Optical member and display apparatus including the same

Patent metadata

Field	Value
Publication number	US-9296929-B2
Application number	US-201213692095-A
Country	US
Kind code	B2
Filing date	Dec 3, 2012
Priority date	Dec 1, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

An optical member, an optical adhesive, and a display apparatus, the optical member including a transparent conductive film; an optical adhesive layer on the transparent conductive film; and a polarizer plate stacked on the optical adhesive layer, wherein a surface resistance difference Rs 2− Rs 1 of a specimen including the optical adhesive layer is less than about 0.2Ω, the specimen being prepared by manufacturing the polarizer plate having the optical adhesive layer thereon and stacking two transparent conductive films on opposite upper sides of the optical adhesive layer, where Rs 1 is an initial surface resistance of the specimen and Rs2 is a surface resistance of the specimen kept at 70° C. and 95% RH for 48 hours.

First claim

What is claimed is:

1. An optical member, comprising:
a transparent conductive film;
an optical adhesive layer on the transparent conductive film; and
a polarizer plate stacked on the optical adhesive layer,
wherein a surface resistance difference Rs 2 −Rs 1 of a specimen including the optical adhesive layer is less than about 0.2Ω, the specimen being prepared by manufacturing the polarizer plate having the optical adhesive layer thereon and stacking two transparent conductive films on opposite upper sides of the optical adhesive layer, where Rs 1 is an initial surface resistance of the specimen and Rs 2 is a surface resistance of the specimen kept at 70° C. and 95% RH for 48 hours, and
wherein the optical adhesive layer includes a (meth)acrylic copolymer, the (meth)acrylic copolymer including about 0.01 to about 30 wt % of repeating units of an aromatic ring containing vinyl monomer, an alicyclic ring containing vinyl monomer, a pyrrolidonyl group containing vinyl monomer, a furyl group containing monomer, or a mixture thereof.

2. The optical member as claimed in claim 1 , wherein a surface resistance difference Rs 3 −Rs 1 of the specimen is less than about 0.2Ω, where Rs 3 is a surface resistance of the specimen kept at 60° C. and 95% RH for 500 hours.

3. The optical member as claimed in claim 1 , wherein the optical adhesive layer has an index of refraction of about 1.48 to about 1.50, as measured on a film having a thickness of about 10 μm to about 50 μm.

4. The optical member as claimed in claim 1 , wherein the optical adhesive layer has a loss modulus G″ of about 1.0E+04 to about 2.0E+04 dyne/cm 2 , as measured at a thickness of 25 μm at 25° C. and 1 Hz.

5. The optical member as claimed in claim 1 , wherein the optical adhesive layer has a ratio (G′/G″) of storage modulus G′ to loss modulus G″ of about 1 to about 6, as measured at a thickness of 25 μm at 25° C. and 1 Hz.

6. The optical member as claimed in claim 1 , wherein the (meth)acrylic copolymer has an acid value of less than about 0.5 mgKOH/g and a weight average molecular weight of about 800,000 to about 2,000,000 g/mol.

7. The optical member as claimed in claim 1 , wherein the monomer has an index of refraction of about 1.47 or more.

8. The optical member as claimed in claim 1 , wherein the copolymer includes the repeating units of the aromatic ring containing vinyl monomer, the aromatic ring containing vinyl monomer being represented by Formula 1 or 2:

wherein, in Formula 1, R 1 is hydrogen or a C1-C5 alkyl group, m is an integer from about 0 to 10, and X is a phenyl group, a methylphenyl group, a methylethylphenyl group, a methoxyphenyl group, a propylphenyl group, a cyclohexylphenyl group, a chlorophenyl group, a bromophenyl group, a phenylphenyl group, or a benzylphenyl group,

wherein, in Formula 2, R 2 is hydrogen or a C1-C5 alkyl group, m is an integer from about 0 to 10, Y is oxygen or sulfur, and Ar is a phenyl group, a methylphenyl group, a methylethylphenyl group, a methoxyphenyl group, a propylphenyl group, a cyclohexylphenyl group, a chlorophenyl group, a bromophenyl group, a phenylphenyl group, or a benzylphenyl group.

