KR102167218B1 - Fingerprint Recognition Film - Google Patents

Abstract

In the present application, even when applied to a structure with a curvature such as a flexible structure or a bending structure, a defect such as a lifting phenomenon does not occur, and a phenomenon that may affect performance such as a change in the center diffraction wavelength of a diffraction optical element While being prevented, a fingerprint recognition film having excellent durability and fingerprint recognition function can be provided.

Description

Fingerprint Recognition Film {Fingerprint Recognition Film}

The present application relates to a fingerprint recognition film and a display device including the same.

The fingerprint recognition function is used in various fields requiring security, such as various mobile devices, electronic commerce, or internet banking.

Fingerprint recognition methods are various, such as optical, ultrasonic, capacitive, electric field measurement, or thermal sensing methods. For example, the optical fingerprint recognition method detects light scattered from a ridge of a fingerprint. There is a scattering method and a so-called total reflection method for detecting light totally reflected from the surface of a fingerprint contact portion corresponding to a valley portion of the fingerprint.

Various optical fingerprint recognition films that are applied to display devices to enable fingerprint recognition are being studied. When such films are applied to a flexible display, etc., there is a problem that the function is deteriorated due to the lifting phenomenon in the curved part. There is a problem in that a change in functions such as center wavelength shifting occurs in optical elements such as diffractive optical elements that play an important role in recognition.

The present application provides a fingerprint recognition film. In this application, a fingerprint recognition film is provided that has excellent fingerprint recognition function and durability reliability, does not cause defects such as lifting even when applied to a flexible display device, and prevents functional changes such as shifting of the center wavelength. It aims to do.

The fingerprint recognition film of the present application includes a first adhesive layer; Transparent film layer; A second adhesive layer; And diffractive optical elements in the above order.

A desired fingerprint recognition film may be provided through the adoption of the laminated structure. For example, the adoption of the structure prevents shifting of the center diffraction wavelength of the diffractive optical element included in the film, has good durability and fingerprint recognition, and even when applied to a flexible device, It is possible to provide a film without occurrence. In general, diffractive optical elements have selectivity for diffracted light depending on the type of material constituting the diffraction grating, manufacturing method, and refractive index, and the center diffraction wavelength is the wavelength at the point where the diffraction efficiency of the diffraction optical element is maximum. Can mean The central diffraction wavelength may change due to contraction or expansion of the diffractive optical element or influence of external materials. When the initially designed central diffraction wavelength is changed, the fingerprint recognition function may be deteriorated. However, the fingerprint recognition film of the present application can exhibit excellent durability by suppressing the change in the center diffraction wavelength of the diffractive optical element to a minimum.

In one example, at least one of the first and second pressure-sensitive adhesive layers included in the fingerprint recognition film may be a pressure-sensitive adhesive layer having a relatively low refractive index, and the other may be a pressure-sensitive adhesive layer having a relatively high refractive index.

For example, the first pressure-sensitive adhesive layer may have a refractive index greater than 1.42, and the second pressure-sensitive adhesive layer may have a refractive index of 1.42 or less.

The refractive index referred to in this specification is the refractive index at room temperature measured for a reference wavelength of 589 nm, unless otherwise specified. The term room temperature refers to a natural temperature that is not heated or reduced, and may be, for example, any temperature in the range of about 10°C to 30°C, about 25°C, or about 23°C. In addition, unless otherwise specified, the unit of temperature referred to in this specification is °C.

The refractive index of the first pressure-sensitive adhesive layer may be in the range of about 1.45 to 1.50 in another example, and the refractive index of the second pressure-sensitive adhesive layer is in the range of about 1.32 to 1.42, in the range of about 1.35 to 1.42, or about 1.40 in another example. It may be in the range of about 1.42.

As the first and second pressure-sensitive adhesive layers, as long as they have a refractive index in the above range, a conventional optically transparent pressure-sensitive adhesive layer may be applied without particular limitation. Optically transparent adhesives are known by the so-called OCA (Optically Clear Adhesive).

For example, as the first pressure-sensitive adhesive layer, an acrylic OCA, that is, an optically transparent acrylic pressure-sensitive adhesive layer may be used. The acrylic pressure-sensitive adhesive layer is a polymer having an alkyl (meth)acrylate unit having an alkyl group having an alkyl group of 1 to 12 carbon atoms and a crosslinkable functional group, and a polymer having a copolymerizable monomer unit having a hydroxy group or a carboxyl group, etc. It is obtained by crosslinking with a crosslinking agent, an aziridine crosslinking agent, a metal chelate crosslinking agent, or the like, and such a conventional acrylic OCA has a refractive index of about 1.47. In addition, a monomer unit having an aromatic group such as 2-phenylethyl acrylate or a monomer unit having a biphenyl group is introduced into the polymer, or by introducing or blending an inorganic zirconium carboxyethyl acrylate, the refractive index thereof is increased, or vice versa. Also known is an acrylic OCA whose refractive index is lowered by introducing a fluorine-based functional group or additive. In the present application, an appropriate type having a desired refractive index may be selected and used from among the known acrylic OCAs as described above.

In the present application, the thickness of the first pressure-sensitive adhesive layer is not particularly limited, but may be in the range of about 20 μm to 300 μm. The thickness of the first pressure-sensitive adhesive layer, in another example, 30㎛ or more, 40㎛ or more, 50㎛ or more, 60㎛ or more, 70㎛ or more, 80㎛ or more, 90㎛ or more, 100㎛ or more, 110㎛ or more, 120㎛ It may be more than, 130㎛ or more, 140㎛ or more, 300㎛ or less, 280㎛ or less, 260㎛ or less, 240㎛ or less, 220㎛ or less, or 200㎛ or less. This range may enable stable attachment of the other elements when other elements such as a decor film or a glass substrate are attached to the top of the first pressure-sensitive adhesive layer in the application state of the fingerprint recognition film to be described later.

As the second pressure-sensitive adhesive layer, one having a refractive index within the above-mentioned range may be selected from among optically transparent pressure-sensitive adhesive layers known under the name of so-called OCA (Optically Clear Adhesive).

A commonly known silicone-based OCA, that is, an optically transparent silicone-based pressure-sensitive adhesive layer, is an OCA capable of exhibiting a refractive index within the aforementioned range. In general, the refractive index of silicon-based OCA is set in the range of about 1.41. Therefore, in the present application, a silicone-based adhesive may be applied as the second adhesive layer, but is not limited thereto. That is, in the present application, any type can be applied as long as it is optically transparent and exhibits a refractive index in the above-mentioned range.

