WO2021230619A1 - 콜레스테릭 액정 표시층을 포함하는 위변조 방지수단 - Google Patents

콜레스테릭 액정 표시층을 포함하는 위변조 방지수단 Download PDF

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Publication number
WO2021230619A1
WO2021230619A1 PCT/KR2021/005879 KR2021005879W WO2021230619A1 WO 2021230619 A1 WO2021230619 A1 WO 2021230619A1 KR 2021005879 W KR2021005879 W KR 2021005879W WO 2021230619 A1 WO2021230619 A1 WO 2021230619A1
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WIPO (PCT)
Prior art keywords
liquid crystal
cholesteric liquid
display layer
layer
prevention means
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Application number
PCT/KR2021/005879
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English (en)
French (fr)
Korean (ko)
Inventor
이인숙
조인석
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엔비에스티(주)
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Publication of WO2021230619A1 publication Critical patent/WO2021230619A1/ko

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    • 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
    • B42D25/378—Special inks
    • B42D25/391—Special inks absorbing or reflecting polarised light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
    • 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
    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal

Definitions

  • the present invention relates to a forgery prevention means including a cholesteric liquid crystal display layer.
  • the difficulty of technology is connected to the differentiation of the material, which is more important than the novelty of the material itself, the range of applicability to which the material can be applied. become a key element.
  • the most important factor in application for forgery prevention is printability.
  • the amount and angle of light passing through the polarizing plate vary according to the degree to which the arrangement of the molecules is changed.
  • Liquid crystal is a substance that has both liquid and solid properties. At low temperatures, it is a solid-like crystal, but when the temperature is raised, it becomes an opaque liquid state that shows fluidity like a liquid, and when the temperature is raised further, it becomes a transparent liquid. It is mainly applied to displays.
  • One of them is a cholesteric liquid crystal in which molecules are twisted at a certain angle to form a spiral structure in each layer, which has been applied to LCD panels mainly used in mobile phones.
  • the LCD panel may be configured by arranging two glass substrates to which a polarizing film is attached so that polarization axes are perpendicular to each other.
  • the vibration direction of light rotates according to the alignment direction of the liquid crystal molecules. Black-and-white images may appear.
  • the cholesteric liquid crystal is a liquid crystal in which a dopant that induces a periodic spiral structure is added to a general nematic liquid crystal, and has a layered structure in which the director of the nematic liquid crystal is twisted along the spiral axis.
  • the cholesteric spiral axes When the cholesteric spiral axes are vertically arranged with respect to the substrate surface, it has a unique property of selectively reflecting light according to the twist direction of the spiral and the pitch of the repeating structure.
  • the circularly polarized light in the same direction as the twisted structure of the cholesteric liquid crystal is reflected, and the circularly polarized light in the other direction is reflected. has a penetrating property.
  • An object of the present invention is to provide a forgery prevention means including a cholesteric liquid crystal display layer.
  • Another object of the present invention is to provide a forgery identification method using a forgery prevention means including a cholesteric liquid crystal display layer.
  • an object of the present invention is to provide an anti-counterfeiting means forgery identification method that is very difficult for forgery, is easy to manufacture, and has a low manufacturing cost, as well as a forgery detection device capable of detecting forgery and tampering with a surrounding display device.
  • the base layer a design print layer laminated on the base layer and printed with a specific pattern; and a display layer laminated on the design print layer and including a cholesteric liquid crystal having a latent-imaged identification pattern that cannot be identified with the naked eye in a state in which non-polarized light is irradiated; It is possible to provide a forgery prevention means comprising a layer.
  • the term 'polarizing material' refers to any material that can detect a specific color, pattern, or change in color and pattern when the material is irradiated with polarized light compared to a state where polarized light is not irradiated. can mean
  • 'QR code' may refer to a code of a two-dimensional (matrix) format containing various information in various combinations of printed patterns made of various types of circular or square dots.
  • 'counterfeiting' used in this specification may refer to any act of creating a new non-existing object for the purpose of use by an unauthorized person, or any act of changing an existing object without authorization.
