EP1733596A2 - Electroluminescent display - Google Patents

Electroluminescent display

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Publication number
EP1733596A2
EP1733596A2 EP05716528A EP05716528A EP1733596A2 EP 1733596 A2 EP1733596 A2 EP 1733596A2 EP 05716528 A EP05716528 A EP 05716528A EP 05716528 A EP05716528 A EP 05716528A EP 1733596 A2 EP1733596 A2 EP 1733596A2
Authority
EP
European Patent Office
Prior art keywords
layer
electroluminescent display
transparent
display according
electrode layer
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.)
Granted
Application number
EP05716528A
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German (de)
French (fr)
Other versions
EP1733596B1 (en
Inventor
Manfred Hartmann
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.)
Schreiner Group GmbH and Co KG
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Schreiner Group GmbH and Co KG
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Application filed by Schreiner Group GmbH and Co KG filed Critical Schreiner Group GmbH and Co KG
Publication of EP1733596A2 publication Critical patent/EP1733596A2/en
Application granted granted Critical
Publication of EP1733596B1 publication Critical patent/EP1733596B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Definitions

  • the present invention relates to an electroluminescent display.
  • An electroluminescent display is understood to mean a flat body which, at least in part, has at least one electroluminophores embedded in a binder matrix, i.e. by means of excitation by means of an electric (alternating) field has luminous substances containing a luminous layer.
  • EL displays are used in particular as advertising signs with illuminated picture areas.
  • there are numerous other applications such as display boards, displays, decorative elements, lighting fixtures, etc.
  • the electroluminophores or luminescent pigments are embedded in a transparent, organic or ceramic binder.
  • the starting materials are mostly zinc sulfides, which generate different, relatively narrow-band emission spectra depending on the doping or co-doping and the preparation process. The focus of the spectrum determines the respective color of the emitted light.
  • transparent is understood as the opposite of opaque, ie as recognizable translucent or noticeably transparent in the general sense of speech. In this sense, transparency does not require almost 100% light transmission. A light transmission of 15% is also still considered to be transparent. On the other hand, only a slight light permeability, ie a degree of transmission that only allows light sources to shimmer weakly, is no longer understood to be transparent.
  • the exciting AC voltage field generally has a frequency of a few hundred Hertz, the effective value of the operating voltage often being in a range from approximately 50 to 150 volts. By increasing the voltage, a higher luminance can generally be achieved, which is usually in a range from approximately 50 to approximately 200 candelas per square meter. Increasing the frequency usually causes a color shift towards lower wavelengths. However, both parameters must be coordinated to achieve a desired lighting impression.
  • the alternating field is applied over thin surface electrodes which are arranged on both sides of the luminescent layer and are at least transparent on the visible side.
  • the luminescent layers of EL displays are usually designed as a larger number of non-contiguous partial areas, which each serve as display segments and / or picture elements.
  • the individual display segments and / or picture elements can be designed in different colors and in a wide variety of shapes and are generally referred to below as "partial picture areas".
  • at least one of the electrode layers is only implemented in the area of the partial image areas, in particular, however, when partial image areas are to be individually controllable, for example for running image-like effects, flashing effects, changing display texts, etc.
  • Conventional EL displays in particular EL displays used as advertising signs or display boards, generally have a structure comprising two glass or plastic panes with a conductive coating, the luminous capacitors being arranged between the panes and being contacted at the rear, for example via carbon conductive rubbers.
  • the rear contact layer which preferably consists of transparent conductive lacquer, permits contacting of the jerk electrode layer, which preferably contains silver or carbon, in the area of the image area without visible conductor tracks.
  • the contact layer preferably touches the jerk electrode layer directly in the region of the recess or recesses of the insulation layer, i.e. without intermediate layer. Is the image area divided into several non-contiguous partial image areas, e.g. Subdivided display segments, letters, etc., the contact layer can be divided into contact areas separated from one another by narrow interruptions in order to enable separate electrical control and thus independent illumination of the partial image areas.
  • the transparent conductive lacquer can be, for example, (doped) polythiophene, which is available, for example, under the trade name Orgacon (registered trademark of the Agfa-Gevaert group). Transparency is understood as defined above.
  • transparent layers according to the present invention preferably allow light transmission of at least 25%, particularly preferably over 40%, ideally over 60%.
  • the carrier is preferably a glass or plastic glass pane, which can be made transparent or partially transparent.
  • Partially transparent is understood to mean both regionally transparent carriers and non-transparent yet nevertheless noticeably translucent carriers (for example made of frosted glass or sandblasted glass).
  • a wide range of mineral and organic glasses is suitable, in addition to ordinary or hardened window glass, for example acrylic glass (PMMA) or polycarbonate glass.
  • the carrier is preferably the only supporting layer consisting predominantly of glass or plastic glass in the structure of the EL display; In this context, multilayer safety glass is considered as one layer.
  • layers can in particular also be conceived as a load-bearing layer which have a certain minimum bending stiffness, for example a bending stiffness according to DIN -53 1 21 of more than 100 mNm (longitudinal).
  • a luminescent layer with acrylate binder artificial glass-like formation of the matrix in which the luninophores are embedded
  • the absence of a second supporting gas or synthetic glass layer means that the construction contrary to the prior art does not Beingge Mége Mége Méten au ⁇ f two but only on a conductively coated disc is built. In this way, considerable weight savings can be achieved compared to known EL displays, and the thickness of the overall structure is also reduced.
  • the insulation layer is preferably thinner than a millimeter.
  • the insulation layer is preferably made of plastic.
  • the electrode layer resting on the carrier or, if appropriate, an intermediate layer is preferably also made of transparent conductive lacquer.
