Projection Screen, Projector Curtain, This technology involves a triangular, black, horizontal lenticular structure, which is coated with reflecting material on the side facing the UST projector. The black topside of the reflector absorbs ambient light from above, while light from the projector is reflected or diffused by the white coating and sent towards the audience. Best image contrast is achiecved when the projector is below the screen and the reflector is pointing downwards. The screen is exclusively for table-mounted ultra-short throw projectors. If you need to install the projector mounted in the ceiling, you can turn the screen upside down easily. Our UST ALR screen material is the best choice of the UST laser projector, it is with special optical sawtooth structure and the light-rejecting filter to give a stunning performance in ambient light. Images are reproduced without the hot-spotting of other screens that rely on high gain to overcome ambient light. Also, it has no light-reflection.