Multi-frequency-region touch sensing
AssigneeSynaptics Incorporated
InventorsGuozhong Shen, Chunbo Liu
Life of this patent
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Abstract
An input device includes transmitter electrodes disposed in a sensing region of the input device, a receiver electrode in the sensing region, and a processing system. The processing system includes demodulators, and is configured to simultaneously drive at least a subset of the transmitter electrodes using a multitude of transmitter signals with unique frequencies. The processing system is also configured to receive, on the receiver electrode, a resulting signal, and demodulate, using the plurality of demodulators, the resulting signal to generate a multitude, of sensing signals. Each of the of the demodulators operates on a different frequency of the unique frequencies.
Claims18
An input device, comprising:
- transmitter electrodes disposed in a plurality of separate frequency regions in a sensing region of the input device, wherein each of the plurality of separate frequency regions comprises a plurality of the transmitter electrodes;
- a receiver electrode in the sensing region;
- and
- a processing system comprising a plurality of demodulators, the processing system configured to:
- simultaneously drive at least two of the plurality of transmitter electrodes in each of the plurality of separate frequency regions using a plurality of transmitter signals with unique frequencies;
- receive, on the receiver electrode, a resulting signal;
- and
- demodulate, using the plurality of demodulators, the resulting signal to generate a plurality of sensing signals,
- wherein each of the plurality of demodulators operates on a different frequency of the unique frequencies, and
- wherein each of the plurality of separate frequency regions is specific to one of the unique frequencies.
A processing system for an input device,
- the processing system comprising a plurality of demodulators and configured to:
- simultaneously drive at least two of each of a plurality of transmitter electrodes disposed in a plurality of separate frequency regions in a sensing region of the input device using a plurality of transmitter signals with unique frequencies, wherein each of the plurality of separate frequency regions comprises a plurality of transmitter electrodes;
- receive, on a receiver electrode in the sensing region, a resulting signal;
- and
- demodulate, using the plurality of demodulators, the resulting signal to generate a plurality of sensing signals,
- wherein each of the plurality of demodulators operates on a different frequency of the unique frequencies, and
- wherein each of the plurality of separate frequency regions is specific to one of the unique frequencies.
A method for operating an input device, the method comprising:
- simultaneously driving at least two of each of a plurality of transmitter electrodes disposed in a plurality of separate frequency regions in a sensing region of the input device using a plurality of transmitter signals with unique frequencies, wherein each of the plurality of separate frequency regions comprises a plurality of transmitter electrodes;
- receiving, on a receiver electrode, a resulting signal,
- wherein the receiver electrode is disposed in the sensing region of the input device;
- demodulating, using a plurality of demodulators, the resulting signal to generate a plurality of sensing signals,
- wherein each of the plurality of demodulators operates on a different frequency of the unique frequencies;
- and
- wherein each of the plurality of separate frequency regions is specific to one of the unique frequencies;
- and
- performing a touch sensing, using the resulting signal.
Dependencies are inferred from the claim text.