Patent ID: 8368638
Filing Date: 2013-02-05
Classification: G09G

Abstract:
1. A method of controlling a brightness of a liquid crystal display, comprising: inputting a video signal by a frame unit; detecting an average picture level (APL) value of the inputted video signal; if the detected average picture level (APL) value is equal to or greater than a reference value, increasing or decreasing a brightness of a backlight according to an inverse proportional curve having a prescribed proportional constant; and if the detected average picture level (APL) value is smaller than a reference value, increasing the brightness of the backlight according to the average picture level (APL) value by limiting the brightness of the backlight to a prescribed brightness for a preset reference section of an average picture level (APL), wherein the inverse proportional curve having the prescribed proportional constant (L) is based on the following formula: Backlight brightness=1/(L*screen size*APL), where L is a constant of brightness stimulating eyes.