某型液晶显示器夜间亮度变化不均匀, 造成用户暗环境下对信息观察不准确。本文针对上述问题, 结合设计方案进行问题分析并进行改进。即以每一档每一级的PWM输出实际测试值为基准, 进行参数调整, 保证了每一级的输出符合亮度指标要求。通过本解决方案, 当亮度数据为9时, 实测亮度为0.787 5 cd/m2, 满足指标0.726～0.921 cd/m2的要求。亮度数据0与9间的亮度实测值变化量由1.124 cd/m2改进为0.712 55 cd/m2, 9与18间的亮度实测值变化量由0246 cd/m2改进为0.772 5 cd/m2。每档之间的亮度实测值变化量相近, 变化均匀, 改善了显示效果, 满足了用户的要求。

Aiming at the problem that the changes of night brightness of a certain type of LCD is not uniform, which affects the use’s visual measurement of information in the night environment, the problem is analyzed in combination with the design scheme, and formulates the external positive measures. Based on the actual test value of PWM output of each gear and level, the parameters are adjusted to ensure that the output of each level is consistent with the brightness requirements. Through this solution, when the luminance data is 9, the measured luminance is 0.787 5 cd/m2, which meets the requirements of the index(0.726～0.921 cd/m2). The measured value in luminance between 0 and 9 is improved from 1.124 cd/m2 to 0.712 55 cd/m2, and the measured change in luminance between 9 and 18 is improved from 0.246 cd/m2 to 0.772 5 cd/m2. The variation of the measured value of true degree between each gear is similar and uniform, which improves the display effect and meets the user’s requirement.