CN108257557B - Pixel brightness value compensation method - Google Patents
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- CN108257557B CN108257557B CN201810054288.9A CN201810054288A CN108257557B CN 108257557 B CN108257557 B CN 108257557B CN 201810054288 A CN201810054288 A CN 201810054288A CN 108257557 B CN108257557 B CN 108257557B
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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
- G09G3/3258—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 with pixel circuitry controlling the voltage across the light-emitting element
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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
- 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
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a pixel brightness value compensation method, which comprises the following steps: setting all pixels on a screen to display white, and adjusting the gray scale value of the white screen according to a first brightness value; measuring actual gray-scale values of a plurality of pixels on the screen, and taking the minimum actual gray-scale value in the measurement result as a second brightness value; calculating a difference value between the first brightness value and the second brightness value to obtain a first difference value; adjusting the gray scale value of the white screen to a third brightness value again, wherein the gray scale value of the third brightness value is equal to the sum of the gray scale value of the first brightness value and the first difference value; calculating final first color sub-pixel offset values for all pixels, final second color sub-pixel offset values for all pixels, and final third color sub-pixel offset values for all pixels; and the pixel driving chip outputs the driving power supply voltage corresponding to the final brightness value by combining the third brightness value according to the final first color sub-pixel deviation value, the final second color sub-pixel deviation value and the final third color sub-pixel deviation value corresponding to each pixel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel brightness value compensation method.
Background
The Active Matrix Organic Light Emitting Diode (AMOLED) has many advantages such as wide viewing angle, high contrast, low power consumption, light weight, and capability of implementing flexible display and large-area full color display, and is considered as the most promising display device in the industry. However, the inventor finds that, with the development of the technology, the large-size and high-resolution AMOLED display is gradually developed, the corresponding panel wire length is longer and longer, the wire resistance is also larger and larger, and the pixel driving chip generates a voltage drop for the driving power voltage provided by the AMOLED, so that the driving power voltage obtained by each pixel is different, and different pixels have different voltage, current and brightness value outputs under the condition of the same data signal input, and as a result, the display of the whole panel is not uniform.
The main methods for solving the technical problems at present are as follows: designing a special pixel circuit and matching with a corresponding control timing chart to compensate the driving power supply voltage so as to eliminate the influence of voltage drop caused by the driving power supply voltage; secondly, carrying out grid wiring on the driving power supply wiring of the pixel driving chip to ensure that the voltage of the driving power supply is uniformly distributed so as to reduce the influence of the voltage of the driving power supply; and thirdly, compensating the gray-scale value of each sub-pixel so as to enable the whole display picture to be more uniform. However, the above-described solution is complex to implement, involving a large amount of calculations and controls.
Disclosure of Invention
The invention aims to provide a pixel brightness value compensation method to solve the problem that the existing power supply voltage output instability affects the uneven screen brightness value.
To solve the above technical problem, the present invention provides a pixel brightness value compensation method, including:
setting all pixels on a screen to display white, and adjusting the gray scale value of the white screen according to a first brightness value; measuring actual gray-scale values of a plurality of pixels on the screen, and taking the minimum actual gray-scale value in the measurement result as a second brightness value; calculating a difference value between the first brightness value and the second brightness value to obtain a first difference value;
adjusting the gray scale value of the white screen to a third brightness value again, wherein the gray scale value of the third brightness value is equal to the sum of the gray scale value of the first brightness value and the first difference value;
calculating final first color sub-pixel offset values for all pixels, final second color sub-pixel offset values for all pixels, and final third color sub-pixel offset values for all pixels;
and the pixel driving chip outputs the driving power supply voltage corresponding to the final brightness value by combining the third brightness value according to the final first color sub-pixel deviation value, the final second color sub-pixel deviation value and the final third color sub-pixel deviation value corresponding to each pixel.
Optionally, in the pixel luminance value compensation method, calculating a final first color sub-pixel offset value of all pixels, a final second color sub-pixel offset value of all pixels, and a final third color sub-pixel offset value of all pixels includes:
measuring a gray-scale value of a first color sub-pixel of the plurality of pixels, calculating an offset value of the first color sub-pixel of the plurality of pixels according to the gray-scale value of the first color sub-pixel of the plurality of pixels, and calculating a final first color sub-pixel offset value of all pixels according to the offset value of the first color sub-pixel of the plurality of pixels;
measuring a gray-scale value of a second color sub-pixel of the plurality of pixels, calculating an offset value of the second color sub-pixel of the plurality of pixels according to the gray-scale value of the second color sub-pixel of the plurality of pixels, and calculating a final second color sub-pixel offset value of all pixels according to the offset values of the second color sub-pixel of the plurality of pixels;
measuring a gray-scale value of a third color sub-pixel of the plurality of pixels, calculating an offset value of the third color sub-pixel of the plurality of pixels according to the gray-scale value of the third color sub-pixel of the plurality of pixels, and calculating a final third color sub-pixel offset value of all pixels according to the offset value of the third color sub-pixel of the plurality of pixels.
Optionally, in the pixel brightness value compensation method, the number of the plurality of pixels is N, a distance between one part of the plurality of pixels and the pixel driving chip is the smallest, and a distance between another part of the plurality of pixels and the pixel driving chip is the largest, where N is a positive integer greater than or equal to 4.
Optionally, in the pixel brightness value compensation method, the first brightness value is a maximum brightness value set when the screen is initialized after leaving a factory, and the first brightness value is set to correspond to a maximum gray scale value.
Optionally, in the pixel brightness value compensation method,
measuring the gray scale values of the first, second, or third color sub-pixels of the plurality of pixels comprises:
and for the plurality of pixels, respectively adjusting the gray-scale value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel of each pixel to M number of value points, measuring the actual gray-scale value, fitting a first brightness value curve to an Nth brightness value curve of the gray-scale value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel from 0 to the maximum gray-scale value according to the M multiplied by N actual gray-scale values, wherein M is a positive integer which is more than or equal to 4.
Optionally, in the method for compensating luminance values of pixels, calculating offset values of sub-pixels of the first color, the second color, or the third color of the plurality of pixels according to gray-scale values of sub-pixels of the first color, the second color, or the third color of the plurality of pixels includes:
for a first color, a second color or a third color, respectively obtaining a brightness value corresponding to the maximum gray scale value in a plurality of first to Nth brightness value curves of each color, and obtaining a minimum brightness value in each color;
and obtaining a gray-scale value corresponding to the minimum brightness value in the first to nth brightness value curves of each color, and dividing the gray-scale value corresponding to the minimum brightness value by the maximum gray-scale value to obtain offset values of the first color sub-pixels of the first to nth pixels of each color.
Optionally, in the pixel brightness value compensation method,
calculating a final first, second, or third color sub-pixel offset value for all pixels from the first, second, or third color sub-pixel offset values for the plurality of pixels comprises:
setting two sampling points in the same row or column with each color starting point as a first sampling point and a second sampling point of each color respectively by using a pixel where the maximum offset value in the offset values of each color sub-pixel of the first to N-th pixels is positioned as each color starting point;
according to the number of the first row of pixels between each color starting point and each color first sampling point, performing linear difference calculation on the offset value of each color sub-pixel corresponding to each color starting point and the offset value of each color sub-pixel corresponding to each color first sampling point to obtain the offset value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel of each point of the first row of pixels;
according to the number of the first column of pixels between each color starting point and each color second sampling point, performing linear difference calculation on the offset value of each color sub-pixel corresponding to each color starting point and the offset value of each color sub-pixel corresponding to each color second sampling point to obtain the offset value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel of each point of the first column of pixels;
optionally, in the pixel brightness value compensation method,
calculating final first, second, or third color sub-pixel offset values for all pixels according to the first, second, or third color sub-pixel offset values for the plurality of pixels, respectively, further comprises:
the final first color, second color or third color sub-pixel offset value of each pixel on the screen is equal to the sum of the difference between the first color, second color or third color sub-pixel offset value of the pixel in the first column of the row where the pixel is located and the first color, second color or third color sub-pixel offset value of the starting point of each color and the difference between the first color, second color or third color sub-pixel offset value of the pixel in the first row of the column where the pixel is located and the first color, second color or third color sub-pixel offset value of the starting point of each color.
Optionally, in the pixel brightness value compensation method, the first color is red, the second color is green, and the third color is blue.
Optionally, in the pixel brightness value compensation method, in each pixel, the outputting, by the pixel driving chip, the driving power voltage corresponding to the final brightness value according to the final first color sub-pixel offset value, the final second color sub-pixel offset value, and the final third color sub-pixel offset value corresponding to each pixel, in combination with the third brightness value, includes:
the final first color sub-pixel is equal to the first color sub-pixel in the third luminance value divided by the maximum gray scale value, multiplied by the final first color sub-pixel offset value, plus the first color sub-pixel in the third luminance value;
the final second-color sub-pixel is equal to the second-color sub-pixel in the third luminance value divided by the maximum gray scale value, multiplied by the final second-color sub-pixel offset value, plus the second-color sub-pixel in the third luminance value;
the final third color sub-pixel is equal to the third color sub-pixel in the third luminance value divided by the maximum gray scale value, multiplied by the final third color sub-pixel offset value, plus the third color sub-pixel in the third luminance value;
a final luminance value equal to a sum of the final first color sub-pixel, the final second color sub-pixel, and the final third color sub-pixel;
and the pixel driving chip outputs a driving power supply voltage according to the final brightness value.
In the pixel brightness value compensation method provided by the invention, the brightness value error on the screen is compensated by calculating the final first color sub-pixel deviation value, the final second color sub-pixel deviation value and the final third color sub-pixel deviation value and outputting the driving power supply voltage corresponding to the final brightness value of each pixel according to the three values, so that the problem of uneven brightness value is solved.
Drawings
FIG. 1 is a flow chart illustrating a pixel luminance value compensation method according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating 4 pixels in a pixel luminance value compensation method according to an embodiment of the present invention.
Detailed Description
The following describes the pixel brightness value compensation method according to the present invention in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide a pixel brightness value compensation method to solve the problem that the existing power supply voltage output instability affects the uneven screen brightness value.
To achieve the above idea, the present invention provides a pixel luminance value compensation method, including: setting all pixels on a screen to display white, and adjusting the gray scale value of the white screen according to a first brightness value; measuring actual gray-scale values of a plurality of pixels on the screen, and taking the minimum actual gray-scale value in the measurement result as a second brightness value; calculating a difference value between the first brightness value and the second brightness value to obtain a first difference value; adjusting the gray scale value of the white screen to a third brightness value again, wherein the gray scale value of the third brightness value is equal to the sum of the gray scale value of the first brightness value and the first difference value; calculating final first color sub-pixel offset values for all pixels, final second color sub-pixel offset values for all pixels, and final third color sub-pixel offset values for all pixels; the pixel driving chip outputs the driving power supply voltage corresponding to the final brightness value according to the final first color sub-pixel deviation value, the final second color sub-pixel deviation value and the final third color sub-pixel deviation value corresponding to each pixel and in combination with a third brightness value, wherein the final brightness value is the final brightness value obtained by adopting the pixel brightness value compensation method in the invention in order to eliminate the driving power supply voltage error and cause uneven brightness value.
The gray scale is obtained by dividing the change in luminance value between the brightest luminance and the darkest luminance into a plurality of parts. So as to control the screen brightness value corresponding to the signal input. Each digital image is composed of a plurality of dots, also called pixels (pixels), each of which can usually represent a plurality of different colors, and is composed of three sub-pixels of red, green and blue (RGB). Each sub-pixel, the light source behind it, may exhibit a different level of brightness. And the gray levels represent gradation levels of different brightness values from the darkest to the brightest. The more the intermediate levels are, the more exquisite the picture effect can be presented. Taking an 8-bit screen as an example, the screen can represent 2 to the power of 8, which is equal to 256 luminance value levels, and is called 256 gray levels. Each pixel on the OLED screen is combined by red, green and blue with different brightness value levels to finally form different color points. That is, the color change of each dot on the screen is actually caused by the gray scale change of the three RGB sub-pixels constituting the dot.
The present embodiment provides a pixel luminance value compensation method, as shown in fig. 1, the pixel luminance value compensation method includes: s1: setting all pixels on the screen to display white, and adjusting the gray scale value of the white screen according to the first brightness value; the first brightness value is a maximum brightness value to be set when the screen leaves the factory and is initialized, for example, in this embodiment, the maximum gray scale value is 255 as an example, and if the brightness value corresponding to the gray scale value 255 is 350nit, the first brightness value is set to 350 nit; s2: the actual gray-scale values of a plurality of pixels on the screen are measured, and as shown in fig. 2, P1, P2, P3 and P4 are selected. And the minimum actual gray scale value in the measurement result is taken as a second brightness value W255_ Lmin; s3: calculating a difference between the first luminance value and the second luminance value to obtain a first difference, diff1 ═ 350nit-W255_ Lmin; s4: adjusting the gray level value of the white screen to a third brightness value again, wherein the gray level value of the third brightness value is equal to the sum of the gray level value of the first brightness value and the first difference value, that is, Input is 350nit + diff1, and since it is difficult to adjust the gray level value to a higher value when performing brightness value compensation according to the offset value, before performing compensation, the gray level value of the screen is adjusted to the third brightness value, that is, the sum of the first brightness value (normal brightness value) and the first difference value (maximum error), so that the actual gray level value before compensation is higher than the gray level value of the normal brightness value, and when performing compensation, the gray level value is adjusted down according to the offset value, which is simple and convenient, and then the third brightness value is stored in the pixel driving chip; calculating the final first color sub-pixel offset values of all the pixels, the final second color sub-pixel offset values of all the pixels, and the final third color sub-pixel offset values of all the pixels, specifically including: s5: measuring a gray-scale value of a first color sub-pixel of the plurality of pixels (P1, P2, P3, and P4), calculating an offset value of the first color sub-pixel of the plurality of pixels from the gray-scale value of the first color sub-pixel of the plurality of pixels, calculating a final first color sub-pixel offset value for all pixels from the offset value of the first color sub-pixel of the plurality of pixels; s6: measuring a gray-scale value of a second color sub-pixel of the plurality of pixels, calculating an offset value of the second color sub-pixel of the plurality of pixels according to the gray-scale value of the second color sub-pixel of the plurality of pixels, and calculating a final second color sub-pixel offset value of all pixels according to the offset values of the second color sub-pixel of the plurality of pixels; s7: measuring a gray-scale value of a third color sub-pixel of the plurality of pixels, calculating an offset value of the third color sub-pixel of the plurality of pixels according to the gray-scale value of the third color sub-pixel of the plurality of pixels, and calculating a final third color sub-pixel offset value of all pixels according to the offset value of the third color sub-pixel of the plurality of pixels; the final first color sub-pixel offset value, the final second color sub-pixel offset value and the final third color sub-pixel offset value obtained through calculation are all stored in the pixel driving chip. S8: and on each pixel, the pixel driving chip outputs a driving power supply voltage corresponding to the final brightness value according to the final first color sub-pixel offset value, the final second color sub-pixel offset value and the final third color sub-pixel offset value corresponding to the pixel and in combination with the third brightness value.
Further, in the pixel brightness value compensation method, the first brightness value is a maximum brightness value set when the screen is initialized, and the first brightness value is set to correspond to a maximum gray scale value. In this embodiment, the gray scale value of the first luminance value, that is, the maximum gray scale value, is 255. The first color is red, the second color is green, and the third color is blue. The number of the plurality of pixels is N, the distance between one part of the plurality of pixels and the pixel driving chip is the smallest, the distance between the other part of the plurality of pixels and the pixel driving chip is the largest, and N is a positive integer larger than or equal to 4. As shown in fig. 2, the number of the pixels is 4, the shape of the screen is square, the pixels are respectively distributed at 4 vertex angles of the screen, and the method is also suitable for other polygons, circles and the like, and when a plurality of pixels are selected, the rule that the distance between two pixels and the pixel driving chip is the minimum and the distance between two pixels and the pixel driving chip is the maximum can be followed.
Specifically, in the pixel luminance value compensation method, measuring a gray-scale value of a first color sub-pixel of the plurality of pixels, and calculating an offset value of the first color sub-pixel of the plurality of pixels according to the gray-scale value of the first color sub-pixel of the plurality of pixels includes: for the plurality of pixels, respectively adjusting the gray-scale value of the first color sub-pixel of each pixel to M number points and measuring the actual gray-scale value, fitting a first to N brightness value curve of the gray-scale value of the first color sub-pixel of the first to N-th pixels from 0 to the maximum gray-scale value according to the M multiplied by N actual gray-scale values, wherein M is a positive integer greater than or equal to 4, the larger M is, the more accurate the fitted curve is, the larger N is, the closer the calculated final sub-pixel offset value is to other nearby pixels, therefore, the values of M and N are not less than 4, and the values of M and N are larger as the number of pixels in the screen is larger.
For example, when M ═ N ═ 4 (as shown in fig. 2): for the first pixel, respectively adjusting the gray-scale values of the first color sub-pixel of the first pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a first luminance value Curve R _ P1_ Luma _ Curve of the first color sub-pixel of the first pixel from 0 to 255 according to the 4 actual gray-scale values; for the second pixel, respectively adjusting the gray-scale values of the first color sub-pixel of the second pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a second luminance value Curve R _ P2_ Luma _ Curve of the second pixel from 0 to 255 according to the 4 actual gray-scale values; for the third pixel, respectively adjusting the gray-scale values of the first color sub-pixel of the third pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a third luminance value Curve R _ P3_ Luma _ Curve of the third pixel from 0 to 255 according to the 4 actual gray-scale values; for the fourth pixel, respectively adjusting the gray-scale values of the first color sub-pixel of the fourth pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a fourth luminance value Curve R _ P4_ Luma _ Curve of the fourth pixel from 0 to 255 according to the 4 actual gray-scale values;
respectively acquiring the brightness value corresponding to the maximum gray scale value in the first to nth brightness value curves, and acquiring the minimum brightness value therein, namely acquiring the brightness value corresponding to 255 in the first brightness value Curve R _ P1_ Luma _ Curve, the second brightness value Curve R _ P2_ Luma _ Curve, the third brightness value Curve R _ P3_ Luma _ Curve and the fourth brightness value Curve R _ P4_ Luma _ Curve, and acquiring the minimum brightness value R255_ Lmin therein;
obtaining a gray-scale value corresponding to the minimum brightness value in the first to nth brightness value curves, and dividing the gray-scale value corresponding to the minimum brightness value by a maximum gray-scale value (255 in this embodiment) to obtain offset values of the first color sub-pixels of the first to nth pixels; for example, in the first luminance value Curve R _ P1_ Luma _ Curve, a gray level value corresponding to the minimum luminance value R255_ Lmin is obtained, and the gray level value corresponding to the minimum luminance value R255_ Lmin is divided by 255 to obtain an offset value R _ P1_ Shift of the first color sub-pixel of the first pixel; obtaining a gray-scale value corresponding to the minimum brightness value R255_ Lmin from a second brightness value Curve R _ P2_ Luma _ Curve, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value R _ P2_ Shift of the first color sub-pixel of the second pixel; obtaining a gray-scale value corresponding to the minimum brightness value R255_ Lmin from a third brightness value Curve R _ P3_ Luma _ Curve, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value R _ P3_ Shift of the first color sub-pixel of the third pixel; in the fourth luminance value Curve R _ P4_ Luma _ Curve, a gray level value corresponding to the minimum luminance value R255_ Lmin is obtained, and the gray level value corresponding to the minimum luminance value is divided by 255 to obtain an offset value R _ P4_ Shift of the first color sub-pixel of the fourth pixel.
