Illumination – Revolving
Patent
1998-04-21
2000-03-14
Sember, Thomas M.
Illumination
Revolving
362330, 362329, 362800, F21V 704
Patent
active
060363274
ABSTRACT:
The present invention provides a substantially planar illuminating device, a visual display having an internal light source and a method of manufacture therefor. The illuminating device includes a transparent substrate having a pair of substantially parallel major surfaces and an entry point for accepting light from the light source wherein the substrate functions as a guide for the light. The device also includes a plurality of microelements located on one of the pair of surfaces. The microelements have a substantially planar surface with an average roughness less than one micron and a side wall abnormal to the planar surface. In advantageous embodiments, the side wall is curved. The planar surface is configured to re-direct a substantial amount of light received in the substrate from an external light source out of the substrate. The side wall is configured to re-direct light from the internal light source out of the substrate.
REFERENCES:
patent: 3994564 (1976-11-01), Somogyi
patent: 4373282 (1983-02-01), Wragg
patent: 5390436 (1995-02-01), Ashall
patent: 5485291 (1996-01-01), Qiao et al.
patent: 5521796 (1996-05-01), Osakada et al.
patent: 5664862 (1997-09-01), Redmond et al.
Blonder Greg E.
Johnson Bertrand H.
Wong Yiu-Huen
Lucent Technologies - Inc.
Sember Thomas M.
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