Abstract:
The objective is to provide technology reducing effect on battery performance by heat release source, even if many electronic components are arranged densely. In this liquid crystal display device, a battery ( 70 ) configured from nine cells ( 71 ) is attached to a battery arranging face ( 73 ) of backlight chassis ( 60 ). A hole ( 72 ) is formed at the entire battery arranging face ( 73 ). A light source is attached to rear face bottom of backlight chassis ( 60 ). Heat of light source is transferred by the backlight chassis ( 60 ) and transmitted to the battery ( 70 ) attached to the battery arranging face ( 73 ). However, as the hole ( 72 ) is formed at the entire battery arranging face ( 73 ), heat transmitted by the backlight chassis ( 60 ) is insulated by the hole ( 72 ) at the entire battery arranging face ( 73 ) and difficult to be transmitted to the battery ( 70 ), thus making it possible to prevent cell ( 71 ) deterioration.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a liquid crystal display device and, in particular, to a portable liquid crystal display device which has a battery. 
       BACKGROUND ART 
       [0002]    Conventionally, a battery is frequently used as a power source of portable electronic equipment. In general, the battery is configured from a plurality of chargeable cells. Since the cell is liable to be deteriorated in a high-temperature environment, the cell positioned near a heat release source is more likely to be deteriorating and run out the remaining amount than other cells. Since the cells could undergo damage or the like when being subjected to over discharge, at the time when the remaining amount of any cell runs out, it is necessary to stop discharge even if other cell has the remaining amount. When the cells are charged in this state, balance of the remaining amount between the cells is lost, so that a difference is caused in timing of being fully charged between the cells. Since the cell could undergo damage or the like by over discharge, at the time when any cell becomes fully charged, it is necessary to stop charging of other cell. As a result, the charging balance between the cells is further lost and performance of the entire battery is deteriorated. 
         [0003]    Therefore, for example, portable electronic equipment has been known that a heat-insulating space is provided by arranging a CPU and a battery adjacent to the CPU separately to reduce the effect that heat from the CPU which is a heat release source imposes on battery performance (for example, refer to Patent Literature 1). 
       CITATION LIST 
     Patent Literature 
       [0000]    
       
         PATENT LITERATURE 1: Japanese Laid-Open Patent Publication No. 2007-122132 
       
     
       SUMMARY OF INVENTION 
     Technical Problem 
       [0005]    However, recent electronic equipment has a problem that along with an increase in functionality and a reduction in size, many electronic components are arranged densely in the electronic equipment and a space for the heat-insulating space like in Patent Literature 1 is difficult to be secured. 
         [0006]    The present invention has been made in view of the above-described problem, and aims to provide a technology which is capable of reducing the effect that a heat release source imposes on battery performance, even if many electronic components are arranged densely. 
       Solution to Problem 
       [0007]    A liquid crystal display device of the present invention comprises a backlight chassis to which a light source is attached, a battery arranging face provided on a face opposite to a face to which the light source of the backlight chassis is attached, a hole formed at the battery arranging face, and a battery attached to the battery arranging face. Moreover, the hole may be formed corresponding to a cell constituting the battery. Moreover, the hole may be formed larger as a distance from the light source is closer. Moreover, the hole may have a shape that enables to adjust an opening area. Moreover, the battery may be covered with a black package and attached in close contact to the battery arranging face. 
       Advantageous Effects of Invention 
       [0008]    According to the present invention, it is possible to reduce the effect that a heat release source imposes on battery performance, even if many electronic components are arranged densely. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0009]      FIG. 1  are plan views and a side view showing an appearance of a liquid crystal television according to an embodiment of the present invention. 
           [0010]      FIG. 2  is an exploded perspective view showing an appearance of the liquid crystal television shown in  FIG. 1 . 
           [0011]      FIG. 3  are a front view and a perspective view of a backlight chassis shown in  FIG. 2 . 
           [0012]      FIG. 4  is a simplified side view of the backlight chassis shown in  FIG. 2 . 
