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WO2017145580A1 - Rétroviseur de véhicule à fonction d'affichage d'image et procédé de fabrication associé - Google Patents

Rétroviseur de véhicule à fonction d'affichage d'image et procédé de fabrication associé Download PDF

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Publication number
WO2017145580A1
WO2017145580A1 PCT/JP2017/001477 JP2017001477W WO2017145580A1 WO 2017145580 A1 WO2017145580 A1 WO 2017145580A1 JP 2017001477 W JP2017001477 W JP 2017001477W WO 2017145580 A1 WO2017145580 A1 WO 2017145580A1
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WO
WIPO (PCT)
Prior art keywords
image display
layer
mirror
display function
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/001477
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English (en)
Japanese (ja)
Inventor
久史 津端
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
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Fujifilm Corp
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Filing date
Publication date
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Publication of WO2017145580A1 publication Critical patent/WO2017145580A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/20—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/22—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle
    • B60R1/23—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle with a predetermined field of view
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/02—Rear-view mirror arrangements
    • B60R1/04—Rear-view mirror arrangements mounted inside vehicle
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present invention relates to a mirror with an image display function for a vehicle provided with an image display unit capable of displaying a photographed image around the vehicle and a method for manufacturing the same.
  • a mirror with an image display function has been proposed in which a half mirror composed of a reflective polarizing plate or the like is disposed on the image display surface of an image display device (see Patent Document 1).
  • a half mirror composed of a reflective polarizing plate or the like is disposed on the image display surface of an image display device (see Patent Document 1).
  • the half mirror acts as a mirror surface, and a reflected image based on the reflected light from the mirror surface is visually recognized by the user.
  • Patent Document 2 and Patent Document 3 it is proposed to use a rear-view mirror by displaying a photographed image of the periphery of the vehicle on the image display section of the mirror with an image display function as described above.
  • the mirror with an image display function of Patent Document 1 includes a transparent substrate and a polarizing reflection plate formed on the transparent substrate, and is configured by arranging the polarizing reflection plate and the transparent substrate in this order from the image display unit side.
  • an optical compensation layer such as a quarter-wave plate or a high retardation plate is further provided so that a clear image and mirror reflection image can be visually recognized without direction dependency even when the user uses polarized sunglasses. It is conceivable to provide it.
  • FIG. 10 shows an example of a mirror with an image display function in which a quarter wavelength plate is further provided for the mirror with an image display function as described in Patent Document 1.
  • a mirror 100 with an image display function shown in FIG. 10 is configured by arranging a quarter-wave plate 104 and a linearly polarized light reflection layer 103 in this order from the front plate 105 made of a transparent substrate toward the image display unit 101 side. It is configured.
  • the quarter-wave plate 104 and the front plate 105, and the linearly polarized reflection layer 103 and the quarter-wave plate 104 are an OCR (Optically Clear Resin) (optically transparent resin) or OCA (Optically Clear Adhesive) sheet, respectively. It is conceivable to bond using an optical transparent adhesive sheet or the like.
  • OCR Optically Clear Resin
  • OCA Optically Clear Adhesive
  • the present invention is a vehicle capable of visually recognizing a clear image and a mirror reflection image without direction dependency even when a user uses polarized sunglasses or the like, and suppressing distortion of the reflection image.
  • An object of the present invention is to provide a mirror with an image display function and a method for manufacturing the same.
  • the mirror with an image display function for a vehicle is a mirror with an image display function for a vehicle including an image display unit capable of displaying a captured image of the periphery of the vehicle.
  • a dichroic polarization reflection layer on which the displayed imaged image light is incident, a front plate made of glass or plastic, and an optical compensation layer are arranged, and the dichroic polarization reflection layer and the front plate are a single layer first. It is characterized by being adhered by an adhesive layer, and the front plate and the optical compensation layer are adhered by a single second adhesive layer.
  • the first adhesive layer preferably has a thickness of 10 ⁇ m or more and 25 ⁇ m or less.
  • the first adhesive layer is preferably an optical transparent adhesive sheet.
  • the thickness of the second adhesive layer is preferably 10 ⁇ m or more and 25 ⁇ m or less.
  • the second adhesive layer is preferably an optical transparent adhesive sheet.
  • the dichroic polarization reflection layer can be a linear polarization reflection layer.
  • the linearly polarized light reflecting layer can have a multilayer structure in which thin films having different birefringence are alternately laminated.
  • the optical compensation layer can be a quarter wavelength plate.
  • the optical compensation layer can be a high retardation plate.
  • the optical compensation layer can be composed of a quarter-wave plate and a high retardation plate.
  • the dichroic polarization reflection layer can be a circular polarization reflection layer.
  • the optical compensation layer can be a high retardation plate.
  • the optical compensation layer can be a quarter wavelength plate.
  • the surface of the optical compensation layer opposite to the front plate side can be subjected to a hard coat treatment with a pencil hardness of 2H or more.
  • a protective plate made of glass or plastic can be provided on the side opposite to the front plate side of the optical compensation layer.
  • a manufacturing method of a mirror with an image display function for a vehicle of the present invention is a manufacturing method of a mirror with an image display function for a vehicle according to the present invention, wherein a sheet-like second adhesive layer is formed on an optical compensation layer, A front plate is laminated on the second adhesive layer, a sheet-like first adhesive layer is formed on the front plate, and a dichroic polarizing reflection layer is laminated on the first adhesive layer.
  • the thickness of the first adhesive layer is preferably 10 ⁇ m or more and 25 ⁇ m or less.
  • an optical transparent adhesive sheet is preferably used as the first adhesive layer.
  • the thickness of the second adhesive layer is preferably 10 ⁇ m or more and 25 ⁇ m or less.
  • an optical transparent adhesive sheet as the second adhesive layer.
  • the dichroic polarization reflection layer, the front plate, and the optical compensation layer are arranged in this order from the image display unit side.
  • the front plate is bonded by a single first adhesive layer
  • the front plate and the optical compensation layer are bonded by a single second adhesive layer.
  • the dichroic polarizing reflection layer and the optical compensator are bonded to the front plate by a single adhesive layer, respectively, so that even when the user is using polarized sunglasses, etc., it is clear without direction dependency. An image and a mirror reflection image can be visually recognized, and distortion of the reflection image can be suppressed.
  • the figure which shows schematic structure of the room mirror for vehicles using one Embodiment of the mirror with an image display function for vehicles of this invention The perspective view which shows schematic structure of one Embodiment of the mirror with an image display function for vehicles of this invention.
  • Sectional drawing which shows schematic structure of 1st Embodiment of the mirror with a vehicle image display function of this invention.
  • Sectional drawing which shows the modification of the mirror with a vehicle image display function of 1st Embodiment Sectional drawing which shows schematic structure of 2nd Embodiment of the mirror with an image display function for vehicles of this invention.
  • Sectional drawing which shows the modification of the mirror with a vehicle image display function of 1st Embodiment The figure for demonstrating each process of the manufacturing method of the mirror with a vehicle image display function of 2nd Embodiment.
  • Sectional drawing which shows the modification of the mirror with a vehicle image display function of 2nd Embodiment
  • Sectional drawing which shows schematic structure of the mirror with the image display function for vehicles of a comparative example
  • FIG. 1 is a diagram showing a schematic configuration of a vehicular room mirror using a vehicular image display function mirror according to the present embodiment.
  • ⁇ is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.
  • an angle such as “45 °”, “parallel”, “vertical” or “orthogonal” is within a range where the difference from the strict angle is less than 5 degrees unless otherwise specified. It means that there is. The difference from the exact angle is preferably less than 4 degrees, and more preferably less than 3 degrees.
  • (meth) acrylate is used in the meaning of “one or both of acrylate and methacrylate”.
  • the room mirror 1 of the present embodiment includes a mirror 10 with a vehicle image display function and a rectangular frame 11 to which the mirror 10 with a vehicle image display function is attached.
  • the vehicle image display function-equipped mirror 10 is used as a room mirror in the vehicle.
  • the present invention is not limited thereto, and may be used as a side mirror or a mirror attached to another vehicle. Good.
  • the mirror 10 with an image display function for a vehicle includes an image display unit 20 that can display a captured image around the vehicle, and circularly polarized light on which the captured image light displayed on the image display unit 20 is incident.
  • the reflection part 12 is provided.
  • the image display unit 20 is capable of displaying a photographed image photographed by a CCD (Charge-Coupled Device) camera or a CMOS (Complementary Metal-Oxide Semiconductor) camera or the like for photographing the periphery of the rear and / or side of the vehicle, for example. is there. Specifically, a liquid crystal display device is preferable.
  • the image display unit 20 is preferably an image display device that forms an image by emitting (emitting light) linearly polarized light.
  • the image display unit 20 may be a transmissive display device or a reflective display device, and is particularly preferably a transmissive display device.
  • the liquid crystal display device includes an IPS (In-Plane Switching) mode, an FFS (Fringe Field Switching) mode, a VA (Vertical Alignment) mode, an ECB (Electrically Controlled Birefringence) mode, and STN.
  • IPS In-Plane Switching
  • FFS Fe Field Switching
  • VA Very Alignment
  • ECB Electrical Controlled Birefringence
  • STN STN.
