Method for manufacturing paper-textured film for electronic product and paper-textured film for electronic product

Abstract

The method for manufacturing a paper-textured film according to the present invention comprises: (a) an imprinting mold manufacturing step of manufacturing an imprinting mold having a protrusion-forming groove formed on the surface thereof, the groove having a shape corresponding to a protrusion; (b) an adhesive layer forming step of preparing a thin sheet-type substrate and applying an adhesive resin to one surface of the substrate to form an adhesive layer; (c) a resin applying step of applying a liquid curable resin to the other surface of the substrate, on which no adhesive layer is formed; (d) an imprinting step of imprinting the applied liquid curable resin by using the protrusion-forming groove of the imprinting mold; and (e) a first resin layer preparation step of curing the liquid resin to form a first resin layer having a plurality of protrusions formed on the surface thereof.

Description

Method for manufacturing paper-textured film for electronic products and paper-textured film for electronic products

[0001] The present invention relates to a method for manufacturing a paper texture film for electronic products and a paper texture film for electronic products, and more specifically, to a method for manufacturing a paper texture film for electronic products and a paper texture film for electronic products that improves optical problems and aesthetics and has an excellent writing feel.

[0002] Typically, electronic devices with displays, such as cell phones and monitors, use a stylus to input text or draw. However, the drawback of drawing on a display is that the smooth surface, like glass, makes it difficult to experience the same tactile sensation as writing on a paper notebook.

[0003] Recently, there are cases where a paper texture film is attached to a display in order to feel the same feeling of writing with a pencil on an actual paper notebook in an electronic device.

[0004] Conventional paper-textured films are manufactured using liquid coating methods, such as painting, printing, or roll coating. Liquid coatings containing fillers are used to manufacture these films, and the fine fillers impart a roughness to the surface, creating a writing experience similar to that of a paper notebook.

[0005] However, these conventional technologies have optical problems such as resolution degradation, sparkling phenomenon, and gloss loss, as well as aesthetic problems due to rough texture.

[0006] Specifically, when using a liquid coating method containing filler, the surface is curved over a wide range compared to the size of the filler, and a curved surface is formed over a wide range compared to the area occupied by the filler per unit area, so the path of light emitted from the display cell is somewhat bent, causing refraction and diffraction phenomena, thereby lowering the display visibility.

[0007] In addition, since the flat surface area is reduced and the curved surface area is increased, there is a problem of various color distortions, such as sparkling, occurring similar to a convex or concave lens, which makes the display cells appear larger or smaller than they actually are.

[0008] Additionally, to achieve the desired writing feel, a significant density of filler is required, resulting in fewer flat areas and more curved surfaces, which in turn results in an overall perceived low gloss.

[0009] Additionally, since multiple fillers are used, the feel to the hand may feel somewhat rough, resulting in an unsatisfactory aesthetic.

[0010] The present invention was created to solve the above-described problems, and more specifically, the technical object is to provide a method for manufacturing a paper texture film for electronic products that improves optical problems and aesthetics and provides an excellent writing feel, and a paper texture film for electronic products.

[0011] In order to achieve the above-described technical purpose, a method for manufacturing a paper texture film for an electronic product having a plurality of protrusions formed on the surface to provide a paper texture is provided by attaching the film to a display of an electronic product capable of receiving handwriting input using a stylus pen of the present invention.

[0012] (a) An imprinting mold manufacturing step for manufacturing an imprinting mold having a groove for forming a protrusion having a shape corresponding to a protrusion formed on the surface;

[0013] (b) a step of forming an adhesive layer by applying an adhesive resin to one side of a substrate in the form of a thin sheet and forming an adhesive layer;

[0014] (c) a resin application step of applying a liquid curable resin to the other side where the adhesive layer is not formed in the above description;

[0015] (d) an imprinting step of imprinting the applied liquid curable resin using the grooves for forming protrusions of the imprinting mold; and

[0016] (e) It may include a first resin layer preparation step of hardening the liquid resin to prepare a first resin layer having a plurality of protrusions formed on the surface.

[0017] In the above manufacturing method, (a) the step of manufacturing a mold for imprinting,

[0018] (a-11) A step of forming a plurality of protrusions on the surface of the first sheet by applying a photoresist to one side of the first sheet and exposing and developing the photoresist using a mask;

[0019] (a-12) A step of preparing a first mold forming resin layer that forms grooves for forming protrusions on the surface by applying a liquid curable resin to the surface of the first sheet to cover a number of protrusions, then covering the second sheet and curing the same;

[0020] (a-13) A step of separating the second sheet and the first mold forming resin layer from the first sheet to obtain a mold for imprinting may be included.

[0021] In the above step (a-11) of the above manufacturing method,

[0022] The above protrusion can be heated at a high temperature to cause the protrusion to be deformed into a hemispherical shape.

[0023] In the above manufacturing method,

[0024] (a) Mold manufacturing stage,

[0025] (a-21) A step of forming a plurality of grooves on the surface of one side of the third sheet using a punching tool;

[0026] (a-22) A step of preparing a second mold forming resin layer by applying a liquid curing resin to one side of the third sheet to fill the plurality of grooves, then placing the fourth sheet thereon and curing it to form a plurality of protrusions on the surface; and

[0027] (a-23) A step of applying a liquid curable resin to cover a number of protrusions on the surface of a second mold forming resin layer, then covering the fifth sheet and curing it to produce a third mold forming resin layer having grooves for forming protrusions formed on the surface;

[0028] (a-24) A step of separating the third mold forming resin layer and the fifth sheet from the second mold forming resin layer to obtain a mold for imprinting may be included.

[0029] In the above manufacturing method,

[0030] Between step (a) and step (b),

[0031] A primer layer forming step may further be included to form a primer layer on the surface of the substrate by applying a primer to the surface of the above-mentioned substrate.

[0032] In the above manufacturing method,

[0033] The above primer layer can be formed on at least one of the front or back surfaces of the substrate.

[0034] In the above manufacturing method,

[0035] After step (e) above,

[0036] (f) A protective film attachment step of attaching a protective film to one surface of the first resin layer to cover the above-mentioned plurality of protrusions may be further included.

[0037] In the above manufacturing method,

[0038] After step (e) above,

[0039] (g) A water-repellent coating layer forming step may further be included, in which a water-repellent coating layer is formed on one surface of the resin layer on which a plurality of protrusions are formed.

[0040] In the above manufacturing method,

[0041] After step (e) above,

[0042] (h) It may further include a cutting step of cutting the first resin layer and the substrate into a required size using a laser or blade cutting to obtain a paper-textured film.

[0043] The paper texture film of the present invention for achieving the above-described technical purpose is a paper texture film for electronic products having a number of protrusions formed on the surface to provide a paper texture by being attached to a display of an electronic product capable of receiving handwriting input using a stylus pen.

[0044] A substrate in the form of a thin sheet;

[0045] An adhesive layer provided on the back side of the above-mentioned device;

[0046] A protective film provided on the surface of the adhesive layer; and

[0047] It may include a first resin layer provided on the upper surface of the above-mentioned substrate and having a plurality of hemispherical protrusions formed independently of each other by an imprinting process.

[0048] In the above paper texture film,

[0049] The above protrusion may have a diameter of 2 μm to 12 μm and a height of 0.5 to 5 μm.

[0050] In the above paper texture film,

[0051] The above first resin layer is,

[0052] It consists of a flat portion without protrusions and a protrusion portion with protrusions formed.

[0053] The area ratio of the flat surface to the protrusion can be 70% to 98%: 2% to 30%.

[0054] In the above paper texture film,

[0055] The above multiple protrusions may be spaced apart from each other and arranged irregularly.

[0056] In the above paper texture film,

[0057] The above-described plurality of protrusions form a border that surrounds a central empty space while forming a row, and can intersect substantially perpendicularly with a stylus pen running on the border.

[0058] In the above paper texture film,

[0059] A water-repellent coating layer can be formed on the surface of the first resin layer.

[0060] In the above paper texture film,

[0061] A primer layer may be formed between the above-described substrate and the first resin layer.

[0062] The paper texture film of the present invention for achieving the above-described technical purpose can be manufactured by the above-described manufacturing method.

[0063] The present invention has the advantage of being able to obtain a paper-textured film for electronic products that not only solves optical problems and improves aesthetics but also provides an excellent writing feel by manufacturing protrusions using a mold-based imprinting method rather than a liquid coating method using fillers.

[0064] Figures 1 to 4 are examples of electronic products in which the paper texture film of the present invention is used.

[0065] FIG. 5 is a drawing showing an example of a paper texture film according to one embodiment of the present invention.

[0066] Fig. 6 is a drawing exemplarily showing a pattern of protrusions in a paper texture film of the present invention.

[0067] Figure 7 is a block diagram of a method for manufacturing a paper texture film according to one embodiment of the present invention.

[0068] Figure 8 is a drawing showing the manufacturing method of Figure 7.

[0069] Fig. 9 is a block diagram showing a first embodiment of manufacturing a mold for imprinting among the manufacturing methods of Fig. 7.

[0070] Fig. 10 is a drawing according to the first embodiment of Fig. 9.

[0071] Fig. 11 is a block diagram showing a second embodiment of manufacturing a mold for imprinting among the manufacturing methods of Fig. 7.

[0072] Fig. 12 is a drawing according to the second embodiment of Fig. 11.

