Optical sheet, and backlight unit and display using the same
First Claim
1. An optical sheet which is used for light control illumination in a backlight unit for a display, comprising:
- light reflection parts at non-light condensing areas by the lens unit; and
light transmission parts at areas other than the light reflection parts, respectively on a surface of a lenticular sheet having a lens unit which is formed by forming a convex cylindrical lens group in parallel, and a surface at a side opposite to the lens unit,wherein among a distance TB from a valley portion of concavity and convexity structuring the lens unit to the surface at the opposite side, a width A of the light transmission parts, a pitch P between the parallel convex cylindrical lenses, and a critical angle α
at an interface with the lenticular sheet at the light transmission parts,a relation of P≦
A+2*TB*tanα
is formed.
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Accused Products
Abstract
In an optical sheet which is used for light control illumination in a backlight unit for a display, in order from an incident side of an illuminating light, there are provided at least a light scattering layer which scatters the illuminating light toward an outgoing surface side, an adhesion layer or an adhesive layer, a light reflection layer which reflects light scattered by the light scattering layer toward the light scattering layer side, and a lens sheet whose flat rear face is fixed to the other side of the light reflection layer, and in which a plurality of unit lenses are disposed on the surface. Opening portions corresponding to the respective unit lenses one-to-one are provided to the light reflection layer, and thickness of the adhesion layer or the adhesive layer is thinner than that of the light reflection layer.
53 Citations
20 Claims
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1. An optical sheet which is used for light control illumination in a backlight unit for a display, comprising:
-
light reflection parts at non-light condensing areas by the lens unit; and
light transmission parts at areas other than the light reflection parts, respectively on a surface of a lenticular sheet having a lens unit which is formed by forming a convex cylindrical lens group in parallel, and a surface at a side opposite to the lens unit,wherein among a distance TB from a valley portion of concavity and convexity structuring the lens unit to the surface at the opposite side, a width A of the light transmission parts, a pitch P between the parallel convex cylindrical lenses, and a critical angle α
at an interface with the lenticular sheet at the light transmission parts,a relation of P≦
A+2*TB*tanα
is formed. - View Dependent Claims (2, 3, 4, 5)
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6. An optical sheet which is used for light control illumination in a backlight unit for a display, comprising:
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in order from an incident side of an illuminating light, at least a light scattering layer which scatters the illuminating light toward an outgoing surface side serving as a non-incident surface side; an adhesion layer or an adhesive layer; and a lens sheet including a light reflection layer which is made to adhere or stick to the light scattering layer by the adhesion layer or the adhesive layer, which has a surface with high light reflectivity so as to face the outgoing surface side of the light scattering layer, and which reflects light scattered by the light scattering layer toward the light scattering layer side, wherein the lens sheet includes a lens unit whose flat rear face is fixed to the other side of the light reflection layer, and in which unit lenses comprising convex cylindrical lenses are formed in parallel on a surface, wherein the lens sheet includes light reflection parts at areas including non-light condensing areas by the lens unit; and
light transmission parts at areas other than the light reflection parts, respectively on a surface at a reverse side opposite to the lens unit,wherein among a distance TB from a valley portion of concavity and convexity to the surface at the opposite side, a parallel pitch P between the convex cylindrical lenses, and a critical angle α
at an interface with the lenticular sheet at the light transmission parts, the following relationship is established;
P≦
A+2*TB*tanαwherein the adhesion layer or the adhesive layer is thinner than the light reflection layer. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification