本项目设计一个智能的超低成本LED点阵显示屏。该显示屏是由微控制器、LED点阵、以及开关多路器、电源管理芯片等相应的元器件组成的独立系统。显示屏可以在不借助任何外部传感器的情况下由外部激光笔进行远距离书写，并且智能地识别出激光笔的命令，完成相应显示功能如：划亮、清屏、擦除、反显、对象拖移、帧储存等。项目基于标准LED在特定状态下的光伏特性，充分利用ADI芯片高速、高精度的特点，通过反电动势检测法对其光伏特性进行检测，使得普通廉价的单个LED同时具有发光和光检测功能，然后构成阵列，使之成为能由激光笔指挥控制的智能显示屏。

　　LED Lattice for Laser Writting

　　The project proposed a low cost intelligent LED dot screen. The screen includes a micro-controller, LED dot array, ADC, DAC, switching multiplexer, power management chips and other components form the corresponding stand-alone systems. Screen can be carried out by an external laser pointer remote write, and intelligently identify Laser Pointer in order to complete the appropriate display, such as: planning bright, clear screen, erase, anti was, drag the object, the frame storage.Based on common inexpensive LED, the system detects the photovoltaic of LED to detects extenal lighting with a particular method. When making the full adventage of ADI chip high speed and precision of the photovoltaic properties of their characteristics, making it works as an intelligent command and feasible LED dot array screen.

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