The LED(light-emitting diode) dot matrix screen is constitute of computer, data transfer unit and display unit.
大型LED（发光二极管）显示屏由计算机、数据转换单元与显示单元组成。
2
Provide regular maintenance and service for the central processing unit, the printer, the display, the mouse, and the keyboard. Deal with the usual troubles in the computer system.
定期清理保养系统主机、打印机、显示器、鼠标、键盘，并处理系统常见故障。
3
As a result, an unauthorized person is prevented from operating a computer or viewing information from the displayunit when the system unit is booted by a WOL function and a control method thereof.