LAMINATED BACKLIGHT UNIT
First Claim
Patent Images
1. A backlight unit comprising:
- a light guide layer having a front face and a rear face, the light guide layer comprising a plurality of extraction features disposed along the rear face of the light guide layer;
a first cladding layer adhesively secured to the rear face of the light guide layer;
a plurality of turning structures disposed along the first cladding layer; and
a second cladding layer adhesively secured to the front face of the light guide layer;
wherein the first cladding layer has a first refractive index lower than a guide refractive index of the light guide layer, andwherein the second cladding layer has a second refractive index lower than or equal to the first refractive index.
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Abstract
A backlight unit includes a light guide layer including a plurality of extraction features disposed along a rear face of the light guide layer, a first cladding layer adhesively secured to the rear face of the light guide layer, a plurality of turning structures disposed along the first cladding layer, and a second cladding layer adhesively secured to a front face of the light guide layer. The first cladding layer has a first refractive index lower than a guide refractive index of the light guide layer. The second cladding layer has a second refractive index lower than or equal to the first refractive index.
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Citations
20 Claims
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1. A backlight unit comprising:
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a light guide layer having a front face and a rear face, the light guide layer comprising a plurality of extraction features disposed along the rear face of the light guide layer; a first cladding layer adhesively secured to the rear face of the light guide layer; a plurality of turning structures disposed along the first cladding layer; and a second cladding layer adhesively secured to the front face of the light guide layer; wherein the first cladding layer has a first refractive index lower than a guide refractive index of the light guide layer, and wherein the second cladding layer has a second refractive index lower than or equal to the first refractive index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A display comprising:
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a liquid crystal panel; and a laminated backlight unit adhesively secured to the liquid crystal panel, the laminated backlight unit comprising; a light guide layer comprising a plurality of extraction features disposed along a rear face of the light guide layer, each extraction feature being configured to cause light propagating through the light guide layer at a propagation angle within a predetermined range of angles to be extracted; a first cladding layer adhered to the rear face of the light guide layer; a plurality of turning structures disposed along the first cladding layer, the plurality of turning structures being configured to redirect the extracted light in a direction that corresponds with the propagation angle; and a second cladding layer adhered to a front face of the light guide layer; wherein the first cladding layer has a first refractive index lower than a guide refractive index of the light guide layer, and wherein the second cladding layer has a second refractive index lower than the first refractive index. - View Dependent Claims (15, 16, 17)
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18. A backlight unit comprising:
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a light guide layer into which light is injected, the light guide layer comprising a plurality of indentations, each indentation being disposed along a rear face of the light guide layer, each indentation being configured to cause the light to be extracted from the light guide layer as a result of the light encountering a respective one of the plurality of indentations, each indentation having a face oriented at an angle relative to the rear face; a first cladding layer comprising a first adhesive material, the first cladding layer being secured to the rear face of the light guide layer via the first adhesive material, the first adhesive material having a first refractive index lower than a guide refractive index of the light guide layer, each indentation being filled with the first adhesive material; a plurality of turning structures disposed along the first cladding layer; and a second cladding layer comprising a second adhesive material, the second cladding layer being secured to a front face of the light guide layer via the second adhesive material, the second adhesive material having a second refractive index lower than the first refractive index; wherein the first and second refractive indices are offset from the guide refractive index such that the front face has a total internal reflection angle greater than a total internal reflection angle of the rear face by at least twice the angle of the face of each extraction feature. - View Dependent Claims (19, 20)
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Specification