Patent Publication Number: US-2022223762-A1

Title: Light emitting diode package and light emitting module including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of U.S. patent application Ser. No. 16/818,699, filed on Mar. 13, 2020, which is a continuation of PCT Application No. PCT/KR2018/013441 filed Nov. 7, 2018, which claims priority to and benefits of Korean Patent Application No. 10-2017-0175453 filed Dec. 19, 2017, and Korean Patent Application No. 10-2018-0133807 filed on Nov. 2, 2018. The entire contents of the aforementioned patent applications are incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     Embodiments of the present disclosure relate to a light emitting diode package and a light emitting module including the same. 
     BACKGROUND 
     In general, a light emitting diode package is used as a light source in various fields, such as a light source for backlight modules in a display device. In particular, the light emitting diode packages used as the light source for backlight modules can be classified into a top type light emitting diode package and a side-view type light emitting diode package. The side-view type light emitting diode package is used in an edge type backlight module to emit light to a side surface of a light guide plate. 
     SUMMARY 
     A light emitting diode package used in an edge type backlight module is generally required to emit light narrowly in a thickness direction of a light guide plate, that is, in a vertical direction thereof, while emitting light broadly in a lateral direction along an edge of the light guide plate. To this end, the side-view type light emitting diode package used in the edge type backlight module generally has an elongated shape in one direction. 
     On the other hand, a typical side-view type light emitting diode package has opposite polarity terminals at one side thereof. Accordingly, the opposite polarity terminals have a narrow area and are placed close to each other, thereby causing failure in contact between probes and the terminals upon testing. 
     In addition, the typical side-view type light emitting diode package has opposite polarity connecting portions disposed on a lower surface thereof and having a thin elongated shape. Accordingly, it is difficult for the light emitting diode package to secure a sufficient area for electrical connection to an external component, such as a circuit board of a backlight module. 
     Embodiments of the present disclosure provide a light emitting diode package that includes a single-polarity terminal formed on each of opposite side surfaces of a package substrate to secure a large area for each terminal, thereby preventing failure in contact between probes and the terminals. 
     Embodiments of the present disclosure provide a light emitting diode package that includes a single-polarity terminal formed on each of the opposite side surfaces of the package substrate to prevent short circuit between probes brought into contact with the terminals having opposite polarities. 
     Embodiments of the present disclosure provide a light emitting diode package that can prevent failure in contact between the terminals and the probes and short circuit between the probes, thereby enabling an accurate classification process. 
     Embodiments of the present disclosure provide a light emitting module that has reliability through accurate classification of light emitting diode packages. 
     In accordance with one embodiment of the present disclosure, a light emitting diode package includes a main body, a first lead frame, and a second lead frame. The main body includes a cavity formed at an upper portion thereof and has an elongated shape in one direction thereof. The first lead frame is coupled to a bottom of the main body and includes a first mount exposed to the cavity, a first terminal exposed to one side surface of the main body and a first connecting portion exposed to a lower surface of the main body. The second lead frame is spaced apart from the first lead frame in a lateral direction and is coupled to the bottom of the main body. Further, the second lead frame includes a second mount exposed to the cavity, a second terminal exposed to the other side surface of the main body and a second connecting portion exposed to the lower surface of the main body. Here, the first connecting portion includes a first element extending from the first terminal and a second element extending from a portion of the first element towards the second terminal in the one direction. In addition, the second connecting portion includes a third element extending from the second terminal and a fourth element extending from a portion of the third element towards the first terminal in the one direction. 
     In accordance with another embodiment of the present disclosure, a light emitting module includes a circuit board and the light emitting diode package mounted on the circuit board. Here, the light emitting diode package emits light towards one side surface of a light guide plate. 
     Embodiments of the present disclosure provide a light emitting diode package that includes a single-polarity terminal formed on each of opposite side surfaces of a package substrate to secure a large area for each terminal, thereby preventing failure in contact between probes and the terminals, and a light emitting module including the same. With this structure, the light emitting diode package can prevent short circuit between the probes brought into contact with the terminals having opposite polarities. In addition, a package substrate can prevent failure in contact between the terminals and the probes and short circuit between the probes, thereby improving reliability in classification of light emitting diode packages. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosed technology, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosed technology, and together with the description serve to describe the principles of the disclosed technology. 
         FIG. 1  to  FIG. 3  are views of a package substrate according to a first embodiment of the present disclosure.  FIG. 1  is a sectional view of the package substrate according to the first embodiment,  FIG. 2  is a bottom view of the package substrate according to the first embodiment, and  FIG. 3  is a top view of the package substrate according to the first embodiment. 
         FIG. 4  and  FIG. 5  are views of a package substrate according to a second embodiment of the present disclosure.  FIG. 4  is a sectional view of the package substrate according to the second embodiment and  FIG. 5  is a bottom view of the package substrate according to the second embodiment. 
         FIG. 6  to  FIG. 8  are views of a light emitting diode package according to one embodiment of the present disclosure.  FIG. 6  is a sectional view of the light emitting diode package according to this embodiment.  FIG. 7  is a bottom view of a light emitting diode chip mounted on the light emitting diode package and  FIG. 8  is a sectional view of the light emitting diode chip. 
         FIG. 9  and  FIG. 10  are views of a light emitting diode package according to another embodiment of the present disclosure.  FIG. 9  is a sectional view of the light emitting diode package according to this embodiment.  FIG. 10  is a top view of the light emitting diode package according to this embodiment. 
         FIG. 11  is a view of a light emitting module according to one embodiment of the present disclosure. 
         FIG. 12  to  FIG. 21  are views of a package substrate according to a third embodiment of the present disclosure. 
         FIG. 12  to  FIG. 14  are views of lead frames of the package substrate according to the third embodiment. 
         FIG. 15  is a plan view of the package substrate according to the third embodiment. 
         FIG. 16  is a bottom view of the package substrate according to the third embodiment. 
         FIG. 17  is a side view of the package substrate according to the second embodiment. 
         FIG. 18  to  FIG. 21  are sectional views of the package substrate according to the third embodiment. 
         FIG. 22  to  FIG. 24  are views of a light emitting diode package according to a further embodiment of the present disclosure.  FIG. 22  is a top view of the light emitting diode package according to a further embodiment.  FIG. 23  is a cross-sectional view (F 1 -F 2 ) of the light emitting diode package shown in  FIG. 22 .  FIG. 24  is a cross-sectional view (F 3 -F 4 ) of the light emitting diode package shown in  FIG. 22 . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are provided by way of example so as to fully convey the spirit of the present disclosure to those skilled in the art. Accordingly, the present disclosure is not limited to the embodiments disclosed herein and can also be implemented in different forms. In the drawings, widths, lengths, thicknesses, and the like of elements or components can be exaggerated for clarity and descriptive purposes. Throughout the specification, like reference numerals denote like elements having the same or similar functions. 
     According to one embodiment of the present disclosure, a light emitting diode package includes a main body, a first lead frame, and a second lead frame. The main body includes a cavity at an upper portion thereof and has an elongated shape in one direction thereof. The first lead frame is coupled to a bottom of the main body and includes a first mount exposed to the cavity, a first terminal exposed to one short side surface of the main body, and a first connecting portion exposed to a lower surface of the main body. The second lead frame is spaced apart from the first lead frame in a lateral direction and is coupled to the bottom of the main body. Further, the second lead frame includes a second mount exposed to the cavity, a second terminal exposed to the other short side surface of the main body, and a second connecting portion exposed to the lower surface of the main body. Here, the first connecting portion includes a first element extending from the first terminal and a second element extending from a portion of the first element towards the second terminal in the one direction. In addition, the second connecting portion includes a third element extending from the second terminal and a fourth element extending from a portion of the third element towards the first terminal in the one direction. 
     The second element and the fourth element are disposed parallel to each other. Further, at least one of the first connecting portion and the second connecting portion intersects with a central line perpendicular to the one direction. 
     In the light emitting diode package, a portion of the first element has a greater width than another portion thereof and a portion of the first element includes a portion extending from the first terminal. Further, another portion of the first element includes a portion extending from the second element. 
     In the light emitting diode package, a portion of the third element may have a greater width than another portion thereof and a portion of the third element may include a portion extending from the second terminal. Further, another portion of the third element may include a portion extending from the fourth element. 
     The cavity of the main body may have a width gradually increasing from a lower portion thereof to an upper portion thereof. The first lead frame may further include a first through-hole formed through the first lead frame. In addition, a portion of the main body may be placed in the first through-hole. An upper portion of the first through-hole may have a smaller width than a lower portion thereof. The second lead frame may further include a second through-hole formed through the second lead frame. In addition, a portion of the main body may be placed in the second through-hole. 
     An upper portion of the second through-hole may have a smaller width than a lower portion thereof. The first lead frame may further include a first groove formed on an upper surface thereof. The first groove may be filled with the main body. The second lead frame may further include a second groove formed on an upper surface thereof. The second groove may be filled with the main body. 
     A separation distance between the second element and the third element and a separation distance between the fourth element and the first element may be greater than a separation distance between the second element and the fourth element. In addition, the separation distance between the second element and the third element and the separation distance between the fourth element and the first element may be smaller than a separation distance between the second element and a side surface of the main body and a separation distance between the fourth element and the side surface of the main body. 
     The first mount and the second mount may have an elongated shape in one direction. 
     The light emitting diode package may further include a light emitting diode chip disposed in the cavity of the main body and electrically connected to the first mount and the second mount, and a sealing member filling the cavity to enclose the light emitting diode chip. 
     The light emitting diode chip may include a substrate having an elongated shape in one direction thereof, a light emitting structure, a first bump pad, and a second bump pad. The light emitting structure includes a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer sequentially stacked on a lower surface of the substrate. In addition, the first bump pad is electrically connected to the first conductivity type semiconductor layer. Further, the second bump pad is spaced apart from the first bump pad in a lateral direction and electrically connected to the second conductivity type semiconductor layer. Further, the first bump pad and the second bump pad extend in the one direction of the substrate. The first bump pad is disposed on the first mount and the second bump pad is disposed on the second mount. 
     According to another embodiment of the present disclosure, there is provided a light emitting module including a circuit board and the light emitting diode package mounted on the circuit board. Here, the light emitting diode package emits light towards one side of a light guide plate. 
     The circuit board may include a first region in which the light emitting diode package is disposed and a circuit pattern is formed, and a second region perpendicular to the first region. 
     In the light emitting module, the first connecting portion and the second connecting portion disposed on the lower surface of the light emitting diode package may be connected to the circuit pattern in the first region of the circuit board. Further, in the light emitting module, an upper surface of the light emitting diode package through which light is emitted may be disposed to face one side surface of the light guide plate. The light emitting diode package may be provided in plural. 
     Hereinafter, embodiments of the present disclosure will be described in detail. 
       FIG. 1  to  FIG. 3  are views of a package substrate according to a first embodiment of the present disclosure.  FIG. 1  is a sectional view of the package substrate according to the first embodiment,  FIG. 2  is a bottom view of the package substrate according to the first embodiment, and  FIG. 3  is a top view of the package substrate according to the first embodiment. 
     Referring to  FIG. 1  to  FIG. 3 , the package substrate  100  according to the first embodiment includes a first lead frame  110 , a second lead frame  120 , and a main body  130 . 
     The main body  130  supports the first lead frame  110  and the second lead frame  120  such that the first lead frame  110  and the second lead frame  120  are spaced apart from each other while surrounding the first lead frame  110  and the second lead frame  120 . For example, the main body  130  is formed of a thermosetting resin. 
     The main body  130  has an elongated shape in one direction thereof. Accordingly, the main body  130  includes side surfaces having long sides in one direction and side surfaces having short sides in the other direction. For example, a lower surface of the main body  130  may have a rectangular shape including two long sides facing each other and two relatively short sides facing each other. The main body  130  has a cavity  131  formed at an upper portion thereof to receive a light emitting diode chip (not shown) therein. Referring to  FIG. 1 , the cavity  131  has a taper structure having a width gradually increasing from a lower portion thereof to an upper portion thereof. However, it should be understood that the cavity  131  is not limited thereto and may have a structure wherein the upper portion of the cavity has the same width as the lower portion thereof. 
     The first lead frame  110  and the second lead frame  120  are coupled to the bottom of the main body  130 . In addition, the first lead frame  110  and the second lead frame  120  are disposed to be spaced apart from each other inside the main body  130  in a lateral direction and are insulated from each other by the main body  130 . 
     The first lead frame  110  includes a first mount  111 , a first groove  112 , a first terminal  113 , and a first connecting portion  114 . 
     The first mount  111  and the first groove  112  are formed on an upper surface of the first lead frame  110 . The first groove  112  is formed by half-etching the upper surface of the first lead frame  110  to form a concave structure on the upper surface thereof. The first groove  112  is filled with the main body  130 . A bonding area between the main body  130  and the first lead frame  110  is increased by the first groove  112 , thereby improving coupling strength between the first lead frame  110  and the main body  130 . In addition, the first groove  112  forms a long penetration path from a side surface of the main body  130  to the interior of the cavity  131 , thereby preventing foreign matter including moisture from entering the cavity  131 . 
     The first mount  111  is exposed inside the cavity  131 . The first mount  111  refers to a portion of the first lead frame  110  that allows a light emitting diode chip (not shown) to be mounted thereon and is electrically connected thereto. The first groove  112  is formed along the circumference of the first mount  111 . Accordingly, the first mount  111  protrudes above the first groove  112  filled with the main body  130  and thus is exposed to a bottom surface of the cavity  131 . Referring to  FIG. 3 , the first mount  111  may extend along one side surface of the main body  130 , which includes a long side thereof. 
     A side surface of the first lead frame  110  protrudes from one side surface of the main body  130 . The first terminal  113  includes the side surface of the first lead frame  110  exposed from the one side surface of the main body  130 . That is, the first terminal  113  corresponds to a side surface of a portion of the first lead frame  110  protruding from the one side surface of the main body  130 . Here, the one side surface of the main body  130  corresponds to one side surface of the main body  130 , which includes a short side thereof. 
     The first connecting portion  114  is exposed to the lower surface of the main body  130 . The first connecting portion  114  refers to a portion of the first lead frame  110  electrically connected to external components, such as a circuit board and the like. The first connecting portion  114  includes a first element  115  and a second element  116 . The first connecting portion  114  further includes a first expanded portion  117  which will be explained in detail later. 
     The first element  115  is connected to the first terminal  113 . According to this embodiment, since the first element  115  extends from the first terminal  113 , the first element  115  may have the same width as or a similar width to the first terminal  113 . Referring to  FIG. 1  to  FIG. 3 , since the first terminal  113  corresponds to a side surface of a portion of the first lead frame  110  protruding from the one side surface of the main body  130 , the first element  115  includes a lower surface of the portion of the first lead frame  110  protruding from the one side surface of the main body  130 . That is, the first element  115  has a large area extending to an external region of the main body  130  instead of being restrictively placed in regions of the main body  130 . 
     The second element  116  extends from a portion of the first element  115  and has an elongated structure. Here, the second element  116  extends from the first element  115  towards the second terminal  123  disposed at an opposite side to the first terminal  113 . Referring to  FIG. 3 , the second element  116  has a narrower width than the first element  115 . 
     Although the first connecting portion  114  is illustrated as being divided into the first element  115  and the second element  116  in description of the first embodiment, it should be noted that this description is provided for convenience and the first element  115  and the second element  116  are integrally connected to each other. 
     The second lead frame  120  includes a second mount  121 , a second groove  122 , a second terminal  123 , and a second connecting portion  124 , as shown in  FIGS. 1-3 . 
     The second mount  121  and the second groove  122  are formed on an upper surface of the second lead frame  120 . The second groove  122  is formed by half-etching the upper surface of the second lead frame  120  to form a concave structure on the upper surface thereof. The second groove  122  is filled with the main body  130 . A bonding area between the main body  130  and the second lead frame  120  may be increased by the second groove  122 , thereby improving coupling strength between the second lead frame  120  and the main body  130 . In addition, like the first groove  112 , the second groove  122  may form a long penetration path along which foreign matter including moisture enters the cavity  131 . 
     Referring to  FIG. 1 , the first groove  112  and the second groove  122  are disposed outside the cavity  131  of the main body  130 . However, it should be understood that the first groove  112  and the second groove  122  are not necessarily disposed outside the cavity  131 . The locations of the first groove  112  and the second groove  122  may be changed, as needed. 
     The second mount  121  is exposed inside the cavity  131 . The second mount  121  refers to a portion of the second lead frame  120  that allows a light emitting diode chip (not shown) to be mounted thereon and is electrically connected thereto. The second groove  122  is formed along the circumference of the second mount  121 . Accordingly, the second mount  121  protrudes above the second groove  122  filled with the main body  130  and thus is exposed from the bottom surface of the cavity  131 . Referring to  FIG. 3 , the second mount  121  may extend along one side surface of the main body  130 , which includes a long side thereof. With this structure, the second mount  121  is disposed to be spaced apart from the first mount  111  in the lateral direction. 
     Although the first mount  111  and the second mount  121  are illustrated as being spaced apart from each other in this embodiment as shown in  FIG. 3 , it should be understood that other implementations are possible. The structures of the first mount  111  and the second mount  121  may be changed depending upon the structure of a light emitting diode chip to be received in the cavity  131 . 
     A side surface of the second lead frame  120  protrudes from the other side surface of the main body  130 , which includes a short side thereof. The second terminal  123  includes the side surface of the second lead frame  120  protruding from the other side surface of the main body  130 . That is, the second terminal  123  corresponds to a side surface of a portion of the second lead frame  120  protruding from the other side surface of the main body  130 . 
     As shown in the drawings, the first terminal  113  protrudes from the one side surface of the main body  130  and is formed along the one side surface of the main body  130 . In addition, the second terminal  123  protrudes from the other side surface of the main body  130  and is formed along the other side surface of the main body  130 , as shown in  FIGS. 1-3 . As such, the first terminal  113  and the second terminal  123  protruding from the opposite sides of the main body  130  in the lateral direction can reflect light. 
     Some fraction of light emitted from a backlight unit to a light guide plate (not shown) may be reflected by the light guide plate towards a circuit board (not shown). Here, when the package substrate  100  according to this embodiment is applied to the backlight unit, the light traveling towards the circuit board is reflected by the first terminal  113  and the second terminal  123  protruding from the main body to enter the light guide plate (not shown). That is, the package substrate  100  according to this embodiment prevents reflected light from being absorbed into a space between packages and reflects the light to enter the light guide plate. Accordingly, the package substrate  100  may be applied to the backlight unit and prevent generation of dark spots on the light guide plate between the packages. Conventionally, since opposite-polarity terminals are disposed on one side surface of a package substrate, each of the terminals is inevitably formed to a narrow width. That is, a typical package substrate allows an insufficient area for each terminal. As a result, failure in contact between a probe and the terminals can occur in a process of classifying defective or high quality products of package substrates or light emitting diode packages, thereby causing errors in classification. 
     In the package substrate  100  according to this embodiment, the first terminal  113  and the second terminal  123  may be used as parts to which electric current is applied through probes upon testing of the package substrate  100  or the light emitting diode package. According to this embodiment, since only the first terminal  113  is disposed on one side surface of the main body  130 , the first terminal  113  can be formed in a large area. Likewise, since only the second terminal  123  is disposed on the other side surface of the main body  130 , the second terminal  123  can be formed in a large area. Since the package substrate  100  has only one terminal on one side surface of the main body  130 , the terminals of the package substrate  100  have a larger area than the terminals of the typical package substrate. 
     As such, the package substrate  100  according to this embodiment has a sufficient contact area between the terminals and the probes, thereby preventing failure in contact between the probes and the terminals. As a result, the package substrate according to this embodiment prevents failure in testing, for example, classification, of package substrates or light emitting diode packages including the same, thereby improving test reliability. 
     The second connecting portion  124  is exposed to the lower surface of the main body  130 . The second connecting portion  124  includes a third element  125  and a fourth element  126 , as shown in  FIG. 2 . The second connecting portion  124  further includes a second expanded portion  127  which will be explained in detail later. 
     The third element  125  is connected to the second terminal  123 . According to this embodiment, since the third element  125  extends from the second terminal  123 , the third element  125  may have the same width as the second terminal  123  or a similar width thereto. In addition, like the first element  115 , the third element  125  also has a large area extending to an external region of the main body  130  instead of being restrictively placed in regions of the main body  130 . 
     The fourth element  126  extends from a portion of the third element  125  and has an elongated structure. Here, the fourth element  126  extends from the third element  125  towards the first terminal  113 . Referring to  FIG. 3 , the fourth element  126  has a narrower width than the third element  125 . 
     Referring to  FIG. 2 , the second element  116  is disposed parallel to the fourth element  126 . In addition, at least one of the second element  116  and the fourth element  126  intersects with the central line perpendicular to one direction of the package substrate. 
     The typical package substrate includes connecting portions restrictively placed in an interior region of the main body and has an elongated narrow structure. On the contrary, the package substrate  100  according to this embodiment has a large width and includes the first element  115  and the third element  125 , which extend to an exterior region of the main body  130 , and the second element  116  and the fourth element  126 , which have an elongated structure. As such, the connecting portions of the package substrate  100  according to this embodiment have a larger area than those of the typical package substrate, thereby allowing reliable and stable electrical connection to external components. 
     In addition, the package substrate  100  according to this embodiment has only one terminal on one side surface of the main body  130 , thereby allowing easy electrical connection to external components through the side surface. Further, the package substrate  100  according to this embodiment may employ all of the first connecting portion  114  and the second connecting portion  124  disposed on the lower surface thereof and the first terminal  113  and the second terminal  123  disposed on the side surfaces thereof for electrical connection to external components. That is, the package substrate  100  can achieve electrical connection to external components through a larger area including the lower surface and the side surfaces thereof. 
     In the typical package substrate, the opposite polarity terminals are disposed on one side of the package substrate. Accordingly, the opposite polarity terminals are placed close to each other, thereby causing short circuit upon contact between probes and the opposite polarity terminals. On the contrary, the package substrate  100  according to this embodiment includes only one terminal on one side surface of the main body  130 , thereby preventing short circuit when the probes are brought into contact with the opposite polarity terminals. 
     Further, in the package substrate  100  according to this embodiment, at least one of the first connecting portion  114  and the second connecting portion  124  intersects with the central line perpendicular to one direction of the package substrate, thereby improving strength of the center of the package substrate  100 . 
     According to this embodiment, a portion of each of the first element  115  and the third element  125  has a greater width than another portion thereof. The portion of the first element  115  having a greater width includes a portion extending from the first terminal  113  and the portion of the third element  125  having a greater width includes a portion extending from the second terminal  123 . Further, a portion of the first element  115  having a small width includes a portion extending from the second element  116  and a portion of the third element  125  having a small width includes a portion extending from the fourth element  126 . 
     For convenience of description, portions of the first element  115  and the third element  125  expanded to have greater widths will be referred to as a first expanded portion  117  and a second expanded portion  127 , respectively. Referring to  FIG. 2 , other portions of the first connecting portion  114  and the second connecting portion  124  excluding the first expanded portion  117  and the second expanded portion  127  are placed in regions inside the first expanded portion  117  and the second expanded portion  127 . 
     A side surface of each of the first expanded portion  117  and the second expanded portion  127  corresponds to a portion of the first or second lead frame to be cut in a separation process by which plural lead frames connected to each other are individually divided. Without the first expanded portion  117  and the second expanded portion  127 , burrs can be generated from the first lead frame  110  and the second lead frame  120  when a cutting blade brushes against one side surface of each of the first lead frame  110  and the second lead frame  120  in the process of separating the lead frames. That is, the first expanded portion  117  and the second expanded portion  127  can prevent generation of burrs from the lead frames by preventing other portions of the first-1 and third elements excluding the first expanded portion  117  and the second expanded portion  127  from contacting the cutting blade in the process of separating the lead frames. 
     Further, the first expanded portion  117  and the second expanded portion  127  are connected to the first terminal  113  and the second terminal  123  to protrude from both side surfaces of the main body  130 , respectively. Accordingly, the first expanded portion  117  and the second expanded portion  127  also serve to reflect light together with the first terminal  113  and the second terminal  123 . As such, each of the first expanded portion  117  and the second expanded portion  127  may be formed to a width preventing generation of burrs in the process of separating the lead frames while reflecting as much light as possible. 
     Further, according to this embodiment, a separation distance between the second element  116  and the third element  125  and a separation distance between the fourth element  126  and the first element  115  are greater than a separation distance between the second element  116  and the fourth element  126 . 
     Since each of the first element  115  and the third element  125  has a large area, a large amount of a bonding agent is used upon bonding of the package substrate  100  to an external component. Here, when the amount of the bonding agent increases, the bonding agent can flow to an outer region of the first element  115  and the third element  125  upon compression of the package substrate  100  on the external component. Then, electrical conduction can occur between the first element  115  and the fourth element  126  or between the third element  125  and the second element  116 . Thus, in order to prevent this problem, the separation distance between the second element  116  and the third element  125  and the separation distance between the fourth element  126  and the first element  115  are set with reference to a separation distance between the second element  116  and the fourth element  126  not allowing electrical conduction by the bonding agent. 
     However, when the separation distance between the second element  116  and the third element  125  and the separation distance between the fourth element  126  and the first element  115  are too large, the size of the package substrate  100  may increase. Thus, in order to prevent undesirable increase in size or length of the package substrate  100 , the separation distance between the second element  116  and the third element  125  and the separation distance between the fourth element  126  and the first element  115  are configured to be smaller than a separation distance between the second element  116  and the side surface of the main body  130  and a separation distance between the fourth element  126  and the side surface of the main body  130 , respectively. 
       FIG. 4  and  FIG. 5  are views of a package substrate according to a second embodiment of the present invention.  FIG. 4  is a sectional view of the package substrate according to the second embodiment and  FIG. 5  is a bottom view of the package substrate according to the second embodiment. 
     In description of the package substrate  200  according to the second embodiment, descriptions of the same components as those of the package substrate  100  according to the first embodiment ( FIG. 1  to  FIG. 3 ) will be omitted and the following description will focus on different features of the package substrate  200  according to the second embodiment. 
     Referring to  FIG. 4  and  FIG. 5 , in the package substrate  200  according to the second embodiment, a first lead frame  210  is formed with a first through-hole  211  and a second lead frame  220  is formed with a second through-hole  221 . 
     The first through-hole  211  is disposed between the first groove  112  and the first terminal  113  of the first lead frame  210  and is formed to penetrate the first lead frame  210  from an upper surface of the first lead frame  210  to a lower surface thereof. In addition, the second through-hole  221  is disposed between the second groove  122  and the second terminal  123  of the second lead frame  220  and is formed to penetrate the second lead frame  220  from an upper surface of the second lead frame  220  to a lower surface thereof. 
     The first through-hole  211  formed through the first lead frame  210  and the second through-hole  221  formed through the second lead frame  220  are filled with the main body  130 . A bonding area between each of the first lead frame  210  and the second lead frame  220  and the main body  130  is increased by the first through-hole  211  or the second through-hole  221 , thereby improving coupling strength therebetween. 
     Each of the first through-hole  211  and the second through-hole  221  may have a structure wherein an upper portion has the same width as a lower portion, or alternatively, may have a stepped structure wherein the upper portion has a different width from the lower portion. 
     For example, the first through-hole  211  and the second through-hole  221  may have a structure wherein the upper portion has a smaller width than the lower portion, as shown in  FIG. 4 . In this structure, a portion of the main body  130  filling the lower portion of the first through-hole  211  is caught by the upper portion of the first through-hole  211  having a small width, whereby the main body  130  can be secured to the first lead frame  210 . Further, when the second through-hole  221  has a structure wherein the upper portion has a smaller width than the lower portion, the main body  130  can be secured to the second lead frame  220 . Accordingly, with such structures of the first through-hole  211  and the second through-hole  221 , the package substrate  200  enables firmer coupling between the main body  130  and each of the first lead frame  210  and the second lead frame  220 . 
       FIG. 6  to  FIG. 8  are views of a light emitting diode package according to one embodiment of the present disclosure. 
       FIG. 6  is a sectional view of the light emitting diode package  300  according to this embodiment as shown in  FIGS. 4-5 . In addition,  FIG. 7  is a bottom view of a light emitting diode chip mounted on the light emitting diode package and  FIG. 8  is a sectional view of the light emitting diode chip as shown in  FIG. 7 . 
     The light emitting diode package  300  according to this embodiment (shown in  FIG. 6 ) includes a package substrate  200 , a light emitting diode chip  400 , and a sealing member  310 . 
     The package substrate  200  shown in  FIG. 6  is the package substrate according to the second embodiment. However, it should be understood that the package substrate  200  is not limited to the package substrate according to the second embodiment and may include the package substrate according to the first embodiment. The light emitting diode chip  400  is disposed in the cavity  131  of the package substrate  200 . The light emitting diode chip  400  may have a structure wherein bump pads (not shown) having opposite polarities are formed on a lower surface thereof. The bump pads of the light emitting diode chip  400  may correspond to the first mount  111  and the second mount  121  of the package substrate  200 . 
     Referring to  FIG. 7  and  FIG. 8 , the light emitting diode chip  400  according to this embodiment includes a substrate  410 , a light emitting structure  420 , an ohmic reflective layer  430 , a first insulation layer  440 , a first pad metal layer  451 , a second pad metal layer  452 , a second insulation layer  460 , a first bump pad  470 , and a second bump pad  480 . With these components, the light emitting diode chip  400  has a structure wherein a lower periphery of the light emitting diode chip  400  has an elongated shape including long sides and short sides. Here, the long sides refer to sides of the lower periphery having a long length and the short sides refer to sides of the lower periphery having a shorter length than the long sides. 
     The substrate  410  may be selected from any structures allowing growth of a gallium nitride semiconductor layer thereon without limitation. For example, the substrate  410  may include a sapphire substrate, a gallium nitride substrate, a SiC substrate, and the like, and may be a patterned sapphire substrate. The substrate  410  has a rectangular shape having long sides and short sides. 
     The light emitting structure  420  is formed on a lower surface of the substrate  410 . The light emitting structure  420  includes a first conductivity type semiconductor layer  421 , an active layer  422 , and a second conductivity type semiconductor layer  423 . 
