Converging sheet, surface light source unit, and transmission type display
First Claim
1. A converging sheet disposed in a surface light source unit containing a light source member formed of a plurality of light sources arranged in parallel, the converging sheet having a sheet face and converging light from the light source member, the converging sheet comprising:
- a lens member formed of a plurality of unit lenses of convex shape that are arranged on a light-emerging side of the converging sheet at a predetermined lens pitch; and
a scattering layer that is formed in direct contact with the plurality of unit lenses so that the scattering layer conforms to the shape of the plurality of unit lenseswherein each unit lens and an associated portion of said scattering layer converges some of the light that enters a light-incident side of the converging sheet and diffuses the remainder of the light that enters the light-incident side of the converging sheet, thereby increasing the front luminance of the light emitted from the converging sheet.
1 Assignment
0 Petitions
Accused Products
Abstract
A converging sheet includes a light-emerging-side lens member formed of a plurality of unit lenses of convex shape that are arranged on a light-emerging side, and a scattering layer that is formed along a surface of each unit lens and scatters light. The scattering layer includes light diffusing particles. A thickness t of the scattering layer is equal to or more than one-tenth the lens pitch p. The converging sheet satisfies the following relationships: d×((t+h+p)/φ)>50% and d×(t/φ)<50%, in which d represents a volume ratio (%) of the light diffusing particles mixed in the scattering layer relative to the scattering layer, φ represents an average grain diameter (mm) of the light diffusing particles, and h represents a height from the apex to a bottom of the convex shape of the unit lens.
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Citations
23 Claims
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1. A converging sheet disposed in a surface light source unit containing a light source member formed of a plurality of light sources arranged in parallel, the converging sheet having a sheet face and converging light from the light source member, the converging sheet comprising:
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a lens member formed of a plurality of unit lenses of convex shape that are arranged on a light-emerging side of the converging sheet at a predetermined lens pitch; and a scattering layer that is formed in direct contact with the plurality of unit lenses so that the scattering layer conforms to the shape of the plurality of unit lenses wherein each unit lens and an associated portion of said scattering layer converges some of the light that enters a light-incident side of the converging sheet and diffuses the remainder of the light that enters the light-incident side of the converging sheet, thereby increasing the front luminance of the light emitted from the converging sheet. - View Dependent Claims (2, 3, 4, 5, 6, 21)
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7. A surface light source unit disposed on a rear side of a transmission type display member, comprising:
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a light source member formed of a plurality of light sources arranged in parallel; and a converging sheet having a sheet face and converging light from the light source member;
whereinthe converging sheet comprises; a lens member formed of a plurality of unit lenses of convex shape that are arranged on a light-emerging side of the converging sheet at a predetermined lens pitch, and a scattering layer that is formed in direct contact with the plurality of unit lenses so that the scattering layer conforms to the shape of the plurality of unit lenses, wherein each unit lens and an associated portion of said scattering layer converges some of the light that enters a light-incident side of the converging sheet and diffuses the remainder of the light that enters the light-incident side of the converging sheet, thereby increasing the front luminance of the light emitted from the converging sheet. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 22)
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15. A transmission type display comprising:
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a transmission type display member; and a surface light source unit disposed on a rear side of the transmission type display member, including;
a light source member formed of a plurality of light sources arranged in parallel; and
a converging sheet converging light from the light source member;
whereinthe converging sheet comprises; a lens member formed of a plurality of unit lenses of convex shape that are arranged on a light-emerging side of the converging sheet at a predetermined lens pitch; and a scattering layer that is formed in direct contact with the plurality of unit lenses so that the scattering layer conforms to the shape of the plurality of unit lenses, wherein each unit lens and associated portion of said scattering layer converges some of the light that enters a light-incident side of the converging sheet and diffuses the remainder of the light that enters the light-incident side of the converging sheet, thereby increasing the front luminance of the light emitted from the converging sheet. - View Dependent Claims (16, 17, 18, 19, 20, 23)
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Specification