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WO2018084076A1 - Vitre de pare-brise, système d'affichage tête haute, et film demi-miroir - Google Patents

Vitre de pare-brise, système d'affichage tête haute, et film demi-miroir Download PDF

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Publication number
WO2018084076A1
WO2018084076A1 PCT/JP2017/038852 JP2017038852W WO2018084076A1 WO 2018084076 A1 WO2018084076 A1 WO 2018084076A1 JP 2017038852 W JP2017038852 W JP 2017038852W WO 2018084076 A1 WO2018084076 A1 WO 2018084076A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
liquid crystal
cholesteric liquid
light
windshield glass
Prior art date
Application number
PCT/JP2017/038852
Other languages
English (en)
Japanese (ja)
Inventor
昭裕 安西
峻也 加藤
Original Assignee
富士フイルム株式会社
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
Priority claimed from JP2017049013A external-priority patent/JP6768567B2/ja
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Priority to EP17867431.3A priority Critical patent/EP3537190A4/fr
Priority to CN201780065806.0A priority patent/CN109863430A/zh
Publication of WO2018084076A1 publication Critical patent/WO2018084076A1/fr
Priority to US16/383,207 priority patent/US20190235243A1/en

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    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/1044—Invariable transmission
    • B32B17/10458—Polarization selective transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—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
    • B32B17/10788—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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/3405—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of organic materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G02B2027/012—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility comprising devices for attenuating parasitic image effects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B2027/0192—Supplementary details
    • G02B2027/0194—Supplementary details with combiner of laminated type, for optical or mechanical aspects
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133543—Cholesteric polarisers
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • 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
    • G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector
    • G02F2201/343—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector cholesteric liquid crystal reflector

Definitions

  • the present invention relates to a windshield glass including a projected image display part.
  • the present invention also relates to a head-up display system using the windshield glass and a half mirror film that can be used for the windshield glass.
  • a projection image display member having a combiner function capable of simultaneously displaying a projected image and a landscape in front is used.
  • a projection image display part having such a function is provided on a windshield glass, a double image generated by reflection of projection light on the front or back surface of the glass tends to be prominent.
  • Patent Document 1 discloses using a curved vehicle windshield made of a laminated glass having a wedge-shaped cross section. Further, many techniques are known for eliminating double images by utilizing Brewster's angle so that p-polarized light is incident on the glass surface and bringing reflected light from the glass surface close to zero (for example, Patent Documents). 2).
  • Patent Document 3 discloses an example using a projection image display member including a ⁇ / 2 retardation layer in addition to a circularly polarized reflection layer including a cholesteric liquid crystal layer in a head-up display system using a Brewster angle. ing.
  • Patent Document 1 requires advanced techniques for adjusting the angle between the outer glass plate and the inner glass plate.
  • Patent Document 2 or 3 does not require such a technique.
  • the head-up display system described in Patent Document 3 can obtain higher light reflectance and light transmittance by using the technique described in Patent Document 2.
  • the present inventors have further studied the case where the projection image display member including the circularly polarized light reflection layer and the ⁇ / 2 retardation layer described in Patent Document 3 is used as the windshield glass.
  • the present invention has been made to solve the above problems, and can provide a head-up display system capable of displaying an image with reduced double images and high reflectivity and high transmittance.
  • An object of the present invention is to provide a windshield glass including a projected image display portion, wherein the projected image display portion is not conspicuous from the outside under external light.
  • the present inventor diligently studied the configuration in the case of using the configuration of the projection image display member including the circularly polarized reflection layer and the ⁇ / 2 retardation layer described in Patent Document 3 as the windshield glass.
  • the present inventors have found that the above-mentioned problems can be solved by including a cholesteric liquid crystal layer that exhibits selective reflection in a specific wavelength region.
  • a windshield glass including a projected image display part includes a circularly polarized light reflection layer and a ⁇ / 2 retardation layer,
  • the circularly polarized light reflection layer includes four or more cholesteric liquid crystal layers,
  • One of the four or more cholesteric liquid crystal layers is a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm, Windshield glass in which the central wavelengths of selective reflection of the cholesteric liquid crystal layers of four or more layers are different from each other.
  • the cholesteric liquid crystal layer closest to the ⁇ / 2 retardation layer is the cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm.
  • the circularly polarized light reflection layer has a cholesteric liquid crystal layer having a central wavelength of selective reflection at 490 nm to less than 600 nm, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 600 nm to less than 680 nm, and selective reflection at 680 nm to less than 850 nm.
  • [8] including a first glass plate, a second glass plate, and an intermediate layer between the first glass plate and the second glass plate, and at least a part of the intermediate layer includes the circularly polarized light reflecting layer and The ⁇ / 2 retardation layer is included, and the first glass plate, the circularly polarizing reflection layer, the ⁇ / 2 retardation layer, and the second glass plate are laminated in this order [1] to [7]
  • the windshield glass according to any one of [7].
  • the slow axis of the ⁇ / 2 retardation layer is in the range of + 40 ° to + 65 °, or ⁇ 40 ° to ⁇ 65 ° with respect to the vertical upward direction of the projected image display portion.
  • the spiral sense of all the cholesteric liquid crystal layers included in the circularly polarized light reflecting layer is on the right, and the slow axis of the ⁇ / 2 phase difference layer with respect to the vertical upward direction of the projected image display portion is
  • the spiral sense of all the cholesteric liquid crystal layers included in the circularly polarized light reflecting layer is on the left, and the slow axis of the ⁇ / 2 retardation layer is the vertical axis of the projected image display portion.
  • a half mirror film comprising a circularly polarized light reflecting layer and a ⁇ / 2 retardation layer, A cholesteric liquid crystal layer having a central wavelength of selective reflection from 350 nm to less than 490 nm, a cholesteric liquid crystal layer having a central wavelength of selective reflection from 490 nm to less than 600 nm from the ⁇ / 2 retardation layer side, 600 nm
  • a half mirror film comprising a cholesteric liquid crystal layer having a selective reflection center wavelength of 680 nm or less and a cholesteric liquid crystal layer having a selective reflection center wavelength of 680 nm or more and less than 850 nm in this order.
  • a windshield glass capable of displaying an image having a reduced double image and having a high reflectance and a high transmittance and in which the projected image display portion is not conspicuous from the outside under external light. it can.
  • “selective” for circularly polarized light means that the amount of light of either the right circularly polarized component or the left circularly polarized component of light is greater than that of the other circularly polarized component.
  • the degree of circular polarization of light is preferably 0.3 or more, more preferably 0.6 or more, and even more preferably 0.8 or more. More preferably, it is substantially 1.0. Table In / (I R + I L)
  • sense for circularly polarized light means right circularly polarized light or left circularly polarized light.
  • the sense of circularly polarized light is right-handed circularly polarized light when the electric field vector tip turns clockwise as time increases when viewed as the light travels toward you, and left when it turns counterclockwise. Defined as being circularly polarized.
  • the term “sense” is sometimes used for the twist direction of the spiral of the cholesteric liquid crystal.
  • the twist direction (sense) of the spiral of the cholesteric liquid crystal is right, it reflects right circularly polarized light and transmits left circularly polarized light.
  • the sense When the sense is left, it reflects left circularly polarized light and transmits right circularly polarized light.
  • light means visible light and natural light (unpolarized light) unless otherwise specified.
  • Visible light is light having a wavelength that can be seen by the human eye among electromagnetic waves, and usually indicates light having a wavelength range of 380 nm to 780 nm.
  • the measurement of the light intensity required in connection with the calculation of the light transmittance may be performed by using, for example, a normal visible spectrum meter and measuring the reference as air.
  • the term “reflected light” or “transmitted light” is used to mean scattered light and diffracted light.
  • the polarization state of each wavelength of light can be measured using a spectral radiance meter or a spectrometer equipped with a circularly polarizing plate.
  • the intensity of light measured through the right circularly polarizing plate corresponds to I R
  • the intensity of light measured through the left circularly polarizing plate corresponds to I L.
  • a circularly polarizing plate is attached to an illuminometer or an optical spectrum meter, it can be measured.
  • the ratio can be measured by attaching a right circular polarized light transmission plate, measuring the right circular polarized light amount, attaching a left circular polarized light transmission plate, and measuring the left circular polarized light amount.
  • p-polarized light means polarized light that vibrates in a direction parallel to the light incident surface.
  • the incident surface means a surface that is perpendicular to a reflecting surface (such as a windshield glass surface) and includes incident light rays and reflected light rays.
  • the vibration plane of the electric field vector is parallel to the incident plane.
  • s-polarized light means polarized light that vibrates in a direction perpendicular to the light incident surface.
  • the front phase difference is a value measured using an AxoScan manufactured by Axometrics. The measurement wavelength is 550 nm.
  • the front phase difference may be a value measured by making light having a wavelength in the visible light wavelength region incident in the normal direction of the film in KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments).
  • the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like.
  • the birefringence ( ⁇ n) of a liquid crystal compound is the same as that described in “Liquid Crystal / Fundamentals (Mitsoji Okano, Keisuke Kobayashi)” p. It is a value measured according to the method described in 214. Specifically, ⁇ n at 60 ° C. can be obtained by injecting a liquid crystal compound into a wedge-shaped cell, irradiating it with light having a wavelength of 550 nm, and measuring the refraction angle of transmitted light.
  • projection image means an image based on the projection of light from a projector to be used, not a surrounding landscape such as the front.
