EP3147554A1 - Une source lumineuse pour phares de vehicules comprenant delo et son procede de fabrication - Google Patents

Une source lumineuse pour phares de vehicules comprenant delo et son procede de fabrication Download PDF

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Publication number
EP3147554A1
EP3147554A1 EP15186481.6A EP15186481A EP3147554A1 EP 3147554 A1 EP3147554 A1 EP 3147554A1 EP 15186481 A EP15186481 A EP 15186481A EP 3147554 A1 EP3147554 A1 EP 3147554A1
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EP
European Patent Office
Prior art keywords
oled
plastic
encapsulated
plate
recess
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Withdrawn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
EP15186481.6A
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German (de)
English (en)
Inventor
Marco Vollmer
Thorsten Ricking
Horst Melzer
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.)
Odelo GmbH
Original Assignee
Odelo 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 Odelo GmbH filed Critical Odelo GmbH
Priority to EP15186481.6A priority Critical patent/EP3147554A1/fr
Publication of EP3147554A1 publication Critical patent/EP3147554A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F21S43/145—Surface emitters, e.g. organic light emitting diodes [OLED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F21S43/195—Details of lamp holders, terminals or connectors

Definitions

  • the invention relates to a light source comprising at least one OLED as a light source according to the preamble of claim 1 and to a method for the production thereof according to the preamble of claim 11.
  • Incandescent lamps gas discharge lamps and, inter alia, because of their substantial advantage of a substantially higher luminous efficacy with the same power consumption, inorganic light-emitting diodes (LEDs) are increasingly being used as light sources.
  • LEDs inorganic light-emitting diodes
  • OLEDs organic light-emitting diodes
  • OLED is a luminescent thin-film device made from organic semiconducting materials, which differs from the LEDs in that no single-crystal materials are required. Compared to inorganic LEDs, OLEDs can therefore be produced using inexpensive thin-film technology. As a result, OLEDs make it possible to produce flat light sources which on the one hand have a very thin appearance and, on the other hand, have a particularly homogeneous appearance when used as a luminous surface visible through the lens of a vehicle lamp.
  • OLEDs consist of at least one stack comprising organic semiconducting materials with at least one emitter layer enclosed between electrically conductive, for example metallic layers for anode and cathode.
  • OLEDs have a layer stack height of the order of about 100 nm.
  • OLEDs In order to be used in vehicle lights, OLEDs have to be the vehicle components of and within vehicle lights and during their development, for example, by shaker, chemical and mechanical exposure and climate chamber simulated and formulated in the form of technical requirements conditions of use with respect to thermal, mechanical and other, even combined environmental pollution, such as noxious gas, moisture, moisture together with heat, moisture together with frost, meet.
  • the stack or stacks are encapsulated with an inorganic material, especially glass, for protection against water, oxygen and for protection against other environmental influences, such as scratch damage and / or pressure loading.
  • OLEDs intended for use in vehicle lights have hitherto been applied to glass slides as carrier material.
  • Glass has a low gas permeability, which is advantageous for the organic layers of OLEDs, so that the support material simultaneously forms a protective layer.
  • the glass plates provided for encapsulation of the layer stacks are relatively thin, each about 0.7 to 1.2 mm, and thus also relatively fragile. Above all, the glass outer edges are sensitive to mechanical stress and can easily break out.
  • the glass plates are even thinner, if no thin-layer encapsulation is added to the layer stack, since then working with a cavity glass.
  • the glass is milled out on the cathode, for example, to accommodate the so-called getter, whose task is to absorb moisture, which may occur, for example, by diffusion through the adhesive layer between the two glass plates inside the OLED and protect the organic layers hereof ,
  • the cavity glass thus has thicknesses of about 0.5 mm and less in the middle region and is therefore very sensitive to pressure loads. Also, by pressure loading the getter, which is arranged in correspondingly executed OLEDs with some distance to the organic layers, must not press on the organic layers, as this could damage the few nanometers thick layers, which would lead to a partial or total failure of the OLED ,
  • OLEDs which are constructed with glass platelets and are referred to as OLED platelets, must therefore be picked up and held as free as possible from mechanical stresses (stress-free) and moments (torque-free) in a vehicle lamp.
  • OLEDs which are encapsulated for use in vehicle luminaires by means of, for example, glass, to be gripped and held without damage to mechanical stresses occurring during assembly and during driving.
  • a back surface of an OLED wafer made of metal or glass, which represents a non-emitting region, can be embodied.
  • transparent areas in the OLED are possible, but with the disadvantage that then the adhesive surface must be recessed in this area and thus the holding power is reduced.
  • Another solution is to make the adhesive in the transparent area of an OLED, which is then glued over its entire surface with a plastic carrier.
  • EP 2 592 331 A1 is known a vehicle lamp with a means of a holder housed in the luminaire interior OLED.
  • the holder is designed as a frame that surrounds the OLED at least partially.
  • an elastomer between the holder and the OLED. What remains unclear here is how the OLED should be held tension-free, so that its glass platelets are not destroyed and / or damaged.
  • the luminous means comprises an OLED arranged on a support.
  • the OLED is connected, for example, by gluing to a flat carrier.
  • the carrier produced, for example, by injection molding has a connection means with which the illuminant can be electrically and mechanically connected to the motor vehicle.
  • the connecting means in the form of a pin with locking means is arranged centrally on the back of the carrier. The disadvantage of this is that when inserting and unplugging the carrier thus the risk of destruction of the front and back sides of the OLED forming glass plates.
  • US 2011/089811 A1 is a light source with an OLED known as a light source.
  • the OLED is arranged on a curved carrier.
  • the carrier is made with the curvature.
  • the planar OLED is applied to the carrier by bringing it elastically into planar form. After the application of the OLED, the elastic deformation of the carrier is canceled so that the curvature of the carrier is imposed on the OLED.
  • the disadvantage of this is that the OLED is not kept free of mechanical stresses and thus there is a risk of destruction of the at least one serving as the basis of the OLED glass plate.
  • An object of the invention is to develop a light source with at least one OLED as the light source, which meets the technical requirements placed on vehicle lights and all components installed in these, and to provide a method for its production.
  • a first subject of the invention accordingly relates to a light source intended for use in conjunction with a vehicle lamp.
  • the luminous means comprises at least one OLED as light source.
  • the OLED consists of at least one stack comprising organic semiconducting materials with at least one emitter layer enclosed between electrically conductive, for example metallic layers for anode and cathode.
  • the stack or stacks are for protection against water, oxygen and to protect against other environmental influences, such as scratch damage and / or pressure at least front and back, for example, preferably encapsulated with an inorganic material, in particular with glass.
  • a back-encapsulating layer may be made of, for example, a metal or a metal alloy.
  • serving for front and / or rear encapsulation glass plates and / or plastic plates on its side facing away from the organic layers inside the OLED outside have other materials, such as aluminum for heat conduction and -spreitzung.
  • the OLED constructed as described above by way of example, referred to briefly as the OLED plate, has a front side, a rear side and a circumferential edge which connects its front and rear sides.
  • the OLED plate is encapsulated and / or encapsulated at least at its edges or part of its peripheral edge of a plastic holder.
  • the plastic holder thus forms an at least on a part of the circumferential edge of the OLED plate this surrounding plastic border.
  • the plastic border surrounds the edge of the OLED plate at least in sections along those parts of the peripheral edge, in which the OLED plate is encapsulated by the plastic border and / or encapsulated.
  • the OLED plate can be encapsulated and / or encapsulated in a plan view normal to the front and back of the OLED plate from three sides, for example C-shaped from the plastic holder. Also, a fork-shaped extrusion coating or Umg cordung, in which the OLED plate is disposed between two prongs of a fork-shaped plastic holder, is conceivable.
  • the OLED plate on the front or back completely or partially encapsulated by the plastic holder and / or be cast.
  • the OLED can additionally be molded or cast onto its entire surface from its rear side.
  • the OLED plate can be encapsulated and / or encapsulated in whole or in part by the plastic holder on the front and rear side.
  • plastic material flow aids may be provided in the form of, for example, ribs on the plastic holder.
  • a light source with at least one light source which is encapsulated or encapsulated by a plastic mount at least at its edges or part of its peripheral edge, can also have one or more electronic components.
  • the need to assign one or more electronic components to the light source can result from the fact that one or more more or less complex electronic control circuits can be provided for operating OLEDs as light sources for a light source, for example a vehicle light.
  • a light source with one or more OLEDs as the light source can usually comprise at least one further electronic component in addition to one or more OLEDs that represent electronic components on account of their diode structure. Accordingly, a light source having one or more OLEDs as light sources can have at least one further electronic component in addition to the at least one OLED.
  • the example injection molded plastic holder as a MID technology (MID technology: molded interconnect device ) Be carried out at least part of the conductor tracks with the electrical terminals of the at least one OLED plate electrically connected and / or electrically connectable.
  • MID technology molded interconnect device
  • the plastic holder simultaneously fulfills a number of functions, firstly the stress and torque-free mounting of the at least one OLED wafer, secondly the electrical contacting of the OLED wafer and thirdly the electrical continuity of the OLED wafer with a disposed on the injection-molded circuit carrier, by at least one with the Conductor tracks of the interconnect carrier produced in MID technology connected or connectable electronic component formed electronic control circuit.
  • a printed circuit board carrier produced in MID technology represents an embodiment of injection-molded circuit carriers which are produced in the form of a component, for example a vehicle lamp with integrated conductor tracks in injection molding technology and at the same time take over a mechanical function of the vehicle lamp in addition to their function for electrical contacting of, for example, electronic components and / or light sources For example, an arrangement of light sources along a predetermined geometry with the simultaneous formation of a reflector.
