Contrast improving sheet and rear projection screen provided...

Details Contrast improving sheet and rear projection screen provided... Contrast improving sheet and rear projection screen provided...

2007-08-07

2007-08-07

Perkey, W B (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural reflecting areas

C359S456000, C359S457000, C359S460000

Reexamination Certificate

active

10524537

ABSTRACT:
A contrast improving sheet includes a first optical functional element and a second optical functional element on the viewing side thereof. The first optical functional element has a plurality of protrusions, each having a pair of opposite total-reflection facets for totally reflecting image light rays substantially perpendicularly incident on the entrance surface and a flat facet extending between the front edges, on the side of the exit surface, of the pair of opposite total-reflection facets. Light absorbing layers are formed between the adjacent protrusions. The second optical functional element has a light path correcting layer for correcting light paths followed by the image light rays totally reflected by the total-reflection facets such that the image light rays are emitted through the exit surface substantially perpendicularly to the exit surface. The light path correcting layer has a plurality of alternately inclined planes inclined in opposite directions.

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patent: 2003-66206 (2003-03-01), None
patent: 2003-177394 (2003-06-01), None
patent: 2004-086187 (2004-03-01), None

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