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
Pressing this button will also illuminate the displayscreen for 10 seconds if power unit is in battery operation (screen will always be illuminated in mains operation).
如果使用电池供电，点摁此按钮后，显示屏仅显示10秒钟(在主要操作时，显示屏始终明亮显示的)。
3
A laser display system consisting of laser, graph input unit, drivers, optical stage and large screen is developed.