EP4081857A1 - Pare-soleil transparent pour véhicules - Google Patents

Pare-soleil transparent pour véhicules

Info

Publication number
EP4081857A1
EP4081857A1 EP20839070.8A EP20839070A EP4081857A1 EP 4081857 A1 EP4081857 A1 EP 4081857A1 EP 20839070 A EP20839070 A EP 20839070A EP 4081857 A1 EP4081857 A1 EP 4081857A1
Authority
EP
European Patent Office
Prior art keywords
liquid crystal
sun visor
visor according
light
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20839070.8A
Other languages
German (de)
English (en)
Inventor
Hamid-Reza NAJAF POUR AGHCHESHMEH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oviation BV
Original Assignee
Oviation BV
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 Oviation BV filed Critical Oviation BV
Publication of EP4081857A1 publication Critical patent/EP4081857A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
    • B60J3/04—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles adjustable in transparency
    • 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
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • G02F1/13347—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals working in reverse mode, i.e. clear in the off-state and scattering in the on-state
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13775—Polymer-stabilized liquid crystal layers
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1396—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
    • 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
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/66—Normally white display, i.e. the off state being white

Definitions

  • the invention relates to a transparent sun visor for vehicles with electrically switchable optical properties.
  • WIKIPEDIA key Intelligent Glass, accessed on June 28, 2019
  • intelligent glass English Smart that defines tintable glazing, the transparency of which is changed by the application of an electrical voltage (electrochromic), changed lighting conditions (photochromic) or heating (Thermochromism) changed.
  • electrical voltage electrochromic
  • photochromic changed lighting conditions
  • heating Thermochromism
  • intelligent glasses can, for example, serve as sun protection (glass remains transparent) or act as a privacy screen (glass becomes opaque).
  • DE 38 23780 A relates to sun protection, in particular to reduce the incidence of light into the interior of vehicles while maintaining visibility to the outside, which is designed as a flexible, multi-layer plastic film that has a transparent base layer and a transparent outer layer on at least one side.
  • a thin layer of largely opaque material which is interrupted in the form of a fine pattern, between a base layer and an outer layer.
  • WO 2014 / 086555A1 describes a glazing with electrically switchable optical properties, at least comprising: an outer pane and a switchable functional element, which is connected to the outer pane via at least one surface, a thermoplastic film, the thermoplastic film containing at least one luminescent material.
  • WO 2014 / 072138A1 relates to glazing with switchable optical properties, which comprises at least: a transparent substrate with an outer surface and an inner surface, a reflective layer on the outer surface and / or on the inner surface and a switchable functional element arranged on the inside opposite the reflective layer, wherein the reflective layer is a material with a refractive index H R of 1.6 to 2.5, and wherein the product of the refractive index H R and the thickness d of the reflective layer is 250 nm to 960 nm.
  • US 2014/0268289 A1 describes an electrochromic window with variable transmission, comprising: a first and a second essentially transparent substrate, to which electrically conductive materials are assigned; an electrochromic medium contained in a chamber disposed between the first and second substrates and containing at least one solvent, at least one anodic electroactive material, at least one cathodic electroactive material and at least one of the anodic and cathodic electroactive materials; and wherein the electrochromic window has an E Y of less than about 20 and more preferably less than about 5 while in a low transmittance state under normal daylight conditions.
  • US 2015/103280 A describes an intelligent electronic sun protection with an integrated glass plate and one on the glass plate attached liquid crystal film.
  • the liquid crystal film is formed with a plurality of display areas, and the liquid crystal film of the display area is cut into stripes or is mainly formed in a stripe shape with the display areas abutting each other.
  • a controller is installed between the display areas and a power source and connected to an input unit which is used to transmit signals and generate power control to the controller.
  • the controller controls the liquid crystal film of the display areas to be electrically connected or electrically separated to make the liquid crystal film transparent or opaque, respectively, to achieve an effect of simulating various states of partially shading light of a conventional window curtain.
  • DE 10 226406 A describes an information display device with a display unit that can be pulled down from the inside of the car roof, with a display surface that is parallel to the roof in its horizontal stowage position and that is perpendicular to it. It is in its working position at the back of the passenger seat.
  • the display area acts as sun protection for a transparent roof section or a transparent sliding roof section in a horizontal stowage position.
  • DE 10 2012 006 231 A1 relates to a layer arrangement which changes the transmission of light as a function of its temperature, the layer arrangement having a first polarization layer, a switching layer that influences the polarization properties of the light depending on the temperature, and a second polarization layer and an additional one Liche NIR transmission-preventing layer has.
  • US 2017 / 0235030A1 describes a light-reflecting film that can effectively improve the reflectivity of only a certain polarized light while maintaining a high permeability for visible light, as well as a film for controlling the light, an optical film, a functional glass and a head-up -Display.
  • a light reflective film comprises at least two light reflective light reflective layers, wherein at least two light reflection layers at least one of the light reflection layers between a light reflection layer PRL-1, a light reflection layer PRL-2 and a light reflection layer PRL-3, the light reflection layer PRL-1 having a central reflection wavelength of more than or equal to 400 nm, but less than 500 nm and a reflectivity for ordinary light at a central Reflexionswel len length of more than or equal to 5%, but less than or equal to 25%, wherein the light-reflecting layer PRL-2 has a central Reflexi onswellenfurfur of greater than or equal to 500 nm, but less than 600 nm and a reflectivity to ordinary light at the central reflection wavelength of greater than or equal to 5% but less than or equal to 25%, the light-reflecting layer PRL-3 having a central reflection wavelength of greater than or equal to 600 nm but less than 700 nm and a reflectivity to ordinary em has light at the central reflection, the wavelength is greater than or equal
  • US 2019 / 0331947A1 provides a laminate that can not only control the amount of external light transmitted, but can also be used as a mirror.
  • a first laminate comprises: a first liquid crystal element; a reflective polarizing element; and a second liquid crystal element.
  • the first liquid crystal element has first liquid crystal cells with changing states of orientation and a first polarization element of the absorption type.
  • the first liquid crystal cells can be switched between a mode in which one type of polarized light of the incident light is blocked and the other type of polarized light, and a mode in which one type of polarized light of the incident light is blocked , and the other kind of polarized system light is shifted and then transmitted; between a mode in which the incident light is transmitted unchanged and a mode in which one type of polarized light is blocked and the other type of polarized light is transmitted; and between a mode in which one type of polarized light of the incident light is blocked and the other type of polarized light is transmitted and a mode in which one type of polarized light of the incident light is transmitted and the other type of polarized light blocked.
  • the reflection type polarizing element receives the light transmitted from the first liquid crystal element, transmits one kind of polarized light of the incident light, and reflects the other kind of polarized light.
  • the second liquid crystal element has second liquid crystal cells with changing states of orientation and a second polarization element of the absorption type. When the polarizing element of the Reflexi on type has transmitted polarized light, the second liquid crystal cells can be switched between a mode in which the polarized light is blocked and a mode in which the polarized light is transmitted.
  • the object of the present invention is to provide a transparent sun visor which has an electrically switchable, i.e. dimmable, sun and thus glare protection.
  • Other essential features of the sun visor should be:
  • failsafe failsafe, "nomnally-white-mode", i.e. translucent (transparent) when de-energized
  • sun visor relates to vehicles, in particular aircraft, for example a pilot's cockpit, ships, trains and motor vehicles, in particular cars, trucks, mobile homes and buses.
  • a problem of the prior art is, for example, with standard sun visors of motor vehicles in the exchange and / or retrofitting of known electrochromic or electrotropic sun visors, for example if a visor in a motor vehicle fails or is damaged.
  • the known systems of the prior art are complex in terms of time and cost.
  • Commercially available sun visors in land and water vehicles are usually opaque and reduce the optical properties in use, possibly forming a blind spot.
