WO2020077900A1 - 驱动电压补偿方法、灰阶补偿方法以及显示装置 - Google Patents

驱动电压补偿方法、灰阶补偿方法以及显示装置 Download PDF

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Publication number
WO2020077900A1
WO2020077900A1 PCT/CN2019/071401 CN2019071401W WO2020077900A1 WO 2020077900 A1 WO2020077900 A1 WO 2020077900A1 CN 2019071401 W CN2019071401 W CN 2019071401W WO 2020077900 A1 WO2020077900 A1 WO 2020077900A1
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Prior art keywords
gray
voltage
driving voltage
scale
pixel
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English (en)
French (fr)
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黄鹏程
李威
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US16/320,369 priority Critical patent/US10854153B2/en
Publication of WO2020077900A1 publication Critical patent/WO2020077900A1/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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

Definitions

  • the present application relates to the field of display technology, and in particular, to a driving voltage compensation method, a gray scale compensation method, and a display device.
  • the display effect of display products is continuously improved, so that the application of display products is more and more widely.
  • the existing display panel is prone to uneven light emission between pixels due to manufacturing processes and aging of light-emitting materials, that is, different pixels emit different brightness when inputting the same image signal (generally gray-scale voltage), which affects the image Display quality.
  • G the compensated driving grayscale voltage
  • g the pixel in the next frame image
  • a the fixed compensation value corresponding to the pixel
  • the present application provides a driving voltage compensation method, a gray scale compensation method, and a display device, so as to alleviate the technical problem of uneven pixel display in the existing display panel.
  • An embodiment of the present application provides a pixel driving voltage compensation method, which includes:
  • the gamma curve being a corresponding curve of the driving voltage of the pixel and the luminous brightness
  • the driving voltage divides the driving voltage into at least two driving voltage regions, and determine test points in each driving voltage region; different driving voltage regions correspond to different driving voltage compensation rules;
  • the driving voltage of the pixel is compensated.
  • the step of compensating for the driving voltage of the pixel according to the driving voltage compensation parameter corresponding to the driving voltage area includes:
  • the pixel According to the actual driving voltage of the pixel in the next frame image, the pixel is driven to emit light.
  • the step of determining test points in each driving voltage area includes:
  • the step of obtaining the actual driving voltage required when the luminous brightness of the pixel reaches the brightness value includes:
  • the corresponding driving voltage is used as the actual drive voltage required when the light emission brightness of the pixel reaches the brightness value.
  • the step of compensating for the driving voltage of the pixel according to the driving voltage compensation parameter corresponding to the driving voltage area includes:
  • the pixel According to the actual driving voltage of the pixel in the next frame image, the pixel is driven to emit light.
  • an embodiment of the present application also provides a grayscale compensation method for a display panel, which includes:
  • the gamma curve being a corresponding curve of the gray-scale voltage of the pixels in the display panel and the luminous brightness
  • the gray-scale voltage divides the gray-scale voltage into at least two gray-scale voltage regions, and determine the test points in each gray-scale voltage region; different gray-scale voltage regions correspond to different gray-scale compensation rules;
  • the grayscale compensation parameters corresponding to each grayscale voltage area are obtained;
  • the gray scale compensation parameter corresponding to the gray scale voltage area compensate the gray scale voltage of the pixels in the display panel.
  • the step of compensating the grayscale voltage of the pixels in the display panel according to the grayscale compensation parameters corresponding to the grayscale voltage region includes:
  • the pixel is driven to emit light.
  • the step of determining test points in each gray-scale voltage region includes:
  • a corresponding number of test points are set in the gray scale voltage area.
  • the step of dividing the gray-scale voltage into at least two gray-scale voltage regions according to the gamma curve includes:
  • the gray-scale voltage is divided into a first gray-scale voltage region, a second gray-scale voltage region, and a third gray-scale voltage region in order from small to large.
  • the grayscale compensation rule corresponding to the first grayscale voltage region is a quadratic function
  • the grayscale compensation rule corresponding to the second grayscale voltage region is a linear function
  • the third gray The gray scale compensation rule corresponding to the second-order voltage area is a quadratic function.
  • the step of compensating the grayscale voltage of the pixels in the display panel according to the grayscale compensation parameters corresponding to the grayscale voltage region includes:
  • the pixel is driven to emit light.
  • the step of acquiring the actual gray-scale voltage required when the light-emitting brightness of the pixel reaches the brightness value includes:
  • the corresponding gray-scale voltage is used as the actual gray-scale voltage required when the light-emitting brightness of the pixel reaches the brightness value.
  • an embodiment of the present application also provides a display device, which includes a display panel, a driving chip, a lighting module, a processor, and a memory, where:
  • the processor is used to determine a gamma curve of the display panel, the gamma curve is a corresponding curve of the gray-scale voltage of the pixels in the display panel and the luminous brightness; according to the gamma curve, the gray-scale voltage is divided At least two gray-scale voltage zones, and determine the test points in each gray-scale voltage zone; determine the gray-scale voltage corresponding to the test point, the corresponding brightness value in the gamma curve; different gray-scale voltage zones correspond The gray scale compensation rules are different;
  • the lighting module is used to collect the luminous brightness of the pixels
  • the driving chip is used to drive pixels in the display panel to emit light
  • the processor is also used to obtain the actual grayscale voltage required when the pixel reaches the brightness value; according to the mapping relationship between the grayscale voltage of the test point in each grayscale voltage area and the actual grayscale voltage, and the grayscale
  • the gray scale compensation rules of the voltage area, the gray scale compensation parameters corresponding to each gray scale voltage area are obtained, and stored in the memory;
  • the driving chip is further used to drive the pixels in the display panel to emit light after compensating the gray-scale voltages of the pixels in the display panel according to the gray-scale compensation parameters corresponding to the gray-scale voltage area;
  • the memory is used to store programs necessary to realize the functions of the processor, as well as the gray-scale voltage region corresponding to each pixel in at least one gamma curve, the gray-scale compensation rule corresponding to each gray-scale voltage region, and gray-scale compensation parameter.
  • the lighting module includes a camera.
  • the camera includes a charge coupling device camera.
  • the memory includes flash memory.
  • the memory stores a plurality of sets of data corresponding to gamma, each set of data includes a range of multiple gray-scale voltage regions, and the gray-scale corresponding to each gray-scale voltage region Compensation rules and gray scale compensation parameters.
  • the display device further includes a gamma curve adjustment module, the gamma curve adjustment module is used to adjust the gray scale of the video signal provided by the driver chip according to the brightness change of the display device environment The required gamma curve.
  • the gamma curve adjustment module includes an ambient light processing unit and a gamma curve adjuster
  • the ambient light processing unit is used to sense a brightness change of the environment of the display device and output a brightness signal
  • the gamma curve adjuster is used to search for the gamma curve corresponding to the brightness signal according to the built-in lookup table.
  • the ambient light processing unit includes a light sensor and a light amplification processor
  • the light sensor is used to sense a change in the brightness of the environment of the display device, and output a light sensing signal
  • the light The amplification processor is used for optimizing the light sensing signal to obtain the brightness signal.
  • the present application provides a new driving voltage compensation method, gray scale compensation method, and display device.
  • the method divides the driving voltage or gray scale voltage into a plurality of different driving voltage areas or gray scale voltage areas and other areas, which are different areas. Configure different compensation rules, and obtain the compensation parameters corresponding to each area through the test points in each area. In the subsequent compensation, the corresponding compensation parameters will be determined according to the required driving voltage or gray-scale voltage, and then based on the compensation parameters Obtain the compensated driving voltage or gray-scale voltage and drive the pixels to emit light, so that the compensation effect is closer to the actual gamma curve, to alleviate the technical problem of uneven pixel display in the existing display panel, and increase the product yield of the display device To improve user experience.
