WO2003003291A1 - Data carrier with an optical memory display unit - Google Patents

Data carrier with an optical memory display unit Download PDF

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Publication number
WO2003003291A1
WO2003003291A1 PCT/DE2002/002125 DE0202125W WO03003291A1 WO 2003003291 A1 WO2003003291 A1 WO 2003003291A1 DE 0202125 W DE0202125 W DE 0202125W WO 03003291 A1 WO03003291 A1 WO 03003291A1
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WO
WIPO (PCT)
Prior art keywords
data carrier
display unit
liquid crystal
unit
display
Prior art date
Application number
PCT/DE2002/002125
Other languages
German (de)
French (fr)
Inventor
Boris Mayerhofer
Jochen Müller
Manfred Roth
Original Assignee
Infineon Technologies 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 Infineon Technologies Ag filed Critical Infineon Technologies Ag
Publication of WO2003003291A1 publication Critical patent/WO2003003291A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07701—Constructional details, e.g. mounting of circuits in the carrier the record carrier comprising an interface suitable for human interaction
    • G06K19/07703—Constructional details, e.g. mounting of circuits in the carrier the record carrier comprising an interface suitable for human interaction the interface being visual
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory

Definitions

  • the invention relates to a data carrier with a data processing unit and a display unit connected to it and having an optical storage capacity.
  • Display units which have an optical storage capacity have several advantages over conventional liquid crystal displays.
  • One of the advantages is that only those display areas that have really changed have to be updated, since the other areas retain the state after the last change even without activation.
  • a technology used for such display units are so-called ferroelectric liquid crystals. After the ferroelectric liquid crystals have changed their orientation due to the application of an electrical field, they maintain their state until a further inverted field is applied.
  • Further advantages of display units based on ferroelectric liquid crystals are a higher viewing angle and an extremely short switching time compared to display units with previous nematic liquid crystals.
  • the optical storage capability can be a disadvantage, since the display is permanently visible and security-relevant data, for example the monetary value on a cash card, can thus be recognized by unauthorized persons.
  • This object is achieved according to the invention by a data carrier of the type mentioned at the outset, which is characterized in that an additional cover unit is provided which can be switched through a control device in a transparent and opaque manner.
  • the cover unit consists of a normal or a bistable liquid crystal cell, which can be switched from opaque to transparent or vice versa by a voltage pulse.
  • the cover unit is controlled in a favorable manner by a piezo button, which serves as a control device. When the piezo button is pressed, the display switches to the transparent state, and when the piezo button is pressed again, the display becomes opaque again.
  • the invention is explained in more detail below on the basis of an exemplary embodiment.
  • the figure shows a data carrier according to the invention in a schematic representation.
  • a data carrier 1 is shown in the form of a chip card.
  • the chip card has a data processing unit 2 and a display unit 3 connected to it, which is designed as a ferroelectric liquid crystal display.
  • a cover unit 4 is arranged above the display unit 3. This completely covers the display unit 3 in the exemplary embodiment shown. At this point, however, it is also conceivable that the covering unit 4 only covers those areas which are to be protected from constant visibility.
  • the cover unit 4 is therefore between the display unit 3 and an observer.
  • the cover unit is connected to a control device 5. In the exemplary embodiment, this is designed as a piezo switch 5.
  • a button 5 is particularly easy to implement in that a piezo film is laminated into the card. This film releases a voltage pulse when pressed by a finger, which is now used to switch the cover unit 4 to be transparent or opaque.
  • the display unit 3 is darkened by the cover unit 4.
  • This state is achieved in that a further liquid crystal cell 4, which is filled over the entire area with a conventional liquid crystal, is glued on via the actual alphanumeric ferroelectric liquid crystal display 3.
  • the conventional liquid crystals are monostable and dark.
  • This cover unit 4 is supplied directly via the voltage of the button, so that the crystal can be switched inside by changing the voltage by pressing button 5.
  • the voltage-free, darkened state of the covering unit 4 accordingly changes from dark to light due to this voltage change, which corresponds to a transparent structure of the liquid crystal, and provides a view of the described display unit 3.
  • a bistable liquid crystal display was provided as the covering unit 4.
  • the invention is not so limited.
  • a conventional liquid crystal cell could also be used and the control device could be designed in such a way that the voltage then required to change the polarization and thus light up the liquid crystal stall is generated.
  • the switchover from dark to light and vice versa could be realized by pressing and holding a button, the covering unit becoming dark again after the button is released.

