EP1346312A2 - Display with an electrically conducting layer - Google Patents

Display with an electrically conducting layer

Info

Publication number
EP1346312A2
EP1346312A2 EP01991648A EP01991648A EP1346312A2 EP 1346312 A2 EP1346312 A2 EP 1346312A2 EP 01991648 A EP01991648 A EP 01991648A EP 01991648 A EP01991648 A EP 01991648A EP 1346312 A2 EP1346312 A2 EP 1346312A2
Authority
EP
European Patent Office
Prior art keywords
display
liquid crystal
electrically conductive
conductive layer
display according
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Withdrawn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
EP01991648A
Other languages
German (de)
French (fr)
Inventor
Peter Brandt
Thomas Brohm
Gerhard Wesner
Michael Zimmermann
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.)
Continental Automotive GmbH
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 EP1346312A2 publication Critical patent/EP1346312A2/en
Withdrawn legal-status Critical Current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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0444—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a display with an electrically conductive layer.
  • Displays with an electrically conductive layer are known in the prior art and are used to design the display as a so-called “touch screen” or to heat it, for example in the case of liquid crystal displays. B. may occur when used in motor vehicles, to be able to switch quickly and thus to prevent a sluggish display.
  • a “touch screen” is known in the prior art and is used to be able to select menus, submenus, values or icons displayed on a screen by touching the respective display with a finger or other input means.
  • an analog resistive touch screen is a hardened glass pane arranged with an electrically conductive coating having a uniform electrical resistance. a sheet of polyester prior to display tightly stretched over this glass top, and separated by small transparent insulating dots from it. the variable film has' a hard, durable coating on the A conductive and highly transparent indium-tin-oxide coating on the outside and inside. Even with a light touch, the conductive coating establishes an electrical connection with the coating on the glass.
  • An integrated controller applies a voltage gradient to the conductive coating
  • the voltages at the contact point represent the touched position using analog values.
  • the controller digitizes these voltages and sends them to a processing device to determine the touch positions.
  • a capacitive touch screen consists of a clear pane that has been coated with a resistive capacitive and an insulating material.
  • An electromagnetic field is generated over the disc. When a conductive object, such as a finger or metal pen, touches and grounds the screen, the electromagnetic field is changed. The location of the contact can be deduced from the change in the electromagnetic field.
  • Displays and the driver circuits controlling them are operated at high frequencies. This can lead to undesired electromagnetic interference in the area surrounding the displays.
  • a display in an instrument cluster of a motor vehicle for. B. the radio reception and / or cell phone reception in the motor vehicle.
  • the object of the invention is therefore to provide a display with an electrically conductive layer which causes as few electromagnetic disturbances as possible and does not pass electromagnetic disturbances caused by the control electronics and which is simple and inexpensive.
  • this object is achieved in that the electrically conductive layer is connected to a shield potential in terms of radio frequency. This ensures that the electrically conductive layer is at the shielding potential in terms of high frequency and thus prevents the passage of high frequencies.
  • the high-frequency connection can be made, for example, with capacitors which are arranged between the electrically conductive layer and the shield potential, a connection of the capacitor being connected to the electrically conductive layer and a connection being connected to the shield potential.
  • the shielding potential can be realized, for example, by a metal housing or by a metallized housing, the housing being closed by the display. Depending on the required shielding effect, it may be sufficient to connect the liquid crystal display to a ground potential by radio frequency.
  • the electrically conductive layer can be constructed from indium tin oxide (ITO), which covers the display area.
  • ITO indium tin oxide
  • the electrically conductive layer can be configured as a heating device through which a heating current flows. It is also possible to implement the heating device by means of current-conducting tracks which are arranged individually or in a meandering shape. If these tracks run between the electrodes of the liquid crystal cells and consist of indium tin oxide, they can be produced in one operation with the electrodes of the liquid crystal cells.
  • the electrically conductive layer can be designed as part of a touch screen.
  • the display can be configured, for example, as a liquid crystal display, OLED display or as a monitor.
  • the display is designed as a liquid crystal display and an electrically conductive layer of a touch screen is arranged in front of it, the electrically conductive layer can also be used at the same time as heating the liquid crystal display.
  • FIG. 1 shows a partial section of a liquid crystal cell with a surface-mounted heater and the connection to a screen potential
  • Figure 2 is an exploded view of a front and back wall of a liquid crystal cell
  • FIG. 3 shows the section through a liquid crystal cell and a screen housing
  • Figure 4 shows a touch screen with a monitor in an exploded view.
  • a liquid crystal cell 1 has a front wall 2a and a rear wall 2b.
  • flat heating layers 3a, 3b are applied, each of which is separated from the front and rear electrodes 5a, 5b by insulation 4a, 4b.
  • the front and rear electrodes 5a, 5b are finally separated from a liquid crystal substance 7 by insulation 6a, 6b.
  • the front and rear heating layers 3a, 3b are connected to a ground potential M via contact terminals 8a, 8b, electrical conductors 9a, 9b, capacitors 10a, 10b.
  • High-frequency interference striking the heating layers 3a, 3b can be conducted to the ground potential M via the contact terminals 8a, 8b, electrical conductors 9a, 9b, capacitors 10a, 10b.
  • An adhesive bond 11 connects the front wall 2a to the rear wall 2b and prevents the liquid crystal substance 7 from escaping.
  • a front wall 12a and a rear wall 12b of another liquid crystal cell can be seen in FIG.
  • Electrodes 13a are arranged on the front wall 12a and electrodes 13b are arranged on the rear wall 12b. Between the electrodes 13a Heating wires 14a are arranged at the front wall 12a, which are connected to one another via contact pins 15 and connections 16a arranged on the rear wall 12b and are thus connected in series. Between the electrodes 13b of the rear wall, heating wires 14b are arranged, which are also connected via contact pins (not shown) and connections 16b arranged on the front wall 12a and are thus connected in series. The heating wires 14a, 14b are connected to a shield potential (not shown) via connections 17a, 17b.
  • the arrangement of the heating wires 16a, 16b at right angles to one another results in an overall lattice-shaped arrangement of the heating wires 16a, 16b with respect to one another, so that in the case of a high-frequency connection to a shielding potential, high frequencies are prevented by a display which the components shown in FIG. 2 prevent having.
  • FIG 3 shows a liquid crystal cell 1 with a heater, not shown, which can be designed like the heaters of the liquid crystal cells shown in Figure 1 or 2.
  • the heating device is electrically connected to a shield housing 20 via contact terminals 8a, 8b and capacitors 10a, 10b.
  • the shield housing 20 can be made of metal or coated with a metal.
  • the interior of the shield housing 20 is largely separated from the surroundings of the shield housing in terms of radio frequency. No external interference can penetrate into the interior. Likewise, disturbances caused by a control circuit 21 cannot escape to the outside and thus do not disturb devices in the vicinity of the liquid crystal cell 1.
  • the 4 shows a monitor 21, a glass layer 22, transparent metal films 23, 24, an electron grid 25 and a glass layer 26.
  • the glass layer 22 is vapor-coated with the metal films 23, 24.
  • the electron grid 25 is evaporated on the metal film 23 in the edge region.
  • the glass layer 26 is applied to protect the touch screen.
  • the electron grid 25 will have a low alternating voltage at all four corners. created. If you now touch the screen surface with a finger, the potential of the finger attracts a tiny amount of charge from each corner point. Since the current flow from four corners of the touch screen is proportional to the distance between the corner and the point of contact, the exact point at which the touch screen was touched can be calculated, and thus the menu, submenu, value or icon displayed for this area of the monitor to be selected.
  • the metal film 24 is connected to the ground potential M via a capacitor 10. High-frequency electromagnetic radiation from the monitor or another display instead of the monitor 21 is thus shielded.
  • the metal film 24 can be used simultaneously for heating the liquid crystal display.

Abstract

The invention relates to a display (1), with an electrically conducting layer (3a, 3b, 14a, 14b), whereby the electrically conducting layer (3a, 3b, 14a, 14b) is connected to a screen potential (M, 20) for high frequencies.

Description

Beschreibungdescription
Anzeige mit einer elektrisch leitenden SchichtDisplay with an electrically conductive layer
Die Erfindung betrifft eine Anzeige mit einer elektrisch leitenden Schicht. Anzeigen mit einer elektrisch leitenden Schicht sind im Stand der Technik bekannt und werden verwendet, um die Anzeige als sogenannten „touch screen" auszugestalten oder beispielsweise bei Flüssigkristallanzeigen diese zu beheizen. Heizvorrichtungen werden bei Flüssigkristallanzeigen verwendet, um auch bei niedrigen Temperaturen, wie sie z. B. bei Verwendung in Kraftf hrzeugen vorkommen können, schnell schalten zu können und so eine träge Anzeige zu verhindern.The invention relates to a display with an electrically conductive layer. Displays with an electrically conductive layer are known in the prior art and are used to design the display as a so-called “touch screen” or to heat it, for example in the case of liquid crystal displays. B. may occur when used in motor vehicles, to be able to switch quickly and thus to prevent a sluggish display.
Ein „touch screen" ist im Stand der Technik bekannt und wird verwendet, um auf einem Bildschirm dargestellte Menüs, Untermenüs, Werte oder Icons durch ein Berühren der jeweiligen Darstellung mit einem Finger oder einem sonstigen Eingabemittel auswählen zu können. Bei einem analog resistiven touch screen ist vor der Anzeige eine gehärtete Glasscheibe angeordnet mit einer elektrisch leitfähigen Beschichtung mit gleichmäßigem elektrischen Widerstand. Eine Folie aus Polyester ist straff über diese Glasoberseite gespannt und durch kleine, transparente Isolationspunkte von ihr getrennt. Die variable Folie hat' eine harte, strapazierfähige Beschichtung auf der Außenseite und innen eine leitfähige und hochtransparente Indium-Zinn-Oxydbeschichtung . Schon bei leichter Berührung stellt die leitfähige Beschichtung eine elektrische Verbindung mit der Beschichtung auf dem Glas her. Durch einen integrierten Controller wird an der leitfähigen Beschichtung ein Spannungsgradient angelegt. Die Spannungen am Kontakt- punkt bilden die berührte Position mit Hilfe von Analogwerten ab. Diese Spannungen digitalisiert der Controller und sendet sie zur Bestimmung der Berührungspositionen an eine Verarbeitungsvorrichtung . Ein kapazitiver touch screen besteht aus einer Klarscheibe, die mit einem resistiv kapazitivem und einem isolierenden Material beschichtet wurde. Über der Scheibe wird ein elektromagnetisches Feld erzeugt. Wenn ein leitender Gegenstand, zum Beispiel ein Finger oder Metallstift, den Bildschirm berührt und erdet, wird das elektromagnetische Feld verändert. Aus der Änderung des elektromagnetischen Feldes kann auf den Ort der Berührung geschlossen werden.A “touch screen” is known in the prior art and is used to be able to select menus, submenus, values or icons displayed on a screen by touching the respective display with a finger or other input means. With an analog resistive touch screen is a hardened glass pane arranged with an electrically conductive coating having a uniform electrical resistance. a sheet of polyester prior to display tightly stretched over this glass top, and separated by small transparent insulating dots from it. the variable film has' a hard, durable coating on the A conductive and highly transparent indium-tin-oxide coating on the outside and inside. Even with a light touch, the conductive coating establishes an electrical connection with the coating on the glass. An integrated controller applies a voltage gradient to the conductive coating The voltages at the contact point represent the touched position using analog values. The controller digitizes these voltages and sends them to a processing device to determine the touch positions. A capacitive touch screen consists of a clear pane that has been coated with a resistive capacitive and an insulating material. An electromagnetic field is generated over the disc. When a conductive object, such as a finger or metal pen, touches and grounds the screen, the electromagnetic field is changed. The location of the contact can be deduced from the change in the electromagnetic field.
