WO2023227733A1 - Fenêtre de véhicule avec agencement de cristaux liquides et couches d'électrode - Google Patents

Fenêtre de véhicule avec agencement de cristaux liquides et couches d'électrode Download PDF

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Publication number
WO2023227733A1
WO2023227733A1 PCT/EP2023/064094 EP2023064094W WO2023227733A1 WO 2023227733 A1 WO2023227733 A1 WO 2023227733A1 EP 2023064094 W EP2023064094 W EP 2023064094W WO 2023227733 A1 WO2023227733 A1 WO 2023227733A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
vehicle window
segments
conductor strip
conductor
Prior art date
Application number
PCT/EP2023/064094
Other languages
German (de)
English (en)
Inventor
Dominik Bauer
Original Assignee
Webasto SE
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 Webasto SE filed Critical Webasto SE
Publication of WO2023227733A1 publication Critical patent/WO2023227733A1/fr

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Classifications

    • 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
    • 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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals

Definitions

  • the invention relates to a vehicle window with the features of the preamble of patent claim 1.
  • Such a vehicle window is known from the document DE 10 2019 102 025 Al and represents a roof element that can be designed to be adjustable or fixed relative to a vehicle body.
  • the vehicle window is a composite component that has an outer window body and an inner window body, the outer window body forming an outer visible surface of the vehicle window and the inner window body forming an inner visible surface of the vehicle window.
  • a liquid crystal arrangement is arranged between the outer window body and the inner window body, which can be switched between a blocking state, in which the liquid crystal arrangement acts in the manner of a diffuser, and a transmission state, in which light can pass through the vehicle window essentially unscattered .
  • the liquid crystal arrangement comprises two films, between which a liquid crystal layer is arranged, which can be switched between the two states mentioned above by applying a corresponding electrical voltage.
  • both films comprise an electrode layer on the side facing the liquid crystal layer, which can be connected to a control device or a voltage source by appropriate electrical contacting.
  • the liquid crystal layer can in particular be designed as a so-called PDLC layer (polymer-dispersed liquid crystal layer).
  • PDLC layer polymer-dispersed liquid crystal layer.
  • the electrical contacting of the electrode layers takes place at the lateral edges of the liquid crystal arrangement, so that leaks can occur in this area. The leaks can lead to material diffusion between an adhesive that forms the composite structure holds together, and the liquid crystal layer, which can lead to so-called edge clearing, i.e.
  • each segment must be individually provided with an electrical contact on the lateral edge of the liquid crystal arrangement. Every single contact point has a leak problem.
  • only a strip of a certain width can be equipped with contacting conductors, since otherwise the viewing area provided by the vehicle window would be too severely restricted.
  • a sealing system must be provided to prevent diffusion.
  • the invention is based on the object of creating a vehicle window designed according to the type mentioned in the introduction, in which electrical contacting of several segments of a liquid crystal arrangement is possible with high tightness between the liquid crystal layer and other areas of the composite structure and with a small space requirement.
  • a vehicle window which comprises a composite structure which comprises an outer window body and a flat liquid crystal arrangement which is connected to the outer window body and which comprises a first film facing the window body, a second film facing away from the window outer body and a liquid crystal layer , which is arranged between the two films, the films each having an electrode layer on their side facing the liquid crystal layer. At least one of the electrode layers of the two films is divided into at least two segments that are electrically separated from one another.
  • a sealing conductor strip for electrical supply or connection of the segments is arranged on at least one edge of the liquid crystal arrangement, which surrounds this edge of the liquid crystal arrangement or connects to the films in such a way that the electrode layers are sealed against the environment, and at least two conductors arranged in parallel comprises, each of which is electrically connected to one of the segments of the electrode layer.
  • several segments of the liquid crystal arrangement are contacted by means of a single conductor strip, designed in the broadest sense in the manner of an adhesive tape, which is also designed as a sealing tape, which ensures critical material diffusion between the liquid crystal layer, which is arranged between the two electrode layers , and the surroundings of the liquid crystal device.
  • sealing and contacting can be achieved in one step using the sealing conductor tape.
  • Several conductor tracks are integrated into the conductor strip in the form of at least two conductors arranged in parallel. Furthermore, by integrating the two functions into the conductor strip, contacting can be achieved with a low overall height in the thickness direction of the vehicle window.
  • the sealing conductor tape can be provided as roll goods during the production of the vehicle window and, based on this, can be configured specifically for the specific application.
  • the conductors are electrically insulated in a flat strip-like sheath made of plastic of the conductor strip, the conductors each having a contact point at which the sheath has a recess so that the respective conductor over the contact point is electrically connected to the relevant segment of the electrode layer.
  • the recess is produced by locally removing or stripping the coating of the conductor tape.
  • the plastic of the casing is preferably temperature-resistant up to at least 125 °C.
  • the conductor tape as such or the sheathing of the conductor tape is preferably plasticizer-free and made from a material that is crosslinked under the influence of ultraviolet radiation or is also made from a two-component material.
  • the Vehicle window according to the invention in the area of the contact point an electrically conductive adhesive, a conductive paste or a solder is arranged in order to electrically connect the respective conductor and the relevant segment of the electrode layer to one another.
  • the electrically conductive adhesive, the conductive paste or the solder preferably fills the recess in the sheathing of the conductor tape.
  • the conductors of the conductor strip of the vehicle window according to the invention can each be formed from a metallic conductor or from a conductive plastic.
  • a metallized or conductively filled polymer can be used for the conductors. It is also conceivable to manufacture the ladder from a solid material or from a mesh material.
  • the conductor strip is therefore expediently arranged in such a way that a respective edge of the two electrode layers is covered by the conductor strip and thus sealed from the environment. This prevents penetration and/or diffusion of substances, in particular oxygen and plasticizers, which could damage the electrode layer and/or the liquid crystal layer.
  • the conductor strip extends at least over the exposed edges of the electrode layers and at least partially over the edges of the associated foils on which the electrode layers are arranged, that is to say also over the transition areas between the foils and the electrode layers.
  • the conductor tape is preferably sealingly connected to the two foils of the liquid crystal arrangement in such a way that a respective edge of the two foils on the side facing away from the liquid crystal layer is overlapped by the conductor tape or adjoins a relevant edge of the conductor tape.
  • the conductor strip preferably lies positively and cohesively on the two foils.
  • the cohesive connection can in particular be produced using a welding process.
  • the welding process may include an ultrasonic welding process and/or a high-frequency welding process.
  • the conductor tape can also be attached after a lamination process.
  • the conductor tape borders with an edge on an edge of one of the foils or with one edge on an edge of one foil and with a second edge on an edge of the other foil.
  • an adhesive in particular a liquid adhesive, can be introduced as an additional sealant, which fills any gap between the conductor tape and the relevant film or its electrode layer.
  • That of the two foils on which the electrode layer is segmented preferably has a lateral contact strip which protrudes from the other foil and on which the conductors of the conductor strip with the segments of the electrode layer are electrically connected.
  • the film with the segmented electrode layer therefore preferably has a greater width than the other film.
  • the barrier layer can be formed from a thin metal layer or from a diffusion-inhibiting polymer, taking into account that the diffusion is dependent on the path length
  • the liquid crystal arrangement is connected to the outer body of the window via an adhesive, with the conductor strip being completely absorbed by the adhesive.
  • the adhesive is in particular formed by a lamination layer, which is formed, for example, from polyvinyl butyral (PVB), an epoxy, a silicone, polyethylene or from another transparent plastic film, which in particular is polyethylene terephthalate (PET), polycarbonate (PC), thermoplastic polyurethane ( TPU), polymethyl methacrylate (PMMA) and/or cycloolefin copolymer (COC).
  • PVB polyvinyl butyral
  • PET polyethylene terephthalate
  • PC polycarbonate
  • TPU thermoplastic polyurethane
  • PMMA polymethyl methacrylate
  • COC cycloolefin copolymer
  • at least one hot melt adhesive film made of PVB can be used as an adhesive or purely hot melt made of PVB, EVA or TPU can be used as an adhesive.
  • the electrode layer is divided into at least four segments, of which two of the segments are electrically contacted via the conductor strip and its conductor, which is arranged on one edge of the liquid crystal arrangement, with a second edge of the liquid crystal arrangement second conductor band is arranged, which is designed corresponding to the first conductor band and which contains the other two segments of the electrode layer electrically contacted, so that they can also be connected to an electrical control or power source.
  • the segments are contacted alternately from both sides and are thus connected to a control device and to a voltage source via the two conductor strips.
  • An electrical contact between the conductors of the conductor strip and the electrode layer in question can be established using a soldering process, a welding process, in particular a high-frequency welding process or an ultrasonic welding process, or a mechanical connection process, such as a crimping process.
  • the segments of the electrode layer are strip-like and also parallel to one another.
  • the electrode layer comprises at least nine such strip-like segments, which run in the transverse direction of the roof when the vehicle window is formed, are arranged one behind the other and can be connected to the control device alternately from both sides via the conductor strips.
  • the electrode layers of both films are each divided into at least two segments.
  • the segments of the two electrode layers, which are electrically separated from one another by dividing lines, can be switched separately, so that the number of possible light patterns is increased.
  • a window inner body is also provided, which forms an inner visible surface of the vehicle window.
  • the liquid crystal layer of the liquid crystal arrangement is a PDLC layer (polymer-dispersed liquid crystal layer), which is characterized in that liquid crystals are incorporated in droplet form into a solid polymer or into a polymer matrix.
  • the liquid crystals can be aligned by applying an electrical voltage to the electrode layers formed on the two films in such a way that the transmission behavior of light through the vehicle window into the vehicle interior is controlled.
  • the voltage applied to the PDLC layer By changing the voltage applied to the PDLC layer, the light transmission or scattering behavior of this layer and thus the Scattering behavior of the entire vehicle window can be changed so that the PDLC arrangement represents a shading device.
  • the liquid crystals of the PDLC layer align in the same direction when an electrical voltage is applied, so that parts of the light pass through the vehicle window without being scattered and the transmission state of the PDLC arrangement is present. If there is no electrical voltage, the liquid crystals of the PDLC layer are randomly oriented, which leads to their clouding, so that the transparency of the vehicle window is low or non-existent.
  • This state represents the blocking state of the PDLC arrangement, in which the vehicle window acts like a lens due to the large diffuse scattered components of the light.
  • the PDLC arrangement is divided into several, in particular individually switchable, segments by segmenting the at least one electrode layer, so that they can be individually switched between the blocking state and the transmission state and different light patterns can be generated.
  • liquid crystal layer as a conventional liquid crystal cell, as a so-called PDLC one sided, as an SPD layer (Suspended Particles Device layer) or as an elink layer.
  • SPD layer Small Particles Device layer
  • a preferred embodiment of the vehicle window according to the invention is designed as a vehicle roof element.
  • the vehicle window can be an adjustable cover element of a roof opening system or a fixed roof element, which is, for example, part of a panoramic roof and can be arranged rigidly or immovably relative to the vehicle bodyshell.
  • Figure 1 is a schematic view of a roof area of a motor vehicle with a vehicle window according to the invention forming a fixed roof element;
  • Figure 2 is a top view of the fixed roof element
  • Figure 3 is an enlarged view of an area of the fixed roof element on the right in the direction of travel.
  • Figure 4 shows a section through the fixed roof element along line IV-IV in Figure 3.
  • a motor vehicle 10 which includes a vehicle roof, which is provided with a fixed roof element 12, which is rigidly, that is, immovably connected to a vehicle body.
  • the fixed roof element 12 forms a vehicle window which is equipped with a shading function, so that the incidence of light via the fixed roof element 12 into the vehicle interior of the motor vehicle 10 can be controlled.
  • the fixed roof element 12 has a composite structure, which can be seen in particular in FIG 12 forms.
  • a liquid crystal arrangement 18 is arranged between the outer pane body 14 and the inner pane body 16, which represents a shading system of the fixed roof element 12 and is formed from a PDLC arrangement (polymer-dispersed liquid crystal arrangement).
  • PDLC arrangement polymer-dispersed liquid crystal arrangement
  • LC arrangement conventional liquid crystal arrangement
  • the liquid crystal arrangement 18 is connected to the outer pane body 14 and the inner pane body 16 via an adhesive system 20, which is made of PCB (polyvinyl butyral).
  • the liquid crystal arrangement 18 comprises a first film 22 facing the outer pane body 14, which is formed from a material such as PET or the like, and a second film 24 facing the inner pane body 16, which is also made of a material such as PET or the like.
  • a so-called PDLC layer (polymer-dispersed liquid crystal layer) 26 is arranged, which forms the actual shading element and comprises a solid polymer matrix in which liquid crystals are integrated in droplet form are.
  • the foils 22 and 24 each carry, on the side facing the PDLC layer or liquid crystal layer 26, an electrode layer 28 or 30, which is formed from an ITO coating (indium tin oxide coating).
  • a voltage can be applied to the PDLC layer 26 using a control device, so that the transmission behavior of the PDLC layer 26 can be changed.
  • This makes it possible to adjust the PDLC layer 26 or the PDLC arrangement 18 between a blocking state in which the PDLC layer 26 strongly scatters light due to the non-directional liquid crystals, and a transmission state in which parts of the light are unscattered by the Can enter the vehicle interior through the vehicle window.
  • the second film 24 of the liquid crystal arrangement 18 located below has a greater width in the transverse direction of the fixed roof element 12 than the first film 22 located above, so that a contact strip 32A or 32B of the film 24 is formed in the lateral edge regions, over which the electrode layer 30 can be contacted or connected to the control device.
  • the electrode layer 28 of the first film 22 is connected to the control device at another suitable location.
  • the electrode layer 30 of the lower film 24 is divided into nine segments 1 to 9, which are formed from transverse strips arranged in parallel and lying one behind the other in the longitudinal direction of the fixed roof element 12. Segments 1 to 9 are separated from each other by dividing lines and have no electrical connection to one another.
  • the individual segments 1 to 9 In order to be able to connect or contact the individual segments 1 to 9 with the control device, not shown, they extend in the transverse direction of the roof into at least one of the two lateral contact strips 32A and 32B of the lower film 24.
  • the lateral edges of the liquid crystal arrangement 18 are each surrounded by a sealing conductor strip 34, which extends in the longitudinal direction of the fixed roof element 12 and can be connected in a manner not shown to a control line of the control device of the liquid crystal arrangement 18.
  • the conductor strip 34 has a flat strip-like casing 36 made of an electrically insulating, plasticizer-free, temperature-stable plastic material, in which several conductors 38-1, 38-3, 38-5, 38-7 and 38-9 aligned parallel to one another are embedded, the conductor 38-1 for the electrical connection of segment 1, the conductor 38-3 for the electrical connection of segment 3, the conductor 38-5 for the electrical connection of segment 5, the conductor 38-7 for the electrical connection of segment 7 and the conductor 38- 9 is used to electrically connect the segment 9 of the electrode layer 30 of the lower film 24 to the control device.
  • a conductor strip 34 of this type is also arranged, this conductor strip having four parallel conductors which are used to electrically connect the segments 2, 4, 6 and 8 of the electrode layer 30 of the film 24 serve.
  • the segments 1 to 3 can be individually electrically connected to the control device via the conductors of the two conductor strips 34.
  • the casing 36 of the conductor strip 34 has a recess 40 for electrical contacting of the segments 1, 3, 5, 7 and 9 or the segments 2, 4, 6 and 8, which is filled by an electrically conductive adhesive 42 electrical connection between the relevant conductor of the conductor strip 34 and the associated segment of the electrode layer 30 of the film 24. This is shown in Figure 4 for segment 1 and is also implemented in the relevant areas of the casing 36 for segments 3, 5, 7 and 9.
  • the conductor strip 34 also has a barrier layer 44 formed from a metal strip, which follows the course of the conductor strip 34 from the top of the upper film 22 to the underside of the film 24. As can be seen from Figure 4, the conductor strip 34 lies sealingly on an edge region of the upper film 22 from above and on an edge region of the lower film 24 from below. A cohesive connection between the conductor strip 34 and the foils 22 and 24 can be realized using a welding process. In addition, the conductor tape 34 is completely absorbed by the adhesive of the adhesive system 20.
  • the conductor strip 34 on the contact strips 32B is designed in a corresponding manner for the segments 2, 4, 6 and 8.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne une fenêtre de véhicule comprenant une structure composite qui comprend un corps externe de fenêtre (14) et un agencement de cristaux liquides plat (18), lequel agencement de cristaux liquides est fixé au corps externe de fenêtre (14) et comprend une première feuille (22) faisant face au corps externe de fenêtre (14), une seconde feuille (24) opposée au corps externe de fenêtre (14) et une couche de cristaux liquides (26) disposée entre les deux feuilles (22, 24), les feuilles (22, 24) ayant chacune une couche d'électrode (28, 30) sur leur côté faisant face à la couche de cristaux liquides (26). Au moins une des couches d'électrode (28, 30) des deux feuilles (22, 24) est subdivisée en au moins deux segments (1, 2, 3, 4, 5, 6, 7, 8, 9) et une bande conductrice d'étanchéité (34) est disposée au niveau d'au moins un bord de l'agencement de cristaux liquides (18) pour connecter électriquement les segments (1, 2, 3, 4, 5, 6, 7, 8, 9), ladite bande conductrice venant en prise autour de ce bord de l'agencement de cristaux liquides (18) et/ou au moins un bord de ladite bande conductrice bordant au moins l'une des feuilles (22, 24) de telle sorte que les couches d'électrode (28, 30) sont étanchéifiées, ladite bande conductrice comprenant au moins deux conducteurs (38) agencés en parallèle, qui sont chacun connectés électriquement à l'un des segments (1, 2, 3, 4, 5, 6, 7, 8, 9) de la couche d'électrode (30).
PCT/EP2023/064094 2022-05-27 2023-05-25 Fenêtre de véhicule avec agencement de cristaux liquides et couches d'électrode WO2023227733A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022113404.0A DE102022113404A1 (de) 2022-05-27 2022-05-27 Fahrzeugscheibe mit Flüssigkristallanordnung und Elektrodenschichten
DE102022113404.0 2022-05-27

Publications (1)

Publication Number Publication Date
WO2023227733A1 true WO2023227733A1 (fr) 2023-11-30

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PCT/EP2023/064094 WO2023227733A1 (fr) 2022-05-27 2023-05-25 Fenêtre de véhicule avec agencement de cristaux liquides et couches d'électrode

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DE (1) DE102022113404A1 (fr)
WO (1) WO2023227733A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016216930A1 (de) * 2016-09-07 2018-03-08 Bayerische Motoren Werke Aktiengesellschaft Folie und Vorrichtung zur segmentweisen Abdunkelung einer Fahrzeugscheibe
DE102019102025A1 (de) 2019-01-28 2020-07-30 Webasto SE Fahrzeugscheibe mit Lichtstreuschicht
WO2021165093A1 (fr) * 2020-02-19 2021-08-26 Saint-Gobain Glass France Vitre en verre feuilleté comprenant de multiples éléments fonctionnels et une barre-bus sur un film barrière

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112020023455A2 (pt) 2018-06-11 2021-02-23 Saint-Gobain Glass France elemento funcional com propriedades óticas eletricamente controláveis

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016216930A1 (de) * 2016-09-07 2018-03-08 Bayerische Motoren Werke Aktiengesellschaft Folie und Vorrichtung zur segmentweisen Abdunkelung einer Fahrzeugscheibe
DE102019102025A1 (de) 2019-01-28 2020-07-30 Webasto SE Fahrzeugscheibe mit Lichtstreuschicht
WO2021165093A1 (fr) * 2020-02-19 2021-08-26 Saint-Gobain Glass France Vitre en verre feuilleté comprenant de multiples éléments fonctionnels et une barre-bus sur un film barrière

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Publication number Publication date
DE102022113404A1 (de) 2023-11-30

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