面向亮室对比度测量应用的高精度可变环境照明条件控制系统设计

针对目前显示器的亮室对比度性能测试方法中照明条件设置难度大及可调整性差等问题,提出了一种采用积分球和大功率彩色LED的可变环境照明条件控制系统.大功率LED采用WRGB四种颜色,其中白光作为主光源提供照度,其他3种有色光源主要用来对模拟照明环境的相关色温进行修正,这4种LED通过一定比例混合,可在积分球内部形成指定照度和相关色温值的均匀漫反射光照条件,以此来模拟实际的环境照明条件.经过实验验证,本系统模拟光照条件照度的相对误差可控制在5％以内,相关色温的相列误差可控制在1％以内.

Design of a Variable Ambient Lightening Control System for Bright-Room-Contrast-Ratio Measurement

The available measurement of Bright-Room-Contrast-Ratio has some problem in ambient illuminance preparation and adjustable range.Based on integrating sphere and power WRGB LEDs,a new ambient lightening condition control system is presented.The white LED acts as the main illumination source,while the other three ones are devoted to amending the correlated color temperature.By mixing the lights of the four LEDs in fixed proportion,we can get a uniform diffuse illumination condition inside the integrating sphere with the appointed illumination and correlated color temperature.The results show that the relative errors of illumination and correlated color temperature are less than 5% and 1% respectively.