Degaussing system for cathode ray tube which prevents display of

Details Degaussing system for cathode ray tube which prevents display of Degaussing system for cathode ray tube which prevents display of

1996-01-04

1998-04-21

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

361150, H04N 929

Patent

active

057421277

ABSTRACT:
A system for degaussing a cathode ray tube (CRT) which avoids displaying a distorted picture to the user when a magnetic field is degaussed while the CRT is on. The system of the present invention recognizes when a user has pressed a button to initiate the manual degaussing operation, controls the brightness and contrast of the CRT so that the displayed picture becomes black, degausses the CRT while the picture appears black, and controls the brightness and contrast of the CRT to levels present before degaussing.

REFERENCES:
patent: 4445072 (1984-04-01), Fredes
patent: 4458178 (1984-07-01), Tenney et al.
patent: 4636911 (1987-01-01), Truskalo
patent: 5475283 (1995-12-01), Yoshida
patent: 5499156 (1996-03-01), Bentley

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