IMPROVED MULTI-TOUCH DETECTION IN A TOUCH SYSTEM

Title:

IMPROVED MULTI-TOUCH DETECTION IN A TOUCH SYSTEM

Document Type and Number:

WIPO Patent Application WO/2013/055282

Kind Code:

A3

Abstract:

Multi-touch sensitivity is enabled using a touch system that comprises a panel configured to conduct signals, e.g. by FTIR, from a plurality of incoupling points to a plurality of outcoupling points, thereby defining detection lines across the panel between pairs of incoupling and outcoupling points. A signal processor operates in a repeating sequence of iterations to obtain (50) a current signal value for each detection line, and generate (53, 53') a first interaction pattern and a second interaction pattern as a function of the current signal values, such that the first and second interaction patterns are reconstructed two-dimensional distributions of local interaction with the conducted signals across the surface portion, and represent changes in interaction on different time scales. Thereby, the movement of an object will affect how it is represented in each of the first and second interaction patterns. Touch detection may be improved by proper selection of the time scales and combined analysis (56) of the first and second interaction patterns.

Inventors:

CHRISTIANSSON TOMAS (SE)
WALLANDER MATS PETTER (SE)
JUHLIN PETER (SE)
JOHANSSON ANDREAS (SE)
WALL HENRIK (SE)
OHLSSON NICKLAS (SE)

Application Number:

PCT/SE2012/051073

Publication Date:

June 06, 2013

Filing Date:

October 08, 2012

Export Citation:

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Assignee:

FLATFROG LAB AB (SE)

International Classes:

G06F3/042

Domestic Patent References:

WO2002007072A2	2002-01-24
WO2011049512A1	2011-04-28
WO2011028169A1	2011-03-10

Foreign References:

US20090153519A1	2009-06-18
US20110084939A1	2011-04-14

Other References: