Method and system for manufacturing optical display panel

Patent metadata

Field	Value
Publication number	US-9256015-B2
Application number	US-201313960891-A
Country	US
Kind code	B2
Filing date	Aug 7, 2013
Priority date	Aug 10, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

Manufacturing method is for manufacturing an optical display panel including an optical cell and a pressure-sensitive adhesive layer-carrying optical film provided thereon with the pressure-sensitive adhesive layer interposed therebetween, which includes the steps of unwinding a multilayer optical film from a roll, feeding the multilayer optical film, feeding an optical cell, peeling off the optical film from a carrier film, and bonding the optical film to one side of the optical cell with a pressure-sensitive adhesive interposed therebetween, wherein the longitudinal length (L) of the carrier film between a position at which the multilayer optical film begins to be unwound in the film feeding step and a position at which peeling is started in the peeling step is 15 times or more the width (W) of the carrier film.

First claim

What is claimed is:

1. A method for manufacturing an optical display panel comprising an optical cell and a pressure-sensitive adhesive layer-carrying optical film provided on the optical cell with the pressure-sensitive adhesive layer interposed therebetween, the method comprising:
an unwinding step comprising providing a roll of a multilayer optical film comprising the optical film and a long carrier film placed on the optical film with the pressure-sensitive adhesive layer interposed therebetween and unwinding the multilayer optical film from the roll;
a film feeding step comprising feeding the multilayer optical film being unwound from the roll in the unwinding step;
an optical cell feeding step comprising feeding the optical cell;
a peeling step comprising peeling off the optical film from the carrier film by inwardly folding back the carrier film fed by the film feeding step; and
a bonding step comprising bonding the optical film, which is peeled off from the carrier film in the peeling step, to one side of the optical cell with the pressure-sensitive adhesive interposed therebetween while feeding the optical cell, wherein
the longitudinal length (L) of the carrier film between an unwinding position at which the multilayer optical film begins to be unwound in the film feeding step and a peeling position at which peeling is started in the peeling step is 15 times or more the width (W) of the carrier film.

2. The method according to claim 1 , further comprising:
a second unwinding step comprising providing a second roll of a second multilayer optical film comprising a second optical film having a pressure-sensitive adhesive layer and a second long carrier film placed on the second optical film with the pressure-sensitive adhesive layer interposed therebetween and unwinding the second multilayer optical film from the second roll;
a second film feeding step comprising feeding the second multilayer optical film being unwound from the second roll in the second unwinding step;
an optical cell feeding step comprising feeding the optical cell;
a second peeling step comprising peeling off the second optical film from the second carrier film by inwardly folding back the second carrier film fed by the second film feeding step; and
a second bonding step comprising bonding the second optical film, which is peeled off from the second carrier film in the second peeling step, to another side of the optical cell with the pressure-sensitive adhesive interposed therebetween while feeding the optical cell, wherein
the longitudinal length (L) of the second carrier film between an unwinding position at which the second multilayer optical film begins to be unwound in the second film feeding step and a peeling position at which peeling is started in the second peeling step is 15 times or more the width (W) of the second carrier film.

3. The method according to claim 2 , wherein the optical film is a polarizing film.

4. The method according to claim 3 , wherein the polarizing film has an absorption axis in a direction perpendicular to its longitudinal direction.

5. The method according to claim 3 , wherein the polarizing film has an absorption axis in a direction parallel to its longitudinal direction.

6. The method according to claim 1 , wherein the optical film is a polarizing film.

7. The method according to claim 6 , wherein the polarizing film has an absorption axis in a direction perpendicular to its longitudinal direction.

8. The method according to claim 6 , wherein the polarizing film has an absorption axis in a direction parallel to its longitudinal direction.

9. The method according to claim 1 , wherein the optical cell is an electroluminescent cell comprising an organic electroluminescent cell or an inorganic electroluminescent cell, and the multilayer optical film comprises a polarizing film having an absorption axis parallel or perpendicular to its longitudinal direction, a retardation film having a slow axis at an angle in the range of 35° to 55° with respect to the absorption axis of the polarizing film and having a retardation in the range of 110 nm to 170 nm at a wavelength of 550 nm, and an adhesive or a pressure-sensitive adhesive, wherein the polarizing film, the retardation film, and the adhesive or pressure-sensitive adhesive are arranged in this order.

Assignees

• Nitto Denko Corp

Inventors

• Umemoto Seiji
• Kimura Kouji
• Nakazono Takuya
• Hada Kazuya

Classifications

• B29C65/5057

  positioned between the surfaces to be joined (B29C65/5035 takes precedence) · CPC title

• G02F1/1303

  Apparatus specially adapted to the manufacture of LCDs · CPC title

• B65H2301/51122

  peeling layer of material · CPC title

• B29C66/71

  characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125) · CPC title

• B29C66/7338

  at least one of the parts to be joined being polarising · CPC title