LIGHT EXTRACTION FILM SYSTEM
First Claim
1. A backlight comprising in order a lightguide plate with a sidelit light source and bonded thereto a light extraction unit containing, in order from the lightguide plate, a first polymeric layer, an adhesive layer, a second polymeric layer bearing features at least partly embedded in the adhesive layer, wherein the materials of the first polymeric layer, the adhesive layer, and the second polymeric layer differ by less than 0.05 in refractive index, and the interstitial regions between the non-embedded portions of the features containing a material having a refractive index at least 0.1 lower than that of the material comprising the features.
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Accused Products
Abstract
A backlight comprises in order a lightguide plate with a sidelit light source and bonded thereto a light extraction unit containing in order from the lightguide plate, a first polymeric layer, an adhesive layer, a second polymeric layer bearing features at least partly embedded in the adhesive layer wherein the materials of the first polymeric layer, the adhesive layer, and the second polymeric layer differ by less than 0.05 in refractive index, the interstitial regions between the non-embedded portions of the features containing a material having a refractive index at least 0.1 lower than that of the material comprising the features.
61 Citations
28 Claims
- 1. A backlight comprising in order a lightguide plate with a sidelit light source and bonded thereto a light extraction unit containing, in order from the lightguide plate, a first polymeric layer, an adhesive layer, a second polymeric layer bearing features at least partly embedded in the adhesive layer, wherein the materials of the first polymeric layer, the adhesive layer, and the second polymeric layer differ by less than 0.05 in refractive index, and the interstitial regions between the non-embedded portions of the features containing a material having a refractive index at least 0.1 lower than that of the material comprising the features.
- 4. A display comprising a backlight comprising in order a lightguide plate with a sidelit light source and bonded thereto a light extraction unit containing, in order from the lightguide plate, a first polymeric layer, an adhesive layer, a second polymeric layer bearing features only partly embedded in the adhesive layer wherein the materials of the first polymeric layer, the adhesive layer, and the second polymeric layer differ by less than 0.05 in refractive index, the interstitial regions between the non-embedded portions of the features containing a material having a refractive index at least 0.1 lower than that of the material of the features.
- 11. A light extraction unit comprising in order, a first polymeric layer, an adhesive layer, a second polymeric layer bearing light extracting features only partly embedded in the adhesive layer wherein the materials of the first polymeric layer, the adhesive layer, and the second polymeric layer differ by less than 0.05 in refractive index, the interstitial regions between the non-embedded portions of the features containing a material having a refractive index at least 0.1 lower than that of the material of the features.
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15. A process for forming an illumination apparatus comprising
(a) applying an adhesive to a first polymeric layer; -
(b) providing a second polymeric layer bearing features having an input surface that comprises a plurality of light extracting features separated by regions of lower refractive index (c) forming an embedded light extraction unit by partly embedding at least a portion of the said light extracting features into the said adhesive (d) bonding the non-adhesive side of the first polymeric layer to the output side of a light guide plate. - View Dependent Claims (18, 20, 23, 24, 25, 26)
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16. A process for forming an illumination apparatus comprising:
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(a) applying a bonding material to a light guide for accepting light from at least one light source; (b) coating of an adhesive on the surface of a first polymeric film; (c) providing a light extracting second polymeric film having an input surface that comprises a plurality of light extracting features separated by regions of index of refraction lower than that of the features; (d) embedding at least a portion of the light extracting features of the light extracting second polymeric film of step (c) in the adhesive of step (b); (e) affixing the bonding material of step (a) to the non-adhesive side of the first polymeric film of step (b). - View Dependent Claims (17, 19, 21, 22, 27)
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28. A display comprising an illumination apparatus comprising in order a light guide plate, a bonding interface, a light extraction film unit.
Specification