WO2006135483A3 - Sensor baseline compensation in a force-based touch device - Google Patents

Sensor baseline compensation in a force-based touch device Download PDF

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Publication number
WO2006135483A3
WO2006135483A3 PCT/US2006/013917 US2006013917W WO2006135483A3 WO 2006135483 A3 WO2006135483 A3 WO 2006135483A3 US 2006013917 W US2006013917 W US 2006013917W WO 2006135483 A3 WO2006135483 A3 WO 2006135483A3
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WO
WIPO (PCT)
Prior art keywords
force
value
sensor signal
force sensor
decaying
Prior art date
Application number
PCT/US2006/013917
Other languages
French (fr)
Other versions
WO2006135483A2 (en
Inventor
David A Soss
Original Assignee
Qsi Corp
David A Soss
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 Qsi Corp, David A Soss filed Critical Qsi Corp
Publication of WO2006135483A2 publication Critical patent/WO2006135483A2/en
Publication of WO2006135483A3 publication Critical patent/WO2006135483A3/en

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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
    • G06F3/0416Control 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
    • 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
    • G06F3/0414Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
    • G06F3/04144Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position using an array of force sensing means

Abstract

Disclosed is method and device for compensating a force sensor signal for baseline error in a force-based touch screen. In one embodiment, baseline compensation includes determining (102, 104) a decaying maximum value (406) and a decaying minimum value (408) of the force sensor signal 306), and subtracting (108) these values to obtain a range value (412). When the range value is less than a predetermined activity threshold (415), updating (110) of the baseline is disabled. The decaying maximum value and decaying minimum value are reset to the current value of the force sensor signal when exceeded by the current value of the force sensor signal.
PCT/US2006/013917 2005-06-10 2006-04-12 Sensor baseline compensation in a force-based touch device WO2006135483A2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US68973105P 2005-06-10 2005-06-10
US60/689,731 2005-06-10
US70886705P 2005-08-16 2005-08-16
US60/708,867 2005-08-16
US11/402,692 2006-04-11
US11/402,692 US7337085B2 (en) 2005-06-10 2006-04-11 Sensor baseline compensation in a force-based touch device

Publications (2)

Publication Number Publication Date
WO2006135483A2 WO2006135483A2 (en) 2006-12-21
WO2006135483A3 true WO2006135483A3 (en) 2008-08-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/013917 WO2006135483A2 (en) 2005-06-10 2006-04-12 Sensor baseline compensation in a force-based touch device

Country Status (2)

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US (2) US7337085B2 (en)
WO (1) WO2006135483A2 (en)

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