Further, in practical applications, the pixel driving chip stores the boundary offset values of 4 points, and if the resolution is p × q, i.e., p pixels in the horizontal direction and q pixels in the vertical direction. The offset values of the red, green and third color sub-pixels at 255 grayscales can be obtained by bilinear interpolation and recorded as R255_ shift, G255_ shift and B255_ shift. Specifically, calculating the final first color sub-pixel Shift value R255_ Shift for all pixels according to the Shift values R _ P1_ Shift, R _ P2_ Shift, R _ P3_ Shift, and R _ P4_ Shift for the first color sub-pixel of the plurality of pixels comprises: a pixel in which the largest offset value among the offset values of the first color sub-pixels of the first to nth pixels (in this embodiment, the offset values of the first color sub-pixels of 4 pixels are R _ P1_ Shift, R _ P2_ Shift, R _ P3_ Shift, and R _ P4_ Shift, respectively) is a first color starting point, for example, R _ P1_ Shift is the largest, P1 is the first color starting point, two sampling points in the same row or column as the first color starting point P1 are set as a first color first sampling point and a first color second sampling point, points adjacent to P1 are P2 and P3, P2 is the first color first sampling point, and P3 is the first color second sampling point, respectively; according to the number of the first row pixels between the first color starting point P1 and the first color first sampling point P2, for example, P pixels in the first row, linear difference calculation is performed on the offset value R _ P1_ Shift of the first color sub-pixel corresponding to the first color starting point and the offset value R _ P2_ Shift of the first color sub-pixel corresponding to the first color first sampling point, so as to obtain the offset value of the first color sub-pixel of each pixel in the first row of pixels; according to the number of the pixels in the first column from the first color starting point P1 to the first color second sampling point P3, performing linear difference calculation on the offset value R _ P1_ Shift of the first color sub-pixel corresponding to the first color starting point P1 and the offset value R _ P3_ Shift of the first color sub-pixel corresponding to the first color second sampling point P3 to obtain the offset value of the first color sub-pixel of each pixel in the first column; the final first color sub-pixel offset value for each pixel on the screen is equal to the sum of the difference between the first color sub-pixel offset value for the first column of pixels on the row in which it resides and the first color starting point and the difference between the first color sub-pixel offset value for the first row of pixels on the column in which it resides and the first color starting point, e.g., the ith row and jth column of pixels, their first color sub-pixel offset values:
r _ ij _ Shift ═ 2 × R _ P1_ Shift-R _ i _ Shift-R _ j _ Shift, where: r _ i _ Shift is the first color sub-pixel offset value for the ith pixel in the first row, and R _ j _ Shift is the first color sub-pixel offset value for the jth pixel in the first column.
Similarly, the method for calculating the sub-pixel offset values of the second color and the third color is similar to the first color sub-pixel offset value, and specifically, measuring the gray-scale value of the second color sub-pixel of the plurality of pixels, and calculating the offset value of the second color sub-pixel of the plurality of pixels according to the gray-scale value of the second color sub-pixel of the plurality of pixels includes: for the first pixel, respectively adjusting the gray-scale values of the second color sub-pixel of the first pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a first brightness value curve of the gray-scale values of the second color sub-pixel of the first pixel from 0 to 255 according to the 4 actual gray-scale values; for the second pixel, respectively adjusting the gray-scale values of the second color sub-pixel of the second pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a second brightness value curve of the gray-scale values of the second color sub-pixel of the second pixel from 0 to 255 according to the 4 actual gray-scale values; for the third pixel, respectively adjusting the gray-scale values of the second color sub-pixel of the third pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a third brightness value curve of the third pixel from 0 to 255 according to the 4 actual gray-scale values; for the fourth pixel, respectively adjusting the gray-scale values of the second color sub-pixel of the fourth pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a brightness value curve of the gray-scale values of the second color sub-pixel of the fourth pixel from 0 to 255 according to the 4 actual gray-scale values; respectively obtaining brightness values corresponding to the maximum gray scale values in the first brightness value curve, the second brightness value curve, the third brightness value curve and the fourth brightness value curve, and obtaining the minimum brightness value; in the first brightness value curve, obtaining a gray-scale value corresponding to the minimum brightness value, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value of the second color sub-pixel of the first pixel; in a second brightness value curve, obtaining a gray-scale value corresponding to the minimum brightness value, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value of a second color sub-pixel of a second pixel; in a third luminance value curve, obtaining a gray-scale value corresponding to the minimum luminance value, and dividing the gray-scale value corresponding to the minimum luminance value by 255 to obtain an offset value of a second color sub-pixel of a third pixel; and in a fourth brightness value curve, obtaining a gray-scale value corresponding to the minimum brightness value, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value of the second color sub-pixel of the fourth pixel.