  • the cholesteric liquid crystal display layer of the present invention preferably includes a first display layer and a second display layer, and at least one of the first display layer and the second display layer comprises: It may be printed with ink containing cholesteric liquid crystal or a film containing cholesteric liquid crystal.
  • the first display layer and the second display layer of the present invention may be printed in the same color based on visual observation in a state in which non-polarized light is irradiated.
  • the color synchronization rate of the first display layer and the second display layer may be 98% based on visual observation.
  • the first display layer may include the cholesteric liquid crystal
  • the second display layer may not include the cholesteric liquid crystal
  • a complementary fluorescent dye, a nematic liquid crystal, or a liquid crystal polymer may be mixed with the cholesteric liquid crystal.
  • a complementary fluorescent dye is mixed with the cholesteric liquid crystal, and the color of the complementary fluorescent dye may be a color forming a complementary contrast relation with the dye included in the design print layer.
  • the first display layer and the second display layer of the present invention are each printed with an ink containing a cholesteric liquid crystal, and each of the cholesteric liquid crystals has a different orientation.
  • the cholesteric liquid crystal of the present invention may be in a liquid phase or a powder form physically microencapsulated in the liquid phase.
  • the ink containing the cholesteric liquid crystal of the present invention may preferably contain 1% to 30% of the cholesteric liquid crystal powder by weight based on the total weight of the ink.
  • the ink containing the cholesteric liquid crystal of the present invention may include an oil solvent and an organic polymer.
  • the oily solvent of the present invention is preferably N-methylpyrrolidone (N-methylpyrrolidone), methylethyl ketone (Methylethyl ketone), toluene (toluene), cyclohexanone (cyclohexanone) and It may be an oily solvent selected from the group comprising mixtures thereof.
  • the organic polymer of the present invention may be a heat-curable or photo-curable adhesive.
  • the thermosetting polymer is a polyurethane-based polymer, a polyvinylalcohol-based polymer, a polyacryl-based polymer, an epoxy-based polymer, a melamine-based resin, or an isocyanate. It may be selected from the group comprising polymer-based polymers, cellulose derivatives, and mixtures thereof.
  • the photo-curable adhesive may be selected from the group including acrylate-based, epoxy-based, vinyl-based monomers, and mixtures thereof.
  • the thickness of the cholesteric liquid crystal display layer of the present invention may be preferably 1-15 ⁇ m.
  • the cholesteric liquid crystal of the present invention may preferably be mixed with a complementary fluorescent dye, a nematic liquid crystal or a liquid crystal polymer.
  • a complementary fluorescent dye, a nematic liquid crystal or a liquid crystal polymer is mixed with the cholesteric liquid crystal. Because, when a complementary fluorescent dye is added to the cholesteric liquid crystal, the color seen by the eye and the color after authentication can be made different.
  • an adhesive layer and a stretched film layer may be further included on the display layer of the present invention.
  • the present invention is a forgery prevention medium containing a polarizing material, a specific pattern that can determine whether forgery or not is printed on the forgery prevention medium, and whether the forgery or not can be irradiated with polarized light It provides a forgery prevention means comprising a polarizing material to irradiate the forgery confirmation means to the forgery prevention medium, or by using a polarizing film.
  • the anti-counterfeiting medium of the present invention may preferably be a label, sticker, packaging material or paint.
  • the specific pattern that can determine whether the forgery or not of the present invention may be a barcode or QR code, and most preferably, a QR code.
  • the most desirable specific pattern for determining whether the forgery or not is the QR code. This is because, when a specific pattern is a QR code, it is not only possible to easily convert the screen of a mobile device equipped with a display to a dedicated screen that can identify whether or not forgery has been made, but also to check whether the first forgery or not by QR code recognition itself. Because.
  • a separate identification pattern that can be identified by polarized light generated on a screen of a mobile device having a display, etc. may be preferably printed on the specific pattern of the present invention.
  • a separate identification pattern that can be identified by polarized light generated on the screen of a mobile device having a display is printed on the specific pattern. This is because, when a separate identification pattern that can be identified by polarized light generated on a screen of a smartphone or the like is printed on a specific pattern, a means for checking whether forgery or not separately from the QR code can be provided.
  • the forgery checking means of the present invention may be preferably selected from the group comprising a smart phone, a tablet PC, a monitor and an LCD TV, more preferably a smart phone or a tablet PC may be, and most preferably may be a smartphone.
  • the most preferable forgery checking means in the present invention is a smartphone. This is because, when using a smartphone, the QR code can be easily photographed using the camera mounted on the smartphone, and the polarized light can be sufficiently generated on the liquid crystal screen, as well as the size is small, so it is only possible to check whether forgery or not. This is because it is easy to check whether forgery or not by using the screen.
  • the forgery checking means of the present invention may be a mobile device having a display, and preferably the forgery checking means selected from the group comprising the smart phone, tablet PC, monitor and LCD TV. It may be confirmed by irradiating the light generated from the screen portion to the forgery prevention medium using the screen portion.
  • the present invention it is a very important configuration to check by irradiating the polarized light generated from the screen portion to the forgery prevention medium using the screen portion of the mobile device having a display, which is a forgery checking means. This is because, in the process of passing or reflecting the polarized light generated from the screen portion of the mobile device having a display, the polarizing material included in the forgery prevention medium, the color and/or pattern of the identification pattern is changed and the identification pattern is visually inspected. to make it identifiable.
  • a solid background may occupy 70% or more of an area of the screen portion in the screen portion of the present invention.
  • the monochromatic color of the present invention may be preferably selected from the group comprising white, gray, ivory, yellow, sky blue and yellow green, more preferably white or ivory, Most preferably, it may be white.
  • the most preferred solid color in the present invention is white. This is because, when polarized light is irradiated to the identification pattern using a white screen, the clarity of the identification pattern is significantly higher than when polarized light is irradiated using a screen of a different color.
  • the anti-forgery medium containing the polarizing material of the present invention is preferably printed using an ink that has the same color or looks the same at a glance, but either ink is a cholesteric liquid crystal ink
  • the other ink may include a printed layer printed using the cholesteric liquid crystal ink and the cholesteric liquid crystal ink in a different direction from the cholesteric liquid crystal ink.
  • the specific pattern of the present invention is preferably a QR code pattern
  • the QR code is recognized using a mobile device equipped with the display, and the screen portion of the mobile device equipped with the display is displayed. It may be to convert the printed layer printed using the polarizing material to a dedicated screen that can be checked.
  • a polarizing layer provided with a polarizing film or ink containing a polarizing material or provided with a polarizing film; and a display layer laminated on the polarizing layer and including a cholesteric liquid crystal having a latent imaged identification pattern that cannot be identified with the naked eye in a state in which non-polarized light is irradiated. It is possible to provide a forgery prevention means comprising a.
  • a transparent or semi-transparent base layer may be provided on one surface of the upper and lower surfaces of the polarizing layer opposite to the portion on which the display layer is laminated, or may be exposed to the outside.
  • a retardation film layer for changing the phase of the polarized light introduced through the polarizing layer may further include.
  • a coating layer laminated on the upper side of the retardation film layer; and a portion facing the coating layer among both surfaces of the retardation film layer may be engraved.
  • the display layer includes: a first display layer provided with general ink or ink containing cholesteric liquid crystal; and a second display layer comprising retardation ink in which retardation film powder is mixed with general ink.
  • the retardation ink may contain 1% to 30% of the retardation film powder weight based on the total weight of the ink.
  • the polarizing layer may include a forgery prevention means including a cholesteric liquid crystal display layer, characterized in that the cholesteric liquid crystal is included.
  • the present invention has the effect of providing a forgery prevention means including a cholesteric liquid crystal display layer.
  • the present invention has an effect of providing a forgery identification method using a forgery prevention means including a cholesteric liquid crystal display layer.
  • the present invention has the effect of providing a forgery identification method, which is a forgery prevention means that is very difficult to forgery, is easy to manufacture, and has a low manufacturing cost, as well as a forgery detection means capable of detecting forgery with a surrounding display device.
  • FIG. 1 shows the structure of a cholesteric liquid crystal ink and a liquid crystal.
  • a forgery prevention means including a first display layer including a cholesteric liquid crystal (left) to which a complementary fluorescent dye is not added, and a cholesteric liquid crystal (right) to which a complementary fluorescent dye is added. It shows a state in which the forgery prevention means including the first display layer is placed side by side and viewed using a polarizing film (polarized viewer).
  • FIG. 5 is a view showing a state of being viewed using a polarizing film (polarizing viewer), with the forgery prevention means without the stretched film layer and the forgery prevention means including the stretched film layer side by side.
  • FIG. 6 shows a state of checking whether forgery or not using a mobile phone screen.
  • FIG. 8 shows an example of a concept in which a printed layer in which an identification pattern is printed using liquid crystal ink is laminated on one surface of the polarizing layer.
  • FIG 9 shows an example of a concept in which a retardation film layer and a coating layer are laminated on one surface of a polarizing layer.
  • FIG. 10 shows an example of a concept in which an identification pattern is printed on one surface of a polarizing layer using retardation ink in which general ink and retardation film powder are mixed.
  • FIG. 11 illustrates the concept of a printed layer printed using cholesteric liquid crystal inks of different structures and orientations, but printed using inks having the same color or the same appearance at a glance.
  • QR code 12 shows the appearance of a QR code for preventing forgery and forgery in which an identification pattern produced using ink containing a polarizing material is printed on the QR code.
  • FIG. 13 shows a state in which a QR code pattern is recognized through an application dedicated to a mobile device having a display and a state in which the smartphone screen is converted into a dedicated forgery confirmation screen by the recognition of the QR code pattern.
  • FIG. 14 shows a state in which an identification pattern printed on a middle part of a QR code is checked using a dedicated forgery confirmation screen of a mobile device having a display.
  • 15 is a flowchart illustrating whether forgery or not by using a forgery prevention means including a polarizing material.
  • FIG. 1 shows the molecular arrangement state of the cholesteric liquid crystal, and it can be seen that the molecules are arranged differently for each planar layer, but rotate in a spiral shape toward the upper or lower part.
  • FIGS. 2 to 7 show a cross-section of a forgery prevention means including a cholesteric liquid crystal display layer according to an embodiment of the present invention, a method of checking forgery using a mobile device equipped with a display and a polarizing film. have.
  • the forgery prevention means including a cholesteric liquid crystal display layer includes a base layer 110 , a design print layer 120 , and a first display layer 131 . and a display layer 130 including the second display layer 132 , an adhesive layer 140 , and a stretched film layer 150 in which polymer molecules of general plastic are stretched in a predetermined direction.
  • the base layer 110 may be located in the lowermost layer of the forgery prevention means 100 including a cholesteric liquid crystal display layer, and various films used in the art, such as synthetic resin, paper, and metal, to manufacture labels, etc. can be used
  • the design print layer 120 is positioned on the base layer 110 , and a pattern distinct from the display layer 130 to be described later may be printed.
  • the display layer 130 may be printed on the substrate layer 110 , and when the design printing layer 120 is provided, it may be printed on the design printing layer 120 .
  • the display layer 130 may have a thickness of 15 ⁇ m or less, may be positioned on the design print layer 120 , and include a first display layer 131 and a second display layer 132 .
  • a key factor related to applicability in printing the display layer 130 on the design printing layer 120 is the thickness of the printing layer, and if the thickness of the printing layer is thick, the available printing substrates are limited or printing is impossible. can occur
  • the lower limit of the average size of ink particles available for actual printing is 15 ⁇ m (eg, silkscreen printing method), and the average ink particle size of more advanced printing methods (eg, gravure printing method, offset printing method) is less than 5 ⁇ m.
  • the thickness of the display layer 150 may be 15 ⁇ m or less, and more preferably 5 ⁇ m or less because the thickness of the printed layer should be thinner in order to be applied to packaging materials.
  • the first display layer 131 and the second display layer 132 are printed using ink containing cholesteric liquid crystal on only one of the two display layers, and the remaining display layers are general.
  • An embodiment in which ink is printed and an embodiment in which both the first display layer 131 and the second display layer 132 are printed using ink containing cholesteric liquid crystal may be included.
