Discriminative capacitive touch panel
First Claim
1. A mutual capacitance touch sensor, comprising:
- a substrate;
an array of electrode elements formed on the substrate, each electrode element including at least one of a first electrode group comprising at least two drive electrodes and at least one sense electrode, or a second electrode group comprising at least two sense electrodes and at least one drive electrode, wherein the respective electrodes of the first or second group are arranged to form multiple capacitances over different coupling distances; and
a controller operatively coupled to the array of electrode elements, the controller configured to assign an input object as a conductive object according to a first characteristic change of the multiple capacitances as the input object approaches the touch sensor, and assign the input object as non-conductive object according to a second characteristic change of the multiple capacitances different from the first characteristic change as the input object approaches the touch sensor.
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Accused Products
Abstract
A mutual capacitance touch sensor includes a substrate, and an array of electrode elements formed on the substrate. Each electrode element includes at least one of a first electrode group having at least two drive electrodes and at least one sense electrode, or a second electrode group having at least two sense electrodes and at least one drive electrode. The respective electrodes of the first or second group are arranged to form multiple capacitances over different coupling distances. A controller is operatively coupled to the array of electrode elements, the controller configured to assign an input object as a conductive object when measurements of the multiple capacitances decrease as the input object approaches the touch sensor, and assign the input object as non-conductive object when measurements of at least one of the multiple capacitances increase as the input object approaches the touch sensor.
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Citations
23 Claims
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1. A mutual capacitance touch sensor, comprising:
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a substrate; an array of electrode elements formed on the substrate, each electrode element including at least one of a first electrode group comprising at least two drive electrodes and at least one sense electrode, or a second electrode group comprising at least two sense electrodes and at least one drive electrode, wherein the respective electrodes of the first or second group are arranged to form multiple capacitances over different coupling distances; and a controller operatively coupled to the array of electrode elements, the controller configured to assign an input object as a conductive object according to a first characteristic change of the multiple capacitances as the input object approaches the touch sensor, and assign the input object as non-conductive object according to a second characteristic change of the multiple capacitances different from the first characteristic change as the input object approaches 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 determining the presence, type or position of at least one input object relative to a touch panel, wherein a controller circuit provides capacitance measurements from the touch panel, the method comprising:
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inputting capacitance measurement data from the controller circuit into a data frame; calibrating the data frame such that data represented therein corresponds to a change in capacitance relative to a state when the at least one input object is not present; analysing the data in the data frame to determine if the at least one input object is within a detection range of the touch panel; and when the at least one input object is within the detection range of the touch panel, determining a type and position of the at least one input object based on the data in the data frame. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification