Abstract:
A display device includes a display panel that displays images and comprises a an outer frame, a light irradiating part that irradiates light toward a back surface of the display panel, a heat radiating plate that radiates heat generated by the light irradiating part and is grounded, a plurality of protective members provided along the outer frame of the display panel, wherein at least one of the plurality of protective members is an opposing protective member that opposes the heat radiating plate, and a conductive member interposed between and electrically connects the opposing protective member and the heat radiating plate.

Description:
TECHNICAL FIELD 
     The present invention relates to a display device such as a liquid crystal display device. 
     BACKGROUND TECHNOLOGY 
     Conventionally, in a liquid crystal display device, sheet metal of zero potential and a bezel are electrically connected using a screw as a countermeasure against electrostatic discharge (ESD) or electromagnetic interference (EMI). 
       FIG. 7  is a diagram illustrating a configuration of a rear frame of a conventional liquid crystal display device. 
     A rear frame  180  is configured by combining a top frame  180 A composed of sheet metal, a left frame  180 B likewise composed of sheet metal, a right frame  180 C likewise composed of sheet metal, and a bottom frame  180 D likewise composed of sheet metal. 
     In the rear frame  180 , any one of the frames  180 A to  180 D is grounded. The entire rear frame  180  thereby becomes zero potential. Moreover, because one of the frames  180 A to  180 D is electrically connected to the bezel, the bezel also becomes zero potential. 
     Because the bezel and the rear frame  180  thereby become zero potential, it becomes difficult for electrostatic discharge to occur in the bezel or the rear frame  180 , and it becomes possible to protect components inside the liquid crystal display device from electromagnetic interference. 
     RELATED ART DOCUMENTS 
     Patent Documents 
     [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2007-11012 
     However, in recent years, configuring the rear frame from resin is desirable for cost reduction. However, when the rear frame is configured of resin, the rear frame and the bezel are not electrically connected because resin has insulating properties. In this case, it becomes easier for electrostatic discharge or electromagnetic interference to occur. 
     SUMMARY OF THE INVENTION 
     One or more embodiments of the present invention provide a display device that can enact countermeasures against electrostatic discharge and/or electromagnetic interference even when a rear frame is configured of resin. 
     According to one or more embodiments, a display device may comprise: a display panel that displays images and comprises a an outer frame; a light irradiating part that irradiates light toward a back surface of the display panel; a heat radiating plate that radiates heat generated by the light irradiating part and is grounded; a plurality of protective members provided along the outer frame of the display panel, wherein at least one of the plurality of protective members is an opposing protective member that opposes the heat radiating plate; and a conductive member interposed between and electrically connects the opposing protective member and the heat radiating plate. 
     According to one or more embodiments of this configuration, for example, the conductive member electrically connects the opposing protective member that opposes the grounded heat radiating plate and the heat radiating plate. Because of this, the opposing protective member and the heat radiating plate become zero potential, static electricity becomes less likely to occur in the opposing protective member and the heat radiating plate, and components inside the display device can be protected from electromagnetic interference. 
     As a result, for example, countermeasures against electrostatic discharge and/or electromagnetic interference can be enacted even when a rear frame is configured of resin. 
     According to one or more embodiments, the opposing protective member may comprise an opening, and the conductive member may be interposed between the opposing protective member and the heat radiating plate so as to block the opening. 
     According to one or more embodiments this configuration, for example, because the opening is formed on the protective member opposing the heat radiating plate, and the conductive member contacts the protective member so as to block the opening, a worker or the like looking in the opening can visually recognize if the conductive member is inadvertently not disposed during an assembly process of the display device. 
     According to one or more embodiments, each of the plurality of protective members may comprise: a conductive layer; a plating layer layered on a front surface of the conductive layer; and another plating layer layered on a back surface of the conductive layer, and the opening of the opposing protective member may be formed by applying a burring process to the opposing protective member. 
     According to one or more embodiments of this configuration, for example, the protective member is formed by layering the plating layer on the front and back surfaces of the conductive layer, and the opening of the protective layer opposing the heat radiating plate is formed by applying the burring process. 
     As a result, for example, the conductive layer is exposed in the opening even when the front and back surfaces of the protective member opposing the heat radiating plate are plating layers with conductivity, and the protective member opposing the heat radiating plate and the heat radiating plate can therefore be electrically connected. 
     According to one or more embodiments, the heat radiating plate may comprise a cut and raised portion formed in a direction toward the opposing protective member, and the conductive member may contact the cut and raised portion. 
     As a result, for example, because the cut and raised portion is formed in the direction toward the opposing protective member on the heat radiating plate, a length of the conductive member can be reduced by a height of the cut and raised portion. 
     As a result, for example, a reduction in cost can be provided. 
     According to one or more embodiments, the heat radiating plate may further comprise a raised part formed in a direction toward the opposing protective member, and the conductive member may contact the raised part. 
     According to one or more embodiments of this configuration, because the raised part is formed in the direction toward the opposing protective member on the heat radiating plate, the length of the conductive member can be reduced by a length of the raised part. 
     As a result, for example, a reduction in cost can be provided. 
     According to one or more embodiments, the conductive member may be a gasket having conductivity. 
     As a result, for example, because the conductive material is formed by the conventionally existing gasket having conductivity, there is no need to create a new, dedicated conductive member. A reduction in cost, for example, can therefore be provided. 
     According to one or more embodiments, the conductive member may be elastic. 
     As a result, for example, because the conductive member has elasticity, the conductive member firmly contacts a discharge plate and the protective member opposing the discharge plate. As a result, a firm electrical connection between the discharge plate and the protective member can be performed. 
     According to one or more embodiments of the present invention, countermeasures against electrostatic discharge and/or electromagnetic interference can be enacted even when the rear frame is configured of resin. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating an external appearance of a liquid crystal display device according to one or more embodiments of a first example of the present invention. 
         FIG. 2  is an exploded perspective view illustrating an exploded state of the liquid crystal display device in  FIG. 1  according to one or more embodiments of the first example. 
         FIG. 3A  is an exploded perspective view representing a main portion of a liquid crystal display according to one or more embodiments of the first example. 
         FIG. 3B  is a perspective view illustrating a state where a substrate mounting part and a heat radiating plate are mounted to a rear frame according to one or more embodiments of the first example. 
         FIG. 4  is a perspective view illustrating of a configuration of a main portion of the heat radiating plate according to one or more embodiments of the first example. 
         FIG. 5  is a cross-sectional view along line A-A in  FIG. 1  according to one or more embodiments of the first example. 
         FIG. 6  is a cross-sectional view representing a main portion of a liquid crystal display device according to one or more embodiments of a second embodiment of the present invention. 
         FIG. 7  is a diagram illustrating a configuration of a rear frame of a conventional liquid crystal display device according to one or more embodiments of the second embodiment. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Embodiments of the present invention will be described in detail below using drawings. In the present embodiments a liquid crystal display device is exemplified as a display device relating to the embodiments of the present invention, but the present invention is not limited thereto and may use any device that seeks countermeasures against electrostatic discharge and/or electromagnetic interference. 
     Furthermore, each embodiment described below illustrates a comprehensive or specific example of the present invention. Components, disposed positions and connection modes of the components, and the like illustrated in the embodiments below are but an example and not meant to limit the present invention. Moreover, among the components in the embodiments below, components not described in the independent claims, which provide the highest level description, will be described as optional components. 
     First Example 
     Configuration of Liquid Crystal Display Device 
       FIG. 1  is a perspective view illustrating an example of an external appearance of a liquid crystal display device relating to one or more embodiments of a first example of the present invention.  FIG. 2  is an exploded perspective view illustrating an exploded state of the liquid crystal display device in  FIG. 1 . In  FIGS. 1 and 2 , “X1 direction” represents a left direction and “X2 direction” a right direction. Moreover, “Y1 direction” represents an up direction and “Y2 direction” a down direction. Moreover, “Z1 direction” represents a front direction and “Z2 direction” a rear direction. 
     As illustrated in  FIG. 2 , a liquid crystal display device  10  is provided with a front cabinet  11 , bezels (protective members)  12 A to  12 D, a liquid crystal panel (display panel)  13 , a mold frame  14 , an optical sheet  15 , a light guide plate  16 , a heat radiating plate  17 , a rear frame  18 , and a rear cover  19 . The optical sheet  15  is configured from a plurality of members such as a diffusion plate. 
     The bezels  12 A to  12 D are provided along an outer frame of the liquid crystal panel  13  to protect the outer frame. Among the bezels  12 A to  12 D, the bezel  12 A on a right side is an opposing bezel (opposing protective member) that opposes the heat radiating plate  17 . Therefore, the bezel  12 A on the right side is referred to below as an opposing bezel  12 A. 
     A frame configured from the bezels  12 A to  12 D is formed by mounting the bezel on the right side (i.e., the opposing bezel)  12 A, the bezel  12 B on a left side, the bezel  12 C on a top side, and the bezel  13 D on a bottom side to the outer frame of the liquid crystal panel  13 . 
     The mold frame  14  is a frame for supporting the frame of the liquid crystal panel  13  from a back surface side thereof. As will be described below, a space that disposes the liquid crystal panel  13  and a rib for forming a space that disposes the optical sheet  15  are provided on the mold frame  14 . 
     The light guide plate  16  is provided on the heat radiating plate  17  so that a right end thereof opposes an LED  41  (see  FIG. 4 ). The light guide plate  16  is configured of, for example, acrylic resin or the like, and guides light irradiated from the LED  41  to a reflective sheet that will be described below. 
     The heat radiating plate  17  is formed of metal with high conductivity, such as aluminum or the like. As will be described below, a plurality of LEDs  41  are disposed in a vertical direction on a right side of the heat radiating plate  17 . The heat radiating plate  17  radiates heat generated by each LED  41  into the atmosphere. 
     The rear frame  18  is formed of resin having insulating properties, such as plastic. 
     (Configuration of Main Portion of the Liquid Crystal Display) 
       FIG. 3A  is an exploded perspective view representing a main portion of a liquid crystal display relating to one or more embodiments of the first example of the present invention.  FIG. 3B  is a perspective view illustrating a state where a substrate mounting part  20  and the heat radiating plate  17  are mounted to the rear frame  18 . 
     As illustrated in  FIG. 3A , an opening  18 A into which the substrate mounting part  20  is fitted is formed on the rear frame  18 . The substrate mounting part  20  is formed of a conductive body such as aluminum, and a substrate (not illustrated) mounted with electronic components is mounted on a back surface thereof. The substrate mounting part  20  is fitted into the opening  18 A with the substrate mounted on the back surface thereof. 
     Furthermore, a heat radiating plate mounting part  18 B with a shape that follows an outline of the heat radiating plate  17  is formed on the rear frame  18 . As illustrated in  FIG. 3B , the substrate mounting part  20  and the heat radiating plate  17  make contact when the heat radiating plate mounting part  18 B is mounted on the heat radiating plate  17  in a state where the substrate mounting part  20  is fitted into the opening  18 A. The substrate mounting part  20  and the heat radiating plate  17  are thereby electrically connected. 
       FIG. 4  is a perspective view illustrating an example of a configuration of a main portion of the heat radiating plate  17 . The heat radiating plate  17  is bent 90° relative to a top surface of the heat radiating plate  17  in a bent portion  170  that is parallel to a long direction of the heat radiating plate  17 . A bent portion  171  that extends in the long direction of the heat radiating plate  17  is thereby formed. 
     An LED bar (light irradiating part)  40  is provided on a short direction side of the heat radiating plate  17  on the bent portion  171  so as to irradiate light from the LED  41  toward a short direction of the heat radiating plate  17 . The plurality of LEDs  41  is linearly disposed on the LED bar  40 . This LED bar  40  is disposed along the long direction of the heat radiating plate  17 . The light guide plate  16  is disposed on the heat radiating plate  17  so that a lateral surface thereof follows along the LED bar  40 . 
     Furthermore, a raised part  17 B is formed on the heat radiating plate  17 . Functions of the raised part  17 B will be described below. 
       FIG. 5  is a cross-sectional view along line A-A in  FIG. 1 . In  FIG. 5 , an illustration and description of the front cabinet  11  will be omitted for ease of the description. Moreover, in  FIG. 5 , “X1 direction” represents a left direction and “X2 direction” a right direction of the liquid crystal display device  10 . Moreover, “Y1 direction” represents an up direction and “Y2 direction” a down direction of the liquid crystal display device  10 . Moreover, “Z2 direction” represents a rear direction of the liquid crystal display device  10 . 
     As described above, the heat radiating plate  17  is mounted on a top surface of the rear frame  18 . The light guide plate  16  is disposed on the top surface of the heat radiating plate  17  via a cushion member  34 . The reflective sheet  31  is disposed so as to cover a back surface of the light guide plate  16 . The mold frame  14  is disposed on the light guide plate  16 . 
     The mold frame  14  is provided with a first rib  14 A, a second rib  14 B, and a frame body  14 C. The first rib  14 A secures a region where the liquid crystal panel  13  is disposed by a tip of the first rib  14 A contacting the opposing bezel  12 A. The liquid crystal panel  13  is disposed in this region. 
     The second rib  14 B secures a region where the optical sheet  15  is disposed by contacting an upper front surface of the light guide plate  16 . The optical sheet  15  is disposed in this region. 
     The frame body  14 C supports the liquid crystal panel  13  from a back surface of the liquid crystal panel  13  via a cushion member  32  formed of resin such as a high-density micro-cell polymer sheet (PORON) or silicon. 
     The opposing bezel  12 A is disposed so that an upper portion thereof opposes the heat radiating plate  17 . A cut and raised portion  17 A is formed in a direction toward the opposing bezel  12 A on an end portion of the heat radiating plate  17 . A resin  33  for protecting an inner side of a right portion of the opposing bezel  12 A is disposed between the right portion of the opposing bezel  12 A and the cut and raised portion  17 A. 
     An opening  120  is formed on an upper portion side of the opposing bezel  12 A. A conductive member  30  is disposed between the upper portion side of the opposing bezel  12 A and the cut and raised portion  17 A. This conductive member  30  is configured from, for example, a gasket having conductivity and contacts the upper portion side of the opposing bezel  12 A and the cut and raised portion  17 . The opposing bezel  12 A and the heat radiating plate  17  are thereby electrically connected. 
     When configuring the conductive member  30  from the gasket, the gasket has elasticity. If the conductive member  30  has elasticity, the conductive member  30  firmly contacts the opposing bezel  12 A and the cut and raised portion  17 A due to elasticity. 
     (Operation of the Liquid Crystal Display Device) 
     Next, an operation of the liquid crystal display device according to one or more embodiments will be briefly described. In this liquid crystal display device  10 , lighting the plurality of LEDs  41  (see  FIG. 4 ) emits light from the plurality of LEDs  41 . 
     The light from the plurality of LEDs  41  becomes incident to the lateral surface of the light guide plate  16 . The light incident to the lateral surface of the light guide plate  16  is transmitted inside the light guide plate  16  while being reflected by the reflective sheet  31  and is emitted in a front direction from the top surface of the light guide plate  16 . The light emitted from the top surface of the light guide plate  16  becomes incident to the back surface of the liquid crystal panel  13  after passing through the optical sheet  15 . 
     In the liquid crystal display device  10  of such a configuration, the LED  41  generates heat. This heat is transmitted to the heat radiating plate  17 . The heat transmitted to the heat radiating plate  17  is radiated into the atmosphere. 
     As described above, according to one or more embodiments of the first example of the invention, interposing the conductive member  30  between the opposing bezel  12 A and the heat radiating plate  17  electrically connects the opposing bezel  12 A and the heat radiating plate  17 . 
     Because the opposing bezel  12 A, the bezels  12 B to  12 D electrically connected to the opposing bezel  12 A, and the heat radiating plate  17  thereby become zero potential, it becomes difficult for static electricity to form in the bezels  12 A to  12 D or the heat radiating plate  17 , and it becomes possible to protect components inside the liquid crystal display device  1  (for example, the liquid crystal panel) from electromagnetic interference. 
     As a result, countermeasures against electrostatic discharge and/or electromagnetic interference can be enacted even when the rear frame  18  is configured of resin. 
     Furthermore, a shape of the heat radiating plate  17  does not need to be made complex for screwing because there is no need to screw together the opposing bezel  12 A and the heat radiating plate  17 . As a result, a finishing precision of the heat radiating plate  17  improves, and the heat radiating plate  17  becomes less likely to warp. Because an irradiation range of the LED  41  thereby becomes less likely to change, reduction in image quality on the liquid display panel  13  can be reduced. 
