加固液晶显示模块需要通过高温环境试验, 以保证环境温度较高时仍能工作。建立了加固液晶显示模块的有限元分析模型, 测试了常温下的温度分布, 通过将仿真结果和实际测试数据相比较, 对模型进行了优化, 保证了仿真结果的精度。在此基础上, 仿真分析了不同环境温度、不同驱动电流下液晶屏和LED背光板上的温度分布。仿真结果表明: 当环境温度升高到65 ℃时, 必须将LED驱动电流降低到150 mA, 才能保证液晶屏温度不超过清亮点, LED结温不超过最大限制值。

A rugged LCD has to pass the high-temperature environmental test to make sure that the LCD can still work even when the ambient temperature is high.A finite element analysis model of a rugged LCD was established in the paper.A rugged LCD was tested to get the temperature distribution.Based on the comparison of simulation results and practical results, the model was optimized and the precision of the simulation results were guaranteed.The temperatures of LCD and LED backlight board at different ambient temperatures and with different drive currents were simulated.The results show that when the ambient temperature reaches 65 ℃, the drive current should be lowered to 150 mA to make sure that the temperature of the LCD is below the LC clear point and the joint temperature of LED is not higher than the maximum limited value.