# US 10,120,113 B2 · Polarizing plate and image display device comprising the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,120,113 B2
- Document ID: US10120113B2
- Status: Granted
- Kind: B2
- Application number: 15/680,636
- Filed: 2017-08-18
- Published: 2018-03-01
- Granted: 2018-11-06
- Earliest claimed: 2016-08-23
- Assignees: Dongwoo Fine-Chem Co., Ltd.
- Applicants: Dongwoo Fine-Chem Co., Ltd.
- Inventors: Eunyoung Kim; Yong Won Seo; Kwanwook Song
- Web page: https://patentgrep.com/patent/US10120113B2

## CPC

- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present invention provides a polarizing plate comprising a substrate, a polarizing coating layer formed on one side of the substrate, a first adhesive layer formed on the polarizing coating layer, a first retardation coating layer formed on the first adhesive layer, a second adhesive layer formed on the first retardation coating layer, a second retardation coating layer formed on the second adhesive layer, and a soft layer formed on the second retardation coating layer, wherein, the soft layer has an amended toughness of 1,000 to 40,000 MPa·%. The polarizing plate according to the present invention has excellent bending resistance and thus can be effectively used for a flexible display.

## Claims

### Claim 1

A polarizing plate comprising a substrate, a polarizing coating layer formed on one side of the substrate, a first adhesive layer formed on the layer formed on the first adhesive layer, a second adhesive layer formed on the first retardation coating layer, a second retardation coating layer formed on the second adhesive layer and a soft layer formed on the second retardation coating layer, wherein the soft layer has an amended toughness defined by the following Equation 1 of 1,000 to 40,000 MPa·%:
Amended toughness=Maximum stress×maximum strain [Equation 1]
wherein,
the maximum stress represents the stress at the fracture point in a stress-strain curve, and
the maximum strain represents the strain at the fracture point in the stress-strain curve.

### Claim 2 (depends on 1)

The polarizing plate of claim 1, wherein the first retardation coating layer is a λ/4 layer, and the second retardation coating layer is a positive C layer.

### Claim 3 (depends on 2)

An image display device comprising the polarizing plate of claim 2.

### Claim 4 (depends on 1)

The polarizing plate of claim 1, wherein the first retardation coating layer is a positive C layer, and the second retardation coating layer is a λ/4 layer.

### Claim 5 (depends on 4)

An image display device comprising the polarizing plate of claim 4.

### Claim 6 (depends on 1)

The polarizing plate of claim 1, wherein the first adhesive layer or the second adhesive layer is a pressure sensitive adhesive layer formed by a pressure sensitive adhesive or an adhesive layer formed by an adhesive.

### Claim 7 (depends on 6)

An image display device comprising the polarizing plate of claim 6.

### Claim 8 (depends on 1)

The polarizing plate of claim 1, wherein the soft layer is a coating layer.

### Claim 9 (depends on 8)

An image display device comprising the polarizing plate of claim 8.

### Claim 10 (depends on 8)

The polarizing plate of claim 8, wherein the soft layer is formed from a composition for forming a soft layer including a urethane acrylate oligomer, a photoinitiator and a solvent.

### Claim 11 (depends on 10)

An image display device comprising the polarizing plate of claim 10.

### Claim 12 (depends on 1)

The polarizing plate of claim 1, wherein the soft layer is a substrate film.

### Claim 13 (depends on 12)

An image display device comprising the polarizing plate of claim 12.

### Claim 14 (depends on 1)

The polarizing plate of claim 1, further including a polarizing coating protective layer between the polarizing coating layer and the first adhesive layer.

### Claim 15 (depends on 14)

An image display device comprising the polarizing plate of claim 14.

### Claim 16 (depends on 1)

An image display device comprising the polarizing plate of claim 1.

### Claim 17 (depends on 1)

A flexible display comprising the polarizing plate of claim 1.