In one example, the thickness of the second pressure-sensitive adhesive layer may be in the range of 10 μm to 200 μm, but is not limited thereto. In another example, the thickness may be about 10 µm or more, 12 µm or more, 14 µm or more, 16 µm or more, 18 µm or more, 20 µm or more, 22 µm or more, 24 µm or more, or 25 µm or more, and 200 µm or less, It may be 190 μm or less, 180 μm or less, 170 μm or less, 160 μm or less, or 150 μm or less.

In the present application, the transparent film layer positioned between the first and second pressure-sensitive adhesive layers serves to prevent changes in the center diffraction wavelength of the diffractive optical element due to the influence of the first pressure-sensitive adhesive layer having a relatively high refractive index. can do. The refractive index of the transparent film layer is not particularly limited, but it may be preferably equal to or higher than the first pressure-sensitive adhesive layer and not too much larger than the second pressure-sensitive adhesive layer. Accordingly, fingerprint recognition performance can be improved. As the transparent film layer, for example, one having a refractive index in the range of about 1.41 to 1.60 may be used. As the transparent film layer, for example, a polyethylene terephthalate (PET) film, a polyester film such as a polybutylene terephthalate film or a polycarbonate film, a fluoropolymer film such as a polytetrafluoroethylene film, a polyethylene film or poly Polyolefin film such as propylene film, acrylic film, polybutene film, polybutadiene film, vinyl chloride copolymer film, polyurethane film, ethylene-vinyl acetate film, ethylene-propylene copolymer film, ethylene-ethyl acrylate copolymer film, ethylene -A methyl acrylate copolymer film, a polyamide film, or a polyimide film may be applied, but is not limited thereto.

The thickness of the transparent film layer may be, for example, in the range of about 10 μm to 500 μm, but is not limited thereto, and may be appropriately changed in consideration of the performance of the fingerprint recognition film.

The fingerprint recognition film may further include a low refractive index layer under the diffractive optical element. In the above, the lower portion of the diffractive optical element refers to a surface direction opposite to the surface of the diffractive optical element on which the second adhesive layer is present, and thus, when the low refractive layer is included, the second adhesive layer and the low refractive layer The diffractive optical element may be disposed between. Optical fingerprint recognition may be possible by this structure. The low refractive layer may be the same pressure-sensitive adhesive layer as the second pressure-sensitive adhesive layer.

In the fingerprint recognition film of the present application, light originating from an external light source may exist as two rays of different angles. For example, one of the light rays may always be totally reflected in the fingerprint recognition film (hereinafter, this light ray may be referred to as the first light ray or light A), and the other light ray is the fingerprint recognition film. It may be designed not to be totally reflected within (hereinafter, such a light ray may be referred to as a second light ray or light B). 1 is a diagram illustrating a case in which the fingerprint recognition film is combined with a display device or a sensor to represent a fingerprint recognition function according to an example of the present application. In FIG. 1, a first ray is indicated by light A, and a second ray Is denoted by light B. As shown in FIG. 1, the first ray (light A) can be totally reflected in the diffractive optical element, and the second ray (light B) is a fingerprint recognition film according to a pattern of a material (fingerprint) in contact with the outside of the fingerprint recognition film. Whether or not total reflection is determined in the surface layer, and after the total reflection reaches or passes through the fingerprint recognition film, it can be identified by a sensor located under the fingerprint recognition film. In addition, in the present application, the surface layer of the fingerprint recognition film may be an upper surface of a film in contact with air, or an upper surface of a film directly or indirectly in contact with an object having a pattern such as a fingerprint.

As shown in the drawing, in one embodiment, the diffractive optical element may include first and second light control units. The light control units are configured to perform a predetermined function only for light incident at a specific angle.

Accordingly, as described below, the first light control unit may be configured to generate the first light ray, and the second light control unit may be configured to generate the second light ray.

As shown in the drawing, the first light control unit transmits light incident to the lower surface of the first light control unit at a first angle θ ₀ through the low refractive index layer and a second angle θ _A different from the first angle θ ₀ . ), and may be a device capable of converting into light A directed toward the second pressure-sensitive adhesive layer. In one example, the emission surface of the first light control unit through which the light of the second angle θ _A is emitted may be one surface other than the lower surface of the first light control unit, or an inner area. The fingerprint recognition film of the present application may be configured to emit light of a second angle θ _A from the side and/or the top surface of the first light control unit, or from a certain area and/or point inside the first light control unit. have. At this time, the light of the second angle θ _A is, for example, at the lower surface of the second pressure-sensitive adhesive layer, such as the interface between the second pressure-sensitive adhesive layer and the diffractive optical element, and, for example, the interface between the low refractive index layer and the diffractive optical element. It may be light that is totally reflected on the upper surface of the low refractive layer such as. In the present application, the "interface" may mean an interface between two adjacent layers or an interface between heterogeneous media placed in a path through which light passes. In the present application, an angle is an angle formed by a direction of light traveling from a normal to a fingerprint recognition film (or a light-incident layer or a light-incident surface) placed on a horizontal plane, and its unit is a degree, which is greater than 0 to less than 90 degrees. It can have a size. In addition, the angle of light may be referred to as an incident angle or an emission angle according to a relative position of each component according to the traveling direction of the light.

A second light control portion is, for example, is totally reflected by the lower surface of the second adhesive layer 2 to the light incident to the second angle (θ _A) in the light control, the second angle light (A) and a of a (θ _A) The light _{B at} a third angle θ _B different from the second angle θ _A may be emitted to the lower surface of the second pressure-sensitive adhesive layer. In one example, the emission surface of the second light control unit through which the light of the second angle θ _A and the light of the third angle θ _B are emitted is one surface other than the lower surface of the second light control unit or any interior Can be a realm. More specifically, the fingerprint recognition film of the present application includes light and a third angle of a second angle θ _A at a side and/or an upper surface of the second light control unit or a region and/or a point inside the first light control unit. It may be configured so that the light ( _B ) of (θ _B ) can be emitted. At this time, the light of the third angle θ _B is not totally reflected at the lower surface of the second adhesive layer, for example, at the interface between the second adhesive layer and the diffractive optical element, and the lower surface of the second adhesive layer or the second adhesive layer It may be transmitted light.