  • FIG. 1 is a flowchart of a driving voltage compensation method provided by an embodiment of the present application.
  • FIG. 2 is a flowchart of a gray scale compensation method provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a display device provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a gamma curve provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of gray-scale voltage division provided by an embodiment of the present application.
  • the pixel driving voltage compensation method includes the following steps:
  • the gamma curve is the corresponding curve of the driving voltage of the pixel and the luminous brightness; the formula of the gamma curve is:
  • Y is a power function of (x / z), the power index is ⁇ , x is the driving voltage, Lx is the pixel's driving voltage is the corresponding luminous brightness when x, z is the maximum driving voltage, Lz is the pixel's driving voltage is The corresponding light emission brightness at the maximum driving voltage z, ⁇ is the target gamma value of the display panel.
  • the target gamma value may be set to 2.2, or may be set according to user needs, etc., and is not specifically limited.
  • the horizontal axis represents the gray level of the video signal
  • the vertical axis represents the brightness (cd / m2).
  • the gamma value of the tone gamma curve of the solid line (-) is 2.2
  • the gamma value of the tone gamma curve of the dotted line (-) The horse value is 1.3
  • the gamma value of the gradation gamma curve of the dotted line (-.-) is the experimental value obtained from cumbersome experiments (for example, it can be 2.0, 1. 8), where the experimental value should depend on the actual situation, so it is not limited to this.
  • the number of tone gamma curves can be relatively increased or decreased according to actual conditions.
  • the target display brightness when the driving voltage of each group of red sub-pixels, green sub-pixels and blue sub-pixels of the OLED display panel is z is calculated according to the chromaticity formula.
  • a red subpixel, a blue subpixel, and a green subpixel form a group of subpixels, that is, a pixel, and the driving voltage of each subpixel in each pixel can be obtained according to the chromaticity formula when the driving voltage is z
  • the target display brightness This embodiment calculates the target display brightness when the driving voltage of each group of red, green and blue sub-pixels is z according to the white target chromaticity value and the white target luminance value in combination with the chromaticity formula.
  • the uneven light emission between the pixels can realize the adjustment of the white balance of the OLED display panel and eliminate the color shift of the OLED display panel.
  • Different display devices such as mobile phones, display screens, TVs, etc.
  • the same display device can also have different gamma curves in different scenes, such as different lighting (indoor, outdoor, etc.), so this step first Determine a gamma curve.
  • the number of driving voltage regions can be infinite, so that in each driving voltage region, the gamma curve is approximately linear, which can make the compensation effect more accurate.
  • different driving voltage regions correspond to different driving voltage compensation rules.
  • the driving voltage is simply divided into three regions. At this time, in this step, the driving voltage is divided into at least two driving voltage regions according to the gamma curve.
  • the driving voltage is sequentially divided into a first driving voltage region, a second driving voltage region, and a third driving voltage region in ascending order.
  • the compensation rule corresponding to the first driving voltage zone is a quadratic function
  • the compensation rule corresponding to the second driving voltage zone is a linear function
  • the compensation rule corresponding to the third driving voltage zone is quadratic function
  • determining the test points in each driving voltage area in this step includes:
  • the driving voltage compensation rule corresponding to a driving voltage area is a quadratic function, for example:
  • G a1 * (g * g) + b1 * g + c1;
  • G is the compensated driving voltage
  • g is the corresponding driving voltage of the pixel in the image content of the next frame
  • a1, b1, and c1 are the compensation parameters.
  • the number of corresponding compensation coefficients is 3, and 3 or more test points can be set in this area.
  • the test points can be evenly distributed in the driving voltage area.
  • the end point of the driving voltage region can be used as the test point, so that adjacent driving voltage regions can share such test points.
  • This step can be obtained based on the measurement of the gamma curve, or can be calculated according to the formula corresponding to the gamma curve, and will not be described in detail.
  • this step includes:
  • the corresponding driving voltage is used as the actual drive voltage required when the light emission brightness of the pixel reaches the brightness value.
  • This step is conventional clustering and fitting, which will be described in detail below.
  • this step includes:
  • the pixel According to the actual driving voltage of the pixel in the next frame image, the pixel is driven to emit light.
  • the method shown in FIG. 1 further includes the following steps:
  • the gamma curve required to provide the gray scale of the video signal is adjusted.
  • the step of adjusting the gamma curve required to provide the gray level of the video signal according to the brightness change of the display device environment includes:
  • the step of sensing the brightness change of the environment of the display device and outputting the brightness signal includes:
  • the light sensor senses the brightness change of the environment of the display device and outputs a light sensing signal
  • the light amplification processor performs optimization processing on the light sensing signal to obtain the brightness signal.
  • an embodiment of the present application further provides a display device, which includes a display panel and a processor, the display panel includes a plurality of pixels, and the processor is used to determine a gamma curve of the pixel, according to the gamma curve , Divide the driving voltage into at least two driving voltage areas, and determine the test points in each driving voltage area; determine the driving voltage corresponding to the test point, and the corresponding brightness value in the gamma curve; obtain the pixels The actual driving voltage required when the light emission brightness reaches the brightness value; according to the mapping relationship between the driving voltage of the test point in each driving voltage area and the actual driving voltage, and the driving voltage compensation rule of the driving voltage area, each driving is obtained A driving voltage compensation parameter corresponding to the voltage area; according to the driving voltage compensation parameter corresponding to the driving voltage area, the driving voltage of the pixel is compensated.
  • the processor is specifically configured to: obtain a home drive voltage area of the drive voltage of the pixel in the next frame image; according to the drive voltage compensation parameter corresponding to the home drive voltage area, and the The driving voltage of the pixel in the image of the next frame obtains the actual driving voltage of the pixel in the image of the next frame; according to the actual driving voltage of the pixel in the image of the next frame, the pixel is driven to emit light.
  • the processor is specifically configured to: determine the number of compensation coefficients corresponding to the driving voltage compensation rule of the driving voltage area; determine the number of test points required according to the number of compensation coefficients; A corresponding number of test points are set in the driving voltage area.
  • the present application provides a new driving voltage compensation method and display device.
  • the method divides the driving voltage into a plurality of different driving voltage regions, configures different compensation rules for different regions, and obtains each test point through each region. Compensation parameters corresponding to each area, in the subsequent compensation, the corresponding compensation parameters will be determined according to the driving voltage that needs to be output, and then the compensated driving voltage is obtained based on the compensation parameters and the pixels are driven to emit light, so that the compensation effect and the actual gamma
  • the curve is closer to alleviate the technical problem of uneven pixel display in the existing display panel, increase the product yield of the display device, and improve the user experience.
  • a driving voltage of 255 gray levels and a gamma of 2.2 are used as an example for description.
  • the driving voltage may be any number of gray levels, and the gamma is any value greater than 1.
  • the gray scale compensation of the display panel includes the following steps:
  • the gamma curve is a corresponding curve of the gray-scale voltage of the pixels in the display panel and the luminous brightness.
  • the gamma curve is a curve with a gamma of 2.2.
  • this step includes: determining the change trend of the gray scale voltage and the luminous brightness corresponding to the gamma curve; according to the change trend, dividing the gray scale voltage in order from small to large in order The first gray scale voltage area, the second gray scale voltage area, and the third gray scale voltage area.
  • the grayscale compensation rule corresponding to the first grayscale voltage region is a quadratic function
  • the grayscale compensation rule corresponding to the second grayscale voltage region is a linear function
  • the third grayscale The gray scale compensation rule corresponding to the voltage area is a quadratic function.
  • this step includes: determining the number of compensation coefficients corresponding to the grayscale compensation rule in the grayscale voltage region; determining the number of test points required according to the number of compensation coefficients; and in the grayscale voltage Set a corresponding number of test points in the area.
