Method and system for calculating adaptive panel color parameters

Patent metadata

Field	Value
Publication number	US-12482437-B2
Application number	US-202418659084-A
Country	US
Kind code	B2
Filing date	May 9, 2024
Priority date	May 17, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A method for calculating adaptive panel color parameters and an adaptive panel-color-parameter calculation system are provided. The adaptive panel-color-parameter calculation system embodies an arithmetic circuit that is implemented by a circuitry or a firmware, and can be operated in a control circuit that controls an on-screen menu and display parameters of a display panel. In the method, current environmental parameters of the display panel, such as an electric current and a temperature, are acquired, and color characteristic parameters can be obtained by querying a panel-characteristic lookup table. Afterwards, a color transfer matrix is updated according to the obtained color characteristic parameters as compared to a target value. The color transfer matrix is used to derive a new set of panel color parameters that are provided to a driver circuit of the display panel. The display panel then displays a picture with the new set of panel color parameters.

First claim

What is claimed is:

1 . A method for calculating adaptive panel color parameters, comprising:
obtaining current environmental parameters of a display panel; obtaining color characteristic parameters of the display panel according to the current environmental parameters; updating a color transfer matrix according to target values and the color characteristic parameters of the display panel, and generating panel color parameters with the updated color transfer matrix; and providing the panel color parameters to a driver circuit of the display panel, so as to apply to the display panel with the panel color parameters generated with the color transfer matrix; wherein the driver circuit drives the display panel to display a video frame-by-frame; wherein, when the updated color transfer matrix is obtained, an original color transfer matrix of the video is updated by the color transfer matrix within a blanking period between two frames based on a video timing, and a timing for updating color parameters of the display panel through application of the panel color parameters generated by the color transfer matrix is determined based on the video timing, afterwards, the updated panel color parameters take effect on a next frame.

2 . The method according to claim 1 , wherein the target values are predetermined target color values with red, green, and blue values for the display panel, and the updated color transfer matrix is used to compensate differences between colors displayed by the display panel under the current environmental parameters and the target color values.

3 . The method according to claim 1 , wherein, when the panel color parameters are provided to the driver circuit, the driver circuit controls a current applied to the display panel for changing brightness of a backlight, so as to compensate the color parameters of the display panel.

4 . The method according to claim 1 , wherein, after a panel-characteristic lookup table is queried or referred to, an interpolation method is applied for obtaining the color characteristic parameters corresponding to the current environmental parameters of the display panel.

5 . The method according to claim 4 , wherein the current environmental parameters of the display panel include at least one of a current, a voltage, or a current temperature that are measured by a sensor, and the display panel is driven by the current, the voltage, and/or the current temperature.

6 . The method according to claim 4 , wherein, through measuring changes of a color gamut and chromaticity of reference white of the display panel at different currents and temperatures, the color characteristic parameters of the display panel are formed for establishing the panel-characteristic lookup table.

7 . The method according to claim 4 , wherein, through querying the panel-characteristic lookup table, the recorded color characteristic parameters of the display panel that correspond to a maximum current and a maximum temperature are obtained and used to calibrate post-gamma parameters of the driver circuit.

8 . The method according to claim 7 , wherein, through querying the panel-characteristic lookup table, a color gamut and chromaticity of reference white of the display panel are obtained for calculation of a transfer matrix that is used to convert three primary color values to tristimulus values; wherein the transfer matrix and a target transfer matrix that is used to convert predetermined tristimulus values of a target color gamut of the display panel to the three primary color values are used to calculate the color transfer matrix.

9 . An adaptive panel-color-parameter calculation system, which is an arithmetic circuit implemented by a circuitry or a firmware, performing a method for calculating adaptive panel color parameters, wherein the method comprises:
obtaining current environmental parameters of a display panel; obtaining color characteristic parameters of the display panel according to the current environmental parameters; updating a color transfer matrix according to target values and the color characteristic parameters of the display panel, and generating panel color parameters with the updated color transfer matrix; and providing the panel color parameters to a driver circuit of the display panel, so as to apply the panel color parameters obtained by the color transfer matrix to the display panel; wherein the driver circuit drives the display panel to display a video frame-by-frame; wherein, when the updated color transfer matrix is obtained, an original color transfer matrix of the video is updated by the color transfer matrix within a blanking period between two frames based on a video timing, and a timing for updating color parameters of the display panel through application of the panel color parameters generated by the color transfer matrix is determined based on the video timing, afterwards, the updated panel color parameters take effect on a next frame.

10 . The adaptive panel-color-parameter calculation system according to claim 9 , wherein the adaptive panel-color-parameter calculation system is operated as the firmware in a control circuit that is used to control an on-screen menu displayed on the display panel and to control display parameters.

11 . The adaptive panel-color-parameter calculation system according to claim 9 , wherein the target values are predetermined target color values with red, green and blue values for the display panel, and the updated color transfer matrix is used to compensate differences between colors displayed by the display panel under the current environmental parameters and the target color values.

12 . The adaptive panel-color-parameter calculation system according to claim 9 , wherein a memory is used to store a panel-characteristic lookup table; wherein, after the panel-characteristic lookup table is queried or referred to, an interpolation method is applied for obtaining the color characteristic parameters corresponding to the current environmental parameters of the display panel.

13 . The adaptive panel-color-parameter calculation system according to claim 12 , wherein the current environmental parameters of the display panel include at least one of a current, a voltage or a current temperature that are measured by a sensor, and the display panel is driven by the current and the voltage.

14 . The adaptive panel-color-parameter calculation system according to claim 13 , wherein the current temperature of the display panel is sensed by a temperature sensor that is built in the display panel or externally mounted on the display panel.

15 . The adaptive panel-color-parameter calculation system according to claim 12 , wherein, when changes of color gamut and chromaticity of reference white of the display panel at different currents and temperatures are measured, the color characteristic parameters of the display panel are formed for establishing the panel-characteristic lookup table.

16 . The adaptive panel-color-parameter calculation system according to claim 15 , wherein, through querying the panel-characteristic lookup table, the color gamut and the chromaticity of the reference white of the display panel are obtained for calculation of a transfer matrix that is used to convert three primary color values to tristimulus values; wherein the transfer matrix and a target transfer matrix that is used to convert predetermined tristimulus values of a target color gamut of the display panel to the three primary color values are used to calculate the color transfer matrix.

Assignees

• Realtek Semiconductor Corp

Inventors

• Chen Li-Ming

Classifications

• G09G2320/041

  Temperature compensation · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G5/006

  Details of the interface to the display terminal (specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04) · CPC title

• G09G5/06 Primary

  using colour palettes, e.g. look-up tables · CPC title