Baseline update procedure for touch sensitive device
A touch sensitive device implementing a routine that controls the device's baseline update procedure in certain circumstances, and associated methods.
1. A method of determining to update baseline values associated with nodes on a mutual capacitive type touch sensitive device, comprising:
receiving data streams associated with the capacitive coupling at a plurality of nodes on a touch sensor, over a plurality of measurement cycles;
determining, based on the data streams, if a sufficient portion of the plurality of nodes have been trending toward or away from touch for a sufficient period of time; and
updating baseline values associated with at least some of the nodes on the touch sensor if a sufficient portion of the plurality of nodes have been trending toward or away from touch for a sufficient period of time.
2. The method of claim 1 , wherein the touch sensitive device has a sensor subcomponent that is substantially transparent.
3. The method of claim 1 , wherein a sufficient portion comprises at least 55% of the nodes.
4. The method of claim 1 , wherein a sufficient period of time is at least one second.
5. The method of claim 1 , wherein updating baseline values associated with at least some portion of the nodes comprises all of the nodes.
6. The method of claim 1 , wherein the baseline value is a threshold value, the threshold value being indicative of a touch condition.
7. A touch sensitive device comprising:
a touch matrix-type touch sensor having a plurality of nodes;
electronics communicatively coupled to the nodes and configured to measure the capacitive coupling at individual nodes of the touch sensor;
wherein the electronics are configured to:
receive data streams indicative of the capacitive coupling at a plurality of nodes on the touch sensor
determine, based on the data streams, if a sufficient portion of the plurality of nodes have been trending toward or away from touch for a sufficient period of time; and,
update baseline values associated with at least some of the nodes on the touch sensor, when a sufficient portion of the plurality of nodes have been trending toward or away from touch for a sufficient period of time.
8. The touch sensitive device of claim 7 , wherein the touch sensor is substantially transparent.
9. The touch sensitive device of claim 7 , wherein a sufficient period of time is at least one second.
10. The touch sensitive device of claim 7 , wherein a sufficient portion comprises at least 55% of the nodes.
11. The touch sensitive device of claim 7 , wherein the baseline value is a threshold value, the threshold value being indicative of a touch condition.