  • the 225-level gray-scale voltage is divided into a low gray-scale area (1 to 30 gray-scale, corresponding to the first gray-scale area), and a medium gray-scale area (30 to 237 gray-scale, corresponding to the second gray-scale. Area), and high gray scale area (237 to 255 gray scale, corresponding to the third gray scale area).
  • the grayscale compensation rules corresponding to the low grayscale area are:
  • G a1 * (g * g) + b1 * g + c1;
  • the gray scale compensation rules corresponding to the high gray scale area are:
  • G a2 * (g * g) + b2 * g + c2;
  • the gray scale compensation rules corresponding to the middle gray scale area are:
  • G is the compensated driving voltage
  • g is the corresponding driving voltage of the pixel in the next frame of image content
  • a1, b1, c1, a2, b2, c2, a3, and b3 are the compensation parameters.
  • the grayscale voltage g1 of the test point x1 corresponds to L1
  • the grayscale voltage g2 of the test point x2 corresponds to L2
  • the grayscale voltage g3 of the test point x3 corresponds to L3
  • the grayscale voltage g4 of the test point x4 corresponds to L4
  • the gray of the test point x5 The step voltage g5 corresponds to L5
  • the gray scale voltage g6 of the test point x6 corresponds to L6.
  • this step includes:
  • the corresponding gray-scale voltage is used as the actual gray-scale voltage required when the light-emitting brightness of the pixel reaches the brightness value.
  • the actual grayscale voltage is G1
  • the actual grayscale voltage is G2
  • the actual grayscale voltage is G3
  • the actual grayscale voltage is G3
  • the luminous brightness reaches L4
  • the corresponding actual gray-scale voltage at the time is G4
  • the corresponding actual gray-scale voltage at the light-emitting brightness reaches L5 is G5
  • the corresponding gray-scale voltage at the light-emitting brightness reaches L6 is G6.
  • the mapping relationship between the grayscale voltage at the test point x1 and the actual grayscale voltage is g1-G1
  • the mapping relationship between the grayscale voltage at the test point x2 and the actual grayscale voltage is g2-G2
  • the grayscale voltage at the test point x3 The mapping relationship between the actual gray-scale voltage is g3-G3, the mapping relationship between the gray-scale voltage at the test point x4 and the actual gray-scale voltage is g4-G4
  • the mapping relationship between the gray-scale voltage at the test point x5 and the actual gray-scale voltage is g5 -G5
  • the mapping relationship between the grayscale voltage of the test point x6 and the actual grayscale voltage is g6-G6.
  • g1-G1, g2-G2, and g3-G3 are substituted into the following formulas:
  • G a1 * (g * g) + b1 * g + c1;
  • g4-G4, g5-G5, and g6-G6 are substituted into the following formulas:
  • G a2 * (g * g) + b2 * g + c2;
  • this step includes:
  • the pixel is driven to emit light.
  • the grayscale voltage corresponding to a certain pixel is g7 (which can be obtained by analyzing the image content), and then determine the attributable grayscale voltage area of g7, for example, a low grayscale area, Obtain the actual grayscale voltage G7 corresponding to the theoretical grayscale voltage according to the grayscale compensation parameters a1, b1, c1 corresponding to the belonging grayscale voltage region, and finally drive the pixel to emit light based on the actual grayscale voltage G7 .
  • the method shown in FIG. 2 further includes the following steps:
  • the gamma curve required to provide the gray scale of the video signal is adjusted.
  • the step of adjusting the gamma curve required to provide the gray level of the video signal according to the brightness change of the display device environment includes:
  • the step of sensing the brightness change of the environment of the display device and outputting the brightness signal includes:
  • the light sensor senses the brightness change of the environment of the display device and outputs a light sensing signal
  • the light amplification processor performs optimization processing on the light sensing signal to obtain the brightness signal.
  • This embodiment provides a new gray-scale compensation method.
  • the method divides the gray-scale voltage into a plurality of different gray-scale voltage areas, configures different compensation rules for different areas, and obtains each test point through each area. Compensation parameters corresponding to each area, in the subsequent compensation, the corresponding compensation parameters will be determined according to the grayscale voltage that needs to be output, and then the compensated grayscale voltage is obtained based on the compensation parameters and the pixels are driven to emit light, so that the compensation effect and the actual
  • the gamma curve is closer to alleviate the technical problem of uneven pixel display in the existing display panel, improve the uniformity of the brightness of the screen, improve the display effect of the display, increase the product yield of the display device, and improve the user experience.
  • the display device includes: a display panel 31, a driving chip 32, a lighting module 33, a processor 34, and a memory 35, wherein:
  • the display panel 31 includes multiple pixels;
  • the driving chip 32 is used to drive the pixels in the display panel 31 to emit light
  • the lighting module 33 is used to collect the luminous brightness of the pixels
  • the processor 34 is used to determine a gamma curve of the display panel 31, and the gamma curve is a corresponding curve of the gray-scale voltage of the pixels in the display panel and the luminous brightness; according to the gamma curve, the gray The gray-scale voltage is divided into at least two gray-scale voltage zones, and the test points in each gray-scale voltage zone are determined; the gray-scale voltage corresponding to the test point is determined, the corresponding brightness value in the gamma curve; different gray-scales The gray scale compensation rules corresponding to the voltage area are different;
  • the processor 34 is further used to obtain the actual gray-scale voltage required when the pixel reaches the brightness value; according to the mapping relationship between the gray-scale voltage of the test point in each gray-scale voltage area and the actual gray-scale voltage, and the gray
  • the grayscale compensation rules of the grayscale voltage area, the grayscale compensation parameters corresponding to the grayscale voltage areas are obtained, and stored in the memory;
  • the driving chip 32 is further configured to drive the pixels in the display panel to emit light after compensating the gray-scale voltages of the pixels in the display panel according to the gray-scale compensation parameters corresponding to the gray-scale voltage region;
  • the memory 35 is used to store programs required to realize the functions of the processor, as well as the gray-scale voltage area corresponding to each pixel in the at least one gamma curve, the gray-scale compensation rule corresponding to each gray-scale voltage area, and the gray scale Compensation parameters.
  • the memory 35 is a flash memory, which can speed up data access speed.
  • each set of data includes a range of multiple gray-scale voltage regions, a gray corresponding to each gray-scale voltage region Order compensation rules and gray scale compensation parameters.
  • the lighting module includes a camera, such as a charge-coupled device (Charge-coupled Device, CCD) camera.
  • CCD Charge-coupled Device
  • the CCD camera is used to collect the display image of the OLED display panel, and the display brightness of each sub-pixel can be obtained , Improve the brightness adjustment accuracy.
  • This embodiment provides a display device that divides the gray-scale voltage into a plurality of different gray-scale voltage regions, configures different compensation rules for different regions, and can obtain the compensation parameters corresponding to each region through the test points in each region In the subsequent compensation, the corresponding compensation parameters will be determined according to the grayscale voltage that needs to be output, and then the compensated grayscale voltage is obtained based on the compensation parameters and the pixels are driven to emit light, so that the compensation effect is closer to the actual gamma curve, In order to alleviate the technical problem of uneven pixel display in the existing display panel, improve the brightness uniformity of the screen, improve the display effect of the display, increase the product yield of the display device, and improve the user experience.
  • the display device provided by the present application further includes a gamma curve adjustment module.
  • the gamma curve adjustment module is used to adjust the driving chip according to the brightness change of the surrounding environment of the liquid crystal display device Gamma curve required to provide the gray scale of the video signal (gamma curve), the display panel will display the video signal picture for viewing according to the gray scale of the video signal.
  • the gamma curve adjustment module includes an ambient light processing unit and a gamma curve adjuster, wherein the ambient light processing unit includes a light sensor and a light amplification processor; first, the light sensor senses The brightness of the display device environment changes, and the light sensing signal LSS is output accordingly. Next, the light amplification processor amplifies the light sensing signal LSS output by the light sensor by a gain value (this gain value should be based on actual conditions. Fixed), and after optimization processing such as noise filtering and distortion compensation, obtain and output the brightness signal IS to the gamma curve adjuster. After that, when the gamma curve adjuster receives the brightness signal IS, it searches for the gamma curve corresponding to the brightness signal IS according to the built-in lookup table.
  • the ambient light processing unit includes a light sensor and a light amplification processor
  • the light sensor senses The brightness of the display device environment changes, and the light sensing signal LSS is output accordingly.
  • the light amplification processor amplifies the light sensing
  • the ambient light processing unit senses the change in the brightness of the display device environment, and adjusts the gamma value of the gamma curve output by the gamma curve adjuster at any time, so whether the LCD display is in a bright environment or a dark room, it will The user feels that the resolution of the color brightness of the liquid crystal display is high, and the screen displayed by it becomes clearer.
  • the present application provides a new driving voltage compensation method, gray scale compensation method, and display device.
  • the method divides the driving voltage or gray scale voltage into a plurality of different driving voltage areas or gray scale voltage areas and other areas, which are different areas. Configure different compensation rules, and obtain the compensation parameters corresponding to each area through the test points in each area. In the subsequent compensation, the corresponding compensation parameters will be determined according to the required driving voltage or gray-scale voltage, and then based on the compensation parameters Obtain the compensated driving voltage or gray-scale voltage and drive the pixels to emit light, so that the compensation effect is closer to the actual gamma curve, to alleviate the technical problem of uneven pixel display in the existing display panel, and increase the product yield of the display device To improve user experience.

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Abstract

一种驱动电压补偿方法、灰阶补偿方法以及显示装置，驱动电压补偿方法将电压分为多个不同的区域，为不同的区域配置不同的补偿规则，通过各区域内的测试点可以得到每个区域对应的补偿参数，以使得补偿效果与实际的伽马曲线更接近，以缓解现有显示面板中像素显示不均匀的技术问题，增加显示设备的产品良率。

Description

驱动电压补偿方法、灰阶补偿方法以及显示装置 技术领域
本申请涉及显示技术领域，尤其涉及一种驱动电压补偿方法、灰阶补偿方法以及显示装置。
 背景技术
随着显示技术的发展，显示产品的显示效果不断地得到改善，从而使显示产品的应用越来越广泛。然而，现有的显示面板，由于制造工艺以及发光材料老化等原因容易造成像素之间发光不均匀，即不同像素在输入相同的图像信号（一般为灰阶电压）时，发光亮度不同，影响图像显示质量。
针对上述现象，现有技术利用伽马曲线对像素的驱动灰阶电压进行校正，具体的为：G=g+a，其中，G为补偿后的驱动灰阶电压，g为像素在下一帧图像内容中对应的灰阶电压，a为像素对应的固定补偿值（可以根据各种方式测试得到），该方式在一定程度上缓解了不同像素在输入相同的图像信号g时，发光亮度不同的问题。但是该补偿方式是采用线性补偿，而如图4所示，实际的伽马曲线并非都是线性变化的，因此现有的补偿方式并不能达到很好的补偿效果。
因此，如何对像素进行补偿以缓解显示面板显示不均匀，成为亟待解决的问题。
 技术问题
本申请提供一种驱动电压补偿方法、灰阶补偿方法以及显示装置，以缓解现有显示面板中像素显示不均匀的技术问题。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
本申请实施例提供了一种像素驱动电压补偿方法，其包含：
确定像素的伽马曲线，所述伽马曲线为像素的驱动电压与发光亮度的对应曲线；
根据所述伽马曲线，将所述驱动电压划分为至少两个驱动电压区，并确定各驱动电压区内的测试点；不同驱动电压区对应的驱动电压补偿规则不同；
确定所述测试点对应的驱动电压，在所述伽马曲线中对应的亮度值；
获取所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压；
根据各驱动电压区内测试点的驱动电压与实际驱动电压的映射关系、以及所述驱动电压区的驱动电压补偿规则，得到各驱动电压区对应的驱动电压补偿参数；
根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿。
