色温及亮度可调的四基色LED混合白光的方法研究  

Research on Four Primary Color LED Hybrid White Light with Brightness Continuous Adjustable under Different Color Temperature

作　　者：许向阳[1] 陈广学[2] 高媛[1] XU Xiangyang;CHEN Guangxue;GAO Yuan(Shool of Communication Engineering,Shenzhen Polytechnic,Shenzhen 518055,Guangdong,P.R.China;The State Key Laboratory of Pulp&Paper Engineering,South China University of Technology, Guangzhou 510640,Guangdong,P.R.China)

机构地区：[1]深圳职业技术学院传播工程学院,广东深圳518055 [2]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《影像科学与光化学》2018年第6期507-513,共7页Imaging Science and Photochemistry

基　　金：广东省科技计划项目(2017B090901064);广州市科技计划科学研究专项重点项目(201607020045);广东省高等职业教育品牌专业建设项目资助

摘　　要：为满足配置高像素摄像头的成像设备进行成像质量检测时对照明环境的需求,本文研究了色温及亮度可调的LED光源配色技术及光源开发。选取红光、绿光、冷白、暖白LED作为四基色,设计实验装置实现色温及亮度连续可调白光光源的开发。本文研究的配色技术以四基色光源在满功率工作状态下的光谱功率分布、色品坐标和不同功率工作状态下光亮度为输入参数,依据格拉斯曼定律,以目标色温在黑体轨迹上的色坐标为函数值,以参与配光四基色的色坐标为系数、相对光亮度为变量,建立四基色配光模型。模型求解中首先以色差ΔUV≤0.005作为第一优化目标,进行循环校正直至得到的混合光色与同色温黑体颜色的视觉匹配;然后以显色指数Ra≥90作为第二优化目标,进行循环校正直至相关色温误差控制在100K以内。对开发光源的测试结果表明:使用文中开发的色温及亮度可调的混光方法,可在达到目标色温与亮度要求的情况下实现色差ΔUV≤0.003,显色指数R_a≥91。In order to provide the lighting environment for quantifying the performance of camera-equipped mobile phone,the LED light source with adjustable color temperature and brightness have been developed in this paper.Red LED light source,green LED light source,cool white LED light source and warm white LED light source were selected as the four primary colors,and an experimental device was designed to realize the development of white light source with continuous adjustable color temperature and brightness.The color matching technology studied in this paper took the relative spectral power distribution,chromaticity coordinate,and luminous flux of the four primary as the input parameters.According to Grassmann’s law,the color matching algorithm has been developed,the chromaticity coordinate of the Planckian locus are the function values,and the corresponding light flux are variables.In the model solution,the chromatic aberrationΔUV is the first optimization parameter,which should be less than 0.005.The first optimization has not been completed until the color difference is within the limit.Then the color rendering index(CRI)R a is more than 90 as optimization target,and the calculation has not been carried out until the relative color temperature error is within 100.The test results of the developed light source showed that the color differenceΔUV is less than 0.003 and R a is more than 91,when achieving the target color temperature and target brightness.

关 键 词：可调光源 色品坐标 色温 显色指数 

分 类 号：TN312.8[电子电信—物理电子学]