US 4,308,486 A · Line cathode structure having recessed geometry

Abstract

A flat panel display device having a plurality of electron propagation channels utilizes a line cathode. The cathode extends across all the channels and modulation electrodes associated with the channels cause the cathode to emit the electrons into the spaces between parallel guide meshes within the propagation channels. The cathode and modulation electrodes are arranged in a recessed cavity in the proximity of launch electrodes so that the electrons are emitted at high velocity into the propagation channels to travel curved paths along which the electron beams are converged into the spaces between the guide meshes. Electron propagation structure within the channels, therefore, is displaced from the cathode so that the cathode heat has a substantially reduced effect on the propagation structure, and the high electron velocity minimizes the effect of mechanical tolerances on the electron beam.

Claims15

Dependent claims

A flat panel display device comprising

an evacuated envelope having a backwall and a plurality of channels extending along said backwall, guide means including spaced guide meshes arranged substantially parallel to said backwall for propagating electron beams along said channels in the space between said guide meshes;
electron gun means positioned to emit electrons to said space, said electron gun means including a line cathode arranged substantially normal to said channels and positioned in a cavity so that the longitudinal axis of said cathode is displaced from the plane containing said space to emit electrons into curved paths along which said beams are converged into said space.

Dependencies are inferred from the claim text.

Line cathode structure having recessed geometry

Life of this patent

Line cathode structure having recessed geometry

Life of this patent

Abstract

Claims15