WO2021065484A1 - 表示媒体、表示物品及び表示セット - Google Patents

表示媒体、表示物品及び表示セット Download PDF

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Publication number
WO2021065484A1
WO2021065484A1 PCT/JP2020/034930 JP2020034930W WO2021065484A1 WO 2021065484 A1 WO2021065484 A1 WO 2021065484A1 JP 2020034930 W JP2020034930 W JP 2020034930W WO 2021065484 A1 WO2021065484 A1 WO 2021065484A1
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WIPO (PCT)
Prior art keywords
display
layer
pigment
reflective
polarized light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2020/034930
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English (en)
French (fr)
Japanese (ja)
Inventor
池田　顕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zeon Corp
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Zeon Corp
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Publication date
Application filed by Zeon Corp filed Critical Zeon Corp
Priority to CN202080065123.7A priority Critical patent/CN114402239B/zh
Priority to EP20871775.1A priority patent/EP4040201B1/en
Priority to JP2021550574A priority patent/JP7464059B2/ja
Priority to US17/753,822 priority patent/US12379535B2/en
Publication of WO2021065484A1 publication Critical patent/WO2021065484A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining

Definitions

  • the present invention relates to a display medium, a display article to be observed through the display medium, and a display set including a combination thereof.
  • Circular polarizing plates generally have a function of selectively transmitting one of circular polarization having a clockwise rotation direction (that is, right circular polarization) and circular polarization having a counterclockwise rotation direction (that is, left circular polarization). Have. Utilizing such a function, a circular polarizing plate has been conventionally used for authenticity identification (Patent Documents 1 and 2).
  • the present inventor considered that the function of the circular polarizing plate could be utilized in applications other than authenticity identification applications, and attempted to create a new display mode.
  • the present invention has been devised in view of the above problems, and an object of the present invention is to provide a display set capable of realizing a new display mode which has never existed in the past, and a display medium and display article applicable to the display set. To do.
  • the present inventor has diligently studied to solve the above-mentioned problems.
  • the present inventor has a display medium including a base material having a polarization separation layer having a circular polarization separation function and a reflection layer containing two or more kinds of pigments having a specific circular polarization separation function;
  • a base material and a reflective layer provided on the base material are provided. It said substrate to reflect circularly polarized light of one rotational direction D A, provided with a polarized light separation layer capable of transmitting circularly polarized light rotating in the opposite direction,
  • the reflective layer reflects circularly polarized light of one rotational direction D BR, a first reflecting pigments that may be transmitted through the circularly polarized light rotating in the opposite direction, to reflect circularly polarized light of one rotational direction D BL
  • a second reflective pigment which is capable of transmitting circular polarization in the opposite direction of rotation.
  • the rotational direction D BR of the circularly polarized light, wherein said first reflecting pigments can be reflected, and the second reflective pigment the rotational direction D BL of circularly polarized light can reflect is a reverse
  • the base material includes a retardation layer.
  • the in-plane retardation of the retardation layer at the measurement wavelength of 590 nm is “ ⁇ (2n + 1) / 2 ⁇ ⁇ 590 nm-30 nm” or more and “ ⁇ (2n + 1) / 2 ⁇ ⁇ 590 nm + 30 nm” or less (however, however). n represents an integer of 0 or more), the display medium according to [5].
  • the display article includes a base article and a display layer provided on the base article.
  • the display layer reflects circularly polarized light of one rotational direction D D, including display pigment capable of transmitting circularly polarized light in the direction of rotation of the opposite, the display article.
  • the display layer reflects the circular polarization of one rotation direction DDR and transmits the circular polarization in the opposite rotation direction, and the first display pigment and one rotation direction. Includes a second indicator pigment that can reflect the circular polarization of D DL and transmit the circular polarization in the opposite direction of rotation.
  • the rotation direction D DR of the circular polarization that the first display pigment can reflect and the rotation direction D DL of the circular polarization that the second display pigment can reflect are opposite.
  • the display article according to [7], wherein the hue of circularly polarized light that can reflect the first display pigment and the hue of circularly polarized light that can reflect the second display pigment are different.
  • the display medium comprising: a polarized light separation layer capable of transmitting circularly polarized light in the direction of rotation of the opposite, and the phase difference layer, the base material comprising It is a display article to be made
  • the display article includes a base article and a display layer provided on the base article.
  • the display layer reflects the first display pigment capable of reflecting the circular polarization of one rotation direction D DR and transmitting the circular polarization of the opposite rotation direction, and the circular polarization of one rotation direction D DL.
  • a second display pigment capable of transmitting circular polarization in the opposite direction of rotation, and The rotation direction D DR of the circular polarization that the first display pigment can reflect and the rotation direction D DL of the circular polarization that the second display pigment can reflect are opposite.
  • a display medium including a base material including a polarization separation layer capable of reflecting circularly polarized light in one rotation direction DA and transmitting circularly polarized light in the opposite rotation direction, and a retardation layer.
  • a display set including the display article according to [10].
  • the present invention it is possible to provide a display set capable of realizing a new display mode that has never existed in the past, and a display medium and display article applicable to the display set.
  • FIG. 1 is a cross-sectional view schematically showing a display medium according to the first embodiment of the present invention.
  • FIG. 2 is a schematic plan view of the display medium according to the first embodiment of the present invention as viewed from one side.
  • FIG. 3 is a schematic plan view of the display medium according to the first embodiment of the present invention as viewed from the other side.
  • FIG. 4 is a cross-sectional view schematically showing a display medium according to the first embodiment of the present invention.
  • FIG. 5 is a cross-sectional view schematically showing a display medium according to the first embodiment of the present invention.
  • FIG. 6 is a cross-sectional view schematically showing a display medium according to a second embodiment of the present invention.
  • FIG. 1 is a cross-sectional view schematically showing a display medium according to the first embodiment of the present invention.
  • FIG. 2 is a schematic plan view of the display medium according to the first embodiment of the present invention as viewed from one side.
  • FIG. 3 is a schematic plan view
  • FIG. 7 is a schematic plan view of the display medium according to the second embodiment of the present invention as viewed from one side.
  • FIG. 8 is a schematic plan view of the display medium according to the second embodiment of the present invention as viewed from the other side.
  • FIG. 9 is a cross-sectional view schematically showing a display medium according to a second embodiment of the present invention.
  • FIG. 10 is a cross-sectional view schematically showing a display medium according to a second embodiment of the present invention.
  • FIG. 11 is a cross-sectional view schematically showing a display set according to a third embodiment of the present invention.
  • FIG. 12 is a cross-sectional view schematically showing a display article included in the display set according to the third embodiment of the present invention.
  • FIG. 13 is a plan view schematically showing a display article included in the display set according to the third embodiment of the present invention.
  • FIG. 14 is a plan view schematically showing an image visually recognized when the display set shown in FIG. 11 is observed from above in the drawing.
  • FIG. 15 is a cross-sectional view schematically showing a display set according to a third embodiment of the present invention.
  • FIG. 16 is a plan view schematically showing an image visually recognized when the display set shown in FIG. 15 is observed from above in the drawing.
  • FIG. 17 is a cross-sectional view schematically showing a display set according to a fourth embodiment of the present invention.
  • FIG. 18 is a plan view schematically showing an image visually recognized when the display set shown in FIG. 17 is observed from above in the drawing.
  • FIG. 18 is a plan view schematically showing an image visually recognized when the display set shown in FIG. 17 is observed from above in the drawing.
  • FIG. 19 is a cross-sectional view schematically showing a display set according to a fourth embodiment of the present invention.
  • FIG. 20 is a plan view schematically showing an image visually recognized when the display set shown in FIG. 19 is observed from above in the drawing.
  • FIG. 21 is a cross-sectional view schematically showing the display set manufactured in the first embodiment.
  • FIG. 22 is a cross-sectional view schematically showing the display set manufactured in the second embodiment.
  • FIG. 23 is a cross-sectional view schematically showing the display set manufactured in the third embodiment.
  • FIG. 24 is a cross-sectional view schematically showing the display set manufactured in Comparative Example 1.
  • FIG. 25 is a cross-sectional view schematically showing the display set manufactured in Comparative Example 2.
  • nx represents the refractive index in the direction perpendicular to the thickness direction of the layer (in-plane direction) and in the direction in which the maximum refractive index is given.
  • ny represents the refractive index in the in-plane direction orthogonal to the nx direction.
  • d represents the thickness of the layer.
  • the measurement wavelength is 590 nm unless otherwise specified.
  • circularly polarized light includes elliptically polarized light as long as the effect of the present invention is not significantly impaired.
  • a display set includes a display medium and a display article.
  • the display medium includes a base material provided with a polarizing separation layer and a reflective layer provided on the base material.
  • the base material is a member having a first surface and a second surface opposite to the first surface, and a reflective layer is provided on at least one of the first surface and the second surface.
  • the display article includes a base article and a display layer provided on the base article.
  • the base material provided in the display medium transmits a part of irradiation light such as unpolarized light including both clockwise circularly polarized light (that is, right circularly polarized light) and counterclockwise circularly polarized light (that is, left circularly polarized light). Can be done.
  • the polarization separating layer the substrate is provided in, and reflect circularly polarized light of right-handed and one rotational direction D A counterclockwise, it is transmitted through the circularly polarized light of opposite direction of rotation and the direction of rotation D A sell. Therefore, the base material can be a member that is transparent or translucent with respect to the irradiation light.
  • the reflective layer included in the display medium reflects circularly polarized light of right-handed and one rotational direction D B counterclockwise, a plurality of pigments which can transmit circularly polarized light of the direction of rotation of the opposite, including.
  • the pigment contained in the reflective layer may be referred to as a "reflective pigment".
  • the reflecting pigments, the reflective layer, the second reflective pigments that can reflect circularly polarized light of the opposite rotational direction D BL is a first reflective pigments that can reflect circularly polarized light of one rotational direction D BR, and the direction of rotation D BR And are included in combination.
  • first-reflecting pigment and second-reflecting pigment are combined so that the hues of the circularly polarized light that can be reflected are different.
  • the hue of circularly polarized light that can be reflected by the reflective pigment may be referred to as "the hue of the reflective pigment”. Therefore, the hue of circularly polarized light that can be reflected by the first reflective pigment is sometimes referred to as the "hue of the first reflective pigment”. Further, the hue of circularly polarized light that can be reflected by the second reflective pigment may be referred to as "hue of the second reflective pigment".
  • the observer When observing this display medium from the reflection layer side, the observer usually sees the reflected light that has entered the reflection layer and is reflected without passing through the base material.
  • the reflective layer strong light reflection can occur in both the first reflective pigment and the second reflective pigment. Therefore, the reflected light from the reflective layer includes the circular polarization of the rotation direction DBR reflected by the first reflective pigment and the second.
  • second reflective pigments can be included in combination circularly polarized light of the direction of rotation D BL reflected. Therefore, the observer can visually recognize the reflective layer colored by the mixture of the hue of the first reflective pigment and the hue of the second reflective pigment.
  • the observer when the display medium is observed from the side opposite to the reflective layer, the observer usually sees the reflected light that has passed through the base material and then entered the reflective layer and reflected. Since the polarization separation layer of the substrate to reflect circularly polarized light of one rotational direction D A clockwise and counterclockwise circularly polarized light reflected by the substrate can not enter the reflective layer. Therefore, in the reflective layer, one of the reflective pigment capable of reflecting the right circular polarization and the reflective pigment capable of reflecting the left circular polarization does not reflect light or the reflection is weak.
  • the reflected light from the reflective layer does not include one of the circular polarization in the rotation direction DBR and the circular polarization in the rotation direction DBL , or even if it is included, the luminous flux is small. Therefore, the observer can visually recognize the reflection layer colored in one of the hue of the first reflection layer and the hue of the second reflection layer.
  • the hue of the reflective layer observed from the reflective layer side and the hue of the reflective layer observed from the opposite side of the reflective layer are observed.
  • the hue of the visible reflective layer can be different. Therefore, while the base material is transparent or translucent, the image of the display medium that is observed and visually recognized from one surface (for example, the front surface) and the image of the display medium that is observed and visually recognized from the other surface (for example, the back surface) are visually recognized.
  • the image of the display medium to be displayed may be different.
  • the base material is transparent or translucent as described above, at least a part of the display medium may be transparent or translucent. Therefore, the observer can observe the displayed article through the display medium.
  • Display layer of the display article includes a pigment capable of reflecting circularly polarized light of one direction of rotation D D clockwise and counterclockwise, and transmits the circularly polarized light rotating in the opposite direction.
  • the pigment contained in the display layer may be referred to as a "display pigment”.
  • the circularly polarized light reflected by this display pigment may be blocked by the base material of the display medium. Therefore, the image of the display article observed and visually recognized through the display medium may be different from the image of the display article observed and visually recognized without passing through the display medium.
  • the display layer can reflect the circular polarization of one rotation direction D DR as the display pigment and the second display pigment capable of reflecting the circular polarization of the rotation direction D DL opposite to the rotation direction D DR.
  • the colors of the display layer that are observed and visually recognized without passing through a display medium are the circularly polarized hues reflected by the first display pigment and the circularly polarized hues reflected by the second display pigment. It can be a color mixture with.
  • the color of the display layer observed and visually recognized through the display medium can be a circularly polarized hue that is not blocked by the base material of the display medium.
  • the circularly polarized hue reflected by the first display pigment and the second display It can be one of the circularly polarized hues reflected by the pigment. Therefore, since the hue of the display layer appearing in the image of the display article to be visually recognized may be different, the image of the display article to be visually recognized by observing through the display medium and the display article to be visually recognized by observing without passing through the display medium. Can be different from the image of.
  • the hue of circularly polarized light that the display pigment can reflect may be referred to as "the hue of the display pigment”. Therefore, the hue of circularly polarized light that can be reflected by the first display pigment may be referred to as "hue of the first display pigment". Further, the hue of circularly polarized light that can be reflected by the second display pigment may be referred to as "hue of the second display pigment".
  • the color of the visible display layer can be changed according to the orientation of the display medium. Since the retardation layer changes the polarization state of the light transmitted through the retardation layer, the rotation direction of the circularly polarized light blocked by the base material may differ depending on the traveling direction of the circularly polarized light. For example, when the right circularly polarized light applied to one surface of a base material having a retardation layer is blocked by the base material, the base material blocks the left circularly polarized light applied to the other side of the base material. Can be done. Therefore, the display medium can switch between right-handed circularly polarized light and left-handed circularly polarized light depending on the orientation of the front and back.
  • the color of the display layer observed and visually recognized through the display medium can be changed between the hue of the first display pigment and the hue of the second display pigment according to the orientation of the display medium. Therefore, the image of the display article observed and visually recognized through the display medium may differ depending on the orientation of the display medium.
  • the image of the display medium to be visually recognized may differ depending on the orientation of the display medium. Further, the image of the display article observed and visually recognized through the display medium may be different from the image of the display article observed and visually recognized through the display medium. Further, particularly when the base material of the display medium includes a retardation layer, the image of the display article observed and visually recognized through the display medium may differ depending on the orientation of the display medium. Therefore, by combining different images in this way, a complementary design can be realized, a new display mode that has not existed in the past can be achieved, and a complicated and highly flexible design can be created.
  • the base material of the display medium includes a retardation layer
  • the image of the display article observed and visually recognized through the display medium may differ depending on the orientation of the display medium. Therefore, a complementary design can be realized by combining the images of the display articles to be visually recognized regardless of the reflective layer of the display medium. Therefore, as another embodiment of the present invention, a display medium including a base material provided with a polarizing separation layer and a retardation layer; and a display article including a display layer containing a combination of a first display pigment and a second display pigment; A display set that includes may be implemented.
  • the display medium may not include a reflective layer and may include only a reflective pigment capable of reflecting circular polarization in one of the clockwise and counterclockwise rotation directions. Further, it is preferable that the first display pigment and the second display pigment contained in the display layer of the display article are combined so that the hue of the first display pigment and the hue of the second display pigment are different.
  • FIG. 1 is a cross-sectional view schematically showing a display medium 100 according to the first embodiment of the present invention.
  • FIG. 2 is a schematic plan view of the display medium 100 according to the first embodiment of the present invention as viewed from one side (the side on which the first reflective layer 120 is provided).
  • FIG. 3 is a schematic plan view of the display medium 100 according to the first embodiment of the present invention as viewed from the other side (the side on which the second reflective layer 130 is provided).
  • the display medium 100 is provided on the base material 110 having the first surface 110U and the second surface 110D and the first surface 110U of the base material 110.
  • the first reflective layer 120 as the reflected reflective layer and the second reflective layer 130 as the reflective layer provided on the second surface 110D of the base material 110 are provided.
  • the base material 110 is a member having a first surface 110U and a second surface 110D on the opposite side of the first surface 110U, and includes a polarization separating layer 111.
  • a sheet-like base material 110 having a first surface 110U as one of the front surface and the back surface and a second surface 110D as the other of the front surface and the back surface will be described as an example. ..
  • the polarization separation layer 111 has a circular polarization separation function.
  • the "circular polarization separation function” means a function of reflecting circular polarization in one of the clockwise and counterclockwise rotation directions and transmitting circular polarization in the opposite rotation direction.
  • the polarization separating layer 111 in the wavelength range capable of exhibiting the circularly polarized light separation function, reflects circularly polarized light of one rotational direction D A, and transmits the circularly polarized light of opposite direction of rotation and the direction of rotation D A be able to.
  • the wavelength range in which the circular polarization separation function can be exhibited is specifically the maximum reflectance (of the spectrum) of usually 35% to 50%, preferably 40% to 50% in the reflection spectrum measured at an incident angle of 5 °.
  • wavelength range of half-value full width of a peak having (maximum intensity) that is, a wavelength range showing intensity of "minimum intensity + (maximum intensity-minimum intensity) / 2" or more in the reflection spectrum.
  • the wavelength range in which the polarization separation layer 111 can exhibit the circular polarization separation function may be appropriately referred to as a “polarization separation wavelength range”.
  • the polarization separation wavelength range is preferably in the visible wavelength region.
  • the visible wavelength region usually refers to a wavelength region of 400 nm or more and 780 nm or less.
  • the wavelength width of the polarization separation wavelength range is wide.
  • the wavelength width of the specific polarization separation wavelength range is preferably 70 nm or more, more preferably 100 nm or more, still more preferably 200 nm or more, and particularly preferably 400 nm or more. Since the wavelength width of the polarization separation wavelength range is wide, the range of the circularly polarized color that can be reflected by the polarization separation layer 111 can be widened, so that the reflection layers such as the first reflection layer 120 and the second reflection layer 130 and the display article can be displayed. It is possible to increase the degree of freedom in color of the layers (not shown in FIGS. 1 to 3), and it is possible to display a display mode with high design.
  • the upper limit of the wavelength width in the polarization separation wavelength range is not particularly limited, but may be, for example, 600 nm or less.
  • the wavelength width of the polarization separation wavelength range can be measured by the method described in the examples.
  • a resin layer having cholesteric regularity is preferable.
  • a resin having cholesteric regularity may be appropriately referred to as "cholesteric resin” below.
  • Cholesteric regularity means that the molecular axes are aligned in a certain direction on one plane, but the direction of the molecular axes shifts at a slight angle on the next plane that overlaps with it, and further shifts on the next plane. As described above, the structure is such that the angle of the molecular axis in the plane is deviated (twisted) as it sequentially passes through the planes arranged in an overlapping manner.
  • the molecules inside a layer have cholesteric regularity, the molecules are arranged so that their molecular axes are oriented in a certain direction on a first plane inside the layer.
  • the direction of the molecular axis deviates slightly from the direction of the molecular axis in the first plane.
  • the direction of the molecular axis is further angled from the direction of the molecular axis in the second plane. In this way, in the planes that are arranged in an overlapping manner, the angles of the molecular axes in the planes are sequentially shifted (twisted).
  • Such a structure in which the direction of the molecular axis is twisted is usually a spiral structure and an optically chiral structure.
  • the cholesteric resin layer can exert a circular polarization separation function.
  • the reflection in the cholesteric resin layer reflects the circularly polarized light while maintaining its chirality.
  • the specific wavelength at which the cholesteric resin layer exerts the circular polarization separation function generally depends on the pitch of the helical structure in the cholesteric resin layer.
  • the pitch of the spiral structure is the distance in the plane normal direction until the direction of the molecular axis in the spiral structure gradually shifts as the direction of the molecular axis advances in the plane and then returns to the original molecular axis direction.
  • By changing the size of the pitch of this spiral structure it is possible to change the wavelength at which the circular polarization separation function is exhibited.
  • a method for adjusting the pitch for example, the method described in JP-A-2009-300622 can be used.
  • Specific examples include a method of adjusting the type of chiral agent and adjusting the amount of the chiral agent in the cholesteric liquid crystal composition.
  • a method of adjusting the type of chiral agent and adjusting the amount of the chiral agent in the cholesteric liquid crystal composition when the pitch size of the spiral structure is continuously changed in the layer, it is possible to obtain a circular polarization separation function over a wide wavelength range by a single layer of cholesteric resin.
  • Examples of the cholesteric resin layer capable of exhibiting the circular polarization separation function in a wide wavelength range include (i) a cholesteric resin layer in which the pitch size of the spiral structure is changed stepwise, and (ii) a spiral structure. Examples thereof include a layer of cholesteric resin in which the size of the pitch is continuously changed.
  • the cholesteric resin layer in which the pitch of the spiral structure is changed stepwise can be obtained, for example, by laminating a plurality of cholesteric resin layers having different pitches of the spiral structure.
  • Lamination can be performed by preparing a plurality of layers of cholesteric resin having different spiral structures in advance and then fixing each layer with an adhesive or an adhesive.
  • the lamination can be performed by forming a layer of a certain cholesteric resin and then sequentially forming another layer of a cholesteric resin.
  • the layer of the cholesteric resin in which the pitch size of the spiral structure is continuously changed includes, for example, one or more irradiation treatments of active energy rays and / or heating treatments on the layer of the liquid crystal composition. It can be obtained by curing the layer of the liquid crystal composition after performing the broadband treatment. According to the above-mentioned wide band processing, the pitch of the spiral structure can be continuously changed in the thickness direction, so that the wavelength range (reflection band) in which the layer of the cholesteric resin can exert the circular polarization separation function can be extended. It can, and is therefore called wideband processing.
  • the cholesteric resin layer may be a single-layer structure consisting of only one layer, or a multi-layer structure including two or more layers.
  • the number of layers contained in the cholesteric resin layer is preferably 1 to 100, more preferably 1 to 20, from the viewpoint of ease of production.
  • the cholesteric liquid crystal composition refers to a composition capable of exhibiting a liquid crystal phase (cholesteric liquid crystal phase) in which the liquid crystal compound has cholesteric regularity when the liquid crystal compound contained in the liquid crystal composition is oriented.
  • the material referred to as a "liquid crystal composition” for convenience includes not only a mixture of two or more substances but also a material composed of a single substance.
  • Specific examples of the method for producing the cholesteric resin layer include the methods described in JP-A-2014-174471 and JP-A-2015-27743.
  • the twisting direction in the cholesteric regularity can be appropriately selected depending on the structure of the chiral agent contained in the liquid crystal composition.
  • a cholesteric liquid crystal composition containing a chiral agent which imparts right-handedness is used, and when the twisting direction is counterclockwise, a cholesteric containing a chiral agent which imparts left-handedness is used.
  • a liquid crystal composition can be used.
  • the thickness of the polarizing separation layer 111 is preferably 2 ⁇ m or more, more preferably 3 ⁇ m or more, preferably 1000 ⁇ m or less, and more preferably 500 ⁇ m or less.
  • the thickness of the polarizing separation layer 111 is equal to or greater than the lower limit of the above range, the difference between the image of the display medium 100 which is visually recognized by observing one side and the image of the display medium 100 which is visually recognized by observing the other side is different. It can be especially clear.
  • the thickness of the polarizing separation layer 111 is not more than the upper limit of the above range, the transparency can be enhanced.
  • the base material 110 may include an arbitrary layer (not shown) as long as the effects of the present invention are not significantly impaired.
  • the optional layer include a support layer that supports the polarization separation layer 111, an adhesive layer that adheres the polarization separation layer 111 to another layer, and the like.
  • These optional layers preferably have a small in-plane retardation.
  • the specific in-plane retardation of any layer is preferably 20 nm or less, more preferably 10 nm or less, particularly preferably 5 nm or less, and ideally 0 nm. Since the layer having such a small in-plane retardation is an optically isotropic layer, it is possible to suppress a change in the polarization state due to the arbitrary layer.
  • the first reflective layer 120 as a reflective layer is provided on the first surface 110U of the base material 110.
  • the first reflective layer 120 may be provided directly on the first surface 110U of the base material 110, or may be indirectly provided.
  • a layer is provided “directly” on a surface, it means that there is no other layer between the surface and the layer.
  • "indirectly” providing a layer on a certain surface means that there is another layer (adhesive layer or the like) between the surface and the layer.
  • the first reflective layer 120 may be provided on a part of the first surface 110U of the base material 110, or may be provided on the entire first surface 110U. Usually, the first reflective layer 120 is provided so as to overlap the polarization separating layer 111 of the base material 110 when viewed from the thickness direction. That is, the position in the in-plane direction perpendicular to the thickness direction of the display medium 100 is usually the same for the entire first reflective layer 120 and a part or the whole of the polarizing separation layer 111. Further, the first reflective layer 120 may have a planar shape according to the design of the display medium 100. In the present embodiment, as shown in FIG. 2, the first reflective layer 120 having the planar shape of the letter “B” will be described as an example. In this example, the entire first reflective layer 120 overlaps a part of the polarizing separation layer 111 of the base material 110 when viewed from the thickness direction.
  • the first reflective layer 120 includes the first reflective pigment 121 and the second reflective pigment 122.
  • the first reflective layer 120 has the first reflective pigment 121 and the second reflective pigment 122. Can be included more than once.
  • the first reflective pigment 121 has a circular polarization separation function. Therefore, the first reflective pigment 121 in the wavelength range capable of exhibiting the circularly polarized light separation function, reflects circularly polarized light of one rotational direction D BR, transmitted circularly polarized light in the opposite rotational direction and the rotational direction D BR Can be made to.
  • the circularly polarized light that can be reflected by the first reflecting pigment 131 contained in the second reflecting layer 130 in order to distinguish from the rotation direction of the circularly polarized light that can be reflected by the first reflecting pigment 131 contained in the second reflecting layer 130, the circularly polarized light that can be reflected by the first reflecting pigment 121 contained in the first reflecting layer 120 The direction of rotation is indicated by the reference numeral "DBR1" as appropriate.
  • the wavelength range in which the first reflective pigment 121, the second reflective pigment 122, and the reflective pigments such as the first reflective pigment 131 and the second reflective pigment 132, which will be described later, can exhibit the circular polarization separation function is appropriately set to the “reflection wavelength range”. There is a case.
  • the second reflective pigment 122 has a circular polarization separation function. Therefore, the second reflective pigment 122 in the reflection wavelength range capable of exhibiting the circularly polarized light separating function, the one to reflect circularly polarized light in the direction of rotation D BL, circularly polarized light of reverse rotation direction to the rotation direction D BL It can be made transparent.
  • the circularly polarized light that can be reflected by the second reflecting pigment 132 contained in the second reflecting layer 130 the circularly polarized light that can be reflected by the second reflecting pigment 122 contained in the first reflecting layer 120
  • the direction of rotation is indicated by the reference numeral "D BL1" as appropriate.
  • the rotation direction D BL1 of the circular polarization capable of reflecting the second reflective pigment 122 is opposite to the rotation direction D BR1 of the circular polarization capable of reflecting the first reflective pigment 121.
  • the reflection wavelength range of the first reflective pigment 121 and the second reflective pigment 122 usually overlaps with the polarization separation wavelength range of the polarization separation layer 111 included in the base material 110.
  • a part of the reflection wavelength range and a part of the polarization separation wavelength range may overlap, or the whole reflection wavelength range and a part of the polarization separation wavelength range may overlap, and one of the reflection wavelength ranges.
  • the unit and the entire polarization separation wavelength range may overlap, or the entire reflection wavelength range and the entire polarization separation wavelength range may overlap. Above all, it is preferable that the reflection wavelength range is within the polarization separation wavelength range because the entire reflection wavelength range overlaps with a part or all of the polarization separation wavelength range.
  • the lower limit of the reflection wavelength range is equal to or higher than the lower limit of the polarization separation wavelength range
  • the upper limit of the reflection wavelength range is equal to or lower than the upper limit of the polarization separation wavelength range.
  • the combination of the first reflective pigment 121 and the second reflective pigment 122 is a combination of the hue of the first reflective pigment 121 (that is, the hue of circular polarization that the first reflective pigment 121 can reflect) and the hue of the second reflective pigment 122 (that is, the hue of circular polarization that the first reflective pigment 121 can reflect). That is, the hue of the circularly polarized light that the second reflective pigment 122 can reflect) is selected so as to be different. "Different hues" means that the hues are different to the extent that they can be discerned with the naked eye. In general, two pigments having different wavelength ranges capable of exhibiting the circular polarization separation function may have different hues.
  • the wavelength range in which the circular polarization separation function can be exhibited is different means that at least one of the minimum wavelength, the maximum wavelength, the center wavelength, and the wavelength width in the wavelength range in which the circular polarization separation function can be exhibited is different, and is preferable. Two or more are different, and particularly preferably all are different. Further, the degree of difference in these minimum wavelength, maximum wavelength, center wavelength and wavelength width is not limited as long as they can be distinguished with the naked eye, and for example, 10 nm or more, 20 nm or more, 30 nm or more, 40 nm or more, 50 nm or more, It can be 60 nm or more. Therefore, usually, the reflection wavelength range of the first reflective pigment 121 and the reflection wavelength range of the second reflective pigment 122 are different.
  • the arrangement of the first reflective pigment 121 and the second reflective pigment 122 in the first reflective layer 120 can be appropriately set so that the first reflective layer 120 having a desired design can be visually recognized during observation.
  • the first reflective pigment 121 and the second reflective pigment 122 may each be contained in a state of being uniformly dispersed throughout the first reflective layer 120.
  • the amounts of the first reflective pigment 121 and the second reflective pigment 122 in the first reflective layer 120 can be appropriately set so that the first reflective layer 120 having a desired hue can be visually recognized during observation.
  • the ratio may be set so that the hue of the first reflective pigment 121, the hue of the second reflective pigment 122, and the mixed color of both of them can be distinguished with the naked eye.
  • the second reflective layer 130 as another reflective layer is provided on the second surface 110D of the base material 110.
  • the second reflective layer 130 may be provided directly on the second surface 110D of the base material 110, or may be indirectly provided.
  • the second reflective layer 130 can be formed in the same manner as the first reflective layer 120, except that it is formed on the second surface 110D instead of the first surface 110U.
  • the second reflective layer 130 may be provided on a part of the second surface 110D of the base material 110, or may be provided on the entire second surface 110D. Further, the second reflective layer 130 is usually provided so as to overlap the polarizing separation layer 111 of the base material 110 when viewed from the thickness direction. In the present embodiment, as shown in FIG. 3, the second reflective layer 130 having the planar shape of the letter “E” will be described as an example.
  • the second reflective layer 130 includes the first reflective pigment 131 and the second reflective pigment 132.
  • the second reflective layer 130 has the first reflective pigment 131 and the second reflective pigment 132. Can be included more than once.
  • the first reflective pigment 131 and the second reflective pigment 132 included in the second reflective layer 130 can be the same as the first reflective pigment 121 and the second reflective pigment 122 included in the first reflective layer 120, respectively.
  • the first reflective pigment 131 and the second reflective pigment 132 have a circular polarization separation function. Therefore, the first reflective pigment 131, the reflection wavelength range capable of exhibiting the circularly polarized light separating function, the one to reflect circularly polarized light in the direction of rotation D BR, circularly polarized light of reverse rotation direction to the rotation direction D BR It can be made transparent.
  • the circle that the first reflective pigment 131 contained in the second reflective layer 130 can reflect in order to distinguish from the circularly polarized rotation direction DBR1 that the first reflective pigment 121 contained in the first reflective layer 120 can reflect, the circle that the first reflective pigment 131 contained in the second reflective layer 130 can reflect.
  • the direction of rotation of the polarization is indicated by the reference numeral "DBR2" as appropriate.
  • the rotation of the circularly polarized light that the second reflecting pigment 132 contained in the second reflecting layer 130 can reflect.
  • the direction is indicated by the reference numeral "D BL2" as appropriate.
  • the rotation direction D BL2 of the circular polarization that the second reflective pigment 132 can reflect is opposite to the rotation direction D BR2 of the circular polarization that the first reflection pigment 131 can reflect.
  • the reflection wavelength range of the first reflective pigment 131 and the second reflective pigment 132 usually overlaps with the polarization separation wavelength range of the polarization separation layer 111 included in the base material 110.
  • the combination of the first reflective pigment 131 and the second reflective pigment 132 is a combination of the hue of the first reflective pigment 131 (that is, the hue of circular polarization that the first reflective pigment 131 can reflect) and the hue of the second reflective pigment 132 (that is, the hue of circular polarization that the first reflective pigment 131 can reflect). That is, the hue of the circularly polarized light that the second reflective pigment 132 can reflect) is selected so as to be different.
  • the hue of the first reflective pigment 131 included in the second reflective layer 130 may be the same as or different from the hue of the first reflective pigment 121 included in the first reflective layer 120. Further, the hue of the second reflective pigment 132 included in the second reflective layer 130 may be the same as or different from the hue of the second reflective pigment 122 included in the first reflective layer 120.
  • the specific types and combinations of the first reflective pigment 121, the second reflective pigment 122, the first reflective pigment 131 and the second reflective pigment 132 are the first reflective layer 120 and the second reflective layer 130 having a desired design at the time of observation. Can be set appropriately so that
  • the arrangement and amount of the first reflective pigment 131 and the second reflective pigment 132 contained in the second reflective layer 130 are the same as the arrangement and amount of the first reflective pigment 121 and the second reflective pigment 122 contained in the first reflective layer 120.
  • the second reflective layer 130 of the desired design and hue can be appropriately set so that it can be visually recognized during observation.
  • the reflective pigments such as the first reflective pigment 121, the second reflective pigment 122, the first reflective pigment 131 and the second reflective pigment 132
  • a pigment containing flakes of cholesteric resin can be used. Since the flakes of the cholesteric resin include a minute layer of the cholesteric resin, the pigment containing the flakes can exhibit the circular polarization separation function as well as the layer of the cholesteric resin itself. Usually, due to the shearing force applied when forming a reflective layer containing a flake-containing pigment, the main surface of the flake and the layer plane of the reflective layer containing the flake-containing pigment are parallel or nearly parallel. It is oriented so that it becomes.
  • the circularly polarized light reflected by the flakes can cause scattering as a whole of the reflective layer.
  • the reflective layer can be visually recognized as an image different from the surroundings. Therefore, even when the color of the circularly polarized light reflected by the polarization separation layer 111 and the color of the circularly polarized light reflected by the reflection layer are the same, the first reflection layer 120 and the second reflection are caused by the above scattering. Reflective layers such as layer 130 can be visually recognized.
  • the particle size of the cholesteric resin flakes is preferably 1 ⁇ m or more in order to obtain decorativeness. Above all, it is desirable that the particle size of the flakes is equal to or larger than the thickness of the reflective layer containing the pigment containing the flakes. In this case, each flake is likely to be oriented so that the main surface of the flake and the layer plane of the reflective layer are parallel or at an acute angle. Therefore, the flakes can be effectively received, and the circular polarization separation function of the reflective layer can be enhanced.
  • the upper limit of the particle size of the flakes is preferably 500 ⁇ m or less, more preferably 100 ⁇ m or less, from the viewpoint of obtaining moldability and printability.
  • the particle size of the flakes means the diameter of a circle having the same area of the flakes.
  • the flakes of the cholesteric resin for example, the crushed product of the above-mentioned cholesteric resin layer can be used. Such flakes can be produced, for example, by the production method described in Japanese Patent No. 6142714.
  • the reflective layers such as the first reflective layer 120 and the second reflective layer 130 can be combined with any reflective pigment such as the first reflective pigment 121, the second reflective pigment 122, the first reflective pigment 131 and the second reflective pigment 132. It may contain an ingredient.
  • Optional components include binders that bind reflective pigments. Examples of the binder include polymers such as polyester-based polymers, acrylic-based polymers, polystyrene-based polymers, polyamide-based polymers, polyurethane-based polymers, polyolefin-based polymers, polycarbonate-based polymers, and polyvinyl-based polymers.
  • the amount of the binder is preferably 20 parts by weight or more, more preferably 40 parts by weight or more, particularly preferably 60 parts by weight or more, preferably 1000 parts by weight or less, and more preferably 800 parts by weight with respect to 100 parts by weight of the reflective pigment. It is less than a part by weight, particularly preferably 600 parts by weight or less.
  • the reflective layers such as the first reflective layer 120 and the second reflective layer 130 can be manufactured by applying, for example, an ink containing a reflective pigment, a solvent, and if necessary, an ink containing an arbitrary component, and drying the ink.
  • an inorganic solvent such as water may be used, or an organic solvent such as a ketone solvent, an alkyl halide solvent, an amide solvent, a sulfoxide solvent, a heterocyclic compound, a hydrocarbon solvent, an ester solvent, and an ether solvent may be used. Good.
  • the amount of the solvent is preferably 40 parts by weight or more, more preferably 60 parts by weight or more, particularly preferably 80 parts by weight or more, preferably 1000 parts by weight or less, and more preferably 800 parts by weight with respect to 100 parts by weight of the reflective pigment. It is less than a part by weight, particularly preferably 600 parts by weight or less.
  • the ink may contain a monomer of the polymer instead of or in combination with the polymer as a binder.
  • a reflective layer can be formed by applying ink, drying it, and then polymerizing the monomer.
  • the ink preferably contains a polymerization initiator.
  • 4 and 5 are cross-sectional views schematically showing the display medium 100 according to the first embodiment of the present invention. 4 and 5 show schematically the paths of light reflected by the polarizing separation layer 111, the first reflection layer 120, and the second reflection layer 130.
  • various light absorptions and reflections may occur in addition to those described below, but in the following description, the main light paths will be schematically described for convenience of explaining the action. ..
  • FIG. 4 shows a case where the first reflective layer 120 side of the display medium 100 is irradiated with irradiation light LI1 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • irradiation light LI1 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • the irradiation light LI1 enters the polarization separation layer 111 of the base material 110.
  • Some of the irradiated light L I1 is reflected by the polarization separating layer 111 as circularly polarized light L R1 rotational direction D A.
  • the first reflection layer 120 and the polarization separation layer 111 are arranged in this order, so that the irradiation light LI1 is the first reflection layer 120. Enter into. Since the irradiation light LI1 is reflected by the first reflective pigment 121 (not shown in FIG. 4) and the second reflective pigment 122 (not shown in FIG. 4), the reflected light L reflected by the first reflective layer 120.
  • R2 includes circular polarization in the rotation direction D BR1 reflected by the first reflective pigment 121 and circular polarization in the rotation direction D BL1 reflected by the second reflective pigment 122.
  • the hue of the reflected light L R2 at the first reflective layer 120 is made of color mixing of the color hue and the second reflective pigment 122 of the first reflective pigment 121.
  • the light L T2 other than the reflected light L R2 reflected by the first reflective layer 120 enters the polarization separating layer 111 of the substrate 110.
  • the light L T2 which enters the polarization separating layer 111 may include circularly polarized light L R3 in the rotational direction D A which can be reflected. Therefore, part of the light L T2 may be reflected by the polarization separating layer 111 as circularly polarized light L R3 rotational direction D A.
  • the light L T3 other than circularly polarized light L R3 reflected is transmitted through the polarization separating layer 111, exiting to the outside of the display medium 100.
  • the polarization separating layer 111 Like the area for the first reflective layer 120 and the second reflective layer 130 is not provided, some or all of the light L T3 exiting from the display medium 100, and a rotating direction D A reverse rotation direction of the circularly polarized light There is.
  • the polarization separation layer 111 and the second reflection layer 130 are arranged in this order, so that the irradiation light LI1 is the polarization of the base material 110. It enters the separation layer 111. A part of the irradiation light LI1 is reflected by the polarization separation layer 111 as circularly polarized light LR4 in the rotation direction DA. Light L T4 other than circularly polarized light L R4 reflected is transmitted through the polarization separating layer 111, it enters the second reflective layer 130.
  • the light L T4 entering the second reflective layer 130 may contain no circular polarization direction of rotation D A, containing only a small amount.
  • the rotation direction DBR2 of circularly polarized light capable of reflecting the first reflective pigment 131 (not shown in FIG. 4) contained in the second reflective layer 130 and the second reflective pigment 132 (not shown in FIG. 4) It is the opposite of the direction of rotation D BL2 of circularly polarized light that can be reflected. Therefore, one of the rotation direction D BR2 and rotational direction D BL2 coincides with the direction of rotation D A, other rotational direction D BR2 and rotational direction D BL2 becomes the rotation direction D A reverse.
  • the light LT4 that enters the second reflective layer 130 does not contain or contains only a small amount of circularly polarized light that can be reflected by either the first reflective pigment 131 or the second reflective pigment 132. Accordingly, all or most of the light L T4 entering the second reflective layer 130, one without being reflected by the first reflective pigment 131 and the second reflecting pigments 132, the first reflecting pigment 131 and the second reflecting pigment 132 Reflected by the other of. Therefore, the hue of the reflected light LR5 in the second reflecting layer 130 is the other hue of the first reflecting pigment 131 and the second reflecting pigment 132.
  • the light L T5 other than the reflected light L R5 exits to the outside of the display medium 100 passes through the second reflective layer 130.
  • the second reflective layer 130 Like the area for the first reflective layer 120 and the second reflective layer 130 is not provided, some or all of the light L T5 exiting from the display medium 100, and a rotating direction D A reverse rotation direction of the circularly polarized light There is.
  • the observer observes the first reflection as shown in FIG.
  • the layer 120 and the second reflective layer 130 can be visually recognized.
  • the observer visually recognizes the first reflective layer 120 which is colored by mixing the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122.
  • the observer visually recognizes the second reflective layer 130 colored in one of the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132.
  • the second reflective layer 130 specifically, the direction of rotation D A develops color hue of the reflection pigments which can reflect circularly polarized light of the opposite rotational direction.
  • FIG. 5 shows a case where the second reflective layer 130 side of the display medium 100 is irradiated with irradiation light LI2 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • irradiation light LI2 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • the irradiation light LI2 is applied to the polarization separation layer 111 of the base material 110 as in the case of FIG. enter in.
  • a part of the irradiation light LI2 is reflected by the polarization separation layer 111 as circularly polarized light LR6 in the rotation direction DA.
  • the reflected circularly polarized light L R6 other light L T6 is transmitted through the polarization separating layer 111, exiting to the outside of the display medium 100. Some or all of the light L T6 exiting from the display medium 100 passes through the polarization separating layer 111 has a direction of rotation D A reverse rotation direction of the circularly polarized light.
  • the polarizing separation layer 111 and the first reflective layer 120 are arranged in this order, so that the second reflective layer 130 in the case shown in FIG. 4
  • light reflection and transmission can occur. That is, a part of the irradiation light L I2 is reflected by the polarization separating layer 111 as circularly polarized light L R7 rotational direction D A.
  • Light L T7 other than circularly polarized light L R7 reflected is transmitted through the polarization separating layer 111, it enters the first reflective layer 120. All or most of the light LT7 that has entered the first reflective layer 120 is reflected by one of the first reflective pigment 121 (not shown in FIG.
  • the hue of the reflected light LR8 on the first reflective layer 120 is the other hue of the first reflective pigment 121 and the second reflective pigment 122. Further, among the light L T7 entering the first reflective layer 120, the light L T8 except the reflected light L R8 exits to the outside of the display medium 100 passes through the first reflective layer 120. Some or all of the light L T8 leaving the display medium 100 has a direction of rotation D A reverse rotation direction of the circularly polarized light.
  • the second reflective layer 130 and the polarizing separation layer 111 are arranged in this order, so that the first reflective layer 120 in the case shown in FIG. 4 As with the areas provided with, light reflection and transmission can occur. That is, since the irradiation light L I2 is reflected by the first reflecting pigment 131 (not shown in FIG. 5) and the second reflecting pigment 132 (not shown in FIG. 5), the reflected light L in the second reflecting layer 130.
  • the hue of R9 is a mixture of the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132.
  • the light L T9 other than the reflected light L R9 reflected by the second reflective layer 130 enters the polarization separating layer 111 of the substrate 110.
  • a part of the light LT9 that has entered can be reflected by the polarization separation layer 111 as the circularly polarized light LR10 in the rotation direction DA.
  • the light L T10 other than circularly polarized light L R10 reflected is transmitted through the polarization separating layer 111, exiting to the outside of the display medium 100.
  • Some or all of the light L T10 leaving the display medium 100 has a direction of rotation D A reverse rotation direction of the circularly polarized light.
  • the observer observes the first reflection as shown in FIG.
  • the layer 120 and the second reflective layer 130 can be visually recognized.
  • the observer visually recognizes the first reflective layer 120 which is colored in one of the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122.
  • the first reflective layer 120 specifically, the direction of rotation D A develops color hue of the reflection pigments which can reflect circularly polarized light of the opposite rotational direction.
  • the observer visually recognizes the second reflective layer 130 which is colored by mixing the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132.
  • the hue of the first reflective layer 120 appearing in the image observed and visually recognized from the first reflective layer 120 side while the base material 110 is transparent or translucent, and the first The hue of the first reflective layer 120 that appears in the image that is visually recognized when observed from the second reflective layer 130 side is different.
  • the hue of the second reflective layer 130 appearing in the image observed and visually recognized from the first reflective layer 120 side and the hue of the second reflective layer 130 appearing in the image observed and visually recognized from the second reflective layer 130 side. Is different. Therefore, according to the display medium 100, while the base material 110 is transparent or translucent, the image of the display medium observed from the front surface and the image of the display medium observed from the back surface can be seen. A specific display mode that can be made different is possible.
  • the shape, size, and material of the reflective layers, and the wavelength and reflectance of the circularly polarized light reflected by the reflective layer are determined. , May be the same or different.
  • the display medium 100 including the base material 110 without the retardation layer is shown as an example, but the base material may include the retardation layer.
  • the base material may include the retardation layer.
  • FIG. 6 is a cross-sectional view schematically showing the display medium 200 according to the second embodiment of the present invention.
  • FIG. 7 is a schematic plan view of the display medium 200 according to the second embodiment of the present invention as viewed from one side (the side on which the first reflective layer 120 is provided).
  • FIG. 8 is a schematic plan view of the display medium 200 according to the second embodiment of the present invention as viewed from the other side (the side on which the second reflective layer 130 is provided).
  • the display medium 200 according to the second embodiment of the present invention includes the base material 210 having the retardation layer 212 in place of the base material 110 not having the retardation layer 212. Other than that, it is provided in the same manner as the display medium 100 according to the first embodiment. Therefore, the display medium 200 according to the present embodiment includes a base material 210 having a first surface 210U and a second surface 210D, and a first reflection layer 120 as a reflection layer provided on the first surface 210U of the base material 210. A second reflective layer 130 as a reflective layer provided on the second surface 210D of the base material 210 is provided.
  • the base material 210 is provided in the same manner as the base material 110 described in the first embodiment, except that the retardation layer 212 is provided in combination with the polarization separation layer 111.
  • the base material 210 has a first surface 210U as a surface on the polarization separation layer side and a second surface 210D as a surface on the retardation layer side.
  • the “plane on the polarization separation layer side” of the base material 210 represents the surface of the front surface and the back surface of the base material 210 whose distance to the polarization separation layer 111 is shorter than the distance to the retardation layer 212. ..
  • the "plane on the retardation layer side" of the base material 210 is the surface of the front surface and the back surface of the base material 210 that has a longer distance to the polarization separation layer 111 than the distance to the retardation layer 212. Represents.
  • the retardation layer 212 is a layer having a specific range of in-plane retardation Re provided on one side of the polarization separation layer 111.
  • a part or the whole of the retardation layer 212 overlaps a part or the whole of the polarization separation layer 111. That is, the position in the in-plane direction perpendicular to the thickness direction of the display medium 200 is the same for a part or the whole of the retardation layer 212 and a part or the whole of the polarization separation layer 111.
  • a part or all of the retardation layer 212 is provided so as to overlap the first reflection layer 120 and the second reflection layer 130.
  • the position in the in-plane direction perpendicular to the thickness direction of the display medium 200 is a part or the whole of the retardation layer 212, the whole of the first reflection layer 120, and the whole of the second reflection layer 130. Usually they are the same.
  • the entire retardation layer 212 and the entire polarization separation layer 111 overlap each other, and a part of the retardation layer 212 and the first reflection layer 120 and the second reflection layer 130. An example in which the whole overlaps will be described.
  • the range of the in-plane retardation Re of the retardation layer 212 is such that an image visually recognized by observing one side of the display medium 200 and an image visually recognized by observing the other side of the display medium 200 are desired designs. It can be set within a range that differs to the extent that sex can be obtained. Normally, the in-plane retardation Re of the retardation layer 212 is set so that the rotation direction of the circularly polarized light transmitted through the polarization separation layer 111 can be reversed.
  • the specific range of the in-plane retardation Re of the retardation layer 212 is preferably " ⁇ (2n + 1) / 2 ⁇ x 590 nm-30 nm" or more, more preferably " ⁇ (2n + 1) /" at the measurement wavelength of 590 nm.
  • 2 ⁇ x 590 nm-20 nm or more particularly preferably " ⁇ (2n + 1) / 2 ⁇ x 590 nm-10 nm” or more, preferably “ ⁇ (2n + 1) / 2 ⁇ x 590 nm + 30 nm” or less, more preferably " ⁇ ( 2n + 1) / 2 ⁇ x 590 nm + 20 nm “or less, particularly preferably” ⁇ (2n + 1) / 2 ⁇ x 590 nm + 10 nm "or less.
  • n represents an integer of 0 or more.
  • the retardation layer 212 having the in-plane retardation Re in the above range at the measurement wavelength of 590 nm can usually function as a 1/2 wave plate in a wide range of the visible wavelength region, the retardation layer 212 causes circularly polarized light of a wide range of colors.
  • the polarization state of the can be adjusted appropriately. Therefore, the degree of freedom in color of the reflective layers such as the first reflective layer 120 and the second reflective layer 130 and the display layer of the display article (not shown in FIGS. 6 to 8) can be increased, so that the design can be improved. A high display mode is possible.
  • the retardation layer 212 preferably has anti-wavelength dispersibility.
  • the inverse wavelength dispersibility means that the in-plane retardations Re (450) and Re (550) at the measurement wavelengths of 450 nm and 550 nm satisfy the following formula (R1).
  • Re (450) ⁇ Re (550) (R1) The retardation layer 212 having anti-wavelength dispersibility can exhibit its optical function in a wide wavelength range. Therefore, by using the retardation layer 212 having anti-wavelength dispersibility, it can function as a 1/2 wave plate in a wide range of the visible wavelength region, so that the retardation layer 212 appropriately obtains the polarization state of circularly polarized light of a wide range of colors. Can be adjusted to. Therefore, the degree of freedom in color of the reflective layers such as the first reflective layer 120 and the second reflective layer 130 and the display layer of the display article (not shown in FIGS. 6 to 8) can be increased, so that the design is high. The display mode becomes possible.
  • a stretched film can be used as the retardation layer 212.
  • the stretched film is a film obtained by stretching a resin film, and an arbitrary in-plane retardation can be obtained by appropriately adjusting factors such as the type of resin, stretching conditions, and thickness.
  • a thermoplastic resin is usually used.
  • the thermoplastic resin may contain a polymer and optionally any component. Examples of the polymer include polycarbonate, polyethersulfone, polyethylene terephthalate, polyimide, polymethylmethacrylate, polysulfone, polyarylate, polyethylene, polyphenylene ether, polystyrene, polyvinyl chloride, cellulose diacetate, cellulose triacetate, and alicyclic type. Examples include structure-containing polymers.
  • one type of polymer may be used alone, or two or more types may be used in combination at an arbitrary ratio.
  • an alicyclic structure-containing polymer is preferable from the viewpoints of transparency, low hygroscopicity, dimensional stability and processability.
  • the alicyclic structure-containing polymer is a polymer having an alicyclic structure in the main chain and / or the side chain, and for example, those described in JP-A-2007-057791 can be used.
  • the stretched film as the retardation layer 212 can be manufactured by producing a resin film from the above resin and then subjecting the resin film to a stretching treatment.
  • Specific examples of the method for producing the retardation layer 212 as a stretched film include the method described in International Publication No. 2019/059067.
  • the thickness of the stretched film is not particularly limited, but is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, particularly preferably 20 ⁇ m or more, preferably 1 mm or less, more preferably 500 ⁇ m or less, and particularly preferably 200 ⁇ m or less. ..
  • a liquid crystal cured layer may be used as the retardation layer 212.
  • the liquid crystal cured layer is a layer formed of a cured product of a liquid crystal composition containing a liquid crystal compound.
  • a liquid crystal cured layer is obtained by forming a layer of the liquid crystal composition, orienting the molecules of the liquid crystal compound contained in the layer of the liquid crystal composition, and then curing the layer of the liquid crystal composition.
  • an arbitrary in-plane retardation can be obtained by appropriately adjusting factors such as the type of the liquid crystal compound, the orientation state of the liquid crystal compound, and the thickness.
  • the type of the liquid crystal compound is arbitrary, but when it is desired to obtain the retardation layer 212 having the reverse wavelength dispersibility, it is preferable to use the reverse wavelength dispersive liquid crystal compound.
  • the reverse wavelength dispersible liquid crystal compound refers to a liquid crystal compound that exhibits reverse wavelength dispersibility when homogenically oriented. Further, homogenically aligning a liquid crystal compound means that a layer containing the liquid crystal compound is formed, and the direction of the maximum refractive index in the refractive index ellipse of the molecule of the liquid crystal compound in the layer is parallel to the plane of the layer. Orienting in one direction.
  • Specific examples of the inverse wavelength-dispersible liquid crystal compound include the compounds described in International Publication No. 2014/069515, International Publication No. 2015/064851 and the like.
  • the thickness of the liquid crystal cured layer is not particularly limited, but is preferably 0.5 ⁇ m or more, more preferably 1.0 ⁇ m or more, preferably 10 ⁇ m or less, more preferably 7 ⁇ m or less, and particularly preferably 5 ⁇ m or less.
  • the base material 210 including the retardation layer 212 in combination with the polarization separation layer 111 can switch between right-handed circular polarization and left-hand circular polarization depending on the orientation of the front and back surfaces.
  • the irradiation light including circular polarization direction of rotation D A where the polarization separating layer 111 can reflect and the circularly polarized light rotating in the opposite direction is, first surface 210U (i.e., polarized light separation layer side of the substrate 210 when irradiated on the surface), the substrate 210 reflects the circularly polarized light in the rotational direction D a, capable of transmitting the other circularly polarized light.
  • other circularly polarized light can be transmitted. Therefore, in the display medium 200 of the present embodiment using the base material 210 provided with the retardation layer 212, the display medium 100 described in the first embodiment is reflected by the first reflection layer 120 and the second reflection layer 130. Polarization can be different. Therefore, the display medium 200 of the present embodiment can achieve a display mode different from that of the display medium 100 described in the first embodiment.
  • the display mode will be specifically described with reference to the drawings.
  • 9 and 10 are cross-sectional views schematically showing the display medium 200 according to the second embodiment of the present invention.
  • 9 and 10 show schematically the paths of light reflected by the polarizing separation layer 111, the first reflection layer 120, and the second reflection layer 130.
  • various light absorptions and reflections may occur in addition to those described below, but in the following description, the main light paths will be schematically described for convenience of explaining the action. ..
  • FIG. 9 shows a case where the first reflective layer 120 side of the display medium 200 is irradiated with irradiation light LI3 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • irradiation light LI3 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • the polarization separation layer 111 and the retardation layer 212 are arranged in this order, so that the irradiation light LI3 can be obtained. It enters the polarization separation layer 111 of the base material 210. A part of the irradiation light LI3 is reflected by the polarization separation layer 111 as the circularly polarized light LR11 in the rotation direction DA.
  • the first reflective layer 120 in the area where the first reflective layer 120 is provided, the first reflective layer 120, since the polarization separating layer 111 and the phase difference layer 212 are arranged in this order, the irradiation light L I3, It enters the first reflective layer 120. Since the irradiation light LI3 is reflected by the first reflective pigment 121 (not shown in FIG. 9) and the second reflective pigment 122 (not shown in FIG. 9), the reflected light LR12 of the first reflective layer 120 The hue is a mixture of the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122.
  • the light L T12 other than circularly polarized light L R12 reflected by the first reflective layer 120 enters the polarization separating layer 111 of the substrate 210.
  • a part of the light LT12 that has entered can be reflected by the polarization separation layer 111 as the circularly polarized light L R13 in the rotation direction DA.
  • the light L T13 other than circularly polarized light L R13 reflected is transmitted through the polarization separating layer 111 and the retardation layer 212, exiting to the outside of the display medium 200.
  • some or all of the light L T13 leaving the display medium 200 has become a circularly polarized light in the same rotational direction as the rotational direction D A ..
  • the irradiation light L I3 is It enters the polarization separation layer 111 of the base material 210.
  • a part of the irradiation light LI3 is reflected by the polarization separation layer 111 as circularly polarized light LR14 in the rotation direction DA.
  • Light L T14 other than circularly polarized light L R14 reflected is transmitted through the polarization separating layer 111, further passes through the retardation layer 212, enters the second reflective layer 130.
  • the rotation direction of the circularly polarized light of the light LT14 transmitted through the polarization separation layer 111 is reversed by transmitting through the retardation layer 212, the time when the light LT14 passes through the retardation layer 212 and enters the second reflective layer 130. in the light L T14 is the rotation direction D a contain no circular polarization of opposite rotating direction, it contains only a small amount. Therefore, the light LT14 that enters the second reflective layer 130 has circularly polarized light that can be reflected by either the first reflective pigment 131 (not shown in FIG. 9) or the second reflective pigment 132 (not shown in FIG. 9). , Do not contain or contain only a small amount.
  • the hue of the reflected light LR15 on the second reflecting layer 130 is the other hue of the first reflecting pigment 131 and the second reflecting pigment 132.
  • the light L T15 other than the reflected light L R15 exits to the outside of the display medium 200 passes through the second reflective layer 130.
  • some or all of the light L T15 leaving the display medium 200 has become a circularly polarized light in the same rotational direction as the rotational direction D A ..
  • the observer observes the first reflection as shown in FIG.
  • the layer 120 and the second reflective layer 130 can be visually recognized.
  • the observer visually recognizes the first reflective layer 120 which is colored by mixing the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122.
  • the observer visually recognizes the second reflective layer 130 colored in one of the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132.
  • the second reflective layer 130 specifically, develops color hue of the reflection pigments which can reflect circularly polarized light in the same rotational direction as the rotational direction D A.
  • FIG. 10 shows a case where the second reflective layer 130 side of the display medium 200 is irradiated with irradiation light LI4 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • irradiation light LI4 such as unpolarized light including both right-handed circularly polarized light and left-handed circularly polarized light.
  • a part of the irradiation light LI4 is reflected by the polarization separation layer 111 as circularly polarized light LR16 in the rotation direction DA, and the rotation direction is reversed by passing through the retardation layer 212.
  • Light L T16 other than circularly polarized light L R16 reflected is transmitted through the polarization separating layer 111, exiting to the outside of the display medium 200. Since circularly polarized light L R16 are reflected by the polarization separating layer 111, some or all of the light L T16 leaving the display medium 200 passes through the polarization separating layer 111, the direction of rotation D A reverse rotation direction of the circularly polarized light It has become.
  • the phase difference layer 212, the polarization separating layer 111 and the first reflective layer 120 are arranged in this order, the irradiation light L I4, It passes through the retardation layer 212 and enters the polarization separation layer 111.
  • a part of the irradiation light LI4 is reflected by the polarization separation layer 111 as circularly polarized light LR17 in the rotation direction DA, and the rotation direction is reversed by passing through the retardation layer 212.
  • Light L T17 other than circularly polarized light L R17 reflected is transmitted through the polarization separating layer 111, it enters the first reflective layer 120.
  • Light L T17 entering the first reflection layer 120 does not contain the circular polarization direction of rotation D A, containing only a small amount. Therefore, the light LT17 entering the first reflective layer 120 is circularly polarized light capable of reflecting one of the first reflective pigment 121 (not shown in FIG. 10) and the second reflective pigment 122 (not shown in FIG. 10). , Do not contain or contain only a small amount. Therefore, all or most of the light LT17 that has entered the first reflective layer 120 is not reflected by one of the first reflective pigment 121 and the second reflective pigment 122, and the first reflective pigment 121 and the second reflective pigment 122 are not reflected. Reflected by the other of.
  • the hue of the reflected light LR18 on the first reflective layer 120 is the other hue of the first reflective pigment 121 and the second reflective pigment 122. Further, among the light L T17 which enters the first reflective layer 120, the light L T18 other than the reflected light L R18 exits to the outside of the display medium 200 passes through the first reflective layer 120. Some or all of the light L T18 leaving the display medium 200, like the area where the first reflective layer 120 and the second reflective layer 130 is not provided, so the rotation direction D A reverse rotation direction of the circularly polarized light There is.
  • the irradiation light L I4 enters the second reflective layer 130. Since the irradiation light LI4 is reflected by the first reflective pigment 131 (not shown in FIG. 10) and the second reflective pigment 132 (not shown in FIG. 10), the reflected light LR19 of the second reflective layer 130 The hue is a mixture of the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132.
  • the light L T19 other than the reflected light L R19 reflected by the second reflective layer 130 is transmitted through the retardation layer 212 of the substrate 210 enters the polarization separation layer 111.
  • a part of the light LT19 that has entered is reflected by the polarization separation layer 111 as circularly polarized light LR20 in the rotation direction DA, and the rotation direction is reversed by passing through the retardation layer 212.
  • Light L T20 other than circularly polarized light L R20 reflected is transmitted through the polarization separating layer 111, exiting to the outside of the display medium 200.
  • Some or all of the light L T20 leaving the display medium 200 like the area where the first reflective layer 120 and the second reflective layer 130 is not provided, so the rotation direction D A reverse rotation direction of the circularly polarized light There is.
  • the observer observes the first reflection as shown in FIG.
  • the layer 120 and the second reflective layer 130 can be visually recognized.
  • the observer visually recognizes the first reflective layer 120 which is colored in one of the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122.
  • the first reflective layer 120 specifically, the direction of rotation D A develops color hue of the reflection pigments which can reflect circularly polarized light of the opposite rotational direction.
  • the observer visually recognizes the second reflective layer 130 which is colored by mixing the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132.
  • the display medium 200 when the irradiation light L I3 is irradiated to the first reflective layer 120 side of the display medium 200, as shown in FIG. 9, the second reflective layer 130, the direction of rotation D A It develops a hue of a reflective pigment that can reflect circularly polarized light in the "same" rotation direction.
  • the second reflective layer 130 in the case where the irradiation light L I1 is irradiated similarly to the rotation direction D A reflective pigments which can reflect circularly polarized light in the "reverse" direction of rotation It is different from the first embodiment in which the hue is colored.
  • the display medium 200 is light that passes through the display medium 200 and exits when the irradiation light LI3 is irradiated on the first reflective layer 120 side of the display medium 200 as shown in FIG. some or all of the L T11, L T13 and L T15 has a circular polarization in the direction of rotation D a and "same" direction of rotation.
  • a part or all of the lights LT1 , LT3, and LT5 that are transmitted through the display medium 100 and exit when the irradiation light LI1 is irradiated is rotated. differs from the first embodiment was in the direction D a and circularly polarized light of the "reverse" direction of rotation.
  • the display medium 200 according to the second embodiment it is possible to realize a display mode different from the display medium 100 described in the first embodiment by utilizing the difference from the first embodiment as described above. .. Further, according to the display medium 200 according to the second embodiment, the same advantages as described in the first embodiment can be obtained.
  • the display medium is not limited to that described in the first embodiment and the second embodiment described above.
  • the display media 100 and 200 including the first reflective layer 120 and the second reflective layer 130 in combination are shown, but only one of the first reflective layer 120 and the second reflective layer 130 is used as the display medium. May be provided.
  • the display medium may further include any element in combination with the above-mentioned base materials 110 and 210 and a reflective layer such as the first reflective layer 120 and the second reflective layer 130.
  • the display medium may be provided with an arbitrary layer having a circular polarization separation function on the surface of the base material in addition to the first reflection layer 120 and the second reflection layer 130.
  • any layer may be provided that includes one of the first reflective pigment 121 and the second reflective pigment 122 and does not include the other.
  • the display medium may be provided with an arbitrary non-chiral layer containing a colorant such as a pigment and a dye having no circular polarization separation function on the surface of the base material.
  • This non-chiral layer can usually be visually recognized both when observed from the front surface and when observed from the back surface.
  • the display medium may include an adhesive layer for adhering the above-mentioned layers to each other.
  • the display medium may have an adhesive layer between the base material and the first reflective layer, or may have an adhesive layer between the base material and the second reflective layer.
  • the adhesive layer preferably has a small in-plane retardation, like any layer that the substrates 110 and 210 can have.
  • the display medium may include a cover layer that protects each of the above-mentioned layers. It is preferable that these cover layers are provided outside the above-mentioned layers.
  • the display medium may include a cover layer, a second reflective layer, a base material, a first reflective layer, and a cover layer in this order in the thickness direction.
  • a cover layer can be formed of a transparent material, for example, a resin.
  • the display medium may include any layer having a small in-plane retardation between the above-mentioned layers and as the outermost layer of the display medium as long as the effect of the present invention is not significantly impaired.
  • Any layer having such a small in-plane retardation may be hereinafter referred to as a "low Re layer".
  • the specific in-plane retardation of this low Re layer is usually 0 nm or more and 5 nm or less.
  • the position where the low Re layer is provided is, for example, the position opposite to the base material of the first reflective layer, the position between the first reflective layer and the base material, and the position between the polarizing separation layer and the retardation layer.
  • the low Re layer preferably has high light transmittance, and the total light transmittance of the low Re layer is preferably 80% or more, more preferably 85% or more.
  • Examples of such a low Re layer material include hard polyvinyl chloride, soft polyvinyl chloride, acrylic resin, glass, polycarbonate (PC), polyethylene terephthalate (PET), and the like.
  • the specific material can be appropriately selected according to the application of the display medium, the required texture, durability, and mechanical strength.
  • the display medium described above can be used as a display set in combination with a display article for observation through the display medium.
  • the display article to be combined with the display medium includes a base article and a display layer provided on the base article.
  • Display layer reflects circularly polarized light of one direction of rotation D D clockwise and counterclockwise, the display pigment capable of transmitting circularly polarized light in the direction of rotation of the opposite, including.
  • FIG. 11 is a cross-sectional view schematically showing the display set 300 according to the third embodiment of the present invention.
  • the display set 300 according to the third embodiment of the present invention includes a display medium 100 and a display article 400.
  • the display set 300 including the display medium 100 described in the first embodiment will be described as an example.
  • FIG. 12 is a cross-sectional view schematically showing a display article 400 included in the display set 300 according to the third embodiment of the present invention.
  • FIG. 13 is a plan view schematically showing the display article 400 included in the display set 300 according to the third embodiment of the present invention.
  • the display article 400 includes a base article 410 and a first display layer 420, a second display layer 430, and a third display layer 440 as display layers provided on the base article 410. To be equipped.
  • the base article 410 is an article provided with display layers such as the first display layer 420, the second display layer 430, and the third display layer 440, and the range thereof is not limited.
  • Examples of the base article 410 include cloth products such as clothing; leather products such as bags and shoes; metal products such as screws; paper products such as price tags; plastic products such as cards and plastic banknotes; rubber products such as tires; Examples include, but are not limited to, these examples.
  • the first display layer 420, the second display layer 430, and the third display layer 440 as the display layer all include a display pigment having a circular polarization separation function.
  • Display pigment in the wavelength range capable of exhibiting the circularly polarized light separation function reflects circularly polarized light of one rotational direction D D, and the direction of rotation D D can transmit circularly polarized light of the opposite rotational direction.
  • the wavelength range in which the display pigment can exert the circular polarization separation function may be appropriately referred to as “display wavelength range”.
  • the display wavelength range of the display pigment usually overlaps with the polarization separation wavelength range of the polarization separation layer 111 included in the base material 110 of the display medium 100.
  • a part of the display wavelength range and a part of the polarization separation wavelength range may overlap, or the whole display wavelength range and a part of the polarization separation wavelength range may overlap, and one of the display wavelength ranges.
  • the unit and the entire polarization separation wavelength range may overlap, or the entire display wavelength range and the entire polarization separation wavelength range may overlap.
  • the type of display pigment can be selected so that the display pigment can reflect circularly polarized light having a desired hue.
  • the arrangement and amount of the display pigment in each display layer can be appropriately set so that the display layer having a desired design and hue can be visually recognized during observation.
  • the display layer may include a combination of the first display pigment 421 and the second display pigment 422 having different rotation directions and hues, such as the first display layer 420.
  • the first display pigment 421 in the wavelength range capable of exhibiting the circularly polarized light separation function, it reflects circularly polarized light of one rotational direction D DR, the direction of rotation D DR opposite rotational direction of the circularly polarized light Can be made transparent.
  • the second display pigment 422 reflects the circular polarization of one rotation direction D DL in the display wavelength range in which the circular polarization separation function can be exhibited, and transmits the circular polarization in the rotation direction opposite to the rotation direction D DL. Can be made to.
  • the rotation direction DDR of the circular polarization that can reflect these first display pigments 421 and the rotation direction D DL of the circular polarization that can reflect the second display pigment 422 are opposite. Further, the hue of the first display pigment 421 (that is, the hue of the circular polarization that the first display pigment 421 can reflect) and the hue of the second display pigment 422 (that is, the hue of the circular polarization that the second display pigment 422 can reflect). Is different.
  • the display layer for example, as in the second display layer 430, the circular polarization of the same direction of rotation D D3 polarization separating layer 111 included in the substrate 110 of the display medium 100 and the rotation direction D A circularly polarized light can be reflected It may contain a third display pigment 431 that can reflect and transmit circularly polarized light in the direction of rotation opposite to the direction of rotation D D3.
  • the display layer for example as in the third display layer 440, the circle of the reverse rotational direction D D4 to the rotation direction D A of the circularly polarized light can reflect the polarization separating layer 111 included in the substrate 110 of the display medium 100 It may contain a fourth display pigment 441 that can reflect polarized light and transmit circularly polarized light in a rotation direction opposite to the rotation direction D D4.
  • one display pigment such as the first display pigment 421, the second display pigment 422, the third display pigment 431, and the fourth display pigment 441 are shown, but usually, the first display pigment is shown.
  • the display layer 420, the second display layer 430, and the third display layer 440 may contain a plurality of each display pigment.
  • Examples of the display pigments such as the first display pigment 421, the second display pigment 422, the third display pigment 431 and the fourth display pigment 441 include the first reflection pigments 121 and 131 and the second reflection pigments 122 and 132.
  • the same as the reflective pigment such as, etc. can be used. Therefore, the display layers such as the first display layer 420, the second display layer 430, and the third display layer 440 are formed as layers containing flakes of cholesteric resin, like the first reflection layer 120 described in the first embodiment. Can be done.
  • the third display layer 440 having a shape and the display article 400 provided on the sheet-shaped base article 410 will be described as an example.
  • the display set 300 has a combination of the display medium 100 and the display article 400 having the above-described configuration. Therefore, an observer observing such a display set 300 can visually recognize the image described below.
  • the observer usually observes the display set 300 from above in the figure. Therefore, the observer observes the display medium 100 from the first reflective layer 120 side, and at the same time, observes the display article 400 through the display medium 100.
  • FIG. 14 is a plan view schematically showing an image visually recognized when the display set 300 shown in FIG. 11 is observed from above in the drawing.
  • the image visually recognized by the observer who observes the display set 300 as described above includes the first reflective layer 120 and the second reflective layer 130 of the display medium 100, and the first of the display article 400.
  • the display layer 420 and the third display layer 440 appear, but the second display layer 430 of the display article 400 does not appear.
  • the first reflective layer 120 is colored by a mixture of the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122
  • the second reflective layer 130 is the first reflective pigment 131.
  • the first display layer 420 is colored in one of the hues of the first display pigment 421 and the second display pigment 422.
  • the third display layer 440 is colored in the hue of the fourth display pigment 441.
  • the mechanism by which such an image is visually recognized is as follows.
  • the first display layer 420 of the display article 400 includes a first display pigments 421 that can reflect circularly polarized light in the direction of rotation D DR, second display that can reflect circularly polarized light of the opposite rotational direction D DL to the direction of rotation D DR Includes in combination with pigment 422. Therefore, all or most of the light that has passed through the display medium 100 and entered the first display layer 420 is not reflected by one of the first display pigment 421 and the second display pigment 422, and the first display pigment 421 and the first display pigment 421 and the second display pigment 422 are not reflected. It is reflected by the other of the second display pigment 422.
  • hue one of the hue (normal hue and the second display pigment 422 of the first display pigments 421, of the first display pigment 421 and second display pigments 422, opposite to the rotational direction D A
  • the first display layer 420 colored on the display pigment (hue of the display pigment capable of reflecting the circular polarization in the rotation direction) can be visually recognized.
  • the second display layer 430 of the display article 400 is to reflect circularly polarized light in the same rotational direction D D3 and the direction of rotation D A, it is possible to transmit circularly polarized light of the opposite rotational direction and the rotational direction D D3 Includes third display pigment 431. Therefore, all or most of the light that has passed through the display medium 100 and entered the second display layer 430 is not reflected by the second display layer 430 or is weakly reflected. Further, even if the second display layer 430 reflecting light occurs, light reflected thereof are the circularly polarized light having the same direction of rotation D D3 and the direction of rotation D A, in the polarization separating layer 111 of the display medium 100 one Part or all is reflected. Therefore, since there is no or weak light that can be reflected by the second display layer 430 and transmitted through the display medium 100, the observer cannot visually recognize the image of the second display layer 430.
  • the third display layer 440 of the display article 400 is to reflect circularly polarized light of the opposite rotational direction D D4 to the rotation direction D A, it transmits a circularly polarized light of reverse rotation direction to the rotation direction D D4
  • a fourth display pigment 441 capable of producing. Therefore, all or most of the light that has passed through the display medium 100 and entered the third display layer 440 causes a large reflection at the third display layer 440. Since the reflected light is circularly polarized light in the rotation direction D D4 opposite to the rotation direction D A, it can pass through the polarization separation layer 111 of the display medium 100 and be visually recognized by the observer. Therefore, the observer can visually recognize the third display layer 440 colored in the hue of the fourth display pigment 441.
  • the observer can see the hue of the first reflective pigment 121 as described in the first embodiment.
  • the first reflective layer 120 which is colored by mixing with the hue of the second reflective pigment 122, can be visually recognized.
  • the second reflective layer 130 of the display medium 100 is observed by the observer through the base material 110, the observer observes the hue and the second reflection of the first reflective pigment 131 as described in the first embodiment.
  • the second reflective layer 130 colored in one of the hues of the pigment 132 can be visually recognized.
  • the observer can see the image (letter "B") of the first reflective layer 120 colored by mixing the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122.
  • the image of the second reflective layer 130 (letter “E") colored in one of the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132, the hue of the first display pigment 421 and the hue of the second display pigment 422.
  • An image of the first display layer 420 (letter “M”) colored in one of the hues and an image of the third display layer 440 (letter "I”) colored in the hue of the fourth display pigment 441. Visible.
  • FIG. 15 is a cross-sectional view schematically showing the display set 300 according to the third embodiment of the present invention.
  • the observer when the display medium 100 and the display article 400 are overlapped with each other in a direction in which the display medium 100 faces the display article 400 on the first reflective layer 120 side, the observer usually views the display medium 100 from above in the drawing. Observe the display set 300. Therefore, the observer observes the display medium 100 from the second reflective layer 130 side, and at the same time, observes the display article 400 through the display medium 100.
  • FIG. 16 is a plan view schematically showing an image visually recognized when the display set 300 shown in FIG. 15 is observed from above in the drawing.
  • the image visually recognized by the observer who observes the display set 300 as described above includes the first reflective layer 120 and the second reflective layer 130 of the display medium 100, and the first of the display article 400.
  • the display layer 420 and the third display layer 440 appear, but the second display layer 430 of the display article 400 does not appear.
  • the first reflective layer 120 is colored in one of the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122
  • the second reflective layer 130 is the first reflective pigment.
  • the hue of 131 and the hue of the second reflective pigment 132 are mixed, and the first display layer 420 is colored in one of the hue of the first display pigment 421 and the hue of the second display pigment 422.
  • the third display layer 440 is colored in the hue of the fourth display pigment 441.
  • all or most of the light transmitted through the display medium 100 and entering the first display layer 420 is one of the first display pigment 421 and the second display pigment 422. Is not reflected, but is reflected by the other of the first display pigment 421 and the second display pigment 422. Therefore, the observer can visually recognize the first display layer 420 colored in one of the hue of the first display pigment 421 and the hue of the second display pigment 422.
  • the observer since the first reflective layer 120 of the display medium 100 is observed by the observer through the base material 110, the observer observes the hue and the second reflection of the first reflective pigment 121 as described in the first embodiment.
  • the first reflective layer 120 colored in one of the hues of the pigment 122 can be visually recognized.
  • the second reflective layer 130 of the display medium 100 is observed by the observer without passing through the base material 110, the observer can see the hue of the first reflective pigment 131 as described in the first embodiment.
  • the second reflective layer 130 which is colored by mixing with the hue of the second reflective pigment 132, can be visually recognized.
  • the observer has an image of the first reflective layer 120 (letter “B”) colored in one of the hues of the first reflective pigment 121 and the second reflective pigment 122.
  • the image of the second reflective layer 130 (letter “E”) colored by mixing the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132, the hue of the first display pigment 421 and the second display pigment 422.
  • An image of the first display layer 420 (letter “M”) colored in one of the hues and an image of the third display layer 440 (letter "I”) colored in the hue of the fourth display pigment 441. Visible.
  • the image visually recognized can be different depending on the orientation of the display medium 100. Therefore, by combining different images in this way, it is possible to realize a new display mode that has not existed in the past, and it is possible to create a complicated and highly flexible design.
  • the base material 110 of the display medium 100 is transparent or translucent, but the image is displayed as described above depending on the orientation of the display medium 100. Since the difference can be a display that is unexpected to a general observer, it can be expected to have a great impact on the observer.
  • the display article 400 including the first display layer 420, the second display layer 430, and the third display layer 440 in combination has been described as an example, but the first display layer 420 and the second display have been described.
  • Display articles comprising at least one of layer 430 and third display layer 440 may be used.
  • the display article 400 may include a non-chiral layer provided on the underlying article 410.
  • a display set may be obtained by combining the display medium including the retardation layer and the display article.
  • the display set including a display medium including a phase difference layer usually, a part or the whole of the circular polarization direction of rotation D D reflected by the display layer of the display article
  • the substrate of the display medium the following (i) and (Ii) can be transmitted in one order, and cannot be transmitted in the other order.
  • the order of the polarization separation layer and the retardation layer (Ii) The order of the retardation layer and the polarization separation layer.
  • the function of the display medium is utilized in a manner different from that described in the third embodiment, depending on the orientation of the front and back of the display medium.
  • the visible image of the displayed article can be different.
  • FIG. 17 is a cross-sectional view schematically showing the display set 500 according to the fourth embodiment of the present invention.
  • the display set 500 according to the fourth embodiment of the present invention includes a display medium 200 and a display article 400.
  • a display set 500 including the display medium 200 described in the second embodiment and the display article 400 described in the third embodiment will be described as an example. An observer observing such a display set 500 can visually recognize the image described below.
  • the observer usually observes the display set 500 from above in the figure. Therefore, the observer observes the display medium 200 from the first reflective layer 120 side, and at the same time, observes the display article 400 through the display medium 200.
  • FIG. 18 is a plan view schematically showing an image visually recognized when the display set 500 shown in FIG. 17 is observed from above in the drawing.
  • the image visually recognized by the observer who observes the display set 500 as described above includes the first reflective layer 120 and the second reflective layer 130 of the display medium 200, and the first of the display article 400.
  • the display layer 420 and the second display layer 430 appear, but the third display layer 440 of the display article 400 does not appear.
  • the first reflective layer 120 is colored by a mixture of the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122
  • the second reflective layer 130 is the first reflective pigment 131.
  • the first display layer 420 is colored in one of the hues of the first display pigment 421 and the second display pigment 422.
  • the second display layer 430 is colored in the hue of the third display pigment 431.
  • the mechanism by which such an image is visually recognized is as follows.
  • the polarizing separation layer 111, the retardation layer 212, and the display article 400 are arranged in this order in the thickness direction of the display medium 200. Therefore, the irradiation light irradiated to the display medium 200 enters the display article 400 after a part of the circularly polarized light is reflected by the polarization separating layer 111 and the light other than the reflected circularly polarized light passes through the retardation layer 212. To do. Some or all of the light entering into such display article 400, and has a to be circularly polarized light in the direction of rotation D A circularly polarized light in the same rotational direction reflected by the polarization separating layer 111 (light L T11 in FIG. 9 , LT13 and LT15 ).
  • the first display layer 420 of the display article 400 includes a first display pigments 421 that can reflect circularly polarized light in the direction of rotation D DR, second display that can reflect circularly polarized light of the opposite rotational direction D DL to the direction of rotation D DR Includes in combination with pigment 422. Therefore, all or most of the light transmitted through the display medium 200 and entering the first display layer 420 is not reflected by one of the first display pigment 421 and the second display pigment 422, and the first display pigment 421 and the first display pigment 421 and the second display pigment 422 are not reflected. It is reflected by the other of the second display pigment 422.
  • hue one of the hue (normal hue and the second display pigment 422 of the first display pigments 421, of the first display pigment 421 and second display pigments 422, the same rotation as the rotational direction D A
  • the first display layer 420 colored on the display pigment (hue of the display pigment that can reflect the circular polarization in the direction) can be visually recognized.
  • the second display layer 430 of the display article 400 is to reflect circularly polarized light in the same rotational direction D D3 and the direction of rotation D A, it is possible to transmit circularly polarized light of the opposite rotational direction and the rotational direction D D3 Includes third display pigment 431. Therefore, all or most of the light that has passed through the display medium 200 and entered the second display layer 430 causes large reflection at the second display layer 430. Then, the light the reflection are the circularly polarized light having the same direction of rotation D D3 and the direction of rotation D A, the direction of rotation is reversed by passing through the retardation layer 212 of the display medium 200, the polarization separating layer 111 It is transparent and can be seen by the observer. Therefore, the observer can visually recognize the second display layer 430 colored in the hue of the third display pigment 431.
  • the third display layer 440 of the display article 400 is to reflect circularly polarized light of the opposite rotational direction D D4 to the rotation direction D A, it transmits a circularly polarized light of reverse rotation direction to the rotation direction D D4 Includes a fourth display pigment 441 capable of producing. Therefore, all or most of the light that has passed through the display medium 200 and entered the third display layer 440 is not reflected by the third display layer 440 or is weakly reflected.
  • the reflected light is circularly polarized light in the rotation direction D D4 opposite to the rotation direction D A , so that the retardation layer 212 of the display medium 200
  • the direction of rotation is reversed by transmitting the light, and part or all of the light is reflected by the polarization separation layer 111. Therefore, since there is no or weak light that can be reflected by the third display layer 440 and transmitted through the display medium 200, the observer cannot visually recognize the image of the third display layer 440.
  • the observer can see the hue of the first reflective pigment 121 as described in the second embodiment.
  • the first reflective layer 120 which is colored by mixing with the hue of the second reflective pigment 122, can be visually recognized.
  • the second reflective layer 130 of the display medium 200 is observed by the observer through the base material 210, the observer observes the hue and the second reflection of the first reflective pigment 131 as described in the second embodiment.
  • the second reflective layer 130 colored in one of the hues of the pigment 132 can be visually recognized.
  • the observer can see the image (letter "B") of the first reflective layer 120 colored by mixing the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122.
  • the image of the second reflective layer 130 (letter “E") colored in one of the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132, the hue of the first display pigment 421 and the hue of the second display pigment 422.
  • An image of the first display layer 420 (letter "M”) colored in one of the hues and an image of the second display layer 430 (letter "S”) colored in the hue of the third display pigment 431 are displayed. Visible.
  • FIG. 19 is a cross-sectional view schematically showing a display set 500 according to a fourth embodiment of the present invention.
  • the observer when the display medium 200 and the display article 400 are overlapped with each other in a direction in which the display medium 200 faces the display article 400 on the first reflective layer 120 side, the observer usually views the display medium 200 from above in the drawing. Observe the display set 500. Therefore, the observer observes the display medium 200 from the second reflective layer 130 side, and at the same time, observes the display article 400 through the display medium 200.
  • FIG. 20 is a plan view schematically showing an image visually recognized when the display set 500 shown in FIG. 19 is observed from above in the drawing.
  • the image visually recognized by the observer who observes the display set 500 as described above includes the first reflective layer 120 and the second reflective layer 130 of the display medium 200, and the first of the display article 400.
  • the display layer 420 and the third display layer 440 appear, but the second display layer 430 of the display article 400 does not appear.
  • the first reflective layer 120 is colored in one of the hue of the first reflective pigment 121 and the hue of the second reflective pigment 122
  • the second reflective layer 130 is the first reflective pigment.
  • the hue of 131 and the hue of the second reflective pigment 132 are mixed, and the first display layer 420 is colored in one of the hue of the first display pigment 421 and the hue of the second display pigment 422.
  • the third display layer 440 is colored in the hue of the fourth display pigment 441.
  • the retardation layer 212, the polarization separation layer 111, and the display article 400 are arranged in this order in the thickness direction of the display medium 200. Therefore, the irradiation light irradiated to the display medium 200 passes through the retardation layer 212, and after a part of the circular polarization is reflected by the polarization separation layer 111, it enters the display article 400. Thus some of the light that enters the display article 400 or all the light of the polarization and direction of rotation D A circularly polarized light reflected at the separation layer 111 has a reverse rotational direction of the circularly polarized light (FIG. 10 See LT16 , LT18 and LT20 ).
  • all or most of the light transmitted through the display medium 200 and entering the first display layer 420 is not reflected by one of the first display pigment 421 and the second display pigment 422, and the first display pigment 421 and the first display pigment 421 and the second display pigment 422 are not reflected. It is reflected by the other of the second display pigment 422. Specifically, all or most of the light entering the first display layer 420 of the first display pigment 421 and second display pigments 422, reflect circularly polarized light of the opposite rotational direction to the rotation direction D A It is reflected by the display pigment that can be used.
  • hue one of the hue (normal hue and the second display pigment 422 of the first display pigments 421, of the first display pigment 421 and second display pigments 422, opposite to the rotational direction D A
  • the first display layer 420 colored on the display pigment (hue of the display pigment capable of reflecting the circular polarization in the rotation direction) can be visually recognized.
  • the second display layer 430 of the display article 400 is to reflect circularly polarized light in the same rotational direction D D3 and the direction of rotation D A, it is possible to transmit circularly polarized light of the opposite rotational direction and the rotational direction D D3 Includes third display pigment 431. Therefore, all or most of the light that has passed through the display medium 200 and entered the second display layer 430 is not reflected by the second display layer 430 or is weakly reflected. Further, even if the second display layer 430 reflecting light occurs, light reflected thereof are the circularly polarized light having the same direction of rotation D D3 and the direction of rotation D A, in the polarization separating layer 111 of the display medium 200 one Part or all is reflected. Therefore, since there is no or weak light that can be reflected by the second display layer 430 and transmitted through the display medium 200, the observer cannot visually recognize the image of the second display layer 430.
  • the third display layer 440 of the display article 400 is to reflect circularly polarized light of the opposite rotational direction D D4 to the rotation direction D A, it transmits a circularly polarized light of reverse rotation direction to the rotation direction D D4 Includes a fourth display pigment 441 capable of producing. Therefore, all or most of the light that has passed through the display medium 200 and entered the third display layer 440 causes a large reflection at the third display layer 440. Since the reflected light is circularly polarized light in the rotation direction D D4 opposite to the rotation direction D A, it is transmitted through the polarization separation layer 111 of the display medium 200 and further transmitted through the retardation layer 212 for observation. Can be visually recognized by a person. Therefore, the observer can visually recognize the third display layer 440 colored in the hue of the fourth display pigment 441.
  • the observer since the first reflective layer 120 of the display medium 200 is observed by the observer through the base material 210, the observer observes the hue and the second reflection of the first reflective pigment 121 as described in the second embodiment.
  • the first reflective layer 120 colored in one of the hues of the pigment 122 can be visually recognized.
  • the second reflective layer 130 of the display medium 200 is observed by the observer without passing through the base material 210, the observer can see the hue of the first reflective pigment 131 as described in the second embodiment.
  • the second reflective layer 130 which is colored by mixing with the hue of the second reflective pigment 132, can be visually recognized.
  • the observer has an image of the first reflective layer 120 (letter “B”) colored in one of the hues of the first reflective pigment 121 and the second reflective pigment 122.
  • the image of the second reflective layer 130 (letter “E”) colored by mixing the hue of the first reflective pigment 131 and the hue of the second reflective pigment 132, the hue of the first display pigment 421 and the second display pigment 422.
  • An image of the first display layer 420 (letter “M”) colored in one of the hues and an image of the third display layer 440 (letter "I”) colored in the hue of the fourth display pigment 441. Visible.
  • the image visually recognized can be different depending on the orientation of the display medium 200.
  • the images of the first display layer 420 of the display article 400 observed and visually recognized from the first reflective layer 120 side of the display medium 200 are the first display pigment 421 and the second display pigment 421. While exhibiting one hue of the display pigment 422, the image of the first display layer 420 of the display article 400 observed and visually recognized from the second reflective layer 130 side of the display medium 200 is the first display pigment 421 and the first display pigment 421. It exhibits the other hue of the bilabel pigment 422.
  • the hue of the first display layer 420 to be visually recognized is the hue of the first display pigment 421 and the hue of the second display pigment 422 according to the orientation of the display medium 200. You can switch between.
  • the second display layer 430 appears in the image of the display article 400 observed and visually recognized from the first reflective layer 120 side of the display medium 200, while the third display layer 430 appears. While 440 does not appear, in the image of the display article 400 observed and visually recognized from the second reflective layer 130 side of the display medium 200, the second display layer 430 does not appear, while the third display layer 440 appears. ..
  • the visible display layer can be switched between the second display layer 430 and the third display layer 440 according to the orientation of the display medium 200.
  • the display set 500 according to the fourth embodiment can obtain the same advantages as the display set 300 according to the third embodiment, and is more complicated and free than the display set 300 according to the third embodiment. It is possible to create a design with a high degree of freedom.
  • the display set 500 according to the fourth embodiment may be modified and implemented in the same manner as the display set 300 according to the third embodiment. Further, in the display set 500 according to the fourth embodiment, the display medium 200 does not have to be provided with reflective layers such as the first reflective layer 120 and the second reflective layer 130.
  • a peak having a maximum intensity of 35% to 50% as the maximum reflectance was identified. Then, the base showing the minimum intensity of the reflection spectrum and the peak top of the peak showing the maximum intensity are specified, and the wavelength range showing the intensity of "minimum intensity + (maximum intensity-minimum intensity) / 2" or more is set as a circle. It was obtained as a wavelength range in which the polarization separation function can be exhibited. Further, the average value (( ⁇ 1 + ⁇ 2) / 2) of the minimum wavelength ⁇ 1 and the maximum wavelength ⁇ 2 in this wavelength range was calculated as the center wavelength of the wavelength range. Further, the difference between the minimum wavelength ⁇ 1 and the maximum wavelength ⁇ 2 in this wavelength range was calculated as the wavelength width of the wavelength range.
  • a layer of cholesteric resin for producing a pigment is irradiated with non-polarized light, and the reflected light is observed through a right circular polarizing plate and a left circular polarizing plate, and the reflected light is either right circularly polarized light or left circularly polarized light. Identified whether it is.
  • the reflected light of the pigment was right-handed circularly polarized light, it was determined that the twisting direction of the cholesteric resin contained in the pigment was right-handed twisting.
  • the reflected light of the pigment was left-handed circularly polarized light, it was determined that the twisting direction of the cholesteric resin contained in the pigment was left-handed twisting.
  • the in-plane retardation was measured at a measurement wavelength of 590 nm using a phase difference meter (“Axoscan” manufactured by Axometrics).
  • a support film As a support film, a long polyethylene terephthalate film ("A4100" manufactured by Toyobo Co., Ltd .; thickness 100 ⁇ m) was prepared. This support film was attached to the feeding portion of the film transport device, and the following operations were performed while transporting the support film in the elongated direction.
  • A4100 polyethylene terephthalate film manufactured by Toyobo Co., Ltd .; thickness 100 ⁇ m
  • the surface of the support film was subjected to a rubbing treatment in a long direction parallel to the transport direction.
  • the liquid crystal composition was applied to the surface of the rubbing-treated support film using a die coater to form a layer of the liquid crystal composition.
  • the layer of the liquid crystal composition was subjected to an orientation treatment by heating at 120 ° C. for 4 minutes.
  • the layer of the liquid crystal composition was subjected to a broadband treatment.
  • the reflection band was controlled to a desired bandwidth by alternately repeating weak ultraviolet irradiation of 5 mJ / cm 2 to 30 mJ / cm 2 and heating treatment of 100 ° C. to 120 ° C. a plurality of times.
  • the layer of the liquid crystal composition was irradiated with ultraviolet rays of 800 mJ / cm 2 to cure the layer of the liquid crystal composition.
  • a multi-layer film including a support film and a layer of cholesteric resin was obtained.
  • the polarization separation wavelength range in which the cholesteric resin layer of this multi-layer film can exhibit the circular polarization separation function was measured by the above-mentioned measuring method.
  • the cholesteric resin layer had a polarization separation wavelength range in which the maximum reflectance with respect to unpolarized light was 40% or more in the wavelength range from 450 nm to 700 nm.
