Optical sheet

• US 20070126074A1
• Filed: 11/16/2006
• Published: 06/07/2007
• Est. Priority Date: 12/07/2005
• Status: Abandoned Application

• Current Assignee: Eternal Chemical Company Limited
• Original Assignee: Eternal Chemical Company Limited
• Inventors: Chuang, Shih-Yi, Tsai, Chao-Yi
• Application Number:
  US11/601,350
• Publication Number:
  US 20070126074A1
• Time in Patent Office: Days
• US Class Current: 257/432
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0247 by means of voids or pores
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

An optical sheet includes an substrate having a first surface and a second surface opposite to the first surface, a light gathering layer formed on the first surface of the substrate, and an light diffusion layer formed on the second surface of the substrate. The light diffusion layer includes a polymeric resin having a plurality of bubbles mixed therein. The optical sheet of the subject invention can be used in LCDs as a photo-diffusive brightness enhancement film.

Claims

1. An optical sheet, comprising:

a substrate having a first surface and a second surface opposite to said first surface;

a light gathering layer formed on said first surface of said substrate; and

a light diffusion layer formed on said second surface of said substrate, and comprising a polymeric resin having bubbles mixed therein.

2. The optical sheet of claim 1, wherein said light gathering layer has at least one microstructure.

3. The optical sheet of claim 2, wherein the microstructure is selected from the group consisting of a regular prismatic pattern, an irregular prismatic pattern, an annular prismatic pattern, a cube-corner pattern, a bead-like pattern and a lens-like pattern.

4. The optical sheet of claim 1, wherein the polymeric resin is a thermosetting resin or an UV curable resin.

5. The optical sheet of claim 4, wherein said UV curable resin is an acrylic UV curable resin selected from the group consisting of methacrylate resin, urethane acrylate resin, polyester acrylate resin, epoxy acrylate resin, and mixtures thereof.

6. The optical sheet of claim 1, wherein said substrate is made from a plastic material selected from the group consisting of polyethylene terephthalate (PET) resin, polymethyl methacrylate (PMMA) resin, polyethylene (PE) resin, polypropylene (PP) resin, polyimide resin, polycarbonate resin, polyurethane (PU) resin, triacetate cellulose, and mixtures thereof.

7. The optical sheet of claim 5, wherein said plastic material is selected from the group consisting of polyethylene terephthalate (PET) resin, polymethyl methacrylate (PMMA) resin, triacetate cellulose, and mixtures thereof.

8. The optic sheet of claim 1, wherein said light gathering layer is made from a resin selected from the group consisting of polyester resin, polyacrylate resin, polycarbonate resin, and mixtures thereof.