Optical sheet, backlight unit and liquid crystal display device having the same
First Claim
Patent Images
1. An optical sheet disposed above a light guide plate, the optical sheet comprising:
- a first layer having a larger refractivity than air;
a second layer having a larger refractivity than the first layer;
a refractive pattern disposed at a boundary surface between the first layer and the second layer, the refractive pattern having one or more ridges that change a traveling path of light;
a third layer having a lower refractivity than the first layer; and
a diffusion layer that diffuses light on the second layer,wherein the third layer is disposed at the lower surface of the first layer and facing the light guide plate,wherein the upper surface and the lower surface of the third layer is formed in a plate shape,wherein the optical sheet is operable to refract light from the light guide at least three times in a direction of the upper area of the optical sheet to a light-exiting surface,wherein the diffusion layer includes a plurality of beads,wherein the optical sheet includes the first, second and third layers for condensing light and the diffusion layer for diffusing light,wherein a boundary surface between the first layer and the third layer is not formed as a refractive pattern, andwherein the lower surface of the third layer is not formed as a refractive pattern.
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Abstract
Provided are an optical sheet, a backlight unit and an LCD device having the same. The backlight unit includes a first layer, a second layer, and a refractive pattern. The first layer has a larger refractivity than an air layer, and the second layer has a larger refractivity than the first layer. The refractive pattern is disposed at a boundary surface between the first layer and the second layer and has ridges and furrows that change a traveling path of light. The optical sheet refracts light at least three times to condense the light in a direction perpendicular to a light-exiting surface.
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Citations
17 Claims
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1. An optical sheet disposed above a light guide plate, the optical sheet comprising:
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a first layer having a larger refractivity than air; a second layer having a larger refractivity than the first layer; a refractive pattern disposed at a boundary surface between the first layer and the second layer, the refractive pattern having one or more ridges that change a traveling path of light; a third layer having a lower refractivity than the first layer; and a diffusion layer that diffuses light on the second layer, wherein the third layer is disposed at the lower surface of the first layer and facing the light guide plate, wherein the upper surface and the lower surface of the third layer is formed in a plate shape, wherein the optical sheet is operable to refract light from the light guide at least three times in a direction of the upper area of the optical sheet to a light-exiting surface, wherein the diffusion layer includes a plurality of beads, wherein the optical sheet includes the first, second and third layers for condensing light and the diffusion layer for diffusing light, wherein a boundary surface between the first layer and the third layer is not formed as a refractive pattern, and wherein the lower surface of the third layer is not formed as a refractive pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A backlight unit comprising:
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a light source emitting light; and an optical sheet disposed above a light guide plate, the optical sheet comprising; a first layer having a larger refractivity than air; a second layer having a larger refractivity than the first layer; and a refractive pattern disposed at a boundary surface between the first layer and the second layer, the refractive pattern having one or more ridges that change a traveling path of light; a third layer having a lower refractivity than the first layer; and a diffusion layer that diffuses light on the second layer, wherein the third layer is disposed at the lower surface of the first layer and facing the light guide plate, wherein the upper surface and the lower surface of the third layer is formed in a plate shape, wherein the optical sheet is operable to refract light from the light guide at least three times in a direction of the upper area of the optical sheet to a light-exiting surface, wherein the diffusion layer includes a plurality of beads, wherein the optical sheet includes the first, second and third layers for condensing light and the diffusion layer for diffusing light, wherein a boundary surface between the first layer and the third layer is not formed as a refractive pattern, and wherein the lower surface of the third layer is not formed as a refractive pattern. - View Dependent Claims (9, 10, 11, 12)
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13. A liquid crystal display (LCD) device comprising:
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a light source emitting light; an optical sheet disposed above a light guide plate; and a LCD panel displaying an image using light received from the optical sheet, wherein the optical sheet comprises; a first layer having a larger refractivity than air; a second layer having a larger refractivity than the first layer; and a refractive pattern disposed at a boundary surface between the first layer and the second layer, the refractive pattern having one or more ridges that change a traveling path of light; a third layer having a lower refractivity than the first layer; and a diffusion layer that diffuses light on the second layer, wherein the third layer is disposed at the lower surface of the first layer and facing the light guide plate, wherein the upper surface and the lower surface of the third layer is formed in a plate shape, wherein the optical sheet is operable to refract light from the light guide at least three times in a direction of the upper area of the optical sheet to a light-exiting surface, wherein the diffusion layer includes a plurality of beads, wherein the optical sheet includes the first, second and third layers for condensing light and the diffusion layer for diffusing light, wherein a boundary surface between the first layer and the third layer is not formed as a refractive pattern, and wherein the lower surface of the third layer is not formed as a refractive pattern. - View Dependent Claims (14, 15, 16, 17)
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Specification