Abstract:
A Plasma Display Device having a chassis base which absorbs vibration and noise includes: a Plasma Display Panel (PDP) on which images are displayed; circuit board assemblies to control the PDP; and a chassis base having the PDP and the circuit board assemblies attached thereto, the chassis base including: a first plate facing the PDP, a second plate having the circuit board assemblies attached thereto; and at least one vibration absorption member interposed between the first and second plates to absorb vibration and noise.

Description:
CLAIM OF PRIORITY 
       [0001]    This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C.§119 from an application for PLASMA DISPLAY DEVICE earlier filed in the Korean Intellectual Property Office on 21 Nov. 2006 and there duly assigned Serial No. 10-2006-0115147. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a plasma display device. More particularly, the present invention relates to a plasma display device in which at least one vibration absorption member is included in a chassis base interposed between circuit board assemblies and a panel. 
         [0004]    2. Description of the Related Art 
         [0005]    A plasma display device displays images on a Plasma Display Panel (PDP) by using a plasma generated through a gas discharge. 
         [0006]    The plasma display device includes the PDP and a chassis base that is disposed on a rear surface of the PDP. Circuit board assemblies are disposed on the rear surface of the chassis base. The circuit board assemblies are connected to display electrodes (sustain and scan electrodes) or address electrodes in the PDP through Flexible Printed Circuits (FPCs) or connectors. 
         [0007]    The chassis base has functions of supporting the PDP, providing a space in which the circuit board assemblies are disposed, absorbing heat generated in the PDP, and grounding the circuit board assemblies. 
         [0008]    The circuit board assemblies are provided with various circuit elements so as to display images on the PDP. 
         [0009]    When the gas discharge is carried out, the PDP causes vibration due to an increase of electrostatic force and collides against barrier ribs due to the vibration to generate high frequency noise. Most of the high frequency noise is reduced by the chassis base. However, there is a problem that the rest of the noise is propagated as noise in a specific band. 
       SUMMARY OF THE INVENTION 
       [0010]    According to an aspect of the present invention, a plasma display device is provided including: a Plasma Display Panel (PDP); circuit board assemblies to control the PDP; and a chassis base having the PDP and the circuit board assemblies attached thereto, the chassis base including: a first plate facing the PDP; a second plate having the circuit board assemblies attached thereto; and at least one vibration absorption member interposed between the first plate and the second plate. 
         [0011]    The at least one vibration absorption member preferably includes a material selected from a group consisting of: resins, rubber, plastic, sponges, Styrofoam, and glass fibers. 
         [0012]    The plasma display device preferably further includes a plurality of vibration absorption members spaced apart from one another. 
         [0013]    The first plate preferably includes either stainless steel or aluminum. The second plate preferably includes either stainless steel or aluminum. 
         [0014]    The plasma display device preferably further includes connecting members to electrically connect the first plate to the second plate. 
         [0015]    A reinforcing material is preferably arranged on a surface of the second plate. 
         [0016]    The first plates, the second plates and the at least one vibration absorption member each preferably include apertures; and the at least one vibration absorption member is preferably attached to the first plates and the second plates by set screws passing through the apertures. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]    A more complete appreciation of the present invention and many of the attendant advantages thereof, will be readily apparent as the present invention becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein: 
           [0018]      FIG. 1  is a perspective view of a plasma display device according to a first embodiment of the present invention; 
           [0019]      FIG. 2  is a cross-sectional view taken along line II-II of  FIG. 1 ; 
           [0020]      FIG. 3  is a partially exploded perspective view of  FIG. 1 ; 
           [0021]      FIG. 4  is a detailed cross-sectional view of a portion of a chassis base; and 
           [0022]      FIG. 5  is a top plan view of an inside of a chassis base according to a second embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0023]    The present invention is described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. 
         [0024]      FIG. 1  is a perspective view of a plasma display device according to a first embodiment of the present invention. 
         [0025]    Referring to  FIG. 1 , the plasma display device according to the first embodiment of the present invention includes a PDP  11  which displays images by using a gas discharge, heat dissipating sheets  13  which are disposed on a rear surface of the PDP  11  so as to radiate heat generated by the PDP  11 , circuit board assemblies  115 ,  215 ,  315 ,  415 , and  515  which are electrically connected to the PDP  11  to drive the PDP  11 , and a chassis base  17  having a front surface including double-sided tapes  16  attached thereto to support the PDP  11  and a rear surface having the circuit board assemblies  115 ,  215 ,  315 ,  415 , and  515  attached thereto. 
         [0026]    The embodiment of the present invention relates to a connection structure between the PDP  11  and other components. Therefore, a detailed description of the internal structure of the PDP  11  has been omitted. 
         [0027]    The heat dissipating sheets  13  are disposed between the PDP  11  and the chassis base  17  to radiate heat generated during a gas discharge process away from the PDP  11 . Accordingly, the heat dissipating sheets  13  are made of a material having a high thermal conductivity, for example, an acrylic heat dissipating material, a graphite heat dissipating material, a metallic heat dissipating material, or a carbon nano-tube heat dissipating material. 
         [0028]    The circuit board assemblies  115 ,  215 ,  315 ,  415 , and  515  are attached to the chassis base  17  using set screws  19 . The circuit board assemblies  115 ,  215 ,  315 ,  415 , and  515  include an image process/control board  115 , an address buffer board  215 , a scan driving board  315 , a sustain driving board  415 , and a power source board  515 . 
         [0029]    The image process/control board  115  generates a control signal for driving address electrodes (not shown) and a control signal for driving display electrodes (not shown). In addition, the image process/control board  115  supplies the control signals to the address buffer board  215 , the scan driving board  315 , and the sustain driving board  415 . The power source board  515  is used to supply power for driving the plasma display device. 
         [0030]    The address buffer board  215 , the scan driving board  315 , and the sustain driving board  415  are connected to corresponding electrodes to drive the PDP  11 . 
         [0031]    The chassis base  17  may be formed by performing a press fabrication operation with respect to a thin metal plate. In addition, a reinforcing member  29  may be disposed on the rear surface of the chassis base  17  so as to prevent distortion or bending of the chassis base  17 . 
         [0032]      FIG. 2  is a cross-sectional view taken along line II-II of  FIG. 1 .  FIG. 3  is a partially exploded perspective view of  FIG. 1 . 
         [0033]    Referring to  FIGS. 2 and 3 , the chassis base  17  includes a plate member  17   a  and a vibration absorption member  17   b.    
         [0034]    The plate member  17   a  includes first and second plates  17   aa  and  17   ab . The first plate  17   aa  has a substantially rectangular shape. The second plate  17   ab , which has a rectangular shape, faces the first plate  17   aa  and is spaced apart from the first plate  17   aa . However, the shape of the first or second plate  17   aa  or  17   ab  is not limited to the rectangular shape. The first and second plates  17   aa  and  17   ab  may have various shapes. The first and second plates  17   aa  and  17   ab  may be made of metal, such as stainless steel or aluminum. 
         [0035]    The vibration absorption member  17   b  is interposed between the first and second plates  17   aa  and  17   ab  and closely attached to the first and second plates  17   aa  and  17   ab . Noise is prevented from occurring by absorbing vibration generated during the gas discharge process. 
         [0036]    As described above, when the vibration absorption member  17   b  is not included, the chassis base  17  contacts the surface of the display panel  11  due to the vibration transmitted from the PDP  11  to the chassis base  17 , and accordingly noise is generated. 
         [0037]    However, according to the embodiment of the present invention, the vibration absorption member  17   b , which is closely attached to the chassis base  17 , absorbs the vibration transmitted from the PDP  11  to the first plate  17   aa  of the chassis base  17 . Accordingly, the chassis base  17  is prevented from contacting the PDP  11 , and noise is prevented from occurring. 
         [0038]    On the other hand, the vibration absorption member  17   b  may be made of various materials, such as resins, plastic, sponges, Styrofoam, and glass fibers. 
         [0039]    Vibration may also be generated in the circuit board assemblies  215  and  515 . According to the embodiment of the present invention, although the generated vibration is transmitted to the chassis base  17 , the vibration is absorbed by the vibration absorption member  17   b , and therefore, the noise is prevented from occurring. 
         [0040]    Since the chassis base  17  has a function of absorbing electromagnetic waves (for example, ElectroMagnetic Interference (EMI), etc), the first and second plates  17   aa  and  17   ab  are electrically connected to each other by connection members (not shown). 
         [0041]      FIG. 4  is a detailed cross-sectional view of a portion of a chassis base  17 . 
         [0042]    Referring to  FIG. 4 , the first and second plates  17   aa  and  17   ab  and the vibration absorption member  17   b  are provided with holes  40  and connected to one another by the set screws  19  to be engaged with the holes  40 . 
         [0043]      FIG. 5  is a top plan view of an inside of a chassis base  17  according to a second embodiment of the present invention. 
         [0044]    Referring to  FIG. 5 , the vibration absorption member  17   b  is attached to the first plate  17   aa . There may be a plurality of the vibration absorption members  17   b  which are spaced apart from one another. Spaces may be formed between neighboring vibration absorption members  17   b . Air flowing through the spaces has a function of radiating heat by extracting heat from the chassis base  17 . 
         [0045]    While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the present invention is not limited to the embodiments discussed above, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.