  • Any liquid crystal display device such as a (SuperTwisted Nematic) mode, a TN (TwistedONematic) mode, and an OCB (Optically Compensated ⁇ ⁇ ⁇ Bend) mode may be used.
  • the image displayed on the image display unit 20 may be a still image of the captured image or a moving image, and simple character information different from the captured image may be displayed on the image display unit 20.
  • any of mono color display, multi color display, and full color display may be used.
  • the circularly polarized light reflection unit 12 is provided on the image display surface 20 a side of the image display unit 20.
  • the circularly polarized light reflecting portion 12 functions as a semi-transmissive and semi-reflective layer in the vehicle image display function mirror 10. That is, when the captured image is displayed on the image display unit 20, the circularly polarized light reflection unit 12 transmits the emitted light (captured image light) from the image display unit 20, thereby providing a mirror with an image display function for vehicles. 10 so that a photographed image is displayed on the front surface.
  • the circularly polarized light reflection unit 12 receives incident light from the side opposite to the image display unit 20 side (from the arrow S direction side shown in FIG. 2). It reflects and functions so that the front surface of the mirror 10 with a vehicle image display function becomes a mirror. With such a function, the user A can visually recognize the captured image when the captured image is displayed on the image display unit 20, and the vehicle image when the image display unit 20 is not displayed. An image based on the reflected light reflected from the front surface of the mirror 10 with a display function can be viewed.
  • FIG. 3 shows a cross-sectional view taken along the line B-C of the vehicle image display function mirror 10 shown in FIG.
  • the circularly polarized light reflecting portion 12 includes a linearly polarized light reflecting layer 21, a front plate 22 made of glass or plastic, and a quarter wavelength plate 23.
  • the linearly polarized light reflecting layer 21 corresponds to a dichroic polarized light reflecting layer
  • the quarter wavelength plate 23 corresponds to an optical compensation layer.
  • the linearly polarized light reflection layer 21, the front plate 22, and the quarter wavelength plate 23 are arranged in this order from the image display unit 20 side. That is, the linearly polarized light reflecting layer 21 is disposed on the image display unit 20 side with respect to the front plate 22, and the quarter wavelength plate 23 is disposed on the opposite side of the image display unit 20 side with respect to the front plate 22.
  • the circularly polarized light reflecting portion 12 functions as a semi-transmissive and semi-reflective layer.
  • the mirror surface M is formed on the surface 21 a on the front plate 22 side of the linearly polarized light reflecting layer 21. .
  • the linearly polarized light reflection layer 21 and the front plate 22 are bonded by a single first adhesive layer 24, and the front plate 22 and the quarter-wave plate 23 are bonded by a single second adhesive layer 25. ing.
  • the adhesion by the single first adhesive layer 24 or the second adhesive layer 25 is between the linearly polarized light reflecting layer 21 and the front plate 22 or between the front plate 22 and the quarter-wave plate 23. It means that only one adhesive layer is arranged without including any adhesive layer other than the first adhesive layer 24 or the second adhesive layer 25.
  • the first adhesive layer 24 itself and the second adhesive layer 25 itself may be formed from a plurality of layers.
  • the linearly polarized light reflection layer 21 and the front plate 22 are bonded by a single first adhesive layer 24, and the image display unit 20 side with respect to the front plate 22.
  • a quarter-wave plate 23 is arranged on the opposite side to the above. Therefore, the light emitted from the quarter-wave plate 23 becomes circularly polarized light, and even when the user is using polarized sunglasses, a clear image and a mirror reflection image can be visually recognized without direction dependency, and as shown in FIG.
  • the distortion of the reflected image can be suppressed.
  • the front plate 22 and the quarter-wave plate 23 are also bonded by the single second adhesive layer 25, the distortion of the reflected image can be further suppressed.
  • an OCA sheet optical transparent adhesive sheet
  • the OCA sheet is a double-sided pressure-sensitive adhesive sheet in which an optically transparent pressure-sensitive adhesive is formed in a sheet shape, and is sandwiched between two release sheets.
  • the release sheet described above is peeled off from the pressure-sensitive adhesive layer.
  • the OCA sheet is easy to handle because it is sandwiched between two release sheets.
  • the OCA sheet is a gel-like soft adhesive sheet and does not require a curing step like OCR, and there is no change in properties before and after bonding.
  • OCR requires a process of curing with heat, moisture or ultraviolet light after being applied to the object to be bonded, and is a liquid before being applied and bonded, and is cured after being bonded. It becomes solid by the process.
  • the OCA sheet can be used in a process of bonding members wound in a roll shape, and is suitable for bonding large-area members. Compared with the case where a large-area member is bonded by OCR, the equipment can be made smaller.
  • the product name: 81/82 series (manufactured by 3M Japan)
  • the product name: KF4 series (manufactured by New Tac Kasei Co., Ltd.)
  • the product name: FWD series (Nikei Kako Co., Ltd.)
  • trade name: TD series (Yodogawa Paper Co., Ltd.)
  • the thickness of the first adhesive layer 24 and the second adhesive layer 25 is preferably 10 ⁇ m or more and 25 ⁇ m or less.
  • the thickness of the 1st adhesion layer 24 and the 2nd adhesion layer 25 shall be 10 micrometers or more.
  • the thickness of the 1st adhesion layer 24 and the 2nd adhesion layer 25 shall be 25 micrometers or less, the orange peel-like unevenness
  • the linearly polarized light reflecting layer 21 and the quarter wavelength plate 23 are bonded so that the slow axis of the quarter wavelength plate 23 is 45 ° with respect to the polarized light reflecting axis of the linearly polarized light reflecting layer 21. You just need to match. Further, when the photographic image light emitted from the image display unit 20 is linearly polarized light, the polarization reflection axis of the linearly polarized light reflecting layer 21 may be adjusted so as to transmit this linearly polarized light.
  • the film thickness of the circularly polarized light reflecting portion 12 is preferably 2.0 ⁇ m to 300 ⁇ m, more preferably 8.0 ⁇ m to 200 ⁇ m.
  • linearly polarized light reflecting layer 21 for example, a dielectric multilayer film, a polarizer having a multilayer structure in which thin films having different birefringence are alternately laminated, a wire grid polarizer, a polarization prism, a scattering anisotropic polarizer, or the like is used. be able to.
  • the dielectric multilayer film examples include a multilayer film in which a plurality of dielectric materials having different refractive indexes are laminated on a support from an oblique direction by vacuum deposition or sputtering.
  • a plurality of optically anisotropic dielectric thin films and optically isotropic dielectric thin films are alternately laminated. This is produced, for example, by alternately laminating a layer from an oblique direction and a layer from a vertical direction on a support.
  • Lamination may be performed with one kind of material or with two or more kinds of materials.
  • the number of laminated layers is preferably 10 to 500 layers, more preferably 50 to 300 layers.
  • the material to be laminated examples include Ta 2 O 5 , TiO 2 , SiO 2 , and LaTiO 3 .
  • the method for forming the dielectric multilayer film is not particularly limited and may be appropriately selected depending on the intended purpose.
  • vacuum deposition methods such as ion plating and ion beam
  • physical vapor deposition methods such as sputtering
  • sputtering Examples thereof include PVD (Physical Vapor Deposition) method and chemical vapor deposition (CVD (Chemical Vapor Deposition) method.
  • PVD Physical Vapor Deposition
  • CVD Chemical Vapor Deposition
  • the vacuum evaporation method and the sputtering method are preferable, and the sputtering method is particularly preferable.
  • polarizer having a multilayer structure in which thin films having different birefringence are alternately laminated for example, those described in JP-T-9-506837 can be used.
  • a polarizer when processed under conditions selected to obtain a refractive index relationship, a polarizer can be formed using a wide variety of materials.
  • one of the first materials needs to have a different refractive index than the second material in the chosen direction.
  • This difference in refractive index can be achieved in a variety of ways, including stretching, extrusion, or coating during or after film formation.
  • DBEF Dual Brightness Enhancement Film
  • APF Advanced Polarizer Film
  • a wire grid type polarizer is a polarizer that transmits one of polarized light and reflects the other by birefringence of a fine metal wire.
  • the wire grid polarizer is a periodic arrangement of metal wires, and is mainly used as a polarizer in the terahertz wave band. In order for the wire grid to function as a polarizer, the wire interval needs to be sufficiently smaller than the wavelength of the incident electromagnetic wave.
  • metal wires are arranged at equal intervals. The polarization component in the polarization direction parallel to the longitudinal direction of the metal wire is reflected by the wire grid polarizer, and the polarization component in the perpendicular polarization direction is transmitted through the wire grid polarizer.
  • a commercially available product can be used as the wire grid polarizer, for example, a wire grid polarizing filter 50 ⁇ 50, NT46-636 manufactured by Edmund Optics, Inc., or the like can be used.
  • the quarter wave plate 23 is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a quartz plate, a stretched polycarbonate film, a stretched norbornene polymer film, and strontium carbonate. A transparent film containing inorganic particles having birefringence and oriented, or a thin film obtained by obliquely depositing an inorganic dielectric on a support can be used.
