WO2015180371A1 - 显示器件的亮度补偿方法、亮度补偿装置及显示器件 - Google Patents

显示器件的亮度补偿方法、亮度补偿装置及显示器件 Download PDF

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WO2015180371A1
WO2015180371A1 PCT/CN2014/088587 CN2014088587W WO2015180371A1 WO 2015180371 A1 WO2015180371 A1 WO 2015180371A1 CN 2014088587 W CN2014088587 W CN 2014088587W WO 2015180371 A1 WO2015180371 A1 WO 2015180371A1
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test
sub
value
pixel
grayscale
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PCT/CN2014/088587
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English (en)
French (fr)
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张向飞
吴仲远
周杨
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京东方科技集团股份有限公司
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Priority to EP14861162.7A priority Critical patent/EP3151229A4/en
Priority to US14/646,086 priority patent/US9704432B2/en
Publication of WO2015180371A1 publication Critical patent/WO2015180371A1/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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active 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
    • G09G3/2003—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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/141—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light conveying information used for selecting or modulating the light emitting or modulating element
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • Embodiments of the present invention relate to a brightness compensation method, a brightness compensation device, and a display device of a display device.
  • OLED display devices Under the current process conditions, organic light emitting diode (OLED) display devices have spatial and temporal non-uniformities, and as the size of display devices becomes larger, such problems become more apparent. Therefore, how to solve the display unevenness of a large-sized OLED display device has become one of important technologies.
  • the display unevenness of the OLED display device is closely related to the fabrication process. When the threshold voltage between the pixels of the entire display panel is largely different, the brightness uniformity of the entire display device is deteriorated.
  • organic materials also have a problem of constantly changing brightness during their own lifetime. Therefore, various compensation methods are needed to improve display unevenness.
  • the compensation method can be divided into two categories: internal compensation and external compensation.
  • Internal compensation refers to a method of compensating a sub-circuit built by a Thin Film Transistor (TFT) inside a pixel;
  • external compensation refers to extracting a TFT or OLED signal to the outside of the display panel, and then passing an external ASIC (Application Specific) Integrated Circuit (ASIC) method of compensation.
  • ASIC Application Specific
  • the internally compensated pixel structure and driving method are complicated; and in the display applications of large-size high-resolution and high-refresh frequency, the internal compensation method causes the aperture ratio to decrease and the driving speed to be slow.
  • External compensation has a simple pixel structure, faster drive speed and better compensation.
  • External compensation can be divided into optical extraction and electrical extraction according to different data extraction methods.
  • Optical extraction refers to extracting the brightness signal through an image sensor, such as an optical charge coupled device (CCD), and illuminating the display panel.
  • the electrical extraction method refers to the sensing circuit through the driving chip.
  • the electrical signals of the TFT and OLED are extracted. The two methods extract different types of signals, so the way data is processed is different. Now there is a need for a highly efficient method of brightness compensation.
  • Embodiments of the present invention provide a brightness compensation method, a brightness compensation device, and a display device of a display device, which can improve the efficiency of luminance information extraction of a display device in a process of improving brightness uniformity of a display device.
  • an embodiment of the present invention provides a brightness compensation method for a display device, including: acquiring an input grayscale value of one of a plurality of sub-pixels corresponding to the display device of an input image, and acquiring an image corresponding to the sub-pixel
  • the compensated grayscale value is a function of the input grayscale value; using the function relationship, the compensated grayscale value corresponding to the subpixel is obtained, and the compensated grayscale value is used according to the compensated grayscale value
  • the sub-pixels perform luminance compensation; then the above operations are repeatedly performed for each of the plurality of sub-pixels of the input image.
  • an embodiment of the present invention provides a brightness compensation device for a display device, including: an acquisition unit configured to acquire an input grayscale value of a current sub-pixel for each sub-pixel corresponding to the display device in the input image. And acquiring a compensated grayscale value corresponding to the subpixel as a function of the input grayscale value; the compensation unit configured to: for each subpixel corresponding to the display device in the input image And using the input grayscale value of the sub-pixel and the function relationship to obtain a compensated grayscale value corresponding to the sub-pixel, and performing luminance compensation on the sub-pixel according to the compensated grayscale value.
  • an embodiment of the present invention provides a display device including the above-described brightness compensation device.
  • FIG. 1 is a schematic diagram of an exemplary external optical compensation scheme
  • FIG. 2 is a schematic diagram of a method of calculating an exemplary external optical compensation
  • FIG. 3 is a schematic diagram showing a sub-pixel arrangement of a display device
  • FIG. 4 is a schematic diagram of a test brightness curve and a target brightness curve according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of determining a grayscale compensation amount such that a test luminance value reaches a target luminance value according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram showing a relationship between a compensated grayscale value and an input grayscale value according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a brightness compensation apparatus for a display device according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a display device including a brightness compensation device according to an embodiment of the present invention.
  • Embodiments of the present invention provide a brightness compensation method, a brightness compensation device, and a display device for a display device, which are used to improve the efficiency of luminance information extraction of a display device in a process of improving brightness uniformity of a display device.
  • FIG. 1 is a schematic diagram of an exemplary external optical compensation scheme, typically an CCD camera.
  • the method compares the brightness value obtained by photographing with the ideal value, and then selects the appropriate gray scale offset ⁇ G in a stepwise approximation manner, as shown in FIG. 2 .
  • the compensation accuracy of this method depends on the size of ⁇ G, the compensation range is (2 n -1) ⁇ G, and n is the number of measurements. Therefore, in order to improve the accuracy, it is necessary to reduce ⁇ G, and in order to expand the compensation range, only the number of measurements can be increased, and for each gray scale, multiple measurements and comparisons are required, and the efficiency is low. Therefore, how to achieve high efficiency external optical compensation in mass production has become one of the technical problems of large-size AMOLED productization.
  • the display device includes m rows and n columns of pixels, and the display device includes m ⁇ n pixels. Assuming each pixel includes three sub-pixels: a red pixel R, a green pixel G, and a blue pixel B, the display device can Includes m ⁇ n ⁇ 3 sub-pixels. For example, as shown in FIG. 3, for a display device of 5 rows and 5 columns, the display device includes 5 x 15 sub-pixels. When the input image of the display device is subjected to luminance compensation, luminance compensation is performed for each sub-pixel of the display device.
  • the functional relationship is determined for each sub-pixel of the display device according to the test luminance value and the target luminance value of the test pattern of the plurality of different test grayscale values of each of the sub-pixels.
  • the brightness compensation method provided by the embodiment of the present invention determines the compensated grayscale value and the test grayscale value corresponding to the subpixel according to the test luminance value and the target luminance value of each subpixel under a plurality of test patterns.
  • the function relationship that is, determining the compensated gray scale value corresponding to the sub-pixel as a function of the input gray scale value.
  • the function relationship corresponding to each sub-pixel is acquired, and for each sub-pixel in the input image, the sub-pixel is subjected to brightness compensation by using the functional relationship corresponding to the sub-pixel, and does not need to be used for each
  • the test pattern is measured a plurality of times, thereby improving the efficiency of the luminance information extraction of the display device in the process of improving the brightness uniformity of the display device.
  • the function relationship is determined according to the test brightness value and the target brightness value of the sub-pixel under a test pattern of a plurality of different gray-scale values, including:
  • the grayscale value is a function of the input grayscale value.
  • a polynomial fitting method or a gamma function fitting method may be employed.
  • the method further includes:
  • test brightness values under different test patterns are acquired by the image sensor.
  • 256 gray scale values are selected.
  • the partial grayscale value in the test is used as the test grayscale value.
  • six grayscale values may be selected as the test grayscale value, so that the efficiency of information extraction can be further improved due to the reduced information collected.
  • the image sensor may employ, for example, a CCD.
  • obtaining a functional relationship corresponding to the current sub-pixel includes:
  • the functional relationship corresponding to the current sub-pixel is obtained from the volatile memory.
  • obtaining a functional relationship corresponding to the current sub-pixel further includes:
  • the function relationship corresponding to the current sub-pixel is read from the non-volatile memory into the volatile memory before the function relationship corresponding to the current sub-pixel is obtained from the volatile memory.
  • the function relationship between the compensated gray scale value corresponding to the sub-pixel set in advance for each sub-pixel of the display device and the input gray-scale value is saved to a non-easy In the loss memory, the life of the stored data can be guaranteed; at the same time, when the display device is working normally, the function relationship is read from the non-volatile memory into the volatile memory, and in real time from the volatile memory. The function relationship is obtained to ensure the efficiency of real-time compensation.
  • the compensated gray scale value corresponding to any sub-pixel is a function of the input gray scale value, and conforms to the following formula:
  • G ij,x ' C ij,n G x n +C ij,n-1 G x n-1 +...+C ij,1 G x +C ij,0 ,
  • G ij,x ' is the compensated gray scale value corresponding to the sub-pixel of the i-th row and the j-th column
  • G x is the input gray scale value corresponding to the sub-pixel
  • C ij,n is the n-th development of G x
  • the coefficient of the term, the value of n is a natural number, and the values of i and j are positive integers.
  • the above formula is only an example of the function relationship between the compensated gray scale value corresponding to any sub-pixel and the input gray scale value, and the function relationship is not limited to the above formula.
  • the functional relationship can also be a gamma function relationship.
  • the brightness compensation method of the display device needs to determine, in advance, a function relationship between the compensated grayscale value corresponding to the sub-pixel and the input grayscale value for each sub-pixel of the display device.
  • the process of determining, for each sub-pixel of the display device, a compensated grayscale value corresponding to the input grayscale value for each sub-pixel is performed prior to shipment of the display device product.
  • a process of determining, in advance for each sub-pixel of the display device, a function of the compensated grayscale value corresponding to the input grayscale value for each sub-pixel is exemplified.
  • the display device supports 256 gray scales.
  • it is not limited to a display that supports 256 grayscales, for example, it can also be a 1024 grayscale display.
  • a display supporting 256 gray scales will be described as an example for better explanation of embodiments of the present invention.
  • determining, for each sub-pixel of the display device, a compensated gray-scale value corresponding to the sub-pixel and a function of the input gray-scale value including:
  • Step S401 Determine different test patterns according to the selected test grayscale values
  • Step S402 Acquire test brightness values under different test patterns collected by the image sensor
  • Step S403 determining, according to the plurality of test grayscale values and the test luminance values of the plurality of test grayscale values, a function relationship between the test luminance values of the subpixels and the test grayscale values;
  • Step S404 determining, according to the plurality of test grayscale values and the target luminance values of the plurality of test grayscale values, a function relationship between the target luminance values of the subpixels and the test grayscale values;
  • Step S405 According to the function relationship between the test brightness value and the test gray level value, and the target The relationship between the brightness value and the test gray scale value determines a gray scale compensation amount corresponding to each test gray scale value of the subpixel;
  • Step S406 determining, according to the grayscale compensation amount corresponding to each test grayscale value of the subpixel, a function relationship between the compensated grayscale value corresponding to the subpixel and the test grayscale value, that is, the corresponding corresponding to the subpixel
  • the compensated grayscale value is a function of the input grayscale value.
  • step S401 according to the response relationship between the brightness of the display device and the gray scale and the performance parameter of the image sensor, a part of the gray scale value is selected from the 256 gray scale values of the display device as the test gray scale value, for example, testing Gray scale values include G 1 , G 2 , G 3 ... G K .
  • different test patterns are determined based on the gray scale values, and the display panel display of the display device is controlled according to the determined test pattern. Determining the test pattern according to the test gray scale value and controlling the display panel display of the display device according to the test pattern all adopt techniques known to the inventors, and details are not described herein again.
  • step S402 a test brightness value under the test pattern acquired by the image sensor is acquired, for example, a test brightness value of each sub-pixel under the test gray scale value acquired by the CCD is acquired.
  • an array of test luminance values can be obtained under different test grayscale values, for example, for the sub-pixels of the first row and the first column, Obtain an array with the number of items K: (L 11,1 , L 11,2 ... L 11,k ), the array corresponding to the sub-pixels of the i-th row and the j-th column is: (L ij,1 , L ij, 2 ...
  • L ij,k L11,k is the test luminance value of the sub-pixel of the first row and the first column when the gray scale value is G k
  • L ij,k is the i-th row and the j-th column sub-pixel luminance values of the test value in the test gray level G k. Therefore, for the display device, i x j arrays can be obtained.
  • determining the target brightness value two methods can be used: one is to preset the target brightness value under the test gray level value, and the other is to test the gray level value for each test brightness value. average value.
  • averaging all the test brightness values to obtain the target brightness value for example, the following formula can be used:
  • L k is the target luminance value when the gray scale value is G K
  • the test gray scale value of G K the test luminance values of all sub-pixels (i ⁇ j sub-pixels) of the display device are averaged to obtain The target brightness value L K under the gray scale value is tested.
  • a test luminance value of the sub-pixel is determined as a function of the test grayscale value according to the plurality of test grayscale values and the test luminance values of the plurality of test grayscale values. For example, a least squares principle may be used, and for each sub-pixel, a polynomial fit is performed on a plurality of test gray scale values corresponding to the sub-pixel and an array of test luminance values under the plurality of test gray scale values to obtain the sub-pixel.
  • the relationship between the test brightness value of the pixel and the test gray level value may be the following polynomial:
  • L ij,x is the test luminance value corresponding to the test gray scale value G x of the sub-pixel of the i-th row and the j-th column
  • the G x value is [0, 255]
  • a ij , n is the coefficient of the n-th expansion term of G x
  • the value of n is a natural number. That is to say, in the embodiment of the present invention, it is not necessary to test all the grayscale values supported by the display device, and only a part of the grayscale values need to be selected as the test grayscale value to obtain the test luminance value.
  • test gray scale values For each sub-pixel, a plurality of sets of test gray scale values and an array of test luminance values are fitted to obtain a function relationship between the test luminance values and the test gray scale values.
  • fitting method no matter what kind of fitting method is adopted, as long as the test brightness value obtained by the function relationship between the test brightness value and the test gray level value can maximize the brightness value actually tested for each test gray scale value. In this way, a large amount of test time can be saved, and the overall efficiency of the brightness compensation is improved.
  • a target luminance value of the sub-pixel is determined as a function of the test grayscale value according to the plurality of test grayscale values and the target luminance values of the plurality of test grayscale values.
  • polynomial fitting may be performed on the array of the plurality of test gray scale values and the target brightness values of the plurality of test gray scale values by using a least squares principle. Obtain a function relationship between the target brightness value and the test gray level value, for example, the following polynomial:
  • L t,x is the target luminance value corresponding to the input grayscale value G x .
  • G x takes the value [0, 255]
  • B t,n is the n expansion of G x .
  • the coefficient of n, the value of n is a natural number.
  • step S405 determining a gray scale compensation corresponding to each test grayscale value of the subpixel according to a function relationship between the test luminance value and the test grayscale value and a function relationship between the target luminance value and the test grayscale value. the amount.
  • test brightness value is a function of the test gray scale value
  • L ij,x A ij,n G x n +A ij,n-1 G x n-1 +...+A ij,1 G x +A ij,0 .
  • the target luminance value is a function of the input grayscale value
  • the following formula is met.
  • the step is explained by taking the function relationship between the test brightness value and the test gray scale value, the relationship between the target brightness value and the test gray scale value respectively satisfying the above formula as an example.
  • test luminance value and the target luminance value pair test grayscale value as shown in FIG. 4 can be obtained.
  • the test brightness curve 1 and the test brightness curve 2 are respectively a curve of the test brightness value and the test gray level value of the arbitrarily selected first sub-pixel and the second sub-pixel for exemplification.
  • Gk is the selected grayscale value.
  • the first sub-pixel has a test luminance value L 1k at the test gray scale value
  • the second sub-pixel has a test luminance value L 2k at the test gray scale value
  • G 1k ' is the first sub-pixel to reach the target the new grayscale value of the luminance value L k
  • G 2k ' is the second sub-pixel to a new gray level value of the target luminance value L k
  • ⁇ G 1k first subpixel gray level compensation amount reaches the target luminance value L k of ⁇ G 2k is the gray scale compensation amount at which the second sub-pixel reaches the target luminance value L k .
  • Gmax denotes a maximum gray level value of the display device
  • L 1k ' indicates the luminance curve G 1k Test 1' corresponding to the luminance value test
  • L 2k ' represents G 2k test brightness curve 2' corresponding to the luminance value of the test
  • L 1k 'and The value of L 2k ' is equal to the value of L 1k .
  • the compensated grayscale value corresponding to the sub-pixel is determined as a function of the test grayscale value according to the grayscale compensation amount corresponding to each test grayscale value of the subpixel.
  • a polynomial fitting is performed for a plurality of grayscale compensation amounts of each subpixel, and the compensated grayscale value Gij is obtained.
  • a polynomial of x ' with a gray scale value G ij,x conforms to the following formula:
  • G ij,x ' C ij,n G x n +C ij,n-1 G x n-1 +...+C ij,1 G x +C ij,0 ;
  • G ij,x ' is the compensated gray scale value corresponding to the sub-pixel of the i-th row and the j-th column
  • G x is the input gray scale value corresponding to the sub-pixel
  • C ij,n is the n-th development of G x
  • the coefficient of the term, the value of n is a natural number, and the values of i and j are positive integers. More intuitively, according to the formula , the relationship between the compensated grayscale value G ij,x ' and the input grayscale value G x as shown in FIG. 6 can be obtained, from the relationship graph shown in FIG. The correspondence between the compensated grayscale value and the input grayscale value can be understood more intuitively.
  • the compensated gray-scale value G ij,x ' and the polynomial of the input gray-scale value G ij,x are used as a function of the compensated gray-scale value corresponding to the input gray-scale value of the sub-pixel, Taking the data size of each coefficient in the polynomial as 8 bits as an example, for a display device including i ⁇ j sub-pixels, the data size of these coefficients is i ⁇ j ⁇ (n+1) ⁇ 8 bits. Taking the display device including 3840*2160 pixels as an example, the data size of the coefficient is 3840*2160*3*(n+1)*8 bits, so the size of the n value determines the complexity of the algorithm, and the compensation effect is guaranteed. Under the condition, selecting a smaller value of n can save more resources. Therefore, the value of n is generally not more than 3, that is, the highest power of G x is 3, so that all data sizes are less than 1 Gbit.
  • the functional relationship is saved to the memory of the display device.
  • the volatile memory reads data at a high speed. Therefore, when the function relationship is saved in the memory of the display device, the function relationship is saved to the display.
  • Non-volatile memory for the device since the data storage life of the nonvolatile memory is long, the volatile memory reads data at a high speed. Therefore, when the function relationship is saved in the memory of the display device, the function relationship is saved to the display.
  • the function relationship between the compensated grayscale value corresponding to each sub-pixel and the input grayscale value is first read from the non-volatile memory into the volatile memory, and then from the volatile memory.
  • the function relationship between the compensated grayscale value corresponding to each sub-pixel and the input grayscale value is obtained in real time, so that the brightness compensation can be performed in real time, and finally the brightness uniformity of the display device is improved.
  • the method of compensating for the brightness of the display device when the display device is operating normally is as follows:
  • Step S801 Acquire an input grayscale value of the current sub-pixel and a function relationship corresponding to the current sub-pixel; the function relationship is a test for a plurality of different grayscale values according to the sub-pixel for each sub-pixel of the display device in advance. The test brightness value and the target brightness value under the pattern are determined, and the function relationship is a correspondence relationship between the compensated gray level value corresponding to the sub-pixel and the input gray level value;
  • Step S802 Using the input grayscale value of the sub-pixel and the corresponding function relationship, obtaining the compensated grayscale value corresponding to the sub-pixel, and performing luminance compensation on the sub-pixel according to the compensated grayscale value.
  • the brightness compensation method provided by the embodiment of the present invention preliminarily sets the compensated grayscale value and the input grayscale value corresponding to the subpixel according to the test luminance value and the target luminance value of each subpixel under a plurality of test patterns.
  • a function relationship when the display device is normally displayed, acquiring a function relationship corresponding to each sub-pixel, and using the functional relationship corresponding to the sub-pixel for the input gray-scale value of each sub-pixel in the input image Brightness compensation, no need to make multiple measurements for each test pattern, thereby improving the brightness of the display device in the process of improving the brightness uniformity of the display device The efficiency of information extraction.
  • the lifetime of the stored data can be ensured;
  • the function relationship is read from the non-volatile memory into the volatile memory, and the function relationship is obtained from the volatile memory in real time, thereby ensuring real-time compensation. effectiveness.
  • the brightness compensation method of the display device provided by the embodiment of the present invention is described in detail below.
  • the brightness compensation device of the display device provided by the embodiment of the present invention will be described below with reference to the accompanying drawings.
  • the brightness compensation device of the display device includes:
  • the acquiring unit Z91 is configured to: acquire, for each sub-pixel corresponding to the display device in the input image, an input grayscale value of the current sub-pixel and a function relationship corresponding to the current sub-pixel; the function relationship is pre-targeted to the display device
  • Each of the sub-pixels is determined according to the test luminance value and the target luminance value of the sub-pixel under a plurality of different grayscale value test patterns, and the functional relationship is the compensated grayscale value corresponding to the sub-pixel and Enter the correspondence of the grayscale values;
  • the compensation unit Z92 is configured to: for each sub-pixel corresponding to the display device in the input image, use the input grayscale value of the sub-pixel and the corresponding function relationship to obtain the compensated grayscale corresponding to the sub-pixel The value is used to perform brightness compensation on the sub-pixel according to the compensated gray-scale value.
  • the above brightness compensation device may be a control module of a display device.
  • the acquisition unit and the compensation unit can each be implemented, for example, by a processor.
  • the brightness compensation device preliminarily sets the compensated grayscale value and the input grayscale value corresponding to the subpixel according to the test luminance value and the target luminance value of each subpixel under a plurality of test patterns.
  • the function relationship is: when the display device is normally displayed, acquiring a function relationship corresponding to each sub-pixel, and performing, for each sub-pixel in the input image, the brightness compensation of the sub-pixel by using the functional relationship corresponding to the sub-pixel, without Multiple measurements are made for each test pattern, thereby improving the efficiency of luminance information extraction of the display device in the process of improving the brightness uniformity of the display device.
  • the brightness compensation device may further include:
  • Preset unit constructed as:
  • the grayscale value is a function of the input grayscale value.
  • the preset unit may be disposed inside the display device or may be independent of the display device.
  • the preset unit is a data processor that is independent of the display device.
  • the preset unit may also be configured as:
  • 256 gray scale values are selected.
  • the partial grayscale value in the test is used as the test grayscale value.
  • six grayscale values can be selected as the test grayscale value, so that the efficiency of information extraction can be further improved.
  • the acquisition unit is configured to acquire a functional relationship corresponding to a current sub-pixel from a volatile memory.
  • the obtaining unit may also be configured as:
  • the function relationship corresponding to the current sub-pixel is read from the non-volatile memory into the volatile memory before the function relationship corresponding to the current sub-pixel is obtained from the volatile memory.
  • the function relationship between the compensated gray scale value corresponding to the sub-pixel set in advance for each sub-pixel of the display device and the input gray-scale value is saved to a non-easy In the loss memory, the life of the stored data can be guaranteed; at the same time, when the display device is working normally, the function relationship is read from the non-volatile memory into the volatile memory, and in real time from the volatile memory. The function relationship is obtained to ensure the efficiency of real-time compensation.
  • the compensated gray scale value corresponding to any sub-pixel is a function of the input gray scale value, and conforms to the following formula:
  • G ij,x ' C ij,n G x n +C ij,n-1 G x n-1 +...+C ij,1 G x +C ij,0 ;
  • G ij,x ' is the compensated gray scale value corresponding to the sub-pixel of the i-th row and the j-th column
  • G x is the input gray scale value corresponding to the sub-pixel
  • C ij,n is the n-th development of G x
  • the coefficient of the term, the value of n is a natural number, and the values of i and j are positive integers.
  • Embodiments of the present invention also provide a display device including the above-described brightness compensation device.
  • the display device may be: a liquid crystal panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like, or any product or component having a display function.
  • the preset unit is a data processor independent of the display device
  • the brightness compensation device is a control module of the display device.
  • the test luminance value of the pixel under the test pattern is acquired by the image sensor Z103.
  • the display device Z101 includes a display panel Z1011 and a control module Z1012 that controls display of the display panel.
  • control module Z1012 includes a control module Z10120, a non-volatile memory Z10121, a volatile memory Z10122, and an interface module.
  • control module Z10120 includes:
  • An acquiring unit configured to: obtain, for each sub-pixel corresponding to the display device in the input image, an input grayscale value of the current sub-pixel, and a function relationship corresponding to the current sub-pixel; The number relationship is: for each sub-pixel of the display device, the compensated gray corresponding to the sub-pixel is determined according to the test brightness value and the target brightness value of the sub-pixel under the test pattern of the plurality of different gray-scale values. The correspondence between the order value and the input gray scale value;
  • the compensation unit is configured to: for each sub-pixel corresponding to the display device in the input image, use the input gray-scale value of the sub-pixel and the corresponding function relationship to obtain the compensated gray-scale value corresponding to the sub-pixel And performing brightness compensation on the sub-pixel according to the compensated gray-scale value;
  • Both the non-volatile memory Z10121 and the volatile memory Z10122 are used to store the compensated grayscale value corresponding to the sub-pixel set in advance for each sub-pixel of the display device as a function of the input grayscale value.
  • the non-volatile memory Z10121 is configured to store the compensated grayscale value corresponding to the sub-pixel set in advance for each sub-pixel of the display device sent by the data processor Z102 as a function of the input gray-scale value, and is volatile.
  • the memory Z10122 is configured to store, by the control module, the compensated grayscale value corresponding to the sub-pixel set in advance for each sub-pixel of the display device read from the non-volatile memory Z10121 as a function of the input grayscale value; as well as
  • An interface module for receiving an input test pattern during the test phase for receiving an input image when the display is normally displayed. This module uses the technology known to the inventors and will not be described again.
  • the display panel Z1011 may be an AMOLED or a liquid crystal display panel, which is not limited herein.
  • the data processor Z102 is configured to: after selecting a partial grayscale value from all grayscale values of the display device as a test grayscale value, and determining a test pattern according to the selected test grayscale value, obtaining the pass
  • the image sensor collects test brightness values under different test patterns
  • the grayscale value is a function of the input grayscale value.
  • the brightness compensation method, the brightness compensation device, and the display device of the display device determine the test brightness value and the target brightness value of each sub-pixel under a plurality of test patterns in advance.
  • the functional relationship between the compensated grayscale value corresponding to the subpixel and the input grayscale value, and the function relationship corresponding to each subpixel is obtained for each subpixel corresponding to the display device in the input image when the display device is normally displayed.
  • using the functional relationship corresponding to the sub-pixel to perform brightness compensation on the sub-pixel, and does not need to measure for each gray-scale value of the display device, thereby improving the display in the process of improving brightness uniformity of the display device.
  • the lifetime of the stored data can be ensured;