[0073] Figures 13 and 14 are photographs showing the difference in resolution between a conventional paper texture film and a paper texture film of the present invention.

[0074] Figure 15 is an enlarged image of a paper texture film manufactured using a manufacturing method according to one embodiment of the present invention.

[0075] The embodiments of this disclosure are provided for the purpose of illustrating the technical concepts of this disclosure. The scope of rights under this disclosure is not limited to the embodiments presented below or the specific descriptions of these embodiments.

[0076] All technical and scientific terms used in this disclosure, unless otherwise defined, have the meanings commonly understood by those of ordinary skill in the art to which this disclosure pertains. All terms used in this disclosure have been selected for the purpose of more clearly explaining this disclosure and are not intended to limit the scope of rights under this disclosure.

[0077] Expressions such as “including,” “comprising,” and “having” used in this disclosure should be understood as open-ended terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included.

[0078] The singular forms described in this disclosure may include plural meanings unless otherwise stated, and the same applies to the singular forms described in the claims.

[0079] In this disclosure, when it is said that a component is 'connected' or 'coupled' to another component, it should be understood that said component can be directly connected or coupled to said other component, or can be connected or coupled via a new other component.

[0080] The directional term "upward" used in this disclosure refers to the direction in which a mold for manufacturing a paper film is positioned relative to a substrate, and the directional term "downward" refers to the direction opposite to upward. It should be understood that the directional term "upward / downward" used in this disclosure includes both upward and downward directions, but does not refer to a specific direction among the upward and downward directions.

[0081] Embodiments are described with reference to examples illustrated in the accompanying drawings. In the accompanying drawings, identical or corresponding components are assigned the same reference numerals. Furthermore, in the description of the embodiments below, redundant descriptions of identical or corresponding components may be omitted. However, omission of a description of a component does not imply that such component is not included in any embodiment.

[0082] The embodiments described below and examples illustrated in the attached drawings relate to a film that is placed on a display of an electronic device to impart a paper texture. The electronic device includes a display having RGD cells. The electronic device includes various terminals such as a mobile phone, a smart phone, a tablet PC, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), and a navigation system, and the display is equipped with a touch sensor.

[0083] Within these terminals, the touch sensor may be located on the display panel displaying the image, or on a specific area of ​​the terminal body. By interacting with the terminal by touching the touch sensor, the terminal can provide an intuitive user interface. For precise touch input, the user can use a stylus pen.

[0084] The paper texture film (100) according to the present invention can be attached to the display of an electronic device, and as illustrated in FIG. 1, can be attached to the display of a tablet (1000). In addition, the paper texture film (100) according to the present invention can be attached to the display of a mobile phone (1100), as illustrated in FIG. 2, and can also be attached to the display of a notebook (1200), as illustrated in FIG. 3. In addition, as illustrated in FIG. 4, it can be attached to a flat panel display (1300), and after attachment, it imparts a paper texture to the display.

[0085] Meanwhile, the paper texture film (100) of the present invention is not limited to FIGS. 1 to 4, and can be attached to a curved display, an infolding foldable display, an outfolding folding display, a bendable display, and a stretchable / rollable display. In this way, the paper texture film (100) of the present invention can be attached to various displays having built-in touch sensors.

[0086] The paper texture film (100) according to the present invention is configured to include a substrate (110), a primer layer (120), an adhesive layer (130), a protective film (140), a first resin layer (150), and a water-repellent coating layer (160), as illustrated in FIG. 5.

[0087] The above substrate (110) is formed in a thin sheet form and may be formed of a transparent PET material. The substrate (110) may have a thickness of 0.05 to 1.2 mm. Meanwhile, the material of the substrate (110) is not limited thereto, and various materials such as glass, PC, PMMA, and CPI may be used as long as they are in the form of a transparent film.

[0088] These materials (110) are selected in various ways considering display resolution, window thickness, display damage protection performance (impact resistance), attachment conditions, etc. The surface attachment type has a thin thickness, and the edge attachment type has a thick thickness.

[0089] The above primer layer (120) is formed on the upper and lower surfaces of the substrate (110), respectively, and is provided on the substrate (110) to strengthen the adhesive strength when the adhesive layer (130) and the first resin layer (150) are insufficient.

[0090] The primer layer (120) may be made of a urethane-based or acrylic-based material, and may utilize a slot die coating, gravure coating, offset printing, spray coating, dipping coating, or flow coating method.

[0091] This primer layer (120) is not an essential component and can be removed if the adhesive layer (130) or the first resin layer (150) has excellent adhesion. If necessary, the primer layer (120) can be replaced by roughening the surface of the substrate to increase adhesion.

[0092] Specifically, it's possible to improve surface adhesion properties solely through surface modification, replacing the primer. Examples include plasma treatment, flame treatment, and corona discharge treatment. Surface modification methods such as plasma treatment alter the molecular activity of the surface, preventing the formation of a separate material layer.

[0093] The above adhesive layer (130) is for attaching the paper-textured film (100) to the display and for imparting adhesiveness to the substrate (110). It is preferable that the adhesive layer (130) be easily removable when replacement is necessary. This adhesive layer (130) is arranged on the back side of the substrate (110). Specifically, it may be attached to the primer layer (120) arranged on the lower side of the substrate (110). However, this is not limited thereto, and the adhesive layer (130) may also be directly attached to the substrate (110).

[0094] The adhesive layer (130) may use a transparent adhesive of OCA (Optical Grade), but a general grade adhesive may also be used. Additionally, synthetic polymers such as silicone series, acrylic series, and urethane series may be used.

[0095] This adhesive layer (130) can utilize the same coating process as the wet coating method for forming the primer layer (120). Meanwhile, although the adhesive layer (130) is mostly necessary, the adhesive layer (130) can be removed when fixed by attaching it with a magnet.

[0096] The protective film (140) is attached to the lower surface of the adhesive layer (130) to maintain the adhesive strength of the adhesive layer (130) before being attached to the display. In addition, the protective film (140) may be attached to the surface of the first resin layer (150) to prevent damage to the surface of the first resin layer (150) during movement. Various materials may be used for the protective film (140) as long as it is a synthetic resin film in the form of a thin sheet.

[0097] The first resin layer (150) is provided on the upper surface of the substrate (110) and is formed with a plurality of hemispherical protrusions (151) that are independently spaced apart from each other through an imprinting process.

[0098] This first resin layer (150) may be formed of an ultraviolet-curable resin that is cured by ultraviolet rays. In the present invention, the ultraviolet-curable resin is an appropriate mixture of a prepolymer, oligomer, and / or monomer having a polymerizable unsaturated bond or an epoxy group in its molecule.

[0099] Examples of prepolymers and oligomers in the ultraviolet-curable resin composition include unsaturated polyesters such as condensates of unsaturated dicarboxylic acids and polyhydric alcohols; methacrylates such as polyester methacrylate, polyether methacrylate, polyol methacrylate, and melamine methacrylate; acrylates such as polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, polyol acrylate, and melamine acrylate; and cationic polymerization type epoxy compounds.

[0100] Additionally, the UV-curable resin may include an organic-inorganic hybrid resin that contains inorganic substances such as silicon, silica, or silicon oxide based on the above components or is mineralized during the curing process.

[0101] When curing an ultraviolet-curable resin composition with ultraviolet rays, ultraviolet rays originating from light sources such as LEDs, ultraviolet lamps, high-pressure mercury lamps, low-pressure mercury lamps, carbon arcs, xenon arcs, or metal halide lamps can be used. It is preferable to add a photopolymerization initiator to the ultraviolet-curable resin composition. Examples of the photopolymerization initiator include acetophenones, benzophenones, mihrabenzoyl benzoate, o-benzoyl methyl benzoate, aldo oximes, tetramethylmethuram monosarphide, thioxanthone, and / or photosensitizers such as n-butyl amine, triethylamine, and tributylphosphine.

[0102] The protrusions (151) formed on the first resin layer (150) are configured so that a plurality of them are formed independently on the surface. That is, the protrusions (151) are configured so that they are spaced apart from each other without contacting each other.

[0103] It is preferable that these protrusions (151) have a diameter of 4 μm to 12 μm and a height of 0.5 to 5 μm. By reducing the size and height of the protrusions (151) in this way, it is possible to prevent the sparkling phenomenon from occurring as much as possible and to prevent excessive wear of the stylus pen tip.

[0104] The above first resin layer (150) is composed of a flat portion where no protrusions (151) are formed and a protrusion portion where protrusions (151) are formed, and it is preferable that the area ratio of the flat portion and the protrusion portion be 70 to 98%: 2 to 30%. By minimizing the area ratio of the protrusion portion where protrusions (151) are formed, it is possible to minimize a decrease in resolution and also to minimize a decrease in gloss.

[0105] In addition, it is preferable that the plurality of protrusions (151) spaced apart from each other are arranged irregularly. At this time, it is preferable that the plurality of protrusions (151) form a border that surrounds the central empty space while forming a row, and that they can substantially vertically intersect with the stylus pen running on the border.

[0106] Fig. 6 shows an example of an arrangement of protrusions (151). In the present invention, the protrusions (151) are configured in the form of dots arranged at relatively similar intervals along irregularly positioned curved or straight paths, thereby simultaneously implementing an arrangement parallel to and perpendicular to the direction of travel of the stylus tip. The straight path can have line segments arranged in various directions, and the curved path can have various forms, such as a simple curve with a single curvature, a spline with variable curvature, a compound curve in which multiple simple curves are connected, a compound curve composed of multiple simple curves and splines, and a group composed of irregular groupings without a linear path.

[0107] In the present invention, the protrusions (151) can be arranged at equal or irregular intervals along a randomly arranged curved or straight path, and grouped or grouped into irregular groups of 2 to 15. In addition, when the space between the grouped protrusions (151) is wide, one or two more protrusions can be arranged.

[0108] The above water-repellent coating layer (160) is formed on the surface of the first resin layer (150) to provide water-repellent performance.

[0109] The water-repellent coating layer (160) can be formed by selecting between dry coating and wet coating. Dry coating mainly uses electron beam (e-beam) deposition, but there are also thermal deposition and sputtering deposition. Such dry coating can first selectively coat a layer of SiO2 or various materials that are easy to secure adhesion to the product surface to improve adhesion, and then continuously form a water-repellent layer (hydrophobic or oleophobic) with a low surface energy material such as a fluorine-based or silicone-based material.

[0110] In addition, it is possible to form a water-repellent coating layer using the same method as primer coating with wet coating. In addition, to improve the durability and adhesion of the water-repellent coating layer (160), a primer coating may be added and then the water-repellent coating may be performed.

[0111] The method for manufacturing the paper texture film (100) according to the present invention is as follows.

[0112] First, an imprinting mold (200) is manufactured by manufacturing an imprinting mold (200) in which a groove for forming a protrusion having a shape corresponding to a protrusion (151) is formed on the surface. (Fig. 8(a), S100) First, the method disclosed in Figs. 9 and 10 will be described as follows.

[0113] A photoresist (211) is applied to one surface of a first sheet (210), and a photoresist (213) is formed on the surface of the first sheet (210) by exposing and developing using a mask (212). (S110) Specifically, a first sheet (210) in the form of a thin sheet is prepared (Fig. 10(a)), and a photoresist (211) is applied to the surface of the first sheet (210) (Fig. 10(b)). Afterwards, a mask (212) having through holes formed in each portion where a protrusion (151) is to be formed is placed on the first sheet (210), and then exposure is performed by irradiating ultraviolet rays. (Fig. 10(c)) Afterwards, a development process is performed to remove portions other than the portions irradiated with ultraviolet rays, so that a plurality of protrusions (213) are formed on the surface of the first sheet (210). (Fig. 10(d))

[0114] After forming the protrusion (213) on the first sheet (210) in this way, the protrusion (213) is heated to a high temperature to melt it, and thus the protrusion (213) is deformed into a hemispherical shape (droplet shape) by surface tension. (Fig. 10(e))

[0115] Afterwards, a liquid curable resin is applied to the surface of the first sheet (210) to cover a number of protrusions (213), and then a second sheet (220) is covered and cured to form a first mold forming resin layer for forming grooves for protrusions on the surface. (S120)

[0116] Specifically, a liquid curable resin (221') is applied on the first sheet (210) on which a plurality of protrusions (213) are formed to cover each protrusion (213). (Fig. 10(f)) The liquid curable resin (221') uses an ultraviolet curable resin that is cured by ultraviolet rays.

[0117] After applying the curing resin in this way, a second sheet (220) is placed on top and ultraviolet rays are applied to the liquid curing resin (221') to cure the curing resin. (Fig. 10(g)) A concave protrusion-forming groove (221a) corresponding to the protrusion (213) is formed on the lower surface of the first mold forming resin layer (221) cured by ultraviolet rays.

[0118] Afterwards, the second sheet (220) and the first mold forming resin layer (221) are separated from the first sheet (210) to obtain an imprinting mold (200). (S130) Specifically, the second sheet (220) and the cured first mold forming resin layer (221) are separated from the first sheet (210), thereby obtaining an imprinting mold (200). (Fig. (10(h)) Meanwhile, by repeating this operation to obtain a plurality of imprinting molds (200), these can be connected to each other to produce an imprinting mold (200) of a desired size. (Fig. 10(i))

[0119] Meanwhile, the mold (200) for imprinting is not limited to this and can be manufactured as disclosed in FIGS. 11 and 12.

[0120] First, a number of grooves are formed on the surface of one side of the third sheet (230) using a punching tool (300). (S110')

[0121] Specifically, after preparing the third sheet (230), a plurality of grooves (231) are formed on the surface of the third sheet (230) using a punching tool (300). (Fig. 12(a), Fig. 12(b)) At this time, the tip of the punching tool (300) has a hemispherical shape, so that hemispherical grooves can be formed on the surface of the third sheet (230).

