发明名称 |
Signal processing circuit for electrostatic capacitor type touch sensor |
摘要 |
The invention realizes certainly detecting two or more positions on a touch panel that are touched at the same time. A drive circuit selects one from X lines, and supplies an alternating drive voltage to the selected line. A multiplexer selects a first sense line and a second sense line from Y lines that extend to cross the X lines. A charge amplifier outputs an output voltage corresponding to a difference between a first capacitance between the first sense line and the X line selected by the drive circuit and a second capacitance between the second sense line and the X line selected by the drive circuit. A touch position is then detected based on the output voltage of the charge amplifier. |
申请公布号 |
US8619057(B2) |
申请公布日期 |
2013.12.31 |
申请号 |
US20100794349 |
申请日期 |
2010.06.04 |
申请人 |
KOBAYASHI KAZUYUKI;SUZUKI TATSUYA;FUKAI KUMIKO;KANETA YASUHIRO;SANYO SEMICONDUCTOR CO., LTD.;SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC |
发明人 |
KOBAYASHI KAZUYUKI;SUZUKI TATSUYA;FUKAI KUMIKO;KANETA YASUHIRO |
分类号 |
G06F3/045 |
主分类号 |
G06F3/045 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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