WO2023075058A1 - 반도체 발광 소자를 이용한 디스플레이 장치 - Google Patents
반도체 발광 소자를 이용한 디스플레이 장치 Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/16—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular crystal structure or orientation, e.g. polycrystalline, amorphous or porous
- H01L33/18—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular crystal structure or orientation, e.g. polycrystalline, amorphous or porous within the light emitting region
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/20—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular shape, e.g. curved or truncated substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/20—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular shape, e.g. curved or truncated substrate
- H01L33/24—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular shape, e.g. curved or truncated substrate of the light emitting region, e.g. non-planar junction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/26—Materials of the light emitting region
- H01L33/30—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table
- H01L33/32—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table containing nitrogen
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/36—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/36—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the electrodes
- H01L33/38—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the electrodes with a particular shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
Definitions
- the present invention is applicable to a display device-related technical field, and relates to, for example, a display device using a micro LED (Light Emitting Diode).
- a micro LED Light Emitting Diode
- LCD Liquid Crystal Display
- OLED Organic Light Emitting Diodes
- LED Light Emitting Diode
- GaAsP compound semiconductors in 1962, along with GaP:N series green LEDs, It has been used as a light source for display images of electronic devices including information communication devices.
- LEDs light emitting diodes
- Sapphire which is used as a substrate on which a gallium nitride-based semiconductor is grown, has an inclined crystal plane.
- the R-plane has a crystal plane tilted along the m-axis.
- Ordinary sapphire can have an R-plane as a growth plane. Since the R-plane has an inclined surface with respect to the hexagonal prism 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 tilt angle.
- tilt angle may also be formed due to cutting in the direction of the crystal plane of the sapphire substrate after the light emitting device is formed of the gallium nitride-based semiconductor on the sapphire substrate.
- unintended parasitic capacitance may occur due to an electric field formed by a difference in polarity between the signal electrode and the common electrode of the light emitting device.
- the corresponding influence may be accumulated by the total number of light emitting elements used in the display device, and finally, a ghost phenomenon may appear in a unit of a display product.
- a technical problem to be solved by the present invention is to provide a display device using a semiconductor light emitting device that can offset biased light distribution of a light emitting device due to crystallinity of the light emitting device.
- an object of the present invention is to provide a display device using a semiconductor light emitting device that can solve the problem of different colors depending on the viewing direction when viewing the display device from the outside.
- a display device using a semiconductor light emitting device capable of correcting a color difference between left and right sides of a display by visually reinforcing an area of weak color when viewing a display from one direction is provided.
- the present invention provides a wiring substrate in which a plurality of unit pixel regions are defined; a wiring electrode including a first wiring electrode positioned in a first pixel area and a second wiring electrode positioned in a second pixel area on the wiring substrate; a first light emitting element electrically connected to the first wiring electrode; and a second light emitting element electrically connected to the second wire electrode, wherein the first light emitting element and the second light emitting element have side surfaces inclined to one side, and the first light emitting element and the second light emitting element have a tilt angle.
- the two light emitting elements may be symmetrically positioned with respect to the tilt angle.
- the first light emitting element and the second light emitting element may be positioned such that electrode positions are symmetrical to each other.
- each of the light emitting devices may include a first type electrode and a second type electrode, and may have an asymmetrical light distribution with respect to a direction connecting the first type electrode and the second type electrode.
- the asymmetrical light distribution may be offset by symmetrical positions of the first light emitting device and the second light emitting device.
- the first light emitting device and the second light emitting device may be symmetrically positioned with respect to a center between the first pixel area and the second pixel area.
- the first light emitting device and the second light emitting device may emit light of the same color.
- the first light emitting element and the second light emitting element may be repeatedly arranged in pairs.
- the tilt angle of the first light emitting device and the second light emitting device may be due to crystallinity of a semiconductor material of the light emitting device.
- the first light emitting device and the second light emitting device may have a cross section or a side surface of a parallelogram.
- the first light emitting device and the second light emitting device may have tilt angles that are farther apart or closer to each other.
- the present invention provides a wiring substrate in which a plurality of unit pixel regions are defined; a wiring electrode including a first wiring electrode positioned in a first pixel area and a second wiring electrode positioned in a second pixel area on the wiring substrate; a first light emitting element electrically connected to the first wiring electrode; and a second light emitting element electrically connected to the second wire electrode, wherein the first light emitting element and the second light emitting element include a first type electrode and a second type electrode, respectively, and the first type electrode and has an asymmetric light distribution with respect to a direction connecting the second type electrode, and the first light emitting element and the second light emitting element are positioned symmetrically with each other to cancel the asymmetric light distribution.
- a display device using a light emitting element is positioned symmetrically with each other to cancel the asymmetric light distribution.
- biased light distributions of light emitting elements resulting from crystallinity of light emitting elements can be offset with each other. That is, the asymmetric light distribution of the light emitting devices can be offset.
- parasitic capacitance generated from a difference in electrical polarity between light emitting elements can be reduced.
- an electric field generated from a difference in electrical polarity between light emitting elements can be canceled.
- a color difference between the left and right sides of the display may be corrected by visually reinforcing an area with weak color. Accordingly, an effect of enhancing a color viewing angle may be obtained in the final product stage of the display device.
- FIG. 1 is a schematic diagram of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram illustrating a specific example of subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram illustrating another specific example of subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 4 is a diagram schematically illustrating a subpixel arrangement of FIGS. 2 and 4 .
- FIG. 5 is a schematic diagram illustrating a subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 6 is a schematic diagram showing an effect of subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 7 is a schematic diagram illustrating a process of forming a subpixel arrangement according to FIG. 2 .
- FIG. 8 is a side view showing individual light emitting devices of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 9 is a schematic diagram illustrating tilt angles of individual light emitting devices of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 11 is a side view showing light emitting elements of a display device using a semiconductor light emitting element according to an embodiment of the present invention.
- FIG. 12 is a schematic diagram illustrating tilt angles of light emitting elements of a display device using a semiconductor light emitting element according to an embodiment of the present invention.
- FIG. 13 is a graph showing an example of light distribution of a light emitting device used in a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 14 is a graph showing another example of light distribution of a light emitting device used in a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 15 shows a uniform light distribution in which the biased light distributions shown in FIG. 13 or 14 cancel each other out.
- 16 to 19 are graphs illustrating a process in which light distribution gradually becomes symmetrical according to stacking steps in a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- the semiconductor light emitting device mentioned in this specification is a concept including an LED, a micro LED, and the like, and may be used interchangeably.
- FIG. 1 is a schematic diagram of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- an individual unit pixel area 101 is partitioned on a wiring board 100, and a plurality of light emitting devices 200 (200: 210, 220, 230) are provided in the unit pixel area 101. ) can be installed and configured.
- the individual light emitting devices 210, 220, and 230 installed in the unit pixel area 101 may substantially correspond to subpixels.
- three sub-pixels may be gathered to form one pixel.
- the three light emitting devices 210 , 220 , and 230 may correspond to red, green, and blue light emitting devices, respectively.
- Each of the light emitting devices 210, 220, and 230 may be electrically connected to a pair of electrode pads 130, 140/131, 141/132, and 142.
- the electrode pads 130, 131, and 132 (hereinafter referred to as first electrode pads) arranged in one direction in FIG. 1 may be connected to the first wiring electrodes 121, 122, and 123 (signal electrodes or data electrodes).
- the electrode pads 140 , 141 , and 142 arranged in the other direction may be connected to the second wire electrode 124 (common electrode or scan electrode).
- second electrode pads may be connected to the second wire electrode 124 (common electrode or scan electrode).
- the signal electrodes 121, 122, 123 and the common electrode 124 are omitted due to the arrangement of electrodes and pads.
