| CPC G02B 5/3016 (2013.01) [C09J 163/10 (2013.01); G02B 5/30 (2013.01); C09J 2301/416 (2020.08); H01L 33/44 (2013.01); H10K 50/868 (2023.02)] | 15 Claims |
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1. A polarizing plate for light emitting displays, comprising: a polarizer; and
a first liquid crystal retardation film, a first bonding layer, and a second liquid crystal retardation film sequentially stacked on a surface of the polarizer, each of the first liquid crystal retardation film and the second liquid crystal retardation film being formed of a liquid crystal compound,
wherein the first bonding layer is directly formed on each of the first liquid crystal retardation film and the second liquid crystal retardation film,
wherein the first bonding layer has a glass transition temperature of about 70° C. to about 100° C. and is formed of a composition comprising:
an epoxy compound comprising at least one selected from among an alicyclic group-containing glycidyl ether and an aromatic group-containing glycidyl ether, the alicyclic group-containing glycidyl ether consisting of at least one selected from among 1,4-cyclohexane dimethanol diglycidyl ether, bis(4-hydroxycyclohexyl)methane diglycidyl ether, and 2,2-bis(4-hydroxycyclohexyl)-pro pane diglycidyl ether, and the aromatic group-containing glycidyl ether is resorcinol diglycidyl ether, and
a (meth)acrylate compound comprising a (meth)acrylate containing at least one hydroxyl group,
wherein the at least one selected from among the alicyclic group-containing glycidyl ether and the aromatic group-containing glycidyl ether is present in about 20 wt % to 75 wt % in the composition for the first bonding layer in terms of solid content, provided that the at least one selected from among the alicyclic group-containing glycidyl ether and the aromatic group-containing glycidyl ether is present in an amount of at least 33 wt % based on a total amount of the epoxy compound,
wherein the (meth)acrylate containing at least one hydroxyl group is present in an amount of about 5 parts by weight to about 20 parts by weight relative to a total of 100 parts by weight of the epoxy compound and the (meth)acrylate compound, and
wherein a peel strength of the first bonding layer with respect to each of the first liquid crystal retardation film and the second liquid crystal retardation film before the polarizing plate is left at 25° C. for 72 hours is about 100 gf/25 mm or more, and a peel strength of the first bonding layer with respect to each of the first liquid crystal retardation film and the second liquid crystal retardation film after the polarizing plate is left at 25° C. for 72 hours is about 200 gf/25 mm or more.
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