DETECTION OF A CONDUCTIVE OBJECT DURING AN INITIALIZATION PROCESS OF A TOUCH-SENSING DEVICE
First Claim
1. A method, comprising:
- during an initialization process of a touch-sensing device;
measuring a capacitance of a reference sense element,comparing the measured capacitance of the reference sense element to a target measurement output value, andcalibrating a capacitance measurement of the reference sense element to produce a sensing parameter value;
comparing a capacitance measured on each of a plurality of capacitive sense elements based on the sensing parameter value to a baseline capacitance value for each of the plurality of capacitive sense elements to determine a capacitance difference value; and
detecting a presence of a conductive object proximate to a capacitive sense element when the capacitance difference value for the capacitive sense element is greater than a threshold value.
6 Assignments
0 Petitions
Accused Products
Abstract
A method and system for detecting a presence of a conductive object proximate to a capacitive sense element during an initialization process of a touch-sensing device. A reference sense element is calibrated to produce a sensing parameter value. A capacitance of a plurality of capacitive sense elements is measured based on the sensing parameter value, and compared to a baseline capacitance value stored in a non-volatile memory of the touch-sensing device. The presence of a conductive object proximate to a capacitive sense element is detected when a difference between the measured capacitance and the stored baseline capacitance value is greater than a threshold value.
-
Citations
20 Claims
-
1. A method, comprising:
-
during an initialization process of a touch-sensing device; measuring a capacitance of a reference sense element, comparing the measured capacitance of the reference sense element to a target measurement output value, and calibrating a capacitance measurement of the reference sense element to produce a sensing parameter value; comparing a capacitance measured on each of a plurality of capacitive sense elements based on the sensing parameter value to a baseline capacitance value for each of the plurality of capacitive sense elements to determine a capacitance difference value; and detecting a presence of a conductive object proximate to a capacitive sense element when the capacitance difference value for the capacitive sense element is greater than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system, comprising
a processing device coupled to a capacitance sensor comprising a sensing parameter, the processing device configured to: -
measure a capacitance of a reference sense element, compare the measured capacitance of the reference sense element to a target measurement output value, adjust the sensing parameter to a sensing parameter value to set a measured capacitance of the reference sense element to the target measurement output value, compare a capacitance of each of a plurality of capacitive sense elements to a baseline capacitance value for each of the plurality of capacitive sense elements to determine a capacitance difference value, and detect a presence of a conductive object proximate to a capacitive sense element when the capacitance difference value for the capacitive sense element is greater than a threshold value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A computer-readable medium including data that, when accessed by a computer, cause the computer to perform a method comprising:
-
during an initialization process power up of a touch-sensing device, measuring a capacitance of a reference sense element, comparing the measured capacitance of the reference sense element to a target measurement output value, and calibrating a measurement of a reference sense element to produce a sensing parameter value; comparing a capacitance measured on each of a plurality of capacitive sense elements based on the sensing parameter value to a baseline capacitance value stored in a non-volatile memory for each of the plurality of capacitive sense elements to determine a capacitance difference value; and detecting a presence of a conductive object proximate to touch object on a capacitive sense element during the initialization process power up of the touch-sensing device when the capacitance difference value for the capacitive sense element is greater than a touch threshold value. - View Dependent Claims (18, 19, 20)
-
Specification