  • the ink used for printing the display layer be the same color as the ink containing the cholesteric liquid crystal and the ink not containing the cholesteric liquid crystal, or ink that appears to have the same color at a glance.
  • the activation method is disclosed to the outside, otherwise, if only the seller of the product or the anti-counterfeiting service provider can check whether the product is a counterfeit, a consumer or a third party producing or distributing the counterfeit product can authenticate the product. This is to ensure that the method cannot be seen and measured with the naked eye.
  • the general ink is fluorescence ink or phosphorescent ink.
  • phosphorescence ink thermochromic ink
  • photochromic ink photochromic ink
  • optical variable ink optical variable ink
  • it may be any one of magnetic ink (magnetic ink).
  • the orientation of the cholesteric liquid crystal used in each display layer may be different. Through this, when polarized light is irradiated with each other, different colors are identified, so that a hidden mark for checking whether forgery or not can be identified.
  • the cholesteric liquid crystal powder may be a cholesteric liquid crystal microcapsule, and the cholesteric liquid crystal microcapsule may have a printable average diameter of about 10 ⁇ m.
  • the weight of cholesteric liquid crystal powder contained based on the total weight of ink containing cholesteric liquid crystal may account for 1-30%, and the remaining At least a portion of the weight may be occupied by at least one of the general inks.
  • the cholesteric liquid crystal powder and the thermosetting binder may be mixed with each other, and the weight of the cholesteric liquid crystal powder is the base layer ( 110) or the design printing layer 120 and the maximum possible adhesion may be 30% or less.
  • thermosetting binder is preferably provided as an acrylic acid-based binder.
  • the ink including the cholesteric liquid crystal may be occupied by a nematic liquid crystal or a liquid crystal polymer, not a general ink.
  • a part of the total weight of the ink is composed of cholesteric liquid crystal and the remaining part is composed of nematic liquid crystal or liquid crystal polymer, and a current flows through it to adjust the orientation angle of the nematic liquid crystal or liquid crystal polymer, thereby reducing polarization during authentication.
  • the front and rear colors can be reflected differently.
  • a complementary fluorescent dye may be added to the cholesteric liquid crystal of the ink containing the cholesteric liquid crystal, and the color of the added complementary fluorescent dye has a complementary color contrast relation with the dye included in the design printing layer 120 . It may be a color constituting
  • a pigment forming a complementary color contrast relation with the complementary fluorescent dye included in the cholesteric liquid crystal may be added to the design print layer 120 .
  • the complementary color contrast relationship refers to a combination of colors that are generally located on opposite sides of the color wheel, such as orange and green, yellow and indigo, in which each color looks more intense and vivid due to the influence of each other when viewed side by side.
  • FIG. 4 shows forgery prevention means including a first display layer 131 including a cholesteric liquid crystal (left) to which a complementary fluorescent dye is not added, and a cholesteric liquid crystal to which a complementary fluorescent dye is added (right).
  • first display layer 131 including a cholesteric liquid crystal (left) to which a complementary fluorescent dye is not added, and a cholesteric liquid crystal to which a complementary fluorescent dye is added (right).
  • the first display layer 131 has a rhombus pattern in a cross shape, and it can be seen that the one containing the complementary fluorescent dye on the right shows higher saturation than the one on the left.
  • the counterfeit prevention means on the right side used in the comparative experiment were a base layer containing synthetic PP paper, a design print layer containing a binder containing 15% green pigment, 10% cholesteric liquid crystal microcapsules with a liquid crystal content of 7%, and an acrylic binder. It includes a first display layer printed by mixing 89% and 1% orange fluorescent dye, and a second display layer printed by mixing 10% of cholesteric liquid crystal microcapsules with a liquid crystal content of 7% and 90% of an acrylic binder. .
  • the above orange fluorescent dye is a general fluorescent dye expressed in general long-wavelength UV 356 nm, and the display layer is an example printed in a thickness of 5 to 15 ⁇ m using a 150 mesh mesh network in a silk screen printing method.
