KR102185698B1 - Protective film for curved display - Google Patents

Abstract

The present invention provides a protective film attachable to the surface of a curved display without UV curing by including a functional layer including at least one of urethane acrylate, silicone and polyurethane. The present invention can maintain the curved shape by offsetting the restoring force of the substrate layer, and thus the entire surface of the display including the curved surface can be protected with a full cover.

Description

Protective film for curved display {Protective film for curved display}

This specification describes a protective film attachable to the surface of a curved display.

Unlike conventional flat displays, which have become the mainstream, devices with curved displays are increasing, whereas conventional protective films are specialized for flat displays, so when applied to curved displays, they are lifted on the curved surface as shown in FIG. 1 as time elapses. There is a problem that the phenomenon occurs. This is due to the resilience of polyethylene terephthalate (PET), which is generally used in protective films. A protective film has been developed to improve this, but when the adhesive strength is increased, there is a problem that the ease of use is lowered due to the high adhesive force when the protective film is first attached, and the adhesive is transferred when the protective film is removed later.

Accordingly, there are the following three methods as other methods for applying to curved displays that have been commonly used. First, as a method of attaching only the flat portion excluding the curved portion as shown in FIG. 2, the advantage of this method is that the existing protective film for flat display can be used with simple size adjustment, but there is a big disadvantage that the curved portion is vulnerable to external stimuli. However, it is not suitable for meeting the elevated consumer eye level. Another method is a protective film manufactured in a form in which a curved portion is molded for application to a curved display known as a forming type protective film as shown in FIG. 3. However, this method has drawbacks in that it can be used only in certain mobile devices and lowered the touch sensitivity due to voids in the curved portion. Another method, the UV-curing type protective film as shown in FIG. 4, is currently known as the most adhesive and functionally stable form, but has the inconvenience of having to block UV in the distribution stage of the protective film and the inconvenience of requiring an additional UV curing machine. have.

Republic of Korea Patent Publication No. 10-1697049 is a protective film corresponding to FIG. 4, and a UV curing machine is required to use the film, and it is difficult to reuse the protective film after detaching or attaching the protective film through UV curing. There is this. In addition, there are difficult conditions in the handling of UV protection during the distribution process of the protective film. Republic of Korea Patent Publication No. 10-1803268 is an existing protective film for a flat panel display corresponding to FIG. 1, and the film is a type of coating a self-healing coating layer without a general hard coat. The film controls adhesive strength when applied to a curved surface. Korean Patent Laid-Open Publication No. 10-2018-0116710 is a film in which the methods of FIGS. 1 and 4 are mixed, and two types of UV curing type adhesive layers are applied. In order to use the film, a UV hardener and a vacuum chamber Is essential.

Korean Registered Patent Publication No. 10-1697049 Republic of Korea Patent Publication No. 10-1803268 Republic of Korea Patent Publication No. 10-2018-0116710

In one aspect, the problem to be solved by the present invention is to provide a protective film that can be attached to the surface of a curved display without UV curing.

In one aspect, the present invention is a base layer comprising at least one of polyethylene terephthalate, polypropylene, polyethylene, polyurethane and polyimide; A hard coat layer including at least one of an acrylic resin, a urethane resin, or a silicone resin laminated on the base layer; A functional layer including at least one of urethane acrylate, silicone, and polyurethane laminated under the base layer; An acrylic adhesive or silicone adhesive laminated under the functional layer; And it provides a protective film for a curved display comprising an adhesive layer including an adhesive release film laminated under the adhesive layer.

In one aspect, the protective film according to the present invention maintains physical properties such as high hardness and impact resistance required for the protective film by including a functional layer, while maintaining the resilience of the base layer as shown as an exemplary reference of the present invention in FIG. Since the curved surface can be maintained by offsetting, the entire surface of the display including the curved surface can be protected with a full cover. In addition, no press marks remain even on external stimuli, and UV curing is not required when attaching or detaching the film to the display, so it has excellent distribution and ease of use.

1 is a diagram showing a conventional polyethylene terephthalate (PET) protective film applied to a curved display.
2 is a diagram showing a conventional protective film applied to a curved display and attaching only a flat portion.
3 is a diagram illustrating a forming type protective film applied to a curved display.
4 is a diagram showing a UV curing type protective film applied to a curved display.
5 is a diagram showing a protective film for a curved display according to an embodiment of the present invention applied to a curved display.
6 is a hard coat layer 20, a base layer 30, a functional layer 40, an adhesive layer 50, and an adhesive release film 60 in order of a protective film stacked according to an embodiment of the present invention. It is a schematic diagram.
7 is a top protective film 10, a hard coat layer 20, a base layer 30, a functional layer 40, an adhesive layer 50, and an adhesive release film 60 in order according to an embodiment of the present invention. It is a schematic diagram showing the laminated protective film.
8 is a diagram showing the properties of restoring pressing and maintaining shape of a functional layer according to an embodiment of the present invention.
9 is a diagram showing the results of evaluating the structure, curved surface protection ability, circulation, convenience of use, and reliability of an embodiment and comparative examples of the present invention.

The present invention relates to a protective film for a curved display. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present specification, the term "curved display" refers to a display in which some or all of the surfaces of a flat display can be bent or bent at a constant curvature, and a position at which it is bent is not limited. Further, the type of the display or the device to which the display is applied is not limited, but the display may be a curved tempered glass. For example, the curved display may include an edge display, a bending display, a curved display, a foldable display, a rollable display, a flexible display, and the like. I can.

6 and 7 are attached to illustrate exemplary forms of the present invention. The film according to one embodiment may include a hard coat layer 20, a base layer 30, a functional layer 40, an adhesive layer 50, and an adhesive release film 60 (see FIG. 6). In addition, the film according to one embodiment may include a top protective film 10, a hard coat layer 20, a base layer 30, a functional layer 40, an adhesive layer 50, and an adhesive release film 60. Can (see Fig. 7).

Conventional polyethylene terephthalate (PET)-based protective films exhibit excitement when time elapses due to the nature of PET to be restored again when applied to a curved surface. While thinning the thickness of PET improves some of its resilience, there is a problem that pressing marks due to external stimulation occur. In addition, a base film with relatively weak resilience, such as polyethylene (PE) and polyurethane (PU), can be used to improve the adhesive strength of the curved portion, but the above materials are used because a large amount of pressing marks are generated when external stimulation occurs. As time increases, the aesthetics decrease.

According to the curvature of the display by offsetting the restoring force of the substrate layer due to the shape-retaining property without generating a press mark due to an external impact due to the press restoration property as exemplarily shown in FIG. 8, The above problem was solved by including a functional layer capable of maintaining a curved shape under the base layer.

As an embodiment, the functional layer is not limited as long as it is a transparent material free of shape deformation. For example, since the functional layer includes at least one of urethane acrylate, silicone and polyurethane, UV post-curing is not required when applied to the display surface, and can be provided in a rigid form. The material as described above is a more specific example, and the functional layer may include a urethane acrylate oligomer. The functional layer photo-cures the urethane acrylate oligomer to form a thin layer, thereby providing excellent compression restoration properties and shape retention properties to the protective film through high transparency, flexibility, bending resistance and toughness of urethane acrylate. . In one embodiment, the thickness of the functional layer may be 100 μm or less, and specifically 75 to 100 μm. More specifically, the thickness of the functional layer is 75 μm or more, 76 μm or more, 77 μm or more, 78 μm or more, 79 μm or more, 80 μm or more, 81 μm or more, 82 μm or more, 83 μm or more, 84 μm or more, 85㎛ or more, 86㎛ or more, 87㎛ or more, 88㎛ or more, 89㎛ or more, 90㎛ or more, 91㎛ or more, 92㎛ or more, 93㎛ or more, 94㎛ or more, 95㎛ or more, 96㎛ or more, 97㎛ It may be more than, 98㎛ or more, or 99㎛ or more, and 100㎛ or less, 99㎛ or less, 98㎛ or less, 97㎛ or less, 96㎛ or less, 95㎛ or less, 94㎛ or less, 93㎛ or less, 92㎛ or less, 91 Μm or less, 90µm or less, 89µm or less, 88µm or less, 87µm or less, 86µm or less, 85µm or less, 84µm or less, 83µm or less, 82µm or less, 81µm or less, 80µm or less, 79µm or less , 78 μm or less, 77 μm or less, or 76 μm or less. If the thickness of the functional layer is less than 75 μm, the film may be torn, or a lifting phenomenon may occur when applied to a curved display surface. If the thickness of the functional layer is more than 100 μm, pressing marks caused by external stimuli may remain without being restored.

