EP1913461A2 - Ecran tactile - Google Patents

Ecran tactile

Info

Publication number
EP1913461A2
EP1913461A2 EP06764303A EP06764303A EP1913461A2 EP 1913461 A2 EP1913461 A2 EP 1913461A2 EP 06764303 A EP06764303 A EP 06764303A EP 06764303 A EP06764303 A EP 06764303A EP 1913461 A2 EP1913461 A2 EP 1913461A2
Authority
EP
European Patent Office
Prior art keywords
electrode
active layer
electrodes
touch screen
display surface
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Withdrawn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
EP06764303A
Other languages
German (de)
English (en)
Inventor
Jens FÜRST
Debora Henseler
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1913461A2 publication Critical patent/EP1913461A2/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Withdrawn legal-status Critical Current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
    • G06F3/03—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
    • 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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels

Definitions

  • the invention relates to a touch screen.
  • a touch screen includes a display panel, such as an LCD panel, and a touch-sensitive sensor panel. When touched, the sensor field responds, for example, to trigger a selected action or application.
  • Touch screens become u. a. used for private and industrial applications as a relatively simple and fast input option.
  • the touch screen may e.g. with a finger, as u. a. at ATMs, or served by a pen, as is the case with some PDAs.
  • the display panel and the touch-sensitive sensor field are usually produced as separate components and mechanically connected to one another.
  • the sensor array typically relies on a conventional display panel-like display, such as a display panel. an LCD, CRT or plasma screen, and is deposited on a separate substrate.
  • a display panel-like display such as a display panel. an LCD, CRT or plasma screen
  • touch screens are known in which the sensor array and the display panel are constructed on a common planar substrate.
  • the one planar side of the substrate is in this case provided with the display panel and the other planar side of the substrate is provided with the sensor field.
  • Resistive, capacitive and optical sensor fields are examples of well-known sensor fields.
  • WO 03/043294 A1 also discloses a multifunctional communication device with mechanical, acoustic, visual input and output means as well as transmitting and receiving devices for communication with other communication devices.
  • the visual input / output means is designed as a unit which can be rolled out of the communication device, can be pulled out, folded and / or folded.
  • Object of the present invention is to provide conditions for a touch screen can be performed as thin as possible.
  • a touch screen comprising a display surface, a structured planar first electrode comprising a plurality of first partial electrodes, a planar second electrode, and at least one first active layer disposed between the first and second electrodes, wherein the first partial electrodes first electrodes are driven so as to cooperate with the second electrode and the first active layer disposed therebetween, thereby displaying an image on the display surface, and organic photodetectors integrated with the touch screen having at least one second active layer of an organic material in which a signal associated with the touch location of the display surface is applied to the organic photodetectors when the display surface is touched.
  • image is to be understood in the broadest sense, so under an "image” in particular also displayed letters, numbers and
  • Suitable bendable or flexible display panels include polymer electronic components, display elements based on electrochromic materials, electrophoretic display elements, possibly also LCDs, but above all display elements based on organic materials, such as organic LEDs.
  • Organic LEDs are self-luminous, which is why a backlight can be dispensed with.
  • Electrochromic displays are readable like "electronic paper" because of their color change, and they also do not require backlighting, so that such a display panel can also be used as a touch screen, the sensor array should also be flexible or flexible Organic photodetectors are as flexible or flexible as organic According to the invention, the touch screen according to the invention therefore comprises organic photodetectors as touch-sensitive elements, which are also integrated in the touch screen. By integrating the photodetectors in the touch screen, it is possible to make the touch screen only slightly thicker than a display device without touch-sensitive elements ,
  • the planar first electrode additionally comprises second partial electrodes
  • the first active layer arranged between the first and second electrodes is an active layer of an organic material and the organic photodetectors comprise the second partial electrodes of the first electrode, thus upon touching the display surface, a signal associated with the touch location of the display surface is applied to the second sub-electrodes.
  • the touch screen according to the invention essentially comprises a pair of electrodes with at least one active layer of organic material interposed therebetween.
  • the first electrode is structured and comprises the first partial electrodes. These are driven so that an image to be displayed with the touch screen appears on the display surface.
  • a partial electrode of the first partial electrodes with subsequent organic active layer, the first active layer, and second electrode thus substantially corresponds to an organic LED. Each of these organic LEDs is in turn associated with a pixel of the displayed image.
