A display transfer structure including the light emitting elements and a transfering method of light emitting elements

Abstract

The present disclosure provides a display transfer structure having a light-emitting element transferred thereon and a method for transferring the light-emitting element. The light-emitting element of the display transfer structure has a rotationally asymmetric planar shape, so that a gap between a first electrode and a second electrode disposed on the light-emitting element can be secured, and accordingly, the possibility of defects occurring due to alignment errors can be reduced and the light-emitting area can be expanded.

Description

Technology Field

[0001] An exemplary embodiment of the present disclosure relates to a display transfer structure comprising a light-emitting element and a method for transferring a light-emitting element. Background Technology

[0002] Recently, prototype LED (Light Emitting Diode) displays are self-emissive displays in which light-emitting elements in the μm range are mounted at the pixel positions of a driving substrate, offering advantages such as high brightness, high power efficiency, long lifespan, and the ability to implement various form factors. Micro LED displays can have high efficiency, high image quality, and high resolution compared to conventional LCD or OLED displays.

[0003] However, the transfer process for positioning micro LEDs in the μm range at pixel locations on a driver substrate is currently carried out using the pick-and-place method, but this method makes it difficult to guarantee productivity and economic efficiency. For example, even if only 0.1% of defects occur in the process, the large number of micro LEDs transferred causes a disruption requiring the individual additional transfer of hundreds or more micro LEDs. Therefore, there is a growing need for a different method to manufacture large-area micro LED displays.

[0004] In addition, while reducing the size of micro LEDs is advantageous in terms of economic feasibility, as the size decreases, the gap between the p-electrode and n-electrode formed on the micro LED also shrinks. This presents a problem in that the likelihood of defects caused by alignment errors increases during the subsequent bonding or metallization processes for electrode connection. The problem to be solved

[0005] According to an exemplary embodiment, a display transfer structure is provided in which a light-emitting element including a rotationally asymmetric shape is transferred.

[0006] According to an exemplary embodiment, a method for transferring a light-emitting element including a rotationally asymmetric shape is provided. means of solving the problem

[0007] A display transfer structure according to an exemplary embodiment includes a substrate having a plurality of wells and a plurality of light-emitting elements disposed in the plurality of wells, wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape and the plurality of wells may have a planar shape different from the planar shape of the plurality of light-emitting elements.

[0008] And, among the plurality of wells, the first well includes a first region and a second region that partially overlap each other, and among the plurality of light-emitting elements, the first light-emitting element may be optionally placed in the first region or the second region.

[0009] In addition, the first region and the second region may have a planar shape corresponding to the planar shape of the first light-emitting element.

[0010] And, the first region of the first well is oriented in the first direction, the second region of the first well is oriented in the second direction, and the first light-emitting element can be oriented in the oriented direction of the first region or the second region where the first light-emitting element is placed.

[0011] Additionally, the first well further includes a third region that partially overlaps with the second region, the first light-emitting element is placed in the first region, and among the plurality of light-emitting elements, the second light-emitting element may be placed in the third region.

[0012] In addition, at least one of the plurality of light-emitting elements includes a spaced-apart first electrode and a second electrode, and a plurality of first electrode pads and second electrode pads are spaced-apart and disposed on a substrate, and one of the plurality of first electrode pads is electrically connected to the first electrode, and one of the plurality of second electrode pads can be electrically connected to the second electrode.

[0013] Additionally, among the multiple wells, adjacent first and second wells may be included in one subpixel.

[0014] For example, the first well and the second well are rotationally symmetric with respect to a predetermined central axis perpendicular to the substrate, and the first and second electrode pads placed in the first well may be rotationally symmetric with respect to the predetermined central axis with respect to the first and second electrode pads placed in the second well.

[0015] For example, the first and second wells are arranged in an arc shape with respect to a predetermined central axis perpendicular to the substrate, and the first and second electrode pads of the substrate may have an arc or ring shape with respect to the predetermined central axis.

[0016] And, among the plurality of wells, the first well includes a first region and a second region that partially overlap each other, and the second region is a region obtained by rotating the first region counterclockwise by a first angle with respect to a specific rotation point, and among the plurality of light-emitting elements, the first light-emitting element may be placed on the region where the first region and the second region overlap.

[0017] For example, the first region is oriented in a first direction, the second region is oriented in a second direction in which the first direction is rotated by a first angle, and the first light-emitting element is oriented and arranged in a direction rotated by a second angle from the first direction, and the second angle may be one angle within 0 degrees to the first angle.

[0018] And, among the plurality of wells, the first well includes a first region and a second region that partially overlap each other, and the second region is a region obtained by translating the first region by a first distance with respect to a specific direction, and among the plurality of light-emitting elements, the first light-emitting element is disposed on the region where the first region and the second region overlap, the first region and the second region are oriented in a first direction, and the first light-emitting element can be disposed oriented in the first direction.

[0019] Additionally, a plurality of light-emitting elements include a first light-emitting element having a tapered planar shape, and a plurality of wells include a first well having a tapered planar shape that is equal to or greater than the degree of tapering of the first light-emitting element, and among the surfaces intersecting the tapered centerline of the first light-emitting element, a smaller surface and a larger surface may be arranged to face the smaller surface and the larger surface among the surfaces intersecting the tapered centerline of the first well, respectively.

[0020] And, among the plurality of wells, the first well has a circular plane, and among the plurality of light-emitting elements, the first light-emitting element is placed in the first well, the diameter of the circle is greater than the maximum length of the first light-emitting element, and the distance between the first electrode and the second electrode included in the first light-emitting element may be greater than the distance between the center of the first well and the second electrode.

[0021] For example, the plane of at least one of the plurality of light-emitting elements may have a trapezoidal shape, a truncated fan shape, or a polygonal shape.

[0022] For example, the planar shape of at least one of the plurality of light-emitting elements is a trapezoidal shape or a truncated fan shape, and a first electrode and a second electrode may be disposed in different regions of at least one light-emitting element based on the tapered centerline of at least one light-emitting element.

[0023] For example, the planar shape of at least one of the plurality of light-emitting elements may have a linearly asymmetric shape.

[0024] In addition, the plurality of wells includes a third well and a fourth well having different shapes, and the plurality of light-emitting elements may include a third light-emitting element exclusively disposed in the third well and a fourth light-emitting element having a shape different from the third light-emitting element and exclusively disposed in the fourth well.

[0025] A display transfer structure according to an exemplary embodiment includes a substrate comprising a plurality of wells and a plurality of light-emitting elements disposed in the plurality of wells, wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, and among the plurality of wells, adjacent first wells and second wells are included in one subpixel, and the first wells and second wells are each oriented in a first direction and a second direction which is different from the first direction, and the light-emitting element disposed in the first region is oriented in the first direction, and the light-emitting element disposed in the second region can be oriented in the second direction.

[0026] A method for transferring a light-emitting element according to an exemplary embodiment includes the steps of preparing a substrate having a plurality of wells and transferring a plurality of light-emitting elements having a rotationally asymmetric planar shape to the plurality of wells, wherein the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, and among the plurality of wells, a first well includes a first region and a second region that partially overlap each other, and the transfer step may include the step of selectively inserting a first light-emitting element among the plurality of light-emitting elements into the first region in a first direction or into the second region in a second direction. Effects of the invention

[0027] A display transfer structure according to an exemplary embodiment can reduce the occurrence of defects caused by alignment errors and expand the light-emitting area by ensuring a gap between electrodes, while at the same time allowing light-emitting elements to be arranged in multiple directions.

[0028] A light-emitting element of a display transfer structure according to an exemplary embodiment has a rotationally asymmetric shape, thereby securing a gap (electrode gap) between a first electrode and a second electrode disposed on the light-emitting element, which can reduce the occurrence of defects caused by alignment errors and expand the light-emitting area.

[0029] A substrate well of a display transfer structure according to an exemplary embodiment includes a first region and a second region, so that a light-emitting element can be disposed in the first region in a first direction or disposed in the second region in a second direction, thereby increasing the transfer efficiency (yield).

[0030] A substrate of a display transfer structure according to an exemplary embodiment includes a plurality of wells in one subpixel, thereby increasing the transfer efficiency (yield).

[0031] A substrate well of a display transfer structure according to an exemplary embodiment includes a first region and a second region, and a light-emitting element can be placed in the region where the first region and the second region overlap, thereby increasing the transfer efficiency (yield).

[0032] According to an exemplary embodiment, the light-emitting element of the display transfer structure has a tapered planar shape, and the well of the substrate has a tapered planar shape that is equal to or greater than the degree of tapering of the light-emitting element, so that the light-emitting element can be arranged in multiple directions rather than in one direction inside the well, thereby increasing the transfer efficiency (yield).

[0033] When the substrate well of the display transfer structure according to an exemplary embodiment has a circular shape, the light-emitting element having a rotationally asymmetric planar shape can secure a larger electrode spacing than the light-emitting element having a rotationally symmetric planar shape, thereby reducing the occurrence of defects caused by alignment errors.

[0034] The light-emitting element of the display transfer structure according to an exemplary embodiment has a rotational asymmetry and a linear asymmetry shape, which can reduce the occurrence of defects caused by alignment errors, and if the well shape is made so that the light-emitting element can be inserted even when rotated, the reduction in transfer yield due to rotational asymmetry can be reduced. In addition, since it has a linear asymmetry shape, there is no case where it is transferred upside down, so electrical connection defects after transfer can be minimized.

[0035] A display transfer structure according to an exemplary embodiment allows a light-emitting element to be transferred over a large area and can be easily adopted in a large display device.

[0036] The light-emitting element transfer method according to an exemplary embodiment can efficiently align light-emitting elements over a large area. Therefore, the light-emitting element transfer method can be applied to the fabrication of large display devices, and the unit cost of the display device can be lowered by reducing the cost of large-area transfer. Brief explanation of the drawing

[0037] FIG. 1 is a schematic diagram showing a light-emitting element placed on a substrate in a display transfer structure according to an exemplary embodiment. FIG. 2 is a schematic diagram showing the flowchart of a method for transferring a light-emitting element according to an exemplary embodiment. FIG. 3 is a diagram showing an electrode pad according to an exemplary embodiment placed on a different substrate. FIG. 4 is a drawing showing an electrode pad placed in a part of a well according to an exemplary embodiment. FIG. 5 is a schematic diagram showing a display transfer structure according to an exemplary embodiment in which the arrangement direction of electrode pads connected to a first well and the direction of electrode pads connected to a second well are opposite. FIG. 6 is a schematic diagram showing that the well of a display transfer structure according to an exemplary embodiment further includes a third region. FIG. 7 is a schematic diagram showing that the well of a display transfer structure according to an exemplary embodiment further includes a third region and a fourth region. FIG. 8 is a schematic diagram showing the shape of a well and an electrode pad of a display transfer structure according to an exemplary embodiment. FIG. 9 is a schematic diagram showing the shape of a well and an electrode pad of a display transfer structure according to an exemplary embodiment. FIG. 10 shows a light-emitting element and a well of a display transfer structure according to an exemplary embodiment, and shows that the light-emitting element is placed on an area where the first region and the second region of the well overlap. FIG. 11 shows a light-emitting element and a well of a display transfer structure according to an exemplary embodiment, and shows that the light-emitting element is placed on an area where the first region and the second region of the well overlap. FIG. 12 is a drawing showing that the light-emitting element and well of a display transfer structure according to an exemplary embodiment have a tapered planar shape. FIG. 13 is a drawing showing that the light-emitting element and well of a display transfer structure according to an exemplary embodiment have a tapered planar shape. FIG. 14 is a drawing showing that the light-emitting element and well of a display transfer structure according to an exemplary embodiment have a tapered planar shape. FIG. 15 is a drawing showing that the first well of a display transfer structure according to an exemplary embodiment is circular in shape and the light-emitting element is trapezoidal in shape. FIGS. 16a, 16b, and 16c are schematic diagrams showing light-emitting elements having various shapes without rotational symmetry other than the trapezoidal shape of a display transfer structure according to an exemplary embodiment. FIGS. 17a, 17b, 17c, and 17d are schematic diagrams illustrating a light-emitting element having a shape without rotational symmetry and line symmetry of a display transfer structure according to an exemplary embodiment. FIG. 18 is a schematic diagram showing that light-emitting elements having different shapes are inserted into a plurality of wells having different shapes of a display transfer structure according to an exemplary embodiment. FIG. 19(a) is a schematic diagram showing a display transfer structure according to an exemplary embodiment. FIG. 19(b) is a schematic diagram showing a display transfer structure according to an exemplary embodiment. FIG. 20 is a block diagram of an electronic device including a display device according to an exemplary embodiment. FIG. 21 illustrates an example in which a display device according to an exemplary embodiment is applied to a mobile device. FIG. 22 illustrates an example in which a display device according to an exemplary embodiment is applied to a vehicle. FIG. 23 illustrates an example in which a display device according to an exemplary embodiment is applied to augmented reality glasses or virtual reality glasses. FIG. 24 illustrates an example in which a display device according to an exemplary embodiment is applied to large signage. FIG. 25 illustrates an example in which a display device according to an exemplary embodiment is applied to a wearable display. Specific details for implementing the invention

[0038] Hereinafter, embodiments will be described in detail with reference to the attached drawings. The described embodiments are merely illustrative, and various modifications are possible from these embodiments. In the following drawings, the same reference numerals refer to the same components, and the size of each component in the drawings may be exaggerated for clarity and convenience of explanation.

[0039] In the following, terms described as "upper" or "upper" may include not only those directly above in contact, but also those above without contact.

[0040] A singular expression includes plural expressions unless the context clearly indicates otherwise. Furthermore, when a part is said to "include" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0041] The use of the term “above” and similar descriptive terms may apply to both the singular and plural forms.

[0042] The meaning of “connection” can include not only physical connections but also optical connections, electrical connections, etc.

[0043] Furthermore, the use of all exemplary terms (e.g., etc.) is merely intended to describe the technical concept in detail, and unless limited by the claims, such terms do not limit the scope of the rights.

[0044] Terms such as "first," "second," etc., may be used to describe various components, but components should not be limited by these terms. The terms are used solely for the purpose of distinguishing one component from another.

[0045] Planar shape can refer to the shape of the device in a top-plan view.

[0046] A rotationally asymmetric planar shape can mean that when a specific shape is rotated about a central axis by an angle of less than 360 degrees, it is not identical to the original planar shape, and only when rotated 360 degrees does it have the same planar shape as the original. For example, circles, equilateral triangles, squares, and rectangles have planar shapes that are symmetric within 360 degrees upon rotation, whereas sectors and trapezoids do not have planar shapes that are symmetric within 360 degrees upon rotation.

[0047] A linearly asymmetric planar shape can mean that the two sides are asymmetric with respect to any straight line passing through the planar shape.

[0048] The first direction, the second direction, etc., may represent the orientation direction of a specific well or the orientation direction of the planar shape of a light-emitting element located in a specific well. When rotating the planar shape with respect to an arbitrary rotation point, if the plane has a rotationally asymmetric shape, the first direction and the second direction may not be the same unless the rotation angles are identical.

[0049] The first direction and the second direction may be the orientation directions of a light-emitting element placed in a specific well (e.g., the first well). That is, the first direction and the second direction may represent the direction in which the light-emitting element is oriented when placed in the first region of the first well and the direction in which the light-emitting element is oriented when placed in the second region of the first well, respectively. Accordingly, the direction in which the light-emitting element is oriented when placed in the first region of the second well may be the same as or different from the first direction (the direction in which the light-emitting element is oriented when placed in the first region of the first well).

[0050] The light-emitting element, substrate, and well of the display transfer structure according to an exemplary embodiment may each refer to the light-emitting element, substrate, and well of the light-emitting element transfer method according to an exemplary embodiment.

[0051] FIG. 1 is a schematic diagram showing a light-emitting element (200) placed on a substrate (100) in a display transfer structure (10) according to an exemplary embodiment, and FIG. 2 is a schematic diagram showing a flowchart of a light-emitting element transfer method.

[0052] According to FIGS. 1 and 2, a display transfer structure (10) according to an exemplary embodiment comprises a substrate (100) having a plurality of wells (110, 120) and a plurality of light-emitting elements (200) disposed in the plurality of wells (110, 120), and the light-emitting elements (200) have a rotationally asymmetric planar shape. At least one of the plurality of wells (110, 120) includes a first region (111, 121) and a second region (112, 122) that partially overlap each other, and at least one of the plurality of light-emitting elements (200) may be disposed in the first region (111, 121) or the second region (112, 122), and each of the plurality of wells (110, 120) may have a shape different from the planar shape of the light-emitting elements (200). A method for transferring a light-emitting element (200) according to an exemplary embodiment includes the step (S100) of preparing a substrate (100) having a plurality of wells (110, 120), and the step (S200) of transferring a plurality of light-emitting elements (200) having a rotationally asymmetric planar shape to a plurality of wells (110, 120), wherein at least one of the plurality of wells (110, 120) includes a first region (111, 121) and a second region (112, 122) that partially overlap each other, and the wells (110, 120) have a shape different from the planar shape of the light-emitting element (200), and in the transfer step (S200), a portion of the light-emitting element (200) may be oriented toward a first direction (D1) and inserted into the first region (111), and a portion may be oriented toward a second direction (D2) and inserted into the second region (112). Since the plane of the light-emitting element (200) has a shape without rotational symmetry, the distance between the first electrode (210) and the second electrode (220) on the light-emitting element (200) can be increased, thereby reducing the occurrence of defects due to alignment errors, and as the area occupied by the first electrode (210) and the second electrode (220) is reduced, the light-emitting area can be expanded.In addition, since the plurality of wells (110, 120) of the substrate (100) include a plurality of regions, the light-emitting element (200) can be oriented in one of a plurality of directions, so the transfer efficiency can be increased.

[0053] A substrate (100) having a plurality of wells (110, 120) and a plurality of light-emitting elements (200) of a display transfer structure (10) according to an exemplary embodiment of a light-emitting element transfer process will be described. The latter may correspond to a plurality of substrates (100) and a plurality of light-emitting elements (200) of a light-emitting element transfer method according to an exemplary embodiment.

[0054] A substrate (100) including a plurality of wells (110, 120) is prepared (S100). At this time, the substrate (100) may be a driving substrate, or it may be an interposer that temporarily arranges light-emitting elements (200) before transferring them to the driving substrate. The substrate (100) may be a single layer, or it may be a multilayer comprising a plurality of layers. The substrate (100) may include a plurality of wells (110, 120), and light-emitting elements (200) may be placed or transferred in the plurality of wells (110, 120). Each of the plurality of wells (110, 120) may have a shape and size in which one light-emitting element (200) can be placed, or may have a shape and size in which a plurality of light-emitting elements (200) can be placed. The shape and size of multiple wells (110, 120) may have the same shape with a size slightly larger than the size of the light-emitting element (200) so that the light-emitting element (200) can be easily placed or transferred.

[0055] Alternatively, a light-emitting element (200) may be placed or transferred in a region (111, 112, 121, 122) that includes a plurality of wells (110, 120). The region (111, 112, 121, 122) may have a shape and size in which a single light-emitting element (200) can be placed, or it may have a shape and size in which a plurality of light-emitting elements (200) can be placed. The shape and size of the region (111, 112, 121, 122) may have the same shape with a size slightly larger than that of the light-emitting element (200) so that the light-emitting element (200) can be easily placed or transferred. If the plurality of wells (110, 120) include a plurality of regions (111, 112, 121, 122) that partially overlap each other, the shape and size of the plurality of wells (110, 120) may differ from that of the light-emitting element (200).

[0056] Each of the multiple wells (110, 120) may have the same size and shape, but the multiple wells (110, 120) may have different shapes so that a light-emitting element (200) having a different shape can be placed or transferred. For example, if the light-emitting element (200) emitting red light (R), green light (G), and blue light (B) each has a different planar shape, the multiple wells may have three different planar shapes. Three light-emitting elements (200) may each be exclusively placed or transferred to the multiple wells having three different planar shapes. Alternatively, each one region included in each of the multiple wells may have the same size and shape, but may also have different shapes.

[0057] The wells (110, 120) and the upper surface excluding the wells of the substrate (100) may each be made of a different material, and accordingly, a difference in surface energy may occur. Due to the difference in surface energy, the light-emitting element (200) may be placed or transferred to the wells (110, 120) in one of the directions in which the electrodes (210, 220) placed on the light-emitting element (200) face the wells (110, 120) or in the direction in which the electrodes (210, 220) face the open opening. Since the light-emitting element (200) is placed to the wells (110, 120) in one direction due to the difference in surface energy, defects during electrical connection after the transfer of the light-emitting element can be minimized.

[0058] A plurality of light-emitting elements (200) having a rotationally asymmetric planar shape are supplied onto a substrate (100), and at least one of the plurality of light-emitting elements (200) is transferred to one of the plurality of wells (110, 120) (S200). Fluidic Self Assembly (FSA) may be used as a method for inserting the light-emitting elements (200) into the substrate (100). Fluidic Self Assembly may be a method in which a plurality of light-emitting elements (200) are supplied to the substrate (100), and appropriate stimuli such as vibration, tilt, or pressure are applied so that the plurality of light-emitting elements (200) are assembled at a predetermined location on the substrate (100).

[0059] In wet self-assembly, a plurality of light-emitting elements (200) may be suspended in a solvent to form a suspension. A method of supplying a plurality of light-emitting elements (200) onto a substrate (100) may include suspending a plurality of light-emitting elements (200) in a suspension and supplying the suspension onto the substrate (100). Various methods may be used to supply the suspension onto the substrate (100), such as a spray method, a dispensing method, an inkjet dot method, or a method of flowing the suspension through an interposer.

[0060] After the suspension is supplied onto the substrate (100), the upper surface of the substrate (100) can be scanned using a blade, roller, or absorbent material, etc., to transfer at least one of the plurality of light-emitting elements (200) to one of the plurality of wells (110, 120). However, this transfer method is not limited to the scanning method and various methods may be used, for example, a method of applying pressure to the suspension from above may be included. During scanning, the light-emitting element (200) may be inserted into the well (110, 120) only when oriented in a specific direction, and there may be multiple specific directions.

[0061] The light-emitting element (200) may include, for example, an n-type semiconductor layer, an active layer, and a p-type semiconductor layer. The n-type semiconductor layer may be, for example, an n-type GaN layer, and the p-type semiconductor layer may be a p-type GaN layer. The active layer may have, for example, a quantum well structure or a multiple quantum well structure. However, the light-emitting element (200) is not limited to the above examples.

[0062] The size of the plurality of light-emitting elements (200) may be 1 to 1000 μm. Or it may be 1 to 200 μm or less. Preferably, it may be 100 μm or less. At this time, the size may have various meanings, and for example, it may mean the maximum length (hereinafter, maximum length) among the lengths between two points on the light-emitting elements (200).

[0063] For example, the maximum length of the light-emitting element (200) is L M If so, the maximum length of one region of the well (110,120) is L M L with a larger interval α than M Sum of and α (L MIt may be +α). In this case, the gap α is intended to secure a gap that allows the light-emitting element (200) to be smoothly inserted into the area. Although it may vary depending on the size of the light-emitting element (200), for example, it may be 0.1 to 10 μm. However, it is not limited to this and may be changed considering tolerances and process capabilities. Also, depending on the size of the element, the maximum length of the well (110, 120) may be 1% to 30% longer than the maximum length of the element, but it is not limited to this; it may have a longer length as long as the electrical connection between the electrode (210, 220) of the light-emitting element (200) and the electrode pad (310, 320) of the driving unit is smooth. Alternatively, the gap is not limited to the maximum length, but the well (110, 120) may be formed with a shape having a gap of α in a direction perpendicular to the perimeter line based on the perimeter of the planar shape of the light-emitting element (200). Alternatively, the shape of the well (110, 120) and the shape of the light-emitting element (200) are the same, and the area of ​​the well (110, 120) is the same as the area of ​​the light-emitting element (200) ((L M +α) / L M ) 2 It can have a width of several times. However, it is not limited to this size difference and can have an appropriate size difference.

[0064] As the size of the light-emitting element (200) decreases, the gap (hereinafter, electrode gap) between the first electrode (210) and the second electrode (220) placed on the light-emitting element (200) may gradually decrease. For example, a light-emitting element (200) having a circular plane of 20 μm in size may include a first electrode (210) at the center and a second electrode (220) around the circumference of the circle. In this case, since the first electrode (210) and the second electrode (220) also have a certain size, it may be difficult to secure an electrode gap of 5 μm or more. As the electrode gap decreases, the possibility of defects occurring due to alignment errors increases, and electrode connection may fail.

[0065] Conventionally, the shapes of a plurality of light-emitting elements and a plurality of wells each have rotational symmetry, and in order to be connected to the electrode pads of a driving substrate regardless of the direction in which they are transferred, a first electrode is positioned near the center of the light-emitting element and a second electrode is positioned near the periphery of the light-emitting element. That is, in a light-emitting element having a rotationally symmetric planar shape, the first electrode placed on the light-emitting element can be positioned near the center of the light-emitting element, and the second electrode can be positioned near the periphery of the light-emitting element. In the above case, as the size of the light-emitting element decreases, the electrode spacing between the first electrode and the second electrode also decreases, increasing the possibility of defects occurring due to alignment errors and potentially narrowing the area of ​​the light-emitting region.

[0066] However, the plurality of light-emitting elements (200) of the display transfer structure (10) according to the exemplary embodiment may have a rotationally asymmetric planar shape. If the light-emitting elements (200) have a rotationally asymmetric planar shape, the first electrode (210) may be positioned away from the center of the light-emitting elements (200), so that the first electrode (210) and the second electrode (220) may be positioned with a large electrode spacing. By securing a larger electrode spacing, the light-emitting element transfer method according to the exemplary embodiment can reduce the possibility of defects caused by alignment errors and secure a larger light-emitting area. For example, the electrode spacing may be larger than half the maximum length of the light-emitting elements (200). By securing a larger electrode spacing, the display transfer structure (10) according to the exemplary embodiment may have fewer defects and the brightness may be further improved.

[0067] At least one of the multiple wells (110, 120) may include multiple regions, and one of the multiple regions may partially overlap with one of the remaining regions, or may not overlap. As described above, one of the multiple regions and the light-emitting element (200) may have the same shape, and the one region may have the same size as the light-emitting element (200) or may have a size slightly larger than the size of the light-emitting element (200). The light-emitting element (200) may be placed in one of the multiple regions, and the placed light-emitting element (200) may be oriented in one direction and may not be oriented in any other direction. That is, during transfer, the light-emitting element (200) may not be inserted in a direction other than one direction. For example, the well (110, 120) may include a first region (111, 121) and a second region (112, 122) that partially overlap each other, and a light-emitting element (200) may be placed in the first region (111, 121) or the second region (112, 122). In this case, the light-emitting element (200) placed in the first region (111) of the first well (110) may be oriented in a first direction (D1), and the light-emitting element (200) placed in the second region (112) may be oriented in a second direction (D2).

[0068] As the well (110, 120) includes multiple regions, the shape of the well (110, 120) and the shape of the light-emitting element (200) may differ. For example, the first well (110) may include a first region (111) into which the light-emitting element (200) is inserted while oriented in a first direction (D1) and a second region (112) into which it is inserted while oriented in a second direction (D2), and the first region (111) and the second region (112) may partially overlap. In this case, the light-emitting element (200) may be inserted into the first well (110) only when oriented in the first direction (D1) and the second direction (D2). As the wells (110, 120) include a first region (111, 121) and a second region (112, 122) that partially overlap each other, the shape of the wells (110, 120) and the shape of the light-emitting element (200) may be different.

[0069] The first direction (D1) and the second direction (D2) may be different or the same. If the first direction (D1) and the second direction (D2) are the same direction, the first region (111, 121) and the second region (112, 122) partially overlap, so the second region (112, 122) may be translated from the first region (111, 121). For example, the second region (112, 122) may be translated from the first region (111, 121) in the Y-axis direction. If the first direction (D1) and the second direction (D2) are different directions, the second region (112, 122) may be rotated from the first region (111, 121) with respect to an arbitrary central axis perpendicular to the substrate (100). For example, the second region (112, 122) of FIG. 1 is rotated around an arbitrary central axis within the second electrode (220) region. The second region (112, 122) may be the first region (111, 121) rotated and translated.

[0070] A light-emitting element (200) of a display transfer structure (10) according to an exemplary embodiment may include a first electrode (210) and a second electrode (220) that are spaced apart. In this case, the first electrode (210) and the second electrode (220) may be arranged on the same planar shape of the light-emitting element (200). Additionally, a display transfer structure (10) according to an exemplary embodiment may include a plurality of first electrode pads (310) and a plurality of second electrode pads (320). Some of the plurality of first electrode pads (310) may be connected to each other, and some of the plurality of second electrode pads may be connected to each other. The plurality of first electrode pads (310) and the plurality of second electrode pads (320) may be spaced apart. The first electrode pad (310) can be electrically connected to the first electrode (210) through various methods, and the second electrode pad (320) can be electrically connected to the second electrode (220) through various methods. For example, the electrode pads (310, 320) and the electrodes (210, 220) can each be attached and electrically connected through soldering, ACF (Anisotropic Conductive Film), attachment using wires, etc. After the transfer step (S200), a step of connecting the first electrode pads (310) and the first electrodes (210) respectively, and a step of connecting the second electrode pads (320) and the second electrodes (220) respectively may be included.

[0071] FIG. 3 is a drawing showing electrode pads (310, 320) placed on another substrate (300), and FIG. 4 is a drawing showing electrode pads (310, 320) placed on a part of a well (110, 120).

[0072] According to FIGS. 3 and 4, the first electrode pad (310) and the second electrode pad (320) may each be placed in a part of the well (110, 120), which may be embedded inside the substrate (100) and exposed to a part of the well (110, 120). Alternatively, the first electrode pad (310) and the second electrode pad (320) may be placed on a substrate (300) different from the substrate (100) to cover the opening. If the first electrode (210) of the light-emitting element (200) is located in an area that can be electrically connected to the first electrode pad (310), the first electrode pad (310) and the first electrode (210) can be electrically connected. If the second electrode (220) of the light-emitting element (200) is positioned in an area that can be electrically connected to the second electrode pad (320), the second electrode pad (320) and the second electrode (220) can be electrically connected. The first electrode pad (310) and the second electrode pad (320) are spaced apart, and the area that can be electrically connected by the first electrode pad (310) and the area that can be electrically connected by the second electrode pad (320) may be mutually exclusive.

[0073] The first electrode pad (310) and the second electrode pad (320) of FIG. 1 may be placed on each part of the well (110, 120), or they may be placed on another substrate (300) to cover each part of the well (110, 120). According to FIG. 1, the first electrode pad (310) and the first electrode (210) of the light-emitting element (200) may be electrically connected, and the second electrode pad (320) and the second electrode (220) of the light-emitting element (200) may be electrically connected.

[0074] When the light-emitting element (200) is oriented in the first direction (D1) and inserted into the first well (110) of the substrate (100) (i.e., placed in the first region (111)), the point where the first electrode (210) is located and when the light-emitting element (200) is oriented in the second direction (D2) and inserted into the first well (110) of the substrate (100) (i.e., placed in the second region (112)), the point where the first electrode (210) is located may be included in an area that can be electrically connected to the first electrode pad (310). Likewise, when the first well (110) of the substrate (100) is inserted in the first direction (D1) (i.e., placed in the first region (111)), the point where the second electrode (220) is located and when the light-emitting element (200) is inserted in the first well (110) of the substrate (100) in the second direction (D2) (i.e., placed in the second region (112)) the point where the second electrode (220) is located may be included in an area that can be electrically connected to the second electrode pad (320).

[0075] If the light-emitting element (200) is positioned in any one direction, and the point where the first electrode (210) is located is included in an area that can be electrically connected to the first electrode pad (310), and the point where the second electrode (220) is located is included in an area that can be electrically connected to the second electrode pad (320), then the first well (110) may be formed to further include an area corresponding to that one direction. However, this may be based on the premise that the condition is satisfied that the light-emitting element (200) is not inserted in any other direction other than the first direction (D1), the second direction (D2), and the one direction due to the inclusion of the aforementioned arbitrary area.

[0076] According to FIG. 1, among the plurality of wells (110, 120) of a display transfer structure (10), adjacent first well (110) and second well (120) may be included in one subpixel (SUB1). One or more light-emitting elements (200) inserted into the wells (110, 120) within one subpixel (SUB1) may emit the same color light. Although the first well (110) and the second well (120) in FIG. 1 are shown to have the same shape, they are not limited thereto and the first well (110) and the second well (120) may have different shapes. At least one light-emitting element (200) may be transferred to one subpixel (SUB1). Even if only one light-emitting element (200) is transferred to a subpixel (SUB1) containing multiple wells (110, 120), the subpixel (SUB1) can operate normally, so the transfer yield can be increased.

[0077] FIG. 5 is a schematic diagram showing a display transfer structure (10) in which the arrangement direction of the electrode pads (310, 320) connected to the first well (110) and the arrangement direction of the electrode pads (310, 320) connected to the second well (120) are opposite.

[0078] Referring to FIGS. 1 and 5, the electrode pad placement direction of the first electrode pad (310) and the second electrode pad (320) placed in the first well (110) and the electrode pad placement direction of the first electrode pad (310) and the second electrode pad (320) placed in the second well (120) may be the same or different. For example, as in FIG. 1, if the first well (110) and the second well (120) have the same shape and the two wells (110, 120) are arranged vertically parallel to each other, the first electrode pad (310) may be placed on the left side of the first well (110) and the second electrode pad (320) may be placed on the right side of the first well (110), and the first electrode pad (310) and the second electrode pad (320) may be extended vertically and arranged in the second well (120) in the same manner as the first well (110). At this time, the electrode placement direction of the first electrode pad (310) and the second electrode pad (320) placed in the first well (110) can be said to be the same as the electrode placement direction of the first electrode pad (310) and the second electrode pad (320) placed in the second well (120). According to another example, as shown in FIG. 5, the second well (120) has a 180-degree rotational symmetry with respect to the first well (110), and if the two wells (110, 120) are arranged vertically, the first electrode pad (310) can be placed on the left side of the first well (110), and the second electrode pad (320) can be placed on the right side of the first well (110). At this time, the second electrode pad (320) can be placed on the left side of the second well (120), and the first electrode pad (310) can be placed on the right side of the second well (120). At this time, the placement direction of the electrode pad placed in the first well (110) and the placement direction of the electrode pad placed in the second well (120) may be opposite to each other or rotated symmetrically by 180 degrees.The first electrode pad (310) of the first well (110) and the first electrode pad (310) of the second well (120) may be positioned diagonally and connected to each other, and the second electrode pad (320) of the first well (110) and the second electrode pad (320) of the first well (110) may also be positioned diagonally and connected to each other. The above 180-degree rotational symmetry is not limited to this example, and if the first well (110) and the second well (120) are rotationally symmetric with respect to a specific central axis perpendicular to the substrate, the first electrode pad (310) and the second electrode pad (320) placed in the first well (110) and the first electrode pad (310) and the second electrode pad (320) placed in the second well (120) may be rotationally symmetric with respect to the central axis.

[0079] FIG. 6 is a schematic diagram showing that the well (110, 120) of a display transfer structure (10) according to an exemplary embodiment further includes a third region (113, 123), and FIG. 7 is a schematic diagram showing that the well (110, 120) of a display transfer structure (10) according to one embodiment further includes a third region (113, 123) and a fourth region (114, 124).

[0080] Referring to FIGS. 6 and 7, the well (110, 120) may further include a third region (113, 123), and the light-emitting element (200) may be placed in the third region (113, 123). During the transfer process, the light-emitting element (200) may be oriented in a third direction and inserted into the third region (113, 123). The third direction (D3) may be the same as or different from the first direction (D1), and may be the same as or different from the second direction (D2). The point where the first electrode (210) of the light-emitting element (200) placed in the third region (113, 123) is located may be included in an area that can be electrically connected to the first electrode pad (310), and the point where the second electrode (220) is located may be included in an area that can be electrically connected by the second electrode pad (320). Only a light-emitting element (200) oriented in one of the first to third directions (D1, D2, D3) may be inserted into the first well (110) which further includes a third region (113, 123). The second region (112, 122) and the third region (113, 123) may partially overlap, and the first region (111, 121) and the third region (113, 123) may partially overlap or may not overlap. If the first region (111, 121) and the third region (113, 123) do not partially overlap, two light-emitting elements (200) may be placed in the first region (111, 121) and the third region (113, 123) of the well (110, 120), respectively. However, even if only one light-emitting element (200) is placed in one of the first to third regions (111, 112, 121, 122, 131, 132) of the subpixel (SUB1), the subpixel (SUB1) may be operated.

[0081] At least one light-emitting element (200) may be placed in one well (110, 120). For example, one or two light-emitting elements (200) may be placed in the first to third regions (111, 112, 113) of the first well (110). If a light-emitting element (200) is placed in the second region (112), a light-emitting element cannot be placed in the first region and the third region (111, 113), so only one light-emitting element may be inserted into the first well (100). If a light-emitting element (200) is placed in the first region (111), a light-emitting element (200) may or may not be placed in the third region (113), so one or two light-emitting elements (200) may be placed in the first well (110). If the light-emitting element (200) is placed in the third region (113), the light-emitting element (200) may or may not be placed in the first region (113), so one or two light-emitting elements (200) may be placed in the first well (110).

[0082] The fourth region (114, 124) of FIG. 7 may also be included in the well (110, 120) just like the third region (113, 123). In this case, the fourth region (114, 124) may partially overlap with the third region (113, 123).

[0083] FIG. 8 is a schematic diagram showing the shape of the wells (110, 120) and the shape of the electrode pads (310, 320) of a display transfer structure (10) according to an exemplary embodiment, and FIG. 9 is a schematic diagram showing the shape of the wells (110, 120) and the shape of the electrode pads (310, 320) of a display transfer structure (10) according to another embodiment.

[0084] Referring to FIGS. 8 and 9, the first electrode pad (310) may be placed on the substrate (100) in an arc shape, and the second electrode pad (320) may also be placed on the substrate (100) in an arc shape. The circle formed by the arc of the first electrode pad (310) may be contained within the circle formed by the arc of the second electrode pad (320), and the two circles may be concentric. The first well (110) and the second well (120) may be arranged in an arc shape with respect to an arbitrary central axis (CA1) perpendicular to the substrate (100). The first well (110) and the second well (120) may be rotationally symmetric. The arbitrary central axis (CA1) and the center of the concentric circle may be the same or near each other. If the distance between the first electrode pad (310) and the second electrode pad (320) is equal to or smaller than the maximum distance of the first well (110), the light-emitting element (200) inserted into the first well (110) or the second well (120) can be electrically connected to the driving substrate (100). As shown in FIG. 9, the arc-shaped first and second electrode pads (310, 320) can be extended 360 degrees to have a ring shape. In this case, the first electrode pad (310) closer to the center may have a circular, elliptical, or polygonal shape including the center. The arrangement according to the above exemplary embodiment is limited such that the center axis (CA1) of the first well (110) and the center axis of the second well (120) are the same, the circle formed by the arc of the first electrode pad (310) and the circle formed by the arc of the second electrode pad (320) are concentric, or the center axis (CA1) of the first well (110) is the same as the center of the concentric circle, but it is not limited thereto and may be arranged with slight differences.

[0085] As shown in FIGS. 8 and 9, if the first well (110) and the second well (120) are not arranged parallel to each other, the first direction (D1) of the first well (110) and the first direction of the second well (120) may be different. If the second well (120) is rotated at a certain angle relative to the first well (110), the first direction of the second well (120) may also be rotated at the same certain angle relative to the first direction (D1) of the first well (110).

[0086] As in the exemplary embodiment described above, the first well (110) includes a first region (111) and a second region (112), and the light-emitting element (200) may be placed in either the first region (111) or the second region (112), i.e., one of the two regions. However, it is not limited thereto, and in the following exemplary embodiment, in addition to being placed to fit into one of the two regions (111, 112), it may be placed across the two regions (111, 112).

[0087] FIGS. 10 and FIGS. 11 show a light-emitting element (200) and a well (110, 120) of a display transfer structure (10) according to exemplary embodiments, and show that the light-emitting element is placed on an area where the first region (111, 121) and the second region (112, 122) of the well (110, 120) overlap.

[0088] According to FIGS. 10 and 11, the first well (110) includes a first region and a second region (111, 112) that partially overlap each other, and the second region (112) may be a region obtained by rotating the first region (111) counterclockwise by a first angle (θ) with respect to a specific rotation point (RP) or a region obtained by translating the first region by a first distance with respect to a specific direction.

[0089] Referring to FIG. 10, the first light-emitting element (200) and the first region (111) and second region (112) of the first well according to an exemplary embodiment may each be semicircular in shape. A specific rotation point (RP) may be the center of the semicircle of the first region (110), and the first angle (θ) may be approximately 60 degrees. The first light-emitting element (200) may be placed in the first region (111) or the second region (112), but may also be placed on the area where the first region (111) and the second region (112) overlap. For example, when the first light-emitting element (200) is placed in the first region (111), it may be said to be placed across the exclusive area of ​​the first region (111) and the area where the first region (111) and the second region (112) overlap. The first light-emitting element (200) disposed on the area where the other first region (111) and the second region (112) overlap may be disposed over the area where the first region (111) and the second region (112) overlap, a part of the exclusive area of ​​the first region (111), and a part of the exclusive area of ​​the second region (112). The first electrode (210) and the second electrode (220) of the first light-emitting element (200) may be spaced apart by the longest distance on the planar shape of the first light-emitting element (200) (i.e., the distance between them is approximately the diameter of a semicircle), and the first electrode pad (310) placed in the first well (110) may be arranged in an arc shape of approximately 0 to 60 degrees along the planar shape of the first well (110) so as to be electrically connected to the first electrode (210) of the first light-emitting element (200), and the second electrode pad (320) may be arranged in an arc shape of approximately 180 to 240 degrees with respect to the first well (110) along the planar shape of the first well (110).

[0090] Referring to FIG. 10, the first region (111) may be oriented in a first direction, for example, the angle of the first direction may be 0 degrees relative to a specific rotation point (RP) (here, the center of the semicircle). The second region (112) may be oriented in a second direction, since it is a region rotated by a first angle, i.e., 60 degrees, of the first region, and the angle of the second direction may be 60 degrees relative to the specific rotation point. The first light-emitting element (200) may be placed in the first region (111) of the first well (110) in the first direction, or placed in the second region (112) of the first well (110) in the second direction, or may be placed on an area where the first region and the second region (111, 112) overlap by being oriented in a direction rotated by a second angle relative to the rotation point (RP) from the first direction. Here, the second angle may be any angle within 0 degrees to the first angle. For example, it may be placed in the first well (110) oriented at 10 degrees, 30 degrees, or 55 degrees. That is, the first light-emitting element (200) may be placed in the first well (110) in one of the continuous directions from 0 degrees to 60 degrees. Since the first light-emitting element (200) is placed in the first well (110) only at an angle within the range of 0 degrees to 60 degrees, the first and second electrode pads (310, 320) and the first and second electrodes (210, 220) may be electrically connected to each other.

[0091] Referring to FIG. 11, the first light-emitting element (200) and the first region (111) and second region (112) according to an exemplary embodiment may have a planar shape with a portion removed from a rectangle. The second direction may be the x-axis direction, and the first distance may be the x-axis length (x1) of the first portion. The first light-emitting element (200) may be placed in the first region (111) or the second region (112), but may also be placed on an area where the first region and the second region (111, 112) overlap. For example, when the first light-emitting element (200) is placed in the first region (111), it may be said to be placed across the exclusive area of ​​the first region (111) and the area where the first region and the second region (111, 112) overlap. The first light-emitting element (200) disposed on the area where the other first region and the second region (111, 112) overlap may be disposed over the area where the first region and the second region (111, 112) overlap, a part of the exclusive area of ​​the first region (111), and a part of the exclusive area of ​​the second region (112). The first electrode and the second electrode (210, 220) of the first light-emitting element (200) can be spaced apart by the longest distance on the planar shape of the first light-emitting element (200) (i.e., the distance between them is the length of the long side of a rectangle), and the first electrode pad (310) placed in the first well (110) can be placed on the left side relative to a part of the first well (110) so as to be electrically connected to the first electrode (210) of the first light-emitting element (200), and the second electrode pad (320) can be placed on the right side relative to a part of the first well (110).

[0092] Referring to FIG. 11, the first region and the second region (111, 112) may be oriented in the same first direction. The first light-emitting element (200) may be placed in the first region (111) of the first well (110) in the first direction, or placed in the second region (112) of the first well (110) in the second direction, or placed on the region where the first region and the second region (111, 112) overlap by being oriented in the first direction at a position that is translated parallel to the first direction by a second length with respect to the specific direction. Here, the second length may be any length within 0 to x1. Since the first light-emitting element (200) is not placed in the first well (110) in any direction other than the first direction, the first and second electrode pads (310, 320) and the first and second electrodes (210, 220) may be electrically connected, respectively.

[0093] The rotationally asymmetric planar shape, first angle (θ) value, and first length value of the first light-emitting element (200) and the first well (110) according to the preceding exemplary embodiment are merely exemplary. The first and second electrode pads (310, 320) and the first and second electrodes (210, 220) may be electrically connected to each other, and the light-emitting element is positioned only within an expected directional range, and any other planar shape, angle value, and length value are possible if the plane of the light-emitting element (200) has a rotationally asymmetric shape.

[0094] FIGS. 12 to 14 are drawings showing that the light-emitting element (200) and well (110, 120) of a display transfer structure (10) according to an exemplary embodiment have a tapered planar shape.

[0095] Referring to FIGS. 12 to 14, the light-emitting element (200) of the display transfer structure (10) according to an exemplary embodiment may have a tapered planar shape, and the well (110, 120) may have a tapered planar shape that is equal to or greater than the degree of tapering of the light-emitting element (200) planar shape. At this time, among the surfaces intersecting the tapered centerline (TCL) of the light-emitting element (200), the smaller surface may be positioned facing the smaller surface among the surfaces intersecting the tapered centerline of the well (110, 120), and among the surfaces intersecting the tapered centerline (TCL) of the light-emitting element (200), the larger surface may be positioned facing the larger surface among the surfaces intersecting the tapered centerline of the well (100, 120). When one inclined surface of the light-emitting element (200) is placed in contact with one inclined surface of the planar shape of the first well (110), the light-emitting element (200) may be oriented in a first direction, and when the other inclined surface of the light-emitting element (200) is placed in contact with another inclined surface of the planar shape of the first well (110), the light-emitting element (200) may be oriented in a second direction. Referring to the exemplary embodiment of FIG. 10 above, the planar portion of the first well (110) that overlaps with the light-emitting element (200) when the light-emitting element (200) is placed in contact with one inclined surface of the first well (110) of FIG. 12 may be referred to as the first region. Additionally, when the light-emitting element (200) is placed in contact with another inclined surface of the first well (110), the planar portion of the first well (110) that overlaps with the light-emitting element (200) may be referred to as the second region. Additionally, a specific rotation point can be described as the center of a circle formed by extending a sector arc, and the angle between the first region and the second region with respect to the rotation point can be described as the first angle. When both inclined surfaces of the light-emitting element (200) do not come into contact with the two inclined surfaces of the first well (110) planar shape and are positioned, the light-emitting element (200) can be oriented in one direction between the first direction and the second direction.Each of the first direction and the second direction may be a direction having a discrete angle. For example, for any point, the first direction may be a reference angle of 0 degrees, and the second direction may be a direction rotated 60 degrees from the first direction for any point. The direction between the first direction and the second direction may be any direction within a continuous angle range. For example, if the first direction is 0 degrees and the second direction is 60 degrees, the direction between them may be 1 degree, 30 degrees, or 59.5 degrees. As shown in FIGS. 12 to 14, if the light-emitting element (200) has a tapered planar shape and the first well (110) has a tapered planar shape that is equal to or greater than the degree of tapering of the light-emitting element (200) planar shape, the light-emitting element (200) may be oriented and positioned in the direction between the first direction and the second direction. However, as the angle increases, the light-emitting element (200) may be inserted in an undesirable direction, so it may be preferable that the angle between the first direction and the second direction be 180 degrees or less. If the well (110, 120) includes an area where the light-emitting element (200) can be oriented and arranged in various directions, the transfer efficiency of the light-emitting element (200) may be increased.

[0096] The degree of tapering can represent the degree of slope of an inclined plane and can be expressed by the following mathematical formula.

[0097] [Mathematical Formula 1]

[0098]

[0099] In this case, TPI represents the degree of tapering, A represents the length of the larger diameter or the longer segment of the line segment intersecting the tapered centerline, B represents the length of the smaller diameter or the shorter segment of the line segment intersecting the tapered centerline, and L represents the length of the tapered or the length between the intersection points of the line segment intersecting the tapered centerline.

[0100] According to FIG. 12, the light-emitting element (200) and the wells (110, 120) may have a truncated fan shape. The truncated fan shape may be a shape obtained by removing a fan with a radius R2, which is smaller than R1, from a fan with a radius R1. For example, with respect to a point, the first direction may be 0 degrees and the second direction may be 30 degrees. The light-emitting element (200) may be inserted into the first well (110) with an angle between 0 and 30 degrees. However, 30 degrees is an example and is not limited thereto, and various angles may be possible. An angle of 180 degrees or less may be preferred to prevent insertion in an unintended direction. The first electrode (210) of the light-emitting element (200) may be placed at a vertex portion close to a sector arc (hereinafter AR1) of length R1, and the second electrode (220) may be placed at a vertex further from the first electrode (210) among vertices close to a sector arc (hereinafter AR2) of length R2. However, not limited thereto, the first electrode (210) may be placed near AR1 and the second electrode (220) may be placed near AR2, so that there may be a gap greater than the gap of R2 minus R1. The first electrode pad (310) may be placed in the first well (110) in an arc shape along AR1. Additionally, the second electrode pad (320) may be placed in the first well (110) in an arc shape along AR2, spaced apart from the first electrode pad (310).

[0101] The larger surface among the surfaces intersecting the tapered centerline (TCL) of the light-emitting element (200) may be positioned to face each other. In this case, the first electrode (210) and the first electrode pad (310) may be electrically connected to each other. Similarly, the smaller surface among the surfaces intersecting the tapered centerline (TCL) of the light-emitting element (200) may be positioned to face each other. In this case, the second electrode (220) and the second electrode pad (320) may be electrically connected to each other.

[0102] The light-emitting element (200) of the display transfer structure (10) according to the embodiment of FIG. 12 has a tapered planar shape, but is not limited thereto, and can be inserted into the first well (110) only when the direction between the first direction and the second direction is included therein, and the first electrode (210) can be connected to the first electrode pad (310) and the second electrode (220) can be connected to the second electrode pad (320), and any other shape is possible if the light-emitting element (200) has a rotationally asymmetric shape.

[0103] According to FIG. 13, the light-emitting element (200) and wells (110, 120) of the display transfer structure (10) according to an exemplary embodiment may have a truncated sector shape. Here, the truncated sector shape may be a shape obtained by removing an isosceles triangle from a sector having a radius R1', having two sides of length R2' which is smaller than R1', and having the vertices of the two sides as the center of the sector. For example, the first well (110) may be inserted such that the light-emitting element (200) is oriented in a direction having an angle between 0 and 30 degrees. The first electrode (210) of the light-emitting element (200) may be placed at a vertex portion close to the R1' sector arc, and the second electrode (220) may be placed at a vertex further from the first electrode (210) among the vertices close to the base of the R2' isosceles triangle. The truncated fan shape of Fig. 13 can reduce chip breakage compared to the truncated fan shape of Fig. 12, and the probability of transfer may also be slightly higher.

[0104] According to FIGS. 12 and 13, a first well (110) and a second well (120) may be arranged within a subpixel. For example, if the first direction of the first well is 0 degrees and the second direction is 30 degrees, then the first direction of the second well (120) may be 180 degrees and the second direction may be 210 degrees relative to the first direction of the first well. In this case, the electrode pad placement direction of the first well (110) and the electrode pad placement direction of the second well (120) may be opposite. By including not only the first well (110) but also the second well (120) in the subpixel, the light-emitting element (200) can be transferred to the subpixel in a more diverse direction, thereby increasing the transfer efficiency.

[0105] According to FIG. 14, the light-emitting element (200) and the wells (110, 120) may have a trapezoidal shape. The first direction and the second direction may be the same direction. Referring to the exemplary embodiment of FIG. 11 above, the first well (110) of FIG. 14 may have a first region in which the planar portion of the first well (110) that overlaps with the light-emitting element (200) when the light-emitting element (200) is placed in contact with one inclined surface of the first well (110), and a second region in which the planar portion of the first well (110) that overlaps with the light-emitting element (200) when the light-emitting element (200) is placed in contact with another inclined surface of the first well (110). Additionally, the first direction may be the Y-axis direction, and the distance between the center of the first region and the center of the second region may be the first length. The planar shape of the first well (110) may have a different aspect ratio than the planar shape of the light-emitting element (200). The light-emitting element (200) oriented in the first direction may be inserted into the first well (110). For example, if the upper side of a trapezoid is shorter than the lower side, the upper side of the planar shape of the first well (110) may have a shorter length than the lower side of the planar shape of the light-emitting element (200). For example, the planar shapes of the light-emitting element (200) and the first well (110) may be trapezoids with different aspect ratios, and the upper side:lower side of the planar shape of the light-emitting element (200) may be 1:3, and the upper side:lower side of the planar shape of the first well (110) may be 1:2. The first electrode (210) may be placed at one vertex of the lower side of the planar shape of the light-emitting element (200) and at the vertex further from the first electrode (210) among the two vertices of the upper side. However, it is not limited thereto, and the first electrode (210) may be placed near the lower side and the second electrode (220) may be placed near the upper side, so that the electrode spacing may be greater than the height of the trapezoid. The first electrode pad (310) may be placed in the first well (110) in a straight line shape along the lower side of the planar shape of the first well (110).Additionally, the second electrode pad (320) may be spaced apart from the first electrode pad (310) and positioned in the first well (110) in a straight line shape along the upper edge of the planar shape of the first well (110).

[0106] According to FIG. 14, a first well (110) and a second well (120) may be disposed within a subpixel. The second well (120) may have a shape obtained by rotating the first well (110) by 180 degrees. In this case, the electrode pad placement direction (first direction) of the first well (110) and the electrode pad placement direction (second direction) of the second well (120) may be symmetrical by rotation by 180 degrees. Since the subpixel includes not only the first well (110) but also the second well (120), the light-emitting element (200) can be transferred to the subpixel in multiple directions (first direction or second direction), thereby increasing the transfer efficiency.

[0107] The light-emitting element (200) of the display transfer structure according to the exemplary embodiment of FIG. 14 has a tapered plane in the shape of a trapezoid, but is not limited thereto, and can be inserted into the first well (110) only when oriented in the first direction, and the first electrode (210) can be connected to the first electrode pad (310) and the second electrode (220) can be connected to the second electrode pad (320), and any other shape is possible if the light-emitting element (200) has a rotationally asymmetric planar shape.

[0108] FIG. 15 is a drawing showing that the first well (110) is circular in shape and the light-emitting element (200) is trapezoidal in shape.

[0109] Referring to FIG. 15, the first well (110) has a circular plane, and the diameter of the circle is greater than the longest length of the placed light-emitting element (200). The placed light-emitting element (200) can be oriented in any direction. Even if the light-emitting element (200) is oriented in any direction and inserted, the first electrode (210) and the second electrode (220) of the light-emitting element (200) can be electrically connected to the first electrode pad (310) and the second electrode pad (320), respectively. The first electrode (210) of the light-emitting element (200) can be placed at a certain distance from the lower edge of the plane shape, and the second electrode (220) can be placed near the upper edge of the plane shape. The first electrode pad (310) can be placed in the center of the first well (110) in various shapes such as a circle, an ellipse, or a polygon. In this case, a circle may be preferred. The second electrode pad (320) may be arranged in a ring shape or a plurality of spaced arc shapes along the edge of the first well (110).

[0110] The distance between the first electrode (210) and the second electrode (220) spaced apart from the light-emitting element (200) may be greater than the distance between the center of the first well (110) and the second electrode (220). The certain distance at which the first electrode (210) is spaced apart from the bottom edge may be equal to or greater than the minimum distance that prevents the first electrode (210) of the light-emitting element (200) from being connected to the second electrode pad (320) in the first well (110). It may be preferable that the certain distance be the minimum distance. In this way, for a light-emitting element (200) without rotational symmetry, the electrode spacing between the first electrode (210) and the second electrode (220) can be secured, thereby reducing the possibility of defects caused by alignment errors and expanding the light-emitting area.

[0111] In one embodiment according to FIG. 15, the light-emitting element (200) has a trapezoidal shape, but is not limited thereto, and the first electrode (210) may be connected only to the first electrode pad (310), and the second electrode (220) may be connected only to the second electrode pad (320), and any other shape may be possible if the light-emitting element (200) has a rotationally asymmetric planar shape.

[0112] FIGS. 16a to 16c are schematics showing a light-emitting element (200) having various shapes without rotational symmetry other than a trapezoidal shape, and FIGS. 17a to 17d are schematics showing a light-emitting element (200) having shapes without rotational symmetry and line symmetry.

[0113] According to FIGS. 16a to 16c, the light-emitting element (200) of the display transfer structure (10) according to an exemplary embodiment may have a polygon. The polygonal light-emitting element (200) may have a body portion and a protrusion portion. A first electrode (210) may be disposed in the body portion, and a second electrode (220) may be disposed in the protrusion portion. In the case of the light-emitting element (200) of the embodiment of FIGS. 16a to 16c, insertion may be advantageous if the substrate (100) has a circular first well (110). However, it is not limited thereto, and may also be used in cases where the first well (110) includes a first direction and a second direction that partially overlap.

[0114] According to FIGS. 17a to 17d, the light-emitting element (200) of the display transfer structure (10) according to an exemplary embodiment may have a rotational asymmetry and a linear asymmetry planar shape. In the transfer process, if the light-emitting element (200) has a shape without linear symmetry, such as the light-emitting element (200) of the embodiment of FIGS. 17a to 17d, it may be inserted into a first well (110) having the same shape as the light-emitting element (200) without being inverted vertically. Alternatively, it may be inserted into a first well (110) including a first region (111) and a second region (112) having the same shape as the light-emitting element (200) without being inverted, which may be advantageous during the transfer process.

[0115] FIG. 18 is a schematic diagram showing that light-emitting elements of different shapes are inserted into multiple wells (110a, 110b, 110c) of different shapes.

[0116] A plurality of wells (110a, 110b, 110c) may include a third well (110a), a fourth well (110b), and a fifth well (110c) having different shapes. A plurality of wells (110a, 110b, 110c) may include a plurality of regions. The third well (110a), the fourth well (110b), and the fifth well (110c) may each be included in different subpixels. A plurality of light-emitting elements (200a, 200b, 200c) may include a third light-emitting element (200a) disposed in the third well (110a), a fourth light-emitting element (200b) disposed in the fourth well (110b), and a fifth light-emitting element (200c) disposed in the fifth well (110c), each having different shapes. That is, multiple light-emitting elements (200a, 200b, 200c) can be exclusively inserted into multiple wells (110a, 110b, 110c) according to their shape.

[0117] Each different subpixel can emit different colors, and a pixel may include said subpixels. For example, each different subpixel can produce red light (R), green light (G), and blue light (B), respectively. A pixel can produce full color.

[0118] If multiple light-emitting elements have different shapes and are inserted into corresponding wells, red light (R), green light (G), and blue light (B) light-emitting elements (200a, 200b, 200c) can be simultaneously transferred to a substrate (100). Since light-emitting elements (200a, 200b, 200c) emitting different colors of light can be rapidly transferred to a large-area display transfer structure (10), large-area transfer is possible, and this can be applied to a large display device. In addition, the cost of large-area transfer of micro light-emitting elements can be reduced, thereby lowering the unit cost of the display device.

[0119] FIGS. 19(a) and 19(b) are schematics showing a display transfer structure (10) according to an exemplary embodiment.

[0120] According to FIG. 2, FIG. 19(a) and FIG. 19(b), a display transfer structure (10) according to one embodiment comprises a substrate having a plurality of wells (110, 120, 130) and a light-emitting element (200) disposed in the plurality of wells, and the light-emitting element (200) may have a rotationally asymmetric shape. Among the plurality of wells (110, 120, 130), adjacent first well (110) and second well (120) are included in one subpixel (SUB1), and the light-emitting element (200) disposed in the first well (110) is oriented toward the first direction (D1) of the first well (110), and the light-emitting element (200) disposed in the second well (120) may be oriented toward the first direction (D1') of the second well that is different from the first direction (D1) of the first well (110). A method for transferring a light-emitting element according to an exemplary embodiment includes the step (S100) of preparing a substrate (100) having a plurality of wells (110, 120, 130), supplying a plurality of light-emitting elements (200) having a rotationally asymmetric planar shape onto the substrate, and transferring at least one of the plurality of light-emitting elements (200) to one of the plurality of wells (110, 120, 130). An adjacent first well (110) and a second well (120) among the plurality of wells (110, 120, 130) are included in one subpixel (SUB1), and a light-emitting element (200) may be inserted into the first well (110) in a first direction (D1), and a light-emitting element (200) may be inserted into the second well (120) in a first direction (D1') of the second well (120) which is a direction different from the first direction (D1) of the first well (110). Since the light-emitting element (200) has a rotationally asymmetric planar shape, the distance between the first electrode (210) and the second electrode (220) on the light-emitting element (200) can be increased, thereby reducing the possibility of defects caused by alignment errors, and as the area occupied by the first electrode (210) and the second electrode (220) is reduced, the light-emitting area can be expanded.In addition, the transfer efficiency can be increased by allowing light-emitting elements (200) to be inserted in different directions into each of the multiple wells (110, 120, 130) of the substrate (100).

[0121] The first well (110), the second well (120), and the third well (130) of the light-emitting element transfer method according to the exemplary embodiment of FIG. 19(a) and FIG. 19(b) each include a region that does not overlap with each other, and the light-emitting element (200) can be inserted into each region by being oriented toward the first direction (D1) of the first well (110), the first direction (D1') of the second well (120), or the first direction (D'') of the third well (130). The first direction (D1) of the first well (110), the first direction (D1') of the second well (120), and the first direction (D'') of the third well (130) may be different from each other. The first well (110), the second well (120), and the third well (130) according to the exemplary embodiments of FIG. 19(a) and 19(b) may be similar to the embodiment having the first well (110) and the second well (120) according to the exemplary embodiment described in FIG. 1, except that each includes only one region.

[0122] The first well (110), the second well (120), and the third well (130) may be arranged in an arc shape with respect to any central axis perpendicular to the substrate (100). The first electrode pad (310) and the second electrode pad (320) may be arranged in a straight line shape as in FIG. 19(a) or in an arc shape as in FIG. 19(b). If the electrode pads are arranged in an arc shape to match the arrangement of the wells (110, 120, 130), the probability of errors occurring in the connection between the first electrode (210) and the first electrode pad (310) and the connection between the second electrode (220) and the second electrode pad (320) can be reduced. The arc-shaped first electrode pad (310) and the second electrode pad (320) may be extended to form a ring shape. In this case, the first electrode pad (310) may have a ring shape with a smaller radius, as well as various shapes such as a circle, ellipse, or polygon. FIGS. 19(a) and FIGS. 19(b) illustrate the first well (110), the second well (120), and the third well (130), but are not limited thereto and may also be included in a subpixel (SUB1) containing only the first well (110) and the second well (120).

[0123] The display transfer structure (10) described through FIGS. 1 to 19(b) can be applied to a display device.

[0124] FIG. 20 is a block diagram of an electronic device including a display device according to an exemplary embodiment.

[0125] Referring to FIG. 20, an electronic device (5201) may be provided within a network environment (5200). In the network environment (5200), the electronic device (5201) may communicate with another electronic device (5202) through a first network (5298) (short-range wireless communication network, etc.) or with another electronic device (5204) and / or a server (5208) through a second network (5299) (long-range wireless communication network, etc.). The electronic device (5201) may communicate with the electronic device (5204) through the server (5208). The electronic device (5201) may include a processor (5220), memory (5230), input device (5250), sound output device (5255), display device (5260), audio module (5270), sensor module (5276), interface (5277), haptic module (5279), camera module (5280), power management module (5288), battery (5289), communication module (5290), subscriber identification module (5296), and / or antenna module (5297). Some of these components may be omitted from the electronic device (5201), or other components may be added. Some of these components may be implemented as a single integrated circuit. For example, the sensor module (5276) (fingerprint sensor, iris sensor, ambient light sensor, etc.) may be implemented by being embedded in the display device (5260) (display, etc.).

[0126] The processor (5220) can execute software (program (5240), etc.) to control one or more other components (hardware, software components, etc.) of the electronic device (5201) connected to the processor (5220) and can perform various data processing or operations. As part of the data processing or operations, the processor (5220) can load commands and / or data received from other components (sensor module (5276), communication module (5290), etc.) into volatile memory (5232), process the commands and / or data stored in volatile memory (5232), and store the resulting data in non-volatile memory (5234). The processor (5220) may include a main processor (5221) (central processing unit, application processor, etc.) and an auxiliary processor (5223) (graphics processing unit, image signal processor, sensor hub processor, communication processor, etc.) that can operate independently or together with it. The auxiliary processor (5223) uses less power than the main processor (5221) and can perform specialized functions.

[0127] The auxiliary processor (5223) can control the functions and / or states associated with some of the components of the electronic device (5201), such as the display device (5260), sensor module (5276), communication module (5290), etc., on behalf of the main processor (5221) while the main processor (5221) is in an inactive state (sleep state), or together with the main processor (5221) while the main processor (5221) is in an active state (application execution state). The auxiliary processor (5223) (image signal processor, communication processor, etc.) may also be implemented as part of other functionally related components (camera module (5280), communication module (5290), etc.).

[0128] The memory (5230) can store various data required by components of the electronic device (5201), such as a processor (5220), a sensor module (5276), etc. The data may include, for example, input data and / or output data for software (program (5240), etc.) and related commands. The memory (5230) may include volatile memory (5232) and / or non-volatile memory (5234).

[0129] The program (5240) may be stored as software in memory (5230) and may include an operating system (5242), middleware (5244) and / or an application (5246).

[0130] The input device (5250) can receive commands and / or data to be used for components (processor (5220), etc.) of the electronic device (5201) from outside the electronic device (5201) (user, etc.). The input device (5250) may include a remote controller, a microphone, a mouse, a keyboard, and / or a digital pen (stylus pen, etc.).

[0131] The sound output device (5255) can output a sound signal to the outside of the electronic device (5201). The sound output device (5255) may include a speaker and / or a receiver. The speaker may be used for general purposes, such as multimedia playback or recording playback, and the receiver may be used to receive incoming calls. The receiver may be combined as part of the speaker or implemented as a separate, independent device.

[0132] A display device (5260) can visually provide information to the outside of an electronic device (5201). The display device (5260) may include a display, a holographic device, or a projector and a control circuit for controlling said device. The display device (5260) may include a display transfer structure (10) described with reference to FIGS. 1 to 19(b). The display device (5260) may include a touch circuitry configured to detect a touch, and / or a sensor circuitry (such as a pressure sensor) configured to measure the intensity of a force generated by a touch.

[0133] The audio module (5270) can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. The audio module (5270) can acquire sound through an input device (5250) or output sound through a speaker and / or headphones of another electronic device (electronic device (8102), etc.) that is directly or wirelessly connected to an audio output device (5255) and / or an electronic device (5201).

[0134] The sensor module (5276) can detect the operating state (power, temperature, etc.) of the electronic device (5201) or the external environmental state (user state, etc.) and generate an electrical signal and / or data value corresponding to the detected state. The sensor module (5276) may include a gesture sensor, a gyroscope sensor, a barometric pressure sensor, a magnetic sensor, an accelerometer sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biosensor, a temperature sensor, a humidity sensor, and / or an illuminance sensor.

[0135] The interface (5277) may support one or more specified protocols that can be used for the electronic device (5201) to be connected directly or wirelessly to another electronic device (electronic device (8102), etc.). The interface (5277) may include an HDMI (High Definition Multimedia Interface), a USB (Universal Serial Bus) interface, an SD card interface, and / or an audio interface.

[0136] The connection terminal (5278) may include a connector that allows the electronic device (5201) to be physically connected to another electronic device (electronic device (5202), etc.). The connection terminal (5278) may include an HDMI connector, a USB connector, an SD card connector, and / or an audio connector (headphone connector, etc.).

[0137] The haptic module (5279) can convert electrical signals into mechanical stimulation (vibration, movement, etc.) or electrical stimulation that can be perceived by the user through tactile or kinesthetic senses. The haptic module (5279) may include a motor, a piezoelectric element, and / or an electric stimulation device.

[0138] The camera module (5280) can capture still images and video. The camera module (5280) may include a lens assembly including one or more lenses, image sensors, image signal processors, and / or flashes. The lens assembly included in the camera module (5280) can collect light emitted from a subject that is the subject of the image capture.

[0139] The power management module (5288) can manage the power supplied to the electronic device (5201). The power management module (8388) can be implemented as part of a Power Management Integrated Circuit (PMIC).

[0140] The battery (5289) can supply power to the components of the electronic device (5201). The battery (5289) may include a non-rechargeable primary battery, a rechargeable secondary battery and / or a fuel cell.

[0141] The communication module (5290) can support the establishment of a direct (wired) communication channel and / or a wireless communication channel between an electronic device (5201) and another electronic device (electronic device (8102), electronic device (8104), server (8108), etc.), and the performance of communication through the established communication channel. The communication module (5290) may include one or more communication processors that operate independently of the processor (5220) (application processor, etc.) and support direct communication and / or wireless communication. The communication module (5290) may include a wireless communication module (5292) (cellular communication module, short-range wireless communication module, GNSS (Global Navigation Satellite System, etc.) communication module) and / or a wired communication module (5294) (LAN (Local Area Network) communication module, power line communication module, etc.). Among these communication modules, the corresponding communication module can communicate with other electronic devices through a first network (5298) (a short-range communication network such as Bluetooth, WiFi Direct, or IrDA (Infrared Data Association)) or a second network (5299) (a long-range communication network such as a cellular network, the Internet, or a computer network (LAN, WAN, etc.). These various types of communication modules may be integrated into a single component (single chip, etc.) or implemented as multiple separate components (multiple chips). The wireless communication module (5292) can identify and authenticate an electronic device (5201) within a communication network such as the first network (5298) and / or the second network (5299) using subscriber information (such as the International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module (5296).

[0142] The antenna module (5297) can transmit signals and / or power to or from the outside (other electronic devices, etc.). The antenna may include a radiator made of a conductive pattern formed on a substrate (PCB, etc.). The antenna module (5297) may include one or multiple antennas. If multiple antennas are included, the communication module (5290) may select an antenna suitable for a communication method used in a communication network, such as a first network (5298) and / or a second network (5299), from among the multiple antennas. Through the selected antenna, signals and / or power may be transmitted or received between the communication module (5290) and other electronic devices. In addition to the antenna, other components (RFIC, etc.) may be included as part of the antenna module (5297).

[0143] Some of the components can be connected to each other and exchange signals (commands, data, etc.) through communication methods between peripheral devices (bus, GPIO (General Purpose Input and Output), SPI (Serial Peripheral Interface), MIPI (Mobile Industry Processor Interface), etc.).

[0144] Commands or data may be transmitted or received between the electronic device (5201) and an external electronic device (5204) through a server (8108) connected to the second network (5299). The other electronic devices (5202, 5204) may be of the same or different type as the electronic device (5201). All or part of the operations performed on the electronic device (5201) may be performed on one or more of the other electronic devices (5202, 5204, 5208). For example, when the electronic device (5201) needs to perform a function or service, instead of performing the function or service itself, it may request one or more other electronic devices to perform part or all of that function or service. Upon receiving the request, one or more other electronic devices may perform additional functions or services related to the request and transmit the results of the execution to the electronic device (5201). To this end, cloud computing, distributed computing, and / or client-server computing technologies may be used.

[0145] FIG. 21 illustrates an example in which a display device according to an exemplary embodiment is applied to a mobile device. The mobile device (6100) may include a display device (6110) according to an exemplary embodiment. The display device (6110) may include a display transfer structure (10) described with reference to FIGS. 1 to 19(b). The display device (6110) may have a foldable structure and, for example, may be applied to a multi-folder display. Here, the mobile device (6100) is shown as a foldable display, but it may also be applicable to a general flat-panel display.

[0146] FIG. 22 illustrates an example in which a display device according to an exemplary embodiment is applied to a vehicle. The display device may be applied to a head-up display device for a vehicle. The head-up display device (6200) may include a display device (6210) provided in one area of ​​the vehicle and at least one light path changing member (6220) that changes the light path so that an image generated by the display device (6210) can be viewed by the driver.

[0147] FIG. 23 illustrates an example in which a display device according to an exemplary embodiment is applied to augmented reality glasses or virtual reality glasses. Augmented reality glasses (6300) may include a projection system (6310) that forms an image and at least one element (6320) that guides the image from the projection system (6310) into the user's eye. The projection system (6310) may include a display transfer structure (10) described with reference to FIGS. 1 to 19(b).

[0148] FIG. 24 illustrates an example in which a display device according to an exemplary embodiment is applied to a large signage. The signage (6400) can be used for outdoor advertising using a digital information display and can control advertising content, etc. through a communication network. The signage (6400) can be implemented, for example, through an electronic device described with reference to FIG. 20.

[0149] FIG. 25 illustrates an example in which a display device according to an exemplary embodiment is applied to a wearable display. The wearable display (6500) may include a display transfer structure (10) described with reference to FIG. 1 to FIG. 19(b) and may be implemented through an electronic device described with reference to FIG. 20.

[0150] The display device according to the exemplary embodiment can also be applied to various other products, such as rollable TVs and stretchable displays.

[0151] The above-described embodiments are merely exemplary, and various modifications and equivalent alternative embodiments are possible therefrom for those skilled in the art. Accordingly, the true scope of technical protection according to the exemplary embodiments must be determined by the technical concept of the invention as described in the following claims. Explanation of the symbols

[0152] 10: Display transfer structure 100: Substrate 110: Well 1 111: Area 1 of Well 1 112: Area 2 of Well 1 120: Well 2 121: Area 1 of the 2nd well 122: Area 2 of the 2nd well 200: Light-emitting element 210: First electrode 220: Second electrode 310: First electrode pad 320: Second electrode pad CA: Central axis TCL: Taper centerline of the light-emitting element D1: First direction D2: Second direction SUB1: Subpixel

Claims

Claim 1 A display transfer structure comprising: a substrate including a plurality of wells; and a plurality of light-emitting elements disposed in the plurality of wells; wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, the first well among the plurality of wells includes a first region and a second region that partially overlap each other, and the first light-emitting element among the plurality of light-emitting elements is optionally disposed in the first region or the second region. Claim 2 delete Claim 3 In claim 1, the first region and the second region are a display transfer structure having a planar shape corresponding to the planar shape of the first light-emitting element. Claim 4 A display transfer structure according to claim 1, wherein the first region of the first well is oriented in a first direction, the second region of the first well is oriented in a second direction, and the first light-emitting element is oriented in the direction of the first region or the second region in which the first light-emitting element is placed. Claim 5 A display transfer structure according to claim 1, wherein the first well further includes a third region that partially overlaps with the second region, the first light-emitting element is disposed in the first region, and among the plurality of light-emitting elements, the second light-emitting element is disposed in the third region. Claim 6 A display transfer structure according to claim 1, wherein at least one of the plurality of light-emitting elements comprises a spaced-apart first electrode and a second electrode, and a plurality of first electrode pads and second electrode pads are spaced-apart and disposed on the substrate, wherein one of the plurality of first electrode pads is electrically connected to the first electrode and one of the plurality of second electrode pads is electrically connected to the second electrode. Claim 7 In claim 1, the adjacent first well and second well among the plurality of wells are a display transfer structure included in one subpixel. Claim 8 A display transfer structure comprising: a substrate including a plurality of wells; and a plurality of light-emitting elements disposed in the plurality of wells; wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, adjacent first wells and second wells among the plurality of wells are included in a single subpixel, the first wells and second wells are rotationally symmetric with respect to a predetermined central axis perpendicular to the substrate, and first and second electrode pads disposed in the first well are rotationally symmetric with respect to the predetermined central axis with respect to first and second electrode pads disposed in the second well. Claim 9 In claim 8, the first and second wells are arranged in an arc shape with respect to a predetermined central axis perpendicular to the substrate, and the first and second electrode pads of the substrate have an arc or ring shape with respect to the predetermined central axis, forming a display transfer structure. Claim 10 A display transfer structure comprising: a substrate including a plurality of wells; and a plurality of light-emitting elements disposed in the plurality of wells; wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, and the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, and among the plurality of wells, a first well includes a first region and a second region that partially overlap each other, and the second region is a region obtained by rotating the first region counterclockwise by a first angle with respect to a specific rotation point, and among the plurality of light-emitting elements, a first light-emitting element is disposed on the region where the first region and the second region overlap. Claim 11 A display transfer structure according to claim 10, wherein the first region is oriented in a first direction, the second region is oriented in a second direction in which the first direction is rotated by the first angle, the first light-emitting element is oriented and arranged in a direction rotated by the second angle from the first direction, and the second angle is one angle within 0 degrees to the first angle. Claim 12 A display transfer structure comprising: a substrate including a plurality of wells; and a plurality of light-emitting elements disposed in the plurality of wells; wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, and the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, wherein a first well among the plurality of wells includes a first region and a second region that partially overlap each other, and the second region is a region obtained by translating the first region by a first distance with respect to a specific direction, and the first light-emitting element among the plurality of light-emitting elements is disposed on the region where the first region and the second region overlap, and the first region and the second region are oriented in a first direction, and the first light-emitting element is disposed oriented in the first direction. Claim 13 A display transfer structure comprising: a substrate including a plurality of wells; and a plurality of light-emitting elements disposed in the plurality of wells; wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, the plurality of light-emitting elements include a first light-emitting element having a tapered planar shape, the plurality of wells include a first well having a tapered planar shape that is equal to or greater than the degree of tapering of the first light-emitting element, and a smaller face and a larger face among the faces intersecting the tapered centerline of the first light-emitting element are respectively disposed facing the smaller face and the larger face among the faces intersecting the tapered centerline of the first well. Claim 14 A display transfer structure comprising: a substrate including a plurality of wells; and a plurality of light-emitting elements disposed in the plurality of wells; wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, a first well among the plurality of wells has a circular planar shape, the first light-emitting element among the plurality of light-emitting elements is disposed in the first well, the diameter of the circle is greater than the maximum length of the first light-emitting element, and the distance between a first electrode and a second electrode included in the first light-emitting element is greater than the distance between the center of the first well and the second electrode. Claim 15 In claim 1, the plane of at least one of the plurality of light-emitting elements has a trapezoidal shape, a truncated fan shape, or a polygonal shape, in a display transfer structure. Claim 16 A display transfer structure according to claim 1, wherein the planar shape of at least one of the plurality of light-emitting elements is a trapezoidal shape or a truncated fan shape, and a first electrode and a second electrode are disposed in different regions of the at least one light-emitting element based on the tapered centerline of the at least one light-emitting element. Claim 17 A display transfer structure according to claim 1, wherein the planar shape of at least one of the plurality of light-emitting elements has a linearly asymmetric shape. Claim 18 A display transfer structure according to claim 1, wherein the plurality of wells include a third well and a fourth well having different shapes, and the plurality of light-emitting elements include a third light-emitting element exclusively disposed in the third well and a fourth light-emitting element having a different shape from the third light-emitting element and exclusively disposed in the fourth well. Claim 19 A display transfer structure comprising: a substrate including a plurality of wells; and a plurality of light-emitting elements disposed in the plurality of wells; wherein the plurality of light-emitting elements have a rotationally asymmetric planar shape, adjacent first wells and second wells among the plurality of wells are included in one subpixel, and the first wells and the second wells each include a first region and a second region that partially overlap each other, wherein the light-emitting element disposed in the first region is oriented in a first direction, and the light-emitting element disposed in the second region is oriented in a second direction different from the first direction. Claim 20 A method for transferring light-emitting elements, comprising: a step of preparing a substrate including a plurality of wells; and a step of transferring a plurality of light-emitting elements having a rotationally asymmetric planar shape to a plurality of wells; wherein the plurality of wells have a planar shape different from the planar shape of the plurality of light-emitting elements, and among the plurality of wells, a first well includes a first region and a second region that partially overlap each other, and the transfer step includes a step in which a first light-emitting element among the plurality of light-emitting elements is selectively inserted in a first direction into the first region or inserted in a second direction into the second region.

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