  • the projected image is observed as a virtual image that appears above the projected image display portion of the windshield glass as viewed from the observer.
  • screen image means an image displayed on a drawing device of a projector or an image drawn on an intermediate image screen or the like by the drawing device.
  • an image is a real image. Both the image and the projected image may be a single color image, a multicolor image of two or more colors, or a full color image.
  • the windshield glass means a window glass for vehicles such as cars, trains, airplanes, ships, play equipment and the like.
  • the windshield glass is preferably a windshield in the direction of travel of the vehicle.
  • the windshield glass is preferably a vehicle windshield.
  • the windshield glass may be planar. Further, the windshield glass may be formed for incorporation into an applied vehicle, and may have, for example, a curved surface. In a windshield glass formed for a vehicle to be applied, a direction that is upward (vertically upward) and a surface that is an observer side can be specified during normal use. In the present specification, when the windshield glass or the projected image display part is vertically above, it means the direction that is vertically above when it can be specified as described above.
  • the windshield glass may have a uniform thickness or a non-uniform thickness at the projected image display portion. For example, it may have a wedge-shaped cross section like the vehicle glass described in JP-T-2011-505330 and the projection image display part may have a non-uniform thickness. It is preferable that it is uniform.
  • the windshield glass of the present invention includes a projected image display portion.
  • the projected image display part is a part capable of displaying a projected image with reflected light, and may be any part capable of displaying the projected image projected from a projector or the like so as to be visible.
  • the projected image display part functions as a combiner of the head-up display system.
  • the combiner can display the image projected from the projector so as to be visible, and information on the opposite side when the combiner is observed from the same side where the image is displayed.
  • the projected image display part may be on the entire surface of the windshield glass, or may be part of the entire area of the windshield glass, but is preferably a part. In some cases, the projected image display part may be provided at any position on the windshield glass, but when used as a head-up display system, a virtual image is formed at a position that is easily visible from an observer (for example, a driver). It is preferably provided as shown. For example, the position where the projected image display part is provided may be determined from the relationship between the position of the driver's seat of the applied vehicle and the position where the projector is installed.
  • the projected image display part may be a flat surface having no curved surface, but may have a curved surface, and has a concave or convex shape as a whole, and enlarges or reduces the projected image. It may be displayed.
  • the windshield glass of the present invention includes a circularly polarized light reflection layer and a ⁇ / 2 phase difference layer in the projected image display portion.
  • the projected image display part may include layers such as a second retardation layer, an alignment layer, a support, and an adhesive layer described later in addition to the circularly polarized light reflection layer and the ⁇ / 2 retardation layer.
  • the projected image display part is configured so that the order is the ⁇ / 2 phase difference layer and the circularly polarized reflection layer from the viewer side (usually the vehicle inner side). It only has to be.
  • the observer side may be the projection video display side and the projection light incident side for the projection video display.
  • the projection image display part only needs to have a function as a half mirror for at least the projection light. However, for example, it does not need to function as a half mirror for light in the entire visible light range. Further, the projected image display part may have the function as the above-described half mirror with respect to light of all incident angles, but has the above function with respect to at least a part of incident light. It only has to be.
  • the projected image display part has visible light transparency so as to enable observation of information or landscape on the opposite surface side.
  • the projected image display region may have a light transmittance of 40% or more, preferably 50% or more, more preferably 60% or more, and further preferably 70% or more in the visible light wavelength region.
  • the light transmittance is the light transmittance determined by the method described in JIS-K7105.
  • the projected image display portion only needs to be formed of a half mirror film including a ⁇ / 2 phase difference layer and a circularly polarized light reflection layer.
  • the projected image display part can be formed by providing the half mirror film on the outer surface of the glass plate of the windshield glass or by providing it on the intermediate layer of the windshield glass having a laminated glass structure as described later.
  • the half mirror film may be provided on the viewer side as viewed from the glass plate or on the opposite side, but provided on the viewer side. It is preferable. More preferably, the half mirror film is provided in the intermediate layer. This is because a half mirror film having low scratch resistance compared to a glass plate is protected.
  • the circularly polarized light reflecting layer and the ⁇ / 2 retardation layer may be separately manufactured and bonded to each other to form a half mirror film.
  • the ⁇ / 2 retardation is formed on the circularly polarized light reflecting layer (cholesteric liquid crystal layer).
  • a half-mirror film may be formed by forming a circularly polarized light reflecting layer (cholesteric liquid crystal layer) on the ⁇ / 2 retardation layer by forming a layer.
  • the half mirror film may be a film shape, a sheet shape, a plate shape, or the like.
  • the half mirror film may be a roll or the like as a thin film.
  • the half mirror film may include layers such as a second retardation layer, an alignment layer, a support, and an adhesive layer described later in addition to the circularly polarized light reflection layer and the ⁇ / 2 retardation layer.
  • the circularly polarized light reflection layer is a layer that reflects light for displaying a projected image, and indicates a layer included as a layer that can be distinguished from the retardation layer in the projected image display portion of the present invention.
  • the circularly polarized light reflection layer includes four or more cholesteric liquid crystal layers.
  • the circularly polarized light reflection layer may include other layers such as a support and an alignment layer.
  • a cholesteric liquid crystal layer means a layer in which a cholesteric liquid crystal phase is fixed.
  • the cholesteric liquid crystal layer is sometimes simply referred to as a liquid crystal layer.
  • the cholesteric liquid crystal layer may be a layer in which the orientation of the liquid crystal compound in the cholesteric liquid crystal phase is maintained.
  • the polymerizable liquid crystal compound is placed in the orientation state of the cholesteric liquid crystal phase and then irradiated with ultraviolet rays.
  • any layer may be used as long as it is polymerized and cured by heating or the like to form a layer having no fluidity, and at the same time, the layer is changed to a state in which the orientation is not changed by an external field or an external force.
  • the cholesteric liquid crystal layer it is sufficient that the optical properties of the cholesteric liquid crystal phase are maintained in the layer, and the liquid crystal compound in the layer does not have to exhibit liquid crystallinity.
  • the polymerizable liquid crystal compound may have a high molecular weight due to a curing reaction and may no longer have liquid crystallinity.
  • the cholesteric liquid crystal phase exhibits circularly polarized light selective reflection that selectively reflects the circularly polarized light of either the right circularly polarized light or the left circularly polarized light and transmits the circularly polarized light of the other sense.
  • the circularly polarized light selective reflection is sometimes simply referred to as selective reflection.
  • Many films formed from a composition containing a polymerizable liquid crystal compound have been known as a film containing a layer in which a cholesteric liquid crystal phase exhibiting circularly polarized light selectively is fixed. You can refer to the technology.
  • the central wavelength ⁇ of selective reflection of the cholesteric liquid crystal layer means a wavelength at the center of gravity of the reflection peak of the circularly polarized reflection spectrum measured from the normal direction of the cholesteric liquid crystal layer.
  • the selective reflection center wavelength and the half-value width of the cholesteric liquid crystal layer can be obtained as follows.
  • a reduction peak in transmittance is observed in the selective reflection band.
  • the wavelength value on the short wavelength side is ⁇ l (nm)
  • the wavelength value on the long wavelength side Is ⁇ h (nm)
  • the center wavelength ⁇ and the half-value width ⁇ of selective reflection can be expressed by the following equations.
  • the selective reflection center wavelength obtained as described above substantially matches the wavelength at the center of gravity of the reflection peak of the circularly polarized reflection spectrum measured from the normal direction of the cholesteric liquid crystal layer.
  • the center wavelength of selective reflection can be adjusted by adjusting the pitch of the helical structure.
  • the cholesteric liquid crystal layer exhibiting selective reflection in the visible light region preferably has a center wavelength of selective reflection in the visible light region.
  • the center wavelength ⁇ is adjusted to selectively reflect either the right circularly polarized light or the left circularly polarized light with respect to red light, green light, and blue light. be able to.
  • the head-up display system it is preferable that the head-up display system is used so that light is incident obliquely with respect to the circularly polarized reflective layer so that the reflectance on the glass surface on the projection light incident side is low.
  • ⁇ d n 2 ⁇ P ⁇ cos ⁇ 2
  • n ⁇ P may be adjusted by inserting this angle and the center wavelength of the desired selective reflection into the above equation.
  • the pitch of the cholesteric liquid crystal phase depends on the type of chiral agent used together with the polymerizable liquid crystal compound or the concentration of the chiral agent, the desired pitch can be obtained by adjusting these.
  • the method of measuring spiral sense and pitch use the methods described in “Introduction to Liquid Crystal Chemistry Experiments”, edited by the Japanese Liquid Crystal Society, Sigma Publishing 2007, page 46, and “Liquid Crystal Handbook”, Liquid Crystal Handbook Editing Committee, page 196. be able to.
  • the circularly polarized light reflection layer includes four or more cholesteric liquid crystal layers, and the central wavelengths of selective reflection of the four or more cholesteric liquid crystal layers are different from each other.
  • the circularly polarized light reflection layer preferably has an apparent selective reflection center wavelength with respect to red light, green light, and blue light.
  • the apparent center wavelength of selective reflection means the wavelength at the center of gravity of the reflection peak of the circularly polarized reflection spectrum of the cholesteric liquid crystal layer measured from the observation direction in practical use.
  • the circularly polarized light reflection layer may include a cholesteric liquid crystal layer that selectively reflects red light, a cholesteric liquid crystal layer that selectively reflects green light, and a cholesteric liquid crystal layer that selectively reflects blue light.
  • the circularly polarized light reflection layer includes, for example, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 490 nm to less than 600 nm, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 600 nm to less than 680 nm, and a center of selective reflection at 680 nm to less than 850 nm. It is preferable to include a cholesteric liquid crystal layer having a wavelength.
  • Displaying a clear projected image with high light utilization efficiency by adjusting the center wavelength of selective reflection of the cholesteric liquid crystal layer to be used according to the emission wavelength range of the light source used for projection and the usage of the circularly polarized reflective layer Can do.
  • a clear color projection image can be displayed with high light utilization efficiency.
  • usage of the circularly polarized light reflecting layer include the incident angle of the projected light on the circularly polarized light reflecting layer, the direction in which the projected image is observed, and the like.
  • the circularly polarizing reflection layer includes a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm as one of four or more cholesteric liquid crystal layers.
  • the present inventors have observed the projected image display portion in the windshield glass under the external light. It was discovered that the color (especially yellow) was confirmed.
  • the above-mentioned color is felt in the projected image display part even when the windshield glass is observed under the external light.
  • the projection image display part can be made inconspicuous from the outside.
  • the optical design is made on the assumption that light is incident obliquely with respect to the circularly polarized reflective layer in order to reduce the double image using the Brewster angle.
  • a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm it is felt even through polarized sunglasses when observing external light through a projected image display part. It is also possible to reduce the glare produced.
  • s-polarized light based on reflected light from the ground or water surface that is not visually recognized through polarized sunglasses can be converted into a light component that is visually recognized by changing the polarization state at the projected image display site, and this light component is 350 nm. It is considered that the decrease is caused by using a cholesteric liquid crystal layer having a central wavelength of selective reflection below 490 nm.
  • a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm (hereinafter sometimes referred to as a “short wavelength cholesteric liquid crystal layer”) preferably has a central wavelength of selective reflection at 370 nm to 485 nm. It is more preferable to have a central wavelength of selective reflection at 480 nm, and it is more preferable to have a central wavelength of selective reflection from 400 nm to 470 nm.
  • the short wavelength cholesteric liquid crystal layer may have an apparent selective reflection center wavelength of 280 nm or more and less than 420 nm, preferably 300 nm or more and less than 410 nm, preferably 320 nm or more and less than 400 nm when used in a head-up display system. Is more preferably 340 nm or more and less than 395 nm.
  • the short wavelength cholesteric liquid crystal layer is closest to the ⁇ / 2 retardation layer among the four or more cholesteric liquid crystal layers. This is because the double image is further reduced.
  • the cholesteric liquid crystal layer is preferably arranged in order from the one having the shortest central wavelength of selective reflection as viewed from the ⁇ / 2 retardation layer side.
  • a ⁇ / 2 retardation layer, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 to 490 nm, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 490 to 600 nm, and a center of selective reflection at 600 to 680 nm It is preferable that a cholesteric liquid crystal layer having a wavelength and a cholesteric liquid crystal layer having a central wavelength of selective reflection at 680 nm or more and less than 850 nm are arranged in this order.
  • each cholesteric liquid crystal layer a cholesteric liquid crystal layer whose spiral sense is either right or left is used.
  • the sense of reflected circularly polarized light in the cholesteric liquid crystal layer coincides with the sense of a spiral.
  • the spiral senses of the cholesteric liquid crystal layers having different selective reflection center wavelengths may all be the same or may include different ones, but are preferably the same.
  • a plurality of cholesteric liquid crystal layers having the same pitch P and the same spiral sense may be stacked. By laminating cholesteric liquid crystal layers having the same pitch P and the same spiral sense, the circularly polarized light selectivity can be increased at a specific wavelength.
  • the half width ⁇ of selective reflection may be 15 nm to 200 nm, 15 nm to 150 nm, 20 nm to 100 nm, or the like.
  • the circularly polarized light reflection layer preferably includes at least one cholesteric liquid crystal layer having a selective reflection half width ⁇ of 50 nm or less.
  • a cholesteric liquid crystal layer having a selective reflection half-value width ⁇ of 50 nm or less may be referred to as a narrow-band selective reflection layer.
  • the circularly polarized light reflecting layer includes two narrow band selective reflecting layers.
  • the cholesteric liquid crystal layer having the apparent center wavelength of selective reflection for green light and blue light is preferably a narrow-band selective reflection layer.
  • the cholesteric liquid crystal layer having the apparent center wavelength of selective reflection with respect to green light and blue light is a narrow-band selective reflection layer, a projection image that provides a clear projection image without impairing the transparency of the windshield glass. It is possible to form an image display part.
  • a separately prepared cholesteric liquid crystal layer may be laminated using an adhesive or the like, and is directly polymerizable on the surface of the previous cholesteric liquid crystal layer formed by the method described later.
  • a liquid crystal composition containing a liquid crystal compound or the like may be applied and the steps of alignment and fixing may be repeated, but the latter is preferred.
  • the orientation direction of the liquid crystal molecules on the air interface side of the previously formed cholesteric liquid crystal layer and the cholesteric liquid crystal layer formed thereon This is because the orientation directions of the lower liquid crystal molecules coincide with each other, and the polarization property of the laminate of cholesteric liquid crystal layers is improved. Moreover, interference unevenness that may be caused by unevenness in the thickness of the adhesive layer is not observed.
  • cholesteric liquid crystal layer a manufacturing material and a manufacturing method of the cholesteric liquid crystal layer
  • the material used for forming the cholesteric liquid crystal layer include a liquid crystal composition containing a polymerizable liquid crystal compound and a chiral agent (optically active compound). If necessary, apply the above liquid crystal composition mixed with a surfactant or a polymerization initiator and dissolved in a solvent to the support, alignment layer, cholesteric liquid crystal layer as a lower layer, etc.
  • a cholesteric liquid crystal layer can be formed by being fixed by curing the liquid crystal composition.
  • the polymerizable liquid crystal compound may be a rod-like liquid crystal compound or a disk-like liquid crystal compound, but is preferably a rod-like liquid crystal compound.
  • Examples of the rod-like polymerizable liquid crystal compound forming the cholesteric liquid crystal layer include a rod-like nematic liquid crystal compound.
  • rod-like nematic liquid crystal compounds examples include azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines.
  • Phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used. Not only low-molecular liquid crystal compounds but also high-molecular liquid crystal compounds can be used.
  • the polymerizable liquid crystal compound can be obtained by introducing a polymerizable group into the liquid crystal compound.
  • the polymerizable group include an unsaturated polymerizable group, an epoxy group, and an aziridinyl group, preferably an unsaturated polymerizable group, and particularly preferably an ethylenically unsaturated polymerizable group.
  • the polymerizable group can be introduced into the molecule of the liquid crystal compound by various methods.
  • the number of polymerizable groups possessed by the polymerizable liquid crystal compound is preferably 1 to 6, more preferably 1 to 3 per molecule. Examples of polymerizable liquid crystal compounds are described in Makromol. Chem. 190, 2255 (1989), Advanced Materials, 5, 107 (1993), US Pat. No.
  • the addition amount of the polymerizable liquid crystal compound in the liquid crystal composition is preferably 80 to 99.9% by mass with respect to the solid content mass (mass excluding the solvent) of the liquid crystal composition, and is preferably 85 to 99. It is more preferably 5% by mass, particularly preferably 90 to 99% by mass.
  • a narrow band is obtained by forming a cholesteric liquid crystal phase using a low ⁇ n polymerizable liquid crystal compound and fixing it to a film.
  • a selective reflection layer can be obtained.
  • the low ⁇ n polymerizable liquid crystal compound include compounds described in International Publications WO2015 / 115390, WO2015 / 147243, WO2016 / 035873, JP2015-163596, and JP2016-53149A.
  • the description of WO2016 / 047648 can also be referred to for the liquid crystal composition providing a selective reflection layer having a small half width.
  • the liquid crystal compound is also preferably a polymerizable compound represented by the following formula (I) described in WO2016 / 047648.
  • A represents a phenylene group which may have a substituent or a trans-1,4-cyclohexylene group which may have a substituent
  • L is a single bond, —CH 2 O—, —OCH 2 —, — (CH 2 ) 2 OC ( ⁇ O) —, —C ( ⁇ O) O (CH 2 ) 2 —, —C ( ⁇ O) O Selected from the group consisting of —, —OC ( ⁇ O) —, —OC ( ⁇ O) O—, —CH ⁇ CH—C ( ⁇ O) O—, and —OC ( ⁇ O) —CH ⁇ CH—.
  • a linking group m represents an integer of 3 to 12
  • Sp 1 and Sp 2 are each independently one or more of a single bond, a linear or branched alkylene group having 1 to 20 carbon atoms, and a linear or branched alkylene group having 1 to 20 carbon atoms.
  • CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or —C ( ⁇ O) O—.
  • * represents a bonding position.
  • the phenylene group is preferably a 1,4-phenylene group.
  • the phenylene group and trans-1,4-cyclohexylene group may have 1 to 4 substituents. When it has two or more substituents, the two or more substituents may be the same or different from each other.
  • the alkyl group may be linear or branched.
  • the alkyl group preferably has 1 to 30 carbon atoms, more preferably 1 to 10 carbon atoms, and particularly preferably 1 to 6 carbon atoms.
  • Examples of the alkyl group include, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group.
  • alkyl group a 1,1-dimethylpropyl group, n-hexyl group, isohexyl group, linear or branched heptyl group, octyl group, nonyl group, decyl group, undecyl group, or dodecyl group.
  • alkyl group is the same for the alkoxy group containing an alkyl group.
  • specific examples of the alkylene group referred to as an alkylene group include a divalent group obtained by removing one arbitrary hydrogen atom in each of the above examples of the alkyl group.
  • the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
  • the cycloalkyl group preferably has 3 to 20 carbon atoms, more preferably 5 or more, more preferably 10 or less, still more preferably 8 or less, and still more preferably 6 or less.
  • Examples of the cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
  • the substituents that the phenylene group and the trans-1,4-cyclohexylene group may have are particularly an alkyl group, an alkoxy group, and a group consisting of —C ( ⁇ O) —X 3 —Sp 3 —Q 3 Substituents selected from are preferred.
  • X 3 represents a single bond, —O—, —S—, or —N (Sp 4 -Q 4 ) —, or represents a nitrogen atom that forms a ring structure with Q 3 and Sp 3. Show.
  • Sp 3 and Sp 4 are each independently one or more of a single bond, a linear or branched alkylene group having 1 to 20 carbon atoms, and a linear or branched alkylene group having 1 to 20 carbon atoms.
  • CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or —C ( ⁇ O) O—.
  • a linking group selected from the group consisting of substituted groups is shown.
  • Q 3 and Q 4 are each independently a hydrogen atom, a cycloalkyl group, or a cycloalkyl group, wherein one or more —CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or a group substituted with —C ( ⁇ O) O—, or a group represented by Formulas Q-1 to Q-5 Any polymerizable group selected from the group consisting of:
  • —CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O).
  • group substituted with — or —C ( ⁇ O) O— include a tetrahydrofuranyl group, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidinyl group, a piperidyl group, a piperazinyl group, and a morpholinyl group.
  • the substitution position is not particularly limited. Of these, tetrahydrofuranyl group is preferable, and 2-tetrahydrofuranyl group is particularly preferable.
  • L represents a single bond, —CH 2 O—, —OCH 2 —, — (CH 2 ) 2 OC ( ⁇ O) —, —C ( ⁇ O) O (CH 2 ) 2 —, — C ( ⁇ O) O—, —OC ( ⁇ O) —, —OC ( ⁇ O) O—, —CH ⁇ CH—C ( ⁇ O) O—, —OC ( ⁇ O) —CH ⁇ CH—,
  • a linking group selected from the group consisting of: L is preferably —C ( ⁇ O) O— or —OC ( ⁇ O) —.
  • m-1 Ls may be the same as or different from each other.
  • Sp 1 and Sp 2 are each independently one or more of a single bond, a linear or branched alkylene group having 1 to 20 carbon atoms, and a linear or branched alkylene group having 1 to 20 carbon atoms.
  • CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or —C ( ⁇ O) O—.
  • a linking group selected from the group consisting of substituted groups is shown.
  • Sp 1 and Sp 2 each independently has 1 carbon atom to which a linking group selected from the group consisting of —O—, —OC ( ⁇ O) —, and —C ( ⁇ O) O— is bonded to both ends.
  • Q 1 and Q 2 each independently represent a hydrogen atom or a polymerizable group selected from the group consisting of groups represented by the above formulas Q-1 to Q-5, provided that Q 1 and Q 2 Either one represents a polymerizable group.
  • a polymerizable group an acryloyl group (formula Q-1) or a methacryloyl group (formula Q-2) is preferable.
  • m represents an integer of 3 to 12, preferably an integer of 3 to 9, more preferably an integer of 3 to 7, and further preferably an integer of 3 to 5.
  • the polymerizable compound represented by the formula (I) has at least one phenylene group which may have a substituent as A and a trans-1,4-cyclohexylene group which may have a substituent. It is preferable to include at least one.
  • the polymerizable compound represented by the formula (I) preferably contains 1 to 4 trans-1,4-cyclohexylene groups which may have a substituent as A, and preferably 1 to 3 Is more preferable, and it is more preferable that 2 or 3 is included.
  • A preferably contains at least one phenylene group which may have a substituent, more preferably 1 to 4, more preferably 1 to 1. It is more preferable to include three, and it is particularly preferable to include two or three.
  • polymerizable compound represented by the formula (I) include, in addition to the compounds described in paragraphs 0051 to 0058 of WO2016 / 047648, JP2013-112163A, JP2010-70543A, Examples thereof include compounds described in Japanese Patent No. 4725516, International Publication Nos. WO2015 / 115390, WO2015 / 147243, WO2016 / 035873, JP2015-163596A, and JP2016-53149A.
  • the chiral agent has a function of inducing a helical structure of a cholesteric liquid crystal phase.
  • the chiral compound may be selected according to the purpose because the helical sense or helical pitch induced by the compound is different.
  • limiting in particular as a chiral agent A well-known compound can be used.
  • Examples of chiral agents include liquid crystal device handbook (Chapter 3, Section 4-3, TN, chiral agent for STN, 199 pages, edited by Japan Society for the Promotion of Science, 142th Committee, 1989), JP-A 2003-287623, Examples thereof include compounds described in JP-A No. 2002-302487, JP-A No. 2002-80478, JP-A No. 2002-80851, JP-A No. 2010-181852 or JP-A No. 2014-034581.
  • a chiral agent generally contains an asymmetric carbon atom, but an axially asymmetric compound or a planar asymmetric compound containing no asymmetric carbon atom can also be used as the chiral agent.
  • the axial asymmetric compound or the planar asymmetric compound include binaphthyl, helicene, paracyclophane, and derivatives thereof.
  • the chiral agent may have a polymerizable group. When both the chiral agent and the liquid crystal compound have a polymerizable group, they are derived from the repeating unit derived from the polymerizable liquid crystal compound and the chiral agent by a polymerization reaction between the polymerizable chiral agent and the polymerizable liquid crystal compound.
  • the polymerizable group possessed by the polymerizable chiral agent is preferably the same group as the polymerizable group possessed by the polymerizable liquid crystal compound. Therefore, the polymerizable group of the chiral agent is also preferably an unsaturated polymerizable group, an epoxy group or an aziridinyl group, more preferably an unsaturated polymerizable group, and an ethylenically unsaturated polymerizable group. Particularly preferred.
  • the chiral agent may be a liquid crystal compound.
  • an isosorbide derivative As the chiral agent, an isosorbide derivative, an isomannide derivative, or a binaphthyl derivative can be preferably used.
  • an isosorbide derivative a commercial product such as LC-756 manufactured by BASF may be used.
  • the content of the chiral agent in the liquid crystal composition is preferably 0.01 mol% to 200 mol%, more preferably 1 mol% to 30 mol%, based on the amount of the polymerizable liquid crystal compound.
  • the liquid crystal composition preferably contains a polymerization initiator.
  • the polymerization initiator to be used is preferably a photopolymerization initiator that can start the polymerization reaction by ultraviolet irradiation.
  • photopolymerization initiators include ⁇ -carbonyl compounds (described in US Pat. No. 2,367,661 and US Pat. No. 2,367,670), acyloin ethers (described in US Pat. No. 2,448,828), ⁇ -hydrocarbons.
  • a substituted aromatic acyloin compound (described in US Pat. No.
  • acyl phosphine oxide compound As the polymerization initiator, it is also preferable to use an acyl phosphine oxide compound or an oxime compound.
  • acylphosphine oxide compound for example, IRGACURE 810 (compound name: bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide) manufactured by BASF Japan Ltd. can be used.
  • oxime compounds examples include IRGACURE OXE01 (manufactured by BASF), IRGACURE OXE02 (manufactured by BASF), TR-PBG-304 (manufactured by Changzhou Strong Electronic New Materials Co., Ltd.), Adeka Arcles NCI-831, Adeka Arcles NCI-930 Commercial products such as (ADEKA) and Adeka Arcles NCI-831 (ADEKA) can be used. Only one type of polymerization initiator may be used, or two or more types may be used in combination.
  • the content of the photopolymerization initiator in the liquid crystal composition is preferably 0.1% by mass to 20% by mass, and preferably 0.5% by mass to 5% by mass with respect to the content of the polymerizable liquid crystal compound. More preferably.
  • the liquid crystal composition may optionally contain a crosslinking agent in order to improve the film strength after curing and improve the durability.
  • a crosslinking agent one that can be cured by ultraviolet rays, heat, moisture, or the like can be suitably used.
  • polyfunctional acrylate compounds such as a trimethylol propane tri (meth) acrylate and pentaerythritol tri (meth) acrylate
  • Glycidyl (meth) acrylate Epoxy compounds such as ethylene glycol diglycidyl ether; aziridine compounds such as 2,2-bishydroxymethylbutanol-tris [3- (1-aziridinyl) propionate], 4,4-bis (ethyleneiminocarbonylamino) diphenylmethane; hexa Isocyanate compounds such as methylene diisocyanate and biuret type isocyanate; polyoxazoline compounds having an oxazoline group in the side chain; vinyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropylto Alkoxysilane compounds such as methoxy silane.
  • a well-known catalyst can be used according to the reactivity of a crosslinking agent, and productivity can be improved in addition to membrane strength and durability improvement. These may be used individually by 1 type and may use 2 or more types together.
  • the content of the crosslinking agent is preferably 3% by mass to 20% by mass, and more preferably 5% by mass to 15% by mass. By making the content of the crosslinking agent 3% by mass or more, the effect of improving the crosslinking density can be obtained, and by making the content of the crosslinking agent 20% by mass or less, the stability of the cholesteric liquid crystal layer is lowered. Can be prevented.
