Input sensing using lower-order CDM

Patent metadata

Field	Value
Publication number	US-10459581-B2
Application number	US-201715720817-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Sep 29, 2017
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A method for performing input sensing using an input device includes: receiving, at a sensing region of the input device, an input; obtaining, via receivers of the input device, measurements corresponding to the input, wherein obtaining the measurements comprises: separately driving multiple subsets of transmitters of the input device, and obtaining measurements corresponding to each separately-driven subset of transmitters via the receivers, wherein each separately-driven subset of transmitters comprises a plurality of non-contiguous transmitters; and generating, by a processing system of the input device, an image of the input based on the obtained measurements.

First claim

The invention claimed is:

1. A method for performing input sensing using an input device, the method comprising:
receiving, at a sensing region of the input device, an input, wherein the input device comprises a plurality of transmitters and a plurality of receivers;
obtaining, via the plurality of receivers of the input device, measurements corresponding to the input, wherein obtaining the measurements comprises: separately driving multiple subsets of the plurality of transmitters, and obtaining measurements corresponding to each separately-driven subset of transmitters via the plurality of receivers, wherein each separately-driven subset of transmitters comprises a plurality of non-contiguous transmitters being driven over a plurality of iterations based on a drive matrix while all other transmitters of the plurality of transmitters are grounded or held at a low reference potential, and wherein at least one transmitter which is grounded or held at a low reference potential is disposed between two non-contiguous transmitters of each separately-driven subset of transmitters; and
generating, by a processing system of the input device, an image of the input based on the obtained measurements corresponding to the input.

2. The method according to claim 1 , wherein the drive matrix for each separately-driven subset of transmitters is a code division multiplexing (CDM) drive matrix.

3. The method according to claim 2 , wherein generating the image utilizes an inverse or transpose of the CDM drive matrix for each separately-driven subset of transmitters to obtain image information via decoding the obtained measurements corresponding to each separately-driven subset of transmitters.

4. The method according to claim 2 , wherein the same CDM drive matrix is used for multiple separately-driven subsets of transmitters.

5. The method according to claim 2 , wherein all iterations for a first separately-driven subsets of transmitters are performed before any iterations for a second separately-driven subsets of transmitters are performed.

6. The method according to claim 1 , wherein the transmitters and the receivers are orthogonal to one another.

7. The method according to claim 1 , wherein the input is a biometric object and the generated image comprises features of the biometric object.

8. The method according to claim 1 , wherein the input device is a transcapacitive input device, the plurality of transmitters are transmitter electrodes, and the plurality of receivers are receiver electrodes.

9. The method according to claim 1 , wherein the input device is an acoustic or ultrasonic input device.

10. The method according to claim 1 , wherein each non-contiguous transmitter for each separately-driven subset of transmitters is not adjacent to any other non-contiguous transmitter in the respective separately-driven subset of transmitters.

11. An input device, comprising:
a surface corresponding to a sensing region, wherein the sensing region is configured to receive an input;
a plurality of transmitters configured to be driven with transmitter signals; and
a plurality of receivers configured to obtain measurements corresponding to the input, wherein obtaining the measurements comprises: obtaining measurements corresponding to separately-driven subsets of transmitters via the receivers, wherein each separately-driven subset of transmitters comprises a plurality of non-contiguous transmitters being driven over a plurality of iterations based on a drive matrix while all other transmitters of the plurality of transmitters are grounded or held at a low reference potential, and wherein at least one transmitter which is grounded or held at a low reference potential is disposed between two non-contiguous transmitters of each separately-driven subset of transmitters; and
a processing system, configured to generate an image of the input based on the obtained measurements.

12. The input device according to claim 11 , wherein the drive matrix for each separately-driven subset of transmitters is a code division multiplexing (CDM) drive matrix.

13. The input device according to claim 12 , wherein generating the image utilizes an inverse or transpose of the CDM drive matrix for each separately-driven subset of transmitters to obtain image information via decoding the obtained measurements corresponding to each separately-driven subset of transmitters.

14. The input device according to claim 11 , wherein the input device is a transcapacitive input device, the transmitters are transmitter electrodes, and the receivers are receiver electrodes.

15. A non-transitory computer-readable medium having processor-executable instructions stored thereon for performing input sensing using an input device, the processor-executable instructions, when executed, facilitating performance of the following:
obtaining, via receivers of the input device, measurements corresponding to an input received at a sensing region of the input device, wherein obtaining the measurements comprises: separately driving multiple subsets of transmitters of the input device, and obtaining measurements corresponding to each separately-driven subset of transmitters via the receivers, wherein each separately-driven subset of transmitters comprises a plurality of non-contiguous transmitters being driven over a plurality of iterations based on a drive matrix while all other transmitters of the plurality of transmitters are grounded or held at a low reference potential, and wherein at least one transmitter which is grounded or held at a low reference potential is disposed between two non-contiguous transmitters of each separately-driven subset of transmitters; and
generating an image of the input based on the obtained measurements.

16. The non-transitory computer-readable medium according to claim 15 , wherein the drive matrix for each separately-driven subset of transmitters is a code division multiplexing (CDM) drive matrix.

17. The non-transitory computer-readable medium according to claim 16 , wherein generating the image utilizes an inverse or transpose of the CDM drive matrix for each separately-driven subset of transmitters to obtain image information via decoding the obtained measurements corresponding to each separately-driven subset of transmitters.

18. The non-transitory computer-readable medium according to claim 15 , wherein the input device is a transcapacitive input device, the transmitters are transmitter electrodes, and the receivers are receiver electrodes.

Assignees

• Synaptics Inc

Inventors

• Amer Nooreldin
• Hinterberger David

Classifications

• G06F3/043

  using propagating acoustic waves · CPC title

• 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

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06K9/0002

  Physics · mapped topic