Since the diffractive optical element of the present application can be divided into two parts that can control the angle or path of light differently from each other, toward the second adhesive layer located on the diffractive optical element, specifically, the second adhesive With respect to the layer, more specifically, to the lower surface of the second pressure-sensitive adhesive layer, two lights (A and B) having different angles can be provided (emitted).

In one example, in the fingerprint recognition film of the present application, the light of the first angle θ _A emitted from the first light control unit toward the second adhesive layer satisfies the following relational equations 1 and 2, and the lower surface of the second adhesive layer And it may be provided so that total reflection on both the upper surface of the low refractive index layer. The first light control unit converts the light incident on the lower surface at a first angle θ ₀ to light at a second angle θ _A satisfying the following relational equations 1 and 2, and converts the upper surface of the diffractive optical element or It can be emitted toward the lower surface of the second adhesive layer. The relational expression described below can be obtained using Snell's law.

[Relationship 1]

θ _A > (180 degrees/π) × sin ^-1 (n ₂ /n ₃ )

Relational equation 1 is that the light of the first angle θ _A traveling from the diffractive optical element to the second pressure-sensitive adhesive layer is totally reflected at the lower surface of the second pressure-sensitive adhesive layer, for example, at the interface between the diffractive optical element and the second pressure-sensitive adhesive layer. The conditions are exemplified. In the above relational equation 1, n ₂ is the refractive index of the second pressure-sensitive adhesive layer, n ₃ is the refractive index of the first light control unit or the second light control unit of the diffractive optical element, and n ₃ is greater than n ₂ .

[Relationship 2]

θ _A > (180 degrees/π) × sin ^-1 (n ₄ /n ₃ )

Relational formula 2 is, when the light satisfying the relational expression 1 is totally reflected from the lower surface of the second pressure-sensitive adhesive layer and is incident on the diffractive optical element and then directed to the low refractive layer, the upper surface of the low refractive layer, for example, the low refractive layer and diffraction optics Conditions for total reflection at the interface of the device are exemplarily specified. In the relational expression 2, n ₃ is a refractive index of the first light control unit or the second light control unit of the diffractive optical element, n ₄ is the refractive index of the second pressure-sensitive adhesive layer, and n ₃ is greater than n ₄ .

The fingerprint recognition film of the present application may be provided so that total reflection light always exists in a predetermined laminated structure. In the present application, since the light of the second angle θ _A is always total reflection regardless of whether or not the fingerprint touches, the amount of light may be maintained at a certain level in the fingerprint recognition film. And, as described below, since the light (the second ray) of the angle (θ _{B '} ) used for fingerprint recognition is from the light of the angle (θ _B ) converted from the total reflection light, the angle θ _A Light at an angle θ _{B '} for generating an image may also be kept constant in the fingerprint recognition film regardless of whether or not the fingerprint is in contact.

The second light control unit transmits light that is totally reflected from the lower surface of the second pressure-sensitive adhesive layer and the upper surface of the low-refractive-index layer and enters the second light control part at a second angle θ _A , and the upper surface of the second light control part or the second pressure-sensitive adhesive layer toward the lower surface of the can be emitted as light (B) of the second optical angle (a) and the second angle (θ _a) is different from the third angle (θ _B) of (θ _a). That is, the second light control unit may convert a part of light _A having an angle θ _A into light _B having an angle θ _B. The degree of conversion, that is, the rate at which light (A) incident on θ _A is converted to light (B) of θ _B and emitted is not particularly limited, for example, appropriately adjusted in the range of more than 0% to less than 100% Can be. At this time, θ _A And θ _B may be a (incident) angle of each of the light emitted from the first light control unit and the light emitted from the second light control unit with respect to the lower surface of the second adhesive layer, which is an incident surface. In the present application, light of a third angle θ _B is generated by the second light control unit regardless of whether or not a fingerprint is in contact.

In the present application, light of the third angle θ _B generated by the second light control unit may be used for fingerprint recognition, as described below. In order to be used for fingerprint recognition, the light of the third angle (θ _B ) emitted from the second light control unit is not totally reflected in the fingerprint recognition film, but passes through the second adhesive layer and reaches the surface layer of the fingerprint recognition film in contact with the fingerprint. shall.

Regarding the third angle (θ _B ), in the fingerprint recognition film of the present application, the light of the third angle (θ _B ) emitted from the second light control unit satisfies the following relational equation 3, so that the second pressure-sensitive adhesive layer is It may be provided to be transparent.

[Relationship 3]

θ _B <(180 degrees/π) × sin ^-1 (n ₂ /n ₃ )

Relational expression 3 exemplarily stipulates a condition in which light at a third angle θ _B directed from the second light control unit of the diffractive optical element toward the second adhesive layer is not totally reflected on the lower surface of the second adhesive layer. Relational Equation 3 refers to a condition in which light of an angle θ _B emitted from the second light control unit can pass through the lower surface of the second adhesive layer or the second adhesive layer. In the relational equation 3, n ₂ is the refractive index of the second pressure-sensitive adhesive layer, n ₃ is the refractive index of the first light control unit or the second light control unit of the diffractive optical element, and n ₃ is greater than n ₂ .

In one example, the fingerprint recognition film of the present application may further include a transparent film layer through which the fingerprint may directly or indirectly contact. When the fingerprint recognition film includes a transparent film layer, the transparent film layer may be located on the first pressure-sensitive adhesive layer. The fingerprint recognition film may sequentially include a transparent film layer, a first adhesive layer, a transparent film layer, a second adhesive layer, a diffractive optical element, and a low refractive index layer. Unless otherwise defined, the term “transparent” used in relation to the properties of a layer in the present application means that the transmittance for at least one light or the average transmittance in the visible region of a wavelength of 380 nm to 780 nm is 65% or more, 70% or more, 75% or more, 80% or more, 85% or more, 90% or more, or 95% or more, and may mean a case in the range of about 100% or less or about 100% or less.

The present application also relates to a fingerprint identification device comprising the fingerprint identification film. The device may include the fingerprint recognition film, a light source, and a sensor. The device may be configured such that information of a fingerprint in contact with the fingerprint recognition film can be transmitted to the sensor. For example, in the device, the fingerprint recognition film, the light from the light source passes through the low refractive index layer of the fingerprint recognition film, and once the first light control unit and the second light control unit of the diffractive optical element are incident in the sequence. Can be arranged to be able to. According to the above configuration, light incident to the first light control unit through the low refractive layer is always at an angle that can be totally reflected at the interface between the second adhesive layer and the diffractive optical element and the interface between the low refractive layer and the diffractive optical element (the above It is incident to the second light control unit as light of angle θ _A ), Light is totally reflected in the diffractive optical element regardless of whether or not the fingerprint and the fingerprint identification film are in contact. In addition, the second light control unit converts some of the incident light into second light rays and emits it from the diffractive optical element toward the second pressure-sensitive adhesive layer. Angle θ _B in the second light control unit Θ _A not converted to light of The light of is totally reflected at the interface between the low refractive layer and the diffractive optical element. Also, the angle θ _B The light incident on the lower surface of the second pressure-sensitive adhesive layer passes through the second pressure-sensitive adhesive layer and enters the transparent film layer, while the angle θ _B It may be converted (refracted) into light having a fourth angle θ _{B ′} different from and incident on the transparent film layer. In the present application, the light of the fourth angle (θ _{B '} ) is transmitted through the ridge of the fingerprint, which is the contact part between the transparent film layer and the fingerprint, and total reflection in the valley of the fingerprint, which is the non-contact part of the transparent film layer and the fingerprint. A fingerprint recognition film may be configured to be. And, the light totally reflected in the valley part of the fingerprint passes through the second adhesive layer and the diffractive optical element, reaches the low refractive layer or transmits the low refractive layer, so that the fingerprint recognition film of the present application can be recognized by the sensor. This can be configured. If the light of the fourth angle (θ _{B ')} passes through the upper surface of the transparent film layer on the ridge (ridge) of the fingerprint, it may be made of the scattered and / or reflected with transmission.

The inventor of the present application, in relation to the sheet and device for fingerprint recognition or input, in Korean Patent Application No. 10-2017-0147008, one of the interfaces through which total reflection of light can always be totally reflected is The invention which becomes the top surface, that is, the upper surface of the transparent film layer, has been proposed. The sheet and device proposed in the above application are also intended to solve the problems of the prior art, but found a problem that some of the total reflected light may be lost due to various causes. As a cause of loss of total reflection light, contamination of the transparent film layer, contact of moisture with the transparent film layer, or a difference in pressure applied to a fingerprint may be mentioned. However, in the present application, regardless of whether or not the fingerprint is in contact, the angle (θ) that can be converted into light (θ _{B '} ) of an angle used for fingerprint identification while always having total reflection within a predetermined layered structure and passing through a predetermined path. _Since the interface through which the total reflection light of _A ) is totally reflected is located inside the sheet, not the surface of the sheet, there is an advantage that it is less sensitive to external factors such as contamination of the transparent film layer or the state of fingerprints.

According to an exemplary embodiment of the present application, in order to perform the above functions, the fingerprint recognition film of the present application may be configured or provided as follows.

In one example, the diffractive optical element of the present application may include the first light control unit and the second light control unit described above. Specifically, the first light control unit and the second light control unit may include diffractive optical elements having different functions from each other, and the diffractive optical element may be a holographic optical element (HOE) in the form of a film. Holographic is a technique for recording an interference pattern on a photosensitive medium to reproduce a three-dimensional image called a hologram. In addition, holographic film refers to a film on which holographic recording is recorded, and refers to a film capable of recording an interference pattern using recording light on a film having very small photosensitive particles, and reproducing it using reproduction light. can do. Since the holographic film performs a function only for recorded light and may not perform a required function for light other than the recorded light, the case of using a holographic film in the first light control unit and the second light control unit , It is particularly advantageous for controlling the angle, light path and/or amount of light required in the present application.

The holographic film may include a photosensitive material as a recording medium. As the photosensitive material, photopolymer, photoresist, silver halide emulsion, dichromated gelatin, photographic emulsion, photothermoplastic, or optical A photorefractive material or the like can be used. In one example, the holographic film may include a photopolymer as a photosensitive material, and specifically, a film made of only a poropolymer, or a photopolymer layer and a substrate for the layer together. It may be a film of a multi-layer structure including. In this case, the substrate used with the photopolymer may be a transparent substrate, for example, polycarbonate (PC), polypropylene (PP), polyamide (PA), polyethylene terphthalate (PET), or triacetylcellulose. It may be a substrate including (TAC) and the like, but is not particularly limited.

In one example, diffraction efficiencies of the first and second light control units may be the same or different from each other. The first light control unit may have the same diffraction efficiency over the entire area, and the second light control unit may also have the same diffraction efficiency over the entire area, and the diffraction efficiency of each light control unit may be the same or different from each other. have.

In one example, the first light control unit and the second light control unit may be partial regions formed on one layer by only different angles or diffraction patterns of recording light. Alternatively, a diffractive optical element may be formed by directly attaching the first light control unit and the second light control unit to form a single layer, or by attaching the first light control unit and the second light control unit separately through another medium. have.

If the above-described transmittance is satisfied, the type of the transparent film layer is not particularly limited. For example, it may include glass or a polymer resin. As a polymer resin, a polyester film such as PC (Polycarbonate), PEN (poly(ethylene naphthalate)) or PET (poly(ethylene terephthalate)), an acrylic film such as PMMA (poly(methyl methacrylate)), or PE (polyethylene naphthalate) ) Or a polyolefin film such as PP (polypropylene) may be used, but is not limited thereto. In one example, the transparent film layer may have a configuration in which the plurality of glass or polymer resins are laminated. Even in the case of having such a lamination configuration, a transparent film layer may be provided to perform the function required in the present application and satisfy the following relational expression.

In one example, the transparent film layer may further include one or more of a functional film composed of a hardness reinforcing film, an antifouling film, an antireflection film, and a decor film. For example, when the transparent film layer includes glass and a functional film, the glass may be positioned on the surface of the fingerprint recognition film in contact with the fingerprint as a so-called cover glass, and the functional film is between the glass and the second adhesive layer. May be intervened. Alternatively, any one or more of the functional films may be positioned on the glass. Even in the case of having such a configuration, the transparent film layer may be provided to perform the functions described in the present application and satisfy the relational expression prescribed in the present application.

In one example, the low refractive layer may be a pressure sensitive adhesive layer that satisfies the refractive index and the relational expression specified in the present application. Specifically, the low refractive layer may be a low refractive OCA of the same type as the above-described second pressure-sensitive adhesive layer.

In the present application, each of the low refractive index layer, the diffractive optical element, the second adhesive layer, and the transparent film layer may have the same or different refractive index. In one example, the layers may each independently have a refractive index in the range of greater than 1 to 5 or less, or greater than 1 to 3 or less, and the difference in refractive index between the layers may be 0.0001 to 2 or less. In the case of the diffractive optical element, the refractive indices of the first and second light control units may be adjusted to be the same or different within a range capable of performing the functions required in the present application.

In one example, the refractive index of the second pressure-sensitive adhesive layer may be smaller than the refractive index of the diffractive optical element and the refractive index of the transparent film layer. Similarly, the refractive index of the low refractive index layer may be smaller than the refractive index of the diffractive optical element and the refractive index of the transparent film layer. Although not particularly limited, when the refractive index relationship is satisfied, the difference in refractive index between the low refractive layer and the diffractive optical element, or the low refractive layer and the transparent film layer may be 0.1 or less.

In one example, the transparent film layer may have a higher refractive index than the diffractive optical element. Although not particularly limited, when the refractive index relationship is satisfied, the difference in refractive index between the transparent film layer and the diffractive optical element may be 0.05 or less.

In the present application, the thickness of the second pressure-sensitive adhesive layer, the low refractive layer, the diffractive optical element, the transparent film layer, or other components that may be included is not particularly limited. For example, if the function of the fingerprint recognition film described in the present application is exhibited, the thickness of the components is not limited, and illustratively, the lower limit may be 0.1 µm or more or 1 µm or more, and the upper limit is 1,000 It may be less than or equal to 500 μm.

In the fingerprint recognition film of the present application, the light emitted from the second light control unit at a third angle θ _B and transmitted through the second pressure-sensitive adhesive layer is whether an object with a different height exists on the transparent film layer or the pattern of the object. Depending on how this is, whether or not total reflection on the upper surface of the transparent film layer may be determined. In this connection, the refractive index of the transparent film layer is higher than the refractive index of the second pressure-sensitive adhesive layer, the third angle (θ _B) The second claim, while the light is transmitted through the second pressure-sensitive adhesive layer joined to a lower pressure-sensitive adhesive layer 3 angle (θ _B with ) is different from the fourth angle (θ _{B ')} a transparent if incident on the film layer, the fourth angle (θ _B') of the reader film of the present application to the light so as to satisfy the relational expressions 4 and 5 can be provided in have.

[Relationship 4]

θ _{B '} > (180 degrees/π) × sin ^-1 (n ₀ / n ₁ )

Equation 4 is obtained by defining a condition the light of the fourth angle (θ _{B ')} is totally reflected by the upper surface of the transparent film layer in contact with air by way of example. In the above relational formula 4, n ₀ is 1 as the refractive index of air, and n ₁ is the refractive index of the transparent film layer.

[Relationship 5]

θ _{B '} <(180 degrees/π) ×sin ^-1 (n _h / n ₁ )

Equation 5, when the body heights with different patterns in contact with the transparent film layer, on the upper surface of the transparent film layer to the object and the transparent film layer, the height having a different pattern is in direct contact with the fourth angle (θ _{B ')} The conditions under which light is transmitted (or transmission, scattering, and reflection may occur simultaneously) are exemplarily defined. In the above relational equation 5, n ₁ is a refractive index of the transparent film layer, and n _h is a refractive index of a portion of objects having patterns having different heights in direct contact with the transparent film layer. In this case, an object having a pattern having a different height may be a fingerprint, and a portion of an object having a pattern having a different height that directly contacts the transparent film layer may be a ridge of the fingerprint. On the other hand, a portion of objects having different height patterns that does not directly contact the transparent film layer may be a valley of the fingerprint, and since the valley portion is occupied by air, the refractive index of the valley portion is 1 (=n ₀ ) Can be seen as. As such, the light of the angle (θ _{B '} ) is totally reflected at the interface between the transparent film layer and air when there is no object on the transparent film layer, but when an object having a pattern having a different height contacts the transparent film layer May be light transmitted (or transmission, scattering, and reflection may occur at the same time) from a ridge of an object to the transparent film layer.

In addition, in the present application, the fingerprint recognition film may be provided so that the light of the fourth angle θ _{B '} totally reflected from the upper surface of the transparent film layer in contact with air can pass through the upper surface of the second adhesive layer. have. When the refractive index of the transparent film layer is greater than that of the second pressure-sensitive adhesive layer, since total reflection should not occur on the upper surface of the second pressure-sensitive adhesive layer, that is, the surface of the second pressure-sensitive adhesive layer and the transparent film layer, the light of the fourth angle (θ _{B '} ) May satisfy the following relational expression 6.

[Relationship 6]

θ _{B '} <(180 degrees/π) × sin ^-1 (n ₂ /n ₁ )

Equation 6, when the refractive index of the transparent film layer is greater than the refractive index of the second pressure-sensitive adhesive layer, without a total reflection occurs at the interface between the transparent film layer and the second adhesive layer, and the fourth angle light to the second (θ _{B ')} Conditions that can penetrate the upper surface of the pressure-sensitive adhesive layer are exemplarily defined. In the above relational formula 6, n ₁ is the refractive index of the transparent film layer, n ₂ is the refractive index of the second pressure-sensitive adhesive layer, and n ₁ is greater than n ₂ .

In addition, in the fingerprint recognition film of the present application, the light totally reflected at the interface between the transparent film layer and the air among the light of the fourth angle (θ _{B '} ) passes through the second adhesive layer and the diffractive optical element, and the lower surface of the low refractive layer It may be provided to reach or pass through the low refractive index layer. Light reaching the low refractive layer or passing through the low refractive layer can be recognized by a sensor located below the low refractive layer. To this end, the light transmitted through the second pressure-sensitive adhesive layer should not be totally reflected on the upper surface of the low refractive layer, that is, at the interface between the diffractive optical element and the low refractive layer. In this connection, the fourth angle may satisfy the following relation of light (θ _{B ')} 7.

[Relationship 7]

θ _{B '} <(180 degrees/π) × sin ^-1 (n ₄ /n ₁ )

Relational Equation 7 shows that the light of the fourth angle (θ _{B '} ) is totally reflected at the interface between the transparent film layer and the air, then passes through the second pressure-sensitive adhesive layer and the diffraction optical element, reaches the low refractive layer (lower surface) or the low refractive layer The conditions that can penetrate through are exemplarily defined. In the above relational formula 7, n ₁ is the refractive index of the transparent film layer, and n ₄ is the refractive index of the low refractive index layer.

As described above, when the angle θ _{B '} of light totally reflected from the surface layer of the transparent film layer satisfies the above relations 6 and 7, the sensor present under the fingerprint recognition film reaches the low refractive layer (lower surface) or Transmitted light can be recognized. That is, the fingerprint recognition film of the present application is the top surface of the transparent film layer in contact with air, among the light of the fourth angle (θ _{B '} ) resulting from the light of the third angle (θ _B ) emitted by the second light control unit. The user's fingerprint using a method of identifying the difference in the amount of light transmitted from the (surface layer of the fingerprint recognition film) and the light transmitted from the transparent film layer and the direct contact part of the object (or transmission, scattering, and reflection may occur simultaneously) Makes it possible to be recognized.

This application does not directly use light that is always totally reflected in the fingerprint recognition film for fingerprint identification. More specifically, the present application in a first portion of light of the second angle (θ _A) is provided in the light control portion is always total reflection regardless of whether the fingerprint contact with, a different third angle θ _A by the second light control portion ( It is converted into light of θ _B ) and emitted toward the transparent film layer, and the light of the fourth angle (θ _{B '} ) reaching the surface of the transparent film layer is transferred from the surface of the transparent film layer to the inside of the fingerprint recognition film. In the case of total reflection and transmission outside the fingerprint recognition film (or transmission and scattering, and reflection may occur simultaneously), the difference in the amount of light of these lights is used for fingerprint identification. That is, among the light of the θ _{B '} angle, the amount of light that is totally reflected in the non-contact part with the fingerprint and proceeds to the sensor and the amount of light transmitted from the contact part with the fingerprint (or transmission, scattering, and reflection may occur at the same time) reduces the light intensity. The difference in light intensity is used for fingerprint identification.

In addition, in the present application, the light of the angle θ _{B '} is generated from light that is always totally reflected in the fingerprint recognition film regardless of the presence or absence of a fingerprint. Therefore, in the present application, the amount of light used for fingerprint identification can also be kept constant by using light that always reflects the inside of the fingerprint recognition film, and as a result, the transparent film layer and air among the light of the angle θ _{B '} The difference in the amount of light between the light totally reflected at the interface of the transparent film layer and the light transmitted (or transmitted, scattered, and reflected at the same time) at the direct contact portion of the object can be more clearly recognized by the sensor. Furthermore, in the present application, the angle θ _B generated regardless of the presence or absence of a fingerprint or Among the light of θ _{B '} ), the light that is totally reflected at the interface between the transparent film layer and the air, and the light that is transmitted (or transmitted and scattered and reflected at the same time) at the direct contact between the transparent film layer and the object is used for fingerprint identification. Therefore, even if a plurality of fingerprint patterns contact the transparent film layer, they can be identified without being affected by each other.

In one example, the projected area S1 of the first light control unit may be smaller than the projected area S2 of the second light control unit. In the present application, the "projection area" may mean an area in which a corresponding configuration is visually recognized, for example, an orthogonal projection area when the fingerprint recognition film is observed from the top or bottom in a direction parallel to the normal direction of the surface. Accordingly, an increase or decrease in the actual area due to irregularities or the like of the area comparison target configuration is not considered. Although not particularly limited, S1:S2 may range from 5 to 40:60 to 95.

In another example related to the present application, the present application relates to an optical fingerprint recognition device or a fingerprint input device.

In one example, the device may further include a light source unit. The light source means a configuration capable of irradiating light toward the above-described fingerprint recognition film. If the above function can be performed, the specific configuration of the light source unit is not particularly limited. The light source unit may be positioned on one surface of the low refractive index layer of the fingerprint recognition film, and more specifically, on a surface opposite to the low refractive index layer facing the first light control unit. Light incident from the light source unit is incident on the first light control unit of the diffractive optical element through the low refractive layer, and light that can always be totally reflected in the fingerprint recognition film may be provided to the fingerprint recognition film. In one example, the light incident on the first light control unit may be perpendicular to the lower surface of the first light control unit. In the present application, the term "vertical" refers to a practical vertical within a range that does not impair the desired effect, and is used in consideration of, for example, manufacturing errors or variations. In this case, errors or deviations are within ±10 degrees, within ±8 degrees, within ±6 degrees, within ±4 degrees, within ±2 degrees, within ±1 degrees, within ±0.5 degrees, within ±0.2 degrees, or ±0.1 May be within degrees.

In one example, the device may further include a sensor unit. The sensor unit may mean a configuration that detects light reaching the low refractive layer or passing through the low refractive layer. If the above function can be performed, the configuration of the sensor unit is not particularly limited, and a known sensor may be used. The sensor unit may be located on one surface of the low refractive index layer of the fingerprint recognition film, and more specifically, on a surface opposite to the low refractive index layer that is in contact with the second light control unit. As described above, except for the total reflection light at the interface of the low refractive layer, the light totally reflected in the portion of the transparent film layer in direct contact with the fingerprint may reach the low refractive layer or pass through the low refractive layer and be detected by the sensor unit. In addition, the sensor unit may recognize a pattern of an object in contact with the transparent film layer, that is, a fingerprint through this. In one example, the sensor unit may be transparent.

The present application also relates to a display panel comprising an optical fingerprint recognition device.

In one example, the panel may include the above-described fingerprint recognition film and a screen display unit. The screen display unit may be configured to allow a user to visually recognize an image or a video played on the device, for example. The screen display may be positioned on one surface of the low refractive index layer of the fingerprint recognition film, more specifically, on a surface opposite to the low refractive index layer that the second light control unit contacts.

In another example, the device may include a screen display unit and a sensor unit at the same time. In this case, the device may sequentially include a screen display unit, a sensor unit, and a fingerprint recognition film, or may sequentially include a sensor unit, a screen display unit, and a fingerprint recognition film. Also, any one of the screen display unit and the sensor unit may form a layer with the light source unit.

In another example, the device may further include one part that simultaneously performs a screen display function and a sensor function. In this case, the one part may form one layer with the light source unit.

In the present application, even when applied to a structure with a curvature such as a flexible structure or a bending structure, a defect such as a lifting phenomenon does not occur, and a phenomenon that may affect performance such as a change in the center diffraction wavelength of a diffraction optical element While being prevented, a fingerprint recognition film having excellent durability and fingerprint recognition function can be provided.

