SEMICONDUCTOR INTEGRATED CIRCUIT
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United States of America Patent
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Issued Date -
Aug 14, 2008
app pub date -
Jan 18, 2008
filing date -
Jan 18, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A semiconductor integrated circuit for driving a display such as a plasma display has a plurality of output bit circuits each including a latch circuit, a comparator circuit comparing the state of the latch circuit output for its own output bit circuit with the state of the latch circuit output for adjacent output bit circuits on both sides and also comparing the result of this comparison with the result of a comparison for the next inputted data, and a storage circuit holding these results. When the comparator circuit detects that the states of the outputs of all three output bit circuits are continuously the same, the output rise or fall is controlled by output transistors so as to be slow. This enables the output state transition to have a specified time duration regardless of the magnitude of the load, to reduce electromagnetic noise.
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