WO2009085656A3 - Time-sloped capacitance measuring circuits and methods - Google Patents

Time-sloped capacitance measuring circuits and methods Download PDF

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Publication number
WO2009085656A3
WO2009085656A3 PCT/US2008/086580 US2008086580W WO2009085656A3 WO 2009085656 A3 WO2009085656 A3 WO 2009085656A3 US 2008086580 W US2008086580 W US 2008086580W WO 2009085656 A3 WO2009085656 A3 WO 2009085656A3
Authority
WO
WIPO (PCT)
Prior art keywords
time
sloped
ramping
ramp
voltage signal
Prior art date
Application number
PCT/US2008/086580
Other languages
French (fr)
Other versions
WO2009085656A2 (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 CN200880123086XA priority Critical patent/CN101910849A/en
Priority to EP08868771A priority patent/EP2232277A2/en
Publication of WO2009085656A2 publication Critical patent/WO2009085656A2/en
Publication of WO2009085656A3 publication Critical patent/WO2009085656A3/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • 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
    • 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
    • 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
    • G06F3/0418Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04182Filtering of noise external to the device and not generated by digitiser components
    • 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
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96Touch switches
    • H03K17/962Capacitive touch switches
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
    • 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
    • G06F3/0444Digitisers, 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
    • 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

Abstract

Time-sloped capacitance measuring circuits use the time to ramp voltage signals between reference levels to determine an unknown capacitance, where the ramping time is determined by the cumulative whole number of clock cycles counted during voltage signal ramping over multiple ramp cycles. Measurement resolution can be improved by adjusting a starting voltage level for subsequent voltage signal ramps by an amount that compensates for incremental voltage ramping during a terminal clock cycle of a previous voltage signal ramp.
PCT/US2008/086580 2007-12-28 2008-12-12 Time-sloped capacitance measuring circuits and methods WO2009085656A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200880123086XA CN101910849A (en) 2007-12-28 2008-12-12 Time-sloped capacitance measuring circuits and methods
EP08868771A EP2232277A2 (en) 2007-12-28 2008-12-12 Time-sloped capacitance measuring circuits and methods

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US1745107P 2007-12-28 2007-12-28
US61/017,451 2007-12-28
US12/027,852 2008-02-07
US12/027,852 US7830158B2 (en) 2007-12-28 2008-02-07 Time-sloped capacitance measuring circuits and methods

Publications (2)

Publication Number Publication Date
WO2009085656A2 WO2009085656A2 (en) 2009-07-09
WO2009085656A3 true WO2009085656A3 (en) 2009-09-17

Family

ID=40797399

Family Applications (3)

Application Number Title Priority Date Filing Date
PCT/US2008/085830 WO2009085571A2 (en) 2007-12-28 2008-12-08 Pulsed capacitance measuring circuits and methods
PCT/US2008/086580 WO2009085656A2 (en) 2007-12-28 2008-12-12 Time-sloped capacitance measuring circuits and methods
PCT/US2008/086924 WO2009085727A2 (en) 2007-12-28 2008-12-16 Multiple capacitance measuring circuits and methods

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2008/085830 WO2009085571A2 (en) 2007-12-28 2008-12-08 Pulsed capacitance measuring circuits and methods

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US2008/086924 WO2009085727A2 (en) 2007-12-28 2008-12-16 Multiple capacitance measuring circuits and methods

Country Status (5)

Country Link
US (3) US7830157B2 (en)
EP (3) EP2232275A2 (en)
KR (3) KR20100107477A (en)
CN (3) CN101925827B (en)
WO (3) WO2009085571A2 (en)

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US20090167326A1 (en) 2009-07-02
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US7830158B2 (en) 2010-11-09
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US20090167325A1 (en) 2009-07-02
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US7830157B2 (en) 2010-11-09
WO2009085727A3 (en) 2009-09-03

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