Active shadow mask color CRT

Details Active shadow mask color CRT Active shadow mask color CRT

1988-12-09

1989-11-14

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 66, H01J 2980

Patent

active

048810169

ABSTRACT:
In a color cathode ray tube, a single selectron beam is deflected through a deflection yoke and passes through a collimation lens to an active shadow mask formed with a plurality of apertures to divide the beam into a plurality of segments. Each beam segment is intensity modulated at the entrance of its aperture through modulating electrodes which focus the electrons in the beams at crossover points within the apertures. Lens electrodes at the exits of the apertures restore travel of the electrons to parallel paths approaching a three color phosphor screen. The distance between corresponding modulating and lens electrodes at the entrance and exit of each aperture is approximately equal to the sum of the focal lengths thereof for restoring said electron travel to the parallel paths and thereby correctively regulating display of multi-color information on the screen corresponding to the input modulating voltage signals applied to the modulating electrodes.

REFERENCES:
patent: 2862141 (1958-11-01), Kruper et al.
patent: 3315027 (1967-04-01), Winge

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