PROJECTED CAPACITIVE TOUCH-SENSITIVE PANEL
First Claim
1. A touch-sensitive panel, comprising:
- a first sensor layer comprising a first plurality of sense electrodes that are disposed upon and extend in a first direction across a first substrate surface; and
a second sensor layer comprising a second plurality of sense electrodes that are disposed upon and extend in a second direction across a second substrate surface and at least one shield electrode disposed on the second substrate surface;
wherein each sense electrode is operable to generate an electrostatic field used in sensing touch events and wherein the at least one shield electrode is operable to cancel parasitic capacitance between at least one sense electrode in the first plurality of sense electrodes and at least one sense electrode in the second plurality of sense electrodes.
3 Assignments
0 Petitions
Accused Products
Abstract
A touch-sensitive panel is described herein that includes a first sensor layer and a second sensor layer and at least one shield electrode integrated into the first sensor layer and/or the second sensor layer. The at least one shield electrode is operable to cancel parasitic capacitance between at least one sense electrode in the first sensor layer and at least one sense electrode in the second sensor layer. The integrated shield electrode(s) in the first sensor layer and/or the second sensor layer can be used in place of an additional shield layer to combat parasitic capacitance in the touch-sensitive panel, thereby reducing the cost and materials necessary to manufacture the touch-sensitive panel. A touch-screen display that includes such a touch-sensitive panel and a method of operating such a touch-sensitive panel are also described.
-
Citations
32 Claims
-
1. A touch-sensitive panel, comprising:
-
a first sensor layer comprising a first plurality of sense electrodes that are disposed upon and extend in a first direction across a first substrate surface; and a second sensor layer comprising a second plurality of sense electrodes that are disposed upon and extend in a second direction across a second substrate surface and at least one shield electrode disposed on the second substrate surface; wherein each sense electrode is operable to generate an electrostatic field used in sensing touch events and wherein the at least one shield electrode is operable to cancel parasitic capacitance between at least one sense electrode in the first plurality of sense electrodes and at least one sense electrode in the second plurality of sense electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A touch-sensitive panel, comprising:
-
a first plurality of sense electrodes that are formed from a first layer of substantially transparent resistive material and that extend in a first direction; and a second plurality of sense electrodes and at least one shield electrode that are formed from a second layer of substantially transparent resistive material and that extend in a second direction; wherein each sense electrode is operable to generate an electrostatic field used in sensing touch events and wherein the at least one shield electrode is operable to cancel parasitic capacitance between at least one sense electrode in the first plurality of sense electrodes and at least one sense electrode in the second plurality of sense electrodes.
-
-
16. A touch-screen display comprising:
-
a touch-sensitive panel that includes a first sensor layer and a second sensor layer, the first sensor layer comprising a first plurality of sense electrodes that are disposed upon and extend in a first direction across a first substrate surface and the second sensor layer comprising a second plurality of sense electrodes that are disposed upon and extend in a second direction across a second substrate surface and at least one shield electrode disposed on the second substrate surface; a controller connected to the first plurality of sense electrodes, the second plurality of sense electrodes and the at least one shield electrode, the controller being configured to charge the first and second plurality of sense electrodes to generate an electrostatic field around each sense electrode for use in sensing touch events and to charge the at least one shield electrode in a manner that cancels parasitic capacitance between at least one of the first plurality of sense electrodes and at least one of the second plurality of sense electrodes. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
-
30. A method for operating a touch-sensitive panel comprising:
-
charging a first plurality of sense electrodes disposed upon and extending in a first direction across a first substrate surface to generate an electrostatic field around each of the first plurality of sense electrodes for use in sensing touch events; charging a second plurality of sense electrodes disposed upon and extending in a second direction across a second substrate surface to generate an electrostatic field around each of the second plurality of sense electrodes for use in sensing the touch events; and charging at least one shield electrode disposed upon the second substrate surface in a manner that cancels parasitic capacitance between at least one of the first plurality of sense electrodes and at least one of the second plurality of sense electrodes.
-
-
31. A touch-screen display comprising:
-
a touch-sensitive panel that includes a first plurality of sense electrodes that are formed from a first layer of substantially transparent resistive material and that extend in a first direction and a second plurality of sense electrodes and at least one shield electrode that are formed from a second layer of substantially transparent resistive material and that extend in a second direction; a controller connected to the first plurality of sense electrodes, the second plurality of sense electrodes and the at least one shield electrode, the controller being configured to charge the first and second plurality of sense electrodes to generate an electrostatic field around each sense electrode for use in sensing touch events and to charge the at least one shield electrode in a manner that cancels parasitic capacitance between at least one of the first plurality of sense electrodes and at least one of the second plurality of sense electrodes.
-
-
32. A method for operating a touch-sensitive panel comprising:
-
charging a first plurality of sense electrodes that are formed from a first layer of substantially transparent resistive material and that extend in a first direction to generate an electrostatic field around each of the first plurality of sense electrodes for use in sensing touch events; charging a second plurality of sense electrodes that are formed from a second layer of substantially transparent resistive material and that extend in a second direction to generate an electrostatic field around each of the second plurality of sense electrodes for use in sensing the touch events; and charging at least one shield electrode formed from the second layer of substantially transparent resistive material in a manner that cancels parasitic capacitance between at least one of the first plurality of sense electrodes and at least one of the second plurality of sense electrodes.
-
Specification