WO2010062808A3 - System and method for determining touch positions based on passively-induced position-dependent electrical charges - Google Patents

System and method for determining touch positions based on passively-induced position-dependent electrical charges Download PDF

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Publication number
WO2010062808A3
WO2010062808A3 PCT/US2009/064681 US2009064681W WO2010062808A3 WO 2010062808 A3 WO2010062808 A3 WO 2010062808A3 US 2009064681 W US2009064681 W US 2009064681W WO 2010062808 A3 WO2010062808 A3 WO 2010062808A3
Authority
WO
WIPO (PCT)
Prior art keywords
sensing surface
passively
electrical charges
measurements
dependent electrical
Prior art date
Application number
PCT/US2009/064681
Other languages
French (fr)
Other versions
WO2010062808A2 (en
Inventor
Craig A. Cordeiro
Bernard O. Geaghan
Original Assignee
3M Innovative Properties Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Company filed Critical 3M Innovative Properties Company
Priority to CN2009801474623A priority Critical patent/CN102227702A/en
Priority to EP09829709.6A priority patent/EP2368171A4/en
Publication of WO2010062808A2 publication Critical patent/WO2010062808A2/en
Publication of WO2010062808A3 publication Critical patent/WO2010062808A3/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0444—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners

Abstract

Systems and methods determine the position of a touch on a surface of a device, such as a touch-sensitive device, by using passively-induced position-dependent electrical charges. In such a method, the position of a touching implement is determined on the sensing surface of a device. The method includes charging the sensing surface during a first time period by connecting all four corners of the sensing surface to a reference voltage, and over a second time period discharging two adjacent corners of the sensing surface into an integrator capacitor while connecting the two opposite corners to ground. The first and second time periods together form a charge/discharge cycle that is repeated a plurality of times, after which an output of the integrator capacitor is measured. This sequence is performed for each of the four pairs of adjacent corners of the sensing surface, resulting in four integrator capacitor output measurements, each of the four measurements being associated with a different sensing surface edge. The position of the touching implement on the sensing surface is then calculated using the four charge measurements.
PCT/US2009/064681 2008-11-26 2009-11-17 System and method for determining touch positions based on passively-induced position-dependent electrical charges WO2010062808A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2009801474623A CN102227702A (en) 2008-11-26 2009-11-17 System and method for determining touch positions based on passively-induced position-dependent electrical charges
EP09829709.6A EP2368171A4 (en) 2008-11-26 2009-11-17 System and method for determining touch positions based on passively-induced position-dependent electrical charges

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/324,243 US8183875B2 (en) 2008-11-26 2008-11-26 System and method for determining touch positions based on passively-induced position-dependent electrical charges
US12/324,243 2008-11-26

Publications (2)

Publication Number Publication Date
WO2010062808A2 WO2010062808A2 (en) 2010-06-03
WO2010062808A3 true WO2010062808A3 (en) 2010-08-26

Family

ID=42195634

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/064681 WO2010062808A2 (en) 2008-11-26 2009-11-17 System and method for determining touch positions based on passively-induced position-dependent electrical charges

Country Status (6)

Country Link
US (1) US8183875B2 (en)
EP (1) EP2368171A4 (en)
KR (1) KR20110086864A (en)
CN (1) CN102227702A (en)
TW (1) TW201027414A (en)
WO (1) WO2010062808A2 (en)

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Also Published As

Publication number Publication date
EP2368171A2 (en) 2011-09-28
KR20110086864A (en) 2011-08-01
TW201027414A (en) 2010-07-16
CN102227702A (en) 2011-10-26
US8183875B2 (en) 2012-05-22
EP2368171A4 (en) 2013-04-10
WO2010062808A2 (en) 2010-06-03
US20100127717A1 (en) 2010-05-27

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