[0122] Afterwards, a liquid curing resin is applied to one surface of the third sheet (230) to fill the plurality of grooves (231), and then a fourth sheet (231) is placed on the liquid curing resin and cured to form a second mold forming resin layer (232) having a plurality of protrusions (213) formed on the surface. (S120')

[0123] Specifically, a liquid curing resin (232') that is cured by ultraviolet rays is applied to the third sheet (230), and then ultraviolet rays are irradiated to cure the liquid curing resin (232'). (Fig. 12(c)) The cured liquid curing resin (232') is manufactured into a second mold forming resin layer (232) having a plurality of protrusions (232a) formed on the surface. (Fig. 12(d))

[0124] Afterwards, a liquid curable resin (234') is applied to cover a number of protrusions (232a) on the surface of the second mold forming resin layer (232), and then a fifth sheet (233) is covered and cured to produce an imprinting mold (200) having grooves (234a) for forming protrusions formed on the surface. (S130')

[0125] Specifically, in order to manufacture a mold (200) in which a plurality of grooves (234a) for forming projections are formed by imprinting a second mold forming resin layer (232), a liquid curing resin (234') that is cured by ultraviolet rays is applied to the surface of the second mold forming resin layer (232), and then the liquid curing resin (234') is cured while irradiating with ultraviolet rays. (FIG. 12(d)) After irradiating with ultraviolet rays in this manner, the liquid curing resin (234') is cured, and a third mold forming resin layer (234) in which grooves (234a) for forming projections are formed on the surface is obtained.

[0126] Afterwards, the third mold forming resin layer (234) and the fifth sheet (233) are separated from the second mold forming resin layer (232) to obtain an imprinting mold (200). (S140')

[0127] Specifically, the third mold forming resin layer (234) and the fifth sheet (233) can be separated from the second mold forming resin layer (232) to obtain an imprinting mold (200). (Fig. 12(f))

[0128] After manufacturing an imprinting mold (200) by the manufacturing method illustrated in FIG. 9, FIG. 10, or FIG. 11 to FIG. 12, a primer is applied to the surface of the substrate (110) to form a primer layer (120) on the surface of the substrate (S200).

[0129] The primer layer (120) is optionally used when the surface adhesion of the adhesive layer and resin layer applied in the process is insufficient, and is applied using a wet coating method. On the other hand, when the surface adhesion is good, the primer layer (120) may not be applied, and if necessary, it may be replaced with a surface modification method.

[0130] Afterwards, a thin sheet-shaped substrate (110) and an adhesive resin are applied to one side of the substrate (110) to form an adhesive layer (130). (S300)

[0131] The adhesive layer (130) may be a viscous gel-type coating layer that attaches a paper-textured film (100) to the display surface and can be easily removed when replacement is required. The adhesive layer (130) may use the wet coating method used to apply the primer layer (120).

[0132] Afterwards, a liquid curable resin is applied to the other side of the substrate (110) where the adhesive layer (130) is not formed. (S400)

[0133] Specifically, a liquid curable resin (150') that is cured by ultraviolet rays is applied to the upper surface of the substrate (110) where no adhesive layer is formed. At this time, an imprinting mold (200) as shown in Fig. 8(a) is placed on top of the liquid curable resin (150'). (Fig. 8(b)) When a primer layer is formed, the liquid curable resin (150') is applied on top of the primer layer (120) formed on the upper surface of the substrate (110), and when there is no primer layer (120), the liquid curable resin (150') is applied directly to the upper surface of the substrate (110).

[0134] Afterwards, the applied liquid curable resin (150') is imprinted using the groove (221a) for forming a protrusion of the imprinting mold (200). (S500)

[0135] Specifically, as illustrated in Fig. 8(c), an imprinting mold (200) having a plurality of grooves (221a) for forming protrusions formed on the bottom surface is lowered and pressurized with a liquid curable resin layer so that the liquid curable resin layer flows into the grooves (221a) for forming protrusions. Thereafter, ultraviolet rays are irradiated to harden the liquid curable resin (150').

[0136] Afterwards, the liquid resin (150') is hardened to form a first resin layer (150) having a number of protrusions (151) formed on the surface. (S600)

[0137] When the liquid resin hardens, a first resin layer (150) is formed on the surface with a number of protrusions (151). Once hardening is complete, the imprinting mold (200) is separated from the first resin layer (150). (Fig. 8(d))

[0138] Afterwards, a protective film (140) is attached to one surface of the first resin layer (150) to cover the above-mentioned plurality of protrusions (151). (S700)

[0139] Specifically, a protective film (140) is attached to cover the surface of the first resin layer (150) so that the plurality of protrusions (151) formed on the surface of the first resin layer (150) are not damaged during the moving process. (Fig. 8(e)) This protective film (140) can also be additionally attached to the surface of the adhesive layer.

[0140] Afterwards, a water-repellent coating layer (160) is formed. (S800) Specifically, the water-repellent coating layer (160) is formed so that a thin water-repellent coating layer (160) is formed on the surface of the first resin layer (150). The water-repellent coating layer (160) can be selectively applied using a dry coating method or a wet coating method. The water-repellent coating layer (160) imparts water-repellent performance to the first resin layer (150) using a material with low surface energy, such as a fluorine-based or silicone-based material.

[0141] It is also possible to form a primer layer (120) on the surface of the first resin layer (150) in advance before forming the water-repellent coating layer (160).

[0142] Afterwards, cut to the required size to obtain a paper texture film (100). (S900)

[0143] To obtain the paper-textured film (100) of the final required size, the film can be cut to the required size using laser cutting or blade cutting. Laser cutting is cutting into the product shape using cutting lasers of various sources and wavelengths, such as a CO2 laser. In addition, blade cutting can be applied by press cutting using a cutting mold such as a wooden die, a pinnacle mold, and a press machine, or a cutting plotter that moves a blade under CNC control and cuts a path.

[0144] When comparing the paper texture film (100) manufactured in this manner according to the present invention with the existing paper texture film (100), it can be confirmed that the character clarity is significantly improved as shown in FIG. 13.

[0145] Specifically, Fig. 13(a) shows a paper texture film using an existing filler, and Fig. 13(b) shows a paper texture film (100) manufactured according to the present invention.

[0146] The resolution is noticeably reduced by gloss, which becomes more noticeable the greater the height difference between the display RGB cells and the matte surface of the protective film (140). This is similar to the phenomenon where, when a matte film is placed in contact with printed paper, letters or pictures can be recognized, but the shape behind the matte surface becomes unrecognizable the further away it is positioned. In other words, the resolution reduction becomes more severe as the gloss decreases and the distance between the display cells and the matte surface increases. The distance between the display cells and the matte surface is determined by the display and window stacking structure and the protective film stacking structure, and it is desirable to increase the gloss as much as possible to minimize the resolution reduction.

[0147] The present invention maximizes gloss compared to existing technologies, thereby increasing resolution and, accordingly, providing excellent character clarity and allowing each pixel to be clearly recognized.

[0148] Fig. 14 compares the light distortion phenomenon caused by sparkling. Fig. 14(a) uses a paper texture film using an existing filler, and Fig. 14(b) uses a paper texture film (100) manufactured by a manufacturing method according to the present invention.

[0149] Sparkling is a localized lens effect caused by the shape of a surface. It is a phenomenon caused by the refraction and diffraction of light, and is distinct from gloss and resolution degradation. Sparkling appears as tiny, sparkling dots, each of which is essentially a magnification or reduction of RGB cells. Strictly speaking, the individual sparkling dots appear to be a variety of colors. Influencers like YouTubers sometimes refer to it as the "rainbow effect."

[0150] It is said that the existence of a dot-shaped image recognized in a general usage environment (at a distance of 15 cm or more from the eyes) can be recognized and the shape, color, etc. can be judged when the size is 50 μm or larger. In the present invention, the sparkling phenomenon is dramatically suppressed by limiting the distortion of light due to refraction and diffraction to a size within 50 μm. The shape of the protrusion (151) for implementing the feeling of writing (vibration and friction sound feedback due to friction) is applied in the shape of a dot with a diameter of 12 μm or less and a height of 5 μm or less, thereby inducing the distortion of light due to refraction and diffraction to be recognized to a size within 50 μm, thereby minimizing the apparent sparkling phenomenon.

[0151] It can be seen that the present invention minimizes light distortion by minimizing the sparkling phenomenon compared to existing technologies.

[0152] Fig. 15 is an actual photograph of a paper-textured film (100) manufactured according to the present invention. As can be seen in Fig. 15, unlike a paper-textured film (100) utilizing filler, the liquid coating layer is not curved over a wide range around the hemispherical protrusions (151), and the hemispherical protrusions (151) are clearly and independently distinguished from the surrounding hemispherical protrusions (151).

[0153] That is, except for the part where the hemispherical protrusions (151) are formed, the entire film is formed in a flat shape, so there are almost no problems such as unnecessary resolution reduction, sparkling, or gloss reduction, and it has superior characteristics than the existing paper-textured film (100) containing filler, such as not feeling rough to the touch.

[0154] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and variations of the embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A method for manufacturing a paper texture film for electronic products having a plurality of protrusions formed on the surface to impart a paper texture to the display of an electronic product capable of receiving handwriting input using a stylus pen, (a) An imprinting mold manufacturing step for manufacturing an imprinting mold having a groove for forming a protrusion having a shape corresponding to a protrusion formed on the surface; (b) a step of forming an adhesive layer by applying an adhesive resin to one side of a substrate in the form of a thin sheet and forming an adhesive layer; (c) a resin application step of applying a liquid curable resin to the other side where the adhesive layer is not formed in the above description; (d) an imprinting step of imprinting the applied liquid curable resin using the grooves for forming protrusions of the imprinting mold; and (e) A method for manufacturing a paper-textured film for electronic products, characterized by including a first resin layer preparation step of preparing a first resin layer having a plurality of protrusions formed on the surface by curing the liquid resin.

