Patent Abstract:
A heat sink that absorbs heat generated from at least one semiconductor device and dissipates the heat absorbed includes: a first surface adapted to match and contact at least one semiconductor device; a second surface having a fin structure adapted to dissipate heat from the heat sink into the air, the second surface arranged opposite to the first surface; combining portions having combining apertures each adapted to receive a predetermined combining element to affix the at least one semiconductor device to the heat sink, the combining apertures being arranged through the first surface and the second surface; and a protrusion arranged at a location of the first surface matching a point on an upper portion of the at least one semiconductor device; wherein the protrusion stops the at least one semiconductor device from rotating upon the at least one semiconductor device being affixed to the first surface of the heat sink by the combining element.

Full 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 HEAT SINK AND DISPLAY PANEL COMPRISING THE SAME earlier filed in the Korean Intellectual Property Office on 8 Sep. 2003 and there duly assigned Ser. No. 2003-62544. 
     
    
     BACKGROUND OF THE INVENTION  
     Field of the Invention  
       [0002]     The present invention relates to a heat sink, and more particularly, to a heat sink for a heat source such as a high power semiconductor device in a display panel.  
       Description of the Related Art  
       [0003]     In a device driving circuit that uses a high power semiconductor device, a heat sink is provided for dissipating heat generated by the semiconductor device. A device, such as a PDP in which display cells are defined by electrodes arranged to cross each other and in which display cells of the display panel are addressed by switching timing of each electrode for emitting light, uses a number of high power switching devices. Since the high power switching devices generate a great amount of heat, if the heat is not dissipated efficiently, the heat not only degrades the switching devices but also diminishes the overall performance of the driving circuit. Therefore, the high power switching devices are mounted on a driving circuit board and combined with a heat sink. The heat sink can be manufactured by several methods including extrusion molding.  
         [0004]     A semiconductor device can be combined with a driving circuit board by soldering and with a heat sink by using screws. The heat sink can be combined with the semiconductor device by using screws and with the driving circuit board by a fixing member. In this manner, heat generated during operation of a driving circuit in a semiconductor device is dissipated into the air via the heat sink.  
         [0005]     Screw holes for combining semiconductor devices are formed in a heat sink. The heat sink can be manufactured by a variety of methods. For example, a heat sink can be manufactured by extrusion molding with a material having a high heat conductivity, such as aluminum. The heat sink generally has two surfaces, a surface to maximize a contact area with the semiconductor device to absorb heat generated by the heat source by conduction and another surface to maximize a contact area with air for dissipating absorbed heat into the air. The semiconductor devices can be combined with the heat sink via screws inserted through fabrication holes formed in the semiconductor devices and the screw holes formed in the heat sink. The heat sink is combined with a driving circuit board by a fixing member.  
         [0006]     The semiconductor devices are combined with the heat sink by using screws and with the driving circuit board by soldering. However, the semiconductor devices rotate in the screwing direction by the rotating force of the screws. In this case, the rotation of the semiconductor device can create significant problems in affixing the semiconductor devices to the driving circuit board. That is, the leads of the semiconductor devices are not in a correct position on the driving circuit board, and accordingly soldering must be performed by forced fitting, thereby damaging the leads of the semiconductor devices and the pattern on the printed circuit substrate.  
       SUMMARY OF THE INVENTION  
       [0007]     The present invention provides a heat sink having a structure that can correctly and easily combine with semiconductor devices.  
         [0008]     The present invention also provides a display panel comprising the heat sink according to the present invention.  
         [0009]     According to an exemplary embodiment of the present invention, a heat sink is provided comprising: a first surface adapted to match and contact at least one semiconductor device; a second surface having a fin structure adapted to dissipate heat from the heat sink into the air, the second surface arranged opposite to the first surface; combining portions having combining holes adapted to be applied to a predetermined combining element to affix the at least one semiconductor device to the heat sink, the combining holes being arranged through the first surface and the second surface; and a protrusion arranged at a location of the first surface matching a point on an upper portion of the at least one semiconductor device; wherein the protrusion stops the at least one semiconductor device from rotating upon the at least one semiconductor device being affixed to the first surface of the heat sink by the combining element.  
         [0010]     The protrusion can comprise a strip.  