1 is a diagram illustrating a case in which a fingerprint recognition film is combined with a display device or a sensor to display a fingerprint recognition function according to an example of the present application.
2 is a diagram showing a fingerprint recognition result according to an embodiment.

Hereinafter, the present application will be described through examples, but the scope of the fingerprint recognition film of the present application is not limited to the following examples.

1. Evaluation of center diffraction wavelength change

The shifting of the center diffraction wavelength of the diffractive optical element (holographic film) made of the photopolymer was measured using a measurement equipment (IS-SA-13-1-220V) of Radiant Imaging. The diffraction efficiency of the optical element was evaluated using the measuring equipment to determine whether the change in the central diffraction wavelength designed for the diffractive optical element in the fingerprint recognition film prepared in Examples and Comparative Examples, respectively, was prepared immediately after the fingerprint recognition film was prepared. (Initial) and after maintaining the prepared film at 25° C. and 50% absolute humidity for 24 hours (later), the wavelength at the point where the diffraction efficiency is maximum is measured, respectively, and the change in the center diffraction wavelength in the early and late stages Was compared.

<Criteria for evaluation of center diffraction wavelength change>

Pass: The change in the center diffraction wavelength in the early and late period is less than 10 nm

NG: The change of the center diffraction wavelength in the early and late period is more than 10 nm

2. High temperature reliability evaluation

High temperature reliability After attaching soda-lime glass on the top of the first adhesive layer of the fingerprint recognition film, and attaching a metal foil on the side opposite to the side on which the first adhesive layer is formed, a temperature of 50℃ and 5 atm conditions After treatment in an autoclave of for 20 minutes, the temperature was maintained at a temperature of 60 and a relative humidity of 90% for about 240 hours to evaluate high-temperature/high-humidity durability, and the laminate after the autoclave treatment was maintained at a temperature of 80 to about 240. High temperature durability was evaluated. At this time, the evaluation criteria are as follows.

<Evaluation criteria>

Pass: No air bubbles or lifting occurs during high temperature/high humidity durability evaluation and high temperature durability evaluation

NG: Bubbles and/or lifting occurs during high-temperature/high-humidity durability evaluation and/or high-temperature durability evaluation

3. Evaluation of banding characteristics

After bending the edge portion of the fingerprint recognition film prepared in Examples or Comparative Examples, it was evaluated by observing whether or not lifting occurs in the bending portion, and evaluated according to the following criteria.

<Evaluation criteria>

Pass: No lifting occurs in the banding area

NG: Lifting occurs in the banding area

4. Evaluation of fingerprint recognition function

The fingerprint recognition function of the fingerprint recognition film is performed by passing a low refractive index layer (a silicon adhesive layer attached to the lower portion) to the first light control unit of the diffractive optical element in a state where the fingerprint is in contact with the cover glass surface of the manufactured fingerprint recognition film. After the light was incident so that the light was incident in the normal direction of the recognition film, an image identified in the low refractive layer was confirmed by a charge-coupled device (CCD) and evaluated. As shown in the result of FIG. 2 (result of Example 1), a case in which a fingerprint was recognized well was evaluated as Pass, and a case in which it was not evaluated as NG. The fingerprint recognition function is a result of measurement immediately after manufacture of the fingerprint recognition film.

Preparation Example 1. Preparation of diffractive optical element

The first light control unit and the second light control unit are formed by recording diffraction patterns on a photopolymer film (Cobest, Bayfol HX) having a thickness of about 30㎛ and a length of about 4 cm each. A holographic film was prepared. In the recording of the diffraction pattern, a laser beam having a wavelength of about 532 nm is irradiated with an intensity of 700 ㎼ for about 250 seconds, while at the same time, the interference light of 700 ㎼ emitted from the same laser is irradiated with a beam splitter. It was carried out by irradiation on the photopolymer film. The first light control unit is formed to emit incident light in the normal direction of the surface of the diffractive optical element toward the second light control unit by inclining it by 73 degrees based on the normal, and the second light control unit receives some of the incident light from the first light control unit. It is configured so that it can be emitted at an angle of about 45 degrees based on the normal line. The diffractive optical element was manufactured by attaching the holographic film to a polyamide (PA) film having a thickness of about 60 μm.

Example 1

A silicon pressure-sensitive adhesive layer (thickness: 25 μm, Shin-etsu Corp., KR-3700) having a refractive index of about 1.41 was attached to the upper and lower portions of the diffractive optical element prepared in Preparation Example 1. Then, a transparent film (PET (poly(ethylene terephthalate)) film, thickness: 23㎛, refractive index: about 1.575, type: Mitsubishi's T604E23) was attached to the top of the silicone pressure-sensitive adhesive layer attached to the top, and the refractive index again A fingerprint recognition film was prepared by attaching an acrylic adhesive layer (thickness: 150 μm, manufactured by LG Chem, OC1152A) of about 1.47, and attaching a well-known decor film and cover glass to the top of the acrylic adhesive layer. 2 is a result of evaluating the fingerprint recognition function of the fingerprint recognition film prepared as described above.

Comparative Example 1

Compared with Example 1, a fingerprint recognition film was prepared without attaching a transparent film and an acrylic adhesive to the silicone adhesive layer on the upper portion of the diffractive optical element, and the thickness of the upper silicone adhesive layer to about 25 μm.

Comparative Example 2

Compared with Comparative Example 1, a semi-cured type pressure-sensitive adhesive (refractive index: 1.42, thickness: 150 μm, fluorine-based monomer (Daikin, C6SFA added product)) was attached instead of the silicone pressure-sensitive adhesive layer on the top of the diffractive optical element to form a fingerprint recognition film. Was prepared.

Comparative Example 3

Compared with the structure of Example 1, without forming a silicone adhesive and a transparent film on the top of the diffractive optical element, a coating layer (BPO type silicone primer) having a refractive index of about 1.41 between the diffractive optical element and the acrylic adhesive layer was formed. Formed to a thickness of 3㎛ to prepare a fingerprint recognition film.

Comparative Example 4

Compared with the structure of Example 1, a fingerprint recognition film was prepared by forming an acrylic pressure-sensitive adhesive layer without forming a transparent film on top of the silicone pressure-sensitive adhesive on top of the diffractive optical element.