  • another transparent, conductive coating of the carrier is also conceivable, for example sputtering with indium tin oxide (Indium " Tin Oxide, ITO). Suitable glasses coated with tin oxide are commercially available at relatively low prices
  • the voltage supply of the contact layer and the electrode layer can take place via so-called bus bars. These are bordering or (partially) bordering, highly conductive structures made of silver and / or copper and / or carbon pastes or the like.
  • the back of the EL display is preferably insulated with a back insulation layer, which can advantageously consist of a thin plastic film, a non-conductive lacquer or the like. If both this and the insulation layer arranged on the side of the contact layer facing the carrier are made transparent, then there is an EL display which is transparent outside the image area and in which, due to the transparency of the contact layer, no electrical line elements interfere with the visual impression (possibly provided Bus bars can be found on Edge of the EL display can be provided and therefore covered by means of a frame or a clamping device or a narrow, visible-side, bordering, opaque cover). Possibly. Suitable recesses for contacting the bus bars must be provided in the provided insulation or back insulation layer.
  • FIG. 1 shows a perspective view of a section through part of an EL display according to the invention. For reasons of clarity, the layer thicknesses have been greatly increased and, in the manner of an exploded drawing, gaps between adjacent layers are shown.
  • FIG. 2a-2e show different layers of an EL display according to the invention, constructed similarly to FIG. 1, in the rear view, i.e. Cuts parallel to the image plane of the EL display.
  • the figures can also be understood as representations of various stages in the manufacture of the EL display
  • Fig. 1 and Fig. 2a-e show a largely identical layer structure, so that the same reference numerals are used for corresponding components.
  • the figures can be viewed in parallel, the layer structure in FIG. 1 being explained from bottom to top and thus in the production sequence of the individual layers.
  • the visible side that is to say the side facing the intended viewer, is shown at the bottom in FIG. 1 and the rear side at the top.
  • the electrode layer 2 made of transparent conductive varnish is applied to a carrier 1 made of mineral or plastic glass (FIG. 2a).
  • the luminous layer 3 is arranged thereon within the contours which are intended to form the image surface, which is a transparent matrix 5 in which the electroluminophores 4 are embedded.
  • the layer 3 can be designed as a cast or extruded film, but also as a screen printing layer or the like.
  • the representation of the electroluminophores 4 is to be understood purely schematically. In practice, efforts are made to obtain particles that approximate the spherical shape.
  • Electroluminophores are usually sensitive to the effects of moisture. Therefore, additional layers can be integrated, which take over the function of a moisture barrier or vapor barrier. However, these can largely be dispensed with, in particular, if microencapsulated electroluminophores 4 are used.
  • the microencapsulation is usually oxidic or nitridic, however, for example, an organic microencapsulation or a diamond-like carbon encapsulation ("diamond-like carbon”) is also conceivable.
  • the luminescent layer 3 can be divided into a plurality of discrete subareas 3a, 3b, as shown in FIG. 2b, which each represent individual picture elements, display segments, symbols, characters (in the present case in the form of the letters L and T).
  • a thin additional dielectric layer 6 can advantageously be provided on the back of the luminescent layer 3.
  • the silver-containing jerk electrode layer 7, which in principle can also be designed differently, extends within the contours of the luminous layer 3 or its discrete partial areas 3a, 3b over an area which is approximately as large as the area of the luminous layer 3 or its discrete partial areas 3a, 3b, however, leaves a narrow edge area 8 of the latter or the dielectric layer 6 free in order to largely rule out a risk of breakdown (in cooperation with the electrode layer 2).
  • the next layer in the structure is a transparent insulation layer 9, preferably made of a plastic material, which has cutouts 10 in the area of the jerk electrode layer 7 and in a narrow edge area 11 of the electrode layer 2, in order to enable them to be contacted from the rear for the voltage feed ,
  • the contacting of the jerk electrode layer 7 through the cutouts 10 of the insulation layer 9 takes place via the contact layer 1 2 made of transparent conductive lacquer, which is carried out almost over the full area, but does not quite reach the narrow edge area 11 for contacting the electrode layer 2 in order to exclude short circuits.
  • the contact is advantageously made directly, ie without additional layers between contact layer 1 2 and jerk electrode layer 7.
  • bus bars 1 3a, 13b which can be printed, for example, from conductive silver paste and, in the present case, from aesthetic ones Aspects are not all-round. In the case of very large-area EL displays, however, bus bars that run almost completely around can be advantageous in order to achieve a uniform luminance and to avoid local heating.
  • the back of the EL display is insulated with the transparent back insulation layer 14, which preferably consists of a plastic material.
  • the EL displays according to the invention can also have additional, non-luminous image components or image elements backlit by means of the luminous layer 3, for example in the form of prints, glass etching etc.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

An electrode layer (2) formed by a transparent conductive varnish is applied to a mineral or plastic glass carrier. Afterwards, a luminescent layer (3) formed by a transparent matrix (5) provided with electroluminophors (4) incorporated therein is disposed within contours defining an image surface. Said luminescent layer (3) is dividable into several discrete partial areas. A rear silver-containing electrode layer (7) extends within the a luminescent layer (3) contours above a surface whose size is approximately equal to the size of the luminescent layer (3) but leaves a narrow edge area (8) thereof free. The structure also comprises an insulating transparent layer (9) provided with recesses (10) in the area of the rear electrode layer (7) in order to bring it into contact for voltage supply from a rear face. Said rear electrode layer (7) is brought into contact through the recesses (10) of the insulating layer (9) by means of a transparent conductive varnish contact layer (12). The inventive electroluminescent display is insulated on the rear face thereof by a rear transparent insulating layer (14).

