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US 4,767,186 AGranted
Front projection screen with rear light concentrating lens array
AssigneeNorth American Philips Consumer Electronics Corp.
InventorsRalph H. Bradley, Jr., William F. Guerinot
Life of this patent
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Abstract
LCD color television front projection screen has a rear vertically oriented lenticular lens array, the sidewalls of the lenticules steeply inclined to achieve total internal reflection of rays from a projected image into tip regions of the lenticules, an external reflective surface behind the array for reflecting the projected rays back into an audience field in front of the screen, and black masking between the lenticules for absorbing ambient rays.
Claims23
Front projection screen having:
- a light transmissive layer having a front surface and a rear surface defining a lenticular lens array comprising sequentially adjacent lens elements, each element having a tip portion and sidewall portions, the sidewall portions steeply inclined to direct light from a projection source by total internal reflection to the tip portions;
- external light reflective means adjacent to at least the tip portions for reflecting the directed light back through the screen and into an audience field;
- and
- light-absorbing means adjacent to at least the sidewall portions for absorbing ambient light.
1 more element
Dependencies are inferred from the claim text.