Image display apparatus, image display system, and...

Details Image display apparatus, image display system, and... Image display apparatus, image display system, and...

2006-05-09

2006-05-09

Dowling, William C. (Department: 2851)

Optics: image projectors

Unitary plural refracting surfaces

C353S101000, C362S309000

Reexamination Certificate

active

07040761

ABSTRACT:
Conventionally, concentrated illumination of a central portion of an image (about 40-60% of the whole image) in which information such as letters and a picture tends to concentrate (centrally concentrated illumination) and uniform illumination of the whole image (uniform illumination) can be carried out by using two separate apparatuses, but no single conventional image display apparatus can carry out both of the two types of illumination. Accordingly, an object of the present invention is to provide a liquid crystal display apparatus which can carry out centrally concentrated illumination, uniform illumination, and various other illumination states (illumination distributions). According to the present invention, an image display apparatus (such as a liquid crystal projector) is structured such that a fly-eye lens or a part thereof in an illumination optical system for illuminating an image forming element is moved to vary the illumination distribution on the image forming element.

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patent: 9-54279 (1997-02-01), None

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