在本申请一实施例中，所述根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿的步骤包括：
获取所述像素在下一帧图像内的驱动电压的归属驱动电压区；
根据所述归属驱动电压区对应的驱动电压补偿参数、以及所述像素在下一帧图像内的驱动电压，得到所述像素在下一帧图像内的实际驱动电压；
根据所述像素在下一帧图像内的实际驱动电压，驱动所述像素发光。
在本申请一实施例中，所述确定各驱动电压区内的测试点的步骤包括：
确定所述驱动电压区对应驱动电压补偿规则的补偿系数个数；
根据所述补偿系数个数确定所需要测试点的数量；
在所述驱动电压区内设置对应数量的测试点。
在本申请一实施例中，所述获取所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压的步骤包括：
逐渐增大所述像素的驱动电压，并实时采集所述像素的发光亮度；
在所述发光亮度达到所述亮度值时，将对应的驱动电压作为所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压。
在本申请一实施例中，所述根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿的步骤包括：
获取所述像素在下一帧图像内的驱动电压的归属驱动电压区；
根据所述归属驱动电压区对应的驱动电压补偿参数、以及所述像素在下一帧图像内的驱动电压，得到所述像素在下一帧图像内的实际驱动电压；
根据所述像素在下一帧图像内的实际驱动电压，驱动所述像素发光。
同时，本申请实施例还提供了一种显示面板灰阶补偿方法，其包括：
确定显示面板的伽马曲线，所述伽马曲线为所述显示面板中像素的灰阶电压与发光亮度的对应曲线；
根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区，并确定各灰阶电压区内的测试点；不同灰阶电压区对应的灰阶补偿规则不同；
确定所述测试点对应的灰阶电压，在所述伽马曲线中对应的亮度值；
获取所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压；
根据各灰阶电压区内测试点的灰阶电压与实际灰阶电压的映射关系、以及灰阶电压区的灰阶补偿规则，得到各灰阶电压区对应的灰阶补偿参数；
根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿。
在本申请一实施例中，所述根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿的步骤包括：
根据下一帧图像内容，确定所述像素在显示下一帧图像时的理论灰阶电压；
获取所述理论灰阶电压的归属灰阶电压区；
根据所述归属灰阶电压区对应的灰阶补偿参数，得到所述理论灰阶电压对应的实际灰阶电压；
基于所述实际灰阶电压，驱动所述像素发光。
在本申请一实施例中，所述确定各灰阶电压区内的测试点的步骤包括：
确定所述灰阶电压区对应灰阶补偿规则的补偿系数个数；
根据所述补偿系数个数确定所需要测试点的数量；
在所述灰阶电压区内设置对应数量的测试点。
在本申请一实施例中，所述根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区的步骤包括：
确定所述伽马曲线对应的灰阶电压与发光亮度的变化趋势；
根据所述变化趋势，将所述灰阶电压按照从小到大的顺序依次划分为第一灰阶电压区、第二灰阶电压区以及第三灰阶电压区。
在本申请一实施例中，所述第一灰阶电压区对应的灰阶补偿规则为二次函数，所述第二灰阶电压区对应的灰阶补偿规则为线性函数，所述第三灰阶电压区对应的灰阶补偿规则为二次函数。
在本申请一实施例中，所述根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿的步骤包括：
根据下一帧图像内容，确定所述像素在显示下一帧图像时的理论灰阶电压；
获取所述理论灰阶电压的归属灰阶电压区；
根据所述归属灰阶电压区对应的灰阶补偿参数，得到所述理论灰阶电压对应的实际灰阶电压；
基于所述实际灰阶电压，驱动所述像素发光。
在本申请一实施例中，所述获取所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压的步骤包括：
逐渐增大所述像素的灰阶电压，并实时采集所述像素的发光亮度；
在所述发光亮度达到所述亮度值时，将对应的灰阶电压作为所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压。
同时，本申请实施例还提供了一种显示装置，其包括显示面板、驱动芯片、采光模块、处理器以及存储器，其中：
所述处理器用于确定显示面板的伽马曲线，所述伽马曲线为所述显示面板中像素的灰阶电压与发光亮度的对应曲线；根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区，并确定各灰阶电压区内的测试点；确定所述测试点对应的灰阶电压，在所述伽马曲线中对应的亮度值；不同灰阶电压区对应的灰阶补偿规则不同；
所述采光模块用于采集所述像素的发光亮度；
所述驱动芯片用于驱动所述显示面板中像素发光；
所述处理器还用于获取所述像素达到所述亮度值时所需要的实际灰阶电压；根据各灰阶电压区内测试点的灰阶电压与实际灰阶电压的映射关系、以及灰阶电压区的灰阶补偿规则，得到各灰阶电压区对应的灰阶补偿参数，并存储至所述存储器；
所述驱动芯片还用于根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿后，驱动所述显示面板中像素发光；
所述存储器用于存在实现所述处理器功能所需的程序，以及在至少一个伽马曲线中各像素所对应的灰阶电压区、各灰阶电压区对应的灰阶补偿规则以及灰阶补偿参数。
在本申请一实施例中，所述采光模块包括相机。
在本申请一实施例中，所述相机包括电荷祸合器件相机。
在本申请一实施例中，所述存储器包括闪存。
在本申请一实施例中，所述存储器针对每一个像素，都存储有多组与伽马对应的数据，每组数据包括多个灰阶电压区的范围、各灰阶电压区对应的灰阶补偿规则以及灰阶补偿参数。
在本申请一实施例中，所述显示装置还包括伽马曲线调整模块，所述伽马曲线调整模块用于根据所述显示装置环境的亮度变化，而调整驱动芯片提供视频信号的灰阶所需的伽马曲线。
在本申请一实施例中，所述伽马曲线调整模块包括环境光处理单元和伽马曲线调整器，所述环境光处理单元用于感测所述显示装置环境的亮度变化，并输出亮度信号，所述伽马曲线调整器用于根据内建的查找表，查找得到所述亮度信号对应的伽马曲线。
在本申请一实施例中，所述环境光处理单元包括光感测器与光放大处理器，所述光感测器用于感测显示装置环境的亮度变化，输出光感测信号，所述光放大处理器用于对光感测信号进行优化处理，得到所述亮度信号。
 有益效果
本申请提供一种新的驱动电压补偿方法、灰阶补偿方法以及显示装置，该方法将驱动电压或者灰阶电压分为多个不同的驱动电压区或者灰阶电压区等区域，为不同的区域配置不同的补偿规则，通过各区域内的测试点可以得到每个区域对应的补偿参数，在后续进行补偿时，将根据需要输出的驱动电压或者灰阶电压确定对应的补偿参数，然后基于补偿参数得到补偿后的驱动电压或者灰阶电压并驱动像素发光，以使得补偿效果与实际的伽马曲线更接近，以缓解现有显示面板中像素显示不均匀的技术问题，增加显示设备的产品良率，提高用户使用体验。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的驱动电压补偿方法的流程图。
图2为本申请实施例提供的灰阶补偿方法的流程图。
图3为本申请实施例提供的显示装置的示意图。
图4为本申请实施例提供的伽马曲线的示意图。
图5为本申请实施例提供的灰阶电压划分示意图。
 本发明的实施方式
以下各实施例的说明是参考附加的图示，用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本申请，而非用以限制本申请。在图中，结构相似的单元是用以相同标号表示。
针对现有补偿方式是采用线性补偿，与实际的伽马曲线不符合所导致的补偿效果差的技术问题，本申请能够解决该缺陷。
如图1所示，本申请提供的像素驱动电压补偿方法包含以下步骤：
S101、确定像素的伽马曲线。
其中，所述伽马曲线为像素的驱动电压与发光亮度的对应曲线；伽马曲线的公式为：
Lx = Lz * Y；
其中，Y为（x/z）的幂函数，幂指数为γ，x为驱动电压，Lx为像素的驱动电压是x时对应的发光亮度，z为最大驱动电压，Lz为像素的驱动电压是最大驱动电压z时对应的发光亮度，γ为显示面板的目标伽马值。在一种实施例中，所述目标伽马值可以设置为2.2，也可以根据用户需求等进行设置，并不做具体限定。
如图4所示，其横轴表示视频信号灰阶(gray level)，而纵轴表示亮度(cd/m2)。于图4所揭示的4条阶调伽马曲线中，实线(—)的阶调伽马曲线的伽马值(gamma value)为2.2，虚线(--)的阶调伽马曲线的伽马值为1.3，而虚线(-.-)的阶调伽马曲线的伽马值为依据繁琐的实验所得的实验值(例如可以为2.0, 1. 8)，其中此实验值应视实际状况而定，故在此并不限制于此。
在一种实施例中，可依实际状况需求，而相对的增加或减少上述阶调伽马曲线的个数。
针对Lz可以通过以下方式得到：
首先，获取输入的驱动电压为z时，OLED显示面板各组红色子像素、绿色子像素和蓝色子像素的显示色度和显示亮度；
获取白色目标色度值和白色目标亮度值；
根据色度学公式计算所述OLED显示面板各组红色子像素、绿色子像素和蓝色子像素的驱动电压为z时的目标显示亮度。
具体的，一个红色子像素、一个蓝色子像素和一个绿色子像素组成一组子像素，即组成一个像素，根据色度学公式可以得到每一个像素内每一子像素的驱动电压为z时的目标显示亮度。本实施例根据白色目标色度值和白色目标亮度值，结合色度学公式计算各组红色子像素、绿色子像素和蓝色子像素的驱动电压为z时的目标显示亮度，在消除各子像素之间发光不均匀的同时，可以实现调节OLED显示面板的白平衡，消除OLED显示面板色偏。
不同显示装置，例如手机、显示屏、电视等，具备不同的伽马曲线；同一显示装置在不同场景下，例如不同光照（室内、室外等）也可以具备不同的伽马曲线，因此本步骤先确定一个伽马曲线。
S102、根据所述伽马曲线，将所述驱动电压划分为至少两个驱动电压区，并确定各驱动电压区内的测试点。
在一种实施例中，驱动电压区的数量可以无限多，这样在每个驱动电压区内，伽马曲线近似为线性，可以使得补偿效果更准确。
在一种实施例中，不同驱动电压区对应的驱动电压补偿规则不同。
在一种实施例中，为了降低计算量，简单的将驱动电压划分为3个区域，此时，本步骤中的根据所述伽马曲线，将所述驱动电压划分为至少两个驱动电压区包括：
确定所述伽马曲线对应的驱动电压与发光亮度的变化趋势；
根据所述变化趋势，将所述驱动电压按照从小到大的顺序依次划分为第一驱动电压区、第二驱动电压区以及第三驱动电压区。
在一种实施例中，第一驱动电压区对应的补偿规则为二次函数，所述第二驱动电压区对应的补偿规则为线性函数，所述第三驱动电压区对应的补偿规则为二次函数。
在一种实施例中，本步骤中的确定各驱动电压区内的测试点包括：
确定所述驱动电压区对应驱动电压补偿规则的补偿系数个数；
根据所述补偿系数个数确定所需要测试点的数量；
在所述驱动电压区内设置对应数量的测试点。
例如某驱动电压区对应驱动电压补偿规则为二次函数，例如：
G = a1*（g*g）+ b1*g + c1；
其中， G为补偿后的驱动电压，g为像素在下一帧图像内容中对应的驱动电压，a1、b1以及c1为补偿参数。
针对该区域，对应的补偿系数个数为3个，就可以在该区域内设置3个以及3个以上数量的测试点。在一种实施例中，测试点可以均匀的分布在驱动电压区内。
在一种实施例中，为了减少测试点的数量，加快计算速度，可以将驱动电压区的端点作为测试点，这样相邻的驱动电压区就可以共用这样的测试点。
S103、确定所述测试点对应的驱动电压，在所述伽马曲线中对应的亮度值。
本步骤可以基于伽马曲线测量得到，也可以根据伽马曲线对应的公式计算得到，不再赘述。
S104、获取所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压。
在一种实施例中，本步骤包括：
逐渐增大所述像素的驱动电压，并实时采集所述像素的发光亮度；
在所述发光亮度达到所述亮度值时，将对应的驱动电压作为所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压。
S105、根据各驱动电压区内测试点的驱动电压与实际驱动电压的映射关系、以及所述驱动电压区的驱动电压补偿规则，得到各驱动电压区对应的驱动电压补偿参数。
本步骤是常规的聚类和拟合，将在下文进行具体说明。
S106、根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿。
在一种实施例中，本步骤包括：
获取所述像素在下一帧图像内的驱动电压的归属驱动电压区；
根据所述归属驱动电压区对应的驱动电压补偿参数、以及所述像素在下一帧图像内的驱动电压，得到所述像素在下一帧图像内的实际驱动电压；
根据所述像素在下一帧图像内的实际驱动电压，驱动所述像素发光。
在一种实施例中，图1所示的方法还包括以下步骤：
根据所述显示装置环境的亮度变化，而调整提供视频信号的灰阶所需的伽马曲线。
在一种实施例中，所述根据所述显示装置环境的亮度变化，而调整提供视频信号的灰阶所需的伽马曲线的步骤包括：
感测所述显示装置环境的亮度变化，并输出亮度信号；
根据内建的查找表，查找得到所述亮度信号对应的伽马曲线。
在一种实施例中，所述感测所述显示装置环境的亮度变化，并输出亮度信号的步骤包括：
光感测器感测显示装置环境的亮度变化，输出光感测信号；
光放大处理器对光感测信号进行优化处理，得到所述亮度信号。
对应的，本申请实施例还提供了一种显示装置，其包括显示面板以及处理器，所述显示面板包括多个像素，所述处理器用于确定像素的伽马曲线，根据所述伽马曲线，将驱动电压划分为至少两个驱动电压区，并确定各驱动电压区内的测试点；确定所述测试点对应的驱动电压，在所述伽马曲线中对应的亮度值；获取所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压；根据各驱动电压区内测试点的驱动电压与实际驱动电压的映射关系、以及所述驱动电压区的驱动电压补偿规则，得到各驱动电压区对应的驱动电压补偿参数；根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿。
在一种实施例中，所述处理器具体用于：获取所述像素在下一帧图像内的驱动电压的归属驱动电压区；根据所述归属驱动电压区对应的驱动电压补偿参数、以及所述像素在下一帧图像内的驱动电压，得到所述像素在下一帧图像内的实际驱动电压；根据所述像素在下一帧图像内的实际驱动电压，驱动所述像素发光。
在一种实施例中，所述处理器具体用于：确定所述驱动电压区对应驱动电压补偿规则的补偿系数个数；根据所述补偿系数个数确定所需要测试点的数量；在所述驱动电压区内设置对应数量的测试点。
本申请提供一种新的驱动电压补偿方法以及显示装置，该方法将驱动电压分为多个不同的驱动电压区，为不同的区域配置不同的补偿规则，通过各区域内的测试点可以得到每个区域对应的补偿参数，在后续进行补偿时，将根据需要输出的驱动电压确定对应的补偿参数，然后基于补偿参数得到补偿后的驱动电压并驱动像素发光，以使得补偿效果与实际的伽马曲线更接近，以缓解现有显示面板中像素显示不均匀的技术问题，增加显示设备的产品良率，提高用户使用体验。
现以驱动电压为255灰阶、伽马为2.2为例进行说明，在一种实施例中，驱动电压可以为任意数量的灰阶，伽马为大于1的任意值。
如图2所示，本申请提供的显示面板灰阶补偿包含以下步骤：
S201、确定显示面板的伽马曲线。
所述伽马曲线为所述显示面板中像素的灰阶电压与发光亮度的对应曲线。
如图5所示，伽马曲线是伽马为2.2的曲线。
S202、根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区，并确定各灰阶电压区内的测试点。
不同灰阶电压区对应的灰阶补偿规则不同。
在一种实施例中，本步骤包括：确定所述伽马曲线对应的灰阶电压与发光亮度的变化趋势；根据所述变化趋势，将所述灰阶电压按照从小到大的顺序依次划分为第一灰阶电压区、第二灰阶电压区以及第三灰阶电压区。
在一种实施例中，所述第一灰阶电压区对应的灰阶补偿规则为二次函数，所述第二灰阶电压区对应的灰阶补偿规则为线性函数，所述第三灰阶电压区对应的灰阶补偿规则为二次函数。
在一种实施例中，本步骤包括：确定所述灰阶电压区对应灰阶补偿规则的补偿系数个数；根据所述补偿系数个数确定所需要测试点的数量；在所述灰阶电压区内设置对应数量的测试点。
如图5所示，将225阶的灰阶电压划分为低灰阶区（1至30灰阶，对应第一灰阶区）、中灰阶区（30至237灰阶，对应第二灰阶区）、以及高灰阶区（237至255灰阶，对应第三灰阶区）。
低灰阶区对应的灰阶补偿规则为：
G = a1*（g*g）+ b1*g + c1；
高灰阶区对应的灰阶补偿规则为：
G = a2*（g*g）+ b2*g + c2；
中灰阶区对应的灰阶补偿规则为：
G = a3*g + b3；
其中，G为补偿后的驱动电压，g为像素在下一帧图像内容中对应的驱动电压，a1、b1、c1、a2、b2、c2、a3以及b3为补偿参数。
