Polarizing plate and display device

Abstract

A polarizing plate including a polarizer and a substrate film, wherein the polarizing plate is a product obtained by stretching a layered body, the layered body includes a polarizer material film and an unstretched substrate film, the polarizer material film is a film obtained by stretching a primary film, the polarizer includes a dichroic material and has a thickness T of 20 μm or less, and a phase difference Re in an in-plane direction of the substrate film in the polarizing plate is 20 nm or less. Preferably, the layered body further includes an adhesive layer that is provided between the polarizer material film and the unstretched substrate film.

1 . A polarizing plate comprising a polarizer and a substrate film, wherein
 the polarizing plate is a product obtained by stretching a layered body,   the layered body includes a polarizer material film and an unstretched substrate film,   the polarizer material film is a film obtained by stretching a primary film,   the polarizer includes a dichroic material and has a thickness T of 20 μm or less, and   a phase difference Re in an in-plane direction of the substrate film in the polarizing plate is 20 nm or less.   
     
     
         2 . The polarizing plate according to  claim 1 , wherein the layered body further includes an adhesive layer that is provided between the polarizer material film and the unstretched substrate film. 
     
     
         3 . The polarizing plate according to  claim 1 , wherein the substrate film is a film layer formed of at least one type selected from a cycloolefin resin, an amorphous polyester resin, a polyolefin resin, and an acrylic resin. 
     
     
         4 . The polarizing plate according to  claim 1 , wherein
 the substrate film is a film formed of a cycloolefin resin,   the cycloolefin resin contains a cycloolefin-based polymer, and   the cycloolefin-based polymer is formed of at least one type selected from a hydrogenated product of a ring opening polymer of a norbornene-based monomer, an addition copolymer of a norbornene-based monomer and an α-olefin, and a hydrogenated product thereof.   
     
     
         5 . The polarizing plate according to  claim 1 , wherein
 the substrate film is a film formed of a cycloolefin resin,   the cycloolefin resin contains a cycloolefin-based polymer, and   the cycloolefin-based polymer is composed of a hydrogenated product of a block copolymer obtained by hydrogenating a block copolymer [D] composed of:   a polymer block [A] containing a repeating unit [I] derived from an aromatic vinyl compound as a main component; and   a polymer block [B] containing the repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound as a main component or a polymer block [C] containing the repeating unit [II] derived from a chain conjugated diene compound as a main component.   
     
     
         6 . The polarizing plate according to  claim 1 , wherein the substrate film contains a plasticizer and/or a softener. 
     
     
         7 . The polarizing plate according to  claim 6 , wherein the plasticizer and/or softener is one or more types selected from an ester-based plasticizer and an aliphatic hydrocarbon polymer. 
     
     
         8 . The polarizing plate according to  claim 1 , comprising a protective film or a tackiness agent layer on one surface of the polarizer. 
     
     
         9 . The polarizing plate according to  claim 8 , wherein the protective film is formed of a cycloolefin resin, an acrylic resin, a polyethylene terephthalate resin, or a triacetyl cellulose resin. 
     
     
         10 . A display device comprising:
 two substrates;   a liquid crystal layer positioned therebetween; and   the polarizing plate according to  claim 1  disposed on at least one of outer sides of the two substrates.   
     
     
         11 . A display device comprising:
 two substrates;   a light-emitting layer positioned therebetween; and   the polarizing plate according to  claim 1  disposed outside one of the two substrates.   
     
     
         12 . The display device according to  claim 10 , wherein the substrate film is disposed between the polarizer and the liquid crystal layer. 
     
     
         13 . The display device according to  claim 11 , wherein the substrate film is disposed between the polarizer and the light-emitting layer.