WO2003052678A1 - Blindage pour ecran tactile - Google Patents

Blindage pour ecran tactile Download PDF

Info

Publication number
WO2003052678A1
WO2003052678A1 PCT/EP2002/013194 EP0213194W WO03052678A1 WO 2003052678 A1 WO2003052678 A1 WO 2003052678A1 EP 0213194 W EP0213194 W EP 0213194W WO 03052678 A1 WO03052678 A1 WO 03052678A1
Authority
WO
WIPO (PCT)
Prior art keywords
touch screen
layer
display
shielding
shielding barrier
Prior art date
Application number
PCT/EP2002/013194
Other languages
English (en)
Inventor
Dan Westberg
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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
Priority claimed from SE0104290A external-priority patent/SE521104C2/sv
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU2002366346A priority Critical patent/AU2002366346A1/en
Publication of WO2003052678A1 publication Critical patent/WO2003052678A1/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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds

Definitions

  • TITLE TOUCH SCREEN DISPLAY SHIELDING
  • the present invention relates to a touch screen display and a portable electronic device including a touch screen display having arrangements for shielding the display from high frequency radiated electromagnetic fields. DESCRIPTION OF RELATED ART
  • a well-known problem with electronic devices of any kind is that they can be disturbed by radiated electromagnetic fields.
  • Transmitting antennas generate electromagnetic fields, where the field strength depends on the distance from the antenna.
  • Occurrence of electrostatic discharge (ESD) can also generate radiated electromagnetic fields that could cause malfunction to devices and components.
  • ESD electrostatic discharge
  • JP-10163671 describes a touch panel connected to the shielding of a plasma display.
  • the touch panel is connected directly to the shielding via metal fittings. If the touch panel were to be used for shielding purposes it should be provided with a shielding layer. The document is however silent about this, why it is doubtful if the touch panel is used for shielding at all.
  • Another solution is to add a vaporized thin coat of metal . Unknowingly that degrades the contrast of the display and hence a lower readability is experienced. It is also hard to connect the metal coat to a zero volt reference like to the chassis or to a metal frame of any kind.
  • US 5,398,046 shows a faceplate for an interactive display terminal .
  • the touch screen section has an integrated shielding barrier in the form of a faceplate assembly having an electrically conductive grid connected to a ground potential.
  • the grid has a plurality of optical pipes with metal walls, which provide protection.
  • the prior art shielding barriers for electrically conducting touch panels are either too expensive, too bulky or contrast degrading because of the use of an extra shielding layer on the touch panel when shielding against radiated electromagnetic fields. There is thus a need for simpler and cheaper shielding against high frequency electromagnetic radiation.
  • capacitors to create a high frequency connection between the touch screen layers and the rest of the shielding barrier meets this object.
  • an improved shielding against radiated electromagnetic fields is obtained.
  • the object is further met by a touch screen display and a portable electronic device having such a display comprising a touch screen panel with at least one touch screen layer.
  • the layer is connected to a shielding barrier with capacitors as mentioned above .
  • a touch screen display and a portable electronic device including a touch screen display, where the display has a display layer and a touch screen panel with at least one first electrically conducting touch screen layer.
  • the portable electronic device and/or the display layer has an electromagnetic shielding barrier and at least one capacitor is connected between the touch screen layer and the electromagnetic shielding barrier for providing a high frequency shielding barrier.
  • the touch panel itself is used as shielding using a high-frequency connection between the touch screen and the main shielding barrier without affecting the functioning of the touch screen.
  • Fig. 1 shows a cellular phone in which the invention is implemented
  • Fig. 2 shows a side view of the shielding in the phone of fig. 1 and Fig. 3 shows a simplified view depicting an embodiment of the invention.
  • a portable electronic device in the form of a cellular phone 10, which includes a touch screen 12 and an antenna 14.
  • Electronic devices having a touch screen could e.g. also be a PDA (Personal Digital Assistant) , a smart phone (combined mobile phone and PDA) , a lap top computer or a handheld game machine. Even larger electronic devices such as PCs and television sets could possibly be equipped with touch screens now or in the future .
  • the device is subject to strong high frequency electromagnetic fields through the antenna 14.
  • the frequency is decided by the type of network used, where certain frequency bands are to be used for transmission and reception of speech and data. There is generally a trend towards higher frequencies as these types of networks are designed to transfer more and more data. Examples of such networks are GSM, DAMPS, CDMA, WCDMA and GPRS.
  • Fig. 2 shows a side view of parts of the interior of the cellular phone of fig. 1.
  • the phone includes phone logic 28 and phone shielding 26 surrounding the phone logic 28.
  • the phone shielding could be part of the frame of the phone .
  • the touch screen of fig. 1, also called touch sensitive display comprises an LCD display (Liquid Crystal Display) 16 or display layer, on top of which a first 20 and a second 18 touch screen layer are provided.
  • the two touch screen layers together form a touch screen panel .
  • the touch screen layers are provided e.g. with a touch sensitive foil or a corresponding technique known as such identifying also the location of a touch point on the display.
  • the touch screen layers 18 and 20 preferably comprises a plurality of activation areas for activating the function of the device provided with the display.
  • the display layer 16 also preferably comprises at least one display area for showing variable data, such as telephone numbers, short messages, calculations etc.
  • the user activates functions usually by using a finger and a light pressing on the touch screen.
  • a pen-like object or the like can also be used, in case the identification technique used at the time allows.
  • the size and positioning of these activation areas and the display area can vary.
  • the activation is, .done by using the two touch screen layers, which are both electrically conducting. How this is done is something well known within the art and is not further explained here.
  • the touch screen layers 18, 20 are however connected to the phone logic 28 in order to be able to take care of the touch inputs.
  • the LCD 16 is likewise electrically connected to the phone logic 28 in order to be controlled.
  • the LCD layer 16 is provided with a shielding foil 30 having zero voltage.
  • the shielding foil 30 is surrounding the whole of the side of LCD layer 16 or the whole perimeter of the layer.
  • the shielding 30 could equally as well have been provided in the form of a box.
  • the LCD shielding 30 is connected to the phone shielding 26. In this way the LCD shielding 30 becomes part of the phone shielding 26.
  • the display does not have to be a LCD, but other types of displays are also feasible as long as they are covered with a touch screen layer.
  • Both of the conductive touch screen layers 18 and 20 are in fig. 2 used as a part of the shielding barrier for high frequency electromagnetic radiation by connecting them to the LCD shielding 30 using capacitors 22 and 24, respectively. It is also feasible to use only one of the touch screen layers as a part of the shielding barrier. By using capacitors, a low impedance, high frequency connection between the touch screen layers and the rest of or the main shielding barrier is obtained.
  • the LCD shielding barrier 30 and one touch screen layer 20 are in themselves the plates of a first capacitor 24, while the LCD shielding barrier 30 and the other touch screen layer 18 are the plates of a second capacitor 22.
  • the layers 18, 20 and shielding foil 30 are then separated by a suitable medium having good dielectrical properties or a dielectrical constant suitable for the capacitor.
  • This medium can be some kind of glue or a plastic foil.
  • the capacitance is decided by the area of the plates, the distance between them and the dielectrical constant of the medium. The medium is selected and the different layers are dimensioned, spaced apart and possibly displaced in relation to one another, in such a way that a capacitance suitable for short circuiting the touch screen layer and the LCD shielding for a high frequency is obtained.
  • the capacitance could naturally be connected between a touch screen layer and the shielding of the phone instead of the LCD shielding. It is also possible to have only one of the layers being shielded by a capacitor, while the other layer is not.
  • FIG. 3 is shown an elevational view of a preferred embodiment of the invention, where the touch screen layers 18 and 20 are connected to the LCD shielding 30. Also the
  • LCD layer 16 is shown.
  • capacitors 22, 24 connected between layers 18, 20 and the LCD shielding 30.
  • the capacitors 22 are here provided between the layer 18 and the LCD shielding 30 on two opposite sides of the touch screen layer 18, while two opposite sides of the layer 18 do not have any capacitors.
  • the other touch panel layer 20 has capacitors 24 connected to the LCD shielding 30.
  • the number of capacitors is not a crucial matter for the functioning of the touch screen panel but if they are equally distanced along the perimeter of the LCD layer, they ensure a good protection against electromagnetic fields.
  • the "opening" formed by the display is no longer an opening anymore in terms of radiated electromagnetic fields at high frequencies, but are instead an integral part of the radiated electromagnetic field protection.
  • the capacitors that are connected between the touch screen layers and the rest of the shielding barrier need to be safely attached to these surfaces .
  • the touch screen layers could have screen printed connectors that the capacitor could attach to by using electrically conductive glue.
  • the contacting of the capacitors to the main shielding barrier could be realised with some kind of contact spring means. Glueing could be an alternative also here.
  • the attachment of the capacitors to the layers and to the rest of the shielding barrier is an open question which has to be adapted to mechanical design and should not be a limitation to the invention.
  • the capacitors can as an alternative be provided in the form of thin film circuits which are bonded to the touch screen layers and LCD shielding.
  • the LCD shielding barrier 30 could be of many types and shapes.
  • the LCD shielding barrier 30 is formed as a plate of a conductive material, lying around the sides or perimeter of the LCD layer 16.
  • Another possible embodiment is to have the LCD shielding barrier surrounding the touch screen like a frame.
  • Other shapes and locations of the LCD shielding barrier are possible and the invention is not intended to be limited by any such constraints of the shielding of either the display or the portable electronic device. It suffices that there is a shielding.
  • the invention can be used with only one touch screen layer being capacitively coupled to the LCD or phone shielding. Having two layers coupled is however better, since then the shielding effectiveness will be doubled, while the functioning of each layer will not be influenced negatively. In both cases there can be more than one capacitor.

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)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

La présente invention concerne un écran tactile et un dispositif électronique portatif qui comprend un écran tactile, ledit écran comportant une couche d'affichage (16) et un panneau tactile avec au moins une couche d'écran tactile conductrice d'électricité (20). Ce dispositif électronique portatif comprend une barrière de blindage électromagnétique (30), dans laquelle au moins un condensateur (24) est connecté entre la couche d'écran tactile (20) et la barrière de blindage électromagnétique (30) de façon à former une barrière de blindage haute fréquence.
PCT/EP2002/013194 2001-12-17 2002-11-25 Blindage pour ecran tactile WO2003052678A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002366346A AU2002366346A1 (en) 2001-12-17 2002-11-25 Touch screen display shielding

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE0104290-2 2001-12-17
SE0104290A SE521104C2 (sv) 2001-12-17 2001-12-17 Avskärmning för pekbildskärm
US34536602P 2002-01-02 2002-01-02
US60/345,366 2002-01-02

Publications (1)

Publication Number Publication Date
WO2003052678A1 true WO2003052678A1 (fr) 2003-06-26

Family

ID=26655629

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/013194 WO2003052678A1 (fr) 2001-12-17 2002-11-25 Blindage pour ecran tactile

Country Status (2)

Country Link
AU (1) AU2002366346A1 (fr)
WO (1) WO2003052678A1 (fr)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007021571A2 (fr) * 2005-08-12 2007-02-22 3M Innovative Properties Company Ecran tactile faiblement sensible a la perturbation radioelectrique
US8044942B1 (en) 2011-01-18 2011-10-25 Aevoe Inc. Touch screen protector
EP2503478A3 (fr) * 2011-03-22 2012-11-14 Erbe Elektromedizin GmbH Dispositif et procédé d'entrée de signaux sécurisée
CN104330085A (zh) * 2014-11-20 2015-02-04 天津市中环电子计算机有限公司 一种舰载北斗导航显示系统
US8974620B2 (en) 2010-05-14 2015-03-10 Racing Optics, Inc. Touch screen shield
US9061542B1 (en) 2014-09-02 2015-06-23 Aevoe International Ltd. Glass touch screen protector
US9063699B1 (en) 2014-09-02 2015-06-23 Aevoe International Ltd. Glass touch screen protector
US9092195B1 (en) 2014-09-30 2015-07-28 Aevoe International Ltd. Glass touch screen protector
USD747320S1 (en) 2013-07-01 2016-01-12 3M Innovative Properties Company Curved screen protector for an electronic device
US9274625B2 (en) 2010-05-14 2016-03-01 Racing Optics, Inc. Touch screen shield
US9283731B2 (en) 2012-05-22 2016-03-15 Aevoe International Ltd. Touch screen protector
US9292128B1 (en) 2015-02-25 2016-03-22 Aevoe International Ltd. Touch screen protector with glass and conformable outer perimeter
US9295297B2 (en) 2014-06-17 2016-03-29 Racing Optics, Inc. Adhesive mountable stack of removable layers
US9541961B1 (en) 2015-08-25 2017-01-10 Microsoft Technology Licensing, Llc Shielding via display chassis
US10067606B2 (en) 2013-12-31 2018-09-04 General Electric Company Touch screen display device and method of touch input control
US10185058B2 (en) 2013-07-01 2019-01-22 3M Innovative Properties Company Protection film suitable for illuminated display devices
US10620670B2 (en) 2010-05-14 2020-04-14 Racing Optics, Inc. Touch screen shield
US11307329B1 (en) 2021-07-27 2022-04-19 Racing Optics, Inc. Low reflectance removable lens stack
US11364715B2 (en) 2019-05-21 2022-06-21 Racing Optics, Inc. Polymer safety glazing for vehicles
US11490667B1 (en) 2021-06-08 2022-11-08 Racing Optics, Inc. Low haze UV blocking removable lens stack
US11524493B2 (en) 2019-02-01 2022-12-13 Racing Optics, Inc. Thermoform windshield stack with integrated formable mold
US11548356B2 (en) 2020-03-10 2023-01-10 Racing Optics, Inc. Protective barrier for safety glazing
US11648723B2 (en) 2019-12-03 2023-05-16 Racing Optics, Inc. Method and apparatus for reducing non-normal incidence distortion in glazing films
US11709296B2 (en) 2021-07-27 2023-07-25 Racing Optics, Inc. Low reflectance removable lens stack
US11808952B1 (en) 2022-09-26 2023-11-07 Racing Optics, Inc. Low static optical removable lens stack
US11846788B2 (en) 2019-02-01 2023-12-19 Racing Optics, Inc. Thermoform windshield stack with integrated formable mold
US11933943B2 (en) 2022-06-06 2024-03-19 Laminated Film Llc Stack of sterile peelable lenses with low creep
US12038789B2 (en) 2023-03-23 2024-07-16 Ro Technologies, Llc Touch screen shield

