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EP1958015A1 - Display element for an electric appliance - Google Patents

Display element for an electric appliance

Info

Publication number
EP1958015A1
EP1958015A1 EP06807501A EP06807501A EP1958015A1 EP 1958015 A1 EP1958015 A1 EP 1958015A1 EP 06807501 A EP06807501 A EP 06807501A EP 06807501 A EP06807501 A EP 06807501A EP 1958015 A1 EP1958015 A1 EP 1958015A1
Authority
EP
European Patent Office
Prior art keywords
light
display element
display
emitting diode
scattering
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Withdrawn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
EP06807501A
Other languages
German (de)
French (fr)
Inventor
Martin Buchstab
Irene Dumkow
Adolf Feinauer
Klaus Flinner
Bernd Heger
Peter Nalbach
Kasim Yazan
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1958015A1 publication Critical patent/EP1958015A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G09F13/0409—Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent

Definitions

  • the present invention relates to a display element via a light display in an electrical device, in particular a household appliance such as a refrigerator or freezer.
  • Light-emitting diodes have long been used for small-format LEDs. In recent years, very bright light emitting diodes in all colors of the spectrum have come on the market increasingly.
  • Object of the present invention is to provide a display element with a light emitting diode, which is simple and compact and easy to read from a wide range of angles.
  • At least two light-scattering elements are arranged in the beam path between the light emitting diode and the backlit display panel.
  • the first of these serves to fan out the collimated beam of the light emitting diode so that it illuminates the second light scattering element on a large area.
  • the display element is clearly visible to any viewer whose display panel and illuminated second diffusing element are in line.
  • At least one of the light-scattering elements, the second lying in the beam path is preferably a ground glass. This can be realized in a simple manner as a coating layer applied on the display itself.
  • the light-scattering element adjacent to the light-emitting diode is preferably a lens.
  • a cylindrical lens is used to illuminate a display panel having a cavum / width ratio different from one. A panel that is wider than tall is a good place to label short texts or single words.
  • the beam path can be surrounded by the light-scattering elements of reflective side surfaces to avoid light losses to the sides.
  • Figure 1 is a schematic perspective view of a water dispenser for installation in a refrigeration device, which is equipped with display elements according to the invention.
  • Figure 2 is a view of the refrigerator with built-in water dispenser.
  • FIG. 3 shows a horizontal section through display elements of the water dispenser according to a first embodiment
  • FIG. 4 shows a section analogous to FIG. 3 according to a second embodiment
  • Fig. 5 shows a section analogous to FIG. 3 according to a third embodiment.
  • FIG. 1 shows a plastic housing provided for installation in a refrigeration appliance door with a substantially cuboid base body 1, which is provided to be mounted inside the door, embedded in an insulation material layer, and a flat parallelepiped projection 2, which is provided, to project in the assembled state by a cut into the outer wall of the door window. Pins 3 of the projection 2 serve to anchor at the edges of the window.
  • An outlet for water and / or ice which is not visible in the figure, opens into a central niche 4 to fill a container placed there. Above the niche 4 is a plurality of control buttons 5. Over this light wells 6 are visible, which each belong to display elements which indicate a related to the operation of the control buttons 5 state of the water dispenser or an icemaker.
  • a transparent plastic cover 7, which is offset in the figure conceals the light shafts 6 and has a plurality of openings 8, through which the control buttons 5 are accessible.
  • Fig. 2 shows by way of illustration the water dispenser mounted in the door 9 of a refrigerator.
  • An attached frame 13 surrounds the projection 2 and conceals edges of a cut into the front of the door 9 solid.
  • Fig. 3 shows a horizontal partial section through the water dispenser of Fig. 1 in a horizontal, extending through the display elements level.
  • Each display element comprises a mounted on a board 10 LED 1 1 and a front, held in a socket of the body 1 diverging lens 12. Since the light wells 6, as shown in Fig. 1, are wider than high, the lenses 12 are cylindrical or astigmatic, d. H. it has a shorter focal length in a horizontal sectional plane than in a vertical sectional plane.
  • the diverging lenses 12 each close one end of the light wells 6, the other end is covered by the aperture 7.
  • the light-emitting diodes 1 1 facing inside the aperture 7 is formed as a ground glass, z. B. by sandblasting, by a glued scattering foil, applied scattering lacquer or the like.
  • Aperture 7 attached. Due to the action of the diverging lens 12, the lettering is uniformly illuminated over its entire surface, and due to the ground glass at the
  • the frame 13 is also visible in section, which is clamped and held on the one hand between a side edge of the projection 2 and one of the pin 3 and on the other hand rests against the front of the outer wall 14 of the door and so the edge of the door concealed window through which the projection 2 extends.
  • the light shafts 6 are replaced by integral with the diverging lenses 12 crystal-clear plastic body 15, the light at their side walls 16 by total reflection to the diaphragm 7.
  • each display element on a light shaft 6, but the diverging lenses 12 are replaced by a second ground glass 17, which also fanning the light beam of the LEDs 1 1 striking them.
  • this walls are here preferably mirrored or at least white colored.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

