Automatic image rotation compensation circuit and method

Details Automatic image rotation compensation circuit and method Automatic image rotation compensation circuit and method

1997-05-02

1998-12-08

Pascal, Robert J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315 85, 315370, H01J 2906

Patent

active

058475117

ABSTRACT:
An automatic image rotation compensation circuit includes: a terrestrial magnetic field detecting unit for detecting horizontal and vertical terrestrial magnetic fields of a place where a display device is installed; an amplifying unit for amplifying the horizontal and vertical terrestrial magnetic field values detected by the terrestrial magnetic field detecting unit; an analog-to-digital converting unit for converting the analog terrestrial magnetic field values amplified by the amplifying unit into digital signals; a memory for storing image compensation reference values corresponding to various terrestrial magnetic field values; a microcomputer for receiving the digital terrestrial magnetic field values from the analog-to-digital converting unit and reading compensation values corresponding to the terrestrial magnetic field values; a digital-to-analog converting unit for converting the digital signals from the microcomputer into analog signals; and a deflection controller for performing a differential amplification on the signals transmitted from the digital-to-analog converting unit and changing a current flowing through rotation coils to control a tilt.

REFERENCES:
patent: 4899082 (1990-02-01), Sands et al.
patent: 4950955 (1990-08-01), Hoover et al.
patent: 4963789 (1990-10-01), Buhler
patent: 5179315 (1993-01-01), Lonoce et al.
patent: 5223768 (1993-06-01), Izawa et al.

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