Compensation of a target object coupling to feeding lines in capacitive sensing system
An input device has one or more electrodes configured for capacitive sensing, an electronic circuit, one or more conductive feed line(s) connecting the one or more electrode(s) with the electronic circuit, wherein the device is configured to increase or decrease a signal received from at least one of the electrodes through an associated feed line in function of at least one other signal from another electrode.
1. An input device comprising one or more electrodes configured for capacitive sensing, an electronic circuit, one or more conductive feed line connecting said electrodes with said electronic circuit, further comprising one or more additional feed lines connected to the electronic circuit which are not connected with any electrodes, wherein at least one other signal is generated by the one or more additional feed lines wherein the one or more additional feed lines each operate as an electrode and wherein the at least one other signal is used to correct a sensor signal;
wherein an electrode is split into multiple segments and a feed line is routed between at least two electrode segments, wherein the electrode segments are galvanically connected through a connection line.
2. The input device according to claim 1 , wherein an additional feed line is arranged in the vicinity of another feed line.
3. The input device according to claim 2 , wherein an additional feed line runs at least partly in parallel with the another feed line.
4. The input device according to claim 1 , wherein an additional feed line is arranged in the vicinity of another electrode.
5. The input device according to claim 1 , comprising analog circuitry to increase or decrease the sensor signal.
6. The input device according to claim 1 , comprising digital circuitry to increase or decrease the sensor signal.
7. The input device according to claim 1 , wherein the electronic circuit comprises a processor configured to compute a position of an object within a three-dimensional detection space or to detect movement patterns or gestures of said object from received sensor signals.
8. The input device according to claim 1 , wherein a signal from an electrode connected with the feed line routed between the at least two electrode segments is corrected by a signal received from the multiple segment electrode multiplied by a compensation factor.
9. A method for compensating parasitic capacitive coupling effects in a capacitive sensor system comprising one or more electrodes coupled with an electronic circuit through one or more conductive feed lines, the method comprising arranging one or more additional feed lines connected to the electronic circuit which are not connected with any electrodes, and generating the at least one other signal by the one or more additional feed lines, wherein the one or more additional feed lines each operate as an electrode, and
correcting a sensor signal by the at least one other signal.
10. The method according to claim 9 , wherein an additional feed line is arranged in the vicinity of another feed line.
11. The method according to claim 9 , wherein an additional feed line is arranged in the vicinity of another electrode.
12. The method according to claim 11 , wherein an additional feed line runs at least partly in parallel with the another feed line.
13. The method according to claim 9 , comprising the step of increasing or decreasing the signal by an analog circuitry.
14. The method according to claim 9 , comprising the step of increasing or decreasing the signal by a digital circuitry.
15. The method according to claim 9 , further comprising computing a position of an object within a three-dimensional detection space from received sensor signals.
16. A method for compensating parasitic capacitive coupling effects in a capacitive sensor system comprising one or more electrodes coupled with an electronic circuit through one or more conductive feed lines, the method comprising the steps of:
splitting an electrode into multiple segments and routing a feed line between at least two electrode segments, wherein the electrode segments are galvanically connected through a connection line, and
increasing or decreasing a signal received from at least one of the electrode through an associated feed line by a signal received from said at least two electrode segments.
17. The method according to claim 16 , further comprising correcting a signal from an electrode connected with the feed line and routed between the at least two electrode segments by a signal received from the multiple segment electrode multiplied by a compensation factor.