CN116524858A - Display non-uniformity compensation method for display screen - Google Patents
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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]
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
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Abstract
The invention discloses a display non-uniformity compensation method of a display screen, which relates to the field of compensation control of display equipment and comprises the following steps: establishing a display screen predistortion detection system formed by an image sensor and an adaptive feedback compensation module; detecting real driving values required by uniformly displaying different pixel values at each pixel point of a display screen through a display screen predistortion detection system, and taking the real driving values as a predistortion data set; curve fitting is carried out on the predistortion data set, so that a predistortion function is obtained; and correcting the driving value of each pixel point of the display screen for displaying the image through the predistortion function so as to perform uniform display. The invention realizes accurate compensation without adding extra hardware, so that the display screen can uniformly display and has excellent display effect.
Description
Technical Field
The invention relates to the field of compensation control of display equipment, in particular to a display non-uniformity compensation method of a display screen.
Background
With the development of LED (Light Emitting Diode ) technology, display screens have transitioned to the age of OLED (Organic Light Emitting Diode, organic electroluminescent diode) display screen technology. The OLED display screen is composed of a plurality of rows and columns of pixel points, and each pixel point comprises at least one red light LED, one green light LED and one blue light LED. In the working state of the display screen, the luminous intensities of red LEDs, green LEDs and blue LEDs of corresponding pixel points of the display screen are respectively adjusted according to red components (R), green components (G) and blue components (B) of pixel values (pixel values of an RGB coding format in an image so as to display the image.
However, due to poor LED identity, different pixels of the display screen emit light with different brightness under the same driving condition, so that the display screen has a problem of uneven display, and display unevenness needs to be compensated.
The display non-uniformity compensation mode without adding hardware equipment is that the relation between the luminescence and the driving value of each LED is obtained by testing in advance, the pixel value of the image is pre-distorted, so that the image can be uniformly displayed, but the existing display non-uniformity compensation technology generally only considers the gray scale and the blemish of the severely distorted pixel point, and does not accurately correct the problem of poor display effect caused by the problem of LED identity.
Disclosure of Invention
Aiming at the defects in the prior art, the display non-uniformity compensation method for the display screen solves the problem that the correction precision of the display non-uniformity compensation method for the existing display screen is poor.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a display non-uniformity compensation method of a display screen comprises the following steps:
s1, establishing a display screen predistortion detection system formed by an image sensor and an adaptive feedback compensation module;
s2, detecting real driving values required by uniformly displaying different pixel values of each pixel point of a display screen through a display screen predistortion detection system, and taking the real driving values as a predistortion data set;
s3, curve fitting is carried out on the predistortion data set, and a predistortion function is obtained;
s4, correcting driving values of each pixel point of the display screen for displaying the image through the predistortion function so as to perform uniform display.
Further, the resolution of the image sensor is greater than or equal to the resolution of the display screen.
Further, the step S2 includes the following sub-steps:
s21, setting a plurality of test images to be displayed on a display screen, wherein the pixel values of the test images are different, each test image is a single-color image with congruent internal pixel values, and the colors of the single-color images comprise red, green and blue;
s22, displaying each test image through a display screen, and detecting real driving values required by uniform display of each pixel point of the display screen through a display screen predistortion detection system for each display process to form a predistortion matrix corresponding to each test image, so as to obtain predistortion matrix pairs of each test image;
and S23, summarizing all the test image predistortion matrix pairs into a predistortion data set.
Further, in S22, for each display process, the method for detecting the real driving value required by uniformly displaying each pixel point of the display screen through the display screen predistortion detection system includes the following steps:
a1, capturing actual pixel values of all pixel points when a display screen displays a test image through an image sensor;
a2, calculating a pixel error value between the actual pixel value and the pixel value in the test image;
a3, according to the pixel error value, each pixel point of the display screen is fed back and adjusted through the self-adaptive feedback compensation module until the pixel error value is 0, and a real driving value required by uniform display of each pixel point of the display screen is obtained.
Further, the adaptive feedback compensation module is operated with an adaptive feedback compensation model, and the expression of the adaptive feedback compensation model is as follows:
，
，
wherein ,for adaptive feedback compensation model +.>The drive value used is sub-regulated, +.>For adaptive feedback compensation model +.>The drive value used is sub-regulated, +.>Model number for adaptive feedback compensationPixel error value at sub-adjustment, +.>For adaptive feedback compensation model +.>Pixel error value at sub-adjustment, +.>Is->Feedback coefficient, < >>Is a closed interval->Positive integer in>Is of circumference rate>Is a first class Bessel function of order 0.
Further, the predistortion function includes: a red predistortion function, a green predistortion function and a blue predistortion function.
Further, the step S3 includes the steps of:
s31, classifying each test image predistortion matrix pair into a red predistortion data set, a green predistortion data set and a blue predistortion data set according to the color of each test image in the predistortion data set;
s32, respectively performing curve fitting on real driving values of a red LED, a green LED and a blue LED of each pixel point of the display screen according to the red predistortion data set, the green predistortion data set and the blue predistortion data set to obtain a red predistortion function, a green predistortion function and a blue predistortion function.
Further, the expressions of the red predistortion function, the green predistortion function and the blue predistortion function are respectively:
，
，
，
wherein ,for display screen->Go->Real driving value of column pixel red LED, < ->For display screen->Go->Column pixel red LED +.>Order correction factor->For the image to be displayed +.>Go->Red component of column pixel value, +.>To correct the order>For display screen->Go->True driving value of column pixel green LED, < ->For display screen->Go->Column pixel green LED +.>Order correction factor->For the image to be displayed +.>Go->Green component of column pixel value, +.>For display screen->Go->The true driving value of the column pixel point blue LED,>for display screen->Go->Column pixel dot blue LED +.>Order correction factor->For the image to be displayed +.>Go->Blue component of column pixel values.
Further, the curve fitting method in S32 is to perform iterative training of each correction coefficient until the correction coefficient converges by the following formulas:
，
，
，
wherein ,is->Display screen +.>Go->Column pixel red LED +.>Order correction factor->Is->Display screen +.>Go->Column pixel red LED +.>Order correction factor->For iterative step length +.>Reference to the red predistortion dataset +.>Predistortion moment for multiple iteration trainingArray->Go->Column value, +.>Is->Display screen calculated at multiple iterations +.>Go->Real driving value of column pixel red LED, < ->Reference to the red predistortion dataset +.>Test image of the iterative training +.>Go->Column value, +.>Is->Display screen +.>Go->Column pixel green LED +.>Order correction factor->Is->Display screen +.>Go->Column pixel green LED +.>The correction coefficient of the order is used to determine,reference to the green predistortion dataset +.>Predistortion matrix of iterative training +.>Go->Column value, +.>Is->Display screen calculated at multiple iterations +.>Go->True driving value of column pixel green LED, < ->Reference to the green predistortion dataset +.>Test image of the iterative training +.>Go->The value of the column is used to determine,is->Display screen +.>Go->Column pixel dot blue LED +.>The correction coefficient of the order is used to determine,is->Display screen +.>Go->Column pixel dot blue LED +.>The correction coefficient of the order is used to determine,reference to the blue predistortion dataset +.>Predistortion matrix of iterative training +.>Go->The value of the column is used to determine,is->Display screen calculated at multiple iterations +.>Go->The true drive value of the column pixel point blue LED,reference to the blue predistortion dataset +.>Test image of the iterative training +.>Go->Column values.
The beneficial effects of the invention are as follows:
(1) The display screen predistortion detection system with the self-adaptive feedback compensation module is used for accurately obtaining real driving values required by each pixel point of the display screen when different pixel values are displayed, and a predistortion function is established according to the data so as to correct the driving values of each pixel point of the display screen for displaying images, so that accurate compensation is realized under the condition that hardware is not additionally increased, the display screen can uniformly display, and excellent display effect is presented.
(2) The resolution of the image sensor is larger than or equal to that of the display screen, so that the display condition of each pixel point of the display screen can be collected by the image sensor.
(3) The red, green and blue monochromatic images are images with pixel values of R component, G component or B component, and the red light LED, the green light LED and the blue light LED of each pixel point of the display screen can be detected through the images respectively.
(4) The self-adaptive feedback compensation model designed by the invention adopts 3 historical pixel error values, and the driving value is updated in an incremental way by a feedback coefficient weighting mode, so that the display error is finally zeroed. The 3 feedback coefficients are called 0-order first-class Bessel functions by the latest pixel error value, so that the amplitude of the 3 feedback coefficients is small like passband fluctuation, the transition band is a narrow filter window, and parameters are flexibly adjustable by pixel errors, so that the adjustment of the adaptive feedback compensation can be quickly converged.
