Display device using semiconductor light emitting diode

Abstract

A display device may be applied to display-related technical fields, and a display device using a micro light emitting diode (LED) is disclosed. A display device using a light emitting diode includes: a wiring substrate in which a plurality of unit pixels are defined; at least one electrode pad disposed in each of the unit pixels to define a plurality of unit sub-pixels; and at least one light emitting diode configured to have an inclination angle and a bonding surface, a side surface of the light emitting diode being inclined to one side at the inclination angle, and the bonding surface being electrically connected to the electrode pad. Two light emitting diodes adjacent to each other are symmetrically arranged with respect to the inclination angle, and a distance between two electrode pads adjacent to each other varies according to a position of the electrode pads.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of Korean Patent Application No. 10-2023-0101829, filed on August 3, 2023, which is hereby incorporated by reference as if fully set forth herein. Technical Field

[0002] The present disclosure is applicable to a technical field related to a display device, and relates to, for example, a display device using a micro light emitting diode (LED). Background Art

[0003] Recently, display devices having excellent characteristics such as being thin and flexible are being developed in the field of display technology. Currently, commercially available main displays are represented by liquid crystal displays (LCDs) and organic light emitting diodes (OLEDs).

[0004] In one example, light emitting diodes (LEDs), as well-known semiconductor light emitting devices that convert electric current into light, have been used as light sources for images displayed in electronic devices including information and communication devices, and GaP:N-based green LEDs, since the commercialization of red LEDs using GaAsP compound semiconductors in 1962.

[0005] Recently, such light emitting diodes (LEDs) have been gradually miniaturized and manufactured as micrometer-sized LEDs for use in pixel or plane lighting of display devices.

[0006] Sapphire, which is a substrate on which a gallium nitride-based semiconductor is grown, has an inclined crystal surface. For example, the R-plane has a crystal surface inclined along the m-axis. Ordinary sapphire may have the R-plane as a growth plane. Since the R-plane has a surface inclined relative to the hexagonal column crystal shape, the sapphire substrate and the gallium nitride-based semiconductor grown on the crystal surface of the sapphire substrate may have such an inclined angle.

[0007] Furthermore, such an inclination angle may also be formed when a light emitting diode is formed as a gallium nitride-based semiconductor on a sapphire substrate and then cut in the direction of the crystal surface of the sapphire substrate.

[0008] Therefore, when the light emitting diode is mounted on the wiring substrate in a general arrangement and emits light, a single sub-pixel can be constructed relative to one light emitting diode in a state with an asymmetric light distribution relative to the direction connecting the two electrode pads, and the single sub-pixel can constitute a display device.

[0009] As such, when a display device is formed using a single sub-pixel having an asymmetric light distribution, a problem may arise in that when the display device is viewed from the outside, the color of the display appears different depending on the viewing direction.

[0010] Furthermore, undesirable parasitic capacitance may occur due to an electric field formed by a polarity difference between the signal electrode / common electrode of the light emitting diode.

[0011] Therefore, even when the electric field dissipates, the discharge of the parasitic capacitance may not be normally performed, and thus a situation in which an adjacent light emitting diode is unintentionally turned on may occur.

[0012] The corresponding effects may be accumulated by the total number of light emitting diodes used in the display device, and eventually, a ghost phenomenon may appear in the unit of the display product.

[0013] Therefore, a method that can solve this problem is needed. Summary of the invention

[0014] Accordingly, embodiments of the present disclosure are directed to a display device using a semiconductor light emitting diode (LED) that substantially obviates one or more problems due to limitations and disadvantages of the related art.

[0015] An object of the present disclosure is to provide a display device using semiconductor light emitting diodes (LEDs) capable of canceling out biased light distribution of each light emitting diode (LED) affected by the crystallinity of such LEDs.

[0016] Another object of the present disclosure is to provide a display device using a semiconductor LED, which can solve a problem in which colors appear different depending on a viewing direction when the display device is viewed from the outside.

[0017] Another object of the present disclosure is to provide a display device using semiconductor LEDs, which can reduce parasitic capacitance caused by a difference in electrical polarity between LEDs.

[0018] Another object of the present invention is to provide a display device using semiconductor LEDs, which can cancel out an electric field caused by a difference in electrical polarity between LEDs.

[0019] Another object of the present disclosure is to provide a display device using a semiconductor LED, which can correct the color difference between the left and right sides of a display by visually enhancing some areas with weak colors when the display is viewed from one direction.

[0020] Another object of the present disclosure is to provide a display device using a semiconductor LED, which can correct the color difference between the left and right sides of a display by visually strengthening some areas with weak colors when the display is viewed from one direction. Therefore, the present invention provides a display device using a semiconductor LED, which can obtain the effect of improving the color viewing angle in the final product stage of the display device.

[0021] Another object of the present disclosure is to provide a display device using semiconductor LEDs, which can prevent brightness differences caused by light distribution characteristics from occurring because the distance (pitch) between center points of the LEDs is constant when the display device is viewed from the side.

[0022] Another object of the present invention is to provide a display device using a semiconductor LED, which can effectively eliminate various phenomena that may appear due to the tilt angle or tilted light distribution pattern of the light emitting diode (LED), such as the phenomenon in which dark areas of the display are visible, the phenomenon in which vertical lines of the display are visible, the uneven light phenomenon, etc.

[0023] The technical tasks that can be obtained from the present disclosure are not limited to the above technical tasks. Moreover, ordinary technicians in the technical field to which the present disclosure belongs can clearly understand other technical tasks not mentioned from the following description.

[0024] Additional advantages, objects and features of the present disclosure will be described in the disclosure and drawings herein. Those skilled in the art can also understand these aspects based on the disclosure herein.

[0025] To achieve these objectives and other advantages and in accordance with the purposes of the present disclosure, as specifically implemented and broadly described herein, a display device using light-emitting diodes may include: a wiring substrate, in which a plurality of unit pixels are defined; at least one electrode pad, disposed in each of the unit pixels to define a plurality of unit sub-pixels; and at least one light-emitting diode, configured to have a tilt angle and a bonding surface, a side surface of the light-emitting diode tilted to one side at the tilt angle, the bonding surface being electrically connected to the electrode pad, wherein two light-emitting diodes adjacent to each other are arranged symmetrically with respect to the tilt angle, and a distance between two electrode pads adjacent to each other varies according to the positions of the electrode pads.

[0026] In an exemplary embodiment, electrode polarities of light emitting diodes connected to two adjacent electrode pads may be arranged such that the same polarities face each other.

[0027] In an exemplary embodiment, the distance between the two adjacent electrode pads may be varied by a shift of a light emitting surface of the light emitting diode caused by a tilt angle.

[0028] In an exemplary embodiment, the distance between the two adjacent electrode pads may be changed by compensating for a shift of a light emitting surface of a light emitting diode caused by a tilt angle.

[0029] In an exemplary embodiment, the distance between the two adjacent electrode pads may vary in an arrangement direction of light emitting diodes emitting light of the same color.

[0030] In an exemplary embodiment, the distance between the two adjacent electrode pads may include a first distance and a second distance that are different from each other.

[0031] In an exemplary embodiment, the first distance and the second distance may be repeatedly arranged.

[0032] In an exemplary embodiment, polarities of the face-to-face light emitting diodes corresponding to the two adjacent electrode pads may be the same.

[0033] In an exemplary embodiment, the distance between the two adjacent electrode pads may include: a first distance corresponding to an inclination angle at which light emitting surfaces of the light emitting diodes move closer to each other; and a second distance corresponding to an inclination angle at which light emitting surfaces of the light emitting diodes move away from each other.

[0034] In an exemplary embodiment, the second distance may be smaller than the first distance.

[0035] In an exemplary embodiment, the light emitting surface may be a top surface of a light emitting diode.

[0036] In an exemplary embodiment, distances between light emitting surfaces of the light emitting diodes corresponding to the first distance and the second distance may be equal to each other.

[0037] In an exemplary embodiment, distances between bonding surfaces of the light emitting diodes corresponding to the first distance and the second distance may be different from each other.

[0038] In exemplary embodiments, the tilt angle of the light emitting diode may be caused by crystallinity of a semiconductor material of the light emitting diode.

[0039] In an exemplary embodiment, the light emitting diode may have a side cross section or a side surface in a longitudinal direction, that is, the side cross section or the side surface may be formed in a parallelogram shape.

[0040] According to another aspect of the present disclosure, a display device using a light-emitting diode may include: a wiring substrate in which a plurality of unit pixels are defined; at least one electrode pad is disposed in each of the unit pixels to define a plurality of unit sub-pixels; and at least one light-emitting diode is configured to have an inclination angle and a bonding surface, a side surface of the light-emitting diode is inclined to one side at the inclination angle, and the bonding surface is electrically connected to the electrode pad. The light-emitting diode includes a first light-emitting diode configured to emit light of a first color in a first direction. The first light-emitting diode includes a 1-1 light-emitting diode, a 1-2 light-emitting diode, and a 1-3 light-emitting diode arranged in series; and a first distance between the 1-1 light-emitting diode and the 1-2 light-emitting diode is different from a second distance between the 1-2 light-emitting diode and the 1-3 light-emitting diode.

[0041] In an exemplary embodiment, the first distance is a distance between centers of bonding surfaces of the 1-1th LED and the 1-2th LED; and the second distance is a distance between centers of bonding surfaces of the 1-2th LED and the 1-3th LED.

[0042] In an exemplary embodiment, the display device may further include: a second light emitting diode configured to emit light of a second color in a second direction; and a third light emitting diode configured to emit light of a third color in a third direction. Among the first light emitting diode, the second light emitting diode, and the third light emitting diode, adjacent first light emitting diodes, second light emitting diodes, and third light emitting diodes form a unit pixel; and the direction of the tilt angle of each of the second light emitting diodes is different from at least one of the tilt angle of each of the first light emitting diodes and the tilt angle of each of the third light emitting diodes.

[0043] In an exemplary embodiment, in a unit pixel, offsets of light emitting surfaces of light emitting diodes may be equal to each other.

[0044] In an exemplary embodiment, the 1-1th light emitting diode and the 1-2th light emitting diode may be symmetrically arranged with respect to the tilt angle such that polarities of electrodes in directions facing each other are the same.

[0045] According to another aspect of the present disclosure, a display device using light-emitting diodes may include: a wiring substrate in which a plurality of unit pixels are defined; at least one electrode pad arranged in each of the unit pixels to define a plurality of unit sub-pixels; and at least one light-emitting diode configured to have an inclination angle and a bonding surface, a side surface of the light-emitting diode being inclined toward one side at the inclination angle, the bonding surface being electrically connected to the electrode pad, wherein light-emitting diodes adjacent to each other in a first direction are arranged symmetrically with respect to the inclination angle so that the electrode polarities of the light-emitting diodes facing each other are the same, and a first light-emitting diode emitting light of a first color is arranged in the first direction; and a sub-pixel spacing defined by the distance between the electrode pads varies according to the direction of the inclination angle.

[0046] In exemplary embodiments, the sub-pixel pitch may include a first sub-pixel pitch and a second sub-pixel pitch.

[0047] In exemplary embodiments, the first sub-pixel pitch and the second sub-pixel pitch may be alternately positioned in the first direction.

[0048] In an exemplary embodiment, the sub-pixel pitch may include: a first sub-pixel pitch corresponding to an inclination angle at which light emitting surfaces of the light emitting diodes move closer to each other; and a second sub-pixel pitch corresponding to an inclination angle at which light emitting surfaces of the light emitting diodes move away from each other.

[0049] In an exemplary embodiment, the second sub-pixel pitch may be smaller than the first sub-pixel pitch.

[0050] In an exemplary embodiment, distances between bonding surfaces of light emitting diodes corresponding to the first sub-pixel pitch and the second sub-pixel pitch may be different from each other.

[0051] According to one embodiment of the present invention, the following effects are obtained.

[0052] The display device using semiconductor light emitting diodes (LEDs) according to the embodiment of the present disclosure can offset the biased light distribution of each light emitting diode (LED) affected by the crystallinity of such LEDs. In other words, the asymmetric light distribution of the LEDs can be offset.

[0053] The display device using the semiconductor LED according to the embodiment of the present disclosure can solve the problem that colors appear different depending on the viewing direction when the display device is viewed from the outside.

[0054] A display device using semiconductor LEDs according to an embodiment of the present disclosure can reduce parasitic capacitance caused by a difference in electrical polarity between LEDs.

[0055] The display device using the semiconductor LED according to the embodiment of the present disclosure can solve the ghost phenomenon that may occur due to such parasitic capacitance.

[0056] The display device using semiconductor LEDs according to an embodiment of the present disclosure can cancel out an electric field caused by a difference in electrical polarity between LEDs.

[0057] The display device using semiconductor LEDs according to the embodiment of the present disclosure can correct the color difference between the left and right sides of the display by visually strengthening some areas with weak colors when viewing the display from one direction. Therefore, the color viewing angle can be improved in the final product stage of the display device.

[0058] The display device using semiconductor LEDs according to the embodiment of the present disclosure can prevent brightness differences caused by light distribution characteristics from occurring because the distance (pitch) between the center points of the LEDs is constant when the display device is viewed from the side.

[0059] A display device using a semiconductor LED according to an embodiment of the present disclosure can effectively eliminate various phenomena that may occur due to the tilt angle or tilted light distribution pattern of the light emitting diode (LED), such as a phenomenon in which dark areas of the display are visible, a phenomenon in which vertical lines of the display are visible, an uneven light phenomenon, etc.

[0060] In addition, according to another embodiment of the present disclosure, no additional technical effects are mentioned herein. Those skilled in the art can understand this through the full meaning of this article and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings may be included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The accompanying drawings illustrate one or more embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure.

[0062] Figure 1 is a schematic diagram showing a display device using a semiconductor light emitting diode (LED) according to an embodiment of the present disclosure.

[0063] Figure 2 is a schematic diagram showing an example of sub-pixel arrangement of a display device using a semiconductor light emitting diode (LED) according to an embodiment of the present disclosure.

[0064] Figure 3 is a schematic diagram showing another example of sub-pixel arrangement of a display device using semiconductor LEDs according to an embodiment of the present disclosure.

[0065] Figure 4 It is shown Figure 2 and Figure 4Schematic diagram of the sub-pixel arrangement.

[0066] Figure 5 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs according to an embodiment of the present disclosure.

[0067] Figure 6 is a schematic diagram showing the effect of sub-pixel arrangement of a display device using semiconductor LEDs according to an embodiment of the present disclosure.

[0068] Figure 7 It is shown that the formation Figure 2 Schematic diagram of the sub-pixel arrangement process shown.

[0069] Figure 8 is a side photographic image showing each light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure.

[0070] Fig. 9 is a schematic diagram illustrating a tilt angle of each light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure.

[0071] Fig.10 is a view schematically showing a sapphire crystal plane and a sapphire crystal direction.

[0072] Fig.11 is a view showing a side photograph image of a light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure.

[0073] Fig.12 2 is a schematic diagram showing a tilt angle of a light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure.

[0074] Fig.13 is a view showing a side photograph image of a light emitting diode (LED) of a display device using a semiconductor LED according to another embodiment of the present disclosure.

[0075] Fig.14 is a schematic diagram showing an example of sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle.

[0076] Fig.15 : is a schematic diagram showing an example of a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to the first embodiment of the present disclosure.

[0077] Figures 16 to 18 is a schematic diagram showing an example of arrangement of light emitting diodes (LEDs) each having an inclined angle.

[0078] Fig.19 is a conceptual diagram showing a light emission pattern of a light emitting diode (LED) having an inclined angle.

[0079] Fig. 20 It is a schematic diagram showing the Fig.14 A view of an arrangement showing the light distribution of the device.

[0080] Fig.21 It shows that according to Fig.14 A view of the arrangement showing the actual luminescence microscopic analysis of the device.

[0081] Fig. 22 It is shown that according to Fig.14 A schematic diagram of the arrangement of the display device and a view of the light distribution viewed from the front.

[0082] Fig.23 It is shown that according to Fig.14 A view of the light distribution of the display device as viewed from the side and a schematic diagram thereof.

[0083] Fig.24 It shows that according to Fig.15 A view of an arrangement showing the light distribution of the device.

[0084] Fig.25 It is shown that according to Fig.15 A schematic diagram of the arrangement of the display device and a view of the light distribution viewed from the front.

[0085] Fig.26 It is shown that according to Fig.15 A view of the light distribution of the display device as viewed from the side and a schematic diagram thereof.

[0086] Fig. 27 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a second embodiment of the present disclosure.

[0087] Fig.28 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a third embodiment of the present disclosure.

[0088] Fig.29 4 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a fourth embodiment of the present disclosure.

[0089] Fig.30 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a fifth embodiment of the present disclosure.

[0090] Fig.31is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a sixth embodiment of the present disclosure.

[0091] Fig.32 2 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a seventh embodiment of the present disclosure. DETAILED DESCRIPTION

[0092] Reference will now be made in detail to embodiments of the present disclosure, examples of which are shown in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the accompanying drawings to refer to the same or similar parts, and redundant descriptions thereof will be omitted. As used herein, the suffixes "module" and "unit" are added or used interchangeably to facilitate the preparation of this specification, and are not intended to imply different meanings or functions. When describing the embodiments disclosed in this specification, the relevant known technologies may not be described in detail so as not to obscure the subject matter of the embodiments disclosed in this specification. In addition, it should be noted that the drawings are only for the purpose of facilitating the understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical spirit disclosed in this specification.

[0093] Furthermore, although the drawings are described individually for simplicity, embodiments implemented by combining at least two or more drawings are also within the scope of the present disclosure.

[0094] Further, when an element such as a layer, region or module is described as being “on” another element, it should be understood that the element can be directly on the other element or intervening elements may be present therebetween.

[0095] The display device described herein is a concept including all display devices that display information using a unit pixel or a group of unit pixels. Therefore, the display device can be applied not only to finished products, but also to components. For example, a panel corresponding to a part of a digital TV also independently corresponds to the display device in this specification. Finished products include mobile phones, smart phones, laptop computers, digital broadcast terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, tablet computers, ultrabooks, digital TVs, desktop computers, etc.

[0096] However, it is apparent to those skilled in the art that the configuration according to the embodiments described herein may be applied even to new products to be developed as display devices later.

[0097] In addition, the semiconductor light emitting diode mentioned in this specification is a concept including LED, micro LED, etc., and can be used interchangeably therewith.

[0098] Figure 1is a schematic diagram of a display device using a semiconductor light emitting diode according to an embodiment of the present disclosure.

[0099] Reference Figure 1 In the display device 10 , a separate unit pixel region 101 may be divided on the wiring substrate 100 , and a plurality of light emitting diodes 200 : 210 , 220 , and 230 , may be mounted in such a unit pixel region 101 .

[0100] In this regard, the individual light emitting diodes 210, 220, and 230 installed in the unit pixel region 101 may substantially correspond to sub-pixels, respectively. For example, three sub-pixels may be aggregated to constitute one pixel. Figure 1 In FIG. 5 , the three light emitting diodes 210 , 220 , and 230 may correspond to red, green, and blue light emitting diodes, respectively.

[0101] Each of the light emitting diodes 210, 220, and 230 may be electrically connected to a pair of electrode pads 130 and 140 / 131 and 141 / 132 and 142. In this case, as an example, the arrangement Figure 1 The electrode pads 130 , 131 , and 132 (hereinafter, referred to as first electrode pads) on one side of the substrate may be connected to first wiring electrodes (signal electrodes or data electrodes) 121 , 122 , and 123 , respectively.

[0102] In addition, the electrode pads 140, 141, and 142 (hereinafter, referred to as second electrode pads) arranged on the other side may be connected to the second wiring electrode (common electrode or scan electrode) 124. However, the opposite is also possible. Figure 1 In FIG. 1 , due to the arrangement of electrodes and pads, the signal electrodes 121 , 122 , and 123 and the common electrode 124 are omitted.

[0103] In one example, in some cases, the first electrode pads 130 , 131 , and 132 may correspond to the signal electrodes 121 , 122 , and 123 , respectively, and the second electrode pads 140 , 141 , and 142 may correspond to the common electrode 124 .

[0104] Hereinafter, the reference numerals of the electrode pad and the wiring electrode may be used interchangeably for description. That is, the same reference numeral may be used to describe the electrode pad and the wiring electrode.

[0105] In this way, a unit sub-pixel may be defined at a point where the first wiring electrodes 121 , 122 , and 123 and the second wiring electrode 124 cross each other.

[0106] In one example, when the first wiring electrodes 121, 122, and 123 are signal electrodes (or data electrodes), such first wiring electrodes 121, 122, and 123 or first electrode pads 130, 131, and 132 may be connected to a thin film transistor (TFT) layer 120 on which a TFT is disposed. Therefore, each of the light emitting diodes 210, 220, and 230 may be driven by switching the drive generated by such a TFT layer 120.

[0107] exist Figure 1 , the TFT layer 120 is briefly shown as a single layer, but the TFT layer 120 may include a plurality of TFT regions capable of performing a switching operation. For example, each TFT region may include a gate electrode, a source electrode, a drain electrode, an insulating layer disposed therebetween, a via electrode (viaelectrode) that may be connected to the first wiring electrodes 121, 122, and 123 or the first electrode pads 130, 131, and 132, etc. A detailed description of this is omitted. Each such TFT region may be connected to each of the light emitting diodes 210, 220, and 230.

[0108] The plurality of light emitting diodes 200: 210, 220, and 230 may be mounted to be electrically connected to the wiring electrodes 121, 122, 123, and 124 to form individual sub-pixels.

[0109] As described above, such a light emitting diode 200 may include a red light emitting diode 210, a green light emitting diode 220, and a blue light emitting diode 230, and these three light emitting diodes 210, 220, and 230 may form a separate sub-pixel and may be repeatedly positioned on the wiring substrate 100. Such light emitting diodes 210, 220, and 230 may include at least one of an organic light emitting diode and an inorganic light emitting diode. For example, the light emitting diodes 210, 220, and 230 may be inorganic semiconductor light emitting diodes (light emitting diodes, LEDs).

[0110] Such a semiconductor light emitting diode (LED) 200 may have a size in the unit of micrometers (μm). The size in micrometers (μm) may mean that the width of at least one surface of the light emitting diode 200 has a size of several micrometers to several hundred micrometers (μm).

[0111] The TFT layer 120 may be positioned on the substrate 110, and the insulating layer 150 may be coated on the TFT layer 120. Such insulating layer 150 may be coated on connection portions between the wiring electrodes 121, 122, 123, and 124, the electrode pads 130, 131, 132 / 140, 141, and 142, and the light emitting diodes 210, 220, and 230.

[0112] For example, the individual light emitting diodes 210, 220, and 230 may be separated from each other by the partition wall 160. In addition, the cover layer 170 may be positioned on the light emitting diodes 210, 220, and 230 and the partition wall 160.

[0113] As described above, the light emitting diodes 210, 220, and 230 may form individual sub-pixels and may be repeatedly positioned on the wiring substrate 100. For example, each pixel region 101 may be repeatedly disposed on the wiring substrate 100.

[0114] In this regard, the pixel regions 101 may be repeatedly positioned along a line of data electrodes (first wiring electrodes) 121, 122, and 123 or a line of scan electrodes (second wiring electrodes) 124 in the longitudinal direction. Figure 1 In the embodiment, the red light emitting diode 210, the green light emitting diode 220 and the blue light emitting diode 230 may be repeatedly positioned along the left-right direction. For example, the red light emitting diode of the adjacent pixel area may be positioned on the right side of the blue light emitting diode 230.

[0115] In one example, another data electrode (first wiring electrode) line or scanning electrode (second wiring electrode) line adjacent to one data electrode (first wiring electrode) line or scanning electrode (second wiring electrode) line in a parallel manner may be positioned (see Figure 8 ). In this regard, the pixel region 102 having the same arrangement of light emitting diodes 210, 220, and 230 as the pixel region 101 (see Figure 8 ) can be located on adjacent data electrode (first wiring electrode) lines or scan electrode (second wiring electrode) lines.

[0116] In this case, light emitting diodes having the same color may be positioned adjacent to each other in adjacent pixel regions. For example, red light emitting diode 210, green light emitting diode 220, and blue light emitting diode 230 may be repeatedly positioned along a data electrode (first wiring electrode) line or a scanning electrode (second wiring electrode) line, but light emitting diodes having the same color may be repeatedly positioned in a direction perpendicular to such a data electrode (first wiring electrode) line or a scanning electrode (second wiring electrode) line.

[0117] In this regard, according to one embodiment of the present disclosure, two adjacent light emitting diodes may have different arrangements. Figure 1 , the red light emitting diode 210 and the green light emitting diode 220 adjacent to the red light emitting diode 210 may have different arrangements.

[0118] For example, in the red light emitting diode 210, the first type electrode (e.g., N-type electrode) may be positioned on the first wiring electrode 130, and in the green light emitting diode 220, the second type electrode (e.g., P-type electrode) may be positioned on the first wiring electrode 131. This different arrangement may also be performed on the green light emitting diode 220 and the blue light emitting diode 230.

[0119] That is, the red light emitting diode 210 and the green light emitting diode 220 adjacent to such red light emitting diode 210 may have a symmetrical arrangement with respect to electrode positions of the respective light emitting diodes 210 and 220 .

[0120] In one example, a light emitting diode (eg, red light emitting diode 210 ) located in one pixel region 101 and a light emitting diode (eg, red light emitting diode 210 ) located in an adjacent pixel region 102 may have a symmetrical arrangement with respect to electrode positions as described above.

[0121] In other words, on the wiring substrate 100, a first light-emitting diode 210 located in a first pixel area 101 and installed in a first arrangement, and a second light-emitting diode 210 located in a second pixel area 102 adjacent to such first pixel area 101 and installed in a second arrangement symmetrical with respect to the first arrangement, can be positioned.

[0122] With the first and second arrangements of the light emitting diodes 210 as described above, parasitic capacitance generated by the difference in electrical polarity between the first light emitting diode and the second light emitting diode may be reduced.

[0123] Furthermore, with the first and second arrangements of the light emitting diodes 210 as described above, an electric field generated by the difference in electrical polarity between the first light emitting diode and the second light emitting diode may be canceled.

[0124] The light emitting diodes (LEDs) 210 having these different arrangements and their effects will be described in detail later.

[0125] Figure 2 is a schematic diagram showing an example of sub-pixel arrangement of a display device using a semiconductor light emitting diode (LED) according to an embodiment of the present disclosure.

[0126] Reference Figure 2 , the light emitting diodes (230a, 230b, 230c, 230d) may be symmetrically arranged on the wiring substrate 100. This arrangement may correspond to a state where the light emitting diodes (LEDs) are arranged in parallel in one direction.

[0127] As described above, the light emitting diodes (230a, 230b, 230c, 230d) may have asymmetric light distribution (a, b; see Figure 2 ). In addition, each of the light emitting diodes (230a, 230b, 230c, 230d) may have an asymmetric light distribution with respect to a direction along which the first electrode pad 132 and the second electrode pad 142 are connected to each other.

[0128] For example, each of the first LED 230a and the third LED 230c may have a light distribution (a) biased to the left. This biasing structure may correspond to the first arrangement. In addition, the second LED 230b located between the first LED 230a and the third LED 230c and the fourth LED 230d located on the right side of the third LED 230c may have a light distribution (b) biased to the right. This biasing structure may correspond to the second arrangement.

[0129] This structure may be a result of material characteristics of at least one of the substrate 231 and the semiconductor layer 232. For example, the above phenomenon may occur because a crystal structure of at least one of the substrate 231 and the semiconductor layer 232 has an inclined shape.

[0130] Figure 2 A state in which each of the LEDs (230a, 230b, 230c, 230d) has a tilted crystal structure is shown. In particular, considering an area (hereinafter, a first area) 230 where two adjacent pixels are paired, a first LED 230a of one pixel and a second LED 230b of another pixel may have tilt angles symmetrical to each other. For example, the first LED 230a and the second LED 230b may be tilted in a direction away from each other. In addition, even in a second area 231 adjacent to the first area 230, a fourth LED 230d and a third LED 230c of another pixel may have tilt angles symmetrical to each other.

[0131] Figure 3 is a schematic diagram showing another example of sub-pixel arrangement of a display device using semiconductor LEDs according to an embodiment of the present disclosure.

[0132] Reference Figure 3 , the light emitting diodes (230e, 230f, 230g, 230h) are symmetrically mounted on the wiring substrate 100. This may correspond to Figure 6 The light emitting diodes (LEDs) shown in FIG. 1 are arranged in parallel.

[0133] As described above, the light emitting diodes (230e, 230f, 230g, 230h) may have an asymmetric light distribution (a, b) with respect to the direction in which the first type electrode 235 and the second type electrode 237 are connected to each other. In addition, each LED (230e, 230f, 230g, 230h) may have an asymmetric light distribution (a, b; see Figure 5 and Figure 6 ).

[0134] Figure 3 A state in which each of the LEDs (230e, 230f, 230g, 230h) has a tilted crystal structure is shown. In particular, considering the region (hereinafter, the third region) 232 where two adjacent pixels are paired, the fifth LED 230e of one pixel and the sixth LED 230f of another pixel may have tilt angles symmetrical to each other. For example, the fifth LED 230e and the sixth LED 230f may be tilted toward a direction in which they are close to each other. In addition, even in the fourth region 233 adjacent to the third region 232, the eighth LED 230h and the seventh LED 230g of another pixel may have tilt angles symmetrical to each other.

[0135] Figure 4 It is schematically shown Figure 2 and Figure 3 Illustration of the sub-pixel arrangement.

[0136] Figure 4 (a) schematically shows the Figure 2 In the first region 230 of the invention, the first LED 230a and the second LED 230b (indicated by "pair") are arranged in a state with an inclined angle in a direction away from each other. That is, the distance between the first LED 230a and the second LED 230b may gradually increase in a direction from the bottom surface to the top surface of the first LED 230a and the second LED 230b.

[0137] also, Figure 4 (b) schematically shows Fig.10 The fifth LED 230e and the sixth LED 230f in the third region 232 (indicated by "pair") are arranged in a state with an inclined angle toward the direction in which they approach each other. That is, the distance between the first LED 230a and the second LED 230b may gradually decrease in a direction from the bottom surface to the top surface of the first LED 230a and the second LED 230b.

[0138] As described above, when LEDs are arranged symmetrically in pairs with adjacent pixels, the biased light distributions (a, b) generated by the crystal structure of the LEDs can cancel each other. In other words, the problem that the color looks different depending on the viewing direction when the display device is viewed from the outside can be solved.

[0139] Figure 5 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs according to an embodiment of the present disclosure.

[0140] Figure 5 The state in which the first LED 230a and the second LED 230b adjacent to each other are positioned to have the first arrangement and the second arrangement different from each other is shown. In addition, the second LED 230b and the third LED 230c may also be positioned to have the arrangement different from each other.

[0141] For example, the first LED 230a and the third LED 230c may be located in a first arrangement, and the second LED 230b disposed between the first LED 230a and the third LED 230c may be located in a second arrangement.

[0142] At this time, the first LED 230a, the second LED 230b, and the third LED 230c may all be light emitting diodes (LEDs) emitting light of the same color. For example, the first LED 230a, the second LED 230b, and the third LED 230c may all be blue LEDs.

[0143] Here, the first arrangement may be that the N electrode 235 is located at Figure 5 The left side of the P electrode 237 is located Figure 5 In each LED (230a, 230b, 230c), a semiconductor layer 232 may be located on a substrate 231, and a first type electrode (e.g., an N-type electrode 235) and a second type electrode (e.g., a P-type electrode 237) may be arranged to contact the semiconductor layer 232.

[0144] That is, each LED (230a, 230b, 230c) may include a substrate 231, a semiconductor layer 232, a first type electrode 235, and a second type electrode 237. At this time, the corresponding LEDs (230a, 230b, 230c) may have different arrangements relative to the direction in which the first type electrode 235 and the second type electrode 237 are connected to each other.

[0145] Reference Figure 5, the LEDs (230a, 230b, 230c) may have an asymmetric light distribution ("a" or "b") relative to the direction along which the first type electrode 235 and the second type electrode 237 are connected to each other. For example, the first LED 230a and the third LED 230c may have a light distribution (a) biased to the left. This may correspond to the first arrangement. In addition, the second LED 230b located between the first LED 230a and the third LED 230c may have a light distribution (b) biased to the right. This structure may correspond to the second arrangement.

[0146] This structure may be a result of material properties of at least one of the substrate 231 and the semiconductor layer 232. For example, the above phenomenon may occur because the crystal structure of at least one of the substrate 231 and the semiconductor layer 232 has an inclined shape. This will be described in detail later.

[0147] Figure 6 is a schematic diagram showing the effect of sub-pixel arrangement of a display device using semiconductor LEDs according to an embodiment of the present disclosure.

[0148] Reference Figure 6 , LEDs (230b, 230c) may be mounted on the wiring substrate 100 to form sub-pixels.

[0149] At this time, refer to Figure 6 In (B), the wiring substrate 100 may include wiring electrodes (123, 124), the wiring electrodes including a first wiring electrode 123 and a second wiring electrode 124 arranged on the wiring substrate 100, as described above with reference to Figure 1 The LEDs (230b, 230c) in each unit pixel region are electrically connected to the first wiring electrode 123 and the second wiring electrode 124. That is, Figure 6 The sub-pixel arrangement may correspond to Figure 1 The case of the blue LED 230.

[0150] Here, let’s refer to Figure 6 (A) and Figure 6 In (B), the LEDs (230b, 230c) may include a first LED 230b and a second LED 230c. The first LED 230b may be disposed in a first pixel region and may be installed to have a first arrangement. The second LED 230c may be disposed in a second pixel region adjacent to the first pixel region and may be installed to have a second arrangement symmetrical to the first arrangement.

[0151] Each of the first light emitting diode 230b and the second light emitting diode 230c may include a substrate 231, a semiconductor layer 232, a first type electrode 235 and a second type electrode 237. In this regard, the first light emitting diode 230b and the second light emitting diode 230c may have different arrangements with respect to a direction connecting the first type electrode 235 and the second type electrode 237 to each other.

[0152] Therefore, the light distribution a biased to one side by the first arrangement and the light distribution b biased to the other side by the second arrangement can be combined to form a light distribution "c" that is not biased and faces the center. That is, the asymmetric light distribution can be canceled by the first arrangement of the first light-emitting diode 230b and the second arrangement of the second light-emitting diode 230c, as described above.

[0153] In this regard, as described above, the first light emitting diode 230 b and the second light emitting diode 230 c may be light emitting diodes emitting light of the same color, for example, blue light emitting diodes, located in adjacent pixel regions.

[0154] When a positive voltage is applied to a light emitting diode (LED) having a PN junction structure, charges and holes are recombined with each other in the region where the P region and the N region meet each other to emit light. At this point, the portion that emits the largest amount of light is not the center of the region where the P region and the N region meet each other, but is biased. Therefore, when a display is manufactured by such an LED, the color of the display may look different depending on the direction in which the display is viewed.

[0155] However, as described above, when the first arrangement of the first light emitting diodes 230b and the second arrangement of the second light emitting diodes 230c are symmetrical to each other, the color difference of the display perceived on the left and right sides when the display is viewed from one side can be compensated by visually reinforcing the area with weak color. Therefore, the effect of enhancing the color viewing angle in the final product stage of the display device can be obtained.

[0156] In addition, by symmetrically arranging the first light emitting diode 230b and the second light emitting diode 230c, the electric field formed by the polarity difference between the light emitting diodes 230b and 230c can be removed, thereby preventing the generation of parasitic capacitance. In addition, the ghosting phenomenon that may occur due to such parasitic capacitance can be improved.

[0157] Figure 7 It is shown that the formation Figure 2 Schematic diagram of the sub-pixel arrangement process shown.

[0158] Will refer to Figure 7 An example of a method of transferring light emitting diodes (LEDs) to have different arrangements is briefly described.

[0159] For example, the LEDs (230a, 230c) are first transferred to the electrode pads (#1, #3, etc.) of the odd columns on the wiring substrate. Thereafter, the position of the LED is rotated 180 degrees, and then the LEDs (230a, 230c) are transferred to the electrode pads (#2, #4, etc.) of the even columns on the wiring substrate.

[0160] After being transferred to the transfer substrate 410, the LEDs (230a to 230d) may be transferred to a wiring substrate while being located on the wafer 500. Here, the transfer substrate 410 may be, for example, a blue ribbon.

[0161] First, the LEDs (230a, 230c) may be transferred to the transfer substrate 410 in a state of being arranged the same as the upper side ① (ie, in a state in which the reference point M of the wafer 500 is located at the left side).

[0162] Subsequently, the LEDs ( 230 a , 230 c ) transferred to the transfer substrate 410 may be transferred to the electrode pads ( # 1 , # 3 , etc.) of the odd-numbered columns of the wiring substrate.

[0163] Thereafter, in a state where the wafer 500 is rotated 180 degrees on the lower side as shown in ② (ie, in a state where the reference point M of the wafer 500 is located on the right side), the LEDs ( 230 b , 230 d ) may be transferred to the transfer substrate 410 .

[0164] Subsequently, the LEDs ( 230 b , 230 d ) transferred to the transfer substrate 410 may be transferred to the electrode pads ( # 2 , # 4 , etc.) of the even-numbered columns of the wiring substrate.

[0165] Through the above process, Figures 2 to 4 The LEDs (230a-230h) arranged as shown may be transferred onto a wiring substrate.

[0166] Figure 8 is a side photographic image showing each light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure. Fig. 9 is a schematic diagram illustrating a tilt angle of each light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure.

[0167] Figure 8 is an enlarged photograph image showing a side surface of the blue LED 230 . Figure 8 It may represent a sapphire substrate that forms most of the thickness of the blue LED 230. Fig. 9 As shown, the tilt angle α of the blue LED 230 may be about 10 degrees. In addition, as an example, the thickness (t) of the blue LED 230 may be 80 μm.

[0168] However, the gallium nitride semiconductor layer located on the sapphire substrate may also have the same or similar tilt angle. In some cases, the sapphire substrate may be removed after the light emitting diode (LED) is manufactured. In this case, the gallium nitride-based semiconductor layer of the light emitting diode (LED) may have the above tilt angle instead of the substrate.

[0169] As such, the LED (210, 220, 230) may have a cross section or a side surface formed in a parallelogram.

[0170] According to the tilt angle (α), there is a deviation (offset or bias) (F, F') of the light emitting diode (LED) 230 between the light emitting surface (E) of the blue LED 230 and the opposite surface (hereinafter referred to as the bonding surface) 234 of the light emitting surface. For the ideal case where the cross section or side surface of the LED 230 is formed in a rectangular shape, such deviations (F, F') can be regarded as the amount of change between the bonding surface 234 and the light emitting surface (E). Hereinafter, for the convenience of description, these deviations (F, F') may also be referred to as offsets.

[0171] Thus, a length / area difference may occur between the bonding surface 234 and the light emitting surface (E) of the LED 230, as shown by the offset (F, F'). For example, the position of the LED 230 viewed from the light emitting surface (E) may be different from the position of the LED 230 viewed from the bonding surface (234).

[0172] For example, when subpixels are configured by arranging electrode pads (132, 142) at regular intervals (pitch) based on the bonding surface 234 of the LED 230 as is generally the case, the distance between the light emitting surfaces (E) can be increased or decreased by the offset (F or F').

[0173] Therefore, in a manufacturing process of a display device using LEDs (210, 220, 230), when the interval between electrode pads (130, 140 / 131, 141 / 132, 142) connected to the LEDs (210, 220, 230) is set to a sub-pixel pitch in response to a bonding surface 234 of the LEDs (210, 220, 230), the sub-pixel pitch may be changed by an offset (F, F') when viewed from a light emitting surface (E).

[0174] Here, in the longitudinal direction, the tilt angle (α) of the blue LED 230 may be the same on both sides of the LED 230. In this case, in the longitudinal direction, the offsets (F, F') on both sides of the blue LED 230 may be equal to each other (ie, F=F').

[0175] The above contents may also be similarly applied to the red LED 210 or the green LED 220 instead of the blue LED 230 .

[0176] In view of the above, in the manufacturing process of the display device using the LED (210, 220, 230), when the electrode pad (130, 140 / 131, 141 / 132, 142) connected to the LED (210, 220, 230) is set to a sub-pixel pitch in response to the light emitting surface (E) of the LED (210, 220, 230), a uniform sub-pixel pitch can be obtained on the light emitting surface (E) side regardless of the offset (F, F'). In this case, the interval between the electrode pads (130, 140 / 131, 141 / 132, 142) can be changed by compensating for the offset (F, F').

[0177] The above contents will be described in detail later.

[0178] Fig.10 Schematic diagram of a sapphire crystal plane and a sapphire crystal direction. Sapphire can be used as a growth substrate for LEDs made of gallium nitride-based semiconductors.

[0179] Reference Fig.10 , sapphire has an inclined crystal plane. For example, the R-plane may have a crystal plane inclined toward the m-axis. Generally, sapphire may have the R-plane as its own growth plane. Fig.10 As shown, since the R-plane has an inclined surface relative to the hexagonal columnar crystal shape, the sapphire substrate and the gallium nitride-based semiconductor grown on the crystal plane of the sapphire substrate can have such an inclined tilt angle.

[0180] Furthermore, after forming an LED having a gallium nitride-based semiconductor on a sapphire substrate, such an inclination angle can also be formed due to cutting performed in the direction of the crystal plane of the sapphire substrate, so that the above-mentioned inclination angle can be formed.

[0181] Fig.11 is a view showing a side photograph image of a light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure. Fig.12 2 is a schematic diagram showing a tilt angle of a light emitting diode (LED) of a display device using a semiconductor LED according to an embodiment of the present disclosure. Fig.13 is a view showing a side photograph image of a light emitting diode (LED) of a display device using a semiconductor LED according to another embodiment of the present disclosure.

[0182] Reference Fig.11 and Fig.12, light emitting diodes (LEDs) that can be used in displays can have various tilt angles. For example, Fig.11 (A) and Fig.12 Each LED shown in (A) may have a tilt angle of 5 degrees or less along one direction.

[0183] also, Fig.11 (B) and Fig.12 Each LED shown in (B) may have a Fig.11 (A) and Fig.12 The tilt angle of the LED shown in (A) is in the opposite direction to the tilt angle of 12 degrees or less.

[0184] also, Fig.11 (C) and Fig.12 The LEDs shown in (C) are aligned with Fig.11 (B) and Fig.12 The inclination angle of the LED shown in (B) in the same direction can have an inclination angle of 10 degrees or less.

[0185] As described above, the LED may have a parallelogram structure, the side cross section of which is inclined to one side. As a result, the LED may have a light emission pattern that is uneven and biased to one side relative to the direction perpendicular to the side surface.

[0186] The tilt angle direction of the LED can be different depending on the LED. Fig.11 In (A), it can be seen that the tilt angle direction of the red LED 210 is different from the tilt angle direction of the blue LED 230 described above.

[0187] Reference Fig.11 In (A), when the first type electrode is a positive electrode and the second type electrode is a negative electrode, the red LED 210 may be tilted toward the negative electrode relative to the light emitting surface (top surface). Fig.11 In (B), the green LED 220 may be tilted toward the positive electrode relative to the LED (top surface). Fig.11 In (C), the blue LED 230 may be inclined toward the positive electrode with respect to the light emitting surface (top surface) in the same manner as the green LED 220 .

[0188] At the same time, refer to Fig.13 In (A), when the first type electrode is a positive electrode and the second type electrode is a negative electrode, the red LED 210 may be tilted toward the positive electrode relative to the light emitting surface (top surface). Fig.13 In (B), the green LED 220 may be tilted toward the negative electrode relative to the light emitting surface (top surface). Fig.13In (C), the blue LED 230 may be inclined toward the negative electrode with respect to the light emitting surface (top surface) in the same manner as the green LED 220 .

[0189] In this way, the tilt angle of the LEDs (210, 220, 230) may be determined in various ways according to manufacturing conditions and states. Figures 11 to 13 The tilt angles of the LEDs (210, 220, 230) shown in FIG. Figures 11 to 13 The arrangement of the positive electrode (+) and the negative electrode (-) of the LEDs (210, 220, 230) shown in the figure is only an example, and there may be other arrangements as needed. Figures 11 to 13 According to the embodiments of the present disclosure, LEDs with various tilt angles and arrangements of positive electrodes (+) and negative electrodes (-) may be used. (210, 220, 230).

[0190] Fig.14 is a schematic diagram showing an example of sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle.

[0191] Reference Fig.14 , the wiring substrate 100 may be omitted, and the arrangement of the electrode pads (130, 140 / 131, 141 / 132, 142) and the arrangement of the LEDs (210, 220, 230) connected to the electrode pads (130, 140 / 131, 141 / 132, 142) are schematically shown.

[0192] Here, the red LEDs 210 may be arranged in one direction, and the green LEDs 220 may be arranged in a direction adjacent to the arrangement of the red LEDs 210. In addition, the blue LEDs 230 may be arranged in a direction adjacent to the arrangement of the green LEDs 220. At this time, each adjacent LED (210, 220, 230) may form a sub-pixel. For example, a group of red LEDs 210, green LEDs 220, and blue LEDs 230 adjacent to each other may form one pixel.

[0193] Fig.14 The state where the electrode pads (130, 140 / 131, 141 / 132, 142) are arranged at regular intervals (A) is shown. That is, the intervals of the electrode pads (130, 140 / 131, 141 / 132, 142) connected to the LEDs (210, 220, 230) can be set as the sub-pixel pitch according to the bonding surface 234 of the LEDs (210, 220, 230).

[0194] In this way, when the electrode pads (130, 140 / 131, 141 / 132, 142) are arranged at regular intervals (A), due to the characteristics of the LEDs having respective tilt angles, the sub-pixel pitch can vary on the light emitting surface (E) of the LEDs (210, 220, 230).

[0195] Reference Fig.14 , it can be seen that the electrode pads (130, 140 / 131, 141 / 132, 142) are spaced apart from each other by a constant distance (A), but the intervals (a, b, c) between the LEDs (210, 220 230) change. Here, it can be seen that the distance (b) between the light emitting surfaces of the second LED and the third LED is longer than the distance (a) between the light emitting surfaces of the first LED and the second LED. In addition, "c" indicating the gap between the light emitting surfaces of the third LED and the fourth LED may be smaller than "b". In fact, "a" and "c" may be the same.

[0196] As described above, depending on the tilt angle (α) of the LEDs (210, 220, 230), a difference in length / area between the bonding surface 234 and the light emitting surface (E) of the LEDs (210, 220, 230) may occur due to the offset F or F'. Therefore, the gap between the light emitting surfaces (E) may be increased or decreased by the offset F or F'.

[0197] Fig.15 : is a schematic diagram showing an example of a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to the first embodiment of the present disclosure.

[0198] As described above, in the manufacturing process of the display device using the LED (210, 220, 230), when the interval between the electrode pads (130, 140 / 131, 141 / 132, 142) connected to the LED (210, 220, 230) is set to a sub-pixel pitch in response to the light emitting surface (E) of the LED (210, 220, 230), when viewed from the light emitting surface (E) of the LED (210, 220, 230), it can be offset to ensure a uniform sub-pixel pitch regardless of the offset (F, F'). In this case, the interval between the electrode pads (130, 140 / 131, 141 / 132, 142) can be changed according to the compensation result of the offset (F, F').

[0199] Reference Fig.15, "a" indicates the distance between the light emitting surfaces of the first LED and the second LED, "b" indicates the distance between the light emitting surfaces of the second LED and the third LED, and "c" indicates the distance between the light emitting surfaces of the third LED and the fourth LED, and these distances can be adjusted to be the same as each other so that the spacing between the electrode pads (130, 140 / 131, 141 / 132, 142) can be changed according to the position of the electrode pads. That is, the spacing between the electrode pads (130, 140 / 131, 141 / 132, 142) can be changed according to the position of the electrode pads.

[0200] Meanwhile, when a first distance between the bonding surfaces of the first LED and the second LED positioned continuously is compared with a second distance between the bonding surfaces of the second LED and the third LED, the first distance and the second distance may be different from each other. The structure may correspond to the distance between the corresponding electrode pads.

[0201] In this way, the distance between adjacent LEDs based on the light emitting surface of the LEDs may be the same, but the distance between adjacent LEDs based on the bonding surface of the LEDs may vary.

[0202] As above Figure 2 and Figure 3 As described above, the LEDs (210, 220, 230) are arranged symmetrically to each other in one direction. This structure may correspond to a state where the LEDs are arranged in parallel in one direction.

[0203] In this way, a state in which each LED (210, 220, 230) has a tilted crystal structure is schematically shown. In particular, when comparing any two pixels adjacent to each other, two LEDs (e.g., a first LED and a second LED) belonging to the two pixels may have tilt angles that are symmetrical to each other. For example, the first LED and the second LED may be tilted at a certain angle in such a way that when the light emitting surfaces of the first LED and the second LED move away from the pad, the light emitting surfaces of the first LED and the second LED move closer to each other. In addition, the second LED and the third LED may have an angle of inclination in a direction in which the light emitting surfaces of the second LED and the third LED move away from each other as the light emitting surfaces move away from the pad.

[0204] Reference Fig.15 , from the perspective of the arrangement of LEDs emitting the same color light, the intervals (a, b, c) between the light emitting surfaces are determined to be the same (a=b=c). In this case, the intervals (A, B, C) of the electrode pads (130, 140 / 131, 141 / 132, 142) may be different from each other.

[0205] The pad spacing (A) between two LEDs corresponding to an angle inclined in a direction in which the light emitting surfaces move closer to each other and proportional to an increase in the distance away from the pad may be greater than the pad spacing (B) between two LEDs corresponding to an angle inclined in a direction in which the light emitting surfaces move away from the pad. Such pad spacings (A, B) may be repeatedly arranged. In other words, referring to Fig.15 , the interval (A) between the pads corresponding to the first LED and the second LED may be equal to the interval (C) between the pads corresponding to the third LED and the fourth LED.

[0206] As described above, the display device according to the embodiment of the present disclosure may include a wiring substrate 100 (see FIG. 1 ) on which a plurality of unit pixels are defined. Figure 2 ), electrode pads (130, 140 / 131, 141 / 132, 142) arranged on a unit pixel to define a plurality of unit sub-pixels, and light emitting diodes (210, 220, 230) electrically connected to the electrode pads (130, 140 / 131, 141 / 132, 142) so that each LED has a side surface with an inclination angle biased to one side.

[0207] According to an exemplary embodiment, two adjacent LEDs are arranged symmetrically with respect to the tilt angle, and the distance (A, B, C) between two adjacent electrode pads can be changed. The arrangement of these LEDs and electrode pads can correspond to the arrangement of a first LED that emits a first color light in a first direction, for example, a red LED that emits red light. In addition, the arrangement of these LEDs and electrode pads can correspond to the arrangement of a second LED that emits a second color light in a second direction, for example, a green LED that emits green light. In addition, the arrangement of these LEDs and electrode pads can correspond to the arrangement of a third LED that emits a third color light in a third direction, for example, a blue LED that emits blue light.

[0208] Here, the first direction may refer to a direction in which LEDs emitting light of the same color are arranged. The second direction may be substantially the same as (parallel to) the first direction, but may be spaced apart from the first direction by a sub-pixel interval (i.e., the interval between sub-pixels). Similarly, the third direction may be substantially the same as (parallel to) the second direction, but may be spaced apart from the second direction by a sub-pixel interval.

[0209] On the other hand, the pixel unit may be formed along a direction intersecting the first direction, the second direction, and the third direction. Fig.15 , Fig.15 The three LEDs (210, 220, 230) on the left side shown in FIG. 1 can form one pixel.

[0210] In this way, relative to the arrangement of LEDs (210, 220, 230) emitting light of the same color, two adjacent LEDs can be positioned symmetrically relative to the tilt angle, so that the opposite (or face-to-face) LEDs have the same electrode polarity as the two adjacent LEDs, and the distance between two adjacent electrode pads (130, 140 / 131, 141 / 132, 142) can vary according to the arrangement direction of the LEDs emitting light of the corresponding color.

[0211] In an exemplary embodiment, the electrode polarities of the LEDs (210, 220, 230) connected to two adjacent electrode pads may be arranged so that the same polarities face each other. For example, when the first type electrode (e.g., N-type electrode) and the second type electrode (e.g., P-type electrode) are located at positions where the LEDs (210, 220, 230) are fixed relative to the tilt angle, the two adjacent LEDs are arranged so that the tilt angles are symmetrical to each other, and the polarities of the facing positions of the two adjacent LEDs may be the same.

[0212] Figures 16 to 18 is a schematic diagram showing an example of arrangement of light emitting diodes (LEDs) each having an inclined angle. Figures 16 to 18 The example of a red LED 210 is shown, which has a light emitting surface (E) and a bonding surface 212, respectively, but Figures 16 to 18 The same concept can be applied to green and blue LEDs.

[0213] Fig.16 An example is shown in which LEDs 210 having an inclination angle are arranged in the same direction and at regular intervals (a') based on the inclination angle / electrode position. In this case, the distance between the center points of the bonding surface 212 can be the same distance represented by "A". Therefore, the distance between the center points of the electrode pads 130 and 140 can also be the same. In this case, the distance between the light emitting surfaces (E) of two adjacent LEDs 210 can be the same distance represented by (a').

[0214] Fig.17 The situation can correspond to the above reference Fig.14 The case described, that is, an example is shown in which the LEDs 210 with an inclination angle are arranged at regular intervals (a') along the symmetric direction based on the inclination angle / electrode position. In this case, the distance between the center points of the bonding surface 212 can be the same distance represented by "A". Therefore, the distance between the center points of the electrode pads 130 and 140 can also be the same. In this case, the distance between the light emitting surfaces (E) can vary (a, b, c, b>a, c, a=c).

[0215] Fig.18The situation can correspond to the above reference Fig.15 That is, an example is shown in which the LEDs 210 with an inclination angle are arranged at different intervals (a, b, c) along the symmetric direction based on the inclination angle / electrode position. In this case, the distance between the center points of the bonding surface 212 can be changed to A→B→C. Therefore, the distance between the center points of the electrode pads 130 and 140 can also be changed equally.

[0216] As described above, the distance between the center points of the bonding surfaces 212 of the LEDs 210 may be changed so that the distances (a, b, c) between the light emitting surfaces (E) are the same (a=b=c).

[0217] Therefore, the distance between the center points of the electrode pads 130 and 140 may also be changed so that the distances (a, b, c) between the light emitting surfaces (E) are the same (a=b=c, A>B, C>B, A=C).

[0218] At this time, the distance between the center points of the electrode pads 130 and 140 or the distance between the center points of the bonding surface 212 of the LED 210 can be changed to compensate for the offset (F) caused by the tilt angle. In other words, the distance (A, B, C) between two adjacent electrode pads can be changed by the offset (F) caused by the tilt angle.

[0219] For example, the distances (A, B, C) between two adjacent electrode pads (between the center points of the bonding surfaces of the LEDs) may include a first distance (A) and a second distance (B) that are different from each other. For example, the first distance (A) and the second distance (B) may be repeatedly positioned (A=C).

[0220] In an exemplary embodiment, the distance between two adjacent electrode pads (between the center points of the bonding surfaces of the LEDs) may include a first distance (A) corresponding to an inclination angle at which the light emitting surfaces (E) of the light emitting diodes 210 approach each other, and a second distance (B) corresponding to an inclination angle at which the light emitting surfaces (E) of the LEDs 210 move away from each other. In this case, the second distance B may be smaller than the first distance A (ie, A>B).

[0221] From another perspective, adjacent LEDs arranged in a first direction are arranged symmetrically relative to the tilt angle, wherein a first LED emitting a first color light is arranged in the first direction, so that the electrode polarities of relative LEDs are the same, and the sub-pixel spacing defined by the distance between the electrode pads can vary according to the direction of the tilt angle.

[0222] In other words, for example, when red LEDs 210 emitting red light are arranged adjacent to each other in one direction, the adjacent LEDs 210 are arranged symmetrically with respect to the tilt angle so that the LEDs 210 have the same electrode polarity. The sub-pixel pitch (A, B, C) defined by the distance between the electrode pads (or the distance between the center points of the bonding surfaces of the light emitting diodes 210) may vary depending on the direction of the tilt angle.

[0223] In an exemplary embodiment, the sub-pixel pitches (A, B, C) may include a first sub-pixel pitch (A) and a second sub-pixel pitch (B). For example, the first sub-pixel pitch (A) and the second sub-pixel pitch (B) may be alternately positioned in only one direction (A=C).

[0224] In other words, the sub-pixel pitches (A, B, C) may include a first sub-pixel pitch (A) corresponding to an inclination angle at which the light emitting surfaces (E) of the light emitting diodes 210 approach each other, and a second sub-pixel pitch (B) corresponding to an inclination angle at which the light emitting surfaces (E) of the LEDs 210 move away from each other. In this case, the second sub-pixel pitch (B) may be smaller than the first sub-pixel pitch (A) (i.e., A>B).

[0225] Fig.19 is a conceptual diagram showing a light emitting pattern of a light emitting diode having an inclined angle.

[0226] Reference Fig.19 , schematically illustrates an LED 210 having a tilt angle, specifically, an LED 210 having a side angle tilt (tilt) angle different from 90 degrees.

[0227] Hereinafter, as an example, the red LED 210 will be described, but the description also applies to the green LED 220 and the blue LED 230 .

[0228] The light emitting layer of LED 210 can be positioned close to the bonding surface 212. Most of the upper side of LED 212 can occupy a large thickness. The light generated from the light emitting layer can be emitted toward the light emitting surface (E). At this time, there is light directly reaching the light emitting surface (E) and then emitting from the light emitting surface (E). However, in theory, light is emitted in all directions from the light emitting layer, so that there is light emitted toward the first side 213 and the second side 214.

[0229] As described above, due to the tilt angle in the light beam emitted toward the first side surface 213 and the second side surface 214 , a portion of the light beam emitted toward the first side surface 213 cannot pass through the first side surface 213 due to a small incident angle and may be completely reflected into the LED 210 .

[0230] On the other hand, even if the light emitted toward the second side surface 214 is completely reflected from the second side surface 214, the light may be reflected in a diagonal direction (i.e., a direction toward the first side surface 213) due to the tilt angle, and may be emitted through the light emitting surface (E). Therefore, in the structure of the LED 210 in which the light emitting surface (E) is tilted toward the second side surface 214, the light emitting pattern may be formed in an elliptical shape tilted toward the first side surface 213 opposite to the second side surface 214. This is one of the reasons why the LED 210 having the tilt angle presents an asymmetric light emitting pattern.

[0231] Fig. 20 It is a schematic diagram showing the Fig.14 A view of an arrangement showing the light distribution of the device. Fig.21 is a view showing a microscope analysis showing that Fig.14 The arrangement of the display device actually emits light.

[0232] Fig. 22 It is shown that according to Fig.14 A schematic diagram of the arrangement of the display device and a view of the light distribution viewed from the front. Fig.23 It is shown that according to Fig.14 A view of the light distribution of the display device as viewed from the side and a schematic diagram thereof.

[0233] Reference Fig. 20 , showing that the asymmetric light distribution of the LED 210 with the above-mentioned tilt angle can be offset by the symmetrical arrangement of the LED 210 with respect to the tilt angle of the LED 210. This is consistent with the previous reference Figure 6 Consistent with what described.

[0234] However, based on the light emitting surface (E), it can be seen that the position of the light emitting surface (E) is shifted according to the tilt angle, which causes the interval difference between the LEDs as described above.

[0235] For example, it can be seen that the distance between the light emitting surfaces (E) of the first LED and the second LED is represented by D1, but the distance between the light emitting surfaces (E) of the second LED and the third LED is represented by D2. Fig. 20 As shown, the distance (sub-pixel pitch) can be repeatedly expressed as D1→D2→D1→D2.

[0236] Fig.21 This is an image formed when light emitted from two adjacent LEDs is captured using a microscope in a state where a green pattern is displayed on a display device. Fig.21 In the figure, the circle is what the actual glowing green pattern looks like.

[0237] Reference Fig.21, shows an image formed by the light emission of two adjacent LEDs for four pixel pitches (P1, P2, P3, P4). Here, since LEDs emitting the same color light (e.g., green LEDs) are associated with the image, the pixel pitch can also be regarded as a sub-pixel pitch. That is, Fig.21 P2, P3 and P4 shown in the figure may represent that the light is actually generated by the above reference Fig.14 The described state is an arrangement of LEDs with different (sub)pixel pitches.

[0238] Here, P1 and P2 have the same (sub) pixel pitch, but in the case of P1, the LEDs are arranged in the same direction with respect to the tilt angle. Therefore, although the light emission pattern is non-uniform, the intervals between the light emission surfaces are the same as each other.

[0239] The (sub) pixel pitch may gradually increase in the direction from P2 to P4. Here, in the case of P2, it can be seen that the dark portion (H) becomes visible between the LEDs. In particular, when the light emitting surfaces are arranged away from each other, the dark portion (H) may be visible between the light emitting surfaces.

[0240] This may mean that as the pitch becomes finer, the offset caused by the tilt angle may affect the displayed image. When the (sub) pixel pitch is relatively large, the ratio of the offset length may be relatively small or negligible, but when the (sub) pixel pitch is relatively small, the ratio of the offset length becomes relatively large, so that a dark portion (H) can be identified as in the case of P2.

[0241] Reference Fig. 22 , schematically explains why the above phenomenon occurs.

[0242] like Fig.14 As shown in the arrangement shown, when LEDs 210 and 211 are arranged at equal intervals based on the bonding surface, that is, when LED 210 is arranged at the same intervals based on the electrode pads, the interval (spacing) between the center points (G) of the LEDs (210, 211) can be repeated, as shown by D1 / D2.

[0243] Thus, depending on the viewing distance or the overall pixel pitch of the display device, dark areas may be visible between the relatively longer pitches D2.

[0244] Fig. 22 The schematic diagram shows the appearance of the light emission of the display device when the display device is viewed from the front. Fig.19As described, inclined light distribution patterns (V, V') may appear, but when the display device is viewed from the front and the inclined light distribution patterns (V, V') of the display are observed, these inclined distribution patterns (V, V') may not substantially affect the display.

[0245] In other words, when the display device is viewed from the front, only the shift of the LEDs according to the tilt angle affects the display, so that the vertical lines affected by the shift of the LEDs are almost invisible.

[0246] However, when viewed from the side, that is, at a viewing angle Fig.23 When the display device is shown, it can be seen that the brightness difference due to the light emitting surface offset phenomenon and the light distribution characteristics increases.

[0247] For example, when the light distribution pattern (V) and the light emission direction (G") are different from each other (see "210"), the brightness is relatively weakened, but when the light distribution pattern (V') and the light emission direction (G') are the same (see "211"), it can be seen that the brightness is relatively increased.

[0248] Due to this weighted difference in brightness, the vertical lines may be slightly visible at the viewing angle of the display device.

[0249] Fig.24 It shows that according to Fig.15 A view of an arrangement showing the light distribution of the device. Fig.25 It is shown that according to Fig.15 A schematic diagram of the arrangement of the display device and a view of the light distribution viewed from the front. Fig.26 It is shown that according to Fig.15 A view of the light distribution of the display device as viewed from the side and a schematic diagram thereof.

[0250] Reference Fig.24 , showing that the asymmetric light distribution of the LED 210 with the above-mentioned tilt angle can be offset by the symmetrical arrangement of the LED 210 with respect to the tilt angle. Figure 6 Consistent with what described.

[0251] Furthermore, it can be seen that no offset occurs in the distance between the light emitting surfaces (E), and the distance between the light emitting surfaces (E) is constant, as indicated by “D.” For example, the distance between the odd-numbered LEDs 210 and the even-numbered LEDs 211 is constant, as indicated by “D.”

[0252] Reference Fig.25 , schematically explains why the above phenomenon occurs. Fig.15As shown in the illustrated arrangement, when the LEDs (210, 211) are arranged at equal intervals based on the light emitting surface (E), the interval (pitch) between the light emitting centers (G) of the LEDs (210, 211) may be constant as indicated by "D".

[0253] Therefore, depending on the viewing distance or the overall pixel pitch of the display device, dark areas may be visible between relatively longer pitches D2.

[0254] Fig. 22 The appearance of the light emission when the display device is viewed from the front is schematically shown. Fig.19 As described above, an inclined light distribution pattern (V, V') is presented, but when viewed from the front, the inclined light distribution pattern (V, V') may not substantially affect the display. In addition, since the distance (pitch) between the centers (G) of the LEDs is constant as shown by "D", the possibility of obtaining the effect caused by the light distribution pattern (V, V') can be further reduced.

[0255] In other words, when the display device is viewed from the front, the offset of the light emitting surface according to the tilt angle may not affect the realization of the display, so that the resulting vertical line may be barely visible.

[0256] On the other hand, when viewed from the side Fig.26 When the display device is shown, that is, even at a viewing angle, the distance (pitch) between the centers (G) of the LEDs is constant as shown by "D", so that no brightness difference due to the light distribution characteristics occurs.

[0257] For example, when the light distribution pattern (V) and the light emission direction (G") are different from each other (210), the brightness becomes relatively weak. On the contrary, when the light distribution pattern (V') and the light emission direction (G') are the same as each other (211), it can be seen that the brightness increases relatively.

[0258] However, due to the constant spacing between the light emitting surfaces (E), this brightness difference may be weakened, so the vertical line may not be visible even at the viewing angle of the display device.

[0259] As mentioned above Fig.11 and Fig.13 As described above, the electrode positions of the LEDs may be different. For example, the red LED 210 may have Fig.11 As shown in (A) or as Fig.13 The electrode arrangement is shown in (A) of FIG. This is the same for the green and blue LEDs 220 and 230.

[0260] Therefore, the arrangement of LEDs according to the tilt angle may be different for each color. Therefore, various embodiments are possible. According to various embodiments of the present disclosure, various phenomena that may occur due to the tilt angle of the LED or the tilted light distribution pattern (V, V') can be effectively removed, for example, a phenomenon in which a dark area is visible, a phenomenon in which a vertical line is visible, and a phenomenon in which light appears irregular, etc. In other words, since the arrangement of LEDs emitting light of different colors is configured differently, various phenomena that may occur due to the tilt angle of the LED or the tilted light distribution pattern (V, V') can effectively offset each other.

[0261] This will be referenced below Figures 27 to 32 Give a description.

[0262] Fig. 27 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a second embodiment of the present disclosure.

[0263] Reference Fig. 27 , the arrangement of the green and blue LEDs 220 and 230 is Fig.15 However, the arrangement of the red LED 211 is configured so that when the distance from the light emitting surface (E) becomes shorter, the inclination angle of the first type electrode (e.g., N-type electrode) and the second type electrode (e.g., P-type electrode) of the first LED 211 gradually shifts to the left.

[0264] In this case, in the arrangement of green and blue LEDs 220 and 230, the intervals (a, b, c) between the light emitting surfaces (E) are all the same (a=b=c), and the distance between the centers of the electrode pads (131, 141 / 132, 142) is variable (A>B, A=C).

[0265] However, the inclination angle of the red LED 211 is opposite to the inclination angles of the adjacent green and blue LEDs 220 and 230. At this time, the arrangement of the red LED 211 is configured so that the intervals (a', b', c') between the light emitting surfaces (E) are all the same (a'=b'=c'), and the distance between the centers of the electrode pads (130, 140) is variable (A'>B', A'=C').

[0266] At this time, the distance (A', B', C') between the centers of the electrode pads (130, 140) of the red LED 211 may become different from the distance (A, B, C) between the centers of the electrode pads (131, 141 / 132, 142) of the green and blue LEDs (220, 230). At this time, in some cases, A may be equal to B'.

[0267] Fig.28 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a third embodiment of the present disclosure.

[0268] Reference Fig.28 , the arrangement of the red and blue LEDs (210, 230) and Fig.15 However, the arrangement of the red LED 211 is configured so that when the distance from the light emitting surface (E) becomes shorter, the first type electrode (e.g., N-type electrode) of the first LED 221 and the second type electrode (e.g., P-type electrode) have an inclination angle gradually biased to the left.

[0269] In this case, in the arrangement of the red and blue LEDs 210 and 230, the intervals (a, b, c) between the light emitting surfaces (E) are all the same (a=b=c), and the distance between the centers of the electrode pads (131, 141 / 132, 142) is variable (A>B, A=C).

[0270] However, the inclination angle of the green LED 221 is opposite to the inclination angles of the adjacent red and blue LEDs 210 and 230. At this time, the arrangement of the green LED 221 is configured so that the intervals (a', b', c') between the light emitting surfaces (E) are all the same (a'=b'=c'), and the distance between the centers of the electrode pads (131, 141) is variable (A'>B', A'=C').

[0271] At this time, the distance (A', B', C') between the centers of the electrode pads (131, 141) of the green LED 221 may become different from the distance (A, B, C) between the centers of the electrode pads (130, 140 / 132, 142) of the red and blue LEDs (210, 230). At this time, in some cases, A may be equal to B'.

[0272] Fig.29 4 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a fourth embodiment of the present disclosure.

[0273] Reference Fig.29 , the arrangement of the red and green LEDs (210, 220) and Fig.15 However, the arrangement of the blue LED 233 is configured so that when the distance from the light emitting surface (E) becomes shorter, the first type electrode (e.g., N-type electrode) of the first LED 233 and the second type electrode (e.g., P-type electrode) have an inclination angle that is gradually biased to the left.

[0274] In this case, in the arrangement of the red and green LEDs 210 and 220, the intervals (a, b, c) between the light emitting surfaces (E) are all the same (a=b=c), and the distance between the centers of the electrode pads (130, 140 / 131, 141) is variable (A>B, A=C).

[0275] However, the inclination angle of the blue LED 233 is opposite to the inclination angles of the adjacent red and green LEDs 210 and 220. At this time, the arrangement of the blue LED 233 is configured so that the intervals (a', b', c') between the light emitting surfaces (E) are all the same (a'=b'=c'), and the distance between the centers of the electrode pads (132, 142) is variable (A'>B', A'=C').

[0276] At this time, the distance (A', B', C') between the centers of the electrode pads (132, 142) of the blue LED 233 may become different from the distance (A, B, C) between the centers of the electrode pads (130, 140 / 131, 141) of the red and green LEDs (210, 220). At this time, in some cases, A may be equal to B'.

[0277] Fig.30 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a fifth embodiment of the present disclosure.

[0278] Reference Fig.30 , the arrangement of the blue LED 230 and Fig.15 However, the arrangement of the green and red LEDs (211, 221) is configured so that when the distance from the light emitting surface (E) becomes shorter, the inclination angle of the first type electrode (e.g., N-type electrode) and the second type electrode (e.g., P-type electrode) of the first LED 221 gradually shifts to the left.

[0279] In this case, in the arrangement of the blue LEDs 230, the intervals (a, b, c) between the light emitting surfaces (E) are all the same (a=b=c), and the distance between the centers of the electrode pads (132, 142) is variable (A>B, A=C).

[0280] However, the inclination angles of the red and green LEDs (211, 221) are opposite to the inclination angle of the adjacent blue LED 230. At this time, the arrangement of the red and green LEDs (211, 221) is configured so that the intervals (a', b', c') between the light emitting surfaces (E) are all the same (a'=b'=c'), and the distance between the centers of the electrode pads (130, 140 / 131, 141) is variable (A'>B', A'=C').

[0281] At this time, the distance (A', B', C') between the centers of the electrode pads (130, 140 / 131, 141) of the red and green LEDs (211, 221) may become different from the distance (A, B, C) between the centers of the electrode pads (132, 142) of the blue LED 230. At this time, in some cases, A may be equal to B'.

[0282] Fig.31 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a sixth embodiment of the present disclosure.

[0283] Reference Fig.31 , the arrangement of the green LED 220 is Fig.15 However, the arrangement of the red and blue LEDs (211, 233) is configured so that when the distance from the light emitting surface (E) becomes shorter, the first type electrode (e.g., N-type electrode) and the second type electrode (e.g., P-type electrode) of the first LED (211, 233) have an inclination angle that is gradually biased to the left.

[0284] In this case, in the arrangement of the green LED 220, the intervals (a, b, c) between the light emitting surfaces (E) are all the same (a=b=c), and the distance between the centers of the electrode pads (131, 141) is variable (A>B, A=C).

[0285] However, the inclination angles of the red and blue LEDs (211, 233) are opposite to the inclination angle of the adjacent blue LED 220. At this time, the arrangement of the red and blue LEDs (211, 233) is configured so that the intervals (a', b', c') between the light emitting surfaces (E) are all the same (a'=b'=c'), and the distance between the centers of the electrode pads (130, 140 / 132, 142) is variable (A'>B', A'=C').

[0286] At this time, the distance (A', B', C') between the centers of the electrode pads (130, 140 / 132, 142) of the red and blue LEDs (211, 233) may become different from the distance (A, B, C) between the centers of the electrode pads (131, 141) of the green LED 220. At this time, in some cases, A may be equal to B'.

[0287] Fig.32 2 is a schematic diagram showing a sub-pixel arrangement of a display device using semiconductor LEDs each having an inclined angle according to a seventh embodiment of the present disclosure.

[0288] Reference Fig.32 , the arrangement of the red LED 210 is Fig.15 However, the arrangement of the green and blue LEDs (221, 233) is configured so that when the distance from the light emitting surface (E) becomes shorter, the first type electrode (e.g., N-type electrode) and the second type electrode (e.g., P-type electrode) of the first LED (221, 233) have an inclination angle that is gradually biased to the left.

[0289] In this case, in the arrangement of the red LEDs 210, the intervals (a, b, c) between the light emitting surfaces (E) are all the same (a=b=c), and the distance between the centers of the electrode pads (130, 140) is variable (A>B, A=C).

[0290] However, the inclination angles of the green and blue LEDs (221, 233) are opposite to the inclination angle of the adjacent red LED 210. At this time, the arrangement of the green and blue LEDs (221, 233) is configured so that the intervals (a', b', c') between the light emitting surfaces (E) are all the same (a'=b'=c'), and the distance between the centers of the electrode pads (131, 141 / 132, 142) is variable (A'>B', A'=C').

[0291] At this time, the distance (A', B', C') between the centers of the electrode pads (131, 141 / 132, 142) of the green and blue LEDs (221, 233) may become different from the distance (A, B, C) between the centers of the electrode pads (130, 140) of the red LED 210. At this time, in some cases, A may be equal to B'.

[0292] In this way, when light emitting diodes (LEDs) are positioned symmetrically in pairs with adjacent pixels, the biased light distributions (a, b) generated by the crystal structure of the LEDs can cancel each other to achieve a uniform light distribution.

[0293] Therefore, when the display device is viewed from the outside, the problem that colors appear different depending on the viewing direction can also be solved.

[0294] At the same time, when the display device is viewed from the side, that is, even at this viewing angle, the distance (pitch) between the luminous centers (G) is constant, as shown by "D", and therefore, no brightness difference due to the light distribution characteristics is present.

[0295] In addition, according to various embodiments, various phenomena that may occur due to the tilt angle of the light emitting diode or the tilted light distribution pattern (V, V'), such as a phenomenon in which a dark area is visible, a phenomenon in which a vertical line is visible, and a light unevenness phenomenon, etc., can be effectively removed.

[0296] The above phenomenon indicates that after placing the cover film on the LED array, the slight difference in light intensity among red light, green light, and blue light is further reduced, and the light is uniformly emitted.

[0297] The above description is merely an illustration of the technical idea of ​​the present disclosure, and those skilled in the art to which the present disclosure belongs may make various modifications and changes without departing from the essential characteristics of the present disclosure.

[0298] Therefore, the embodiments disclosed in the present disclosure are not intended to limit the technical idea of ​​the present disclosure but are intended to describe it, and the scope of the technical idea of ​​the present disclosure is not limited to such embodiments.

[0299] The protection scope of the present disclosure should be interpreted by the accompanying claims, and all technical ideas within the equivalent scope thereof should be interpreted as being included in the scope of the present disclosure.

Claims

1. A display device using a light emitting diode, comprising: a wiring substrate in which a plurality of unit pixels are defined; at least one electrode pad disposed in each of the unit pixels to define a plurality of unit sub-pixels; as well as at least one light emitting diode configured to have an inclined angle and a bonding surface, a side surface of the light emitting diode being inclined toward one side at the inclined angle, and the bonding surface being electrically connected to the electrode pad; in, Two light emitting diodes adjacent to each other are arranged symmetrically with respect to the tilt angle; and A distance between two electrode pads adjacent to each other varies according to positions of the electrode pads.

2. The display device according to claim 1, wherein: The electrode polarities of the light emitting diodes connected to the adjacent two electrode pads are arranged such that the same polarities face each other.

3. The display device according to claim 1, wherein: The distance between the two adjacent electrode pads is changed by compensating for a displacement of the light emitting surface of the light emitting diode relative to the bonding surface caused by the tilt angle.

4. The display device according to claim 1, wherein: The distance between the two adjacent electrode pads varies in a direction in which light emitting diodes emitting light of the same color are arranged.

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

6. The display device according to claim 1, wherein: The distance between the two adjacent electrode pads includes: a first distance corresponding to an inclination angle at which the light emitting surfaces of the light emitting diodes move closer to each other; and The second distance corresponds to an inclination angle at which the light emitting surfaces of the light emitting diodes move away from each other.

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

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

9. The display device according to claim 6, wherein: The distances between the light emitting surfaces of the light emitting diodes corresponding to the first distance and the second distance are equal to each other.

10. The display device according to claim 6, wherein: Distances between bonding surfaces of the light emitting diodes corresponding to the first distance and the second distance are different from each other.

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