Manufacturing method for liquid crystal display

Patent metadata

Field	Value
Publication number	US-9244307-B2
Application number	US-201314373866-A
Country	US
Kind code	B2
Filing date	Mar 14, 2013
Priority date	Mar 14, 2012
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A manufacturing method for a liquid crystal display panel includes the steps of slitting a first optical film which includes a polarizing film having an absorption axis in its width direction, the polarizing film including a polyvinyl alcohol-based resin film containing a dichromatic substance and has an Nz coefficient of 1.10 or more, and rolling the slit first optical film in its width direction; slitting a second optical film, which includes a polarizing film having an absorption axis in its longitudinal direction, and rolling the slit second optical film in its width direction; bonding the cut first optical film onto one surface of the liquid crystal cell; and bonding the cut second optical film onto another surface of the liquid crystal cell.

First claim

The invention claimed is:

1. A manufacturing method for a liquid crystal display panel including a liquid crystal cell and optical films arranged on both sides of the liquid crystal cell,
the manufacturing method comprising the steps of:
cutting, while feeding a first optical film from an optical film roll, the optical film roll being obtained by slitting the first optical film having an elongate shape, which includes a polarizing film having an absorption axis in its width direction, the polarizing film including a polyvinyl alcohol-based resin film that contains a dichromatic substance and has an Nz coefficient of 1.10 or more, so as to have a width corresponding to a pair of opposing sides of the liquid crystal cell, and by rolling the slit first optical film, the first optical film in its width direction so as to have a length corresponding to another pair of opposing sides of the liquid crystal cell;
cutting, while feeding a second optical film from an optical film roll, the optical film roll being obtained by slitting the second optical film having an elongate shape, which includes a polarizing film having an absorption axis in its longitudinal direction, so as to have a width corresponding to a pair of opposing sides of the liquid crystal cell, and by rolling the slit second optical film, the second optical film in its width direction so as to have a length corresponding to another pair of opposing sides of the liquid crystal cell;
bonding the cut first optical film onto one surface of the liquid crystal cell; and
bonding the cut second optical film onto another surface of the liquid crystal cell.

2. A manufacturing method for a liquid crystal display panel according to claim 1 , wherein the first optical film further includes a reflective polarizing film having a reflection axis in its width direction.

3. A manufacturing method for a liquid crystal display panel according to claim 1 , wherein the bonding comprises bonding one of the cut first optical film and the cut second optical film onto the one surface of the liquid crystal cell, and then bonding another of the cut first optical film and the cut second optical film onto the another surface of the liquid crystal cell.

4. A manufacturing method for a liquid crystal display panel according to claim 1 ,
wherein the width of the first optical film and the width of the second optical film each correspond to a short side of the liquid crystal cell, and
wherein the length of the cut first optical film and the length of the cut second optical film each correspond to a long side of the liquid crystal cell.

5. A manufacturing method for a liquid crystal display panel according to claim 1 ,
wherein the width of the first optical film and the width of the second optical film each correspond to a long side of the liquid crystal cell, and
wherein the length of the cut first optical film and the length of the cut second optical film each correspond to a short side of the liquid crystal cell.

6. A manufacturing method for a liquid crystal display panel according to claim 1 , wherein the bonding comprises bonding the cut first optical film onto a surface of the liquid crystal cell on an opposite side to a viewer side.

7. A manufacturing method for a liquid crystal display panel according to claim 1 ,
wherein the first optical film includes the polarizing film, a pressure-sensitive adhesive layer, and a release film in the stated order, and
wherein the cutting comprises cutting the first optical film except for the release film.

8. A manufacturing method for a liquid crystal display panel according to claim 1 , wherein the liquid crystal cell comprises a liquid crystal cell of a VA mode or a liquid crystal cell of an IPS mode.

9. A manufacturing method for a liquid crystal display panel including a liquid crystal cell and optical films arranged on both sides of the liquid crystal cell,
the manufacturing method comprising the steps of:
bonding, while feeding a first optical film from an optical film roll, the optical film roll being obtained by slitting the first optical film having an elongate shape, which includes a polarizing film having an absorption axis in its width direction, the polarizing film including a polyvinyl alcohol-based resin film that contains a dichromatic substance and has an Nz coefficient of 1.10 or more, a pressure-sensitive adhesive layer, and a release film in the stated order, so as to have a width corresponding to a pair of opposing sides of the liquid crystal cell, forming cutting portions in a width direction of the first optical film except for the release film at an interval corresponding to another pair of opposing sides of the liquid crystal cell, and by rolling the first optical film, the first optical film onto one surface of the liquid crystal cell by peeling off the release film at each of the cutting portions; and
bonding, while feeding a second optical film from an optical film roll, the optical film roll being obtained by slitting the second optical film having an elongate shape, which includes a polarizing film having an absorption axis in its longitudinal direction, a pressure-sensitive adhesive layer, and a release film in the stated order, so as to have a width corresponding to a pair of opposing sides of the liquid crystal cell, forming cutting portions in a width direction of the second optical film except for the release film at an interval corresponding to another pair of opposing sides of the liquid crystal cell, and by rolling the second optical film, the second optical film onto another surface of the liquid crystal cell by peeling off the release film at each of the cutting portions.

10. A manufacturing method for a liquid crystal display panel according to claim 9 , wherein the first optical film further includes a reflective polarizing film having a reflection axis in its width direction.

11. A manufacturing method for a liquid crystal display panel including a liquid crystal cell and an optical film arranged on at least one side of the liquid crystal cell,
the manufacturing method comprising the steps of:
cutting, while feeding the optical film from an optical film roll, the optical film roll being obtained by slitting the optical film having an elongate shape, which includes a polarizing film having an absorption axis in its width direction, the polarizing film including a polyvinyl alcohol-based resin film that contains a dichromatic substance and has an Nz coefficient of 1.10 or more, so as to have a width corresponding to a pair of opposing sides of the liquid crystal cell, and by rolling the slit optical film, the optical film in its width direction so as to have a length corresponding to another pair of opposing sides of the liquid crystal cell; and
bonding the cut optical film onto one surface of the liquid crystal cell.

12. A manufacturing method for a liquid crystal display panel according to claim 11 , further comprising bonding, after the bonding the cut optical film onto the one surface of the liquid crystal cell, another optical film including a polarizing film onto another surface of the liquid crystal cell.

13. A manufacturing method for a liquid crystal display panel according to claim 11 , wherein a surface of the liquid crystal cell on an opposite side to the one surface, onto which the cut optical film is to be bonded, has bonded thereonto another optical film including a polarizing film.

14. A manufacturing method for a liquid crystal display panel according to claim 11 , wherein the optical film further includes a reflective polarizing film having a reflection axis in its width direction.

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Assignees

• Nitto Denko Corp

Inventors

• Hada Kazuya
• Araki Tatsuya
• Kondo Seiji
• Hirata Satoshi

Classifications

• G02F1/1333

  Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• B32B2038/045

  Slitting · CPC title

• B29K2029/04

  PVOH, i.e. polyvinyl alcohol (B29K2031/04 takes precedence) · CPC title