Light-emitting display device including light diffusing film

• US 4,152,618 A
• Filed: 03/29/1978
• Issued: 05/01/1979
• Est. Priority Date: 04/05/1977
• Status: Expired due to Term

• Current Assignee: Tokyo Shibaura Electric Co., Ltd. (Toshiba Corporation)
• Original Assignee: Tokyo Shibaura Electric Co., Ltd. (Toshiba Corporation)
• Inventors: Fujita, Hiroshi, Abe, Osamu
• Primary Examiner(s): Grimm, Siegfried H.
• Application Number:
  US05/891,405
• Time in Patent Office: 398 Days
• Field of Search: 313/113, 313/116, 313/501, 313/510, 313/512, 313/498, 313/499, 357/17, 307/311, 250/211 J, 350/188, 362/343, 362/355, 362/800
• US Class Current: 313/116
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

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.

Claims

1. 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.

2. The light-emitting display device of claim 1 wherein the surface of said fibriform light diffusing material is substantially rough.

3. 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.

4. The light-emitting display device of claim 3 wherein said fibriform light diffusing material is in a rod configuration.

5. The light-emitting display device of claim 4 wherein said fibriform light diffusing rods are arranged to be substantially parallel at regular intervals.

6. 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.

7. The light-emitting display device of claim 6 wherein the thickness of said transparent part between said fibriform light diffusing material is below 250μ

.

8. The light-emitting display device of claim 4 wherein said fibriform light diffusing materials are arranged in a mesh.

9. The light-emitting display device of claim 1 wherein said transparent material is a high molecular compound.

10. The light-emitting display device of claim 9 wherein said high molecular compound consists of a thermo-plastic material.

11. 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.

12. The light-emitting display device of claim 9 wherein said high molecular compound consists of a thermo-indurative material.

13. 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.

14. The light-emitting display device of claim 8 wherein said transparent material is a glass.

15. 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.

16. The light-emitting dislay device of claim 15 wherein said fibriform high molecular compound consists of a thermo-plastic material.

17. 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.

18. The light-emitting display device of claim 15 wherein said fibriform high molecular compound consists of a thermo-indurative material.

19. 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.

20. The light-emitting display device of claim 1 wherein said transparent material is air.