基于FPGA图形字符加速的液晶显示模块

摘要

In traditional industrial control applications,Industrial Personal Computer (IPC) and LCD display is widely used,because of high-performance graphics cards in IPC. It is very convenient to design a human-computer interaction interface. However,in aerospace applications where real-time performance and reliability is most important, graphics and display integrated in LCD module is usually required to reduce the burden of processors and to improve the real-time performance of systems. This paper focuses on how to use FPGA to draw 2D graphics (including drawing point, drawing a line, circle, ellipse)that is based on Bresenham algorithm, and display dot matrix characters and bitmaps on the LCD screen,it also proposes a series of strategies about how to optimize display performance. Through simulation and practical application in a product, this LCD module based on FPGA is stable, and has good performance. It can be used in aerospace applications.%在传统的工业控制应用中,由于工业控制计算机中集成了高性能的显卡,故通常采用工业控制计算机+液晶显示器的体系结构,可方便地实现以图形和字符为主的人机界面.而在对实时性能和可靠性要求比较高的航空航天领域,通常要求液晶显示器内部集成图形显示功能,以减轻主控处理器的负担,并提高系统的实时性.重点介绍了如何利用FPGA实现基于Bresenham算法的2D图形绘制(包括画点、画线、画圆、画椭圆),以及点阵字符和位图在液晶屏上的显示,并提出了显示性能优化的一系列策略.经过仿真验证和产品实际应用,该设计方法实现的液晶显示模块图形和字符显示功能稳定,性能良好,适合于航空航天领域高可靠性液晶显示模块的应用需求.