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US 9,429,690 B2Granted
Diffusion sheet, backlight, liquid crystal display apparatus, and method of producing a diffusion sheet
AssigneeSony Corporation
InventorsJun Sasaki, Akihiro Horii
Life of this patent
Estimating the term…
Abstract
A diffusion sheet includes a light-transmissive substrate, a plurality of structures, and a flat portion. The light-transmissive substrate includes a first main surface, and a second main surface. The plurality of structures have convex shapes and are randomly formed on the first main surface. The flat portion is formed among the plurality of structures on the first main surface and has a surface roughness (Ra) of no less than 0.9 μm.
Claims6
A diffusion sheet, comprising:
- a light-transmissive substrate including:
- a first main surface;
- a second main surface;
- a plurality of convex-shaped structures randomly formed on the first main surface;
- and
- a portion where prisms are formed among the plurality of convex-shaped structures on the first main surface,
- wherein the portion has a surface roughness (Ra) of no less than 0.9 μm and wherein a side-surface angle of each of the plurality of convex-shaped structures with the first main surface is no less than 65 degrees and no more than 90 degrees.
4 more elements
A backlight, comprising:
- a diffusion sheet including:
- a light-transmissive substrate including:
- a first main surface;
- a second main surface;
- a plurality of convex-shaped structures randomly formed on the first main surface;
- a portion where prisms are formed among the plurality of convex-shaped structures on the first main surface, wherein the portion has a surface roughness (Ra) of no less than 0.9 μm, and wherein a side-surface angle of each of the plurality of convex-shaped structures with the first main surface is no less than 65 degrees and no more than 90 degrees;
- and
- a light source provided on a side of the second main surface.
5 more elements
A liquid crystal display apparatus, comprising:
- a diffusion sheet including:
- a light-transmissive substrate including:
- a first main surface,
- a second main surface,
- a plurality of convex-shaped structures randomly formed on the first main surface;
- a portion where prisms are formed among the plurality of convex-shaped structures on the first main surface, where the portion has a surface roughness (Ra) of no less than 0.9 μm, and wherein a side-surface angle of each of the plurality of convex-shaped structures with the first main surface is no less than 65 degrees and no more than 90 degrees;
- a light source provided on a side of the second main surface;
- and
- a liquid crystal panel provided on a side of the first main surface.
6 more elements
Dependencies are inferred from the claim text.