# US 2016/0259484 A1 · Touch-sensitive device

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- Number: US 2016/0259484 A1
- Document ID: US20160259484A1
- Status: Published application
- Kind: A1
- Application number: 15/153,626
- Filed: 2016-05-12
- Published: 2016-09-08
- Earliest claimed: 2008-01-11
- Assignees: O-Net Wavetouch Limited
- Applicants: O-Net Wavetouch Limited
- Inventors: Michael Linde Jakobsen; Vagn Steen Gruner Hanson; Henrik Chresten Pedersen
- Web page: https://patentgrep.com/patent/US20160259484A1

## CPC

- G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen}
- 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

The present invention relates to an optical touch-sensitive device and a method of determining a position and determining a position change of an object contacting an optical touch sensitive device. In particular, the present invention relates to an optical touch pad and a method of determining a position and determining a position change of an object contacting an optical touch pad. A touch-sensitive device, according to the present invention may comprise a light source, a touch-sensitive waveguide, a detector array, and a first light redirecting member, wherein at least a part of the light propagating towards a specific point of the detector array is prevented from being incident upon the specific point of the detector array when an object contacts a touch-sensitive surface of the touch-sensitive waveguide at a corresponding specific contact point.

## Claims

### Claim 1

A touch-sensitive device, comprising:
a light source for emitting light,
a touch-sensitive waveguide configured for guiding light from the light source towards a touch-sensitive surface of the touch-sensitive waveguide in such a way that an object disturbs at least a part of the guided light at a contact point where the object contacts the touch-sensitive surface,
a detector array configured for detecting intensity distribution of light having propagated from the light source through the touch-sensitive waveguide for position encoding the contact point between the object and the touch-sensitive surface, and
a first light redirecting member configured for redirecting light having propagated from the light source through the touch-sensitive waveguide and to the first light redirecting member towards the detector array, such that the redirection of light involves changing the direction of propagation in a plane parallel to the touch-sensitive surface, wherein
at least a part of the light propagating towards a specific point of the detector array is prevented from being incident upon the specific point of the detector array when the object contacts the touch-sensitive surface at a corresponding specific contact point.