EP1588247A2 - Dispositif d'affichage tactile - Google Patents

Dispositif d'affichage tactile

Info

Publication number
EP1588247A2
EP1588247A2 EP03768063A EP03768063A EP1588247A2 EP 1588247 A2 EP1588247 A2 EP 1588247A2 EP 03768063 A EP03768063 A EP 03768063A EP 03768063 A EP03768063 A EP 03768063A EP 1588247 A2 EP1588247 A2 EP 1588247A2
Authority
EP
European Patent Office
Prior art keywords
touch sensitive
display device
layer
sensitive display
layers
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP03768063A
Other languages
German (de)
English (en)
Inventor
Galileo J. A. Destura
Cees Van Berkel
Peter A. Cirkel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP03768063A priority Critical patent/EP1588247A2/fr
Publication of EP1588247A2 publication Critical patent/EP1588247A2/fr
Withdrawn legal-status Critical Current

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
    • G06F3/048—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
    • 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
    • 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

Definitions

  • the invention relates to a touch sensitive display device with a multiple of picture elements and having means for applying driving voltages to said picture elements the display device.
  • the display device is for instance a liquid crystal display device.
  • Liquid crystal display devices have found widespread use in the computer industry and in handheld devices ranging from mobile telephones and price tags to palm top computers and organizers. Also the combination with a touching device such as a stylus has found widespread applications, while also a need for ways of providing input via the display screen is felt.
  • USP 5,777,596 describes a touch sensitive liquid crystal display device that allows putting input into the associated device (e.g. a computer) by simply touching the display screen with a finger, a stylus or a pen.
  • the device continuously compares the charge time of the liquid crystal display elements (picture elements) to a reference value and uses the result of the comparison to determine which elements are being touched.
  • One of the problems in said touch sensitive liquid crystal display device resides in restoring the right image after sensing. This is due to the fact that a blinking line is used which represents the switching of all picture elements in a row between two extreme states. When the blinking line reaches a certain row touching is detected by measuring the charging time of the picture elements. After measuring the picture elements are provided with adequate voltages to display the right image. In a similar way sensing by means of a blinking spot is disclosed in USP 5,777,596.
  • DC bias voltages may be present whereby charging differs for writing odd or even frames.
  • DC -driving methods low power liquid crystal displays, electrophoretic displays
  • no inversion occurs so the method cannot be used at all there.
  • a touch sensitive display device comprises a layer of touch sensitive material, the touch sensitive display device having means for monitoring the electrical characteristics of said layer of touch sensitive material and sensing a change in said electrical characteristics.
  • the display structure By incorporating a layer with pressure sensitive characteristics (e.g. non-linear resistivity such as may be realized by means of quantum tunneling composites or a piezoresistive layer) into the display structure, the display structure itself becomes intrinsically touch sensitive.
  • a layer with pressure sensitive characteristics e.g. non-linear resistivity such as may be realized by means of quantum tunneling composites or a piezoresistive layer
  • the pressure sensitive layer is sandwiched in between two optical films (retardation film, polarizer film, etc.) which are in front of the display cell or in between the display cell and one of these optical layers, deteriorating of the front of screen performance due to air-substrate interfaces in front of the device, which refract and reflect light is prevented.
  • two optical films retardation film, polarizer film, etc.
  • Figure 1 schematically shows a touch sensitive (liquid crystal) display device
  • Figures 2 shows a cross-sections of a part of a touch sensitive (liquid crystal) display device according to the invention
  • Figures 3 and 4 show the principle of determining the coordinates of touching a touch sensitive (liquid crystal) display device according to the invention.
  • Figure 5 shows a further embodiment of a touch sensitive (liquid crystal) display device according to the invention.
  • Figure 1 is an electric equivalent circuit diagram of a part of a touch sensitive display device 1 to which the invention is applicable. It comprises in one possible embodiment (one mode of driving, called the "passive mode") a matrix of picture elements 8 defined by the areas of crossings of row or selection electrodes 7 and column or data electrodes 6.
  • the row electrodes are consecutively selected by means of a row driver 4, while the column electrodes are provided with data via a data register 5.
  • incoming data 2 are first processed, if necessary, in a processor 3.
  • Mutual synchronization between the row driver 4 and the data register 5 takes place via drive lines 9.
  • signals from the row driver 4 select the picture electrodes via thin- film transistors (TFTs) 10 whose gate electrodes are electrically connected to the row electrodes 7 and the source electrodes are electrically connected to the column electrodes.
  • TFTs thin-film transistors
  • the signal which is present at the column electrode 6 is transferred via the TFT to a picture electrode of a picture element 8 coupled to the drain electrode.
  • the other picture electrodes are connected to, for example, one (or more) common counter electrode(s).
  • TFTs thin-film transistor
  • Figure 2 shows a cross-section of apart of a touch sensitive liquid crystal device having a bottom substrate 11 and an upper substrate 12 with a liquid crystal layer 13 between said substrates.
  • the touch sensitive liquid crystal device has (not shown) picture electrodes on the bottom substrate 11 and on the other substrate 12.
  • the display device in this example further comprises a polarizer 14, an analyzer 15, a backlight structure 18 and in this particular example a further optical layer 16 such as for instance a quarter lambda plate and a protective layer 17.
  • a structure or layer 19 with pressure sensitive characteristics is provided, in this particular example between the bottom substrate 11 and the polarizer 14.
  • the pressure sensitive structure or layer 19 in this example has pressure sensitive particles 22 together with spacer particles 21 between two transparent conducting layers 20 (e.g. indium tin oxide).
  • QTC Quantum Tunneling Composites
  • the space separation of the particles is reduced by the presence of the dendrites. At a certain loading point, the space separation of the particles becomes close enough to enable the electrons from one particle to jump to the other particle through the dendrites. However, the dendrites from two different particles are still not in contact with each other. The quantum tunneling act of the electrons leads to rapid resistivity decrease of the material as a whole.
  • QTC is a pressure/force sensitive switching material whose switching properties are comparable to these of a mechanical switch. Moreover it can be moulded into different shapes and can be mixed with other polymers.
  • normal polymer non-conducting spherical spacers 21 prevent the QTC spacers 22 from being overloaded and going to plasticity.
  • Another function of the normal polymer spacer is to ensure that there is no shorting between the upper and lower layers 20.
  • the diameter of the QTC spacer 22 preferably is less than or equal to the size of the normal polymer spacer 21.
  • the sensitive layer can be a mixture of compressible bonding material, such as a silicone rubber mixed with conducting spherical spacers, having a diameter smaller than the thickness of the layer of compressible silicone rubber.
  • FIG. 3 a is an electrical equivalent of the pressure sensitive structure or layer 19, by means of the variable resistor 23.
  • Figures 3 and 4 show how the impedance between the upper and lower electrode is monitored.
  • a rapid drop in resistance indicates a touch action.
  • the amount of pressure is determined by measuring the impedance of the pressure sensitive structure or layer 19. Said resistance is
  • V - V ⁇ R QTC ⁇ r R- read m which R rea d is a readout resistor, indicated in Figure 3 by the
  • the sensing system then may proceed to detect the x y co-ordinates by means of using one of the electrodes 20 as a probe. As shown in Figures 3b and 3 c the voltage N s is applied to the edges of an electrode 20, either directly or via mutually insulated low - impedance strips 24, such as metal strips. In one direction (y), if the picture element has a
  • V T R r spacer layer upon touching.
  • V read ead —
  • the sensing system starts with a calibration step 31 ( Figure 4) in which the values of N s are calibrated (e.g. V s (0, H) and N s (W,0) together with N s (0,0), the latter generally being ground. Then the sensing system, if necessary after being switched on (step 32) goes to the touch detect mode (step 33) The sensing system then may proceed to detect the x - y co-ordinates by means of using one of the electrodes 20 as a probe. Indication of a touch action is determined by measuring the amount of pressure (e.g. by measuring the impedance of the pressure sensitive structure or layer 19, Figure 3a).
  • the sensing system then may proceed to detect the x y co-ordinates by means of using the method Figures 3b and 3 c (step 36) and then return to the touch detect mode (arrow 37). If a too small amount of pressure is present the sensing system immediately returns to the touch detect mode (arrow 35).
  • the pressure sensitive layer may also be present between two optical films (in this case a retardation film 16 and a polarizer 15, but other kinds of optical films, like mirror layers, reflective and transflective layers are possible too) in front of the display device.
  • the pressure sensitive layer may also be present in between the substrate 13 of the display device and one of these optical layers. In this case no extra films are used in front of the display cell and the number of air-substrate interfaces, which refract and reflect light, in front of the screen is reduced.
  • the protective scope of the invention is not limited to the embodiments described, while the invention is also applicable to other display devices, for example, emissive, electrochromic and elecfrowetting displays.
  • the normal polymer spacers 21 as shown in Figure 2 need not always be present.
  • flexible substrates may be used (wearable displays, wearable electronics).

