Double-sided touch-sensitive panel with shield and drive combined layer
First Claim
1. A touch sensor panel, comprising:
- a first set of traces of conductive material having lengths arranged along a first dimension of a two-dimensional coordinate system, an average width of the first set of traces over an entire length of the trace defining a first average width; and
a second set of traces of the conductive material spatially separated from the first set of traces by a dielectric having lengths arranged along a second dimension of the two-dimensional coordinate system, an average width of the second set of traces over an entire length of the trace defining a second average width;
wherein the second average width is substantially greater than the first average width to provide shielding for the first set of traces.
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Abstract
A multi-touch capacitive touch sensor panel can be created using a substrate with column and row traces formed on either side of the substrate. To shield the column (sense) traces from the effects of capacitive coupling from a modulated Vcom layer in an adjacent liquid crystal display (LCD) or any source of capacitive coupling, the row traces can be widened to shield the column traces, and the row traces can be placed closer to the LCD. In particular, the rows can be widened so that there is spacing of about 30 microns between adjacent row traces. In this manner, the row traces can serve the dual functions of driving the touch sensor panel, and also the function of shielding the more sensitive column (sense) traces from the effects of capacitive coupling.
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Citations
22 Claims
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1. A touch sensor panel, comprising:
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a first set of traces of conductive material having lengths arranged along a first dimension of a two-dimensional coordinate system, an average width of the first set of traces over an entire length of the trace defining a first average width; and a second set of traces of the conductive material spatially separated from the first set of traces by a dielectric having lengths arranged along a second dimension of the two-dimensional coordinate system, an average width of the second set of traces over an entire length of the trace defining a second average width; wherein the second average width is substantially greater than the first average width to provide shielding for the first set of traces. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch sensor panel, comprising:
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a plurality of sense traces of conductive material each having an average width defining a sense trace average width; and a plurality of drive traces of the conductive material spatially separated from the plurality of sense traces by a dielectric, the plurality of drive traces each having an average width defining a drive trace average width; wherein the drive trace average width is substantially greater than the sense trace average width to provide shielding for the plurality of sense traces. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for shielding a touch sensor panel, comprising:
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interposing a second layer of conductive material including a plurality of second traces between a first layer of the conductive material including a plurality of first traces and a noise source, the plurality of second traces having an average width defining a second average width and the plurality of first traces having an average width defining a first average width; and configuring the plurality of second traces such that the second average width is substantially greater than the first average width to provide shielding for the first plurality of traces. - View Dependent Claims (16, 17, 18)
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19. A computing device, comprising:
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a circuit capable of emitting electromagnetic interference; a touch sensor panel coupled to the circuit, the touch sensor panel including a first set of traces of conductive material having lengths arranged along a first dimension of a two-dimensional coordinate system, an average width of the first set of traces over an entire length of the trace defining a first average width, and a second set of traces of the conductive material spatially separated from the first set of traces by a dielectric having lengths arranged along a second dimension of the two-dimensional coordinate system, an average width of the second set of traces over an entire length of the trace defining a second average width, wherein the second average width is substantially greater than the first average width to provide shielding for the first set of traces; and a panel subsystem controller coupled to the touch sensor panel, the panel subsystem controller configured for sending stimulation signals to the second set of traces and receiving sense signals from the first set of traces. - View Dependent Claims (20, 21, 22)
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Specification