CRT display apparatus, field radiation restriction circuit and f

Details CRT display apparatus, field radiation restriction circuit and f CRT display apparatus, field radiation restriction circuit and f

1996-08-20

1999-06-22

Kinkead, Arnold

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

31536818, 315370, 315 8, H04N 929

Patent

active

059145676

ABSTRACT:
A display apparatus including a CRT having a deflection yoke, a plurality of field radiation restriction electrodes and a field radiation restriction circuit including an amplitude adjuster for applying, to at least one of the field radiation restriction electrodes, pulse voltage having polarity in reverse to the polarity of pulse voltage to be applied to the deflection yoke and a differential waveform adjuster for applying, to at least another field radiation restriction electrode, pulse voltage obtained by differentiating the pulse voltage to be applied to the deflection yoke. The plural field radiation restriction electrodes are provided; voltage having the polarity in reverse to that of the pulse voltage to be applied to the deflection yoke is applied to at least one of the plural field radiation restriction electrodes; and voltage obtained by differentiating the pulse voltage to be applied to the deflection yoke is applied to at least another field radiation restriction electrode so as to cancel an electric field radiated from the tube surface of the CRT.

REFERENCES:
patent: 5404084 (1995-04-01), Onodera et al.
patent: 5475287 (1995-12-01), Okuyama et al.

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