Optical: systems and elements – Projection screen – With reflector or additional screen
Reexamination Certificate
2006-10-17
2006-10-17
Perkey, W.B. (Department: 2851)
Optical: systems and elements
Projection screen
With reflector or additional screen
C359S454000, C359S459000, C359S506000, C359S492010, C359S452000, C359S599000, C359S487030, C349S185000, C349S087000, C349S096000, C349S176000, C349S115000
Reexamination Certificate
active
07123409
ABSTRACT:
The present invention provides a projection screen capable of sharply displaying an image by minimizing the influence of the loss of light that occurs on a polarized-light selective reflection layer and of providing high image visibility. A projection screen includes: a polarized-light selective reflection layer that selectively reflects a specific polarized-light component; and a substrate that supports the polarized-light selective reflection layer. The polarized-light selective reflection layer includes a plurality of partial selective reflection layers that are laminated to one another, and the partial selective reflection layers have cholesteric liquid crystalline structures, owing to which they selectively reflect a specific polarized-light component. The cholesteric liquid crystalline structure of each partial selective reflection layer comprises a plurality of helical structure parts that are different in direction of helical axis, and, owing to structural non-uniformity in the cholesteric liquid crystalline structure, diffuses light (imaging light) that is selectively reflected. The partial selective reflection layer (11a) is for selectively reflecting light in the green (G) color wave range, the partial selective reflection layer (11b) is for selectively reflecting light in the blue (B) color wave range, and the partial selective reflection layer (11c) is for selectively reflecting light in the red (R) color wave range. These partial selective reflection layers (11a,11band11c) are successively laminated in this order from the substrate side.
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Cruz Magda
Dai Nippon Printing Co. Ltd.
Perkey W.B.
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