Backlight smoothing method applied to liquid crystal display dynamic dimming and device

The invention provides a backlight smoothing method applied to liquid crystal display dynamic dimming and a device. According to the backlight smoothing method, nonlinear interpolation is carried out on the known backlight brightness of the central points of four backlight partitions two times, and the backlight brightness of any pixel point in a rectangular region formed by the four points is obtained. The device for achieving the method is composed of an address selection module, a backlight brightness storage module, a lookup table module and a backlight smoothing operating module. Compared with linear interpolation, the backlight smoothing method enables backlight obtained through the nonlinear interpolation to be smoother, the smoothed backlight is made to accord with actual conditions better, the method is suitable for a side entering backlight type and a direct type backlight type, and the problem that boundary image gradation is discontinuous due to dynamic dimming is effectively solved. The device for achieving the method is simple in structure and easy to implement.