  • an alignment control agent that contributes to stably or rapidly forming a cholesteric liquid crystal layer having a planar alignment may be added.
  • the alignment control agent include fluorine (meth) acrylate polymers described in paragraphs [0018] to [0043] of JP-A-2007-272185, and paragraphs [0031] to [0034] of JP-A-2012-203237. And compounds represented by the formulas (I) to (IV) as described above.
  • 1 type may be used independently and 2 or more types may be used together.
  • the addition amount of the alignment control agent in the liquid crystal composition is preferably 0.01% by mass to 10% by mass, more preferably 0.01% by mass to 5% by mass with respect to the total mass of the polymerizable liquid crystal compound. 0.02% by mass to 1% by mass is particularly preferable.
  • the liquid crystal composition may contain at least one selected from a surfactant for adjusting the surface tension of the coating film to make the thickness uniform, and various additives such as a polymerizable monomer.
  • a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a colorant, metal oxide fine particles, etc. are added to the liquid crystal composition as necessary, as long as optical performance is not deteriorated. can do.
  • a cholesteric liquid crystal layer is prepared by preparing a liquid crystal composition in which a polymerizable liquid crystal compound and a polymerization initiator, a chiral agent added as necessary, a surfactant, and the like are dissolved in a solvent, a support, an alignment layer, or first.
  • a cholesteric liquid crystal layer in which the cholesteric regularity is fixed by coating the cholesteric liquid crystal layer on the coated cholesteric liquid crystal layer and drying it to obtain a coating film, and irradiating the coating film with an actinic ray to polymerize the cholesteric liquid crystalline composition Can be formed.
  • the laminated film which consists of a some cholesteric liquid crystal layer can be formed by repeating the said manufacturing process of a cholesteric liquid crystal layer.
  • solvent there is no restriction
  • the organic solvent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, ketones, alkyl halides, amides, sulfoxides, heterocyclic compounds, hydrocarbons, esters, ethers, etc. Is mentioned. These may be used individually by 1 type and may use 2 or more types together. Among these, ketones are particularly preferable in consideration of environmental load.
  • the method for applying the liquid crystal composition to the support, the alignment layer, the underlying cholesteric liquid crystal layer, etc. is not particularly limited and can be appropriately selected according to the purpose.
  • a wire bar coating method, a curtain coating method examples include extrusion coating, direct gravure coating, reverse gravure coating, die coating, spin coating, dip coating, spray coating, and slide coating. It can also be carried out by transferring a liquid crystal composition separately coated on a support.
  • the liquid crystal molecules are aligned by heating the applied liquid crystal composition.
  • the heating temperature is preferably 200 ° C. or lower, and more preferably 130 ° C. or lower.
  • the liquid crystal composition can be cured by further polymerizing the aligned liquid crystal compound.
  • the polymerization may be either thermal polymerization or photopolymerization utilizing light irradiation, but photopolymerization is preferred. It is preferable to use ultraviolet rays for light irradiation.
  • the irradiation energy is preferably 20mJ / cm 2 ⁇ 50J / cm 2, 100mJ / cm 2 ⁇ 1,500mJ / cm 2 is more preferable.
  • light irradiation may be performed under heating conditions or in a nitrogen atmosphere.
  • the irradiation ultraviolet wavelength is preferably 350 nm to 430 nm.
  • the polymerization reaction rate is preferably as high as possible from the viewpoint of stability, preferably 70% or more, and more preferably 80% or more.
  • the polymerization reaction rate can be determined by measuring the consumption ratio of the polymerizable functional group using an IR absorption spectrum.
  • a clear projected image can be displayed by using the ⁇ / 2 retardation layer in combination with the circularly polarized light reflecting layer.
  • the projected image display part produced by combining the ⁇ / 2 retardation layer and the circularly polarized reflective layer is compared with, for example, the projected image display part using a combination of the ⁇ / 4 retardation layer and the circularly polarized reflective layer. And give higher brightness. Double images can also be prevented.
  • the front phase difference of the ⁇ / 2 retardation layer may be a length that is 1 ⁇ 2 of the visible light wavelength region, or “center wavelength ⁇ n ⁇ 1 ⁇ 2 of the center wavelength (n is an integer)”.
  • the reflection wavelength of the circularly polarized light reflection layer for example, any cholesteric liquid crystal
  • the length of 1 ⁇ 2 of the center wavelength of the light emission wavelength of the light source may be used.
  • the phase difference may be in the range of 190 nm to 390 nm, and the phase difference is preferably in the range of 200 nm to 350 nm.
  • the ⁇ / 2 retardation layer is not particularly limited and may be appropriately selected according to the purpose.
  • birefringence such as a stretched polycarbonate film, a stretched norbornene polymer film, and strontium carbonate is used.
  • examples thereof include a transparent film oriented by containing inorganic particles, a thin film obtained by obliquely depositing an inorganic dielectric on a support, and a film in which a liquid crystal compound is uniaxially oriented and fixed.
  • the ⁇ / 2 retardation layer is preferably a film in which a polymerizable liquid crystal compound is uniaxially aligned and fixed.
  • a liquid crystal composition containing a polymerizable liquid crystal compound is applied to a temporary support or an alignment layer surface, and the polymerizable liquid crystal compound in the liquid crystal composition is formed in a nematic alignment in a liquid crystal state. Thereafter, it can be fixed by curing and formed.
  • the ⁇ / 2 retardation layer can be formed in the same manner as the formation of the cholesteric liquid crystal layer except that no chiral agent is added to the liquid crystal composition.
  • the heating temperature is preferably 50 ° C. to 120 ° C. and more preferably 60 ° C. to 100 ° C. in the nematic alignment after the application of the liquid crystal composition.
  • the ⁇ / 2 retardation layer is formed by applying a composition containing a polymer liquid crystal compound to the surface of a temporary support or an alignment layer to form a nematic alignment in a liquid crystal state, and then fixing the alignment by cooling.
  • the layer obtained may be sufficient.
  • the thickness of the ⁇ / 2 retardation layer is preferably 0.2 ⁇ m to 300 ⁇ m, more preferably 0.5 ⁇ m to 150 ⁇ m, and even more preferably 1.0 ⁇ m to 80 ⁇ m.
  • the thickness of the ⁇ / 2 retardation layer formed from the liquid crystal composition is not particularly limited, but is preferably 0.2 ⁇ m to 10 ⁇ m, more preferably 0.5 ⁇ m to 5.0 ⁇ m, and more preferably 1.0 ⁇ m to 2.0 ⁇ m. Further preferred.
  • the slow axis direction of the ⁇ / 2 retardation layer can be determined according to the incident direction of incident light for projected image display and the spiral sense of the cholesteric liquid crystal layer when used as a head-up display system.
  • the incident light is in the lower (vertically lower) direction of the projected image display portion and may be referred to as “ ⁇ / 2 phase difference layer side” (in this specification, “from the observer side”) with respect to the circularly polarized light reflection layer.
  • the slow axis of the ⁇ / 2 retardation layer is in the range of + 40 ° to + 65 ° or ⁇ 40 ° to ⁇ 65 ° with respect to the vertical upward direction of the projected image display portion.
  • the slow axis direction is preferably set as follows according to the spiral sense of the cholesteric liquid crystal layer in the circularly polarized light reflecting layer.
  • the sense is on the right (preferably when the senses of all cholesteric liquid crystal layers are on the right)
  • the slow axis of the ⁇ / 2 retardation layer is from the observer side with respect to the vertical upward direction of the projected image display portion.
  • it is preferably in the range of 40 ° to 65 °, preferably 45 ° to 60 °.
  • the slow axis of the ⁇ / 2 retardation layer is viewed from the observer side with respect to the vertical upward direction of the projected image display area.
  • it is preferably in the range of 40 ° to 65 °, preferably 45 ° to 60 ° counterclockwise.
  • the projected image display portion in the windshield glass of the present invention may include a second retardation layer in addition to the ⁇ / 2 retardation layer.
  • the second retardation layer may be provided so that the ⁇ / 2 retardation layer, the circularly polarized light reflection layer, and the second retardation layer are in this order.
  • the ⁇ / 2 phase difference layer, the circularly polarized light reflection layer, and the second phase difference layer may be provided in this order from the viewer side.
  • the second retardation layer is referred to as being distinguished from the ⁇ / 2 retardation layer closer to the viewer side.
  • double images can be further prevented.
  • the effect is more remarkable when a low ⁇ n polymerizable liquid crystal compound is used for forming a cholesteric liquid crystal layer in the circularly polarized light reflection layer.
  • the reason that the double image can be further prevented by using the second retardation layer is that light having a wavelength not in the selective reflection band of the cholesteric liquid crystal layer included in the circularly polarized light reflection layer is polarized and converted by the cholesteric liquid crystal layer. It is estimated that a double image based on being reflected on the back surface of the windshield glass can be prevented.
  • the retardation of the second retardation layer may be appropriately adjusted in the range of 160 nm to 460 nm, preferably in the range of 240 nm to 420 nm at the wavelength of 550 nm.
  • the material, thickness, and the like of the second retardation layer can be selected within the same range as the ⁇ / 2 retardation layer.
  • the slow axis direction of the second retardation layer is determined according to the incident direction of incident light for projecting image display and the spiral sense of the cholesteric liquid crystal layer.