Description

ELEKTROLUMINESZENZDISPLAY electroluminescent display
Die vorliegende Erfindung betrifft ein Elektrolumineszenzdisplay.The present invention relates to an electroluminescent display.
Unter einem Elektrolumineszenzdisplay (kurz EL-Display) wird ein flacher Körper verstanden, welcher zumindest teilflächig mindestens eine in eine Bindermatrix eingelagerte Elektroluminophoren, d.h. durch Anregung mittels eines elektrischen (Wechsel-)Feldes leuchtende Stoffe, enthaltende Leuchtschicht aufweist. EL-Displays werden insbesondere als Werbeschilder mit leuchtenden Bildflächen eingesetzt. Darüber hinaus existiert eine Vielzahl weiterer Anwendungen als Schautafeln, Anzeigen, Dekorelemente, Beleuchtungskörper etc.An electroluminescent display (EL display for short) is understood to mean a flat body which, at least in part, has at least one electroluminophores embedded in a binder matrix, i.e. by means of excitation by means of an electric (alternating) field has luminous substances containing a luminous layer. EL displays are used in particular as advertising signs with illuminated picture areas. In addition, there are numerous other applications such as display boards, displays, decorative elements, lighting fixtures, etc.
Die Elektroluminophore bzw. Leuchtpigmente sind in ein transparentes, organisches oder keramischen Bindemittel eingebettet. Ausgangsstoffe sind meist Zinksulfide, welche in Abhängigkeit von Dotierung bzw. Co-Dotierung und Präparationsvorgang unterschiedliche, relativ schmalbandige Emissionsspektren erzeugen. Der Schwerpunkt des Spektrums bestimmt die jeweilige Farbe des emittierten Lichtes.The electroluminophores or luminescent pigments are embedded in a transparent, organic or ceramic binder. The starting materials are mostly zinc sulfides, which generate different, relatively narrow-band emission spectra depending on the doping or co-doping and the preparation process. The focus of the spectrum determines the respective color of the emitted light.
Transparent wird im Zusammenhang mit der vorliegenden Anmeldung als das Gegenteil von opak verstanden, d.h. als erkennbar lichtdurchlässig bzw. merklich durchsichtig im allgemeinen Sprachsinn. Transparenz in diesem Sinne erfordert also keine Lichttransmission von nahezu 100%. Auch eine Lichttransmission von 1 5% wird noch als transparent aufgefaßt. Eine nur geringfügige Lichtdurchlässigkeit, d.h. ein Transmissionsgrad der lediglich das schwache Durchschimmern von Lichtquellen erlaubt, wird dagegen nicht mehr als transparent verstanden. Das anregende Wechselspannungsfeld besitzt in der Regel eine Frequenz von einigen hundert Hertz, wobei der Effektivwert der Betriebsspannung häufig in einem Bereich von etwa 50 bis 1 50 Volt liegt. Durch Erhöhung der Spannung läßt sich in aller Regel eine höhere Leuchtdichte erzielen, welche üblicherweise in einem Bereich von ungefähr 50 bis etwa 200 Candela pro Quadratmeter liegt. Eine Frequenzerhöhung bewirkt in der Regel eine Farbverschiebung hin zu niedrigeren Wellenlängen. Beide Parameter müssen jedoch aufeinander abgestimmt werden, um einen gewünschten Leuchteindruck zu erzielen.In connection with the present application, transparent is understood as the opposite of opaque, ie as recognizable translucent or noticeably transparent in the general sense of speech. In this sense, transparency does not require almost 100% light transmission. A light transmission of 15% is also still considered to be transparent. On the other hand, only a slight light permeability, ie a degree of transmission that only allows light sources to shimmer weakly, is no longer understood to be transparent. The exciting AC voltage field generally has a frequency of a few hundred Hertz, the effective value of the operating voltage often being in a range from approximately 50 to 150 volts. By increasing the voltage, a higher luminance can generally be achieved, which is usually in a range from approximately 50 to approximately 200 candelas per square meter. Increasing the frequency usually causes a color shift towards lower wavelengths. However, both parameters must be coordinated to achieve a desired lighting impression.
Das Wechselfeld wird dabei über dünne, zu beiden Seiten der Leuchtschicht angeordnete, zumindest sichtseitig transparent ausgeführte Flächenelektroden angelegt. Die Elektrodenschichten bilden zusammen mit der Leuchtschicht und gegebenenfalls zusätzlichen Dielektrikumsschichten und/oder farbfilternden bzw. farb- konvertierenden Schichten einen flächigen Leuchtkondensator.The alternating field is applied over thin surface electrodes which are arranged on both sides of the luminescent layer and are at least transparent on the visible side. The electrode layers, together with the luminescent layer and possibly additional dielectric layers and / or color-filtering or color-converting layers, form a flat luminous capacitor.
Aus praktischen und gestalterischen Gründen sind die Leuchtschichten von EL-Displays meist als größere Anzahl nicht-zusammenhängender Teilflächen ausgeführt, welche jeweils als Anzeigesegmente und/oder Bildelemente dienen. Die einzelnen Anzeigesegmente und/oder Bildelemente können in verschiedenfarbig und in unterschiedlichsten Formen ausgebildet sein und werden nachfolgend allgemein als "Teilbildflächen" bezeichnet. Meist ist auch zumindest eine der Elektrodenschichten nur im Bereich der Teilbildflächen ausgeführt, insbesondere jedoch dann, wenn Teilbildflächen einzeln ansteuerbar sein sollen, beispielsweise für lauf bildartige Effekte, Biinkeffekte, wechselnde Anzeigetexte etc.For practical and design reasons, the luminescent layers of EL displays are usually designed as a larger number of non-contiguous partial areas, which each serve as display segments and / or picture elements. The individual display segments and / or picture elements can be designed in different colors and in a wide variety of shapes and are generally referred to below as "partial picture areas". Most of the time, at least one of the electrode layers is only implemented in the area of the partial image areas, in particular, however, when partial image areas are to be individually controllable, for example for running image-like effects, flashing effects, changing display texts, etc.
Herkömmliche EL-Displays, insbesondere als Werbeschilder oder Schautafeln eingesetzte EL-Displays, besitzen in der Regel einen zwei leitfähig beschichtete Glasoder Kunststoffscheiben umfassenden Aufbau, wobei zwischen den Scheiben die Leuchtkondensatoren angeordnet sind, welche rückwärtig beispielsweise über Carbon- Leitgummis kontaktiert werden.Conventional EL displays, in particular EL displays used as advertising signs or display boards, generally have a structure comprising two glass or plastic panes with a conductive coating, the luminous capacitors being arranged between the panes and being contacted at the rear, for example via carbon conductive rubbers.
Insbesondere großflächige Displays sind relativ aufwendig herzustellen, da in der Fertigung mit zwei weitgehend starren Scheiben hantiert werden muß. Durch die beiden Scheiben ist auch das Gewicht der fertigen Displays beträchtlich. Vor diesem Hintergrund ist es Aufgabe der vorliegenden Erfindung, ein EL-Display zu schaffen, welches sich auch als einscheibiger Aufbau umsetzen läßt, ohne in Funktion und Erscheinungsbild gegenüber herkömmlichen EL-Displays einzubüßen. Ferner soll das EL-Display einfach zu fertigen und im Betrieb zuverlässig sein. Nicht zuletzt wird eine hochwertige Anmutung angestrebt, d.h. zur eigentlichen Informationsdarstellung bzw. dekorativen Wirkung nicht beitragende Elemente, wie z.B. Leiterbahnen und dgl., sollen möglichst unauffällig ausführbar sein.Large-area displays in particular are relatively expensive to manufacture, since two largely rigid panes have to be used in production. The weight of the finished displays is also considerable due to the two panes. Against this background, it is an object of the present invention to provide an EL display which can also be implemented as a single-pane structure without losing its function and appearance compared to conventional EL displays. Furthermore, the EL display should be easy to manufacture and reliable in operation. Last but not least, a high-quality appearance is sought, ie elements that do not contribute to the actual information display or decorative effect, such as, for example, conductor tracks and the like, should be able to be implemented as inconspicuously as possible.
Diese Aufgabe wird durch ein Elektrolumineszenzdisplay gemäß Patentanspruch 1 gelöst. Vorteilhafte Ausführungsformen können gemäß einem der Ansprüche 2-1 3 gestaltet sein.This object is achieved by an electroluminescent display according to claim 1. Advantageous embodiments can be designed according to one of claims 2-1 3.
Die rückwärtige vorzugsweise aus transparentem Leitlack bestehende Kontaktschicht gestattet die Kontaktierung der vorzugsweise silber- oder carbonhaltigen Ruckelektrodenschicht im Bereich der Bildfläche ohne sichtbare Leiterbahnen. Vorzugsweise berührt die Kontaktschicht die Ruckelektrodenschicht im Bereich der Aussparung bzw. Aussparungen der Isolationsschicht direkt, d.h. ohne Zwischenschicht. Ist die Bildfläche in mehrere nichtzusammenhängende Teilbildflächen, z.B. Anzeigensegmente, Buchstaben etc. unterteilt, so kann die Kontaktschicht in durch schmale Unterbrechungen voneinander getrennte Kontaktbereiche gegliedert sein, um die separate elektrische Ansteuerung und somit voneinander unabhängige Beleuchtung der Teilbildflächen zu ermöglichen. Bei dem transparenten Leitlack kann es sich beispielsweise um (dotiertes) Polythiophen handeln, welches beispielsweise unter der Handelsbezeichnung Orgacon (eingetragene Marke der Agfa-Gevaert Gruppe) erhältlich ist. Transparenz wird verstanden wie oben definiert. Vorzugsweise erlauben jedoch transparente Schichten gemäß vorliegender Erfindung eine Lichttransmission von mindestens 25%, besonders bevorzugt über 40%, idealerweise über 60%.The rear contact layer, which preferably consists of transparent conductive lacquer, permits contacting of the jerk electrode layer, which preferably contains silver or carbon, in the area of the image area without visible conductor tracks. The contact layer preferably touches the jerk electrode layer directly in the region of the recess or recesses of the insulation layer, i.e. without intermediate layer. Is the image area divided into several non-contiguous partial image areas, e.g. Subdivided display segments, letters, etc., the contact layer can be divided into contact areas separated from one another by narrow interruptions in order to enable separate electrical control and thus independent illumination of the partial image areas. The transparent conductive lacquer can be, for example, (doped) polythiophene, which is available, for example, under the trade name Orgacon (registered trademark of the Agfa-Gevaert group). Transparency is understood as defined above. However, transparent layers according to the present invention preferably allow light transmission of at least 25%, particularly preferably over 40%, ideally over 60%.