Further, in the pixel luminance value compensation method, calculating a final second-color sub-pixel offset value G255_ shift of all pixels according to the offset values of the second-color sub-pixels of the plurality of pixels includes: setting two sampling points in the same row or column with the second color starting point as a second color first sampling point and a second color second sampling point respectively by using a pixel where the maximum offset value in the offset values of the second color sub-pixels of 4 pixels is positioned as the second color starting point; according to the number of the first row of pixels between the second color starting point and the second color first sampling point, performing linear difference calculation on the offset value of the second color sub-pixel corresponding to the second color starting point and the offset value of the second color sub-pixel corresponding to the second color first sampling point, so as to obtain the offset value of the second color sub-pixel of each point of the first row of pixels; according to the number of the first row of pixels between the second color starting point and the second sampling point of the second color, performing linear difference calculation on the offset value of the second color sub-pixel corresponding to the second color starting point and the offset value of the second color sub-pixel corresponding to the second sampling point of the second color, so as to obtain the offset value of the second color sub-pixel of each point of the first row of pixels; the final second color sub-pixel offset value for each pixel on the screen is equal to the sum of the difference between the second color sub-pixel offset value for the first column of pixels on the row in which it is located and the second color starting point second color sub-pixel offset value and the difference between the second color sub-pixel offset value for the first column of pixels on the column in which it is located and the second color starting point second color sub-pixel offset value.
Further, in the pixel luminance value compensation method, measuring a gray-scale value of a third color sub-pixel of the plurality of pixels, and calculating an offset value of the third color sub-pixel of the plurality of pixels according to the gray-scale value of the third color sub-pixel of the plurality of pixels includes: for the first pixel, respectively adjusting the gray-scale values of the third color sub-pixel of the first pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a first brightness value curve of the gray-scale values of the third color sub-pixel of the first pixel from 0 to 255 according to the 4 actual gray-scale values; for the second pixel, respectively adjusting the gray-scale values of the third color sub-pixel of the second pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a second brightness value curve of the gray-scale values of the third color sub-pixel of the second pixel from 0 to 255 according to the 4 actual gray-scale values; for the third pixel, respectively adjusting the gray-scale values of the third color sub-pixel of the third pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a third luminance value curve of the third color sub-pixel of the third pixel from 0 to 255 according to the 4 actual gray-scale values; for the fourth pixel, respectively adjusting the gray-scale values of the third color sub-pixel of the fourth pixel to 32, 64, 128 and 255 and measuring the actual gray-scale values, and fitting a brightness value curve of the fourth pixel from 0 to 255 according to the 4 actual gray-scale values; respectively obtaining brightness values corresponding to the maximum gray scale values of the first brightness value curve, the second brightness value curve, the third brightness value curve and the fourth brightness value curve, and obtaining the minimum brightness value; in the first brightness value curve, obtaining a gray-scale value corresponding to the minimum brightness value, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value of a third color sub-pixel of the first pixel; in a second brightness value curve, obtaining a gray-scale value corresponding to the minimum brightness value, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value of a third color sub-pixel of the second pixel; in a third luminance value curve, obtaining a gray-scale value corresponding to the minimum luminance value, and dividing the gray-scale value corresponding to the minimum luminance value by 255 to obtain an offset value of a third color sub-pixel of a third pixel; and in a fourth brightness value curve, obtaining a gray-scale value corresponding to the minimum brightness value, and dividing the gray-scale value corresponding to the minimum brightness value by 255 to obtain an offset value of a third color sub-pixel of a fourth pixel.
Finally, calculating a final third-color sub-pixel offset value B255_ shift for all pixels according to the offset values for the third-color sub-pixels of the plurality of pixels comprises: setting a pixel where the maximum offset value in the offset values of the third color sub-pixels of the 4 pixels is located as a third color starting point, and setting two sampling points of the third color starting point as a third color first sampling point and a third color second sampling point respectively; according to the number of the first row of pixels between the third color starting point and the third color first sampling point, performing linear difference value calculation on the offset value of the third color sub-pixel corresponding to the third color starting point and the offset value of the third color sub-pixel corresponding to the third color first sampling point, so as to obtain the offset value of the third color sub-pixel of each point of the first row of pixels; according to the number of the first row of pixels between the third color starting point and the third color second sampling point, performing linear difference calculation on the offset value of the third color sub-pixel corresponding to the third color starting point and the offset value of the third color sub-pixel corresponding to the third color second sampling point to obtain the offset value of the third color sub-pixel of each point of the first row of pixels; the final third color sub-pixel offset value for each pixel on the screen is equal to the sum of the difference between the third color sub-pixel offset value for the first column of pixels on the row in which it resides and the third color sub-pixel offset value for the third color starting point and the difference between the third color sub-pixel offset value for the first row of pixels on the column in which it resides and the third color starting point third color sub-pixel offset value.