  • a support film As a support film, a polyethylene terephthalate (PET) film ("Cosmo Shine (registered trademark) A4100" manufactured by Toyobo Co., Ltd., thickness 100 ⁇ m) was prepared, and one side was rubbed. The liquid crystal composition was applied onto the rubbing-treated surface of the support film to form a layer of the liquid crystal composition. The coating liquid was applied by using a die coater to adjust the discharge amount so that the film thickness of the liquid crystal composition layer before drying was 15 ⁇ m.
  • PET polyethylene terephthalate
  • the layer of the liquid crystal composition formed on the support film was heated in an oven at 140 ° C. for 2 minutes to perform a drying treatment and an orientation treatment.
  • ultraviolet rays were irradiated from the layer side of the liquid crystal composition using a high-pressure mercury lamp to cure the layer of the liquid crystal composition.
  • a multi-layer film including a support film and a layer of cholesteric resin was obtained.
  • the thickness of the cholesteric resin layer was 3 ⁇ m.
  • the wavelength range in which the cholesteric resin layer thus obtained can exhibit the circular polarization separation function and the twisting direction of the cholesteric resin were measured by the above-mentioned measuring method.
  • the cholesteric resin layer was peeled off from the support film and crushed to obtain cholesteric resin flakes.
  • the obtained flakes were classified using a sieve, and only the flakes that passed through the sieve were recovered to obtain pigments IV to V.
  • the average particle size and hue of each pigment thus obtained were evaluated by the method described above. The results are shown in Table 1 below.
  • the "center wavelength”, [wavelength range], and “width of wavelength range” are the center wavelength of the wavelength range in which the pigment can exert the circular polarization separation function, respectively, and the pigment can exert the circular polarization separation function. It represents the wavelength range and the width of the wavelength range in which the pigment can exert the circular polarization separation function.
  • FIG. 21 is a cross-sectional view schematically showing the display set 1 manufactured in the first embodiment.
  • the display set 1 manufactured in the first embodiment includes the display medium 10 and the display article 20.
  • the display medium 10 is a base material 12 provided with a polarizing separation layer 11; a character layer B (R, G) as a first reflective layer provided on the first surface 12U of the base material 12, and a second base material 12.
  • a character layer E (G, R) as a second reflective layer provided on the surface 12D is provided.
  • the display medium 10 produced in Example 1 contained a support layer and an adhesive, but these are not shown in FIG. 21.
  • the display article 20 includes the base article 21; and the character layer M (B, R) , the character layer S (G, R), and the character layer I (R, G) as the display layer provided on the base article 21. ) Is provided.
  • the display set 1 a method of manufacturing the display set 1 will be described.
  • the character “B” was printed on the first surface 12U of the base material 12 with the ink RG produced in Production Example 4, and dried to form the character layer B (R, G) as the first reflective layer. Further, the character “E” was printed on the second surface 12D of the base material 12 with the ink GR produced in Production Example 5, and dried to form the character layer E (G, R) as the second reflective layer. .. As a result, a display medium 10 including the character layer B (R, G) , the polarizing separation layer 11, and the character layer E (G, R) in this order in the thickness direction was obtained.
  • the character "M” was printed on one side of a black resin sheet with the ink BR produced in Production Example 6 and dried to form a character layer M (B, R) as a display layer. Further, the character “S” was printed on one side of the black sheet with the ink GR produced in Production Example 5 and dried to form the character layer S (G, R) as a display layer. Further, the character “I” was printed on one side of the black sheet with the ink RG produced in Production Example 4, and dried to form the character layer I (R, G) as a display layer. As a result, a display article 20 having a character layer M (B, R) , a character layer S (G, R), and a character layer I (R, G) on one side of the base article 21 as a black sheet was obtained.
  • the display article 20 is arranged in a table (not shown ) so that the character layer M (B, R) , the character layer S (G, R), and the character layer I (R, G) face upward. ) Put it on.
  • the display medium 10 was placed on the display article 20 with the character layer B (R, G) side facing up.
  • the display set 1 composed of the display medium 10 and the display article 20 was observed from above under non-polarized illumination.
  • the character layer B (R, G) is yellow
  • the character layer E (G, R) is red
  • the character layer M (B, R) is red
  • the character layer S (G, R) is red
  • the character layer. I (R, G) was visually recognized in green.
  • the display medium 10 was turned over and placed on the display article 20, and the display set 1 was observed again.
  • the character layer B (R, G) is green
  • the character layer E (G, R) is yellow
  • the character layer M (B, R) is red
  • the character layer S (G, R) is red
  • the character layer. I (R, G) was visually recognized in green.
  • Example 2 The results of Example 1 are summarized in Table 2 below.
  • FIG. 22 is a cross-sectional view schematically showing the display set 2 manufactured in the second embodiment.
  • the display set 2 manufactured in the second embodiment includes the display medium 30 and the display article 20.
  • the display article 20 is the same as that of the first embodiment.
  • the display medium 30 is the same as the display medium 10 of the first embodiment except that the base material 14 having the retardation layer 13 is provided in place of the base material 12.
  • the display medium 30 produced in Example 2 contained a support layer and an adhesive, but those are not shown in FIG. 22.
  • the display medium 30 was manufactured by the following procedure.
  • the cholesteric resin layer of the multilayer film produced in Production Example 1 and an optically isotropic film (polyvinyl chloride film) were bonded to each other via an adhesive, and the supporting film of the multilayer film was peeled off.
  • the surface of the cholesteric resin layer that appeared by peeling off the support film and the retardation film produced in Production Example 2 were bonded to each other via an adhesive.
  • a base material 14 including the retardation layer 13 as a retardation film and the retardation layer 13 as a retardation film was obtained in this order.
  • the character “B” is printed on the first surface 14U of the base material 14 as the surface on the polarization separation layer side with the ink RG produced in Production Example 4, dried, and the character layer B (R) as the first reflective layer is printed. , G) was formed. Further, the character “E” is printed on the second surface 14D of the base material 14 as the surface on the retardation layer side with the ink GR manufactured in Production Example 5, dried, and the character layer E as the second reflective layer is printed. (G, R) was formed. As a result, a display medium 30 including the character layer B (R, G) , the polarizing separation layer 11, the retardation layer 13, and the character layer E (G, R) in this order was obtained.
  • the display article 20 is arranged in a table (not shown ) so that the character layer M (B, R) , the character layer S (G, R), and the character layer I (R, G) face upward. ) Put it on.
  • the display medium 30 was placed on the display article 20 with the character layer B (R, G) side facing up.
  • the display set 2 including the display medium 30 and the display article 20 was observed from above under non-polarized illumination.
  • the character layer B (R, G) is yellow
  • the character layer E (G, R) is green
  • the character layer M (B, R) is blue
  • the character layer S (G, R) is green
  • the character layer. I (R, G) was visually recognized in red.
  • the display medium 30 was turned over and placed on the display article 20, and the display set 2 was observed again.
  • the character layer B (R, G) is green
  • the character layer E (G, R) is yellow
  • the character layer M (B, R) is red
  • the character layer S (G, R) is red
  • the character layer. I (R, G) was visually recognized in green.
  • Example 2 The results of Example 2 are summarized in Table 3 below.
  • FIG. 23 is a cross-sectional view schematically showing the display set 3 manufactured in the third embodiment.
  • the display set 3 manufactured in Example 3 includes a display medium 40 and a display article 20.
  • the display article 20 is the same as that of the first embodiment.
  • the display medium 40 is the same as the display medium 30 of the second embodiment except that the character layer B (G, R) is provided instead of the character layer B (R, G).
  • the display medium 40 manufactured in Example 3 contained a support layer and an adhesive, but these are not shown in FIG. 23.
  • the character layer B (G, R) is formed in the same manner as the character layer B (R, G) formed in Example 2 except that the ink GR produced in Production Example 5 is used instead of the ink RG. Formed.
  • the display article 20 is arranged in a table (not shown ) so that the character layer M (B, R) , the character layer S (G, R), and the character layer I (R, G) face upward. ) Put it on.
  • the display medium 40 was placed on the display article 20 with the character layer B (G, R) side facing up.
  • the display set 3 including the display medium 40 and the display article 20 was observed from above under non-polarized illumination.
  • the character layer B (G, R) is yellow
  • the character layer E (G, R) is green
  • the character layer M (B, R) is blue
  • the character layer S (G, R) is green
  • the character layer. I (R, G) was visually recognized in red.
  • the display medium 40 was turned over and placed on the display article 20, and the display set 3 was observed again.
  • the character layer B (R, R) is red
  • the character layer E (G, R) is yellow
  • the character layer M (B, R) is red
  • the character layer S (G, R) is red
  • the character layer. I (R, G) was visually recognized in green.
  • Example 3 The results of Example 3 are summarized in Table 4 below.
  • FIG. 24 is a cross-sectional view schematically showing the display set 4 manufactured in Comparative Example 1.
  • the display set 4 manufactured in Comparative Example 1 includes a display medium 50 and a display article 20.
  • the display article 20 is the same as that of the first embodiment.
  • the display medium 50 is the same as the display medium 10 of the first embodiment except that a circular polarization filter 53 including a linear polarizing element 51 and a quarter wave plate 52 in combination is provided instead of the base material 12. ..
  • the display medium 50 manufactured in Comparative Example 1 contained a support layer and an adhesive, but those are not shown in FIG. 24.
  • the display medium 50 was manufactured by the following procedure.
  • the slightly blackish circular polarizing filter 53 described in Example 1 of Japanese Patent No. 5828182 was prepared.
  • the circularly polarized light filter 53 was capable of transmitting right-handed circularly polarized light and absorbing left-handed circularly polarized light.
  • the character "B” was printed on the surface 53U of the circular polarizing filter 53 on the linear polarizer 51 side with the ink RG produced in Production Example 4, and dried to form the character layer B (R, G) .
  • the character “E” was printed on the surface 53D on the side of the 1/4 wave plate 52 with the ink GR produced in Production Example 5, and dried to form the character layer E (G, R) .
  • a display medium 50 including the character layer B (R, G) , the circularly polarizing filter 53, and the character layer E (G, R) in this order in the thickness direction was obtained.
  • the display article 20 is arranged in a table (not shown ) so that the character layer M (B, R) , the character layer S (G, R), and the character layer I (R, G) face upward. ) Put it on.
  • the display medium 50 was placed on the display article 20 with the character layer B (R, G) side facing up. Under non-polarized illumination, the display set 4 including the display medium 50 and the display article 20 was observed from above.
  • the character layer B (R, G) is yellow
  • the character layer E (G, R) is green
  • the character layer M (B, R) is blue
  • the character layer S (G, R) is green
  • the character layer. I (R, G) was visually recognized in red.
  • the display medium 50 was turned over and placed on the display article 20, and the display set 4 was observed again.
  • the character layer B (R, G) is yellow
  • the character layer E (G, R) is yellow
  • the character layer M (B, R) is magenta
  • the character layer S (G, R) is yellow
  • Layer I (R, G) was visible in yellow.
  • FIG. 25 is a cross-sectional view schematically showing the display set 5 manufactured in Comparative Example 2.
  • the display set 5 manufactured in Comparative Example 2 includes a display medium 60 and a display article 20.
  • the display article 20 is the same as that of the first embodiment.
  • the display medium 60 is the same as the display medium 50 of Comparative Example 1 except that the character layer B (G, R) is provided instead of the character layer B (R, G).
  • the display medium 60 manufactured in Comparative Example 2 contained a support layer and an adhesive, but those are not shown in FIG. 25.
  • the character layer B (G, R) is the same as the character layer B (R, G) formed in Comparative Example 1 except that the ink GR produced in Production Example 5 is used instead of the ink RG. Formed.
  • the display article 20 is arranged in a table (not shown ) so that the character layer M (B, R) , the character layer S (G, R), and the character layer I (R, G) face upward. ) Put it on.
  • the display medium 60 was placed on the display article 20 with the character layer B (G, R) side facing up. Under non-polarized illumination, the display set 5 including the display medium 60 and the display article 20 was observed from above.
  • the character layer B (G, R) is yellow
  • the character layer E (G, R) is green
  • the character layer M (B, R) is blue
  • the character layer S (G, R) is green
  • the character layer. I (R, G) was visually recognized in red.
  • the display medium 60 was turned over and placed on the display article 20, and the display set 5 was observed again.
  • the character layer B (G, R) is yellow
  • the character layer E (G, R) is yellow
  • the character layer M (B, R) is magenta
  • the character layer S (G, R) is yellow
  • Layer I (R, G) was visible in yellow.
  • Display medium 110 Base material 110U First surface of base material 110D Second surface of base material 111 Depolarization separation layer 120 First reflection layer 121 First reflection pigment 122 Second reflection pigment 130 Second reflection layer 131 First reflection pigment 132 Second Reflective Pigment 200 Display Medium 210 Base Material 210U First Side of Base Material 210D Second Side of Base Material 212 Phase Difference Layer 300 Display Set 400 Display Article 410 Base Article 420 First Display Layer 421 First Display Pigment 422 Second Display Pigment 430 Second Display Pigment 431 Third Display Pigment 440 Third Display Layer 441 Fourth Display Pigment 500 Display Set

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WO2023189788A1 (ja) * 2022-03-30 2023-10-05 日本ゼオン株式会社 識別媒体及び物品
WO2023189787A1 (ja) * 2022-03-30 2023-10-05 日本ゼオン株式会社 識別媒体及び物品
WO2023189966A1 (ja) * 2022-03-30 2023-10-05 日本ゼオン株式会社 識別媒体及び物品
WO2023189967A1 (ja) * 2022-03-30 2023-10-05 日本ゼオン株式会社 識別媒体

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