KR102261882B1 - Protective sheet for flexible display, manufacturing apparatus and method for the same - Google Patents

Abstract

The present invention relates to a flexible display protective sheet, a manufacturing apparatus thereof, and a manufacturing method thereof. More particularly, the present invention relates to a flexible display protective sheet which forms a UV curing coating layer on a substrate layer by an imprinting method, but locally differentiates the thickness of the coating layer to improve folded part characteristics, a manufacturing apparatus thereof, and a manufacturing method thereof.

Description

Flexible display protection sheet, manufacturing apparatus and manufacturing method therefor {PROTECTIVE SHEET FOR FLEXIBLE DISPLAY, MANUFACTURING APPARATUS AND METHOD FOR THE SAME}

The present invention relates to a flexible display protective sheet, a manufacturing apparatus therefor, and a manufacturing method therefor, and more particularly, to form a UV curing coating layer on a substrate layer by imprinting method, but to locally differentiate the thickness of the coating layer to obtain fold characteristics It relates to a flexible display protective sheet to improve, a manufacturing apparatus therefor, and a manufacturing method therefor.

In general, a display panel of a terminal device such as a smart phone is used by attaching a protective sheet (protective film) to prevent an impact or scratch on a display window on which a screen is displayed.

Tempered glass is usually applied to the surface of the display window, and recently, a synthetic resin material such as ultra-thin tempered glass (UTG) or PI film that can be folded for a foldable terminal device or display is used as a display window.

However, since the display window is subjected to external stimulation due to contact with or falling of a finger, fingernail, pen, or other object in a usage environment, most users attach a protective film to use the display window.

Conventionally, as a protective film, a synthetic resin of a transparent material such as polyethylene (PET) or polycarbonate (PC) has been used. Recently, a protective film using a thermoplastic polyurethane (TPU) elastic body has been developed and used.

Furthermore, as another type of protective film, a TPU film is laminated on top of the above-described PET or PP synthetic resin layer through a transparent adhesive layer to provide a protective film that provides respective advantages.

However, while the conventional protective film is suitable for use by attaching it to a general flat panel display window, when the display is attached to a folding type window, folding is difficult or wrinkles occur due to the folding resistance, and in severe cases, the protective film peels off. There were several problems that occurred.

Republic of Korea Patent Registration No. 10-0761426 Republic of Korea Patent No. 10-1572991 Republic of Korea Patent Publication No. 10-2014-0022321

The present invention is to solve the problems described above, a flexible display protective sheet that forms a UV-curing coating layer on a base layer by imprinting, and improves fold properties by locally differentiating the thickness of the coating layer, for An object of the present invention is to provide a manufacturing apparatus and a manufacturing method.

To this end, the flexible display protective sheet according to the present invention includes a base layer adhered to the display window; an adhesive layer laminated on the bottom surface of the base layer; and a base coating layer laminated on the upper surface of the base layer, formed by curing the UV curing composition, and having a thickness of the folded portion thinner than other portions.

In this case, it is preferable that the base coating layer has a shape in which a boundary between the folded portion and the other portion is continuous by an inclined surface.

In addition, the base coating layer is preferably formed by curing a functional composition having ductility, rigidity and optical properties required for a flexible display.

In addition, it is preferable that the thickness of the thinnest portion of the folded portion is less than half that of the thickest portion of the other portions, and the thickness of the folded portion with the thinnest thickness is 25 μm or less.

In addition, it is laminated on the base coating layer, it is preferable to further include a protective layer formed by curing the UV curing composition.

In addition, the protective layer is formed along the curved surface formed on the surface of the base coating layer, it is preferable that the entire thickness is the same.

In addition, the protective layer is preferably formed by curing a functional composition having light resistance, abrasion resistance, and nail pressure resistance required on the surface of the protective sheet.

In addition, the protective layer preferably has a thickness of 15 μm or less.

On the other hand, the flexible display protective sheet manufacturing apparatus according to the present invention includes a substrate supply unit for supplying a substrate layer adhered to the display window; an applicator for applying a UV curing composition to the upper surface of the base layer; a coating layer imprint mold in which a mold pattern having a shape corresponding to a base coating layer having a thickness of a folded portion thinner than that of another portion is formed on the surface for pressing the UV curing composition; and a UV irradiator for irradiating light to the UV curing composition after imprinting.

In this case, it is preferable to further include a protective layer laminated on the base coating layer, and further include a protective layer imprint mold for imprinting the protective layer.

In addition, it is preferable that the protective layer is formed along a curved surface formed on the surface of the base coating layer, and the protective layer imprint mold has the same mold pattern as the coating layer imprint mold.

Furthermore, the method for manufacturing a flexible display protective sheet according to the present invention comprises: a base layer preparation step of supplying a base layer through a base feeder; a coating layer composition application step of applying a UV curing composition for coating on the upper surface of the base layer; A coating layer forming step of imprinting the UV curing composition for coating with a coating layer imprint mold to form a base coating layer having a thickness of the folded portion thinner than other portions; and a coating layer curing step of curing the substrate coating layer by irradiating ultraviolet rays.

In this case, a protective layer composition coating step of applying a protective UV curing composition on the cured substrate coating layer; a protective layer forming step of imprinting the protective UV curing composition with a protective layer imprint mold to form a protective layer; and a protective layer curing step of curing the protective layer by irradiating ultraviolet rays to the protective layer.

In the present invention as described above, the UV curing coating layer is formed on the substrate layer by the imprinting method. Accordingly, by providing one or more UV-curable coating layers having a function by imphilinting, the effect of protecting the display window is improved.

In addition, the present invention locally differentiates the thickness of the UV-cured substrate coating layer to form a thickness of the folded portion thinner than the rest. Accordingly, the folding operation characteristic of the flexible display is prevented from being deteriorated.

1 is a state diagram of using a flexible display protective sheet according to the present invention.
2 is a cross-sectional view showing a flexible display protective sheet according to the present invention.
3 is a cross-sectional view showing various embodiments of the base coating layer of the present invention.
4 is a flowchart illustrating a method for manufacturing a flexible display protective sheet according to the present invention.
5 is a view showing an apparatus for manufacturing a flexible display protective sheet according to the present invention for each manufacturing step.

Hereinafter, a flexible display protective sheet according to a preferred embodiment of the present invention, a manufacturing apparatus therefor, and a manufacturing method will be described in detail with reference to the accompanying drawings.

First, the flexible display protection sheet of the present invention is adhered to the display window of a terminal device capable of folding operation, and the terminal device is a typical smartphone, but may also be applied to a tablet or a notebook computer. In addition, if it is possible to fold, a monitor provided with only a display and the like are included in the terminal device.

1 illustrates an example of an in-folding type foldable phone that is folded in a vertical direction. Here, the protective sheet 10 of the present invention is attached to the display window of the foldable phone so that the folding operation in the folding part (FOL) is smoothly performed while protecting the window such as ultra thin glass (UTG). .

Of course, if it can be laminated (coated) on the surface through UV curing by adopting a selectable UV curing composition, a resin material such as polyimide (PI) may also be included in the display window to which the present invention is applied.

Example - Protective Sheet

As shown in FIG. 2 , the flexible display protective sheet 10 of the present invention includes a base layer 11 , an adhesive layer 11a and a base coating layer 12 as an embodiment. In another preferred embodiment, a release layer 11b, a protective layer 13 and a surface treatment layer 14 may be further included.

Accordingly, the adhesive layer 11a and the release layer 11b are sequentially stacked on the bottom surface of the substrate layer 11, and the substrate coating layer 12, the protective layer 13 and the surface treatment layer 14 are sequentially stacked on the top surface. are stacked In addition, another functional layer may be added between each layer if necessary.

In this configuration, the base layer 11 is formed of a material such as polyethylene (PET), polycarbonate (PC), and polyurethane (TPU) and is adhered to the window of the display. (11a) is formed.

The adhesive layer 11a is formed of a transparent adhesive so that transparency can be maintained, and as an embodiment, a silicone resin-based adhesive can be applied so that it does not leave marks on the attachment surface of the display window while repeating peeling and attaching is possible.

The release layer 11b is provided by being attached to the adhesive layer 11a. For example, release paper (release paper) is applied, and when the protective sheet 10 is attached to the display window, the release layer 11a is exposed so that the adhesive layer 11a is exposed. 11b) is removed first.

The base coating layer 12 is to be laminated on the upper surface of the base layer 11, and is formed by curing the UV curing composition.

The UV curing composition for forming the base coating layer 12 is, for example, a 1-functional monomer, a 2-functional oligomer, a 3-functional oligomer, a photo initiator and an additive. can

In this case, the 1-functional unit and the 2-functional oligomer are chosen to provide high hardness and the 3-functional oligomer to provide a low shrinkage (wrinkle) rate to form a UV curable composition with the photoinitiator and additives.

