Alignment of cathode ray tube displays using a video graphics controller
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United States of America Patent
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Aug 20, 2002
Grant Date -
N/A
app pub date -
Sep 24, 1997
filing date -
Jan 16, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Dynamic adjustment techniques for aligning video images in cathode ray tube (CRT) devices are disclosed. A host computer stores correction factor data and video image data in video graphics controller RAM. The host computer processes and transmits the correction factor data, representative of the cathode ray tube distortion characteristics, to the CRT device during the retrace time of the electron beam and video image data during the trace time. The correction factor data may be generated by a vision system, a gain matrix table, interpolation engine or manual methods. Circuitry, within the CRT device, for separating the correction factor data from the video signal is disclosed along with the methods and apparatus used to decode correction data. Data can also be transferred from the monitor back to the host computer over the video connector.
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