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LED display screen white balance correction technology

A display and white balance technology, applied in static indicators, instruments, etc., can solve the problems of unable to reproduce image color, LED display color cast, etc., to achieve consistent brightness and solve the effect of color cast

Inactive Publication Date: 2013-10-23
LIGHTHOUSE TECH (HUIZHOU) LTD
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Problems solved by technology

[0004] The chromaticity space displayed by the LED display is determined by the three primary colors of the LED lamp beads, and the produced LED lamp beads deviate from the standard SRGB color space, and the LED display screen will appear color cast, which cannot reproduce the true color of the image

Method used

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Embodiment Construction

[0011] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0012] This specific embodiment adopts the following technical solution: by controlling the different brightness ratios of the red, green and blue LED lamp beads on the LED display screen, thousands of changing colors can be obtained. In the application of LED display, according to the principle of color mixing, the brightness (LvW) of the white light obtained by mixing red, green and blue colors is the sum of the brightness of red, green and blue colors (LvR, LvG, LvB), and the CIE1931 of white light The color coordinates are determined by the tristimulus values ​​(X, Y, Z) of red, green, and blue, and the relationship is as follows:

[0013] …………(1)

[0014] The relationship between color coordinates and tristimulus values ​​is as follows: ...

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Abstract

The invention discloses an LED display screen white balance correction technology and relates to the technical field of LEDs. The LED display screen white balance correction technology is realized in the correction steps that (1) the target red, green, blue and white luminance and the target red, green, blue and white chrominance of a display screen are set; (2) a pixel positioning technology is applied, each LED lamp bead is positioned, the luminance, the chrominance (without chrominance compensation) and other data of each LED lamp bead are collected, the corresponding data are obtained, and nine correction systems of the red, the green and the blue (with compensation) are calculated and obtained; (3) after correction coefficients of all pixels are generated, the correction coefficients are written in a system board of the display screen. The display screen drives an IC in a PWM mode, the nine coefficients are duty ratios, and when the red, the green and the blue of the whole display screen reach the target luminance and the target chrominance, the white formed by the red, the green and the blue in a mixed mode reaches the target luminance and the target chrominance naturally. The LED display screen white balance correction technology enables the luminance of all positions of the LED display screen to be consistent and meanwhile eliminates the color cast phenomenon of the display screen.

Description

technical field [0001] The invention relates to the technical field of LEDs, in particular to an LED display screen white balance correction technology. Background technique [0002] At present, the LED displays on the market all use PWM to drive the LED lamp beads. When the LED display screen is completely white, the driving current of the LED lamp beads on the entire screen is consistent. In the production process of LED lamp beads, because it is difficult to produce according to the set light intensity, dominant wavelength and other parameters in the process, the LED lamp beads that are graded and screened according to a certain light intensity ratio and dominant wavelength range after packaging are used in LED display. If the consistency of the light intensity of the applied LED lamp beads is poor, mottled spots will appear on the LED display screen. piebald. In order to obtain a display screen with better mottled effect, it is necessary to further narrow the range ...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 谢定华王映峰谢永标齐国森
Owner LIGHTHOUSE TECH (HUIZHOU) LTD
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