KR20220117393A - Window manufacturing method and display device manufacturing method including the same - Google Patents

Abstract

A window manufacturing method according to an embodiment of the present invention includes the steps of: providing a preliminary window including a window member, a first protection member attached to the window member in a first state, and an adhesive member disposed between the window member and the first protection member to attach the first protection member to the window member; a first separation step of separating the window member and the first protection member; and a bonding step of attaching a second protection member on the separated window member in a second state. The adhesion force of the adhesive member is removed at the first temperature, and the first separation step includes a step of heating the preliminary window to the first temperature. If a protection member is erroneously attached to a window member, the protection member can be removed and reattached.

Description

Window manufacturing method and display device manufacturing method including same

The present invention relates to a method of manufacturing a window and a method of manufacturing a display device including the same, and more particularly, to a method of manufacturing a window capable of reducing defects of a window protection film and a method of manufacturing a display device including the same.

A display device such as a mobile phone includes a window and a display panel. The window is made of glass or plastic and is vulnerable to external impact. With the recent launch of foldable products, the thickness of the window becomes thinner. Since such a thin window is extremely vulnerable to external impact, the surface must be covered with a protective member such as a protective film. Due to this necessity, a protective film is attached to the window during the manufacturing process of the display device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a window that can be removed and reattached when a protection member is incorrectly attached to a window member, and a method of manufacturing a display device including the same.

In embodiments, a method of manufacturing a window includes a window member, a first protective member attached to the window member in a first state, and a first protective member disposed between the window member and the first protective member to secure the first protective member to the window. providing a preliminary window including an adhesive member attached to the member; a first separation step of separating the window member and the first protection member; and attaching a second protection member on the separated window member in a second state and a bonding step to remove the adhesive force from the adhesive member at a first temperature, and the first separating step includes heating the preliminary window to the first temperature.

The window member may include thin glass.

The window member may include polyimide (PI).

The first temperature may be 40 degrees to 60 degrees.

Between the step of providing the preliminary window and the first separation step, the method further comprising the step of attaching an adhesive tape on a surface opposite to the one surface of the window member to which the first protection member is attached, wherein the adhesive tape is 2 It may include a thermally reactive tape in which the adhesive force is removed at a temperature.

The second temperature may be 75 degrees or more.

The method may further include a second separation step of separating the adhesive tape from the window member between the first separation step and the bonding step.

The second separating may include heating the adhesive tape to the second temperature.

The method may further include a washing step of washing the window member after the second separation step.

The bonding step may include attaching the second protection member on the window member through an adhesive member that loses adhesive force at the first temperature.

The first temperature may be less than the second temperature.

A plurality of different first states may be provided, and the plurality of first states and the second state may be different from each other.

In example embodiments, a method of manufacturing a display device may include providing a display panel, providing a window including a window member and a protection member disposed on the window member on the display panel, and providing the window to the display panel. attaching, wherein providing the window comprises forming the window, wherein forming the window comprises: the window member, a first protection attached to the window member in a first state providing a preliminary window comprising a member and an adhesive member disposed between the window member and the first protection member to attach the first protection member to the window member, the window member and the first protection member a first separation step of separating, and a bonding step of attaching a second protection member on the separated window member in a second state, wherein the adhesive force is removed from the adhesive member at a first temperature, and the first separation step includes: and heating the preliminary window to the first temperature.

The window member may include thin glass.

The first temperature may be 40 degrees to 60 degrees.

Between the step of providing the preliminary window and the first separation step, the method further comprising the step of attaching an adhesive tape on a surface opposite to the one surface of the window member to which the first protection member is attached, wherein the adhesive tape is 2 It may include a thermally reactive tape in which the adhesive force is removed at a temperature.

The second temperature may be 75 degrees or more.

The method may further include a second separation step of separating the adhesive tape from the window member between the first separation step and the bonding step.

The second separating may include heating the adhesive tape to the second temperature.

The first temperature may be less than the second temperature.

