针对高分辨率液晶显示器应满足的电磁兼容(EMC)要求, 提出了高分辨液晶显示器的电磁兼容设计方案。基于各种复杂电磁环境分析高分辨率液晶显示器应该满足的电磁兼容试验, 提出了以下3个措施: (1)高分辨率液晶显示器的外壳采用铝合金, 高分辨率液晶屏显示面采用镀膜屏蔽玻璃, 在镀膜屏蔽玻璃和外壳之间填充导电材料并确保导电连续, 电缆端口采用屏蔽接头, 外壳良好接地; (2)电源滤波器安装在电源入口且电源滤波器需要屏蔽, 该屏蔽体应与外壳良好搭接; (3)在电源滤波器与电源板之间上设置电涌保护装置和静电放电保护装置。试验结果表明: 高分辨率液晶显示器通过了各项电磁兼容试验, 符合设计要求。

A EMC design of high resolution LCD was proposed to meet the electromagnetic compatibility (EMC) requirements with high resolution liquid crystal display (LCD). The high resolution LCD should meet the EMC tests based on kinds of complex electromagnetic environment analysis, and three methods were proposed as following:(1) the enclosure of high resolution LCD used Al-alloy, the display of high resolution LCD used coated shielding glass, and the slot between coated shielding glass and enclosure was filled with conductive materials, making sure of the continuity of conductivity, moreover, the ports of power supply used the surface with shielding, and the enclosure was well grounded; (2) the power supply filter was located on the input of the power supply and shielded, while the shielding should keep good lap; (3)surge protection device and electrostatic discharge (ESD) protection device were mounted between power supply filter and the main PCB. The results of the tests indicate that the high resolution LCD could pass all the kinds of EMC tests, showing the capacity of meeting the design requirements.