Patent Description:
In recent years, display devices having excellent characteristics such as low profile, flexibility and the like have been developed in the display technical field. 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 a slow response time, difficult implementation of flexibility in case of LCDs, and there exist drawbacks such as short life span, poor yield as well as low flexibility in case of AMOLEDs. Further, 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 <NUM>, 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.

When a display device using a semiconductor light emitting device is implemented, some semiconductor light emitting devices have defects, and the development for a method of replacing a defective semiconductor light emitting device with a semiconductor light emitting device without any defect has been actively performed. More specifically, when a defect occurs in some semiconductor light emitting devices on a substrate on which a semiconductor light emitting device is disposed, there are two methods for solving the problem.

One method is a replacement repair method in which a defective semiconductor light emitting device is removed, and then a new semiconductor light emitting device is attached thereto. Another method is a redundancy repair method in which two or more cells having redundant cells are disposed in the unit cell, and an electrical connection of an NG cell (i.e., defective semiconductor light emitting device) corresponding to a defective semiconductor light emitting device is cut off, and only the remaining cells included in the unit cell are driven.

In the replacement repair method, the technical difficulty is high, and thus additional facility investment and a separate chip design are required, resulting in an increase in cost. Further, the redundancy repair method is a method of selectively transferring a number of chips greater than twice the number of chips and a chip having a size of at most two times smaller, and the process of selective transfer has high level difficulty.

<CIT> and <CIT> are prior art documents disclosing a repair method for a display in which the wiring electrode is adapted to account for defective LED chips. <CIT> is a prior art document disclosing a replacement repair method for a display, and a LED chip having plural light-emitting regions, found as being less likely to be defective and thus reducing the number of repair and transfer steps when manufacturing a display.

An object of the present disclosure is to provide a novel fabrication process for implementing a flexible display device.

Another object of the present disclosure is to provide a structure capable of easily removing and replacing a defective semiconductor light emitting device using a redundancy repair method.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, the present invention provides in one aspect a display device according to claim <NUM>.

The present invention also provides a corresponding method of manufacturing a display device.

Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by illustration only, since various changes and modifications within the scope of the invention as defined by the appended claims will become apparent to those skilled in the art from this detailed description.

According to the present disclosure having the foregoing configuration, a plurality of semiconductor light emitting devices that share at least one semiconductor layer are included in one unit cell (sub-pixel portion). In other words, the unit cell can be provided with a plurality of semiconductor light emitting devices that share one semiconductor layer other than a plurality of physically separated semiconductor light emitting devices, thereby reducing the complexity of the process of transferring them to a substrate.

Also, an empty space can be provided in the unit cell, and a new semiconductor light emitting device can be disposed in the empty space provided in the unit cell including a defective semiconductor light emitting device. Therefore, even when a defective semiconductor light emitting device is included in the unit cell, the display device according to the present disclosure may additionally arrange a semiconductor light emitting device that can replace the semiconductor light emitting device, thereby facilitating the replacement of the defective semiconductor light emitting device.

In addition, a plurality of semiconductor light emitting devices included in the unit cell and sub-electrodes branched respectively into empty spaces can be provided to remove a defective semiconductor light emitting device or not to perform additional wiring even when a new semiconductor light emitting device is disposed in an empty space, thereby more conveniently removing and replacing the semiconductor light emitting device.

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. 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.

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> is a conceptual view illustrating a display device using a semiconductor light emitting device according to an embodiment of a comparative example not forming part of the invention as claimed. According to the drawing, information processed in the controller of the display device <NUM> can be displayed using a flexible display.

The flexible display includes a flexible, bendable, twistable, foldable and rollable display. For example, the flexible display can 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. In particular, <FIG> is a partial enlarged view of portion "A" in <FIG>, <FIG> are cross-sectional views taken along lines B-B and C-C in <FIG>, <FIG> is a conceptual view illustrating a flip-chip type semiconductor light emitting device in <FIG>, and <FIG> are conceptual views illustrating various forms for implementing colors in connection with a flip-chip type semiconductor light emitting device.

<FIG>, <FIG> illustrate a display device <NUM> using a passive matrix (PM) type semiconductor light emitting device as a display device <NUM> using a semiconductor light emitting device. However, the following illustration is also applicable to an active matrix (AM) type semiconductor light emitting device.

The display device <NUM> includes a substrate <NUM>, a first electrode <NUM>, a conductive adhesive layer <NUM>, a second electrode <NUM>, and a plurality of semiconductor light emitting devices <NUM>. The substrate <NUM> may be a flexible substrate. The substrate <NUM> 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 <NUM> may be either one of transparent and non-transparent materials.

The substrate <NUM> may be a wiring substrate disposed with the first electrode <NUM>, and thus the first electrode <NUM> may be placed on the substrate <NUM>. According to the drawing, an insulating layer <NUM> is disposed on the substrate <NUM> placed with the first electrode <NUM>, and an auxiliary electrode <NUM> is placed on the insulating layer <NUM>. A configuration in which the insulating layer <NUM> is deposited on the substrate <NUM> may be a single wiring substrate. More specifically, the insulating layer <NUM> can be incorporated into the substrate <NUM> with an insulating and flexible material such as polyimide (PI), PET, PEN or the like to form single wiring substrate.

The auxiliary electrode <NUM> as an electrode for electrically connecting the first electrode <NUM> to the semiconductor light emitting device <NUM> is placed on the insulating layer <NUM>, and disposed to correspond to the location of the first electrode <NUM>. For example, the auxiliary electrode <NUM> has a dot shape, and can be electrically connected to the first electrode <NUM> by an electrode hole <NUM> passing through the insulating layer <NUM>. The electrode hole <NUM> can be formed by filling a conductive material in a via hole.

Further, the conductive adhesive layer <NUM> can be formed on one surface of the insulating layer <NUM>, but the comparative example is not limited to this. For example, it is possible to also have a structure in which the conductive adhesive layer <NUM> is disposed on the substrate <NUM> with no insulating layer <NUM>. The conductive adhesive layer <NUM> performs the role of an insulating layer in the structure in which the conductive adhesive layer <NUM> is disposed on the substrate <NUM>.

The conductive adhesive layer <NUM> can be a layer having adhesiveness and conductivity, and a conductive material and an adhesive material can be mixed on the conductive adhesive layer <NUM>. Furthermore, the conductive adhesive layer <NUM> may have flexibility, thereby allowing a flexible function in the display device.

For example, the conductive adhesive layer <NUM> can be an anisotropic conductive film (ACF), an anisotropic conductive paste, a solution containing conductive particles, and the like. The conductive adhesive layer <NUM> allows electrical interconnection in the z-direction passing through the thickness thereof, but can be configured as a layer having electrical insulation in the horizontal x-y direction thereof. Accordingly, the conductive adhesive layer <NUM> can be referred to as a z-axis conductive layer (however, hereinafter referred to as a "conductive adhesive layer").

The anisotropic conductive film includes an anisotropic conductive medium mixed with an insulating base member, and thus when heat and pressure are applied thereto, only a specific portion thereof has conductivity by the anisotropic conductive medium. Hereinafter, heat and pressure are applied to the anisotropic conductive film, but other methods can be also available for the anisotropic conductive film to partially have conductivity. The methods also include applying only either one of heat and pressure thereto, UV curing, and the like.

Furthermore, the anisotropic conductive medium can be conductive balls or particles. In the present embodiment, the anisotropic conductive film includes an anisotropic conductive medium mixed with an insulating base member, and thus when heat and pressure are applied thereto, only a specific portion thereof has conductivity by the conductive balls. The anisotropic conductive film can include a core with a conductive material containing a plurality of particles coated by an insulating layer with a polymer material, and in this instance can have conductivity by the core while breaking an insulating layer on a portion to which heat and pressure are applied. Here, a core can be transformed to implement a layer having both surfaces to which objects contact in the thickness direction of the film.

In 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. In another example, an anisotropic conductive film can include a plurality of particles in which a conductive material is coated on insulating cores. In this instance, a portion to which heat and pressure are applied can be converted (pressed and adhered) to a conductive material to have conductivity in the thickness direction of the film. In still another example, the film can 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 instance, the conductive material may have a pointed end portion.

Further, the anisotropic conductive film can 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 comparative example is not limited to this, and the anisotropic conductive film can 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 can be a paste in which conductive balls are mixed with an insulating and adhesive base material. Furthermore, a solution containing conductive particles can be a solution in a form containing conductive particles or nano particles.

Further, the second electrode <NUM> is located at the insulating layer <NUM> to be separated from the auxiliary electrode <NUM>. In other words, the conductive adhesive layer <NUM> is disposed on the insulating layer <NUM> located with the auxiliary electrode <NUM> and the second electrode <NUM>.

When the conductive adhesive layer <NUM> is formed in a state that the auxiliary electrode <NUM> and second electrode <NUM> are located, and then the semiconductor light emitting device <NUM> is connect thereto in a flip chip form with the application of heat and pressure, the semiconductor light emitting device <NUM> is electrically connected to the first electrode <NUM> and second electrode <NUM>.

Referring to <FIG>, the semiconductor light emitting device <NUM> may be a flip chip type semiconductor light emitting device. For example, the semiconductor light emitting device <NUM> can include a p-type electrode <NUM>, a p-type semiconductor layer <NUM> formed with the p-type electrode <NUM>, an active layer <NUM> formed on the p-type semiconductor layer <NUM>, an n-type semiconductor layer <NUM> formed on the active layer <NUM>, and an n-type electrode <NUM> disposed to be separated from the p-type electrode <NUM> in the horizontal direction on the n-type semiconductor layer <NUM>. In this instance, the p-type electrode <NUM> can be electrically connected to the welding portion <NUM> by the conductive adhesive layer <NUM>, and the n-type electrode <NUM> can be electrically connected to the second electrode <NUM>.

Referring to <FIG>, <FIG> again, the auxiliary electrode <NUM> can be formed in an elongated manner in one direction to be electrically connected to a plurality of semiconductor light emitting devices <NUM>. For example, the left and right p-type electrodes of the semiconductor light emitting devices around the auxiliary electrode can be electrically connected to one auxiliary electrode.

More specifically, the semiconductor light emitting device <NUM> is pressed into the conductive adhesive layer <NUM>, and through this, only a portion between the p-type electrode <NUM> and auxiliary electrode <NUM> of the semiconductor light emitting device <NUM> and a portion between the n-type electrode <NUM> and second electrode <NUM> of the semiconductor light emitting device <NUM> 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 <NUM> constitute a light-emitting array, and a phosphor layer <NUM> 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 <NUM> constitutes a sub-pixel, and is electrically connected to the first electrode <NUM>. For example, there may exist a plurality of first electrodes <NUM>, and the semiconductor light emitting devices are arranged in several rows, for instance, and each row of the semiconductor light emitting devices can be electrically connected to any one of the plurality of first electrodes.

Furthermore, the semiconductor light emitting devices can be connected in a flip chip form, and thus semiconductor light emitting devices grown on a transparent dielectric substrate. In addition, the semiconductor light emitting devices can be nitride semiconductor light emitting devices, for instance. The semiconductor light emitting device <NUM> has an excellent luminance characteristic, and thus it is possible to configure individual sub-pixels even with a small size thereof.

Further, a partition wall <NUM> can be formed between the semiconductor light emitting devices <NUM>. In this instance, the partition wall <NUM> divides individual sub-pixels from one another, and is formed as an integral body with the conductive adhesive layer <NUM>. For example, a base member of the anisotropic conductive film can form the partition wall when the semiconductor light emitting device <NUM> is inserted into the anisotropic conductive film.

When the base member of the anisotropic conductive film is black, the partition wall <NUM> has reflective characteristics while at the same time increasing contrast with no additional black insulator. In another example, a reflective partition wall can be separately provided with the partition wall <NUM>. In this instance, the partition wall <NUM> may include a black or white insulator according to the purpose of the display device. The wall enhances reflectivity when the partition wall of the while insulator is used, and increases contrast while at the same time having reflective characteristics.

The phosphor layer <NUM> can be located at an outer surface of the semiconductor light emitting device <NUM>. For example, the semiconductor light emitting device <NUM> is a blue semiconductor light emitting device that emits blue (B) light, and the phosphor layer <NUM> performs the role of converting the blue (B) light into the color of a sub-pixel. The phosphor layer <NUM> can be a red phosphor layer <NUM> or green phosphor layer <NUM> constituting individual pixels.

In other words, a red phosphor <NUM> capable of converting blue light into red (R) light can be deposited on the blue semiconductor light emitting device <NUM> at a location implementing a red sub-pixel, and a green phosphor <NUM> capable of converting blue light into green (G) light can be deposited on the blue semiconductor light emitting device <NUM> at a location implementing a green sub-pixel. Furthermore, only the blue semiconductor light emitting device <NUM> can be solely used at a location implementing a blue sub-pixel. In this instance, the red (R), green (G) and blue (B) sub-pixels may implement one pixel. More specifically, one color phosphor can be deposited along each line of the first electrode <NUM>. Accordingly, one line on the first electrode <NUM> can be an electrode controlling one color. In other words, red (R), green (B) and blue (B) can be sequentially disposed, thereby implementing sub-pixels.

However, the present comparative example is not limited to this, and the semiconductor light emitting device <NUM> can 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 <NUM> can be disposed between each phosphor layer to enhance contrast. In other words, the black matrix <NUM> can enhance the contrast of luminance. However, the present disclosure is not limited to this, and another structure for implementing blue, red and green can be also applicable thereto.