In the method of manufacturing a window and the method of manufacturing a display device including the same according to an embodiment of the present invention, the protection member incorrectly attached to the window member may be removed and reattached in the window manufacturing step before being provided to the display panel.

1 is a perspective view of a display device according to an exemplary embodiment.
FIG. 2A is a diagram illustrating a state in which the display device of FIG. 1 is in-folded along a first folding axis.
FIG. 2B is a diagram illustrating a state in which the display device of FIG. 1 is out-folded along a first folding axis.
FIG. 3A is a diagram illustrating a state in which the display device of FIG. 1 is in-folded along a second folding axis;
3B is a diagram illustrating a state in which the display device of FIG. 1 is out-folded along a second folding axis.
4 is a cross-sectional view of a display device according to an exemplary embodiment.
5A to 5E are views illustrating a method of manufacturing a window according to an embodiment of the present invention.
6 is a diagram illustrating a method of manufacturing a display device according to an exemplary embodiment.
7A and 7B are flowcharts illustrating a method of manufacturing a window according to an embodiment of the present invention.
8 is a graph showing a change in adhesive strength of an adhesive member and an adhesive tape according to temperature.

In this specification, when a component (or region, layer, part, etc.) is referred to as “on”, “connected to,” or “coupled to” another component, it is directly disposed/on the other component. It means that it can be connected/coupled or a third component can be placed between them.

Like reference numerals refer to like elements. In addition, in the drawings, thicknesses, ratios, and dimensions of components are exaggerated for effective description of technical content. “and/or” includes any combination of one or more that the associated elements may define.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, terms such as “below”, “bottom”, “above”, and “upper side” are used to describe the relationship between the components shown in the drawings. The above terms are relative concepts, and are described with reference to directions indicated in the drawings.

Terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification is present, and includes one or more other features, number, or step. , it should be understood that it does not preclude the possibility of the existence or addition of , operation, components, parts or combinations thereof.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Also, terms such as terms defined in commonly used dictionaries should be construed as having a meaning consistent with their meaning in the context of the relevant art, and unless they are interpreted in an ideal or overly formal sense, they are explicitly defined herein do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a perspective view of a display device according to an exemplary embodiment.

Referring to FIG. 1 , the display device DD has a rectangular shape having a short side in a first direction DR1 and a long side in a second direction DR2 crossing the first direction DR1 . However, the shape of the display device DD is not limited thereto, and various shapes of the display device DD may be provided.

The display device DD may be a foldable electronic device. Specifically, the display device DD according to an embodiment of the present invention may be folded based on the folding axes FX1 and FX2 extending in a predetermined direction. Hereinafter, a flat state without being folded is defined as a first state (ie, a non-folding state), and a folded state based on the folding axes FX1 and FX2 is defined as a second state (ie, a folding state). The folding axes FX1 and FX2 are rotation axes generated when the display device DD is folded, and may be formed by a mechanical structure of the display device DD.

The folding axes FX1 and FX2 may extend in the first direction DR1 or the second direction DR2 . In an embodiment of the present invention, the folding axis extending in the second direction DR2 is defined as the first folding axis FX1 , and the folding axis extending in the first direction DR1 is defined as the second folding axis FX2 . do. The display device DD may include one of the first and second folding axes FX1 and FX2. That is, the display device DD may be folded based on one of the first and second folding axes FX1 and FX2.

The display device DD according to the present invention may be a large display device such as a television or a monitor, or a small or medium display device such as a mobile phone, a tablet, a car navigation system, and a game machine. Of course, these are presented only as examples, and may be employed in other electronic devices without departing from the concept of the present invention.

As illustrated in FIG. 1 , the display device DD displays the image IM in the third direction DR3 on the display surface IS parallel to each of the first and second directions DR1 and DR2 . can be displayed The display surface IS on which the image IM is displayed may correspond to the front surface of the display device DD.

