KR101675225B1 - Apparatus of display having detachable layer and method of manufacturing the display - Google Patents

Abstract

A display device having a removable layer capable of designing a display device with a simple process, a low manufacturing cost, and various designs, and a method of manufacturing the same. The apparatus and method include a window structure having a removable layer having an adhesive force of 0.1 gf / 25 mm to 500 gf / 25 mm formed on a front surface of a touch screen integrated with a window, and a display on which a removable layer of the window structure is detachably attached and detached, An adhesion reducing layer is disposed to reduce adhesion to the layer, and the release film is removed to expose the release layer and then adhere to the display.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a removable layer and a method of manufacturing the same,

The present invention relates to a display device and a method of manufacturing the same, and more particularly, to a display device for detachably attaching a window structure including a touch screen to a display, and a method of manufacturing the display device by detachment thereof.

A display such as a liquid crystal display (LCD), an organic light emitting diode (OLED), and an electrophoretic display (EPD) forms a screen. Such a display device is applied to various image display devices. On the other hand, the apparatus employs a touch screen to provide ease of operation. A window made of tempered glass or transparent polymer resin is arranged on the front surface of the touch screen. The window sharpens the image quality and protects the display device from external impact or damage by contact. The window is fixed to the touch screen with a transparent adhesive (OCA) or an ultraviolet curing adhesive. In recent years, the emergence of flexible and curved displays has led to the emergence of touch screens.

FIG. 1 and FIG. 2 are cross-sectional views schematically showing representative examples of a conventional display device to which a touch screen is applied. At this time, the display device includes not only the flat display but also the curved device.

1 and 2, a conventional display device has a structure in which a touch screen 2 and a window 3 are sequentially stacked on a display 1 such as an LCD or an OLED. The adhesive layer 4 may be formed between the display 1 and the touch screen 2 and between the touch screen 2 and the window 3 (Fig. 1). Also, the adhesive layer 4 can adhere the display 1 and the touch screen 2 as shown in FIG. The display device of FIG. 3 is formed with a conductive pattern (not shown) of the touch screen 2 under the window 3. FIG. The conventional window 3 is of a high hardness and occupies a relatively large proportion in the display in terms of price.

The manufacture of conventional display devices requires bubble-free assembly. Without bubbles, the refractive index and the reflectance are minimized, and the brightness of the display device is improved. However, due to the adhesive layer 4, the process for removing such bubbles is very complicated. Specifically, a coating film of the adhesive layer 4 is uniformly and minutely spaced by a spraying method, and bubbles are removed by close contact and reduced pressure. Then, it is cured by ultraviolet curing or the like. Since the coating film of the adhesive layer 4 should be free from air bubbles, it should be very precise. As a result, manufacturing of a conventional display device requires relatively expensive manufacturing equipment and a high unit price. Moreover, the conventional display device has a high defect rate because it is often not properly adhered without bubbles.

Further, the conventional display device can not satisfy the desire of the consumer who desires to have a variety of designs such as shape, color, pattern and the like. The diversity of products, the complex manufacturing process and the high cost are obstacles to meeting the needs of the consumers. In addition, if the design is diversified, the manufacturer of the display device has to perform service afterwards in response to the design. Accordingly, the window structure is conventionally designed with a single color such as black or white.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device having a removable layer which is simple in manufacturing a display device, has a low manufacturing cost, and can be designed in various ways, and a manufacturing method thereof.

A display device having a removable layer for solving the problems of the present invention includes a window structure in which a removable layer having an adhesive force of 0.1 gf / 25 mm to 500 gf / 25 mm is formed on a front surface of a touch screen integrated with a window, As shown in Fig. In addition, an adhesion reducing layer may be disposed on the display to reduce the adhesive force with the removable layer.

In the apparatus of the present invention, the window may be either a glass substrate or a plastic substrate. The window may be a tempered glass substrate or a glass substrate made of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyimide, polyarylate, polycarbonate, polymethyl methacrylate (PMMA) And a plastic substrate including at least one of the above-mentioned plastic substrates.

