Abstract:
The present invention relates to a lid and a package structure having the same. The package structure comprises a first substrate, a first chip, a lid and a second package. The first chip is disposed on and electrically connected to the top surface of the first substrate. The lid is disposed on the top surface of the first substrate and comprises a body, a plurality of through holes and a cavity. The through holes penetrate the body and have a conductive material therein. The cavity accommodates the first chip. The second package is on the lid and is electrically connected to the first substrate through the conductive material in the through holes. As a result, the amount of the signal path between the second package and the first substrate is increased, and the manufacturing cost of the package structure is low.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to a stacked semiconductor package structure, particularly to a stacked semiconductor package structure having a lid.  
         [0003]     2. Description of the Related Art  
         [0004]      FIG. 1  shows a cross-sectional view of a first type of a conventional stacked package structure. The conventional stacked package structure  1  comprises a first package  10 , a second package  20 , a plurality of first solder balls  15  and a plurality of second solder balls  25 .  
         [0005]     The first package  10  comprises a first substrate  11 , a first chip  12 , a first molding compound  13  and a plurality of first wires  14 . The first substrate  11  has a top surface  111  and a bottom surface  112 , wherein the top surface  111  has a plurality of pads  113 , and the bottom surface  112  has the first solder balls  15 . The first chip  12  is adhered to the top surface  111  of the first substrate  11 , and is electrically connected to the top surface  111  of the first substrate  11  by utilizing the first wires  14 . The first molding compound  13  encapsulates the first chip  12 , the first wires  14  and part of the top surface  111  of the first substrate  11 .  
         [0006]     The second package  20  comprises a second substrate  21 , a second chip  22 , a second molding compound  23  and a plurality of second wires  24 . The second substrate  21  has a top surface  211  and a bottom surface  212 , wherein the bottom surface  212  has the second solder balls  25 . The second chip  22  is adhered to the top surface  211  of the second substrate  21 , and is electrically connected to the top surface  211  of the second substrate  21  by utilizing the second wires  24 . The second molding compound  23  encapsulates the second chip  22 , the second wires  24  and part of the top surface  211  of the second substrate  21 .  
         [0007]     In the conventional stacked package structure  1 , the second package  20  is stacked above the first package  10 , and the second solder balls  25  are connected to the pads  113  so that the second substrate  21  can be electrically connected to the first substrate  11 . That is, the signal path between the first package  10  and the second package  20  is the second solder balls  25 . However, because the second solder balls  25  must be higher than the first molding compound  13  and are in spherical appearance, their volume are always relative large. Thus, the amount of the second solder balls  25  is limited. As a result, the amount of the signal path between the first package  10  and the second package  20  is reduced.  
         [0008]      FIG. 2  shows a cross-sectional view of a second type of a conventional stacked package structure. In order to solve the above-mentioned shortcoming, another type of conventional stacked package structure  2  is provided, as shown in  FIG. 2 . The difference between the package structure  1  of  FIG. 1  and the package structure  2  is an interposer  28  added in the package structure  2 . The interposer  28  has a top surface  281  and a bottom surface  282 , wherein the top surface  281  has a plurality of upper pads  283 , and the bottom surface  282  has a plurality of lower pads  284 . Additionally, the second solder balls  25  in the package structure  1  are replaced by a plurality of third solder balls  26  and fourth solder balls  27 , wherein the third solder balls  26  are used for connecting the bottom surface  212  of the second substrate  21  and the upper pads  283 , and the fourth solder balls  27  are used for connecting the top surface  111  of the first substrate  11  and the lower pads  284 .  
         [0009]     In the package structure  2 , the signal path between the first package  10  and the second package  20  is the third solder balls  26 , the interposer  28  and the fourth solder balls  27 . Although the volumes of the third solder balls  26  and the fourth solder balls  27  are reduced, the difficulty of aligning the interposer  28  during manufacture process will increase the manufacture cost of the package structure  2 .  
         [0010]     Consequently, there is an existing need for a novel and improved stacked package structure to solve the above-mentioned problems.  
       SUMMARY OF THE INVENTION  
       [0011]     One objective of the present invention is to provide a package structure having a lid that is used as the signal path between the upper substrate and the lower substrate. As a result, the amount of the signal path between the two substrates is increased, and the manufacturing cost of the package structure is low.  
         [0012]     Another objective of the present invention is to provide a lid used in a package structure comprising a body, a plurality of through holes, a cavity, a plurality of first conductive elements and a plurality of second conductive elements. The body has a first surface and a second surface opposite to the first surface. The through holes penetrate the body, and have a plurality of first openings on the first surface and a plurality of second openings on the second surface. Each through hole has a conductive material therein. The cavity has an opening on the second surface. The first conductive elements are disposed on the first openings. The second conductive elements are disposed on the second openings.  
         [0013]     Another objective of the present invention is to provide a stacked package structure comprising a first substrate, a first chip, a lid and a second package. The first substrate has a top surface and a bottom surface. The first chip is disposed on the top surface of the first substrate and electrically connected to the top surface. The lid is disposed on the top surface of the first substrate, and comprises a body, a plurality of through holes and a cavity. The body has a first surface and a second surface opposite to the first surface. The through holes penetrate the body, and have a plurality of first openings on the first surface and a plurality of second openings on the second surface. Each through holes has a conductive material therein. The cavity has an opening on the second surface for accommodating the first chip. The second package is disposed above the lid, wherein the lid is electrically connected to the first substrate through the conductive material in the through holes. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0014]      FIG. 1  shows a cross-sectional view of a first type of a conventional stacked package structure;  
         [0015]      FIG. 2  shows a cross-sectional view of a second type of a conventional stacked package structure;  
         [0016]      FIG. 3   a  shows a cross sectional view of a first type of lid used in a package structure according to the present invention;  
         [0017]      FIG. 3   b  shows a bottom view of a first type of lid used in a package structure according to the present invention;  
         [0018]      FIG. 3   c  shows a top view of a first type of lid used in a package structure according to the present invention;  
         [0019]      FIG. 4   a  shows a cross sectional view of a second type of lid used in a package structure according to the present invention;  
         [0020]      FIG. 4   b  shows a bottom view of a second type of lid used in a package structure according to the present invention;  
         [0021]      FIG. 4   c  shows a top view of a second type of lid used in a package structure according to the present invention;  
         [0022]      FIG. 5  shows a stacked package structure according to a first embodiment of the present invention;  
         [0023]      FIG. 6  shows a stacked package structure according to a second embodiment of the present invention;  
         [0024]      FIG. 7  shows a stacked package structure according to a third embodiment of the present invention;  
         [0025]      FIG. 8  shows a stacked package structure according to a fourth embodiment of the present invention; and  
         [0026]      FIG. 9  shows a stacked package structure according to a fifth embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0027]      FIGS. 3   a  to  3   c  show a first type of lid used in a package structure according to the present invention, wherein  FIG. 3   a  is a cross sectional view,  FIG. 3   b  is a bottom view, and  FIG. 3   c  is a top view. The lid  30  comprises a body  31 , a plurality of through holes  32 , a cavity  33 , a plurality of first conductive elements  34 , a plurality of second conductive elements  35 , an inner metal line  37 , an outer metal line  38  and a shield metal layer  39 .  
         [0028]     The body  31  has a first surface  311  and a second surface  312  opposite to the first surface  311 . The through holes  32  penetrate the body  31 , and have a plurality of first openings  321  on the first surface  311  and a plurality of second openings  322  on the second surface  312 . Each through hole  32  has a conductive material  36  (for example, metal) therein. The cavity  33  is a recess hole or blind hole, which has an opening on the second surface  312 . The first conductive elements  34 , for example, pads or solder balls, are disposed on the first openings  321 . The second conductive elements  35 , for example, pads or solder balls, are disposed on the second openings  322 .  
         [0029]     The inner metal line  37  is on the second surface  312 , wherein the inner metal line  37  forms a close curve and is disposed between the second conductive elements  35  and the cavity  33 . The outer metal line  38  is on the second surface  312 , wherein the outer metal line  38  forms a close curve and is disposed outside the second conductive elements  35 . The inner metal line  37  and the outer metal line  38  can prevent moisture from entering the cavity  33  when the lid  30  is used in a harsh environment.  
         [0030]     The shield metal layer  39  is on the first surface  311 , and corresponds to the cavity  33 , which can protect the chip in the cavity  33  when the lid  30  is in use. Additionally, the shield metal layer  39  may be replaced by a metal trace layer so as to increase the wiring area on the first surface  311 .  
         [0031]      FIGS. 4   a  to  4   c  show a second type of lid used in a package structure according to the present invention, wherein  FIG. 4   a  is a cross sectional view,  FIG. 4   b  is a bottom view, and  FIG. 4   c  is a top view. The lid  40  comprises a body  41 , a plurality of through holes  42 , a cavity  43 , a plurality of first conductive elements  44 , a plurality of second conductive elements  45 , an inner metal line  47  and an outer metal line  48 .  
         [0032]     The lid  40  is substantially the same as the lid  30  in  FIGS. 3   a  to  3   c,  except that the cavity  33  in the lid  30  is a recess hole or blind hole that does not penetrate the body  31 , but the cavity  43  in the lid  40  is a through hole that penetrates the body  41 .  
