Multi-user multi-touch projected capacitance touch sensor with event initiation based on common touch entity detection
Techniques for providing multi-user multi-touch projected capacitive touch sensors are disclosed herein. Some embodiments may include a method that includes receiving a first sense signal from a first sensing array, the first sensing array configured to provide the first sense signal indicating a first touch on a first touch surface of a touch substrate as well as receiving a second sense signal from a second sensing array, the second sensing array configured to provide the second sense signal indicating a second touch on a second touch surface of a second touch substrate occurring concurrently to the first touch. The method may further include determining whether the first touch and the second touch share at least one anti-ghost. The method may also include associating the first touch and the second touch with a common touch entity in response to determining that the first touch and the second touch share the at least one anti-ghost.
1. A method for initiating a multi-touch interaction mode for a touch sensor, comprising:
receiving, via the touch sensor, a first sense signal indicating a first touch and a second sense signal indicating a second touch;
making a first determination that the first touch and the second touch do not share an anti-ghost;
identifying, based on the first determination, a first entity associated with the first touch and a second entity associated with the second touch;
initiating the multi-touch interaction mode for receiving additional touches from the first entity and the second entity;
displaying a prompt for the first entity and the second entity to establish contact;
detecting, after the displaying, a second anti-ghost shared between a concurrent touch interaction, wherein the concurrent touch interaction comprises at least one of the first touch and the second touch or a third touch and a fourth touch;
determining that the contact has been successfully established based on the detected second anti-ghost;
determining an association between the concurrent touch interaction and a security code; and identifying, based on the association, the first entity and the second entity.
2. The method of claim 1 , further comprising:
receiving, via the touch sensor, a third sense signal indicating a third touch;
making a second determination that the first touch and the third touch share a second anti-ghost; and
associating, based on the second determination, the third touch to the first entity.
3. The method of claim 2 , further comprising:
receiving, via the touch sensor, a fourth sense signal indicating a fourth touch;
making a third determination that the second touch and the fourth touch share a third anti-ghost; and
associating, based on the third determination, the fourth touch to the second entity.
4. The method of claim 3 , further comprising:
determining, by the touch sensor, that the first touch, the second touch, the third touch, and the fourth touch occur concurrently.
5. The method of claim 1 , wherein initiating the multi-touch interaction mode allows the touch sensor to support detection of simultaneous multi-touch interaction from the first entity and the second entity.
6. The method of claim 1 , wherein the first touch and the second touch are detected concurrently by the touch sensor.
7. The method of claim 1 , further comprising:
assigning a first touch group identifier to the first touch;
assigning a second touch group identifier to the second touch;
assigning the first touch group identifier to subsequent touches determined to be associated with the first entity; and
assigning the second touch group identifier to subsequent touches determined to be associated with the second entity.
8. A projected capacitive touch sensor, comprising:
a touch substrate including a touch surface;
a sensing array configured to provide sense signals indicating a first touch and a second touch occur concurrently on the touch surface of the touch substrate; and
a controller configured to:
detect, based on the sense signals, the first touch and the second touch;
make a first determination that the first touch and the second touch do not share an anti-ghost;
identify, based on the first determination, a first entity associated with the first touch and a second entity associated with the second touch;
initiate a multi-touch interaction mode of the projected capacitive touch sensor for receiving additional touches from the first entity and the second entity;
display a prompt for the first entity and the second entity to establish contact;
detect, after the displaying, a second anti-ghost shared between a concurrent touch interaction, wherein the concurrent touch interaction comprises at least one of the first touch and the second touch or a third touch and a fourth touch;
determine that the contact has been successfully established based on the detected second anti-ghost;
determine an association between the concurrent touch interaction and a security code; and
identify, based on the association, the first entity and the second entity.
9. The projected capacitive touch sensor of claim 8 , wherein the controller is further configured to:
detect, based on the sense signals, a third touch;
make a second determination that the first touch and the third touch share a second anti-ghost;
associate, based on the second determination, the third touch to the first entity; and
initiate, concurrently with the multi-touch interaction mode, a common touch interaction mode between the first touch and the third touch.
10. The projected capacitive touch sensor of claim 9 , wherein the controller is further configured to:
detect, based on the sense signals, a fourth touch;
make a third determination that the second touch and the fourth touch share a third anti-ghost; and
associate, based on the third determination, the fourth touch to the second entity.
11. The projected capacitive touch sensor of claim 10 , wherein the controller is further configured to:
determine that the first touch, the second touch, the third touch, and the fourth touch occur concurrently.
12. The projected capacitive touch sensor of claim 8 , wherein the sensing array defines a sensing axis and wherein making the first determination that the first touch and the third touch share a second anti-ghost, the controller is further configured to:
determine whether the first touch and the second touch occurred along the sensing axis; and
responsive to determining that the first touch and the second touch do not occur along the sensing axis, determining that the first touch and the second touch do not share the second anti-ghost.
13. The projected capacitive touch sensor of claim 8 , wherein the controller is further configured to:
assigning a first touch group identifier to the first touch;
assigning a second touch group identifier to the second touch;
assigning the first touch group identifier to subsequent touches determined to be associated with the first entity; and
assigning the second touch group identifier to subsequent touches determined to be associated with the second entity.
14. A method for initiating a multi-touch interaction mode for a plurality of entities, comprising:
detecting, via a plurality of touch sensors, a first touch and a second touch;
making a first determination that the first touch and the second touch do not share an anti-ghost;
identifying, based on the first determination, a first entity associated with the first touch and a second entity associated with the second touch;
initiating the multi-touch interaction mode for receiving additional touches from the first entity and the second entity;
displaying a prompt for the first entity and the second entity to establish contact;
detecting, after the displaying, a second anti-ghost shared between a concurrent touch interaction, wherein the concurrent touch interaction comprises at least one of the first touch and the second touch or a third touch and a fourth touch;
determining that the contact has been successfully established based on the detected second anti-ghost;
determining an association between the concurrent touch interaction and a security code; and
identifying, based on the association, the first entity and the second entity.
15. The method of claim 14 , wherein the plurality of touch sensors comprise a first touch sensor and a second touch sensor and wherein the first touch sensor and the second touch sensor run synchronously.
16. The method of claim 14 , wherein the plurality of touch sensors comprise a first touch sensor and a second touch sensor and wherein the first touch sensor and the second touch sensor run asynchronously.