Invisible spacers for field emission displays

Details Invisible spacers for field emission displays Invisible spacers for field emission displays

1997-12-22

1999-04-13

O'Shea, Sandra

Electric lamp and discharge devices

With luminescent solid or liquid material

Vacuum-type tube

313495, 313238, 313292, 313309, 313336, 313351, 220445, H01J 162, H01J 6304, H01J 100, H01J 1900

Patent

active

058941940

ABSTRACT:
This invention provides a method of fabrication and structure for spacers between the anode substrate and the cathode substrate of a field emission display. The spacers have a high aspect ratio and which will be invisible to the human eye in the display image. An adhesive dielectric paste of glass frit in a binder is formed in cylindrical holes in a photoresist layer. Glass spacer spheres are placed on each column of dielectric paste. When fired the glass frit coalesces into a solid glass rod and bonds the glass spacer sphere to one end of the solid glass rod and the anode substrate to the other end of the solid glass rod. The firing also burns away the photoresist layer. The dark area in the image due to the spacers is less than 50 micrometers which will be invisible to the human eye.

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