sub-pixel
  • R TL is The second driving voltage
  • R ′ TH is the third driving voltage
  • R ′ TL is the fourth driving voltage
  • L is the reference backlight bright signal
  • G TH ⁇ L + G TL ⁇ L G TH ⁇ L GL + G TL ⁇ L GH ;
  • G ′ TH ⁇ L + G ′ TL ⁇ L G ′ TH ⁇ L GL + G ′ TL ⁇ L GH ;
  • L GL is the smaller one of the green sub-pixel backlight luminance compensation signals in the two sub-frames of each image
  • L GH is the larger one
  • G TH is the first driving voltage
  • G TL is the second Driving voltage
  • G ′ TH is the third driving voltage
  • G ′ TL is the fourth driving voltage
  • B TH ⁇ L + B TL ⁇ L B TH ⁇ L BL + B TL ⁇ L BH ;
  • L BL is the smaller one of the blue sub-pixel backlight luminance compensation signals in the two sub-frames of each image
  • L BH is the larger one
  • B TH is the first driving voltage
  • B TL is the first Two driving voltages
  • B ′ TH is the third driving voltage
  • B ′ TL is the fourth driving voltage
  • the brightness of each light source of each color is adjusted according to the backlight brightness compensation signal of each color light source.
  • a display device includes: a display panel; a backlight module including a backlight source and a partition control unit, the backlight source includes a plurality of colors of light sources, and the partition control unit is configured to divide the backlight source into multiple regions And independently control the light output brightness of each light source in each area, the pixels in the display panel are divided into blocks that correspond one-to-one to the area of the backlight module; and the driving circuit includes: an input module for obtaining the display required Input signal of each frame of image; high and low voltage frame display module, which is used to display each frame of image through two sub-frames before and after, and the driving voltage of pixels in one sub-frame is greater than the driving voltage of the same pixel in another sub-frame;
  • the backlight compensation determining module is configured to determine the magnitude of the backlight brightness compensation signal corresponding to two sub-frames of each color light source in each of the regions according to the driving voltage of the pixels corresponding to each of the regions; the higher the driving voltage is, the The smaller the backlight brightness compensation signal and the lower
  • the above display device and its driving method display each frame of image through two sub-frames before and after, the driving voltage of the same pixel in the two sub-frames is high and low, and the backlight brightness of the two sub-frames is dark and bright, so as to relieve the two sub-frames
  • the brightness difference of the same pixel in the frame reduces the flicker caused by the driving voltage fluctuations of the two sub-frames.
  • the partition control unit divides the backlight module into multiple areas that can independently control the brightness of the light. Accordingly, pixels of different blocks on the display panel can be individually compensated for backlight brightness. Compared with a backlight module that uses a uniform backlight brightness, it has better Anti-flicker effect.
  • the pixels of the liquid crystal display do not need to be further divided into primary and secondary sub-pixels, which can greatly reduce the process complexity of the display panel, and greatly improve the transmittance and analysis of the liquid crystal display panel Degree, reducing the cost of backlight design.
  • FIG. 1 is a flowchart of a driving method of a display device according to an embodiment
  • FIG. 2 is a schematic diagram of a backlight module of a liquid crystal display suitable for a driving method of a display device according to an embodiment
  • step S130 is a flowchart of sub-steps of step S130 in an embodiment
  • FIG. 4 is a schematic diagram of performing a spatial low-pass smoothing filtering process on a backlight compensation value in an embodiment
  • FIG. 5 is a block diagram of a display device in an embodiment.
  • the display device to which the display device driving method of the present application is applicable may be a liquid crystal display such as TN (Twisted Nematic), VA (Vertical Alignment), OCB (Optically Compensated Curved Alignment), but is not limited thereto.
  • the backlight of the liquid crystal display can use direct or side backlight, and the backlight source is a RGB three-color backlight source.
  • This driving method is also applicable to the case where the liquid crystal display is a curved screen, and the RGBW backlight source and the RGBY backlight source.
  • FIG. 2 is a schematic diagram of a backlight module of a display device suitable for a driving method of a display device according to an embodiment.
  • the backlight module 100 includes a backlight source and a partition control unit, and the light of the backlight source controls the backlight module 100 under the control of the partition control unit.
  • FIG. 1 is a flowchart of a driving method of a display device according to an embodiment, including the following steps:
  • the liquid crystal display obtains an input signal of each frame image to be displayed from an external device, such as a graphics processing unit (GPU).
  • the liquid crystal display also obtains a reference backlight brightness according to the input signal (for controlling the light output brightness of the backlight source, which can be represented by a reference backlight brightness signal), and the brightness is the backlight brightness of the backlight source without backlight compensation.
  • S120 Display each frame of image through two sub-frames before and after, and the driving voltage of the pixels of one sub-frame is greater than that of the other sub-frame.
  • Each frame of image is displayed through two sub-frames before and after, that is, one frame of image is divided into two frames in time sequence, which are recorded as the first sub-frame and the second sub-frame, respectively.
  • the compensation displays an image corresponding to the input signal to the user.
  • the driving voltage of each pixel on the first sub-frame is greater than the driving voltage of the corresponding sub-pixel on the second sub-frame. That is, the first subframe is driven with a high driving voltage, and the second subframe is driven with a lower driving voltage that is lower than the first subframe.
  • the driving voltage of each sub-pixel of the first sub-frame and the second sub-frame can be obtained by using a lookup table (LUT, Look Up Table).
  • the look-up table is stored in a frame buffer in the liquid crystal display in advance.
  • the lookup table is a correspondence table between the voltage of the input signal and the driving voltage of each sub-pixel of the first subframe and the second subframe corresponding to the input signal.
  • the color gray value of each R / G / B input signal 0 to 255 corresponds to 256 pairs of high and low voltage signals, and a total of 3 * 256 pairs of high voltage signals R TH / G TH / B TH With low voltage signal R TL / G TL / B TL .
