DE3113217A1 - Electroluminescent display and method for its manufacture - Google Patents

Electroluminescent display and method for its manufacture

Info

Publication number
DE3113217A1
DE3113217A1 DE19813113217 DE3113217A DE3113217A1 DE 3113217 A1 DE3113217 A1 DE 3113217A1 DE 19813113217 DE19813113217 DE 19813113217 DE 3113217 A DE3113217 A DE 3113217A DE 3113217 A1 DE3113217 A1 DE 3113217A1
Authority
DE
Germany
Prior art keywords
electroluminescent display
active layer
powder
organic compound
electroluminescent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19813113217
Other languages
German (de)
Inventor
Jürgen Dipl.-Phys. Dr. Pottharst
Erhard Dipl.-Phys. 7250 Leonberg Sailer
Roland 7000 Stuttgart Weiss
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Priority to DE19813113217 priority Critical patent/DE3113217A1/en
Publication of DE3113217A1 publication Critical patent/DE3113217A1/en
Withdrawn legal-status Critical Current

Links

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
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded

Abstract

In the case of an electroluminescent display, the powder of the active layer is embedded in an organic compound having a high dielectric constant, preferably poly(vinylidene fluoride). As a result, the brightness of the active layer in the electroluminescent display is increased. This makes it possible to reduce the excitation voltage.

Description

Elektrolumineszenz-Display und Verfahren zu dessenElectroluminescent display and method for it

Herstellung Die Erfindung betrifft ein Elektrolumineszenz-Display, bestehend aus zwei parallelen Platten, zwischen denen mittels eines elektrischen Wechselfeldes eine anregbare dielektri-sche Schicht eingeschlossen ist und auf deren Außenseiten Elektroden ange-ordnet- sind. Solche Elektrolumineszenz-Displays finden heute ihre technische Anwendung als Vertreter von aktiven Bildschirmen, z.B. in Anzeigeelementen bzw. Anzeigeanordnungen und Beleuchtungselementen.Production The invention relates to an electroluminescent display, consisting of two parallel plates between which by means of an electric Alternating field a stimulable dielectric layer is included and on their Outside electrodes are arranged. Find such electroluminescent displays today their technical application as a representative of active screens, e.g. in Display elements or display arrangements and lighting elements.

Bei derartigen Elektrolumineszenz-Displays ist bei ihrem Einsatz in der Praxis vor allem die gegebene Helligkeit von besonderer Andeutung. Äls aktive Schicht finden dabei heute dielektrische, lumineszierende Stoffe der verschiedensten Art Verwendung, so z.B. ZnS. Bei dem alleinigen Einsatz des dielektrischen, lumineszierenden Stoffes ist jedoch die Helligkeit der aktiven Schicht bisher nicht immer zufriedenstellend gewesen.In electroluminescent displays of this type, they are used in in practice, above all, the given brightness is particularly suggestive. As active Nowadays, dielectric, luminescent substances of the most varied are found in layers Type of use, e.g. ZnS. With the sole use of the dielectric, luminescent However, the brightness of the active layer has not always been satisfactory until now been.

Der Erfindung liegt daher die Aufgabe zugrunde, für ein Elektrolumineszenz-Display eine aktive Schicht zu schaffen, deren Helligkeit gegenüber den bisher bekannten aktiven Schichten verbessert ist.The invention is therefore based on the object for an electroluminescent display to create an active layer whose brightness compared to the previously known active layers is improved.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Pulver der aktiven Schicht in eine organische Verbindung mit hoher Dielektrizitätskonstante eingebettet wird.The object is achieved according to the invention in that the Powder of the active layer into an organic compound with a high dielectric constant is embedded.

als besonders vorteilhaft hat sich dabei eine Einbettung des aktiven Stoffes in Polyvinylidenfluorid als Grundstoff herausgestellt.Embedding the active one has proven to be particularly advantageous Pointed out substance in polyvinylidene fluoride as the base material.

Besonders gute Ergebnisse haben sich in Bezug auf die Helligkeit ergeben, wenn dabei als aktiver Stoff ein Zinksulfidpulver Verwendung findet.Particularly good results were obtained with regard to the brightness, if a zinc sulfide powder is used as the active substance.

