Electron leakage reduction in flat panel display devices
AssigneeRCA Corporation
InventorThomas L. Credelle
Life of this patent
Estimating the term…
Abstract
In a display device which is divided into a plurality of channels by support vanes, scanning electrodes are arranged on both sides of the vanes. The scanning electrodes are segmented in the direction of electron beam propagation and one portion of the segments is biased with a varying voltage to scan the electron beams transversely across the channels. The remaining portion of the scanning electrodes is biased to deflect leakage electrons away from the screen to thereby improve the visual display.
Claims9
In an electron display device having an evacuated envelope including a faceplate, a backplate and a side wall, a phosphor screen on said faceplate, a plurality of vanes dividing said envelope into a plurality of channels, means for providing at least one electron beam, means in each of said channels for propagating said electron beam longitudinally along said channels substantially parallel to said screen, means extending along said backplate for selectively directing said electron beam toward said screen, and scanning means on said vanes for scanning said electron beam transversely across said channels so that each channel contributes a portion of a visual display on said screen, an improvement wherein:
- said scanning means are electrode segments separated in the direction of said longitudinal electron beam propagation so that said electron beam sequentially propagates past said segments;
- and
- means for applying a varying voltage to a first portion of said segments to scan said electron beam transversely across said channels and means for applying a deflection voltage to a second portion of said segments to deflect leakage electrons away from said screen.
Dependencies are inferred from the claim text.