电流调光模式对LED液晶模组光学性能的影响  

Effect of Different Current Dimming Mode on Optical Performance of LED LCD Module

作　　者：姚健平[1] 杨梅慧[1] 

机构地区：[1]康佳集团股份有限公司,广东深圳518053

出　　处：《电视技术》2015年第13期103-106,共4页Video Engineering

基　　金：电子信息产业发展基金项目(财建[2010]305号;工信部财[2010]301号)

摘　　要：对LED液晶模组,采用模拟调光ADIM和数字调光PWMDIM两种电流控制模式,对比测试了模组的亮度、CIE色坐标、LED焊脚温度数据。实验数据表明,相同整机系统下,平均电流相同时模拟调光比数字调光亮度高、LED芯片温度低。随着平均电流的减小,数字调光的亮度下降幅度比模拟调光明显。数字调光模式CIEγ坐标变化比模拟调光小,但x坐标差异不大。通过对以上两种模式下光谱图中RGB各波段的光强变化比以及主波长情况进行分析,认为半导体材料温度变化引起的能带差异以及电光转换效率不同是主要原因。The brightness, CIE color coordinates, and the LED pin soldering temperature data are tested in analog dimming （ADIM） and digital dimming （PWMDIM） current control modes on LED LCD module. The experimental data show that, under the same average current system, analog dimming get higher brightness and lower temperature of LED chip. With the decrease of the average current, brightness for digital dimming decline significantly. Under the same average current system, the change of CIE y coordinate in digital dimming mode is smaller, but the x coordinate has no significant change. Changes in light intensity of each band in the RGB spectrum and the main wavelength are analyzed in two current modes. All those are considered caused by the changes in temperature of semiconductor materials which has resulted in different band gap and different electro-optical conversion efficiency.

关 键 词：模拟调光 数字调光 LED 电流 亮度 色坐标 

分 类 号：TN942.1[电子电信—信号与信息处理]