Die Herstellung der erfindungsgemäßen Elektrolumineszenz-Displays geht dabei in der Weise vor sich, daß das Pulver der aktiven Schicht in den Grundstoff eingebracht wird, der gelöst oder in geschmolzener Form vorliegt.The production of the electroluminescent displays according to the invention takes place in such a way that the powder of the active layer in the base material is introduced, which is dissolved or in molten form.

Als Losunysmlttcll für das Polyvinylldcfluorid kommt dabei vor allem N,~N'-Dimethylacetamid oder auch ein Methyl-Äthyl-Keton in Betracht.The main solution for the polyvinyl fluoride is N, ~ N'-dimethylacetamide or a methyl-ethyl-ketone into consideration.

Die Herstellung kann aber auch in der Weise vor sich gehen, daß das Pulver der aktiven Schicht mittels eines Vakuumprozesses in den Grundstoff eingebracht wird.The production can also take place in such a way that the Powder of the active layer introduced into the base material by means of a vacuum process will.

Dies geht in der Weise vor sich, daß das ZnS-Pulver zuerst in das gelöste oder geschmolzene Polyvinylidenfluorid gleichmäßig verteilt wird. Nach Verflüchtigung des Lösungsmittels bzw. Erstarren des Grundstoffes wird dann die erhaltene PVDF-Folie gezon und/oder gereckt . Darauf wird eine zweite PVDF-roijc über die erste PVDF-Folie - die des ZnS-Pulver enthält - gezogen und der Zwischenraum zwischen den beiden Teilen evakuiert, so daß elnc feste, zusammenhtingende Verbundfolie erhalten wird.This is done in such a way that the ZnS powder goes into the dissolved or melted polyvinylidene fluoride is evenly distributed. After volatilization of the solvent or solidification of the base material is then the PVDF film obtained zoned and / or stretched. Then a second PVDF-roijc is over the first PVDF film - which contains the ZnS powder - pulled and the space between evacuated the two parts, so that a solid, cohesive composite film is obtained will.

Die nachfolgende Figur soll das erflndungsgemäßc Elektrolumineszenz-Display noch näher erläutern.The following figure is intended to show the electroluminescent display according to the invention explain in more detail.

Es bedeutet dabei in der dargestellten Display-Zelle 1 eine Abdeckung aus Glas oder Kunststoff, 2 die durchsichtige Frontelektrode, 3 die obere PVDF-Folie. 4 ist dann die Elektrolumineszenzschicht; dabei handelt es sich um ein Zinksulfidpulver, das in Polyvinylidenfluorid eingebettet ist. Die rückseitige Elektrode ist mit 5 gekennzeichnet. 6 ist die untere Glasabdeckschicht.It means a cover in the display cell 1 shown made of glass or plastic, 2 the transparent front electrode, 3 the upper PVDF film. 4 is then the electroluminescent layer; this is a zinc sulfide powder, which is embedded in polyvinylidene fluoride. The back electrode is marked with 5 marked. 6 is the lower glass cover layer.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß bei >:lektrolumineszenz-Displays die Helligkeit der aktiven Schicht vergrößert wird, wodurch es möglich ist, die Anregungsspannung zu erniedrigen.The advantages achieved with the invention are in particular: that with>: electroluminescent displays increase the brightness of the active layer thereby making it possible to lower the excitation voltage.

Außerdem ist es bei der Herstellung der Elektrolumineszenzschicht nicht mehr notwendig, ein anderes Bindemittel für die aktive Schicht einzusetzen, da durch das PDVF ein vollständiger Einschluß der ZnS-Körner gegeben ist.It is also used in the production of the electroluminescent layer no longer necessary to use a different binder for the active layer, since the PDVF completely encloses the ZnS grains.

LeerseiteBlank page

Claims (6)

