一种基于模拟PWM的全彩色LED显示屏  

Full-color LED display by simulation of PWM

作　　者：李相国[1] 姚晓魁 赵广河[1] 

机构地区：[1]河南工业大学信息科学与工程学院,河南郑州450001

出　　处：《液晶与显示》2014年第3期361-369,共9页Chinese Journal of Liquid Crystals and Displays

基　　金：河南工业大学博士基金项目(No.2010BS006)

摘　　要：提出一种基于扫描方式模拟实现PWM功能的全彩色显示屏方案。该方案使用D触发器进行信息存储及LED通断控制,通过向D触发器写入信息控制LED的工作状态,按照PWM序列串值对D触发器周期循环写入来模拟实现PWM控制功能。详细介绍了系统的工作原理,设计实现了扫描控制器,并分析了系统参数及可行性。该方案的功耗及成本较低,具有功能上的灵活性,消除了传统扫描方式中闪烁及亮度损失问题,并具有较好的电源完整性及信号完整性。This paper presents a full-color LED display scheme based on simulation of PWM function.In this scheme,each LED is equipped with one D type flip-flop which is used to store information and control the LED on/off,and the LED status can be controlled by writing information into the D type flip-flop,thus the PWM function can be simulated and realized by writing the PWM binary code into the D type flip-flop cyclically and periodically.In the paper,the working principle of the system is introduced in detail,and the scan controller is designed carefully,and the parameters and feasibility of the system are also analyzed.Compared with traditional schemes,the proposed scheme has the advantages of lower power consumption and costs,as well as better functional flexibility; moreover,it eliminates the flickering and sacrificing brightness problem in traditional scanning scheme,and also has better signal and power integrity.

关 键 词：LED显示屏 脉宽调制 嵌入式系统 CPLD 

分 类 号：TN27[电子电信—物理电子学]