WO2021219285A1 - Vitre de véhicule comprenant un dispositif électroluminescent et un filtre d'élimination de bande optique - Google Patents

Vitre de véhicule comprenant un dispositif électroluminescent et un filtre d'élimination de bande optique Download PDF

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Publication number
WO2021219285A1
WO2021219285A1 PCT/EP2021/056292 EP2021056292W WO2021219285A1 WO 2021219285 A1 WO2021219285 A1 WO 2021219285A1 EP 2021056292 W EP2021056292 W EP 2021056292W WO 2021219285 A1 WO2021219285 A1 WO 2021219285A1
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WO
WIPO (PCT)
Prior art keywords
pane
stop filter
band
electroluminescent device
layers
Prior art date
Application number
PCT/EP2021/056292
Other languages
German (de)
English (en)
Inventor
Klaus Fischer
Jan Hagen
Roberto ZIMMERMANN
Original Assignee
Saint-Gobain Glass France
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 Saint-Gobain Glass France filed Critical Saint-Gobain Glass France
Priority to CN202180001594.6A priority Critical patent/CN113905887A/zh
Publication of WO2021219285A1 publication Critical patent/WO2021219285A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • B32B17/10201—Dielectric coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10339—Specific parts of the laminated safety glass or glazing being colored or tinted
    • B32B17/10348—Specific parts of the laminated safety glass or glazing being colored or tinted comprising an obscuration band
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/1044—Invariable transmission
    • B32B17/10449—Wavelength selective transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10541—Functional features of the laminated safety glass or glazing comprising a light source or a light guide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/42—Layered products comprising a layer of synthetic resin comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/60—Instruments characterised by their location or relative disposition in or on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/2661—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic mounted on parts having other functions
    • B60Q1/268—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic mounted on parts having other functions on windscreens or windows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • G02B5/285—Interference filters comprising deposited thin solid films
    • G02B5/286—Interference filters comprising deposited thin solid films having four or fewer layers, e.g. for achieving a colour effect
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • G02B5/285—Interference filters comprising deposited thin solid films
    • G02B5/288—Interference filters comprising deposited thin solid films comprising at least one thin film resonant cavity, e.g. in bandpass filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on an electrochromic effect
    • G02F1/153—Constructional details
    • G02F1/1533—Constructional details structural features not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/20—Optical features of instruments
    • B60K2360/33—Illumination features
    • B60K2360/332—Light emitting diodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/77—Instrument locations other than the dashboard
    • B60K2360/785—Instrument locations other than the dashboard on or in relation to the windshield or windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/20—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for lighting specific fittings of passenger or driving compartments; mounted on specific fittings of passenger or driving compartments
    • B60Q3/208—Sun roofs; Windows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F21Y2115/15—Organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
    • G02B2027/0114—Head-up displays characterised by optical features comprising device for genereting colour display comprising dichroic elements

Definitions

  • the invention relates to a vehicle window with an electroluminescent device and an optical band-stop filter, as well as a vehicle equipped therewith.
  • the electroluminescent devices can, depending on the application, be designed as flat light sources in the manner of an LED or OLED or in the form of individual light emitting diodes (LEDs).
  • a flat light source can be introduced into the thermoplastic intermediate layer of a composite pane, for example in the form of an electroluminescent film.
  • Discrete light-emitting diodes can, for example, also be embedded in the thermoplastic intermediate layer of a composite pane or attached to one of the individual panes of the composite pane.
  • Vehicle windows with electroluminescent devices are known, for example, from DE102016209914, WO2017203132 or WO2017103426.
  • the electroluminescent devices have an intended direction of radiation, which is mostly directed into the vehicle interior.
  • vehicle roof panes are known whose electroluminescent devices are used to illuminate the vehicle interior.
  • Windshields are also known whose electroluminescent devices are used to generate a display for the driver.
  • the radiation from electroluminescent devices is, however, not or only to a small extent directed. It is therefore common to all of these applications that the electroluminescent device not only radiate in the intended direction of emission, but also in the opposite direction. If the electroluminescent devices are arranged in the field of vision of the vehicle window, the undesired radiation cannot be prevented by opaque elements such as, for example, a peripheral masking print. The radiation in the undesired direction is then at least disruptive, if not completely unacceptable for the user.
  • WO2017103426A1 discloses a vehicle window with an electroluminescent device.
  • a color filter can be present in the emission direction of the electroluminescent device to filter out parts of the white radiation from the electroluminescent device filter out and thereby provide the radiation with a color.
  • the color filter can be designed as a dielectric interference filter from alternating optically high and low refractive layers. In the opposite direction, radiation is prevented by an opaque cover print.
  • US20150228696A1 discloses another vehicle window with an electroluminescent device. US20150228696A1 also teaches that radiation in the undesired direction can be prevented by a reflective element.
  • the reflective element can be designed as a metal-containing coating or as a dielectric mirror.
  • WO2014029536A1 discloses a vehicle window with a switchable functional element, which can be an electroluminescent device, for example.
  • the vehicle window has an IR-reflecting coating in order to protect the functional element from being impaired by infrared components of the solar radiation.
  • DE102017003621A1 discloses a further vehicle window with an electroluminescent device, the radiation in the undesired direction being prevented by an opaque cover print.
  • the present invention is based on the object of providing a vehicle window with an electroluminescent device in which the radiation in the undesired emission direction is prevented or at least significantly reduced.
  • the invention is based on the combination of an electroluminescent device with an optical band-stop filter.
  • the band-stop filter is matched to the radiation of the electroluminescent device with regard to its optical properties and is arranged so as to overlap with the electroluminescent device that radiation into the external environment or into the vehicle interior is prevented.
  • the band-stop filter is designed as a thin-film coating that acts as an interference filter. The band-stop filter can thus be set very precisely with regard to its optical properties and optically can be inconspicuously integrated into the vehicle window.
  • the vehicle window according to the invention is designed as a composite window. It comprises an outer pane and an inner pane, which are connected to one another via a thermoplastic intermediate layer.
  • the vehicle window is intended to separate the vehicle interior from the external environment in a window opening of a vehicle.
  • the term “inner pane” refers to the pane of the vehicle pane that faces the interior space in the installed position.
  • the outer pane is the term used to describe the pane facing the external environment.
  • the outer pane and the inner pane each have an outer and an inner surface and a circumferential side edge running between them.
  • the outside surface denotes that main surface which is intended to face the external environment in the installed position.
  • the interior-side surface denotes that main surface which is intended to face the interior in the installed position.
  • the interior surface of the outer pane and the outer surface of the inner pane face one another and the thermoplastic intermediate layer and are connected to one another by the thermoplastic intermediate layer.
  • the intermediate layer of the vehicle window is formed by at least one layer of thermoplastic material (connecting material).
  • the intermediate layer can consist of this one layer of thermoplastic material and be formed, for example, from a single polymer film or cast resin layer.
  • the intermediate layer can, however, also comprise a plurality of layers of thermoplastic material and, for example, be formed from a plurality of polymer films arranged flat on top of one another.
  • the vehicle window is equipped with an electroluminescent device.
  • the electroluminescent device can also be referred to as an electroluminescent device.
  • the electroluminescent device is preferably monochromatic, that is to say only emits radiation of one color, in contrast to multicolored devices. Monochromatic radiation can be blocked particularly efficiently by the band-stop filter because it is typically optimized for one color. In case of For multi-colored electroluminescent devices, multiple notch filters can be used.
  • the electroluminescent device can be designed, for example, as an electroluminescent film, in particular in the manner of an LED or OLED (organic light emitting diode) and represent a flat light source.
  • An electroluminescent film comprises an active layer which contains electroluminescent material and which is contacted on both sides by a transparent electrode layer (for example made of silver or ITO), as well as electrically insulating carrier layers as outer layers, between which the active layer with the electrodes is enclosed.
  • the electroluminescent device can alternatively be formed, for example, from a plurality of light-emitting diodes, which then form discrete, approximately point-shaped light sources. All light-emitting diodes preferably have the same emission color.
  • the electroluminescent device emits electromagnetic radiation in the visible spectral range through electrical excitation.
  • the electroluminescent device is preferably arranged in the see-through area of the pane, which is not provided with additional opaque elements.
  • the invention is particularly advantageous there.
  • the vehicle window is also provided with an optical band-stop filter.
  • the optical band-stop filter is designed as a thin-film coating made of optically high-index layers and optically low-index layers.
  • the optically high-index layers have a refractive index greater than 1.8
  • the optically low-index layers have a refractive index less than 1.8.
  • details of the refractive index relate to a wavelength of 550 nm.
  • the optically high-index layers and optically low-index layers are arranged alternately, that is, alternately one above the other.
  • the thin-film coating preferably comprises n optically high-index layers with a refractive index greater than 1.8 and n optically low-index layers with a refractive index less than 1.8, where n is a natural number greater than or equal to 1.
  • the thin-film coating particularly preferably consists of n optically low-index layers and (n + 1) optically high-index layers, which are each arranged alternately.
  • the top and bottom layers of the coating are correspondingly optically highly refractive layers. This achieves the best interference effects.
  • the thin-film coating consists of n optically low-refractive layers and n optically high-refractive layers or from (n + 1) optically low-refractive layers and n optically high-refractive layers, even if the interference effect is generally weaker as a result.
  • An optical band-stop filter is an optical filter that blocks the transmission of electromagnetic radiation in a certain spectral range, i.e. significantly attenuates it (especially as a result of reflection), while electromagnetic radiation with smaller and larger wavelengths is largely transmitted, i.e. only slightly or insignificantly is weakened.
  • the said spectral range within which the radiation is blocked is referred to as the blocking range.
  • the band-stop filter is, as it were, the complementary counterpart of an optical band-pass filter.
  • the optical properties of the band-stop filter can be quantitatively described by a number of parameters that are used in the context of the present invention as follows:
  • the central wavelength indicates the center point of the blocking range.
  • the minimum transmission indicates the smallest transmission value that occurs within the blocking range.
  • the block depth describes the difference between the transmission value, which occurs at the local transmission maxima adjacent to the blocking area, and the
  • the width of the restricted area is known as the bandwidth and can be described as the half-width.
  • the upper and lower limit of the bandwidth is defined as the wavelength at which the filter reaches 50% of the block depth, i.e. at which a transmission value occurs that is 50% of the block depth plus the minimum transmission.
  • the slope describes the spectral range over which the filter changes from high blocking to high transmission. At both limits of the stop range, a slope can be determined as the spectral range between the wavelength at which
  • the transmission value is 80% of the block depth plus the minimum transmission
  • the wavelength at which 10% of the block depth is reached is 10% of the block depth plus the minimum transmission.
  • the degree of transmission is measured within the meaning of the invention with an angle of incidence of 0 ° to the surface normal.
  • the radiation which is emitted by the electroluminescent device lies in the stop range of the optical band-stop filter.
  • the mean wavelength of the electroluminescent radiation is "within the bandwidth (half-width) of the band-stop filter", i.e. the difference between the central wavelength of the band-stop filter and the mean wavelength of the electroluminescent radiation is less than half the half-width of the band stop filter is.
  • the mean wavelength of the electroluminescent radiation is then in the stop range of the band-stop filter.
  • the half width of the band stop filter should be greater than the half width of the electroluminescent spectrum of the electroluminescent device.
  • the sum of half the width at half maximum of the electroluminescent radiation and the difference between the central wavelength of the band-stop filter and the mean wavelength of the electroluminescent radiation is preferably less than half the width at half height of the band-stop filter. This achieves a particularly good blocking effect.
  • the minimum transmission of the band stop filter is preferably less than 20%.
  • the half width of the band stop filter (more precisely: the stop range of the band stop filter) is preferably at least 10 nm, for example from 10 nm to 50 nm, particularly preferably from 20 nm to 50 nm, very particularly preferably from 20 nm to 30 nm % of the radiation from the electroluminescent device (more precisely the intensity of the radiation emitted in the direction of the band-stop filter) is not transmitted by the band-stop filter, particularly preferably at least 70%.
  • the stop range of the band stop filter is in the visible spectral range from 380 nm to 780 nm.
  • the stop range of the band stop filter is preferably completely in the visible spectral range, so that it does not extend beyond the limits of the visible spectral range.
  • the blocking range does not cover the entire visible spectral range, but preferably has a half-width in the range mentioned above.
  • the optical band-stop filter is arranged in or on the vehicle window in such a way that the emission of the electroluminescent device via the outer window or beyond the inner window is blocked, that is to say prevented or at least significantly reduced.
  • the emission of the electroluminescent device via a pane, selected from an outer pane and an inner pane, is therefore blocked by the band-stop filter.
  • the electroluminescent device emits into the environment via the other pane, selected from the outer pane and the inner pane.
  • the radiation through said other pane is not prevented (for example by an opaque element such as a cover print) or is significantly specifically weakened (for example by a band-stop filter).
  • the radiation from elements of the vehicle window which do not specifically act on the radiation of the electroluminescent device can nevertheless be attenuated slightly, for example by the window itself or a coating located thereon.
  • the band-stop filter preferably allows at most 50% of the incident radiation from the electroluminescent device to pass, that is to say the degree of blocking is at least 50%.
  • the band-stop filter and the electroluminescent device are superimposed when looking through the vehicle window, which means that the orthogonal projection of the electroluminescent device on the plane of the band-stop filter is arranged completely within the band-stop filter.
  • the optical band-stop filter can be arranged on the outside or on the inside of the electroluminescent device.
  • the arrangement of the band-stop filter on the outside means in the context of the invention that the band-stop filter is arranged closer to the external environment of the vehicle in the installed position than the electroluminescent device, that is to say has a smaller distance from the external environment. This case occurs when the intended direction of radiation is directed into the vehicle interior. The emission of the electroluminescent device into the external environment, that is to say beyond the outer pane, is then prevented or at least reduced.
  • the interior-side arrangement of the band-stop filter in the context of the invention means that the band-stop filter is arranged closer to the vehicle interior when installed than the electroluminescent device, ie has a smaller distance from the vehicle interior. This case occurs when the intended direction of radiation is directed into the external environment. The emission of the electroluminescent device into the vehicle interior, that is to say beyond the inner pane, is then prevented or at least reduced.
  • the electroluminescent device is arranged on the interior surface of the inner pane.
  • the band-stop filter is arranged on the outside surface of the inner pane, inside the intermediate layer, on the inside surface of the outer pane or on the outside surface of the outer pane.
  • the electroluminescent device is on the outside surface of the
  • the band-stop filter is arranged within the intermediate layer, on the surface of the outer pane on the inside or on the surface of the outer pane on the outside.
  • the electroluminescent device is arranged within the intermediate layer.
  • the band-stop filter is inside the intermediate layer between electroluminescent
  • the electroluminescent device is arranged on the surface of the outer pane on the inside.
  • the band-stop filter is arranged on the outside surface of the outer pane.
  • the band-stop filter is arranged on the interior side with respect to the electroluminescent device, the following configurations are possible in particular:
  • the electroluminescent device is arranged on the outside surface of the inner pane.
  • the band-stop filter is on the interior surface of the
  • Inner pane arranged.
  • the electroluminescent device is arranged within the intermediate layer.
  • Band stop filter is inside the interlayer between electroluminescent
  • the electroluminescent device is arranged on the surface of the outer pane on the inside.
  • the band-stop filter is arranged within the intermediate layer, on the outside surface of the inner pane or on the inside surface of the inner pane. -
  • the electroluminescent device is on the outside surface of the
  • the band-stop filter is arranged on the inside surface of the outer pane, inside the intermediate layer, on the outside surface of the inner pane or on the inside surface of the inner pane.
  • this configuration is less preferred because it is electroluminescent Device is exposed to adverse effects from the external environment largely unprotected and in particular can be easily damaged.
  • the thin-layer coating is usually deposited on a carrier film which is arranged between two layers of thermoplastic connecting material.
  • the carrier layer is, for example, a film based on polyethylene terephthalate (PET) with a thickness of 10 ⁇ m to 100 ⁇ m.
  • the electroluminescent device can likewise be arranged on a carrier film which is arranged between two layers of thermoplastic connecting material.
  • a carrier film which is arranged between two layers of thermoplastic connecting material.
  • a plurality of light-emitting diodes with their electrodes can be arranged on the carrier film.
  • An electroluminescent device designed as an electroluminescent film can also be arranged between two layers of thermoplastic connecting material.
  • light-emitting diodes can also be melted directly into the thermoplastic connecting material, for example via the interface between two layers of thermoplastic connecting material.
  • the electroluminescent device is arranged on a surface of one of the panes, it can be attached to the flat surface and, for example, be fixed there by means of an adhesive or pressed onto it by the thermoplastic intermediate layer (provided that it is a surface facing the intermediate layer). If the electroluminescent device is designed in the form of individual light-emitting diodes, these can also be attached in recesses in the surface, which are designed, for example, as bores in the pane.
  • an electroluminescent device for example an LED or a light fiber
  • the radiation is coupled into the corresponding pane via the side edge and spreads within the pane as a result of total reflection on the surfaces.
  • the pane is then provided with a light-scattering structure, for example a screen print or a roughened area, at which the radiation is coupled out from the pane.
  • the light-scattering structure then forms the perceptible luminous area.
  • the invention can also be applied to such vehicle windows, the positioning of the band-stop filter then not correspondingly being adjusted the position of the actual electroluminescent device, but rather the position of the light-scattering structure.
  • the band-stop filter and the light-scattering structure are superimposed when looking through the vehicle window, which means that the orthogonal projection of the light-scattering structure onto the plane of the band-stop filter is arranged completely within the band-stop filter.
  • the optical band-stop filter can be arranged on the outside or on the inside of the light-scattering structure.
  • the invention is suitable for a variety of technical applications, including the following:
  • the electroluminescent device is designed to radiate outwards in order to prevent a view through the vehicle window (“privacy” window).
  • the electroluminescent device is in particular an electroluminescent film and the band-stop filter is arranged on the inside of the electroluminescent device.
  • the electroluminescent film is preferably incorporated into the intermediate layer.
  • the vehicle window is preferably a vehicle roof window.
  • the electroluminescent device is designed to radiate inward to form a display element.
  • the electroluminescent device is in particular an electroluminescent film or a plurality of light-emitting diodes.
  • the band-stop filter is arranged on the outside of the electroluminescent device.
  • the electroluminescent device is preferably arranged between the outer pane and the inner pane, as being embedded in the intermediate layer or arranged on one of the surfaces of the panes facing one another.
  • the vehicle window is preferably a windshield.
  • the electroluminescent device is intended to shine inwards as a light source in order to illuminate the vehicle interior.
  • the electroluminescent device is in particular a plurality of light-emitting diodes.
  • the band-stop filter is arranged on the outside of the electroluminescent device.
  • the vehicle window is preferably a vehicle roof window.
  • the optical band-stop filter is designed as a sequence of thin layers, with optically high-refractive and optically low-refractive layers being arranged alternately on top of one another.
  • the optical band-stop filter is an interference filter, with radiation passing through the filter as a result of interference effects depending on the radiation Wavelength is either (mainly) reflected or (mainly) transmitted.
  • the interference is based on reflections of the radiation at the interfaces of the individual layers, which leads to a multiple superposition of the radiation. Depending on the optical path length between the interfaces, at a given wavelength, the interference is either constructive or destructive, on which the filter effect is based.
  • the optical band-stop filter can be provided with the properties required for the application through the structure of the thin-film stack.
  • the refractive index of the materials of the individual layers, the thickness of the individual layers and the total number of individual layers play a role here.
  • the refractive index and the geometric thickness of the individual layers influence in particular the central wavelength of the band stop filter, i.e. the spectral position of the stop band.
  • band-stop filters with low minimum transmission, high block depth and with a low gradient can be produced from a large number of individual layers.
  • the bandwidth is also influenced by the number of layers, with a higher number of layers leading to a lower bandwidth.
  • the thin-film stack of the band-stop filter typically contains dielectric, optically high-index layers.
  • dielectric, optically high-index layers can, for example, be based on silicon nitride (S1 3 N 4 ), a silicon-metal mixed nitride (such as silicon zirconium nitride, silicon-aluminum mixed nitride, silicon-hafnium mixed nitride or silicon-titanium mixed nitride), aluminum nitride, titanium oxide, tin oxide, tin Zinc oxide, zirconium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, manganese oxide, bismuth oxide or silicon carbide can be formed. Silicon nitride, silicon-metal mixed nitride (in particular silicon zirconium nitride) and titanium oxide are preferred because of their good optical properties, their durability and their good separability, in particular by vapor deposition.
  • the thin-film stack of the band-stop filter typically contains dielectric, optically low-refractive-index layers and / or electrically conductive, optically low-refractive-index layers.
  • Dielectric, optically low-refractive-index layers can be formed, for example, on the basis of silicon oxide (S1O 2 ), aluminum oxide, magnesium fluorite, silicon oxynitride or calcium fluorite. Silicon oxide is preferred because of its good optical properties, its durability and good separability.
  • the materials mentioned can be deposited stoichiometrically, substoichiometrically or overstoichiometrically.
  • the materials can have doping, in particular aluminum, boron, zirconium or titanium. The doping can provide the materials with a certain electrical conductivity.
  • the material of the dielectric layers preferably has an electrical conductivity (reciprocal of the specific resistance) of less than 10 4 S / m.
  • the material of the electrically conductive layers preferably has an electrical conductivity of greater than 10 4 S / m.
  • the refractive index of the optically high-index layers is preferably at least 2.0, the refractive index of the optically low-index layers is preferably at most 1.6, particularly preferably at most 1.5.
  • all optically high-index and low-index layers of the band-stop filter are designed as dielectric layers.
  • the thin-film coating then forms a so-called dielectric superlattice.
  • the dielectric superlattice can also be understood physically as a Bragg mirror.
  • the aforementioned materials are particularly suitable.
  • silicon nitride, silicon-metal mixed nitride in particular
  • Silicon zirconium nitride) and titanium oxide, silicon nitride is particularly preferred.
  • the optical thicknesses of the individual layers depend, in particular, on the desired spectral position of the cut-off region, which in turn depends on the emission wavelength of the electroluminescent device at the point of incidence.
  • the optical thickness of the optically high-index layers is preferably from 10 nm to 30 nm. These optical thicknesses can be achieved, for example, with high-index layers based on silicon nitride (refractive index 2.04) with geometric thicknesses of approximately 5 nm to 15 nm.
  • the aforementioned materials are particularly suitable for the optically low-index dielectric layers. Silicon oxide is preferred.
  • the optical thickness of the optically low-index layers is preferably from 150 nm to 400 nm. These optical thicknesses can be achieved, for example, with low-index layers based on silicon oxide (refractive index 1.47) with geometric thicknesses of approximately 100 nm to 270 nm.
  • the superlattice comprises n optically high-index layers and n optically low-index layers, where n is a natural number greater than or equal to 1.
  • the superlattice is preferably made up of (n + 1) optically high-index layers and n optically low-index layers, so that the top and bottom layers are optically high-index layers.
  • n is at least 5, particularly preferably at least 10, very particularly preferably at least 15. This makes it possible to achieve advantageous and useful optical properties.
  • N is preferably from 5 to 50, very particularly preferably from 10 to 30 and in particular from 15 to 25. These ranges represent good compromises with regard to the optical properties of the band-stop filter on the one hand and the simplest possible layer structure on the other. There are preferably no further layers.
  • the optically low-refractive-index layers of the band-stop filter are designed as electrically conductive layers.
  • the optically high-index layers and, if present, the other optically low-index layers are designed as dielectric layers.
  • the thin-film coating then forms a so-called Fabry-Perot interferometer.
  • interference effects occur after the reflection of the radiation passing through at the interfaces, in particular the highly reflective, electrically conductive layers, on which the filter effect is based.
  • a bandstop filter in the manner of a Fabry-Perot interferometer has the advantage over the bandstop filter in the manner of a dielectric superlattice that comparable optical properties can be achieved with a smaller number of individual layers.
  • the band-stop filter In addition to the main blocking range in the visible spectrum, it is also possible to generate a further blocking range, for example in the infrared (IR) range, so that the band-stop filter also functions as a sun protection coating (IR-reflecting coating).
  • IR-reflecting coating IR-reflecting coating
  • a disadvantage of the Fabry-Perot interferometer compared to the dielectric superlattice is the fact that many electrically conductive layers are susceptible to corrosion, for example silver layers. In this case, the use of the Fabry-Perot interferometers on an external surface of the inner pane or the outer pane facing away from the intermediate layer can be avoided. In addition, due to the absorption by the conductive layers, the Fabry-Perot interferometer reduces the total light transmission more than the superlattice.
  • the electrically conductive layers can be metal-containing layers, for example based on silver (Ag), gold, copper, aluminum, or layers based on a transparent conductive oxide (TCO), for example indium tin oxide (ITO).
  • the electrically conductive layers are preferably formed on the basis of silver.
  • the conductive layers preferably contain at least 90% by weight of silver, particularly preferably at least 99% by weight of silver, very particularly preferably at least 99.9% by weight of silver. This achieves particularly good results.
  • the silver layers preferably have a geometric thickness of 2 nm to 10 nm. In this area they have sufficient reflective properties to guarantee the interference effects, so that they do not have to be made thicker.
  • all low refractive index layers can be designed as electrically conductive layers, an optically high refractive index dielectric layer being arranged between adjacent conductive layers.
  • the low refractive index layers are preferably designed as electrically conductive layers, while the remaining low refractive index layers are designed as dielectric layers.
  • a regular structure is particularly preferred, so that the same number of dielectric layers is arranged between all adjacent conductive layers.
  • every second low-refractive-index layer can be designed as a conductive layer, so that a dielectric low-refractive-index layer and two high-refractive-index dielectric layers are arranged between adjacent conductive layers.
  • the aforementioned materials are particularly suitable for the dielectric layers.
  • Silicon nitride, silicon-metal mixed nitride (in particular silicon zirconium nitride) and titanium oxide for the high-refractive-index layers and silicon oxide for the low-refractive-index layers are particularly preferred due to the separability. Titanium oxide achieves a particularly good anti-reflective coating on the conductive layers.
  • the Fabry-Perot interferometer comprises n optically high-index layers and n optically low-index layers, where n is a natural number greater than or equal to 1.
  • Preferred the Fabry-Perot interferometer is made up of (n + 1) optically high-index layers and n optically low-index layers, so that the top and bottom layers are optically high-index layers.
  • n is at least 3, particularly preferably at least 5, very particularly preferably at least 7.
  • Advantageous and useful optical properties can thus be achieved.
  • n is from 3 to 20, very particularly preferably from 5 to 15 and in particular from 7 to 12. These ranges represent good compromises with regard to the optical properties of the band-stop filter on the one hand and the simplest possible layer structure with high light transmission on the other. There are preferably no further layers.
  • the Fabry-Perot interferometer comprises a plurality of electrically conductive layers, in particular based on silver, with a dielectric layer or dielectric layer sequence being arranged between adjacent conductive layers and above the top conductive layers and below the bottom conductive layer.
  • Dielectric layer sequences are made up of m optically low-refractive layers and (m + 1) optically high-refractive layers, which are arranged alternately so that an optically low-refractive layer is arranged between two adjacent high-refractive layers.
  • the number m is a natural number greater than or equal to 1.
  • Individual dielectric layers between adjacent conductive layers, above the uppermost conductive layers or below the lowermost conductive layer are preferably optically highly refractive layers.
  • the number m can be selected independently for each dielectric layer sequence, but is preferably the same for all layer sequences. Particularly preferably, m is equal to 1.
  • a dielectric layer sequence is preferably in each case arranged between all adjacent conductive layers.
  • the number of conductive layers is preferably at least 3, particularly preferably from 3 to 7.
  • the optical thicknesses of the individual dielectric layers depend, in particular, on the desired spectral position of the cut-off region, which in turn depends on the emission wavelength of the electroluminescent device upon incident.
  • the optical thickness of the optically high-index layers is preferably from 30 nm to 300 nm. These optical thicknesses can, for example, with high-index layers based on titanium oxide (refractive index 2.8) with geometric thicknesses of about 10 nm to 100 nm or with high-index layers based of silicon nitride (refractive index 2.04) with geometric thicknesses of about 15 nm to 150 nm can be achieved.
  • the optical thickness of the dielectric, optically low-index layers is preferably from 150 nm to 400 nm. These optical thicknesses can be achieved, for example, with low-index layers based on silicon oxide (refractive index 1.47) with geometric thicknesses of approximately 100 nm to 270 nm.
  • first layer is arranged above a second layer, this means in the context of the invention that the first layer is arranged further away from the substrate on which the coating is applied than the second layer. If a layer is formed on the basis of a material, the layer consists mainly of this material in addition to any impurities or doping.
  • the electroluminescent device is designed as an electroluminescent film which is arranged between the outer pane and the inner pane.
  • the arrangement between the outer pane and the inner pane closes the case in which the electroluminescent device is arranged directly on one of the mutually facing surfaces of the outer or inner pane.
  • the electroluminescent film is preferably embedded in the thermoplastic intermediate layer and arranged there between two layers of thermoplastic connecting material, which ensures a stable connection between the electroluminescent film and the two panes.
  • the optical band-stop filter is arranged on the inside of the electroluminescent film, in particular on the outside surface of the inner pane, on the inside surface of the inner pane or within the intermediate layer between the electroluminescent film and the inner pane.
  • the intended direction of emission of the electroluminescent device is directed into the external environment, while the emission via the inner pane into the vehicle interior is prevented by the band-stop filter.
  • vehicle panes are used as so-called “privacy” panes, with the view from outside into the vehicle interior being prevented or at least made more difficult by the radiation from the electroluminescent film, which represents a flat light source.
  • the vehicle window is particularly preferably a vehicle roof window.
  • the electroluminescent device is designed as an electroluminescent film which is arranged between the outer pane and the inner pane.
  • the electroluminescent film is preferably on the outside Surface of the inner pane arranged or embedded in the thermoplastic intermediate layer.
  • the optical band-stop filter is arranged on the outside of the electroluminescent film, in particular on the outside surface of the outer pane, on the inside surface of the outer pane or within the intermediate layer between the electroluminescent device and the outer pane.
  • the intended direction of emission of the electroluminescent device is directed into the vehicle interior, while the emission via the outer pane into the outside environment is prevented by the band-stop filter.
  • the electroluminescent device can be used in such a vehicle window as a display element (display) in order to display information, in particular for the driver (for example in the manner of a head-up display).
  • the vehicle window is particularly preferably a windshield.
  • a display element can also be formed from a plurality of light-emitting diodes, in particular light-emitting diodes of the same color.
  • the electroluminescent device can, however, also serve as a flat light source for illuminating the vehicle interior - the vehicle window is then particularly preferably a vehicle roof window.
  • the electroluminescent device comprises a plurality of light-emitting diodes which are arranged on the (planar) interior-side surface of the inner pane or in recesses in the interior-side surface of the inner pane.
  • the main emission direction of the light-emitting diodes opposite the electrical contacts faces the vehicle interior.
  • the surface of the inner pane on the inside is preferably provided with an electrically conductive coating, which is structured in particular by insulation lines and ensures the electrical contacting of the light-emitting diodes.
  • Light-emitting diodes are securely fixed on or in the pane surface, for example by using an adhesive or soldering to the conductive coating.
  • the optical band-stop filter is arranged on the outside of the light-emitting diodes, in particular on the outside surface of the outside pane, on the inside surface of the outside pane, inside the intermediate layer or on the outside surface of the inside pane.
  • the intended direction of emission of the electroluminescent device is directed into the vehicle interior, while the emission via the outer pane into the outside environment is prevented by the band-stop filter.
  • the electroluminescent device can be used in such a vehicle window as lighting for the Serve vehicle interior.
  • the vehicle window is particularly preferably a vehicle roof window.
  • the electroluminescent device comprises a plurality of light-emitting diodes which are arranged on the (planar) interior-side surface of the outer pane or in recesses in the interior-side surface of the outer pane.
  • the main emission direction of the light-emitting diodes opposite the electrical contacts faces the vehicle interior.
  • the surface of the outer pane on the inside is preferably provided with an electrically conductive coating, which is structured in particular by insulation lines and ensures the electrical contacting of the light-emitting diodes.
  • Light-emitting diodes are securely fixed on or in the pane surface, for example by using an adhesive or soldering to the conductive coating.
  • the optical band-stop filter is arranged on the outside of the light-emitting diodes, in particular on the outside surface of the outer pane.
  • the intended direction of emission of the electroluminescent device is directed into the vehicle interior, while the emission via the outer pane into the outside environment is prevented by the band-stop filter.
  • the electroluminescent device can serve as lighting for the vehicle interior in such a vehicle window.
  • the vehicle window is particularly preferably a vehicle roof window.
  • the electroluminescent device comprises a plurality of light-emitting diodes which are arranged between the outer pane and the inner pane.
  • the main emission direction of the light-emitting diodes opposite the electrical contacts faces the vehicle interior.
  • the optical band-stop filter is arranged on the outside of the light-emitting diodes.
  • the intended direction of emission of the electroluminescent device is directed into the vehicle interior, while the emission via the outer pane into the outside environment is prevented by the band-stop filter.
  • the electroluminescent device can also serve as lighting for the vehicle interior in such a vehicle window.
  • the vehicle window is particularly preferably a vehicle roof window.
  • the electroluminescent device can be arranged in detail: - On or in recesses in the outer surface of the inner pane, the band filter being arranged in the intermediate layer or on one of the surface of the outer pane; within the intermediate layer, for example on a carrier film, the belt filter being arranged in the intermediate layer between the electroluminescent device and the outer pane; or
  • the band filter being arranged on the outer surface of the outer pane.
  • the electrical contacting of the light-emitting diodes takes place again, for example, by means of a structured, electrically conductive coating on the respective pane surface or carrier film.
  • the electroluminescent device is designed as a plurality of light-emitting diodes and serves as lighting for the vehicle interior.
  • the light-emitting diodes are arranged on or in recesses in the interior surface of the outer pane, on or in recesses in the interior surface of the inner pane, on the outer surface of the inner pane or within the intermediate layer.
  • the optical band-stop filter is arranged on the outside of the electroluminescent device.
  • the vehicle window is preferably a vehicle roof window.
  • the light-emitting diodes can also be replaced by light-scattering structures on a pane surface, within a pane or within the intermediate layer, which is illuminated by a light source arranged on the side edge of the pane or the intermediate layer.
  • the light-scattering structures can be generated, for example, by screen printing on a pane surface or carrier film, by generating a roughened area of a pane surface by means of mechanical processing or laser processing, or within a pane by laser processing.
  • the outer pane and the inner pane are preferably made of glass, in particular soda-lime glass, which is common for window panes.
  • the panes can also be made of other types of glass (for example borosilicate glass, quartz glass, aluminosilicate glass) or transparent plastics (for example polymethyl methacrylate or polycarbonate).
  • the thickness of the outer pane and the inner pane can vary widely. Discs with a thickness in the range from 0.8 mm to 5 mm, preferably from 1.4 mm to 2.5 mm, for example those with the standard thicknesses of 1, 6 mm or 2.1 mm.
  • the thermoplastic intermediate layer comprises at least one layer of a thermoplastic connecting material which preferably contains ethylene vinyl acetate (EVA), polyvinyl butyral (PVB) or polyurethane (PU) or mixtures or copolymers or derivatives thereof, particularly preferably PVB.
  • the intermediate layer is typically formed from at least one thermoplastic film.
  • the thickness of the film is preferably from 0.3 mm to 2 mm, the standard thicknesses of 0.36 mm and 0.76 mm being particularly common.
  • the outer pane, the inner pane and the thermoplastic intermediate layer can be clear and colorless, but also tinted or colored.
  • the outer pane and the inner panes can not be preloaded, partially preloaded or preloaded independently of one another. If at least one of the disks is to have a pre-tension, this can be a thermal or chemical pre-tension.
  • the vehicle window is preferably curved in one or more directions of the space, as is customary for motor vehicle windows, typical radii of curvature being in the range from approximately 10 cm to approximately 40 m.
  • the vehicle window can also be flat, for example if it is intended as a window for buses, trains or tractors.
  • the vehicle window can be produced by methods known per se.
  • the outer pane and the inner pane are laminated to one another via the intermediate layer, for example by autoclave processes, vacuum bag processes, vacuum ring processes, calender processes, vacuum laminators or combinations thereof.
  • the connection of the outer pane and the inner pane usually takes place under the action of heat, vacuum and / or pressure. If the vehicle window is bent, the individual windows are subjected to a bending process before lamination, for example by means of gravity bending, press bending and / or suction bending.
  • the outer pane and the inner pane lying on top of one another are preferably bent congruently together (that is to say at the same time and by the same tool), because the shape of the panes is thereby optimally matched to one another for the subsequent lamination.
  • Typical temperatures for glass bending processes are, for example, 500 ° C to 700 ° C. This temperature treatment also increases the transparency and reduces the sheet resistance of the reflective coating.
  • the thin layers of the band-stop filter are preferably applied to a pane surface by physical vapor deposition (PVD), particularly preferably by cathode atomization (“sputtering”), very particularly preferably by cathode atomization supported by magnetic fields (“magnetron sputtering”).
  • dielectric superlattices can also be purchased on carrier films.
  • the coating is preferably applied to one of the panes prior to lamination and prior to any bending processes.
  • the reflective coating can in principle also be provided on a carrier film which is arranged in the intermediate layer.
  • a band-stop filter on an external surface can in principle also be applied after lamination.
  • the electroluminescent device is arranged on one of the pane surfaces or inserted into the intermediate layer. If light-emitting diodes are to be introduced into recesses in a pane surface, then these are generated through bores, for example by means of laser processing or mechanically.
  • the application of an electroluminescent device on an external surface is preferably carried out after the lamination, on an internal surface or within the intermediate layer necessarily before the lamination.
  • the invention also includes the use of a vehicle window according to the invention as a window pane of a vehicle.
  • the invention also includes a vehicle equipped with a vehicle window according to the invention.
  • the vehicle can be any land vehicle, watercraft or aircraft, is preferably a passenger car, truck or rail vehicle.
  • the invention is explained in more detail below with reference to a drawing and exemplary embodiments.
  • the drawing is a schematic representation and is not true to scale. The drawing does not restrict the invention in any way.
  • Fig. 1 shows a cross section through a first embodiment of an inventive
  • Fig. 2 shows a cross section through a second embodiment of an inventive
  • FIG. 5 shows a cross section through an inner pane with a dielectric superlattice as a band-stop filter (not claimed as such),
  • FIG. 6 shows a cross section through an inner pane with a Fabry-Perot interferometer as a band-stop filter (not claimed as such),
  • FIG. 9 transmission spectra of Examples 1, 4 and 5 according to the invention and FIG. 10 transmission spectrum of Example 6 according to the invention.
  • FIG. 1 shows an embodiment of a vehicle window according to the invention.
  • the vehicle window is a composite window which is structurally made up of an outer pane 1 and an inner pane 2, which are connected to one another via a thermoplastic intermediate layer 3.
  • the outer pane 1 faces the external environment
  • the inner pane 2 faces the vehicle interior.
  • the outer pane 1 has an outer surface I which, in the installed position, faces the external environment, and an interior surface II which, in the installed position, faces the interior.
  • the inner pane 2 has an outside surface III which, in the installed position, faces the external environment, and an inside surface IV which, in the installed position, faces the interior space.
  • the vehicle window is intended as a roof window for a passenger car. It is designed as a so-called privacy roof pane, in which a flat light source radiating outwards can prevent visibility from outside.
  • This light source is an electroluminescent film 20 which is embedded in the intermediate layer 3.
  • the electroluminescent film 20 is arranged between a first layer of thermoplastic connecting material 3a and a second layer of thermoplastic connecting material 3b.
  • the electroluminescent film 20 is connected to the outer pane 1 via the first layer of thermoplastic connecting material 3a and to the inner pane 2 via the second layer of thermoplastic connecting material 3b.
  • the outer pane 1 and the inner pane 2 consist, for example, of soda-lime glass.
  • the outer pane 1 has, for example, a thickness of 2.1 mm
  • the inner pane 2 a thickness of 2.1 mm or 1.6 mm.
  • Both layers of thermoplastic connecting material 3a, 3b are designed as films based on PVB with a thickness of 0.76 mm.
  • the electroluminescent film 20 contains an active layer of electroluminescent material in the manner of an LED or OLED, which is arranged between two carrier films.
  • the carrier films are, for example, PET films with a thickness of 50 ⁇ m.
  • An electrically conductive coating is arranged as an electrode between each carrier film and the active layer, is in electrical contact and can be connected to the on-board electrical system. By applying an electrical voltage to the electrodes, the active layer can be excited to luminescence, which activates the light source.
  • the electroluminescent film 20 emits radiation from the visible spectra I range (380 nm to 780 nm). Depending on the configuration of the active layer, radiation can be implemented in different colors.
  • electroluminescent films 20 with the standard colors red (630 nm), green (550 nm) or blue (473 nm) are customary.
  • White or almost white electroluminescent radiation can also be realized by superimposing different colors or by means of a very broadband luminescence emission.
  • the electroluminescent film 20 In addition to the desired direction of radiation via the outer pane 1 into the outer surroundings of the vehicle, the electroluminescent film 20 also emits radiation in the direction of the inner pane 2. That would get into the vehicle interior and be perceived there as annoying.
  • the outside surface III of the inner pane 2 is also included provided with a thin-film coating that acts as an optical band-stop filter.
  • the band-stop filter is matched to the emission spectrum of the electroluminescent film 20, so that it largely blocks the radiation.
  • the radiation from the electroluminescent film 20 cannot reach the vehicle interior or can only reach it with a significantly reduced intensity.
  • the band stop filter is an interference filter made up of thin layers. It can in particular be designed as a so-called dielectric superlattice 40 or as a so-called Fabry-Perot interferometer 50.
  • a dielectric superlattice 40 is built up purely from dielectric individual layers, with optically high-index layers 41 with a refractive index greater than 1.8 and optically low-index layers 42 with a refractive index less than 1.8 being arranged alternately one above the other.
  • Table 1 shows an exemplary structure of the vehicle window from FIG. 1 with a dielectric superlattice 40 as a band-stop filter, specifying the materials and layer thicknesses according to three inventive examples 1-3.
  • the superlattice 40 comprises 21 high-index layers of aluminum-doped silicon nitride (S1 3 N 4 ) and 20 layers of aluminum-doped silicon oxide (SiC> 2).
  • Table 1 Table 2 shows an exemplary structure of the vehicle window from FIG. 1 with a dielectric superlattice 40 as a band-stop filter, specifying the materials and layer thicknesses according to two further inventive examples 4-5.
  • a Fabri-Peröt interferometer 50 is also made up of alternating optically high-index and optically low-index thin layers, with at least some of the optically low-index layers being designed as electrically conductive layers 53, while the optically high-index layers 51 and the remaining optically low-index layers 52 as dielectric layers are formed.
  • Table 3 shows an exemplary structure of the vehicle window from FIG. 1 with a Fabri-Perot interferometer 50 as a band-stop filter, specifying the materials and layer thicknesses according to another example 6 according to the invention.
  • the electrically conductive layers 53 are based on silver (Ag) and are effective especially as a partially transparent mirror.
  • the high-index dielectric layers 51 are made of aluminum-doped silicon nitride (S1 3 N 4 ) and the low-index dielectric layers 52 are made of aluminum-doped silicon oxide (S1O2).
  • the selection of the layer thicknesses of the dielectric layers 51, 52 sets the optical path length between the conductive layers 53, whereby the optical properties of the band-stop filter can be adapted to the requirements of the specific application.
  • Table 3 The band-stop filter 40, 50 could alternatively also be applied to the interior surface IV of the inner pane 2. There it would be exposed to external influences to a greater extent, so that this arrangement is less preferred.
  • the band-stop filter 40, 50 could alternatively also be incorporated on a carrier film in the intermediate layer 3 between the device 20 and the inner pane 2. However, this would make the structure of the intermediate layer 3 more complex, so that this arrangement is less preferred.
  • the band-stop filter 40, 50 is applied over the entire surface of the surface III of the inner pane 2.
  • the surface III can alternatively also have an uncoated peripheral edge region in order to prevent the band-stop filter 40, 50 from coming into contact with the surrounding atmosphere. This is particularly advantageous when the band-stop filter is designed as a Fabry-Perot interferometer 50 due to the corrosion-prone silver layers. Since vehicle windows are usually provided with an opaque cover print in the edge area, the band-stop filter 40, 50 for suppressing the luminescence is not necessary there either.
  • FIG. 2 shows a further embodiment of a vehicle window according to the invention with an outer window 1, an inner window 2 and a thermoplastic intermediate layer 3.
  • the vehicle window is provided as a windshield of a passenger car.
  • the intermediate layer 3 is formed from a single PVB film with a thickness of 0.76 mm.
  • an electroluminescent film 20 is arranged on the outside surface III of the inner window 2 and is fixed to this surface III, for example by means of a thin layer of adhesive.
  • the electroluminescent film 20 is intended to shine beyond the inner pane 2 into the vehicle interior in order to serve as a display element for the driver. For example, static information can be displayed when the on-board electrical system activates the electroluminescent film 20 in response to a sensor signal.
  • a symbol can be displayed which is generated by the shape of the electroluminescent film 20 or by a masking area (for example an opaque cover print on one of the surfaces III, IV of the inner pane 2).
  • a masking area for example an opaque cover print on one of the surfaces III, IV of the inner pane 2.
  • the electrodes of the electroluminescent film 20 in such a way that the electroluminescent film 20 can be controlled “pixel by pixel” in order to display dynamic information.
  • the desired direction of emission of the electroluminescent film 20 is directed into the vehicle interior, while the emission via the outer pane 1 into the external environment is to be prevented.
  • the interior surface II of the outer pane 1 is provided with a band-stop filter, which in turn can be designed as a dielectric superlattice 40 or as a Fabry-Perot interferometer 50, as described in connection with FIG.
  • the band-stop filter 40, 50 could alternatively also be arranged on the outer surface I of the outer pane 1 or within the intermediate layer.
  • Figure 3 shows a further embodiment of a vehicle window according to the invention with an outer pane 1, an inner pane 2 and a thermoplastic intermediate layer 3, which is formed from a single PVB film with a thickness of 0.76 mm.
  • the vehicle window is provided as the roof window of a passenger car and is intended to provide a lighting function for the vehicle interior.
  • the vehicle window is equipped with a plurality of light-emitting diodes 30.
  • the surface II of the outer pane on the inside is provided with bores which form recesses for the light-emitting diodes 30.
  • the interior surface II is provided with an electrically conductive coating which functions as an electrode layer 31 for the light-emitting diodes 30.
  • the electrode layer 31 is structured by insulation lines in order to ensure the electrical leads to the individual light-emitting diodes 30.
  • the light-emitting diodes 30 are then inserted into the recesses of the surface II on the interior space and are electrically conductively connected to the electrode layer.
  • the desired direction of emission of the light-emitting diodes 30 is directed into the vehicle interior, while the emission via the outer pane 1 into the external environment is to be prevented.
  • the outside surface I of the outer pane 1 is provided with a band-stop filter, which in turn can be designed as a dielectric superlattice 40 or as a Fabry-Perot interferometer 50, as described in connection with FIG.
  • FIG. 4 shows a further embodiment of a vehicle window according to the invention with an outer window 1, an inner window 2 and a thermoplastic intermediate layer 3.
  • the vehicle window is an alternative embodiment of the roof window Illumination function from FIG. 3.
  • the light-emitting diodes 30 are inserted into recesses in the surface IV of the inner pane 2 on the inside.
  • the band-stop filter 40, 50 is arranged on the outside surface III of the inner pane 2.
  • the band-stop filter 40, 50 could equally well be applied to the interior surface II of the outer pane 1.
  • An arrangement of the band-stop filter 40, 50 on the outside surface I of the outer pane 1 or within the intermediate layer 3 is also possible, although less preferred.
  • FIG. 5 shows the schematic structure of a band-stop filter in the manner of a dielectric superlattice 40 on an inner pane 2.
  • the superlattice 40 is designed as in Tables 1 and 2.
  • FIG. 6 shows the schematic structure of a band-stop filter in the manner of a Fabry-Perot interferometer 50 on an inner pane 2.
  • the Fabry-Perot interferometer 50 is configured as in Table 3.
  • FIG. 7 shows schematically the transmission spectrum of a band-stop filter in the visible spectral range.
  • the band stop filter has a stop range with low transmission, while outside the stop range there is a high transmission.
  • the band stop filter can therefore block radiation that is in the stop range.
  • the spectral laser of the blocked region is characterized by the central wavelength lo (center point of the blocked region) and the half-width Dl (limited by the wavelengths at which 50% of the block depth DT) is reached. Since the band stop filter is based on interference effects, the transmission spectrum adjacent to the stop band is not ideally smooth, but rather has an oscillating shape.
  • the difference between the transmission value T max , which occurs at the local transmission maxima adjacent to the blocked area, and the smallest transmission value within the blocked area (minimum transmission T m in) is the block depth DT.
  • the minimum transmission T min is a measure of the quality of the band-stop filter - the lower the minimum transmission T min , the less radiation is allowed through by the band-stop filter.
  • the slope indicates the spectral range over which the transmission at the edges of the blocking range increases to the maximum transmission.
  • the properties of the band-stop filter can be adjusted through the design of the thin-film system.
  • the optical thickness of the individual layers have in particular influence on the central wavelength lo and the half-width Dl, while the block depth DT, the minimum transmission T min and the slope can be influenced in particular by the number of layers.
  • FIG. 8 shows the transmission spectrum (angle of incidence 0 °) of vehicle windows according to Examples 1-3 according to the invention, the layer structure of which is shown in Table 1.
  • a band-stop filter is formed by each superlattice 40, the band-stop filters differing in their spectral position.
  • the band-stop filter from example 1 is set to blue radiation around 450 nm, that from example 2 to green color around 550 nm and that from example 3 to red color around 560 nm.
  • FIG. 9 shows the transmission spectrum (angle of incidence 0 °) of vehicle windows according to Example 1 according to the invention and Examples 5 and 6 according to the invention, the layer structure of which is shown in Table 2.
  • a band-stop filter is formed through each superlattice 40, the central wavelength l ⁇ bG examples being identical. However, they differ significantly in their bandwidth Dl and their block depth DT.
  • FIG. 10 shows the transmission spectrum (angle of incidence 0 °) of the vehicle windows according to Example 6 according to the invention, the layer structure of which is shown in Table 3.
  • the Fabry-Perot interferometer 50 forms a band-stop filter with a blocking range in the blue spectral range around 400 nm.
  • An advantage of the Fabry-Perot interferometer 50 is that it can form further blocking ranges (or areas of reduced transmission), as in the present case seen in the red area around 700 nm.
  • the band-stop filter can, for example, be used as an IR protective coating at the same time.
  • thermoplastic connecting material (3a) first layer of thermoplastic connecting material (3b) second layer of thermoplastic connecting material
  • electroluminescent device electroluminescent film
  • electroluminescent device light-emitting diode
  • optically low-refraction layer of the Fabry-Perot interferometer 50 (53) electrically conductive layer of the Fabry-Perot interferometer 50 lo central wavelength of the band-stop filter Dl half-width of the band-stop filter DT block depth of the band-stop filter T min minimum transmission of the band-stop filter

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

La présente invention concerne une vitre de véhicule qui est composée d'une vitre extérieure (1) et d'une vitre intérieure (2) qui sont reliées l'une à l'autre par l'intermédiaire d'une couche intermédiaire thermoplastique (3), et est équipée d'un dispositif électroluminescent (20, 30) et d'un filtre d'élimination de bande optique (40, 50) ayant une plage d'élimination, - le filtre d'élimination de bande optique (40, 50) étant réalisé sous la forme d'un revêtement à couches minces composé de couches à indice de réfraction élevé ayant un indice de réfraction supérieur à 1,8, et de couches à faible réfraction optique ayant un indice de réfraction inférieur à 1,8, lesdites couches étant disposées en alternance, - la longueur d'onde moyenne du rayonnement émis par le dispositif électroluminescent (20, 30) se situant dans la plage d'élimination du filtre d'élimination de bande optique (40, 50), et - le filtre d'élimination de bande optique (40, 50) étant disposé de telle sorte que l'émission du dispositif électroluminescent (20, 30) au-delà de la vitre extérieure (1) ou au-delà de la vitre intérieure (2) est bloquée. La largeur totale à mi-hauteur (Δλ) de la plage d'élimination du filtre d'élimination de bande (40, 50) est de 10 nm à 50 nm.
PCT/EP2021/056292 2020-04-29 2021-03-12 Vitre de véhicule comprenant un dispositif électroluminescent et un filtre d'élimination de bande optique WO2021219285A1 (fr)

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WO2023247267A1 (fr) 2022-06-21 2023-12-28 Saint-Gobain Glass France Vitre composite dotée d'un élément hologramme

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DE102022003821A1 (de) 2022-10-17 2024-04-18 Mercedes-Benz Group AG Anordnung einer Beleuchtungseinrichtung an einer Verbundglasscheibe für ein Fahrzeug, Fahrzeug sowie Verbundglasscheibe für ein Fahrzeug

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WO2014029536A1 (fr) 2012-08-21 2014-02-27 Saint-Gobain Glass France Vitre feuilletée dotée de propriétés optiques commutables électriquement
US20150228696A1 (en) 2006-09-29 2015-08-13 Osram Opto Semiconductors Gmbh Organic Lighting Device and Lighting Equipment
WO2017103426A1 (fr) 2015-12-14 2017-06-22 Saint-Gobain Glass France Pare-brise feuilleté de véhicule avec signalétique lumineuse interne
WO2017203132A1 (fr) 2016-05-26 2017-11-30 Saint-Gobain Glass France Vitrage de signalisation lumineuse, vehicule l'incorporant et fabrication
DE102016209914A1 (de) 2016-06-06 2017-12-07 Bayerische Motoren Werke Aktiengesellschaft Scheibenvorrichtung für ein Kraftfahrzeug umfassend eine Fahrzeugscheibe und eine Anzeigeeinrichtung sowie Kraftfahrzeug
DE102017003621A1 (de) 2017-04-13 2018-10-18 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verbundglasscheibe mit intergrierter Anzeige

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Publication number Priority date Publication date Assignee Title
US20150228696A1 (en) 2006-09-29 2015-08-13 Osram Opto Semiconductors Gmbh Organic Lighting Device and Lighting Equipment
WO2014029536A1 (fr) 2012-08-21 2014-02-27 Saint-Gobain Glass France Vitre feuilletée dotée de propriétés optiques commutables électriquement
WO2017103426A1 (fr) 2015-12-14 2017-06-22 Saint-Gobain Glass France Pare-brise feuilleté de véhicule avec signalétique lumineuse interne
WO2017203132A1 (fr) 2016-05-26 2017-11-30 Saint-Gobain Glass France Vitrage de signalisation lumineuse, vehicule l'incorporant et fabrication
DE102016209914A1 (de) 2016-06-06 2017-12-07 Bayerische Motoren Werke Aktiengesellschaft Scheibenvorrichtung für ein Kraftfahrzeug umfassend eine Fahrzeugscheibe und eine Anzeigeeinrichtung sowie Kraftfahrzeug
DE102017003621A1 (de) 2017-04-13 2018-10-18 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verbundglasscheibe mit intergrierter Anzeige

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023247267A1 (fr) 2022-06-21 2023-12-28 Saint-Gobain Glass France Vitre composite dotée d'un élément hologramme

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