     The first conductivity type semiconductor layer  421  is formed on the lower surface of the substrate  410 . The first conductivity type semiconductor layer  421  may be a semiconductor layer grown on the substrate  410  and may be a gallium nitride semiconductor layer. The first conductivity type semiconductor layer  421  may be a gallium nitride semiconductor layer doped with n-type dopants, for example, Si. Here, although the first conductivity type semiconductor layer  421  is illustrated as being distinguished from the substrate  410 , a border between the first conductivity type semiconductor layer  421  and the substrate  410  can be unclear when the substrate is a gallium nitride substrate. 
     A mesa M is disposed on a lower surface of the first conductivity type semiconductor layer  421 . The mesa M may be placed in a region of the first conductivity type semiconductor layer  421 . Accordingly, edge regions of the first conductivity type semiconductor layer  421  may be exposed to the outside instead of being covered by the mesa M. In addition, the mesa M may include a portion of the first conductivity type semiconductor layer  421 . 
     The mesa M includes the second conductivity type semiconductor layer  423  and the active layer  422 . The active layer  422  is formed on the lower surface of the first conductivity type semiconductor layer  421  and the second conductivity type semiconductor layer  423  is formed on the lower surface of the active layer  422 . The active layer  422  may have a single quantum well structure or a multi-quantum well structure. The composition and thickness of well layers in the active layer  422  determine the wavelengths of light. In particular, the active layer may be formed to generate UV light, blue light or green light through adjustment of the composition of the well layers. 
     The second conductivity type semiconductor layer  423  may be a gallium nitride semiconductor layer doped with p-type dopants, for example, Mg. 
     Each of the first conductivity type semiconductor layer  421  and the second conductivity type semiconductor layer  423  may be composed of a single layer, without being limited thereto. Each of the first conductivity type semiconductor layer  421  and the second conductivity type semiconductor layer  423  may be composed of multiple layers and may include a super-lattice layer. 
     The first conductivity type semiconductor layer  421 , the active layer  422  and the second conductivity type semiconductor layer  423  may be grown on the substrate  410  in a chamber by a method well-known in the art, such as metal organic chemical vapor deposition (MOCVD) or molecular-beam epitaxy (MBE). 
     The mesa M has a slanted side surface to have an area gradually decreasing with increasing distance from the first conductivity type semiconductor layer  421 . With this structure, layers covering the side surface of the mesa M can be stably formed. 
     The mesa M may have an elongated rectangular shape along the shape of the substrate  410  and may include a groove formed in a longitudinal direction of the substrate  410  to expose the first conductivity type semiconductor layer  421 . As shown in  FIG. 7 , the groove may extend from a center of one short side of the mesa M adjacent to one short side of the substrate to pass the center of the mesa M along a long side of the substrate  410 . The groove has a shorter length than the length of a long side of the mesa M. Thus, the other side of the mesa M having a short length is separated from the groove. 
     The ohmic reflective layer  430  is formed on a lower surface of the second conductivity type semiconductor layer  423  to contact the second conductivity type semiconductor layer  423 . The ohmic reflective layer  430  may be disposed over substantially the entire region of the mesa in an upper region of the mesa M. Referring to  FIG. 8 , the ohmic reflective layer  430  is not disposed to cover the entirety of the upper region of the mesa M. For example, the ohmic reflective layer  430  may cover 80% or more of the upper region of the mesa M. Furthermore, the ohmic reflective layer  430  may cover 90% or more of the upper region of the mesa M. Although not shown in this drawing, the light emitting structure may further include an ohmic oxide layer (not shown) disposed in the upper region of the mesa M and covering the mesa M around the ohmic reflective layer  430 . With the structure where the ohmic oxide layer (not shown) is disposed around the ohmic reflective layer  430 , the light emitting structure has an enlarged ohmic contact region, thereby resulting in reduction in forward voltage of a light emitting diode. 
     The ohmic reflective layer  430  may include a reflective metal layer. Accordingly, the ohmic reflective layer  430  reflects light generated from the active layer  422  and reaching the ohmic reflective layer  430  towards the substrate  410 . For example, the ohmic reflective layer  430  may be composed of a single metal layer or may include an ohmic layer and a reflective layer. For example, the ohmic layer may be composed of a metal, such as Ni, and the reflective layer may be composed of a highly reflective metal, such as Ag or Al. In addition, the ohmic reflective layer  430  may include a barrier layer. The barrier layer may be composed of Ni, Ti, and Au. For example, the ohmic reflective layer may have a stack structure of Ni/Ag/Ni/Ti/Ni/Ti/Au/Ti. 
     According to another embodiment, the ohmic reflective layer  430  may include a transparent oxide layer forming ohmic contact with the second conductivity type semiconductor layer  423 , an insulation layer covering the transparent oxide layer and having an opening exposing the transparent oxide layer, and a metal reflective layer covering the insulation layer and connected to the transparent oxide layer through the opening of the insulation layer. With this structure, the ohmic reflective layer can provide an omnidirectional reflector. 
     The first insulation layer  440  covers the mesa M and the ohmic reflective layer  430 . In addition, the first insulation layer  440  may cover the side surface of the mesa M. Here, the first insulation layer  440  may cover a portion of the first conductivity type semiconductor layer  421  exposed through the side surface of the mesa M. With this structure, the first insulation layer  440  exposes the first conductivity type semiconductor layer  421  disposed along the periphery of the mesa M. 
     Further, the first insulation layer  440  is formed with at least one opening  441  that exposes the ohmic reflective layer  430 . The opening  441  of the first insulation layer  440  is disposed on the lower surface of the mesa M on which the second pad metal layer  452  will be formed later. The second pad metal layer  452  is electrically connected to the second conductivity type semiconductor layer  423  through the opening  441 . 
     The first insulation layer  440  may be composed of a single layer of SiO 2  or Si 3 N 4 . However, it should be understood that the first insulation layer  440  is not limited thereto. For example, the first insulation layer  440  may have a multilayer structure including a silicon nitride layer and a silicon oxide layer, and may include a distributed Bragg reflector in which silicon oxide layers and titanium oxide layers are alternately stacked one above another. 
     The first pad metal layer  451  is formed on a lower surface of the first insulation layer  440  and a lower surface of a portion of the first conductivity type semiconductor layer  421  exposed through the first insulation layer  440 . The first pad metal layer  451  is insulated from the mesa M and the ohmic reflective layer  430  by the first insulation layer  440 . With this structure, the first pad metal layer  451  contacts the first conductivity type semiconductor layer  421  and is electrically connected thereto. 
     The second pad metal layer  452  is formed on the lower surface of the first insulation layer  440  having the opening  441  therein and in the opening  441  to be spaced apart from the first pad metal layer  451 . With this structure, the second pad metal layer  452  is electrically connected to the ohmic reflective layer  430  through the opening  441 . 
     In some embodiments, the first pad metal layer  451  and the second pad metal layer  452  may be formed of the same material by the same process. In other embodiments, a different material and/or a different process may be available. Each of the first pad metal layer  451  and the second pad metal layer  452  may include an ohmic reflective layer, such as an Al layer. The ohmic reflective layer may be formed on a lower surface of a bonding layer such as a Ti, Cr or Ni layer. In addition, a protective layer having a single layer structure of Ni, Cr or Au, or a complex layer structure thereof may be formed on a lower surface of the ohmic reflective layer. For example, the first pad metal layer  451  and the second pad metal layer  452  may have a stack structure of Cr/Al/Ni/Ti/Ni/Ti/Au/Ti. 
     The second insulation layer  460  is formed to cover the first pad metal layer  451  and the second pad metal layer  452 . The second insulation layer  460  may cover the first conductivity type semiconductor layer  421  exposed along the periphery of the mesa M. Here, the second insulation layer  460  may expose the first conductivity type semiconductor layer  421  disposed at an edge of the substrate  410 . 
     The second insulation layer  460  includes a first opening  461  exposing the first pad metal layer  451  and a second opening  462  exposing the second pad metal layer  452 . The first opening  461  and the second opening  462  may be disposed in regions on the lower surface of the mesa M. 
     Referring to  FIG. 7 , the first opening  461  and the second opening  462  of the second insulation layer  460  are spaced apart from each other and are formed in an elongated shape along the long side of the substrate  410 . Further, at least one of the first opening  461  and the second opening  462  may be formed to intersect with a central line C. Here, the central line C refers to a line parallel to the short side of the lower surface of the light emitting diode chip  400  or the substrate  410  and passing the center of the lower surface. That is, the central line C is a line extending from the center between opposite short sides of the light emitting diode chip to a long side thereof. Referring to  FIG. 7 , both the first opening  461  and the second opening  462  are formed to intersect with the central line C. 
     The second insulation layer  460  may be formed of a single layer of SiO 2  or Si 3 N 4 , without being limited thereto. For example, the second insulation layer  460  may have a multilayer structure including a silicon nitride layer and a silicon oxide layer, and may include a distributed Bragg reflector in which silicon oxide layers and titanium oxide layers are alternately stacked one above another. 
     Referring again to  FIG. 7 , the first bump pad  470  and the second bump pad  480  are formed on the first pad metal layer  451  and the second pad metal layer  452 , respectively, and protrude downwards below the second insulation layer  460 . 
     The first bump pad  470  is formed on a lower surface of the first pad metal layer  451  exposed through the first opening  461  of the second insulation layer  460 . With this structure, the first bump pad  470  is electrically connected to the first conductivity type semiconductor layer  421  through the first pad metal layer  451 . 
     The second bump pad  480  is formed on a lower surface of the second pad metal layer  452  exposed through the second opening  462  of the second insulation layer  460 . With this structure, the second bump pad  480  is electrically connected to the second conductivity type semiconductor layer  423  through the second pad metal layer  452  and the ohmic reflective layer  430 . The second pad metal layer  452  may be omitted. Here, the second bump pad  480  may directly contact the ohmic reflective layer  430 . 
