SYSTEM FOR USING SYNCHRONIZED TIMED ORTHOGONAL MEASUREMENT PATTERNS TO ENABLE HIGH UPDATE REPORT RATES ON A LARGE CAPACITIVE TOUCH SCREEN
First Claim
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1. A method for increasing a report rate of a position of at least one object on a touch sensor, said method comprising:
- providing a touch sensor including a substantially orthogonal array of X and Y electrodes disposed on two layers of a touch sensor substrate, the X and Y electrodes being capable of functioning as drive and sense electrodes;
creating an image of the at least one object on the touch sensor by applying synchronized timed orthogonal measurement stimulus patterns to the X and the Y electrodes; and
providing an increased report rate by updating the image of the touch sensor after applying a single stimulus pattern to the touch sensor.
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Abstract
A system and method for increasing a report rate on a capacitive touch sensor to thereby provide a real-time display of the position of all the objects on a touch screen that is using synchronized timed orthogonal measurement stimulus patterns to determine the position of objects on the touch sensor, by updating an image of the reported positions of objects on the touch sensor each time that a measurement is taken on each of the sensor electrodes instead of waiting for a complete scan of all the sensor electrodes in a sensor electrode array.
7 Citations
21 Claims
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1. A method for increasing a report rate of a position of at least one object on a touch sensor, said method comprising:
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providing a touch sensor including a substantially orthogonal array of X and Y electrodes disposed on two layers of a touch sensor substrate, the X and Y electrodes being capable of functioning as drive and sense electrodes; creating an image of the at least one object on the touch sensor by applying synchronized timed orthogonal measurement stimulus patterns to the X and the Y electrodes; and providing an increased report rate by updating the image of the touch sensor after applying a single stimulus pattern to the touch sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for increasing a report rate of a position of at least one object on a touch sensor, said method comprising:
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providing a touch sensor including a substantially orthogonal array of X and Y electrodes disposed on two layers of a touch sensor substrate, the X and Y electrodes being capable of functioning as drive and sense electrodes; creating an image of the at least one object on the touch sensor by applying synchronized timed orthogonal measurement stimulus patterns to the X and the Y electrodes; and providing an increased report rate by updating the image of the touch sensor by; a. selecting an index value i and then subtracting a previous measurement result corresponding to the index value i from a results array; b. taking a new measurement using a stimulus pattern that corresponds to the index value i; c. adding the new measurement to the results array; d. saving the new measurement value in a previous measurement results array; and e. updating the image of the at least one object on the touch sensor. - View Dependent Claims (18, 19, 20, 21)
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Specification