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WO1993004568A1 - Electroluminescent display - Google Patents

Electroluminescent display Download PDF

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Publication number
WO1993004568A1
WO1993004568A1 PCT/DE1992/000621 DE9200621W WO9304568A1 WO 1993004568 A1 WO1993004568 A1 WO 1993004568A1 DE 9200621 W DE9200621 W DE 9200621W WO 9304568 A1 WO9304568 A1 WO 9304568A1
Authority
WO
WIPO (PCT)
Prior art keywords
electroluminescent display
opto
electronic device
display
eld
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.)
Ceased
Application number
PCT/DE1992/000621
Other languages
German (de)
French (fr)
Inventor
Peter Knoll
Winfried Koenig
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to JP5504012A priority Critical patent/JPH06509999A/en
Publication of WO1993004568A1 publication Critical patent/WO1993004568A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10541—Functional features of the laminated safety glass or glazing comprising a light source or a light guide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/23—Head-up displays [HUD]
    • B60K35/234—Head-up displays [HUD] controlling the brightness, colour or contrast of virtual images depending on the driving conditions or on the condition of the vehicle or the driver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/28—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/60—Instruments characterised by their location or relative disposition in or on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/80—Arrangements for controlling instruments
    • B60K35/81—Arrangements for controlling instruments for controlling displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0472—Traffic signs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/77—Instrument locations other than the dashboard
    • B60K2360/785—Instrument locations other than the dashboard on or in relation to the windshield or windows

