CN113671732A - Anti-counterfeiting modification device comprising cholesteric liquid crystal display layer - Google Patents
Anti-counterfeiting modification device comprising cholesteric liquid crystal display layer Download PDFInfo
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- CN113671732A CN113671732A CN202110524198.3A CN202110524198A CN113671732A CN 113671732 A CN113671732 A CN 113671732A CN 202110524198 A CN202110524198 A CN 202110524198A CN 113671732 A CN113671732 A CN 113671732A
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Classifications
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1313—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
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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
- B42D25/364—Liquid crystals
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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
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
- B42D25/465—Associating two or more layers using chemicals or adhesives
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- 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
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—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
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Manufacturing & Machinery (AREA)
- Polarising Elements (AREA)
- Credit Cards Or The Like (AREA)
Abstract
The invention relates to an anti-counterfeiting modification device comprising a cholesteric liquid crystal display layer, which is characterized by comprising the following components: a substrate layer; a design printing layer laminated on the base material layer and printed with a specific pattern; and a display layer laminated on the design printing layer, including cholesteric liquid crystal including a latent image recognition pattern which is not recognized by naked eyes in a non-polarized light irradiated state.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to an anti-counterfeiting modification device comprising a cholesteric liquid crystal display layer.
[ background of the invention ]
In general, in the certified product authentication technology, the technologies of holograms and QR codes are low in difficulty and easy to copy, and technologies such as NFC (near field communication), RFID (radio frequency identification), matrix bar code symbols (Dot-code) are difficult to be applied to the field of common foods or cosmetics due to high unit price, so that a new technology capable of solving the problems of technical difficulty and unit price is continuously required.
The technical difficulty is generally related to the difference of the materials, more important than the novelty of the materials is the application range of the materials, and the applicability of the materials is based on the characteristics of a commodity group to be used and whether the materials can be produced in batches or not. In particular, the most important factor for anti-counterfeiting alteration is printability.
Inks that can be simply printed on plain paper or film, such as fluorescent inks (fluorescent inks), phosphorescent inks (phosphorescent inks), thermal inks (thermo inks), photochromic inks (photochromic inks), optically variable inks (optically variable inks), magnetic inks (magnetic inks), liquid crystals (liquid crystals), and the like, are widely used for forgery prevention.
In addition, liquid crystals using the principle of polarized light (polarized light) vary in the amount of light and angle passing through the polarizing plate depending on the degree of change in the arrangement of the molecules, and if adjusted, can function as a diaphragm for adjusting the intensity of light.
Liquid crystals (Liquid crystals) are substances having both Liquid and solid properties, are crystals like solids at low temperatures, but are in an opaque Liquid state exhibiting fluidity as if they were a Liquid after temperature rise, and become transparent liquids when they are further heated, and are therefore mainly used for screens.
One of them is that each layer has cholesteric liquid crystal whose molecules are twisted at a certain angle to form a helical structure, which is suitable for LCD panels mainly used for mobile phones.
The LCD panel is formed by arranging two glass substrates to which polarizing films are attached so that polarizing axes are orthogonal to each other.
As the polarization axis is twisted and rotated, the vibration direction of light is rotated along with the alignment direction of the liquid crystal molecules, and at this time, if a certain voltage is applied, the twisted structure of the liquid crystal is broken, and the ability of the light vibration direction to rotate is lost, so that light cannot pass through, and thus a black-and-white image may appear.
A cholesteric liquid crystal is a liquid crystal in which a dopant (dopant) inducing a periodic helical structure is added to a general Nematic (Nematic) liquid crystal, and a layer structure is formed by a director of the Nematic liquid crystal being wound along a helical axis.
And has an inherent characteristic that when a cholesteric helix axis is aligned perpendicularly to a substrate surface, light is selectively reflected according to a twist direction of the helix and a pitch of a repeating structure.
That is, when light incident on the cholesteric liquid crystal is displayed in the sum of two circularly polarized lights having opposite rotational directions, 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 transmitted.
According to the related patent documents in the past, a forgery prevention medium or the like in which a part of a recording medium is formed by using a polarizing sublayer and a transfer foil including a polarizing sublayer and an adhesive layer is bonded to a recording medium has a problem that it is not suitable for mass printing, and its applicability is low.
[ summary of the invention ]
[ problem ] to provide a method for producing a semiconductor device
The invention aims to provide a forgery prevention modification device comprising a cholesteric liquid crystal display layer.
Another object of the present invention is to provide a method for identifying a counterfeit in a counterfeit prevention device using a cholesteric liquid crystal display layer.
The invention aims to provide a false alteration identification method of a false alteration prevention device, which has the advantages of high false alteration difficulty, simple and convenient manufacture and low manufacture cost and can be distinguished by peripheral display equipment.
[ technical solution ] A
According to an embodiment of the present invention, there is provided a forgery prevention alteration device including a cholesteric liquid crystal display layer, preferably, including: a substrate layer; a design printing layer laminated on the base material layer and printed with a specific pattern; and a display layer laminated on the design printing layer, including cholesteric liquid crystal including a latent image recognition pattern which is not recognized by naked eyes in a non-polarized light irradiated state.
The term "polarizing substance" used in the present specification means any substance that can detect a specific color, pattern, or change in color and pattern by irradiating polarized light to the substance and comparing the state with the state without irradiating polarized light.
The term "QR code" used herein refers to a two-dimensional (matrix) code including a plurality of types of information in a plurality of combinations of printed patterns each including a plurality of types of circular or rectangular dots (dots).
The term "pseudo alteration" as used herein refers to any action of newly manufacturing an existing article for the purpose of use by an unauthorized person or of altering an existing article without authorization.
According to a preferred embodiment of the present invention, the cholesteric liquid crystal display layer of the present invention preferably includes a first display layer and a second display layer, and one or more of the first display layer and the second display layer is printed with an ink containing cholesteric liquid crystal or is a film containing cholesteric liquid crystal.
According to a preferred embodiment of the present invention, the first display layer and the second display layer of the present invention may preferably be printed with the same color as observed with the naked eye in a non-polarized light irradiated state.
According to a preferred embodiment of the present invention, in a state of non-polarized light irradiation, the color synchronization rate of the first display layer and the second display layer based on visual observation is 98%.
According to a preferred embodiment of the invention, said first display layer comprises said cholesteric liquid crystal; the second display layer may not contain the cholesteric liquid crystal.
According to a preferred embodiment of the invention, the cholesteric liquid crystal is mixed with a complementary color fluorescent dye, a nematic liquid crystal or a liquid crystal polymer.
According to a preferred embodiment of the present invention, a complementary color fluorescent dye is mixed in the cholesteric liquid crystal, and a color of the complementary color fluorescent dye and a dye contained in the design printing layer form a complementary color contrast relationship.
According to a preferred embodiment of the present invention, the first display layer and the second display layer are printed with inks containing cholesteric liquid crystals, respectively, each having a different orientation from each other.
According to a preferred embodiment of the present invention, the cholesteric liquid crystal of the present invention is in a liquid state or in a powder state in which a liquid state is physically microencapsulated.
According to a preferred embodiment of the present invention, the ink containing the cholesteric liquid crystal is preferably 1 to 30% by weight of cholesteric liquid crystal powder, based on the total weight of the ink.
According to a preferred embodiment of the present invention, the ink containing the cholesteric liquid crystal of the present invention may preferably contain an oil solvent and an organic polymer.
According to a preferred embodiment of the present invention, the oily solvent of the present invention is preferably an oily solvent selected from the group consisting of N-methylpyrrolidone (N-methylpyrrolidone), methyl ethyl ketone (methylethylketone), toluene (tolumene), cyclohexanone (cyclohexoxanone), and a group comprising these mixtures.
According to a preferred embodiment of the invention, the organic polymer of the invention is a heat-curable or light-curable adhesive. Preferably, the thermosetting polymer is selected from the group consisting of polyurethane (polyurethane) polymers, polyvinyl alcohol (polyvinyl alcohol) polymers, polyacrylic acid (polyacrylic) polymers, epoxy resin (epoxy) polymers, melamine (melamine) resins, isocyanate (isocyanate) polymers, cellulose derivatives, and mixtures thereof. The photocurable adhesive is selected from the group consisting of acrylate (acrylate) based, epoxy (epoxy) based, vinyl (vinyl) based monomers and mixtures thereof.
According to a preferred embodiment of the invention, the thickness of said cholesteric liquid crystal display layer of the invention is preferably 1 to 15 μm.
According to a preferred embodiment of the present invention, in the cholesteric liquid crystal of the present invention, preferably, complementary color fluorescent dye, nematic liquid crystal or liquid crystal polymer (liquid crystal polymer) may be mixed.
In the present invention, it is very important that a complementary color fluorescent dye, a nematic liquid crystal or a liquid crystal polymer is mixed in the cholesteric liquid crystal. Since the complementary color fluorescent dye is added to the cholesteric liquid crystal, a color which can be seen with naked eyes is different from a color after verification.
According to a preferred embodiment of the present invention, the upper portion of the display layer of the present invention may further include an adhesive layer and an extension film layer.
According to another embodiment of the present invention, there is provided a forgery-preventing medium including a polarizing substance, on which a specific pattern is printed to distinguish whether or not a forgery is made, the forgery-preventing medium being a forgery-preventing medium including a polarizing substance confirmed by irradiating a forgery-preventing medium with a polarized light or a forgery-preventing medium including a polarizing substance with a forgery-preventing confirmation device.
According to the preferred embodiment of the present invention, the anti-counterfeiting changing medium of the present invention is preferably a label, sticker, packaging material or paint.
According to a preferred embodiment of the present invention, the specific pattern of the present invention, which can distinguish whether or not the false alteration is made, is preferably a barcode or a QR code, and most preferably a QR code.
The most preferred specific pattern in the present invention, which can distinguish whether the false alteration or not, is a QR code, which is a very important structure. Since the specific pattern is a QR code, an interface such as a mobile device having a screen can be easily switched to a dedicated interface for recognizing whether or not the screen is altered, and whether or not the screen is altered can be first confirmed by the QR code recognition.
According to a preferred embodiment of the present invention, among the specific patterns of the present invention, it is preferable that other recognition patterns recognizable by polarized light generated on an interface of a mobile device or the like provided with a screen be printed.
In the present invention, it is very important to print different recognition patterns recognizable by polarized light generated from an interface such as a mobile device having a screen on the specific pattern. Since the specific pattern is printed with an identification pattern that can be recognized by polarized light generated from an interface such as a smartphone, a means for confirming whether or not the specific pattern is a false alteration may be provided in addition to the QR code.