The proportion may consist of 20 to 40 parts by weight of the 1-functional unit, 10 to 20 parts by weight of the 2-functional oligomer, 40 to 60 parts by weight of the 3-functional oligomer, 1 to 8 parts by weight of the photoinitiator, and 0.1 to 1 part by weight of the additive.

At this time, the base coating layer 12 of the present invention is divided into a folded portion and other portions, and the thickness of the folded portion is formed thinner than other portions.

As will be described in more detail below, the base coating layer 12 is a coating layer shape with a controlled thickness is determined by imprinting the 'UV curing composition (C1) for coating' applied on the base layer 11, and the It is then cured by irradiation with ultraviolet rays.

In addition, the folded portion formed by imprinting is relatively thin, wherein the folded portion may include at least a folding line (FOL). That is, it may include a portion extending outside a predetermined region including the fold line portion.

At this time, the base coating layer 12 has a boundary formed on the folded portion with a thin thickness and another portion on the outside thereof, and in an embodiment, it is preferable to have an inclined surface S at the boundary so that portions having different thicknesses have a continuous shape. Do.

If the base coating layer 12 is separated from the thin part and the other relatively thick parts using the continuous inclined surface S, the folding operation is smooth while improving the light transmittance and visibility even when the protective sheet 10 is attached. let it be done

However, since the base coating layer 12 is formed on the upper surface of the base layer 11 to protect the base layer 11, a functional composition is used as a raw material. As the functional composition, one having ductility and rigidity required for a flexible display may be applied.

For example, the substrate coating layer 12 is UV-coated using an acrylate-based functional composition to protect a display window such as UTG from external impact or continuous pressing (by nails or pen), and has a hardness of HB to 2H. .

In addition, the thickness of the thinnest portion (t ₂ ) of the folded portion is less than half that of the thickest portion (t ₁ ) among other portions, and the thickness of the folded portion with the thinnest thickness is preferably 25 μm or less.

For example, most of the parts except for the folded portion for surface protection are imprinted to have a thickness of 15 μm to 100 μm, and the folded portion requiring flexibility is imprinted to have a thickness of 2 μm to 15 μm.

In this way, when the thickness of the folded portion is 1/2 or less, it is possible to maintain a small curvature even when the display window is completely folded based on the folding line, and to prevent wrinkles from occurring in the folded portion.

2 (a) to (d) show various other embodiments of forming the folded portion of the base coating layer 12 . As shown, the base coating layer 12 having a different thickness can be applied in various types.

Specifically, as shown in (a) of FIG. 2 , the substrate coating layer 12-1 in which the folded portion having a thin thickness is formed in a curved shape may be applied. In this case, the foldability is good, the visibility is improved, and there is no sense of difference even when touched.

The folded portion of the substrate coating layer 12-2 may be formed in a triangular shape as shown in FIG. 2(b). In this case, the folding operation is smooth, but visibility is somewhat reduced in the bent portion, and a jamming phenomenon may occur when touched. .

In addition, as shown in (c) of FIG. 2 , the protective sheet conforms to the shape of the display window, except that the folded portion is thin. Accordingly, when the edge of the display is rounded, the edge may be formed by bending both edges of the base coating layer 12 - 3 .

In addition, when the display is folded in multiple stages as shown in (d) of FIG. 2, the folded portion of the substrate coating layer 12-4 may also be formed in a plurality of places in accordance with it, and from above, the folded portion is in the horizontal direction, unlike in the vertical direction. A folded portion may be formed.

Meanwhile, the present invention may further include a protective layer 13 . The protective layer 13 is a second light-cured layer laminated on the base coating layer 12 corresponding to the first light-cured layer, and protects a surface touched by a user.

To this end, the protective layer 13 is laminated on the base coating layer 12, and is formed by curing the UV curing composition. That is, the protective layer 13 is formed by irradiating ultraviolet rays after imprinting the 'protective UV curing composition (C2)' applied on the base coating layer 12 .

A functional composition is also used for the protective UV curing composition (C2) for forming the protective layer 13 . As a functional composition used for this layer, one having the hardness, optical properties (light resistance or UV protection) required for the sheet surface, and resistance to nail compression may be applied.

For example, the protective UV curing composition (C2) may be applied to a composition comprising a 1-functional monomer, a 2-functional oligomer, a 9-functional oligomer, a photoinitiator and an additive.

In this case, the 1-functional monomer provides high toughness, the 2-functional oligomer provides high flexibility, and the 9-functional oligomer provides high hardness and high abrasion resistance. choose to do

The ratio may consist of 20 to 40 parts by weight of the 1-functional unit, 10 to 20 parts by weight of the 2-functional oligomer, 30 to 40 parts by weight of the 9-functional oligomer, 1 to 5 parts by weight of the photoinitiator, and 0.1 to 1 parts by weight of the additive.

At this time, the protective layer 13 is formed along the curved surface formed on the surface of the base coating layer 12, and it is preferable that the entire thickness is the same. Through this, it is possible to provide a coating layer role while maintaining the thickness difference formed in the base material protective layer 13 .

In addition, the thickness of the protective layer 13 is preferably 15 μm or less to be thinner than the thick portion of the base coating layer 12 . More preferably, the protective layer 13 has a thickness of 1 μm to 10 μm, and if the thickness of the protective layer 13 is too thin, it is vulnerable to nail pressure, and if it is too thick, it interferes with the folding operation. For this purpose, the hardness is H ~ 7H.

However, it is preferable that the protective layer 13 has the same thickness as a whole, but some errors in the manufacturing process, deformation of fine dimensions according to the shape surface, and thickness or shape deformation within the design range for adding functionality It will be obvious that it is also possible.

The surface treatment layer 14 may be coated on the base coating layer 12 . In addition, when the protective layer 13 is further included, it may be coated on the protective layer 13 . For example, the surface treatment layer 14 may be subjected to various other functional treatments such as anti-fingerprint (AF) coating for fingerprint prevention and antibacterial treatment.

Example - Manufacturing apparatus

Hereinafter, an apparatus for manufacturing a flexible display protection sheet according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention includes a substrate feeder 20 , an applicator 30 , a coating layer imprint mold 40 , and a UV irradiator 50 . In addition, it may further include other components for a post-processing process, such as the protective layer imprint mold 60 and the cutter 70 (see FIG. 5 ).

In the present invention of this configuration, as shown in the embodiment, the coating layer imprint mold 40 and the protective layer imprint mold 60 are disposed on the substrate layer 11 to be molded, so that the mold pattern can be installed to face the lower side. have.

In addition, although not shown, the coating layer imprint mold 40 and the protective layer imprint mold 60 may be disposed under the base layer 11 and installed so that the mold pattern faces upward.

In addition, the substrate feeder 20 may be applied to a roll type supply method using a supply reel to continuously supply the substrate layer 20 , in this case the applicator 30 , the coating layer imprint mold 40 , and the UV irradiator 50 . ) may be sequentially installed along the transport direction of the base layer 20 .

More specifically, the substrate feeder 20 supplies the substrate layer 11 that is adhered to the display window, and it is preferable that the substrate layer 11 has an adhesive layer 11a and a release layer 11b laminated in advance. Do.

As shown in the embodiment, when the substrate layer 11 is supplied in a state that is cut to a size suitable for one display window, the substrate feeder 20 is applied with a vacuum suction base table so that the substrate layer 11 is adsorbed and fixed. It can be imprinted in a state of being

On the other hand, when the substrate layer 11 is continuously supplied in a roll manner as described above, the substrate feeder 20 may include a supply reel and a tension roller, and the substrate layer 11 is transferred and sequentially to form a cured coating layer.

The applicator 30 applies the UV curable composition on the upper surface of the base layer 11, for example, an injector and injection that injects the 'UV curable composition (C1) for coating', which is a liquid functional composition, into the base layer 11. It may include a roller that evenly spreads the UV curing composition.

The coating layer imprint mold 40 is for an imprinting operation, and a mold pattern is formed on the surface for pressing the UV curing composition. The malt pattern is formed in a shape corresponding to the base coating layer 12 in which the thickness of the folded portion is thinner than that of the other portions.

Specifically, the coating layer imprint mold 40 is a mold in which the portion that presses the thin folded portion of the base coating layer 12 protrudes relatively higher than the other portions (protrudes by the difference in thickness on the base coating layer). A pattern is formed.

The UV irradiator 50 irradiates light to the UV curing composition after imprinting, and any one or more of a wavelength and an irradiation time may be adjusted within a specific bandwidth according to the UV curing composition.