Referring to <FIG>, each of the semiconductor light emitting devices <NUM> can 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 instance, the semiconductor light emitting device <NUM> can 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 the red, green and blue semiconductor light emitting devices, thereby implementing a full color display.

Referring to <FIG>, the semiconductor light emitting device may have a white light emitting device (W) provided with a yellow phosphor layer for each element. In this instance, a red phosphor layer <NUM>, a green phosphor layer <NUM> and blue phosphor layer <NUM> can 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) can be used to implement a sub-pixel.

<FIG> illustrates a red phosphor layer <NUM>, a green phosphor layer <NUM> and blue phosphor layer <NUM> provided on a ultra violet light emitting device (UV). Thus, the semiconductor light emitting device can be used over the entire region up to ultra violet (UV) as well as visible light, and can be extended to a form of semiconductor light emitting device in which ultra violet (UV) can be used as an excitation source.

Taking the present example into consideration again, the semiconductor light emitting device <NUM> is placed on the conductive adhesive layer <NUM> to configure a sub-pixel in the display device. The semiconductor light emitting device <NUM> has excellent luminance characteristics, and thus it is possible to configure individual sub-pixels even with a small size thereof. The size of the individual semiconductor light emitting device <NUM> may be less than <NUM> 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 <NUM> x <NUM>.

Furthermore, even when a square shaped semiconductor light emitting device <NUM> with a length of side of <NUM> 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 <NUM> in size, and the remaining one side thereof is <NUM>, a relative distance between the semiconductor light emitting devices becomes sufficiently large. Accordingly, it is possible to implement a flexible display device having a HD image quality.

A display device using the foregoing semiconductor light emitting device is fabricated by a fabrication method. Hereinafter, the fabrication method will be described with reference to <FIG>. In particular, <FIG> is cross-sectional views illustrating a method of fabricating a display device using a semiconductor light emitting device according to a comparative example not forming part of the invention as claimed.

As shown, first, the conductive adhesive layer <NUM> is formed on the insulating layer <NUM> located with the auxiliary electrode <NUM> and second electrode <NUM>. The insulating layer <NUM> is deposited on the first substrate <NUM> to form one substrate (or wiring substrate), and the first electrode <NUM>, auxiliary electrode <NUM> and second electrode <NUM> are disposed at the wiring substrate. In this instance, the first electrode <NUM> and second electrode <NUM> can be disposed in a perpendicular direction to each other. Furthermore, the first substrate <NUM> and insulating layer <NUM> may contain glass or polyimide (PI), respectively, to implement a flexible display device.

The conductive adhesive layer <NUM> can be implemented by an anisotropic conductive film, for example, and the anisotropic conductive film can be coated on a substrate located with the insulating layer <NUM>. Next, a second substrate <NUM> located with a plurality of semiconductor light emitting devices <NUM> corresponding to the location of the auxiliary electrodes <NUM> and second electrodes <NUM> and constituting individual pixels is disposed such that the semiconductor light emitting device <NUM> faces the auxiliary electrode <NUM> and second electrode <NUM>.

In this instance, the second substrate <NUM> as a growth substrate for growing the semiconductor light emitting device <NUM> 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 <NUM>. For example, the wiring substrate and second substrate <NUM> can be thermally compressed to each other by applying an ACF press head. The wiring substrate and second substrate <NUM> are bonded to each other using the thermal compression. Only a portion between the semiconductor light emitting device <NUM> and the auxiliary electrode <NUM> and second electrode <NUM> 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 <NUM> to be electrically connected to each other. In addition, the semiconductor light emitting device <NUM> can be inserted into the anisotropic conductive film, thereby forming a partition wall between the semiconductor light emitting devices <NUM>.

Next, the second substrate <NUM> is removed. For example, the second substrate <NUM> can be removed using a laser lift-off (LLO) or chemical lift-off (CLO) method. Finally, the second substrate <NUM> is removed to expose the semiconductor light emitting devices <NUM> to the outside. Silicon oxide (SiOx) or the like can be coated on the wiring substrate coupled to the semiconductor light emitting device <NUM> to form a transparent insulating layer.

The process of forming a phosphor layer on one surface of the semiconductor light emitting device <NUM> can also be included. For example, the semiconductor light emitting device <NUM> can 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 can be modified in various forms. For example, the foregoing display device can be applicable to a vertical semiconductor light emitting device. Hereinafter, the vertical structure will be described with reference to <FIG> and <FIG>.

In addition, 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> is a perspective view illustrating a display device using a semiconductor light emitting device according to another comparative example not forming part of the invention as claimed. In addition, <FIG> is a cross-sectional view taken along line C-C in <FIG> is a conceptual view illustrating a vertical type semiconductor light emitting device in <FIG>. Further, the display device can use a passive matrix (PM) type of vertical semiconductor light emitting device.

The display device includes a substrate <NUM>, a first electrode <NUM>, a conductive adhesive layer <NUM>, a second electrode <NUM> and a plurality of semiconductor light emitting devices <NUM>. The substrate <NUM> as a wiring substrate disposed with the first electrode <NUM> may include polyimide (PI) to implement a flexible display device. In addition, any one can be used if it is an insulating and flexible material.

The first electrode <NUM> is located on the substrate <NUM>, and formed with a bar-shaped electrode elongated in one direction. The first electrode <NUM> can also be formed to perform the role of a data electrode. The conductive adhesive layer <NUM> is formed on the substrate <NUM> located with the first electrode <NUM>. Similarly to a display device to which a flip chip type light emitting device is applied, the conductive adhesive layer <NUM> can be an anisotropic conductive film (ACF), an anisotropic conductive paste, a solution containing conductive particles, and the like. However, the present embodiment illustrates the conductive adhesive layer <NUM> being implemented by an anisotropic conductive film.

When an anisotropic conductive film is located in a state that the first electrode <NUM> is located on the substrate <NUM>, and then heat and pressure are applied to connect the semiconductor light emitting device <NUM> thereto, the semiconductor light emitting device <NUM> is electrically connected to the first electrode <NUM>. In addition, the semiconductor light emitting device <NUM> can be preferably disposed on the first electrode <NUM>.

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 having conductivity and a portion having no conductivity in the thickness direction thereof. Furthermore, the anisotropic conductive film contains an adhesive component, and thus the conductive adhesive layer <NUM> implements a mechanical coupling as well as an electrical coupling between the semiconductor light emitting device <NUM> and the first electrode <NUM>.

Thus, the semiconductor light emitting device <NUM> is placed on the conductive adhesive layer <NUM>, thereby configuring a separate sub-pixel in the display device. The semiconductor light emitting device <NUM> has excellent luminance characteristics, and thus it is possible to configure individual sub-pixels even with a small size thereof. The size of the individual semiconductor light emitting device <NUM> can be less than <NUM> 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 can be less than <NUM> x <NUM>. The semiconductor light emitting device <NUM> can be a vertical structure.

A plurality of second electrodes <NUM> disposed in a direction of crossing the length direction of the first electrode <NUM>, and electrically connected to the vertical semiconductor light emitting device <NUM> can be located between vertical semiconductor light emitting devices.

Referring to <FIG>, the vertical semiconductor light emitting device includes a p-type electrode <NUM>, a p-type semiconductor layer <NUM> formed with the p-type electrode <NUM>, an active layer <NUM> formed on the p-type semiconductor layer <NUM>, an n-type semiconductor layer <NUM> formed on the active layer <NUM>, and an n-type electrode <NUM> formed on the n-type semiconductor layer <NUM>. In this instance, the p-type electrode <NUM> located at the bottom thereof is electrically connected to the first electrode <NUM> by the conductive adhesive layer <NUM>, and the n-type electrode <NUM> located at the top thereof is electrically connected to the second electrode <NUM> which will be described later. The electrodes can be disposed in the upward/downward direction in the vertical semiconductor light emitting device <NUM>, thereby providing a great advantage capable of reducing the chip size.

Referring to <FIG> again, a phosphor layer <NUM> is formed on one surface of the semiconductor light emitting device <NUM>. For example, the semiconductor light emitting device <NUM> is a blue semiconductor light emitting device <NUM> that emits blue (B) light, and the phosphor layer <NUM> for converting the blue (B) light into the color of the sub-pixel can be provided thereon. In this instance, the phosphor layer <NUM> can be a red phosphor <NUM> and a green phosphor <NUM> constituting individual pixels.

In other words, a red phosphor <NUM> capable of converting blue light into red (R) light can be deposited on the blue semiconductor light emitting device <NUM> at a location implementing a red sub-pixel, and a green phosphor <NUM> capable of converting blue light into green (G) light can be deposited on the blue semiconductor light emitting device <NUM> at a location implementing a green sub-pixel. Furthermore, only the blue semiconductor light emitting device <NUM> can be solely used at a location implementing a blue sub-pixel. In this instance, the red (R), green (G) and blue (B) sub-pixels may implement one pixel.

However, the present comparative example is not limited to this, and another structure for implementing blue, red and green can be also applicable thereto as described above in a display device to which a flip chip type light emitting device is applied. In addition, the second electrode <NUM> is located between the semiconductor light emitting devices <NUM>, and electrically connected to the semiconductor light emitting devices <NUM>. For example, the semiconductor light emitting devices <NUM> can be disposed in a plurality of rows, and the second electrode <NUM> can be located between the rows of the semiconductor light emitting devices <NUM>.

Since a distance between the semiconductor light emitting devices <NUM> constituting individual pixels is sufficiently large, the second electrode <NUM> can be located between the semiconductor light emitting devices <NUM>. The second electrode <NUM> can be formed with a bar-shaped electrode elongated in one direction, and disposed in a perpendicular direction to the first electrode.

Furthermore, the second electrode <NUM> is electrically connected to the semiconductor light emitting device <NUM> by a connecting electrode protruded from the second electrode <NUM>. More specifically, the connecting electrode can be an n-type electrode of the semiconductor light emitting device <NUM>. 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 <NUM> can be electrically connected to the n-type electrode of the semiconductor light emitting device <NUM>.

Further, the second electrode <NUM> is located on the conductive adhesive layer <NUM>. In addition, a transparent insulating layer containing silicon oxide (SiOx) can be formed on the substrate <NUM> formed with the semiconductor light emitting device <NUM>. When the transparent insulating layer is formed and then the second electrode <NUM> is placed thereon, the second electrode <NUM> can be located on the transparent insulating layer. Furthermore, the second electrode <NUM> can be formed to be separated from the conductive adhesive layer <NUM> or transparent insulating layer.

If a transparent electrode such as indium tin oxide (ITO) is used to locate the second electrode <NUM> on the semiconductor light emitting device <NUM>, the ITO material has a problem of bad adhesiveness with an n-type semiconductor. Accordingly, the second electrode <NUM> can be placed between the semiconductor light emitting devices <NUM>, 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 can be used as a horizontal electrode without being restricted by the selection of a transparent material, thereby enhancing the light extraction efficiency.

Further, a partition wall <NUM> can be formed between the semiconductor light emitting devices <NUM>. In other words, the partition wall <NUM> can be disposed between the vertical semiconductor light emitting devices <NUM> to isolate the semiconductor light emitting device <NUM> constituting individual pixels. In this instance, the partition wall <NUM> may perform the role of dividing individual sub-pixels from one another, and be formed as an integral body with the conductive adhesive layer <NUM>. For example, a base member of the anisotropic conductive film may form the partition wall when the semiconductor light emitting device <NUM> is inserted into the anisotropic conductive film.

In addition, when the base member of the anisotropic conductive film is black, the partition wall <NUM> has reflective characteristics while at the same time increasing contrast with no additional black insulator. In another example, a reflective partition wall can be separately provided with the partition wall <NUM>. In this instance, the partition wall <NUM> may include a black or white insulator according to the purpose of the display device.

If the second electrode <NUM> is precisely located on the conductive adhesive layer <NUM> between the semiconductor light emitting devices <NUM>, the partition wall <NUM> can be located between the semiconductor light emitting device <NUM> and second electrode <NUM>. Accordingly, individual sub-pixels can be configured even with a small size using the semiconductor light emitting device <NUM>, and a distance between the semiconductor light emitting devices <NUM> can be relatively sufficiently large to place the second electrode <NUM> between the semiconductor light emitting devices <NUM>, thereby having the effect of implementing a flexible display device having a HD image quality.

Further, a black matrix <NUM> can be disposed between each phosphor layer to enhance contrast. In other words, the black matrix <NUM> can enhance the contrast of luminance. As described above, the semiconductor light emitting device <NUM> is located on the conductive adhesive layer <NUM>, thereby constituting individual pixels on the display device. Since the semiconductor light emitting device <NUM> has excellent luminance characteristics, thereby configuring individual sub-pixels even with a small size thereof. As a result, it is 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.

Further, in a display device having a semiconductor light emitting device, there may exist defects in at least some of the semiconductor light emitting devices. Such a defective semiconductor light emitting device can be referred to as a NG cell, and the present disclosure provides a semiconductor light emitting device structure having a novel structure for more easily replacing a semiconductor light emitting device corresponding to a NG cell, and a display device having the same.

In particular, according to the present disclosure, an extra space in which a plurality of light emitting portions and a semiconductor light emitting device can be additionally disposed is arranged in one sub-pixel portion. Furthermore, a redundancy repair method in which an NG cell corresponding to a defective light emitting portion is disconnected to drive only the remaining light emitting portions included in the sub-pixel portion is provided.

Here, the light emitting portion may denote one semiconductor light emitting device. According to the present invention, one semiconductor light emitting device shares a conductive semiconductor layer with another semiconductor light emitting device, which will be described in more detail below.

Hereinafter, a display device to which the redundancy repair method is applied will be described in detail with reference to the accompanying drawings. In particular, <FIG> are enlarged views illustrating a portion A in <FIG> illustrating an embodiment according to the invention to which the semiconductor light emitting device having a novel structure according to the present disclosure is applied. <FIG> are conceptual views illustrating a semiconductor light emitting device according to the present invention.

<FIG> illustrate a display device <NUM> using an active matrix (AM) type semiconductor light emitting device is illustrated. However, an example described below can also be applicable to a passive matrix (PM) type semiconductor light emitting device.

The display device <NUM> includes a plurality of semiconductor light emitting devices <NUM> on a substrate <NUM> and a sub-pixel portion <NUM>. The substrate <NUM> is a thin film transistor array substrate, and can be made of a glass or a plastic material. The substrate <NUM> includes a first and a second electrode portion <NUM>, <NUM> for supplying power to the sub-pixel portion <NUM>.

Furthermore, the substrate <NUM> includes a driving portion <NUM> for controlling power supply and data signal transmission to the sub-pixel portion <NUM>, and the driving portion <NUM> is electrically connected to the sub-pixel portion <NUM> through the first and the second electrode portion <NUM>, <NUM>. The driving portion <NUM> can be a driving thin film transistor, and can be various types of switching devices. In the drawing according to the present specification, the driving portion <NUM> is schematically shown, and one driving portion <NUM> can supply driving power to one sub-pixel portion <NUM> to perform control in the unit of the sub-pixel portion <NUM>.

A plurality of gate lines (GLs), a plurality of data lines (DLs), a plurality of driving power lines (PLs), and a plurality of common power lines (CLs) can be disposed on the substrate <NUM> for electrical connection between the driving portion <NUM> and the sub-pixel portion <NUM> and supplying driving power thereto, and the detailed description thereof is omitted.

Further, the first electrode portion <NUM> can be configured to perform the role of a common electrode and a common power line, and the second electrode portion <NUM> can be configured to perform the role of a data electrode and a data line (DL). They can also be configured to perform opposite roles.

In addition, the sub-pixel portion <NUM> is a minimum unit region in which light is actually emitted, is formed to emit light of the same color, and is formed to have a first and a second light emitting portion 1050a, 1050b spaced apart with a groove therebetween. At least three sub-pixel portions adjacent to one another may constitute one unit pixel (or unit picture element) for color display. For example, one unit pixel may include a red sub-pixel portion, a green sub-pixel portion, and a blue sub-pixel portion adjacent to one another, and may further include a white pixel for luminance enhancement.

Moreover, a phosphor layer <NUM> can be located on an outer surface of the sub-pixel portion <NUM>. For example, a light emitting portion, that is, semiconductor light emitting device, included in the sub-pixel portion <NUM> is a blue semiconductor light emitting device that emits blue (B) light, and the phosphor layer <NUM> performs a function of converting the blue(B) light into a color of the pixel. The phosphor layer <NUM> can be a red phosphor <NUM> or a green phosphor <NUM> constituting an individual pixel.

In other words, a red phosphor <NUM> capable of converting blue light into red (R) light can be deposited on a first sub-pixel portion at a position forming a red unit pixel, and a green phosphor <NUM> capable of converting blue light into green (G) light can be deposited on a second sub-pixel portion adjacent to the first sub-pixel portion at a position forming a green unit pixel. In addition, only a blue semiconductor light emitting device can be used solely in a portion constituting a blue unit pixel. The red (R), green (G) and blue (B) sub-pixel portions can form one pixel.

More specifically, as illustrated in <FIG>, one color of phosphor can be deposited along the column direction. In this instance, a phosphor layer of the same color is coated on one sub-pixel portion <NUM>, and therefore, the phosphors of the same material can be deposited on the light emitting portions provided in the sub-pixel portion, the first and second light emitting portions, to convert light output from the first and second light emitting portions into the same color.

Moreover, as illustrated in the drawings, the phosphor layer may also be formed to be deposited in the repair site 1050c. However, the present disclosure is not limited thereto, and instead of the phosphors, the semiconductor light emitting device <NUM> and the quantum dot (QD) can be combined to form red (R), green (G) and blue (B) unit pixels.

In addition, a black matrix <NUM> can be disposed between each of the phosphor layers in order to enhance contrast. In other words, the black matrix <NUM> can enhance the contrast of light and dark. However, the present disclosure is not limited thereto, and other structures for implementing blue, red and green may also be applied thereto.

Hereinafter, the sub-pixel portion <NUM> according to the present invention will be described in more detail. As described above, the sub-pixel portion <NUM> includes an empty space (or a repair site) 1050c in which 1050a, 1050b and an additional light emitting portion (or semiconductor light emitting device) can be disposed.

<FIG> illustrate the sub-pixel portion <NUM> includes two light emitting portions 1050a, 1050b, but the present disclosure is not limited thereto, and a larger number of light emitting portions can be provided in the sub-pixel portion <NUM>. The light emitting portion may also be referred to as a semiconductor light emitting device.

The sub-pixel portion according to the present embodiment is configured to have an undoped semiconductor layer <NUM>, and the first and the second light emitting portion 1050a, 1050b are respectively formed to be deposited on the undoped semiconductor layer <NUM> with a groove therebetween. In other words, the first and the second light emitting portion 1050a, 1050b can be spaced apart from each other on the undoped semiconductor layer <NUM>.

Further, the second electrode portion <NUM> or wiring electrode includes a base electrode <NUM>-<NUM> for transmitting the same electric signal to the first and the second light emitting portion 1050a, 1050b, a first sub-electrode 1040a extended from the base electrode <NUM>-<NUM> and electrically connected to the first light emitting portion 1050a, and a second sub-electrode 1040b extended from the base electrode <NUM>-<NUM> and electrically connected to the second light emitting portion 1050b.

Moreover, the wiring electrode (or second electrode portion <NUM>) may further include a third sub-electrode 1040c extended from the base electrode <NUM>-<NUM> toward the repair site 1050c. The sub-electrodes provided on the wiring electrode can be provided in proportion to a number of the light emitting portions and a number of the repair sites provided in the sub-pixel portion.

The same data signal is transmitted to the first through third sub-electrodes 1040a, 1040b, 1040c, respectively, and the light emitting portions provided in the sub-pixel portion <NUM> can emit light based on the same data signal. Further, the first and the second sub-electrode 1040a, 1040b are extended from the base electrode <NUM>-<NUM> and electrically connected to the respective light emitting portions, and in particular, electrically connected to an electrode provided on a specific conductive semiconductor layer provided in each light emitting portion.

The light emitting portion provided in the sub-pixel portion can have various structures, and as illustrated in <FIG>, the first and the second light emitting portion 1050a, 1050b deposited on the undoped semiconductor layer <NUM> respectively include a first and a second conductive semiconductor layer 1053a, 1053b, 1055a, 1055b, and an active layer 1054a,1054b formed between the first and the second conductive semiconductor layer 1053a, 1053b, 1055a, 1055b. Moreover, a first conductive electrode 1052a,1052b is formed on one surface of the first conductive semiconductor layer 1053a,1053b, and a second conductive electrode 1056a, 1056b is formed on one surface of the second conductive semiconductor layer 1055a, 1055b.

The undoped semiconductor layer <NUM> can be formed on one surface of the first conductive semiconductor layer 1053a, 1053b, and the active layer 1054a, 1054b can be etched on the other surface thereof. Further, the first conductive electrode 1052a, 1052b can be formed on at least part of the first conductive semiconductor layer 1053a, 1053b on which the undoped semiconductor layer <NUM> is formed. In other words, the undoped semiconductor layer <NUM> may not be formed to cover the first conductive semiconductor layers 1053a, 1053b as a whole, but formed to cover only part thereof.

Also, the first conductive electrode 1052a, 1052b and the first conductive semiconductor layer 1053a, 1053b can be an n-type electrode and an n-type semiconductor layer, respectively, and the second conductive electrode 1056a, 1056b and the second conductive semiconductor layers 1055a, 1055b can be a p-type electrode and a p-type semiconductor layer, respectively. However, the present disclosure is not limited thereto, and the first conductive electrode and the first conductive semiconductor layer can be a p-type electrode and the second conductive electrode and the second conductive semiconductor layer can be an n-type electrode.

In addition, the first conductive electrode 1052a, 1052b of the first and the second light emitting portion 1050a, 1050b can be disposed on both sides with the undoped semiconductor layer <NUM> at the center, as illustrated in the drawing.

As illustrated in <FIG>, the first conductive electrode 1053a included in the first light emitting portion 1050a is electrically connected to the first sub-electrode 1040a, and the first conductive electrode 1053b included in the second light emitting portion 1050b can be electrically connected to the second sub-electrode 1040b. Further, <FIG> illustrates a view in which the light emitting portion (or the semiconductor light emitting device) is not additionally disposed in the repair site 1050c. However, when the light emitting portion is additionally provided in the repair site 1050c, the additionally provided light emitting portion and the third sub-electrode 1040c can be electrically connected to each other.

Further, as described above, a plurality of light emitting portions 1050a, 1050b included in the same sub-pixel portion <NUM> are configured to emit light based on a signal transmitted through a plurality of sub-electrodes 1040a, 1040b that are branched from the base electrode 1040d. As illustrated in <FIG>, the first conductive electrode 1052a included in the first light emitting portion 1050a can be electrically connected to the first sub-electrode 1040a, and the second conductive electrode 1052b included in the second light emitting portion 1050b can be electrically connected to the second sub-electrode 1040b.

As illustrated in <FIG>, in order to remove a light emitting portion corresponding to an NG cell, a laser is irradiated to the undoped semiconductor layer <NUM> to allow the first and the second light emitting portion 1050a, 1050b to be physically separated. Further, laser ablation is used, and through this, a crack can be formed on a cross-section 1059a of the undoped semiconductor layer <NUM> irradiated with the laser as illustrated in <FIG>.

When there is a light emitting portion corresponding to an NG cell, the undoped semiconductor layer <NUM> can be cracked using laser ablation as illustrated in <FIG>, and then the light emitting portion corresponding to the NG cell (for example, the second light emitting portion 1050b including even an undoped semiconductor layer deposited on the second light emitting portion 1050b) can be removed as illustrated in <FIG>.

Then, as illustrated in <FIG>, a new semiconductor light emitting device can be inserted into the repair site 1050c. Thus, the sub-pixel portion <NUM> can be provided with at least two light emitting portions that are free from defects to emit light of the same brightness as that of the other sub-pixel portions <NUM>.

Further, in the above description, an example of removing a defective light emitting portion has been described, but according to the present disclosure, it may also be possible to insert a new semiconductor light emitting device into the repair site while maintaining the defective light emitting portion without removing it.

According to the present invention having the foregoing configuration, a plurality of semiconductor light emitting devices that share at least one semiconductor layer can be included in one unit cell (sub-pixel portion). In other words, the unit cell can be provided with a plurality of semiconductor light emitting devices that share one semiconductor layer other than a plurality of physically separated semiconductor light emitting devices, thereby reducing the complexity of the process of transferring them to a substrate.

In addition, an empty space can be provided in the unit cell, and a new semiconductor light emitting device can be disposed in the empty space provided in the unit cell including a defective semiconductor light emitting device. Therefore, even when a defective semiconductor light emitting device is included in the unit cell, the display device according to the present disclosure can additionally arrange a semiconductor light emitting device that can replace the semiconductor light emitting device, thereby facilitating the replacement of the defective semiconductor light emitting device.

Also, light emitting portions, that is, a semiconductor light emitting device, provided in the sub-pixel portion can be modified into various structures, and examples thereof will be described in detail with reference to the accompanying drawings. In particular, <FIG> are conceptual views illustrating the semiconductor light emitting device of another example according to the invention.

For example, as illustrated in <FIG>, a first and a second light emitting portion 2050a, 2050b can be deposited on an undoped semiconductor layer <NUM>, and may include first conductive semiconductor layers 2053a, 2053b spaced apart from each other, active layers 2054a, 2054b etched on the first conductive semiconductor layers 2053a, 2053b, and second conductive semiconductor layers 2055a, 2055b deposited on the active layers.

The first conductive semiconductor layers, the active layers and the second conductive semiconductor layers 2053a, 2053b, 2054a, 2054b, 2055a, 2055b are spaced apart from each other with a groove therebetween on an undoped semiconductor layer <NUM>. The undoped semiconductor layer <NUM> can be formed on one side of the first conductive semiconductor layers 2053a, 2053b. In addition, first conductive electrodes 2052a, 2052b can be formed on the other side of the first conductive semiconductor layers 2053a, 2053b, respectively.

Moreover, second conductive electrodes 2056a, 2056b are formed on one surface of the second conductive semiconductor layers 2055a, 2055b. Further, the undoped semiconductor layer <NUM> can be formed on one surface of the first conductive semiconductor layers 2053a, 2053b and the active layers 2054a, 2054b can be etched on the other surface thereof.

In addition, the first conductive electrodes 2052a, 2052b can be respectively formed on the other side opposite to one side of the first conductive semiconductor layers 2053a, 2053b on which the undoped semiconductor layer <NUM> is formed. In other words, the undoped semiconductor layer <NUM> may not be formed to entirely cover the first conductive semiconductor layers 2053a, 2053b, but can be formed to cover only part thereof.

As described above, the undoped semiconductor layer <NUM> and the first conductive electrodes 2052a, 2052b can be formed on one surface of the first conductive semiconductor layers 2053a, 2053b, and the active layers 2054a, 2054b can be deposited on the other surface thereof.

Also, the first conductive electrodes 2052a, 2052b and the first conductive semiconductor layers 2053a, 2053b can be n-type electrodes and n-type semiconductor layers, respectively, and the second conductive electrodes 2056a, 2056b and the second conductive semiconductor layers 2055a, 2055b can be p-type electrodes and p-type semiconductor layers, respectively. However, the present disclosure is not limited thereto, and the first conductive electrodes and first conductive semiconductor layers can be p-type electrodes and the second conductive electrodes and second conductive semiconductor layers can be n-type electrodes. Further, the first conductive electrodes 2052a, 2052b can be electrically connected to the sub-electrodes provided in the second electrode portion <NUM> (refer to <FIG>).

In another example, as illustrated in <FIG>, a first and a second light emitting portion 3050a, 3050b can be deposited on an undoped semiconductor layer <NUM>, and can include a first conductive semiconductor layers 3053a, 3053b spaced apart from each other, active layers 3054a, 3054b deposited on the first conductive semiconductor layers 3053a, 3053b, and second conductive semiconductor layers 3055a, 3055b deposited on the active layers.

The first conductive semiconductor layer, the active layers and the second conductive semiconductor layers 3053a, 3053b, 3054a, 3054b, 3055a, 3055b are spaced apart from each other with a groove therebetween on the undoped semiconductor layer <NUM>. Also, the undoped semiconductor layer <NUM> can be formed on one surface of the first conductive semiconductor layers 3053a and 3053b, and the active layers 3054a, 3054b and the first conductive electrodes 3052a, 3052b can be formed on the other surface thereof.

In addition, second conductive electrodes 3056a, 3056b are formed on one surface of the second conductive semiconductor layers 3055a, 3055b. Further, a first and a second conductive electrode 3052a, 3056a of the first light emitting portion 3050a can be spaced apart in a horizontal direction, and similarly, a first and a second conductive electrode 3052b, 3066b of the second light emitting portion 3050b may also be spaced apart in a horizontal direction.

Furthermore, the first conductive electrodes 3052a, 3052b and the first conductive semiconductor layers 3053a, 3053b can be n-type electrodes and n-type semiconductor layers, respectively, and the second conductive electrodes 3056a, 3056b and the second conductive semiconductor layers 3055a, 3055b can be p-type electrodes and p-type semiconductor layers, respectively. However, the present disclosure is not limited thereto, and the first conductive electrodes and first conductive semiconductor layers can be p-type electrodes and the second conductive electrodes and second conductive semiconductor layers can be n-type electrodes. Also, the first conductive electrodes 3052a, 3052b can be electrically connected to the sub-electrodes provided in the second electrode portion <NUM> (refer to <FIG>) as described above.

In addition, according to the above embodiments, light emitting portions that share an undoped semiconductor layer have been described. The display device according to the present disclosure includes a plurality of light emitting portions that share a single conductive semiconductor layer, and hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. <FIG> and <FIG> are enlarged views illustrating a portion A in <FIG> illustrating another embodiment of the present invention to which a semiconductor light emitting device having a novel structure according to another embodiment of the present invention is applied.

Referring to <FIG> and <FIG>, a display device <NUM> using an active matrix (AM) type semiconductor light emitting device as a display device <NUM> using a semiconductor light emitting device is illustrated. However, an example described below may also be applicable to a passive matrix (PM) semiconductor light emitting device.

The display device <NUM> includes a substrate <NUM>, a sub-pixel portion <NUM>, and a plurality of semiconductor light emitting devices <NUM> that form the sub-pixel portion <NUM>. The substrate <NUM> is a thin film transistor array substrate, and can be made of glass or a plastic material. The substrate <NUM> includes a first and a second electrode portion <NUM>, <NUM> for supplying power to the sub-pixel portion <NUM>.

Furthermore, the substrate <NUM> is provided with a driving portion <NUM> for controlling power supply and data signal transmission to the sub-pixel portion <NUM>, and the driving portion <NUM> is formed to be electrically connected to the sub-pixel portion <NUM> through the first and the second electrode portion <NUM>, <NUM>. The driving portion <NUM> can be a driving thin film transistor, and besides, can be various types of switching devices. In the drawing according to the present specification, the driving portion <NUM> is schematically shown, and one driving portion <NUM> may supply driving power to one sub-pixel portion <NUM> to perform control in the unit of the sub-pixel portion <NUM>.

A plurality of gate lines (GLs), a plurality of data lines (DLs), a plurality of driving power lines (PLs), and a plurality of common power lines (CLs) can be disposed on the substrate <NUM> for electrical connection between the driving portion <NUM> and the sub-pixel portion <NUM> and supplying driving power thereto, and the detailed description thereof will be omitted herein.

The first electrode portion <NUM> can be configured to perform the role of a common electrode and a common power line, and the second electrode portion <NUM> can be configured to perform the role of a data electrode and a data line (DL). Furthermore, the electrode portions <NUM> and <NUM> may also be configured to perform opposite roles.

The sub-pixel portion <NUM> according to the present disclosure is a minimum unit region in which light is actually emitted, emits light of the same color, and includes a first and a second light emitting portion 4050a, 4050b spaced apart with a groove therebetween.

At least three sub-pixel portions adjacent to one another may constitute one unit pixel (or unit picture element) for color display. For example, one unit pixel may include a red sub-pixel portion, a green sub-pixel portion, and a blue sub-pixel portion adjacent to one another, and may further include a white pixel for luminance enhancement.

In other words, a red phosphor <NUM> capable of converting blue light into red (R) light can be deposited on a first sub-pixel portion at a position forming a red unit pixel, and a green phosphor <NUM> capable of converting blue light into green (G) light can be deposited on a second sub-pixel portion adjacent to the first sub-pixel portion at a position forming a green unit pixel. In addition, only a blue semiconductor light emitting device can be used solely in a portion constituting a blue unit pixel. In this instance, the red (R), green (G) and blue (B) sub-pixel portions may form one pixel.

Further, the phosphor layer may also be formed to be deposited in the repair site 4050c. However, the present disclosure is not limited thereto, and instead of the phosphors, the semiconductor light emitting device <NUM> and the quantum dot (QD) can be combined to form red (R), green (G) and blue (B) unit pixels. In addition, a black matrix <NUM> can be disposed between each of the phosphor layers in order to enhance contrast. In other words, the black matrix <NUM> may enhance the contrast of light and dark. However, the present disclosure is not limited thereto, and other structures for implementing blue, red and green may also be applied thereto.