Abstract

The invention relates to a data carrier with a data processing unit (2) and an optical memory display unit (3) linked therewith that consists, in a preferred embodiment, of a ferroelectric liquid crystal display. The inventive data carrier is characterized by comprising an additional cover unit (4), preferably a conventional monostable liquid crystal cell which at least partially covers the display unit (3). The data carrier is further provided with a control device (5) that consists, in a preferred embodiment, of a piezosensor and that is adapted to switch the cover unit (4) to a transparent or non-transparent state.

Description

Beschreibung description
DATENTRÄGER MIT EINER OPTISCHEN SPEICHERFÄHIGKEIT BESITZENDEN ANZEIGEEINHEITDATA CARRIER WITH A DISPLAY UNIT OPTICAL STORAGE CAPABILITY
Die Erfindung betrifft einen Datenträger mit einer Datenverarbeitungseinheit und einer damit verbundenen eine optische Speicherfähigkeit besitzende Anzeigeeinheit .The invention relates to a data carrier with a data processing unit and a display unit connected to it and having an optical storage capacity.
Anzeigeeinheiten, die eine optische Speicherfähigkeit besit- zen, weisen gegenüber herkömmlichen Flüssigkristallanzeigen mehrere Vorteile auf. Einer der Vorteile ist, daß nur noch diejenigen Anzeigenbereiche aktualisiert werden müssen, die sich wirklich geändert haben, da die übrigen Bereiche den Zustand nach der letzten Änderung auch ohne Ansteuerung beibe- halten. Eine verwendete Technologie für solche Anzeigeeinheiten sind sogenannte ferroelektrische Flüssigkristalle. Nachdem die ferroelektrischen Flüssigkristalle durch Anlegen eines elektrischen Feldes ihre Orientierung geändert haben, behalten sie ihren Zustand bis zum Anlegen eines weiteren in- vertierten Feldes bei. Weitere Vorteile von auf ferroelektrischen Flüssigkristalle basierenden Anzeigeeinheiten sind ein höherer Betrachtungswinkel und eine extrem kurze Schaltzeit verglichen mit Anzeigeeinheiten mit bisherigen nematischen Flüssigkristallen.Display units which have an optical storage capacity have several advantages over conventional liquid crystal displays. One of the advantages is that only those display areas that have really changed have to be updated, since the other areas retain the state after the last change even without activation. A technology used for such display units are so-called ferroelectric liquid crystals. After the ferroelectric liquid crystals have changed their orientation due to the application of an electrical field, they maintain their state until a further inverted field is applied. Further advantages of display units based on ferroelectric liquid crystals are a higher viewing angle and an extremely short switching time compared to display units with previous nematic liquid crystals.
Bei der Verwendung solcher Anzeigeeinheiten in Verbindung mit einem Datenträger, beispielsweise einer Chipkarte, kann die optische Speicherfähigkeit von Nachteil sein, da die Anzeige permanent sichtbar ist und sicherheitsrelevante Daten, bei- spielsweise der Geldwert auf einer Geldkarte, somit für unberechtigte Personen erkennbar sind.When using such display units in connection with a data carrier, for example a chip card, the optical storage capability can be a disadvantage, since the display is permanently visible and security-relevant data, for example the monetary value on a cash card, can thus be recognized by unauthorized persons.
Aufgabe der Erfindung ist es daher, einen Datenträger mit einer eine optische Speicherfähigkeit besitzenden Anzeigeein- heit derart weiterzubilden, daß ein auf der Αnzeigeeinheit dargestellter Inhalt verborgen werden kann. Diese Aufgabe wird erfindungsgemäß durch einen Datenträger der eingangs genannten Art gelöst, der dadurch gekennzeichnet ist, daß eine zusätzliche Abdeckeinheit vorgesehen ist, die durch eine Ansteuervorrichtung durchsichtig und undurchsich- tig schaltbar ist.It is therefore an object of the invention to develop a data carrier with a display unit having optical storage capacity in such a way that content displayed on the display unit can be hidden. This object is achieved according to the invention by a data carrier of the type mentioned at the outset, which is characterized in that an additional cover unit is provided which can be switched through a control device in a transparent and opaque manner.
Der Vorteil einer solchen Ausgestaltung eines Datenträgers liegt darin, daß die Vorteile von Anzeigeeinheiten, die eine optische Speicherfähigkeit besitzen, mit der Möglichkeit, den gespeicherten Inhalt zu verbergen, kombiniert werden können.The advantage of such a design of a data carrier is that the advantages of display units which have an optical storage capability can be combined with the possibility of concealing the stored content.
In einer vorteilhaften Ausgestaltung besteht die Abdeckeinheit aus einer normalen oder einer bistabilen Flüssigkristallzelle, die durch einen Spannungsimpuls von undurchsich- tig auf durchsichtig bzw. umgekehrt geschaltet werden kann. Die Ansteuerung der Abdeckeinheit erfolgt in einer günstigen Weise durch einen Piezotaster, der als Ansteuervorrichtung dient. Bei Betätigung des Piezotasters erfolgt eine Umschaltung in den durchsichtigen Zustand, bei nochmaliger Betäti- gung des Piezzotasters wird die Anzeige wieder undurchsichtig.In an advantageous embodiment, the cover unit consists of a normal or a bistable liquid crystal cell, which can be switched from opaque to transparent or vice versa by a voltage pulse. The cover unit is controlled in a favorable manner by a piezo button, which serves as a control device. When the piezo button is pressed, the display switches to the transparent state, and when the piezo button is pressed again, the display becomes opaque again.
Die Erfindung wird nachfolgend anhand eines Ausführungsbei- spieles näher erläutert . Die Figur zeigt einen erfindungsge- mäßen Datenträger in einer schematischen Darstellung.The invention is explained in more detail below on the basis of an exemplary embodiment. The figure shows a data carrier according to the invention in a schematic representation.
In der Figur ist ein Datenträger 1 in Form einer Chipkarte dargestellt. Die Chipkarte besitzt eine Datenverarbeitungs- einheit 2 und eine damit verbundene Anzeigeeinheit 3, die als ferroelektrische Flüssigkristallanzeige ausgebildet ist.In the figure, a data carrier 1 is shown in the form of a chip card. The chip card has a data processing unit 2 and a display unit 3 connected to it, which is designed as a ferroelectric liquid crystal display.
Oberhalb der Anzeigeeinheit 3 ist eine Abdeckeinheit 4 angeordnet. Diese überdeckt die Anzeigeeinheit 3 im gezeigten Ausführungsbeispiel vollständig. An dieser Stelle ist aber auch denkbar, daß die Abdeckeinheit 4 nur diejenigen Bereiche überdeckt, die vor einer ständigen Sichtbarkeit geschützt werden sollen. Die Abdeckeinheit 4 liegt also zwischen der Anzeigeeinheit 3 und einem Betrachter. Die Abdeckeinheit ist mit einer Ansteuervorrichtung 5 verbunden. Diese ist im Ausführungsbeispiel als Piezotaster 5 ausgeführt . Ein solcher Taster 5 ist besonders einfach dadurch zu realisieren, daß eine Piezo-Folie in die Karte einlaminiert ist. Diese Folie gibt bei Druck durch einen Finger einen Spannungsimpuls ab, der nun dazu benutzt wird, die Abdek- keinheit 4 durchsichtig oder undurchsichtig zu schalten.A cover unit 4 is arranged above the display unit 3. This completely covers the display unit 3 in the exemplary embodiment shown. At this point, however, it is also conceivable that the covering unit 4 only covers those areas which are to be protected from constant visibility. The cover unit 4 is therefore between the display unit 3 and an observer. The cover unit is connected to a control device 5. In the exemplary embodiment, this is designed as a piezo switch 5. Such a button 5 is particularly easy to implement in that a piezo film is laminated into the card. This film releases a voltage pulse when pressed by a finger, which is now used to switch the cover unit 4 to be transparent or opaque.
