全彩LED驱动芯片的S-PWM优化  

Optimization of S-PWM Based on Full-color LED Driver

作　　者：王巍[1] 黄展[1] 安友伟[1] 丁锋[1] 

机构地区：[1]重庆邮电大学微电子重点实验室,重庆400065

出　　处：《电视技术》2012年第21期74-76,共3页Video Engineering

摘　　要：提出了一种基于全彩LED恒流驱动芯片的改进型的S-PWM(Scrambled-PWM)实现方法。该方法将16 bit灰度数据分为两个部分:10位的高比特数据(MSB)和6位的低比特数据(LSB)。LSB灰度数据得到的灰度控制信号被划分成63个部分,MSB灰度数据则重复计数64次来得到灰度控制信号,每当MSB数据计数完成一次,LSB灰度控制信号的一个部分被添加在MSB得到控制信号的后面。即使MSB数据全部为0,也能得到均匀分散的灰度控制信号。与传统的S-PWM方法相比,该方法提弥补了传统S-PWM方法在MSB数据全部为0时的不足,提高了数据的刷新频率。An improved S-PWM（ scrambled pulse wide modulation）is proposed in this paper based on full-color LED driver with grayscale PWM con- trol. In this method,16 bit grayscale data is divided into two parts：Most significant bit（MSB,10 bit）and least significant bit（LSB,6 bit）. The Grayscale control signal generated by 6 bit LSB data will be divided into 63 parts ,meanwhile MSB data repeat count of 64 times to get the grayscale control signals. When MSB data count complete, one part of grayscale control signal generated by 10 bit LSB data is added to the end of grayscale control signals genera- ted by 6 bit LSB data. Even if all the MSB bits are zeros, symmetrical and scrambled grayscale control signals can be obtain. Compared with the tradi- tional S-PWM method, the method mentioned makes up the shortcoming of the traditional S-PWM when MSB data is all zeros,improves the data re- fresh frequency.

关 键 词：S-PWM 全彩 LED驱动 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]