Display device and light enhancement film of the display device

• US 8,009,362 B1
• Filed: 06/01/2010
• Issued: 08/30/2011
• Est. Priority Date: 02/12/2010
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chen, Chih-Yen
• Primary Examiner(s): Ben; Loha
• Application Number:
  US12/791,002
• Publication Number:
  US 20110199670A1
• Time in Patent Office: 455 Days
• Field of Search: 359/296, 359/452, 359/454, 359/455, 359/462, 359/463, 359/619, 359/621, 359/623, 359/625, 359/628, 359/629, 359/642, 359/665, 359/741, 362/231, 362/235, 362/268, 362/244, 362/471, 362/511, 362/625, 362/626, 358/3.01, 358/3.24, 358/515, 136/246, 136/256, 257/99
• US Class Current: 359/619
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses

Abstract

A light enhancement film provided in the disclosure includes a substrate and an optical microstructure having a plurality of hexagonal cylindrical lenses inseparably arranged on a surface of the substrate in accordance with a honeycombed arrangement. Each of the hexagonal cylindrical lenses has different cross-sectional areas that are gradually narrowed from the surface of the substrate in a direction away from the substrate, and every two adjacent lenses have a gap therebetween. Furthermore, a display device having the light enhancement film is provided as well.

Claims

1. A light enhancement film, comprising:

a substrate; and

an optical microstructure having a plurality of hexagonal cylindrical lenses inseparably arranged on a surface of the substrate in accordance with a honeycombed arrangement,

wherein each of the hexagonal cylindrical lenses is gradually narrowed in girth from the substrate in a direction away from the substrate, and each of the hexagonal cylindrical lenses has a largest cross-sectional area on the surface of the substrate, and a smallest cross-sectional area furthest away from the substrate,

wherein two corresponding surfaces of every two adjacent hexagonal cylindrical lenses are spaced by a gap between the two adjacent hexagonal cylindrical lenses.

2. The light enhancement film according to claim 1, wherein the substrate and the optical microstructure are formed integrally in one.

3. The light enhancement film according to claim 1, wherein the optical microstructure is formed on the substrate.

4. The light enhancement film according to claim 3, wherein the optical microstructure comprises an ultraviolet curable material.

5. The light enhancement film according to claim 3, wherein an included angle formed between the two corresponding surfaces of the two adjacent hexagonal cylindrical lenses having the gap is in a range from 10 degrees to 45 degrees.

6. The light enhancement film according to claim 1, wherein a length between every two parallel edges of the largest cross-sectional area of each hexagonal cylindrical lens is in a range from 30 μ

m to 160 μ

m.

7. The light enhancement film according to claim 1, wherein a length between every two parallel edges of the smallest cross-sectional area of each hexagonal cylindrical lens is in a range from 12 μ

m to 96 μ

m.

8. The light enhancement film according to claim 1, wherein a first length is defined between every two parallel edges of the largest cross-sectional area of each hexagonal cylindrical lens,

a second length is defined between every two parallel edges of the smallest cross-sectional area of each hexagonal cylindrical lens,

wherein a ratio of the first length and the second length is in a range from 0.4 to 0.6.

9. A display device, comprising:

a reflective display module;

a light enhancement film according to claim 1 disposed on the reflective display module; and

a light-transmissive adhesive layer disposed between the reflective display module and the light enhancement film.

10. The display device according to claim 9, wherein a refractive index of the hexagonal cylindrical lenses and a refractive index of the light-transmissive adhesive layer are respectively in a range from 1.4 to 1.7.

11. The display device according to claim 10, wherein the reflective display module is a reflective liquid crystal display module or an electrophoretic display module.

12. A light enhancement film, comprising:

a substrate having a surface; and

an optical microstructure having a plurality of hexagonal cylindrical lenses arranged on the surface of the substrate, and every two adjacent hexagonal cylindrical lenses share a same edge,

wherein each of the hexagonal cylindrical lenses has a largest cross-sectional area on the surface of the substrate.

13. The light enhancement film according to claim 12, wherein each of the hexagonal cylindrical lenses has a smallest cross-sectional area furthest away from the substrate.

14. The light enhancement film according to claim 13, wherein a length between every two parallel edges of the smallest cross-sectional area of each hexagonal cylindrical lens is in a range from 12 μ

m to 96 μ

m.

15. The light enhancement film according to claim 13, wherein a first length is defined between every two parallel edges of the largest cross-sectional area of each hexagonal cylindrical lens,

a second length is defined between every two parallel edges of the smallest cross-sectional area of each hexagonal cylindrical lens,

wherein a ratio of the first length and the second length is in a range from 0.4 to 0.6.

16. The light enhancement film according to claim 12, wherein each of the hexagonal cylindrical lenses is gradually narrowed in a direction away from the substrate.

17. The light enhancement film according to claim 12, wherein two corresponding surfaces of every two adjacent hexagonal cylindrical lenses are spaced by a gap between the two adjacent hexagonal cylindrical lenses.

18. The light enhancement film according to claim 17, wherein an included angle formed between the two corresponding surfaces of the two adjacent hexagonal cylindrical lenses having the gap is in a range from 10 degrees to 45 degrees.

19. The light enhancement film according to claim 12, wherein a length between every two parallel edges of the largest cross-sectional area of each hexagonal cylindrical lens is in a range from 30 μ

m to 160 μ

m.