  • the corresponding high driving voltage and the corresponding low driving voltage can be found, so that the high driving voltage is used as the driving voltage of the sub-pixel in the first sub-frame, and The low driving voltage is used as the driving voltage of the sub-pixel in the second sub-frame.
  • the size of the backlight brightness compensation signal of each color light source in each area of the backlight module is determined according to the driving voltage of the pixels of the corresponding block. The higher the driving voltage, the smaller the backlight brightness compensation signal and the driving voltage. The lower the value, the larger the backlight brightness compensation signal.
  • the backlight brightness compensation signal is different in size. The first sub-frame with high driving voltage is compensated by a darker backlight compensation signal, and the second sub-frame with low driving voltage. The frame is compensated by a brighter backlight brightness compensation signal to alleviate the difference in brightness of the same pixel in the two sub-frames of each frame of image.
  • the backlight module in this embodiment includes a plurality of areas that can independently control the brightness of the light. Accordingly, pixels of different blocks on the display panel can be individually compensated for backlight brightness, which is better than a backlight module that uses a uniform backlight brightness. Anti-flicker effect.
  • S140 Adjust the light output brightness of each color light source in each area according to the backlight brightness compensation signal.
  • the light output brightness of the backlight module is correspondingly a low brightness and a high brightness, which respectively compensate the first sub-frame.
  • Frame and second subframe Since the light output brightness of each color light source in each area of the backlight module is independently controlled, the driving voltage of the pixels in each block of the display panel is different, so the backlight brightness compensation signal and even the light output brightness of each area will also be different. .
  • the backlight brightness compensation mechanism when the driving voltage difference between the first sub-frame and the second sub-frame is less than a preset backlight brightness compensation threshold, the backlight brightness compensation mechanism is not activated, and the backlight module directly uses the reference backlight brightness for light emission control. In another embodiment, when the difference between the backlight brightness compensation signals of the two sub-frames is less than a preset backlight brightness compensation threshold, the backlight brightness compensation mechanism is not activated.
  • each frame of image is displayed through two sub-frames before and after.
  • the driving voltage of the same pixel in the two sub-frames is high and low, and the backlight brightness of the two sub-frames is dark and bright.
  • the brightness difference of the same pixel in the image reduces the flicker phenomenon caused by the driving voltage fluctuation of the two sub-frames.
  • the partition control unit divides the backlight module into a plurality of areas that can independently control the brightness of the light. Accordingly, pixels of different blocks on the display panel can be individually compensated for backlight brightness, which is better than a backlight module that uses a uniform backlight brightness. Anti-flicker effect.
  • the pixels of the liquid crystal display do not need to be further divided into primary and secondary sub-pixels, which can greatly reduce the process complexity of the display panel, and greatly improve the transmittance and resolution of the liquid crystal display panel. Degree, reducing the cost of backlight design.
  • step S140 is to perform backlight brightness compensation on the next frame image, so that the backlight brightness of the subframe with the higher driving voltage in the two subframes of the next frame image is smaller than the reference backlight brightness and the backlight of the other subframe. Brightness is greater than the reference backlight brightness. That is, the backlight brightness of the currently displayed frame image is calculated based on the previous frame image. Since the two adjacent frames are generally the same, it is reasonable to compensate the backlight brightness based on the previous frame.
  • step S130 is specifically implemented in the following manner:
  • step S310 is further divided into a step S312 for counting the maximum signal and a step S314 for counting the minimum signal.
  • a step S312 for counting the maximum signal there are three color sub-pixels: green sub-pixel, red sub-pixel, and blue sub-pixel. That is, step S310 counts the red sub-pixels.
  • the maximum signal of a color sub-pixel may be the maximum color gray scale of the color
  • the minimum signal may be the minimum color gray scale of the color.
  • the look-up table (LUT) is used to obtain the driving voltage R TH of the first sub-frame and the driving voltage R TL of the second sub-frame corresponding to the maximum signal of the red sub-pixel in each block.
  • the maximum voltage of the blue sub-pixel corresponds to the driving voltage B TH of the first sub-frame and the driving voltage B TL of the second sub-frame.
  • the lookup table is used to obtain the driving voltage R ′ TH of the first sub-frame and the driving voltage R ′ TL of the second sub-frame corresponding to the minimum signal of the red sub-pixel of each block, and the first sub-pixel corresponding to the minimum signal of the green sub-pixel
  • the minimum signal of the blue sub-pixel corresponds to the driving voltage B ′ TH of the first subframe and the driving voltage B ′ TL of the second subframe.
  • Step S320 can be executed after S312, and step S330 can be executed after S314.
  • Steps S312 to S320 and steps S314 to S330 are two parallel processes. There is no sequence requirement between the two parallel processes.
  • the calculation formula for the backlight brightness compensation signal L RL / L RH corresponding to the red sub-pixel is as follows:
  • G TH ⁇ L + G TL ⁇ L G TH ⁇ L GL + G TL ⁇ L GH (5)
  • the compensation signal may be determined by limiting the range of the difference between the backlight brightness compensation signals L RL and L RH .
  • the conditional formula is satisfied:
  • conditional expression (10) When conditional expression (10) is not satisfied, that is, when the driving voltage difference is not greater than the backlight brightness compensation threshold X, the backlight brightness compensation is not activated, and the backlight brightness of the liquid crystal display maintains the reference backlight brightness L, thereby avoiding the difference in voltage signal.
  • Backlight compensation for backlight brightness can reduce the complexity of the driving process and improve the stability of the system.
  • the conditional expressions are respectively satisfied:
  • X in equations (10), (11), and (12) are equal, that is, the red, green, and blue sub-pixels use the same backlight brightness compensation threshold. It can be understood that, in other embodiments, the red, green, and blue sub-pixels may also use different backlight brightness compensation thresholds, respectively.
  • the backlight module includes multiple regions that can independently control the brightness of the light
  • the pixels of different blocks on the display panel are individually compensated for the brightness of the backlight. Therefore, the brightness of the light in these regions will be different, and the difference between adjacent regions will be different. The difference in the brightness of the output light may cause the naked eye to notice the uneven brightness.
  • a step of adjusting a backlight brightness compensation signal of each area is also included to reduce the difference in light output brightness of adjacent areas.
  • the adjustment is implemented by a spatial low-pass smoothing filtering process. After the spatial low-pass smoothing filtering process, the backlight brightness compensation value of each area is not greatly different, which can avoid the phenomenon of uneven brightness and flicker due to the large difference in light brightness in adjacent areas.
  • the backlight brightness compensation value g (x, y) w1 * f (x -1, y-1) + w2 * f (x-1, y) + w3 * f (x-1, y + 1) + w4 * f (x, y-1) + w5 * f (x, y ) + w6 * f (x, y + 1) + w7 * f (x + 1, y-1) + w8 * f (x + 1, y) + w9 * f (x + 1, y + 1).
  • w1 to w9 are weights of each region, and specific values thereof can be designed by those skilled in the art through experiments and experience.
  • w1 + w2 + ... + w9 1. It can be understood that, for the areas located at the four corners of the backlight module 200, there are 3 adjacent areas; for the areas located on the side of the backlight module 200, there are 5 adjacent areas.
  • the present application further provides a display device 300 including a display panel 310, a backlight module 320, and a driving circuit 330.
  • the display device 300 may be a TN (Twisted Nematic), VA (Vertical Alignment), OCB (Optically Compensated Curved Alignment) type liquid crystal display, but is not limited thereto.
  • the backlight of the liquid crystal display can use direct or side backlight.
  • the backlight source is an RGB three-color backlight source, a WRGB four-color light source or an RGBY four-color light source.
  • the display device 300 may also be a liquid crystal display with a curved screen.
  • the backlight module includes a backlight source and a zone control unit.
  • the backlight source is a RGB three-color backlight source.
  • the partition control unit is used to divide the backlight source into multiple areas. Each area includes three light sources: red light source, green light source, and blue light source. Each light source in each area is independently controlled. Output brightness.
  • the pixels in the display panel are divided into blocks that correspond one-to-one to the areas of the backlight module.
  • the driving circuit is used to execute the driving method of the above display device. The method can be implemented in cooperation with software stored in the memory of the driving circuit, that is, through the cooperation of software and hardware, and can also be implemented using pure hardware circuits known in the art.

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Abstract

一种显示装置（300），包括显示面板（310）、背光模块（320）及驱动电路（330），背光模块（320）包括背光源和分区控制单元，分区控制单元用于将背光源划分为多个区域，并独立控制每个区域每种颜色光源的出光亮度，驱动电路（330）用于：获取需要显示的每帧图像的输入信号；将每帧图像通过前后两个子帧进行显示；根据每个区域所对应的像素的驱动电压，确定每个区域的背光亮度补偿信号的大小；根据背光亮度补偿信号调整每个区域的出光亮度。

Description

显示装置及其驱动方法 技术领域
本申请涉及显示器，特别是涉及一种显示装置，还涉及一种显示装置的驱动方法。
背景技术
垂直配向(VA)型液晶显示器是一种常见的液晶显示器。VA型液晶显示器在大的视角下亮度随驱动电压快速饱和，从而导致色偏较为严重，进而影响画质。
一种改善的方案是将每帧图像通过前后两个子帧进行显示(例如60Hz的图像通过一前一后两个120Hz的子帧进行显示)，且一个子帧的像素驱动电压为高电压，另一个子帧的像素驱动电压为低电压。
然而，这种方案在高、低电压相差较大时，人眼能够较明显地感觉到两个子帧的亮度差异导致的闪烁。
发明内容
根据本申请的各实施例，提供一种显示装置及其驱动方法。
一种显示装置的驱动方法，包括：将显示装置的背光源划分为多个区域，显示装置的像素被划分为与背光源的区域一一对应的区块；所述背光源包括多种颜色的光源；通过分区控制单元独立控制每个所述区域的每种颜色光源的出光亮度；获取需要显示的每帧图像的输入信号；将所述每帧图像通过前后两个子帧进行显示，且一个子帧的像素的驱动电压大于另一个子帧中同一像素的驱动电压；根据每个所述区域所对应的像素的驱动电压，确定每个所述区域的每种颜色光源分别对应两个子帧的背光亮度补偿信号的大小；其中， 所述驱动电压越高则背光亮度补偿信号越小、所述驱动电压越低则背光亮度补偿信号越大，以缓解两个子帧中同一像素的亮度差异；及根据所述背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度。
一种显示装置的驱动方法，包括：将显示装置的红绿蓝三色背光源划分为多个区域，显示装置的像素被划分为与背光源的区域一一对应的区块；通过分区控制单元独立控制每个所述区域的每种颜色光源的出光亮度；获取需要显示的每帧图像的输入信号；获取所述每帧图像对应的基准背光亮度信号；将所述每帧图像通过前后两个子帧进行显示，且一个子帧的像素的驱动电压大于另一个子帧中同一像素的驱动电压；统计每帧图像的输入信号中每种颜色子像素在每个所述区块的最大信号和最小信号；分别获取每种颜色子像素的所述最大信号的驱动电压，其中一个子帧的驱动电压记为第一驱动电压，另一个子帧的驱动电压记为第二驱动电压；分别获取每种颜色子像素的所述最小信号的驱动电压，其中一个子帧的驱动电压记为第三驱动电压，另一个子帧的驱动电压记为第四驱动电压；根据如下公式求取背光亮度补偿信号：
对于红色子像素：
L RL＜L＜L RH；
R TH×L+R TL×L＝R TH×L RL+R TL×L RH；
R′ TH×L+R′ TL×L＝R′ TH×L RL+R′ TL×L RH；
其中，L RL为每帧图像的两个子帧中红色子像素背光亮度补偿信号较小的一个、L RH为较大的一个，R TH为红色子像素的所述第一驱动电压、R TL为所述第二驱动电压、R′ TH为所述第三驱动电压、R′ TL为所述第四驱动电压，L为所述基准背光亮信号；
对于绿色子像素：
L GL＜L＜L GH；
G TH×L+G TL×L＝G TH×L GL+G TL×L GH；
G′ TH×L+G′ TL×L＝G′ TH×L GL+G′ TL×L GH；
其中，L GL为每帧图像的两个子帧中绿色子像素背光亮度补偿信号较 小的一个、L GH为较大的一个，G TH为所述第一驱动电压，G TL为所述第二驱动电压，G′ TH为所述第三驱动电压，G′ TL为所述第四驱动电压；
对于蓝色子像素：
L BL＜L＜L BH；
B TH×L+B TL×L＝B TH×L BL+B TL×L BH；
B′ TH×L+B′ TL×L＝B′ TH×L BL+B′ TL×L BH；
其中，L BL为每帧图像的两个子帧中蓝色子像素背光亮度补偿信号较小的一个、L BH为较大的一个，B TH为所述第一驱动电压，B TL为所述第二驱动电压，B′ TH为所述第三驱动电压，B′ TL为所述第四驱动电压；及根据每种颜色光源的背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度。
一种显示装置，包括：显示面板；背光模块，包括背光源和分区控制单元，所述背光源包括多种颜色的的光源，所述分区控制单元用于将所述背光源划分为多个区域，并独立控制每个区域每种光源的出光亮度，所述显示面板中的像素被划分为与背光模块的区域一一对应的区块；及驱动电路，包括：输入模块，用于获取需要显示的每帧图像的输入信号；高低电压分帧显示模块，用于将每帧图像通过前后两个子帧进行显示，且一个子帧的像素的驱动电压大于另一个子帧中同一像素的驱动电压；背光补偿确定模块，用于根据每个所述区域所对应的像素的驱动电压，确定每个所述区域的每种颜色光源分别对应两个子帧的背光亮度补偿信号的大小；驱动电压越高则背光亮度补偿信号越小、驱动电压越低则背光亮度补偿信号越大，以缓解两个子帧中同一像素的亮度差异；及背光亮度调整模块，用于根据所述背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度。
上述显示装置及其驱动方法，将每帧图像通过前后两个子帧进行显示，两个子帧中同一像素的驱动电压一高一低，且两个子帧的背光亮度一暗一亮，以缓解两个子帧中同一像素的亮度差异，从而减少两个子帧的驱动电压涨落造成的闪烁现象。分区控制单元将背光模块划分为多个可独立控制出光亮度的区域，相应地可以对显示面板上不同区块的像素进行单独的背光亮度补偿， 比起采用统一背光亮度的背光模块，具有更好的防闪烁效果。并且，采用上述显示装置的驱动方法，液晶显示器的像素不需要再分为主要和次要子像素，从而可以大大降低显示面板的工艺复杂度，且大大提升了液晶显示面板的穿透率和解析度，减少了背光设计的成本。
附图说明
图1是一实施例中的显示装置的驱动方法的流程图；
图2是一实施例中适用于显示装置的驱动方法的液晶显示器的背光模块的示意图；
图3是一实施例中步骤S130的子步骤的流程图；
图4是一实施例中对背光补偿值进行空间低通平滑滤波处理的示意图；
图5是一实施例中显示装置的框图。
具体实施方式
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的首选实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请的公开内容更加透彻全面。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“竖直的”、“水平的”、“上”、“下”、“左”、“右”以及类似的 表述只是为了说明的目的。
本申请的显示装置的驱动方法适用的显示装置可以为TN(扭曲向列)、VA(垂直配向)、OCB(光学补偿弯曲排列)等类型的液晶显示器，但并不限于此。该液晶显示器的背光可以运用直下或侧边背光，背光源为RGB三色背光源。该驱动方法同样适用于液晶显示器为曲面屏的情形，以及RGBW背光源、RGBY背光源。
图2是一实施例中适用于显示装置的驱动方法的显示装置的背光模块的示意图，该背光模块100包括背光源和分区控制单元，背光源的光线在分区控制单元的控制下使得背光模块100呈现出多个呈矩阵式排列的区域10(在本实施例中为9*7＝63个)，每个区域10由分区控制单元独立控制每种颜色光源的出光亮度，出射的光线通过液晶显示器的显示面板后进入人眼。我们根据每个区域10的出射光线将会照射至显示面板上的哪些像素，将显示面板划分为一个个区块，每个区块与背光模块的区域10一一对应。例如在图2所示实施例中，就是将显示面板划分为63个区块。
图1是一实施例中的显示装置的驱动方法的流程图，包括下列步骤：
S110，获取需要显示的每帧图像的输入信号。
液晶显示器从外界的设备——例如图形处理器(GPU)——获取需要显示的每帧图像的输入信号。液晶显示器还会根据该输入信号得到一个基准背光亮度(用于控制背光源的出光亮度，可以用一个基准背光亮度信号来表示)，该亮度为不进行背光补偿时的背光源的背光亮度。S120，将每帧图像通过前后两个子帧进行显示，一个子帧的像素的驱动电压大于另一个子帧。
将每帧图像通过前后两个子帧进行显示，也即将一帧图像在时序上分割为两帧图像，分别记为第一子帧和第二子帧，通过第一子帧和第二子帧相互补偿向用户显示出与输入信号对应的图像。在本实施例中，第一子帧上的每一个像素的驱动电压均大于第二子帧上对应子像素的驱动电压。也即，第一子帧采用高驱动电压进行驱动，而第二子帧采用低于第一子帧的低驱动电压进行驱动。第一子帧和第二子帧的每一子像素的驱动电压可以利用查找表 (LUT，Look UP Table)查找获取。具体地，液晶显示器内会预先将查找表存储在帧缓存(frame buffer)里面。查找表为输入信号的电压和与该输入信号对应的第一子帧、第二子帧的每一子像素的驱动电压的对应关系表。以8bit的驱动电压信号为例，每一R/G/B输入信号的颜色灰度值0～255对应有256对高低电压信号，共有3*256对高电压信号R TH/G TH/B TH与低电压信号R TL/G TL/B TL。因此，根据输入信号中每一子像素的颜色灰度值可以查找对应的高驱动电压和对应的低驱动电压，从而将该高驱动电压作为第一子帧中该子像素的驱动电压，将对应的低驱动电压作为第二子帧中该子像素的驱动电压。
S130，根据每个区域对应的像素的驱动电压，确定每个区域两子帧每种颜色光源的背光亮度补偿信号的大小。
背光模块的每个区域每种颜色光源的背光亮度补偿信号的大小，是根据其所对应的区块的像素的驱动电压的大小来确定，驱动电压越高则背光亮度补偿信号越小，驱动电压越低则背光亮度补偿信号越大。对于同一帧图像的两个驱动电压大小不同的子帧，背光亮度补偿信号的大小不同，高驱动电压的第一子帧通过一个较暗的背光亮度补偿信号进行补偿，低驱动电压的第二子帧通过一个较亮的背光亮度补偿信号进行补偿，以缓解每帧图像的两个子帧中同一像素的亮度差异。可以理解的，对于驱动电压一高一低的两个子帧，当通过背光亮度补偿信号使同一像素的亮度维持不变时，能够完全消除驱动电压的差值带来的闪烁。然而，不同像素的驱动电压差值可能是不同的，我们难以针对每一个像素进行单独的背光亮度补偿。本实施例中的背光模块包括多个可独立控制出光亮度的区域，相应地可以对显示面板上不同区块的像素进行单独的背光亮度补偿，比起采用统一背光亮度的背光模块，具有更好的防闪烁效果。
S140，根据背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度。
由于每帧图像是通过高驱动电压的第一子帧和低驱动电压的第二子帧来显示，因此背光模块的出光亮度也相应的为一个低亮度和一个高亮度，分别对应补偿第一子帧和第二子帧。由于背光模块每个区域的每种颜色光源的出 光亮度独立控制，显示面板每个区块的像素的驱动电压又有所不同，因此每个区域的背光亮度补偿信号乃至出光亮度也会有所不同。如果第一子帧和第二子帧的驱动电压差值较小，则对于任意一种颜色的光源，步骤S130中计算出的两个子帧的背光亮度补偿信号的大小差距不大。在一个实施例中，当第一子帧和第二子帧的驱动电压差值小于预设的背光亮度补偿阈值时，则不启动背光亮度补偿机制，背光模块直接采用基准背光亮度进行发光控制。在另一个实施例中，也可以是两个子帧的背光亮度补偿信号的差值小于预设的背光亮度补偿阈值时，不启动背光亮度补偿机制。
