Patent Publication Number: US-11656022-B2

Title: Refrigerator

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/726,102 filed on Dec. 23, 2019, which is a continuation of U.S. patent application Ser. No. 15/857,408 filed on Dec. 28, 2017, which is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2017-0000956 filed on Jan. 3, 2017, Korean Patent Application No. 10-2017-0111502 filed on Aug. 31, 2017, and U.S. Provisional Patent Application No. 62/524,882 filed on Jun. 26, 2017, the disclosures of which are herein incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     Embodiments of the present disclosure relate to a refrigerator, and more particularly, to a refrigerator with an improved door structure. 
     BACKGROUND 
     Generally, a refrigerator is a home appliance capable of freshly storing foods by providing a storage compartment configured to store the foods and a cold air supply device configured to supply cold air to the storage compartment. 
     A refrigerator may be classified according to the type of storage compartment and type of door. 
     There are top mounted freezer (TMP) type refrigerators in which a storage compartment is divided into an upper portion and a lower portion by a horizontal partition wall to form a freezing compartment at an upper side of the storage compartment and a refrigerating compartment at a lower side thereof, and a bottom mounted freezer (BMF) type refrigerator in which a storage compartment is divided into an upper portion and a lower portion by a horizontal partition wall to form a refrigerating compartment at an upper side of the storage compartment and a freezing compartment at a lower side thereof. 
     In addition, there are a side-by-side (SBS) type refrigerator in which a storage compartment is divided into left and right sides by a vertical partition wall to form a freezing compartment at one of the left and right sides and a refrigerating compartment chamber at the other side thereof and a French door type refrigerator (FDR) in which a storage compartment is divided into an upper portion and a lower portion by a horizontal partition to form a refrigerating compartment at an upper side of the storage compartment and a freezing compartment at a lower side thereof, wherein the refrigerating compartment at the upper side is opened and closed by a pair of doors. 
     Lately, various electronic devices are being added to refrigerators to supplement and improve functions of the refrigerator in addition to original functions thereof. However, as various devices are added to a refrigerator, problems with efficiently disposing each of the various devices in the refrigerator and electrically connecting these devices to a controller or a power supply occur. 
     SUMMARY 
     To address the above-discussed deficiencies, it is a primary object to provide a refrigerator having an improved arrangement of electronic devices and improved connections between these electronic devices and the refrigerator. 
     Also, it is another aspect of the present disclosure to provide a refrigerator in which electric wires are minimally exposed. 
     Further, it is still another aspect of the present disclosure to provide a refrigerator having a display device. 
     Furthermore, it is yet another aspect of the present disclosure to provide a refrigerator in which an arrangement of electric components is improved. 
     Additional aspects of the disclosure will be set forth in part in the description that follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure. 
     In accordance with one aspect of the present disclosure, a refrigerator includes a main body having a storage compartment; an inner door rotatably provided at the main body; and an outer door configured to open and close the storage compartment together with the inner door and rotatably provided at the inner door, wherein the inner door includes a connector seating portion disposed at an upper portion of the inner door and configured to connect a first electric wire, which is separably connected to a main body electric wire of the main body and disposed to pass through the inner door, to a second electric wire extending from the outer door to the inner door. 
     The inner door and the outer door may move between an open state for opening the storage compartment, a closed state for sealing the storage compartment, and a partially open state in which the outer door is opened from the inner door, and, when the inner door and the outer door move between the open state, the closed state, and the partially open state, lengths of the first and second electric wires from the main body and the outer door to the connector seating portion may be kept constant. 
     The connector seating portion may form a seating space in which a first connector of the first electric wire and a second connector of the second electric wire are separably coupled. 
     The outer door may be provided such that the first and second connectors separate from each other in the connector seating portion such that the outer door becomes electrically disconnected from the inner door. 
     The inner door may further include a hinge assembly connected to the connector seating portion and configured to form a center of rotation of the outer door. 
     The hinge assembly may guide the second electric wire from the center of rotation of the outer door to the connector seating portion. 
     The hinge assembly may form a guide space from the center of rotation of the outer door to the connector seating portion so as to prevent the second electric wire from being exposed to the outside. 
     The hinge assembly may be configured to space apart the center of rotation of the outer door from the inner door. 
     The outer door may include an assembly insertion portion formed at a surface facing the inner door and provided to allow the hinge assembly to be inserted thereinto so as not to interfere with a rotation of the inner door. 
     The first electric wire may be disconnected from either the main body electric wire or the second electric wire such that the inner door or the outer door may be configured to be selectively separable. 
     The outer door may be provided to be separable from the inner door together with the second electric wire, and the inner door may be provided to be separable from the main body together with the first electric wire. 
     The outer door may further include a display device provided at a front surface thereof and configured to be able to output an image, and the second electric wire may be coupled to the display device. 
     The outer door may be provided to cover a front surface of the inner door. 
     In accordance with another aspect of the present disclosure, a refrigerator includes a main body having a storage compartment; an inner door rotatably installed at the main body and having an inner electric wire connected to a main body electric wire of the main body and configured to pass through the inner door; and an outer door connected to an electric device of the outer door having an outer electric wire provided to be separable from the inner electric wire and rotatably provided at the inner door, wherein the inner electric wire disconnects from either the main body electric wire or the outer electric wire such that the inner door or the outer door is configured to be selectively separable. 
     The outer door may be provided to be separable from the inner door together with the outer electric wire, and the inner door may be provided to be separable from the main body together with the inner electric wire. 
     The refrigerator may further include a connector seating portion formed at an upper portion of the inner door to form a space in which a first connector of the outer electric wire and a second connector of the inner electric wire are coupled. 
     The inner door and the outer door may move between an open state for opening the storage compartment, a closed state for sealing the storage compartment, and a partially open state in which the outer door is opened from the inner door, and, when the inner door and the outer door move between the open state, the closed state, and the partially open state, lengths of the inner and outer electric wires from the main body and the outer door to the connector seating portion may be kept constant. 
     The connector seating portion may form a seating space in which a first connector of the inner electric wire and a second connector of the outer electric wire are separably coupled. 
     The outer door may be provided such that the first and second connectors separate from each other in the connector seating portion such that the outer door becomes electrically disconnected from the inner door. 
     The outer door may further include a hinge assembly having a guide space extending from a center of rotation of the outer door to the connector seating portion so as to prevent the outer electric wire from being exposed to the outside, connected to the connector seating portion, and configured to form the center of rotation of the outer door. 
     Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like. 
     Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: 
         FIG.  1    is a perspective view of a refrigerator according to one embodiment of the present disclosure; 
         FIG.  2    is a perspective view illustrating a state in which a door of the refrigerator according to one embodiment of the present disclosure is opened; 
         FIG.  3    is an exploded view of some components of the refrigerator according to one embodiment of the present disclosure; 
         FIG.  4    is an exploded view of a door of the refrigerator according to one embodiment of the present disclosure; 
         FIG.  5    is a diagram illustrating a coupling between doors of the refrigerator according to one embodiment of the present disclosure; 
         FIG.  6    is an exploded perspective view illustrating the coupling between the doors of the refrigerator according to one embodiment of the present disclosure; 
         FIG.  7    is a diagram illustrating an arrangement of electric wires inside an inner door of the refrigerator according to one embodiment of the present disclosure; 
         FIGS.  8 ,  9 , and  10    are diagrams illustrating operations of the refrigerator according to one embodiment of the present disclosure; 
         FIG.  11    is a perspective view of a door of a refrigerator according to another embodiment of the present disclosure; 
         FIG.  12    is an exploded perspective view illustrating some components of the door of the refrigerator according to another embodiment of the present disclosure; 
         FIG.  13    is a diagram of the door of the refrigerator according to another embodiment of the present disclosure when viewed from an upper side of the door; 
         FIG.  14    is an exploded perspective view illustrating some components of the door of the refrigerator according to another embodiment of the present disclosure; 
         FIG.  15    is a cross-sectional view of a door of a refrigerator according to still another embodiment of the present disclosure; 
         FIG.  16    is a perspective view of some components of the door of the refrigerator according to still another embodiment of the present disclosure; 
         FIG.  17    is an enlarged view of a portion A in  FIG.  16   ; 
         FIG.  18    is a partial cross-sectional view of the door of the refrigerator according to still another embodiment of the present disclosure; 
         FIG.  19    is a perspective view of the refrigerator according to yet another embodiment of the present disclosure; 
         FIG.  20    is a perspective view illustrating a state in which the door of the refrigerator according to yet another embodiment of the present disclosure is opened; 
         FIGS.  21  and  22    are exploded views of some components of the refrigerator according to yet another embodiment of the present disclosure; 
         FIG.  23    is a diagram illustrating an arrangement of electric wires inside an inner door of the refrigerator according to yet another embodiment of the present disclosure; 
         FIG.  24    is an enlarged view of a portion A in  FIG.  21   ; 
         FIG.  25    is an enlarged view of a portion B in  FIG.  21   ; 
         FIG.  26    is an enlarged view of a connector seating portion and an electric wire guide of the refrigerator according to yet another embodiment of the present disclosure; 
         FIG.  27    is an exploded perspective view of some components of the refrigerator according to yet another embodiment of the present disclosure; and 
         FIGS.  28 ,  29 , and  30    are diagrams illustrating operations of the refrigerator according to yet another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIGS.  1  through  30   , discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device. 
     Embodiments described herein and configurations shown in the accompanying drawings are merely preferred examples of the present disclosure, and various modified examples that may replace the embodiments and the accompanying drawings of the present disclosure may be made at the time at which the present application is filed. 
     Further, like reference numerals or symbols given in the various drawings of the present specification indicate parts or components that perform substantially the same functions. 
     Also, the terms used herein are used to describe the embodiments and are not intended to restrict and/or limit the present disclosure. Unless the context clearly dictates otherwise, the singular form includes the plural form. In this description, the terms “comprising,” “having,” or the like are used to specify that a feature, a number, a step, an operation, a component, an element, or a combination thereof described herein exists, and they do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or combinations thereof. 
     Further, it should be understood that terms including ordinals such as “a first,” “a second,” and the like may be used herein to describe various components, but the components are not limited to the terms, and these are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items and any one item of the plurality of related listed items. 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. 
       FIG.  1    is a perspective view of a refrigerator according to one embodiment of the present disclosure, and  FIG.  2    is a perspective view illustrating a state in which a door of the refrigerator according to one embodiment of the present disclosure is opened. 
     A refrigerator  1  includes a main body  10 , a storage compartment  20  formed inside the main body  10  and comparted into upper and lower portions, a door  30  configured to open and close the storage compartment  20 , and a cold air supply device (not shown) configured to supply cold air to the storage compartment  20 . 
     The main body  10  may include an inner case  12  configured to form the storage compartment  20 , an outer case  14  connected to the outside of the inner case  12  to form an exterior of the main body  10 , and insulation (not shown) to be foamed between the inner case  12  and the outer case  14  to insulate the storage compartment  20 . 
     A main body cover  76  may be provided at an upper portion of the main body  10  to prevent a configuration of a power supply unit, a control unit, or the like, which is not shown, from being exposed to the outside. 
     The cold air supply device may generate cold air using a cooling cycle that compresses, condenses, expands, and evaporates a refrigerant. 
     A front surface of the storage compartment  20  may be provided to be open, and the storage compartment  20  may be comparted into a refrigerating compartment  22  at an upper side thereof and a freezing compartment (not shown) at a lower side thereof by a horizontal partition wall  25 . The refrigerating compartment  22  may be opened and closed by a pair of doors  30  and  40  rotatably coupled to the main body  10 , and the freezing compartment may also be opened and closed by a pair of doors  50  rotatably coupled to the main body. The shapes of the doors  30 ,  40 , and  50  are not limited, and a sliding door configured to slide to open and close may be applied thereto. 
     The pair of doors  30  and  40  configured to open and close the refrigerating compartment  22  may be laterally disposed thereat. For convenience in the following description, the door  30  disposed at a right side in the drawing is referred to as a first door  30 , and the door  40  disposed at a left side therein is referred to as a second door  40 . For convenience of description, in a relationship between the first and second doors  30  and  40  of the refrigerating compartment  22  and the doors  50  of the freezing compartment, the first and second doors  30  and  40  of the refrigerating compartment  22  are referred to as upper doors  30  and  40 , and the doors  50  of the freezing compartment are referred to as a lower door  50 . A first door handle  38  is grippably provided at the first door  30  to open and close the first door  30 , and a second door handle  48  is grippably provided at the second door  40  to open and close the second door  40 . Further, a lower door handle  58  is grippably provided at the lower door  50  to open and close the lower door  50 . 
     The first door  30  may open and close a right side portion of the refrigerating compartment  22 , and the second door  40  may open and close the remaining portion of the refrigerating compartment  22 . A door shelf  35  may be provided at a rear surface of each of the first door  30  and the second door  40  to receive foods. 
     The door shelf  35  may include a shelf supporter  35   a  extending vertically from the first and second doors  30  and  40  to support the door shelf  35  at left and right sides thereof. The shelf supporter  35   a  may be separably provided at each of the doors  30 ,  40 , and  50  as a separate configuration, and, in this embodiment, the shelf supporter  35   a  is provided to be formed to extend from each of the doors  30 ,  40 , and  50 . 
     Further, a gasket  36  may be provided at an edge of the rear surface of each of the first door  30  and the second door  40  to seal a gap between the main body  10  and the first and second doors  30  and  40  in a state in which the first and second doors  30  and  40  are closed. 
     The gasket  36  may be installed in a form of a loop along the edge of the rear surface of each of the first door  30  and the second door  40 , and a magnet (not shown) may be include inside the gasket  36 . 
     Meanwhile, in a state in which the first door  30  and the second door  40  are closed, a gap may occur between the first door  30  and the second door  40 , and thus a bar assembly (not shown) may be provided to seal the gap. 
       FIG.  3    is an exploded view of some components of the refrigerator according to one embodiment of the present disclosure, and  FIG.  4    is an exploded view of a door of the refrigerator according to one embodiment of the present disclosure. 
     The first door  30  may include a first inner door  31  and a first outer door  32 . In the present embodiment, the second door  40  is shown to be formed as a single door, but the present disclosure is not limited thereto, and, like the first door  30 , the second door  40  may be configured to be divided into a second inner door and a second outer door. 
     The first door  30  may include the first inner door  31  rotatably provided at the main body  10 , and the first outer door  32  rotatably provided at the first inner door  31 . The first outer door  32  may be configured to cover a front surface of the first inner door  31 . The door shelf  35 , the shelf supporter  35   a , and the gasket  36 , which are described above, may be formed at the first inner door  31 . Each of an outer case  31   a  and an inner case  31   b  of the first inner door  31  may have a quadrangular frame shape, and may include a door opening  33  having an open interior. The first outer door  32  may be configured to cover the door opening  33  of the first inner door  31 . 
     More specifically, the first outer door  32  may include a protruding door surface  39  formed on a surface of the first outer door  32  facing the first inner door  31  to protrude toward a rear side of the first outer door  32 . The protruding door surface  39  is configured to correspond to the door opening  33  of the first inner door  31 , and, when the first outer door  32  is placed at a position closing the first inner door  31 , the protruding door surface  39  is configured to cover the door opening  33 . The protruding door surface  39  may protrude toward the rear side of the first outer door  32  therefrom to allow the insulation to be easily disposed inside the first outer door  32 . That is, a thickness of the first outer door  32  at a portion at which the protruding door surface  39  is disposed inside the first outer door  32  may be thicker than that of an adjacent portion thereof such that insulation performance of the first outer door  32  can be enhanced. 
     For convenience of the following description of the present embodiment, the first inner door  31  is referred to as an inner door  31 , and the first outer door  32  is referred to as an outer door  32 . Further, the following description will be made with respect to the first door  30 , but the present disclosure is not limited thereto, and the following description may also be applied to the second door  40 . For convenience of the following description of the present embodiment, the first door  30  is referred to as a door  30 . 
     The refrigerator  1  may include a display device  60  having an input and output function. For convenience of a user, the display device  60  may be installed at the front surface of the door  30 . A display installation portion  34  may be formed to be recessed at the front surface of the door  30  to allow the display device  60  to be installed thereon. Since the display device  60  is formed in a substantially quadrangular shape, the display installation portion  34  may also be formed in a quadrangular shape. 
       FIG.  5    is a diagram illustrating a coupling between doors of the refrigerator according to one embodiment of the present disclosure,  FIG.  6    is an exploded perspective view illustrating the coupling between the doors of the refrigerator according to one embodiment of the present disclosure, and  FIG.  7    is a diagram illustrating an arrangement of electric wires inside an inner door of the refrigerator according to one embodiment of the present disclosure. 
     The refrigerator  1  may include an electric wire  62  connecting the door  30  to the main body  10  for an electronic device installed at the door  30 . The electric wire  62  may include a first electric wire  64  extending from a main body electric wire  77  of the main body  10  (See,  FIG.  2   ) to the inner door  31 , and a second electric wire  66  extending from the outer door  32  to the inner door  31 . The first electric wire  64  may be separably connected to the main body electric wire  77 , and may be provided to pass through the inner door  31 . The second electric wire  66  may be separably connected to the first electric wire  64 , and may extend from the outer door  32  to the inner door  31 . The first and second electric wires  64  and  66  may be referred to as an inner electric wire  64  and an outer electric wire  66 , respectively. The first and second electric wires  64  and  66  may include connectors  64   a  and  66   a  configured to mutually connect the first and second electric wires  64  and  66 . That is, the first and second electric wires  64  and  66  may include first and second connectors  64   a  and  66   a , respectively. 
     The door  30  may include a connector seating portion  37  to connect the first and second electric wires  64  and  66 . The first and second connectors  64   a  and  66   a  formed at ends of the first and second electric wires  64  and  66 , respectively, may be configured to connect to each other at the connector seating portion  37 . The connector seating portion  37  may be formed at an upper portion of the inner door  31  to form a seating space  37   a  at an upper surface of the inner door  31 . In the seating space  37   a , the first and second connectors  64   a  and  66   a  may be separably coupled to each other. The connector seating portion  37  may be formed to be recessed at the upper surface of the inner door  31 . In the present embodiment, the connector seating portion  37  is described to be disposed at the upper surface of the inner door  31 , but the present disclosure is not limited thereto, and the connector seating portion  37  may be disposed at an upper surface of the outer door  32 . When the connector seating portion  37  is disposed at the upper surface of the outer door  32 , the first electric wire  64  may be configured to be guided by a hinge assembly  80 , which will be described below, to reach the connector seating portion  37  provided at the outer door  32 . 
     The first electric wire  64  may be separably connected to the main body electric wire  77  of the main body  10 , and may be connected to a controller (not shown) or a power supply device (not shown) that is connected to the main body electric wire  77 . The first electric wire  64  may extend to the inner door  31  to be connected to the second electric wire  66 . 
     The second electric wire  66  may be configured to be connected to an electric device installed at the outer door  32 . For example, the second electric wire  66  may be connected to the display device  60  to transmit information between the display device  60  and the controller, or to supply power to the display device  60 . 
     As the first and second electric wires  64  and  66  are connected in the connector seating portion  37  provided at the inner door  31 , the outer door  32  may be easily separated from the inner door  31 . That is, when the outer door  32  is separated from the inner door  31 , the first and second connectors  64   a  and  66   a  of the first and second electric wires  64  and  66 , which are seated in the connector seating portion  37 , separate from each other such that an electrical connection may become disconnected or released and the outer door  32  may become physically separated from the inner door  31 . 
     For convenience of description, although each of the first and second electric wires  62  are described as a single electric wire, a plurality of first and second electric wires  62  may be formed and applied. 
     The main body electric wire  77  and the first and second electric wires  64  and  66  may be connected in series. That is, the main body electric wire  77 , the first electric wire  64 , and the second electric wire  66  may be provided to be sequentially connected. The outer door  32  is provided to be separable from the inner door  31  together with the second electric wire  66 , and the inner door  31  is provided to be separable from the main body  10  together with the first electric wire  64 . 
     By disconnecting the first electric wire  64  from either the main body electric wire  77  or the second electric wire  66 , the inner door  31  or the outer door  32  may be configured to be selectively separable. That is, by disconnecting the main body electric wire  77  from the first electric wire  64 , the inner door  31  is in a state of being separable from the main body  10 . Since the outer door  32  is coupled to the inner door  31 , both the inner door  31  and the outer door  32  are in a state of being separable from the main body  10  through the above-described process. Further, by disconnecting the second electric wire  66  from the first electric wire  64 , the outer door  32  is in a state of being separable from the inner door  31 . With such a configuration, when the door  30  is assembled to or separated from the main body  10 , assimilability of the refrigerator  1  may be improved. That is, when the door  30  is coupled to the main body  10 , the inner door  31  and the outer door  32  may be sequentially coupled to the main body  10 , or may be coupled to the main body  10  in a state in which the inner door  31  and the outer door  32  are coupled to each other. A separation of the door  30  from the main body  10  may be performed in an order opposite to that in which the door  30  is coupled to the main body  10 . 
     The refrigerator  1  may include a door hinge  70  (See,  FIG.  3   ). 
     The door hinge  70  may include a door hinge bracket  72 , and a hinge rotating shaft  74  formed at the door hinge bracket  72 . The door hinge bracket  72  is installed at the main body  10 , and the door  30  is configured to be rotated relative to the hinge rotating shaft  74 . More specifically, a hinge hole  31   c  corresponding to the hinge rotating shaft  74  may be formed at the inner door  31 , and the hinge rotating shaft  74  may be configured to be inserted into the hinge hole  31   c  of the inner door  31  to allow the inner door  31  to be rotated on the basis of the hinge rotating shaft  74 . The hinge rotating shaft  74  may be disposed to be spaced apart from the main body  10  to prevent interference therewith when the inner door  31  is rotated. 
     The door  30  may include the hinge assembly  80 . The hinge assembly  80  may be a component of the inner door  31 . The hinge assembly  80  may be connected to the connector seating portion  37 , and may be configured to form a center of rotation of the outer door  32 . The hinge assembly  80  may be configured to guide the second electric wire  66  from the center of rotation of the outer door  32  to the connector seating portion  37 . 
     The hinge assembly  80  may include a hinge bracket  82 . The hinge bracket  82  is provided at one door  30  of the inner door  31  and the outer door  32 , and is configured to allow the other door  30  to be rotatable. In the present embodiment, the hinge bracket  82  is installed at the inner door  31 , and the outer door  32  is configured to be rotated on the basis of a rotational shaft  83  formed at the hinge bracket  82 . However, the present disclosure is not limited to the described above, the hinge bracket  82  may be installed at the outer door  32 , and the rotational shaft  83  formed at the hinge bracket  82  may be configured to be coupled to the inner door  31  to allow the outer door  32  to be rotated relative to the inner door  31 . The hinge bracket  82  may be disposed adjacent to the connector seating portion  37 . 
     The hinge bracket  82  may include a hinge body  82   a  and the rotational shaft  83 . 
     The hinge body  82   a  is formed to be fixed at the inner door  31  and to protrude toward the outer door  32 . The hinge body  82   a  may be formed of a metal to support a weight of the outer door  32  and to stably support an operation of the outer door  32 . 
     The rotational shaft  83  may have a hollow portion  84  and may be provided at the hinge body  82   a  to allow the outer door  32  to be rotatable. The rotational shaft  83  may be configured to be inserted into a rotational hole  32   a  of the outer door  32  (See,  FIG.  3   ) to allow the outer door  32  to be rotated on the basis of the rotational shaft  83 . The rotational shaft  83  may be disposed to be spaced apart from the inner door  31  to prevent interference therewith when the outer door  32  is rotated. That is, the hinge assembly  80  may be configured such that the rotation center of the outer door  32  is spaced apart from the inner door  31 . 
     The outer door  32  may include an assembly insertion portion  89  formed at a surface facing the inner door  31 . Since the hinge assembly  80  is provided to protrude from the inner door  31 , the assembly insertion portion  89  is provided to allow the hinge assembly  80  to be inserted thereinto so the inner door  31  does not interfere with the rotation of the outer door  32 . 
     The second electric wire  66  may be configured to pass through the hollow portion  84  of the rotational shaft  83 . That is, it may be configured such that one side of the second electric wire  66  is connected to the display device  60 , and the other side thereof extends to pass through the hollow portion  84  of the rotational shaft  83 . Since the hinge bracket  82  is formed of a rigid body, a distance, an angle, and an arrangement between the rotational shaft  83  and the connector seating portion  37  may be kept constant even though the door  30  is being rotated. That is, even when the inner door  31  or the outer door  32  is being rotated, the distance, the angle, and the arrangement between the rotational shaft  83  and the connector seating portion  37  may be kept constant. With such a configuration, the second electric wire  66  passing through the hollow portion  84  of the rotational shaft  83  may extend to the connector seating portion  37  without being affected by a rotational movement of the door  30 . 
     The hinge assembly  80  may include a hinge cover  86 . 
     The hinge cover  86  may be configured to cover at least a portion of the hinge body  82   a  and cover the connector seating portion  37 . The hinge cover  86  may be configured such that one side of the hinge cover  86  is open to cover the hinge bracket  82  and the connector seating portion  37 . An interior of the hinge cover  86  may be recessed to form a guide space  87 . The hinge cover  86  may be configured to cover at least a portion of the rotational shaft  83 , cover the connector seating portion  37 , and form the guide space  87  extending from the rotational shaft  83  to the connector seating portion  37 . A shape of the guide space  87  formed inside the hinge assembly  80  is not limited to a particular shape, and the shape thereof may employ any configuration that prevents the second electric wire  66  from being exposed to the outside and guides the second electric wire  66  from the center of rotation of the outer door  32  to the connector seating portion  37 . 
     The second electric wire  66  may passes through the hollow portion  84  of the rotational shaft  83 , and may extend to the connector seating portion  37  through the guide space  87  formed by the hinge cover  86  and the hinge bracket  82 . That is, the hinge cover  86  may guide the second electric wire  66  from the hollow portion  84  to the connector seating portion  37 . 
     Referring to  FIG.  7   , the first electric wire  64  may be configured to extend from the main body  10  to pass through a hollow portion  74   a  formed in the hinge rotating shaft  74 . The first electric wire  64  may pass through the hollow portion  74   a  and a lower portion of the upper surface of the inner door  31  to extend to the connector seating portion  37 . The first electric wire  64  extending to the connector seating portion  37  may be connected to the second electric wire  66  extending to the connector seating portion  37 . 
     An operation of the refrigerator  1  according to the embodiment of the present disclosure will be described below. 
       FIGS.  8 ,  9 , and  10    are diagrams illustrating operations of the refrigerator  1  according to one embodiment of the present disclosure. 
       FIG.  8    illustrates a state in which both of the outer door  32  and the inner door  31  are closed,  FIG.  9    illustrates a state in which the outer door  32  is opened and the inner door  31  is closed, and  FIG.  10    illustrates a state in which the inner door  31  is opened with respect to the main body  10  and the outer door  32  is opened with respect to the inner door  31 . Although not shown in the drawing, both of the inner door  31  and the outer door  32  may operate in an open state with respect to the main body  10 . For convenience of description, a state of the door  30  in  FIG.  8    may be referred to as a closed state  30   a , a state of the door  30  in  FIG.  9    may be referred to as a partially open state  30   b , and a state of the door  30  in  FIG.  10    may be referred to as an open state  30   c . As shown in  FIG.  10   , in the open state  30   c  of the door  30 , the inner door  31  and the outer door  32  may be separated from each other, or they may operate together in an open state with respect to the main body  10 . 
     As shown in  FIG.  8   , in the closed state  30   a , the inner door  31  is rotatably provided at the main body  10  by the door hinge  70 , and the outer door  32  is rotatably provided at the inner door  31  by the hinge assembly  80 . 
     Descriptions will be made with reference to  FIG.  9   . In the partially open state  30   b , the outer door  32  is separated from the inner door  31  and is rotated on the basis of the rotational shaft  83  of the hinge assembly  80 . Since the hinge assembly  80  is installed at the inner door  31 , the hinge assembly  80  is fixed to the inner door  31  without moving even when the outer door  32  is rotated. 
     Descriptions will be made with reference to  FIG.  10   . In the open state  30   c , the outer door  32  is separated from the inner door  31  and is rotated on the basis of the rotational shaft  83  of the hinge assembly  80 , and the inner door  31  is separated from the main body  10  and is rotated on the basis of the hinge rotating shaft  74  of the door hinge  70 . As shown in  FIG.  9   , since the hinge assembly  80  is installed at the inner door  31 , even when the outer door  32  and the inner door  31  are rotated, the hinge assembly  80  is fixed to the inner door  31  without operation. With such a configuration, the distance, angle, and arrangement between the rotational shaft  83  of the hinge assembly  80  and the connector seating portion  37  may be kept constant even when the door  30  is being rotated, so that the second electric wire  66  extending from the rotational shaft  83  of the outer door  32  to the connector seating portion  37  may not be affected by the operation of the door  30 . Further, a length of each of the first and second electric wires  64  and  66  may be kept constant while the door  30  is moved between the open state  30   c , the closed state  30   a , and the partially open state  30   b . Furthermore, since the second electric wire  66  is connected to the first electric wire  64  without being affected by the operations of the outer door  32  and the inner door  31 , power may be stably supplied to electronic devices installed at the outer door  32 , and a signal transmission between the electronic devices and a controller may be smoothly performed. In addition, the second electric wire  66  is not affected by repetitive rotational operations of the door  30  such that durability of the second electric wire  66  can be improved. 
     A refrigerator according to another embodiment of the present disclosure will be described below. 
       FIG.  11    is a perspective view of a door of a refrigerator according to another embodiment of the present disclosure,  FIG.  12    is an exploded perspective view illustrating some components of the door of the refrigerator according to another embodiment of the present disclosure,  FIG.  13    is a diagram of the door of the refrigerator according to another embodiment of the present disclosure when viewed from an upper side of the door, and  FIG.  14    is an exploded perspective view illustrating some components of the door of the refrigerator according to another embodiment of the present disclosure. 
     A door  40  may include an installation portion  90 . 
     The installation portion  90  may be provided to be recessed at an upper portion of the door  40  to form an installation space  92  in which a printed circuit board  99  is installed. In the present embodiment, the door  40  provided with the installation portion  90  is described as the second door  40 , but the present disclosure is not limited thereto, and the installation portion  90  may be formed at the first door  30  at which the display device  60  is installed. For convenience of the following description of the embodiment, the second door  40  is referred to as the door  40 . 
     The installation portion  90  may be formed at the upper portion of the door  40 . The installation portion  90  may be configured to form a body of the door  40  at the upper portion thereof together with an outer door case  44  and an inner door case  45  of the door  40 . The installation portion  90  may be formed at an upper surface plate  46  forming an upper surface of the door  40 . The installation portion  90  may be integrally formed with the upper surface plate  46 . However, the present disclosure is not limited thereto, and the installation portion  90  may also be formed as a separate configuration from the upper surface plate  46 . 
     The installation portion  90  may include a rim portion  91  formed along a rim of the installation portion  90  and formed to be higher than an upper surface of an adjacent upper surface plate  46 . The rim portion  91  may be formed to be higher than the upper surface of an adjacent door  40  such that water, which may be accumulated on the upper surface of the upper surface plate  46 , may be prevented from flowing into the installation space  92 . 
     As described above, the installation portion  90  may be formed to be recessed from the upper surface of the door  40  to form the installation space  92 . The installation portion  90  may be configured such that an opening is formed at one side of the installation portion  90  to allow the printed circuit board  99  to be inserted thereinto and withdrawn therefrom. 
     The installation portion  90  may be formed such that a width in a second direction W 2 , which is the left-right direction of the door  40 , is larger than that in a first direction W 1 , which is the front-rear direction of the door  40 . That is, the installation space  92  may be configured such that the width in the second direction W 2  is larger than that in the first direction W 1 . 
     The installation portion  90  may include a guide rail  96  formed in a depth direction of the installation space  92 . The guide rail  96  may be formed in the depth direction of the installation space  92 , and may be formed to be recessed on an inner surface of a body of the installation portion  90 . When the printed circuit board  99  is installed at the installation portion  90 , the guide rail  96  is configured to guide insertion of the printed circuit board  99 . 
     The printed circuit board  99  may have a substantially plate shape. The installation portion  90  has the above-described configuration so that the printed circuit board  99  is inserted into the door  40  in parallel with front and rear surfaces of the door  40 , and a dimension of the printed circuit board  99  may not be limited by a width in the front-rear direction of the door  40 . 
     The installation portion  90  may include a reinforcing rib  98 . 
     The reinforcing rib  98  may be formed on an outer surface of the body of the installation portion  90 . At least one reinforcing rib  98  may be provided on the outer surface of the body of the installation portion  90 . In the present embodiment, a plurality of reinforcing ribs  98  are disposed to be spaced apart from one another and to be in parallel therewith. The reinforcing rib  98  may connect a lower surface of the upper surface plate  46  of the door  40  to the outer surface of the installation portion  90  such that durability of the installation portion  90  can be improved. The present disclosure is not limited to the description above, and the reinforcing rib  98  may be formed on only the outer surface of the installation portion  90  irrespective of the upper surface plate  46 . A foaming agent for insulation of the door  40  is impregnated into an interior formed by the installation portion  90 , the upper surface plate  46 , the outer case  14 , and the inner case  12 , and the reinforcing rib  98  may prevent deformation of the installation portion  90  caused by an impregnation pressure. 
     The installation portion  90  forms the body of the door  40  in association with the upper surface plate  46 , and the outer door case  44 , and the inner door case  45  of the door  40 . 
     A refrigerator according to another still another embodiment of the present disclosure will be described below. 
       FIG.  15    is a cross-sectional view of a door of a refrigerator according to still another embodiment of the present disclosure,  FIG.  16    is a perspective view of some components of the door of the refrigerator according to still another embodiment of the present disclosure,  FIG.  17    is an enlarged view of a portion Ain  FIG.  16   , and  FIG.  18    is a partial cross-sectional view of the door of the refrigerator according to still another embodiment of the present disclosure. 
     A refrigerator  1  may include a display device  60  having an input and output function. For user convenience, the display device  60  may be installed at a front surface of a door  30 . A display installation portion  134  may be formed to be recessed at the front surface of the door  30  to allow the display device  60  to be installed thereon. Since the display device  60  is formed in a substantially quadrangular shape, the display installation portion  134  may also be formed in a quadrangular shape. 
     The display installation portion  134  may include a heat dissipator  135  facing a rear surface of the display device  60  and configured to dissipate heat generated in the display device  60 . The heat dissipator  135  may be provided to have a dimension corresponding to the rear surface of the display device  60 . The heat dissipator  135  may form a gap between the display device  60  and the heat dissipator  135 . 
     The display device  60  generates heat while performing the input and output function, and the heat dissipator  135  receives and dissipates the heat generated from the display device  60  by spreading the heat to the entire door  30 . The heat dissipator  135  may be formed of a metal. 
     A display installation portion  34  may include an installation case  136  coupled to a rim of the heat dissipator  135  and forming a depth of an installation space of the display installation portion  34 . The installation case  136  may be formed by injection molding, and the heat dissipator  135  may be formed by press molding. 
     In the present embodiment, the installation case  136  and the heat dissipator  135  are formed as separate configurations, but the installation case  136  and the heat dissipator  135  may be integrally formed. Further, both of the installation case  136  and the heat dissipator  135  may be formed of metals. 
     The heat dissipator  135  includes a unit body  135   a  corresponding to the rear surface of the display device  60  and a unit rim portion  135   b  provided at a rim of the unit body  135   a  and coupled to the installation case  136 . The unit body  135   a  may be formed in an embossed shape for strength reinforcement. 
     The unit rim portion  135   b  may be formed to be bent from the unit body  135   a  at the rim of the unit body  135   a . The unit rim portion  135   b  may be bent from the unit body  135   a  toward the rear surface of the display device  60 . 
     The heat dissipator  135  may include a unit fixer  135   c  configured to be bent outward from the unit rim portion  135   b . The unit fixer  135   c  is configured to be fixed by a unit stopper  136   b  and a case holder  136   c  of the installation case  136 , which will be described below. The unit fixer  135   c  may be formed along at least a portion of the rim of the unit body  135   a.    
     The installation case  136  may include a case body  136   a , the unit stopper  136   b , and the case holder  136   c.    
     The case body  136   a  is configured to be coupled to the rim of the heat dissipator  135  and to form the depth of the display installation portion  134 . The case body  136   a  may include a unit seating surface  136   aa  on which the heat dissipator  135  is seated. The unit seating surface  136   aa  may be configured to be in contact with at least a portion of a front surface of the heat dissipator  135 . Further, the unit seating surface  136   aa  may be formed along at least a portion of the rim of the heat dissipator  135 , and, when the heat dissipator  135  is installed at the installation case  136 , the unit seating surface  136   aa  may be configured to prevent deformation of the installation position of the heat dissipator  135 . At least a portion of the front surface of the heat dissipator  135  is in contact with and is seated on the unit seating surface  136   aa  so that the unit seating surface  136   aa  may serve as a stopper configured to restrict a movement of the heat dissipator  135  toward the display device  60 . 
     The unit stopper  136   b  is configured to be provided on the installation case  136  to restrict a movement of the heat dissipator  135  so as to prevent the heat dissipator  135  from being moved in a direction toward the display device  60 . 
     The case holder  136   c  is formed to extend from the installation case  136  and to restrict the movement of the heat dissipator  135  so as to prevent the heat dissipator  135  from being moved in a direction away from the display device  60 . That is, the unit stopper  136   b  is configured to restrict the movement of the heat dissipator  135  in the front direction, and the case holder  136   c  is configured to restrict the movement of the heat dissipator  135  in the rear direction. The case holder  136   c  may elastically operate. That is, while the heat dissipator  135  is seated on the unit seating surface  136   aa , the unit rim portion  135   b  or the unit fixer  135   c  elastically pressurizes the case holder  136   c . When the heat dissipator  135  has been seated on the unit seating surface  136   aa , the case holder  136   c  elastically returns to its original position to restrict a movement of the unit fixer  135   c.    
     With such a configuration, the heat dissipator  135  may be coupled to the installation case  136  without a separate engagement structure, and the heat dissipator  135  may be configured not to escape from the installation case  136 . Alternatively, a separate engagement structure such as a screw coupling may be added for a coupling of the heat dissipator  135  and the installation case  136 . 
     A refrigerator according to yet another embodiment of the present disclosure will be described below. Description of a configuration overlapping with the above-described configurations will be omitted. 
       FIG.  19    is a perspective view of a refrigerator according to yet another embodiment of the present disclosure, and  FIG.  20    is a perspective view illustrating a state in which the door of the refrigerator according to yet another embodiment of the present disclosure is opened. 
     A refrigerator  201  includes a main body  210 , a storage compartment  220  formed inside the main body  210  and comparted into upper and lower portions, a door  230  configured to open and close the storage compartment  220 , and a cold air supply device (not shown) configured to supply cold air to the storage compartment  220 . 
     The main body  210  may include an inner case  212  configured to form the storage compartment  220 , an outer case  214  connected to the outside of the inner case  212  to form an exterior of the main body  210 , and insulation (not shown) to be foamed between the inner case  212  and the outer case  214  to insulate the storage compartment  220 . 
     The storage compartment  220  may be provided to have an open front surface, and may be comparted into a refrigerating compartment  222  at one side of the storage compartment  220  and a freezing compartment  224  at the other side thereof by a vertical partition (not shown). Positions of the refrigerating compartment  222  and the freezing compartment  224  are not limited, and, for convenience of description, the left side may be referred to as the freezing compartment  224  and the right side may be referred to as the refrigerating compartment  222  on the basis of a view from a front of the refrigerator  201 . The refrigerating compartment  222  and the freezing compartment  224  may be opened and closed by the doors  230  that are rotatably coupled to the main body  210 . 
     A pair of doors  230  may be disposed at the left and right sides, respectively. For convenience of description, a right door in the drawing is referred to as a first door  230 , and a left door is referred to as a second door  240 . A first door handle  238  is grippably provided at the first door  230  to open and close the first door  230 , and a second door handle  248  is grippably provided at the second door  240  to open and close the second door  240 . 
     A door shelf  235  may include a shelf supporter  235   a  extending vertically from each of the first and second doors  230  and  240  to support the door shelf  235  at left and right sides thereof. The shelf supporter  235   a  may be separably provided to each of the first and second doors  230  and  240  as a separate configuration, and, in the present embodiment, the shelf supporter  235   a  is provided to be formed to extend from each of the first and second doors  230  and  240 . 
     Further, a gasket  236  may be provided at an edge of the rear surface of each of the first door  230  and the second door  240  to seal a gap between the main body  210  and the first and second doors  230  and  240  in a state in which the first and second doors  230  and  240  are closed. 
     The gasket  236  may be installed in a form of a loop along the edge of the rear surface of each of the first door  230  and the second door  240 , and a magnet (not shown) may be include inside the gasket  236 . 
       FIGS.  21  and  22    are exploded views of some components of the refrigerator  201  according to yet another embodiment of the present disclosure. 
     The first door  230  may include a first inner door  231  and a first outer door  232 . In the present embodiment, the second door  240  is shown to be formed as a single door, but the present disclosure is not limited thereto, and, like the first door  230 , the second door  40  may be configured to be divided into a second inner door and a second outer door. 
     The first door  230  may include the first inner door  231  rotatably provided at the main body  210  and include the first outer door  232  rotatably provided at the first inner door  231 . The first outer door  232  may be configured to cover a front surface of the first inner door  231 . The door shelf  235 , the shelf supporter  235   a , and the gasket  236 , which are described above, may be formed at the first inner door  231 . Each of an outer case  231   a  and an inner case  231   b  of the first inner door  231  may have a quadrangular frame shape and a door opening having an open interior. The first outer door  232  may be configured to cover the door opening of the first inner door  231 . 
     More specifically, the first outer door  232  may include a protruding door surface  239  formed on a surface of the first outer door  32  facing the first inner door  231  to protrude toward a rear side of the first outer door  32 . The protruding door surface  239  is configured to correspond to the door opening of the first inner door  231 , and the protruding door surface  239  is configured to cover the door opening when the first outer door  232  is placed at a position closing the first inner door  231 . The protruding door surface  239  may protrude toward the rear side of the first outer door  232  therefrom to allow the insulation to be easily disposed inside the first outer door  232 . That is, a thickness of the first outer door  232  at a portion at which the protruding door surface  239  is disposed inside the first outer door  232  may be thicker than that of an adjacent portion thereof such that insulation performance of the first outer door  232  can be enhanced. 
     For convenience of the following description of the present embodiment, the first inner door  231  is referred to as an inner door  231 , and the first outer door  232  is referred to as an outer door  232 . Further, the following description will be made with respect to the first door  230 , but the present disclosure is not limited thereto, and the following description may also be applied to the second door  240 . For convenience of the following description of the present embodiment, the first door  230  is referred to as a door  230 . 
       FIG.  23    is a diagram illustrating an arrangement of electric wires inside an inner door of the refrigerator according to yet another embodiment of the present disclosure,  FIG.  24    is an enlarged view of a portion A in  FIG.  21   ,  FIG.  25    is an enlarged view of a portion B in  FIG.  21   , and  FIG.  26    is an enlarged view of a connector seating portion and an electric wire guide of the refrigerator according to yet another embodiment of the present disclosure. 
     The refrigerator  201  may include an electric wire connecting the door  230  to the main body  210  for an electronic device installed at the door  230 . The electric wire may include a first electric wire  264  and a second electric wire  266 . The first and second electric wires  264  and  266  may be referred to as an inner electric wire  264  and an outer electric wire  266 , respectively. The first and second electric wires  264  and  266  may include connectors  264   a  and  266   a  configured to mutually connect the first and second electric wires  264  and  266 . 
     The door  230  may include a connector seating portion  237  to connect the first and second electric wires  264  and  266 . The first and second connectors  264   a  and  266   a  formed at ends of the first and second electric wires  264  and  266 , respectively, may be configured to allow a mutual coupling of the first and second connectors  264   a  and  266   a  at the connector seating portion  237 . The connector seating portion  237  may be formed at an upper portion of the inner door  231  and may form a seating space  237   a  at an upper surface of the inner door  231 . The connector seating portion  237  may be formed to be recessed on the upper surface of the inner door  231 . The door  230  may include a cover  237   b  to cover the seating space  237   a  of the connector seating portion  237 . The cover  237   b  may be provided to be located on the same plane as the upper surface of the inner door  231 . The upper surface of the inner door  231  and an upper portion of the connector seating portion  237  may be configured to not have a height difference with an upper surface of the outer door  232 . That is, the upper surface of the inner door  231 , the upper surface of the connector seating portion  237 , and the upper surface of the outer door  232  may be configured to be located at the same height. With such a configuration, an aesthetic impression of an exterior appearance of the door  230  may be improved, and exposure of the connector seating portion  237  to the outside may be minimized to significantly reduce external influences. 
     The first electric wire  264  may be separably connected to the main body electric wire  277  of the main body  210 , and may be connected to a controller (not shown) or a power supply device (not shown) that is connected to the main body electric wire  277 . The first electric wire  264  may extend to the inner door  231  to be connected to the second electric wire  266 . The first electric wire  264  may be connected to the connector seating portion  237  through a first electric wire outlet  237   c  of the inner door  231 . One end of the first electric wire  264  may be withdrawn through a hollow portion  274   a  of a hinge rotation axis  274  to be connected to the main body electric wire  277 . The other end of the first electric wire  264  may be withdrawn through the first electric wire outlet  237   c  formed at the connector seating portion  237  to be connected to the second electric wire  266 . 
     The second electric wire  266  may be configured to be connected to an electric device installed at the outer door  232 . For example, the second electric wire  266  may be connected to the display device  260  to transmit information between the display device  260  and the controller or to supply power to the display device  260 . 
     The first and second electric wires  264  and  266  are coupled at the connector seating portion  237  of the inner door  231  to facilitate separation of the outer door  232  from the inner door  231 . That is, when the outer door  232  is separated from the inner door  231 , the first and second connectors  264   a  and  266   a  of the first and second electric wires  264  and  266 , which are seated at the connector seating portion  237 , may separate from each other such that an electrical connection may be disconnected or released, and the outer door  232  may be physically separated from the inner door  231 . 
     For convenience of description, each of the first and second electric wires  264  and  266  is described as a single wire, but a plurality of the first and second electric wires  264  and  266  may be formed. 
     The main body electric wire  277  and the first and second electric wires  264  and  266  may be connected in series. That is, the main body electric wire  277 , the first electric wire  264 , and the second electric wire  266  may be provided to be sequentially connected. The outer door  232  is provided to be separable from the inner door  231  together with the second electric wire  266 , and the inner door  231  is provided to be separable from the main body  210  together with the first electric wire  264 . 
     By disconnecting the first electric wire  264  from either the main body electric wire  277  or the second electric wire  266 , the inner door  231  or the outer door  232  may be configured to be selectively separable. That is, by disconnecting the main body electric wire  277  from the first electric wire  264 , the inner door  231  is in a state of being separable from the main body  210 . Since the outer door  232  is coupled to the inner door  231 , both of the inner door  231  and the outer door  232  are in a state of being separable from the main body  210  through the above-described process. Further, by disconnecting the second electric wire  266  from the first electric wire  264 , the outer door  232  is in a state of being separable from the inner door  231 . With such a configuration, when the door  230  is assembled to or separated from the main body  210 , assembly of the refrigerator  201  may be improved. That is, when the door  230  is coupled to the main body  210 , the inner door  231  and the outer door  232  may be sequentially coupled to the main body  210 , or both of the inner door  231  and the outer door  232 , which are coupled to each other, may be coupled to the main body  210 . A separation of the door  230  from the main body  210  may be performed in an order opposite to that in which the door  30  is coupled to the main body  10 . 
     The door  230  may include a hinge assembly  280 . The hinge assembly  280  may be a component of the inner door  231 . The hinge assembly  280  may be connected to the connector seating portion  237 , and may be configured to form a center of rotation of the outer door  232 . The hinge assembly  280  may be configured to guide the second electric wire  266  from the center of rotation of the outer door  232  to the connector seating portion  237 . 
     The hinge assembly  280  may be provided to be separable from the inner door  231 . The hinge assembly  280  may guide the second electric wire  266  from the outer door  232  to the inner door  231 , and may form the center of rotation of the outer door  232  relative to the inner door  231 . 
     The hinge assembly  280  may include a hinge bracket  282 . The hinge bracket  282  is provided at one door  230  of the inner door  231  and the outer door  232 , and is configured to allow the other door  230  to be rotatable. In the present embodiment, the hinge bracket  282  is installed at the inner door  231 , and the outer door  232  is configured to be rotated on the basis of a rotational shaft  283  formed at the hinge bracket  282 . However, the present disclosure is not limited to the described above, the hinge bracket  282  may be installed at the outer door  232 , and the rotational shaft  283  formed at the hinge bracket  282  may be configured to be coupled to the inner door  231  to allow the outer door  232  to be rotated relative to the inner door  231 . The hinge bracket  282  may be disposed adjacent to the connector seating portion  237 . The hinge bracket  282  may include a hinge body  282   a  and the rotational shaft  283 . 
     The hinge assembly  280  may include an electric wire guide  286 . 
     The electric wire guide  286  may form a guide space  287  guiding the second electric wire  266 . The electric wire guide  286  may be configured as a configuration separate from the hinge bracket  282 . However, the present disclosure is not limited to the described above, and the electric wire guide  286  and the hinge bracket  282  may be integrally formed. The electric wire guide  286  may be connected to the connector seating portion  237 , and may be formed to extend to the center of rotation of the outer door  232 . With such a configuration, the second electric wire  266  may be guided from the center of rotation of the outer door  232  to the connector seating portion  237  through the guide space  287  of the electric wire guide  286 . 
     The electric wire guide  286  may include a guide opening  286   c  connected to the seating space  237   a  of the connector seating portion  237 . The second electric wire  266  may be disposed in the seating space  237   a  of the connector seating portion  237  by passing through the guide space  287  of the electric wire guide  286  via the guide opening  286   c . Even though the cover  237   b  and the guide cover  286   b  are seated on the connector seating portion  237  and the guide body  286   a , respectively, the guide opening  286   c  may be maintained in an open state. 
     The electric wire guide  286  may include a guide body  286   a  having an open one side and a guide cover  286   b  configured to cover the open one side. The guide body  286   a  may be recessed to form the guide space  287 . 
     The outer door  232  includes an assembly insertion portion  289  provided at an inner surface of the outer door  232 , which faces the inner door  231 , and formed to be recessed to allow at least a portion of the hinge assembly  280  to pass through the assembly insertion portion  289 . 
     The assembly insertion portion  289  is configured such that, in a state in which the outer door  232  and the inner door  231  are in close contact with each other, the hinge assembly  280  formed to protrude from the inner door  231  does not interfere with an operation of the outer door  232 . The assembly insertion portion  289  may be formed to be recessed on the inner surface of the outer door  232 . 
     The outer door  232  may include an extension guide  288  provided at an upper portion of the assembly insertion portion  289  and through which the second electric wire  266  passes. The extension guide  288  is provided to be separable from the outer door  232 . The extension guide  288  is provided to guide the second electric wire  266 , which is connected from the electric device of the outer door  232 , to the electric wire guide  286 . When the extension guide  288  is installed at the outer door  232 , the extension guide  288  may be provided to form a surface coinciding with the inner surface of the outer door  232 . 
     The extension guide  288  may include a guide rib  288   a , a guide cover  288   b , and a guide space  288   c . The outer door  232  may include a second electric wire outlet  290  disposed at an end of the extension guide  288 . The second electric wire  266  may be withdrawn from the second electric wire outlet  290  to be guided through the guide space  288   c  of the extension guide  288 . The guide rib  288   a  extending from the second electric wire outlet  290  to the center of rotation of the outer door  232  may be formed on an inner side surface of the outer door  232 . The guide cover  288   b  may be configured to cover the guide rib  288   a  to prevent the second electric wire  266  from being exposed to the outside. The guide rib  288   a  and the guide cover  288   b  are configured to guide the second electric wire  266  from the second electric wire outlet  290  toward the center of rotation of the outer door  232 . The guide rib  288   a  and the guide cover  288   b  may form the guide space  288   c  guiding the second electric wire  266 . 
     The guide cover  288   b  may be configured to be fitted in and coupled to the inner side surface of the outer door  232 . A coupling hole  232   a  may be formed at the outer door  232 , and the guide cover  288   b  may include a coupling protrusion  288   bb  inserted into the coupling hole  232   a . The coupling protrusion  288   bb  may be elastically formed at a cover body  288   ba  of the guide cover  288   b . The coupling hole  232   a  may be formed at the upper surface of the outer door  232 , and the coupling protrusion  288   bb  may be formed at one side surface of the guide cover  288   b , more specifically at an upper surface of the cover body  288   ba . When the guide cover  288   b  is installed at the inner side surface of the outer door  232 , the coupling protrusion  288   bb  is inserted to be fitted in and coupled to the coupling hole  232   a.    
     In order to separate the guide cover  288   b  from the outer door  232 , the coupling protrusion  288   bb  inserted into the coupling hole  232   a  is pressurized to protrude from the coupling hole  232   a . Since the coupling protrusion  288   bb  is provided to have elasticity with respect to the cover body  288   ba , when the guide cover  288   b  is separated from the outer door  232 , the coupling protrusion  288   bb , which has been pressurized and depressed, elastically returns to its original position. 
     The extension guide  288  guides the second electric wire  266  to the center of rotation of the outer door  232 , and the electric wire guide  286  guides the second electric wire  266  from the center of rotation of the outer door  232  to the connector seating portion  237 . With such a configuration, the second electric wire  266  passing through the electric wire guide  286  may pass through the center of rotation of the outer door  232  to extend to the hinge assembly  280 . 
     With such a configuration, even when the inner door  231  or the outer door  232  is rotated, a distance, an angle, and an arrangement between the rotational shaft  283  and the connector seating portion  237  may be kept constant. In this way, a length of the second electric wire  266  may be kept constant. The second electric wire  266  may extend to the connector seating portion  237  without being affected by a rotational movement of the door  230 . 
     The first electric wire  264  may be connected to the main body electric wire  277  of the main body  210 , and may be configured to pass through the hollow portion  274   a  formed in the hinge rotation axis  274 . The first electric wire  264  may extend to the connector seating portion  237  by passing through the hollow portion  274   a  and a lower portion of the upper surface of the inner door  231 . The first electric wire  264  extending to the connector seating portion  237  may be connected to the second electric wire  266  extending to the connector seating portion  237 . 
     Assembly and disassembly of the refrigerator according to an embodiment of the present disclosure will be described below. 
       FIG.  27    is an exploded perspective view of some components of the refrigerator according to yet another embodiment of the present disclosure. Descriptions will be made with reference to the preceding drawings. 
     A method of separating the outer door  232  from the inner door  231  will be described. 
     The cover  237   b  is opened from the connector seating portion  237  and the first and second connectors  264   a  and  264   b  disposed in the seating space  237   a  are separated from each other. When the guide cover  286   b  of the electric wire guide  286  is opened, the second electric wire  266  is exposed to the outside. 
     That is, when the first and second connectors  264   a  and  264   b  are separated from each other and the cover  237   b  and the guide cover  286   b  are separated from the connector seating portion  237  and the guide body  286   a , respectively, the second electric wire  266  is in a state of having been separable from the inner door  231 . 
     The hinge assembly  280  is separated from the inner door  231  such that the outer door  232  is separated from the inner door  231 . However, the present disclosure is not limited the described above, the outer door  232  may be separated from the rotational shaft  283  formed at the hinge bracket  282  such that the outer door  232  may be separated from the inner door  231 . Alternatively, the guide cover  288   b  of the extension guide  288  may be separated from the outer door  232 , and then the outer door  232  may be separated from the inner door  231 . 
     Next, a method of separating the inner door  231  from the main body  210  will be described. In the case of the refrigerator according to the present embodiment, when the inner door  231  is separated from the main body  210 , the process of separating the outer door  232  from the inner door  231  is not necessarily preceded. Alternatively, the outer door  232  may be separated from the inner door  231 , and then the inner door  231  may be separated from the main body  210 . However, the present disclosure is not limited thereto, and in a state in which the inner door  231  and the outer door  232  are coupled, the inner door  231  may be separated from the main body  210 . In this case, the door  230  is separated from the main body  210 . 
     After a main body cover  276  provided at an upper portion of the main body  210  is separated therefrom, a main body connector  277   a  of the main body electric wire  277  and a connection connector  264   b  of the first electric wire  264  are separated from each other. Through such an operation, an electrical connection between the door  230  and the main body  210  may be disconnected. Consequently, the door  230  is in a state of being separable from the main body  210 . Thereafter, a door hinge  270  and the hinge rotation axis  274  are separated from each other, the door  230  may be separated from the main body  210 . 
     An operation of the refrigerator according to the embodiment of the present disclosure will be described below. 
       FIGS.  28 ,  29 , and  30    are diagrams illustrating operations of the refrigerator according to yet another embodiment of the present disclosure. 
       FIG.  28    illustrates a closed state  230   a  in which both of the outer door  232  and the inner door  231  are closed,  FIG.  29    illustrates a partially open state  230   b  in which the outer door  232  is in opened and the inner door  231  is closed, and  FIG.  30    illustrates an open state  230   c  in which the inner door  231  is opened relative to the main body  210  and the outer door  232  is opened relative to the inner door  231 . Although not shown in the drawing, both of the inner door  231  and the outer door  232  may operate in an open state with respect to the main body  210 . For convenience of description, a state of the door  230  in  FIG.  28    may be referred to as the closed state  230   a , a state of the door  230  in  FIG.  29    may be referred to as the partially open state  230   b , and a state of the door  230  in  FIG.  30    may be referred to as an open state  230   c . In the open state  230   c  of the door  230 , the inner door  231  and the outer door  232  may be separated as shown in  FIG.  10   , but both of the inner door  231  and the outer door  232  may be in close contact with each other to operate in an open state with respect to the main body  210 . 
     In the closed state  230   a  as shown in  FIG.  28   , the inner door  231  is rotatably provided at the main body  210  by the door hinge  270 , and the outer door  232  is rotatably provided at the inner door  231  by the hinge assembly  280 . 
     Descriptions will be made with reference to  FIG.  29   . In the partially open state  230   b , the outer door  232  is separated from the inner door  231  and is rotated on the basis of the rotational shaft  283  of the hinge assembly  280 . Since the hinge assembly  280  is installed at the inner door  231 , the hinge assembly  280  is fixed to the inner door  231  without moving even when the outer door  232  is rotated. 
     Descriptions will be made with reference to  FIG.  30   . In the open state  230   c , the outer door  232  is separated from the inner door  231  and is rotated on the basis of the rotational shaft  283  of the hinge assembly  280 , and the inner door  231  is separated from the main body  210  and is rotated on the basis of the hinge rotation axis  274  of the door hinge  270 . As shown in  FIG.  30   , since the hinge assembly  280  is installed at the inner door  231 , even when the outer door  232  and the inner door  231  are rotated, the hinge assembly  280  is fixed to the inner door  231  without operation. With such a configuration, the distance, angle, and arrangement between rotational shaft  283  of the hinge assembly  280  and the connector seating portion  237  may be kept constant even when the door  230  is being rotated, so that the second electric wire  266  extending from the rotational shaft  283  of the outer door  232  to the connector seating portion  237  may not be affected by the operation of the door  230 . Furthermore, since the second electric wire  266  is connected to the first electric wire  264  without being affected by the operations of the outer door  232  and the inner door  231 , power may be stably supplied to electronic devices installed at the outer door  232 , and a signal transmission between the electronic devices and a controller may be smoothly performed. In addition, the second electric wire  266  is not affected by repetitive rotational operations of the door  230  such that durability of the second electric wire  266  can be improved. 
     In accordance with one aspect of the present disclosure, the connection between the electronic device and the refrigerator is improved such that durability of the electric wires can be improved. 
     In accordance with another aspect of the present disclosure, connections between the electric wires are improved so as not to be influenced by the rotational movement of the door such that durability of the electric wires can be improved. 
     In accordance with still another aspect of the present disclosure, exposure of the electric wires can be minimized such that damage from external influences can be significantly reduced. 
     In accordance with yet another aspect of the present disclosure, the display device is applied to the door such that user convenience can be improved. 
     In accordance with yet another aspect of the present disclosure, an arrangement structure of electric components is improved such that space efficiency can be improved and heat insulation efficiency of the refrigerator can be improved. 
     Hereinbefore, specific embodiments are shown and described. However, the present disclosure is not limited to these specific embodiments, various modified embodiments can be devised from those skilled in the art without departing from the gist of a technical spirit that is defined by the appended claims. 
     Although the present disclosure has been described with an exemplary embodiment, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.