Light-emitting diode (LED) backlight driving method, drive device and drive circuit

Abstract

The invention discloses a light-emitting diode (LED) backlight driving method, a drive device and a drive circuit. The method comprises the following steps of: generating a dimming signal which comprises dimming delay time information matched with the switching time of a liquid crystal light valve; and driving an LED backlight according to the dimming signal. When a liquid crystal television shows a three dimensional (3D) image picture, the dimming delay time information matched with the switching time of the liquid crystal light valve is added in the dimming signal generated by a signal generation device, so that a phenomenon of picture tailing caused by delay generated in the process of switching the liquid crystal light valve can be eliminated. In addition, drive current increasing information and drive output duty ratio reduction information are added in the dimming signal, so that luminance displayed by the image picture can be improved, and the average power consumption of the LED backlight is invariable.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to an LED backlight driving method, a driving device and a driving circuit of a liquid crystal television with an LED backlight module. Background technique [0002] Now, more and more LCD TVs have begun to adopt LED backlight technology, whose main advantages are long service life, power saving and energy saving, and convenient driving. [0003] At present, there are mainly two types of LED backlight solutions: [0004] One is the direct type, in which a number of LED lamps are directly arranged under the display screen, so that the picture can be displayed by lighting up the LED backlight when necessary. [0005] The other is the side-in type, several LED lights are distributed on the side of the display screen, when necessary, the LED backlight is turned on, and the light is evenly directed to the display screen through the light guide plate arranged parallel to the display...

AI Technical Summary

Problems solved by technology

However, due to the delay in opening and closing of the liquid crystal light valve during the switching process of the liquid crystal light valve, people usually have smearing and ghosting in the image they see, and even one eye can see Seeing the content of the other glasses, which causes eye fatigue and affects the user's normal viewing

In addition, the liquid crystal light valve will also attenuate the light during the switching process of the light. Therefore, in this 3D function state, the image that the user can watch is relatively dark, so it also causes the user to a certain extent. eye discomfort

Images