  • Examples of the quarter-wave plate 23 include a birefringent film having a large retardation, a birefringent film having a small retardation, and the like described in JP-A-5-27118 and JP-A-5-27119. Are made of the same material as a retardation film laminated so that their optical axes are orthogonal, a polymer film described in JP-A-10-68816, which has a quarter wavelength at a specific wavelength.
  • a quarter wave can be achieved in a wide wavelength region using a retardation plate that can achieve a quarter wavelength in a wide wavelength region using a modified polycarbonate film, or a cellulose acetate film described in International Publication No. 2000/65384 pamphlet.
  • a retardation plate that can be used can be used.
  • As the quarter wavelength plate a commercially available product can be used, for example, trade name: Pure Ace (registered trademark) WR (manufactured by Teijin Limited) or the like can be used.
  • the quarter wavelength plate 23 may be formed by arranging and fixing a polymerizable liquid crystal compound or a polymer liquid crystal compound.
  • a liquid crystal composition is applied to a support or an alignment film, and a polymerizable liquid crystal compound in the liquid crystal composition is formed into a nematic alignment in a liquid crystal state and then fixed by photocrosslinking or thermal crosslinking.
  • the quarter-wave plate is formed by applying a liquid crystal composition on a surface of a support, an alignment film, or a front plate to form a nematic alignment in a liquid crystal state, and then cooling the composition. It may be a layer obtained by fixing the orientation.
  • the liquid crystal composition contains a polymerizable liquid crystal compound, and may further contain a surfactant, a polymerization initiator, or the like as necessary.
  • a liquid crystal composition to which a solvent or the like is added if necessary is applied to a support, an alignment film, or a retardation layer to be a lower layer, and after the alignment aging, the liquid crystal composition is fixed by curing and the quarter-wave plate 23. Can be formed.
  • a rod-like liquid crystal compound may be used as the polymerizable liquid crystal compound.
  • the rod-like polymerizable liquid crystal compound include a rod-like nematic liquid crystal compound.
  • rod-like nematic liquid crystal compounds 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. Examples of polymerizable liquid crystal compounds are described in Makromol. Chem. , 190, 2255 (1989), Advanced Materials, 107 (1993), U.S. Pat. Nos.
  • 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.
  • 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. Nos. 2,367,661 and 2,367,670), acyloin ether (described in US Pat. No. 2,448,828), ⁇ -hydrocarbon substituted aromatics.
  • Group acyloin compounds described in US Pat. No. 2,722,512
  • polynuclear quinone compounds described in US Pat. Nos.
  • the content of the photopolymerization initiator in the liquid crystal composition is preferably 0.1 to 20% by mass, and preferably 0.5 to 5% by mass with respect to the content of the polymerizable liquid crystal compound. Further preferred.
  • the liquid crystal composition may optionally contain a crosslinking agent in order to improve the film strength after hardening and the durability.
  • a crosslinking agent one that can be cured by ultraviolet rays, heat, moisture, or the like can be suitably used.
  • a crosslinking agent there is no restriction
  • 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. When the content of the crosslinking agent is less than 3% by mass, the effect of improving the crosslinking density may not be obtained, and when it exceeds 20% by mass, the stability may be lowered.
  • an alignment control agent that contributes to stable or rapid planar alignment may be added.
  • the orientation 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) described in the 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 film thickness uniform, and various additives such as a polymerizable monomer.
  • a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a coloring material, metal oxide fine particles, and the like may be added within a range that does not deteriorate the optical performance. Can be added.
  • the solvent used for preparing the liquid crystal composition is not particularly limited and may be appropriately selected depending on the intended purpose, but an organic solvent is preferably used.
  • the organic solvent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include ketones, alkyl halides, amides, sulfoxides, heterocyclic compounds, hydrocarbons, esters and ethers. Can be 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 of applying the liquid crystal composition to the support or alignment film is not particularly limited and can be appropriately selected depending on the purpose.
  • the wire bar coating method, curtain coating method, extrusion coating method, direct gravure coating Method, reverse gravure coating method, die coating method, spin coating method, dip coating method, spray coating method and slide coating method 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. Nematic orientation is preferred.
  • the heating temperature is preferably 50 ° C. to 120 ° C., more preferably 60 ° C. to 100 ° C.
  • the aligned liquid crystal compound can be further polymerized to cure the liquid crystal composition.
  • the polymerization may be either thermal polymerization or photopolymerization by 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 using the IR (Infrared) absorption spectrum for the consumption ratio of the polymerizable functional group.
  • the thickness of the quarter-wave plate formed from the liquid crystal composition is not particularly limited, but is preferably 0.2 to 10 ⁇ m, more preferably 0.5 to 2 ⁇ m.
  • the liquid crystal composition may be applied to the support or the surface of the alignment layer formed on the support surface.
  • the support may be a temporary support that is peeled off after layer formation.
  • polyester such as polyethylene terephthalate (PET), polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, silicone, and glass plate.
  • the alignment layer has a rubbing treatment of organic compounds such as polymers (resins such as polyimide, polyvinyl alcohol, polyester, polyarylate, polyamideimide, polyetherimide, polyamide and modified polyamide), oblique deposition of inorganic compounds, and microgrooves. It can be provided by means such as layer formation or accumulation of organic compounds (eg, ⁇ -tricosanoic acid, dioctadecylmethylammonium chloride and methyl stearylate) by the Langmuir-Blodgett method (LB film). Further, 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.
  • organic compounds such as polymers (resins such as polyimide, polyvinyl alcohol, polyester, polyarylate, polyamideimide, polyetherimide, polyamide and modified polyamide), oblique deposition of inorganic compounds, and microgrooves. It can be provided
  • 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 several times in a certain direction with paper or cloth. You may apply
  • the thickness of the alignment layer is preferably 0.01 to 5 ⁇ m, more preferably 0.05 to 2 ⁇ m.
  • the front plate 22 a glass plate or a plastic plate used for manufacturing a normal mirror can be used.
  • the front plate 22 is preferably transparent in the visible light region and has a small birefringence.
  • the plastic plate include polyester such as polyethylene terephthalate (PET), polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, and silicone.
  • the film thickness of the front plate 22 may be about 100 ⁇ m to 10 mm, preferably 200 ⁇ m to 5 mm, and more preferably 500 ⁇ m to 2 mm.
  • a quarter-wave plate 23 is prepared, and a second adhesive layer 25 is formed on one surface of the quarter-wave plate 23.
  • the pressure-sensitive adhesive layer of the OCA sheet from which the release sheet on one side is peeled is attached to one side of the quarter-wave plate 23, and then the other side of the OCA sheet is peeled off. The sheet is peeled off, whereby the second adhesive layer 25 is formed.
  • the front plate 22 is affixed on the adhesive surface of the second adhesive layer 25.
  • the first adhesive layer 24 is formed on the front plate 22. Specifically, for example, the pressure-sensitive adhesive layer of the OCA sheet from which the release sheet on one side has been peeled is attached to the front plate 22, and then the release sheet on the other side of the OCA sheet is peeled off. A first adhesive layer 24 is formed.
  • the circularly polarized light reflecting portion 12 is formed by pasting the linearly polarized light reflecting layer 21 on the adhesive surface of the first adhesive layer 24.
  • the circularly polarized light reflecting portion 12 can be formed by bonding members wound in a roll shape, whereby a large area sheet-like circularly polarized light reflecting portion 12 can be formed.
  • the sheet-like circularly polarized light reflecting portion 12 formed in this way is cut in accordance with the shape of a final product such as a vehicle rearview mirror.
  • the circularly polarized light reflecting portion 12 cut into an appropriate shape is adhered to the image display surface 20a of the image display portion 20, whereby the vehicle image display function-equipped mirror 10 of the first embodiment is formed.
  • a protective function may be provided by performing a hard coat process on the surface of the circularly polarized light reflecting portion 12 opposite to the front plate 22 side of the quarter wavelength plate 23.
  • the method for forming the hard coat layer by the hard coat treatment is not particularly limited, and a known method can be used.
  • Examples of the method for forming the hard coat layer include vapor deposition such as coating or sputtering. Among them, coating is preferable, and a polyfunctional monomer or oligomer is included to obtain a certain hardness. It is desirable to apply a coating solution, and to harden after drying.
  • the coating solution is preferably prepared by dissolving and / or dispersing a material in a solvent.
  • various methods such as a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method can be employed.
  • the liquid crystal composition may be discharged from a nozzle using an inkjet apparatus to form a coating film.
  • the material used for forming the hard coat layer there are no particular restrictions on the material used for forming the hard coat layer.
  • various materials conventionally used as a material for the hard coat layer such as a polymer film (for example, a PET film) can be used.
  • the pencil hardness of the hard coat layer formed by the hard coat treatment is preferably 2H or more.
  • the hard coat layer composition preferably uses at least one bifunctional or higher polymerizable monomer as a main component. This is because the pencil hardness of the hard coat layer obtained after polymerization by light irradiation or heat is easily controlled to 2H or more.
  • the bifunctional or higher polymerizable monomer is preferably a bifunctional or higher (meth) acrylate.
  • the bifunctional or higher functional monomer means a monomer in which two or more polymerizable groups are contained in one monomer molecule.
  • the bifunctional or higher (meth) acrylate is preferably photopolymerizable. Moreover, according to the pencil hardness calculated
  • DPHA dipentaerythritol hexaacrylate
  • PETA pentaerythritol tetraacrylate
  • the hard coat layer composition further contains a monofunctional (meth) acrylate for the purpose of adjusting the viscosity at the time of coating and the pencil hardness after film formation. Also good.
  • the pencil hardness is measured by a method based on JIS K5400 (pencil scratch test method).
  • a protective plate 27 made of glass or plastic may be provided for the circularly polarized light reflecting portion 12 in the vehicle image display function-equipped mirror 10 of the first embodiment. That is, the protective plate 27 may be provided on the surface of the circularly polarized light reflecting portion 12 opposite to the front plate 22 side of the quarter wavelength plate 23.
  • polyester such as polyethylene terephthalate, polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, or silicone can be used.
  • the thickness of the protective plate 27 may be about 100 ⁇ m to 10 mm, preferably 200 ⁇ m to 5 mm, and more preferably 500 ⁇ m to 2 mm.
  • the protective plate 27 and the quarter-wave plate 23 are preferably bonded by a single adhesive layer 26, and may be bonded by, for example, an OCA sheet or PVB (polyvinyl butyral).
  • the vehicle image display function mirror 30 of the second embodiment is also used for the vehicle room mirror 2 shown in FIG. .
  • the present invention is not limited to this, and may be used for a side mirror or a mirror attached to another vehicle.
  • the second mirror 30 with an image display function for a vehicle receives an image display unit 20 that can display a captured image around the vehicle, and photographic image light displayed on the image display unit 20. And a circularly polarized light reflecting portion 13.
  • the second vehicle image display function-equipped mirror 30 is different from the first vehicle image display function-equipped mirror 10 in that the configuration of the circularly polarized light reflecting portion 13 is different.
  • the image display unit 20 is the same as that in the first embodiment.
  • the circularly polarized light reflection unit 13 is provided on the image display surface 20 a side of the image display unit 20 as in the circular polarization reflection unit 12 of the first embodiment.
  • the circularly polarized light reflecting portion 13 functions as a semi-transmissive and semireflective layer in the vehicle image display function-equipped mirror 30 of the second embodiment, similarly to the circularly polarized light reflecting portion 12 of the first embodiment. That is, when the captured image is displayed on the image display unit 20, the circularly polarized light reflection unit 13 transmits the emitted light (captured image light) from the image display unit 20, thereby providing a mirror with an image display function for vehicles. 10 so that a photographed image is displayed on the front surface.
  • the circularly polarized light reflection unit 13 receives incident light from the side opposite to the image display unit 20 side (from the arrow S direction side shown in FIG. 2). It reflects and functions so that the front surface of the mirror 30 with an image display function for vehicles becomes a mirror.
  • FIG. 6 is a sectional view taken along the line B-C of the vehicle image display function mirror 30 shown in FIG.
  • the circularly polarized light reflecting portion 13 includes a quarter-wave plate 31, a circularly polarized light reflecting layer 32, a front plate 33 made of glass or plastic, and a high retardation plate 34.
  • the circularly polarized light reflecting layer 32 corresponds to a dichroic polarized light reflecting layer
  • the high retardation plate 34 corresponds to an optical compensation layer.
  • the quarter wavelength plate 31, the circularly polarized reflection layer 32, the front plate 33, and the high retardation plate 34 are arranged in this order from the image display unit 20 side. That is, the quarter-wave plate 31 and the circularly polarizing reflection layer 32 are disposed on the image display unit 20 side with respect to the front plate 33, and the high phase difference plate 34 is disposed on the opposite side of the image display unit 20 with respect to the front plate 22. Has been placed.
  • the circularly polarized light reflecting portion 13 functions as a semi-transmissive and semi-reflective layer, but the mirror surface is formed on the surface 32a of the circularly polarized light reflecting layer 32 on the front plate 33 side, as shown in FIG.
  • the quarter-wave plate 31 and the circularly polarizing reflection layer 32 and the front plate 33 are bonded by a single first adhesive layer 35, and the front plate 33 and the high retardation plate 34 are a single layer second adhesive. Bonded by layer 36.
  • the adhesion by the single first adhesive layer 35 or the second adhesive layer 36 means that between the quarter wave plate 31 and the circularly polarized light reflecting layer 32 and the front plate 33 or the front plate 33. It means that only one adhesive layer is disposed between the high retardation plate 34 and no adhesive layer other than the first adhesive layer 35 or the second adhesive layer 36.
  • the first adhesive layer 35 itself and the second adhesive layer 36 itself may be formed of a plurality of layers.
  • the laminated body of the quarter-wave plate 31 and the circularly polarized light reflection layer 32 and the front plate 33 are bonded by the single first adhesive layer 35, and the front Since the high phase difference plate 34 is arranged on the side opposite to the image display unit 20 side with respect to the face plate 33, a clear image and mirror reflection can be obtained without direction dependency even when the user uses polarized sunglasses or the like. The image can be visually recognized, and the distortion of the reflected image can be suppressed. Further, since the front plate 33 and the high retardation plate 34 are also bonded by the single second adhesive layer 36, distortion of the reflected image can be further suppressed. The operational effects of the high retardation plate 34 will be described in detail later.
  • the thickness of the first adhesive layer 35 and the second adhesive layer 36 is preferably 10 ⁇ m or more and 25 ⁇ m or less. The reason is the same as in the first embodiment.
  • the image display unit 20 and the quarter wavelength plate 31 may be directly bonded.
  • other layers such as an adhesive layer may be included between the quarter-wave plate 31 and the circularly-polarized reflective layer 32, the quarter-wave plate 31 and the circularly-polarized reflective layer 32 are directly connected to each other. It is preferable to contact.
  • the quarter wavelength plate 31 and the circularly polarized light reflection layer 32 are laminated with the same area.
  • the angle of the quarter-wave plate 31 is preferably adjusted so that the image is brightest. That is, the polarization direction (transmission axis) of the linearly polarized light and the slow axis of the quarter-wave plate 31 so that the linearly polarized light is transmitted best with respect to the image display unit 20 that displays an image with linearly polarized light. It is preferable that the relationship is adjusted. For example, in the case of a single layer type quarter wave plate 31, it is preferable that the transmission axis and the slow axis form an angle of 45 °.
  • the light emitted from the image display unit 20 displaying an image by linearly polarized light is circularly polarized light of either right or left sense after passing through the quarter wavelength plate 31.
  • the circularly polarized light reflecting layer 32 to be described later is preferably composed of a cholesteric liquid crystal layer having a twist direction that transmits the circularly polarized light having the above-described sense.
  • the light from the image display unit 20 is circularly polarized by including the quarter wavelength plate 31 between the image display unit 20 and the circularly polarized reflection layer 32. And can be made incident on the circularly polarized light reflecting layer 32. Therefore, the light reflected by the circularly polarized light reflection layer 32 and returning to the image display unit 20 side can be greatly reduced, and a bright image can be displayed.
  • “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 the irradiated light is greater than 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.
  • the degree of circular polarization is a value represented by
  • the term “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 selective reflection by the cholesteric liquid crystal reflects right circularly polarized light when the twist direction (sense) of the cholesteric liquid crystal spiral is right, transmits left circularly polarized light, and reflects left circularly polarized light when the sense is left, Transmits circularly polarized light.
  • the quarter-wave plate 31 may be a retardation layer that functions as a quarter-wave plate in the visible light region.
  • Examples of the quarter-wave plate 31 include a single-layer quarter-wave plate, a broadband quarter-wave plate in which a quarter-wave plate and a half-wave retardation plate are stacked, and the like.
  • the front phase difference of the former 1 ⁇ 4 wavelength plate may be a length that is 1 ⁇ 4 of the emission wavelength of the image display unit 20.
  • the phase difference is 112.5 nm ⁇ 10 nm, preferably 112.5 nm ⁇ 5 nm, more preferably 112.5 nm at the wavelength of 450 nm, A phase difference of 132.5 nm ⁇ 10 nm, preferably 132.5 nm ⁇ 5 nm, more preferably 132.5 nm at a wavelength of 530 nm, and 160 nm ⁇ 10 nm, preferably 160 nm ⁇ 5 nm, more preferably 160 nm at a wavelength of 640 nm.
  • a reverse dispersion retardation layer that is a phase difference as a quarter-wave plate, but a retardation plate having a small retardation wavelength dispersion or a forward dispersion retardation plate can also be used.
  • the reverse dispersion means a property that the absolute value of the phase difference becomes larger as the wavelength becomes longer
  • the forward dispersion means a property that the absolute value of the phase difference becomes larger as the wavelength becomes shorter.
  • the laminated quarter-wave plate is formed by laminating a quarter-wave plate and a half-wave retardation plate at an angle of 60 ° with the slow axis, and the side of the half-wave retardation plate is linearly polarized. It is arranged on the incident side, and the slow axis of the half-wave retardation plate is used so as to intersect 15 ° or 75 ° with respect to the polarization plane of the incident linearly polarized light. Can be suitably used because of its good resistance.
  • the phase difference means frontal retardation.
  • the phase difference can be measured using a polarization phase difference analyzer AxoScan manufactured by AXOMETRICS. Alternatively, measurement may be performed by making light of a specific wavelength incident in the normal direction of the film in KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments).
  • a quartz plate for example, a stretched polycarbonate film, a stretched norbornene polymer film, a transparent film oriented containing inorganic particles having birefringence such as strontium carbonate, and an inorganic dielectric obliquely on a support
  • a deposited thin film for example, a quartz plate, a stretched polycarbonate film, a stretched norbornene polymer film, a transparent film oriented containing inorganic particles having birefringence such as strontium carbonate, and an inorganic dielectric obliquely on a support
  • a deposited thin film for example, a deposited thin film.
  • the quarter wavelength plate 31 the one exemplified as the quarter wavelength plate 23 of the circularly polarized light reflecting portion 12 of the first embodiment can be used.
  • the circularly polarized light reflection layer 32 includes at least one cholesteric liquid crystal layer exhibiting selective reflection in the visible light region.
  • the circularly polarized light reflecting layer 32 may include two or more cholesteric liquid crystal layers, and may include other layers such as an alignment layer.
  • the circularly polarized light reflecting layer 32 is preferably composed only of a cholesteric liquid crystal layer.
  • the circularly polarized light reflection layer 32 includes a plurality of cholesteric liquid crystal layers, it is preferable that they are in direct contact with the adjacent cholesteric liquid crystal layers.
  • the circularly polarized light reflection layer 32 preferably includes three or more cholesteric liquid crystal layers such as three layers and four layers.
  • the film thickness of the circularly polarized light reflecting layer 32 is preferably 2.0 ⁇ m to 300 ⁇ m, more preferably 8.0 to 200 ⁇ m.
  • the 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 phase selectively reflects the circularly polarized light of either the right circularly polarized light or the left circularly polarized light in a specific wavelength range and exhibits circularly polarized light selective reflection that 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 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 polymerizable liquid crystal compound may have a high molecular weight due to a curing reaction and may no longer have liquid crystallinity.
  • 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 center wavelength of selective reflection means the center wavelength when 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 center wavelength ⁇ can be adjusted in order to selectively reflect either the right circularly polarized light or the left circularly polarized light with respect to light of a desired wavelength by adjusting the n value and the P value.
  • n ⁇ P n 1 ⁇ P ⁇ cos ⁇ 1
  • the mirror with an image display function of the present invention may give a color to the display image and the reflected image viewed from an oblique direction.
  • a cholesteric liquid crystal layer having a center wavelength of selective reflection in the infrared light region in the circularly polarized light reflecting layer it is possible to prevent this color.
  • the center wavelength of selective reflection in the infrared region is specifically 780 to 900 nm, preferably 780 to 850 nm.
  • 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, a desired pitch can be obtained by adjusting these.
  • a desired pitch can be obtained by adjusting these.
  • the circularly polarized light reflecting layer 32 is selected for a cholesteric liquid crystal layer having a central wavelength of selective reflection in the wavelength range of red light, a cholesteric liquid crystal layer having a central wavelength of selective reflection in the wavelength range of green light, and a wavelength range of blue light. And a cholesteric liquid crystal layer having a central wavelength of reflection.
  • the circularly polarized light reflecting layer 32 has, for example, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 400 nm to 500 nm, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 500 nm to 580 nm, and a central wavelength of selective reflection at 580 nm to 700 nm.
  • cholesteric liquid crystal layer it is preferable to include a cholesteric liquid crystal layer. Further, when the circularly polarized light reflection layer includes a plurality of cholesteric liquid crystal layers, it is preferable that the cholesteric liquid crystal layer closer to the image display unit 20 has a longer selective reflection center wavelength. With such a configuration, it is possible to suppress oblique color in the display image and the reflected image.
  • a bright image can be displayed with high light utilization efficiency.
  • Examples of usage of the circularly polarized light reflecting layer 32 include an incident angle of light to the circularly polarized light reflecting layer 32 and an image observation direction.
  • Sense of reflected circularly polarized light in the cholesteric liquid crystal layer matches the sense of spiral.
  • Each cholesteric liquid crystal layer has either a right or left spiral sense depending on the sense of circularly polarized light sensed from the image display unit 20 and transmitted through the quarter-wave plate 31.
  • Some cholesteric liquid crystal layer is used.
  • a cholesteric liquid crystal layer having a spiral sense that transmits the circularly polarized light of the sense obtained from the image display unit 20 and transmitted through the quarter-wave plate 31 may be used.
  • the circularly polarized light reflecting layer 32 includes a plurality of cholesteric liquid crystal layers, it is preferable that the senses of the spirals are all the same.
  • ⁇ n can be adjusted by adjusting the kind of the polymerizable liquid crystal compound and the mixing ratio thereof, or by controlling the temperature at the time of fixing the alignment.
  • a plurality of cholesteric liquid crystal layers having the same period P and the same spiral sense may be stacked. By laminating cholesteric liquid crystal layers having the same period P and the same spiral sense, the circularly polarized light selectivity can be increased at a specific wavelength.
  • the material used for forming the quarter-wave plate 31 examples include a liquid crystal composition containing a polymerizable liquid crystal compound.
  • the material used for forming the cholesteric liquid crystal layer preferably further contains a chiral agent (optically active compound).
  • a cholesteric liquid crystal layer as a support, a temporary support, an alignment film, a quarter-wave plate, or a lower layer, which is mixed with a surfactant or a polymerization initiator as necessary and dissolved in a solvent. After ripening the alignment, it can be fixed by curing the liquid crystal composition to form a cholesteric liquid crystal layer.
  • the cholesteric liquid crystal layer can be formed by applying to a support, a temporary support, an alignment film, or a lower cholesteric liquid crystal layer, and fixing the liquid crystal composition after the alignment aging.
  • a rod-like liquid crystal compound may be used as the polymerizable liquid crystal compound.
  • the rod-like polymerizable liquid crystal compound include a rod-like nematic liquid crystal compound.
  • rod-like nematic liquid crystal compounds 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. Examples of polymerizable liquid crystal compounds are described in Makromol. Chem. , 190, 2255 (1989), Advanced Materials, 107 (1993), U.S. Pat. Nos.
  • 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.
  • the material used for forming the cholesteric liquid crystal layer preferably contains a chiral agent.
  • 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.
  • the chiral agent is not particularly limited, and is a known compound (for example, liquid crystal device handbook, Chapter 3, Section 4-3, TN, chiral agent for STN, 199 pages, Japan Society for the Promotion of Science, 142nd Committee, 1989. ), Isosorbide and isomannide derivatives can be used.
  • 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.
  • the chiral agent has a photoisomerizable group because a pattern having a desired reflection wavelength corresponding to the emission wavelength can be formed by photomask irradiation such as actinic rays after coating and orientation.
  • a photoisomerization group the isomerization part of the compound which shows photochromic property, an azo, an azoxy, and a cinnamoyl group are preferable.
  • Specific examples of the compound include JP2002-80478, JP200280851, JP2002-179668, JP2002-179669, JP2002-179670, and JP2002.
  • 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 the specifications of US Pat. Nos. 2,367,661 and 2,367,670), acyloin A Tell (U.S. Pat. No. 2,448,828), ⁇ -hydrocarbon substituted aromatic acyloin compound (U.S. Pat. No. 2,722,512), polynuclear quinone compound (U.S. Pat. Nos.
  • the content of the photopolymerization initiator in the liquid crystal composition is preferably 0.1 to 20% by mass, and preferably 0.5 to 5% by mass with respect to the content of the polymerizable liquid crystal compound. Further preferred.
  • the liquid crystal composition may optionally contain a crosslinking agent in order to improve the film strength after hardening and the durability.
  • a crosslinking agent those that are cured by ultraviolet rays, heat, moisture, or the like can be suitably used.
  • a crosslinking agent there is no restriction
  • 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. When the content of the crosslinking agent is less than 3% by mass, the effect of improving the crosslinking density may not be obtained. When the content exceeds 20% by mass, the stability of the formed layer may be lowered. .
  • an alignment control agent that contributes to stable or rapid planar alignment may be added.
  • the orientation 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 further contain at least one selected from various additives such as a surfactant for adjusting the surface tension of the coating film and making the film thickness uniform, and a polymerizable monomer. Good. Further, in the liquid crystal composition, a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a coloring material, metal oxide fine particles, and the like are added in a range that does not deteriorate the optical performance, if necessary. Can be added.
  • various additives such as a surfactant for adjusting the surface tension of the coating film and making the film thickness uniform, and a polymerizable monomer. Good.
  • a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a coloring material, metal oxide fine particles, and the like are added in a range that does not deteriorate the optical performance, if necessary. Can be added.
  • the solvent used for preparing the liquid crystal composition is not particularly limited and may be appropriately selected depending on the intended purpose, but an organic solvent is preferably used.
  • the organic solvent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include ketones, alkyl halides, amides, sulfoxides, heterocyclic compounds, hydrocarbons, esters, and ethers. 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 of applying the liquid crystal composition to the temporary support, the alignment film, the quarter wavelength plate, or the cholesteric liquid crystal layer as the lower layer is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include a bar coating method, a curtain coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, a die coating method, a spin coating method, a dip coating method, a spray coating method, and a slide coating method. 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.
