Gas discharge display device with at least one spacing frame which limits the post-acceleration chamber

In a gas discharge display device having a gas-filled, gas-tight space, said space defined by spaced parallel front and back plates, said device having a control disc disposed in said gas-filled space parallel to said front and back plates dividing said gas-filled space into a gas discharge chamber between said back plate and said control disc and a post-acceleration space between said front plate and said control disc, said control disc having a plurality of row conductors on one side thereof and a plurality of column conductors on an opposite side thereof and being perforated at points of intersection of said row and column conductors, said front plate having a luminescent screen thereon with an anode layer and said back plate having at least one cathode, the improvement of:

• at least one spacing frame surrounding said post-acceleration chamber and defining a lateral boundary thereof at an interior of said spacing frame,
• said interior of said spacing frame being substantially coincident with the boundary of an active portion of said luminescent screen,
• said spacing frame being attached by a sealing material to said control disc and said back plate in an air tight fashion, and said spacing frame having a width such that said sealing material when applied externally does not penetrate said post-acceleration chamber, said spacing frame further separating portions of said anode layer on said front plate and portions of said conductors on said control disc at edge regions of said post-acceleration chamber adjacent to said spacing frame.