| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a signal processing circuit of an electrostatic capacity type touch sensor for improving noise durability, and for detecting much more points with a small number of touch pads. <P>SOLUTION: A selection circuit 33 selects either a signal from a pair of first and second touch pads 1 and 2 to be output through first and second output terminals CO1 and CO2 of a touch panel or a signal from a pair of third and fourth touch pads 3 and 4 to be output through third and fourth output terminals CO3 and CO4. A charge amplifier 34 outputs first and second output voltages V1 and V2 corresponding to the capacitance difference of the touch panel on the basis of the selected signal, and calculates a touch position angleθfrom the first and the second output voltages V1 and V2. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