  • a sun visor of a vehicle with electrically switchable optical properties which is characterized in that the sun visor in the de-energized state has maximum translucency (transparency) and minimal opacity for light in the visible range (380 nm to 780 nm) nm, in particular 400 nm to 750 nm) and in the state of applied voltage, in contrast, lower translucency (transparency) and / o which has higher opacity: away from sunglasses and the usual sun visor.
  • the sun visor according to the invention combines sun visor and sunglasses and does not interfere with driving vision. In contrast to conventional sun visor, the field of vision is retained.
  • the sun visor according to the invention is only effective in the area of disruptive and / or blinding solar radiation in order to save the driver from wearing, putting on and looking for the sunglasses.
  • the essential core of the invention thus preferably describes a "Failsafe Smartglass Window" (possibly still containing solar cells - battery-operated) and thus an exchange solution compared to the prior art without changes or maintenance and in the provision of a new functionality Invention compared to the prior art defined above lie in its flexibility:
  • Narrow edge for example less than 3 mm, possibly practically borderless
  • the sun visor according to the invention can be connected directly to the power supply of the vehicle or also with its own energy source (for example solar battery). Cumulatively or alternatively, the sun visor according to the invention can also be equipped with RFID and / or energy harvesting or solar cells for a serial new development. Its own solar power supply makes the sun visor self-sufficient from the vehicle's power supply and is particularly useful because the sun visor does not need to function if there is insufficient light exposure.
  • the aforementioned task is achieved by a sun visor of a vehicle with electrically switchable optical properties, which is characterized in that the sun visor in the de-energized state has maximum (optimal) translucency and minimal (optimal) opacity for light in the visible Be rich and in the state of applied voltage has a lower translucency and / or higher opacity for light in the visible range compared to the voltage-free state.
  • the sun visor comprises in a version 1 from the outside to the inside:
  • the intermediate layer (e) can optionally also be omitted.
  • the second intermediate layer (s) can also be designed in the form of a substrate; especially in the event that a PN-VA liquid crystal or a PD-TN liquid crystal element (d) is not available.
  • Example 1
  • ECB Electronically Controlled Birefringence
  • PN stands for "Polymer Network", i.e. a liquid crystal element bound to a polymer network.
  • PD stands for "Polymer Dispers", i.e. a polymeric liquid crystal element dispersed in a matrix.
  • PSCLC liquid crystals ie polymer-stabilized cholesteric liquid crystals can be used, which are obtainable by in situ photopolymerization of reactive liquid crystal molecules in the presence of non-reactive liquid crystal molecules in a planar oriented Bragg texture, whereby the UV- Networking is combined with a thermally induced pitch variation.
  • TN stands for "Twisted Nematic", i.e. a nematic rotating cell, the insides between two, mostly thin substrates being coated with a transparent electrode layer, for example an indium tin oxide layer, and the liquid crystal layer a few micrometers thick between them.
  • a transparent electrode layer for example an indium tin oxide layer
  • the liquid crystal layer a few micrometers thick between them.
  • the two substrates are coated with polarization filters rotated by 90 ° to each other.
  • VA stands for "Vertical Alignment”.
  • homeotropic liquid crystals ie liquid crystals oriented perpendicular to the substrate surface, are made parallel by the application of an electric field which is directed perpendicular to the substrate switched to the glass substrate.
  • liquid crystal mixtures with negative dielectric anisotropy are required, which are aligned perpendicular to the electric field. This is achieved by introducing lateral polar side groups into mesogenic molecules.
  • VA displays are therefore characterized by excellent contrast values and are usually operated in "normally black mode". This means that the screen is tinted when the power is off, for example black (dark).
  • OCA stands for "optical-clear-adhesive", i.e. an optically invisible adhesive.
  • the advantages of the present invention lie in the flexibility of the light transmission.
  • the combination of privacy (opaque) and sun protection (dark) is added in one, especially as a fail-safe solution.
  • Optical flexibility through variable multilayer combinations is also possible; see, for example, the transition from example 1 to example 2, which could possibly also have a total of 8 layers, for example.
  • a sun visor which is characterized in that the first and / or second liquid crystal element comprises a commercially available liquid crystal mixture between two panes (foils) coated with transparent conductive oxides.
