direction a backlight
方向a背光
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In the backlight design, a major goal and challenge is to ensure that light efficiency has been enhanced in the direction that is perpendicular to the propagation direction of light.
在背光的设计中，一个主要的目标和挑战是保证在垂直于光的传播方向上提升光的利用效率。
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