  • Organic materials for the first active layer are, for example, polyfluorenes, polyspirofluorenes, polyphenylenevinylenes or organic molecules such as Alq3.
  • Polymers comprising organic active layers can e.g. by spin-coating, knife coating, screen printing, ink jet printing or similar printing techniques applied to the first electrode.
  • Small organic molecules comprising first active layers can be processed by vapor deposition.
  • the second sub-electrodes are associated with the organic photodetectors.
  • a partial electrode of the second partial electrodes with subsequent second active layer and second electrode essentially corresponds to an organic photodiode.
  • the readout of the individual organic photodiodes is preferably carried out in the reverse direction of the photodiodes.
  • the intensity with which the individual organic photodiodes are illuminated determines their diode currents. Touches e.g. an operator the display surface, then the corresponding photodiodes are covered. Through the corresponding photodiodes only a negligible electric current flows.
  • the first active layer and the second active one Layer an according to the structured first electrode structured active layer of organic material.
  • the touch screen according to the invention comprises the active layer of organic material structured in accordance with the structured first electrode
  • the active layer in the area in which it is used to display the image it is possible, on the one hand, for the active layer in the area in which it is used to display the image, to have the most suitable material for the image display and, on the other hand, for the active layer in the region in which it is designed as a photodiode, to use a material which is as suitable as possible for a photodiode.
  • Cheap materials for a photodiode include a blend of a good hole transporter and a good electron acceptor and transporter, such as polythiophene in admixture with excipient derivatives. This embodiment is particularly suitable when the first active layer is e.g. is applied by ink jet printing or vapor deposition through masks structured.
  • the partial electrodes of the first electrode can be operated in particular in the so-called active matrix or passive matrix control.
  • the first electrode is structured in a matrix-like manner in such a case and comprises rows and columns.
  • the individual lines are sequentially illuminated by multiplexing during a specific time period assigned to an image cycle. There is no "stagnant" image, but each line shines only a fraction of the time, but relatively bright.
  • Both the first and second electrodes are striped and perpendicular to each other, some of the pixels, for example, certain columns and / or rows , the second sub-electrodes are the first
  • the touch screen according to the invention comprises the active layer comprising the first active layer and the second active layer, then it is also possible for the active layer to have the property both of displaying an image and of being used as part of a photodiode. Then a time window between two image cycles can be provided. During the image cycle, both the pixels assigned to the first sub-electrodes and to the second sub-electrodes of the first electrode can then be used for imaging. During the time window, the pixels assigned to the second sub-electrodes are then used as photodiodes.
  • each of the sub-electrodes of the first electrode is driven or read out with one or more transistors.
  • all sub-electrodes intended for image display can then be activated.
  • the same transistors are also preferably used to read those sub-electrodes associated with the photodiodes.
  • the second sub-electrodes are not used for image display, it is provided to make the area of the second sub-electrodes smaller than the area of the first sub-electrodes. It is then possible to use fewer pixels for the photodiodes than for image display.
  • the first active layer and the second active layer are only an unstructured active layer of the same organic material.
  • This active layer must be usable both for image display and for a photodiode.
  • Examples of such an organic material are poly-phenylene-vinylenes (PPVs).
  • PSVs poly-phenylene-vinylenes
  • a touchscreen can then be foldable or rollable in particular.
  • the latter comprises a substrate having a planar first side and a planar second side, on the first side of which the first electrode is applied, the organic photodetector a structured third electrode comprising a plurality of third partial electrodes and a planar fourth electrode, between which the second active layer is arranged, wherein the third electrode is applied on the second side of the substrate or on the second electrode.
  • the organic photodetectors are not integrated into the electrodes provided for imaging, but form a separate layer system.
  • the third electrode and the fourth electrode, that is to say the electrodes assigned to the organic photodetectors, are made as transparent as possible, so that the image to be displayed appears through this layer system on the display surface.
  • the electrodes associated with the photodetectors and the electrodes used for imaging have separate leads. It is also possible to make the pixels assigned to the photodetectors larger than the pixels intended for image display.
  • the first active layer that is to say that active layer which is intended for imaging, consists of an inorganic or an organic material.
