Electromagnetic wave shielding laminate and display device employing it

Abstract

An electromagnetic wave shielding laminate comprising a transparent substrate and an electromagnetic wave shielding film formed thereon, characterized in that the electromagnetic wave shielding film has, sequentially from the substrate side, a first high refractive index layer made of a material having a refractive index of at least 2.0, a first oxide layer containing zinc oxide as the main component, an electroconductive layer containing silver as the main component, and a second high refractive index layer made of a material having a refractive index of at least 2.0.

1 . An electromagnetic wave shielding laminate comprising a transparent substrate and an electromagnetic wave shielding film formed thereon, characterized in that the electromagnetic wave shielding film has, sequentially from the substrate side, a first high refractive index layer made of a material having a refractive index of at least 2.0, a first oxide layer containing zinc oxide as the main component, an electroconductive layer containing silver as the main component, and a second high refractive index layer made of a material having a refractive index of at least 2.0.  
     
     
         2 . The electromagnetic wave shielding laminate according to  claim 1 , wherein the electromagnetic wave shielding film has a second oxide layer between the electroconductive layer and the second high refractive index layer.  
     
     
         3 . The electromagnetic wave shielding laminate according to  claim 1  or  2 , wherein the first or second high refractive index layer is a layer containing niobium oxide as the main component.  
     
     
         4 . The electromagnetic wave shielding laminate according to  claim 1 ,  2  or  3 , wherein the content of silver in the electroconductive layer is at least 99.8 atomic %.  
     
     
         5 . The electromagnetic wave shielding laminate according to any one of  claims 2  to  4 , wherein the second oxide layer is an oxide layer containing zinc oxide as the main component.  
     
     
         6 . The electromagnetic wave shielding laminate according to any one of  claims 1  to  5 , wherein at least three such electromagnetic wave shielding films are laminated from the substrate side.  
     
     
         7 . An electromagnetic wave shielding laminate comprising a transparent substrate and at least two electromagnetic wave shielding films laminated thereon, characterized in that each electromagnetic wave shielding film has, sequentially from the substrate side, a first high refractive index layer made of a material having a refractive index of at least 2.0, a first oxide layer containing zinc oxide as the main component, an electroconductive layer containing silver as the main component, and a second high refractive index layer made of a material having a refractive index of at least 2.0, and the first high refractive index layer and the second high refractive index layer which are in direct contact each other between the electromagnetic wave shielding films, are made of a single layer formed all together.  
     
     
         8 . The electromagnetic wave shielding laminate according to  claim 7 , wherein each electromagnetic wave shielding film has a second oxide layer between the electroconductive layer and the second high refractive index layer.  
     
     
         9 . The electromagnetic wave shielding laminate according to  claim 7  or  8 , wherein the first or second high refractive index layer is a layer containing niobium oxide as the main component.  
     
     
         10 . A display device characterized by comprising a display screen to display images and an electromagnetic wave shielding laminate as defined in any one of  claims 1  to  9 , provided on the viewer's side of the display screen.