Patent Publication Number: US-2022214718-A1

Title: Multi-directional extension apparatus and method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a bypass continuation of International Application No. PCT/KR2021/017756, filed on Nov. 29, 2021, which claims priority to Korean Patent Application No. 10-2020-0165038, filed on Nov. 30, 2020, in the Korean Intellectual Property Office, and to Korean Patent Application No. 10-2021-0054339, filed on Apr. 27, 2021, in the Korean Intellectual Property Office, the disclosures of which are herein incorporated by reference in their entirety. 
    
    
     BACKGROUND 
     1. Field 
     One or more embodiments of the instant disclosure generally relate to an electronic apparatus, and more specifically, an electronic apparatus with improved structure so that its display is extendible in multiple directions. 
     2. Description of Related Art 
     Electronic apparatuses such as TV, monitor, communication terminal, gaming machine, multimedia device, portable computer, image capturing device, or the like, have a display displaying image information. Traditional displays cannot be bent or folded, so the sizes of the electronic apparatuses including the displays depend on the sizes of the displays. Thus a problem existed in the art where the size of the electronic apparatus needed to increase as the screen area of the display is increased, since large displays are often desired by users. 
     Flexible displays that could be bent have been developed. As these flexible displays are folded, the bent area of the display may have a certain radius of curvature. Applying these flexible displays, an electronic apparatus may include a display that can be wrapped around a roller and the display may be released from the roller and unfolded as needed. However, there is a problem in that such a conventional rollable display may only be extended in one direction, but may not be extended in multiple directions. 
     SUMMARY 
     According to an embodiment, an electronic apparatus includes a first display comprising a first side surface disposed along a first direction and a second side surface disposed along a second direction perpendicular to the first direction; a flexible second display disposed behind of the first display and comprising a main region, a first region extending from the main region toward the first side surface, and a second region extending from the main region toward the second side surface; a first roller configured to wind or unwind the first region and movable along the first direction; and a second roller configured to wind or unwind the second region and movable along the second direction, and the first roller may move along the first direction based on a rolling operation of the second roller, and wherein the second roller may move along the second direction based on a rolling operation of the first roller. 
     The first roller may be disposed adjacent to the first side surface along the first direction, and the second roller may be disposed adjacent to the second side surface along the second direction. 
     The first roller may have a first rotating axis in parallel with the first direction, and the second roller may have a second rotating axis in parallel with the second direction. 
     The second display may have an “L” shape. 
     The electronic apparatus may further include a first driving device configured to move the first and second rollers linearly in the first and second directions; and a second driving device configured to rotate the first and second rollers. 
     The first driving device may include a first motor configured to move the first roller along the first direction and a second motor configured to move the second roller along the second direction, and the second driving device may include a third motor configured to rotate the first roller and a fourth motor configured to rotate the second roller. 
     The electronic apparatus may further include a sensor configured to sense a pulling direction of the second display; and a processor configured to control the first and second driving devices based on the pulling direction sensed by the sensor so that the second display is moved to a preset position. 
     The processor may control the first motor so that the first roller moves in the first direction, and control the fourth motor so that the second roller unwinds the second region in the first direction, when the pulling direction is the first direction. 
     The processor may control the second motor so that the second roller moves in the second direction, and control the third motor so that the first roller unwinds the first region in the second direction, when the pulling direction is the second direction. 
     The processor may control the first motor and the third motor so that the first roller unwinds the first region in the second direction while moving in the first direction, and control the second and fourth motors so that the second roller unwinds the second region in the first direction while moving in the second direction, when the pulling direction is a diagonal direction. 
     The electronic apparatus may further include a first frame supporting the first and second side surfaces of the first display; a second frame slidable in the first direction with respect to the first frame; a third frame slidable in the second direction with respect to the first frame; and a fourth frame slidable in the second direction with respect to the second frame and slidable in the first direction with respect to the third frame, and each of the first frame, the second frame, the third frame, and the fourth frame may have an “L” shape. 
     The first frame may include a first vertical area supporting the first side surface and a first horizontal area supporting the second side surface, the second frame may include a second vertical area slidable in the first direction with respect to the first vertical area and a second horizontal area disposed perpendicular to the second vertical area, the third frame may include a third horizontal area slidable in the second direction with respect to the first horizontal area and a third vertical area disposed perpendicular to the third horizontal area, and the fourth frame may include a fourth horizontal area slidable in the second direction with respect to the second horizontal area and a fourth vertical area slidable in the first direction with respect to the third vertical area . 
     The electronic apparatus may further include a first guide roller and a second guide roller disposed in parallel with the first and second rollers, respectively; and a first supporting member and a second supporting member of which one end is connected to one end of the first and second regions, respectively, and other end is wound around the first and second guide rollers, respectively. 
     A part of the first region may be disposed in parallel with the first display between the first roller and the first guide roller, and a part of the second region may be disposed in parallel with the first display between the second roller and the second guide roller. 
     The electronic apparatus may further include a first auxiliary roller, disposed in parallel with the first roller between the first roller and the first display, for guiding a moving path of the first region; and a second auxiliary roller, disposed in parallel with the second roller between the second roller and the first display, for guiding a moving path of the second region. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view of an electronic apparatus according to one embodiment of the disclosure; 
         FIG. 2  is a plan view illustrating a state in which the second display is extended in the electronic apparatus of  FIG. 1 ; 
         FIG. 3  is a plan view illustrating a second display wound around first and second rollers; 
         FIG. 4  are views illustrating the operation in which the second display extends along the first direction; 
         FIG. 5  are views illustrating the operation in which the second display extends along the second direction; 
         FIG. 6  are views illustrating the operation of the second display extending along a diagonal direction; 
         FIG. 7  is a block diagram illustrating an electronic apparatus according to one embodiment of the disclosure; 
         FIG. 8  is a flowchart illustrating a control process of the electronic apparatus according to one embodiment of the disclosure; 
         FIG. 9  is an exploded perspective view of a plurality of frames according to one embodiment of the disclosure; 
         FIG. 10  is a view illustrating the placement of a plurality of frames according to the extension direction of the second display; 
         FIG. 11  is a side view illustrating the process by which the auxiliary roller guides the direction of movement of the second display; and 
         FIG. 12  is a side view illustrating the process by which the second display extends in a state where one end of the second display is connected to a support member wounded around a guide roller. 
     
    
    
     DETAILED DESCRIPTION 
     Examples described hereinafter are provided for comprehensive understanding of the disclosure, and it should be understood that various changes can be made to examples described herein and the disclosure can be embodied in different forms. In addition, in the following description, detailed descriptions of well-known functions or configurations may be omitted so as to not obscure the subject matter of the disclosure. In addition, it should be noted that the drawings are provided for comprehensive understanding of the disclosure, and are not illustrated as really scaled, and the dimensions of some elements may be exaggerated for clarity and convenience. 
     The terms used in the present specification and the claims are general terms identified in consideration of the functions of the various embodiments of the disclosure. However, these terms may vary depending on intention, technical interpretation, emergence of new technologies, and the like of those skilled in the related art. Some terms may be selected by an applicant arbitrarily, and the meaning thereof will be described in the detailed description. Unless there is a specific definition of a term, the term may be construed based on the overall contents and technological understanding of those skilled in the related art. 
     In this specification, the expressions “have,” “may have,” “include,” or “may include” or the like represent presence of a corresponding feature (for example: components such as numbers, functions, operations, or parts) and does not exclude the presence of additional feature. 
     Since the components required for the description of each embodiment of the disclosure have been described herein, the embodiment is not limited thereto. Thus, some components may be modified or omitted and other components may be added. In addition, the components may be distributed and arranged in different independent devices. 
     Furthermore, although the embodiments of the disclosure will be described in detail with reference to the accompanying drawings and the contents set forth in the accompanying drawings, the disclosure is not limited to the embodiments. 
