Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1997-10-20
1999-11-23
Day, Michael
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313497, H01J 3112
Patent
active
059906090
ABSTRACT:
A display device includes a cathode for emitting electrons and a permanent magnet. A two dimensional array of channels extends between opposite poles of the magnet. The magnet generates, in each channel, a magnetic field for forming electrons from the cathode into an electron beam. A screen receives an electron beam from each channel. The screen has a phosphor coating facing the side of the magnet remote from the cathode. The phosphor coating comprises a plurality of pixels each corresponding to a different channel. A grid electrode is disposed between the cathode and the magnet for controlling flow of electrons from the cathode into each channel. A deflection sequentially addresses the electron beam from each channel to each pixel of the corresponding group. Rotational alignment APPARATUS aligns electron beams from the channels with corresponding pixels of the phosphor coating. The rotational alignment comprises a resistive deflector and apparatus for generating a differential voltage across one or more elements of the deflector. The magnitude and direction of the differential voltage across one or more elements of the deflector is used to provide rotational alignment.
REFERENCES:
patent: 4339688 (1982-07-01), Verweel
patent: 4758728 (1988-07-01), Matey et al.
patent: 5747923 (1998-05-01), Beeteson et al.
patent: 5801485 (1998-09-01), Van Veen et al.
patent: 5859508 (1999-01-01), Ge et al.
patent: 5861712 (1999-01-01), Beetson et al.
Beeteson John
Knox Andrew Ramsay
Day Michael
International Business Machines - Corporation
McKinley Martin J.
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