Light adjusting sheet having a sinusoidal surface and a non-opti

Details Light adjusting sheet having a sinusoidal surface and a non-opti Light adjusting sheet having a sinusoidal surface and a non-opti

1994-09-08

1996-09-03

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 69, 362 31, G02F 11335, F21V 704

Patent

active

055529070

ABSTRACT:
A light adjusting sheet for a planar lighting device includes a plurality of convex and concave streaks arranged alternately and approximately parallel to each other on one surface. The streaks may have a cross section of a sine curve. Another light adjusting sheet consists of a plurality of single sheets each having the above configulation, stacked together. A planar lighting device includes the light adjusting sheet of the above configulation, wherein peak lines of the convex streaks and bottom lines of the concave streaks are arranged to make a predetermined angle with an axis of a linear light source. The liquid crystal display includes a liquid crystal display element placed on front of the planar lighting device of the above configulation.

REFERENCES:
patent: 5005108 (1991-04-01), Pristash et al.
patent: 5394255 (1995-02-01), Yokota et al.
patent: 5414599 (1995-05-01), Kaneko et al.
"Backlighting for Liquid Crystal Display", IBM Technical Disclosure Bulletin, vol. 29, No. 11, Apr. 1987, pp. 4838-4839.

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