Scan loss detector for cathode ray tube

Details Scan loss detector for cathode ray tube Scan loss detector for cathode ray tube

1991-05-17

1992-05-05

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

G09G 104, H01J 2970

Patent

active

051111195

ABSTRACT:
An active amplifier is responsive to a vertical parabola voltage developed across a trace or S-shaping capacitor for developing a DC voltage at an increased voltage level than can be obtained by rectifying the parabola voltage. The increased voltage level is developed in a capacitor, during part of the period of each scan. The capacitor is discharged through a parallel resistor. During normal scanning, the capacitor voltage, alternately, increases and decreases, but remains above a threshold level as detected by a comparator. Upon scan loss, the capacitor discharges below the threshold and the comparator triggers blanking of the kinescope driver. In this way, the phosphors of a cathode ray tube of a television, especially a projection television, are protected from burning due to a loss of electron beam deflection.

REFERENCES:
patent: 3963961 (1976-06-01), Ray et al.
patent: 5036260 (1991-07-01), George
U.S. patent application, Ser. No. 516,386 entitled Self Biasing Protection Arrangement For A Cathode Ray Tube, in the name of John Barrett George.

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