Patent ID: 8643593
Filing Date: 2014-02-04
Classification: G09G

Abstract:
1. An apparatus of compensating image in a backlight local dimming system for estimating pixels of the image in the backlight local dimming system after backlight spreading of a plurality of backlight sources, wherein the backlight sources being arranged in a matrix form, the image being divided into a plurality of image blocks corresponding to the plurality of backlight sources, respectively, the apparatus comprising: a block dimming value decision unit, for receiving the image and calculating an average value and a maximum value for the image blocks, so as to calculate an initial value based on the average value and the maximum value for the image blocks respectively; a quality/power-saving priority decision unit, connected to the block dimming value decision unit, for generating a backlight control signal based on the average value, the initial value, a first threshold, and a second threshold for the image blocks correspondingly; a temporal filter, connected to the quality/power-saving priority decision unit, for adaptively generating a backlight pulse width modulation signal based on the backlight control signal for the image blocks correspondingly; a backlight spread approximation unit, connected to the temporal filter, for generating a backlight spread image corresponding to the image based on the backlight pulse width modulation signal; and an image compensation unit, connected to the backlight spread approximation unit, for compensating the image based on the backlight spread image, so as to generate a compensated image.