This paper designed a scheme of electric vehicle digital instrumentation based on the controller chip of LPC1788 of a core of ARM Cortex-M3,and the application of embOS operation system & emWin graphical user interface.The paper described an instrumentation of the hardware design.In the software,it introduced the whole software structure and software design flow chart.Then it introduced the transplant of the embOS operating system & emWin graphical user interface.Finally,this paper specified the LCD display interface and the practical test for one electric car manufacturer.Using emWin graphical display interface has been guaranteed on a good display and refresh speed.The experiment proves the LCD digital instrumentation satisfies the practical using requirements,and compared with conventional dashboard,the LCD digital instrumentation have more user-friendly design.%采用基于ARM Cortex-M3内核的LPC1788为主控芯片,应用embOS操作系统和emWin图形库设计了电动汽车液晶仪表.首先介绍了电动汽车液晶仪表的整体硬件设计；软件部分介绍了软件整体架构和流程,并详细介绍了em-bOS操作系统的移植和如何利用emWin开发图形显示界面；最后给出了为某电动汽车厂商设计的液晶显示界面.利用emWin图形库设计电动汽车液晶仪表保证了良好的显示效果和运行速度,液晶仪表可以满足实际的使用需求,比常规仪表更具人性化.
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