Column electrode drive circuit of liquid crystal display device capable of simultaneously applying display voltages to column electrodes as well as sequentially applying scanning voltages to column electrodes
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United States of America Patent
Stats
-
Dec 10, 1996
Grant Date -
N/A
app pub date -
Aug 19, 1994
filing date -
Aug 24, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is provided a column electrode drive circuit applicable to a display-integrated type tablet. A hold circuit has a plurality D-flip-flops. To clock terminals of the flip-flops is input an output signal of an AND circuit which receives inputs of a hold signal and a clock signal. To data terminals of the flip-flops are input sampled display signals. With the above-mentioned arrangement, when the hold signal is at 'H' level, the sampled display signals are sequentially output as display signals without modification based on the clock signal. When the hold signal is a pulse signal, the sampled display signals are simultaneously output and held as the display signals. By thus making a simultaneous output function and a sequential output function compatible, the column electrode drive circuit can be utilized as a column electrode drive circuit for the display-integrated type tablet device.
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