Means for enhancing brightness of a monochrome CRT without loss

Details Means for enhancing brightness of a monochrome CRT without loss Means for enhancing brightness of a monochrome CRT without loss

1981-10-23

1984-09-04

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313415, H01J 2946, H01J 2956

Patent

active

044699875

ABSTRACT:
A high-resolution color television electron gun is disclosed for use in a high-brightness cathode ray tube having an unsegmented cathodoluminescent screen for producing a monochromatic image. The electron gun provides three horizontally oriented in-line beams lying in the deflection plane of the tube and converged into substantial coincidence on the screen. The diameters of the beams and hence resolution of the monochromatic image is inversely related to the magnitude of the beam currents. The gun includes associated cathode means and grid electrode means for forming each of the beams. A main focus lens for each of the beams includes at least a focusing electrode and an accelerating electrode for receiving a predetermined pattern of applied voltages for establishing beam-forming and accelerating electrostatic fields. The magnitude of the applied voltages are such that the beam currents are relatively low providing for small beam diameters and consequent high resolution. The brightness of the monochromatic image provided by the gun according to the invention is greater by approximately three times, without the loss of resolution, the brightness attained by a single-beam electron gun of equivalent beam current.

REFERENCES:
patent: 3286113 (1966-11-01), Benway
patent: 3696261 (1972-10-01), Miyaoka
patent: 3995194 (1976-11-01), Blacker, Jr. et al.
patent: 4177399 (1979-12-01), Muccigrosso et al.

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