Method for integrally and dynamically adjusting LED backlight

Abstract

The invention provides a method for integrally and dynamically adjusting LED backlight. All LEDs in a backlight system of a liquid crystal display television serve as an integrated light-emitting area; superposition is carried out on RGB numerical values of all pixels in video signals to obtain a superposition value of the pixels, and a result obtained by the superposition value divided by the resolution of the liquid crystal display television is divided by 3 to obtain the brightness value of the liquid crystal display television; the brightness value of the liquid crystal display television serves as the numerical value of a PWM duty ratio to be sent to a driver chip of the backlight system of the liquid crystal display television at last, and the driver chip of the backlight system is adjusted to backlight of the liquid crystal display television according to the brightness value. Therefore, the phenomenon of a halo of partially dynamic backlight is effectively solved, power consumption in the whole process is low, and meanwhile the integral backlight can be adjusted according to the brightness of pictures.

Description

technical field [0001] The invention belongs to the technical field of dynamic lighting driving of LED backlights, and relates to a method for overall dynamic adjustment of LED backlights. Background technique [0002] At present, most of the backlights used in large-size LCD TVs are LED backlight systems, which have replaced traditional CCFL backlights. There are many types of LED backlights, including direct-lit and side-lit backlights. , the direct type backlight is divided into three-color LED backlight and white LED backlight, and the calculation method is divided into local dynamic statistics and overall full-brightness technology. This is a relatively common backlight statistical method in the market at present, but these two statistics are They have their own advantages and disadvantages. Dynamic statistics can improve contrast and save power consumption, but there will be obvious halo phenomenon (firefly effect), and all constant lights have no halo effect, and the ...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the backlights used in large-size LCD TVs are LED backlight systems, which have replaced traditional CCFL backlights. There are many types of LED backlights, including direct-lit and side-lit backlights. , the direct type backlight is divided into three-color LED backlight and white LED backlight, and the calculation method is divided into local dynamic statistics and overall full-brightness technology. This is a relatively common backlight statistical method in the market at present, but these two statistics are They have their own advantages and disadvantages. Dynamic statistics can improve contrast and save power consumption, but there will be obvious halo phenomenon (firefly effect), and all constant lights have no halo effect, and the brightness is very large, but power consumption is relatively expensive, and contrast ratio is relatively high. Small