Compensation of a target objects coupling to feeding lines in capacitive sensing system
View Patent ↗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 a plurality of reception electrodes configured for capacitive sensing of an alternating electric field generated by a signal fed to a single transmission electrode, an electronic circuit, one or more conductive feed line(s) connecting said reception electrode(s) with an input(s) of said electronic circuit, wherein the input device is configured to increase or decrease a signal received from at least one of the plurality of reception electrodes by combining the signal received from the at least one of the plurality of reception electrodes with a signal from another reception electrode received through an associated feed line, wherein the another reception electrode is not connected to the at least one of the plurality of reception electrodes.
2. The input device according to claim 1 , wherein the feed line associated with the another reception electrode is routed at least partly in parallel with the at least one of the plurality of reception electrodes.
3. The input device according to claim 1 , wherein the feed line associated with the another reception electrode is routed in the vicinity of the at least one of the plurality of reception electrodes.
4. The input device according to claim 1 , comprising analog circuitry receiving the signal from the at least one of the plurality of reception electrodes and the signal from the another reception electrode to increase or decrease the signal.
5. The input device according to claim 1 , comprising digital circuitry receiving the signal from the at least one of the plurality of reception electrodes and the signal from the another reception electrode to increase or decrease the signal.
6. 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.
7. The input device according to claim 1 , wherein a reception 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.
8. The input device according to claim 7 , wherein a signal from a reception 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 receiving electrode(s) coupled with an electronic circuit through one or more conductive feed line(s), the method comprising the steps of:
generating an alternating electric feed by a signal fed to a single transmission electrode;
increasing or decreasing a signal received from at least one of the receiving electrodes through an associated feed line by combining the signal from the at least one of the receiving electrodes with at least one other signal received from another receiving electrode through another associated feed line, wherein the another receiving electrode is not connected to the at least one of the plurality of receiving electrodes.
10. The method according to claim 9 , further comprising routing the feed line associated with the another receiving electrode in parallel with the at least one of the receiving electrodes.
11. The method according to claim 9 , further comprising routing the feed line associated with the another receiving electrode in the vicinity of the at least one of the receiving electrodes.
12. The method according to claim 9 , wherein the step of combining comprises the step of increasing or decreasing the signal by an analog circuitry.
13. The method according to claim 9 , wherein the step of combining comprises the step of increasing or decreasing the signal by a digital circuitry.
14. The method according to claim 9 , further comprising computing a position of an object within a three-dimensional detection space from received sensor signals.
15. The method according to claim 9 , further comprising splitting a receiving 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.
16. The method according to claim 15 , further comprising correcting a signal from a receiving 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.
17. An input device comprising one or more receiving electrodes configured for capacitive sensing of an alternating electric field generated by a signal fed to a single transmission electrode, an electronic circuit, one or more conductive feed line connecting said receiving electrodes with said electronic circuit, wherein at least one receiving electrode provides a sensor signal through an associated feeding line to 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 said sensor signal.
18. The input device according to claim 17 , wherein an additional feed line is arranged in the vicinity of another feed line.
19. The input device according to claim 18 , wherein an additional feed line runs at least partly in parallel with the another feed line.
20. The input device according to claim 17 , wherein an additional feed line is arranged in the vicinity of another electrode.