WO2018233989A1 - Vehicle window having a liquid crystal arrangement - Google Patents

Vehicle window having a liquid crystal arrangement Download PDF

Info

Publication number
WO2018233989A1
WO2018233989A1 PCT/EP2018/064086 EP2018064086W WO2018233989A1 WO 2018233989 A1 WO2018233989 A1 WO 2018233989A1 EP 2018064086 W EP2018064086 W EP 2018064086W WO 2018233989 A1 WO2018233989 A1 WO 2018233989A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
layer
vehicle window
vehicle
window according
Prior art date
Application number
PCT/EP2018/064086
Other languages
German (de)
French (fr)
Inventor
Daniela BAIERL
Steffen Lorenz
Jonas DIETRICH
Max BUCHMANN
Jan Grothe
Oliver HEISEL
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 WO2018233989A1 publication Critical patent/WO2018233989A1/en

Links

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
    • 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
    • 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
    • B32B17/10018—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 only one glass sheet
    • 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
    • B32B17/10082—Properties of the bulk of a glass sheet
    • B32B17/10119—Properties of the bulk of a glass sheet having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate
    • 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
    • B32B17/10128—Treatment of at least one glass sheet
    • B32B17/10137—Chemical strengthening
    • 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
    • B32B17/10467—Variable transmission
    • B32B17/10495—Variable transmission optoelectronic, i.e. optical valve
    • B32B17/10504—Liquid crystal layer
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/10733—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 resin layer, i.e. interlayer containing epoxy
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/10743—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 resin layer, i.e. interlayer containing acrylate (co)polymers or salts thereof
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/10761—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 resin layer, i.e. interlayer containing vinyl acetal
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/1077—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 resin layer, i.e. interlayer containing polyurethane
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/10788—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 resin layer, i.e. interlayer containing ethylene vinylacetate
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/10798—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 resin layer, i.e. interlayer containing silicone
    • 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
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/10816—Making laminated safety glass or glazing; Apparatus therefor by pressing
    • B32B17/10825—Isostatic pressing, i.e. using non rigid pressure-exerting members against rigid parts
    • B32B17/10834—Isostatic pressing, i.e. using non rigid pressure-exerting members against rigid parts using a fluid
    • B32B17/10844—Isostatic pressing, i.e. using non rigid pressure-exerting members against rigid parts using a fluid using a membrane between the layered product and the fluid
    • B32B17/10853—Isostatic pressing, i.e. using non rigid pressure-exerting members against rigid parts using a fluid using a membrane between the layered product and the fluid the membrane being bag-shaped
    • 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
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/10816—Making laminated safety glass or glazing; Apparatus therefor by pressing
    • B32B17/10871—Making laminated safety glass or glazing; Apparatus therefor by pressing in combination with particular heat treatment
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • 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
    • 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
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • 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
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • 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
    • G02F1/133302—Rigid substrates, e.g. inorganic substrates
    • 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
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/54—Arrangements for reducing warping-twist
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the invention relates to a vehicle window having the features of the preamble of patent claim 1.
  • Such a vehicle window is known from practice and may be an adjustable or fixed roof element of a motor vehicle.
  • the vehicle window comprises a plate-like disk body, which as a rule consists of glass and forms the outer skin of the roof element.
  • the disk body On its inside, the disk body is provided with a liquid crystal arrangement which is electrically switchable and thus defines the transparency of the vehicle window.
  • the vehicle window is either largely translucent or substantially opaque, so that it forms a shading arrangement.
  • liquid crystals in droplet form in a polymer.
  • the liquid crystals are disordered, which is why essentially no light transmission is possible. There is a milky appearance.
  • the liquid crystals align, whereby light can be transmitted.
  • SPD Small Particle Device
  • An SPD film comprises small, rod-shaped particles in a corresponding cell, which are embedded in a thin plastic film and initially aligned arbitrarily. Under an electric field, these particles align so that light can be transmitted.
  • the problem is that such SPD films only in blue and not can be produced in a neutral color, which can be readily used in a motor vehicle.
  • the invention has for its object to provide a vehicle window according to the initially mentioned type formed vehicle window, which has a liquid crystal arrangement with uniform shading behavior even with a three-dimensionally curved disk body.
  • a vehicle window which comprises a plate-like, planar or curved window body which has an outer side facing away from the vehicle surroundings and an inner side facing away from the outer side and on the inner side of which a shading arrangement is formed, which is formed from a liquid crystal arrangement comprising a liquid crystal cell ,
  • the liquid crystal device comprises two layers of flexible thin glass, between which the liquid crystal cell is arranged and between which spacers are arranged, so that the liquid crystal cell has an at least substantially constant thickness over its extent.
  • the liquid crystal device By arranging the liquid crystal cell between two flexible thin glass layers, the liquid crystal device can follow the particular curved shape of the plate-like disk body, which can be made of glass or a plastic such as a polycarbonate or PMMA.
  • the plate-like disk body which can be made of glass or a plastic such as a polycarbonate or PMMA.
  • a good deformability of the liquid crystal arrangement is ensured.
  • a homogeneous thickness of the liquid crystal cell can be achieved over its extent despite deformation of the two thin glass layers.
  • the thin glass used for the liquid crystal arrangement of the vehicle windshield according to the invention is, in particular, a chemically tempered glass, which may be assigned to the group of aluminosilicate glasses and is designed to be flexible. Such a glass is characterized by a high resistance to breakage and scratching.
  • the layers of flexible thin glass each have a thickness of 0.1 mm to 1.5 mm. Due to the low layer thicknesses, the total weight of the vehicle window can be kept low according to the invention.
  • the use of the thin glass layers for the liquid crystal device prevents moisture diffusion through the substrates of the liquid crystal device formed by the thin glass layers.
  • the thin glass has a high thermal and mechanical stability. This can be counteracted bulges and ripples, which could lead to liquid accumulation and / or defects in the liquid crystal cell.
  • the liquid crystal device can directly form the inner visible surface of the vehicle window according to the invention, since the thin glass itself can already have a high visual appearance.
  • the pane body has a curvature along a longitudinal direction of the pane and along a transverse direction of the pane. This results in a three-dimensional curvature of the disk body.
  • the curvature can each have a radius of curvature between 1,000 mm and 10,000 mm, preferably between 2,000 mm and 5,000 mm.
  • the radius of curvature can vary, that is, it must not be constant in the respective direction.
  • a conductive layer for the electrical connection of the liquid-crystal cell is arranged on the vehicle electrical system of the vehicle in question.
  • an alignment layer on the two thin glass layers on the inside or on the conductive layers in each case an alignment layer can be arranged, the for example, may be formed from a UV-curing acrylate or a polyimide. These serve to advance the liquid crystals of the liquid crystal cell in the non-switched state.
  • the liquid crystal device of the vehicle window according to the invention can be operated over a wide temperature range with short switching times of about one second.
  • a low voltage for actuating the liquid crystal device that is, for switching between a blocking position and a passage position, sufficient.
  • the voltage which is in particular designed as an alternating voltage, may be less than 30 V.
  • the frequency of the AC voltage is for example 60 Hz, but may also be higher depending on the desired speed of the alignment of the liquid crystals and be up to 100 to 120 Hz or lower.
  • the liquid crystal arrangement of the vehicle window according to the invention in the unswitched state provides a very low transmission, which is less than 1% for visible light.
  • the color of the liquid crystal array is gray, but can be customized by incorporation of dyes.
  • the vehicle window according to the invention is in particular a roof element of the relevant vehicle.
  • This roof element may be formed as a fixed roof element, which is rigidly connected to the vehicle body, or as a movable roof element, which constitutes a cover element of a sliding roof arrangement.
  • a polarizer layer is provided in a preferred embodiment of the vehicle window.
  • the polarizer layer is preferably arranged between the disk body and the liquid-crystal arrangement, but may also be arranged on the side of the liquid-crystal arrangement facing away from the disk body.
  • the polarizer layer preferably has, independently of the arrangement, a polarization direction which may be oriented at right angles to a polarization direction of the liquid crystal cell in its unswitched state. The switched state is then assigned to the transmission state. But it is also conceivable that in the unswitched state of the liquid crystal cell, the polarization direction of the polarizer layer is parallel to the polarization direction of the liquid crystal cell, so that then the transmission state of the arrangement is present.
  • the polarizer layer is preferably connected to this functional layer via a length expansion compensation layer.
  • the length expansion compensation layer which is preferably optically isotropic, may be an acrylate layer, a thermoplastic polyurethane layer, an epoxy layer, a silicone layer or else a layer of a crosslinking material, such as ethylene vinyl acetate (EVA) or polyvinyl butane (PVB).
  • EVA ethylene vinyl acetate
  • PVB polyvinyl butane
  • the length expansion compensation layer preferably has a thickness of at least 0.2 mm, preferably of at least 0.4 mm.
  • the vehicle window according to the invention expediently has a peripheral RandumFumung.
  • the vehicle window according to the invention may have a splinter protection film which is arranged on the side of the vehicle window facing away from the window body.
  • the splinter protection film In order to ensure the retention function of the preferably scratch-resistant and / or tear-resistant splinter protection film, it is preferably at least partially overlapped by the circumferential edge foam or foamed into it.
  • the shatter-proofing film can be glued in a central region of the pane. In an edge region, the splinter protection film can have perforations for the passage of the edge foam.
  • the splinter protection film is formed, for example, from a polysiloxane-coated ethylene terephthalate film (PET film).
  • the splinter protection film can be bonded to the liquid crystal arrangement or to the polarizer layer via an adhesive film which consists of a polyvinyl butyral film (PVB film) or a transparent polyurethane film.
  • PVB film polyvinyl butyral film
  • transparent polyurethane film a polyurethane film
  • a disk inner body may be arranged on the inside of the vehicle window, which is formed from glass, in particular a thin glass, or from a plastic, in particular from polycarbonate.
  • plastic as a disk body and / or as a disk inner body is simplified by the fact that thin glass layers are used as a substrate for the liquid crystal array, each forming a perfect barrier layer.
  • the inherently insufficient barrier properties of the respective plastic can thus be at least partially neglected.
  • a special embodiment of the vehicle window according to the invention comprises a light guide layer, which can be connected via its edge to a light source or is connected via its edge to a light source.
  • the light guide layer which can be integrated in a single-stage process during the manufacture of the vehicle window together with the liquid crystal arrangement and the possible further layers, can be an illumination system for the interior of the vehicle in question.
  • the light guide layer is part of a so-called ambient light illumination of the vehicle in question.
  • the functionality of the switchable liquid crystal arrangement and the functionality of a planar illumination, in particular an ambient light illumination are combined with one another.
  • the optical fiber layer and the remplissigkristallan- order are separately and independently controllable, d. H. switchable so that the liquid crystal device assumes its transmission state or its blocking state and the optical fiber layer is lit or not illuminated.
  • the process parameters When connecting the individual layers of the vehicle window, the process parameters must be matched to the liquid crystal arrangement and the light guide layer, that both the adhesion of the two layers and the function of both layers is ensured.
  • the light guide layer is arranged on the side facing away from the vehicle surroundings of the liquid crystal arrangement. This means that the light guide layer is independent of
  • the light guide layer can form an inner visible surface of the vehicle window.
  • the light guide layer may be made of any suitable materials.
  • the optical waveguide layer may comprise a planar glass body, which offers the advantage that it may be possible to dispense with further protective layers on the inner side of the vehicle window.
  • the light guide layer may comprise a plastic film and / or a plastic plate. This is particularly advantageous if the vehicle window should be designed weight-optimized.
  • the optical waveguide layer In order to be able to give the optical waveguide layer specific desired luminous properties, it preferably contains scattering centers, which in particular can be formed by nanoparticles. The scattering centers are distributed in particular homogeneously in the light guide layer.
  • the optical waveguide layer has a printing which, for example, specifies a luminous pattern and can also serve as a reflection layer. It is also conceivable that the liquid crystal arrangement has a reflection layer.
  • the optical waveguide layer may further comprise a scratch-resistant coating.
  • the production of the vehicle window according to the invention can take place in different ways.
  • the individual layers of the vehicle window are connected after a vacuum lamination or autoclave process, whereby the composite of the individual layers is exposed to specific pressures and temperatures.
  • adhesive plastic films can be used asChinanausdehnungskompensations füren that undergo thermoplastic or crosslinking properties in a heating compound with the other layers, that is with the disk body, the liquid crystal array, the polarizer layer and / or the disc inner body.
  • Vakuumlamination takes place a one-sided heating of the composite by a hot plate, wherein a pressurization takes place via a pressure difference in a chamber which is divided into two by a membrane.
  • the laminate When manufactured in an autoclave chamber, the laminate is heated on all sides by means of circulating air. Air pressures up to about 15 bar can be set.
  • the manufacture of the vehicle window according to the invention can take place by a so-called optical bonding method, in which optically highly transparent and non-yellowing adhesives are used as length expansion compensation layers.
  • silicones can be used which have a high temperature stability and could later be removed without destruction.
  • polyurethanes, acrylates or epoxides could be used.
  • the invention also relates to a method for producing a vehicle window, comprising the following steps:
  • Creating a structure of a plurality of layers in a stacked form in a frame comprising a disk body, a liquid crystal device comprising a liquid crystal cell and two layers of flexible thin glass, between which the liquid crystal cell is disposed, and a Gaznausdehnungskompensati- ons harsh between the liquid crystal array and the disk body comprises, wherein at least the liquid crystal array and the length expansion compensating layer are arranged in a frame defining their relative position;
  • the structure arranged in the vacuum bag is heated while being subjected to the pressure.
  • the temperatures at which the structure is heated for example, between 50 ° C and 150 ° C.
  • the pressure exerted on the vacuum bag is preferably in a range between 1 bar and 20 bar, in particular between 1 bar and 12 bar. This process can be carried out in an autoclave chamber.
  • a pressure plate To stabilize the structure in the frame, it can be covered with a pressure plate.
  • the pressure plate provides an auxiliary structure which ensures that the individual layers of the structure maintain their shape during the joining process.
  • the structure may according to the vehicle window according to the invention comprise a polarizer layer and / or a light guide layer.
  • a switchable shading device in the form of the liquid crystal arrangement and a surface illumination system in the form of the light guide layer can be integrated into the vehicle window.
  • Figure 1 is a plan view of a vehicle roof with a vehicle window according to the invention
  • Figure 2 shows a section through the vehicle window, the layer structure
  • FIG. 3 shows a section through a second embodiment of a vehicle window according to the invention
  • Figure 4 is a section through a third embodiment of a vehicle window according to the invention.
  • Figure 5 is a section through a fourth embodiment of a vehicle window according to the invention.
  • Figure 6 is a section through a fifth embodiment of a vehicle window according to the invention.
  • Figure 7 is a section through a sixth embodiment of a vehicle window according to the invention.
  • FIG. 9 shows a section through a seventh embodiment of a vehicle window according to the invention.
  • FIGS. 10a to e show the manufacture of the vehicle window according to FIG. 9.
  • FIG. 1 shows a vehicle roof 10 of a motor vehicle, which is not shown in detail.
  • the vehicle roof 10 is a panoramic roof, which is provided with an adjustable cover element 12 of a sunroof and a fixed roof element 14 which is rigidly connected to the structure of the motor vehicle.
  • the lid member 12 and the fixed compartment member 14 are each formed as a glass element and thus as a vehicle window.
  • the cover element 12 and the fixed roof element 14 each have the same layer structure, which is provided with a shading arrangement and which is illustrated with reference to FIG.
  • Each formed as a vehicle window roof panels 12 and 14 each form a disc assembly, which is a disc body 16 which is formed of a along a disc longitudinal direction and along a disc transverse direction in each case curved glass plate and the outer skin of the respective vehicle window.
  • a polarizer layer 20 which comprises a linear polarizer, is connected via a length expansion compensation layer 18 with adhesive properties.
  • the length-expansion compensating layer 18 may be formed of thermoplastic polyurethane, polyvinyl butyral, ethylene-vinyl acetate copolymer or the like.
  • the polarizer layer 20 is in turn applied to a liquid crystal array 22, which forms a flat shading arrangement of the vehicle window.
  • the liquid crystal assembly 22 is further provided with a splinter protection film 24.
  • the anti-shatter film 24 consists of a polysiloxane-coated polyethylene terephthalate film.
  • the polarizer layer 20 has a polarization direction which is oriented at right angles to the polarization direction of the liquid crystal cell 32 in its blocking position.
  • the vehicle windows forming the cover element 12 and the fixed roof element 14 have in each case an encircling edge foam 26, which engages over the splinter protection film 24 on the inside of the respective vehicle window and which is formed from a polyurethane foam.
  • the liquid crystal array 22 comprises two thin glass layers 28 and 30 having a thickness of about 0.5 mm.
  • the respective thin glass is a chemically toughened glass and flexible.
  • a single liquid crystal cell 32 is arranged.
  • a conductive layer for electrical connection of the liquid crystal cell to an electrical system of the vehicle is arranged in each case.
  • a respective alignment layer is expediently arranged on the conductive layers.
  • the alignment layers which may be formed of a polyimide or a UV-curing acrylate, respectively limit the liquid crystal cell 32 and serve for Pre-alignment of the liquid crystals in the liquid crystal cell in the non-switched state.
  • the two alignment layers are separated from one another by spacers 33, not shown in more detail, so that the thickness of the liquid crystal cell 32 in which the liquid crystals are arranged is at least substantially constant over the extent of the liquid crystal arrangement.
  • FIG. 3 shows an alternative embodiment of a vehicle window 40 which differs from the vehicle window illustrated in FIG.
  • polarizer layer 20 which is laminated directly onto the inside of the pane body 16 forming the outer skin.
  • the polarizer layer 20 is bent over a length expansion compensation layer 18 formed of an acrylate layer, a thermoplastic polyurethane layer, an epoxy layer, a silicone layer, or a layer of a crosslinking material such as ethylene vinyl acetate (EVA) or polyvinyl butyral (PVB) Liquid crystal device 22 which corresponds to the liquid crystal device shown in Figure 1.
  • EVA ethylene vinyl acetate
  • PVB polyvinyl butyral
  • the vehicle window 40 according to FIG. 3 also has a peripheral edge foam 26 made from a polyurethane foam. Between the thin glass layers 28 and 30 spacers 33 are arranged. It is also conceivable for the polarization layer 18 to be connected both to the disk body 16 and to the liquid crystal arrangement 22 via a length expansion compensation layer of the type described above.
  • FIG. 4 shows a further embodiment of a vehicle window 50, which likewise largely corresponds to the vehicle window according to FIG. 2, but differs therefrom in that a liquid crystal arrangement 22, which likewise has two layers 28 and 30 of bent thin glass, corresponding to the embodiment of FIG which bound a liquid crystal cell 32 is connected via a length expansion compensation layer 18 directly to a disk body 16 forming the outer skin.
  • a polarizer layer 20 is laminated onto the liquid crystal device 22, to which in turn a splinter protection film 24 is laminated.
  • the splinter protection film 24 is overlapped according to the embodiments described above at their edges by a circumferential polyurethane edge foam of the vehicle pulley 50.
  • FIG. 5 shows a further embodiment of a vehicle window 60 according to the invention.
  • the vehicle window 60 differs from the vehicle window according to FIG. 2 in that it has no anti-shatter protection film on the inside. Rather, a further layer 64 of bent thin glass is on another length expansion compensation layer 62 with adhesive properties on the
  • Liquid crystal assembly 22 laminated. This thin glass forms the inner visible surface of the vehicle window 60.
  • FIG. 6 shows a further embodiment of a vehicle window 70 according to the invention.
  • the vehicle window 70 differs from the vehicle window according to FIG. 5 in that it comprises a window body 16 'made of a plastic material, such as a polycarbonate. In addition, it also has on the inside, instead of a glass layer, a layer 64 'of a plastic material, such as polycarbonate.
  • the vehicle window 70 corresponds to the vehicle window according to FIG. 5.
  • FIG. 7 shows an alternative vehicle window 100 for use with a cover element or a fixed roof element of the type shown in FIG.
  • the vehicle window pane 100 forming a pane arrangement has a pane body 16, which may have a three-dimensional curvature and to which a liquid crystal arrangement 22 is attached on the inside via a length expansion compensation layer 18, which has adhesive properties.
  • the liquid crystal device 22 comprises two thin glass layers 28 and 30 between which a single liquid crystal cell 32 and spacers 33 are interposed.
  • conductive layers 28 and 30 are arranged on the insides of the foils and can be connected to the vehicle electrical system of the vehicle in question via a corresponding contact-connection, not shown in more detail.
  • the liquid crystal cell 32 can be switched between a transmission state and a blocking state.
  • An optical waveguide layer 80 which is formed from a thin plastic plate made of PMMA (polymethyl methacrylate) or the like, in which nanoparticles are embedded to produce scattering centers, is in turn connected to the liquid crystal arrangement 22 via a further length expansion compensation layer 102.
  • the light guide layer 80 On the inside, ie the side facing the vehicle interior, the light guide layer 80 is also provided with a scratch-resistant coating (hard coat) 82.
  • the light guide layer 80 is connected via its peripheral edge with a light source 81, so that in a corresponding switching state of the light source, light can be coupled into the light guide layer 80 and thus can be used as lighting for the relevant vehicle interior.
  • the length-expansion compensating layers 18 and 102 are formed corresponding to the length-expansion compensating layers of the embodiment of FIG.
  • a polarizer layer 20 is additionally arranged between the liquid crystal arrangement 22 and the light guide layer 80.
  • the polarizer layer 20 is laminated on the liquid crystal device 20 and can Alternatively, between the liquid crystal array 22 and the disk body 16 may be arranged.
  • the light guide layer 80, the liquid crystal array 22 with the polarizer layer 20, and the length expansion compensating layers 18 and 102 are provided (FIG. 8 a) and then stacked in a frame 84 and placed on the disk body 16.
  • the frame 84 is made of PTFE.
  • a pressure plate 86 is placed on the above-arranged light guide layer 80, which is provided with the scratch-resistant coating 82, so that an intimate connection between the individual placed on the disk body 16 layers ( Figure 8b).
  • the frame, together with the layer structure comprising the disk body 16, the length expansion compensation layers 18 and 102, the liquid crystal array 22, the polarizer layer 20, the light guide layer 80 and the pressure plate 46 is placed in a vacuum bag 98 (FIG. 8c).
  • FIG. 9 shows a further alternative embodiment of a pane arrangement 1 10 for use in a cover element or a fixed roof element of the type shown in FIG.
  • the disk assembly 110 also comprises a disk body 16, which may also have a three-dimensional curvature and to the inside via a Trustnausdehnungskom- compensation layer 18, which has adhesive properties, a liquid crystal array 22 is connected, which is formed according to the embodiment of Figure 7. Again, the liquid crystal array 22 is provided on its side facing away from the disk body 16 with a polarization layer 20. Via a further length expansion compensation layer 102, a light conductor layer 80 ', which can be regarded as a disk inner body and consists of a clear glass panel, is connected to the liquid crystal arrangement 22 with the polarizer layer 20. The light guide layer 80 'forms the inner visible surface of the disc assembly 1 10.
  • the light guide layer 80' On the side facing away from its inner visible surface, the light guide layer 80' is provided with a printing pattern 1 12, which supports the effect of the light guide layer 80 'as an ambient light illumination device. At its peripheral edge, the light guide layer 80 'is connected in the installed position with at least one light source 81, by means of the light in the light guide layer 80' can be coupled.
  • two functionalities are integrated, namely on the one hand a shading functionality in the form of the switchable liquid crystal array 22 together with the polarizer layer 20 and on the other hand, a lighting functionality in the form of the light guide layer 80 ', which is connected to the switchable light source 81 and is connectable. Again, both functions are independently controllable.
  • the production of the disk arrangement 1 10 forming a lamination structure shown in FIG. 9 takes place substantially analogously to the production of the disk arrangement according to FIG. 7, which is illustrated with reference to FIG. 8 and is illustrated with reference to FIG.
  • the length expansion compensation layer 18, the liquid crystal array 22 with the polarization layer 20, the longitudinal expansion compensation layer 102 and the precut light guide layer 80 'formed from a glass panel (FIG. 10a).
  • These layers which are intended to form a layer structure with the disk body 16 in the arranged form, are then arranged in a frame 84 on the disk body 16 in a stacked form.
  • the frame 84 holds the relative position of the individual layers of the layer structure (FIG. 10b).
  • the disk body 16 is inserted into a vacuum bag together with the frame 84 which receives said layers ( Figure 10c), which is then vented and subjected to an elevated pressure and temperature.
  • the optical waveguide layer 80 ', the liquid crystal array 22 with the polarizer layer 20 and the disk body 16 are arranged together in one process step (FIG. 10d).
  • the finished product that is, the disc assembly 1 10 can be removed from the vacuum bag 98 and after release from the frame 84 further processed or provided for use in a sliding roof cover element, a fixed roof element or the like ( Figure 10e).

Abstract

The invention relates to a vehicle window, comprising a plate-like window body (16) which has an outer side facing a vehicle environment and an inner side facing away from the outer side, and wherein a shading arrangement is arranged on the inside thereof, which is formed by a liquid crystal arrangement (22) that has a liquid crystal cell (32). The liquid crystal arrangement (22) comprises two layers (28, 30) of flexible thin glass, between which the liquid crystal cell (32) is arranged, wherein spacers are disposed between the two layers (28, 30) of thin glass so that the liquid crystal cell (32) has an at least largely constant thickness over its extension.

Description

FAHRZEUGSCHEIBE MIT FLÜSSIGKRISTALLANORDNUNG  VEHICLE WASH WITH LIQUID CRYSTAL ASSEMBLY
Die Erfindung betrifft eine Fahrzeugscheibe mit den Merkmalen des Oberbegriffs des Patentanspruchs 1. The invention relates to a vehicle window having the features of the preamble of patent claim 1.
Eine derartige Fahrzeugscheibe ist aus der Praxis bekannt und kann ein verstellbares oder festes Dachelement eines Kraftfahrzeuges sein. Die Fahrzeugscheibe umfasst einen plattenartigen Scheibenkörper, der in der Regel aus Glas besteht und die Außenhaut des Dachelementes bildet. An seiner Innenseite ist der Scheibenkörper mit einer Flüssigkristallanordnung versehen, die elektrisch schaltbar ist und so die Lichtdurchlässigkeit der Fahrzeugscheibe vorgibt. In Abhängigkeit vom Schaltzustand der Flüssigkristallanordnung ist die Fahrzeugscheibe entweder weitgehend lichtdurchlässig oder weitgehend lichtundurchlässig, so dass sie eine Beschattungsanordnung bildet. Such a vehicle window is known from practice and may be an adjustable or fixed roof element of a motor vehicle. The vehicle window comprises a plate-like disk body, which as a rule consists of glass and forms the outer skin of the roof element. On its inside, the disk body is provided with a liquid crystal arrangement which is electrically switchable and thus defines the transparency of the vehicle window. Depending on the switching state of the liquid crystal device, the vehicle window is either largely translucent or substantially opaque, so that it forms a shading arrangement.
Des Weiteren ist es bekannt, Flüssigkristalle in Tröpfchenform in ein Polymer einzubinden. Im Grundzustand sind die Flüssigkristalle ungeordnet, weswegen im Wesentlichen keine Lichttransmission möglich ist. Es liegt ein milchiges Erscheinungsbild vor. Wenn hingegen an die entsprechende Flüssigkristallzellen Spannung angelegt wird, richten sich die Flüssigkristalle aus, wodurch Licht transmittiert werden kann. Furthermore, it is known to incorporate liquid crystals in droplet form in a polymer. In the ground state, the liquid crystals are disordered, which is why essentially no light transmission is possible. There is a milky appearance. On the other hand, when voltage is applied to the corresponding liquid crystal cells, the liquid crystals align, whereby light can be transmitted.
Ferner ist es bekannt, bei Fahrzeugscheiben sogenannte SPD (Suspended Particle Device)-Folien einzusetzen, um eine Beschattungseinrichtung bereitzustellen. Eine SPD-Folie umfasst in einer entsprechenden Zelle kleine, stäbchenförmige Partikel, die in einen dünnen Kunststofffilm eingebunden und zunächst willkürlich ausgerichtet sind. Unter einem elektrischen Feld richten sich diese Partikel aus, so dass Licht transmittiert werden kann. Jedoch besteht das Problem, dass solche SPD-Folien nur in blau und nicht in einer neutralen Farbe herstellbar sind, die bei einem Kraftfahrzeug ohne weiteres eingesetzt werden kann. Furthermore, it is known to use so-called SPD (Suspended Particle Device) films in vehicle windows in order to provide a shading device. An SPD film comprises small, rod-shaped particles in a corresponding cell, which are embedded in a thin plastic film and initially aligned arbitrarily. Under an electric field, these particles align so that light can be transmitted. However, the problem is that such SPD films only in blue and not can be produced in a neutral color, which can be readily used in a motor vehicle.
Bisher besteht grundsätzlich das Problem, gewölbte Fahrzeugscheiben, insbesondere dreidimensional gewölbte Fahrzeugscheiben mit einer Flüssigkristallanordnung als Beschattungsanordnung zu versehen, die eine gleichmäßige Beschattung mit geringem Transmissionsgrad ermöglicht. So far, there is basically the problem of providing arched vehicle windows, in particular three-dimensionally curved vehicle windows, with a liquid crystal arrangement as a shading arrangement, which enables uniform shading with a low degree of transmission.
Der Erfindung liegt die Aufgabe zugrunde, eine Fahrzeugscheibe gemäß der einleitend genannten Gattung ausgebildete Fahrzeugscheibe zu schaffen, die eine Flüssigkristallanordnung mit gleichmäßigem Beschattungsverhalten auch bei einem dreidimensional gewölbten Scheibenkörper aufweist. The invention has for its object to provide a vehicle window according to the initially mentioned type formed vehicle window, which has a liquid crystal arrangement with uniform shading behavior even with a three-dimensionally curved disk body.
Diese Aufgabe ist erfindungsgemäß durch die Fahrzeugscheibe mit den Merkmalen des Patentanspruchs 1 gelöst. This object is achieved by the vehicle window with the features of claim 1.
Erfmdungsgemäß wird also eine Fahrzeugscheibe vorgeschlagen, die einen plattenartigen, planen oder gewölbten Scheibenkörper umfasst, der eine einer Fahrzeugumgebung zugewandte Außenseite und einer der Außenseite abgewandte Innenseite hat und an dessen Innenseite eine Beschattungsanordnung angeordnet ist, die aus einer Flüssigkristallanordnung gebildet ist, welche eine Flüssigkristallzelle umfasst. Die Flüssigkristallanordnung umfasst zwei Schichten aus biegsamem Dünnglas, zwischen denen die Flüssigkristallzelle angeordnet ist und zwischen denen Abstandshalter angeordnet sind, so dass die Flüssigkristallzelle über ihre Erstreckung eine zumindest weitgehend konstante Dicke hat. According to the invention, therefore, a vehicle window is proposed which comprises a plate-like, planar or curved window body which has an outer side facing away from the vehicle surroundings and an inner side facing away from the outer side and on the inner side of which a shading arrangement is formed, which is formed from a liquid crystal arrangement comprising a liquid crystal cell , The liquid crystal device comprises two layers of flexible thin glass, between which the liquid crystal cell is arranged and between which spacers are arranged, so that the liquid crystal cell has an at least substantially constant thickness over its extent.
Durch die Anordnung der Flüssigkristallzelle zwischen zwei biegsamen Dünnglasschichten kann die Flüssigkristallanordnung der insbesondere gewölbten Form des plattenartigen Scheibenkörpers folgen, der aus Glas oder einem Kunststoff, wie einem Polycarbonat oder PMMA bestehen kann. Bei der Montage der Fahrzeugscheibe nach der Erfindung ist damit eine gute Verformbarkeit der Flüssigkristallanordnung gewährleistet. Zudem kann eine homogene Dicke der Flüssigkristallzelle über ihre Erstreckung trotz Verformung der beiden Dünnglasschichten erzielt werden. Bei dem für die Flüssigkristallanordnung der Fahrzeugscheibe nach der Erfindung verwendeten Dünnglas handelt es sich insbesondere um ein chemisch vorgespanntes Glas, das der Gruppe der Alumosilikatgläser zugeordnet sein kann und biegsam ausgebildet ist. Ein solches Glas zeichnet sich durch eine hohe Bruch- und Kratzfestig- keit aus. By arranging the liquid crystal cell between two flexible thin glass layers, the liquid crystal device can follow the particular curved shape of the plate-like disk body, which can be made of glass or a plastic such as a polycarbonate or PMMA. When mounting the vehicle window according to the invention, a good deformability of the liquid crystal arrangement is ensured. In addition, a homogeneous thickness of the liquid crystal cell can be achieved over its extent despite deformation of the two thin glass layers. The thin glass used for the liquid crystal arrangement of the vehicle windshield according to the invention is, in particular, a chemically tempered glass, which may be assigned to the group of aluminosilicate glasses and is designed to be flexible. Such a glass is characterized by a high resistance to breakage and scratching.
Vorzugsweise haben die Schichten aus biegsamem Dünnglas jeweils eine Dicke von 0,1 mm bis 1,5 mm. Durch die geringen Schichtdicken kann das Gesamtgewicht der Fahrzeugscheibe nach der Erfindung niedrig gehalten werden. Preferably, the layers of flexible thin glass each have a thickness of 0.1 mm to 1.5 mm. Due to the low layer thicknesses, the total weight of the vehicle window can be kept low according to the invention.
Die Verwendung der Dünnglasschichten für die Flüssigkristallanordnung verhindert eine Feuchtediffusion durch die von den Dünnglasschichten gebildeten Substrate der Flüssigkristallanordnung. Zudem hat das Dünnglas eine hohe thermische und mechanische Stabilität. Damit kann Wölbungen und Welligkeiten, die in der Flüssigkristallzelle zu Flüssigkeitsansammlungen und/oder Fehlstellen führen könnten, entgegengewirkt werden. Des Weiteren kann die Flüssigkristallanordnung direkt die innere Sichtfläche der Fahrzeugscheibe nach der Erfindung bilden, da das Dünnglas an sich schon eine hohe optische Anmutung haben kann. The use of the thin glass layers for the liquid crystal device prevents moisture diffusion through the substrates of the liquid crystal device formed by the thin glass layers. In addition, the thin glass has a high thermal and mechanical stability. This can be counteracted bulges and ripples, which could lead to liquid accumulation and / or defects in the liquid crystal cell. Furthermore, the liquid crystal device can directly form the inner visible surface of the vehicle window according to the invention, since the thin glass itself can already have a high visual appearance.
Bei einer speziellen Ausfuhrungsform der Fahrzeugscheibe nach der Erfindung hat der Scheibenkörper entlang einer Scheibenlängsrichtung und entlang einer Scheibenquer- richtung jeweils eine Wölbung. Damit liegt eine dreidimensionale Wölbung des Scheibenkörpers vor. Die Wölbung kann jeweils einen Krümmungsradius zwischen 1.000 mm und 10.000 mm, vorzugsweise zwischen 2.000 mm und 5.000 mm haben. Über die Wölbung, das heißt in Scheibenquerrichtung und/oder in Scheibenlängsrichtung, kann der Krümmungsradius variieren, das heißt er muss in der jeweiligen Richtung nicht konstant sein. Auf den Dünnglasschichten ist innenseitig jeweils eine leitfähige Schicht zur elektrischen Anbindung der Flüssigkristallzellezweckmäßigerweise an das Bordnetz des betreffenden Fahrzeugs angeordnet. In a specific embodiment of the vehicle window according to the invention, the pane body has a curvature along a longitudinal direction of the pane and along a transverse direction of the pane. This results in a three-dimensional curvature of the disk body. The curvature can each have a radius of curvature between 1,000 mm and 10,000 mm, preferably between 2,000 mm and 5,000 mm. About the curvature, that is in the disk transverse direction and / or in the disk longitudinal direction, the radius of curvature can vary, that is, it must not be constant in the respective direction. On the thin-glass layers, in each case a conductive layer for the electrical connection of the liquid-crystal cell is arranged on the vehicle electrical system of the vehicle in question.
Zudem kann auf den beiden Dünnglasschichten innenseitig bzw. auf den leitfähigen Schichten jeweils eine Ausrichtungsschicht (alignment layer) angeordnet sein, die beispielsweise aus einem UV-härtenden Acrylat oder einem Polyimid gebildet sein kann. Diese dienen zur Vorausrichtung der Flüssigkristalle der Flüssigkristallzelle im nicht geschalteten Zustand. In addition, on the two thin glass layers on the inside or on the conductive layers in each case an alignment layer can be arranged, the for example, may be formed from a UV-curing acrylate or a polyimide. These serve to advance the liquid crystals of the liquid crystal cell in the non-switched state.
Die Flüssigkristallanordnung der Fahrzeugscheibe nach der Erfindung kann mit kurzen Schaltzeiten, die bei etwa einer Sekunde liegen, über einen weiten Temperaturbereich betrieben werden. Zudem kann eine geringe Spannung zur Betätigung der Flüssigkristallanordnung, das heißt zum Schalten zwischen einer Sperrstellung und einer Durchlassstellung, ausreichen. Die insbesondere als Wechselspannung ausgebildete Spannung kann unter 30 V liegen. Die Frequenz der Wechsel Spannung beträgt beispielsweise 60 Hz, kann aber je nach gewünschter Geschwindigkeit der Ausrichtung der Flüssigkristalle auch höher sein und bis zu 100 bis 120 Hz betragen oder auch niedriger sein. The liquid crystal device of the vehicle window according to the invention can be operated over a wide temperature range with short switching times of about one second. In addition, a low voltage for actuating the liquid crystal device, that is, for switching between a blocking position and a passage position, sufficient. The voltage, which is in particular designed as an alternating voltage, may be less than 30 V. The frequency of the AC voltage is for example 60 Hz, but may also be higher depending on the desired speed of the alignment of the liquid crystals and be up to 100 to 120 Hz or lower.
Des Weiteren bietet die Flüssigkristallanordnung der Fahrzeugscheibe nach der Erfindung im ungeschalteten Zustand eine sehr geringe Transmission, die für sichtbares Licht unter 1 % liegt. Die Farbe der Flüssigkristallanordnung ist beispielsweise grau, kann aber durch Beimischung von Farbstoffen kundenspezifisch angepasst werden. Furthermore, the liquid crystal arrangement of the vehicle window according to the invention in the unswitched state provides a very low transmission, which is less than 1% for visible light. For example, the color of the liquid crystal array is gray, but can be customized by incorporation of dyes.
Die Fahrzeugscheibe nach der Erfindung ist insbesondere ein Dachelement des betreffenden Fahrzeugs. Dieses Dachelement kann als Festdachelement, das starr mit dem Fahrzeugaufbau verbunden ist, oder auch als bewegliches Dachelement ausgebildet sein, das ein Deckelelement einer Schiebedachanordnung darstellt. The vehicle window according to the invention is in particular a roof element of the relevant vehicle. This roof element may be formed as a fixed roof element, which is rigidly connected to the vehicle body, or as a movable roof element, which constitutes a cover element of a sliding roof arrangement.
Um das Abschattungsverhalten der Fahrzeugscheibe nach der Erfindung weiter zu verbessern, ist bei einer bevorzugten Ausführungsform der Fahrzeugscheibe eine Polarisatorschicht vorgesehen. Die Polarisatorschicht ist vorzugsweise zwischen dem Scheibenkörper und der Flüssigkristallanordnung angeordnet, kann aber auch an der dem Scheibenkörper abgewandten Seite der Flüssigkristallanordnung angeordnet sein. Die Polarisatorschicht hat vorzugsweise unabhängig von der Anordnung eine Polarisationsrichtung, die rechtwinkelig zu einer Polarisationsrichtung der Flüssigkristallzelle in deren ungeschalteten Zustand ausgerichtet sein kann. Der geschaltete Zustand ist dann dem Transmissionszustand zugeordnet. Denkbar ist es aber auch, dass im ungeschalteten Zustand der Flüssigkristallezelle die Polarisationsrichtung der Polarisatorschicht parallel zur Polarisationsrichtung der Flüssigkristallzelle ist, so dass dann der Transmissionszustand der Anordnung vorliegt. In order to further improve the shading behavior of the vehicle window according to the invention, a polarizer layer is provided in a preferred embodiment of the vehicle window. The polarizer layer is preferably arranged between the disk body and the liquid-crystal arrangement, but may also be arranged on the side of the liquid-crystal arrangement facing away from the disk body. The polarizer layer preferably has, independently of the arrangement, a polarization direction which may be oriented at right angles to a polarization direction of the liquid crystal cell in its unswitched state. The switched state is then assigned to the transmission state. But it is also conceivable that in the unswitched state of the liquid crystal cell, the polarization direction of the polarizer layer is parallel to the polarization direction of the liquid crystal cell, so that then the transmission state of the arrangement is present.
Um durch unterschiedliches thermisches Ausdehnungsverhalten begründete Spannungen zwischen der Polarisatorschicht und der hieran angrenzenden Funktionsschicht, beispielsweise dem Scheibenkörper oder der Flüssigkristallanordnung, aufnehmen zu können, ist die Polarisatorschicht vorzugsweise über eine Längenausdehnungskompen- sationsschicht an diese Funktionsschicht angebunden. In order to be able to absorb stresses caused by different thermal expansion behavior between the polarizer layer and the adjoining functional layer, for example the disk body or the liquid crystal arrangement, the polarizer layer is preferably connected to this functional layer via a length expansion compensation layer.
Die Längenausdehnungskompensationsschicht, die vorzugsweise optisch isotrop ausgebildet ist, kann eine Acrylatschicht, eine Schicht aus thermoplastischem Po- lyurethan, eine Epoxidschicht, eine Silikonschicht oder auch eine Schicht aus einem vernetzenden Material, wie Ethylenvinylacetat (EVA) oder Polyvinylbutural (PVB) sein. Um hinreichend Spannungen aufnehmen zu können, hat die Längenausdehnungs- kompensationsschicht vorzugsweise eine Dicke von mindestens 0,2 mm, vorzugsweise von mindestens 0,4 mm. Um die Fahrzeugscheibe nach der Erfindung in einfacher Weise an den Fahrzeugaufbau, beispielsweise an eine Kinematik eines Schiebedachantriebs oder an einen Dachrahmen anbinden zu können, weist die Fahrzeugscheibe nach der Erfindung zweckmäßigerweise eine umlaufende Randumschäumung auf. In dieser können Einlegeteile, wie Befestigungslaschen oder ein Deckelinnenblech, eingebettet sein. Um Fahrzeuginsassen in einer Unfallsituation vor etwaigen Glassplittern zu schützen, kann die Fahrzeugscheibe nach der Erfindung eine Splitterschutzfolie aufweisen, die an der dem Scheibenkörper abgewandten Seite der Fahrzeugscheibe angeordnet ist. The length expansion compensation layer, which is preferably optically isotropic, may be an acrylate layer, a thermoplastic polyurethane layer, an epoxy layer, a silicone layer or else a layer of a crosslinking material, such as ethylene vinyl acetate (EVA) or polyvinyl butane (PVB). In order to be able to absorb sufficient stress, the length expansion compensation layer preferably has a thickness of at least 0.2 mm, preferably of at least 0.4 mm. In order to connect the vehicle window according to the invention in a simple manner to the vehicle body, for example to a kinematics of a sliding roof drive or to a roof frame, the vehicle window according to the invention expediently has a peripheral Randumschäumung. In this insert parts, such as fastening straps or an inner cover plate, be embedded. In order to protect vehicle occupants from accidental glass splinters in an accident situation, the vehicle window according to the invention may have a splinter protection film which is arranged on the side of the vehicle window facing away from the window body.
Um die Rückhaltefunktion der vorzugsweise kratz- und/oder reißfest ausgebildeten Splitterschutzfolie zu gewährleisten, ist diese vorzugsweise zumindest abschnittsweise von der umlaufenden Randumschäumung übergriffen bzw. in diese eingeschäumt. Die Splitterschutzfolie kann in einem zentralen Bereich der Scheibe angeklebt sein. In einem Randbereich kann die Splitterschutzfolie Perforationen für den Durchtritt der Randumschäumung aufweisen. Die Splitterschutzfolie ist beispielsweise aus einer mit Polysiloxan beschichteten Ethylenterephtalat-Folie (PET-Folie) gebildet. In order to ensure the retention function of the preferably scratch-resistant and / or tear-resistant splinter protection film, it is preferably at least partially overlapped by the circumferential edge foam or foamed into it. The shatter-proofing film can be glued in a central region of the pane. In an edge region, the splinter protection film can have perforations for the passage of the edge foam. The splinter protection film is formed, for example, from a polysiloxane-coated ethylene terephthalate film (PET film).
Die Anbindung der Splitterschutzfolie an die Flüssigkristallanordnung oder an die Polarisatorschicht kann über eine Klebefolie erfolgen, die aus einem Polyvinylbutyral- Film (PVB-Film) oder einer transparenten Polyurethan-Folie besteht. The splinter protection film can be bonded to the liquid crystal arrangement or to the polarizer layer via an adhesive film which consists of a polyvinyl butyral film (PVB film) or a transparent polyurethane film.
Bei einer speziellen Ausführungsform kann an der Innenseite der Fahrzeugscheibe ein Scheibeninnenkörper angeordnet sein, der aus Glas, insbesondere einem Dünnglas, oder aus einem Kunststoff, insbesondere aus Polycarbonat, gebildet ist. In a specific embodiment, a disk inner body may be arranged on the inside of the vehicle window, which is formed from glass, in particular a thin glass, or from a plastic, in particular from polycarbonate.
Der Einsatz von Kunststoff als Scheibenkörper und/oder als Scheibeninnenkörper vereinfacht sich dadurch, dass für die Flüssigkristallanordnung Dünnglasschichten als Substrat eingesetzt werden, die jeweils eine perfekte Barriereschicht bilden. Die an sich gegebenenfalls nicht hinreichenden Barriereeigenschaften des jeweiligen Kunststoffs können damit zumindest zum Teil vernachlässigt werden. The use of plastic as a disk body and / or as a disk inner body is simplified by the fact that thin glass layers are used as a substrate for the liquid crystal array, each forming a perfect barrier layer. The inherently insufficient barrier properties of the respective plastic can thus be at least partially neglected.
Eine spezielle Ausführungsform der Fahrzeugscheibe nach der Erfindung umfasst eine Lichtleiterschicht, die über ihren Rand mit einer Lichtquelle verbindbar ist oder über ihren Rand mit einer Lichtquelle verbunden ist. Die Lichtleiterschicht, die bei der Herstellung der Fahrzeugscheibe zusammen mit der Flüssigkristallanordnung und den etwaigen weiteren Schichten in einem einstufigen Prozess integriert werden kann, kann ein Beleuchtungssystem für den Innenraum des betreffenden Fahrzeugs darstellen. Insbesondere ist die Lichtleiterschicht Bestandteil einer sogenannten Ambient-Light- Beleuchtung des betreffenden Fahrzeugs. Bei dieser Ausführungsform sind also die Funktionalität der schaltbaren Flüssigkristallanordnung und die Funktionalität einer flächigen Beleuchtung, insbesondere einer Ambient-Light-Beleuchtung miteinander kombiniert. Zweckmäßigerweise sind die Lichtleiterschicht und die Flüssigkristallan- Ordnung separat und unabhängig ansteuerbar, d. h. so schaltbar, dass die Flüssigkristallanordnung ihren Transmissionszustand oder ihren Sperrzustand einnimmt und die Lichtleiterschicht leuchtet oder nicht leuchtet. A special embodiment of the vehicle window according to the invention comprises a light guide layer, which can be connected via its edge to a light source or is connected via its edge to a light source. The light guide layer, which can be integrated in a single-stage process during the manufacture of the vehicle window together with the liquid crystal arrangement and the possible further layers, can be an illumination system for the interior of the vehicle in question. In particular, the light guide layer is part of a so-called ambient light illumination of the vehicle in question. In this embodiment, therefore, the functionality of the switchable liquid crystal arrangement and the functionality of a planar illumination, in particular an ambient light illumination, are combined with one another. Conveniently, the optical fiber layer and the Flüssigkristallan- order are separately and independently controllable, d. H. switchable so that the liquid crystal device assumes its transmission state or its blocking state and the optical fiber layer is lit or not illuminated.
Beim Verbinden der einzelnen Schichten der Fahrzeugscheibe müssen die Prozessparameter so auf die Flüssigkristallanordnung und die Lichtleiterschicht abgestimmt sein, dass sowohl die Haftung der beiden Schichten als auch die Funktion beider Schichten gewährleistet ist. When connecting the individual layers of the vehicle window, the process parameters must be matched to the liquid crystal arrangement and the light guide layer, that both the adhesion of the two layers and the function of both layers is ensured.
Bei einer speziellen Ausführungsform der Fahrzeugscheibe nach der Erfindung ist die Lichtleiterschicht an der der Fahrzeugumgebung abgewandten Seite der Flüssigkristall- anordnung angeordnet. Dies bedeutet, dass die Lichtleiterschicht unabhängig vomIn a special embodiment of the vehicle window according to the invention, the light guide layer is arranged on the side facing away from the vehicle surroundings of the liquid crystal arrangement. This means that the light guide layer is independent of
Schaltzustand der Flüssigkristallanordnung vom Innenraum des betreffenden Fahrzeugs sichtbar ist, wenn sie aktiviert ist. Switching state of the liquid crystal device from the interior of the vehicle in question is visible when it is activated.
Insbesondere kann die Lichtleiterschicht eine innere Sichtfläche der Fahrzeugscheibe bilden. Die Lichtleiterschicht kann aus beliebigen geeigneten Werkstoffen gefertigt sein. In particular, the light guide layer can form an inner visible surface of the vehicle window. The light guide layer may be made of any suitable materials.
Insbesondere kann die Lichtleiterschicht einen flächigen Glaskörper umfassen, der den Vorteil bietet, dass auf weitere Schutzschichten an der Innenseite der Fahrzeugscheibe gegebenenfalls verzichtet werden kann.  In particular, the optical waveguide layer may comprise a planar glass body, which offers the advantage that it may be possible to dispense with further protective layers on the inner side of the vehicle window.
Bei einer alternativen Ausführungsform der Fahrzeugscheibe nach der Erfindung kann die Lichtleiterschicht eine Kunststofffolie und/oder eine Kunststoffplatte umfassen. Dies ist insbesondere vorteilhaft, wenn die Fahrzeugscheibe gewichtsoptimiert ausgebildet sein soll. In an alternative embodiment of the vehicle window according to the invention, the light guide layer may comprise a plastic film and / or a plastic plate. This is particularly advantageous if the vehicle window should be designed weight-optimized.
Um der Lichtleiterschicht spezielle gewünschte Leuchteigenschaften verleihen zu können, enthält sie vorzugsweise Streuzentren, die insbesondere von Nanopartikeln gebildet sein können. Die Streuzentren sind insbesondere homogen in der Lichtleiterschicht verteilt. In order to be able to give the optical waveguide layer specific desired luminous properties, it preferably contains scattering centers, which in particular can be formed by nanoparticles. The scattering centers are distributed in particular homogeneously in the light guide layer.
Bei einer weiteren speziellen Ausführungsform der Fahrzeugscheibe nach der Erfindung weist die Lichtleiterschicht eine Bedruckung auf, welche beispielsweise ein Leuchtmuster vorgibt und auch als Reflexionsschicht dienen kann. Denkbar ist es auch, dass die Flüssigkristallanordnung eine Reflexionsschicht aufweist. In a further specific embodiment of the vehicle window according to the invention, the optical waveguide layer has a printing which, for example, specifies a luminous pattern and can also serve as a reflection layer. It is also conceivable that the liquid crystal arrangement has a reflection layer.
Zum Schutz vor Beschädigungen kann die Lichtleiterschicht des Weiteren eine Kratz- festbeschichtung aufweisen. Grundsätzlich kann die Fertigung der Fahrzeugscheibe nach der Erfindung auf unterschiedliche Art und Weise erfolgen. Beispielsweise werden die einzelnen Schichten der Fahrzeugscheibe nach einem Vakuumlaminations- bzw. Autoklavprozess verbunden, wobei der Verbund aus den einzelnen Schichten bestimmten Drücken und bestimmten Temperaturen ausgesetzt wird. Insbesondere können hierbei adhäsive Kunststofffolien als Längenausdehnungskompensationsschichten eingesetzt werden, die durch thermoplastische oder vernetzende Eigenschaften bei einer Erwärmung einen Verbund mit den anderen Schichten, das heißt mit dem Scheibenkörper, der Flüssigkristallanordnung, der Polarisatorschicht und/oder dem Scheibeninnenkörper eingehen. Bei einer speziellen Vakuumlamination findet eine einseitige Erwärmung des Verbunds durch eine Heizplatte statt, wobei eine Druckbeaufschlagung über eine Druckdifferenz in einer Kammer erfolgt, die durch eine Membran zweigeteilt ist. Bei einer Fertigung in einer Autokla- venkammer wird das Laminat allumseitig mittels zirkulierender Luft erwärmt. Es können Luftdrücke bis zu etwa 15 bar eingestellt werden. Alternativ kann die Herstellung der Fahrzeugscheibe nach der Erfindung nach einem so genannten Optical-Bonding- Verfahren erfolgen, bei dem optisch hochtransparente und vergilbungsfreie Klebstoffe als Längenausdehnungskompensationsschichten eingesetzt werden. Insbesondere können Silikone eingesetzt werden, die eine hohe Temperaturstabilität haben und später zerstörungsfrei abgelöst werden könnten. Auch könnten Polyurethane, Acrylate oder Epoxide eingesetzt werden. To protect against damage, the optical waveguide layer may further comprise a scratch-resistant coating. In principle, the production of the vehicle window according to the invention can take place in different ways. For example, the individual layers of the vehicle window are connected after a vacuum lamination or autoclave process, whereby the composite of the individual layers is exposed to specific pressures and temperatures. In particular, in this case adhesive plastic films can be used as Längenausdehnungskompensationsschichten that undergo thermoplastic or crosslinking properties in a heating compound with the other layers, that is with the disk body, the liquid crystal array, the polarizer layer and / or the disc inner body. In a special Vakuumlamination takes place a one-sided heating of the composite by a hot plate, wherein a pressurization takes place via a pressure difference in a chamber which is divided into two by a membrane. When manufactured in an autoclave chamber, the laminate is heated on all sides by means of circulating air. Air pressures up to about 15 bar can be set. Alternatively, the manufacture of the vehicle window according to the invention can take place by a so-called optical bonding method, in which optically highly transparent and non-yellowing adhesives are used as length expansion compensation layers. In particular, silicones can be used which have a high temperature stability and could later be removed without destruction. Also, polyurethanes, acrylates or epoxides could be used.
Die Erfindung hat auch ein Verfahren zur Herstellung einer Fahrzeugscheibe zum Gegenstand, umfassend folgende Schritte: The invention also relates to a method for producing a vehicle window, comprising the following steps:
- Erstellen eines Aufbaus aus mehreren Schichten in gestapelter Form in einem Rahmen, wobei der Aufbau einen Scheibenkörper, eine Flüssigkristallanordnung, die eine Flüssigkristallzelle und zwei Schichten aus biegsamen Dünnglas umfasst, zwischen denen die Flüssigkristallzelle angeordnet ist, und eine Längenausdehnungskompensati- onsschicht zwischen der Flüssigkristallanordnung und dem Scheibenkörper umfasst, wobei zumindest die Flüssigkristallanordnung und die Längenausdehnungs- Kompensationsschicht in einem Rahmen angeordnet werden, der deren Relativlage definiert;  - Creating a structure of a plurality of layers in a stacked form in a frame, the structure comprising a disk body, a liquid crystal device comprising a liquid crystal cell and two layers of flexible thin glass, between which the liquid crystal cell is disposed, and a Längenausdehnungskompensati- onsschicht between the liquid crystal array and the disk body comprises, wherein at least the liquid crystal array and the length expansion compensating layer are arranged in a frame defining their relative position;
- Einbringen des Aufbaus mit dem Rahmen in einen Vakuumbeutel; - Entlüften des Vakuumbeutels und Ausüben eines Drucks auf den Vakuumbeutel, so dass die Schichten des Aufbaus miteinander verbunden werden; - Introducing the structure with the frame in a vacuum bag; Deaerating the vacuum bag and applying a pressure to the vacuum bag so that the layers of the structure are connected together;
- Entnehmen des verfügten Aufbaus aus dem Vakuumbeutel.  - Remove the assembled structure from the vacuum bag.
Durch das so realisierte Verfahren ist es möglich, die Schichten des Aufbaus der Fahrzeugscheibe sauber und positionsgenau miteinander zu verfügen und somit ohne weitere Prozessschritte eine Fahrzeugscheibe zu realisieren, die an dem betreffenden Fahrzeug einsetzbar ist. By the method thus realized, it is possible to dispose the layers of the structure of the vehicle window cleanly and accurately with each other and thus to realize without further process steps a vehicle window, which is applicable to the vehicle in question.
Um das Verfügen der einzelnen Schichten des Aufbaus zu verbessern und/oder zu beschleunigen, wird der in dem Vakuumbeutel angeordnete Aufbau erwärmt, während er dem Druck ausgesetzt wird. Die Temperaturen, auf die der Aufbau erwärmt wird, liegen beispielsweise zwischen 50 °C und 150 °C. Der Druck, der auf den Vakuumbeutel ausgeübt wird, liegt vorzugsweise in einem Bereich zwischen 1 bar und 20 bar, insbesondere zwischen 1 bar und 12 bar. Dieser Prozess kann in einer Autoklavenkammer durchgeführt werden. Um den Aufbau in dem Rahmen zu stabilisieren, kann er mit einer Druckplatte abgedeckt werden. Die Druckplatte stellt eine Hilfsstruktur dar, die gewährleistet, dass die einzelnen Schichten des Aufbaus während des Fügeprozesses ihre Form beibehalten. In order to improve and / or accelerate the provision of the individual layers of the structure, the structure arranged in the vacuum bag is heated while being subjected to the pressure. The temperatures at which the structure is heated, for example, between 50 ° C and 150 ° C. The pressure exerted on the vacuum bag is preferably in a range between 1 bar and 20 bar, in particular between 1 bar and 12 bar. This process can be carried out in an autoclave chamber. To stabilize the structure in the frame, it can be covered with a pressure plate. The pressure plate provides an auxiliary structure which ensures that the individual layers of the structure maintain their shape during the joining process.
Der Aufbau kann entsprechend der Fahrzeugscheibe nach der Erfindung eine Polarisatorschicht und/oder eine Lichtleiterschicht aufweisen. Bei Integration einer Lichtleiterschicht in den Aufbau kann durch Nutzung des Verfahrens nach der Erfindung in einem einstufigen Prozess sowohl eine schaltbare Beschattungseinrichtung in Form der Flüssigkristallanordnung als auch ein Flächenleuchtsys- tem in Form der Lichtleiterschicht in die Fahrzeugscheibe integriert werden. The structure may according to the vehicle window according to the invention comprise a polarizer layer and / or a light guide layer. When integrating a light guide layer into the structure, by using the method according to the invention in a single-stage process, both a switchable shading device in the form of the liquid crystal arrangement and a surface illumination system in the form of the light guide layer can be integrated into the vehicle window.
Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Beschreibung, der Zeichnung und den Patentansprüchen entnehmbar. Further advantages and advantageous embodiments of the subject matter of the invention are the description, the drawings and the claims removed.
Ausführungsbeispiele einer Fahrzeugscheibe nach der Erfindung sind in der Zeichnung schematisch vereinfacht dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigt: Figur 1 eine Draufsicht auf ein Fahrzeugdach mit einer Fahrzeugscheibe nach der Erfindung; Embodiments of a vehicle window according to the invention are shown schematically simplified in the drawing and are explained in more detail in the following description. It shows: Figure 1 is a plan view of a vehicle roof with a vehicle window according to the invention;
Figur 2 einen Schnitt durch die Fahrzeugscheibe, der den Schichtaufbau Figure 2 shows a section through the vehicle window, the layer structure
derselben zeigt;  the same shows;
Figur 3 einen Schnitt durch eine zweite Ausführungsform einer Fahrzeugscheibe nach der Erfindung; 3 shows a section through a second embodiment of a vehicle window according to the invention;
Figur 4 einen Schnitt durch eine dritte Ausführungsform einer Fahrzeugscheibe nach der Erfindung; Figure 4 is a section through a third embodiment of a vehicle window according to the invention;
Figur 5 einen Schnitt durch eine vierte Ausführungsform einer Fahrzeugscheibe nach der Erfindung; Figure 5 is a section through a fourth embodiment of a vehicle window according to the invention;
Figur 6 einen Schnitt durch eine fünfte Ausführungsform einer Fahrzeugscheibe nach der Erfindung; Figure 6 is a section through a fifth embodiment of a vehicle window according to the invention;
Figur 7 einen Schnitt durch eine sechste Ausführungsform einer Fahrzeugscheibe nach der Erfindung; Figure 7 is a section through a sixth embodiment of a vehicle window according to the invention;
Figur 8a bis e die Herstellung der Fahrzeugscheibe nach Figur 7; Figure 8a to e the manufacture of the vehicle window according to Figure 7;
Figur 9 einen Schnitt durch eine siebte Ausführungsform einer Fahrzeugscheibe nach der Erfindung; und 9 shows a section through a seventh embodiment of a vehicle window according to the invention; and
Figur 10a bis e die Herstellung der Fahrzeugscheibe nach Figur 9. FIGS. 10a to e show the manufacture of the vehicle window according to FIG. 9.
In Figur 1 ist ein Fahrzeugdach 10 eines ansonsten nicht näher dargestellten Kraftfahrzeugs gezeigt. Das Fahrzeugdach 10 ist ein Panoramadach, das mit einem verstellbaren Deckelelement 12 eines Schiebedachs und einem Festdachelement 14 versehen ist, das starr an den Aufbau des Kraftfahrzeuges angebunden ist. Das Deckelelement 12 und das Festfachelement 14 sind jeweils als Glaselement und mithin als Fahrzeugscheibe ausgebildet. Zudem haben das Deckelelement 12 und das Festdachelement 14 jeweils den gleichen Schichtaufbau, der mit einer Beschattungsanordnung versehen ist und der anhand Figur 2 dargestellt ist. Die jeweils als Fahrzeugscheibe ausgebildeten Dachelemente 12 und 14 bilden jeweils eine Scheibenanordnung, die einen Scheibenkörper 16, der aus einer entlang einer Scheibenlängsrichtung und entlang einer Scheibenquerrichtung jeweils gewölbten Glasplatte gebildet ist und die Außenhaut der jeweiligen Fahrzeugscheibe bildet. An der Innenseite des Scheibenkörpers 16 ist über eine Längenausdehnungskompensations- schicht 18 mit adhäsiven Eigenschaften eine Polarisatorschicht 20 angebunden, die einen linear Polarisator umfasst. Die Längenausdehnungskompensationsschicht 18 kann aus thermoplastischen Polyurethan, Polyvinylbutyral, Ethylenvinylacetat-Copolymer oder dergleichen gebildet sein. Die Polarisatorschicht 20 ist wiederum auf eine Flüssigkristallanordnung 22 aufgebracht, die eine flächige Beschattungsanordnung der Fahrzeugscheibe bildet. An der Innenseite, d. h. an der dem Scheibenkörper 16 abgewandten Seite ist die Flüssigkristallanordnung 22 des Weiteren mit einer Splitterschutzfolie 24 versehen. Die Splitterschutzfolie 24 besteht aus einer mit Polysiloxan beschichteten Polyethylenterephthalat- Folie. FIG. 1 shows a vehicle roof 10 of a motor vehicle, which is not shown in detail. The vehicle roof 10 is a panoramic roof, which is provided with an adjustable cover element 12 of a sunroof and a fixed roof element 14 which is rigidly connected to the structure of the motor vehicle. The lid member 12 and the fixed compartment member 14 are each formed as a glass element and thus as a vehicle window. In addition, the cover element 12 and the fixed roof element 14 each have the same layer structure, which is provided with a shading arrangement and which is illustrated with reference to FIG. Each formed as a vehicle window roof panels 12 and 14 each form a disc assembly, which is a disc body 16 which is formed of a along a disc longitudinal direction and along a disc transverse direction in each case curved glass plate and the outer skin of the respective vehicle window. On the inside of the disk body 16, a polarizer layer 20, which comprises a linear polarizer, is connected via a length expansion compensation layer 18 with adhesive properties. The length-expansion compensating layer 18 may be formed of thermoplastic polyurethane, polyvinyl butyral, ethylene-vinyl acetate copolymer or the like. The polarizer layer 20 is in turn applied to a liquid crystal array 22, which forms a flat shading arrangement of the vehicle window. On the inside, ie on the side facing away from the disk body 16 side, the liquid crystal assembly 22 is further provided with a splinter protection film 24. The anti-shatter film 24 consists of a polysiloxane-coated polyethylene terephthalate film.
Die Polarisatorschicht 20 hat eine Polarisationsrichtung, die rechtwinklig zu der Polarisationsrichtung der Flüssigkristallzelle 32 in deren Sperrstellung ausgerichtet ist. The polarizer layer 20 has a polarization direction which is oriented at right angles to the polarization direction of the liquid crystal cell 32 in its blocking position.
Die das Deckelelement 12 und das Festdachelement 14 bildenden Fahrzeugscheiben weisen zu dem jeweils eine umlaufende Randumschäumung 26 auf, die die Splitter- schutzfolie 24 an der Innenseite der jeweiligen Fahrzeugscheibe übergreift und die aus einem Polyurethan-Schaum gebildet ist. The vehicle windows forming the cover element 12 and the fixed roof element 14 have in each case an encircling edge foam 26, which engages over the splinter protection film 24 on the inside of the respective vehicle window and which is formed from a polyurethane foam.
Die Flüssigkristallanordnung 22 umfasst zwei Schichten 28 und 30 aus Dünnglas mit einer Dicke von etwa 0,5 mm. Das jeweilige Dünnglas ist ein chemisch vorgespanntes Glas und biegsam ausgebildet. Zwischen den beiden Schichten 28 und 30 ist eine einzige Flüssigkristallzelle 32 angeordnet. An den Innenseiten der beiden Schichten 28 und 30 ist jeweils eine leitfähige Schicht zur elektrischen Anbindung der Flüssigkristallzelle an ein Bordnetz des Fahrzeugs angeordnet. Auf den leitfähigen Schichten ist jeweils zweckmäßigerweise eine Ausrichtungsschicht (alignment layer) angeordnet. Die Ausrichtungsschichten, die aus einem Polyimid oder einem UV-härtenden Acrylat gebildet sein können, begrenzen jeweils die Flüssigkristallzelle 32 und dienen zur Vorausrichtung der Flüssigkristalle in der Flüssigkristallzelle im nicht geschalteten Zustand. Zudem sind die beiden Ausrichtungsschichten durch nicht näher dargestellte Abstandshalter 33 voneinander getrennt, so dass die Dicke der Flüssigkristallzelle 32, in der die Flüssigkristalle angeordnet sind, über die Erstreckung der Flüssigkristallanord- nung zumindest weitgehend konstant ist. The liquid crystal array 22 comprises two thin glass layers 28 and 30 having a thickness of about 0.5 mm. The respective thin glass is a chemically toughened glass and flexible. Between the two layers 28 and 30, a single liquid crystal cell 32 is arranged. On the inner sides of the two layers 28 and 30, a conductive layer for electrical connection of the liquid crystal cell to an electrical system of the vehicle is arranged in each case. A respective alignment layer is expediently arranged on the conductive layers. The alignment layers, which may be formed of a polyimide or a UV-curing acrylate, respectively limit the liquid crystal cell 32 and serve for Pre-alignment of the liquid crystals in the liquid crystal cell in the non-switched state. In addition, the two alignment layers are separated from one another by spacers 33, not shown in more detail, so that the thickness of the liquid crystal cell 32 in which the liquid crystals are arranged is at least substantially constant over the extent of the liquid crystal arrangement.
Die Polarisatorschicht 20 ist vor dem Anbinden an den Scheibenkörper 16 über einen einfachen Rollenprozess direkt auf die Flüssigkristallanordnung 22 bzw. die Dünnglass- schicht 28 der Flüssigkristallanordnung 22 auflaminiert. Die Splitterschutzfolie wird direkt auf die Innenseite der Flüssigkristallanordnung 22 auflaminiert, und zwar vor dem Anbinden der dann aus der Polarisatorschicht 20, der Flüssigkristallanordnung 22 und der Splitterschutzfolie 24 bestehenden Einheit an den Scheibenkörper 16. Beim Anbinden dieser Einheit an den Scheibenkörper 16 wird diese entsprechend der dreidimensionalen Wölbung des Scheibenkörpers 16 gebogen und damit an die Wölbung des Scheibenkörpers 16 angepasst. In Figur 3 ist eine alternative Ausführungsform einer Fahrzeugscheibe 40 dargestellt, die sich von der in Figur 2 dargestellten Fahrzeugscheibe dadurch unterscheidet, dass sie eine Polarisatorschicht 20 aufweist, die direkt auf die Innenseite des die Außenhaut bildenden Scheibenkörpers 16 auflaminiert ist. Die Polarisatorschicht 20 ist über eine Längenausdehnungskompensationsschicht 18, die aus einer Acrylatschicht, einer Schicht aus thermoplastischen Polyurethan, einer Epoxidschicht, einer Silikonschicht oder aus einer Schicht aus einem vernetzenden Material, wie Ethylenvinylacetat (EVA) oder Polyvinylbutyral (PVB) gebildet ist, mit einer gebogenen Flüssigkristallanordnung 22 verbunden, die der in Figur 1 dargestellten Flüssigkristallanordnung entspricht. An der Innenseite der Flüssigkristallanordnung 22, die als Substrate jeweils eine gebogene Dünnglasschicht 28 und 30 aufweist, die eine Flüssigkristallzelle 32 begrenzt, ist ebenfalls eine Splitterschutzfolie 24 der in Figur 2 dargestellten Art angeordnet. Zudem weist auch die Fahrzeugscheibe 40 nach Figur 3 eine umlaufende Randumschäumung 26 aus einem Polyurethanschaum auf. Zwischen den Dünnglasschichten 28 und 30 sind Abstandshalter 33 angeordnet. Denkbar ist es auch, dass die Polarisationsschicht 18 sowohl an den Scheibenkörper 16 als auch an die Flüssigkristallanordnung 22 jeweils über eine Längenausdehnungskom- pensationsschicht der vorstehend beschriebenen Art verbunden ist. Before being bonded to the disk body 16, the polarizer layer 20 is laminated directly onto the liquid crystal arrangement 22 or the thin glass layer 28 of the liquid crystal arrangement 22 via a simple roller process. The anti-splintering film is laminated directly to the inside of the liquid crystal array 22, prior to bonding the then consisting of the polarizer layer 20, the liquid crystal array 22 and the splinter protection film 24 unit to the disk body 16. When connecting this unit to the disk body 16, this is according to the curved three-dimensional curvature of the disk body 16 and thus adapted to the curvature of the disk body 16. FIG. 3 shows an alternative embodiment of a vehicle window 40 which differs from the vehicle window illustrated in FIG. 2 in that it has a polarizer layer 20 which is laminated directly onto the inside of the pane body 16 forming the outer skin. The polarizer layer 20 is bent over a length expansion compensation layer 18 formed of an acrylate layer, a thermoplastic polyurethane layer, an epoxy layer, a silicone layer, or a layer of a crosslinking material such as ethylene vinyl acetate (EVA) or polyvinyl butyral (PVB) Liquid crystal device 22 which corresponds to the liquid crystal device shown in Figure 1. On the inside of the liquid crystal arrangement 22, which has as substrates in each case a bent thin glass layer 28 and 30 which delimits a liquid crystal cell 32, a splinter protection film 24 of the type shown in FIG. 2 is likewise arranged. In addition, the vehicle window 40 according to FIG. 3 also has a peripheral edge foam 26 made from a polyurethane foam. Between the thin glass layers 28 and 30 spacers 33 are arranged. It is also conceivable for the polarization layer 18 to be connected both to the disk body 16 and to the liquid crystal arrangement 22 via a length expansion compensation layer of the type described above.
In Figur 4 ist eine weitere Ausführungsform einer Fahrzeugscheibe 50 dargestellt, die ebenfalls weitgehend der Fahrzeugscheibe nach Figur 2 entspricht, sich von dieser aber dadurch unterscheidet, dass eine Flüssigkristallanordnung 22, die ebenfalls entsprechend der Ausführangsform nach Figur 2 zwei Schichten 28 und 30 aus gebogenem Dünnglas umfasst, die eine Flüssigkristallzelle 32 begrenzen, über eine Längenausdeh- nungskompensationsschicht 18 direkt an einen die Außenhaut bildenden Scheibenkör- per 16 angebunden ist. An der Innenseite, d. h. an der dem Scheibenkörper 16 abgewandten Seite, ist auf die Flüssigkristallanordnung 22 eine Polarisatorschicht 20 auflaminiert, auf welche wiederum eine Splitterschutzfolie 24 aufiaminiert ist. Die Splitterschutzfolie 24 ist entsprechend den oben beschriebenen Ausführungsformen an Ihren Rändern von einer umlaufenden Polyurethan-Randumschäumung der Fahrzeug- scheibe 50 übergriffen. FIG. 4 shows a further embodiment of a vehicle window 50, which likewise largely corresponds to the vehicle window according to FIG. 2, but differs therefrom in that a liquid crystal arrangement 22, which likewise has two layers 28 and 30 of bent thin glass, corresponding to the embodiment of FIG which bound a liquid crystal cell 32 is connected via a length expansion compensation layer 18 directly to a disk body 16 forming the outer skin. On the inside, d. H. on the side facing away from the disk body 16, a polarizer layer 20 is laminated onto the liquid crystal device 22, to which in turn a splinter protection film 24 is laminated. The splinter protection film 24 is overlapped according to the embodiments described above at their edges by a circumferential polyurethane edge foam of the vehicle pulley 50.
In Figur 5 ist eine weitere Ausführungsform einer Fahrzeugscheibe 60 nach der Erfindung dargestellt. Die Fahrzeugscheibe 60 unterscheidet sich von der Fahrzeugscheibe nach Figur 2 dadurch, dass sie an der Innenseite keine Splitterschutzfolie aufweist. Vielmehr ist über eine weitere Längenausdehnungskompensationsschicht 62 mit adhäsiven Eigenschaften eine weitere Schicht 64 aus gebogenem Dünnglas auf dieFIG. 5 shows a further embodiment of a vehicle window 60 according to the invention. The vehicle window 60 differs from the vehicle window according to FIG. 2 in that it has no anti-shatter protection film on the inside. Rather, a further layer 64 of bent thin glass is on another length expansion compensation layer 62 with adhesive properties on the
Flüssigkristallanordnung 22 auflaminiert. Dieses Dünnglas bildet die innere Sichtfläche der Fahrzeugscheibe 60. Liquid crystal assembly 22 laminated. This thin glass forms the inner visible surface of the vehicle window 60.
In Figur 6 ist eine weitere Ausf hrungsform einer Fahrzeugscheibe 70 nach der Erfindung dargestellt. Die Fahrzeugscheibe 70 unterscheidet sich von der Fahrzeugscheibe nach Figur 5 dadurch, dass sie einen Scheibenkörper 16' aus einem Kunststoffwerkstoff, wie einem Polycarbonat, umfasst. Zudem weist sie an der Innenseite ebenfalls anstelle einer Glasschicht eine Schicht 64' aus einem Kunststoffwerkstoff, wie Polycarbonat, auf. Im Übrigen entspricht die Fahrzeugscheibe 70 der Fahrzeugscheibe nach Figur 5. In Figur 7 ist eine alternative Fahrzeugscheibe 100 zur Nutzung bei einem Deckelelement oder einem Festdachelement der in Figur 1 dargestellten Art gezeigt. Die eine Scheibenanordnung bildende Fahrzeugscheibe 100 weist einen Scheibenkörper 16 auf, der eine dreidimensionale Wölbung aufweisen kann und an den innenseitig über eine Längenausdehnungskompensationsschicht 18, die adhäsive Eigenschaften aufweist, eine Flüssigkristallanordnung 22 angebunden ist. Entsprechend den obigen Ausführungsformen umfasst die Flüssigkristallanordnung 22 zwei Schichten 28 und 30 aus Dünnglas, zwischen denen eine einzige Flüssigkristallzelle 32 und Abstandshalter 33 angeordnet sind. Entsprechend sind an den Innenseiten der Folien 28 und 30 leitfähige Schichten angeordnet, die über eine entsprechende, nicht näher dargestellte Kontaktie- rung mit dem Bordnetz des betreffenden Fahrzeugs verbindbar sind. Damit kann die Flüssigkristallzelle 32 zwischen einem Transmissionszustand und einem Sperrzustand hin und her geschaltet werden. FIG. 6 shows a further embodiment of a vehicle window 70 according to the invention. The vehicle window 70 differs from the vehicle window according to FIG. 5 in that it comprises a window body 16 'made of a plastic material, such as a polycarbonate. In addition, it also has on the inside, instead of a glass layer, a layer 64 'of a plastic material, such as polycarbonate. Incidentally, the vehicle window 70 corresponds to the vehicle window according to FIG. 5. FIG. 7 shows an alternative vehicle window 100 for use with a cover element or a fixed roof element of the type shown in FIG. The vehicle window pane 100 forming a pane arrangement has a pane body 16, which may have a three-dimensional curvature and to which a liquid crystal arrangement 22 is attached on the inside via a length expansion compensation layer 18, which has adhesive properties. According to the above embodiments, the liquid crystal device 22 comprises two thin glass layers 28 and 30 between which a single liquid crystal cell 32 and spacers 33 are interposed. Correspondingly, conductive layers 28 and 30 are arranged on the insides of the foils and can be connected to the vehicle electrical system of the vehicle in question via a corresponding contact-connection, not shown in more detail. Thus, the liquid crystal cell 32 can be switched between a transmission state and a blocking state.
An die Flüssigkristallanordnung 22 ist wiederum über eine weitere Längenausdeh- nungskompensationsschicht 102 eine Lichtleiterschicht 80 angebunden, welche aus einer dünnen Kunststoffplatte aus PMMA (Polymethylmetaacrylat) oder dergleichen gebildet ist, in der zur Erzeugung von Streuzentren Nanopartikel eingebettet sind. An der Innenseite, das heißt der dem Fahrzeuginnenraum zugewandten Seite ist die Lichtleiterschicht 80 zudem mit einer Kratzfestbeschichtung (Hard Coat) 82 versehen. Die Lichtleiterschicht 80 ist über ihren umlaufenden Rand mit einer Lichtquelle 81 verbunden, so dass in einem entsprechenden Schaltzustand der Lichtquelle Licht in die Lichtleiterschicht 80 eingekoppelt werden kann und diese damit als Beleuchtung für den betreffenden Fahrzeuginnenraum genutzt werden kann. An optical waveguide layer 80, which is formed from a thin plastic plate made of PMMA (polymethyl methacrylate) or the like, in which nanoparticles are embedded to produce scattering centers, is in turn connected to the liquid crystal arrangement 22 via a further length expansion compensation layer 102. On the inside, ie the side facing the vehicle interior, the light guide layer 80 is also provided with a scratch-resistant coating (hard coat) 82. The light guide layer 80 is connected via its peripheral edge with a light source 81, so that in a corresponding switching state of the light source, light can be coupled into the light guide layer 80 and thus can be used as lighting for the relevant vehicle interior.
Die Längenausdehnungskompensationsschichten 18 und 102 sind entsprechend den Längenausdehnungskompensationsschichten der Ausführungsform nach Figur 2 ausgebildet. The length-expansion compensating layers 18 and 102 are formed corresponding to the length-expansion compensating layers of the embodiment of FIG.
Des Weiteren ist bei dem Schichtaufbau nach Figur 7 zusätzlich eine Polarisatorschicht 20 zwischen der Flüssigkristallanordnung 22 und der Lichtleiterschicht 80 angeordnet. Die Polarisatorschicht 20 ist auf die Flüssigkristallanordnung 20 auf laminiert und kann alternativ auch zwischen der Flüssigkristallanordnung 22 und dem Scheibenkörper 16 angeordnet sein. Furthermore, in the layer structure according to FIG. 7, a polarizer layer 20 is additionally arranged between the liquid crystal arrangement 22 and the light guide layer 80. The polarizer layer 20 is laminated on the liquid crystal device 20 and can Alternatively, between the liquid crystal array 22 and the disk body 16 may be arranged.
Wie sich aus den vorstehenden Ausführungen ergibt, sind also bei dem in Figur 7 dargestellten Schichtaufbau zwei Funktionalitäten integriert, nämlich einerseits eine Beschattungsfunktionalität in Form der schaltbaren Flüssigkristallanordnung 22 zusammen mit der Polarisatorschicht 20 und zum anderen eine Beleuchtungsfunktionalität in Form der Lichtleiterschicht 80. Beide Funktionalitäten sind separat voneinander steuerbar. As can be seen from the above explanations, therefore, two functionalities are integrated in the layer structure shown in FIG. 7, namely on the one hand a shading functionality in the form of the switchable liquid crystal arrangement 22 together with the polarizer layer 20 and on the other hand an illumination functionality in the form of the light guide layer 80. Both functionalities are separately controllable.
Die Herstellung der in Figur 7 dargestellten Scheibenanordnung 100, die einen Lamina- tionsaufbau bildet, erfolgt in nachfolgend beschriebener Weise und ist anhand Figur 8 dargestellt. The production of the disk arrangement 100 shown in FIG. 7, which forms a laminate structure, takes place in the manner described below and is illustrated with reference to FIG.
Zunächst werden die Lichtleiterschicht 80, die Flüssigkristallanordnung 22 mit der Polarisatorschicht 20 und die Längenausdehnungskompensationsschichten 18 und 102 bereitgestellt (Figur 8a) und dann in gestapelter Form in einem Rahmen 84 angeordnet und auf den Scheibenkörper 16 aufgelegt. Der Rahmen 84 besteht aus PTFE. Zudem wird auf die oben angeordnete Lichtleiterschicht 80, die mit der Kratzfestbeschichtung 82 versehen ist, eine Druckplatte 86 aufgelegt, so dass eine innige Verbindung zwischen den einzelnen auf den Scheibenkörper 16 aufgelegten Schichten besteht (Figur 8b). Anschließend wird der Rahmen zusammen mit dem Schichtaufbau, der den Scheiben- körper 16, die Längenausdehnungskompensationsschichten 18 und 102, die Flüssigkristallanordnung 22, die Polarisatorschicht 20, die Lichtleiterschicht 80 und die Druckplatte 46 umfasst, in einen Vakuumbeutel 98 eingebracht (Figur 8c). First, the light guide layer 80, the liquid crystal array 22 with the polarizer layer 20, and the length expansion compensating layers 18 and 102 are provided (FIG. 8 a) and then stacked in a frame 84 and placed on the disk body 16. The frame 84 is made of PTFE. In addition, a pressure plate 86 is placed on the above-arranged light guide layer 80, which is provided with the scratch-resistant coating 82, so that an intimate connection between the individual placed on the disk body 16 layers (Figure 8b). Subsequently, the frame, together with the layer structure comprising the disk body 16, the length expansion compensation layers 18 and 102, the liquid crystal array 22, the polarizer layer 20, the light guide layer 80 and the pressure plate 46, is placed in a vacuum bag 98 (FIG. 8c).
Der Vakuumbeutel 98 wird dann entlüftet und in einer Kammer einem erhöhten Druck P und einer erhöhten Temperatur T ausgesetzt, wodurch sich die Schichten des Schicht- aufbaus, das heißt der Scheibenkörper 16, die Längenausdehnungskompensations- schicht 18, die Flüssigkristallanordnung 22 mit der Polarisatorschicht 20, die Längen- ausdehnungskompensationsschicht 102 und die Lichtleiterschicht 80 miteinander verbinden (Figur 8d). Im Anschluss daran kann die verfügte Scheibenanordnung 100 dem Vakuumbeutel 98 entnommen und aus dem Rahmen 84 entformt werden (Figur 8e). In Figur 9 ist eine weitere alternative Ausfuhrungsform eine Scheibenanordnung darstellende Fahrzeugscheibe 1 10 zum Einsatz bei einem Deckelelement oder einem Festdachelement der in Figur 1 dargestellten Art gezeigt. Die Scheibenanordnung 110 umfasst ebenfalls einen Scheibenkörper 16, der ebenfalls eine dreidimensionale Wölbung aufweisen kann und an den innenseitig über eine Längenausdehnungskom- pensationsschicht 18, die adhäsive Eigenschaften aufweist, eine Flüssigkristallanordnung 22 angebunden ist, die entsprechend der Ausführungsform nach der Figuren 7 ausgebildet ist. Wiederum ist die Flüssigkristallanordnung 22 an ihrer dem Scheibenkörper 16 abgewandten Seite mit einer Polarisationsschicht 20 versehen. Über eine weitere Längenausdehnungskompensationsschicht 102 ist an die Flüssigkristallanordnung 22 mit der Polarisatorschicht 20 eine Lichtleiterschicht 80' angebunden, die als Scheibeninnenkörper aufgefasst werden kann und aus einem Klarglaspaneel besteht. Die Lichtleiterschicht 80' bildet die innere Sichtfläche der Scheibenanordnung 1 10. An der ihrer inneren Sichtfläche abgewandten Seite ist die Lichtleiterschicht 80' mit einem Druckmuster 1 12 versehen, das die Wirkung der Lichtleiterschicht 80' als Ambient-Light-Beleuchtungseinrichtung unterstützt. An ihrem umlaufenden Rand ist die Lichtleiterschicht 80' in Einbaulage mit zumindest einer Lichtquelle 81 verbunden, mittels der Licht in die Lichtleiterschicht 80' einkoppelbar ist. The vacuum bag 98 is then vented and exposed in a chamber to an elevated pressure P and an elevated temperature T, whereby the layers of the layer structure, ie the disk body 16, the length expansion compensation layer 18, the liquid crystal array 22 with the polarizer layer 20, the length expansion compensation layer 102 and the optical fiber layer 80 connect together (Figure 8d). Following this, the disposed disk arrangement 100 can be removed from the vacuum bag 98 and removed from the frame 84 (FIG. 8 e). FIG. 9 shows a further alternative embodiment of a pane arrangement 1 10 for use in a cover element or a fixed roof element of the type shown in FIG. The disk assembly 110 also comprises a disk body 16, which may also have a three-dimensional curvature and to the inside via a Längenausdehnungskom- compensation layer 18, which has adhesive properties, a liquid crystal array 22 is connected, which is formed according to the embodiment of Figure 7. Again, the liquid crystal array 22 is provided on its side facing away from the disk body 16 with a polarization layer 20. Via a further length expansion compensation layer 102, a light conductor layer 80 ', which can be regarded as a disk inner body and consists of a clear glass panel, is connected to the liquid crystal arrangement 22 with the polarizer layer 20. The light guide layer 80 'forms the inner visible surface of the disc assembly 1 10. On the side facing away from its inner visible surface, the light guide layer 80' is provided with a printing pattern 1 12, which supports the effect of the light guide layer 80 'as an ambient light illumination device. At its peripheral edge, the light guide layer 80 'is connected in the installed position with at least one light source 81, by means of the light in the light guide layer 80' can be coupled.
Auch bei der in Figur 9 dargestellten Ausfuhrungsform sind zwei Funktionalitäten integriert, nämlich einerseits eine Beschattungsfunktionalität in Form der schaltbaren Flüssigkristallanordnung 22 zusammen mit der Polarisatorschicht 20 und zum anderen eine Beleuchtungsfunktionalität in Form der Lichtleiterschicht 80', die mit der schaltbaren Lichtquelle 81 verbunden ist bzw. verbindbar ist. Wiederum sind beide Funktionalitäten unabhängig voneinander steuerbar. Die Herstellung der in Figur 9 dargestellten, einen Laminationsaufbau bildenden Scheibenanordnung 1 10 erfolgt im Wesentlichen analog zur anhand von Figur 8 dargestellten Herstellung der Scheibenanordnung nach Figur 7 und ist anhand Figur 10 dargestellt. Also, in the embodiment shown in Figure 9, two functionalities are integrated, namely on the one hand a shading functionality in the form of the switchable liquid crystal array 22 together with the polarizer layer 20 and on the other hand, a lighting functionality in the form of the light guide layer 80 ', which is connected to the switchable light source 81 and is connectable. Again, both functions are independently controllable. The production of the disk arrangement 1 10 forming a lamination structure shown in FIG. 9 takes place substantially analogously to the production of the disk arrangement according to FIG. 7, which is illustrated with reference to FIG. 8 and is illustrated with reference to FIG.
In einem ersten Schritt werden die Längenausdehnungskompensationsschicht 18, die Flüssigkristallanordnung 22 mit der Polarisationsschicht 20, die Längenausdehnungs- kompensationsschicht 102 sowie die aus einem Glaspaneel gebildete, vorgeschnittene Lichtleiterschicht 80' bereitgestellt (Figur 10a). Diese Schichten, die in verfügter Form einen Schichtaufbau mit dem Scheibenkörper 16 bilden sollen, werden dann in einen Rahmen 84 auf dem Scheibenkörper 16 in gestapelter Form angeordnet. Der Rahmen 84 hält die Relativlage der einzelnen genannten Schichten des Schichtaufbaus (Figur 10b). Dann wird der Scheibenkörper 16 zusammen mit dem Rahmen 84, der die genannten Schichten aufnimmt, in einen Vakuumbeutel eingeführt (Figur 10c), der anschließend entlüftet und mit einem erhöhten Druck und einer erhöhten Temperatur beaufschlagt wird. Dadurch werden die Lichtleiterschicht 80', die Flüssigkristallanordnung 22 mit der Polarisatorschicht 20 und der Scheibenkörper 16 in einem Prozessschritt miteinander verfügt (Figur lOd). Im Anschluss daran kann das fertige Produkt, das heißt die Scheibenanordnung 1 10 dem Vakuumbeutel 98 entnommen werden und nach Lösen von dem Rahmen 84 weiterbearbeitet bzw. zur Nutzung bei einem Schiebedach-Deckelelement, einem Festdachelement oder dergleichen bereitgestellt werden (Figur lOe). In a first step, the length expansion compensation layer 18, the liquid crystal array 22 with the polarization layer 20, the longitudinal expansion compensation layer 102 and the precut light guide layer 80 'formed from a glass panel (FIG. 10a). These layers, which are intended to form a layer structure with the disk body 16 in the arranged form, are then arranged in a frame 84 on the disk body 16 in a stacked form. The frame 84 holds the relative position of the individual layers of the layer structure (FIG. 10b). Then, the disk body 16 is inserted into a vacuum bag together with the frame 84 which receives said layers (Figure 10c), which is then vented and subjected to an elevated pressure and temperature. As a result, the optical waveguide layer 80 ', the liquid crystal array 22 with the polarizer layer 20 and the disk body 16 are arranged together in one process step (FIG. 10d). Subsequently, the finished product, that is, the disc assembly 1 10 can be removed from the vacuum bag 98 and after release from the frame 84 further processed or provided for use in a sliding roof cover element, a fixed roof element or the like (Figure 10e).
Bezugszeichenliste LIST OF REFERENCE NUMBERS
10 Fahrzeugdach 10 vehicle roof
12 Deckelelement  12 cover element
14 Festdachelement 14 fixed roof element
16, 16' Scheibenkörper  16, 16 'disk body
18 Längenausdehnungskompensationsschicht 18 length expansion compensation layer
20 Polarisatorschicht 20 polarizer layer
22 Flüssigkristallanordnung  22 liquid crystal device
24 Splitterschutzfolie 24 Splinter protection film
26 Randumschäumung  26 edge foam
28 Schicht  28 shift
30 Schicht  30 shift
32 Flüssigkristallzelle  32 liquid crystal cell
33 Abstandshalter 33 spacers
40 Fahrzeugscheibe  40 vehicle window
50 Fahrzeugscheibe  50 vehicle window
60 Fahrzeugscheibe  60 vehicle window
62 Längenausdehnungskompensationsschicht 64, 64' Schicht  62 length expansion compensation layer 64, 64 'layer
70 Fahrzeugscheibe  70 vehicle window
80, 80' Lichtleiterschicht  80, 80 'light guide layer
81 Lichtquelle  81 light source
82 ratzfestbeschichtung  82 scratch-proof coating
84 Rahmen 84 frame
86 Druckplatte  86 pressure plate
98 Vakuumbeutel  98 vacuum bags
100 Fahrzeugscheibe  100 vehicle window
102 Längenausdehnungskompensationsschicht 1 10 Fahrzeugscheibe  102 Linear Expansion Compensation Layer 1 10 Vehicle window
1 12 Druckmuster  1 12 print samples

Claims

Patentansprüche  claims
Fahrzeugscheibe, umfassend einen plattenartigen Scheibenkörper (16), der eine einer Fahrzeugumgebung zugewandte Außenseite und eine der Außenseite abgewandte Innenseite hat und an dessen Innenseite eine Beschattungsanordnung angeordnet ist, die aus einer Flüssigkristallanordnung (22) gebildet ist, die eine Flüssigkristallzelle (32) umfasst, wobei die Flüssigkristallanordnung (22) zwei Schichten (28, 30) aus biegsamem Dünnglas umfasst, zwischen denen die Flüssigkristallzelle (32) angeordnet ist, dadurch gekennzeichnet, dass zwischen den beiden Schichten (28, 30) aus Dünnglas Abstandshalter angeordnet sind, so dass die Flüssigkristallzelle (32) über ihre Erstreckung eine zumindest weitgehend konstante Dicke hat. A vehicle windshield comprising a plate-like disk body (16) having an outer side facing the vehicle environment and an inner side facing away from the outer side, and having disposed on the inside thereof a shading arrangement formed of a liquid crystal device (22) comprising a liquid crystal cell (32). the liquid crystal device (22) comprising two layers (28, 30) of flexible thin glass, between which the liquid crystal cell (32) is arranged, characterized in that spacers are arranged between the two layers (28, 30) of thin glass, so that the Liquid crystal cell (32) has an at least substantially constant thickness over its extent.
Fahrzeugscheibe nach Anspruch 1 , dadurch gekennzeichnet, dass die Schichten (28, 30) aus biegsamen Dünnglas jeweils eine Dicke von 0,1 mm bis 1,5 mm haben. Vehicle windscreen according to claim 1, characterized in that the layers (28, 30) of flexible thin glass each have a thickness of 0.1 mm to 1.5 mm.
Fahrzeugscheibe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Scheibenkörper (16) in Scheibenlängsrichtung und/oder in Scheibenquerrichtung gewölbt ist. Vehicle window according to claim 1 or 2, characterized in that the disk body (16) is curved in the disk longitudinal direction and / or in the disk transverse direction.
Fahrzeugscheibe nach einem der Ansprüche 1 bis 3, gekennzeichnet durch eine Polarisatorschicht (20). Vehicle window according to one of Claims 1 to 3, characterized by a polarizer layer (20).
Fahrzeugscheibe nach Anspruch 4, dadurch gekennzeichnet, dass die Polarisatorschicht (20) zwischen dem Scheibenkörper (16) und der Flüssigkristallanordnung (22) angeordnet ist. Vehicle window according to Claim 4, characterized in that the polarizer layer (20) is arranged between the pane body (16) and the liquid crystal arrangement (22).
6. Fahrzeugscheibe nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Polarisatorschicht (20) über eine Längensausdelinungskompensationsschicht (18) an den Scheibenkörper ( 16) und/oder an die Flüssigkristallanordnung (22) angebunden ist. 6. Vehicle windscreen according to claim 4 or 5, characterized in that the polarizer layer (20) via a Längensausdelinungskompensationsschicht (18) to the disk body (16) and / or to the liquid crystal assembly (22) is connected.
7. Fahrzeugscheibe nach Anspruch 6, dadurch gekennzeichnet, dass die Längenaus- dehnungskompensationsschicht ( 18) eine Acrylatschicht, eine Schicht aus thermoplastischen Polyurethan, eine Epoxidschicht, eine Silikonschicht oder eine Schicht aus einem vernetzenden Material, wie Ethylenvinylacetat (EVA) oder Polyvinyl- butyral (PVB), ist. 7. Vehicle windscreen according to claim 6, characterized in that the length expansion compensation layer (18) comprises an acrylate layer, a layer of thermoplastic polyurethane, an epoxy layer, a silicone layer or a layer of a crosslinking material, such as ethylene vinyl acetate (EVA) or polyvinyl butyral ( PVB), is.
8. Fahrzeugscheibe nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die 8. Vehicle window according to claim 6 or 7, characterized in that the
Längenausdehnungskompensationsschicht (18) eine Dicke von mindestens 0,2 mm, vorzugsweise von mindestens 0,4 mm hat.  Length expansion compensation layer (18) has a thickness of at least 0.2 mm, preferably at least 0.4 mm.
9. Fahrzeugscheibe nach einem der Ansprüche 1 bis 8, gekennzeichnet durch eine umlaufende Randumschäumung (26). 9. Vehicle window according to one of claims 1 to 8, characterized by a peripheral Randumschäumung (26).
10. Fahrzeugscheibe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass an der dem Scheibenkörper (16) abgewandten Seite der Fahrzeugscheibe eine Splitterschutzfolie (24) angeordnet ist. 10. Vehicle window according to one of claims 1 to 9, characterized in that on the disc body (16) facing away from the vehicle window a splinter protection film (24) is arranged.
1 1. Fahrzeugscheibe nach Anspruch 10 in Kombination mit Anspruch 9, dadurch 1 1. Vehicle window according to claim 10 in combination with claim 9, characterized
gekennzeichnet, dass die Randumschäumung (26) die Splitterschutzfolie (24) zumindest abschnittsweise übergreift.  characterized in that the Randumschäumung (26) overlaps the splinter protection film (24) at least in sections.
12. Fahrzeugscheibe nach einem der Ansprüche 1 bis 1 1 , gekennzeichnet durch eine Lichtleiterschicht (80, 80'), die über ihren Rand mit einer Lichtquelle verbindbar ist oder über ihren Rand mit einer Lichtquelle verbunden ist. 12. Vehicle window according to one of claims 1 to 1 1, characterized by a light guide layer (80, 80 '), which is connectable via its edge with a light source or is connected via its edge with a light source.
13. Falirzeugscheibe nach Anspruch 12, dadurch gekennzeichnet, dass die Lichtleiterschicht (80, 80') an der der Fahrzeugumgebung abgewandten Seite der Flüssigkristallanordnung (22) angeordnet ist. 13. Falirzeugscheibe according to claim 12, characterized in that the light guide layer (80, 80 ') on the vehicle environment facing away from the side of the liquid crystal array (22) is arranged.
14. Fahrzeugscheibe nach Anspruch 12 oder 13, dadurch gekennzeichnet, dass die Lichtleiterschicht (80, 80') eine innere Sichtfläche der Fahrzeugscheibe bildet. 14. Vehicle window according to claim 12 or 13, characterized in that the light guide layer (80, 80 ') forms an inner visible surface of the vehicle window.
15. Fahrzeugscheibe nach einem der Ansprüche 12 bis 14, dadurch gekennzeichnet, dass die Lichtleiterschicht (80') einen flächigen Glaskörper umfasst. 15. Vehicle window according to one of claims 12 to 14, characterized in that the light guide layer (80 ') comprises a flat glass body.
16. Fahrzeugscheibe nach einem der Ansprüche 12 bis 15, dadurch gekennzeichnet, dass die Lichtleiterschicht (80) eine Kunststofffolie und/oder eine Kunststoffplatte umfasst. 16. Vehicle window according to one of claims 12 to 15, characterized in that the light guide layer (80) comprises a plastic film and / or a plastic plate.
17. Fahrzeugscheibe nach einem der Ansprüche 12 bis 16, dadurch gekennzeichnet, dass die Lichtleiterschicht (80) Streuzentren enthält, die vorzugsweise von Nano- partikeln gebildet sind. 17. Vehicle window according to one of claims 12 to 16, characterized in that the light guide layer (80) contains scattering centers, which are preferably formed by nanoparticles.
18. Fahrzeugscheibe nach einem der Ansprüche 12 bis 17, dadurch gekennzeichnet, dass die Lichtleiterschicht (80') eine Bedruckung (52) aufweist. 18. Vehicle window according to one of claims 12 to 17, characterized in that the light guide layer (80 ') has a printing (52).
19. Fahrzeugscheibe nach einem der Ansprüche 12 bis 18, dadurch gekennzeichnet, dass die Lichtleiterschicht (80) eine Kratzfestbeschichtung (42) aufweist. 19. Vehicle window according to one of claims 12 to 18, characterized in that the light guide layer (80) has a scratch-resistant coating (42).
20. Verfahren zur Herstellung einer Fahrzeugscheibe, umfassend folgende Schritte: 20. A method for producing a vehicle window, comprising the following steps:
- Anordnung eines Aufbaus aus mehreren Schichten in gestapelter Form, wobei der Aufbau einen Scheibenkörper (16), eine Flüssigkristallanordnung (22), die eine Flüssigkristallzelle (32) und zwei Schichten (28, 30) aus Dünnglas umfasst, zwischen denen die Flüssigkristallzelle (32) angeordnet ist, und eine Längenausdeh- nungskompensationsschicht (18) zwischen der Flüssigkristallanordnung (22) und dem Scheibenkörper (16) umfasst, wobei zumindest die Flüssigkristallanordnung (22) und die Längenausdehnungskompensationsschicht (18) in einem Rahmen (84) angeordnet werden, der deren Relativlage zueinander definiert;  Arranging a multi-layered structure in a stacked form, said structure comprising a disk body (16), a liquid crystal device (22) comprising a liquid crystal cell (32) and two thin glass layers (28, 30) between which said liquid crystal cell (32 ) and a length expansion compensating layer (18) between the liquid crystal array (22) and the disk body (16), wherein at least the liquid crystal array (22) and the length expansion compensating layer (18) are disposed in a frame (84) Relative position defined to each other;
- Einbringen des Aufbaus mit dem Rahmen (84) in einen Vakuumbeutel (98); - Introducing the structure with the frame (84) in a vacuum bag (98);
- Entlüften des Vakuumbeutels (98) und Ausüben eines Drucks auf den Vakuumbeutel (98), so dass die Schichten des Aufbaus miteinander verbunden werden;Venting the vacuum bag (98) and applying a pressure to the vacuum bag (98) so that the layers of the structure are connected together;
- Entnehmen des verfügten Aufbaus aus dem Vakuumbeutel (98). - Remove the assembled assembly from the vacuum bag (98).
21. Verfahren nach Anspruch 20, dadurch gekennzeichnet, dass der Aufbau erwärmt wird, während er dem Druck ausgesetzt wird. 21. The method according to claim 20, characterized in that the structure is heated while it is exposed to the pressure.
22. Verfahren nach Anspruch 20 oder 21, dadurch gekennzeichnet, dass der Aufbau in dem Rahmen (84) mit einer Druckplatte (86) abgedeckt wird. 23. Verfahren nach einem der Ansprüche 20 bis 22, dadurch gekennzeichnet, dass der Aufbau eine Polarisatorschicht (20) umfasst. 22. The method according to claim 20 or 21, characterized in that the structure in the frame (84) with a pressure plate (86) is covered. 23. The method according to any one of claims 20 to 22, characterized in that the structure comprises a polarizer layer (20).
24. Verfahren nach einem der Ansprüche 20 bis 33, dadurch gekennzeichnet, dass der Aufbau eine Lichtleiterschicht (80, 80') umfasst. 24. The method according to any one of claims 20 to 33, characterized in that the structure comprises a light guide layer (80, 80 ').
PCT/EP2018/064086 2017-06-23 2018-05-29 Vehicle window having a liquid crystal arrangement WO2018233989A1 (en)

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