Flat type cathode ray tube

Details Flat type cathode ray tube Flat type cathode ray tube

1985-03-06

1986-11-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313422, H01J 2970, H01J 2972

Patent

active

046224971

ABSTRACT:
In a flat type cathode ray tube having a small depth relative to an image screen size, electron beams which are generated by heating vertically extending linear thermal cathodes are sequentially and vertically switched by a plurality of vertical scanning electrodes extending vertically and arranged perpendicularly to the linear thermal cathodes, are transmitted through an electron beam generating electrode having apertures formed therein corresponding to the linear thermal cathodes. The electron beams are horizontally deflected by horizontal deflection electrodes, and then directed to a phosphor layer on an image area of a faceplate. The electron beams are modulated by applying a modulation pulse voltage together with a heating D.C. voltage to the linear thermal cathodes, or by applying a modulation pulse signal to a modulation electrode arranged close to the electron beam generating electrode. A large image screen size is attained by the provision of the plurality of vertically extending linear thermal cathodes.

REFERENCES:
patent: 4118650 (1978-10-01), Scott
patent: 4158210 (1979-06-01), Watanabe et al.
patent: 4417184 (1983-11-01), Takesako et al.
patent: 4449148 (1984-05-01), Inohara et al.

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