  • the function relationship is read from the non-volatile memory into the volatile memory, and the function relationship is obtained from the volatile memory in real time, thereby ensuring real-time compensation. effectiveness.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种显示器件（Z101）的亮度补偿方法、亮度补偿装置及显示器件（Z101）。显示器件（Z101）的亮度补偿方法，包括：获取输入图像的与显示器件（Z101）相对应的多个子像素之一的输入灰阶值以及与子像素对应的补偿后的灰阶值与输入灰阶值的函数关系；利用函数关系，得到与子像素对应的补偿后的灰阶值，根据补偿后的灰阶值对子像素进行亮度补偿；然后针对输入图像的多个子像素中每个重复执行以上操作。亮度补偿方法、亮度补偿装置及显示器件（Z101）能够在提高显示器件（Z101）亮度均匀性的过程中，提高对显示器件（Z101）亮度信息抽取的效率。

Description

显示器件的亮度补偿方法、亮度补偿装置及显示器件 技术领域
本发明的实施例涉及一种显示器件的亮度补偿方法、亮度补偿装置及显示器件。
背景技术
在目前工艺条件下，有机电致发光二极管(Organic Light Emitting Diode，OLED)显示器件存在空间上和时间上的不均匀性，并且随着显示器件尺寸的变大，此类问题暴露的愈发明显，因此如何解决大尺寸OLED显示器件的显示不均匀性成为重要技术之一。OLED显示器件的显示不均匀性与制作工艺紧密相关，当整个显示面板的像素之间的阈值电压有较大的差异时，显示器件整体的亮度均匀性变差。而且，有机材料在其自身的寿命期间也存在亮度不断变化的问题。因此需要各种补偿方法来改善显示不均匀性。
补偿方法可以分为内部补偿和外部补偿两大类。内部补偿是指在像素内部利用薄膜晶体管(Thin Film Transistor，TFT)构建的子电路进行补偿的方法；外部补偿是指将TFT或OLED信号抽取到显示面板外部，再通过外部专用集成电路(Application Specific Integrated Circuit，ASIC)进行补偿的方法。通常内部补偿的像素结构和驱动方式都较复杂；而且在大尺寸高分辨率和高刷新频率的显示应用中，内部补偿的方式会导致开口率降低、驱动速度变慢。而外部补偿则具有简单的像素结构，较快的驱动速度和较好的补偿效果。
外部补偿根据数据抽取方法的不同又可以分为光学抽取式和电学抽取式。光学抽取式是指将显示面板点亮后通过图像传感器，例如，光学电荷耦合器件(Charge Coupled Device，CCD)，照相的方法将亮度信号抽取出来，电学抽取式是指通过驱动芯片的感应电路将TFT和OLED的电学信号抽取出来。两种方法抽取的信号种类不同，因此数据处理的方式也不同。而现在需要一种高效率的亮度补偿方法。
发明内容
本发明的实施例提供了一种显示器件的亮度补偿方法、亮度补偿装置及显示器件，能够在提高显示器件亮度均匀性的过程中，提高对显示器件亮度信息抽取的效率。
一方面，本发明的实施例提供一种显示器件的亮度补偿方法，包括：获取输入图像的与所述显示器件相对应的多个子像素之一的输入灰阶值以及获取与所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系；利用所述函数关系，得到与所述子像素对应的补偿后的灰阶值，根据所述补偿后的灰阶值对所述子像素进行亮度补偿；然后针对所述输入图像的多个子像素中每个重复执行以上操作。
另一方面，本发明的实施例提供一种显示器件的亮度补偿装置，包括：获取单元，构造为：针对输入图像中与显示器件相对应的每个子像素，获取当前子像素的输入灰阶值以及获取与所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系；补偿单元，构造为：针对所述输入图像中与所述显示器件相对应的每一子像素，利用该子像素的所述输入灰阶值和所述函数关系，得到该子像素对应的补偿后的灰阶值，根据补偿后的灰阶值对该子像素进行亮度补偿。
再一方面，本发明实施例提供一种显示器件，包括上述的亮度补偿装置。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1为一种示例性外部光学补偿方案的原理图；
图2为一种示例性外部光学补偿的计算方法的示意图；
图3为显示器件的子像素排列方式示意图；
图4为根据本发明实施例的测试亮度曲线与目标亮度曲线的示意图；
图5为根据本发明实施例的确定使得测试亮度值达到目标亮度值的灰阶补偿量的示意图；
图6为根据本发明实施例的补偿后的灰阶值与输入灰阶值的关系曲线示意图；
图7为本发明实施例提供的显示器件的亮度补偿装置的结构示意图；以及
图8为本发明实施例提供的包括亮度补偿装置的显示器件的结构框图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供了一种显示器件的亮度补偿方法、亮度补偿装置及显示器件，用以在提高显示器件亮度均匀性的过程中，提高了对显示器件亮度信息抽取的效率。
图1是一种示例性外部光学补偿方案的原理图，图像传感器通常是CCD照相机。该方法通过将照相所得到的亮度值与理想值做比较，然后选取恰当的灰阶偏移量ΔG采用逐步逼近的方式来进行，如图2所示。这种方法的补偿精度取决于ΔG的大小，补偿范围为(2n-1)ΔG，n为测量次数。因此为了提高精度，需要减小ΔG，而为了扩大补偿范围，只能增加测量次数，而且对每一种灰阶，都需进行多次测量和比较，效率很低。因此，如何实现量产中高效率的外部光学补偿成为大尺寸AMOLED产品化的技术问题之一。
下面将结合附图，对本发明实施例的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
一般的，显示器件包括m行n列像素，则该显示器件包括m×n个像素，假定每个像素包括三个子像素：红色像素R、绿色像素G和蓝色像素B，则该显示器件可以包括m×n×3个子像素。例如，如图3所示，对于一个5行5列的显示器件，该显示器件包括5×15个子像素。在对显示器件的输入图像进行亮度补偿时，是针对显示器件的每一个子像素为单位进行亮度补偿的。
本发明实施例提供的一种显示器件的亮度补偿方法，包括：
获取输入图像的与所述显示器件相对应的多个子像素之一的输入灰阶值以及与所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系；
利用所述函数关系，得到与所述子像素对应的补偿后的灰阶值，根据所述补偿后的灰阶值对所述子像素进行亮度补偿；
然后针对所述输入图像的多个子像素中每个重复执行以上操作。
而且，其中所述函数关系是针对所述显示器件的每个子像素、根据所述每个子像素在多个不同测试灰阶值的测试图案下的测试亮度值和目标亮度值确定出来的。
本发明实施例提供的上述亮度补偿方法，预先根据每一子像素在多个测试图案下的测试亮度值和目标亮度值，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系，也就是，确定该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系。在显示器件正常显示时，获取每一子像素对应的函数关系，针对输入图像中的每一子像素，利用该子像素对应的所述函数关系对该子像素进行亮度补偿，不需要针对每一测试图案进行多次测量，从而在提高显示器件亮度均匀性的过程中，提高了对显示器件亮度信息抽取的效率。
示例性地，预先针对每一子像素，根据该子像素在多个不同灰阶值的测试图案下的测试亮度值和目标亮度值，确定出所述函数关系，包括：
对于每一子像素，
根据多个测试灰阶值和该多个测试灰阶值下的多个测试亮度值，确定该子像素的测试亮度值与测试灰阶值的函数关系；
根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮度值与测试灰阶值的函数关系；
根据所述测试亮度值与测试灰阶值的函数关系以及所述目标亮度值与测试灰阶值的函数关系，确定该子像素的每一测试灰阶值对应的灰阶补偿量；
根据该子像素的每一测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系，也就是，所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系。
在本发明实施例中，根据多个测试灰阶值和该多个测试灰阶值下的测试亮度值，确定该子像素的测试亮度值与测试灰阶值的函数关系；以及根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮 度值与测试灰阶值的函数关系；以及根据所述测试亮度值与测试灰阶值的函数关系以及所述目标亮度值与测试灰阶值的函数关系，确定该子像素的每一测试灰阶值对应的灰阶补偿量；以及根据该子像素的每一测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系；在确定函数关系时，例如，均可以采用多项式拟合的方法或伽马函数拟合的方法。
示例性地，针对每一子像素，根据该子像素在多个不同灰阶值的测试图案下的测试亮度值和目标亮度值，确定出所述函数关系之前，还包括：
从所述显示器件的所有灰阶值中选取部分灰阶值作为多个测试灰阶值；
根据选取的测试灰阶值确定不同的测试图案；
通过图像传感器采集不同测试图案下的测试亮度值。
例如，以显示器件支持256个灰阶显示为例，在实际测试中，针对不同的测试需要，根据该显示器件的亮度与灰阶的响应关系和图像传感器的性能参数，选取256个灰阶值中的部分灰阶值作为测试灰阶值，例如，可以选6个灰阶值作为测试灰阶值，如此，由于采集的信息减少可以进一步提高信息抽取的效率。当然，也可以将256个灰阶值中的每一灰阶值对应的测试图案都进行测试。通过图像传感器采集所述测试灰阶值下的测试亮度值时，该图像传感器可以采用例如CCD。
示例性地，获取与当前子像素对应的函数关系，包括：
