CN-122024670-A - Pixel unit brightness correction method, system, medium, program and electronic terminal

CN122024670ACN 122024670 ACN122024670 ACN 122024670ACN-122024670-A

Abstract

The application provides a brightness correction method, a system, a medium, a program and an electronic terminal of a pixel unit, by measuring the actual brightness and color coordinates of the pixel unit, and the actual brightness of each primary color element containing the actual capacitive coupling effect is calculated by combining the color coordinates of each primary color element in an inversion way. Based on the actual brightness of each primary color element, a mapping relation between the theoretical brightness and the actual brightness is established. According to the method, actual brightness of each primary color unit is not required to be measured, color shift caused by different states in traditional calibration is avoided, secondary compensation is not required, calibration precision and efficiency are considered, the problem of gray jump is solved, and gray scale continuity of a high-resolution screen is ensured.

Inventors

WANG HUAFENG
XIANG JIANYONG
CHEN CHUNGEN
ZHENG JIAN
YUAN CUI

Assignees

上海三思电子工程有限公司
上海三思科技发展有限公司
嘉善三思光电技术有限公司
浦江三思光电技术有限公司
浙江浦照光电技术有限公司

Dates

Publication Date: 20260512
Application Date: 20250928

Claims (10)

1. A brightness correction method of a pixel unit, wherein the pixel unit includes two or three primary color units, each primary color unit is driven at a preset gray scale ratio so that the pixel unit displays a mixed light of a specific color, the method comprising: Measuring the color coordinates of each primary color element respectively; measuring the color coordinates and the actual brightness of the pixel unit under each first gray level; according to the color coordinates of the primary color elements, the color coordinates of the pixel elements under the first gray scales and the actual brightness, respectively carrying out inversion calculation to obtain the actual brightness of the primary color elements under the first gray scales so as to form first sets; Taking the maximum actual brightness of each primary color element under the maximum first gray level as the maximum theoretical brightness of each primary color element under the maximum second gray level, obtaining the theoretical brightness of each primary color element under all other second gray levels through interpolation calculation based on an ideal linear relation, and forming each second set by the theoretical brightness of each primary color element under each second gray level; The method comprises the steps of respectively establishing a mapping relation between a second set and a first set of each primary color element, wherein the construction rule of the mapping relation comprises that for theoretical brightness Aip corresponding to each second gray level in the second set, the actual brightness YIj with the smallest difference value with the Aip is found in the corresponding first set, so that a first gray level corresponding to the actual brightness YIj is determined, and unidirectional mapping from the second gray level to the first gray level is established, wherein i is [1, n ], n is the number of primary color elements, aip is the theoretical brightness of the ith primary color element when the second gray level is p, YIj is the actual brightness of the ith primary color element when the first gray level is j; and receiving target gray scales of the primary color units, finding second gray scales corresponding to the target gray scales in the second set, finding first gray scales respectively forming a mapping relation with the second gray scales according to the mapping relation, and outputting the first gray scales to drive the primary color units to display.
2. The method for correcting brightness of pixel unit according to claim 1, wherein the inversion calculation method comprises substituting the color coordinates of each primary color element, the color coordinates of the pixel element at each first gray level and the actual brightness into the following equation set to calculate the actual brightness of each primary color element at each first gray level, Wherein Xm, ym and Zm are tristimulus values of the pixel unit, xi, yi and Zi are tristimulus values of the ith primary color unit, ym is the actual brightness of the pixel unit, yi is the actual brightness of the ith primary color unit, xi and Yi are color coordinates of the ith primary color unit, and Xm and Ym are color coordinates of the pixel unit.
3. The method according to claim 1, wherein the method for measuring the color coordinates of each primary color element comprises measuring the color coordinates of each primary color element at its corresponding maximum first gray level, measuring the color coordinates of each primary color element at any one of the first gray levels, or measuring the color coordinates of each primary color element at each first gray level.
4. The method of claim 1, wherein the number of the second gray levels of each primary color element is the same as the number of the first gray levels corresponding to the primary color element, and/or the number of the second gray levels between each primary color element is the same.
5. The method according to claim 1, wherein the step of inverting the actual brightness of each primary color element under each first gray level to form each first set includes expanding the number of the first gray levels according to a first preset value after inverting the actual brightness of each primary color element under each first gray level, and compensating the actual brightness of each primary color element under all expanded first gray levels by a difference value calculation based on an ideal linear relation, and forming the first set using the expanded actual brightness under each first gray level.
6. The method according to claim 1, wherein the pixel unit includes three primary color units, respectively a red color unit, a green color unit, and a blue color unit, and the mixed light of the specific color includes white light.
7. A brightness correction system for a pixel cell, comprising: The system comprises a measurement module, a pixel unit, a display module and a display module, wherein the measurement module is used for respectively measuring the color coordinates of each primary color unit, measuring the color coordinates and the actual brightness of the pixel unit under each first gray level, and the pixel unit comprises two or three primary color units, and each primary color unit is driven according to a preset gray level proportion so as to display mixed light with a specific color; The system comprises a set construction module, an interpolation calculation module, a first set forming module and a second set forming module, wherein the set construction module is used for respectively carrying out inversion calculation to obtain the actual brightness of each primary color unit under each first gray level according to the color coordinates of each primary color unit, the color coordinates of each pixel unit under each first gray level and the actual brightness of each primary color unit to form each first set; the mapping relation construction module is used for respectively establishing a mapping relation between a second set and a first set of each primary color unit, wherein the construction rule of the mapping relation comprises that for theoretical brightness Aip corresponding to each second gray level in the second set, the actual brightness YIj with the smallest difference value with the Aip is found in the corresponding first set, so that a first gray level corresponding to the actual brightness YIj is determined, and unidirectional mapping from the second gray level to the first gray level is established, wherein i is [1, n ], n is the number of primary color units, aip is the theoretical brightness of the ith primary color unit when the second gray level is p, YIj is the actual brightness of the ith primary color unit when the first gray level is j; The compensation execution module is used for receiving the target gray level of each primary color element, finding each second gray level corresponding to the target gray level in the second set, finding first gray levels respectively forming a mapping relation with each second gray level according to the mapping relation, and outputting each first gray level to drive each primary color element for display.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method of any of claims 1-6.
9. A computer program product comprising computer program code embodied therein, which when run on a computer causes the computer to carry out the method according to any of claims 1-6.
10. An electronic terminal comprising a memory, a processor and a computer program stored on the memory, characterized in that the processor executes the computer program to implement the method of any of claims 1-6.

