WO2010059216A1 - Procédé et système pour mesurer la position sur un panneau tactile à capacité de surface à l’aide d’un condensateur volant - Google Patents

Procédé et système pour mesurer la position sur un panneau tactile à capacité de surface à l’aide d’un condensateur volant Download PDF

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Publication number
WO2010059216A1
WO2010059216A1 PCT/US2009/006197 US2009006197W WO2010059216A1 WO 2010059216 A1 WO2010059216 A1 WO 2010059216A1 US 2009006197 W US2009006197 W US 2009006197W WO 2010059216 A1 WO2010059216 A1 WO 2010059216A1
Authority
WO
WIPO (PCT)
Prior art keywords
touch panel
capacitor
current
method further
pointing object
Prior art date
Application number
PCT/US2009/006197
Other languages
English (en)
Inventor
Jared G. Bytheway
Keith L. Paulsen
Original Assignee
Cirque Corportion
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 Cirque Corportion filed Critical Cirque Corportion
Priority to CN200980146539.5A priority Critical patent/CN102224481B/zh
Priority to JP2011537422A priority patent/JP5220201B2/ja
Publication of WO2010059216A1 publication Critical patent/WO2010059216A1/fr

Links

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
    • G06F3/044—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
    • 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

Definitions

  • This invention relates generally to touchpad technology. More specifically, the present invention is a new method of determining the position of a pointing object on a surface capacitance touch panel .
  • a well-known touchpad technology uses a surface capacitance touch panel 10 as shown in Figure 1.
  • a touch panel 10 is a solid sheet of a conductive material 16 disposed on an insulating substrate 18 such as glass, with sensors 12 disposed at the corners.
  • the traditional method of measuring the position of a pointing object 14 or the "touch position" on the surface capacitance touch panel 10 is to apply an AC signal on all four corners of the touch panel's conductive layer 16.
  • the conductive layer 16 can be made, for example, of Indium Tin Oxide (ITO) .
  • the surface of the glass substrate 18 is flooded or covered with a substantially even layer of a resistive ITO material which forms a sheet resistance.
  • a dielectric is then applied to cover the ITO conductive material.
  • the next step is to triangulate the touch position using the current flowing through each corner. It is common to apply either a sine wave or a square wave .
  • the capacitance value is very small, typically in the order of 5OpF.
  • the amount of charge or current that has to be measured going into each corner 12 of the panel is therefore very small. Because the current is so small, the system is very susceptible to stray capacitance. Thus, the accuracy of touch panels
  • the present invention is a touch panel having a substantially even coating of a conductive material on a non-conductive substrate and then covering the conductive material with a dielectric material, wherein a novel current measuring circuit reduces the effect of stray capacitance on the accuracy of a current measurement so that the relative position of an object on the touch panel can be determined using simple ratio equations.
  • Figure 1 is a perspective view of a touch panel as found in the prior art.
  • FIG. 2 is a perspective view of a touch panel 10 that is made in accordance with principles of the prior art .
  • FIG. 3 is a perspective view of a touch panel 10 that is made in accordance with the principles of the present invention.
  • Figure 4 is a circuit diagram showing how a sensitive current measuring circuit comprised of a capacitor and a current measuring sensor is applied to the touch panel .
  • Figure 2 shows the surface of a touch panel 10 as found in the prior art.
  • the lines 20 are indicative of the voltage gradient that is produced across the surface of the touch panel when a voltage is applied at two corners of the surface. For example, the voltage is applied at corners 22 and 24 resulting in the constant voltage gradient shown. There is significant distortion of the voltage gradient lines 20 which is common to many touch panels 10.
  • FIG. 3 is a perspective view of a touch panel 10 that is made in accordance with the principles of the present invention.
  • a new and novel approach to determining the position of an object on the touch panel is to charge a large capacitor and then apply this "flying capacitor" to the touch panel 10.
  • this method measures the instantaneous and total current induced in a contact on a surface of the touch panel
  • FIG. 4 is a circuit diagram showing how a sensitive current measuring circuit comprised of a capacitor and a current measuring sensor is applied to the touch panel 10 in a first embodiment of the present invention. Any charge that is taken from the touch panel 10 is measured with the current measuring circuit .
  • the first step is to electrically couple a positive node of the flying capacitor 30 to a first side 40 of the touch panel 10 while the negative node is electrically coupled to an opposite second side 42 of the touch panel along with a sensor or current measuring circuit 44.
  • the current measuring circuit 44 can be an ammeter.
  • the voltage gradient is formed across the surface of the touch panel 10 from the first side 40 to the second side 42, and to the sensor circuit 44.
  • a finger or other pointing object 50 touching the surface of the touch panel 10 at any given point will cause a drain on the current that is being measured by the sensor circuit 44.
  • the drain in current to the sensor circuit 44 is a function of the distance of the finger from the first and second sides 40, 42 of the touch panel 10.
  • the first measurement Xl is thus the current leaving the touch panel 10 at the second side 44.
  • first side 40 is arbitrarily a left side of the touch panel 10 as shown in figure 4.
  • the second side 42 would therefore correspond to the right side of the touch panel 10.
  • the first and second sides 40, 42 are arbitrarily selected and can be switched with no change in the method of the present invention.
  • the second current measurement X2 is taken by switching the positive and negative nodes of the flying capacitor 30 between the first and second sides 40, 42 of the touch panel 10.
  • the current measuring circuit 44 is also moved when the circuit is reversed to take current measurement X2.
  • a position of the pointing object 50 can be determined as a ratio of current measurements Xl and X2.
  • the position of the pointing object 50 is a value that is easily assigned to be between zero and one, and is determined using equation 1:
  • the positive node of the flying capacitor 30 can be coupled to the top edge 26 or the bottom edge 28 first.
  • the decision regarding which edge to connect to the positive node first is arbitrary.
  • the result is current measurements Yl and Y2.
  • a Y position ratio is then obtained using equation 2 :
  • the strength of the present invention as described above is that the flying capacitor 30 is used to create the high current required to produce the constant voltage gradient on the surface of the touch panel 10 and thus enable direct measurement of the current leaving the surface though contacts on the surface.
  • the current induced in the low resistance material is much larger than the current induced in the pointing object on the surface. Having a large current to measure increases the accuracy of the system and reduces the effect that stray capacitances can have on the measurements .
  • the charge on the flying capacitor 30 is rapidly being refreshed in order to maintain the voltage gradient across the touch panel 10.
  • the process of disconnecting the flying capacitor 30 from the touch panel 10, refreshing the charge, and then reconnecting the flying capacitor to the touch panel 10 is well known to those skilled in the art and is not an aspect of the present invention.
  • the advantage of the embodiment of the present invention described above is that a voltage gradient is formed across the touch panel 10 using a relatively crude yet simple current measuring circuit 44. Nevertheless, a measurement of the current going.to the pointing object is very precisely measured because there is no other path for the current to follow other than between the positive and negative nodes of the flying capacitor 30 and the pointing object 50.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L’invention concerne un panneau tactile comportant un revêtement sensiblement uniforme d’un matériau conducteur sur un substrat non conducteur puis recouvrant le matériau conducteur d’un matériau diélectrique, dans lequel un circuit de mesure du courant innovant réduit l’effet de capacité parasite sur la précision d’une mesure de courant de sorte que la position relative en X et en Y d’un objet sur le panneau tactile peut être déterminée au moyen d’équations de rapports simples.
PCT/US2009/006197 2008-11-20 2009-11-20 Procédé et système pour mesurer la position sur un panneau tactile à capacité de surface à l’aide d’un condensateur volant WO2010059216A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200980146539.5A CN102224481B (zh) 2008-11-20 2009-11-20 使用飞跨电容在表面电容触摸屏上测量位置的方法和系统
JP2011537422A JP5220201B2 (ja) 2008-11-20 2009-11-20 フライング・キャパシタを用いて、表面型静電容量方式タッチ・パネルの上の位置を測定する方法およびシステム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11659208P 2008-11-20 2008-11-20
US61/116,592 2008-11-20

Publications (1)

Publication Number Publication Date
WO2010059216A1 true WO2010059216A1 (fr) 2010-05-27

Family

ID=42198413

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/006197 WO2010059216A1 (fr) 2008-11-20 2009-11-20 Procédé et système pour mesurer la position sur un panneau tactile à capacité de surface à l’aide d’un condensateur volant

Country Status (4)