从易失性存储器中获取与当前子像素对应的函数关系。
由于从易失性存储器中读取数据的速度较快，因此在显示器件实时显示画面时，能够快速的对输入图像在显示面板上的每一子像素进行亮度补偿。
示例性地，获取与当前子像素对应的函数关系，还包括：
在从易失性存储器中获取与当前子像素对应的函数关系之前，将与当前子像素对应的函数关系从非易失性存储器中读取到易失性存储器中。
由于易失性存储器保存数据的时间较短，因此，通过将预先针对显示器件的每一子像素设置的该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系保存到非易失性存储器中，能够保证存储数据的寿命；同时，在显示器件正常工作时，将所述函数关系从非易失性存储器中读取到易失性存储器中，并实时从易失性存储器中获取所述函数关系，从而保证了实时补偿的效率。
示例性地，任一子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，符合如下公式：
Gij,x＇＝Cij,nGx n+Cij,n-1Gx n-1+…+Cij,1Gx+Cij,0，
其中，Gij,x＇为第i行第j列的子像素对应的补偿后的灰阶值，Gx为该子像素对应的输入灰阶值，Cij,n为Gx的n次展开项的系数，n的取值为自然数，i、j的取值为正整数。
需要说明的是，以上公式仅是任一子像素对应的补偿后的灰阶值与输入灰阶值的函数关系的一种示例，该函数关系不限制于上述公式。例如，函数关系也可以是伽马函数关系。
下面结合附图，对本发明实施例提供的显示器件的亮度补偿方法进行说明。
本发明实施例提供的显示器件的亮度补偿方法，需要预先针对显示器件的每一子像素确定该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系。示例性地，该针对显示器件的每一子像素确定该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系的过程，是在显示器件产品出厂之前完成的。下面，对预先针对显示器件的每一子像素确定该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系的过程进行示例性说明。
下面以显示器件支持256灰阶为例进行说明。当然并不限制于支持256灰阶的显示器，例如，也可以是1024灰阶的显示器。此处，以支持256灰阶的显示器为例进行说明，仅是为了更好的说明本发明的实施例。
示例性地，预先针对显示器件的每一子像素确定该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，包括：
步骤S401：根据选取的测试灰阶值确定不同的测试图案；
步骤S402：获取通过图像传感器采集的不同的测试图案下的测试亮度值；
步骤S403：根据多个测试灰阶值和该多个测试灰阶值下的测试亮度值，确定该子像素的测试亮度值与测试灰阶值的函数关系；
步骤S404：根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮度值与测试灰阶值的函数关系；
步骤S405：根据所述测试亮度值与测试灰阶值的函数关系以及所述目标 亮度值与测试灰阶值的函数关系，确定该子像素的每一测试灰阶值对应的灰阶补偿量；
步骤S406：根据该子像素的每一测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系，也就是，该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系。
在步骤S401中，根据该显示器件的亮度与灰阶的响应关系和图像传感器的性能参数，从所述显示器件的256个灰阶值中选取部分灰阶值作为测试灰阶值，例如，测试灰阶值包括G1、G2、G3……GK。确定了测试灰阶值之后，根据这些灰阶值确定不同的测试图案，并根据确定的测试图案控制显示器件的显示面板显示。根据测试灰阶值确定测试图案以及根据测试图案控制显示器件的显示面板显示均采用发明人已知的技术，在此不再赘述。
在步骤S402中，获取通过图像传感器采集的所述测试图案下的测试亮度值，例如，获取通过CCD采集的所述测试灰阶值下的每一子像素的测试亮度值。
对于包括i×j个子像素的显示器件，对于每一个子像素，在不同的测试灰阶值下，均可以得到一组测试亮度值的数组，例如对于第一行第一列的子像素，可以得到一个项数为K的数组：(L11,1、L11,2……L11,k)，第i行第j列的子像素对应的数组为：(Lij,1、Lij,2……Lij,k)，其中，L11,k为第一行第一列的子像素在测试灰阶值为Gk时的测试亮度值，Lij,k为第i行第j列的子像素在测试灰阶值为Gk时的测试亮度值。因此，对于该显示器件，可以得到i×j个数组。
而为了对每一子像素的亮度进行补偿，还需要确定一组对应K个测试灰阶值的目标亮度值。在确定该目标亮度值时，可以采用两种方式：一种方式是预先设定测试灰阶值下的目标亮度值，另一种方式是针对每一个测试灰阶值，对所有测试亮度值取平均值。在对所有测试亮度值取平均值获得目标亮度值时，例如可以采用如下公式：
Figure PCTCN2014088587-appb-000001
其中，Lk为测试灰阶值为GK时的目标亮度值，在GK的测试灰阶值下，对显示器件的所有子像素(i×j个子像素)的测试亮度值求平均，得到该测 试灰阶值下的目标亮度值LK。
在步骤S403中，根据多个测试灰阶值和该多个测试灰阶值下的测试亮度值，确定该子像素的测试亮度值与测试灰阶值的函数关系。例如，可以采用最小二乘法原理，针对每一子像素，对该子像素对应的多个测试灰阶值和该多个测试灰阶值下的测试亮度值的数组进行多项式拟合，得到该子像素的测试亮度值与测试灰阶值的函数关系，例如可以是如下多项式：
Lij,x＝Aij,nGx n+Aij,n-1Gx n-1+…+Aij,1Gx+Aij,0；
其中，Lij,x为第i行第j列的子像素的测试灰阶值Gx对应的测试亮度值，在支持256个灰阶的情况下，Gx取值为[0,255]，Aij,n为Gx的n次展开项的系数，n的取值为自然数。也就是说，在本发明的实施例中，不需要针对显示器件支持的所有灰阶值都进行测试，而只需要选取部分灰阶值作为测试灰阶值而得到测试亮度值。针对每一子像素，将多组测试灰阶值和测试亮度值的数组进行拟合，得到测试亮度值和测试灰阶值的函数关系。当然，不论采用怎样的拟合方法，只要通过该测试亮度值和测试灰阶值的函数关系得到的测试亮度值，能够最大限度的接近针对每一测试灰阶值实际测试的亮度值即可。如此，可以节省大量的测试时间，提高了亮度补偿的整体效率。
在步骤S404中，根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮度值与测试灰阶值的函数关系。例如，根据前面确定的多个测试灰阶值的目标亮度值，可以采用最小二乘法原理，对多个测试灰阶值和该多个测试灰阶值下的目标亮度值的数组进行多项式拟合，得到目标亮度值与测试灰阶值的函数关系，例如可以是如下多项式：
Lt,x＝Bt,nGx n+Bt,n-1Gx n-1+…+Bt,1Gx+Bt,0；
其中，Lt,x为输入灰阶值Gx对应的目标亮度值，在支持256个灰阶的情况下，Gx取值为[0,255]，Bt,n为Gx的n次展开项的系数，n的取值为自然数。
在步骤S405中，根据所述测试亮度值与测试灰阶值的函数关系以及所述目标亮度值与测试灰阶值的函数关系，确定该子像素的每一测试灰阶值对应的灰阶补偿量。
当测试亮度值与测试灰阶值的函数关系符合如下公式：
Lij,x＝Aij,nGx n+Aij,n-1Gx n-1+…+Aij,1Gx+Aij,0。
而且，当目标亮度值与输入灰阶值的函数关系符合如下公式，
Lt,x＝Bt,nGx n+Bt,n-1Gx n-1+…+Bt,1Gx+Bt,0。
以测试亮度值与测试灰阶值的函数关系、目标亮度值与测试灰阶值的函数关系分别满足上述公式为例对该步骤进行解释说明。
在测试亮度值与测试灰阶值的函数关系、目标亮度值与测试灰阶值的函数关系分别满足上述公式时，可以得到如图4所示的测试亮度值与目标亮度值对测试灰阶值的曲线的对比图。其中测试亮度曲线1和测试亮度曲线2分别为用于举例说明的任意选取的第一个子像素和第二个子像素的测试亮度值与测试灰阶值的曲线。在同一测试灰阶值下，为了达到各个子像素的亮度相同，需要以目标亮度值为基准，分别调整两个子像素的灰阶值，如图5所示，Gk为所选灰阶值，第一个子像素在该测试灰阶值下的测试亮度值为L1k，第二个子像素在该测试灰阶值下的测试亮度值为L2k；G1k＇为第一个子像素达到目标亮度值Lk的新灰阶值；G2k＇为第二个子像素达到目标亮度值Lk的新灰阶值，△G1k为第一个子像素达到目标亮度值Lk的灰阶补偿量、△G2k为第二个子像素达到目标亮度值Lk的灰阶补偿量。Gmax表示显示器件的最大灰阶值；L1k’表示测试亮度曲线1上G1k＇对应的测试亮度值，L2k’表示测试亮度曲线2上G2k＇对应的测试亮度值，L1k’和L2k’的值与L1k的值相等。根据上述方法，可以得到每个子像素的各个输入灰阶值的灰阶补偿量。
在步骤S406中，根据该子像素的每一测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系。示例性地，根据得到的每个子像素的各个测试灰阶值的灰阶补偿量，针对每一子像素的多个灰阶补偿量，进行多项式拟合，得到补偿后的灰阶值Gij,x＇与输入灰阶值Gij,x的多项式，例如该多项式符合如下公式：
Gij,x＇＝Cij,nGx n+Cij,n-1Gx n-1+…+Cij,1Gx+Cij,0；
其中，Gij,x＇为第i行第j列的子像素对应的补偿后的灰阶值，Gx为该子像素对应的输入灰阶值，Cij,n为Gx的n次展开项的系数，n的取值为自然数，i、j的取值为正整数。更为直观的，根据该公式可以得到如图6所示的补偿后的灰阶值Gij,x＇和输入灰阶值Gx的关系曲线图，从图6所示的关系曲线图中，可以更为直观的理解补偿后的灰阶值和输入灰阶值的对应关系。
