WO2019090794A1 - Système de correction gamma et procédé de correction associé - Google Patents

Système de correction gamma et procédé de correction associé Download PDF

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Publication number
WO2019090794A1
WO2019090794A1 PCT/CN2017/110905 CN2017110905W WO2019090794A1 WO 2019090794 A1 WO2019090794 A1 WO 2019090794A1 CN 2017110905 W CN2017110905 W CN 2017110905W WO 2019090794 A1 WO2019090794 A1 WO 2019090794A1
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sub
pixel
values
brightness
value
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PCT/CN2017/110905
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Chinese (zh)
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沈利军
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武汉华星光电半导体显示技术有限公司
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Publication of WO2019090794A1 publication Critical patent/WO2019090794A1/fr

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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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a gamma correction system and a calibration method thereof.
  • the Gamma correction is to edit the display gamma curve, and the gamma curve is the relationship between the grayscale voltage and the corresponding brightness.
  • the display brightness is nonlinearly edited.
  • the general gamma value of the display is 2.2, and the gamma value in the case of picture distortion is deviated from 2.2, so the gamma correction of the display is essential for accurate display color.
  • the present invention provides a gamma correction system and a calibration method thereof, which requires a shorter correction time, does not need to store grayscale values, and saves hardware resources.
  • the specific technical solution proposed by the present invention is to provide a calibration method of a gamma correction system, and the calibration method includes the following steps:
  • the fitting curve corresponding to the sub-pixels is stored in the memory.
  • n gray scale values corresponding to each of the R sub-pixel, the G sub-pixel, and the B sub-pixel according to the color coordinates and the brightness value of the R sub-pixel, the G sub-pixel, and the B sub-pixel include:
  • the method before the step of calculating the tristimulus value of the W sub-pixel according to the color coordinates and the brightness value of the W sub-pixel, the method further includes:
  • the method used for the fitting is a least squares method.
  • n is not less than 4.
  • n is equal to 4, and the values of the four grayscale values are 0 to 64, 65 to 128, 129 to 192, and 193 to 255, respectively.
  • the calculation formula of the total deviation of the n second brightness values of the sub-pixels and the corresponding n first brightness values is:
  • x i represents the i-th gray scale value
  • ⁇ (x i ) represents the second luma value corresponding to the i-th gray scale value x i
  • Y(x i ) represents the corresponding i-th gray scale value x i A brightness value.
  • the threshold is 5-10.
  • the invention also provides a gamma correction system, the gamma correction system comprising:
  • An obtaining unit configured to acquire color coordinates and brightness values of R sub-pixels, G sub-pixels, and B sub-pixels in one pixel unit;
  • a fitting point generating unit configured to select n gray scale values, and calculate the R sub-pixel, the G sub-pixel, and the B sub-pixel according to color coordinates and brightness values of the R sub-pixel, the G sub-pixel, and the B sub-pixel n first luminance values corresponding to n gray scale values of each sub-pixel, each of which is formed by n gray scale values of each sub-pixel as abscissa and corresponding n first luminance values as vertical coordinates n fit points of the pixel;
  • a fitting curve generating unit configured to fit n fitting points of each sub-pixel to obtain a fitting curve of each sub-pixel
  • a determining unit configured to respectively calculate n second brightness values corresponding to the n gray level values according to the fitting curve of each sub-pixel, and determine n first brightness values and n first brightness values corresponding to the sub-pixels Whether the total deviation is less than the threshold;
  • a memory configured to store a fitting curve corresponding to the sub-pixel when a total deviation of the n second brightness values of the sub-pixels and the corresponding n first brightness values is less than the threshold.
  • the correction method of the gamma correction system proposed by the invention calculates n first brightness values corresponding to n gray scale values for each sub-pixel by selecting n gray scale values, and then uses n gray scale values as abscissas, Corresponding n first brightness values form ordinates forming n fitting points, fitting n fitting points to obtain a fitting curve of each sub-pixel; finally, n second brightness values and the sub-pixels A fitting curve of the corresponding total deviation of the n first brightness values is less than a threshold value as a fitting curve of the sub-pixels and stored in a memory, according to which a given gray scale value of each sub-pixel can be obtained. Corresponding brightness does not require storage of grayscale values, which saves hardware resources, and the entire calibration process only needs to fit n fitting points, which greatly shortens the correction time.
  • 1 is a flow chart of a calibration method of a gamma correction system
  • Figure 2 is a block diagram of a Gamma correction system.
  • the calibration method of the gamma correction system includes the following steps:
  • S2 selecting n gray scale values, and calculating n gray scale values of each of the R sub-pixel, the G sub-pixel, and the B sub-pixel according to the color coordinates and the brightness value of the R sub-pixel, the G sub-pixel, and the B sub-pixel.
  • Corresponding n first brightness values respectively forming n fitting points of each sub-pixel with n gray scale values of each sub-pixel as abscissa and corresponding n first brightness values as vertical coordinates;
  • the fitting curve corresponding to the sub-pixel is stored in the memory.
  • the calibration method of the gamma correction system is applied to the AMOLED as an example.
  • the correction method in this embodiment will be specifically described below.
  • step S1 the Gamma voltage of the test is input, and the color coordinates and the brightness values of the R sub-pixel, the G sub-pixel, and the B sub-pixel are obtained, wherein the color coordinates and the brightness of the R sub-pixel are expressed as (x r , y r , Y r ), x r , y r represents the color coordinates of the R sub-pixel, Y r represents the brightness of the R sub-pixel; the color coordinates and brightness of the G sub-pixel are expressed as (x g , y g , Y g ), x g , y g represents the color coordinate of the G sub-pixel, Y g represents the luminance of the G sub-pixel; the color coordinates and brightness of the B sub-pixel are expressed as (x b , y b , Y b ), and x b , y b represents the color of the B sub-pixel Coordinates, Y b represents the brightness of the B sub
  • n first luminance values Y(x i ) corresponding to n gray scale values of each sub-pixel that is, first calculating R sub-pixels according to color coordinates and luminance values of R sub-pixels, G sub-pixels, and B sub-pixels n first luminance values Y R (x i ) corresponding to n gray scale values
  • Y R (x i ) represents a first luminance value corresponding to the R sub-pixels
  • Y G (x i ) represents a first luminance value corresponding to the R sub-pixels
  • Y G (x i ) represents the first brightness value corresponding to the R sub-pixel
  • the n first luminance values Y B (x i ) corresponding to the n gray scale values of the B sub-pixels are calculated according to the color coordinates and the luminance values of the R sub-pixel
  • the n fitting points of each sub-pixel are formed by n gray scale values of each sub-pixel and the corresponding n first luminance values are vertical coordinates, that is, n fitting points corresponding to the R sub-pixels For (x 1 , Y R (x 1 )), (x 2 , Y R (x 2 )), ..., (x n , Y R (x n )), the n fitting points corresponding to the G sub-pixels For (x 1 , Y G (x 1 )), (x 2 , Y G (x 2 )), ..., (x n , Y G (x n )), the n fitting points corresponding to the B sub-pixels Is (x 1 , Y B (x 1 )), (x 2 , Y B (x 2 )), ..., (x n , Y B (x n )).
  • n is not less than 3.
  • n is another value, and so on.
  • step S2 includes:
  • the four fitting points corresponding to the R sub-pixels are (x 1 , Y R (x 1 )), (x 2 , Y R (x 2 )), (x) 3 , Y R (x 3 )), (x 4 , Y R (x 4 ));
  • the four fitting points corresponding to the G sub-pixels are (x 1 , Y G (x 1 )), (x 2 , Y G (x 2 )), (x 3 , Y G (x 3 )), (x 4 , Y G (x 4 ));
  • the four fitting points corresponding to the B sub-pixel are (x 1 , Y B (x 1 )), (x 2 , Y B (x 2 )), (x 3 , Y B (x 3 )), (x 4 , Y B (x 4 )).
  • the method further includes:
  • S212 Determine a maximum brightness value of the W sub-pixel according to a maximum brightness value of the R sub-pixel, the G sub-pixel, and the B sub-pixel, wherein a maximum brightness value of the R sub-pixel, the G sub-pixel, and the B sub-pixel is performed according to a register of the driving IC. It is set that the luminance of the W sub-pixel is synthesized by the luminances of the R sub-pixel, the G sub-pixel, and the B sub-pixel. Therefore, the maximum luminance value of the W sub-pixel is equal to the maximum luminance value of the R sub-pixel, the G sub-pixel, and the B sub-pixel.
  • the reliability of the obtained data can be ensured by steps S211 to S213, thereby ensuring the reliability of the entire fitting process and improving the stability of the entire calibration system.
  • step S3 the fitting points of each sub-pixel are fitted to obtain a fitting curve of each sub-pixel.
  • the method used for fitting is a least square method, and the function used is fitted.
  • ⁇ (x) ax b , a>0, b>0, ⁇ (x) represents the second luminance value corresponding to the grayscale value x.
  • the fitting function in this embodiment may also select a fitting function in other functional forms, for example, a polynomial function, which is not limited herein.
  • the four fitting points corresponding to the R sub-pixels are (x 1 , Y R (x 1 )), (x 2 , Y R (x 2 )), (x 3 , Y R (x 3 )), (x) 4 , Y R (x 4 ))
  • the least squares equations used for fitting are:
  • the fitting curve of the R sub-pixel can be obtained by solving the above-mentioned least squares equations.
  • the four fitting points corresponding to the G sub-pixels are (x 1 , Y G (x 1 )), (x 2 , Y G (x 2 )), (x 3 , Y G (x 3 )), (x) 4 , Y G (x 4 ))
  • the least squares equations used for fitting are:
  • the fitting curve of the G sub-pixel can be obtained by solving the above-mentioned least squares equations.
  • the four fitting points corresponding to the B sub-pixels are (x 1 , Y B (x 1 )), (x 2 , Y B (x 2 )), (x 3 , Y B (x 3 )).
  • the least squares equations used for fitting (x 4 , Y B (x 4 )) are:
  • the fitting curve of the G sub-pixel can be obtained by solving the above-mentioned least squares equations.
  • step S4 the n second brightness values corresponding to the n gray level values are respectively calculated according to the fitting curve of each sub-pixel, and the n second brightness values and the n first brightness values corresponding to the sub-pixel are determined. Whether the total deviation is less than the threshold ⁇ 0 .
  • the formula for calculating the total deviation ⁇ of the n second luminance values of each sub-pixel and the corresponding n first luminance values is:
  • x i represents the i-th gray scale value
  • ⁇ (x i ) represents the second luma value corresponding to the i-th gray scale value x i
  • Y(x i ) represents the corresponding i-th gray scale value x i A brightness value.
  • the four second luminance values corresponding to the four grayscale values of the R sub-pixel are (x 1 , ⁇ R (x 1 )), (x 2 , ⁇ R (x 2 )), (x 3 , ⁇ R (x 3 ) )), (x 4 , ⁇ R (x 4 )), then the total deviation of the R sub-pixels is:
  • the four second luminance values corresponding to the four grayscale values of the G sub-pixel are (x 1 , ⁇ G (x 1 )), (x 2 , ⁇ G (x 2 )), (x 3 , ⁇ G (x 3 ) )), (x 4 , ⁇ G (x 4 )), then the total deviation of the R sub-pixels is:
  • the four second brightness values corresponding to the four gray scale values of the B sub-pixel are (x 1 , ⁇ B (x 1 )), (x 2 , ⁇ B (x 2 )), (x 3 , ⁇ B (x 3 ) )), (x 4 , ⁇ B (x 4 )), then the total deviation of the R sub-pixels is:
  • step S5 if the total deviation ⁇ of the n second luminance values of the sub-pixels and the corresponding n first luminance values is less than the threshold ⁇ 0 , that is, ⁇ ⁇ 0 , the corresponding fitting of the sub-pixels is performed.
  • the embodiment according to the fitting curve, the brightness corresponding to the gray scale value of each sub-pixel can be obtained, the gray scale value is not stored, the hardware resources are saved, and only n fitting points are needed for the entire calibration process.
  • the fitting is done, which greatly shortens the calibration time.
  • the embodiment also considers the influence of the W sub-pixel when generating the fitting curve. Therefore, the correction method of the embodiment also corrects the white balance while correcting the gamma, and similarly, the white balance correction is greatly saved. time.
  • the embodiment further provides a gamma correction system, which includes an acquisition unit 1, a fitting point generation unit 2, a fitting curve generation unit 3, a determination unit 4, and a memory 5.
  • the obtaining unit 1 is configured to acquire color coordinates and brightness values of the R sub-pixel, the G sub-pixel, and the B sub-pixel in one pixel unit.
  • the fitting point generating unit 2 is configured to select n gray scale values, and calculate each of the R sub-pixel, the G sub-pixel, and the B sub-pixel according to the color coordinates and the brightness value of the R sub-pixel, the G sub-pixel, and the B sub-pixel.
  • the fitting curve generating unit 3 is configured to fit the n fitting points of each sub-pixel to obtain a fitting curve of each sub-pixel.
  • the determining unit 4 is configured to respectively calculate n second brightness values corresponding to the n gray level values according to the fitting curve of each sub-pixel, and determine n second brightness values and n first brightness values corresponding to the sub-pixels. Whether the total deviation is less than the threshold.
  • the memory 5 is configured to store a fitting curve corresponding to the sub-pixel when the total deviation of the n second brightness values of the sub-pixels and the corresponding n first brightness values is less than a threshold.
  • the fitting point generating unit 2 is further configured to calculate color coordinates and luminance values (x w , y w , Y w ) of the W sub-pixels according to color coordinates and luminance values of the R sub-pixel, the G sub-pixel, and the B sub-pixel, respectively.
  • the fitting point generating unit 2 is further configured to acquire a maximum brightness value of the R sub-pixel, the G sub-pixel, and the B sub-pixel, and determine the W sub-pixel according to the maximum brightness value of the R sub-pixel, the G sub-pixel, and the B sub-pixel. The maximum brightness value and whether the maximum brightness value of the W sub-pixel is greater than the brightness value of the W sub-pixel.

Abstract

La présente invention concerne un système de correction gamma et un procédé de correction associé. Le procédé comprend : l'acquisition de coordonnées de couleur d'un sous-pixel R, d'un sous-pixel V et d'un sous-pixel B dans une unité de pixel, et d'une valeur de luminosité correspondante (S1) ; la sélection de n valeurs d'échelle de gris, le calcul de n premières valeurs de luminosité correspondant aux n valeurs d'échelle de gris pour chacun des sous-pixels, et l'utilisation des n valeurs d'échelle de gris en tant que valeurs de coordonnées horizontales et des n premières valeurs de luminosité correspondantes en tant que valeurs de coordonnées verticales pour obtenir n points d'ajustement (S2) ; la réalisation d'une opération d'ajustement sur les n points d'ajustement pour obtenir une courbe d'ajustement pour chacun des sous-pixels (S3) ; et l'utilisation d'une courbe d'ajustement, ayant une différence totale entre n secondes valeurs de luminosité et les n premières valeurs de luminosité correspondant au sous-pixel qui est inférieure à une valeur seuil, en tant que courbe d'ajustement du sous-pixel, et le stockage de celle-ci dans un dispositif de mémoire (S5). La luminosité correspondant à une valeur d'échelle de gris donnée de chaque sous-pixel peut être obtenue selon la courbe d'ajustement, de sorte qu'il n'est pas nécessaire de stocker des valeurs d'échelle de gris, ce qui économise des ressources matérielles. L'ensemble du processus de correction requiert uniquement l'ajustement de n points d'ajustement, ce qui réduit grandement le temps nécessaire à une correction gamma.
PCT/CN2017/110905 2017-11-08 2017-11-14 Système de correction gamma et procédé de correction associé WO2019090794A1 (fr)

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