基于PSNR的LCD区域动态背光调节方法  

A Control Algorithm of LCD Dynamic Backlight Based on PSNR

作　　者：章小兵[1,2,3,4] 刘欣[4] 刘波 韩江洪[3] 吴华夏 

机构地区：[1]中航华东光电有限公司国家特种显示工程实验室 [2]中航华东光电有限公司现代显示国家重点实验室,安徽芜湖241002 [3]合肥工业大学计算机与信息学院,合肥230009 [4]安徽工业大学电气信息学院,安徽马鞍山243002

出　　处：《光电工程》2012年第8期129-134,共6页Opto-Electronic Engineering

基　　金：安徽省年度重点科研项目(11070203004);安徽省博士后基金(200902)

摘　　要：动态背光对于液晶显示器降低功耗具有重要意义。考虑到在降低功耗的同时更重要的是保证显示器画面的质量,本文提出了一种液晶显示器分区域动态背光的新方法。该方法认为峰值信噪比为30是图像保质的最低标准,将失真限制在一定范围内,采用倒推法得到背光亮度。与此同时,本文提出了简化运算时间的方法,就是以区域最大灰阶亮度值的0.7倍、0.8倍和0.9倍依次搜索,直到满足RPSNR≥30就停止。为了保证图像不过于昏暗,以区域最大灰阶亮度值的0.7倍最为最小背光亮度值。该方法大幅度节约了运算时间,便于硬件实现。Dynamic backlight plays an important role in reducing power consumption of liquid crystal displays Considering it is more important to make sure a high quality of the displayed image when reducing power consumption, a new algorithm was proposed for local backlight dimming of liquid crystal displays. According to the algorithm, PSNR （the peak signal-to-noise ratio） =30 was the lowest standard to guarantee the quality of image, by which the backlight luminance was gained and the distortion was controlled into a certain range. Meanwhile, a method is also proposed to simplify the calculation. Successive searches will be made on the basis of the 0.7, 0.8 and 0.9 times of the maximum luminance, and stop when RpSNR≥30. In order to guarantee the quality of the image, the 0.7 times of the maximum luminance is used as the minimum backlight luminance. It saves much time in calculation and-is better applied in hardware

关 键 词：液晶显示器 背光 动态背光 峰值信噪比 

分 类 号：TN27[电子电信—物理电子学] TN873