借助光栅原理，让屏幕发出的光只能从正面特定角度范围内看到，从而实现「大角度防窥」的效果：
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。夫子是该领域的重要参考
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Two further complainants also questioned whether the ad encouraged or condoned drug use, due to a scene where the replacement officers picked up a prescription medication container and winked.