WO2022169164A1 - 마이크로 엘이디 선택적 공기층 전사 프린트 장치 - Google Patents
마이크로 엘이디 선택적 공기층 전사 프린트 장치 Download PDFInfo
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- WO2022169164A1 WO2022169164A1 PCT/KR2022/001245 KR2022001245W WO2022169164A1 WO 2022169164 A1 WO2022169164 A1 WO 2022169164A1 KR 2022001245 W KR2022001245 W KR 2022001245W WO 2022169164 A1 WO2022169164 A1 WO 2022169164A1
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- 238000010023 transfer printing Methods 0.000 title claims abstract description 27
- 239000000758 substrate Substances 0.000 claims abstract description 196
- 230000003028 elevating effect Effects 0.000 claims abstract description 61
- 239000011521 glass Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims description 24
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 238000012546 transfer Methods 0.000 description 22
- 230000008569 process Effects 0.000 description 14
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- 238000005516 engineering process Methods 0.000 description 6
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- FOXXZZGDIAQPQI-XKNYDFJKSA-N Asp-Pro-Ser-Ser Chemical compound OC(=O)C[C@H](N)C(=O)N1CCC[C@H]1C(=O)N[C@@H](CO)C(=O)N[C@@H](CO)C(O)=O FOXXZZGDIAQPQI-XKNYDFJKSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
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- HZXMRANICFIONG-UHFFFAOYSA-N gallium phosphide Chemical compound [Ga]#P HZXMRANICFIONG-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67144—Apparatus for mounting on conductive members, e.g. leadframes or conductors on insulating substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68764—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a movable susceptor, stage or support, others than those only rotating on their own vertical axis, e.g. susceptors on a rotating caroussel
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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
- H01L33/005—Processes
- H01L33/0093—Wafer bonding; Removal of the growth 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
- H01L33/005—Processes
- H01L33/0095—Post-treatment of devices, e.g. annealing, recrystallisation or short-circuit elimination
Definitions
- the present invention relates to a micro LED selective air layer transfer printing apparatus, and more specifically, a micro LED having a structure in which the wafer stage and the substrate stage constituting the micro LED selective air layer transfer printing apparatus can be precisely moved according to the working conditions. It relates to a selective air layer transfer printing apparatus.
- the demand for light emitting diodes has also increased as the use of indicator lights of electronic devices, numeric keypads of calculators, backlights of LED TVs, and various lighting devices has increased.
- the light emitting diode injects holes and electrons by applying a voltage to the P-N junction diode in the forward direction (positive for N type, negative for P type), and emits energy from the recombination as light. Also called LED (Light Emitting Diode), It is attracting attention in the application field of next-generation lighting equipment because of its high efficiency, long lifespan, and the ability to significantly reduce power consumption and maintenance costs.
- LED manufacturing uses III-V compound semiconductors such as gallium nitride (GaN), gallium phosphide (GaP), gallium arsenide (GaAs), and the like.
- III-V compound semiconductors have excellent metal stability and have a direct-transition type energy band structure.
- LED which is being studied a lot as a global issue recently, is not the existing optical device for large - area lamps at the cm2 level, but the technology to develop a micro-level LED chip with a light emitting area of 100 ⁇ m ⁇ 100 ⁇ m class is a hot topic. .
- the most necessary technology to use the micro LED chip as a cell of the light source is the technology to transfer the micro LED chip onto a transparent glass substrate that uses it as a display material.
- micro LED structure is grown on a wafer substrate and then the LED structure is transferred to a glass substrate using air gap print technology. skills are required
- An object of the present invention is to provide a micro LED selective air layer transfer printing apparatus having a structure that minimizes the change in the gap between the wafer substrate and the glass substrate generated when the wafer substrate and the glass substrate are moved during the micro LED chip transfer process.
- the present invention relates to a laser light source unit irradiating laser light, a wafer unit located under the laser light source unit to receive the laser light emitted from the laser light source unit, and a glass substrate located under the wafer unit to transfer the micro LED chip of the wafer unit.
- a micro LED selective air layer transfer printing apparatus comprising a part, wherein the glass substrate part includes a substrate stage positioned below the wafer part, and a substrate elevation part for raising and lowering the entire substrate stage or only a part of the substrate stage.
- the laser light source unit includes a laser light source for generating laser light, a barrel through which the laser light emitted from the laser light source passes, and a mask unit in which a non-transmissive layer is formed to partially block and selectively pass laser light passing through the barrel; , it may include a projection lens unit for enlarging the magnification of the laser light transmitted through the mask unit to fit the area of the wafer.
- the wafer part may include a wafer stage in which a laser light transmitting part through which the laser light passes, a wafer vacuum-adsorbed to a lower portion of the wafer stage, and a micro LED chip formed on a lower surface of the wafer.
- the glass substrate unit includes a substrate elevating support formed on the upper portion of the substrate elevating unit, a substrate left and right movement guide for guiding the substrate lifting and lowering support to move left and right, and a left and right substrate on which the substrate left and right movement guide is formed. It may further include a moving support, and a substrate forward and backward movement unit for guiding the substrate left and right movement support to move back and forth.
- the substrate elevating unit is formed in plurality, and each of the substrate elevating units includes a first driving unit, a first driving shaft of the first driving unit, a driving inclined member that is moved back and forth as the first driving shaft is rotated, and the driving inclination It may include a driven inclined member that is in contact with the member and is raised and lowered by the driving inclined member, and an elevation guide part formed to guide the elevation of the driven inclined member.
- the barrel unit includes an attenuator module configured to control power while passing the laser light, and a beam shape for forming a beam shape of the laser light passing through the attenuator module to reduce a difference in energy intensity generated depending on the position of the beam irradiation surface. and a field lens unit for reducing distortion of the laser light passing through the beam forming unit.
