Routing trace compensation
First Claim
1. A method of operating a capacitive input device,wherein said capacitive input device comprises:
- first and second pluralities of sensor electrodes disposed in a first region of a substrate, wherein said first region is configured to overlap a display screen;
at least one routing trace disposed in a second region of said substrate and ohmically coupled to a sensor electrode of one of said first and second pluralities of sensor electrodes and also to a processing system, wherein said second region comprises a non-display screen overlapping portion of said substrate; and
a compensation trace disposed in said second region of said substrate and ohmically coupled to said processing system, said compensation trace being substantially parallel and proximate to said at least one routing trace and having substantially the same length along a side edge of said first region as said at least one routing trace, wherein said compensation trace is not ohmically coupled to any sensor electrode located in said first region; and
said method comprising;
when performing transcapacitive sensing with said capacitive input device, driving a voltage on said compensation trace; and
when performing absolute capacitive sensing with said capacitive input device;
receiving signals on said compensation trace to measure a capacitance related to an input object in said second region; and
utilizing said received signals to compensate for sensitivity of said at least one routing trace to said input object in said second region.
3 Assignments
0 Petitions
Accused Products
Abstract
A capacitive input device includes first and second pluralities of sensor electrodes disposed in a first region of a substrate. The first and second pluralities of sensor electrodes are substantially orthogonal to one another. The first region is configured to overlap a display screen. At least one routing trace is disposed in a second region of the substrate and is ohmically coupled to a sensor electrode of one of the first and second pluralities of sensor electrodes and also to a processing system. The second region comprises a non-display screen overlapping portion of the substrate. A compensation trace is disposed in the second region and ohmically coupled to the processing system. The compensation trace has substantially the same length as and is substantially parallel and proximate to the at least one routing trace. The compensation trace is not ohmically coupled to any sensor electrode located in the first region.
23 Citations
14 Claims
-
1. A method of operating a capacitive input device,
wherein said capacitive input device comprises: -
first and second pluralities of sensor electrodes disposed in a first region of a substrate, wherein said first region is configured to overlap a display screen; at least one routing trace disposed in a second region of said substrate and ohmically coupled to a sensor electrode of one of said first and second pluralities of sensor electrodes and also to a processing system, wherein said second region comprises a non-display screen overlapping portion of said substrate; and a compensation trace disposed in said second region of said substrate and ohmically coupled to said processing system, said compensation trace being substantially parallel and proximate to said at least one routing trace and having substantially the same length along a side edge of said first region as said at least one routing trace, wherein said compensation trace is not ohmically coupled to any sensor electrode located in said first region; and said method comprising; when performing transcapacitive sensing with said capacitive input device, driving a voltage on said compensation trace; and when performing absolute capacitive sensing with said capacitive input device; receiving signals on said compensation trace to measure a capacitance related to an input object in said second region; and utilizing said received signals to compensate for sensitivity of said at least one routing trace to said input object in said second region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A processing system for a capacitive input device,
wherein said capacitive input device comprises: -
first and second pluralities of sensor electrodes disposed in a first region of a substrate, wherein said first region is configured to overlap a display screen; at least one routing trace disposed in a second region of said substrate and ohmically coupled to a sensor electrode of one of said first and second pluralities of sensor electrodes and also to a processing system, wherein said second region comprises a non-display screen overlapping portion of said substrate; and a compensation trace disposed in said second region of said substrate and ohmically coupled to said processing system, said compensation trace being substantially parallel and proximate to said at least one routing trace and having substantially the same length along a side edge of said first region as said at least one routing trace, wherein said compensation trace is not ohmically coupled to any sensor electrode; and said processing system comprising; sensor circuitry configured to drive a voltage on said compensation trace when performing transcapacitive sensing with said first and second pluralities of sensor electrodes; said sensor circuitry configured to receive signals on said compensation trace to measure a capacitance related to an input object in said second region when performing absolute capacitive sensing with said first and second pluralities of electrodes; and computation circuitry configured to utilize said received signals to compensate for sensitivity of said at least one routing trace to said input object in said second region. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification