WO2010036545A3 - Mutual capacitance measuring circuits and methods - Google Patents

Mutual capacitance measuring circuits and methods Download PDF

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Publication number
WO2010036545A3
WO2010036545A3 PCT/US2009/057114 US2009057114W WO2010036545A3 WO 2010036545 A3 WO2010036545 A3 WO 2010036545A3 US 2009057114 W US2009057114 W US 2009057114W WO 2010036545 A3 WO2010036545 A3 WO 2010036545A3
Authority
WO
WIPO (PCT)
Prior art keywords
methods
mutual capacitance
capacitance measuring
measuring circuits
receive electrode
Prior art date
Application number
PCT/US2009/057114
Other languages
French (fr)
Other versions
WO2010036545A2 (en
Inventor
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 JP2011529115A priority Critical patent/JP2012503774A/en
Priority to EP09816711A priority patent/EP2344895A4/en
Priority to CN200980141593.0A priority patent/CN102187236B/en
Publication of WO2010036545A2 publication Critical patent/WO2010036545A2/en
Publication of WO2010036545A3 publication Critical patent/WO2010036545A3/en

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/02Measuring effective values, i.e. root-mean-square values
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • G06F3/04166Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving

Abstract

An apparatus for measuring a parameter related to the capacitance between a drive electrode and a receive electrode of a touch sensitive device. The apparatus includes an accumulator capacitor coupled at one end to a voltage measurement circuit and at the other end to the receive electrode, and control circuitry configured and arranged, during each cycle of a measurement sequence, to connect a reference voltage to a first node that electrically connects the accumulator capacitor to the voltage measurement circuit. The apparatus further includes a resistive circuit configured and arranged to draw current from a second node electrically connected to the accumulator capacitor and to the receive electrode during the measurement sequence.
PCT/US2009/057114 2008-09-24 2009-09-16 Mutual capacitance measuring circuits and methods WO2010036545A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2011529115A JP2012503774A (en) 2008-09-24 2009-09-16 Circuit and method for measuring mutual capacitance
EP09816711A EP2344895A4 (en) 2008-09-24 2009-09-16 Mutual capacitance measuring circuits and methods
CN200980141593.0A CN102187236B (en) 2008-09-24 2009-09-16 Mutual capacitance measuring circuits and methods

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US9965008P 2008-09-24 2008-09-24
US61/099,650 2008-09-24
US15771509P 2009-03-05 2009-03-05
US61/157,715 2009-03-05
US18705009P 2009-06-15 2009-06-15
US61/187,050 2009-06-15

Publications (2)

Publication Number Publication Date
WO2010036545A2 WO2010036545A2 (en) 2010-04-01
WO2010036545A3 true WO2010036545A3 (en) 2010-06-24

Family

ID=42037146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/057114 WO2010036545A2 (en) 2008-09-24 2009-09-16 Mutual capacitance measuring circuits and methods

Country Status (7)

Country Link
US (1) US8363031B2 (en)
EP (1) EP2344895A4 (en)
JP (1) JP2012503774A (en)
KR (1) KR20110067039A (en)
CN (1) CN102187236B (en)
TW (1) TW201018928A (en)
WO (1) WO2010036545A2 (en)

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US8363031B2 (en) 2013-01-29
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CN102187236B (en) 2015-04-22
WO2010036545A2 (en) 2010-04-01
KR20110067039A (en) 2011-06-20
JP2012503774A (en) 2012-02-09
EP2344895A2 (en) 2011-07-20
EP2344895A4 (en) 2013-02-27
TW201018928A (en) 2010-05-16

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