  • OLEDs By means of a previously described illuminant OLEDs can be installed in vehicle lights and used while driving a vehicle without an otherwise constant risk of breakage of their protection against environmental influences required for encapsulation glass slides.
  • the first object of the invention solves the stated object by a socket which is produced by at least partially encapsulating at least one OLED plate of a plastic holder.
  • the plastic holder may be molded onto one or at least two opposite edges of the OLED.
  • Such a socket is permanently connected to the OLED and is not subject to accelerated aging, as is the case with adhesive bonds. Furthermore, for the foreseeable future can not be replaced by other materials replaceable glass plate vibration resistant.
  • a second subject matter of the invention relates to a method for producing a previously described light source comprising at least one OLED in the form of an OLED plate as light source.
  • the method initially provides for inserting at least one OLED wafer into a recess of a mold, which mold has at least one support formed in the recess for each OLED wafer, and which cavity in at least one parallel to the front and back of the OLED wafer.
  • Platelet extending direction has a dimension that is greater than the extent of the OLED plate in this direction.
  • the at least one support can take, for example, the entire surface of the surface of the OLED wafer forming a light output, for example a main light output or provided for emitting light, for example main light emission, on the front or rear side of the OLED wafer.
  • the OLED plate is placed here with the corresponding surface on the at least one support in the recess.
  • the support may be designed such that the OLED plate rests on at least one edge region on the support. A corresponding, applied to the support edge region remains free from the encapsulation or Umg cordung means of plastic holder.
  • the OLED plate is preferably placed free of forces and moments on the at least one support in the recess and is held stationary only by shaping the recess and the support during the encapsulation and / or encapsulation.
  • the method provides to encapsulate the OLED plate with first liquid plastic and / or to encase, wherein the recess is filled with the inserted therein OLED plate with the initially liquid plastic.
  • the process provides for waiting until the initially liquid plastic solidifies.
  • the plastic can be added by heating in its initially liquid state, the solidification is achieved by cooling. Alternatively or additionally, a chemical setting process may take place during the solidification of the initially liquid plastic.
  • the method envisages taking out at least one illuminant of the shape comprising at least one OLED plate which is encapsulated or encapsulated at least around its edges or a part of its peripheral edge by a plastic holder.
  • the method may provide for the recess up to at least one entry or introduction opening for the initially liquid plastic and at least one of the over-molding and / or encapsulation of the OLED plate Discharge or escape opening for to be closed by the initially liquid plastic during its introduction into the recess displaced air.
  • the remaining cavity, comprising the recess or encompassed by the recess, has a shape corresponding to the outer shape of the finished luminous means.
  • the method may provide the OLED plate at least during the introduction of the first liquid plastic in the recess and during the waiting for the solidification of the plastic to cool. This can be done by the at least one support on which the OLED plate rests in the recess is cooled, for example, by a incorporated in the support channel of a cooling circuit through which a coolant flow, for example, can circulate.
  • the cooling can take place by means of a punch, which is lowered before introducing the initially liquid plastic onto at least part of the surface of the OLED wafer facing away from the at least one support and lingers in this position until the plastic has solidified.
  • the stamp may be cooled, for example, passively by utilizing its heat capacity, being retracted to a cooler level of heat when not lowered to an OLED plate, or actively, the stamp being in heat communication with a refrigeration circuit, for example by placing in the Stamp at least one channel of a cooling circuit is incorporated, through which a coolant flow through, for example, can circulate.
  • All of the abovementioned plastic holders produced by partial encapsulation or encapsulation of at least one OLED wafer can accordingly be produced in an injection molding process which, in addition to the molding of the plastic holder, provides for active cooling of the OLED during the injection molding process in order to keep damaging temperature effects away from the organic layers of the OLED ,
  • the method may additionally provide that the recess has a depth that is greater than a thickness of the OLED wafer given by the extension of the OLED wafer from its front side to its back side normal to the front and back side, wherein the recess during the Overmolding and / or overmolding is filled until over the OLED plate.
  • the method may provide for contacting electrical connections of the OLED, for example by wire bonding or or bonding a flexplate, for example by means of ACF (anisotropic conductive film) bonding, before and after inserting the OLED platelet into the mold, and to connect them to the further-contacting conductors.
  • the conductors can be guided out of the recess before, in a later method step, the OLED plate is overmolded and / or encapsulated with initially liquid plastic.
  • the method can provide before or after the introduction of the OLED plate into the mold to protect the electrical connections of the OLED plate with a subsequently removable cover and of the in a later process step, in which the OLED plate with initially liquid plastic encapsulated and / or encapsulated to keep plastic filled in the recess.
