Touch sensor with non-uniform resistive band
First Claim
1. A touch sensor, comprising:
- a substrate having a resistive touch region;
a set of electrodes electrically coupled to the touch region; and
a plurality of band segments framing the touch region and having an intermediate resistivity between the resistivity of the electrodes and the resistivity of the touch region, wherein the electrodes are disposed between the band segments, and at least one of the band segments has a linear resistance that varies along its length, each band segment being continuous or quasi-continuous along at least a portion of its length.
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Accused Products
Abstract
The present inventions are directed to touch sensors with improved topological equivalence between an equipotential space and a Cartesian space to which the equipotential space will be mapped. The touch sensor comprises a substrate with a touch region, and a set of electrodes that are electrically coupled to the touch region. The touch sensor further comprises a plurality of resistive band segments that frames the touch region. The electrodes are located between the resistive band segments. Each resistive band segment has a resistivity that is intermediate between the resistivity of the electrodes and the resistivity of the touch region, thereby providing a transition between the low resistivity electrodes and the high resistivity touch region, and improving the topological equivalence within the corners of the touch region. At least one of the band segments has a non-uniform linear resistance to provide further improvement to the topological equivalence.
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Citations
38 Claims
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1. A touch sensor, comprising:
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a substrate having a resistive touch region;
a set of electrodes electrically coupled to the touch region; and
a plurality of band segments framing the touch region and having an intermediate resistivity between the resistivity of the electrodes and the resistivity of the touch region, wherein the electrodes are disposed between the band segments, and at least one of the band segments has a linear resistance that varies along its length, each band segment being continuous or quasi-continuous along at least a portion of its length. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A dynamic touch sensor system, comprising:
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a touch sensor that generates touch information in response to a touch and generates measurable information indicative of a given electrical characteristic in the touch sensor, the touch sensor comprising a substrate having a resistive touch region, a set of electrodes electrically coupled to the touch region, and a band framing the touch region and having a resistivity intermediate the resistivity of the electrodes and the resistivity of the touch region, wherein the band has a substantially non-uniform linear resistance, the band being continuous or quasi-continuous along at least a portion of its length; and
control electronics coupled to the electrodes for receiving the touch information and measurable information from the touch sensor, wherein the control electronics uses an algorithm to determine the coordinates of the location of the touch in the touch region based on the touch information, and modifies the algorithm based on the measurable information. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A touch sensor, comprising:
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a substrate having a resistive touch region;
a set of electrodes electrically coupled to the touch region; and
a plurality of band segments framing the touch region and having a resistivity intermediate between the resistivity of the electrodes and the resistivity of the touch region, wherein the electrodes are disposed between the band segments, and at least one band segment comprises a continuous resistive background material and an array of electrically conductive elements disposed substantially perpendicularly along at least a lengthwise band portion of the at least one band segment in contact with the background material, the electrically conductive elements having a resistivity that is lower than the resistivity of the background material, the lengthwise band portion being quasi-continuous along its length. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A touch sensor, comprising:
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a substrate having a resistive touch region with a non-rectangular geometry;
a set of electrodes electrically coupled to the touch region to generate non-linear voltage gradients over the touch region; and
a resistive band framing the touch region and having a resistivity intermediate the resistivity of the electrodes and the resistivity of the touch region, the resistive band being continuous or quasi-continuous along at least a portion of its length. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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Specification