Control device and control method of direct beck light source

Abstract

A control device and a control method for a direct-type backlight source. The control device for a direct-type backlight source comprises: sensors (20) connected successively, a backlight control circuit (30), and a direct-type backlight source driving circuit (40). The sensors (20) are located between four light emitting units (101, 102) of the direct-type backlight source (10), and are connected with the backlight control circuit (30). The direct-type backlight source driving circuit (40) is connected with the light emitting units (101, 102) of the direct-type backlight source (10). Intensity of red light, green light, and blue light is detected and stored at a preset interval, and is compared with previously stored intensity of the red light, green light, and blue light to obtain an adjustment amplitude of a corresponding driving current. Then, a corresponding working current of the direct-type backlight source (10) is adjusted according to the adjustment amplitude of the corresponding driving current, and chroma of the direct-type backlight source (10) is adjusted. The control device and control method provided by the present invention can reduce the chroma excursion of display images, thereby maintaining qualitative shift of the display images.

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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