DISPLAY DEVICE

Abstract

A display device (100, 1000, 2000), comprising: a display panel (120); a first rear cover (110a) that supports the display panel (120) on a rear surface of the display panel (120); at least one flexible layer (130) electrically connected to a lower end of the rear surface of the display panel (120) and arranged on a rear surface of the first rear cover (110a); a printed circuit board (140) which is electrically connected to the at least one flexible layer (130) and is arranged on the back surface of the first back cover (110a); a cover unit (150, 1050, 1060, 2050) that accommodates the at least one flexible layer (130) and the printed circuit board (140) on the rear surface of the first rear cover (110a); and a roller (171) around which the display panel (120) and the first back cover (110a) are wound or unwound, wherein the roller (171) has a cylindrical shape in which part of an outer circumferential surface is provided by means of a first flat section (171Fa) and a second flat section (171Fb) and the remaining part of the outer circumferential surface is provided by means of a curved section (171R), where a radius of curvature at a boundary of the first flat section (171Fa) and the second flat section (171Fb) is smaller than the radius of curvature of the curved section (171R), the cover unit (150) comprises: a cover plate (153) in which one surface has a convex shape and the other surface provides a first bottom surface (152a) and a second bottom surface (152b) such that, in a wound-up state of the display device, they correspond to the first flat section (171Fa) and the second flat section (171Fb) of the roll (171); and a base plate (151) having a first flat surface and a second flat surface and being arranged such that they correspond to the first bottom surface (152a) and the second bottom surface (152b) of the cover plate (153), wherein the first ground surface (152a) and the second ground surface (152b) form a surface which is curved in two planes such that they correspond to the first flat section (171Fa) and the second flat section (171Fb) of the roll (171).

Description

BACKGROUND Technical area

[0001] The present disclosure relates to a display device and in particular to a rollable display device which can display images even when rolled up. Discussion of the related technology

[0002] Display devices used as a screen for a computer, television, or mobile phone include organic light-emitting display devices (OLEDs), which are self-emitting devices, liquid crystal display devices (LCDs), which require a separate light source, and similar devices.

[0003] One application area of ​​the display device is extended to include both minicomputers and monitors of computers and televisions, and a display device with a large display area and reduced volume and weight is being researched.

[0004] Furthermore, a rollable display device, which is manufactured by forming a display element and a wiring line on a flexible substrate, such as plastic, which is a flexible material, so that it can display images even though the display device is rolled up, has recently received attention as a next-generation display device.

[0005] KR 1 01 945 985 B1 and DE 10 2019 117 391 A1 describe a display device comprising a display field with a display area in which several display elements are arranged and a non-display area in which one or more wires for controlling the several display elements are arranged. A rear cover is attached to a surface of the display field and has several openings. A roller unit winds or unwinds the rear cover and the display field, and a lifting unit moves the rear cover and the display field in a vertical direction. The several openings overlap with the display field, and each of the several openings is arranged so that it is offset from one or more of the openings in an adjacent row. One size of the rear cover is larger than one size of the display field.

[0006] The state of the art is further cited in KR 10 2017 006 013 A and EP 3 761 293 B1. SUMMARY

[0007] Accordingly, embodiments of the present disclosure relate to a display device that essentially prevents one or more of the problems arising from limitations and disadvantages of the related technology.

[0008] One objective of the present disclosure is to provide a display device that consistently maintains the form of a flexible layer, even during repeated winding and unwinding.

[0009] Additional features and aspects are disclosed in the following description and are partly evident from the description or can be learned by applying the inventive concepts provided herein. Other features and aspects of the inventive concepts can be realized and achieved by means of the structure particularly highlighted in the description and the resulting claims as well as the attached drawings, or can be derived from them.

[0010] To achieve these and other aspects of the inventive concepts, as set forth and described in detail herein, a display device according to claim 1 is provided. Further embodiments are described in the dependent claims.According to one aspect of the present disclosure, a display device comprises a display panel, a first back cover supporting the display panel on a back surface of the display panel, at least one flexible layer connected to a lower end of the back surface of the display panel and arranged on a back surface of the first back cover, a printed circuit board connected to the at least one flexible layer and arranged on the back surface of the first back cover, a cover unit accommodating the at least one flexible layer and the printed circuit board on the back surface of the first back cover, and a roller around which the display panel and the first back cover are wound or unwound.

[0011] Other detailed items of the exemplary embodiments are included in the detailed description and drawings.

[0012] According to the present disclosure, the shape of the flexible layer is constantly maintained, even during repeated winding and unwinding, so that the springiness of the pad area due to the tensile stress of the flexible layer may be improved.

[0013] It should be noted that both the preceding general description and the following detailed description are exemplary and explanatory and are intended to provide a further explanation of the inventive concepts as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are attached to provide a deeper understanding of the revelation and which are incorporated into and form part of this application, illustrate embodiments of the revelation and, together with the description, serve to explain various principles. The drawings include: are Fig. 1A and Fig. 1B Perspective views of a display device according to an exemplary embodiment of the present disclosure; is Fig. 2 a perspective view of a display device according to an exemplary embodiment of the present disclosure; is Fig. 3 a schematic cross-sectional view of a display device according to a comparative example; is Fig. 4 a top view of a display unit of a display device according to an exemplary embodiment of the present disclosure; is Fig. 5 a top view of a display unit of a display device according to an exemplary embodiment of the present disclosure; is Fig. 6 a cross-sectional view along line VI-VI' of the Fig. 4; is Fig. 7 a cross-sectional view along line VII-VII' of the Fig. 4; are Fig. 8A to 8D Cross-sectional views of a fastening process of a display device according to an exemplary embodiment of the present disclosure; are Fig. 9A to 9D Cross-sectional views in accordance with a control state of a display device according to an exemplary embodiment of the present disclosure; is Fig. 10A a schematic cross-sectional view of a roll according to a comparative design form; is Fig. 10B a schematic cross-sectional view of a roller according to an exemplary embodiment of the present disclosure; are Fig. 11A and Fig. 11B Perspective views illustrating the attachment of a first rear cover and a display panel in a display device according to an exemplary embodiment of the present disclosure; are Fig. 12A and Fig. 12B Perspective views showing the attachment of a first rear cover and a head rod in a display device according to an exemplary embodiment of the present disclosure; is Fig. 13 a perspective view showing the attachment of a second rear cover and a display panel in a display device according to an exemplary embodiment of the present disclosure; is Fig. 14 a perspective view showing the attachment of a second rear cover and a display panel and a cover unit in a display device according to an exemplary embodiment of the present disclosure; is Fig. 15 a cross-sectional view of a display device according to another exemplary embodiment of the present disclosure; is Fig. 16 a cross-sectional view of a display device according to a further comparative example; and are Fig. 17A to 17D Cross-sectional views of a fastening process of a display device according to a further comparative example. DETAILED DESCRIPTION

[0015] The advantages and properties of the present disclosure and a method for achieving these advantages and properties are disclosed with reference to exemplary embodiments, which are described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the exemplary embodiments disclosed herein, but will be implemented in various forms. These exemplary embodiments are provided merely to enable the person skilled in the art to fully understand the disclosures and the scope of the present disclosure. Therefore, the present disclosure is defined solely by the scope of the appended claims.

[0016] The shapes, sizes, ratios, angles, numbers, and the like shown in the accompanying drawings to describe exemplary embodiments of the present disclosure are merely examples, and the present disclosure is not limited to them. The same reference numerals generally denote the same elements throughout the entire application. Furthermore, a detailed description of known related technologies may be omitted from the following description of the present disclosure to avoid unnecessary obfuscation of the subject matter of the present disclosure. The terms used herein, such as "have," "comprising," and "consisting of," are generally intended to allow the addition of other components, except when the terms are used with the word "only." All references to the singular may include the plural, unless expressly stated otherwise.

[0017] Elements are designed to have an ordinary error range, even if not expressly specified.

[0018] When the spatial relationship between two parts is described using terms such as "on", "above", "below" and "next to", one or more parts may be located between the two parts, except when the terms are used with the term "exactly" or "directly".

[0019] If one element or layer is positioned "on" another element or layer, another layer or element can be inserted directly on top of the other element or in between.

[0020] Although the terms "first," "second," and similar terms are used to describe various elements, these elements are not restricted by these terms. These terms are used only to distinguish one element from the others. Therefore, a first element mentioned below may be a second element in a technical concept of the present disclosure.

[0021] The same reference numerals generally denote identical elements throughout the entire application.

[0022] The size and thickness of each element shown in the drawing are shown for convenience of description, and the present disclosure is not limited to the size and thickness of the element shown.

[0023] The features of different embodiments of the present disclosure may be partially or completely attached to one another or combined with one another and may be interlocking and technically operated in different ways, and the embodiments may be carried out independently of one another or in conjunction with one another.

[0024] In the following, a display device according to exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. <Anzeigevorrichtung - rollbare Anzeigevorrichtung>

[0025] A rollable display device can be defined as a display device capable of showing images even though it is rolled up. Compared to a general display device of the related technology, a rollable display device can exhibit considerable flexibility. Depending on its use, the form of a rollable display device can vary considerably. Specifically, when not in use, the rollable display device is rolled up for storage with a reduced volume. Conversely, when in use, the rolled-up display device is unrolled for use.

[0026] Fig. 1A and Fig. Figure 1B are perspective views of a display device according to an exemplary embodiment of the present disclosure. Referring to Fig. 1A and Fig. 1B comprises a display device 100 according to an exemplary embodiment of the present disclosure, a display unit DP and a housing unit HP.

[0027] The display unit DP is an arrangement for displaying images to a user, and the display unit DP may contain, for example, a display element and a circuit, a wiring line and a component for controlling the display element.

[0028] Since the display device 100 according to the exemplary embodiment of the present disclosure is a rollable display device, the display unit DP can be configured to be wound up or unwound. The display unit DP can be configured by means of a display panel and a rear cover that have the flexibility to be wound up or unwound. The display unit DP is described below with reference to Fig. 4, Fig. 5 to Fig. 6 will be described in more detail.

[0029] The HP housing unit is an enclosure that contains the DP display unit. The DP display unit can be wound up to be housed inside the HP housing unit, and the DP display unit can be unwound to be positioned on the outside of the HP housing unit.

[0030] The HP housing unit has an opening HPO through which the DP display unit moves to the inside and outside of the HP housing unit. The DP display unit can move vertically by passing through the HPO opening of the HP housing unit.

[0031] The display unit DP can be switched from a fully unwound state to a fully wound state or from a fully wound state to a fully unwound state.

[0032] Fig. Figure 1A represents a fully unwound state of the display unit DP of the display device 100, and in the fully unwound state, the display unit DP of the display device 100 is located on the outside of the housing unit HP. This means that if the display unit DP is unwound as far as possible to position it on the outside of the housing unit HP, and cannot be unwound any further for a user to view images through the display unit 100, this can be defined as a fully unwound state.

[0033] Fig. Figure 1B represents a fully wound state of the display unit DP of the display device 100. In this fully wound state, the display unit DP of the display device 100 is contained within the housing unit HP and cannot be wound further. This means that when the user is not viewing images through the display device 100, it is advantageous from an external appearance point of view that the display unit DP is not located on the outside of the housing unit HP. Therefore, when the display unit DP is wound to be contained within the housing unit HP, this is defined as a fully wound state. Furthermore, when the display unit DP is in a fully wound state, so that it is contained within the housing unit HP, the volume of the display device 100 is reduced, and the display device 100 can be easily carried.

[0034] To adjust the display unit DP to a fully unwound state or a fully wound state, a control unit that winds or unwinds the display unit DP can be arranged. < Control unit >

[0035] Fig. Figure 2 is a perspective view of a display device according to an exemplary embodiment of the present disclosure.

[0036] Fig. Figure 3 is a schematic cross-sectional view of a display device according to a comparative example. Fig. Figure 3 is a schematic cross-sectional view to explain a roller 171 and a display unit DP of a display device 100. For ease of description, in Fig. 3 only one HP housing unit, one 171 reel and one DP display unit are shown.

[0037] First, referring to Fig. 2, a control unit MP, a roller unit 170 and a lifting unit 180.

[0038] The roller unit 170 rotates clockwise or counterclockwise to wind or unwind the display unit DP, which is fixed to the roller unit 170. The roller unit 170 comprises a roller 171 and a roller support unit 172.

[0039] The roller 171 is a component around which the display unit DP is wound. The roller 171 is cylindrical in shape. A lower edge of the display unit DP can be fixed to the roller 171. When the roller 171 rotates, the display unit DP, fixed to the roller 171 by its lower edge, can be wound around the roller 171. Conversely, when the roller 171 rotates in the opposite direction, the display unit DP, wound around the roller 171, can be unwound from the roller 171.

[0040] Referring to Fig. 3. The roller 171 can be formed such that it has a cylindrical shape in which at least part of an outer circumferential surface of the roller 171 is flat and the remaining part of the outer circumferential surface is a curved section. Although the roller 171 can be entirely cylindrical, a portion of it can be formed from a flat surface. This means that part of the outer circumferential surface of the roller 171 can be formed such that it is flat, and the remaining part of the outer circumferential surface can be formed such that it is a curved surface. The roller 171 is configured by means of a curved section 171R, a first flat section 171Fa, and a second flat section 171Fb. In this case, the majority of flexible layers 130 of the display unit DP, or the printed circuit board 140, are mounted on the first flat section 171Fa and the second flat section 171Fb of the roller 171.However, the roll 171 can have a completely cylindrical shape or an arbitrary shape that can wind up the display unit DP, but is not limited to this. A winding operation of the roll 171, which is set up by means of a flat section 171F, a first curved section 171Ra and a second curved section 171Rb, and the display unit DP are described below with reference to . Fig. 9A to 9D will be described.

[0041] Referring once again to Fig. 2. The roller support unit 172 can support the roller 171 on both sides. In particular, the roller support unit 172 is arranged on a bottom surface HPF of the housing unit HP, and an upper side surface of the roller support unit 172 can be coupled to both side ends of the roller 171. This allows the roller support unit 172 to support the roller 171 such that it is positioned at a distance from the bottom surface HPF of the housing unit HP. The roller 171 can be rotatably coupled to the roller support unit 172.

[0042] The lifting unit 180 can move the display unit DP in a vertical direction in accordance with the control of the roller unit 170. The lifting unit 180 can include a connecting unit 181, a head rod 182, a slide rail 183, a sliding carriage 184, a motor 185, and a rotary unit 186.

[0043] The connecting unit 181 of the lifting unit 180 can have a plurality of connections 181a and 181b and a joint unit 181c that connects the plurality of connections 181a and 181b together. In particular, the plurality of connections 181a and 181b can have a first connection 181a and a second connection 181b, and the first connection 181a and the second connection 181b intersect in the form of scissors such that they are rotatably attached to one another by means of the joint unit 181c. When the connecting unit 181 moves in the vertical direction, the plurality of connections 181a and 181b can rotate such that they are far apart or close together.

[0044] The head rod 182 of the lifting unit 180 can be fixed to one of the upper ends of the display unit DP. The head rod 182 is coupled to the connecting unit 181 such that the display unit DP is moved vertically in accordance with the rotation of the majority of connections 181a and 181b of the connecting unit 181. This means that the display unit DP can be moved vertically by means of the head rod 182 and the connecting unit 181.

[0045] The head bar 182 covers only a portion of a surface adjacent to the top edge of the display unit DP, such that it does not obscure an image displayed on the top surface of the display unit DP. The display unit DP and the head bar 182 can be fixed by means of a screw, but are not limited to this.

[0046] The sliding rail 183 of the lifting unit 180 can provide a path of movement for the majority of connections 181a and 181b. Some of the majority of connections 181a and 181b can be rotatably attached to the sliding rail 183, so that the movement is guided along a path of movement of the sliding rail 183. Some of the majority of connections 181a and 181b can be attached to the sliding carriage 184, which is provided so as to be movable along the sliding rail 183 that it moves along a path of movement of the sliding rail 183.

[0047] Motor 185 is connected to a power generation unit, such as a separate external voltage source or a built-in battery, in such a way that energy is supplied to it. Motor 185 generates a torque to provide a control force to the rotary unit 186.

[0048] The rotary unit 186 is connected to the motor 185 in such a way that it is configured to convert a rotary motion from the motor 185 into a linear reciprocating motion. This means that the rotary motion of the motor 185 can be converted into the linear reciprocating motion of a structure fixed to the rotary unit 186. For example, the rotary unit 186 can be implemented by means of a shaft and a ball screw with a nut attached to the shaft, but this is not the only possible configuration.

[0049] The motor 185 and the rotary unit 186 work together to raise and lower the display unit DP with the connecting unit 181. The connecting unit 181 is designed with a connection structure for receiving the control force from the motor 185 and the rotary unit 186 for repeated folding or unfolding.

[0050] When the display unit DP is wound up, the motor 185 is controlled such that the structure of the rotary unit 186 can perform the linear movement. This means that a portion of the rotary unit 186, to which one end of the second connection 181b is coupled, can perform the linear movement. Therefore, one end of the second connection 181b can move towards the motor 185, and the majority of connections 181a and 181b are folded in such a way that the height of the connection unit 181 is reduced. Furthermore, while the majority of connections 181a and 181b are folded, the head rod 182, which is coupled to the first connection 181a, is also lowered, and one end of the display unit DP, which is coupled to the head rod 182, is also lowered.

[0051] When the display unit DP is unwound, the motor 185 is controlled such that the structure of the rotary unit 186 can perform the linear movement. This means that a portion of the rotary unit 186, to which one end of the second connection 181b is coupled, can perform the linear movement. Therefore, one end of the second connection 181b can move away from the motor 185, and the majority of connections 181a and 181b are unfolded so that the height of the connection unit 181 can be increased. Furthermore, when the majority of connections 181a and 181b are unfolded, the head rod 182, which is coupled to the first connection 181a, is also raised, and one end of the display unit DP, which is coupled to the head rod 182, is also raised.

[0052] Accordingly, when the display unit DP is completely wound around the roll 171, the connecting unit 181 of the lifting unit 180 can remain in a folded state. This means that when the display unit DP is completely wound around the roll 171, the lifting unit 180 can have its minimum height. When the display unit DP is completely unwound, the connecting unit 181 of the lifting unit 180 can remain in an unfolded state. This means that when the display unit DP is completely unwound, the lifting unit 180 can have its maximum height.

[0053] When the display unit DP is wound up, the reel 171 can rotate and the display unit DP can be wound up around the reel 171.

[0054] For example, with reference to Fig. 3, a lower edge of the display unit DP is coupled to the roller 171. When the roller 171 rotates in a second direction DR2, that is, counterclockwise, the display unit DP can be wound up while a rear surface of the display unit DP is in close contact with the upper surface of the roller 171.

[0055] On the other hand, when the display unit DP is unwound, the reel 171 can rotate, and the display unit DP can be unwound from the reel 171. For example, with reference to Fig. 3, when the roller 171 rotates in a first direction DR1, that is, clockwise, the display unit DP, which is wound around the roller 171, is unwound from the roller 171 in such a way that it is located on the outside of the housing unit HP.

[0056] In some exemplary embodiments, a control unit MP, which has a different structure than that of the control unit MP described above, can be applied to the display unit 100. This means that, as long as the display unit DP is wound and unwound, the arrangement of the roller unit 170 and the lifting unit 180 described above may be modified, some structures may be omitted, or another structure may be added. < Display unit >

[0057] Fig. Figure 4 is a top view of a display unit of a display device according to an exemplary embodiment of the present disclosure.

[0058] Fig. Figure 5 is a top view of a display unit of a display device according to an exemplary embodiment of the present disclosure.

[0059] Fig. 6 is a cross-sectional view along line VI-VI' of the Fig. 4.

[0060] Fig. 7 is a cross-sectional view along line VII-VII' of the Fig. 4.

[0061] Fig. Figures 8A to 8D are cross-sectional views of a fastening process of a display device according to an exemplary embodiment of the present disclosure.

[0062] Fig. Figure 4 is a top view of a display unit DP from the viewing direction, and Fig. Figure 5 is a top view of a display unit DP from the rear of the display device.

[0063] Fig. Figure 8A represents a state of a first rear cover 110a, a second rear cover 110b, the display panel 120 and a cover assembly 150 of the present disclosure, before they are attached to one another. Fig. 8B represents a state in which the first rear cover 110a, the second rear cover 110b and the display panel 120 are attached to each other. Fig. Figure 8C represents a state of the first rear cover 110a, the second rear cover 110b, the display panel 120 and the cover unit 150 after they have been attached to each other. Fig. 8D represents a state in which the roller 171 is attached to the second rear cover 110b.

[0064] Referring to Fig. 4, Fig. 5, Fig. 6 to Fig. 7 and Fig. 8A to 8D, the display unit DP can have a back cover 110, a display panel 120, a plurality of flexible layers 130, a printed circuit board 140, and a cover unit 150. In Fig. 4, Fig. 5 to Fig. For the sake of convenience, the cover unit 150 is not shown in Figure 6.

[0065] Referring to Fig. 4 and Fig. 5. According to the exemplary embodiment of the present disclosure, the cover unit 110 is arranged on a rear surface (and on a front surface of part of a lower end) of the display panel 120 such that it supports the display panel 120, the plurality of flexible layers 130, and the printed circuit board 140. The rear cover can be larger than the display panel 120. The rear cover 110 can protect other structures of the display unit DP from the outside.

[0066] Although the back cover 110 is made of a rigid material, at least a portion of it may possess flexibility to allow it to be wound or unwound along with the display panel 120. For example, the back cover 110 may be made of a metallic material, such as stainless steel (SUS) or Invar, or of plastic. However, if the material of the back cover 110 meets specific physical requirements, such as a certain amount of thermal expansion, a certain radius of curvature, and a certain stiffness, the material may be varied depending on the design and is not limited to these.

[0067] The back cover 110 can have a plurality of support areas PA and a plurality of deformable areas MA. The plurality of support areas PA are areas in which a plurality of openings 111 are not arranged, and the plurality of deformable areas MA are areas in which a plurality of openings 111 are arranged.

[0068] The rear cover 110 according to the exemplary embodiment of the present disclosure can have a first rear cover 110a and a second rear cover 110b. This means that the rear cover 110 according to the exemplary embodiment of the present disclosure can be configured such that it is subdivided into the first rear cover 110a and the second rear cover 110b. For example, the rear cover 110 according to the exemplary embodiment of the present disclosure can be configured such that it is subdivided into the first rear cover 110a, which is arranged on a rear surface of the display panel 120 with respect to a lower end of the display panel 120, and the second rear cover 110b, which is arranged on a front surface of the display panel 120.

[0069] In this case, the first rear cover 110a can be attached to the head bar 182, and the second rear cover 110b can be attached to the roller 171.

[0070] The first back cover 110a may have a first support area PA1, a first deformable area MA1, a second support area PA2 and a second deformable area MA2, but is not limited to this.

[0071] The second back cover 110b may have a third support area PA3, a third deformable area MA3 and a fourth support area PA4, but is not limited to this.

[0072] Since the back cover 110 is wound or unwound in a slit direction, the majority of support areas PA and the majority of deformable areas MA can be arranged along the slit direction.

[0073] First, the first support area PA1 is the uppermost area of ​​the first back cover 110a and is attached to the headstock 182. The first support area PA1 has first mounting holes AH1 for attachment to the headstock 182. For example, the headstock 182 can be attached to the first support area PA1 of the first back cover 110a by a screw passing through the headstock 182 and the first mounting holes AH1. Because the first support area PA1 is attached to the headstock 182, when the connecting unit 181, which is attached to the headstock 182, is raised or lowered, the first back cover 110a can also be raised and lowered, and the display panel 120, which is attached to the first back cover 110a, can also be raised and lowered. Although in Fig. 4 and Fig. Although five first fastening holes AH1 are shown in section 5, the present disclosure is not limited to these. Furthermore, although in Fig. 4 and Fig. As described in section 5, the first rear cover 110a is attached to the headstock 182 using the first mounting holes AH1; however, this is not limited to this, and the first rear cover 110a and the headstock 182 can be attached to each other without using a separate mounting hole.

[0074] The first deformable area MA1 is an area extending from the first support area PA1 to a lower side of the first back cover 110a. The first deformable area MA1 is an area in which a plurality of openings 111 can be arranged, and the display panel 120 is attached to it. In particular, the first deformable area MA1 is an area that is wound onto or unwound from the roll 171 together with the display panel 120. The first deformable area MA1 can overlap at least the display panel 120 with other structures of the display unit DP.

[0075] The second deformable area MA2 is an area extending from the first deformable area MA1 to a lower side of the first back cover 110a. A portion of the cover unit 150, which includes the printed circuit board 140 connected to the majority of flexible layers, can be located on the back surface of the second deformable area MA2.

[0076] The second deformable area MA2 is located between the first deformable area MA1 and the second support area PA2. A plurality of openings 111 are arranged in the second deformable area MA2.

[0077] The second deformable area MA2 is an area that is arranged between the first deformable area MA1 and the second support area PA2 such that the second support area PA2 is wound onto the second flat section 171Fb of an outer circumferential surface of the roll 171.

[0078] The second support area PA2 is an area extending from the second deformable area MA2 to a lower side of the first back cover 110a. Another part of the cover unit 150, which has some of the majority of flexible layers 130 coupled to one end of the display panel 120, can be arranged on the back surface of the second support area PA2.

[0079] The second support area PA2 can provide support in such a way that the majority of flexible layers 130 are kept flat without being bent when the majority of flexible layers 130 are rolled onto the roll 171 to protect the majority of flexible layers 130.

[0080] Furthermore, when the second support area PA2 is wound around the roll 171, a portion of the outer circumferential surface of the roll 171, which is arranged opposite the second support area PA2, can be formed in such a way that it is flat. Accordingly, the majority of flexible layers 130, which are arranged in the second support area PA2, can also be maintained in such a way that they are flat.

[0081] Furthermore, the third support area PA3 is a top end region of the second back cover 110b, and a lower end of the display panel 120 is attached to it. For example, the bottom of the display panel 120 can be attached to the third support area PA3 by means of a third adhesive layer AD3.

[0082] The first rear cover 110a of the second support area PA2 and the second rear cover 110b of the third support area PA3 can be coupled with the display panel 120.

[0083] In the display device 100 according to the embodiment of the present disclosure, the back cover 110 is provided by means of the first back cover 110a and the second back cover 110b, which are separated from each other to form the back cover 110 in such a way that they correspond to different sizes of the display panel 120. As the size of the display device 100 is gradually increased, the size of the display panel 120 is also increased. In this case, the back cover 110 must be larger than the display panel 120 in order to protect and support the display panel 120, so that a single back cover 110 must be manufactured to be large. However, if the single back cover 110 is manufactured to correspond to the large-format display panel 120, a difficulty may arise in the manufacturing process.Therefore, in the display device 100 according to the exemplary embodiment of the present disclosure, the back cover 110 is provided by means of the first back cover 110a and the second back cover 110b, and the first back cover 110a and the second back cover 110b can be coupled using the display panel 120. Accordingly, the first back cover 110a and the second back cover 110b can perform all the functions of the back cover 110 of the related technology, and the back cover 110 can be manufactured to be smaller, so that the productivity of the back cover 110 can be improved.

[0084] The third deformable area MA3 is an area extending from the third support area PA3 to a lower side of the second rear cover 110b. A plurality of openings 111 can be arranged in the third deformable area MA3. The third deformable area MA3 is an area that extends such that the display area AA of the display panel 120 is located on the outside of the housing unit HP. This means that, for example, when the rear cover 110 and the display panel 120 are fully unwound, an area extending from the fourth support area PA4 of the second rear cover 110b, which is fixed to the roll 171, to the second deformable area MA2, in which the cover unit 150 is located, can be located in the housing unit HP. The first deformable area MA1 and the first support area PA1, to which the display panel 120 is attached, can be located on the outside of the housing unit HP.This means that when the display panel 120 is fully unwound, the fourth support area PA4, which is fixed to the roller 171, the third deformable area MA3, the third support area PA3, the second deformable area MA2, and the second support area PA2, which extend from the fourth support area PA4, can be arranged in the housing unit HP. However, the present disclosure is not limited to this.

[0085] If the length from the fourth support area PA4 to the second deformable area MA2 is less than the length from the fourth support area PA4 to the opening HPO of the housing unit HP, part of the first deformable area MA1, to which the display panel 120 is attached, may be located within the housing unit HP. Furthermore, part of the lower end of the display area AA of the display panel 120 may be located within the housing unit HP, potentially causing difficulties in viewing images. Therefore, the length from the fourth support area PA4, which is fixed to the roller 171, to the third deformable area MA3, the third support area PA3, the second support area PA2, and the second deformable area MA2 can be designed to be equal to the length from the fourth support area PA4, which is fixed to the roller 171, to the opening HPO of the housing unit HP.

[0086] The fourth support area PA4 is an area extending from the third deformable area MA3 to a lower side of the second back cover 110b. The fourth support area PA4 is a bottommost area of ​​the second back cover 110b and is attached to the roll 171. The fourth support area PA4 may have second mounting holes AH2 for attachment to the roll 171. For example, screws passing through the roll 171 and the second mounting holes AH2 are arranged to fasten the roll 171 and the fourth support area PA4 of the second back cover 110b together. Because the fourth support area PA4 is attached to the roll 171, the second back cover 110b can be wound around or unwound from the roll 171. Although in Fig. 4 and Fig. Where two second mounting holes AH2 are shown, the number of second mounting holes AH2 is not limited to this.

[0087] In the first support area PA1, the second support area PA2, the third support area PA3, and the fourth support area PA4, the plurality of openings 111, as formed in the plurality of deformable areas MA, is not formed. Specifically, the first fixing holes AH1 are formed in the first support area PA1, and the second fixing holes AH2 are formed in the fourth support area PA4; however, the plurality of openings 111, as formed in the plurality of deformable areas MA, is not formed in the first support area PA1, the second support area PA2, the third support area PA3, and the fourth support area PA4. Furthermore, the first fixing holes AH1 and the second fixing holes AH2 have different shapes than the plurality of openings 111.The first support area PA1 is an area fixed to the headstock 182, the second support area PA2 and the third support area PA3 are areas in which the flexible layers 130 are supported, and the fourth support area PA4 is an area fixed to the roller 171. Therefore, the support areas can have a stiffness that is greater than that of the majority of deformable areas MA.

[0088] Since the first support area PA1, the second support area PA2, the third support area PA3, and the fourth support area PA4 possess rigidity, the first support area PA1 and the fourth support area PA4 can be stably fixed to the headstock 182 and the roller 171. Furthermore, the second support area PA2 and the third support area PA3 maintain the majority of the flexible layers 130 in such a way that they remain flat and not bent, thus protecting the majority of the flexible layers 130. Therefore, the display unit DP is fixed to the roller 171 and the headstock 182 of the control unit MP in such a way that, in accordance with the operation of the control unit MP, it moves to the inside or outside of the housing unit HP, and the majority of the flexible layers 130 are protected.

[0089] Although in Fig. 4 and Fig. As shown in Figure 5, for example, the majority of support areas PA and the majority of deformable areas MA of the back cover 110 are arranged sequentially along the column direction; when the back cover 110 is wound up in the row direction, the majority of support areas PA and the majority of deformable areas MA can be arranged along a row direction.

[0090] When the display unit DP is wound or unwound, the plurality of openings 111, which are arranged in the plurality of deformable areas MA of the back cover 110, can be deformed by a load acting on the display unit DP. In particular, when the display unit DP is wound or unwound, the plurality of deformable areas MA of the back cover 110 can be deformed because the plurality of openings 111 contract or expand. Furthermore, because the plurality of openings 111 contract or expand, a sliding phenomenon of the display panel 120, which is arranged on the plurality of deformable areas MA of the back cover 110, is minimized, so that the load acting on the display panel 120 can be minimized.

[0091] When the display panel 120 and the back cover 110 are wound up, the difference in the radii of curvature of the display panel 120 and the back cover 110 can cause a difference between the length of the display panel 120 wound around the roll 171 and the length of the back cover 110 wound around the roll 171. For example, when the back cover 110 and the display panel 120 are wound around the roll 171, the length of the first back cover 110a and the second back cover 110b required to be wound once around the roll 171 may differ from the length of the display panel 120 required to be wound once around the roll 171.This means that, since the display panel 120 is positioned on the outside of the first back cover 110a with respect to the roll 171, the length of the display panel 120 required to be wound once around the roll 171 can be greater than the length of the first back cover 110a required to be wound once around the roll 171. As described above, the winding lengths of the back cover 110 and the display panel 120 differ from each other due to the difference in their radii of curvature at the time the display unit DP is wound, and the display panel 120, attached to the back cover 110, can slip such that it is displaced from its original position.In this case, the phenomenon of the display panel 120 shifting away from the back cover 110 due to stress and differences in curvature radii caused by winding can be defined as a sliding phenomenon. If the sliding phenomenon is excessively amplified, the display panel 120 may detach from the back cover 110, or defects such as fractures may occur.

[0092] In the display device 100 according to an exemplary embodiment of the present disclosure, although the display unit DP is wound or unwound and a load acts upon it, the plurality of openings 111 of the back cover 110 are flexibly deformed to reduce the load acting upon the back cover 110 and the display panel 120. For example, if the back cover 110 and the display panel 120 are wound around the roll 171 along the slit direction, a load may act upon them that deforms the back cover 110 and the display panel 120 in a vertical direction. In this case, the plurality of openings 111 of the back cover 110 may stretch in a vertical direction along the back cover 110, and the length of the back cover 110 may be flexibly deformed.Therefore, the difference in lengths between the back cover 110 and the display panel 120, caused by the difference in their radii of curvature during the winding process, can be compensated for by the plurality of openings 111 in the back cover 110. Furthermore, the stress exerted on the display panel 120 by the deformation of the plurality of openings 111 in the back cover 110 during winding can also be reduced.

[0093] Referring to Fig. 4. The display panel 120 can be arranged on a surface of the first rear cover 110a. For example, the display panel 120 can be arranged in the first deformable area MA1 on a surface of the first rear cover 110a.

[0094] The Display Panel 120 is a panel for displaying images to a user. The Display Panel 120 can include a display element that shows images, a control element that controls the display element, and wiring lines that transmit various signals to the display element and the control element.

[0095] The display element can be defined in various ways depending on the type of display panel 120. For example, if the display panel 120 is an organic light-emitting display panel 120, the display element can be an organic light-emitting diode comprising an anode, an organic light-emitting layer, and a cathode. Similarly, if the display element 120 is a liquid crystal display panel, the display element can be a liquid crystal display element. In the following, although the display panel 120 is assumed to be an organic light-emitting display panel for the sake of example, the display panel 120 is not limited to organic light-emitting display panels.Furthermore, since the display device 100 according to the exemplary embodiment of the present disclosure is a rollable display device, the display panel 120 can be implemented as a flexible display panel such that it can be wound around or unwound from the roll 171.

[0096] Referring to Fig. 4. The display panel 120 can have a display area AA and a non-display area NA.

[0097] Display area AA is an area in the display panel where 120 images are displayed. Display area AA can contain a plurality of subpixels, which define the plurality of pixels, and a driver circuit for controlling the plurality of subpixels. The plurality of subpixels are the minimum units that define display area AA, and a display element can be located in any of the plurality of subpixels. For example, an organic light-emitting diode, which has an anode, an organic light-emitting layer, and a cathode, can be located in any of the plurality of subpixels, but is not limited to this. Furthermore, a driver circuit for controlling the plurality of subpixels can include a driver element, a wiring line, and the like.For example, the control circuit can be set up using a thin-film transistor, a storage capacitor, a gate line, a data line and the like, but is not limited to this.

[0098] The non-display area (NA) is an area where no image is displayed. Various wiring lines and circuits for driving the organic light-emitting diode (OLED) of the display area (AA) are located within the non-display area (NA). For example, the non-display area (NA) may contain a connecting line that carries signals to the majority of subpixels, as well as drive circuits for the display area (AA) or a drive IC, such as a gate driver IC or a data driver IC; however, the non-display area is not limited to these components. The pad area may be located within the non-display area (NA) below the display panel (120).

[0099] Referring to Fig. 6 The display panel 120 can have a substrate 121, a buffer layer 122, a pixel unit 123, an encapsulation layer 124 and an encapsulation substrate 125.

[0100] The substrate 121 is a base element that supports various components of the display panel 120 and may be equipped with an insulating material. The substrate 121 can be made of a flexible material, allowing the display panel 120 to be wound or unwound. For example, the substrate 121 can be made of a plastic material, such as polyimide PI.

[0101] The buffer layer 122 is arranged on the substrate 121. The buffer layer 122 prevents moisture and / or oxygen penetrating from the outside of the substrate 121 from spreading. The buffer layer 122 can, for example, be formed from an inorganic material, or it can be configured as a single or double layer of silicon dioxide (SiOx) or silicon nitride (SiNx), but this is not limited to these options.

[0102] The pixel unit 123 is arranged on the substrate 121 and on an upper surface of the buffer layer 122. The pixel unit 123 can comprise a plurality of organic light-emitting diodes and a circuit for driving the plurality of organic light-emitting diodes. The pixel unit 123 can be arranged such that it corresponds to the display area AA.

[0103] The display panel 120 can be configured using a top emission type or a bottom emission type, depending on the emission direction of the light emitted by the organic light-emitting diode.

[0104] According to the top-emission type, light emitted by the organic light-emitting diode is emitted towards an upper region of the substrate 121 on which the organic light-emitting diode is formed. In the case of the top-emission type, a reflective layer can be formed under the anode, so that the light emitted by the organic light-emitting diode can propagate towards the upper region of the substrate 121, i.e., towards the cathode.

[0105] According to the bottom-emission type, light emitted by the organic light-emitting diode (OLD) is emitted to a lower region of the substrate 121 on which the OLD is formed. In the case of the bottom-emission type, only the anode can be formed from a translucent conductive material, so that the light emitted by the OLD can propagate to the lower region of the substrate 121, and the cathode can be formed from the metallic material, which has a high reflectivity.

[0106] For the convenience of description, the following description is given under the assumption that the display device 100 according to an exemplary embodiment of the present disclosure is a bottom-emission type display device, but is not limited thereto.

[0107] The encapsulation layer 124 is arranged such that it covers the pixel unit 123.

[0108] The encapsulation layer 124 seals the organic light-emitting diode of the pixel unit 123. The encapsulation layer 124 can protect the organic light-emitting diode of the pixel unit 123 from moisture, oxygen, and external influences. The encapsulation layer 124 can be formed by alternating layers of multiple inorganic and multiple organic layers. For example, the inorganic layer can be made of an inorganic material such as silicon nitride (SiNx), silicon dioxide (SiOx), or aluminum oxide (AlOx), and the organic layer can be made of epoxy resin or acrylic polymer, but these are not the only options.

[0109] The encapsulation substrate 125 is arranged on the encapsulation layer 124. For example, the encapsulation substrate 125 is arranged between the encapsulation layer 124 and the first back cover 110a. The encapsulation substrate 125, together with the encapsulation layer 124, can protect the organic light-emitting diode of the pixel unit 123. The encapsulation substrate 125 can protect the organic light-emitting diode of the pixel unit 123 from moisture, oxygen, and external influences. For example, the encapsulation substrate 125 can be made of a material having a high modulus of approximately 200 to 900 MPa. The encapsulation substrate 125 can be made from a metal material that has high corrosion resistance and can be easily processed in the form of a foil or a thin layer, such as aluminum (Al), nickel (Ni), chromium (Cr) and an alloy material of iron (Fe) and nickel.Therefore, since the encapsulation substrate 125 is made of a metal material, the encapsulation substrate can be designed as an ultra-thin layer and can provide strong resistance to external impacts and scratches.

[0110] A first adhesion layer AD1 can be positioned between the encapsulation layer 124 and the encapsulation substrate 125. The first adhesion layer AD1 can bond the encapsulation layer 124 and the encapsulation substrate 125 together. The first adhesion layer AD1 is formed from a material exhibiting adhesive properties and can be a thermosetting or naturally curing adhesive material. For example, the first adhesion layer AD1 can be formed from, but is not limited to, an optically clear adhesive (OCA) or a pressure-sensitive adhesive (PSA).

[0111] The first adhesion layer AD1 can be arranged to enclose the encapsulation layer 124 and the pixel unit 123. This means that the pixel unit 123 can be sealed by means of the buffer layer 122 and the encapsulation layer 124, and the encapsulation layer 124 and the pixel unit 123 can be sealed by means of the buffer layer 122 and the first adhesion layer AD1. The first adhesion layer AD1, together with the encapsulation layer 124 and the encapsulation substrate 125, can protect the organic light-emitting diode of the pixel unit 123 from moisture, oxygen, and external influences. In this case, the first adhesion layer AD1 can further comprise an absorbent. The absorbent can consist of hygroscopic particles that absorb moisture and oxygen from the outside to minimize the penetration of moisture and oxygen into the pixel unit 123.

[0112] A second adhesive layer AD2 can be arranged between the encapsulation substrate 125 and the first back cover 110a. The second adhesive layer AD2 can bond the encapsulation substrate 125 and the first back cover 110a together. The second adhesive layer AD2 is formed from a material exhibiting adhesive properties and can be a thermosetting or a naturally curing adhesive. For example, the second adhesive layer AD2 can be formed from, but is not limited to, an optically clear adhesive (OCA) or a pressure-sensitive adhesive (PSA).

[0113] Although in Fig. As shown in Figure 6, the majority of openings 111 of the first back cover 110a are not filled with the second adhesion layer AD2. The second adhesion layer AD2 can be filled into some or all of the majority of openings 111 of the first back cover 110a. If the second adhesion layer AD2 is filled into the majority of openings 111 of the first back cover 110a, the contact area between the second adhesion layer AD2 and the first back cover 110a is increased, thus preventing a separation phenomenon between the second adhesion layer AD2 and the first back cover 110a.

[0114] Referring to Fig. 7 and Fig. In sections 8A to 8D, the second adhesive layer AD2 cannot be applied to the pad area where the majority of flexible layers 130 are attached. Furthermore, the third support area PA3 of the second back cover 110b can be attached to a lower side of the display panel 120 by means of the third adhesive layer AD3.

[0115] The second adhesion layer AD2 and the third adhesion layer AD3 may have a double-sided adhesive tape.

[0116] Although not shown in the drawing, a polarizing plate can be arranged on a rear surface of the display panel 120. The polarizing plate selectively allows light to pass through in order to reduce the reflection of external light incident on the display panel 120. In particular, the display panel 120 can have various metallic materials applied to the semiconductor element, the wiring, the organic light-emitting diode, and the like. Therefore, the external light incident on the display panel 120 can be reflected by the metallic material, so that the visibility of the display device 100 can be reduced due to the reflection of external light. Therefore, when the polarizing plate is arranged, it suppresses the reflection of external light to increase the visibility of the display device 100 outdoors.However, the polarization plate can be omitted depending on the implementation form of the display device 100.

[0117] Referring to Fig. 7 and Fig. 8A to 8D, a portion of the plurality of flexible layers 130 can be arranged in the second support area PA2 of the first back cover 110a and the third support area PA3 of the second back cover 110b. The plurality of flexible layers 130 are layers in which various components are arranged on a base layer exhibiting deformability and supply a signal to the plurality of subpixels and the driver circuits that set up the plurality of pixels of the display area AA, and are electrically connected to the display panel 120. One end of the plurality of flexible layers 130 is arranged in the non-display area NA of the display panel 120 to supply a supply voltage or a data voltage to the plurality of subpixels and the driver circuits of the display area AA. The number of the plurality of flexible layers 130 can vary depending on the configuration and is not limited thereto.

[0118] A driver IC, such as a gate driver IC or a data driver IC, can be arranged on the majority of flexible layers 130. The driver IC is a component that handles data for displaying images and a control signal for processing the data. Depending on the mounting method, the driver IC can be arranged using a chip-on-glass (COG), chip-on-film (COF), adhesive tape carrier (TCP), or similar. For the sake of simplicity, however, it is described that the driver IC is mounted on the majority of flexible layers 130 using a chip-on-film technique, but this is not the only option.

[0119] This means that the printed circuit board 140 is arranged in the second deformable area MA2 of the first back cover 110a such that it is coupled to the majority of flexible layers 130. The printed circuit board 140 is a component that supplies signals to the control IC. Various components can be arranged in the printed circuit board 140 to supply different signals, such as a control signal or a data signal, to the control IC. The number of printed circuit boards 140 can vary depending on the configuration and is not limited therein.

[0120] Although in Fig. Figure 7 not shown, an additional printed circuit board connected to printed circuit board 140 may also be arranged. For example, printed circuit board 140 may be referred to as a source printed circuit board (S-PCB) on which the data driver is mounted, and the additional printed circuit board connected to printed circuit board 140 may be referred to as a control printed circuit board (C-PCB) on which the timing control is mounted. For example, the additional printed circuit board may be arranged inside reel 171, outside reel 171 in housing unit HP, or in direct contact with printed circuit board 140.

[0121] Referring to Fig. 7 and Fig. According to the present disclosure, the display unit DP can have the cover unit 150 in 8A to 8D.

[0122] The cover unit 150 according to the exemplary embodiment of the present disclosure is attached to the back surface of the first back cover 110a rather than to the front surface of the display panel 120 in order to implement the back bonding of the flexible layer 130. The first back cover 110a supports only an area corresponding to the display area AA, and the second back cover 110b supports an area from the wiring area at the lower end of the display area AA.

[0123] This means that, according to the present disclosure, in the large-format rollable display device 100, while the position of the cover unit 150 is changed, the fastening position of the majority of flexible layers 130 and the circuit board 140 is changed such that the majority of flexible layers 130 are fixed.

[0124] In the related technique, when the display panel is rolled up, the flexible layers are also repeatedly rolled up, so that, taking into account that tensile stress is created in the flexible layer until it is rolled up, the flexible layers are bent for fastening. However, the circuit board is bent and the cable is pulled, so that tensile stress is created in the flexible layer, causing the break in the pad area.

[0125] Accordingly, as disclosed, the cover unit 150 is arranged on the back surface of the first back cover 110a. The back cover 110a supports only an area corresponding to the display area AA of the display panel 120, and the second back cover 110b supports an area extending from the wiring area at the lower end of the display area AA. Therefore, back bonding of the flexible layer 130 can be implemented, and the springback effect that occurs when the end of the display panel 120 is rolled up can be reduced. This means that the cover unit 150 is fixed to the back surface of the first back cover 110a, and the flexible layer 130 can be fixed within the cover unit 150 after back bonding.As a result, the display panel 120 can remain flat even during repeated winding and unwinding, and the majority of flexible layers 130 also retain the same shape, so that the breakage of the pad area due to the tensile stress of the flexible layer 130 can be improved.

[0126] Furthermore, according to the present disclosure, a shape of the outer circumferential surface of the cover unit 150 forms an arc, and the bottom surfaces 152a and 152b form a surface that is curved in two planes such that they correspond to the first flat section 171Fa and the second flat section 171Fb of the roll 171. This means that the bottom surfaces 152a and 152b are formed by means of a first bottom surface 152a corresponding to the first flat section 171Fa and a second bottom surface 152b corresponding to the second flat section 171Fb.

[0127] Referring to Fig. 7 and Fig. In Figures 8A to 8D, the cover unit 150 of the present disclosure is arranged in the second support area PA2 and the second deformable area MA2 of the first back cover 110a such that a portion of the plurality of flexible layers 130 and the printed circuit board 140 are accommodated. The cover unit 150 of the present disclosure accommodates the printed circuit board 140 for the purpose of protecting the printed circuit board 140.

[0128] The cover unit 150 of the present disclosure can be partially attached to the rear surface of the second support area PA2 of the first rear cover 110a in such a way that it is fixed, but is not limited to this. For this purpose, the third fastening hole can be formed in the second support area PA2 of the first rear cover 110a. The cover unit 150 can be attached to the first rear cover 110a by means of the third fastening hole.

[0129] The cover unit 150 according to the present disclosure has a base plate 151 and a cover plate 153.

[0130] The base plate 151 is bent in two planes, i.e., the first bottom surface 152a and the second bottom surface 152b of the cover plate 153, such that it is positioned on the back surface of the printed circuit board 140. The base plate 151 can be fixed to the cover plate 153 of the cover unit 150 on a surface opposite a surface of the first back cover 110a, on which the display panel 120 is not positioned, i.e., on the back surface. Therefore, the base plate 151 of the cover unit 150, together with the cover plate 153, can support the printed circuit board 140. For example, the base plate 151 for supporting the printed circuit board 140 is flat and made of a material that has stiffness, but is not limited to this.

[0131] The cover plate 153 is arranged on the rear surface of the first rear cover 110a.

[0132] The cover plate 153 can be arranged on the rear surface of the first rear cover 110a.

[0133] The cover plate 153 can be arranged to cover the printed circuit board 140, which is located in the second deformable area MA2 of the first back cover 110a, and can have a convex shape. This means that one surface of the cover plate 153 can be formed as a curved surface. The cover plate 153 is formed from a material that has stiffness to protect the printed circuit board 140, but is not limited to this. The first bottom surface 152a and the second bottom surface 152b of the cover plate 153 can form a surface that is curved in two planes.

[0134] Furthermore, the cover unit 150 can maintain its original state without bending when the display unit DP is wound up to protect the majority of flexible layers 130 and the printed circuit board 140. In particular, when the display unit DP is wound up, the base plate 151 of the cover unit 150, which has the stiffness , maintains a flat state without bending to protect the printed circuit board 140. A portion of the roll 171 around which the base plate 151 is wound can be formed as a deformable area so that the base plate 151 is not bent. The roll 171 is configured by means of a first flat section 171Fa, a second flat section 171Fb, and a bent section 171R, and the base plate 151 is bent in two planes such that it rests on the first flat section 171Fa and the second flat section 171Fb, respectively.Therefore, although the display unit DP is wound up, the base plate 151 can be kept flat without being bent.

[0135] Next, when the display unit DP is wound up, the cover plate 153 of the cover unit 150, which has the necessary rigidity to protect the majority of flexible layers 130 and the printed circuit board 140, can maintain its original convex shape without deformation. The cover plate 153, which has a convex shape, can form a circular shape together with the curved section 171R of the roll 171. For example, the first bottom surface 152a and the second bottom surface 152b of the base plate 151, which has a convex shape, form a surface curved in two planes and sit on the first flat section 171Fa and the second flat section 171Fb of the roll 171 corresponding to these, in order to form an essentially circular shape together with the curved area 171R of the roll 171.Accordingly, the cover unit 150 and the roller 171 essentially form a circular shape, and a portion of the display panel 120 wound onto the cover unit 150 can be wound with a larger radius of curvature, thus reducing the load acting on the display panel 120.

[0136] When the cover unit is positioned on the front surface of the back cover, the wiring area corresponds to a 25R section. In contrast, according to the present disclosure, the cover unit 150 is positioned on the back surface of the back cover 110, so that the wiring area meets the cover unit 150 at a 40R angle. Furthermore, in the related technology, because the printed circuit board and the display panel are rolled up, the angle of the majority of flexible layers changes significantly, so that the majority of flexible layers can be detached. In contrast, according to the present disclosure, the angle of the majority of flexible layers 130 and the printed circuit board 140 and the display panel 120 hardly changes, and the angle of the majority of flexible layers 130 and the printed circuit board 140 can be fixed by means of the base plate 151.

[0137] The following describes the process of winding the display unit DP around the roller 171 with reference to Fig. Sections 9A to 9D will be described in detail. < Winding process of back cover and display panel >

[0138] Fig. Figures 9A to 9D are cross-sectional views corresponding to a control state of a display device according to an exemplary embodiment of the present disclosure.

[0139] Fig. 9A is a cross-sectional view showing a state in which the back cover 110 is fully unwound from the roll 171. Fig. 9B is a cross-sectional view showing a state in which the fourth support area PA4 and the third deformable area MA3 of the second back cover 110b are wound around the roll 171. Fig. 9C is a cross-sectional view showing a state in which the fourth support area PA4, the third deformable area MA3 and the third support area MA3 of the second back cover 110b and the second support area PA2 and the second deformable area MA2 of the first back cover 110a are wound around the roll 171. Fig. 9D is a cross-sectional view showing a state in which the fourth support area PA4, the third deformable area MA3 and the third support area PA3 of the second back cover 110b and the second support area PA2, the second deformable area MA2 and the first deformable area MA1 of the first back cover 110a are wound around the roll 171.

[0140] Referring to Fig. In 9A, the roller 171 is completely cylindrical, but part of it is flat. For example, part of an outer circumferential surface of the roller 171 is provided by a first flat section 171Fa and a second flat section 171Fb, which are formed such that they are flat, and the remaining part of the outer circumferential surface is provided by a curved section 171R, which is formed with a curved surface. This means, for example, that the second flat section 171Fb can extend from one end of the first flat section 171Fa, and the curved section 171R can extend from the other end of the first flat section 171Fa toward the second flat section 171Fb.In this case, the second flat section 171Fb is an area in which the majority of flexible layers 130 are substantially arranged, and the first flat section 171Fa is an area in which the printed circuit board 140 is arranged. Therefore, to accommodate the printed circuit board 140, which is relatively larger, the size and area of ​​the first flat section 171Fa can be larger than the size and area of ​​the second flat section 171Fb. Furthermore, the length of the first flat section 171Fa with respect to a direction perpendicular to the longitudinal direction of the roll 171 can also be greater than that of the second flat section 171Fb.

[0141] The fourth support area PA4 of the second back cover 110b can be attached to either the first flat section 171Fa or the second flat section 171Fb of the roll 171. For example, the fourth support area PA4 can be attached to the first flat section 171Fa of the roll 171, and the fourth support area PA4 can be attached to the second flat section 171Fb of the roll 171. Apart from the fourth support area PA4 attached to the roll 171, the remaining portion of the second back cover 110b extending from the fourth support area PA4 can be flat. Hereinafter, it is assumed that the fourth support area PA4 of the second back cover 110b is attached to the second flat section 171Fb, but this is not the limit.

[0142] As described above, when the back cover 110 is fully unwound, the fourth support area PA4, the third deformable area MA3, the third support area PA3, and the second deformable area MA2 of the back cover 110 can be located inside the housing unit HP. Furthermore, the first support area PA1 and the first deformable area MA1 can be located on the outside of the housing unit HP. Therefore, the display panel 120 can be located on the outside of the housing unit HP in such a way that the image can be displayed, and the majority of the flexible layers 130 and the printed circuit board 140 can be located on the inside of the housing unit HP so that they are not visible.

[0143] Next, with reference to Fig. 9B, the fourth support area and the third deformable area MA3 wound around the roll 171, and the third support area PA3 extending from the third deformable area MA3, and the second support area PA2, the second deformable area MA2, the first deformable area MA1 and the first support area PA1 of the first back cover 110a are unwound.

[0144] The fourth support area PA4 can be wound in the second flat section 171Fb of the roll 171, and part of the third deformable area MA3 can be wound in the first flat section 171Fa. The remaining part of the third deformable area MA3 can be wound in the curved section 171R.

[0145] Next, with reference to Fig. 9C, the fourth support area PA4, the third deformable area MA3, the third support area PA3, the second deformable area MA2 and the second support area PA2 wound around the roll 171, and the first deformable area MA1 and the first support area PA1 extending from the second deformable area MA2 are unwound.

[0146] The second support area PA2 can be wound on the second flat section 171Fb of the roll 171 on which the fourth support area PA4 is wound, and the second deformable area MA2 can be wound on the first flat section 171Fa on which part of the third deformable area MA3 is wound, but is not limited to this.

[0147] When the second support area PA2 and the second deformable area MA2, in which the cover unit 150 is arranged, are wound around the roller 171, the curved section 171R of the roller 171 and the cover unit 150 can form a circular shape.

[0148] The second support area PA2, in which the majority of flexible layers 130 are arranged, is wound onto the second flat section 171Fb of the roll 171, so that at least a part of the majority of flexible layers 130 and of the second support area PA2 can be maintained in such a way that it is flat.

[0149] The second deformable area MA2, in which the circuit board 140 and part of the cover unit 150 are arranged, can be wound on the first flat section 171Fa of the roll 171.

[0150] Accordingly, at least a portion of the majority of flexible layers 130 can be maintained in such a way that they are flat, regardless of whether the display unit DP is wound or unwound, and the damage caused when the majority of flexible layers 130 are bent can be minimized.

[0151] In order to wind the second support area PA2 onto the second flat section 171Fb, the first back cover 110a can be arranged to be bent at a boundary of the second support area PA2.

[0152] Referring to Fig. 9D represents the fourth support area PA4, the third deformable area MA3, the third support area PA3, the second deformable area MA2, the second support area PA2, and part of the first deformable area MA1 wound around the roll 171. In contrast, the remaining part of the first deformable area MA1 and the first support area PA1 are unwound.

[0153] For example, part of the first deformable area MA1 is wound onto the second flat section 171Fb of the roll 171, on which the fourth support area PA4 and the second support area PA2 are wound. The other part of the first deformable area MA1 is wound onto the first flat section 171Fa, on which the third deformable area MA3 and the second deformable area MA2 are wound. Furthermore, another part of the first deformable area MA1 can be wound onto the curved section 171R, on which the third deformable area MA3 is wound.

[0154] The first deformable area MA1 can be wound in a substantially circular shape. In particular, the first bottom surface 152a and the second bottom surface 152b of the base plate 151, which has a convex shape, form a flat surface curved in two planes and sit on the first flat section 171Fa and the second flat section 171Fb of the roll 171 corresponding to them, such that together with the curved section 171R of the roll 171, they form a substantially circular shape. Accordingly, the cover unit 150 and the roll 171 form a substantially circular shape, and a portion of the first deformable area MA1 wound on the cover unit 150 can be wound while forming a substantially circular shape.

[0155] The roller 171 according to the exemplary embodiment of the present disclosure is configured by means of the first flat section 171Fa, the second flat section 171Fb, and the curved section 171R. Furthermore, the radius of curvature at the boundary of the first flat section 171Fa and the second flat section 171Fb is smaller than the radius of curvature of the curved section 171R. Additionally, the radius of curvature at the boundary of the first flat section 171Fa and the curved section 171R, and the radius of curvature at the boundary of the second flat section 171Fb and the curved section 171R, can also be smaller than the radius of curvature of the curved section 171R. The radius of curvature indicates a degree of curvature, such that the larger the radius of curvature, the closer it gets to a flat surface.Therefore, a portion of the display unit DP, located at the boundary between the first flat section 171Fa and the second flat section 171Fb, the boundary between the first flat section 171Fa and the curved section 171R, and the boundary between the second flat section 171Fb and the second curved section 171R, is more bent than the remaining portion of the display unit DP, which is wound onto the first flat section 171Fa, the second flat section 171Fb, and the curved section 171R. This allows for a greater stress to act upon it. When the display unit DP is fully wound, the first deformable area MA1 of the first back cover 110a and the display panel 120 can be wound onto the first flat section 171Fa, the second flat section 171Fb, and the curved section 171R.Since the back cover 110 is made of a rigid material, it is not easily broken even under stress. In contrast, the display panel 120 can be easily broken due to the increased stress caused by its small radius of curvature.

[0156] Therefore, in the display device 100 according to the exemplary embodiment of the present disclosure, if the display unit DP is wound with an increased radius of curvature in which the display panel 120 is wound, the load acting on the display panel 120 can be reduced. In particular, the second back cover 110b is wound around the roll 171 from the fourth support area PA4 under the second back cover 110b, such that the fourth support area PA4, the third deformable area MA3, the third support area PA3, the second deformable area MA2, and the second support area PA2 of the back cover 110 are wound around the roll 171.The first deformable area MA1 of the first back cover 110a and the display panel 120 can then be wound onto the fourth support area PA4, the third deformable area MA3, the third support area PA3, the second deformable area MA2, and the second support area PA2. This means that the cover unit 150, on which the second deformable area MA2 of the first back cover 110a is wound, is wound onto the reel 171, and then the first deformable area MA1 of the first back cover 110a and the display panel 120 can be wound onto the cover unit 150. One surface of the cover plate 153 of the cover unit 150 is formed as a curved surface. Therefore, when the cover unit 150 is wound around the reel 171, the cover plate 153 and the curved section 171R can form an essentially circular shape.Therefore, the display panel 120 is wound onto the cover unit 150 and the curved section 171R, so that when the display unit DP is wound up, the load acting on the display panel 120 can be reduced. This means that the display panel 120 is not bent with a relatively small radius of curvature at the boundary between the first flat section 171Fa and the second flat section 171Fb, the boundary between the first flat section 171Fa and the curved section 171R, and the boundary between the second flat section 171Fb and the curved section 171R. However, the display panel 120 is bent with a relatively large radius of curvature on the cover unit 150 and the curved section 171R, so that the load acting on the display panel 120 can be reduced just as much.Therefore, the cover plate 153, which has a radius of curvature corresponding to the curved section 171R, is arranged according to the exemplary embodiment of the present disclosure, so that the display panel 120 can be curved with a relatively large radius of curvature, and the load acting on the display panel 120 can be reduced.

[0157] In the display device 100 according to the exemplary embodiment of the present disclosure, the plurality of flexible layers 130 and the printed circuit board 140 are arranged in the second support area PA2 and the second deformable area MA2 of the first back cover 110a. Furthermore, the cover unit 150, which accommodates the plurality of flexible layers 130 and the printed circuit board 140, is arranged. Therefore, damage to the plurality of flexible layers 130 and the printed circuit board 140 can be minimized. In particular, when the display unit DP is wound around the roll 171, the back cover 110 can be wound while bent in accordance with the shape of the roll 171. However, when the plurality of flexible layers 130 and the printed circuit board 140 are bent in accordance with the shape of the roll 171, stress can be exerted on the plurality of flexible layers 130 and the printed circuit board 140.In particular, the printed circuit board 140, which is made of a hard material, can break. In this case, the second support area PA2 is an area in which the majority of openings 111 are not arranged, and a flat state is always maintained, supporting the majority of flexible layers 130 arranged in the second support area PA2 in such a way that they are kept in a flat state. Here, the cover unit 150, which is made of a material having a stiffness, is arranged such that it protects the majority of flexible layers 130 and the printed circuit board 140. Furthermore, a portion of the roll 171, onto which the second support area PA2 and the second deformable area MA2 are wound, is formed by means of the first flat section 171Fa and the second flat section 171Fb, so that the second support area PA2 can be wound flat around the roll 171.Therefore, the second support area PA2 can maintain its flat state even though it is wound around the reel 171, and the majority of flexible layers 130 arranged in the second support area PA2 can likewise maintain their flat state. For example, when the display unit DP is fully wound, the majority of flexible layers 130 and the printed circuit board 140 rest on the first flat section 171Fa and the second flat section 171Fb of the reel 171 in such a way that a flat state is maintained. Furthermore, the cover unit 150 is arranged to cover the majority of flexible layers 130 and the printed circuit board 140, so that even if other structures of the display unit DP are wound onto the majority of flexible layers 130 and the printed circuit board 140, they do not affect the majority of flexible layers and the printed circuit board 140.Therefore, in the display device 100 according to the exemplary embodiment of the present disclosure, the plurality of flexible layers 130, the printed circuit board 140, and the cover unit 150 are arranged in the second support area PA2 and the second deformable area MA2. As a result, it is possible to maintain the plurality of flexible layers 130 in such a flat position and to protect the plurality of flexible layers from external influences. Furthermore, in the display device 100 according to the exemplary embodiment of the present disclosure, the first flat section 171Fa and the second flat section 171Fb, which are flat, are formed on a portion of the outer circumferential surface of the roller 171. Therefore, the plurality of flexible layers 130 and the printed circuit board 140 are not bent, and damage to the plurality of flexible layers 130 and the printed circuit board 140 can be minimized.Furthermore, in the display device 100 according to the exemplary embodiment of the present disclosure, the majority of flexible layers 130 and the circuit board 140 can be fixed by means of the cover unit 150 so that they are not bent.

[0158] In the display device 100 according to the exemplary embodiment of the present disclosure, the first flat section 171Fa and the second flat section 171Fb of the roll 171, on which the plurality of flexible layers 130 and the printed circuit board 140 are respectively mounted, are formed separately. Therefore, a degree of flexibility in the design of the plurality of flexible layers 130 and the printed circuit board 140 can be ensured. Compared to a case in which a flat section on which the plurality of flexible layers 130 and the printed circuit board 140 are mounted is formed on the roll 171, if the first flat section 171Fa, on which the plurality of flexible layers 130 are mounted, and the second flat section 171Fb, on which the printed circuit board 140 is mounted, are formed separately, the size of the area in which the plurality of flexible layers 130 and the printed circuit board 140 are arranged can be increased.

[0159] The following describes a form of role 171 according to the present disclosure with reference to Fig. 10A and Fig. 10B will be described in more detail. < Form of role >

[0160] Fig. Figure 10A is a schematic cross-sectional view of a roll according to a comparative design form.

[0161] Fig. Figure 10B is a schematic cross-sectional view of a roller according to an exemplary embodiment of the present disclosure.

[0162] Fig. Figure 10A is a cross-sectional view of a roller 71' of a display device according to a comparative embodiment. Fig. Figure 10B is a cross-sectional view of a roller 171 of a display device according to an exemplary embodiment.

[0163] In comparison to the roller 171 of the display device 100 according to the exemplary embodiment of the present disclosure, in a roller 71' of the display device according to the comparative embodiment of the Fig. 10A only a flat section 71F' is arranged. The roller 171 of the display device according to the exemplary embodiment of the Fig. 10B has the same structure as the roller 171 of the display device 100 according to the exemplary embodiment of the present disclosure.

[0164] Referring to Fig. 10A and Fig. Furthermore, a torsion spring TS' and a torsion spring TS can be arranged in the roller 71' and the roller 171 to rotate the roller 71' and the roller 171. The torsion spring TS and the torsion spring TS' are arranged in the roller 71' and the roller 171 to supply an additional force to the roller 71' and the roller 171 when the display unit DP is wound up. Furthermore, a predetermined space is required in the roller 71' and the roller 171 to accommodate the torsion spring TS' and the torsion spring TS.

[0165] Referring to Fig. In 10A, the roller 71' is configured according to the comparative embodiment by means of a flat section 71F' and a curved section 71R'. When the display unit is wound on, the majority of the flexible layers and the printed circuit board can rest on the flat section 71F'. In this case, the flat section 71F' can be shaped such that it does not interfere with the torsional spring TS' in the roller 71'.

[0166] If a flat section 71F' is formed such that it does not impede the torsional spring TS', the maximum length of the flat section 71F' can be a first length D1. The length from one end of the plurality of flexible layers to the other end of the printed circuit board can be equal to or less than the first length D1. In particular, when the display unit is wound up, the plurality of flexible layers and the printed circuit board must rest on the flat section 71F' so that damage to the plurality of flexible layers and the printed circuit board is minimized. Accordingly, the plurality of flexible layers and the printed circuit board must be designed such that the sum of the lengths of the plurality of flexible layers and the length of the printed circuit board does not exceed the first length D1.

[0167] In contrast, with reference to Fig. 10B, the reel 171 is configured according to the exemplary embodiment by means of the first flat section 171Fa, the second flat section 171Fb, and the curved section 171R. When the display unit DP is wound on, the majority of flexible layers 130 can rest on the first flat section 171Fa, and the printed circuit board 140 can rest on the second flat section 171Fb. The first flat section 171Fa and the second flat section 171Fb can be formed such that they do not interfere with the torsional spring TS in the reel 171.

[0168] If the first flat section 171Fa and the second flat section 171Fb are configured such that they do not interfere with the torsional spring TS, the total length of the first flat section 171Fa and the second flat section 171Fb can be a second length D2, which is greater than the first length D1. The length from one end of the plurality of flexible layers 130 to the other end of the printed circuit board 140 can be equal to or less than the second length D2. The length of the plurality of flexible layers 130 can be configured such that it is equal to or less than the length of the first flat section 171Fa, and the length of the printed circuit board 140 can be configured such that it is equal to or less than the second flat section 171Fb.

[0169] In role 71' according to the comparative execution form of the Fig. 10A is only a flat section 71F' formed, and in the roll 171 according to the exemplary embodiment of the Fig. 10B consists of two flat sections, for example the first flat section 171Fa and the second flat section 171Fb. In this case, roll 71' and roll 171 of the Fig. 10A and the Fig. 10B The flat section 71F', the first flat section 171Fa, and the second flat section 171Fb are formed such that they do not interfere with the torsion spring TS' and the torsion spring TS. To prevent interference with the torsion spring TS', it may be difficult for the roller 71' according to the comparative embodiment to extend the length of the flat section 71F' to a predetermined level or higher. In contrast, in the roller 171 according to the exemplary embodiment, two flat sections, i.e., the first flat section 171Fa and the second flat section 171Fb, are formed such that, compared to the comparative embodiment, the total area of ​​the flat sections 171Fa and 171Fb can be increased.Accordingly, in the roll 171 according to the exemplary embodiment, compared to the roll 71' according to the comparative embodiment, the area in which the majority of flexible layers 130 and the printed circuit board 140 can be arranged can be improved.

[0170] Furthermore, in the roll 71' according to the comparative embodiment, to ensure that the area of ​​the flat section 71F' in which the majority of flexible layers and the printed circuit board of the related technology are arranged, the majority of flexible layers and the printed circuit board can be designed such that the sizes of the majority of flexible layers and the printed circuit board are reduced. Furthermore, the area of ​​the flat section 71F' can be improved by increasing the diameter of the roll 71'.

[0171] In contrast, in the exemplary embodiment of the roll 171, the first flat section 171Fa and the second flat section 171Fb are designed such that they easily provide the area for arranging the plurality of flexible layers 130 and the printed circuit board 140. Therefore, in the exemplary embodiment of the roll 171, the plurality of flexible layers 130 and the printed circuit board 140 can be designed such that their sizes can be reduced. Furthermore, the plurality of flexible layers 130 and the printed circuit board 140 can be arranged without increasing the diameter of the roll 171.

[0172] Accordingly, in the display device 100 according to the exemplary embodiment of the present disclosure, two flat sections, i.e., the first flat section 171Fa and the second flat section 171Fb, are formed to improve the design flexibility of the plurality of flexible layers 130 and the printed circuit board 140. As shown from Fig. 10A and Fig. As can be seen in Figure 10B, two flat sections, such as the first flat section 171Fa and the second flat section 171Fb, are formed in the roll 171 according to the exemplary embodiment to ensure sufficient space for the placement of the plurality of flexible layers 130 and the printed circuit board 140, irrespective of the constraint due to the torsional spring TS. Therefore, a redesign process to reduce the size of the plurality of flexible layers 130 and the printed circuit board 140 can be simplified, and the increase in the diameter of the roll 171 is likewise minimized, so that the volume of the fully wound display device 100 can be minimized.Accordingly, in the display device 100 according to the exemplary embodiment of the present disclosure, the first flat section 171Fa, in which the plurality of flexible layers 130 are arranged, and the second flat section 171Fb, in which the printed circuit board 140 is arranged, are formed separately. As a result, the size of the area in which the plurality of flexible layers 130 and the printed circuit board 140 are arranged can be increased, and the design flexibility of the plurality of flexible layers 130 and the printed circuit board 140 can be ensured. < Attaching the display device >

[0173] Fig. 11A and Fig. Figure 11B are perspective views illustrating the attachment of a first rear cover and a display panel in a display device according to an exemplary embodiment of the present disclosure.

[0174] Fig. 11A represents a state before the first rear cover 110a and the display panel 120 are attached, and Fig. 11B represents a state after the first rear cover 110a and the display panel 120 have been attached.

[0175] Referring to Fig. 11A and Fig. 11B, if the screen direction in which an image is displayed is a right side, the first rear cover 110a can be attached to the display panel 120 from the left side.

[0176] In this case, although not shown for convenience, the majority of flexible layers 130 on the back surface can be electrically connected to the display panel 120. The back surface of the display panel 120 can be a surface opposite the screen direction. A driver IC, such as a gate driver IC or a data driver IC, can be placed on the majority of flexible layers 130.

[0177] Furthermore, the printed circuit board 140 can be connected to the majority of flexible layers 130. The printed circuit board 140 is a component that supplies signals to the control IC. Various components can be arranged in the printed circuit board 140 to supply different signals, such as a control signal or a data signal, to the control IC.

[0178] As described above, when the majority of flexible layers 130 and the printed circuit board 140 are attached to the back surface of the display panel 120, this is referred to as back bonding.

[0179] In this case, a second adhesive layer AD2 can be inserted between the first back cover 110a and the display panel 120.

[0180] In the present disclosure, the second adhesive layer AD2 may not be applied in the wiring lead area and the pad area. According to the related technology, the second adhesive layer is applied to the back cover and the front surface of the display panel, so that when the back cover is wound around the roll, the display panel is wound around the roll. However, if the second adhesive layer AD2 is not applied to the wiring lead area and the pad area, as described in the present disclosure, a portion of the display panel, i.e., the wiring lead area and the pad area, may remain flat even though the first back cover 110a, corresponding to the relevant section, is wound around the roll 171.

[0181] The second adhesion layer AD2 may only not be applied to the lower end of the display area AA, so that the wiring lead area and the pad area are not visible to the naked eye from the front surface.

[0182] The second adhesion layer AD2 may have a double-sided adhesive tape.

[0183] Fig. 12A and Fig. Figure 12B are perspective views showing the attachment of a first rear cover and a head rod in a display device according to an exemplary embodiment of the present disclosure.

[0184] Fig. 12A represents a state before the first rear cover 110a and the headstock 182 are attached, and Fig. 12B represents a state after the first rear cover 110a and the head bar 182 have been attached.

[0185] Referring to Fig. 12A and Fig. 12B, after the first back cover 110a is attached to the display panel 120, the head bar 182 can be attached to the top of the first back cover 110a.

[0186] The head rod is coupled to the connecting unit 181 in such a way that the display unit DP is moved vertically in accordance with the rotation of the majority of connections 181a and 181b of the connecting unit 181. This means that the display unit DP can be moved vertically by means of the head rod 182 and the connecting unit 181.

[0187] The head bar 182 covers only a portion of a surface adjacent to the top edge of the display unit DP, so that an image displayed on the top surface of the display unit DP is not obscured. The display unit DP and the head bar 182 can be fixed by means of a screw, but this is not the only possible method.

[0188] Fig. Figure 13 is a perspective view showing the attachment of a second rear cover and a display panel in a display device according to an exemplary embodiment of the present disclosure.

[0189] Referring to Fig. 13 After the head rod 182 is attached to an upper end of the first rear cover 110a, the second rear cover 110b can be attached to a perimeter area of ​​a lower end of the display panel 120 by means of a third adhesive layer AD3.

[0190] The third adhesion layer AD3 may have a double-sided adhesive tape.

[0191] The third adhesion layer AD3 can be applied to the wiring lead area and the pad area of ​​the display panel 120.

[0192] Fig. Figure 14 is a perspective view showing the attachment of a second rear cover and a display panel and a housing unit in a display device according to an exemplary embodiment of the present disclosure.

[0193] Referring to Fig. 14. After the second rear cover 110b is attached to the display panel 120, the cover unit 150 can be attached to the rear surface of the display panel 120.

[0194] The cover unit 150 is positioned on the rear surface of the first rear cover 110a rather than on the front surface of the display panel 120 to implement the back bonding of the flexible layer 130 and the printed circuit board 140. The first rear cover 110a supports only an area corresponding to the display area AA, and the second rear cover 110b supports an area starting from the wiring lead area at the bottom of the display area AA.

[0195] The cover unit 51 according to the present disclosure comprises a base plate 151 and a cover plate 153.

[0196] The base plate 151 is curved in two planes, i.e., the first bottom surface 152a and the second bottom surface 152b of the cover plate 153, such that it is positioned on the back surface of the printed circuit board 140. The base plate 151 can be fixed to the cover plate 153 of the cover unit 150 on the back surface of the first back cover 110a, on which the display panel 120 is not positioned. Therefore, the base plate 151 of the cover unit 150, together with the cover plate 153, can protect the printed circuit board 140. For example, the base plate 151 is made of a material that has sufficient rigidity to support the printed circuit board 140 in such a way that it remains flat, but is not limited to this.

[0197] The cover plate 153 is arranged on the rear surface of the first rear cover 110a.

[0198] The cover plate 153 is arranged to cover the printed circuit board 140, which is located in the second deformable area MA2 of the first back cover 110a, and may have a convex shape. This means that one surface of the cover plate 153 may be formed as a curved surface. The cover plate 153 is made of a material that has the necessary rigidity to protect the printed circuit board 140, but is not limited to this purpose. The first bottom surface 152a and the second bottom surface 152b of the cover plate 153 may form a surface that is curved in two planes.

[0199] Furthermore, the cover unit 150 retains its original state without bending when the display unit DP is wound up, thus protecting the majority of flexible layers 130 and the printed circuit board 140. Specifically, when the display unit DP is wound up, the base plate 151 of the cover unit 150, which has the stiffness, maintains a flat state without bending to protect the printed circuit board 140. Additionally, a portion of the roll 171 around which the base plate 151 is wound can be formed as a flat surface, so that the base plate 151 is not bent. The roller 171 is provided by means of a first flat section 171Fa, a second flat section 171Fb and a curved section 171R, and the base plate 151 is bent in two planes such that it rests on the first flat section 171Fa and the second flat section 171Fb, respectively.Therefore, although the display unit DP is wound up, the base plate 151 can be kept flat without being bent.

[0200] Next, when the display unit DP is wound up, the cover plate 153 of the cover unit 150, which has the rigidity, retains an original convex shape without deformation to protect the majority of flexible layers 130 and the printed circuit board 140. The cover plate 153, which has a convex shape, can form a circular shape together with the curved section 171R of the roll 171. For example, the first bottom surface 152a and the second bottom surface 152b of the base plate 151, which has a convex shape, form a surface curved in two planes and sit on the first flat section 171Fa and the second flat section 171Fb of the roll 171 corresponding to them, to form an substantially circular shape together with the curved section 171R of the roll 171.Accordingly, the cover unit 150 and the roll 171 essentially form a circular shape, and a portion of the display panel 120 wound onto the cover unit 150 is wound with a larger radius of curvature, so that a load acting on the display panel 120 may be reduced.

[0201] The covering unit of the present disclosure can be divided into two structures, which are described in detail with reference to another exemplary embodiment of the present disclosure. <Exemplary embodiment in which a cover unit is subdivided>

[0202] Fig. Figure 15 is a cross-sectional view of a display device according to another exemplary embodiment of the present disclosure.

[0203] The only difference between the display device 1000 of the Fig. 15 and the display device 100 of the Fig. 4, Fig. 5, Fig. 6 to Fig. 7 is a cover unit, however other structures are essentially the same.

[0204] Referring to Fig. 15 The display unit DP has a rear cover 110, a display panel 120, a plurality of flexible layers 130, a printed circuit board 140 and a cover unit 1050 and a cover unit 1060.

[0205] The rear cover 110 according to another exemplary embodiment of the present disclosure is arranged on a rear surface (and on a front surface of part of a lower end) of the display panel 120 such that it supports the display panel 120, the plurality of flexible layers 130 and the printed circuit board 140.

[0206] A rear cover size of 110 can be larger than a display panel size of 120. The rear cover 110 can protect other structures of the display unit DP from the outside.

[0207] Although the rear cover 110 is formed from a material that has a rigidity, at least part of the rear cover 110 may have a flexibility to be wound up or unwound together with the display panel 120.

[0208] The rear cover 110 has a plurality of support areas PA and a plurality of deformable areas MA. The plurality of support areas PA are areas in which a plurality of openings 111 are not arranged, and the plurality of deformable areas MA are areas in which a plurality of openings 111 are arranged.

[0209] The rear cover 110 according to another exemplary embodiment of the present disclosure can comprise a first rear cover 110a and a second rear cover 110b. The rear cover 110 according to another exemplary embodiment of the present disclosure can be configured such that it is subdivided into the first rear cover 110a and the second rear cover 110b. For example, the rear cover 110 can be configured such that it is subdivided into the first rear cover 110a, which is arranged on a rear surface of the display panel 120 with respect to a lower end of the display panel 120, and the second rear cover 110b, which is arranged on a front surface of the display panel 120.

[0210] In this case, the first rear cover 110a can be attached to the head bar 182, and the second rear cover 110b can be attached to the roller 171.

