Patent ID: 12255187

BEST MODE FOR DISCLOSURE

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts, and redundant description thereof will be omitted. As used herein, the suffixes “module” and “unit” are added or used interchangeably to facilitate preparation of this specification and are not intended to suggest distinct meanings or functions. In describing embodiments disclosed in this specification, relevant well-known technologies may not be described in detail in order not to obscure the subject matter of the embodiments disclosed in this specification. In addition, it should be noted that the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and should not be construed as limiting the technical spirit disclosed in the present specification.

Furthermore, although the drawings are separately described for simplicity, embodiments implemented by combining at least two or more drawings are also within the scope of the present disclosure.

In addition, when an element such as a layer, region or module is described as being “on” another element, it is to be understood that the element may be directly on the other element or there may be an intermediate element between them.

The display device described herein is a concept including all display devices that display information with a unit pixel or a set of unit pixels. Therefore, the display device may be applied not only to finished products but also to parts. For example, a panel corresponding to a part of a digital TV also independently corresponds to the display device in the present specification. The finished products include a mobile phone, a smartphone, a laptop, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a slate PC, a tablet, an Ultrabook, a digital TV, a desktop computer, and the like.

However, it will be readily apparent to those skilled in the art that the configuration according to the embodiments described herein is applicable even to a new product that will be developed later as a display device.

In addition, the semiconductor light emitting element mentioned in this specification is a concept including an LED, a micro LED, and the like.

FIG.1is a conceptual view illustrating an embodiment of a display device using a semiconductor light emitting element according to the present disclosure.

As shown inFIG.1, information processed by a controller (not shown) of a display device100may be displayed using a flexible display.

The flexible display may include, for example, a display that can be warped, bent, twisted, folded, or rolled by external force.

Furthermore, the flexible display may be, for example, a display manufactured on a thin and flexible substrate that can be warped, bent, folded, or rolled like paper while maintaining the display characteristics of a conventional flat panel display.

When the flexible display remains in an unbent state (e.g., a state having an infinite radius of curvature) (hereinafter referred to as a first state), the display area of the flexible display forms a flat surface. When the display in the first sate is changed to a bent state (e.g., a state having a finite radius of curvature) (hereinafter referred to as a second state) by external force, the display area may be a curved surface. As shown inFIG.1, the information displayed in the second state may be visual information output on a curved surface. Such visual information may be implemented by independently controlling the light emission of sub-pixels arranged in a matrix form. The unit pixel may mean, for example, a minimum unit for implementing one color.

The unit pixel of the flexible display may be implemented by a semiconductor light emitting element. In the present disclosure, a light emitting diode (LED) is exemplified as a type of the semiconductor light emitting element configured to convert electric current into light. The LED may be formed in a small size, and may thus serve as a unit pixel even in the second state.

Hereinafter, a flexible display implemented using the LED will be described in more detail with reference to the drawings.

FIG.2is a partially enlarged view showing part A ofFIG.1.

FIGS.3A and3Bare cross-sectional views taken along lines B-B and C-C inFIG.2.

FIG.4is a conceptual view illustrating the flip-chip type semiconductor light emitting element ofFIG.3.

FIGS.5A to5Care conceptual views illustrating various examples of implementation of colors in relation to a flip-chip type semiconductor light emitting element.

As shown inFIGS.2,3A and3B, the display device100using a passive matrix (PM) type semiconductor light emitting element is exemplified as the display device100using a semiconductor light emitting element. However, the examples described below are also applicable to an active matrix (AM) type semiconductor light emitting element.

The display device100shown inFIG.1may include a substrate110, a first electrode120, a conductive adhesive layer130, a second electrode140, and at least one semiconductor light emitting element150, as shown inFIG.2.

The substrate110may be a flexible substrate. For example, to implement a flexible display device, the substrate110may include glass or polyimide (PI). Any insulative and flexible material such as polyethylene naphthalate (PEN) or polyethylene terephthalate (PET) may be employed. In addition, the substrate110may be formed of either a transparent material or an opaque material.

The substrate110may be a wiring substrate on which the first electrode120is disposed. Thus, the first electrode120may be positioned on the substrate110.

As shown inFIG.3A, an insulating layer160may be disposed on the substrate110on which the first electrode120is positioned, and an auxiliary electrode170may be positioned on the insulating layer160. In this case, a stack in which the insulating layer160is laminated on the substrate110may be a single wiring substrate. More specifically, the insulating layer160may be formed of an insulative and flexible material such as PI, PET, or PEN, and may be integrated with the substrate110to form a single substrate.

The auxiliary electrode170, which is an electrode that electrically connects the first electrode120and the semiconductor light emitting element150, is positioned on the insulating layer160, and is disposed to correspond to the position of the first electrode120. For example, the auxiliary electrode170may have a dot shape and may be electrically connected to the first electrode120by an electrode hole171formed through the insulating layer160. The electrode hole171may be formed by filling a via hole with a conductive material.

As shown inFIG.2or3A, a conductive adhesive layer130may be formed on one surface of the insulating layer160, but embodiments of the present disclosure are not limited thereto. For example, a layer performing a specific function may be formed between the insulating layer160and the conductive adhesive layer130, or the conductive adhesive layer130may be disposed on the substrate110without the insulating layer160. In a structure in which the conductive adhesive layer130is disposed on the substrate110, the conductive adhesive layer130may serve as an insulating layer.

The conductive adhesive layer130may be a layer having adhesiveness and conductivity. For this purpose, a material having conductivity and a material having adhesiveness may be mixed in the conductive adhesive layer130. In addition, the conductive adhesive layer130may have ductility, thereby providing making the display device flexible.

As an example, the conductive adhesive layer130may be an anisotropic conductive film (ACF), an anisotropic conductive paste, a solution containing conductive particles, or the like. The conductive adhesive layer130may be configured as a layer that allows electrical interconnection in the direction of the Z-axis extending through the thickness, but is electrically insulative in the horizontal X-Y direction. Accordingly, the conductive adhesive layer130may be referred to as a Z-axis conductive layer (hereinafter, referred to simply as a “conductive adhesive layer”).

The ACF is a film in which an anisotropic conductive medium is mixed with an insulating base member. When the ACF is subjected to heat and pressure, only a specific portion thereof becomes conductive by the anisotropic conductive medium. Hereinafter, it will be described that heat and pressure are applied to the ACF. However, another method may be used to make the ACF partially conductive. The other method may be, for example, application of only one of the heat and pressure or UV curing.

In addition, the anisotropic conductive medium may be, for example, conductive balls or conductive particles. For example, the ACF may be a film in which conductive balls are mixed with an insulating base member. Thus, when heat and pressure are applied to the ACF, only a specific portion of the ACF is allowed to be conductive by the conductive balls. The ACF may contain a plurality of particles formed by coating the core of a conductive material with an insulating film made of a polymer material. In this case, as the insulating film is destroyed in a portion to which heat and pressure are applied, the portion is made to be conductive by the core. At this time, the cores may be deformed to form layers that contact each other in the thickness direction of the film. As a more specific example, heat and pressure are applied to the whole ACF, and an electrical connection in the Z-axis direction is partially formed by the height difference of a counterpart adhered by the ACF.

As another example, the ACF may contain a plurality of particles formed by coating an insulating core with a conductive material. In this case, as the conductive material is deformed (pressed) in a portion to which heat and pressure are applied, the portion is made to be conductive in the thickness direction of the film. As another example, the conductive material may be disposed through the insulating base member in the Z-axis direction to provide conductivity in the thickness direction of the film. In this case, the conductive material may have a pointed end.

The ACF may be a fixed array ACF in which conductive balls are inserted into one surface of the insulating base member. More specifically, the insulating base member may be formed of an adhesive material, and the conductive balls may be intensively disposed on the bottom portion of the insulating base member. Thus, when the base member is subjected to heat and pressure, it may be deformed together with the conductive balls, exhibiting conductivity in the vertical direction.

However, the present disclosure is not necessarily limited thereto, and the ACF may be formed by randomly mixing conductive balls in the insulating base member, or may be composed of a plurality of layers with conductive balls arranged on one of the layers (as a double-ACF).

The anisotropic conductive paste may be a combination of a paste and conductive balls, and may be a paste in which conductive balls are mixed with an insulating and adhesive base material. Also, the solution containing conductive particles may be a solution containing any conductive particles or nanoparticles.

Referring back toFIG.3A, the second electrode140is positioned on the insulating layer160and spaced apart from the auxiliary electrode170. That is, the conductive adhesive layer130is disposed on the insulating layer160having the auxiliary electrode170and the second electrode140positioned thereon.

After the conductive adhesive layer130is formed with the auxiliary electrode170and the second electrode140positioned on the insulating layer160, the semiconductor light emitting element150is connected thereto in a flip-chip form by applying heat and pressure. Thereby, the semiconductor light emitting element150is electrically connected to the first electrode120and the second electrode140.

Referring toFIG.4, the semiconductor light emitting element may be a flip chip-type light emitting device.

For example, the semiconductor light emitting element may include a p-type electrode156, a p-type semiconductor layer155on which the p-type electrode156is formed, an active layer154formed on the p-type semiconductor layer155, an n-type semiconductor layer153formed on the active layer154, and an n-type electrode152disposed on the n-type semiconductor layer153and horizontally spaced apart from the p-type electrode156. In this case, the p-type electrode156may be electrically connected to the auxiliary electrode170, which is shown inFIG.3, by the conductive adhesive layer130, and the n-type electrode152may be electrically connected to the second electrode140.

Referring back toFIGS.2,3A and3B, the auxiliary electrode170may be elongated in one direction. Thus, one auxiliary electrode may be electrically connected to the plurality of semiconductor light emitting elements150. For example, p-type electrodes of semiconductor light emitting elements on left and right sides of an auxiliary electrode may be electrically connected to one auxiliary electrode.

More specifically, the semiconductor light emitting element150may be press-fitted into the conductive adhesive layer130by heat and pressure. Thereby, only the portions of the semiconductor light emitting element150between the p-type electrode156and the auxiliary electrode170and between the n-type electrode152and the second electrode140may exhibit conductivity, and the other portions of the semiconductor light emitting element150do not exhibit conductivity as they are not press-fitted. In this way, the conductive adhesive layer130interconnects and electrically connects the semiconductor light emitting element150and the auxiliary electrode170and interconnects and electrically connects the semiconductor light emitting element150and the second electrode140.

The plurality of semiconductor light emitting elements150may constitute a light emitting device array, and a phosphor conversion layer180may be formed on the light emitting device array.

The light emitting device array may include a plurality of semiconductor light emitting elements having different luminance values. Each semiconductor light emitting element150may constitute a unit pixel and may be electrically connected to the first electrode120. For example, a plurality of first electrodes120may be provided, and the semiconductor light emitting elements may be arranged in, for example, several columns. The semiconductor light emitting elements in each column may be electrically connected to any one of the plurality of first electrodes.

In addition, since the semiconductor light emitting elements are connected in a flip-chip form, semiconductor light emitting elements grown on a transparent dielectric substrate may be used. The semiconductor light emitting elements may be, for example, nitride semiconductor light emitting elements. Since the semiconductor light emitting element150has excellent luminance, it may constitute an individual unit pixel even when it has a small size.

As shown inFIG.3, a partition wall190may be formed between the semiconductor light emitting elements150. In this case, the partition wall190may serve to separate individual unit pixels from each other, and may be integrated with the conductive adhesive layer130. For example, by inserting the semiconductor light emitting element150into the ACF, the base member of the ACF may form the partition wall.

In addition, when the base member of the ACF is black, the partition wall190may have reflectance and increase contrast even without a separate black insulator.

As another example, a reflective partition wall may be separately provided as the partition wall190. In this case, the partition wall190may include a black or white insulator depending on the purpose of the display device. When a partition wall including a white insulator is used, reflectivity may be increased. When a partition wall including a black insulator is used, it may have reflectance and increase contrast.

The phosphor conversion layer180may be positioned on the outer surface of the semiconductor light emitting element150. For example, the semiconductor light emitting element150may be a blue semiconductor light emitting element that emits blue (B) light, and the phosphor conversion layer180may function to convert the blue (B) light into a color of a unit pixel. The phosphor conversion layer180may be a red phosphor181or a green phosphor182constituting an individual pixel.

That is, the red phosphor181capable of converting blue light into red (R) light may be laminated on a blue semiconductor light emitting element at a position of a unit pixel of red color, and the green phosphor182capable of converting blue light into green (G) light may be laminated on the blue semiconductor light emitting element at a position of a unit pixel of green color. Only the blue semiconductor light emitting element may be used alone in the portion constituting the unit pixel of blue color. In this case, unit pixels of red (R), green (G), and blue (B) may constitute one pixel. More specifically, a phosphor of one color may be laminated along each line of the first electrode120. Accordingly, one line on the first electrode120may be an electrode for controlling one color. That is, red (R), green (G), and blue (B) may be sequentially disposed along the second electrode140, thereby implementing a unit pixel.

However, embodiments of the present disclosure are not limited thereto. Unit pixels of red (R), green (G), and blue (B) may be implemented by combining the semiconductor light emitting element150and the quantum dot (QD) rather than using the phosphor.

Also, a black matrix191may be disposed between the phosphor conversion layers to improve contrast. That is, the black matrix191may improve contrast of light and darkness.

However, embodiments of the present disclosure are not limited thereto, and anther structure may be applied to implement blue, red, and green colors.

FIGS.5A to5Care conceptual diagrams illustrating various examples of color implementation with respect to a flip-chip type semiconductor light emitting element.

Referring toFIG.5A, each semiconductor light emitting element may be implemented as a high-power light emitting device emitting light of various colors including blue by using gallium nitride (GaN) as a main material and adding indium (In) and/or aluminum (Al).

In this case, each semiconductor light emitting element may be a red, green, or blue semiconductor light emitting element to form a unit pixel (sub-pixel). For example, red, green, and blue semiconductor light emitting elements R, G, and B may be alternately disposed, and unit pixels of red, green, and blue may constitute one pixel by the red, green and blue semiconductor light emitting elements. Thereby, a full-color display may be implemented.

Referring toFIG.5B, the semiconductor light emitting element150amay include a white light emitting device W having a yellow phosphor conversion layer, which is provided for each device. In this case, in order to form a unit pixel, a red phosphor conversion layer181, a green phosphor conversion layer182, and a blue phosphor conversion layer183may be disposed on the white light emitting device W. In addition, a unit pixel may be formed using a color filter repeating red, green, and blue on the white light emitting device W.

Referring toFIG.5C, a red phosphor conversion layer181, a green phosphor conversion layer185, and a blue phosphor conversion layer183may be provided on a ultraviolet light emitting device. Not only visible light but also ultraviolet (UV) light may be used in the entire region of the semiconductor light emitting element. In an embodiment, UV may be used as an excitation source of the upper phosphor in the semiconductor light emitting element.

Referring back to this example, the semiconductor light emitting element is positioned on the conductive adhesive layer to constitute a unit pixel in the display device. Since the semiconductor light emitting element has excellent luminance, individual unit pixels may be configured despite even when the semiconductor light emitting element has a small size.

Regarding the size of such an individual semiconductor light emitting element, the length of each side of the device may be, for example, 80 μm or less, and the device may have a rectangular or square shape. When the semiconductor light emitting element has a rectangular shape, the size thereof may be less than or equal to 20 μm×80 μm.

In addition, even when a square semiconductor light emitting element having a side length of 10 μm is used as a unit pixel, sufficient brightness to form a display device may be obtained.

Therefore, for example, in case of a rectangular pixel having a unit pixel size of 600 μm×300 μm (i.e., one side by the other side), a distance of a semiconductor light emitting element becomes sufficiently long relatively.

Thus, in this case, it is able to implement a flexible display device having high image quality over HD image quality.

The above-described display device using the semiconductor light emitting element may be prepared by a new fabricating method. Such a fabricating method will be described with reference toFIG.6as follows.

FIG.6shows cross-sectional views of a method of fabricating a display device using a semiconductor light emitting element according to the present disclosure.

Referring toFIG.6, first of all, a conductive adhesive layer130is formed on an insulating layer160located between an auxiliary electrode170and a second electrode140. The insulating layer160is tacked on a wiring substrate110. On the wiring substrate110, a first electrode120, the auxiliary electrode170and the second electrode140are disposed. In this case, the first electrode120and the second electrode140may be disposed in mutually orthogonal directions, respectively. In order to implement a flexible display device, the wiring substrate110and the insulating layer160may include glass or polyimide (PI) each.

For example, the conductive adhesive layer130may be implemented by an anisotropic conductive film. To this end, an anisotropic conductive film may be coated on the substrate on which the insulating layer160is located.

Subsequently, a temporary substrate112, on which a plurality of semiconductor light emitting elements150configuring individual pixels are located to correspond to locations of the auxiliary electrode170and the second electrodes140, is disposed in a manner that the semiconductor light emitting element150confronts the auxiliary electrode170and the second electrode140.

In this regard, the temporary112substrate112is a growing substrate for growing the semiconductor light emitting element150and may include a sapphire or silicon substrate.

The semiconductor light emitting element is configured to have a space and size for configuring a display device when formed in unit of wafer, thereby being effectively used for the display device.

Subsequently, the wiring substrate110and the temporary substrate112are thermally compressed together. By the thermocompression, the wiring substrate110and the temporary substrate112are bonded together. Owing to the property of an anisotropic conductive film having conductivity by thermocompression, only a portion among the semiconductor light emitting element150, the auxiliary electrode170and the second electrode140has conductivity, via which the electrodes and the semiconductor light emitting element150may be connected electrically. In this case, the semiconductor light emitting element150is inserted into the anisotropic conductive film, by which a partition may be formed between the semiconductor light emitting elements150.

Then the temporary substrate112is removed. For example, the temporary substrate112may be removed using Laser Lift-Off (LLO) or Chemical Lift-Off (CLO).

Finally, by removing the temporary substrate112, the semiconductor light emitting elements150exposed externally. If necessary, the wiring substrate110to which the semiconductor light emitting elements150are coupled may be coated with silicon oxide (SiOx) or the like to form a transparent insulating layer (not shown).

In addition, a step of forming a phosphor layer on one side of the semiconductor light emitting element150may be further included. For example, the semiconductor light emitting element150may include a blue semiconductor light emitting element emitting Blue (B) light, and a red or green phosphor for converting the blue (B) light into a color of a unit pixel may form a layer on one side of the blue semiconductor light emitting element.

The above-described fabricating method or structure of the display device using the semiconductor light emitting element may be modified into various forms. For example, the above-described display device may employ a vertical semiconductor light emitting element.

Furthermore, a modification or embodiment described in the following may use the same or similar reference numbers for the same or similar configurations of the former example and the former description may apply thereto.

FIG.7is a perspective diagram of a display device using a semiconductor light emitting element according to another embodiment of the present disclosure,FIG.8is a cross-sectional diagram taken along a cutting line D-D shown inFIG.8, andFIG.9is a conceptual diagram showing a vertical type semiconductor light emitting element shown inFIG.8.

Referring to the present drawings, a display device may employ a vertical semiconductor light emitting device of a Passive Matrix (PM) type.

The display device includes a substrate210, a first electrode220, a conductive adhesive layer230, a second electrode240and at least one semiconductor light emitting element250.

The substrate210is a wiring substrate on which the first electrode220is disposed and may contain polyimide (PI) to implement a flexible display device. Besides, the substrate210may use any substance that is insulating and flexible.

The first electrode210is located on the substrate210and may be formed as a bar type electrode that is long in one direction. The first electrode220may be configured to play a role as a data electrode.

The conductive adhesive layer230is formed on the substrate210where the first electrode220is located. Like a display device to which a light emitting device of a flip chip type is applied, the conductive adhesive layer230may include one of an Anisotropic Conductive Film (ACF), an anisotropic conductive paste, a conductive particle contained solution and the like. Yet, in the present embodiment, a case of implementing the conductive adhesive layer230with the anisotropic conductive film is exemplified.

After the conductive adhesive layer has been placed in the state that the first electrode220is located on the substrate210, if the semiconductor light emitting element250is connected by applying heat and pressure thereto, the semiconductor light emitting element250is electrically connected to the first electrode220. In doing so, the semiconductor light emitting element250is preferably disposed to be located on the first electrode220.

If heat and pressure is applied to an anisotropic conductive film, as described above, since the anisotropic conductive film has conductivity partially in a thickness direction, the electrical connection is established. Therefore, the anisotropic conductive film is partitioned into a conductive portion and a non-conductive portion.

Furthermore, since the anisotropic conductive film contains an adhesive component, the conductive adhesive layer230implements mechanical coupling between the semiconductor light emitting element250and the first electrode220as well as mechanical connection.

Thus, the semiconductor light emitting element250is located on the conductive adhesive layer230, via which an individual pixel is configured in the display device. As the semiconductor light emitting element250has excellent luminance, an individual unit pixel may be configured in small size as well. Regarding a size of the individual semiconductor light emitting element250, a length of one side may be equal to or smaller than 80 μm for example and the individual semiconductor light emitting element250may include a rectangular or square element. For example, the rectangular element may have a size equal to or smaller than 20 μm×80 μm.

The semiconductor light emitting element250may have a vertical structure.

Among the vertical type semiconductor light emitting elements, a plurality of second electrodes240respectively and electrically connected to the vertical type semiconductor light emitting elements250are located in a manner of being disposed in a direction crossing with a length direction of the first electrode220.

Referring toFIG.9, the vertical type semiconductor light emitting element250includes a p-type electrode256, a p-type semiconductor layer255formed on the p-type electrode256, an active layer254formed on the p-type semiconductor layer255, an n-type semiconductor layer253formed on the active layer254, and an n-type electrode252formed on then-type semiconductor layer253. In this case, the p-type electrode256located on a bottom side may be electrically connected to the first electrode220by the conductive adhesive layer230, and the n-type electrode252located on a top side may be electrically connected to a second electrode240described later. Since such a vertical type semiconductor light emitting element250can dispose the electrodes at top and bottom, it is considerably advantageous in reducing a chip size.

Referring toFIG.8again, a phosphor layer280may formed on one side of the semiconductor light emitting element250. For example, the semiconductor light emitting element250may include a blue semiconductor light emitting element251emitting blue (B) light, and a phosphor layer280for converting the blue (B) light into a color of a unit pixel may be provided. In this regard, the phosphor layer280may include a red phosphor281and a green phosphor282configuring an individual pixel.

Namely, at a location of configuring a red unit pixel, the red phosphor281capable of converting blue light into red (R) light may be stacked on a blue semiconductor light emitting element. At a location of configuring a green unit pixel, the green phosphor282capable of converting blue light into green (G) light may be stacked on the blue semiconductor light emitting element. Moreover, the blue semiconductor light emitting element may be singly usable for a portion that configures a blue unit pixel. In this case, the unit pixels of red (R), green (G) and blue (B) may configure a single pixel.

Yet, the present disclosure is non-limited by the above description. In a display device to which a light emitting element of a flip chip type is applied, as described above, a different structure for implementing blue, red and green may be applicable.

Regarding the present embodiment again, the second electrode240is located between the semiconductor light emitting elements250and connected to the semiconductor light emitting elements electrically. For example, the semiconductor light emitting elements250are disposed in a plurality of columns, and the second electrode240may be located between the columns of the semiconductor light emitting elements250.

Since a distance between the semiconductor light emitting elements250configuring the individual pixel is sufficiently long, the second electrode240may be located between the semiconductor light emitting elements250.

The second electrode240may be formed as an electrode of a bar type that is long in one direction and disposed in a direction vertical to the first electrode.

In addition, the second electrode240and the semiconductor light emitting element250may be electrically connected to each other by a connecting electrode protruding from the second electrode240. Particularly, the connecting electrode may include a n-type electrode of the semiconductor light emitting element250. For example, the n-type electrode is formed as an ohmic electrode for ohmic contact, and the second electrode covers at least one portion of the ohmic electrode by printing or deposition. Thus, the second electrode240and the n-type electrode of the semiconductor light emitting element250may be electrically connected to each other.

Referring toFIG.8again, the second electrode240may be located on the conductive adhesive layer230. In some cases, a transparent insulating layer (not shown) containing silicon oxide (SiOx) and the like may be formed on the substrate210having the semiconductor light emitting element250formed thereon. If the second electrode240is placed after the transparent insulating layer has been formed, the second electrode240is located on the transparent insulating layer. Alternatively, the second electrode240may be formed in a manner of being spaced apart from the conductive adhesive layer230or the transparent insulating layer.

If a transparent electrode of Indium Tin Oxide (ITO) or the like is sued to place the second electrode240on the semiconductor light emitting element250, there is a problem that ITO substance has poor adhesiveness to an n-type semiconductor layer. Therefore, according to the present disclosure, as the second electrode240is placed between the semiconductor light emitting elements250, it is advantageous in that a transparent electrode of ITO is not used. Thus, light extraction efficiency can be improved using a conductive substance having good adhesiveness to an n-type semiconductor layer as a horizontal electrode without restriction on transparent substance selection.

Referring toFIG.8again, a partition290may be located between the semiconductor light emitting elements250. Namely, in order to isolate the semiconductor light emitting element250configuring the individual pixel, the partition290may be disposed between the vertical type semiconductor light emitting elements250. In this case, the partition290may play a role in separating the individual unit pixels from each other and be formed with the conductive adhesive layer230as an integral part. For example, by inserting the semiconductor light emitting element250in an anisotropic conductive film, a base member of the anisotropic conductive film may form the partition.

In addition, if the base member of the anisotropic conductive film is black, the partition290may have reflective property as well as a contrast ratio may be increased, without a separate block insulator.

For another example, a reflective partition may be separately provided as the partition190. The partition290may include a black or white insulator depending on the purpose of the display device.

In case that the second electrode240is located right onto the conductive adhesive layer230between the semiconductor light emitting elements250, the partition290may be located between the vertical type semiconductor light emitting element250and the second electrode240each. Therefore, an individual unit pixel may be configured using the semiconductor light emitting element250. Since a distance between the semiconductor light emitting elements250is sufficiently long, the second electrode240can be placed between the semiconductor light emitting elements250. And, it may bring an effect of implementing a flexible display device having HD image quality.

In addition, as shown inFIG.8, a black matrix291may be disposed between the respective phosphors for the contrast ratio improvement. Namely, the black matrix291may improve the contrast between light and shade.

In the display device using the semiconductor light-emitting element of the present disclosure described above, the semiconductor light-emitting element grown on a wafer is placed on a wiring substrate in the flip-chip form and used as an individual pixel.

FIG.10is a schematic layout illustrating a display device using a semiconductor light emitting element to which the present disclosure is applicable.

FIG.11is a cross-sectional diagram along a line a-b shown inFIG.10.

Referring toFIG.10andFIG.11, a display device300using a semiconductor light emitting element may have a multitude assembly electrodes320located on a substrate310. Such an assembly electrode320may be disposed on the substrate310in a manner that two electrodes321and322are paired with each other.

Red/Green/Blue (R/G/B) pixels may be repeatedly disposed on the substrate310. Referring toFIG.10, pixels in the same color may be located at regular intervals in a manner of being repeated in a horizontal direction.

Here, the assembly electrode320may be disposed to induce Dielectrophoresis (DEP) attributed to an electric field when semiconductor light emitting elements351to353configuring individual pixels are assembled.

In this case, the assembly electrode320may be used for self-assembly of the semiconductor light emitting elements351to353. Here, the self-assembly may mean a process that a plurality of semiconductor light emitting elements351to353grown on a wafer are distributed in fluid by being separated into individual elements and are then assembled on the substrate using an electromagnetic field.

Thus, by Dielectrophoresis (DEP) induced by the assembly electrode320, the semiconductor light emitting elements351to353configuring the individual pixels may be temporarily fixed to pixel areas, respectively.

On the assembly electrode320, an insulating layer330covering the assembly electrode320to insulate may be located.

In addition, on the insulating layer330, a partition wall340for limiting (or defining) an individual pixel area may be formed. Namely, referring toFIG.11, the partition wall340may be formed around the location at which the semiconductor light emitting element351/352/353forming the individual pixel is installed. By the partition wall340, a hall area (i.e., an assembly groove) in which the semiconductor light emitting element351/352/353is installed may be formed.

Therefore, the semiconductor light emitting element351/352/353may be self-assembled and installed in the hall area (assembly groove) formed by the partition wall340.

Yet, in some cases, when the above-described semiconductor light emitting elements351to353are self-assembled, it may happen that the light emitting element is attached to a location other than the individual pixel area, i.e., the hall area. Namely, referring toFIG.10andFIG.11, there may exist a light emitting element354attached to an area other than the hall area formed by the partition wall340.

Particularly, as an inter-electrode distance for self-assembly is narrowed for the downsizing and high-resolution implementation of a Light Emitting Diode (LED) chip, such a phenomenon may increase more. Namely, as an inter-electrode distance and an inter-pixel distance are narrowed, interference of an electric field may occur in an adjacent pixel area. Hence, by the electric field interference, it may more frequently happen that the light emitting element354is attached to a substrate surface of an area other than the assembly groove.

FIG.12is a schematic cross-sectional diagram showing a display device using a semiconductor light emitting element according to a first embodiment of the present disclosure.

Referring toFIG.12, a display device400using a semiconductor light emitting element according to the present embodiment may configure a height different per pixel.

Namely, a step difference layer420may be provided to at least some pixel areas among a multitude of individual pixel areas (assembly grooves). The step difference layer420may be provided to differentiate heights of adjacent pixel areas from each other. Namely, the heights of the assembly grooves in which the light emitting elements are installed may be differentiated from each other by the step difference layer420.

The step difference layer420may include a first step difference layer421forming a pixel area at a first height and a second step difference layer422forming a pixel area at a second height higher than the first height.

Thus, the first step difference layer421and the second step difference layer422may differentiate heights of pixel areas adjacent to each other. Namely, by the first and second step difference layers421and422, a light emitting element formed on the first step difference layer421may differ from a light emitting element formed on the second step difference layer422in height.

In addition, due to the difference layers, a bent area (step shape) may be formed in a space between individual pixel areas in which the light emitting elements are installed. The bent area (step shape) may provide a location at which it is difficult to install a light emitting element that forms an individual pixel. Namely, it may be difficult to self-assemble a light emitting element in the step shape between the individual pixel areas due to the step difference in height. In addition, interference of an electric field in each pixel area may not occur in the step shape between the individual pixel areas.

A multitude of pixel areas may include a red area, a green area and a blue area. Namely, a red light emitting element463may be installed in the red area, a green light emitting element462may be installed in the green area, and a blue light emitting element461may be installed in the blue area.

Thus, a multitude of the individual pixel areas may include the red area, the green area and the blue area, and an assembly side of one of the red, green and blue areas may differ from assembly sides of the rest of the two areas in height owing to the step difference layer420.

In addition, the assembly sides of the areas neighboring each other among the red, green and blue areas may differ from each other in height.

In this case, the heights of the assembly sides of the red, green and blue areas may change sequentially.

Referring toFIG.12, for example, the second step difference layer422may be located in the red area on the substrate410, and the first step difference layer421may be located in the green area neighboring the red area. In this case, the second step difference layer422may be formed on the first step difference layer421(seeFIG.16). In addition, the step difference layer may not be formed in the blue area. In some cases, locations of the red, green and blue areas may be switched to one another.

A pair of the assembly electrodes may be located on the substrate410, the first step difference layer421and the second step difference layer422. For example, a pair of assembly electrodes431and432may be directly located on the substrate in the blue area, a pair of assembly electrodes433and434may be located on the first step difference layer421, and a pair of assembly electrodes435and436may be located on the second step difference layer422in the blue area.

On the above assembly electrode430, insulating layers441,442and443covering the assembly electrode430may be located.

Owing to the above-described first and second step difference layers421and422, the insulating layers441to443may differ from each other in height. Therefore, a step-shaped space may be formed in a neighboring portion of pixel areas, i.e., between the pixel areas by the insulating layers differing from each other in height.

On the insulating layer441/442/443, a partition wall451/452/453defining an assembly groove in which a semiconductor light emitting element forming an individual pixel is mounted may be located.

In this case, the partition wall may include a first partition wall451in smallest height, a second partition wall452in height taller than that of the first partition wall451, and a third partition wall453in height taller than that of the second partition wall452.

In this case, the partition walls451to453may be provided to locations other than the respective assembly grooves, i.e., areas other than the locations at which the light emitting elements forming the individual pixels are installed, in a manner of forming step shapes.

For example, the first partition wall451and the second partition wall452may be located continuously with each other between the blue area and the green area, and the second partition wall452and the third partition wall453may be located continuously with each other between the green area and the red area.

Light emitting elements461to463may be installed in the assembly grooves formed by the partition walls451to453, respectively. In this case, as described above, owing to the step shape formed by the step difference layer420in a manner of being extended to the partition walls451to453, it may be less probable that the light emitting elements461to463are attached to an area other than the assembly grooves.

In addition, a pair of lightning electrodes680(seeFIG.33andFIG.34) electrically connected to each of the light emitting elements461to463may be provided.

A protective layer670(seeFIG.32andFIG.34) may be provided between the lighting electrode680and each of the light emitting elements461to463. The protective layer670may planarize the height difference caused by the step difference layers421and422.

Thus, since the height difference between the pixel areas can prevent the interference effect caused by an electric field between the pixel areas, a light emitting element is prevented from being attached to a substrate surface other than an assembly groove.

Moreover, although such a height difference is not significant, i.e., although there exists a partially interfering electric field, since a surface between pixel areas is not flat (i.e., step shape), ab effect of a magnetic force becomes greater than that of the interfering electric field, a chip may be dragged and attached to an assembly groove in the course of a self-assembly process.

FIG.13is a schematic cross-sectional diagram showing a display device using a semiconductor light emitting element according to a second embodiment of the present disclosure.

Referring toFIG.13, a display device500using a semiconductor light emitting element according to the present embodiment may configure a height different per pixel.

Namely, a step difference layer521may be provided to at least some pixel areas among a multitude of individual pixel areas (assembly grooves). The step difference layer521may be provided to differentiate heights of adjacent pixel areas from each other. Namely, the heights of the assembly grooves in which the light emitting elements are installed may be differentiated from each other by the step difference layer521.

The step difference layer521may be located alternately in pixel areas. For example, as shown inFIG.13, the step difference layer521may exist in a blue area but may not exist in a green area neighboring the blue area. In addition, the step difference layer521may exist in a red area neighboring the green area.

Thus, the step difference layer521may differentiate heights of pixel areas neighboring each other. Namely, owing to the step difference layer521, a height of a light emitting element installed in an assembly groove may be different from that of a light emitting element installed on a neighboring assembly groove.

In addition, due to the difference layers, a bent area (step shape) may be formed in a space between individual pixel areas in which the light emitting elements are installed. The bent area (step shape) may provide a location at which it is difficult to install a light emitting element that forms an individual pixel. Namely, it may be difficult to self-assemble a light emitting element in the step shape between the individual pixel areas due to the step difference in height. In addition, interference of an electric field in each pixel area may not occur in the step shape between the individual pixel areas.

A multitude of pixel areas may include a red area, a green area and a blue area. Namely, a red light emitting element563may be installed in the red area, a green light emitting element562may be installed in the green area, and a blue light emitting element561may be installed in the blue area.

Thus, a multitude of the individual pixel areas may include the red area, the green area and the blue area, and an assembly side of one of the red, green and blue areas may differ from assembly sides of the rest of the two areas in height owing to the step difference layer521. Namely, assembly sides may be formed alternately in a manner of having different heights, respectively.

In addition, the assembly sides of neighboring areas among the red, green and blue areas may differ from each other in height.

Referring toFIG.13, the step difference layer521may be located in the red area and the blue area on the substrate510but the step difference layer521may not be located in the green area located between the red area and the blue area. In addition, the step difference layer521may not be located in the red area located outside the blue area. Thus, the step difference layer521may be alternately located in each of the pixel areas. In some cases, locations of the red, green and blue areas may be switched to one another.

A pair of the assembly electrodes may be located on the substrate510and the step difference layer521. For example, a pair of assembly electrodes531and532may be directly located on the substrate510in the green area and a pair of assembly electrodes533and534may be located on the step difference layer521in the red area and the blue area. In addition, a pair of assembly electrodes531and532may be directly located on the substrate510in the red area located outside the blue area.

On the above assembly electrode530, insulating layers541and542covering the assembly electrode530may be located.

Owing to the above-described step difference layer521, the insulating layers541and541may differ from each other in height. Therefore, a step-shaped space may be formed in a neighboring portion of pixel areas, i.e., between the pixel areas by the insulating layers differing from each other in height.

On the insulating layer541/542, a partition wall551/552defining an assembly groove in which a semiconductor light emitting element forming an individual pixel is mounted may be located.

In this case, the partition wall may include a first partition wall551in smallest height and a second partition wall552in height taller than that of the first partition wall551.

In this case, the partition walls551and552may be provided to locations other than the respective assembly grooves, i.e., areas other than the locations at which the light emitting elements forming the individual pixels are installed, in a manner of forming step shapes.

Light emitting elements561to563may be installed in the assembly grooves formed by the partition walls551and552, respectively. In this case, as described above, owing to the step shape formed by the step difference layer521in a manner of being extended to the partition walls551and552, it may be less probable that the light emitting elements561to563are attached to an area other than the assembly grooves.

In addition, a pair of lightning electrodes660(seeFIG.33andFIG.34) electrically connected to each of the light emitting elements561to563may be provided.

A protective layer670(seeFIG.32andFIG.34) may be provided between the lighting electrode680and each of the light emitting elements561to563. The protective layer670may planarize the height difference caused by the step difference layers521.

Thus, since the height difference between the pixel areas can prevent the interference effect caused by an electric field between the pixel areas, a light emitting element is prevented from being attached to a substrate surface other than an assembly groove.

Moreover, although such a height difference is not significant, i.e., although there exists a partially interfering electric field, since a surface between pixel areas is not flat (i.e., step shape), ab effect of a magnetic force becomes greater than that of the interfering electric field, a chip may be dragged and attached to an assembly groove in the course of a self-assembly process.

FIGS.14to19are schematic cross-sectional diagrams showing a process for fabricating a display device using a semiconductor light emitting element according to a first embodiment of the present disclosure.

Hereinafter, with reference toFIGS.14to19, a process for fabricating a display device using a semiconductor light emitting element according to a first embodiment of the present disclosure will be described step by step.

Referring toFIG.14, the following description will be made by taking an example that three pixel areas P1to P3are defined on a substrate410. The three areas may correspond to a red area P1, a green area P2and a blue area P3, respectively, by which the present disclosure is non-limited.

Referring toFIG.15andFIG.16, a step difference layer420may be formed on the substrate410. Specifically, referring toFIG.15, a first step difference layer421may be formed on the substrate410. As shown in the drawing, the first step difference layer421may be formed on two pixel areas Pa and P2among the three pixel areas P1to P3.

Subsequently, as shown inFIG.16, a second step difference layer422may be formed on the first step difference layer421. As shown in the drawing, the second step difference layer422may be formed on the red area P1only. Hence, the red area P1, the green area P2and the blue area P3may be formed in a step shape to have sequential heights, respectively.

Referring toFIG.17, an assembly electrode430may be formed on the substrate410, the first step difference layer421and the second step difference layer422.

Namely, a pair of assembly electrodes431and432, a pair of assembly electrodes433and434and a pair of assembly electrodes435and436may be formed on the substrate410, the first step difference layer421and the second step difference layer422, respectively.

Referring toFIG.18, an insulating layer440may be formed to cover the assembly electrodes431/432,433/434and435/436. The insulating layer440may be formed on each of the substrate410, the first step difference layer421and the second step difference layer422. Namely, a first insulating layer441may be located on the substrate410, a second insulating layer442may be located on the first step difference layer421, and a third insulating layer443may be formed on the second step difference layer422.

In this case, an assembly side may be formed between each pair of the assembly electrodes431/432,433/434and435/436. Namely, a light emitting element may be assembled between each pair of the assembly electrodes431and432,433and434, and435and436.

Thereafter, referring toFIG.19, partition walls451to453defining assembly grooves, in which light emitting elements configuring individual pixels are installed, may be formed on the insulating layer440.

By the partition walls451to453, the assembly grooves454to456may be defined. Light emitting elements may be installed in the assembly grooves454to456, respectively. For example, a blue light emitting element may be installed in the first assembly groove454, a green light emitting element may be installed in the second assembly groove455, and a red light emitting element may be installed in the third assembly groove456.

In some implementations, the partition walls451to453may be formed in a manner of differing from each other in height. Namely, the partition wall may include a first partition wall451formed on the side of the first assembly groove454, a second partition wall452formed on the side of the second assembly groove455, and a third partition wall453formed on the side of the third assembly groove456.

In this case, owing to the height differences among the partition walls451to453, a portion having a height difference exists in an area other than the assembly grooves454to456. For example, a step difference is generated from an area between the first assembly groove454and the second assembly groove455by the first partition wall451and the second partition wall452.

As described above, the interference effect of enabling an electric field to work between pixel areas can be prevented owing to the height difference of an assembly side of each pixel area, thereby preventing an effect that a light emitting element is attached to a substrate surface other than an assembly groove.

In addition, even though the height difference is not significant, that is, even if some interfering electric fields exist, since a surface between the pixel areas is not flat (step shape), influence of a magnetic force becomes greater than that of the interfering electric field, so that a chip may be dragged and attached to an assembly groove in the course of a self-assembly process.

FIGS.20to24are schematic cross-sectional diagrams showing a process for fabricating a display device using a semiconductor light emitting element according to a second embodiment of the present disclosure.

Hereinafter, with reference toFIGS.20to24, a process for fabricating a display device using a semiconductor light emitting element according to a second embodiment of the present disclosure will be described step by step.

Referring toFIG.20, the following description will be made by taking an example that three pixel areas P1to P3are defined on a substrate510. The three areas may correspond to a red area P1, a green area P2and a blue area P3, respectively, by which the present disclosure is non-limited.

Referring toFIG.21, a step difference layer520may be formed on the substrate510. Specifically referring toFIG.21, a step difference layer521may be formed on each of the two pixel areas P1and P2of the substrate510. Thus, by the step difference layer520, the red area P1, the green area P2and the blue area P3may be formed in a step shape to have different heights alternately. In this case, the height of the red area P1may be equal to that of the blue area P3. Moreover, the green area P2may have the same height of the red area neighboring the blue area P3.

Referring toFIG.22, an assembly electrode530may be formed on the substrate510and the step difference layer520.

Namely, a pair of assembly electrodes531and532and a pair of assembly electrodes533and534may be formed on the substrate410and each of the step difference layers521, respectively.

Referring toFIG.23, an insulating layer540may be formed to cover the assembly electrodes531/532and533/534. The insulating layer540may be formed on each of the substrate410and the step difference layer520. Namely, a first insulating layer541may be located on the substrate510and a second insulating layer542may be formed on the individual step difference layer521.

In this case, an assembly side may be formed between each pair of the assembly electrodes531/532and533/534. Namely, a light emitting element may be assembled between each pair of the assembly electrodes531/532and533/534.

Thereafter, referring toFIG.24, a partition wall550defining an assembly groove, in which a light emitting element configuring an individual pixel is installed, may be formed on the insulating layer540.

Such partition walls551and552may be formed on the first insulating layer541and the second insulating layer542, respectively, and the assembly grooves may be defined by the partition walls551and552, respectively. A light emitting device may be installed in each of the assembly grooves.

In some implementations, the partition walls551and552may be formed in a manner of differing from each other in height. Namely, the partition wall may include a first partition wall551formed on the first insulating layer541and a second partition wall552formed on the second insulating layer542.

In this case, due to the height difference between the partition walls551and552, there exists a height difference generated portion exists in an area other than each assembly groove.

As described above, the interference effect of enabling an electric field to work between pixel areas can be prevented owing to the height difference of an assembly side of each pixel area, thereby preventing an effect that a light emitting element is attached to a substrate surface other than an assembly groove.

In addition, even though the height difference is not significant, that is, even if some interfering electric fields exist, since a surface between the pixel areas is not flat (step shape), influence of a magnetic force becomes greater than that of the interfering electric field, so that a chip may be dragged and attached to an assembly groove in the course of a self-assembly process.

The above description of the first embodiment may exactly apply to the parts failing to be described in the second embodiment.

FIGS.25to33are perspective diagrams showing a process for fabricating a display device using a semiconductor light emitting element according to a third embodiment of the present disclosure.

Hereinafter, with reference toFIGS.25to33, a process for fabricating a display device using a semiconductor light emitting element according to a third embodiment of the present disclosure will be described step by step.

Referring toFIG.25, the following description will be made by taking an example that three pixel areas are formed on a substrate610. The three areas may correspond to a red area, a green area and a blue area, respectively, by which the present disclosure is non-limited.

As shown inFIG.25, a lightning electrode660may be formed on a substrate610. The lightning electrode660may be connected to a light emitting element assembled in a pixel area later. Namely, current is applied through the lightning electrode660, whereby the light emitting element can emit light.

Thus, three pairs of lightning electrodes661/662,663/664and665/666capable of assembling three light emitting elements may be formed on the substrate610.

Referring toFIG.26, an insulating layer670covering the three pairs of lightning electrodes661/662,663/664and665/666may be formed on the substrate610.

Referring toFIG.27, a step difference layer620may be formed on the insulating layer670. Specifically, a first step difference layer621and a second step difference layer622located on the first step difference layer621may be formed on the substrate670.

As shown in the drawing, the first step difference layer621may be formed on two pixel areas P1and P2among three pixel areas P1to P3.

In addition, the second step difference layer622may be formed in the single pixel area P1on the first step difference layer621only. Hence, the respective pixel areas may be formed in a step shape to have sequential heights, respectively.

Referring toFIG.28, an assembly electrode630may be formed on the insulating layer670, the first step difference layer621and the second step difference layer630.

Namely, three pairs of assembly electrodes631/632,633/634and635/636may be formed on the insulating layer670, the first step difference layer621and the second step difference layer630, respectively.

Referring toFIG.29, an insulating layer covering the assembly electrodes631/632,633/634and635/636may be formed. The insulating layer640may be formed on each of the insulating layer670, the first step difference layer621and the second step difference layer630. Namely, a first insulating layer641is located on the insulating layer,670, a second insulating layer642may be located on the first step difference layer621, and a third insulating layer643may be located on the second step difference layer622.

In this case, an assembly side may be formed between each of the pairs of thee assembly electrodes631/632,633/634and635/636. Namely, a light emitting element may be assembled between each of the pairs of the assembly electrodes631/632,633/634and635/636.

Referring toFIG.30, partition wall650(seeFIG.34) defining an assembly groove650, in which a light emitting element configuring an individual pixel is installed, may be formed on the insulating layer6440. For clarity of description, the partition wall is omitted. By the partition wall650, each of assembly grooves651to653may be defined.

Referring toFIG.31, a light emitting element690may be installed in each of the assembly grooves651to653, respectively. For example, a blue light emitting element691may be installed in the first assembly groove651, a green light emitting element692may be installed in the second assembly groove62, and a red light emitting element693may be installed in the third assembly groove653.

Referring toFIG.32, the above-installed light emitting element690is fixed and a protective layer671may be formed. In this case, the protective layer671may planarize a height difference caused by the step difference layer620.

Referring toFIG.33, lighting electrodes681to686may be connected to the light emitting element690. For example, a first electrode685and a second electrode686connected to two electrodes of a red light emitting element693may be formed. And, a first electrode683and a second electrode684connected to two electrodes of a green light emitting element692may be formed. Moreover, a first electrode683and a second electrode684connected to two electrodes of a blue light emitting element691may be formed.

FIG.34is a cross-sectional diagram showing a pixel area shown inFIG.33.

For example,FIG.34shows a cross-sectional structure of an area in which the red light emitting element693is installed. Namely,FIG.34shows a cross-sectional structure of the area in which the red light emitting element693fabricated by the above-described process is installed.

Referring toFIG.34, the lighting electrodes661and662are located on the substrate610, and the insulating layer670covering the lighting electrodes661and662is located thereon.

The step difference layer620is located on the insulating layer670, and the assembly electrode630is located on the step difference layer620.

The insulating layer640is located on the assembly electrode630, and the partition wall650defining the assembly groove of the individual element area is located on the insulating layer640. A top side of the insulating layer640located in the assembly groove may mean an assembly side.

The light emitting element693is installed in the assembly groove, and the protective layer671covering and planarizing the light emitting element693is located.

The first and second electrodes685and686electrically connected to the two electrodes697and699(seeFIG.35) of the light emitting element693are located on the protective layer671. The first and second electrodes685and686may be electrically connected to the lighting electrodes661and662, respectively. For example, the first and second electrodes685and686may be connected to the lighting electrodes661and662via the perforating electrodes667and668, respectively.

As described above, the interference effect of enabling an electric field to work between pixel areas can be prevented owing to the height difference of an assembly side of each pixel area, thereby preventing an effect that a light emitting element is attached to a substrate surface other than an assembly groove.

In addition, even though the height difference is not significant, that is, even if some interfering electric fields exist, since a surface between the pixel areas is not flat (step shape), influence of a magnetic force becomes greater than that of the interfering electric field, so that a chip may be dragged and attached to an assembly groove in the course of a self-assembly process.

FIG.35is a cross-sectional diagram showing one example of a light emitting element used for a display device of the present disclosure.

Referring toFIG.35, one example of a horizontal light emitting element described above with reference toFIG.4is illustrated.

Such a light emitting element690is configured in a manner that a p-type semiconductor layer697is located on an n-type semiconductor layer694. Between the n-type semiconductor layer694and the p-type semiconductor layer697, an active layer (not shown) that emits light is located.

As shown in the drawing, the p-type semiconductor layer697is formed to have a size smaller than that of the n-type semiconductor layer694, and an n-type electrode698is located on the exposed portion. In addition, the p-type semiconductor layer699is located on the n-type semiconductor layer697.

In this case, the p-type electrode699may include a transparent conductive layer such as ITO.

The above description is merely illustrative of the technical spirit of the present disclosure. It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit and scope of the disclosure.

Therefore, the embodiments disclosed in the present disclosure are merely illustrative of the technical spirit of the present disclosure. The scope of the technical spirit of the present disclosure is not limited by these embodiments.

The scope of the present disclosure should be construed by the appended claims, and all technical ideas within the scope equivalent thereto should be construed as being within the scope of the present disclosure.

INDUSTRIAL APPLICABILITY

The present disclosure may provide a light emitting device using a semiconductor light emitting element in size of micrometer (μm) unit.