Patent ID: 8654060

Claim:
A processing device of high dynamic contrast for liquid crystal display apparatus, characterized in comprising: a receiver, receiving a low voltage Differential Signaling data, and performing a format conversion on said data; a central processing module, performing a histogram statistical process on the data subjected to the format conversion, obtaining a backlight source dimming coefficient and a Gamma reference voltage parameter of the same frame of picture according to the result of the statistical process, generating a pulse wide modulation dimming control signal and a Gamma reference voltage; an inverter, receiving the pulse wide modulation dimming control signal from said central processing module, and driving the backlight source; and a source driving IC, receiving the Gamma reference voltage from said central processing module, and driving a liquid crystal panel, whereby the luminance of the liquid crystal panel is kept unchanged after the luminance of the backlight source varies by changing the transmissivity of the pixel points on the liquid crystal panel and gray scales data of the pixel points distributed on the liquid crystal panel are the same as input data without losing any gray scale details, wherein the transmissivity of the pixel points on the liquid crystal panel is changed by adjusting the voltage of the pixel capacitor on the liquid crystal panel according to the Gamma reference voltage parameter; wherein obtaining the backlight source dimming coefficient of the same frame of picture comprises: judging whether a target dimming coefficient for the picture of a present frame is equal to a final dimming coefficient for the picture of a previous frame; if so, setting the target dimming coefficient for the picture of the present frame as a final dimming coefficient for the picture of the present frame; otherwise, judging whether the target dimming coefficient for the picture of the present frame is equal to the target dimming coefficient for the picture of the previous frame, if so, adjusting the dimming coefficient for the picture of the present frame by adding a step value same with that of the picture of the previous frame to the final dimming coefficient for the picture of the previous frame, and setting the adjusted backlight source dimming coefficient as the final dimming coefficient for the picture of the present frame; otherwise, redetermining the step value of the backlight source dimming coefficient, and obtaining the final dimming coefficient for the picture of the present frame according to the redetermined step value.