需要说明的是，当采用补偿后的灰阶值Gij,x＇与输入灰阶值Gij,x的多项式作为子像素对应的补偿后的灰阶值与输入灰阶值的函数关系时，以该多项 式中每一个系数的数据大小为8比特为例，则对于一个包含i×j个子像素的显示器件来说，这些系数组成的数据大小为i×j×(n+1)×8比特，以显示器件包括3840*2160个像素为例，系数的数据大小为3840*2160*3*(n+1)*8比特，因此n值的大小决定了算法的复杂度，在保证补偿效果的条件下，选择较小的n值可以更多的节约资源，因此，n取值一般不大于3，也就是说，Gx的最高次幂为3，这样能使所有的数据大小小于1G比特。
在预先针对显示器件的每一子像素设置该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系之后，将该函数关系保存至显示器件的存储器中。示例性地，由于非易失性存储器的数据保存寿命长，易失性存储器读取数据的速度快，因此，将该函数关系保存至显示器件的存储器中时，是将该函数关系保存到显示器件的非易失性存储器。
在显示器件正常工作时，先将每一子像素对应的补偿后的灰阶值与输入灰阶值的函数关系从非易失存储器中读取到易失性存储器中，再从易失性存储器中实时地获取每一子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，从而能够实时的进行亮度补偿，最终使显示器件的亮度均匀性得到改善。示例性地，在显示器件正常工作时，对显示器件的亮度补偿的方法，如下：
针对输入图像中与显示器件相对应的每一子像素，具体执行：
步骤S801：获取当前子像素的输入灰阶值以及与当前子像素对应的函数关系；所述函数关系是预先针对显示器件的每一个子像素，根据该子像素在多个不同灰阶值的测试图案下的测试亮度值和目标亮度值确定出来的，且该函数关系为该子像素对应的补偿后的灰阶值与输入灰阶值的对应关系；
步骤S802：利用该子像素的输入灰阶值和对应的所述函数关系，得到该子像素对应的补偿后的灰阶值，根据补偿后的灰阶值对该子像素进行亮度补偿。
本发明实施例提供的上述亮度补偿方法，预先根据每一子像素在多个测试图案下的测试亮度值和目标亮度值，设置该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，在显示器件正常显示时，获取每一子像素对应的函数关系，针对输入图像中的每一子像素的输入灰阶值，利用该子像素对应的所述函数关系对该子像素进行亮度补偿，不需要针对每一测试图案进行多次测量，从而在提高显示器件亮度均匀性的过程中，提高了对显示器件亮度 信息抽取的效率。进一步，通过将预先针对显示器件的每一子像素设置的该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系保存到非易失性存储器中，能够保证存储数据的寿命；同时，在显示器件正常工作时，将所述函数关系从非易失性存储器中读取到易失性存储器中，并实时从易失性存储器中获取所述函数关系，从而保证了实时补偿的效率。
以上对本发明实施例提供的显示器件的亮度补偿方法进行了详细说明，下面结合附图对本发明实施例提供的显示器件的亮度补偿装置进行说明。
如图7所示，本发明实施例提供的显示器件的亮度补偿装置，包括：
获取单元Z91，构造为：针对输入图像中与显示器件相对应的每一子像素，获取当前子像素的输入灰阶值以及与当前子像素对应的函数关系；所述函数关系是预先针对显示器件的每一个子像素，根据该子像素在多个不同灰阶值的测试图案下的测试亮度值和目标亮度值确定出来的且所述函数关系为该子像素对应的补偿后的灰阶值与输入灰阶值的对应关系；
补偿单元Z92，构造为：针对输入图像中与显示器件相对应的每一子像素，利用该子像素的输入灰阶值和对应的所述函数关系，得到该子像素对应的补偿后的灰阶值，根据补偿后的灰阶值对该子像素进行亮度补偿。
示例性地，本发明实施例提供的上述亮度补偿装置可以是显示器件的控制模块。其中，获取单元以及补偿单元均可以例如由处理器来实现。
本发明实施例提供的上述亮度补偿装置，预先根据每一子像素在多个测试图案下的测试亮度值和目标亮度值，设置该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，在显示器件正常显示时，获取每一子像素对应的函数关系，针对输入图像中的每一子像素，利用该子像素对应的所述函数关系对该子像素进行亮度补偿，不需要针对每一测试图案进行多次测量，从而在提高显示器件亮度均匀性的过程中，提高了对显示器件亮度信息抽取的效率。
示例性地，该亮度补偿装置还可以包括：
预设单元，构造为：
对于每一子像素，
根据多个测试灰阶值和该多个测试灰阶值下的测试亮度值，确定该子像素的测试亮度值与测试灰阶值的函数关系；
根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮度值与测试灰阶值的函数关系；
根据所述测试亮度值与输入灰阶值的函数关系以及所述目标亮度值与测试灰阶值的函数关系，确定该子像素的每一测试灰阶值对应的灰阶补偿量；
根据该子像素的每一测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系，也就是，该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系。
需要说明的是，该预设单元可以设置在显示器件内部，也可以独立于显示器件之外。示例性地，该预设单元为独立于显示器件之外的数据处理器。
在本发明实施例中，根据多个测试灰阶值和该多个测试灰阶值下的测试亮度值，确定该子像素的测试亮度值与测试灰阶值的函数关系；以及根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮度值与测试灰阶值的函数关系；以及根据所述测试亮度值与输入灰阶值的函数关系以及所述目标亮度值与测试灰阶值的函数关系，确定该子像素的每一测试灰阶值对应的灰阶补偿量；以及根据该子像素的每一测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系；在确定函数关系时，例如，均可以采用多项式拟合的方法或伽马函数拟合的方法。
示例性地，所述预设单元还可以构造为：
在从所述显示器件的所有灰阶值中选取部分灰阶值作为测试灰阶值，并根据选取的测试灰阶值确定测试图案之后，获取通过图像传感器采集不同测试图案下的测试亮度值。
例如，以显示器件支持256个灰阶显示为例，在实际测试中，针对不同的测试需要，根据该显示器件的亮度与灰阶的响应关系和图像传感器的性能参数，选取256个灰阶值中的部分灰阶值作为测试灰阶值，例如，可以选6个灰阶值作为测试灰阶值，如此，可以进一步提高信息抽取的效率。当然，也可以将256个灰阶值中的每一灰阶值对应的图案都进行测试。
示例性地，所述获取单元构造为：从易失性存储器中获取与当前子像素对应的函数关系。
由于从易失性存储器中读取数据的速度较快，因此在显示器件实时显示 画面时，能够快速的对输入图像的每一子像素进行亮度补偿。
示例性地，所述获取单元还可以构造为：
在从易失性存储器中获取与当前子像素对应的函数关系之前，将与当前子像素对应的函数关系从非易失性存储器中读取到易失性存储器中。
由于易失性存储器保存数据的时间较短，因此，通过将预先针对显示器件的每一子像素设置的该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系保存到非易失性存储器中，能够保证存储数据的寿命；同时，在显示器件正常工作时，将所述函数关系从非易失性存储器中读取到易失性存储器中，并实时从易失性存储器中获取所述函数关系，从而保证了实时补偿的效率。
示例性地，任一子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，符合如下公式：
Gij,x＇＝Cij,nGx n+Cij,n-1Gx n-1+…+Cij,1Gx+Cij,0；
其中，Gij,x＇为第i行第j列的子像素对应的补偿后的灰阶值，Gx为该子像素对应的输入灰阶值，Cij,n为Gx的n次展开项的系数，n的取值为自然数，i、j的取值为正整数。
本发明实施例还提供了一种显示器件，该显示器件包括上述的亮度补偿装置。所述显示器件可以为：液晶面板、电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
下面以预设单元为独立于显示器件之外的数据处理器为例，同时以该亮度补偿装置为显示器件的控制模块为例进行说明。
如图8所示，在对显示器件Z101进行亮度补偿时，通过图像传感器Z103采集在测试图案下的像素的测试亮度值。
其中，显示器件Z101包括显示面板Z1011和控制显示面板显示的控制模组Z1012。
示例性地，控制模组Z1012包括：控制模块Z10120、非易失性存储器Z10121、易失性存储器Z10122以及接口模块。
示例性地，控制模块Z10120包括：
获取单元，构造为：针对输入图像中与显示器件相对应的每一子像素，获取当前子像素的输入灰阶值，以及与当前子像素对应的函数关系；所述函 数关系为：预先针对显示器件的每一个子像素，根据该子像素在多个不同灰阶值的测试图案下的测试亮度值和目标亮度值确定出来的、该子像素对应的补偿后的灰阶值与输入灰阶值的对应关系；
补偿单元，构造为：针对输入图像中与显示器件相对应的每一子像素，利用该子像素的输入灰阶值和对应的所述函数关系，得到该子像素对应的补偿后的灰阶值，根据补偿后的灰阶值对该子像素进行亮度补偿；
非易失性存储器Z10121和易失性存储器Z10122均用于存储预先针对显示器件的每一子像素设置的该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系。其中，非易失性存储器Z10121用于存储数据处理器Z102发送的预先针对显示器件的每一子像素设置的该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，易失性存储器Z10122用于存储控制模块从非易失性存储器Z10121中读取的预先针对显示器件的每一子像素设置的该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系；以及
