# US 8,786,951 B2 · Composite optical film

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- Number: US 8,786,951 B2
- Document ID: US8786951B2
- Status: Granted
- Kind: B2
- Application number: 13/169,023
- Filed: 2011-06-27
- Published: 2012-01-12
- Granted: 2014-07-22
- Earliest claimed: 2010-07-09
- Assignees: Eternal Chemical Co., Ltd.
- Applicants: Hsung-Hsing Wang; Po-Wen Lin; Yi-Chia Wang; Jui-Kai Hu
- Inventors: Hsung-Hsing Wang; Po-Wen Lin; Yi-Chia Wang; Jui-Kai Hu
- Web page: https://patentgrep.com/patent/US8786951B2

## CPC

- G02B 5/0242: {by means of dispersed particles}
- G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A composite optical film is provided. The composite optical film sequentially includes a substrate, a light diffusion layer, and a light-gathering layer. The light diffusion layer includes a binder and plural micro beads dispersed therein. The thickness of the light diffusion layer is 2-6 times of the average diameter of the micro beads, and the distance between adjacent micro beads is smaller than the average diameter of the micro beads. The light-gathering layer has plural light-gathering micro structures.

## Claims

### Claim 1

A composite optical film, comprising:
a substrate;
a light diffusion layer disposed on the substrate and comprising a plurality of micro beads and a binder, wherein a thickness of the light diffusion layer is 2-6 times of an average diameter of the micro beads, a distance between adjacent micro beads is smaller than the average diameter of the micro beads, and a coating amount of the light diffusion layer is about 2.7 g/cm2-20 g/cm2; and
a light-gathering layer disposed on the light diffusion layer and comprising a plurality of light-gathering micro structures.

### Claim 2 (depends on 1)

The composite optical film of claim 1, wherein the average diameter of the micro beads is 1-50 μm.

### Claim 3 (depends on 1)

The composite optical film of claim 1, wherein the average diameter of the micro beads is 3-20 μm.

### Claim 4 (depends on 1)

The composite optical film of claim 1, wherein a refractive index of the micro beads is smaller than a refractive index of the light-gathering layer and a difference between the refractive index of the micro beads and the refractive index of the light-gathering layer is 0.02-0.4.

### Claim 5 (depends on 1)

The composite optical film of claim 1, wherein the micro beads relative to a solid content of the binder is about 80 to about 210 parts by weight of the micro beads per 100 parts by weight of the solid content of the binder.

### Claim 6 (depends on 1)

The composite optical film of claim 1, wherein a material of the micro beads is plastic, metal oxide, or glass.

### Claim 7 (depends on 6)

The composite optical film of claim 6, wherein the plastic is acrylic resin, styrene resin, urethane resin, silicone resin, or any combinations thereof.

### Claim 8 (depends on 1)

The composite optical film of claim 1, wherein a material of the light-gathering layer comprises UV curable resin.

### Claim 9 (depends on 8)

The composite optical film of claim 8, wherein the UV curable resin is (meth)acrylate resin, urethane acrylate resin, polyester acrylate resin, epoxy acrylate resin, or any combinations thereof.

### Claim 10 (depends on 1)

The composite optical film of claim 1, wherein a shape of the light-gathering micro structures is a columnar structure, a conical structure, a solid angular structure, an orange petaline block structure, a lens-shaped structure, a capsular structure, or any combinations thereof.

### Claim 11 (depends on 10)

The composite optical film of claim 10, wherein the columnar structure is a prism columnar structure, an arc columnar structure, or a mixture thereof.

### Claim 12 (depends on 10)

The composite optical film of claim 10, wherein the columnar structure is a prism columnar structure having an apical angle of 40°-120°.

### Claim 13 (depends on 1)

The composite optical film of claim 1, further comprising a scratch-resistant layer disposed on a bottom of the substrate.