Patent Publication Number: US-2007103386-A1

Title: Display device assembling method and display device

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to an assembling method of a display device which constitutes a display screen using a plurality of display modules, and a display device which constitutes a display screen using a plurality of display modules, and more particularly to an assembling method of a display device which is preferably used outdoors and such a display device.  
      2. Description of the Related Art  
      With respect to a display device such as conventional live broadcasting large-sized outdoor display device or an advertisement large-sized display device, for example, as described in JP-A-4-110992, JP-A-2004-341468 and the like, a display screen is constituted of a plurality of display modules.  
      Although the whole constitutions of these structures are not shown in these publications, the typical whole constitution of the structure of the display device used outdoors such as the live broadcasting large-sized outdoor display device, the advertisement large-sized display device or the like, is shown in  FIG. 22 , for example.  
       FIG. 22  shows an example of the conventional typical large-sized display device as a right side view. As shown in the drawing, the conventional typical large-sized display device has, in general, the structure in which in the inside of a waterproof outer casing  1   c  having the waterproof structure, a large number of support columns  1   d , a large number of display modules xx which are mounted on the large number of support columns  1   d , a display controller  2  which controls a screen display on the whole display screen which is constituted of the large number of display modules xx, a power source for these parts (omitted from the drawing) and the like are incorporated.  
      Further, in the conventional typical large-sized display device, the weight support structure is, as can be estimated also from  FIG. 22 , the self-completing or self-standing structure in which the waterproof outer casing  1   c  receives all weights consisting of the total weight of the large number of support columns  1   d , the total weight of the large number of display modules xx, the total weight of electric circuit constituting parts such as the display controller  2 , the power source, various cables for electric power/control signals, and the weight of the waterproof outer casing  1   c  per se.  
      In the conventional large-sized display device, the weight support structure, as illustrated in  FIG. 22 , is the self-completing or self-standing structure in which the waterproof outer casing  1   c  receives all weights consisting of the total weight of the large number of support columns  1   d , the total weight of the large number of display modules xx, the total weight of electric circuit constituting parts such as the display controller  2 , the power source, various cables for electric power/control signals, and the weight of the waterproof outer casing  1   c  per se. Accordingly, the weight support structure has an advantage that the sufficient waterproof structure is applied to the electronic equipment in the inside of the structure and hence, the weight support structure can be installed in any arbitrary environment. On the other hand, the waterproof outer casing  1   c  per se is required to possess the sufficient strength and reliability thus pushing up a weight and a manufacturing cost of the whole display device.  
     SUMMARY OF THE INVENTION  
      The present invention has been made in view of the above-mentioned circumstances and it is an object of the present invention to reduce a weight and a manufacturing cost of a display device per se.  
      The present invention is directed to an assembling method of a display device which constitutes a display screen using a plurality of display modules, wherein the display device is assembled by a waterproof frame mounting step which mounts a waterproof frame on a display device mounting structure, and a display screen assembling step which assembles the display screen whose periphery is covered with the waterproof frame mounted on the display device mounting structure using a plurality of display modules. Here, since a weight of the waterproof frame of the display device is received by the display device mounting structure, and a weight of the plurality of display modules which constitute the display screen is also received by the display device mounting structure and hence, a weight resistance strength of the display device per se can be reduced thus realizing the reduction of weight and the lowering of manufacturing cost of the display device per se.  
      Further, the present invention is directed to an assembling method of a display device which constitutes a display screen using a plurality of display modules, wherein the display device is assembled by a module mounting frame mounting step which mounts a module mounting frame on a display device mounting structure, a display module mounting step which mounts the display modules on the module mounting frame, and a display screen constituting step which constitutes the display screen using the plurality of display modules by exercising the display module mounting step plural times. Here, a weight of the module mounting frame of the display device is received by the display device mounting structure, and a weight of the plurality of display modules which constitute the display screen is also received by the display device mounting structure by way of the module mounting frame and hence, a weight resistance strength of the display device per se can be reduced thus realizing the reduction of the weight and the lowering of the manufacturing cost of the display device per se.  
      Further, the present invention is directed to a display device which includes at least one module mounting frame which is mounted on a display device mounting structure, a plurality of display modules which are detachably mounted on the module mounting frame and constitute a display screen, a signal cable which has a wiring route in the inside of the module mounting frame and is detachably connected to the display modules and supplies image signals to the display modules, and a power source cable which has a wiring route in the inside of the module mounting frame and is detachably connected to the display modules thus supplying electric power to the display modules. Due to such a constitution, it is possible to realize the reduction of weight, the lowering of the manufacturing cost and the waterproof of the display device per se.  
      The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. 
    
    
     BRIEF EXPLANATION OF DRAWINGS  
       FIG. 1  is a view showing an embodiment 1 of the present invention and is a block diagram showing an example of the system constitution of a display system which allows a large-sized display device to perform a display;  
       FIG. 2  is a view showing the embodiment 1 of the present invention and also is a view showing an example of the constitution of a display module which is a constitutional element which constitutes a display screen of the large-sized display device;  
       FIG. 3A  and  FIG. 3B  are views showing the embodiment 1 of the present invention and also are views which schematically show an example of a state in which the large-sized display device is mounted on a display device mounting structure, wherein  FIG. 3A  is a front view and  FIG. 3B  is a right side view;  
       FIG. 4  is a view showing the embodiment 1 of the present invention and also is a longitudinal cross-sectional right side view with a part in cross section showing a cross section of a part in an enlarged manner for explaining an example of an assembling method of the large-sized display device on the display device mounting structure;  
       FIG. 5  is a view showing the embodiment 1 of the present invention and also is a longitudinal cross-sectional right side view with a part in cross section showing a cross section of a part in an enlarged manner for showing an example of an assembling completion state of the large-sized display device on the display device mounting structure;  
       FIG. 6A  and  FIG. 6B  are views showing the embodiment 1 of the present invention and are also views showing an example of a state before display modules are assembled in the large-sized display device, wherein  FIG. 6A  is a front view and  FIG. 6B  is a right side view;  
       FIG. 7A  and  FIG. 7B  are views showing the embodiment 1 of the present invention and are also views showing an example of a state after display modules are assembled in the large-sized display device, wherein  FIG. 7A  is a front view and  FIG. 7B  is a right side view;  
       FIG. 8  is a view showing the embodiment 1 of the present invention and is also a longitudinal cross-sectional right side view with a part in cross section which shows a portion in cross section by enlarging the example of the state before the display modules are assembled in the large-sized display device;  
       FIG. 9  is a view showing the embodiment 1 of the present invention and is also a longitudinal cross-sectional right side view with a part in cross section which shows a portion in cross section by enlarging the example of the state after the display modules are assembled in the large-sized display device;  
       FIG. 10  is a view showing the embodiment 1 of the present invention and is also a longitudinal cross-sectional front view in a state that a cross section taken along a line X-X in  FIG. 8  is viewed in the direction of an arrow;  
       FIG. 11  is a view showing an embodiment 2 of the present invention and also is a front view showing another example of the state before the display modules are assembled in the large-sized display device;  
       FIG. 12  is a view showing an embodiment 3 of the present invention and also is a front view showing still another example of the state before the display modules are assembled in the large-sized display device;  
       FIG. 13  is a view showing an embodiment 4 of the present invention and also is a front view showing still another example of the state before the display modules are assembled in the large-sized display device;  
       FIG. 14  is a view showing an embodiment 5 of the present invention and also is a back view showing another example of a state in which the large-sized display device is mounted on the display device mounting structure;  
       FIG. 15  is a view showing an embodiment 6 of the present invention and also is a front view showing still another example of the state in which the large-sized display device is mounted on the display device mounting structure;  
       FIG. 16  is a view showing an embodiment 7 of the present invention and is also a partially longitudinal cross-sectional right side view showing a part in cross section of still another example of a state in which the large-sized display device is mounted on the display device mounting structure;  
       FIG. 17  is a view showing an embodiment 8 of the present invention and is also a right side view showing another example of the display modules which are constitutional elements constituting a display screen;  
       FIG. 18  is a view showing an embodiment 9 of the present invention and is also a block diagram showing another example of the system constitution of a display system which allows the large-sized display device to perform a display;  
       FIG. 19  is a view showing an embodiment 10 of the present invention and also is a longitudinal cross-sectional right side view with a part in cross section showing a part in cross section by enlarging an example of a display module fixing means particularly in a state before the display modules are assembled in the large-sized display device;  
       FIG. 20  is a view showing an embodiment 11 of the present invention and also is a longitudinal cross-sectional right side view with a part in cross section showing a part in cross section by further enlarging an example of a display module fixing means particularly in a state before the display modules are assembled in the large-sized display device;  
       FIG. 21A ,  FIG. 21B  and  FIG. 21C  are views showing an embodiment 12 of the present invention and also are exploded of an example of another large-sized display device, wherein  FIG. 21A  is a front view showing a state in which a waterproof frame is disassembled,  FIG. 21B  is a front view of a display screen portion, and  FIG. 21C  is a front view sowing a state in which the waterproof frame is assembled to an outer periphery of the display screen portion; and  
       FIG. 22  is a right side view showing an example of a conventional typical large-sized display device. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
     Embodiment 1  
      Hereinafter, an embodiment 1 of the present invention is explained in conjunction with  FIG. 1  to  FIG. 10 .  FIG. 1  is a block diagram showing an example of the system constitution of a display system which allows a large-sized display device to perform a display,  FIG. 2  is a view showing an example of the constitution of a display module which is a constitutional element which constitutes a display screen of the large-sized display device,  FIG. 3A  and  FIG. 3B  are views which schematically show an example of a state in which the large-sized display device is mounted on a display device mounting structure, wherein  FIG. 3A  is a front view and  FIG. 3B  is a right side view,  FIG. 4  is a longitudinal cross-sectional right side view with a part in cross section showing a cross section of a part in an enlarged manner for explaining an example of an assembling method of the large-sized display device on the display device mounting structure,  FIG. 5  is a longitudinal cross-sectional right side view with a part in cross section showing a cross section of a part in an enlarged manner for showing an example of an assembling completion state of the large-sized display device on the display device mounting structure,  FIG. 6A  and  FIG. 6B  are views showing an example of a state before display modules are assembled in the large-sized display device, wherein  FIG. 6A  is a front view and  FIG. 6B  is a right side view,  FIG. 7A  and  FIG. 7B  are views showing an example of a state after display modules are assembled in the large-sized display device, wherein  FIG. 7A  is a front view and  FIG. 7B  is a right side view,  FIG. 8  is a longitudinal cross-sectional right side view with a part in cross section which shows a portion in cross section by enlarging the example of the state before the display modules are assembled in the large-sized display device,  FIG. 9  is a longitudinal cross-sectional right side view with a part in cross section which shows a portion in cross section by enlarging the example of the state after the display modules are assembled in the large-sized display device, and  FIG. 10  is a longitudinal cross-sectional front view in a state that a cross section taken along a line X-X in  FIG. 8  is viewed in the direction of an arrow. In these drawings, same symbols indicate identical portions.  
      Hereinafter, the embodiment is explained in order of these drawings.  
      A display system which allows a large-sized display device used in the embodiment 1 of the present invention to perform a display is not a particular system and is a display system which has been used generally conventionally for allowing a large-sized display device whose display screen is constituted of a plurality of display modules such as a live broadcasting large-sized outdoor display device, an advertisement large-sized display device or the like to perform a display can be used. With respect to the display system which has been generally used conventionally, various systems have been considered specifically. As the system constitution of one example out of these respective systems, an example of the display system in the embodiment 1 of the present invention is shown in  FIG. 1 .  
      With respect to the display system shown in  FIG. 1 , as illustrated in the drawing, in the display device  1 , a display screen  10  is, as is well known, constituted by arranging a large number of display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn in a matrix array, that is, in the row direction (lateral direction) and in the column direction (longitudinal direction).  
      In the display device  1  having such a constitution, as is well known, an image display control signal and an image information signal are supplied from a display controller  2  by way of buffer memories  31 ,  32 , . . .  3   n  formed for every row.  
      The above-mentioned display controller  2  possesses, as is well known, a function  21  of TV (television) signal processing which processes image information from a video system  4 , a function  22  of graphic processing which processes image information from a computer system  5 , and a function  23  of character information processing which processes character information from the computer system  5 . As is well known, the controller  2 , based on information from the video system  4  and information from the computer system  5 , supplies predetermined image display control signals and image information signals to the display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn of the display device  1  so as to allow the whole display screen  10  to display a predetermined image such as a live broadcasting image or an advertisement image (containing characters).  
      As the display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn, a display module xx having the same constitution is used. For example, as shown in  FIG. 2  which shows one example of the well-known constitution, the display module xx is constituted of a display device xx 1  which is constituted of a plurality of pixels, a drive circuit xx 2  which drives the display device xx 1 , an image memory xx 3  which temporarily or fixedly stores information on images displayed on the display device xx 1 , a control circuit xx 4  which allows the display device xx 1  to display predetermined images, and a power source xx 5 .  
      Further, the drive circuit xx 2 , the image memory xx 3  and the control circuit xx 4  are formed on a common substrate xxb, and are mounted on a back surface side of the display device xx 1  as the waterproof structure (see  FIG. 8  and  FIG. 9  described later).  
      The display device xx 1  is a well-known display device. With respect to the display device, originally, a system which arranges cathode ray tubes (CRT) of single color is put into practice. Thereafter, by applying principles of a CRT and a discharge tube, a display device which arranges a plurality of pixels in the inside of the display device xx 1  is developed and hence, the resolution is remarkably improved. A system which arranges LCD (liquid crystal) is put into practice, and a system which arranges a PDP (plasma display play) or a VFD (phosphorus display tube) is manufactured on a trial basis. In this manner, it becomes possible to use various kinds of display devices xx 1  for the large-sized display device application. Recently, the system which arranges LED (light emitting diodes) becomes a main stream, while the large-sized display device copes with various applications such as the indoor high-resolution application, the outdoor ultra brightness application, the light-weighted and thin building wall surface application and the like. When the LED is used, a plurality of LED is arranged thus forming the display module xx having the panel-like constitution.  
      In each display module  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn, a portion of the image which is allocated corresponding to a size of the module is displayed thus displaying one image as a whole on the display screen  10 . Accordingly, when the display screen  10  is observed from a front side of the display screen  10 , the respective display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn are arranged relatively close to each other to prevent the clearance between the respective display modules, that is, to prevent the clearance between the display devices xx 1  from becoming apparent like tile joints.  
      The power source xx 5  may be arranged outside the display module xx in place of arranging the power source xx 5  inside the display module xx. Further, the power source xx 5  supplies electric power to the display device xx 1 , the drive circuit xx 2 , the image memory xx 3  and the control circuit xx 4 .  
       FIG. 3  shows a state in which the display device  1  is mounted on the display device mounting structure  6 .  
      In the embodiment 1 of the present invention, the display device mounting structure  6  is an existing mounting base and is constituted of a fixed leg portion  61 , a base plate  62  mounted on the leg portion  61 , and a plurality of support struts  63 ,  63 ,  63  which are mounted in an erected manner on the base plate  62  in a spaced-apart manner. Then, the display device  1  is mounted on the plurality of support struts  63 ,  63 ,  63 .  
      In the display device  1 , as described above, the display screen  10  is constituted of the large number of display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn which are arranged in a matrix array as described above. The display screen  10  which is constituted of the large number of display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn which are arranged in a matrix array is mounted on the display device mounting structure  6  by way of a waterproof frame  1   f.    
      The detailed structure of  FIG. 3B  is indicated in  FIG. 5  which is an enlarged view.  FIG. 5  is a view showing a result of assembling and an assembling step is shown in  FIG. 4 .  
      In  FIG. 3 ,  FIG. 4  and  FIG. 5 , the waterproof frame  1   f  of the display device  1  is constituted of a back plate  1   f   1  having a rectangular shape as viewed from a front side and a waterproof frame body  1   f   2  which is integrally mounted on the whole periphery of the back plate  1   f   1  in a picture-frame-like shape.  
      Here,  FIG. 4  which is the view showing the assembling step, the waterproof frame  1   f  is mounted on the support struts  63 ,  63 ,  63  of the display device mounting structure  6  using general mounting means such as screwing using bolts or the like. This step is a waterproof frame mounting step which mounts the waterproof frame if on the display device mounting structure  6 .  
      After mounting the waterproof frame  1   f  on the display device mounting structure  6  (that is, after the above-mentioned waterproof frame mounting step), on a front side of the back plate  1   f   1  of the waterproof frame  1   f , a module mounting frame  100  having a grid shape as viewed from a front side is mounted by screwing or using other general mounting means. After mounting the module mounting frame  100  on the waterproof frame  1   f , the large number of display modules xx (see  FIG. 2 ) are sequentially mounted on the module mounting frame  100  which is mounted on the waterproof frame  1   f  as indicated by an arrow thus assembling the display screen  10  which is constituted of the display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn arranged in a matrix array. This step is referred to as a display screen assembling step in which the display screen  10  which has the periphery thereof covered with the waterproof frame if mounted on the display device mounting structure  6  is assembled using the plurality of display modules xx (see  FIG. 2 ).  
      The result of the completion of this display screen assembling step is shown in  FIG. 5 .  
      As shown in  FIG. 5 , in a state that the display screen assembling step is completed, the relationship between a thickness T 1  in the depth direction (longitudinal direction as viewed from the front side) of the waterproof frame body  1   f   2  and a total thickness T 2  in the above-mentioned depth direction of the module mounting frame  100 , the display module xx and the back plate  1   f   1  which are assembled in the above-mentioned manner is set as T 1 &gt;T 2 . That is, as shown in the drawing, this embodiment adopts the structure in which the waterproof frame body  1   f   2  projects toward the front side from a front-side surface of the display screen  10  by a size T 12 . Due to such a structure, it is possible to suppress or prevent the intrusion of rains or the intrusion of dusts between the waterproof frame if and the module mounting frame  100  as well as between the module mounting frame  100  and the display module xx.  
      Here, the above-mentioned grid-like module mounting frame  100  includes a plurality of longitudinal beams  100 V the number of which corresponds to the number of the display modules xx, a plurality of lateral beams  100 H the number of which corresponds to the number of the display modules xx, and a plurality of rectangular parallelepiped spaces  100 S which are surrounded by these longitudinal beams  100 V and the lateral beams  100 H. The relationship among a length L 1 V in the up-and-down direction (vertical direction) of the display modules xx (the above-mentioned display devices xx 1 ), an inter-beam size LBV of the plurality of lateral beams  100 H, and a length LSV in the up-and-down direction (vertical direction) of the space  100 S is set as LBV&gt;L 1 V&gt;LSV over the whole width in the lateral direction as viewed from the front side of the display module XX.  
      In the same manner, the relationship among a length L 1 H (see  FIG. 7A ) in the left-and-right direction (horizontal direction) of the display modules xx (the above-mentioned display devices xx 1 ), an inter-beam size LBH (see  FIG. 6A ) of the plurality of longitudinal beams  100 V, and a length LSH (see  FIG. 6A ) in the left-and-right direction (horizontal direction) of the space  100 S is set as LBH&gt;L 1 H&gt;LSH over the whole width in the longitudinal direction as viewed from the front side of the display module XX (the above-mentioned display device xx 1 ).  
      Here, before the above-mentioned step in which the large number of display modules xx are mounted on the module mounting frame  100 , the display controller  2  is assembled to the inside of any one arbitrary space out of the above-mentioned large number of spaces  100 S.  
      By adopting the structure in which the above-mentioned relationships LBV&gt;L 1 V&gt;LSV and LBH&gt;L 1 H&gt;LSH are established, it is possible to obtain the display device  1  in which a gap between the above-mentioned display modules xx (the above-mentioned display devices xx 1 ) is small and an end portion of the above-mentioned display module xx can be firmly mounted on the module mounting frame  100 . Further, the display device mounting structure  6  receives a weight of the waterproof frame if of the display device  1  and, at the same time, the display device mounting structure  6  also receives weights of the plurality of display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn which constitute the display screen  10  and hence, a weight resistance strength of the display device  1  per se can be reduced thus realizing the reduction of weight of and the lowering of manufacturing cost of the display device  1  per se.  
      Here,  FIG. 6  and  FIG. 7  are views which illustrate only the display device  1  without illustrating the display device mounting structure  6 . As mentioned previously,  FIG. 6  is the view showing the example of the state before the display module xx is assembled in the large-sized display device, and  FIG. 7  is the view showing an example of a state in which the display module xx is assembled.  FIG. 6B  is a right side view corresponding to  FIG. 4 , wherein a predetermined number of display modules xx, xx, . . . are, in the same manner as the explanation made in conjunction with  FIG. 4 , sequentially assembled in the above-mentioned module mounting frame  100  as indicated by an arrow.  
      An example of the mounting structure (means) which mounts the display modules xx on the module mounting frame  100  is illustrated in  FIG. 8  and  FIG. 9 .  
      As shown in  FIG. 8  and  FIG. 9 , on a front-side surface of each lateral beam  100 H of the module mounting frame  100 , a tongue-like first engaging member  100 H 1  which projects horizontally and an upwardly-directed hook-like (L-shaped) second engaging member  100 H 2  are formed. The first engaging member  100 H 1  is spaced apart from the second engaging member  100 H 2  and is positioned above the second engaging member  100 H 2 .  
      As shown in  FIG. 8  and  FIG. 9 , with respect to each display module xx, on a back side of the display device xx 1  having the waterproof structure on a front side thereof, a waterproof casing which incorporates the common substrate xxb on which the drive circuit xx 2 , the image memory xx 3 , the control circuit xx 4  and the like are formed and waterproof coating xxbc such as resin molding are integrally formed with the display device xx 1 . A downwardly-directed hook-like (L-shaped) third engaging member xx 6  is mounted on an upper end portion of a back surface of the waterproof coating xxbc, while a tongue-like fourth engaging member xx 7  which projects horizontally is mounted on a lower end portion of the back surface of the waterproof coating xxbc.  
      Further, as shown in  FIG. 8  and  FIG. 9 , each lateral beam  100 H of the module mounting frame  100  has the hollow structure and the inside of each hollow lateral beam  100 H is used as a wiring route for a power source cable  100 HPC and a signal cable  100 HSC. Electric power is supplied to the power sources xx 5  of the respective display modules xx from the power source cable  100 HPC, while image control signals and image information signals are supplied to the respective display modules xx from the signal cable  100 HSC.  
      The power source cable  100 HPC is detachably connected with the power source xx 5  of each display module xx via a power source connecting line  100 PCW which passes a through hole  100 HLS formed in a lower-side surface of each lateral beam  100 H of the module mounting frame  100  using a compression bonding terminal or the like.  
      In the same manner, the signal cable  100 HSC is detachably connected with the common substrate xxb of each display module xx 5  via the signal connecting line  100 SCW which passes a through hole  100 HLS formed in the lower-side surface of each lateral beam  100 H of the module mounting frame  100  using a commercially available connector.  
      The power source xx 5  of each display module xx is arranged in the inside of the space  100 S defined in the inside of the module mounting frame  100  to which each display module xx corresponds.  
      The power source xx 5  of each display module xx in the inside of the space  100 S and the power source cable  100 HPC in the inside of the module mounting frame  100  are connected with each other by way of the above-mentioned power source connecting line  100 PCW, while the substrate xxb in the inside of each display module xx in the inside of the space  100 S and the signal cable  100 HSC in the inside of the module mounting frame  100  are connected with each other by way of the signal connecting line  100 SCW. Thereafter, a downwardly extending hook-shaped (L-shaped) third engaging member xx 6  of the display module xx is engaged with the upwardly extending hook-shaped (L-shaped) second engaging member  100 H 2  of the module mounting frame  100  thus shifting an operational state from the state shown in  FIG. 8  to the state shown in  FIG. 9 .  
      When the display module xx is assembled due to the engagement of the second engaging member  100 H 2  and the third engaging member xx 6 , as shown in  FIG. 9 , the tongue-like first engaging member  100 H 1  of the module mounting frame  100  and the tongue-like fourth engaging member xx 7  of the display module xx assume an overlapped state.  
      By fixing the first engaging member  100 H 1  and the fourth engaging member xx 7  in the overlapped state to each other using a fixing means such as screws when necessary, there is no possibility that the display module xx is inadvertently removed from the module mounting frame  100  due to wind or other factors.  
      Here, as shown in  FIG. 10 , the respective power source cables  100 HPC and the respective signal cables  100 HSC in the inside of the respective lateral beams  100 H are connected with each other in the inside of the longitudinal beams  100 V.  
      The embodiment 1 of the present invention is, as described above, directed to the assembling method of the display device  1  which constitutes the display screen  10  using a plurality of display modules xx, xx, . . . , wherein the display device is assembled by the waterproof frame mounting step which mounts the waterproof frame  1   f  on the display device mounting structure  6 , and the display screen assembling step which assembles the display screen  10  whose periphery is covered with the waterproof frame  1   f  mounted on the display device mounting structure  6  using the plurality of display modules xx, xx, . . . .  
      Further, in the embodiment 1 of the present invention, as described above, the respective display modules xx, xx, . . . are detachably mounted on the waterproof frame  1   f  by way of the module mounting frame  100 .  
      Further, the embodiment 1 of the present invention is, as described above, directed to the assembling method of the display device  1  which constitutes the display screen using the plurality of display modules xx, xx, . . . , wherein the display device  1  is assembled by the module mounting frame mounting step which mounts the module mounting frame  100  on the display device mounting structure  6 , a display module mounting step which mounts the display modules xx, xx, . . . on the module mounting frame  100 , and the display screen constituting step which constitutes the display screen  10  using the plurality of display modules xx, xx, . . . by exercising the display module mounting step plural times.  
      Further, in the embodiment 1 of the present invention, as described above, the present invention is directed to the display device which includes at least one module mounting frame  100  which is mounted on the display device mounting structure  6 , the plurality of display modules xx, xx, . . . which are detachably mounted on the module mounting frame  100  and constitute the display screen  10 , the signal cable  100 HSC which has the wiring route in the inside of the module mounting frame  100  and is detachably connected to the display modules xx, xx, . . . and supplies image signals to the display modules, and the power source cable  100 HPC which has the wiring route in the inside of the module mounting frame  100  and is detachably connected to the display modules xx, xx. . . . thus supplying electric power to the display modules xx, xx.  
      Further, in the embodiment 1 of the present invention, as mentioned previously, the module mounting frame  100  is constituted of a grid-like frame and the plurality of display modules xx, xx, . . . are detachably mounted on the beams  100 H of the module mounting frame  100 .  
     Embodiment 2  
      Hereinafter, an embodiment 2 of the present invention is explained in conjunction with  FIG. 11 .  FIG. 11  is a front view showing another example of a state before display modules are assembled to a large-sized display device. In  FIG. 11 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 10  are given same symbols. Hereinafter, points which make this embodiment 2 different from the above-mentioned embodiment 1 shown in  FIG. 1  to  FIG. 10  are mainly explained.  
       FIG. 11  is a view which corresponds to  FIG. 6A  described above, and shows particularly another example of the above-mentioned module mounting frame  100 . That is, in the above-mentioned  FIG. 6A , the example in which one grid-like module mounting frame  100  is used as the module mounting frame  100  is illustrated. In  FIG. 11 , as illustrated in the drawing, a predetermined number of ladder-like module mounting frame constitutional elements  100 VE 1 ,  100 VE 2 , . . . ,  100 VE n  which extend in the up-and-down direction (vertical direction or columnar direction) are arranged in the lateral direction (horizontal direction or row direction) to constitute a module mounting frame  100  having a predetermined area.  
      By adopting the structure which constitutes the module mounting frame  100  having the predetermined area by arranging the predetermined number of ladder-like module mounting frame constitutional elements  100 VE 1 ,  100 VE 2 , . . . ,  100 VE n  in the lateral direction (horizontal direction), particularly with respect to the large sized display device having longitudinal and lateral sizes of several meters, compared to one grid-like module mounting frame, a unit which becomes an object to be handled in the assembling operation can be miniaturized and light-weighted and hence, the unit becomes extremely light-weighted compared to the conventional self-standing display device whereby the operability and the safety of an operation to mount the module mounting frame  100  to the display device mounting structure  6  (omitted from  FIG. 11 ) are enhanced and, at the same time, a weight which is applied to mounting bolts or other mounting means for mounting the module mounting frame on the display device mounting structure  6  (omitted from  FIG. 11 ) can be decreased and the manufacturing cost can be more lowered.  
     Embodiment 3  
      Hereinafter, an embodiment 3 of the present invention is explained in conjunction with  FIG. 12 .  FIG. 12  is a front view showing another example of a state before display modules are assembled to a large-sized display device. In  FIG. 12 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 11  are given same symbols. Hereinafter, points which make this embodiment 3 different from the above-mentioned embodiments 1 and 2 shown in  FIG. 1  to  FIG. 11  are mainly explained.  
       FIG. 12  is a view which corresponds to  FIG. 6A  and  FIG. 11  described above, and shows particularly another example of the above-mentioned module mounting frame  100 . That is, in the above-mentioned  FIG. 6A , the example in which one grid-like module mounting frame  100  is used as the module mounting frame  100 . In  FIG. 12 , as illustrated in the drawing, a predetermined number of ladder-like module mounting frame constitutional elements  100 HE 1 ,  100 HE 2 , . . . ,  100 HE m  which extend in the left-and-right lateral direction (horizontal direction or row direction) is arranged in the longitudinal direction (vertical direction or columnar direction) to constitute a module mounting frame  100  having a predetermined area.  
      By adopting the structure which constitutes the module mounting frame  100  having the predetermined area by arranging the predetermined number of ladder-like module mounting frame constitutional elements  100 HE 1 ,  100 HE 2 , . . . ,  100 HE m  in the longitudinal direction (vertical direction), in the same manner as the case of the above-mentioned example shown in  FIG. 11 , particularly with respect to the large sized display device having longitudinal and lateral sizes of several meters, compared to one grid-like module mounting frame, a unit which becomes an object to be handled in the assembling operation can be miniaturized and light-weighted and hence, the unit becomes extremely light-weighted compared to the conventional self-standing display device whereby the operability and the safety of an operation to mount the module mounting frame  100  to the display device mounting structure  6  (omitted from  FIG. 12 ) are enhanced and, at the same time, a weight which is applied to mounting bolts or other mounting means for mounting the module mounting frame on the display device mounting structure  6  (omitted from  FIG. 12 ) can be decreased and the manufacturing cost can be more lowered.  
     Embodiment 4  
      Hereinafter, an embodiment 4 of the present invention is explained in conjunction with  FIG. 13 .  FIG. 13  is a front view showing another example of a state before display modules are assembled to a large-sized display device. In  FIG. 13 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 12  are given same symbols. Hereinafter, points which make this embodiment 4 different from the above-mentioned embodiments 1 to 3 shown in  FIG. 1  to  FIG. 12  are mainly explained.  
       FIG. 13  is a view which corresponds to  FIG. 6A ,  FIG. 11  and  FIG. 12  described above, and shows particularly another example of the above-mentioned module mounting frame  100 . That is, in the above-mentioned  FIG. 6A , the example in which one grid-like module mounting frame  100  is used as the module mounting frame  100  is illustrated, while in  FIG. 11  and  FIG. 12 , the example in which ladder-like module mounting frame constitutional elements  100 VE 1 ,  100 VE 2 , . . . ,  100 VE n ,  100 HE 1 ,  100 HE 2 , . . . ,  100 HE m  are used as the module mounting frame  100  is illustrated. In  FIG. 13 , as shown in the drawing, picture-frame-like module mounting frame constitutional elements  100 IE,  100 IE, . . .  100 IE are provided in a state that these module mounting frame constitutional elements  100 IE,  100 IE, . . .  100 IE individually face the above-mentioned respective display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn. That is, in this embodiment, the number of module mounting frame constitutional elements,  100 IE,  100 IE, . . .  100 IE is equal to the number of the above-mentioned respective display modules  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn.  
      In this meaner, by adopting the structure which provides the picture-frame-like module mounting frame constitutional elements,  100 IE,  100 IE, . . .  100 IE which individually face the above-mentioned respective display modules,  11 ,  12 , . . .  1   n ,  21 ,  22 , . . .  2   n , . . . m 1 , m 2 , . . . mn, it is possible to constitute the display screen  10  having an arbitrary area larger than the areas of display screens  10  in the examples shown in  FIG. 11  and  FIG. 12  which use the ladder-like module mounting frame constituting members  100 VE 1 ,  100 VE 2 , . . . ,  100 VE n ,  100 HE 1 ,  100 HE 2 , . . . ,  100 HE m . Further, this embodiment can also easily constitute the display screen  10  having an arbitrary shape.  
     Embodiment 5  
      Hereinafter, an embodiment 5 of the present invention is explained in conjunction with  FIG. 14 .  FIG. 14  is a back view showing another example of a state in which the large-sized display device is mounted on the display device mounting structure. In  FIG. 14 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 13  are given same symbols. Hereinafter, points which make this embodiment 5 different from the above-mentioned embodiments 1 to 4 shown in  FIG. 1  to  FIG. 13  are mainly explained.  
       FIG. 14  is a back view which corresponds to the above-mentioned  FIG. 3A . In the example shown in  FIG. 14 , as shown in the drawing, maintenance doors  13  are mounted on a back surface side of the display device  1 , wherein the inside of the display device  1  is exposed from the back side by opening the maintenance doors  13  and hence, the maintenance such as the inspection of the inside of the display device  1  can be properly conducted without removing the above-mentioned display modules on the front side (omitted from  FIG. 14 ).  
     Embodiment 6  
      Hereinafter, an embodiment 6 of the present invention is explained in conjunction with  FIG. 15 .  FIG. 15  is a front view showing still another example of a state in which the large-sized display device is mounted on the display device mounting structure. In  FIG. 15 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 14  are given same symbols. Hereinafter, points which make this embodiment 6 different from the above-mentioned embodiments 1 to 5 shown in  FIG. 1  to  FIG. 14  are mainly explained.  
       FIG. 15  is a front view which corresponds to the above-mentioned  FIG. 3A . In the example shown in  FIG. 15 , as shown in the drawing, the display device  1  having the structure in which one end in the lateral direction of the display device  1  as viewed from a front side is supported on a leg portion  61  is illustrated. As described above, since the display device  1  per se can have the light-weighted constitution, the display device  1  can be mounted in such a design. Further, as shown in the drawing, by incorporating the above-mentioned display controller  2  (see  FIG. 1 ) in the inside of the leg portion  61 , the display device  1  can be made further light-weighted.  
     Embodiment 7  
      Hereinafter, an embodiment 7 of the present invention is explained in conjunction with  FIG. 16 .  FIG. 16  is a longitudinal cross-sectional right side view with a part in cross-section which shows still another example of a state in which the large-sized display device is mounted on the display device mounting structure with a part in cross-section. In  FIG. 16 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 15  are given same symbols. Hereinafter, points which make this embodiment 7 different from the above-mentioned embodiments 1 to 6 shown in  FIG. 1  to  FIG. 15  are mainly explained.  
       FIG. 16  is a partially longitudinal cross-sectional right side view with a part in cross-section which corresponds to the above-mentioned  FIG. 4 . In the example shown in  FIG. 16 , the display device mounting structure  6  is constituted of a wall of a building, wherein the module mounting frame  100  is mounted on a wall surface  64  of the wall, and the display modules xx, xx, . . . xx are mounted on a front side of the module mounting frame  100  which is mounted on the wall surface  64 .  
      The building has a relatively sufficient strength with respect to the display device and the display modules xx, xx, . . . xx are assembled to the wall surface  64  as tiles and hence, it is possible to realize a wall surface display device having the stable structure. Further, it is possible to provide unique applications by changing the color of the wall or by displaying information on the wall.  
      There may be a case that the large-sized display device is, as illustrated and described in conjunction with  FIG. 1 , required to possess the display controller  2  and the plurality of control boards which control specified display module groups as the buffer memories  31 ,  32 , . . . ,  3   n  between the display modules. Further, there may be a case that it is necessary to provide the power sources xx 5  for the plurality of respective display modules. These boards and power sources can be arranged in the inside of the space  100 S in the inside of the module mounting frame  100  as described above. Although the display controller  2  and the power sources which control the whole display device  1  maybe embedded in the wall surface  64 , the display controller  2  and the power sources may be arranged in the inside of the building, while the power source cables and simple-interface signal cables may be supplied to the display device  1  on the wall surface  64  from the inside of the building.  
     Embodiment 8  
      Hereinafter, an embodiment 8 of the present invention is explained in conjunction with  FIG. 17 .  FIG. 17  is a right side view which shows another example of the display module which is the constitutional element constituting the display screen. In  FIG. 17 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 16  are given same symbols. Hereinafter, points which make this embodiment 8 different from the above-mentioned embodiments 1 to 7 shown in  FIG. 1  to  FIG. 16  are mainly explained.  
      In the above-mentioned embodiment 7, the present invention is applied to various kinds of planar display device xx 1  (see  FIG. 2 ). When the self-luminous display device is used outside in general, however, to obtain the practically available image under sunbeams, the high brightness becomes necessary. Particularly, when the brightness of the display device xx 1  is high, a heat value is increased and hence, in the display device having the structure in which the display module xx is embedded in the wall surface  64  of the building, means which suppresses the temperature elevation or a cooling means becomes important. In case of the self-luminous display device xx 1  which generates heat, when the cooling means is provided to the inside of the display device xx 1 , particularly when the cooling means cools the display device using air, it is necessary to ensure a flow passage for cooling air and hence, a thickness of a display part is increased.  
      Here, in the embodiment 8 of the present invention, a reflective display device is used as the display device xx 1 . The reflective display device xx 1 , as indicated by an arrow L in  FIG. 6 , performs a display by reflecting an external light (sunbeams at day time and illumination light or the like at night) and hence, the generation of heat is hardly recognized whereby it is possible to realize a thin display device with low power consumption which requires no cooling means. Particularly, when the reflective display device uses cholesteric liquid crystal, the reflective type display device exhibits an excellent advantage that the display can be maintained even when the power source is cut and hence, a wall surface which functions as the display device of low power consumption can be realized. Although the wall surface of the building is exposed to the sunbeams, the display device can obtain the sufficient luminance and hence, the reflective display device can also obtain the high image quality.  
     Embodiment 9  
      Hereinafter, an embodiment 9 of the present invention is explained in conjunction with  FIG. 18 .  FIG. 18  is a block diagram showing another example of the system constitution of the display system which allows the large-sized display device to perform a display. In  FIG. 18 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 17  are given same symbols. Hereinafter, points which make this embodiment 9 different from the above-mentioned embodiments 1 to 8 shown in  FIG. 1  to  FIG. 17  are mainly explained.  
      In the above-mentioned respective embodiments, the present invention is also applicable to the display of images having large information quantity such as television signals. Accordingly, the signal lines which pass through the beams  100 H,  100 H, . . .  100 V,  100 V, . . . of the above-mentioned module mounting frame  100  are used for the parallel transmission using flat cables or the serial transmission of large capacity such as optical cables. On the other hand, there may be a case that the wall-surface information display device may perform a display of small information quantity such as the application in which the information display device is exclusively used for still images. An example which is applicable to such a case is illustrated in  FIG. 18 .  FIG. 18  shows the case in which the respective display modules are connected with each other using a LAN cable LANC. By providing an interface  1 IF of LAN to each display module, it is possible to transfer the image data using the LAN cable LANC and hence, the wiring and the system constitution can be simplified. Further, compared to the general wiring such as flat cables, this embodiment can also simplify the structure and hence, this embodiment is advantageous in the wiring in a narrow space.  
     Embodiment 10  
      Hereinafter, an embodiment 10 of the present invention is explained in conjunction with  FIG. 19 .  FIG. 19  is a longitudinal cross-sectional right side view with a part in cross section showing a part in cross section by enlarging an example of a display module fixing means particularly in a state before the display modules are assembled in the large-sized display device. In  FIG. 19 , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 18  are given same symbols. Hereinafter, points which make this embodiment 10 different from the above-mentioned embodiments 1 to 9 shown in  FIG. 1  to  FIG. 18  are mainly explained.  
       FIG. 19  is the partially longitudinal cross-sectional right side view with a part in cross section which corresponds to the above-mentioned  FIG. 8  and  FIG. 9 .  FIG. 19  illustrates the structure in which, with respect to the display modules xx which are arranged close to each other, a screwing part xx 8  of one display module xx and a screwing part xx 9  of another display module xx are screwed.  
       FIG. 19  illustrates an example of the duplicate mounting structure which uses the mounting based on the engagement between the engaging member xx 6  and the engaging member  100 H 2  described previously in conjunction with  FIG. 8  and  FIG. 9  and the mounting based on screwing of the screw parts xx 8 , xx 9  in combination.  
      With respect to the display device which is formed on the wall surface of the building, when the display module is troubled, it is necessary to perform the maintenance which exchanges and repairs the display module from a front surface side. Here, by providing mechanical parts which are necessary for the detachment of the display module which is accessible from the front surface side of the display device to a joint portion between the modules, it is possible to realize the easy replacement operation. In the large-sized display device, in general, the joint between the display modules is designed to have a minimum width to make the joint inconspicuous. For example, in JP-A-2004-341468, an example in which display devices are arranged in an overlapped manner so as to make lead portions of electrodes inconspicuous is disclosed. However, this example has a drawback with respect to a fixing method of panels. That is, it is necessity to mount connecting pins on the panels. As in the case of the application described in this embodiment where the display device is used in a state that the display device is mounted on the wall of the building or the like, it is possible to ensure a sufficient viewing distance and hence, the influence of joints to image quality is small. Accordingly, by making use of the joint portion, it is possible to firmly fix the display module xx to the module mounting frame  100  from the front surface side and, at the same time, it is possible to easily and detachably mount the display module xx on the module mounting frame  100 .  
      In  FIG. 19 , first of all, the display module xx is easily and detachably mounted on the module mounting frame  100  which is mounted on the wall surface due to the engagement of the engaging member xx 6  and the engaging member  100 H 2 . Further, to ensure the sufficient strength against strong wind, the display module xx is firmly fixed to the module mounting frame  100  by the mutual screwing of display modules xx using the screw parts xx 8 , xx 9 .  
     Embodiment 11  
      Hereinafter, an embodiment 11 of the present invention is explained in conjunction with  FIG. 20A  and  FIG. 20B . FIG.  20 A and  FIG. 20B  are longitudinal cross-sectional right side views with a part in cross section showing a part in cross section by enlarging another example of a display module fixing means particularly in a state before the display modules are assembled in the large-sized display device. In  FIG. 20A  and  FIG. 20B , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 19  are given same symbols. Hereinafter, points which make this embodiment 11 different from the above-mentioned embodiments 1 to 10 shown in  FIG. 1  to  FIG. 19  are mainly explained.  
       FIG. 20A  and  FIG. 20B  show an example in which, as described in the above-mentioned JP-A-2004-341468, the respective display modules xx are inclined and portions of panel-like display devices xx 1 , xx 1  which are arranged close to each other are arranged in a partially overlapped manner, and a module detachable mechanism which is manipulable from a gap between overlapped portions of both panel-like display devices xx 1 , xx 1  is provided. This embodiment includes a detaching part (mounting means) xx 10  provided with an interlocking mechanism illustrated in  FIG. 20A  and a fastening part (mounting means) xx 11  using a screw which is arranged close to the detachable part and is illustrated in  FIG. 20B . Due to the provision of such duplicate detaching mechanisms, even in the structure where the panels are arranged to be overlapped to each other, it is possible to realize the easy maintenance and the high reliability. Here, the detaching parts xx 10  and the fastening part xx 11  may be equal to corresponding parts described in the above-mentioned JP-A-2004-341468 and hence, the explanation of the specific structure and the manner of operation of these parts is omitted.  
     Embodiment 12  
      Hereinafter, an embodiment 12 of the present invention is explained in conjunction with  FIG. 21A  to  FIG. 21C .  FIG. 21A  to  FIG. 21C  are exploded views of an example of another large-sized display device, wherein  FIG. 21A  is a front view showing a state in which a waterproof frame is disassembled,  FIG. 21B  is a front view of a display screen part, and  FIG. 21C  is a front view showing a state in which the waterproof frame is mounted on an outer periphery of the display screen part. In  FIG. 21A  to  FIG. 21C , parts which are identical with or correspond to the above-mentioned parts shown in  FIG. 1  to  FIG. 20B  are given same symbols. Hereinafter, points which make this embodiment 12 different from the above-mentioned embodiments 1 to 11 shown in  FIG. 1  to  FIG. 20B  are mainly explained.  
      The above-mentioned display device  1  in the embodiment 1 of the present invention is constituted by assembling the display modules xx in the frame  1   f  which is preliminarily fixed to the display device mounting structure  6  having the sufficient strength. In the same manner as the assembling of such display modules, it is possible to mount a collapsible frame body  10   f  on a periphery at the time of assembling the display screen  10 . While the conventional frame determines a design of the display device as shown in  FIG. 22 , this embodiment 12 shows an example in which the collapsible frame body  10   f  which is constituted of a plurality of frame body constituting members  10   fe  is mounted on the periphery of the display screen  10 . The collapsible frame body  10   f  can form the light-weighted and arbitrary design. Particularly, it is possible to change only the frame body  10   f  after installing the display device. Accordingly, it is possible to arbitrarily change the design of the display device  1 .  
      While the presently preferred embodiments of the present invention have been shown and described, it is to be understood that these disclosures are for the purpose of illustration and that various changes and modifications may be made without departing from the scope of the invention as set forth in the appended claims.