Anzeigen und die sie steuernden Treiberschaltungen werden mit hohen Frequenzen betrieben. So kann es zu unerwünschten elektromagnetischen Störungen in der Umgebung der Anzeigen kommen. Bei einer Verwendung einer Anzeige in einem Kombiinstrument eines Kraftfahrzeuges kann z. B. der Radioempfang und/oder der Mobiltelefonempfang in dem Kraftfahrzeug gestört werden.Displays and the driver circuits controlling them are operated at high frequencies. This can lead to undesired electromagnetic interference in the area surrounding the displays. When using a display in an instrument cluster of a motor vehicle, for. B. the radio reception and / or cell phone reception in the motor vehicle.
Aufgabe der Erfindung ist es daher, eine Anzeige mit einer elektrisch leitenden Schicht anzugeben, die möglichst wenige elektromagnetischen Störungen verursacht und elektromagnetische Störungen, die von der Ansteuerelektronik verursacht werden, nicht durchläßt und die einfach und preiswert aufgebaut ist. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die elektrisch leitende Schicht hochfrequenzmäßig mit einem Schirmpotenzial verbunden ist. So wird erreicht, dass die elektrisch leitende Schicht hochfrequenzmäßig auf dem Schirmpotenzial liegt und so ein Durchgang von hohen Frequenzen verhindert wird. Die hochfrequenzmäßige Verbindung kann beispielsweise mit Kondensatoren erfolgen, die zwischen der elektrisch leitenden Schicht und dem Schirmpotenzial angeordnet sind, wobei jeweils ein Anschluss des Kondensators mit der elektrisch leitenden Schicht und ein Anschluss mit dem Schirmpotenzial verbunden ist. In Fällen, in denen eine gleichstrommäßige Verbindung zwischen der elektrisch leitenden Schicht und dem Schirmpotenzial nicht stört, ist es auch möglich, die Verbindung der Heizung und des Schirmpotenzials durch ein elektrisch leitfähiges Element herzustellen. Das Schirmpotenzial kann beispielsweise durch ein Metallgehäuse oder durch ein metallisiertes Gehäuse realisiert sein, wobei das Gehäuse durch die Anzeige geschlossen wird. Unter Umständen kann es je nach der erforderlichen Abschirmwirkung ausreichend sein, die Flüssigkristallanzeige hochfrequenzmäßig mit einem Massepotenzial zu verbinden.The object of the invention is therefore to provide a display with an electrically conductive layer which causes as few electromagnetic disturbances as possible and does not pass electromagnetic disturbances caused by the control electronics and which is simple and inexpensive. According to the invention, this object is achieved in that the electrically conductive layer is connected to a shield potential in terms of radio frequency. This ensures that the electrically conductive layer is at the shielding potential in terms of high frequency and thus prevents the passage of high frequencies. The high-frequency connection can be made, for example, with capacitors which are arranged between the electrically conductive layer and the shield potential, a connection of the capacitor being connected to the electrically conductive layer and a connection being connected to the shield potential. In cases in which a direct current connection between the electrically conductive layer and the shield potential does not interfere, it is also possible to establish the connection between the heater and the shield potential by means of an electrically conductive element. The shielding potential can be realized, for example, by a metal housing or by a metallized housing, the housing being closed by the display. Depending on the required shielding effect, it may be sufficient to connect the liquid crystal display to a ground potential by radio frequency.
Die elektrisch leitende Schicht kann aus Indium-Zinn-Oxyd (ITO) aufgebaut sein, welches die Anzeige flächig bedeckt.The electrically conductive layer can be constructed from indium tin oxide (ITO), which covers the display area.
