Liquid crystal display device and backlight control method thereof

A liquid crystal display device, comprising a liquid crystal panel and a backlight module providing backlight to the liquid crystal panel, the liquid crystal display device further comprising:

• an image data obtaining module comprising a gray level analyzing module and a saturation analyzing module, the image data obtaining module configured to obtain image data, the gray level analyzing module configured to detect and calculate average pixel brightness of the image data and compare the average pixel brightness with a gray level threshold set in the gray level analyzing module, wherein the gray level analyzing module is configured to obtain gray level information based on the image data and transmit the gray level information to a panel driving module, wherein the saturation analyzing module is configured to obtain saturation information based on the image data and transmit the saturation information to the panel driving module;
• the panel driving module, configured to be allowed to connect to the gray level analyzing module and the saturation analyzing module in response to that the average pixel brightness is less than the gray level threshold, the panel driving module driving the liquid crystal panel based on the image data, generating a first backlight driving signal based on the gray level information of the image data and a second backlight driving signal based on the saturation information of the image data, and performing a convolution operation on the first backlight driving signal and the second backlight driving signal by using a convolution operating module to output a backlight driving signal;
• and configured to be allowed to connect to the gray level analyzing module in response to that the average pixel brightness is greater than or equal to the gray level threshold, the panel driving module driving the liquid crystal panel based on the image data, generating a third backlight driving signal based on the gray level information, and serving the third backlight driving signal as the backlight driving signal to output the same;
• a backlight driving module, connected to the panel driving module for receiving the backlight driving signal, comprising a pulse width modulation module configured to modulate the backlight driving signal during a display period to form a power supplier for being provided to the backlight module.