Trace shielding for input devices
Embodiments of the present invention generally provide shield electrodes for shielding one or more conductive routing traces from one or more receiver electrodes in an input device comprising a display device integrated with a sensing device to reduce the capacitive coupling between the conductive routing traces and the receiver electrodes. The shield electrode may be configured to reduce the effect of an input object on the capacitive coupling between the conductive routing traces and the receiver electrodes. In other embodiments, end portions of common electrodes shield the receiver electrodes from the conductive routing traces, thereby reducing the capacitive coupling between the receiver electrodes and the conductive routing traces.
1. A touch screen device with an integrated capacitive sensing device comprising:
a display device;
a plurality of common electrodes disposed in the display device and configured for updating the display device and for transmitting transmitter signals for capacitive sensing;
a plurality of receiver electrodes; and
a plurality of conductive routing traces coupled to the plurality of common electrodes, the conductive routing traces shielded from the plurality of receiver electrodes by end portions of the plurality of common electrodes in a manner that reduces a capacitive coupling between the conductive routing traces and the receiver electrodes.
2. The touch screen device of claim 1 , wherein the plurality of conductive routing traces are configured for driving the plurality of common electrodes.
3. The touch screen device of claim 1 , wherein the plurality of common electrodes and the plurality of conductive routing traces and disposed on a thin-film transistor (TFT) substrate layer of the display device, and
the plurality of receiver electrodes is disposed below a lens of the display device.
4. The touch screen device of claim 1 , wherein the plurality of common electrodes is configured to reduce the effect of an input object on the capacitive coupling between the conductive routing traces and the receiver electrodes.
5. The touch screen device of claim 1 , wherein the end portions of the plurality of common electrodes are disposed between the plurality of receiver electrodes and the plurality of conductive routing traces, and
each of the end portions of the plurality of common electrodes is coupled with a respective one of the plurality of conductive routing traces through a via.
6. The touch screen device of claim 1 , wherein the plurality of common electrodes further comprises apertures formed therethrough and disposed over the plurality of conductive routing traces.
7. The touch screen device of claim 6 , wherein the apertures are configured to decrease the capacitive coupling between the plurality of common electrodes and the plurality of conductive routing traces.
8. A system for capacitive sensing in a display device comprising:
a plurality of common electrodes configured for display updating and for capacitive sensing;
a plurality of conductive routing traces coupled to the plurality of common electrodes;
a driver module coupled to the plurality of conductive routing traces and configured to drive transmitter signals onto the plurality of common electrodes;
a plurality of receiver electrodes shielded from the plurality of conductive routing traces by end portions of the plurality of common electrodes in a manner that reduces influence of a presence of an input object on capacitive coupling between the plurality of receiver electrodes and conductive routing traces; and
a receiver module coupled to the plurality of receiver electrodes and configured to receive resulting signals with the receiver electrodes.
9. The system of claim 8 , wherein the end portions of the plurality of common electrodes are positioned between the plurality of receiver electrodes and the plurality of conductive routing traces.
10. The system of claim 9 , wherein each of the end portions of the plurality of common electrodes are coupled with a respective one of the plurality of conductive routing traces through a via.
11. The touch screen device of claim 1 , further comprising an aperture formed in the end portions of the plurality of common electrodes.
12. The touch screen device of claim 11 , further comprising an insulating material disposed in the apertures.