Projection type liquid-crystal video display device using a fres

Details Projection type liquid-crystal video display device using a fres Projection type liquid-crystal video display device using a fres

1986-07-18

1990-06-26

Miller, Stanley D.

Optics: image projectors

Plural projection paths with single light source

350345, 350452, 353102, 353122, G02F 113, G02F 1126

Patent

active

049366572

ABSTRACT:
A projection-type liquid-crystal display in which a Fresnel lens in placed on the exit side of the liquid crystal panel to focus the image toward a projection lens. Preferably, the Fresnel lens has a non-symmetric pattern so as to efficiently gather light propagating through the display panel at an oblique angle coinciding with a reorientation angle of the liquid crystal. Additional optics on the incident side of the panel, perhaps including another non-symmetric Fresnel lens, collimates the light at the oblique angle.

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