         [0011]     The protrusion can comprise a strip having a width equal to 40% of a thickness of the at least one semiconductor device.  
         [0012]     The protrusion can comprise a bent structure accommodating a portion of the upper portion of the at least one semiconductor device.  
         [0013]     According to another exemplary embodiment of the present invention, a heat sink is provided comprising: a first surface arranged to match and contact at least one semiconductor device; a second surface having a fin structure and adapted to dissipate heat from the heat sink into the air, the second surface arranged opposite to the first surface; combining portions having combining apertures each adapted to receive a predetermined combining element to affix the at least one semiconductor device to the heat sink, the combining apertures being formed through the first surface and the second surface; and at least one protrusion arranged on the first surface adjacent to a periphery of the at least one semiconductor device; wherein the protrusion stops the at least one semiconductor device from rotating upon the at least one semiconductor device being affixed to the first surface of the heat sink by the combining element.  
         [0014]     The at least one protrusion can be arranged adjacent to a periphery of an upper portion of the at least one semiconductor device.  
         [0015]     The at least one protrusion can be arranged adjacent to a periphery of a side surface of the at least one semiconductor device.  
         [0016]     The at least one protrusion can be arranged at least one of adjacent to a periphery of an upper portion of the at least one semiconductor device or adjacent to a periphery of a side surface of the at least one semiconductor device.  
         [0017]     According to yet another exemplary embodiment of the present invention, a display panel including a heat sink is provided, the heat sink comprising: a first surface arranged to match and contact at least one semiconductor device; a second surface having a fin structure and adapted to dissipate heat from the heat sink into the air, the second surface arranged opposite to the first surface; combining portions having combining holes and adapted to be applied to a predetermined combining element to affix the at least one semiconductor device to the heat sink, the combining holes formed through the first surface and the second surface; and at least one protrusion arranged on the first surface adjacent to a periphery of an upper portion of the at least one semiconductor device; wherein the protrusion stops the at least one semiconductor device from rotating upon the at least one semiconductor device being affixed to the first surface of the heat sink by the combining element.  
         [0018]     The at least one protrusion can comprise a strip.  
         [0019]     The at least one protrusion can comprise a strip having a width equal to 40% of a thickness of the at least one semiconductor device.  
         [0020]     The at least one protrusion can comprise a bent structure accommodating a portion of the upper portion of the at least one semiconductor device.  
         [0021]     According to still another exemplary embodiment of the present invention, a display panel including a heat sink is provided, the heat sink comprising: a first surface adapted to match and contact at least one semiconductor device; a second surface having a fin structure adapted to dissipate heat from the heat sink into the air, the second surface arranged opposite to the first surface; combining portions having combining holes adapted to be applied to a predetermined combining element to affix the at least one semiconductor device to the heat sink, the combining holes being arranged through the first surface and the second surface; and a protrusion arranged at a location of the first surface matching a point on an upper portion of the at least one semiconductor device; wherein the protrusion stops the at least one semiconductor device from rotating upon the at least one semiconductor device being affixed to the first surface of the heat sink by the combining element.  
         [0022]     The at least one protrusion can be arranged adjacent to a periphery of an upper portion of the at least one semiconductor device.  
         [0023]     The at least one protrusion can be arranged adjacent to a periphery of a side surface of the at least one semiconductor device.  
         [0024]     The at least one protrusion can be arranged at least one of adjacent to a periphery of an upper portion of the at least one semiconductor device or adjacent to a periphery of a side surface of the at least one semiconductor device.  
         [0025]     According to yet another exemplary embodiment of the present invention, a heat sink is provided comprising: a main body adapted to absorb heat generated by at least one heat generating device and to externally dissipate the absorbed heat, the main body being affixed to the at least one heat generating device; at least one stop extending from the main body and adapted to prevent displacement of the at least one heat generating device from a predetermined location on the main body upon the at least one heat generating device and the main body being affixed together.  
         [0026]     The main body can comprise at least one aperture adapted to receive a respective at least one combining element passing therethrough, the at least one combining element adapted to affix the respective at least one heat generating device to the main body.  
         [0027]     The at least one combining element can comprise a screw.  
         [0028]     The at least one stop extending from the main body toward the at least one heat generating device can be arranged to contact at least one side of the respective at least one heat generating device. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0029]     A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same 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:  
         [0030]      FIG. 1  is a view of an example of a driving circuit board mounted on a PDP;  
         [0031]      FIG. 2  is a magnified view of a combined portion of a semiconductor device with a heat sink in the driving circuit board of  FIG. 1 ;  
         [0032]      FIG. 3A  is an exploded perspective view of a method of combining a at least one semiconductor device with the heat sink of  FIG. 2 ;  
         [0033]      FIG. 3B  is a perspective view of the heat sink of  FIG. 3A , combined with a at least one semiconductor device;  
         [0034]      FIG. 4A  is perspective view of a heat sink combined with a at least one semiconductor device according to a first embodiment of the present invention;  
         [0035]      FIG. 4B  is a right side view of the heat sink in  FIG. 4A ;  
         [0036]      FIG. 4C  is a perspective view of a modified version of the heat sink of  FIG. 4A  combined with a plurality of a at least one semiconductor device;  
         [0037]      FIG. 5A  is perspective view of a heat sink combined with a at least one semiconductor device according to a second embodiment of the present invention;  
         [0038]      FIG. 5B  is a right side view of the heat sink of  FIG. 5A ;  
         [0039]      FIG. 5C  is a perspective view of a modified version of the heat sink of  FIG. 5A  combined with a at least one semiconductor device;  
         [0040]      FIG.6A  is perspective view of a heat sink combined with a at least one semiconductor device, according to a third exemplary embodiment of the present invention;  
         [0041]      FIG. 6B  is a right side view of the heat sink of  FIG. 6A ;  
         [0042]      FIG. 6C  is a perspective view of a modified version of the heat sink of  FIG. 6A  combined with a at least one semiconductor device;  
         [0043]      FIG. 7A  is a plan view of a heat sink combined with a at least one semiconductor device according to a fourth embodiment of the present invention;  
         [0044]      FIGS. 7B through 7D  are plan views of a modified version of the heat sink of  FIG. 7A  combined with a at least one semiconductor device;  
         [0045]      FIG. 7E  is a plan view of a modified heat sink of  FIG. 7A  combined with a at least one semiconductor device;  
         [0046]      FIG. 8A  is a plan view of a heat sink combined with a at least one semiconductor device according to a fifth embodiment of the present invention;  
         [0047]      FIG. 8B  is a plan view of a modified version of the heat sink of  FIG. 8A  combined with a at least one semiconductor device;  
         [0048]      FIG. 9A  is a plan view of a heat sink combined with a at least one semiconductor device according to a sixth embodiment of the present invention;  
         [0049]      FIG. 9B  is a plan view of a modified version of the heat sink of  FIG. 9A  combined  8  with a at least one semiconductor device; and  
         [0050]      FIG. 10  is a block diagram of an example of a plasma display device that can employ a driving circuit having a heat sink combined with semiconductor devices according to the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0051]      FIG. 1  is a view of an example of a driving circuit board mounted on a Plasma Display Panel (PDP)  100 . In a device driving circuit that uses a high power semiconductor device, a heat sink is provided for dissipating heat generated by the semiconductor device. A device, such as a PDP in which display cells are defined by electrodes arranged to cross each other and in which display cells of the display panel are addressed by switching timing of each electrode for emitting light, uses a number of high power switching devices. Since the high power switching devices generate a great amount of heat, if the heat is not dissipated efficiently, the heat not only degrades the switching devices but also diminishes the overall performance of the driving circuit. Therefore, the high power switching devices are mounted on a driving circuit board, as shown in  FIG. 1 , combined with a heat sink. The heat sink can be manufactured by several methods including extrusion molding.  
         [0052]      FIG. 2  is a magnified drawing of a portion which includes a heat sink combined with a semiconductor device in the driving circuit board of  FIG. 1 . A semiconductor device  206  can be combined with a driving circuit board  200  by soldering and with a heat sink  202  by using screws. The heat sink  202  can be combined with the semiconductor device  206  by using screws and with the driving circuit board  200  by a fixing member  204 . In this manner, heat generated during operation of a driving circuit in a semiconductor device  206  is dissipated into the air via the heat sink  202 .  
