WO2012073261A1 - Procédé amélioré pour déterminer des entrées tactiles multiples sur un écran tactile résistif - Google Patents

Procédé amélioré pour déterminer des entrées tactiles multiples sur un écran tactile résistif Download PDF

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Publication number
WO2012073261A1
WO2012073261A1 PCT/IT2010/000476 IT2010000476W WO2012073261A1 WO 2012073261 A1 WO2012073261 A1 WO 2012073261A1 IT 2010000476 W IT2010000476 W IT 2010000476W WO 2012073261 A1 WO2012073261 A1 WO 2012073261A1
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WO
WIPO (PCT)
Prior art keywords
layer
read voltage
coordinate
axis
value
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Application number
PCT/IT2010/000476
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English (en)
Inventor
Andrea Celani
Pastore Nicolo'
Original Assignee
Haptyc Technology S.R.L.
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Application filed by Haptyc Technology S.R.L. filed Critical Haptyc Technology S.R.L.
Priority to PCT/IT2010/000476 priority Critical patent/WO2012073261A1/fr
Publication of WO2012073261A1 publication Critical patent/WO2012073261A1/fr

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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
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • 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
    • 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
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/048—Indexing scheme relating to G06F3/048
    • G06F2203/04808—Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen

Definitions

  • the present invention relates to an improved method for determining multiple touch inputs on a resistive touch screen.
  • Patent application PCT/IT2009/000238 discloses a method for determining multiple touch inputs on a resistive touch screen. Particularly, the method teaches to read the value of a current that flows in one of the two layers of the resistive screen when that layer is simultaneously touched at two distinct points PI and P2 and is powered with a voltage equal to the power-line voltage. For example, the coordinates X of the touch points P I and P2 are used to process the current value and obtain a modulus value ⁇ , representative of the difference along the x axis of the first layer between the coordinates of the first touch point PI and the second touch point P2.
  • the x coordinates of the two points PI e P2 may be calculated by addition or subtraction of the modulus value ⁇ to or from the coordinates POxc of the midpoint PO.
  • the modulus value Ay representative of the difference along an axis perpendicular to the first axis within the first layer, is obtained likewise; once the modulus value Ay has been obtained, the y coordinates for the two points PI and P2 may be calculated by addition or subtraction of the modulus value Ay to or from the coordinates POyc of the midpoint PO.
  • the coordinates of the midpoint PO are estimated by detecting the read voltage from a reading terminal V I or V2 of one of the two links defined by the resistors Rl 1 , R12 and R3 and the resistors R7, R8 and R3 respectively, when the screen is simultaneously touched at the two points PI and P2.
  • the present invention is based on the problem of providing a method that has such functional features as to fulfill the above need, while obviating the above prior art drawbacks.
  • a method for determining the coordinates of each touch point without changing the construction of a common resistive touch screen, such as of the 4- wire, 5-wire or 8-wire screen.
  • the present invention may particularly find application in a variety of electronic apparatus such as ATMs (Automated Teller Machines), kiosks, POS (Points of Service) apparatus, but especially in electronic devices such as PDAs (Personal Digital Assistants), mobile phones, notebooks, laptops, MP3 readers, etc.
  • ATMs Automated Teller Machines
  • POS Points of Service
  • PDAs Personal Digital Assistants
  • mobile phones notebooks, laptops, MP3 readers, etc.
  • FIG. 1 shows a diagrammatic view of the panel when it is touched at two points with the coordinates of the points being determined along an axis, according to the present invention
  • FIG. 2 shows a different diagrammatic view of the panel of Figure 1 , in which the centering problem is identified;
  • FIG. 3 shows the same diagrammatic view as the panel of Figure 2, with the coordinates of the points being determined along an axis, according to the present invention
  • FIG. 4 shows a diagrammatic view as the panel of Figure 2, with the coordinates of the points being determined along another axis, according to the present invention
  • FIG. 5 and 6 show a different diagrammatic view of the panel of Figure 1 , in which the ambiguous orientation problem is identified; Detailed description
  • the layer that is powered with the voltage Vcc is, for instance, the layer representative of the y coordinates, whereas the layer that is held floating is, for instance, the one representative of the x coordinates.