In addition, in each pixel, the outputting, by the pixel driving chip, the driving power voltage corresponding to the final luminance value according to the final first color sub-pixel offset value, the final second color sub-pixel offset value, and the final third color sub-pixel offset value corresponding to each pixel, in combination with the third luminance value, includes:
the final first color sub-pixel Output _ R is equal to the first color sub-pixel Input _ R in the third luminance value divided by 255, multiplied by a final first color sub-pixel offset value R255_ shift, and added to the first color sub-pixel Input _ R in the third luminance value;
the final second-color sub-pixel Output _ G is equal to the second-color sub-pixel Input _ G in the third luminance value divided by 255, multiplied by a final second-color sub-pixel offset value G255_ shift, and added to the second-color sub-pixel Input _ G in the third luminance value;
the final third color sub-pixel Output _ B is equal to the third color sub-pixel Input _ B in the third luminance value divided by 255, multiplied by a final third color sub-pixel offset value B255_ shift, and added to the third color sub-pixel Input _ B in the third luminance value;
the final brightness value is equal to the sum of the final first color sub-pixel, the final second color sub-pixel and the final third color sub-pixel, and Output is Output _ R + Output _ G + Output _ B; and the pixel driving chip outputs a driving power supply voltage according to the final brightness value.
Specifically, the offset value of the current gray level is obtained according to the signal input from the front end:
Current_R_Diff＝(Input_R/255)*R255_shift
the same results in Current _ G _ Diff and Current _ B _ Diff. And obtaining a new gray-scale value after calculation, and outputting a picture.
Input_R+Current_R_Diff＝Output_R
Output _ G and Output _ B are obtained in the same way.
In the pixel brightness value compensation method provided by the invention, the brightness value error on the screen is compensated by calculating the final first color sub-pixel deviation value, the final second color sub-pixel deviation value and the final third color sub-pixel deviation value and outputting the driving power supply voltage corresponding to the final brightness value of each pixel according to the three values, so that the problem of uneven brightness value is solved.
In summary, the above embodiments describe the different schemes of the pixel luminance value compensation method in detail, and it is needless to say that the present invention includes but is not limited to the configurations listed in the above embodiments, and any modifications based on the configurations provided by the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
Claims (10)
1. A pixel luminance value compensation method, comprising:
setting all pixels on a screen to display white, and adjusting the gray scale value of the white screen according to a first brightness value; measuring actual gray-scale values of a plurality of pixels on the screen, and taking the minimum actual gray-scale value in the measurement result as a second brightness value; calculating a difference value between the first brightness value and the second brightness value to obtain a first difference value;
adjusting the gray scale value of the white screen to a third brightness value again, wherein the gray scale value of the third brightness value is equal to the sum of the gray scale value of the first brightness value and the first difference value;
calculating final first color sub-pixel offset values for all pixels, final second color sub-pixel offset values for all pixels, and final third color sub-pixel offset values for all pixels;
and the pixel driving chip outputs the driving power supply voltage corresponding to the final brightness value by combining the third brightness value according to the final first color sub-pixel deviation value, the final second color sub-pixel deviation value and the final third color sub-pixel deviation value corresponding to each pixel.
2. A pixel luminance value compensation method as claimed in claim 1, wherein calculating the final first color sub-pixel offset values for all pixels, the final second color sub-pixel offset values for all pixels and the final third color sub-pixel offset values for all pixels comprises:
measuring a gray-scale value of a first color sub-pixel of the plurality of pixels, calculating an offset value of the first color sub-pixel of the plurality of pixels according to the gray-scale value of the first color sub-pixel of the plurality of pixels, and calculating a final first color sub-pixel offset value of all pixels according to the offset value of the first color sub-pixel of the plurality of pixels;
measuring a gray-scale value of a second color sub-pixel of the plurality of pixels, calculating an offset value of the second color sub-pixel of the plurality of pixels according to the gray-scale value of the second color sub-pixel of the plurality of pixels, and calculating a final second color sub-pixel offset value of all pixels according to the offset values of the second color sub-pixel of the plurality of pixels;
measuring a gray-scale value of a third color sub-pixel of the plurality of pixels, calculating an offset value of the third color sub-pixel of the plurality of pixels according to the gray-scale value of the third color sub-pixel of the plurality of pixels, and calculating a final third color sub-pixel offset value of all pixels according to the offset value of the third color sub-pixel of the plurality of pixels.
