基于S3C2440的LED背光源节电系统设计

Design of LED Backlight Luminance Scaling System for Power Minimization Based on S3C2440

背光源的功耗最高可占液晶显示模组总功耗的50%以上,文章提出一种基于直方图变换的背光源节电调光方法,在ARM平台上通过直方图的裁剪、搬移和拉伸对图像进行处理,其后利用脉宽调制降低LED背光源亮度,实现节能的目的。实验证明,文章提出的方法在失真度为5%的情况下可实现背光节电约35%。

Backlight is the largest consumer in LCD displays, mostly accounting for 50% of the power. In order to increase the energy saving property of the backlight, this paper proposes a histogram transformation guided backlight luminance scaling method for power minimization. Image histogram clipping, moving and extension strategy are imported based on ARM hardware. LED backlight is then dimmed using pulse modulation and power is minimized, Experiments show that the algorithm can save about 35% backlight energy consumption with 5% image distortion.