Optical film material roll and method for manufacturing image display device using thereof

• US 8,911,838 B2
• Filed: 04/01/2010
• Issued: 12/16/2014
• Est. Priority Date: 04/10/2009
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Nakazono, Takuya, Umemoto, Seiji, Takita, Tomohito, Shimanoe, Fumihito, Yano, Yuuki, Oosawa, Teruaki
• Primary Examiner(s): Jacobson, Michele L
• Assistant Examiner(s): Zhang, Ruiyun
• Application Number:
  US13/058,278
• Publication Number:
  US 20110143056A1
• Time in Patent Office: 1,720 Days
• Field of Search: 428/1.3, 428/1.31, 428/1.33, 156/263, 349/96, 264/1.34
• US Class Current: 428/1.3
• CPC Class Codes: B32B 2041/04 Detecting wrong registration, misalignment, deviation, failure
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 41/00 Arrangements for controlling or monitoring lamination processes; Safety arrangements
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: C09K 2323/031 Polarizer or dye
• CPC Class Codes: C09K 2323/035 Ester polymer, e.g. polycarbonate, polyacrylate or polyester
• CPC Class Codes: G01N 2021/888 Marking defects
• CPC Class Codes: G02B 5/3041 comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: Y10T 156/1062 Prior to assembly
• CPC Class Codes: Y10T 156/1074 Separate cutting of separate sheets or webs
• CPC Class Codes: Y10T 156/1075 of plural laminae from single stock and assembling to each other or to additional lamina
• CPC Class Codes: Y10T 156/1085 One web only

Abstract

Disclosed is a material roll that includes a roll of an optical film having defect information markings printed thereon and is resistant to the formation of a defect by the transfer of a bump/dent deformation at the marking site. The material roll includes a long sheet of an optical film with polarizer wound into roll shape; and marking(s) formed at or in a vicinity of at least one defect site. The marking has an optical density of 1.5 or more, and a thickness of a center part of the marking is 1.5 μm or less. The marking preferably has an optical density per unit thickness of 2.5 μm⁻¹ or more.

Claims

1. A material roll, comprising:

a long sheet of an optical film wound into roll shape, the optical film comprising a polarizer, wherein

at least one marking is formed at or in a vicinity of at least one defect site of the optical film,

the marking has an optical density of 1.5 or more, and

a thickness of a center part of the marking is 1.5 μ

m or less;

wherein the marking is formed of ink from an inkjet printer or the marking is formed of ink from a pen, and

wherein the marking has an optical density per unit thickness of 2.5 μ

m<sup>−

1</sup> or more.

2. The material roll according to claim 1, wherein the optical film has a width that is entirely available for forming a product.

3. The material roll according to claim 1, wherein the marking has an absorption peak at a wavelength of 500 nm to 600 nm.