The invention relates to a display element comprising a light-emitting diode (11) and a display field (7) that is backlit by the light-emitting diode (11). In said element, the beam path of the light in the display element (7) passes through at least two light scattering elements (12, 17).

Description

Anzeigeelement für ein elektrisches Gerät Display element for an electrical device
Die vorliegende Erfindung betrifft ein Anzeigeelement über eine Leuchtanzeige in einem elektrischen Gerät, insbesondere einem Haushaltsgerät wie etwa ein Kühl- oder Gefrierschrank.The present invention relates to a display element via a light display in an electrical device, in particular a household appliance such as a refrigerator or freezer.
Leuchtdioden werden für kleinformatige Leuchtanzeigen seit langem verwendet. In den letzten Jahren sind zunehmend sehr lichtstarke Leuchtdioden in allen Farben des Spektrums auf den Markt gekommen. Ein Problem dieser Leuchtdioden, vor allem der weißen und blauen Leuchtdioden, ist, dass sie einen stark gebündelten Strahl emittieren, der, wenn er direkt aufs Auge trifft, als blendend empfunden wird. Wenn solche Leuchtdioden für eine Leuchtanzeige eingesetzt werden sollen, muss darauf geachtet werden, dass ein direkter Blick auf die Leuchtdiode nicht möglich ist. Auf Grund der starken Bündelung kann eine solche Leuchtdiode, wenn sie an einem hinterleuchteten Anzeigefeld angebracht ist, nur eine kleine Fläche dieses Anzeigefeldes beleuchten, diese jedoch sehr grell. Je weiter jedoch die Leuchtdiode von dem Anzeigefeld entfernt ist, um so sperriger wird das gesamte Anzeigeelement, und um so kleiner ist der Winkelbereich, aus dem die Anzeige deutlich sichtbar ist.Light-emitting diodes have long been used for small-format LEDs. In recent years, very bright light emitting diodes in all colors of the spectrum have come on the market increasingly. One problem with these light-emitting diodes, especially the white and blue light-emitting diodes, is that they emit a highly focused beam which, when it strikes the eye, is perceived as dazzling. If such LEDs are to be used for a light display, care must be taken that a direct view of the light emitting diode is not possible. Due to the strong bundling such a light-emitting diode, when it is attached to a backlit display panel, illuminate only a small area of this panel, but this very bright. However, the farther the LED is from the display panel, the more bulky the entire display element, and the smaller the angular range from which the display is clearly visible.
Aufgabe der vorliegenden Erfindung ist, ein Anzeigeelement mit einer Leuchtdiode anzugeben, das einfach und kompakt baut und aus einem großen Winkelbereich gut ablesbar ist.Object of the present invention is to provide a display element with a light emitting diode, which is simple and compact and easy to read from a wide range of angles.
Zu diesem Zweck sind zwischen der Leuchtdiode und dem von ihr hinterleuchteten Anzeigefeld wenigstens zwei Licht streuende Elemente im Strahlengang angeordnet. Das erste davon dient zum Auffächern des gebündelten Strahls der Leuchtdiode, so dass dieser das zweite Licht streuende Element auf einer großen Fläche beleuchtet. Das Anzeigeelement ist für jeden Betrachter gut sichtbar, für den sich Anzeigefeld und beleuchtetes zweites streuendes Element auf einer Linie befinden. Wenigstens eines der Licht streuenden Elemente, das an zweiter Stelle im Strahlengang liegende, ist vorzugsweise eine Mattscheibe. Diese kann auf einfache Weise als eine auf dem Anzeigefeld selbst aufgetragene Lackschicht realisiert sein. Das der Leuchtdiode benachbarte lichtstreuende Element ist vorzugsweise eine Linse. Vorzugsweise wird eine Zylinderlinse verwendet, um ein Anzeigefeld mit einem von eins abweichenden Höhlen/Breitenverhältnis zu beleuchten. Ein Anzeigefeld, das breiter ist als hoch, eignet sich gut zur Beschriftung mit kurzen Texten oder einzelnen Wörtern.For this purpose, at least two light-scattering elements are arranged in the beam path between the light emitting diode and the backlit display panel. The first of these serves to fan out the collimated beam of the light emitting diode so that it illuminates the second light scattering element on a large area. The display element is clearly visible to any viewer whose display panel and illuminated second diffusing element are in line. At least one of the light-scattering elements, the second lying in the beam path, is preferably a ground glass. This can be realized in a simple manner as a coating layer applied on the display itself. The light-scattering element adjacent to the light-emitting diode is preferably a lens. Preferably, a cylindrical lens is used to illuminate a display panel having a cavum / width ratio different from one. A panel that is wider than tall is a good place to label short texts or single words.
Der Strahlengang kann zwischen den Licht streuenden Elementen von spiegelnden Seitenflächen umgeben sein, um Lichtverluste zu den Seiten zu vermeiden.The beam path can be surrounded by the light-scattering elements of reflective side surfaces to avoid light losses to the sides.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren. Es zeigen:Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures. Show it:
Fig. 1 eine schematische perspektivische Ansicht eines Wasserspenders zum Einbau in ein Kältegerät, der mit erfindungsgemäßen Anzeigeelementen ausgestattet ist;Figure 1 is a schematic perspective view of a water dispenser for installation in a refrigeration device, which is equipped with display elements according to the invention.
Fig. 2 eine Ansicht des Kältegeräts mit eingebautem Wasserspender;Figure 2 is a view of the refrigerator with built-in water dispenser.
Fig. 3 einen horizontalen Schnitt durch Anzeigeelemente des Wasserspenders gemäß einer ersten Ausgestaltung;3 shows a horizontal section through display elements of the water dispenser according to a first embodiment;
Fig. 4 einen zu Fig. 3 analogen Schnitt gemäß einer zweiten Ausgestaltung; undFIG. 4 shows a section analogous to FIG. 3 according to a second embodiment; FIG. and
Fig. 5 einen Schnitt analog Fig. 3 gemäß einer dritten Ausgestaltung.Fig. 5 shows a section analogous to FIG. 3 according to a third embodiment.
Fig. 1 zeigt ein zum Einbau in einer Kältegerätetür vorgesehenes Kunststoffgehäuse mit einem im wesentlichen quaderförmigen Grundkörper 1 , der vorgesehen ist, um im Inneren der Tür, eingebettet in eine Isolationsmaterialschicht, montiert zu werden, und einem flach quaderförmigen Vorsprung 2, der vorgesehen ist, um im montierten Zustand durch ein in die Außenwand der Tür geschnittenes Fenster vorzuspringen. Zapfen 3 des Vorsprungs 2 dienen zur Verankerung an den Rändern des Fensters. Ein Auslass für Wasser und/oder Eis, der in der Fig. nicht sichtbar ist, mündet in eine zentrale Nische 4, um einen dort platzierten Behälter zu befüllen. Oberhalb der Nische 4 befindet sich eine Mehrzahl von Bedientasten 5. Über diesen sind Lichtschächte 6 sichtbar, die jeweils zu Anzeigeelementen gehören, welche einen mit der Betätigung der Bedientasten 5 zusammenhängenden Zustand des Wasserspenders oder eines Eisbereiters anzeigen. Einen in der Fig. abgesetzt dargestellte Blende 7 aus transparentem Kunststoff verdeckt in montierten Zustand die Lichtschächte 6 und weist eine Mehrzahl von Öffnungen 8 auf, durch welche die Bedientasten 5 zugänglich sind.1 shows a plastic housing provided for installation in a refrigeration appliance door with a substantially cuboid base body 1, which is provided to be mounted inside the door, embedded in an insulation material layer, and a flat parallelepiped projection 2, which is provided, to project in the assembled state by a cut into the outer wall of the door window. Pins 3 of the projection 2 serve to anchor at the edges of the window. An outlet for water and / or ice, which is not visible in the figure, opens into a central niche 4 to fill a container placed there. Above the niche 4 is a plurality of control buttons 5. Over this light wells 6 are visible, which each belong to display elements which indicate a related to the operation of the control buttons 5 state of the water dispenser or an icemaker. In the assembled state, a transparent plastic cover 7, which is offset in the figure, conceals the light shafts 6 and has a plurality of openings 8, through which the control buttons 5 are accessible.
Fig. 2 zeigt zur Veranschaulichung den Wasserspender, montiert in der Tür 9 eines Kühlschranks. Ein aufgesteckter Rahmen 13 umgibt den Vorsprung 2 und verdeckt Ränder eines in die Vorderseite der Tür 9 geschnittenen Festers.Fig. 2 shows by way of illustration the water dispenser mounted in the door 9 of a refrigerator. An attached frame 13 surrounds the projection 2 and conceals edges of a cut into the front of the door 9 solid.