     Furthermore, the conductive member  30  is exposed from the opening  120  because the opening  120  is formed on a front portion of the opposing bezel  12 A. Forgetting to dispose the conductive member  30  in an assembly configuration of the liquid crystal display device  10  can thereby be reduced by a worker or the like looking in the opening  120 . 
     Furthermore, a length of the conductive member  30  can be reduced by a height of the cut and raised portion  17 A because the cut and raised portion  17 A is formed on the heat radiating plate  17 . As a result, a reduction in cost can be provided. 
     In  FIG. 5 , the conductive member  30  can be prevented from falling off if the conductive member  30  is clamped and fixed by the resin  33  and the mold frame  14 . 
     Second Example 
       FIG. 6  is a cross-sectional view representing a main portion of a liquid crystal display device relating to one or more embodiments of a second embodiment of the present invention. This cross-sectional view is a cross-sectional view along line B-B in  FIG. 1 . Moreover, the same reference numerals will be used for the same components as in  FIG. 5  and descriptions thereof omitted. 
     As illustrated in  FIG. 6 , a raised part  17 B is provided in a direction toward an opposing bezel  12 A on a heat radiating plate  17 . As illustrated in  FIG. 4 , this raised part  17 B is configured by a cylindrical metal member being mounted by welding on a top surface of the heat radiating plate  17 . 
     An optical sheet  15  is disposed above the raised part  17 B. Moreover, a light guide plate  16  on which this optical sheet  15  is mounted and a reflective sheet  31  are also disposed above the raised part  17 B. 
     A mold frame  140  supports a liquid crystal panel  13  from a back surface of the liquid crystal panel  13  in the same manner as the mold frame  14  described above. The mold frame  140  has a third rib  14 C. A tip of the third rib  14 C secures a region that disposes the liquid crystal panel  13  by contacting the opposing bezel  12 A. 
     A cushion member  32  formed of resin such as high-density micro-cell polymer sheet (PORON) or silicon is disposed on a front surface and the back surface of the liquid crystal panel  13  and protects the front and back surfaces of the liquid crystal panel  13 . 
     The heat radiating plate  17  has a bent portion  17 C configured by bending a metal plate, which increases a surface area of the heat radiating plate  17 . A radiating effect of the heat radiating plate  17  is thereby improved. 
     Meanwhile, an opening  12  with a rim  121 A raised in a back surface direction of the liquid crystal display  10  is formed on the opposing bezel  12 A by a burring process. A conductive layer is thereby exposed at a tip  1210  of the rim  121 A even when the opposing bezel  12 A is formed by layering a plating layer on a front and rear surface of the conductive layer. 
     Moreover, a conductive member  30  is disposed between the raised part  17 B of the heat radiating plate  17  and the opposing bezel  12 A, making contact with both. 
     The conductive member  30  is configured of a gasket having conductivity and elasticity. The conductive member  30  therefore is fitted to the raised part  17 B of the heat radiating plate  17  and the rim  121 A of the opening  121  of the opposing bezel  12 A. Moreover, the conductive member  30  electrically connects the heat radiating plate  17  and the opposing bezel  12 A because the conductive layer is exposed at the tip of the rim  121 A. 
     It thereby becomes possible to provide the liquid crystal display device  10  that exhibits the same or similar effects as one or more embodiments of the first example described above. 
     A switch configuration and the display device relating to the present invention are described above based on one or more embodiments, but the present invention is not limited to such embodiments. The present invention may include forms obtained by applying various modifications envisioned by those skilled in the art to the embodiments, and other forms obtained by combining the components of the embodiments. 
     The present invention is applicable to a device such as, for example, a liquid crystal display device, where electrostatic and/or discharge countermeasures are desired. Although the disclosure has been described with respect to only a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that various other embodiments may be devised without departing from the scope of the present invention. Accordingly, the scope of the present invention should be limited only by the attached claims 
     EXPLANATION OF REFERENCE NUMERALS 
     
         
           10  Liquid crystal display device 
           12 A to  12 D Bezel 
           13  Liquid crystal panel 
           17  Heat radiating plate 
           17 A Cut and raised portion 
           17 B Raised part 
           18  Rear frame 
           30  Conductive member 
           40  LED bar 
           120 ,  121  Opening