  • the latent image of the cholesteric liquid crystal can be observed with the naked eye.
  • a stretched film layer 150 may be selectively stacked on the display layer 130 , and an adhesive layer 140 bonding the two may be located between the stretched film layer 150 and the display layer 130 .
  • the stretched film layer 150 When the stretched film layer 150 is positioned on the display layer 130, the light refracted by the cholesteric liquid crystal ink is further refracted to increase the discrimination power of the identification pattern (hidden mark).
  • the stretched film is preferably composed of an OPP Film (Bi-Axially oriented PP film) with improved optical properties and improved transparency.
  • OPP Film Bi-Axially oriented PP film
  • 5 is an experimental example in which the forgery prevention means not including the stretched film layer 150 and the forgery prevention means including the stretched film layer 150 are placed side by side and authenticated using a polarizing film (polarized viewer).
  • the display layer 130 has a circular pattern, and the forgery prevention means including the stretched film layer 150 on the right side is brighter and has higher saturation than the left side.
  • the counterfeit prevention means on the right side used in the comparative experiment are a base layer containing synthetic PP paper, a design print layer containing a binder containing 15% silver powder, 10% cholesteric liquid crystal microcapsules with a liquid crystal content of 7%, and an acrylic binder.
  • a first display layer printed by mixing a second display layer printed by mixing 10% of cholesteric liquid crystal microcapsules with a liquid crystal content of 7% and 90% of an acrylic binder, and a 30 ⁇ m stretched film (OPP Film, Bi-Axially) oriented PP film) layer.
  • FIG. 6 is an example illustrating a state in which an identification pattern latent imaged on the display layer 130 appears by irradiating polarized light from the liquid crystal of a mobile device
  • FIG. 7 is a cholesteric liquid crystal display layer using a polarizing film. It is an example showing a state in which the latent imaged identification pattern appears by allowing the polarized light to reach the forgery prevention means 100 .
  • the stretched film layer 150 and the base layer 110 may be optionally additionally provided.
  • the forgery prevention means 100 including a cholesteric liquid crystal display layer according to an embodiment of the present invention is provided with a polarizing film or ink containing a polarizing material, or polarized light provided with a polarizing film. It can be seen that the layer 160 is further included.
  • the polarization layer 160 may be provided in a selective form in any form, if necessary, as long as it can convert incident light such as a linear polarization layer, a circular polarization layer, and an elliptically polarization layer into a polarization form and transmit it.
  • polarizing film or ink containing cholesteric liquid crystal which is one of the above-described circularly polarizing layers
  • the polarizing layer 160 is also provided with a combination of a polarizing layer or a combination of a polarizing layer and a general ink layer.
  • Identification patterns may be latent.
  • a display layer 130 having the identification pattern latent imaged thereon may be further provided on one surface of the polarization layer 160 , and the display layer 130 includes the first display layer 131 and the second display layer ( 132) may be included.
  • the first display layer 131 and the second display layer 132 are printed using ink containing cholesteric liquid crystal on only one of the two display layers, and the remaining display layers are printed with general ink. Examples in which printing is performed using , and embodiments in which both the first display layer 131 and the second display layer 132 are printed using ink containing cholesteric liquid crystal may be included.
  • a complementary fluorescent dye may be added to the cholesteric liquid crystal of the ink containing the cholesteric liquid crystal.
  • an identification pattern (a first identification pattern) may be revealed by the display layer 130 and the polarization layer 160 when viewed from above in a state in which non-polarization is irradiated from top to bottom.
  • the light filtered by the polarization layer 160 has a different identification pattern depending on the alignment direction of the liquid crystal molecules of the display layer 130 (second identification pattern) can be confirmed, and when looking down from above, another identification pattern (third identification pattern) can be confirmed.
  • the identification pattern to be confirmed is changed according to the light irradiation direction and the gaze direction, so that the security of the forgery prevention means 100 can be maximized.
  • Forgery prevention means 100 including a cholesteric liquid crystal display layer according to an embodiment of the present invention is a retardation film in which the polarizing layer 160, the display layer 130, and an intaglio pattern 170a are formed on the upper side. It may include a layer 170 and a coating layer 180 covering the retardation film layer 170 .