Wenn die Anzeige als Flüssigkristallanzeige ausgestaltet ist, kann die elektrisch leitende Schicht als Heizvorrichtung ausgestaltet sein, die von einem Heizstrom durchflössen wird. Es ist auch möglich, die Heizvorrichtung mittels stromleitender Bahnen, die einzeln oder mäanderförmig angeordnet sind, zu realisieren. Wenn diese Bahnen zwischen den Elektroden der Flüssigkristallzellen verlaufen und aus Indium-Zinn-Oxyd bestehen,' sind sie in einem Arbeitsgang mit den Elektroden der Flüssigkristallzellen herstellbar .If the display is configured as a liquid crystal display, the electrically conductive layer can be configured as a heating device through which a heating current flows. It is also possible to implement the heating device by means of current-conducting tracks which are arranged individually or in a meandering shape. If these tracks run between the electrodes of the liquid crystal cells and consist of indium tin oxide, they can be produced in one operation with the electrodes of the liquid crystal cells.
Es ist auch möglich, dass die elektrisch leitende Schicht als Teil eines touch screen ausgestaltet ist. Hierbei kann die Anzeige beispielsweise als Flüssigkristallanzeige, OLED-An- zeige oder als Monitor ausgestaltet sein.It is also possible for the electrically conductive layer to be designed as part of a touch screen. The display can be configured, for example, as a liquid crystal display, OLED display or as a monitor.
Wenn die Anzeige als Flüssigkristallanzeige ausgestaltet ist und eine elektrisch leitende Schicht eines touch screens davor angeordnet ist, kann die elektrisch leitende Schicht gleichzeitig auch noch als Beheizung der Flüssigkristallanzeige verwendet werden.If the display is designed as a liquid crystal display and an electrically conductive layer of a touch screen is arranged in front of it, the electrically conductive layer can also be used at the same time as heating the liquid crystal display.
Die Erfindung wird nachfolgend anhand der Figuren näher erläutert. Es zeigen:The invention is explained in more detail below with reference to the figures. Show it:
Figur 1 einen Teilschnitt einer Flüssigkristallzelle mit flächig aufgebrachter Heizung und die Verbindung zu einem Schirmpotenzial; Figur 2 die Explosionszeichnung einer Vorder- und Rückwand einer Flüssigkristallzelle;1 shows a partial section of a liquid crystal cell with a surface-mounted heater and the connection to a screen potential; Figure 2 is an exploded view of a front and back wall of a liquid crystal cell;
Figur 3 den Schnitt durch eine Flüssigkristallzelle und ein Schirmgehäuse;FIG. 3 shows the section through a liquid crystal cell and a screen housing;
Figur 4 einen touch screen mit einem Monitor in Explosionsdarstellung .Figure 4 shows a touch screen with a monitor in an exploded view.
In Figur 1 weist eine Flüssigkristallzelle 1 eine vordere Wand 2a und eine hintere Wand 2b auf. Auf der vorderen Wand 2a und der hinteren Wand 2b sind jeweils flächig aufgebrachte Heizschichten 3a, 3b aufgebracht, die jeweils durch Isolierungen 4a, 4b von vorderen und hinteren Elektroden 5a, 5b getrennt sind. Die vorderen und hinteren Elektroden 5a, 5b werden schließlich durch Isolierungen 6a, 6b von einer Flüssigkristallsubstanz 7 getrennt. Die vorderen und hinteren Heizschichten 3a, 3b sind über Kontaktklemmen 8a, 8b, elektrische Leiter 9a, 9b, Kondensatoren 10a, 10b mit einem Massepotenzial M verbunden. So können auf die Heizschichten 3a, 3b auftreffende Hochfrequenzstörungen über die Kontaktklemmen 8a, 8b elektrischen Leiter 9a, 9b Kondensatoren 10a, 10b zum Massepotenzial M geleitet werden.In FIG. 1, a liquid crystal cell 1 has a front wall 2a and a rear wall 2b. On the front wall 2a and the rear wall 2b, flat heating layers 3a, 3b are applied, each of which is separated from the front and rear electrodes 5a, 5b by insulation 4a, 4b. The front and rear electrodes 5a, 5b are finally separated from a liquid crystal substance 7 by insulation 6a, 6b. The front and rear heating layers 3a, 3b are connected to a ground potential M via contact terminals 8a, 8b, electrical conductors 9a, 9b, capacitors 10a, 10b. High-frequency interference striking the heating layers 3a, 3b can be conducted to the ground potential M via the contact terminals 8a, 8b, electrical conductors 9a, 9b, capacitors 10a, 10b.
Eine Verklebung 11 verbindet die vordere Wand 2a mit der hinteren Wand 2b und verhindert ein Austreten der Flüssigkristallsubstanz 7.An adhesive bond 11 connects the front wall 2a to the rear wall 2b and prevents the liquid crystal substance 7 from escaping.
Die Ansteuerung der Elektroden 5a, 5b zur Beeinflussung der Flüssigkristallsubstanz 7 ist seit langem bekannt und wird daher hier nicht weiter ausgeführt.The activation of the electrodes 5a, 5b for influencing the liquid crystal substance 7 has been known for a long time and is therefore not described further here.
In Figur 2 erkennt man eine vordere Wand 12a und eine hintere Wand 12b einer anderen Flüssigkristallzelle. Auf der vorderen Wand 12a sind Elektroden 13a und auf der hinteren Wand 12b Elektroden 13b angeordnet. Zwischen den Elektroden 13a der vorderen Wand 12a sind Heizdrähte 14a angeordnet, die miteinander über Kontaktstifte 15 und auf der hinteren Wand 12b angeordnete Verbindungen 16a verbunden sind und so in Reihe geschaltet sind. Zwischen den Elektroden 13b der hinteren Wand sind Heizdrähte 14b angeordnet, die ebenfalls über nicht dargestellte Kontaktstifte und auf der vorderen Wand 12a angeordnete Verbindungen 16b verbunden und so in Reihe geschaltet sind. Die Heizdrähte 14a, 14b sind über Anschlüsse 17a, 17b mit einem nicht dargestellten Schirmpotenzial verbunden. Durch die Anordnung der Heizdrähte 16a, 16b zueinander im rechten Winkel ergibt sich eine insgesamt gitterförmige Anordnung der Heizdrähte 16a, 16b zueinander, so dass bei einer hochfrequenzmäßigen Verbindung mit einem Schirmpotenzial ein Durchtritt von Hochfrequenzen durch eine Anzeige verhindern, die die in Figur 2 dargestellten Bauteile aufweist.A front wall 12a and a rear wall 12b of another liquid crystal cell can be seen in FIG. Electrodes 13a are arranged on the front wall 12a and electrodes 13b are arranged on the rear wall 12b. Between the electrodes 13a Heating wires 14a are arranged at the front wall 12a, which are connected to one another via contact pins 15 and connections 16a arranged on the rear wall 12b and are thus connected in series. Between the electrodes 13b of the rear wall, heating wires 14b are arranged, which are also connected via contact pins (not shown) and connections 16b arranged on the front wall 12a and are thus connected in series. The heating wires 14a, 14b are connected to a shield potential (not shown) via connections 17a, 17b. The arrangement of the heating wires 16a, 16b at right angles to one another results in an overall lattice-shaped arrangement of the heating wires 16a, 16b with respect to one another, so that in the case of a high-frequency connection to a shielding potential, high frequencies are prevented by a display which the components shown in FIG. 2 prevent having.
Figur 3 zeigt eine Flüssigkristallzelle 1 mit einer nicht dargestellten Heizung, die wie die Heizungen der in Figur 1 oder 2 dargestellten Flüssigkristallzellen ausgeführt sein kann. Die Heizvorrichtung ist über Kontaktklemmen 8a, 8b und Kondensatoren 10a, 10b mit einem Schirmgehäuse 20 elektrisch verbunden. Das Schirmgehäuse 20 kann aus Metall hergestellt oder mit einem Metall überzogen sein. So ist das Innere des Schirmgehäuses 20 weitgehend von der Umgebung des Schirmgehäuses hochfrequenzmäßig getrennt . Es können keine Störungen von außen in das Innere eindringen. Ebenso können auch Störungen, die durch eine Ansteuerschaltung 21 verursacht werden, nicht nach außen dringen und so Geräte in der Umgebung der Flüssigkristallzelle 1 nicht stören.Figure 3 shows a liquid crystal cell 1 with a heater, not shown, which can be designed like the heaters of the liquid crystal cells shown in Figure 1 or 2. The heating device is electrically connected to a shield housing 20 via contact terminals 8a, 8b and capacitors 10a, 10b. The shield housing 20 can be made of metal or coated with a metal. The interior of the shield housing 20 is largely separated from the surroundings of the shield housing in terms of radio frequency. No external interference can penetrate into the interior. Likewise, disturbances caused by a control circuit 21 cannot escape to the outside and thus do not disturb devices in the vicinity of the liquid crystal cell 1.
In Figur 4 erkennt man einen Monitor 21, eine Glasschicht 22, transparente Metallfilme 23, 24, ein Elektronenraster 25 und eine Glasschicht 26. Die Glasschicht 22 ist mit den Metallfilmen 23, 24 bedampft. Auf dem Metallfilm 23 ist im Randbereich das Elektronenraster 25 aufgedampft. Die Glasschicht 26 ist zum Schutz des touch screens aufgebracht. Das Elektronenraster 25 wird an allen vier Ecken eine niedrige Wechselspan- nung angelegt. Wird nun die Bildschirmoberfläche mit einem Finger berührt, zieht das Potenzial des Fingers von jedem Eckpunkt eine winzige Ladungsmenge an. Da der Stromfluß von vier Ecken des touch screens proportional zum Abstand zwischen Ecke und Berührungspunkt ist, kann die genaue Stelle errechnet werden, an dem der touch screen berührt wurde und so das diesem Bereich des Monitors dargestellte Menü, Untermenü, oder der dargestellte Wert oder Icon ausgewählt werden. Der Metallfilm 24 ist über einen Kondensator 10 mit dem Massepotenzial M verbunden. So werden hochfrequente elektromagnetische Strahlungen des Monitors oder einer sonstigen anstelle des Monitors 21 vorhandenen Anzeige abgeschirmt.4 shows a monitor 21, a glass layer 22, transparent metal films 23, 24, an electron grid 25 and a glass layer 26. The glass layer 22 is vapor-coated with the metal films 23, 24. The electron grid 25 is evaporated on the metal film 23 in the edge region. The glass layer 26 is applied to protect the touch screen. The electron grid 25 will have a low alternating voltage at all four corners. created. If you now touch the screen surface with a finger, the potential of the finger attracts a tiny amount of charge from each corner point. Since the current flow from four corners of the touch screen is proportional to the distance between the corner and the point of contact, the exact point at which the touch screen was touched can be calculated, and thus the menu, submenu, value or icon displayed for this area of the monitor to be selected. The metal film 24 is connected to the ground potential M via a capacitor 10. High-frequency electromagnetic radiation from the monitor or another display instead of the monitor 21 is thus shielded.
Wenn anstelle des Monitors 21 eine Flüssigkristallanzeige verwendet wird, kann der Metallfilm 24 gleichzeitig zum Beheizen der Flüssigkristallanzeige verwendet werden. If a liquid crystal display is used instead of the monitor 21, the metal film 24 can be used simultaneously for heating the liquid crystal display.

Claims

Patentansprüche claims
1. Anzeige (1) mit einer elektrischen Schicht (3a, 3b, 14a, 14b), dadurch gekennzeichnet, dass die elektrisch leitende Schicht (3a, 3b, 14a, 14b) hochfrequenzmäßig mit einem Schirmpotenzial (M, 20) verbunden ist.1. Display (1) with an electrical layer (3a, 3b, 14a, 14b), characterized in that the electrically conductive layer (3a, 3b, 14a, 14b) is connected in terms of radio frequency to a shield potential (M, 20).
2. Anzeige nach Anspruch 1, dadurch gekennzeichnet, dass die elektrisch leitende Schicht (3a, 3b, 14a, 14b) über Kapazitäten mit einem Schirmpotenzial (M, 20) verbunden ist .2. Display according to claim 1, characterized in that the electrically conductive layer (3a, 3b, 14a, 14b) is connected to a screen potential (M, 20) via capacitances.
