Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1992-05-12
1993-06-22
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Plural concentrating, accelerating, and/or de-accelerating...
315383, 313447, 313451, H01J 2946, H01J 2956
Patent
active
052218759
ABSTRACT:
The present invention includes a cathode-ray tube (10) capable of providing a high-brightness, high-resolution large screen display that is compatible with, for example, field sequential liquid crystal color display systems and monochrome imaging systems. Preferably, the tube includes a small-diameter cathode assembly (14 of 110) with an adjacent small-diameter control grid electrode (38 or 114). The small diameters of the cathode assembly and the control grid electrode result in relatively little capacitance and are, therefore, compatible with relatively high video signal bandwidths. A thick accelerating electrode (66 or 150) is positioned adjacent the control grid electrode to prefocus the electron beam and, thereby, form it with relatively low spherical aberration. In a preferred embodiment, the electron beam is modulated in a push-pull manner by applying a video modulation signal and its inverse to the cathode and the control grid electrode.
REFERENCES:
patent: 4500809 (1985-02-01), Odenthal et al.
patent: 4651064 (1987-03-01), Parker et al.
patent: 4973890 (1990-11-01), Desjardins
patent: 4977348 (1990-12-01), Odenthal
patent: 5028838 (1991-07-01), Askew et al.
patent: 5077498 (1991-12-01), Odenthal
Blum Theodore M.
Meininger Mark M.
Tektronix Inc.
Winkelman John D.
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