Display color temperature adjusting method and system

Abstract

The invention discloses a display color temperature adjusting method and system. The method comprises the steps that a test pattern picture is generated in a Scaler module of display equipment to replace a traditional signal generator; reading XYZ tristimulus values of the picture through a color analyzer; calculating a color temperature adjustment value based on a mathematical matrix algorithm; and adjusting RGB parameters of the tested display device according to the color temperature adjustment value, so that the color temperature accords with a preset specification. According to the invention, the adjustment efficiency is greatly improved, the cost is reduced, risks caused by poor signal generators are eliminated, and the consistency and reliability of products are improved.

Description

Technical Field

[0001] This invention relates to the field of display device technology, and in particular to a method and system for adjusting display color temperature. Background Technology

[0002] In existing technologies, color temperature adjustment for displays typically involves inputting a signal to the display device via a signal generator, then adjusting the display device's factory RGB values ​​through I2C communication. This process is repeated until the color temperature is within the customer's specifications. This technology is time-consuming and costly. The repetitive adjustment process is cumbersome and inefficient; it also requires a signal generator to output a signal image. When the signal generator outputs a poor-quality signal image, it can easily result in substandard adjustments entering the market. Summary of the Invention

[0003] The purpose of this invention is to provide a method and system for adjusting display color temperature. This invention utilizes the image processing capabilities of a Scaler to achieve a built-in pattern output screen, replacing the traditional signal generator output screen and saving on the signal generator. This invention solves the problem of slow speed and low efficiency in repeatedly adjusting RGB. This invention prevents inaccurate color temperature adjustment caused by a faulty signal generator.

[0004] The technical solution adopted in this invention is:

[0005] A method for adjusting display color temperature includes the following steps:

[0006] The built-in test pattern is generated by the scaler chip of the display device to replace the external signal generator;

[0007] The colorimetric data of the built-in test pattern screen output by the display device is read by a color analyzer (spectrometer). The colorimetric data includes the XYZ tristimulus values ​​of the four screens: red, green, blue, and white.

[0008] Based on the XYZ tristimulus values, the color temperature adjustment value of the display device is calculated through a mathematical matrix algorithm, wherein the mathematical matrix algorithm includes using a transpose matrix to convert the XYZ values ​​into target RGB values;

[0009] Adjust the RGB parameters of the display device according to the color temperature adjustment value to make the color temperature conform to the preset specifications.

[0010] Furthermore, the generation of the built-in test pattern screen includes: using the image processing function of the Scaler chip to output static or dynamic patterns, including solid color screens or grayscale gradient screens.

[0011] Furthermore, the matrices used in the mathematical matrix algorithm include a transformation matrix M and its inverse matrix M⁻¹, which are used to map XYZ tristimulus values ​​to RGB values, wherein the matrices are constructed based on the CIE standard colorimetric system.

[0012] Furthermore, the coefficients of the transformation matrix M and its inverse matrix M⁻¹ are defined by the following relation:

[0013] ;

[0014] ;

[0015] ;

[0016] Where X, Y, and Z are the tristimulus values ​​in the XYZ coordinate system, and R, G, and B are the values ​​in the RGB coordinate system. , , , , , , , , These are the preset conversion coefficients.

[0017] Furthermore, a verification step is included before adjusting the RGB parameters of the display device:

[0018] By comparing the adjusted color temperature value with the target specification value, it is determined whether there is a difference. If the difference does not reach the preset threshold, the color temperature adjustment value is recalculated until the difference meets the threshold requirement.

[0019] A display color temperature adjustment system, comprising:

[0020] The display device under test is used to generate a built-in test pattern using its own Scaler chip.

[0021] A color analyzer is used to read the chromaticity data displayed on the built-in test pattern screen of the display device under test;

[0022] The test PC is used to calculate the color temperature adjustment value based on the chromaticity data using a mathematical matrix algorithm.

[0023] The DDC test board connects to the test PC and the display device under test to form a communication link, so that the test PC can adjust the RGB parameters of the display device according to the color temperature adjustment value.

[0024] Furthermore, the test PC also includes a verification module for comparing color temperature values ​​before and after adjustment to prevent defective products from flowing into the next process.

[0025] This invention employs the above technical solution, utilizing the image processing function of a Scaler to achieve a built-in pattern output screen; it uses the display device's own output screen and a color analyzer (spectrometer) to read the XYZ values ​​of the four screens (RED GREEN BLUE WHITE) to calculate the xyLv and (uvLv) of all color temperatures to meet customer specifications; simultaneously, it uses a mathematical matrix to calculate color temperature, which is efficient and accurate. This invention can prevent adjustment defects caused by a faulty signal generator. Furthermore, the system constructed by this invention can be expanded to accommodate more functions. Attached Figure Description

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments;

[0027] Figure 1 This is a flowchart illustrating a method for adjusting display color temperature according to the present invention.

[0028] Figure 2 This is a schematic diagram of the principle architecture of a display color temperature adjustment system according to the present invention. Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0030] like Figure 1 As shown in Figure 2, this invention discloses a method for adjusting display color temperature, which includes the following steps:

[0031] The built-in test pattern is generated by the scaler chip of the display device to replace the external signal generator;

[0032] The colorimetric data of the built-in test pattern screen output by the display device is read by a color analyzer (spectrometer). The colorimetric data includes the XYZ tristimulus values ​​of the four screens: red, green, blue, and white.

