Flexible display devices

Abstract

A flexible display device according to an exemplary embodiment includes: a display panel having a display area and a driving area, wherein a signal control chip controlling the display panel is mounted on the driving area; a first base film portion disposed under the display area and including a metal layer; and a second base film portion disposed under the driving area and formed to be transparent.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2018-0001612 filed in the Korean Intellectual Property Office on January 5, 2018, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a flexible display device, and in particular, to a flexible display device including a base film used in manufacturing the flexible display device. Background Art

[0004] A display device such as an organic light emitting diode display includes a display panel, and the display panel is manufactured by forming several layers and elements on a substrate. Generally, glass has been used as a substrate for a display panel. However, because the glass substrate is rigid, it is difficult to bend or deform the display device. Recently, a flexible display device using a flexible substrate such as plastic that is lightweight and can be easily deformed has been developed.

[0005] Flexible display devices can be divided into bendable display devices, foldable display devices, and rollable display devices according to their uses or shapes. These flexible display devices can be bent or folded when using a flexible substrate such as plastic. However, the flexible substrate has elasticity and has a characteristic that it tends to flatten again even when the flexible substrate is bent. In other words, there is a disadvantage that a certain degree of warping cannot be maintained.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the inventive concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0007] Exemplary embodiments provide a flexible display device having a base film including a metal, and provide a flexible display device having a transparent base film below a portion where a driving chip is mounted, even if the flexible display device has a base film including a metal.

[0008] According to an exemplary embodiment, a flexible display device includes: a display panel having a display area and a driving area; a first base film portion disposed under the display area and including a metal layer; and a second base film portion disposed under the driving area and formed to be transparent. A signal control chip for controlling the display panel is mounted on the driving area.

[0009] The first base film portion and the second base film portion include at least one layer formed of the same material.

[0010] The first base film portion may include: a base film including a metal layer; and an adhesive layer attached to the bottom of the display area.

[0011] The second base film portion may include an outer adhesive layer formed of the same material as the adhesive layer of the first base film portion.

[0012] The first base film portion may further include a film layer disposed between the adhesive layer and the base film.

[0013] The second base film portion may include: an external adhesive layer formed of the same material as the adhesive layer of the first base film portion; and an external film layer formed of the same material as the film layer of the first base film portion.

[0014] The second base film portion may include a transparent layer disposed in a layer corresponding to the metal layer of the first base film portion.

[0015] The first base film portion and the second base film portion may further include coatings, respectively. The first base film portion may include coatings disposed above and below the metal layer, and the second base film portion may include coatings disposed above and below the transparent layer.

[0016] The first base film portion and the second base film portion may further include coating layers, respectively, the first base film portion may include the coating layers disposed above and below based on the metal layer, and the second base film portion may include only the coating layers.

[0017] The first base film portion may further include a coating, the second base film portion may include a transparent layer and the coating, the first base film portion may include a coating disposed above and below based on a metal layer, and the transparent layer may be disposed on the coating in the second base film portion.

[0018] The transparent layer of the second base film portion may be disposed in a layer corresponding to the metal layer of the first base film portion.

[0019] The first base film portion and the second base film portion may further include: a coating, which may be arranged above and below the first base film portion based on the metal layer, and the coating may have a curved structure in the second base film portion; and an adhesive layer for fixing the curved structure of the coating.

[0020] The metal layer may be formed of a metal such as aluminum or of a metal sheet.

[0021] The device may further include an alignment key disposed in a driving area of ​​the display panel and adjacent to the signal control chip.

[0022] A flexible printed circuit board attached on one side of the driving area of ​​the display panel, and a main printed circuit board (PCB) attached on one side of the flexible printed circuit board may be further included.

[0023] A touch panel disposed on the display panel and sensing a touch may be further included.

[0024] A window disposed on the touch panel may be further included.

[0025] A buffer layer may be further included under the metal layer as a first base film portion.

[0026] The display panel may further include an anti-crack layer disposed on the bending area. The bending area may be disposed in the driving area and between the signal control chip and the display area.

[0027] The flexible display device may further include a pressure sensor layer disposed under the metal layer in the first base film portion.

[0028] According to an exemplary embodiment, since the flexible display device has a base film including a metal layer, it is fixed in a corresponding position during bending and does not unfold. On the other hand, in the flexible display device, since the base film formed of a transparent layer can be attached under a portion where a driver chip is mounted, an alignment key is recognized when the driver chip is mounted, thereby correctly mounting the driver chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of a flexible display device according to an exemplary embodiment.

[0030] Figure 2 It shows that Figure 1 A view of the structure of a flexible display device being folded.

[0031] Figure 3 It is shown Figure 1 FIG. 1 is a view of a manufacturing step of a display panel portion of a flexible display device.

[0032] Figure 4 It is shown Figure 1 A view of a manufacturing step of a base film portion of a flexible display device.

[0033] Figure 5 is based on Figure 1 A top view of a flexible display panel of an exemplary embodiment of the present invention.

[0034] Figure 6 It is shown Figure 5 An enlarged view of an alignment key in a flexible display device.

[0035] Figure 7 is a cross-sectional view of a base film portion module according to another exemplary embodiment.

[0036] Figure 8 is a cross-sectional view of a base film portion module according to another exemplary embodiment.

[0037] Fig. 9 is a cross-sectional view of a flexible display device according to an exemplary embodiment.

[0038] Fig.10 is a cross-sectional view of a base film according to an exemplary embodiment.

[0039] Figures 11 to 13 Shows Fig.10 An exemplary variation of the base film is shown in .

[0040] Fig.14 is a view illustrating a method of manufacturing a flexible display device according to an exemplary embodiment.

[0041] Fig.15 is a cross-sectional view of a flexible display device according to another exemplary embodiment.

[0042] Fig.16 is a cross-sectional view of a flexible display device according to another exemplary embodiment. DETAILED DESCRIPTION

[0043] The inventive concept will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the inventive concept are shown. As will be appreciated by those skilled in the art, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the inventive concept.

[0044] In order to clearly explain the present inventive concept, parts that are not directly related to the present inventive concept are omitted, and the same reference numerals are attached to the same or similar constituent elements throughout the specification.

[0045] In addition, for better understanding and ease of description, the size and thickness of each configuration shown in the drawings are arbitrarily shown, but the inventive concept is not limited thereto. In the drawings, the thickness of layers, films, panels, regions, etc. are exaggerated for clarity. In the drawings, the thickness of some layers and regions are exaggerated for better understanding and ease of description.

[0046] It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" another element, it can be directly on the other element, or there can be intervening elements. Conversely, when an element is referred to as being "directly on" another element, there are no intervening elements. In addition, in the specification, the words "on" or "above" mean being on or below a target portion, and do not necessarily mean being on the upper side of the target portion based on the direction of gravity.

[0047] In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprising” or “including” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0048] Furthermore, in this specification, the phrase “on a plane” means observing a target portion from the top, and the phrase “on a cross section” means observing a cross section formed by vertically cutting the target portion from the side.

[0049] Now, refer to Figure 1 A flexible display device according to an exemplary embodiment is described.

[0050] Figure 1 is a cross-sectional view of a flexible display device according to an exemplary embodiment.

[0051] The flexible display device according to an exemplary embodiment includes a display panel part 10 including a display panel 100 , and a base film part 20 including a base film 300 .

[0052] The display panel section 10 includes a display panel 100 and components disposed thereon, such as Figure 1 That is, the display panel part 10 includes a display panel 100 , a polarizer 250 , a touch panel 200 , a signal control chip 400 , a flexible printed circuit board (FPCB) 410 , and a main printed circuit board (PCB) 450 .

[0053] The display panel 100 may use a flexible organic light-emitting panel in which an organic light-emitting element is formed on a substrate such as plastic. The organic light-emitting panel has an advantage in that the display brightness does not change even when the display panel is bent to be suitable for use with a flexible display device. However, the display panel 100 according to the present exemplary embodiment is not limited to the organic light-emitting panel.

[0054] The display panel 100 includes a display area for displaying an image and a driving area on which a signal control chip 400 is disposed.

[0055] First, the display area of ​​the display panel 100 will be described.

[0056] The touch panel 200 is disposed on the display area of ​​the display panel 100 , and the polarizer 250 is disposed between the touch panel 200 and the display panel 100 .

[0057] The touch panel 200 is an input device capable of performing input by touching an image displayed on the display panel 100. That is, the touch panel 200 senses a position where a touch is performed so that the flexible display device can perform its operation.

[0058] On the other hand, the polarizer 250 improves the characteristics of light emitted from the display panel 100, thereby playing a role in easily recognizing an image provided from the display panel 100. In addition, interference between the display panel 100 and the touch panel 200 may be reduced.

[0059] According to an exemplary embodiment, the position of the polarizer 250 and the position of the touch panel 200 may be exchanged with each other so that the polarizer 250 may be disposed on the touch panel 200 .

[0060] Also, according to an exemplary embodiment, not only an image may be displayed but also a structure allowing touch sensing may be provided while the display panel 100 has one panel structure. In this case, the polarizer 250 may be omitted.

[0061] The touch panel 200 , the polarizer 250 , and the display panel 100 may be attached to each other by an adhesive layer (not shown).

[0062] In addition, the signal control chip 400 is mounted on the driving area of ​​the display panel 100. The signal control chip 400 is electrically connected to each pixel of the display panel 100. Each pixel is controlled by a signal provided from the signal control chip 400. Thus, light of a predetermined brightness is emitted. When the signal control chip 400 is mounted, an alignment key (see Figure 6 ) to help align the signal control chip 400 with the flexible substrate of the display panel 100. Therefore, the signal control chip 400 can be mounted on the display panel 100 without misalignment.

[0063] The flexible printed circuit board 410 is attached to the outside of the driving area of ​​the display panel 100. Wirings are formed in the flexible printed circuit board 410, and the corresponding wirings are connected to the signal control chip 400.

[0064] The main printed circuit board (PCB) 450 is attached to the outside of the flexible printed circuit board 410. Wiring may be formed in the main printed circuit board (PCB) 450, and the main printed circuit board (PCB) 450 may include a main controller mounted in the form of a chip. The main controller performs the entire control of the electronic devices included in the display device, and sends data to be displayed on the display device to the signal control chip 400. The data provided from the main controller is sent to the signal control chip 400 through wiring formed in the main printed circuit board (PCB) 450 and the flexible printed circuit board 410 and wiring formed in the driving area of ​​the display panel 100. The main printed circuit board (PCB) 450 may be formed of a flexible material such as the flexible printed circuit board 410, or may be formed of a rigid material.

[0065] A layer protecting the display panel section 10 , such as a window, may be further attached on the display panel section 10 .

[0066] Next, the base film section 20 attached under the display panel section 10 and having a sheet shape will be described.

[0067] The base film portion 20 includes constituent elements disposed under the display panel 100, and as shown in FIG. Figure 1 That is, the base film portion 20 includes a first base film portion 21 disposed under the display area of ​​the display panel 100 and a second base film portion 22 disposed under the driving area of ​​the display panel 100 .

[0068] First, the structure of the first base film portion 21 will be described.

[0069] The first base film portion 21 includes a base film 300 , a film layer 310 , an adhesive layer 320 , and a pressure sensor layer 350 .

[0070] When the display panel portion 10 is bent, because the display panel portion 10 can receive elastic restoring force, the base film 300 including the metal layer needs to be fixed at the corresponding position. The metal layer is formed of a metal such as aluminum (Al), and the metal layer may be a solid metal layer or may include a metal pattern. The base film 300 may include an adhesive layer (not shown) covering the upper or lower portion of the metal layer. The adhesive layer may include a pressure sensitive adhesive (PSA).

[0071] The film layer 310 is disposed between the base film 300 and the display panel 100, and may be a buffer between the lower surface of the display panel 100 and the base film 300. The film layer 310 may be formed of polyethylene terephthalate (PET).

[0072] According to an exemplary embodiment, the film layer 310 may be omitted. The film layer 310 plays a role in supporting the base film 300, and the film layer 310 may be omitted in a structure supported only by the base film 300. Fig.14 and Fig.15 Shown in.

[0073] The adhesive layer 320 is disposed on the film layer 310, and the display panel 100 and the film layer 310 are attached by the adhesive layer 320. The adhesive layer 320 may be formed of a strong adhesive material so that the film layer 310 and the display panel 100 are not separated from each other.

[0074] The film layer 310 and the base film 300 may also be attached by an adhesive layer.

[0075] In the present exemplary embodiment, the pressure sensor layer 350 is included under the base film 300. According to an exemplary embodiment, the pressure sensor layer 350 may be omitted, and if the display device is pressed, the pressure is sensed so that the display device may change a displayed image.

[0076] Next, the second base film portion 22 disposed under the driving area of ​​the display panel 100 will be described.

[0077] The exterior film layer 315 is disposed under the driving area of ​​the display panel 100 as the base film part 20. The exterior film layer 315 is formed of the same material as the film layer 310 disposed under the display area of ​​the display panel 100. According to an exemplary embodiment, the exterior film layer 315 may be formed of PET (polyethylene terephthalate).

[0078] The external film layer 315 is attached to the lower surface of the driving area of ​​the display panel 100 through the external adhesive layer 325. The external adhesive layer 325 is also formed of the same material as the adhesive layer 320 disposed under the display area of ​​the display panel 100. According to an exemplary embodiment, the external adhesive layer 325 may be formed of a strong adhesive material so that the external film layer 315 and the display panel 100 are not separated from each other.

[0079] When comparing the first base film portion 21 and the second base film portion 22, Figure 1 In an exemplary embodiment of the present invention, the second base film portion 22 has a structure in which the base film 300 and the underlying layers are not included and also includes a layer disposed on the base film 300. That is, the first base film portion 21 and the second base film portion 22 may have layers corresponding to each other, and some layers may not correspond to each other. Figure 1 In the exemplary embodiment of , the adhesive layer 320 and the external adhesive layer 325 and the film layer 310 and the external film layer 315 are layers corresponding to each other, and the base film 300 and the pressure sensor layer 350 are layers that do not correspond to each other. Figure 1 In an exemplary embodiment of the present invention, corresponding layers are formed of the same material.

[0080] The second base film portion 22 is formed of only a transparent layer. That is, the base film 300 including the metal layer is not included in the second base film portion 22, so that when the display panel 100 is observed under the outer film layer 315, the signal control chip 400 and the alignment key at the top of the display panel 100 can be identified. That is, even when the alignment key is identified at the bottom, the signal control chip 400 can be easily aligned when the signal control chip 400 is mounted on the display panel 400. On the other hand, if the second base film portion 22 disposed under the driving area of ​​the display panel 100 includes the metal base film 300, the alignment key may not be identified, so that misalignment of the signal control chip 400 may occur. Therefore, in the present invention, the second base film portion 22 is formed to be transparent and does not include an opaque material like a metal layer, so that there is an advantage that the alignment key can be identified at the bottom even if the second base film portion 22 is bonded.

[0081] In addition, since the second base film portion 22 is formed transparent, after the flexible printed circuit board 410 is bonded to the display panel 100 by using an anisotropic conductive film (ACF), it is also possible to check whether there is a problem with the bonding of the flexible printed circuit board 410 by checking the recess of the anisotropic conductive film.

[0082] exist Figure 1 In the above exemplary embodiments, an adhesive layer may be additionally formed between the layers to bond the layers, and in this case, the adhesive layer used may be a pressure-sensitive adhesive (PSA).

[0083] On the other hand, a bending area is provided at a portion of the driving area of ​​the display panel 100 where the signal control chip 400 is not provided. Figure 1 The flexible display device shown is folded in the bending area, thereby having a Figure 2 The structure shown.

[0084] Figure 2 Is to show folding Figure 1 A view of the structure of a flexible display device.

[0085] Figure 2 The structure in which the display panel 100 is folded in the bending area disposed between the display area and the driving area of ​​the display panel 100 is shown. The bending area is an area disposed in the driving area of ​​the display panel 100 and disposed between the signal control chip 400 and the display area in the driving area.

[0086] If the display panel 100 is folded in the bending region, the driving region of the display panel 100 is disposed below the display region of the display panel 100, so that the area occupied by the display panel 100 in a plan view can be reduced. As a result, an electronic device including a flexible display device can also have a small area. Figure 2 As shown, the folded structure is formed after the signal control chip 400 is mounted using an alignment key.

[0087] Next, in Figure 2 In the folding structure shown, the flexible display device can be folded based on one axis or more axes present in the display area. In this case, the metal layer of the base film 300 supports the folding structure so as not to unfold.

[0088] Reference Figure 2 ,and Figure 1 Unlike, a crack prevention layer 105 is additionally formed at a portion folded into the upper surface of the display panel 100 (i.e., the bending area). According to an exemplary embodiment, the crack prevention layer 105 may be omitted, and is a layer for protecting the wiring disposed on the bending area from disconnection. The crack prevention layer 105 may be formed by coating and curing a resin cured by ultraviolet rays.

[0089] The flexible display device is manufactured by a method of separately manufacturing the display panel part 10 and the base film part 20 and bonding them.

[0090] Next, refer to Figure 3 and Figure 4 Describe the manufacturing Figure 1 The steps of the flexible display device are shown.

[0091] First, through Figure 3 A method of manufacturing the display panel section 10 is described.

[0092] Figure 3 It shows the manufacturing Figure 1 A view of a step of manufacturing a display panel portion of a flexible display device.

[0093] First, describe Figure 3 (A).

[0094] The display panel portion module for manufacturing the display panel portion 10 includes the display panel 100 , a release film layer 340 for protecting the display panel 100 up and down, and a weak adhesive layer 330 for bonding the release film layer 340 and the display panel 100 .

[0095] The release film layer 340 attached to both sides of the display panel 100 may be formed of polyethylene terephthalate (PET). The release film layer 340 protects the display panel 100 from being damaged during the manufacturing process of the display panel 100 and is not actually included in the display device and the display panel portion 10.

[0096] The display panel 100 and the two release film layers 340 are bonded by the weak adhesive layer 330. The reason for using the weak adhesive layer 330 is that the release film layer 340 must be removed. Therefore, the weak adhesive layer 330 has weak adhesiveness so that it can be easily peeled off, and an adhesive having weak adhesive strength among pressure-sensitive adhesives can be used.

[0097] Figure 3 (B) shows that the release film layer 340 disposed under the display panel 100 is removed. This shows a step just before the base film part 20 is bonded under the display panel 100.

[0098] Figure 3 (B) also shows a state where the release film layer 340 disposed on the top is attached. However, the release film layer 340 located on the top will also be removed, and reference is made to Figure 1 , the touch panel 200 and the polarizer 250 are attached at a position where the release film layer 340 disposed on the top is removed. According to an exemplary embodiment, the bonding of the touch panel 200 and the polarizer 250 may be performed before the bonding of the base film part 20.

[0099] Next, through Figure 4 A method of manufacturing the base film portion 20 is described.

[0100] Figure 4 It shows the manufacturing Figure 1 A view of the steps of forming a base film portion of a flexible display device.

[0101] First, describe Figure 4 (A).

[0102] The base film portion module for manufacturing the base film portion 20 has a structure in which the first base film portion 21 and the second base film portion 22 are connected by an upper release film layer 340 and a lower release film layer 341 .

[0103] The base film portion module has a structure in which an upper release film layer 340 and a lower release film layer 341 are further bonded to the first base film portion 21 and the second base film portion 22 .

[0104] The upper release film layer 340 protects the base film portion 20 until the base film portion 20 is attached to the display panel portion 10. Although not shown, a weak adhesive layer may be further included between the upper release film layer 340 and the base film portion 20.

[0105] On the other hand, the lower release film layer 341 is attached to the first base film portion 21 and the second base film portion 22 through the weak adhesive layers 330 and 330-1. The lower release film layer 341 has a function of preventing the first base film portion 21 and the second base film portion 22 from being separated when the base film portion 20 is attached to the display panel portion 10, and is removed after the first base film portion 21 and the second base film portion 22 are attached to the display panel portion 10.

[0106] The first base film portion 21 and the second base film portion 22 have a step so that the weak adhesive layer 330-1 attached to the second base film portion 22 can be formed thicker than the weak adhesive layer 330 attached to the first base film portion 21. If the step is large, a transparent film may be additionally formed to reduce the step under the second base film portion 22.

[0107] The first base film portion 21 is disposed under the display region of the display panel 100 after bonding, and the second base film portion 22 is disposed under the driving region of the display panel 100 after bonding.

[0108] The structures of the first base film portion 21 and the second base film portion 22 are Figure 1 and its further description is omitted.

[0109] Reference Figure 4 (B) After removing the upper release film layer 340, the base film partial module is bonded to the display panel partial module.

[0110] The first base film portion 21 and the second base film portion 22 are separated from each other so that even if the upper release film layer 340 is removed, the lower release film layer 341 fixes the two base film portions 21 and 22 without separation. After the first base film portion 21 and the second base film portion 22 are attached to the display panel portion 10, the lower release film layer 341 is removed.

[0111] Since the second base film portion 22 does not include a metal layer and is formed to be transparent, the alignment key set on the top of the display panel 100 can be identified when viewed from the bottom, so that alignment of the signal control chip 400 is possible, and the recess of the anisotropic conductive film (ACF) used when attaching the flexible printed circuit board 410 to the display panel 100 can be checked at the bottom of the display panel 100.

[0112] Next, based on the display panel 100 Figure 5 Describe the display area and the drive area separately.

[0113] Figure 5 is based on Figure 1 A top view of a flexible display panel of an exemplary embodiment of the present invention.

[0114] The display panel 100 includes a display area 110 and a driving area 120 .

[0115] The display area 110 includes pixels that display images, and an organic light emitting diode element is formed in each pixel so as to emit light according to current flowing through the organic light emitting diode.

[0116] The display panel 100 is formed of a substrate such as flexible plastic, and thus any portion of the display area 110 may be folded by having a flexible property. However, according to an exemplary embodiment, the display area 110 may be manufactured to have a folding structure based on a specific position.

[0117] On the other hand, the driving area 120 is disposed outside the display area.

[0118] The driving area 120 includes a signal control chip 400 for applying a control signal to the pixels of the display area 110 and wiring (not shown) for applying a signal to each pixel.

[0119] Furthermore, in the driving area 120, the bending area is disposed between the signal control chip 400 and the display area 110. No separate layer is attached above and below the bending area, and the bending area may be as Figure 2 Fold as shown.

[0120] Also, in the driving area 120, an alignment key 405 is formed at a portion where the signal control chip 400 is mounted, and this Figure 6 Shown in.

[0121] Figure 6 It is shown Figure 5 An enlarged view of the alignment key of the flexible display device.

[0122] like Figure 6 As shown, an alignment key 405 having a cross shape is formed near the position where the signal control chip 400 is installed in the driving area 120 of the display panel 100. Figure 6 As shown, the alignment key 405 may be disposed in the area where the signal control chip 400 is disposed, or may be disposed near the area where the signal control chip 400 is disposed.

[0123] If the signal control chip 400 overlaps the display panel 100 to be installed, the alignment key 405 is covered. Therefore, the signal control chip 400 can be installed while viewing the alignment key 405 under the display panel 100. When considering this, although the base film 300 including metal is used in the flexible display device, the second base film portion 22 disposed under the driving area 120 of the display panel 100 has a transparent structure.

[0124] Next, a structure of a base film portion module according to another exemplary embodiment is described.

[0125] Figure 7 is a cross-sectional view of a base film portion module according to another exemplary embodiment.

[0126] according to Figure 7 The base film portion 20 of the exemplary embodiment further includes a buffer layer 170, Figure 4 The exemplary embodiment of is different and does not include a pressure sensor layer.

[0127] according to Figure 7 The base film portion module of the exemplary embodiment has a structure in which an upper release film layer 340 and a lower release film layer 341 are attached to the first base film portion 21 and the second base film portion 22 .

[0128] The base film portion module for manufacturing the base film portion 20 has a structure in which the first base film portion 21 and the second base film portion 22 are connected by an upper release film layer 340 and a lower release film layer 341 .

[0129] The upper and lower release film layers 340 and 341 protect the base film portion 20 before attaching the base film portion 20 to the display panel portion 10. In addition, the lower release film layer 341 performs a function of preventing the first and second base film portions 21 and 22 from being separated in a state where the upper release film layer 340 is removed.

[0130] The first base film portion 21 is disposed under the display area of ​​the display panel 100 after being attached, and the second base film portion 22 is disposed under the driving area of ​​the display panel 100 after being attached.

[0131] The first base film portion 21 includes a base film 300 , an adhesive layer 320 , and a buffer layer 170 .

[0132] The base film 300 includes a metal layer, and the metal layer may be formed of a metal such as aluminum (Al). The metal layer is made of a solid metal layer or a layer including a metal pattern.

[0133] The buffer layer 170 is disposed under the base film 300. The buffer layer 170 may be formed of a transparent insulating material having elasticity, and has a function of alleviating an impact provided under the display device. Figure 7 In the exemplary embodiment of FIG. 1 , the buffer layer 170 is also formed of a transparent material.

[0134] The adhesive layer 320 is disposed between the base film 300 and the buffer layer 170 and on the base film 300. The adhesive layer 320 may be formed of a strong adhesive material so that the base film 300 and the display panel 100 are not separated from each other. The adhesive material may use a pressure sensitive adhesive (PSA).

[0135] On the other hand, the weak adhesive layer 330 is disposed between the buffer layer 170 and the lower release film layer 341 so that the lower release film layer 341 can be easily removed.

[0136] On the other hand, the second base film portion 22 includes an external base film 305, an external buffer layer 175, and an external adhesive layer 325 disposed therebetween or on the outside.

[0137] Unlike the base film 300, the external base film 305 does not include a metal layer. That is, the external base film 305 has a transparent property and is formed of a transparent insulating material. The structure of the external base film 305 will be described later. Figures 10 to 13 Described in.

[0138] The outer buffer layer 175 is made of the same material as the buffer layer 170 disposed under the display area of ​​the display panel 100 , that is, made of a transparent insulating material having elasticity.

[0139] The external adhesive layer 325 is also formed of the same material as the adhesive layer 320 disposed under the display area of ​​the display panel 100. According to an exemplary embodiment, the external adhesive layer 325 may be formed of a strong adhesive material so as not to be separated after the external buffer layer 175 and the external base film 305 are attached to the display panel 100. The adhesive material may use a pressure sensitive adhesive (PSA).

[0140] On the other hand, the weak adhesive layer 330 - 1 is disposed between the outer buffer layer 175 and the lower release film layer 341 , so that the lower release film layer 341 is easily removed.

[0141] The first base film portion 21 and the second base film portion 22 having the above-described structure are connected by the upper release film layer 340 and the lower release film layer 341 to form a base film portion module.

[0142] In such Figure 4 After removing the upper release film layer 340, Figure 7 The base film portion module shown in FIG. 3 is also attached below the display panel portion. In this case, the lower release film layer 341 has the function of preventing the first base film portion 21 and the second base film portion 22 from being separated. After the first base film portion 21 and the second base film portion 22 are attached below the display panel portion, the lower release film layer 341 is removed.

[0143] The second base film portion 22 includes an outer base film 305 formed to be transparent and an outer buffer layer 175 formed of a transparent material, thereby being completely transparent. As a result, when viewed from the bottom, an alignment key provided on the top of the display panel 100 can be identified, so that alignment of the signal control chip 400 is possible, and a notch of an anisotropic conductive film (ACF) used when attaching the flexible printed circuit board 410 to the display panel 100 can be checked at the bottom of the display panel 100.

[0144] Next, refer to Figure 8 A structure of a base film portion module according to another exemplary embodiment is described.

[0145] Figure 8 is a cross-sectional view of a base film portion module according to another exemplary embodiment.

[0146] like Figure 8 As shown, Figure 7 Unlike the base film portion module, the buffer layer 170 has a structure extending to the bottom of the second base film portion 22.

[0147] according to Figure 8 The base film portion module of the exemplary embodiment has a structure in which an upper release film layer 340 and a lower release film layer 341 are further attached above and below the first base film portion 21 and the second base film portion 22. The upper release film layer 340 and the lower release film layer 341 protect the top and bottom of the base film portion 20 until the base film portion 20 is attached to the display panel portion 10. In addition, the lower release film layer 341 performs a function of preventing the first base film portion 21 and the second base film portion 22 from being separated from each other when the upper release film layer 340 is removed.

[0148] exist Figure 8 In an exemplary embodiment of the present invention, the buffer layer 170 may also be formed of a transparent insulating material having elasticity, and has a function of alleviating impact provided under the display device.

[0149] Figure 8Exemplary embodiments of the invention are described below.

[0150] The base film portion module for manufacturing the base film portion 20 has a structure in which the first base film portion 21 and the second base film portion 22 are connected by upper and lower release film layers 340 and 341 and a buffer layer 170 disposed on the top and bottom.

[0151] The first base film portion 21 is disposed under the display area of ​​the display panel 100 after bonding, and the second base film portion 22 is disposed under the driving area of ​​the display panel 100 after bonding.

[0152] The first base film portion 21 includes a base film 300 , an adhesive layer 320 , and a buffer layer 170 .

[0153] The base film 300 includes a metal layer, and the metal layer may be formed of a metal such as aluminum (Al). The metal layer is made of a solid metal layer or a layer including a metal pattern.

[0154] The buffer layer 170 is disposed under the base film 300. The buffer layer 170 may be formed of a transparent insulating material having elasticity, and has a function of alleviating an impact provided under the display device. Also, the buffer layer 170 extends to the bottom of the second base film 22.

[0155] The adhesive layer 320 is disposed between the base film 300 and the buffer layer 170 and on the base film 300. The adhesive layer 320 may be formed of a strong adhesive material so that the base film 300 and the display panel 100 are not separated from each other. The adhesive material may use a pressure sensitive adhesive (PSA).

[0156] The lower release film layer 341 is attached under the buffer layer 170. The lower release film layer 341 also extends to the bottom of the second base film 22 like the buffer layer 170. The weak adhesive layer 330 attaching the lower release film layer 341 and the buffer layer 170 also extends to the bottom of the second base film 22.

[0157] The weak adhesive layer 330 disposed between the buffer layer 170 and the lower release film layer 341 facilitates removal of the lower release film layer 341 .

[0158] On the other hand, the second base film portion 22 includes an external base film 305 and an external adhesive layer 325 .

[0159] Unlike the base film 300, the external base film 305 does not include a metal layer. That is, the external base film 305 has a transparent property and is formed of a transparent insulating material. The structure of the external base film 305 will be described later. Figures 10 to 13 Described in.

[0160] The external adhesive layer 325 is disposed on the top and bottom of the external base film 305, and is formed of the same material as the adhesive layer 320 disposed in the first base film part 21. According to an exemplary embodiment, the external adhesive layer 325 may be formed of a strong adhesive material so as not to be separated after the external base film 305 is attached to the display panel 100. The adhesive material may use a pressure sensitive adhesive (PSA).

[0161] The first base film portion 21 and the second base film portion 22 having the above-described structure are connected by the upper release film layer 340 and the lower release film layer 341 to form a base film portion module.

[0162] After removing the upper release film layer 340 , the base film portion module is attached to the bottom of the display panel portion, thereby disposing the first base film portion 21 at the bottom of the display area and the second base film portion 22 at the bottom of the driving area.

[0163] exist Figure 8 In the exemplary embodiment of FIG. 1 , the buffer layer 170 and the lower release film layer 341 prevent the first base film portion 21 and the second base film portion 22 from being separated from each other.

[0164] After attaching the base film part 20 to the display panel part 10 , the lower release film layer 341 may be removed.

[0165] Since the second base film portion 22 is transparent, the alignment key set on the top of the display panel 100 can be identified when viewed from the bottom, so that the signal control chip 400 can be aligned, and the recess of the anisotropic conductive film (ACF) used when attaching the flexible printed circuit board 410 to the display panel 100 can be checked at the bottom of the display panel 100.

[0166] Next, we will refer to Fig. 9 An entire cross-sectional structure of a flexible display device according to an exemplary embodiment is described.

[0167] Fig. 9 is a cross-sectional view of a flexible display device according to an exemplary embodiment.

[0168] The flexible display device may have various layers, the structure of which is different from the structure described so far, and it may have a structure similar to Fig. 9 The cross-sectional structure.

[0169] Fig. 9 Only the layered relationship of the upper and lower portions of the display area of ​​the display panel 100 is shown.

[0170] according to Fig. 9The flexible display device of the exemplary embodiment includes a display panel 100, a base film 300, a buffer layer 170, a housing 180, a window 150, and a protective film 160. In addition, an adhesive layer 320 is provided between the layers.

[0171] The flexible display device according to an exemplary embodiment includes a display panel part including a display panel 100 , and a base film part disposed at the bottom of the display panel 100 and including a base film 300 .

[0172] The display panel portion includes the display panel 100 and constituent elements disposed thereon, and includes the display panel 100, the window 150 and the protective film 160, and an adhesive layer 320 disposed therebetween.

[0173] On the other hand, the base film portion includes constituent elements disposed on the bottom of the display panel 100, and includes a base film 300, a buffer layer 170 and a housing 180, and an adhesive layer 320 disposed therebetween. The adhesive layer 320 disposed between the base film 300 and the display panel 100 is also included in the base film portion. The base film portion is called a substrate and is attached to the bottom of the display panel portion when a flexible display device is manufactured, and has a function of fixing the display device when the display device is bent.

[0174] First, the display panel portion is described.

[0175] The display panel 100 may use a flexible organic light-emitting panel, in which an organic light-emitting element is formed on a flexible substrate such as plastic. The organic light-emitting panel has the advantage that the display brightness does not change even if the display panel is bent, and is therefore suitable for a flexible display device. However, the display panel 100 according to the present exemplary embodiment is not limited to the organic light-emitting panel. According to an exemplary embodiment, the display panel 100 may have a touch sensing function.

[0176] The window 150 is disposed on the display area of ​​the display panel 100, and the protective film 160 is disposed on the window 150. The display panel 100, the window 150, and the protective film 160 are adhered by the adhesive layer 320.

[0177] On the other hand, the signal control chip is mounted on one side of the display panel 100, and the flexible printed circuit board is bonded to the outside of the display panel 100. A main printed circuit board (PCB) may be attached to the outside of the flexible printed circuit board.

[0178] Hereinafter, a base film portion attached under a display panel portion and having a sheet shape is described.

[0179] The base film portion includes a base film 300 , a buffer layer 170 , a case 180 , and an adhesive layer 320 .

[0180] The base film 300 includes a metal layer so that the display panel portion 10 can be fixed in a corresponding position when the display panel portion 10 receives elastic restoring force. The metal layer is formed of a metal such as aluminum (Al), and may be a solid metal layer or a layer including a metal pattern.

[0181] The buffer layer 170 is disposed under the base film 300 and performs a function of protecting the display panel 100 from impact applied from the bottom. The buffer layer 170 may be formed of an insulating material having elasticity, such as a film or a sponge. When the buffer layer is disposed under the driving area of ​​the display panel 100, the buffer layer is formed of a transparent material.

[0182] The housing 180 is disposed under the buffer layer 170. The housing 180 surrounds the display panel 100 together with the window 150, and has a function of protecting the display panel 100 from the outside.

[0183] The base film 300, the buffer layer 170, and the housing 180 are attached to each other by the adhesive layer 320. In addition, the adhesive layer 320 is provided on the base film 300 to be attached to the bottom of the display panel 100.

[0184] The adhesive layer 320 may be formed of a strong adhesive material so that adjacent layers are not separated from each other. The adhesive material may use a pressure sensitive adhesive (PSA).

[0185] Hereinabove, the base film portion (first base film portion) disposed below the display area of ​​the display panel 100 is described.

[0186] The second base film portion disposed under the driving area of ​​the display panel 100 has a structure including at least one layer of the first base film portion. Other layers may be variously changed. Fig. 9 Among the layers disposed under the display panel 100, some layers may also be separated and formed under the driving area, and the remaining layers may not be formed under the driving area. However, the layers disposed under the driving area have a transparent property.

[0187] Next, we will refer to Figures 10 to 13 The structure of various base films 300 according to exemplary embodiments is described. Figure 7 The exemplary embodiments are different, according to Figures 10 to 13 The base film 300 of the exemplary embodiment is in a state before the base film 300 and the outer base film 305 are separated.

[0188] Hereinafter, a first base film region in which the base film 300 is disposed and a second base film region in which the external base film 305 is disposed are described separately.

[0189] First, describe Fig.10 .

[0190] Fig.10 is a cross-sectional view of a base film according to an exemplary embodiment.

[0191] The metal layer 301 is disposed in the first base film region, the metal layer 301 is not disposed in the second base film region, and a transparent layer 304 is disposed in the second base film region instead of the metal layer 301. The first base film region and the second base film region are connected to each other, but are separated from each other before or after being bonded to the lower surface of the display panel 100.

[0192] according to Fig.10 The base film 300 of the exemplary embodiment is composed of a total of five layers.

[0193] In the first base film region, a first coating layer 302 and a second coating layer 303 are disposed above and below the metal layer 301, respectively.

[0194] That is, the metal layer 301 is formed of a metal such as aluminum (Al), and may be a solid metal layer or a layer including a metal pattern according to an exemplary embodiment. The metal layer has a function of fixing the display device in some cases when the display device tends to return to the original state again when the display device is bent and folded.

[0195] The second coating layer 303 is disposed on the metal layer 301, and the first coating layer 302 is disposed on the second coating layer 303. On the other hand, the second coating layer 303 is disposed under the metal layer 301, and the first coating layer 302 is disposed under the second coating layer 303.

[0196] The first coating layer 302 and the second coating layer 303 are formed of a transparent material such as polyimide. In this exemplary embodiment, the first coating layer 302 is formed of PI-H ( Polyimide film), and the second coating layer 303 uses TPI (thermoplastic polyimide).

[0197] However, according to an exemplary embodiment, only one coating layer may be provided above or below the metal layer 301. When one coating layer is formed, the coating layer may be formed by using a polyimide-based material.

[0198] On the other hand, the second base film region is also composed of five layers. The second base film region is separated from the first base film region in a subsequent process, and an outer base film 305 is formed.

[0199] In the second base film region, similar to the first base film region, the first coating layer 302 and the second coating layer 303 are attached to both sides in pairs, and the transparent layer 304 is arranged in the center. The transparent layer 304 is a layer corresponding to the metal layer 301 of the first base film region. That is, the second base film region does not include the metal layer 301, but includes the transparent layer 304. The transparent layer 304 is formed of a transparent insulating material, and an optically transparent resin (OCR), an optically transparent adhesive (OCA), or a pressure-sensitive adhesive (PSA) can be used.

[0200] The second coating layer 303 is disposed on the transparent layer 304, and the first coating layer 302 is disposed on the second coating layer 303. On the other hand, the second coating layer 303 is disposed under the transparent layer 304, and the first coating layer 302 is disposed under the second coating layer 303.

[0201] The first coating layer 302 and the second coating layer 303 are formed of a transparent material such as polyimide. In this exemplary embodiment, the first coating layer 302 is formed of PI-H ( Polyimide film), and the second coating layer 303 uses TPI (thermoplastic polyimide).

[0202] However, according to an exemplary embodiment, only one coating layer may be disposed above or below the transparent layer 304, and when one coating layer is formed, the coating layer may be formed by using a polyimide-based material.

[0203] like Fig.10 As shown, the first base film region and the second base film region are connected and then separated to form the base film 300 and the external base film 305. Next, they are attached to the rear surface of the display panel 100.

[0204] Next, refer to Figures 11 to 13 A base film according to various exemplary embodiments is described.

[0205] Figures 11 to 13 is based on Fig.10 Exemplary variations of the base film.

[0206] Figures 11 to 13 A total of five exemplary embodiments are shown. Fig.10 , Figures 11 to 13 The structure before the base film 300 and the outer base film 305 are separated is shown.

[0207] exist Figures 11 to 13 In an exemplary embodiment, the structure of the base film region where the metal layer 301 is provided is Fig.10 The structure of the second basement membrane region is the same as that of the first basement membrane region, but the structure of the second basement membrane region is different. Therefore, only the second basement membrane region is described.

[0208] First, describe Fig.11 . Fig.11 Shows Fig.11 (A) and Fig.11 (B) An exemplary embodiment of the present invention.

[0209] Now describe Fig.11 (A) The second base film region of the exemplary embodiment.

[0210] Fig.11 The second base film region of (A) is composed of two layers and has a structure in which the second coating layer 303 is provided on the first coating layer 302. Fig.10 Compared with the second base film area, the first coating layer 302, the second coating layer 303 and the transparent layer 304 set on the top are omitted.

[0211] When using Fig.11 In the case of the structure formed as (A), the outer base film 305 is formed only of the first coating layer 302 and the second coating layer 303, thereby having a transparent structure.

[0212] On the other hand, according to an exemplary embodiment, the first coating layer 302 and the second coating layer 303 may be formed of one coating layer, and when formed of one coating layer, the coating layer may be formed by using a polyimide-based material. In the above exemplary embodiment, the outer base film 305 is also composed of one coating layer.

[0213] Fig.11 The second basement membrane region of (B) is composed of two layers and Fig.11 (A) has a different structure.

[0214] The first coating layer 302 and the second coating layer 303 are maintained. That is, the second coating layer 303 is disposed below the first coating layer 302 and Fig.10 Compared with the second base film area, the first coating layer 302 and the second coating layer 303 and the transparent layer 304 set at the bottom are omitted.

[0215] When using Fig.11 In the case of the structure formed as (B), the external base film 305 is composed of only the first coating layer 302 and the second coating layer 303, and thus has a transparent structure.

[0216] On the other hand, according to an exemplary embodiment, the first coating layer 302 and the second coating layer 303 may be formed of one coating layer, and when formed of one coating layer, the coating layer may be formed by using a polyimide-based material. In the above exemplary embodiment, the outer base film 305 is also composed of one coating layer.

[0217] Next, describe Fig.12 An exemplary embodiment of . Fig.12 Shows Fig.12 (A) and Fig.12 (B) Two exemplary embodiments.

[0218] exist Fig.12 In the second base film region of (A), the transparent insulating material is filled in Fig.11 In the empty area in the second base film area of ​​(A), a second transparent layer 304-1 is additionally formed. The second transparent layer 304-1 may be formed of the same material as the transparent layer 304, or may be formed of a material different therefrom. That is, OCR (optically clear resin), OCA (optically clear adhesive) or PSA (pressure sensitive adhesive) may be used, or PET (polyethylene terephthalate) may be used.

[0219] The second coating layer 303 and the first coating layer 302 are sequentially disposed under the second transparent layer 304 - 1 .

[0220] When using Fig.12 In the case of the structure formed as (A), the outer base film 305 is formed only of the second transparent layer 304-1 and the first coating layer 302 and the second coating layer 303, thereby having a transparent structure.

[0221] On the other hand, according to an exemplary embodiment, the first coating layer 302 and the second coating layer 303 may be formed of one coating layer, and when formed of one coating layer, the coating layer may be formed by using a polyimide-based material. In the above exemplary embodiment, the outer base film 305 is also composed of one coating layer.

[0222] Fig.12 The second basement membrane region of (B) has a structure in which Fig.12 The structure of the second transparent layer 304 - 1 in the second base film region of (A) extends to the top of the first base film region including the metal layer 301 .

[0223] Fig.12 (B) The second basement membrane region and Fig.12 The second base film regions of (A) are the same, so if the outer base film 305 is formed, they have the same layered structure as each other.

[0224] However, when the formation Fig.12 (B) is an exemplary embodiment in which the structure of the first base film region is different, so that the structure of the base film 300 is different from that of Fig.10 According to the structure. Fig.12 The structure of the base film 300 of the exemplary embodiment of (B) is described as follows.

[0225] In accordance with Fig.12 In the first base film region of the exemplary embodiment of (B), the first coating layer 302 and the second coating layer 303 are arranged up and down based on the metal layer 301, and the second transparent layer 304-1 is formed on the end of the second base film region side of the metal layer 301 instead of the first coating layer 302 and the second coating layer 303.

[0226] That is, the metal layer 301 is formed of a metal such as aluminum (Al), and may be a solid metal layer or a layer including a metal pattern according to an exemplary embodiment. The metal layer has a function of fixing the display device in some cases when the display device tends to return to the original state again when the display device is bent and folded.

[0227] The second coating layer 303 is disposed on the metal layer 301, and the first coating layer 302 is disposed thereon. On the other hand, the second coating layer 303 is disposed under the metal layer 301, and the first coating layer 302 is disposed thereunder.

[0228] The first coating layer 302 and the second coating layer 303 are formed of a transparent material such as polyimide, and in the present exemplary embodiment, the first coating layer 302 is formed using PI-H ( Polyimide film), and the second coating layer 303 uses TPI (thermoplastic polyimide).

[0229] However, according to an exemplary embodiment, only one coating layer may be disposed above or below the metal layer 301. When one coating layer is formed, the coating layer may be formed by using a polyimide-based material.

[0230] The second transparent layer 304-1 is formed on the end portion of the second base film region side of the metal layer 301 instead of the first coating layer 302 and the second coating layer 303. The size of the region other than the second transparent layer 304-1 and the first coating layer 302 and the second coating layer 303 may be various.

[0231] The second transparent layer 304-1 may be formed of the same material as the transparent layer 304, or may be formed of a different material therefrom. That is, OCR (Optically Clear Resin), OCA (Optically Clear Adhesive), or PSA (Pressure Sensitive Adhesive) may be used, or PET (Polyethylene Terephthalate) may be used.

[0232] and Fig.12 (B) Differently, the structure of the second transparent layer 304 - 1 may extend to the bottom of the metal layer 301 .

[0233] Next, describe Fig.13 An exemplary embodiment of .

[0234] Fig.13 An exemplary embodiment is shown and this is Fig.13 (A-2) is shown. Fig.13 (A-1) Explanation of manufacturing Fig.13 (A-2) Method of the exemplary embodiment.

[0235] refer to Fig.13(A-1) Describe the second basement membrane region.

[0236] like Fig.13 As shown in (A-1), the upper second coating layer 303 and the upper first coating layer 302 provided on the first base film region extend to the second base film region, and the right end is bent twice in the downward direction to have a shape extending toward the lower second coating layer 303 and the lower first coating layer 302 provided on the first base film region. As described above, the second base film region is bent into The upper second coating 303 and the upper first coating 302 of the structure are formed. (See Fig.13 (A-2))

[0237] On the other hand, refer to Fig.13 (A-2), the second base film region further includes an adhesive layer 326. That is, the adhesive layer 326 is formed in a space formed by bending of the upper second coating layer 303 and the upper first coating layer 302, so that the upper second coating layer 303 and the upper first coating layer 302 are no longer spread.

[0238] and Fig.13 Unlike the exemplary embodiments of the present invention, there may be only one coating layer, and the one coating layer may be bent as In this case, the one coating layer may be formed by using a polyimide-based material.

[0239] exist Figures 11 to 13 In each exemplary embodiment of Fig.10 Similarly, the first base film region and the second base film region are connected and then separated to form the base film 300 and the external base film 305. Then, the base film 300 and the external base film 305 are attached to the rear surface of the display panel 100.

[0240] In the above-described exemplary embodiments, the method of attaching after the base film portion 20 is divided into the base film 300 and the external base film 305 before being attached to the display panel portion 10 is described.

[0241] Next, refer to Fig.14 A method of separating the base film into the base film 300 and the outer base film 305 after the base film is attached is described.

