Lightguide comprising a low refractive index region

Details Lightguide comprising a low refractive index region Lightguide comprising a low refractive index region

2010-05-07

2011-10-11

Sember, Thomas (Department: 2885)

Illumination

Edge lighted panel

Light modifier with emission face combined with light guide...

C362S617000, C362S623000, C362S307000

Reexamination Certificate

active

08033706

ABSTRACT:
In one embodiment of this invention, a lightguide comprises a low refractive index region disposed between light extracting region and a non-scattering region. In further embodiment of this invention, volumetric scattering lightguide comprises a low refractive index region disposed between a volumetric scattering region and a non-scattering region. In some embodiments, a light emitting device comprising a volumetric scattering lightguide can angularly filter light input into the edge of a volumetric scattering lightguide by controlling the refractive index of the low refractive index region relative to the refractive index of the non-scattering region to prevent direct illumination of the volumetric scattering region, provide a luminance uniformity greater than 70%, or improve the angular luminous intensity of the light emitting device. The volumetric scattering lightguide may be curved, tapered, and a light emitting device comprising the same may further comprise at least one light source and a light redirecting element.

REFERENCES:
patent: 5237641 (1993-08-01), Jacobson
patent: 5594830 (1997-01-01), Winston
patent: 6746130 (2004-06-01), Ohkawa
patent: 7004610 (2006-02-01), Yamashita et al.
patent: 2002/0141194 (2002-10-01), Wortman et al.
patent: 2004/0022050 (2004-02-01), Yamashita et al.
patent: 1329664 (2003-07-01), None

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