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0.7的DMD芯片，在操作过程中，发现镜面反射的光线最强，正负12°反射的光强度很低。DMD芯片上面有一层透明的膜，是这个膜产生了反射吗，需要撕去么？
光学设计请参考：
http://www.ti.com/lit/pdf/dlpa022
DMD表面不要做操作，玻璃是特别镀膜优化的。