同时，设置6个测试点x1、x2、x3、x4、x5以及x6，其中，x3对应的灰阶电压为g3=30，x4对应的灰阶电压为g4=237，x1对应的灰阶电压为g1、x2对应的灰阶电压为g2，均位于低灰阶区内，x5对应的灰阶电压为g5、x6对应的灰阶电压为g6均位于高灰阶区内。
S203、确定所述测试点对应的灰阶电压，在所述伽马曲线中对应的亮度值。
针对6个测试点，分别确定对应的亮度值。
例如测试点x1的灰阶电压g1对应L1、测试点x2的灰阶电压g2对应L2、测试点x3的灰阶电压g3对应L3、测试点x4的灰阶电压g4对应L4、测试点x5的灰阶电压g5对应L5、测试点x6的灰阶电压g6对应L6。
S204、获取所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压。
在一种实施例中，本步骤包括：
逐渐增大所述像素的灰阶电压，并实时采集所述像素的发光亮度；
在所述发光亮度达到所述亮度值时，将对应的灰阶电压作为所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压。
例如，像素的发光亮度达到L1时对应的实际灰阶电压为G1、发光亮度达到L2时对应的实际灰阶电压为G2、发光亮度达到L3时对应的实际灰阶电压为G3、发光亮度达到L4时对应的实际灰阶电压为G4、发光亮度达到L5时对应的实际灰阶电压为G5、发光亮度达到L6时对应的实际灰阶电压为G6。
S205、根据各灰阶电压区内测试点的灰阶电压与实际灰阶电压的映射关系、以及灰阶电压区的灰阶补偿规则，得到各灰阶电压区对应的灰阶补偿参数。
具体的，测试点x1的灰阶电压与实际灰阶电压的映射关系为g1-G1，测试点x2的灰阶电压与实际灰阶电压的映射关系为g2-G2，测试点x3的灰阶电压与实际灰阶电压的映射关系为g3-G3，测试点x4的灰阶电压与实际灰阶电压的映射关系为g4-G4，测试点x5的灰阶电压与实际灰阶电压的映射关系为g5-G5，测试点x6的灰阶电压与实际灰阶电压的映射关系为g6-G6。
针对低灰阶区，将g1-G1，g2-G2，以及g3-G3代入以下公式：
G = a1*（g*g）+ b1*g + c1；
可以计算得到a1、b1、c1；
针对高灰阶区，将g4-G4，g5-G5，以及g6-G6代入以下公式：
G = a2*（g*g）+ b2*g + c2；
可以计算得到a2、b2、c2；
针对中灰阶区，将g3-G3，以及g4-G4代入以下公式：
G = a3*g + b3；
可以计算得到a3以及b3。
S206、根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿。
在一种实施例中，本步骤包括：
根据下一帧图像内容，确定所述像素在显示下一帧图像时的理论灰阶电压；
获取所述理论灰阶电压的归属灰阶电压区；
根据所述归属灰阶电压区对应的灰阶补偿参数，得到所述理论灰阶电压对应的实际灰阶电压；
基于所述实际灰阶电压，驱动所述像素发光。
例如，显示装置在需要显示某一帧图像时，某一像素对应的灰阶电压为g7（解析图像内容即可得到），然后确定g7的归属灰阶电压区，例如为低灰阶区，然后根据所述归属灰阶电压区对应的灰阶补偿参数a1、b1、c1，得到所述理论灰阶电压对应的实际灰阶电压G7,最后基于所述实际灰阶电压G7，驱动所述像素发光。
在一种实施例中，图2所示的方法还包括以下步骤：
根据所述显示装置环境的亮度变化，而调整提供视频信号的灰阶所需的伽马曲线。
在一种实施例中，所述根据所述显示装置环境的亮度变化，而调整提供视频信号的灰阶所需的伽马曲线的步骤包括：
感测所述显示装置环境的亮度变化，并输出亮度信号；
根据内建的查找表，查找得到所述亮度信号对应的伽马曲线。
在一种实施例中，所述感测所述显示装置环境的亮度变化，并输出亮度信号的步骤包括：
光感测器感测显示装置环境的亮度变化，输出光感测信号；
光放大处理器对光感测信号进行优化处理，得到所述亮度信号。
本实施例提供一种新的灰阶补偿方法，该方法将灰阶电压分为多个不同的灰阶电压区，为不同的区域配置不同的补偿规则，通过各区域内的测试点可以得到每个区域对应的补偿参数，在后续进行补偿时，将根据需要输出的灰阶电压确定对应的补偿参数，然后基于补偿参数得到补偿后的灰阶电压并驱动像素发光，以使得补偿效果与实际的伽马曲线更接近，以缓解现有显示面板中像素显示不均匀的技术问题，提高屏幕的亮度均匀性，改善显示器的显示效果，增加显示设备的产品良率，提高用户使用体验。
如图3所示，本申请提供的显示装置包含：显示面板31、驱动芯片32、采光模块33、处理器34以及存储器35，其中：
所述显示面板31包括多个像素；
所述驱动芯片32用于驱动所述显示面板31中像素发光；
所述采光模块33用于采集所述像素的发光亮度；
所述处理器34用于确定显示面板31的伽马曲线，所述伽马曲线为所述显示面板中像素的灰阶电压与发光亮度的对应曲线；根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区，并确定各灰阶电压区内的测试点；确定所述测试点对应的灰阶电压，在所述伽马曲线中对应的亮度值；不同灰阶电压区对应的灰阶补偿规则不同；
所述处理器34还用于获取所述像素达到所述亮度值时所需要的实际灰阶电压；根据各灰阶电压区内测试点的灰阶电压与实际灰阶电压的映射关系、以及灰阶电压区的灰阶补偿规则，得到各灰阶电压区对应的灰阶补偿参数，并存储至所述存储器；
所述驱动芯片32还用于根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿后，驱动所述显示面板中像素发光；
所述存储器35用于存在实现所述处理器功能所需的程序，以及在至少一个伽马曲线中各像素所对应的灰阶电压区、各灰阶电压区对应的灰阶补偿规则以及灰阶补偿参数。
在一种实施例中，存储器35为闪存，可以加快数据存取速度。
在一种实施例中，在存储器35中，针对每一个像素，都存储有多组与伽马对应的数据，每组数据包括多个灰阶电压区的范围、各灰阶电压区对应的灰阶补偿规则以及灰阶补偿参数。
在一种实施例中，所述采光模块包括相机，如电荷祸合器件(Charge-coupled Device，CCD)相机，采用CCD相机采集OLED显示面板的显示图像，可以获取到每一个子像素的显示亮度，提高了亮度调节精度。
本实施例提供一种显示装置，将灰阶电压分为多个不同的灰阶电压区，为不同的区域配置不同的补偿规则，通过各区域内的测试点可以得到每个区域对应的补偿参数，在后续进行补偿时，将根据需要输出的灰阶电压确定对应的补偿参数，然后基于补偿参数得到补偿后的灰阶电压并驱动像素发光，以使得补偿效果与实际的伽马曲线更接近，以缓解现有显示面板中像素显示不均匀的技术问题，提高屏幕的亮度均匀性，改善显示器的显示效果，增加显示设备的产品良率，提高用户使用体验。
为了实现显示装置在不同场景下切换不同的伽马曲线，本申请提供的显示装置还包括伽马曲线调整模块，伽马曲线调整模块用于根据液晶显示装置周遭环境的亮度变化，而调整驱动芯片提供视频信号的灰阶所需的伽马曲线(gamma curve)，显示面板则会依据上述视频信号的灰阶而显示视频信号画面给使用者观看。
在一种实施例中，伽马曲线调整模块包括环境光处理单元、伽马曲线调整器，其中，环境光处理单元包括光感测器与光放大处理器；首先，由光感测器感测显示装置环境的亮度变化，而据以输出光感测信号LSS，紧接着，光放大处理器则将光感测器所输出的光感测信号LSS放大增益值(此增益值应视实际状况而定)、并对其做杂讯滤波及失真补偿等优化处理后，得到并输出亮度信号IS至伽马曲线调整器。之后，当伽马曲线调整器接收到亮度信号IS后，根据内建的查找表，查找得到亮度信号IS对应的伽马曲线。
本实施例通过环境光处理单元感测显示装置环境的亮度变化，而随时调整伽马曲线调整器所输出的伽马曲线的伽马值，故无论液晶显示器是处在光亮环境或暗室，皆会让使用者觉得液晶显示器的色彩亮度的解析度高，且其所显示的画面会变得较为清晰。
根据上述实施例可知：
本申请提供一种新的驱动电压补偿方法、灰阶补偿方法以及显示装置，该方法将驱动电压或者灰阶电压分为多个不同的驱动电压区或者灰阶电压区等区域，为不同的区域配置不同的补偿规则，通过各区域内的测试点可以得到每个区域对应的补偿参数，在后续进行补偿时，将根据需要输出的驱动电压或者灰阶电压确定对应的补偿参数，然后基于补偿参数得到补偿后的驱动电压或者灰阶电压并驱动像素发光，以使得补偿效果与实际的伽马曲线更接近，以缓解现有显示面板中像素显示不均匀的技术问题，增加显示设备的产品良率，提高用户使用体验。
