Deflecting plate and liquid crystal display device

Abstract

The present invention provides a polarizer plate including at least a protective layer A, a polarizer, and a protective layer B in that order, the protective layer A including at least layers a and b respectively including a thermoplastic resin as a main component, the layer a having a flexural modulus higher than that of the layer b; and a liquid crystal display device including a light source, an incident-side polarizer plate, a liquid crystal cell, and an exit-side polarizer plate in that order, the incident-side polarizer plate and/or the exit-side polarizer plate being the polarizer plate of the present invention. According to the present invention, a polarizer plate exhibiting high tenacity and high surface hardness and a liquid crystal display device including the polarizer plate are provided.

1 . A polarizer plate comprising at least a protective layer A, a polarizer, and a protective layer B in that order,
 the protective layer A including at least layers a and b respectively including a thermoplastic resin as a main component,   the layer a being formed of at least one kind of resin selected from the group consisting of a vinyl aromatic polymer, a polyacrylonitrile polymer, a vinyl alicyclic hydrocarbon polymer, and a hydrogenated product thereof, and   the flexural modulus of layer a being higher than the flexural modulus of layer b.   
     
     
         2 . The polarizer plate according to  claim 1 , wherein the protective layer A has a water vapor transmission rate of 10 g/day·m 2  or less. 
     
     
         3 . The polarizer plate according to  claim 1 , wherein the protective layer A is obtained by coextrusion. 
     
     
         4 . The polarizer plate according to  claim 1 , wherein the layer a has a flexural modulus of 3 GPa to 4 GPa. 
     
     
         5 . The polarizer plate according to  claim 1 , wherein the layer b has a flexural modulus of 0.1 GPa to 3 GPa. 
     
     
         6 . The polarizer plate according to  claim 1 , wherein a difference in flexural modulus between the layers a and b is 0.2 GPa to 2.5 Gpa. 
     
     
         7 . The polarizer plate according to  claim 1 , wherein the protective layer B is a layer exhibiting birefringence. 
     
     
         8 . The polarizer plate according to  claim 1 , wherein the layer b is provided adjacent to the polarizer. 
     
     
         9 . A liquid crystal display device comprising a light source, an incident-side polarizer plate, a liquid crystal cell, and an exit-side polarizer plate in that order, wherein the incident-side polarizer plate and/or the exit-side polarizer plate is the polarizer plate according to  claim 1 . 
     
     
         10 . A liquid crystal display device comprising a light source, an incident-side polarizer plate, a liquid crystal cell, and an exit-side polarizer plate in that order, wherein the exit-side polarizer plate is the polarizer plate according to  claim 1 . 
     
     
         11 . A liquid crystal display device comprising a light source, an incident-side polarizer plate, a liquid crystal cell, and an exit-side polarizer plate in that order, wherein the incident-side polarizer plate and/or the exit-side polarizer plate is the polarizer plate according to  claim 1 , and wherein the polarizer plate is disposed so that the layer a does not face the liquid crystal cell.