  • the first and / or second liquid crystal element comprises a commercially available liquid crystal mixture between two panes (foils) coated with transparent conductive oxides.
  • Corresponding elements are available, for example, from Merck in Flandel.
  • a sun visor within the meaning of the present invention is particularly preferred if it is characterized in that the VA liquid crystal or the TN liquid crystal element, if present, are colorlessly transparent in the currentless state.
  • the advantage lies in the reliability. If the power fails, the occupants can still see through (VA and PN).
  • a sun visor as defined above, which is characterized in that the first and / or second liquid crystal element form a first and / or a second polarization layer that switches the translucency depending on the applied voltage.
  • the advantage here also lies in the reliability. Otherwise there would be no advantage in the presence of a PN and VA liquid crystal element. Both systems should preferably be fail-safe.
  • sun visors which are characterized in that the haze value (turbidity), determined with a Hazemeter NDH 2000 with standard illuminant D65 in the de-energized state in the range of visible light, is less than 1%, in particular less than 0.5%.
  • the transmission can also be achieved with a Hazemeter NDH 2000 with standard light type D65 of at least 50%, especially at least 60% be measured.
  • the layer structure according to the invention is therefore practically invisible to the naked eye under customary conditions.
  • the haze and transmission are measured, as is customary in the state of the art, with the overall sun visor using the D65 standard illuminant (see WIKIPEDIA, keyword "standard illuminant", retrieval date 06/28/2019).
  • the sun visor can comprise segmented switching areas of the cells for locally delimited light-dark and / or transparent-opaque control.
  • the power supply and control of the glazing or individual cells takes place in particular through external connections to the on-board network.
  • PCB flat, flexible control unit
  • a sun visor according to the invention can also have a separate or integrated screen / display device, since it is possible according to the invention to control active or passive matrices with which, for example, the speed, time, danger signs, warning signs (belt), etc. can be displayed.
  • active or passive matrices with which, for example, the speed, time, danger signs, warning signs (belt), etc. can be displayed.
  • (Small) OLED displays can also be embedded in the same way.
  • the sun visor comprises a flexible, optionally embedded solar cell-operated battery integrated into it, for example with a touch function in the operating unit. Operation is then carried out through a touch membrane.
  • touch elements are operated via the PCB (BUS system) or Control elements implemented as ON, OFF or switching commands in the function.
  • the user can operate the glazing directly on the sun visor, for example on the sun visor itself or a separate operating unit by touching the possibly masked touch areas.
  • Failsafe comprises a VA (Vertical Alignment), PNLC Polymer Network Liquid Crystal, as the first liquid crystal layer
  • A Cross-section structure of double cell 1. + 2: Only sun protection (only TN with TN or VA with VA:
  • 1st layer 2x 0.2 mm substrate: glass or plastic, especially polycarbonate
  • TN or VA cell total 1.1 mm
  • 2nd layer 2x 0.2 mm substrate: glass or plastic, especially polycarbonate
  • TN or VA cell total 1.1 mm
  • PNLC 0.4 mm PNLC, PN or PDLC PC or PSC (with privacy effect if necessary). Only PNLC can be combined with VA in order to achieve fail safe. Otherwise, PDLC or PSC must be combined with TN.
  • OCA optically clear adhesive
  • Example: TN cells can be connected using OCA or lamination using EVA.
  • PMMA or PC substrates result in low weight and high security.
  • the approval for road traffic or air traffic is unproblematic.
  • Input voltage 12-28 V DC-AC converter with 0.04 A - 0.09 A. Primarily 9-16 V maintains the permanent state.

Landscapes

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

Abstract

L'invention concerne un pare-soleil pour un véhicule à caractéristiques optiques électriquement commutables.
EP20839070.8A 2019-12-23 2020-12-22 Pare-soleil transparent pour véhicules Withdrawn EP4081857A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019135757.8A DE102019135757A1 (de) 2019-12-23 2019-12-23 Transparente Sonnenblende für Fahrzeuge
PCT/EP2020/087667 WO2021130246A1 (fr) 2019-12-23 2020-12-22 Pare-soleil transparent pour véhicules

Publications (1)

Publication Number Publication Date
EP4081857A1 true EP4081857A1 (fr) 2022-11-02

Family

ID=74175840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20839070.8A Withdrawn EP4081857A1 (fr) 2019-12-23 2020-12-22 Pare-soleil transparent pour véhicules

Country Status (6)

Country Link
US (1) US20230339297A1 (fr)
EP (1) EP4081857A1 (fr)
JP (1) JP2023512419A (fr)
CN (1) CN114930238A (fr)
DE (1) DE102019135757A1 (fr)
WO (1) WO2021130246A1 (fr)

Families Citing this family (2)

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