Projection type display

Details Projection type display Projection type display

1996-11-05

1998-08-04

Dowling, William

Optics: image projectors

Light shield, mask, hood, or diaphragm

353 30, 349 5, 349 74, G03B 2114

Patent

active

057883548

ABSTRACT:
A projection type display in which contrast of projected picture is improved without negatively affecting luminance of a projected picture. The projection type display comprises a main light bulb 3 wherein an illumination light flux 2 from a light source 1 is transmitted or scattered according to a display picture image formed by a control signal from a control circuit 9, and an auxiliary light bulb 17 wherein the illumination light flux 2 transmitted or scattered by the main light bulb 3 is transmitted or scattered according to the control signal from the control circuit 9. The light flux having transmitted through the auxiliary light bulb 17 is enlargedly projected by a projecting lens 7 via a diaphragm 6 condensed by a condensing lens 4, and is subjected to image-formation on a screen 8.

REFERENCES:
patent: 5379083 (1995-01-01), Tomita
patent: 5579136 (1996-11-01), Fukui et al.
patent: 5597223 (1997-01-01), Watanabe
patent: 5622418 (1997-04-01), Daijogo et al.

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