[0033] Based on the XYZ tristimulus values, the color temperature adjustment value of the display device is calculated through a mathematical matrix algorithm, wherein the mathematical matrix algorithm includes using a transpose matrix to convert the XYZ values ​​into target RGB values;

[0034] Adjust the RGB parameters of the display device under test according to the color temperature adjustment value to make the color temperature conform to the preset specifications.

[0035] Furthermore, the generation of the built-in test pattern screen includes: using the image processing function of the Scaler chip to output static or dynamic patterns, including solid color screens or grayscale gradient screens.

[0036] Furthermore, the matrices used in the mathematical matrix algorithm include a transformation matrix M and its inverse matrix M⁻¹, which are used to map XYZ tristimulus values ​​to RGB values, wherein the matrices are constructed based on the CIE standard colorimetric system.

[0037] Furthermore, the coefficients of the transformation matrix M and its inverse matrix M⁻¹ are defined by the following relation:

[0038] ;

[0039] ;

[0040] ;

[0041] Where X, Y, and Z are the tristimulus values ​​in the XYZ coordinate system, and R, G, and B are the values ​​in the RGB coordinate system. , , , , , , , , The preset conversion coefficient can be obtained through a limited number of experiments or pre-set by relevant professionals using their expertise.

[0042] Furthermore, a verification step is included before adjusting the RGB parameters of the display device:

[0043] By comparing the adjusted color temperature value with the target specification value, it is determined whether there is a difference. If the difference does not reach the preset threshold, the color temperature adjustment value is recalculated until the difference meets the threshold requirement.

[0044] A display color temperature adjustment system, comprising:

[0045] The display device under test is used to generate a built-in test pattern using its own Scaler chip.

[0046] A color analyzer is used to read the chromaticity data displayed on the built-in test pattern screen of the display device under test;

[0047] The test PC is used to calculate the color temperature adjustment value based on the chromaticity data using a mathematical matrix algorithm.

[0048] The DDC test board connects to the test PC and the display device under test to form a communication link, so that the test PC can adjust the RGB parameters of the display device according to the color temperature adjustment value.

[0049] Furthermore, the test PC also includes a verification module for comparing color temperature values ​​before and after adjustment to prevent defective products from flowing into the next process.

[0050] This invention employs the above technical solution, utilizing the image processing function of a Scaler to achieve a built-in pattern output screen; it uses the display device's own output screen and a color analyzer (spectrometer) to read the XYZ values ​​of the four screens (RED GREEN BLUE WHITE) to calculate the xyLv and (uvLv) of all color temperatures to meet customer specifications; simultaneously, it uses a mathematical matrix to calculate color temperature, which is efficient and accurate. This invention can prevent adjustment defects caused by a faulty signal generator. Furthermore, the system constructed by this invention can be expanded to accommodate more functions.

[0051] Obviously, the described embodiments are only a portion, not all, of the embodiments of this application. Without conflict, the embodiments and features described and illustrated herein can be combined with each other. The components of the embodiments of this application generally described and illustrated in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A display color temperature adjustment method, characterized by: It comprises the following steps: Generate a built-in test pattern picture through the Scaler chip of the display device to replace the external signal generator; Read the chrominance data of the built-in test pattern picture output by the display device through the color analyzer, and the chrominance data includes XYZ three stimulus values of red, green, blue and white four pictures; Based on the XYZ three stimulus values, calculate the color temperature adjustment value of the display device through a mathematical matrix algorithm, wherein the mathematical matrix algorithm includes converting the XYZ values to target RGB values using a transpose matrix; Adjust the RGB parameters of the display device according to the color temperature adjustment value to make the color temperature meet the preset specification.

2. The display color temperature adjustment method of claim 1, wherein: The generation of the built-in test pattern picture includes: outputting a static or dynamic pattern using the image processing function of the Scaler chip, and the pattern includes a solid color picture or a gray scale gradient picture.

3. The method of claim 1, wherein: The matrix used in the mathematical matrix algorithm includes a conversion matrix M and its inverse matrix M⁻¹, which are used to map the XYZ three stimulus values to the RGB values, wherein the matrix is constructed based on the CIE standard chrominance system.

4. The display color temperature adjustment method of claim 3, wherein: The coefficients of the conversion matrix M and its inverse matrix M⁻¹ are defined by the following relationship: ; ; ; Wherein, X, Y, Z are three stimulus values in XYZ coordinate system, R, G, B are values in RGB coordinate system, , , , , , , , , are preset conversion coefficients.

5. The method of claim 1, wherein: Before adjusting the RGB parameters of the display device, it also includes a verification step: By comparing the adjusted color temperature value with the target specification value, it is judged whether there is a difference, if the difference does not reach the preset threshold, the color temperature adjustment value is recalculated until the difference meets the threshold requirement.

6. A display color temperature adjustment system, according to any one of the display color temperature adjustment methods of claims 1 to 5, characterized in that: The system comprises: The display device under test is used to generate a built-in test pattern picture using its own Scaler chip; The color analyzer is used to read the chrominance data of the built-in test pattern picture displayed on the display device under test; The test PC is used to calculate the color temperature adjustment value by executing a mathematical matrix algorithm according to the chrominance data; The DDC test board is connected to the test PC and the display device under test to form a communication link, so that the test PC adjusts the RGB parameters of the display device according to the color temperature adjustment value.

7. The display color temperature adjustment system of claim 6, wherein The test PC also includes a verification module for comparing the color temperature values before and after adjustment to prevent defective products from flowing into the next process.

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