WO-2026092675-A1 - COLOR CALIBRATION METHOD AND APPARATUS, DISPLAY DEVICE, STORAGE MEDIUM, AND PROGRAM PRODUCT

WO2026092675A1WO 2026092675 A1WO2026092675 A1WO 2026092675A1WO-2026092675-A1

Abstract

The present application relates to the technical field of color calibration, and discloses a color calibration method, a color calibration apparatus, a display device, a storage medium, and a computer program product. In the present application, firstly, an accurate color forward model is constructed by sampling some panel color sample points, and chromaticity coordinates of any RGB grayscale data of a display panel to be calibrated in a CIE-XYZ color space can be quickly and accurately computed on the basis of the color forward model; then, a color inverse model is constructed on the basis of the color forward model, wherein the color inverse model can output RGB grayscale data of said display panel corresponding to any chromaticity coordinates of said display panel in the CIE-XYZ color space, so as to ensure the accuracy of color calibration; finally, on the basis of the color inverse model, an original color gamut of said display panel is calibrated to a target color gamut, so as to complete high-precision color calibration.

Inventors

ZHOU, Kailong
ZHOU, WENJUN
YU, Wenhui
TANG, Yingying
LIU, YAOCHENG

Assignees

青岛歌尔视显科技有限公司

Dates

Publication Date: 20260507
Application Date: 20251031
Priority Date: 20241104

Claims (10)

A color calibration method, characterized in that it includes: The display panel to be calibrated is sampled to obtain multiple RGB grayscale data and the color coordinates of the CIE-XYZ color space corresponding to each RGB grayscale data. A color forward model of the display panel to be calibrated is established based on the RGB grayscale data and the corresponding CIE-XYZ color coordinates of the multiple display panels to be calibrated, wherein the color forward model is used to generate the color coordinates of any RGB grayscale data in the display panel to be calibrated in the CIE-XYZ color space. A color inverse model of the display panel to be calibrated is established based on the color forward model, wherein the color inverse model is used to obtain the RGB grayscale data of the display panel to be calibrated corresponding to any color coordinate of the display panel to be calibrated in the CIE-XYZ color space. Based on the color inversion model, the original color gamut of the display panel to be calibrated is calibrated to the target color gamut.
The color calibration method as described in claim 1, characterized in that the step of establishing a color forward model of the display panel to be calibrated includes: Based on the sampled RGB grayscale data and the corresponding color coordinates in the CIE-XYZ color space, the independent response coefficients and crosstalk response coefficients of each RGB channel in the display panel to be calibrated are obtained to the color coordinates. Based on the independent response coefficient and the crosstalk response coefficient, the first XYZ response corresponding to the independent RGB three channels and the second XYZ response corresponding to the crosstalk between the RGB three channels are obtained respectively. A color forward model of the display panel to be calibrated is established based on the first XYZ response and the second XYZ response.
The color calibration method as described in claim 1, characterized in that, after the step of establishing the color forward model of the display panel to be calibrated, the method includes: The original color gamut of the display panel to be calibrated is calculated using the color positive model. If the target color gamut of the display panel to be calibrated is larger than the original color gamut, then color gamut compression is performed with reference to the target color gamut and the original color gamut.
The color calibration method as described in claim 1 is characterized in that, in the color inversion model, the initial RGB grayscale data is obtained based on the color coordinates of the display panel to be calibrated in the CIE-XYZ color space and the preset transformation matrix; Using the color forward model, the color coordinates of each RGB grayscale data in the RGB space centered on the initial RGB grayscale data are obtained in the CIE-XYZ color space, and the RGB grayscale data with the smallest color difference in the RGB space is determined.
The color calibration method as described in claim 1, characterized in that the step of calibrating the original color gamut of the display panel to be calibrated to the target color gamut according to the color inversion model includes: A three-dimensional lookup table for the display panel to be calibrated is generated, wherein the index value of the three-dimensional lookup table is the RGB sample value of the target color gamut of the display panel to be calibrated, the RGB sample value is converted into color coordinates of the CIE-XYZ color space through the color gamut conversion standard of the target color gamut, and the lookup value of the three-dimensional lookup table corresponding to the index value is obtained by the converted color coordinates of the CIE-XYZ color space and the color inverse model; The original color gamut of the display panel is calibrated to the target color gamut using the three-dimensional lookup table.
The color calibration method as described in claim 5 is characterized in that the index value of the three-dimensional lookup table is obtained through non-uniform sampling.
A color calibration device, characterized in that the color calibration device comprises: The sampling module is used to sample the display panel to be calibrated to obtain multiple RGB grayscale data and the color coordinates of the CIE-XYZ color space corresponding to each RGB grayscale data. The first establishment module is used to establish a color forward model of the display panel to be calibrated based on the RGB grayscale data and the corresponding CIE-XYZ color coordinates of the multiple display panels to be calibrated, wherein the color forward model is used to generate the color coordinates of any RGB grayscale data in the display panel to be calibrated in the CIE-XYZ color space. The second establishment module is used to establish a color inverse model of the display panel to be calibrated based on the color forward model, wherein the color inverse model is used to obtain the RGB grayscale data of the display panel to be calibrated corresponding to any color coordinate of the display panel to be calibrated in the CIE-XYZ color space. The calibration module is used to calibrate the original color gamut of the display panel to be calibrated to the target color gamut according to the color inversion model.
A display device, characterized in that the device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the color calibration method as described in any one of claims 1 to 6.
A storage medium, characterized in that the storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium, wherein when the computer program is executed by a processor, it implements the steps of the color calibration method as described in any one of claims 1 to 6.
A computer program product, characterized in that the computer program product includes a computer program, which, when executed by a processor, implements the steps of the color calibration method as described in any one of claims 1 to 6.