  • cholesteric alignment may be performed, and in forming the quarter-wave plate, nematic alignment is preferable.
  • the heating temperature is preferably 200 ° C. or lower, and more preferably 130 ° C. or lower.
  • the heating temperature is preferably 50 ° C. to 120 ° C., more preferably 60 ° C. to 100 ° C.
  • the aligned liquid crystal compound can be further polymerized to cure the liquid crystal composition.
  • the polymerization may be either thermal polymerization or photopolymerization by light irradiation, but photopolymerization is preferred. It is preferable to use ultraviolet rays for light irradiation.
  • the irradiation energy is preferably 20 mJ / cm 2 to 50 J / cm 2. More preferably, 100 mJ / cm 2 to 1,500 mJ / 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 determine the consumption rate of a polymerizable functional group using an IR absorption spectrum.
  • each cholesteric liquid crystal layer is not particularly limited as long as it exhibits the above characteristics, but it is preferably in the range of 1.0 to 150 ⁇ m, more preferably in the range of 4.0 to 100 ⁇ m.
  • the thickness of the quarter-wave plate formed from the liquid crystal composition is not particularly limited, but is preferably 0.2 to 10 ⁇ m, more preferably 0.5 to 2 ⁇ m.
  • the liquid crystal composition may be applied to the surface of the temporary support or the alignment layer formed on the surface of the temporary support to form a layer.
  • the temporary support or the temporary support and the alignment layer may be peeled off after forming the layer.
  • a support may be used particularly when forming a quarter wavelength plate. The support does not have to be peeled off after forming the layer.
  • the temporary support and the support include polyester such as polyethylene terephthalate (PET), polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, silicone, or glass plate.
  • the alignment layer is formed by rubbing treatment of organic compounds such as polymers (resins such as polyimide, polyvinyl alcohol, polyester, polyarylate, polyamideimide, polyetherimide, polyamide, and modified polyamide), oblique deposition of inorganic compounds, and microgrooves. Or by accumulating organic compounds (for example, ⁇ -tricosanoic acid, dioctadecylmethylammonium chloride, methyl stearylate) by the Langmuir-Blodgett method (LB film). . Further, 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.
  • organic compounds such as polymers (resins such as polyimide, polyvinyl alcohol, polyester, polyarylate, polyamideimide, polyetherimide, polyamide, and modified polyamide), oblique deposition of inorganic compounds, and microgrooves. Or by accumulating organic compounds (
  • 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 several times in a certain direction with paper or cloth.
  • the liquid crystal composition may be applied to the surface of the temporary support without providing the alignment layer, or the surface obtained by rubbing the temporary support.
  • the thickness of the alignment layer is preferably 0.01 to 5 ⁇ m, more preferably 0.05 to 2 ⁇ m.
  • the quarter-wave plate 31 and the cholesteric liquid crystal layer are composed of 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.
  • the product is applied onto a temporary support, an alignment layer, a quarter-wave plate, or a cholesteric liquid crystal layer previously prepared, and dried to obtain a coating film. It can be formed by orienting the compound and then polymerizing the polymerizable compound to fix the orientation.
  • a laminate of layers formed from a polymerizable liquid crystal compound can be formed by repeating the above steps. Alternatively, a part of the layers or a part of the stacked films may be separately manufactured and bonded together with an adhesive layer.
  • liquid crystal composition containing a polymerizable liquid crystal compound or the like may be directly applied to the surface of the / 4 wavelength plate 31 or the previous cholesteric liquid crystal layer, and the alignment and fixing steps may be repeated.
  • the liquid crystal on the air interface side of the cholesteric liquid crystal layer formed earlier is formed by forming the next cholesteric liquid crystal layer so as to be in direct contact with the surface of the cholesteric liquid crystal layer formed earlier.
  • the alignment orientation of the molecules coincides with the orientation orientation of the liquid crystal molecules below the cholesteric liquid crystal layer formed thereon, and the polarization property of the laminate of the cholesteric liquid crystal layer is improved.
  • the high phase difference plate 34 means a plate having a front phase difference of 5000 nm or more.
  • the front retardation of the high retardation plate 34 is preferably 6000 nm or more, and more preferably 8000 nm or more.
  • the front retardation of the high retardation plate 34 is preferably as large as possible, but may be 100000 nm or less, 50000 nm or less, 40000 nm or less, or 30000 nm or less in consideration of manufacturing efficiency and thinning.
  • the high phase difference plate 34 and the quarter wavelength plate having a high front phase difference as described above may cause the polarized light generated when sunlight passes through the vehicle window glass (particularly the rear glass) to be pseudo-non-polarized. it can.
  • the front phase difference that can make the polarized light pseudo-non-polarized is described in paragraphs ⁇ 0022> to ⁇ 0033> of JP-A-2005-321544.
  • the specific numerical value of the front phase difference can be determined according to the vehicle using the vehicle image display function-equipped mirror 30 of the present embodiment. In particular, it may be determined according to the magnitude of the front phase difference generated in the sunlight transmitted through the rear glass of the vehicle.
  • tempered glass for example, tempered glass that is not a laminated glass
  • vehicle window glass particularly rear glass
  • tempered glass has a birefringence distribution.
  • the tempered glass is generally produced by heating a float plate glass to 700 ° C. near the softening point, and then rapidly cooling the glass surface by blowing air. This treatment lowers the temperature of the glass surface first and shrinks and solidifies, while the glass interior is slower to cool down than the surface and delays shrinking, resulting in stress distribution inside and no birefringence. Even when float glass is used, birefringence distribution occurs in the tempered glass.
  • the light incident on the front surface of the mirror with an image display function for vehicles that passes through the rear glass of the vehicle in which the tempered glass produced as described above is used particularly causes the above-described unevenness in the reflected image.
  • a polarization component with a distribution is generated in the light incident on the front surface of the mirror with an image display function for a vehicle due to the birefringence distribution, the reflected light on the front surface of the mirror with the image display function for a vehicle and the selection in the circularly polarized light reflection layer 32
  • a difference in the intensity of the reflected light occurs due to the interference with the reflected light, causing the unevenness of the reflected image.
  • the light incident on the front surface of the mirror 30 with a vehicle image display function is reflected by circularly polarized light by using the high retardation plate 34 having a predetermined phase difference. It is presumed that unevenness can be reduced by making the light non-polarized before entering the layer 32 in a pseudo manner.
  • a birefringent material such as a plastic film and a quartz plate
  • the plastic include polyester films such as polyethylene terephthalate (PET), polycarbonate films, polyacetal films, and polyarylate films.
  • JP, 2013-257579, A JP, 2015-102636, A, etc. can be referred to for a phase contrast layer which has PET and has a high phase contrast as a main component.
  • a commercially available product such as an optical Cosmo Shine (registered trademark) super birefringence type (manufactured by Toyobo Co., Ltd.) may be used.
  • a plastic film having a high phase difference is generally formed by forming a film by melting and extruding a resin, casting it on a drum, etc., and stretching it uniaxially or biaxially 2 to 5 times while heating it. It can be formed by stretching at a magnification. Further, for the purpose of promoting crystallization and increasing the strength of the film, a heat treatment called “heat setting” may be performed at a temperature exceeding the stretching temperature after stretching.
  • a quarter wavelength plate may be provided instead of the high retardation plate 34.
  • the quarter wavelength plate can also eliminate the polarization caused by the sunlight passing through the vehicle window glass.
  • the 1/4 wavelength plate has a function of substantially shifting the phase of the reflected light by ⁇ ⁇ / 4.
  • the front phase difference at a wavelength of 550 nm may be 138 nm ⁇ 10 nm, preferably 138 nm ⁇ 5 nm.
  • the phase of incident light with different polarization states can be shifted to a region where the difference in intensity of reflected light is unlikely to occur. It is estimated that the unevenness of the reflected image can be reduced.
  • 1/4 retardation plate used instead of the high retardation plate 34 may be the same as the 1/4 wavelength plate 23 and the 1/4 wavelength plate 31 described above.
  • the high retardation plate described above may be provided in the vehicle image display function mirror 10 of the first embodiment.
  • the high retardation plate 28 has an image display unit 20 with respect to the front plate 22 of the circularly polarized light reflection unit 12 in the mirror 10 with an image display function for a vehicle of the first embodiment. It may be provided on the side opposite to the side.
  • the stacking order of the quarter wavelength plate 23 and the high retardation plate 28 may be the order of the high retardation plate 28 and the quarter wavelength plate 23 from the image display unit 20 side, or conversely from the image display unit 20 side.
  • the order of the quarter wavelength plate 23 and the high retardation plate 28 may be in this order, considering that the polarization conversion accuracy by the quarter wavelength plate 23 is high and is not easily affected by the phase difference deviation by the high retardation plate 28, As shown in FIG. 7, the high retardation plate 28 and the quarter wavelength plate 23 are preferably arranged in this order from the image display unit 20 side. In this case as well, the front plate 22 and the high retardation plate 28 are preferably bonded by a single adhesive layer such as an OCA sheet.
