Touch Screen Element
First Claim
1. A pen-less two-dimensional capacitive transducer, for detecting touch or proximity, comprising:
- a first electrode set composed of a plurality of electrodes arranged substantially in a parallel array along a first axis, the electrodes being connected to each other via a resistive path, and having a first connection on a first one of said electrodes and a second connection on a second one of said electrodes;
a second electrode set composed of a plurality of gradient field generating shaped electrodes arranged substantially in a parallel array along the first axis and each extending along a second axis transverse to the first axis, the electrodes of the second electrode set being galvanically connected to each other and having one connection;
a third electrode set composed of a plurality of gradient field generating shaped electrodes arranged substantially in a parallel array along the first axis and each extending along the second axis, the electrodes of the third electrode set being galvanically connected to each other and having one connection;
wherein the electrodes of the second and third electrode sets are arranged in co-extending pairs to provide ratiometric capacitive signals,wherein the electrodes of the second and third electrode sets are shaped and dimensioned to provide respective capacitive signals that allow position of touch to be resolved along the second axis by ratiometric analysis of the respective capacitive signals, andwherein the resistive path interconnecting the electrodes of the first electrode set is arranged to provide a capacitive signal that allows position of touch to be resolved along the first axis.
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Accused Products
Abstract
A capacitive two-dimensional (2D) touch panel has three sets of interleaved electrodes. A first set of electrodes is spaced apart along the y-direction and these are galvanically connected to each other by a resistive strip connected at either end to a connection line. A second set of electrodes is also arrayed along the y-direction and these are galvanically connected to each other via a notionally non-resistive first connection. A third set of electrodes is also arrayed along the y-direction and these are galvanically connected to each other via a notionally non-resistive second connection. The second and third sets of electrodes are interleaved without galvanic cross-conduction to provide a gradient along the x-direction to resolve touch position in the x-direction. The first set of electrodes resolves touch position along the y-direction. Passive or active capacitive sensing techniques may be used to acquire the position information from the 2D touch panel.
357 Citations
13 Claims
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1. A pen-less two-dimensional capacitive transducer, for detecting touch or proximity, comprising:
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a first electrode set composed of a plurality of electrodes arranged substantially in a parallel array along a first axis, the electrodes being connected to each other via a resistive path, and having a first connection on a first one of said electrodes and a second connection on a second one of said electrodes; a second electrode set composed of a plurality of gradient field generating shaped electrodes arranged substantially in a parallel array along the first axis and each extending along a second axis transverse to the first axis, the electrodes of the second electrode set being galvanically connected to each other and having one connection; a third electrode set composed of a plurality of gradient field generating shaped electrodes arranged substantially in a parallel array along the first axis and each extending along the second axis, the electrodes of the third electrode set being galvanically connected to each other and having one connection; wherein the electrodes of the second and third electrode sets are arranged in co-extending pairs to provide ratiometric capacitive signals, wherein the electrodes of the second and third electrode sets are shaped and dimensioned to provide respective capacitive signals that allow position of touch to be resolved along the second axis by ratiometric analysis of the respective capacitive signals, and wherein the resistive path interconnecting the electrodes of the first electrode set is arranged to provide a capacitive signal that allows position of touch to be resolved along the first axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification