Projection type display apparatus

Details Projection type display apparatus Projection type display apparatus

2006-07-04

2006-07-04

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S033000, C353S034000, C353S037000, C353S099000, C359S634000

Reexamination Certificate

active

07070282

ABSTRACT:
A projection type display apparatus includes a color separation optical system separating light emitted from a light source into first, second and third color light; reflection type light valves provided each in correspondence to one of the first through third color light; polarization beam splitters provided each in correspondence to one of the first through third color light, which executes polarization separation causing the first through third color light to enter the reflection type light valves, and analyzing light exiting from the reflection type light valves after being modulated; a color composition optical system having a first, a second and a third prism, wherein the analyzed first through third color light undergo color composition; and a projection lens projecting the resulting light from the color composition, and lengths of optical paths wherein each of the first through third color light travels are equal to one another.

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