Patent Abstract:
Provided is a light emitting device and light unit using the same. The light emitting device comprises: a body that includes a horizontal surface; an electrode at least partially disposed in the body; two or more mounting parts protruding from the horizontal surface, wherein the two or more mounting parts are separated from each other by a space, and wherein each of the at least two or more mounting parts includes a surface that is inclined relative to the horizontal surface; and two or more light emitting diodes, each mounted on the inclined surface of a corresponding one of the two or more mounting parts and electrically connected to the electrode.

Full Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application claims priority under 35 U.S.C. §119 to Korean Patent Application No. 10-2009-0128529 filed on Dec. 21, 2009, which is hereby incorporated by reference in its entirety. 
       BACKGROUND 
       [0002]    A light emitting diode (LED) a semiconductor light emitting device converting current to light. In recent years, an LED can be implemented a light emitting device emitting white light having superior efficiency by using fluorescent material or by combining individual LEDs that emit three primary colors. 
         [0003]    Also, since the luminance of the light emitting device using an LED increases gradually, the light emitting device is being used as a light source in various fields, such as a backlight for displays, a lighting display, an image display, etc. 
       SUMMARY 
       [0004]    Embodiments provide a light emitting device that allows an orientation angle to be adjusted inside a package, has superior light efficiency, and can guarantee heat radiation performance. 
         [0005]    Embodiments also provide a light unit that has superior light efficiency and can decrease the number of light emitting devices. 
         [0006]    In one embodiment, a light emitting device comprises: a body that includes a horizontal surface; an electrode at least partially disposed in the body; two or more mounting parts protruding from the horizontal surface, wherein the two or more mounting parts are separated from each other by a space, and wherein each of the at least two or more mounting parts includes a surface that is inclined relative to the horizontal surface; and two or more light emitting diodes, each mounted on the inclined surface of a corresponding one of the two or more mounting parts and electrically connected to the electrode. 
         [0007]    In another embodiment, a light emitting device comprises: a semiconductor body including a first surface; an insulating layer over at least a portion of the first surface; an electrode over at least a portion of the insulating layer; a mounting part projecting from the insulating layer, the mounting part including a second surface that is inclined relative to the first surface; and a light emitting diode mounted on the second surface and electrically connected to the electrode. 
         [0008]    In a further embodiment, a light unit comprises: a light guide panel; and one or more light emitting devices providing light to the light guide panel, wherein each of the one or more light emitting devices comprises: a body that includes a horizontal surface; an electrode at least partially disposed in the body; two or more mounting parts protruding from the horizontal surface, wherein the two or more mounting parts are separated from each other by a space, and wherein each of the at least two or more mounting parts includes a surface that is inclined relative to the horizontal surface; and two or more light emitting diodes, each mounted on the inclined surface of a corresponding one of the two or more mounting parts and electrically connected to the electrode. 
         [0009]    In still another embodiment, a light unit comprises: a light guide panel; and one or more light emitting devices providing light to the light guide panel, wherein each of the one or more light emitting devices comprises: a semiconductor body including a first surface; an insulating layer over at least a portion of the first surface; an electrode over at least a portion of the insulating layer; a mounting part projecting from the insulating layer, the mounting part including a second surface that is inclined relative to the first surface; and a light emitting diode mounted on the second surface and electrically connected to the electrode. 
         [0010]    The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is a plane view of a light emitting device according to a first embodiment; 
           [0012]      FIG. 2  is a cross-sectional view of a light emitting device according to the first embodiment; 
           [0013]      FIG. 3  is a cross-sectional view of a light emitting device according to a second embodiment; 
           [0014]      FIG. 4  is a cross-sectional view of a light emitting device according to a third embodiment; 
           [0015]      FIG. 5  is a cross-sectional view of a light emitting device according to a fourth embodiment; 
           [0016]      FIG. 6  is a cross-sectional view of a light emitting device according to a fifth embodiment; 
           [0017]      FIG. 7  is a cross-sectional view of a light emitting device according to a sixth embodiment; 
           [0018]      FIG. 8  is a cross-sectional view of a light emitting device according to a seventh embodiment; 
           [0019]      FIG. 9  is a cross-sectional view of a light emitting device according to an eighth embodiment; 
           [0020]      FIG. 10  is a schematic view showing irradiation state of light emitted from a light emitting diode according to a related art; 
           [0021]      FIGS. 11 through 13  are schematic views showing irradiation states of lights emitted from light emitting diodes according to embodiments; 
           [0022]      FIG. 14  is a schematic view of a light unit according to a first embodiment; 
           [0023]      FIG. 15  is a schematic view of a light unit according to a second embodiment; 
           [0024]      FIG. 16  is a disassembled perspective view of a backlight unit including a light emitting device or a light emitting device package according to an embodiment; and 
           [0025]      FIG. 17  is a perspective view of a lighting unit using a light emitting device package according to an embodiment. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0026]    Reference will now be made in detail to the embodiments of the present disclosure, examples of which are shown in the accompanying drawings. In the following description, it will be understood that when a layer (or film) is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Further, it will be understood that when a layer is referred to as being “under” another layer, it can be directly under the other layer, and one or more intervening layers may also be present. In addition, it will also be understood that when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. In the figures, the dimensions of layers and regions are exaggerated for clarity of illustration. In addition, the dimension of each part does not reflect an actual size. 
         [0027]      FIG. 1  is a plane view of a light emitting device according to a first embodiment,  FIG. 2  is a cross-sectional view of a light emitting device according to the first embodiment, and  FIG. 3  is a cross-sectional view of a light emitting device according to a second embodiment and exemplarily shows that the current embodiment is applied to a lead frame package type light emitting device. 
         [0028]    As shown in  FIGS. 1 and 2 , a light emitting device  100  according to the first embodiment includes a body  120  having a cavity  113 , a first electrode  130  and a second electrode  132  disposed in the body  120 , and a heat radiation member  110  having inclination surfaces for mounting a plurality of light emitting diodes  140 ,  150  in the cavity  113  and thermally connected to the light emitting diodes  140 ,  150 . The heat radiation member is formed within and exposed through an opening in the body. 
         [0029]    Herein, the cavity  113  in which the light emitting device  100  is mounted may be sealed by using a sealant (not shown). 
         [0030]    The cavity  113  in which the light emitting diodes  140 ,  150  are mounted may be formed at an upper portion of the body  120 . The body  120  may be formed of various materials such as ceramic, silicon, resin, etc. The body  120  may be formed in a single body structure using an injection molding, or in a multi-layered structure. 
         [0031]    The cavity  113  may be formed in a concave container shape, such as a cup shape, a polygonal shape, an elliptical shape, a circular shape, etc. Herein, a circumferential surface of the cavity  113  may be formed vertically or with a predetermined slope in consideration of distribution angles of the mounted light emitting diodes  140 ,  150 . A surface of the cavity  113  may be coated or deposited with a high reflectivity material, for example, white photo solder resist (PSR) ink, silver (Ag), aluminum (Al) or the like, so that the luminous efficiency of the light emitting device  100  can be enhanced. 
         [0032]    One terminals of the first and second electrodes  130  and  132  may be electrically connected to the light emitting diodes  140  and  150 , respectively, and the other terminals may be electrically connected to a substrate (not shown) on which the light emitting device  100  is mounted, to supply power to the light emitting diodes  140  and  150 . Therefore, the first and second electrodes  130  and  132  may be formed such that one terminals are disposed inside the body  120  on which the light emitting diodes  140  and  150  are mounted, and the other terminals are exposed to an outer lower side of the body  120 . While the present embodiment exemplarily shows and describes that two electrodes  130  and  132  are formed, it is to be understood that two or more electrodes may be formed according to the number of the light emitting diodes. Also, the first and second electrodes  130  and  132  may be modified in various shapes, such as a shape enclosing the body  120  or in a shape the other terminals of which are branched. The light emitting diodes  140  and  150  may be provided in a structure in which light emitting chips  142  and  152  are formed on dies  144  and  154 , respectively. Each of the light emitting diodes  140  and  150  may be at least one of a red light emitting diode emitting red light, a green light emitting diode emitting green light, and a blue light emitting diode emitting blue light, and is not limited thereto. In this embodiment, since the light emitting diodes  140 ,  150  are two or more, it is also possible to apply the light emitting diodes  140 ,  150  each emitting a different color light. 
         [0033]    The heat shielding member  110  is formed of material such as metal, resin or the like having a good thermal conductivity, and is thermally connected to the light emitting diodes  140 ,  150 . At an upper portion of the heat shielding member  110 , a first mounting part  115  having an inclination surface on which the first light emitting diode  140  is mounted, and a second mounting part  117  having an inclination surface on which the second light emitting diode  150  is mounted, may be formed. 
         [0034]    As shown in  FIG. 1 , the first mounting part  115  and the second mounting part  117  may be arranged in a diagonal direction on a parallel line having a spacing distance D. Thus, in the case where the first mounting part  115  and the second mounting part  117  may be arranged in a diagonal direction, the spacing distance D between the first light emitting diode  140  and the second light emitting diode  150  can be maximized, so that heat generated from each of the first and second light emitting diodes  140 ,  150  can be effectively radiated. These mounting parts  115 ,  117  may be formed by two or more mounting parts according to the number of light emitting diodes which are being mounted, and may be arranged in various configurations in consideration of the orientation angle and heat radiation characteristic. 
         [0035]    Meanwhile, in the light emitting device  100  according to the first embodiment exemplarily shown in  FIG. 2 , the first mounting part  115  and the second mounting part  117  are formed spaced apart from each other, whereas in the light emitting device  100  according to a second embodiment exemplarily shown in  FIG. 3 , the first mounting part  115  and the second mounting part  117  are formed without a spacing therebetween. 
         [0036]    In the light emitting device  100  according to the first embodiment exemplarily shown in  FIG. 2 , the inclination surface of the first mounting part  115  is formed in the left (L) direction, and the inclination surface of the second mounting part  117  is formed in the right (R) direction. Therefore, when the light emitting diodes  140 ,  150  are mounted on the mounting parts  115  and  117 , respectively, the direction of light emitted from the first light emitting diode  140  is inclined in the left (L) direction with respect to a center line, and the direction of light emitted from the second light emitting diode  150  is inclined in the right (R) direction with respect to the center line. Herein, as the slopes a and p of the first and second mounting parts  115  and  117  increase, the orientation angles of the lights emitted from the first and second light emitting diodes  140 ,  150  are directed toward the left (L) or right (R) direction from the center line. Therefore, by adjusting the slopes α and β of the first and second mounting parts  115 ,  117 , it is possible to adjust the orientation angle at a desired angle. 
         [0037]    Meanwhile, the light emitting device  100  according to the second embodiment shown in  FIG. 3  has the same constitution that the first and second mounting parts  115  and  117  are respectively formed with inclination surfaces having the corresponding slopes α and β, as the light emitting device according to the first embodiment shown in  FIG. 2  except that there is no spacing between the first mounting part  115  and the second mounting part  117 . That is, the first mounting part  115  and the second mounting part  117  may be arranged on the same line or may be arranged at positions parallel to each other but without a spacing therebetween. Thus, in the case where there is no spacing between the first and second mounting parts  115  and  117 , it is possible to adjust the orientation angle of the light emitting device  100  by adjusting the tile angles α and β of the first and second mounting parts  115  and  117 . 
         [0038]      FIG. 4  is a cross-sectional view of a light emitting device according to a third embodiment, and  FIG. 5  is a cross-sectional view of a light emitting device according to a fourth embodiment.  FIGS. 3 and 4  exemplarily show that the current embodiment is applied to a lead frame package type light emitting devices. In describing the third and fourth embodiments, the same constitutions as those in the first and second embodiments will be referred from the previous description and thus the repeated description will be omitted. 
         [0039]    Each of light emitting devices  100  according to the third and fourth embodiments includes a body  120 , a first electrode  130  and a second electrode  132  disposed inside the body  120  and electrically connected to light emitting devices  140  and  150 , a heat radiation member  110  having inclination surfaces for mounting light emitting diodes  140 ,  150  in the cavity  113  and thermally connected to the light emitting diodes  140 ,  150 , and a lens part  160  formed at a light emitting region of the body  120  on which the light emitting diodes  140 ,  150  are mounted, scattering or focusing light. 
         [0040]    The cavity  113  may be sealed by using a transparent sealant (not shown). A fluorescent material for converting light emitted from the light emitting diodes  140 ,  150  to a light having a predetermined color may be added to the transparent sealant. 
         [0041]    The lens part  160  may be disposed on the light emitting diodes  140 ,  150  to change the orientation angle of the light emitted from the light emitting diodes  140 ,  150 . The lens part  160  may be disposed directly in contact with the light emitting diodes  140 ,  150  or apart from the light emitting diodes  140 ,  150 , and has a shape for scattering or focusing light. For example, the lens part  160  may be formed in various shapes, such as a semispherical shape an upper surface of which is convex, or in a shape having a convex upper surface and a concave portion formed in the convex upper surface. Also, according to the directions and slopes of the inclination surfaces on which the light emitting diodes  140 ,  150  are mounted, the lens part  160  may be formed in a asymmetric semispherical shape in which only a region corresponding to the light emitting region is protruded or recessed. The lens part  160  may be formed of a material including a transparent resin material such as silicon or epoxy, and may include a fluorescent material at least a portion thereof. 
         [0042]    Therefore, lights emitted from the light emitting diodes  140 ,  150  mounted on the mounting parts  115 ,  117  may be scattered or focused by the lens part  160  and then emitted. 
         [0043]      FIG. 6  is a cross-sectional view of a light emitting device according to a fifth embodiment, and  FIG. 7  is a cross-sectional view of a light emitting device according to a sixth embodiment.  FIGS. 6 and 7  exemplarily show that the current embodiments are applied to wafer level package type light emitting devices. 
         [0044]    As shown in  FIG. 6 , the light emitting device  100  according to the fifth embodiment includes a body  210  having a cavity  213 , an insulating layer  212  on a surface of the body  210 , first electrode  130  and second electrode  132  on the body  210 , a reflective layer  230  formed on at least some region of the insulating layer, reflecting light, and mounting parts  215 ,  217  providing inclination surfaces for mounting light emitting diodes  240 ,  250 . The cavity  213  in which the light emitting diodes  240 ,  250  are mounted may be sealed by using a sealant (not shown). 
         [0045]    The cavity  213  in which the light emitting devices  240 ,  250  are mounted may be formed at an upper portion of the body  210 . The body  210  may be formed of various materials such as silicon (Si), aluminum (Al), aluminum nitride (AlN), aluminum oxide (AlO x ), photo sensitive glass (PSG), sapphire (Al 2 O 3 ), beryllium oxide (BeO), or the like. 
         [0046]    The cavity  213  may be formed in a concave container shape, such as a cup shape, a polygonal shape, an elliptical shape, a circular shape, etc. Herein, a circumferential surface of the cavity  213  may be formed vertically or with a predetermined slope in consideration of distribution angles of lights emitted from the mounted light emitting diodes  240 ,  250 . The cavity  213  may be formed with various methods according to the material of the body  210 . For example, when the body  210  is formed of silicon (Si), the cavity  213  may be formed by performing a wet etching. 
         [0047]    The insulating layer  212  prevents the body  210  from being electrically shorted to the first and second electrodes  220 ,  222 , the reflective layer  230 , an external power, or the like. The insulating layer  212  may be formed of at least one of silicon oxide (SiO 2 , Si x O y ), silicon nitride (Si 3 N 4 , Si x N y ), silicon oxynitride (SiO x N y ), and aluminum oxide (Al 2 O 3 ), preferably, silicon oxide (SiO 2 , Si x O y ), but the invention is not limited thereto. Also, in the case where the body  210  is formed of insulator such as aluminum nitride (AlN), aluminum oxide (AlO x ), or the like, the insulating layer  212  may not be formed. 
         [0048]    The first electrode  220  and the second electrode  222  may be formed on the insulating layer  212  to supply power to the light emitting devices  240 ,  250 . The first electrode  220  and the second electrode  222  may be formed separately as a positive electrode and a negative electrode, and may be formed in two or more electrodes. 
         [0049]    The reflective layer  230  may be formed at a position capable of efficiently reflecting lights emitted from the light emitting diodes  240 ,  250 , for example, inside the cavity  213  of the body  210 , but the invention is not limited thereto. The reflective layer  230  may have a multi-layer structure, for example, a Ti/Ag structure including a titanium (Ti) layer and a silver (Ag) layer stacked sequentially. 
         [0050]    The light emitting diodes  240  and  250  may be provided in a structure in which light emitting chips  242  and  252  are formed on dies  244  and  254 , respectively. Each of the light emitting diodes  240  and  250  may be at least one of a red light emitting diode emitting red light, a green light emitting diode emitting green light, and a blue light emitting diode emitting blue light, but the invention is not limited thereto. In this embodiment, since the light emitting diodes  240  and  250  are two or more, it is also possible to apply the light emitting diodes  240 ,  250  each emitting a different color light. 
         [0051]    Mounting parts  215  and  217  for mounting the light emitting diodes  240  and  250  are formed on the insulating layer  212 . By mounting the light emitting diodes  240  and  250  on the mounting parts  215  and  217 , respectively, the light emitting diodes  240  and  250  are fixed with a slope according to the slopes α and β of the mounting parts  215  and  217 . Accordingly, the orientation angle of the light emitting device  200  varies with the mounting angle of each of the light emitting diodes  240  and  250 . 
         [0052]    The mounting parts  215 ,  217  may be formed by two or more mounting parts according to the number of light emitting diodes which are being mounted, and may be arranged in various configurations in consideration of the orientation angle and heat radiation characteristic. The current embodiment exemplarily shows that the first light emitting diode  240  is mounted on the inclination surface of the first mounting part  215  and the second light emitting diode  250  is mounted on the inclination surface of the second mounting part  217 . 
         [0053]    For example, the inclination surface of the first mounting part  215  may be formed in the left (L) direction, and the inclination surface of the second mounting part  217  may be formed in the right (R) direction. Therefore, when the light emitting diodes  240  and  250  are mounted on the mounting parts  215  and  217 , respectively, the direction of light emitted from the first light emitting diode  240  is inclined in the left (L) direction with respect to a center line, and the direction of light emitted from the second light emitting diode  250  is inclined in the right (R) direction with respect to the center line. Herein, as the slopes α and β of the mounting parts  215  and  217  increase, the orientation angles of the lights emitted from the first and second light emitting diodes  240  and  250  are directed toward the left (L) or right (R) direction from the center line. Therefore, by adjusting the slopes α and β of the mounting parts  215  and  217 , it is possible to adjust the orientation angle at a desired angle. 
         [0054]      FIG. 7  is a cross-sectional view of a light emitting device according to a sixth embodiment, and exemplarily shows a wafer level package type light emitting device. In describing the sixth embodiment, the same constitution as that in the third embodiment will be referred from the previous description and thus the repeated description will be omitted. 
         [0055]    The light emitting device  200  according to the sixth embodiment includes mounting parts  215  and  217  providing inclination surfaces for mounting plural light emitting diodes  240  and  250  in a cavity of a body  210 , and a lens part  260  formed at a light emitting region of the cavity  213  in which the light emitting diodes  240  and  250  are mounted, scattering or focusing light. 
         [0056]    The cavity  213  may be sealed by using a transparent sealant (not shown). A fluorescent material for converting light emitted from the light emitting diodes  240  and  250  to a light having a predetermined color may be added to the transparent sealant. 
         [0057]    The lens part  260  may be disposed on the light emitting diodes  240  and  250  to change the orientation angles of lights emitted from the light emitting diodes  240  and  250 . The lens part  260  may be disposed directly in contact with the light emitting diodes  240  and  250  or apart from the light emitting diodes  240  and  250 , and has a shape for scattering or focusing light. For example, the lens part  260  may be formed in various shapes, such as a semispherical shape an upper surface of which is convex, or in a shape having a convex upper surface and a concave portion formed in the convex upper surface. Also, according to the directions and slopes of the inclination surfaces on which the light emitting diodes  240  and  250  are mounted, the lens part  260  may be also formed in a asymmetric semispherical shape in which only a region corresponding to the light emitting region is protruded or recessed. The lens part  260  may be formed of a material including a transparent resin material such as silicon or epoxy, and may include a fluorescent material at least a portion thereof. 
         [0058]    The light emitting device  200  according to the sixth embodiment exemplarily shows that the inclination surface of the first mounting part  215  is formed in the left (L) direction and the inclination surface of the second mounting part  217  is formed in the right (R) direction. Therefore, when the light emitting diodes  240  and  250  are mounted on the mounting parts  215  and  217 , respectively, the direction of light emitted from the first light emitting diode  240  is inclined in the left (L) direction with respect to a center line, and the direction of light emitted from the second light emitting diode  250  is inclined in the right (R) direction with respect to the center line. 
         [0059]    The lights emitted from the light emitting diodes  240  and  250  mounted on the mounting parts  215  and  217  may be scattered or focused by the lens part  260  and then emitted. Therefore, by modifying the shape of the lens part  260 , it is possible to enhance the orientation angle and light emitting characteristics of the light emitting device  200 . 
