Patent Publication Number: US-2023142581-A1

Title: Button composite structure

Description:
TECHNICAL FIELD 
     The present disclosure relates to a button complex structure. 
     BACKGROUND ART 
     In general, a button structure may penetrate a rigid substrate such as glass or quartz and may be fastened to a deck under the rigid substrate. 
     However, in the process of drilling a through hole in the rigid substrate to fasten the button structure to the deck, the rigid substrate may be damaged; in addition, this may result in greater cost consumption and a greatly reduced degree of design freedom. 
     Meanwhile, a display panel may be disposed under the rigid substrate, and the leakage caused by the through hole of the rigid substrate may lead to not only a defective button structure but also a defective display panel. 
     Furthermore, the button structure further includes a circuit unit that accommodates a button input signal, and in the case of a failure of the circuit unit, when it is difficult to fasten the button structure to the deck and separate the same therefrom, the rigid substrate has to be decomposed and the failed button structure needs be separated from the deck. This will prevent easy decomposition of the rigid substrate. 
     DISCLOSURE 
     Technical Problem 
     Aspects of the present disclosure provide a button complex structure including a button structure directly stacked on a rigid substrate without forming a through hole of a rigid substrate. 
     However, aspects of the present disclosure are not restricted to the one set forth herein. The above and other aspects of the present disclosure will become more apparent to one of ordinary skill in the art to which the present disclosure pertains by referencing the detailed description of the present disclosure given below. 
     Technical Solution 
     A button complex structure according to one embodiment of solving the aspect may include: a display panel including a first substrate, a second substrate on the first substrate, and a liquid crystal layer between the first substrate and the second substrate; a member on the second substrate; a first coupling member configured to couple the display panel to one surface of the member; a button structure disposed on the other surface opposite to the one surface of the member; and a second coupling member configured to couple the other surface of the member to the button structure, wherein the member includes a third substrate and the button structure is directly coupled to the third substrate via the second coupling member, wherein the button structure includes a button body fixed to the third substrate, a button circuit unit fastened to the button body, a button connected to the button circuit unit, and further includes a first communication unit disposed between the member and the display panel and a second communication unit disposed in the button circuit unit. 
     The button body may include a locking pin, the button circuit unit may include a locking groove, and the button circuit unit may be fastened to the button body by inserting the locking pin into the locking groove. 
     A plurality of locking pins are provided, and a plurality of locking grooves are provided, and the button circuit unit may be separated from the button body in such a way that each of the plurality of locking pins is simultaneously taken out from the locking grooves corresponding to a plurality of unlocking pins. 
     The button complex structure may further include a third coupling member disposed between the first communication unit and one surface of the member, and the first communication unit may be attached to one surface of the member by the third coupling member. 
     The button circuit unit may include a circuit board on which a button switch may be disposed, the button switch may be in contact with the button, and the button switch may receive an input signal input to the button. 
     The second communication unit may be disposed between the circuit board and the button body. 
     The second communication unit may be electrically connected to the circuit board, and the second communication unit may provide the input signal to the first communication unit when the input signal is provided to the button switch via the button. 
     The button complex structure may include a signal line electrically connected to the first communication unit, the signal line may include a first signal line, and the first signal line may provide the input signal provided to the first communication unit to the display panel. 
     The signal line may include a second signal line, the second signal line may provide the first communication unit with an on/off signal that controls on/off of the button switch, and the first communication unit may provide the on/off signal to the second communication unit. 
     The signal line may be disposed between the member and the display panel. 
     The button complex structure may further include a light emitting element disposed on the circuit board, the signal line may include a third signal line, the third signal line may provide a power signal of the light emitting element to the first communication unit, and the first communication unit may provide the power signal of the light emitting element to the first communication unit. 
     The light emitting element may emit light according to the input signal input to the button. 
     The button complex structure may further include a focus variable unit disposed to overlap the light emitting element and disposed in the button circuit unit, and the focus variable unit may change the focus of light provided from the light emitting element. 
     The first communication unit may include a wireless power transmitter, and the second communication unit may include a wireless power receiver. 
     Each of the first communication unit and the second communication unit may include a short-range communication unit. 
     The button may include a transparent material. 
     The member may further include a touch layer on the third substrate, the touch layer may include one surface of the member, and the touch layer may be coupled to the display panel by the first coupling member. 
     Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. 
     Advantageous Effects 
     According to the button complex structure according to one embodiment, the button structure may be directly stacked on the rigid substrate without forming a through hole of the rigid substrate, which reduces damage to the rigid substrate, reduces costs, and increases the degree of design freedom. 
     In addition, since the through hole is not formed, a failure of the display panel and the button structure due to leakage may be reduced. 
     In addition, the button structure includes the button body fixed to the rigid substrate and the button circuit unit including the circuit unit, so that only the button circuit unit may be easily replaced when the circuit unit fails. 
     In addition, since the operation of the button complex structure is controlled via wireless communication units (including a transmitter and receiver), the signal line connected to the circuit board does not need to penetrate the rigid substrate. Accordingly, the reliability of the button complex structure may be ensured. 
     The effects according to the present disclosure are not limited to the above-described contents, and other various effects are included in the present specification. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a block diagram of a button complex structure according to one embodiment; 
         FIG.  2    is a cross-sectional view of the button complex structure according to one embodiment; 
         FIG.  3    is a top plan view of the button complex structure according to one embodiment; 
         FIG.  4    is a cross-sectional view of the button complex structure according to one embodiment; 
         FIG.  5    is a top plan view illustrating a button body and a button circuit unit according to one embodiment; 
         FIG.  6    is a top plan view illustrating a state where the body portion button body and the button circuit unit are fastened according to one embodiment; 
         FIG.  7    is a top plan view illustrating a state where the button body and the button circuit unit are disassembled according to one embodiment; 
         FIG.  8    is a cross-sectional view illustrating a state where the button and the button circuit unit are fastened according to one embodiment; and 
         FIG.  9    is a cross-sectional view illustrating a state where the button body and the button circuit are disassembled according to one embodiment. 
     
    
    
     MODE FOR DISCLOSURE 
     The merits and characteristics of the present disclosure and a method for achieving the merits and characteristics will become more apparent from the embodiments described in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the disclosed embodiments, but may be implemented in various different ways. The embodiments are provided to only complete the disclosure of the present disclosure and to allow those skilled in the art to understand the category of the present disclosure. The present disclosure is defined by the category of the claims. 
     Indicating that elements or layers are “on” other elements or layers include both a case in which the corresponding elements are just above other elements and a case in which the corresponding elements are intervened with other layers or elements. The same reference numerals indicate the same elements throughout the specification. 
     Although the terms first, second, etc. may be used to describe various elements, it should be understood that these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element to be described below could be termed as a second element, without departing from the scope of exemplary embodiments. 
     Hereinafter, various embodiments of the present disclosure will be described with reference to the attached drawings: 
       FIG.  1    is a block diagram of a button complex structure according to one embodiment. 
     Referring to  FIG.  1   , the button complex structure according to one embodiment may include a touch recognition unit TP, a first display unit DP 1 , and a second display unit DP 2 . 
     The touch recognition unit TP may serve to recognize a touch input. For example, when a touch input is performed on the button complex structure, the touch recognition unit TP may generate touch input signals S 1  and S 2 . 
     The first display unit DPI may include a display panel configured to display an image. A liquid crystal display panel may be applied as the display panel. Although the liquid crystal display panel is described as an example of the display panel in the following description, the display panel is not limited thereto, and may be applied to an electrophoresis display panel, an organic light emitting display panel, a micro-LED display panel, a plasma display panel, an electric field emission display panel, a cathode-ray display panel, and so forth. 
     The first display unit DP 1  may be electrically connected to the touch recognition unit TP. The first display unit DP 1  may receive a touch input signal S 1  generated by the touch recognition unit TP and display a screen corresponding to the touch input signal S 1 . 
     The second display unit DP 2  may include a light emitting element configured to emit light. Relevant examples of the light emitting element include LEDs. That is, the second display unit DP 2  may include an LED light emitting element. However, the present disclosure is not limited thereto, and the second display unit DP 2  may include a halogen lamp, an incandescent bulb, or three wavelengths. 
     The second display unit DP 2  may be electrically connected to the touch recognition unit TP. The second display unit DP 2  may receive a touch input signal S 2  generated by the touch recognition unit TP and emit light corresponding to the touch input signal S 2 . 
     In some embodiments, the second display unit DP 2  may emit light regardless of the touch input signal S 2  generated by the touch recognition unit TP. 
     Hereinafter, a more detailed structure of the button complex structure according to one embodiment will be described. The drawing reference numerals of each component of the button complex structure in  FIG.  1    described above are described for convenience of description and may differ from the drawing reference numerals of each component of the button complex structure to be described below. 
       FIG.  2    is a cross-sectional view of the button complex structure according to one embodiment. 
     Referring to  FIG.  2   , a button complex structure  1  according to one embodiment may include a display panel  10 , a member  20 , and a button structure  30 . 
     The display panel  10  may include the same structure as the first display unit DP 1  in  FIG.  1    described above. 
     The display panel  10  may include a first substrate  11 , a second substrate  12  that faces the first substrate  11 , and a liquid crystal layer  13  interposed between the first substrate  11  and the second substrate  12 . A sealing member  14  is disposed at the edges of the first substrate  11  and the second substrate  12 , and couples the first substrate  11  and the second substrate  12  to prevent liquid crystal molecules of the liquid crystal layer  13  from leaking to the outside. 
     One of the first substrate  11  and the second substrate  12  may be a thin film transistor substrate, and the other may be a color filter substrate. In the present embodiment, it is described that the first substrate  11  is the thin film transistor substrate and the second substrate  12  is the color filter substrate. A display direction may be an outer direction of an upper surface of the second substrate  12 . The second substrate  12  may be disposed above the first substrate  11  based on the display direction. Accordingly, the second substrate  12  may be an upper substrate, and the first substrate  11  may be a lower substrate. 
     Each of the first substrate  11  and the second substrate  12  may include an insulating substrate made of glass or quartz, and structures such as a wiring, a metal, a semiconductor layer, an insulating film, a color filter, and a black matrix disposed thereon. Each of the structures may be disposed on one surface where the insulating substrate of the first substrate  11  faces the insulating substrate of the second substrate  12 . For convenience, an illustration of the structure disposed on the insulating substrate is omitted in the drawing, and only the shapes of the first substrate  11  and the second substrate  12  are illustrated. Hereinafter, when referring to a rear shape of the first substrate  11  or the second substrate  12 , the corresponding shape may refer to a rear shape of the insulating substrate of the first substrate  11  or a rear shape of the insulating substrate of the second substrate  12 . 
     A member  20  attached to the display panel  10  may be disposed on the display panel  10 . 
     The member  20  may include a third substrate  21  and a touch layer TSL. The touch layer TSL may be disposed on the third substrate  21 . The touch layer TSL may be disposed between the third substrate  21  and the second substrate  12 . 
     A first coupling member AM 1  may be disposed between the touch layer TSL and the second substrate  12 . The touch layer TSL and the second substrate  12  may be coupled to each other via the first coupling member AM 1 . The first coupling member AM 1  may be a double-sided tape, but the present disclosure is not limited thereto, and a conventional coupling member may be applied to the first coupling member AM 1 . 
     The first coupling member AM 1  may be disposed in both ends between the touch layer TSL and the second substrate  12 . That is, a gap may be disposed between the touch layer TSL and the second substrate  12  in a central portion where the first coupling member AM 1  is not disposed. The touch layer TSL and the second substrate  12  may be spaced apart from each other via the gap. 
     The third substrate  21  may be an insulating substrate made of glass or quartz. The third substrate  21  may include the same material as the first substrate  11 . The planar size of the third substrate  21  may be identical to the planar size of the second substrate  12 , but the present disclosure is not limited thereto. 
     The touch layer TSL may be disposed on one surface of the third substrate  21  that faces the second substrate  12 . 
     The touch layer TSL may include a plurality of touch electrodes and a touch insulating layer that covers the plurality of touch electrodes. The touch electrode may include a conductive material, and the touch insulating layer may include an inorganic material or an organic material. 
     The plurality of touch electrodes may be disposed on one surface of the third substrate  21 , and the touch insulating layer may be disposed on the plurality of touch electrodes to cover the plurality of touch electrodes. 
     The touch insulating layer may be in direct contact with the first coupling member AM 1 . The touch insulating layer may be attached to the second substrate  12  via the first coupling member AM 1 . 
     The touch layer TSL may sense a touch input signal applied on the other surface which is a surface opposite to one surface of the third substrate  21 . The touch layer TSL may obtain coordinates of a touch input point in a capacitive way. The capacitance way may obtain coordinate information of a point touched by the self-capacitance manner or the mutual capacitance manner. 
     A button structure  30  may be disposed on the member  20 . The button structure  30  may be disposed on the other surface of the third substrate  21 . That is, the touch layer TSL may be disposed between the button structure  30  and the touch insulating layer, and the member  20  may be disposed between the button structure  30  and the display panel  10 . 
     In some embodiments, the touch layer TSL of the member  20  may be omitted. In that case, the third substrate  21  of the member  20  may be in direct contact with the first coupling member AM 1  and may be coupled to the display panel  10  via the first coupling member AM 1 . 
     The button structure  30  may include a button body  40 , a button circuit unit  50 , a light emitting unit  60 , and a button  70 . 
     Meanwhile, a first communication unit PSP may be disposed on one surface (lower surface) that faces the display panel  10  in the drawing of the member  20 . The first communication unit PSP may be disposed between the member  20  and the display panel  10 . A second coupling member AM 2  may be disposed between the first communication unit PSP and the member  20 . That is, the first communication unit PSP may be attached to the member  20  via the second coupling member AM 2 . The first communication unit PSP may include the wireless power transmitter. The first communication unit PSP may include a short-range communication unit in some embodiments. 
     A signal line SL may be connected to the first communication unit PSP. The signal line SL may be electrically connected to the first communication unit PSP and extend in the right direction in the drawing. The signal line SL may be disposed between the member  20  and the display panel  10  and may extend to penetrate the first coupling member AM 1 . 
     A third coupling member AM 3  may be disposed between the button structure  30  and the third substrate  21 . The third coupling member AM 3  may be an adhesive, but the present disclosure is not limited thereto. 
     The button body  40  may be in direct contact with the third coupling member AM 3 . The button body  40  may be directly attached and fixed to another surface of the third substrate  21  via the third coupling member AM 3 . 
     The button circuit unit  50  may be fastened to the button body  40 , and the button  70  may be connected to the button circuit unit  50 . 
     Although not illustrated in the drawings, a circuit board (see “ 51 ” in  FIG.  4   ) and a second communication unit (see “PRP” in  FIG.  4   ) may be further disposed in the button circuit unit  50 . 
       FIG.  3    is a top plan view of the button complex structure according to one embodiment. 
     Referring to  FIG.  3   , the planar shapes of the button circuit unit  50  and the light emitting unit  60  may include a ring shape including a circular opening. The planar shape of the button  70  may include a circular shape. However, the present disclosure is not limited thereto, and the planar shapes of the button circuit unit  50  and the light emitting unit  60  include an opening at the center thereof, and there is no limitation as long as the shape surrounds the opening. In addition, the planar shape of the button  70  is not limited thereto, and may include a rectangle, a square, an oval, or another polygon. 
     In the described embodiment, the shape of the opening of the button circuit unit  50  may be identical to the planar shape of the button  70 . However, the present disclosure is not limited thereto, and the shape of the opening of the button circuit unit  50  may differ from the planar shape of the button  70 . 
       FIG.  4    is a cross-sectional view of the button complex structure according to one embodiment. 
     Referring to  FIG.  4   , the button body  40  may be divided into a first portion forming a lower line and a second portion protruding from the first portion, but the present disclosure is not limited thereto. A locking pin  45  may be disposed in the first portion of the button body  40 . The locking pin  45  may protrude from the first portion of the button body  40  in a thickness direction. 
     A button circuit unit  50  may be disposed on the button body  40 . The button circuit unit  50  may be disposed in an upper portion of the first portion of the button body  40  and on the left side of the second portion thereof. 
     A locking groove  55  may be disposed on a lower surface of the button body  40 . The locking groove  55  may include a shape indented upwards from the lower surface of the button body  40 . 
     The button circuit unit  50  may have a lock/unlock relationship with the button body  40  in such a way that the locking pin  45  is inserted into the locking groove  55 . That is, when the locking pin  45  is inserted into the locking groove  55 , the button circuit unit  50  may have a fastening relationship (lock state) with the button body  40 , and when the locking pin  45  is taken out from the locking groove  55 , the button circuit unit  50  may have a separation relationship (unlock state) with the button body  40 . 
     The inserting/taking-out relationship between the locking groove  55  and the locking pin  45  will be described below with reference to  FIGS.  5  to  9   . 
     The button circuit unit  50  may include a circuit board  51 . A button switch  53  and a light emitting element  61  of the light emitting unit  60  may be disposed on the circuit board  51 . The light emitting unit  60  may have the same configuration as the second display unit DP 2  in  FIG.  1    described above. 
     Relevant examples of the light emitting element  61  may include LEDs. That is, the light emitting element  61  may include an LED light emitting element. However, the present disclosure is not limited thereto, and the light emitting element  61  may include a halogen lamp, an incandescent bulb, or three wavelengths. 
     Although not illustrated, the circuit board  51  may be electrically connected to a second communication unit PRP to be described below. 
     The button switch  53  may be disposed on the circuit board  51  and may be disposed to protrude from a surface of the button circuit unit  50 . 
     The button  70  may be disposed on a side surface of the button circuit unit  50  and may be disposed on an upper part of the button switch  53  of the button circuit unit  50 . The button  70  may be in direct contact with the button switch  53 . 
     The button  70  may include a transparent material. 
     A focus variable unit  65  may be further disposed on an upward surface of the light emitting unit  60  of the button circuit unit  50 . 
     The focus variable unit  65  may be disposed to overlap the light emitting element  61  in the thickness direction. 
     The focus variable unit  65  may serve to variably control the focus of light emitted from the light emitting element  61 . For example, the focus variable unit  65  may include an optical lens. 
     The button circuit unit  50  may include an indentation pattern IDP where a part of the portion facing the button  70  is indented in the direction moving away from the button  70 . That is, the indentation pattern IDP may include a shape indented in the right direction in the drawing from a side surface facing the button  70  of the button circuit unit  50 . 
     The button circuit unit  50  may include a “⊏” cross-sectional shape inverted left and right by the indentation pattern IDP of the button circuit unit  50 . The button switch  53  may have a shape protruding from a lower side (or line) of the left and right inverted “⊏” cross-sectional shape. 
     The button  70  may be disposed on the side surface of the button circuit unit  50  and may be disposed between a lower side (or line) and an upper side (or line) among the left and right inverted “⊏” cross-sectional shape of the button circuit unit  50 . The button  70  may include a protruding pattern PT protruding towards the indentation pattern IDP of the button circuit unit  50 . The protruding pattern PT may include a shape protruding towards the right side in the drawing. The protruding pattern PT may be in direct contact with the button switch  53 . 
     The button circuit unit  50  may include a first sub-circuit unit  50   a  and a second sub-circuit unit  50   b  classified according to positions. The first sub-circuit unit  50   a  may be disposed below the button circuit unit  50 , and the second sub-circuit unit  50   b  may be disposed above the button circuit unit  50 . The aforementioned circuit board  51  may be disposed in the second sub-circuit unit  50   b.  A second communication unit PRP may be disposed in the first sub-circuit unit  50   a.  The second communication unit PRP may be disposed between the circuit board  51  and the button body  40 . 
     The second communication unit PRP may include a wireless power receiver. The second communication unit PRP may include the short-range communication unit in some embodiments. 
     Hereinafter, an operation of the button complex structure  1  will be described in more detail. 
     A physical touch signal may be input via the button  70 . The physical touch signal may be a physical pressure. Hereinafter, the physical touch signal will be referred to as an input signal. 
     The physical touch signal may be input via the button  70 . Hereinafter, the physical touch signal will be referred to as an input signal. The button switch  53  may receive an input signal input to the button  70 . 
     The second communication unit PRP may be electrically connected to the circuit board  51 . The button complex structure  1  according to one embodiment may provide the input signal to the first communication unit PSP when the input signal is provided to the button switch  53  via the button  70 . 
     In this case, each of the first communication unit PSP and the second communication unit PRP may include the short-range communication unit. 
     A plurality of signal lines SL may include a first signal line, a second signal line, a third signal line, and a fourth signal line. A plurality of signal lines SL may be electrically connected to the first communication unit PSP. 
