Abstract: For use in a luminescent display panel or the like, an extended-area, cellular spacer-support comprising a stack of mutually registered open lattices of filaments adhered together to form a latticework defining an array of narrow transverse openings therethrough which serve in the panel as radiation or particle passageways.

Abstract: A novel structural combination for use in gas discharge panels for generating alpha-numeric and video images which exhibit a high level of brightness, even in panels scanned in a point-at-a-time mode and at television scan rates. The combination includes row-wise extending hollow cathodes comprising upper and lower metal cathode plates between which a hollow cathode discharge is generated. The spacing between cathode plates is selected to insure that an efficient hollow cathode discharge is created. Situated forward of the hollow cathodes are a first electrontransmissive grid means for extracting electrons from the hollow cathode dischage, a second electron-transmissive grid means for controlling the flow of electrons through the first and second grid means, and a faceplate having a phosphor coating thereon and adapted to receive an energizing potential for accelerating toward the phosphor coating those electrons which pass through the second grid means.