The protective layer imprint mold 60 is for imprinting the protective layer 13 laminated on the base coating layer 12, and after applying the 'protective UV curing composition (C2)' on the cured base coating layer 12, it is pressurize

At this time, the protective layer 13 is formed along the curved surface formed on the surface of the base coating layer 12, and the thickness thereof is the same (uniform) as a whole. Accordingly, the protective layer imprint mold 60 may be the same as the coating layer imprint mold 40 having a mold pattern having a certain size tolerance within the design range.

Furthermore, the device for applying the protective UV curing composition (C2) may be the same or similar to that of the applicator 30 for forming the base coating layer 12 or as described above, which is the UV for curing the UV composition. The irradiator 50 is also the same.

Meanwhile, when the surface treatment layer 14 is further included in the present invention, the surface treatment layer 14 may be coated on the substrate coating layer 12 . In addition, when the protective layer 13 is further included, it may be coated on the protective layer 13 .

For this purpose, a surface treatment applicator (coater) may be further included, and for example, the surface treatment applicator performs various other functional treatments such as anti-fingerprint (AF) coating to prevent fingerprints and antibacterial.

In addition, after the coating is completed, it is cut with the cutter 70 . The cutter 70 stacks all the layers designed on the base layer 11 and cuts it in a shape corresponding to the display window, and the cutter 70 is, for example, a cutting blade installed along the window edge shape at the lower part of the press. may include.

Example - Preparation method

Hereinafter, a method for manufacturing a flexible display protection sheet according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 3 with reference to FIG. 4, the method for manufacturing a flexible display protective sheet according to the present invention comprises a base layer preparation step (S11), a coating layer composition application step (S12), a coating layer forming step to form a base coating layer 12. (S13) and a coating layer curing step (S14).

In addition, it includes a protective layer composition coating step (S15), a protective layer forming step (S16) and a protective layer curing step (S17) to form the protective layer 13, and further includes a post-treatment step (S18) if necessary .

Here, a mold for imprinting is prepared prior to the base layer preparation step (S11), and the base layer 11 is prepared after selecting and preparing a UV curing composition suitable for a flexible display. The prepared substrate layer 11 is supplied through the substrate feeder (20).

At this time, an adhesive layer 11a is formed on the bottom surface of the base layer 11, and a release layer 11b, that is, a release paper (release paper) is attached to the adhesive layer 11a, and in an embodiment, the base layer 11 ), the adhesive layer 11a and the release layer 11b may be separately manufactured and then supplied in a laminated state.

As described above, the base layer 11 may be made of a sheet made of a material such as polyethylene (PET), polycarbonate (PC), and polyurethane (TPU), and the adhesive layer 11a may be formed to maintain transparency. It is formed with a transparent adhesive.

Next, in the coating layer composition application step (S12), that is, in the first coating solution application step, the 'UV curing composition (C1) for coating' is applied to the upper surface of the base layer 11 .

The UV curable composition for coating (C1) is for forming the base coating layer 12 to be laminated on the upper surface of the base layer 11, and the base coating layer 12 is formed when the UV curable composition is subsequently cured.

At this time, since the base coating layer 12 protects the base layer 11, it includes a functional composition. As the functional composition, one having ductility and rigidity required for a flexible display may be applied.

For example, the base coating layer 12 uses an acrylate-based functional composition to protect a display window such as UTG from external impact or continuous pressing (by a nail or pen).

Next, the coating layer forming step (S13) is a step of imprinting the UV curing composition, imprinting the UV curing composition (C1) for coating with the coating layer imprint mold 40, and the thickness of the folded portion is thinner than the other portions of the substrate coating layer (12) to form

The base coating layer 12 is divided into a folded portion and other portions, and the thickness of the folded portion is formed thinner than other portions.

Further, the folded portion formed by imprinting has a relatively thin thickness, wherein the folded portion may include at least a fold line. That is, it may include a portion extending outside a predetermined region including the fold line portion.

At this time, the base coating layer 12 has a boundary formed on the folded portion with a thin thickness and another portion on the outside thereof, and in an embodiment, it is preferable to have an inclined surface S at the boundary so that portions having different thicknesses have a continuous shape. Do.

If the base coating layer 12 is separated from the thin part and the other relatively thick parts using the continuous inclined surface S, the folding operation is smooth while improving the light transmittance and visibility even when the protective sheet 10 is attached. let it be done

In addition, the thickness of the thinnest portion (t ₂ ) of the folded portion is less than half that of the thickest portion (t ₁ ) among other portions, and the thickness of the folded portion with the thinnest thickness is preferably 25 μm or less.

