ANTI-REFLECTION FILM AND DISPLAY DEVICE

• US 20080130122A1
• Filed: 12/05/2007
• Published: 06/05/2008
• Est. Priority Date: 12/05/2006
• Status: Abandoned Application

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: EGI, Yuji, NISHI, Takeshi, YAMAZAKI, Shunpei, NISHIDA, Jiro
• Application Number:
  US11/950,690
• Publication Number:
  US 20080130122A1
• Time in Patent Office: Days
• US Class Current: 359/613
• CPC Class Codes: G02B 1/118 having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
• CPC Class Codes: G02B 26/026 based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167
• CPC Class Codes: G02B 5/003 Light absorbing elements
• CPC Class Codes: G02B 5/1809 with pitch less than or comparable to the wavelength
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Abstract

An object is to provide an anti-reflection film which has an anti-reflection function capable of further reducing reflection of incident light from external, and has excellent visibility, and a display device having the anti-reflection film. A plurality of adjacent hexagonal pyramidal projections is geometrically provided, so that reflection of light is prevented. A refractive index is changed from a display screen surface side to the outside (the air side) because of a physical form that is a hexagonal pyramid. The plurality of hexagonal pyramidal projections can be provided without gaps therebetween and each of six side surfaces thereof is provided at an different angle from a base; thus, light can be sufficiently scattered in many directions.

Claims

1. An anti-reflection film comprising:

a plurality of hexagonal pyramidal projections,

wherein six of the hexagonal pyramidal projections are arranged around and adjacent to one of the hexagonal pyramidal projections, and

wherein each side of a base forming the one of the hexagonal pyramidal projections is arranged to be in contact with one side of a base forming corresponding one of the six of the hexagonal pyramidal projections.

2. An anti-reflection film according to claim 1 wherein apexes of the plurality of hexagonal pyramidal projections are arranged at regular intervals.

3. An anti-reflection film according to claim 1 wherein apexes of the plurality of hexagonal pyramidal projections are arranged at regular intervals, and

wherein length of sides of bases forming the plurality of hexagonal pyramidal projections are equal to each other.

4. An anti-reflection film according to claim 1, wherein an interval between the apexes of the plurality of hexagonal pyramidal projections is less than or equal to 350 nm, and a height of each of the plurality of hexagonal pyramidal projections is greater than or equal to 800 nm.

5. An anti-reflection film according to claim 1, wherein a filling rate of the bases of the plurality of hexagonal pyramidal projections per unit area is greater than or equal to 80%.

6. An anti-reflection film according to claim 2, wherein an interval between the apexes of the plurality of hexagonal pyramidal projections is less than or equal to 350 nm, and a height of each of the plurality of hexagonal pyramidal projections is greater than or equal to 800 nm.

7. An anti-reflection film according to claim 2, wherein a filling rate of the bases of the plurality of hexagonal pyramidal projections per unit area is greater than or equal to 80%.

8. An anti-reflection film according to claim 3, wherein an interval between the apexes of the plurality of hexagonal pyramidal projections is less than or equal to 350 nm, and a height of each of the plurality of hexagonal pyramidal projections is greater than or equal to 800 nm.

9. An anti-reflection film according to claim 3, wherein a filling rate of the bases of the plurality of hexagonal pyramidal projections per unit area is greater than or equal to 80%.

10. A display device comprising:

a plurality of hexagonal pyramidal projections over a display screen,

wherein six of the hexagonal pyramidal projections are arranged around and adjacent to one of the hexagonal pyramidal projections, and

wherein each side of a base forming the one of the hexagonal pyramidal projections is arranged to be in contact with one side of a base forming corresponding one of the six of the hexagonal pyramidal projections.

11. A display device according to claim 10 wherein apexes of the plurality of hexagonal pyramidal projections are arranged at regular intervals.

12. A display device according to claim 10 wherein apexes of the plurality of hexagonal pyramidal projections are arranged at regular intervals, and

wherein lengths of sides of bases forming the plurality of hexagonal pyramidal projections are equal to each other.

13. A display device according to claim 10, wherein an interval between the apexes of the plurality of hexagonal pyramidal projections is less than or equal to 350 nm, and a height of each of the plurality of hexagonal pyramidal projections is greater than or equal to 800 nm.

14. A display device according to claim 10, wherein a filling rate of the bases of the plurality of hexagonal pyramidal projections per unit area on a display screen surface is greater than or equal to 80%.

15. A display device according to claim 11, wherein an interval between the apexes of the plurality of hexagonal pyramidal projections is less than or equal to 350 nm, and a height of each of the plurality of hexagonal pyramidal projections is greater than or equal to 800 nm.

16. A display device according to claim 11, wherein a filling rate of the bases of the plurality of hexagonal pyramidal projections per unit area on a display screen surface is greater than or equal to 80%.

17. A display device according to claim 12, wherein an interval between the apexes of the plurality of hexagonal pyramidal projections is less than or equal to 350 nm, and a height of each of the plurality of hexagonal pyramidal projections is greater than or equal to 800 nm.

18. A display device according to claim 12, wherein a filling rate of the bases of the plurality of hexagonal pyramidal projections per unit area on a display screen surface is greater than or equal to 80%.

19. A display device according to claim 10 wherein the display device is incorporated into one selected from the group consisting of a television device, a portable information terminal device, a digital video camera, a cellular phone, a computer and a slot machine.