CBSP is a prism-based optical screen designed to block light coming from the ceiling, giving you clear, high-contrast images in bright rooms. Its optical structure is shaped like a right-angle triangle, letting the projector’s light pass while rejecting overhead light.
1️⃣ Ceiling-Mounted UST Changes the Light Path
If you mount a UST (Ultra Short Throw) projector on the ceiling, the prism that normally blocks ceiling light can also block some of the projector’s own light. This reduces brightness and image quality.
2️⃣ Turning the Screen Upside Down Isn’t a Solution
What if we turn the screen upside down during production so it won’t block the projector?
While this would let the projector’s light through, it also loses the ceiling light rejection—the main purpose of CBSP.
Turning it upside down may also block light from lower angles, so if you watch from a sofa slightly above or to the side, parts of the image can appear washed out.
Check out our CBSP series for screens optimized for bright-room viewing!
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