3. Anzeige nach Anspruch 2, dadurch gekennzeichnet, dass die Kapazitäten als Kondensatoren (10a, 10b) realisiert sind.3. Display according to claim 2, characterized in that the capacitances are realized as capacitors (10a, 10b).
4. Anzeige nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Schirmpotenzial als Metallgehäuse (20) oder metallisiertes Gehäuse realisiert ist, welches durch die Anzeige (1) geschlossen wird.4. Display according to one of the preceding claims, characterized in that the shield potential is realized as a metal housing (20) or metallized housing, which is closed by the display (1).
5. Anzeige nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das als Schirmpotenzial ein Massepotenzial (M) verwendet wird.5. Display according to one of the preceding claims, characterized in that a ground potential (M) is used as the screen potential.
6. Anzeige nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die elektrisch leitende Schicht (3a, 3b) aus Indium-Zinn-Oxyd aufgebaut ist und die Flüssigkristallanzeige (1) flächig bedeckt.6. Display according to one of the preceding claims, characterized in that the electrically conductive layer (3a, 3b) is constructed from indium tin oxide and covers the liquid crystal display (1) over a large area.
7. Anzeige nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Anzeige als Flüssigkristallanzeige ausgestaltet ist, dass die elektrisch leitende Schicht (3a, 3b, 14a, 14b) als Heizvorrichtung ausgestaltet ist.7. Display according to one of the preceding claims, characterized in that the display is designed as a liquid crystal display, that the electrically conductive layer (3a, 3b, 14a, 14b) is designed as a heating device.
8. Anzeige nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass die elektrisch leitende Schicht als Heiz- Vorrichtung ausgestattet ist und aus stromleitenden Bahnen (14a, 14b) besteht, die auf der Flüssigkristallanzeige angeordnet sind.8. Display according to one of claims 1-5, characterized in that the electrically conductive layer as a heating Device is equipped and consists of current-conducting tracks (14a, 14b) which are arranged on the liquid crystal display.
9. Anzeige nach Anspruch 7, dadurch gekennzeichnet, dass die stromleitenden Bahnen (14a, 14b) zwischen Elektroden (13a, 13b) der Flüssigkristallanzeige angeordnet sind.9. Display according to claim 7, characterized in that the current-conducting tracks (14a, 14b) are arranged between electrodes (13a, 13b) of the liquid crystal display.
10. Anzeige nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die stromleitenden Bahnen (14a, 14b) aus Indium-Titan-Oxyd hergestellt sind.10. Display according to claim 7 or 8, characterized in that the current-conducting tracks (14a, 14b) are made of indium titanium oxide.
11. Anzeige nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die elektrisch leitende Schicht als Teil eines touch screens ausgestaltet ist .11. Display according to one of claims 1 to 6, characterized in that the electrically conductive layer is designed as part of a touch screen.
12. Anzeige nach Anspruch 11, dadurch gekennzeichnet, dass die Anzeige als Flüssigkristallanzeige ausgestaltet ist, dass die elektrisch leitende Schicht auch zur Beheizung der Flüssigkristallanzeige verwendet wird. 12. Display according to claim 11, characterized in that the display is designed as a liquid crystal display, that the electrically conductive layer is also used for heating the liquid crystal display.
EP01991648A 2000-12-23 2001-12-20 Display with an electrically conducting layer Withdrawn EP1346312A2 (en)

Applications Claiming Priority (3)

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DE10064921 2000-12-23
DE10064921A DE10064921A1 (en) 2000-12-23 2000-12-23 Liquid crystal display with a heater
PCT/DE2001/004811 WO2002052495A2 (en) 2000-12-23 2001-12-20 Display with an electrically conducting layer

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EP1346312A2 true EP1346312A2 (en) 2003-09-24

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JP (1) JP4149811B2 (en)
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WO2002052495A2 (en) 2002-07-04
JP2004516685A (en) 2004-06-03
US7259809B2 (en) 2007-08-21
US20040075786A1 (en) 2004-04-22
WO2002052495A3 (en) 2003-02-27
JP4149811B2 (en) 2008-09-17
DE10064921A1 (en) 2002-07-18

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