接口模块，在测试阶段用于接收输入的测试图案，在显示器正常显示时用于接收输入图像。该模块采用发明人已知的技术，不再赘述。
显示面板Z1011可以是AMOLED，也可以是液晶显示面板，在此不作限定。
示例性地，数据处理器Z102，构造为：在从所述显示器件的所有灰阶值中选取部分灰阶值作为测试灰阶值，并根据选取的测试灰阶值确定测试图案之后，获取通过图像传感器采集不同测试图案下的测试亮度值；
以及，对于每一子像素，
根据多个测试灰阶值和该多个测试灰阶值下的测试亮度值，确定该子像素的测试亮度值与测试灰阶值的函数关系；
根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮度值与测试灰阶值的函数关系；
根据所述测试亮度值与测试灰阶值的函数关系以及所述目标亮度值与测试灰阶值的函数关系，确定该子像素的每一测试灰阶值对应的灰阶补偿量；
根据该子像素的每一测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与测试灰阶值的函数关系，也就是，该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系。
综上所述，本发明实施例提供的一种显示器件的亮度补偿方法、亮度补偿装置及显示器件，预先根据每一子像素在多个测试图案下的测试亮度值和目标亮度值，确定该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，在显示器件正常显示时，针对输入图像中与显示器件相对应的每一子像素，获取每一子像素对应的函数关系，利用该子像素对应的所述函数关系对该子像素进行亮度补偿，不需要针对显示器件的每一灰阶值都进行测量，从而在提高显示器件亮度均匀性的过程中，提高了对显示器件亮度信息抽取的效率。进一步，通过将预先针对显示器件的每一子像素设置的该子像素对应的补偿后的灰阶值与输入灰阶值的函数关系保存到非易失性存储器中，能够保证存储数据的寿命；同时，在显示器件正常工作时，将所述函数关系从非易失性存储器中读取到易失性存储器中，并实时从易失性存储器中获取所述函数关系，从而保证了实时补偿的效率。
本发明实施例的方案是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。
本申请要求于2014年5月30日递交的中国专利申请第201410240526.7号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (20)

  1. 一种显示器件的亮度补偿方法，包括：
    获取输入图像的与所述显示器件相对应的多个子像素之一的输入灰阶值，并获取与所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系；
    利用所述函数关系，得到与所述子像素对应的补偿后的灰阶值，根据所述补偿后的灰阶值对所述子像素进行亮度补偿；
    然后针对所述输入图像的多个子像素中每个重复执行以上操作。
  2. 根据权利要求1所述的亮度补偿方法，其中所述函数关系是针对所述显示器件的每个子像素、根据所述每个子像素在多个不同测试灰阶值的测试图案下的测试亮度值和目标亮度值确定出来的。
  3. 根据权利要求2所述的亮度补偿方法，其中所述函数关系通过以下步骤被确定：
    根据多个测试灰阶值和该多个测试灰阶值下的所述测试亮度值，确定所述显示器件的每个子像素的测试亮度值与所述测试灰阶值的函数关系；
    根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定所述子像素的目标亮度值与所述测试灰阶值的函数关系；
    根据所述测试亮度值与所述测试灰阶值的函数关系以及所述目标亮度值与所述测试灰阶值的函数关系，确定所述子像素的每个测试灰阶值对应的灰阶补偿量；
    根据所述子像素的每个测试灰阶值对应的所述灰阶补偿量，确定所述子像素对应的补偿后的灰阶值与所述测试灰阶值的函数关系，所述子像素对应的补偿后的灰阶值与所述测试灰阶值的函数关系就是所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系。
  4. 根据权利要求3所述的亮度补偿方法，在所述函数关系被确定之前，还包括：
    从所述显示器件的所有灰阶值中选取部分灰阶值作为所述多个测试灰阶值；
    根据选取的所述多个测试灰阶值确定不同的测试图案；
    通过图像传感器采集不同的测试图案下的所述测试亮度值。
  5. 根据权利要求1所述的亮度补偿方法，其中所述获取与所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系包括：
    从易失性存储器中获取所述函数关系。
  6. 根据权利要求5所述的亮度补偿方法，其中所述获取与所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系还包括：
    在从所述易失性存储器中获取所述函数关系之前，将与所述子像素对应的函数关系从非易失性存储器中读取到所述易失性存储器中。
  7. 根据权利要求1-5中任一项所述的亮度补偿方法，其中与所述多个子像素的每个对应的补偿后的灰阶值与所述输入灰阶值的函数关系，符合如下公式：
    Gij,x＇＝Cij,nGx n+Cij,n-1Gx n-1+…+Cij,1Gx+Cij,0，
    其中，Gij,x＇为第i行第j列的子像素对应的补偿后的灰阶值，Gx为该子像素对应的输入灰阶值，Cij,n为Gx的n次展开项的系数，n为自然数，i、j为正整数。
  8. 根据权利要求3所述的亮度补偿方法，其中所述显示器件的每个子像素的测试亮度值与所述测试灰阶值的函数关系满足以下公式：
    Lij,x＝Aij,nGx n+Aij,n-1Gx n-1+…+Aij,1Gx+Aij,0，
    其中，Lij,x为第i行第j列的子像素的输入灰阶值Gx对应的测试亮度值，Gx为该子像素对应的输入灰阶值，Aij,n为Gx的n次展开项的系数，n为自然数，i、j为正整数。
  9. 根据权利要求3所述的亮度补偿方法，其中每个所述子像素在每个所述测试灰阶值下的目标亮度值是预先设定的。
  10. 根据权利要求3所述的亮度补偿方法，其中每个所述子像素在每个所述测试灰阶值下的目标亮度值是通过在所述测试灰阶值下对多个所述子像素的所述测试亮度值取平均值而获得的。
  11. 根据权利要求9或10所述的亮度补偿方法，其中所述子像素的目标亮度值与所述测试灰阶值的函数关系满足以下关系式：
    Lt,x＝Bt,nGx n+Bt,n-1Gx n-1+…+Bt,1Gx+Bt,0，
    其中Lt,x为输入灰阶值Gx对应的目标亮度值，Bt,n为Gx的n次展开项的 系数，n为自然数，i、j为正整数。
  12. 一种显示器件的亮度补偿装置，包括：
    获取单元，构造为：针对输入图像中与显示器件相对应的每个子像素，获取当前子像素的输入灰阶值，并获取与所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系；
    补偿单元，构造为：针对所述输入图像中与所述显示器件相对应的每一子像素，利用该子像素的所述输入灰阶值和所述函数关系，得到该子像素对应的补偿后的灰阶值，根据补偿后的灰阶值对该子像素进行亮度补偿。
  13. 根据权利要求12所述的亮度补偿装置，还包括：
    预设单元，构造为：对于所述显示器件的每个子像素，根据多个测试灰阶值和该多个测试灰阶值下的多个测试亮度值，确定每个子像素的测试亮度值与所述测试灰阶值的函数关系；
    根据多个测试灰阶值与该多个测试灰阶值下的目标亮度值，确定该子像素的目标亮度值与所述测试灰阶值的函数关系；
    根据所述测试亮度值与所述测试灰阶值的函数关系以及所述目标亮度值与所述测试灰阶值的函数关系，确定所述每个子像素的每个所述测试灰阶值对应的灰阶补偿量；
    根据该子像素的每个所述测试灰阶值对应的灰阶补偿量，确定该子像素对应的补偿后的灰阶值与所述测试灰阶值的函数关系，所述子像素对应的补偿后的灰阶值与所述测试灰阶值的函数关系就是所述子像素对应的补偿后的灰阶值与所述输入灰阶值的函数关系。
  14. 根据权利要求13所述的亮度补偿装置，其中所述预设单元还构造为：
    从所述显示器件的所有灰阶值中选取部分灰阶值作为所述多个测试灰阶值，根据选取的所述多个测试灰阶值确定多个测试图案，并通过图像传感器采集所述多个测试图案的每个测试图案下的测试亮度值来获取所述多个测试亮度值。
  15. 根据权利要求12所述的亮度补偿装置，其中所述获取单元构造为：从易失性存储器中获取所述函数关系。
  16. 根据权利要求15所述的亮度补偿装置，其中所述获取单元还构造为：
    在从所述易失性存储器中获取所述函数关系之前，将与所述当前子像素 对应的所述函数关系从非易失性存储器中读取到所述易失性存储器中。
  17. 根据权利要求12-16中任一项所述的亮度补偿装置，其中所述每个子像素对应的补偿后的灰阶值与输入灰阶值的函数关系，符合如下公式：
    Gij,x＇＝Cij,nGx n+Cij,n-1Gx n-1+…+Cij,1Gx+Cij,0，
    其中，Gij,x＇为第i行第j列的子像素对应的补偿后的灰阶值，Gx为该子像素对应的输入灰阶值，Cij,n为Gx的n次展开项的系数，n为自然数，i、j为正整数。
  18. 一种显示器件，包括：如权利要求12-17中任一项所述的亮度补偿装置。
  19. 根据权利要求18所述的显示器件，其中所述亮度补偿装置是所述显示器件的控制模块。
  20. 根据权利要求18或19所述的显示器件，其中所述亮度补充装置中的预设单元是设置在所述显示器件外部的处理器。
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