Definitions

  • the invention relates to an opto-electronic device for displaying information according to the preamble of the main claim.
  • an optical device on motor vehicles is already known, in which information is projected onto the windshield of a motor vehicle by means of an optic as a head-up display (HUD).
  • the information displayed by the display elements is projected onto the windshield in the area of the driver's primary field of vision via a lens and mirror system which is located below the windshield.
  • the device is very complex to produce, since in addition to the optical display elements, a corresponding lens system, mirror and an illumination device are required. Overall, these devices require a great deal of space, which is generally required for other devices in the area of the dashboard and is therefore hardly available.
  • the contrast can be impaired by dust influences and deposits in the optical beam path of the display.
  • a method is known in which information can be projected onto a layer of a pane using a holographic mirror, which selectively reflects only light of a very narrow wavelength range. Other wavelengths of light are let through almost without attenuation, so that the layer acting as a holographic combiner appears almost completely transparent to the viewer.
  • holographic projection With holographic projection, a high-contrast, bright image of the information to be displayed appears in a predetermined color on the side of the combiner facing away from the viewer.
  • the production of the holographic combiner which is embedded as an intermediate layer of a front pane usually produced as laminated glass, is relatively complicated. This manufacturing process is not yet mastered.
  • the optoelectronic device according to the invention with the characterizing features of the main claim has the advantage that it does not require any space in the area of the dashboard of a vehicle. It is particularly advantageous that the electroluminescent display (ELD) can be applied directly to the windshield or into an intermediate layer of a laminated glass pane, so that the information can be displayed directly on the windshield via thin electrical leads to the ELD. It is also particularly advantageous that the ELD is practically invisible when switched off and that the windshield maintains its light transmission to a large extent. Another particular advantage is that the production of an ELD can be carried out with very simple means, since only a few work steps are required. The measures listed in the subclaims enable advantageous further developments and improvements of the optoelectronic device specified in the main claim.
  • the ELD is a thin-film electroluminescence display (ACTFEL).
  • ACTFEL thin-film electroluminescence display
  • the ELD is also favorable to design the ELD as a matrix structure, the matrix points of which can be controlled via thin-film lines.
  • the matrix structure ensures extensive freedom of design for the information display.
  • the thin-film lines are produced on the carrier material using the Aufda pf compiler and are only a few angstroms thick, so that they are practically invisible and hardly affect the transmission of the disc.
  • the display can also be produced in color, so that both the contrast and the clarity can be optimized.
  • the brightness of the ELD can be regulated as a function of the ambient light of the vehicle window. Since the measurement of the brightness by means of a phototransistor can be carried out very easily, the brightness can be adjusted both in daylight and during night driving, so that no disturbing glare can occur. The advantage here is that the ELD can be controlled very simply by changing the frequency of the supply voltage. There are particular advantages for displaying information if the ELD is arranged in the driver's primary field of vision. This enables the driver to read the information without being too distracted from the driving situation.
  • an ELD to display warning notices on the rear window of a vehicle, which preferably light up when the brake and / or the turn signal lifter are actuated. Since the rear window is generally visible at the eye level of a subsequent driver, the warnings are particularly easy to recognize. These displays can then be switched on in particular when driving at night or in fog.
  • a polarization filter is to be regarded as advantageous for the anti-reflective coating of the display.
  • the birefringence at the disk / air interface can be effectively suppressed by the polarization filter. Further advantages of the invention can be found in the description.
  • FIG. 1 shows the arrangement of an electroluminescent display on a vehicle window
  • FIG. 2 shows the spatial structure of the electroluminescent display
  • FIG. 3 shows a block diagram for controlling the electroluminescent display.
  • FIG. 1 shows a vehicle window 4 which is constructed as a laminated glass window with the glass substrates 1, 2.
  • the two glass substrates 1, 2 are glued through a plastic film 3.
  • ELD Electroluminescent display
  • the ELD 6 is designed as an AC voltage thin-film electroluminescence display (ACTFEL).
  • ACTFEL AC voltage thin-film electroluminescence display
  • the display has thin-film feed lines 8, which are led out downwards and can be used to control the ELD.
  • a luminescence layer 34 is arranged between two insulation foils 32, 33.
  • the luminescent layer contains, for example, a zinc sulfide that is enriched with manganese, terbium or other substances.
  • Electrodes 30, 31 are attached crosswise on the outer sides of the insulation layers 32, 33. The respective overlapping areas illuminate the luminescent layer 34 lying in between when a voltage is applied to the associated electrodes 30, 31.
  • An ACTFEL display is produced using the ALE process (atomic layer epitaxy). The display is extremely thin (less than 100 nm) and can be applied to a glass film that does not exceed the thickness of the plastic film 3 that is usually used.
  • the production of a thin film electroluminescence display is known per se and is not the subject of the invention. It is advantageous that the ELD 6 is extremely thin and can therefore be easily installed in the intermediate layer 3 of the vehicle window 4. As a result of the thin, vapor-deposited electrodes, the display in the switched-off state is no more recognizable than the supply lines 8.
  • the supply lines are led out at a suitable point in the lower or lateral area of the pane and connected to corresponding outputs of a control device 20 according to FIG. 3 . Such connections are problem-free since a similar contacting method is used in the manufacture of digital clocks.
  • control device 20 has a plurality of inputs, to which, for example, an input 21 is connected, which receives its data from the tachometer or other sources. Furthermore, a connection for a light sensor 10 is provided, which according to the Figure 1 detects the brightness of the ambient light on the inside of the vehicle window 4. Another input for the control device 20 is provided for a brightness controller 23 with which the brightness of the ELD can be adjusted.
  • the tachometer supplies, for example, the desired data such as speed, mileage, tank content or similar data to the control device 20, which are prepared accordingly for the display ELD 6 so that they can be displayed.
  • the input 21 can, however, also be connected to a navigation system, so that the street maps or directions can also be recorded and then displayed.
  • the light sensor 10 is, for example, a phototransistor, which emits a voltage signal to the control device 20 depending on the ambient light. If the ambient brightness is high, the brightness of the ELD 6 is increased, while it is reduced, for example, in the dark.
  • the brightness controller 23 controls, for example, the frequency of the supply voltage U for the ELD 6. Since the brightness of an ELD can be changed by changing the frequency of the supply voltage, there is a simple possibility for a contrast adjustment.
  • the control device 20 contains assemblies known to those skilled in the art, such as decoders, memories, driver stages, which are required to control the ELD 6.
  • the modules are commercially available, so that a detailed description is not necessary.
  • FIG. 2 only two pairs of electrodes are shown for reasons of clarity.
  • the number of electrodes 30, 31 is arbitrarily selectable and depends on the number of points of the matrix to be controlled.
  • a display can also be equipped with discrete picture elements (eg 7-segment layout).
  • Both the light sensor 10 and the brightness controller 23 act on a frequency control module of the control device 20, with which the brightness of the ELD 6 can be controlled.
  • a corresponding ELD 6 in the rear window of a vehicle.
  • the display can then in particular depict warning functions such as 'stop', 'caution', 'caution', corresponding blinking symbols for turning left or right, etc.
  • a warning sign 'Please keep your distance' is switched on if a following vehicle is opened too tightly.
  • the display can therefore advantageously also contribute to increasing traffic safety.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Instrument Panels (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)

Abstract

Proposed is an optronic device for the display of information on a vehicle window (4), the device using an electroluminescent display (6) as a head-up display. The electroluminescent display is designed as an a.c. thin-film device and is transparent when switched off. When the device is switched on, vehicle-related or other information can be displayed in the driver's field of vision. The display (6) is incorporated in an intermediate layer in a composite glass window. If the display is built into the rear window of a motor vehicle, warning information can be displayed, thus enhancing traffic safety.

Description

Elektrolumineszenz-AnzeicreElectroluminescent display

Stand der TechnikState of the art

Die Erfindung geht aus von einer opto-elektronischen Einrichtung zur Anzeige von Informationen nach der Gattung des Hauptanspruchs. Aus der DE-PS 33 47 271 ist schon eine optische Einrichtung an Kraft¬ fahrzeugen bekannt, bei der Informationen über eine Optik als Head-up-Display (HUD) auf die Windschutzscheibe eines Kraftfahrzeu¬ ges projeziert werden. Dabei werden die von den Anzeigeelementen dargestellten Informationen über ein Linsen- und Spiegelsystem, das sich unterhalb der Windschutzscheibe befindet, im Bereich des pri¬ mären Sichtfeldes des Fahrers auf die Windschutzscheibe projeziert. Die Einrichtung ist sehr aufwendig in der Herstellung, da neben den optischen Anzeigeelementen ein entsprechendes Linsensystem, Spiegel sowie eine Beleuchtungseinrichtung erforderlich sind. Diese Ein¬ richtungen benötigen insgesamt sehr viel Platz, der im Bereich des Armaturenbrettes im allgemeinen für andere Geräte benötigt wird und damit kaum vorhanden ist. Hinzu kommt, daß durch Staubeinflüsse und Ablagerungen im optischen Strahlengang der Anzeige der Kontrast beeinträchtigt werden kann. Desweiteren ist ein Verfahren bekannt, bei dem mittels eines holo¬ graphischen Spiegels, welcher selektiv nur Licht eines sehr schmalen Wellenlängenbereiches reflektiert, Informationen auf eine Schicht einer Scheibe projeziert werden können. Andere Wellenlängen des Lichtes werden nahezu ungeschwächt hindurchgelassen, so daß die als holographischer Combiner wirkende Schicht für den Betrachter nahezu völlig transparent erscheint. Bei der holographischen Projektion erscheint auf der dem Betrachter abgewandten Seite des Combiners ein kontrastreiches, helles Bild der darzustellenden Informationen in einer vorgegebenen Farbe. Die Herstellung des holographischen Combiners, der als Zwischenschicht einer üblicherweise als Verbund¬ glas hergestellten Frontscheibe eingebettet ist, ist relativ kompliziert. Dieser Herstellungsprozess wird gegenwärtig noch nicht beherrscht.The invention relates to an opto-electronic device for displaying information according to the preamble of the main claim. From DE-PS 33 47 271 an optical device on motor vehicles is already known, in which information is projected onto the windshield of a motor vehicle by means of an optic as a head-up display (HUD). The information displayed by the display elements is projected onto the windshield in the area of the driver's primary field of vision via a lens and mirror system which is located below the windshield. The device is very complex to produce, since in addition to the optical display elements, a corresponding lens system, mirror and an illumination device are required. Overall, these devices require a great deal of space, which is generally required for other devices in the area of the dashboard and is therefore hardly available. In addition, the contrast can be impaired by dust influences and deposits in the optical beam path of the display. Furthermore, a method is known in which information can be projected onto a layer of a pane using a holographic mirror, which selectively reflects only light of a very narrow wavelength range. Other wavelengths of light are let through almost without attenuation, so that the layer acting as a holographic combiner appears almost completely transparent to the viewer. With holographic projection, a high-contrast, bright image of the information to be displayed appears in a predetermined color on the side of the combiner facing away from the viewer. The production of the holographic combiner, which is embedded as an intermediate layer of a front pane usually produced as laminated glass, is relatively complicated. This manufacturing process is not yet mastered.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße opto-elektronische Einrichtung mit den kenn¬ zeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vor¬ teil, daß sie im Bereich des Armaturenbrettes eines Fahrzeuges kei¬ nen Platz benötigt. Besonders vorteilhaft ist, daß das Elektrolumi- neszenz-Display (ELD) direkt auf die Windschutzscheibe oder in eine Zwischenschicht einer Verbundglasscheibe aufgebracht werden kann, so daß über dünne elektrische Zuleitungen zu dem ELD die Informationen direkt auf der Windschutzscheibe dargestellt werden können. Beson¬ ders vorteilhaft ist weiter, daß die ELD im ausgeschalteten Zustand praktisch nicht sichtbar ist und die Windschutzscheibe ihre Licht¬ transmission in großem Maß beibehält. Als besonderer Vorteil ist weiter hervorzuheben, daß die Herstellung einer ELD mit sehr ein¬ fachen Mitteln durchführbar ist, da nur wenige Arbeitsschritte benö¬ tigt werden. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor¬ teilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen opto-elektronischen Einrichtung möglich. Besonders vor¬ teilhaft ist, daß die ELD eine Dünnfilm-Elektrolumineszenz-Anzeige (ACTFEL) ist. Die gesamte Anzeige ist extrem dünn als Film herstell¬ bar, so daß sie ohne größere Mühe in die Zwischenschicht einer Ver¬ bundscheibe eingeklebt werden kann. Dadurch ist sie vor äußeren Be¬ schädigungen durch Kratzen oder Verschmutzung geschützt.In contrast, the optoelectronic device according to the invention with the characterizing features of the main claim has the advantage that it does not require any space in the area of the dashboard of a vehicle. It is particularly advantageous that the electroluminescent display (ELD) can be applied directly to the windshield or into an intermediate layer of a laminated glass pane, so that the information can be displayed directly on the windshield via thin electrical leads to the ELD. It is also particularly advantageous that the ELD is practically invisible when switched off and that the windshield maintains its light transmission to a large extent. Another particular advantage is that the production of an ELD can be carried out with very simple means, since only a few work steps are required. The measures listed in the subclaims enable advantageous further developments and improvements of the optoelectronic device specified in the main claim. It is particularly advantageous that the ELD is a thin-film electroluminescence display (ACTFEL). The entire display can be produced extremely thinly as a film, so that it can be glued into the intermediate layer of a composite pane without great effort. As a result, it is protected against external damage from scratching or contamination.

Günstig ist weiterhin die Ausbildung der ELD als Matrixstruktur, de¬ ren Matrixpunkte über Dünnschicht-Leitungen ansteuerbar sind. Durch die Matrixstruktur ist eine weitgehende Gestaltungsfreiheit der In¬ formationsanzeige gewährleistet. Die Dünnschichtleitungen werden auf das Trägermaterial im Aufda pfverfahren hergestellt und sind nur wenige Angström dick, so daß sie praktisch nicht sichtbar sind und die Transmission der Scheibe kaum beeinflussen.It is also favorable to design the ELD as a matrix structure, the matrix points of which can be controlled via thin-film lines. The matrix structure ensures extensive freedom of design for the information display. The thin-film lines are produced on the carrier material using the Aufda pfverfahren and are only a few angstroms thick, so that they are practically invisible and hardly affect the transmission of the disc.

Durch die Wahl von geeigneten Fluoreszenzstoffen ist die Anzeige auch farblich herstellbar, so daß sowohl der Kontrast als auch die Übersichtlichkeit optimiert werden können.By choosing suitable fluorescent materials, the display can also be produced in color, so that both the contrast and the clarity can be optimized.

Besondere Vorteile ergeben sich dadurch, daß die Helligkeit der ELD in Abhängigkeit vom Umgebungslicht der Fahrzeugscheibe regelbar ist. Da die Messung der Helligkeit mittels eines Fototransistors sehr einfach durchführbar ist, kann eine Helligkeitsanpassung sowohl bei Tageslicht als auch bei Nachtfahrten erfolgen, so daß keine stören¬ den Blendungen auftreten können. Dabei ist von Vorteil, daß die ELD sehr einfach durch Änderung der Frequenz der Versorgungsspannung steuerbar ist. Besondere Vorteile ergeben sich für die Anzeige von Informationen, wenn die ELD im primären Sichtfeld des Fahrers angeordnet ist. So kann der Fahrer die Informationen lesen, ohne daß er all zu sehr vom Fahrgeschehen abgelenkt wird.Particular advantages result from the fact that the brightness of the ELD can be regulated as a function of the ambient light of the vehicle window. Since the measurement of the brightness by means of a phototransistor can be carried out very easily, the brightness can be adjusted both in daylight and during night driving, so that no disturbing glare can occur. The advantage here is that the ELD can be controlled very simply by changing the frequency of the supply voltage. There are particular advantages for displaying information if the ELD is arranged in the driver's primary field of vision. This enables the driver to read the information without being too distracted from the driving situation.