           [0013]      FIG. 5  are a front view and a perspective view of the backlight chassis of other embodiment shown in  FIG. 2 . 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0014]    Description will hereinafter be given specifically for an embodiment of the present invention with reference to drawings. In the present embodiment, description will be given for a liquid crystal television  10  as an example of a liquid crystal display device. 
         [0015]      FIG. 1  are views showing an appearance of the liquid crystal television  10  according to the present embodiment. Moreover,  FIG. 2  is an exploded perspective view of the liquid crystal television  10 . The liquid crystal television  10  is provided with as an exterior a frame-shaped frame  20  which is an exterior side face cabinet, a transparent protection cover  30  on the front side, and a rear cabinet  40  on the rear side. In addition, inside the exteriors, a front cabinet frame  35 , a sheet group  50  and a backlight chassis  60  are arranged from the side of the transparent protection cover  30 . 
         [0016]    The frame  20  is a molded component by a metallic processing member (by processing extruded material or drawing material). For example, in the case of a 20-inch class, a rough size is about 490 mm width×about 290 mm height. 
         [0017]    The transparent protection cover  30  is, for example, a glass plate and protects the sheet group  50 . The rear cabinet  40  is molded with resin material. 
         [0018]    The front cabinet frame  35  is molded with resin material to have the substantially same size and shape with the frame  20 , and is attached to the rear face side of the frame  20 . Note that, in the frame  20 , a cylindrical positioning projection portion  25  is formed at a predetermined position to extend in a back direction. On the front face side of the front cabinet frame  35 , a positioning boss hole  37  is provided corresponding to the positioning projection portion  25 . 
         [0019]    The sheet group  50  has a liquid crystal panel  51 , a Df sheet  52 , a lens sheet  53 , a light guide plate  54 , a diffusion sheet  55 , and a reflection plate  56  arranged in a laminated form from the front side. 
         [0020]    The backlight chassis  60  is such that a metallic plate-shaped body is processed to have a predetermined shape, in which a light source (for example, an LED edge light), a video image driving circuit, a battery  70  and the like are arranged. 
         [0021]      FIG. 3(   a ) is a front view of the backlight chassis  60  and  FIG. 3(   b ) is a perspective view of the backlight chassis  60 . Note that, in  FIG. 3(   b ), the rear cabinet  40  and the battery  70  are also shown. Moreover,  FIG. 4  is a simplified side view of the backlight chassis  60  and shows a state where the battery  70  and light source  80  are mounted. The backlight chassis  60  has a backlight arranging face  81  provided in the bottom on the rear face side and a battery arranging face  73  provided on the front face side. 
         [0022]    To the backlight arranging face  81 , an LED edge light in which a plurality of LEDs (Light Emitting Diodes) are arranged is attached as the light source  80 . 
         [0023]    To the battery arranging face  73 , the battery  70  configured from nine cells  71  composed of three rows and three columns is attached. At the entire battery arranging face  73 , a hole  72  which has substantially the same size as the battery  70  is formed. The battery  70  is covered with a black package so as not to penetrate light of the light source  80 , and is mounted in close contact to the battery arranging face  73  so that light of the light source  80  does not leak from the hole  72  formed at the battery arranging face  73 . 
         [0024]    The battery arranging face  73  is provided on a face opposite to a face to which the light source  80  is attached in the backlight chassis  60  to reduce the effect by the heat of the light source  80 . Therefore, the heat of the light source  80  attached to the backlight arranging face  81  is transferred to the backlight chassis  60  and is transmitted to the battery  70  attached to the battery arranging face  73 . However, as the hole  72  is formed at the entire battery arranging face  73 , the heat transmitted by the backlight chassis  60  is inhibited from being transferred by the hole  72  formed at the entire battery arranging face  73  and is difficult to be transmitted to the battery  70 . Thus, according to the present embodiment, it is possible to reduce the effect that the heat of the light source  80  imposes on the battery  70  via the backlight chassis  60  and to prevent deterioration of the cells  71 . 
         [0025]    In the meantime, since an ambient temperature becomes higher as a distance is closer to the light source  80 , even when the heat-insulating effect is improved by the hole  72  formed at the entire battery arranging face  73 , there remains some fluctuations in temperature among the cells  71  depending on the arranging position of each cell  71 . Thus, in a backlight chassis  61  shown in  FIG. 5 , the battery arranging face  73  is divided into faces corresponding to the respective cells  71  of the battery  70  (cell corresponding faces  74 ) to perform adjustment so that the heat-insulating effect by the hole  75  formed at each of the cell corresponding faces  74  is increased as a distance is closer to the light source  80 .  FIG. 5(   a ) is a front view of the backlight chassis  61 , and  FIG. 5(   b ) is a perspective view of the backlight chassis  61 . Note that, in  FIG. 5(   b ), the rear cabinet  40  and the battery  70  are also shown. 
         [0026]    In the backlight chassis  61 , the battery arranging face  73  is divided into nine cell corresponding faces  74  in three rows and three columns corresponding to the position of each cell  71  of the battery  70 . Here, the cell corresponding faces  74  are arranged in parallel with the light source  80 . 
         [0027]    At each of the cell corresponding faces  74  in the first row that is the closest to the light source  80 , two holes  75  which are the largest of the holes  75  formed at the cell corresponding faces  74  are formed. At each of the cell corresponding faces  74  in the second row that is the second closest to the light source  80 , two holes  75  which are smaller than the holes  75  formed at the cell corresponding faces  74  in the first row are formed. At each of the cell corresponding faces  74  in the third row that is the third closest to the light source  80 , one hole  75  which has the same size as the holes  75  formed in the second row is formed. That is, at each of the cell corresponding faces  74 , depending on a distance from the light source  80 , the larger hole  75  is formed as a distance is closer to the light source  80 , thus making it possible to prevent the cells  71  closer to the light source  80  from deteriorating before the cells  71  away from the light source  80 . 
         [0028]    Hence, since the heat from the light source  80  is evenly transmitted to each of the cells  71  of the battery  70  via the backlight chassis  61 , it is possible to make degree of deterioration even among the cells  71 . Moreover, by forming the hole  75  at the cell corresponding face  74  corresponding to each of the cells  71 , it is possible to increase strength of the backlight chassis  61  compared to the backlight chassis  60  in which the hole  72  is formed at the entire battery arranging face  73 . 
         [0029]    Note that, the hole  75  formed at the cell corresponding face  74  may be formed so that temperature of each of the cells  71  becomes even, and its shape, size and number may be changed as appropriate. For example, all the holes  75  formed at each of the cell corresponding faces  74  may be in the same chrysanthemum shape (the shape with teeth inside the hole  75 ) so that an opening area is able to be finely adjusted by folding or cutting petals of the chrysanthemum shape, to make temperature even among the cells  71 . Note that, in the same manner, the hole  72  formed at the entire battery arranging face  73  may have teeth inside so that the opening area of the hole  72  is able to be finely adjusted. 
         [0030]    The present invention is not limited to the embodiment described above and, needless to say, can be variously changed without departing from the intention of the present invention. For example, the number and arrangement of the cells constituting the battery  70  may be changed as appropriate. Moreover, the present embodiment may be applied to a liquid crystal monitor and a mobile terminal (a mobile phone or a tablet display device). Note that, same reference numerals are assigned to the component showing the same function in the embodiment described above. 
       REFERENCE SIGNS LIST 
       [0000]    
       
           10  liquid crystal television (liquid crystal display device) 
           20  frame 
           30  transparent protection cover 
           40  rear cabinet 
           50  sheet group 
           60 ,  61  backlight chassis 
           70  battery 
           71  cell 
           72 ,  75  hole 
           73  battery arranging face 
           74  cell corresponding face 
           80  light source 
           81  backlight arranging face