  • the current 12 that flows in the powered layer increases as compared to the one that would be obtained if the screen were touched at a single touch point. Such increase is caused by the fact that by touching the first screen layer at two points, a parallel path is introduced in the lower panel, (here representing the x coordinate).
  • the current 12 also flows through the links defined by the resistors Rl 1 , R12, R3 and the resistors R7, R8 and R3 respectively.
  • the coordinate of the midpoint P0 is estimated by evaluating one of the two possible read voltages VI and V2 provided by common resistive touch screen control circuitry.
  • the present inventors found that the touch point PI , i.e. the one placed, for instance, at the top right, will "influence" more the reading terminal V 1 , whereas the touch point P2, placed for instance at the bottom left, will "influence” more the reading terminal V2.
  • This different influence on the reading terminals VI , V2 is caused by the fact that the average voltage evaluated in one of the two reading terminals VI or V2 is obtained by weighting the two touch voltages by their impedance to the reading terminal.
  • the step of obtaining the coordinates P0xc,P0yc of the midpoint P0 is carried out by first detecting a first read voltage VI (reading terminal VI) and a second read voltage V2 (reading terminal V2) and then by processing a read voltage Vxc, Vyc that equals an average value between the first read voltage VI and the second read voltage V2 (by appropriately changing the power nodes and the read nodes) to obtain said coordinates POxc, POyc of the midpoint P0.
  • the modulus value ⁇ (and likewise the modulus value Ay) is calculated by powering the first layer 2A (e.g. the flexible outer layer) with a voltage value Vcc, while such first layer 2A is touched in the first point PI and the second point P2 respectively; by detecting a first current value I2,x for the current flowing in the first layer 2A, i.e. the layer powered with the voltage value Vcc; by processing the first current value I2,x to determine a first modulus value ⁇ representative of the coordinate difference along the axis 2C (e.g. the x axis) of the first layer 2A between the coordinates of the first touch point PI and those of the second touch point P2.
  • the method may include, also with reference to Figure 3, averaging of the read voltages VI and V2 to obtain an estimate of the average voltage Vyc, representative of the coordinate POyc of the midpoint P0, which is more accurate than the estimate that can be obtained by traditional methods.
  • the average voltage Vyc may be calculated using the following formula:
  • Vyc — — in which a and ⁇ are two parameters that account for the impedance with which the two touch points PI and P2 control the related voltages VI and V2.
  • These two parameters a and ⁇ may be obtained iteratively, may be calculated by a complex model of the resistive panel, or may be also saved in a previously prepared look-up table.
  • a more accurate estimate of the coordinate POxc of the midpoint PO consists in averaging the read voltages V I and V2 using weights ⁇ , ⁇ , i.e. according to the following formula:
  • ⁇ are ⁇ are two weights or parameters that account for the impedance with which the two touch points PI and P2 control the related voltages VI and V2.
  • the two parameters ⁇ and ⁇ may be obtained iteratively, may be calculated by a complex model of the resistive panel, or may be also saved in a previously prepared look-up table.
  • the modulus value Ax and the modulus value Ay have been obtained (as described in PCT/IT2009/000238), and knowing the coordinates POxc, POyc of the midpoint PO from the average read voltage Vxc, Vyc, the x and y coordinates of the two points PI e P2 may be calculated by addition or subtraction of the modulus value Ax, Ay to or from the coordinates xc, yc of the midpoint PO.
  • the spatial coordinates POxc and POyx may be obtained by the method in a conversion step, for converting such voltage values Vxc, Vyc, in proportion to the size of the resistive panel, into the coordinates POxc and POyc.
  • Such conversion step requires knowledge of the size of the resistive panel (e.g. its pixel size according to the graphic display with which the touch screen panel is coupled, or the size in meters, etc.).
  • the conversion step of the method is based on pixel conversion. This ensures direct use of the coordinates by the graphic processing system that actively controls the graphic display mounted with the resistive panel.
  • Characteristic parameters of the resistive panel are known by the skilled person to be, for instance, the y axis dimension Height p j xe i,y or the x axis dimension Height p j xe of the pixel graphic display.
  • the coordinates POxc and POyc may be calculated, e.g. using the following formulas:
  • Vcc is the voltage supplied to the panel or more generally the potential difference between one terminal of the panel and the other terminal of the panel with which the voltage reference is connected (ground reference of the circuit).
  • the electronic circuitry of the resistive touch screen can identify two pairs of touch points ⁇ and ⁇ , using the acquired information (i.e. the coordinates P0xc,P0yc of the midpoint P0, Ay and ⁇ , see Figure 5).
  • both pairs of touch points ⁇ and ⁇ have the same coordinates P0xc,P0yc, the same value Ay and the same value ⁇ as the midpoint
  • Each pair ⁇ or ⁇ unless they have identical x or y coordinates, is oriented along a diagonal of a hypothetical Cartesian reference plane. Each pair is also in specular orientation with respect to the other.
  • the electronic circuitry of the resistive touch screen cannot determine, with the acquired information, whether the two touch points PI and P2 are oriented in the direction of extension of the pair of touch points ⁇ or in the direction of extension of the pair of touch points ⁇ , as both pairs ⁇ and ⁇ fulfill the reading conditions.
  • the circuitry has to solve the problem of ambiguous orientation of the two touch points PI and P2, which may cause wrong interpretation of the x and/or y coordinates of the two touch points.
  • the pair of touch points ⁇ may extend along a top right to bottom left diagonal (i.e. the first and third quadrants of a Cartesian reference system centered in the midpoint P0xc,P0yc ) whereas the pair of touch points ⁇ may extend along a top left to bottom right diagonal (i.e. the second and fourth quadrants of a Cartesian reference system centered in the midpoint P0xc,P0yc) or vice versa.
  • the method may comprise the step of monitoring the difference between the potential at the reading terminal V I and the potential at the reading terminal V2, to determine the orientation of the axis that joins the two touch points PI and P2 with respect to the supply axis.
  • the present inventors found from experimental tests that the reading terminals V I and V2 are controlled with a different impedance, proportional to the distance from each of the two touch points P I and P2.
  • the point PI since the point PI is closer to the reading terminal V I , it has a lower impedance than the touch point P2.
  • the touch point PI controls the terminal VI with a lower impedance than the touch point P2, that controls it with a higher impedance.
  • the touch point PI will force a voltage close to that of the point PI , which is higher (according to the voltage supply of the panel) than that of the touch point P2.
  • the method may advantageously comprise a step of checking whether the voltage of the reading terminal VI is higher than the voltage of the reading terminal V2 of the first layer 2A (see Figure 3), and if it is, determining the coordinates Ply of said first touch point PI along the axis 2D (i.e. the y axis) of the layer 2B by summing half the value Ay to the coordinate POyc of the midpoint P0 for such axis 2D of the layer 2B of the panel 1.
  • the y coordinate of the touch point PI of the pair ⁇ can be calculated using the following formula: y 2
  • POyc is the y coordinate of the midpoint PO.
  • the y coordinates may be determined for the second touch point P2, by checking whether the read voltage VI is higher than the read voltage V2 of the layer 2 A and, if it is, determining the coordinates P2y of the touch point (P2) along the axis 2D of the layer 2B by subtracting half of said second value Ay from the coordinate POyc of the midpoint PO for such axis 2D of the layer 2B of the panel 1.
  • the y coordinate of the touch point P2 of the pair ⁇ can be calculated using the following formula: P2 ; : ,/ ⁇ C
  • the x coordinate of the touch points P I and P2 and the x coordinate of the touch point PI of the pair ⁇ may be calculated using the following formula:
  • POxc is the x coordinate of the midpoint P0
  • the pair of touch points PI , P2 is oriented along a diagonal that passes through the first and third quadrants of a Cartesian reference system centered in the midpoint P0xc,P0yc and hence with respect to the coordinates of the midpoint P0.
  • the two touch points PI , P2 have different potentials along the supply axis and the top right touch point (i.e. PI as shown in Figure 6) will have a higher potential than the bottom left touch point (i.e. P2 as shown in Figure 6).
  • This potential difference causes the potential of the reading terminalNl to be higher than the potential of the reading terminal V2.
  • the method advantageously comprises checking whether the voltage of the reading terminal VI is lower than the voltage of the reading terminal V2 of the first layer 2 A and if it is, determining the coordinates Ply of the first touch point PI along the axis 2D of the second layer 2B by summing half the value Ay to the y coordinate POyc of the midpoint P0 for the axis 2D of the second layer 2B.
  • the y coordinate of the touch point PI of the pair ⁇ can be calculated using the following formula:
  • POyc is the y coordinate of the midpoint P0.
  • the y coordinates may be determined for the second touch point P2, by checking whether the read voltage VI is lower than the read voltage V2 of the layer 2A and, if it is, determining the coordinates P2y of the touch point P2 along the axis 2D of the layer 2B by subtracting half of said second value Ay from the coordinate POyc of the midpoint PO for such axis 2D of the layer 2B of the panel 1.
  • the y coordinate of the touch point P2 of the pair ⁇ can be calculated using the following formula:
  • the x coordinate of the touch point PI of the pair ⁇ can be calculated using the following formula:
  • the method as described above may be used in any time discretization situation, both when the time distance between the first touch point PI and the second touch point P2 is lower than the time resolution of the electronic circuitry of the resistive touch screen panel 1 and when the time distance between the event of the first touch point PI and the second touch point P2 is higher than the time resolution of the resistive touch screen panel 1.
  • the method as described above is applicable either when the screen is touched at the two touch points PI and P2 substantially at the same time, or when the touch points PI and P2 are touched one after the other slow enough to allow detection by the control circuitry.
  • the coordinate of the first touch input made on the panel may be stored, until the second touch input occurs, ⁇ , Ay ( ⁇ , Ay being calculated with the technique as described in PCT/IT2009/000238) and the coordinates P0xc,P0yc of the midpoint PO (the coordinates P0xc,P0yc of the midpoint PO being calculated with the method as described in the present application or the technique as described in PCT/IT2009/000238) are acquired, to calculate an absolute value of the distance between the stored coordinate of the first touch input made on the panel and all the assumed coordinates determined after the touch input P2, and to determine the x,y coordinate at zero distance from those that have been stored.
  • the method includes the steps of:
  • d2_2 Plym-PlyJ.
  • the minimum distance value between the calculated coordinates Ply_s, ⁇ 1 ⁇ _ ⁇ , P2y_s, ⁇ 2 ⁇ _ ⁇ , ⁇ _ ⁇ , ⁇ 1 ⁇ _ ⁇ , ?2y_X, ⁇ 2 ⁇ _ ⁇ and the stored coordinates Plxm,Plym defines the point that is closest to the single touch point PI, in a single touch condition. Assuming that the first touch position is not considerably displaced between the single-touch input time and the multi- touch input time, then the determination of the multi-touch input coordinate that is closest to the single-touch input coordinate determines the quadrants of the axis of the two touch inputs.
  • PDAs Personal Digital Assistants
  • mobile phones notebooks, laptops, MP3 readers
  • gestures are typically used whereby pressure at the two touch points PI and P2 quickly and easily triggers functions (such as zoom, rotation, etc.) that would be otherwise only available through pressure of one or more special keys or through exploration of menus of said electronic devices.
  • the information concerning the current I 2x , I 2y (see Figures 3 and 4) circulating in the resistive touch screen 1 as a result of two touch inputs PI , P2 may be related to a magnification factor K of an object displayed on a screen, such as a text, an image, a vector figure, etc.
  • magnification factor Kz can be defined for both the axis 2C (defined as Kz, x) and the axis 2D (defined as Kz,y), i.e. for x axes and y axes respectively.
  • the method comprises:
  • the current value I t hdx is a predetermined value that is preferably equal to the value of the current that circulates in the first powered layer 2A, when such first layer 2A is touched at one point only.
  • I 2x ,ti and I 2y ,ti represent the currents as measured in the screen 2A and the layer 2B at the time tl respectively, with the threshold values I t hdx and Udy subtracted therefrom respectively (see Figures 3 and 4);
  • I 2 x.t2 and I 2y ,t2 represent the currents as measured in the screen 2A and the layer 2B at the time t2 respectively, with the threshold values I t hdx and I t hd y subtracted therefrom respectively (see Figures 3 and 4).
