Double-sided touch-sensitive panel with shield and drive combined layer
First Claim
1. A capacitive touch sensor panel, comprising:
- a substrate formed from a dielectric material;
a first set of non-overlapping traces of conductive material located on a first side of the substrate and arranged along a first dimension of a two-dimensional coordinate system; and
a second set of non-overlapping traces of the conductive material located on a second side of the substrate and arranged along a second dimension of the two-dimensional coordinate system;
wherein the second set of traces are widened as compared to the first set of traces to provide shielding for the first set of traces; and
wherein sensors are formed at locations at which the first set of traces pass over the second set of traces while separated by the dielectric material of the substrate.
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Accused Products
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
20 Claims
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1. A capacitive touch sensor panel, comprising:
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a substrate formed from a dielectric material; a first set of non-overlapping traces of conductive material located on a first side of the substrate and arranged along a first dimension of a two-dimensional coordinate system; and a second set of non-overlapping traces of the conductive material located on a second side of the substrate and arranged along a second dimension of the two-dimensional coordinate system; wherein the second set of traces are widened as compared to the first set of traces to provide shielding for the first set of traces; and wherein sensors are formed at locations at which the first set of traces pass over the second set of traces while separated by the dielectric material of the substrate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile telephone having a capacitive touch sensor panel, the touch sensor panel comprising:
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a substrate formed from a dielectric material; a first set of non-overlapping traces of conductive material located on a first side of the substrate and arranged along a first dimension of a two-dimensional coordinate system; and a second set of non-overlapping traces of the conductive material located on a second side of the substrate and arranged along a second dimension of the two-dimensional coordinate system; wherein the second set of traces are widened as compared to the first set of traces to provide shielding for the first set of traces; and wherein sensors are formed at locations at which the first set of traces pass over the second set of traces while separated by the dielectric material of the substrate.
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8. A digital audio player having a capacitive touch sensor panel, the touch sensor panel comprising:
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a substrate formed from a dielectric material; a first set of non-overlapping traces of conductive material located on a first side of the substrate and arranged along a first dimension of a two-dimensional coordinate system; and a second set of non-overlapping traces of the conductive material located on a second side of the substrate and arranged along a second dimension of the two-dimensional coordinate system; wherein the second set of traces are widened as compared to the first set of traces to provide shielding for the first set of traces; and wherein sensors are formed at locations at which the first set of traces pass over the second set of traces while separated by the dielectric material of the substrate.
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9. A capacitive touch sensor panel, comprising:
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sense traces formed on a first side of a dielectric substrate; and drive traces formed on a second side of the substrate, the drive traces widened as compared to the sense traces to provide shielding for the sense traces; wherein sensors are formed at locations at which the sense traces cross over the drive traces while separated by the dielectric substrate. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for shielding a capacitive touch sensor panel from capacitive coupling of modulated signals, comprising:
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forming a first set of non-overlapping sense traces on a first side of a dielectric substrate; orienting the sense traces along a first dimension of a two-dimensional coordinate system; forming a second set of widened non-overlapping drive traces on a second side of the substrate, the drive traces widened as compared to the sense traces to provide shielding for the sense traces; and orienting the drive traces along a second dimension of the two-dimensional coordinate system to form sensors at locations at which the sense traces cross over the drive traces while separated by the dielectric substrate. - View Dependent Claims (16, 17, 18, 20)
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19. A method for shielding a capacitive touch sensor panel from a source of capacitive coupling, comprising:
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forming a first set of non-overlapping traces on a first side of a dielectric substrate furthest from the source of capacitive coupling, the first set of traces configured for sensing changes in mutual capacitance; orienting the first set of traces along a first dimension of a two-dimensional coordinate system; forming a second set of widened non-overlapping traces on a second side of the substrate closest to the source of capacitive coupling to provide shielding for the first set of traces, the second set of traces configured for being driven by low impedance driver outputs; and orienting the second set of traces along a second dimension of the two-dimensional coordinate system to form sensors at locations at which the first set of traces cross over the second set of traces while separated by the dielectric substrate.
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Specification