# US 8,771,453 B2 · Method for manufacturing liquid crystal panel

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- Number: US 8,771,453 B2
- Document ID: US8771453B2
- Status: Granted
- Kind: B2
- Application number: 13/124,151
- Filed: 2009-10-07
- Published: 2011-08-11
- Granted: 2014-07-08
- Earliest claimed: 2008-10-16
- Assignees: Nitto Denko Corporation
- Applicants: Kohei Yano; Minoru Miyatake
- Inventors: Kohei Yano; Minoru Miyatake
- Web page: https://patentgrep.com/patent/US8771453B2

## CPC

- G02F 1/133528: {Polarisers}
- B32B 37/02: characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
- B32B 37/1284: {Application of adhesive}
- B32B 2038/0028: {Stretching, elongating}
- B32B 2307/42: Polarizing, birefringent, filtering
- B32B 2457/202: LCD, i.e. liquid crystal displays
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

There is provided a method for manufacturing a liquid crystal panel comprises the steps of: (Step A1) manufacturing a polarizing film including a laminate composed of a first base film and a polarizing thin layer, the step including: applying a vinyl alcohol-based polymer on a surface of the first base film to form a vinyl alcohol-based polymer thin layer; and wet dyeing the vinyl alcohol-based polymer thin layer after stretching the thin layer together with the first base film to obtain a polarizing thin layer, and (Step B1) adhering the polarizing film without an adhesion layer during storage and transportation at least to one surface of a liquid crystal cell through an adhesion layer in a liquid crystal panel manufacturing process.

## Claims

### Claim 1

A method for manufacturing a liquid crystal panel including a polarizing film which includes a laminate composed of a first base film and a polarizing thin layer having a polarization degree of 99% or higher and a transmittance of 39% to 46%, an adhesion layer, and a liquid crystal cell in this order, the method comprising the steps of:
(step A1) manufacturing a polarizing film roll, the step comprising:
applying a vinyl alcohol-based polymer on a surface of the long first base film to form a vinyl alcohol-based polymer thin layer;
wet dyeing the vinyl alcohol-based polymer thin layer after stretching the thin layer together with the long first base film to obtain a polarizing thin layer to provide the polarizing film in a polarizing film manufacturing process;
winding up the polarizing film to be the polarizing film roll; and
storing and transporting the polarizing film roll without an adhesion layer, and
(step B1) performing a first step of forming an adhesive layer on an adhesive surface of one of the polarizing film and the liquid crystal cell while rewinding the polarizing film roll and a second step of adhering the polarizing film to the liquid crystal cell, the first and second steps being carried out in a series of production lines of a liquid crystal panel manufacturing process.

### Claim 2

A method for manufacturing a liquid crystal panel including a long polarizing film which includes a laminate composed of a second base film and a polarizing thin layer having a polarization degree of 99% or higher and a transmittance of 39% to 46%, an adhesion layer, and a liquid crystal cell in this order, the method comprising the steps of:
(step A2) manufacturing a polarizing film roll including a laminate composed of a long second base film and a polarizing thin layer, the step comprising:
applying a vinyl alcohol-based polymer on a surface of the long first base film to form a vinyl alcohol-based polymer thin layer in a polarizing film manufacturing process;
wet dyeing the vinyl alcohol-based polymer thin layer after stretching the thin layer together with the long first base film to obtain a polarizing thin layer;
releasing the long first base film while or after laminating the polarizing thin layer on the long second base film to provide the long polarizing film;
winding up the long polarizing film to be the polarizing film roll; and
storing and transporting the polarizing film roll without an adhesion layer; and
(step B2) performing a first step of forming an adhesive layer on an adhesive surface of one of the polarizing film and the liquid crystal cell while rewinding the polarizing film roll and a second step of adhering the polarizing film to the liquid crystal cell, the first and second steps being carried out in a series of production lines of a liquid crystal panel manufacturing process.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising the steps of: manufacturing the polarizing film in step A1 in a polarizing film manufacturing plant; transporting the obtained polarizing film roll without an adhesion layer for adhering to the liquid crystal cell to a liquid crystal panel manufacturing plant; and
performing step B1 in the liquid crystal panel manufacturing plant.

### Claim 4 (depends on 2)

The method according to claim 2, further comprising the steps of:
manufacturing the polarizing film in step A2 in a polarizing film manufacturing plant; transporting the obtained polarizing film roll without an adhesion layer for adhering to the liquid crystal cell to a liquid crystal panel manufacturing plant; and
performing step B2 in the liquid crystal panel manufacturing plant.

### Claim 5 (depends on 1, 2, 3, 4)

The method according to any one of claims 1 to 4, wherein the polarizing thin layer has a thickness of 1 μm to 6 μm.