Blanking circuit having a pulse width extension part

Details Blanking circuit having a pulse width extension part Blanking circuit having a pulse width extension part

1997-10-29

1999-08-03

Westin, Edward P.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348637, H04N 324

Patent

active

059329777

ABSTRACT:
A blanking circuit generates a blanking signal by using a vertical fly-back pulse and/or an output signal of a vertical IC. The blanking signal is superimposed on a grid control signal obtained from a fly-back transformer and then provided to a grid control terminal of a CRT. The blanking circuit has an output signal stabilization part to generate a stable signal by restricting a peak value of a signal generated from the vertical IC within a predetermined limit, a pulse width extension part to widen a pulse width of a vertical fly-back pulse generated from the vertical IC and having a constant amplitude and a constant pulse width, and a blanking signal generating part to generate a blanking signal from the signal superimposing the stable signal on the vertical fly-back pulse having a wide pulse width. The blanking signal is superimposed on an output signal of a fly-back transformer and provided to a grid control terminal of the cathode ray tube. Thus, the blanking signal kills the retrace lines shown in upper and lower parts of a screen.

REFERENCES:
patent: 3950672 (1976-04-01), Fukaya et al.
patent: 4228464 (1980-10-01), Duijkers
patent: 4414574 (1983-11-01), Verlinden
patent: 4536793 (1985-08-01), Harshbarger et al.
patent: 4652920 (1987-03-01), Dietz
patent: 4767971 (1988-08-01), Onozawa et al.
patent: 5319287 (1994-06-01), Furukawa
patent: 5465032 (1995-11-01), Elgert et al.
patent: 5469220 (1995-11-01), Kumada
Japio Abstract Accession No. 03605679 & JP 030268579 (Sharp) Nov. 29, 1991.

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