Patent Publication Number: US-2022230517-A1

Title: Information output device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in part of U.S. patent application Ser. No. 17/115,438, filed on Dec. 8, 2020, which is a continuation-in part of International Patent Application No. PCT/KR2019/006857, filed on Jun. 7, 2019, which claims priority to Korean patent application No. 10-2018-0066339 filed on Jun. 8, 2018, contents of each of which are incorporated herein by reference in their entireties. This continuation-in-part application also claims priority to Korean patent application No. 10-2021-0186176 filed on Dec. 23, 2021, the contents which are incorporated herein by reference in its entirety. 
    
    
     BACKGROUND 
     Technical Field 
     One or more embodiments of the disclosure relate to an information output device. 
     Description of Related Technology 
     Users may recognize information in a variety of ways. To this end, various types of information output apparatus are used. 
     For example, a visual information output apparatus using a printed material, and an acoustic information output apparatus using sound are used. 
     In particular, in modern times, information output apparatus including electronic technology is also frequently used in accordance with an increase of information amount and technological development, and a display device having a plurality of pixels is commonly used as a visual information output apparatus. 
     SUMMARY 
     Embodiments of the present disclosure provide a tactile implementation information output apparatus that is easy to assemble and design, and is simple to maintain. 
     In addition, embodiments of the present disclosure provide an information output apparatus that may improve durability and user convenience, and minimize power use. 
     An information output apparatus in accordance with An embodiment of the present disclosure may comprise at least one unit block module each including a plurality of expression holes, at least one first fastening part and at least one second fastening part provided in a form that may be coupled to the at least one first fastening part, a plurality of pins located in each of the at least one unit block module and moved to be exposed through the plurality of expression hole, a plurality of activation modules located in each of the at least one unit block module, moving the plurality of pins, and each including a coil, a control panel coupled to the at least one unit block module and including a plurality of terminals electrically connected to the coils of the plurality of activation modules and a control module electrically connected to the plurality of terminals and provided to control an operation of the plurality of activation modules. 
     The at least one unit block module includes a first unit block module and a second unit block module adjacent to each other, and a first fastening part of the first unit block module and a second fastening part of the second unit block module are coupled, and the first unit block module and the second unit block module may be coupled to the control panel. 
     Each of the at least one unit block module includes a housing having a first surface, a second surface and a third surface facing in different directions, and wherein the plurality of expression holes are located on the first surface, the first fastening part is located on the second surface, and the second fastening part may be located on the third surface. 
     Each of the plurality of activation modules may include a driving unit including the coil and a moving unit placed between the driving unit and the plurality of pins, including a magnetic member having a first polarity and a second polarity, and providing motion to the plurality of pins. 
     The information output device may further include a partition wall positioned between the driving unit and the moving unit. 
     The moving unit may be rotatably provided. 
     The magnetic member may be disposed at a position spaced apart from a center of the moving unit. 
     A rotation center of the moving unit may be arranged to be spaced apart from a center of rotation of the moving unit. 
     A rotation center of the moving unit may be provided to be movable. 
     The driving unit may further include a support projecting toward the moving unit. 
     Other aspects, features, and advantages than those described above will become apparent from the following drawings, claims, and detailed description of the disclosure. 
     An information output apparatus according to the embodiments of the present disclosure may easily configure and/or design various sized apparatus by using a unit block module. 
     The information output apparatus according to the embodiments of the present disclosure may be easily maintained when a specific unit block module fails. 
     The information output apparatus according to the embodiments of the present disclosure may improve durability and user convenience. 
     The information output apparatus according to the embodiments of the present disclosure may provide a waterproof function when a pin is exposed to a moisture environment. 
     The information output apparatus according to the embodiments of the present disclosure may reduce power consumption and enable low power operation. 
     The information output apparatus according to the embodiments of the present disclosure may minimize an operation error of a driving module. 
     The information output apparatus according to the embodiments of the present disclosure may maintain a position of the pin even when the voltage is not applied, so that an optimal tactile expression may be realized in a state in which power use is minimized. 
     Also provided is an information output apparatus including: an upper unit accommodating an expression unit therein, the expression unit being formed to move in at least one direction and to be sensed by a user; a lower unit arranged to overlap the upper unit and formed to accommodate a driving force providing unit for providing a driving force for the expression units; and a base unit arranged to overlap the lower unit and face a surface opposite to a surface, facing the upper unit, of the lower unit. 
     According to the embodiment, the upper unit may be formed to accommodate a plurality of expression units. 
     According to the embodiment, the lower unit may be formed to accommodate a plurality of driving force providing units corresponding to the plurality of expression units. 
     According to the embodiment, the driving force providing unit may include a coil unit arranged around a driving support unit. 
     According to the embodiment, the upper unit may be formed to be coupled to or separated from the lower unit. 
     According to the embodiment, coupling or separation between the upper unit and the lower unit may be performed by a pressure or a tensile force applied from an external source. 
     According to the embodiment, the lower unit may be formed to be coupled to or separated from the base unit. 
     According to the embodiment, the upper unit may include a moving unit or a moving part to be moved by a driving force provided by the driving force providing unit, to transfer the driving force to the expression unit. 
     According to the embodiment, the moving unit or the moving part may be formed to perform an angular movement or a rotational movement in at least one direction. 
     According to the embodiment, a plurality of information output apparatuses may be arranged 
     to be adjacent to each other in a direction adjacent to at least one of a plurality of side surfaces of the upper unit, the lower unit, and the base unit. 
     Other aspects, features and advantages of the present disclosure will become better understood through the accompanying drawings, the claims and the detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings. 
         FIG. 1  is a perspective view schematically showing an information output apparatus according to an embodiment. 
         FIG. 2  is a perspective view schematically showing an information output apparatus according to another embodiment. 
         FIG. 3  is a configuration diagram schematically showing an information output module according to an embodiment. 
         FIG. 4  is a view showing an aspect of a unit block module according to an embodiment. 
         FIG. 5  is a view showing another aspect of a unit block module according to an embodiment. 
         FIG. 6  is a configuration diagram schematically showing an information output unit according to an embodiment. 
         FIG. 7  is a configuration diagram schematically showing an information output unit according to another embodiment. 
         FIG. 8  is a view schematically showing an embodiment of a moving unit. 
         FIG. 9  is a view schematically showing another embodiment of a moving unit. 
         FIG. 10  is a view schematically showing another embodiment of a moving unit. 
         FIG. 11  is a view schematically showing another embodiment of a moving unit. 
         FIG. 12  is a view schematically showing an embodiment of a holder of a moving unit. 
         FIG. 13  is a view schematically showing another embodiment of a holder of a moving unit. 
         FIG. 14  is a view schematically showing another embodiment of a holder of a moving unit. 
         FIG. 15  is a view schematically showing an embodiment of a drive unit. 
         FIG. 16  is a view schematically showing another embodiment of a drive unit. 
         FIG. 17  is a view showing an embodiment of an assembly of a driving unit and a moving unit. 
         FIG. 18  is a view schematically showing another embodiment of a pin. 
         FIGS. 19A and 19B  show sectional views of the information output unit according to another embodiment of the disclosure in a pin down state. 
         FIGS. 20A and 20B  show sectional views of the information output unit according to another embodiment of the disclosure in a pin up state. 
         FIG. 21  is a perspective view schematically illustrating an information output apparatus according to an embodiment of the present disclosure. 
         FIG. 22  is an exploded perspective view illustrating the information output apparatus of  FIG. 21 . 
         FIGS. 23 to 26  are diagrams for describing an upper unit according to an embodiment of the present disclosure. 
         FIGS. 27 to 31  are diagrams for describing an lower unit according to an embodiment of the present disclosure. 
         FIG. 32  is an exemplary diagram for describing driving support units and coil units accommodated in a lower unit, according to an embodiment of the present disclosure. 
         FIG. 33  is a cross-sectional view taken along line XIII-XIII of  FIG. 32 . 
         FIG. 34  is a diagram illustrating a modification of a driving support unit and a coil unit of  FIG. 33 . 
         FIGS. 35 to 37  are diagrams for describing a base unit according to an embodiment of the present disclosure. 
         FIGS. 38 to 40  are diagrams for describing an information output apparatus according to another embodiment of the present disclosure. 
         FIG. 41  is a diagram illustrating an assembly of a driving unit and a moving unit, according to another embodiment. 
         FIG. 42  is a schematic perspective view for describing a moving part of  FIG. 41 . 
         FIG. 43  is a front view of the moving part of  FIG. 42  seen from one direction. 
         FIG. 44  is a partially perspective view of the assembly of  FIG. 41  seen from one direction. 
         FIGS. 45 and 46  are diagrams for describing a relationship between a moving part and an expression unit, according to another embodiment of the present disclosure. 
         FIGS. 47 and 48  are perspective views of moving parts illustrated in  FIGS. 45 and 46 , according to alternative embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     However, in the case of such a display device, various circuits are built in, so that manufacturing is not easy and control is inconvenient. 
     On the other hand, various forms of information output are required due to technological development and diversification of lifestyle. 
     For example, various information output apparatuses may be required according to a situation of each user, and in particular, when a user has a certain weakened sense, for example, when the user is visually impaired, it is necessary to output information through tactile sense. 
     To output information through the tactile sense, a pin needs to be driven. When a specific driving unit malfunctions, the entire device needs to be disassembled or replaced to repair the same. In addition, as the area of the device increases, there is a limitation that design and assembly become more difficult. In addition, in the case of the output of information through tactile sense, it is difficult to easily control and stably derive the same. Thus, there is a limitation in improving user&#39;s convenience through an improvement in information output apparatuses. 
     The embodiments may have various transformations, and specific embodiments are illustrated in the drawings and are described in detail in the detailed description. Effects and features of the embodiments, and methods of achieving them will be clarified through the following description in detail with reference to the drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various forms. 
     The embodiments will be described below in more detail with reference to the accompanying drawings. Those components that are the same or are in correspondence are rendered the same reference numeral regardless of the figure number, and redundant explanations are omitted. 
     While such terms as “first,” “second,” etc., used in embodiments may be used to describe various components, such components must not be limited to the above terms. The above terms are used only to distinguish one component from another. 
     In all embodiments of the specification herein, a unit may denote a single component that executes a certain program, but embodiments of the present disclosure are not limited thereto, and may be a partitioned area of at least one storage medium storing the program. 
     In the following embodiments, an expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning in the context. In the present specification, it is to be understood that the terms such as “including,” “having,” and “comprising” are intended to indicate the existence of the features or components disclosed in the specification, and are not intended to preclude the possibility that one or more other features or components may exist or may be added. 
     In the drawings, the size of components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the following embodiments are not necessarily limited to those illustrated. 
       FIG. 1  is a perspective view schematically showing an information output apparatus according to an embodiment. 
     Referring to  FIG. 1 , an information output apparatus according to an embodiment may include an expression surface  100  having a plurality of first expression holes  100   a . The expression surface  100  may include a flat surface as shown in  FIG. 1 . 
     At least one information output module IM is located inside the expression surface  100 , and a pin  400  of each information output module IM may express a protruding signal on the expression surface  100  by entering and exiting the expression surface  100  through the first expression hole  100   a . Such the protruding signal may constitute a variety of signal systems by the plurality of pins  400  selectively repeating entry and exit at the first expression hole  100   a.    
     In the information output apparatus, the expression surface  100  may be formed to face a user. Therefore, the protruding signal by the selective entry and exit of the plurality of pins  400  exposed on the expression surface  100  may be recognized as a direct and local tactile sensation to the user, and the user may receive direct vibration in a position where the user receives tactile sensation from the plurality of pins  400 . The protruding signal formed by such a direct and local tactile sensation may transmit an accurate signal to the user because residual vibration does not occur around the target, unlike a general vibration signal of portable electronic devices. Accordingly, a signal acquired through tactile sense such as braille may be implemented by the protruding signal as described above, and various other signals such as a military signal, a picture signal, a code signal, and a direction signal may be accurately implemented. 
       FIG. 2  is a perspective view schematically showing an information output apparatus according to another embodiment. 
     The information output apparatus according to the embodiment illustrated in  FIG. 2  has an expression surface  100 ′ including a curved surface. The expression surface  100 ′ including such the curved surface also has a plurality of first expression holes  100   a , and at least one information output module IM may be located inside a first expression hole  100   a . Although the curved surface is shown in  FIG. 2  as a surface having a single curvature, embodiments are not limited thereto, and the curved surface may include an irregular curved surface having a plurality of curvatures. In this case, an open direction of at least some of the plurality of first expression holes  100   a  may be different from each other, and accordingly, an entry direction of at least a portion of the plurality of pins  400  may also be different from each other. 
     As such, the information output apparatus according to the embodiments includes the at least one information output module IM, and  FIG. 3  is a configuration diagram schematically showing the information output module IM according to an embodiment. 
     Referring to  FIG. 3 , an embodiment of the information output module IM may include at least one unit block module UM. According to the embodiment illustrated in  FIG. 3 , it is shown that the information output module IM include four unit block modules UM that are coupled together in a line. The present disclosure is not necessarily limited to this, and a plurality of unit block modules UM may be coupled in various directions. 
     The unit block module UM may include a plurality of second expression holes  613 , and the second expression holes  613  may be aligned with the first expression holes on the expression surface. The plurality of pins  400  may selectively entry and exit through the second expression holes  613 . 
     The information output module IM further includes a control plate  700 . 
     The control plate  700  may include a circuit pattern, and may include a plurality of terminals  710  to be exposed at least to the outside. Each of the plurality of terminals  710  is electrically connected to an activation module located in the unit block module UM, and accordingly, an electrical signal may be applied to the activation module. 
     The plurality of unit block modules UM may be coupled to one control plate  700 . However, the present disclosure is not limited to the embodiment in which one information output module IM includes one control plate  700 . In an embodiment, one information output module IM may include a plurality of control plates  700 . 
     The unit block module UM may include a housing  610  as shown in  FIGS. 4 and 5 . 
     According to an embodiment, the housing  610  may include a first housing  611  and a second housing  612  which are coupled to each other. The first housing  611  faces the expression surface, and the second housing  612  may be coupled to the control plate  700 . Therefore, although not shown in the drawings, the first housing  611  may further include a coupling element that may be coupled to the inside of the expression surface, and the second housing  612  may further include a coupling element that may be coupled to the control plate  700 . 
     The unit block module UM may be provided with a first fastening part  614  and a second fastening part  615  in the housing  610 . The first fastening part  614  and the second fastening part  615  are provided to be fastened to each other, and are formed for the coupling to adjacent unit block modules. According to an embodiment, the first fastening part  614  may be at least one protrusion protruding outward. In addition, the second fastening part  615  may be at least one groove that is introduced inward to face the at least one protrusion. Therefore, the first fastening part and the second fastening part of adjacent unit block modules may be fastened to each other. The structures of the first fastening part  614  and the second fastening part  615  are not necessarily limited thereto, and various other types of fastening structures coupled to and fastened to each other may be applied. 
     According to an embodiment, the housing  610  may include a first surface  6101 , a second surface  6102 , and a third surface  6103  facing different directions. In this case, the first surface  6101  may be a surface facing an inner surface of the expression surface  100  of  FIGS. 1 and 2 , and the second surface  6102  and the third surface  6103  may each be a surface that extends perpendicular to the first surface  6101 . According to  FIGS. 4 and 5 , the second surface  6102  and the third surface  6103  may be opposed to each other, but embodiments of the present disclosure are not limited thereto. In an embodiment, the second surface  6102  and the third surface  6103  may be disposed perpendicular to each other. 
     In the structure of the housing  610 , the second expression hole  613  may be formed on the first surface  6101 . Therefore, the pin  400  is selectively projected out of the housing  610  through the first surface  6101 . 
     The second surface  6102  and the third surface  6103  may each be a surface facing an adjacent unit block module (UM). The first fastening part  614  may be located on the second surface  6102  and the second fastening part  615  may be located on the third surface  6103 . Therefore, a first unit block module and a second unit block module adjacent to the first unit block module may be fastened in such a way that a first fastening part of the first unit block module and a second fastening part of the second unit block module are fastened to each other. At this time, the first surfaces of the adjacent unit block modules are connected to each other to form a flat surface. 
     In the present disclosure, the plurality of unit block modules UM are fastened in one direction, thereby constituting one information output module IM. When a braille display device is implemented, the unit block module UM may be a unit constituting one braille character, and to this end, may include pins  400  of 2×3 or 2×4. In addition, as a plurality of such unit block modules UM are connected, a pad implementing braille information with a plurality of pins  400  may be formed. According to the present disclosure, as described above, unit block modules UM are coupled to constitute the information output module IM. Thus, apparatuses of various sizes can be simply configured and/or designed and, when a specific unit block module UM malfunctions, the maintenance may be easily performed. 
     In the embodiment illustrated in  FIG. 3 , one information output module IM is configured by coupling a plurality of unit block modules UMs, but embodiments are not limited thereto. In an embodiment, one unit block module UM may constitute one information output module IM. In this case, the first fastening part  614  and the second fastening part  615  of the unit block module UM are coupled to a casing of the apparatus and may fix the unit block module UM. 
     Optionally, in the information output module IM according to an embodiment, the first surface  6101  of the housing  610  constituting the unit block module UM may be the expression surface as described above. Therefore, in this case, the information output apparatus may be configured with the first surface  6101  exposed to the outside. 
     Each unit block module UM may include an information output unit IU as illustrated in  FIG. 6  therein. 
     Each information output unit IU may include an activation module DM positioned opposite to the pin  400 . The activation module DM may be electrically connected to the terminal  710  of the control plate  700 , and the terminal  710  may be electrically connected to a control module CM. Therefore, the activation module DM may be electrically connected to the control module CM. The control module CM may control the operation of each activation module DM by transmitting a signal for protruding and entering the pin  400  to the activation module DM. 
     The activation module DM generates a driving force according to the signal of the control module CM and transmits the driving force to the pin  400 , and various driving modules for protruding and entering the pin  400  may be applied. 
       FIG. 7  schematically shows an embodiment of the activation module DM. 
     Referring to  FIG. 7 , the embodiment of the activation module DM may include a driving unit  200  and a moving unit  300 . 
     The driving unit  200  may include a coil (not shown) electrically connected to the control module CM. The coil may be wound along a first direction X1, whereby a magnetic field may be formed in a second direction X2 as an electrical signal is applied from the control module CM. The driving unit  200  may be provided to maintain a fixed state thereof. The expression “electrically connected” does not necessarily mean a wired connection, but also means that an electrical signal may be transmitted by wireless communication, and includes a case in which another transmission medium exists between them. This may be applied equally to the embodiments of the present specification. 
     The moving unit  300  may be provided to move in response to an operation of the driving unit  200 , more specifically, a magnetic field formed by a coil included in the driving unit  200 . To this end, the moving unit  300  may include a magnet (not shown). The magnet has a first polarity and a second polarity opposite to the first polarity and thus, in response to the magnetic field formed by a coil, the magnet may move the moving unit  300  in the second direction X2. The movement of the moving unit  300  is transmitted to the pin  400 , and thus, the protruding and entering movement of the pin  400  may be performed. 
     According to an embodiment, the moving unit  300  may be provided to perform a rotational movement, which may include movement in the second direction X2 as a result. The moving unit  300  may move depending on the movement of the driving unit  200 , and thus may not be electrically connected to the control module CM. 
     The pin  400  is driven by the moving unit  300 , and may move along the second direction. 
     According to an embodiment, the pin  400  may be in contact with the moving unit  300 . In this case, since the moving unit  300  includes movement in the second direction X2, the pin  400  may selectively enter and exit through the expression hole along the second direction X2. The pin  400  may be coupled to the moving unit  300 , but embodiments of the present disclosure are not limited thereto, and may include a transmission medium (not shown) for transferring physical motion between the moving unit  300  and the pin  400 . 
     According to embodiments of the present disclosure, it is not necessarily limited thereto, and at least some of the pins  400  may be separated from the moving unit  300 . In this case, the pin  400  may move in the second direction by being directly connected to the moving unit  300 , or by being indirectly linked to the moving unit  300  via a separate link mechanism (not shown) or a motion transmission mechanism (not shown). The direction of movement of the pin  400  may include a second direction X2, and may be various directions including the first direction X1. In this case, the movement direction of the pin  400  may be an entry/exit direction for implementing the above-described protruding signal. The following description is based on the embodiment in which the pin  400  is coupled to the moving unit  300 , but embodiments are not limited to this configuration. The following description may be applied to the embodiment in which the pin  400  is separated from the moving unit  300 . 
     The second direction X2 may be a direction that is different from the first direction X1. According to the embodiment illustrated in  FIG. 7 , the second direction X2 may be perpendicular to the first direction X1. 
     Optionally, in order to prevent the pin  400  and/or the moving unit  300  from protruding outside the expression surface  100 , when the location of the information output apparatus is changed, for example, when the information output apparatus is turned over, while the power is not applied to the driving unit  200 , a separate device (not shown) may be placed between the pin  400  and the inside of the expression surface  100  and/or between the moving unit  300  and the inside of the expression surface  100 . The device may be an elastic member, and when the magnetic force of the driving unit  200  exceeds the elastic force of the elastic member, the pin  400  may protrude outside the expression surface  100 . This embodiment may be applied to any embodiment of the present specification. 
     Meanwhile, as shown in  FIG. 7 , a partition wall  500  may be placed between the driving unit  200  and the moving unit  300 , and the driving unit  200  and the moving unit  300  may be provided to be physically separated from each other by the partition wall  500 . As the driving unit  200  and the moving unit  300  are physically separated, the driving unit  200  may be sealed from moisture, and even when the moving unit  300  is in an environment exposed to moisture, this environment may not affect the driving unit  200 . 
       FIG. 8  is a cross-sectional view schematically showing an embodiment of the moving unit  300 . 
     The moving unit  300  may include a body  310  rotatably provided, and the body  310  may be provided as a circular plate as shown in  FIG. 8 . However, the present disclosure is not necessarily limited thereto, and the body  310  may be formed in various shapes capable of transmitting power to a pin as the body  310  rotates around the rotation axis  330 . 
     The body  310  of the moving unit  300  rotates around the rotation axis  330 , and the rotation axis  330  may be spaced apart from the center of the moving unit  300 , more specifically, the center  340  of the body  310 . Accordingly, when the body  310  rotates around the rotation axis  330 , an effect of moving in the second direction X2 as shown in the right image of  FIG. 8  may be obtained. As the body  310  rotates and moves in the second direction X2, this movement is transmitted to the pin  400 , and the pin  400  may also move in the second direction X2. 
     The moving unit  300  may include a magnetic member  320 . Optionally, the magnetic member  320  may also be arranged to be spaced apart from the center of the moving unit  300 , specifically, the center  340  of the body  310 . Accordingly, when the body  310  of the moving unit  300  rotates under the influence of the magnetic field by the coil of the driving unit  200 , it may be efficiently rotated with less force. 
     The magnetic member  320  may be embedded in the body  310 , and a permanent magnet may be used. However, embodiments of the present disclosure are not limited thereto, and a magnetic body in which a N pole  321  and a S pole  322  are formed along the second direction X2 may be used. 
     As shown in  FIG. 8 , a center of the magnetic member  320  may be disposed at the same position as the rotation axis  330  of the body  310 . However, embodiments are not limited thereto, and as in the embodiment illustrated in  FIG. 9 , the center of the magnetic member  320  may be spaced apart from the rotation axis  330  of the body  310 . As such, a rotation efficiency of the body  310  may be maximized by adjusting a positional relationship of the rotation axis  330  of the body  310  and the center of the magnetic member  320 . 
     Meanwhile, the rotation axis  330  of the body  310  may be formed in various shapes. 
     That is, as shown in  FIG. 10 , the rotation axis  330  may include a first rotation axis  331 . The first rotation axis  331  may be formed in a semicircle shape, and may include, for example, a straight portion  3311  extending along the second direction X2. The straight portion  3311  may be positioned close to a center of rotation. 
     According to another embodiment illustrated in  FIG. 11 , the rotation axis  330  may include a second rotation axis  332 . The second rotation axis  332  may be circular. 
     The body  310  may be mounted on a holder  350  shown in  FIG. 12 , the holder  350  may be formed as a box body, and the holder  350  may accommodate the body  310  therein, and may include a support groove  351  supporting the rotation axis  330  of the body  310 . The holder  350  may have sufficient space therein so that the body  310  may rotate while the rotation axis  330  is supported on the support groove  351 . 