For example, most of the parts except for the folded portion for surface protection are imprinted to have a thickness of 15 μm to 100 μm, and the folded portion requiring flexibility is imprinted to have a thickness of 2 μm to 15 μm.

When the thickness of the fold is less than 1/2, it is possible to maintain a small curvature even when the display window is completely folded based on the fold line, and to prevent wrinkles from occurring in the fold.

Next, in the coating layer curing step (S14), the UV curing composition (C1) for the imprinted coating is cured by irradiating ultraviolet rays to the base coating layer 12 . UV irradiation is irradiated through a UV irradiator 50 such as a UV LED.

UV irradiation is an embodiment by moving the UV irradiator 50 over the substrate supplier 20 to irradiate ultraviolet rays or the substrate layer 11 coated with the substrate coating layer 12 to pass the path in which the UV irradiator 50 is installed. UV curing is carried out in the transport method.

Therefore, the 'UV curing composition (C1) for coating' applied on the base layer 11 is imprinted to determine the layer shape of which the thickness is adjusted, and then cured by the irradiated UV light to the base coating layer 12 ) is fixed and has a hardness of HB ~ 2H.

Next, in the protective layer composition application step (S15), that is, in the second coating liquid application step, a 'protective UV curing composition (C2)' is applied to the upper surface of the base coating layer 12 .

The protective UV curing composition (C2) is for forming the protective layer 13 to be laminated on the upper surface of the base coating layer 12, and when the UV curing composition is subsequently cured, the protective layer 13 is formed. The protective layer 13 is a second light-cured layer laminated on the base coating layer 12 corresponding to the first light-cured layer, and protects a surface touched by a user.

In this case, the protective UV curing composition (C2) for forming the protective layer 13 is also a functional composition is used. As a functional composition used for this layer, one having the required hardness, optical properties (light resistance or UV protection) and resistance to nail squeezing may be applied to the sheet surface.

Next, the protective layer forming step (S16) is a step of imprinting the UV curable composition, and the protective layer 13 is formed in a designed shape by imprinting the protective UV curable composition (C2) with the passivation layer imprint mold 60 .

At this time, the protective layer 13 is formed along the curved surface formed on the surface of the base coating layer 12, and it is preferable that the entire thickness is the same. Through this, it is possible to provide a coating layer role while maintaining the thickness difference formed in the base material protective layer 13 .

Accordingly, the protective layer imprint mold 60 may be applied to have a mold pattern having the same or similar shape as the coating layer imprint mold 40 , and is preferably installed spaced apart from the rear end of the protective layer imprint mold 60 to make the secondary imprinting is done.

The thickness of the protective layer 13 formed in this way is preferably 15 μm or less to be thinner than the thick portion of the base coating layer 12 . More preferably, the protective layer 13 is formed to a thickness of 1um ~ 10um. If the thickness of the protective layer 13 is too thin, it is vulnerable to nail pressure, and if it is too thick, it interferes with the folding operation.

Next, in the protective layer curing step (S17), the protective layer 13 is irradiated with ultraviolet rays to cure the imprinted protective UV curing composition (C2). UV irradiation is irradiated through a UV irradiator 50 such as a UV LED.

UV irradiation is an embodiment by moving the UV irradiator 50 over the substrate feeder 20 to irradiate ultraviolet rays or the substrate layer 11 to pass the UV irradiator 50 for curing the protective layer 13 is installed. UV curing is carried out in the transport method.

Therefore, the shape of the layer having the pattern of the base is determined by imprinting the 'UV curing composition (C2) for protection' applied on the substrate coating layer 12, and then it is cured by irradiating ultraviolet rays to change the shape of the protective layer 13 is fixed Hardness is H ~ 7H.

Next, in the post-treatment step (S18), the base coating layer 12 and the protective layer 13 corresponding to the first UV cured layer and the second UV cured layer are sequentially laminated on the base layer 11 to give essential functionality. Subsequent processes such as surface treatment and cutting are performed.

At this time, the surface treatment layer 14 is coated on the base coating layer 12 for surface treatment, or when the above-described protective layer 13 is further included, the surface treatment layer 14 may be coated on the protective layer 13 . have. For example, the surface treatment layer 14 may be subjected to various other functional treatments such as anti-fingerprint (AF) coating for fingerprint prevention and antibacterial treatment.

