Abstract:
Provided is a display device that is exceptionally easy to assemble. A display device includes an electroconductive housing. A case body accommodates the display device. A connecting member causes electrification between the housing of the display device and a grounding part of a circuit substrate. The connecting member has a base part that contacts the housing, and an elastic contact armature that contacts the grounding part of the circuit substrate when the circuit substrate is secured to the case body. A securing member secures the display device to the case body so that the base part is held between the housing and the case body. The case body has an elastic locking armature for securing the circuit substrate. The case body has a through-hole through which the elastic contact armature of the connecting member is inserted.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the U.S. National Phase of PCT/JP2013/052645 filed Feb. 6, 2013, which claims priority from Japanese Patent Application No. 2012-030907 filed Feb. 15, 2012. The subject matter of each is incorporated by reference in entirety. 
     TECHNICAL FIELD 
     The present invention relates to a display device that prevents a display from taking an electrical charge. 
     BACKGROUND ART 
     Conventionally, a liquid crystal display device has a rectangular shape metal frame, and several claw portions formed at the metal frame are inserted into holes formed at a circuit board. Each claw portions are bent so that the metal frame is connected to a ground pattern, and the liquid crystal display device is fixed by the metal frame. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Unexamined Patent Application Publication No. 5-188388 
     SUMMARY OF INVENTION 
     Technical Problem 
     An object of the present invention is to provide a display device excellent in assembling. 
     Solution to Problem 
     The first feature of the present invention is that a display device comprising: a display configured to have a conductive box case; a case configured to accommodate the display; and a connecting member configured to conduct the box case of the display and a ground of a circuit board; wherein the connecting member consisting an elastic contact armature, and the elastic contact armature configured to contact with the ground of a circuit board upon the circuit board is fixed to the case. 
     The second feature of the present invention is that a display device comprising: a display configured to have a conductive box case; a case configured to accommodate the display; and a connecting member configured to conduct the box case of the display and a ground of a circuit board, a static electricity is discharged from the display to the circuit board; wherein the connecting member consisting a base configured to contact with the box case and an elastic contact armature configured to contact with the ground of a circuit board upon the circuit board is fixed to the case, and a fix member fixing the display to the case as the base is to be sandwiched between the box case and the case. 
     The third feature of the present invention is that the case further comprising an elastic locking armature configured to fix the circuit board. 
     The fourth feature of the present invention is that the base further comprising a concave configured to dispose the base of the connecting member. 
     The fifth feature of the present invention is that the case further comprising a through hole configured to insert the elastic contact armature of the connecting member. 
     The sixth feature of the present invention is that the case further comprising a positioning member configured to position the circuit board. 
     The seventh feature of the present invention is that the case further comprising a bottom wall configured to fix the display and a height of the elastic armature projecting from the back of the bottom wall is shorter than a height of the positioning member while the circuit board is not fixed to the case. 
     Advantageous Effects of Invention 
     As described above, according to the present invention, a display device configures to be excellent in assembling a case to circuit board and conducting a box case to a ground of the circuit board. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a cross-sectional view of a display device according to a first embodiment of the present invention. 
         FIG. 2  is a cross-sectional view of a main part of a display device according to a first embodiment of the present invention. 
         FIG. 3  is a top and cross-sectional view of a connecting member according to a first embodiment of the present invention. 
         FIG. 4  is a cross-sectional view of a display device according to a first embodiment of the present invention. 
         FIG. 5  is a cross-sectional view of a display device according to a first embodiment of the present invention. 
         FIG. 6  is a cross-sectional view of a main part of a display device according to a second embodiment of the present invention. 
         FIG. 7  is a top and cross-sectional view of a connecting member according to a first embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     With reference to attached drawings  FIG. 1  to  FIG. 5 , a first embodiment of the invention will be described below with an example of a cluster for a motor vehicle comprising a liquid crystal display  10 , a case  20 , a connecting member  30 , a circuit board  40 , a front cover  80 , and a rear cover  90 . 
     The liquid crystal display  10  comprises a liquid crystal panel  11 , a housing  12 , a box case  13 , and a flexible electric wiring member  14 . The liquid crystal panel  11  is a liquid-crystal display formed of a thin film transistor (TFT) and a liquid crystal cell that polarizers are affixed to both side of the cell. The liquid crystal is insulated into the pair of transparent panel which the transistor is embedded. The liquid crystal panel  11  is illuminated by a light which is store in the housing or a back light which has a light guiding member. A light diffusion member may be placed at the back side of a liquid crystal panel  11 . 
     The housing  12  of the liquid crystal display  10  is formed of a white resin, and the liquid crystal display panel  11  and the back light are stored. The box case  13  of the liquid crystal display  10  is formed of a conductive material such as metal, and comprises a front box case  13   a  and a rear box case  13   b . The front box case  13   a  is formed to have an opening corresponding to the display of the liquid crystal display panel  11  in of a rectangle shape. The front box case  13   a  is fixed to the rear box case  13   b  with a hook (not shown), and the front box case  13   a  and the rear box case  13   b  are connected to each other to have electrical conductivity. 
     A flexible electric wiring member  14  is consisted of a flexible base film with designated pattern so as to be called a FPC. A distal part of the flexible electric wiring member  14  is connected to the liquid crystal display panel  11  and an illumination device, and the other distal part is connected to a connector  41  of the circuit board  40 . The liquid crystal display  10  is provided electric power form the circuit board  40  through the flexible electric wiring member  14 , and input a designated data from an input control unit mounted on the circuit board  40 , and displays remaining fuel amount and travel distance on the display of the liquid crystal display panel  11 . 
     A case  20  is formed of white resin and having the liquid crystal display  10  in a space formed with a side wall  21  and a bottom wall  29 . The liquid crystal display  10  is fixed to the front side of the bottom wall  29 . The bottom wall  29  of the case  20  has a rectangular shape hole that the elastic contact armature of the connecting member  30  passes thought, and a round shape hole that the screw  70  passes though and a rectangular shape hole that the flexible electric wiring member  14  passes though. The base  31  of the connecting member  30  is placed inside of a concave portion  27  which is a part of the bottom wall  29 . 
     The case  20  is provided with the positioning member  22 , the elastic locking armature  23 , and the wall portion  26  to abut the side of the liquid crystal display  10 . The positioning member  22  and elastic locking armature  23  are provided at the back of the bottom wall  29 , and have designated height H3. 
     The positioning member  22  of the case  20  has a base  22   a  and projection part  22   b . The base  22   a  of the positioning member  22  forms columnar and the height of the base  22   a  is equal to the height of designated height described later. The projection part  22   b  of the positioning member  22  is projecting from the base  22   a  and inserted into a hole  42  of the circuit board  40 . 
     The elastic locking armature  23  of the case  20  is provided with the base  23   a  and a locking hook  23   b . The base  23   a  of the elastic locking armature  23  is rod-shaped and rectangular section, and the height of the base  23   a  that will be described later is a sum of a designated height H1 and a thickness of the circuit board  40 . The base  23   a  of the elastic locking armature  23  is inserted into a hole  43  of the circuit board  40  and the circuit board  40  is hooked to the locking hook  23   b  of the elastic locking armature  23 . The circuit board  40  is fixed to the case  20  with the locking hook  23   b  of the elastic locking armature  23  with the designated height H1 from the bottom wall  29 . The designated height H1 is a total height of the back of the bottom wall  29  to the front of the circuit board  40 . 
     A connecting member  30  is formed by pressing and cutting a thin conductive board. The connecting member  30  includes a base  31  and two elastic contact armatures  32 . The base  31  of the connecting member  30  includes two round shape holes  31   a  which the screws  70  are inserted and two rectangular shape holes  31   b  which are produced when the connecting member  30  is pressed. Both round shape holes  31   a  and rectangular shape holes  31   b  are located in where they are bilateral symmetry. 
     The base  31  of the connecting member  30  is placed in the concave portion  27  and sandwiched between the rear box case  13   b  of the liquid crystal display  10  and the bottom wall  29  of the case  20 . Together with the liquid crystal display  10 , the connecting member  30  is fixed to the bottom wall  29  of the case  20  with two screws  70 . The connecting member  30  is fixed to the case  20  so that the elastic locking armatures  23  are bilateral symmetry with a central line S as an axis. The base  31  of the connecting member  30  attaches to rear box case  13   b  nearby the round shape holes  31   a.    
     The distal portion  32   a  of the elastic contact armatures  32  is curved to attached the ground pattern  44  of the circuit board  40 . The other distal portion  32   b  of the elastic contact armatures  32  are situated sequentially to the base  31 . The two elastic contact armatures  32  are bilateral symmetry. The elastic contact armatures  32  of the connecting member  30  are inserted into a hole  24  of the case  20  and project the designated height H2 from the bake surface of the bottom wall  29  before the circuit board  40  is fixed to the case  20  (see  FIG. 4 ). 
     The designated height H2 is slightly taller than the designated height H1 and slightly shorter than the designated height H3. When the circuit board  40  is fixed with the elastic locking armature  23  to the liquid crystal display  10  and the connecting member  30 , the distal portion  32   a  of the elastic contact armatures  32  of the connecting member  30  is pressed, and the elastic locking armature  23  is bent at the other distal portion  32   b.    
     The circuit board  40  is formed of glass reinforced plastics with copper tracks in the place of wires. The connector  41  is mounted on the back of the circuit board  40  so that the other distal portion of a flexible electric wiring member  14  can be connected. The flexible print wiring member  14  is inserted into the hole  28  of the case  20 , and the distal part is connected to the liquid crystal display  10  and the other distal part is connected to the circuit board through the connector  41 . 
     The circuit board  40  includes a round shape hole  42  corresponds to the positioning member  22  and a rectangular shape hole  43  corresponds to the elastic locking armatures  23  of the case  20 . The projection part  22   b  of the positioning part  22  is inserted into the hole  42  of the circuit board  40 . The elastic locking armatures  23  is locked to the hole  42  of the circuit board  40 . A ground pattern  44  is mounted on the surface of the circuit board  40 . Although the ground pattern  44  of the circuit board  40  is made of a soldering layer in this embodiment, the soldering layer is not necessary to be placed. The distal portion  32   a  of the elastic contact armatures  32  attaches to the ground pattern  44  of the circuit board  40 . 
     The circuit board  40  is fixed by the elastic locking armature  23  to the case  20  which the liquid crystal display  10  and the connecting member  30  are fixed, and the elastic contact armatures  32  of the connecting member  30  are electrically connected to the ground pattern  44  of the circuit board  40 . When the circuit board  40  is fixed to the case  20 , the elastic locking armature  23  is deformed elastically and the distal portion  32   a  of the elastic locking armature  23  is pressed to the ground pattern  44  of the circuit board  40 . With the connecting member  30 , the box case  13  of the liquid crystal display  10  and the ground pattern  44  of the circuit board  40  are electrically connected. 
     A front cover  80  is formed of opaque resin, and consists of a rectangular shape opening  81  corresponding to the display of the liquid crystal display  10 . The front cover  80  is fixed to a back cover  90  with an elastic locking armature  82 . The back cover  90  is formed of opaque resin, and covers the back of the circuit board  40 . The back cover  90  is fixed to the case  20  with the screws which are not shown in this embodiment. 
     With reference to attached drawings  FIG. 6  and  FIG. 7 , a second embodiment of the invention will be described below with an example of a cluster for a motor vehicle comprising the liquid crystal display  10 , the case  20 , the connecting member  30 , the circuit board  40 , the front cover  80 , the rear cover  90  and a flange portion  131   c  provided at a base  131  of a connecting member  130 . 
     A connecting member  130  is provided by pressing and cutting a thin conductive board. The connecting member  130  includes a base  131  and two elastic contact armatures  132 . The connecting member  130  is fixed to the case  20  with the screw  70  so that the base  131  is sandwiched between the box case  13  of the liquid crystal display  10  and the case  20 . The base  131  of the connecting member  130  includes a round shape hole  131   a  which the screws  70  are inserted, a rectangular shape holes  131   b  which was opened when the connecting member  130  was pressed and cut, and a flange portion  131   c . A distal portion  132   a  of the elastic contact armatures  132  is curved to come in contact with the ground pattern  44  of the circuit board  40 . The other distal portion  132   b  of the elastic contact armatures  132  are situated sequentially to the base  131 . 
     According to the first and second embodiments, fixing the circuit board  40  to the case  20  and electrically connecting the ground pattern  44  of the circuit board  40  to the box case  13  of the liquid crystal display  10  may be processed at the same time. The static electricity charged on the liquid crystal display  10  is discharged through the connecting member  30  and the circuit board  40 . 
     The height of the elastic armature  32  (H2) projecting from the back of the bottom wall  29  is desirably shorter than the height of the positioning member  22  (H3) when the circuit board  40  is not fixed to the case  20 . As shown in  FIG. 5 , when positioning the projection part  22   b  of the positioning member  22  to the hole  42  of the circuit board  40 , the elastic contact armatures  32  attaches the circuit board  40  so that the elastic contact armatures  32  does not obstruct an assembly of the circuit board  40 . 
     In other words, it is not desirable that if the height of the elastic contact armature  32  (H2) projecting from the back of the bottom wall  29  is taller than the height of the positioning member  22  when the circuit board  40  is not fixed to the case  20 . If the elastic contact armatures  32  attaches the circuit board  40  before positioning the projection part  22   b  to the hole  42  of the circuit board  40 , it may disturb an assembly of the circuit board  40 . 
     In the first and second embodiment, the display was explained as liquid crystal display  10  that is provided with the liquid crystal panel  11 . The display may be explained as Organic Electro-Luminescence display that is provided with an Organic Electro-Luminescence panel. In the first and second embodiment, the circuit board  40  was fixed to the case  20  with the elastic locking armature  23 , but the circuit board  40  may be fixed to the case  20  with screws. 
     INDUSTRIAL APPLICABILITY 
     The present invention may be applied to a display device configures to be excellent in assembling a case to circuit board and conducting a box case to a ground of the circuit board. 
     REFERENCE SIGNS LIST 
     
         
           10 : liquid crystal display 
           13 : box case 
           20 : case 
           22 : positioning member 
           23 : elastic locking armature 
           24 : hole 
           27 : concave portion 
           30 : connecting member 
           31 : base 
           32 : elastic contact armature 
           40 : circuit board 
           44 : ground pattern 
           70 : screw 
           130 : connecting member 
           131 : flange portion 
           132 : elastic contact armature