         [0053]      FIG. 3A  is an exploded perspective view of a method of combining a semiconductor device with a heat sink of  FIG. 2 . Screw holes  304  for combining semiconductor devices  308  are formed in a heat sink  300 . The heat sink  300  can be manufactured by a variety of methods. However, the heat sink of  FIG. 2  is an example of a heat sink manufactured by extrusion molding with a material having a high heat conductivity, such as aluminum. The heat sink  300  generally has two surfaces, a surface to maximize a contact area with the semiconductor device  308  to absorb heat generated by the heat source by conduction and another surface to maximize a contact area with air for dissipating absorbed heat into the air. As illustrated in  FIG. 3A , the semiconductor devices  308  can be combined with the heat sink  300  via screws  314  inserted through fabrication holes  310  formed in the semiconductor devices  308  and the screw holes  304  formed in the heat sink  300 .  FIG. 3B  is a view of a combined state of the semiconductor devices  308  and the heat sink  300 . The heat sink  300  is combined with a driving circuit board  200  by a fixing member  306 .  
         [0054]     The semiconductor devices  308  are combined with the heat sink  300  by using the screws  314  and with the driving circuit board  200  by soldering. However, the semiconductor devices  308  rotate in the screwing direction by the rotating force of the screws  314 . In this case, the rotation of the semiconductor device  308  can create significant problems in affixing the semiconductor devices  308  to the driving circuit board  200 . That is, the leads of the semiconductor devices  308  are not in a correct position on the driving circuit board  200 , and accordingly soldering must be performed by forced fitting, thereby damaging the leads of the semiconductor devices  308  and the pattern on the printed circuit substrate.  
         [0055]     Hereinafter, a heat sink and a structure and operation of a display panel including the heat sink in accordance with embodiments of the present invention are described more fully with reference to the accompanying drawings.  
         [0056]     The heat sink according to the present invention absorbs heat generated by one or more of semiconductor devices, and dissipates the absorbed heat.  
         [0057]      FIG. 4A  is perspective view of a heat sink combined with a at least one semiconductor device, according to a first exemplary embodiment of the present invention, and  FIG. 4B  is a right side view of the heat sink of  FIG. 4A . The heat sink  400  includes a first surface  402 , a second surface  404 , combining holes  406 , and a protrusion  408 . The heat sink  400  is combined with a at least one semiconductor device  410  by screws (not shown).  
         [0058]     The first surface  402  is a surface that contacts the at least one semiconductor device  410 . Heat generated by the at least one semiconductor device  410  during operation of the driving circuit is transferred to the heat sink  400  by conduction. The second surface  404  on the opposite surface of the first surface  402  is a surface for dissipating heat into the air, and the second surface  404  is formed with a dissipating fin structure  404 a having a large air contact area.  
         [0059]     The combining holes  406 , are formed through the first surface  402  and the second surface  404  for affixing the semiconductor device to the heat sink  400 . Threads for screws can be formed in the combining holes  406 .  
         [0060]     The protrusion  408  is formed on a location of the heat sink  400  matching an upper portion of the at least one semiconductor device  410  placed on the first surface  402 . The protrusion  408  performs as a stop and does not allow the at least one semiconductor device  410  to rotate when the at least one semiconductor device  410  are affixed to the first surface  402  via the combining holes  406  and the attaching means (not shown), such as screws.  
         [0061]     As depicted in  FIG. 4A , the protrusion  408  can be formed as a protruding strip at a location matching the upper portion of the at least one semiconductor device  410 . A width of the protrusion  408  can be more than 40% of the thickness of the at least one semiconductor device  410  for effectively stopping the rotation of the at least one semiconductor device  410 . For example, if the thickness of the at least one semiconductor device  410  is 5 mm, the width of the protrusion is preferably more than 2 mm. Also, if the thickness of the at least one semiconductor device  410  is 3 mm, the width of the protrusion is preferably more than 1.2 mm.  
         [0062]      FIG. 4C  is a perspective view of a modified version of the heat sink of  FIG. 4A , combined with at least one semiconductor device, in which the protrusion  408  is formed on a top portion of the heat sink  400 . The embodiment of the heat sink of  FIG. 4C  becomes small if the at least one semiconductor device of the same size are combined.  
         [0063]     The location of the protrusion  408  in  FIGS. 4A and 4C  can vary according to the size of the heat sink  400  determined by the size of the at least one semiconductor device  410  and the amount of heat generated by the at least one semiconductor device  410 .  
         [0064]      FIG. 5A  is a perspective view of a heat sink combined with at least one semiconductor device, according to a second exemplary embodiment of the present invention, and  FIG. 5B  is a right side view of the heat sink of  FIG. 5A . The heat sink  500  includes a first surface  502 , a second surface  504 , combining holes  506 , and a protrusion  508 , and is combined with at least one semiconductor device  510  by an attaching means (not shown), such as screws. Except for the protrusion  508 , the basic shape of the heat sink  500  and the attachment to the at least one semiconductor device  510  are the same as in the case of the heat sink  400  of  FIG. 4A .  
         [0065]     The protrusion  508  is formed at a location of the heat sink  500  matching an upper portion of the at least one semiconductor device  510  placed on the first surface  502 . The protrusion  508  acts as a stop and does not allow the at least one semiconductor device  510  to rotate when the at least one semiconductor device  510  are fixed to the first surface  502  via the combining holes  506  and the attaching means (not shown), such as screws. Referring to  FIG. 5B , the protrusion  508  is formed such that an upper portion of the heat sink  500  extends as much as a thickness of the upper portion of the at least one semiconductor device  510  and then the extended portion is bent vertically downward. The vertically bent shape of the protrusion  508  enables the at least one semiconductor device  510  to tightly contact the first surface  502 . That is, according to the exemplary embodiment of  FIG. 5A , the protrusion  508  acts as a stop that does not allow the at least one semiconductor device  510  to rotate and as an assembling guide for the at least one semiconductor device  510 .  
         [0066]     The shape of the protrusion  508  can vary according to a corresponding shape of the upper portion of the at least one semiconductor device  510 .  
         [0067]      FIG. 5C  is a perspective view of a modified version of the heat sink of  FIG. 5A , combined with at least one semiconductor device, in which the protrusion  508  is formed by extending the upper portion of the heat sink  500 .  
         [0068]     In comparison with the heat sink of  FIG. 5A , the exemplary embodiment of  FIG. 5C  is an example of a heat sink that has a reduced heat-dissipating surface relative to the size of the at least one semiconductor device  510 .  
         [0069]      FIG. 6A  is a perspective view of a heat sink combined with at least one semiconductor device, according to a third exemplary embodiment of the present invention.  FIG. 6B  is a right side view of the heat sink of  FIG. 6A .  
         [0070]     The heat sink  600  includes a first surface  602 , a second surface  604 , combining holes  606 , and a protrusion  608 , and is combined with at least one semiconductor device  610  by an attachment means (not shown), such as screws. Except for the protrusion  608 , the basic shape of the heat sink  600  and the attachment to the at least one semiconductor device  610  are the same as in the case of the heat sink  500  of  FIG. 5A . The protrusion  608  is formed at a location of the heat sink  600  matching an upper portion of the at least one semiconductor device  610  placed on the first surface  602 . The protrusion  608  acts as a stop and does not allow the at least one semiconductor device  610  to rotate when the at least one semiconductor device  610  are affixed to the first surface  602  via the combining holes  606  and the attachment means (not shown), such as screws. Referring to  FIG. 6B , the protrusion  608  is formed such that an upper portion of the heat sink  600  extends as much as a thickness of the upper portion of the at least one semiconductor device  610  and the extended portion is bent vertically downward. Then, a protrusion  608   a  protruding inward is formed at the lower end portion of the bent portion. The protrusion  608   a  on the bent portion of the protrusion  608  enables the at least one semiconductor device  610  to tightly contact the first surface  602 .  
         [0071]      FIG. 6C  is a perspective view of a modified version of the heat sink of  FIG. 6A , combined with at least one semiconductor device, in which the protrusion  608  is formed by extending the upper portion of the heat sink  600 . In comparison with the heat sink of  FIG. 5A , the exemplary embodiment of  FIG. 5C  is an example of a heat sink that has a reduced heat-dissipating surface relative to the size of the at least one semiconductor device  510 .  
