Polarizer, polarizing plate, and image display apparatus

Patent metadata

Field	Value
Publication number	US-10101511-B2
Application number	US-201615042599-A
Country	US
Kind code	B2
Filing date	Feb 12, 2016
Priority date	Feb 16, 2015
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A polarizer according to an embodiment of the present invention includes a resin film having a thickness of 13 μm or less and containing iodine. The resin film has formed therein a low-concentration portion having a content of the iodine lower than that of another portion.

First claim

What is claimed is:

1. A polarizer, comprising a resin film having a thickness of 13 μm or less and containing iodine, wherein the resin film has formed therein a portion having a content of the iodine lower than that of another portion, and
wherein the content of the iodine in the portion having a content of the iodine lower than that of another portion is 1.0 wt % or less.

2. The polarizer according to claim 1 , wherein the polarizer has a single axis transmittance of 42.0% or more and a polarization degree of 99.95% or more in the another portion.

3. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion has a transmittance of 50% or more.

4. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion has a substantially circular shape having a diameter of 10 mm or less.

5. The polarizer according to claim 1 , wherein the thickness of the resin film is 8 μm or less.

6. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion corresponds to a camera hole portion of an image display apparatus on which the polarizer is mounted.

7. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion is formed by bringing a basic solution into contact with the resin film containing the iodine.

8. The polarizer according to claim 7 , wherein the basic solution comprises an aqueous solution of sodium hydroxide having a concentration of 1 wt % or more.

9. A polarizing plate, comprising the polarizer of claim 1 .

10. An image display apparatus, comprising the polarizing plate of claim 9 .

11. A method of producing the polarizer of claim 1 , the method comprising bringing a basic solution into contact with a resin film having a thickness of 13 μm or less and containing iodine.

12. The production method according to claim 11 , wherein the basic solution has a temperature of 20° C. or more.

13. The production method according to claim 11 , further comprising bringing an acidic solution into contact with a portion of the resin film with which the basic solution has been brought into contact.

14. The production method according to claim 11 , wherein the resin film comprises a resin layer formed on a substrate.

15. The production method according to claim 14 , wherein the resin layer comprises an applied layer.

Assignees

• Nitto Denko Corp

Inventors

• Goto Shusaku
• Ogomi Daisuke
• Yaegashi Masahiro

Classifications

• G02B5/3033 Primary

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

• G02B5/305 Primary

  including organic materials, e.g. polymeric layers · CPC title