Double-sided touch-sensitive panel with shield and drive combined layer
First Claim
1. A touch sensor panel, comprising:
- a first set of co-planar traces of conductive material, a total surface area of the first set of co-planar traces defining a first surface area; and
a second set of co-planar traces of the conductive material formed on a different plane from the first set of co-planar traces, the total surface area of the second set of co-planar traces defining a second surface area;
wherein the second set of co-planar traces are configured for having the second surface area and for being held at a DC voltage or stimulated with a stimulation voltage to provide shielding from electrical interference for the first set of co-planar 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
25 Claims
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1. A touch sensor panel, comprising:
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a first set of co-planar traces of conductive material, a total surface area of the first set of co-planar traces defining a first surface area; and a second set of co-planar traces of the conductive material formed on a different plane from the first set of co-planar traces, the total surface area of the second set of co-planar traces defining a second surface area; wherein the second set of co-planar traces are configured for having the second surface area and for being held at a DC voltage or stimulated with a stimulation voltage to provide shielding from electrical interference for the first set of co-planar traces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A touch sensor panel, comprising:
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a plurality of sense traces of conductive material having a total surface area defining a first surface area; and a plurality of drive traces of the conductive material spatially separated from the plurality of sense traces, the plurality of drive traces having a total surface area defining a second surface area; wherein the plurality of drive traces are configured for having the second surface area and for being held at a DC voltage or stimulated with a stimulation voltage to provide shielding from electrical interference for the plurality of sense traces. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. 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 a total surface area defining a second surface area and the plurality of first traces having a total surface area defining a first surface area; and selecting the second surface area and biasing the plurality of second traces with a DC voltage or a stimulation voltage to provide shielding from electrical interference for the plurality of first traces. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification