Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Polarizer or special ray transmission
Patent
1998-07-01
2000-09-12
Patel, Ashok
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Polarizer or special ray transmission
313479, 362293, 359885, H01J 516
Patent
active
061182109
ABSTRACT:
A light-emitting display panel comprising an opaque background having a front face of dark color fitted with a plurality of light-emitting elements, the front face and the light-emitting elements being covered by a front optical filter. The front optical filter is a substantially neutral absorbant filter having a transmission coefficient lying in the range 10% to 60% over substantially the entire visible light spectrum, the display panel not having any other optical filter interposed between the background and the front optical filter.
REFERENCES:
patent: 3736050 (1973-05-01), Bolum
patent: 4142126 (1979-02-01), DuBois
patent: 5023763 (1991-06-01), Le Gars
Patel Ashok
Societe d'Exploitation du Mobilier a Usage Public
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