  • the above-described high retardation plate may be provided instead of the quarter-wave plate 23 in the vehicle image display function-equipped mirror 10 of the first embodiment.
  • the above-described high retardation plate may be provided instead of the quarter-wave plate 23 in the vehicle image display function-equipped mirror 10 of the first embodiment.
  • a high retardation plate 34 is prepared, and a second adhesive layer 36 is formed on one surface of the high retardation plate 34.
  • the pressure-sensitive adhesive layer of the OCA sheet from which the release sheet on one side is peeled is attached to one side of the high retardation plate 34, and then the release sheet on the other side of the OCA sheet is It peels and the 2nd adhesion layer 36 is formed by this.
  • the front plate 33 is affixed on the adhesive surface of the second adhesive layer 36.
  • the first adhesive layer 35 is formed on the front plate 33. Specifically, for example, the pressure-sensitive adhesive layer of the OCA sheet from which the release sheet on one side is peeled is attached to the front plate 33, and then the release sheet on the other side of the OCA sheet is peeled off. A first adhesive layer 35 is formed.
  • the circularly polarized light reflecting portion 13 is formed by affixing the laminated body of the circularly polarized light reflecting layer 32 and the quarter wavelength plate 31 on the adhesive surface of the first adhesive layer 35.
  • the circularly polarized light reflecting portion 13 can be formed by bonding members wound in a roll shape, whereby a large area sheet-like circularly polarized light reflecting portion 13 can be formed.
  • the sheet-like circularly polarized light reflecting portion 13 formed in this way is cut in accordance with the shape of the final product such as a vehicle rearview mirror.
  • the circularly polarized light reflecting portion 13 cut into an appropriate shape is adhered to the image display surface 20a of the image display portion 20, whereby the vehicle image display function-equipped mirror 10 of the first embodiment is formed.
  • a protective function may be provided by performing a hard coat process on the surface of the circularly polarized light reflecting portion 13 opposite to the front plate 33 side of the high retardation plate 34.
  • the method for forming the hard coat layer by the hard coat treatment is not particularly limited, and a known method can be used.
  • Examples of the method for forming the hard coat layer include vapor deposition such as coating or sputtering. Among them, coating is preferable, and a polyfunctional monomer or oligomer is included to obtain a certain hardness. It is desirable to apply a coating solution, and to harden after drying.
  • the coating solution is preferably prepared by dissolving and / or dispersing a material in a solvent.
  • various methods such as a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method can be employed.
  • the liquid crystal composition may be discharged from a nozzle using an inkjet apparatus to form a coating film.
  • the material used for forming the hard coat layer there are no particular restrictions on the material used for forming the hard coat layer.
  • various materials conventionally used as a material for the hard coat layer such as a polymer film (for example, a PET film) can be used.
  • the pencil hardness of the hard coat layer formed by the hard coat treatment is preferably 2H or more.
  • the hard coat layer composition preferably uses at least one bifunctional or higher polymerizable monomer as a main component. This is because the pencil hardness of the hard coat layer obtained after polymerization by light irradiation or heat is easily controlled to 2H or more.
  • the bifunctional or higher polymerizable monomer is preferably a bifunctional or higher (meth) acrylate.
  • the bifunctional or higher functional monomer means a monomer in which two or more polymerizable groups are contained in one monomer molecule.
  • the bifunctional or higher (meth) acrylate is preferably photopolymerizable. Moreover, according to the pencil hardness calculated
  • DPHA dipentaerythritol hexaacrylate
  • PETA pentaerythritol tetraacrylate
  • the hard coat layer composition further contains a monofunctional (meth) acrylate for the purpose of adjusting the viscosity at the time of coating and the pencil hardness after film formation. Also good.
  • the pencil hardness is measured by a method based on JIS K5400 (pencil scratch test method).
  • a protective plate 38 made of glass or plastic may be provided for the circularly polarized light reflecting portion 13 in the vehicle image display function-equipped mirror 30 of the second embodiment. That is, the protective plate 38 may be provided on the surface of the circularly polarized light reflecting portion 13 opposite to the front plate 33 side of the high retardation plate 34.
  • a plastic plate polyester such as polyethylene terephthalate, polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, or silicone can be used.
  • the thickness of the protective plate 38 may be about 100 ⁇ m to 10 mm, preferably 200 ⁇ m to 2 mm, and more preferably 500 ⁇ m to 2 mm.
  • the protective plate 38 and the high retardation plate 34 are preferably bonded by a single-layer adhesive layer 37, and may be bonded by, for example, an OCA sheet or PVB (polyvinyl butyral).
  • the orange peel state refers to the front side (the side opposite to the image display unit side, arrow S shown in FIG. Is the result of evaluating the state of the orange peel when viewed from the direction), A is the state where the orange peel is most inconspicuous, then the size of the orange peel gradually increases in the order of B, C and D , D is the most noticeable orange peel.
  • a to C are within the allowable range.
  • the evaluation of the state of the orange peel was performed by a sensory test.
  • the ease of handling is the result of evaluating the ease of handling when OCA sheets are used as the first adhesive layer and the second adhesive layer. It is the result of evaluating the amount of the adhesive remaining on the release sheet as ease of handling when the release sheet is peeled off. It is assumed that A has the smallest remaining amount, and then the remaining amount increases in the order of B and C. Here, it is assumed that A to C are within the allowable range. Evaluation of the residual amount of the adhesive was performed by a sensory test.
  • the thicknesses of the first adhesive layer and the second adhesive layer are measured by a multilayer film thickness measuring instrument SI-T series manufactured by Keyence Corporation.
  • Example 1 is one example of the vehicle image display function-equipped mirror 10 of the first embodiment, and has a laminated structure as shown in FIG. That is, the linearly polarized light reflection layer 21 is formed on the image display unit 20 side with respect to the front plate 22 and the quarter wavelength plate 23 is formed on the opposite side to the image display unit 20 side.
  • the linearly polarized light reflecting layer 21 a layer prepared by adjusting the thickness of each layer so that the polarization control wavelength region is 580 nm to 720 nm based on the method described in JP-A-9-506837 was used.
  • the quarter-wave plate a pure ace manufactured by Teijin Limited was used, and a glass plate having a thickness of 1.8 mm was used as the front plate.
  • an OCA sheet having a thickness of 15 ⁇ m (81 series (manufactured by 3M Japan)) is used, and as the second adhesive layer 25, an OCA sheet having a thickness of 50 ⁇ m (81 series (3M Japan) is used. ))).
  • the image display unit 20 a 10-inch IPS type display device (emission peak wavelength is 450 nm (B (Blue)), 540 nm (G (Green)) ) And 630 nm (R (Red))).
  • Example 1 The state of the orange peel of the mirror with a vehicle image display function produced in Example 1 was A, and the ease of handling was also A.
  • Example 2 a mirror with an image display function for a vehicle was produced in the same manner as in Example 1 except that an OCA sheet having a thickness of 10 ⁇ m was used as the first adhesive layer 24 and the second adhesive layer 25. .
  • Example 2 The state of the orange peel of the mirror with a vehicle image display function produced in Example 2 was A, and the ease of handling was B.
  • Example 3 a mirror with an image display function for a vehicle was produced in the same manner as in Example 1 except that an OCA sheet having a thickness of 5 ⁇ m was used as the first adhesive layer 24 and the second adhesive layer 25. .
  • Example 4 a mirror with an image display function for a vehicle was manufactured in the same manner as in Example 1 except that 25 ⁇ m thick OCA sheets were used as the first adhesive layer 24 and the second adhesive layer 25. .
  • Example 4 The state of the orange peel of the mirror with a vehicle image display function produced in Example 4 was B, and the ease of handling was A.
  • Example 5 a mirror with an image display function for a vehicle was produced in the same manner as in Example 1 except that 50 ⁇ m-thick OCA sheets were used as the first adhesive layer 24 and the second adhesive layer 25. .
  • Example 5 The state of the orange peel of the mirror with a vehicle image display function produced in Example 5 was C, and the ease of handling was A.
  • Example 6 a mirror with an image display function for a vehicle was produced in the same manner as in Example 1 except that 100 ⁇ m thick OCA sheets were used as the first adhesive layer 24 and the second adhesive layer 25. .
  • the state of the orange peel of the vehicle image display function mirror produced in Example 6 was C, and the handling ease was A.
  • the seventh embodiment has a vehicle image display function in the same manner as the first embodiment except that the protective plate 27 is attached to the quarter-wave plate 23 using an OCA sheet. A mirror was produced.
  • the protection plate 27 a glass plate having a thickness of 0.75 mm was used.
  • the state of the orange peel of the vehicle image display function-equipped mirror produced in Example 7 was A, and the ease of handling was A.
  • Example 8 is an example of the vehicle image display function-equipped mirror 30 of the second embodiment, and has a stacked configuration as shown in FIG. That is, a laminated body of the quarter wavelength plate 31 and the circularly polarized light reflection layer 32 is formed on the image display unit 20 side with respect to the front plate 33, and the high retardation plate 34 is formed on the opposite side to the image display unit 20 side. The configuration.
