| 摘要 |
PROBLEM TO BE SOLVED: To improve the number of databus lines, i.e., the resolution without deteriorating the number of gradations, in a databus line driving circuit 31 as a voltage output circuit for outputting gradation signals to data bus lines D as plural output lines. SOLUTION: In the digital mode databus line drive circuit 31 arranged so as to sample gradation reference signals being swept within a prescribed voltage range by an analog switch TR and output them to each databus line D, two reference signal lines are arranged as La, Lb, and each databus line D is also provided with two analog switches TRa, TRb corresponding thereto. Thus, when the number of the databus lines are duplicated, the number of gradation levels of the reference signal lines La, Lb is halved to keep a sufficient sampling period, however, the number of gradation levels are maintained, by selectively outputting the reference signals from the two reference signal lines La, Lb within the voltage ranges different from each other.
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