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636582A (en) * 1983-08-31 1987-01-13 Toppan Moore Co., Ltd. Signal input sheet having a conductive shield layer
US5486847A (en) * 1992-12-21 1996-01-23 Ncr Corporation Apparatus for a stylus input system for shielding RFI/EMI fields
JPH10163671A (ja) * 1996-11-28 1998-06-19 Mitsubishi Electric Corp プラズマディスプレイ装置
US6002389A (en) * 1996-04-24 1999-12-14 Logitech, Inc. Touch and pressure sensing method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636582A (en) * 1983-08-31 1987-01-13 Toppan Moore Co., Ltd. Signal input sheet having a conductive shield layer
US5486847A (en) * 1992-12-21 1996-01-23 Ncr Corporation Apparatus for a stylus input system for shielding RFI/EMI fields
US6002389A (en) * 1996-04-24 1999-12-14 Logitech, Inc. Touch and pressure sensing method and apparatus
JPH10163671A (ja) * 1996-11-28 1998-06-19 Mitsubishi Electric Corp プラズマディスプレイ装置

Non-Patent Citations (1)

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Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 11 30 September 1998 (1998-09-30) *

Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101243385B (zh) * 2005-08-12 2012-05-02 3M创新有限公司 具有降低对射频干扰的敏感性的触摸屏
WO2007021571A3 (fr) * 2005-08-12 2007-08-02 3M Innovative Properties Co Ecran tactile faiblement sensible a la perturbation radioelectrique
WO2007021571A2 (fr) * 2005-08-12 2007-02-22 3M Innovative Properties Company Ecran tactile faiblement sensible a la perturbation radioelectrique
US11625072B2 (en) 2010-05-14 2023-04-11 Racing Optics, Inc. Touch screen shield
US8974620B2 (en) 2010-05-14 2015-03-10 Racing Optics, Inc. Touch screen shield
US10620670B2 (en) 2010-05-14 2020-04-14 Racing Optics, Inc. Touch screen shield
US10345934B2 (en) 2010-05-14 2019-07-09 Racing Optics, Inc. Touch screen shield
US9104256B2 (en) 2010-05-14 2015-08-11 Racing Optics, Inc. Touch screen shield
US9128545B2 (en) 2010-05-14 2015-09-08 Racing Optics, Inc. Touch screen shield
US9471163B2 (en) 2010-05-14 2016-10-18 Racing Optics, Inc. Touch screen shield
US9274625B2 (en) 2010-05-14 2016-03-01 Racing Optics, Inc. Touch screen shield
US9582040B2 (en) 2011-01-18 2017-02-28 Aevoe Corp. Touch screen protector
US9582039B2 (en) 2011-01-18 2017-02-28 Aevoe Corp. Touch screen protector
US8044942B1 (en) 2011-01-18 2011-10-25 Aevoe Inc. Touch screen protector
US10401988B2 (en) 2011-01-18 2019-09-03 Aevoe Corp. Touch screen protector
WO2012126682A3 (fr) * 2011-03-22 2012-11-29 Erbe Elektromedizin Gmbh Procédé et dispositif de saisie de signaux fiable
EP2503478A3 (fr) * 2011-03-22 2012-11-14 Erbe Elektromedizin GmbH Dispositif et procédé d'entrée de signaux sécurisée
US9283731B2 (en) 2012-05-22 2016-03-15 Aevoe International Ltd. Touch screen protector
US10185058B2 (en) 2013-07-01 2019-01-22 3M Innovative Properties Company Protection film suitable for illuminated display devices
USD747320S1 (en) 2013-07-01 2016-01-12 3M Innovative Properties Company Curved screen protector for an electronic device
US10067606B2 (en) 2013-12-31 2018-09-04 General Electric Company Touch screen display device and method of touch input control
US10070678B2 (en) 2014-06-17 2018-09-11 Racing Optics, Inc. Adhesive mountable stack of removable layers
US11622592B2 (en) 2014-06-17 2023-04-11 Racing Optics, Inc. Adhesive mountable stack of removable layers
