System and method for detecting locations of touches on a projected capacitive touch sensor
First Claim
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1. A projected capacitive touch sensor, comprising:
- a substrate; and
at least a first set, a second set, and a third set of electrodes coupled to a first area of the substrate, wherein;
the first set of electrodes comprises a horizontal sensing electrode that extends along a height of a first column within the first area of the substrate;
the second set of electrodes comprises at least two vertical sensing electrodes that extend partially along a height of a second column within the first area of the substrate; and
the third set of electrodes comprises at least one vertical sensing electrode more than the second set of electrodes that extend partially along a height of a third column within the first area of the substrate, the third column comprising at least two vertical sensing electrodes that are physically separate with respect to each other and electrically connected to each other;
wherein the horizontal sensing electrode in the first area of the substrate is electrically disconnected from a corresponding horizontal sensing electrode in a second area of the substrate,wherein two of the vertical sensing electrodes in the second set of electrodes are physically separated from each other at a first distance from a top edge of the first area of the substrate, andwherein the vertical sensing electrodes in the third set of electrodes are physically separated from each other at a set of distances from the top edge of the first area of the substrate, wherein distances in the set of distances are different from each other and from the first distance, and wherein at least two of the vertical sensing electrodes in the third set of electrodes have different lengths along the height of the third column.
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Abstract
A projected capacitive touch sensor includes a substrate and sets of electrodes coupled to corresponding areas of the substrate. The areas are non-overlapping with respect to each other. The sets of electrodes include a horizontal sensing electrode that extends along a height of a first column within the area and vertical sensing electrodes that extend partially along the height of at least one column within the area. The at least one column includes at least two vertical sensing electrodes that are physically separate with respect to each other and electrically connected to each other.
44 Citations
20 Claims
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1. A projected capacitive touch sensor, comprising:
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a substrate; and at least a first set, a second set, and a third set of electrodes coupled to a first area of the substrate, wherein; the first set of electrodes comprises a horizontal sensing electrode that extends along a height of a first column within the first area of the substrate; the second set of electrodes comprises at least two vertical sensing electrodes that extend partially along a height of a second column within the first area of the substrate; and the third set of electrodes comprises at least one vertical sensing electrode more than the second set of electrodes that extend partially along a height of a third column within the first area of the substrate, the third column comprising at least two vertical sensing electrodes that are physically separate with respect to each other and electrically connected to each other; wherein the horizontal sensing electrode in the first area of the substrate is electrically disconnected from a corresponding horizontal sensing electrode in a second area of the substrate, wherein two of the vertical sensing electrodes in the second set of electrodes are physically separated from each other at a first distance from a top edge of the first area of the substrate, and wherein the vertical sensing electrodes in the third set of electrodes are physically separated from each other at a set of distances from the top edge of the first area of the substrate, wherein distances in the set of distances are different from each other and from the first distance, and wherein at least two of the vertical sensing electrodes in the third set of electrodes have different lengths along the height of the third column. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A projected capacitive touch sensor system, comprising:
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a substrate; at least a first set, a second set, and a third set of electrodes coupled to a first area of the substrate, wherein; the first set of electrodes comprises a horizontal sensing electrode that extends along a height of a first column within the first area of the substrate; the second set of electrodes comprises at least two vertical sensing electrodes that extend partially along a height of a second column within the first area of the substrate; and the third set of electrodes comprises at least one electrode more than the second set of electrodes that extend partially along a height of a third column within the first area of the substrate, the third column comprising at least two vertical sensing electrodes that are physically separate with respect to each other and electrically connected to each other; and a controller configured to detect signal levels associated with at least one touch on the substrate from the first, second, and third sets of electrodes, the signal levels associated with the horizontal sensing electrode used to identify the first area of the substrate and the signal levels associated with the vertical sensing electrodes used to determine a vertical location within the first area of the substrate, wherein the horizontal sensing electrode in the first area of the substrate is electrically disconnected from a corresponding horizontal sensing electrode in a second area of the substrate, wherein two of the vertical sensing electrodes in the second set of electrodes are physically separated from each other at a first distance from a top edge of the first area of the substrate, and wherein the vertical sensing electrodes in the third set of electrodes are physically separated from each other at a set of distances from the top edge of the first area of the substrate, wherein distances in the set of distances are different from each other and from the first distance, and wherein at least two of the vertical sensing electrodes in the third set of electrodes have different lengths along the height of the third column. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of controller operation of a projected capacitive touch sensor system, the projected capacitive touch sensor system comprising a controller, a substrate, and sets of electrodes coupled to one or more areas of the substrate, the sets of electrodes comprising a first set of at least two vertical sensing electrodes, a second set of at least three vertical sensing electrodes, and a horizontal sensing electrode, the method comprising:
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detecting signal levels associated with at least one touch on the substrate from the sets of electrodes; determining at least one area of the substrate of the at least one touch in accordance with the signal levels associated with the horizontal sensing electrode; and determining one or more vertical locations within the at least one area of the substrate of the at least one touch in accordance with the signal levels associated with the vertical sensing electrodes, wherein the horizontal sensing electrode extends along a height of a first column within a first area of the substrate; wherein the first set of at least two vertical sensing electrodes are physically separate with respect to each other and extend partially along a height of a second column within the first area of the substrate, wherein the second set of at least three vertical sensing electrodes extend partially along a height of a third column within the first area of the substrate, the second set of electrodes comprising at least two vertical sensing electrodes that are physically separate with respect to each other and electrically connected to each other, wherein two of the vertical sensing electrodes in the first set of at least two vertical sensing electrodes are physically separated from each other at a first distance from a top edge of the first area of the substrate, wherein vertical sensing electrodes in the second set of electrodes are physically separated from each other at a set of distances from the top edge of the first area of the substrate, wherein distances in the set of distances are different from each other and from the first distance, and wherein the horizontal sensing electrode in the first area of the substrate is electrically disconnected from a corresponding horizontal sensing electrode in a second area of the substrate, the first area and the second area of the substrate being non-overlapping with respect to each other, and wherein at least two of the vertical sensing electrodes in the second set of electrodes have different lengths along the height of the third column. - View Dependent Claims (17, 18, 19, 20)
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Specification