     The first signal line may provide the input signal provided to the first communication unit PSP to the display panel  10 . 
     That is, when the input signal is applied to the first communication unit PSP, the first signal line connected to the first communication unit PSP may provide the input signal to the display panel  10  and the display panel  10  may output a screen according to the input signal. 
     The second signal line may provide the first communication unit PSP with an on/off signal that controls on/off of the button switch  53 . 
     When the second signal line provides the on/off signal of the button switch  53  to the first communication unit PPSP, the first communication unit PPSP provides the on/off signal to the second communication unit PRP, thus controlling the on/off signal of the button switch  53 . 
     In this case, the first communication unit PSP may include the wireless power transmitter, and the first communication unit PSP may include the wireless power receiver. 
     The third signal line may provide the power signal of the light emitting element  61  to the first communication unit PSP. That is, when the power signal of the light emitting element  61  is provided to the first communication unit PPSP via the third signal line, the first communication unit PPSP may transmits the applied power signal to the second communication unit PRP. 
     The fourth signal line may emit light according to the input signal obtained by inputting the light emitting element  61  to the button  70 . 
     In other words, when the input signal is applied to the button  70 , the input signal may be provided to the second communication unit PRP connected to the circuit board  51 , and the input signal provided to the second communication unit PRP may be provided to the first communication unit PSP. The input signal provided to the first communication unit PSP may be transmitted to a main controller via the fourth signal line, a signal for controlling a light emitting event of the light emitting element  61  may be provided from the main controller back to the first communication unit PSP, and the light emitting event signal provided to the first communication unit PSP may be provided to the second communication unit PRP and then provided to the light emitting element  61  of the circuit board. 
     In some embodiments, when the fourth signal line is omitted, and the input signal is generated in the button  70  via the button switch  53 , the light emitting element  61  may emit light right away via the circuit board  51 . 
       FIG.  5    is a top plan view illustrating a button body and a button circuit according to one embodiment.  FIG.  6    is a top plan view illustrating a state where the body portion button body and the button circuit unit are fastened according to one embodiment.  FIG.  7    is a top plan view illustrating a state where the button body and the button circuit unit are disassembled according to one embodiment.  FIG.  8    is a cross-sectional view illustrating a state where the button and the button circuit unit are fastened according to one embodiment.  FIG.  9    is a cross-sectional view illustrating a state where the button body and the button circuit are disassembled according to one embodiment. 
     First, referring to  FIG.  5   , a plurality of locking pins  45  of the button body  40  may be provided. The arrangement of the locking pin  45  illustrated in the drawings is not limited thereto. 
     A plurality of locking grooves  55  of the button circuit  50  may be provided. In one embodiment, the number of locking grooves  55  may be identical to the number of locking pins  45 . 
     Referring to  FIG.  6   , the plurality of locking pins  45  and the plurality of locking grooves  55  may overlap each other in the thickness direction. 
     The locking pin  45  protruding from a surface of the button body  40  in the thickness direction may be inserted into the locking groove  55  indented upwards from a bottom surface of the button body  40 . Each of the plurality of locking pins  45  may be inserted into the locking grooves  55  corresponding to the thickness direction thereof. 
     In this way, the locking groove  55  may have a lock/unlock relationship with the button body  40  in such a way that the locking pin  45  is inserted into the locking groove  55 . 
     The locking pin  45  may include an insertion portion inserted into the locking groove  55 , a body portion connected to a lower part of the insertion portion, and an elastic portion SP connected to a lower part of the body portion. In the cross-sectional view, the width of the insertion portions may be smaller than that of the body portion and the elastic portions SP, respectively. A portion of the body portion protruding to one side from the insertion portion may have a shape inclined in the cross-sectional view. 
     Referring to  FIG.  7   , as in the embodiment of  FIG.  6   , the button circuit unit  50  coupled to the button body  40  may rotate clockwise (as illustrated in the drawing) or counterclockwise, thus separating the button circuit unit  50  from the button body  40 . However, even if the button circuit unit  50  is rotated due to the locking pin  45  inserted into the locking groove  55 , the locking pining  45  may not be easily taken out from the locking groove  55 . 
     Referring to  FIGS.  8  and  9   , the button circuit unit  50  may be separated from the button body  40  in such a way that the locking pin  45  is taken out from the locking groove  55  by an unlocking pin PIN. 
     In other words, the unlocking pin PIN may press a portion protruding and inclined to one side from the insertion portion of the body portion of the locking pin  45  in the direction of the other side opposite to the one side, thereby taking out the insertion portion of the locking pin  45  from the locking groove  55 . 
     As described above, the locking pin  45  according to one embodiment further includes the elastic portion SP connected to the bottom of the body portion, and the elastic portion SP may include a spring. The elastic portion SP may serve to facilitate taking out the insertion portion from the locking groove  55  by allowing the locking pin  45  to easily move downwards when the portion protruding and inclined to one side from the insertion portion of the body portion of the locking pin  45  is pressed in the direction of the other side opposite to the one side via the unlocking pin PIN. 
     Since there are the plurality of locking grooves  55  and the plurality of locking pins  45  corresponding to each other according to one embodiment, the button body  40  and the button circuit  50  may be completely separated from each other only when the plurality of locking pins  45  are simultaneously moved downwards. 
     In other words, the button circuit unit  50  may be completely separated from the button body  40  in such a way that the plurality of locking pins  45  corresponding to each of the plurality of locking grooves  55  are simultaneously taken out by means of the plurality of unlocking pins PINs. 
     As illustrated in  FIG.  9   , when the insertion portion is taken out from the locking groove  55 , the button circuit unit  50  coupled to the button body  40  may rotates clockwise (illustrated in the drawings) or counterclockwise, thus separating the button circuit unit  50  from the button body  40 . 
     When the button structure penetrates the third substrate and is fastened to the deck of the bottom of the third substrate, the process of drilling a through hole in the third substrate to fasten the button structure to the deck may cause damage to the third substrate as well as increase cost consumption and reduce the degree of design freedom. 
     However, according to the button complex structure  1  according to one embodiment, the button structure  30  is directly stacked on the third substrate  21  without forming the through hole of the third substrate  21 , thereby reducing damage to the third substrate  21 , reducing costs, and increasing the degree of design freedom. 
     In addition, when the button structure is fastened to the deck of the bottom of the third substrate via the through hole of the third substrate, defects of the display panel and the button structure may occur due to leakage by the through hole of the third substrate. 
     However, in the case of the button complex structure  1  according to one embodiment, since the through hole is not formed in the third substrate  21 , a failure of the display panel  10  and the button structure  30  caused by the leakage may be reduced. 
     Furthermore, the button structure further includes the circuit unit that receives the button input signal, and in the case of a failure of the circuit unit, when the button structure has difficulty being separated from the deck after the fastening thereof, the third substrate has to be decomposed to separate the failed button structure from the deck. In that case, since the third substrate is not easily decomposed, repair of the button structure may be time-consuming. 
     However, according to the button complex structure  1  according to one embodiment, the button body  40  not including the circuit unit including the circuit board  51  may be fixed to the third substrate  21  and the button circuit  50  including the circuit unit is locked/unlocked with the button body  40 , and accordingly, when the circuit unit fails, only the button circuit unit  50  can be easily replaced to repair the button structure in a short time. 
     Furthermore, by providing the plurality of locking grooves  55  and the plurality of locking pins  45  of the button complex structure  1  according to one embodiment which correspond to each other, the button circuit unit  50  needs to be completely separated from the body portion button body  40  in such a way that the plurality of locking pins  45  corresponding to each of the plurality of locking grooves  55  are simultaneously taken out by the plurality of unlocking pins PINs, thereby easily preventing theft of the button body  40  and the bottom  70 . 
     Furthermore, by controlling the operation of the button complex structure  1  via the wireless communication units (PSP and PRP of one embodiment), the signal line may not be physically connected to the circuit board  51  and the signal line may not penetrate the third substrate  21  as a rigid substrate. This will ensure the reliability of the button complex structure  1 . 
     Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, the present disclosure is not limited to the disclosed embodiments, but may be implemented in various different ways, and the present disclosure may be embodied in many different forms without changing technical subject matters and essential features as will be understood by those skilled in the art. Therefore, embodiments set forth herein are exemplary only and not to be construed as a limitation.