Enhanced LCD backlight

Details Enhanced LCD backlight Enhanced LCD backlight

2007-10-09

2007-10-09

O'Shea, Sandra (Department: 2875)

Illumination

Edge lighted panel

Light guide

C362S615000, C362S623000, C362S019000

Reexamination Certificate

active

11223660

ABSTRACT:
A light guide containing substantially aligned non-spherical particles provides more efficient control of light scattering. One or more regions containing ellipsoidal particles may be used and the particle sizes may vary between 2 and 100 microns in the smaller dimension. The light scattering regions may be substantially orthogonal in their axis of alignment. Alternatively, one or more asymmetrically scattering films can be used in combination with a backlight light guide and a reflector to produce an efficient backlight system. The light guides may be manufactured by embossing, stamping, or compression molding a light guide in a suitable light guide material containing asymmetric particles substantially aligned in one direction. The light scattering light guide or non-scattering light guide may be used with one or more light sources, collimating films or symmetric or asymmetric scattering films.

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Nitto DenkoPress Release, Nov. 11, 2003, 2 pages, http://www.nitto.com/company/release/03—11—11/index.html.
Okumura et al.J. Opt. A: Pure Appl. Opt., 5:S269-S275 (2003).
Patent Abstracts of Japan for JP 2001 159704, vol. 2000, No. 23 (2001).
International Search Report for PCT/US2005/031795, mailed Jan. 19, 2006.

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