Light panel with enlarged viewing window

Details Light panel with enlarged viewing window Light panel with enlarged viewing window

Filed on

2006-01-24

Date issued

2006-01-24

Examiner

Tso, Laura K. (Department: 2875)

Patent Class

Illumination

SubClass

Revolving

Other Related Categories

C362S555000

Type

Reexamination Certificate

Status

active

Patent number

06988813

Description

ABSTRACT:
The invention relates to a light panel (12), comprising: a light guide having a front surface defining a viewing window (11), a back surface and sides (3, 4) between the front and back surfaces; and a patterned array of light sources (8, 9, 10) of at least two types, which types are distinguished by the color of light emitted by the light sources of said at least two types, said array being arranged along at least one of the sides. Each light source generates in use a divergent light beam of a color into the panel to, in combination, color the panel. Further, the array comprises complementary sub-arrays (8, 9, 8, 9&9, 10, 9, 10) of light sources along at least two of the sides. Since the sub-arrays are complementary, in that by all light sources of the different types the same amount of light is emitted into the light guide as in prior art single array configurations (the same number of light sources), but from two or more sides while maintaining the general light source pitch, the average distance or pitch between light sources of one of the types, can be decreased. Therewith also the required distance or colors for color mixing is lessened and the viewing window is enlarged.

REFERENCES:
patent: 5365411 (1994-11-01), Rycroft et al.
patent: 6447133 (2002-09-01), Eschke et al.
patent: 6530670 (2003-03-01), Hirayama

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