Bei dem Träger handelt es sich vorzugsweise um eine Glas- oder Kunststoffglasscheibe, welche transparent oder teiltransparent ausgeführt sein kann. Unter teiltransparent werden sowohl bereichsweise transparente Träger als auch nicht durchsichtige und dennoch merklich lichtdurchlässige Träger (z.B. aus Milchglas oder sandgestrahltem Glas) verstanden. Geeignet ist eine große Bandbreite an mineralischen und organischen Gläsern, neben gewöhnlichem oder gehärtetem Fensterglas beispielsweise Acrylglas (PMMA) oder Polycarbonatglas. Dabei ist der Träger vorzugsweise die einzige vorwiegend aus Glas oder Kunststoffglas bestehende tragende Schicht im Aufbau des EL- Displays; mehrlagiges Sicherheitsglas wird in diesem Zusammenhang als eine Schicht betrachtet. Als tragende Schicht können in diesem Zusammenhang insbesondere auch Schichten aufgefaßt werden, welche eine gewisse Mindestbiegesteifigkeit, beispielsweise eine Biegesteifigkeit nach DIN -53 1 21 von über 1 00 mNm (längs), aufweisen. Nicht als tragende Kunststoffgissschicht aufgefaßt wird in diesem Zusammenhang eine Leuchtschicht mit Acrylat- Binder (kunstglasartige Ausbildung der Matrix, in welche die Luninophoren eingelagert sind). Vielmehr bedeutet der Verzicht auf eine zweite tragende Gas- bzw. Kunstglasschicht, daß der Aufbau entgegen dem obengeschilderten Stand der Technik nicht au~f zwei sondern nur auf einer leitfähig beschichteten Scheibe aufbaut. Hierdurch lassen sich gegenüber bekannten EL-Displays erhebliche Gewichtseinsparungen erzielen, ferner reduziert sich auch die Dicke des Gesamtaufbaus. Zum gleichen Zweck ist die Isolationsschicht vorzugsweise dünner als ein Millimeter. Ferner besteht die Isolationsschicht vorzugsweise aus Kunststoff.The carrier is preferably a glass or plastic glass pane, which can be made transparent or partially transparent. Partially transparent is understood to mean both regionally transparent carriers and non-transparent yet nevertheless noticeably translucent carriers (for example made of frosted glass or sandblasted glass). A wide range of mineral and organic glasses is suitable, in addition to ordinary or hardened window glass, for example acrylic glass (PMMA) or polycarbonate glass. The carrier is preferably the only supporting layer consisting predominantly of glass or plastic glass in the structure of the EL display; In this context, multilayer safety glass is considered as one layer. In this context, layers can in particular also be conceived as a load-bearing layer which have a certain minimum bending stiffness, for example a bending stiffness according to DIN -53 1 21 of more than 100 mNm (longitudinal). In this context, a luminescent layer with acrylate binder (artificial glass-like formation of the matrix in which the luninophores are embedded) is not to be regarded as a load-bearing plastic casting layer. Rather, the absence of a second supporting gas or synthetic glass layer means that the construction contrary to the prior art does not obengeschilderten au ~ f two but only on a conductively coated disc is built. In this way, considerable weight savings can be achieved compared to known EL displays, and the thickness of the overall structure is also reduced. For the same purpose, the insulation layer is preferably thinner than a millimeter. Furthermore, the insulation layer is preferably made of plastic.
Die auf dem Träger oder ggf. einer Zwischenschicht aufliegende Elektrodenschicht ist vorzugsweise ebenfalls aus transparentem Leitlack ausgeführt. Denkbar ist jedoch auch eine anderweitige transparente, leitende Beschichtung des Trägers, beispielsweise eine Besputterung mit Indium-Zinn-Oxid (Indium "Tin Oxide, ITO). Geeignete Zinnoxid- beschichtete Gläser sind zu reltiv geringen Preisen kommerziell erhältlichThe electrode layer resting on the carrier or, if appropriate, an intermediate layer is preferably also made of transparent conductive lacquer. However, another transparent, conductive coating of the carrier is also conceivable, for example sputtering with indium tin oxide (Indium " Tin Oxide, ITO). Suitable glasses coated with tin oxide are commercially available at relatively low prices
Die Spannungseinspeisung der Kontaktschicht sowie der Elektrodenschicht kann über sogenannte Bus-Bars erfolgen. Dabei handelt es sich um berandende bzw. (teiweise) umrandende, gut leitende Strukturen aus Silber- und/oder Kuper- und/oder Carbonpasten oder dergleichen.The voltage supply of the contact layer and the electrode layer can take place via so-called bus bars. These are bordering or (partially) bordering, highly conductive structures made of silver and / or copper and / or carbon pastes or the like.
Rückseitig ist das EL-Display vorzugsweise mit einer Rückisolationsschicht isoliert, welche vorteilhafterweise aus einer dünnen Kunststoffolie, einem nichtleitenden Lack oder dgl. bestehen kann. Werden sowohl diese als auch die auf der dem Träger zugewandten Seite der Kontaktschicht angeordnete Isolationsschicht transparent ausgeführt, so liegt ein außerhalb der Bildfläc hen transparentes EL-Display vor, bei welchem aufgrund der Transparenz der Kontaktschicht keine elektrischen Leitungselemente den visuellen Eindruck stören (ggf. vorgesehene Bus-Bars können am Rand des EL-Displays vorgesehen sein und daher mittels eines Rahmens bzw. einer Einspannvorrichtung oder einer schmalen, sichtseitigen, umrandenden, opaken Abdeckung verdeckt werden). Ggf. sind in den vorgesehenen Isolations- bzw. Rückisolationsschicht geeignete Aussparungen zur Kontaktierung der Bus-Bars vorzusehen.The back of the EL display is preferably insulated with a back insulation layer, which can advantageously consist of a thin plastic film, a non-conductive lacquer or the like. If both this and the insulation layer arranged on the side of the contact layer facing the carrier are made transparent, then there is an EL display which is transparent outside the image area and in which, due to the transparency of the contact layer, no electrical line elements interfere with the visual impression (possibly provided Bus bars can be found on Edge of the EL display can be provided and therefore covered by means of a frame or a clamping device or a narrow, visible-side, bordering, opaque cover). Possibly. Suitable recesses for contacting the bus bars must be provided in the provided insulation or back insulation layer.