上述显示装置的驱动方法，将每帧图像通过前后两个子帧进行显示，两个子帧中同一像素的驱动电压一高一低，且两个子帧的背光亮度一暗一亮，以缓解两个子帧中同一像素的亮度差异，从而减少两个子帧的驱动电压涨落造成的闪烁现象。分区控制单元将背光模块划分为多个可独立控制出光亮度的区域，相应地可以对显示面板上不同区块的像素进行单独的背光亮度补偿，比起采用统一背光亮度的背光模块，具有更好的防闪烁效果。并且，采用上述显示装置的驱动方法，液晶显示器的像素不需要再分为主要和次要子像素，从而可以大大降低显示面板的工艺复杂度，且大大提升了液晶显示面板的穿透率和解析度，减少了背光设计的成本。
在一个实施例中，步骤S140是对下一帧图像进行背光亮度补偿，使得下一帧图像的两个子帧中驱动电压较高的子帧的背光亮度小于基准背光亮度、另一个子帧的背光亮度大于基准背光亮度。即当前显示的帧图像的背光亮度是根据前一帧图像计算出来的。由于相邻两帧图像一般是基本相同的，因此当前帧根据前一帧图像进行背光亮度补偿也是合理的。
在一个实施例中，步骤S130具体通过以下方式实现：
S310，统计每帧图像的输入信号中每种颜色子像素在每个区块的最大信号和最小信号。
参见图3，步骤S310又分为统计最大信号的步骤S312和统计最小信号的步骤S314。对于液晶显示器，一共有绿色子像素(Green sub-pixel)、红色 子像素(Red sub-pixel)、蓝色子像素(Blue sub-pixel)三种颜色的子像素，即步骤S310分别统计红色子像素在每个区块的最大信号和最小信号，绿色子像素在每个区块的最大信号和最小信号，蓝色子像素在每个区块的最大信号和最小信号。一种颜色子像素的最大信号可以为该颜色的颜色灰度最大值，最小信号可以为该颜色的颜色灰度最小值。
S320，分别获取每种颜色子像素的最大信号的驱动电压。
通过查找表(LUT)获取每个区块的红色子像素的最大信号对应的第一子帧的驱动电压R TH和第二子帧的驱动电压R TL，绿色子像素的最大信号对应的第一子帧的驱动电压G TH和第二子帧的驱动电压G TL，蓝色子像素的最大信号对应的第一子帧的驱动电压B TH和第二子帧的驱动电压B TL。
S330，分别获取每种颜色子像素的最小信号的驱动电压。
通过查找表获取每个区块的红色子像素的最小信号对应的第一子帧的驱动电压R′ TH和第二子帧的驱动电压R′ TL，绿色子像素的最小信号对应的第一子帧的驱动电压G′ TH和第二子帧的驱动电压G′ TL，蓝色子像素的最小信号对应的第一子帧的驱动电压B′ TH和第二子帧的驱动电压B′ TL。步骤S320在S312之后执行即可，步骤S330在S314之后执行即可，从步骤S312到S320与从步骤S314到S330为两个并行的流程，两个并行流程相互间没有顺序上的先后要求。
S340，根据最大、最小信号的驱动电压以及基准背光亮度信号求取背光亮度补偿信号。
根据红色子像素的第一驱动电压R TH、第二驱动电压R TL、第三驱动电压R′ TH、第四驱动电压R′ TL，绿色子像素的第一驱动电压G TH、第二驱动电压G TL、第三驱动电压G′ TH、第四驱动电压G′ TL，蓝色子像素的第一驱动电压B TH、第二驱动电压B TL、第三驱动电压B′ TH、第四驱动电压B′ TL，以及基准背光亮度信号L，分别求取红色子像素第一子帧的背光亮度补偿信号L RL和第二子帧的背光亮度补偿信号L RH，绿色子像素第一子帧的背光亮度补偿信号L GL和第二子帧的背光亮度补偿信号L GH，蓝色子像素第一子帧的背光亮度补偿信号L BL和第 二子帧的背光亮度补偿信号L BH。
在一个实施例中，红色子像素对应的背光亮度补偿信号L RL/L RH的计算公式如下：
L RL＜L＜L RH
(1)R TH×L+R TL×L＝R TH×L RL+R TL×L RH
(2)R′ TH×L+R′ TL×L＝R′ TH×L RL+R′ TL×L RH
(3)绿色子像素对应的背光亮度补偿信号L GL/L GH的计算公式如下：
L GL＜L＜L GH     (4)
G TH×L+G TL×L＝G TH×L GL+G TL×L GH    (5)
G′ TH×L+G′ TL×L＝G′ TH×L GL+G′ TL×L GH    (6)
蓝色子像素对应的背光亮度补偿信号的L BL/L BH的计算公式如下：
L BL＜L＜L BH    (7)
B TH×L+B TL×L＝B TH×L BL+B TL×L BH    (8)
B′ TH×L+B′ TL×L＝B′ TH×L BL+B′ TL×L BH    (9)
通过求解公式(1)～(3)，可能会获取到多组满足要求的背光亮度补偿信号L RL和L RH，同理，求取公式(4)～(6)可能会获取到多组L GL和L GH，求取公式(7)～(9)可能会获取到多组L BL和L BH。因此，可以增加相应的辅助条件，确定其中一组最为理想的补偿值。例如，可以通过限定背光亮度补偿信号L RL和L RH之间的差值范围来确定补偿信号。在本实施例中，在计算过程中还需要判断第一驱动电压和第二驱动电压之间的差值是否大于背光亮度补偿阈值，也即对于红色子像素，满足条件式：
R TH-R TL＞X
(10)当不满足条件式(10)时，也即驱动电压差异不大于背光亮度补偿阈值 X时，不启动背光亮度补偿，液晶显示器的背光亮度保持基准背光亮度L，从而避免电压信号差异较小时仍对背光亮度进行背光补偿，可以降低驱动过程的复杂度，从而提高系统的稳定性。对于绿色子像素和蓝色子像素，分别满足条件式：
G TH-G TL＞X      (11)
B TH-B TL＞X       (12)
在上述实施例中，式(10)、(11)、(12)中的X相等，即红、绿、蓝色子像素采用同一背光亮度补偿阈值。可以理解的，在其他实施例中，红、绿、蓝色子像素也可以分别采用不同的背光亮度补偿阈值。
可以理解的，由于背光模块包括多个可独立控制出光亮度的区域，对显示面板上不同区块的像素进行单独的背光亮度补偿，因此这些区域的出光亮度会有差异，而相邻区域间的出光亮度差异使得肉眼可能会察觉到亮度不均匀的现象。为了解决或减轻此缺陷，在一实施例中，步骤S140之前还包括对各区域的背光亮度补偿信号进行调整，以缓和相邻区域的出光亮度差异的步骤。进一步地，在一个实施例中，该调整是通过空间低通平滑滤波处理实现。经过空间低通平滑滤波处理后，各个区域的背光亮度补偿值不至于差异甚大，能够避免相邻的区域因出光亮度差异大造成亮度不均与闪烁的现象。
空间低通平滑滤波处理等价于考量背光模块每个区域周围的其他区域的出光亮度，然后据此对该区域的背光亮度补偿值进行调整。可以理解的，由于一帧图像的两个子帧各对应一个背光亮度补偿信号，因此需要对这两个背光亮度补偿信号分别进行空间低通平滑滤波处理(两个信号处理的原理是一样的)。以图4所示9*7＝63个区域的背光模块200为例，对第一子帧对应的背光亮度补偿信号的空间低通平滑滤波处理进行说明：假设图中标示有f(x,y)的区域计算出的背光亮度补偿值为f(x,y)，其中x、y分别表示横、纵坐标，由于每个区域包括RGB三色光源，f(x,y)与三色光源的背光亮度补偿信号L RL、L GL、L BL相关，进行空间低通平滑滤波处理时是对三种颜色分别进行处理(即以f(x,y)＝L RL，f(x,y)＝L GL，f(x,y)＝L BL分别进行计算)。由于与该区域相邻的区 域一共有8个(已在图4中标出)，则该区域通过空间低通平滑滤波处理后得到的背光亮度补偿值g(x,y)＝w1*f(x-1,y-1)+w2*f(x-1,y)+w3*f(x-1,y+1)+w4*f(x,y-1)+w5*f(x,y)+w6*f(x,y+1)+w7*f(x+1,y-1)+w8*f(x+1,y)+w9*f(x+1,y+1)。其中w1～w9为各区域的权重，其具体取值可以由本领域技术人员通过实验和经验自行设计。一般地，w1+w2+…+w9＝1。可以理解的，对于位于背光模块200四个角的区域，相邻区域有3个；对于位于背光模块200边上的区域，相邻区域有5个。
参见图5，本申请还提供一种显示装置300，包括显示面板310、背光模块320及驱动电路330。显示装置300可以为TN(扭曲向列)、VA(垂直配向)、OCB(光学补偿弯曲排列)等类型的液晶显示器，但并不限于此。该液晶显示器的背光可以运用直下或侧边背光，背光源为RGB三色背光源、WRGB四色光源或者RGBY四色光源。显示装置300还可以为曲面屏的液晶显示器。
在一个实施例中，背光模块包括背光源和分区控制单元。背光源是RGB三色背光源，分区控制单元用于将背光源划分为多个区域，每个区域均包括红光源、绿光源及蓝光源三种光源，并独立控制每个区域每种光源的出光亮度。显示面板中的像素被划分为与背光模块的区域一一对应的区块。驱动电路用于执行上述显示装置的驱动方法，该方法可以配合存储于驱动电路中的存储器的软件实现，即通过软硬件的配合工作实现，也可以采用本领域习知的纯硬件电路实现。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围 应以所附权利要求为准。

Claims (17)

  1. 一种显示装置的驱动方法，包括：
    将显示装置的背光源划分为多个区域，显示装置的像素被划分为与背光源的区域一一对应的区块；所述背光源包括多种颜色的光源；
    通过分区控制单元独立控制每个所述区域的每种颜色光源的出光亮度；
    获取需要显示的每帧图像的输入信号；
    将所述每帧图像通过前后两个子帧进行显示，且一个子帧的像素的驱动电压大于另一个子帧中同一像素的驱动电压；
    根据每个所述区域所对应的像素的驱动电压，确定每个所述区域的每种颜色光源分别对应两个子帧的背光亮度补偿信号的大小；其中，所述驱动电压越高则背光亮度补偿信号越小、所述驱动电压越低则背光亮度补偿信号越大，以缓解两个子帧中同一像素的亮度差异；及
    根据所述背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度。
  2. 根据权利要求1所述的方法，其中，所述方法还包括获取所述每帧图像对应的基准背光亮度信号的步骤；
    所述根据每个所述区域所对应的像素的驱动电压，确定每个所述区域的每种颜色光源分别对应两个子帧的背光亮度补偿信号的大小的步骤包括：
    统计每帧图像的输入信号中每种颜色子像素在每个所述区块的最大信号和最小信号；
    分别获取每种颜色子像素的所述最大信号的驱动电压，其中一个子帧的驱动电压记为第一驱动电压，另一个子帧的驱动电压记为第二驱动电压；
    分别获取每种颜色子像素的所述最小信号的驱动电压，其中一个子帧的驱动电压记为第三驱动电压，另一个子帧的驱动电压记为第四驱动电压；及
    根据所述第一驱动电压、第二驱动电压、第三驱动电压、第四驱动电压以及基准背光亮度信号求取所述背光亮度补偿信号。
  3. 根据权利要求2所述的方法，其中，所述背光源是红绿蓝三色背光源。
  4. 根据权利要求3所述的方法，其中，所述根据所述第一驱动电压、第二驱动电压、第三驱动电压、第四驱动电压以及基准背光亮度信号求取所述背光亮度补偿信号的步骤，是根据如下公式进行计算：
    对于红色子像素：
    L RL＜L＜L RH；
    R TH×L+R TL×L＝R TH×L RL+R TL×L RH；
    R′ TH×L+R′ TL×L＝R′ TH×L RL+R′ TL×L RH；
    其中，L RL为每帧图像的两个子帧中红色子像素背光亮度补偿信号较小的一个、L RH为较大的一个，R TH为红色子像素的所述第一驱动电压、R TL为所述第二驱动电压、R′ TH为所述第三驱动电压、R′ TL为所述第四驱动电压，L为所述基准背光亮信号；
    对于绿色子像素：
    L GL＜L＜L GH；
    G TH×L+G TL×L＝G TH×L GL+G TL×L GH；
    G′ TH×L+G′ TL×L＝G′ TH×L GL+G′ TL×L GH；
    其中，L GL为每帧图像的两个子帧中绿色子像素背光亮度补偿信号较小的一个、L GH为较大的一个，G TH为所述第一驱动电压，G TL为所述第二驱动电压，G′ TH为所述第三驱动电压，G′ TL为所述第四驱动电压；
    对于蓝色子像素：
    L BL＜L＜L BH；
    B TH×L+B TL×L＝B TH×L BL+B TL×L BH；
    B′ TH×L+B′ TL×L＝B′ TH×L BL+B′ TL×L BH；
    其中，L BL为每帧图像的两个子帧中蓝色子像素背光亮度补偿信号较小的一个、L BH为较大的一个，B TH为所述第一驱动电压，B TL为所述第二驱动电压，B′ TH为所述第三驱动电压，B′ TL为所述第四驱动电压。
  5. 根据权利要求4所述的方法，其中，每个所述区域的每种颜色子像素 的所述第一驱动电压与所述第二驱动电压的差值不大于各自颜色的背光亮度补偿阈值时，不启动该区域该颜色光源的背光亮度补偿。
