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

Abstract

The invention discloses an LED backlight driving method, a driving device and a driving circuit. The method includes generating a dimming signal including dimming delay time information matching with the switching time of a liquid crystal light valve; according to the dimming The signal drives the LED backlight. When the liquid crystal television of the present invention presents a 3D image picture, the dimming signal generated by the signal generating device adds the dimming delay time information matching the switching time of the liquid crystal light valve, which can eliminate the switching time of the liquid crystal light valve. In addition, because the present invention also increases the information of increasing the driving current and reducing the information of the driving output duty cycle in the dimming signal, it can improve the display quality of the image screen. In addition to brightness, the average power consumption of its LED backlight remains unchanged.

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