Method and apparatus for improved input sensing using a display processor reference signal

摘要

Embodiments of the invention generally provide a method and apparatus that is configured to reduce the effects of interference that is undesirably provided to a transmitter signal that is delivered from a transmitter signal generating device to a sensor processor to determine if an input object is disposed within a touch sensing region of a touch sensing device. In one embodiment, the sensor processor includes a receiver channel that has circuitry that is configured to separately receive a transmitter signal delivered from a display processor and a sensor processor reference signal that is based on a display processor reference signal to reliably sense the presence of an object. Embodiments of the invention described herein thus provide an improved apparatus and method for reliably sensing the presence of an object by a touch sensing device.

主权项

1. An input device, comprising:
a plurality of transmitter electrodes, wherein each of the plurality of transmitter signals comprises at least one common electrode of the display configured to be driven for display updating and capacitive sensing; a plurality of receiver electrodes; a display processor configured to drive at least one transmitter electrode of the plurality transmitter electrodes with a transmitter signal for capacitive sensing; and a sensor processor configured to receive resulting signals with the plurality of receiver electrodes when the at least one transmitter electrode is driven, wherein the sensor processor comprises:
one or more receiver channels, and wherein each of the one or more receiver channels is configured to be coupled to at least one sensor electrode of the plurality of receiver electrodes; and a reference channel configured to provide a reference channel output signal, wherein the reference channel has a first reference channel input port that is configured to receive a reference channel input signal, wherein the reference channel input signal is based on the transmitter signal; and wherein each of the one or more receiver channels is configured to provide an output signal based on at least a portion of the resulting signals and the reference channel output signal.