Display device using a semiconductor light-emitting element

Abstract

To provide a display device using a micro LED (Light Emitting Diode).SOLUTION: The display device comprises: a wiring board on which a plurality of unit pixels are defined; electrode pads which are arranged on the unit pixel to define a plurality of unit subpixels; and a light-emitting element which has a tilt angle so as to incline a side face to one side, and is electrically connected to the electrode pad. Two adjacent light-emitting elements are arranged symmetrically to the tilt angle. A distance between two adjacent electrode pads is variable.SELECTED DRAWING: Figure 15

Description

Technical Field

[0001] The present invention is applicable to the technical field related to display devices, for example, a display device using micro Light Emitting Diodes (LEDs).

[0002] 〔Related Art〕 This application is accompanied by a claim of priority under Article 4 of the Paris Convention based on Korean Patent Application No. 10-2023-0101829 (filing date: August 3, 2023; DAS: 8163), and the present invention is based on the content disclosed in the Korean patent application. For reference, the contents of the specification, claims, and drawings of the Korean patent application are incorporated into a part of the specification of this application.

Background Art

[0003] Recently, in the field of display technology, display devices having excellent characteristics such as thinness and flexibility have been developed. Currently, the main displays in common use are represented by LCD (Liquid Crystal Display) and OLED (Organic Light Emitting Diodes).

[0004] On the other hand, a Light Emitting Diode (LED) is a semiconductor light-emitting element well known for converting current into light. Since a red LED using a GaAsP compound semiconductor was commercialized in 1962, it has been used as a light source for display images of electronic devices including information and communication devices together with GaP:N-based green LEDs.

[0005] Recently, this Light Emitting Diode (LED) has been gradually miniaturized, fabricated into LEDs of micrometer size, and used as pixels of a display device or for planar lighting.

[0006] Sapphire, which is used as a substrate on which a gallium nitride-based semiconductor grows, has an inclined crystal plane. As an example, the R-plane has a crystal plane inclined with respect to the m-axis. Usually, sapphire has the R-plane as the growth plane. Since the R-plane has a plane inclined with respect to the hexagonal column crystal, the sapphire substrate and the gallium nitride-based semiconductor grown on the crystal plane of the sapphire substrate have such an inclined tilt angle.

[0007] In addition, such a tilt angle is also formed based on the fact that after a light-emitting element is formed of a gallium nitride-based semiconductor on a sapphire substrate, it is cut in the direction of the crystal plane of the sapphire substrate.

[0008] As a result, when the light-emitting element is mounted on a wiring substrate by a general arrangement and emits light, individual sub-pixels are formed in a state having an asymmetric light distribution with respect to the direction of connecting two electrode pads to one light-emitting element, and a display device is formed.

[0009] In this way, when a display device is formed with individual sub-pixels in a state having an asymmetric light distribution, when looking at the display device from the outside, there arises a problem that the hue changes depending on the viewing direction.

[0010] In addition, an unintended parasitic capacitance is generated by an electric field formed by the polarity difference between the signal electrode and the common electrode of the light-emitting element.

[0011] As a result, even when the electric field disappears, the discharge of the parasitic capacitance is not normally performed, and a situation occurs where adjacent light-emitting elements are lit unintentionally.

[0012] This influence accumulates for the entire number of light-emitting elements used in the display device, and finally, a ghost phenomenon occurs in the display product unit.

[0013] Therefore, a solution that can solve such problems is required.

Summary of the Invention

Problems to be Solved by the Invention

[0014] The technical problem to be solved by the present invention is to provide a display device using a semiconductor light-emitting element capable of canceling out the tilted light distribution of the light-emitting element based on the crystallinity of the light-emitting element.

[0015] In addition, when viewing the display device from the outside, it is intended to provide a display device using a semiconductor light-emitting element that can solve the problem that the hue changes depending on the viewing direction.

[0016] In addition, it is intended to provide a display device using a semiconductor light-emitting element in which the parasitic capacitance generated from the difference in the electrical polarity of the light-emitting element can be reduced.

[0017] In addition, it is intended to provide a display device using a semiconductor light-emitting element in which the electric field generated from the difference in the electrical polarity of the light-emitting element can be canceled out.

[0018] In addition, according to an embodiment of the present invention, when viewing the display from one side direction, it is intended to provide a display device using a semiconductor light-emitting element that visually enhances a region with a weak color sensation and corrects the difference in the color sensation of the display felt on the left / right sides.

[0019] In addition, according to an embodiment of the present invention, when viewing the display from one side direction, a region with a weak color sensation can be visually enhanced, and the difference in the color sensation of the display felt on the left / right sides can be corrected. Therefore, it is intended to provide a display device using a semiconductor light-emitting element that can obtain the effect of enhancing the color viewing angle in the final product of the display device.

[0020] On the one hand, when viewing the display device from the side, that is, in the case of the viewing angle, since the interval (pitch) between the light emission centers is constant, a display device using a semiconductor light emitting element in which no brightness difference due to the light distribution characteristics appears is to be provided.

[0021] Also, according to various embodiments, a display device using a semiconductor light emitting element that can effectively eliminate various phenomena that appear due to the tilt angle of the light emitting element or the tilted light distribution pattern, for example, the phenomenon where a dark part is visually recognized, the phenomenon where a vertical line is visually recognized, the phenomenon of light non-uniformity, etc. is to be provided.

Means for Solving the Problems

[0022] 〔One Aspect of the Present Invention〕 In the present invention, as one of its aspects, the following invention is proposed. 〔1〕 A display device using a light emitting element, comprising: A wiring board on which a plurality of unit pixels are defined; Electrode pads arranged in the unit pixels and defining a plurality of unit sub-pixels; and A light emitting element having a tilt angle with a side surface tilted to one side and having a bonding surface electrically connected on the electrode pad; Two adjacent light emitting elements are arranged symmetrically with respect to the tilt angle, A display device, characterized in that the distance between two adjacent electrode pads varies according to the position. 〔2〕 The display device according to 〔1〕, characterized in that the electrode polarities of the light emitting elements connected to the two adjacent electrode pads are arranged such that the same polarities face each other. 〔3〕 The display device according to 〔1〕, characterized in that the distance between two adjacent electrode pads varies to compensate for the shift of the light emitting surface of the light emitting element with respect to the bonding surface due to the tilt angle. 〔4〕 The display device according to [1], characterized in that the distance between two adjacent electrode pads varies along one direction in which light-emitting elements emitting light of the same hue are arranged. [5] The display device according to [1], characterized in that the polarities of the opposing light-emitting elements corresponding to the two adjacent electrode pads are the same. [6] The distance between the two adjacent electrode pads is a first distance corresponding to a tilt angle at which the light-emitting surfaces of the light-emitting elements approach each other; and a second distance corresponding to a tilt angle at which the light-emitting surfaces of the light-emitting elements move away from each other; and is characterized by comprising, the display device according to [1]. [7] The display device according to [6], characterized in that the first distance and the second distance are repeatedly positioned. [8] The display device according to [6], characterized in that the second distance is smaller than the first distance. [9] The display device according to [6], characterized in that the distance between the light-emitting surfaces of the light-emitting elements corresponding to the first distance and the second distance is the same.

[10] The display device according to [6], characterized in that the distance between the bonding surfaces of the light-emitting elements corresponding to the first distance and the second distance is different.

[11] A display device using a light-emitting element, comprising: a wiring substrate on which a plurality of unit pixels are defined; electrode pads arranged in the unit pixels and defining a plurality of unit sub-pixels; and a light-emitting element having a tilt angle with a side inclined to one side and having a bonding surface electrically connected on the electrode pad; the light-emitting element includes a first light-emitting element that emits light of a first hue along a first direction, the first light-emitting element includes a first-1 light-emitting element, a first-2 light-emitting element, and a first-3 light-emitting element that are continuously positioned, The display device is characterized in that a first distance between the first-1 light-emitting element and the first-2 light-emitting element is different from a second distance between the first-2 light-emitting element and the first-3 light-emitting element. 〔12〕 The first distance is a distance between centers of joint surfaces of the first-1 light-emitting element and the first-2 light-emitting element, The display device according to 〔11〕, wherein the second distance is a distance between centers of joint surfaces of the first-2 light-emitting element and the first-3 light-emitting element. 〔13〕 The display device according to 〔11〕, wherein a distance between two adjacent electrode pads corresponding to the first light-emitting element varies according to a position. 〔14〕 The display device according to 〔13〕, wherein the distance between the two adjacent electrode pads varies to compensate for a shift of a light-emitting surface of the light-emitting element with respect to the joint surface due to the tilt angle. 〔15〕 The display device further includes a second light-emitting element that emits light of a second color along a second direction and a third light-emitting element that emits light of a third color along a third direction, Among the first light-emitting element, the second light-emitting element, and the third light-emitting element, adjacent first light-emitting element, second light-emitting element, and third light-emitting element form one unit pixel, The display device according to 〔11〕, wherein a tilt angle direction of the second light-emitting element is different from at least one of tilt angle directions of the first light-emitting element and the third light-emitting element. 〔16〕 The display device according to 〔15〕, wherein a shift of a light-emitting surface of the light-emitting element due to the tilt angle is the same within the unit pixel. 〔17〕 The display device according to 〔11〕, wherein the first-1 light-emitting element and the first-2 light-emitting element are symmetrically positioned with respect to the tilt angle such that electrode polarities in directions facing each other are the same. 〔18〕 A display device using a light-emitting element, A wiring board on which a plurality of unit pixels are defined; An electrode pad disposed in the unit pixel and defining a plurality of unit sub-pixels; and A light-emitting element having a tilt angle with a side inclined to one side and having a bonding surface electrically connected onto the electrode pad; The display device is characterized in that The light-emitting elements adjacent along the first direction in which the first light-emitting element that emits light of the first hue is disposed are symmetrically positioned with respect to the tilt angle so that the electrode polarities of the opposing light-emitting elements are the same, The sub-pixel pitch defined by the distance between the electrode pads varies depending on the direction of the tilt angle.

[19] The sub-pixel pitch includes a first sub-pixel pitch and a second sub-pixel pitch, The display device according to

[18] , wherein the first sub-pixel pitch and the second sub-pixel pitch are alternately positioned along the first direction.

[20] The display device according to

[18] , wherein the distances between the bonding surfaces of the light-emitting elements corresponding to the first sub-pixel pitch and the second sub-pixel pitch are different from each other.

[0023] As a first aspect of the present invention for achieving the above-described object, the present invention includes (comprises; constitutes; constructs; sets; encloses; includes; contains) a wiring board on which a plurality of unit pixels are defined, an electrode pad disposed in the unit pixel and defining a plurality of unit sub-pixels, and a light-emitting element having a tilt angle with a side inclined to one side and having a bonding surface electrically connected onto the electrode pad. Two adjacent light-emitting elements are symmetrically arranged with respect to the tilt angle, and the distance between two adjacent electrode pads varies according to the position. A display device using a light-emitting element is characterized in that

[0024] In an exemplary embodiment, the electrode polarities of the light-emitting elements connected to two adjacent electrode pads are arranged such that the same polarities face each other.

[0025] In an exemplary embodiment, the distance between two adjacent electrode pads varies only by the shift of the light emitting surface of the light emitting element due to the tilt angle.

[0026] In an exemplary embodiment, the distance between two adjacent electrode pads varies by compensating for the shift of the light emitting surface of the light emitting element due to the tilt angle.

[0027] In an exemplary embodiment, the distance between two adjacent electrode pads varies along a direction in which light emitting elements that emit light of the same hue are arranged.

[0028] In an exemplary embodiment, the distance between two adjacent electrode pads includes a first distance and a second distance that are different from each other.

[0029] In an exemplary embodiment, the first distance and the second distance are repeatedly positioned.

[0030] In an exemplary embodiment, the polarities of the opposing light emitting elements corresponding to two adjacent electrode pads are the same.

[0031] In an exemplary embodiment, the distance between two adjacent electrode pads includes a first distance corresponding to a tilt angle at which the light emitting surfaces of the light emitting elements approach each other; and a second distance corresponding to a tilt angle at which the light emitting surfaces of the light emitting elements move away from each other.

[0032] In an exemplary embodiment, the second distance is smaller than the first distance.

[0033] In an exemplary embodiment, the light emitting surface is the upper surface of the light emitting element.

[0034] In an exemplary embodiment, the distance between the light emitting surfaces of the light emitting elements corresponding to the first distance and the second distance is the same.

[0035] In an exemplary embodiment, the distance between the bonding surfaces of the light emitting elements corresponding to the first distance and the second distance is different.

[0036] In an exemplary embodiment, the tilt angle of the light-emitting element is based on the crystallinity of the semiconductor material of the light-emitting element.

[0037] In an exemplary embodiment, the light-emitting element has a parallelogram in a side cross-section or side surface in the long-axis direction.

[0038] As a second aspect of the present invention for achieving the above-described object, the present invention includes a wiring substrate in which a plurality of unit pixels are defined; an electrode pad disposed in the unit pixel and defining a plurality of unit sub-pixels; and a light-emitting element having a tilt angle with a side inclined to one side and having a bonding surface electrically connected on the electrode pad, the light-emitting element includes a first light-emitting element that emits light of a first color phase along a first direction, the first light-emitting element includes a first-1 light-emitting element, a first-2 light-emitting element, and a first-3 light-emitting element that are continuously positioned, and a first distance between the first-1 light-emitting element and the first-2 light-emitting element is different from a second distance between the first-2 light-emitting element and the first-3 light-emitting element.

[0039] In an exemplary embodiment, the first distance is a distance between centers of bonding surfaces of the first-1 light-emitting element and the first-2 light-emitting element, and the second distance is a distance between centers of bonding surfaces of the first-2 light-emitting element and the first-3 light-emitting element.

[0040] In an exemplary embodiment, the light-emitting element further includes a second light-emitting element that emits light of a second color phase along a second direction and a third light-emitting element that emits light of a third color phase along a third direction, and among the first light-emitting element, the second light-emitting element, and the third light-emitting element, adjacent first light-emitting element, second light-emitting element, and third light-emitting element form one unit pixel, and a tilt angle direction of the second light-emitting element is different from at least one of tilt angles of the first light-emitting element and the third light-emitting element.

[0041] In an exemplary embodiment, within the unit pixel, a shift of a light-emitting surface of the light-emitting element due to the tilt angle is the same.

[0042] In an exemplary embodiment, the first-1 light-emitting element and the first-2 light-emitting element are symmetrically positioned with respect to the tilt angle such that electrode polarities in opposite directions are the same.

[0043] As a third aspect of the present invention for achieving the above-described object, the present invention includes a wiring substrate on which a plurality of unit pixels are defined; an electrode pad disposed in the unit pixel and defining a plurality of unit sub-pixels; and a light-emitting element having a tilt angle with a side surface inclined to one side and having a bonding surface electrically connected on the electrode pad. Adjacent light-emitting elements along a first direction in which a first light-emitting element that emits light of a first hue is disposed are symmetrically positioned with respect to the tilt angle such that the electrode polarities of the opposing light-emitting elements are the same, and a sub-pixel pitch defined by a distance between the electrode pads varies depending on the direction of the tilt angle.

[0044] In an exemplary embodiment, the sub-pixel pitch includes a first sub-pixel pitch and a second sub-pixel pitch.

[0045] In an exemplary embodiment, the first sub-pixel pitch and the second sub-pixel pitch are alternately positioned along the first direction.

[0046] In an exemplary embodiment, the sub-pixel pitch includes a first sub-pixel pitch corresponding to a tilt angle at which the light-emitting surfaces of the light-emitting elements approach each other; and a second sub-pixel pitch corresponding to a tilt angle at which the light-emitting surfaces of the light-emitting elements move away from each other.

[0047] In an exemplary embodiment, the second sub-pixel pitch is smaller than the first sub-pixel pitch.

[0048] In an exemplary embodiment, the distances between the bonding surfaces of the light-emitting elements corresponding to the first sub-pixel pitch and the second sub-pixel pitch are different from each other.

Advantages of the Invention

[0049] According to an embodiment of the present invention, there are the following advantages.

[0050] First, according to an embodiment of the present invention, the tilted light distributions of the light-emitting elements based on the crystallinity of the light-emitting elements can cancel each other out. That is, the asymmetric light distribution of the light-emitting elements can be canceled out.

[0051] As a result, when viewing the display device from the outside, the problem that the hue changes depending on the viewing direction can be solved.

[0052] Also, according to an embodiment of the present invention, the parasitic capacitance generated from the difference in the electrical polarities of the light-emitting elements can be reduced.

[0053] Also, the ghost phenomenon generated by such parasitic capacitance can be improved.

[0054] Also, according to an embodiment of the present invention, the electric field generated from the difference in the electrical polarities of the light-emitting elements can be canceled out.

[0055] Also, according to an embodiment of the present invention, when viewing the display from one side direction, the region with a weak color sense can be visually enhanced, and the difference in the color sense of the display felt on the left / right sides can be corrected. Therefore, the effect of enhancing the color viewing angle in the final product of the display device can be obtained.

[0056] On the other hand, when viewing the display device from the side direction, that is, in the case of the viewing angle, since the interval (pitch) between the light-emitting centers is constant, the difference in brightness due to the light distribution characteristics can be made not to appear.

[0057] Also, according to various embodiments, various phenomena that appear due to the tilt angle of the light-emitting elements or the tilted light distribution pattern, for example, the phenomenon where a dark part is visually recognized, the phenomenon where a vertical line is visually recognized, the phenomenon of light non-uniformity, etc. can be effectively removed.

[0058] Furthermore, according to other embodiments of the present invention, there are additional technical effects not mentioned here. Those skilled in the art can understand through the overall gist of the specification and the drawings.

Brief Description of the Drawings

[0059]

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Mode for Carrying Out the Invention

[0060] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. However, the same or similar components will be given the same reference numerals regardless of the reference signs, and duplicate explanations thereof will be omitted. The suffixes “module” and “part” for the components used in the following description are given or mixed only for the ease of preparing the specification, and do not have meanings or roles that are distinguished from each other by themselves. Further, when explaining the embodiments disclosed in this specification, if it is determined that a specific explanation of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed explanation thereof will be omitted. Also, note that the attached drawings are only for easily understanding the embodiments disclosed in this specification, and should not be construed as limiting the technical idea disclosed in this specification by the attached drawings.

[0061] Furthermore, for the convenience of explanation, each drawing is being described, but it also belongs to the scope of the present invention for those skilled in the art to embody other embodiments by combining at least two or more drawings.

[0062] Also, when an element such as a layer, region, or substrate is referred to as being “on” another component, it can be understood that this may be directly on the other element or a central element may be present therebetween.

[0063] The display device described in this specification is a concept that includes all display devices that display information by unit pixels or a set of unit pixels. Therefore, it can be applied not only to finished products but also to components. For example, a panel corresponding to a component of a digital TV also independently corresponds to the display device in this specification. As finished products, there are mobile phones, smart phones, laptop computers, digital broadcast terminals, PDAs (personal digital assistants), PMPs (portable multimedia players), navigation devices, Slate PCs, Tablet PCs, Ultra Books, digital TVs, desktop computers, and the like.

[0064] However, those skilled in the art in this technical field will easily understand that the configuration according to the embodiments described in this specification can be applied to any device capable of displaying, even in the form of new products to be developed in the future.

[0065] In addition, the semiconductor light-emitting elements mentioned in this specification are a concept that includes LEDs, mini LEDs, micro LEDs, etc., and they can be used interchangeably.

[0066] FIG. 1 is a schematic diagram of a display device using a semiconductor light-emitting element according to an embodiment of the present invention.

[0067] Referring to FIG. 1, the display device 10 is configured such that individual unit pixel regions 101 are defined on a wiring substrate 100, and a plurality of light-emitting elements 200:210, 220, 230 are provided within the unit pixel region 101.

[0068] Here, the individual light-emitting elements 210, 220, and 230 provided in the unit pixel region 101 substantially correspond to subpixels. As an example, three subpixels gather to form one pixel. In FIG. 1, each of the three light-emitting elements 210, 220, and 230 corresponds to a red, green, and blue light-emitting element.

[0069] Each of the light-emitting elements 210, 220, and 230 is electrically connected to a pair of electrode pads 130, 140 / 131, 141 / 132, 142. In this case, as an example, the electrode pads 130, 131, 132 (hereinafter, the first electrode pads) arranged in one side direction in FIG. 1 are connected to the first wiring electrodes 121, 122, 123 (signal electrodes or data electrodes).

[0070] Also, the electrode pads 140, 141, 142 (hereinafter, the second electrode pads) arranged in the other side direction are connected to the second wiring electrode 124 (common electrode or scan electrode). However, it goes without saying that the opposite case is also possible. In FIG. 1, the signal electrodes 121, 122, 123 and the common electrode 124 are omitted due to the arrangement of the electrodes and pads.

[0071] On the other hand, in some cases, the first electrode pads 130, 131, 132 correspond to the signal electrodes 121, 122, 123, and the second electrode pads 140, 141, 142 correspond to the common electrode 124.

[0072] Hereinafter, the reference numerals of the electrode pads and the wiring electrodes will be described interchangeably. That is, the electrode pads and the wiring electrodes can be described by the same reference numeral.

[0073] In this way, a unit subpixel is defined at the point where the first wiring electrodes 121, 122, 123 and the second wiring electrode 124 intersect each other.

[0074] On one hand, when the first wiring electrodes 121, 122, 123 are signal electrodes (or data electrodes), these first wiring electrodes 121, 122, 123 (or the first electrode pads 130, 131, 132) are connected to the TFT layer 120 provided with thin film transistors (Thin Film Transistor (TFT)). Therefore, each of the light emitting elements 210, 220, 230 is driven by the switching drive of this TFT layer 120.

[0075] In FIG. 1, the TFT layer 120 is shown as a single layer for simplicity, but the TFT layer 120 may include a plurality of TFT regions capable of performing a switching operation. As an example, each TFT region includes a gate electrode, a source electrode, a drain electrode, an insulating layer located therebetween, via electrodes connected to the first wiring electrodes 121, 122, 123 (or the first electrode pads 130, 131, 132), and the like. A detailed description thereof will be omitted. Each such TFT region is connected to each of the light emitting elements 210, 220, 230.

[0076] A plurality of light emitting elements 200; 210, 220, 230 are electrically connected on these wiring electrodes 121, 122, 123, 124 and are provided to form individual sub-pixels.

[0077] As described above, the light emitting element 200 includes a red light emitting element 210, a green light emitting element 220, and a blue light emitting element 230, and these three light emitting elements 210, 220, 230 form individual sub-pixels and are repeatedly positioned on the wiring substrate 100. The light emitting elements 210, 220, 230 include at least one of an organic light emitting element and an inorganic light emitting element. As an example, the light emitting elements 210, 220, 230 are inorganic semiconductor light emitting diodes (Light Emmitting Diode; LED).

[0078] This semiconductor light emitting element (LED) 200 has a size in micrometers (μm). The micrometer (μm) size means that at least one side width of the light emitting element 200 has a size of several to several hundred micrometers (μm).

[0079] The TFT layer 120 is located on the substrate 110, and the insulating layer 150 covers the TFT layer 120. This insulating layer 150 covers the connection parts of the wiring electrodes 121, 122, 123, 124, the electrode pads 130, 131, 132 / 140, 141, 142 and the light-emitting elements 210, 220, 230.

[0080] As an example, the individual light-emitting elements 210, 220, 230 are separated from each other by the partition walls 160. Also, a cover layer 170 is located on the light-emitting elements 210, 220, 230 and the partition walls 160.

[0081] As described above, the light-emitting elements 210, 220, 230 form individual subpixels and are repeatedly located on the wiring substrate 100. As an example, each pixel region 101 is repeatedly located on the wiring substrate 100.

[0082] At this time, the pixel region 101 is repeatedly located along one data electrode 121, 122, 123 (first wiring electrode) line or scan electrode 124 (second wiring electrode) line in the length direction. For example, in FIG. 1, along the left-right direction, the red light-emitting element 210, the green light-emitting element 220, and the blue light-emitting element 230 are repeatedly located. As an example, on the right side of the blue light-emitting element 230, the red light-emitting element of the adjacent pixel region is located.

[0083] On the other hand, other data electrode (first wiring electrode) lines or scan electrode (second wiring electrode) lines adjacent in parallel to one data electrode (first wiring electrode) line or scan electrode (second wiring electrode) line may be located (see FIG. 8). At this time, pixel regions 102 (see FIG. 8) having the same arrangement of the light-emitting elements 210, 220, 230 as the pixel region 101 may be located on the adjacent data electrode (first wiring electrode) lines or scan electrode (second wiring electrode) lines.

[0084] In this case, light-emitting elements having the same hue are adjacent to each other in adjacent pixel regions. For example, along a data electrode (first wiring electrode) line or a scan electrode (second wiring electrode) line, red light-emitting elements 210, green light-emitting elements 220, and blue light-emitting elements 230 are repeatedly positioned. However, in a direction perpendicular to this data electrode (first wiring electrode) line or scan electrode (second wiring electrode) line, light-emitting elements having the same hue are repeatedly positioned.

[0085] At this time, according to an embodiment of the present invention, two adjacent light-emitting elements may have different arrangements from each other. As an example, referring to FIG. 1, the red light-emitting element 210 and the green light-emitting element 220 adjacent to the red light-emitting element 210 have different arrangements from each other.

[0086] As an example, in the red light-emitting element 210, a first-type electrode, for example, an N electrode, is located on the first wiring electrode 130, and in the green light-emitting element 220, a second-type electrode, for example, a P electrode, is located on the first wiring electrode 131. Such different arrangements are also made between the green light-emitting element 220 and the blue light-emitting element 230.

[0087] That is, the red light-emitting element 210 and the green light-emitting element 220 adjacent to the red light-emitting element 210 are arranged to be symmetric with respect to the electrode positions of the respective light-emitting elements 210 and 220.

[0088] On the other hand, a light-emitting element (for example, the red light-emitting element 210) located in one pixel region 101 and a light-emitting element (for example, the red light-emitting element 210) located in a pixel region 102 adjacent to the pixel region 101 are arranged to be symmetric with respect to the electrode positions in this way.

[0089] That is, on the wiring substrate 100, a first light-emitting element 210 located in the first pixel region 101 and provided in the first arrangement and a second light-emitting element 210 located in the second pixel region 102 adjacent to the first pixel region 101 and provided in the second arrangement so as to be symmetric with the first arrangement are located.

[0090] With the first and second arrangements of the light-emitting element 210 as described above, it is possible to reduce the parasitic capacitance generated from the difference in the electrical polarities between the first light-emitting element and the second light-emitting element.

[0091] Also, with the first and second arrangements of the light-emitting element 210, it is possible to cancel out the electric field generated from the difference in the electrical polarities between the first light-emitting element and the second light-emitting element.

[0092] The light-emitting element 210 having different arrangements from each other and its effects will be described in detail later.

[0093] FIG. 2 is a schematic diagram showing an example of the arrangement of sub-pixels of a display device using a semiconductor light-emitting element according to an embodiment of the present invention.

[0094] Referring to FIG. 2, it shows a state in which the light-emitting elements 230a, 230b, 230c, and 230d are provided in a symmetric arrangement with respect to each other on the wiring substrate 100. This corresponds to a state in which the light-emitting elements are arranged in a row in parallel in one direction.

[0095] As described above, the light-emitting elements 230a, 230b, 230c, and 230d have asymmetric light distributions a and b (see FIGS. 5 and 6) with respect to the direction of connecting the first-type electrode 235 and the second-type electrode 237. Also, each of the light-emitting elements 230a, 230b, 230c, and 230d has an asymmetric light distribution with respect to the direction of connecting the first electrode pad 132 and the second electrode pad 142.

[0096] For example, the first light-emitting element 230a and the third light-emitting element 230c have a light distribution a tilted to the left. This corresponds to the first arrangement. Also, the second light-emitting element 230b located between the first light-emitting element 230a and the third light-emitting element 230c and the fourth light-emitting element 230d located on the right side of the third light-emitting element 230c have a light distribution b tilted to the right. This corresponds to the second arrangement.

[0097] This is a result based on the material properties of at least one of the substrate 231 and the semiconductor layer 232. For example, such a phenomenon occurs because at least one of the crystal structures of the substrate 231 and the semiconductor layer 232 has an inclined shape.

[0098] As shown in FIG. 2, each of the light-emitting elements 230a, 230b, 230c, and 230d has an inclined crystal structure. In particular, when considering a region where two adjacent pixels form a pair (hereinafter referred to as the first region 230), the first light-emitting element 230a of one pixel and the second light-emitting element 230b of the other pixel have tilt angles so as to be symmetric with each other. As an example, the first light-emitting element 230a and the second light-emitting element 230b form an angle inclined in a direction away from each other. Also, in the second region 231 adjacent to the first region 230, the third light-emitting element 230c and the fourth light-emitting element 230d of the other pixel have tilt angles so as to be symmetric with each other.

[0099] FIG. 3 is a schematic diagram showing another example of the arrangement of sub-pixels of a display device using a semiconductor light-emitting element according to an embodiment of the present invention.

[0100] Referring to FIG. 3, it shows a state in which the light-emitting elements 230e, 230f, 230g, and 230h are provided in a symmetric arrangement with respect to each other on the wiring substrate 100. This corresponds to a state in which the arrangement of the light-emitting elements shown in FIG. 6 is continuously arranged in parallel.

[0101] As described above, the light-emitting elements 230e, 230f, 230g, and 230h have asymmetric light distributions a and b with respect to the direction connecting the first-type electrode 235 and the second-type electrode 237. Also, each of the light-emitting elements 230e, 230f, 230g, and 230h has asymmetric light distributions a and b (see FIGS. 5 and 6) with respect to the direction connecting the first electrode pad 132 and the second electrode pad 142.

[0102] As shown in FIG. 3, each of the light-emitting elements 230e, 230f, 230g, and 230h has a crystal structure that is tilted in this way. In particular, when considering the region where two adjacent pixels form a pair (hereinafter referred to as the third region 232), the fifth light-emitting element 230e of one pixel and the sixth light-emitting element 230f of the other pixel have tilt angles so as to be symmetric with each other. As an example, the fifth light-emitting element 230e and the sixth light-emitting element 230f form an angle tilted in a direction approaching each other. Also, in the fourth region 233 adjacent to the third region 232, the seventh light-emitting element 230g and the eighth light-emitting element 230h of the other pixel have tilt angles so as to be symmetric with each other.

[0103] FIG. 4 is a diagram schematically showing the arrangement of sub-pixels in FIGS. 2 and 3.

[0104] FIG. 4(a) schematically shows a state in which the pair of the first light-emitting element 230a and the second light-emitting element 230b in the first region 230 of FIG. 2 forms an angle tilted in a direction in which they move away from each other. That is, the distance between the first light-emitting element 230a and the second light-emitting element 230b gradually increases from the lower surface to the upper surface of the first light-emitting element 230a and the second light-emitting element 230b.

[0105] Also, FIG. 4(b) schematically shows a state in which the pair of the fifth light-emitting element 230e and the sixth light-emitting element 230f in the third region 232 of FIG. 10 forms an angle tilted in a direction in which they approach each other. That is, the distance between the first light-emitting element 230a and the second light-emitting element 230b gradually decreases from the lower surface to the upper surface of the first light-emitting element 230a and the second light-emitting element 230b.

[0106] As described above, when the light-emitting elements are symmetrically positioned in pairs with adjacent pixels, the tilted light distributions a and b based on the crystal structures of the light-emitting elements cancel each other out. That is, the problem that the hue changes according to the viewing direction when viewing the display device from the outside can be solved.

[0107] FIG. 5 is a schematic diagram showing the arrangement of sub-pixels of a display device using a semiconductor light-emitting element according to an embodiment of the present invention.

[0108] Referring to FIG. 5, it shows a state where the first light-emitting element 230a and the second light-emitting element 230b adjacent to each other are positioned having a first arrangement and a second arrangement which are different from each other. Also, the second light-emitting element 230b and the third light-emitting element 230c are also positioned having different arrangements from each other.

[0109] For example, the first light-emitting element 230a and the third light-emitting element 230c are positioned having the first arrangement, and the second light-emitting element 230b positioned between the first light-emitting element 230a and the third light-emitting element 230c is positioned having the second arrangement.

[0110] At this time, the first light-emitting element 230a, the second light-emitting element 230b, and the third light-emitting element 230c are all light-emitting elements that emit the same hue. As an example, the first light-emitting element 230a, the second light-emitting element 230b, and the third light-emitting element 230c are all blue light-emitting elements.

[0111] Here, the first arrangement is an arrangement in which the N electrode 235 is positioned on the left side and the P electrode 237 is positioned on the right side in FIG. 5. In each of the light-emitting elements 230a, 230b, 230c, a semiconductor layer 232 is positioned on the substrate 231, and a first-type electrode, for example, an N-type electrode 235 and a second-type electrode, for example, a P-type electrode 237, which are in contact with this semiconductor layer 232, are positioned.

[0112] That is, each of the light-emitting elements 230a, 230b, 230c includes a substrate 231, a semiconductor layer 232, a first-type electrode 235, and a second-type electrode 237. At this time, each of the light-emitting elements 230a, 230b, 230c has different arrangements from each other with respect to the direction connecting the first-type electrode 235 and the second-type electrode 237.

[0113] Referring to FIG. 5, each of the light-emitting elements 230a, 230b, and 230c has an asymmetric light distribution a, b with respect to the direction connecting the first-type electrode 235 and the second-type electrode 237. For example, the first light-emitting element 230a and the third light-emitting element 230c have a light distribution a tilted to the left. This corresponds to the first arrangement. Also, the second light-emitting element 230b located between the first light-emitting element 230a and the third light-emitting element 230c has a light distribution b tilted to the right. This corresponds to the second arrangement.

[0114] This is a result based on the material characteristics of at least one of the substrate 231 and the semiconductor layer 232. For example, such a phenomenon occurs because at least one of the crystal structures of the substrate 231 and the semiconductor layer 232 has an inclined shape. This will be described in detail later.

[0115] FIG. 6 is a schematic diagram showing the effect of the arrangement of sub-pixels of a display device using a semiconductor light-emitting element according to an embodiment of the present invention.

[0116] Referring to FIG. 6, light-emitting elements 230b, 230c that are provided on the wiring substrate 100 and form sub-pixels are provided.

[0117] At this time, referring to the lower FIG. 6(B), the wiring substrate 100 includes wiring electrodes 123, 124 including a first wiring electrode 123 and a second wiring electrode 124 arranged on the wiring substrate 100 as described above with reference to FIG. 1. In each unit pixel region, the light-emitting elements 230b, 230c are provided electrically connected to the first wiring electrode 123 and the second wiring electrode 124. That is, the arrangement of the sub-pixels in FIG. 6 corresponds to the case of the blue light-emitting element 230 in FIG. 1.

[0118] Here, referring to both FIGS. 6(A) and (B), the light-emitting elements 230b, 230c include a first light-emitting element 230b located in the first pixel region and provided in the first arrangement, and a second light-emitting element 230c located in the second pixel region adjacent to the first pixel region and provided in the second arrangement so as to be symmetric with the first arrangement.

[0119] The first light-emitting element 230b and the second light-emitting element 230c include a substrate 231, a semiconductor layer 232, a first-type electrode 235, and a second-type electrode 237. At this time, the first light-emitting element 230b and the second light-emitting element 230c have different arrangements with respect to the direction connecting the first-type electrode 235 and the second-type electrode 237.

[0120] As a result, the light distribution a tilted to one side by the first arrangement and the light distribution b tilted to the other side by the second arrangement are combined with each other to have a non-tilted light distribution c directed toward the center side. That is, the asymmetric light distributions can be offset by the first arrangement of the first light-emitting element 230b and the second arrangement of the second light-emitting element 230c.

[0121] At this time, as described above, the first light-emitting element 230b and the second light-emitting element 230c are light-emitting elements that emit the same hue and are located in adjacent pixel regions, for example, blue light-emitting elements.

[0122] When a constant voltage is applied to a light-emitting diode (LED) having a PN junction structure, charges and holes recombine in the vicinity where the P-region and the N-region are in contact with each other to emit light. At this time, the portion where the maximum light is emitted is not in the middle of the region where the P-region and the N-region are in contact with each other, but is tilted to other regions. Therefore, when a display is manufactured using this LED, the color perception may appear to change depending on the viewing direction of the display.

[0123] However, as described above, by symmetrically configuring the first arrangement of the first light-emitting element 230b and the second arrangement of the second light-emitting element 230c, when viewing the display from one side direction, the region with weak color perception can be visually enhanced, and the difference in color perception of the display felt on the left / right sides can be corrected. Therefore, an effect of enhancing the color viewing angle can be obtained in the final product of the display device.

[0124] In addition, due to the symmetrical arrangement of the first light-emitting element 230b and the second light-emitting element 230c, the electric field formed by the difference in the polarities of the light-emitting elements 230b and 230c can be removed, and the generation of parasitic capacitance can be prevented. Further, the ghost phenomenon generated by this parasitic capacitance can be improved.

[0125] FIG. 7 is a schematic diagram showing a process of forming the arrangement of sub-pixels according to FIG. 2.

[0126] Thus, an example of a method of transferring the light-emitting elements so that they have different arrangements from each other will be briefly described with reference to FIG. 7.

[0127] For example, the light-emitting elements 230a and 230c are first transferred to the electrode pads #1, #3, etc. in the odd-numbered columns of the wiring substrate, and then, after rotating the positions of the light-emitting elements by 180 degrees, the light-emitting elements 230b and 230d are transferred to the electrode pads #2, #4, etc. in the even-numbered columns of the wiring substrate.

[0128] The light-emitting elements 230a to 230d are transferred to the transfer substrate 410 in a state of being located on the wafer 500, and then transferred to the wiring substrate. Here, the transfer substrate 410 is, as an example, a blue tape.

[0129] First, the light-emitting elements 230a and 230c are transferred to the transfer substrate 410 in a state of being arranged like the upper circle 1 (a state where the reference point M of the wafer 500 is located on the left side).

[0130] Next, the light-emitting elements 230a and 230c transferred to the transfer substrate 410 are transferred to the electrode pads #1, #3, etc. in the odd-numbered columns of the wiring substrate.

[0131] Thereafter, the light-emitting elements 230b and 230d are transferred to the transfer substrate 410 in a state where the wafer 500 is rotated 180 degrees like the lower circle 2 (a state where the reference point M of the wafer 500 is located on the right side).

[0132] Next, the light-emitting elements 230b and 230d transferred to the transfer substrate 410 are transferred to the electrode pads #2, #4, etc. on the even-numbered columns of the wiring substrate.

[0133] Through this process, the light-emitting elements 230a to 230h having the arrangement as shown in FIGS. 2 to 4 are transferred onto the wiring substrate.

[0134] FIG. 8 is a side photograph showing individual light-emitting elements of a display device using a semiconductor light-emitting element according to an embodiment of the present invention. Further, FIG. 9 is a schematic diagram showing the tilt angle of individual light-emitting elements of a display device using a semiconductor light-emitting element according to an embodiment of the present invention.

[0135] FIG. 8 is an enlarged photograph showing the side of the blue light-emitting element 230. FIG. 8 shows the sapphire substrate that forms most of the thickness of this blue light-emitting element 230. As shown in FIG. 9, the tilt angle α of the blue light-emitting element 230 is approximately 10 degrees. Also, as an example, the thickness t of the blue light-emitting element 230 is 80 μm.

[0136] However, the gallium nitride semiconductor layer located on the sapphire substrate also has the same or a similar tilt angle. In some cases, the sapphire substrate may be removed after the light-emitting element is fabricated. At this time, the light-emitting element has a tilt angle as described above, not with the substrate but with the gallium nitride-based semiconductor layer.

[0137] In this way, the cross-sections or sides of the light-emitting elements 210, 220, and 230 are formed in a parallelogram shape.

[0138] Due to this tilt angle α, there are offsets F and F' between the light-emitting surface E of the blue light-emitting element 230 and the surface opposite to the light-emitting surface (hereinafter referred to as the bonding surface) 234 of the light-emitting element 230. Such offsets F and F' can be considered as the offset amount between the bonding surface 234 and the light-emitting surface E in the ideal case where the cross-section or side of the light-emitting element 230 is formed in a rectangular shape. Hereinafter, for convenience, such offsets F and F' are also referred to as a shift.

[0139] As a result, a difference in length / area corresponding to the shifts F and F' occurs between the bonding surface 234 of the light-emitting element 230 and the light-emitting surface E. As an example, the position of the light-emitting element 230 viewed from the light-emitting surface E side is different from the position of the light-emitting element 230 viewed from the bonding surface 234 side.

[0140] For example, in the general case, when the electrode pads 132 and 142 are arranged at a predetermined interval (pitch) with respect to the bonding surface 234 of the light-emitting element 230 to form sub-pixels, the interval between the light-emitting surfaces E becomes larger or smaller by the shifts F and F'.

[0141] Therefore, when manufacturing a display device using the light-emitting elements 210, 220, and 230, if the intervals between the electrode pads 130, 140 / 131, 141 / 132, 142 to which the light-emitting elements 210, 220, 230 are connected are set to the sub-pixel pitch in accordance with the bonding surface 234 of the light-emitting elements 210, 220, 230, the sub-pixel pitch varies by the shifts F and F' on the light-emitting surface E side.

[0142] Here, the tilt angle α of the blue light-emitting element 230 is the same on both sides in the length direction of the light-emitting element 230. In this case, the shifts F and F' on both sides in the length direction of the blue light-emitting element 230 are the same as each other (F = F').

[0143] This is similarly applicable to the case of the red light-emitting element 210 or the green light-emitting element 220, not the blue light-emitting element 230.

[0144] When considering this case, when manufacturing a display device using the light-emitting elements 210, 220, 230, if the intervals between the electrode pads 130, 140 / 131, 141 / 132, 142 to which the light-emitting elements 210, 220, 230 are connected are set to the sub-pixel pitch in accordance with the light-emitting surface E of the light-emitting elements 210, 220, 230, a uniform sub-pixel pitch can be ensured regardless of the shifts F and F' on the light-emitting surface E side. In this case, the intervals of the electrode pads 130, 140 / 131, 141 / 132, 142 vary to compensate for the shifts F and F'.

[0145] This will be described in detail later.

[0146] Figure 10 schematically shows the sapphire crystal plane and crystal direction. Sapphire is used as a growth substrate for a light-emitting element made of a gallium nitride-based semiconductor.

[0147] As shown in the figure, sapphire has an inclined crystal plane. As an example, the R-plane has a crystal plane inclined with respect to the m-axis. Usually, sapphire has the R-plane as the growth plane. Referring to Figure 10, since the R-plane has a plane inclined with respect to the crystal shape of the hexagonal prism, the sapphire substrate and the gallium nitride-based semiconductor grown on the crystal plane of the sapphire substrate have such an inclined tilt angle.

[0148] Also, such a tilt angle is formed based on being cut in the crystal plane direction of the sapphire substrate after a light-emitting element is formed of a gallium nitride-based semiconductor on the sapphire substrate.

[0149] Figure 11 is a side photograph showing a light-emitting element of a display device using a semiconductor light-emitting element according to an embodiment of the present invention. Figure 12 is a schematic diagram showing the tilt angle of the light-emitting element of a display device using a semiconductor light-emitting element according to an embodiment of the present invention. Figure 13 is a side photograph showing a light-emitting element of a display device using a semiconductor light-emitting element according to another embodiment of the present invention.

[0150] Referring to Figures 11 and 12, the light-emitting elements used in the display have various tilt angles. As an example, the light-emitting elements shown in Figures 11(A) and 12(A) have a tilt angle of 5 degrees or less in one side direction.

[0151] Also, the light-emitting elements shown in Figures 11(B) and 12(B) have a tilt angle of 12 degrees or less in the direction opposite to the tilt angle of the light-emitting elements shown in Figures 11(A) and 12(A).

[0152] In addition, the light-emitting elements shown in FIGS. 11(C) and 12(C) have a tilt angle of 10 degrees or less in the same direction as the tilt angle of the light-emitting elements shown in FIGS. 11(B) and 12(B).

[0153] In this way, the light-emitting element has a parallelogram structure with a side cross-section inclined to one side, and as described above, has a light-emitting pattern in which the light-emitting direction is non-uniform with respect to the direction perpendicular to the surface and is inclined to one side.

[0154] The directions forming the tilt angle of this light-emitting element are different from each other depending on the light-emitting element. It can be seen from FIG. 11(A) that the tilt angle direction of the red light-emitting element 210 is different from that of the blue light-emitting element 230 described above.

[0155] Referring to FIG. 11(A), when the first-type electrode is the anode and the second-type electrode is the cathode, the red light-emitting element 210 has a state of being inclined in the cathode direction with respect to the light-emitting surface (upper surface). Referring to FIG. 11(B), the green light-emitting element 220 has a state of being inclined in the anode direction with respect to the light-emitting surface (upper surface). Also, referring to FIG. 11(C), the blue light-emitting element 230 has a state of being inclined in the anode direction with respect to the light-emitting surface (upper surface), similar to the green light-emitting element 220.

[0156] On the other hand, referring to FIG. 13(A), when the first-type electrode is the anode and the second-type electrode is the cathode, the red light-emitting element 210 has a state of being inclined in the anode direction with respect to the light-emitting surface (upper surface). Referring to FIG. 13(B), the green light-emitting element 220 has a state of being inclined in the cathode direction with respect to the light-emitting surface (upper surface). Also, referring to FIG. 13(C), the blue light-emitting element 230 has a state of being inclined in the cathode direction with respect to the light-emitting surface (upper surface), similar to the green light-emitting element 220.

[0157] Thus, the tilt angles of the light-emitting elements 210, 220, and 230 have various arrangements according to the manufacturing conditions and states. The tilt angles of the light-emitting elements 210, 220, and 230 and the arrangements of the positive electrode (+) and the negative electrode (-) shown in FIGS. 11 to 13 are exemplary, and it goes without saying that there may be other arrangements not shown in FIGS. 11 to 13. According to an embodiment of the present invention, the light-emitting elements 210, 220, and 230 having such various tilt angles and the arrangements of the positive electrode (+) and the negative electrode (-) are used.

[0158] FIG. 14 is a schematic diagram showing an example of a sub-pixel arrangement of a display device using a semiconductor light-emitting element having a tilt angle.

[0159] Referring to FIG. 14, the wiring substrate 100 is omitted, and an example of the arrangements of the electrode pads 130, 140 / 131, 141 / 132, 142 and the arrangements of the light-emitting elements 210, 220, 230 connected to the electrode pads 130, 140 / 131, 141 / 132, 142 is schematically shown.

[0160] Here, the red light-emitting elements 210 are arranged in one direction, and the green light-emitting elements 220 are arranged in one direction adjacent to the arrangement of the red light-emitting elements 210. Further, the blue light-emitting elements 230 are arranged in one direction adjacent to the arrangement of the green light-emitting elements 220. At this time, each adjacent light-emitting element 210, 220, 230 forms a sub-pixel. As an example, a set of adjacent red light-emitting element 210, green light-emitting element 220, and blue light-emitting element 230 forms one pixel.

[0161] FIG. 14 shows a state in which the aforementioned electrode pads 130, 140 / 131, 141 / 132, 142 are arranged at a predetermined interval A. That is, it shows a state in which the intervals of the electrode pads 130, 140 / 131, 141 / 132, 142 to which the light-emitting elements 210, 220, 230 are connected are set to the sub-pixel pitch in accordance with the bonding surface 234 of the light-emitting elements 210, 220, 230.

[0162] In this way, with the electrode pads 130, 140 / 131, 141 / 132, 142 arranged at a predetermined interval A, the sub-pixel pitch varies on the light-emitting surface E side of the light-emitting elements 210, 220, 230 according to the characteristics of the light-emitting elements having a tilt angle.

[0163] Referring to FIG. 14, it can be seen that the electrode pads 130, 140 / 131, 141 / 132, 142 form a predetermined interval A, but the intervals a, b, c between the light-emitting elements 210, 220, 230 change. Here, it can be seen that b, which is the interval between the light-emitting surfaces of the second and third light-emitting elements, is larger than a, which is the interval between the light-emitting surfaces of the first and second light-emitting elements. Also, c, which is the interval between the light-emitting surfaces of the third and fourth light-emitting elements, is smaller than b. Substantially, a and c may be the same.

[0164] As described above, due to the tilt angle α of the light-emitting elements 210, 220, 230, a difference in length / area of the shift F, F' occurs between the bonding surface 234 and the light-emitting surface E of the light-emitting elements 210, 220, 230. As a result, the interval between the light-emitting surfaces E becomes larger or smaller by the shift F, F'.

[0165] FIG. 15 is a schematic diagram showing the arrangement of sub-pixels of a display device using a semiconductor light-emitting element having a tilt angle according to the first embodiment of the present invention.

[0166] As described above, when manufacturing a display device using the light-emitting elements 210, 220, 230, when setting the interval between the electrode pads 130, 140 / 131, 141 / 132, 142 to which the light-emitting elements 210, 220, 230 are connected to the sub-pixel pitch in accordance with the light-emitting surface E of the light-emitting elements 210, 220, 230, a uniform sub-pixel pitch can be ensured regardless of the shift F, F' on the light-emitting surface E side. In this case, the interval between the electrode pads 130, 140 / 131, 141 / 132, 142 varies to compensate for the shift F, F'.

[0167] Referring to FIG. 15, the distances a between the light-emitting surfaces of the first and second light-emitting elements, b between the light-emitting surfaces of the second and third light-emitting elements, and c between the light-emitting surfaces of the third and fourth light-emitting elements are all the same, and the distances between the electrode pads 130, 140 / 131, 141 / 132, 142 vary according to the position. That is, the distances between the electrode pads 130, 140 / 131, 141 / 132, 142 change according to the position.

[0168] On the other hand, comparing the first distance between the bonding surfaces of the first and second light-emitting elements located continuously and the second distance between the bonding surfaces of the second and third light-emitting elements, the first distance and the second distance are different from each other. This corresponds to the distances between the corresponding electrode pads.

[0169] In this way, the distances between adjacent light-emitting elements are the same based on the light-emitting surfaces of the light-emitting elements, but the distances between adjacent light-emitting elements change based on the bonding surfaces of the light-emitting elements.

[0170] As described above with reference to FIGS. 2 and 3, the light-emitting elements 210, 220, 230 are shown in a state where they are arranged symmetrically with respect to each other in one direction. This corresponds to a state where the light-emitting elements are arranged in series in one direction.

[0171] In this way, a state in which each of the light-emitting elements 210, 220, 230 has a tilted crystal structure is schematically shown. In particular, when comparing any two adjacent pixels, the two light-emitting elements (as an example, the first and second light-emitting elements) belonging to the two pixels have tilt angles so as to be symmetric with each other. As an example, the first and second light-emitting elements form an angle tilted in a direction in which they approach each other as the light-emitting surface moves away from the pad. Also, the second and third light-emitting elements have an angle tilted in a direction in which they move away from each other as the light-emitting surface moves away from the pad.

[0172] Referring to FIG. 15, from the perspective of the arrangement of light-emitting elements that emit light of the same hue, the intervals a, b, and c between the light-emitting surfaces are arranged to be the same (a = b = c). At this time, the intervals A, B, and C between the electrode pads 130, 140 / 131, 141 / 132, 142 are different from each other.

[0173] The pad interval A between two light-emitting elements corresponding to an angle at which the light-emitting surfaces are inclined in a direction approaching each other as they are farther from the pads is larger than the pad interval B between two light-emitting elements corresponding to an angle at which the light-emitting surfaces are inclined in a direction away from each other as they are farther from the pads. Such pad intervals A and B are repeatedly arranged. That is, referring to FIG. 15, the interval A between the pads corresponding to the first and second light-emitting elements is the same as the interval C between the pads corresponding to the third and fourth light-emitting elements.

[0174] As described above, a display device according to an embodiment of the present invention includes a wiring board 100 (see FIG. 2) in which a plurality of unit pixels are defined, electrode pads 130, 140 / 131, 141 / 132, 142 that are disposed in the unit pixels and define a plurality of unit sub-pixels, and light-emitting elements 210, 220, 230 that have a tilt angle with a side inclined to one side and are electrically connected on the electrode pads 130, 140 / 131, 141 / 132, 142. According to an exemplary embodiment, two adjacent light-emitting elements are arranged symmetrically with respect to the tilt angle, and the distances A, B, and C between two adjacent electrode pads are variable.

[0175] Such an arrangement of the light-emitting elements and the electrode pads corresponds to an arrangement of first light-emitting elements that emit light of a first hue along a first direction. As an example, it corresponds to a red light-emitting element that emits red light. Also, such an arrangement of the light-emitting elements and the electrode pads corresponds to an arrangement of second light-emitting elements that emit light of a second hue along a second direction. As an example, it corresponds to a green light-emitting element that emits green light. Also, such an arrangement of the light-emitting elements and the electrode pads corresponds to an arrangement of third light-emitting elements that emit light of a third hue along a third direction. As an example, it corresponds to a blue light-emitting element that emits blue light.

[0176] Here, the first direction means the direction in which light-emitting elements that emit light of the same hue are arranged. The second direction is substantially the same (parallel) as the first direction, but is separated from the first direction by a sub-pixel pitch. Similarly, the third direction is substantially the same (parallel) as the second direction, but is separated from the second direction by a sub-pixel pitch.

[0177] On the other hand, pixel units are formed in a direction crossing the first direction, the second direction, and the third direction. As an example, referring to FIG. 15, the three light-emitting elements 210, 220, and 230 on the left form one pixel.

[0178] Thus, with respect to the arrangement of the light-emitting elements 210, 220, and 230 that emit light of the same hue, two adjacent light-emitting elements are symmetrically positioned with respect to the tilt angle such that the electrode polarities of the opposing light-emitting elements are the same, and the distance between two adjacent electrode pads 130, 140 / 131, 141 / 132, 142 varies along the arrangement direction of the light-emitting elements that emit light of the hue.

[0179] In an exemplary embodiment, the electrode polarities of the light-emitting elements 210, 220, and 230 connected to two adjacent electrode pads are arranged such that the same polarities face each other. As an example, when a first-type electrode (e.g., an n-type electrode) and a second-type electrode (e.g., a p-type electrode) are positioned at positions fixed with respect to the tilt angle of the light-emitting elements 210, 220, and 230, two adjacent light-emitting elements have an arrangement such that the tilt angles are symmetric, so the polarities at the opposing positions of the two adjacent light-emitting elements are the same.

[0180] FIGS. 16 to 18 are schematic views showing an example of the arrangement of light-emitting elements having a tilt angle. FIGS. 16 to 18 exemplarily illustrate a red light-emitting element 210 having a light-emitting surface E and a bonding surface 212, but the same also applies to green and blue light-emitting elements.

[0181] In the case of FIG. 16, an example is shown in which the light-emitting elements 210 having a tilt angle are arranged in the same direction and at a predetermined interval a' with respect to the tilt angle / electrode position. In this case, the distance between the centers of the bonding surfaces 212 is A, and they are all the same. Therefore, the distance between the centers of the electrode pads 130 and 140 is also the same. In this case, the distance between the light-emitting surfaces E of two adjacent light-emitting elements 210 is the same at a'.

[0182] In the case of FIG. 17, it corresponds to the case described above with reference to FIG. 14. That is, an example is shown in which the light-emitting elements 210 having a tilt angle are arranged in a symmetric direction and at a predetermined interval a' with respect to the tilt angle / electrode position. In this case, the distance between the centers of the bonding surfaces 212 is A, and they are all the same. Therefore, the distance between the centers of the electrode pads 130 and 140 is also the same. In this case, the distance between the light-emitting surfaces E varies (a, b, c, b > a, c, a = c).

[0183] In the case of FIG. 18, it corresponds to the case described above with reference to FIG. 15. That is, an example is shown in which the light-emitting elements 210 having a tilt angle are arranged in a symmetric direction and at other intervals a, b, c. In this case, the distance between the centers of the bonding surfaces 212 varies to A, B, C. Therefore, the distance between the centers of the electrode pads 130 and 140 also varies similarly.

[0184] As described above, the distance between the centers of the bonding surfaces 212 of the light-emitting elements 210 varies so that the distances a, b, c between the light-emitting surfaces E are the same (a = b = c).

[0185] Therefore, the distance between the centers of the electrode pads 130 and 140 also varies so that the distances a, b, c between the light-emitting surfaces E are the same (a = b = c, A > B, C > B, A = C).

[0186] At this time, the distance between the centers of the electrode pads 130 and 140 or the distance between the centers of the bonding surfaces 212 of the light-emitting elements 210 varies so as to compensate for the shift F due to the tilt angle. That is, the distances A, B, C between two adjacent electrode pads vary by the shift F due to the tilt angle.

[0187] As an example, the distances A, B, and C between two adjacent electrode pads (the centers of the bonding surfaces of the light-emitting elements) include a first distance A and a second distance B that are different from each other. As an example, the first distance A and the second distance B are repeatedly positioned (A = C).

[0188] In an exemplary embodiment, the distance between two adjacent electrode pads (the centers of the bonding surfaces of the light-emitting elements) includes a first distance A corresponding to a tilt angle at which the light-emitting surfaces E of the light-emitting elements 210 approach each other and a second distance B corresponding to a tilt angle at which the light-emitting surfaces E of the light-emitting elements 210 move away from each other. In this case, the second distance B is smaller than the first distance A (A > B).

[0189] From another perspective, the light-emitting elements adjacent along the first direction in which the first light-emitting element that emits light of the first hue is arranged are symmetrically positioned with respect to the tilt angle such that the electrode polarities of the opposing light-emitting elements are the same, and the sub-pixel pitch defined by the distance between the electrode pads varies depending on the direction of the tilt angle.

[0190] In other words, as an example, when the red light-emitting elements 210 that emit red light are arranged adjacent to each other in one direction, the adjacent light-emitting elements 210 are symmetrically positioned with respect to the tilt angle such that the electrode polarities of the light-emitting elements 210 are the same, and the sub-pixel pitches A, B, and C defined by the distance between the electrode pads (or the distance between the centers of the bonding surfaces of the light-emitting elements 210) vary depending on the direction of the tilt angle.

[0191] In an exemplary embodiment, the sub-pixel pitches A, B, and C include a first sub-pixel pitch A and a second sub-pixel pitch B. As an example, the first sub-pixel pitch A and the second sub-pixel pitch B are alternately positioned along one direction (A = C).

[0192] That is, the sub-pixel pitches A, B, and C include a first sub-pixel pitch A corresponding to the tilt angle at which the light-emitting surfaces E of the light-emitting elements 210 approach each other and a second sub-pixel pitch B corresponding to the tilt angle at which the light-emitting surfaces E of the light-emitting elements 210 move away from each other. In this case, the second sub-pixel pitch B is smaller than the first sub-pixel pitch A (A > B).

[0193] FIG. 19 is a conceptual diagram showing a light emission pattern by a light-emitting element having a tilt angle.

[0194] Referring to FIG. 19, it schematically shows the light emission pattern of the light-emitting element 210 having a tilt angle, specifically, the light-emitting element 210 having a tilted (tilt) angle instead of a 90-degree angle on the side surface.

[0195] Hereinafter, an example of the red light-emitting element 210 will be described, but this description is similarly applicable to the green light-emitting element 220 and the blue light-emitting element 230.

[0196] The light-emitting layer of the light-emitting element 210 is located close to the bonding surface 212. Most of the thickness above this light-emitting layer 212 is occupied by the substrate. The light generated from this light-emitting layer is emitted toward the light-emitting surface E. At this time, there is light that directly reaches the light-emitting surface E and is emitted through this light-emitting surface E, but theoretically, since light is emitted in all directions in the light-emitting layer, there is light emitted toward the first side surface 213 and the second side surface 214.

[0197] Thus, among the light emitted toward the first side surface 213 and the second side surface 214, due to the tilted angle, a part of the light emitted toward the first side surface 213 does not pass through this first side surface 213 due to a small incident angle and is totally reflected inside the light-emitting element 210.

[0198] On the other hand, even if the light emitted toward the second side surface 214 is totally reflected from this second side surface 214, due to the inclined angle, it is reflected in the diagonal direction (the direction toward the first side surface 213) and emitted through the light emitting surface E. Therefore, in the structure of the light emitting element 210 in which the light emitting surface E is inclined with respect to the second side surface 214, the light emitting pattern is formed in an elliptical shape inclined with respect to the first side surface 213 which is the opposite surface thereof. This is one of the reasons for showing an asymmetric light emitting pattern in the light emitting element 210 having an inclined (tilted) angle.

[0199] FIG. 20 schematically shows the light distribution of the display device according to the arrangement of FIG. 14. FIG. 21 shows a microscopic analysis showing the actual light emission of the display device according to the arrangement of FIG. 14.

[0200] FIG. 22 shows the light distribution seen from the front of the display device according to the arrangement of FIG. 14 and a schematic diagram thereof. FIG. 23 shows the light distribution seen from the side of the display device according to the arrangement of FIG. 14 and a schematic diagram thereof.

[0201] Referring to FIG. 20, it shows that the asymmetric light distributions of the light emitting elements 210 having the tilt angles described above are canceled out by the symmetric arrangement with respect to the tilt angles of the light emitting elements 210. This is consistent with what was described above with reference to FIG. 6.

[0202] However, when the light emitting surface E is used as a reference, it can be seen that the position of the light emitting surface E causes a distance difference of D1 and D2 between the light emitting elements due to the shift caused by the tilt angle as described above.

[0203] As an example, the distance between the light emitting surfaces E between the first and second light emitting elements is D1, but the distance between the light emitting surfaces E between the second and third light emitting elements is D2, and it can be seen that it becomes even larger. Such a distance (sub-pixel pitch) is repeated as D1 / D2.

[0204] Figure 21 is an image captured using a microscope to show the light emission from two adjacent light-emitting elements while displaying a green pattern on a display device using the microscope. The circle represents the outer shape of the actually emitted green pattern.

[0205] Referring to Figure 21, it shows an image formed by the light emission of two adjacent light-emitting elements for four pixel pitches (P1 to P4). Here, since light-emitting elements emitting the same hue (as an example, green light-emitting elements) are shown, this pixel pitch is also regarded as a sub-pixel pitch. That is, P2 to P4 in Figure 21 show the actually emitting state by an array of light-emitting elements having different (sub) pixel pitches from each other in the state described above with reference to Figure 14.

[0206] Here, P1 and P2 have the same (sub) pixel pitch, but in the case of P1, it shows a state where the light-emitting elements are arranged in the same direction with respect to the tilt angle. Therefore, although there is non-uniformity in the light-emitting pattern, the interval of the light-emitting surfaces corresponds to the same state.

[0207] Going from P2 to P4, the (sub) pixel pitch becomes even larger. Here, in the case of P2, it can be seen that a dark portion H is visible between the light-emitting elements. In particular, when the light-emitting surfaces are arranged apart from each other, the dark portion H is visible therebetween.

[0208] This means that as the fine pitch goes smaller, the shift due to the tilt angle affects the display image. When the (sub) pixel pitch is relatively large, the ratio of the shifted length is relatively small or negligible, but when the (sub) pixel pitch is relatively small, the ratio of the shifted length becomes relatively large, and a dark portion H as in the case of P2 is visible.

[0209] Referring to FIG. 22, the reason for the occurrence of the above-described phenomenon will be schematically explained. When the light-emitting elements 210 and 211 are arranged at the same interval with respect to the bonding surface, in other words, when they are arranged at the same interval with respect to the electrode pads, as in the arrangement shown in FIG. 14, the interval (pitch) between the light-emitting centers G of the light-emitting elements 210 and 211 is repeated as D1 / D2.

[0210] Therefore, depending on the viewing distance of the display device or the overall pixel pitch, a dark portion is visually recognized between the relatively long pitches D2.

[0211] FIG. 22 schematically shows the light emission when the display device is viewed from the front. In this case, as described above with reference to FIG. 19, the inclined light distribution patterns V and V' are shown. However, when viewed from the front, these inclined light distribution patterns V and V' do not substantially affect the viewing of the display.

[0212] That is, when the display device is viewed from the front, only the shift of the light-emitting surface due to the tilt angle has an effect, and the vertical lines caused thereby are hardly visible.

[0213] However, when the display device shown in FIG. 23 is viewed from the side, that is, in the case of the viewing angle, it can be seen that this light-emitting surface shift phenomenon and the difference in brightness due to the light distribution characteristics are aggravated.

[0214] As an example, when the light distribution pattern V and the light-emitting direction G” are different from each other (210). It can be seen that the brightness is relatively weakened, but when the light distribution pattern V' and the light-emitting direction G' are the same (211), the brightness becomes relatively large.

[0215] Due to this aggravated difference in brightness, vertical lines are faintly visible at the viewing angle of the display device.

[0216] FIG. 24 schematically shows the light distribution of the display device with the arrangement of FIG. 15. FIG. 25 shows the light distribution of the display device with the arrangement of FIG. 15 as viewed from the front and a schematic diagram thereof. FIG. 26 shows the light distribution of the display device with the arrangement of FIG. 15 as viewed from the side and a schematic diagram thereof.

[0217] Referring to FIG. 24, it shows that the asymmetric light distributions of the light-emitting elements 210 having the tilt angles described above are canceled out by the symmetric arrangement with respect to the tilt angles of the light-emitting elements 210. This is consistent with what has been described above with reference to FIG. 6.

[0218] In addition to this, it can be seen that there is no shift in the distance between the light-emitting surfaces E, and the distance between the light-emitting surfaces E is constant with D. As an example, the distances between the odd-numbered light-emitting elements 210 and the even-numbered light-emitting elements 211 are all constant with D.

[0219] Referring to FIG. 25, the reason for the above-described phenomenon will be schematically explained. When the light-emitting elements 210 and 211 are arranged at the same interval with respect to the light-emitting surface E as in the arrangement shown in FIG. 15, the interval (pitch) between the light-emitting centers G of the light-emitting elements 210 and 211 is constant with D.

[0220] Therefore, depending on the observation distance of the display device or the overall pixel pitch, a dark portion is visually recognized between relatively long pitches D2.

[0221] FIG. 22 schematically shows the light emission when the display device is viewed from the front. In this case, as described above with reference to FIG. 19, the inclined light distribution patterns V and V' are shown, but when viewed from the front, such inclined light distribution patterns V and V' may not substantially affect when observing the display. Also, since the interval (pitch) between the light-emitting centers G is constant with D, the possibility of the effects by the light distribution patterns V and V' being exerted becomes even smaller.

[0222] That is, when the display device is viewed from the front, since the shift of the light-emitting surface due to the tilt angle does not affect the display implementation, almost no vertical lines are visible due to this.

[0223] On the other hand, when the display device shown in FIG. 26 is viewed from the side, that is, in the case of the viewing angle, since the interval (pitch) between the light-emitting centers G is constant at D, no difference in brightness due to the light distribution characteristics is shown.

[0224] As an example, when the light distribution pattern V and the light-emitting direction G” are different from each other (210), the brightness is relatively weakened. However, when the light distribution pattern V’ and the light-emitting direction G’ are the same (211), it can be seen that the brightness becomes relatively large.

[0225] However, such a difference in brightness is weakened by the interval of the predetermined light-emitting surface E, and there is a possibility that vertical lines are not visible even at the viewing angle of the display device.

[0226] As described above with reference to FIGS. 11 and 13, the positions of the electrodes of the light-emitting elements may be different. As an example, the red light-emitting element 210 may have an electrode arrangement as shown in FIG. 11(A) or may have an electrode arrangement as shown in FIG. 13(A). This is the same for the green and blue light-emitting elements 220 and 230.

[0227] Therefore, the arrangement of the light-emitting elements due to the tilt angle is different for each color phase. This enables various embodiments. According to such various embodiments, various phenomena indicated by the tilt angle of the light-emitting elements or the tilted light distribution patterns V, V’, for example, the phenomenon where a dark part is visible, the phenomenon where vertical lines are visible, the phenomenon of light non-uniformity, etc. can be effectively removed. That is, by configuring the arrays of the light-emitting elements that emit each color phase to be different from each other, various phenomena indicated by the tilt angle of the light-emitting elements or the tilted light distribution patterns V, V’ are effectively offset from each other.

[0228] This will be described below with reference to FIGS. 27 to 32.

[0229] FIG. 27 is a schematic diagram showing the sub-pixel arrangement of a display device using a semiconductor light-emitting element having a tilt angle according to the second embodiment of the present invention.

[0230] Referring to FIG. 27, the arrangement of the green and blue light-emitting elements 220 and 230 is the same as that shown in FIG. 15. However, in the arrangement of the red light-emitting element 211, the arrangement of the first-type electrode (for example, an n-type electrode) and the second-type electrode (for example, a p-type electrode) of the first light-emitting element 211 has a tilt angle that is inclined to the left as it goes to the light-emitting surface E.

[0231] In this case, in the arrangement of the green and blue light-emitting elements 220 and 230, the intervals a, b, and c between the light-emitting surfaces E are all the same (a = b = c), and the distances between the centers of the electrode pads 131, 141 / 132, 142 are variable (A > B, A = C).

[0232] However, in the case of the red light-emitting element 211, the tilt angle is opposite to the tilt angles of the adjacent green and blue light-emitting elements 220 and 230. At this time, in the arrangement of the red light-emitting element 211, the intervals a', b', and c' between the light-emitting surfaces E are all the same (a' = b' = c'), and the distances between the centers of the electrode pads 130, 140 are variable (A' > B', A' = C').

[0233] At this time, the distances A', B', C' between the centers of the electrode pads 130, 140 for the red light-emitting element 211 are different from the distances A, B, C between the centers of the electrode pads 131, 141 / 132, 142 for the green and blue light-emitting elements 220, 230. At this time, in some cases, A is the same as B'.

[0234] FIG. 28 is a schematic diagram showing the sub-pixel arrangement of a display device using a semiconductor light-emitting element having a tilt angle according to the third embodiment of the present invention.

[0235] Referring to FIG. 28, the arrangement of the red and blue light-emitting elements 210 and 230 is the same as that shown in FIG. 15. However, in the arrangement of the green light-emitting element 221, the arrangement of the first-type electrode (for example, an n-type electrode) and the second-type electrode (for example, a p-type electrode) of the first light-emitting element 221 has a tilt angle that is inclined to the left as it goes toward the light-emitting surface E.

[0236] In this case, in the arrangement of the red and blue light-emitting elements 210 and 230, the intervals a, b, and c between the light-emitting surfaces E are all the same (a = b = c), and the distance between the centers of the electrode pads 130, 140 / 132, 142 is variable (A > B, A = C).

[0237] However, in the case of the green light-emitting element 221, the tilt angle is opposite to the tilt angles of the adjacent red and blue light-emitting elements 210 and 230. At this time, in the arrangement of the green light-emitting element 221, the intervals a', b', and c' between the light-emitting surfaces E are all the same (a' = b' = c'), and the distance between the centers of the electrode pads 131, 141 is variable (A' > B', A' = C').

[0238] At this time, the distances A', B', and C' between the centers of the electrode pads 131 and 141 for the green light-emitting element 221 are different from the distances A, B, and C between the centers of the electrode pads 130, 140 / 132, 142 for the red and blue light-emitting elements 210 and 230. At this time, in some cases, A is the same as B'.

[0239] FIG. 29 is a schematic diagram showing the sub-pixel arrangement of a display device using a semiconductor light-emitting element having a tilt angle according to the fourth embodiment of the present invention.

[0240] Referring to FIG. 29, the arrangement of the red and green light-emitting elements 210 and 220 is the same as that shown in FIG. 15. However, in the arrangement of the blue light element 233, the arrangement of the first-type electrode (for example, an n-type electrode) and the second-type electrode (for example, a p-type electrode) of the first light-emitting element 233 has a tilt angle that is inclined to the left as it goes toward the light-emitting surface E.

[0241] In this case, in the arrangement of the red and green light-emitting elements 210 and 220, the intervals a, b, and c between the light-emitting surfaces E are all the same (a = b = c), and the distance between the centers of the electrode pads 130, 140 / 131, 141 is variable (A > B, A = C).

[0242] However, in the case of the blue light-emitting element 233, the tilt angle is opposite to the tilt angles of the adjacent red and green light-emitting elements 210 and 220. At this time, in the arrangement of the blue light-emitting element 233, the intervals a', b', and c' between the light-emitting surfaces E are all the same (a' = b' = c'), and the distance between the centers of the electrode pads 132, 142 is variable (A' > B', A' = C').

[0243] At this time, the distances A', B', C' between the centers of the electrode pads 132, 142 for the blue light-emitting element 233 are different from the distances A, B, C between the centers of the electrode pads 130, 140 / 131, 141 for the red and green light-emitting elements 210, 220. At this time, in some cases, A is the same as B'.

[0244] FIG. 30 is a schematic diagram showing the sub-pixel arrangement of a display device using a semiconductor light-emitting element having a tilt angle according to the fifth embodiment of the present invention.

[0245] Referring to FIG. 30, the arrangement of the blue light-emitting element 230 is the same as that shown in FIG. 15. However, in the arrangement of the red and green light-emitting elements 211, 221, the arrangement of the first-type electrode (for example, an n-type electrode) and the second-type electrode (for example, a p-type electrode) of the first light-emitting element 221 has a tilt angle that is inclined to the left as it goes to the light-emitting surface E.

[0246] In this case, in the arrangement of the blue light-emitting element 230, the intervals a, b, and c between the light-emitting surfaces E are all the same (a = b = c), and the distance between the centers of the electrode pads 132, 142 is variable (A > B, A = C).

[0247] However, in the case of the red and green light-emitting elements 211 and 221, the tilt angle is opposite to that of the adjacent blue light-emitting element 230. At this time, in the arrangement of the red and green light-emitting elements 211 and 221, the intervals a', b', and c' between the light-emitting surfaces E are all the same (a' = b' = c'), and the distances between the centers of the electrode pads 130, 140 / 131, 141 are variable (A' > B', A' = C').

[0248] At this time, the distances A', B', and C' between the centers of the electrode pads 130, 140 / 131, 141 with respect to the red and green light-emitting elements 211 and 221 are different from the distances A, B, and C between the centers of the electrode pads 132, 142 with respect to the blue light-emitting element 230. At this time, in some cases, A is the same as B'.

[0249] FIG. 31 is a schematic diagram showing the sub-pixel arrangement of a display device using a semiconductor light-emitting element having a tilt angle according to the sixth embodiment of the present invention.

[0250] Referring to FIG. 31, the arrangement of the green light-emitting elements 220 is the same as that shown in FIG. 15. However, in the arrangement of the red and blue light-emitting elements 211 and 233, the arrangement of the first-type electrode (for example, n-type electrode) and the second-type electrode (for example, p-type electrode) of the first light-emitting elements 211 and 233 has a tilt angle that is tilted to the left as it goes to the light-emitting surface E.

[0251] In this case, in the arrangement of the green light-emitting elements 220, the intervals a, b, and c between the light-emitting surfaces E are all the same (a = b = c), and the distances between the centers of the electrode pads 131, 141 are variable (A > B, A = C).

[0252] However, in the case of the red and blue light-emitting elements 211 and 233, the tilt angle is opposite to that of the adjacent green light-emitting element 220. At this time, in the arrangement of the red and blue light-emitting elements 211 and 233, the intervals a', b', and c' between the light-emitting surfaces E are all the same (a' = b' = c'), and the distances between the centers of the electrode pads 130, 140 / 132, 142 are variable (A' > B', A' = C').

[0253] At this time, the distances A', B', and C' between the centers of the electrode pads 130, 140 / 132, 142 for the red and blue light-emitting elements 211, 233 are different from the distances A, B, and C between the centers of the electrode pads 131, 141 for the green light-emitting element 220. At this time, in some cases, A is the same as B'.

[0254] FIG. 32 is a schematic diagram showing the sub-pixel arrangement of a display device using a semiconductor light-emitting element having a tilt angle according to the seventh embodiment of the present invention.

[0255] Referring to FIG. 32, the arrangement of the red light-emitting elements 210 is the same as that shown in FIG. 15. However, the arrangements of the green and blue light-emitting elements 221, 233 have a tilt angle such that the arrangement of the first-type electrode (for example, an n-type electrode) and the second-type electrode (for example, a p-type electrode) of the first light-emitting elements 221, 233 is tilted to the left as it goes toward the light-emitting surface E.

[0256] In this case, in the arrangement of the red light-emitting elements 210, the intervals a, b, and c between the light-emitting surfaces E are all the same (a = b = c), and the distance between the centers of the electrode pads 130, 140 is variable (A > B, A = C).

[0257] However, in the case of the green and blue light-emitting elements 221, 233, the tilt angle is opposite to the tilt angle of the adjacent red light-emitting elements 210. At this time, in the arrangements of the green and blue light-emitting elements 221, 233, the intervals a', b', and c' between the light-emitting surfaces E are all the same (a' = b' = c'), and the distance between the centers of the electrode pads 131, 141 / 132, 142 is variable (A' > B', A' = C').

[0258] At this time, the distances A', B', and C' between the centers of the electrode pads 131, 141 / 132, 142 for the green and blue light-emitting elements 221, 233 are different from the distances A, B, and C between the centers of the electrode pads 130, 140 for the red light-emitting elements 210. At this time, in some cases, A is the same as B'.

[0259] In this way, when the light-emitting elements are symmetrically positioned in pairs with adjacent pixels, the tilted light distributions a and b based on the crystal structure of the light-emitting elements cancel each other out, and a uniform light distribution can be formed.

[0260] Thereby, when viewing the display device from the outside, the problem that the hue changes according to the viewing direction can also be solved.

[0261] On the other hand, when viewing the display device from the side direction, that is, in the case of the viewing angle, since the interval (pitch) between the light-emitting centers G is constant at D, the difference in brightness due to the light distribution characteristics can be made not to appear.

[0262] Also, according to various embodiments, various phenomena caused by the tilt angle of the light-emitting elements or the tilted light distribution patterns V, V', such as the phenomenon where a dark part is visually recognized, the phenomenon where vertical lines are visually recognized, the phenomenon of light non-uniformity, etc. can be effectively removed.

[0263] It can be understood that such a phenomenon is that after positioning the cover film on the array of the light-emitting elements, the difference in light intensity that was finely present between the red light, green light, and blue light is further reduced, and uniform light is emitted.

[0264] The above description is merely an exemplary explanation of the technical idea of the present disclosure. Those having ordinary knowledge in the technical field to which the present disclosure belongs can make various modifications and deformations without departing from the essential characteristics of the present disclosure.

[0265] Also, the embodiments shown in the present disclosure are not intended to limit the technical idea of the present disclosure, but are for explanatory purposes. Therefore, the scope of the technical idea of the present disclosure is not limited by these embodiments.

[0266] The protection scope of the present disclosure should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present disclosure.

Claims

1. A display device using a light-emitting element, A wiring substrate on which a plurality of unit pixels are defined; an electrode pad disposed in the unit pixel and defining a plurality of unit subpixels; and a light emitting element having two side surfaces tilted to one side and a bonding surface electrically connected to the electrode pad; the two side surfaces of the light emitting element face each other along a spacing direction of a pair of electrode pads for the light emitting element; Two adjacent light-emitting elements are arranged symmetrically with respect to the tilt angle, A display device, characterized in that a distance between the centers of two pairs of electrode pads for the two light-emitting elements is variable depending on an inclination direction of the two side surfaces of each of the two light-emitting elements.

2. The display device according to claim 1, wherein the two light emitting elements are arranged such that the same electrode polarities face each other.

3. 2. The display device according to claim 1, wherein the distance between the centers of the two pairs of electrode pads is determined by compensating for a shift of the light emitting surface of the light emitting element relative to the joint surface due to the tilt angle.

4. The display device according to claim 1 , wherein a distance between the centers of the two pairs of electrode pads is variable along one direction in which light emitting elements emitting light of the same color are arranged.

5. 2. The display device according to claim 1, wherein the polarities of the light emitting elements facing each other and corresponding to the two adjacent electrode pads are the same.

6. The distance between the centers of the two pairs of electrode pads is: a first distance corresponding to a tilt angle at which the light emitting surfaces of the light emitting elements approach each other; and 2. The display device of claim 1, further comprising: a second distance corresponding to a tilt angle at which the light emitting surfaces of the light emitting elements are apart from each other.

7. The display device according to claim 6, wherein the first distance and the second distance are repeatedly positioned.

8. The display device of claim 6, wherein the second distance is smaller than the first distance.

9. The display device according to claim 6, wherein the distance between the light emitting surfaces of the light emitting elements corresponding to the first distance and the second distance is the same.

10. The display device according to claim 6 , wherein the distances between the bonding surfaces of the light emitting devices corresponding to the first distance and the second distance are different.

11. A display device using a light-emitting element, A wiring substrate on which a plurality of unit pixels are defined; an electrode pad disposed in the unit pixel and defining a plurality of unit subpixels; and a light emitting element having two side surfaces tilted to one side and a bonding surface electrically connected to the electrode pad; the two side surfaces of the light emitting element face each other along a spacing direction of a pair of electrode pads for the light emitting element; The light emitting device includes a first light emitting device that emits light of a first color along a first direction, The first light emitting element includes a 1-1 light emitting element, a 1-2 light emitting element, and a 1-3 light emitting element that are positioned consecutively, a first distance between the first light emitting element and the second light emitting element is different from a second distance between the second light emitting element and the third light emitting element; The first distance is a distance between the centers of the bonding surfaces of the 1-1 light emitting element and the 1-2 light emitting element, The display device, wherein the second distance is a distance between centers of bonding surfaces of the first-second light emitting element and the first-third light emitting element.

12. The display device according to claim 11, characterized in that the distance between the centers of two pairs of electrode pads for two adjacent first light-emitting elements differs depending on the inclination direction of the two side surfaces of each of the two first light-emitting elements.

13. The display device according to claim 12, wherein the distance between the centers of the two pairs of electrode pads is determined by compensating for a shift of the light emitting surface of the light emitting element relative to the joint surface due to the tilt angle.

14. a second light-emitting element that emits light of a second hue along a second direction, and a third light-emitting element that emits light of a third hue along a third direction, Among the first light emitting device, the second light emitting device, and the third light emitting device, adjacent first light emitting device, second light emitting device, and third light emitting device form one unit pixel, The display device of claim 11, wherein a direction of a tilt angle of the second light emitting element is different from at least one of the tilt angles of the first light emitting element and the third light emitting element.

15. The display device of claim 14, wherein the shift of the light emitting surface of the light emitting element according to the tilt angle is the same within the unit pixel.

16. 12. The display device of claim 11, wherein the first-1 light emitting element and the first-2 light emitting element are positioned symmetrically with respect to the tilt angle so that the electrode polarities in the directions facing each other are the same.

17. A display device using a light-emitting element, A wiring substrate on which a plurality of unit pixels are defined; an electrode pad disposed in the unit pixel and defining a plurality of unit subpixels; and a light emitting element having two side surfaces tilted to one side and a bonding surface electrically connected to the electrode pad; the two side surfaces of the light emitting element face each other along a spacing direction of a pair of electrode pads for the light emitting element; adjacent light emitting elements along a first direction in which a first light emitting element emitting light of a first color is arranged are symmetrically positioned with respect to the tilt angle such that the electrode polarities of the light emitting elements facing each other are the same; A display device, wherein a sub-pixel pitch defined by a distance between the centers of two pairs of electrode pads varies depending on a direction of the tilt angle.

18. the sub-pixel pitch comprises a first sub-pixel pitch and a second sub-pixel pitch; The display device of claim 17, wherein the first sub-pixel pitch and the second sub-pixel pitch are alternately positioned along the first direction.

19. The display device of claim 18, wherein a distance between bonding surfaces of the light emitting devices corresponding to the first sub-pixel pitch and the second sub-pixel pitch is different from each other.

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