Method and system for producing liquid crystal panel

• US 9,348,158 B2
• Filed: 06/22/2011
• Issued: 05/24/2016
• Est. Priority Date: 06/24/2010
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Hada, Kazuya, Hirata, Satoshi, Kondo, Seiji
• Primary Examiner(s): Kim, Richard
• Application Number:
  US13/700,170
• Publication Number:
  US 20130070194A1
• Time in Patent Office: 1,798 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B29D 11/00288 made by a rotating cylinder
• CPC Class Codes: B29D 11/00644 polarizing
• CPC Class Codes: G02F 1/1303 Apparatus specially adapted to the manufacture of LCDs

Abstract

An object of the invention is to provide a method and a system for manufacturing a liquid crystal panel, which allow more successful bonding of an optical film to a liquid crystal cell. A pressing force Fa per unit area applied when the optical film is pressed by the first roller and a pressing force Fb per unit area applied when the liquid crystal cell is pressed by the second roller satisfy the relation Fa>Fb. On the first roller side, the feed may fail to be stabilized due to the influence of tension fluctuations or vibration acting on the first optical film, so that air bubbles may occur. When the second roller side, where such an influence does not occur, contributes more to the feed of the liquid crystal cell, the liquid crystal cell can be successfully fed in the process of bonding the optical film thereto.

Claims

1. A method for manufacturing a liquid crystal panel, comprising:

feeding a long laminate from a material roll, the long laminate comprising a release film and an optical film placed on the release film;

cutting the optical film into a predetermined size while leaving the release film uncut;

catching the optical film and a liquid crystal cell between a first roller and a second roller opposed to each other, while peeling off the release film from the optical film; and

applying a pressing force from the first roller to the optical film and applying a pressing force from the second roller to the liquid crystal cell, so that the optical film is bonded to the liquid crystal cell, wherein

a pressing force Fa per unit area applied when the optical film is pressed by the first roller and a pressing force Fb per unit area applied when the liquid crystal cell is pressed by the second roller satisfy the relation Fa>

Fb;

wherein the first roller has a constant diameter and the second roller has a constant diameter;

wherein the first and second rollers each have a circumference surface made of an elastically deformable material; and

wherein Fa is 0.08 MPa or more, and Fb is 0.49 MPa or less.

2. The method according to claim 1, wherein the first roller has a diameter of 15 mm to 80 mm.

3. The method according to claim 2, wherein a backup roller is provided in contact with an opposite side of the first roller from the liquid crystal cell.

4. The method according to claim 1, wherein Fa is 0.35 MPa or more.

5. A system for manufacturing a liquid crystal panel, comprising:

a feeding mechanism for feeding a long laminate from a material roll, the long laminate comprising a release film and an optical film placed on the release film;

a cutting apparatus for cutting the optical film into a predetermined size while leaving the release film uncut;

a peeling mechanism for peeling off the release film from the optical film;

a first roller and a second roller opposed to each other for bonding the optical film to a liquid crystal cell by a process comprising catching the optical film and the liquid crystal cell between the first and second rollers, while peeling off the release film from the optical film by using the peeling mechanism, and applying a pressing force from the first roller to the optical film and applying a pressing force from the second roller to the liquid crystal cell, wherein

a pressing force Fa per unit area applied when the optical film is pressed by the first roller and a pressing force Fb per unit area applied when the liquid crystal cell is pressed by the second roller satisfy the relation Fa>

Fb;

wherein the first roller has a constant diameter and the second roller has a constant diameter;

wherein the first and second rollers each have a circumference surface made of an elastically deformable material; and

wherein Fa is 0.08 MPa or more, and Fb is 0.49 MPa or less.

6. The system according to claim 5, wherein the first roller has a diameter of 15 mm to 80 mm.

7. The system according to claim 6, further comprising a backup roller provided in contact with an opposite side of the first roller from the liquid crystal cell.

8. The system according to claim 5, wherein Fa is 0.35 MPa or more.