一种节能电视调光技术的研究

Research on a Dimming Technology for Energy Saving Television

为了解决液晶屏幕在暗场景下容易出现闪烁、底亮偏亮的问题,基于影像画面的亮度,本文提出一种结合脉冲宽度调制(PWM)调光和模拟调光相互互补式的自适应全局调光技术。采用PWM调光与模拟调光相结合技术自适应算法,PWM调光采用低频PWM输出控制PWM占空比,模拟调光采用高频PWM输出控制LED导通电流。利用影像处理技术能够动态获取影像图像,通过平均值法将图像内容转化为灰度值,并进行实时即时算法处理,根据所设计的全局调光技术自适应算法提取出所对应的LED灯亮度值,通过图形处理器芯片控制背光模组驱动所有LED灯的亮度。

In order to solve the problem that LCD screen is prone to flicker and becomes too bright in dark scenes,an adaptive global dimming technology combining PWM dimming and analog dimming is proposed.Based on the brightness of the image screen,using PWM dimming and analog dimming technology adaptive algorithm,PWM dimming uses low frequency PWM for controlling,analog dimming uses high frequency PWM for controlling LED conduction current.Image processing technology can be used to dynamically acquire image.The image content is converted into gray value by means of average value method,and the real-time algorithm processing is carried out.According to the adaptive algorithm of global dimming technology,the corresponding LED brightness value is extracted and the brightness of all LED lights is driven by the backlight module controlled by the graphics processor chip.