Light leveling means for fluorescent backlit displays or the lik

Details Light leveling means for fluorescent backlit displays or the lik Light leveling means for fluorescent backlit displays or the lik

1992-06-08

1994-01-25

Lazarus, Ira S.

Illumination

Elongated source light unit or support

With or including transparent or translucent member

362307, 362311, 362260, 362147, 362373, F21V 1304

Patent

active

052821170

ABSTRACT:
A method of providing uniform illumination of a light transmissive image on the light transmissive display panel of a fluorescent backlit display or the like, which includes blocking of a portion of the light flux projecting from at least one elongated tubular lamp toward the display panel in a plane including the lamp axis and normal to said panel; and blocking decreasing amounts of light flux projected from said lamp toward the display panel at points thereon spaced at successively greater distances on each side of said plane. A variable opacity light leveling mask configured to produce the aforementioned uniform illumination is interposed between the lamp and the display panel.

REFERENCES:
patent: 4267489 (1981-05-01), Morohashi
patent: 4335421 (1982-06-01), Modia et al.
patent: 4418378 (1983-11-01), Johnson
patent: 4691276 (1987-09-01), Giesberg
patent: 5038259 (1991-08-01), Katoh et al.

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