Liquid crystal display apparatus providing improved illumination

Details Liquid crystal display apparatus providing improved illumination Liquid crystal display apparatus providing improved illumination

1990-11-29

1992-09-29

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 41, G02F 11335

Patent

active

051518015

ABSTRACT:
Illuminating light from a light source is reflected by a reflector and collimated by a condenser lens and then applied onto the back of a liquid crystal cell. The liquid crystall cell has attached on its light source side an optical sheet which consists of a large number of optical elements such as convex or concave lenses aligned with picture elements or pixels of the liquid crystal cell. The optical elements each converge the rays of light from the light source onto each of the pixels, so that the rays that would otherwise strike a matrix circuit section and a black matrix layer will be focused on and passed through the pixels. This enhances the brightness of an image formed on the front of the liquid crystal cell and also prevents temperature rise in the liquid crystal cell because the black matrix layer and the matrix circuit section, components of the liquid crystal cell, are not struck and heated by the incoming light rays.

REFERENCES:
patent: 4126382 (1978-11-01), Barzilai et al.
patent: 4790632 (1988-12-01), Miyakawa et al.
patent: 4836652 (1989-06-01), Oishi et al.
patent: 4945348 (1990-07-01), Ibamoto et al.
M. Brandon, "Display Device", IBM Technical Disclosure Bulletin, vol. 19, No. 2, Jul. 1976, p. 691.

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