Display devices

A display device comprising a screen;

• a back plate sealed to the screen to form an evacuated chamber;
• area cathode means disposed between the back plate and the screen;
• a permanent magnet disposed between the cathode and the screen;
• a two dimensional array of rows and columns of channels extending between opposite poles of the magnet for receiving electrons from the cathode;
• an anode phosphor layer disposed between the screen and the magnet for receiving electrons from the channels;
• grid electrode means disposed between the area cathode means and the magnet for controlling flow of electrons from the cathode means into the channels;
• anode means disposed between the magnet and the anode phosphor layer for controlling flow of electrons from the channels towards the screen;
• and a plurality of spacers disposed between the screen and the magnet for spacing the screen from the magnet, each spacer comprising an elongate body having a larger cross sectional area at one end of the spacer tapering to a smaller cross sectional area at the other end of the spacer.

A display device comprising:

• a screen;
• a back plate sealed to the screen to form an evacuated chamber;
• area cathode means disposed between the back plate and the screen;
• a permanent magnet disposed between the cathode and the screen;
• a two dimensional array of rows and columns of channels extending between opposite poles of the magnet for receiving electrons from the cathode;
• a phosphor layer disposed between.screen and the magnet for receiving electrons from the channels;
• grid electrode means disposed between the area cathode means and the magnet for controlling flow of electrons from the cathode means into the channels;
• anode means disposed between the magnet and the anode phosphor layer for controlling flow of electrons from the channels towards the screen;
• and a plurality of spacers for spacing the magnet from the cathode, the spacers being disposed within recesses formed in the grid electrode means.

A display device comprising:

• a screen;
• area cathode apparatus sealed to the screen to form an evacuated chamber, wherein the area cathode apparatus comprises a back plate, silica glass substrate peripherally sealed to the back plate to produce the chamber, a gas contained in the chamber, a layer of photo-sensitive material disposed on the surface of the substrate external to the chamber, a cathode phosphor layer disposed between the back plate and the substrate, and a pair of electrode facing each other from opposite sides of the chamber for energizing the gas to generate a plasma for exciting the cathode phosphor layer to generate light energy for producing electron emissions from the photo-sensitive material;
• a permanent magnet disposed between the area cathode apparatus and the screen;
• a two dimensional array of rows and columns of channels extending between opposite poles of the magnet for receiving electrons from the area cathode apparatus;
• an anode phosphor layer disposed between the screen and the magnet for receiving electrons from the channels;
• grid electrode means disposed between the area cathode apparatus and the magnet for controlling flow of electrons from the area cathode apparatus into the channels;
• and anode means disposed between the magnet and the anode phosphor layer for controlling flow of electrons from the channels towards the screen.