一种新颖的脉宽调制平均分割调光算法的设计与实现  

Design and realization of a novel average separated PWM dimming

作　　者：代国定[1] 李卫敏[1] 徐洋[1] 虞峰[1] 王悬[1] 

机构地区：[1]西安电子科技大学超高速电路设计与电磁兼容教育部重点实验室,陕西西安710071

出　　处：《光电子．激光》2009年第11期1434-1437,共4页Journal of Optoelectronics·Laser

基　　金：国家部委预研基金资助项目(9140A08010208DZ0123);西安应用材料创新基金资助项目(XA-AM-200817)

摘　　要：提出了一种新颖的16bit脉宽调制(PWM)平均分割调光算法,其映射电路满足LED光亮度在0～100%间精细调光。该算法将整个PWM周期均分为多个小的灰度周期,同时对灰度数据权值位进行分割处理,以克服高权值位对灰度均匀性的影响,提高了灰阶亮度的视觉刷新率,且有效消除低亮度时的闪烁问题。采用HSIM对整体电路进行了仿真验证,结果表明,PWM输出波形具有良好的均匀性。基于TSMC0.6μm BCD工艺实现的调光电路有效芯片面积小于0.3mm2,对采用本设计的一款RGBLED驱动芯片进行流片、测试,验证了该调光电路能够正常工作。A novel 16 bit average separated PWM algorithm is presented with which the driver can precisely dim LED light output over the full range from 100% to 0%.Compared with conventional PWM dimming.the PWM waveform is averagely divided into several sections in a whole PWM period.and the grayscale data are separated by binary power value,in order to enhance the uniformity of the gray and diminish the influence of high significant bit on uniformity.Furthermore,this progressive algorithm could efficiently reduce fli...

关 键 词：脉宽调制(PWM)调光 平均分割算法 视觉刷新率 RGB LED 

分 类 号：TN787.2[电子电信—电路与系统]