Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1992-05-20
1993-01-26
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Plural concentrating, accelerating, and/or de-accelerating...
313414, H01J 2946, H01J 2956
Patent
active
051824922
ABSTRACT:
Energetic electrons emitted by heated cathodes in a multi-beam color cathode ray tube (CRT) are directed to a low voltage beam forming region (BFR) of an electron gun, with the thus formed electron beams then directed through a high voltage main focus lens for focusing the beams on a display screen of the CRT. The BFR includes a G.sub.2 electron having three spaced inline apertures each disposed within an essentially electrostatic field-free region and through each of which a respective electron beam passes. Each G.sub.2 aperture intercepts an outer portion of an associated electron beam to provide an electron beam cross sectional shape which compensates for the asymmetric focusing effect of the main focus lens in correcting for beam spherical aberration to provide a rotationally symmetric electron beam spot on the display screen. The invention is also adapted for use in a monochrome, single electron beam CRT to provide a desired electron beam spot shape for optimum display pixel density and/or to eliminate display discontinuities and provide a smooth video image display.
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Blum Theodore M.
Chunghwa Picture Tubes Ltd.
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