Im Ausgangszustand ist die Anzeigeeinheit 3 durch die Abdeckeinheit 4 verdunkelt. Dieser Zustand wird erreicht, indem über die eigentliche alphanumerische ferroelektrische Flüssigkristallanzeige 3 eine weitere Flüssigkristallzelle 4, die ganzflächig mit einem herkömmlichen Flüssigkristall gefüllt ist, aufgeklebt ist. Die herkömmlichen Flüssigkristalle sind monostabil und dunkel .In the initial state, the display unit 3 is darkened by the cover unit 4. This state is achieved in that a further liquid crystal cell 4, which is filled over the entire area with a conventional liquid crystal, is glued on via the actual alphanumeric ferroelectric liquid crystal display 3. The conventional liquid crystals are monostable and dark.
Diese Abdeckeinheit 4 wird direkt über die Spannung des Tasters versorgt, so daß der Kristall in dessen Inneren durch eine Spannungsänderung durch Drücken der Taste 5 geschaltet werden kann. Der spannungslose verdunkelte Zustand der Abdek- keinheit 4 ändert sich demnach durch diese Spannungsänderung von dunkel auf hell, was einer durchsichtigen Struktur des Flüssigkristalls entspricht, und gibt die Sicht auf die be- schriebene Anzeigeeinheit 3 frei.This cover unit 4 is supplied directly via the voltage of the button, so that the crystal can be switched inside by changing the voltage by pressing button 5. The voltage-free, darkened state of the covering unit 4 accordingly changes from dark to light due to this voltage change, which corresponds to a transparent structure of the liquid crystal, and provides a view of the described display unit 3.
Bei nochmaliger Betätigung der Taste geht die Spannung an der Abdeckeinheit 4 auf Null und die Abdeckeinheit 4 verdunkelt die Anzeigeeinheit 3 wieder.When the button is pressed again, the voltage on the cover unit 4 goes to zero and the cover unit 4 darkens the display unit 3 again.
Im Rahmen dieses Ausführungsbeispiels wurde eine bistabile Flüssigkristallanzeige als Abdeckeinheit 4 vorgesehen. Die Erfindung ist jedoch nicht darauf beschränkt. Statt dessen könnte beispielsweise auch eine herkömmliche Flüssigkristall- zelle verwendet und die Ansteuervorrichtung so ausgestaltet werden, daß eine dann erforderlich andauernde Spannung zur Polarisationsänderung und damit Hellschalten der Flüssigkri- stalle erzeugt wird. Entsprechend könnte die Umschaltung von Dunkel auf Hell und umgekehrt durch das Betätigen und Halten einer Taste realisiert werden, wobei nach Loslassen der Taste die Abdeckeinheit wieder dunkel wird. In the context of this exemplary embodiment, a bistable liquid crystal display was provided as the covering unit 4. However, the invention is not so limited. Instead of this, for example, a conventional liquid crystal cell could also be used and the control device could be designed in such a way that the voltage then required to change the polarization and thus light up the liquid crystal stall is generated. Correspondingly, the switchover from dark to light and vice versa could be realized by pressing and holding a button, the covering unit becoming dark again after the button is released.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Datenträger1 disk
2 Datenverarbeitungseinheit2 data processing unit
3 Anzeigeeinheit3 display unit
4 Abdeckeinheit4 cover unit
5 Ansteuervorrichtung 5 control device