Country Link
US (2) US8194046B2 (fr)
JP (1) JP5220201B2 (fr)
CN (1) CN102224481B (fr)
WO (1) WO2010059216A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102375631A (zh) * 2010-08-19 2012-03-14 扬泰光电股份有限公司 表面电容式触控面板及其控制方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8754869B2 (en) * 2009-03-06 2014-06-17 Cirque Corporation Surface capacitance with area gestures
US20100328241A1 (en) * 2009-06-12 2010-12-30 Keith Paulsen Method and system for measuring position on surface capacitance touch panel using a flying capacitor
US20110199328A1 (en) * 2010-02-18 2011-08-18 Flextronics Ap, Llc Touch screen system with acoustic and capacitive sensing
EP2580714B1 (fr) * 2010-06-11 2020-02-12 Touchcode Technologies, LLC Système doté d'un support d'informations capacitif servant à détecter des informations
JP2014525611A (ja) * 2011-08-09 2014-09-29 サーク・コーポレーション 線形センサまたは単一層センサ上の２本指ジェスチャ
CN102692748B (zh) * 2012-05-03 2014-03-26 北京京东方光电科技有限公司 一种触控光栅、显示装置及实现3d和触控功能的方法
EP3007109B1 (fr) * 2014-10-06 2016-12-07 T-Touch International S.à.r.l. Support d'informations avec une précision de détection améliorée par une accumulation multicouche du support d'informations
WO2018141478A1 (fr) * 2017-01-31 2018-08-09 Prismade Labs Gmbh Procédé de génération d'un signal dépendant du temps sur un capteur surfacique capacitif, procédé d'identification d'un objet de type carte, objet de type carte et son utilisation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4680430A (en) * 1984-02-29 1987-07-14 Fujitsu Limited Coordinate detecting apparatus
US5861875A (en) * 1992-07-13 1999-01-19 Cirque Corporation Methods and apparatus for data input
US6943705B1 (en) * 2002-05-03 2005-09-13 Synaptics, Inc. Method and apparatus for providing an integrated membrane switch and capacitive sensor

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181913A (ja) * 1984-02-29 1985-09-17 Fujitsu Ltd 座標検出装置
ATE203608T1 (de) * 1989-08-16 2001-08-15 George E Gerpheide Verfahren und vorrichtung zur dateneingabe
JPH0769767B2 (ja) * 1991-10-16 1995-07-31 インターナショナル・ビジネス・マシーンズ・コーポレイション フィンガ・タッチまたはスタイラスの位置を検出するためのタッチ・オーバーレイ、および検出システム
JPH07219709A (ja) * 1994-02-01 1995-08-18 Toupure Kk 座標位置検出装置
CN100350369C (zh) * 2003-08-13 2007-11-21 胜华科技股份有限公司 触控面板
TWI252415B (en) * 2003-10-01 2006-04-01 High Tech Comp Corp Thin-film positioning device
TW200611287A (en) * 2004-09-24 2006-04-01 Holtek Semiconductor Inc Capacitance induction device
CN100410862C (zh) * 2005-10-28 2008-08-13 义隆电子股份有限公司 电阻式触控屏幕测量系统
US7244901B1 (en) * 2006-04-11 2007-07-17 Danotech Co., Ltd. Capacitive touch panel
DE102007016408A1 (de) * 2007-03-26 2008-10-02 Ident Technology Ag Mobiles Kommunikationsgerät und Eingabeeinrichtung hierfür
TW200844827A (en) * 2007-05-11 2008-11-16 Sense Pad Tech Co Ltd Transparent touch panel device
US8400408B2 (en) * 2007-06-13 2013-03-19 Apple Inc. Touch screens with transparent conductive material resistors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4680430A (en) * 1984-02-29 1987-07-14 Fujitsu Limited Coordinate detecting apparatus
US5861875A (en) * 1992-07-13 1999-01-19 Cirque Corporation Methods and apparatus for data input
US6943705B1 (en) * 2002-05-03 2005-09-13 Synaptics, Inc. Method and apparatus for providing an integrated membrane switch and capacitive sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102375631A (zh) * 2010-08-19 2012-03-14 扬泰光电股份有限公司 表面电容式触控面板及其控制方法
CN102375631B (zh) * 2010-08-19 2014-06-25 扬升照明股份有限公司 表面电容式触控面板及其控制方法

Also Published As

Publication number Publication date
JP5220201B2 (ja) 2013-06-26
US8194046B2 (en) 2012-06-05
US20120235954A1 (en) 2012-09-20
US20110063242A1 (en) 2011-03-17
CN102224481B (zh) 2014-07-02
US8432375B2 (en) 2013-04-30
CN102224481A (zh) 2011-10-19
JP2012509539A (ja) 2012-04-19

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