Touch sensitive devices with composite electrodes
First Claim
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1. A multi-layer touch panel, comprising:
- a first layer comprising a transparent touch surface;
an upper electrode array and a lower electrode array defining an electrode matrix having nodes where the upper and lower electrodes cross over, and wherein the upper electrode array is disposed between the first layer and the lower electrode layer, wherein electrodes of the upper and lower electrode arrays comprise a plurality of composite electrodes comprised of a plurality of metal or metal alloy micro-wire conductors having a cross-sectional dimension of less than 10 microns;
a dielectric disposed between the upper electrode array and the lower electrode array;
wherein electrodes of the upper electrode layer are configured to be more pervious to an electric field than electrodes in the lower electrode layer.
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Abstract
A matrix touch panel having upper and lower electrodes, the upper electrodes being composite electrodes made of a plurality of spaced micro-wires, and allowing, for example, an electric field from lower electrodes to pass between the micro-wires and thereby capacitively couple with a touching object, such as a finger.
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Citations
23 Claims
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1. A multi-layer touch panel, comprising:
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a first layer comprising a transparent touch surface; an upper electrode array and a lower electrode array defining an electrode matrix having nodes where the upper and lower electrodes cross over, and wherein the upper electrode array is disposed between the first layer and the lower electrode layer, wherein electrodes of the upper and lower electrode arrays comprise a plurality of composite electrodes comprised of a plurality of metal or metal alloy micro-wire conductors having a cross-sectional dimension of less than 10 microns; a dielectric disposed between the upper electrode array and the lower electrode array; wherein electrodes of the upper electrode layer are configured to be more pervious to an electric field than electrodes in the lower electrode layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for identifying locations of touches or near-touches on a touch sensitive apparatus, comprising:
sensing, with an electronic controller, a value indicative of the change of mutual capacitance between an overlapping first electrode and a second electrode disposed in a matrix-type touch sensor, the change in mutual capacitance induced by the presence of an object proximate to the touch sensor, wherein the first and second electrodes are metal or metal alloy electrodes comprised of a plurality of micro-wire conductors having an average cross-sectional dimension of less than 10 microns;
wherein the electrode positioned closer to the touches or near-touches defines an upper electrode, and the other electrode defines a lower electrode, and wherein the upper electrode is more pervious to an electric field than the lower electrode.- View Dependent Claims (19, 20, 21, 22, 23)
Specification