  • the method can provide, if appropriate, to introduce interconnected or connectable interconnects into the recess with electrical connections of the OLED platelet, which are then encapsulated and / or encapsulated in a later method step in which the OLED platelet is encapsulated and / or encapsulated with initially liquid plastic be encapsulated and / or encapsulated by the plastic.
  • the method for the simultaneous formation of printed conductors on or in the plastic holder produced by encapsulation and / or encapsulation of the OLED wafer with initially liquid plastic one or more methods of MID technology can provide, such as two-component injection molding, MID hot stamping, laser direct -Structuring, subtractive laser structuring, mask exposure method, film back-injection, melting a continuously supplied copper wire and spraying on the substrates with compressed air.
  • the electrical connections of the OLED can, for example, after the production of the conductor tracks Wire bonding or ACF bonding to be connected to at least a portion of the interconnects.
  • the lamp comprises a plurality of OLED plates, they are preferably spaced apart from each other and separated from each other by a web of the plastic holder.
  • the lighting means may comprise individual or a combination of the features described above and / or subsequently in connection with the method, just as the method may comprise and / or implement individual or a combination of a plurality of features previously and / or subsequently described in connection with the lighting means.
  • the illuminant may alternatively or additionally comprise one or a combination of several in the context of the prior art and / or in one or more of the prior art documents and / or in the following description to those shown in the drawings Have embodiments described features.
  • the invention can be realized by an OLED comprising at least one glass plate for protecting its organic layers, referred to briefly as OLED platelets, which is encapsulated by a plastic holder at least at its edges or part of its peripheral edge.
  • the invention can be realized by a method for producing an OLED encapsulated at least at its edges or a part of its circumferential edge by a plastic holder, in which it is preferably provided to cool the OLED at least during the injection molding process to destruction to prevent their organic layers from rising in temperature.
  • the invention can be realized by a vehicle lamp, in which at least one at least at their edges or a part of its peripheral edge of a plastic holder overmolded OLED alone or with one or more other, the same or differently designed light sources as Light source is provided to fulfill at least one light function of the vehicle lamp.
  • the optionally provided light sources may be, for example, incandescent lamps and / or gas discharge lamps and / or LEDs.
  • a correspondingly designed vehicle lamp comprises, for example, a lamp interior substantially enclosed by a lamp housing and a lens, and at least one illuminating means housed therein and comprising at least one light source for at least one light function of the vehicle lamp.
  • Each vehicle lamp fulfills one or more tasks or functions depending on the design.
  • a light function of the vehicle lamp is provided.
  • Light functions are, for example, in a configuration as a headlamp a function illuminating the road surface, or in a configuration as a signal light, a signal function, such as a Wiederblinklichtfunktion to the direction indicator or a brake light function to indicate a braking action, or.
  • a limiting light function such as a taillight function, to ensure visibility of the vehicle during the day and / or night, such as in a taillight or daytime running light configuration.
  • vehicle lights are thesselbug, on the vehicle flanks and / or on the side mirrors arranged flashing lights, exit lights, such as ambient lighting, marker lights, brake lights, fog lamps, reversing lights, and typically high set third brake lights, so-called Central, High-Mounted Braking lights, daytime running lights, headlamps and fog lights used as turning or cornering lights, as well as combinations thereof.
  • Each light function must fulfill an example prescribed by law light distribution.
  • the light distribution sets at least to be observed, colloquially known as brightness luminous flux in at least to be observed solid angle ranges.
  • At least one light source of the luminous means of a vehicle lamp can be assigned one or more optical elements contributing to the shaping of a light distribution for directing the light.
  • the lens is formed by a transparent cover which is usually made of a plastic material today, which closes off the interior of the lamp and protects the components housed therein, such as one or more lamps, reflectors and alternatively or additionally provided optical elements against the effects of weathering.
  • the luminaire housing or the interior of the luminaire can be subdivided into a plurality of chambers, each with its own light sources and / or illuminants and / or optical elements and, if appropriate, light disks, of which several chambers can be identical and / or each chamber can fulfill a different lighting function.
  • the optical elements mentioned can be at least one reflector and / or at least one lens and / or one or more optical disks or the like arranged in the beam path between at least one light source of the luminous means and the light disk.
  • At least one reflector arranged behind at least one light source of at least one luminous means can be accommodated in the luminaire interior.
  • the reflector may be formed at least in part by a separate component and / or by at least one part of the luminaire housing itself, for example by means of an at least partially reflective coating.
  • the lens itself may alternatively or additionally be formed as an optical element, for example by being preferably provided on the inside with an optical structure contributing to the production of one or more light distributions mentioned above. This may possibly be dispensed with an optical disk.
  • vehicle lights are onsselbug, on the vehicle flanks and / or on the side mirrors and arranged at the rear of vehicle rear lights, exit lights, such as ambient lighting, marker lights, brake lights, fog lights, reversing lights, and typically high set third brake lights, so-called Central, High-Mounted Braking Lights, daytime running lights, headlamps and fog lamps used as turning or cornering lights, as well as combinations thereof.
  • exit lights such as ambient lighting, marker lights, brake lights, fog lights, reversing lights, and typically high set third brake lights, so-called Central, High-Mounted Braking Lights, daytime running lights, headlamps and fog lamps used as turning or cornering lights, as well as combinations thereof.
  • Such a combination is realized, for example, regularly in the known taillights. These include, for example, repeating flashing lights, marker lights, brake lights, fog lights and reversing lights are used to name just one of many realized in tail lights combinations. Neither does this enumeration claim to be complete, nor does this mean that in a tail light all the aforementioned lights must be combined. Thus, for example, only two or three of the mentioned or else other lights in a common luminaire housing a tail light be combined.
  • the plastic holder overmolded or encapsulated by at least one OLED wafer is independent of the OLED structure.
  • the OLEDs may consist of glass-glass surfaces on the outside or glass-aluminum or glass-glass-aluminum. Since the OLEDs predominantly and preferably only marginally, this is irrelevant. Thus, it is not necessary to search for a suitable adhesive or adhesive tape for each outer surface material of the OLED, which meets all the requirements for the stable mounting. Rather, the invention represents a universal solution for many combinations, including those with glass flakes and / or plastic flakes.
  • the invention provides effective protection against damage to glass or transparent plastic existing cover layers of OLED plates during assembly and operation of a vehicle lamp.
  • This protection is supported by the at least partially surrounding the OLED-plate version of the plastic holder produced by encapsulation or encapsulation of the OLED plate.
  • the injection-molded version prevents the transmission of the cover layers made of glass dangerous bending moments on the OLED by the required in the prior art introducing and / or attaching the OLED plate on and / or on a support, since they due to their umg discernungs- or injection molding technology, the OLED plate does not subject to bending moments.
  • the invention thus offers a high protection of the OLED against damage or destruction when handling the lamp, especially during assembly and during operation of a vehicle lamp and a high durability, a high quality impression and low production costs.
  • Advantages over the prior art are also achieving on the one hand the greatest possible optical quality along with the best possible use of the light emitted from an OLED to obtain the greatest possible contribution to a light distribution of at least one light function in particular a vehicle lamp, and on the other hand to ensure the necessary care of care when handling OLEDs, especially when using them in vehicle lights.
  • An in Fig. 1 to Fig. 8 Wholly or partially illustrated illuminant 01 comprises at least one OLED 20 as a light source.
  • the OLED 20 consists of at least one stack comprising organic semiconducting materials with at least one emitter layer enclosed between electrically conductive, for example metallic layers for anode and cathode.
  • the OLED 20 is part of an OLED plate 02, wherein the at least one stack for protection against water, oxygen and to protect against other environmental influences, such as scratch damage and / or pressure load at least front and back, for example, with an inorganic material, in particular with Glass is encapsulated.
  • the OLED plate 02 has a front side 21 formed, for example, by a glass plate, a rear side 22, for example also formed by a glass plate or by a metal layer, and a peripheral edge 23 connecting its front side 21 and rear side 22.
  • the edge can at least partially concave in a bow or as in Fig. 1 to 4 represented convexly curved, or as in Fig. 5 and Fig. 6 shown at least partially straight. Combinations of the section-wise course of the edge 23 are also possible, as is an embodiment of the edge 23 as a free-form geometry.
  • the OLED plate 02 is at least at its edges or a part of its peripheral edge 23 encapsulated by a plastic holder 03 and / or encapsulated.
  • the plastic holder 03 thus forms an at least on a part of the peripheral edge 23 of the OLED plate 02 surrounding this plastic border.
  • the plastic border surrounds the edge 23 of the OLED plate 02 at least in sections along those parts of the peripheral edge 23 in which the OLED plate 02 is encapsulated and / or encapsulated by the plastic holder 03.
  • Glass plates are preferably used for the front and / or rear encapsulation. Accordingly, a glass plate preferably forms the front side 21 and / or the rear side 22.
  • a back-encapsulating layer may be made of, for example, a metal or a metal alloy.
  • the OLED plate 02 can be overmolded and / or encapsulated completely or partially on the front or rear side of the plastic holder 03.
  • the OLED plate 02 can additionally be overmolded on its rear side 22 and / or encapsulated.
  • the plastic holder 03 is at least partially made of a transparent at least visible in the human eye part of the electromagnetic spectrum, also a light emitting serving or provided for light delivery front 21 and / or back 22 of the OLED plate 02 each completely or partially encapsulated and / or encapsulated by a plastic holder 03, which is produced at least at the corresponding front side 21 provided for emitting light and / or rear side 22 made of transparent plastic.
  • the OLED plate 02 can be completely or partially overmolded on the rear side by the plastic holder 03 and / or be encapsulated, whereas the OLED plate 02 is carried out on its front side 21 either free of the plastic holder 03 or only partially encapsulated and / or encapsulated by a plastic holder 03 from a visible at least in part visible to the human eye of the electromagnetic spectrum transparent plastic may be. It should be emphasized that a combination of opaque plastic on the back 22 and transparent plastic on the front 21 by encapsulation or Umg cordung in a multi-stage injection molding process is conceivable.
  • flow aids 30 may be provided in the form of, for example, ribs on the plastic holder 03.
  • the flow aids 30 can additionally serve to increase the rigidity of the finished luminous means 01.
  • the plastic holder 03 may be embodied as a conductor carrier produced in MID technology, at least part of whose conductor tracks are electrically connected to electrical connections of the OLED 20 of the at least one OLED wafer 02 and / or are electrically connectable.
  • the plastic holder 03 simultaneously fulfills several functions, firstly the stress- and torque-free mounting of the at least one OLED wafer 02, secondly the electrical contacting of the OLED 20 of the OLED wafer 02 and thirdly the electrical continuation of the OLED 20 of the OLED wafer 02 with a arranged on the injection-molded circuit substrate, formed by at least one connected to the interconnects of the conductor track carrier produced or connectable electronic component electronic control circuit.
  • the plastic holder 03 produced in MID technology thus forms a circuit carrier, with the conductor tracks of which, in addition to the at least one OLED 20, one or more further electronic components can be electrically contacted and mechanically fastened to the circuit carrier.
  • a simple example of an electronic control circuit relates to the alignment of different brightness levels of individual OLEDs 20 or OLED strands within a group of jointly operated OLEDs 20.
  • Such an electronic control circuit consists of at least one or more series resistors for adjusting the forward voltage of the OLEDs 20 to the electrical system. For example, it is conceivable to sort the OLEDs 20 according to forward voltage and intensity. To compensate for differences between multiple OLED lines, each consisting of series-connected OLEDs 20 of the same forward voltage and intensity, and to obtain a homogeneous brightness distribution of the adjacent OLED strands of OLEDs 20 with different forward voltage and intensity, at least each OLED strand provided with a different series resistor.
  • OLDEs 20 also often require a separate failure detection when used as a light source, especially in vehicle lights. This is due to the low power consumption of OLEDs 20 in general.
  • a control unit housed in a vehicle is not able to detect a change in power extraction from the vehicle electrical system corresponding to the failure of one or fewer OLEDs 20, since a resulting board voltage change is below the vehicle power supply voltage fluctuations occurring during normal operation of a vehicle.
  • An electronic circuit arrangement for failure detection for example accommodated in the vehicle lamp, detects the failure of one or more OLEDs 20 in the vehicle lamp, for example by means of one or more comparators, and communicates this to the control unit.
  • This electronic circuit arrangement for failure detection can be realized by an example applied to the illuminant carrier electronic control circuit.
  • the electronic control circuit comprises in the simplest case a series resistor and optionally in addition a protective diode, but depending on the application may also contain substantially more electronic components, such as e.g. Microcontrollers or controllers, comparators, transistors, protective diodes, electrical resistors, for example as a series resistor, capacitors, ferrites, DC / DC converter circuits, etc.
  • a light source 01 with one or more OLEDs 02 as a light source can comprise at least one further electronic component mentioned above.
  • a light source 01 with one or more OLEDs 20 as light sources can have, in addition to the at least one OLED 20, at least one further electronic component.
  • a particularly compactly constructed illuminant 01 can be obtained, which already comprises one or more electronic control circuits or parts thereof required for operating one or more OLEDs 20 as light sources.
  • the at least one support 40 can wholly or partially occupy a surface of the OLED wafer 02 forming a light output or provided for light emission or forming a front side 21 or rear side 22 of the OLED wafer 02, wherein the OLED wafer 02 with the corresponding surface on the at least a support 40 is placed in the recess of the mold 04.
  • the OLED plate 02 is cooled at least during the introduction of the initially liquid plastic into the recess and during the waiting for the solidification of the plastic. In this way, it can be prevented that the at least one organic layer of the OLED 20 of the OLED plate 02 neither by the introduction of a plastic liquefied by heating in the recess, or by an optionally exothermic chemical Abbindevorgang while waiting for the solidification of at least initially liquid Plastic is damaged.
  • the at least one support 40 on which the OLED plate 02 in the recess of the mold 04 rests is in heat transfer connection with a heat sink or can be brought into such a connection.
  • the support 40 in heat-transfer connection with a heat sink are by being cooled, such as by an incorporated in the support 40 channel of a cooling circuit through which a coolant flow through, for example, can circulate.
  • FIG. 9 An alternative or additional possibility for cooling the OLED plate 02 at least during the introduction of the initially liquid plastic into the recess and during the waiting for the solidification of the plastic is in Fig. 9 shown.
  • the cooling takes place by means of a plunger 05, which is lowered before introducing the initially liquid plastic onto at least part of the surface of the OLED plate 02 facing away from the at least one support 40 and lingers in this position until the plastic has solidified.
  • the stamp 05 may be cooled, for example, passively by utilizing its heat capacity, wherein it is retracted to a cooler heat level when it is not lowered onto an OLED plate 02, or actively, the stamp 05 being in heat transfer connection with a heat sink, For example, by at least one channel 50 of a cooling circuit is incorporated in the stamp 05 through which a coolant flow, for example, can circulate.
  • the support 40 may be formed such that the OLED plate 02 rests on at least one edge region on the support 40. A corresponding edge area which is laid on the support 40 remains free of the encapsulation or encapsulation by means of the plastic support 03.
  • the OLED plate 02 preferably free of forces and moments on the at least one support 40 is placed in the recess of the mold 04 and only by shaping the recess of the mold 04 and the support 40 during the extrusion and / or overmolding is kept stationary.
  • the plastic can be added by heating in its initially liquid state, the solidification is achieved by cooling.
  • a chemical setting process may take place during the solidification of the initially liquid plastic.
  • the method may provide for the recess of the mold 04 to at least one entry or introduction opening for the initially liquid plastic and at least one discharge or escape opening for the initially liquid plastic during the encapsulation and / or encapsulation of the OLED plate 02 Its introduction into the recess displaced air to close.
  • the remaining cavity, comprising the recess or encompassed by the recess, has a geometry corresponding to the outer shape of the finished luminous means.
  • the method may additionally provide that the recess of the mold 04 has a depth which is greater than a thickness of the OLED wafer corresponding to the extension of the OLED wafer 02 from its front side 21 to its rear side 22 normal to front side 21 and rear side 22 02, wherein the recess is filled during the extrusion coating and / or pouring over the OLED plate 02.
  • the method may provide for contacting electrical terminals of the OLED 20, for example by wire bonding or ACF bonding, before and after inserting the OLED chip 02 into the mold, and to connect them to the conductors serving for further contacting.
  • the conductors can be guided out of the recess of the mold 04 before the OLED wafer 02 is coated with liquid plastic initially and / or encapsulated in a later process step.
  • the method can provide before or after inserting the OLED plate 02 into the recess of the mold 04, to cover the electrical connections of the OLED 20 of the OLED plate 02 with a subsequently removable cover and thereby protect and of which in a later Process step in which the OLED plate 02 is encapsulated with initially liquid plastic and / or encapsulated to keep plastic filled in the recess.
  • the method may alternatively or additionally provide, if appropriate, to introduce electrical connections of the OLED 02 of the OLED wafer 02 connected or connectable interconnects in the recess, which then in a later process step, in which the OLED plate 02 with initially liquid plastic encapsulated and / or is encapsulated, also be encapsulated and / or encapsulated by the plastic.
  • the method for the simultaneous formation of printed conductors on or in the plastic holder 03 produced by encapsulation and / or encapsulation of the OLED wafer 02 with initially liquid plastic can provide one or more methods of MID technology, such as two-component injection molding, MID hot stamping, laser Direct structuring, subtractive laser structuring, mask exposure methods, film back-injection, melting of a continuously fed copper wire and spraying onto the substrates with compressed air.
  • the electrical connections of the OLED 20 can be connected after the production of the conductor tracks, for example by wire bonding or ACF bonding with at least a portion of the conductor tracks.
  • the lamp 01 comprises a plurality of OLED plates 02, they are preferably spaced apart from each other and at least separated from each other by a web of the plastic holder 03.
  • the invention provides a plastic-technical recording of glass bodies or bodies that contain glass parts or at least partially transparent or semi-transparent plastics, in particular OLEDs 20, preferably in vehicle lights.
  • the recording takes place here by means of a Kunststoffumg discern- and / or -umspritzreaes.
  • the at least on its front side 21 and / or back 22, for example, provided with glass plates for their encapsulation and thereby a glass body in the sense of the preceding embodiment performing OLED 20 is held by means of a Umg vision mixes and / or Umspritzrea with plastic and can thus to other parts of the vehicle lamp be tethered or be.
  • Fig. 1 to Fig. 6 show the structure with a not completely bordered OLED.
  • the advantage here is a filigree and therefore higher-quality appearance.
  • a part of the edge 23 representing a glass edge 24 is exposed.
  • This can z. B. be used for other lighting functions, such as a side marker light function whose main radiation angle range is rotated 90 ° to the main emission of a tail light function. Therefore, the light extraction at this glass edge 24 can be used for another function.
  • the encapsulation and / or encapsulation of the OLED plate 02 can be done over the entire surface, wherein the back 22 of the OLED plate 02 is included in the plastic holder 03 with.
