Optical unit, light processing unit, light processing...

Details Optical unit, light processing unit, light processing... Optical unit, light processing unit, light processing...

2011-03-08

2011-03-08

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Color filter

C353S030000, C353S031000, C353S033000, C353S038000, C353S081000, C353S119000, C353S122000, C348S268000, C348S270000, C348S742000, C348S744000, C348S771000, C359S015000, C359S022000, C359S227000, C359S237000, C359S196100, C359S197100, C359S198100, C362S227000, C362S231000, C362S551000, C362S553000, C362S555000

Reexamination Certificate

active

07901086

ABSTRACT:
For displaying a color image by recombination of several single color images, parasitic noise like speckles due to scattering within the system, in particular when laser light is involved, with the invention a significant improvement with a low number of parts can be realized by use of a color wheel that comprises in radially divided zones refractive elements for redirecting light beams incoming at different impinging angles and redistributing elements, e.g. a hologram, that provide for a defined output beam in an optical axis. The sequence of the individual light processing zones on the color wheel are synchronized with respective laser sources. The invention combines the functionality of plural elements, reduces speckles and avoids losses.

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Jahja I. Trisnadi, “Speckle contrast reduction in laser projection displays”, Proceedings of SPIE, vol. 4657, XP-002329078, 2002, pp. 131-137.

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