Multi-frequency single-burst driving scheme for presence detection

Patent metadata

Field	Value
Publication number	US-12535912-B2
Application number	US-202418990232-A
Country	US
Kind code	B2
Filing date	Dec 20, 2024
Priority date	Jun 30, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

An input device includes a plurality of sensor electrodes and a processing system connected to the plurality of sensor electrodes. The plurality of sensor electrodes includes transmitter electrodes and receiver electrodes. The processing system is configured to perform single-burst multi-frequency presence detection, wherein performing single-burst multi-frequency presence detection includes: driving the transmitter electrodes of the plurality of electrodes with transmitter signals having different frequencies; obtaining resulting signals via the receiver electrodes of the plurality of electrodes based on the transmitter signals driven onto the transmitter electrodes; and detecting whether an input object is present within a sensing region of the input device based on the obtained resulting signals.

First claim

The invention claimed is:

1 . An input device, comprising:
a sensing region including a plurality of electrodes; and a processing system coupled to the sensing region, wherein the processing system is configured to perform single-burst multi-frequency presence detection, wherein performing single-burst multi-frequency presence detection includes:
driving transmitter electrodes of the plurality of electrodes with transmitter signals having at least three different frequencies with at least two phases corresponding to each of the at least three different frequencies;
obtaining resulting signals via receiver electrodes of the plurality of electrodes based on the transmitter signals driven onto the transmitter electrodes; and
detecting whether an input object is present within the sensing region of the input device based on the obtained resulting signals.

2 . The input device according to claim 1 , wherein the transmitter electrodes, while being driven with the transmitter signals, comprise at least three single-frequency regions, wherein the at least three single-frequency regions comprise:
a first single-frequency region comprising at least two adjacent transmitter electrodes driven with transmitter signals having a first frequency and a first phase for the first frequency; a second single-frequency region comprising at least two adjacent transmitter electrodes driven with transmitter signals having a second frequency and a first phase for the second frequency; and a third single-frequency region comprising at least two adjacent transmitter electrodes driven with transmitter signals having a third frequency and a first phase for the third frequency.

3 . The input device according to claim 2 , wherein the transmitter electrodes, while being driven with the transmitter signals, comprise at least two multi-frequency regions, wherein the at least two multi-frequency regions comprise a first multi-frequency region disposed between the first and second single-frequency regions, and a second multi-frequency region disposed between the second and third single-frequency regions; and
wherein each of the at least two multi-frequency regions comprises at least two adjacent electrodes, wherein each respective pair of adjacent electrodes among the at least two adjacent electrodes is driven with different frequencies.

4 . The input device according to claim 3 , wherein the first multi-frequency region comprises at least two out of the following:
a transmitter electrode driven with a transmitter signal having the first frequency and a second phase for the first frequency; a transmitter electrode driven with a transmitter signal having the second frequency and a second phase for the second frequency; and a transmitter electrode driven with a transmitter signal having the third frequency and a second phase for the third frequency.

5 . The input device according to claim 3 , wherein, while the transmitter electrodes are being driven with the transmitter signals, there is no pair of adjacent transmitter electrodes in the sensing region that have the same frequency and opposite phases.

6 . The input device according to claim 3 , wherein, while the transmitter electrodes are being driven with the transmitter signals, there is no pair of adjacent transmitter electrodes in the sensing region which is complementary to another pair of adjacent transmitter electrodes in the sensing region.

7 . The input device according to claim 3 , wherein the transmitter electrodes, while being driven with the transmitter signals, comprises a first pair of adjacent transmitter electrodes respectively driven with a first pair of transmitter signals comprised of:
a first transmitter signal having the first frequency and a first phase for the first frequency, and a second transmitter signal having the second frequency and a second phase for the second frequency; and wherein, while the transmitter electrodes are being driven with the transmitter signals, there is no pair of adjacent transmitter electrodes in the sensing region driven with a second pair of transmitter signals comprised of: a first transmitter signal having the first frequency and a second phase for the first frequency, and a second transmitter signal having the second frequency and a first phase for the second frequency.

8 . An input device, comprising:
a sensing region including a plurality of electrodes; and a processing system coupled to the sensing region, wherein the processing system is configured to perform single-burst multi-phase presence detection, wherein performing single-burst multi-phase presence detection includes:
driving transmitter electrodes of the plurality of electrodes with transmitter signals having at least four phases, wherein the at least four phases include at least two pairs of opposing phases;
obtaining resulting signals via receiver electrodes of the plurality of electrodes based on the transmitter signals driven onto the transmitter electrodes; and
detecting whether an input object is present within the sensing region of the input device based on the obtained resulting signals.

9 . The input device according to claim 8 , wherein the transmitter electrodes, while being driven with the transmitter signals, comprise at least two single-phase regions, wherein the at least two single-phase regions comprise:
a first single-phase region comprising at least two adjacent transmitter electrodes driven with transmitter signals having a first phase; and a second single-phase region comprising at least two adjacent transmitter electrodes driven with transmitter signals having a second phase.

10 . The input device according to claim 9 , wherein the transmitter electrodes, while being driven with the transmitter signals, comprise at least two multi-phase regions; and
wherein each of the at least two multi-phase regions comprises at least two adjacent electrodes, wherein each respective pair of adjacent electrodes among the at least two adjacent electrodes is driven with transmitter signals having different phases.

11 . The input device according to claim 10 , wherein a first multi-phase regions of the at least two multi-phase regions comprises:
a transmitter electrode driven with a transmitter signal having a third phase, wherein the third phase is opposite the first phase; and a transmitter electrode driven with a transmitter signal having a fourth phase, wherein the fourth phase is opposite the second phase.

12 . The input device according to claim 11 , wherein the transmitter electrodes, while being driven with the transmitter signals, comprises a first pair of adjacent transmitter electrodes respectively driven with a first pair of transmitter signals comprised of:
a first transmitter signal having a first frequency and the first phase, and a second transmitter signal having the first frequency and the fourth phase; and wherein, while the transmitter electrodes are being driven with the transmitter signals, there is no pair of adjacent transmitter electrodes in the sensing region driven with a second pair of transmitter signals comprised of: a first transmitter signal having the first frequency and the third phase, and a second transmitter signal having the first frequency and the second phase.

13 . The input device according to claim 10 , wherein, while the transmitter electrodes are being driven with the transmitter signals, there is no pair of adjacent transmitter electrodes in the sensing region that have a same frequency and opposite phases.

14 . The input device according to claim 10 , wherein, while the transmitter elect

Assignees

• Synaptics Inc

Inventors

• Dattalo Tracy Scott
• Shen Guozhong
• Li Xinyu

Classifications

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title