  • the said compound 1, the compound 2, the fluorine-type horizontal alignment agents 1 and 2, a chiral agent, a polymerization initiator, and solvent methyl ethyl ketone were mixed, and the coating liquid of the following composition was prepared.
  • Coating liquids (R1), (R4) and (R7) were prepared by adjusting the formulation amount of the chiral agent LC-756 in the mixture (R). Using each coating solution, a single layer of cholesteric liquid crystal layer was prepared on the temporary support in the same manner as in the preparation of the following circularly polarized reflective layer, and the reflection characteristics were confirmed. It was a circularly polarized light reflection layer, and the center reflection wavelength was as shown in Table 2 below.
  • a laminate of a quarter-wave plate and a circularly polarizing reflection layer was prepared according to the following procedure.
  • a temporary support a PET film manufactured by Fuji Film Co., Ltd. (no undercoat layer, thickness: 75 ⁇ m) was rubbed and used.
  • the liquid crystalline mixture (X) was applied to the rubbing treated surface of the temporary support at room temperature using a wire bar so that the thickness of the dried film was 2.0 ⁇ m. After drying at room temperature for 30 seconds to remove the solvent, the mixture was heated in an atmosphere of 125 ° C. for 2 minutes, and then nematic liquid crystal phase was obtained at 85 ° C.
  • UV irradiation was performed for 6 to 12 seconds at an output of 60% with an electrodeless lamp “D bulb” (90 mW / cm 2) manufactured by Fusion UV Systems Co., Ltd., and a nematic liquid crystal phase was fixed to obtain a quarter wavelength plate. It was.
  • the coating solution (R1) of the first layer shown in Table 2 is applied to the quarter-wave plate surface at room temperature so that the thickness of the dried film becomes 4.0 ⁇ m. Applied.
  • the cholesteric liquid crystal layer was prepared by fixing the cholesteric liquid crystal phase by irradiating with UV light at 60% output for 6 to 12 seconds with an electrodeless lamp “D bulb” (90 mW / cm 2) manufactured by Fusion UV Systems Co., Ltd. And cooled to room temperature.
  • the second layer coating solution (R4) shown in Table 2 was applied to the surface of the obtained cholesteric liquid crystal layer, and the above steps (2) and (3) were repeated.
  • the third-layer coating liquid (R7) shown in Table 2 was applied to the surface of the obtained second-layer cholesteric liquid crystal, and the above steps (2) and (3) were repeated to form a quarter-wave plate.
  • a circularly polarized light reflecting layer having three cholesteric liquid crystal layers was formed.
  • the high retardation plate 34 an optical Cosmoshine (registered trademark) super birefringence type (manufactured by Toyobo Co., Ltd.) was used, and as the front plate 33, a glass plate having a thickness of 1.8 mm was used.
  • the first adhesive layer 35 an OCA sheet having a thickness of 15 ⁇ m (81 series (manufactured by 3M Japan)) is used, and as the second adhesive layer 36, an OCA sheet having a thickness of 50 ⁇ m (81 series (3M Japan) is used. ))).
  • a 10-inch IPS type display device emission peak wavelengths are 450 nm (B (Blue)), 540 nm (G (Green)), and 630 nm (R (Red)) was used.
  • Example 8 The state of the orange peel of the mirror with a vehicle image display function produced in Example 8 was A, and the ease of handling was also A.
  • Example 9 a mirror with an image display function for a vehicle was produced in the same manner as in Example 8 except that 10 ⁇ m thick OCA sheets were used as the first adhesive layer 35 and the second adhesive layer 36. .
  • the state of the orange peel of the vehicle image display function mirror produced in Example 9 was A, and the ease of handling was B.
  • Example 10 a mirror with an image display function for a vehicle was produced in the same manner as in Example 8 except that an OCA sheet having a thickness of 5 ⁇ m was used as the first adhesive layer 35 and the second adhesive layer 36. .
  • Example 11 In Example 11, a mirror with an image display function for a vehicle was produced in the same manner as in Example 8 except that an OCA sheet having a thickness of 25 ⁇ m was used as the first adhesive layer 35 and the second adhesive layer 36. .
  • the state of the orange peel of the vehicle image display function-made mirror produced in Example 11 was B, and the ease of handling was A.
  • Example 12 a mirror with an image display function for a vehicle was produced in the same manner as in Example 1 except that 50 ⁇ m-thick OCA sheets were used as the first adhesive layer 35 and the second adhesive layer 36. .
  • the state of the orange peel of the vehicle image display function mirror produced in Example 12 was C, and the ease of handling was A.
  • Example 13 a mirror with an image display function for a vehicle was produced in the same manner as in Example 8 except that an OCA sheet having a thickness of 100 ⁇ m was used as the first adhesive layer 35 and the second adhesive layer 36. .
  • Example 13 The state of the orange peel of the mirror with a vehicle image display function produced in Example 13 was C, and the ease of handling was A.
  • Example 14 As shown in FIG. 9, Example 14 has a vehicle image display function in the same manner as Example 8 except that a protective plate 38 is attached to the high retardation plate 34 using an OCA sheet. A mirror was produced. As the protective plate 38, a glass plate having a thickness of 0.75 mm was used.
  • the state of the orange peel of the vehicle image display function-equipped mirror produced in Example 14 was A, and the ease of handling was A.
  • Comparative Example 1 a mirror 100 with an image display function for a vehicle was manufactured as a laminated structure as shown in FIG. That is, the 1 ⁇ 4 wavelength plate 104 and the linearly polarized light reflection layer 103 were formed in this order from the front plate 105 toward the image display unit 101 side, and the mirror 100 with an image display function for vehicles was manufactured.
  • the linearly polarized light reflecting layer 103, the quarter wavelength plate 104, the front plate 105, and the image display unit 101 are the same as those in the first embodiment, and the linearly polarized light reflecting layer 103 and the quarter wavelength plates 104 and 1/4 are used.
  • Wave plate 104 and front plate 105 were bonded using OCA sheets (81 series (3M Japan)) 106 and 107, respectively. The thicknesses of the OCA sheets 106 and 107 were both 15 ⁇ m.
  • Comparative Example 2 In Comparative Example 2, a high phase difference plate, a circularly polarized light reflection layer, and a 1 ⁇ 4 wavelength plate were formed in this order from the front plate toward the image display unit to produce a vehicle image display function mirror.
  • the laminate of the circularly polarized light reflecting layer and the quarter wavelength plate, the high retardation plate, the front plate, and the image display unit the same ones as in Example 8 were used, and the laminated layer of the circularly polarized reflective layer and the quarter wavelength plate
  • the body and the high retardation plate, and the high retardation plate and the front plate were each bonded using an OCA sheet (81 series (manufactured by 3M Japan)). Both OCA sheets had a thickness of 15 ⁇ m.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Polarising Elements (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un rétroviseur de véhicule à fonction d'affichage d'image, qui permet une visualisation d'une image nette et d'une image de réflexion de rétroviseur sans dépendance directionnelle même lorsqu'un utilisateur utilise des lunettes de soleil polarisées, ou analogues, et qui permet de réduire une distorsion d'image de réflexion ; et un procédé de fabrication associé. Le rétroviseur de véhicule à fonction d'affichage d'image est pourvu d'une unité d'affichage d'image (20) permettant d'afficher une image capturée de l'environnement d'un véhicule et comprend, dans l'ordre à partir du côté unité d'affichage d'image (20) : une couche de réflexion de lumière polarisée linéairement (21) dans laquelle pénètre la lumière de l'image capturée affichée sur l'unité d'affichage d'image (20) ; un panneau avant (22) en verre ou en matière plastique ; et une lame quart d'onde (23). La couche de réflexion de lumière polarisée linéairement (21) et le panneau avant (22) sont collés l'un à l'autre au moyen d'une première couche adhésive monocouche (24), et le panneau avant (22) et la lame quart d'onde (23) sont collés l'un à l'autre au moyen d'une seconde couche adhésive monocouche (25).
PCT/JP2017/001477 2016-02-22 2017-01-18 Rétroviseur de véhicule à fonction d'affichage d'image et procédé de fabrication associé Ceased WO2017145580A1 (fr)

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CN112750368A (zh) * 2019-10-31 2021-05-04 株式会社日本有机雷特显示器 显示装置
JP2023086191A (ja) * 2021-12-10 2023-06-22 パナソニックＩｐマネジメント株式会社 表示装置

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WO2019078196A1 (fr) * 2017-10-16 2019-04-25 富士フイルム株式会社 Film optique, et plaque de surface avant de dispositif d'affichage d'image, dispositif d'affichage d'image, miroir pourvu d'une fonction d'affichage d'image, panneau tactile résistif et panneau tactile capacitif comportant ledit film optique
JP2019091029A (ja) * 2017-11-10 2019-06-13 住友化学株式会社 複合位相差板、光学積層体、及び画像表示装置
KR20240155243A (ko) * 2022-03-14 2024-10-28 닛토덴코 가부시키가이샤 렌즈부, 표시체 및 표시 방법
KR20240155242A (ko) * 2022-03-14 2024-10-28 닛토덴코 가부시키가이샤 렌즈부, 표시체 및 표시 방법

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