Resistive mesh structure for electroluminescent cell
AssigneeInternational Business Machines Corporation
InventorWebster E. Howard, Jr.
Life of this patent
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Abstract
A large-area electroluminescent (EL) faceplate for storage CRT is described. The EL faceplate has a non-planar mesh structure which includes individual current limiting resistance between a power source and an array of small-area active regions for improving the faceplate breakdown characteristics. The mesh, which comprises high conductivity strips and delivers power to the active regions, is substantially reduced in area relative to a simple conventional device, and is disposed on thick dielectric nonactive regions to further reduce the possibility of catastrophic breakdown.
Claims14
An array of electroluminescent cells for displaying data wherein each said electroluminescent (EL) cell includes a transparent conductor, a first insulator layer thereon, a layer of luminescent material on said first insulator layer, a second insulator layer applied to said luminescent material layer, a second conductive layer applied to said second insulator layer, said EL cell having the improvement comprising:
- each said EL cell having a substantially planar first region substantially parallel to said transparent conductor wherein luminance level is alterable, and a second region surrounding and substantially coplanar with said first region, said second region being nonluminous;
- and
- said luminescent material layer being continuous across said first and second regions;
- and
- said second conductive layer having a predetermined resistivity overlaying said second insulator layer to reduce damage to said luminescent layer due to defects in said EL cell structure.
An electroluminescent faceplate having an array of electroluminescent cells for displaying data wherein each said electroluminescent (EL) cell includes a transparent conductor, a first insulating layer thereon, a layer of luminescent material on said first insulator layer, a second insulator layer applied to said luminescent material layer, a second conductive layer applied to said second insulator layer, said EL cell having the improvement comprising:
- each said EL cell having a substantially planar first region substantially parallel to said transparent conductor wherein luminance level is alterable, and a second region surrounding and substantially coplanar with said first region, said second region being nonluminous;
- and
- said luminescent material layer being continuous across said first and second regions;
- and
- said second conductive layer having a predetermined resistivity overlaying said second insulator layer to reduce damage to the luminescent layer due to defects in said EL cell structure.
Dependencies are inferred from the claim text.