Blanking circuit having a pulse width extension part
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United States of America Patent
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-
Aug 3, 1999
Grant Date -
N/A
app pub date -
Oct 29, 1997
filing date -
Oct 29, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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