  • An overall magnification factor z may be also determined, using the following formula:
  • the text, image, vector figure on the screen may be magnified by modulating it with such a modulation factor ⁇ that:
  • ⁇ is a parameter that may be constant or depend, for instance, on the rate of increase of current I 2x and/or I 2y according to this possible formula: ⁇ ⁇ a - a a ⁇ t ⁇
  • the measure of the angle 9 curr ent between the orthogonal current components I 2x , I 2y may be related to a rotation factor 9 0 bj e ct of an object as it appears on the screen (text, image , costrumony vettoriale ecc.) in a relative or absolute manner.
  • angle 9 curre nt between the orthogonal current components I 2x , I 2y is defined as:
  • the rotation factor 9 0 bject can be defined in an absolute manner, using the following formula:
  • ⁇ is a constant parameter or depends on the rate of increase of current, according to the following relation:
  • the method of the present invention fulfills the above mentioned need and also obviates prior art drawbacks as set out in the introduction of this disclosure.

Abstract

La présente invention concerne un procédé destiné à déterminer de multiples entrées tactiles sur un écran tactile résistif, ledit écran comportant une première couche (2A) et une seconde couche (2B) présentant un premier axe (2C) et un second axe (2D) orthogonaux l'un à l'autre pouvant être définis sur celles-ci, ladite première couche étant conçue pour être touchée. Le procédé comprend les étapes consistant à toucher ladite première couche (2A) en un premier point de toucher (P1) tout en touchant également ladite première couche (2A) en un second point (P2) ; à alimenter la première couche (2A) avec une certaine valeur de tension (Vcc), pendant que ladite première couche (2A) est respectivement touchée en ledit premier point (P1) et ledit second point (P2) ; à détecter une première valeur de courant (I2, x) passant dans ladite première couche (2A) lorsque cette dernière est alimentée avec ladite valeur de tension (Vcc) ; à traiter ladite première valeur de courant (I2,x) pour calculer une première valeur (Δx) qui représente la différence de coordonnées le long d'un axe (2C) de la première couche (2A) entre les coordonnées dudit premier point de toucher (P1) et dudit second point de toucher (P2) ; à obtenir la première coordonnée (POxc) d'un point milieu (PO) par rapport aux coordonnées dudit premier point (P1) et dudit second point (P2) ; à traiter ladite première valeur (Δx) et la première coordonnée (POxc) dudit point milieu (PO) pour déterminer les coordonnées (P1x, P2x) dudit premier point de toucher (P1) et dudit second point de toucher (P2) le long dudit axe (2C) de la première couche (2A). Le procédé est caractérisé en ce que l'étape d'obtention de ladite première coordonnée (POxc) d'un point milieu (PO) permet la détection d'une première tension de lecture (V1) et d'une seconde tension de lecture (V2) de la seconde couche (2B) et le traitement d'une première tension de lecture (Vxc) qui est une valeur moyenne entre ladite première tension lue (V1) et ladite seconde tension lue (V2), afin d'obtenir ladite première coordonnée (POxc) d'un point milieu (PO).
PCT/IT2010/000476 2010-11-29 2010-11-29 Procédé amélioré pour déterminer des entrées tactiles multiples sur un écran tactile résistif WO2012073261A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP2811381A1 (fr) * 2013-06-05 2014-12-10 Spreadtrum Communications (Shanghai) Co., Ltd. Procédé et dispositif de détection tactile
CN104395870A (zh) * 2013-06-05 2015-03-04 展讯通信（上海）有限公司 触摸检测方法及装置
CN104395870B (zh) * 2013-06-05 2017-05-24 展讯通信（上海）有限公司 触摸检测方法及装置
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US10289248B2 (en) * 2016-04-08 2019-05-14 Rohm Co., Ltd. Control circuit and control method of touch panel, and touch panel input device and electronic device using the same
US10990236B2 (en) 2019-02-07 2021-04-27 1004335 Ontario Inc. Methods for two-touch detection with resistive touch sensor and related apparatuses and systems

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