Patent ID: 9601062
Date: 2017-03-21
CPC Classifications: G09G

Claim:
1. A backlight dimming method comprising: producing a first backlight dimming value controlling a backlight luminance of a liquid crystal display panel, wherein a screen of the liquid crystal display panel is virtually divided into a plurality of blocks, having a peripheral part of the screen comprises the plurality of blocks disposed along a peripheral of the screen, and a central part of the screen comprises the plurality of blocks disposed in a central part of the screen away from the peripheral part; producing a convex gain which has less value in the peripheral part of a screen of the liquid crystal display panel than the central part of the screen; reducing the first backlight dimming value to be applied to the peripheral part of the screen using the convex gain to produce a second backlight dimming value; controlling the backlight luminance of the liquid crystal display panel using the second backlight dimming value; analyzing a complexity of an input image; and adjusting the convex gain based on the result of an analysis of the input image, wherein the analyzing the complexity of the input image includes: calculating a histogram in each of colors of the input image data corresponding to one frame and adding a number of recognizable colors based on the calculated histogram, deciding gray levels, at which the number of pixels is equal to or greater than a predetermined threshold value, based on the histogram and calculating a sum of the gray levels to detect a number of recognizable colors from the input image to be displayed on the peripheral part of the screen; producing a first parameter, which is proportional to the number of colors from input image to be displayed on the peripheral part of the screen, wherein the convex gain is reduced in proportion to the first parameter.