Fig. 3 zeigt einen horizontalen Teilschnitt durch den Wasserspender der Fig. 1 in einer horizontalen, durch die Anzeigeelemente verlaufenden Ebene. Jedes Anzeigeelement umfasst eine auf einer Platine 10 montierte Leuchtdiode 1 1 und eine davor liegende, in einer Fassung des Grundkörpers 1 gehaltene Zerstreuungslinse 12. Da die Lichtschächte 6, wie in Fig. 1 gezeigt, breiter sind als hoch, sind die Linsen 12 zylindrisch oder astigmatisch, d. h. sie weist in einer horizontalen Schnittebene eine kürzere Brennweite auf als in einer vertikalen Schnittebene.Fig. 3 shows a horizontal partial section through the water dispenser of Fig. 1 in a horizontal, extending through the display elements level. Each display element comprises a mounted on a board 10 LED 1 1 and a front, held in a socket of the body 1 diverging lens 12. Since the light wells 6, as shown in Fig. 1, are wider than high, the lenses 12 are cylindrical or astigmatic, d. H. it has a shorter focal length in a horizontal sectional plane than in a vertical sectional plane.
Die Zerstreuungslinsen 12 verschließen jeweils ein Ende der Lichtschächte 6, das andere Ende ist abgedeckt von der Blende 7. Die den Leuchtdioden 1 1 zugewandte Innenseite der Blende 7 ist als eine Mattscheibe ausgebildet, z. B. durch Sandstrahlen, durch eine aufgeklebte Streufolie, aufgetragenen Streulack oder der gleichen. Ein anzuzeigenderThe diverging lenses 12 each close one end of the light wells 6, the other end is covered by the aperture 7. The light-emitting diodes 1 1 facing inside the aperture 7 is formed as a ground glass, z. B. by sandblasting, by a glued scattering foil, applied scattering lacquer or the like. One to display
Schriftzug ist - in Positiv- oder Negativdarstellung - ebenfalls an der Innenseite derLettering is - in positive or negative representation - also on the inside of the
Blende 7 angebracht. Durch die Wirkung der Zerstreuungslinse 12 ist der Schriftzug auf seiner ganzen Fläche gleichmäßig beleuchtet, und auf Grund der Mattscheibe an derAperture 7 attached. Due to the action of the diverging lens 12, the lettering is uniformly illuminated over its entire surface, and due to the ground glass at the
Rückseite der Blende 7 ist der Schriftzug aus einem großen Raumwinkel heraus gut lesbar.Back of the panel 7 is the lettering from a large solid angle out clearly legible.
In der Fig. 3 ist ferner der Rahmen 13 im Schnitt sichtbar, der einerseits zwischen einer Seitenflanke des Vorsprungs 2 und einem der Zapfen 3 eingeklemmt und gehalten ist und andererseits an der Vorderseite der Außenwand 14 der Tür anliegt und so den Rand des in die Tür geschnittenen Fensters verbirgt, durch das sich der Vorsprung 2 erstreckt. - A -In Fig. 3, the frame 13 is also visible in section, which is clamped and held on the one hand between a side edge of the projection 2 and one of the pin 3 and on the other hand rests against the front of the outer wall 14 of the door and so the edge of the door concealed window through which the projection 2 extends. - A -
In der Ausgestaltung der Fig. 4 sind die Lichtschächte 6 ersetzt durch mit den Zerstreuungslinsen 12 einteilige glasklare Kunststoffkörper 15, die an ihren Seitenwänden 16 Licht durch Totalreflexion zu der Blende 7 leiten.In the embodiment of FIG. 4, the light shafts 6 are replaced by integral with the diverging lenses 12 crystal-clear plastic body 15, the light at their side walls 16 by total reflection to the diaphragm 7.
In der Ausgestaltung der Fig. 5 weist wiederum jedes Anzeigeelement einen Lichtschacht 6 auf, doch sind die Zerstreuungslinsen 12 durch eine zweite Mattscheibe 17 ersetzt, die ebenfalls den auf sie treffenden Lichtstrahl der Leuchtdioden 1 1 auffächert. Um Lichtverluste durch auf die Wände der Lichtschächte auftreffendes Licht zu vermeiden, sind dieses Wände hier vorzugsweise verspiegelt oder wenigstens weiß gefärbt. In the embodiment of FIG. 5, in turn, each display element on a light shaft 6, but the diverging lenses 12 are replaced by a second ground glass 17, which also fanning the light beam of the LEDs 1 1 striking them. In order to avoid light losses by incident on the walls of the light wells light, this walls are here preferably mirrored or at least white colored.

