Backlighting device and color display device

Details Backlighting device and color display device Backlighting device and color display device

1998-11-19

1999-10-05

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

344 64, 344 86, 362 27, G02F 11335

Patent

active

059632801

ABSTRACT:
To achieve a backlighting device having excellent light utilization, there is provided an edge lighting-type backlight having a light guiding member, a high-refractive-index layer formed thereon and having a higher refractive index than the light guiding member, and a scattering layer formed on the high-refractive-index layer. Light from a light source disposed facing the edge of the light guiding member enters the high-refractive-index layer through the light guiding member, and effectively scatters scatterers to produce high brightness, and furthermore, to achieve a color display device that eliminates color. mixing in a transparent display device for decorative or various display uses, a construction is provided in which on one surface of a light guiding plate there are formed a high-refractive-index layer having a higher refractive index than the light guiding plate, a light scattering layer, and a low-refractive-index layer having a lower refractive index than the light guiding plate, one on top of another in this order, and on top of that structure another light guiding plate is provided, on top of which a high-refractive-index layer and a light scattering layer are likewise formed, while a color filter is disposed on one edge face of each light guiding plate and a light source is disposed near each color filter.

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Optics, Second Edition, p. 300, Addison-Wesley Publishing Company.
"Backlighting Technology for Liquid Crystal Panel", pp. 23-41 (w/partial English translation).
European Search Report corresponding to application No. EP 96 11 9458 dated Feb. 19, 1998.
Y. Mesaki et al., "19.1: Invited Address: New Backlighting Technologies for LCDs", SID 94 Digest, pp. 281-284, Jun. 14, 1994.
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