Optical relay lens system for projection displays

Details Optical relay lens system for projection displays Optical relay lens system for projection displays

1995-01-17

1997-01-28

Dowling, William

Optics: image projectors

Composite projected image

Multicolor picture

353 31, 349 5, G03B 2114

Patent

active

055972225

ABSTRACT:
A projection display which includes reflective light valves such as liquid crystal spatial light modulators, and a 1.times. optical relay lens system. The 1.times. optical relay lens system eliminates the requirement for a projection lens having a large retrofocus distance. Projection displays based upon reflective liquid crystal light valves (spatial light modulators) require dichroic beam splitters necessary for color separation and a polarizing beam splitter necessary for light valve operation positioned between the light valves and the projection lens. The 1.times. optical relay lens produces a relayed intermediate image of the light valves, and incorporates therein the dichroic beam splitters and the polarizing beam splitter. The 1.times. optical relay lens produces an intermediate image which is projected by the projection lens at a given magnification with minimal working distance, which results in relatively less residual lateral color and an inexpensive projection lens.

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