The display surface IS of the display device DD may be divided into a plurality of regions. The display surface IS of the display device DD may include a display area DA and a non-display area NDA.

The display area DA may be an area in which the image IM is displayed, and the user recognizes the image IM through the display area DA. The display area DA may have a rectangular shape. The non-display area NDA may surround the display area DA. Accordingly, the shape of the display area DA may be substantially defined by the non-display area NDA. However, this is illustrated by way of example, and the non-display area NDA may be disposed adjacent to only one side of the display area DA, or may be omitted. The display device DD according to an embodiment of the present invention may include various embodiments, and is not limited to any one embodiment.

The non-display area NDA is an area adjacent to the display area DA and is an area in which the image IM is not displayed. A bezel area of the display device DD may be defined by the non-display area NDA.

The display device DD according to the present invention may sense the user's input TC applied from the outside. The user's input TC includes various types of external inputs, such as a part of the user's body, light, heat, or pressure. In this embodiment, the user's input TC is shown as the user's hand applied to the front. However, this is illustrated by way of example, and as described above, the user's input TC may be provided in various forms, and the display device DD may be configured according to the structure of the display device DD. ) may sense the user's input TC applied to the side or back side, and the present invention is not limited to any one embodiment.

The display device DD may activate the display surface IS to display the image IM and sense the user's input TC. In the present embodiment, it is illustrated that the area for sensing the user's input TC is provided in the display area DA where the image IM is displayed. However, this is illustrated by way of example, and the area sensing the user's input TC may be provided in the non-display area NDA or all areas of the display surface IS.

FIG. 2A is a diagram illustrating a state in which the display device DD shown in FIG. 1 is in-folded along the first folding axis FX1, and FIG. 2B is a view showing the display device DD shown in FIG. 1 . DD) is a diagram illustrating an out-folding state along the first folding axis FX1.

1 and 2A , the display device DD may be a foldable display device. It may be folded based on a folding axis extending in a predetermined direction (eg, the first folding axis FX1 or the second folding axis FX2).

A plurality of regions may be defined in the display device DD according to an operation type. The plurality of areas may be divided into a folding area FA and at least one non-folding area NFA1 and NFA2. The folding area FA is defined between the two non-folding areas NFA1 and NFA2.

The folding area FA is an area that is folded based on the first folding axis FX1 and substantially forms a curvature. Here, the first folding axis FX1 may extend in the second direction DR2 , that is, the long axis direction of the display device DD. The folding area FA is defined as an area that is folded along the first folding axis FX1 and extends in the second direction DR2 .

As an example of the present invention, the non-folding areas NFA1 and NFA2 may include a first non-folding area NFA1 and a second non-folding area NFA2. The first non-folding area NFA1 is adjacent to one side of the folding area FA in the first direction DR1 , and the second non-folding area NFA2 is the other side of the folding area FA in the first direction DR1 . adjacent to

The display device DD may be in-folded or out-folded. Folding the display surfaces of the different non-folding areas NFA1 and NFA2 to face each other is defined as in-folding, and folding the display surfaces of the different non-folding areas NFA1 and NFA2 to face the outside is out-folding. define it as

Here, in-folding refers to folding of the display surfaces IS to face each other, and out-folding refers to folding of the rear surfaces of the display device DD to face each other.

The display device DD illustrated in FIG. 2A may be in-folded so that the display surface IS of the first non-folding area NFA1 and the display surface IS of the second non-folding area NFA2 face each other. As the first non-folding area NFA1 rotates clockwise along the first folding axis FX1 , the display device DD may be in-folded. In order to in-fold the display device DD so that the first non-folding area NFA1 and the second non-folding area NFA2 are aligned, the first folding axis FX1 is the display device in the first direction DR1 . It can be defined at the center of (DD).

Referring to FIG. 2B , the display device DD may be out-folded based on the first folding axis FX1 . The display device DD may display the image IM when the display surface of the first non-folding area NFA1 and the display surface of the second non-folding area NFA2 are exposed to the outside. In addition, the display surface of the folding area FA exposed to the outside may also display the image IM. 1 , the display device DD may display the image IM in an unfolded state. The first non-folding area NFA1, the second non-folding area NFA2, and the folding area FA each display images that provide information independent of each other, or separate parts of one image that provide one piece of information. Each can be displayed.

The display device DD may be manufactured to have both an in-folding state and an out-folding state, or may be manufactured to have any one of an in-folding state and an out-folding state.

FIG. 3A is a diagram illustrating a state in which the display device DD shown in FIG. 1 is in-folded along the second folding axis FX2, and FIG. 3B is a view showing the display device DD shown in FIG. It is a diagram illustrating an out-folded state along the folding axis FX2.

3A and 3B , the display device DD may be in-folded or out-folded based on the second folding axis FX2 . The second folding axis FX2 may extend along the first direction DR1 , that is, the short axis direction of the display device DD.

A plurality of regions may be defined in the display device DD according to an operation type. The plurality of areas may be divided into a folding area FA and at least one non-folding area NFA1 and NFA2. The folding area FA is defined between the two non-folding areas NFA1 and NFA2.

3A and 3B , the folding area FA is an area that is folded based on the second folding axis FX2 and substantially forms a curvature. The folding area FA is defined as an area that is folded along the second folding axis FX2 and extends in the first direction DR1 .

As an example of the present invention, the non-folding areas NFA1 and NFA2 may include a first non-folding area NFA1 and a second non-folding area NFA2. The first non-folding area NFA1 is adjacent to one side of the folding area FA in the second direction DR2 , and the second non-folding area NFA2 is the other side of the folding area FA in the second direction DR2 . adjacent to

In the present embodiment, one folding area FA is defined in the display device DD, but the present invention is not limited thereto. According to another embodiment of the present invention, a plurality of folding areas may be defined in the display device DD.

4 is a cross-sectional view of a display device according to an exemplary embodiment.

Referring to FIG. 4 , the display device DD includes a window 100 and a display module DM.

The display module DM constitutes a part of the display device DD, and in particular, an image may be generated by the display module DM. The display module DM may include the display panel 200 .

The display panel DP according to an exemplary embodiment may be a light emitting display panel, and is not particularly limited. For example, the display panel DP may be an organic light emitting display panel or a quantum dot light emitting display panel. The emission layer of the organic light emitting display panel may include an organic light emitting material. The emission layer of the quantum dot light emitting display panel may include quantum dots, quantum rods, and the like. Hereinafter, the display panel DP will be described as an organic light emitting display panel.

The display panel DP may be a flexible display panel. Accordingly, the display panel DP may be completely rolled or folded or unfolded about the folding axes FX1 and FX2. The present invention is not limited thereto, and may be folded or unfolded about the second folding axis FX2 (see FIG. 3A ).

Although not shown, the display module DM may further include an input sensor on the display panel 200 . The input sensor may be directly disposed on the display panel 200 . The display module DM may further include functional layers such as a protective panel and a cover panel.

As an example of the present invention, the functional layer may be an anti-reflection layer (POL) that blocks reflection of external light. The anti-reflection layer POL may prevent elements constituting the display module DM from being visually recognized from the outside by external light incident through the front surface of the display device DD. The anti-reflection layer POL may include a retarder and a polarizer. The phase retarder may be a film type or liquid crystal coating type, and may include a λ/2 phase delay and/or a λ/4 phase delay. The polarizer may also be a film type or a liquid crystal coating type. The film type may include a stretched synthetic resin film, and the liquid crystal coating type may include liquid crystals arranged in a predetermined arrangement. The phase retarder and the polarizer may be implemented as one polarizing film.

The display module DM may display an image according to an electrical signal and transmit/receive information about an external input. In the display module DM, an active area corresponding to the display area DA (refer to FIG. 1 ) and a peripheral area corresponding to the non-display area NDA (refer to FIG. 1 ) may be defined. The active area may be an area for emitting an image provided by the display module DM.

The display device DD may include the window 100 disposed on the display module DM. The window 100 may include a protection member 110 and a window member 120 .

The protective member 110 may correspond to a protective film disposed on the window member 120 to protect the window member 120 from external impact.

The protection member 110 may be a layer for improving the impact resistance of the window 100 and preventing scattering when damaged. The protective member 110 may include at least one selected from a urethane-based resin, an epoxy-based resin, a polyester-based resin, a polyether-based resin, an acrylate-based resin, an ABS resin (acrylonitrile-butadiene-styrene resin), and rubber. .

For example, the protective member 110 may include phenylene, polyethyleneterephthalate (PET), polyimide (PI), polyamide (PAI), or polyethylene naphthalate (PEN). ) and may include at least one of polycarbonate (PC).

The window member 120 may include an optically transparent insulating material. Accordingly, the image generated by the display module DM may be easily recognized by the user through the window 100 .

In one embodiment, the window member 120 may include a thin glass or synthetic resin film. When the window member 120 includes thin glass, the thickness of the window member 120 may be 100 μm or less, for example, 30 μm, but the thickness of the window member 120 is not limited thereto. .

When the window member 120 includes a synthetic resin film, the window member 120 may include a polyimide (PI) film or a polyethylene terephthalate (PET) film.

The window member 120 may have a multi-layer structure or a single-layer structure. For example, the window member 120 may include a plurality of synthetic resin films bonded with an adhesive, or may include a glass substrate and a synthetic resin film bonded with an adhesive. The window member 120 may be made of a flexible material. Accordingly, the window member 120 may be folded or unfolded about the folding axes FX1 and FX2. That is, the shape of the window member 120 may be deformed together when the shape of the display module DM is deformed.

As such, the window 100 transmits an image from the display module DM and at the same time mitigates an external shock, thereby preventing the display module DM from being damaged or malfunctioning due to an external shock. The external impact is a force from the outside that can be expressed as pressure, stress, or the like, and means a force that causes a defect in the display module DM.

The display device DD may include a plurality of adhesive members AD1 and AD2. The adhesive members AD1 and AD2 may include a pressure sensitive adhesive (PSA), an optical clear adhesive (OCA), or an optical clear resin (OCR). The adhesive members AD1 and AD2 may be heat-responsive adhesive members whose adhesive strength is changed in response to heat. Each of the adhesive members AD1 and AD2 may have different thicknesses. The protection member 100 and the window member 120 may be adhered to each other by the first adhesive member AD1 . The window 100 and the display module DM may be adhered to each other by the second adhesive member AD2 . In an embodiment, the adhesive members AD1 and AD2 may be omitted. A detailed description of the adhesive member will be described later.

5A to 5E are views illustrating a method of manufacturing a window according to an embodiment of the present invention.

5A is a cross-sectional view illustrating the preliminary window 100 - 1 . The preliminary window 100 - 1 may include a first protection member 110 - 1 and a window member 120 . The preliminary window 100 - 1 may include a plurality of release films 10 . The release films 10 are attached to upper and lower surfaces of the preliminary window 100 - 1 . The release films 10 are attached on the first protective member 110 - 1 and attached on the window member 120 . The release films 10 may protect the preliminary window 100 - 1 in the process of moving the preliminary window 100 - 1 .

In an embodiment, the first protection member 110 - 1 may be attached to the window member 120 in a first state. Here, the first state may include a plurality of states. For example, the first state may include a plurality of bad states. That is, the first state may correspond to an attachment state that does not satisfy a specific criterion for determining that the first protection member 110 - 1 is accurately attached to the window member 120 .

In the present embodiment, the spare window 100 - 1 may correspond to a bad window. That is, the preliminary window 100 - 1 may include the first protection member 110 - 1 erroneously attached to the window member 120 .

The preliminary window 100 - 1 may include a first adhesive member AD1 between the window member 120 and the first protection member 110 - 1 . The first adhesive member AD1 may be attached to the lower surface of the first protection member 110 - 1 to attach the first adhesive member AD1 to the upper surface of the window member 120 .

In an embodiment, the first adhesive member AD1 may lose adhesive strength at the first temperature as a heat-responsive adhesive member. For example, the first temperature may correspond to about 40 degrees to about 60 degrees. That is, the first adhesive member AD10 may be removed from the window member 120 at 40 degrees to 60 degrees.

The preliminary window 100 - 1 may include the same window member 120 as the window 100 (refer to FIG. 4 ) in addition to the first protection member 110 - 1 attached in the first state. That is, the window member 120 may include thin glass or polyimide.

5B is a view illustrating a step of attaching the adhesive tape AT to the window member 120 . The adhesive tape AT may be attached on the other surface (lower surface) that is opposite to the one surface (upper surface) of the window member 120 to which the first protective member 110 - 1 is attached. In one embodiment, the adhesive tape AT may be a heat-responsive adhesive tape. That is, the adhesive tape AT may lose adhesive strength in response to the second temperature. The second temperature may be higher than the first temperature. For example, the second temperature may be greater than or equal to about 75 degrees. The adhesive tape AT may lose its adhesive force at 75 degrees or more, and thus may be separated from the window member 120 .

The adhesive tape AT is attached to the window member 120 to fix the window member 120 while the window member 120 is then separated from the first protection member 110 - 1 . In addition, the adhesive tape AT may protect the window member 120 from damage such as cracks that may occur during the first step.

FIG. 5C shows a first separation step of separating the first protection member 110 - 1 from the window member 120 . The first protective member 110 - 1 is in a state in which it is adhered to the window member 120 by the first adhesive member AD1 . When the preliminary window 100 - 1 is heated to the first temperature, the first adhesive member AD1 may lose adhesive strength and the first protective member 110 - 1 may be separated from the window member 120 . For example, as shown in FIG. 5C , the window member 120 to which the first protection member 110-1 is attached is disposed on a heating stage HS-1 such as a heating plate, and the temperature is set to the first temperature. Corresponding to, for example, when set to 40 to 60 degrees, the first adhesive member AD1 may lose adhesive force and the first protective member 110 - 1 may be separated from the window member 120 . Thereafter, the first protection member 110 - 1 may be separated from the window member 120 . A method of heating to the first temperature is not limited to FIG. 5C .

FIG. 5D is a view illustrating a second separation step of separating the adhesive tape AT from the window member 120 . The adhesive tape AT may be separated after the first protective member 110 - 1 is separated.

The adhesive tape AT loses adhesive force due to a thermal reaction at the second temperature. The second temperature is higher than the first temperature. Accordingly, the adhesive tape AT may maintain adhesive strength in the step of FIG. 5C in which the first protective member 110 - 1 is separated.

In one embodiment, when the other surface, which is the opposite surface of one surface of the window member 120 to which the adhesive tape AT is attached, is placed on the heating stage HS-2 set to a second temperature of about 75 degrees or more and heated, the adhesive The tape AT may be separated from the window member 120 by losing adhesive force. The heating method is not limited to FIG. 5D.

5E shows the step of attaching the second protective member 110 to the window member. 6 is a diagram illustrating a method of manufacturing a display device according to an exemplary embodiment.

The window member 120 separated from the first protection member 110 - 1 is attached to the second protection member 110 . That is, when the first protective member 110 - 1 attached to the first state, which is in a defective state, is removed, the window member 120 may be coupled to the second protective member 110 in the second state, which is a normal state. .

In an embodiment, the window member 120 may be separated from the first protection member 110 - 1 and washed before being attached to the second protection member 110 . The washing method is not particularly limited.

The second protection member 110 is provided as a new protection member different from the first protection member 110 - 1 . The second protective member 110 may be provided with a release film 10 attached to one surface and a first adhesive member AD1 attached to the other surface. The second protection member 110 is attached to the window member 120 by the first adhesive member AD1 in a second state.