Auch ist günstig, mit einer ELD Warnhinweise auf der Heckscheibe eines Fahrzeuges anzuzeigen, die vorzugsweise bei Betätigung der Bremse und/oder des Blinkhebers aufleuchten. Da die Heckscheibe im allgemeinen in Augenhöhe eines nachfolgenden Fahrers sichtbar ist, sind die Warnhinweise besonders gut erkennbar. Diese Anzeigen können dann insbesondere bei Nachtfahrten oder im Nebel eingeschaltet wer¬ den.It is also favorable to use an ELD to display warning notices on the rear window of a vehicle, which preferably light up when the brake and / or the turn signal lifter are actuated. Since the rear window is generally visible at the eye level of a subsequent driver, the warnings are particularly easy to recognize. These displays can then be switched on in particular when driving at night or in fog.

Zur Entspiegelung der Anzeige ist das Vorschalten eines Polarisa¬ tionsfilters als vorteilhaft anzusehen. Durch das Polarisationsfil¬ ter kann' die Doppelbrechung an der Grenzschicht Scheibe/Luft wir¬ kungsvoll unterdrückt werden. Weitere Vorteile der Erfindung sind der Beschreibung entnehmbar.The provision of a polarization filter is to be regarded as advantageous for the anti-reflective coating of the display. The birefringence at the disk / air interface can be effectively suppressed by the polarization filter. Further advantages of the invention can be found in the description.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung darge¬ stellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 die Anordnung einer Elektrolumineszenz-Anzeige an einer Fahrzeugscheibe, Figur 2 den raumbildlichen Aufbau der Elektrolumineszenz-Anzeige und Figur 3 ein Blockschaltbild zur Steuerung der Elektrolumineszenz-Anzeige.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows the arrangement of an electroluminescent display on a vehicle window, FIG. 2 shows the spatial structure of the electroluminescent display, and FIG. 3 shows a block diagram for controlling the electroluminescent display.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Figur 1 zeigt eine Fahrzeugscheibe 4, die als Verbundglasscheibe mit den Glassubstraten 1, 2 aufgebaut ist. Die beiden Glassubstrate 1, 2 werden durch eine Kunststoffolie 3 verklebt. Im unteren Teil der Fahrzeugscheibe 4, im primären Blickfeld des Fahrers 5, ist eine Elektrolumineszenz-Anzeige (ELD) 6 angeordnet. Die ELD 6 ist als Wechselspannungs-Dünnfilm-Elektrolumineszenz-Anzeige ausgebildet (ACTFEL). Die Anzeige weist Dünnschicht-Zuleitungen 8 auf, die nach unten herausgeführt sind und zur Ansteuerung der ELD verwendbar sind.FIG. 1 shows a vehicle window 4 which is constructed as a laminated glass window with the glass substrates 1, 2. The two glass substrates 1, 2 are glued through a plastic film 3. In the lower part of the vehicle window 4, in the primary field of vision of the driver 5, there is one Electroluminescent display (ELD) 6 arranged. The ELD 6 is designed as an AC voltage thin-film electroluminescence display (ACTFEL). The display has thin-film feed lines 8, which are led out downwards and can be used to control the ELD.

