KR20180073420A - Curved mobile device for attaching protecting sheet - Google Patents

Abstract

Provided is a portable device having a curved surface which is easy to discharge bubbles, overcomes a spring back phenomenon, and stably attaches a protection sheet regardless of a shape of a curved surface. The device comprising a window and a display is as follows: an entire or some part of the window contains a curved surface; a surface of the window facing the display has micro-protrusions for granting illuminations to the surface by a curve to make the window semi-transparent; and an adhesive layer of the protection sheet protecting the window is inserted into a space between the micro-protrusions, such that the semi-transparent window is switched to a transparent window.

Description

[0001] The present invention relates to a curved mobile device for attaching a protective sheet,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a curved surface portable device, and more particularly to a portable device for attaching a protective sheet to a portable device having a curved edge or the like.

A display such as a liquid crystal display (LCD), an organic light emitting diode (OLED), and electrophoresis (EPD) forms a screen. Display is widely used in mobile devices such as mobile phones, smart phones, tablets, and information processors such as ATMs and kiosks. The display device employs a portable device with various functions. Such a mobile device is, for example, a mobile phone, a smart phone, a tablet PC, a flexible display, and the like, and its components include a window, a circuit board, and a touch screen. At this time, the protective sheet is attached to the window of the portable device and serves to protect the window.

A portable device having a curved surface having a curvature and a three-dimensional curvature at an edge than a center portion has recently been applied. Furthermore, the curved portable device may include a corner that is connected to an edge to form a curved surface. As described above, the curved surface portable device has a tendency to have edges, corners or edges and curved surfaces. The protective sheet for protecting the curved surface portable device is not stably attached to the curved surface portable device due to elastic restoring force and deformation. In the future, it is expected that a flexible portable device with a more severe degree of curvature will appear in the future, and it is necessary to find a method of stably attaching the protective sheet.

Korean Patent Laid-Open Publication No. 2014-0013155 adopts a method in which flat tempered glass is used and the edge is attached to the front surface of the protective cover. The above method can not be adopted for the curved reinforced glass. In addition, since the multi-layer protective cover needs to be attached to the front surface of the edge, the manufacturing process is complicated. Further, the protective cover exposed to the outside is left with an adhesive material, foreign substances outside the portion are buried, and the aesthetic appearance is damaged. In addition, when the size of the edge forming the curved surface increases, the portion occupying the curved surface of the protective sheet expands, and the gap with the edge increases excessively. Accordingly, the method according to the patent is difficult to appropriately cope with the shape of the edge.

On the other hand, the curved surface is changed into various shapes such as a change in curvature and an aspherical surface. In order to cope with this, a method of molding a hard material excellent in hardness, stiffness, transparency, and workability such as tempered glass, polycarbonate, and polyester has been proposed. However, the protective sheet made of such a material is difficult to be molded, and there is a spring back phenomenon in which the protective sheet is intended to be restored to its original state even if it is molded. It is difficult to cope with the curvature and shape of the curved surface, so that it only covers a part of the curved surface. As another method, a soft material such as a soft TPU (Thermal Polyurethane) has been proposed, but the soft material has a remarkably low hardness and is very vulnerable to scratches. Further, the soft material must have high adhesion and it is not easy to remove bubbles.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a curved surface portable device for stably attaching a protective sheet irrespective of the shape of a curved surface while easily discharging bubbles and overcoming a springback phenomenon.

A curved surface portable device for attaching a protective sheet for attaching a protective sheet for solving the problems of the present invention is a portable device including a window and a display, wherein all or part of the window includes a curved surface, The micro concavity and convexity that makes the window translucent is placed by giving a roughness to the surface by bending. At this time, the semitransparent window penetrates the adhesive layer of the protective sheet attached to the window into the space between the fine irregularities, and the semitransparent window is converted into a transparent window.

In the device of the present invention, a touch screen may be present between the window and the display. The window may be any one selected from a glass substrate or a plastic substrate or a substrate on which they are laminated.

In the preferred apparatus of the present invention, the fine irregularities may be implemented directly in the window or in a separate layer located on the window. The fine irregularities may be arranged in any one of a line shape, a lattice shape, an island shape, or a combination thereof. The micro concavity and convexity may be formed in any shape selected from a cylinder, a hemisphere, a polygonal pyramid, a polygonal pyramid, or a combination thereof. The fine irregularities may include any one of beads or beads and a binder.

In the preferred apparatus of the present invention, the window may be divided into a region A where the fine irregularities are not present and a fingerprint preventing layer, and a region B where the fine irregularities exist and the fingerprint preventing layer is absent. The window may be divided into a rim and a central portion, and the B region may be disposed on the rim, the center portion, or both sides. The fraction occupied by the B area may be set according to the shape and size of the portable device.

In the device of the present invention, the screen of the portable device may be extended to the edge of the portable device. The portable device may be any one of a smart phone, a tablet PC, and a flexible display.

According to the curved surface portable device for attaching the protective sheet of the present invention, by forming fine irregularities on a part or the whole of the portable device window, the bubbles can be easily discharged and the protective sheet can be easily removed Stable attachment is possible.

1 is an exploded sectional view showing a first curved portable device for attaching a protective sheet according to the present invention and a protective sheet attached thereto.
Fig. 2 is a cross-sectional view showing an example of the fine unevenness in Fig. 1. Fig.
Fig. 3 is a partial perspective view showing an example of the arrangement of the fine irregularities in Fig. 1. Fig.
4 is a cross-sectional view showing a second curved portable device for attaching a protective sheet according to the present invention and a protective sheet attached thereto.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention. Also, in the figures, the thicknesses of the films (layers, patterns) and regions may be exaggerated for clarity. Further, when it is mentioned that the film (layer, pattern) is in the "upper", "upper", "lower", "one side" of another film (layer, pattern) Or a different film (layer, pattern) may be interposed therebetween.

Embodiments of the present invention provide a portable device which can reliably adhere a protective sheet regardless of the shape of a curved surface while easily discharging bubbles and overcoming a springback phenomenon by forming fine irregularities on a part or the whole of a portable device window . To this end, a window formed with fine irregularities will be specifically described, and a process of attaching a protective sheet to the window will be described in detail. The portable device according to the present invention is a portable device including a curved surface, and refers to a device having a rim, a central portion, and a curved surface. Portable devices having both a rim and a curved surface in the center portion may have a flexible display. Here, for convenience of explanation, a display having a curved surface on the rim is taken as an example.

1 is an exploded sectional view showing a first curved portable device (CD1) for attaching a protective sheet according to an embodiment of the present invention and a protective sheet attached thereto. However, it should be understood that the present invention is not limited to the disassembled cross-sectional view in the strict sense, but may be omitted from the exploded cross-sectional view for convenience of explanation.

1, the protective sheet 10 is attached to a first curved surface portable device CD1 having a curved surface. The first curved surface portable device CD1 is applied to a curved touch screen panel whose edge (a) has a curvature larger than the central portion (b) and is three-dimensional. The first curved surface portable device CD1 may be, for example, a mobile phone, a smart phone, or a tablet PC. The rim a is formed on one side, both sides or the periphery of the first curved mobile device CD1. The frame a may all have the same curvature and partially have different curvatures. Although not shown, the first curved surface portable device CD1 may include a corner to which a rim a is connected and forms a curved surface. Accordingly, the curved surface of the present invention also includes a combination of the corners at the edge (a).

In the first curved surface portable device CD1, the curvatures of the rim and the center portions (a, b) may be different or the same. When the curvatures are different, the rim forms a curved surface, and the center of the rim is flat or has a relatively small curvature. That is, the central portion (b) includes a flat portion. When the curvatures are equal to each other, it can be employed in a flexible portable device. Here, for convenience of explanation, the case where the curvature of the frame a is larger than the central portion b is merely an example.

The portable device CD1 is divided into a screen area and a bezel area. The screen area may extend to the edge (a) beyond the central part (b). The bezel region may include a printing layer that is transparent or exhibits various functions. The print layer may be formed of any one or more of transparent, translucent, and / or color. The printing layer may be formed using inkjet printing or transfer using inkjet printing using silk printing or UV or thermal curing. The position of the print layer may vary depending on the shape, function, and the like of the display device to which the portable device of the present invention is applied. In this case, the size of the screen by the curved touch screen panel can be more flexibly controlled regardless of the print layer.

The protective sheet 10 comprises a pressure-sensitive adhesive layer 11, a transparent sheet 12 and a functional layer 13. The pressure-sensitive adhesive layer 11 is made of a transparent pressure-sensitive adhesive, and may be, for example, any one of acrylic resin, silicone resin, epoxy resin, urethane resin or composite resin thereof. The transparent sheet 12 can be used without limitation as long as it is made of a transparent material. For example, a glass substrate or a plastic substrate. Specifically, the glass substrate may be tempered glass, and the plastic substrate is made of a thermoplastic resin. Preferably, the plastic substrate is made of PET (PolyEthylene Terephthalate), PEN (PolyEthylene Naphthalate), PES (Polyether Sulfone) ), PC (PolyCarbonate), PMMA (PolyMethyl Methacrylate), PU (Polyurethane), TAC (Tri-Acrylic-Cellulose) or COC (Cycloolefin Copolymer). The transparent sheet 12 may be a laminated structure in which the reinforcing glass and the plastic substrate are formed in multiple layers.

Alternatively, the transparent sheet 12 may employ a slim tempered glass having a thickness of approximately 10 mu m to 150 mu m. The slim tempered glass has a breakage mechanism that causes cracks that do not involve debris. Since there are no scattered fragments and no sharp edges, there is no debris that injures or injures the user or is sucked into the human body. The slim tempered glass is more flexible when it is applied to a curved surface portable device because it is free to bend.

The functional layer 13 may impart characteristics such as fingerprint prevention, antireflection, blue light blocking, electromagnetic wave blocking, privacy, and antibacterial properties. For example, a fluorine-based coating liquid may be wet-coated, or may be dry-coated by vacuum deposition to form a fingerprint-preventing coating layer that provides a fingerprint-proofing function. The functional layer 11 may be a glass substrate that has been subjected to anti-fingerprinting or anti-fingerprinting and antimicrobial treatment, or a plastic substrate having anti-fingerprint or anti-fingerprinting and anti- As such, the coating can allow the protective sheet 10 to exhibit various functions.

If the transparent sheet is tempered glass, an adhesive layer and a light-scattering film may be added between the adhesive layer 11 and the transparent sheet 12. [ The adhesive layer is made of a transparent adhesive, and may be any one selected from, for example, a thermosetting resin that is an acrylic resin, a silicone resin, or a urethane resin or a pressure sensitive adhesive in which a crosslinking agent is mixed with an ultraviolet curing resin, a mixture thereof, or a copolymer thereof. The shatterproof film is made of a transparent polymer film, and may be made of, for example, polyethylene terephthalate (PEN), polyethylene naphthalate (PEN), polyether sulfone (PES), polyimide (PI), polyarylate polymethyl methacrylate), or COC (cycloolefin copolymer).

The window (W) can be used without restrictions as long as it is made of a transparent material. For example, a glass substrate or a plastic substrate. Specifically, the glass substrate may be tempered glass, and the plastic substrate may be made of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyimide (PI), polyarylate polymethyl methacrylate), or COC (cycloolefin copolymer). The window W may also be a laminated structure in which the reinforcing glass and the plastic substrate are formed in multiple layers. The lower surface of the glass substrate or the plastic substrate of the window W may be provided with characteristics such as shielding, reflection prevention, blue light shielding, electromagnetic wave shielding, and privacy. In addition, the window W may be provided with an opening for exposing a button, a camera, a speaker, and the like.

The fine unevenness 20 is formed on the surface of the window W opposed to the display, and is not flat and has a curvature to generically refer to imparting roughness to the surface. The curvature may be angled, curvilinear, or a combination thereof. For example, the fine irregularities 20 may be in the shape of a band having a constant width, or may be a cylinder, a hemisphere, a polygonal pyramid such as a triangular pyramid, a polygonal pyramid such as a pyramidal pyramid, and a combination of the above shapes. In other words, the fine irregularities 20 are possible in various forms within the scope of the present invention. The fine unevenness 20 will be described in detail with reference to FIGS. 2 and 3 as an example. The fine irregularities 20 have an irregular surface 21 corresponding to the shape.

The fine irregularities 20 are formed by various methods. For example, it can be formed by mixing semi-transparent beads such as silica with a UV or thermosetting resin and coating them on the adhered layer and curing them. Further, it can be formed by coating a UV or thermosetting resin or the like with a sheet or roll mold in which the shape for forming the fine unevenness 20 is formed, and curing it. A film or a sheet coated with UV or a thermosetting resin can be transferred to the adhered layer. Can be formed by molding into a mold having a shape conforming to the fine unevenness (20).

The fine irregularities 20 can be formed by coating a resin or the like after masking, forming fine irregularities 20 by exposure or etching, and removing the mask. Can be formed directly on the surface of the detachable layer using a laser beam. Can be formed by printing directly on the surface of the adhered layer using UV or thermosetting ink. The fine irregularities 20 can be formed on the surface by directly applying a physical impact to the surface of the surface layer. The fine unevenness 20 formed by the above method can be implemented directly on the window W and can be implemented as a separate layer. This is represented by a dotted line.

When the protective sheet 10 is attached to the window W formed with the fine irregularities 20 according to the embodiment of the present invention, the adhesive layer 11 of the protective sheet 10 pierces into the space between the fine irregularities 20 For example, the translucent screen changes transparently. In the figure, the transparent concave-convex interfacial surface 21a formed by peeling the adhesive layer 11 of the protective sheet 10 through the space between the concave-convex interface surfaces 21a is represented by a dotted line. Accordingly, even if the window W formed with the fine irregularities 20 is used, the display clarity in the transparent state can be maintained. Since the adhesive layer 11 penetrates into the space between the fine protrusions 20, the bonding force with the protective sheet 10 is improved as compared with the case where the fine protrusions 20 are not present. That is, the fine unevenness 20 has an anker effect in coupling with the protective sheet 10. Accordingly, the anchor effect can prevent the springback phenomenon.

The fine irregularities 20 exhibit various effects such as prevention of fingerprints, prevention of contamination and prevention of reflection. If fine irregularities (20) are present, the fingerprints or contaminants are discontinuously formed to prevent the formation of fingerprints and adhesion of contaminants. Specifically, fingerprints or contaminants may adhere to the protruding portions of the fine unevenness 20, but they do not adhere to the concave portions. Thus, the fine irregularities 20 have an effect of preventing fingerprints and preventing contamination. Accordingly, the window W including the fine irregularities 20 need not have a separate fingerprint prevention function.

On the other hand, the irregular interfacial boundary surface 21a induces a slight diffuse reflection as compared with the case where the fine irregularities 20 are not present. The diffuse reflection shields the external light from reflecting on the screen corresponding to the window (W). Reflections on the screen are the cause of glare. The fine unevenness 20 of the present invention can reduce the glare phenomenon. In addition, this diffuse reflection slightly diffuses the light going straight from the display, and particularly enhances the degree of concealment at the edge (a). Furthermore, since the concave and convex portions 20 have concave portions, the discharge of bubbles is easy. That is, the minute concave and convex portions 20 allow the protective sheet 10 to be stably attached to the window W.

2 is a cross-sectional view showing an example of the fine unevenness 20 existing in the window W of FIG.

