High Contrast glass bead

Another technique uses a single layer of microscopic bead lenses, set into a thin black light-absorbent layer. Only a small fraction of the glass bead lens penetrates the black layer. In this way the glass bead lens will pick up light from the projection side and pass it through the black layer to the viewing side with very little light loss. Ambient light striking the front of the screen will on the other hand be effectively absorbed.

absorbing ambient light

                                              Fig 33_3

Contrast enhancement  Combinations >



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