According to a preferred embodiment of the present invention, the pseudo-alteration confirmation apparatus of the present invention is preferably selected from the group consisting of a smart phone, a tablet computer, a monitor, and a liquid crystal display, further preferably a smart phone or a tablet computer, and most preferably a smart phone.
The most preferable pseudo alteration confirming device in the present invention is a very important structure of a smart phone. Because the mobile phone is used, the QR code can be easily shot by using a camera installed on the smart phone, polarized light can be fully generated on a liquid crystal interface, the size is small, and whether the false is changed or not can be easily confirmed by using a special interface for confirming whether the false is changed or not.
According to a preferred embodiment of the present invention, the counterfeit deterrent device of the present invention is a mobile device having a screen, and preferably, the counterfeit deterrent medium is irradiated with light generated by an interface portion of the counterfeit deterrent device selected from the group consisting of the smartphone, the tablet computer, the display, and the liquid crystal display.
In the present invention, it is an important configuration to irradiate the forgery-preventing alteration medium with polarized light generated in the interface portion by using the interface portion of the mobile device including the screen as the forgery-preventing alteration confirming means. Because the color and/or pattern of the identification pattern is changed during the process that the polarized light generated by the interface part of the mobile device with the screen penetrates through the polarizing material contained in the anti-counterfeiting changing medium or is reflected, the identification pattern can be identified by naked eyes.
According to a preferred embodiment of the present invention, in the interface portion of the present invention, the single-color background occupies 70% or more of the area of the interface portion.
According to a preferred embodiment of the present invention, said single color of the present invention is preferably selected from the group consisting of white, gray, ivory, yellow, blue and light green, further preferably white or ivory, most preferably white.
It is important in the present invention that the most preferred single color is white. Since polarized light is irradiated to the identification pattern with a white interface, the sharpness of the identification pattern is significantly improved compared to when polarized light is irradiated with other color interfaces.
According to a preferred embodiment of the present invention, the anti-counterfeiting alteration medium containing the polarizing substance of the present invention preferably comprises: the printing layer is printed by using ink with the same color or the same appearance at a glance, and one ink uses cholesteric liquid crystal ink, and the other ink uses cholesteric liquid crystal ink with different directions from the cholesteric liquid crystal ink.
According to a preferred embodiment of the present invention, the specific pattern of the present invention is preferably a QR code pattern, and the QR code is recognized by the mobile device having the screen, and the interface portion of the mobile device having the screen is switched to a dedicated interface through which the printed layer printed with the polarizing material can be confirmed.
According to an embodiment of the present invention, there may be provided a forgery prevention alteration device including a cholesteric liquid crystal display layer, including: a polarizing layer provided with a polarizing film or an ink containing a polarizing substance or with a polarizing film; and a display layer laminated on the polarizing layer, including cholesteric liquid crystal including a latent image recognition pattern that is not recognizable with naked eyes in a non-polarized light irradiated state.
According to a preferred embodiment of the present invention, a transparent or translucent base material layer is provided on the opposite side of the portion of the upper and lower surfaces of the polarizing layer on which the display layer is laminated, or is exposed to the outside.
According to a preferred embodiment of the present invention, it may further include: and a retardation film layer for changing the phase of the polarized light flowing in through the polarizing layer.
According to a preferred embodiment of the present invention, further comprising: a coating layer laminated on an upper side of the phase difference film layer; and the part of the two surfaces of the phase difference film layer, which faces the coating layer, is provided with an intaglio.
According to a preferred embodiment of the present invention, the display layer includes: a first display layer provided with a normal ink or an ink containing cholesteric liquid crystal; and a second display layer provided by a phase difference ink in which phase difference film powder is mixed in a common ink.
According to a preferred embodiment of the present invention, the phase difference ink comprises 1 to 30% by weight of phase difference film powder based on the total weight of the ink.
According to a preferred embodiment of the invention, a tamper-proof device comprising a cholesteric liquid crystal display layer comprising cholesteric liquid crystals may be included.
[ PROBLEMS ] the present invention
According to the present invention, there is an advantageous effect in that,
a tamper-resistant modification device including a cholesteric liquid crystal display layer may be provided;
a method for identifying a false alteration by using an anti-counterfeiting alteration device comprising a cholesteric liquid crystal display layer;
the invention provides a false alteration identification method for a false alteration preventing device, which is difficult in false alteration, simple in manufacture and low in manufacture cost, and can distinguish false alteration by peripheral display equipment.
[ description of the drawings ]
FIG. 1 shows cholesteric liquid crystal ink and the structure of liquid crystals;
FIGS. 2 and 3 show cross-sections of a tamper-resistant altering device according to the invention;
FIG. 4 is a view showing a state in which the forgery prevention device including the first display layer containing cholesteric liquid crystal (left side) to which no complementary color fluorescent dye is added and the forgery prevention device including the first display layer containing cholesteric liquid crystal (right side) to which a complementary color fluorescent dye is added are arranged side by side and observed with a polarizing film (polarizing viewer);
FIG. 5 is a view showing a state in which a forgery prevention alteration device not including an extension film layer and a forgery prevention alteration device including an extension film layer are arranged side by side and observed with a polarizing film (polarizing viewer);
FIG. 6 is a view showing a state in which whether or not the pseudo-alteration is confirmed by the interface of the mobile phone;
FIG. 7 is a view showing a state where whether or not the pseudo-alteration is confirmed by a polarizing film;
fig. 8 is a view illustrating an example of a concept in which a printing layer for printing an identification pattern with liquid crystal ink is laminated on one surface of a polarizing layer;
fig. 9 is a view illustrating an example of a concept in which a retardation film layer and a coating layer are laminated on one side of a polarizing layer;
FIG. 10 is a view showing an example of a concept of printing a recognition pattern on one side of a polarizing layer using a phase difference ink mixed with a general ink and phase difference film powder;
FIG. 11 is a diagram illustrating the concept of a printed layer printed with inks of the same color or appearing to be the same but printed with cholesteric liquid crystal inks having different structural orientations from one another;
fig. 12 is a diagram showing a state in which a QR code for forgery prevention modification in which an identification pattern made using an ink containing a polarizing substance is printed on the QR code;
fig. 13 is a view showing a state where a QR code pattern is recognized by a mobile device-specific application having a screen and a state where a smartphone interface is switched to a specific pseudo-alteration confirmation interface in accordance with the recognition of the QR code pattern;
fig. 14 is a view showing a state where the identification pattern printed in the middle portion of the QR code is confirmed using a dedicated pseudo-alteration confirmation interface of the mobile device provided with a screen;
FIG. 15 is a sequence diagram showing the confirmation of whether or not a forgery is made by the forgery prevention changing device including a polarizing material.
[ notation ] to show
10: a QR code; 20: identifying a pattern;
30: a smartphone application; 40: a pseudo-alteration confirmation interface;
50: a smart phone; 60: light emitted from the interface;
100: an anti-counterfeiting morphing device; 110: a substrate layer;
120: designing a printing layer; 130: a display layer;
140: an adhesive layer; 150: extending the film layer;
160: a polarizing layer; 170: a phase difference film layer;
170 a: engraving a pattern in the shade; 180: a coating layer;
190: a common ink layer.
[ detailed description ] embodiments
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings in which embodiments of the invention are shown, but the described embodiments are only a part and not all of the embodiments of the invention. Based on the embodiments of the present invention, those skilled in the art may still modify the technical solutions described in the foregoing embodiments, or may equivalently replace some of the technical features in the foregoing embodiments; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 illustrates a molecular arrangement state of cholesteric liquid crystal, in which molecules of each planar layer are differently arranged and gradually rotate in a spiral form toward an upper portion or a lower portion.
Fig. 2 to 7 illustrate a cross section of a forgery prevention modification apparatus including a cholesteric liquid crystal display layer, a mobile device having a screen, and a method for confirming whether forgery prevention is modified or not using a polarizing film according to an embodiment of the present invention.
According to fig. 2 and 3, the anti-counterfeiting modification device including the cholesteric liquid crystal display layer according to an embodiment of the present invention may include a substrate layer (110), a design printing layer (120), a display layer (130) including a first display layer (131) and a second display layer (132), an adhesive layer (140), and an extension film layer (150) extending polymer molecules of a general plastic in a certain direction.
The substrate layer (110) may be located at the lowermost layer of the forgery prevention alteration device (100) including the cholesteric liquid crystal display layer, and various films used for manufacturing labels and the like in the fields of synthetic resin, paper, metal and the like may be used.
The design printing layer (120) is positioned on the substrate layer (110), and can be printed with a pattern that is different from a display layer (130) described later.
The display layer (130) may be printed on the base layer (110), or may be printed on the design printed layer (120) if the design printed layer (120) is provided.
The display layer (130) has a thickness of 15 μm or less, is located on the design printing layer (120), and may include a first display layer (131) and a second display layer (132).
The key element of whether the display layer (130) can be printed on the design printing layer (120) is the thickness of the printing layer, and if the thickness of the printing layer is thicker, the problem that available printing equipment is limited or printing cannot be performed can occur.
The lower limit of the average size of the ink particles that can be used for actual printing is 15 μm (for example, screen printing method), and the average ink particle size of the more optimized printing method (for example, gravure printing method, offset printing method) is 5 μm or less.
Therefore, the thickness of the display layer (150) according to an embodiment of the present invention can be 15 μm or less, and when the display layer is used for a packaging material or the like, the thickness of the printing layer is required to be thinner, and therefore, it is more preferably 5 μm or less.
Various embodiments of the invention may include: the first display layer (131) and the second display layer (132) are printed with an ink containing cholesteric liquid crystal only on one of the display layers, and the remaining display layers are printed with a normal ink or the first display layer (131) and the second display layer (132) are all printed with an ink containing cholesteric liquid crystal.
The ink used for printing the display layer is preferably an ink containing cholesteric liquid crystal and an ink not containing cholesteric liquid crystal, and the same color or an ink which looks the same color is used.
Although there is a case where a genuine product authentication method is disclosed to the outside, only a seller of a product and a counterfeit prevention service provider can confirm whether the product is a counterfeit product, and thus a consumer or a third party who produces or sells a counterfeit product cannot guess the genuine product authentication method with the naked eye.
