Substrate having fluorescent member, image display apparatus and image receiving and displaying apparatus

Abstract

A substrate having a fluorescent member arranged on a pixel area in a plane of a surface of the substrate, wherein the fluorescent member emits light by an irradiation with an electron and comprises a first fluorescent member having a larger gamma value and arranged in the pixel area, and a second fluorescent member having a smaller gamma value and arranged at a peripheral of the first fluorescent member within the pixel area.

1 . A substrate having a fluorescent member arranged on a pixel area in a plane of a surface of the substrate, wherein 
 the fluorescent member emits light by an irradiation with an electron and comprises a first fluorescent member having a larger gamma value and arranged in the pixel area, and a second fluorescent member having a smaller gamma value and arranged at a peripheral of the first fluorescent member within the pixel area.    
   
   
       2 . The substrate according to  claim 1 , wherein 
 the first fluorescent member is arranged at a center of the pixel area.    
   
   
       3 . The substrate according to  claim 1 , wherein 
 the first fluorescent member is arranged in a circular or elliptic area covering a center of the pixel area.    
   
   
       4 . The substrate according to  claim 1 , wherein 
 the first fluorescent member is arranged in a square or rectangular area covering a center of the pixel area.    
   
   
       5 . The substrate according to  claim 1 , wherein 
 the first fluorescent member is formed from a material defined by a general formula: SrGa 2 S 4 :Eu, and    the second fluorescent member is formed from a material defined by a general formula: ZnS:Cu,Al or ZnS:Cu,Au,Al.    
   
   
       6 . The substrate according to  claim 1 , wherein 
 the first fluorescent member is formed from a material defined by a general formula: CaMgSi 2 O 6 :Eu, and    the second fluorescent member is formed from a material defined by a general formula: ZnS:Ag,Cl or ZnS:Ag,Al.    
   
   
       7 . an image display apparatus comprising: 
 the substrate according to  claim 1 , and    a rear substrate provided with an electron-emitting device disposed in opposition to the substrate according to  claim 1 .    
   
   
       8 . The image display apparatus according to  claim 7 , wherein 
 the electron-emitting device is a surface conduction type one.    
   
   
       9 . An image receiving and display apparatus comprising 
 the image display apparatus according to  claim 7;  a receiving circuit for receiving selectively a video signal; and    an output circuit for producing an image signal to be outputted to the image display apparatus based on the video signal received by the receiving circuit.    
   
   
       10 . A substrate having a fluorescent member disposed thereon, 
 the fluorescent member comprising first and second fluorescent members emitting light by an electron irradiation, the first fluorescent member emits light of higher luminance by the electron irradiation of a first density than light emitted by the second fluorescent member by the electron irradiation of the first density, while the second fluorescent member emits light of higher luminance by the electron irradiation of a second density than light emitted by the first fluorescent member by the electron irradiation of the second density,    wherein the first density is smaller than the second density, and    wherein the first fluorescent member is disposed on the substrate at a position corresponding to the electron irradiation of the first density, while the second fluorescent member is disposed on the substrate at a position corresponding to the electron irradiation of the second density.