Light emitting device with optical redundancy
First Claim
1. An optically redundant light emitting device comprising:
- a. a light transmitting film comprising a lightguide region defining a light emitting area and an array of coupling lightguides extending from the light emitting area wherein each coupling lightguide of the array of coupling lightguides is bent to form a stacked array of coupling lightguides;
b. a first group of light sources comprising at least two light sources positioned to emit light into end edges of the stacked array of coupling lightguides; and
c. a second group of light sources comprising at least one light source positioned to emit light into the end edges of the stacked array of coupling lightguides, the first group of light sources and the second group of light sources positioned in a linear array parallel to the end edges of the stacked array of coupling lightguides, wherein;
i) when the first group of light sources and the second group of light sources are emitting light, each coupling lightguide in the stacked array of coupling lightguides receives light emitted from the first group of light sources and light emitted from the second group of light sources, the light travels by total internal reflection through the light transmitting film to the light emitting area, the light emitted from the first group of light sources and the light emitted from the second group of light sources exit the light transmitting film in the light emitting area with a spatial luminance uniformity of the light emitting area along an edge of the lightguide region disposed to receive light from the array of coupling lightguides greater than 70%; and
ii) when the first group of light sources is emitting light and the second group of light sources is not emitting light, the light emitted from the first group of light sources exits the light transmitting film in the light emitting area with a spatial luminance uniformity of the light emitting area along the edge of the lightguide region disposed to receive light from the array of coupling lightguides greater than 70%.
2 Assignments
0 Petitions
Accused Products
Abstract
An optically redundant light emitting device includes a light transmitting film comprising an array of coupling lightguides extending from a light emitting area defined within the light transmitting film. Each coupling lightguide is bent to form a stacked array of coupling lightguides. A first group of light sources comprising at least one light source is positioned to emit light into the stacked array of coupling lightguides, and a second group of light sources comprising at least one light source is positioned to emit light into the stacked array of coupling lightguides. A first optical path of the light emitted from the first group of light sources overlaps with a second optical path of the light from the second group of light sources in each coupling lightguide.
-
Citations
21 Claims
-
1. An optically redundant light emitting device comprising:
-
a. a light transmitting film comprising a lightguide region defining a light emitting area and an array of coupling lightguides extending from the light emitting area wherein each coupling lightguide of the array of coupling lightguides is bent to form a stacked array of coupling lightguides; b. a first group of light sources comprising at least two light sources positioned to emit light into end edges of the stacked array of coupling lightguides; and c. a second group of light sources comprising at least one light source positioned to emit light into the end edges of the stacked array of coupling lightguides, the first group of light sources and the second group of light sources positioned in a linear array parallel to the end edges of the stacked array of coupling lightguides, wherein; i) when the first group of light sources and the second group of light sources are emitting light, each coupling lightguide in the stacked array of coupling lightguides receives light emitted from the first group of light sources and light emitted from the second group of light sources, the light travels by total internal reflection through the light transmitting film to the light emitting area, the light emitted from the first group of light sources and the light emitted from the second group of light sources exit the light transmitting film in the light emitting area with a spatial luminance uniformity of the light emitting area along an edge of the lightguide region disposed to receive light from the array of coupling lightguides greater than 70%; and ii) when the first group of light sources is emitting light and the second group of light sources is not emitting light, the light emitted from the first group of light sources exits the light transmitting film in the light emitting area with a spatial luminance uniformity of the light emitting area along the edge of the lightguide region disposed to receive light from the array of coupling lightguides greater than 70%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An optically redundant light emitting device comprising:
-
a light transmitting film comprising an array of coupling lightguides extending from a light emitting area defined within a lightguide region of the light transmitting film wherein each coupling lightguide of the array of coupling lightguides is bent to form a stacked array of coupling lightguides; a first group of light sources comprising at least two light sources positioned to emit white light into end edges of the stacked array of coupling lightguides; and a second group of light sources comprising at least two light sources positioned to emit white light into the end edges of the stacked array of coupling lightguides, the first group of light sources and the second group of light sources positioned in a linear array parallel to the end edges of the stacked array of coupling lightguides, wherein light from the first group of light sources and light from the second group of light sources propagates by total internal reflection through the light transmitting film and exits the light transmitting film in the light emitting area, the light from the first group of light sources has a spatial luminance uniformity of the light emitting area along an edge of the lightguide region disposed to receive light from the array of coupling lightguides greater than 70%, and the light from the second group of light sources has a spatial luminance uniformity of the light emitting area along an edge of the lightguide region disposed to receive light from the array of coupling lightguides greater than 70%. - View Dependent Claims (14, 15, 16)
-
-
17. A light emitting device comprising:
-
a light transmitting film comprising an array of coupling lightguides extending from a light emitting area defined within a lightguide region of the light transmitting film wherein each coupling lightguide of the array of coupling lightguides is bent to form a stacked array of coupling lightguides; and a first group of light sources comprising at least two light sources of a first color positioned to emit light into end edges of the stacked array of coupling lightguides; and a second group of light sources comprising at least two light sources of a second color different from the first color positioned to emit light into the end edges of the stacked array of coupling lightguides, the first group of light sources and the second group of light sources positioned in a linear array parallel to the end edges of the stacked array of coupling lightguides, wherein each coupling lightguide in the stacked array of coupling lightguides is positioned to receive light emitted from the first group of light sources and light emitted from the second group of light sources, and the light emitting area has a spatial color non-uniformity (Δ
u′
v′
) less than 0.2 along an edge of the lightguide region disposed to receive light from the array of coupling lightguides when the first group of light sources and the second group of light sources are emitting light and when only the first group of light sources is emitting light. - View Dependent Claims (18, 19, 20, 21)
-
Specification