In the first display layer (131) and the second display layer (132), the display layer is provided with a common ink instead of the ink containing the cholesteric liquid crystal, and the common ink is one of fluorescent ink (fluorescent ink), phosphorescent ink (phosphorescent ink), thermal ink (thermo-chromic ink), photochromic ink (photochromic ink), optically variable ink (optically variable ink) and magnetic ink (magnetic ink).
In addition, in the embodiment that the first display layer (131) and the second display layer (132) are printed by using the ink containing the cholesteric liquid crystal, the orientations of the cholesteric liquid crystal used in the display layers are different, and when the display layers are irradiated with the polarized light, different colors can be recognized, so that the hidden mark can be recognized to confirm whether the fake is changed or not.
The cholesteric liquid crystal powder can be cholesteric liquid crystal microcapsules, and the diameter of the cholesteric liquid crystal microcapsules is about 10 mu m on the printable average.
The display layer (130) formed by the ink containing the cholesteric liquid crystal is characterized in that the weight of the cholesteric liquid crystal powder in the total weight of the ink containing the cholesteric liquid crystal accounts for 1-30%, and at least part of the rest weight can be occupied by at least one of the common inks.
The display layer containing cholesteric liquid crystal in the display layer may be formed by mixing cholesteric liquid crystal powder and a thermosetting binder, and the cholesteric liquid crystal powder may be mixed with the binder by a weight of 30% or less, which is the maximum value that can be bonded to the base material layer (110) or the design printing layer (120).
Further, the thermosetting adhesive is preferably an Acrylate-based adhesive (Acrylate-based adhesive) in view of adhesiveness and stability.
Further, the higher the weight of the cholesteric liquid crystal powder, the higher the visibility at the time of authentication.
In the total weight of the ink containing cholesteric liquid crystal, at least a part of the remaining weight excluding the weight of cholesteric liquid crystal may be occupied by nematic liquid crystal or liquid crystal polymer which is an unusual ink.
Further, a part of the total weight of the ink is constituted by cholesteric liquid crystal, and the remaining part is constituted by nematic liquid crystal or liquid crystal powder, and for this input current, the alignment angle of nematic liquid crystal or liquid crystal polymer is adjusted, and polarization is irradiated at the time of verification, whereby the front and rear colors can be irradiated differently.
Complementary fluorescent dye can be added into the cholesteric liquid crystal of the ink containing the cholesteric liquid crystal, and the color of the added complementary fluorescent dye and the dye contained in the design printing layer (120) can form a complementary color contrast relation.
In this case, a pigment that has a complementary color contrast relationship with the complementary color fluorescent dye contained in the cholesteric liquid crystal may be added to the design printing layer (120).
The complementary color contrast relationship is a combination of colors that are generally located on opposite sides of each other in a hue ring, and when vermillion and green, yellow and blue, and the like are viewed side by side, the colors appear more intense and vivid due to their mutual influence.
Fig. 4 is an experimental sequence of verification with a polarizing film (polarizing viewer) after aligning the forgery prevention modification apparatus including the first display layer (131) containing the cholesteric liquid crystal (left side) to which the complementary color fluorescent dye is not added and the forgery prevention modification apparatus including the first display layer (131) containing the cholesteric liquid crystal (right side) to which the complementary color fluorescent dye is added.
Here, the first display layer (131) is in a trapezoidal pattern cross shape, and the right side containing a complementary fluorescent dye exhibits higher chromaticity than the left side.
The right-side anti-counterfeiting modification device for the comparative experiment comprises: a substrate layer comprising synthetic PP paper; a design print layer comprising a binder having a green pigment content of up to 15%; a first display layer formed by mixing and printing 10% of cholesteric liquid crystal microcapsules with the liquid crystal content of 7%, 89% of acrylate adhesives and 1% of cinnabar fluorescent dye; and the second display layer is formed by mixing and printing 10% of cholesteric liquid crystal microcapsules with the liquid crystal content of 7% and 90% of acrylate adhesive.
The experimental example shows that when a vermilion color complementary fluorescent dye which is in a complementary color contrast relation with green is added into cholesteric liquid crystal, the identification power can be improved.
The above-mentioned vermillion fluorescent dye is a fluorescent dye which is usually developed in the long wavelength UV356mn, and the display layer is one example of a screen printing method of printing 5 to 15 μm with a 150-mesh screen.
By utilizing the characteristics, the latent image is formed on the anti-counterfeiting pattern of the cholesteric liquid crystal, and the latent image of the cholesteric liquid crystal can be observed by naked eyes when the mobile equipment liquid crystal irradiates a bias.
An upper portion of the display layer (130) may be selectively laminated to the extension film layer (150), and an adhesive layer (140) bonding the two layers may be disposed between the extension film layer (150) and the display layer (130).
An extension film layer (150) is arranged on the upper part of the display layer (130), so that light refracted by the cholesteric liquid crystal ink is further refracted to increase the identification force of the identification pattern (hidden mark).
The stretched film is preferably formed of a Bi-Axially oriented polypropylene film (Bi-Axially oriented PP film) having improved optical characteristics and improved transparency.
Fig. 5 shows an example of a verification by a polarizing film (polarizing viewer) after arranging the forgery prevention alteration device not including the extension film layer (150) and the forgery prevention alteration device including the extension film layer (150).
Here, the display layer (130) is formed of a circular pattern, and the forgery prevention alteration device including the extension film layer (150) on the right side is observed to be more glittering and higher in chromaticity than the left side.
Further, as shown in the present experimental example, the effect of improving visibility of more glittering color exhibited by the extended film layer introduced into the polarization of the light-reflective cell phone was found as a result of comparison
The right-side anti-counterfeiting modification device for the comparative experiment comprises: a base material layer containing PP synthetic paper; a design print layer comprising a binder with a silver powder pigment content of up to 15%; a first display layer formed by mixing and printing 10% of cholesteric liquid crystal microcapsules with the liquid crystal content of 7% and acrylate adhesive; a second display layer formed by mixing and printing 10% of cholesteric liquid crystal microcapsules with the liquid crystal content of 7% and 90% of acrylate adhesive; a 30 μm layer of extended Film (OPP Film, Bi-Axially oriented PP Film).
Fig. 6 shows an example of a state in which the latent image is visualized on the identification pattern of the display layer (130) by irradiating the polarized light from the liquid crystal of the mobile device, and fig. 7 shows an example of a state in which the latent image identification pattern is visualized by allowing the polarized light to reach the forgery prevention device (100) including the cholesteric liquid crystal display layer by the polarizing film.
A more specific method of identifying a false alteration is explained in fig. 12 to 15 later, so as not to obscure the gist.
Various embodiments of the tamper-resistant modification device (100) including a cholesteric liquid crystal display layer according to the invention are described below with reference to fig. 8 to 11.
In the embodiments illustrated in fig. 8 to 11 below, the extension film layer (150) and the substrate layer (110) may be optionally additionally disposed.
First, according to fig. 8, the forgery prevention alteration device (100) including the cholesteric liquid crystal display layer according to an embodiment of the present invention may further include a polarizing layer (160) disposed with a polarizing film or an ink containing a polarizing substance or disposed with a polarizing film.
The polarizing layer (160) is a linear polarizing layer, a circular polarizing layer, an elliptical polarizing layer, or the like, and may be selectively provided in any form as required as long as it can transmit incident light by switching the polarization form.
Of course, the identification pattern can be arranged by using one of the circular polarization layers, namely, the polarization film containing cholesteric liquid crystal or the ink, and the identification pattern can be latent image on the polarization layer (160) by the combination of the polarization layers or the combination of the polarization layers and the common ink layer.
Further, one surface of the polarizing layer (160) may further include a display layer (130) on which the identification pattern is latent-imaged, and the display layer (130) may include the first display layer (131) and the second display layer (132).
As above, the first display layer (131) and the second display layer (132) may include: an example in which only one of the display layers is printed using an ink containing cholesteric liquid crystal, the remaining display layers are printed using a general ink, and a plurality of examples in which both the first display layer (131) and the second display layer (132) are printed using an ink containing cholesteric liquid crystal.
And a complementary fluorescent dye can be added into the cholesteric liquid crystal of the ink containing the cholesteric liquid crystal.
According to the present embodiment, in a state where non-polarized light is irradiated from top to bottom, when viewed from the upper side downward, a recognition pattern (first recognition pattern) can be displayed by the display layer (130) and the polarizing layer (160).
When the display layer (130) is illuminated with light from the lower side to the upper side, the other identification pattern (second identification pattern) is seen by the light filtered by the polarizing layer (190) in the upward view, and the other identification pattern (third identification pattern) is seen in the upward view.
That is, the security of the forgery prevention device (100) is improved to the maximum extent by making the identification pattern viewed differently depending on the irradiation direction of light and the line-of-sight direction.
A further embodiment of a tamper-proof device (100) comprising a cholesteric liquid crystal display layer comprising a polarizing layer is then described with reference to fig. 9.
The anti-counterfeiting transformation device (100) comprising the cholesteric liquid crystal display layer comprises the polarizing layer (160), the display layer (130), a phase difference film layer (17) with an engraved pattern (170a) formed on the upper side, and a coating layer (180) covering the phase difference film layer (170).
First, the retardation film is an optically anisotropic film, and exhibits functions such as optical compensation, view angle enlargement, and color compensation depending on the purpose.
In this embodiment, the retardation film widens the optical element having birefringence, converts linearly polarized light that is slightly obliquely incident upon the retardation film by rotating the retardation film into a polarized state that is directly orthogonal to the analyzer transmission axis, and allows the latent images of the display layer (130) and the polarizing layer (160) to be clearly seen even if the polarized light is obliquely incident upon the coating layer.
According to the present embodiment, the latent image recognition power of the display layer (130) and the polarizing layer (160) is improved by the phase difference film (170), and a recognition pattern partially deformed by the intaglio pattern (170a) is exhibited.
Still another embodiment of a tamper-proof device (100) comprising a cholesteric liquid crystal display layer comprising a polarizing layer is then described with reference to fig. 10.
The anti-counterfeiting device (100) comprising the cholesteric liquid crystal display layer of one embodiment of the invention can comprise a polarizing layer (160) and a display layer (130) containing phase difference ink.
Specifically, the display layer (130) may include: a first display layer (131) provided with a normal ink or an ink containing cholesteric liquid crystal, and a second display layer (132') provided with a phase difference ink in which phase difference film powder is mixed in the normal ink.
The common ink and the phase difference film powder of the second display layer may be 100: mixing at a ratio of 1 to 30.
According to the present embodiment, when light is irradiated from the bottom to the top, the light emerging in the alignment direction on the first display layer (131) passes through the second display layer (132') and is converted into a polarization state orthogonal to the transmission axis, thereby being irradiated to the top side more brightly.