In an embodiment, after the second protection member 110 and the window member 120 are attached, it may be checked whether the attachment state corresponds to the second state. When the attachment state of the second protection member 110 and the window member 120 is determined to be the second state, the window 100 (refer to FIG. 4 ) is generated. In FIG. 6 , a window 100 (refer to FIG. 4 ) may be provided on the display panel 200 (refer to FIG. 4 ) and attached to the display panel 200 (refer to FIG. 4 ). However, when the attachment state of the second protective member 110 and the window member 120 is determined to be the first state instead of the second state, the second protective member 110 is separated from the window member 120 and another protective member (not shown) may be performed again in the first separation step to the second separation step in order to reattach.

7A and 7B are flowcharts illustrating a method of manufacturing a display device according to an exemplary embodiment.

7A is a flowchart schematically illustrating a method of manufacturing a display device, and FIG. 7B is a flowchart specifically illustrating a method of manufacturing a window.

7A , a method of manufacturing a display device may include a method of manufacturing a window according to an exemplary embodiment. The display device manufacturing method includes sequentially providing a preliminary window ( S100 ), removing the first protection member ( S200 ), attaching the second protection member ( S300 ), acquiring a window ( S400 ), and attaching the window to the display panel ( S500 ). ) is included.

The preliminary window may correspond to a defective product having a defective coupling between the protection member and the window member. An embodiment of the present invention may separate the poorly coupled protection member from the window member. In this process, the first protective member removing step S200 may include a first separating step of attaching an adhesive tape to the window member and heating to a first temperature, and a second separating step of heating to a second temperature. It will be described in detail with reference to FIG. 7B.

Then, the second protective member is attached. Unlike the first protection member, the second protection member may be normally attached to the window member. When the second protective member is normally attached, the window can be obtained. The window may be attached to the display panel to create a display device.

In FIG. 7B , a preliminary window may be provided (step S110 ). The preliminary window includes a window member, a first protective member attached to one surface, and an adhesive member disposed between the window member and the first protective member, and the adhesive member may lose adhesive force at a first temperature of 40 to 60 degrees.

An adhesive tape may be attached to one surface of the window member of the preliminary window (step S210). In one embodiment, the adhesive tape may lose adhesive strength at a second temperature of about 75 degrees or more.

The first protective member may be separated by heating the preliminary window to a first temperature (step S310). The heating method is not particularly limited.

Thereafter, the preliminary window may be heated to a second temperature to separate the adhesive tape (step S410). The heating method is not particularly limited.

The window member from which the first protective member and the adhesive tape are removed may be washed (step S510).

After cleaning the window member, a second protection member may be attached (step S610). The second protection member may be attached to the window member in a second state, which is a normal state, unlike the first protection member. A window may be formed when the protective member is attached in a normal state.

8 is a graph showing a change in adhesive strength of an adhesive member and an adhesive tape according to temperature.

In FIG. 8 , the x-axis represents the heating temperature, and the y-axis represents the adhesive force of the pressure-sensitive adhesive member or the pressure-sensitive adhesive tape. It can be seen that the adhesive strength gradually decreases as the temperature increases.

A shows the change in the adhesive force of the first adhesive member (AD1, see FIG. 5A ) according to the temperature, and B shows the change in the adhesive force of the adhesive tape (AT, see FIG. 5B ) according to the temperature.

In FIG. 8 , referring to graph A, the adhesive force of the first adhesive member AD1 is 276 gf/in (hereinafter, unit omitted) at about 25 degrees, 213 at about 40 degrees, and 119 at about 50 degrees. The first adhesive member AD1 may be first separated at about 50 degrees. That is, the first adhesive member AD1 may be sufficiently separated from the window member 120 (refer to FIG. 5C ) with an adhesive force of 119 at a temperature of about 50 degrees.

Referring to the graph B, the adhesive force of the adhesive tape AT is 1900 at about 25 degrees, 612 at about 40 degrees, and 475 at about 50 degrees. That is, in the first separation step of about 50 degrees in which the first adhesive member AD1 is separated, the adhesive tape AT has an adhesive strength of 475 and is not separated. The adhesive strength of the adhesive tape AT has an adhesive strength of 50 at about 85 degrees thereafter. The adhesive tape AT may have an adhesive force of 100 or less from about 70 degrees or more and may be separated from the window member 120 (refer to FIG. 5D ). In FIG. 8 , the adhesive tape AT may be secondarily separated from the window member 120 at a temperature of about 85°C.

As described above, the embodiments have been disclosed in the drawings and the specification. Although specific terms are used herein, they are used only for the purpose of describing the present invention, and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

DD: display device
100: window
100-1: spare window
110-1: first protective member
110: second protection member
120: no window
AD1: first adhesive member
AT: adhesive tape

Claims (20)

A window member, a first protection member attached to the window member in a first state, and an adhesive member disposed between the window member and the first protection member to attach the first protection member to the window member providing a preliminary window;
a first separation step of separating the window member and the first protection member; and
a bonding step of attaching a second protection member on the separated window member in a second state,
The adhesive member is removed from the adhesive force at a first temperature,
The first separating step includes heating the preliminary window to the first temperature. The method of claim 1 , wherein the window member comprises thin glass. The method of claim 1 , wherein the window member comprises polyimide (PI). The method of claim 1 , wherein the first temperature is between 40 degrees and 60 degrees. The method of claim 1, further comprising, between the step of providing the preliminary window and the step of separating the first, attaching an adhesive tape on a surface opposite to the one surface of the window member to which the first protection member is attached, ,
The adhesive tape is a window manufacturing method comprising a thermally reactive tape in which the adhesive force is removed at a second temperature. 6. The method of claim 5, wherein the second temperature is greater than or equal to 75 degrees. 6. The method of claim 5, further comprising a second separating step of separating the adhesive tape from the window member between the first separating step and the bonding step. 8. The method of claim 7, wherein the second separating step comprises heating the adhesive tape to the second temperature. The method of claim 7, further comprising a cleaning step of cleaning the window member after the second separation step. The method of claim 1 , wherein the bonding step includes attaching the second protective member on the window member through an adhesive member that loses adhesive force at the first temperature. 6. The method of claim 5, wherein the first temperature is less than the second temperature. The method of claim 1 , wherein a plurality of the first states are provided, each different from each other, and the plurality of first states and the second state are different from each other. providing a display panel;
providing a window including a window member and a protection member disposed on the window member on the display panel; and
attaching the window to the display panel;
The step of providing the window includes forming the window, and the step of forming the window includes:
a first protective member attached to the window member in a first state on the window member; and an adhesive member disposed between the window member and the first protective member to attach the first protective member to the window member. providing a preliminary window to
a first separation step of separating the window member and the first protection member; and
a bonding step of attaching a second protection member on the separated window member in a second state,
The adhesive member is removed from the adhesive force at a first temperature,
The first separating may include heating the preliminary window to the first temperature. The method of claim 13 , wherein the window member comprises thin glass. The method of claim 13 , wherein the first temperature is 40°C to 60°C. 14. The method of claim 13, further comprising, between the step of providing the preliminary window and the step of separating the first, the step of attaching an adhesive tape on a surface opposite to the one surface of the window member to which the first protection member is attached, ,
The method of claim 1 , wherein the adhesive tape includes a thermally reactive tape from which adhesive force is removed at a second temperature. The method of claim 16 , wherein the second temperature is 75 degrees or more. The method of claim 16 , further comprising a second separating step of separating the adhesive tape from the window member between the first separating step and the bonding step. The method of claim 18 , wherein the second separating comprises heating the adhesive tape to the second temperature. The method of claim 16 , wherein the first temperature is lower than the second temperature.

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