The evaluation results for the fingerprint recognition films of the Examples and Comparative Examples are compared and shown in Table 1 below.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Diffraction center wavelength change Pass Pass NG NG NG High temperature reliability Pass Pass Pass NG Pass Banding characteristics Pass NG NG NG Pass Fingerprint recognition function Pass Pass Pass Pass Pass

Initially, as described in Table 1, both of the fingerprint recognition films of Examples and Comparative Examples showed appropriate fingerprint recognition functions. However, in the case of Comparative Example 1, when applied to the banding structure, it was expected that the fingerprint recognition function would be damaged due to the occurrence of a lifting phenomenon, and in Comparative Examples 2 and 4, shifting of the center diffraction wavelength was observed, In the case of Comparative Example 3, as the central diffraction wavelength was shifted, high temperature reliability and banding characteristics were also poor.

Claims (17)

A first pressure-sensitive adhesive layer having a refractive index greater than 1.42; Transparent film layer; A second pressure-sensitive adhesive layer having a refractive index of 1.42 or less; And a diffractive optical element in the above order,
The diffraction optical element further includes a low refractive index layer present in a surface direction opposite to the surface facing the second pressure-sensitive adhesive layer and having a refractive index in the range of 1.35 to 1.42,
The first and second light control units are formed in the diffractive optical element,
The first light control unit transmits light incident to the first light control unit at a first angle (θ ₀ ) through the low refractive layer at the interface between the second adhesive layer and the diffractive optical element, and the interface between the low refractive layer and the diffractive optical element. It is a holographic photopolymer area designed to emit light of a second angle (θ _A ) that is totally reflected to the second light control unit,
The second light controller, wherein the second angle (θ _A) different from the third angle of the light incident to the second light control portion and the light with the second angle and the second angle (θ _A) to (θ _B) Fingerprint recognition film, a holographic photopolymer film designed to be divided into light of light. The fingerprint recognition film according to claim 1, wherein the first pressure-sensitive adhesive layer has a refractive index in the range of 1.45 to 1.50. The fingerprint recognition film of claim 1, wherein the first pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer. The fingerprint recognition film according to claim 1, wherein the transparent film layer has a refractive index in the range of 1.41 to 1.60. The fingerprint recognition film according to claim 1, wherein the transparent film layer is a polyester film, a fluoropolymer film, a polyolefin film, a polyvinyl chloride film, a polyurethane film, a polycarbonate film, a polyamide film, or a polyimide film. The fingerprint recognition film according to claim 1, wherein the second pressure-sensitive adhesive layer has a refractive index in the range of 1.35 to 1.42. The fingerprint recognition film according to claim 1, wherein the second pressure-sensitive adhesive layer is a silicone-based pressure-sensitive adhesive layer. The fingerprint recognition film according to claim 1, wherein the diffractive optical element is a holographic photopolymer film. delete delete The fingerprint recognition film of claim 1, wherein the light of the second angle θ _A satisfies the following relations 1 and 2:
[Relationship 1]
θ _A > (180 degrees/π) × sin ^-1 (n ₂ /n ₃ )
[Relationship 2]
θ _A > (180 degrees/π) × sin ^-1 (n ₄ /n ₃ )
In the relations 1 and 2, n ₂ is the refractive index of the second pressure-sensitive adhesive layer, n ₃ is the refractive index of the first light control unit or the second light control unit of the diffractive optical element, n ₄ is the refractive index of the low refractive layer, and n ₃ is is greater than n ₂ and n ₄ respectively. The fingerprint recognition film according to claim 1, wherein the light of the third angle θ _B passes through the second pressure-sensitive adhesive layer while satisfying the following relational equation 3:
[Relationship 3]
θ _B <(180 degrees/π) × sin ^-1 (n ₂ /n ₃ )
In the relational expression 3, n ₂ is the refractive index of the second pressure-sensitive adhesive layer, n ₃ is the refractive index of the first light control unit or the second light control unit of the diffractive optical element, and n ₃ is greater than n ₂ . The method of claim 1, further comprising a transparent film layer formed in a direction opposite to the surface of the first adhesive layer facing the transparent film,
The a 3 angle (θ _B) with a second pressure-sensitive adhesive layer of the light that the second pressure-sensitive adhesive layer to said third angle (θ _B), which is different from the fourth angle (θ _{B ')} while the transmission passes through the incident on the transparent film layer, and,
The light of the fourth angle (θ _B' ) satisfies the following relational expression 4 and is totally reflected on the surface of the transparent film layer in contact with the air, and the light of the fourth angle (θ _B' ) satisfies the following relational expression 5 A fingerprint recognition film provided so that an object having a different pattern and a transparent film layer can be transmitted from the upper surface of the transparent film layer in direct contact:
[Relationship 4]
θ _B' > (180 degrees/π) × sin ^-1 (n ₀ /n ₁ )
[Relationship 5]
θ _B' <(180 degrees/π) × sin ^-1 (n _h / n ₁ )
In the relations 4 and 5, n ₀ is the refractive index of air and is 1, n ₁ is the refractive index of the transparent film layer, and n _h is a pattern having a different height when an object having a pattern having a different height contacts the transparent film layer. It is the refractive index of the portion of the object having a direct contact with the transparent film layer. The fingerprint of claim 13, wherein the light of the fourth angle (θ _{B '} ) totally reflected from the upper surface of the transparent film layer in contact with air satisfies the following relational equation 6, and is designed to pass through the second pressure-sensitive adhesive layer. Recognition film:
[Relationship 6]
θ _{B '} <(180 degrees/π) × sin ^-1 (n ₂ /n ₁ )
In the relational expression 6, n ₁ is the refractive index of the transparent film layer, n ₂ is the refractive index of the second pressure-sensitive adhesive layer, and n ₁ is greater than n ₂ . The low-refractive-index layer of claim 13, wherein the light of the fourth angle (θ _{B '} ) totally reflected from the upper surface of the transparent film layer in contact with air satisfies the following relational expression 7 and passes through the second pressure-sensitive adhesive layer and the diffractive optical element. Fingerprint identification film designed to reach:
[Relationship 7]
θ _{B '} <(180 degrees/π) × sin ^-1 (n ₄ /n ₁ )
In the relational formula 7, n ₁ is the refractive index of the transparent film layer, and n ₄ is the refractive index of the low refractive index layer. An optical fingerprint recognition device comprising the fingerprint recognition film according to any one of claims 1 to 8 and 11 to 15. A display device comprising the fingerprint recognition film according to any one of claims 1 to 8 and 11 to 15.

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