Hereinafter, the sub-pixel portion <NUM> according to the present disclosure will be described in more detail. As described above, the sub-pixel portion <NUM> includes an empty space (or a repair site) 4050c in which the first and the second light emitting portion 4050a, 4050b and an additional light emitting portion (or semiconductor light emitting device) can be disposed.

On the drawing, it is illustrated that the sub-pixel portion <NUM> includes two light emitting portions 4050a, 4050b, but the present disclosure is not limited thereto, and a larger number of light emitting portions can be provided in the sub-pixel portion <NUM>. The light emitting portion may also be referred to as a semiconductor light emitting device.

The first and second light emitting portions 4050a, 4050b included in the sub-pixel portion according to the present embodiment according to the invention include a first and a second conductive semiconductor layer <NUM>, 4055a, 4055b, an active layer 4054a, 4054b formed between the first and the second conductive semiconductor layer <NUM>, 4055a, 4055b, a first conductive electrode 4052a, 4052b formed on one surface of the first conductive semiconductor layer <NUM>, and a second conductive electrode 4056a, 4056b formed on one side of the second conductive semiconductor layer 4055a, 4055b, and the first conductive semiconductor layer <NUM> of the first and the second light emitting portion 4050a, 4050b forms a single semiconductor layer.

Therefore, the second conductive semiconductor layer 4055a, the active layer 4054a and the second conductive electrode 4056a of the first light emitting portion 4050a, and the second conductive semiconductor layer 4055b, the active layer 4054b and the second conductive electrode 4056b of the second light emitting portion 4050b are formed on the single first conductive semiconductor layer <NUM> to be spaced apart from each other with a groove therebetween.

The active layer 4054a, 4054b is formed on one surface of the single first conductive semiconductor layer <NUM>, and the first conductive electrode 4052a, 4052b of the first and the second light emitting portion 4050a, 4050b can be respectively provided on the other surface of the single first conductive semiconductor layer <NUM>. The first conductive electrodes 4052a, 4052b are formed at both sides of the other surface of the first conductive semiconductor layer <NUM>, respectively.

Further, the second electrode portion <NUM> or wiring electrode includes a base electrode <NUM>-<NUM> for transmitting the same electric signal to the first and the second light emitting portion 4050a, 4050b, a first sub-electrode 4040a extended from the base electrode <NUM>-<NUM> and electrically connected to the first light emitting portion 4050a, and a second sub-electrode 4040b extended from the base electrode <NUM>-<NUM> and electrically connected to the second light emitting portion 4050b.

Moreover, the wiring electrode (or second electrode portion <NUM>) may further include a third sub-electrode 4040c extended from the base electrode <NUM>-<NUM> toward the repair site 4050c. The sub-electrodes provided on the wiring electrode can be provided in proportion to a number of the light emitting portions and a number of the repair sites provided in the sub-pixel portion.

The same data signal is transmitted to the first through third sub-electrodes 4040a, 4040b, 4040c, respectively, and the light emitting portions provided in the sub-pixel portion <NUM> may emit light based on the same data signal. Further, the first and the second sub-electrode 4040a, 4040b are extended from the base electrode <NUM>-<NUM> and electrically connected to the respective light emitting portions, and electrically connected to an electrode provided on a specific conductive semiconductor layer provided in each light emitting portion.

Further, <FIG> and <FIG> illustrate views in which the light emitting portion (or the semiconductor light emitting device) is not additionally disposed in the repair site 4050c. However, when the light emitting portion is additionally provided in the repair site 4050c, the additionally provided light emitting portion and the third sub-electrode 4040c can be electrically connected to each other.

As described above, a plurality of light emitting portions 4050a, 4050b included in the same sub-pixel portion <NUM> are configured to emit light based on a signal transmitted through a plurality of sub-electrodes 4040a, 4040b that are branched from the base electrode <NUM>-<NUM>. The first conductive electrode 4052a included in the first light emitting portion 4050a can be electrically connected to the first sub-electrode 4040a, and the second conductive electrode 4052b included in the second light emitting portion 4050b can be electrically connected to the second sub-electrode 4040b.

According to a display device according to the present disclosure, in order to remove a light emitting portion corresponding to an NG cell, a laser is irradiated to the single first semiconductor layer <NUM> to allow the first and the second light emitting portion 4050a, 4050b to be physically separated.

In addition, laser ablation is used, and through this, though not shown in the drawing, a crack can be formed on a cross-section 4059a of the first semiconductor layer <NUM> irradiated with the laser. In the display device according to the present disclosure, when there is a light emitting portion corresponding to an NG cell, the single first semiconductor layer <NUM> can be cracked using laser ablation, and then the light emitting portion corresponding to the NG cell can be removed.

Then, a new semiconductor light emitting device can be inserted into the repair site 4050c. Through this, the sub-pixel portion <NUM> can be provided with at least two light emitting portions that are free from defects to emit light of the same brightness as that of the other sub-pixel portions <NUM>. Further, in the above description, an example of removing a defective light emitting portion has been described, but according to the present disclosure, it may also be possible to insert a new semiconductor light emitting device into the repair site while maintaining the defective light emitting portion without removing it.

According to the present embodiment having the foregoing configuration, a plurality of semiconductor light emitting devices that share at least one semiconductor layer can be included in one unit cell (sub-pixel portion). In other words, the unit cell can be provided with a plurality of semiconductor light emitting devices that share one semiconductor layer other than a plurality of physically separated semiconductor light emitting devices, thereby reducing the complexity of the process of transferring them to a substrate.

The present invention encompasses various modifications to each of the examples and embodiments discussed herein, within the scope defined by the appended claims. According to the invention, one or more features described above in one embodiment or example can be equally applied to another embodiment or example described above, within the scope defined by the appended claims. The features of one or more embodiments or examples described above can be combined into each of the embodiments or examples described above, within the scope defined by the appended claims. Any full or partial combination of one or more embodiment or examples of the invention, within the scope defined by the appended claims, is also part of the invention.

Claim 1:
A display device (<NUM>), comprising:
a substrate (<NUM>);
a sub-pixel portion (<NUM>) disposed on the substrate (<NUM>); and
a wiring electrode electrically connected to the sub-pixel portion (<NUM>),
wherein the sub-pixel portion (<NUM>) comprises:
a first light emitting portion (1050a) and a second light emitting portion (1050b) configured to output light of a same color and spaced apart with a groove therebetween,
wherein the wiring electrode comprises:
a base electrode (<NUM>-<NUM>) configured to transmit a same electric signal to the first light emitting portion (1050a) and the second light emitting portion (1050b),
a first sub-electrode (1040a) extended from the base electrode (<NUM>-<NUM>) and electrically connected to the first light emitting portion (1050a), and
a second sub-electrode (1040b) extended from the base electrode (<NUM>-<NUM>) and electrically connected to the second light emitting portion (1050b), and
wherein the first light emitting portion (1050a) and the second light emitting portion (1050b) share at least one semiconductor layer.