         [0033]     The body  41  has a first surface  411  and a second surface  412  opposite to the first surface  411 . The through holes  42  penetrate the body  41 , and have a plurality of first openings  421  on the first surface  411  and a plurality of second openings  422  on the second surface  412 . Each through hole  42  has a conductive material  46  (for example, metal) therein. The first conductive elements  44 , for example, pads or solder balls, are disposed on the first openings  421 . The second conductive elements  45 , for example, pads or solder balls, are disposed on the second openings  422 .  
         [0034]      FIG. 5  shows a stacked package structure according to a first embodiment of the present invention. The stacked package structure  5  comprises the lid  30  as shown in  FIGS. 3   a  to  3   c.  The stacked package structure  5  comprises a first substrate  51 , a first chip  52 , the lid  30  and a second package  60 . The first substrate  51  has a top surface  511  and a bottom surface  512 . The first chip  52  is disposed on the top surface  511  of the first substrate  51  and is electrically connected to the top surface  511  by utilizing a plurality of wires  53 . It should be noted that the first chip  52  may be electrically connected to the top surface  511  by another method, such as flip chip bonding.  
         [0035]     The lid  30  is as shown in  FIGS. 3   a  to  3   c,  and comprises a body  31 , a plurality of through holes  32 , a cavity  33 , a plurality of first conductive elements  34 , a plurality of second conductive elements  35 , an inner metal line  37 , an outer metal line  38  and a shield metal layer  39 .  
         [0036]     The body  31  has a first surface  311  and a second surface  312  opposite to the first surface  311 . The through holes  32  penetrate the body  31 , and have a plurality of first openings  321  on the first surface  311  and a plurality of second openings  322  on the second surface  312 . Each through hole  32  contains a conductive material  36  (for example, metal) therein. The cavity  33  is a recess hole or blind hole, which has an opening on the second surface  312 . The cavity  33  is used for accommodating the first chip  52 . The first conductive elements  34 , for example, pads or solder balls, are disposed on the first openings  321 . The second conductive elements  35 , for example, pads or solder balls, are disposed on the second openings  322 .  
         [0037]     The inner metal line  37  is on the second surface  312 , wherein the inner metal line  37  forms a close curve and is disposed between the second conductive elements  35  and the cavity  33 . The outer metal line  38  is on the second surface  312 , wherein the outer metal line  38  forms a close curve and is disposed outside the second conductive elements  35 . The inner metal line  37  and the outer metal line  38  can prevent moisture from entering the cavity  33  when the lid  30  is used in a harsh environment.  
         [0038]     The shield metal layer  39  is on the first surface  311 , and corresponds to the cavity  33 , which can protect the first chip  52 .  
         [0039]     In the embodiment, there is no molding compound in the cavity  33 . That is, the lid  30  covers the first chip  52  directly. However, it should be noted that the first chip  52  may be encapsulated by a molding compound, and then covered by the lid  30 .  
         [0040]     In the embodiment, the lid  30  is adhered to the top surface  511  of the first substrate  51  by epoxy so that the second conductive elements  35  on the lid  30  are electrically connected to the electrical points (not shown) on the top surface  511  of the first substrate  51 . It should be noted that if there are pads or solder balls on the top surface  511  of the first substrate  51 , the pads or solder balls can be welded with the second conductive elements  35 . Therefore, no binder is needed.  
         [0041]     The second package  60  is disposed above the lid  30 , and comprises a second substrate  61 , a second chip  62 , a second molding compound  63  and a plurality of wires  64 . The second substrate  61  has a top surface  611  and a bottom surface  612 . The second chip  62  is disposed on the top surface  611  of the second substrate  61  and is electrically connected to the top surface  611  of the second substrate  61  by utilizing the wires  64 . It should be noted that the second chip  62  may be electrically connected to the second substrate  61  by another method, such as flip chip bonding. The second molding compound  63  is used for encapsulating the second chip  62  and part of the top surface  611  of the second substrate  61 .  
         [0042]     The bottom surface  612  of the second substrate  61  has a plurality of third conductive elements  65  (for example, solder balls) that are electrically connected to the first conductive elements  34 . Thus, in the stacked package structure  5 , the signal path between the second package  60  and the first substrate  51  is the third conductive elements  65 , the first conductive elements  34 , the conductive material  36  and the second conductive elements  35 . As a result, the volumes of the third conductive elements  65  are reduced hugely.  
         [0043]     It is to be understood that the second package  60  may be another type of any conventional package.  
         [0044]      FIG. 6  shows a stacked package structure according to a second embodiment of the present invention. The stacked package structure  6  of the embodiment is substantially the same as the stacked package structure  5  of the first embodiment, except that the shield metal layer  39  of the first embodiment is replaced by a metal trace layer  391  so as to increase the wiring area on the first surface  311 . Additionally, if necessary, a plurality of passive elements  66  are disposed on the metal trace layer  391 , and a shield metal layer  67  is disposed on the bottom surface  612  of the second substrate  61 , wherein the shield metal layer  67  corresponds to the passive elements  66 .  
         [0045]      FIG. 7  shows a stacked package structure according to a third embodiment of the present invention. The stacked package structure  7  of the embodiment is substantially the same as the stacked package structure  5  of the first embodiment, except that the stacked package structure  7  of the embodiment further has a third chip  71  and a fourth chip  72 .  
         [0046]      FIG. 8  shows a stacked package structure according to a fourth embodiment of the present invention. The stacked package structure  8  comprises the lid  40  as shown in  FIGS. 4   a  to  4   c.  The stacked package structure  8  comprises a first substrate  81 , a first chip  82 , the lid  40 , a first molding compound  83  and a second package  90 . The first substrate  81  has a top surface  811  and a bottom surface  812 . The first chip  82  is disposed on the top surface  811  of the first substrate  81  and is electrically connected to the top surface  811  by utilizing a plurality of wires  84 . It should be noted that the first chip  82  may be electrically connected to the first substrate  81  by another method, such as flip chip bonding.  
         [0047]     The lid  40  is as shown in  FIGS. 4   a  to  4   c,  and comprises a body  41 , a plurality of through holes  42 , a cavity  43 , a plurality of first conductive elements  44 , a plurality of second conductive elements  45 , an inner metal line  47  and an outer metal line  48 .  
         [0048]     The body  41  has a first surface  411  and a second surface  412  opposite to the first surface  411 . The cavity  43  penetrates the body  41 , which is used for accommodating the first chip  82 . The through holes  42  penetrate the body  41 , and have a plurality of first openings  421  on the first surface  411  and a plurality of second openings  422  on the second surface  412 . Each through hole  42  has a conductive material  46  (for example, metal) therein. The first conductive elements  44 , for example, pads or solder balls, are disposed on the first openings  421 . The second conductive elements  45 , for example, pads or solder balls, are disposed on the second openings  422 .  
         [0049]     In the embodiment, the lid  40  does not cover the first chip  82  completely. Therefore, the first chip  82  needs to be encapsulated by the first molding compound  83 , and then the lid  40  is attached to the first substrate  81 .  
         [0050]     In the embodiment, the lid  40  is adhered to the top surface  811  of the first substrate  81  by epoxy so that the second conductive elements  45  on the lid  40  are electrically connected to the electrical points (not shown) on the top surface  811  of the first substrate  81 . It should be noted that if there are pads or solder balls on the top surface  811  of the first substrate  81 , the pads or solder balls can be welded with the second conductive elements  45 . Therefore, no binder is needed.  
         [0051]     The second package  90  is disposed above the lid  0 , and comprises a second substrate  91 , a second chip  92 , a second molding compound  93  and a plurality of wires  94 . The second substrate  91  has a top surface  911  and a bottom surface  912 . The second chip  92  is disposed on the top surface  911  of the second substrate  91  and is electrically connected to the top surface  911  by utilizing the wires  94 . It should be noted that the second chip  92  may be electrically connected to the second substrate  91  by other method, such as flip chip bonding. The second molding compound  93  is used for encapsulating the second chip  92  and part of the top surface  911  of the second substrate  91 .  
         [0052]     The bottom surface  912  of the second substrate  91  has a plurality of third conductive elements  95  (for example, solder balls) that are electrically connected to the first conductive elements  44 . Thus, in the stacked package structure  8 , the signal path between the second package  90  and the first substrate  81  is the third conductive elements  95 , the first conductive elements  44 , the conductive material  46  and the second conductive elements  45 .  
         [0053]     It is to be understood that the second package  90  may be another type of any conventional package.  
         [0054]      FIG. 9  shows a stacked package structure according to a fifth embodiment of the present invention. The stacked package structure  9  of the embodiment is substantially the same as the stacked package structure  8  of the fourth embodiment, except that the stacked package structure  9  of the embodiment further has a third chip  96  and a fourth chip  97 .  
         [0055]     While several embodiments of the present invention have been illustrated and described, various modifications and improvements can be made by those skilled in the art. The embodiments of the present invention are therefore described in an illustrative but not restrictive sense. It is intended that the present invention may not be limited to the particular forms as illustrated, and that all modifications which maintain the spirit and scope of the present invention are within the scope as defined in the appended claims.