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1. WO2009007704 - TWO-DIMENSIONAL TOUCH PANEL

Publication Number WO/2009/007704
Publication Date 15.01.2009
International Application No. PCT/GB2008/002328
International Filing Date 07.07.2008
IPC
G06F 3/044 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
3Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
01Input arrangements or combined input and output arrangements for interaction between user and computer
03Arrangements for converting the position or the displacement of a member into a coded form
041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
044by capacitive means
CPC
G06F 3/04166
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
3Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
01Input arrangements or combined input and output arrangements for interaction between user and computer
03Arrangements for converting the position or the displacement of a member into a coded form
041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
0416Control or interface arrangements specially adapted for digitisers
04166Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
G06F 3/0446
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
3Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
01Input arrangements or combined input and output arrangements for interaction between user and computer
03Arrangements for converting the position or the displacement of a member into a coded form
041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
044by capacitive means
0446using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
G06F 3/0448
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
3Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
01Input arrangements or combined input and output arrangements for interaction between user and computer
03Arrangements for converting the position or the displacement of a member into a coded form
041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
044by capacitive means
0448Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
Applicants
  • ATMEL CORPORATION [US]/[US] (AllExceptUS)
  • SIMMONS, Martin [GB]/[GB] (UsOnly)
  • YILMAZ, Esat [GB]/[GB] (UsOnly)
Inventors
  • SIMMONS, Martin
  • YILMAZ, Esat
Agents
  • COLLINS, John, D.
Priority Data
60/949,37612.07.2007US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) TWO-DIMENSIONAL TOUCH PANEL
(FR) ECRAN TACTILE BIDIMENSIONNEL
Abstract
(EN)
A capacitive touch panel is provided capable of detecting multiple simultaneous touches. The touch panel delivers sets of capacitance signal values to a processor which computes the coordinates of single or multiple touch locations on the touch panel. The processing of each set is performed by (i) identifying the sensing element having the largest capacitance signal value; (ii) defining a region around that sensing element; and (iii) repeating the process iteratively, wherein each subsequent identifying step excludes signals that lie in previously defined regions. A multi-touch sensor is thus provided in which the signal processing is based on successive definition of regions or sub-blocks in the touch: panel. The touch location in each region can be determined more accurately by then applying interpolation between the adjacent signal values. This allows for position resolution at a finer scale than that defined by the touch panel's electrode patterning.
(FR)
La présente invention concerne un écran tactile capacitif capable de détecter des touches multiples simultanées. L'écran tactile délivre des ensembles de valeurs de signal de capacité à un processeur qui calcule les coordonnées d'un ou de plusieurs emplacements de touches sur l'écran tactile. Le traitement de chaque ensemble est réalisé par (i) identification de l'élément de détection ayant la plus grande valeur de signal de capacité; (ii) par détermination d'une région proche de cet élément de détection; et (iii) par réitération du processus, chaque étape d'identification ultérieure excluant les signaux qui se trouvent dans les régions précédemment définies. L'invention concerne ainsi un détecteur tactile multitouche dans lequel le traitement du signal repose sur la détermination successive de régions ou de sous-blocs dans l'écran tactile. L'emplacement tactile dans chaque région peut être déterminé plus précisément par application d'une interpolation entre les valeurs de signal adjacentes. Ceci permet une résolution de position à une échelle plus fine que celle définie par la configuration des électrodes de l'écran tactile.
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