Switching circuit for television receiver on-screen display
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United States of America Patent
Stats
-
Oct 25, 1983
Grant Date -
N/A
app pub date -
Nov 20, 1981
filing date -
Nov 20, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Auxiliary graphics information signals to be displayed by the kinescope of a television receiver during on-screen display intervals are applied to the kinescope via a video signal coupling path of the receiver by means of a gated transistor and a differentially controlled current steering switch which are controlled by graphics timing signals. A current source for the current steering switch supplies an operating current for the video path when normal video signals are to be displayed, operating current for the gated transistor when graphics signals of a color other than black are to be displayed, and operating current for blanking the video path to produce a black graphics display.
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Family
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Cited Art Landscape
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