Grundsätzlich kann jede im Rahmen der vorliegenden Anmeldung beschriebene bzw. angedeutete Variante der Erfindung besonders vorteilhaft sein, je nach wirtschaftlichen und technischen Bedingungen im Einzelfall. Soweit nichts gegenteiliges dargelegt ist, bzw. soweit grundsätzlich technisch realisierbar, sind einzelne Merkmale der beschriebenen Ausführungsformen austauschbar oder miteinander kombinierbar.In principle, each variant of the invention described or indicated in the context of the present application can be particularly advantageous, depending on the economic and technical conditions in the individual case. Unless stated otherwise, or as far as technically feasible, individual features of the described embodiments can be exchanged or combined with one another.
Anhand der zugehörigen Zeichnungen werden Beispiele bevorzugter Ausführungsformen der vorliegenden Erfindung näher erläutert. Die Zeichnungen sind dabei nicht maßstäblich und rein schematisch aufzufassen.Examples of preferred embodiments of the present invention are explained in more detail with reference to the accompanying drawings. The drawings are not to scale and are to be understood purely schematically.
Fig. 1 zeigt in perspektivischer Ansicht einen Schnitt durch einen Teil eines erfindungsgemäßen EL-Displays. Aus Anschaulichkeitsgründen sind die Schichtdicken stark vergrößert und nach Art einer Explosionszeichnung teilweise Lücken zwischen aneinandergrenzenden Lagen dargestellt.1 shows a perspective view of a section through part of an EL display according to the invention. For reasons of clarity, the layer thicknesses have been greatly increased and, in the manner of an exploded drawing, gaps between adjacent layers are shown.
Fig. 2a-2e zeigen verschiedene Lagen eines erfindungsgemäßen, ähnlich Fig. 1 aufgebauten EL-Displays in der Rückansicht, d.h. Schnitte parallel zur Bildebene des EL-Displays. Die Figuren können auch als Darstellungen verschiedener Stufen der Fertigung des EL-Displays aufgefaßt werden2a-2e show different layers of an EL display according to the invention, constructed similarly to FIG. 1, in the rear view, i.e. Cuts parallel to the image plane of the EL display. The figures can also be understood as representations of various stages in the manufacture of the EL display
Fig. 1 und Fig. 2a-e zeigen einen zueinander weitgehend identischen Schichtaufbau, so daß für einander entsprechende Bestandteile jeweils dieselben Bezugszeichen verwendet werden. Die Figuren können parallel betrachtet werden, wobei der Schichtaufbau in Fig. 1 von unten nach oben und somit in der Herstellungsreihenfolge der einzelnen Schichten erläutert wird. Die Sichtseite, d.h. die dem bestimmungsgemäßen Betrachter zugewandte Seite ist in Fig. 1 unten, die Rückseite oben dargestellt. Auf einen Träger 1 aus Mineral- oder Kunststoffglas ist die Elektrodenschicht 2 aus transparentem Leitlack aufgebracht (Fig. 2a). Hierauf ist innerhalb der Konturen, welche die Bildfläche ergeben sollen, die Leuchtschicht 3 angeordnet, wobei es sich um eine transparente Matrix 5 handelt, in welche die Elektroluminophoren 4 eingelagert sind. Die Schicht 3 kann als gegossene oder extrudierte Folie, aber auch als Siebdruckschicht oder dergleichen ausgeführt sein. Insbesondere die Darstellung der Elektroluminophore 4 ist rein schematisch aufzufassen. In der Praxis bemüht man sich um möglichst der Kugelform angenäherte Partikeln.Fig. 1 and Fig. 2a-e show a largely identical layer structure, so that the same reference numerals are used for corresponding components. The figures can be viewed in parallel, the layer structure in FIG. 1 being explained from bottom to top and thus in the production sequence of the individual layers. The visible side, that is to say the side facing the intended viewer, is shown at the bottom in FIG. 1 and the rear side at the top. The electrode layer 2 made of transparent conductive varnish is applied to a carrier 1 made of mineral or plastic glass (FIG. 2a). The luminous layer 3 is arranged thereon within the contours which are intended to form the image surface, which is a transparent matrix 5 in which the electroluminophores 4 are embedded. The layer 3 can be designed as a cast or extruded film, but also as a screen printing layer or the like. In particular, the representation of the electroluminophores 4 is to be understood purely schematically. In practice, efforts are made to obtain particles that approximate the spherical shape.
Elektroluminophore sind in der Regel empfindlich gegen Feuchtigkeitseinwirkung. Darum können zusätzliche Schichten integriert werden, welche die Funktion einer Feuchtigkeitssperre bzw. Dampfsperre übernehme n. Diese können jedoch insbesondere dann weitgehend entfallen, wenn mikroverkapselte Elektroluminophore 4 verwendet werden. Die Mikroverkapselung ist üblicherweise oxidisch oder nitridisch, allerdings ist beispielsweise auch eine organische Mikrov rkapselung oder eine diamantartige Carbonverkapselung ("diamond-like carbon") denkbar.Electroluminophores are usually sensitive to the effects of moisture. Therefore, additional layers can be integrated, which take over the function of a moisture barrier or vapor barrier. However, these can largely be dispensed with, in particular, if microencapsulated electroluminophores 4 are used. The microencapsulation is usually oxidic or nitridic, however, for example, an organic microencapsulation or a diamond-like carbon encapsulation ("diamond-like carbon") is also conceivable.