3. A pixel brightness value compensation method according to claim 2, wherein the number of the plurality of pixels is N, a part of the plurality of pixels has the smallest distance to the pixel driving chip, and another part of the plurality of pixels has the largest distance to the pixel driving chip, where N is a positive integer greater than or equal to 4.
4. The method as claimed in claim 3, wherein the first luminance value is a maximum luminance value set at factory initialization of the screen, and the first luminance value is set to correspond to a maximum gray scale value.
5. A pixel luminance value compensation method as claimed in claim 4,
measuring the gray scale values of the first, second, or third color sub-pixels of the plurality of pixels comprises:
and for the plurality of pixels, respectively adjusting the gray-scale value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel of each pixel to M number of value points, measuring the actual gray-scale value, fitting a first brightness value curve to an Nth brightness value curve of the gray-scale value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel from 0 to the maximum gray-scale value according to the M multiplied by N actual gray-scale values, wherein M is a positive integer which is more than or equal to 4.
6. A pixel luminance value compensation method as claimed in claim 5, wherein calculating the offset value of the first color, second color or third color sub-pixel of the plurality of pixels according to the gray scale value of the first color, second color or third color sub-pixel of the plurality of pixels comprises:
for a first color, a second color or a third color, respectively obtaining a brightness value corresponding to the maximum gray scale value in a plurality of first to Nth brightness value curves of each color, and obtaining a minimum brightness value in each color;
and obtaining a gray-scale value corresponding to the minimum brightness value in the first to nth brightness value curves of each color, and dividing the gray-scale value corresponding to the minimum brightness value by the maximum gray-scale value to obtain offset values of the first color sub-pixels of the first to nth pixels of each color.
7. A pixel luminance value compensation method as claimed in claim 6,
calculating a final first, second, or third color sub-pixel offset value for all pixels from the first, second, or third color sub-pixel offset values for the plurality of pixels comprises:
setting two sampling points in the same row or column with each color starting point as a first sampling point and a second sampling point of each color respectively by using a pixel where the maximum offset value in the offset values of each color sub-pixel of the first to N-th pixels is positioned as each color starting point;
according to the number of the first row of pixels between each color starting point and each color first sampling point, performing linear difference calculation on the offset value of each color sub-pixel corresponding to each color starting point and the offset value of each color sub-pixel corresponding to each color first sampling point to obtain the offset value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel of each point of the first row of pixels;
and according to the number of the first column of pixels between each color starting point and each color second sampling point, performing linear difference calculation on the offset value of each color sub-pixel corresponding to each color starting point and the offset value of each color sub-pixel corresponding to each color second sampling point to obtain the offset value of the first color sub-pixel, the second color sub-pixel or the third color sub-pixel of each point of the first column of pixels.
8. A pixel luminance value compensation method as claimed in claim 7,
calculating final first, second, or third color sub-pixel offset values for all pixels according to the first, second, or third color sub-pixel offset values for the plurality of pixels, respectively, further comprises:
the final first color, second color or third color sub-pixel offset value of each pixel on the screen is equal to the sum of the difference between the first color, second color or third color sub-pixel offset value of the pixel in the first column of the row where the pixel is located and the first color, second color or third color sub-pixel offset value of the starting point of each color and the difference between the first color, second color or third color sub-pixel offset value of the pixel in the first row of the column where the pixel is located and the first color, second color or third color sub-pixel offset value of the starting point of each color.
9. A pixel luminance value compensation method as claimed in claim 1, wherein the first color is red, the second color is green, and the third color is blue.
10. The method as claimed in claim 4, wherein the outputting, by the pixel driving chip, the driving power voltage corresponding to the final luminance value according to the final first color sub-pixel offset value, the final second color sub-pixel offset value and the final third color sub-pixel offset value corresponding to each pixel, in combination with the third luminance value, comprises:
the final first color sub-pixel is equal to the first color sub-pixel in the third luminance value divided by the maximum gray scale value, multiplied by the final first color sub-pixel offset value, plus the first color sub-pixel in the third luminance value;
the final second-color sub-pixel is equal to the second-color sub-pixel in the third luminance value divided by the maximum gray scale value, multiplied by the final second-color sub-pixel offset value, plus the second-color sub-pixel in the third luminance value;
the final third color sub-pixel is equal to the third color sub-pixel in the third luminance value divided by the maximum gray scale value, multiplied by the final third color sub-pixel offset value, plus the third color sub-pixel in the third luminance value;
a final luminance value equal to a sum of the final first color sub-pixel, the final second color sub-pixel, and the final third color sub-pixel;
and the pixel driving chip outputs a driving power supply voltage according to the final brightness value.
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| CN110570817A (en) * | 2019-09-18 | 2019-12-13 | 广东晟合技术有限公司 | AMOLED pixel uniformity compensation method |
| CN110599943B (en) * | 2019-10-25 | 2023-05-30 | 京东方科技集团股份有限公司 | Display panel pixel compensation method and compensation device and display panel |
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