Elektrolumineszenz-Display und Verfahren zu dessen Herstellung Patentansprüche: ) Elektrolumineszenz-Display, bestehend aus zwei parallelen Platten, zwischen denen mittels eines elektrischen Wechselfeldes eine anregbare Elektrolumineszenzschicht eingeschlossen ist und auf deren Außenseiten Elektroden angeordnet sind, dadurch gekennzeichnet, daß die Pulver der aktiven Schicht in eine organische Verbindung mit hoher Dielektrizitätskonstante eingebettet sind. Electroluminescent display and method for its production Patent claims: ) Electroluminescent display consisting of two parallel plates between which a stimulable electroluminescent layer by means of an alternating electric field is enclosed and on the outer sides of which electrodes are arranged, thereby characterized in that the powder of the active layer is converted into an organic compound are embedded with a high dielectric constant. 2) Elektrolumineszenz-Display nach Anspruch 1, dadurch gekennzeichnet, daß es sich bei der organischen Verbindung um Polyvinylidenfluorid handelt. 2) electroluminescent display according to claim 1, characterized in that that the organic compound is polyvinylidene fluoride. 3) Elektrolumineszenz-Display nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , d a ß es sich bei der aktiven Schicht um Zinksulfidpulver handelt. 3) electroluminescent display according to claim 1, d a d u r c h g e No indication that the active layer is zinc sulfide powder acts. 4) Verfahren zur Herstellung eines Elektrolumineszen-Displays nach einem der Ansprüche 1 bis S d a d u r c h g e k e n n. z e 1 c h n e t , d a ß die organische verbindung, in die das Pulver der aktiven Schicht eingebracht wird, in Lösung oder in geschmolzener Form vorliegt.4) Method for producing an electroluminescent display according to one of claims 1 to S d a d u r c h g e k e n n. z e 1 c h n e t, d a ß die organic compound into which the powder of the active layer is introduced in Solution or in molten form. 5) Verfahren zur Herstellung eines Elektrolumineszenz-Displays nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , d a ß das Pulver der aktiven Schicht mittels einer Vakuumeinbettung eingebracht wird.5) Method for producing an electroluminescent display according to one of claims 1 to 3, d a d u r c h e k e n n n z e i c h n e t, d a ß das Powder of the active layer is introduced by means of vacuum embedding. 6) Verfahren zur Herstellung eines Elektrolumineszenz-Displays flach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , d.a ß als Lösungsmittel für die organische Verbindung NiVN-Dimethylacetamid Verwendung findet.6) Method of making an electroluminescent display flat Claim 4, d a d u r c h g e k e n n n z e i c h n e t, d.a ß as a solvent for the organic compound NiVN dimethylacetamide is used.
DE19813113217 1981-04-02 1981-04-02 Electroluminescent display and method for its manufacture Withdrawn DE3113217A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19813113217 DE3113217A1 (en) 1981-04-02 1981-04-02 Electroluminescent display and method for its manufacture

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Application Number Priority Date Filing Date Title
DE19813113217 DE3113217A1 (en) 1981-04-02 1981-04-02 Electroluminescent display and method for its manufacture

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DE3113217A1 true DE3113217A1 (en) 1982-10-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818793A1 (en) * 1995-03-30 1998-01-14 Matsushita Electric Industrial Co., Ltd. El sheet diaphragm and switch using the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205393A (en) * 1953-12-09 1965-09-07 Thorn Electrical Ind Ltd Electroluminescent lamp with a dielectric reflective material
DE1213046B (en) * 1962-04-27 1966-03-24 American Cyanamid Co Electroluminescent surface lamp
US3461075A (en) * 1963-05-29 1969-08-12 Air Reduction Poly 2,2,2-trifluoroethyl vinyl ether containing electroluminescent phosphor particles
DE2941245A1 (en) * 1978-10-13 1980-04-24 Midland Ross Corp ELECTROLUMINESCENT CELL AND METHOD FOR THE PRODUCTION THEREOF

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205393A (en) * 1953-12-09 1965-09-07 Thorn Electrical Ind Ltd Electroluminescent lamp with a dielectric reflective material
DE1213046B (en) * 1962-04-27 1966-03-24 American Cyanamid Co Electroluminescent surface lamp
US3461075A (en) * 1963-05-29 1969-08-12 Air Reduction Poly 2,2,2-trifluoroethyl vinyl ether containing electroluminescent phosphor particles
DE2941245A1 (en) * 1978-10-13 1980-04-24 Midland Ross Corp ELECTROLUMINESCENT CELL AND METHOD FOR THE PRODUCTION THEREOF

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818793A1 (en) * 1995-03-30 1998-01-14 Matsushita Electric Industrial Co., Ltd. El sheet diaphragm and switch using the same
EP0818793A4 (en) * 1995-03-30 1999-01-20 Matsushita Electric Ind Co Ltd El sheet diaphragm and switch using the same

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