| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption by controlling current loss in a step-up circuit of a liquid crystal display device. SOLUTION: The liquid crystal display device always detects an output value of a video signal 16 outputted from a group of signal electrode driving circuits, and compares the difference between the output voltage value of the group of signal electrode driving circuits and the voltage value of the input power source 101, and thereby controls at any time during a single horizontal period whether to drive signal electrodes by the input power source 101 or whether to drive the signal electrodes by the output converted by a D/A converter circuit 14 and amplified by an amplifier circuit 13. COPYRIGHT: (C)2003,JPO
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