Video display apparatus with scan conversion and reversion and a video display method using scan conversion and reversion
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United States of America Patent
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Aug 6, 2002
Grant Date -
N/A
app pub date -
Jul 13, 1999
filing date -
Jul 16, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A video signal of an interlaced scanning system having 525 scanning lines and a vertical scanning frequency of 60 Hz is converted to a video signal having 1050 scanning lines and a vertical scanning frequency of 120 Hz, for displaying an image by bidirectional scanning. A vertical synchronizing signal is subjected to offset processing by a 1/4 horizontal scanning period when an odd field is started, thereby keeping interlaced relation between odd and even fields. The vertical synchronizing signal is subjected to offset processing by a 1/2 horizontal scanning period every frame, so that the scanning direction for each scanning line is reversed every frame.
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