  • the second phase difference layer having a phase difference in the range of 160 nm to 400 nm at a wavelength of 550 nm is + 10 ° to + 35 ° or ⁇ 10 ° to ⁇ 35 ° with respect to the vertical direction of the projected image display portion. It is preferable to be in the range.
  • the slow axis of the second retardation layer having a phase difference in the range of 200 nm to 400 nm at the wavelength of 550 nm is + 100 ° to + 140 ° or ⁇ 100 ° to ⁇ 140 ° with respect to the vertical upward direction of the projected image display portion. It is preferable to be in the range.
  • the projected image display area or the half mirror film may include a layer other than the cholesteric liquid crystal layer, the ⁇ / 2 retardation layer, and the second retardation layer. All other layers are preferably transparent in the visible light region. In this specification, being transparent in the visible light region means that the transmittance of visible light is 70% or more. Moreover, it is preferable that all other layers have low birefringence. In the present specification, low birefringence means that the front phase difference is 10 nm or less in the wavelength region where the projected image display portion of the windshield glass of the present invention reflects, and the front phase difference is It is preferable that it is 5 nm or less.
  • the other layers have a small difference in refractive index from the average refractive index (in-plane average refractive index) of the cholesteric liquid crystal layer.
  • other layers include a support, an alignment layer, and an adhesive layer.
  • the support can be a substrate in the formation of the cholesteric liquid crystal layer or the ⁇ / 2 retardation layer.
  • the support is not particularly limited.
  • the support used for forming the cholesteric liquid crystal layer or the ⁇ / 2 retardation layer is a temporary support that is peeled off after forming the cholesteric liquid crystal layer, and is not included in the finished half mirror film or windshield glass. It does not have to be.
  • the support include plastic films such as polyester such as polyethylene terephthalate (PET), polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, and silicone.
  • PET polyethylene terephthalate
  • acrylic resin epoxy resin
  • polyurethane polyamide
  • polyolefin polyamide
  • cellulose derivative polyolefin
  • silicone silicone
  • glass may be used as the temporary support.
  • the thickness of the support may be about 5.0 ⁇ m to 1000 ⁇ m, preferably 10 ⁇ m to 250 ⁇ m, and more preferably 15 ⁇ m to 90 ⁇ m.
  • the projected image display portion may include an alignment layer as a lower layer to which the liquid crystal composition is applied when forming the cholesteric liquid crystal layer or the ⁇ / 2 retardation layer.
  • the alignment layer has a rubbing treatment of organic compounds such as polymers (resins such as polyimide, polyvinyl alcohol, polyester, polyarylate, polyamideimide, polyetherimide, polyamide, modified polyamide), oblique deposition of inorganic compounds, and microgrooves.
  • an alignment layer that generates an alignment function by application of an electric field, application of a magnetic field, or light irradiation may be used.
  • the alignment layer made of a polymer is preferably subjected to a rubbing treatment and then a liquid crystal composition is applied to the rubbing treatment surface.
  • the rubbing treatment can be performed by rubbing the surface of the polymer layer with paper or cloth in a certain direction.
  • the alignment layer does not have to be peeled off together with the temporary support to form a layer constituting the projected image display portion.
  • the thickness of the alignment layer is preferably 0.01 to 5.0 ⁇ m, and more preferably 0.05 to 2.0 ⁇ m.
  • the adhesive layer is provided, for example, between the cholesteric liquid crystal layer, between the circularly polarizing reflection layer and the ⁇ / 2 retardation layer, between the circularly polarizing reflection layer and the second retardation layer, and between the cholesteric liquid crystal layer and the support. It may be done. Further, it may be provided between the circularly polarized light reflecting layer and the intermediate film, between the ⁇ / 2 retardation layer and the intermediate film, or the like.
  • the adhesive layer may be formed from an adhesive.
  • Adhesives include hot melt type, thermosetting type, photocuring type, reactive curing type, and pressure-sensitive adhesive type that does not require curing, from the viewpoint of curing method, and the materials are acrylate, urethane, urethane acrylate, epoxy , Epoxy acrylate, polyolefin, modified olefin, polypropylene, ethylene vinyl alcohol, vinyl chloride, chloroprene rubber, cyanoacrylate, polyamide, polyimide, polystyrene, polyvinyl butyral, etc. can do.
  • the photocuring type is preferable as the curing method, and from the viewpoint of optical transparency and heat resistance, it is preferable to use an acrylate, urethane acrylate, epoxy acrylate, or the like material.
  • the adhesive layer may be formed using a highly transparent adhesive transfer tape (OCA tape).
  • OCA tape a highly transparent adhesive transfer tape
  • a commercially available product for an image display device particularly a commercially available product for the image display unit surface of the image display device may be used.
  • Examples of commercially available products include PANAC Corporation pressure-sensitive adhesive sheets (PD-S1 and the like), MHI Series MHM series pressure-sensitive adhesive sheets, and the like.
  • the thickness of the adhesive layer is preferably 0.5 to 10 ⁇ m, and more preferably 1.0 to 5.0 ⁇ m.
  • the thickness of the adhesive layer formed using the OCA tape may be 10 ⁇ m to 50 ⁇ m, and preferably 15 ⁇ m to 30 ⁇ m. In order to reduce color unevenness and the like of the projected image display part, it is preferable to provide the uniform thickness.
  • the light transmitted through the cholesteric liquid crystal layer in the circularly polarized light reflection layer is circularly polarized light having a sense opposite to that of the circularly polarized light reflected by the cholesteric liquid crystal layer, and reflected light from the back side surface.
  • the circularly polarized light that is usually reflected by the cholesteric liquid crystal layer is mostly, so that it is difficult to produce a noticeable double image.
  • the projection light most of the projection light can be reflected by the circularly polarized light reflection layer.
  • the reflected light from the front surface can cause a noticeable double image.
  • the distance from the center of gravity of the cholesteric liquid crystal layer to the front surface when viewed from the light incident side of the windshield glass is a certain value or more, a double image can be prominent.
  • the total thickness of the layers on the ⁇ / 2 retardation layer side from the circularly polarized reflective layer (not including the thickness of the circularly polarized reflective layer, ⁇ / 2 retardation)
  • the distance from the outermost surface on the ⁇ / 2 retardation layer side of the circularly polarized reflective layer to the outermost surface of the windshield glass on the ⁇ / 2 retardation layer side with respect to the circularly polarized reflective layer Is preferably 2.0 mm or less, more preferably 1.0 mm or less, and particularly preferably 0.5 mm or less from the viewpoint of reduction of double images.
  • Examples of the layer on the viewer side from the circularly polarized light reflecting layer include a ⁇ / 2 retardation layer, a support, an interlayer sheet, and a second glass plate.
  • the windshield glass of the present invention has a remarkable double effect even when the total thickness of the layers closer to the viewing side than the circularly polarized reflective layer is as described above in the projected image display using p-polarized light as described later.
  • the projected image can be viewed without an image.
  • the windshield glass may have a laminated glass configuration. That is, it is preferable to have a structure in which two glass plates are bonded via an intermediate layer.
  • a glass plate located farther from the viewer side may be referred to as a first glass plate, and a glass plate located closer may be referred to as a second glass plate.
  • a glass plate generally used for windshield glass can be used as the glass plate.
  • the thickness of the glass plate is not particularly limited, but may be about 0.5 mm to 5.0 mm, preferably 1.0 mm to 3.0 mm, and more preferably 2.0 to 2.3 mm.
  • Windshield glass having a laminated glass configuration can be manufactured using a known laminated glass manufacturing method. Generally, after sandwiching an interlayer film sheet for laminated glass between two glass plates, heat treatment and pressure treatment (treatment using a rubber roller, etc.) are repeated several times, and finally an autoclave is used. Thus, it can be produced by a method of performing a heat treatment under a pressurized condition.
  • a windshield glass having a laminated glass structure including a half mirror film including a circularly polarizing reflection layer and a ⁇ / 2 retardation layer as an intermediate layer is formed into a normal laminated glass after the half mirror film is formed on the glass plate surface. It may be formed through a process, and may be formed by performing the above heat treatment and pressure treatment using the laminated interlayer sheet for laminated glass including the half mirror film as an interlayer sheet. .
  • the glass plate forming the half mirror film may be the first glass plate or the second glass plate. At this time, the half mirror film should just be bonded by the adhesive agent, for example to the glass plate.
  • Interlayer sheet Any known interlayer film may be used as the interlayer sheet when the interlayer sheet not including the half mirror film is used.
  • a resin film containing a resin selected from the group of polyvinyl butyral (PVB), an ethylene-vinyl acetate copolymer, and a chlorine-containing resin can be used.
  • the resin is preferably a main component of the interlayer sheet.
  • the main component means a component that occupies a ratio of 50% by mass or more of the interlayer film.
  • polyvinyl butyral or ethylene-vinyl acetate copolymer is preferable, and polyvinyl butyral is more preferable.
  • the resin is preferably a synthetic resin.
  • Polyvinyl butyral can be obtained by acetalizing polyvinyl alcohol with butyraldehyde.
  • the preferable lower limit of the degree of acetalization of the polyvinyl butyral is 40%, the preferable upper limit is 85%, the more preferable lower limit is 60%, and the more preferable upper limit is 75%.
