Backlight for liquid crystal display device

Abstract

A backlight of the present invention has a panel case and phosphor-coated anode section arranged in the panel case and linear cathode section. The linear cathode section has a conductive wire having carbon nano-wall formed on its outer peripheral surface. A field electron emitter emits electrons toward the phosphor-coated anode section so as to be radially widespread, when DC voltage is applied between the phosphor-coated anode section and the linear cathode section.

1 . A backlight for a liquid crystal display device that is a flat panel type for lighting the backside face of the liquid crystal display device, comprising: 
 a panel case provided with a flat panel section divided into plural light-emitting areas;    plural phosphor-coated anode sections each formed at the inner face of the flat panel section so as to correspond to each light-emitting area; and    plural linear cathode sections each arranged so as to be opposite to each of the plural phosphor-coated anode sections in the panel case, wherein    each of the plural linear cathode sections has a conductive wire arranged so as to extend linearly in the direction generally parallel to each of the plural phosphor-coated anode sections, and a field electron emitter formed on the outer peripheral surface of the conductive wire and including a carbon-based film, wherein    each field electron emitter of each of the plural linear cathode sections is provided so as to be capable of radially emitting electrons toward each of the plural light-emitting areas.    
     
     
         2 . A backlight for a liquid crystal display device of  claim 1 , wherein the carbon-based film is carbon nano-wall, and the conductive wire has a generally circular section, wherein the carbon nano-wall is film-formed with generally uniform thickness at the whole outer peripheral surface of the conductive wire so as to provide a high orientation.  
     
     
         3 . A backlight for a liquid crystal display device of  claim 2 , wherein the conductive wire has formed thereon a field concentration assisting concave/convex section.  
     
     
         4 . A backlight for a liquid crystal display device of  claim 1 , wherein the plural phosphor-coated anode sections are integrally formed.  
     
     
         5 . A backlight for a liquid crystal display device of  claim 1 , wherein electron reflection surfaces curved in a concave manner are provided with respect to each of the plural linear cathode sections at the position opposite to each of the plural phosphor-coated anode sections, and each of the plural linear cathode sections is arranged at each focal position of the plural electron reflection surfaces.  
     
     
         6 . A backlight for a liquid crystal display device of  claim 5 , wherein a half outer peripheral surface, that opposes to the phosphor-coated anode sections, of each conductive wire of the linear cathode sections is insulatingly covered, and the remaining half outer peripheral surface faces to the electron reflecting faces.  
     
     
         7 . A backlight for a liquid crystal display device of  claim 1 , wherein the plural linear cathode sections are integrally formed by spirally bending a single conductive wire in the panel case.  
     
     
         8 . A backlight for a liquid crystal display device of  claim 1 , wherein the plural linear cathode sections are arranged such that plural conductive wires independent of each other are opposed to each of the plural phosphor-coated anode sections.