Light emitting device including a film lightguide with a light mixing region and light emitting region
First Claim
1. A light emitting device comprising:
- a light source;
a film including a body having an inner surface and an opposing outer surface in a thickness direction of the film, the body of the film comprising a light emitting region defined by a plurality of light extracting features;
a light input region of the film configured to receive light emitted from the light source; and
a light mixing region of the film positioned along the film between the light input region and the light emitting region such that the light emitted from the light source propagates by total internal reflection from the light input region, through the light mixing region, and into the light emitting region in a total internal reflection condition, whereinthe light extracting features redirect a portion of the light out of the film in the light emitting region;
the light mixing region of the film comprises a first bend in a first plane comprising the thickness direction such that the first bend positions a portion of the light mixing region above or below the light emitting region in the thickness direction;
the first bend has a first bend angle of 180 degrees or greater than 180 degrees in the first plane; and
a ratio of a length of light mixing region to a length of the light emitting region is greater than 0.1 in the first plane.
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Accused Products
Abstract
In one aspect, a light emitting device comprises a light source, a film-based lightguide with a light emitting region. The film may have a light mixing region positioned between a light input region and the light emitting region. In one aspect a ratio of a length of the light mixing region to a length of the light emitting region is greater than 0.1 in a first plane comprising the thickness direction. In one aspect the light emitting device comprises a guide element having a surface curved in a first plane positioned adjacent the inner surface of the film, wherein the film is folded along the curved surface at a first fold such that the first fold positions a portion of the light mixing region above or below the active area of the display and the light mixing region comprises the first fold.
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Citations
21 Claims
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1. A light emitting device comprising:
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a light source; a film including a body having an inner surface and an opposing outer surface in a thickness direction of the film, the body of the film comprising a light emitting region defined by a plurality of light extracting features; a light input region of the film configured to receive light emitted from the light source; and a light mixing region of the film positioned along the film between the light input region and the light emitting region such that the light emitted from the light source propagates by total internal reflection from the light input region, through the light mixing region, and into the light emitting region in a total internal reflection condition, wherein the light extracting features redirect a portion of the light out of the film in the light emitting region; the light mixing region of the film comprises a first bend in a first plane comprising the thickness direction such that the first bend positions a portion of the light mixing region above or below the light emitting region in the thickness direction; the first bend has a first bend angle of 180 degrees or greater than 180 degrees in the first plane; and a ratio of a length of light mixing region to a length of the light emitting region is greater than 0.1 in the first plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A light emitting device comprising:
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a light source; a film including a body having an inner surface and an opposing outer surface in a thickness direction of the film, the body of the film comprising a light emitting region defined by a plurality of light extracting features; a light input region of the film configured to receive light emitted from the light source; a light mixing region of the film positioned along the film between the light input region and the light emitting region such that the light emitted from the light source propagates by total internal reflection from the light input region, through the light mixing region, and into the light emitting region in a total internal reflection condition, wherein the light extracting features redirect a portion of the light out of the film in the light emitting region; and a plurality of coupling lightguide strips extending from the light mixing region of the film, the coupling lightguides strips are folded and stacked such that ends of the folded and stacked coupling lightguide strips define the light input region, wherein the light mixing region of the film comprises a first bend in a first plane comprising the thickness direction of the film such that the first bend positions a portion of the light mixing region above or below the light emitting region in the thickness direction; the first bend has a first bend angle of 180 degrees or greater than 180 degrees in the first plane; and a ratio of a length of light mixing region to a length of the light emitting region is greater than 0.1 in the first plane. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of making a light emitting device comprising:
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a) forming a film including a body having an inner surface and an opposing outer surface in a thickness direction of the film, the body of the film comprising a light emitting region defined by a plurality of light extracting features and a light mixing region adjacent the light emitting region along the film, wherein a ratio of a length of light mixing region to a length of the light emitting region is greater than 0.1 in a first plane comprising the thickness direction of the film; b) positioning a light source to emit light into a light input region of the film such that the light emitted from the light source passes through the light mixing region of the film and into the light emitting region in a total internal reflection condition, wherein the light extracting features redirect a portion of the light out of the film in the light emitting region; d) positioning a guide element adjacent the light mixing region of the film such that a surface of the guide element curved in the first plane is adjacent the inner surface of the film; and e) bending the light mixing region of the film along the curved surface of the guide element forming a first bend in the film in the first plane such that the bending positions a portion of the light mixing region above or below the light emitting region in the thickness direction. - View Dependent Claims (20, 21)
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Specification