  6. 根据权利要求1所述的方法，其中，所述根据所述背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度的步骤，是对下一帧图像进行背光亮度补偿。
  7. 根据权利要求1所述的方法，其中，所述根据所述背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度的步骤之前，还包括对各区域的背光亮度补偿信号进行调整，以缓和相邻区域的出光亮度差异的步骤。
  8. 根据权利要求7所述的方法，其中，所述对各区域的背光亮度补偿信号进行调整的步骤，是通过空间低通平滑滤波处理实现。
  9. 一种显示装置，包括：
    显示面板；
    背光模块，包括背光源和分区控制单元，所述背光源包括多种颜色的光源，所述分区控制单元将所述背光源划分为多个区域，并独立控制每个区域每种光源的出光亮度，所述显示面板中的像素被划分为与背光模块的区域一一对应的区块；及
    驱动电路，包括：
    输入模块，设置为获取需要显示的每帧图像的输入信号；
    高低电压分帧显示模块，设置为将每帧图像通过前后两个子帧进行显示，且一个子帧的像素的驱动电压大于另一个子帧中同一像素的驱动电压；
    背光补偿确定模块，设置为根据每个所述区域所对应的像素的驱动电压，确定每个所述区域的每种颜色光源分别对应两个子帧的背光亮度补偿信号的大小；驱动电压越高则背光亮度补偿信号越小、驱动电压越低则背光亮度补偿信号越大，以缓解两个子帧中同一像素的亮度差异；及
    背光亮度调整模块，设置为根据所述背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度。
  10. 根据权利要求9所述的显示装置，其中，所述驱动电路还包括设置 为获取所述每帧图像对应的基准背光亮度信号的基准背光亮度模块。
  11. 根据权利要求10所述的显示装置，其中，所述背光补偿确定模块包括：
    最值信号统计单元，设置为统计每帧图像的输入信号中每种颜色子像素在每个所述区块的最大信号和最小信号；
    最大信号获取单元，设置为分别获取每种颜色子像素的所述最大信号的驱动电压，其中一个子帧的驱动电压记为第一驱动电压，另一个子帧的驱动电压记为第二驱动电压；
    最小信号获取单元，设置为分别获取每种颜色子像素的所述最小信号的驱动电压，其中一个子帧的驱动电压记为第三驱动电压，另一个子帧的驱动电压记为第四驱动电压；及
    背光亮度补偿信号计算单元，设置为根据所述第一驱动电压、第二驱动电压、第三驱动电压、第四驱动电压以及基准背光亮度信号求取所述背光亮度补偿信号。
  12. 根据权利要求11所述的显示装置，其中，所述背光补偿确定模块在每个所述区域的每种颜色子像素的所述第一驱动电压与所述第二驱动电压的差值不大于各自颜色的背光亮度补偿阈值时，不启动该区域该颜色光源的背光亮度补偿。
  13. 根据权利要求9所述的显示装置，其中，所述背光亮度调整模块根据所述背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度，是对下一帧图像进行背光亮度补偿。
  14. 根据权利要求9所述的显示装置，其中，所述驱动电路还包括：
    空间低通平滑滤波器，设置为对各所述区域的背光亮度补偿信号进行调整，以缓和相邻区域的出光亮度。
  15. 根据权利要求14所述的显示装置，其中，所述背光亮度调整模块是根据所述空间低通平滑滤波器调整后的背光亮度补偿信号调整每个区域的出光亮度。
  16. 根据权利要求9所述的显示装置，其特征在于，所述背光源是红绿蓝三色背光源。
  17. 一种显示装置的驱动方法，包括：
    将显示装置的红绿蓝三色背光源划分为多个区域，显示装置的像素被划分为与背光源的区域一一对应的区块；
    通过分区控制单元独立控制每个所述区域的每种颜色光源的出光亮度；
    获取需要显示的每帧图像的输入信号；
    获取所述每帧图像对应的基准背光亮度信号；
    将所述每帧图像通过前后两个子帧进行显示，且一个子帧的像素的驱动电压大于另一个子帧中同一像素的驱动电压；
    统计每帧图像的输入信号中每种颜色子像素在每个所述区块的最大信号和最小信号；
    分别获取每种颜色子像素的所述最大信号的驱动电压，其中一个子帧的驱动电压记为第一驱动电压，另一个子帧的驱动电压记为第二驱动电压；
    分别获取每种颜色子像素的所述最小信号的驱动电压，其中一个子帧的驱动电压记为第三驱动电压，另一个子帧的驱动电压记为第四驱动电压；根据如下公式求取背光亮度补偿信号：
    对于红色子像素：
    L RL＜L＜L RH；
    R TH×L+R TL×L＝R TH×L RL+R TL×L RH；
    R′ TH×L+R′ TL×L＝R′ TH×L RL+R′ TL×L RH；
    其中，L RL为每帧图像的两个子帧中红色子像素背光亮度补偿信号较小的一个、L RH为较大的一个，R TH为红色子像素的所述第一驱动电压、R TL为所述第二驱动电压、R′ TH为所述第三驱动电压、R′ TL为所述第四驱动电压，L为所述基准背光亮信号；
    对于绿色子像素：
    L GL＜L＜L GH；
    G TH×L+G TL×L＝G TH×L GL+G TL×L GH；
    G′ TH×L+G′ TL×L＝G′ TH×L GL+G′ TL×L GH；
    其中，L GL为每帧图像的两个子帧中绿色子像素背光亮度补偿信号较小的一个、L GH为较大的一个，G TH为所述第一驱动电压，G TL为所述第二驱动电压，G′ TH为所述第三驱动电压，G′ TL为所述第四驱动电压；
    对于蓝色子像素：
    L BL＜L＜L BH；
    B TH×L+B TL×L＝B TH×L BL+B TL×L BH；
    B′ TH×L+B′ TL×L＝B′ TH×L BL+B′ TL×L BH；
    其中，L BL为每帧图像的两个子帧中蓝色子像素背光亮度补偿信号较小的一个、L BH为较大的一个，B TH为所述第一驱动电压，B TL为所述第二驱动电压，B′ TH为所述第三驱动电压，B′ TL为所述第四驱动电压；及
    根据每种颜色光源的背光亮度补偿信号调整每个区域的每种颜色光源的出光亮度。
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