In the preferred apparatus of the present invention, the detachable layer may be any one selected from the group consisting of an acryl-based polymer, a silicone-based polymer, a urethane-based polymer, a pressure-sensitive adhesive mixed with a crosslinking agent in a UV-curable resin, or a mixture thereof or a copolymer thereof. The detachable layer may be a single layer or a multi-layered layer made of different materials.

In the apparatus of the present invention, the adhesion reduction layer may be coated with a fluororesin or a silicone resin. The window structure may be designed in various shapes, colors, and patterns.

A method of manufacturing a display device having a removable layer according to another aspect of the present invention includes the steps of: forming a releasable film on a window structure having a removable layer having an adhesive force of 0.5 gf / 25 mm to 500 gf / 25 mm formed on a front surface of a touch screen integrated with a window; And the removable layer is exposed. The exposed release layer is then deposited on the display.

In the method of the present invention, prior to the step of preparing the window structure, the method may further comprise separating the damaged window structure attached to the display. An adhesion reducing layer may be formed on the display, wherein the adhesion removing layer is detachably attached to the adhesion reducing layer. The attachment of the window structure can be performed manually. The window structure may be attached without bubbles.

According to the display device having the detachable layer of the present invention and the method of manufacturing the same, the process of manufacturing the display device is simple, the manufacturing cost is low, and various designs are designed to meet the needs of the consumers by detaching and attaching the window structure including the touch screen . Furthermore, since the window structure is easily replaced with a removable one, it can be handled as a one-time consumable, not a necessity fixed to the display device.

1 is a cross-sectional view schematically showing one example of a conventional display device to which a touch screen is applied.
2 is a cross-sectional view schematically showing other examples of a conventional display device to which a touch screen is applied.
3 is a cross-sectional view illustrating a first display device having a removable layer according to the present invention.
4 is a cross-sectional view illustrating a second display device having a removable layer according to the present invention.
5 is a cross-sectional view illustrating a third display device having a removable layer according to the present invention.
6 is a schematic view showing the appearance of a display device having a detachable layer according to the present invention.

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

The embodiment of the present invention can be applied to a display by applying a window structure formed with a removable layer having an adhesive force of 0.1 gf / 25 mm to 500 gf / 25 mm to a display, thereby simplifying a process for manufacturing a display device, a display device having a low manufacturing cost, . At this time, the window structure is formed with a removable layer detachably attached to the display. Therefore, a device to be attached and detached can be referred to as a display. The detachable layer of the present invention is limited to being detached and attached to the display, and is clearly distinguished from a window protective film detached and attached to an existing window.

The display device according to the embodiment of the present invention refers to all image processing devices such as a mobile device, an information processing terminal, and a television. The mobile device includes a mobile phone, a smart phone, a tablet, and the like. The information processing terminal includes an ATM, a kiosk, and the like. The display device may be flat or curved, and may be flexible. The image processing apparatus includes a window, a touch screen, and a display. Accordingly, the window generally refers to a window of a mobile device, a window of an information processing terminal, or a window of all image processing devices such as a television. Similarly, the touch screen and the display also refer to a touch screen and a display that are applied to all image processing apparatuses.

In the embodiment of the present invention, the adhesive strength of the detachable layer is suitably about 0.1 gf / 25 mm to 500 gf / 25 mm, more preferably 0.2 gf / 25 mm to 50 gf / 25 mm. This is smaller than the conventional adhesive force of 1,500 gf / 25 mm of the conventional adhesive layer, and thus is distinguished from the conventional adhesive layer. Here, the adhesive layer of the present invention is optically transparent, and is applied with an adhesive which is cured by heat treatment or UV (ultraviolet ray). The adhesive is cured to a semi-solid state by heat treatment or UV treatment at a predetermined temperature and time. The adhesive method can be easily hand-woven by the user without air bubbles.

The above-mentioned releasable layer may be variously used within the technical idea of the present invention, but it is preferable to use an acrylic polymer, a silicone polymer, a urethane polymer, an adhesive mixed with a UV curing resin and a crosslinking agent, or a mixture thereof or a copolymer thereof. In some cases, a functional material such as silica gel, nanoparticles, and an antistatic agent may be mixed with the detachable layer to improve the physical properties of the detachable layer. Furthermore, the optical characteristics can be improved by adding particles forming a quantum dot to the removable layer.

The window structure is a window structure that is detachably attached to the display. Embodiments of the present invention provide examples of display devices to which the window structure is applied, but may be applied to other types of display devices within the scope of the present invention. The window structures of the present invention are separately manufactured and detached and attached to the display. Attachment of the window structure is possible by hand.

3 is a cross-sectional view illustrating a first display device 100 including a detachable first window structure 60 according to an embodiment of the present invention. However, it is not intended to express a cross-section in the strict sense, and for the convenience of explanation, there may be a component that may not appear on the cross-section.

3, the first display device 100 includes a display 10, a first detachable layer 40, a touch screen 20, an adhesive layer 50, and a window 30 sequentially stacked. At this time, the window 30, the adhesive layer 50, the touch screen 20, and the first detachable layer 40 form the first window structure 60. The display 10 includes a liquid crystal display (LCD), an organic light emitting diode (OLED), and an electrophoretic display (EPD), and also utilizes quantum dots. As the adhesive layer 50, for example, a thermosetting adhesive or an ultraviolet curable adhesive may be used. However, the present invention is not limited to this, and an OCA tape or the like can be used. The touch screen 20 has a conductive pattern formed on one side or both sides of an insulating layer made of metal oxide or plastic. Metal oxide is mainly used for the conductive pattern, and metal oxides include ITO, ATO, ZnO, Cu, conductive polymer, or silver nanowire.

The window 30 can be used without restriction as long as it is made of a transparent material. For example, a glass substrate or a plastic substrate. Specifically, the glass substrate may be tempered glass, and the plastic substrate may be made of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyimide (PI), polyarylate polymethyl methacrylate), or COC (cycloolefin copolymer).

The window 30 may have a print layer that is transparent or exhibits various functions. The print layer may be formed of any one or more of transparent, translucent, and / or color. The printing layer may be formed using inkjet printing or transfer using inkjet printing using silk printing or UV or thermal curing. On the window 30, a functional coating layer such as an inner fingerprint coating or an antimicrobial coating or a scratch-resistant coating may be formed. The functional coating layer may be formed by dry coating such as wet coating and vapor deposition to apply the coating liquid. In addition, the glass substrate of the window 30 or the bottom of the plastic substrate may be provided with characteristics such as shielding, reflection prevention, blue light shielding, electromagnetic wave shielding, and privacy. In addition, the window 30 may have an opening for exposing buttons, a camera, a speaker, and the like.

The first window structure 60 is detachably attached to the display 10 by a first detachable layer 40. The first release layer 40 can be detached and attached to the display 10 with the release film removed. As such, the first detachable layer 40 refers to being adhered to the display 10. The first detachable layer 40 may be any transparent material, but may be an acryl-based polymer, a silicone-based polymer, a urethane-based polymer, a pressure-sensitive adhesive mixed with a crosslinking agent in a UV-curable resin, or a mixture thereof or a copolymer thereof. The first detachable layer 40 may be a single layer or may be a multilayer of different materials for each layer. Depending on the environment in which the first detachable layer 40 of the present invention is used, the multi-layer can appropriately select materials constituting each layer. The thickness of the first detachable layer 40 may be as long as adhesion is sufficient, and preferably 10 to 200 mu m. It will be appreciated that the thickness can be obtained through repeated experiments by those of ordinary skill in the art.

On the other hand, in order to facilitate detachment and attachment of the first window structure 60, an adhesion reduction layer 70 may be added on the display 10. The adhesion reducing layer 70 increases the slip property by increasing the contact angle. The adhesion reducing layer 70 allows the first window structure 60 to be easily detached and attached from the touch screen 20. The adhesion reducing layer 70 may be formed of a coating material of a fluorine resin or a silicone resin. The adhesion reducing layer 70 may be formed by depositing TiO ₂ or silica (SiO ₂ ) on the window 30 and then coating a fluororesin or a silicone resin on the deposited window 30. At this time, the fluororesin or silicone resin can be formed by an ECC (Easy Cleaning Coating) method. By applying the adhesion reducing layer 70, it is possible to more effectively inhibit the generation of bubbles when the window 30 is attached when attached. In addition, the adhesion reducing layer 70 allows the consumer to easily attach and detach the first window structure 60 himself / herself without a separate tool.

In the case where the adhesive force of the first detachable layer 40 is about 0.1 gf / 25 mm to 500 gf / 25 mm, the detachable layer 40 has a self-adhesive force. The self-adhesive force is a property of attaching and detaching the removable layer 40 itself without bubbling even if the first detachable layer 40 is placed on the touch screen 20 alone. On the other hand, when the adhesion reduction layer 70 is applied to the touch screen 20, the adhesion reduction layer 70 has an improved magnetic adhesion strength than when the adhesion reduction layer 70 is absent.

The adhesive force according to the embodiment of the present invention may vary depending on the presence of the adhesion reducing layer 70. When the adhesion reducing layer 70 is present, the adhesive force is 0.5 gf / 25 mm to 500 gf / 25 mm. If there is no adhesion reducing layer 70, the adhesion is from 0.1 gf / 25 mm to 200 gf / 25 mm. When there is the adhesion-reducing layer 40 of the same material and thickness, it is easy to adhere the first window structure 60 without bubbles when the adhesion-reducing layer 70 is present. Also, due to the adhesion reducing layer 70, the separation of the first window structure 60 is relatively easy.

The first window structure 60 of the present invention is separately fabricated and protected by a release film. In order to attach the first window structure 60 to the display 10, the release film is removed. When the release film is removed, the first release layer 40 is exposed. When the first window structure 60 in which the first detachable layer 40 is exposed is manually attached to the display 10, the display on which the window 30 is mounted can be completed. Accordingly, unlike the prior art, a precise bonding process is not required. In addition, to break or replace the first window structure 10, the first window structure 60 may be manually removed and a new first window structure 60 may be attached.

4 is a cross-sectional view illustrating a second display device 200 including a detachable second window structure 62 according to an embodiment of the present invention. However, it is not intended to express a cross-section in the strict sense, and for the convenience of explanation, there may be a component that may not appear on the cross-section. The second display device 200 is the same as the first display device 100 except that the adhesive layer 50 is replaced with a second detachable layer 42. In the following description, duplicate descriptions will be omitted or briefly explained.

4, the display 10, the first detachable layer 40, the touch screen 20, the second detachable layer 42, and the window 30 are sequentially stacked on the second display device 200 . At this time, the window 30, the second detachable layer 42, the touch screen 20, and the first detachable layer 40 form the second window structure 62. The second window structure 62 is detachably attached to the display 10 by the first detachable layer 40. The first release layer 40 may be attached to the display 10 with the release film removed. In addition, the second window structure 62 can be attached to and detached from the touch screen 20 by the second detachable layer 42. In other words, the second window structure 62 has a first detachable layer 40 and a second detachable layer 42 that can be detachably attached to the display 10 and the touch screen 20, respectively.

The first and second detachable layers 40 and 42 may be made of a transparent material, but may be an acrylic polymer, a silicone polymer, a urethane polymer, a pressure sensitive adhesive mixed with a crosslinking agent in a UV curable resin, or a mixture thereof or a copolymer thereof. The first and second detachable layers 40 and 42 may each be a single layer or may be a multi-layer or a single layer of different materials for each layer. According to the environment in which the first and second detachable layers 40 and 42 of the present invention are used, the multi-layer can appropriately select materials constituting each layer. The thickness of each of the first and second detachable layers 40 and 42 may be as long as the adhesion is sufficient, and is preferably 10 to 200 mu m. It will be appreciated that the thickness can be obtained through repeated experiments by those of ordinary skill in the art.

Although not shown in the drawings, the window 30 of the first and second window structures 60 and 62 and the second detachable layer 42, or between the touch screen 20 and the first detachable layer 42, 40). The additional function may be added to any one or both of the functions. The additional element may include a transparent adhesive layer (OCA), a scattering-preventive layer, etc., and if necessary, a printing layer and a functional coating layer may be appropriately formed. For example, a first adhesive layer 40 may be formed on the transparent synthetic resin film after a transparent adhesive layer including a printing layer is formed on the touch screen 20 and a transparent synthetic resin film (e.g., PET film) have. These additional elements are already well known, so a detailed description thereof will be omitted.

5 is a cross-sectional view illustrating a third display device 300 including a detachable third window structure 64 according to an embodiment of the present invention. However, it is not intended to express a cross-section in the strict sense, and for the convenience of explanation, there may be a component that may not appear on the cross-section. At this time, the third display device 300 is the same as the first display device 100 except that the adhesive layer 50 is not provided. Accordingly, detailed description of the same reference numerals will be omitted. At this time, the third window structure 64 may further include an additional element as shown in the first window structure 60.

Referring to FIG. 5, the third display device 300 includes a display 10, a first removable layer 40, a touch screen 20, and a window 30. At this time, the window 30, the touch screen 20, and the first detachable layer 40 form the third window structure 64. Here, the touch screen 20 is formed with a conductive pattern directly below the window 30. That is, the touch screen 20 is formed in addition to the conductive pattern formed on the window 30. The first detachable layer 40 may be any transparent material, but may be an acryl-based polymer, a silicone-based polymer, a urethane-based polymer, a pressure-sensitive adhesive mixed with a crosslinking agent in a UV-curable resin, or a mixture thereof or a copolymer thereof. The first detachable layer 40 may be a single layer or may be a multilayer of different materials for each layer. Depending on the environment in which the first detachable layer 40 of the present invention is used, the multi-layer can appropriately select materials constituting each layer. The thickness of the first detachable layer 40 may be as long as adhesion is sufficient, and preferably from 10 탆 to 200 탆. It will be appreciated that the thickness can be obtained through repeated experiments by those of ordinary skill in the art.

The third display device 300, like the first display device 100, may include an adhesion reducing layer 70. The materials and functions of the adhesion reducing layer 70 are the same as those described in the first display device 100. The adhesive force according to the embodiment of the present invention may vary depending on the presence of the adhesion reducing layer 70. When the adhesion reducing layer 70 is present, the adhesive force is 0.5 gf / 25 mm to 500 gf / 25 mm. When the adhesion reducing layer 70 is absent, the adhesion force is 0.1 gf / 25 mm to 200 gf / 25 mm. When there is the adhesion-reducing layer 70 of the same material and thickness, it is easy to adhere the second window structure 80 without bubbles. Also, due to the adhesion reducing layer 70, the separation of the second window structure 80 is relatively easy.

In the case where the adhesive force of the first detachable layer 40 is about 0.1 gf / 25 mm to 500 gf / 25 mm, the detachable layer 40 has a self-adhesive force. The magnetic adhesive force is a property that the first detachable layer 40 adheres to itself without bubbles even if the detachable layer 40 is placed on the touch screen cover layer 22 alone. On the other hand, application of the adhesion reducing layer 70 to the touch screen cover layer 22 has more improved magnetic adhesion than when the adhesion reducing layer 70 is absent.

When the first to third window structures 60, 62, and 64 are applied, a ground portion may be formed so as to face each other in predetermined areas of the display 10 and the touch screen 20, respectively. For the ground, a portion of the first removable layer 40 of the touch screen 20 may be removed. When the first to third window structures 60, 62, 64 are attached to the display 10, the ground portions are connected to each other. In this case, the grounding of the first to third display devices 100, 200 and 300 can be realized.