Die Leuchtschicht 3 kann in mehrere diskrete Teilbereiche 3a, 3b aufgeteilt sein, wie in Fig. 2b abgebildet, welche jeweils einzelne Bildelemente, Anzeigensegmente, Symbole, Zeichen (vorliegend in Form der Buchstaben L und T) darstellen. Auf der Rückseite der Leuchtschicht 3 kann vorteilhafterweise eine dünne zusätzliche Dielektrikumsschicht 6 vorgesehen sein. Die silberhaltige, prinzipiell aber auch anders ausführbare Ruckelektrodenschicht 7 erstreckt sich innerhalb der Konturen der Leuchtschicht 3 bzw. deren diskreter Teilbereiche 3a, 3b über eine Fläche, welche annähernd so groß ist wie die Fläche der Leuchtschicht 3 bzw. deren diskreter Teilbereiche 3a, 3b, jedoch einen schmalen Randbereich 8 der letzteren bzw. der Dielektrikumsschicht 6 freiläßt, um eine Durchschlaggefahr (im Zusammenwirken mit der Elektrodenschicht 2) weitestgehend auszuschließen.The luminescent layer 3 can be divided into a plurality of discrete subareas 3a, 3b, as shown in FIG. 2b, which each represent individual picture elements, display segments, symbols, characters (in the present case in the form of the letters L and T). A thin additional dielectric layer 6 can advantageously be provided on the back of the luminescent layer 3. The silver-containing jerk electrode layer 7, which in principle can also be designed differently, extends within the contours of the luminous layer 3 or its discrete partial areas 3a, 3b over an area which is approximately as large as the area of the luminous layer 3 or its discrete partial areas 3a, 3b, however, leaves a narrow edge area 8 of the latter or the dielectric layer 6 free in order to largely rule out a risk of breakdown (in cooperation with the electrode layer 2).
Als nächste Schicht im Aufbau ist eine transparente, vorzugsweise aus einem Kunststoffmaterial bestehende Isolationsschicht 9 vorgesehen, welche Aussparungen 10 im Bereich der Ruckelektrodenschicht 7 sowie in einem schmalen Randbereich 1 1 der Elektrodenschicht 2 aufweist, um deren Kontaktierung von der Rückseite her für die Spannungseinspeisung zu ermöglichen. Die Kontaktierung der Ruckelektrodenschicht 7 durch die Aussparungen 10 der Isolationsschicht 9 hindurch erfolgt über die Kontaktschicht 1 2 aus transparentem Leitlack, welche fast vollflächig ausgeführt ist, jedoch nicht ganz an den schmalen Randbereich 1 1 zur Kontaktierung der Elektrodenschicht 2 heranreicht, um Kurzschlüsse auszuschließen. Vorteilhafterweise erfolgt die Kontaktierung direkt, d.h. ohne zusätzliche Schichten zwischen Kontaktschicht 1 2 und Ruckelektrodenschicht 7. Die Spannungseinspeisung in die Kontaktschicht 1 2 und die Elektrodenschicht 2 erfolgt über Bus-Bars 1 3a, 13b, welche beispielsweise aus Silberleitpaste gedruckt sein können und vorliegend aus ästhetischen Gesichtspunkten nicht umlaufend ausgebildet sind. Bei sehr großflächigen EL-Displays können jedoch fast vollständig umlaufende Bus-Bars zur Erzielung einer gleichmäßigen Leuchdichte und zur Vermeidung lokaler Erwärmungen vorteilhaft sein.The next layer in the structure is a transparent insulation layer 9, preferably made of a plastic material, which has cutouts 10 in the area of the jerk electrode layer 7 and in a narrow edge area 11 of the electrode layer 2, in order to enable them to be contacted from the rear for the voltage feed , The contacting of the jerk electrode layer 7 through the cutouts 10 of the insulation layer 9 takes place via the contact layer 1 2 made of transparent conductive lacquer, which is carried out almost over the full area, but does not quite reach the narrow edge area 11 for contacting the electrode layer 2 in order to exclude short circuits. The contact is advantageously made directly, ie without additional layers between contact layer 1 2 and jerk electrode layer 7. The voltage is fed into contact layer 1 2 and electrode layer 2 via bus bars 1 3a, 13b, which can be printed, for example, from conductive silver paste and, in the present case, from aesthetic ones Aspects are not all-round. In the case of very large-area EL displays, however, bus bars that run almost completely around can be advantageous in order to achieve a uniform luminance and to avoid local heating.
Das EL-Display ist rückseitig mit der transparenten Rückisolationsschicht 14 isoliert, welche vorzugsweise aus einem Kunststoffmaterial besteht.The back of the EL display is insulated with the transparent back insulation layer 14, which preferably consists of a plastic material.
Selbstverständlich können erfindungsgemäße EL-Displays auch zusätzliche, nichtleuchtende bzw. mittels der Leuchtschicht 3 hinterleuchtete Bildbestandteile, beispielsweise in Form von Aufdrucken, Glasätzungen etc. aufweisen. Of course, the EL displays according to the invention can also have additional, non-luminous image components or image elements backlit by means of the luminous layer 3, for example in the form of prints, glass etching etc.

Claims

PATENTANSPRÜCHE
1 . Elektrolumineszenzdisplay, aufweisend einen zumindest teiltransparenten Träger (1 ), - eine auf dem Träger (1 ) angeordnete, transparente Elektrodenschicht (2), eine Elektroluminophoren (4) enthaltende Leuchtschicht (3), welche eine Bildfläche darstellt, eine Ruckelektrodenschicht (7) im Bereich eines Großteils der Bildfläche, eine Isolationsschicht (9) welche eine Aussparung (10) im Bereich der Ruckelektrodenschicht (7) aufweist, eine zumindest teilflächig auf der Isolationsschicht (9) angeordnete transparente Kontaktschicht (1 2) zur Kontaktierung der Ruckelektrodenschicht (7).1 . Electroluminescent display, comprising an at least partially transparent support (1), - a transparent electrode layer (2) arranged on the support (1), a luminous layer (3) containing electroluminophores (4), which represents an image area, a jerk electrode layer (7) in the area A large part of the image area, an insulation layer (9) which has a recess (10) in the area of the jerk electrode layer (7), a transparent contact layer (1 2) arranged at least partially on the insulation layer (9) for contacting the jerk electrode layer (7).
2. Elektrolumineszenzdisplay gemäß Anspruch 1 , wobei die Elektrodenschicht (2) aus transparentem Leitlack ausgeführt ist.2. Electroluminescent display according to claim 1, wherein the electrode layer (2) is made of transparent conductive lacquer.
3. Elektrolumineszenzdisplay gemäß einem der vorangehenden Ansprüche, wobei die Kontaktschicht (12) aus transparentem Leitlack ausgeführt ist3. Electroluminescent display according to one of the preceding claims, wherein the contact layer (12) is made of transparent conductive lacquer
4. Elektrolumineszenzdisplay gemäß einem der vorangehenden Ansprüche, wobei die Isolationsschicht (9) zumindest teiltransparent ausgeführt ist.4. Electroluminescent display according to one of the preceding claims, wherein the insulation layer (9) is at least partially transparent.
5. Elektrolumineszenzdisplay gemäß einem der vorangehenden Ansprüche, aufweisend eine Rückisolationsschicht (14) zur Isolierung der dem Träger (1 ) abgewandten Seite der Kontaktschicht (12). 5. Electroluminescent display according to one of the preceding claims, comprising a back insulation layer (14) for insulating the side of the contact layer (12) facing away from the carrier (1).
6. Elektrolumineszenzdisplay gemäß Anspruch 5, wobei die Rückisolationsschicht (14) zumindest teiltransparent ausgeführt ist.6. The electroluminescent display according to claim 5, wherein the back insulation layer (14) is at least partially transparent.
7. Elektrolumineszenzdisplay gemäß einem der vorangehenden Ansprüche, wobei der Träger (1 ) vorwiegend aus Glas oder Kunststoffglas besteht.7. Electroluminescent display according to one of the preceding claims, wherein the carrier (1) consists predominantly of glass or plastic glass.
8. Elektrolumineszenzdisplay gemäß Anspruch 7, wobei der Träger (1 ) die einzige vorwiegend aus Glas oder Kunststoffglas bestehende tragende Schicht des Elektrolumineszenzdisplays darstellt.8. The electroluminescent display according to claim 7, wherein the carrier (1) is the only supporting layer of the electroluminescent display consisting predominantly of glass or plastic glass.
9. Elektrolumineszenzdisplay gemäß einem der vorangehenden Ansprüche, wobei die Elektrodenschicht (2) und/oder die Kontaktschicht (1 2) jeweils mittels eines Bus-Bars (13a, 1 3b) kontaktiert ist.9. Electroluminescent display according to one of the preceding claims, wherein the electrode layer (2) and / or the contact layer (1 2) is in each case contacted by means of a bus bar (13a, 1 3b).
1 0. Elektrolumineszenzdisplay gemäß Anspruch 10, wobei der Bus-Bar (1 3a, 1 3b) unter Einbeziehung einer Leitpaste ausgeführt ist.1 0. Electroluminescent display according to claim 10, wherein the bus bar (1 3a, 1 3b) is designed with the inclusion of a conductive paste.
1 1 . Elektrolumineszenzdisplay gemäß einem der vorangehenden Ansprüche, wobei die Bildfläche in mehrere nicht-zusammenhängende Teilbildflächen unterteilt ist.1 1. Electroluminescent display according to one of the preceding claims, wherein the image area is divided into a plurality of non-contiguous partial image areas.
1 2. Elektrolumineszenzdisplay gemäß "Anspruch 1 1 , wobei die Teilbildflächen jeweils einzeln und/oder gruppenweise ansteuerbar sind.1 2. Electroluminescent display according to " Claim 1 1, wherein the partial image areas can be controlled individually and / or in groups.
1 3. Elektrolumineszenzdisplay gemäß einem der vorangehenden Ansprüche, wobei die Kontaktschicht (1 2) die Ruckelektrodenschicht (7) im Bereich der Aussparung (10) direkt berührt. 1 3. Electroluminescent display according to one of the preceding claims, wherein the contact layer (1 2) touches the jerk electrode layer (7) in the region of the recess (10) directly.
EP05716528A 2004-04-05 2005-04-04 Electroluminescent display Not-in-force EP1733596B1 (en)

Applications Claiming Priority (2)

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DE102004016709A DE102004016709A1 (en) 2004-04-05 2004-04-05 electroluminescent display
PCT/EP2005/003536 WO2005098891A2 (en) 2004-04-05 2005-04-04 Electroluminescent display

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AT (1) ATE394905T1 (en)
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DE102006034918A1 (en) 2006-07-28 2008-01-31 Electrolux Home Products Corporation N.V. Household oven and / or oven
EP3981591B1 (en) * 2020-10-12 2023-07-05 Huang Ming Light emitting glass structure

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ATE394905T1 (en) 2008-05-15
WO2005098891A2 (en) 2005-10-20
DE102004016709A1 (en) 2005-11-24
US7872416B2 (en) 2011-01-18
DE502005004002D1 (en) 2008-06-19

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