This article introduces the gray scale displaying method of LED display and mainly focus on the algorithm parameters in the LED display's driving control mode.

介绍了LED显示屏灰度的显示方法，着重于显示屏设计中驱动控制方式的若干算法参数。

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It used RS-232 communication criteria. Through controlling circuit with 89c51 and 89c2051 as the core and back driving circuit, LED screen's various displaying mode and state is displayed.

该系统采用RS - 232通信标准，通过以89c51和89c 2051为核心的控制电路和后续驱动电路，得到了LED显示屏多种显示方式和状态。

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Compared with other driving mode, switching power technology has high efficiency, so the thesis gives a LED driver in detail with switching power technology.

与其它恒流源驱动方式相比，开关电源技术有着高效灵活的优点，因此本文基于开关电源技术给出了一种LED驱动电路。

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