2, various shapes of fine unevenness 20 are formed in the window W. Here are some examples. Here, the fine irregularities 20 are formed by forming the irregularities in the shape of any one of the quadrangle 21a, the triangle 21b, and the hemispherical 21c or by using the bead or the bead and the binder 21d For example. That is, the interface between the fine irregularities 20 may have an angle, a curvature, or a combination thereof. When the fine unevenness 20 is formed in the window W, the window W is translucent and the light transmittance is low. The window W including the fine concavities and convexities 20 whose transmittance is lowered is lowered in transmittance and is visually distinguished from the transparent window without the fine irregularities 20. [

3 is a partial perspective view showing an example of the arrangement of fine unevenness 20 existing in the window W of FIG.

3, the fine irregularities 20 can be arranged in a line shape (a, 21e), a lattice shape (b, 21f), an island shape (c, 21g) or the like. At this time, although the case where the fine concavities and convexities 20 are arranged has the quadrangle 21a as an example of the boundary, it can be formed into any one shape selected from among the triangle 21b and the circular 21c, (21d). That is, the boundary surface of the fine irregularities 20 has an angle, a curvature, or a combination thereof. In addition, the fine irregularities 20 may be regularly arranged at regular intervals, but they may be irregularly arranged without a constant interval.

4 is a cross-sectional view showing a second curved portable device (CD2) for attaching a protective sheet according to an embodiment of the present invention and a protective sheet attached thereto. It should be noted, however, that there is no representation of a disassembly section in the strict sense, and there may be elements that may not appear on the section for convenience of explanation. The second curved surface portable device CD2 is the same as the first curved surface portable device CD1 except that the fingerprint preventing layer 30 is added. Accordingly, a detailed description of the duplicate description will be omitted.

4, the window W of the second curved surface portable device CD2 has the fingerprint preventing layer 30, the area A without the fine irregularities 20 and the fingerprint preventing layer 30, and the fine irregularities 20 are formed B area. For example, the B region may be formed in a part or all of a portion having a large curvature like the first region (a), and more preferably in a portion of the first region (a). The size of the area B is set to such a degree that bubbles are sufficiently removed and adhesion of the protective sheet 10 is smooth. The size of the B area can be determined in consideration of the shape and size of the second curved portable device CD2.

The position of the B area may not necessarily be on the curved surface. Specifically, the region B may be located only at the edge a, only at the center b, or both, as shown in the drawing. Particularly, in the case of a flexible portable device, since the entire portable device can be formed into a curved surface, the B region can be arranged regardless of the rim a and the central portion b. The fraction occupied by the area B in the window W can be determined in consideration of the shape and size of the curved portable device CD2. The shape of the region B may be a closed circular shape, a polygonal shape, or the like when viewed in the window W, or may be in the form of a band, and these may be combined. In addition, the B region may have an angle, a curvature, or a combination thereof while having the above-described shape.

In the B region according to the embodiment of the present invention, the fine unevenness 20 can be formed after removing the fingerprint blocking layer 30 formed on the curved portable device CD2 originally present. The removal of the fingerprint preventing layer 30 is performed by plasma or corona treatment or a continuous treatment thereof to change the adhesive force on the surface from 0.1 gf / 25 mm to 500 gf / 25 mm. Here, the plasma treatment is preferably performed after the corona treatment. In the case of the plasma treatment, a plasma method such as an atmospheric plasma, a reduced pressure plasma, or a corona plasma is used. That is, in order to improve the adhesion in the region B, the organic fingerprinting layer 30 is chemically removed, the surface of the region B is cleaned, and the organic substances on the surface are also removed by chemical reaction and physical reaction while activating the surface.

Plasma treated B region changes the chemical bond in the region of several ㎛ from the surface by using high energy of ion or electron. Further, the thickness of the surface is reduced to increase the contact angle. The surface of the B region is chemically or physically activated to react well with other materials. Thus, the B-region subjected to plasma treatment is subjected to surface modification such as surface cleaning, surface roughness change, and polar functional group formation such as removal of minute foreign matter.

