Patent Publication Number: US-2010118509-A1

Title: Light source package, liquid crystal display device including light source package, and method of manufacturing the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Korean Patent Application No. 10-2008-0111700 filed on Nov. 11, 2008 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a light source package, a liquid crystal display device including a light source package, and a method of manufacturing the same, and more particularly, to a light source package having a large emission area and a low manufacturing cost, a liquid crystal display device including a light source package, and a method of manufacturing the same. 
     2. Description of the Related Art 
     A liquid crystal display (LCD) is one of the most commonly used flat panel displays (FPDs) and includes two substrates having electrodes formed thereon and a liquid crystal layer interposed therebetween. When a voltage is applied between the electrodes, liquid crystal molecules in the liquid crystal layer are rearranged to adjust the quantity of transmitted light. 
     Since the liquid crystal display device is not a self-emission display device, it includes a backlight assembly that emits light to a liquid crystal panel. 
     The backlight assembly includes, for example, a light source, a light guide plate, a plurality of optical sheets, and a reflecting sheet. A plurality of light sources may be arranged on at least one side of the light guide plate. 
     However, a dark portion is formed in a space between the plurality of light sources, which may cause uneven distribution of light emitted from the liquid crystal panel. 
     SUMMARY OF THE INVENTION 
     An aspect of the present invention provides a light source package having a large emission area and a low manufacturing cost. 
     Another aspect of the present invention provides a method of manufacturing a light source package having a large emission area and a low manufacturing cost. 
     Still another aspect of the present invention provides a liquid crystal display device including a light source package having a large emission area and a low manufacturing cost. 
     Yet another aspect of the present invention provides a method of manufacturing a liquid crystal display device including a light source package having a large emission area and a low manufacturing cost. 
     However, the aspects, features and advantages of the present invention are not restricted to the ones set forth herein. The above and other aspects, features and advantages of the present invention will become more apparent to one of ordinary skill in the art to which the present invention pertains by referencing a detailed description of the present invention given below. 
     According to an aspect of the present invention, a light source package includes: a package case including a bottom plate having a bottom plate flat portion, and a light source mounting plate that is formed by bending at least one end of the bottom plate and has a first inclination angle with respect to the bottom plate flat portion; a light source mounted on the light source mounting plate; and a package reflecting portion formed in the package case so as to have a second inclination angle with respect to the bottom plate flat portion and reflecting light emitted from the light source. 
     According to another aspect of the present invention, a light source package includes: a package case including a bottom plate and a plurality of package side walls formed along the edge of the bottom plate; a light source mounted on the bottom plate; and a package reflecting portion formed so as to be inclined with respect to the bottom plate and reflecting light emitted from the light source. 
     According to still another aspect of the present invention, there is provided a method of manufacturing a light source package, the method including: providing a package case including a bottom plate having a bottom plate flat portion and a light source mounting plate that is formed by bending at least one end of the bottom plate and has a first inclination angle with respect to the bottom plate flat portion, and a package reflecting portion formed in the package case so as to have a second inclination angle with respect to the bottom plate flat portion; and filling the package case with a protective resin. 
     According to yet another aspect of the present invention, a liquid crystal display device includes: a light guide plate; at least one light source package provided on at least one side of the light guide plate; and a lower receptacle accommodating the light guide plate and the light source package. The light source package includes: a package case including a bottom plate having a bottom plate flat portion, and a light source mounting plate that is formed by bending at least one end of the bottom plate and has a first inclination angle with respect to the bottom plate flat portion; a light source mounted on the light source mounting plate; and a package reflecting portion formed in the package case so as to have a second inclination angle with respect to the bottom plate flat portion and reflecting light emitted from the light source. 
     According to still yet another aspect of the present invention, a liquid crystal display device includes: a light guide plate; at least one light source package provided on at least one side of the light guide plate; and a lower receptacle accommodating the light guide plate and the light source package. The light source package includes: a package case including a bottom plate and a plurality of package side walls formed along the edge of the bottom plate; a light source mounted on the bottom plate; and a package reflecting portion formed so as to be inclined with respect to the bottom plate and reflecting light emitted from the light source. 
     According to yet still another aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, the method including: manufacturing a light source package by providing a package case including a bottom plate having a bottom plate flat portion and a light source mounting plate that is formed by bending at least one end of the bottom plate and has a first inclination angle with respect to the bottom plate flat portion, and a package reflecting portion formed in the package case so as to have a second inclination angle with respect to the bottom plate flat portion, and by filling the package case with a protective resin; and arranging the light source package on at least one side of the light guide plate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects and features of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: 
         FIG. 1  is an exploded perspective view illustrating a liquid crystal display device according to a first embodiment of the present invention; 
         FIG. 2  is a perspective view illustrating a light source package of the liquid crystal display device according to the first embodiment of the present invention; 
         FIG. 3A  is a diagram schematically illustrating the light source package of the liquid crystal display device according to the first embodiment of the present invention; 
         FIG. 3B  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a modification of the first embodiment of the present invention; 
         FIG. 4  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a second embodiment of the present invention; 
         FIG. 5  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a third embodiment of the present invention; 
         FIG. 6  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a fourth embodiment of the present invention; 
         FIG. 7  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a fifth embodiment of the present invention; 
         FIG. 8  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a sixth embodiment of the present invention; 
         FIG. 9  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a seventh embodiment of the present invention; 
         FIG. 10  is a diagram schematically illustrating a light source package of a liquid crystal display device according to an eighth embodiment of the present invention; 
         FIG. 11  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a ninth embodiment of the present invention; 
         FIG. 12  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a tenth embodiment of the present invention; 
         FIG. 13  is a diagram schematically illustrating a light source package of a liquid crystal display device according to an eleventh embodiment of the present invention; 
         FIG. 14  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a twelfth embodiment of the present invention; 
         FIG. 15  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a thirteenth embodiment of the present invention; 
         FIG. 16  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a fourteenth embodiment of the present invention; 
         FIG. 17  is a diagram schematically illustrating a gap between the light source packages according to the embodiments of the present invention; 
         FIGS. 18A and 18B  are diagrams schematically illustrating the length of the light source package according to the embodiments of the present invention and the length of a light source package according to a comparative example; 
         FIGS. 19A and 19B  are diagrams schematically illustrating the brightness distribution of the light source package according to the embodiments of the present invention and the brightness distribution of the light source package according to the comparative example; 
         FIGS. 20A and 20B  are diagrams schematically illustrating the light quantity distribution of the light source package according to the embodiments of the present invention and the light quantity distribution of the light source package according to the comparative example; 
         FIGS. 21A and 21B  are diagrams schematically illustrating the area of a dark portion in the liquid crystal display device according to the embodiments of the present invention and the area of a dark portion in a liquid crystal display device according to the comparative example; and 
         FIGS. 22A and 22B  to  28  are diagrams illustrating processes of a method of manufacturing a liquid crystal display device according to a fifteenth embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     Advantages and features of the present invention and methods of accomplishing the same may be understood more readily by reference to the following detailed description of preferred embodiments and the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims. Like reference numerals refer to like elements throughout the specification. 
     Spatially relative terms, such as “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Examples of a liquid crystal display device used in the present invention include a notebook computer, a monitor, a PMP (portable multimedia player), a PDA (personal digital assistant), a portable DVD (digital versatile disk) player, and a cellular phone. 
     Hereinafter, a liquid crystal display device according to a first embodiment of the present invention will be described in detail with reference to  FIGS. 1 to 3B . 
       FIG. 1  is an exploded perspective view illustrating the liquid crystal display device according to the first embodiment of the present invention.  FIG. 2  is a perspective view illustrating a light source package of the liquid crystal display device according to the first embodiment of the present invention.  FIG. 3A  is a diagram schematically illustrating the light source package of the liquid crystal display device according to the first embodiment of the present invention. 
     Referring to  FIG. 1 , the liquid crystal display device according to this embodiment of the present invention includes a liquid crystal panel assembly  110 , a light source package  1000 , an alignment plate  120 , a light guide plate  130 , an optical sheet  140 , a reflecting sheet  150 , a lower receptacle  160 , and an upper receptacle  170 . The liquid crystal panel assembly  110  includes a liquid crystal panel  113  including a thin film transistor substrate  111  and a color filter substrate  112 , liquid crystal (not shown), a gate tape carrier package  114 , a data tape carrier package  115 , and a printed circuit board  116 . 
     The liquid crystal panel  113  includes the thin film transistor substrate  111  that includes gate lines (not shown), data lines (not shown), a thin film transistor array, and pixel electrodes, and the color filter substrate  112  that includes a black matrix and a common electrode and is provided so as to face the thin film transistor substrate  111 . 
     The liquid crystal panel  113  is a laminate of the above-mentioned substrates, and is provided in the lower receptacle  160 , which will be described below. 
     The gate tape carrier package  114  is connected to the gate lines (not shown) formed on the thin film transistor substrate  111 , and the data tape carrier package  115  is connected to the data lines (not shown) formed on the thin film transistor substrate  111 . 
     The printed circuit board  116  is mounted with various parts that process all of the gate driving signals and the data driving signals for enabling the gate driving signals and the data driving signals to be input to the gate tape carrier package  114  and the data tape carrier package  115 , respectively. 
     The light guide plate  130  is provided such that at least one side faces the light source package  1000  and guides light emitted from the light source package  1000 . The light guide plate  130  may be formed of a translucent material capable of effectively guiding light, for example, an acrylic resin, such as PMMA (polymethyl methacrylate), or a material having a constant reflective index, such as polycarbonate (PC). 
     Light is incident on at least one side of the light guide plate  130  made of the above-mentioned material at an angle within the threshold angle of the light guide plate  130 . Therefore, the light is incident into the light guide plate  130 . When light is incident on the upper surface or the lower surface of the guide plate  130 , the incident angle of the light is beyond the threshold angle, and the light uniformly travels through light guide plate  130  without being emitted to the outside of the light guide plate  130 . A scattering pattern (not shown) may be formed on at least one of the upper surface and the lower surface of the light guide plate  130 . The scattering pattern scatters light incident on the upper surface or the lower surface of the light guide plate  130  to the liquid crystal panel  113 . 
     The light source package  1000  may be provided on at least one side of the light guide plate  130 . A point light source may be included in the light source package  1000  according to this embodiment, and an LED (light emitting diode) is used as an example of the point light source. In this embodiment, the LED is used as the light source, but the light source according to this embodiment is not limited to the LED. 
     The light source package  1000  according to this embodiment may be an edge type that is provided on at least one side of the light guide plate  130 . The light source package  1000  may be provided on only one side of the light guide plate  130 , or the light source packages may be provided on both sides of the light guide plate  130 . A plurality of light source packages  1000  may be arranged at predetermined intervals on the alignment plate  120 . Power is supplied to the light source packages  1000  through external power supply terminals  121  formed on the alignment plate  120 . 
     Light emitted from the light source package  1000  passes through the light guide plate  130  and the optical sheet  140 . The detailed structure of the light source package  1000  will be described in detail below. 
     At least one optical sheet  140  may be provided on the light guide plate  130 . The optical sheet  140  may include a diffusion sheet  141 , a prism sheet  142 , and a protective sheet  143 . 
     The diffusion sheet  141  is provided on the light guide plate  130  and improves the brightness uniformity of light incident from the light source package  1000 . That is, the diffusion sheet  141  diffuses light incident from the light source package  1000  and prevents light from being locally focused. 
     The prism sheet  142  is provided on the diffusion sheet  141 . The prism sheet focuses light diffused by the diffusion sheet  141  and emits the focused light. The prism sheet  142  may include first and second prism sheets having prism patterns that intersect each other. However, when only the first prism sheet can be used to ensure sufficient brightness and viewing angle, the second prism sheet may be omitted. 
     The protective sheet  143  may be provided on the prism sheet  142 . The protective sheet can not only protect the surface of the prism sheet  142 , but also diffuse light to obtain a uniform light distribution. 
     The reflecting sheet  150  is provided at a lower part of a lower receptacle  160 , and reflects light components that do not travel toward the liquid crystal panel  113  but are emitted from the lower surface of the light source package  1000  to the upper side. 
     The reflecting sheet  150  may be manufactured by dispersing a white pigment, such as titanium oxide, in a synthetic resin sheet. Air bubbles may be dispersed in the synthetic resin sheet in order to scatter light. 
     The reflecting sheet  150 , the optical sheet  140 , the light guide plate  130 , and the liquid crystal panel  113  are accommodated in the lower receptacle  160 . 
     The upper receptacle  170  is provided on the liquid crystal panel  113  so as to cover the upper surface of the liquid crystal panel  113 . 
     A window is formed in the upper surface of the upper receptacle  170  such that the liquid crystal panel  113  is exposed to the outside. The upper surface of the upper receptacle  170  may be bent downward to press the upper edge of the liquid crystal panel  113 . 
     The upper receptacle  170  may be coupled to the lower receptacle  160  by screws (not shown) and/or hooks (not shown). 
     Referring to  FIGS. 1 to 3A , the light source package  1000  includes a package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) and light sources  1100  provided in the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ). In this embodiment, an LED (light emitting diode) is used as an example of the light source  1100 , but the light source according to this embodiment is not limited thereto. 
     The LED, serving as the light source  1100 , includes a first conductive layer, a light-emitting layer, and a second conductive layer sequentially formed on a substrate. In the light-emitting layer, carriers (for example, electrons) in the first conductive layer and carriers (for example, holes) in the second conductive layer are coupled to emit light. 
     The light source  1100  is mounted to lead frames  1210  and  1220 , which will be described below. The lead frames  1210  and  1220  connect the light source  1100  to a light source mounting plate  1460  and serve as electrodes of the light source  1100 . The light source  1100  is connected to the lead frames  1210  and  1220  by wires  1310  and  1320 , respectively. 
     In this embodiment, a white LED is used as an example of the light source  1100 , but the present invention is not limited thereto. For example, a red, green, or blue LED or a combination thereof may be used as the light source. 
     The light source package  1000  may have a trapezoidal shape in a cross-sectional view. In this case, the light source package may have a package reflecting portion  1480  that protrudes from the center of the trapezoid upward. 
     The package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) includes a bottom plate ( 1410  and  1480 ) including a bottom plate flat portion  1410  and a light source mounting plate  1460  that is formed by bending at least one end of the bottom plate flat portion  1410  and has a first inclination angle θ 1  with respect to the bottom plate portion  1410 . In order to prevent irregular chromaticity, the light source mounting plates  1460  may be formed by bending both ends of the bottom plate flat portion  1410 . A connecting portion X between the light source mounting plate  1460  and the bottom plate flat portion  1410  may have a small thickness for easy bending. In this embodiment, the first inclination angle θ 1  may be an obtuse angle, or it may be an acute angle, as in a modification of the first embodiment of the present invention, which will be described below. 