In addition, after the surface treatment is finished, the cutting process may be performed according to the shape of the display window. To this end, all layers designed on the base layer 11 are laminated and then cut into a shape corresponding to the display window with a cutter 70 . The cutter 70 may include, for example, a cutting blade installed along the window edge shape at the lower part of the press.

In the above, specific embodiments of the present invention have been described above. However, the spirit and scope of the present invention is not limited to these specific embodiments, but various modifications and variations are possible within the scope that does not change the gist of the present invention. You will understand when you grow up.

Therefore, since the embodiments described above are provided to fully inform those of ordinary skill in the art to which the present invention belongs the scope of the invention, it should be understood that they are exemplary and not limiting in all respects The invention is only defined by the scope of the claims.

10: protective sheet
11: base layer
11a: adhesive layer
11b: release layer
12: substrate coating layer
13: protective layer
14: surface treatment layer
20: substrate feeder
30: applicator
40: coating layer imprint mold
50: UV irradiator

Claims (13)

a substrate layer 11 that is adhered to the display window;
an adhesive layer (11a) laminated on the bottom surface of the base layer (11);
Doedoe laminated on the upper surface of the base layer 11, the base coating layer 12 is formed by curing the UV curing composition and the thickness of the folded portion is thinner than other portions; and
A protective layer 13 laminated on the base coating layer 12 and formed by curing the UV curing composition;
The protective layer 13 is formed along the curved surface formed on the surface of the base coating layer 12, the entire thickness is the same,
The folded portion of the base coating layer 12 is a pressing surface pressed by the coating layer imprint mold 40,
The protective layer (13) is pressed by the protective layer imprint mold (60), and the flexible display protective sheet, characterized in that it includes a curved portion of the pattern corresponding to the folded portion. According to claim 1,
The base coating layer 12 is,
A flexible display protective sheet, characterized in that the boundary between the folded portion and the other portion is formed in a continuous shape by an inclined surface (S). According to claim 1,
The base coating layer 12 is,
A flexible display protective sheet, characterized in that it is formed by curing a functional composition having ductility and rigidity required for a flexible display. According to claim 1,
The base coating layer 12 is,
The thinnest portion of the folded portion is less than half thinner than the thickest portion of the other portions, and the thickness of the thinnest folded portion is 25um or less. delete delete According to claim 1,
The protective layer 13,
A flexible display protective sheet, characterized in that it is formed by curing a functional composition having the required hardness, optical properties and resistance to nail compression on the surface of the protective sheet. According to claim 1,
The protective layer 13,
A flexible display protective sheet, characterized in that the thickness is less than 15um. a substrate supplier 20 for supplying the substrate layer 11 that is adhered to the display window;
an applicator 30 for applying a UV curing composition to the upper surface of the base layer 11;
a coating layer imprint mold 40 in which a mold pattern having a shape corresponding to the base coating layer 12 having a thickness of the folded portion thinner than other portions is formed on the surface for pressing the UV curing composition;
UV irradiator 50 for irradiating light to the UV curing composition after imprinting; and
and a protective layer imprint mold (60) imprinting the protective layer (13) to form a protective layer (13) laminated on the base coating layer (12). delete 10. The method of claim 9,
The protective layer 13 is formed along a curved surface formed on the surface of the base coating layer 12,
The protective layer imprint mold (60) is a flexible display protective sheet manufacturing apparatus, characterized in that it has the same mold pattern as the coating layer imprint mold (40). A substrate layer preparation step (S11) of supplying the substrate layer 11 through the substrate feeder 20;
a coating layer composition application step (S12) of applying a UV curing composition (C1) for coating on the upper surface of the base layer 11;
A coating layer forming step (S13) of imprinting the UV curing composition (C1) for coating with a coating layer imprint mold 40 to form a base coating layer 12 having a thickness of the folded portion thinner than other portions;
a coating layer curing step (S14) of curing the base coating layer 12 by irradiating ultraviolet rays;
a protective layer composition application step (S15) of applying a protective UV curing composition (C2) on the cured substrate coating layer 12;
a protective layer forming step (S16) of imprinting the protective UV curing composition (C2) with a protective layer imprint mold (60) to form a protective layer (13); and
and a protective layer curing step (S17) of curing the protective layer by irradiating ultraviolet rays to the protective layer (13).
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