  • Polyvinyl alcohol is usually obtained by saponifying polyvinyl acetate, and polyvinyl alcohol having a saponification degree of 80 to 99.8 mol% is generally used. Moreover, the preferable minimum of the polymerization degree of the said polyvinyl alcohol is 200, and a preferable upper limit is 3000. When the polymerization degree of polyvinyl alcohol is 200 or more, the penetration resistance of the obtained laminated glass is difficult to decrease, and when it is 3000 or less, the moldability of the resin film is good, and the rigidity of the resin film does not increase too much. Good workability. A more preferred lower limit is 500, and a more preferred upper limit is 2000.
  • a laminated interlayer sheet for laminated glass including a circularly polarized light reflecting layer and a ⁇ / 2 retardation layer can be formed by bonding the half mirror film to the surface of the interlayer sheet.
  • the half mirror film can be formed by sandwiching the two intermediate film sheets.
  • the two interlayer sheets may be the same or different, but are preferably the same.
  • a known bonding method can be used for bonding the half mirror film and the intermediate film, but it is preferable to use a laminating process.
  • the lamination process is performed under a certain degree of heating and pressurization.
  • the film surface temperature on the side to which the intermediate film sheet adheres is preferably 50 to 130 ° C., more preferably 70 to 100 ° C. It is preferable to apply pressure during lamination.
  • the pressing condition is preferably less than 2.0 kg / cm 2 (less than 196 kPa), more preferably in the range of 0.5 to 1.8 kg / cm 2 (49 to 176 kPa), 0.5 to More preferably, it is in the range of 1.5 kg / cm 2 (49 to 147 kPa).
  • a method for producing a laminated interlayer sheet for laminated glass is as follows: (1) The 1st process of bonding a half mirror film on the surface of the 1st interlayer film sheet, and obtaining the 1st layered product, and (2) a second step of bonding the second interlayer film sheet to the surface opposite to the surface where the first interlayer film sheet of the half mirror film in the first laminate is bonded; Including. In the first step, the half mirror film and the first intermediate film are bonded together, and the support is peeled off.
  • the second intermediate film is placed on the surface from which the support is peeled off.
  • a laminated interlayer sheet for laminated glass to be bonded a laminated interlayer sheet for laminated glass that does not include a support can be produced, and by using this laminated interlayer sheet for laminated glass, support is achieved.
  • a laminated glass containing no body can be easily produced.
  • the temperature of the substrate when peeling the support from the half mirror film is preferably 40 ° C. or higher, more preferably 40 to 60 ° C. .
  • the windshield glass of the present invention can be used as a component of a head-up display system.
  • the head-up display system includes a projector.
  • the “projector” is “an apparatus that projects light or an image”, and includes an “apparatus that projects a drawn image”.
  • the projector may be arranged so that it can enter the projected image display part in the windshield glass at an oblique incident angle of 45 ° to 70 ° with respect to the normal line of the projected image display part. That's fine.
  • the projector preferably includes a drawing device and reflects and displays an image (real image) drawn on a small intermediate image screen as a virtual image by a combiner.
  • the drawing device itself may be a device that displays an image, or may be a device that emits light capable of drawing an image.
  • the light from the light source may be adjusted by a drawing method such as an optical modulator, laser luminance modulation means, or light deflection means for drawing.
  • the drawing device means a device that includes a light source and further includes a light modulator, a laser luminance modulation unit, a light deflection unit for drawing, or the like according to a drawing method.
  • the light source is not particularly limited, and LEDs (including light emitting diodes and organic light emitting diodes (OLED)), discharge tubes, laser light sources, and the like can be used. Of these, LEDs and discharge tubes are preferred. This is because it is suitable for a light source of a drawing device that emits linearly polarized light. Of these, LEDs are particularly preferred. This is because LEDs are suitable for combination with a combiner using a cholesteric liquid crystal layer exhibiting selective reflection in a specific wavelength region, as will be described later, because the emission wavelength is not continuous in the visible light region.
  • LEDs including light emitting diodes and organic light emitting diodes (OLED)
  • LEDs and discharge tubes are preferred. This is because it is suitable for a light source of a drawing device that emits linearly polarized light. Of these, LEDs are particularly preferred. This is because LEDs are suitable for combination with a combiner using a cholesteric liquid crystal layer exhibiting selective reflection in a specific wavelength region, as will be described later
  • the drawing method can be selected according to the light source to be used and the application, and is not particularly limited.
  • Examples of the drawing method include a fluorescent display tube, a liquid crystal display (LCD) method using liquid crystal and a liquid crystal on silicon (LCOS) method, a DLP (digital light processing) method, and a scanning method using a laser.
  • Etc. The drawing method may be a method using a fluorescent display tube integrated with a light source.
  • the DLP system is a display system using DMD (Digital Micromirror Device), and is drawn by arranging micromirrors for the number of pixels, and light is emitted from a projection lens.
  • the scanning method is a method in which a light beam is scanned on a screen and an image is contrasted using an afterimage of an eye. For example, the descriptions in JP-A-7-270711 and JP-A-2013-228664 can be referred to.
  • laser light of each color for example, red light, green light, and blue light
  • the luminance modulation of laser light of each color may be performed directly as a change in intensity of the light source, or may be performed by an external modulator.
  • the light deflection means include a galvanometer mirror, a combination of a galvanometer mirror and a polygon mirror, or MEMS (microelectromechanical system).
  • MEMS is preferable.
  • the scanning method include a random scan method and a raster scan method, but it is preferable to use a raster scan method.
  • the laser beam can be driven by a resonance frequency in the horizontal direction and a sawtooth wave in the vertical direction, for example. Since the scanning system does not require a projection lens, the apparatus can be easily downsized.
  • the light emitted from the drawing device may be linearly polarized light or natural light (non-polarized light).
  • the light emitted from the drawing device included in the head-up display system of the present invention is preferably linearly polarized light.
  • the emitted light is essentially linearly polarized light.
  • the output light is a linearly polarized light drawing device and the output light contains light of a plurality of wavelengths (colors)
  • the polarization directions (transmission axis directions) of the plurality of light polarizations are the same or orthogonal to each other It is preferable.
  • the drawing device may use an intermediate image screen.
  • an “intermediate image screen” is a screen on which an image is drawn. That is, when the light emitted from the drawing device is not yet visible as an image, the drawing device forms a visible image on the intermediate image screen by this light.
  • the image drawn on the intermediate image screen may be projected onto the combiner by light transmitted through the intermediate image screen, or may be projected onto the combiner after reflecting off the intermediate image screen.
  • the intermediate image screen examples include a scattering film, a microlens array, and a screen for rear projection.
  • a plastic material is used as the intermediate image screen, if the intermediate image screen has birefringence, the polarization plane and light intensity of polarized light incident on the intermediate image screen are disturbed, and color unevenness is likely to occur in the combiner.
  • the use of a retardation film having a predetermined phase difference can reduce the problem of color unevenness.
  • the intermediate image screen preferably has a function of spreading and transmitting incident light. This is because the projected image can be enlarged and displayed.
  • a screen composed of a microlens array can be cited.
  • the microarray lens used in the head-up display is described in, for example, Japanese Patent Application Laid-Open No. 2012-226303, Japanese Patent Application Laid-Open No. 2010-145745, and Japanese Patent Application Publication No. 2007-523369.
  • the projector may include a reflecting mirror that adjusts the optical path of the projection light formed by the drawing device.
  • JP-A-2-141720, JP-A-10-96874, JP-A-2003-98470, US Pat. No. 5,013,134 are disclosed. Reference can be made to JP-T-2006-512622.
  • the windshield glass of the present invention is particularly useful for a head-up display system using a laser, LED, OLED or the like whose emission wavelength is not continuous in the visible light region in combination with a projector using a light source. This is because the central wavelength of selective reflection of the cholesteric liquid crystal layer can be adjusted according to each emission wavelength. Moreover, it can also be used for the projection of a display in which display light such as an LCD (liquid crystal display) is polarized.
  • LCD liquid crystal display
  • Incident light may be incident on the circularly polarized light reflecting layer from the ⁇ / 2 phase difference layer side and incident on the circularly polarized light reflecting layer via the ⁇ / 2 phase difference layer. That is, a ⁇ / 2 retardation layer may be disposed on the incident side of the projection light with respect to the circularly polarized light reflection layer. Further, it is preferable that the incident light is incident at an oblique incident angle of 45 ° to 70 ° with respect to the normal line of the projected image display portion.
  • the Brewster angle at the interface between glass having a refractive index of about 1.51 and air having a refractive index of about 1 is about 56 °, and p-polarized light is incident within the above-mentioned angle range, so that incident light for displaying a projected image is displayed.
  • the circularly polarized reflective layer has less reflected light from the surface of the ⁇ / 2 retardation layer, and can display an image with less influence of a double image.
  • the angle is preferably 50 ° to 65 °. At this time, the projection image is observed on the incident light incident side at an angle of 45 ° to 70 °, preferably 50 ° to 65 ° on the opposite side of the incident light with respect to the normal line of the ⁇ / 2 retardation layer. Any configuration can be used.
  • Incident light may be incident from any direction such as up / down / left / right of the windshield glass, and may be determined according to the direction of the observer.
  • the incident light may be incident at an oblique incident angle as described above from the downward direction during use.
  • the slow axis of the ⁇ / 2 retardation layer in the windshield glass preferably forms an angle of 40 ° to 65 ° with respect to the vibration direction of the incident p-polarized light (incident light incident surface). More preferably, the angle is 45 ° to 60 °.
  • the projection light at the time of projection image display on the head-up display is p-polarized light that vibrates in a direction parallel to the incident surface.
