SURFACE CAPACITANCE WITH AREA GESTURES
First Claim
1. A method for measuring the position of a plurality of pointing objects on a surface capacitance touch panel (surface cap panel), said method comprising the steps of:
- 1) providing a surface cap panel comprised of an insulating substrate, a resistive material disposed on the substrate, and a dielectric disposed on the resistive material;
2) connecting a first capacitor to opposite edges of the surface cap panel while simultaneously connecting a second capacitor to different opposite edges and measuring current across the surface cap panel using a current measuring circuit in
1) different directions across the surface cap panel, and
2) for different time apertures; and
3) triangulating a position of the multiple pointing objects using the measurements obtained in step
2).
1 Assignment
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Accused Products
Abstract
A surface capacitance touch sensitive surface (or “surface cap panel”) suitable for use in a touch screen or touchpad, wherein the surface cap panel has a substantially even coating of a conductive material on a non-conductive substrate and then covering the conductive material with a dielectric material, wherein a novel current measuring circuit reduces the effect of stray capacitance on the accuracy of a current measurement so that the relative X and Y position of an object on the surface cap panel can be determined using simple ratio equations, and wherein measuring the charge transfer rate in a measuring circuit, in addition to the total charge transfer for each toggle event, enables the location of two objects to be identified on the surface cap panel, wherein the charge transfer rate is used to determine the distance between two points of contact on the surface cap panel, and wherein height and width information related to the distance between the two points of contact can now be determined by doubling the number of electrodes at the corners of the surface cap panel.
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Citations
9 Claims
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1. A method for measuring the position of a plurality of pointing objects on a surface capacitance touch panel (surface cap panel), said method comprising the steps of:
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1) providing a surface cap panel comprised of an insulating substrate, a resistive material disposed on the substrate, and a dielectric disposed on the resistive material; 2) connecting a first capacitor to opposite edges of the surface cap panel while simultaneously connecting a second capacitor to different opposite edges and measuring current across the surface cap panel using a current measuring circuit in
1) different directions across the surface cap panel, and
2) for different time apertures; and3) triangulating a position of the multiple pointing objects using the measurements obtained in step
2). - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. The method as defined in claim 8 wherein the method further comprises the step of refreshing the first capacitor and the second capacitor to a known voltage in order to maintain the voltage gradient across the surface cap panel.
Specification