Integrated Test System for a Touch Sensor
First Claim
1. A method comprising:
- restricting current flow between a node of a touch sensor and each of a drive system of the touch sensor, a sense system of the touch sensor, and a test system of the touch sensor;
capacitively coupling the drive system to the sense system through the test system;
using at least the drive system and the test system, inducing a charge on the sense system;
measuring the induced charge on the sense system; and
making a pass or fail determination for at least a portion of the touch sensor based at least in part on the measured induced charge.
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Accused Products
Abstract
In one embodiment, a method includes restricting current flow between a node of a touch sensor and each of a drive system of the touch sensor, a sense system of the touch sensor, and a test system of the touch sensor. The method further includes capacitively coupling the drive system to the sense system through the test system. The method further includes using at least the drive system and the test system, inducing a charge on the sense system. The method further includes measuring the induced charge on the sense system. The method further includes making a pass or fail determination for at least a portion of the touch sensor based at least in part on the measured induced charge.
32 Citations
20 Claims
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1. A method comprising:
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restricting current flow between a node of a touch sensor and each of a drive system of the touch sensor, a sense system of the touch sensor, and a test system of the touch sensor; capacitively coupling the drive system to the sense system through the test system; using at least the drive system and the test system, inducing a charge on the sense system; measuring the induced charge on the sense system; and making a pass or fail determination for at least a portion of the touch sensor based at least in part on the measured induced charge. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a test system configured to emulate a node of the apparatus; a drive system comprising a plurality of drive electrodes, each drive electrode configured to transfer a charge in response to a voltage applied to the drive electrode; a sense system capacitively coupled to the drive system through each of first and second conductive paths, the first conductive path comprising the test system, the second conductive path comprising the node, the sense system comprising a plurality of sense electrodes, each sense electrode configured to receive the charge transferred by a respective one of the plurality of drive electrodes; and a switch system configured to selectively open and close each of the first and second conductive paths such that when the first conductive path is closed and the second conductive path is open the test system emulates the node of the apparatus, and when the first conductive path is open and the second conductive path is closed the test system is electrically decoupled from each of the drive system, the sense system, and the node of the apparatus. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a sense electrode configured to sense a change in capacitance at a node of the apparatus; a drive electrode configured to induce a charge in the sense electrode in response to a voltage applied to the drive electrode; a test system configured when enabled to modify the charge by a predetermined amount; a switch system configured to selectively enable and disable the test system. - View Dependent Claims (17, 18, 19, 20)
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Specification