综上所述，虽然本申请已以优选实施例揭露如上，但上述优选实施例并非用以限制本申请，本领域的普通技术人员，在不脱离本申请的精神和范围内，均可作各种更动与润饰，因此本申请的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种像素驱动电压补偿方法，其包含：
    确定像素的伽马曲线，所述伽马曲线为像素的驱动电压与发光亮度的对应曲线；
    根据所述伽马曲线，将所述驱动电压划分为至少两个驱动电压区，并确定各驱动电压区内的测试点；不同驱动电压区对应的驱动电压补偿规则不同；
    确定所述测试点对应的驱动电压，在所述伽马曲线中对应的亮度值；
    获取所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压；
    根据各驱动电压区内测试点的驱动电压与实际驱动电压的映射关系、以及所述驱动电压区的驱动电压补偿规则，得到各驱动电压区对应的驱动电压补偿参数；
    根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿。
  2. 根据权利要求1所述的像素驱动电压补偿方法，其中，所述根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿的步骤包括：
    获取所述像素在下一帧图像内的驱动电压的归属驱动电压区；
    根据所述归属驱动电压区对应的驱动电压补偿参数、以及所述像素在下一帧图像内的驱动电压，得到所述像素在下一帧图像内的实际驱动电压；
    根据所述像素在下一帧图像内的实际驱动电压，驱动所述像素发光。
  3. 根据权利要求1所述的像素驱动电压补偿方法，其中，所述确定各驱动电压区内的测试点的步骤包括：
    确定所述驱动电压区对应驱动电压补偿规则的补偿系数个数；
    根据所述补偿系数个数确定所需要测试点的数量；
    在所述驱动电压区内设置对应数量的测试点。
  4. 根据权利要求1所述的像素驱动电压补偿方法，其中，所述获取所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压的步骤包括：
    逐渐增大所述像素的驱动电压，并实时采集所述像素的发光亮度；
    在所述发光亮度达到所述亮度值时，将对应的驱动电压作为所述像素的发光亮度达到所述亮度值时所需要的实际驱动电压。
  5. 根据权利要求1所述的像素驱动电压补偿方法，其中，所述根据所述驱动电压区对应的驱动电压补偿参数，对所述像素的驱动电压进行补偿的步骤包括：
    获取所述像素在下一帧图像内的驱动电压的归属驱动电压区；
    根据所述归属驱动电压区对应的驱动电压补偿参数、以及所述像素在下一帧图像内的驱动电压，得到所述像素在下一帧图像内的实际驱动电压；
    根据所述像素在下一帧图像内的实际驱动电压，驱动所述像素发光。
  6. 一种显示面板灰阶补偿方法，其包括：
    确定显示面板的伽马曲线，所述伽马曲线为所述显示面板中像素的灰阶电压与发光亮度的对应曲线；
    根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区，并确定各灰阶电压区内的测试点；不同灰阶电压区对应的灰阶补偿规则不同；
    确定所述测试点对应的灰阶电压，在所述伽马曲线中对应的亮度值；
    获取所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压；
    根据各灰阶电压区内测试点的灰阶电压与实际灰阶电压的映射关系、以及灰阶电压区的灰阶补偿规则，得到各灰阶电压区对应的灰阶补偿参数；
    根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿。
  7. 根据权利要求6所述的显示面板灰阶补偿方法，其中，所述根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿的步骤包括：
    根据下一帧图像内容，确定所述像素在显示下一帧图像时的理论灰阶电压；
    获取所述理论灰阶电压的归属灰阶电压区；
    根据所述归属灰阶电压区对应的灰阶补偿参数，得到所述理论灰阶电压对应的实际灰阶电压；
    基于所述实际灰阶电压，驱动所述像素发光。
  8. 根据权利要求6所述的显示面板灰阶补偿方法，其中，所述确定各灰阶电压区内的测试点的步骤包括：
    确定所述灰阶电压区对应灰阶补偿规则的补偿系数个数；
    根据所述补偿系数个数确定所需要测试点的数量；
    在所述灰阶电压区内设置对应数量的测试点。
  9. 根据权利要求6所述的显示面板灰阶补偿方法，其中，所述根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区的步骤包括：
    确定所述伽马曲线对应的灰阶电压与发光亮度的变化趋势；
    根据所述变化趋势，将所述灰阶电压按照从小到大的顺序依次划分为第一灰阶电压区、第二灰阶电压区以及第三灰阶电压区。
  10. 根据权利要求9所述的显示面板灰阶补偿方法，其中，所述第一灰阶电压区对应的灰阶补偿规则为二次函数，所述第二灰阶电压区对应的灰阶补偿规则为线性函数，所述第三灰阶电压区对应的灰阶补偿规则为二次函数。
  11. 根据权利要求6所述的显示面板灰阶补偿方法，其中，所述根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿的步骤包括：
    根据下一帧图像内容，确定所述像素在显示下一帧图像时的理论灰阶电压；
    获取所述理论灰阶电压的归属灰阶电压区；
    根据所述归属灰阶电压区对应的灰阶补偿参数，得到所述理论灰阶电压对应的实际灰阶电压；
    基于所述实际灰阶电压，驱动所述像素发光。
  12. 根据权利要求6所述的显示面板灰阶补偿方法，其中，所述获取所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压的步骤包括：
    逐渐增大所述像素的灰阶电压，并实时采集所述像素的发光亮度；
    在所述发光亮度达到所述亮度值时，将对应的灰阶电压作为所述像素的发光亮度达到所述亮度值时所需要的实际灰阶电压。
  13. 一种显示装置，其包括显示面板、驱动芯片、采光模块、处理器以及存储器，其中：
    所述处理器用于确定显示面板的伽马曲线，所述伽马曲线为所述显示面板中像素的灰阶电压与发光亮度的对应曲线；根据所述伽马曲线，将所述灰阶电压划分为至少两个灰阶电压区，并确定各灰阶电压区内的测试点；确定所述测试点对应的灰阶电压，在所述伽马曲线中对应的亮度值；不同灰阶电压区对应的灰阶补偿规则不同；
    所述采光模块用于采集所述像素的发光亮度；
    所述驱动芯片用于驱动所述显示面板中像素发光；
    所述处理器还用于获取所述像素达到所述亮度值时所需要的实际灰阶电压；根据各灰阶电压区内测试点的灰阶电压与实际灰阶电压的映射关系、以及灰阶电压区的灰阶补偿规则，得到各灰阶电压区对应的灰阶补偿参数，并存储至所述存储器；
    所述驱动芯片还用于根据所述灰阶电压区对应的灰阶补偿参数，对所述显示面板中像素的灰阶电压进行补偿后，驱动所述显示面板中像素发光；
    所述存储器用于存储实现所述处理器功能所需的程序，以及在至少一个伽马曲线中各像素所对应的灰阶电压区、各灰阶电压区对应的灰阶补偿规则以及灰阶补偿参数。
  14. 根据权利要求13所述的显示装置，其中，所述采光模块包括相机。
  15. 根据权利要求13所述的显示装置，其中，所述相机包括电荷祸合器件相机。
  16. 根据权利要求13所述的显示装置，其中，所述存储器包括闪存。
  17. 根据权利要求16所述的显示装置，其中，所述存储器针对每一个像素，都存储有多组与伽马对应的数据，每组数据包括多个灰阶电压区的范围、各灰阶电压区对应的灰阶补偿规则以及灰阶补偿参数。
  18. 根据权利要求13所述的显示装置，其中，所述显示装置还包括伽马曲线调整模块，所述伽马曲线调整模块用于根据所述显示装置环境的亮度变化，而调整驱动芯片提供视频信号的灰阶所需的伽马曲线。
  19. 根据权利要求18所述的显示装置，其中，所述伽马曲线调整模块包括环境光处理单元和伽马曲线调整器，所述环境光处理单元用于感测所述显示装置环境的亮度变化，并输出亮度信号，所述伽马曲线调整器用于根据内建的查找表，查找得到所述亮度信号对应的伽马曲线。
  20. 根据权利要求19所述的显示装置，其中，所述环境光处理单元包括光感测器与光放大处理器，所述光感测器用于感测显示装置环境的亮度变化，输出光感测信号，所述光放大处理器用于对光感测信号进行优化处理，得到所述亮度信号。
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