     The first inclination angle θ 1  formed between the light source mounting plate  1460  and the bottom plate flat portion  1410  may be in a range of about 90 to about 150° such that uniform light can reach the center of the light source package  1000  that is distant from the light source  1100 . That is, an angle between a plane vertical to the bottom plate flat portion  1410  and the light source mounting plate  1460  may be in a range of about 0 to about 60°. In this case, the quantity of light emitted from the light source  1100  mounted to the light source mounting plate  1460  to the center of the light source package  1000  (ray directions b and c in  FIG. 3A ) may be more than that emitted in the vertical direction (ray direction a in  FIG. 3A ). That is, when the light source mounting plate  1460  is arranged at the first inclination angle θ 1  with respect to the bottom plate flat portion  1410 , the quantity of light emitted to the center of the light source package  1000  (ray directions b and c in  FIG. 3A ) may be more than that when the light source mounting plate  1460  is arranged in parallel to the bottom plate flat portion  1410 . 
     The package reflecting portion  1480  that reflects light emitted form the light source  1100  may be provided in the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ). The package reflecting portion  1480  is provided in the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) so as to have a second inclination angle θ 2  with respect to the bottom plate flat portion  1410 . The second inclination angle θ 2  may be smaller than 45° such that light reflected from the package reflecting portion  1480  is effectively emitted in a direction vertical to the bottom plate flat portion  1410 . 
     The second inclination angle θ 2  may be fixed, or it may vary depending on the distance from the bottom plate flat portion  1410 . That is, as the distance from the bottom plate flat portion  1410  is increased, the second inclination angle θ 2  may be increased or decreased. 
     The second inclination angle θ 2  may vary depending on the first inclination angle θ 1  such that light emitted from the light source  1100  is uniformly emitted from the entire emission surface facing the bottom plate flat portion  1410 . 
     The package reflecting portion  1480  reflects light emitted from the light source  1100  upward. In this embodiment, the package reflecting portion  1480  is a convex pattern that protrudes from the bottom plate flat portion  1410  to the inside of the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ). The package reflecting portion  1480  may have a trigonal prism shape, but the present invention is not limited thereto. The package reflecting portion  1480  may be formed by providing a reflective material on the bottom plate flat portion  1410  or by bending the bottom plate ( 1410  and  1480 ). In this embodiment, as the package reflecting portion  1480 , a single convex pattern having a trigonal prism shape is formed on the bottom plate flat portion  1410 . However, the shape and material forming the package reflecting portion  1480 , and the number of package reflecting portions are not limited thereto. 
     Light emitted from the light source mounting plate  1460  having the first inclination angle θ 1  with respect to the bottom plate flat portion  1410  travels in the horizontal direction to the center of the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) and is reflected from the package reflecting portion  1480 . In this way, light emitted from the light sources  1100  provided at both sides of the light source package  1000  can be uniformly emitted from the entire emission surface of the light source package  1000  facing the bottom plate flat portion  1410 . Arrows represented in a radial shape show light components that are uniformly emitted from the entire emission surface. 
       FIG. 3B  is a diagram schematically illustrating a light source package of a liquid crystal display device according to a modification of the first embodiment of the present invention. 
     Referring to  FIG. 3B , a light source mounting plate  1460  of the liquid crystal display device according to the modification of the first embodiment of the present invention may have the first inclination angle θ 1 , which is an acute angle, with respect to the bottom plate flat portion  1410 . In this case, the area of a vertical side wall  1420  is decreased by a value that is proportional to the bending angle of the light source mounting plate  1460 , and the connection side wall  1470  may be omitted. In this embodiment, the first inclination angle θ 1  may be in a range of about 30 to about 90°. 
     A second inclination angle −θ 2  formed between the package reflecting portion  1480  and the bottom plate flat portion  1410  may vary depending on the first inclination angle θ 1 , and the package reflecting portion may have a concave pattern. Light emitted from the light source  1100  can be uniformly emitted from the entire emission surface facing the bottom plate flat portion  1410  by changing the first inclination angle θ 1 , which is an acute angle, depending on the second inclination angle −θ 2 . 
     When the first inclination angle θ 1  is an acute angle, the shape of the package reflecting portion  1480  is not limited to the concave shape. In this case, the package reflecting portion may still have a convex shape, or it may be substantially parallel to the bottom plate flat portion  1410 . 
     The package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) may further include package side walls ( 1420  and  1470 ) connecting the bottom plate flat portion  1410  and the edge of the light source mounting plate  1460 . The package side walls ( 1420  and  1470 ) include vertical side walls  1420  that are provided along both sides of the bottom plate flat portion  1410  and face each other, and connection side walls  1470  that are provided along both sides of the light source mounting plate  1460  and are coupled to the vertical side walls  1420 . The vertical side walls  1420  and the connection side walls  1470  may be coupled to each other by fitting protruding portions  1470 a into engaging grooves  1420 a. In this way, the vertical side walls  1420  and the connection side walls  1470  are tightly coupled to each other such that no protective resin  1500  leaks to the outside. 
     The package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) may be formed of a plastic resin. The package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) may be formed of an organic material providing electrical insulation and having low light absorbance, such as silicon resin, epoxy resin, acrylic resin, fluororesin, or (Poly)-imide resin, or an inorganic material having low light absorbance, such as glass or silica gel. In addition, the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) may be formed of a thermosetting resin in order to prevent resin from being melted by heat during manufacture. 
