Background lighting apparatus for liquid crystal display

Details Background lighting apparatus for liquid crystal display Background lighting apparatus for liquid crystal display

1990-05-18

1992-07-14

Cole, Richard R.

Illumination

Revolving

362236, F21V 800

Patent

active

051308983

ABSTRACT:
A background lighting apparatus comprises a light source arranged adjacent to a light entering end face or surface of a transparent plate and having an irregular reflecting surface or portion on at least one side thereof and wherein the irregular reflecting surface or portion comprises a plurality of milky white type fine lines. The width of the fine lines of uniform pitch monotonically increases across the transparent plate from the light source or the pitch between fine lines of uniform width monotonically decreases across the transparent plate from the light source or the width of the fine lines and the pitch between the lines monotonically increase and monotonically decrease, respectively, across the transparent plate in a direction from the light source.

REFERENCES:
patent: 3892959 (1975-07-01), Pulles
patent: 3968584 (1976-07-01), Kingston
patent: 4568179 (1986-02-01), Durbin et al.
patent: 4729068 (1988-03-01), Ohe
patent: 4811507 (1989-03-01), Blanchet
patent: 4933814 (1990-06-01), Sanai
Electronic Design Aug. 2, 1961, p. 47.

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