US4152618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-emitting display device including light diffusing film
Assignee: Toshiba Corp
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Filing: 1978-03-29
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Granted: 1979-05-01
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Expires: 1998-03-29
Abstract
Abstract A light-emitting display device comprising a light-emitting element, a substrate on which the light-emitting element is disposed, a reflector for reflecting the light from the light-emitting element, and a light diffusing film disposed apart from the light-emitting element for dispersing the light. The light diffusing film consists of a light diffusing part of a fibriform light diffusing material and a transparent part.
Inventors
- 👤 Osamu Abe
- 👤 Hiroshi Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:51
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/855; H10H20/882; Y; Y10; Y10S; Y10S362/00; Y10S362/80
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
78 words
A light-emitting display device comprising: (a) a light-emitting element; (b) a substrate on which said light-emitting element is disposed; (c) a reflector mounted on said substrate so as to surround said light emitting element for reflecting the light from said light-emitting element; and (d) a light diffusing film disposed apart from said light-emitting element, said light diffusing film including a light diffusing part with a fibriform light diffusing material and a transparent part made of a transparent material.
Claim 2
Dependent Claim
78 words
A light-emitting display device comprising: (a) a light-emitting element; (b) a substrate on which said light-emitting element is disposed; (c) a reflector mounted on said substrate so as to surround said light emitting element for reflecting the light from said light-emitting element; and (d) a light diffusing film disposed apart from said light-emitting element, said light diffusing film including a light diffusing part with a fibriform light diffusing material and a transparent part made of a transparent material.
Claim 3
Dependent Claim
19 words
The light-emitting display device of claim 1 wherein the surface of said fibriform light diffusing material is substantially rough.
Claim 4
Dependent Claim
25 words
The light-emitting display device of claim 1 wherein said fibriform light diffusing material is different from said transparent material with regard to the refractive efficiency.
Claim 5
Dependent Claim
18 words
The light-emitting display device of claim 3 wherein said fibriform light diffusing material is in a rod configuration.
Claim 6
Dependent Claim
22 words
The light-emitting display device of claim 4 wherein said fibriform light diffusing rods are arranged to be substantially parallel at regular intervals.
Claim 7
Dependent Claim
27 words
The light-emitting display device of claim 1 wherein the area ratio of said light diffusing part to said transparent part is equal to or less than one-fourth.
Claim 8
Dependent Claim
23 words
The light-emitting display device of claim 6 wherein the thickness of said transparent part between said fibriform light diffusing material is below 250μ.
Claim 9
Dependent Claim
18 words
The light-emitting display device of claim 4 wherein said fibriform light diffusing materials are arranged in a mesh.
Claim 10
Dependent Claim
16 words
The light-emitting display device of claim 1 wherein said transparent material is a high molecular compound.
Claim 11
Dependent Claim
17 words
The light-emitting display device of claim 9 wherein said high molecular compound consists of a thermo-plastic material.
Claim 12
Dependent Claim
26 words
The light-emitting display device of claim 10 wherein said thermo-plastic material is selected from the group consisting of acrylic-plastic, cellulose acetate, polyimide, polycarbonate, polyethylene and polystyrene.
Claim 13
Dependent Claim
17 words
The light-emitting display device of claim 9 wherein said high molecular compound consists of a thermo-indurative material.
Claim 14
Dependent Claim
24 words
The light-emitting display device of claim 12 wherein said thermo-indurative material is selected from the group consisting of epoxy resins, phenolic resin and polyurethane.
Claim 15
Dependent Claim
14 words
The light-emitting display device of claim 8 wherein said transparent material is a glass.
Claim 16
Dependent Claim
31 words
The light-emitting display device of claim 1 wherein said fibriform light diffusing material is selected from the group consisting of fiber glass, a fibriform high molecular compound and a vegetable fiber.
Claim 17
Dependent Claim
18 words
The light-emitting dislay device of claim 15 wherein said fibriform high molecular compound consists of a thermo-plastic material.
Claim 18
Dependent Claim
26 words
The light-emitting display device of claim 16 wherein said thermo-plastic material is selected from the group consisting of acrylic-plastic cellulose acetate, polyimide, polycarbonate, polyethylene and polystyrene.
Claim 19
Dependent Claim
18 words
The light-emitting display device of claim 15 wherein said fibriform high molecular compound consists of a thermo-indurative material.
Claim 20
Dependent Claim
24 words
The light-emitting display device of claim 18 wherein said thermo-indurative material is selected from the group consisting of epoxy resins, phenolic resin and polyurethane.
Claim 21
Dependent Claim
13 words
The light-emitting display device of claim 1 wherein said transparent material is air.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |