目前,医院门诊叫号显示器大多由分立元件和小规模集成电路组成,接点多,体积大,成本高,且容易出故障,往往只用上几个月就坏了.使用单片微机组装的叫号显示器能克服上述缺点.其电路设计原理还能应用到诸如铁路列车车次显示、街头大型时钟和噪声分贝值显示,以及活动电脑广告等领域,适用面很广.一、点阵式显示器的结构本叫号器采用点阵式显示结构,这是目前比较通用的显示形式。它由35个电珠排成5x7的点阵,构成一 At present, the hospital outpatient call number display mostly composed of discrete components and small scale integrated circuits, contacts, large size, high cost, and prone to failure, often only a few months on the broken. The use of single-chip microcomputer assembly called No. display can overcome the above shortcomings. The circuit design principles can also be applied to such as railway train trips, large street clock and noise decibel value display, as well as mobile computer advertising and other fields, a wide range of applications. This device uses a dot matrix display structure, which is currently more common form of display. It consists of 35 beads arranged in 5x7 dot matrix form one