IP Library › Granted Patent US 12,229,353
Granted Patent B2
US 12,229,353 · App. 18/525,165 · Granted Feb 18, 2025

Differential sensing in an active stylus

Inventors: Kishore Sundara-Rajan (San Jose, CA); Yassar Ali (Sunnyvale, CA); Igor Polishchuk (Fremont, CA); James D. Lyle (Santa Clara, CA)
Assignee: Wacom Co., Ltd.
G06F3/03545G06F3/0383
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Quick Facts
Patent No.
US 12,229,353
App. No.
18/525,165
Granted
Feb 18, 2025
Kind
B2
Abstract

In one embodiment, a stylus receives a first signal from a first electrode of the stylus, the stylus being operable to communicate wirelessly with a device through a touch sensor of the device; receives a second signal from a second electrode of the stylus, the second signal being a reference signal and the second electrode being a reference electrode; and compares the first signal with the second signal.

Claims (13)

1. A non-transitory computer-readable medium comprising logic, the logic configured to, when executed by one or more processors, cause the one or more processors to perform operations comprising:

receiving, with a first electrode of a first device, a first signal comprising a signal component, the first device being operable to communicate wirelessly with a second device via the first electrode and through a sensor of the second device;

receiving a second signal with a second electrode of the first device, the second signal comprising a signal component, the first signal and the second signal each containing noise having similar characteristics, and wherein the signal component of the first signal is a first version of a signal of the second device and the signal component of the second signal is a second version of the signal of the second device;

removing noise from the first signal by subtracting the second signal from the first signal, including generating an output that is the difference between the first signal and the second signal; and

determining the signal component of the first signal based on the output and the signal component of the second signal.

2. The non-transitory computer-readable medium of claim 1 , wherein the first electrode of the first device spans between a first distal end and a first proximal end along a longitudinal axis of the first device, the second electrode of the first device spans between a second distal end and a second proximal end along the longitudinal axis of the first device, and the first proximal end of the first electrode is located distal to the second distal end of the second electrode along the longitudinal axis of the first device.

3. The non-transitory computer-readable medium of claim 1 , wherein removing noise from the first signal comprises using an operational amplifier.

4. The non-transitory computer-readable medium of claim 1 , wherein removing noise from the first signal comprises using a digital comparator.

5. The non-transitory computer-readable medium of claim 1 , wherein the first electrode and the second electrode of the first device interpose a third electrode in-between along a longitudinal axis of the first device.

6. The non-transitory computer-readable medium of claim 5 , wherein the third electrode is coupled to ground.

7. The non-transitory computer-readable medium of claim 1 , wherein the operations comprise:

transmitting, with at least one of the first electrode and the second electrode of the first device, a third signal to the second device, in response to the signal of the second device.

8. The non-transitory computer-readable medium of claim 1 , wherein the first electrode and the second electrode of the first device are concentrically arranged about a longitudinal axis of the first device.

Continuity (5)
Continuation 17698767 · Mar 18, 2022
Continuation 16939862 · Jul 27, 2020
Continuation 13434596 · Mar 29, 2012
Provisional Application 61553114 · Oct 28, 2011
Related Publication 20240094835A1 · Mar 21, 2024
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