The display devices according to the embodiment of the present invention are replaced when the window structure is broken and selected and attached to the new window structure. Specifically, it is replaced when the broken window structure is detached and a new window structure is attached. The replacement process of the window structure can be carried out directly by the customer, and the replacement time is very short. In addition, since only the window structure is removed, the display device can be easily recycled. Further, since the window structure is detachably attached by adhesion, it can be easily attached without bubbles. Since the manufacturer needs only to manufacture the part other than the window structure and does not need to perform the bonding step, the manufacturing process is simplified.

6 is a view schematically showing an appearance of a display device including a detachable window according to an embodiment of the present invention. At this time, the display device is merely an example of a mobile device, and other forms can be applied within the scope of the technical idea of the present invention, including those described above.

As shown, the display device of the present invention can be designed variously in appearance. The display device of the present invention can be designed in a beautiful shape, various colors and patterns. This is because, by separating the original window structure and attaching a new structure, you can change the appearance of the window structure to the desired design. Conventionally, in order to change the design, the adhesion of the window structure must be dismantled and the new window structure must be adhered again. However, the display device of the present invention changes design when a conventional window structure is detached and a new window structure is attached. Accordingly, the window structure of the present invention is not a necessity fixed to the display device, unlike the prior art, and can be treated as a consumable item which can be detached and attached as needed. In this way, if the design is diversified, the manufacturer of the display device does not have to provide service afterwards in response to the design.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. It is possible. For example, a separate means such as a groove or the like can be provided on the injection molding of the display device so that the window structure can be easily attached and detached.

10; Display 20; touch screen
30; Windows 40, 42; The first and second removable layers
50; Adhesive layer
60, 62, 64; The first to third window structures

Claims (13)

A window structure having an adhesive force of 0.1 gf / 25 mm to 500 gf / 25 mm on the front surface of the touch screen integrated with the window and having a removable layer having a detachable function for attaching and detaching; And
Wherein the removable layer of the window structure is removably attached to the window structure,
Wherein the adhesion-reducing layer is disposed on the display, the adhesion-reducing layer being formed on a front surface of the touch screen integrated with the window to reduce adherence between the removable layer and the display, thereby facilitating attachment and detachment of the detachable layer. / RTI > The display device according to claim 1, wherein the window is one of a glass substrate and a plastic substrate. The method as claimed in claim 1, wherein the window is formed of a tempered glass substrate or a glass substrate made of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyimide (PI), polyarylate (PAR), polycarbonate ) Or COC (cycloolefin copolymer). The display device according to claim 1, The display device according to claim 1, wherein the detachable layer is any one selected from the group consisting of an acrylic polymer, a silicone polymer, a urethane polymer, a pressure sensitive adhesive mixed with a crosslinking agent in a UV curable resin, . The display device of claim 1, wherein the detachable layer is a single layer or a multi-layered layer made of different materials. The display device according to claim 1, wherein the window structure is designed in various shapes, colors, and patterns. delete The display device according to claim 1, wherein the adhesion reducing layer is coated with a fluororesin or a silicone resin. Removing the release film in a window structure having an adhesive force of 0.1 gf / 25 mm to 500 gf / 25 mm on the front surface of the touch screen integrated with the window and having a removable layer having a detachable function for attaching and detaching, thereby exposing the detachable layer; And
And attaching the exposed release layer on a display,
Wherein the adhesion-reducing layer is disposed on the display, the adhesion-reducing layer being formed on a front surface of the touch screen integrated with the window to reduce adherence between the removable layer and the display, thereby facilitating attachment and detachment of the detachable layer. Of the display device. 10. The method of claim 9, further comprising the step of separating a damaged window structure attached to the display prior to the step of preparing the window structure. delete 10. The method of claim 9, wherein the attachment of the window structure is performed manually. 10. The method of claim 9, wherein the window structure is attached without bubbles.

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