FAST MULTI-TOUCH STYLUS AND SENSOR

• US 20180299994A1
• Filed: 06/14/2018
• Published: 10/18/2018
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Tactual Labs Co.
• Original Assignee: Tactual Labs Co.
• Inventors: Leigh, Darren
• Granted Patent: US 10,489,002 B2
• Time in Patent Office: Days
• CPC Class Codes: 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
• CPC Class Codes: 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
• CPC Class Codes: 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
• CPC Class Codes: G06F 3/03542 Light pens for emitting or receiving light
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: 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
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: 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
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

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

1. A method for detecting a position of a touch with respect to a touch sensitive device, the touch sensitive device comprising a plurality of first conductors and a plurality of second conductors, the method comprising:

simultaneously transmitting each of a plurality of orthogonal first signals on a respective one of at least some of the plurality of first conductors;

detecting an amount of each of the plurality of orthogonal first signals present on each of the plurality of second conductors;

simultaneously transmitting each of a plurality of orthogonal second signals on a respective one of at least some of the second conductors, each of the plurality of orthogonal second signals being orthogonal to each other of the plurality of orthogonal second signals and each of the plurality of orthogonal first signals; and

detecting an amount of each of the plurality of orthogonal second signals present on each of the plurality of first conductors using at least the detected amount of each of the plurality of orthogonal second signals present on each of the plurality of first conductors and the detected amount of each of the plurality of orthogonal first signals present on each of the plurality of second conductors to detect a position of touch with respect to the touch sensitive device.

2. The method of claim 1, wherein each of the plurality of orthogonal first signals are frequency orthogonal.

3. The method of claim 1, wherein each of the plurality of orthogonal second signals are frequency orthogonal.