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WO2020116008A1 - Élément électro-optique et récipient contenant l'élément électro-optique - Google Patents

Élément électro-optique et récipient contenant l'élément électro-optique Download PDF

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Publication number
WO2020116008A1
WO2020116008A1 PCT/JP2019/038707 JP2019038707W WO2020116008A1 WO 2020116008 A1 WO2020116008 A1 WO 2020116008A1 JP 2019038707 W JP2019038707 W JP 2019038707W WO 2020116008 A1 WO2020116008 A1 WO 2020116008A1
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Prior art keywords
light
polarization
unit
electro
polarization axis
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PCT/JP2019/038707
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English (en)
Japanese (ja)
Inventor
足立　昌哉
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Japan Display Inc
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Japan Display Inc
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

Definitions

  • One embodiment of the present invention relates to an electro-optical element capable of switching between a transmissive state and a reflective state.
  • One embodiment of the present invention relates to a storage container capable of switching a visual state of an exterior portion between a transparent state and a reflective state.
  • Containers for storing items, etc. storage containers such as bags and hard utensils such as attaches and suitcases, or storage tools are usually made of opaque material, so check the contents from the outside. I can't. It is necessary to visually check the inside of such a conventional storage container or storage tool by opening the lid or the like in order to confirm the contents. However, if there are a plurality of storage containers or storage tools and it is not possible to find where the object to be searched is, opening the lids one by one and checking them is a complicated task. On the other hand, it is conceivable to form the exterior of the storage container or the storage tool with a transparent member, but in that case, the contents are always visible, which may cause inconvenience in terms of confidentiality, privacy, or quality control.
  • Patent Document 1 discloses a device capable of switching between a transparent state and a non-transparent state by utilizing the electro-optical effect of liquid crystal.
  • the conventional electro-optical element has a problem that it cannot give color. Since the light-shielding body formed by the electro-optical element is realized by scattering (white turbidity), absorption (black), or reflection (mirror surface), it is difficult to provide a storage container and a storage tool with a rich design. Have One embodiment of the present invention aims to solve such a problem.
  • a first substrate and a second substrate are arranged to face each other, and a first transparent electrode, a second transparent electrode, and a first transparent electrode are provided between the first substrate and the second substrate.
  • a transmission polarization axis converter having a liquid crystal layer between a substrate and a second substrate and having a first surface and a second surface opposite to the first surface, and a first surface side of the transmission polarization axis converter.
  • an absorption-type polarization unit having a transmission polarization axis in a first direction and an absorption polarization axis in a second direction orthogonal to the first direction, and a second surface side of the transmission polarization axis conversion unit.
  • Light polarized in the first direction which is disposed between the reflective polarization section having the transmission polarization axis in one direction and the reflection polarization axis in the second direction, and the transmission polarization axis conversion section and the reflection polarization section.
  • the light polarized in the second direction the light of the first wavelength band is absorbed and the light of the second wavelength band different from the first wavelength band is transmitted.
  • a phase control unit arranged on the opposite side of the reflective polarization unit from the wavelength selection polarization unit.
  • a storage container has an exterior part that forms a space inside, and at least a part of the exterior part can be switched between a transmission mode that transmits external light and a reflection mode that reflects external light.
  • the first and second substrates are arranged to face each other, and the first and second transparent electrodes and the first and second transparent electrodes are provided between the first and second substrates.
  • a transmission polarization axis converter having a liquid crystal layer between a substrate and a second substrate and having a first surface and a second surface opposite to the first surface, and a first surface side of the transmission polarization axis converter.
  • an absorption-type polarization unit having a transmission polarization axis in a first direction and an absorption polarization axis in a second direction orthogonal to the first direction, and arranged on the second surface side of the transmission polarization axis conversion unit. It has a transmission polarization axis for transmitting light polarized in one direction in the first direction, and absorbs light in the first wavelength band of light polarized in the second direction and is different from the first wavelength band.
  • It has a wavelength selection polarization part which has the absorption polarization axis which permeate
  • FIG. 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state where the electro-optical element is in a reflection mode.
  • 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state where the electro-optical element is in a transparent mode. It is a figure explaining the visual state of the electro-optic element concerning one embodiment of the present invention, and shows the case where an electro-optic element is in reflection mode.
  • FIG. 6 is a diagram illustrating a visual state of the electro-optical element according to the embodiment of the present invention, showing a case where the electro-optical element is in a transmission mode.
  • FIG. 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state in which the electro-optical element is in a reflection mode.
  • 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state where the electro-optical element is in a transparent mode. It is a figure explaining the visual state of the electro-optic element concerning one embodiment of the present invention, and shows the case where an electro-optic element is in reflection mode.
  • FIG. 6 is a diagram illustrating a visual state of the electro-optical element according to the embodiment of the present invention, showing a case where the electro-optical element is in a transmission mode.
  • FIG. 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state where the electro-optical element is in a reflection mode.
  • 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state where the electro-optical element is in a transparent mode. It is a figure explaining the visual state of the electro-optic element concerning one embodiment of the present invention, and shows the case where an electro-optic element is in reflection mode.
  • FIG. 6 is a diagram illustrating a visual state of the electro-optical element according to the embodiment of the present invention, showing a case where the electro-optical element is in a transmission mode.
  • FIG. 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state where the electro-optical element is in a reflection mode.
  • 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a state where the electro-optical element is in a transparent mode. It is a figure explaining the visual state of the electro-optic element concerning one embodiment of the present invention, and shows the case where an electro-optic element is in reflection mode.
  • FIG. 6 is a diagram illustrating a visual state of the electro-optical element according to the embodiment of the present invention, showing a case where the electro-optical element is in a transmission mode.
  • 1 shows a configuration of an electro-optical element according to an embodiment of the present invention, showing a case where a display screen is in a mirror surface mode.
  • An example of the storage container according to the present embodiment according to the embodiment of the present invention is shown, and a case where the storage container is in the reflection mode is shown.
  • 1 shows an example of a storage container according to the present embodiment according to an embodiment of the present invention, and shows a case where the storage container is in a transmission mode.
  • An example of the storage container according to the present embodiment according to the embodiment of the present invention is shown, and a case where the storage container is in the reflection mode is shown.
  • 1 shows an example of a storage container according to the present embodiment according to an embodiment of the present invention, and shows a case where the storage container is in a transmission mode.
  • FIG. 1 shows an example of a storage container according to the present embodiment according to an embodiment of the present invention, showing a case where the storage container is in a transmission mode.
  • An example of the wall material concerning this embodiment concerning one embodiment of the present invention is shown, and the case where a wall material is a reflection mode is shown.
  • An example of the wall material concerning this embodiment concerning one embodiment of the present invention is shown, and the case where a wall material is in penetration mode is shown.
  • a member or region when a member or region is “above (or below)” another member or region, it means that it is immediately above (or immediately below) another member or region unless otherwise specified. Not only in some cases, but also in cases above (or below) other members or areas, that is, including cases where another component is included above (or below) other members or areas. ..
  • the viewing side described below, or the side where the display screen is located is referred to as "upper” or “upper”, viewed from “upper” or “upper”.
  • the surface referred to as “upper surface” or “upper surface side” is referred to as "lower”, “downward”, “lower surface” or “lower surface side”.
  • the direction along the Y axis is orthogonal to the first direction and the Y axis.
  • the direction along the Z-axis is referred to as the second direction, and the direction along the X-axis orthogonal to the Y-axis and the Z-axis is referred to as the third direction.
  • an electro-optical element refers to a device including an electro-optical substance whose optical properties change with electrical energy, and the electro-optical substance includes a liquid crystal, an organic electroluminescent material, or the like. ..
  • the electro-optical element includes a device including a liquid crystal layer, a device including an organic electroluminescent material, a device including a dispersion medium in which electrophoretic particles are dispersed, a device using a quantum dot, a device using a micro LED, and the like. Shall be included.
  • the electro-optical element includes a device that controls the reflection direction of light with an electric signal, for example, a display device having a mechanical micromirror element.
  • FIGS. 1 and 2 show the configuration of an electro-optical element 100a according to an embodiment of the present invention. 1 and 2 schematically show the configuration of the electro-optical element 100a with a sectional structure.
  • the electro-optical element 100a has a first surface 101 and a second surface 102 opposite to the first surface 101.
  • first surface 101 is a side on which incident light (external light) is incident
  • second surface 102 is a surface corresponding to a back side with respect to a surface on which incident light (external light) is incident.
  • the electro-optical element 100a includes an absorption polarization unit 104, a transmission polarization axis conversion unit 106, a wavelength selection polarization unit 108, a reflection polarization unit 110, and a phase control unit 112 (simply, along the third direction from the first surface 101 side). (Also referred to as a retardation film or a retardation film).
  • the absorption-type polarization unit 104 has an absorption polarization axis in a predetermined direction and a transmission polarization axis in a direction orthogonal to the absorption polarization axis.
  • the transmission polarization axis of the absorption type polarization unit 104 appears in the direction orthogonal to the absorption polarization axis.
  • the wavelength selection polarization unit 108 has an absorption polarization axis that absorbs light in a specific wavelength band (first wavelength band) in a predetermined direction, and has a transmission polarization axis in a direction orthogonal to the absorption polarization axis.
  • the reflective polarization unit 110 has a reflection polarization axis in a predetermined direction and a transmission polarization axis in a direction orthogonal to the reflection polarization axis.
  • FIG. 1 and FIG. 2 are illustrated such that the respective parts are arranged with a gap therebetween for the sake of explanation, in reality, the respective parts are arranged close to each other or close to each other.
  • the gap between the respective parts may be filled with a medium such as a transparent adhesive. By filling the medium, it is possible to suppress light loss due to interface reflection at each part.
  • the absorptive polarization section 104 transmits the linearly polarized light component of the incident light I1 (natural light or artificial illumination light) in the first direction (hereinafter, also referred to as “first linearly polarized light component”), and the linearly polarized light component in the second direction. (Hereinafter, also referred to as “second linearly polarized light component”) is absorbed.
  • the linearly polarized light component in the first direction is a linearly polarized light component having a vibration direction in the first direction.
  • the polarization direction of the light transmitted through the absorption type polarization unit 104 is referred to as a transmission polarization axis.
  • the direction of the linearly polarized light which is the strongest component of the polarization components of the light transmitted through the absorption type polarization unit 104, is referred to as a transmission polarization axis.
  • the polarization direction of the light absorbed by the absorption type polarization section 104 is referred to as an absorption polarization section.
  • the direction of linearly polarized light which is the strongest component of the polarization components contained in the light absorbed by the absorption type polarization unit 104, is referred to as an absorption polarization axis. That is, the absorption polarization unit 104 has a transmission polarization axis in the first direction and an absorption polarization axis in the second direction.
  • the absorptive polarization unit 104 has a characteristic that the first linearly polarized light component of the incident light I1 is transmitted as transmitted light and the second linearly polarized light component is absorbed and is not transmitted.
  • the absorptive polarizing section 104 having such characteristics is realized by a polarizing plate or a polarizing film having an absorptive polarizer.
  • the transmission polarization axis conversion unit 106 is capable of controlling at least two states, that is, a state in which the polarization axis of incident light is changed and a state in which it is not changed.
  • the transmission polarization axis converter 106 is configured to be able to electrically control these two states. Specifically, the transmission polarization axis conversion unit 106 is controlled to be in a state of rotating the polarization direction of the light linearly polarized in one direction by 90 degrees and a state of not rotating it.
  • the transmission polarization axis conversion unit 106 having such a function is realized, for example, by utilizing the electro-optical effect of liquid crystal.
  • the transmission polarization axis conversion unit 106 includes a first substrate 114 provided with a first transparent electrode 122, a second substrate 116 provided with a second transparent electrode 124, and a liquid crystal layer 118 containing liquid crystal molecules 120.
  • the first substrate 114 and the second substrate 116 are arranged so that the first transparent electrode 122 and the second transparent electrode 124 face each other with a gap.
  • the liquid crystal layer 118 is arranged in the gap between the first substrate 114 and the second substrate 116.
  • a glass substrate or a flexible resin substrate is used as the first substrate 114 and the second substrate 116.
  • the alignment state of the liquid crystal molecules 120 is controlled by applying a potential difference between the first transparent electrode 122 and the second transparent electrode 124.
  • the first transparent electrode 122 and the second transparent electrode 124 are connected to a power source 126.
  • a switch 128 for controlling the connection state between the power source 126 and the first transparent electrode 122 and the second transparent electrode 124 is provided.
  • the power supply 126 is preferably composed of a power supply circuit that outputs an AC voltage. 1 and 2, the configuration including the power supply 126 and the switch 128 is shown, but similar functions may be realized by an integrated circuit.
  • the function of the switch 128 is realized by an integrated circuit that performs a switching operation based on a signal that selects a state in which a potential difference is provided between the first transparent electrode 122 and the second transparent electrode 124 and a state in which the potential difference is not provided. May be.
  • the first transparent electrode 122 and the second transparent electrode 124 are formed of a transparent conductive film such as ITO (Indium Thin Oxide) and IZO (Indium Zinc Oxide).
  • a transparent conductive film such as ITO (Indium Thin Oxide) and IZO (Indium Zinc Oxide).
  • an alignment film for aligning the liquid crystal may be formed on the surfaces of the first transparent electrode 122 and the second transparent electrode 124.
  • the liquid crystal layer 118 for example, twisted nematic liquid crystal is used. As shown in FIG. 1, in the twisted nematic liquid crystal, when no voltage is applied, the liquid crystal molecules 120 of the liquid crystal layer 118 have a pretilt angle of several degrees with respect to the main surfaces of the first substrate 114 and the second substrate 116. At the same time, the liquid crystal molecules are aligned in a direction substantially parallel to the main surface, and the orientation of the liquid crystal molecules 120 (specifically, the orientation of the long axis of the rod-shaped liquid crystal molecules 120) is twisted and oriented by 90 degrees.
  • the liquid crystal molecules 120 are twisted and aligned by 90 degrees while continuously rotating in one direction from the first transparent electrode 122 to the second transparent electrode 124 in a state where no voltage is applied.
  • a positive liquid crystal material is used as the liquid crystal molecules 120, and when a voltage is applied between the first transparent electrode 122 and the second transparent electrode 124, an electric field acts on the liquid crystal molecules 120 as shown in FIG.
  • the orientation is controlled in a direction (that is, a direction substantially perpendicular to the main surfaces of the first substrate 114 and the second substrate 116).
  • the transmission polarization axis conversion unit 106 converts the incident light linearly polarized in the first direction into light linearly polarized in the second direction, and the incident light linearly polarized in the first direction to the first mode. It operates in two modes, a second mode in which the light is linearly polarized in one direction and passes through.
  • FIG. 1 shows a case where the transmission polarization axis conversion unit 106 is in the first mode.
  • the liquid crystal molecules 120 of the liquid crystal layer 118 are arranged substantially parallel to the main surfaces of the first substrate 114 and the second substrate 116 and are twisted by 90 degrees and aligned.
  • the polarization axis rotates.
  • the first linearly polarized light component incident on the liquid crystal layer 118 is converted into the second linearly polarized light component and emitted.
  • FIG. 2 shows the case where the transmission polarization axis conversion unit 106 is in the second mode.
  • the second mode by applying a voltage to the liquid crystal layer 118, most of the liquid crystal molecules 120 are aligned in a direction substantially perpendicular to the main surfaces of the first substrate 114 and the second substrate 116.
  • the polarization state of the light passing through the liquid crystal layer 118 does not change, and the light of the first linear polarization component passes as it is.
  • the transmission polarization axis conversion unit 106 has a first mode that changes the polarization direction of the incident light that is linearly polarized by substantially 90 degrees and a second mode that does not change the polarization direction. Have.
  • the transmission polarization axis conversion unit 106 can switch between the first mode and the second mode by electrical control.
  • the transmission polarization axis conversion unit 106 can realize an intermediate polarization state between the first mode and the second mode by controlling the voltage. That is, by setting the voltage applied to the liquid crystal layer 106 to a voltage between the voltage of the first mode and the voltage of the second mode, an intermediate polarization state between the first mode and the second mode can be realized.
  • the liquid crystal layer 118 is not limited to twisted nematic liquid crystal.
  • a liquid crystal having negative type liquid crystal molecules in the liquid crystal layer 118 and initially aligned in a direction substantially perpendicular to the main surfaces of the first substrate 114 and the second substrate 116 may be used.
  • a liquid crystal that is homogeneously aligned in a direction substantially parallel to the main surfaces of the first substrate 114 and the second substrate 116 may be used.
  • in-plane switching (IPS) for driving liquid crystal molecules by a horizontal electric field parallel to the main surface, or liquid crystal molecules 120 by a fringe electric field is used.
  • a driven fringe field switching (FFS) configuration may be employed.
  • IPS or FFS a comb-teeth-shaped electrode which is a substitute for the first transparent electrode 122 is provided on one of the first substrate 114 and the second substrate 116, and a comb which is a substitute for the second transparent electrode 124 is provided. Toothed electrodes may be provided.
  • one of the first substrate 114 and the second substrate 116 is provided with a comb-tooth-shaped electrode which is a substitute for the first transparent electrode 122 and is provided with a comb-tooth-shaped electrode which is a substitute for the second transparent electrode 124.
  • a structure in which an insulating layer is provided between both electrodes may be adopted.
  • the wavelength selection polarization unit 108 has a transmission polarization axis arranged in the first direction and an absorption polarization axis arranged in the second direction.
  • the transmission polarization axis is arranged parallel to the transmission polarization axis of the absorption polarization unit 104
  • the absorption polarization axis is arranged parallel to the absorption polarization axis of the absorption polarization unit 104. ..
  • the wavelength selection polarization unit 108 transmits the first linearly polarized light component of the incident light, absorbs the visible light of the specific wavelength band (first wavelength band) of the second linearly polarized light component, and outputs the light other than the constant wavelength band.
  • Visible light (of a second wavelength band different from the specific wavelength band) is transmitted. That is, the wavelength selection polarization unit 108 transmits the light passing through the transmission polarization axis conversion unit 106 when the light is the first linear polarization component, and transmits the visible light in the specific wavelength band when the light is the second linear polarization component. Absorbs and transmits visible light outside the specified wavelength range.
  • the wavelength selection polarization unit 108 is a type of polarizing plate, and has an absorption polarization axis that absorbs visible light in a specific wavelength band and transmits visible light in a band other than the specific wavelength band.
  • the wavelength selection polarization unit 108 is transparent to visible light of the first linearly polarized light component, absorbs light other than the red band of visible light of the second linearly polarized light component, and absorbs light of the red band.
  • the wavelength selection polarization unit 108 having such characteristics is realized by using an absorption polarizer that absorbs light in a specific wavelength band.
  • light of a specific wavelength band means, in addition to light having a specific wavelength band of a continuous predetermined wavelength band, light having a specific wavelength band of a plurality of spaced wavelength bands, single wavelength identification Light in the wavelength band is also included.
  • the wavelength selective polarization unit 108 described above two wavelength bands apart from each other, a wavelength band less than 610 and a wavelength band greater than 780 nm, other than the red band of wavelengths 610 to 780 nm, are set as the specific wavelength bands.
  • the reflective polarization unit 110 transmits the first linearly polarized light component of the incident light and reflects the second linearly polarized light component.
  • the direction of the linearly polarized light which is the strongest component of the polarization components of the light reflected by the reflective polarization unit 110, is referred to as the reflection polarization axis.
  • a direction orthogonal to the reflection polarization axis is called a transmission polarization axis.
  • the reflective polarization unit 110 has a transmission polarization axis in the first direction and a reflection polarization axis in the second direction.
  • the reflection type polarization unit 110 having such polarization characteristics is, for example, a polarizing plate having a wire grid polarizer using metal nanowires, a polarizing film made of a laminate of polymer films, or a cholesteric liquid crystal layer and a quarter. It is realized by a configuration in combination with a wave plate.
  • a polarizing plate having a wire grid polarizer includes, for example, a polarizer formed of a wire grid, a base material that supports the polarizer, and a protective film.
  • polarizing film composed of a laminated body of polymer films for example, a birefringent reflective polarizing film having a structure in which a plurality of birefringent polymer films having mutually different birefringence are alternately laminated can be used.
  • the phase control unit 112 is also referred to as a retardation plate or a retardation film.
  • the phase controller 112 may be a laminated body including a retardation plate or a retardation film.
  • As the retardation plate and the retardation film for example, a quarter wave plate or a half wave plate is used.
  • the phase control unit 112 changes the polarization state of the incident linearly polarized light into, for example, circularly polarized light or elliptically polarized light and outputs the polarized light, so that the slow axis has a predetermined axis with respect to the reflective polarization axis of the reflective polarization unit 110. It is preferably arranged at an angle.
  • the phase control unit 112 may be arranged such that the polarization state of the incident linearly polarized light is changed to a mixed light state in which the polarization state different for each wavelength, for example, the elliptically polarized light different for each wavelength is emitted. ..
  • the phase control unit 112 is a quarter wavelength plate, it is preferable that the slow axis is arranged at an angle of 45 degrees with respect to the reflection polarization axis of the reflection type polarization unit 110.
  • the phase control unit 112 preferably has a phase difference (retardation: ⁇ nd) of not less than the wavelength of visible light, that is, not less than 780 nm.
  • ⁇ n is the difference between the refractive index of the phase controller 112 in the first direction (slow axis) and the second direction (fast axis), and d is the thickness of the phase controller 112.
  • the first direction and the second direction are in-plane directions of the phase control unit 112 (directions on the main surface of the phase control unit 112 and parallel to the main surface).
  • the phase controller 112 has different refractive indices in the in-plane direction between the first direction and the second direction, and the refractive index in the first direction (slow axis) and the refractive index in the second direction (fast axis).
  • the phase control unit 112 may have biaxiality different from the refractive index in the thickness direction.
  • phase control unit 112 By providing such a phase control unit 112, it is possible to change the polarization state of light that has passed through the reflection-type polarization unit 110 from linearly polarized light, and bring different polarization states for each wavelength into a mixed state. That is, the phase control unit 112 can change the linearly polarized light into light that has a random polarization state and is closer to natural light than linearly polarized light.
  • the absorption polarization unit 104 is arranged on one side (the first surface 101 side) of the transmission polarization axis conversion unit 106, and the wavelength selective polarization is arranged on the other side (the second surface 102 side). It has a configuration in which the unit 108, the reflective polarization unit 110, and the phase control unit 112 are arranged.
  • the transmission polarization axes of the absorption polarization unit 104, the wavelength selection polarization unit 108, and the reflection polarization unit 110 are arranged in parallel.
  • the absorption polarization section 104, the absorption polarization section of the wavelength selection polarization section 108, and the reflection polarization axis of the reflection polarization section 110 are arranged in parallel. Then, as described in the next section, the electro-optical element 100a is provided in the transmission polarization axis conversion unit 106 and the combination of the polarization axes of the absorption polarization unit 104, the wavelength selection polarization unit 108, and the reflection polarization unit 110.
  • the light in the specific wavelength band is reflected by the electro-optical effect of the liquid crystal layer 118 (the effect that occurs when light passes through the liquid crystal layer, and here, the effect of changing the polarization state, including the rotation of the polarization axis).
  • FIG. 1 shows a specific wavelength of the incident light (natural light and/or artificial illumination light whose light spectrum is widely distributed over the visible light band) incident from the first surface 101 side.
  • FIG. 2 shows a state in which the light in the band is emitted from the first surface 101 again as reflected light (hereinafter, also referred to as “reflection mode”), and
  • FIG. 2 shows incident light (natural light and/or artificial Illumination light that is white light or light equivalent thereto is in a state of being transmitted as it is (hereinafter, also referred to as “transmission mode”).
  • the incident light I1 incident on the absorptive polarization section 104 from the first surface 101 side (viewing side) has a second linear polarization component parallel to the absorption polarization axis.
  • the first linearly polarized light component that is absorbed and is parallel to the transmission polarization axis is transmitted.
  • the transmission polarization axis conversion unit 106 is in a state where the switch 128 is off and no voltage is applied from the power supply 126.
  • the liquid crystal molecules 120 are arranged substantially parallel to the first substrate 114 and the second substrate 116, and are oriented in a 90-degree twisted state from the first transparent electrode 122 to the second transparent electrode 124. That is, the transmission polarization axis converter 106 is in the first mode, and the incident light linearly polarized in the first direction is converted into light linearly polarized in the second direction.
  • the light passing through the transmission polarization axis conversion unit 106 has a linear polarization direction parallel to the absorption polarization axis of the wavelength selection polarization unit 108, and thus absorbs the second linear polarization component of light in a specific wavelength band, The second linearly polarized light component of the light in the other band is transmitted.
  • the light of the second linear polarization component that has passed through the wavelength selection polarization unit 108 is reflected by the reflection polarization unit 110 because the polarization direction of the light is parallel to the reflection polarization axis of the reflection polarization unit 110.
  • the light of the second linearly polarized light component reflected by the reflective polarization unit 110 is again transmitted through the wavelength selection polarization unit 108 and is incident on the transmission polarization axis conversion unit 106.
  • the reflected light of the second linearly polarized light component of the specific wavelength band that has entered the transmission polarization axis conversion unit 106 is converted to the first linearly polarized light component by rotating the polarization direction by 90 degrees by passing through the liquid crystal layer 118.
  • the reflected light as the first linearly polarized light component has a polarization direction parallel to the transmission polarization axis of the absorptive polarizing section 104, and therefore passes through the absorptive polarizing section 104 and is emitted from the first surface 101 as reflected light R1.
  • the incident light I1 incident from the first surface 101 side is linearly polarized, reflected by the reflective polarization unit 110, and emitted as reflected light R1 to the first surface 101 side.
  • the wavelength-selective polarization unit 108 acts to dim light having a wavelength other than the specific wavelength band.
  • the incident light I2 that is incident on the electro-optical element 100a from the second surface 102 side has a first linear polarization component that is not reflected or absorbed by the reflective polarization unit 110 and the wavelength selection polarization unit 108 and is converted into a transmission polarization axis. It is incident on the portion 106.
  • the polarization axis rotates by 90 degrees, so that the second linear polarization component enters the absorption polarization unit 104. Since the absorption polarization section 104 has the absorption polarization axis arranged in the second direction, the second linear polarization component of the incident light I2 is absorbed. Therefore, the incident light I2 cannot be transmitted through the electro-optical element 100a.
  • FIG. 3A schematically shows a state in which the electro-optical element 100a in the reflection mode is observed from the first surface 101 side.
  • a predetermined wavelength component of the incident light I1 is transmitted through the wavelength selection polarization unit 108, the transmitted light is reflected by the reflection type polarization unit 110, and the reflected light R1 is emitted from the first surface 101.
  • An observer who observes the electro-optical element 100a from the side of the first surface 101 can visually recognize the reflected light R1 that is dimmed to the light of the wavelength that is transmitted through the wavelength selection polarization unit 108. That is, the observer can visually recognize the state where the first surface 101 of the electro-optical element 100a is dimmed to a specific color.
  • an observer cannot visually recognize the article 900 on the back surface side (the second surface 102 side) of the electro-optical element 100a through the first surface 101.
  • light of various colors can be emitted from the first surface 101 as reflected light R1 by appropriately selecting the absorption characteristics of the absorption polarization axis of the wavelength selection polarization unit 108.
  • the absorption polarization axis of the wavelength selection polarization unit 108 has a characteristic of transmitting light in the red band
  • the light in the red band is emitted as reflected light
  • the absorption polarization axis has a characteristic of transmitting light in the green band.
  • light in the green band is emitted as reflected light
  • light in the blue band is emitted as reflected light.
  • the incident light I1 that has entered the absorptive polarization section 104 from the first surface 101 side transmits the first linearly polarized light component.
  • the switch 128 is turned on, and the power supply 126 applies a voltage having a magnitude that changes the orientation of the liquid crystal molecules 120 to the first transparent electrode 122 and the second transparent electrode 124.
  • the liquid crystal molecules 120 are aligned in a direction parallel to the electric field formed by the first transparent electrode 122 and the second transparent electrode 124.
  • the switch 128 is turned on, the transmission polarization axis conversion unit 106 enters the second mode, and the first linear polarization component of the incident light I1 passes through the transmission polarization axis conversion unit 106 without changing the polarization direction.
  • the transmission polarization axes of the wavelength selection polarization unit 108 and the reflection type polarization unit 110 are arranged parallel to the first direction.
  • the first linearly polarized light component that has passed through the transmission polarization axis conversion unit 106 passes through the wavelength selection polarization unit 108 and the reflection type polarization unit 110, and enters the phase control unit 112.
  • the polarization state of the first linearly polarized light component of the incident light changes when passing through the phase controller 112.
  • the polarization state of the first linearly polarized light component of the incident light I1 changes to a state in which elliptically polarized light of different states are mixed for each wavelength.
  • the electro-optical element 100a polarizes the incident light I1 incident from the first surface 101 side into linearly polarized light, and then transmits the linearly polarized light through the phase control unit 112, whereby a state close to natural light (linearly polarized light The light can be emitted from the second surface 102 side in a state where it is eliminated.
  • the reflected light from the article re-enters from the side of the second surface 102 of the electro-optical element 100a.
  • the transmission polarization axes of the reflective polarization section 110, the wavelength selection polarization section 108, and the absorption polarization section 104 are all arranged in the direction parallel to the first direction. Therefore, the reflected light R2 from the article passes through the first linearly polarized light component and is emitted from the first surface 101 as transmitted light T2.
  • FIG. 3B schematically shows a state in which the electro-optical element 100a in the transmission mode is observed from the first surface 101 side.
  • the electro-optical element 100a obtains the transmitted light T1 with respect to the incident light I1, and the reflected light R2 incident from the second surface 102 side is emitted as the transmitted light T2 from the first surface 101 side.
  • the transmission polarization axis conversion unit 106 controls the polarization direction and the polarization state of the light transmitted through the transmission polarization axis conversion unit 106, so that the electro-optical element 100a is switched between the reflection mode and the transmission mode. You can switch between two modes.
  • the transmission mode since the phase control unit 112 is provided on the second surface 102 side, the linear polarization state of the light that is incident from the first surface side of the electro-optical element 100a and is emitted from the second surface side is maintained. The light is relaxed and eliminated, and the light becomes closer to natural light. As a result, light in a state close to natural light that has passed through the electro-optical element 100a reaches the article existing on the second surface 102 side.
  • the article can be visually recognized through the electro-optical element 100a in a more natural state. Further, in the reflection mode, the electro-optical element 100a dims the light in the wavelength band that passes through the wavelength selective polarization unit 108, and dims the light dimmed by the action of the reflective polarization unit 110 to the first surface 101 side. Can be reflected. As a result, the electro-optical element 100a can reflect the incident light and render the color of the first surface 101.
  • the configuration of the electro-optical element 100b according to the embodiment of the present invention will be described with reference to FIG. In the following description, the part different from the first embodiment will be mainly described.
  • the absorption type polarization unit 104 In the electro-optical element 100b, the absorption type polarization unit 104, the transmission polarization axis conversion unit 106, the wavelength selection polarization unit 108, the reflection type polarization unit 110, and the phase control unit 112 are arranged from the first surface 101 side in the third direction. Has a configured configuration.
  • the absorption type polarization unit 104, the transmission polarization axis conversion unit 106, the reflection type polarization unit 110, and the phase control unit 112 have the same configurations and functions as those in the first embodiment.
  • the wavelength selection polarization unit 108 has an opening 130 that transmits the first linear polarization component and the second linear polarization component of the incident light I1.
  • the opening 130 is a region in the wavelength selective polarization unit 108 where no polarizer is provided.
  • the opening 130 is realized by a region in the wavelength selective polarization unit 108 in which only a polarizer is not provided, that is, a region having no polarization function.
  • the opening 130 is also realized by a through hole that penetrates the base material, the polarizer, and the protective film in the wavelength selective polarization unit 108. Since the opening 130 is at least a region having no absorption polarization axis, it is a region through which light passes without depending on the wavelength.
  • the size, shape, and range of the opening 130 can be set arbitrarily. Further, the wavelength selection polarization unit 108 may be provided with a plurality of openings 130. For example, in the wavelength selection polarization unit 108, the opening 130 may have a shape that represents a specific character, symbol, figure, pattern, or the like. In addition, the opening 130 may be formed in the plane of the wavelength selective polarization unit 108, or may be provided as a defective portion so that a part of the end portion is defective.
  • the wavelength selection polarization unit 108 transmits the light linearly polarized in the first direction, absorbs the light in the specific wavelength band of the light linearly polarized in the second direction, and excludes light other than the specific wavelength band. It includes two regions, a wavelength selective polarization region that transmits light and a transmission region that transmits light of the first linear polarization component and the second linear polarization component.
  • the transmission polarization axis and the absorption polarization axis of the absorption polarization section 104, the transmission polarization axis and the absorption polarization axis of the wavelength selection polarization section 108, and the transmission polarization axis and the absorption polarization axis of the reflection polarization section 110 are arranged as follows. This is similar to the first embodiment.
  • the electro-optical element 100b has the region in which the characteristic of the reflected light is different from that of the incident light I1 incident from the first surface 101 by providing the opening 130 in the wavelength selection polarization unit 108.
  • the second linearly polarized light component of the incident light I1 incident from the first surface 101 passes through the wavelength selection polarization unit 108 and is reflected by the reflective polarization unit 110, and the first surface is reflected light R1.
  • the first surface is reflected light R1.
  • FIGS. 4 and 5 show the case where the electro-optical element 100b is in the reflection mode
  • FIG. 5 shows the case where the electro-optical element 100b is in the transmission mode.
  • the reflected light reflected by the reflective polarization unit 110 and emitted from the first surface 101 is , There are at least two types.
  • the second linearly polarized light component of the incident light I1 that enters the region of the wavelength selective polarization unit 108 where the opening 130 is not provided is reflected by the reflective polarization unit 110 as in the case of the first embodiment, and finally Is emitted as reflected light R1 from the first surface 101.
  • the reflected light R1 is light in a wavelength band other than the specific wavelength band.
  • the second linearly polarized light component of the incident light I1 that enters the region of the wavelength selection polarization unit 108 where the opening 130 is provided is reflected by the reflective polarization unit 110 without changing the spectrum of the light. Therefore, the spectrum of the reflected light R3 is different from that of the reflected light R1.
