Optical filter employing holographic optical elements and...

Details Optical filter employing holographic optical elements and... Optical filter employing holographic optical elements and...

2005-05-17

2005-05-17

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S022000, C353S031000, C349S202000

Reexamination Certificate

active

06894814

ABSTRACT:
The present invention relates to a solid state filter used in sequentially illuminating an image display, directly or indirectly, with first, second, and third bandwidth light. The solid state filter includes at least one hologram that is switchable between active and inactive states. While in the active state, the at least one switchable hologram diffracts a first bandwidth light. In contrast, the switchable hologram transmits the first bandwidth light without substantial alteration when operating in the inactive state. In one embodiment, the diffracted first bandwidth light is used to illuminate a monochrome image presented on a display device. In another embodiment, the transmitted first bandwidth light is used to illuminate the monochrome image presented on the image display.

REFERENCES:
patent: 6072923 (2000-06-01), Stone
patent: 6166880 (2000-12-01), Kobayashi et al.
patent: 6687030 (2004-02-01), Popovich et al.

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