Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1996-11-14
1999-01-05
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
G09G 104
Patent
active
058567291
ABSTRACT:
The present invention includes a DC signal generating circuit for generating a DC signal and a ramp signal generating circuit for generating a periodic ramp signal. A synthesizing circuit is then used to combine the DC signal and the ramp signal to generate a synthesized signal, where the DC level of the synthesized signal is determined by the DC level of the DC signal. A driving circuit is used to amplify the power of the synthesized signal. A rotate coil surrounding the neck of a cathode-ray tube is responsive to the amplified synthesized signal, and therefore generates a magnetic force to turn electron beam in the cathode-ray tube, thereby compensating the trapezoidal distortion on the bottom and the top edges of a screen display.
REFERENCES:
patent: 3992647 (1976-11-01), Yamada et al.
patent: 4296359 (1981-10-01), Dodds
patent: 5021712 (1991-06-01), Sands et al.
Issing Gregory C.
Mitac International Corp.
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