Claims

Patentansprüche claims
1 . Anzeigeelement mit einer Leuchtdiode (1 1 ) und einem von der Leuchtdiode (1 1 ) hinterleuchteten Anzeigefeld (7), dadurch gekennzeichnet, dass der Strahlengang des Lichts in dem Anzeigeelement (7) wenigstens zwei Licht streuende Elemente (12, 17) passiert.1 . Display element with a light-emitting diode (1 1) and one of the light-emitting diode (1 1) backlit display panel (7), characterized in that the beam path of the light in the display element (7) at least two light-scattering elements (12, 17) passes.
2. Anzeigeelement nach Anspruch 1 , dadurch gekennzeichnet, dass wenigstens eines der Licht streuenden Elemente eine Mattscheibe ist.2. Display element according to claim 1, characterized in that at least one of the light-scattering elements is a ground glass.
3. Anzeigeelement nach Anspruch 2, dadurch gekennzeichnet, dass das wenigstens eine Licht streuende Element eine auf dem Anzeigefeld (7) aufgetragene Lackschicht ist.3. Display element according to claim 2, characterized in that the at least one light-scattering element is a on the display panel (7) applied paint layer.
4. Anzeigeelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das der Leuchtdiode (1 1 ) benachbarte Licht streuende Element (12) eine Linse ist.4. Display element according to one of the preceding claims, characterized in that the light-emitting diode (1 1) adjacent light-scattering element (12) is a lens.
5. Anzeigeelement nach Anspruch 4, dadurch gekennzeichnet, dass die Linse (12) eine Zylinderlinse ist.5. Display element according to claim 4, characterized in that the lens (12) is a cylindrical lens.
6. Anzeigeelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Strahlengang zwischen den Licht streuenden Elementen von spiegelnden Wänden umgeben ist. 6. Display element according to one of the preceding claims, characterized in that the beam path between the light-scattering elements is surrounded by reflective walls.
EP06807501A 2005-11-30 2006-10-24 Display element for an electric appliance Withdrawn EP1958015A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005057166A DE102005057166A1 (en) 2005-11-30 2005-11-30 Display element for electrical appliance has light emitting diodes, beam path of light in display element that passes at least two light-scattering elements
PCT/EP2006/067705 WO2007062935A1 (en) 2005-11-30 2006-10-24 Display element for an electric appliance

Publications (1)

Publication Number Publication Date
EP1958015A1 true EP1958015A1 (en) 2008-08-20

Family

ID=37588907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06807501A Withdrawn EP1958015A1 (en) 2005-11-30 2006-10-24 Display element for an electric appliance

Country Status (6)

Country Link
US (1) US20090303695A1 (en)
EP (1) EP1958015A1 (en)
CN (1) CN101317116A (en)
DE (1) DE102005057166A1 (en)
RU (1) RU2008121418A (en)
WO (1) WO2007062935A1 (en)

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DE102005057166A1 (en) 2007-05-31
US20090303695A1 (en) 2009-12-10
RU2008121418A (en) 2010-01-10
CN101317116A (en) 2008-12-03
WO2007062935A1 (en) 2007-06-07

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