  • organic LEDs used for image display but in particular also electrochromic or electrophoretic display elements, and inorganic LEDs.
  • electrochromic or electrophoretic display elements can be made flexible or flexible, so it is provided according to a preferred variant of the touch screen according to the invention, the substrate, the first electrode, the second electrode, the third electrode, the fourth electrode, the first active layer, the second active layer and manufacture the display surface from a flexible and / or flexible material.
  • a touchscreen can then be foldable or rollable in particular.
  • Fig.l a touch screen with two electrodes in partial representation
  • Fig. 2 shows one of the two electrodes of the touch screen shown in FIG. 1 in partial Dar- position
  • FIGS. 3 to 5 each show a further touch screen in partial representation.
  • the touch screen 1 comprises a substrate 2 on which a planar structured first electrode 3 is arranged.
  • the structured first electrode 3 comprises, as shown in FIG. 2, a plurality of first partial electrodes 4 arranged in matrix form and second partial electrodes 5 shown hatched in FIG. 2.
  • the second partial electrodes 5 have a smaller area than the first partial electrodes 4 and the number of second partial electrodes 5 are substantially smaller than the number of the first partial electrodes 4.
  • an organic semiconductor layer 6 is applied, which in turn is provided with a planar second electrode 7.
  • the planar second electrode 7 is made of a relatively transparent material and is unstructured.
  • the planar second electrode 7 is in turn provided with a transparent protective layer, which represents the display surface 8 of the touch screen 1.
  • the protective layer may e.g. a polymer layer, an organic or inorganic multi-layer or a glass cap.
  • the organic semiconductor layer 6 is likewise structured in accordance with the planar first electrode 3 and comprises, in those regions which are arranged above the first partial electrodes 4, an organic material suitable for image reproduction, which in the case of the present exemplary embodiment comprises poly-phenylene -Vinyene includes.
  • thin-film transistors are furthermore arranged in the substrate 2, of which in each case one thin-film transistor is connected to one of the first partial electrodes 4 or 5 of the planar structured first electrode 3.
  • the thin-film transistors are in turn electrically connected to electrical leads 9 to a control device 10.
  • the control device 10 and the thin-film transistors connected to the first sub-electrodes 4 are designed to drive the individual first sub-electrodes 4 and the second electrode 7 such that an image to be displayed on the touch screen 1 appears on the display surface 8.
  • the individual first Electrodes 4 associated structured portions of the organic semiconductor layer 6 in conjunction with the corresponding areas of the second electrode 7 thus each represent an organic LED, which in turn are each associated with a pixel of the image displayed on the touch screen 1.
  • the organic semiconductor layer 6 is embodied in the regions which adjoin the second subelectrodes 5 of the first electrode 3 such that in each case a second subelectrode 5 with adjoining organic semiconductor layer 6 and corresponding regions of the second electrode 7 forms an organic photodiode.
  • polythiophene in the mixture with fullerene derivatives is used as the organic material.
  • the thin-film transistors of the substrate 2 associated with the second sub-electrodes 5 of the first electrode 3 in connection with the control device 10 are designed such that they measure the charge on the second sub-electrodes 5 that arises due to incidence of light on the touch screen 1. If an operator, not shown in the figures, for example, touches the display surface 8 with a finger, the corresponding photodiodes are covered, whereby the electric current flow in the corresponding photodiode changes. Because of the electrical signals read out from the thin film transistors associated with the second sub-electrodes 5 and applied to the second sub-electrodes 5, the control device 10 can determine the coordinates of the touch location on the display surface 8 which the operator touches.
  • FIG. 3 shows a further embodiment of a touch screen 30 according to the invention.
  • the touch screen 30 shown in FIG. 3 essentially differs from the touch screen 1 shown in FIGS. 1 and 2 in that an active layer 36 is provided between the two electrodes 3 and 7 an organic material is arranged, which is made both in the areas of the first partial electrodes 4 and in the areas of the second partial electrodes 5 of the same organic material.
  • the organic layer 36 consists of poly-phenylene-vinylenes.
  • the touch screen 30 shown in FIG. 3 can be activated according to the touch screen 1 shown in FIG. 1 or controlled as follows:
  • the control device 10 controls both the thin-film transistors connected to the first sub-electrodes 4 of the first electrode 3 and the second sub-electrodes 5 of the first electrode 3 to be connected to the second electrode 7 and the second sub-electrodes 5 organic active layer 36 display an image on the display surface 8 of the touch screen 30.
  • substantially all of the organic layer 36 is used to display the image during one image cycle.
  • a time window is provided.
  • the thin-film transistors of the second partial electrodes 5 associated with the second partial electrodes 5 of the first electrode 3 and the corresponding regions of the second electrode 7 and the corresponding regions of the organic active layer 36 interposed therebetween are connected as photodiodes.
