研究了用LED作为光栅光调制器的照明光源时,三基色光源数目之比和光源相干性对显示质量及颜色复现能力的影响。利用部分相干光和色度学的相关理论,比较了不同光源带宽对显示对比度和色彩显示的影响。结果表明光源带宽越小,显示对比度越高,色品图中的色三角的面积越大;此外,研究还发现三基色光源数目之比对色彩显示影响较大,当红绿蓝三色光源数目之比为2:1:1时,混色白场在色品图中的坐标与标准光源的白场坐标位置接近,并进一步得到在该比例下光源带宽和一般显色指数的关系:光源的一般显色指数随着光源带宽的减小而减小。从而为光学系统的设计提供了一个光源选择的优化方案。The influence of display quality and ability of color discrimination on different ratio of RGB light source number and different coherence of light source is analyzed,when LED is used as the lighting source for grating light modulator. By using partially coherent light and colorimetry theory,the display contrast and color display on different bandwidth is compared. The result illuminates the contrast and the area of color triangle is increasing as the bandwidth is becoming narrower,and the ratio of RGB light source number affects the quality of color display largely. The coordinate of white field is highly closed to the position of standard white light source,when the ratio of RGB light source number is 2:1:1. Meanwhile the relation between general color rendering index and bandwidth is acquired in this situation. It shows that the general color rendering index becomes less as the bandwidth is narrower. Above all,an optimized project based on the choice of light source for the design of optical system is proposed.<英文摘要>