Abstract:
A display system comprising: a display apparatus; a frame; an engaging component ( 81 ) arranged on the display; an engaged component ( 82 ) engages to the engaging component ( 81 ) and connected to the frame via an elastic component ( 84 ); a preventing component ( 85 ) fixed to the engaged component ( 82 ), wherein the prevention component ( 85 ) prevents the display apparatus from falling ahead.

Description:
[0001]    This application claims priority under 35 U.S.C. §119 from Japanese patent application numbers 2009-020349, 2009-020350, 2009-020351, 2009-020352, and 2009-020353, all of which are hereby incorporated by reference herein. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a display system, especially, a display system for installation outdoors. 
         [0004]    2. Description of Related Art 
         [0005]    Conventionally, plane surface type displays, such as liquid crystal displays (LCDs), are widely used. 
         [0006]    Recently, it has been desired to place liquid crystal displays permanently outdoors, because the thickness of the displays are small and can display high resolution pictures. Since the thickness of the LCD display is small, it can be installed on an outer wall of a building, or in narrow places such as bus stop shelters, etc. Moreover, because the resolution of a LCD display is high, it can display a clear picture even if the screen size is small. 
         [0007]    Therefore, in order to install a liquid crystal display outdoors, a display unit arranging a liquid crystal display panel inside the accommodation part having a sealed structure is considered. However, in the outdoors, vibrations caused by vehicles passing near the display unit may damage the display unit. 
       SUMMARY OF THE INVENTION 
       [0008]    A display system of the present invention comprises: a display apparatus; a frame; an engaging component ( 81 ) arranged on the display; an engaged component ( 82 ) engages to the engaging component ( 81 ) and connected to the frame via an elastic component ( 84 ); a preventing component ( 85 ) fixed to the engaged component ( 82 ), wherein the prevention component ( 85 ) prevents the display apparatus from falling over. 
         [0009]    A first display apparatus of the present invention comprises: a display part; a light transmitting part arranged at the front side of the display part, wherein the light transmitting part comprises: a pair of light transmitting boards, and a light absorbing film inserted between the boards absorbing infrared radiation. 
         [0010]    A second display apparatus of the present invention comprises: a display part; a cooling device cooling the display part; a light detector detecting an amount of light entering the display part, and a control part which operates the cooling device when the light detected by the light detector is larger than a predetermined value, and stops the cooling device when the amount of light detected by the light detector is smaller than the predetermined value. 
         [0011]    A third display apparatus of the present invention comprises: a display part; an electric circuit controlling the display part; an accommodation part arranged at the back side of the display part and accommodates the electric circuit; an upper part cover component constituting the back wall of the accommodation part; a lower part cover component constituting the back wall of an accommodation part. The upper part cover component comprises: a first penetration hole made to pass the leg of a screw but not the head of the screw, and a second penetration hole connected with the first penetration hole and passes both the leg and head of the screw. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1  is a perspective diagram showing the display system having a display apparatus. 
           [0013]      FIG. 2  is an exploded perspective view of a display system. 
           [0014]      FIG. 3  is a sectional view along the IV-IV line shown in  FIG. 2 . 
           [0015]      FIG. 4  is a sectional view along the V-V line shown in  FIG. 3 . 
           [0016]      FIG. 5  is a sectional view along the VI-VI line shown in  FIG. 3 . 
           [0017]      FIG. 6  is a sectional view along the VII-VII line shown in  FIG. 3 . 
           [0018]      FIG. 7  is a two-dimensional diagram of this display system. 
           [0019]      FIG. 8  is an enlarged view of IX area shown in  FIG. 4 . 
           [0020]      FIG. 9  is the perspective diagram when fractured along X-X-rays shown in  FIG. 3 . 
           [0021]      FIG. 10  is the perspective diagram when fractured along XI-XI line shown in  FIG. 3 . 
           [0022]      FIG. 11  is a sectional view along the XI-XI line shown in  FIG. 3 . 
           [0023]      FIG. 12  is an enlarged view of the XIII area shown in  FIG. 11 . 
           [0024]      FIG. 13  is an enlarged view of the XIV area shown in  FIG. 11 . 
           [0025]      FIG. 14  is a perspective diagram of the back side of the display apparatus when a cover component is attached. 
           [0026]      FIG. 15  is a perspective diagram of the back side of the display apparatus when a cover component is detached. 
           [0027]      FIG. 16  is a perspective diagram of the back wall of the first accommodation part when a cover component is attached, viewed from the back lower side. 
           [0028]      FIG. 17  is a perspective diagram of the back wall of the first accommodation part when a cover component is detached, viewed from the back lower side. 
           [0029]      FIG. 18  is a perspective diagram showing the state before attaching the display apparatus to a support stand. 
           [0030]      FIG. 19  is a two-dimensional diagram showing the frame part of a support stand. 
           [0031]      FIG. 20  is a perspective diagram showing a first state of the engaging component and the engaged component, when attaching a display apparatus to a support stand. 
           [0032]      FIG. 21  is a perspective diagram showing a second state of the engaging component and the engaged component, when attaching a display apparatus to a support stand. 
           [0033]      FIG. 22  is a perspective diagram showing a third state of the engaging component and the engaged component, when attaching a display apparatus to a support stand. 
           [0034]      FIG. 23  is a two-dimensional diagram showing the lower part cover part of the cover component. 
           [0035]      FIG. 24  is an enlargement of an area A shown in  FIG. 23 . 
           [0036]      FIG. 25  ( a ) is two-dimensional diagram and (b) is perspective diagram showing a state where a lower cover part is arranged in the first position. 
           [0037]      FIG. 26  ( a ) is two-dimensional diagram and (b) is perspective diagram showing a state where a lower cover part is arranged in the second position. 
           [0038]      FIG. 27  is a perspective diagram showing a prevention component fixed to the engaging component. 
           [0039]      FIG. 28  is a perspective diagram showing a prevention component fixed to the engaging component, when viewed from a different direction from  FIG. 27 . 
           [0040]      FIG. 29  is a perspective diagram showing a display fixed to the frame part of a support stand. 
           [0041]      FIG. 30  is a perspective diagram showing a back wall of the first accommodation part viewed from its back side when plurality of cables are pulled out. 
           [0042]      FIG. 31  is a perspective diagram showing a hack wall of the first accommodation part viewed from its back side when plurality of cables are removed. 
           [0043]      FIG. 32  is a sectional view showing a light transmitting part formed in the front wall. 
           [0044]      FIG. 33  is a block diagram showing an air conditioner, a control means, and a light detector equipped in a display apparatus. 
           [0045]      FIG. 34  is a front view of a display system. 
           [0046]      FIG. 35  is a sectional view along the B-B line shown in  FIG. 34 . 
           [0047]      FIG. 36  is a sectional view along the C-C line shown in  FIG. 34 . 
           [0048]      FIG. 37  is a sectional view along the E-E line shown in  FIG. 34 . 
           [0049]      FIG. 38  is a figure showing the relation between the light detected by a light detector, and the temperature of the display panel. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0050]    The present invention embodied in a display apparatus or display system will be specifically described below with the reference to the drawings. 
         [0051]    1. Overview of the Display System 
         [0052]    As shown in  FIG. 1  the display system has a flat rectangular appearance, and as shown in  FIG. 2 , it includes a display apparatus  1 , support stand  2 , backboard  3 , cover  4 , fluorescent light fittings  5 , and pair of aeration plates  6 ,  6 . The display apparatus  1  displays an image on the surface  101  of the display system, and has a liquid crystal display  10  as shown in  FIG. 5 . The detail of the display apparatus  1  is explained below in section  2  entitled “A display apparatus”. 
         [0053]    The support stand  2  supports the display apparatus  1  and the backboard  3 , and a frame part  21  for attaching the display apparatus  1  and the backboard  3  is formed. The frame part  21  has a structure that can contain the display apparatus  1  and the backboard  3 . The structure for attaching the display apparatus  1  to the support stand  2  is explained below in section  3  entitled “Composition for attaching a display apparatus to a support stand”. 
         [0054]    The backboard  3  is an installation stand for attaching an advertisement, and is installed in the frame part  21  at the back side of the display apparatus  1 . The advertisement is attached on the surface  31  of the backboard  3 , which is a back surface  102  of a display system. Here, the backboard  3  is formed from a material having an optical transparency in order to transmit a light emitted from the fluorescent light fittings  5 . The advertisement attached to the backboard  3  is also formed from a material having an optical transparency as well. Hereafter, such advertisement is called “advertising film”. 
         [0055]    The cover  4  is removably attached to the support stand  2 , and it covers the surface  31  of backboard  3  when it is closed. Thereby, the advertisements can be protected by the cover  4 . The portion which faces the surface  31  among the covers  4  is formed with a material having an optical transparency. Thereby, the advertisement can be seen from the back side  102  of the display system. 
         [0056]    The fluorescent light fitting  5  is an instrument which illuminates the advertising film attached on the surface  31 , and is constituted by a plurality of fluorescent lights extending in the perpendicular direction. The fluorescent light fitting  5  is attached to the frame part  21  between the display apparatus  1  and the backboard  3 . By illuminating an advertising film with the fluorescent light fittings  5 , characters printed on the advertising film can be seen even at nighttime. 
         [0057]    A pair of aeration plates  6 ,  6  are arranged at the front  101  and the back  102  of the display system respectively, at the bottom part of the display apparatus  1 . A plurality of vents  61 , which aerate the inside and the outside of the display system are formed in the aeration plates  6 . 
         [0058]    The display system mentioned above can be installed in a bus stop or similar waiting area of public transportation systems, as shown in  FIG. 3 . According to this system, it can offer many kinds of information to the people waiting at the stop using still pictures or moving animations. 
         [0059]    By operating a display system by remote control using a cable or a wireless communication system, information displayed on the screen  112   a  can be updated remotely. Furthermore, when display systems are installed in each of multiple bus stops of a transportation system, those display systems can be managed collectively. 
         [0060]    2. Display Apparatus 
         [0061]    As shown in  FIG. 3  and  FIG. 4 , the display apparatus  1  has a liquid crystal display  10 , a housing  12 , a plurality of heat pipes  13 , a circulation fan  18 , a radiating fin  14 , aeration fans  15  and  16 , and a heat collecting fin  17 . Furthermore, as shown in  FIG. 11 , the display apparatus  1  also has an air conditioner  19 , a circulation fan  181 , a heat insulating component  7 , and heat collecting fin  71 , first blowing fan  72 , and second blowing fan  73 . 
         [0062]    Liquid Crystal Display  10   
         [0063]    The liquid crystal display  10  is a plane surface type display, and as shown in  FIG. 5 , it has a display panel  11 , and a circuit board  11   e  for controlling the display panel  11 . 
         [0064]    Depending upon its usage, various forms of display panel  11  can be used. In this embodiment, the display panel  11  has a rectangular shape extending in the vertical direction so that it can be installed in narrow places such as bus stops. Further, the display panel  11  tends have a high temperature, because it tends to generate heat especially on the surface  112  where the display screen  112   a  is formed. 
         [0065]    Housing  12   
         [0066]    Accommodation Part 
         [0067]    As shown in  FIG. 11 , inside the housing  12 , a first accommodation part  121  maintained sealed or substantially sealed, and the second accommodation part  22 , located in the back side of the back wall  125  of the first accommodation part  121 , are formed. While the display panel  11  is arranged inside the first accommodation part  121  so that the display screen  112   a  turns to the front side  101  of the display apparatus, the circuit board  11   e  is arranged inside the second accommodation part  22 , in the back side of the back wall  125 . 
         [0068]    As shown in  FIG. 3  and  FIG. 11 , the housing  12  has a front wall  124  on the surface  112  side of the display panel  11 , a back wall  125  on the back side  111  of the panel  11 , side walls  121   a  and  121   b  on the both sides of the panel  11 , an upper surface wall  127  on the upper end side  113  of the panel  11  (see  FIG. 12  as well), and an undersurface wall  128  on the bottom side  114  of the panel  11  (see  FIG. 13  as well). 
         [0069]    A front wall  124  has a light transmitting part, in a location where it faces the display screen  112   a . As shown in  FIG. 32 , the light transmitting part has a first light transmitting board  124   a  countering the front side of the display screen  112   a , a second light transmitting board  124   b  overlapping the front side of the board  124   a , and the light absorbing film  124   c  sandwiched by the boards  124   a  and  124   b.    
         [0070]    The light transmitting boards  124   a  and  124   b  are formed by a material having a light transmittance such as a glass material. For example, glass material having 4 mm and 6 mm thick are used for light transmitting boards  124   a  and  124   b  respectively. Thereby, the strength of the light transmitting part is raised. Moreover, film which absorbs far-infrared rays is used for the light absorbing film  124   c.    
         [0071]    By forming a light transmitting part in the front wall  124 , the display screen  112   a  is viewable from the front side of the housing  12 . 
         [0072]    According to the above-mentioned light transmitting part, it can reduce sunlight from reaching the display screen  112   a , since the light absorbing film  124   c  absorbs far-infrared radiation. Therefore, the temperature rise in the display screen  112   a  is suppressed. Moreover, the visibility of the display screen  112   a  improves when a direct sunlight is incident. 
         [0073]    Further, since the light absorbing film  124   c  is sandwiched by two light transmitting boards  124   a  and  124   b , degradation of the film  124   c  is prevented. 
         [0074]    Instead of sandwiching the light absorbing film  124   c  by light transmitting boards  124   a  and  124   b , the film  124   c  may be simply attached to a front side or back side of the first light transmitting board  124   a . Even in this case, it can prevent sunlight from reaching the display screen  112   a , since the sunlight entering the front wall  124  is absorbed by the film  124   c.    
         [0075]    As shown in  FIG. 3  and  FIG. 11 , the first accommodation part  121  maintained in a sealed or substantially sealed state, is formed by the front wall  124 , the back wall  125 , the side walls  121   a  and  121   b , the upper surface wall  127 , and undersurface wall  128 . 
         [0076]    By maintaining the first accommodation part  121  in a sealed state, and by accommodating the display panel  11  inside the first accommodation part  121 , the display panel  11  can be protected from rain, dust, debris, snow, etc. even when the display apparatus  1  is installed outdoors. 
         [0077]    As shown in  FIG. 11 , a concave portion  125   a  is formed in the back of the back wall  125 , and the cover component  23  covering the concave portion  125   a  is attached removably in front of the fluorescent light fittings  5  and the backboard  3 . In the cover component  23 , a pair of ventilation openings  26  and  27  is formed as shown in  FIG. 11  and  FIG. 14 . The opening  26  is arranged in the lower part, and the opening  27  is arranged in the upper part. 
         [0078]    As shown in  FIG. 15 , the cover component  23  is constituted by a lower cover  231  covering the lower part space of the concave portion  125   a , the upper cover  232  covering the upper part space of the concave portion  125   a , and the middle cover  233  covering the space between the upper and lower part space. In the lower cover  231 , a ventilation opening  26  is formed, and in the upper cover, the other ventilation opening  27  is formed. 
         [0079]    Each of the cover parts  231 ,  232 ,  233  is removably screwed on the back of the back wall  125 .  FIG. 23  is a two-dimensional diagram showing the lower cover  231 . In the cover  231 , a plurality of screw penetration holes  230  for passing a screw when screwing the cover  231  to the back wall  125  are formed. As shown in  FIG. 24 , each of the holes  230  is constituted by a first penetration hole  23   a  and second penetration hole  23   b  communicating each other. As shown in  FIG. 25  ( a ) and  FIG. 25  ( b ), the first penetration hole  23   a  penetrates the leg  431  of screw  43 , while it does not penetrate a head  432  of the screw  43  (since the leg  431  is hidden by the lower cover  231  in  FIG. 25 , see  FIG. 26(   b ) also). The second penetration hole  23   b  passes both leg  431  and head  432  of the screw  43 , as shown in  FIG. 26  ( a ) and  FIG. 26  ( b ). 
         [0080]    Since the first penetration hole  23   a  and the second penetration hole  23   b  are communicated, the lower cover  231  can slide between a first position where the leg  431  of the screw  43  penetrates the hole  23   a  (see  FIG. 25  ( a )), and a second position where the leg  431  penetrates the hole  23   b  (see  FIG. 26  ( a )). 
         [0081]    When the lower cover  231  is attached to the back wall  125 , the cover  231  is screwed in a state where the leg  431  of the screw  43  is penetrating the first penetration hole  23   a  as shown in  FIG. 25  ( a ). When removing the cover  231  from this state, the screw  43  is loosened first and then the cover  231  is slide from the first position to the second position. By moving the cover  231  backward in the second position, the head  432  of the screw  43  passes the second penetration hole  23   b , and thus the cover  231  can be seceded from the back wall  125 . 
         [0082]    Therefore, by simply loosening the screw  43  without detaching the screw  43  from the back wall  125 , the lower cover  231  can be removed from the back wall  125 . Further, during the attaching and detaching process as mentioned above, since the screw  43  remains attached to the back wall  125 , the cover  231  can be hooked to the screw  43 , and thus it can prevent the cover  231  from falling down. 
         [0083]    On the other hand, in order to attach the lower cover  231  to the back wall  125 , it can be done inversely from the detaching process as described above. Therefore, the lower cover  231  can be attached to the back wall  125  while the screw  43  remained attached to the back wall  125 . 
         [0084]    The same applies to the attaching and detaching of the upper cover  232  and the central cover  233 , since they have a plurality of screw penetration holes  230  consisted by the penetration holes  23   a  and  23   b  as well as the lower cover  231 . 
         [0085]    Thus, the attaching and detaching of the cover component  23  (i.e. covers  231 ,  232 , and  233 ) is eased. 
         [0086]    By attaching the cover component  23  to the back wall  125 , the concave portion  125   a  of the back wall  125  is closed by the cover component  23 , and thus the second accommodation part  22  surrounded by the inner wall and the cover component  23  of the concave portion  125   a  is formed. In other words the front and the side wall of the second accommodation part  22  is constituted by the inner wall of the portion  125   a , and the back wall of the accommodation part  22  is constituted by the cover component. 
         [0087]    Thus, the circuit board  11   e , which is arranged at an inner space of the concave portion  125   a , is accommodated inside the second accommodation part  22 . Thereby, the circuit board  11   e  arranged inside the accommodation part  22  will not be exposed to rainstorms or outside air when the display apparatus  1  is installed outdoors. Moreover, by arranging the circuit board  11   e  inside the second accommodation part  22 , separately from the first accommodation part  121  for the display panel  11 , the circuit board  11   e  will not be affected by a heat from the display panel  11 . Accordingly, the circuit board  11   e  is less likely to be damaged. 
         [0088]    By detaching the cover component  23 , the back wall of the second accommodation room  22  is removed, and thereby the repairing or adjustment of the circuit board  11   e  can be done easily from back side of the case. Further, since attaching and detaching of the cover component  23  can be easily performed, the repairing or adjustment can be performed easily. 
         [0089]    Instead of forming the screw penetration hole  230  consisted by the first and the second penetration holes  23   a  and  23   b  in all Of the cover parts  231 ,  232 ,  233 , the screw penetration hole  230  may be formed only in the upper cover  231 . Since the upper part cover component  231  is arranged in a higher position, a difficulty may follow when removing it, but by the penetration hole  230 , it can prevent the upper cover  232  from falling off when attaching or removing. 
         [0090]    Further, when the concave portion  125   a  is covered by the cover component  23 , the portion  125   b  (which is also a portion of the back wall  125 ) formed under the concave portion  125   a , and the cover component  23  are aligned in the perpendicular direction, as shown in  FIG. 11  and  FIG. 13 . 
       Second Concave Portion 
       [0091]    As shown in  FIG. 31 , at the back of the back wall  125 , a second concave portion  125   c , which is different from the concave portion  125   a , is further formed, and inner space of portions  125   a  and  125   c  are in communication with each other. 
         [0092]    To the circuit board  11   e  accommodated in the inner space of the concave portion  125   a , a plurality of cables  11   f  are connected. These cables  11   f  run through the inner space of the concave portion  125   c  as shown in  FIG. 30 . Accordingly, the cables  11   f  are pulled out of the housing  12 . The cables  11   f  are for example, cables for power supplies of the display panel  11 , air conditioner  19  or fans, or a cable for communications. 
         [0093]    When pulling the cables  11   f  outside the housing  12 , it is desirable to bundle these cables  11   f  into one inside the housing  12  so that the connection with an external power supply or other apparatus can be made easily. Even if these cables are bundled inside the housing  12  to make a thick bundle, since the bundle can be accommodated in the space inside the second concave portion  125   c , the extra space is not needed, and thus it can prevent the display apparatus  1  from growing in size. 
         [0094]    Further, since the cover component  23  is removable from the back of the back wall  125 , the cables  11   f  can be accommodated in a space inside the portion  125   c  in a state where the cover  23  is detached. Therefore, it can simplify the operation for passing the cables  11   f  inside the portion  125   c.    
         [0095]    Back Cover  4   
         [0096]    As shown in  FIG. 9  and  FIG. 11 , an opening  129 , which can be opened and closed by the back cover  4 , is formed in the back side of the housing  12 . Thereby, the advertisements installed in the backboard  3  can be easily replaced. 
         [0097]    Although the outdoor air might intrude inside the housing  12  when the back cover  4  is opened for replacing the advertisement, display panel  11  and the circuit board  11   e  are less likely to be exposed to the outdoor air because they are arranged inside the accommodation parts  121  and  22 . Thus, the damaging of the panel  11  and the circuit board  11   e  are prevented. 
       Circulation Path 
       [0098]    As shown in  FIG. 10  and  FIG. 11 , the circulation path  92  surrounding the display panel  11  is formed inside the accommodation part  121 . In  FIG. 10  and  FIG. 11 , in order to clearly show the circulation path  92 , an illustration of the heat pipes  13  and the heat collecting fins  17  is omitted (as in  FIG. 12  and  FIG. 13  as well, mentioned afterwards). 
         [0099]    In this embodiment, a circulation path  92  is constituted by four path parts  11   a  to  11   d . The path part  11   a  is formed between the surface wall  124  of the accommodation part  121 , and the surface  112  of the display panel  11 , and is extended along the surface  112  in a perpendicular direction. In detail, a pair of path formation components  921 ,  921  for forming the path part  11   a  is arranged on the surface  112  as shown in  FIG. 4 . The pair of path formation components  921 ,  921  is extended along the surface  112  in a perpendicular direction and is intervened by the surface wall  124  and the surface  112  on both sides of the display screen  112   a  (see  FIG. 8 ). Thus, the path part  11   a  is formed, surrounded by the components  921 , 921 , the surface wall  124 , and the surface  112 . 
         [0100]    Additionally, as shown in  FIG. 12 , a path part  11   b  is formed between the upper surface wall  127  of the accommodation part  121 , and the upper end side  113  of the display panel  11 . The path part  11   c  is formed between the back wall  125  and the back  111 , and is extended along the back  111  in the perpendicular direction. The path part  11   d  is formed between the undersurface wall  128  and the lower end side as shown in  FIG. 13 . 
         [0101]    In this embodiment, the width W of the path part  11   a  (in the direction perpendicular to the outer surface of the display panel  11 , see  FIG. 11 ) is smaller than that of the path part  11   c . For example, the width W of the path part  11   a  is about 10 mm. Similarly, width W of the path parts  11   b  and  11   d  are about 10 mm. 
         [0102]    The path parts  11   a ,  11   b ,  11   c ,  11   d  are annularly connected in order around the display panel  11 , and surround the display panel  11 . In other words, the path part  11   a  and the path part  11   c  are connected via path part  11   b  or path part  11   d  in the upper part or lower part respectively. The air in the circulation path  92  circulates through the surroundings of the display panel  11  by circulation fans  18  and  181  mentioned later. Therefore, the heat generated in the display screen  112   a  moves to the back  111  side. 
         [0103]    Aeration Way 
         [0104]    Inside the housing  12 , the aeration ways  122  and  123  leading to the outside of the housing  12  is formed outside of the accommodation part  121 . As shown in  FIG. 3 , the aeration way  122  stretches along the side wall  121   a , which is one side wall of the accommodation part  121  in the perpendicular direction, and the aeration way  123  stretches along the side wall  121   b , a side wall of the another side. Hence, by forming the aeration ways  122  and  123  in both sides of the accommodation part  121 , it can prevent the thickness of a display apparatus  1  being large. 
         [0105]    The upper end  122   a  of the aeration way  122  is bent in a cranked shape as shown in  FIG. 5 , and it leads to the outside of the housing  12  through the vent  62  (see  FIG. 7 ) provided in the upper surface  21   a  of the frame part  21  of the support stand  2 . It is as well for the upper end  123   a  of the aeration way  123 . As shown in  FIG. 6 , the lower end part  122   b  of the aeration way  122  leads to the outside of the housing  12  through the vent  61  of the aeration plates  6  which is installed under the display apparatus  1 . The same applies to the lower end mart  123   b  of the aeration way  123 . 
         [0106]    Heat Pipe  13   
         [0107]    A plurality of heat pipes  13  are arranged in the path part  11   c  of the circulation path  92 . As shown in  FIG. 3 , a plurality of heat pipes  13  are fixed to the back  111 , in a predetermined interval to perpendicular direction. In this embodiment, such heat pipes  13  are arranged on the both sides of the central line  111   a  of the back  111  in pairs. 
         [0108]    As shown in  FIG. 8 , a heat pipe  13  arranged at the aeration way  122  side of the central line  111   a  is extended from the back  111  of the display panel  11  to the aeration way  122 , and penetrates a side wall  121   a  of the accommodation part  121 , and is extended to the outside of the accommodation part  121 . In detail, the heat pipe  13  is extended from the inside of the accommodation part  121  to the inside of the aeration way  122 . In other words, the heat pipe  13  is arranged, protruding to the aeration way  122 . 
         [0109]    In detail, as shown in  FIG. 8 , the penetration hole  126  is formed in the side wall  121   a  of the accommodation part  121 , and the heat pipe  13  is stretched from the inside of the accommodation part  121  to the inside of the aeration way  122  via the penetration hole  126 . 
         [0110]    The heat pipe  13  arranged at the aeration way  123  side of the central line  111   a  stretches to the inside of the aeration way  123  from the inside of the accommodation part  121  (see  FIG. 4 ) via side wall  121   b  as well as a heat pipe  13  extended to the aeration way  122 . 
         [0111]    Further, as shown in  FIG. 8 , the heat pipe  13  is thermally connected to the display panel  11 , by contacting the back  111  of the panel  11 , or via a heat conduction component. A part of the heat pipe  13 , which does not contact to the panel  2 , is covered by an insulation cover  133 . 
         [0112]    Thereby, heat from the display panel  11  can be collected directly from the back  111 . Further, by covering the heat pipe  13  by the insulation cover  133 , transmission of the heat of the heat pipe  13  to the air inside the accommodation part  121  is inhibited. Accordingly, the heat collected from the back  111  is efficiently transmitted outside the first accommodation part  121 . 
         [0113]    The heat emitted into the aeration way  122  and  123  from the heat pipe  13  is diffused outside the housing  12  via aeration ways  122  and  123 . Hence, the aeration ways  122  and  123  function as heat collecting means which collect heat from the heat pipe  13 . Accordingly, the rise in the temperature of the display panel  11  is prevented and the function of the liquid crystal display  10  can be maintained in a good state. 
         [0114]    In this embodiment, since the heat pipes  13  are arranged at predetermined intervals at the back  111  of the display panel  11 , heat can be collected from the whole path part, and can be collected from the whole back  111  side of a liquid crystal display. This enables the cooling efficiency of the display apparatus  1  to be high. 
         [0115]    The temperature in the accommodation part  121  becomes higher than the temperate outside the accommodation part (i.e. aeration ways  122  and  123 ) when the display panel  11  generates heat. Additionally, coolant for heat exchange (e.g., fluid such as water) is placed inside the heat pipe  13 . Therefore, from a view of raising the heat exchange efficiency of the heat pipe  13 , it is desirable to arrange the heat pipes  13  so that they extend obliquely upward toward the aeration way  122  or  123  from inside of the accommodation part  121  as shown in  FIG. 3 . 
         [0116]    The heat pipe  13  in the outer side portion is arranged at a higher position than its inner side portion. By the heat from the display panel  11 , the coolant in the inner side heat pipe  13  evaporates, and easily rises above toward the outer side. In the outer side portion, since the heat is deprived from the coolant by an air outside the accommodation part  121 , the coolant is liquefied again and then falls back lower to inner side portion of the heat pipe  13 . Then the coolant is evaporated again. 
         [0117]    Thus, the coolant inside the heat pipe  13  circulates efficiently, and the heat exchange efficiency of the heat pipe  13  is raised. Accordingly, the heat from the panel  11  collected by the heat pipe  13  is efficiently emitted outside the first accommodation part  121 . 
         [0118]    Further, in this embodiment, since the heat pipe  13  is arranged at the back  111  of the display panel  11 , restrictions when arranging the heat pipe  13  at the surface  112  side (i.e. inside the path part  11   a ) such as reduction of the display screen  112   a , enlargement of a display apparatus  1 , etc. are prevented. Thus, the heat exchange efficiency in the heat pipe  13  is high even if the heat pipe  13  is arranged at the back  111  because the heat generated by the display screen  112   a  is led to the heat pipe  13  by the air circulating through the circulation path  92 . 
         [0119]    Further, in order to raise a heat collecting efficiency from the back side  111  of the display panel  11 , each of the heat pipes  13  is arranged along the back  111 , as shown in  FIG. 4  and  FIG. 8 . 
         [0120]    Further, in this embodiment, the heat pipes  13  are repeatedly arranged in predetermined intervals in the perpendicular direction as shown in  FIG. 3 , and are extended to the inside of the aeration way  122  or  123 , maintaining the distance with the adjacent heat pipe  13  at the predetermined interval. Therefore, the heat collected by the heat pipe  13  can be dissipated in a distributed manner inside the aeration way  122  and  123 , and as a result, the heat exchange (or heat dissipation) efficiency of the heat pipe  13  inside the aeration ways  122  and  123  can be increased. 
         [0121]    Air Conditioner  19   
         [0122]    The air conditioner  19  has an evaporator  191  and a condenser  192  as shown in  FIG. 2 ,  FIG. 9 ,  FIG. 10 , and  FIG. 11 . Moreover, the air conditioner  19  also has a compressor which is not illustrated. The compressor is arranged at side portion of the condenser  192  under the evaporator  191  for example. The evaporator  191  cools the air circulating through the circulation path  92  and returned to the air conditioner  19 . The cooled air is again sent to the circulation path  92 . The compressor compresses the coolant which flows inside the evaporator  191 . The condenser  192  cools the coolant having a high temperature and pressure compressed by the compressor, and generates a liquefied coolant. When the liquefied coolant flows through the evaporator  191 , the evaporator  191  can cool the surrounding air. 
         [0123]    As shown in  FIG. 10  and  FIG. 11 , the evaporator  191  is arranged at the back  111  side of the display panel  11  near the undersurface  114  of the display panel  11 . In other words, the evaporator  191  is arranged at the lower end part of the path part  11   c , in detail a front surface side of the portion  125   b  as shown in  FIG. 11 . 
         [0124]    By arranging the evaporator  191  at the back  111  side of the display apparatus  1 , the display apparatus  1  does not need to be enlarged in the height direction. Further, by arranging the evaporator  191  to the back  111  side instead of the undersurface side  114  of the display panel  11 , the circulation path  92  can be shortened. 
         [0125]    The evaporator  191  may be arranged at the lower part of the display panel  11 , i.e., the undersurface  114  side of the display panel  11  instead. 
         [0126]    Further, as shown in  FIG. 13 , the evaporator  191  is arranged near the portion  125   b  of the back wall  125 . Thereby, the area near the lower end of the back wall  125  is cooled with the evaporator  191 . Hereafter, the portion  125   b  is called a “cooled portion”. 
         [0127]    As shown in  FIG. 10  and  FIG. 11 , the condenser  192  is arranged in the housing  12  and outside the accommodation part  121 . Specifically, the condenser  192  is arranged between a pair of aeration plates  6 ,  6  under the accommodation part  121  (i.e., the lower part position of the display panel  11 ). 
         [0128]    Moreover, between a pair of aeration plates  6 ,  6 , an air intake and exhaust fan is stationed (not illustrated). This fan pulls air from the vent  61  formed in one of the aeration plate  6  and sends the air into the condenser  192  then discharges the air from the vent  61  in the aeration plate  6  of the other side. Thereby, the heat exhausted from the condenser  192  can be efficiently emitted outside the housing  12 . 
         [0129]    Although by operating the above air conditioner  19 , the temperature rise in the display panel  11  is suppressed, in a situation where the sunlight does not enter the display panel  11  such as nighttime, the operation may make the temperature of the panel  11  extremely low, and may cause trouble. Further, it is undesirable in view of power consumption to operate the air conditioner more than necessary. 
         [0130]    Therefore, the display apparatus  1  has a light detector  41  and the controller  42  as shown in  FIG. 33 . And as shown in  FIG. 34 , the light detectors  41  are arranged in every corner of the housing  12 , and all of the four detectors  41  are arranged in the back side of the front wall  124 , and in the position which is illuminated by the sunlight entering from the front side of the front wall  124 . 
         [0131]    In detail, two light detectors  41  which are shown in right-hand side of  FIG. 34  are arranged between the aeration way  123  and the front wall  124  (see  FIGS. 35 ,  36 , and  37 ). One of them is arranged near the upper end, and the other is arranged near the lower end of the aeration way  123 . The other two light detectors  41  which are shown in left-hand side of the  FIG. 34  are arranged between the aeration way  122  and the front wall  124 , as well as those in the right-hand side. Thus, the intensity of the light entering the front wall  124  from the front side, in other words the intensity of the light entering the display panel  11  is detected by the light detector  41 . 
         [0132]    Controller  42  controls the air conditioner  19  based on the light intensity detected by the light detector  41  so that the temperature of the display panel  11  does not become too high or low. Further, since there are four light detectors  41 , the controller  42  may control the air conditioner  19  based on the average value of the light intensity detected by each of the detectors  41 . 
         [0133]    For example, when the light intensity detected by the light detector  41  is larger than a predetermined value L, the controller  42  operates the air conditioner  19 , and when the light intensity detected is smaller than the predetermined value L, the controller  42  stops the operation of the air conditioner  19 . Here, the predetermined value L is determined based on the cooling efficiency of the air conditioner  19  or outside temperature, etc. 
         [0134]    Further, the controller  42  may control the air conditioner  19  not only by the light intensity detected by the light detector  41  but also by the temperature in the first accommodation part  121  or outside temperature measured by a temperature sensor. 
         [0135]    As a heat exchanging means for collecting a heat from the air inside the circulation path  92 , other means may be used instead of the evaporator  191  and the condenser  192 . Further, as a means for air intake and exhaust from the vent  61 , other means may be used instead. 
         [0136]    Furthermore, in this embodiment, the aeration plate  6  and the housing  12  are formed as different components, and the vent  61  is formed in the aeration plate  6 . However, the vent  61  may be formed in the housing  12  without the aeration plate  6 . 
       Circulating Fan  18 , 181   
       [0137]    The circulating fans  18 ,  181  are fans for circulating the air in the circulation path. The circulating fan  18  is arranged at the back  111  side of the display panel  11 , near the upper surface  113  of the display panel  11 , as shown in  FIG. 10  and  FIG. 11 . In other words, the circulating fan  18  is arranged at the upper end of the path part  11   c  of the circulation path  92 . And the circulating fan  18  moves the air in the path part  11   c  to the lower portion, as shown in  FIG. 12 . 
         [0138]    The circulating fan  181  is arranged at the back  111  side of the display panel  11 , and near the evaporator  191 , in the accommodation part  121 . In this embodiment, as shown in  FIG. 10  and  FIG. 11 , the circulating fan  181  is arranged above the evaporator  191  in the lower end of the path part  11   c , and sends an air towards the evaporator  191 , as shown in  FIG. 13 . 
         [0139]    Thereby, the air in the circulation path  92  circulates around the display panel  11  in the direction of the solid line arrow, as shown in  FIG. 12  and  FIG. 13 . Hence, by driving the circulating fan  18 ,  181 , the air in the path part  11   a  can flow from the bottom up in the perpendicular direction, as shown in  FIG. 12 . The air then passes along the path part  11   b , and flows into the path part  11   c . Then the air flows downward along the path part  11   c , as shown in  FIG. 13 , and returns to the path part  11   a  through the path part  11   d.    
         [0140]    According to the circulating fans  18  and  181 , it can lead an air in the path part  11   a  along the front surface  112  of the panel  11  to the path part  11   c  along the back  111  efficiently. 
       Radiating Fin  14   
       [0141]    The radiating fin  14  is arranged in the aeration way  122 , as shown in  FIG. 8 , and is connected to the protrusion part  131  which protrudes into the aeration way  122  among the heat pipes  13 . In this embodiment, the radiating fin  14  is formed by aluminum. 
         [0142]    According to the above mentioned radiating fin  14 , the heat dissipation efficiency from the heat pipe  13  to into the aeration way  122  and  123  increases, and, as a result, the cooling efficiency of the display apparatus  1  increases. 
         [0143]    Aeration Fans  15  and  16   
         [0144]    The aeration fans  15  and  16  are arranged in the aeration way  122 , as shown in  FIG. 3 . The aeration fan  15  is arranged at the upper end  122   a  of the aeration way  122 , and the aeration fan  16  is arranged at the lower end  122   b  of the aeration way  122 . 
         [0145]    The aeration fans  15  and  16  pass the air in the aeration way  122  to the same direction along the aeration way  122 . That is, the aeration fan  15  passes the air in the aeration way  122  from the bottom up, by emitting the air to the outside of the housing  12  from the vent, as shown in  FIG. 5 . The aeration fan  16  passes the air in the aeration way  122  from the bottom up, by pulling the air outside of the housing  12  from the vent  61 , as shown in  FIG. 6 . In  FIG. 5  and  FIG. 6 , the flow of the air is shown by the solid line arrows. 
         [0146]    The aeration fans  15  and  16  are arranged in the aeration way  123  as well as in the aeration way  122  (see  FIG. 3 ), and these fans move the air in the aeration way  123  from the bottom up. 
         [0147]    According to the above mentioned aeration fans  15  and  16 , the heat emitted inside the aeration way  122  and  123  from the heat pipes  13  can be efficiently diffused outside of the housing  12 . Therefore, the radiating efficiency of the heat pipe  13  and the radiating fin  14  are increased in the aeration way  122 . 
         [0148]    Further, in this embodiment, since the air in the aeration way  122  and  123  flows from the bottom up, the air can flow efficiently upwards since the warm air has a natural tendency for going up. Therefore, the heat emitted to the aeration way  122  and  123  can be efficiently diffused to the outside of the housing  12 . 
         [0149]    In this embodiment, though the aeration fans  15  and  16  are used as blowing means to exhaust the air in the aeration way  122  or  123  outside of the housing  12 , other similar means may be adopted. 
       Heat Insulator  7   
       [0150]    As shown in  FIG. 13 , a heat insulator  7  is placed between the evaporator  191  and the display panel  11 . In detail, the evaporator  191  is arranged at the back  111  side of the display panel  11 , and the heat insulator  7  is arranged between the back  111  and the front  191   a  of the evaporator  191 . A rubber material such as a silicon or urethane may be used as a material for the heat insulator  7 . 
         [0151]    As described above, the heat from the display panel  11  is transmitted to the evaporator  191  by an air flowing inside the circulation path  92 , and is collected by the evaporator  191 . According to the heat insulator  7 , it can prevent an over cooling of the display panel  11  near the evaporator  191 . Therefore, the temperature distribution of the display panel  11  can be uniformalized, and accordingly can keep the display panel  11  in good condition. 
         [0152]    Heat Collecting Fin  71 , First Blowing Fan  72 , and Second Blowing Fan  73   
         [0153]    As shown in  FIG. 13  and  FIG. 16 , a heat collecting fin  71  is arranged at the back side of the evaporator  191  among the back of the hack wall  125 . The heat collecting fin  71  functions as a heat collecting means, and it collects heat from the air in the back side of the back wall  125 . Since the heat collecting fin  71  is arranged at the back side of the cooled portion  125   b  (which is at the back side of the evaporator  191 ), the heat collected by the heat collecting fin  71  is collected by the evaporator  191 , and thereby the back side air of the cooled portion  125   b  is cooled efficiently. 
         [0154]    Further, as shown in  FIG. 13  and  FIG. 17 , the first blowing fan  72  is arranged at the back of the back wall  125  near the upper part of the heat collecting fin  71 . The first blowing fan  72  functions as a blowing means, and passes the air in the back side of the back wall  125  to the back side of the cover component  23  consisting the back wall of the second accommodation part  22 . The first blowing fan  72  is arranged at the back side of the cooled part  125   b  and above the heat collecting fin  71 . As shown by an arrow D 1  of  FIG. 17 , the first blowing fan  72  blows air up in the perpendicular direction. 
         [0155]    Since the cooled portion  125   h  and the cover component  23  are aligned in substantially perpendicular direction (see  FIG. 11  and  FIG. 13 ), the air in the back side of the cooled portion  125   b  (i.e. the air cooled by the evaporator  191 ) is lead to the back side of the cover component  23  only by blowing the air in perpendicular direction by the first blowing fan  72 . 
         [0156]    Thereby, the rise in heat of a circuit board  11   e  arranged in the second accommodation part  22  is suppressed. 
         [0157]    Further, in effort of the heat collecting fin  71 , much cool air is can be led to the back side of the cover component  23 , and thus the second accommodation part  22  is further cooled. 
         [0158]    As shown in  FIG. 15  and  FIG. 17 , the second blowing fan  73  is arranged at the back side of the back wall  125  of the second accommodation part  22 . The second blowing fan  73  functions as a blowing means, and generates the flow of the air inside the second accommodation part  22 . 
         [0159]    As shown in  FIG. 15 , three blowing fans  73  are arranged inside the second accommodation part  22 , and all of the fans blow the air from the bottom up as shown in arrows D 2  of  FIG. 15 . Thereby, the air inside the accommodation part  22  can flow from the bottom up, as shown in  FIG. 11 . 
         [0160]    As mentioned above, ventilation openings  26  and  27  are formed in the lower part and the upper part cover component  23  respectively. By operating the second blowing fan  73 , air in the second accommodation part  22  flows from the opening  26  to the opening  27  as shown in  FIG. 11 . 
         [0161]    Therefore, a cold air is inhaled from the opening  26 , and the heat from the circuit board  11   e  is emitted from the opening  27 . 
         [0162]    Further, since the air cooled by the evaporator  191  is led to the back side of the cover component  23  by the first blowing fan  72 , the cooled air is inhaled inside the second accommodation part  22  from the ventilation opening  26 , and thus the circuit board  11   e  is cooled. 
         [0163]    Therefore, according the heat collecting fin  71 , the first blowing fan  72 , and the second blowing fan  73 , the temperature rise in the circuit board  11   e  is inhibited. Thus a heat trouble in the circuit board is reduced. 
         [0164]    Although the heat collecting fin  71  is used as a heat collecting means, and blowing fans  72 ,  73  are used as blowing means for cooling the circuit board  11   e , other means may be used instead. 
         [0165]    Instead of leading the air in the back side of the cooled portion  125   b  to the back side of the cover component  23  by the first blowing fan  72  as described above (see  FIG. 16 ), the air in the back side of the cover component  23  may be lead to the back side of the portion  125   b  by the fan  72 . In this case, the air inside the second accommodation part  22  is flown from the top down. Thereby, the heat from the circuit board  11   e  is led to the back side of the portion  125   b  and cooled by the heat collecting fin  71  and the evaporator  191 . 
         [0166]    Further, the first blowing fan  72  may be arranged under the heat collecting fin  71 , instead of above the fin  71 . 
         [0167]    3. Composition for Attaching the Display Apparatus to the Support Stand 
         [0168]    As shown in  FIG. 18 , a pole-shaped engaging component  81  which protrudes from the back of the display apparatus  1  is attached on the back of the display apparatus, and an extended component  811  for enlarging the protrusion from the back of the display apparatus  1  is removably attached on the tip of the engaging component  81 . In detail, a screw is formed in the base of the extended component  811  while a screw hole is formed in the tip of the engaging component  81 , and by engaging the screw with the screw hole, the extended component  811  is attached at the tip of the engaging component  81  (see  FIG. 21 ). 
         [0169]    In this embodiment, four engaging components  81  are arranged at the back of the display apparatus  1 , and these engaging components  81  are attached to both side edges two by two, one on the top and the other on the bottom. 
         [0170]    Further, as shown in  FIG. 22 , a pair of side wall parts  211 , 211  of the frame part  21  has a ring like engaged component  82  attached on its inner circumference through the elastic rubber component  84 . Here, the engaged component  82  is engaged to the engaging component  81  attached to the display apparatus  1 . In this embodiment, as shown in  FIG. 22 , four engaged components  82  are attached to the side wall parts  211 , 211  corresponding to each of the four engaging components  81  attached to the display apparatus  1 . 
         [0171]    When attaching the display apparatus  1  to the support stand  2 , first, the extended component  811  attached on the engaging component  81  is inserted into the corresponding engaged component  82  from the tip, as shown in  FIG. 21  and  FIG. 23 . Then, the display apparatus  1  is pushed into the frame part  21 . 
         [0172]    Thereby, the engaging component  81  is guided to the engaged component  82  by the extended component  811 , and fits into the engaged component  82 . As a result, the engaging component  81  and the engaged component  82  are engaged in a condition where the display apparatus  1  is inserted to the frame part  21 . Thus, the extended component  811  assists the insertion (or fitting) of the engaging component  81  to the engaged component  82 . 
         [0173]    After the engaging component  81  is fitted to the engaged component  82 , the extended component  811  is removed as shown in  FIG. 24 . And as shown in  FIG. 25 , the engagement sustaining component  83  is attached to the tip part of the engaging component  81  fitted to the engaged component  82  in a detachable form. In detail, a screw is formed in the engagement sustaining component  83 , and engaging the screw with a corresponding screw hole formed in the engaging component  81 , the engagement sustaining component  83  is attached at the tip of the engaging component  81 . 
         [0174]    When engagement sustaining component  83  is attached to the tip of the engaging component  81 , it contacts the opening end side  82   a  of the engaged component  82 . Thereby, the engaging of the engaging component  81  and the engaged component  82  is held by the engagement sustaining component  83 . 
         [0175]    According to the above mentioned structure, a position of the display apparatus  1  when inserted to the frame part  21  can be fixed only by engaging the engaging component  81  and the engaged component  82 . Therefore, the positioning of the display apparatus  1  can be simplified. Further, by sustaining the engagement of the engaging component  81  and the engaged component  82  by the engagement sustaining component  83 , the display apparatus  1  can be fixed to the support stand  2 . 
         [0176]    Further, in this embodiment, since the engaged component  82  is attached to the frame part  21  through the elastic component  84 , even if a vibration is added to a display system, this vibration is absorbed by the elastic component  84 . 
         [0177]    Therefore, transfer of the vibration to the display apparatus  1  from the frame part  21  can be prevented, and a breakage of the display apparatus  1  by vibration can be prevented. 
         [0178]    Preferably, the prevention component  85  having L-shaped structure may be fixed to the engaging component  82  as shown in  FIG. 27  and  FIG. 28 . In this case, the prevention component  85  has a first flat plate  851  and a second flat plate  852  which are connected L-shaped, and the second flat plate  852  is screwed to the engaged component  82  so that the first flat plate  851  overlaps the back of the frame part  21 . Further, the prevention component  85  is fixed to the engaged component  82  so that it does not deteriorate the absorbing function of the elastic component  84 . 
         [0179]    According to the composition such that the prevention component  85  is fixed to the engaging component  82  as described above, by securing the engagement of the engaging component  81  and engaged component  82  by the holding component  83  as shown in  FIG. 29 , the prevention component  85  is connected to the display apparatus  1 . 
         [0180]    Therefore, even if the elastic component  84  become depleted and the display apparatus  1  cannot be fixed to the frame part  21 , since the first plate  851  of the prevention component  85  contacts with the back of the frame part  21 , it can prevent the display apparatus  1  from falling forward. 
         [0181]    Further, since fluorescent light fittings  5 , and backboard  3  are arranged at the back side of the display apparatus  1 , even if the display apparatus  1  is inadvertently released from the frame part  21 , it can prevent the apparatus  1  from falling to the back side. 
         [0182]    The present invention is not limited to the foregoing embodiment but can be modified variously by one skilled in the art without departing from the spirit of the invention as set forth in the appended claims. For example, the technology mentioned above is applicable not only to the liquid crystal displays, but also to the other plane-surface type displays, such as plasma displays, or organic electroluminescence (Electro-Luminescence) displays.