         [0072]      FIG. 7A  is a plan view of a heat sink combined with at least one semiconductor device according to a fourth exemplary embodiment of the present invention, in which the protrusion is formed by a single protrusion. The heat sink  700  comprises a first surface  702  that contacts the at least one semiconductor device, a second surface  704  having a dissipating fin structure  704   a  for dissipating the heat of the heat sink  700 , formed on the side opposite to the first surface  702 , combining holes  706  formed through the first surface  702  and the second surface  704  for combining the at least one semiconductor device to the heat sink  700  via an attaching means (not shown), such as screws, and protrusions  708   a  formed at a location matching a left surface of the at least one semiconductor device  710  on the first surface  702 . A circular shaped protrusion  708   a  is formed at a location of the heat sink  700  matching the left surface of the at least one semiconductor device  710  at a predetermined distance below a combining hole  706  to stop the at least one semiconductor device  710  from rotating in the screwing direction W 1 . The protrusion  708   a  can be located at a location of the heat sink  700  matching a left surface of the at least one semiconductor device  710  as in  FIG. 7A , or can be located on an upper portion or a right side of the at least one semiconductor device  710 .  
         [0073]      FIGS. 7B through 7D  are plan views of modified versions of the heat sink of  FIG. 7A , combined with at least one semiconductor device. As depicted in  FIG. 7B , if the protrusion  708   b  is formed at a location of the heat sink  700  matching a left surface of an upper portion of the at least one semiconductor device  710  at a predetermined distance from a combining hole  706 , the protrusion  708   b  can stop the at least one semiconductor device  710  from rotating in the screwing direction W 1 . As depicted in  FIG. 7C , if the protrusion  708   c  is formed at a location of the heat sink  700  matching a right surface of an upper portion of the at least one semiconductor device  710  at a predetermined distance from a combining hole  706 , the protrusion  708   c  can stop the at least one semiconductor device  710  from rotating in the unscrewing direction W 2 . As depicted in  FIG. 7D , if the protrusion  708   d  is formed at a location of the heat sink  700  matching a right surface of the at least one semiconductor device  710  at a predetermined distance below a combining hole  706 , the protrusion  708   d  can stop the at least one semiconductor device  710  from rotating in the unscrewing direction W 2 .  
         [0074]      FIG. 7E  is a plan view of a modified version of the heat sink of  FIG. 7A , combined with at least one semiconductor device, in which the protrusion  708   e  has a rectangular shape. The protrusion  708   e  can have the same functions as the previous protrusions but the shape thereof is different. With regard to the forming locations, the protrusion  708   a  can be located as in the case of the modified versions of the heat sinks of  FIGS. 7B through 7D .  
         [0075]     Except for the embodiments illustrated in  FIGS. 7A through 7E , the numbers and forms of the protrusions  708   a  through  708   e  can vary. That is, one or more protrusions with different shapes can be formed at a location of the heat sink  700  matching the outer surface of the at least one semiconductor device  710 .  
         [0076]     In the exemplary embodiments of  FIGS. 7A through 7E , the protrusions  708   a  through  708   e  can be formed together with embosses  720   a  through  720   e  for forming the combining holes  706  after forming the heat sink body  700  by extrusion molding. When forming a heat sink using an aluminum plate by pressing, the protrusions  708   a  through  708   e  can be formed by embossing during a shearing or bending process.  
         [0077]      FIG. 8A  is a plan view of a heat sink combined with at least one semiconductor device, according to a fifth exemplary embodiment of the present invention, in which two protrusions are provided. The protrusions  808   a  and  808   b  include a first protrusion  808   a  and a second protrusion  808   b . The first protrusion  808   a  is formed at a location of the heat sink  800  matching a point on the left surface of the at least one semiconductor device  810  at a predetermined distance below a combining hole  806 , and stops the semiconductor device  810  from rotating in the screwing direction W 1 . The second protrusion  808   b  is formed to match an upper side of the at least one semiconductor device  810  and guides a fabrication location of the at least one semiconductor device  810 . If the second protrusion  808   b  is formed at a location of the heat sink  800  matching a point on the right surface of the at least one semiconductor device  810  at a predetermined distance from the attachment hole  806 , the protrusion  808   b  can not only guide the assembly of the at least one semiconductor device  810  but also stop the at least one semiconductor device  810  from rotating in the unscrewing direction W 2 .  
         [0078]      FIG. 8B  is a plan view of a modified version of the heat sink of  FIG. 8A , combined with at least one semiconductor device, in which the protrusions  808   c  and  808   d  are formed in a rectangular shape. The protrusions  808   c  and  808   d  have the same locations and functions as the protrusions  808   a  and  808   b  of  FIG. 8A .  
