Backlight processing system and method thereof

A backlight processing system, comprising:

• a pixel conversion unit for receiving a frame signal and adjusting the frame signal to output the adjusted frame signal to a liquid crystal display screen;
• a frame data distribution unit for receiving the frame signal and compiling the statistics on the gray level value versus the number of pixel distribution based on the pixel gray level value distribution of the frame signal to output a relational data;
• a frame data determination unit coupled to the output of the frame data distribution unit, wherein the frame data determination unit receives a reference signal based on the relational data and the reference signal is used to represent the contrast of the frame signal;
• and
• a backlight adjustment evaluation unit coupled to the output of the frame data determination unit, wherein the backlight adjustment evaluation unit adjusts the brightness of a backlight module based on the reference signal and the backlight module emits light to the liquid crystal display screen, wherein
• the backlight adjustment evaluation unit outputs a first adjustment value to perform backlight adjustment when the reference signal is between a first reference value and a lower limit value;
• the backlight adjustment evaluation unit outputs a second adjustment value to perform backlight adjustment when the reference signal is between a first reference value and a second reference value;
• and
• the backlight adjustment evaluation unit outputs a third adjustment value to perform backlight adjustment when the reference signal is between a second reference value and an upper limit value, and the third reference value is represented by the following equation:
• Backdim=APGL/UP,
• wherein Backdim is the third adjustment value, APGL is the reference signal, and UP is the upper limit value.