| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a touch panel input device whose power consumption is small as a whole by reducing power consumption for an analog circuit. <P>SOLUTION: The touch panel input device is provided with a pulse generating circuit 28 for generating a pulse for detection for detecting the change of an impedance viewed from a terminal A for impedance detection formed in a resistance film 10 for touch panel position detection and a voltage comparator circuit 25 for judging the change of the impedance based on the waveform of the pulse for detection. Also, this device is provided with a switch control circuit 29 for controlling power supply to an analog circuit 21 for driving the touch panel based on the detected result of the voltage comparator circuit 25. Thus, the change of the impedance to be generated when any input to the touch panel is present is detected, and the analog circuit 21 is operated so that power consumption by the analog circuit 21 when any input to the touch panel is not present can be reduced. <P>COPYRIGHT: (C)2003,JPO</p> |
