LED亮度调节中的人眼感受非线性校正  

Nonlinear Correction for Human Eye Feeling to LED Brightness Control

作　　者：琚新刚[1] 勾占锋[2] 孙华[3] 

机构地区：[1]河南教育学院电路与系统重点学科组,河南郑州450046 [2]郑州师范学院信息科学与技术学院,河南郑州450044 [3]鹤壁职业技术学院电子信息工程系,河南鹤壁458030

出　　处：《郑州大学学报（工学版）》2012年第5期138-140,共3页Journal of Zhengzhou University（Engineering Science）

摘　　要：在PWM数字调光方式中,人眼对LED灯具亮度(光通量)线性变化的感受是非线性的.为了对这种非线性感受进行校正,需要对光通量进行补偿.由于光通量和PWM占空比成严格线性关系,故根据光通量和人眼亮度感受的反非线性特性,得到人眼线性亮度感受需要的非线性变化PWM占空比即可.系统采取查找表方式,利用Quartus II平台的参数可设置宏模块,在存储器中预存按反非线性特性计算好的占空比数值,实现光通量补偿.测试显示,系统达到了校正目的.In PWM digital dimming mode, the human eye Feeling to LED lighting brightness （luminous flux） linear change is nonlinear. In order to make this nonlinear feeling has been corrected, luminous flux compen- sation is needed. Because a strict linear relationship exists between Luminous flux and PWM duty cycle, therefore, it will be done, according to the Luminous flux and the nonlinear characteristics of human eye brightness feeling, to obtain nonlinear change PWM duty cycle of human eye linear brightness feeling. LUT and LPM of Quartus II platform are used by the system, the data of duty cycle according to the nonlinear char- acteristics calculation are deposited to realize luminous flux compensation. As is shown in the test, the system gets correct.

关 键 词：亮度感受 非线性校正 占空比 LPM_ROM模块 

分 类 号：TP331.2[自动化与计算机技术—计算机系统结构]