     The support groove  351  may be formed in various shapes, and according to the embodiment illustrated in  FIG. 13 , the support groove  351  may include a first support groove  3511  provided in a circular shape. Accordingly, while the position of the rotation axis  330  mounted on the support groove  351  remains unchanged, the body may rotate. 
     According to another embodiment illustrated in  FIG. 13 , the support groove  351  may include a second support groove  3512 . The second support groove  3512  may be formed in a straight line. The second support groove  3512  may extend along the second direction X2. Accordingly, the position of the rotation axis  330  mounted on the second support groove  3512  may move along the second direction X2. As the position of the rotation axis  330  moves along the second direction X2, the body  310  may move along the second direction X2 while rotating, whereby the body  310  may move the pin  400  with only a small force. In addition, as the body  310  moves toward the pin  400  while rotating along the second direction X2, the pin  400  may be maintained in a fixed state even when the coil is blocked with electricity. 
     The straight shape may be provided in various shapes, and according to an embodiment illustrated in  FIG. 14 , the support groove  351  may include a third support groove  3513  provided in an inverted U shape. The third support groove  3513  may include a straight section  3514  and a curved section  3515 . Accordingly, while the body  310  rotates, the rotation axis  330  of the body  310  may be moved from the straight section  3514  to the other straight section through the curved section  3515 . Accordingly, in the state where the pin  400  is raised outside of the expression surface and the state where it is lowered inside of the expression surface, the distance between the magnetic member and the coil may be maintained constant, whereby the pin  400  may move with low power. 
     Various embodiments of the moving unit  300  as described above may be applied in combination to all embodiments of the present specification. 
     According to the embodiment illustrated in  FIG. 15 , the driving unit  200  may include a coil shaft  210  and a coil  220 . The coil shaft  210  may be extended in the second direction X2, and the coil  220  may be wound around the coil shaft  210 . Therefore, as the electrical signal is applied to the coil  220 , the coil  220  may form a magnetic field along the second direction X2. The magnetic field may change the polarity of the magnetic phase in the second direction X2 according to the type of the electrical signal, and, as the magnetic member  320  reacts to the change in the magnetic polarity, the body  310  may rotate around the rotation axis  330 . 
     In the case of the embodiment illustrated in  FIG. 15 , the coil  220  may be wound over the entire length of the coil shaft  210 . However, embodiments are not limited thereto, and the coil  220  may be wound only on a part of the coil shaft  210 . The coil shaft  210  may include a plastic material, but embodiments of the present disclosure are not limited thereto. In an embodiment, the coil shaft  210  may include a magnetic material such as metal. Accordingly, even when the application of electricity to the coil  220  is stopped, the magnetism may be maintained in the coil shaft  210  for a period of time. 
     According to another embodiment illustrated in  FIG. 16 , the driving unit  200  may further include a support  230  protruding toward the moving unit  300 . The support  230  may be coupled to the coil shaft  210  and may extend in the second direction X2, and when the coil shaft  210  includes a magnetic material, the coil shaft  210  and the support  230  may be integrally formed. However, embodiments are not limited thereto, and only the coil shaft  210  includes a magnetic material, and the support  230  may include a non-magnetic material. 
     According to the embodiment illustrated in  FIG. 16 , the body  310  may include a receiving portion  311  in which the magnet member  320  is accommodated, and the receiving portion  311  may be formed to be spaced inwardly from the outer edge of the body  310 . In addition, the support  230  may be provided to protrude up to the inside of the body  310  and extend to a position adjacent to the receiving portion  311 . For example, as shown in  FIG. 17 , the receiving portion  311  is provided between a pair of body  310 , so that, even when the support  230  is drawn to the inside of the body  310 , the rotating of the body  310  may not interfere with the support  230 . In this case, the holder  350  allows the body  310  to rotate sufficiently in the inner space portion  352 . Thus, as the support  230  protrudes to the inside of the body  310  and extends to a position adjacent to the receiving portion  311 , when the body  310  rotates, the support  230  supports the body  310  (for example, the receiving portion  311 ), whereby the body  310  may be stably rotated. 
     As the support  230  extends long, the distance between the support  230  and the magnetic member  330  may be maintained close. When the support  230  includes a magnetic material, the support  230  has a certain polarity due to the magnetic force formed by the coil  220 . Accordingly, even a small magnetic force may affect the magnetic member  330  more effectively. Therefore, it is possible to enable low-power driving. In addition, even in the case in which the electricity applied to the coil  220  is cut off, the support  230  may retain magnetism. Accordingly, the body  310  may maintain a fixed state without being reversed again even in a state as shown in the right figure of  FIG. 16 . Thus, the pin  400  may continue to protrude even when the power is not applied. Therefore, it is not necessary to continuously apply electricity to the coil  220  to keep the pin  400  protruding. This may lower the operating power and/or power consumption of the entire apparatus. 
     Meanwhile, as shown in  FIG. 18 , a magnetic material  420  may be further formed on the pin  400 . The magnetic material  420  may be formed in a plate shape or a shape having a volume. In addition, although not shown in the drawings, the magnetic material may be coated in a film shape on the pin  400 , or may be mixed when the pin  400  is formed. 
     As described above, since the pin  400  includes the magnetic material  420 , the pin  400  may be prevented from protruding outside of the expression surface even when power is not applied. When the pin  400  protrudes to the outside of the expression surface and then is driven down to the inside of the expression surface again, the pin  400  may be driven down more easily by the magnetic force of the magnetic material  420  and the magnetic member  320  as well as the movement by the weight of the pin  400 . 
     In this way, since the pin is easily driven down and the protrusion of the pin is prevented without applying power, low-power driving of the entire apparatus becomes possible. 
       FIG. 19 a    to  FIG. 20 b    are transparent views schematically showing an information output unit according to another embodiment of the disclosure.  FIGS. 19A and 19B  show sectional views of the information output unit in a pin down state, and  20 A and  20 B show sectional views of the information output unit in a pin up state. 
     Referring to  FIG. 19 a    to  FIG. 20 b   , the information output unit IU may comprise a coil  50 , a lower housing  31 , a middle housing  30 , an upper housing  32 , a driving unit  20 , and a pin  10 . 
     The pin  10  may be moved according to movement of the driving unit  20 , that is, may be moved at least in upper and lower directions based on a lengthwise direction thereof. 
     The pin  10  may include various materials, for example, an insulating material that is light-weight and has an excellent durability. For example, the pin  10  may include a resin-based organic material. In another example, the pin  10  may include an inorganic material such as a ceramic material. 
     Also, in another alternative embodiment, the pin  10  may include a material such as metal or glass. 
     The pin  10  may include a magnetic body  10   a  therein. The pin  10  may be driven through the driving unit  20  more efficiently by using the magnetic body  10   a  of the pin  10 , and the power consumption may be reduced. 
     For example, the magnetic body  10   a  may include a metal, and may include iron as a specific example. 
     As an alternative embodiment a little magnetic force may be generated between the magnetic body  10   a  and the magnet  20   a  inside the driving unit  20 , and as a specific example, the pin  10  easily descends when the driving unit  20  descends. It is not preferable that such mutual magnetic forces are large enough to limit the motion of the driving unit  20 . 
     For example, it is not desirable that such mutual magnetic force is large enough to maintain the rising position or the falling position of the pin  10 . 
     In addition, the pin  10  may easily descend when the driving unit  20  descends through the weight of the magnetic body  10   a.    
     The coil  50  may be electrically connected to the terminals  710  of the control plate  700  (referring to  FIG. 3 ) through terminals  33   a  located at a bottom of the lower housing  31 . When an electric current flows through the coil  50 , a magnetic field may be generated around the coil  50  and/or a core  40 . 
     The driving unit  20  may be moved via the electro-magnetic field generated due to the electric current flowing through the coil  50 , and a driving force for moving the pin  10  may be provided through the movement of the driving unit  20 . 
     In an alternative embodiment, the core  40  may be further provided, and the coil  50  may be wound around the core  40  and penetrate the lower housing  31  and middle housing  30 . 
     In an alternative embodiment, the core  40  may include a magnetic body, as such, a magnitude of the magnetic field may increase when the magnetic field is generated by the coil  50 , and the magnetic field generation may be effectively performed to reduce power consumption of the information output unit IU. 
     The core  40  may comprise a metal, for example a ferrous material. In an alternative embodiment, the core  40  may comprise nickel and/or cobalt. 
     In an alternative embodiment, the lower housing  31  and the upper housing  32  may be divided and/or apart from each other. 
     In another alternative embodiment, the lower housing  31  and the middle housing  30  may be connected to each other via a through hole. 
     The coil  50  may be arranged in the lower housing  31 . In an alternative embodiment, the core  40  may be arranged in the lower housing  31 , and a portion of the core  40  may extend into the middle housing  30  via the through hole. 
     In an alternative embodiment, the housing may include the middle housing  30  between the lower housing  31  and the upper housing  32 . 
     The lower housing  31  and the upper housing  32  may be separated from each other by the middle housing  30 . 
     In an alternative embodiment, the middle housing  30  may have a through hole, through which a portion of the core  40  may extend and pass. 
     Also, the upper housing  32  includes an entry unit  32   a . The pin  10  may move through the entry unit  32   a  such that a length of the portion protruding out of the upper housing  32  may change. 
     The driving unit  20  may be arranged in the upper housing  32  and the middle housing  30 . The driving unit  20  may be separated from the coil  50  that is in the lower housing  31 . 
     The driving unit  20  is arranged adjacent to the coil  50  and is driven by the electric current flowing through the coil  50  to perform an angular movement or a rotational movement. 
     In an alternative embodiment, a magnet  20   a  may be arranged in the driving unit  20 , for example, in an internal space of the driving unit  20 . For example, the magnet  20   a  may include a magnetic material, for example, a permanent magnet. 
     The magnet  20   a  may include a first region (e.g., N-pole or S-pole) and a second region (e.g., S-pole or N-pole) having different polarities from each other, and the first region and the second region having the different polarities from each other may be arranged in a Z-axis direction. The magnet  20   a  is inclined in a predetermined range, so as to provide the driving unit  20  with a rotation torque. As such, the driving unit  20  is easily rotated if the rotation of the driving unit  20  is started. 
     The driving unit  20  includes the driving surface  20   e  on at least an outer surface thereof, and the driving surface  20   e  is formed to support the pin  10  and provides a driving force to the up-and-down movement of the pin  10 . 
     In an alternative embodiment, the driving surface  20   e  of the driving unit  20  is an outer surface that may include a curved surface. In more detail, the driving surface  20   e  of the driving unit  20  may include a boundary line that is formed similarly to a circle. 
     The driving unit  20  may include a driving controller  20   f.    
     A location of driving the driving unit  20  may be controlled by the driving controller  20   f . For example, when the driving unit  20  is moved by the coil  50 , the driving unit  20  may perform an angular or rotational movement about the driving controller  20   f.    
     In an alternative embodiment, a central axis of the driving unit  20  and the driving controller  20   f  may not be coincident, but may be eccentric with respect to each other. 
     In addition, in an alternative embodiment, the magnet  20   a  does not coincide with the central axis of the driving unit  20 , and may be arranged, for example, to overlap a region of the driving unit  20 . 
     As such, a torque force with respect to the driving unit  20  may be easily generated and allows the driving unit  20  to perform an angular or rotational movement such that a movement relative to the pin  10  may be performed effectively and a precise expression of the information output unit IU may be improved. Also, power consumption of the information output unit IU may be reduced. 
     For example, during the angular movement of the driving unit  20 , once a force is applied only until the driving unit  20  reaches the critical point, the angular movement may be additionally performed even without additional force applied after that point. 
     The driving controller  20   f  may be arranged on at least one side surface of the driving unit  20 , for example, on each of opposite side surfaces. 
     In an alternative embodiment, the driving controller  20   f  may protrude, and the protruding shape of the driving controller  20   f  in the alternative embodiment may correspond to a driving groove of the upper housing  32 . 
     In the above embodiment, the driving unit  20  retaining the magnet  20   a  rotates about the rotation shaft (driving controller)  20   f  in order to transition between the pin down and pin up states. 