(5) The predistortion function adopts a high-order number form, has good curve fitting capability, and can fit a complex curve, so that the relationship between a complex independent variable and a dependent variable is represented; and a parameter training mode of controlling error feedback amplitude by iteration step length is designed, and correction coefficients of each step are trained, so that the corresponding relation between required driving values of LEDs of each color of each pixel point of the display screen and color components of an image to be displayed is obtained.
Drawings
Fig. 1 is a flowchart of a display non-uniformity compensation method for a display screen according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, in one embodiment of the present invention, a display non-uniformity compensation method for a display screen includes the steps of:
s1, a display screen predistortion detection system formed by an image sensor and an adaptive feedback compensation module is established.
The resolution of the image sensor is greater than or equal to the resolution of the display screen.
The resolution of the image sensor is larger than or equal to that of the display screen, so that the display condition of each pixel point of the display screen can be collected by the image sensor.
S2, detecting real driving values required by uniformly displaying different pixel values of each pixel point of the display screen through the display screen predistortion detection system, and taking the real driving values as a predistortion data set.
S2 comprises the following substeps:
s21, setting a plurality of test images to be displayed on a display screen, wherein the pixel values of the test images are different, each test image is a single-color image with congruent internal pixel values, and the colors of the single-color images comprise red, green and blue.
The red, green and blue monochromatic images are images with pixel values of R component, G component or B component, and the red light LED, the green light LED and the blue light LED of each pixel point of the display screen can be detected through the images respectively.
S22, displaying each test image through a display screen, and detecting real driving values required by uniform display of each pixel point of the display screen through a display screen predistortion detection system to form a predistortion matrix corresponding to each test image to obtain a predistortion matrix pair of each test image.
In S22, for each display process, the method for detecting the real driving value required by uniformly displaying each pixel point of the display screen through the display screen predistortion detection system comprises the following steps:
a1, capturing actual pixel values of all pixel points when the display screen displays the test image through the image sensor.
A2, calculating a pixel error value between the actual pixel value and the pixel value inside the test image.
A3, according to the pixel error value, each pixel point of the display screen is fed back and adjusted through the self-adaptive feedback compensation module until the pixel error value is 0, and a real driving value required by uniform display of each pixel point of the display screen is obtained.
The adaptive feedback compensation module is operated with an adaptive feedback compensation model, and the expression of the adaptive feedback compensation model is as follows:
，
，
wherein ,for adaptive feedback compensation model +.>The drive value used is sub-regulated, +.>For adaptive feedback compensation model +.>The drive value used is sub-regulated, +.>Model number for adaptive feedback compensationPixel error value at sub-adjustment, +.>For adaptive feedback compensation model +.>Pixel error value at sub-adjustment, +.>Is->Feedback coefficient, < >>Is a closed interval->Positive integer in>Is of circumference rate>Is a first class Bessel function of order 0.
The self-adaptive feedback compensation model designed by the invention adopts 3 historical pixel error values, and the driving value is updated in an incremental way by a feedback coefficient weighting mode, so that the display error is finally zeroed. The 3 feedback coefficients are called 0-order first-class Bessel functions by the latest pixel error value, so that the amplitude of the 3 feedback coefficients is small like passband fluctuation, the transition band is a narrow filter window, and parameters are flexibly adjustable by pixel errors, so that the adjustment of the adaptive feedback compensation can be quickly converged.
And S23, summarizing all the test image predistortion matrix pairs into a predistortion data set.
And S3, performing curve fitting on the predistortion data set to obtain a predistortion function.
The predistortion function includes: a red predistortion function, a green predistortion function and a blue predistortion function.
S3 comprises the following steps:
s31, classifying each test image predistortion matrix pair into a red predistortion data set, a green predistortion data set and a blue predistortion data set according to the color of each test image in the predistortion data set;
s32, respectively performing curve fitting on real driving values of a red LED, a green LED and a blue LED of each pixel point of the display screen according to the red predistortion data set, the green predistortion data set and the blue predistortion data set to obtain a red predistortion function, a green predistortion function and a blue predistortion function.
