Patent ID: 8717277
Filing Date: 2014-05-06
Classification: G09G

Abstract:
1. A method of approximating backlight spread in a local dimming system, for use in an LCD device to estimate a backlight spread image corresponding to an image after backlight spreading of a plurality of backlight sources, wherein the image, the backlight spread image, and the LCD device having same resolution, the backlight sources being arranged in a matrix form, the method comprising the steps of: (A) receiving backlight pulse width modulation signals from the backlight sources for performing an equalization operation on the backlight pulse width modulation signals and generating equalization signals correspondingly; (B) establishing a backlight seed image based on the equalization signals; (C) calculating a plurality of positions corresponding to the backlight seed image based on coordinates of the backlight spread image; (D) calculating coordinates of the backlight seed image corresponding to the plurality of positions; (E) calculating distance differences between the plurality of positions and the coordinates of the backlight seed image; and (F) performing a bilinear transformation on pixels of the backlight seed image and the distance differences so as to generate the backlight spread image.