     An electronic apparatus in accordance with various embodiments of the disclosure may include at least one of, for example, smartphones, tablet personal computers (PCs), mobile phones, video telephones, electronic book readers, desktop PCs, laptop PCs, netbook computers, workstations, servers, a personal digital assistance (PDA), a portable multimedia player (PMP), an MP 3  player, a medical device, a camera, or a wearable device. According to various embodiments, the wearable device may include any one or any combination of the accessory type (e.g., as a watch, a ring, a bracelet, an ankle bracelet, a necklace, a pair of glasses, or a head-mounted-device (HMD)); a fabric or a garment-embedded type (e.g., an electronic clothing), a skin-attached type (e.g., a skin pad or a tattoo); or a bio-implantable circuit. 
     In some embodiments, the electronic apparatus may be a home appliance. In some embodiments, the home appliance may include at least one of, for example, a television, a digital video disk (DVD) player, an audio system, a refrigerator, air-conditioner, a cleaner, an oven, a microwave, a washing machine, an air purifier, a set top box, a home automation control panel, a security control panel, a TV box (e.g., SAMSUNG HOMESYNC, APPLE TV, or GOOGLE TV), a game console (e.g., XBOX, PLAYSTATION), an electronic dictionary, an electronic key, a camcorder, or an electronic frame. 
     In other embodiments, the electronic apparatus may include at least one of a variety of medical devices (e.g., various portable medical measurement devices such as a blood glucose meter, a heart rate meter, a blood pressure meter, or a temperature measuring device), magnetic resonance angiography (MRA), magnetic resonance imaging (MRI), computed tomography (CT), or ultrasonic wave device, etc.), a navigation system, a global navigation satellite system (GNSS), an event data recorder (EDR), a flight data recorder (FDR), an automotive infotainment devices, a marine electronic equipment (e.g., marine navigation devices, gyro compasses, etc.), avionics, a security device, a car head unit, industrial or domestic robots, a drone, an automated teller machine (ATM), a point of sale (POS) of a store, or an Internet of Things (IoT) device (e.g., light bulbs, sensors, sprinkler devices, fire alarms, thermostats, street lights, toasters, exercise equipment, hot water tanks, heater, boiler, etc.). 
     According to an embodiment, the electronic apparatus may be implemented as a part of building/structure, an electronic board, an electronic signature receiving device, a projector, or various measuring devices (e.g., water, electricity, gas, or electromagnetic wave measuring devices, or the like), or the like. In various embodiments, the electronic apparatus may be one or more of the various devices described above or combination of the devices. The electronic apparatus according to an embodiment may be a flexible electronic apparatus. The electronic apparatus is not limited to the devices described above, and may include a new electronic apparatus according to technology development. 
     Hereinafter, the disclosure will be described in greater detail with reference to the attached drawings. 
       FIG. 1  is a plan view of an electronic apparatus according to one embodiment of the disclosure.  FIG. 2  is a plan view illustrating a state in which the second display is extended in the electronic apparatus of  FIG. 1 . and  FIG. 3  is a plan view illustrating a second display wound around first and second rollers. 
     Referring to  FIGS. 1 to 3 , an electronic apparatus  1  according to an embodiment may include a first display  100 , a second display  200 , a first roller  300 , and a second roller  400 . 
     The first and second displays  100  and  200  may display various information (e.g., multimedia data or text data, etc.) to the user. The first and second displays  100  and  200  may include, for example, liquid crystal display (LCD), light-emitting diode (LED) display, organic light-emitting diode (OLED) display, microelectromechanical systems (MEMS) display, electronic paper display, or flexible display that can be bent or curved. 
     The first and second displays  100  and  200  may also display various content (e.g., text, images, video, icons, or symbols, etc.) to the user, for example. The first and second displays  100  and  200  may include a touch screen, and may receive, for example, a touch, gesture, proximity, or hovering input using a portion of the user&#39;s body. 
     The first display  100  may be a rigid display which is not flexible and the second display  200  may be a flexible display which is flexible, so that it can be folded or rolled. 
     The second display  200  may be disposed behind the first display  100 . The second display  200  may be covered by the first display  100  and then may be exposed beyond the first display  100  by moving to the outside of the first display  100  according to user operation. Accordingly, the entire display area defined by the first and second displays  100  and  200  may be extended. 
     The first display  100  may include a first side  110  disposed along with the first direction D 1  and a second side  120  disposed along with the second direction D 2  perpendicular to the first direction D 1 . 
     The first display  100  may have an approximately rectangular shape. The first side  110  may be a left side of the first display  100 , and the second side  120  may be a lower side of the first display  100 . 
     The second display  200  may be disposed behind the first display  100 , and may include a main region  230 , a first region  210  extending from the main region  230  toward the first side  110 , and a second region  220  extending from the main region  230  toward the second side  120 . 
     The first region  210 , the second region  220 , and the main region  230  may each have an approximately rectangular shape, and all may have the same thickness, and may be integrally formed. The first region  210  may protrude from the left side of the main region  230  toward the first side  110  of the first display  100 . The second region  220  may protrude from a lower side of the main region  230  toward the second side  120  of the first display  100 . 
     As shown in  FIG. 3 , the second display  200  may have an overall “L” shape. 
     The first roller  300  may move along the first direction D 1  to wind or unwind the first region  210 . The second roller  400  may wind or unwind the second region  220 , and may move along the second direction D 2 . 
     The first and second rollers  300  and  400  may be disposed in a rear side of the first display  100  and be disposed perpendicular with each other. 
     The first roller  300  may be arranged adjacent to the first side  110  along the first direction D 1 , and the second roller  400  may be arranged adjacent to the second side  120  along the second direction D 2 . 
     The first roller  300  may have a first rotating axis  301  in line with the first direction D 1 , and the second roller  400  may have a second rotating axis  401  in line with the second direction D 2 . 
     The first roller  300  may rotate along the first rotating axis  301  to move the first region  210  along the second direction D 2 . The second roller  400  may rotate along the second rotating axis  401  to move the second region  220  along the first direction D 1 . 
     The first roller  300  may move along the first direction D 1  in association with the rolling operation of the second roller  400 . The second roller  400  may move along the second direction D 2  in association with the rolling operation of the first roller  300 . 
     The second display  200  may move along the first direction D 1  and/or the second direction D 2  so that the entire display area defined by the first and second displays  100  and  200  may be extended in multiple directions. 
     The second display  200  may move along a diagonal direction, which is the vector sum of the first direction D 1  and the second direction D 2 , so that the entire display area defined by the first and second displays  100  and  200  may be extended in the diagonal direction. 
       FIG. 4  are views illustrating the operation in which the second display extends along the first direction.  FIG. 5  are views illustrating the operation in which the second display extends along the second direction. And  FIG. 6  are views illustrating the operation of the second display extending along a diagonal direction. 
     Referring to  FIG. 4 , when the user pulls the second display  200  in the first direction D 1 , the first roller  300  may move or extent in the first direction D 1 , and the second roller  400  may rotate with respect to the second rotating axis  401  so that the second region  220  of the second display  200  may be unwound. 
     The second display  200  may move along the first direction D 1 , and may be exposed beyond the first display  100 . The display area defined by the first and second displays  100  and  200  may be longer in the vertical direction, as compared to the first display  100  alone. 
     Referring to  FIG. 5 , when the user pulls the second display  200  in the second direction D 2 , the second roller  400  may move or extend in the second direction D 2 , and the first roller  300  may rotate around the first rotating axis  301  so that the first region  210  of the second display  200  that has been wound is unwound. 
     The second display  200  may be exposed beyond the first display  100  by moving along the second direction D 2 . The display area defined by the first and second displays  100  and  200  may be longer in the horizontal direction, as compared to the first display  100  alone. 
     Referring to  FIG. 6 , if the user pulls the second display  200  in the third direction D 3 , which is the diagonal direction of the first display  100 , the first roller  300  may rotate about the first rotating axis  301  so that the first region  210  of the second display  200  is unwound while moving or extending in the first direction D 1 , and the second roller  400  may rotate about the second rotating axis  401  so that the second region  220  of the second display  200  is unwound while moving or extending in the second direction D 2 . 
     Accordingly, the second display  200  may be exposed beyond the first display  100  by moving along the third direction D 3 , which is the vector sum of the first and second directions D 1  and D 2 . The display area defined by the first and second displays  100  and  200  may be extended diagonally. 
     As such, the electronic apparatus  1  according to one embodiment of this disclosure may extend the display area diagonally, as well as horizontally and vertically. 
     The electronic apparatus  1  according to one embodiment of this disclosure may have its display area extended passively by the pulling force of the user as described above, but the embodiments disclosed herein are not limited thereto, and the display area may be actively or automatically extended by the driving device of a motor, for example. The automatic extension mechanism will be described in detail with reference to  FIG. 7 . 
       FIG. 7  is a block diagram illustrating an electronic apparatus according to one embodiment of the disclosure.  FIG. 8  is a flowchart illustrating a control process of the electronic apparatus according to one embodiment of the disclosure. 
     Referring to  FIGS. 7 and 8 , the electronic apparatus according to one embodiment of the disclosure may further include a first driving device  500 , a second driving device  600 , a sensor  700  and a processor  800 . 
     The first driving device  500  may linearly move the first and second rollers  300  and  400  in first and second directions (D 1  and D 2 ), respectively. 
     The first driving device  500  may include a first motor  501  moving the first roller  300  along the first direction D 1  and a second motor  502  moving the second roller  400  along the second direction D 2 . 
     The second driving device  600  may rotate the first and second rollers  300  and  400 . The second driving device  600  may include a third motor  601  for rotating the first roller  300  and a fourth motor  602  for rotating the second roller  400 . 
     The sensor  700  may detect the direction of the force of the user pulling the second display  200 . The sensor  700  may be placed on the second display  200 , but the position of the sensor  700  is not limited thereto. For example, the sensor  700  may be placed in at least one of the second to fourth frames  20 ,  30 ,  40  to be described later. 
     The processor  800  may control the first and second driving devices  500 ,  600  so that the second display  200  moves to a preset position, based on the direction of force detected by the sensor  700 . The processor  800  may include a microprocessor or any suitable type of processing circuitry, such as one or more general-purpose processors (e.g., ARM-based processors), a Digital Signal Processor (DSP), a Programmable Logic Device (PLD), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), a Graphical Processing Unit (GPU), a video card controller, etc. In addition, it would be recognized that when a general purpose computer accesses code for implementing the processing shown herein, the execution of the code transforms the general purpose computer into a special purpose computer for executing the processing shown herein. Certain of the functions and steps provided in the Figures may be implemented in hardware, software or a combination of both and may be performed in whole or in part within the programmed instructions of a computer. In addition, an artisan understands and appreciates that a “processor” or “microprocessor” may be hardware in the claimed disclosure. 
     The processor  800  may control the first and third motors  501  and  601  so as to unwind the first region  210  in the second direction D 2  while the first roller  300  moves in the first direction D 1 , if the direction of the force sensed by the sensor  700  is the diagonal direction of the first display  100 , and may control the second and fourth motors  502  and  602  so as to unwind the second region in the first direction D 1  while the second roller  400  moves in the second direction D 2 . 
     The first roller  300  may move or extent in the first direction D 1  by the first motor  501  and rotate to unwind the first region  210  in the second direction D 2  by the third motor  601 . At the same time, the second roller  400  may rotate to unwind the second region  220  in the first direction D 1  by the fourth motor  602  while moving in the second direction D 2  by the second motor  502 . 
     The speed of movement of the first roller  300  in the first direction D 1  by the first motor  501  may be the same as the linear speed in the first direction D 1  of the second region  220  by the fourth motor  602 . The speed of movement of the second roller  400  in the second direction D 2  by the second motor  502  may be the same as the linear speed in the second direction D 2  of the first region  210  by the third motor  601 . 
     The linear movement and rotation of the first and second rollers  300  and  400  are interlocked with each other, so that the second display  200  may be stably extended in the diagonal direction. 
     The processor  800  may control the first motor  501  to move the first roller  300  in the first direction D 1  when the direction of the force sensed by the sensor  700  is not a diagonal direction but the first direction D 1 , and control the fourth motor  602  such that the second roller  400  unwinds the second region  220  in the first direction D 1 . 
     The first roller  300  may move in the first direction D 1  by the first motor  501 , and the second roller  400  may rotate to unwind the second region  220  in the first direction D 1  by the fourth motor  602 . 
     The speed of movement of the first roller  300  in the first direction D 1  by the first motor  501  may be the same as the linear speed in the first direction D 1  of the second region  220  by the fourth motor  602 . The linear movement of the first roller  300  and the rotation of the second roller  400  are interlocked with each other, so that the second display  200  may be stably extended in the first direction D 1 . 
     The processor  800  may control the second motor  502  to move the second roller  400  in the second direction D 2  when the direction of the force sensed by the sensor  700  is not the diagonal direction but the second direction D 2 , and may control the third motor  601  so that the first roller  300  unwinds the first region  210  in the second direction D 2 . 
     The second roller  400  may move in the second direction D 2  by the second motor  502 , and at the same time the first roller  300  may rotate to unwind the first region  210  by the third motor  601  in the second direction D 2 . 
     The moving speed of the second roller  400  in the second direction D 2  by the second motor  502  may be the same as the linear speed of the second roller  400  in the second direction D 2  of the first region  210  by the third motor  601 . The linear movement of the second roller  400  and the rotation of the first roller  300  may be interlocked with each other, so that the second display  200  may be stably extended in the second direction D 2 . 
     As shown in  FIG. 8 , in operation S 810 , the electronic apparatus may detect the direction in which the second display  200  is being pulled by the user. In operation S 820 , a determination is made as to whether the direction is diagonal. If so, in operation S 830 , the first roller  300  may move or extent in the first direction D 1  by the first motor  501  and rotate to unwind the first region  210  in the second direction D 2  by the third motor  601 . At the same time, the second roller  400  may rotate to unwind the second region  220  in the first direction D 1  by the fourth motor  602  while moving in the second direction D 2  by the second motor  502 . If the direction is not diagonal in operation S 820 , then in operation S 840  a determination is made as to whether the pulling direction is the first direction D 1 . If so, in operation S 850  the processor  800  may control the first motor  501  to move the first roller  300  in the first direction D 1  and control the fourth motor  602  such that the second roller  400  unwinds the second region  220  in the first direction D 1 . If not, in operation S 860  the processor  800  may control the second motor  502  to move the second roller  400  in the second direction D 2 , and may control the third motor  601  so that the first roller  300  unwinds the first region  210  in the second direction D 2 . 
       FIG. 9  is an exploded perspective view of a plurality of frames according to one embodiment of the disclosure.  FIG. 10  is a view illustrating the placement of a plurality of frames according to the extension direction of the second display. 
     Referring to  FIGS. 9 and 10 , the electronic apparatus according to an embodiment of the disclosure may further include a first frame  10 , a second frame  20 , a third frame  30 , and a fourth frame  40 . The first to fourth frames  10 ,  20 ,  30 , and  40  may each have an “L” shape. The first to fourth frames  10 ,  20 ,  30 , and  40  may each be a rigid body. 
     The first frame  10  may support the first and second sides  110  and  120  of the first display  100 . The first frame  10  may surround the first and second sides  110  and  120  of the first display  100  and may be integrally formed with the first display  100 . 
     The first frame  10  may include a first vertical area  11  supporting the first side  110  and a first horizontal area  12  supporting the second side  120 . 
     The first vertical area  11  may be disposed in parallel with the first direction D 1 , and the first horizontal area  12  may be disposed in parallel with the second direction D 2 . The first vertical area  11  may have a length corresponding to the first side surface  110 , and the first horizontal area  12  may have a length corresponding to the second side surface  120 . 
     The second frame  20  may slide in the first direction D 1  with respect to the first frame  10 . The second frame  20  may include a second vertical area  21  slidable in the first direction D 1  with respect to the first vertical area  11 , and a second horizontal area  22  disposed perpendicular to the second vertical area  21 . The second vertical area  21  may cover the left side of the second display  200 , and the second horizontal area  22  may cover the upper surface of the second display  200 . 
     The upper end of the first roller  300  may be rotatably connected to the second horizontal area  22 . Accordingly, when the second display  200  extends in the first direction D 1 , the first roller  300  and the second horizontal area  22  may move together in the first direction D 1 . 
     The second vertical area  21  may be disposed in parallel with the first direction D 1 , and the second horizontal area  22  may be disposed in parallel with the second direction D 2 . The second vertical area  21  may be overlapped with the first vertical area  11  and may be moved in the first direction D 1  with respect to the first vertical area  11 . The second horizontal area  22  may have a length corresponding to the first horizontal area  12 . 
     The third frame  30  may slide in the second direction D 2  with respect to the first frame  10 . The third frame  30  may include a third horizontal area  32  that can slide in the second direction D 2  with respect to the first horizontal area  12 , and a third vertical area  31  disposed perpendicular to the third horizontal area  32 . The third vertical area  31  may cover the right side of the second display  200 , and the third horizontal area  32  may cover the lower side of the second display  200 . 
     The right end of the second roller  400  may be rotatably connected to the third vertical area  31 . Accordingly, when the second display  200  extends in the second direction D 2 , the second roller  400  and the third vertical area  31  may move together in the second direction D 2 . 
     The third vertical area  31  may be disposed in parallel with the first direction D 1 , and the third horizontal area  32  may be disposed in parallel with the second direction D 2 . The third horizontal area  32  may overlap the first horizontal area  12  and movement in the first direction D 1  may be restricted by the first horizontal area  12 . The third vertical area  31  may have a length corresponding to the first vertical area  11 . 
     The fourth frame  40  may slide in the second direction D 2  with respect to the second frame  20 , and may slid in the first direction D 1  with respect to the third frame  30 . 
     The fourth frame  40  may include a fourth horizontal area  42  slidable in the second direction D 2  with respect to the second horizontal area  22  and a fourth vertical area  41  slidable in the first direction D 1  with respect to the third vertical area  31 . The fourth vertical area  41  may cover the right side of the second display  200 , and the fourth horizontal area  42  may cover the upper side of the second display  200 . 
     The fourth vertical area  41  may be disposed in parallel with the first direction D 1 , and the fourth horizontal area  42  may be disposed in parallel with the second direction D 2 . The fourth horizontal area  42  may be partially overlapped with the second horizontal area  22  and movement in the first direction D 1  may be restricted by the second horizontal area  22 . The fourth vertical area  41  may be partially overlapped with the third vertical area  31  and movement in the second direction D 2  may be restricted by the third vertical area  31 . 
     When the second display is extended in the first direction D 1 , the second frame  20  may slide in the first direction D 1  with respect to the first frame  10 , and the fourth frame  40  may slide in the first direction D 1  with respect to the third frame  30 . 
     When the second display is extended in the first direction D 1 , the second vertical area  21  may slide in the first direction D 1  with respect to the first vertical area  11 , and the fourth vertical area  41  may slide in the first direction D 1  with respect to the third vertical area  31 . 
     When the second display is extended in the second direction D 2 , the third frame  30  may slide in the second direction D 2  with respect to the first frame  10 , and the fourth frame  40  may slide in the second direction D 2  with respect to the second frame  20 . 
     When the second display is extended in the second direction D 2 , the third horizontal area  32  may slide in the second direction D 2  with respect to the first horizontal area  12 , and the fourth horizontal area  42  may slide in the second direction D 2  with respect to the second horizontal area  22 . 
     When the second display is extended in the third direction D 3 , the second frame  20  may slide in the first direction D 1  with respect to the first frame  10 , and the third frame  30  may slide in the second direction D 2  with respect to the first frame  10 . At the same time, the fourth frame  40  may slide in the first direction D 1  with respect to the third frame  30  and slid in the second direction D 2  with respect to the second frame  20 . 
     When the second display is extended in the first direction D 1 , the second vertical area  21  may slide in the first direction D 1  with respect to the first vertical area  11 , and the fourth vertical area  41  overlapping the second horizontal area  22  may slide in the first direction D 1  with respect to the third vertical area  31 . 
     Since the second display  200  is extended in any one of the first to third directions D 1 , D 2 , and D 3 , and at the same time, the first to fourth frames  10 ,  20 ,  30 , and  40  are extended in association with the above-described process, the side surfaces of the second display  200  may be stably covered by the first to fourth frames  10 ,  20 ,  30 , and  40  to be protected from the outside. 
       FIG. 11  is a side view illustrating the process by which the auxiliary roller guides the direction of movement of the second display. And  FIG. 12  is a side view illustrating the process by which the second display extends in a state where one end of the second display is connected to a support member wounded around a guide roller. 
     Referring to  FIG. 11 , the electronic apparatus according to an embodiment of the disclosure may include a first auxiliary roller  900   a  and a second auxiliary roller  900   b . The first auxiliary roller  900   a  may be disposed in line with the first roller  300  between the first roller  300  and the first display  100 . The second auxiliary roller  900   b  may be disposed in line with the second roller  400  between the second roller  400  and the first display  100 . The first and second auxiliary rollers  900   a  and  900   b  may be disposed adjacent to the rear surface of the first display  100 . 
     The first auxiliary roller  900   a  may guide the moving path of the first region  210  of the second display  200 , and the second auxiliary roller  900   b  may guide the moving path of the second region  220  of the second display  200 . 
     The first region  210  may be unwound from the first roller  300  while being in contact with the outer surface of the first auxiliary roller  900   a  to move in a direction parallel to the first display  100 . Similarly, the second region  220  may be unwound from the second roller  400  while being in contact with the outer surface of the second auxiliary roller  900   b  to move in a direction parallel to the first display  100 . 
     Accordingly, the second display  200  may be guided to move in a direction parallel to the first display  100  by the first and second auxiliary rollers  900   a  and  900   b , regardless of the amount of winding around the first and second rollers  300  and  400 . 
     Referring to  FIG. 12 , the electronic apparatus according to an embodiment may further include a first guide roller  1000   a  and a second guide roller  1000   b  disposed in parallel with the first and second rollers  300  and  400 , respectively. The electronic apparatus according to an embodiment may also include a first supporting member  1100   a  and a second supporting member  1100   b  of which one end is connected to one end of the first and second regions  210  and  220 , respectively, and other end is wound around the first and second guide rollers  1000   a  and  1000   b,  respectively. 
     The first and second support members  1100   a  and  1100   b  may have the same width as the first and second regions  210  and  220 , respectively. The first and second support members  1100   a  and  1100   b  may be made of fabric or plastic, but the material is not limited thereto. 
     A part of the first region  210  may be disposed in parallel with the first display  100  between the first roller  300  and the first guide roller  1000   a,  and a part of the second region  220  is disposed in parallel with the first display  100  between the second roller  400  and the second guide roller  1000   b.    
     Not all of the first and second regions  210  and  220  of the second display  200  are wound around the first and second rollers  300  and  400 , and only a very small area of the second display  200  is wound around the first and second rollers  300  and  400  and bent, so that the second display  200  may not be damaged due to excessive bending stress while expanding and contracting, and may stably move. 
     While the preferred embodiment of this disclosure has been shown and described, the disclosure is not limited to the specific embodiment described above, and it is apparent that various modifications can be made by those having ordinary skill in the technical field to which the disclosure belongs, without departing from the gist of the disclosure as claimed by the appended claims, and such modifications shall be within the scope of the claims range. 
     Certain of the above-described embodiments of the present disclosure can be implemented in hardware, firmware or via the execution of software or computer code that can be stored in a recording medium such as a CD ROM, a Digital Versatile Disc (DVD), a magnetic tape, a RAM, a floppy disk, a hard disk, or a magneto-optical disk or computer code downloaded over a network originally stored on a remote recording medium or a non-transitory machine readable medium and to be stored on a local recording medium, so that the methods described herein can be rendered via such software that is stored on the recording medium using a general purpose computer, or a special processor or in programmable or dedicated hardware, such as an ASIC or FPGA. As would be understood in the art, the computer, the processor, microprocessor controller or the programmable hardware include memory components, e.g., RAM, ROM, Flash, etc. that may store or receive software or computer code that when accessed and executed by the computer, processor or hardware implement the processing methods described herein.