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.
1 Assignment
0 Petitions
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.
34 Citations
22 Claims
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1. An optical sheet which is used for light control illumination in a backlight unit for a display, comprising:
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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, whereinamong 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 (7, 8)
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2. 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, whereinamong a height TL of concavity and convexity structuring the lens unit, a distance TB from a valley portion of the concavity and convexity up to the surface at the opposite side, a width A of the light transmission parts, and a parallel pitch P between the convex cylindrical lenses, relations of 0.3 <
TL/P <
0.6,0.3 <
TB/P <
1.0, and0.3 <
A/P <
0.6 are formed.
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3. 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, whereinwith respect to the lenticular sheet, on the boundary between unit lenses adjacent to one another, a tangent line at a valley portion of the adjacent unit lenses is within a range of 35 to 60°
.
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4. An optical sheet which is used for light control illumination in a backlight unit for a display, comprising:
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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, whereinthe light transmission parts are not flat surfaces, and convex portions or concave portions are formed on the surface thereof.
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5. An optical sheet which is used for light control illumination in a backlight unit for a display, comprising:
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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, whereineither convex cylindrical lenses or concave cylindrical lenses are formed on the light transmission parts.
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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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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, whereinthe light reflection parts are disposed in a strip form so as to form convex portions on the surface at the side opposite to the lens unit, and so as to correspond to the respective unit lenses which are the convex cylindrical lenses one-to-one.
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9. 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;
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; 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 a surface, wherein 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification