Patent Publication Number: US-9837388-B2

Title: Display device using semiconductor light emitting device

Description:
CROSS REFERENCE TO THE RELATED APPLICATIONS 
     This application is the National Phase of PCT/KR2014/002575 filed on Mar. 26, 2014, which claims priority under 35 U.S.C. §119(a) to Korean Patent Application No. 10-2013-0098315 filed in the Republic of Korea on Aug. 20, 2013, all of which are hereby expressly incorporated by reference into the present application. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present disclosure relates to a display device, and more particularly, to a display device using a semiconductor light emitting device. 
     Description of the Related Art 
     In recent years, display devices having excellent characteristics such as low profile, flexibility and the like have been developed in the display technical field. On the contrary, currently commercialized main displays are represented by liquid crystal displays (LCDs) and active matrix organic light emitting diodes (AMOLEDs). 
     However, there exist problems such as not-so-fast response time, difficult implementation of flexibility in case of LCDs, and there exist drawbacks such as short life span, not-so-good yield as well as low flexibility in case of AMOLEDs. 
     On the other hand, light emitting diodes (LEDs) are well known light emitting devices for converting an electrical current to light, and have been used as a light source for displaying an image in an electronic device including information communication devices since red LEDs using GaAsP compound semiconductors were made commercially available in 1962, together with a GaP:N-based green LEDs. Accordingly, the semiconductor light emitting devices may be used to implement a flexible display, thereby presenting a scheme for solving the problems. 
     SUMMARY OF THE INVENTION 
     An aspect of the present disclosure is to provide a new type of display device with flexibility, which is different from the related art. 
     Another aspect of the present disclosure is to provide a display device having long life span, low power consumption, high efficiency and fast response time. 
     A display device according to an embodiment of the present disclosure may include a lower substrate disposed with a line electrode at an upper portion thereof, a plurality of semiconductor light emitting devices electrically connected to the line electrode to generate light, a wavelength converter disposed on the semiconductor light emitting device to convert a wavelength of light generated from the semiconductor light emitting device, and a conductive adhesive layer comprising conductors configured to electrically connect the lower substrate to the semiconductor light emitting device and a body configured to surround the conductors, wherein the semiconductor light emitting device has a composition formula of In x Al y Ga 1-x-y N (0≦x≦1, 1≦y≦1, 0≦x+y≦1). 
     Here, the semiconductor light emitting device may include a first conductive semiconductor layer, an active layer located on the first conductive semiconductor layer, and a second conductive semiconductor layer located on the active layer, wherein the semiconductor light emitting device emits an ultraviolet ray (UV) region of light. 
     Furthermore, the first and the second conductive electrode may be in contact with the conductors. 
     On the other hand, the body of the conductive adhesive layer may be disposed to surround a lateral surface and a lower surface of the semiconductor light emitting device. 
     Furthermore, the body of the conductive adhesive layer may contain a material for blocking UV light. 
     On the other hand, the wavelength converter may be disposed at a black matrix for partitioning a pixel region, and in the pixel region partitioned by the black matrix. 
     Furthermore, the wavelength converter may contain a phosphor for converting a wavelength of light. 
     Furthermore, the present disclosure may include a lower substrate disposed with a line electrode at an upper portion thereof, a plurality of semiconductor light emitting devices electrically connected to the line electrode to generate light, a color substrate disposed on the semiconductor light emitting device to convert a wavelength of light generated from the semiconductor light emitting device, and a conductive adhesive layer comprising conductors configured to electrically connected to the lower substrate to the semiconductor light emitting device and a body configured to surround the conductors, wherein the semiconductor light emitting device emits an ultraviolet ray (UV) region of light, and the body of the conductive adhesive layer contains a material for blocking UV light. 
     According to the present disclosure having the foregoing configuration, a distance between light emitting devices may be sufficiently large and the conductive adhesive layer may have softness, thereby implementing a rollable display device. 
     According to an embodiment, an inorganic semiconductor light emitting device may be disposed in a pixel region, thereby having an advantage capable of implementing a high-speed screen with a fast response time. 
     Furthermore, according to an embodiment, an additional back light may be not required, thereby having an advantage of excellent luminance and excellent efficiency. 
     Furthermore, the semiconductor light emitting device may be an inorganic material, thereby having an advantage of long life span. 
     Furthermore, according to an embodiment, the semiconductor light emitting device may be disposed in a pixel unit, thereby having an advantage of being implemented easily with an active type. 
     Furthermore, a first conductive electrode and a second electrode may be located in a lower region of the active layer for generating light, thereby preventing light from being absorbed. 
     Furthermore, the conductive adhesive layer may block ultraviolet rays, thereby suppressing optical interference between pixel regions. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a conceptual view illustrating a display device using a semiconductor light emitting device according to an embodiment of the present disclosure; 
         FIG. 2  is a partial enlarged view of portion “A” in  FIG. 1 , and  FIGS. 3A and 3B  are cross-sectional views taken along lines B-B and C-C in  FIG. 2 ; 
         FIG. 4  is a conceptual view illustrating a flip-chip type semiconductor light emitting device in  FIG. 3A ; 
         FIGS. 5A through 5C  are conceptual views illustrating various forms for implementing colors in connection with a flip-chip type semiconductor light emitting device; 
         FIG. 6  is cross-sectional views illustrating a method of fabricating a display device using a semiconductor light emitting device according to the present disclosure; 
         FIG. 7  is a perspective view illustrating a display device using a semiconductor light emitting device according to another embodiment of the present disclosure; 
         FIG. 8  is a cross-sectional view taken along line C-C in  FIG. 7 ; 
         FIG. 9  is a conceptual view illustrating a vertical type semiconductor light emitting device in  FIG. 8 ; 
         FIG. 10  is a partial cross-sectional view illustrating a display device according to an embodiment of the present disclosure; 
         FIG. 11  is a plan view illustrating a display device according to an embodiment of  FIG. 10 ; 
         FIG. 12  is a cross-sectional view illustrating a semiconductor light emitting device in  FIG. 10 ; and 
         FIGS. 13 through 17  are a flow chart illustrating a method of fabricating a display device according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Advantages and features of the present disclosure, and methods of accomplishing the same will be clearly understood with reference to the following embodiments described in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to those embodiments disclosed below but may be implemented in various different forms. It should be noted that the present embodiments are merely provided to make a full disclosure of the invention and also to allow those skilled in the art to know the full range of the invention, and therefore, the present invention is to be defined only by the scope of the appended claims. Further, like reference numerals refer to like or similar elements throughout the specification. 
     Spatially relative terms such as “below”, “beneath”, “lower”, “above”, or “upper” may be used herein to describe a correlation between one device or constituent element and other devices or constituent elements as illustrated in the drawings. It will be understood that spatially relative terms are intended to include a different direction of device during the use or operation in addition to its direction illustrated in the drawings. For example, when a device in the drawing is turned over, the device described as “below” or “beneath” another device will be placed “above” the another device. Accordingly, the exemplary terms “below” or “beneath” may include both directions of above and below. Since the device may be oriented in another direction, and thus the spatially relative terms may be interpreted in accordance with the orientation thereof. 
     It should be noted that the terms used herein are merely used to describe the embodiments, but not to limit the present invention. In the present specification, unless clearly used otherwise, expressions in a singular form include a plural form. The term “comprises” and/or “comprising” used in the specification intend to express a constituent element, a step, an operation and/or a device does not exclude the existence or addition of one or more other constituent elements, steps, operations and/or devices. 
     In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for the convenience and clarity of the description. Furthermore, the size or area of each constituent element does not definitely reflect the actual size or area thereof. 
     Furthermore, angles or directions used to describe the structure of a display device according to an embodiment are based on those shown in the drawings. Unless a reference point or positional relation with respect to an angle is not clearly defined in describing a structure for implementing the display device in the specification, the associated drawings may be referred to. 
     Hereinafter, the embodiments disclosed herein will be described in detail with reference to the accompanying drawings, and the same or similar elements are designated with the same numeral references regardless of the numerals in the drawings and their redundant description will be omitted. A suffix “module” or “unit” used for constituent elements disclosed in the following description is merely intended for easy description of the specification, and the suffix itself does not give any special meaning or function. In describing the embodiments disclosed herein, moreover, the detailed description will be omitted when a specific description for publicly known technologies to which the invention pertains is judged to obscure the gist of the present invention. Also, it should be noted that the accompanying drawings are merely illustrated to easily explain the concept of the invention, and therefore, they should not be construed to limit the technological concept disclosed herein by the accompanying drawings. 
     Furthermore, it will be understood that when an element such as a layer, region or substrate is referred to as being “on” another element, it can be directly on the another element or an intermediate element may also be interposed therebetween. 
     A display device disclosed herein may include a portable phone, a smart phone, a laptop computer, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation, a slate PC, a tablet PC, an ultrabook, a digital TV, a desktop computer, and the like. However, it would be easily understood by those skilled in the art that a configuration disclosed herein may be applicable to any displayable device even though it is a new product type which will be developed later. 
       FIG. 1  is a conceptual view illustrating a display device using a semiconductor light emitting device according to an embodiment of the present disclosure. 
     According to the drawing, information processed in the controller of the display device  100  may be displayed using a flexible display. 
     The flexible display may include a flexible, bendable, twistable, foldable and rollable display. For example, the flexible display may be a display fabricated on a thin and flexible substrate that can be warped, bent, folded or rolled like a paper sheet while maintaining the display characteristics of a flat display in the related art. 
     A display area of the flexible display becomes a plane in a configuration that the flexible display is not warped (for example, a configuration having an infinite radius of curvature, hereinafter, referred to as a “first configuration”). The display area thereof becomes a curved surface in a configuration that the flexible display is warped by an external force in the first configuration (for example, a configuration having a finite radius of curvature, hereinafter, referred to as a “second configuration”). As illustrated in the drawing, information displayed in the second configuration may be visual information displayed on a curved surface. The visual information may be implemented by individually controlling the light emission of sub-pixels disposed in a matrix form. The sub-pixel denotes a minimum unit for implementing one color. 
     The sub-pixel of the flexible display may be implemented by a semiconductor light emitting device. According to the present disclosure, a light emitting diode (LED) is illustrated as a type of semiconductor light emitting device. The light emitting diode may be formed with a small size to perform the role of a sub-pixel even in the second configuration through this. 
     Hereinafter, a flexible display implemented using the light emitting diode will be described in more detail with reference to the accompanying drawings. 
       FIG. 2  is a partial enlarged view of portion “A” in  FIG. 1 , and  FIGS. 3A and 3B  are cross-sectional views taken along lines B-B and C-C in  FIG. 2 ,  FIG. 4  is a conceptual view illustrating a flip-chip type semiconductor light emitting device in  FIG. 3A , and  FIGS. 5A through 5C  are conceptual views illustrating various forms for implementing colors in connection with a flip-chip type semiconductor light emitting device. 
     According to the drawings in  FIGS. 2, 3A and 3B , there is illustrated a display device  100  using a passive matrix (PM) type semiconductor light emitting device as a display device  100  using a semiconductor light emitting device. However, the following illustration may be also applicable to an active matrix (AM) type semiconductor light emitting device. 
     The display device  100  may include a substrate  110 , a first electrode  120 , a conductive adhesive layer  130 , a second electrode  140 , and a plurality of semiconductor light emitting devices  150 . 
     The substrate  110  may be a flexible substrate. The substrate  110  may contain glass or polyimide (PI) to implement the flexible display device. In addition, if it is a flexible material, any one such as polyethylene naphthalate (PEN), polyethylene terephthalate (PET) or the like may be used. Furthermore, the substrate  110  may be either one of transparent and non-transparent materials. 
     The substrate  110  may be a wiring substrate disposed with the first electrode  120 , and thus the first electrode  120  may be placed on the substrate  110 . 
     According to the drawing, an insulating layer  160  may be disposed on the substrate  110  placed with the first electrode  120 , and an auxiliary electrode  170  may be placed on the insulating layer  160 . In this case, a configuration in which the insulating layer  160  is deposited on the substrate  110  may be single wiring substrate. More specifically, the insulating layer  160  may be incorporated into the substrate  110  with an insulating and flexible material such as polyimide (PI), PET, PEN or the like to form single wiring substrate. 
     The auxiliary electrode  170  as an electrode for electrically connecting the first electrode  120  to the semiconductor light emitting device  150  is placed on the insulating layer  160 , and disposed to correspond to the location of the first electrode  120 . For example, the auxiliary electrode  170  has a dot shape, and may be electrically connected to the first electrode  120  by means of an electrode hole  171  passing through the insulating layer  160 . The electrode hole  171  may be formed by filling a conductive material in a via hole. 
     Referring to the drawings, the conductive adhesive layer  130  may be formed on one surface of the insulating layer  160 , but the present disclosure may not be necessarily limited to this. For example, it may be possible to also have a structure in which the conductive adhesive layer  130  is disposed on the substrate  110  with no insulating layer  160 . The conductive adhesive layer  130  may perform the role of an insulating layer in the structure in which the conductive adhesive layer  130  is disposed on the substrate  110 . 
     The conductive adhesive layer  130  may be a layer having adhesiveness and conductivity, and to this end, a conductive material and an adhesive material may be mixed on the conductive adhesive layer  130 . Furthermore, the conductive adhesive layer  130  may have flexibility, thereby allowing a flexible function in the display device. 
     For such an example, the conductive adhesive layer  130  may be an anisotropic conductive film (ACF), an anisotropic conductive paste, a solution containing conductive particles, and the like. The conductive adhesive layer  130  may allow electrical interconnection in the z-direction passing through the thickness thereof, but may be configured as a layer having electrical insulation in the horizontal x-y direction thereof. Accordingly, the conductive adhesive layer  130  may be referred to as a z-axis conductive layer (however, hereinafter referred to as a “conductive adhesive layer”). 
     The anisotropic conductive film is a film with a form in which an anisotropic conductive medium is mixed with an insulating base member, and thus when heat and pressure are applied thereto, only a specific portion thereof may have conductivity by means of the anisotropic conductive medium. Hereinafter, heat and pressure are applied to the anisotropic conductive film, but other methods may be also available for the anisotropic conductive film to partially have conductivity. The methods may include applying only either one of heat and pressure thereto, UV curing, and the like. 
     Furthermore, the anisotropic conductive medium may be conductive balls or particles. According to the drawing, in the present embodiment, the anisotropic conductive film is a film with a form in which an anisotropic conductive medium is mixed with an insulating base member, and thus when heat and pressure are applied thereto, only a specific portion thereof may have conductivity by means of the conductive balls. The anisotropic conductive film may be in a state in which a core with a conductive material contains a plurality of particles coated by an insulating layer with a polymer material, and in this case, it may have conductivity by means of the core while breaking an insulating layer on a portion to which heat and pressure are applied. Here, a core may be transformed to implement a layer having both surfaces to which objects contact in the thickness direction of the film. For a more specific example, heat and pressure are applied to an anisotropic conductive film as a whole, and electrical connection in the z-axis direction is partially formed by a height difference from a mating object adhered by the use of the anisotropic conductive film. 
     For another example, an anisotropic conductive film may be in a state containing a plurality of particles in which a conductive material is coated on insulating cores. In this case, a portion to which heat and pressure are applied may be converted (pressed and adhered) to a conductive material to have conductivity in the thickness direction of the film. For still another example, it may be formed to have conductivity in the thickness direction of the film in which a conductive material passes through an insulating base member in the z-direction. In this case, the conductive material may have a pointed end portion. 
     According to the drawing, the anisotropic conductive film may be a fixed array anisotropic conductive film (ACF) configured with a form in which conductive balls are inserted into one surface of the insulating base member. More specifically, the insulating base member is formed of an adhesive material, and the conductive balls are intensively disposed at a bottom portion of the insulating base member, and when heat and pressure are applied thereto, the base member is modified along with the conductive balls, thereby having conductivity in the vertical direction thereof. 
     However, the present disclosure may not be necessarily limited to this, and the anisotropic conductive film may be all allowed to have a form in which conductive balls are randomly mixed with an insulating base member or a form configured with a plurality of layers in which conductive balls are disposed at any one layer (double-ACF), and the like. 
     The anisotropic conductive paste as a form coupled to a paste and conductive balls may be a paste in which conductive balls are mixed with an insulating and adhesive base material. Furthermore, a solution containing conductive particles may be a solution in a form containing conductive particles or nano particles. 
     Referring to the drawing again, the second electrode  140  is located at the insulating layer  160  to be separated from the auxiliary electrode  170 . In other words, the conductive adhesive layer  130  is disposed on the insulating layer  160  located with the auxiliary electrode  170  and second electrode  140 . 
     When the conductive adhesive layer  130  is formed in a state that the auxiliary electrode  170  and second electrode  140  are located, and then the semiconductor light emitting device  150  is connect thereto in a flip chip form with the application of heat and pressure, the semiconductor light emitting device  150  is electrically connected to the first electrode  120  and second electrode  140 . 
     Referring to  FIG. 4 , the semiconductor light emitting device  150  may be a flip chip type semiconductor light emitting device. 
     For example, the semiconductor light emitting device may include a p-type electrode  156 , a p-type semiconductor layer  155  formed with the p-type electrode  156 , an active layer  154  formed on the p-type semiconductor layer  155 , an n-type semiconductor layer  153  formed on the active layer  154 , and an n-type electrode  152  disposed to be separated from the p-type electrode  156  in the horizontal direction on the n-type semiconductor layer  153 . In this case, the p-type electrode  156  may be electrically connected to the welding portion by the conductive adhesive layer  130 , and the n-type electrode  152  may be electrically connected to the second electrode  140 . 
     Referring to  FIGS. 2, 3A and 3B  again, the auxiliary electrode  170  may be formed in an elongated manner in one direction to be electrically connected to a plurality of semiconductor light emitting devices  150 . For example, the left and right p-type electrodes of the semiconductor light emitting devices around the auxiliary electrode may be electrically connected to one auxiliary electrode. 
     More specifically, the semiconductor light emitting device  150  is pressed into the conductive adhesive layer  130 , and through this, only a portion between the p-type electrode  156  and auxiliary electrode  170  of the semiconductor light emitting device  150  and a portion between the n-type electrode  152  and second electrode  140  of the semiconductor light emitting device  150  have conductivity, and the remaining portion does not have conductivity since there is no push-down of the semiconductor light emitting device. 
     Furthermore, a plurality of semiconductor light emitting devices  150  constitute a light-emitting array, and a phosphor layer  180  is formed on the light-emitting array. 
     The light emitting device may include a plurality of semiconductor light emitting devices with different self luminance values. Each of the semiconductor light emitting devices  150  constitutes a sub-pixel, and is electrically connected to the first electrode  120 . For example, there may exist a plurality of first electrodes  120 , and the semiconductor light emitting devices are arranged in several rows, for instance, and each row of the semiconductor light emitting devices may be electrically connected to any one of the plurality of first electrodes. 
     Furthermore, the semiconductor light emitting devices may be connected in a flip chip fonn, and thus semiconductor light emitting devices grown on a transparent dielectric substrate. Furthermore, the semiconductor light emitting devices may be nitride semiconductor light emitting devices, for instance. The semiconductor light emitting device  150  has an excellent luminance characteristic, and thus it may be possible to configure individual sub-pixels even with a small size thereof. 
     According to the drawing, a partition wall  190  may be formed between the semiconductor light emitting devices  150 . In this case, the partition wall  190  may perform the role of dividing individual sub-pixels from one another, and be formed as an integral body with the conductive adhesive layer  130 . For example, a base member of the anisotropic conductive film may form the partition wall when the semiconductor light emitting device  150  is inserted into the anisotropic conductive film. 
     Furthermore, when the base member of the anisotropic conductive film is black, the partition wall  190  may have reflective characteristics while at the same time increasing contrast with no additional black insulator. 
     For another example, a reflective partition wall may be separately provided with the partition wall  190 . In this case, the partition wall  190  may include a black or white insulator according to the purpose of the display device. It may have an effect of enhancing reflectivity when the partition wall of the while insulator is used, and increase contrast while at the same time having reflective characteristics. 
     The phosphor layer  180  may be located at an outer surface of the semiconductor light emitting device  150 . For example, the semiconductor light emitting device  150  is a blue semiconductor light emitting device that emits blue (B) light, and the phosphor layer  180  performs the role of converting the blue (B) light into the color of a sub-pixel. The phosphor layer  180  may be a red phosphor layer  181  or green phosphor layer  182  constituting individual pixels. 
     In other words, a red phosphor  181  capable of converting blue light into red (R) light may be deposited on the blue semiconductor light emitting device  151  at a location implementing a red sub-pixel, and a green phosphor  182  capable of converting blue light into green (G) light may be deposited on the blue semiconductor light emitting device  151  at a location implementing a green sub-pixel. Furthermore, only the blue semiconductor light emitting device  151  may be solely used at a location implementing a blue sub-pixel. In this case, the red (R), green (G) and blue (B) sub-pixels may implement one pixel. More specifically, one color phosphor may be deposited along each line of the first electrode  120 . Accordingly, one line on the first electrode  120  may be an electrode controlling one color. In other words, red (R), green (B) and blue (B) may be sequentially disposed, thereby implementing sub-pixels. 
     However, the present disclosure may not be necessarily limited to this, and the semiconductor light emitting device  150  may be combined with a quantum dot (QD) instead of a phosphor to implement sub-pixels such as red (R), green (G) and blue (B). 
     Furthermore, a black matrix  191  may be disposed between each phosphor layer to enhance contrast. In other words, the black matrix  191  can enhance the contrast of luminance. 
     However, the present disclosure may not be necessarily limited to this, and another structure for implementing blue, red and green may be also applicable thereto. 
     Referring to  FIG. 5A , each of the semiconductor light emitting devices  150  may be implemented with a high-power light emitting device that emits various lights including blue in which gallium nitride (GaN) is mostly used, and indium (In) and or aluminum (Al) are added thereto. 
     In this case, the semiconductor light emitting device  150  may be red, green and blue semiconductor light emitting devices, respectively, to implement each sub-pixel. For instance, red, green and blue semiconductor light emitting devices (R, G, B) are alternately disposed, and red, green and blue sub-pixels implement one pixel by means of the red, green and blue semiconductor light emitting devices, thereby implementing a full color display. 
     Referring to  FIG. 5B , the semiconductor light emitting device may have a white light emitting device (W) provided with a yellow phosphor layer for each element. In this case, a red phosphor layer  181 , a green phosphor layer  182  and blue phosphor layer  183  may be provided on the white light emitting device (W) to implement a sub-pixel. Furthermore, a color filter repeated with red, green and blue on the white light emitting device (W) may be used to implement a sub-pixel. 
     Referring to  FIG. 5C , it may be possible to also have a structure in which a red phosphor layer  181 , a green phosphor layer  182  and blue phosphor layer  183  may be provided on a ultraviolet light emitting device (UV). In this manner, the semiconductor light emitting device can be used over the entire region up to ultraviolet (UV) as well as visible light, and may be extended to a form of semiconductor light emitting device in which ultraviolet (UV) can be used as an excitation source. 
     Taking the present example into consideration again, the semiconductor light emitting device  150  is placed on the conductive adhesive layer  130  to configure a subpixel in the display device. The semiconductor light emitting device  150  may have excellent luminance characteristics, and thus it may be possible to configure individual sub-pixels even with a small size thereof. The size of the individual semiconductor light emitting device  150  may be less than 80 μm in the length of one side thereof, and formed with a rectangular or square shaped element. In case of a rectangular shaped element, the size thereof may be less than 20×80 μm. 
     Furthermore, even when a square shaped semiconductor light emitting device  150  with a length of side of 10 μm is used for a sub-pixel, it will exhibit a sufficient brightness for implementing a display device. Accordingly, for example, in case of a rectangular pixel in which one side of a sub-pixel is 600 μm in size, and the remaining one side thereof is 300 μm, a relative distance between the semiconductor light emitting devices becomes sufficiently large. Accordingly, in this case, it may be possible to implement a flexible display device having a HD image quality. 
     A display device using the foregoing semiconductor light emitting device will be fabricated by a new type of fabrication method. Hereinafter, the fabrication method will be described with reference to  FIG. 6 . 
       FIG. 6  is cross-sectional views illustrating a method of fabricating a display device using a semiconductor light emitting device according to the present disclosure. 
     Referring to the drawing, first, the conductive adhesive layer  130  is formed on the insulating layer  160  located with the auxiliary electrode  170  and second electrode  140 . The insulating layer  160  is deposited on the first substrate  110  to form one substrate (or wiring substrate), and the first electrode  120 , auxiliary electrode  170  and second electrode  140  are disposed at the wiring substrate. In this case, the first electrode  120  and second electrode  140  may be disposed in a perpendicular direction to each other. Furthermore, the first substrate  110  and insulating layer  160  may contain glass or polyimide (PI), respectively, to implement a flexible display device. 
     The conductive adhesive layer  130  may be implemented by an anisotropic conductive film, for example, and to this end, an anisotropic conductive film may be coated on a substrate located with the insulating layer  160 . 
     Next, a second substrate  112  located with a plurality of semiconductor light emitting devices  150  corresponding to the location of the auxiliary electrodes  170  and second electrodes  140  and constituting individual pixels is disposed such that the semiconductor light emitting device  150  faces the auxiliary electrode  170  and second electrode  140 . 
     In this case, the second substrate  112  as a growth substrate for growing the semiconductor light emitting device  150  may be a sapphire substrate or silicon substrate. 
     The semiconductor light emitting device may have a gap and size capable of implementing a display device when formed in the unit of wafer, and thus effectively used for a display device. 
     Next, the wiring substrate is thermally compressed to the second substrate  112 . For example, the wiring substrate and second substrate  112  may be thermally compressed to each other by applying an ACF press head. The wiring substrate and second substrate  112  are bonded to each other using the thermal compression. Only a portion between the semiconductor light emitting device  150  and the auxiliary electrode  170  and second electrode  140  may have conductivity due to the characteristics of an anisotropic conductive film having conductivity by thermal compression, thereby allowing the electrodes and semiconductor light emitting device  150  to be electrically connected to each other. At this time, the semiconductor light emitting device  150  may be inserted into the anisotropic conductive film, thereby forming a partition wall between the semiconductor light emitting devices  150 . 
     Next, the second substrate  112  is removed. For example, the second substrate  112  may be removed using a laser lift-off (LLO) or chemical lift-off (CLO) method. 
     Finally, the second substrate  112  is removed to expose the semiconductor light emitting devices  150  to the outside. Silicon oxide (SiOx) or the like may be coated on the wiring substrate coupled to the semiconductor light emitting device  150  to form a transparent insulating layer (not shown). 
     Furthermore, it may further include the process of forming a phosphor layer on one surface of the semiconductor light emitting device  150 . For example, the semiconductor light emitting device  150  may be a blue semiconductor light emitting device for emitting blue (B) light, and red or green phosphor for converting the blue (B) light into the color of the sub-pixel may form a layer on one surface of the blue semiconductor light emitting device. 
     The fabrication method or structure of a display device using the foregoing semiconductor light emitting device may be modified in various forms. For such an example, the foregoing display device may be applicable to a vertical semiconductor light emitting device. Hereinafter, the vertical structure will be described with reference to  FIGS. 5 and 6 . 
     Furthermore, according to the following modified example or embodiment, the same or similar reference numerals are designated to the same or similar configurations to the foregoing example, and the description thereof will be substituted by the earlier description. 
       FIG. 7  is a perspective view illustrating a display device using a semiconductor light emitting device according to another embodiment of the present disclosure.  FIG. 8  is a cross-sectional view taken along line C-C in  FIG. 7 , and  FIG. 9  is a conceptual view illustrating a vertical type semiconductor light emitting device in  FIG. 8 . 
     According to the drawings, the display device may be display device using a passive matrix (PM) type of vertical semiconductor light emitting device. 
     The display device may include a substrate  210 , a first electrode  220 , a conductive adhesive layer  230 , a second electrode  240  and a plurality of semiconductor light emitting devices  250 . 
     The substrate  210  as a wiring substrate disposed with the first electrode  220  may include polyimide (PI) to implement a flexible display device. In addition, any one may be used if it is an insulating and flexible material. 
     The first electrode  220  may be located on the substrate  210 , and formed with an electrode having a bar elongated in one direction. The first electrode  220  may be formed to perform the role of a data electrode. 
     The conductive adhesive layer  230  is formed on the substrate  210  located with the first electrode  220 . Similarly to a display device to which a flip chip type light emitting device is applied, the conductive adhesive layer  230  may be an anisotropic conductive film (ACF), an anisotropic conductive paste, a solution containing conductive particles, and the like. However, the present embodiment illustrates a case where the conductive adhesive layer  230  is implemented by an anisotropic conductive film. 
     When an anisotropic conductive film is located in a state that the first electrode  220  is located on the substrate  210 , and then heat and pressure are applied to connect the semiconductor light emitting device  250  thereto, the semiconductor light emitting device  250  is electrically connected to the first electrode  220 . At this time, the semiconductor light emitting device  250  may be preferably disposed on the first electrode  220 . 
     The electrical connection is generated because an anisotropic conductive film partially has conductivity in the thickness direction when heat and pressure are applied as described above. Accordingly, the anisotropic conductive film is partitioned into a portion  231  having conductivity and a portion  232  having no conductivity in the thickness direction thereof. 
     Furthermore, the anisotropic conductive film contains an adhesive component, and thus the conductive adhesive layer  230  implements a mechanical coupling as well as an electrical coupling between the semiconductor light emitting device  250  and the first electrode  220 . 
     In this manner, the semiconductor light emitting device  250  is placed on the conductive adhesive layer  230 , thereby configuring a separate sub-pixel in the display device. The semiconductor light emitting device  250  may have excellent luminance characteristics, and thus it may be possible to configure individual sub-pixels even with a small size thereof. The size of the individual semiconductor light emitting device  250  may be less than 80 μm in the length of one side thereof, and formed with a rectangular or square shaped element. In case of a rectangular shaped element, the size thereof may be less than 20×80 μm. 
     The semiconductor light emitting device  250  may be a vertical structure. 
     A plurality of second electrodes  240  disposed in a direction crossed with the length direction of the first electrode  220 , and electrically connected to the vertical semiconductor light emitting device  250  may be located between vertical semiconductor light emitting devices. 
     Referring to  FIG. 9 , the vertical semiconductor light emitting device may include a p-type electrode  256 , a p-type semiconductor layer  255  formed with the p-type electrode  256 , an active layer  254  formed on the p-type semiconductor layer  255 , an n-type semiconductor layer  253  formed on the active layer  254 , and an n-type electrode  252  formed on the n-type semiconductor layer  253 . In this case, the p-type electrode  256  located at the bottom thereof may be electrically connected to the first electrode  220  by the conductive adhesive layer  230 , and the n-type electrode  252  located at the top thereof may be electrically connected to the second electrode  240  which will be described later. The electrodes may be disposed in the upward/downward direction in the vertical semiconductor light emitting device  250 , thereby providing a great advantage capable of reducing the chip size. 
     Referring to  FIG. 8  again, a phosphor layer  280  may be formed on one surface of the semiconductor light emitting device  250 . For example, the semiconductor light emitting device  250  is a blue semiconductor light emitting device  251  that emits blue (B) light, and the phosphor layer  280  for converting the blue (B) light into the color of the sub-pixel may be provided thereon. In this case, the phosphor layer  280  may be a red phosphor  281  and a green phosphor  282  constituting individual pixels. 
     In other words, a red phosphor  281  capable of converting blue light into red (R) light may be deposited on the blue semiconductor light emitting device  250  at a location implementing a red sub-pixel, and a green phosphor  282  capable of converting blue light into green (G) light may be deposited on the blue semiconductor light emitting device  250  at a location implementing a green sub-pixel. Furthermore, only the blue semiconductor light emitting device  250  may be solely used at a location implementing a blue sub-pixel. In this case, the red (R), green (G) and blue (B) sub-pixels may implement one pixel. 
     However, the present disclosure may not be necessarily limited to this, and another structure for implementing blue, red and green may be also applicable thereto as described above in a display device to which a flip chip type light emitting device is applied. 
     Taking the present embodiment into consideration again, the second electrode  240  is located between the semiconductor light emitting devices  250 , and electrically connected to the semiconductor light emitting devices  250 . For example, the semiconductor light emitting devices  250  may be disposed in a plurality of rows, and the second electrode  240  may be located between the rows of the semiconductor light emitting devices  250 . 
     Since a distance between the semiconductor light emitting devices  250  constituting individual pixels is sufficiently large, the second electrode  240  may be located between the semiconductor light emitting devices  250 . 
     The second electrode  240  may be formed with an electrode having a bar elongated in one direction, and disposed in a perpendicular direction to the first electrode. 
     Furthermore, the second electrode  240  may be electrically connected to the semiconductor light emitting device  250  by a connecting electrode protruded from the second electrode  240 . More specifically, the connecting electrode may be an n-type electrode of the semiconductor light emitting device  250 . For example, the n-type electrode is formed with an ohmic electrode for ohmic contact, and the second electrode covers at least part of the ohmic electrode by printing or deposition. Through this, the second electrode  240  may be electrically connected to the n-type electrode of the semiconductor light emitting device  250 . 
     According to the drawing, the second electrode  240  may be located on the conductive adhesive layer  230 . According to circumstances, a transparent insulating layer (not shown) containing silicon oxide (SiOx) may be formed on the substrate  210  formed with the semiconductor light emitting device  250 . When the transparent insulating layer is formed and then the second electrode  240  is placed thereon, the second electrode  240  may be located on the transparent insulating layer. Furthermore, the second electrode  240  may be formed to be separated from the conductive adhesive layer  230  or transparent insulating layer. 
     If a transparent electrode such as indium tin oxide (ITO) is used to locate the second electrode  240  on the semiconductor light emitting device  250 , the ITO material has a problem of bad adhesiveness with an n-type semiconductor. Accordingly, the second electrode  240  may be placed between the semiconductor light emitting devices  250 , thereby obtaining an advantage in which the transparent electrode is not required. Accordingly, an n-type semiconductor layer and a conductive material having a good adhesiveness may be used as a horizontal electrode without being restricted by the selection of a transparent material, thereby enhancing the light extraction efficiency. 
     According to the drawing, a partition wall  290  may be formed between the semiconductor light emitting devices  250 . In other words, the partition wall  290  may be disposed between the vertical semiconductor light emitting devices  250  to isolate the semiconductor light emitting device  250  constituting individual pixels. In this case, the partition wall  290  may perform the role of dividing individual sub-pixels from one another, and be formed as an integral body with the conductive adhesive layer  230 . For example, a base member of the anisotropic conductive film may form the partition wall when the semiconductor light emitting device  250  is inserted into the anisotropic conductive film. 
     Furthermore, when the base member of the anisotropic conductive film is black, the partition wall  290  may have reflective characteristics while at the same time increasing contrast with no additional black insulator. 
     For another example, a reflective partition wall may be separately provided with the partition wall  290 . In this case, the partition wall  290  may include a black or white insulator according to the purpose of the display device. 
     If the second electrode  240  is precisely located on the conductive adhesive layer  230  between the semiconductor light emitting devices  250 , the partition wall  290  may be located between the semiconductor light emitting device  250  and second electrode  240 . Accordingly, individual sub-pixels may be configured even with a small size using the semiconductor light emitting device  250 , and a distance between the semiconductor light emitting devices  250  may be relatively sufficiently large to place the second electrode  240  between the semiconductor light emitting devices  250 , thereby having the effect of implementing a flexible display device having a HD image quality. 
     Furthermore, according to the drawing, a black matrix  291  may be disposed between each phosphor layer to enhance contrast. In other words, the black matrix  291  can enhance the contrast of luminance. 
     As described above, the semiconductor light emitting device  250  is located on the conductive adhesive layer  230 , thereby constituting individual pixels on the display device. Since the semiconductor light emitting device  250  has excellent luminance characteristics, thereby configuring individual sub-pixels even with a small size thereof. As a result, it may be possible to implement a full color display in which the sub-pixels of red (R), green (G) and blue (B) implement one pixel by means of the semiconductor light emitting device. 
     As described above, in a display device using a semiconductor light emitting device according to the present disclosure, a structure in which a phosphor layer is formed on an ultraviolet (UV) emitting device may be taken into consideration as illustrated in  FIG. 5C , and hereinafter, the structure will be described in more detail. 
       FIG. 10  is a partial cross-sectional view illustrating a display device according to an embodiment of the present disclosure, and  FIG. 11  is a plan view illustrating a display device according to an embodiment of  FIG. 10 , and  FIG. 12  is a cross-sectional view illustrating a semiconductor light emitting device in  FIG. 10 . 
     Referring to  FIGS. 10 and 11 , a display device  1001  according to an embodiment may include a lower substrate  1010  disposed with a line electrode  1011  at an upper portion thereof, a plurality of semiconductor light emitting devices  1100  located on the line electrode  1011  to generate light, a wavelength converter  1030  disposed on the semiconductor light emitting device  1100  to convert a wavelength of light generated from the semiconductor light emitting device  1100 , and a conductive adhesive layer  1020  including conductors  1022  configured to electrically connect the lower substrate  1010  to the semiconductor light emitting device  1100  and a body  1021  configured to surround the conductors  1022 . 
     The lower substrate  1010  may have a film shape with an insulating material. For example, the lower substrate  1010  may be made of a glass material or made of a transparent plastic or polymer film with excellent flexibility. 
     More specifically, the lower substrate  1010  may be a flexible substrate. For example, the lower substrate  1010  may include glass or polyimide (PI) to implement a flexible display device. In addition, any one may be used if it is an insulating and flexible material, for example, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), and the like. Furthermore, the lower substrate  1010  may include either one of a transparent and a non-transparent material as illustrated in  FIG. 5A . 
     A line electrode  1011  may be disposed at a location corresponding to the semiconductor light emitting device  1100  on a lower substrate  1010  thereof. The line electrode  1011  may commonly refer to a second electrode  140  (refer to  FIG. 3A ) and an auxiliary electrode  170  (refer to  FIG. 3A ) on the substrate described with reference to  FIGS. 3A and 3B . 
     More specifically, the line electrode  1011  may be disposed to correspond to (be vertically overlapped with) a location of the first conductive electrode  1140  and a second conductive electrode  1150  of the semiconductor light emitting device  1100 . 
     The line electrode  1011  may include a conductive material, and for example, a metal selected from a group consisting of In, Co, Si, Ge, Au, Pd, Pt, Ru, Re, Mg, Zn, Hf, Ta, Rh, Jr, W, Ti, Ag, Cr, Mo, Nb, Al, Ni, Cu, and WTi, or include an alloy thereof, and formed with a single layer or multiple layers. Otherwise, the line electrode  1011  may be formed of a light transmitting material, and for example, formed by including at least one of ITO, IZO(In—ZnO), GZO(Ga—ZnO), AZO(Al—ZnO), AGZO(Al—Ga ZnO), IGZO(In—Ga ZnO), IrO x , RuO x , RuO x /ITO, Ni/IrO x /Au and Ni/IrO x /Au/ITO. 
     The line electrode  1011  is formed using a deposition method such as sputtering the foregoing conductive material on the lower substrate  1010 . Subsequently, a metal layer may be patterned and formed with a photolithographic process or etching process using a mask. 
     The line electrodes  1011  may be disposed to be crossed with each other, and a switching element (not shown) may be located at the foregoing cross-section. 
     The line electrode  1011  may be disposed in consideration of a pixel region (P) which will be described later. 
     The wavelength converter is disposed on the semiconductor light emitting device  1100  to convert a wavelength of light generated from the semiconductor light emitting device  1100 . The wavelength converter  1030  may be a color substrate. 
     Furthermore, one region of the protective substrate may block light and the other region may transmit light, thereby partitioning them into a plurality of pixel regions (Ps) and out-of-pixel regions (P&#39;s). 
     The plurality of pixel regions (Ps) may be arranged in a matrix type having rows and columns. 
     The out-of-pixel region (P′) of the wavelength converter  1030  is disposed with a black matrix at regular intervals to define a pixel region (P). 
     For example, the wavelength converter  1030  may include a black matrix and a color filter. 
     The black matrix is formed in a matrix form on the wavelength converter (color substrate)  1030 . The black matrix may divide a region of the wavelength converter (color substrate)  1030  into a plurality of pixel regions (Ps) to be formed with the color filter, thereby preventing optical interference between the adjoining pixel regions (Ps) and external light reflection. 
     A plurality of color filters (R, G, B) are located in the pixel region (P) corresponding to a space between the black matrices. 
     The color filter may be formed to divide the pixel region (P) divided by the black matrix into red, green and blue color filters (R, G, B) to transmit red, green and blue light, respectively. The red, green and blue color filters (R, G, B) for expressing color may be arranged in a stripe form along each column direction. 
     The black matrix may include a material for blocking light, for example, nontransmitting synthetic resin. 
     The color filter may be disposed to be vertically overlapped with a plurality of semiconductor light emitting devices  1100  (based on  FIG. 10 ). Furthermore, the black matrix may be disposed not to be vertically overlapped with a plurality of semiconductor light emitting devices  1100 . Accordingly, most of light generated from the semiconductor light emitting device  1100  may be emitted to the outside through the color filter, thereby enhancing the efficiency and luminance of the display device  1001 . 
     The color filter may include a phosphor for converting a wavelength of light generated from the semiconductor light emitting device  1100 . For example, at least one or more phosphors may be selected for the color filter  1031  according to the wavelength of light to be implemented. 
     At least one of a blue-emitting phosphor, a cyan-emitting phosphor, a green-emitting phosphor, a yellowish-green-emitting phosphor, a yellow-emitting phosphor, and a yellowish-red-emitting phosphor, an orange-emitting phosphor, and red light-emitting phosphor according may be applicable to the phosphor according to the wavelength of light emitted from the semiconductor light emitting device  1100 . 
     In other words, the phosphor may be excited by light having first color emitted from the semiconductor light emitting device  1100  to generate second color. 
     For example, when the semiconductor light emitting device  1100  is a blue-emitting diode and the phosphor is a yellow phosphor, the yellow phosphor may be excited by blue color to emit yellow color. 
     The phosphor may be a publicly known phosphor, such as YAG-based, TAG-based, sulphide-based, silicate-based, aluminate-based, nitride-based, carbide-based, nitridosilicate-based, borate-based, fluoride-based, phosphate-based and the like. 
     Referring to  FIGS. 10 and 12 , the semiconductor light emitting device  1100  is located to correspond to the pixel region (P) on the line electrode  1011 . 
     The semiconductor light emitting device  1100  may be an inorganic semiconductor selected from a semiconductor material having a composition formula of In x Al y Ga 1-x-y N (0≦x≦1, 0≦x≦1, 0≦x+y≦1). 
     In case of a liquid crystal display, there exist a problem such as not-so-fast response time, high current consumption due to a low efficiency of backlight unit, no guarantee of the two-year life span due to low reliability in organic materials in case of organic light emitting diodes (OLEDs), and very low yield of mass production. 
     According to an embodiment, an inorganic semiconductor light emitting device  1100  may be disposed at the pixel region (P), thereby having an advantage capable of implementing a high-speed screen with a fast response time. 
     Furthermore, an additional back light may be not required, thereby having an advantage of excellent luminance and excellent efficiency. 
     Furthermore, the semiconductor light emitting device  1100  may be an inorganic material, thereby having an advantage of long life span. 
     Furthermore, according to an embodiment, the semiconductor light emitting device  1100  may be disposed in a pixel unit, thereby having an advantage of being implemented easily with an active type. 
     The semiconductor light emitting device  1100  may emit an ultraviolet (UV) region of or blue light. In case of light with a short wavelength may have excellent luminance characteristics, thereby having an advantage capable of obtaining high luminance light at a low voltage. 
     For example, semiconductor light emitting device  1100  may be formed using a method such as metal organic chemical vapor deposition (MOCVD), chemical vapor deposition (CVD), plasma-enhanced chemical vapor deposition (PECVD), molecular beam epitaxy (MBE), hydride vapor phase epitaxy (HYPE), sputtering, and the like, but may not be necessarily limited to this. 
     For example, the semiconductor light emitting device  1100  may include a first conductive semiconductor layer  1110 , an active layer  1120  located on the first conductive semiconductor layer  1110 , and a second conductive semiconductor layer  1130  located on the active layer  1120 . 
     The first conductive semiconductor layer  1110  may be formed of a semiconductor compound and doped with a first conductive dopant. For example, the first conductive semiconductor layer  1110  may be implemented with an n-type semiconductor layer, and electrons may be provided to the active layer  1120 . The first conductive semiconductor layer  1110  may be selected from a semiconductor material having a composition formula of In x Al y Ga 1-x-y N (0≦x≦1, 0≦y≦1, 0≦x+y≦1), for example, GaN, AN, AlGaN, InGaN, InN, InAlGaN, AlInN and the like, and an n-type dopant such as Si, Ge, Sn, Se, Te and the like may be doped therein. 
     The active layer  1120  may be formed on the first conductive semiconductor layer  1110 . The active layer  1120  may be formed with a single or multiple quantum well structure, a quantum wire structure or quantum dot structure, and the like using a compound semiconductor material with 3-5 group elements. 
     When the active layer  1120  is formed with a quantum well structure, it may have a single or multiple quantum well structure having a well layer having a composition formula of In x Al y Ga 1-x-y N (0≦x≦1, 0≦y≦1, 0≦x+y≦1) and a barrier layer having a composition formula of In a Al b Ga 1-a-b N (0≦a≦1, 0≦b≦1, 0≦a+b≦1), for instance. The well layer may be formed of a material having a band gap lower than that of the barrier layer. 
     Furthermore, when the active layer  1120  is formed with a multiple quantum well structure, each well layer (not shown) may have different indium (In) content and a different band gap, and it will be described later with reference to  FIG. 11 . 
     A conductive clad layer (not shown) may be formed above or/and below the active layer  1120 . The conductive clad layer (not shown) may be formed of a semiconductor, and may have a band gap greater than that of the active layer  1120 . For example, the conductive clad layer (not shown) may be formed to contain AlGaN. 
     The second conductive semiconductor layer  1130  may be formed of a semiconductor compound to inject holes to the active layer  1120 , and a second conductive dopant may be doped therein. For example, the second conductive semiconductor layer  1130  may be implemented with a p-type semiconductor layer. The second conductive semiconductor layer  1130  may be selected from a semiconductor material having a composition formula of In x Al y Ga 1-x-y N (0≦x≦1, 0≦y≦1, 0≦x+y≦1), for example, GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN and the like, and a p-type dopant such as Mg, Zn, Ca, Sr, Ba and the like may be doped therein. 
     On the other hand, an interlayer (not shown) may be formed between the active layer  1120  and second conductive semiconductor layer  1130 , and the interlayer may prevent a phenomenon in which electrons injected to the active layer  1120  from the first conductive semiconductor layer  1110  during the application of a high current flow to the second conductive semiconductor layer  1130  without being recombined at the active layer  1120 . The interlayer may have a band gap relatively greater than that of the active layer  1120 , thereby preventing a phenomenon in which electrons injected from the first conductive semiconductor layer  1110  are injected to the second conductive semiconductor layer  1130  without being recombined at the active layer  1120 . Accordingly, it may be possible to increase a probability of recombining electrons with holes at the active layer  1120  as well as suppress a leakage current. 
