MULTI-TOUCH DETECTION
First Claim
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1. A method comprising:
- operating a sensor for capacitive based detection of user interactions, the sensor including sensor lines arranged along a first axis and along a second axis to form a grid;
sampling first outputs of the sensor responsive to simultaneously triggering a first set of the sensor lines with a same signal over a first stage of detection;
selecting a second set of the sensor lines that indicate a presence of the user interactions based on the first outputs sampled;
scanning based on a multi-touch detection method only the second set over a second stage of detection to receive second outputs; and
determining positions of the user interactions from the second outputs.
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Abstract
A method for multi-touch detection in a touch input device comprising a grid based sensor, the method comprises sampling outputs from a grid based sensor over a first stage of detection, selecting sensor lines based on the sampled outputs, scanning the selected sensor lines along one axis of the grid based sensor over a second stage of detection, and determining positions of user interaction based on outputs sampled in response to scanning the selected sensor lines during the second stage of detection.
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Citations
20 Claims
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1. A method comprising:
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operating a sensor for capacitive based detection of user interactions, the sensor including sensor lines arranged along a first axis and along a second axis to form a grid; sampling first outputs of the sensor responsive to simultaneously triggering a first set of the sensor lines with a same signal over a first stage of detection; selecting a second set of the sensor lines that indicate a presence of the user interactions based on the first outputs sampled; scanning based on a multi-touch detection method only the second set over a second stage of detection to receive second outputs; and determining positions of the user interactions from the second outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device comprising:
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a sensor including sensor lines arranged along a first axis and along a second axis to form a grid; and a circuit in communication with the sensor, the circuit configured to; sample first outputs of the sensor responsive to simultaneously triggering a plurality first set of the sensor lines of the sensor with a same signal over a first stage of detection; select a second set of the sensor lines of the sensor that indicate a presence of the user interactions from based on the first outputs sampled; scan based on a multi-touch detection method only the second set one sensor line at a time over a second stage of detection to receive second outputs; sample second outputs responsive to the scanning over the second stage of detection; and determine positions of the user interactions on the sensor from the second outputs sampled over the second stage of detection. - View Dependent Claims (18, 19, 20)
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Specification