# US 10,372,281 B2 · Fast multi-touch stylus and sensor

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- Number: US 10,372,281 B2
- Document ID: US10372281B2
- Status: Granted
- Kind: B2
- Application number: 15/807,221
- Filed: 2017-11-08
- Published: 2018-03-15
- Granted: 2019-08-06
- Earliest claimed: 2013-03-15
- Assignees: Tactual Labs Co.
- Applicants: Tactual Labs Co.
- Inventors: Darren Leigh
- Web page: https://patentgrep.com/patent/US10372281B2

## CPC

- G06F 3/03542: {Light pens for emitting or receiving light}
- G06F 3/03545: {Pens or stylus}
- G06F 3/04166: {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)}
- G06F 3/04182: {Filtering of noise external to the device and not generated by digitiser components}
- G06F 3/04186: {Touch location disambiguation}
- G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen}
- G06F 3/0441: {using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G06F 2203/04104: 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
- G06F 2203/04106: Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
- G06F 2203/04109: FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A stylus and touch sensitive device are disclosed. The stylus includes a stylus transmitter for transmitting a stylus signal. The touch sensitive device includes row conductors, each of which is associated with a row transmitter and a row receiver. The row transmitter is adapted to simultaneously transmit row signals, each on its associated row conductor, each of the row signals being orthogonal to each other of the plurality of row signals transmitted on each other of the row conductors. The row receiver is adapted to detect the stylus signal. Column conductors are provided, each associated with a column receiver that is adapted to detect the presence of each of the row signals transmitted by the row transmitter and the stylus signal.

## Claims

### Claim 1

A method of synchronizing stylus modulation with a signal received from a sensor, the sensor having a plurality of row conductors, each of the plurality of row conductors having a unique orthogonal row signal thereon and each unique orthogonal row signal being orthogonal to each other unique orthogonal row signal, a stylus comprising a stylus receiver adapted to receive signals present on row conductors, the method comprising:
a. receiving on a stylus receiver at least one of the unique orthogonal row signals; and
b. synchronizing a stylus modulation to at least one of the received unique orthogonal row signals;
c. generating a modulated stylus signal based on the stylus modulation; and
wherein the stylus further comprises a stylus transmitter adapted to transmit a stylus signal, the stylus signal being orthogonal to each of the unique orthogonal row signals, the method further comprising a step of transmitting the modulated stylus signal with the stylus transmitter.

### Claim 2

A modulation synchronizing stylus, comprising:
a. a body having a tip;
b. a receiver configured to receive at least one signal present on at least one conductor in a sensor having a plurality of conductors;
c. a signal generator operatively connected to the receiver, the signal generator being adapted to synchronize a modulation to at least one of the at least one signal received by the receiver, and to generate a stylus signal based on the modulation; and
d. a transmitter located near the tip, the transmitter adapted to transmit the stylus signal, the stylus signal being orthogonal to each unique orthogonal signal present on each conductor in the sensor, the transmitter further adapted to transmit the stylus signal based on the modulation with the transmitter.