Capacitive coupling reduction in touch sensor panels
First Claim
1. A touch sensor panel comprising:
- a plurality of touch electrodes, an area of two or more of the plurality of touch electrodes being the same;
one or more channels located between adjacent rows of the plurality of touch electrodes;
a plurality of routing traces located in the one or more channels and configured to electrically couple the plurality of touch electrodes to sense circuitry, the plurality of routing traces located on a same layer as the plurality of touch electrodes;
one or more dummy traces located on the same layer as the plurality of touch electrodes and the plurality of routing traces; and
a guard layer configured to capacitively couple to the one or more dummy traces, wherein;
the guard layer comprises a plurality of sections of conductive material separated by sections of gaps and is located on a different layer than the plurality of touch electrodes;
at least a portion of one of more sections of the conductive material overlaps at least a portion of one of the plurality of touch electrodes; and
the sections of gaps are configured to allow capacitive coupling between an object and the plurality of touch electrodes.
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Accused Products
Abstract
Touch sensor panel configurations and methods for improving touch sensitivity of some or all of the electrodes or portions of the touch sensor panel are disclosed. The touch sensor panel configurations can allow increased speed at which the panel can operate. In some examples, the performance of a given touch electrode can differ from the performance of another touch electrode due to differences in capacitance and/or resistance. The performance of the touch sensor panel can be limited by the touch electrode with the lowest performance relative to the other touch electrodes. The configurations and methods can increase the performance of the touch sensor panel by minimizing the capacitive coupling and/or resistance of touch electrodes. Examples of the disclosure can provide configurations of touch sensor panels and methods for improving optical uniformity of the panel.
57 Citations
17 Claims
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1. A touch sensor panel comprising:
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a plurality of touch electrodes, an area of two or more of the plurality of touch electrodes being the same; one or more channels located between adjacent rows of the plurality of touch electrodes; a plurality of routing traces located in the one or more channels and configured to electrically couple the plurality of touch electrodes to sense circuitry, the plurality of routing traces located on a same layer as the plurality of touch electrodes; one or more dummy traces located on the same layer as the plurality of touch electrodes and the plurality of routing traces; and a guard layer configured to capacitively couple to the one or more dummy traces, wherein; the guard layer comprises a plurality of sections of conductive material separated by sections of gaps and is located on a different layer than the plurality of touch electrodes; at least a portion of one of more sections of the conductive material overlaps at least a portion of one of the plurality of touch electrodes; and the sections of gaps are configured to allow capacitive coupling between an object and the plurality of touch electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of fabricating a touch sensor panel, the method comprising:
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forming a plurality of touch electrodes, an area of two or more of the plurality of touch electrodes being the same; forming one or more channels located between adjacent rows of the plurality of touch electrodes; forming a plurality of routing traces in the one or more channels, the plurality of routing traces configured to electrically couple the plurality of touch electrodes to sense circuitry, the plurality of routing traces located on a same layer as the plurality of touch electrodes; forming one or more dummy traces on the same layer; and forming a guard layer, the guard layer configured to capacitively couple to the one or more dummy traces, wherein; the guard layer comprises a plurality of sections of conductive material separated by sections of gaps and is located on a different layer than the plurality of touch electrodes; at least a portion of one of more sections of the conductive material overlaps at least a portion of one of the plurality of touch electrodes; and the sections of gaps are configured to allow capacitive coupling between an object and the plurality of touch electrodes. - View Dependent Claims (15, 16)
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17. A method for operating a touch sensor panel, the method comprising:
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sensing a touch by sampling a plurality of touch electrodes, wherein two or more of the plurality of touch electrodes is sampled at a touch scanning frequency, the touch scanning frequency based on one or more properties of the two or more of the plurality of touch electrodes, wherein the one or more properties of the two or more of the plurality of touch electrodes are the same; driving one or more dummy electrode sections that is in proximity to the one or more of the plurality of touch electrodes to reduce capacitive coupling; driving a guard layer that is in proximity to the plurality of touch electrodes and the one or more dummy electrode sections to reduce capacitive coupling, wherein; the guard layer comprises a plurality of sections of conductive material separated by sections of gaps and is located on a different layer than the plurality of touch electrodes; at least a portion of one of more sections of the conductive material overlaps at least a portion of one of the plurality of touch electrodes; and the sections of gaps are configured to allow capacitive coupling between an object and the plurality of touch electrodes; and determining characteristics of the touch using sense circuitry.
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Specification