A further embodiment of a tamper-resistant modifying device (100) comprising a cholesteric liquid crystal display layer is then described with reference to fig. 11.
According to the embodiment, liquid crystal inks (K, T) having different alignment structures are coated on the substrate layer (110), that is, one liquid crystal ink (K) is used as a cholesteric liquid crystal ink aligned in a spiral direction, and the remaining liquid crystal inks (T) are arranged as cholesteric liquid crystal inks aligned in a half-spiral direction.
And not only spiral or semi-spiral, but also liquid crystal inks with different specific pattern orientations.
Next, fig. 12 to 13 show an example of a forgery prevention modification apparatus (100) including a cholesteric liquid crystal display layer and a method for identifying a forgery prevention modification according to an embodiment of the present invention.
First, according to fig. 12 and 14, the anti-counterfeiting modification device (100) including the cholesteric liquid crystal display layer according to an embodiment of the present invention may include a QR code (10) and an identification pattern (20).
According to fig. 13, after the QR code (10) is first verified by the mobile device (50) having a screen, the second determination as to whether or not the pseudo-alteration is present can be visually recognized and determined by using a pseudo-alteration confirmation interface (40) induced by a polarizing film (fig. 5) or a mobile device application (30) having a screen, which will be described later.
The pseudo alteration confirmation interface (40) can be irradiated with polarized light of a specific pattern, and the irradiated polarized light reaches the anti-counterfeiting alteration device (100) including the cholesteric liquid crystal display layer, and a second discrimination process is performed by the polarized light as shown in fig. 12.
The false alteration confirmation interface (40) may use gray, ivory, yellow, blue or light green in addition to white, but may use a white background to most clearly recognize the recognition pattern (20).
The most preferred single color is white, which is an important factor in the present invention. Since polarized light is irradiated to the identification pattern with a white interface, the sharpness of the identification pattern is significantly improved compared to when polarized light is irradiated with other color interfaces.
The pseudo alteration confirmation interface (40) is such that 70% or more of the area of the interface may be composed of a single color background, and polarized light having a specific vibration direction may be irradiated. Further, the present invention can easily perform the second discrimination process without other polarizing films.
The method for discriminating forgery or alteration of the forgery or alteration preventing device (100) including the cholesteric liquid crystal display layer by the mobile device (50) having the screen will be described in detail with reference to fig. 15.
Step (a) first confirming the pseudo-alteration step: using QR codes
The step (a) is a process of recognizing the QR code (10) by using a camera mounted on a mobile device (50) having a screen, and determining whether or not the QR code is altered.
In the process of identifying the QR code (10) by using the camera, whether the QR code is changed or not can be judged, and a special application program (30) for switching the interface of the mobile device (50) with the screen to a special interface (40) can be downloaded, or the QR code can be guided to a special website for carrying out the whole process.
Step (b): switching the interface to a pseudo alteration confirmation screen:
after the first determination of whether or not the screen is pseudo-altered is made and the non-pseudo-altered QR code (10) is confirmed for the first time, a process of switching the interface of the mobile device (50) having the screen to the dedicated interface (40) necessary for the second determination may be performed.
Step (c): confirming with naked eyes the false alteration and the false alteration of the pattern printed on the QR code (10) using a false alteration confirmation interface
No step (c):
after the interface of a mobile device (50) having a screen is switched to a dedicated interface (40) required for the second determination, light (60) generated on the switched dedicated interface (40) is irradiated to the QR code (10), and the presence or absence of the identification pattern (20) or the presence or absence of pattern matching is used to perform the second determination of whether or not the pattern is artificially altered.
Here, since light irradiated from a mobile device (50) having a screen has a polarization characteristic, it is preferable that the dedicated interface (40) is rotated at an angle of 90 degrees and simultaneously the light (60) generated from the interface is irradiated to the identification pattern (20), and the presence or absence of the identification pattern (20) and whether the patterns match or not are determined.
The present invention can have other effects even if the effects are not described in the present specification, and new effects that cannot be seen in the prior art can be obtained from the organic combination relationship among the above-described structures.
Meanwhile, the embodiment illustrated in the drawings can be modified into other forms, and structures or equivalent substitutions within the scope of claims of the present invention can also be applied, but the embodiment made without creative efforts belongs to the protection scope of the present invention.
Claims (20)
1. A tamper-resistant device including a cholesteric liquid crystal display layer, comprising:
a substrate layer;
a design printing layer laminated on the base material layer and printed with a specific pattern;
and a display layer laminated on the design printing layer, including cholesteric liquid crystal including a latent image recognition pattern which is not recognized by naked eyes in a non-polarized light irradiated state.
2. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 1,
the display layer comprises a first display layer and a second display layer;
at least one of the first display layer and the second display layer is printed with an ink containing cholesteric liquid crystal or is a film containing cholesteric liquid crystal.
3. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 2,
the first display layer and the second display layer are printed in the same color by visual observation in a non-polarized light irradiated state.
4. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 2,
in a state of unpolarized light irradiation, the first display layer and the second display layer have a color synchronization rate of 98% based on visual observation.
5. A forgery-proof alteration device comprising a cholesteric liquid crystal display layer according to claim 3 or 4,
the first display layer and the second display layer are printed with inks containing cholesteric liquid crystals, respectively, and the cholesteric liquid crystals are oriented differently from each other.
