Color cathode ray tube display device and method of eliminating

Details Color cathode ray tube display device and method of eliminating Color cathode ray tube display device and method of eliminating

1996-03-07

1997-06-24

Lee, Michael H.

Television

Video display

Cathode-ray tube

315 8, 315370, 348820, 361150, H04N 929, H01J 2906

Patent

active

056421753

ABSTRACT:
A color cathode ray tube display device comprises a color cathode ray tube including a neck portion (1a), a funnel portion (1b), and a panel portion (1c), a compensating coil (7) which generates a compensating magnetic field for eliminating the influence of an external magnetic field that acts vertically on electron beams which will intersect a display screen of the color cathode ray tube (1), a current supply unit (4,5) for passing a sawtooth current synchronized with the vertical deflection cycle of a video signal into the compensating coil (7) so that the compensating coil generates the compensating magnetic field, and a memory (5b) for storing information about the sawtooth current passing through the compensating coil (7).

REFERENCES:
patent: 5367221 (1994-11-01), Santy et al.
patent: 5488270 (1996-01-01), Takita et al.
patent: 5493179 (1996-02-01), Tanizoe

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