  • the plastic holder 03 may further ring-shaped, C-shaped or in another encompassing shape, as in Fig. 7 and Fig. 8 is shown executed.
  • an encapsulation or Umg cordung excluding the edge 23 of an OLED plate 02 as in Fig. 8 can be advantageously used an effect of slight shrinkage of the initially liquid plastic during its solidification in order to hold the OLED plate safely.
  • the plastic holder 03 can be executed by means of encapsulation and / or encapsulation or by a combination of both.
  • the plastic holder 03 may also support the OLED wafer 02 at least partially on its front side 21 and / or rear side 22 and / or at least partially grip the OLED wafer 02 on the edge 23.
  • the disadvantage here is that the lighting electronics must provide the higher forward voltage.
  • organic layers can be damaged irreversibly, so that they are no longer excitable to the light emission and the OLED 20 is thus destroyed photometrically.
  • thermal stresses in the OLED plate are reduced or even avoidable.
  • the invention is particularly industrially applicable in the field of production of vehicle lights, in particular vehicle lights, and components of vehicle lights, such as light sources and / or one or more electronic components and / or light sources comprehensive bulbs.
EP15186481.6A 2015-09-23 2015-09-23 Une source lumineuse pour phares de vehicules comprenant delo et son procede de fabrication Withdrawn EP3147554A1 (fr)

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EP15186481.6A EP3147554A1 (fr) 2015-09-23 2015-09-23 Une source lumineuse pour phares de vehicules comprenant delo et son procede de fabrication

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3825603A1 (fr) * 2019-11-22 2021-05-26 Toshiba Lighting & Technology Corporation Phare de véhicule et lampe de véhicule

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DE20207799U1 (de) 2002-05-17 2002-08-22 Fer Fahrzeugelektrik Gmbh Signalleuchte für Fahrzeuge
DE102005024838A1 (de) 2005-05-27 2006-11-30 Johnson Controls Headliner Gmbh Beleuchtung für den Innen- oder Außenbereich eines Fahrzeuges mit einer OLED
DE102007021179A1 (de) 2007-05-05 2008-11-06 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kraftfahrzeugleuchte
US20090262545A1 (en) * 2008-04-21 2009-10-22 Joerg Amelung Illumination Apparatus and Method of Producing a Planar Light Output
DE102009009087A1 (de) 2009-02-14 2010-08-19 Hella Kgaa Hueck & Co. Beleuchtungseinrichtung für ein Kraftfahrzeug
WO2010116300A1 (fr) * 2009-04-08 2010-10-14 Koninklijke Philips Electronics N. V. Dispositif delo à apparence esthétique
US20110089811A1 (en) 2001-12-28 2011-04-21 Semiconductor Energy Laboratory Co., Ltd. Method for fabricating a semiconductor device
EP2592331A1 (fr) 2011-11-09 2013-05-15 Valeo Vision Dispositif d'éclairage et/ou de signalisation d'un véhicule automobile comprenant une source surfacique de lumière
KR20130088531A (ko) * 2012-01-31 2013-08-08 에스엘 주식회사 판형 광원 패널을 이용한 광학 장치 및 이를 포함하는 차량용 램프

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Publication number Priority date Publication date Assignee Title
US20110089811A1 (en) 2001-12-28 2011-04-21 Semiconductor Energy Laboratory Co., Ltd. Method for fabricating a semiconductor device
DE20207799U1 (de) 2002-05-17 2002-08-22 Fer Fahrzeugelektrik Gmbh Signalleuchte für Fahrzeuge
DE102005024838A1 (de) 2005-05-27 2006-11-30 Johnson Controls Headliner Gmbh Beleuchtung für den Innen- oder Außenbereich eines Fahrzeuges mit einer OLED
DE102007021179A1 (de) 2007-05-05 2008-11-06 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kraftfahrzeugleuchte
US20090262545A1 (en) * 2008-04-21 2009-10-22 Joerg Amelung Illumination Apparatus and Method of Producing a Planar Light Output
DE102009009087A1 (de) 2009-02-14 2010-08-19 Hella Kgaa Hueck & Co. Beleuchtungseinrichtung für ein Kraftfahrzeug
WO2010116300A1 (fr) * 2009-04-08 2010-10-14 Koninklijke Philips Electronics N. V. Dispositif delo à apparence esthétique
EP2592331A1 (fr) 2011-11-09 2013-05-15 Valeo Vision Dispositif d'éclairage et/ou de signalisation d'un véhicule automobile comprenant une source surfacique de lumière
KR20130088531A (ko) * 2012-01-31 2013-08-08 에스엘 주식회사 판형 광원 패널을 이용한 광학 장치 및 이를 포함하는 차량용 램프

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3825603A1 (fr) * 2019-11-22 2021-05-26 Toshiba Lighting & Technology Corporation Phare de véhicule et lampe de véhicule

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