[0242] Fig.14 is a view illustrating a method of manufacturing a flexible display device according to an exemplary embodiment.

[0243] Fig.14 Only the basement membrane is shown as the basement membrane portion. Fig.14 Different, it can further include a layer and a base film. In addition, Fig.14 use Fig.11 The exemplary embodiment of (B) serves as a base film.

[0244] Fig.14 (A) shows a state in which a base film portion consisting of only the base film is attached to the rear surface of the display panel 100 .

[0245] exist Fig.14 , the signal control chip 400 is indicated by a dotted line on the driving area of ​​the display panel 100 so as to be divided into the driving area and the display area. The signal control chip 400 is indicated by a dotted line because the signal control chip 400 can actually be installed after the base film portion is attached to the display panel 100.

[0246] like Fig.14 (A) If Fig.11 (B) The base film 300 is attached to the display panel 100, and the first base film portion and the second base film portion are not separated. In order to separate them, laser is irradiated to cut the first coating layer 302 and the second coating layer 303 in the bending area in the driving area of ​​the display panel 100. In this case, the portion disposed under the display area of ​​the display panel 100 is not damaged.

[0247] After laser irradiation, the Fig.14 (B) shows a structure. That is, the first base film portion 21 and the second base film portion 22 are separated and attached to the rear surface of the display panel 100. Here, the second base film portion 22 has a transparent structure and includes a separated first coating layer 302-1 and a separated second coating layer 303-1.

[0248] exist Fig.14 In the figure, the base film is used only as a base film part, the first base film part 21 is composed of the base film 300, and the second base film part 22 is composed of the external base film 305.

[0249] Since the outer base film is transparent, the alignment key formed at the portion where the signal control chip 400 is disposed is recognized from the bottom of the display panel 100 to mount the signal control chip 400 in a subsequent process. As a result, the signal control chip 400 can be aligned.

[0250] In the following, reference Fig.15 A flexible display device according to another exemplary embodiment of the inventive concept is described.

[0251] Fig.15 is a cross-sectional view of a flexible display device according to another exemplary embodiment.

[0252] exist Fig.15 In an exemplary embodiment of Fig.14 Instead, the first base film portion 21 and the second base film portion 22 are formed of materials different from each other.

[0253] That is to say, Fig.14An exemplary embodiment is a structure in which the second coating layer 303 of the first base film portion 21 and the first coating layer 302 are also present in the second base film portion 22 such that they are formed of the same material.

[0254] on the contrary, Fig.15 2 shows a structure in which the first base film portion 21 and the second base film portion 22 are formed separately and attached separately. That is, Fig.15 The second base film portion 22 of the exemplary embodiment includes a third transparent layer 306 and a fourth transparent layer 307 , and is formed of a material different from the first coating layer 302 and the second coating layer 303 of the first base film portion 21 .

[0255] That is to say, Fig.15 An exemplary embodiment is a case where the first base film 21 and the second base film 22 do not have layers corresponding to each other. Fig.15 The illustrated case is included in the exemplary embodiment of the present inventive concept.

[0256] exist Fig.15 In the exemplary embodiment, since the external base film is formed of only a transparent material, the alignment key formed at the portion where the signal control chip 400 is disposed is recognized from the bottom of the display panel 100 to mount the signal control chip 400 in a subsequent process. As a result, the signal control chip 400 can be aligned.

[0257] According to an exemplary embodiment, the second base film portion 22 may be composed of only one transparent layer.

[0258] exist Fig.14 and Fig.15 In the embodiment, the display panel 100 and the underlying base film portion are bonded by an adhesive, but the adhesive is not shown.

[0259] exist Fig.16 In an exemplary embodiment of the present invention, by using a metal sheet instead of using a Figure 1 The base film 300 - 1 is formed by using a base film of the metal layer shown.

[0260] Fig.16 is a cross-sectional view of a flexible display device according to another exemplary embodiment.

[0261] Fig.16 An exemplary embodiment is similar to Figure 1 but the difference is that a metal sheet is used instead of a metal layer.

[0262] Furthermore, when a metal sheet is used, the film layer 310 may be omitted according to an exemplary embodiment, so that Fig.16 Shown with Figure 1 Compared to a structure in which the film layer 310 is omitted. However, according to an exemplary embodiment, the film layer 310 may be added.

[0263] Various metals can be used for the metal sheet, such as aluminum (Al).

[0264] While the inventive concept has been described in connection with what are presently considered to be practical exemplary embodiments, it is to be understood that the inventive concept is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A flexible display device, comprising: A display panel, the display panel having a display area and a driving area, wherein a signal control chip for controlling the display panel is mounted on the driving area; a first base film portion, the first base film portion being disposed under the display area and including a metal layer; and The second base film portion is disposed under the driving area and is formed to be transparent.

2. The flexible display device according to claim 1, wherein: The first base film portion comprises: a base film including the metal layer; and An adhesive layer is attached to the bottom of the display area.

3. The flexible display device according to claim 2, wherein: The first base film portion further includes a film layer disposed between the adhesive layer and the base film, and Wherein the second basement membrane portion comprises: an outer adhesive layer formed of the same material as the adhesive layer of the first base film portion; and An outer film layer formed of the same material as the film layer of the first base film portion.

4. The flexible display device according to claim 1, wherein: The second base film portion includes a transparent layer provided in a layer corresponding to the metal layer of the first base film portion, and wherein the first base film portion and the second base film portion further include a coating layer, The first base film portion includes coating layers disposed above and below the metal layer, and The second base film portion includes coating layers disposed above and below based on the transparent layer.

5. The flexible display device according to claim 1, wherein: The first base film portion and the second base film portion further include a coating layer, respectively. The first base film portion includes a coating layer disposed above and below the metal layer, and The second base film portion includes only the coating layer.

6. The flexible display device according to claim 1, wherein: The first base film portion further comprises a coating, The second base film portion includes a transparent layer and a coating layer, The first base film portion includes a coating layer disposed above and below the metal layer, and The transparent layer is disposed on the coating layer in the second base film portion.

7. The flexible display device according to claim 1, wherein: The first base film portion and the second base film portion further include a coating layer, respectively. The first base film portion has two coating layers disposed above and below the metal layer, respectively. The second base film portion includes a coating layer having a curved structure, and further includes an adhesive layer to fix the curved structure of the coating layer.

8. The flexible display device according to claim 1, wherein: The metal layer is a solid metal layer or a layer or a metal sheet including a metal pattern, and The flexible display device further comprises: An alignment key is disposed in the driving area of ​​the display panel and is disposed adjacent to the signal control chip.

9. The flexible display device according to claim 8, further comprising: A touch panel disposed on the display panel and sensing touch; and A window is provided on the touch panel.

10. The flexible display device according to claim 8, further comprising an anti-crack layer disposed on the bending area, The bending area is arranged in the driving area and between the signal control chip and the display area.

11. An electronic device, comprising: A flexible display device according to any one of claims 1 to 10.

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