In Figur 2 ist der prinzipielle Aufbau einer ELD-Struktur darge¬ stellt. Zwischen zwei Isolationsfolien 32, 33 ist eine Lumi¬ neszenz-Schicht 34 angeordnet. Je nach Art und gewünschter Farbe enthält die Lumineszenz-Schicht beispielsweise ein Zinksulfid, das mit Mangan, Terbium oder anderen Stoffen angereichert ist. An den Außenseiten der Isolationsschichten 32, 33 sind kreuzweise Elektro¬ den 30, 31 angebracht. Die jeweils sich überlappenden Flächen lassen die dazwischenliegende Lumineszenz-Schicht 34 aufleuchten, wenn an den zugeordneten Elektroden 30, 31 eine Spannung angelegt wird. Die Herstellung einer ACTFEL-Anzeige erfolgt nach dem ALE-Verfahren (Atom-Lagen Epitaxie). Die Anzeige ist extrem dünn (weniger 100 nm) und kann auf einer Glasfolie aufgebracht werden, die die Dicke der üblicherweise verwendeten Kunststoffolie 3 nicht überschreitet. Die Herstellung einer Dünnfilm-Elektrolumineszenz-Anzeige ist per se be¬ kannt und nicht Gegenstand der Erfindung. Vorteilhaft ist, daß die ELD 6 extrem dünn ist und dadurch problemlos in der Zwischenschicht 3 der Fahrzeugscheibe 4 einbaubar ist. Durch die dünnen aufge¬ dampften Elektroden ist die Anzeige im ausgeschalteten Zustand eben¬ sowenig erkennbar wie die Zuleitungen 8. Die Zuleitungen werden an geeigneter Stelle im unteren oder seitlichen Bereich der Scheibe herausgeführt und mit entsprechenden Ausgängen einer Steuervorrich¬ tung 20 gemäß der Figur 3 verbunden. Derartige Verbindungen sind problemlos, da ein ähnliches Kontaktierungsfahren bei der Herstel¬ lung von Digitaluhren verwendet wird.The basic structure of an ELD structure is shown in FIG. A luminescence layer 34 is arranged between two insulation foils 32, 33. Depending on the type and desired color, the luminescent layer contains, for example, a zinc sulfide that is enriched with manganese, terbium or other substances. Electrodes 30, 31 are attached crosswise on the outer sides of the insulation layers 32, 33. The respective overlapping areas illuminate the luminescent layer 34 lying in between when a voltage is applied to the associated electrodes 30, 31. An ACTFEL display is produced using the ALE process (atomic layer epitaxy). The display is extremely thin (less than 100 nm) and can be applied to a glass film that does not exceed the thickness of the plastic film 3 that is usually used. The production of a thin film electroluminescence display is known per se and is not the subject of the invention. It is advantageous that the ELD 6 is extremely thin and can therefore be easily installed in the intermediate layer 3 of the vehicle window 4. As a result of the thin, vapor-deposited electrodes, the display in the switched-off state is no more recognizable than the supply lines 8. The supply lines are led out at a suitable point in the lower or lateral area of the pane and connected to corresponding outputs of a control device 20 according to FIG. 3 . Such connections are problem-free since a similar contacting method is used in the manufacture of digital clocks.

Der Figur 3 ist weiter entnehmbar, daß die Steuervorrichtung 20 mehrere Eingänge aufweist, an die beispielsweise eine Eingabe 21 angeschlossen ist, die ihre Daten von dem Tachometer oder anderen Quellen erhält. Desweiteren ist ein Anschluß für einen Lichtsensor 10 vorgesehen, der gemäß der Figur 1 an der Innenseite der Fahrzeugscheibe 4 die Helligkeit des Umgebungslichtes erfaßt. Ein weiterer Eingang für die Steuerein¬ richtung 20 ist für einen Helligkeitsregler 23 vorgesehen, mit dem die Helligkeit der ELD eingestellt werden kann.It can also be seen from FIG. 3 that the control device 20 has a plurality of inputs, to which, for example, an input 21 is connected, which receives its data from the tachometer or other sources. Furthermore, a connection for a light sensor 10 is provided, which according to the Figure 1 detects the brightness of the ambient light on the inside of the vehicle window 4. Another input for the control device 20 is provided for a brightness controller 23 with which the brightness of the ELD can be adjusted.

Der Tachometer liefert beispielsweise die gewünschten Daten wie Geschwindigkeit, Kilometerstand, Tankinhalt oder ähnliche Daten an die Steuervorrichtung 20 die für die Anzeige ELD 6 entsprechend auf¬ bereitet werden, so daß sie anzeigbar sind. Die Eingabe 21 kann aber auch mit einem Navigationssystem verbunden sein, so daß auch die Straßenkarten oder Fahrtrichtungsanweisungen erfaßt und dann zur Anzeige gebracht werden können. Der Lichtsensor 10 ist beispielswei¬ se ein Fototransistor, der in Abhängigkeit vom Umgebungslicht ein Spannungssignal an die Steuervorrichtung 20 abgibt. Bei großer Umge¬ bungshelligkeit wird die Leuchtstärke der ELD 6 erhöht, während sie beispielsweise bei Dunkelheit verringert wird. Der Helligkeitsregler 23 steuert beispielsweise die Frequenz der Versorgungsspannung U für die ELD 6. Da die Helligkeit einer ELD durch Änderung der Frequenz der Versorgungsspannung änderbar ist, ergibt sich eine einfache Möglichkeit für eine Kontrastanpassung.The tachometer supplies, for example, the desired data such as speed, mileage, tank content or similar data to the control device 20, which are prepared accordingly for the display ELD 6 so that they can be displayed. The input 21 can, however, also be connected to a navigation system, so that the street maps or directions can also be recorded and then displayed. The light sensor 10 is, for example, a phototransistor, which emits a voltage signal to the control device 20 depending on the ambient light. If the ambient brightness is high, the brightness of the ELD 6 is increased, while it is reduced, for example, in the dark. The brightness controller 23 controls, for example, the frequency of the supply voltage U for the ELD 6. Since the brightness of an ELD can be changed by changing the frequency of the supply voltage, there is a simple possibility for a contrast adjustment.