9. The optical member as claimed in claim 1 , wherein the (meth)acrylic copolymer includes:
the repeating units of (A) the aromatic ring containing vinyl monomer, the alicyclic ring containing vinyl monomer, the pyrrolidonyl group containing vinyl monomer, the furyl group containing monomer, or the mixture thereof,
repeating units of (B) an alkyl group containing vinyl monomer,
repeating units of (C) a hydroxyl group containing vinyl monomer, and
repeating units of (D) a carboxylic acid group containing vinyl monomer.

10. The optical member as claimed in claim 9 , wherein the repeating units of the (D) monomer are present in an amount of about 0.1 to about 4.9 wt % in the (meth)acrylic copolymer.

11. The optical member as claimed in claim 9 , wherein the (meth)acrylic copolymer includes the about 0.01 to about 30 wt % of repeating units of the (A) monomer, about 50 to about 90 wt % of the repeating units of the (B) monomer, about 0.1 to about 20 wt % of the repeating units of the (C) monomer, and about 0.1 to about 4.9 wt % of the repeating units of the (D) monomer.

12. The optical member as claimed in claim 1 , wherein the optical adhesive layer further includes an isocyanate curing agent or an epoxy curing agent.

13. The optical member as claimed in claim 12 , wherein the curing agent is present in an amount of about 0.01 to about 10 parts by weight, based on 100 parts by weight of the (meth)acrylic copolymer.

14. The optical member as claimed in claim 1 , wherein the optical adhesive layer further includes a silane coupling agent, the silane coupling agent being present in an amount of about 0.01 to about 0.5 parts by weight, based on 100 parts by weight of the (meth)acrylic copolymer.

15. The optical member as claimed in claim 1 , wherein the transparent conductive film is a film or a grid electrode film including tin oxide, indium oxide, indium tin oxide, indium zinc oxide, indium zirconium oxide, zirconium oxide, fluorine tin oxide, zinc oxide, cadmium tin oxide, sulfur oxide, fluorine oxide, carbon black, carbon nanotube, platinum, gold, silver, palladium, electrically conductive polymer, or a mixture thereof.

16. The optical member as claimed in claim 1 , wherein the transparent conductive film is stacked on a glass substrate or a polyethylene terephthalate (PET) substrate.

17. An optical adhesive comprising a (meth)acrylic copolymer,
wherein the optical adhesive has an index of refraction from about 1.48 to about 1.50, as measured on a film having a thickness of about 10 μm to 50 μm,
wherein a surface resistance difference Rs 2 −Rs 1 of a specimen including the optical adhesive is less than about 0.2Ω, the specimen being prepared by manufacturing a polarizer plate having a cured product of the optical adhesive thereon and stacking two transparent conductive films on opposite upper sides of the cured product, where Rs 1 is an initial surface resistance of the specimen and Rs 2 is a surface resistance of the specimen kept at 70° C. and 95% RH for 48 hours, and
wherein the optical adhesive layer includes a (meth)acrylic copolymer, the (meth)acrylic copolymer including about 0.01 to about 30 wt % of repeating units of an aromatic ring containing vinyl monomer, an alicyclic ring containing vinyl monomer, a pyrrolidonyl group containing vinyl monomer, a furyl group containing monomer, or a mixture thereof.

18. A display apparatus comprising the optical member as claimed in claim 1 .

Assignees

• Jeong Woo Jin
• Lee Da Hee
• Kim Yi Eun
• Suh Yoo Jin
• Cheil Ind Inc

Inventors

• Jeong Woo Jin
• Lee Da Hee
• Kim Yi Eun
• Suh Yoo Jin

Classifications

• C09J133/06 Primary

  of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• Y10T428/1059

  Cross-Sectional Technologies · mapped topic

• Y10T428/1077

  Cross-Sectional Technologies · mapped topic

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• C09J133/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title