Capacitive Touch Screen with Noise Suppression
First Claim
1. A capacitive touch sensor comprising a touch sensitive panel having a plurality of drive electrodes arranged on one side of a substrate in a first layer and a plurality of sense electrodes arranged on the other side of the substrate in a second layer so that the sense electrodes cross the drive electrodes at a plurality of intersections offset from each other by the thickness of the substrate, wherein the drive electrodes substantially entirely cover the first layer with individual ones of the drive electrodes being separated from neighboring drive electrodes by small gaps.
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Accused Products
Abstract
A capacitive touch sensor wherein the touch sensitive panel has drive electrodes arranged on the lower side of a substrate and sense electrodes arranged on the upper side. The drive electrodes are shaped and dimensioned to substantially entirely cover the touch sensitive area with individual drive electrodes being separated from each other by small gaps, the gaps being so small as to be practically invisible. The near blanket coverage by the drive electrodes also serves to screen out interference from noise sources below the drive electrode layer, such as drive signals for an underlying display, thereby suppressing noise pick-up by the sense electrodes that are positioned above the drive electrodes.
175 Citations
20 Claims
- 1. A capacitive touch sensor comprising a touch sensitive panel having a plurality of drive electrodes arranged on one side of a substrate in a first layer and a plurality of sense electrodes arranged on the other side of the substrate in a second layer so that the sense electrodes cross the drive electrodes at a plurality of intersections offset from each other by the thickness of the substrate, wherein the drive electrodes substantially entirely cover the first layer with individual ones of the drive electrodes being separated from neighboring drive electrodes by small gaps.
- 17. A touch sensitive panel for a capacitive touch sensor, the touch sensitive panel having a plurality of drive electrodes arranged in a first layer and a plurality of sense electrodes arranged in a second layer so that the sense electrodes cross the drive electrodes at a plurality of intersections offset from each other, wherein the drive electrodes substantially entirely cover the first layer with individual ones of the drive electrodes being separated from neighboring drive electrodes by small gaps.
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20. A method of manufacturing a touch sensitive panel for a capacitive touch sensor comprising:
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providing a substrate having first and second sides; depositing on the first side of the substrate a first layer of conductive material in a first pattern forming a plurality of drive electrodes, wherein the drive electrodes substantially entirely cover the first layer with individual ones of the drive electrodes being separated from neighboring drive electrodes by small gaps; and depositing on the second side of the substrate a second layer of conductive material in a second pattern forming a plurality of sense electrodes so that the sense electrodes cross the drive electrodes at a plurality of intersections offset from each other by the thickness of the substrate.
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Specification