Die Steuervorrichtung 20 enthält dem Fachmann bekannte Baugruppen wie Decoder, Speicher, Treiberstufen, die zur Ansteuerung der ELD 6 benötigt werden. Die Baugruppen sind handelsüblich, so daß sich eine ausführliche Beschreibung erübrigt.The control device 20 contains assemblies known to those skilled in the art, such as decoders, memories, driver stages, which are required to control the ELD 6. The modules are commercially available, so that a detailed description is not necessary.

In Figur 2 sind nur jeweils zwei Elektrodenpaare aus ύbersichtlich- keitsgründen dargestellt. Die Anzahl der Elektroden 30, 31 ist be¬ liebig wählbar und von der Punktzahl der anzusteuernden Matrix ab¬ hängig. Ebenso kann eine Anzeige mit diskreten Bildelementen ausge¬ stattet sein (z. B. 7-Segmentlayout) .In FIG. 2 only two pairs of electrodes are shown for reasons of clarity. The number of electrodes 30, 31 is arbitrarily selectable and depends on the number of points of the matrix to be controlled. A display can also be equipped with discrete picture elements (eg 7-segment layout).

Sowohl der Lichtsensor 10 als auch der Helligkeitsregler 23 wirken auf einen Freguenzregelbaustein der Steuervorrichtung 20, mit dem die Helligkeit der ELD 6 steuerbar ist. In weiterer Ausgestaltung der Erfindung ist vorgesehen, eine ent¬ sprechende ELD 6 in die Heckscheibe eines Fahrzeuges einzusetzen. Die Anzeige kann dann insbesondere Warnfunktionen darstellen wie 'Stop', 'Vorsicht', 'Achtung', entsprechende Blinksymbole für Links- bzw. Rechtsabbiegen usw. Vorteilhaft ist die Ausbildung der anzusteuernden Elektroden 30, 31 als alphanumerische Zeichen und Ziffern oder auch als Pfeilsymbol, um Fahrtrichtungen anzuzeigen.Both the light sensor 10 and the brightness controller 23 act on a frequency control module of the control device 20, with which the brightness of the ELD 6 can be controlled. In a further embodiment of the invention, it is provided to use a corresponding ELD 6 in the rear window of a vehicle. The display can then in particular depict warning functions such as 'stop', 'caution', 'caution', corresponding blinking symbols for turning left or right, etc. It is advantageous to design the electrodes 30, 31 to be controlled as alphanumeric characters and numbers or as an arrow symbol, to show driving directions.

In Verbindung mit einem Abstandsmeßsystem erscheint weiterhin vor¬ teilhaft, daß bei einem zu dichten Auffahren eines nachfolgenden Fahrzeuges beispielsweise ein Warnzeichen 'Bitte Abstand halten' eingeschaltet wird. Daher kann die Anzeige vorteilhaft auch zur Er¬ höhung der Verkehrssicherheit beitragen. In connection with a distance measuring system, it also appears advantageous that, for example, a warning sign 'Please keep your distance' is switched on if a following vehicle is opened too tightly. The display can therefore advantageously also contribute to increasing traffic safety.