In the case of the corona treatment, when the fingerprint blocking layer 30 to be treated is peeled off using the corona discharge technique, the surface adhesion in the area B is improved. When the B region is treated with a corona, charged particles in the corona collide with the surface to oxidize the surface. Therefore, the surface energy is increased by a polar group generated by the surface oxidation, for example, C = O, C-O-H, COOH, -COO-, -CO-, etc., and the affinity with the conductive high molecular material is improved, Further, by the corona treatment, a cross-linking structure between the polymer molecules may be formed in addition to the above-mentioned chemical polarity group, thereby improving the adhesiveness. The corona surface treatment is usually carried out by placing a window W between both electrodes where corona discharge is to occur and supplying a constant electric power to both electrodes to cause a corona discharge.

Alternatively, the fingerprint preventing layer 30 may be formed in the area A and the fingerprint preventing layer 30 may not be formed in the area B using the masking. The formation of the patterned fingerprint blocking layer 30 by masking is well known and a detailed description thereof will be omitted. At this time, the area B where the fingerprint preventing layer 30 is not formed includes the fine irregularities 20 described above. The fine irregularities 20 can be formed at any time before and after the fingerprint protection layer 30 is formed by masking.

On the other hand, in the region A where the fingerprint protection layer 30 is present, the protection sheet 10 is not easily attached. In the region B, since the fingerprint protection layer 30 is not provided and the minute irregularities 20 are formed, the protective sheet 10 is easily attached. As a result, the protective sheet 10 attached to the area B does not cause a springback phenomenon. The bubble is easily removed when the protective sheet 10 is attached since the bubble is designed to exist in the rim a so as to include the end of the rim a so that the removal of the bubble easily occurs. This effect has been described in detail in the first curved surface portable device CD1.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. It is possible. For example, although the embodiments of the present invention have been described with reference to a window, the concept of the present invention can also be applied to a touch screen, a touch screen cover layer, and a display.

10; Protective sheet 20; Fine unevenness
21, 21a, 21b, 21c, 21d, 21e, 21f, 21g; Irregularity boundary surface
CD1, CD2; The first and second curved mobile devices
W; window
30; Anti-fingerprint layer

Claims (12)

A portable device comprising a window and a display,
Wherein all or part of the window includes a curved surface,
Wherein a surface of the window opposite to the display is provided with fine irregularities for imparting illuminance to the surface by bending to translucent the window,
Wherein the semitransparent window penetrates the adhesive layer of the protective sheet attached to the window into the space between the fine irregularities so that the semitransparent window is converted into a transparent window. The curved surface portable device as claimed in claim 1, wherein a touch screen is present between the window and the display. The curved-surface portable device for attaching a protective sheet according to claim 1, wherein the window is made of one selected from a glass substrate, a plastic substrate, or a substrate on which the windows are laminated. The curved surface portable device as claimed in claim 1, wherein the fine concavities and convexities are implemented as separate layers directly on the window or on the window. The curved surface portable device according to claim 1, wherein the fine irregularities are arranged in any one of a line shape, a lattice shape, an island shape, or a combination thereof. The curved surface portable device according to claim 1, wherein the fine unevenness comprises any one shape selected from a cylinder, a hemisphere, a polygonal pyramid, a polygonal prism, or a combination thereof. The curved-surface portable device according to claim 1, wherein the fine irregularities include any one of beads or beads and a binder. The method according to claim 1, wherein the window is divided into a region A where the fine irregularities are not present and an area where the fingerprint preventing layer is present, and a region B where the fine irregularities are present and the fingerprint preventing layer is absent. Mobile devices. The curved surface portable device as claimed in claim 8, wherein the window is divided into a rim and a central portion, and the B region is disposed on one of the rim, the center portion, and both sides. The curved surface portable device according to claim 8, wherein a fraction occupied by the B area is set according to a shape and a size of the portable device. The curved surface portable device according to claim 1, wherein the screen of the portable device is extended to the edge of the portable device. The curved surface portable device according to claim 1, wherein the portable device is one of a smart phone, a tablet PC, and a flexible display.

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