  • the incident light I1 is white light
  • the reflected light R3 is light having no absorption loss in the specific wavelength band in the wavelength selective polarization unit 108, that is, white light.
  • the incident light I2 incident on the electro-optical element 100b from the second surface 102 side includes the area of the opening 130 where the first linear polarization component parallel to the transmission polarization axis of the reflection-type polarization unit 110 is included. Since the light is transmitted through the wavelength selection polarization unit 108, light is not emitted to the first surface 101 side as in the first embodiment.
  • FIG. 6A schematically shows a state in which the electro-optical element 100b in the reflection mode is observed from the first surface 101 side.
  • the incident light I1 is dimmed by the wavelength selection polarization unit 108 into light in a wavelength band other than the specific wavelength band, the dimmed light is reflected by the reflection-type polarization unit 110, and the reflected light R1 becomes the first light. Emitted from the surface 101.
  • the reflected light R3 having the same spectrum as the spectrum of the incident light I1 is emitted from the first surface 101.
  • an observer who observes the electro-optical element 100b can visually recognize a region where the color of the reflected light is different on the first surface 101.
  • the incident light I1 is white light
  • the observer reflects the colored reflected light R1 in a wavelength band other than the specific wavelength band wavelength-selected by the wavelength selection polarization unit 108 and the reflected light R1 having the same spectrum as the incident light I1.
  • the light R3 can be visually recognized. Note that the observer cannot visually recognize the article 900 on the back surface side (second surface 102 side) of the electro-optical element 100b through the first surface 101.
  • the reflection mode light of various colors can be emitted from the first surface 101 as reflected light R1 by appropriately selecting the characteristics of the absorption polarization axis of the wavelength selection polarization unit 108.
  • the shape of the opening 130 provided in the wavelength selection polarization unit 108 represents a character, a symbol, a figure, a pattern, or the like
  • the observer sees the character represented by the shape of the opening 130 due to the difference in the spectrum of the reflected light. , Symbols, figures, patterns, etc. can be visually recognized.
  • the first linearly polarized light component of the incident light I1 incident from the first surface 101 (viewing side) has a region that transmits the wavelength selection polarization unit 108 and a wavelength selection polarization unit. It has at least two paths of area through the openings 130 of 108.
  • the transmission polarization axis conversion unit 106 is in the second mode, the first linear polarization component of the incident light I1 passes through the wavelength selection polarization unit 108 regardless of the presence or absence of the opening 130, and in the case of the first embodiment.
  • the transmitted light T1 is generated for the incident light I1.
  • FIG. 6B schematically shows a state in which the electro-optical element 100b in the transmission mode is observed from the first surface 101 side.
  • the electro-optical element 100b obtains the transmitted light T1 with respect to the incident light I1, and the reflected light R2 incident from the second surface 102 side is emitted as the transmitted light T2 from the first surface 101 side.
  • the person can visually recognize the article 900 on the back surface (the second surface 102 side) of the electro-optical element 100a from the first surface 101 side.
  • the reflected light R2 from the article 900 is emitted as the transmitted light T2 from the first surface 101 side, so that the observer can visually recognize the article 900.
  • the observer cannot see the shape of the opening 130 from the first surface 101 side, or almost cannot see it. That is, in the transmissive mode, even if characters, symbols, figures, patterns, etc. are displayed by the opening 130, the observer cannot see them, or almost cannot see them.
  • the transmission polarization axis conversion unit 106 controls the polarization direction of the light transmitted through the transmission polarization axis conversion unit 106, so that the electro-optical element 100b is switched to the two modes of the reflection mode and the transmission mode. You can switch.
  • the electro-optical element 100b is provided with the opening 130 in the wavelength selection polarization unit 108, so that the first light of the wavelength band other than the specific wavelength band, which has passed through the wavelength selection polarization unit 108, of the incident light.
  • the two linearly polarized light components and the second linearly polarized light component of the incident light I1 that has passed through the opening 130 can be the reflected light of the reflective polarization unit 110.
  • the electro-optical element 100b can provide regions of different colors on the second surface 102 in the reflection mode. That is, the electro-optical element 100b can display characters, symbols, figures, patterns, etc. on the first surface 101 through the opening 130 in the reflective mode.
  • the article 900 on the back surface (on the side of the second surface 102) of the electro-optical element 100b can be visually recognized as in the first embodiment.
  • the characters, symbols, figures, patterns, etc. formed by the opening 130 are not displayed on the first surface 101, or are hardly displayed, so that the visibility of the article 900 is not affected. can do.
  • the electro-optical element 100b renders the reflected light of the first surface 101, displays a character, a symbol, a figure, a pattern, and the like, and sets the first surface 101 in a transparent state and the character, the symbol. It is possible to take two states, that is, a state in which no figure or pattern is displayed.
  • Third embodiment 3-1. Configuration of Electro-Optical Element
  • the configuration of the electro-optical element 100c according to the embodiment of the present invention will be described with reference to FIG. In the following description, the part different from the first embodiment will be mainly described.
  • the absorption polarization unit 104, the transmission polarization axis conversion unit 106, the wavelength selection polarization unit 108, the reflection polarization unit 110, and the phase control unit 112 are arranged along the third direction from the first surface 101 side.
  • the absorption type polarization unit 104, the transmission polarization axis conversion unit 106, the reflection type polarization unit 110, and the phase control unit 112 have the same configurations and functions as those in the first embodiment.
  • the wavelength selection polarization unit 108 has a light shielding unit 132.
  • the light blocking unit 132 blocks both the first linearly polarized light component and the second linearly polarized light component of the incident light.
  • the light shielding unit 132 is provided on the surface of the wavelength selection polarization unit 108 on the transmission polarization axis conversion unit 106 side or the surface of the reflection type polarization unit 110 side.
  • the light shielding portion 132 is formed of a material that absorbs light or a material that has a low reflectance and hardly transmits light.
  • the light blocking portion 132 is formed of, for example, a resin material containing a black pigment or dye.
  • the light shielding portion 132 is formed using a metal material having a lower reflectance than aluminum (Al) such as titanium (Ti), nickel (Ni), and chromium (Cr).
  • Al aluminum
  • the light shielding unit 132 may be integrally formed as a thin film on the surface of the wavelength selection polarization unit 108, or a member formed using a plate-shaped member or a film-shaped member may be attached to the surface of the wavelength selection polarization unit 108. May be.
  • the size, shape, and range of the light shielding unit 132 can be set arbitrarily. Further, in the wavelength selection polarization section 108, the light blocking section 132 may be provided in a plurality of divided locations. For example, in the wavelength selection polarization unit 108, the light blocking unit 132 may have a shape that represents a specific character, symbol, figure, pattern, or the like.
  • the wavelength selection polarization unit 108 transmits the first linearly polarized light component of the incident light, absorbs the light in the specific wavelength band of the light of the second linearly polarized light component, and transmits the light other than the specific wavelength band. It includes two regions, that is, a wavelength selective polarization region to be used and a light shielding region that shields the light of the first linear polarization component and the second linear polarization component.
  • the transmission polarization axis and the absorption polarization axis of the absorption polarization section 104, the transmission polarization axis and the absorption polarization axis of the wavelength selection polarization section 108, and the transmission polarization axis and the reflection polarization axis of the reflection polarization section 110 are arranged. This is similar to the first embodiment.
  • the electro-optical element 100c has the region where the reflection characteristics of the incident light incident from the first surface 101 are different due to the provision of the light shielding unit 132 in the wavelength selection polarization unit 108.
  • the electro-optical element 110c a region in which the incident light passes through the wavelength selection polarization unit 108 and is output as the reflected light of the reflective polarization unit 110, and the incident light is blocked by the light blocking unit 132 and is not output as the reflected light. And an area.
  • FIG. 7 shows a mode in which the light blocking section 132 is provided in the wavelength selection polarization section 108
  • the present embodiment is not limited to this mode. The same effect can be obtained even if any one of the absorption polarization unit 104, the transmission polarization axis conversion unit 106, and the reflection polarization unit 110 is provided with the light shielding unit 132.
  • FIGS. 7 and 8 show the operation of the electro-optical element 100c according to the present embodiment.
  • 7 shows the case where the electro-optical element 100c is in the reflection mode
  • FIG. 8 shows the case where the electro-optical element 100c is in the transmission mode.
  • the incident light I1 incident from the first surface 101 is reflected by the reflective polarization unit 110, and the reflected light R1 is emitted from the first surface 101. And a region where reflected light is not emitted, at least two regions are provided.
  • the incident light I1 that enters the region of the wavelength selection polarization unit 108 where the light shielding unit 132 is not provided the reflected light R1 is emitted from the first surface 101 as in the case of the first embodiment.
  • the reflected light R1 is light in a wavelength band other than the specific wavelength band.
  • the incident light I1 that is incident on the region of the light blocking section 132 of the wavelength selection polarization section 108 is blocked by the light blocking section 132. Therefore, in the region where the light shielding unit 132 is provided, even if the reflective polarization unit 110 is provided, the reflected light emitted to the first surface 101 is not generated.
  • FIG. 9A schematically shows a state in which the electro-optical element 100c in the reflection mode is observed from the first surface 101 side.
  • the incident light I1 is dimmed by the wavelength selective polarization unit 108 to a light in a wavelength band other than the specific wavelength band, the dimmed light is reflected by the reflective polarization unit 110, and the reflected light R1 is the first light.
  • the light is emitted from the surface 101 side.
  • the incident light I1 is not reflected, and therefore the reflected light R1 is not emitted.
  • an observer who observes the electro-optical element 100c can visually recognize a low-reflection (black) region corresponding to the shape of the light shielding portion 132 on the first surface 101. That is, the observer can visually recognize a colored region in a wavelength band other than the specific wavelength band selected by the wavelength selection polarization unit 108 and a low reflection (black) region based on the shape of the light shielding unit 132. Note that the observer can hardly see the article 900 on the back side (the second surface 102 side) of the electro-optical element 100c through the first surface 101, as in the first embodiment.
  • the reflection mode light of various colors can be emitted from the first surface 101 as reflected light R1 by appropriately selecting the characteristics of the absorption polarization axis of the wavelength selection polarization unit 108.
  • the shape of the light shielding portion 132 provided in the wavelength selection polarization unit 108 represents a character, a symbol, a figure, a pattern, etc.
  • the observer can see the characters, symbols, figures, patterns, etc. represented by the shape of the light shielding section 132. Can be seen.
  • the incident light I1 incident from the first surface 101 is divided into a region that transmits the wavelength selection polarization unit 108 and a region that is shielded by the light shielding unit 132. , Having at least two regions.
  • the incident light I1 becomes the transmitted light T1 that transmits the electro-optical element 100c, as in the case of the first embodiment.
  • the area of the light shielding portion 132 is an area where no transmitted light is generated.
  • the transmission polarization axes of the reflective polarization section 110, the wavelength selection polarization section 108, and the absorption polarization section 104 are arranged in parallel. Therefore, the first linearly polarized light component of the reflected light R2 from the article is emitted from the first surface 101 as the transmitted light T2. However, since light does not pass through the region where the light shielding portion 132 is provided, the transmitted light T2 emitted from the first surface 101 does not occur.
  • FIG. 9B schematically shows a state in which the electro-optical element 100c in the transmission mode is observed from the first surface 101 side.
  • the electro-optical element 100c can obtain the transmitted light T1 with respect to the incident light I1.
  • the reflected light R2 incident from the second surface 102 side is emitted as the transmitted light T2 from the first surface 101 side. Therefore, the observer can visually recognize the article 900 on the back surface (the second surface 102 side) of the electro-optical element 100c from the first surface 101 side.
  • the transmitted light T1 is not generated in the region where the light shielding portion 132 is provided. Further, in the region where the light blocking portion 132 is provided, the light (reflected light R2 shown in FIG.
  • the transmission polarization axis conversion unit 106 controls the polarization direction of the light transmitted through the transmission polarization axis conversion unit 106, so that the electro-optical element 100c is switched to the two modes of the reflection mode and the transmission mode. You can switch.
  • the electro-optical element 100c can reflect light in a wavelength band other than the specific wavelength band on the first surface 101 in the reflective mode to render a color, and in the transmissive mode, as in the first embodiment, the electro-optical element 100c.
  • the article 900 on the back surface (on the side of the second surface 102) can be visually recognized.
  • the light blocking section 132 is provided in the wavelength selection polarization section 108, characters, symbols, and figures displayed by the light blocking section 132 to the observer in both the transmission mode and the reflection mode. , Patterns, etc. can be displayed.
  • an absorption polarization unit 104 In the electro-optical element 100d, an absorption polarization unit 104, a transmission polarization axis conversion unit 106, a wavelength selection polarization unit 108, a reflection polarization unit 110, and a phase control unit 112 are arranged from the first surface 101 side in the third direction.
  • the absorption type polarization unit 104, the transmission polarization axis conversion unit 106, the reflection type polarization unit 110, and the phase control unit 112 have the same configurations and functions as those in the first embodiment.
  • the transmission polarization axis conversion unit 106 includes a first substrate 114 provided with a first transparent electrode 122, a second substrate 116 provided with a second transparent electrode 124, and a liquid crystal layer 118.
  • the second transparent electrode 124 has an opening 134 that forms a region having substantially no conductivity.
  • the size, shape, and range of the opening 134 provided in the transmission polarization axis conversion unit 106 can be set arbitrarily.
  • a plurality of openings 134 may be provided in the transmission polarization axis conversion unit 106.
  • the opening 134 provided in the second transparent electrode 124 may have a shape that represents a specific character, symbol, figure, pattern, or the like. Further, the opening 134 may be provided in the inner region of the second substrate 116 (or the first substrate 114), or spreads from the end portion of the second substrate 116 (or the first substrate 114) to the inner region. It may have a morphology.
  • the opening 134 may be provided on the first transparent electrode 122 side, or may be provided on both the first transparent electrode 122 and the second transparent electrode 124.
  • the transmission polarization axis conversion unit 106 when the switch 128 is turned on, the orientation of the liquid crystal molecules 120 in the region sandwiched between the first transparent electrode 122 and the second transparent electrode 124 changes. However, in the region where the opening 134 is provided, the orientation of the liquid crystal molecules 120 does not change because the electric field does not act. Therefore, the transmission polarization axis converter 106 changes the alignment of the liquid crystal molecules 120 and the region where the alignment of the liquid crystal molecules 120 of the liquid crystal layer 118 changes depending on whether or not a voltage is applied to the first transparent electrode 122 and the second transparent electrode 124. Including areas that do not.
  • the transmission polarization axis conversion unit 106 is provided with the opening 134, outside light is always reflected by the reflection type polarization unit regardless of the first mode or the second mode. It has a region reflected at 110.
  • FIGS. 10 and 11 show the case where the electro-optical element 100d is in the reflection mode
  • FIG. 13 shows the case where the electro-optical element 100d is in the transmission mode.
  • the reflected light reflected by the reflective polarization unit 110 and emitted from the first surface 101 is , There are at least two types. Incident light I1 that enters the region of the transmission polarization axis conversion unit 106 where the opening 134 is not provided is reflected by the reflective polarization unit 110 and emitted from the first surface 101 as in the case of the first embodiment. It becomes reflected light R1. Incident light I1 that enters the region of the transmission polarization axis conversion unit 106 where the opening 134 is provided also becomes reflected light R1 and is emitted from the first surface 101.
  • the reflected light R1 is light in the wavelength band other than the specific wavelength band because the reflected light R1 is the light transmitted through the wavelength selection polarization unit 108. That is, the spectrum of the reflected light R1 is different from the spectrum of the incident light I1.
  • the incident light I2 incident on the electro-optical element 100d from the second surface 102 side has the first linear polarization component parallel to the transmission polarization axis of the reflection-type polarization unit 110 including the region of the opening 134. Since the light is transmitted through the wavelength selective polarization unit 108, light is not emitted to the first surface 101 side as in the first embodiment.
  • FIG. 12A schematically shows a state in which the electro-optical element 100d in the reflection mode is observed from the first surface 101 side.
  • the incident light I1 is dimmed by the wavelength selective polarization unit 108 to a light in a wavelength band other than the specific wavelength band
  • the dimmed light is reflected by the reflective polarization unit 110
  • the reflected light R1 is the first light. Emitted from the surface 101.
  • the reflected light R1 is generated regardless of the presence or absence of the opening 134 of the transmission polarization axis conversion unit 106. Therefore, an observer who observes the electro-optical element 100d cannot visually recognize the region where the color of the reflected light is different on the first surface 101.
  • the electro-optical element 100d can emit the reflected light R1 from the entire first surface 101. In other words, the electro-optical element 100d can render the first surface 101 with the reflected light R1 in the wavelength band other than the specific wavelength band in the reflection mode.
  • the electro-optical element 100d has at least two regions in the transmission mode, that is, a region where the transmitted light T1 is generated and a region where the reflected light R1 is generated.
  • Transmitted light T1 is generated in a region where the incident light I1 passes through a portion other than the opening 134 of the transmitted polarization axis conversion unit 106.
  • the polarization axis rotates by 90 degrees, so that the light is reflected by the reflective polarization unit 110 as in the case of the reflection mode, and is reflected by the first surface 101 as reflected light R1. Is emitted.
  • the transmission polarization axes of the reflective polarization section 110, the wavelength selection polarization section 108, and the absorption polarization section 104 are arranged in parallel. Therefore, the first linearly polarized light component of the reflected light R2 from the article is emitted from the first surface 101 as the transmitted light T2.
  • the area where the opening 134 is provided is an area where the transmitted light T2 emitted from the first surface 101 is not generated, as in the case of the reflection mode.
  • FIG. 12B schematically shows a state where the electro-optical element 100d in the transmission mode is observed from the first surface 101 side.
  • the electro-optical element 100d can obtain the transmitted light T1 with respect to the incident light I1.
  • the reflected light R2 incident from the second surface 102 side is emitted from the first surface 101 side as transmitted light T2. Therefore, an observer can visually recognize the article 900 on the back surface (the second surface 102 side) of the electro-optical element 100d from the first surface 101 side.
  • reflected light R1 is generated in the region where the opening 134 is provided. Further, the observer cannot visually recognize the article 900 from the first surface 101 side at the portion where the opening 134 overlaps the article 900.
  • the observer can visually recognize the character, the symbol, the figure, the pattern, etc. represented by the shape of the opening 134.
  • the transmission polarization axis conversion unit 106 is provided with the opening 134 in which the orientation of the liquid crystal molecules 120 is not controlled by the electric field, so that the incident light is reflected in the reflection mode and becomes transparent in the transmission mode. At least two regions, a region and a region that reflects incident light in both the reflection mode and the transmission mode, can be formed.
  • the electro-optical element 100d can reflect light in a wavelength band other than the specific wavelength band on the first surface 101 in the reflection mode to render a color. In the transmission mode, the electro-optical element 100d has the same color rendering as that of the first embodiment.
  • the article 900 on the back surface (second surface 102 side) can be visually recognized.
  • the electro-optical element 100d is provided with the opening 134 in the transmission polarization axis conversion unit 106, so that the observer can display characters, symbols, figures, patterns and the like represented by the opening 134. Can be displayed. Since the reflected light generated in the transmission mode is the color-rendered light by the wavelength-selective polarization unit 108, the characters, symbols, figures, patterns, etc. represented by the openings 134 are color-rendered and then displayed on the first surface 101. be able to.
  • the present embodiment exemplifies the configuration of the electro-optical element 100a in which the absorption polarization unit 104, the transmission polarization axis conversion unit 106, the wavelength selection polarization unit 108, the reflection polarization unit 110, and the phase control unit 112 are integrated.
  • FIG. 13 shows a cross-sectional structure of the absorption polarization unit 104, the transmission polarization axis conversion unit 106, the wavelength selection polarization unit 108, the reflection polarization unit 110, and the phase control unit 112.
  • the absorption polarization unit 104, the transmission polarization axis conversion unit 106, the wavelength selection polarization unit 108, the reflection polarization unit 110, and the phase control unit 112 illustrated in FIG. 13 have the same configurations as those in the first embodiment.
  • a first substrate 114 provided with a first transparent electrode 122 and a second substrate 116 provided with a second transparent electrode 124 are bonded with a sealing material 136 with a gap, and The liquid crystal layer 118 is provided.
  • a spacer 138 is provided between the first substrate 114 and the second substrate 116. The spacer 138 is provided to keep the distance between the first substrate 114 and the second substrate 116 constant.
  • FIG. 13 shows both the case where the electro-optical element 100a is in the transmission mode and the case where it is in the reflection mode in the same drawing.
  • the transmission mode the light incident on the first surface 101 side passes through the absorption type polarization unit 104, the transmission polarization axis conversion unit 106, the wavelength selection polarization unit 108, the reflection type polarization unit 110, and the phase control unit 112.
  • the transmitted light of the electro-optical element 100a is linearly polarized light before it is transmitted through the phase control unit 112, but when passing through the phase control unit 112, the polarization state of the linearly polarized light is changed. , A state in which different polarization states are mixed for each wavelength, that is, a state closer to natural light than linearly polarized light is controlled.
  • the transmitted light is reflected by the surface of the article 900.
  • This reflected light enters from the second surface 102 side of the electro-optical element 100a and exits from the first surface 101 side.
  • the principles of incident light and reflected light in the transmission mode are as described in the first embodiment. Since the transmitted light with which the article 900 is irradiated is brought into a state close to natural light by the phase control unit 112, the reflected light with which the transmitted light is reflected by the article 900 is reflected light when the article 900 is irradiated with natural light. It will be in a state close to. Therefore, in the transmissive mode, the article 900 arranged on the second surface 102 side of the electro-optical element 100a can be visually recognized from the first surface 101 side in a state close to when it is irradiated with natural light.
  • the light incident on the first surface 101 has a specific wavelength band absorbed by the wavelength selection polarization unit 108, a wavelength band other than the specific wavelength band is transmitted, and is reflected by the reflection-type polarization unit 110 to generate the first light.
  • the light is emitted from the surface 101 as reflected light. Since the reflected light emitted from the first surface 101 is light in a wavelength band other than the specific wavelength band, it is visually recognized by an observer as if it was colored in a specific color.
  • the reflection mode even if the light source 902 exists on the second surface 102 side of the electro-optical element 100a, the light emitted from the light source 902 is not emitted from the first surface 101 or is hardly emitted.
  • the reflective mode the light incident from the first surface 101 of the electro-optical element 100a can be visually recognized as reflected light, and the light from the second surface 102 side can be almost blocked.
  • the electro-optical element 100a can switch between a state in which the back side can be visually recognized and a state in which the back side cannot be visually recognized. That is, the electro-optical element 100a can visually recognize the state from the first surface 101 side to the second surface 102 side in the transmissive mode, and from the first surface 101 side in the reflective mode. The state on the second surface 102 side can be made invisible. Further, in the transmission mode, the electro-optical element 100a linearly polarizes the external light incident from the first surface 101 side, and then irradiates the article on the second surface 102 side in a state closer to natural light as compared with the linearly polarized light. In the reflection mode, when the external light incident from the first surface 101 side is emitted as the reflected light, the reflected light can be color-rendered.
  • the present embodiment shows an example of a storage container that stores articles.
  • the storage container according to the present embodiment has a light control unit that controls whether the internal state is transparent or not transparent.
  • FIG. 14A shows an example of the storage container 200.
  • the storage container 200 includes a first exterior portion (container body portion) 202 and a second exterior portion (container lid portion) 204.
  • the first exterior part (container body part) 202 corresponds to a container body part that houses the article 900
  • the second exterior part (container lid part) 204 corresponds to a container cover part that closes the container body part.
  • the first exterior portion (container body portion) 202 and the second exterior portion (container lid portion) 204 are formed of an opaque member such as metal or plastic.
  • the storage container 200 by opening and closing the second exterior portion (container lid portion) 204, the state of the inside of the storage container 200 can be visually recognized as well as the loading and unloading of the article 900 to be stored in the first exterior portion (container main body portion) 202. You can
  • the storage container 200 has a light control section 206.
  • FIG. 14A shows a mode in which the light control section 206 is provided in the second exterior section (container lid section) 204.
  • the light control unit 206 is realized by the electro-optical element 100 according to the first embodiment to the fourth embodiment.
  • FIG. 14A shows a state in which the dimming unit 206 is in the reflection mode.
  • the light control section 206 is opaque, and the articles 900 stored in the storage container 200 cannot be visually recognized from the outside.
  • the dimming unit 206 is formed of the electro-optical element 100a according to the first embodiment or the electro-optical element 100d according to the fourth embodiment, the light of the specific wavelength band is reflected in the region of the dimming unit 206. , The internal state can be hidden. Further, by forming the dimming unit 206 by using the electro-optical element 100b according to the second embodiment or the electro-optical element 100c according to the third embodiment, a character or a symbol is formed in a partial area of the dimming unit 206. , Figures, patterns, etc. can be displayed.
  • FIG. 14B shows a state in which the light control unit 206 is in the transmission mode.
  • the light control unit 206 is in a state of being able to transmit external light, and the internal state of the storage container 200 can be visually recognized without opening the second exterior part (container lid) 204.
  • the article 900 can be viewed through the light control unit 206.
  • the dimming unit 206 is formed of the electro-optical element 100a according to the first embodiment or the electro-optical element 100b according to the second embodiment, the entire dimming unit 206 can be made transparent. Further, by forming the dimming unit 206 using the electro-optical element 100c according to the third embodiment or the electro-optical element 100d according to the fourth embodiment, characters, symbols, Figures, patterns, etc. can be displayed.
  • the storage container 200 may be provided with a switch 208 that switches the light control unit 206 between a reflection mode and a transmission mode.
  • the switch 208 may be realized by, for example, a touch sensor. Further, the function of the touch sensor may be added to the dimming unit 206 itself so as to have a function as a switch for selecting a mode.
  • the light control unit 206 When the light control unit 206 is in the reflection mode, light in a specific wavelength band is obtained as reflected light, so that at least a part of the storage container 200 can be colored and rendered. Further, characters, symbols, figures, patterns, etc. can be displayed in the color-rendered area. Thereby, the design of the storage container can be improved. In the reflection mode, the light control unit 206 does not transmit external light and becomes opaque, so that the inside cannot be visually recognized from the outside of the storage container 200, so that security and privacy can be secured.
  • the electro-optical element 100 according to the first embodiment to the fourth embodiment is provided with the phase control unit 112, so that when the dimming unit 206 is in the transmission mode, linearly polarized external light is compared with linearly polarized light. Then, the polarized state of light closer to natural light can be converted to irradiate the article 900. As a result, the visibility of the article 900 can be improved, and the detailed state can be visually recognized without a sense of discomfort.
  • the light control section 206 is rectangular, but the present embodiment is not limited to this shape.
  • the light control section 206 may be designed and provided in various shapes.
  • the dimming unit 206 may be provided on the upper surface and the side surface of the second exterior portion (container lid portion) 204, or at one or more locations on the side surface of the first exterior portion (container main body portion) 202.
  • a light control section 207 having the same function as the light control section 206 may be provided on the other side surface of the second exterior section (container lid section) 204.
  • the dimming unit 206 may form the entire second exterior portion (container lid portion) 204, or the entire storage container 200 except the bottom surface of the first exterior portion (container main body portion) 202. Alternatively, it may be formed over the entire storage container 200 including the bottom surface of the first exterior part (container main body part) 202.
  • the light control unit 206 may be provided along the curved surface of the storage container 200.
  • the light control section 206 may be provided along the curved surface shape of the second exterior section (container lid section) 204.
  • flexible substrates are used as the first substrate 114 and the second substrate 116, and the absorption polarization unit 104, the wavelength selection polarization unit 108, and the reflection polarization unit 110 are used.
  • a member such as a polarizing film can be used for each of the phase controller 112 and the phase controller 112.
  • the electro-optical element 100 can be provided with flexibility, and the light control section 206 can be provided along the curved shape of the storage container 200.
  • the light control section 206 can be provided along the curved shape of the storage container 200.
  • the viewing angle in the transmission mode is widened and the visibility can be improved.
  • 16A and 16B show a mode in which a plurality of light control units 206 are provided.
  • Each of the light control units may be designed to have different characteristics in the reflection mode.
  • the dimming unit 206a reflects the light including the first wavelength
  • the dimming unit 206b reflects the light including the second wavelength
  • the dimming unit 206c includes the third light.
  • the light including the wavelength may be reflected
  • the dimming unit 206d may be designed to reflect the light including the fourth wavelength.
  • the color of the storage container 200 can be enhanced and the designability can be improved.
  • the internal state of the storage container 200 can be divided and viewed in the transmissive mode.
  • the confidentiality can be enhanced while making the articles 900 visible.
  • the storage container 200 is not limited to the shape shown in FIGS. 14A and 14B.
  • the shape of the storage container 200 can be changed into various forms depending on the application.
  • the storage container 200 may be in the form of a suitcase for storing documents or clothes, or may be in the form of a case for storing in a closet or a storage door.
  • This embodiment shows an example of a wall material.
  • the wall material according to the present embodiment has a light control section that controls whether the region on the opposite side of the wall can be seen through or not.
  • the wall material 210 includes a light control section 212.
  • the light control section 212 may be provided so as to be surrounded by the frame 214 and to stand upright.
  • the light control section 212 is realized by the electro-optical element 100 according to the first embodiment to the fourth embodiment.
  • FIG. 17A shows a state in which the light control section 212 is in the reflection mode.
  • the light control section 212 is opaque, and the article 900 placed on the opposite side of the wall material 210 cannot be seen from the front side.
  • the dimming unit 212 is formed of the electro-optical element 100a according to the first embodiment or the electro-optical element 100d according to the fourth embodiment, the dimming unit 212 reflects light in a wavelength band other than the specific wavelength band.
  • the state on the opposite side of the wall material 210 can be made invisible.
  • a part of the light control section 212 as shown in FIG. 17A. Characters, symbols, figures, patterns, etc. can be displayed in the area of.
  • the light control section 212 is in the reflection mode, the front side cannot be seen through from the opposite side of the wall material 210 (the side on which the article 900 is placed).
  • FIG. 17B shows a state in which the light control section 212 is in the transmission mode.
  • the light control section 212 is in a state of being able to transmit outside light, and can see through the article 900 placed on the opposite side of the wall material 210.
  • the dimming section 212 is formed of the electro-optical element 100a according to the first embodiment or the electro-optical element 100b according to the second embodiment, the entire dimming section 212 can be made transparent.
  • the light control section 212 using the electro-optical element 100c according to the third embodiment or the electro-optical element 100d according to the fourth embodiment, as shown in FIG. 17B, a part of the light control section 212 is formed. Characters, symbols, figures, patterns, etc. can be displayed in the area of.
  • the wall material 210 may be provided with a switch for switching the light control section 212 between a reflection mode and a transmission mode.
  • the switch may be realized by, for example, a touch sensor.
  • the function of the touch sensor may be added to the light control section 212 itself so that the light control section 212 also has a function as a switch for selecting a mode.
  • the wall material 210 may include a power source (not shown) that drives the light control section 212.
  • the wall material 210 may be connected to an external power source.
  • a secondary battery for example, is used as the power source.
  • a configuration may be used in which electric power is supplied to the wall material 210 from an outlet or the like.
  • the light control section 212 When the light control section 212 is in the reflection mode, light in a specific wavelength band is obtained as reflected light, so that it is possible to give color to at least a part or the whole area of the wall material 210 to render the interior of the room. Further, characters, symbols, figures, patterns, etc. can be displayed in the color-rendered area. Thereby, the design of the wall material 210 can be improved. Since the light control section 212 becomes opaque and does not transmit external light in the reflection mode, privacy can be secured.
  • the electro-optical element 100 can be used not only as a member forming the wall material 210 but also as a window material.
  • Electro-optical element 101... First surface, 102... Second surface, 104... Absorption polarization section, 106... Transmission polarization axis conversion section, 108... Wavelength selective polarization Part, 110... Reflective polarization part, 112... Phase control part, 114... First substrate, 116... Second substrate, 118... Liquid crystal layer, 120... Liquid crystal molecule, 122 ⁇ First transparent electrode, 124 ⁇ Second transparent electrode, 126 ⁇ Power supply, 128 ⁇ Switch, 130 ⁇ Opening part, 132 ⁇ Light shielding part, 134 ⁇ Opening part, 136... Sealing material, 138... Spacer, 200... Storage container, 202... First exterior part (container main body part), 204... Second exterior part (container lid part), 206... ..Light control section, 208...Switch, 210...Wall material, 212...Light control section, 214...Frame, 900...Article, 902...Light source

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

Cet élément électro-optique selon la présente invention comprend : une unité de conversion d'axe de polarisation de transmission qui a une première surface et une seconde surface qui est sur le côté inverse de la première surface, et dans laquelle un premier substrat et un second substrat sont agencés de façon à se faire face l'un à l'autre, et une première électrode transparente et une seconde électrode transparente sont disposées entre le premier substrat et le second substrat, tout en ayant une couche de cristaux liquides agencée entre le premier substrat et le second substrat ; une unité de polarisation absorbante qui est agencée sur le premier côté de surface de l'unité de conversion d'axe de polarisation de transmission, et qui a un axe de polarisation de transmission dans une première direction, tout en ayant un axe de polarisation d'absorption dans une seconde direction qui est perpendiculaire à la première direction ; une unité de polarisation réfléchissante qui est agencée sur le second côté de surface de l'unité de conversion d'axe de polarisation de transmission, et qui a un axe de polarisation de transmission dans la première direction, tout en ayant un axe de polarisation de réflexion dans la seconde direction ; une unité de polarisation sélective de longueur d'onde qui est agencée entre l'unité de conversion d'axe de polarisation de transmission et l'unité de polarisation réfléchissante, et qui a un axe de polarisation de transmission dans la première direction, tout en ayant un axe de polarisation d'absorption dans la seconde direction, ledit axe de polarisation d'absorption absorbant la lumière dans une plage de longueurs d'onde spécifique parmi la lumière visible ; et une unité de commande de phase qui est disposée sur un côté de l'unité de polarisation réfléchissante, ledit côté étant opposé au côté de l'unité de polarisation sélective de longueur d'onde.
PCT/JP2019/038707 2018-12-06 2019-10-01 Élément électro-optique et récipient contenant l'élément électro-optique Ceased WO2020116008A1 (fr)

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