基于CPLD的TFT—LCD控制器的设计

摘要

文章介绍了一种基于CPLD的TFT-LCD控制器的设计和实现方法。增加片外SRAM，以提供显示缓存。并使用CPLD实现两大主要功能，一是产生TFT—LCD要求的时序信号，二是协调TFT-LCD和MCU对SRAM的读写访问。相对于常见的TFT—LCD控制器，该设计方法优势明显：结构简单，并且性价比高，驱动小尺寸TFTr屏时具有较高应用价值。%This paper introduces a design method of CPLD-based TFT-LCD controller. By adding an off-chip SRAM , the display buffer is offered. At the same time CPLD realizes two main functions. One is to generate the timing signal needed by TFT-LCD. The other is to coordinate both the operation of reading SRAM by TFT-LCD and the operation of writing SRAM by MCU. Relative to other common TFT-LCD controller, this method owns some obvious advantages： the structure is very simple, and it＇s cost-effective. So this method has highly practical value when driving small TFT liquid crystal display.