背面光是光学用语，指逆光照明。
织物背面光滑无绒并显现织纹。
在数据输入模式情况下，减小背面光照明的亮度。
In the case of a data input mode, the brightness of the backlighting is reduced.
本文改进了常规表面光电压测试少子扩散长度法，采用环形下电极消除了薄样品背面光电压信号对测量结果的影响；
The authors improved the routine steady-state surface photovoltage method to measure minority carrier diffusion length in both sides polished silicon wafers.
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