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Push-Button Switches (AREA)

Abstract

L'invention concerne un dispositif d'affichage tactile fabriqué par introduction d'une couche tactile (19) entre les deux couches optiques (4, 15, 16) ou entre un substrat (11, 12) et une autre couche optique (14, 15, 16).
EP03768063A 2003-01-20 2003-12-24 Dispositif d'affichage tactile Withdrawn EP1588247A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03768063A EP1588247A2 (fr) 2003-01-20 2003-12-24 Dispositif d'affichage tactile

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP03100097 2003-01-20
EP03100097 2003-01-20
EP03768063A EP1588247A2 (fr) 2003-01-20 2003-12-24 Dispositif d'affichage tactile
PCT/IB2003/006339 WO2004066136A2 (fr) 2003-01-20 2003-12-24 Dispositif d'affichage tactile

Publications (1)

Publication Number Publication Date
EP1588247A2 true EP1588247A2 (fr) 2005-10-26

Family

ID=32748918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03768063A Withdrawn EP1588247A2 (fr) 2003-01-20 2003-12-24 Dispositif d'affichage tactile

Country Status (7)

Country Link
EP (1) EP1588247A2 (fr)
JP (1) JP2006513501A (fr)
KR (1) KR20050100625A (fr)
CN (1) CN1739087A (fr)
AU (1) AU2003292482A1 (fr)
TW (1) TWM256560U (fr)
WO (1) WO2004066136A2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012899A1 (fr) 2005-07-25 2007-02-01 Plastic Logic Limited Ecran tactile flexible
GB0515175D0 (en) 2005-07-25 2005-08-31 Plastic Logic Ltd Flexible resistive touch screen
GB0611032D0 (en) 2006-06-05 2006-07-12 Plastic Logic Ltd Multi-touch active display keyboard
US20090122017A1 (en) * 2007-11-09 2009-05-14 Motorola, Inc. Mobile electronic device having capacitive sensor with reduced visibility isolation areas and corresponding method
KR101432569B1 (ko) * 2007-11-20 2014-08-21 엘지디스플레이 주식회사 터치스크린을 구비한 액정표시장치 및 그 제조방법
US9018030B2 (en) 2008-03-20 2015-04-28 Symbol Technologies, Inc. Transparent force sensor and method of fabrication
KR101703780B1 (ko) * 2008-12-15 2017-02-07 코닌클리케 필립스 엔.브이. 사용자 인터페이스 장치 및 방법
GB2468870B (en) * 2009-03-25 2016-08-03 Peratech Holdco Ltd Sensor
US8988191B2 (en) 2009-08-27 2015-03-24 Symbol Technologies, Inc. Systems and methods for pressure-based authentication of an input on a touch screen
US20120019448A1 (en) * 2010-07-22 2012-01-26 Nokia Corporation User Interface with Touch Pressure Level Sensing
US8963874B2 (en) 2010-07-31 2015-02-24 Symbol Technologies, Inc. Touch screen rendering system and method of operation thereof
CN106019676B (zh) * 2016-07-29 2020-11-06 京东方科技集团股份有限公司 显示基板、显示面板
CN109782956B (zh) * 2019-01-22 2020-06-02 上海大学 一种显示面板制造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4814760A (en) * 1984-12-28 1989-03-21 Wang Laboratories, Inc. Information display and entry device
US5777596A (en) * 1995-11-13 1998-07-07 Symbios, Inc. Touch sensitive flat panel display
US5949501A (en) * 1996-02-13 1999-09-07 Kabushiki Kaisha Pilot Coordinates input device using liquid crystal sheet
FI962692A (fi) * 1996-06-28 1997-12-29 Nokia Mobile Phones Ltd Kosketusherkkä näyttö ja päätelaite
GB2321707B (en) * 1997-01-31 2000-12-20 John Karl Atkinson A means for determining the x, y and z co-ordinates of a touched surface
ATE502320T1 (de) * 1999-07-01 2011-04-15 E Ink Corp Elektrophoretisches medium versehen mit abstandselementen
JP2001075074A (ja) * 1999-08-18 2001-03-23 Internatl Business Mach Corp <Ibm> タッチセンサ一体型液晶表示素子
JP2003536307A (ja) * 2000-05-22 2003-12-02 デジット ワイヤレス，エルエルシー 入力装置とその入力方法
AU2003247082A1 (en) * 2002-08-01 2004-02-23 Koninklijke Philips Electronics N.V. Touch sensitive display device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2004066136A3 *

Also Published As

Publication number Publication date
AU2003292482A8 (en) 2004-08-13
WO2004066136A3 (fr) 2004-12-16
TWM256560U (en) 2005-02-01
WO2004066136A2 (fr) 2004-08-05
CN1739087A (zh) 2006-02-22
AU2003292482A1 (en) 2004-08-13
KR20050100625A (ko) 2005-10-19
JP2006513501A (ja) 2006-04-20

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