Color cathode ray tube display device and method of adjusting co

Details Color cathode ray tube display device and method of adjusting co Color cathode ray tube display device and method of adjusting co

1996-02-01

1998-09-01

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 10, 315370, G09G 128, G09G 104, H01J 3126

Patent

active

058014969

ABSTRACT:
A color cathode ray tube display device has a cathode ray tube 1, a convergence purity assembly 10 mounted on a neck portion 29 of the tube 1 at a position behind a deflection yoke 8, a two pole coil unit 12 near the convergence purity assembly 10 to form a two pole magnetic field, a purity coil 13 wound around a cathode ray tube panel 3, and current supplying circuits 15 for supplying currents each being in synchronism with a vertical or horizontal deflection current. It further has a distributing device which detects portions of mislanding on the picture plane by the aid of another device and analyzes a result of the detection, and current control circuits 16 for controlling the currents to the two pole coil unit 12 and the purity coil 13 in accordance with an instruction from the distributing device. Mislanding can be corrected by adjusting the currents to the two pole coil unit 12 and the purity coil 13 in addition to adjustment of a ring 103 of the convergence purity assembly 10 and adjustment of a mounted position of the deflection yoke 8. Quantities to be adjusted are indicated by the distributing device, and therefore, an adjusting work for ITC can be easy.

REFERENCES:
patent: 3668464 (1972-06-01), Tokita et al.
patent: 3725831 (1973-04-01), Barbin
patent: 3950671 (1976-04-01), Ichigaya et al.
patent: 4456853 (1984-06-01), Robinder et al.
patent: 4641062 (1987-02-01), Pons
IBM Technical Disclosure Bulletin, vol. 31, No. 12, May 1989.

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