KR20190078226A - Flexible display device - Google Patents

Abstract

Embodiments of the present invention relate to a flexible display device. More specifically, the flexible display device comprises: cover glass; a cover adhesion member disposed under the cover glass; a display panel disposed under the cover adhesion member; and a back plate disposed under the display panel. In at least one bending area where the cover glass, cover adhesion member, display panel, and back plate may be bent, the cover adhesion member covers at least one side of the cover glass. According to embodiments of the present invention, the breakage of the cover glass in the bendable display device may be prevented.

Description

[0001] FLEXIBLE DISPLAY DEVICE [0002]

The present invention relates to a flexible display device.

2. Description of the Related Art [0002] There has been a growing demand for display devices for displaying images according to progressive technological developments. In recent years, a liquid crystal display (LCD), a plasma display panel (PDP) Various display devices such as an OLED (Organic Light Emitting Diode Display Device) are being utilized.

Such display devices are applied not only to mobile devices such as smart phones and tablet PCs but also to various fields such as TVs (Television), automobile displays, and wearable devices. In order to be applied to various fields, structural modification is required.

In recent years, there have been developed various types of display devices such as a bendable, foldable curved, rolled, and flexible display devices (hereinafter, referred to as ben double, foldable curved, rollerable, And a flexible display device, and the like). Such a display device may include a structure such as a cover window, a display panel, and a back plate. In order to implement the flexible display device, it is necessary to be able to bend or fold the structures constituting the display device.

Among the structures of the flexible display device, the cover glass may be made thin in thickness to facilitate bending. However, as the thickness of the cover glass becomes thinner, micro cracks tend to occur at the corner of the cover glass.

Specifically, when the cover glass is cut to a size required by the display apparatus, the possibility of occurrence of microcracks at the edges due to the thin thickness of the cover glass is increased.

When an external force is applied to a display device in order to apply a cover glass having a crack at an edge to a flexible display device and to change the shape of the display device, cracks spread from the micro cracks at the corner of the cover glass to the inside of the cover glass, May be damaged.

Further, in such a display device, an adhesive layer is used for bonding the cover glass and the display panel. A cover glass is attached to the upper surface of the adhesive layer, and a display panel is attached to the lower surface of the adhesive layer.

At this time, a foreign matter or the like may be attached to the side surface of the adhesive layer in a state in which the adhesive force remains on the side surface of the adhesive layer. Further, in the case where the adhesive layer material is a material having a very low cohesive force, the adhesive layer may be located in an undesired region where the adhesive layer flows.

In view of the foregoing, it is an object of embodiments of the present invention to provide a display device having a structure that can prevent breakage of a cover glass in a bendable display device.

It is another object of embodiments of the present invention to provide a display device having a structure capable of preventing foreign matters from adhering to a bonding member through control of physical properties of a cover bonding member disposed between a cover glass and a display panel.

It is still another object of embodiments of the present invention to provide a display device having a structure that can prevent the adhesive member from flowing in a non-adhesive portion of a cover adhesive member disposed between a cover glass and a display panel.

In one aspect, a display device according to embodiments of the present invention includes a cover glass, a cover adhesive member disposed under the cover glass, a display panel disposed under the cover adhesive member, and a back plate disposed under the display panel And at least one bending area in which the cover glass, the cover adhesive member, the display panel, and the back plate are bendable, the cover adhesive member covers at least one side of the cover glass.

In such a cover adhering member, the portions to be bonded to the side and bottom surfaces of the cover glass and the portions to be non-adhered to the side and bottom surfaces of the cover glass may have different physical properties.

The portion of the cover adhesive member adhered to the side surface and the bottom surface of the cover glass is cross-linked with the silica of the upper cover glass, and the portion of the cover adhesive member adhered to the upper surface of the display panel Silica or a polymer, and the top surface of the cover bonding member and the surface opposite to the surface to which the cover bonding member is adhered to the cover glass can be self-cross-linked.

Further, the display panel may include a display area and a non-display area, and the cover part of the cover adhesion member may be located at a position corresponding to the non-display area of the display panel.

In another aspect, in the display device according to the embodiments of the present invention, the display device includes at least one bending area, and includes a cover glass, a cover adhesive member disposed under the cover glass, And a back plate disposed at a lower portion of the display panel, wherein the bending area is located at a lower portion of the cover glass and is bonded to the lower surface of the cover glass and the upper surface of the display panel, And a cover portion adhered to and adhered to a side surface or an upper surface of the adhesive portion.

According to the embodiments of the present invention described above, it is possible to provide a display device having a structure that can prevent breakage of a cover glass in a bendable display device.

According to the embodiments of the present invention, it is possible to provide a display device having a structure capable of preventing foreign matters from adhering to the adhesive member through physical property control of the cover adhesive member disposed between the cover glass and the display panel.

According to the embodiments of the present invention, it is possible to provide a display device having a structure that can prevent the adhesive member from flowing in the non-adhesive portion of the cover adhesive member disposed between the cover glass and the display panel.

1 is a perspective view schematically showing a display device according to embodiments of the present invention.
2 is a plan view of a display device according to embodiments of the present invention.
3 is a perspective view of a display device according to embodiments of the present invention.
4 is a cross-sectional view taken along line AB of Fig.
5 is a view showing a state in which the cover bonding members of the display device according to the embodiments of the present invention are different in physical properties from each other.
6 to 8 are sectional views showing a display device according to another embodiment of the present invention.
9 is a plan view of a display device according to embodiments of the present invention having a plurality of bending regions.
10 is a perspective view of the display device of Fig.
11 is a plan view of a display device in which the entire area is a bending area.
12 is a perspective view of the display device of Fig.
13 is a plan view of a display device according to still another embodiment of the present invention.
14 is a view showing a configuration in which the display device according to the embodiments of the present invention includes a cover member.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components.

1 is a perspective view schematically showing a display device according to embodiments of the present invention.

Referring to FIG. 1, a display device 100 according to embodiments of the present invention may include at least one bending area BA. The non-bending regions NBA1 and NBA2 may be located on both sides of the bending region BA.

The display device 100 according to the embodiments of the present invention may be a display device 100 that can be stably driven even when bent by an external force. This display device 100 can be bent based on, for example, the bending reference line BL.

1, a display device 100 according to an exemplary embodiment of the present invention is a flexible display device 100 having flexible characteristics in a bending area BA. However, the present invention is not limited thereto. The display device 100 according to the embodiments may be various display devices 100 such as a foldable display device, a curved display device, a rollered display device and the like.

Bending the display device 100 according to the embodiments of the present invention may include both meaning that the display device 100 is bent or folded.

Meanwhile, the "bending area" described in the present specification may mean a region that differs from a state before bending processing by a bending process of a user or the like.

One or more of these bending regions may be present, and each bending state (e.g., bending curvature, bending surface state, etc.) may be the same or different if there are more than one bending region.

Further, the position of the bending region may be a fixed position in the flexible display device, or may vary depending on the bending processing position of the user or the like.

The size of the bending area may be always the same or may vary depending on the bending processing method of the user or the like.

On the other hand, the "non-bending region" may be a region that is not a bending region and may be an area that maintains a state prior to the bending process.

The number, position, size, and the like of the non-bending regions can be determined by the number, position, size, and the like of the bending regions as described above.

On the other hand, the bending shape may be generally a gentle curve shape, but may include a bent shape.

Although not shown separately, the display device 100 according to the present invention may be applied to various electronic devices such as a cellular phone, a personal computer, a notebook computer, a personal digital terminal, a car navigation unit, a game machine, a portable electronic device, A wristwatch-type electronic device, a small-sized electronic device such as a camera, and the like.

In addition, the display device 100 according to the embodiments of the present invention includes a plurality of regions that are distinguished on a display surface. The display apparatus 100 may be divided into a display area AA and a non-display area NA according to whether the corresponding area displays an image.

The display device 100 displays an image through the display area AA. The non-display area NA does not display an image. In the non-display area NA, a driver and / or wires for driving the display area AA may be disposed. The non-display area NA may surround the display area AA.

1, the display device 100 according to the exemplary embodiment of the present invention includes a first non-bending region NBA1 and a second non-bending region BA located on both sides of one bending region BA and the bending region BA, NBA2). However, the present invention is not limited to this, and a configuration in which the display device 100 includes at least one bending area BA is sufficient.

For convenience of explanation, in the following description, the display device 100 according to the embodiments of the present invention includes a bending area BA bent according to an applied external force, a first non-bending area NBA1 not bending, And a second non-bending area NBA2 will be mainly described.

2 is a plan view of a display device according to embodiments of the present invention.

2, a display device 100 according to embodiments of the present invention includes a cover glass 210 and a cover adhesive member 220 and a cover glass 210 And a display panel 200 positioned below the cover bonding member 220. [ That is, the cover glass 210 and the cover adhesive member 220 may be arranged to expose a part of the upper surface of the display panel 200 in a plan view.

Meanwhile, since the display device 100 according to the embodiments of the present invention is a display device 100 that can be bended, the components included in the display device 100 can also bend in the bending area BA. That is, the cover glass 210, the cover bonding member 220, and the display panel 200 can bend in the bending area BA.

Of these structures, the cover glass 210 may be made thin in thickness to facilitate bending. As the thickness of the cover glass 210 increases, the external force required to bend the cover glass 210 increases. As the external force applied to the cover glass 210 increases, the stress generated in the cover glass 210 Which means a force against the external force due to the force generated inside, is also increased, and the cover glass 210 may be damaged.

On the other hand, as the thickness of the cover glass 210 becomes thinner, microcracks tend to occur at the edges of the cover glass 210.

For example, when cutting the cover glass 210 to a size required by the display apparatus 100, it is possible to prevent micro-cracks at the edges due to the thin thickness of the cover glass 210 (for example, A chip, etc.) is generated.

When the cover glass 210 having cracks at the corners is applied to the bendable display device 100 and furthermore when the edge cracks are located in the bending area BA, Cracks may spread from inside the cover glass 210 to the inside of the cover glass 210, starting from microcracks at the corner of the glass 210.

Specifically, when an external force is applied to the display device 100 to bend the display device 100, the cover glass 210 is also bent in the bending area BA. In the cover glass 210, A stress which is a force opposite to an external force is generated.

When the stress generated in the cover glass 210 reaches the breaking critical point, the cover glass 210 begins to break, and the micro-cracks at the edge of the cover glass 210 have the effect of lowering the breaking critical point. Therefore, even if a small external force is applied to the cover glass 210, the cover glass 210 can be easily broken due to micro-cracks at the corner of the cover glass 210.

The display device 100 according to the embodiments of the present invention provides a structure that can prevent breakage of the cover glass 210 in the bending area BA.

Specifically, the cover bonding member 220 is disposed on at least one side of the cover glass 210 in the bending area BA of the display device 100. [

Here, the modulus of the cover adhesive member 220 may be lower than the modulus of the cover glass 210. Modulus is the modulus of elasticity, which is the ratio of stress to strain.

The cover adhesive member 220 serves to adjust the distribution of the stress generated in the cover glass 210 when the cover glass 210 is bent.

Here, the adjustment of the stress distribution means that the cover bonding member 220 is located on at least one side of the cover glass 210 in the bending area BA to reduce the magnitude of the stress generated in the cover glass 210.

Therefore, even if an external force is applied to the cover glass 210 such that a stress corresponding to or exceeding the breakage critical point in the bending area BA is generated, or microcracks are formed at the corner of the cover glass 210, The size of the stress generated in the cover glass 210 is reduced, so that the cover glass 210 can be prevented from being damaged.

3 is a perspective view of a display device according to embodiments of the present invention.

3, the display device 100 includes a cover glass 210, a cover bonding member 220, a display panel 200, an adhesive layer 340, and a back plate 350.

The cover glass 210 may be made of a transparent material and positioned on the display panel 200 to protect the display panel 200.

Further, the display panel 200 may be a liquid crystal display panel, an organic light emitting display panel, an electrophoretic display panel or the like, and the kind thereof is not limited in the present invention. The display panel 200 may include an upper substrate and a lower substrate.

The lower substrate and the upper substrate of the display panel 200 may be a thin glass substrate capable of bending or a polymer substrate. When the upper substrate and the lower substrate of the display panel 200 are polymer substrates, the substrate may be in the form of a film comprising one selected from the group consisting of a polyester-based polymer, a silicon-based polymer, an acrylic polymer, a polyolefin-based polymer, Lt; / RTI > Specifically, the substrate may be formed of at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polysilane, polysiloxane, polysilazane, polycarbosilane, polyacrylate, polymethacrylate, polymethylacrylate, polymethylmetacrylate, polyethylacrylate, polyethylmetacrylate, cyclic olefin copolymer, (CO), cyclic olefin polymer (COP), polyethylene (PE), polypropylene (PP), polyimide (PI), polymethylmethacrylate (PMMA), polystyrene (PS), polyacetal (PEEK), polyester sulfone (PES), polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polycarbonate (PC), polyvinylidene fluoride Fluoroalkyl polymer (PFA), styrene acrylonitrile polymer (SAN), and combinations thereof, but the present invention is not limited thereto.

The back plate 350 may be disposed under the display panel 200 such as a cover bottom and a back cover to protect or support the display panel 200.

The display device 100 according to the embodiments of the present invention can be bent so that the cover glass 210, the cover bonding member 220, the display panel 200, the adhesive layer 340, Bending is also possible in the bending area BA.

The cover adhesive member 220 covers at least one side of the cover glass 210 in the bending area BA.

Specifically, the cover adhesive member 220 is located on a part of the side surface and the bottom surface of the cover glass 210 in the bending area BA of the display device. 3, the cover bonding member 220 may not be located in the first non-bending region NBA1 and the second non-bending region NBA2.

The display panel 200 is positioned below the cover glass 210 and the cover adhesive member 220. A back plate 350 is disposed under the display panel 200 and the display panel 200 and the back plate 350 can be adhered to each other through an adhesive layer 340 positioned therebetween.

On the other hand, the cover adhesive member 220 is integrally formed with the adhesive portion 321 located at the lower portion of the cover adhesive member 220, and is integrally formed with the adhesive portion 321 and extends in the outward direction of the cover adhesive member 220 from the side of the adhesive portion 321 And a cover portion 322 formed on the base portion 322.

The adhesive portion 321 is located below the cover glass 210 and is smaller than the size of the display panel 200 and bonded to the lower surface of the cover glass 210 and the upper surface of the display panel 200. The cover portion 322 is located on the side surface of the cover glass 210 and adheres to the side surface of the cover glass 210 and adheres to the side surface of the adhesive portion 321 or to a portion of the upper surface.

The adhesive portion 321 is located between the cover glass 210 and the display panel 200 and serves to bond the cover glass portion 210 and the display panel 200. The cover portion 322 covers the side surface of the cover glass 210 in the bending area BA, do.

The adhesive portion 321 and the cover portion 322 may be transparent high molecular substances, but the present invention is not limited thereto.

On the other hand, the modulus of the cover glass 210 is higher than the modulus of the cover adhesive member 220, the modulus of the cover adhesive member 220 is lower than the modulus of the display panel 200, 340 and the modulus of the adhesive layer 340 is lower than the modulus of the back plate 350. [

The modulus of the cover glass 210, the display panel 200, and the back plate 350 may be higher than the modulus of the cover bonding member 220 and the adhesive layer 340. Therefore, the breaking point of the cover glass 210, the display panel 200, and the back plate 350 may be lower than the cover adhesion member 220 and the adhesive layer 340.

In the display device 100 of the present invention, a high modulus structure and a low structure are alternately arranged, so that when the display device 100 is bent, the cover glass 210, the display panel 200, and the back plate 350 can be controlled.

Specifically, the cover glass 210, the display panel 200, and the back plate 350 are formed to include a neutral surface having a zero stress with respect to bending, so that the cover glass 210, the display panel 200, ) Is prevented from being broken by an external force when bending.

The cover portion 322 of the cover adhering member 220 is also lower than the modulus of the cover glass 210 and the cover portion 322 is formed in the cover glass 210 when the cover glass 210 is bent, Reduce the amount of stress.

Next, the arrangement relationship of the cover glass 210, the cover adhesive member 220, and the display panel 200 will be specifically examined with reference to FIG.

4 is a cross-sectional view taken along line A-B in Fig.

4, the cover bonding member 220 includes a bonding portion 321 disposed at a lower portion of the cover glass 210, and a bonding portion 321 integrally formed with the bonding portion 321 and disposed on at least one side of the cover glass 210 and the bonding portion 321 As shown in FIG.

4, the cover 322 is positioned on both sides of the cover glass 210 and the adhesive portion 321. [

Here, the sum of the width W1 of the bonding portion 321 and the width W2 of the cover portion 322, that is, the width of the cover bonding member 220 may correspond to the width W3 of the display panel 200 have.

Here, the meaning of correspondence means the same or similar. The meaning of the same or similar can be a concept that includes the level at which the difference occurs within the tolerance range. At this time, the tolerance range may be approximately 2% to 3%.

The width W1 of the bonding portion 321, the width W1 of the cover portion 322, the width of the cover bonding member 220 and the width W3 of the display panel 200 are the same as the width May be a width based on a direction perpendicular to the height direction of the display device 100 when the display device 100 is cut along the line AB.

The relationship between the width W1 of the bonding portion 321, the width W1 of the cover portion 322 and the width W3 of the cover bonding member 220 and the display panel 200 is only one example , And the shape of the cover bonding member 220. [

The cover portion 322 of the cover adhesive member 220 may be located at a position corresponding to the non-display area NA of the display device 100. [ That is, it is possible to prevent the bezel area of the display device 100 from becoming large due to the cover part 322.

Here, the bezel area refers to all the elements other than the area where the screen is actually displayed when the display device 100 is viewed from the front.

On the other hand, the physical properties of the cover bonding member 220 may be different from each other in different areas, which will be described in detail with reference to FIG.

5 is a view showing a state in which the cover bonding members of the display device according to the embodiments of the present invention are different in physical properties from each other.

5, a portion of the cover bonding member 220 which is adhered to the side surface 511 and the bottom surface 512 of the cover glass 210 and the side surface 511 and the bottom surface 512 of the cover glass 210 The non-bonded portions (non-bonded portions) may have different physical properties.

For example, a portion of the cover bonding member 220 to be adhered to the side surface 511 and the bottom surface 512 of the cover glass 210 is an adhesive portion, and the side surface 511 and the bottom surface 512 may be a portion having no adhesive force.

Specifically, a portion of the cover bonding member 220 that is adhered to the side surface and the bottom surface of the cover glass 210 may be in a state in which the cover glass 210 is physically coupled to the side surface and the bottom surface. Here, the physically bonded state means a state in which the portion of the cover bonding member 220 adhered to the side surface and the bottom surface of the cover glass 210 is crosslinked with the silica of the cover glass 210.

The state in which the cover bonding member 220 is crosslinked with the cover glass 210 means that the polymer chains constituting the cover bonding member 220 and the polymer chains constituting the cover glass 210 are bound together it means.

In the cover bonding member 220, a portion of the cover bonding member 220 adhered to the upper surface of the display panel 200 may be in a state of being physically coupled to the upper surface of the display panel 200.

Specifically, the cover bonding member 220 may be physically combined with the upper substrate of the display panel 200. [ When the upper substrate is a glass substrate, the cover bonding member 220 may be in a state of being crosslinked with the silica of the upper substrate. When the upper substrate is a polymer substrate, the cover bonding member 220 may be crosslinked Lt; / RTI > For example, when the upper substrate is polyimide, the cover bonding member 220 may be in a crosslinked state with the polyimide.

Here, the state that the cover bonding member 220 is crosslinked with the upper substrate means that the polymer chains constituting the cover bonding member 220 and the polymer chains constituting the upper substrate are bundled.

That is, the cover adhesive member 220 is cross-linked with the side surface 511 and the bottom surface 512 of the cover glass 210 and the top surface 501 of the display panel 200 in the bending area BA, . Therefore, the cover bonding member 220 is positioned between the cover glass 210 and the display panel 200 and can be bonded thereto.

On the other hand, the entire upper surface 521 of the cover bonding member 220 and the opposite surface 522 of the side where the cover bonding member 220 is bonded to the cover glass 210 may be in a self-crosslinked state.

Here, the self-crosslinking refers to a state in which the cover bonding member 220 is not bonded to another structure but a crosslinking is generated inside the material constituting the cover bonding member 220. That is, the polymer chains of the material forming the cover bonding member 220 are bound together.

As such, when the polymer chains are bound together in the cover bonding member 220, the internal bonding force of the substance increases. Therefore, the cover adhesion member 220 in the self-crosslinked portion can be made harder than the non-self-crosslinked portion. That is, the portion of the self-crosslinking cover adhesive member 220 can be made harder than the portion of the cover adhesive member 220 that is in a state of being cross-linked with other structures.

In addition, the polymer chains of the cover bonding member 220 are bonded to the polymer chains of other structures to develop an adhesive force. In the self-crosslinking region of the cover bonding member 220, the polymer chains may have different structures (for example, The upper substrate of the panel), so that the adhesive force is not exhibited. That is, the cover adhesive member 220 may not have an adhesive force in the self-crosslinked region.

This prevents the foreign substance from adhering to the entire upper surface 521 of the cover bonding member 220 which is the self-crosslinked region and the entire opposite surface 522 of the cover bonding member 220 to the surface to which the cover bonding member 220 is adhered can do.

Since the upper surface 521 of the cover bonding member 220 and the opposite surface 522 of the cover bonding member 220 to the surface to which the cover bonding member 220 is bonded are tightened by self- 220 can flow to other areas and the cover adhesive member 220 can be prevented from being placed in an undesired area.

In summary, the cover adhesion member 220 has an adhesive force at a portion where the cover glass 210 is in contact with the display panel 200, and an adhesive force at a portion where the cover glass 210 is not in contact with the display panel 200 It may be in a non-existent state.

As described above, there is a method of irradiating the display device 100 including the cover adhesive member 220 with ultraviolet rays so that the cover adhesive member 220 has a partially different physical coupling state.

For example, ultraviolet rays are irradiated from the upper surface of the cover glass 210 in a state where the cover glass 210, the cover adhesive member 220, and the display panel 200 are stacked in this order.

At this time, in a portion where the cover adhesive member 220 contacts the cover glass 210 or the display panel 200, the cover adhesive member 220 is crosslinked with the cover glass 210 and the display panel 200, The cover bonding member 220 can self-crosslink at a portion where the member 220 does not contact the cover glass 210 or the display panel 200.

That is, when the cover bonding member 220 is irradiated with ultraviolet rays, the cover bonding member 220 is cross-linked with other structures that are in contact with other structures, and self-crosslinks with other structures.

Particularly, when the cover bonding member 220 is made of a hydrophilic polymer material, the cover bonding member 220 becomes active in crosslinking with the silica of the cover glass 210, so that the cover bonding member 220 and the cover glass 210 ) Can be tightened.

As described above, since the cover adhesive member 220 has a different adhesive force for each region, the cover glass 210 and the display panel 200 are coupled together while the side of the cover glass 210 is covered, .

2 to 5, the description has been given of the structure in which the adhesive portion 321 and the cover portion 322 of the cover adhesive member 220 are integrated. However, the present invention is not limited thereto, The configuration can be varied.

Illustratively, a display device according to another embodiment of the present invention is shown in Figs. 6-8.

6 to 8 are sectional views showing a display device according to another embodiment of the present invention. In the following description, the contents overlapping with the above-described embodiments may be omitted.

6, the display device 100 includes a cover adhesive member 220 having a modulus of the adhesive portion 321 and a modulus of the cover portion 322 different from each other. Here, the modulus of the adhesive portion 321 and the cover portion 322 may be lower than the modulus of the cover glass 210 and the modulus of the display panel 200.

At this time, the adhesive portion 321 may be made of a transparent polymer material, and the cover portion 322 may be made of a transparent or opaque polymer material.

Therefore, even if the modulus of the adhesive portion 321 and the cover portion 322 are different from each other, the cover glass 210 and the display panel 200 having relatively high modulus (compared to the cover adhesive member) It is possible to control the distribution of the stresses generated in the inner circumferential surface.

7, the cover portion 322 is positioned on at least one side of the adhesive portion 321 and the cover glass 210. However, as shown in FIG. 7, the cover portion 322 of the cover adhesive member 320 May be in contact with a part of the upper surface of the adhesive portion 321 and may be located on at least one side of the cover glass 320 only.

8, the cover 322 is formed as one layer. However, as shown in FIG. 8, the cover 322 may include a plurality of layers 621 and 622. FIG.

Specifically, the cover portion 322 can include a plurality of layers 621, 622 having different moduli. That is, the cover portion 322 may include a plurality of layers 621 and 622 made of different materials. In this case, it suffices if the modulus of at least one layer is different from the modulus of the remaining layers.

The modulus of the plurality of layers 621 and 622 of the cover portion 322 may be smaller than the modulus of the cover glass 210 and the display panel 200.

Therefore, when bending the display device 100, it is possible to control the distribution of the stress generated in the cover glass 210 and the display panel 200 with a relatively high modulus (as compared with the cover adhesive member).

In addition, since the cover portion 322 includes a plurality of layers 621 and 622, at least one interface (a region between a plurality of layers) by the plurality of layers 621 and 622 exists in the cover portion 322 .

On the other hand, the interface between different materials has the effect of delaying or blocking the penetration of moisture and air. Since the cover portion 322 includes a plurality of layers 621 and 622, 0.0 > 100). ≪ / RTI >

1 to 8, the present invention is not limited to the configuration in which the bending area BA is one in the display device 100 of the present invention. However, the present invention is not limited to this, and as shown in Figs. 9 and 10 The display device 100 may include a plurality of bending areas BA1 and BA2.

9 is a plan view of a display device according to embodiments of the present invention having a plurality of bending regions. 10 is a perspective view of the display device of Fig. In the following description, the contents overlapping with the above-described embodiments may be omitted.

9 and 10, the display device 100 includes a plurality of bending areas BA1 and BA2 and a plurality of non-bending areas NBA1, NBA2, and NBA3.

9 and 10, the display device 100 includes first and second bending areas BA1 and BA2 which are two bending areas and first to third non-bending areas NBA1, NBA2 and NBA3 ) Will be described as an example.

This display device 100 includes a cover adhesive member 220 and the cover adhesive member 220 can cover at least one side of the cover glass 210 in at least one bending area BA1 and BA2.

Specifically, the cover bonding member 220 may be positioned so as to correspond to all the side surfaces of the cover glass 210 in the first and second bending areas BA1 and BA2. The cover adhesive member 220 may not be located in the first to third non-bending areas NBA1, NBA2, and NBA3.

Accordingly, the cover bonding member 220 serves to reduce the stress generated in the cover glass 210 in the bending area BA, thereby preventing the cover glass 210 from being broken when the display device 100 is bent.

9 and 10, the display device 100 includes a plurality of bending areas BA and a plurality of non-bending areas NBA1, NBA2 and NBA3. However, the display device 100 ) Is not limited thereto.

For example, as shown in Figs. 11 and 12, the entire area of the display device 100 may be a bending area BA.

11 is a plan view of a display device in which the entire area is a bending area. 12 is a perspective view of the display device of Fig. In the following description, the contents overlapping with the above-described embodiments may be omitted.

Referring to FIGS. 11 and 12, the entire area of the display device 100 may be a bending area BA. At this time, the cover adhesive member 220 can cover the entire side surface of the cover glass 210.

Therefore, the cover bonding member 220 serves to reduce the stress generated in the cover glass 210 on the entire side surface of the cover glass 210, thereby preventing the cover glass 210 from being damaged when the display device 100 is bent do.

In this case, the cover glass 210 and the cover bonding member 220 may cover the entire upper surface of the display panel in a plan view.

12, the cover bonding member 220 may be positioned to correspond to the non-display area NA of the display device 100. [ Therefore, even if the cover adhesive member 220 covers the entire side surface of the cover glass 210, it does not affect the display area AA.

13, the cover bonding member 220 of the present invention can cover the side surface of the cover glass 210 even in a region other than the bending region BA.

13 is a plan view of a display device according to still another embodiment of the present invention. In the following description, the contents overlapping with the above-described embodiments may be omitted.

13, the cover bonding member 220 covers the side surface of the cover glass 210 in the bending area BA and extends to at least one non-bending area NBA1, NBA2 adjacent to the bending area BA .

That is, the cover bonding member 220 covers the side surface of the cover glass 210 in the bending area BA and covers at least one of the first and second non-bending areas NBA1 and NBA2 in the non- NBA1, and NBA2) of the cover glass 210, as shown in FIG.

The cover adhesive member 220 serves to reduce the stress generated in the cover glass 210 in the bending area BA when the display device 100 is bent while at the same time bending the display device 100, The stress generated in the cover glass 210 by the external force applied to the cover glass 210 can be reduced even in the non-bending areas NBA1 and NBA2.

Therefore, the cover bonding member can prevent breakage of the cover glass 210 in the bending area BA and the non-bending areas NBA1 and NBA2.

14 is a view showing a configuration in which the display device according to the embodiments of the present invention includes a cover member.

14, the cover member 1400 is positioned below the back plate 350 and covers the side surfaces of the back plate 350, the display panel 200, the cover adhesion member 220 and the upper surface of the cover adhesion member 220 . In addition, the cover member 140 can cover the side surface of the cover glass 210 exposed by the cover adhesive member 220.

