Dynamic backlight brightness control method

Abstract

The invention relates to a light-emitting control method for adopting and controlling liquid crystals to emit light from independent light sources for displaying characters, in particular to a dynamic backlight brightness control method for an LED display panel. The control method comprises the following steps: (1) detecting the brightness of pixel points of the full screen in a liquid crystal display at fixed threshold value intervals, and weighing and computing the average brightness value of the full screen according to the detecting result; (2) recording the average brightness value computed in the step (1), accumulating a fixed quantity of samples with the average brightness value, and then, computing the average sample value of each group of samples; and (3) comparing the previouslycomputed average sample value with the subsequently computed average sample value to acquire a difference value, and controlling the brightness of the full screen to be changed proportionally with the change of the difference value. By detecting the backlight brightness of the full screen, the change of the backlight brightness of the full screen is controlled to achieve the purposes of improvingthe brightness of images and avoiding the defect of light leakage, and simultaneously, the control of the brightness also improves the integral subjective effect and the dynamic contrast.

Description

technical field [0001] The invention relates to a lighting control method using liquid crystal and controlling the lighting from an independent light source for displaying characters, in particular to a dynamic backlight brightness control method of an LED display panel. Background technique [0002] The liquid crystal panel in the widely used liquid crystal display does not emit light, but relies on the backlight behind the liquid crystal panel to provide a light source to complete the display function. At present, the most used backlight source in liquid crystal panels is light-emitting diode LED. As the backlight source of liquid crystal display, LED has excellent color reproduction, good brightness uniformity, long service life and good shock resistance. It has been used in backlight devices of liquid crystal panels. middle. However, in the existing design, in order to improve the display quality and overcome its own inherent defects, people think of effectively control...

AI Technical Summary

Problems solved by technology

[0007] The prior art represented by the above-mentioned patent technology provides a variety of methods and devices for controlling the backlight by using the brightness of the backlight, but because they are based on different purposes, although they all have a certain improvement on the display quality of the liquid crystal display panel , but the control methods disclosed by them are not sufficient, and have limited effect on improving the display effect of liquid crystal displays.

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