US9968155B2 (en) 2014-06-17 2018-05-15 Racing Optics, Inc. Adhesive mountable stack of removable layers
US9526290B2 (en) 2014-06-17 2016-12-27 Racing Optics, Inc. Adhesive mountable stack of removable layers
US9295297B2 (en) 2014-06-17 2016-03-29 Racing Optics, Inc. Adhesive mountable stack of removable layers
US10226095B2 (en) 2014-06-17 2019-03-12 Racing Optics, Inc. Adhesive mountable stack of removable layers
US10321731B2 (en) 2014-06-17 2019-06-18 Racing Optics, Inc. Adhesive mountable stack of removable layers
US9063699B1 (en) 2014-09-02 2015-06-23 Aevoe International Ltd. Glass touch screen protector
US9061542B1 (en) 2014-09-02 2015-06-23 Aevoe International Ltd. Glass touch screen protector
US9760121B2 (en) 2014-09-30 2017-09-12 Aevoe International Ltd. Method for using glass touch screen protector
US9092195B1 (en) 2014-09-30 2015-07-28 Aevoe International Ltd. Glass touch screen protector
CN104330085A (zh) * 2014-11-20 2015-02-04 天津市中环电子计算机有限公司 一种舰载北斗导航显示系统
US9292128B1 (en) 2015-02-25 2016-03-22 Aevoe International Ltd. Touch screen protector with glass and conformable outer perimeter
US10156872B2 (en) 2015-08-25 2018-12-18 Microsoft Technology Licensing, Llc Shielding via display chassis
US9541961B1 (en) 2015-08-25 2017-01-10 Microsoft Technology Licensing, Llc Shielding via display chassis
US11845249B2 (en) 2019-02-01 2023-12-19 Racing Optics, Inc. Thermoform windshield stack with integrated formable mold and method
US11524493B2 (en) 2019-02-01 2022-12-13 Racing Optics, Inc. Thermoform windshield stack with integrated formable mold
US11846788B2 (en) 2019-02-01 2023-12-19 Racing Optics, Inc. Thermoform windshield stack with integrated formable mold
US11364715B2 (en) 2019-05-21 2022-06-21 Racing Optics, Inc. Polymer safety glazing for vehicles
US11833790B2 (en) 2019-05-21 2023-12-05 Racing Optics, Inc. Polymer safety glazing for vehicles
US12017398B2 (en) 2019-12-03 2024-06-25 Ro Technologies, Llc Method and apparatus for reducing non-normal incidence distortion in glazing films
US11648723B2 (en) 2019-12-03 2023-05-16 Racing Optics, Inc. Method and apparatus for reducing non-normal incidence distortion in glazing films
US11548356B2 (en) 2020-03-10 2023-01-10 Racing Optics, Inc. Protective barrier for safety glazing
US11807078B2 (en) 2020-03-10 2023-11-07 Racing Optics, Inc. Protective barrier for safety glazing
US11723420B2 (en) 2021-06-08 2023-08-15 Racing Optics, Inc. Low haze UV blocking removable lens stack
US11490667B1 (en) 2021-06-08 2022-11-08 Racing Optics, Inc. Low haze UV blocking removable lens stack
US11709296B2 (en) 2021-07-27 2023-07-25 Racing Optics, Inc. Low reflectance removable lens stack
US11624859B2 (en) 2021-07-27 2023-04-11 Racing Optics, Inc. Low reflectance removable lens stack
US11988850B2 (en) 2021-07-27 2024-05-21 Laminated Film Llc Low reflectance removable lens stack
US11307329B1 (en) 2021-07-27 2022-04-19 Racing Optics, Inc. Low reflectance removable lens stack
US11933943B2 (en) 2022-06-06 2024-03-19 Laminated Film Llc Stack of sterile peelable lenses with low creep
US11808952B1 (en) 2022-09-26 2023-11-07 Racing Optics, Inc. Low static optical removable lens stack
US12038789B2 (en) 2023-03-23 2024-07-16 Ro Technologies, Llc Touch screen shield

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