直下式LED背光TV色域的研究

Research on the Gamut of TV with Direct Illumination LED Backlight

分析了影响直下式LED背光TV色域的各种因素,研究了光学材料与液晶面板对白光色度坐标的影响,结果表明光学材料、液晶面板对白光色坐标的平均偏差值分别为(-0.0285,0.0270)、(0.0139,0.0015);研究了光学材料、LED光源以及液晶面板对TV色域的影响,结果表明:(1)不同厂家光学材料色域差距仅为0.2%;(2)不同液晶面板贴合相同的LED背光,色域相差22.8%;(3)从白光两波段LED到三波段LED再到RGB LED的背光,色域依次从75.3%、84.2%、104.5%。因此,要实现特定的色彩,需综合考虑每个部分对白光色度坐标的影响;另外,要获得高的色域范围,需选取与液晶面板相对应的LED光源。

Variation of chromaticity coordinates under different optical materials and LCD panels were firstly studied,and the results showed that average deviation of color coordinates under optical materials is(-0.0285,0.0270),then the value under LCD panels is(0.0139,0. 0015).Secondly,the gamut of TV were researched,and the results showed that:(1)The gamut gap under different optical materials is only 0.2%;(2)The gamut gap under different LCD panels which attached to the same LED is 22.8%;(3)Backlight with two bands white LED can achieved 75.3% NTSC,while 84.2% NTSC with white LED of three bands,and 104.5% NTSC with RGB LED respectively.Therefore,each part of the comprehensive influence of chromaticity coordinates must be considered to accomplish a specific color;In addition,LCD pannel and the corresponding LED light source are needed to obtain high color gamut.