Polarizer, polarizing plate, and image display apparatus

Abstract

There is provided a polarizer that can realize the multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus. A polarizer according to an embodiment of the present invention includes a resin film containing a dichromatic substance, wherein the polarizer has a low dichromatic substance concentration portion whose content of the dichromatic substance is relatively low in the resin film. In the polarizer according to an embodiment of the present invention, the low dichromatic substance concentration portion has a content of an alkali metal and/or an alkaline earth metal of 3.6 wt % or less.

1 . A polarizer, comprising a resin film containing a dichromatic substance, the polarizer having, in the resin film, a low dichromatic substance concentration portion whose content of the dichromatic substance is relatively low,
 wherein the low dichromatic substance concentration portion has a content of an alkali metal and/or an alkaline earth metal of 3.6 wt % or less.   
     
     
         2 . The polarizer according to  claim 1 , wherein the low dichromatic substance concentration portion is formed by bringing a basic solution into contact with the resin film. 
     
     
         3 . The polarizer according to  claim 2 , wherein the basic solution comprises an aqueous solution containing a hydroxide of the alkali metal and/or the alkaline earth metal. 
     
     
         4 . The polarizer according to  claim 1 , wherein the low dichromatic substance concentration portion has a dichromatic substance content of 1.0 wt % or less. 
     
     
         5 . The polarizer according to  claim 1 , wherein the low dichromatic substance concentration portion has a transmittance of 50% or more. 
     
     
         6 . The polarizer according to  claim 1 , wherein the polarizer has a thickness of 30 μm or less. 
     
     
         7 . The polarizer according to  claim 1 , wherein the low dichromatic substance concentration portion corresponds to a camera portion of an image display apparatus on which the polarizer is mounted. 
     
     
         8 . A polarizing plate, comprising the polarizer of  claim 1 . 
     
     
         9 . An image display apparatus, comprising the polarizing plate of  claim 8 .