基于FPGA的LED点阵触摸显示屏的设计

Design of LED Lattice Touch Screen Based on FPGA

文中所述设计给出了基于Altera公司Cyclone II系列EP2C5T144 FPGA芯片设计的LED点阵手写显示屏基本原理与实现方案。该系统由32×32LED点阵屏、点阵屏驱动电路、光电手写笔、键盘、模式与坐标显示板和主控制器组成。系统以主控制器为核心,控制LED点阵屏在微亮和全亮间切换,当光电笔在屏上划过时先由微亮信号获取屏的行列坐标,再根据实际功能需要决定是否将该点LED完全点亮为常态,从而在LED屏上实现点亮、划亮、反显、整屏擦除、笔画擦除、写多字等触摸屏实现的功能。

This design gave LED lattice touch screen basic principle and implementation of these based on Altera Corporation Cyclone II series EP2C5T144 FPGA chip. This system is composed of 32 × 32 the lattice LED board, the LED board driving circuit, the electro-optical writing pen, the keyboard and the coordinate display panel and the master-control unit. The master-control unit is a core of system, it get screen coordinate when the writing pen scratch the micro bright screen first, then decided the corresponding LED to lighten completely according to the actual functional need, thus the LED screen realizes lightens, writing single or multi-characters, the highlighted, the entire screen to scratch, cleaning the stroke and so on.