Patent Publication Number: US-2022229327-A1

Title: Display apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a Continuation Application, under 35 U.S.C. § 111(a), of PCT Application No. PCT/KR2020/005148, filed on Apr. 17, 2020, which claims the priority benefit under 35 U.S.C. § 119 of Korean Application No. 10-2019-0134039, filed Oct. 25, 2019, the contents of both of which are incorporated by reference herein in their entirety. 
    
    
     BACKGROUND 
     Field 
     The disclosure relates to a display apparatus, and more particularly, to a display apparatus with a reduced size of bezel to enhance the aesthetic impression. 
     Description of Related Art 
     A display apparatus is a kind of output device for visually presenting data information and images, such as text or figures, including a television, various kinds of monitors, many different kinds of portable terminals (e.g., notebooks, tablet personal computers (PCs), and smart phones), etc. 
     The display apparatus may include a display panel for presenting a screen and a bezel arranged on edges of the display panel. 
     These days, display apparatuses with slim or no bezel are being developed to enhance their aesthetic impressions. 
     SUMMARY 
     In accordance with an aspect of the disclosure, a display apparatus includes a rear chassis including a fastening hole, a light source module installed at the rear chassis and configured to emit light, a diffuser plate to diffuse light emitted from the light source module, a liquid crystal panel arranged in front of the diffuser plate and configured to display an image, a front chassis arranged to cover sides of the liquid crystal panel and the diffuser plate, a middle mold to couple the diffuser plate so that the diffuser plate is arranged in front of the light source module, the middle mold including a fastening groove to align with the fastening hole of the rear chassis, a bonding member arranged between the middle mold and the diffuser plate to bond the diffuser plate to the middle mold, and a fastening member coupleable to the fastening groove of the middle mold by passing through the fastening hole of the rear chassis from behind the rear chassis to couple the rear chassis to the middle mold. 
     The front chassis may include a fixing hole arranged to align with the fastening hole and the fastening groove. 
     The display apparatus may include a first fastening hole to align with the fastening groove of the middle mold and the fixing hole of the front chassis, and a second fastening hole covered by the front chassis. 
     The fastening member may include a first fastening member to be coupled to the fastening groove by passing through the fixing hole and the first fastening hole to couple the front chassis and rear chassis to the middle mold, and a second fastening member to be coupled to the fastening groove by passing through the second fastening hole to couple the rear chassis to the middle mold. 
     The fastening member may include a fastening portion arranged to be inserted and coupled to the fastening groove, and a head portion having a diameter larger than a diameter of the fastening groove. 
     The first fastening member may include a first head portion. 
     The first head portion may be arranged on the outside of the front chassis. 
     The second fastening member may include a second head portion. 
     The second head portion may be arranged between the rear chassis and the front chassis and covered by the front chassis. 
     The front chassis may be decoupled from the display apparatus by separating the first fastening member from the middle mold. 
     The rear chassis and the light source module installed at the rear chassis may be decoupled from the display apparatus by detaching the first fastening member from the middle mold and detaching the second fastening member from the middle mold. 
     The display apparatus may further include a chassis bonding member arranged between the front chassis and the middle mold to bond the front chassis to the middle mold. 
     The rear chassis and the light source module installed at the rear chassis may be decoupled from the display apparatus by detaching the fastening member from the middle mold. 
     The display apparatus may further include a panel bonding member arranged between the liquid crystal panel and the middle mold to bond the liquid crystal panel to the middle mold. 
     The panel bonding member may include ultraviolet (UV) resin applied in a liquid state and hardened by a UV ray. 
     Outermost sides of the middle mold may be coplanar with sides of the liquid crystal panel, or located father inside than the sides of the liquid crystal panel. 
     In accordance with an aspect of the disclosure, a display apparatus includes a rear chassis including a fastening hole, a light source module installed at the rear chassis and configured to emit light, a diffuser plate for diffusing light emitted from the light source module, a liquid crystal panel arranged in front of the diffuser plate and configured to display an image, a front chassis arranged to cover sides of the liquid crystal panel and the diffuser plate, a middle mold to fix the diffuser plate and the liquid crystal panel so that the diffuser plate is arranged in front of the light source module, the middle mold including a fastening groove to align with the fastening hole, a first bonding member arranged between the middle mold and the diffuser plate to bond the diffuser plate to the middle mold, a second bonding member arranged between the middle mold and the liquid crystal panel to bond the liquid crystal panel to the middle mold, a fastening member coupled to the fastening groove by passing through the fastening hole from behind the rear chassis to fasten the rear chassis to the middle mold. 
     The front chassis, the rear chassis and the light source module installed at the rear chassis may be decoupled from the display apparatus by detaching the fastening member from the middle mold in the rear of the display apparatus. 
     The front chassis may include a fixing hole arranged to align with the fastening hole and the fastening groove. 
     The fastening hole may include a first fastening hole that aligns with the fastening groove and the fixing hole, and a second fastening hole covered by the front chassis. 
     The fastening member may include a first fastening member coupled to the fastening groove by passing through the fixing hole and the first fastening hole to fix the front chassis and rear chassis to the middle mold, and a second fastening member coupled to the fastening groove by passing through the second fastening hole to couple the rear chassis to the middle mold. 
     The first fastening member may include a first head portion arranged outside of the front chassis. 
     The second fastening member may include a second head portion arranged between the rear chassis and the front chassis and covered by the front chassis. 
     In accordance with an aspect of the disclosure, a display apparatus includes a rear chassis including a fastening hole, a light source module installed at the rear chassis and configured to emit light, a diffuser plate for diffusing light emitted from the light source module, a liquid crystal panel arranged in front of the diffuser plate and configured to display an image, a front chassis arranged to cover sides of the liquid crystal panel and the diffuser plate, a middle mold to fix the diffuser plate so that the diffuser plate is arranged in front of the light source module, the middle mold including a fastening groove to align with the fastening hole; a first bonding member arranged between the middle mold and the diffuser plate to bond the diffuser plate to the middle mold, a second bonding member arranged between the middle mold and the front chassis to bond the front chassis to the middle mold, and a fastening member to be coupled to the fastening groove by passing through the fastening hole from behind the rear chassis to couple the rear chassis to the middle mold. 
     Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates an exterior of a display apparatus, according to an embodiment of the disclosure. 
         FIG. 2  is an exploded view of a major structure of a display apparatus, according to an embodiment of the disclosure. 
         FIG. 3  is a cross-sectional view of a display apparatus, according to an embodiment of the disclosure. 
         FIG. 4  is a side cross-sectional view of a display apparatus, according to an embodiment of the disclosure. 
         FIG. 5  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 6  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 7  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 8  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 9  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 10  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 11  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 12  is a rear perspective view of a display apparatus, according to an embodiment of the disclosure. 
         FIG. 13  is an enlarged view of portion A of  FIG. 12 . 
         FIG. 14  illustrates a front chassis decoupled from what is shown in  FIG. 13 . 
         FIG. 15  is a cross-sectional view along line B-B′ of  FIG. 12 . 
         FIG. 16  illustrates decoupling of a front chassis from what is shown in  FIG. 15 . 
         FIG. 17  is a cross-sectional view along line C-C′ of  FIG. 12 . 
         FIG. 18  is a cross-sectional view along line D-D′ of  FIG. 13 . 
         FIG. 19  illustrates decoupling of a rear chassis and a light source module from what is shown in  FIG. 18 . 
         FIG. 20  is a cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
         FIG. 21  illustrates decoupling of a rear chassis and a light source module from what is shown in  FIG. 20 . 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments and features as described and illustrated in the disclosure are merely examples, and there may be various modifications replacing the embodiments and drawings at the time of filing this application. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. It is to be understood that the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise. It will be further understood that the terms “comprise” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     The terms including ordinal numbers like “first” and “second” may be used to explain various components, but the components are not limited by the terms. The terms are only for the purpose of distinguishing a component from another. Thus, a first element, component, region, layer or room discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the disclosure. 
     According to an embodiment, the disclosure provides a display apparatus with a reduced size of bezel to enhance the aesthetic impression. 
     According to an embodiment, the disclosure also provides a display apparatus with reduced thickness from front to back to enhance the aesthetic impression. 
     The disclosure, according to an embodiment, also provides a display apparatus with a light source module detachable from behind the display apparatus. 
     While a display apparatus with a reduced size of bezel to enhance the aesthetic impression, a display apparatus with reduced thickness from front to back may be provided to enhance the aesthetic impression, and a display apparatus with a light source module detachable from behind the display apparatus are mentioned, these features are merely examples. 
     Directions “front”, “back (or rear)”, “top”, “bottom”, “left”, and “right” will be defined throughout the specification with respect to the directions shown in  FIG. 1 . In  FIG. 1 , X-, Y-, and Z-axes perpendicular to one another are shown, where the X-axis represents a left-to-right direction, the Y-axis represents a vertical direction, and the Z-axis represents a front-to-back direction. 
     Reference will now be made in detail to embodiments of the disclosure with reference to accompanying drawings. 
       FIG. 1  illustrates an exterior of a display apparatus, according to an embodiment of the disclosure.  FIG. 2  is an exploded view of a major structure of a display apparatus, according to an embodiment of the disclosure.  FIG. 3  is a cross-sectional view of a display apparatus, according to an embodiment of the disclosure.  FIG. 4  is a side cross-sectional view of a display apparatus, according to an embodiment of the disclosure. 
     Referring to  FIGS. 1 to 4 , a display apparatus according to an embodiment of the disclosure will now be described. 
     A display apparatus  1  may include a liquid crystal panel  10  for displaying an image, a backlight unit arranged behind the liquid crystal panel  10  to provide light to the liquid crystal panel  10 , a rear chassis  30  for supporting the backlight unit, a front chassis  20  for covering edges of the liquid crystal panel  10 , and a middle mold  40  coupled between the front chassis  20  and the rear chassis  30 . 
     The display panel  10  may include a thin-film transistor substrate with thin-film transistors arranged thereon in the form of a matrix, a color-filter substrate coupled in parallel with the thin-film transistor substrate, and liquid crystal injected between the thin-film transistor substrate and the color-filter substrate and having optical properties that vary by changes in voltage or temperature. 
     The backlight unit may be arranged behind the liquid crystal panel  10  to illuminate the liquid crystal panel  10 . The backlight unit may include a light source module  50  including a light source  51  and a substrate  52  with the light source  51  mounted thereon, and an optical member arranged in a traveling path of the light emitted from the light source  51 . 
     In an embodiment of the disclosure, a plurality of substrates  52  may be provided in the form of plates. It is not, however, limited thereto, but the substrates  252  may have the form of bars. 
     The size and/or number of light source modules  50  may depend on the size of the display apparatus  1 . In an embodiment of the disclosure, there may be eight light source modules  50 , and the size of the eight light source modules  50  combined may be equal to the size of the liquid crystal panel  10 . 
     A driving power line may be formed on the substrate  52  to supply driving power to the light source  51  and connected to a signal cable (not shown) and a backlight driving circuit (not shown). 
     A plurality of light sources  51  may be mounted on each of the plurality of substrates  52  with certain gaps. The light source  51  may include light emitting diodes (LEDs). Alternatively, the light source  51  may include a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL). 
     In the embodiment of the disclosure, a plurality of lenses  53  may be mounted on the substrate  52  to cover the respective light sources  51 . The lens  53  may cover the light source  51  to diffuse light emitted from the light source  51 . 
     A reflector sheet  54  may be provided for each of the plurality of substrates  52 . The reflector sheet  54  may have the size corresponding to the substrate  52 . The reflector sheet  54  may stick to a mounting surface of the substrate  52  on which the light source  51  is mounted. In other words, the reflector sheet  54  may be placed on the upper surface of the substrate  52 . The reflector sheet  54  may have a through hole  55  formed for the light source  51  and the lens  53  to pass through. 
     The reflector sheet  54  may reflect light to prevent losses of light. Specifically, the reflector sheet  54  may reflect light emitted from the light source  51  or light reflecting backward from a diffuser plate  63  to the rear surface  63   a  of the diffuser plate  63 . The reflector sheet  54  may prevent losses of light emitted from the light source  51  by hindering the light emitted from the light source  51  from traveling to the back of the display apparatus  1 . 
     The backlight unit may include optical members  61 ,  62 , and  63  arranged along the traveling path of light emitted from the light source  51 . 
     The optical members  61 ,  62 , and  63  may include a diffuser plate  63  for uniformly diffusing uneven light emitted from the light source  51 , and first and second optical sheets  61  and  62  for enhancing properties of light. 
     The diffuser plate  63  may uniformly diffuse the uneven light generated from the light sources  51 . The diffuser plate  63  may uniformly diffuse the light incident on the rear surface  63   a  to be output to the front surface  63   b.    
     The first and second optical sheets  61  and  62  may be arranged in front of the diffuser plate  63  to enhance optical properties of the light output from the diffuser plate  63 . Although the first and second optical sheets  61  and  62  are shown in the drawings, the number of optical sheets may be more or less than 2. 
     The first and second optical sheets  61  and  62  may include a diffuser sheet for offsetting a pattern of the diffuser plate  63 , a prism sheet for concentrating the light to enhance brightness, a protection sheet for protecting the other optical sheets against an external shock or inflow of foreign materials, a reflective polarizing sheet (e.g., dual brightness enhancement film (DBEF)) for transmitting polarized light while reflecting differently polarized light to enhance brightness, a complex sheet for uniformly diffusing light, a quantum dot sheet for changing wavelengths of light to improve color reproductivity, etc. Quantum dots, which are illuminant semiconductor crystals in a few nanometers, may be distributed inside the quantum dot sheet. The quantum dot may receive blue light to produce any colors of visible light depending on the size of the quantum dot. The smaller the quantum dot is, the shorter wavelength of light may be produced, and the larger the quantum dot is, the longer wavelength of light may be produced. 
     In the embodiment of the disclosure, the first and second optical sheets  61  and  62  and the diffuser plate  63  may be provided in one body. Bonding members may be provided between the first and second optical sheets  61  and  62  and between the second optical sheet  62  and the diffuser plate  63 , integrating the first and second optical sheets  61  and  62  and the diffuser plate  63  into one body like a single sheet. 
     The rear chassis  30  may be arranged behind the backlight unit. In the embodiment of the disclosure, the rear chassis  30  may be shaped substantially like a plate with the edges bending forward. The backlight unit may be accommodated between the rear chassis  30  and the liquid crystal panel  10  and front chassis  20 . 
     The rear chassis  30  may include a base  31  on which the light source module  50  is installed, and a bent portion  32  formed on the top, bottom, left and right edges of the rear chassis  30  to be coupled with the middle mold  40 . 
     The base  31  may contact the substrate  52  to radiate heat generated from a heating element such as the light source  51  mounted on the substrate  52 . For this, the rear chassis  30  including the base  31  may be formed with, but not exclusively to, various metal substances such as aluminum, steel use stainless (SUS), etc., with high heat transfer efficiency. The rear chassis  30  may be formed with a plastic material such as ABS. 
     The bent portion  32  may be inserted to an insertion groove  41  formed at the middle mold  40 . When the bent portion  32  is inserted to the insertion groove  41 , the rear chassis  30  and the middle mold  40  may be primarily coupled to each other. 
     The rear chassis  30  may further include a middle mold supporter  33  for supporting the middle mold  40 , and a link  34  connecting the middle mold supporter  33  to the base  31 . 
     The middle mold supporter  33  may be formed between the bent portion  32  and the base  31  to support the middle mold  40 . The link  34  may be provided to connect the middle mold supporter  33  and the base  31 . The link  34  may slantingly extend backward from an end of the base  31  to connect to an end of the middle mold supporter  33 . The bent portion  32  may be formed at the other end of the middle mold supporter  33 . 
     The light source module  50  may be placed between the base  31  and the diffuser plate  63 , and the middle mold  40  may be placed between the middle mold supporter  33  and the diffuser plate and liquid crystal panel  10 . A distance between the base  31  and the liquid crystal panel  10  may be shorter than a distance between the middle mold supporter  33  and the liquid crystal panel  10 . 
     The front chassis  20  may be shaped like a frame with an opening  21  for the light from the backlight unit to be provided to the liquid crystal panel  10 . The front chassis  20  may be provided to cover the sides of the liquid crystal panel  10  and the middle mold  40 . 
     For the conventional display apparatus, the front chassis supports the liquid crystal panel by covering the front edges of the liquid crystal panel. Edges around the liquid crystal panel defined by the front chassis is called a bezel, and the bezel causes the size of a screen display area of the liquid crystal panel to be reduced. Furthermore, a thick bezel causes an aesthetic impression on the display apparatus to get worse. 
     According to the disclosure, the front chassis  20  may be provided to cover the sides of the liquid crystal panel  10  but not to cover the front of the liquid crystal panel  10 . As the front chassis  20  does not cover the screen display area of the liquid crystal panel  10 , the size of the screen display area of the liquid crystal panel  10  does not shrink from the front chassis  20 . Accordingly, the size of the screen display area of the liquid crystal panel  10  of the display apparatus  1  may be enlarged. 
     Furthermore, according to the disclosure, thickness of the front chassis  20  in the left-right direction may be reduced. The thickness of the front chassis  20  in the left-right direction may indicate the size of the bezel. The front chassis  20  has a structure to perform a function of covering the sides of the liquid crystal panel  10  and the middle mold  40 , which may be performed even without having thick thickness of the front chassis  20 . Accordingly, in the embodiment of the disclosure, the display apparatus  1  may have a bezel with a reduced size, and thus have an enhanced aesthetic impression. 
     Similar to the front chassis  20 , the middle mold  40  may be shaped like a frame with an opening  40   a  for the light from the backlight unit to be provided to the liquid crystal panel  10 . The middle mold  40  may be coupled to the rear chassis  30  and the front chassis  20 . The middle mold  40  may fix the diffuser plate  63  and the first and second optical sheets  61  and  62 . Furthermore, the middle mold  40  may fix the liquid crystal panel  10 . 
     The middle mold  40  may be placed on the middle mold supporter  33  of the rear chassis  30 . The middle mold  40  may include the insertion groove  41  for the bent portion  32  of the rear chassis  30  to be inserted thereto. As described above, as the bent portion  32  is inserted to the insertion groove  41 , the middle mold  40  and the rear chassis  30  may be primarily coupled to each other. 
     The middle mold  40  may fix the diffuser plate  63 . The middle mold  40  may include a sheet bonding surface  42 . The sheet bonding surface  42  is a surface of the middle mold  40  facing the diffuser plate  63  at a certain distance from the diffuser plate  63 . 
     A first bonding member  71  may be provided between the sheet bonding surface  42  and the diffuser plate  63 . The first bonding member  71  may be made with a transparent substance. For example, the first bonding member  71  may include a pressure sensitive adhesive (PSA) having more than 90% of light transmittance. With the first bonding member  71  made with a material having high light transmittance, light emitted from the light source module  50  may pass through the first bonding member  71  and enter into the diffuser plate  63 . This may prevent losses of light. 
     The first bonding member  71  may be provided to bond the sheet bonding surface  42  of the middle mold  40  and the rear surface  63   a  of the diffuser plate  63 . With the first bonding member  71 , the optical members  61 ,  62 , and  63  may be coupled to the middle mold  40  without an extra structure. 
     In the conventional display apparatus, an extra structure is provided to support the optical sheets. The structure presses the optical sheets to prevent them from being decoupled, but causes the display apparatus to be thick and further the bezel to be thick. 
     According to the embodiment of the disclosure, the optical members  61 ,  62 , and  63  may be coupled to the middle mold  40  by the first bonding member  71  without an extra structure. Accordingly, the display apparatus may become slim and the bezel size may also be reduced. 
     In the embodiment of the disclosure, the middle mold  40  may be coupled to the liquid crystal panel  10  to prevent the liquid crystal panel  10  from falling out forward from the display apparatus  1 . The middle mold  40  may include the supporting projection  43  protruding toward the liquid crystal panel  10 . The supporting projection  43  may include a panel bonding surface  43   a  facing the rear surface of the liquid crystal panel  10 . The second bonding member  72  may be provided between the panel bonding surface  43   a  and the rear surface of the liquid crystal panel  10 . The second bonding member  72  may be provided to bond the panel bonding surface  43   a  of the middle mold  40  and the rear surface of the liquid crystal panel  10 . With the second bonding member  72 , the liquid crystal panel  10  may be fixedly coupled to the middle mold  40 . 
     In the embodiment of the disclosure, as described above, the liquid crystal panel  10  may be fixed to the middle mold  40  by adhesive power of the second bonding member  72 . The liquid crystal panel  10  may be decoupled from the middle mold  40  when the adhesive power of the second bonding member  72  becomes weak, so that strong adhesive power of the second bonding member is required to support the liquid crystal panel  10 . To meet this requirement, the second bonding member  72  may include ultraviolet (UV) resin. When the second bonding member  72  is the UV resin, the second bonding member  72  may be applied in a liquid state on the panel bonding surface  43   a  and hardened by UV rays, thereby bonding the panel bonding surface  43   a  to the rear surface of the liquid crystal panel  10 . 
     The middle mold  40  may also include a sheet supporting plane  44  arranged between the supporting projection  43  and the sheet bonding surface  42 . The sheet supporting plane  44  may protrude almost as much as the thickness of the first bonding member  71  from the sheet bonding surface  42  to the diffuser plate  63 . The sheet supporting plane  44  may be provided to contact and support the diffuser plate  63 . The supporting projection  43  may protrude toward the liquid crystal panel  10  from the sheet supporting plane  44 . Alternatively, the sheet supporting plane  44  may not contact the diffuser  63  or may be omitted. When the sheet supporting plane  44  is omitted, the supporting projection  43  may be formed by protruding from the sheet bonding surface  42 . 
     In the embodiment of the disclosure, the middle mold  40  may include a light guide plane  45 . The light guide plane  45  may guide light generated from the light source  51  to enter into the diffuser plate  63 . Specifically, the light guide plane  45  may guide the light generated from the light source  51  to enter into the first bonding member  71  or to a surface of the diffuser plate  63  that comes into contact with the first bonding member  71 . The light guide plane  45  may be inclined not to interfere with the traveling path of the light. The light guide plane  45  may prevent the middle mold  40  from interfering with the traveling path of light generated from the light source  51  when the light passes through the lens  53  and enters into the diffuser plate  63 . The inclination angle of the light guide plane  45  may be determined by taking into account properties of the light. The inclination angle of the light guide plane  45  may be determined by taking into account a profile of the light. 
     Otherwise, when the light guide plane  45  is not provided or the sheet bonding surface  42  extends up to the substrate  52 , light generated from the light source  51  and traveling toward the first bonding member  71  may be blocked by the middle mold  40  in the traveling path. When the light is blocked in the traveling path and fails to reach a portion where the first bonding member  71  is placed, brightness of the liquid crystal panel  10  in the portion where the first bonding member  71  is placed is degraded or uneven. The light guide plane  45  provides a traveling path for light to allow the light to reach a location where the first bonding member  71  is placed. Accordingly, in the embodiment of the disclosure, the display apparatus  1  may prevent degradation or unevenness of brightness of the liquid crystal panel  10 . 
     The middle mold  40  may be arranged not to protrude sideways from the liquid crystal panel  10 . In other words, an outermost side  40   b  of the middle mold  40  may be coplanar with a side  10   a  of the liquid crystal panel  10 , or located farther inside than the side  10   a  of the liquid crystal panel  10 . Although the side  40   b  of the middle mold  40  is shown as being coplanar with the side  10   a  of the liquid crystal panel  10 , it may be located farther inside than the side  10   a  of the liquid crystal panel  40 . 
     A side  22  of the front chassis  20  may be arranged to cover sides of the liquid crystal panel  40  and the middle mold  10 . The side  22  of the front chassis  20  may include an inner side surface  22   a  facing the side  40   b  of the middle mold  40  and an outer side surface  22   b  opposite to the inner side surface  22   a . According to the disclosure, the inner side surface  22   a  and the outer side surface  22   b  may be provided in parallel and may extend in an almost straight line along the front-back direction. A distance between the inner and outer side surfaces  22   a  and  22   b  of the front chassis  20  corresponds to the size of the bezel of the display apparatus. According to the disclosure, the inner and outer side surfaces  22   a  and  22   b  of the front chassis  20  do not protrude sideways but extend in an almost straight line along the front-back direction, so the size of the bezel may be very thin. 
     In the conventional display, the middle mold is provided to protrude outwards from the liquid crystal panel, and the front chassis is provided to cover the middle mold protruding sideways from the liquid crystal panel. As the front chassis covers the middle mold, the size of the bezel defined by the front chassis is larger than the portion of the middle mold protruding outwards from the liquid crystal panel. That is, the conventional display has a limitation on reducing the size of the bezel because the middle mold protrudes outwards from the liquid crystal panel. 
     On the contrary, according to the embodiment of the disclosure, the middle mold  40  may be provided without such a portion that protrudes outwards from the liquid crystal panel  10 . The front chassis  20  may be arranged very closely to the sides of the liquid crystal panel  10  because there is no portion protruding outwards from the liquid crystal panel  10 . Furthermore, the front chassis  20  has a structure of covering the sides of the liquid crystal panel  10  and the sides of the middle mold  40 , it may perform the function of covering the sides without difficulty even when the thickness become thinner. Accordingly, the thickness of the side  22  of the front chassis  20  may be provided to be very thin. As the size of the bezel is proportional to the thickness of the side  22  of the front chassis  20 , the size of the bezel of the display apparatus  1  may be reduced by minimizing the thickness of the side  22  of the front chassis. With the reduced size of the bezel, the display apparatus  1  may give an enhanced aesthetic impression. 
     In the embodiment of the disclosure, the front chassis  20 , the rear chassis  30 , and the middle mold  40  may be combined by a fastening member S that is provided separately. The middle mold  40  may include a fastening groove  46  into which the fastening member S is inserted and coupled. The rear chassis  30  may include a first fastening hole  35  formed to correspond to the fastening groove  46  and for the fastening member S to pass through. The front chassis  20  may include a second fastening hole  23  formed to correspond to the fastening groove  46  and the first fastening hole  35  and for the fastening member S to pass through. 
     The fastening member S may pass through the first and second fastening holes  35  and  23  and may be fastened into the fastening groove  46 . In an embodiment of the disclosure, the fastening member S may be screwed into the fastening groove  46 . When the fastening member S is fastened into the fastening groove  46 , the front chassis  20  may be fixedly coupled to the rear chassis  30 . Furthermore, when the fastening member S is fastened into the fastening groove  46 , the rear chassis  30  and the middle mold  40  may be secondarily coupled to each other. 
       FIG. 5  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
     In the embodiment of the disclosure, a display apparatus may include a liquid crystal panel  10 , a backlight unit arranged behind the liquid crystal panel  10  to provide light to the liquid crystal panel  10 , a rear chassis  30  for supporting the backlight unit, a front chassis  20  for covering edges of the liquid crystal panel  10 , and a middle mold  140  coupled between the front chassis  20  and the rear chassis  30 . 
     The structure except for the middle mold  140  is equal to that of the previous embodiment as described above, so the overlapping description will not be repeated. 
     The middle mold  140  may include a supporting projection  143 . The supporting projection  143  may include a panel bonding surface  143   a  facing the rear surface of the liquid crystal panel  10 . The second bonding member  72  may be provided between the panel bonding surface  143   a  and the rear surface of the liquid crystal panel  10 . 
     In the embodiment of the disclosure, the supporting projection  143  may further include a light reflecting plane  143   b . The light reflecting plane  143   b  may be provided to reflect the light emitted from the light source  51 . The light reflecting plane  143   b  may be formed to be sunken from a surface of the supporting projection  143 . Specifically, it may be formed by being sunken from a surface of the supporting projection  143  facing the side of the diffuser plate  63 . The light reflecting plane  143   b  may be formed as a curved plane to uniformly reflect light. The light reflecting plane  143   b  may be a smoothly curved plane without angulation. The light reflecting plane  143   b  may be formed to be sunken toward the side of the diffuser plate  63 . 
     The light reflecting plane  143   b  may prevent portions of the edges of the liquid crystal panel  10  from having excessively high brightness. The light reflecting plane  143   b  may reduce an amount of light emitted through the edges of the liquid crystal panel  10  by reflecting the light backward. This may prevent relative increase of brightness of the portions of the edges of the liquid crystal panel  10 , and accordingly, the liquid crystal panel  10  may have uniform brightness across the entire area. 
       FIG. 6  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
     In the embodiment of the disclosure, a display apparatus may include a liquid crystal panel  10 , a backlight unit arranged behind the liquid crystal panel  10  to provide light to the liquid crystal panel  10 , a rear chassis  230  for supporting the backlight unit, a front chassis  20  for covering edges of the liquid crystal panel  10 , and a middle mold  240  coupled between the front chassis  20  and the rear chassis  230 . 
     The backlight unit may be arranged behind the liquid crystal panel  10  to illuminate the liquid crystal panel  10 . The backlight unit may include a light source module  250  including a light source  251  and a substrate  252  with the light source  251  mounted thereon, and an optical member arranged in a traveling path of the light emitted from the light source  251 . 
     In the embodiment of the disclosure, the light source module  250  may include a plurality of substrates  252  in the form of plates. It is not, however, limited thereto, but the substrates  252  may have the form of bars. 
     The size and/or number of light source modules  250  may be different depending on the size of the display apparatus. In the embodiment of the disclosure, there may be eight light source modules  250 , and the size of the eight light source modules  250  combined may be equal to the size of the liquid crystal panel  10 . 
     A plurality of light sources  251  may be mounted on each of the plurality of substrates  252  with certain gaps. The light source  251  may include light emitting diodes (LEDs). A reflector sheet  253  may be placed on the substrate  252 . The reflector sheet  253  may reflect light to prevent losses of light. The reflector sheet  253  may include a plurality of through holes  253   a  for the plurality of light sources  251  to pass through. A light guide film  254  may be placed on the reflector sheet  253 . The light guide film  254  may diffuse and guide light generated from the light source  251  to the front. The light guide film  254  may make the light sources  251  from point light sources to a surface light source. Similar to the reflector sheet  253 , the light guide film  254  may also include a plurality of through holes  254   a.    
     In the embodiment of the disclosure, the light source module  250  may not include a lens. Accordingly, a least distance required between the light source and the diffuser plate may be reduced as compared with an occasion when the lens is provided. Furthermore, a distance between a base  231  of the rear chassis  230  and the liquid crystal panel  10  may be reduced. With the reduced distance between the base  231  and the liquid crystal panel  10 , thickness of the display apparatus from front to back may be reduced. With the reduced thickness of the display apparatus, the display apparatus may give an enhanced aesthetic impression. 
     In the embodiment of the disclosure, a link  234  of the rear chassis may be provided to be almost perpendicular to the base  231  and a middle mold supporter  233 . A bent portion  232  may be inserted to an insertion groove  141  of the middle mold  240 . 
     In the embodiment of the disclosure, the middle mold  240  may include the sheet bonding surface  242 . No projection may be provided on the sheet bonding surface  242 . The first bonding member  71  may be provided between the sheet bonding surface  242  and the rear surface  63   a  of the diffuser plate  63 . The first bonding member  71  may couple the middle mold  240  to the diffuser plate  63  by bonding the sheet bonding surface  242  and the rear surface  63   a  of the diffuser plate  63 . The first bonding member  71  may include a pressure sensitive bonding member (PSA) or an optical clear bonding member (OCA). 
     In the embodiment of the disclosure, the liquid crystal panel  10  may be fixedly coupled to the diffuser plate  63 . The second bonding member  72  may be provided between the liquid crystal panel  10  and the diffuser plate  63  to bond the liquid crystal panel  10  and the diffuser plate  63 . Accordingly, the liquid crystal panel  10  may be fixedly coupled to the diffuser plate  63 . The second bonding member  72  may include UV resin. 
     Although not shown, the liquid crystal panel  10  may be coupled to the first optical sheet  61 . In this case, the second bonding member  72  may be arranged between the liquid crystal panel  10  and the first optical sheet  61 . 
     In the embodiment of the disclosure, the liquid crystal panel  10  and the diffuser plate  63  may be coupled by the second bonding member  72  without an extra structure. 
     In the conventional display, an bonding member may be provided on a structure arranged at e.g., the front chassis to couple the liquid crystal panel to the front chassis. In such a method, it is difficult to form a liquid crystal panel supporting structure corresponding to the size of a black material (BM) of the ever decreasing liquid crystal panel. 
     In the embodiment of the disclosure, the second bonding member  72  may be placed in a size corresponding to the BM of the liquid crystal panel. Accordingly, even when the BM of the liquid crystal panel becomes smaller, the liquid crystal panel  10  may be stably coupled to the diffuser plate  63  or the first optical sheet  61  accordingly. 
       FIG. 7  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
     In the embodiment of the disclosure, the liquid crystal panel  10  may be fixedly coupled to a middle mold  340 . 
     The middle mold  340  may include the supporting projection  343  protruding toward the liquid crystal panel  10 . The supporting projection  343  may include a panel bonding surface  343   a  facing the rear surface of the liquid crystal panel  10 . The second bonding member  72  may be provided between the panel bonding surface  343   a  and the rear surface of the liquid crystal panel  10 . The second bonding member  72  may be provided to bond the panel bonding surface  343   a  of the middle mold  340  and the rear surface of the liquid crystal panel  10 . With the second bonding member  72 , the liquid crystal panel  10  may be fixedly coupled to the middle mold  340 . The second bonding member  72  may include UV resin. 
     In the embodiment of the disclosure, the middle mold  340  may include the first sheet bonding surface  342   a  and the second sheet bonding surface  342   b.    
     The first bonding surface  342   a  may be arranged to face the rear surface  63   a  of the diffuser plate  63 , and an bonding member 1a  71   a  may be placed between the first sheet bonding surface  342   a  and the rear surface  63   a  of the diffuser plate  63  (see  FIG. 4 ). 
     The second sheet bonding surface  342   b  may be arranged to face the side of the diffuser plate  63 . An bonding member 1b  71   b  may be provided between the second sheet bonding surface  342  and the side of the diffuser plate  63 . 
     The bonding member 1a  71   a  and the bonding member 1b  71   b  may include an PSA and an OCA. 
     In the embodiment of the disclosure, the sheet bonding surface may be double-sided to relatively strengthen adhesive power between the diffuser plate and the middle mold. Accordingly, the diffuser plate and the middle mold may be more stably coupled. 
       FIG. 8  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
     In the embodiment of the disclosure, a display apparatus may include a liquid crystal panel  10  for displaying an image, a backlight unit arranged behind the liquid crystal panel  10  to provide light to the liquid crystal panel  10 , a rear chassis  30  for supporting the backlight unit, a front chassis  420  for covering edges of the liquid crystal panel  10 , and a middle mold  40  coupled between the front chassis  420  and the rear chassis  30 . 
     In the embodiment of the disclosure, all the components but the front chassis  420  are the same as those shown in  FIG. 4 , so the overlapping description will not be repeated. 
     In the embodiment of the disclosure, the front chassis  420  may be provided to cover the sides of the liquid crystal panel  10  and the middle mold  40 . 
     The front chassis  420  may be fixedly coupled to the sides of the liquid crystal panel  10 . Furthermore, the front chassis  420  may be fixedly coupled to the sides of the middle mold  40 . 
     A gap may be formed between the front chassis  420  and the liquid crystal panel  10 , and similarly, there may be a gap formed between the front chassis  420  and the middle mold  40 . A third bonding member  73  may be provided in the gap. 
     The third bonding member  73  may bond the front chassis  420  and the liquid crystal panel  10 . Furthermore, the third bonding member  73  may bond the middle mold  40  and the front chassis  420 . 
     With the third bonding member  73 , the front chassis  420  may be fixedly coupled to the middle mold  40  and further to the liquid crystal panel  10 . The front chassis  420  may be coupled to the sides of the liquid crystal panel  10  and the middle mold  40  to prevent external foreign materials from being brought into the liquid crystal panel  10  or the middle mold  40 . 
     In the embodiment of the disclosure, the front chassis  420  may be coupled to the sides of the liquid crystal panel  10  and the middle mold  40  by the third bonding member  73  without an extra fastening member. Accordingly, the front chassis  420  may not include the extra fastening member, and may thus have slim thickness as compared to a case of having a fastening member. 
     The front chassis  30  and the middle mold  40  may be coupled by the fastening member S. The fastening member S may pass through the first fastening hole  35  of the rear chassis  30  to be coupled to the fastening groove  46  of the middle mold  40 . 
       FIG. 9  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
     In the embodiment of the disclosure, the middle mold  140  may include the supporting projection  143 , which may include the light reflecting plane  143   b.    
     The light reflecting plane  143   b  may prevent portions of the edges of the liquid crystal panel  10  from having excessively high brightness. The light reflecting plane  143   b  may reduce an amount of light emitted through the edges of the liquid crystal panel  10  by reflecting the light backward. This may prevent relative increase of brightness of the portions of the edges of the liquid crystal panel  10 , and accordingly, the liquid crystal panel  10  may have uniform brightness across the entire area. 
     Furthermore, the front chassis  420  may be coupled to the side of the liquid crystal panel  10  and the side of the middle mold  140  by the third bonding member  73  without an extra fastening member. Accordingly, the front chassis  420  may not include the extra fastening member, and may thus have slim thickness as compared to a case of having a fastening member. 
     The front chassis  230  and the middle mold  240  may be coupled by the fastening member S. The fastening member S may pass through the first fastening hole  235  of the rear chassis  30  to be coupled to the fastening groove  243  of the middle mold  240 . 
       FIG. 10  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
     In the embodiment of the disclosure, the light source module  250  may not include a lens. Accordingly, a least distance required between the light source and the diffuser plate may be reduced as compared with an occasion when the lens is provided. Furthermore, a distance between a base  231  of the rear chassis  230  and the liquid crystal panel  10  may be reduced. With the reduced distance between the base  231  and the liquid crystal panel  10 , thickness of the display apparatus from front to back may be reduced. With the reduced thickness of the display apparatus, the display apparatus may give an enhanced aesthetic impression. 
     In the embodiment of the disclosure, the middle mold  240  may include the sheet bonding surface  242 . No projection may be provided on the sheet bonding surface  242 . The first bonding member  71  may be provided between the sheet bonding surface  242  and the rear surface  63   a  of the diffuser plate  63 . The first bonding member  71  may couple the middle mold  240  to the diffuser plate  63  by bonding the sheet bonding surface  242  and the rear surface  63   a  of the diffuser plate  63 . The first bonding member  71  may include a pressure sensitive bonding member (PSA) or an optical clear bonding member (OCA). 
     In the embodiment of the disclosure, the liquid crystal panel  10  may be fixedly coupled to the diffuser plate  63 . The second bonding member  72  may be provided between the liquid crystal panel  10  and the diffuser plate  63  to bond the liquid crystal panel  10  and the diffuser plate  63 . Accordingly, the liquid crystal panel  10  may be fixedly coupled to the diffuser plate  63 . The second bonding member  72  may include UV resin. 
     Although not shown, the liquid crystal panel  10  may be coupled to the first optical sheet  61 . In this case, the second bonding member  72  may be arranged between the liquid crystal panel  10  and the first optical sheet  61 . 
     In the embodiment of the disclosure, the liquid crystal panel  10  and the diffuser plate  63  may be coupled by the second bonding member  72  without an extra structure. 
     In the conventional display, an bonding member may be provided on a structure arranged at e.g., the front chassis to couple the liquid crystal panel to the front chassis. In such a method, it is difficult to form a liquid crystal panel supporting structure corresponding to the size of a black material (BM) of the ever decreasing liquid crystal panel. 
     In the embodiment of the disclosure, the second bonding member  72  may be placed in a size corresponding to the BM of the liquid crystal panel. Accordingly, even when the BM of the liquid crystal panel becomes smaller, the liquid crystal panel  10  may be stably coupled to the diffuser plate  63  or the first optical sheet  61  accordingly. 
     In the embodiment of the disclosure, the front chassis  420  may be coupled to the sides of the liquid crystal panel  10  by the third bonding member  73 . Furthermore, the front chassis  420  may be coupled to the sides of the diffuser plate  63  by the third bonding member  73 . Furthermore, the front chassis  420  may be coupled to the middle mold  240  by the third bonding member  73 . The front chassis  420  may be coupled to the liquid crystal panel  63 , the diffuser plate  63 , and the middle mold  240  without an extra fastening member. The front chassis  420  may not include the extra fastening member, and may thus have slim thickness as compared to a case of having a fastening member. 
     The front chassis  230  and the middle mold  340  may be coupled by the fastening member S. The fastening member S may pass through the first fastening hole  235  of the rear chassis  30  to be coupled to the fastening groove  243  of the middle mold  240 . 
       FIG. 11  is a side cross-sectional view of a display apparatus, according to another embodiment of the disclosure. 
     In the embodiment of the disclosure, the liquid crystal panel  10  may be fixedly coupled to a middle mold  340 . 
     The middle mold  340  may include the supporting projection  343  protruding toward the liquid crystal panel  10 . The supporting projection  343  may include a panel bonding surface  343   a  facing the rear surface of the liquid crystal panel  10 . The second bonding member  72  may be provided between the panel bonding surface  343   a  and the rear surface of the liquid crystal panel  10 . The second bonding member  72  may be provided to bond the panel bonding surface  343   a  of the middle mold  340  and the rear surface of the liquid crystal panel  10 . With the second bonding member  72 , the liquid crystal panel  10  may be fixedly coupled to the middle mold  340 . The second bonding member  72  may include UV resin. 
     In the embodiment of the disclosure, the middle mold  340  may include the first sheet bonding surface  342   a  and the second sheet bonding surface  342   b.    
     The first bonding surface  342   a  may be arranged to face the rear surface  63   a  of the diffuser plate  63  (see  FIG. 4 ), and the bonding member 1a  71   a  may be placed between the first sheet bonding surface  342   a  and the rear surface  63   a  of the diffuser plate  63 . 
     The second sheet bonding surface  342   b  may be arranged to face sides  63   c  of the diffuser plate  63 . The bonding member 1b  71   b  may be provided between the second sheet bonding surface  342  and the side  63   c  of the diffuser plate  63 . 
     The bonding member 1a  71   a  and the bonding member 1b  71   b  may include an PSA and an OCA. 
     In the embodiment of the disclosure, the sheet bonding surface may be double-sided to relatively strengthen adhesive power between the diffuser plate and the middle mold. Accordingly, the diffuser plate and the middle mold may be more stably coupled. 
     In the embodiment of the disclosure, the front chassis  420  may be coupled to the sides of the liquid crystal panel  10  by the third bonding member  73 . Furthermore, the front chassis  420  may be coupled to the middle mold  340  by the third bonding member  73 . The front chassis  420  may be coupled to the liquid crystal panel  63  and the middle mold  340  without an extra fastening member. The front chassis  420  may not include the extra fastening member, and may thus have slim thickness as compared to a case of having a fastening member. 
     In the embodiment of the disclosure, the front chassis  420  may be coupled to the sides of the liquid crystal panel  10  and the sides of the middle mold  340  by the third bonding member  73  without an extra fastening member. Accordingly, the front chassis  420  may not include the extra fastening member, and may thus have slim thickness as compared to a case of having a fastening member. 
     The front chassis  230  and the middle mold  340  may be coupled by the fastening member S. The fastening member S may pass through the first fastening hole  235  of the rear chassis  30  to be coupled to the fastening groove  344  of the middle mold  340 . 
       FIG. 12  is a rear perspective view of a display apparatus, according to an embodiment of the disclosure.  FIG. 13  is an enlarged view of portion A of  FIG. 12 .  FIG. 14  illustrates a front chassis decoupled from what is shown in  FIG. 13 . 
     Referring to  FIGS. 12 to 14 , in an embodiment of the disclosure, a display apparatus may include the light source module  50  installed therein, and the rear chassis  30  which covers the rear side of the light source module  50  and defines the rear side of the display apparatus. 
     In the embodiment of the disclosure, as described above, the liquid crystal panel  10  may be bonded to the middle mold  40  by the second bonding member  72 . The optical members  61 ,  62  and  63  arranged to come into contact with the rear surface of the liquid crystal panel  10  may be bonded to the middle mold  40  by the first bonding member  71 . This was described above, so the overlapping description will not be repeated. 
     According to the disclosure, the liquid crystal panel  10  may be bonded to the middle mold  40  or the first optical sheet  61 , and the optical members  61 ,  62  and  63  may be bonded to the middle mold  40 . Such bonding of the liquid crystal panel  10  to the middle mold  40  or the first optical sheet  61  may be irreversible. Similarly, the bonding of the optical members  61 ,  62  and  63  to the middle mold  40  may be irreversible. 
     In the case that the bonding of the liquid crystal panel  10  to the middle mold  40  or the first optical sheet  61  is irreversible, it is not possible to detach the liquid crystal panel  10  from the front of the display apparatus  1 . It is because the liquid crystal panel  10  is very likely to be damaged in the process of decoupling of the liquid crystal panel  10 . 
     For various reasons, internal parts of the display apparatus, i.e., the light source module  50 , needs to be accessed. For example, when a portion of the light source module  50  is to be replaced or a foreign material is brought into the display device, there is a need for a structure in which the light source module  50  is detachable from the display apparatus. 
     As described above, when the liquid crystal panel  10  is bonded to the middle mold  40  or the optical members  61 ,  62 , and  63  and this bonding is irreversible, it is difficult to access the light source module  50  by detaching the liquid crystal panel  10  from the front of the display apparatus. 
     According to the disclosure, the light source module  50  and the rear chassis  30  at which the light source module  50  is installed may be decoupled from behind the display apparatus  1 . 
     Referring to  FIG. 13 , at least a portion of the front chassis  20  may be placed on the rear side of the display apparatus  1 . A fixing hole  23  (see  FIG. 15 ) may be formed at the front chassis  20  to fasten the front chassis  20  to the rear chassis  30  and/or the middle mold  40 . A first fastening member  110  may be inserted to the fixing hole  23 . 
     The first fastening member  110  may include a first fastening portion  111  having a diameter smaller than a diameter of the fixing hole  23  to pass through the fixing hole  23 , and a first head portion  112  having a diameter larger than the diameter of the fixing hole  23  not to pass the fixing hole  23 . 
     As shown in  FIG. 13 , the first head portion  112  may be placed outside the fixing hole  23 , i.e., on the outside of the front chassis  20 . With various tools not shown in the drawings, the user may detach the first fastening member  110  exposed on the rear side of the display apparatus from behind the display apparatus. 
     Referring to  FIG. 14 , the front chassis  20  may be decoupled from the display apparatus by detaching the first fastening member  110 . As the front chassis  20  is coupled to the rear chassis  30  and the middle mold  40  by the first fastening member  110 , decoupling of the first fastening member  110  may allow the front chassis  20  to be decoupled from the rear chassis  30  and the middle mold  40 .  FIG. 14  illustrates decoupling of the front chassis  20 . 
     Referring to  FIG. 14 , a fastening hole  35  may be formed at the rear chassis  30 , and the second fastening member  120  may be coupled to the fastening hole  35 . 
     The second fastening member  120  may include a second fastening portion  121  having a diameter smaller than a diameter of the fastening hole  35  to pass through the fastening hole  35 , and a second head portion  122  having a diameter larger than the diameter of the fastening hole  35  not to pass the fastening hole  35 . 
     As shown in  FIGS. 13 and 14 , even when the front chassis  20  is decoupled from the display apparatus by detaching the first fastening member  110 , the rear chassis  30  may still be in a state of being coupled to the middle mold  40 . The second fastening member  120  may pass through the fastening hole  35  formed at the rear chassis  30  to be coupled to the fastening groove  46  of the middle mold  40 . As the second fastening member  120  couples the rear chassis  30  to the middle mold  40 , the rear chassis  30  may be coupled to the middle mold  40  even when the first fastening member  110  and the front chassis  20  are decoupled. Hence, to detach the rear chassis  30  and the light source module  50  installed at the rear chassis  30  from the middle mold  40 , not only the first fastening member  110  but also the second fastening member  120  need to be decoupled. 
       FIG. 15  is a cross-sectional view along line A-A′ of  FIG. 12 .  FIG. 16  is a cross-sectional view along line C-C′ of  FIG. 13 .  FIG. 17  is a cross-sectional view along line B-B′ of  FIG. 12 .  FIG. 18  is a cross-sectional view along line D-D′ of  FIG. 13 .  FIG. 19  illustrates decoupling of a rear chassis and a light source module from what is shown in  FIG. 18 . 
     Referring to  FIGS. 15 to 19 , the coupling structure of the disclosure will be described in detail. 
     Referring to  FIGS. 15 and 19 , the rear chassis  30  may include a fastening hole  35 . The fastening hole  35  may include a first fastening hole  35   a  matching the fastening groove  46  and the fixing hole  23 . The fastening hole  35  may include a second fastening hole  35   b  matching the fastening groove  46  and covered by the front chassis  20 . 
     The fastening member may include the first fastening member  110  arranged to pass through the fixing hole  23  and the first fastening hole  35   a  to be inserted to the fastening groove  46 , and the second fastening member  120  arranged to pass through the second fastening hole  35   b  to be inserted to the fastening groove  46 . 
     The first fastening member  110  may be placed such that the first head portion  112  is placed on the outside of the front chassis  20 , as described above. The first head portion  112  may then be exposed on the rear side of the display apparatus so that the user may have access to the first fastening member  110  without any particular measure. Accordingly, the first fastening member  110  may be decoupled from the display apparatus  1 . 
     Once the first fastening member  110  is decoupled, constraints on the front chassis  20  may be removed. As shown in  FIG. 16 , decoupling of the first fastening member  110  may allow the front chassis  20  to be decoupled from the display apparatus  1 . 
     Referring to  FIG. 17 , the second head portion  122  of the second fastening member  120  may be covered by the front chassis  20 . The second head portion  122  may be arranged between the rear chassis  30  and the front chassis  20 . As the second head portion  122  is covered by the front chassis  20 , the second fastening member  120  may not be exposed to the outside before the front chassis  20  is decoupled from the display apparatus  1 . This is to prevent the user from detaching the second fastening member  120  before the first fastening member  110 . When the first fastening member  110  is detached after the second fastening member  120  is detached first, the rear chassis  30  and the front chassis  20  may be simultaneously decoupled from the display apparatus  1 . In this process, the rear chassis  30  and the light source module  50  mounted on the rear chassis  30  might fall to the ground and might be broken. Hence, it is desirable that the front chassis  20  covers the second fastening member  120 , without being limited thereto. 
     Referring to  FIG. 18 , even when the first fastening member  110  and the front chassis  20  are detached, the rear chassis  30  may still be in a state of being coupled to the middle mold  40 . It is because the second fastening member  120  couples the rear chassis  30  to the middle mold  40 . 
     Referring to  FIG. 19 , the rear chassis  30  and the light source module  50  installed at the rear chassis  30  may be decoupled from behind the display apparatus  1  by detaching the second fastening member  120 . As described above, in a case of having a structure difficult to detach the liquid crystal panel  10  from the front, the light source module  50  may be accessed from behind the display apparatus  1  by detaching the first fastening member  110  and the second fastening member  120 . 
     The detached light source module  50  may be reassembled in the opposite order of the aforementioned procedure, and it is advantageous that the light source module  50  may be replaced or internal parts of the display apparatus  1  may be accessed without forcing to remove the bonding members  71  and  72 . 
     In  FIGS. 15 to 19 , the second bonding member  72  is shown as being arranged between the middle mold  40  and the liquid crystal panel  10  for example, but it is not limited thereto. The aforementioned coupling and decoupling structures may be applied to the various embodiments shown in  FIGS. 3 to 7 . 
       FIG. 20  is a cross-sectional view of a display apparatus, according to another embodiment of the disclosure.  FIG. 21  illustrates decoupling of a rear chassis and a light source module from what is shown in  FIG. 20 . 
     Referring to  FIGS. 20 and 21 , the front chassis  420  may not be coupled to the rear chassis  30  and the middle mold  40  by the fastening member  100 . The front chassis  420  may be coupled to the side of the middle mold  40  by the third bonding member  73 . Coupling between the front chassis  420  and the middle mold  40  by the third bonding member  73  may be irreversible. In this case, the rear chassis  30  and the light source module  50  installed at the rear chassis  30  may be decoupled from behind the display apparatus  1  by detaching the fastening member  100  from the rear chassis  30 . Even when the rear chassis  30  and the light source module  50  are detached, the front chassis  420  may not be decoupled from the middle mold  40  but coupled to the middle mold  40 . 
     In another embodiment of the disclosure, the rear chassis  30  and the light source module  50  may be decoupled from behind the display apparatus without detaching the front chassis  420 . 
     Furthermore, in  FIGS. 20 and 21 , the second bonding member  72  is shown as being arranged between the middle mold  40  and the liquid crystal panel  10  for example, but it is not limited thereto. The aforementioned coupling and decoupling structures may be applied to the various embodiments shown in  FIGS. 8 to 11 . 
     Several embodiments of the disclosure have been described above, but a person of ordinary skill in the art will understand and appreciate that various modifications can be made without departing from the scope of the disclosure. Thus, it will be apparent to those or ordinary skill in the art that the true scope of technical protection is only defined by the following claims.