  • the retardation film is an optically anisotropic film and functions such as optical compensation, viewing angle expansion, and color compensation depending on the purpose.
  • the retardation film converts the optical element with the birefringence into a broad band, rotates the linearly polarized light incident obliquely through the polarizer and converts it into a polarized state perpendicular to the transmission axis of the analyzer, so that the polarized light on the coating layer is obliquely
  • the latent images of the display layer 130 and the polarization layer 160 can be clearly identified even when incident.
  • the latent image discrimination power of the display layer 130 and the polarizing layer 160 is improved by the retardation film layer 170, and an identification pattern partially deformed by the intaglio pattern 170a is formed.
  • the forgery prevention means 100 including a cholesteric liquid crystal display layer may include the polarization layer 160 and a display layer 130 including retardation ink.
  • the display layer 130 includes a first display layer 131 made of general ink or ink containing cholesteric liquid crystal, and a second display made of retardation ink in which retardation film powder is mixed with general ink. layer 132'.
  • the general ink of the second display layer and the retardation film powder may be mixed in a ratio of 100: 1-30 based on the total weight.
  • the first display layer 131 when light is irradiated from bottom to top, the first display layer 131 is expressed according to the orientation direction, and the light passing through the second display layer 132' is converted into a polarized state perpendicular to the transmission axis. It can be irradiated upward more brightly.
  • liquid crystal inks (K, T) having different alignment structures are applied to the base layer 110, and if one liquid crystal ink (K) is a cholesteric liquid crystal ink oriented in a spiral direction, The remaining liquid crystal ink T may be provided as a cholesteric liquid crystal ink oriented in a semi-helical direction.
  • FIGS. 12 to 13 show an example of a forgery prevention means 100 including a cholesteric liquid crystal display layer and a forgery detection method using the same according to an embodiment of the present invention.
  • the forgery prevention means 100 including a cholesteric liquid crystal display layer may include a QR code 10 and an identification pattern 20 . .
  • the secondary determination as to whether forgery or not is a polarizing film ( FIG. 5 ) or a mobile having a display to be described later. It can be visually identified and determined using the screen 40 for checking forgery induced by the device application 30 .
  • a specific pattern of polarized light can be irradiated on the screen 40 for checking forgery, and the irradiated polarized light reaches the forgery prevention means 100 including the cholesteric liquid crystal display layer, so that the secondary discrimination process using polarized light is performed. It may proceed as shown in FIG. 12 .
  • the identification pattern 20 can be most clearly identified when a white background screen is used.
  • the most preferred solid color in the present invention is white. This is because, when polarized light is irradiated to the identification pattern using a white screen, the clarity of the identification pattern is significantly higher than when polarized light is irradiated using a screen of a different color.
  • the screen 40 for checking forgery and tampering may be configured as a monochromatic background screen in an area of 70% or more of the screen, which may be irradiated with polarized light having a specific vibration direction. Through this, the present invention can easily proceed with the secondary discrimination process without a separate polarizing film.
  • Step (a) First forgery verification step:
  • Step (a) is a process of first determining whether forgery or not by recognizing the QR code 10 using a camera mounted on the mobile device 50 having a display.
  • the light 60 generated from the switched dedicated screen 40 is irradiated to the QR code 10 for identification
  • a secondary determination as to whether or not forgery or not is performed based on the presence or absence of the pattern 20 or whether the pattern is the same.
  • the light irradiated from the mobile device 50 having a display exhibits polarization characteristics
  • the light 60 generated from the screen is rotated at an angle of 90 degrees to the identification pattern 20 by rotating the dedicated screen 40 . It is preferable to examine the presence or absence of the identification pattern 20 and to determine whether the pattern is the same.
  • the present invention may additionally have different effects of each of the above-described components, and derive a new effect that cannot be seen in the prior art according to the organic coupling relationship between each of the above-described components. can do.

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PCT/KR2021/005879 2020-05-13 2021-05-11 콜레스테릭 액정 표시층을 포함하는 위변조 방지수단 WO2021230619A1 (ko)

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