Control device and control method of direct beck light source

Abstract

The invention provides a control device and a control method of a direct beck light source. The control device of the direct beck light source comprises a sensor, a backlight control circuit and a direct beck light source driving circuit which are connected in sequence, the sensor is located among four light-emitting units of the direct beck light source and connected with the backlight control circuit, and the direct beck light source driving circuit is connected with the light-emitting units of the direct beck light source. By means of the control device and the control method, light intensity of red light, green light and blue light are detected and stored at interval preset time, the light intensity is compared with light intensity of red light, green light and blue light at the last time to obtain amplitude of corresponding driving current required to be adjusted, and corresponding working current of the direct beck light source is adjusted according to the amplitude of the corresponding driving current required to be adjusted. Without influence of backlight dynamic adjustment, the control device and the control method of the direct beck light source achieve chrominance adjustment of the direct beck light source, reduce chrominance drift of displayed pictures, and maintain stability of the displayed pictures.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a direct-lit backlight source control device and a control method. Background technique [0002] Liquid Crystal Display (LCD for short) is a kind of display that uses the principle of liquid crystal torsion to realize image display. Since the liquid crystal molecules themselves do not emit light, it is usually necessary to set up a backlight. According to the relative position of the light source and the light guide plate It is divided into side-type backlight and direct-type backlight. [0003] For the direct type backlight with red, green, blue (Red Green Blue, RGB for short) tricolor light-emitting diode (Light Emitting Diode, LED for short) as the light source, the red, green and blue light can be uniformly mixed to form a certain chromaticity white light and provide backlight for LCD. [0004] The direct-type backlight can be divided into multiple areas, tha...

AI Technical Summary

Problems solved by technology

[0006] The dynamic adjustment of each area of ​​the direct-type backlight and the adjustment of the chromaticity of the direct-type backlight cannot be carried out at the same time. The brightness and color of each area of ​​the source are adjusted, and the adjustment of the chromaticity of the direct-lit backlight requires a sensor to detect the light mixed by the red, green, and blue LEDs when the driving current is driven.

For the direct-type backlight with dynamic adjustment, it is impossible to judge whether the information detected by the sensor is the dynamic adjustment of the direct-type backlight or the LED itself is attenuated.

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