Claims

Ansprüche Expectations 1. Opto-elektronische Einrichtung zur Anzeige von Informationen an wenigstens einem Teil einer transparenten Scheibe, insbesondere im Bereich einer Fahrzeugscheibe, dadurch gekennzeichnet, daß die opto-elektronische Einrichtung eine Elektrolumineszenz-Anzeige (ELD) (6) ist.1. Opto-electronic device for displaying information on at least part of a transparent pane, in particular in the area of a vehicle window, characterized in that the opto-electronic device is an electroluminescent display (ELD) (6). 2. Opto-elektronische Einrichtung nach Anspruch 1, dadurch gekenn¬ zeichnet, daß die Elektrolumineszenz-Anzeige (6) eine Wechselspan- nungs-Dünnfilm-Elektrolumineszenz-Anzeige (ACTFEL) ist.2. Opto-electronic device according to claim 1, characterized gekenn¬ characterized in that the electroluminescent display (6) is an alternating voltage thin-film electroluminescent display (ACTFEL). 3. Opto-elektronische Einrichtung nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, daß die Elektrolumineszenz-Anzeige (6) in einer Zwischenschicht der Fahrzeugscheibe (4) angeordnet ist.3. Optoelectronic device according to one of the preceding claims, characterized in that the electroluminescent display (6) is arranged in an intermediate layer of the vehicle window (4). 4. Opto-elektronische Einrichtung nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, daß die Elektrolumineszenz-Anzeige (6) eine Matrixstruktur aufweist, deren Matrixpunkte über Dünn¬ schicht-Leitungen (8) ansteuerbar sind. 4. Opto-electronic device according to one of the preceding claims, characterized in that the electroluminescent display (6) has a matrix structure, the matrix points of which can be controlled via thin-film lines (8). 5. Opto-elektronische Einrichtung nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, daß die von der Elektrolu¬ mineszenz-Anzeige (6) dargestellten Informationen farbig sind.5. Opto-electronic device according to claims one of the preceding ¬, characterized in that the information represented by the Elektrolu¬ mineszenz indicator (6) are colored. 6. Opto-elektronische Einrichtung nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, daß die Helligkeit der Elektrolu¬ mineszenz-Anzeige (6) in Abhängigkeit vom Umgebungslicht der Fahr¬ zeugscheibe (4) regelbar ist.6. Opto-electronic device according to one of the preceding claims, characterized in that the brightness of the electroluminescent display (6) can be regulated as a function of the ambient light of the vehicle window (4). 7. Opto-elektronische Einrichtung nach Anspruch 6, dadurch ge¬ kennzeichnet, daß die Helligkeit durch Änderung der Frequenz der An¬ steuerung regelbar ist.7. Optoelectronic device according to claim 6, characterized in that the brightness can be regulated by changing the frequency of the control. 8. Opto-elektronische Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Elektrolumineszenz-An¬ zeige (6) an der Frontscheibe eines Kraftfahrzeuges im primären Sichtfeld (5) des Fahrers angeordnet ist.8. Optoelectronic device according to one of the preceding claims, characterized in that the electroluminescent display (6) is arranged on the windshield of a motor vehicle in the primary field of vision (5) of the driver. 9. Opto-elektronische Einrichtung nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, daß die Elektrolumineszenz-Anzeige (6) an der Heckscheibe des Kraftfahrzeuges angeordnet ist.9. Opto-electronic device according to one of the preceding claims, characterized in that the electroluminescent display (6) is arranged on the rear window of the motor vehicle. 10. Opto-elektronische Einrichtung nach Anspruch 9, dadurch gekenn¬ zeichnet, daß die Elektrolumineszenz-Anzeige (6) vorzugsweise eine Warninformation anzeigt, die bei Betätigung der Bremse und/oder des Blinkgebers erscheint.10. Opto-electronic device according to claim 9, characterized gekenn¬ characterized in that the electroluminescent display (6) preferably displays warning information that appears when the brake and / or the flasher unit is actuated. 11. Opto-elektronische Einrichtung nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, daß auf der Innenseite der Fahr¬ zeugscheibe im Anzeigebereich der Elektrolumineszenz-Anzeige 6 ein Polarisationsfilter (11) angeordnet ist. 11. Opto-electronic device according to one of the preceding claims, characterized in that a polarization filter (11) is arranged on the inside of the vehicle window in the display area of the electroluminescent display 6. 12. Opto-elektronische Einrichtung nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, daß die Elektroden (30, 31) als alphanumerisches Zeichen und/oder Symbol ausgebildet sind. 12. Opto-electronic device according to one of the preceding claims, characterized in that the electrodes (30, 31) are designed as alphanumeric characters and / or symbols.
PCT/DE1992/000621 1991-08-21 1992-07-29 Electroluminescent display Ceased WO1993004568A1 (en)

Priority Applications (1)

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DE4127656A DE4127656A1 (en) 1991-08-21 1991-08-21 ELECTROLUMINESCENCE DISPLAY
DEP4127656.6 1991-08-21

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JPH06509999A (en) 1994-11-10

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