  • the corresponding thin-film transistors read out the electrical signals at the second sub-electrodes 5, which in turn are evaluated by the control device 10.
  • the control device 10 determines the coordinates of a possible contact location on the display surface 8, which an operator touches.
  • the organic layer 36 is unstructured.
  • the organic layer 36 may also be similar to the organic layer 6 of the 1 illustrated touch screen 1 to be structured.
  • FIG. 4 shows a further exemplary embodiment of a touchscreen 40 in a partial representation.
  • the touch screen 40 comprises a substrate 42 on which a planar structured, a plurality of partial electrodes comprising the first electrode 43 is arranged. Each of the sub-electrodes is associated with a pixel of an image to be displayed with the touch screen 40.
  • the structured first electrode 43 is provided with an active layer 46, which in turn is provided with an at least semitransparent second electrode 47.
  • the second electrode 47 is provided with an at least semitransparent insulating layer 48.
  • a structured planar third electrode 49 comprising a plurality of partial electrodes is arranged on the insulation layer 48.
  • the structured third electrode 49 is at least semitransparent and provided with a further active layer 50, which in the case of the present exemplary embodiment is a polythiophene mixed with fuller-derivative-containing organic semiconductor layer.
  • the active layer 50 is in turn provided with a planar structured, at least semitransparent fourth electrode 51 comprising a plurality of partial electrodes, which in turn is coated with a transparent protective layer, which is the display surface 52 of the touch screen 40.
  • the third electrode 49 and the fourth electrode 51 are structured in a strip-like manner perpendicular to one another.
  • a control device controls thin-film transistors, not shown in FIG. 4, arranged in the substrate 42 such that it consists of the first electrode 43, the second electrode 47 and the active layer 46 first layer system generates an image displayed on the display surface 52.
  • the active one Layer 46 comprises an organic semiconductor material in the case of the present embodiment. The first layer system is thus operated in the active-matrix drive.
  • the second layer system comprising the third and fourth electrodes 49 and 51, as well as the active layer 50, is essentially a photodetector having a plurality of organic photodiodes arranged in matrix form, which are connected to the control device and serve as touch-sensitive elements.
  • the second layer system is operated in the case of the present embodiment in the passive matrix drive.
  • the second layer system in conjunction with the control device is designed in such a way that the charge distribution between the partial electrodes of the third electrode 49 and the partial electrodes of the fourth electrode 51 resulting from the incidence of light on the touch screen 40 is measured. If an operating person, not shown in the figures, for example touches the display surface 52 with a finger, the corresponding photodiodes are covered, whereby the electric current flow in the corresponding photodiodes changes. The electrical signals applied between the third electrode 49 and the fourth electrode 51 are read out with the control device. Based on these electrical signals, the controller then determines the coordinates of the touch location on the display surface 52 that the operator touches.
  • FIG. 5 shows a further embodiment of a touch screen 53 in partial representation.
  • the touch screen 53 comprises a substrate 54, on one side of which a planar structured first electrode 55 comprising a plurality of partial electrodes is arranged.
  • the structured first electrode 55 is provided with an active layer 56, which in turn is provided with a second electrode 57.
  • the structured second electrode 57 is coated with a protective layer 58.
  • the second side of the substrate 54 is coated with a planar structured, comprising a plurality of partial electrodes third electrode 59, which in turn is provided with an active layer 60.
  • a planar fourth electrode 61 Arranged on the active layer 60 is a planar fourth electrode 61, which in turn is coated with an at least semitransparent layer representing the display surface 62 of the touch screen 53.
  • a thin-film transistor is connected to a respective partial electrode of the structured first electrode 55 and to a partial electrode of the structured third electrode 59.
  • the thin-film transistors of the substrate 54 are in turn connected to an electrical line 63 with a control device 64.
  • the active layer 56 composed of the substrate 54, the first electrode 55, the second electrode 57 and the intermediate therebetween constitutes a display device which is controlled by the control device 64 such that a displayable surface 62 is displayed Image is displayed.
  • the planar third electrode 59, the planar fourth electrode 61 and the intermediate active layer 60 which in the case of the present exemplary embodiment is an organic semiconductor layer composed of a mixture of a polythiophene and fullerene derivatives, are controlled by the control device 64 in such a way that that this layer system represents a touch-sensitive element.
  • the laminar third electrode 59, the planar fourth electrode 61 and the layered active layer 60 having an intermediate layer system, and the substrate 55 are made of at least one semitransparent material. so that the image to be displayed can be seen through this layer system.
  • the touch screen according to the invention can also be executed with a passive matrix drive.