     In the pin  10  down state: The pin down flat stop surface  20   c  of the retainer portion  20   b  and the flat stop surface  30   a  of the middle housing  30  contact each other and the stopping state of the driving unit  20  is held. 
     In an alternative embodiment, no current may be applied to the coil  50  and/or no substantial amount of magnetic force is applied between the magnet  20   a  and the core  40  in the pin down state. 
     And then current is applied to the coil  50  to make the core  40  and/or the coil  50  be an electromagnet. The electromagnet causes repulsive force between the core  40  and/or the coil  50  and the magnet  20   a  of the driving unit  20  such that the magnet  20   a  rotates about the driving controller (shaft)  20   f  in a counterclockwise direction until the flat stop surface  20   d  of the retainer portion  20   b  contacts the flat stop surface  30   a  of the middle housing  30 , which causes the driving unit  20  to stop the rotation. 
     While the driving unit  20  rotates, the driving surface  20   e  moves the pin  10  up. 
     In an alternative embodiment, the current applied the coil  50  may not be changed during the rotation of the driving unit  20 . 
     In the pin  10  up state: The flat stop surface  20   d  of the retainer portion  20   b  and the flat stop surface  30   a  of the middle housing  30  contact each other and the stopping state of the driving unit  20  is held. 
     In an alternative embodiment, no current is applied to the coil  50  in the pin  10  up state, and/or no substantial amount of magnetic force is applied between the magnet  20   a  and the core  40  in the pin  10  up state. 
     And then current is applied to the coil  50  to make the core  40  and/or the coil  50  be an electromagnet, and the electromagnet causes repulsive force between the core  40  and/or the coil  50  and the magnet  20   a  such that the magnet  20   a  rotates about the driving controller (shaft)  20   f  in a clockwise direction until the flat stop surface  20   c  of the retainer portion  20   b  contacts the flat stop surface  30   a  of the middle housing  30 , which causes the driving unit  20  to stop the rotation. 
     While the driving unit  20  rotates, the pin  10  moves down along the cam shape profile of the driving surface  20   e.    
     In an alternative embodiment, the current applied the coil  50  may not be changed during the rotation of the driving unit  20 . 
     The above embodiment operates in the pin down state in such a way that the driving unit  20  is held in place by a mechanical structure, i.e., a physical contact between the flat stop surface  20   c  of the driving unit  20  and the flat stop surface  30   a  of the middle housing  30 . In the pin up state, the driving unit  20  is held in place by the physical contact between the flat stop surface  20   d  of the driving unit  20  and the flat stop surface  30   a  of the middle housing  30 . Thus, magnetic force for holding the permanent magnet  20   a  at a position in each of the pin down state or the pin up state is not required as the flat stop surfaces  20   c  or  20   d  and  30   a  mechanically hold the driving unit  20  in the pin down state and the pin up state. 
     Further, in the pin down state and the pin up state, no current may be applied, no electromagnetic force may be generated, and/or no substantial amount of the magnetic force exists between the magnet  20   a  and the any other elements for holding the magnet  20   a  in place. 
       FIG. 21  is a perspective view schematically illustrating an information output apparatus according to an embodiment of the present disclosure, and  FIG. 22  is an exploded perspective view illustrating the information output apparatus of  FIG. 21 . 
     Referring to  FIGS. 21 and 22 , an information output apparatus  1000  according to the embodiment may include an upper unit  1100 , a lower unit  1200 , and a base unit  1300 . 
     First, referring to  FIG. 21 , the upper unit  1100 , the lower unit  1200 , and the base unit  1300  may maintain a state in which they are coupled to each other. 
     In addition, referring to  FIG. 22 , the upper unit  1100 , the lower unit  1200 , and the base unit  1300  of the information output apparatus  1000  according to the embodiment may maintain a state in which they are not coupled to each other. Accordingly, convenience of maintenance of the information output apparatus  1000 , such as repair or replacement, may be improved. 
     The upper unit  1100 , the lower unit  1200 , and the base unit  1300  of the information output apparatus  1000  may be coupled to or separated from each other by using various methods without any separate fastening or coupling member therebetween, and each of them may be easily separated by applying a force to the upper unit  1100 , the lower unit  1200 , or the base unit  1300  of the information output apparatus  1000 , for example, by pushing or pulling at least one region thereof. 
     The upper unit  1100  may be formed to accommodate one or more expression units  1110 , each of which may move up to protrude through an expression through hole  1100 TH formed on one region of the top surface  1101  of the upper unit  1100  and move reversely down. The expression unit  1110  may move up and down to allow a user to sense the expression unit  1110 , and for example, the user may sense an expression surface  1111  of the expression unit  1110  through tactile sensation, and thus, information interactions such as information recognition or information input by the user may be performed. In an alternative embodiment, the user may visually sense the expression unit  1110 . 
     In an alternative embodiment, the upper unit  1100  may accommodate a plurality of expression units  1110 , and for example, as illustrated in  FIGS. 21 and 22 , the upper unit  1100  may accommodate eight expression units  1110 , which may be arranged to be distinguished from each other. The eight expression units  1110  may move independently or simultaneously to perform output or input of a variety of information. 
     In an alternative embodiment, a plurality of information output apparatuses  1000  may be arranged. 
     For example, two or more information output apparatuses  1000  may be arranged in parallel in the X-axis direction of  FIGS. 21 and 22 , and as another example, two or more information output apparatuses  1000  may be arranged in parallel in the Y-axis direction of  FIGS. 21 and 22 . 
     The lower unit  1200  may be connected to the upper unit  1100 . In addition, the lower unit  1200  may be provided with a driving force providing unit capable of providing a driving force to the expression unit  1110  such that the expression unit  1110  moves, for example, up or down. For example, as illustrated in  FIG. 22 , eight driving support units  1070  and coil units (not shown) may be provided to correspond to the eight expression units  1110 . 
     The lower unit  1200  may include a top surface  1201  facing the upper unit  1100 , and the top surface  1201  of the lower unit  1200  may correspond to the bottom surface of the upper unit  1100 . The bottom surface of the upper unit  1100  may be opposite to the top surface  1101  of the upper unit  1100 . 
     The upper unit  1100  and the lower unit  1200  may be coupled to each other by using grooves and extension units corresponding thereto. 
     For example, the upper unit  1100  may include a groove unit  1120 , and a first groove  1121  and a second groove  1122  of the groove unit  1120  may correspond to a first extension unit  1221  and a second extension unit  1222  of an extension unit  1220  of the lower unit  1200 , respectively. In an alternative embodiment, a step is be formed in each of the first groove  1121  and the second groove  1122  of the groove unit  1120 , and a locking unit is formed on each of the first extension unit  1221  and the second extension unit  1222  of the extension unit  1220 , such that a stable coupling force may be maintained after coupling them with each other by applying a force thereto, and the step and the locking unit may be easily separated from each other by applying a sufficient force thereto in the opposite direction. Their detail descriptions will be provided below. 
     In an alternative embodiment, the upper unit  1100  may include an upper protrusion  1130  formed to face the lower unit  1200 , and the upper protrusion  1130  may include a first upper protrusion member  1131  and a second upper protrusion member (not shown). 
     The lower unit  1200  may include a lower groove  1230  corresponding to the upper protrusion  1130 , and in detail, the lower unit  1200  may include a first lower groove  1231  and a second lower groove  1232 . 
     The first upper protrusion member  1131  and the second upper protrusion member (not shown) may correspond to and be inserted into the first lower groove  1231  and the second lower groove  1232 , respectively. In this case, the first upper protrusion member  1131  and the second upper protrusion member (not shown) may be formed to be shorter than the first lower groove  1231  and the second lower groove  1232 , such that a first base protrusion member  1331  and a second base protrusion member  1332  of a base protrusion  1330  of the base unit  1300  may correspond to the remaining spaces of the first lower groove  1231  and the second lower groove  1232 , respectively. 
     The lower unit  1200  may be connected to the base unit  1300 . For example, the lower unit  1200  may be arranged between the upper unit  1100  and the base unit  1300 . In detail, the lower unit  1200  may be connected to the upper unit  1100  and the base unit  1300 , and in an alternative embodiment, the lower unit  1200  may be detachably coupled to the upper unit  1100  and the base unit  1300 . 
     Accordingly, as illustrated in  FIG. 21 , the information output apparatus  1000  according to the embodiment may have a shape similar to a structure in which three layers are stacked, or may have a shape similar to the outer surface of a box. 
     In an alternative embodiment, the base unit  1300  may include the base protrusion  1330  formed to face the lower unit  1200 , and the base protrusion  1330  may include the first base protrusion member  1331  and the second base protrusion member  1332 . 
     The first base protrusion member  1331  and the second base protrusion member  1332  of the base protrusion  1330  of the base unit  1300  may correspond to the first lower groove  1231  and the second lower groove  1232  of the lower groove  1230  of the lower unit  1200 . For example, they may be arranged to be inserted into one another. 
     In an alternative embodiment, the base unit  1300  may include a base extension unit  1340  formed to face the lower unit  1200 , and a lower corresponding unit  1240  corresponding to the base extension unit  1340 , for example, a first lower corresponding member  1241  and a second lower corresponding member  1242 , may be formed on one surface of the lower unit  1200 . 
     A first base extension member  1341  of the base extension unit  1340  may correspond to the first lower corresponding member  1241 , and may have elasticity to, when a force is applied thereto, be away from the outer surface of the base unit  1300 , to firmly correspond to the first lower corresponding member  1241 . In addition, the first lower corresponding member  1241  may be in the shape of a groove and have a locking region such as a step formed therein, to allow the first base extension member  1341  to be stably arranged therein. 
     The base unit  1300  may have a hollow shape so as to have a space portion  1300 S at least inside thereof, or, in an alternative embodiment, may have a shape in which an upper portion and a lower portion thereof are opened. 
     At least a signal connection unit CF may be arranged in the space portion  1300 S. The signal connection unit CF is connected to the driving force providing unit accommodated in the lower unit  1200 , and for example, may be arranged to apply a signal to a coil unit (not shown) around the driving support unit  1070 . 
     In an alternative embodiment, the signal connection unit CF may contain a flexible material and thus be bendable. 
     In an alternative embodiment, the signal connection unit CF may be connected to a circuit controller CP. One or more signals may be applied to the driving force providing unit through the circuit controller CP. 
     As described above, a plurality of information output apparatuses  1000  according to the embodiment may be arranged in one or more directions (the X-axis or Y-axis direction). In this case, the plurality of information output apparatuses  1000  may be connected or coupled to each other. 
     In an alternative embodiment, they may be connected to each other through the base unit  1300 . 
     The base unit  1300  may include one or more connection protrusion members  1360 C,  1361 A,  1362 A, and  1363 A and one or more connection grooves  1360 D,  1361 B,  1362 B, and  1363 B. 
     The connection protrusion members  1360 C,  1361 A,  1362 A, and  1363 A and the connection grooves  1360 D,  1361 B,  1362 B, and  1363 B of the base unit  1300  may correspond to and be connected or coupled to the connection grooves  1360 D,  1361 B,  1362 B, and  1363 B and the connection protrusion members  1363 A,  1363 B, and  1363 C of the adjacent base unit  1300 , respectively. 
     Each of the upper unit  1100 , the lower unit  1200 , and the base unit  1300  will be described in more detail with reference to the drawings. 
       FIGS. 23 to 26  are diagrams for describing the upper unit according to an embodiment of the present disclosure. 
     For example,  FIG. 23  is a perspective view of the upper unit  1100  of the information output apparatus  1000  of  FIG. 21  seen from one direction,  FIG. 24  is a perspective view of the upper unit  1100  of  FIG. 23  seen from a different direction,  FIG. 25  is a side view of the upper unit  1100  of  FIG. 23  seen from one side, and  FIG. 26  is a plan view of the upper unit  1100  of  FIG. 23  seen from the top. 
     The upper unit  1100  may be formed to accommodate one or more (e.g., eight) expression units  1110 , each of which may move upward to protrude through the expression through hole  1100 TH formed on one region of the top surface  1101  of the upper unit  1100  and move reversely downward. The top surface  1101  may include a flat surface to allow the user to precisely sense the expression unit  1110  with his/her finger. 
     The upper unit  1100  may have one or more grooves, for example, grooves for connection with the lower unit  1200 . 
     For example, the upper unit  1100  may include the groove unit  1120 , which may include one or more grooves, i.e., the first groove  1121  and the second groove  1122 . 
     The first groove  1121  and the second groove  1122  may be arranged on opposite side surfaces of the upper unit  1100 , and in an alternative embodiment, may be arranged to be opposite to each other in the lengthwise direction (e.g., the X-axis direction of  FIG. 23 ) when the width of the upper unit  1100  is defined to be less than the length of the upper unit  1100 . In addition, the first groove  1121  and the second groove  1122  may be formed at smaller side surfaces among the side surfaces of the upper unit  1100  to face each other, and accordingly, a force by the user to couple or separate the upper unit  1100  and the lower unit  1200  to or from each other may be effectively applied to facilitate the coupling or separation. 
     In an alternative embodiment, the first groove  1121  and the second groove  1122  may be formed at overlapping positions, for example, may be formed in parallel along the lengthwise direction of the upper unit  1100 . 
     The first groove  1121  and the second groove  1122  may include a first step  1121 P and a second step  1122 P, respectively. The first step  1121 P and the second step  1122 P in the first groove  1121  and the second groove  1122  are curved along the thickness direction of the upper unit  1100  (e.g., the Z-axis direction of  FIG. 23 ) such that the thickness thereof decreases in the downward direction. Locking units may be formed on the first extension unit  1221  and the second extension unit  1222  of the extension unit  1220  of the lower unit  1200  to correspond to the first step  1121 P and the second step  1122 P of the upper unit  1100 , respectively. 
     In an alternative embodiment, the first groove  1121  and the second groove  1122  may include a first curved surface (not shown) and a second step  1122 C, respectively. For example, the first curved surface (not shown) and the second step  1122 C may correspond to the first groove  1121  and the second groove  1122 , respectively, and may be arranged closer to the lower unit  1200  than the first step  1121 P and the second step  1122 P, respectively. Through the first curved surface (not shown) and the second step  1122 C, each of the first groove  1121  and the second groove  1122  may have a curved inner surface in a region adjacent to the lower unit  1200 , and may include a region deeper than adjacent regions according to the shape of the curved inner surface. Accordingly, the lower unit  1200  and the upper unit  1100  may be smoothly connected to each other, and for example, the first extension unit  1221  and the second extension unit  1222  of the extension unit  1220  of the lower unit  1200  may be arranged to easily correspond to the first groove  1121  and the second groove  1122 , respectively, and the lower unit  1200  and the upper unit  1100  may be easily separated from each other by simply forcing the first extension unit  1221  and the second extension unit  1222  outward. 
     In an alternative embodiment, the upper unit  1100  may include the upper protrusion  1130  formed to face the lower unit  1200 , and the upper protrusion  1130  may include the first upper protrusion member  1131  and the second upper protrusion member  1132 . 
     The first upper protrusion member  1131  and the second upper protrusion member  1132  may be arranged not in parallel with respect to the widthwise direction of the upper unit  1100 . 
     The first upper protrusion member  1131  and the second upper protrusion member  1132  may have various shapes, and each may protrude from the bottom surface of the upper unit  1100  and may include an outer surface extending from a side surface of the upper unit  1100 . 
     In addition, the first upper protrusion member  1131  and the second upper protrusion member  1132  may include regions having different widths, along the lengthwise direction, for example, the direction toward the lower unit  1200 . 
     For example, the first upper protrusion member  1131  may include a first protrusion main region  1131 M and a first protrusion lower region  1131 N, which is connected to the first protrusion main region  1131 M and is farther away from the top surface  1101  of the upper unit  1100  than the first protrusion main region  1131 M. The first protrusion lower region  1131 N may include a region having a width less than that of the first protrusion main region  1131 M. 
     For example, the second upper protrusion member  1132  may include a second protrusion main region  1132 M and a second protrusion lower region  1132 N, which is connected to the second protrusion main region  1132 M and is farther away from the top surface  1101  of the upper unit  1100  than the second protrusion main region  1132 M. The second protrusion lower region  1132 N may include a region having a width less than that of the second protrusion main region  1132 M. 
     The first upper protrusion member  1131  and the second upper protrusion member  1132  may correspond to the first lower groove  1231  and the second lower groove  1232  of the lower groove  1230  of the lower unit  1200 , respectively, and the first upper protrusion member  1131  and the second upper protrusion member  1132  may be easily accommodated in the first lower groove  1231  and the second lower groove  1232  of the lower groove  1230  of the lower unit  1200 , respectively, through the first protrusion lower region  1131 N and the second protrusion lower region  1132 N, which have a small width. 
       FIGS. 27 to 31  are diagrams for describing the lower unit according to an embodiment of the present disclosure. 
     For example,  FIG. 27  is a perspective view of the lower unit  1200  of the information output apparatus  1000  of  FIG. 21  seen from one direction, and  FIG. 28  is a perspective view of the lower unit  1200  of  FIG. 27 , without the driving support unit  1070 , the signal connection unit CF, and the circuit controller CP, seen from a different direction. 
       FIG. 29  is a perspective view of the lower unit  1200  of  FIG. 28  seen from the bottom,  FIG. 30  is a plan view of the lower unit  1200  of  FIG. 28  seen from the top, and  FIG. 31  is a side view of the lower portion of  FIG. 28  seen from one direction. 
     As illustrated in  FIG. 27 , the lower unit  1200  may accommodate one or more driving support units  1070  and coil units (not shown) for driving the expression units  1110 , for example, eight driving support units  1070  and coil units (not shown) corresponding to eight expression units  1110 . The driving force providing unit including the driving support unit  1070  and the coil unit (not shown) will be described in detail below. 
     The lower unit  1200  may be handled together with the driving force providing unit accommodated therein, and they may be integrally managed to perform a separation or coupling process for replacement. For example, eight driving support units  1070  and coil units (not shown) may be connected to or separated from the upper unit  1100  or the base unit  1300 , in a state in which they are accommodated in the lower unit  1200 . In an alternative embodiment, the signal connection unit CF and the circuit controller CP may also be provided in the lower unit  1200 , and for example, may be directly or indirectly connected to the driving support units  1070  and the coil units (not shown), and thus be handled together with the lower unit  1200 . 
     The lower unit  1200  may include the top surface  1201  facing the upper unit  1100 , and the top surface  1201  of the lower unit  1200  may correspond to the bottom surface of the upper unit  1100 . The bottom surface of the upper unit  1100  may be opposite to the top surface  1101  of the upper unit  1100 . 
     The lower unit  1200  may include outer surfaces, for example, four side surfaces to have the shape of a box. 
     In an alternative embodiment, like the lower unit  1200 , each of the upper unit  1100  and the base unit  1300  may also include four side surfaces to have the shape of a box, and for example, the side surfaces of the upper unit  1100 , the lower unit  1200 , and the base unit  1300  may include regions parallel with each other. 
     The lower unit  1200  may include one or more extension units corresponding to the groove unit  1120  of the upper unit  1100 , and for example, the extension unit  1220  of the lower unit  1200  may include the first extension unit  1221  and the second extension unit  1222 . 
     The first extension unit  1221  and the second extension unit  1222  of the extension unit  1220  may correspond to the first groove  1121  and the second groove  1122  of the groove unit  1120  of the upper unit  1100 . 
     The first extension unit  1221  and the second extension unit  1222  may include a first locking unit  1221 P and a second locking unit  1222 P, respectively. The first extension unit  1221  and the second extension unit  1222  may protrude and extend from the top surface  1201  of the lower unit  1200 , and the first locking unit  1221 P and the second locking unit  1222 P may be formed on the first extension unit  1221  and the second extension unit  1222 , respectively, to be spaced apart from the top surface  1201 . 
     For example, the first locking unit  1221 P and the second locking unit  1222 P may correspond to the first step  1121 P and the second step  1122 P formed in the first groove  1121  and the second groove  1122  of the upper unit  1100 , respectively. 
     Accordingly, in a state in which the upper unit  1100  and the lower unit  1200  are separated from each other, by applying a force to the upper unit  1100  in the direction toward the lower unit  1200 , the first extension unit  1221  and the second extension unit  1222  are accommodated in the first groove  1121  and the second groove  1122 , respectively, and the first locking unit  1221 P and the second locking unit  1222 P are locked with the first step  1121 P and the second step  1122 P, respectively, to maintain a coupled state. 
     In addition, in a state in which the upper unit  1100  and the lower unit  1200  are coupled to each other, by applying a force to the first extension unit  1221  and the second extension unit  1222  to force them outward, the first locking unit  1221 P and the second locking unit  1222 P are released from the first step  1121 P and the second step  1122 P, respectively, and thus the upper unit  1100  is easily separated from the lower unit  1200 , for example, by lifting the upper unit  1100  up from the lower unit  1200 . 
     The top surfaces of the first extension unit  1221  and the second extension unit  1222 , for example, the top surfaces of the first step  1121 P and the second step  1122 P, may include an inclined surface or a curved surface, thereby facilitating the separation. 
     In an alternative embodiment, the lower unit  1200  may include the lower groove  1230  corresponding to the upper protrusion  1130  of the upper unit  1100 , and in detail, may include a first lower groove  1231  and a second lower groove  1232 . 
     In an alternative embodiment, the first lower groove  1231  and the second lower groove  1232  may have curved inner surfaces to allow the first upper protrusion member  1131  and the second upper protrusion member  1132  of the upper unit  1100  to be easily accommodated therein. 
     In an alternative embodiment, in the lower unit  1200 , the lower corresponding unit  1240 , for example, a first lower corresponding member  1241  and a second lower corresponding member  1242 , corresponding to the base extension unit  1340  may be formed. 
     The first lower groove  1231  and the first lower corresponding member  1241  may be formed on one side surface of the lower unit  1200 , and the second lower groove  1232  and the second lower corresponding member  1242  may be formed on the opposite side surface. 
     Accordingly, structures for connection with the upper unit  1100  and the base unit  1300  may be formed on one side surface of the lower unit  1200 , and structures for connection with upper unit  1100  and the base unit  1300  may be formed on the opposite side surface, so as to improve the connection and coupling forces with the upper unit  1100  and the base unit  1300 . 
     In an alternative embodiment, the first lower groove  1231  may be formed to overlap the second lower corresponding member  1242 , and the second lower groove  1232  may be formed to overlap the first lower corresponding member  1241 , with respect to the widthwise direction of the lower unit  1200 . Accordingly, uniformity in connecting or coupling the upper unit  1100  and the base unit  1300  to the lower unit  1200  may be secured. 
     The first lower corresponding member  1241  and the second lower corresponding member  1242  may be in the shape of a groove, and may have, for example, an inner side surface having an angled cross section. In addition, the first lower corresponding member  1241  and the second lower corresponding member  1242  may have a step region protruding from one region of the inner side surface having the shape of a groove. Accordingly, the first base extension member  1341  and a second base extension member  1342  of the base unit  1300  may be stably accommodated therein. 
     In an alternative embodiment, the lower unit  1200  may include one or more convex portions  1202  formed on the top surface  1201 , and the upper unit  1100  may include concave portions (not shown) corresponding to the convex portions  1202  of the lower unit  1200 . Accordingly, when the upper unit  1100  is connected or coupled to the lower unit  1200 , misalignment of the positions of the upper unit  1100  and the lower unit  1200  may be alleviated or prevented. 
     In an alternative embodiment, the lower unit  1200  may include penetration portions  1250  corresponding to eight driving support units  1070 . Accordingly, one region of an upper portion of each of the eight driving support units  1070  may be exposed through the corresponding penetration portion  1250 . 
     In an alternative embodiment, a region including the penetration portion  1250  of the lower unit  1200  may include a protrusion region  1251 , and thus a region for arranging a moving member (not shown) or other members corresponding to the driving support unit  1070  in the upper unit  1100  may be easily implemented. 
     The lower unit  1200  may include one or more accommodation units  1260 , for example, eight accommodation units  1260 , to which the eight driving support units  1070  and the coil units (not shown) correspond, respectively, and the eight accommodation units  1260  may be connected to the penetration portions  1250 , respectively. 
     In an alternative embodiment, a barrier unit  1270  may be formed to divide the eight accommodation units  1260 . 
     In another alternative embodiment, the accommodation units  1260  may be formed to be connected to each other without the barrier unit  1270 . 
       FIG. 32  is an exemplary diagram for describing driving support units and coil units accommodated in a lower unit, according to an embodiment of the present disclosure, and  FIG. 33  is a cross-sectional view taken along line XIII-XIII of  FIG. 32 .  FIG. 34  is a diagram illustrating a modification of the driving support unit and the coil unit of  FIG. 33 . 
     Referring to  FIG. 32 , eight driving support units  1070  and eight coil units  1020  are arranged. 
     The coil unit  1020  may be arranged around the driving support unit  1070 , and for example, the coil unit  1020  may be wound around the driving support unit  1070 . 
     When an electric field is applied to the coil unit  1020 , an electric current may flow through the coil unit  1020  and a magnetic field may be generated around the coil unit  1020 . By the magnetic field, a driving force may be provided such that the expression unit  1110  ascends to protrude, or descends in the opposite direction. 
     The driving support unit  1070  may include an elongated region and may be arranged to pass through the coil unit  1020 . 
     In an alternative embodiment, the driving support unit  1070  may include a magnetic body, and in detail, the entire driving support unit  1070  or one region of the upper end thereof may include the magnetic body. Accordingly, the magnitude of a magnetic field generated through the coil unit  1020  may increase, and the magnetic field may be efficiently generated to improve the efficiency of providing a driving force for a movement of the expression unit  1110 . 
     In addition, in an alternative embodiment, the driving support unit  1070  may include metal. For example, the driving support unit  1070  may include iron. As another example, the driving support unit  1070  may include nickel or cobalt. 
     In an alternative embodiment, a pedestal unit  1010  may be arranged below the driving support unit  1070 . 
     In an alternative embodiment, the signal connection unit CF may be provided, and a signal may be applied to the coil units  1020  through the signal connection unit CF. For example, one or more signals from the circuit controller CP may be applied to the coil units  1020  through the signal connection unit CF, and in detail, signals may be respectively applied to the eight coil units  1020  corresponding to the eight driving support units  1070 , and as another example, the same signal may be simultaneously applied to the eight coil units  1020 . 
     In an alternative embodiment, a circuit board HUB may be further provided to connect the signal connection unit CF to the eight coil units  1020 . 
     The signal connection unit CF may have various shapes, for example, may be formed of a flexible material to be bendable at least once, and thus may be folded twice as illustrated in  FIG. 32 , so as to improve the overall space utilization of the information output apparatus  1000 . 
     In an alternative embodiment, referring to  FIG. 33 , the driving support unit  1070  may have a plate-like wide support region formed at a lower portion of an elongated region, so as to facilitate the arrangement of the coil unit  1020 . 
     Referring to  FIG. 34 , in an alternative embodiment, an outer member  1090  may be further provided on the outer surface of the coil unit  1020 . The outer member  1090  may have various shapes, for example, the shape of a hollow pillar surrounding the coil unit  1020 , in detail, a cylindrical shape. 
     Through the outer member  1090 , interference between the surrounding space and a magnetic field generated through the coil unit  1020  may be alleviated or prevented. 
     The outer member  1090  may be formed of various materials, and may contain a magnetic body, for example, iron, nickel, or other various metallic magnetic materials. 
       FIGS. 35 to 37  are diagrams for describing the base unit according to an embodiment of the present disclosure. For example,  FIG. 35  is a perspective view of the base unit  1300  of the information output apparatus  1000  of  FIG. 21  seen from one direction,  FIG. 36  is a plan view of the base unit  1300  of  FIG. 35  seen from T, and  FIG. 37  is a perspective view of the base unit  1300  of  FIG. 35  seen from a different direction. 
     The base unit  1300  may be formed to be connectable to the lower unit  1200 . 
     The base unit  1300  may have a hollow shape so as to have the space portion  1300 S at least inside thereof, or, in an alternative embodiment, may have a shape in which an upper portion and a lower portion thereof are opened. 
     For example, the base unit  1300  may include a first side surface  1300 A, a second side surface  1300 B, a third side surface  1300 C, and a fourth side surface  1300 D, and the space portion  1300 S may be formed to be surrounded by them. The first side surface  1300 A may face the second side surface  13008 , and the third side surface  1300 C may face the fourth side surface  1300 D. The first side surface  1300 A and the second side surface  13008  of the base unit  1300  may extend in the lengthwise direction of the base unit  1300 , and the third side surface  1300 C and the fourth side surface  1300 D of the base unit  1300  may extend in the widthwise direction of the base unit  1300 . 
     The signal connection unit CF or the circuit controller CP may be arranged to correspond to the space portion  1300 S. 
     The base unit  1300  may include one or more base protrusion members formed to face the lower unit  1200  and corresponding to the lower groove  1230  of the lower unit  1200 . For example, the base unit  1300  may include the base protrusion  1330  formed to face the lower unit  1200 , and the base protrusion  1330  may include the first base protrusion member  1331  and the second base protrusion member  1332 . 
     The first base protrusion member  1331  and the second base protrusion member  1332  may correspond to the first lower groove  1231  and the second lower groove  1232  of the lower unit  1200 , respectively. The first base protrusion member  1331  and the second base protrusion member  1332  may include curved surfaces to correspond to inner surfaces of the first lower groove  1231  and the second lower groove  1232  of the lower unit  1200 , respectively. 
     The first base protrusion member  1331  and the second base protrusion member  1332  may correspond to the first upper protrusion member  1131  and the second upper protrusion member  1132  of the upper unit  1100 , in the first lower groove  1231  and the second lower groove  1232  of the lower unit  1200 , respectively. 
     The first base protrusion member  1331  and the second base protrusion member  1332  may have various shapes, may protrude from the top surface of the base unit  1300 , and may include outer side surfaces formed to extend from side surfaces of the base unit  1300 , for example, the first side surface  1300 A and the second side surface  13008  of the base unit  1300 , respectively. 
     The base unit  1300  may include one or more base extension members formed to face the lower unit  1200  and corresponding to the lower corresponding unit  1240  of the lower unit  1200 . For example, the base unit  1300  may include the base extension unit  1340  formed to face the lower unit  1200 , and the base extension unit  1340  may include the first base extension member  1341  and the second base extension member  1342 . 
     The first base extension member  1341  and the second base extension member  1342  may correspond to the first lower corresponding member  1241  and the second lower corresponding member  1242  of the lower corresponding unit  1240  of the lower unit  1200 , respectively. 
     Each of the first base extension member  1341  and the second base extension member  1342  may have an elongated region and a region formed at an end thereof to be wider than the elongated region. 
     The wider regions of the ends of the first base extension member  1341  and the second base extension member  1342  may correspond to the step regions of the first lower corresponding member  1241  and the second lower corresponding member  1242  of the lower corresponding unit  1240  of the lower unit  1200 , respectively. Accordingly, after the lower unit  1200  is arranged to be connected to the base unit  1300 , the lower unit  1200  and the base unit  1300  may maintain a state in which they are effectively coupled to each other. In addition, in a state in which the wider regions of the ends of the first base extension member  1341  and the second base extension member  1342  are locked with the step regions of the first lower corresponding member  1241  and the second lower corresponding member  1242 , respectively, the wider regions may be released from the step regions by applying a force, for example, by forcing the first base extension member  1341  and the second base extension member  1342  outward, and then the lower unit  1200  may be separated from the base unit  1300  by lifting up the lower unit  1200 . 
     In an alternative embodiment, the first base extension member  1341  and the second base extension member  1342  may be formed separately from other regions of the base unit  1300 , and for example, may be formed separately and then connected to the side surfaces of the base unit  1300 , respectively. 
     Accordingly, the first base extension member  1341  and the second base extension member  1342  may be formed of various materials, for example, a metal material, and thus, delivery of various electrical signals to adjacent regions may be achieved. 
     As described above, a plurality of information output apparatuses  1000  according to the embodiment may be arranged in one or more directions (the X-axis or Y-axis direction). In this case, the plurality of information output apparatuses  1000  may be connected or coupled to each other. 
     In an alternative embodiment, they may be connected to each other through the base unit  1300 , in detail, by using a plurality of connection protrusion members and a plurality of connection grooves. 
     For example, the connection protrusion members and the connection grooves may be formed on the first side surface  1300 A, the second side surface  1300 B, the third side surface  1300 C, and the fourth side surface  1300 D of the base unit  1300 . 
     In an alternative embodiment, a connection protrusion member  1360 A may be formed on the first side surface  1300 A of the base unit  1300 , for example, a first connection protrusion member  1361 A, a second connection protrusion member  1362 A, and a third connection protrusion member  1363 A may be formed on the first side surface  1300 A. 
     A connection groove  1360 B may be formed on the second side surface  1300 B of the base unit  1300 , for example, a first connection groove  1361 B, a second connection groove  1362 B, and a third connection groove  1363 B may be formed on the second side surface  1300 B. 
     In addition, in an alternative embodiment, a fourth connection protrusion member  1360 C may be formed on the third side surface  1300 C of the base unit  1300 , and a fourth connection groove  1360 D may be formed on the fourth side surface  1300 D of the base unit  1300 . 
     A plurality of information output apparatuses  1000  according to the embodiment may be arranged in the X-axis or Y-axis direction to handle various types and pieces of information. 
     In this case, a plurality of base units  1300  arranged in the X-axis or Y-axis direction may be connected to each other to maintain a stable state. 
     For example, two adjacent base units  1300  arranged in the X-axis direction may be connected or coupled to each other by inserting the first connection protrusion member  1361 A, the second connection protrusion member  1362 A, and the third connection protrusion member  1363 A of the first side surface  1300 A of one base unit  1300 , into the first connection groove  1361 B, the second connection groove  1362 B, and the third connection groove  1363 B of the second side surface  1300 B of the other base unit  1300 , respectively. 
     As another example, two adjacent base units  1300  arranged in the Y-axis direction may be connected or coupled to each other by inserting the fourth connection protrusion member  1360 C of the third side surface  1300 C of one base unit  1300  into the fourth connection groove  1360 D of the fourth side surface  1300 D of the other base unit  1300 . 
     In an alternative embodiment, a window region  1300 W having an open region may be formed on one side surface of the base unit  1300 , for example, the third side surface  1300 C, and window region  1300 W may dissipate heat generated when the information output apparatus  1000  is driven. In addition, the window region  1300 W may be used for inspecting and checking or repairing a region of the lower unit  1200  or the signal connection unit CF. 
       FIGS. 38 to 40  are diagrams for describing an information output apparatus according to another embodiment of the present disclosure. 
     For example, an information output apparatus  10000  of  FIGS. 38 to 40  may include a plurality of information output apparatuses  1000  of  FIG. 1  arranged in a plurality of arrays, for example, in a matrix form. 
     The information output apparatus  10000  may include a controller (not shown) for overall control of the plurality of information output apparatuses  1000 , and may output different pieces of information or the same information, if necessary, to each of the plurality of information output apparatuses  1000  according to a set condition. Accordingly, the user may sense or input information from or onto a large use surface. 
     In detail, referring to  FIG. 38 , the information output apparatus  10000  may include a plurality of information output apparatuses  1000 U 11 ,  1000 U 12 , . . . arranged in the first row in one direction, a plurality of information output apparatuses  1000 U 21 ,  1000 U 22 , . . . ,  1000 U 26 , . . . arranged in the second row in one direction, and a plurality of information output apparatuses  1000 U 31 ,  1000 U 32 , . . . arranged in the third row in one direction. 
     The first groove  1121  of one information output apparatus  1000  and the second groove  1122  of another information output apparatus  1000 , which are adjacent to each other in the lengthwise direction thereof, form a large space, and thus, convenience of management by a user or by using a tool may be improved. 
       FIGS. 39 and 40  illustrate an example of management of the information output apparatus  10000 . 
       FIG. 39  illustrates a state in which the upper unit  1100  of one information output apparatus  1000 U 26  is separated from the lower unit  1200  and then removed. The upper unit  1100  coupled to the upper unit  1200  may be easily separated therefrom after the first extension unit  1221  and the second extension unit  1222  of the extension unit  1220  are forced outward to separate the first locking unit  1221 P and the second locking unit  1222 P from the first step  1121 P and the second step  1122 P, respectively. 
       FIG. 40  illustrates a state in which the lower unit  1200  of the information output apparatus  1000 U 26  is separated from the base unit  1300  and then removed. The lower unit  1200  coupled to the base unit  1300  may be easily separated therefrom after first base extension member  1341  and second base extension member  1342  of the base unit  1300  are forced outward to be separated from the first lower corresponding member  1241  and the second lower corresponding member  1242 , respectively. 
     In an alternative embodiment, the base unit  1300  may include a circuit or power source unit for driving the information output apparatus  10000 , and the circuit or power source unit may include a connecting region BBT and may be exposed to correspond to an inner space of the base unit  1300  when the lower unit  1200  is removed. 
     The information output apparatus according to the embodiment includes one or more expression units, and a plurality of information output apparatuses may be arranged in two intersecting directions and may be easily coupled to or separated from each other. 
     In addition, the base unit, the lower unit, and the upper unit of one information output apparatus may be easily connected or coupled to and separated from each other. 
     Accordingly, the information output apparatus may be more conveniently used and managed. 
     Meanwhile, various methods of transferring a driving force may be used in the embodiments described above with reference to  FIGS. 21 to 40 , and for example, one of the structures of  FIGS. 6 to 20  or one of the embodiments described above with reference to  FIGS. 6 to 20  may be selectively applied. 
     At least one region or the entire region of the moving unit  300  of the embodiments described above with reference to  FIGS. 7 to 11  may be accommodated in the upper unit  1100 . When the moving unit  300  is accommodated in the upper unit  1100 , a holder region corresponding to the moving unit  300  may be formed inside the upper unit  1100 . 
     For example, the body  310  of the moving unit  300  may be mounted in the holder region  350  illustrated in  FIG. 12 , which may include a support groove  351  therein in which the body  310  is accommodated and the rotation shaft  330  of the body  310  is supported. The holder region  350  may have a sufficient space therein to allow the body  310  to rotate in a state in which the rotation shaft  330  is supported by the support groove  351 . 
       FIG. 41  is a diagram illustrating an assembly of a driving unit and a moving unit, according to another embodiment. 
       FIG. 42  is a schematic perspective view for describing the moving part of  FIG. 41 . 
       FIG. 43  is a front view of the moving part of  FIG. 42  seen from one direction. 
       FIG. 44  is a partially perspective view of the assembly of  FIG. 41  seen from one direction. 
     Referring to  FIG. 41 , an expression unit  2210  may be moved according to a movement of a moving part  240 , which will be described below, and may be moved up and down with respect to at least the lengthwise direction of the expression unit  2210 . For example, the expression unit  2210  may be moved in the direction toward the coil unit  1020  and the opposite direction. 
     Accordingly, the expression unit  2210  may be moved to protrude in one direction, and a user may sense the movement of the expression unit  2210  through a tactile or visual sense. 
     The expression unit  2210  may include an expression surface  2211  and a supporting surface  2212 . 
     The supporting surface  2212  in the expression unit  2210  faces the moving part  240 , and forms a lower portion of the expression unit  2210 , and may be arranged separately from the moving part  240  and in contact with the moving part  240  at least one point, and the moving part  240  may deliver a force to the expression unit  2210  via the supporting surface  2212 . 
     The expression surface  2211  is an outermost side of the expression unit  2210 , for example, a region farthest from the coil unit  1020 , and may include a region recognized by a user. 
     For example, the user may recognize the entire area of the expression unit  2210 , but may also recognize only the expression surface  2211 . For example, the user may sense the movement of the expression unit  2210  by contacting the expression surface  2211 , and may easily sense the movement of the expression unit  2210  by visually sensing the expression surface  2211 . 
     In an alternative embodiment, the expression surface  2211  may include a curved surface. 
     The expression unit  2210  may have various shapes and may include a pillar-shaped region. 
     Also, in an alternative embodiment, a protruding region of the expression unit  2210  may have a curved surface, and a corner of the expression unit  2210  may have a curved surface. 
     The expression unit  2210  may include various materials, for example, an insulating material that is light-weight and has an excellent durability. For example, the expression unit  2210  may include a resin-based organic material. In another example, the expression unit  2210  may include an inorganic material such as a ceramic material. 
     Also, in another alternative embodiment, the expression unit  2210  may include a material such as metal or glass. 
     In addition, the expression unit  2210  may be selectively applied to the present specification. 
     As described above, when a magnetic field is generated by a current flowing through the coil unit  1020 , a driving force is transferred to the expression unit  2210  through the magnetic field, and for example, the driving force may be provided to the expression unit  2210  through the movement of the moving part  240 . 
     In an alternative embodiment, an end of the driving support unit  1070  may be elongated to support the moving part  240 , and in another alternative embodiment, the moving part  240  may move while being supported by the end of the driving support unit  1070 . 
     In an alternative embodiment, the driving support unit  1070  may be formed to correspond to the penetration portion  1250  of the lower unit  1200 . 
     In an alternative embodiment, the driving support unit  1070  may be connected to a driving support main body  1072 , and for example, may be integrally formed with the driving support main body  1072 . 
     In an alternative embodiment, a pedestal unit  280  may be further provided and may surround the driving support main body  1072 . In an alternative embodiment, the pedestal unit  280  may include a protrusion  281  on a region thereof, and may be easily handled through a region of the protrusion  281 . 
     An inner accommodation region  232  may be formed in the upper unit  1100 , and may include the above-described holder region. 
     When the upper unit  1100  and the lower unit  1200  are connected or coupled to each other, inner spaces thereof may be connected to each other through the penetration portion  1250 . 
     In an alternative embodiment, a driving groove  234  may be formed in the inner accommodation region  232  of the upper unit  1100 . For example, the driving groove  234  may be formed in each of opposite side surfaces facing each other in the inner accommodation region  232 , and in an alternative embodiment, may extend in one direction, for example, in a direction away from the coil unit  1020 . 
     In an alternative embodiment, the driving groove  234  may be formed as a groove or a through hole penetrating to the outside. The driving groove  234  may be formed as a groove from which one region therein is removed, without penetrating to the outside. 
     The moving part  240  may be arranged in the inner accommodation region  232  of the upper unit  1100 . The moving part  240  may be spaced apart from the coil unit  1020  in a state in which the moving part  240  is arranged in the inner accommodation region  232 . 
     The moving part  240  is arranged adjacent to the coil unit  1020  and is driven by the electric current flowing through the coil unit  1020  to perform an angular movement or a rotational movement. The expression unit  2210  may be moved in upper and lower directions, for example, in one direction toward the coil unit and the opposite direction, via the movement of the moving part  240 . 
     In an alternative embodiment, the moving part  240  may include a magnetic unit  250 , for example, in an internal space thereof. For example, the magnetic unit  250  may include a magnetic material, for example, a permanent magnet. 
     The magnetic unit  250  may include a first region (e.g., N-pole or S-pole) and a second region (e.g., S-pole or N-pole) having different polarities from each other, and the first region and the second region having the different polarities from each other may be arranged in a direction from the coil unit  1020  toward the expression unit  2210  at a point during the rotation of the moving part  240 , for example, in the Z-axis direction. 
     For example, the first and second regions having different polarities in the magnetic unit  250  may be arranged in a direction from the coil unit  1020  toward the expression unit  2210 , for example, in the Z-axis direction. 
     The moving part  240  includes a driving surface  241   a  on at least an outer surface thereof, and the driving surface  241   a  is formed to support the expression unit  2210  and provides a driving force for the expression unit  2210  to be moved up and down. 
     In an alternative embodiment, the driving surface  241   a  of the moving part  240  may have a curved outer surface. In more detail, the driving surface  241   a  of the moving part  240  may include a boundary line that is formed similarly to a circle. 
     The moving part  240  may include a movement controller  249 . 
     The location at which the moving part  240  is moved may be controlled by the movement controller  249 . For example, when the moving part  240  is moved by the coil unit  1020 , the moving part  240  may perform an angular or rotational movement about the movement controller  249 . 
     In an alternative embodiment, the central axis of the moving part  240  and the movement controller  249  may not be coincident with each other, but may be eccentric with respect to each other. 
     In addition, in an alternative embodiment, the magnetic unit  250  does not coincide with the central axis of the moving part  240 , and may be arranged, for example, to overlap a region of the movement controller  249 . 
     As such, a torque force with respect to the moving part  240  may be easily generated and the moving part  240  performs an angular or rotational movement such that a movement relative to the expression unit  2210  may be performed effectively and a precise expression of the information output apparatus may be improved. Also, power consumption of the information output apparatus may be reduced. 
     The moving part  240  will be described in more detail with reference to  FIGS. 42 to 44 . 
     Referring to  FIGS. 42 and 43 , the moving part  240  may include a first moving member  243  and a second moving member  244 , and may include a separate area SA between the first and second moving members  243  and  244 . 
     The first moving member  243  and the second moving member  244  may each include the driving surface  241   a  on at least one of outer surfaces thereof so as to support the expression unit  2210  when the moving part  240  is moved and to provide the expression unit  2210  with a driving force. 
     In an alternative embodiment, the outer surfaces of the first and second moving members  243  and  244  may include curved surfaces. For example, the first moving member  243  and the second moving member  244  may each have a shape similar to a rotator, and may each have a shape similar to a disc. 
     As such, when the first moving member  243  and the second moving member  244  perform a rotational or angular movement, a driving force is naturally provided to the supporting surface  2212  of the expression unit  2210  such that the expression unit  2210  may effectively perform a continuous and natural movement. 
     The movement controller  249  may be arranged on at least one side surface of the first moving member  243  and the second moving member  244 , for example, on each of the surfaces opposite to the side surfaces facing each other in the first moving member  243  and the second moving member  244 . 
     In an alternative embodiment, the movement controller  249  may have a protruding shape, which may correspond to the driving groove  234  formed in the inner accommodation region  232  of the upper unit  1100 . 
     For example, the moving part  240  may be moved by the magnetic field generated due to the coil unit  1020 , and in detail, the moving part  240  may move up and down due to a repulsive force and an attractive force applied to the magnetic unit  250  in the moving part  240 . Here, the moving part  240  may move up and down while rotating about the movement controller  249 , and the moving part  240  may rotate in a state in which the movement controller  249  is arranged in the driving groove  234 . For example, the movement controller  249  may rotate in the driving groove  234 . Also, in an alternative embodiment, the movement controller  249  may slightly move up and down while rotating in the driving groove  234 . 
     A first moving region  245  and a second moving region  248  may be arranged in the separate area SA between the first moving member  243  and the second moving member  244 . 
     The first moving region  245  and the second moving region  248  may be regions that respectively serve as references for a lowest point and a highest point of the movement of the moving part  240 . 
     For example, when the first moving region  245  is at a lowermost portion, that is, a region closest to the coil unit  1020 , the moving part  240  is at the lowest point, and accordingly, the expression unit  2210  is at the lowest point, in detail, a protrusion height of the expression unit  2210  from the upper unit  1100  has a minimum value. 
     Also, when the second moving region  248  is at a lowermost portion, that is, a region closest to the coil unit  1020 , the moving part  240  is at the highest point, and accordingly, the expression unit  2210  is at the highest point, in detail, a protrusion height of the expression unit  2210  from the upper unit  1100  has a maximum value. 
     In an alternative embodiment, the first moving region  245  and the second moving region  248  may be supported by the driving support unit  1070 . That is, when the moving part  240  is moved, the driving support unit  1070  is arranged to correspond to the separate area SA between the first moving member  243  and the second moving member  244 , so as to support the first moving region  245  and the second moving region  248  according to time. 
     In an alternative embodiment, a connecting region  247  may be arranged between the first moving region  245  and the second moving region  248 , and the connecting region  247  may include a curved surface. 
     When the moving part  240  rotates, the driving support unit  1070  may support at least a region of the connecting region  247  before supporting the second moving region  248  after supporting the first moving region  245 , and as such, the moving part  240  naturally moves and the movement of the expression unit  2210  may be accurately controlled. 
     A distance between the driving surface  241   a  and the first moving region  245  may be different from a distance between the driving surface  241   a  and the second moving region  248 . For example, the distance between the driving surface  241   a  and the first moving region  245  may be greater than the distance between the driving surface  241   a  and the second moving region  248 . 
     In an alternative embodiment, due to the shape of the moving part  240 , a distance from the central axis to the first moving region  245  may be less than a distance from the central axis to the second moving region  248 . 
     In an alternative embodiment, a distance from the movement controller  249  to the first moving region  245  may be equal or similar to a distance from the movement controller  249  to the second moving region  248 , and in an additional alternative embodiment, a distance from the movement controller  249  to the connecting region  247  may be also equal or similar to the distance from the movement controller  249  to the second moving region  248 . 
     For example, the connecting region  247  may correspond to at least a region of a circumference having a radius around a center point of the movement controller  249 . As such, when the moving part  240  rotates about the movement controller  249 , the position of the movement controller  249  may be maintained identically or similarly when the driving support unit  1070  supports the first moving region  245 , the second moving region  248 , and the connecting region  247 . 
     Also, when being supported by the driving support unit  1070 , the connecting region  247  includes a curved surface or a nearly arc surface, and thus, the moving part  240  may move smoothly and sufficiently. 
     Referring to  FIG. 44 , the inner accommodation region  232  of the upper unit  1100  may include a first groove  232 C and a second groove  232 D. 
     The first groove  232 C and the second groove  232 D may be deeply recessed toward the coil unit  1020 . The first moving member  243  and the second moving member  244  may respectively correspond to the first groove  232 C and the second groove  232 D. As such, when the driving force is transferred to the moving part  240  via the coil unit  1020 , the moving part  240  may perform an angular or rotational movement in a state in which the first moving member  243  and the second moving member  244  of the moving part  240  are arranged to correspond to the first groove  232 C and the second groove  232 D, respectively, and may move up and down. Accordingly, the moving part  240  may be stably moved, and accurate control of the movement of the expression unit  2210  may be easily performed. 
     In an alternative embodiment, a protrusion region PT may be formed between the first groove  232 C and the second groove  232 D. For example, the protrusion region PT may be formed to be connected to the penetration portion  1250 . In detail, the driving support unit  1070  may protrude through the penetration portion  1250  to reach the protrusion region PT. 
     In this case, in an alternative embodiment, the driving support unit  1070  may further protrude as compared with the protrusion region PT, and in this case, the first moving region  245  and the second moving region  248  may be supported by the driving support unit  1070  according to time. In an embodiment, the first moving region  245  may be supported by the upper end of the driving support unit  1070 , in detail, in contact therewith. Accordingly, the state in which the expression unit  2210  is at the lowest point may include that the expression unit  2210  is physically latched by the upper end of the driving support unit  1070 . In addition, the second moving region  248  may be supported by the upper end of the driving support unit  1070 , in detail, in contact therewith. Through this, the state in which the expression unit  2210  is at a point which is different from the lowest point, in an alternative embodiment, at the highest point, may include that the expression unit  2210  is physically latched by the upper end of the driving support unit  1070 . 
     In an alternative embodiment, the driving support unit  1070  may not further protrude as compared with the protrusion region PT, and in this case, the first moving region  245  and the second moving region  248  may be supported by the protrusion region PT according to time. 
     For example, the first moving region  245  is supported by the top surface of the protrusion region PT, and the state in which the expression unit  2210  is at the lowest point may include that the expression unit  2210  is physically latched by the top surface of the protrusion region PT. 
     In addition, the second moving region  248  is supported by the top surface of the protrusion region PT, and the state in which the expression unit  2210  is at the highest point may include that the expression unit  2210  is physically latched by the top surface of the protrusion region PT. 
     Also, in an alternative embodiment, the driving support unit  1070  or the protrusion region PT may not support or may temporarily support the moving part  240 , and in this case, the movement controller  249  may be supported by a region of the inner accommodation region  232  of the upper unit  1100 , for example, may be supported by a boundary surface of the driving groove  234 . 
       FIGS. 45 and 46  are diagrams for describing a relationship between a moving part and an expression unit, according to another embodiment of the present disclosure. 
     Referring to  FIGS. 45 and 46 , a moving part  3400  and an expression unit  3110  are included. Although the members of the above-described embodiments, such as a coil unit, are not illustrated for convenience of description, the members in the above-described embodiments or appropriate modifications thereof may be applied. 
     The expression unit  3110  may be moved according to movement of the moving part  3400 , and may be moved at least upward and downward in the lengthwise direction thereof. 
     The expression unit  3110  may include an expression surface  3111  and a supporting surface  3112 . 
     In addition, although not illustrated, the expression unit  3110  may include a magnetic body (not shown) therein. 
     As an alternative embodiment, the expression unit  3110  may have a space portion formed therein, and the space portion may be open toward the moving part  3400 . 
     The moving part  3400  may be moved, for example, as described in the above-described embodiments, may be moved through a magnetic field generated by a current flowing through the coil unit. 
     In addition, the moving part  3400  may be supported by the protrusion region PT during movement. Although not illustrated, the moving part  3400  may be supported by the driving support unit  1070  described in the above-described embodiment. 
     As an alternative embodiment, the moving part  3400  may include a driving controller  3490 , for example, on at least one side surface thereof, for example, on facing side surfaces thereof. 
     In an alternative embodiment, the moving part  3400  may perform an angular or rotational movement around the driving controller  3490 . 
     A stopper part  3470  may be formed in one region of the moving part  3400 . The stopper part  3470  may have a shape protruding to have a height from a driving surface of the moving part  3400 , for example, from an outer surface thereof having a closed curve similar to a circle. 
     Accordingly, the stopper part  3470  may serve as a barrier against a member adjacent to the stopper part  3470  as illustrated in  FIGS. 45 and 46 . 
     For example, as illustrated in  FIG. 45 , the stopper part  3470  may serve as a barrier against the supporting surface  3112  of the expression unit  3110  and may be resistance to the continuous angular movement in one direction of the moving part  3400 , and, as illustrated in  FIG. 46 , the stopper part  3470  may serve as a barrier against the protrusion region PT and may be resistance to the continuous angular movement in one direction of the moving part  3400 . 
     Also, although not illustrated, during the angular movement of the moving part  3400 , the stopper part  3470  may function as various barriers while being supported by adjacent members according to design conditions. 
     Through the stopper part  3470 , it is possible to control an unnecessary continuous angular or rotational movement of the moving part  3400  to reduce the vibration of the expression unit  3110 , and to effectively carry out precise control of a movement of the expression unit  3110 . 
     In addition, the moving part  3400  may be effectively controlled to reduce power required to drive the moving part  3400 . 
       FIGS. 47 and 48  are perspective views of moving parts illustrated in  FIGS. 45 and 46 , according to alternative embodiments. 
     Referring to  FIGS. 47 and 48 , a moving part  3400 ′ may include a first moving member  3443 ′ and a second moving member  3444 ′, which are spaced apart from each other to form a space therebetween. 
     The first moving member  3443 ′ and the second moving member  3444 ′ may each include a driving surface  3411   a ′ on at least one of outer surfaces thereof so as to support the expression unit  3110  when the moving part  3400 ′ is moved and to provide the expression unit  3110  with a driving force. 
     In an alternative embodiment, the outer surface of each of the first moving member  3443 ′ and the second moving member  3444 ′ may include a curved surface. For example, the first moving member  3443 ′ and the second moving member  3444 ′ may each have a shape similar to a rotator, and may each have a shape similar to a disc. 
     A driving controller  3490 ′ may be arranged on at least one side surface of each of the first moving member  3443 ′ and the second moving member  3444 ′, for example, on an opposite side surface of each of facing side surfaces of the first moving member  3443 ′ and the second moving member  3444 ′. 
     A first moving region  3445 ′ and a second moving region  3448 ′ may be arranged in the separate area SA between the first moving member  3443 ′ and the second moving member  3444 ′. 
     In an alternative embodiment, when the moving part  3400 ′ is moved through the first moving region  3445 ′ and the second moving region  3448 ′, the expression unit  3110  may be raised and lowered. 
     For example, the first moving region  3445 ′ and the second moving region  3448 ′ may be regions that serve as references for a lowest point and a highest point of the movement of the expression unit  3110 . 
     In an alternative embodiment, the first moving region  3445 ′ and the second moving region  3448 ′ may be supported by the protrusion region PT, and as another example, may be supported by the driving support unit  1070  described in the above-described embodiment. 
     In an alternative embodiment, a connecting region  3447 ′ may be arranged between the first moving region  3445 ′ and the second moving region  3448 ′, and the connecting region  3447 ′ may have a curved surface. 
     Although not illustrated, in an alternative embodiment, a magnetic unit (not shown) may be arranged in the moving part  3400 ′, for example, an inner space  3450 M′ of the moving part  3400 ′. For example, the magnetic unit (not shown) may include a magnetic material, for example, a permanent magnet. A stopper part  3470 ′ may be formed in one region of the moving part  3400 ′. For example, the stopper part  3470 ′ may have a shape protruding from the driving surface  3411   a ′ by at least a height. For example, at least one region of the stopper part  3470 ′ may have a protruding shape to have a height with respect to an outer surface of each of the first moving member  3443 ′ and the second moving member  3444 ′. 
     In an alternative embodiment, the stopper part  3470 ′ may be formed to be adjacent to the outer surfaces of the first moving member  3443 ′ and the second moving member  3444 ′, and for example, may be connected to the second moving region  3448 ′. 
     In an alternative embodiment, the stopper part  3470 ′ may have a height based on the outer surfaces of the first moving member  3443 ′ and the second moving member  3444 ′ and may include regions having different heights. 
     For example, from among regions of the stopper part  3470 ′, the height of a region thereof farther from the second moving region  3448 ′ may be greater than the height of a region thereof connected to the second moving region  3448 ′. 
     Accordingly, the stopper part  3470 ′ may function as effective resistance during the angular movement of the moving part  3400 ′. 
     During the angular movement of the moving part  3400 ′ of the embodiment, once a force is applied only until the moving part  3400 ′ reaches the critical point, the angular movement may be additionally performed even without an additional force applied after that point. 
     Accordingly, only during a portion of the entire time of the operation process of the moving part  3400 ′, a current may be applied to the coil unit and power may be consumed. 
     In an alternative embodiment, only at the initial stage including the start stage of the operation of the moving part  3400 ′, once a current is applied to the coil unit and thus the moving part  3400 ′ starts to move, due to a torque force through the eccentricity, the moving part  3400 ′ may easily perform an angular movement. 
     In addition, for example, a region of the moving part  3400 ′ may be supported by the upper end or a protrusion region of the driving support unit, in detail, in contact therewith, and accordingly, the state in which the expression unit is at the lowest point may include that the expression unit is physically latched. 
     Furthermore, for example, another region of the moving part  3400 ′ may be supported by the driving support unit or a protrusion region, in detail, in contact therewith, and accordingly, the expression unit may be at a point other than the lowest point, in an alternative embodiment, at the highest point, and such a state may include that the expression unit is physically latched by the driving support unit or the protrusion region. 
     The embodiment may be selectively applied to all embodiments of the present disclosure. 
     As described above, the present disclosure has been described with reference to the illustrated embodiment in the drawings, but this is merely exemplary, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present disclosure should be determined by the technical spirit of the appended claims. 
     The specific implementations described in the embodiments are examples, and do not limit the scope of the embodiments in any method. For brevity of the specification, descriptions of conventional electronic configurations, control systems, software, and other functional aspects of the systems may be omitted. In addition, since the connection of the lines between the components or connection members shown in the drawings are illustrative examples of functional connections and/or physical or circuit connections, in the actual device, it may be represented as an alternative or additional various functional connections, physical connections, and circuit connections. In addition, unless “essential”, “important”, etc. are not specifically mentioned, it may not be a necessary component for the application of the present disclosure. 
     In the specification (especially in the claims) of the embodiments, the use of the term “the” and similar indicating terms may correspond to both singular and plural. In addition, in the case where a range is described in the embodiment, since it includes the disclosure in which the individual values belonging to the range are applied, unless otherwise stated, it is the same as describing each individual value constituting the range in the detailed description. Finally, when there is no explicit or contradictory description of steps constituting the method according to the embodiment, the steps may be performed in a suitable order. The embodiments are not necessarily limited to the order in which the steps are described. The use of all the examples or exemplary terms (for example, etc.) in the embodiments is merely for describing the embodiments in detail. Accordingly, the scope of the embodiments may not be limited by the examples or exemplary terms, unless limited by the claims. In addition, those skilled in the art may recognize that various modifications, combinations, and changes may be configured according to design conditions and factors within the scope of the appended claims or equivalents thereof.