Projection display apparatus

Details Projection display apparatus Projection display apparatus

1989-02-23

1990-07-24

Haroian, Harry N.

Optics: image projectors

Composite projected image

Multicolor picture

358 60, 350174, 353 34, G03B 2100

Patent

active

049431544

ABSTRACT:
A projection display apparatus has a light source, a component color separator, a light transmitter(s), three light valves, a light combiner, a single projection lens, and a drive circuit. The light transmitter includes an input side convergent lens for producing a real image of a luminous element in the light source at a location adjacent to a central convergent lens. The central convergent lens produces a real image of an object situated about a position of the input side convergent lens at a location adjacent to an output side convergent lens. The output side convergent lens permits its output light to reach the projection lens. Accordingly, divergent light is converged along a considerably extending portion of the optical path and directed to the projection lens so that the efficiency of light in use can be improved, thus allowing the projection display apparatus to remain compact in size and provide a great light output power.

REFERENCES:
patent: 2642487 (1947-02-01), Schroeder
patent: 2958258 (1960-11-01), Kelly
Morozumi et al., LCD Full Color Video Projects, SID Digest 1986, p. 375.
Ledebuhr, Full Color Single-Projection Lens, etc., SID Digest 1986, p. 379.
Aruga et al., High Resolution Full Color Video Projector, etc., SID Digest 1987, p. 75.

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