Description

Pixel unit brightness correction method, system, medium, program and electronic terminal Technical Field The present application relates to the field of display technologies, and in particular, to a method, a system, a medium, a program, and an electronic terminal for correcting brightness of a pixel unit. Background With the rapid development of display technology, the market is increasingly pursuing high-resolution display devices. In order to realize clearer and finer image quality on the display panel with the same size, the number of integrated pixel units is dramatically increased. Currently, the mainstream driving scheme generally adopts a scanning mechanism of time-sharing multiplexing so as to save the cost of a driving chip. Under this mechanism, there is an upper limit to the number of pixel cells that can be lit up in a single scan. Therefore, when the total pixel units are increased, the whole screen is lighted, and the number of scans must be increased. However, due to the persistence effect of human eyes, the total time of a complete scan of a whole frame of the image cannot be extended without limitation as the number of pixels increases. Therefore, as the number of scans increases, the time window allocated for a single scan is greatly compressed. The effect of signal delay caused by parasitic capacitance effects in the circuit is increasingly pronounced when the single scan time is reduced to the microsecond or even nanosecond level. The delay can cause distortion of PWM waveform output by the driving chip, and the actual lighting time of the pixel unit can not be accurately controlled, so that the problems of gray level misalignment, color deviation and other display quality are caused. In addition, the algorithm compensation function built in the driving chip causes obvious gray jump phenomenon, namely discontinuous gray change, in a low gray level area due to errors of the algorithm compensation function, and further damages the uniformity and color reproducibility of the picture. Therefore, in order to solve the problem of the decrease in brightness control accuracy caused by high resolution and high frequency scanning, performing high-accuracy brightness correction on each pixel unit on the display device has become a key and necessary technical link for improving the final imaging quality. However, the existing pixel unit brightness correction method is to independently correct each primary color unit by separately measuring the brightness of each primary color unit. When the single primary color units are corrected, the adjacent modules are in a non-energized dormant state, the capacitive loads of the adjacent modules do not affect each other, but when the mixed color is actually displayed, the multiple primary color units are driven simultaneously, the dynamic capacitive effects of the multiple primary color units can cross each other, and the actual luminous effect of each primary color unit deviates from the state when the primary color units are independently corrected. The difference between the correction state and the actual working state results in a small brightness residual error after correction of a single primary color element, and the small brightness residual error is obviously amplified when mixed colors are formed, so that chromaticity deviation which can be easily perceived by human eyes is caused. Therefore, in order to correct the mixed chromatic aberration, the conventional method has to introduce additional iterative measurement and compensation links, thus greatly reducing the correction efficiency. Disclosure of Invention In view of the above-described drawbacks of the related art, an object of the present application is to provide a method, a system, a medium, a program, and an electronic terminal for correcting luminance of a pixel unit, for solving the foregoing problems. To achieve the above and other related objects, a first aspect of the present application provides a brightness correction method of a pixel unit including two or three primary color units, each primary color unit being driven at a preset gray scale ratio so that the pixel unit displays a mixed light of a specific color, the method comprising measuring color coordinates of each primary color unit, respectively; measuring the color coordinates and the actual brightness of the pixel units under each first gray level, respectively carrying out inversion calculation according to the color coordinates of the primary color units, the color coordinates of the pixel units under each first gray level and the actual brightness to obtain the actual brightness of the primary color units under each first gray level so as to form each first set, taking the maximum actual brightness of the primary color units under the maximum first gray level as the maximum theoretical brightness of the primary color units under the maximum second gray level, obtaining the theoretical brightness of the primary color un