         [0060]      FIG. 8  is a cross-sectional view of a light emitting device  300  according to a seventh embodiment, and  FIG. 9  is a cross-sectional view of a light emitting device  300  according to an eighth embodiment.  FIGS. 8 and 9  exemplarily show that the current embodiments are applied to chip on board (COB) type light emitting devices in which light emitting diodes  340  and  350  are mounted in a chip shape on a substrate  310 . 
         [0061]    As shown in  FIGS. 8 and 9 , the light emitting device  300  includes the substrate  310 , a plurality of mounting parts  315  and  317  providing inclination surfaces for mounting the plurality of light emitting diodes  340  and  350 , and a resin part  360  sealing the light emitting diodes  340  and  350 , and the light emitting diodes  340  and  350  may be electrically connected to the substrate  310  through a wire (not shown). 
         [0062]    The substrate  310  may use various substrates, such as a single-layer printed circuit board (PCB), a multi-layer PCB, an FPCB, a ceramic substrate, a metal substrate, etc. A lead frame or an electrode layer for supplying power may be patterned on the substrate  310 , and a reflective layer may be formed. Also, a cavity for mounting the light emitting diodes  340  and  350  may be formed. 
         [0063]    The light emitting diodes  340  and  350  may be arranged in plurality on the substrate in a row direction and/or a column direction, and are electrically connected to the substrate  310 . The light emitting diodes  340  and  350  may be fixed on the substrate  310  by using a wire bonding, a flip chip bonding, a die bonding, or the like. The light emitting diodes  340  and  350  may be at least one of a red light emitting diode emitting red light, a green light emitting diode emitting green light, and a blue light emitting diode emitting blue light, and are not limited thereto. In this embodiment, since the light emitting diodes  340  and  350  are two or more, it is also possible to apply the light emitting diodes  340  and  350  each emitting a different color light. 
         [0064]    The mounting parts  315  and  317  may be formed on the substrate  310  and provide inclination surfaces for mounting the light emitting diodes  340  and  350 . As the light emitting diodes  340  and  350  are mounted on the mounting parts  315  and  317 , the light emitting diodes  340  and  350  are fixed with slopes according to slopes of the mounting parts  315  and  317 . Therefore, the orientation angle of the light emitting device  300  varies with the slopes of the mounting parts  315  and  317 . The mounting parts  315  and  317  may be formed by processing the substrate  310  to allow mounting regions of the substrate  310  to be protruded with inclination surfaces, or by attaching a protruded and inclined structure capable of mounting the light emitting diodes  340  and  350  on the substrate  310 . 
         [0065]    The mounting parts  315  and  317  may be formed by two or more mounting parts according to the number of light emitting diodes which are being mounted, and may be arranged in various configurations in consideration of the orientation angle and heat radiation characteristic. The current embodiment exemplarily shows that the first light emitting diode  340  is mounted on the inclination surface of the first mounting part  315  and the second light emitting diode  350  is mounted on the inclination surface of the second mounting part  317 . 
         [0066]    In the case of the light emitting device  300  according to the seventh embodiment shown in  FIG. 8 , the inclination surface of the first mounting part  315  may be formed in the left (L) direction, and the inclination surface of the second mounting part  317  may be formed in the right (R) direction. Therefore, when the light emitting diodes  340  and  350  are mounted on the mounting parts  315  and  317 , respectively, the direction of light emitted from the first light emitting diode  340  is inclined in the left (L) direction with respect to a center line, and the direction of light emitted from the second light emitting diode  350  is inclined in the right (R) direction with respect to the center line. Herein, as the slopes α and β of the mounting parts  315  and  317  increase, the orientation angles of the lights emitted from the first and second light emitting diodes  340  and  350  are directed toward the left (L) or right (R) direction from the center line. Therefore, by adjusting the slopes α and β of the mounting parts  315  and  317 , it is possible to adjust the orientation angle at a wider angle. 
         [0067]    In the case of the light emitting device  300  according to the eighth embodiment shown in  FIG. 9 , an inclination surface of the first mounting part  315  and an inclination surface of the second mounting part  317  are formed facing each other. Therefore, when the light emitting diodes  340  and  350  are mounted on the mounting parts, respectively, the light emitted from the first light emitting diode  340  and the light emitted from the second light emitting diode  350  are directed toward a center line and focused. As the slopes of the mounting parts  315  and  317  increase, the lights emitted from the light emitting diodes  340  and  350  are oriented toward the center line. Therefore, by adjusting the slopes of the mounting parts  315  and  317 , the orientation angle ranges can be adjusted. 
         [0068]    Meanwhile, the light emitting diodes  340  and  350  mounted on the mounting parts  315  and  317  may be sealed by a resin part  360 . The resin part  360  may be formed in a semispherical shape or a convex lens shape using a transparent resin such as epoxy, and the material and shape of the resin part  360  may be modified according to the layout of the light emitting device  300 . Also, a fluorescent material changing the light emitting characteristic may be added to at least a region of the resin part  360 . 
         [0069]    As exemplarily described in the seventh embodiment and the eighth embodiment, in the COB type light emitting devices  300 , the plural mounting parts  315  and  317  having a slope are formed on the substrate  310  such that the light emitting diodes  340  and  350  are mounted with a slope with respect to a horizontal surface of the light emitting device  300 . Therefore, the light irradiation direction and the orientation angle can be adjusted without a large change in the structure of the light emitting device  300 . 
         [0070]      FIG. 10  is a schematic view showing irradiation state of light emitted from a light emitting diode according to a related art, and  FIGS. 11 through 13  are schematic views showing irradiation states of lights emitted from light emitting diodes according to the embodiments. 
         [0071]    As shown in  FIG. 10 , a light emitting diode  140  mounted in a light emitting device has an orientation angle of about 120°, and typically may have an orientation angle of about 110°-130°. Therefore, in the case where the light emitting diode  140  is mounted in a direction parallel to a horizontal surface, the irradiation direction of light is concentrated in a vertical direction and the orientation angle may be set to 110°-130°.  FIG. 10  exemplarily shows that the light is irradiated at an orientation angle of 120°. 
         [0072]      FIG. 11  is a schematic view showing irradiation state of light when two light emitting diodes  140  and  150  have inclination directions (L and R) opposite to each other and have the same slope (i.e., α=β) according to the embodiment. When the light emitting diodes  140  and  150  are mounted with slopes of α° and β° with respect to a horizontal surface, the irradiation direction of light is moved by α° and β° from a center line, respectively. 
         [0073]    The first mounting part  115  is disposed at the left (L) and has a slope of α° in the left direction. Accordingly, the orientation angle of the first light emitting diode  140  mounted on the first mounting part  115  is inclined by α° toward the left direction (L) from the center line. For example, when the orientation angle of the first light emitting diode  140  is 120°, the orientation angle is inclined by 60°+α° toward the left direction from the center line. 
         [0074]    The second mounting part  117  is disposed at the right (R) and has a slope of β° in the right direction. Accordingly, the orientation angle of the second light emitting diode  150  mounted on the second mounting part  117  is inclined by β° toward the right direction (R) from the center line. For example, when the orientation angle of the second light emitting diode  150  is 120°, the orientation angle is inclined by 60°+β° toward the right direction from the center line. 
         [0075]    Therefore, in the case of the light emitting device including the first light emitting diode  140  and the second light emitting diode  150 , the orientation angle may be expanded by α° in the left direction (L) and by β° in the right (R) direction. 
         [0076]      FIG. 12  is a schematic view showing irradiation state of light when two light emitting diodes  140  and  150  have inclination directions (L and R) opposite to each other, respectively and a slope α of a first mounting part  115  is greater than a slope β of a second mounting part  117  (i.e., α&gt;β) according to the embodiment. 
         [0077]    The first mounting part  115  is disposed at the left (L) and an inclination surface of the first mounting part  115  has the slope of α° in the left direction. Accordingly, the orientation angle of the first light emitting diode  140  mounted on the first mounting part  115  is inclined by α° toward the left direction (L) from the center line. For example, when the orientation angle of the first light emitting diode  140  is 120°, the orientation angle is inclined by 60°+α° toward the left direction from the center line. 
         [0078]    The second mounting part  117  is disposed at the right (R) and an inclination surface of the second mounting part  117  has the slope of β in the right direction. Accordingly, the orientation angle of the second light emitting diode  150  mounted on the second mounting part  117  is inclined by β° toward the right direction (R) from the center line. For example, when the orientation angle of the second light emitting diode  150  is 120°, the orientation angle is inclined by 60°+β° toward the right direction from the center line. 
         [0079]    Then, since the slope α of the first mounting part  115  is set greater than the slope β of the second mounting part  117  (i.e., α&gt;β), the orientation angle of the light emitting device including the first light emitting diode  140  and the second light emitting diode  150  is inclined toward the left direction as a whole. That is, by mounting two light emitting diodes  140  and  150  on the mounting parts  115  and  117  having different slopes, the orientation angle of the light emitting device can be adjusted in a desired direction. 
         [0080]      FIG. 13  is a schematic view showing irradiation state of light when two light emitting diodes  140  and  150  are mounted in a first mounting part  115  and a second mounting part  117 , inclination surfaces of which are formed facing each other. 
         [0081]    The first mounting part  115  is disposed at the left (L) and an inclination surface of the first mounting part  115  is formed with the slope of α° in the right (R) direction. Accordingly, the orientation angle of the first light emitting diode  140  mounted on the first mounting part  115  is inclined by α° toward the right direction (R) from the center line. Therefore, when the orientation angle of the first light emitting diode  140  is 120°, the orientation angle is inclined by 60°−α° toward the right direction from the center line. 
         [0082]    The second mounting part  117  is disposed at the right (R) and an inclination surface of the second mounting part  117  is formed with the slope of β° in the left (L) direction. Accordingly, the orientation angle of the second light emitting diode  150  mounted on the second mounting part  117  is inclined by β° toward the left direction (L) from the center line. Therefore, when the orientation angle of the second light emitting diode  150  is 120°, the orientation angle is inclined by 60°−β° toward the left direction from the center line. 
         [0083]    Accordingly, in the case of the light emitting device including the first light emitting diode  140  and the second light emitting diode  150 , the orientation angle may be reduced by α° in the left direction (L) and by β° in the right (R) direction. 
         [0084]    As described above, the embodiments can expand or reduce the orientation angle of the light emitting devices and adjust the orientation angle at a desired direction by adjusting the inclination directions and slopes of the mounting parts  115  and  117  on which the light emitting diodes  140  and  150  are mounted. 
         [0085]      FIG. 14  is a schematic view of a light unit  500  according to a first embodiment, and exemplarily shows an edge type backlight unit. 
         [0086]    As shown in  FIG. 14 , the light unit  500  includes a light guide panel  510  guiding light, and a light source  520  supplying the light guide panel  510  with light and including at least one or more light emitting devices having different orientation angles. 
         [0087]    The light guide panel  510  reflects, refracts and scatters lights emitted from the light emitting devices arranged at one side and converts the light to a plane light through a front surface thereof. The light guide panel  510  may be formed of a material, such as polycarbonate-series resin (PC), polymethylmethacrylate-series resin (PMMA), methacrylate-styrene copolymer (MS), or the like. 
         [0088]    The light source  520  includes a plurality of light emitting devices A, B, C, D, and is arranged at a side surface of the light guide panel  510  to provide light to the light guide panel  510 . The respective light emitting devices A, B, C, D have orientation angles that are different from one another according to the arrangement position thereof. The light emitting devices may have different orientation angles by mounting two or more light emitting diodes constituting each of the light emitting devices with a slope with respect to a mounted surface thereof. 
         [0089]    Among the light emitting devices A, B, C, D, the light emitting devices B and C positioned at a central portion of an edge of the light guide panel  510  may transfer light toward the light guide panel  510  without adjusting the orientation angles. 
         [0090]    On the other hand, the light emitting devices A and D positioned at both sides of the edge of the light guide panel  510  have the orientation angles set in a center direction of the light guide panel  510  so as to prevent the light from being leaked to an outside of the light guide panel  510 . 
         [0091]    Herein, packages of the respective light emitting devices A, B, C, D are mounted on the same plane, but light emitting diodes in each of the light emitting devices emit lights having different orientation angles according to slopes of surfaces on which the light emitting diodes are mounted. Accordingly, the orientation angles of the respective light emitting devices A, B, C, D can be adjusted without changing a design factor of the light emitting devices A, B, C, D. 
         [0092]    Also, since the light emitting devices A and D supply more light toward the center portion of the light guide panel  510 , the light emitting device B adjacent to the light emitting device A may be arranged with a relatively wide spacing distance. The light emitting device C adjacent to the light emitting device D may be also arranged with a relatively wide spacing distance. Therefore, it is possible to decrease the number of light emitting devices equipped in the light unit  500 . 
         [0093]      FIG. 15  is a schematic view of a light unit  550  according to a second embodiment and exemplarily shows a direct type backlight unit. 
         [0094]    As shown in  FIG. 15 , the light unit  550  includes a light diffusion plate  515  diffusing light, and a light source  525  supplying the light diffusion plate  515  with light and including at least one or more light emitting devices having different orientation angles. 
         [0095]    The light diffusion plate  515  may supply light generated from the light source  525  to a display panel (not shown) disposed above the light diffusion plate  515 . The diffusion plate  515  may be used to guarantee uniform luminance and chromaticity. The light diffusion plate  515  is disposed apart by a predetermined spacing from the light source  525 , and may selectively include optical sheets, such as a diffusion sheet, a prism sheet, a brightness enhancement film, a protection sheet, etc. 
         [0096]    The light source  525  includes a plurality of light emitting devices A, B, C, D, and is arranged at a side surface of the light diffusion plate  515  to provide light to the light diffusion plate  515 . The respective light emitting devices A, B, C, D have orientation angles that are different from one another according to the arrangement position thereof. 
         [0097]    Among the light emitting devices A, B, C, D, the light emitting devices B and C arranged at a central region of the light diffusion plate  515  can enhance light efficiency of the light unit  550  by adjusting the orientation angles at wider angles. 
         [0098]    The light emitting devices A and D arranged at an edge of the light diffusion plate  515  have the orientation angles set in a center direction of the light diffusion plate  515  so as to prevent the light from being leaked to an outside of the light diffusion plate  515 . 
         [0099]    Herein, packages of the respective light emitting devices A, B, C, D are mounted on the same plane, but light emitting diodes in each of the light emitting devices emit lights having different orientation angles according to slopes of surfaces on which the light emitting diodes are mounted. Accordingly, the orientation angles of the respective light emitting devices A, B, C, D can be adjusted without changing a design factor of the light emitting devices A, B, C, D. 
         [0100]    Also, in the case where the orientation angles of the light emitting devices A and D are set to wide angles, the light emitting device B adjacent to the light emitting device A may be arranged with a relatively wide spacing distance, and the light emitting device C adjacent to the light emitting device D may be also arranged with a relatively wide spacing distance. Therefore, it is possible to decrease the number of light emitting devices equipped in the light unit  550 . 
         [0101]    As described above, in the light units  500  and  550  according to the embodiments, the light emitting devices having orientation angles different according to the position of the light emitting devices are arranged, thereby capable of preventing light from being leaked to an outside of the light guide panel  510  or an outside of the light diffusion plate  515 , and thus enhancing the light efficiency. 
         [0102]      FIG. 16  is a disassembled perspective view of a backlight unit using a light emitting device package according to an embodiment. The backlight unit  1100  shown in  FIG. 16  is an example of lighting systems, and the invention is not limited thereto. 
         [0103]    Referring to  FIG. 16 , the backlight unit  1100  may include a bottom frame  1140 , a light guide member  1120  disposed in the bottom frame  1140 , and a light emitting module  1110  disposed at least one side surface of the light guide member  1120  or below the light guide member  1120 . Also, a reflective sheet  1130  may be disposed below the light guide member  1120 . 