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)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un écran tactile (1, 30, 40, 53) présentant une surface d'affichage (8, 52, 62), une première électrode (3, 43, 55) plane structurée, qui comprend plusieurs premières électrodes partielles (4), ainsi qu'au moins une première couche active (6, 36, 46, 56) disposée entre la première électrode (3, 43, 55) et la seconde électrode (7, 47, 57). Les premières électrodes partielles (4) de la première électrode (3, 43, 55) sont régulées de sorte à coopérer avec la second électrode (7, 47, 57) et la première couche active (6, 36, 56) disposée entre elles, ce qui permet l'affichage d'une image sur la surface de visualisation (8, 52, 62). L'écran tactile (1, 30, 40, 53) présente en outre des photodétecteurs organiques intégrés dans ledit écran tactile (1, 30, 40, 50), avec au moins une seconde couche active (6, 36, 50, 60) à base de matériau organique. Un signal alloué au point de contact de la surface de visualisation (8, 52, 62) se trouve au niveau des photodétecteurs organiques.
EP06764303A 2005-08-11 2006-08-07 Ecran tactile Withdrawn EP1913461A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005038123 2005-08-11
PCT/EP2006/065102 WO2007017485A2 (fr) 2005-08-11 2006-08-07 Ecran tactile

Publications (1)

Publication Number Publication Date
EP1913461A2 true EP1913461A2 (fr) 2008-04-23

Family

ID=37192459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06764303A Withdrawn EP1913461A2 (fr) 2005-08-11 2006-08-07 Ecran tactile

Country Status (2)

Country Link
EP (1) EP1913461A2 (fr)
WO (1) WO2007017485A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008039345A1 (de) 2008-08-22 2010-02-25 Siemens Aktiengesellschaft Eingabeeinrichtung zum Eingeben zumindest eines Befehls durch zumindest eine Betätigung eines Nutzers und Verfahren zum Herstellen einer solchen Eingabeeinrichtung
DE102010053301A1 (de) * 2010-12-02 2012-06-06 Volkswagen Aktiengesellschaft Bedienvorrichtung mit transparenten Haptikmitteln und Fahrzeug mit einer solchen Bedienvorrichtung
DE102013006069A1 (de) 2013-04-08 2014-10-09 Audi Ag Verfahren zum Herstellen eines Bedienelements und Bedienelement
DE102014117317A1 (de) * 2014-11-26 2016-06-02 Osram Oled Gmbh Display-Vorrichtung, Verfahren zum Herstellen einer Display-Vorrichtung und Verfahren zum Betreiben einer Display-Vorrichtung

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US4655552A (en) * 1984-03-17 1987-04-07 Citizen Watch Co., Ltd. Flat panel display device having on-screen data input function
US5907375A (en) * 1996-03-01 1999-05-25 Fuji Xerox Co., Ltd. Input-output unit
US6589650B1 (en) * 2000-08-07 2003-07-08 3M Innovative Properties Company Microscope cover slip materials
JP4055722B2 (ja) * 2003-11-10 2008-03-05 ソニー株式会社 アクティブマトリクス型有機ｅｌ表示装置

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Also Published As

Publication number Publication date
WO2007017485A2 (fr) 2007-02-15
WO2007017485A3 (fr) 2008-03-27

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