Light guide plate with nano-particle layer and back light...

Details Light guide plate with nano-particle layer and back light... Light guide plate with nano-particle layer and back light...

2007-01-09

2007-01-09

Husar, Stephen F (Department: 2875)

Illumination

Edge lighted panel

Light guide

C362S026000, C362S617000, C349S065000, C385S901000

Reexamination Certificate

active

10951846

ABSTRACT:
A back light system (2) includes a light guide plate (50). The light guide plate includes an array of prisms (55) formed thereon, and a nano-particle layer (80) formed on the prisms for diffusing light beams propagating therethrough. The nano-particle layer contains a mass of transparent nano-particles with diameters preferably in the range from 30˜100 nm. A material of the particles may be TiO2(titanium oxide), SiO2(silicon dioxide), or Al2O3(aluminum oxide). Each light beam passing through the nano-particle layer is scattered, and most of the scattering occurs over a limited range of angles. The scattered light beams exit the nano-particle layer mostly over the limited range of angles, with a medial direction of propagation in the range of angles being substantially parallel to a viewing direction. The back light system can yield high brightness and uniform luminescence, and is relatively simple in construction and inexpensive.

REFERENCES:
patent: 5779337 (1998-07-01), Saito et al.
patent: 6231200 (2001-05-01), Shinohara et al.
patent: 6356391 (2002-03-01), Gardiner et al.
patent: 6844950 (2005-01-01), Ja Chisholm et al.
patent: 2004/0228141 (2004-11-01), Hay et al.
patent: 2005/0059766 (2005-03-01), Jones et al.

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