- the first electrode pads 130 , 131 , and 132 may correspond to the signal electrodes 121 , 122 , and 123
- the second electrode pads 140 , 141 , and 142 may correspond to the common electrode 124 . may correspond to
- electrode pads and wiring electrodes are used interchangeably for description. That is, the electrode pad and the wire electrode can be described using the same reference numerals.
- a unit subpixel may be defined at a point where the first wire electrodes 121 , 122 , and 123 and the second wire electrode 124 cross each other.
- the first wiring electrodes 121, 122, and 123 are signal electrodes (or data electrodes)
- the first wiring electrodes 121, 122, and 123 or the first electrode pads 130, 131, and 132) may be connected to the TFT layer 120 having a thin film transistor (TFT). Accordingly, each of the light emitting devices 210, 220, and 230 may be driven by switching driving by the TFT layer 120.
- the TFT layer 120 is simply represented as a single layer, but the TFT layer 120 may include a plurality of TFT regions capable of performing a switching operation.
- each TFT region may be connected to a gate electrode, a source electrode, a drain electrode, an insulating layer disposed therebetween, and a first wire electrode 121, 122, 123 or the first electrode pad 130, 131, 132. Via electrodes and the like that may be included. A detailed description of this is omitted.
- Each of these TFT regions may be connected to each of the light emitting devices 210 , 220 , and 230 .
- a plurality of light emitting elements may be electrically connected to each other on the wiring electrodes 121, 122, 123, and 124 to form individual subpixels.
- the light emitting device 200 may include a red light emitting device 210, a green light emitting device 220, and a blue light emitting device 230, and these three light emitting devices 210, 220, and 230 ) may form individual subpixels and be repeatedly positioned on the wiring board 100 .
- the light emitting devices 210, 220, and 230 may include at least one of an organic light emitting device and an inorganic light emitting device.
- the light emitting devices 210 , 220 , and 230 may be inorganic semiconductor light emitting devices (Light Emitting Diodes; LEDs).
- the semiconductor light emitting device (LED) 200 may have a size of a micrometer ( ⁇ m) unit.
- the micrometer ( ⁇ m) size may mean that the width of at least one surface of the light emitting device 200 has a size of several to hundreds of micrometers ( ⁇ m).
- the TFT layer 120 may be positioned on the substrate 110 , and the insulating layer 150 may be coated on the TFT layer 120 .
- the insulating layer 150 covers 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 elements 210, 220, and 230. can do.
- the individual light emitting devices 210 , 220 , and 230 may be separated from each other by the barrier rib 160 .
- a cover layer 170 may be positioned on the light emitting devices 210 , 220 , and 230 and the barrier rib 160 .
- the light emitting devices 210 , 220 , and 230 may form individual subpixels and be repeatedly positioned on the wiring board 100 .
- each pixel area 101 may be repeatedly disposed on the wiring board 100 .
- the pixel area 101 may be repeatedly positioned along one data electrode 121 , 122 , 123 (first wire electrode) line or scan electrode 124 (second wire electrode) line in the length direction.
- a red light emitting device 210 , a green light emitting device 220 , and a blue light emitting device 230 may be repeatedly positioned along the left and right directions.
- a red light emitting element of a neighboring pixel area may be positioned to the right of the blue light emitting element 230 .
- the pixel area 102 having the same arrangement of the light emitting elements 210, 220, and 230 as the pixel area 101 in the adjacent data electrode (first wire electrode) line or scan electrode (second wire electrode) line; FIG. 8) may be located.
- light emitting elements having the same color may be located adjacent to each other in neighboring pixel areas.
- the red light emitting element 210, the green light emitting element 220, and the blue light emitting element 230 are repeatedly disposed along the data electrode (first wire electrode) line or the scan electrode (second wire electrode) line.
- light emitting elements having the same color may be repeatedly positioned in a direction perpendicular to the data electrode (first wire electrode) line or the scan electrode (second wire electrode) line.
- two adjacent light emitting devices may have different arrangements.
- a red light emitting device 210 and a green light emitting device 220 adjacent to the red light emitting device 210 may have different arrangements.
- a first type electrode for example, an N electrode
- the green light emitting device 220 may be positioned on the first wiring electrode 131.
- a second type electrode for example a P electrode, may be located.
- Such different arrangements may also be made between the green light emitting device 220 and the blue light emitting device 230 .
- the red light emitting element 210 and the green light emitting element 220 adjacent to the red light emitting element 210 may have a symmetrical arrangement with respect to electrode positions of the respective light emitting elements 210 and 220 .
- a light emitting element eg, red light emitting element 210 located in one pixel region 101 and a light emitting element (eg, red light emitting element 210) located in an adjacent pixel region 102 ) may have arrangements symmetrical to each other with respect to electrode positions.
- the first light emitting elements 210 located in the first pixel area 101 and installed in a first arrangement, and the second pixel area 102 adjacent to the first pixel area 101 Located in, the second light emitting element 210 installed in a second arrangement symmetrical to the first arrangement may be located.
- parasitic capacitance generated from a difference in electrical polarity between the first light emitting element and the second light emitting element may be reduced.
- an electric field generated from a difference in electrical polarity between the first light emitting element and the second light emitting element may be offset.
- the light emitting elements 210 having different arrangements and their effects will be described later in detail.
- FIG. 2 is a schematic diagram illustrating a specific example of subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 2 a state in which light emitting elements 230a, 230b, 230c, and 230d are installed in a symmetrical arrangement on a wiring board 100 is illustrated. This may correspond to a state in which the arrangement of the light emitting elements is parallel in one direction.
- the light emitting elements 230a, 230b, 230c, and 230d have an asymmetric light distribution (a, b; FIG. 5 and see FIG. 6). Also, each of the light emitting devices 230a, 230b, 230c, and 230d may have an asymmetric light distribution with respect to a direction connecting the first electrode pad 132 and the second electrode pad 142.
- the first light emitting device 230a and the third light emitting device 230c may have a light distribution (a) skewed to the left. This may correspond to the first arrangement.
- the second light emitting element 230b located between the first light emitting element 230a and the third light emitting element 230c and the fourth light emitting element 230d located on the right side of the third light emitting element 230c are on the right side. may have a light distribution (b) skewed to . This may correspond to the second arrangement.
- This may be a result of a material property of at least one of the substrate 231 and the semiconductor layer 232 .
- this phenomenon may occur because the crystal structure of at least one of the substrate 231 and the semiconductor layer 232 has an inclined shape.
- each of the light emitting devices 230a, 230b, 230c, and 230d has an inclined crystal structure.
- the first light emitting element 230a of one pixel and the second light emitting element 230b of the other pixel have a tilt symmetrical to each other can have an angle.
- the first light emitting element 230a and the second light emitting element 230b may form an inclined angle in a direction away from each other.
- the third light emitting element 230c and the fourth light emitting element 230d of the other pixel may have tilt angles symmetrical to each other.
- FIG. 3 is a schematic diagram illustrating another specific example of subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- FIG. 3 a state in which light emitting elements 230e, 230f, 230g, and 230h are installed in a symmetrical arrangement on the wiring board 100 is shown. This may correspond to a state in which the arrangement of the light emitting elements shown in FIG. 6 is connected in parallel.
- the light emitting elements 230e, 230f, 230g, and 230h have asymmetric light distributions (a, b) with respect to the direction connecting the first type electrode 235 and the second type electrode 237.
- each of the light emitting elements 230e, 230f, 230g, and 230h has an asymmetric light distribution (a, b) with respect to the direction connecting the first electrode pad 132 and the second electrode pad 142; FIG. 5 and FIG. 6).
- each of the light emitting devices 230e, 230f, 230g, and 230h has an inclined crystal structure.
- the fifth light emitting element 230e of one pixel and the sixth light emitting element 230f of the other pixel have symmetrical tilts can have an angle.
- the fifth light emitting element 230e and the sixth light emitting element 230f may form an inclined angle in a direction closer to each other.
- the seventh light emitting element 230g and the eighth light emitting element 230h of the other pixel may have tilt angles symmetrical to each other.
- FIG. 4 is a diagram schematically illustrating a subpixel arrangement of FIGS. 2 and 3 .
- FIG. 4(a) schematically illustrates a state in which a pair (pari) of the first light emitting element 230a and the second light emitting element 230b in the first region 230 of FIG. 2 forms an inclined angle in a direction away from each other. indicates That is, the distance between the first light emitting element 230a and the second light emitting element 230b may gradually increase from the lower surface of the first light emitting element 230a and the second light emitting element 230b to the upper surface.
- FIG. 4(b) shows a state in which a pair (pari) of the fifth light emitting element 230e and the sixth light emitting element 230f in the third region 232 of FIG. 10 forms an inclined angle in a direction in which they approach each other. is schematically represented. That is, the distance between the first light emitting element 230a and the second light emitting element 230b may gradually decrease from the lower surface of the first light emitting element 230a and the second light emitting element 230b to the upper surface.
- FIG. 5 is a schematic diagram illustrating a subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- a first light emitting element 230a and a second light emitting element 230b adjacent to each other are positioned in different arrangements, i.e., a first arrangement and a second arrangement.
- the second light emitting element 230b and the third light emitting element 230c may also be positioned with different arrangements.
- first light emitting device 230a and the third light emitting device 230c may be positioned in a first arrangement, and the first light emitting device 230a and the third light emitting device 230c may be positioned.
- the two light emitting elements 230b may be positioned in a second arrangement.
- the first light emitting device 230a, the second light emitting device 230b, and the third light emitting device 230c may all be light emitting devices emitting the same color.
- the first light emitting device 230a, the second light emitting device 230b, and the third light emitting device 230c may all be blue light emitting devices.
- the first arrangement may be an arrangement in which the N electrode 235 is positioned on the left side and the P electrode 237 is positioned on the right side in FIG. 5 .
- a semiconductor layer 232 is positioned on a substrate 231, and a first-type electrode contacting the semiconductor layer 232, for example, an N-type electrode 235 and A second type electrode, for example, a P type electrode 237 may be positioned.
- each of the light emitting devices 230a, 230b, and 230c may include a substrate 231, a semiconductor layer 232, a first type electrode 235, and a second type electrode 237.
- each of the light emitting devices 230a, 230b, and 230c may have a different arrangement with respect to a direction in which the first type electrode 235 and the second type electrode 237 are connected.
- each of the light emitting elements 230a, 230b, and 230c may have an asymmetric light distribution (a, b) with respect to a direction in which the first type electrode 235 and the second type electrode 237 are connected.
- the first light emitting device 230a and the third light emitting device 230c may have a light distribution (a) skewed to the left. This may correspond to the first arrangement.
- the second light emitting device 230b positioned between the first light emitting device 230a and the third light emitting device 230c may have a light distribution b biased to the right. This may correspond to the second arrangement.
- This may be a result of a material property of at least one of the substrate 231 and the semiconductor layer 232 .
- this 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 below.
- FIG. 6 is a schematic diagram showing an effect of subpixel arrangement of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- light emitting devices 230b and 230c may be installed on the wiring board 100 to form subpixels.
- the wiring board 100 includes a first wiring electrode 123 and a second wiring electrode arranged on the wiring board 100 as described above with reference to FIG. 1 .
- the light emitting elements 230b and 230c are located in the first pixel area and are adjacent to the first light emitting element 230b installed in a first arrangement and the first pixel area. It may be configured to include a second light emitting element 230c located in a second pixel area, and installed in a second arrangement symmetrical to the first arrangement.
- the first light emitting device 230b and the second light emitting device 230c may include a substrate 231 , a semiconductor layer 232 , a first type electrode 235 and a second type electrode 237 .
- the first light emitting element 230b and the second light emitting element 230c may have different arrangements in a direction in which the first type electrode 235 and the second type electrode 237 are connected.
- 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 may be combined together to form a light distribution (c) not biased towards the center. That is, the asymmetrical light distribution can be offset by the first arrangement of the first light emitting elements 230b and the second arrangement of the second light emitting elements 230c.
- the first light emitting device 230b and the second light emitting device 230c may be light emitting devices emitting the same color, eg, blue light emitting devices, located in adjacent pixel areas.
- the first arrangement of the first light emitting elements 230b and the second arrangement of the second light emitting elements 230c are configured symmetrically, when viewing the display from one direction, an area with weak color can be visually displayed. It is possible to compensate for the color difference of the display felt from the left/right side by reinforcing it. Accordingly, an effect of enhancing a color viewing angle may be obtained in a final product stage of a display device.
- FIG. 7 is a schematic diagram illustrating a process of forming a subpixel arrangement according to FIG. 2 .
- the light emitting elements 230a and 230c are first transferred to the electrode pads (#1, #3, etc.) of the odd rows of the wiring board, and then the position of the light emitting elements is rotated by 180 degrees, and then the even number of the light emitting elements on the wiring board.
- the light emitting elements 230b and 230d may be transferred to the electrode pads (#2, #4, etc.) of the columns.
- the light emitting devices 230a to 230d may be transferred to the transfer substrate 410 while being positioned on the wafer 500 and then transferred to the wiring substrate.
- the transfer substrate 410 may be, for example, a blue tape.
- the light emitting elements 230a and 230c may be transferred to the transfer substrate 410 in the same arrangement as in 1 above (a state in which the reference point M of the wafer 500 is located on the left side).
- the light emitting elements 230a and 230c transferred to the transfer substrate 410 may be transferred to electrode pads (#1, #3, etc.) of odd rows of the wiring substrate.
- the light emitting elements 230b and 230d are transferred to the transfer substrate 410 in a state in which the wafer 500 is rotated 180 degrees as shown in 2 below (a state in which the reference point M of the wafer 500 is located on the right side).
- the light emitting devices 230b and 230d transferred to the transfer substrate 410 may be transferred to electrode pads (#2, #4, etc.) of even rows of the wiring substrate.
- the light emitting devices 230a to 230h having arrangements as shown in FIGS. 2 to 4 may be transferred onto the wiring board.
- FIG. 8 is a side view showing individual light emitting devices of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- 9 is a schematic diagram showing tilt angles of individual light emitting devices of a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- 8 is an enlarged picture showing a side of the blue light emitting device 230 . 8 may show a sapphire substrate forming most of the thickness of the blue light emitting device 230 . As shown in FIG. 9 , the tilt angle ⁇ of the blue light emitting device 230 may be approximately 10 degrees. Also, as an example, the thickness t of the blue light emitting device 230 may be 80 ⁇ m.
- the gallium nitride semiconductor layer positioned on the sapphire substrate may also have the same or similar tilt angle.
- the sapphire substrate may be removed after the light emitting device is fabricated.
- the light emitting device may have a gallium nitride-based semiconductor layer, not the substrate, having the above tilt angle.
- the light emitting elements 210, 220, and 230 may have a cross section or side surface formed in a parallelogram shape.
- Sapphire can be used as a growth substrate for a light emitting device made of a gallium nitride-based semiconductor.
- sapphire has an inclined crystal plane.
- the R-plane has a crystal plane tilted along the m-axis.
- Ordinary sapphire can have an R-plane as a growth plane.
- the sapphire substrate and the gallium nitride-based semiconductor grown on the crystal plane of the sapphire substrate may have such an inclined tilt angle. .
- tilt angle may also be formed due to cutting in the direction of the crystal plane of the sapphire substrate after the light emitting device is formed of the gallium nitride-based semiconductor on the sapphire substrate.
- 11 is a side view showing light emitting elements of a display device using a semiconductor light emitting element according to an embodiment of the present invention.
- 12 is a schematic diagram showing tilt angles of light emitting elements of a display device using a semiconductor light emitting element according to an embodiment of the present invention.
- light emitting devices that may be used in displays may have various tilt angles.
- the light emitting device shown in FIGS. 11(A) and 12(A) may have a tilt angle of 5 degrees or less in one direction.
- the light emitting elements shown in FIGS. 11(B) and 12(B) may have a tilt angle of 12 degrees or less in a direction opposite to the tilt angle of the light emitting elements shown in FIGS. 11(A) and 12(A). there is.
- the light emitting elements shown in FIGS. 11(C) and 12(C) may have a tilt angle of 10 degrees or less in the same direction as the tilt angle of the light emitting elements shown in FIGS. 11(B) and 12(B). there is.
- the light emitting element has a parallelogram structure with a side section inclined to one side, and as described above, the light emitting device may have a light emitting pattern that is uneven and skewed to one side with respect to a direction perpendicular to the plane.
- 13 is a graph showing an example of light distribution of a light emitting device used in a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- 14 is a graph showing another example of light distribution of a light emitting device used in a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- 13 and 14 both show intensity measured along the long axis (x-axis) of the light emitting device. That is, the center of the long axis corresponds to 0 degree, and the luminous intensity is expressed on the left and right sides.
- FIG. 13 shows light distributions for red, green, and blue light emitting devices, respectively. As shown, it can be seen that an asymmetrical light distribution is shown to the left and right of the center.
- a light distribution having a greater luminous intensity is shown in the right portion A with respect to 0 degrees.
- a light distribution having a greater luminous intensity is shown in the right portion B with respect to 0 degrees.
- FIG. 15 shows a uniform light distribution in which the biased light distributions shown in FIG. 13 or 14 cancel each other out. That is, referring to FIG. 15 , it can be seen that the light distribution as shown in FIG. 13 is uniformed according to the arrangement of the light emitting devices described with reference to FIGS. 2 to 4 .
- FIGS. 16 to 19 are graphs illustrating a process in which light distribution gradually becomes symmetrical according to stacking steps in a display device using a semiconductor light emitting device according to an embodiment of the present invention.
- red, green, and blue lights, and spectrum division of white light mixed with these lights can be confirmed by FIG. 19 .
- FIG. 16 is a graph showing the light distribution (light distribution) of the light emitting device itself.
- the light distribution of the light emitting device may be substantially the same as the state of FIGS. 13 and 14 above.
- FIG. 16 shows light distributions for red, green, and blue light emitting devices, respectively. As shown, it can be seen that an asymmetrical light distribution is shown to the left and right of the center.
- FIG. 17 is a graph showing a state in which light emitting elements are transferred to a wiring board in a state in which they are arranged as described above. That is, in a state in which the light emitting elements are transferred to the wiring board 100 by the disposition as shown in FIGS. 2 and 3 , the light distribution of each light emitting element may show a state as shown in FIG. 17 .
- FIG. 18 shows a state in which a cover layer is coated on the installation surface of the wiring board on which the light emitting element is installed after the light emitting element is transferred onto the wiring board by the disposition shown in FIGS. 2 and 3 . That is, light distribution is shown in a state in which the cover layer 170 as shown in FIG. 1 is formed on the light emitting elements 210, 220, and 230.
- the intensity of red light is different from that of blue light or green light.
- the luminous intensity of the red light, green light, and blue light is substantially uniform after the cover layer is formed.
- a display device using a semiconductor light emitting device such as a micro LED.