Description

Color calibration methods, apparatus, display devices, storage media and program products This application claims priority to Chinese Patent Application No. 202411562708.6, filed on November 4, 2024, entitled "Color calibration method, apparatus, display device, storage medium and program product", the entire contents of which are incorporated herein by reference. Technical Field This application relates to the technical field of color calibration, and more particularly to color calibration methods, color calibration devices, display devices, storage media, and computer program products. Background Technology In recent years, micro-OLED (micro-organic light-emitting diode) display technology has developed rapidly, featuring high brightness, wide color gamut, and high pixel density, providing better display effects for virtual reality and mixed reality devices. However, due to manufacturing limitations, the original color accuracy of micro-OLED panels generally cannot meet commonly used color standards, such as the widely used sRGB color standard, the Display P3 color standard, and the more advanced BT.2020 color standard. Therefore, color calibration of the panel is necessary to achieve a certain level of color accuracy. However, existing methods require collecting a large number of sample points for calibration when calibrating the color of micro-OLED panels, which makes it difficult to guarantee calibration accuracy and consumes a lot of calibration time. The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention The main objective of this application is to provide a color calibration method, a color calibration device, a display device, a storage medium, and a computer program product, aiming to solve the technical problem of low color calibration efficiency in micro-oled panels. To achieve the above objectives, this application proposes a color calibration method, which includes: The display panel to be calibrated is sampled to obtain multiple RGB grayscale data and the color coordinates of the CIE-XYZ color space corresponding to each RGB grayscale data. A color forward model of the display panel to be calibrated is established based on the RGB grayscale data and corresponding CIE-XYZ color coordinates of multiple display panels to be calibrated. The color forward model is used to generate the color coordinates of any RGB grayscale data in the display panel to be calibrated in the CIE-XYZ color space. A color inverse model is established based on the color forward model. The color inverse model is used to obtain the RGB grayscale data of the display panel to be calibrated, which corresponds to any color coordinate of the display panel in the CIE-XYZ color space. Based on the color inversion model, the original color gamut of the display panel to be calibrated is calibrated to the target color gamut. In one embodiment, the step of establishing a color forward model of the display panel to be calibrated includes: Based on the sampled RGB grayscale data and their corresponding CIE-XYZ color coordinates, the independent response coefficients and crosstalk response coefficients of each RGB channel in the display panel to be calibrated are obtained. Based on the independent response coefficient and the crosstalk response coefficient, the first XYZ response corresponding to the independent RGB three channels and the second XYZ response corresponding to the crosstalk between the RGB three channels are obtained respectively. A color forward model of the display panel to be calibrated is established based on the first XYZ response and the second XYZ response. In one embodiment, the step of establishing a color positive model of the display panel to be calibrated includes: The original color gamut of the display panel to be calibrated is calculated using a positive color model. If the target color gamut of the display panel to be calibrated is larger than the original color gamut, then color gamut compression is performed with reference to the target color gamut and the original color gamut. In one embodiment, in the color inversion model, initial RGB grayscale data is obtained based on the color coordinates of the display panel to be calibrated in the CIE-XYZ color space and a preset transformation matrix; By using a color forward model, the color coordinates of each RGB grayscale data in the RGB space centered on the initial RGB grayscale data are obtained in the CIE-XYZ color space, and the RGB grayscale data with the smallest color difference in the RGB space are determined. In one embodiment, the step of calibrating the original color gamut of the display panel to be calibrated to the target color gamut according to the color inversion model includes: A three-dimensional lookup table is generated for the display panel to be calibrated. The index value of the three-dimensional lo