The expressions of the red predistortion function, the green predistortion function and the blue predistortion function are respectively:
，
，
，
wherein ,for display screen->Go->Real driving value of column pixel red LED, < ->For display screen->Go->Column pixel red LED +.>Order correction factor->For the image to be displayed +.>Go->Red component of column pixel value, +.>To correct the order>For display screen->Go->True driving value of column pixel green LED, < ->For display screen->Go->Column pixel green LED +.>Order correction factor->For the image to be displayed +.>Go->Green component of column pixel value, +.>For display screen->Go->The true driving value of the column pixel point blue LED,>for display screen->Go->Column pixel dot blue LED +.>Order correction factor->For the image to be displayed +.>Go->Blue component of column pixel values.
The method of curve fitting in S32 is to perform iterative training of various correction coefficients to converge by the following formulas:
，
，
，
wherein ,is->Display screen +.>Go->Column pixel red LED +.>Order correction factor->Is->Display screen +.>Go->Column pixel red LED +.>Order correction factor->For iterative step length +.>Reference to the red predistortion dataset +.>Predistortion matrix of iterative training +.>Go->Column value, +.>Is->Display screen calculated at multiple iterations +.>Go->True driving of column pixel point red LEDDynamic value (I)>Reference to the red predistortion dataset +.>Test image of the iterative training +.>Go->Column value, +.>Is->Display screen +.>Go->Column pixel green LED +.>Order correction factor->Is->Display screen +.>Go->Column pixel green LED +.>The correction coefficient of the order is used to determine,reference to the green predistortion dataset +.>Predistortion matrix of iterative training +.>Go->Column value, +.>Is->Display screen calculated at multiple iterations +.>Go->True driving value of column pixel green LED, < ->Reference to the green predistortion dataset +.>Test image of the iterative training +.>Go->The value of the column is used to determine,is->Display screen +.>Go->Column pixel dot blue LED +.>The correction coefficient of the order is used to determine,is->Display screen +.>Go->Column pixel dot blue LED +.>The correction coefficient of the order is used to determine,reference to the blue predistortion dataset +.>Predistortion matrix of iterative training +.>Go->The value of the column is used to determine,is->Display screen calculated at multiple iterations +.>Go->The true drive value of the column pixel point blue LED,reference to the blue predistortion dataset +.>Test image of the iterative training +.>Go->Column values.
The predistortion function adopts a high-order number form, has good curve fitting capability, and can fit a complex curve, so that the relationship between a complex independent variable and a dependent variable is represented; and a parameter training mode of controlling error feedback amplitude by iteration step length is designed, and correction coefficients of each step are trained, so that the corresponding relation between required driving values of LEDs of each color of each pixel point of the display screen and color components of an image to be displayed is obtained.
S4, correcting driving values of each pixel point of the display screen for displaying the image through the predistortion function so as to perform uniform display.
In summary, the display screen predistortion detection system with the adaptive feedback compensation module accurately obtains the real driving values required by each pixel point of the display screen when displaying different pixel values, and establishes the predistortion function according to the data so as to correct the driving values of each pixel point of the display screen for displaying images, thereby realizing accurate compensation without adding extra hardware, enabling the display screen to uniformly display and presenting excellent display effect.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (9)
1. The display non-uniformity compensation method for the display screen is characterized by comprising the following steps of:
s1, establishing a display screen predistortion detection system formed by an image sensor and an adaptive feedback compensation module;
s2, detecting real driving values required by uniformly displaying different pixel values of each pixel point of a display screen through a display screen predistortion detection system, and taking the real driving values as a predistortion data set;
s3, curve fitting is carried out on the predistortion data set, and a predistortion function is obtained;
s4, correcting driving values of each pixel point of the display screen for displaying the image through the predistortion function so as to perform uniform display.
2. The display unevenness compensation method of the display screen according to claim 1, wherein a resolution of the image sensor is equal to or larger than a resolution of the display screen.
3. The display unevenness compensation method of the display screen according to claim 2, wherein S2 comprises the following sub-steps:
s21, setting a plurality of test images to be displayed on a display screen, wherein the pixel values of the test images are different, each test image is a single-color image with congruent internal pixel values, and the colors of the single-color images comprise red, green and blue;
s22, displaying each test image through a display screen, and detecting real driving values required by uniform display of each pixel point of the display screen through a display screen predistortion detection system for each display process to form a predistortion matrix corresponding to each test image, so as to obtain predistortion matrix pairs of each test image;
and S23, summarizing all the test image predistortion matrix pairs into a predistortion data set.