Thus, the cover member 1400 can protect the cover glass 210, the cover bonding member 220, the display panel 200, and the back plate 350.

On the other hand, the cover member 140 is disposed so as to surround the upper surface and the side surface of the cover bonding member 220 that prevents breakage of the cover glass 210 in the bending area BA, It can absorb shock.

When the impact is applied to the bending area BA of the display device 100, the impact is primarily absorbed by the cover member 140 and the impact can be absorbed secondarily by the cover adhesive member 220, It is possible to suppress the breakage of the cover glass 210 even if there is microcracks at the corner of the cover glass 210 in the case of BA.

According to the embodiments of the present invention described above, it is possible to provide a display device having a structure that can prevent breakage of a cover glass in a bendable display device.

According to the embodiments of the present invention, it is possible to provide a display device having a structure capable of preventing foreign matters from adhering to the adhesive member through physical property control of the cover adhesive member disposed between the cover glass and the display panel.

According to the embodiments of the present invention, it is possible to provide a display device having a structure that can prevent the adhesive member from flowing in the non-adhesive portion of the cover adhesive member disposed between the cover glass and the display panel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: display device
200: display panel
210: cover glass
220: cover adhesive member
340: Adhesive layer
350: back plate

Claims (14)

In the display device,
Cover glass;
A cover adhesive member disposed under the cover glass;
A display panel disposed below the cover adhesive member; And
And a back plate disposed below the display panel,
Wherein at least one bending area in which the cover glass, the cover adhesive member, the display panel, and the back plate are bendable covers the at least one side of the cover glass.
The method according to claim 1,
Wherein the cover-
A bonding portion located at a lower portion of the cover glass and smaller than a size of the display panel and adhered to a lower surface of the cover glass and an upper surface of the display panel; And
And a cover portion which is located on a side surface of the cover glass and is adhered to a side surface of the cover glass and adhered to a side surface of the adhering portion or adhered to a portion of the top surface.
3. The method of claim 2,
Wherein a modulus of the cover portion is different from a modulus of the adhesive portion,
And the modulus of the cover portion and the adhesion portion is lower than the modulus of the cover member and the display panel.
3. The method of claim 2,
Wherein the cover portion comprises a plurality of layers having different modulus,
Wherein the modulus of the plurality of layers is lower than the modulus of the cover glass and the display panel.
3. The method of claim 2,
Wherein the display panel includes a display area and a non-display area,
And the cover portion of the cover adhering member is located at a position corresponding to the non-display region of the display panel.
The method according to claim 1,
In the cover adhering member, a portion of the cover glass adhered to the side surface and the bottom surface of the cover glass, and a portion of the cover glass that is not adhered to the side surface and the bottom surface,
Wherein a portion of the cover glass adhered to the side surface and the bottom surface is in a state of being physically coupled to the side surface and the bottom surface of the cover glass.
The method according to claim 6,
Wherein a portion of the cover adhesive member adhered to the side surface and the bottom surface of the cover glass is crosslinked with silica of the cover glass.
The method according to claim 1,
Wherein a portion of the cover adhesive member adhered to an upper surface of the display panel is in a state of being physically coupled to an upper surface of the display panel.
9. The method of claim 8,
Wherein a portion of the cover adhesive member adhered to the upper surface of the display panel is crosslinked with silica or polymer of the substrate of the display panel.
The method according to claim 1,
Wherein an upper surface of the cover adhesive member and a surface opposite to a surface to which the cover adhesive member is adhered to the cover glass are self-crosslinked.
The method according to claim 1,
Wherein a modulus of the cover adhesive member is lower than a modulus of the cover glass.
The method according to claim 1,
Wherein the cover adhesive member extends to at least one non-bending area adjacent to the bending area.
The method according to claim 1,
Further comprising a cover member located below the back plate,
Wherein the cover member surrounds the back plate, the display panel, the side surfaces of the cover adhesion member, and the upper surface of the cover adhesion member.
1. A flexible display device comprising at least one bending area,
Cover glass;
A cover adhesive member disposed under the cover glass;
A display panel disposed below the cover adhesive member; And
And a back plate disposed below the display panel,
A bonding portion which is located at a lower portion of the cover glass and is bonded to a lower surface of the cover glass and an upper surface of the display panel in the bending region; And a cover portion adhered or adhered to a part of the upper surface.

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