材料期刊网

近年全彩色的LED视频显示屏得到了广泛的应用.但是很多全彩色LED显示屏会随着环境温度的变化,出现显示色彩畸变的现象.在不同环境温度下,由于LED器件的特性使LED显示屏的红、绿、蓝色的显示亮度都会不同程度地发生偏移,其中蓝色LED的亮度偏移量较小,红色LED的偏移量较大.LED的这种特性严重影响了全色显示屏的白场平衡,导致显示屏色度发生畸变.文章根据LED的环境特性,提出了一种亮度补偿技术,来修复由温度引起的RGB三基色LED的亮度,以校正全色显示屏的色度畸变问题.文中为了补偿RGB三基色的亮度误差,提出根据不同的环境温度,设定RGB三基色的伽玛校正曲线,使LED显示屏在不同灰度级情况下,得到不同的亮度补偿,以获得高质量的图像.

Full color LED video display systems are getting popular in recent years. However, there is different luminance in the same bright image due to environment temperature variation. The degrees of intensity deviation of red, green and blue color of LED change with environment temperature, the brightness of blue LED drifts slightly and that of the red LED seriously. This characteristic may seriously destroy the white balance of LED and make the picture color aberration. In this paper, a technique based on gamma correction of RGB is presented to control the color of LED. The independent gamma parameters of RGB colors are set up respectively in the system. The system gives a gamma parameter for each RGB color in every 20 ℃ referring to the normal temperature. In order to compensate the brightness change due to LED temperature characteristic, a detecting circuit of environment temperature is used in the system. According to environment temperature, the system use varying gamma parameters to adjust the luminance of RGB to get high quality image display.