Optical Protection Sheet, Method for Manufacturing the Same, and Liquid Crystal Display Having the Same

• US 20080081174A1
• Filed: 09/28/2007
• Published: 04/03/2008
• Est. Priority Date: 09/29/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Seung
• Application Number:
  US11/863,995
• Publication Number:
  US 20080081174A1
• Time in Patent Office: Days
• US Class Current: 428/315.5
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: Y10T 428/249978 Voids specified as micro

Abstract

An optical protection sheet includes a foamy resin layer. The optical protection sheet includes a base film containing a light diffusion material and the foamy resin layer formed on the base film and containing micro-bubbles.

Claims

1. An optical protection sheet, comprising:

a base film comprising a light diffusion material; and

a foamy resin layer formed on the base film and containing micro-bubbles.

2. The optical protection sheet as claimed in claim 1, wherein the base film comprises polyethylene terephthalate (PET).

3. The optical protection sheet as claimed in claim 1, wherein the light diffusion material comprises beads made of a polymeric compound.

4. The optical protection sheet as claimed in claim 3, wherein the beads have a diameter of about 1 to 3 μ

m.

5. The optical protection sheet as claimed in claim 1, wherein the base film ha a thickness of about 50 to 100 μ

m.

6. The optical protection sheet as claimed in claim 1, wherein the foamy resin layer has a thickness of about 20 to 30 μ

m.

7. The optical protection sheet as claimed in claim 1, wherein the foamy resin layer comprises a foamy polyester resin, a foamy polyolefin resin or a foamy acrylonitrile butadiene styrene (ABS) resin.

8. A method for manufacturing an optical protection sheet, comprising the steps of:

mixing a light diffusion material with a resin;

forming a mixture of the light diffusion material and the resin into a base film through a rolling process,

applying a foamy resin on the base film; and

heat-treating an applied foamy resin to form a foamy resin layer containing micro-bubbles.

9. The method as claimed in claim 8, wherein the resin includes polyethylene terephthalate (PET).

10. The method as claimed in claim 8, wherein the light diffusion material comprises beads made of a polymeric compound.

11. The method as claimed in claim 10, wherein the beads have a diameter of about 1 to 3 μ

m.

12. The method as claimed in claim 8, wherein forming the base film comprises forming a base film with a thickness of about 50 to 100 μ

m.

13. The method as claimed in claim 8, wherein forming the foamy resin layer comprises forming a foamy resin layer with a thickness of about 20 to 30 μ

m.

14. The method as claimed in claim 8, wherein the foamy resin comprises a foamy polyester resin, a foamy polyolefin resin or a foamy acrylonitrile butadiene styrene (ABS) resin.

15. A liquid crystal display, comprising:

a liquid crystal display panel with polarizers attached to outer surfaces thereof;

a light source unit disposed below the liquid crystal display panel to provide light to the liquid crystal display panel; and

a plurality of optical sheets disposed between the liquid crystal display panel and the light source unit,

wherein the plurality of optical sheets comprise an optical protection sheet including a base film comprising a light diffusion material and a foamy resin layer formed on the base film and containing micro-bubbles.

16. The liquid crystal display as claimed in claim 15, wherein the plurality of optical sheets further comprise a diffusion sheet and a prism sheet arranged such that the diffusion sheet, the prism sheet and the optical protection sheet are sequentially stacked.

17. The liquid crystal display as claimed in claim 15, further comprising a light guide plate disposed below the plurality of optical sheets, wherein the light source unit comprises a light source disposed on at least one side of the light guide plate, and a reflector disposed around the light source.

18. The liquid crystal display as claimed in claim 15, wherein the light source unit comprises a plurality of lamps, and the plurality of lamps are arranged to be spaced apart from one another at predetermined intervals below the plurality of optical sheets.