Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Patent
1995-12-18
1998-12-22
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
349 64, 349 61, 349 65, 362293, 362 31, G02F 11335
Patent
active
058524835
ABSTRACT:
An improved illuminated LCD apparatus of the type comprising a PCB (7;10) upon which are mounted a liquid crystal display (1), at least one light source (3), a light guide (2) disposed between the liquid crystal display and the substrate for distributing light from the light source over an area of the liquid crystal display, and light attenuating means (5;18,20) disposed between the light guide and the substrate and comprising a pattern of areas of differing optical reflectance for reducing the intensity of the light reaching portions of the liquid crystal display nearest to the light source. The improvement comprises the light attenuating pattern being printed directly onto the substrate, thereby improving the efficiency and accuracy with which the pattern is applied. The light attenuating pattern may include elements formed as part of the usual PCB production process.
REFERENCES:
patent: 4673254 (1987-06-01), Kato et al.
patent: 5016002 (1991-05-01), Levanto
patent: 5134549 (1992-07-01), Yokoyam
patent: 5384658 (1995-01-01), Ohtake et al.
patent: 5600462 (1997-02-01), Suzuki et al.
Newstead Robert Clifford
Peregrine Peter Michael
Ngo Julie
Nokia Mobile Phones Ltd.
Sikes William L.
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