4. The method for compensating for display unevenness of a display screen according to claim 3, wherein the step of detecting, for each display process in S22, a true driving value required for uniform display of each pixel point of the display screen by the display screen predistortion detection system comprises the steps of:
a1, capturing actual pixel values of all pixel points when a display screen displays a test image through an image sensor;
a2, calculating a pixel error value between the actual pixel value and the pixel value in the test image;
a3, according to the pixel error value, each pixel point of the display screen is fed back and adjusted through the self-adaptive feedback compensation module until the pixel error value is 0, and a real driving value required by uniform display of each pixel point of the display screen is obtained.
5. The method for compensating for display non-uniformity of a display screen according to claim 4, wherein an adaptive feedback compensation model is operated on said adaptive feedback compensation module, and an expression of said adaptive feedback compensation model is:
，
，
wherein ,for adaptive feedback compensation model +.>Sub-regulating driveDynamic value (I)>For adaptive feedback compensation model +.>The drive value used is sub-regulated, +.>For adaptive feedback compensation model +.>Pixel error value at sub-adjustment, +.>For adaptive feedback compensation model +.>Pixel error values at the time of the sub-adjustment,is->Feedback coefficient, < >>Is a closed interval->Positive integer in>Is of circumference rate>Is a first class Bessel function of order 0.
6. The display non-uniformity compensation method according to claim 5, wherein said predistortion function comprises: a red predistortion function, a green predistortion function and a blue predistortion function.
7. The display unevenness compensation method of the display screen according to claim 6, wherein S3 comprises the steps of:
s31, classifying each test image predistortion matrix pair into a red predistortion data set, a green predistortion data set and a blue predistortion data set according to the color of each test image in the predistortion data set;
s32, respectively performing curve fitting on real driving values of a red LED, a green LED and a blue LED of each pixel point of the display screen according to the red predistortion data set, the green predistortion data set and the blue predistortion data set to obtain a red predistortion function, a green predistortion function and a blue predistortion function.
8. The display non-uniformity compensation method according to claim 7, wherein expressions of the red predistortion function, the green predistortion function and the blue predistortion function are respectively:
，
，
，
wherein ,for display screen->Go->Real driving value of column pixel red LED, < ->For display screen->Go->Column pixel red LED +.>Order correction factor->For the image to be displayed +.>Go->Red component of column pixel value, +.>To correct the order>For display screen->Go->The true drive value of the column pixel green LEDs,for display screen->Go->Column pixel green LED +.>Order correction factor->For the image to be displayed +.>Go->Green component of column pixel value, +.>For display screen->Go->The true drive value of the column pixel point blue LED,for display screen->Go->Column pixel dot blue LED +.>Order correction factor->To be displayed image firstGo->Blue component of column pixel values.
9. The method for compensating for display non-uniformity of a display screen according to claim 8, wherein said curve fitting in S32 is performed by performing iterative training of correction coefficients to converge by:
，
，
，
wherein ,is->Display screen +.>Go->Column pixel red LED +.>Order correction factor->Is->Display screen +.>Go->Column pixel red LED +.>Order correction factor->For iterative step length +.>Reference to the red predistortion dataset +.>Predistortion matrix of iterative training +.>Row of linesColumn value, +.>Is->Display screen calculated at multiple iterations +.>Go->Real driving value of column pixel red LED, < ->Reference to the red predistortion dataset +.>Test image of the iterative training +.>Go->The value of the column is used to determine,is->Display screen +.>Go->Column pixel green LED +.>The correction coefficient of the order is used to determine,is->Display screen +.>Go->Column pixel green LED +.>The correction coefficient of the order is used to determine,reference to the green predistortion dataset +.>Predistortion matrix of iterative training +.>Go->Column value, +.>Is->Display screen calculated at multiple iterations +.>Go->True driving value of column pixel green LED, < ->Reference to the green predistortion dataset +.>Test image of the iterative training +.>Go->The value of the column is used to determine,is->Display screen +.>Go->Column pixel dot blue LED +.>The correction coefficient of the order is used to determine,is->Display screen +.>Go->Column pixel dot blue LED +.>The correction coefficient of the order is used to determine,reference to the blue predistortion dataset +.>Predistortion matrix of iterative training +.>Go->The value of the column is used to determine,is->Display screen calculated at multiple iterations +.>Go->The true drive value of the column pixel point blue LED,reference to the blue predistortion dataset +.>Test image of the iterative training +.>Go->Column values.
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