     Furthermore, the first conductive semiconductor layer  1110  may be implemented with a p-type semiconductor layer, and the second conductive semiconductor layer  1130  may be implemented with an n-type semiconductor layer, and a third semiconductor layer (not shown) including an n-type or p-type semiconductor layer having an opposite polarity to that of the second conductive semiconductor layer  1130  may be formed on the second conductive semiconductor layer  1130 . Accordingly, the light emitting device may have at least any one of np, pn, npn, pnp junction structures. 
     A light transmitting electrode layer (not shown) may be formed on the second conductive semiconductor layer  1130 . The transparent electrode layer may be formed by including at least one of ITO, IZO(In—ZnO), GZO(Ga—ZnO), AZO(Al—ZnO), AGZO(Al—Ga ZnO), IGZO(In—Ga ZnO), IrO x , RuO x , RuO x /ITO, Ni/IrO x /Au and Ni/IrO x /Au/ITO. Accordingly, the light transmitting electrode layer may emit light generated from the active layer  1120  to the outside, and be formed on the entire or partial outer surface of the second conductive semiconductor layer  1130 , thereby preventing a current crowding phenomenon. 
     On the other hand, a first conductive electrode  1140  electrically connected to the first conductive semiconductor layer  1110  may be disposed at the first conductive semiconductor layer  1110 . For example, the first conductive electrode  1140  may be formed on a lower surface of the first conductive semiconductor layer  1110 . 
     Furthermore, a second conductive electrode  1150  electrically connected to the second conductive semiconductor layer  1130  may be disposed at the second conductive semiconductor layer  1130 . 
     For example, part of the active layer  1120  and first conductive semiconductor layer  1110  may be removed to expose part of a lower surface of the second conductive semiconductor layer  1130 , and the first electrode  1140  may be formed on the exposed lower surface of the second conductive semiconductor layer  1130 . Meanwhile, a method of exposing part of the first conductive semiconductor layer  1110  may use a predetermined etching method, but may not be necessarily limited to this. Furthermore, a wet or dry etching method may be used for the etching method. 
     The first electrode  1140  and second electrode  1150  may be formed with a deposition method such as sputtering and the like. However, it may not be necessarily limited to this. 
     The first electrode  1140  and second electrode  1150  may be disposed to be protruded in the direction of the lower substrate  1010  in the semiconductor light emitting device  1100 . Furthermore, the lower surfaces of the first electrode  1140  and second electrode  1150  may be disposed on the same plane, thereby providing stability when the line electrode  1011  of the lower substrate  1010  is adhered to the semiconductor light emitting device  1100 . 
     Furthermore, the first electrode  1140  and second electrode  1150  may be located in a lower region of the active layer  1120 . 
     Since light generated from the active layer  1120  is not absorbed to the first conductive electrode  1140  and second conductive electrode  1150  while being advanced in the wavelength converter  1030 , thereby preventing the reduction of luminance and brightness from being caused due to an absorption of light into the first conductive electrode  1140  and second conductive electrode  1150 . 
     On the other hand, the first conductive electrode  1140  and second conductive electrode  1150  may include a conductive material, and for example, a metal selected from a group consisting of In, Co, Si, Ge, Au, Pd, Pt, Ru, Re, Mg, Zn, Hf, Ta, Rh, Ir, W, Ti, Ag, Cr, Mo, Nb, Al, Ni, Cu, and WTi, or include an alloy thereof, and formed with a single layer or multiple layers, but may not be necessarily limited to this. 
     On the other hand, a lower surface of the first conductive semiconductor layer  1110  may further include a reflective layer  1160 . Specifically, the reflective layer  1160  may be disposed in a region excluding a region in which the first electrode  1140  is located at a lower surface of the first conductive semiconductor layer  1110 . 
     The reflective layer  1160  may form a structure in which layers with different refractive indices are deposited in an alternately repeated manner. For example, the reflective layer  1160  may at least include a first layer  1161  having a first refractive index and a second layer  1162  having a second refractive index different from the first refractive index. The first layer  1161  of the reflective layer  1160  may be a high refractive index layer and the second layer  1162  thereof may be a low refractive index layer. On the contrary, the first layer  1161  thereof may be a low refractive index layer, and the second layer  1162  thereof may be a high refractive index layer, but it may not be necessarily limited to this. The reflective layer  1160  may be deposited with 2 to 30 layers, but may not be necessarily limited to this. 
     In case where 2 is a reference wavelength of light generated from the semiconductor light emitting device  1100 , n is a refractive index of the medium, and m is an odd number, the reflective layer  1160  may be formed with a deposition layer in which the first layer  1161  having a high refractive index with a thickness of mλ/4n and the second layer  1162  having a low refractive index are deposited in an alternately repeated manner to obtain a reflective ratio greater than 95% over a specific bandwidth band of light. 
     The first layer  1161  having a high refractive index and the second layer  1162  having a low refractive index may have a thickness of λ/4 of the reference wavelength, and herein, each layer  1161 ,  1162  may be formed with a thickness of 2 A to 10 μm. Furthermore, the thickness of the reflective layer  1160  may be 100 to 10000 A, but may not be necessarily limited to this, and may be also less or greater than that. In addition, each layer  1161 ,  1162  forming the reflective layer  1160  may be formed of MxOy (M: Metal, O: Oxide, X, Y: constant). For example, the reflective layer  1160  may include any one of SiO 2 , Al 2 O 3 , SiC, AlB, BN and TiO 2 . However, it may not be necessarily limited to this. For example, the first layer  1161  having a high refractive index may include TiO 2  having a refractive index greater than 2 or the like, and the second layer  1162  having a low refractive index may include SiO 2  with a refractive index of 1.4 or Al 2 O 3  with a refractive index of 1.6. On the contrary, in case where the first layer  1161  has a low refractive index and the second layer  1162  has a high refractive index, the first layer  1161  may include SiO 2  or Al 2 O 3  and the second layer  1162  may include TiO 2, but it may not be necessarily limited to this. 
     Accordingly, light generated from the active layer  1120  may be reflected on reflective layer  1160  to distribute light in the upward direction. 
     Referring to  FIGS. 10 and 11  again, the conductive adhesive layer  1020  may be formed on one surface of the lower substrate  1010 . 
     The conductive adhesive layer  1020  may be a layer having adhesiveness and conductivity, and to this end, a material having conductivity and a material having adhesiveness may be mixed at the conductive adhesive layer  1020 . Furthermore, the conductive adhesive layer  1020  may have softness, thereby allowing a flexible function in a display device. 
     According to the drawing, the conductive adhesive layer  1020  according to the present example may include conductors  1022  for electrically connecting the lower substrate  1010  to the semiconductor light emitting device  1100  and a body  1021  for surrounding the conductors  1022 . 
     The conductive adhesive layer  1020  may include conductors  1022  having electrical conductivity. For the conductive adhesive layer  1020 , the conductors  1022  may be disposed within the body  1021  having viscosity. 
     The conductive adhesive layer  1020  may be an anisotropic conductive film (ACF) made of an adhesive resin mixture containing the conductors  1022 . 
     According to the present example, it is illustrated a case where the conductive adhesive layer  1020  is an anisotropic conductive film (ACF), and the anisotropic conductive film is formed in such a manner that conductive balls are randomly intermixed in an insulating base member. However, the present disclosure may not be necessarily limited to this, various forms of the conductive adhesive layer described with reference to  FIGS. 3A and 3B  may be all applicable to the present example. For such an example, the anisotropic conductive film may be formed with a fixed array anisotropic conductive film (ACF) or with a form in which the insulating base member is configured with a plurality of layers and conductive balls are disposed any one layer thereof (double ACF), and the like. 
     The body  1021  having viscosity may be a resin mixture. For example, the body  1021  may include silicon (Si) resin, epoxy or acrylic resin. 
