Light source for planar illumination in liquid crystal device

Details Light source for planar illumination in liquid crystal device Light source for planar illumination in liquid crystal device

1989-06-30

1991-11-12

Hille, Rolf

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

362 31, 362347, G02F 113, F21V 704

Patent

active

050642766

ABSTRACT:
A light source device disposing light sources at both end faces of the transparent plate in which a surface of the transparent plate in the side of an observer (front surface) is formed as the inclined and curved surface in view of limiting reduction in quantity of light per unit area at the observing area being far from the light source within a certain level, the one surface of the transparent plate is formed as the rough surface to diffuse the incident light, the other surface of the transparent plate is formed as a mirror-surface, and a reflecting layer having a high lightness is disposed at the lower side of the transparent plate in order to provide sufficient luminance for observers.

REFERENCES:
patent: 4630895 (1986-12-01), Abdala et al.
patent: 4909604 (1990-03-01), Kobayashi et al.

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