Method and apparatus for detection of a video display device
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United States of America Patent
Stats
-
Nov 16, 2004
Grant Date -
Jan 17, 2002
app pub date -
Jan 28, 1999
filing date -
Jan 28, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for detecting the presence of a display device at the output of a video driver utilizes a terminating resistance connected between the output of the video driver and a ground level. A current is driven by the video driver, resulting in a voltage level at the output. A comparator compares the resultant voltage to a reference voltage signal to determine whether the resultant voltage is above or below a predefined threshold. The threshold is chosen as lying between an anticipated resultant voltage for a video driver having a display device connected thereto and an anticipated resultant voltage for a video driver without a display device connected thereto.
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