     The body  1021  may have electrical insulation. Furthermore, the body  1021  may have mobility. 
     The body  1021  may have adhesiveness. The body  1021  may include a thermoplastic adhesive such as styrene-based block copolymer, and the like, but may not be necessarily limited to this. 
     Furthermore, the conductive adhesive layer  1020  may include a thermosetting adhesive material such as epoxy resin and the like. The conductive adhesive layer  1020  may control its adhesiveness by controlling thickness, viscosity, flexibility, adhesion, impurity, elasticity, and the like. 
     Furthermore, the body  1021  may include a material for blocking a short wavelength region of light (blue light, ultraviolet (UV) rays). For example, the body  1021  may include zinc oxide or titanium dioxide. 
     The body  1021  blocks light generated from the semiconductor light emitting device  1100  to suppress optical interference between the adjoining pixel regions (Ps) and external light reflection. 
     The body  1021  may be disposed to surround at least the first conductive electrode  1140  and second conductive electrode  1150 . More preferably, the body  1021  may be disposed to surround the first conductive electrode  1140  and second conductive electrode  1150  and a lateral surface and a lower surface of the semiconductor light emitting device  1100 . 
     The body  1021  may perform the role of electrically connecting the first and the second conductive electrode  1140 ,  1150  to the line electrode  1011 , and adhering the lower substrate  1010  to the semiconductor light emitting device  1100 , and surround the semiconductor light emitting device  1100  to block optical interference between the semiconductor light emitting devices  1100 . 
     Furthermore, the body  1021  may isolate the semiconductor light emitting device  1100  from the outside to perform the role of protecting the semiconductor light emitting device  1100 . 
     The location of conductors  1022  located within the body  1021  may be moved according to a pressure applied by the outside. The conductive adhesive layer  1020  may be formed such that conductors  1022  are disposed in a regular or irregular manner within the body  1021 . 
     The conductive adhesive layer  1020  may control the size, shape, charge amount, dispersion state, thickness and the like of the conductors  1022  to change their conductivity. The conductive adhesive layer  1020  may be changed in its thermal conductivity, adhesiveness, mobility and the like according to an increase of the content of the conductors  1022 . 
     The conductors  1022  may be a metal particles such as nickel or particles in which a metal is coated on a resin, but may not be necessarily limited to the kinds thereof. In case of particles in which a metal is coated on a resin, the conductors  1022  may be formed such that a conductive material such as nickel, gold or the like are coated on a surface of polymer core body such as polystyrene resin, acrylic resin and the like. 
     The conductors  1022  may be disposed adjacent to the first conductive electrode  1140 , second conductive electrode  1150  and line electrode  1011  to electrically connect the first conductive electrode  1140  and second conductive electrode  1150  to the line electrode  1011 . 
     Specifically, the conductors  1022  may be located between the first conductive electrode  1140  and second conductive electrode  1150  and the line electrode  1011 . 
       FIGS. 13 through 17  are a flow chart illustrating a method of fabricating a display device according to an embodiment. 
     A method of fabricating the semiconductor light emitting device  1100  according to an embodiment will be described below. 
     Referring to  FIG. 13 , a growth substrate  1101  is prepared. 
     The growth substrate  1101  (wafer) may be formed with a material having light transmitting properties, for example, including any one of sapphire (Al 2 O 3 ), GaN, ZnO, and AlO, but may not be necessarily limited to this. Furthermore, the growth substrate  1101  may be formed of a material suitable to semiconductor material growth, namely, carrier wafer. Furthermore, the growth substrate  1101  may be formed of a material with excellent thermal conductivity characteristics, and may include a conductive substrate or insulating substrate to use an SiC substrate having a thermal conductivity greater than that of sapphire (Al 2 O 3 ) substrate or any one of Si, GaAs, GaP, InP, and Ga 2 O 3 . 
     A buffer layer  1102  for alleviating a lattice mismatch between the growth substrate  1101  and first conductive semiconductor layer  1110  and allowing the semiconductor layer to be easily grown may be located on the growth substrate  1101 . The buffer layer  1102  may be formed in a low temperature atmosphere, and made of a material capable of alleviating a lattice constant difference between the semiconductor layer and growth substrate  1101 . For example, the buffer layer  1102  may include a material such as GaN, InN, AN, AlInN, InGaN, AlGaN, and InAlGaN, but may not be necessarily limited to this. 
     The buffer layer  1102  may be grown as a single crystal on the growth substrate  1101 , and the buffer layer  1102  grown as a single crystal may enhance the crystallinity of the first conductive semiconductor layer  1110  being grown on the buffer layer  1102 . 
     A light emitting structure including the second conductive semiconductor layer  1130 , the active layer  1120  located on the second conductive semiconductor layer  1130 , and the first conductive semiconductor layer  1110  located on the active layer  1120  is grown on the buffer layer  1102 . 
     A reflective layer  1163  is formed on the first conductive semiconductor layer  1110 . 
     Referring to  FIG. 14 , the light emitting structure is partitioned for each semiconductor light emitting device  1100  for each semiconductor light emitting device  1100 . In other words, the first conductive semiconductor layer  1110 , active layer  1120  and second conductive semiconductor layer  1130  may be removed in a matrix form, and thus partitioned into each semiconductor light emitting device  1100 . 
     For a method of being partitioned into each semiconductor light emitting device  1100 , wet etching, dry etching or laser lift off (LLO) methods may be used, but the present disclosure may not be necessarily limited to this. 
     Furthermore, one region of the first conductive semiconductor layer  1110  and active layer  1120  is removed to expose one region of the second conductive semiconductor layer  1130 . 
     Then, the first conductive electrode  1140  and second conductive electrode  1150  are formed on an upper surface of the first conductive semiconductor layer  1110  and an upper surface of the exposed second conductive semiconductor layer  1130 . 
     The first conductive electrode  1140  and second conductive electrode  1150  may be formed with a deposition method such as sputtering or the like. However, the present disclosure may not be necessarily limited to this. 
     Referring to  FIG. 15 , the lower substrate  1010  disposed with the line electrode  1011  is provided at an upper portion thereof. 
     A conductive adhesive layer  1020  having adhesiveness, mobility and viscosity is disposed on the lower substrate  1010 . 
     A set in which the semiconductor light emitting device  1100  and growth substrate  1101  are coupled to each other is prepared such that the first conductive electrode  1140  and second conductive electrode  1150  of the semiconductor light emitting device  1100  are directed toward the lower substrate  1010 . 
     A set with the semiconductor light emitting device  1100  and growth substrate  1101  is aligned with the line electrode  1011 , and then heat is applied thereto while pressuring the conductive adhesive layer  1020 . 
     The conductive adhesive layer  1020  has mobility due to heat, and the semiconductor light emitting device  1100 , first conductive electrode  1140  and second conductive electrode  1150  are surrounded by the body  1021  of the conductive adhesive layer  1020 , and the first conductive electrode  1140  and second conductive electrode  1150  are electrically connected to the line electrode  1011  by means of the conductors  1022 . 
     Then, the conductive adhesive layer  1020  is cured during the process of dissipating heat. 
     Referring to  FIG. 16 , when the conductive adhesive layer  1020  is cured, the growth substrate  1101  and buffer layer  1102  are removed. For a method of removing the growth substrate  1101  and buffer layer  1102 , wet etching, dry etching or laser lift off (LLO) methods may be used, but the present disclosure may not be necessarily limited to this. 
     Referring to  FIG. 17 , the wavelength converter (color substrate)  1030  having the black matrix  1031  and color filter  1031  is bonded to a surface from which the growth substrate  1101  and buffer layer  1102  are removed (an upper surface of the second conductive semiconductor layer with reference to  FIG. 16 ). 
     Here, the color filters  1031  are disposed to be vertically overlapped with the semiconductor light emitting devices  1100 . 
     While the invention has been shown and described with respect to various embodiments of the present invention, it will be of course understood by those skilled in the art that various modifications may be made without departing from the gist of the invention as defined in the following claims, and it is to be noted that those modifications should not be understood individually from the technical concept and prospect of the present invention.