6. A forgery-proof alteration device comprising a cholesteric liquid crystal display layer according to claim 3 or 4,
the first display layer contains the cholesteric liquid crystal;
the second display layer does not contain the cholesteric liquid crystal.
7. A forgery-proof alteration device comprising a cholesteric liquid crystal display layer according to claim 3 or 4,
the cholesteric liquid crystal is mixed with nematic liquid crystal or liquid crystal polymer.
8. A forgery-proof alteration device comprising a cholesteric liquid crystal display layer according to claim 3 or 4,
complementary fluorescent dye is mixed in the cholesteric liquid crystal;
the color of the complementary color fluorescent dye and the dye contained in the design printing layer form a complementary color contrast relation.
9. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 2, characterized in that
The cholesteric liquid crystal is in a liquid state or in a powder state in which the liquid state is physically microencapsulated.
10. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 2, characterized in that
The ink comprising the cholesteric liquid crystal comprises 1-30% of cholesteric liquid crystal powder by weight based on the total weight of the ink.
11. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 10, characterized in that
The ink including the cholesteric liquid crystal includes an oily solvent and an organic polymer;
the oily solvent is an oily solvent selected from the group consisting of N-methylpyrrolidone (N-methylpyrrolidinone), methyl ethyl ketone (Methylethylketone), toluene (toluene), cyclohexanone (cyclohexenone), and a group comprising these mixtures.
12. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 11, characterized in that
The organic polymer is selected from the group consisting of polyurethane (polyurethane) based polymers, polyvinyl alcohol (polyvinylalcohol) based polymers, polyacrylic acid (polyacrylic) based polymers, epoxy resin (epoxy) based polymers, melamine (melamine) based resins, isocyanate (isocyanate) based polymers, cellulose derivatives and mixtures comprising these.
13. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 12, characterized in that
The thickness of the cholesteric liquid crystal display layer is 1 to 15 μm.
14. A tamper-resistant device including a cholesteric liquid crystal display layer, comprising:
a polarizing layer provided with a polarizing film or an ink containing a polarizing substance or with a polarizing film;
and a display layer laminated on the polarizing layer, including cholesteric liquid crystal including a latent image recognition pattern that is not recognizable with naked eyes in a non-polarized light irradiated state.
15. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 14, wherein the device is characterized in that
And a transparent or semitransparent substrate layer is arranged on the opposite side of the laminated part of the display layer in the upper and lower surfaces of the polarization layer, or is exposed outside.
16. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 14, wherein the device is characterized in that
Further comprising: and a retardation film layer for changing the phase of the polarized light flowing in through the polarizing layer.
17. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 14, wherein the device is characterized in that
Further comprising: a coating layer laminated on an upper side of the phase difference film layer;
and the part of the two surfaces of the phase difference film layer, which faces the coating layer, is provided with an intaglio.
18. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 14, wherein the device is characterized in that
The display layer includes: a first display layer provided with a normal ink or an ink containing cholesteric liquid crystal; and
and a second display layer formed of a phase difference ink in which phase difference film powder is mixed in a common ink.
19. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 18, wherein the device is characterized in that
The phase difference ink is prepared by taking the total weight of the ink as a reference, and the weight of phase difference film powder accounts for 1-30%.
20. A tamper-evident device comprising a cholesteric liquid crystal display layer according to claim 14, wherein the device is characterized in that
The polarizing layer contains cholesteric liquid crystals.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2020-0057132 | 2020-05-13 | ||
| KR1020200057132A KR102432996B1 (en) | 2020-05-13 | 2020-05-13 | Means Preventing Forgery and Falsification Comprising Cholesteric Liquid Crystal Layer |
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| Publication Number | Publication Date |
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| CN113671732A true CN113671732A (en) | 2021-11-19 |
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| CN202110524198.3A Pending CN113671732A (en) | 2020-05-13 | 2021-05-13 | Anti-counterfeiting modification device comprising cholesteric liquid crystal display layer |
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| Country | Link |
|---|---|
| KR (1) | KR102432996B1 (en) |
| CN (1) | CN113671732A (en) |
| WO (1) | WO2021230619A1 (en) |
Cited By (1)
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|---|---|---|---|---|
| CN116300161A (en) * | 2023-02-21 | 2023-06-23 | 华南师范大学 | Method for regulating color of liquid crystal coating by utilizing ultraviolet light, product and application thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102528188B1 (en) * | 2022-06-07 | 2023-05-03 | 엔비에스티(주) | Forgery Prevention Means Including a Cholesteric Liquid Crystal Display Layer and an Interference Light Forming Layer |
| KR102474178B1 (en) * | 2022-06-07 | 2022-12-05 | 엔비에스티(주) | Forgery Prevention Means Including a Cholesteric Liquid Crystal Display Layer and a Light Scattering Layer |
| KR102632900B1 (en) * | 2022-07-01 | 2024-02-05 | 엔비에스티(주) | Forgery prevention means applied with three-step authentication method and forgery authentication method using the same |
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Also Published As
| Publication number | Publication date |
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| KR102432996B1 (en) | 2022-08-17 |
| WO2021230619A1 (en) | 2021-11-18 |
| KR20210138974A (en) | 2021-11-22 |
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