Deflection correction

Details Deflection correction Deflection correction

1995-10-23

1996-12-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348806, H01J 2956

Patent

active

055834000

ABSTRACT:
In the market, there is a tendency towards picture tubes with a super flat screen. Due to the flat screen, it is becoming increasingly difficult to meet the even tighter specification on North/South raster distortion (N/S distortion), the tighter specification being caused by a growing importance of text display and high resolution displays. A deflection correction circuit is provided which compensates for a N/S distortion by inducing a correction current (Icv) through a vertical deflection coil (Lv). The correction current (Icv) can be injected in the vertical deflection coil (Lv) via an injection transformer (Ti) coupled in series with the vertical deflection coil (Lv). The injection transformer (Ti) is driven via an output stage (3) by a waveform generator (1,2). The waveform generator (1,2) generates a voltage waveform (M) built up out of substantially straight line sections. The deflection coil (Lv) integrates the voltage waveform (M) into a current waveform (Icv) having substantially parabolic sections. Such an inexpensive and flexible deflection correction circuit can be used to compensate for top/bottom and/or seagull N/S distortion, or for correction of convergence distortions. The deflection correction circuit can be a discrete or an integrated circuit.

REFERENCES:
patent: 4668897 (1987-05-01), Haferl
patent: 4682085 (1987-07-01), Haferl et al.
patent: 4687972 (1987-08-01), Haferl
patent: 4845409 (1989-07-01), Oliver
patent: 4961030 (1990-10-01), Ogino et al.
patent: 5034664 (1991-07-01), Fernsler et al.
patent: 5111120 (1992-05-01), Haferl

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