Penetron color display tube with channel plate electron multiplier

A penetron color display tube comprising:

• (a) means for producing a low energy electron beam;
• (b) a luminescent screen including repetitive groups of phosphor elements for luminescing in different colors;
• (c) a channel plate electron multiplier disposed between the beam producing means and the screen, said multiplier including a plurality of channels each having an input end for receiving the low energy electron beam and an output end for emitting a higher energy electron beam toward a respective one of said groups of phosphor elements;
• and
• (d) means for selectively directing the low energy electron beam toward the input ends of the channels in the channel plate electron multiplier;
• characterized in that:
• (1) each group of phosphor elements includes a central phosphor element and a surrounding annular phosphor element, one of said elements comprising a single layer of phosphor material and the other phosphor element comprising first and second layers of phosphor material, each layer luminescing in a respective color when excited by an electron beam;
• and
• (2) said channel plate electron multiplier includes, at the output end of each channel, electrode means for selectively focusing the electron beam emitted thereby to impinge on either said central phosphor element or said annular phosphor element in the group toward which the beam is emitted, and accelerating means for selectively accelerating said emitted electron beam to any one of predefined energy levels for effecting excitation of a respective one of the layers in said group.

A penetron color display tube comprising:

• (a) means for producing a low energy electron beam;
• (b) a luminescent screen including repetitive groups of phosphor elements for luminescing in different colors;
• (c) a channel plate electron multiplier disposed between the beam producing means and the screen, said multiplier including a plurality of channels each having an input end for receiving the low energy electron beam and an output end for emitting a higher energy electron beam toward a respective one of said groups of phosphor elements;
• and
• (d) means for selectively directing the low energy electron beam toward the input ends of the channels in the channel plate electron multiplier;
• characterized in that:
• (1) each group of phosphor elements includes a strip-shaped first phosphor element comprising a single layer of phosphor material and an adjacent strip-shaped second phosphor element comprising first and second layers of phosphor material, each layer luminescing in a respective color when excited by an electron beam;
• and
• (2) said channel plate electron multiplier includes, at the output end of each channel, electrode means for selectively directing the electron beam emitted thereby toward either said first phosphor element or said second phosphor element in the group toward which the beam is emitted, and accelerating means for selectively accelerating said emitted electron beam to any one of predefined energy levels for effecting excitation of a respective one of the layers in said group.