Color display tube and device having such a tube

Abstract

A compact color display tube is provided in which a modulated electron beam enters a repelling trajectory control field, formed between a mesh electrode and a planar electrode, at an acute angle .alpha.. The beam follows a parabolic trajectory and approaches a target electrode bearing bands of phosphor stripes at substantially the same angle. The mesh electrode, comprising a plurality of parallel conductors, is disposed adjacent to the target electrode. The conductors of the mesh electrode extend parallel to the stripes and are spaced at a pitch corresponding to the pitch of the repeating bands of phosphor stripes. The target electrode is held at a potential such that the electron beam passing through the space between a pair of the conductors is focused and deflected onto a phosphor line of the target. A colored picture can be produced using a single electron beam by a spot wobbling technique or by scanning each phosphor line sequentially. In the case of a triple beam in-line electron gun, each beam has its own, slightly different trajectory and these trajectories coincide in the apertures of the mesh before impinging on their respective phosphors.

Dependencies are inferred from the claim text.