As an embodiment of the present invention, the base layer may include, without limitation, various types of films requested by the user. For example, it may include one or more of polyethylene terephthalate, polypropylene, polyethylene, polyurethane and polyimide. At this time, the polyimide may be a transparent polyimide (CPI), and the polyurethane may be a thermoplastic polyurethane (TPU). More specifically, the base layer may include polyethylene terephthalate (PET) in consideration of a compression restoration property. In addition, the thickness of the substrate layer according to an embodiment of the present invention may be, for example, 10 to 50 μm, specifically 10 to 30 μm. More specifically, the thickness of the substrate layer is 10 μm or more, 12 μm or more, 14 μm or more, 16 μm or more, 18 μm or more, 20 μm or more, 22 μm or more, 24 μm or more, 26 μm or more, 28 μm or more, 30㎛ or more, 32㎛ or more, 34㎛ or more, 36㎛ or more, 38㎛ or more, 40㎛ or more, 42㎛ or more, 44㎛ or more, 46㎛ or more or 48㎛ or more, 50㎛ or less, 48㎛ or less, 46µm or less, 44µm or less, 42µm or less, 40µm or less, 38µm or less, 36µm or less, 34µm or less, 32µm or less, 30µm or less, 28µm or less, 26µm or less, 24µm or less, 22µm Hereinafter, it may be 20 μm or less, 18 μm or less, 16 μm or less, 14 μm or less, or 12 μm or less. When the thickness of the base layer is less than 10 μm, tearing of the entire protective film may occur, and when the thickness of the base layer is more than 50 μm, a lifting phenomenon may occur in the curved portion of the display due to the strong restoring force of the material of the base layer itself.

In one embodiment of the present invention, by introducing the functional layer, the hard coat layer laminated on the base layer is a layer for protecting the display surface by preventing direct touch or external friction or impact, scratches, stamping, contamination, etc. As long as it is a generally used transparent material, it may be included without limitation. For example, the hard coat layer may be a UV-curable hard coat layer, and may include at least one of acrylic resin, urethane resin, or silicone resin as a base. For example, it may be an acrylic resin containing an acrylic acid monomer and an acrylic acid ester polymer. As an embodiment, the hard coating layer may further include a leveling agent, an antifoaming agent, and a silicone type inorganic material as an additive in consideration of physical properties and processing characteristics. In one embodiment, the thickness of the hard coat layer may be 5 μm or less, specifically 1 to 5 μm, and more specifically 1 to 3 μm. Specifically, the thickness of the hard coat layer may be 5㎛ or less, 4.5㎛ or less, 4㎛ or less, 3.5㎛ or less, 3㎛ or less, 2.5㎛ or less, 2㎛ or less or 1.5㎛ or less, 1㎛ or more, 1.5㎛ It may be at least 2㎛, at least 2.5㎛, at least 3㎛, at least 3.5㎛, at least 4㎛, or at least 4.5㎛. If the thickness is less than 1 μm, hardness or wear resistance performance deteriorates, and if it exceeds 5 μm, cracks may occur when attached to the curved surface of the display.

As an embodiment, the protective film may further include a top protective film laminated on the hard coat layer. The top protective film is for protecting the hard coat layer, and may be used without limitation as long as it has external contaminants and impact protection characteristics generated during distribution and product construction. For example, the top protective film may be an adhesive-coated polyethylene terephthalate type, and may have a thickness of 60 to 70 μm.

An embodiment of the present invention may include an adhesive layer under the functional layer in order to be attached to and detached from the display surface, and the adhesive layer may include an acrylic adhesive or a silicone adhesive. In one embodiment, the thickness of the adhesive layer may be 10 μm or less, specifically 7 to 10 μm. Specifically, the thickness of the hard coat layer may be 10 μm or less, 9.5 μm or less, 8 μm or less, or 7.5 μm or less, and may be 7 μm or more, 7.5 μm or more, 8 μm or more, 8.5 μm or more, 9 μm or more, or 9.5 It may be greater than or equal to µm. If the thickness is less than 7 μm, adhesion may be weak and may not be attached to the display surface, and if it exceeds 10 μm, it may remain without being restored when pressing marks are generated by external stimuli.

As an embodiment, the protective film may include an adhesive release film laminated under the adhesive layer. The release film is detachable to the adhesive layer and can be used after removal by the user during construction, and is for protection from contamination that may occur in the distribution process, manufacturing process, construction process, etc., and display protection in the technical field of the present invention Anything used in the film is not limited and may be included. For example, a fluorine release film may be used as the release film, and the thickness may be 50 to 60 μm.

A protective film for a curved display according to an embodiment of the present invention includes a base layer containing polyethylene terephthalate and having a thickness of 10 to 50 μm; A hard coat layer having a thickness of 1 to 5 μm and including at least one of an acrylic resin, a urethane resin, or a silicone resin laminated on the base layer; A functional layer having a thickness of 75 to 100 μm and including at least one of urethane acrylate, silicone and polyurethane laminated under the base layer; An adhesive layer having a thickness of 7 to 10 μm and including an acrylic adhesive or a silicone adhesive laminated under the functional layer; And an adhesive release film laminated under the adhesive layer.

A protective film for a curved display according to another embodiment of the present invention includes a base layer including polyethylene terephthalate and having a thickness of 10 to 50 μm; A hard coat layer having a thickness of 1 to 5 μm and including at least one of an acrylic resin, a urethane resin, or a silicone resin laminated on the base layer; An upper protective film laminated on the hard coat layer; A functional layer having a thickness of 75 to 100 μm and including at least one of urethane acrylate, silicone and polyurethane laminated under the base layer; An adhesive layer having a thickness of 7 to 10 μm and including an acrylic adhesive or a silicone adhesive laminated under the functional layer; And it may include an adhesive release film laminated under the adhesive layer.

The manufacturing method of the protective film for a curved display according to embodiments of the present invention,

Preparing a base layer;

Coating a functional layer on one surface of the substrate layer and laminating a release film on the functional layer;

Positioning the top and bottom of the base layer on which the functional layers are laminated;

Coating a hard coat layer on the other side of the base layer, and laminating a top protective film on the top surface of the hard coat layer;

Removing the release film laminated on the functional layer, coating the adhesive layer, and then laminating the adhesive release film thereon; And

It may include the step of reversing the top and bottom of the base layer to position the top protective film on top.

As an embodiment, the coating or manufacturing process of each layer of the film may be a roll-to-roll process (R2R) in consideration of operation convenience. In one embodiment, the functional layer may be prepared by UV curing after comma coating the functional layer composition on the base layer. As an embodiment, the hard coat layer may include UV curing after a slot die or MG coating. As an embodiment, the adhesive layer may include thermal curing after comma coating. Since the protective film manufactured according to an exemplary embodiment of the present invention is not sensitive to light, it is free in the distribution stage and is a simple attachment type, so it is not necessary to additionally provide a UV curing machine when attached to the display surface, so it is excellent in ease of use.

Hereinafter, the present invention will be described in detail with reference to Examples, Comparative Examples and Test Examples. These are only illustratively presented to explain the present invention in more detail, and that the scope of the present invention is not limited by these Examples, Comparative Examples, and Test Examples, for those of ordinary skill in the art. It will be self-evident.

[Example 1]

On a polyethylene terephthalate (PET) substrate film having a thickness of 50 μm, an acrylate resin was comma coated and UV cured to laminate a functional layer having a thickness of 100 μm. Then, the upper and lower parts of the film were turned over, and an acrylic resin was coated on the top of the base layer with a slot die, followed by UV curing, and a hard coating layer having a thickness of 3 μm was laminated. Then, a pressure-sensitive adhesive-coated polyethylene terephthalate (PET)-type top protective film was laminated on the hard coating layer, and the laminated film was flipped upside down so that the remaining uncoated side of the functional layer was placed on top. Then, a silicone adhesive was comma coated on the uncoated side of the functional layer and then thermally cured to laminate an adhesive layer having a thickness of 10 μm. Finally, after the fluorine release film was laminated on the adhesive layer, the top and bottom of the laminated film were again turned over so that the top protective film was on the top.

[Test Example 1]

As an embodiment of the present invention, whether or not a tear phenomenon occurred in the protective film according to the inclusion of a base layer was evaluated.

Specifically, Comparative Example 1 prepared in the same manner as in Example 1 and Comparative Example 1 prepared in the same manner as in Example 1 except that the base layer was not included, and the degree of tearing was compared. Each film of Example 1 and Comparative Example 2 was prepared in a rectangular shape having a width of 1 cm and a length of 6 or 10 cm, and then loaded into a tensile force evaluator so that the vertical axis of each sample was in the vertical direction. The center was taken as the measuring part except for the grip part of 2cm at both ends. Then, by pulling in the vertical direction at 100mm/min, the degree of fracture of each sample was confirmed.