2. In paragraph 1, (a) The mold manufacturing step for imprinting is: (a-11) A step of forming a plurality of protrusions on the surface of the first sheet by applying a photoresist to one side of the first sheet and exposing and developing the photoresist using a mask; (a-12) A step of preparing a first mold forming resin layer that forms grooves for forming protrusions on the surface by applying a liquid curable resin to the surface of the first sheet to cover a number of protrusions, then covering the second sheet and curing the same; (a-13) A method for manufacturing a paper-textured film for electronic products, characterized by comprising a step of separating a second sheet and a first mold-forming resin layer from a first sheet to obtain a mold for imprinting.

3. In paragraph 2, In the above step (a-11), A method for manufacturing a paper-textured film for electronic products, characterized in that the protrusion is heated at a high temperature so that the protrusion is deformed into a hemispherical shape.

4. In paragraph 1, (a) Mold manufacturing stage, (a-21) A step of forming a plurality of grooves on the surface of one side of the third sheet using a punching tool; (a-22) A step of preparing a second mold forming resin layer by applying a liquid curing resin to one side of the third sheet to fill the plurality of grooves, then placing the fourth sheet thereon and curing it to form a plurality of protrusions on the surface; and (a-23) A step of applying a liquid curable resin to cover a number of protrusions on the surface of a second mold forming resin layer, then covering the fifth sheet and curing it to produce a third mold forming resin layer having grooves for forming protrusions formed on the surface; (a-24) A method for manufacturing a paper-textured film for electronic products, characterized by comprising a step of obtaining a mold for imprinting by separating a third mold-forming resin layer and a fifth sheet from a second mold-forming resin layer.

5. In paragraph 1, Between step (a) and step (b), A method for manufacturing a paper-textured film for electronic products, characterized in that it further includes a primer layer forming step of applying a primer to the surface of the above-mentioned substrate to form a primer layer on the surface of the substrate.

6. In paragraph 5, A method for manufacturing a paper-textured film for electronic products, characterized in that the primer layer is formed on at least one of the front and back surfaces of the substrate.

7. In paragraph 1, After step (e) above, (f) A method for manufacturing a paper texture film for electronic products, characterized in that it further includes a protective film attachment step of attaching a protective film to one surface of the first resin layer to cover the plurality of protrusions.

8. In paragraph 1, After step (e) above, (g) A method for manufacturing a paper-textured film for electronic products, characterized in that it further includes a step of forming a water-repellent coating layer on one surface of a resin layer on which a plurality of protrusions are formed.

9. In paragraph 1, After step (e) above, (h) A method for manufacturing a paper-textured film for electronic products, characterized in that it further includes a cutting step of cutting the first resin layer and the substrate to a required size using a laser or blade cutting to obtain a paper-textured film.

10. In a paper texture film for electronic products, which is attached to the display of an electronic product capable of stylus pen handwriting input and has a number of protrusions formed on the surface to provide a paper texture, A substrate in the form of a thin sheet; An adhesive layer provided on the back side of the above-mentioned device; A protective film provided on the surface of the adhesive layer; and A paper-textured film for electronic products, characterized by comprising a first resin layer provided on the upper surface of the above-mentioned substrate and having a plurality of hemispherical protrusions formed thereon independently spaced apart from each other by an imprinting process.

11. In paragraph 10, A paper-textured film for electronic products, characterized in that the above protrusions have a diameter of 4 ㎛ to 12 ㎛ and a height of 0.5 to 5 ㎛.

12. In paragraph 11, The above first resin layer is, It consists of a flat portion without protrusions and a protrusion portion with protrusions formed. A paper-textured film for electronic products, characterized in that the area ratio of the flat surface to the protruding surface is 70% to 98%: 2% to 30%.

13. In paragraph 10, A paper-textured film for electronic products, characterized in that the above-mentioned plurality of protrusions are spaced apart from each other and arranged irregularly.

14. In paragraph 13, A paper-textured film for electronic products, characterized in that the above-mentioned plurality of protrusions form a border that surrounds a central empty space while forming a row, and can substantially vertically intersect with a stylus pen running on the border.

15. In paragraph 10, A paper-textured film for electronic products, characterized in that a water-repellent coating layer is formed on the surface of the first resin layer.

16. In paragraph 10, A paper-textured film for electronic products, characterized in that a primer layer is formed between the above-mentioned substrate and the first resin layer.

17. Paper texture film for electronic products manufactured by the manufacturing method of paragraph 1.

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