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Abstract
Description
Claims (18)
- 다수의 단위 픽셀 영역이 정의된 배선 기판;상기 배선 기판 상에서 제1 픽셀 영역에 위치하는 제1 배선 전극과 제2 픽셀 영역에 위치하는 제2 배선 전극을 포함하는 배선 전극;상기 제1 배선 전극에 전기적으로 연결되는 제1 발광 소자; 및상기 제2 배선 전극에 전기적으로 연결되는 제2 발광 소자를 포함하고,상기 제1 발광 소자와 상기 제2 발광 소자는 측면이 일측으로 기울어진 틸트각을 가지고,상기 제1 발광 소자와 상기 제2 발광 소자는 상기 틸트각에 대하여 대칭적으로 위치하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제1항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 전극의 위치가 서로 대칭되도록 위치하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제2항에 있어서, 상기 각 발광 소자는 제1형 전극 및 제2형 전극을 포함하고, 상기 제1형 전극과 상기 제2형 전극을 연결하는 방향에 대하여 비대칭적인 광분포를 가지는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제3항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자의 대칭적인 위치에 의하여 상기 비대칭적인 광분포를 상쇄시키는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제1항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 상기 제1 픽셀 영역과 상기 제2 픽셀 영역 사이의 중심에 대하여 대칭적으로 위치하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제1항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 동일 색상의 광을 발광하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제1항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 서로 쌍을 이루어 반복적으로 배치되는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제1항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자의 틸트각은 상기 발광 소자의 반도체 물질의 결정성에 기인하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제1항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 단면 또는 측면이 평행사변형인 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제1항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 서로 멀어지는 틸트각 또는 서로 가까워지는 틸트각을 가지는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 다수의 단위 픽셀 영역이 정의된 배선 기판;상기 배선 기판 상에서 제1 픽셀 영역에 위치하는 제1 배선 전극과 제2 픽셀 영역에 위치하는 제2 배선 전극을 포함하는 배선 전극;상기 제1 배선 전극에 전기적으로 연결되는 제1 발광 소자; 및상기 제2 배선 전극에 전기적으로 연결되는 제2 발광 소자를 포함하고,상기 제1 발광 소자 및 상기 제2 발광 소자는 각각 제1형 전극 및 제2형 전극을 포함하고, 상기 제1형 전극과 상기 제2형 전극을 연결하는 방향에 대하여 비대칭적인 광분포를 가지고,상기 제1 발광 소자와 상기 제2 발광 소자는 상기 비대칭적인 광분포를 상쇄시키도록 서로 대칭적으로 위치하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제11항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 측면이 일측으로 기울어진 틸트각을 가지는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제12항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 상기 틸트각에 대하여 대칭적으로 위치하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제12항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자의 틸트각은 상기 발광 소자의 반도체 물질의 결정성에 기인하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제12항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 서로 멀어지는 틸트각 또는 서로 가까워지는 틸트각을 가지는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제11항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 상기 제1 픽셀 영역과 상기 제2 픽셀 영역 사이의 중심에 대하여 대칭적으로 위치하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제11항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 동일 색상의 광을 발광하는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
- 제11항에 있어서, 상기 제1 발광 소자와 상기 제2 발광 소자는 서로 쌍을 이루어 반복적으로 배치되는 것을 특징으로 하는 발광 소자를 이용한 디스플레이 장치.
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EP22887264.4A EP4425583A1 (en) | 2021-10-26 | 2022-06-02 | Display device using semiconductor light-emitting element |
KR1020247008051A KR20240046228A (ko) | 2021-10-26 | 2022-06-02 | 반도체 발광 소자를 이용한 디스플레이 장치 |
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- 2022-06-02 US US18/262,348 patent/US20240079386A1/en active Pending
- 2022-06-02 WO PCT/KR2022/007818 patent/WO2023075058A1/ko active Application Filing
- 2022-06-02 WO PCT/KR2022/007821 patent/WO2023075059A1/ko active Application Filing
- 2022-06-02 CN CN202280032883.7A patent/CN117242587A/zh active Pending
- 2022-06-02 KR KR1020247008051A patent/KR20240046228A/ko active Search and Examination
- 2022-06-02 EP EP22887265.1A patent/EP4425584A1/en active Pending
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KR20240046227A (ko) | 2024-04-08 |
US20240079387A1 (en) | 2024-03-07 |
KR20240046228A (ko) | 2024-04-08 |
CN117242587A (zh) | 2023-12-15 |
CN117015862A (zh) | 2023-11-07 |
WO2023075059A1 (ko) | 2023-05-04 |
US20240079386A1 (en) | 2024-03-07 |
EP4425583A1 (en) | 2024-09-04 |
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