  • the output light of the projector is not linearly polarized light, it may be p-polarized by using a linearly polarizing film arranged on the output light side of the projector, and it is made p-polarized in the optical path from the projector to the windshield glass. Also good.
  • the polarization direction is adjusted in a wavelength-selective manner, and p-polarized light is used in all color wavelength ranges. It is preferable to make it enter.
  • the head-up display system may be a projection system in which the virtual image formation position is variable.
  • a projection system is described in, for example, Japanese Patent Application Laid-Open No. 2009-150947.
  • the virtual image imaging position is a position where a virtual image can be visually recognized by the driver of the vehicle, and is, for example, a position that is 1000 mm or more away from the tip of the windshield glass when viewed from the normal driver.
  • the glass is non-uniform (wedge shape) in the projected image display part as described in the above-mentioned Japanese Translation of PCT International Publication No.
  • the angle of the wedge shape also changes when the virtual image forming position is changed. Need to do. Therefore, for example, as described in Japanese Patent Application Laid-Open No. 2017-15902, it is necessary to cope with a virtual image imaging position change by changing the projection position by partially changing the wedge-shaped angle.
  • the use of wedge-shaped glass is unnecessary, and the thickness of the glass is made uniform in the projected image display portion. Therefore, it is possible to suitably employ a projection system in which the virtual image imaging position is variable.
  • ⁇ Preparation of ⁇ / 2 retardation layer> The surface of Toyobo Co., Ltd. Cosmo Shine A-4100 (PET, thickness 75 ⁇ m) that has not been subjected to an easy adhesion treatment is rubbed, and the coating film 1 shown in Table 1 has a dry film thickness of 1.8 ⁇ m after drying. It applied at room temperature using a wire bar.
  • MEK methyl ethyl ketone
  • the coating layer was dried at room temperature for 30 seconds, then heated at 85 ° C. for 2 minutes, and then at 60 ° C.
  • the coating liquid UV shown in Table 2 was applied at room temperature using a wire bar so that the dry film thickness after drying was 3 ⁇ m.
  • the coating liquid B, the coating liquid G, the coating liquid R, and the coating liquid IR shown in Table 2 an 8: 2 mixed liquid of methyl acetate and cyclohexanone was used as the solvent, and the solid content concentration was 25 mass. The amount of solvent was adjusted to be%.
  • the coating layer was dried at room temperature for 30 seconds, then heated at 85 ° C. for 2 minutes, and then at 60 ° C. with a fusion D bulb (90 mW / cm lamp) at an output of 60% for 6 to 12 seconds with UV irradiation. Then, a liquid crystal layer was prepared, and a reflective layer UV with a PET base was obtained.
  • An OCA tape (MHM-UVC15, manufactured by Nichiei Kako Co., Ltd.) was bonded to an acrylic plate (thickness 0.2 mm, 40 mm square).
  • the release film of the OCA tape was peeled off, and a ⁇ / 2 retardation layer with a PET base was bonded onto the OCA tape on the surface on the ⁇ / 2 retardation layer side.
  • the PET was peeled off to produce a ⁇ / 2 retardation layer with an acrylic plate.
  • the retardation of the ⁇ / 2 retardation layer with an acrylic plate was measured using an AxoScan manufactured by Axometrics, and was used as the retardation of the ⁇ / 2 retardation layer. The results are shown in Table 3.
  • Table 4 shows combinations of the reflective layer UV, the reflective layer B, the reflective layer G, the reflective layer R, and the IR layer on the surface on the ⁇ / 2 retardation layer side of the ⁇ / 2 retardation layer with a PET base prepared in the same manner as described above.
  • Table 4 shows combinations of the reflective layer UV, the reflective layer B, the reflective layer G, the reflective layer R, and the IR layer on the surface on the ⁇ / 2 retardation layer side of the ⁇ / 2 retardation layer with a PET base prepared in the same manner as described above.
  • a coating solution for forming each layer on the ⁇ / 2 retardation layer or the reflective layer in the same manner as described above so that the thickness of the layer after drying becomes the thickness shown in Table 3. In the same manner as described above, drying and UV irradiation were performed.
  • Examples 1 and 2 and Comparative Examples 1 and 2 Production of Windshield Glass of Example 1
  • Adhesive layer OCA tape: MHM-UVC15 manufactured by NEIEI KAKO Co., Ltd.
  • Film HM-1 was bonded using a roller so that the reflective layer was on the glass surface side.
  • the PET which was the base of the retardation layer, was peeled off and a 0.38 mm PVB (polyvinyl butyral) made by Sekisui Chemical Co., Ltd.
  • the slow axis direction of the retardation layer of the half mirror film HM-1 is arranged so as to be 60 ° in the clockwise direction with respect to the short side direction of the glass when viewed from the glass side having a thickness of 2 mm. did.
  • the laminate was held at 90 ° C. and 0.1 atm for 1 hour, and then heated at 115 ° C. and 13 atm for 20 minutes to remove bubbles to obtain the windshield glass of Example 1.
  • the optical evaluation was performed with the arrangement shown in FIG.
  • the produced windshield glass was tilted so that the long side was horizontal and the short side was vertical and the glass side having a thickness of 2 mm was downward, and an image was projected on the glass side. An image was projected from the glass side having a thickness of 2 mm, and the image was observed.
  • the distance between the windshield glass and the liquid crystal panel was 200 mm.
  • the evaluation was performed for the polarization direction of the projection light shown in Table 5.
  • the p-polarized light in Table 5 is linearly polarized light whose electric vector oscillation plane is parallel to the paper surface and s-polarized light is perpendicular to the paper surface in FIG.
  • Luminance and chromaticity were measured using a luminance meter BM-5A manufactured by Topcon Corporation with a white solid image displayed on the liquid crystal panel 2. The double image was evaluated by visually displaying white characters on a liquid crystal panel on a black background. The evaluation criteria were as follows. A: Characters are readable under room lighting and indoor darkness B: Characters are readable under room lighting. Obfuscated in the dark (non-acceptable level) C: Letters are difficult to read even under indoor lighting or in the dark
  • Example 3 The same evaluation as described above was performed using the windshield glass of Example 2 and setting the distance between the windshield glass and the liquid crystal panel to 1500 mm. Since the distance between the windshield glass and the liquid crystal panel is increased as compared with the second embodiment, the virtual image formation position is farther from the driver (reference numeral 3 in FIG. 1). The evaluation results are shown in Table 5.

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Abstract

L'invention concerne un système d'affichage tête haute présentant une réduction des images doubles, et permettant l'affichage d'une image de réflexion et de transmission élevée, et une vitre de pare-brise mise en œuvre dans ledit système d'affichage tête haute. Plus précisément, l'invention fournit une vitre de pare-brise telle qu'une zone affichage d'image projetée ne se remarque pas du dehors sous une lumière extérieure. Le système d'affichage tête haute contient : la vitre de pare-brise qui contient à son tour la zone affichage d'image projetée, laquelle zone affichage d'image projetée contient une couche de réflexion de lumière polarisée et une couche et une couche de déphasage λ／２, laquelle couche de réflexion de lumière polarisée contient quatre couches de cristaux liquides cholestériques ou plus, une desdites quatre couches de cristaux liquides cholestériques ou plus possédant une longueur d'onde centrale de réflexion sélective supérieure ou égale à 350nm et inférieure à 490nm ; et un projecteur.
PCT/JP2017/038852 2016-11-04 2017-10-27 Vitre de pare-brise, système d'affichage tête haute, et film demi-miroir WO2018084076A1 (fr)

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EP17867431.3A EP3537190A4 (fr) 2016-11-04 2017-10-27 Vitre de pare-brise, système d'affichage tête haute, et film demi-miroir
CN201780065806.0A CN109863430A (zh) 2016-11-04 2017-10-27 挡风玻璃、平视显示器系统及半反射镜膜
US16/383,207 US20190235243A1 (en) 2016-11-04 2019-04-12 Windshield glass, head-up display system, and half-mirror film

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JP2016-215911 2016-11-04
JP2016215911 2016-11-04
JP2017-049013 2017-03-14
JP2017049013A JP6768567B2 (ja) 2016-11-04 2017-03-14 ウインドシールドガラス、ヘッドアップディスプレイシステム、およびハーフミラーフィルム

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WO2020166691A1 (fr) * 2019-02-14 2020-08-20 富士フイルム株式会社 Élément optique, élément de guidage de lumière et élément d'affichage d'image
JPWO2020184714A1 (fr) * 2019-03-13 2020-09-17
CN113238378A (zh) * 2021-04-14 2021-08-10 福耀玻璃工业集团股份有限公司 一种抬头显示系统
JPWO2020075740A1 (ja) * 2018-10-12 2021-09-30 富士フイルム株式会社 光学積層体、導光素子およびａｒ表示デバイス
JPWO2020075738A1 (ja) * 2018-10-12 2021-10-07 富士フイルム株式会社 光学積層体、導光素子および画像表示装置
JPWO2022054902A1 (fr) * 2020-09-14 2022-03-17
CN115023754A (zh) * 2020-01-31 2022-09-06 麦克赛尔株式会社 车辆用信息显示系统和信息显示系统
WO2022196732A1 (fr) * 2021-03-19 2022-09-22 日本化薬株式会社 Film fonctionnel optique pour affichage tête haute, stratifié optique, verre fonctionnel et système d'affichage tête haute
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