Backlight unit and driving method thereof as well as liquid crystal display device

Abstract

The invention discloses a backlight unit which comprises a backlight module, a voltage generation unit, a backlight control unit and a backlight driving chip, wherein the backlight module comprises a light source used for emitting light, and the voltage generation unit is used for supplying driving voltage for the backlight module; the backlight control unit is used for receiving a frame frequency signal and generating a cycle control signal according to the frame frequency signal, and the cycle control signal has a cycle same with that of the frame frequency signal; the backlight driving chip is used for generating a PWM signal according to the cycle control signal and a preset duty ratio, the PWM signal has a cycle same with that of the cycle control signal, and the duty ratio of the PWM signal in every cycle is D; the PWM signal is used for controlling the voltage generation unit to supply or cut off the driving voltage for the backlight module. The invention further discloses a driving method of the backlight unit as well as a liquid crystal display device comprising the backlight unit.

Description

technical field [0001] The present invention relates to the technical field of liquid crystal displays, in particular to a backlight unit and a driving method thereof, and to a liquid crystal display device including the backlight unit. Background technique [0002] Liquid Crystal Display (LCD) is a flat and ultra-thin display device, which consists of a certain number of color or black and white pixels, and is placed in front of a light source or a reflective surface. Liquid crystal displays have low power consumption, high image quality, small size, and light weight, so they are favored by everyone and become the mainstream of displays. A liquid crystal display generally includes a liquid crystal panel and a backlight unit. The liquid crystal panel and the backlight unit are disposed opposite to each other. The backlight unit provides a light source for the liquid crystal panel to display images on the liquid crystal panel. [0003] Some existing liquid crystal displays u...

AI Technical Summary

Problems solved by technology

As mentioned above, in the existing method of synchronizing the driving signal of the backlight unit with the frame frequency signal, when the frame frequency signal changes suddenly, the duty cycle of the backlight unit’s turn-on time is inconsistent with the preset duty cycle in the corresponding frame picture. , affecting the display quality of the LCD panel

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