Method and system for automatically adjusting white balance of gray scale of liquid crystal display dark field

Abstract

The invention relates a method and a system for automatically adjusting white balance of gray scale of a liquid crystal display dark field. The method comprises the following steps that: a gray scale signal generator provides black and white window video signals, in which gray scale levels are changed according to a time sequence, for a liquid crystal display; a gray scale color analyzer detects brightness and colorimetric values of alternating gray scales of the liquid crystal display and transmits the measuring result to a microcomputer system; the microcomputer system runs automatic adjusting software of the white balance of the gray scale of the dark field, and the software processes data, analyzes the color changing conditions of different gray scales of the dark field, optimizes white balance adjusting data values of the liquid crystal display according to standard dark field color coordinates to make error of each gray scale relative to standard white field color coordinate minimum and transmits the optimized white balance adjusting data values red, green and blue CUTOFF to the liquid crystal display; and the liquid crystal display changes the color of the dark field in real time according to the received white balance adjusting data values. Through the method and the system, an absolute error value of the color of each gray scale of the dark field relative to the standard color is minimum and the color cast problem of the dark field is improved.

Description

technical field [0001] The invention relates to a method and a system for automatically adjusting the gray scale white balance of a liquid crystal display. Background technique [0002] Liquid crystal displays generally require white balance adjustment during the production process, and the essence of white balance adjustment is to adjust the color temperature. The general adjustment method is manual visual white balance adjustment or automatic adjustment using a white balance meter. When adjusting the white balance, the video signal source provides at least two levels of gray signals, bright and dark, to the liquid crystal display. Modify the contents of the red, green and blue gain (GAIN) and cutoff (CUTOFF) data registers inside the LCD to change the colors of bright and dark gray scales. The GAIN data register is mainly used to change the color of the bright field gray scale, and the CUTOFF data register is mainly used to change the color of the dark field gray scale. ...

AI Technical Summary

Problems solved by technology

Manually adjusting the white balance can judge more gray scales. The color adjustment effect of the liquid crystal display is better than that of the white balance instrument, but the judgment of the human eye on the color is related to experience, and the consistency of adjustment by different personnel is very poor.

These bring great difficulties and uncertainties to the adjustment of dark field grayscale white balance

These current adjustment methods cannot well solve the problem of adjusting the white balance of the dark field of the liquid crystal display

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