         [0104]    The bottom frame  1140  may be formed in a box shape a top surface of which is opened such that the light guide member  1120 , the light emitting module  1110  and the reflective sheet  1130  can be received. The bottom frame  1140  may be formed of a metal or resin material, but the invention is not limited thereto. 
         [0105]    The light emitting module  1110  may include a substrate and a plurality of light emitting device packages mounted on the substrate according to the embodiments. The plurality of light emitting device packages may provide light to the light guide member  1120 . 
         [0106]    As shown in  FIG. 16 , the light emitting module  1110  may be disposed at least one of inner side surfaces of the bottom frame  1140 , and thus may provide light to at least one of the side surfaces of the light guide member  1120 . 
         [0107]    It is also to be understood that the light emitting module  1110  may be disposed below the bottom frame  1140  to provide light toward a bottom surface of the light guide member  1120 . However, since such a constitution may be modified according to the design of the backlight unit  1100 , the invention is not limited thereto. 
         [0108]    The light guide member  1120  may be disposed inside the bottom frame  1140 . The light guide member  1120  may convert the light provided from the light emitting module to a plane light source and guide the converted plane light source to a display panel (not shown). 
         [0109]    The light guide member  1120  may be, for example, a light guide panel (LGP). The LGP may be formed of, for example, one of acryl-series resin such as polymethyl metacrylate (PMMA), polyethylene terephthlate (PET), poly carbonate (PC), COC, and polyethylene naphthalate resin. 
         [0110]    An optical sheet  1150  may be disposed above the light guide member  1120 . 
         [0111]    The optical sheet  1150  may include, for example, at least one of a diffusion sheet, a prism sheet, a brightness enhancement sheet and a fluorescent sheet. For example, the optical sheet  1150  may be configured by the diffusion sheet, the prism sheet, the brightness enhancement sheet and the fluorescent sheet stacked. In this case, the diffusion sheet  1150  diffuses the light emitted from the light emitting module  1110  uniformly, and the diffused light may be focused on the display panel (not shown) by the prism sheet. At this time, the light emitted from the prism sheet is a randomly polarized light, and the brightness enhancement sheet may increase the polarization of the light emitted from the prism sheet. The prism sheet may be, for example, a vertical and/or horizontal sheet. Also, the brightness enhancement sheet may be, for example, a brightness enhancement film. Also, the fluorescent sheet may be a transparent plate or film including a fluorescent material. 
         [0112]    The reflective sheet  1130  may be disposed below the light guide member  1120 . The reflective sheet  1130  may reflect light emitted from the bottom surface of the light guide member  1120  toward a light emitting surface of the light guide member  1120 . 
         [0113]    The reflective sheet  1130  may be formed of, for example, resin material having good reflectivity, for example, PET, PC, PVC resins, or the like, but the invention is not limited thereto. 
         [0114]      FIG. 17  is a perspective view of a light unit using a light emitting device package according to an embodiment. The lighting unit  1200  of  FIG. 17  is an example of lighting systems and the invention is not limited thereto. 
         [0115]    Referring to  FIG. 17 , the lighting unit  1200  may include a case body  1210 , a light emitting module  1230  installed in the case body  1210 , and a connection terminal installed in the case body  1210 , receiving power from an external power source. 
         [0116]    The case body  1210  may be preferably formed of a material having good heat shielding characteristic, for example, a metal material or a resin material. 
         [0117]    The light emitting module  1230  may include a substrate  300 , and a light emitting device package  200  mounted on the substrate  300  according to at least one of the embodiments. 
         [0118]    The substrate  300  may be an insulator substrate on which a circuit pattern is printed, and may include, for example, a general printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, etc. 
         [0119]    Also, the substrate  300  may be formed of a material to efficiently reflect light, and a surface thereof may be formed in a color capable of efficiently reflecting light, for example, white color, or silver color. 
         [0120]    The light emitting device packages according to at least one of the embodiments may be mounted on the substrate  300 . Each of the light emitting device packages  200  may include at least one light emitting diode (LED). The light emitting diode may include a color LED emitting red, green, blue or white light, and a UV LED emitting ultraviolet (UV). 
         [0121]    The light emitting module  1230  may have a combination of several LEDs so as to obtain desired color and luminance. For example, the light emitting module  130  may have a combination of a white LED, a red LED, and a green LED so as to obtain a high color rendering index (CRI). A fluorescent sheet may be further disposed on a path of light emitted from the light emitting module  1230 . The fluorescent sheet converts the wavelength of the light emitted from the light emitting module. For example, when the light emitted from the light emitting module  1230  has a blue wavelength band, the fluorescent sheet may include a yellow fluorescent material, so that the light, which is emitted from the light emitting module  1230  and passes through the fluorescent sheet, finally appears as white light. 
         [0122]    The connection terminal  1220  may be electrically connected to the light emitting module  1230  to supply power to the light emitting module  1230 . As shown in  FIG. 17 , the connection terminal  1220  may be screwed and coupled to an external power, but the invention is not limited thereto. For example, the connection terminal  1220  may be made in a pin type and inserted into an external power, or may be connected to the external power through a power line. 
         [0123]    As described above, the lighting system may include at least one of a light guide member, a diffusion sheet, a prism sheet, a brightness enhancement sheet and a fluorescent sheet on a traveling path of light to obtain a desired optical effect. 
         [0124]    Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. 
         [0125]    Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.

Technology Classification (CPC): 7