Table 1 below shows the results when the measurement portion is stretched by 110%. In Comparative Example 1 in which the substrate layer was not included, tearing occurred, whereas in Example 1 including the substrate layer, tearing did not occur.

Comparative Example 1 (without base layer) Example 1 (including base layer) Whether it is torn O X

[Test Example 2]

As an embodiment of the present invention, the compression restoration property of the protective film according to the main component included in the base layer was evaluated.

First, the same preparation as in Example 1 except that polyurethane (PU, Example 2), polypropylene (PP, Example 3), and polyethylene (PE, Example 4) were included as components of the base layer. Each of the protective films was attached to the curved tempered glass of Samsung Electronics' Geloxi Note9 ^TM . Then, each sample was mounted on a pencil hardness evaluator, and a weight of 200 g was added with a pencil 5B to mark the protective film of each sample, and then the time for restoring the mark was confirmed with the naked eye. If more than 80% was restored within 1 minute, O, when the restoration was not restored even after 1 minute, X was judged.

Example 1 (PET) Example 2 (PU) Example 3 (PP) Example 4 (PE) Restorative properties O X X X

As a result, in the case of Example 1 containing polyethylene terephthalate (PET) in the base layer, it was found to be excellent in compression recovery.

[Test Example 3]

As an embodiment of the present invention, the properties of restoring the pressing of the protective film according to the thickness of the substrate layer and whether or not lifting occurs on a curved surface were evaluated.

Specifically, in Example 1, except that the thickness of the base layer is 23㎛ (Example 5), 100㎛ (Example 6), 125㎛ (Example 7), respectively, the protective film prepared in the same way, Co., Ltd. Attached to the curved tempered glass of Samsung Electronics' Geloxi Note 9 ^TM , the degree to which the pressing phenomenon caused by the external impact was restored was compared with the occurrence of the lifting phenomenon on the curved surface.

The compression restoration effect was evaluated in the same manner as in Test Example 2.

The occurrence of the lifting phenomenon was determined by attaching the curved tempered glass to each protective film before and after storing it for 1 day in a constant temperature and humidity condition of 85°C/85RH%, (i) visually checking whether there is any lifting on the curved surface, and (ii) After applying an external stimulus by applying a weight of 200 g with a pencil (5B), the result of checking whether lifting occurred or not was judged by combining the results. The results of (i) and (ii) were evaluated as X if no lifting occurred, and 0 if lifting occurred in one or both of the results (i) and (ii).

Example 5 (23㎛) Example 1 (50㎛) Example 6 (100㎛) Example 7 (125㎛) Restorative properties O O X X Surface lifting phenomenon X X O O

As a result, as shown in the table above, when the thickness of the substrate layer is 50 μm or less, it can be confirmed that the compression restoration property is excellent and the curved surface lift is improved.

[Test Example 4]

As an embodiment of the present invention, it was evaluated whether or not the curved surface of the protective film occurred according to the thickness of the functional layer.

Specifically, in Example 1, except that the thickness of the functional layer is 23㎛ (Example 8), 50㎛ (Example 9), 75㎛ (Example 10), 125㎛ (Example 11). Each protective film was attached to the curved tempered glass of Samsung Electronics Co., Ltd.'s Geloxi Note 9 ^TM , and the occurrence of the lifting phenomenon on the curved surface was compared. At this time, the compression restoration effect was evaluated in the same manner as in Test Example 2.

Example 8 (23㎛) Example 9 (50㎛) Example 10 (75㎛) Example 1 (100㎛) Example 11 (125㎛) Surface lifting phenomenon O O X X X

As a result, as shown in the table above, when the thickness of the functional layer is 75 μm or more, it can be seen that the curved surface lifting phenomenon is improved.

[Test Example 5]

As an embodiment of the present invention, the effect of restoring the pressing of the protective film according to the main component included in the functional layer and the improvement of the lifting of the curved surface was evaluated.

First, the protective films manufactured in the same manner as in Example 1 except that silicone (Example 12) and polyurethane (PU, Example 13) were each included as components of the functional layer, respectively, by Samsung Electronics Co., Ltd. 9 ^TM adhered to the curved tempered glass. Then, in the same manner as in Test Examples 2 and 3, the effect of restoring the pressing and improving the lifting of the curved surface was evaluated.

Example 1 (urethane acrylate) Example 12 (silicon) Example 13 (PU) Restorative properties O O X Surface lifting phenomenon X O X

As a result, in the case of Example 1 including urethane acrylate in the functional layer, it was found that the compression restoration property was excellent, but the curved surface lifting phenomenon did not occur.

[Test Example 6]

The curved protection ability, circulation, usability, and reliability of Example 1 and the conventional protective films (Comparative Examples 2 to 5) according to an embodiment of the present invention were evaluated and shown in FIG. 9.

As a conventional protective film, Comparative Example 2 is a partial protective film with Shield Eye ^TM , Comparative Example 3 is a conventional flat protective film, Joa Tech Easy Position ^TM , Comparative Example 4 is a forming type protective film, BIXSO 3D forming film ^TM , Comparative Example 5 Prepared Daehyun ST's SM-N960F ^TM which is a UV post-curing protective film. And each protective film was attached to the curved tempered glass of Samsung Electronics' Geloxi Note 9 ^TM .

Whether it is possible to protect the curved surface with a full cover, whether or not an additional process (e.g., UV post-curing) is required when attaching to the display surface, and the convenience of use is a separate device (e.g., a UV curing machine) when attached to the display surface. ) Is required or not.

Reliability was evaluated as to whether a lifting phenomenon occurred on a curved surface, and the method was the same as in Test Example 3.

As a result, as shown in FIG. 9, the curved surface adhesion reliability when evaluating the constant temperature and humidity reliability (85°C/85RH%) compared to the other films in Example 1, which is an embodiment of the present invention, and Comparative Example 5, which is a UV post-curing protective film It was found to be excellent. However, Comparative Example 5, which is a UV post-curing protective film, required a process of post-curing with a UV curing machine when adhering to a curved surface, so that distribution and ease of use were inferior to that of Example 1.

10: top protective film
20: hard coat layer
30: base layer
40: functional layer
50: adhesive layer
60: adhesive release film

Claims (11)

A base layer comprising polyethylene terephthalate;
A hard coat layer comprising at least one of an acrylic resin, a urethane resin, or a silicone resin laminated on the base layer;
A functional layer including a urethane acrylate oligomer laminated under the base layer;
An adhesive layer including an acrylic adhesive or a silicone adhesive laminated under the functional layer; And
Including an adhesive release film laminated under the adhesive layer,
The functional layer has a thickness of 75 to 100 μm,
The substrate layer has a thickness of 10 to 50 μm, a protective film for a curved display. delete delete delete delete The protective film of claim 1, wherein the adhesive layer has a thickness of 7 to 10 μm. The protective film of claim 1, wherein the hard coat layer has a thickness of 1 to 5 μm. The protective film of claim 1, further comprising a top protective film laminated on the hard coat layer. The method of claim 1,
A base layer comprising polyethylene terephthalate and having a thickness of 10 to 50 μm;
A hard coat layer including at least one of acrylic resin, urethane resin, or silicone resin laminated on the base layer and having a thickness of 1 to 5 μm;
A functional layer having a thickness of 75 to 100 μm, including a urethane acrylate oligomer, laminated under the base layer;
A pressure-sensitive adhesive layer having a thickness of 7 to 10 μm, including an acrylic pressure-sensitive adhesive or a silicone pressure-sensitive adhesive laminated under the functional layer; And
A protective film for a curved display comprising an adhesive release film laminated under the adhesive layer. The method of claim 1,
A base layer comprising polyethylene terephthalate and having a thickness of 10 to 50 μm;
A hard coat layer including at least one of acrylic resin, urethane resin, or silicone resin laminated on the base layer and having a thickness of 1 to 5 μm;
An upper protective film laminated on the hard coat layer;
A functional layer having a thickness of 75 to 100 μm, including a urethane acrylate oligomer, laminated under the base layer;
A pressure-sensitive adhesive layer having a thickness of 7 to 10 μm, including an acrylic pressure-sensitive adhesive or a silicone pressure-sensitive adhesive laminated under the functional layer; And
A protective film for a curved display comprising an adhesive release film laminated under the adhesive layer. The protective film for a curved display according to claim 1, wherein a part or all of the surface of the curved display is bent.

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