     At least a portion of the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) is filled with the protective resin  1500 . As the protective resin  1500 , for example, any of the following resins may be used: epoxy resin, silicon resin, hard silicon resin, modified silicon resin, urethane resin, oxetane resin, acrylic resin, polycarbonate resin, and polyimide resin. In this embodiment, the upper surface of the protective resin  1500  may be flat, but the present invention is not limited thereto. 
     A metal reflecting layer (not shown) may be provided on the inner side surface of the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) in order to improve reflectance. 
     At least a portion of the protective resin  1500  may include a fluorescent material  1600 . The fluorescent material  1600  may include a transparent resin and a phosphor. The phosphor absorbs light emitted form the light source  1100  and converts it into light having a different wavelength. Any material may be used as the phosphor as long as it can absorb light emitted from the light source  1100  and convert it into light having a different wavelength. For example, the phosphor is preferably at least one selected from the following materials: a nitride-based phosphor or an oxynitride-based phosphor that is mainly activated by a lanthanoid element, such as Eu or Ce; an alkaline earth element halogen apatite phosphor, an alkaline earth metal element boride halogen phosphor, an alkaline earth metal element aluminate phosphor, alkaline earth element silicate, alkaline earth element sulfide, alkali earth element thiogallate, alkaline earth element silicon nitride, and germanate that are mainly activated by a lanthanoid element, such as Eu, or a transition metal element, such as Mn; rare earth aluminate and rare earth silicate that are mainly activated by a lanthanoid element, such as Ce; and an organic compound and an organic complex that are mainly activated by a lanthanoid element, such as Eu. The transparent resin is not particularly limited as long as it can uniformly disperse phosphors. For example, as the transparent resin, any of the following resins may be used: epoxy resin, silicon resin, hard silicon resin, modified silicon resin, urethane resin, oxetane resin, acrylic resin, polycarbonate resin, and polyimide resin. 
     In this embodiment, the fluorescent material  1600  is uniformly formed on the entire protective resin, but the present invention is not limited thereto. 
     Next, a liquid crystal display device according to a second embodiment of the present invention will be described with reference to  FIG. 4 . For convenience of description, in this embodiment, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals. Therefore, the same components will be briefly described, or a description thereof will be omitted.  FIG. 4  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the second embodiment of the present invention. 
     Referring to  FIG. 4 , in the light source package according to this embodiment, the bottom plate flat portion  1410  is arranged substantially vertical to a light source mounting plate  1461 . That is, the light source mounting plate  1461  is formed by bending at least one end of the bottom plate flat portion  1410  such that an angle formed between the light source mounting plate  1461  and the bottom plate flat portion  1410  is 90°. In this case, light emitted from the light source  1100  according to this embodiment of the present invention can easily travel to the center of the light source package  1000  that is distant from the light source  1100 . 
     Next, a liquid crystal display device according to a third embodiment of the present invention will be described with reference to  FIG. 5 . For convenience of description, in this embodiment, the same components as those in the first or second embodiment of the present invention are denoted by the same reference numerals. Therefore, the same components will be briefly described, or a description thereof will be omitted.  FIG. 5  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the third embodiment of the present invention. 
     This embodiment is similar to the first and second embodiments of the present invention except for a package reflecting portion  1482 . In the light source package according to this embodiment, the light source mounting plate  1461  is arranged substantially vertical to the bottom plate flat portion  1410 . However, as shown in  FIG. 3A , the light source mounting plate  1461  may be formed so as to be inclined. Referring to  FIG. 5 , the package reflecting portion  1482  according to this embodiment includes a pair of light-reflective elements having a convex pattern. Said light-reflecting elements are formed at both sides of the bottom plate flat portion  1410  so as to be spaced from each other. 
     Next, a liquid crystal display device according to a fourth embodiment of the present invention will be described with reference to  FIG. 6 .  FIG. 6  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the fourth embodiment of the present invention. 
     This embodiment is similar to the third embodiment of the present invention except for a package reflecting portion  1483 . Referring to  FIG. 6 , the package reflecting portion  1483  according to this embodiment has a concave pattern that protrudes from the bottom plate flat portion  1410  to the outside of a package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ). The package reflecting portion  1483  according to this embodiment may be formed by bending the bottom plate flat portion  1410  downward in a concave shape. 
     Next, a liquid crystal display device according to a fifth embodiment of the present invention will be described with reference to  FIG. 7 .  FIG. 7  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the fifth embodiment of the present invention. 
     This embodiment is similar to the fourth embodiment of the present invention except for a package reflecting portion  1484 . Referring to  FIG. 7 , the package reflecting portion  1484  according to this embodiment includes a pair of light-reflecting elements having a convex pattern. Said light-reflecting elements are formed at both sides of the bottom plate flat portion  1410  so as to be spaced from each other. 
     Next, a liquid crystal display device according to a sixth embodiment of the present invention will be described with reference to  FIG. 8 .  FIG. 8  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the sixth embodiment of the present invention. 
     This embodiment is similar to the third embodiment of the present invention except for a package reflecting portion  1485 . Referring to  FIG. 8 , in this embodiment, the package reflecting portion  1485  is formed from a plurality of light-reflecting elements having the same size. The light-reflecting elements comprise a plurality of convex patterns. The package reflecting portion  1485  according to this embodiment is formed along the entire bottom plate  1485  of the light source package. 
     Next, a liquid crystal display device according to a seventh embodiment of the present invention will be described with reference to  FIG. 9 .  FIG. 9  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the seventh embodiment of the present invention. 
     This embodiment is similar to the third embodiment of the present invention except for a package reflecting portion  1486 . Referring to  FIG. 9 , in this embodiment, the package reflecting portion  1486  is formed from a plurality of light-reflecting elements having a convex pattern, such patterns having different sizes. The light-reflecting element provided at the center of the light source package has the largest size, and the size of the package reflecting portion is reduced as a distance from the center is increased. 
     Next, a liquid crystal display device according to an eighth embodiment of the present invention will be described with reference to  FIG. 10 .  FIG. 10  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the eighth embodiment of the present invention. 
     This embodiment is similar to the seventh embodiment of the present invention except for a package reflecting portion  1487 . The package reflecting portion  1487  consists of a plurality of light-reflecting elements that have a concave pattern, whereby the light-reflecting element provided at the center of the light source package has the largest size, and the sizes of the light-reflecting elements are reduced as their distance from the center of the light source package is increased. 
     Next, a liquid crystal display device according to a ninth embodiment of the present invention will be described with reference to  FIG. 11 .  FIG. 11  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the ninth embodiment of the present invention. 
     This embodiment is similar to the seventh embodiment of the present invention except for a package reflecting portion  1488 . The package reflecting portion  1488  consists of a plurality of light-reflecting elements having a convex pattern. According to this embodiment, the light-reflective elements have a cylindrical shape whereby the cylinder axis lies in the plane of the bottom plate flat portion  1410  and is perpendicular to the package sidewalls  1420 . Said light-reflecting elements are arranged such that the light-reflective element provided at the center of the light source package has the largest size, and the sizes of the light-reflecting elements are reduced as their distance from the center of the light source package is increased. 
     Next, a liquid crystal display device according to a tenth embodiment of the present invention will be described with reference to  FIG. 12 .  FIG. 12  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the tenth embodiment of the present invention. 
     This embodiment is similar to the first embodiment of the present invention except that this embodiment further includes a bead layer or a protective resin layer  1700  subjected to a surface treatment. Referring to  FIG. 12 , the bead layer or the protective resin layer  1700  subjected to a surface treatment is formed by laminating a bead layer made of, for example, transparent silicon on the upper surface of the protective resin  1600  or by subjecting the protective resin  1600  to a surface treatment to increase the roughness of the protective resin. In this way, it is possible to prevent light emitted from the light source package from being reflected back into the light source package due to total reflection, by further adjusting the emission angle of light from the light source package. As a result, it is possible to improve emission efficiency of the light source package. 
     Next, a liquid crystal display device according to an eleventh embodiment of the present invention will be described with reference to  FIG. 13 .  FIG. 13  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the eleventh embodiment of the present invention. 
     This embodiment is similar to the first embodiment of the present invention except for the arrangement of a fluorescent material  1610 . Referring to  FIG. 13 , the fluorescent material  1610  according to this embodiment is mixed with the resin  1500 . 
     Next, a liquid crystal display device according to a twelfth embodiment of the present invention will be described with reference to  FIG. 14 .  FIG. 14  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the twelfth embodiment of the present invention. 
     This embodiment is similar to the first embodiment of the present invention except for the arrangement of a fluorescent material  1611 . Referring to  FIG. 14 , the fluorescent material  1611  according to this embodiment is arranged so as to form a volume of limited size around the light source  1100 . 
     Next, a liquid crystal display device according to a thirteenth embodiment of the present invention will be described with reference to  FIG. 15 .  FIG. 15  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the thirteenth embodiment of the present invention. 
     This embodiment is similar to the first embodiment of the present invention except for the shape of the upper surface of the protective resin  1500  and the arrangement of a fluorescent material  1612 . According to this embodiment, the upper surface of the protective resin  1500  has a lens shape. The fluorescent material  1612  is placed only at an upper part of the protective resin  1500 . 
     Next, a liquid crystal display device according to a fourteenth embodiment of the present invention will be described with reference to  FIG. 16 .  FIG. 16  is a diagram schematically illustrating a light source package of the liquid crystal display device according to the fourteenth embodiment of the present invention. 
     The light source  1100  according to this embodiment is provided on a bottom plate flat portion  1410 . That is, a package case ( 1410  and  1420 ) according to this embodiment includes a bottom plate flat portion  1410  and a plurality of package side walls  1420  that are formed along the edge of the bottom plate flat portion  1410 , and the light source  1100  is mounted on the bottom plate flat portion  1410 , on the edge of the light source package. Therefore, the light source  1100  is not inclined with respect to the bottom plate  1410 . 
     The light source package according to this embodiment includes a package reflecting portion  1493  that is inclined with respect to the bottom plate  1410  and reflects light emitted from the light source  1100 . The package reflecting portion  1493  according to this embodiment is connected to the upper parts of a plurality of package side walls  1420  and is inclined with respect to the bottom plate flat portion  1410 . That is, the light source  1100  according to this embodiment is provided on the bottom plate flat portion  1410 , and light emitted from the light source  1100  to the upper surface of the light source package is reflected from the package reflecting portion  1493  to the center of the light source package. In this way, light is uniformly emitted from the entire emission surface of the light source package. Two or more light sources  1100  may be provided in one light source package. 
     As shown in  FIG. 1 , a plurality of light source packages  1000  according to this embodiment, are provided along at least one side of a light guide plate  130 . The ratio of the length of the light source package  1000  to a gap between the plurality of light source packages  1000  may be in a range of about 4:1 to about 30:1. 
     Next, the characteristics of the liquid crystal display devices according to the first to fourteenth embodiments of the present invention will be described with reference to  FIGS. 17 to 21B .  FIG. 17  is a diagram illustrating the gaps between the light source packages according to the embodiments of the present invention.  FIGS. 18A and 18B  are diagrams schematically illustrating the length of the light source package according to the embodiments of the present invention and the length of a light source package according to a comparative example.  FIGS. 19A and 19B  are diagrams schematically illustrating the brightness distribution of the light source package according to the embodiments of the present invention and the brightness distribution of the light source package according to the comparative example.  FIGS. 20A and 20B  are diagrams schematically illustrating the light quantity distribution of the light source package according to the embodiments of the present invention and the light quantity distribution of the light source package according to the comparative example.  FIGS. 21A and 21B  are diagrams schematically illustrating the area of a dark portion in the liquid crystal display device according to the embodiments of the present invention and the area of a dark portion in a liquid crystal display device according to the comparative example. 
     First, referring to  FIGS. 17 to 18B , a plurality of light source packages  1000  may be provided along at least one side of the light guide plate  130  (cf.  FIG. 1 ), and the ratio of the length L 1  of the light source package  1000  to a gap g 1  between the plurality of light source packages  1000  may be in a range of about 4:1 to about 30:1. Specifically, the length L 1  of the light source package  1000  may be in a range of about 20 to about 30 mm. When the length L 1  of the light source package  1000  is in the above-mentioned range, it is possible to drive the liquid crystal display device using a small number of light source packages  1000 , which results in a reduction in manufacturing costs. When the length L 1  of the light source package  1000  is larger than the above-mentioned range, it is difficult to emit uniform light from the entire surface of the light source package  1000 . When the length L 1  of the light source package  1000  is smaller than the above-mentioned range, a large number of light source packages  1000  need to be provided in the liquid crystal display device, and it is difficult to reduce manufacturing costs. In this embodiment, the length L 1  of the light source package  1000  is larger than the length L 2  of a light source package  1000 ′ according to the comparative example (cf.  FIGS. 18A and 18B ). Therefore, since a longer light source package  1000  is used to emit light to the liquid crystal display device, it is possible to reduce the area of a dark portion. In the comparative example depicted in  FIGS. 18B ,  19 B,  20 B, and  21 B, the light source package is provided on a bottom plate, and when the length L 2  of the light source package is large, the emission distribution of the light source package  1000 ′ is not uniform. Since the distance between the outer ends of two light source packages  1000 ′ according to the comparative example is the same as the length L 1  of the light source package  1000  according to this embodiment, the comparative example requires a large number of light source packages  1000  provided in the liquid crystal display device. The width W 1  of the light source package  1000  according to this embodiment may be equal to the width W 2  of the light source package  1000 ′ according to the comparative example. 
     The gap g 1  between the light source packages  1000  may be in a range of about 1 to about 5 mm. If the gap g 1  between the light source packages  1000  is smaller than the above-mentioned range, a large number of light source packages  1000  need to be provided in the liquid crystal display device increasing manufacturing costs. If the gap g 1  between the light source packages  1000  is larger than the above-mentioned range, the area of a dark portion is excessively large, and a brightness variation between different portions of the liquid crystal display device will be seen by a viewer. 
     Referring to  FIGS. 19A and 19B , as can be seen from  FIG. 19A  showing the light source package according to one of the embodiments of the present invention, in particular according to the embodiment depicted in  FIG. 4 , one light source package having a relatively large length has a uniform emission distribution. In contrast, as can be seen from  FIG. 19B  showing the light source packages according to the comparative example of  FIG. 18B , the light source packages, each having a relatively small length, have a uniform emission distribution, but a dark portion is formed in the gap between the light source packages. 
     Referring to  FIGS. 20A and 20B , as can be seen from  FIG. 20A  showing the light source package according to on of the embodiments of the present invention, in particular, the embodiment depicted in  FIG. 4 , one light source package having a relatively large length has a uniform emission distribution. In contrast, as can be seen from  FIG. 20B  showing the light source packages according to the comparative example depicted in  FIG. 18B , the light source packages, each having a relative small length, have a uniform light quantity distribution, but a dark portion is formed in the gap between the light source packages. 