Claims

Patentansprüche claims
1. Datenträger mit einer Datenverarbeitungseinheit (2) und einer damit verbundenen, eine optische Speicherfähigkeit besitzenden Anzeigeeinheit (3) , g e k e n n z e i c h n e t d u r c h eine die Anzeigeeinheit zumindest teilweise überdeckende Abdeckeinheit (4) , die durch eine Ansteuervorrichtung (5) durchsichtig und undurchsichtig schaltbar ist.1. A data carrier with a data processing unit (2) and a display unit (3) connected to it and having an optical storage capacity, a cover unit (4) at least partially covering the display unit, which can be switched transparently and opaque by a control device (5).
2. Datenträger nach Anspruch 1 , d a d u r c h g e k e n n z e i c h n e t, daß die Ansteuervorrichtung (5) durch einen Piezotaster gebildet ist.2. Data carrier according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the control device (5) is formed by a piezo button.
3. Datenträger nach Anspruch 1 oder 2 , d a d u r c h g e k e n n z e i c h n e t, daß die Anzeigeeinheit (3) eine bistabile Flüssigkristallanzeige und die Abdeckeinheit (4) eine monostabile Flüssigkristall- Zelle ist.3. Data carrier according to claim 1 or 2, so that the display unit (3) is a bistable liquid crystal display and the cover unit (4) is a monostable liquid crystal cell.
4. Datenträger nach Anspruch 3 , dadurch gekennzeichnet, daß die bistabile Flüs- sigkristallanzeige eine ferroelektrische Flüssigkristallanzeige ist.4. Data carrier according to claim 3, characterized in that the bistable liquid crystal display is a ferroelectric liquid crystal display.
5. Datenträger nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, daß die Abdeckvorrichtung (4) im nicht angesteuerten Zustand undurchsichtig ist . 5. A data carrier according to one of claims 1 to 4, that the cover device (4) is opaque in the non-activated state.
PCT/DE2002/002125 2001-06-27 2002-06-11 Data carrier with an optical memory display unit WO2003003291A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001131010 DE10131010B4 (en) 2001-06-27 2001-06-27 disk
DE10131010.2 2001-06-27

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WO2003003291A1 true WO2003003291A1 (en) 2003-01-09

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WO (1) WO2003003291A1 (en)

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WO2008083921A1 (en) * 2007-01-10 2008-07-17 Bundesdruckerei Gmbh Document with an optical transmitter
WO2010133635A1 (en) * 2009-05-20 2010-11-25 Giesecke & Devrient Gmbh Arrangement for displaying information, method for displaying information and electronic terminal device
EP2738012A1 (en) * 2012-11-29 2014-06-04 Gemalto SA Secure document and method for automated authentication of a secure document

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PL1891499T3 (en) * 2005-06-03 2012-05-31 Electrolux Ab Household appliance having concealable user interface
DE202006016358U1 (en) * 2006-10-14 2008-02-21 Nanocrypt Ag Device for authentication
DE102008006532A1 (en) * 2008-01-29 2009-07-30 Giesecke & Devrient Gmbh Displaying a payload on a display element

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US4667087A (en) * 1986-03-31 1987-05-19 Max A. Quintana Secure credit card
EP0291259A1 (en) * 1987-05-09 1988-11-17 Sel Semiconductor Energy Laboratory Co., Ltd. Ferroelectric liquid crystal data storage card
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GB2333494A (en) * 1998-01-27 1999-07-28 Ibm Smart card for electronic cash transactions having ferroelectric LCD
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WO2008083921A1 (en) * 2007-01-10 2008-07-17 Bundesdruckerei Gmbh Document with an optical transmitter
WO2010133635A1 (en) * 2009-05-20 2010-11-25 Giesecke & Devrient Gmbh Arrangement for displaying information, method for displaying information and electronic terminal device
KR101373989B1 (en) * 2009-05-20 2014-03-12 기제케 운트 데브리엔트 게엠베하 Arrangement for displaying information, method for displaying information and electronic terminal device
EP2738012A1 (en) * 2012-11-29 2014-06-04 Gemalto SA Secure document and method for automated authentication of a secure document

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DE10131010A1 (en) 2003-01-23
DE10131010B4 (en) 2004-03-04

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