     Referring to  FIG. 8 , a lower surface of each of the first bump pad  470  and the second bump pad  480  may be formed to a greater width than an upper surface thereof so as to cover a portion of a lower surface of the second insulation layer  460 . As such, the lower surface of each of the first bump pad  470  and the second bump pad  480  covers the lower surface of the second insulation layer  460 , thereby providing a large bonding area for bonding to external components. Accordingly, it is possible to achieve reliable connection between the light emitting diode chip  400  and the external components. 
     According to this embodiment, the light emitting diode chip  400  includes the first bump pad  470  and the second bump pad  480  covering the lower surface of the second insulation layer  460 , as shown in  FIG. 7 . However, it should be understood that the structure of the light emitting diode chip  400  is not limited thereto. For example, the first bump pad  470  and the second bump pad  480  may be restrictively placed on the first pad metal layer  451  exposed through the first opening  461  and the second opening  462 . The first bump pad  470  and the second bump pad  480  are formed along the first opening  461  and the second opening  462  of the second insulation layer  460 . Accordingly, the first bump pad  470  is disposed in an elongated shape along one long side of the light emitting diode chip  400 . Further, the second bump pad  480  is disposed in an elongated shape along the other long side of the light emitting diode chip  400 . That is, the first bump pad  470  and the second bump pad  480  are spaced apart from each other in the lateral direction to be disposed in an elongated shape along both long sides of the light emitting diode chip  400 . Referring to  FIG. 7 , both the first bump pad  470  and the second bump pad  480  have a length to intersect with the central line C. 
     The first bump pad  470  and the second bump pad  480  are formed of an electrically conductive material. For example, the first bump pad  470  and the second bump pad  480  may be composed of a single metal layer including Au or TiN, or may be composed of multiple layers including an Au layer and a TiN layer. However, it should be understood that the first bump pad  470  and the second bump pad  480  are not limited thereto and may be formed of any electrically conductive material. 
     Conventionally, a light emitting diode chip having a rectangular periphery is formed with two bump pads at opposite sides with respect to the central line thereof. With this structure, the light emitting diode chip has a higher metal density at the opposite sides thereof than a central region thereof. Thus, the light emitting diode chip having an elongated shape has a problem of easy bending or breakage around the central line. 
     However, the light emitting diode chip  400  according to this embodiment includes the first bump pad  470  and the second bump pad  480  formed to intersect with the central line and thus does not suffer from such a problem. 
     Although both the first bump pad  470  and the second bump pad  480  according to this embodiment are formed to intersect with the central line C, the structures of the first bump pad  470  and the second bump pad  480  may be changed depending upon the structure of the first mount  111  and the second mount  121  of the package substrate  200 . 
     As shown in  FIG. 6 , the light emitting diode chip  400  may be secured to the package substrate  200  by an electrically conductive bonding agent interposed between the bump pads of the light emitting diode chip  400  and each of the first mount  111  and the second mount  121  of the package substrate  200 . For example, the light emitting diode chip  400  may be mounted on the package substrate  200  such that the first bump pad  470  and the second bump pad  480  face the first mount  111  and the second mount  121  of the package substrate  200 , respectively, followed by bonding the light emitting diode chip  400  to the package substrate  200 . The sealing member  310  covers the light emitting diode chip  400  by filling the cavity  131  of the package substrate  200  therewith. The sealing member  310  seals the cavity  131  to prevent foreign matter including moisture and dust from entering the light emitting diode package  300 . The sealing member  310  may be formed of an epoxy resin or a silicone resin. Further, the sealing member  310  may further include phosphors or a diffusing agent capable of converting light emitted from the light emitting diode chip  400 , as needed. 
     Although the light emitting diode package  300  according to this embodiment has an elongated structure, the first lead frame  210  and the second lead frame  220  are formed to intersect with the central line C, thereby improving strength of the center of the light emitting diode package. Accordingly, despite the elongated structure, the light emitting diode package  300  is prevented from being bent or broken, thereby improving reliability of the light emitting diode package  300  or a product on which the light emitting diode package  300  is mounted. 
       FIG. 9  and  FIG. 10  are views of a light emitting diode package according to another embodiment of the present disclosure.  FIG. 9  is a sectional view of the light emitting diode package according to this embodiment.  FIG. 10  is a top view of the light emitting diode package according to this embodiment. 
     Referring to  FIG. 9  and  FIG. 10 , the light emitting diode package  500  according to this embodiment includes a package substrate  530 , a light emitting diode chip  400 , a Zener diode chip  520 , and a sealing member  310 . 
     The package substrate  530  is the package substrate  100  according to the first embodiment (see  FIG. 1  to  FIG. 3 ), which further includes a first Zener connecting portion  511  and a second Zener connecting portion  512 . Alternatively, the package substrate  530  may be the package substrate  200  according to the second embodiment (see  FIG. 4  and  FIG. 5 ), which further includes the first Zener connecting portion  511  and the second Zener connecting portion  512 . 
     The first Zener connecting portion  511  is formed on an upper surface of a first lead frame  540 . The first Zener connecting portion  511  is disposed between the first groove  112  of the first lead frame  540  and the cavity  131  of the main body  130 . 
     The second Zener connecting portion  512  is formed on an upper surface of a second lead frame  550 . The second Zener connecting portion  512  is disposed between one end of the second mount  121  of the second lead frame  550  in a direction of the first terminal  113  and the cavity  131  of the main body  130 . Accordingly, the first Zener connecting portion  511  is spaced apart from the second Zener connecting portion  512  in the lateral direction. 
     The Zener diode chip  520  is mounted on the first Zener connecting portion  511  and the second Zener connecting portion  512  to be electrically connected thereto. The Zener diode chip  520  is connected in parallel to the light emitting diode chip  400 . 
     The light emitting diode package  500  according to this embodiment includes not only the light emitting diode chip  400  but also the Zener diode chip  520  therein such that the light emitting diode chip  400  and the Zener diode chip  520  are electrically connected to each other through the same lead frame. Accordingly, the light emitting diode package  500  according to this embodiment can prevent short circuit due to an external environment as compared with a structure where the light emitting diode chip  400  and the Zener diode chip  520  are individually packaged and connected to each other through a separate circuit board. In addition, the light emitting diode package  500  according to this embodiment allows less consumption in area than the structure where the light emitting diode chip  400  and the Zener diode chip  520  are individually packaged, thereby increasing in intensity of light and enabling further miniaturization of light emitting diode packages. 
       FIG. 11  is a view of a light emitting module according to one embodiment of the present disclosure. Referring to  FIG. 11 , the light emitting module  10  includes a circuit board  11  and a light emitting diode package  300 . The light emitting diode package  300  is the light emitting diode package described with reference to  FIG. 6 . For details of the light emitting diode package  300 ,  FIG. 6  and the descriptions associated with  FIG. 6  are provided above. 
     The light emitting diode package  300  is mounted on the circuit board  11 . In addition, the circuit board  11  is formed with interconnection lines electrically connected to the light emitting diode package  300  mounted thereon. For example, the circuit board  11  may be a printed circuit board, or a flexible printed circuit board including interconnection lines on an insulation layer. Alternatively, the circuit board  11  may be a metal board including interconnection lines on an insulation layer formed on a metal layer. Alternatively, the circuit board  11  may be a ceramic substrate or a synthetic resin board, such as a resin, glass, or epoxy substrate. Alternatively, the circuit board  11  may include at least one selected from the group consisting of an epoxy molding compound (EMC), polyimide (PI), ceramic, graphene, glass synthetic fibers, and combinations thereof. 
     The circuit board  11  is divided into a first region  12  and a second region  13 . The light emitting diode package  300  is disposed in the first region  12 . In the first region  12 , the light emitting diode package  300  is electrically connected to the interconnection line of the circuit board  11 . The first region  12  is disposed to face a side surface of a light guide plate  20  that receives light emitted from the light emitting diode package  300 . 
     The second region  13  is perpendicular to the first region  12 . That is, the second region  13  protrudes from the first region  12  towards the light guide plate  20 . The circuit board  11  is provided with a plurality of light emitting diode packages  300  in the first region  12 . The light emitting diode packages  300  are arranged linearly in the longitudinal direction of the first region  12 . 
     Each of the light emitting diode packages  300  includes a package substrate (not shown) and a light emitting diode chip (not shown) mounted on the package substrate. According to this embodiment, the light emitting diode package  300  has an elongated shape in one direction of the package substrate The light emitting diode package  300  is provided at opposite side surfaces thereof with terminals such that only one terminal having one polarity is disposed on one side surface thereof. In addition, the light emitting diode package  300  is provided on a lower surface thereof with connecting portions connected to the terminals and having an elongated section. That is, each of the connecting portions of the light emitting diode package  300  has a large area composed of one portion connected to the terminal and another portion extending from the portion. Accordingly, the light emitting diode package  300  is connected to the circuit board  11  through a large area, thereby enabling reliable electrical connection to the circuit board  11 . 
     The light emitting diode package  300  according to this embodiment has the connecting portions exposed to the lower surface thereof and emits light through an upper surface thereof. That is, the lower surface of the light emitting diode package  300  acts as a bonding surface and the upper surface thereof acts as a light emission surface. The circuit board  11  has a structure where the first region  12  is perpendicular to the second region  13 . With this structure of the circuit board  11 , when the light emitting diode package  300  is bonded to the first region  12  of the circuit board  11 , the light emission surface of the light emitting diode package  300  may be disposed to face one side surface of the light guide plate  20  corresponding to a light incidence surface thereof. Thus, light emitted from the light emission surface of the light emitting diode package  300  enters the light guide plate  20  through the light incidence surface of the light guide plate  20 , as shown in  FIG. 11 . 
     With the light emitting diode package  300  and the circuit board  11  having the structures described above, the light emitting module  10  according to this embodiment does not require bending of the lead frame to be placed on the side surface of the light emitting diode package for implementation of a side view. 
     In addition, as shown in the drawings, the first terminal  113  and the second terminal  123  are formed to protrude from the opposite side surfaces of the light emitting diode package  300 , respectively. The first terminal  113  protrudes from one side surface of the light emitting diode package  300 . In addition, the second terminal  123  protrudes from the other side surface of the light emitting diode package  300 . 
     Some fraction of light emitted from the plurality of light emitting diode packages  300  is reflected by the light guide plate  20  towards the circuit board  11 . If light reflected by the light guide plate  20  is absorbed by the circuit board  11  through a gap between the light emitting diode packages, dark spots can be generated on the light exit surface of the light guide plate. However, in the light emitting module  10  according to this embodiment, light traveling towards the circuit board  11  is reflected by the first terminal  113  and the second terminal  123  protruding from the opposite side surfaces of the light emitting diode package  300  to enter the light guide plate  20 . Accordingly, the light emitting module  10  allows light traveling toward the gap between the light emitting diode packages  300  to be reflected so as not to be absorbed by the circuit board  11 , thereby preventing generation of dark spots on the light guide plate due to the gap between the light emitting diode packages  300 . 
       FIG. 12  to  FIG. 21  are views of a package substrate according to a third embodiment of the present disclosure. In addition,  FIG. 22  to  FIG. 24  are views of a light emitting diode package according to a further embodiment of the present disclosure. Here, the light emitting diode package shown in  FIG. 22  to  FIG. 24  is a light emitting diode package to which the package substrate according to the third embodiment is applied. 
       FIG. 12  to  FIG. 14  are views of lead frames of the package substrate according to the third embodiment.  FIG. 15  is a plan view of the package substrate according to the third embodiment.  FIG. 16  is a bottom view of the package substrate according to the third embodiment.  FIG. 17  is a side view of the package substrate according to the second embodiment. In addition,  FIG. 18  to  FIG. 21  are sectional views of the package substrate according to the third embodiment. 
     In describing the package substrate  600  according to the third embodiment, the same components as those of the package substrates according to the above embodiments will be briefly described or omitted and the following description will focus on different features thereof. 
     The package substrate  600  according to the third embodiment includes a first lead frame  610 , a second lead frame  620 , and a main body  630 . 
     A lower portion of the main body  630  surrounds the first lead frame  610  and the second lead frame  620  and an upper portion of the main body  630  is formed with a cavity  631  ( FIG. 15 ). The first lead frame  610  and the second lead frame  620  are spaced apart from each other in the main body  630  in the lateral direction and are insulated from each other by the main body  630 . As shown in  FIG. 12  to  FIG. 14 , the first lead frame  610  includes a first mount  611 , a first groove  612 , a first Zener connecting portion  661 , a first terminal  613 , a first connecting portion  614 , and first protrusions  619 . In addition, the second lead frame  620  includes a second mount  621 , a second groove  622 , a second Zener connecting portion  662 , a second terminal  623 , a second connecting portion  624 , and a second protrusion  629 . 
       FIG. 12  shows details of upper and lower portions of the first lead frame  610  and the second lead frame  620 . In  FIG. 12 , a solid line indicates external appearances of the upper portions of the first lead frame  610  and the second lead frame  620 . That is, the solid line of FIG.  12  corresponds to a plan view of the first lead frame  610  and the second lead frame  620  shown in  FIG. 13 . In addition, a dotted line of  FIG. 12  indicates lower external appearances of the lower potions of the first lead frame  610  and the second lead frame  620  blocked by the upper portions thereof. That is, in  FIG. 12 , the dotted line and the solid line connected to the dotted line correspond to a rear view of the first lead frame  610  and the second lead frame  620  shown in  FIG. 14 . 
     Referring to  FIG. 13 , shadow-patterned portions of the first lead frame  610  and the second lead frame  620  correspond to half-etched portions of upper surfaces thereof. The half-etched portion of the upper surface of the first lead frame  610  corresponds to the first groove  612 . As shown in  FIG. 13 , the first groove  612  is formed around the first mount  611 . In addition, the half-etched portion of the upper surface of the second lead frame  620  corresponds to the second groove  622 . As shown in  FIG. 14 , the second groove  622  is formed around the second mount  621 . Referring to  FIG. 14 , the shadow-patterned portions of the first lead frame  610  and the second lead frame  620  correspond to half-etched portions of lower surfaces thereof. 
     The lower portion of the first lead frame  610  is subjected to half-etching along outer peripheries of a first element  615 , a second element  616  and a fifth element  618  in a minor axis direction thereof excluding a portion facing a fourth element  626  of the second lead frame  620  and the first terminal  613 . By half-etching, lower portions of the plural first protrusions  619  are partially exposed. 
     In the lower portion of the first lead frame  610 , a gap between the second element  616  and the fifth element  618  which are spaced apart from each other are partially subjected to half-etching. 
     A half-etched portion at one side of the gap between the second element  616  and the fifth element  618  corresponds to a portion of a lower portion of the first mount  611 . In a cross-sectional view of this portion, the first lead frame  610  has a structure where the lower portion of the first mount  611  is subjected to half-etching to form a third groove  650 , as shown in  FIG. 18 . The third groove  650  is filled with the main body  630 , thereby improving bonding strength between the first lead frame  610  and the main body  630 . 
     A half-etched portion at the other side of the gap between the second element  616  and the fifth element  618  corresponds to a portion of a lower portion of one of the first protrusions  619 . Here, one side refers to a side facing the second lead frame  620  and the other side refers to a side opposite to the one side. 
     Accordingly, although the second element  616  and the fifth element  618  are spaced apart from each other, upper portions thereof are connected to each other by the first mount  611  and one first protrusion  619 . With this structure, a separation space  640  in which the second element  616  is spaced apart from the fifth element  618  is formed between the first mount  611  and the first protrusion  619 . That is, the first lead frame  610  has a structure wherein a through-hole is formed between the first mount  610  and the first protrusion  619 . Referring to  FIG. 20 , the separation space  640  is filled with the main body  630 , thereby improving bonding strength between each of the first lead frame  610  and the second lead frame  620  and the main body  630 . 
     First through-holes  641  as shown in  FIG. 29  have a structure where a lower portion thereof is subjected to half-etching to have a larger diameter than an upper portion thereof. 
     First burr preventing portions  645  are formed by half-etching corners of the lower surface of the first lead frame  610 , which are placed in the minor axis direction thereof. The first terminal  613  is disposed between two first burr preventing portions  645 . 
     Half-etched portions of the lower surface of the second lead frame  620  correspond to second protrusions  629 , second through-holes  642 , and second burr preventing portions  646 . 
     The lower portion of the second lead frame  620  is subjected to half-etching along outer peripheries of a third element  625  and a fourth element  626  in a minor axis direction thereof excluding a portion facing the first lead frame  610  and the second terminal  623 . By half-etching, lower portions of the plural second protrusions  629  are partially exposed. 
     The second through-holes  642  have a structure wherein a lower portion thereof is subjected to half-etching to have a larger diameter than an upper portion thereof. 
     The second burr preventing portions  646  are formed by half-etching corners of the lower surface of the second lead frame  620 , which are placed in the minor axis direction thereof. The second terminal  623  is disposed between two second burr preventing portions  646 . 
     The first burr preventing portions  645  and the second burr preventing portions  646  serve to prevent generation of burrs at corners of a cut surface upon dicing in a process of separating a plurality of package substrates or light emitting diode packages connected to one another. 
     Each of the first lead frame  610  and the second lead frame  620  may have the same thickness d 6  (see  FIG. 18 ) as the width of the light emitting diode chip mounted on the package substrate  600 . Here, the thickness of each of the first lead frame  610  and the second lead frame  620  refers to a distance from an upper surface thereof to a lower surface thereof having no etched portions. In addition, the width of the light emitting diode chip refers to a distance between opposite sides of the light emitting diode in a major axis direction thereof. For example, the first lead frame  610  and the second lead frame  620  may have a thickness d 6  of 250 μm and the light emitting diode chip mounted on the package substrate  600  may have a width of 250 μm. 
     For example, the package substrate  600  may have a total thickness of 700 μm and a total width of 7,000 μm. Here, the total thickness of the package substrate  600  refers to a distance from the lower surface of the main body  630 , to which the first connecting portion  614  of the first lead frame  610  and the second connecting portion  624  of the second lead frame  620  are exposed, to the upper surface of the main body  630  on which the cavity  631  is formed. Further, the total width of the package substrate  600  refers to a distance from one side surface of the main body  630  on which the first terminal  613  of the first lead frame  610  is exposed to the other side surface of the main body  630 , to which the second terminal  623  of the second lead frame  620  is exposed. The total thickness and the total width of the light emitting diode package  700  (see  FIG. 22  to  FIG. 24 ), in which the light emitting diode chip is mounted on the package substrate  600  and the cavity  631  is filled with the sealing member, are also the same as those of the package substrate  600 . 
     The first mount  611 , the first groove  612  and the first Zener connecting portion  661  ( FIG. 15 ) are formed on the upper surface of the first lead frame  610 . In addition, the second mount  621 , the second groove  622  and the second Zener connecting portion  662  are formed on the upper surface of the second lead frame  620 , as shown in  FIG. 15 . 
     Referring to  FIG. 15 , the first mount  611 , the second mount  621 , the first Zener connecting portion  661  and the second Zener connecting portion  662  are exposed through the cavity  631  of the package substrate  600 . 
     The first groove  612  is formed along the periphery of the first mount  611  and the second groove  622  is formed along the periphery of the second mount  621 . That is, the first groove  612  surrounds the first mount  611  and the second groove  622  surrounds the second mount  621 . In other words, the first groove  612  or the second groove  622  is formed on the bottom of the cavity  631  at an exposed lower portion of the main body  630  around the first mount  611  and the second mount  621 . With this structure, the first groove  612  divides the first mount  611  from the first Zener connecting portion  661 , and the second groove  622  divides the second mount  621  from the second Zener connecting portion  662 . 
     As shown in  FIG. 22  to  FIG. 24 , the light emitting diode chip  710  is mounted on the first mount  611  and the second mount  621  and is electrically connected to the first mount  611  and the second mount  621 . In addition, the first Zener connecting portion  661  and the second Zener connecting portion  662  are electrically connected to the Zener diode chip  720 . The bump pads  711  of the light emitting diode chip  710  are disposed on the first mount  611  and the second mount  621 , respectively. 
     The sizes of the first mount  611  and the second mount  621  and a distance between the first mount  611  and the second mount  621  correspond to the sizes of the bump pads  711  of the light emitting diode chip  710  and a distance between the bump pads  711 . That is, the size of each of the first mount  611  and the second mount  621  and the distance d 1  therebetween may be substantially the same as those of the bump pads of the light emitting diode chip  710 . In this case, as shown in  FIG. 22 , when the light emitting diode chip  710  is mounted on the package substrate  600 , the light emitting diode chip  710  covers the first mount  611  and the second mount  621  to prevent the first mount  611  and the second mount  621  from being exposed to the outside. However, it should be understood that the sizes of the first mount  611  and the second mount  621  are not limited to the sizes of the bump pads of the light emitting diode chip  710 . Alternatively, the first mount  611  and the second mount  621  may be formed in a larger area than the bump pads of the light emitting diode chip  710  to allow deposition of a large amount of an electrically conductive bonding agent  730  in order to improve bonding strength between the light emitting diode chip  710  and the package substrate  600 . In this case, when the light emitting diode chip  710  is mounted on the package substrate  600 , the first mount  611  and the second mount  621  can be exposed to the outside. 
     For example, the distance d 1  between the first mount  611  and the second mount  621  may be 250 μm. 
     A distance d 2  between the first mount  611  and one inner wall of the main body  630  and a distance d 3  between the second mount  621  and the other inner wall of the main body  630  are set in consideration of the size and luminous efficacy of the light emitting diode package. Here, the inner wall of the main body  630  refers to an inner wall defining the cavity  631  and faces the other inner wall thereof in the minor axis direction of the main body  630 . 
     If d 2  and d 3  are too large, the size of the light emitting diode package increases. If d 2  and d 3  are too small, the distance between the light emitting diode chip  710  and the inner wall of the main body  630  excessively decreases. In this case, light emitted through the side surface of the light emitting diode chip  710  is reflected by the inner wall of the main body  630  to enter the light emitting diode chip  710 . As a result, luminous efficacy of the light emitting diode package deteriorates. On the package substrate  600  according to this embodiment, the light emitting diode chip  710  having the bump pads  711  biased in one direction is mounted. Accordingly, in order to ensure the reliable connection between the light emitting diode chip  710  and the package substrate  600 , the first mount  611  and the second mount  621  are also formed to be biased in one direction. For example, d 2  is 130 μm and d 3  is 120 μm. However, it should be understood that d 2  and d 3  are not limited to different values and may be identical to, or different from each other depending upon the locations of the bump pads  711 . For example, both d 2  and d 3  may be 130 μm, or 120 μm. 
     The first terminal  613  of the first lead frame  610  protrudes from one side surface of the main body  630  in the major axis direction thereof. That is, the first terminal  613  protrudes from one side surface of the main body  630 , which has a short length. In addition, the second terminal  623  of the second lead frame  620  protrudes from the other side surface of the main body  630  in the major axis direction thereof. For example, each of the first lead frame  610  and the second lead frame  620  may have a protrusion distance d 4  of 200 μm. 
     An upper width of the first terminal  613  and an upper width of the second terminal  623  are the same as a width of the other side surface of the main body  630 . Here, the width refers to a distance between opposite sides thereof in the minor axis direction of the package substrate  600 . 
     The first lead frame  610  is formed with a plurality of first protrusions  619  on one side surface thereof, which is placed in the minor axis direction of the main body  630  and has a long length. Here, the one side surface of the first lead frame  610  having the plurality of protrusions  619  thereon is opposite to the other side surface thereof, which faces the second lead frame  620  and has a long length. 
     The plural first protrusions  619  are linearly arranged along the one side surface of the first lead frame  610  and are spaced apart from one another. Each of the first protrusions  619  is formed by half-etching a portion of the lower surface of the first lead frame  610  connected to the one side surface of the first lead frame  610 , which has a long length. Accordingly, each of the first protrusions  619  protrudes from the upper surface of the first lead frame  610  in the lateral direction, as shown in  FIG. 20  and  FIG. 21 . Further, a lower portion of each of the first protrusions  619  having a concave shape formed by half-etching is filled with the main body  630 . 
     The first protrusions  619  of the first lead frame  610  are exposed to one side surface of the main body  630 , which has a long length, as shown in  FIG. 17 . 
     The second lead frame  620  is formed with a plurality of second protrusions  629  on one side surface thereof, which is placed in the minor axis direction of the main body  630  and has a long length. Here, the one side surface of the second lead frame  620  having the plurality of second protrusions  629  thereon is opposite to the other side surface thereof, which faces the first lead frame  610  and has a long length. 
     The plural second protrusions  629  are linearly arranged along the one side surface of the second lead frame  620  and are spaced apart from one another. Each of the second protrusions  629  is formed by half-etching a portion of the lower surface of the second lead frame  620  connected to the one side surface of the second lead frame  620 , which has a long length. Accordingly, each of the second protrusions  629  protrudes from the upper surface of the second lead frame  620  in the lateral direction, as shown in  FIG. 20  and  FIG. 21 . Further, a lower portion of each of the second protrusions  629  having a concave shape formed by half-etching is filled with the main body  630 . 
     The second protrusions  629  of the second lead frame  620  are exposed to the other side surface of the main body  630 , which has a long length. 
     According to this embodiment, a bonding area between each of the first lead frame  610  and the second lead frame  620  and the main body  630  is increased by the first protrusions  619  and the second protrusions  629 . 
     The main body  630  has half-etched upper corners on one of the opposite side surfaces thereof in the major axis direction. This structure is an electrode mark  637  indicating an electrode direction of the package substrate  600 . The electrode mark  637  may be disposed at an upper portion of the lead frame connected to one of a cathode and an anode of an external power source of the package substrate  600 . 
     Referring to  FIG. 16 , the first connecting portion  614  of the first lead frame  610  and the second connecting portion  624  of the second lead frame  620  are exposed to the lower surface of the main body  630 . The first connecting portion  614  is divided into a first element  615 , a second element  616  and a fifth element  618 , and the second connecting portion  624  is divided into a third element  625  and a fourth element  626 . 
     The first element  615  extends from the first terminal  613  and is connected to the second element  616 . That is, the first element  615  has a large area extending to an external region of the main body  630  instead of being restrictively placed in a region of the main body  630 . 
     The second element  616  extends from a portion of the first element  615  and has a smaller width than the first element  615 . The second element  616  has an elongated shape extending towards the other side surface of the main body  630 . 
     The fifth element  618  is spaced apart from the second element  616  and is disposed between the second element  616  and the third element  625 . The fifth element  618  is spaced apart from the second element  616 . However, in the first lead frame  610 , the second element  616  is partially connected to an upper portion of the fifth element  618 . That is, a lower portion of the first lead frame  610  corresponding to the second element  616  and the fifth element  618  is partially separated from an upper portion thereof. However, in the first lead frame  610 , the second element  616  is partially connected to the upper portion of the fifth element  618  by the first mount  611  and the first protrusion  619 . In the first lead frame  610 , a space between the second element  616  and the fifth element  618  is filled with the main body  630 . With this structure, a bonding area between the first lead frame  610  and the main body  630  increases, thereby improving bonding strength therebetween. Further, this structure allows a material for the main body  630  to flow efficiently through a gap between the first lead frame  610  and the second lead frame  620 . As a result, air tightness between the main body  630  and the first lead frame  610  and the second lead frame  620  can improve. Further, air or gas injected into the cavity  631  of the light emitting diode package  700  (see  FIG. 22  to  FIG. 24 ) during a packaging process or generated in the cavity thereof after the packaging process can be discharged through the upper portion of the first lead frame  610  having a separation space. 
     The third element  625  extends from the second terminal  623  to be connected to the fourth element  626 . Further, the fourth element  626  extends from a portion of the third element  625  and has a smaller width than the third element  625 . The fourth element  626  has an elongated shape extending towards the other side surface of the main body  630 . 
     According to this embodiment, all corners of the first lead frame  610  and the second lead frame  620  are formed to have a radius of curvature. As the corners of the first lead frame  610  and the second lead frame  620  have a radius of curvature, a bonding area between each of the first lead frame  610  and the second lead frame  620  and the main body  630  increases, thereby improving bonding strength therebetween. In a structure where each of the lead frames has angled corners, the corners of the lead frames cannot be completely filled with a resin for the main body, and a space can be generated between the lead frames and the main body  630 . However, according to this embodiment, the corners of the first lead frame  610  and the second lead frame  620  have a radius of curvature and thus can be completely filled with the resin for the main body  630 . Thus, the package substrate  600  according to this embodiment can have improvement in air tightness between each of the first lead frame  610  and the second lead frame  620  and the main body  630 . 
     In this embodiment, the first lead frame  610  is formed with two first through-holes  641  and the second lead frame  620  is also formed with two second through-holes  642 , as shown in  FIG. 16 . The first through-holes  641  are disposed in the first element  615  and are formed to penetrate the first lead frame  610  from the upper surface of the first lead frame  610  to the lower surface thereof. In addition, the second through-holes  642  are disposed in the third element  625  and are formed to penetrate the second lead frame  620  from the upper surface of the second lead frame  620  to the lower surface thereof. 
     The two first through-holes  641  and the two second through-holes  642  are filled with the main body  630 , thereby improving bonding strength between each of the first lead frame  610  and the second lead frame  620  and the main body  630 . 
     According to this embodiment, the first through-holes  641  and the second through-holes  642  are formed to have sizes that can be formed by injection molding of the first lead frame  610  and the second lead frame  620 . In addition, the two first through-holes  641  and the two second through-holes  642  may be formed as large as possible in the first element  615  and the third element  625 . As the size of each of the first through-holes  641  and the second through-holes  642  increases, air tightness between the first and second lead frames and the main body  630  can be further improved. That is, each of the first through-holes  641  and the second through-holes  642  may be formed to a size in consideration of the injection molding process of the first lead frame  610  and the second lead frame  620 , bonding strength and air tightness between each of the first lead frame  610  and the second lead frame  620  and the main body  630 . For example, the first through-holes  641  and the second through-holes  642  may have a diameter d 5  of 300 μm. 
     In addition, referring to  FIG. 16 , a first curved corner A of each of the first lead frame  610  and the second lead frame  620  has a different radius of curvature than a second curved corner B thereof. The first curved corner A of the first lead frame  610  is a portion at which the first element  615  is connected to the second element  616 , and faces a corner of the fourth element  626  of the second lead frame  620 . In addition, the first curved corner A of the second lead frame  620  is a portion at which the third element  625  is connected to the fourth element  626 , and faces a corner of the fifth element  618  of the first lead frame  610 . 
     The first connecting portion  614  of the first lead frame  610  and the second connecting portion  624  of the second lead frame  620  contact an electrically conductive bonding agent. Here, since the first curved corner A corresponds to a portion of each of the first connecting portion  614  and the second connecting portion  624 , the width of which abruptly decreases, the electrically conductive bonding agent is more likely to spreading from the interior of each of the first connecting portion  614  and the second connecting portion  624  towards the main body  630  through the first curved corner A than other regions of the first and second lead frames. When the electrically conductive bonding agent contacting the first connecting portion  614  spreads to contact the second connecting portion  624  or the electrically conductive bonding agent contacting the second connecting portion  624  spreads to contact the first connecting portion  614 , short circuit can occur between the first lead frame  610  and the second lead frame  620 . To prevent this problem, it is desirable that the first curved corner A of the first lead frame  610  be spaced apart as far as possible from the corner of the fourth element  626  of the second lead frame  620  facing the first curved corner A. In addition, it is desirable that the first curved corner A of the second lead frame  620  be spaced apart as far as possible from the corner of the fifth element  618  of the first lead frame  610  facing the first curved corner A. Accordingly, the first curved corner A of each of the first lead frame  610  and the second lead frame  620  has a small radius of curvature in order to be spaced apart as far as possible from the corner of the other lead frame facing the first curved corner A. 
     The second curved corner B of the first lead frame  610  is a portion of the first element  615  subjected to rounding treatment such that the width of the first element  615  is decreased from the same width as the first terminal  613 . In addition, the second curved corner B of the second lead frame  620  is a portion of the third element  625  subjected to rounding treatment such that the width of the third element  625  is decreased from the same width as the second terminal  623 . The second curved corner B of each of the first lead frame  610  and the second lead frame  620  is placed near the side surface of the main body  630  in the minor axis direction thereof. 
     The opposite side surfaces of the main body  630  in the minor axis direction thereof have a smaller bonding area with respect to the first lead frame  610  and the second lead frame  620  than the central portion of the main body  630 . Accordingly, the second curved corners B of the first lead frame  610  and the second lead frame  620  placed near the opposite side surfaces of the main body  630  are formed to have a large radius of curvature in order to increase the bonding area with respect to the main body  630 . Further, since the second curved corners B of the first lead frame  610  and the second lead frame  620  have a large radius of curvature, the main body  630  can be brought into close contact with the second curved corners B. Accordingly, bonding strength and adhesion between each of the first lead frame  610  and the second lead frame  620  and the main body  630  may improve by the second curved corners B of the first lead frame  610  and the second lead frame  620  having a large radius of curvature. The light emitting diode package including the package substrate  600  has good air tightness, thereby preventing foreign matter including gas, moisture, and dust from entering the light emitting diode package. 
     As such, according to this embodiment, the first lead frame  610  and the second lead frame  620  are formed such that the second curved corners B have a larger radius of curvature than the first curved corners A, in consideration of prevention of short circuit due to the electrically conductive bonding agent and improvement in bonding strength and adhesion to the main body  630 . 
     Further,  FIG. 18  is a cross-sectional view (E 1 -E 2 ) taken in the major axis direction of the package substrate  600  according to the third embodiment.  FIG. 19  is a cross-sectional view (E 3 -E 4 ) taken in the major axis direction of the package substrate  600  according to the third embodiment. In addition,  FIG. 20  is a cross-sectional view (E 5 -E 6 ) taken in the minor axis direction of the package substrate  600  according to the third embodiment. Again  FIG. 15  illustrates E 1 -E 2 , E 3 -E 4 , E 5 -E 6  and E 7 -E 8 . 
     Referring to  FIG. 15  and  FIG. 18 , an inner wall of the main body  630  is formed with a groove  635  at an upper portion thereof. The groove  635  is formed on the main body  630  towards an outer wall of the main body  630 . The groove  635  is formed between the upper surface of the main body  630  and the inner wall thereof defining the cavity  631 . That is, an upper portion of the package substrate  600  has a multi-step structure wherein a corner connecting the upper surface of the main body  630  to the inner wall thereof is depressed by the groove  635 . 
     Although  FIG. 15  shows the groove  635  formed on the inner wall of the main body  630  in the major axis direction thereof, it should be understood that the location of the groove  635  is not limited thereto. For example, the groove  635  may be formed on the entire inner wall of the main body  630 . 
     When the cavity  631  is filled with the sealing member (not shown) or the volume of the sealing member expands due to temperature variation, the sealing member can overflow from the cavity  631  of the main body  630 . Then, the sealing member overflowing from the cavity  631  flows into the groove  635 . Accordingly, the groove  635  can prevent the sealing member from covering the upper surface of the main body  630 . 
     Comparing  FIG. 18  with  FIG. 20 , an inclination α 2  of the inner wall of the main body  630  in the minor axis direction is smaller than an inclination α 1  of the inner wall of the main body  630  in the major axis direction (α 1 ). Here, the inclination is defined between the bottom of the cavity  631  and the inner wall of the main body. That is, the inner wall of the main body  630  in the minor axis direction is steeper than the inner wall of the main body  630  in the major axis direction. 
     Referring to  FIG. 22  to  FIG. 24 , when the light emitting diode chip  710  is mounted on the package substrate  600 , a distance between the light emitting diode chip  710  and the inner wall of the main body  630  in the minor axis direction is shorter than a distance between the light emitting diode chip  710  and the inner wall of the main body  630  in the major axis direction. That is, the distance between a side surface the light emitting diode chip  710  and the inner wall of the main body  630  in the minor axis direction is short. Accordingly, the inclination of the inner wall of the main body  630  in the minor axis direction is set in consideration of the fact that the main body  630  has a limited width in the minor axis direction and is formed by injection molding. Further, it is desirable that light emitted through the side surface of the light emitting diode chip  710  be reflected in an upward direction of the package substrate  600 . Accordingly, the inner wall of the main body  630  in the minor axis direction may be formed to prevent the light emitted through the side surface of the light emitting diode chip  710  from reentering the light emitting diode chip  710  after being reflected by the inner wall of the main body  630 . As such, it is desirable that the inclination α 2  of the inner wall of the main body  630  in the minor axis direction be set in consideration of the distance to the light emitting diode chip  710 , the injection molding process, reentrance of light, and the like. 
     A shown in  FIG. 23 , the distance between the light emitting diode chip  710  and the inner wall of the main body  630  in the major axis direction is greater than that in the minor axis direction. That is, a sufficient space is formed between the light emitting diode chip  710  and the inner wall of the main body  630  in the major axis direction. Accordingly, it is desirable that the inclination α 1  of the inner wall of the main body  630  in the major axis direction be set to allow light emitted from the light emitting diode chip  710  to travel in the upward direction of the package substrate  600  instead of reentering the light emitting diode chip  710 . 
     For example, the inclination α 1  of the inner wall of the main body  630  in the major axis direction is 147° and the inclination α 2  of the inner wall of the main body  630  in the minor axis direction is 122°. 
     With this structure, the light emitting diode package  700  can prevent light emitted from the light emitting diode chip  710  from reentering the light emitting diode chip  710  after being reflected by the inner wall of the main body  630 , thereby minimizing light loss of the light emitting diode package. 
       FIG. 22  to  FIG. 24  are views of a light emitting diode package according to a further embodiment of the present disclosure. 
       FIG. 22  is a top view of the light emitting diode package according to a further embodiment.  FIG. 23  is a cross-sectional view (F 1 -F 2 ) of the light emitting diode package shown in  FIG. 22 .  FIG. 24  is a cross-sectional view (F 3 -F 4 ) of the light emitting diode package shown in  FIG. 22 . 
     The light emitting diode package  700  includes a package substrate  600 , a light emitting diode chip  710 , a Zener diode chip  720 , and a sealing member  750 . The package substrate  600  is the package substrate according to the third embodiment described with reference to  FIG. 12  to  FIG. 21 . 
     Bump pads  711  are disposed on a lower surface of the light emitting diode chip  710 . The bump pads  711  of the light emitting diode chip  710  include a bump pad electrically connected to an n-type semiconductor layer of the light emitting diode chip  710  and a bump pad electrically connected to a p-type semiconductor layer thereof. 
     The light emitting diode chip  710  is disposed on the first mount  611  and the second mount  621 . Here, an electrically conductive bonding agent  730  is interposed between the bump pads  711  and each of the first mount  611  and the second mount  621 . The light emitting diode chip  710  is secured to the first mount  611  and the second mount  621  and is electrically connected thereto by the electrically conductive bonding agent, as shown in  FIG. 24 . For example, the electrically conductive bonding agent  730  ( FIG. 23 ) is a solder. 
     The Zener diode chip  720  is disposed on the second Zener connecting portion  662  and is connected to the second Zener connecting portion  662  by a wire, as shown in  FIG. 23 . Here, the Zener diode chip  720  is provided on upper and lower surfaces thereof with bump pads  721  electrically connected to the Zener diode chip  720 . 
     An electrically conductive bonding agent  730  may be disposed between the bump pads  721  of the Zener diode chip  720  and the second Zener connecting portion  662 . Accordingly, the Zener diode chip  720  is secured to an upper portion of the second Zener connecting portion  662  and is electrically connected to the second Zener connecting portion  662  by the electrically conductive bonding agent  730 . 
     The first mount  611  and the first Zener connecting portion  661  are formed on the first lead frame  610  and are electrically connected to each other. Further, the second mount  621  and the second Zener connecting portion  662  are formed on the second lead frame  620  and electrically connected to each other. 
     As such, in the light emitting diode package  700  according to this embodiment, the light emitting diode chip  710  is electrically connected in parallel to the Zener diode chip  720 . 
     The cavity  631  of the package substrate  600 , which has the light emitting diode chip  710  and the Zener diode chip  720  therein, is filled with the sealing member  750 . 
     Although some embodiments have been described herein with reference to the accompanying drawings, it should be understood that these embodiments are provided for illustration only and are not to be construed in any way as limiting the present disclosure. Therefore, it should be understood that the scope of the present disclosure should be defined by the appended claims and equivalents thereto.