发明授权
US08232810B2 Extended proximity sensor device with electrostatic discharge protection
有权
具有静电放电保护的扩展接近传感器装置
- 专利标题: Extended proximity sensor device with electrostatic discharge protection
- 专利标题(中): 具有静电放电保护的扩展接近传感器装置
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申请号: US12464743申请日: 2009-05-12
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公开(公告)号: US08232810B2公开(公告)日: 2012-07-31
- 发明人: Joseph Kurth Reynolds , Tracy Scott Dattalo
- 申请人: Joseph Kurth Reynolds , Tracy Scott Dattalo
- 申请人地址: US CA Santa Clara
- 专利权人: Synaptics Incorporated
- 当前专利权人: Synaptics Incorporated
- 当前专利权人地址: US CA Santa Clara
- 代理机构: Ingrassia Fisher & Lorenz, P.C.
- 主分类号: G01R27/26
- IPC分类号: G01R27/26 ; G06F3/045
摘要:
An input device is provided with improved electrostatic discharge protection. Specifically, the input device includes a plurality of capacitive sensing electrodes configured for object detection. An electrostatic discharge (ESD) shunt is disposed near the capacitive sensing electrodes and configured to provide ESD protection to the capacitive sensing electrodes. The input device also includes an extended-proximity capacitive sensing electrode configured to for object detection of relatively distant objects. The ESD shunt has an associated first resistance, and the extended-proximity capacitive sensing electrode has an associated second resistance. The second resistance is greater than the first resistance such that an electrostatic discharge at a first exposed location would be attracted to the ESD shunt via a first potential discharge path instead of being attracted to the extended-proximity capacitive sensing electrode via a second potential discharge path, where the first discharge path is longer than the second discharge path.
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