Using hybrid signal for large input object rejection

Patent metadata

Field	Value
Publication number	US-9952709-B2
Application number	US-201514966979-A
Country	US
Kind code	B2
Filing date	Dec 11, 2015
Priority date	Dec 11, 2015
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A processing system for hybrid rejection includes a sensor module coupled to sensor electrodes, and configured to acquire sensing data using the sensor electrodes. The system further includes a determination module configured to obtain a capacitive image of a sensing region based on the sensing data, determine a input object set in the sensing region using the capacitive image, obtain a profile of the sensing region based on the sensing data, and determine a contiguous region width of a contiguous region in the profile. The contiguous region corresponds to a input object in the input object set. The determination module is further configured to filter the input object from the input object set based on the contiguous region width satisfying a size threshold to obtain a filtered input object set, and process the filtered input object set.

First claim

What is claimed is:

1. A processing system for hybrid rejection comprising:
a sensor module coupled to a plurality of sensor electrodes, and configured to:
acquire, using a first sensing technique, first sensing data, wherein the first sensing technique comprises:
driving a first subset of the plurality of sensor electrodes with a plurality of transmitter signals, and
receiving, based on the plurality of transmitter signals, a first plurality of resulting signals from a second subset of the plurality of sensor electrodes, and

acquire second sensing data using a second sensing technique and a third subset of the plurality of sensor electrodes, wherein the second sensing technique is different from the first sensing technique; and

a determination module configured to:
obtain a capacitive image of a sensing region based on the first sensing data,
determine a first input object set in the sensing region using the capacitive image,
obtain a first capacitive profile of the sensing region based on the second sensing data, wherein the first capacitive profile corresponds to changes in capacitive coupling between the first input object set and the third subset of the plurality of sensor electrodes,
determine a first contiguous region width of a first contiguous region in the first capacitive profile, the first contiguous region corresponding to a first input object in the first input object set,
filter the first input object from the first input object set based on the first contiguous region width satisfying a size threshold to obtain a first filtered input object set, and
process the first filtered input object set.

2. The processing system of claim 1 , wherein the determination module is further configured to:
determine a second contiguous region width of a second contiguous region in a second capacitive profile, wherein the second capacitive profile is along a different axis than the first capacitive profile, and wherein the second contiguous region and the first contiguous region are for the first input object,
wherein filtering the first input object is further based on the second contiguous region width and the size threshold, wherein the size threshold is a function of the first contiguous region width and the second contiguous region width.

3. The processing system of claim 1 , wherein acquiring the first sensing data comprises receiving the first resulting signals from the second subset of the plurality of sensor electrodes while modulating the second subset of the plurality of sensor electrodes.

4. The processing system of claim 1 , wherein the sensor module is further configured to receive a second plurality of resulting signals from the first subset while the first subset are driven with modulated signals, and wherein the determination module is further configured to:
obtain a second capacitive profile of a sensing region based on the second plurality of resulting signals;
determine a second contiguous region width of a second contiguous region in the second capacitive profile, and wherein the second contiguous region and the first contiguous region are for the first input object, and
determine that the second contiguous region width is less than the size threshold.

5. The processing system of claim 1 , wherein the determination module is further configured to:
determine a second input object set in the sensing region,
obtain a second capacitive profile and third capacitive profile of the sensing region,
determine an aggregated size of a second contiguous region in the second capacitive profile and the third capacitive profile, the second contiguous region corresponding to a second input object in the second input object set,
filter the second input object from the second input object set based on the aggregated size being greater than an aggregated threshold to obtain a second filtered input object set, and
process the second filtered input object set.

6. The processing system of claim 1 , wherein the first input object set comprises a second input object, the second input object being a stylus.

7. The processing system of claim 1 , wherein determining the contiguous region width comprises:
obtain a first tuple comprising a location and a peak value of a peak in the contiguous region,
determine, for a first side of the contiguous region, a first edge measurement location in the contiguous region, the first edge measurement location having a first measured value adjacent to a first intersection with a width base level, the first measured value greater than a width base level value of the width base level,
obtain a second tuple comprising the first edge measurement location and the first measured value,
determining a first line connecting the first tuple to the second tuple,
determining the first intersection with the width base level using the width base level value and the first line, and
determining the contiguous region width as a distance between the first intersection and a second intersection with the width base level.

8. The processing system of claim 7 , wherein determining the contiguous region width comprises:
determine, for a second side of the contiguous region, a second edge measurement location in the contiguous region, the second edge measurement location having a second measured value adjacent to the second intersection with the width base level, the second measured value greater than the width base level value,
obtain a third tuple comprising the second edge measurement location and the second measured value,
determining a second line connecting the first tuple to the third tuple,
determining the second intersection with the width base level using the width base level value and the second line.

9. The processing system of claim 1 , performing interpolation using at least two measured values in the first capacitive profile to identify a first intersection with a width base level, and determining the contiguous region width as a distance between the first intersection and a second intersection with the width base level.

10. The processing system of claim 1 , wherein the determination module is further configured to, prior to filtering the first input object from the first input object set, classifying each input object in the first input object set using the capacitive image.

11. The processing system of claim 1 , wherein the determination module is further configured to, concurrently with filtering the first input object from the first input object set, classifying each input object in the first input object set using the capacitive image.

12. The processing system of claim 1 , wherein the determination module is further configured to:
combine, to create the first contiguous region, a second contiguous region with a third contiguous region.

13. The processing system of claim 1 , wherein the determination module is further configured to:
determine that the first contiguous region corresponds to a distinct input object from an input object of a second contiguous region based on the first contiguous region comprising a peak value that is more than a threshold difference than a peak value of the second contiguous region.

14. A method for hybrid rejection comprising:
acquiring, using a first sensing technique, first sensing data, wherein the first sensing technique comprises:
driving a first subset of the plurality of sensor electrodes with a plurality of transmitter signals, and
receiving, based on the plurality of transmitter signals, a first plurality of resulting signals from a second subset of the plurality of sensor electrodes;

acquiring, using a second capaciti

Assignees

• Synaptics Inc

Inventors

• Ling Yi
• Mani Sanjay
• Fotopoulos Nickolas

Classifications

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F2203/04101

  2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup · CPC title

• G06F2203/04104

  Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger · CPC title

• G06F3/04186 Primary

  Touch location disambiguation · CPC title