LED分区背光光扩散性能研究

液晶显示器的区域动态调光技术中，各分区背光确定后，为了保证背光降低后的亮度和显示效果，需要对液晶像素进行精确补偿。本文采用低通滤波方法模拟LED 背光源在背光模组中传播时的扩散过程，得到光扩散函数模板参数，进而得知各像素的实际背光亮度，据此对液晶像素进行精确补偿。在直下式LED 分区背光液晶显示系统上，通过具体图像验证了该方法的准确性。该方法采用常见的测试设备，可操作性强，精度高。经验证，背光分区为32 个时，32 个分区的相对误差平均值为6.41%。在动态区域调光液晶电视样机中实现了本文的扩散方法，和没有调光的电视相比，节能率达到27.06%，画面无拖尾现象。

Abstract

In Liquid Crystal Display (LCD) backlight local dimming technology, to ensure the resulting image quality and luminance, accurate pixel compensation is necessary after each region backlight level been determined. Low pass filter was used to simulate the process of Light-emitting Diode (LED) backlight diffusion to get the LED light spread function and the actual backlight level of each pixel, and then according it to compensate the pixel. On the direct-backlight LCD,specific images were used to verify the accuracy of the method. This method with common test platform has a high precision and a simple system. The experimental validation results show that the average relative error is 6.41% when the number of the direct-backlight region is 32. The diffusion method was used in the dynamic local dimming LCD TV. The energy-saving rate reaches 27.06%, and the screen appears no tailing phenomena.

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LED分区背光光扩散性能研究

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