发明名称 |
Current-Based Charge Compensation in a Touch Sensor |
摘要 |
In one embodiment, a method comprises generating a first current at a current source having a magnitude based on the magnitude of a second current flowing from a capacitive node of a touch sensor in the absence of a touch with respect to the capacitive node. The method further includes generating a third current from the capacitive node of the touch sensor in the presence of a touch with respect to the capacitive node. The first current and the third current are summed to cancel out at least a portion of the third current. The method further includes integrating, by an integrator, the sum of the first current and the third current to generate an output voltage. |
申请公布号 |
US2014210491(A1) |
申请公布日期 |
2014.07.31 |
申请号 |
US201313753755 |
申请日期 |
2013.01.30 |
申请人 |
Jonsson Carl Olof Fredrik |
发明人 |
Jonsson Carl Olof Fredrik |
分类号 |
G01R27/26 |
主分类号 |
G01R27/26 |
代理机构 |
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代理人 |
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主权项 |
1. An apparatus comprising:
a touch sensor controller operable to:
apply a first voltage to a drive line of a touch sensor;transition the voltage applied to the drive line from the first voltage to a second voltage;sum a first current received from a sense line in response to the voltage transition applied to the drive line and a second current generated by a current source, the summing canceling out at least a portion of the first current;integrate, by an integrator, the sum of the first current and the second current to generate an output voltage; anddetermine, based on the output voltage, whether a touch has occurred with respect to a capacitive node coupled to the drive line and the sense line. |
地址 |
Gavle SE |