Abstract:
A light emitting diode (LED) package includes a substrate, a first electrode and a second electrode mounted on opposite sides of the substrate, an LED chip mounted on a top surface of one of the electrodes and electrically connecting the first electrode and the second electrode by wire bonding, and a reflecting cup enclosing an outer periphery of the first electrode and the second electrode to expose top surfaces of the first electrode and the second electrode and bottom surfaces of the first electrode and the second electrode.

Description:
FIELD 
       [0001]    The present disclosure generally relates to solid state light emitting sources and, more particularly, to a light emitting diode (LED) package. 
       BACKGROUND 
       [0002]    LEDs have many advantages, such as high luminosity, low operational voltage, low power consumption, compatibility with integrated circuits, easy driving, long term reliability, and environmental friendliness which have promoted the wide use of LEDs as a light source. 
         [0003]    A typical LED package includes two electrodes, an LED chip mounted on one of the electrodes and electrically connecting the electrodes by wire bonding, and a reflecting surface enclosing the LED chip and mounted on top surfaces of the electrodes. Generally, the reflecting cup occupies most of the top surfaces of the electrodes. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0004]    Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
           [0005]      FIG. 1  is a bottom plan view of an LED package according to a first embodiment of the present disclosure. 
           [0006]      FIG. 2  is a cross-sectional view of the LED package of  FIG. 1 , taken along II-II line thereof 
           [0007]      FIG. 3  is a cross-sectional view of an LED package according to a second embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0008]    It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts have been exaggerated to better illustrate details and features of the present disclosure. 
         [0009]    The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like. 
         [0010]    Embodiments of an LED package in accordance with the present disclosure will now be described in detail below and with reference to the drawings. 
         [0011]    Referring to  FIGS. 1-2 , an LED package  100  in accordance with a first embodiment of the disclosure includes a substrate  10 , a first electrode  20 , and a second electrode  30  mounted on opposite sides of the substrate  10 , an LED chip  40  mounted on the first electrode  20 , a reflecting cup  50  enclosing the first electrode  20  and the second electrode  30 , and a package layer  60  filled in the reflecting cup  50 . 
         [0012]    The substrate  10  is an electrically insulating layer to electrically insulate the first electrode  20  and the second electrode  30 . The substrate has a T-shaped configuration. Two L-shaped recesses  11  are defined in opposite sides of the substrate  10 . The substrate  10  includes a top surface  12  and a bottom surface  13  parallel to the top surface  12 . 
         [0013]    The first electrode  20  includes a main body  25  and a first arm  21  extending from a top end of a right side of the main body  25 . A top surface  251  of the main body  25  and a top surface  211  of the first arm  21  are coplanar and cooperatively form a top surface of the first electrode  20 . A bottom surface  253  of the main body  25  is a bottom surface of the first electrode  20 . 
         [0014]    The second electrode  30  includes a main body  35  and a second arm  31  extending from a top end of a left side of the main body  35 . A top surface  351  of the main body  35  and a top surface  311  of the first arm  31  are coplanar and cooperatively form a top surface of the second electrode  30 . A bottom surface  353  of the main body  35  is a bottom surface of the second electrode  30 . 
         [0015]    The first arm  21  and the second arm  31  match the recesses  11  of the substrate  10  and are embedded in the recesses  11 , respectively. In this state, the first electrode  20  and the second electrode  30  are firmly mounted on the substrate  10 . The top surfaces of the first electrode  20  and the second electrode  30  are coplanar with the top surface  12  of the substrate  10 ; the bottom surfaces of the first electrode  20  and the second electrode  30  are coplanar with the bottom surface  13  of the substrate  10 . The LED chip  40  is mounted on a central portion of the top surface of the first electrode  20 . Wires  41  of the LED chip  40  electrically connect the first electrode  20  and the second electrode  30 . 
         [0016]    The reflecting cup  50  encloses an outer periphery of the first electrode  20  and the second electrode  30 . The bottom surfaces of the first electrode  20  and the second electrode  30  are exposed from the reflecting cup  50 . 
         [0017]    The reflecting cup  50  includes a bottom surface  51 , a side surface  52  and a contacting surface  56  extending upward from opposite sides of the bottom surface  51 , a top surface  53  bent from a top end of the side surface  52 , a reflecting surface  54  extending slantingly downward and from a free end of the top surface  53 , and a transition surface  55  extending from a free end of the reflecting surface  54  and connecting the second surface  56 . The bottom surface  51  is a flat surface and coplanar with the bottom surface of the first electrode  20 . The side surface  52  and the contacting surface  56  are parallel and perpendicular to the bottom surface  50 . A height of the side surface  52  is larger than that of the second side surface  53 . The top surface  53  is parallel to the bottom surface  51  and located at a top of the second side surface  52 . A width of the top surface  53  is less than that of the bottom surface  51 . The transition surface  55  is coplanar with the top surface of the first electrode  20  and located at an outer side of the first electrode  20  and the second electrode  30 . The contacting surface  56  firmly contacts the outer periphery of the first electrode  20  and the second electrode  30 . The reflecting surface  54 , the transition surface  55 , and the top surfaces of the first electrode  20 , the second electrode  30  and the substrate  10  cooperatively define a receiving space  57  therebetween to receive the packaging layer  60  therein. A depth of the receiving space  57  is larger than a height of the LED chip  40 . A bore diameter of the receiving space  57  decreases from top to bottom. 
         [0018]    The packaging layer  60  is transparent and made of a silicon or epoxy resin. A plurality of phosphorus powder can be doped in the packaging layer  60 . The packaging layer  60  fills in the receiving space  57  to envelope the LED chip  40  therein. 
         [0019]    In this embodiment, the reflecting cup  50  is mounted on the outer periphery of the first electrode  20  and the second electrode  30 , thus the entirety of the top surfaces of the first electrode  20  and the second electrode  30  are exposed from the reflecting cup  50  to engage the LED chip  40  and the wires  41 . The transition surface  54  located at an outer side of the LED chip  40  can reflect light emitted from the LED chip  40  out to enhance the light extraction efficiency of the LED package  100 . 
         [0020]    Referring to  FIG. 3 , an LED package  100   a  of a second embodiment is shown. The LED package  100   a  is similar to the LED package  100  of the first embodiment, and differences therebetween are that a first electrode  20   a  further includes a third arm  23  extending from a bottom end of a left side of a main body  25 , and a second electrode  30   a  further includes a fourth arm  33  extending from a bottom end of a right side of a main body  35 . The third arm  23  and the fourth arm  33  are embedded in a bottom end of the reflecting cup  50   a.  A bottom surface  233  of the third arm  23  is coplanar with a bottom surface  253  of the main body  25 . The bottom surfaces  233 ,  253  of the third arm  23  and the main body  25  are cooperatively form a bottom surface of the first electrode  20   a.  A bottom surface  333  of the fourth arm  33  is coplanar with the bottom surface  353  of the main body  35 . The bottom surfaces  333 ,  353  of the fourth are  33  and the main body  35  are cooperatively form a bottom surface of the second electrode  30   a.  The bottom surfaces of the first electrode  20   a  and the second electrode  30   a  are exposed from the reflecting cup  50   a,  and are coplanar. 
         [0021]    The embodiments shown and described above are only examples. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size, and arrangement of the parts within the principles of the present disclosure, up to and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.