         [0079]      FIG. 9A  is a plan view of a heat sink combined with at least one semiconductor device according to a sixth exemplary embodiment of the present invention. The protrusions  908   a  and  908   b  include a first protrusion  908   a  and a second protrusion  908   b . The first protrusion  908   a  is formed at a location on the heat sink  900  marching a point on a left surface of the at least one semiconductor device  910  at a predetermined distance below a combining hole  906 , and stops the at least one semiconductor device  910  from rotating in the screwing direction W 1 . The second protrusion  980   b  is formed at a location on the heat sink  900  matching a point on a right surface of the at least one semiconductor device  910  at a predetermined distance below a combining hole  906 , and stops the at least one semiconductor device  910  from rotating in the unscrewing direction W 2 .  
         [0080]      FIG. 9B  is a plan view of a modified version of the heat sink of  FIG. 9A  combined with at least one semiconductor device. The protrusions  908   c  and  908   d  include a first protrusion  908   c  and a second protrusion  908   d . The first protrusion  908   c  is formed at a location of the heat sink  900  matching a point on the left surface of the at least one semiconductor device  910  at a predetermined distance from a combining hole  906 , and the protrusion  908   c  stops the at least one semiconductor device  910  from rotating in the screwing direction W 1 . The second protrusion  908   d  is formed at a location of the heat sink  900  matching a point on the right surface of the at least one semiconductor device  910  at a predetermined distance from a combining hole  906 , and the protrusion  908   d  stops the at least one semiconductor device  910  from rotating in the unscrewing direction W 2 .  
         [0081]      FIG. 10  is a block diagram of an example of a plasma display device that can employ a driving circuit having a heat sink combined with at least one semiconductor device according to the present invention.  
         [0082]     Referring to  FIG. 10 , a driving device of a plasma display panel  1  comprises an image processing unit  2 , a logic control unit  3 , an address driving unit  5 , an X driving unit  6 , and a Y driving unit  4 . The image processing unit  2  transforms external analog image signals into digital signals, and then generates internal image signals such as  8  bit red R, green G, and blue B image signals, clock signals, and vertical and horizontal synchronizing signals. The logic control unit  3  generates driving control signals SA, SY, and SX according to the internal image signals received from the image processing unit  2 . The address driving unit  5  generates a display data signal by processing the address signal SA received from the logic control unit  3 , and applies the generated display data signal to the address electrodes A 1 , A 2 ,. .,and Am. The X driving unit  6  processes the X driving signal SX received from the logic control unit  3  and applies the X driving signal SX to the X electrodes. The Y driving unit  4  processes the Y driving signal SY received from the logic control unit  3  and applies the Y driving signal SY to the Y electrodes. At this time, the display cells in the panel  1  are selected by turning on the address electrodes and the Y electrodes at the same time. The selected display cells are discharged by alternately turning on the Y electrodes and the X electrodes. For this driving operation of the panel  1 , a number of high power switching semiconductor devices are used on the driving circuit. Also, for high efficiency of a driving operation of the panel, high power switching semiconductor devices are used in the energy recovery circuit included in the driving circuit board.  
         [0083]     A power supply circuit (not shown) is included in a driving circuit board of the display panel device. Recently, as a miniaturized and highly efficient of power supply circuit, a Switching Mode Power Supply (SMPS) is widely used. The SMPS uses many high power switching devices.  
         [0084]     For manufacturing a driving circuit board of a device of  FIG. 10 , the present invention provides a heat sink that can easily be combined with at least one heat generating semiconductor device.  
         [0085]     As described above, according to the heat sink and the display panel comprising the heat sink, semiconductor devices and the heat sink can be correctly and easily combined by an assembly guide provided on the heat sink. Therefore, a failure rate in manufacturing driving circuit boards can be reduced. Also, an additional heat dissipation effect can be achieved by adding the assembly guide since the assembly guide increases heat dissipation area.  
         [0086]     While this invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the present invention as recited in the appended claims. The exemplary embodiments should be considered in a descriptive sense only and not for purposes of limitation. Therefore, the scope of the present invention is defined not by the detailed description thereof but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

Technology Classification (CPC): 7