Liquid crystal display device
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United States of America Patent
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Jan 30, 2001
Grant Date -
N/A
app pub date -
Aug 27, 1998
filing date -
Aug 29, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A liquid crystal display device having output buffers corresponding to column lines, and comprising analog switches provided between output ends of the output buffers and the column lines respectively, and a switch controller for on-off controlling the analog switches. A DA converter is provided in the preceding stage of the output buffers, and the switch controller turns off the analog switches during a DA conversion period of the DA converter or during a precharge period prior to DA conversion, and turns on the analog switches during a predetermined period other than such periods. The output buffers are disconnected from or connected to the column lines when the analog switches are turned off or turned on. Therefore the output circuit can be separated from a capacitive load by disconnecting the output buffers from the column lines through turning off the analog switches during a DA conversion period of a DA converter provided in the preceding stage of the output circuit or during a precharge period prior to DA conversion, hence preventing increase of the output current of each output buffer while ensuring sufficient change of the signal potential.
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