Abstract:
A rollable display device includes: a rollable display including a first end and a second end spaced apart from the first end; a first slider including a roller that supports the first end of the rollable display, the first slider being configured to roll the rollable display about the roller; and a second slider including a support that supports the second end of the rollable display while bending the second end of the rollable display, the second slider being slideable relative to the first slider.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority to and the benefit of Korean Patent Application No. 10-2016-0086185, filed on Jul. 7, 2016 in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference. 
       BACKGROUND 
     1. Field 
       [0002]    Aspects of one or more embodiments relate to a rollable display device. 
       2. Description of the Related Art 
       [0003]    A display device is a device displaying an image, and, recently, an organic light emitting diode display has received attention. 
         [0004]    A rollable display device is a device that includes a rollable display being rolled on or unrolled from a roller. The rollable display can be portable by reducing the overall size of the rollable display by rolling the rollable display on the roller. 
         [0005]    The above information disclosed in this Background section is only for enhancement of understanding of the background of the described technology 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 
       [0006]    According to an aspect of one or more embodiments, in a rollable display device, stability of a rollable display is improved when the rollable display is rolled on a roller or unrolled from the roller. 
         [0007]    According to one or more embodiments, a rollable display device includes: a rollable display including a first end and a second end spaced apart from the first end; a first slider including a roller that supports the first end of the rollable display, the first slider being configured to roll the rollable display about the roller; and a second slider including a support that supports the second end of the rollable display while bending the second end of the rollable display, the second slider being slideable relative to the first slider. 
         [0008]    The rollable display device may further include: a printed circuit board that is arranged in the second slider and corresponding to a bottom side of the rollable display; and a flexible printed circuit arranged in the support and connecting between the printed circuit board and the second end of the rollable display. 
         [0009]    The flexible printed circuit may include: a chip opposing the bottom side of the rollable display; and a heat dissipating portion surrounding the chip. 
         [0010]    The second slider may further include a reinforcing portion between the support and the flexible printed circuit. 
         [0011]    The second slider may be sliceable in the first slider. 
         [0012]    The rollable display device may further include a third slider between the first slider and the second slider, wherein the second slider may be slideable in the third slider and the third slider may be slideable in the first slider. 
         [0013]    The flexible printed circuit may be bent in a plurality of directions. 
         [0014]    The first slider may be slideable in the second slider. 
         [0015]    The rollable display device may further include a fourth slider between the first slider and the second slider, wherein the first slider may be slideable in the fourth slider and the fourth slider may be slideable in the second slider. 
         [0016]    The flexible printed circuit may be bent along an interior wall of the support. 
         [0017]    The support may include a curved interior wall. 
         [0018]    The rollable display device may further include at least one elastic member between the first slider and the second slider. 
         [0019]    According to an exemplary embodiment, in the rollable display device, stability of the rollable display is improved when the rollable display is rolled on a roller or unrolled from the roller. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1  is a perspective view of a rollable display device according to an exemplary embodiment. 
           [0021]      FIG. 2  is a cross-sectional view of the rollable display device of  FIG. 1 , taken along the line II-II. 
           [0022]      FIG. 3  is a cross-sectional view of the rollable display device of  FIG. 1 , taken along the line 
           [0023]      FIG. 4  is a cross-sectional view of the rollable display device of  FIG. 2 , shown in a state in which a rollable display of the rollable display device is unrolled from a roller. 
           [0024]      FIG. 5  is a cross-sectional view of a rollable display device according to another exemplary embodiment. 
           [0025]      FIG. 6  is a cross-sectional view of a rollable display device according to another exemplary embodiment. 
           [0026]      FIG. 7  is a cross-sectional view of the rollable display device of  FIG. 6 , shown in a state in which a rollable display of the rollable display device is unrolled from a roller. 
       
    
    
     DETAILED DESCRIPTION 
       [0027]    The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments of the present invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention, 
         [0028]    The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification. 
         [0029]    In addition, the size and thickness of each configuration shown in the drawings may be arbitrarily shown for better understanding and ease of description, but the present invention is not limited thereto. In the drawings, the thicknesses of layers, films, panels, regions, etc., may be exaggerated for clarity. 
         [0030]    Further, it will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. Throughout the specification, the word “on” means positioning on or below the object portion, but does not necessarily mean positioning on the upper side of the object portion based on a gravitational direction. 
         [0031]    In addition, unless explicitly described to the contrary, the word “comprise” and variations, such as “comprises” or “comprising,” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. 
         [0032]    A rollable display device according to an exemplary embodiment will be described with reference to  FIG. 1  to  FIG. 4 . 
         [0033]      FIG. 1  is a perspective view of a rollable display device according to an exemplary embodiment.  FIG. 2  is a cross-sectional view of the rollable display device of  FIG. 1 , taken along the line II-II.  FIG. 3  is a cross-sectional view of the rollable display device of  FIG. 1 , taken along the line III-III. 
         [0034]      FIG. 1  to  FIG. 3  show a rollable display device in a state in which a rollable display of the rollable display device is wound on a roller, 
         [0035]    As shown in  FIG. 1  to  FIG. 3 , a rollable display device  1000  includes a rollable display  100 , a first slider  200 , a second slider  300 , a third slider  400 , a printed circuit board (PCB)  500 , a flexible printed circuit (FPC)  600 , and an elastic member  700 . 
         [0036]    The rollable display  100  displays an image. The rollable display  100  may be rolled on a roller  230  of the first slider  200  or unrolled from the roller  230 . The rollable display  100  may include a flexible substrate or a film that is disposed opposite the rollable display  100 , interposing at least one of liquid crystal, an organic light emitting diode, electronic ink, and the like. The rollable display  100  may be a transparent or light-transmissive type of display which enables viewing to the outside through the rollable display  100 . A touch sensor that senses a touch operation may be located as a touch film, a touch sheet, or a touch panel at a front side of the rollable display  100 . 
         [0037]    The rollable display  100  includes a first end  110  and a second end  120  that is disposed or spaced apart from the first end  110 . The first end  110  of the rollable display  100  is supported by the roller  230  of the first slider  200 , and the second end  120  of the rollable display  100  is supported by a support  340  of the second slider  300 . 
         [0038]    The first slider  200  is provided at a bottom side of the rollable display  100  and supports the bottom side of the rollable display  100 . The first slider  200  slides against or relative to the third slider  400  and the second slider  300 . The third slider  400  and the second slider  300  may slide into the first slider  200 . 
         [0039]    The first slider  200  includes a first opening  210 , a first sliding portion  220 , and the roller  230 . 
         [0040]    The first opening  210  opens an upper side of the rollable display  100 . A first side  201  of the first slider  200 , which forms the first opening  210 , has a curved shape, and, thus, the upper side of the rollable display  100 , supported by the roller  230 , is opened while being curved. 
         [0041]    The first sliding portion  220  is provided at a bottom side of the rollable display  100 , and supports the bottom side of the rollable display  100 . The first sliding portion  220  neighbors the roller  230 . The first sliding portion  220  includes a first upper portion  221  that opposes the bottom side of the rollable display  100 . In an embodiment, the first upper portion  221  of the first sliding portion  220  has a thickness that is thin compared to other portions of the first sliding portion  220 . The first upper portion  221  supports the rollable display  100 . 
         [0042]    The roller  230  is equipped in the first slider  200 , and supports the first end  110  of the rollable display  100 . 
         [0043]    The roller  230  may wind or unwind the rollable display  110  by rotating in the clockwise direction or the counterclockwise direction. 
         [0044]    The upper side of the rollable display  110 , opened by the first opening  210  by the roller  230 , maintains the bent shape. 
         [0045]    The second slider  300  slides against or relative to the first slider  200 . The second slider  300  may slide into the first slider  200 . The printed circuit board  500  is provided in the second slider  300 , and the printed circuit board  500  is connected with the rollable display  100  through the flexible printed circuit  600 . In an embodiment, the second slider  300  includes a second opening  310 , a second sliding portion  320 , a curved shape maintaining portion  330 , the support  340 , and a reinforcing portion  350 . 
         [0046]    The second opening  310  opens the upper side of the rollable display  100 . A second side  301  of the second slider  300 , which forms the second opening  310 , has a curved shape, and, thus, the upper side of the rollable display  100 , supported by the support  340 , is opened while being curved. 
         [0047]    The second sliding portion  320  is provided at the bottom side of the reliable display  100 , and supports the bottom side of the rollable display  100 . The second sliding portion  320  neighbors the support  340 . The second sliding portion  320  includes a second upper portion  321  that opposes the bottom side of the rollable display  100 . In an embodiment, the second upper portion  321  of the second sliding portion  320  has a thickness that is thin compared to other portions of the second sliding portion  320 . The second upper portion  321  supports the rollable display  100 . The second sliding portion  320  may slide into the first sliding portion  220 . The printed circuit board  500  is provided in the second sliding portion  320 , and the printed circuit board  500  is connected with the rollable display  100  through the flexible printed circuit  600 . 
         [0048]    The curved shape maintaining portion  330  is disposed between the sliding portion  320  and the support  340  corresponding to the bottom side of the rollable display  100 . The curved shape maintaining portion  330  includes a curved surface, and the curved surface contacts the bottom side of the rollable display  100 . The upper side of the rollable display  100 , opened by the second opening  310  by the curved shape maintaining portion  330 , maintains a bent shape. 
         [0049]    The support  340  supports the second end  120  of the rollable display  100  by bending the second end  120 . The flexible printed circuit  600  that is disposed between the second end  120  of the rollable display  100  and the printed circuit board  500  is provided in the support  340 . The support  340  includes a curved interior wall, and the reinforcing portion  350  is attached to the interior wall. 
         [0050]    The reinforcing portion  350  is disposed between the support  340  and the flexible printed circuit  600 . The reinforcing portion  350  may be attached to the interior wall of the support  340 . The reinforcing portion  350  suppresses interference of the flexible printed circuit  600 , which may be caused by the support  340 . 
         [0051]    The third slider  400  connects between the first slider  200  and the second slider  300 . In an embodiment, the third slider  400  slides into the first slider  200 , and the second slider  300  slides into the third slider  400 . That is, the second slider  300  may slide together with the third slider  400  into the first slider  200 . 
         [0052]    The third slider  400  includes a third sliding portion  420 . 
         [0053]    The third sliding portion  420  is provided at the bottom side of the rollable display  100 , and supports the bottom side of the rollable display  100 . The third sliding portion  420  is disposed between the first sliding portion  220  and the second sliding portion  320 . The third sliding portion  420  includes a third upper portion  421  that opposes the bottom side of the rollable display  100 . In an embodiment, the third upper portion  421  of the third sliding portion  420  has a thickness that is thin compared to other portions of the third sliding portion  420 . The third upper portion  421  supports the rollable display  100 . The third sliding portion  420  connects between the first sliding portion  220  and the second sliding portion  320 . In an embodiment, the third sliding portion  420  slides into the first sliding portion  220 , and the second sliding portion  320  slides into the third sliding portion  420 . That is, the second sliding portion  320  may slide together with the third sliding portion  420  into the first sliding portion  220 . 
         [0054]    In an embodiment, at least one of a connection between the first sliding portion  220  and the third sliding portion  420  and a connection between the third sliding portion  420  and the second sliding portion  320  may have a rail structure RS (e.g., an engraved or embossed rail structure). Such a rail structure RS causes the second sliding, portion  320  to be slide-guided to the first sliding portion  220  together with the third sliding portion  420  to thus be slideable into the first sliding portion  220 . 
         [0055]    The printed circuit board  500  is provided in the second sliding portion  320  that is disposed in the second slider  300 , corresponding to the bottom side of the rollable display  100 . The printed circuit board  500  may include a substrate where a circuit is printed and a plurality of chips that are mounted to the substrate. The printed circuit board  500  is connected with the rollable display  100  through the flexible printed circuit  600 . 
         [0056]    The flexible printed circuit  600  is provided in the support  340 . The flexible printed circuit  600  connects between the printed circuit board  500  and the second end  120  of the rollable display  100 . In an embodiment, the flexible printed circuit  600  includes a chip  610  that opposes the bottom side of the rollable display  100  and a heat dissipation portion  620  that surrounds the chip  610 . The chip  610  of the flexible printed circuit  600  may be connected to the flexible printed circuit  600  in a form of a chip on film (COF). In an embodiment, the flexible printed circuit  600  is bent several times in different directions to connect between the second end  120  of the rollable display  100  and the printed circuit board  500 . The flexible printed circuit  600  extends into the second sliding portion  320  while penetrating the curved shape maintaining portion  330  from the support  340  of the second slider  300 . The flexible printed circuit  600  is supported by the curved shape maintaining portion  330 . 
         [0057]    The elastic member  700  is provided between the first sliding portion  220  and the third sliding portion  420  and between the third sliding portion  420  and the second sliding portion  320 . The elastic member  700  may generate an elastic force or an elastic restoring force in a direction in which the first sliding portion  220  and the third sliding portion  420  move away from each other and a direction in which the third sliding portion  420  and the second sliding portion  320  move away from each other. The elastic member  700  may include a spring or a shock absorber, or any other suitable device, as long as it can generate the elastic force or elastic restoring force. The elastic force or elastic restoring force generated from the elastic member  700  that is disposed between the first sliding portion  220  and the third sliding portion  420  may be stronger than that generated from the elastic member  700  that is disposed between the third sliding portion  420  and the second sliding portion  320 . 
         [0058]    In an embodiment, the elastic member  700  disposed between the first sliding portion  220  and the third sliding portion  420  generates stronger elastic force or elastic restoring force compared to the elastic member  700  disposed between the third sliding portion  420  and the second sliding portion  320 , such that the third sliding portion  420  slides first in a direction away from the first sliding portion  220 , and then the second sliding portion  320  slides in a direction away from the third sliding portion  420 . At least one elastic member  700  may be provided between the first slider  200  and the second slider  300 . 
         [0059]    Herein, referring to  FIG. 4 , the rollable display  100  that is unrolled from the roller  230  in the rollable display device  1000  according to the exemplary embodiment will be described. 
         [0060]      FIG. 4  is a cross-sectional view of the rollable display  100 , shown in a state of being unrolled from the roller  230  of the rollable display device  1000  of  FIG. 2 . 
         [0061]    As shown in  FIG. 4 , when the second slider  300  slides with the third slider  400  in the direction away from the first slider  200  by the elastic force or elastic restoring force of the elastic member  700 , the rollable display  100  is unrolled from the roller  230 . 
         [0062]    As the rollable display  100  is unrolled from the roller  230 , a display area of the rollable display  100 , viewed from the outside, can be expanded. 
         [0063]    In addition. The upper side of the reliable display  100 , opened by the first opening  210  of the first slider  200 , maintains a bent shape by the roller  230 , and the upper side of the rollable display  100 , opened by the second opening  310  of the second slider  300 , maintains a bent shape by the curved shape maintaining portion  330 . 
         [0064]    That is, in a state that the rollable display  100  is rolled on the roller  230  and in a state that the rollable display  100  is unrolled from the roller  230 , the rollable display  100  is opened by the first opening  210  of the first slider  200  and the second opening  310  of the second slider  300  such that the upper side of the rollable display  100 , corresponding to the roller  230  and the curved shape maintaining portion  300 , maintains the bent shape. 
         [0065]    In addition, as the second sliding portion  320  of the second slider  300  slides together with the third sliding portion  420  of the third slider  400  into the first sliding portion  220  of the first slider  200 , the first upper portion  221  of the first sliding portion  220 . The second upper portion  321  of the second sliding portion  320 , and the third upper portion  421  of the third sliding portion  420  support the rollable display  100 . 
         [0066]    That is, in the state that the rollable display  100  is rolled on the roller  230  and in the state that the rollable display  100  is unrolled from the roller  230 , the rollable display  100  is supported by the first sliding portion  220 , the second sliding portion  320 , and the third sliding portion  420  such that the upper side of the rollable display  100 , corresponding to the first sliding portion  220 , the second sliding portion  320 , and the third sliding portion  420  is substantially maintained to be flat. 
         [0067]    In an embodiment, the first upper portion  221 , the second upper portion  321 , and the third upper portion  421  respectively have thin thicknesses compared to other portions of the first sliding portion  220 , the second sliding portion  320 , and the third sliding portion  420 , and, therefore, the upper side of the rollable display  100 , corresponding to the first sliding portion  220 , the second sliding portion  320 , and the third sliding portion  420  can be prevented or substantially prevented from being stepped. 
         [0068]    In addition, the second end  120  of the rollable display  100  is bent and thus supported by the support  340 , the printed circuit board  500  is disposed in the second sliding portion  320  of the second slider  300 , the flexible printed circuit board  600  that is bent several times to connect between the second end  120  of the rollable display  100  and the printed circuit board  500  is supported by the curved shape maintaining portion  330 , and the flexible printed circuit  600  can be prevented or substantially prevented from being interfered with by the support  340  by the reinforcing portion  350 . 
         [0069]    That is, in the state that the rollable display  100  is rolled on the roller  230  and in the state that the rollable display  100  is unrolled from the roller  230 , the second end  120  of the rollable display  100  is supported by the second slider  300 , the printed circuit board  500  is disposed in the second slider  300 , the flexible printed circuit  600  is supported by the second slider  300  while connecting between the rollable display  100  and the printed circuit board  500 , and the flexible printed circuit  600  is prevented or substantially prevented from being interfered with by the second slider  300 , and accordingly, generation of interference in each of the rollable display  100 , the printed circuit board  500 , and the flexible printed circuit  600  can be suppressed. 
         [0070]    As described above, when the rollable display  100  is rolled on the roller  230  or unrolled from the roller  230 , stability of each of the rollable display  100 , the printed circuit board  500 , and the flexible printed circuit  600  of the rollable display device  1000  can be improved. 
         [0071]    Referring to  FIG. 5 , a rollable display device according to another exemplary embodiment will be described. Herein, a description of portions that are different from those of the reliable display device  1000  according to the embodiment described above will be provided. 
         [0072]      FIG. 5  is a cross-sectional view of a rollable display device according to another exemplary embodiment. 
         [0073]    As shown in  FIG. 5 , a rollable display device  1000 ′ according to another exemplary embodiment includes a rollable display  100 , a first slider  200 , a second slider  300 , a third slider  400 , a printed circuit board  500 , a flexible printed circuit  600 ′, and an elastic member  700 . 
         [0074]    The flexible printed circuit  600 ′ is provided in a support  340 . The flexible printed circuit  600 ′ connects between the printed circuit board  500  and a second end of the rollable display  100 . The flexible printed circuit  600 ′ is bent several times in different directions to connect between the second end  120  of the rollable display  100  and the printed circuit board  500 . 
         [0075]    The support  340  includes a curved interior wall, and a reinforcing portion  350  is attached to the interior wall and the flexible printed circuit  600 ′ is bent along the interior wall of the support  340 . 
         [0076]    In an embodiment, the reinforcing portion  350  is attached to the interior wall of the support  340  and the flexible printed circuit  600 ′ is bent along the interior wall of the support  340  with the reinforcing portion therebetween such that the flexible printed circuit  600 ′ can be suppressed from being interfered with by the support  340 . 
         [0077]    That is, in a state that the rollable display  100  is rolled on a roller  230  and in a state that the rollable display  100  is unrolled from the roller  230 , the flexible printed circuit  600 ′ can be suppressed from being interfered with by the support  340  such that generation of interference in the flexible printed circuit  600 ′ can be suppressed. 
         [0078]    As described above, when the rollable display  100  is rolled on the roller  230  or unrolled from the roller  230 , stability of the flexible printed circuit  600 ′ of the rollable display device  1000 ′ can be improved, 
         [0079]    Referring to  FIG. 6 , a rollable display device according to another exemplary embodiment will be described. Herein, a description of portions that are different from those of the rollable display device according to the embodiment described above will be provided. 
         [0080]      FIG. 6  is a cross-sectional view of a rollable display device according to another exemplary embodiment. 
         [0081]    As shown in  FIG. 6 , a rollable display device  1000 ″ according to another exemplary embodiment includes a rollable display  100 , a first slider  200 , a second slider  300 , a fourth slider  900 , a printed circuit board  500 , a flexible printed circuit  600 , and an elastic member  700 . 
         [0082]    The rollable display  100  includes a first end  110  and a second end  120  that is disposed or spaced apart from the first end  110 . The first end  110  of the rollable display  100  is supported by a roller  230  of the first slider  200 , and the second end  120  of the rollable display  100  is supported by a support  340  of the second slider  300 . 
         [0083]    The first slider  200  is provided at a bottom side of the rollable display  100  and supports the bottom side of the rollable display  100 . The first slider  200  slides against or relative to the fourth slider  900  and the second slider  300 . The fourth slider  900  and the first slider  200  may slide into the second slider  300 . 
         [0084]    The first slider  200  includes a first opening  210 , a first sliding portion  220 , and the roller  230 . The first sliding portion  220  includes a first upper portion  221 , and slides into a second sliding portion  320  of the second slider  300 . 
         [0085]    The second slider  300  slides against or relative to the first slider  200 . The first slider  200  may slide into the second slider  300 . The printed circuit board  500  is disposed in the second slider  300 , and the printed circuit board  500  is connected with the rollable display  100  through the flexible printed circuit  600 . The second slider  300  includes a second opening  310 , the second sliding portion  320 , a curved shape maintaining portion  330 , a support  340 , and a reinforcing portion  350 . 
         [0086]    The second sliding portion  320  includes a second upper portion  321 . The first sliding portion  220  may slide into the second sliding portion  320 . The printed circuit board  500  is disposed at the outer side of the second sliding portion  320 , and the printed circuit board  500  is connected with the rollable display  100  through the flexible printed circuit  600 . 
         [0087]    The fourth slider  900  connects between the first slider  200  and the second slider  300 . In an embodiment, the fourth slider  900  slides into the second slider  300 , and the first slider  200  slides into the fourth slider  900 . That is, the first slider  200  may slide together with the fourth slider  900  into the second slider  300 . 
         [0088]    The fourth slider  900  includes a fourth sliding portion  920 . 
         [0089]    The fourth sliding portion  920  is provided at the bottom side of the rollable display  100  and supports the bottom side of the rollable display  100 . The fourth sliding portion  920  is disposed between the first sliding portion  220  and the second sliding portion  320 . The fourth sliding portion  920  includes a fourth upper portion  921  that opposes the bottom side of the rollable display  100 . The fourth sliding portion  920  connects between the first sliding portion  220  and the second sliding portion  320 . In an embodiment, the fourth sliding portion  920  slides into the second sliding portion  320 , and the first sliding portion  220  slides into the fourth sliding portion  220 . That is, the first sliding portion  220  may slide together with the fourth sliding portion  920  into the second sliding portion  320 . 
         [0090]    The printed circuit board  500  is disposed in a portion of the second slider  300  which is outside the second sliding portion  320 . 
         [0091]    The flexible printed circuit  600  is disposed in the support  340 . The flexible printed circuit  600  is bent along the interior wall of the support  340  and connects between the second end  120  of the rollable display  100  and the printed circuit board  500 . 
         [0092]    The elastic member  700  is disposed between the first sliding portion  220  and the fourth sliding portion  920  and between the fourth sliding portion  920  and the second sliding portion  320 . The elastic member  700  may generate an elastic force or elastic restoring force in a direction that the first sliding portion  220  and the fourth sliding portion  920  move away from each other and a direction that the fourth sliding portion  920  and the second sliding portion  320  move away from each other. 
         [0093]    Herein, referring to  FIG. 7 , the rollable display  100  of the rollable display device  1000 ″ in a state of being unrolled from the roller  230  will be described. 
         [0094]      FIG. 7  is a cross-sectional view of the rollable display device  1000 ″ in which the rollable display  100  of  FIG. 6  is unrolled from the roller  230 . 
         [0095]    As shown in  FIG. 7 , when the first slider  200  slides in a direction away from the second slider  300  together with the fourth slider  900  by the elastic force or elastic restoring force, the rollable display  100  is unrolled from the roller  230 . 
         [0096]    As the reliable display  100  is unrolled from the roller  230 , a display area of the rollable display  100 , viewed from the outside is expanded. 
         [0097]    As the first sliding portion  220  of the first slider  200  slides into the second sliding portion  320  of the second slider  300  together with the fourth sliding portion  920  of the fourth slider  900 , the first upper portion  221  of the first sliding portion  220 , the second upper portion  321  of the second sliding portion  320 , and the fourth upper portion  921  of the fourth sliding portion  920  support the rollable display  100 . 
         [0098]    That is, in a state that the rollable display  100  is rolled on the roller  230  and in a state that the rollable display  100  is unrolled from the roller  230 , the rollable display  100  is supported by the first sliding portion  220 , the second sliding portion  320 , and the fourth sliding portion  920  such that the upper side of the rollable display  100 , corresponding to the first sliding portion  220 , the second sliding portion  320 , and the fourth sliding portion  920 , is substantially maintained to be flat. 
         [0099]    In an embodiment, the first upper portion  221 , the second upper portion  321 , and the fourth upper portion  921  respectively have thin thicknesses compared to other portions of the first sliding portion  220 , the second sliding portion  320 , and the fourth sliding portion  920 , and, therefore, the upper side of the rollable display  100 , corresponding to the first sliding portion  220 , the second sliding portion  320 , and the fourth sliding portion  920 , can be prevented or substantially prevented from being stepped. 
         [0100]    In addition, the second end  120  of the rollable display  100  is bent and thus supported by the support  340 , the printed circuit board  500  is disposed in the second slider  300 , and the flexible printed circuit  600  that may be bent several times to connect the second end  120  of the rollable display  100  and the printed circuit board  500  is bent along the interior wall of the support  340  where the reinforcing portion  350  is provided such that the flexible printed circuit  600  can be prevented or substantially prevented from being interfered with by the support  340 . 
         [0101]    That is, in the state that the rollable display  100  is rolled on the roller  230  and in the state that the rollable display  100  is unrolled from the roller  230 , the second end  120  of the rollable display  100  is supported by the second slider  300 , the printed circuit board  500  is disposed in the second slider  300 , the flexible printed circuit  600  is supported by the second slider  300  while connecting between the rollable display  100  and the printed circuit board  500 , and the flexible printed circuit  600  is prevented or substantially prevented from being interfered with by the second slider  300 , and, accordingly, generation of interference in each of the rollable display  100 , the printed circuit board  500 , and the flexible printed circuit  600  can be suppressed. 
         [0102]    As described above, when the rollable display  100  is rolled on the roller  230  or unrolled from the roller  230 , stability of each of the rollable display  100 , the printed circuit board  500 , and the flexible printed circuit  600  of the rollable display device  1000  can be improved, 
         [0103]    While this disclosure has been described in connection with what are presently considered to be some practical example embodiments, it is to be understood that the present invention 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,