     Referring to  FIGS. 21A and 21B , as can be seen from  FIG. 21A  showing the light source package according to the embodiments of the present invention, in particular, the embodiment depicted in  FIG. 4 , one light source package having a relatively large length has a uniform emission distribution, and no dark portion is formed in an area A. In contrast, as can be seen from  FIG. 21B  showing the light source packages according to the comparative example depicted in  FIG. 18B , a plurality of light source packages, each having a relative small length, are provided, and a dark portion is formed in the same area A as that in  FIG. 20A . 
     Next, a method of manufacturing a liquid crystal display device according to a fifteenth embodiment of the present invention will be described with reference to  FIG. 1  and  FIGS. 22A and 22B  to  28 .  FIGS. 22A and 22B  to  28  are diagrams illustrating processes of the method of manufacturing the liquid crystal display device according to the fifteenth embodiment of the present invention. 
     First, referring to  FIGS. 1 ,  22 A, and  22 B, two sets of lead frames  1210  and  1220  are provided. The lead frames  1210  and  1220  are coupled to the light source mounting plates (see reference numeral  1460  in  FIG. 23 ) at both ends of the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) and serve as electrodes of the light sources  1100 . 
     The lead frames  1210  and  1220  include a first lead frame  1210  which has a relatively large size and to which the light source  1100  is directly mounted, and a second lead frame  1220  which serves as an opposite electrode. The lead frames  1210  and  1220  include mounting portions  1210   a  and  1220   a  provided on the upper surface of the light source mounting plate, connecting portions  1210   b  and  1220   b  respectively formed by bending the mounting portions  1210   a  and  1220   a , and supporting portions  1210   c  and  1220   c  that are formed by bending the connecting portions  1210   b  and  1220   b  and are provided on the rear surface of the light source mounting plate. 
     The connecting portions  1210   b  and  1220   b  each have the same thickness as the light source mounting plate, and the mounting portions  1210   a  and  1220   a  and the supporting portions  1210   c  and  1220   c  are closely adhered to the upper and lower surfaces of the light source mounting plate, respectively. In this way, the lead frames  1210  and  1220  are coupled to the light source mounting plate. 
     Referring to  FIG. 23 , the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) including the package reflecting portion  1480  is provided. Before being coupled to the bottom plate flat portion  1410 , the light source mounting plates  1460  extend from both ends of the bottom plate flat portion  1410 , and the light source mounting plates and the bottom plate flat portion  1410  are positioned on the same plane. The connecting portions X between the light source mounting plates  1460  and the bottom plate flat portion  1410  have a small thickness such that the light source mounting plates  1460  can be easily bent with respect to the bottom plate flat portion  1410 . The package side walls ( 1420  and  1470 ) include the vertical side walls  1420  that are provided along both sides of the bottom plate flat portion  1410  and face each other, and the connection side walls  1470  that are provided along both sides of the light source mounting plate  1460  and also face each other. The engaging grooves  1420   a  and the protruding portions  1470   a  are formed in the vertical side walls  1420  and the connection side walls  1470 , respectively. 
     The package reflecting portion  1480  may be formed by bending the bottom plate flat portion  1410 , or a separate reflecting member may be provided on the bottom plate ( 1410  and  1480 ) so as to be inclined with respect to the bottom plate flat portion  1410 . 
     Referring to  FIG. 24 , the light source mounting plates  1460  positioned on the same plane as the bottom plate flat portion  1410  are coupled to the lead frames  1210  and  1220 , and each light source  1100  is mounted on the lead frames  1210  and  1220 . Each of the light sources  1100  is connected to the lead frames  1210  and  1220  by wires  1310  and  1320 , respectively. 
     Then, referring to  FIG. 25 , the light source mounting plates  1460  are bent to couple the connection side walls  1470  to the vertical side walls  1420 . That is, the protruding portions  1470   a  formed on the connection side walls  1470  are fitted into the engaging grooves  1420   a  formed in the vertical side walls  1420 , thereby forming the package side walls ( 1420  and  1470 ). 
     The above-mentioned processes provide the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) including the bottom plate flat portion  1410  and the light source mounting plate  1460  that is formed by bending at least one end of the bottom plate ( 1410  and  1480 ) and has the first inclination angle θ 1  with respect to the bottom plate flat portion  1410 , and the package reflecting portion  1480  that is provided in the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ) so as to have the second inclination angle −θ 2  with respect to the bottom plate flat portion  1410 . 
     Then, referring to  FIG. 26 , the protective resin  1500  is filled in the package case ( 1410 ,  1420 ,  1460 ,  1470 , and  1480 ), and the fluorescent material  1600  is mixed with the protective resin. This embodiment may further comprise a process of forming a bead layer or a protective resin layer(see  FIG. 12 ) subjected to a surface treatment on the protective resin  1500 . 
     Then, referring to  FIGS. 22A ,  22 B, and  27 , the light source packages  1000  are arranged on the alignment plate  120  such that the lead frames  1210  and  1220  contact the external power supply terminals  121  of the alignment plate  120 . 
     Then, referring to  FIG. 28 , a plurality of light source packages  1000  are arranged along at least one side of the light guide plate  130 . In this case, the ratio of the length of the light source package  1000  to the gap between the plurality of light source packages  1000  arranged on the alignment plate  120  may be in a range of about 4:1 to about 30:1. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein, without departing from the spirit and scope of the present invention as defined by the following claims.