Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing
Patent
1995-12-04
1998-10-20
Pascal, Robert
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Pulse storing
315370, 361150, H04N 929
Patent
active
058251316
ABSTRACT:
A tilt compensation circuit for a picture tube is provided to correct an image rotation phenomenon of a currently displayed image on a screen caused by an outer interference such as terrestrial magnetism. In the picture tube, an alternating current for driving the tube is applied to a power supply circuit for voltage conversion through an AC line filter and to a degaussing coil as well. The circuit includes a tilt adjustment circuit for comparing a tilt compensation control signal of a predetermined voltage level with a voltage feedback signal from the degaussing coil thereby generating current corresponding the difference therebetween. The circuit further includes a switching circuit responsive to a state of the tilt compensation control signal for selectively switching between a first circuit loop incorporating the AC line filter and the degaussing coil and a second loop incorporating the tilt adjustment circuit and the degaussing coil. The tilt compensation circuit alternatively performs either an operation of an electromagnetic field elimination or a tilt compensation operation. Accordingly, no additional tilt coil is required to add on existing apparatus but only using a degaussing coil for use with the tilt compensation circuit for a picture tube.
REFERENCES:
patent: 4908550 (1990-03-01), Chase et al.
patent: 5021712 (1991-06-01), Sands et al.
patent: 5170096 (1992-12-01), Kang et al.
patent: 5488270 (1996-01-01), Takita et al.
patent: 5499156 (1996-03-01), Bentley
patent: 5508588 (1996-04-01), Wu
Bettendorf Justin P.
Pascal Robert
Samsung Electronics Co,. Ltd.
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