[0211] The first back cover 110a has a first support area PA1, a first deformable area MA1, a second support area PA2 and a second deformable area MA2, but is not limited to this.

[0212] The second back cover 110b has a third support area PA3, a third deformable area MA3 and a fourth support area PA4, but is not limited to this.

[0213] Since the back cover 110 is wound or unwound in a slit direction, the majority of support areas PA and the majority of deformable areas MA can be arranged along the slit direction.

[0214] In the display device 1000 according to another exemplary embodiment of the present disclosure, the back cover 110 is configured by means of the first back cover 110a and the second back cover 110b, which are separate from one another to form the back cover 110, so that they correspond to different sizes of the display panel 120. Accordingly, the first back cover 110a and the second back cover 110b can perform all the functions of the back cover 110 of the related technology, and the back cover 110 can be manufactured to be smaller, so that the productivity of the back cover 110 can be improved.

[0215] In the first support area PA1, the second support area PA2, the third support area PA3, and the fourth support area PA4, the plurality of openings 111, as formed in the plurality of deformable areas MA, are not formed. Specifically, in the first support area PA1, the first fixing holes AH1 are formed, and in the fourth support area PA4, the second fixing holes AH2 are formed; however, the plurality of openings 111, as formed in the plurality of deformable areas MA, are not formed in the first support area PA1, the second support area PA2, the third support area PA3, and the fourth support area PA4. Furthermore, the first fixing holes AH1 and the second fixing holes AH2 may have different shapes than the plurality of openings 111.The first support area PA1 is an area fixed to the headstock 182, the second support area PA2 and the third support area PA3 are areas in which the flexible layers 130 are supported, and the fourth support area PA4 is an area fixed to the roller 171. Therefore, the support areas can have a stiffness that is greater than that of the majority of deformable areas MA.

[0216] Since the first support area PA1, the second support area PA2, the third support area PA3, and the fourth support area PA4 possess rigidity, the first support area PA1 and the fourth support area PA4 can be firmly fixed to the head bar 182 and the roller 171. Furthermore, the second support area PA2 and the third support area PA3 maintain the majority of the flexible layers 130 in such a way that they remain flat and are not bent, thus protecting the majority of the flexible layers 130. Therefore, the display unit DP is fixed to the roller 171 and the head bar 182 of the control unit MP in such a way that it moves to the inside or outside of the housing unit HP according to the movement of the control unit MP, thus protecting the majority of the flexible layers 130 and the printed circuit board 140.

[0217] Referring to Fig. 15. The display panel 120 can be arranged on a surface of the first back cover 110a. For example, the display panel 120 is arranged in the first deformable area MA1, on a surface of the first back cover 110a.

[0218] The Display Panel 120 is a panel for displaying images to a user. The Display Panel 120 can include a display element that shows images, a control element that controls the display element, and wiring lines that transmit various signals to the display element and the control element.

[0219] The display element can be defined in different ways depending on the type of display panel 120.

[0220] Since the display device 1000 according to another exemplary embodiment of the present disclosure is a rollable display device, the display panel 120 can be implemented as a flexible display panel that is to be wound around or unwound from the roll 171.

[0221] The second adhesive layer AD2 is positioned between the display panel 120 and the first back cover 110a. The second adhesive layer AD2 bonds the display panel 120 and the first back cover 110a together. The second adhesive layer AD2 is made of a material that exhibits adhesive properties and can be a thermally curing or naturally curing adhesive.

[0222] The second adhesive layer AD2 cannot be applied in the pad area where the majority of flexible layers 130 are attached. The third support area PA3 of the second back cover 110b can be attached to a lower side of the display panel 120 by means of the third adhesive layer AD3.

[0223] The second adhesion layer AD2 and the third adhesion layer AD3 may have a double-sided adhesive tape.

[0224] Referring to Fig. 15 A plurality of flexible layers 130 can be arranged in the second support area PA2 of the first back cover 110a. One end of the plurality of flexible layers 130 is arranged in the non-display area NA of the display panel 120 to supply a supply voltage, a data voltage or the like to the plurality of subpixels and the control circuits of the display area AA.

[0225] Furthermore, the circuit board 140 is arranged in the second deformable area MA2 of the first back cover 110a in such a way that it is coupled to the majority of flexible layers 130.

[0226] The display unit DP according to the present disclosure can have a cover unit 1050 and a cover unit 1060.

[0227] The cover unit 1050 and the cover unit 1060 according to another exemplary embodiment of the present disclosure are configured to be subdivided into a first cover unit 1060 and a second cover unit 1050. Furthermore, according to another exemplary embodiment of the present disclosure, the cover unit 1050 and the cover unit 1060 are arranged on the back surface of the first back cover 110a rather than on the front surface of the display panel 120 in order to implement back-bonding of the flexible layer 130. The first back cover 110a supports only an area corresponding to the display area AA, and the second back cover 110b supports an area starting from the wiring area at the lower end of the display area AA.

[0228] This means that, according to the present disclosure, in the large-format rollable display device 1000, the position of the cover unit 1050 and the cover unit 1060 is changed, and at the same time the fastening position of the majority of flexible layers 130 and the circuit board 140 is changed such that the majority of flexible layers 130 are fixed.

[0229] According to the present disclosure, the cover unit 1050 and the cover unit 1060 are arranged on the back surface of the first back cover 110a. The first back cover 110a supports only an area corresponding to the display area AA of the display panel 120, and the second back cover 110b supports an area starting from the wiring area at the lower end of the display area AA. Therefore, back bonding of the flexible layer 130 can be implemented, and the springback effect caused when the end of the display panel is rolled up can be reduced. This means that the cover unit 1050 and the cover unit 1060 are fixed to the back surface of the first back cover 110a, and the flexible layer 130, after being back-bonded, can be fixed within the cover unit 1050 and the cover unit 1060.As a result, the display panel 120 can be maintained in such a way that it is flat, even during repeated winding and unwinding, and the majority of flexible layers 130 retain the same shape, so that the breakage of the pad area due to the tensile stress of the flexible layer 130 can be improved.

[0230] Furthermore, according to the present disclosure, outer circumferential surfaces of the first cover unit 1060 and the second cover unit 1050 form an arc, and bottom surfaces form a flat area which is said to correspond to the second flat section 171Fb and the first flat section 171Fa of the roll 171.

[0231] Furthermore, the first cover unit 1060 and the second cover unit 1050 of the present disclosure are arranged in the second deformable area MA2 of the first back cover 110a such that they accommodate a portion of the plurality of flexible layers 130 and the printed circuit board 140. The first cover unit 1060 and the second cover unit 1050 of the present disclosure accommodate and protect the plurality of flexible layers 130 and the printed circuit board 140.

[0232] The first cover unit 1060 of the present disclosure can be partially attached to the rear surface of the second support area PA2 of the first rear cover 110a in such a way as to be fixed, but is not limited to this. For this purpose, the third fastening hole can be formed in the second support area PA2 of the first rear cover 110a. The first cover unit 1060 can be attached to the first rear cover 110a by means of the third fastening hole.

[0233] The second cover unit 1050 of the present disclosure can have a second base plate 1051 and a second cover plate 1053.

[0234] The second base plate 1051 is provided by means of a planar flat surface which is to be arranged on the rear surface of the plurality of flexible layers 130, i.e., on a bottom surface of the second cover plate 1053. The second base plate 1051 can be fixed to the rear surface of the first rear cover 110a on the second cover plate 1053 of the second cover unit 1050. Accordingly, the second base plate 1051 of the second cover unit 1050, together with the second cover plate 1053, can support the plurality of flexible layers 130. For example, the second base plate 1051 is formed from a material that has a stiffness sufficient to support the plurality of flexible layers 130 in such a way that they are flat, but is not limited to this.

[0235] The second cover plate 1053 is arranged on the rear surface of the first rear cover 110a.

[0236] The second cover plate 1053 is arranged such that it covers the majority of flexible layers 130 located in the second support area PA2 of the first back cover 110a, and may have a convex shape. This means that one surface of the second cover plate 1053 may be curved. The second cover plate 1053 is made of a material that provides stiffness to protect the flexible layers 130, but is not limited to this purpose. The bottom surface of the second cover plate 1053 may be flat.

[0237] The first cover unit 1060 of the present disclosure can comprise a first base plate 1061 and a first cover plate 1063.

[0238] The first base plate 1061 is provided by means of a planar flat surface which is to be arranged on the back surface of the printed circuit board 140, i.e., on a bottom surface of the first cover plate 1063. The first base plate 1061 can be fixed to the first cover plate 1063 of the first cover unit 1060 on the back surface of the first back cover 110a. Accordingly, the first base plate 1061 of the first cover unit 1060, together with the first cover plate 1063, can support the printed circuit board 140. For example, the first base plate 1061 is formed from a material that has a stiffness to support the printed circuit board 140 in such a way that it is flat, but is not limited to this.

[0239] The first cover plate 1063 is arranged on the rear surface of the first rear cover 110a.

[0240] The first cover plate 1063 is arranged to cover the printed circuit board 140, which is located in the second deformable area MA2 of the first back cover 110a, and has a convex shape. This means that one surface of the first cover plate 1063 can be curved. The first cover plate 1063 is made of a material that has the necessary rigidity to protect the printed circuit board 140, but this is not its only function. The bottom surface of the first cover plate 1063 can be flat.

[0241] The second cover plate 1053 and the first cover plate 1063 can be coupled together. For example, a plurality of fastening holes H, passing through the second cover plate 1053 and the first cover plate 1063, are formed therein, and a fastening component, such as a screw, is attached to it through the plurality of fastening holes H, so that the second cover plate 1053 and the first cover plate 1063 are coupled together.

[0242] However, the second cover plate 1053 and the first cover plate 1063 can be coupled to each other in various ways and are not limited to this.

[0243] The cover unit 1050 and the cover unit 1060 according to another exemplary embodiment of the present disclosure are arranged to be subdivided into the first cover unit 1060 and the second cover unit 1050, so that when the display unit DP is wound around the roll 171, the cover units can retain their original state without being bent. Therefore, the majority of flexible layers 130 and the printed circuit board 140 can be better protected.

[0244] The roller according to the present disclosure can be configured to have only a flat section, and in this case the bottom surface of the cover unit can be configured by means of a flat surface, which is described in more detail with reference to another exemplary embodiment of the present disclosure. <Exemplary embodiment in which a roller has only a flat section>

[0245] Fig. Figure 16 is a cross-sectional view of a display device according to another comparative example.

[0246] Fig. Figures 17A to 17D are cross-sectional views of a fastening process of a display device according to yet another comparative example.

[0247] The only difference between the 2000 display device of the Fig. 16 and the Fig. 17A to 17D and the display device 100 described above according to the exemplary embodiment of the present disclosure of Fig. 4, Fig. 5, Fig. 6 to Fig. 7 is a roller and a cover unit, however other structures are essentially the same.

[0248] Fig. Figure 17A depicts a state of a first rear cover 110a, a second rear cover 110b, a display panel 120, and a cover assembly 2050 before they are attached to one another. Furthermore, it depicts Fig. Figure 17B represents a state in which the first rear cover 110a, the second rear cover 110b, and the display panel 120 are attached to one another. Furthermore, it represents Fig. 17C represents a state in which the first rear cover 110a, the second rear cover 110b, the display panel 120, and the cover unit 2050 have been attached to one another. Furthermore, it represents Fig. 17D represents a state in which the roller 2071 is attached to the second rear cover 110b.

[0249] Referring to Fig. 16 and Fig. According to another comparative example, the display unit DP, as shown in 17A to 17D, has a back cover 110, a display panel 120, a plurality of flexible layers 130, a circuit board 140 and a cover unit 2050.

[0250] Just as described above, the rear cover 110 is arranged on a rear surface (and on an entire surface of part of a lower end) of the display panel 120 such that the display panel 120, the majority of flexible layers 130 and the printed circuit board 140 are supported.

[0251] A rear cover size of 110 can be larger than a display panel size of 120. The rear cover 110 can protect other structures of the display unit DP from the outside.

[0252] Although the rear cover 110 is formed from a material that has a rigidity, at least part of the rear cover 110 may have a flexibility to be wound up or unwound together with the display panel 120.

[0253] The rear cover 110 has a plurality of support areas PA and a plurality of deformable areas MA. The plurality of support areas PA are areas in which a plurality of openings 111 are not arranged, and the plurality of deformable areas MA are areas in which a plurality of openings 111 are arranged.

[0254] The rear cover 110 can have a first rear cover 110a and a second rear cover 110b. This means that the rear cover 110 is configured to be subdivided into the first rear cover 110a and the second rear cover 110b. For example, the rear cover 110 can be configured to be subdivided into the first rear cover 110a, which is located on a rear surface of the display panel 120 with respect to a lower end of the display panel 120, and the second rear cover 110b, which is located on a front surface of the display panel 120.

[0255] In this case, the first rear cover 110a can be attached to the head bar 182, and the second rear cover 110b can be attached to the roller 2071.

[0256] The first back cover 110a has a first support area PA1, a first deformable area MA1, a second support area PA2 and a second deformable area MA2, but is not limited to this.

[0257] The second back cover 110b has a third support area PA3, a third deformable area MA3 and a fourth support area PA4, but is not limited to this.

[0258] Since the back cover 110 is wound or unwound in a slit direction, the majority of support areas PA and the majority of deformable areas MA can be arranged along the slit direction.

[0259] In the display device 2000, the back cover 110 is configured by means of the first back cover 110a and the second back cover 110b, which are arranged separately from each other such that they form the back cover 110A in such a way that it corresponds to different sizes of the display panel 120. Furthermore, the back cover 110 can be manufactured in such a way that it has a smaller size, so that the productivity of the back cover 110 can be improved.

[0260] Referring to Fig. 16 and Fig. In sections 17A to 17D, the display panel 120 can be arranged on a surface of the first rear cover 110a. For example, the display panel 120 can be arranged in the first deformable area MA1 on a surface of the first rear cover 110a.

[0261] The second adhesive layer AD2 is positioned between the display panel 120 and the first back cover 110a. The second adhesive layer AD2 bonds the display panel 120 and the first back cover 110a together. The second adhesive layer AD2 is made of a material with adhesive properties and can be a heat-curing or naturally curing adhesive.

[0262] The second adhesive layer AD2 cannot be applied to the pad area where the majority of flexible layers 130 are attached. The third support area PA3 of the second back cover 110b can be attached to a lower side of the display panel 120 by means of the third adhesive layer AD3.

[0263] The second adhesion layer AD2 and the third adhesion layer AD3 may have a double-sided adhesive tape.

[0264] A plurality of flexible layers 130 are arranged in the second support area PA2 of the first back cover 110a.

[0265] Furthermore, the circuit board 140 is arranged in the second deformable area MA2 of the first back cover 110a in such a way that it is coupled to the majority of flexible layers 130.

[0266] Referring to Fig. 16 and Fig. According to the comparison example, the display unit DP can have the cover unit 2050 in units 17A to 17D.

[0267] The cover part 2050 is located on the rear surface of the first rear cover 110a rather than on a front surface of the display panel 120 in order to implement a rear bonding of the flexible layer 130.

[0268] This means that, according to the present disclosure, in the large-format rollable display device 2000, the position of the cover unit 2050 is changed and at the same time the fastening position of the majority of flexible layers 130 and the circuit board 140 is changed such that the majority of flexible layers 130 are fixed.

[0269] Accordingly, as disclosed herein, the cover unit 2050 is arranged on the back surface of the first back cover 110a. The first back cover 110a supports only an area corresponding to the display area AA of the display panel 120, and the second back cover 110b supports an area extending from the wiring area at the lower end of the display area AA. Therefore, back bonding of the flexible layer 130 can be implemented, and the springback effect caused when the end of the display panel 120 is rolled up can be reduced. This means that the cover unit 2050 is fixed to the back surface of the first back cover 110a, and the flexible layer 130 can be fixed within the cover unit 2050 after back bonding.As a result, the display panel 120 can be kept flat even during repeated winding and unwinding, and the majority of flexible layers 130 retain the same shape, so that the breakage of the pad area due to the tensile stress of the flexible layer 130 can be improved.

[0270] Furthermore, according to the present disclosure, an outer circumferential surface of the cover unit 2050 forms an arc, and the bottom surface forms a planar flat surface such that it corresponds to the flat section 2071F of the roll 2071. This means that the bottom surface of the cover unit 2050 can be provided by means of a flat surface corresponding to the flat section 2071F of the roll 2041.

[0271] The cover unit 2050 of the present disclosure is arranged in the second support area PA2 and the second deformable area MA2 of the first back cover 110a such that it accommodates a portion of the plurality of flexible layers 130 and the printed circuit board 140. The cover unit 2050 of the present disclosure accommodates the printed circuit board 140 in order to protect it.

[0272] Part of the cover unit 2050 of the present disclosure can be attached to the rear surface of the second support area PA2 of the first rear cover 110a in such a way that it is fixed, but is not limited to this. For this purpose, the third fastening hole can be formed in the second support area PA2 of the first rear cover 110a. The cover unit 2050 can be attached to the first rear cover 110a by means of the third fastening hole.

[0273] The cover unit 2050 can have a base plate 2051 and a cover plate 2053.

[0274] The base plate 2051 is provided by means of a planar flat surface which is to be arranged on the back surface of the printed circuit board 140, that is, on a bottom surface of the cover plate 2053. The base plate 2051 can be fixed to the cover plate 2053 of the cover unit 2050 on the back surface of the first back cover 110a. Therefore, the base plate 2051 of the cover unit 2050, together with the cover plate 2053, can support the printed circuit board 140. For example, the base plate 2051 is formed from a material that has a stiffness sufficient to support the printed circuit board 140 in such a way that it remains flat, but is not limited to this.

[0275] The cover plate 2053 is arranged on the rear surface of the first rear cover 110a.

[0276] The cover plate 2053 is arranged to cover the printed circuit board 140, which is located in the second deformable area MA2 of the first back cover 110a, and has a convex shape. This means that one surface of the cover plate 2053 can be curved. The cover plate 2053 is made of a material that has the necessary rigidity to protect the printed circuit board 140, but is not limited to this purpose. The bottom surface of the cover plate 2053 can be flat.

[0277] Furthermore, the cover unit 2050 retains its original state without bending when the display unit DP is wound up to protect the majority of flexible layers 130 and the printed circuit board 140. In particular, when the display unit DP is wound up, the base plate 2051 of the cover unit 2050, which has the stiffness, maintains a flat state without bending to protect the printed circuit board 140. Additionally, a portion of the reel 2071 around which the base plate 2051 is wound can be formed as a flat surface, so that the base plate 2051 is not bent. For example, the reel 2071 can be configured using the flat section 2071F and the curved section 2071R, and the base plate 2051 rests on the flat section 2071F of the reel 2071. Therefore, although the display unit DP is wound up, the base plate 2051 can be maintained in such a way that it is flat without being bent.

[0278] Next, when the display unit DP is wound up, the cover plate 2053 of the cover unit 2050, which has the stiffness, retains an original convex shape without deformation to protect the majority of flexible layers 130 and the printed circuit board 140. Furthermore, the cover plate 2053, which has a convex shape, can form a circular shape together with the curved section 2071R of the roll 2071. For example, the bottom surface of the base plate 2051, which has a convex shape, orients a flat surface and sits on the corresponding flat section 2071F of the roll 2071 to form a substantially circular shape with the curved section 2071R of the roll 2071.Accordingly, the cover unit 2050 and the roll 2071 essentially form a circular shape, and a portion of the display panel 120 wound onto the cover unit 2050 is wound with a larger radius of curvature, so that a load acting on the display panel 120 may be reduced.

[0279] The exemplary embodiments of the present disclosure can be described as follows:

[0280] According to one aspect of the present disclosure, a display device is provided. The display device comprises a display panel, a first back cover supporting the display panel on a back surface of the display panel, at least one flexible layer electrically connected to a lower end of the back surface of the display panel and arranged on a back surface of the first back cover, a printed circuit board electrically connected to the at least one flexible layer and arranged on the back surface of the first back cover, a cover assembly accommodating the at least one flexible layer and the printed circuit board on the back surface of the first back cover, and a roller around which the display panel and the first back cover are wound or unwound.The roller has a cylindrical shape, in which part of an outer circumferential surface is formed by a first flat section and a second flat section, and the remaining part of the outer circumferential surface is formed by a curved section. The radius of curvature at a boundary between the first and second flat sections is smaller than the radius of curvature of the curved section. The cover assembly comprises a cover plate, in which one surface has a convex shape and the other surface forms a first bottom surface and a second bottom surface such that these correspond to the first and second flat sections of the roller, and a base plate, which has a first flat surface and a second flat surface and is positioned such that these correspond to the first and second bottom surfaces of the cover plate.In this process, the first floor surface and the second floor surface create a surface that is curved in two planes such that they correspond to the first flat section and the second flat section of the roll.

[0281] The display device may further include a second rear cover that supports a lower end of the display panel on a front surface of the display panel.

[0282] The display unit may further include a first adhesive layer inserted between the display panel and the first back cover to bond the display panel and the first back cover.

[0283] The first adhesion layer cannot be located on a lower end of the rear surface of the display panel where the at least one flexible layer is attached.

[0284] The display device may further include a second adhesive layer inserted between the display panel and the second back cover for bonding the display panel and the second back cover.

[0285] The first back cover can be attached to a display area of ​​the display panel in such a way that the display panel is supported, and the second back cover can be attached to a wiring area at a lower end of the display area in such a way that the display panel is supported.

[0286] The at least one flexible layer and the printed circuit board can be arranged between the base plate and the cover plate.

[0287] The at least one flexible layer can be arranged such that it overlaps with the second bottom surface of the cover plate, and the circuit board can be arranged such that it overlaps with the first bottom surface of the cover plate.

[0288] The cover unit can have a first cover unit and a second cover unit.

[0289] The first cover unit can comprise a first cover plate in which a surface has a convex shape and a first bottom surface arranges a surface such that it corresponds to the first flat section of the roll, and a first base plate which is arranged such that it corresponds to the first bottom surface of the first cover plate.

[0290] The second cover unit can include a second cover plate in which one surface has a convex shape and a second bottom surface provides a surface such that it corresponds to the second flat section of the roll, and a second base plate arranged such that it corresponds to the second bottom surface of the second cover plate.

[0291] The printed circuit board can be arranged between the first base plate and the first cover plate, and the at least one flexible layer can be arranged between the second base plate and the second cover plate.

[0292] A mounting hole may be formed that passes through the first cover plate and the second cover plate, and a mounting component may be attached through the mounting hole in such a way that the first cover plate and the second cover plate interact.

Claims

[1] A display device (100, 1000, 2000), comprising: a display panel (120); a first rear cover (110a) that supports the display panel (120) on a rear surface of the display panel (120); at least one flexible layer (130) electrically connected to a lower end of the rear surface of the display panel (120) and arranged on a rear surface of the first rear cover (110a); a printed circuit board (140) which is electrically connected to the at least one flexible layer (130) and is arranged on the back surface of the first back cover (110a); a cover unit (150, 1050, 1060, 2050) that accommodates the at least one flexible layer (130) and the printed circuit board (140) on the rear surface of the first rear cover (110a); and a roller (171) around which the display panel (120) and the first back cover (110a) are wound or unwound, wherein the roller (171) has a cylindrical shape in which part of an outer circumferential surface is provided by means of a first flat section (171Fa) and a second flat section (171Fb) and the remaining part of the outer circumferential surface is provided by means of a curved section (171R), where a radius of curvature at a boundary of the first flat section (171Fa) and the second flat section (171Fb) is smaller than the radius of curvature of the curved section (171R), the cover unit (150) comprises: a cover plate (153) in which one surface has a convex shape and the other surface provides a first bottom surface (152a) and a second bottom surface (152b) such that, in a wound-up state of the display device, they correspond to the first flat section (171Fa) and the second flat section (171Fb) of the roll (171); and a base plate (151) having a first flat surface and a second flat surface and being arranged such that they correspond to the first bottom surface (152a) and the second bottom surface (152b) of the cover plate (153), wherein the first ground surface (152a) and the second ground surface (152b) form a surface which is curved in two planes such that they correspond to the first flat section (171Fa) and the second flat section (171Fb) of the roll (171). [2] The display device (100, 1000, 2000) according to claim 1, further comprising: a second rear cover (110b) that supports a lower end of the display panel (120) on a front surface of the display panel (120). [3] The display device (100, 1000, 2000) according to claim 1 or 2, further comprising: a first adhesion layer (AD2) which is inserted between the display panel (120) and the first rear cover (110a) to connect the display panel (120) and the first rear cover (110a). [4] The display device (100, 1000, 2000) according to claim 3, wherein the first adhesion layer (AD2) is not arranged on a lower end of the rear surface of the display panel (120) to which the at least one flexible layer (130) is attached. [5] The display device (100, 1000, 2000) according to claim 2, further comprising: a second adhesive layer (AD3) which is inserted between the display panel (120) and the second rear cover (110b) to connect the display panel (120) and the second rear cover (110b). [6] The display device (100, 1000, 2000) according to claim 2, wherein the first rear cover (110a) is attached to a display area of ​​the display panel (120) in such a way that it supports the display panel (120), and the second rear cover (110b) is attached to a wiring area at a lower end of the display area in such a way that it supports the display panel (120). [7] The display device (100) according to any one of claims 1 to 6, wherein the at least one flexible layer (130) and the circuit board (140) are arranged between the base plate (151) and the cover plate (153). [8] The display device (100) according to any one of claims 1 to 7, wherein the at least one flexible layer (130) is arranged such that it overlaps with the second bottom surface (152b) of the cover plate (153), and the circuit board (140) is arranged such that it overlaps with the first bottom surface (152a) of the cover plate (153). [9] The display device (100) according to any one of claims 1 to 8, wherein the cover unit (1050, 1060) comprises a first cover unit (1060) and a second cover unit (1050). [10] The display device (100) according to claim 9, wherein the first cover unit (1060) comprises: a first cover plate (1063) in which a surface has a convex shape and a first bottom surface arranges a surface such that it corresponds to the first flat section (171Fa) of the roll (171); and a first base plate (1061) which is arranged such that it corresponds to the first bottom surface of the first cover plate (1060). [11] The display device (1000) according to claim 10, wherein the second cover unit (1050) comprises: a second cover plate (1053) in which one surface has a convex shape and a second bottom surface provides a surface such that it corresponds to the second flat section (171Fb) of the roll (171); and a second base plate (1051) arranged such that it corresponds to the second bottom surface of the second cover plate (1053). [12] The display device (1000) according to claim 11, wherein the circuit board (140) is arranged between the first base plate (1061) and the first cover plate (1063) and the at least one flexible layer (130) is arranged between the second base plate (1051) and the second cover plate (1053). [13] The display device (1000) according to claim 11 or 12, wherein a mounting hole (H) is formed which passes through the first cover plate (1063) and the second cover plate (1053) and a mounting component is fastened through the mounting hole (H) such that the first cover plate (1063) and the second cover plate (1053) interact.

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