- the wafer unit may further include an additional elevating unit formed below the circumference of the wafer center hole of the wafer stage, a wafer adsorbing unit formed below the additional elevating/lowering unit, and a distance measuring sensor installed in the wafer adsorbing unit.
- a substrate rotating unit for rotating the substrate stage may be further formed between the lower portion of the substrate stage and the upper portion of the substrate lifting and lowering support.
- a stage support member for supporting the lower portion of the substrate stage may be further formed on the substrate elevating support.
- An inclined protrusion may be formed in the driving inclined member, and an inclined inlet groove into which the inclined protrusion is introduced may be formed in the driven inclined member.
- An elevating protrusion is formed on the rear surface of the driven inclined member, and an elevating groove into which the elevating protrusion is introduced may be formed in the elevating guide part.
- An elevation panel in contact with a lower portion of the substrate stage may be formed on an upper portion of the driven inclined member.
- the beam forming unit may include a first homogenization array unit, a second homogenization array unit spaced apart from the first homogenization array unit and formed side by side, and a capacitor lens unit spaced apart from the second homogenization array unit and formed side by side.
- the substrate rotating unit includes a rotation center circular pillar member formed in the center of the substrate lifting and lowering support, a rotation pillar member formed around the rotation center circular pillar member, and a substrate driven rotation member formed at one side of the substrate stage; , a substrate driving rotation member formed on an upper side of the substrate lifting and lowering support to rotate the substrate driven rotation member, and as the substrate driven rotation member moves by the substrate driving rotation member, the rotation center circular pillar member
- the rotating column member may be rotated about the center.
- the stage support member is formed to be movable in a direction perpendicular to a stage support cylinder portion, a first direction movement support portion formed under the stage support cylinder portion, and a first direction movement support portion below the first direction movement support portion. It may include a support for moving in the second direction.
- a first elastic member coupled to the elevating panel may be further formed, and an auxiliary elastic member may be formed between the first elastic member and the substrate elevating support.
- the substrate driving rotating member includes a rotation driving unit formed on an upper side of the substrate elevating support, a rotation driving shaft connected to the rotation driving unit, and a first direction moving member moving in a first direction according to the rotation of the rotation driving shaft; , a first direction guide member for guiding the movement of the first direction moving member, a second direction guide part formed on the first direction moving member, and perpendicular to the first direction along the second direction guide part It may include a second direction moving member formed to move in the formed second direction, and a cylindrical member inlet groove formed on an upper portion of the second direction moving member and into which the driven cylindrical member is introduced.
- the present invention has the effect of providing a micro LED selective air layer transfer printing apparatus having a structure that minimizes the change in the gap between the wafer and the glass substrate generated when the wafer and the glass substrate are moved during the micro LED chip transfer process.
- Fig. 1 (a) is a schematic side view showing an important part of the micro LED selective air layer transfer printing apparatus of the present invention
- Fig. 1 (b) is a schematic schematic diagram of optical system beam processing of the micro LED selective air layer transfer printing apparatus of the present invention
- Fig. Fig. 1(c) is a schematic diagram showing a beam passing through the optical system of the micro LED selective air layer transfer printing apparatus according to the present invention.
- FIG. 2 is a schematic front view showing a wafer
- FIG. 3 is a first conceptual diagram illustrating a process in which a micro LED chip is transferred.
- FIG. 4 is a second conceptual diagram illustrating a process in which a micro LED chip is transferred.
- FIG. 5 is a schematic front view showing the main part of the micro LED selective air layer transfer printing apparatus according to the present invention.
- FIG. 6 is a schematic exploded perspective view in which the substrate stage and the substrate elevating support are separated from FIG. 5 .
- Fig. 7(a) is a schematic perspective view illustrating a case where the substrate stage is raised/lowered by the deformation driving unit
- Fig. 7(b) is a schematic perspective view illustrating a case where the substrate stage is inclined by the deformation driving unit.
- Figure 8 (a) is a schematic perspective view of the wafer forward and backward movement passive member
- Figure 8 (b) is a schematic front view of the wafer forward and backward movement passive member.
- Fig. 1 (a) is a schematic side view showing an important part of the micro LED selective air layer transfer printing apparatus of the present invention
- Fig. 1 (b) is a schematic schematic diagram of optical system beam processing of the micro LED selective air layer transfer printing apparatus of the present invention
- Fig. Fig. 1 (c) is a schematic diagram showing a beam passing through the optical system of the micro LED selective air layer transfer printing apparatus according to the present invention
- Fig. 2 is a schematic front view showing the wafer.
- the present invention micro LED selective air layer transfer printing apparatus 100 includes a laser light source unit 120 for irradiating laser light, and a wafer unit located below the laser light source unit 120 to receive the laser light irradiated from the laser light source unit 120 . 140 and a glass substrate unit 160 positioned below the wafer unit 140 to which the micro LED chip 154 of the wafer unit 140 is transferred.
- the laser light source unit 120 includes a laser light source 122 that generates laser light, a barrel 132 through which the laser light emitted from the laser light source 122 passes, and a portion of the laser light passing through the barrel 132 .
- a custom mask unit 156 (Customer's mask) formed with a non-transmissive layer that blocks and selectively passes only a portion, and the laser light transmitted through the custom mask unit 156 is magnified to match the area of the wafer 152 . It includes a projection lens unit (Projection Lens) 161 to enlarge the.
- the laser light generated from the laser light source 122 various types of lasers such as excimer laser and DPSS laser may be used according to bandgap energy.
- the laser irradiation module may be an excimer laser having a wavelength of 157 nm to 350 nm.
- the wavelength of the laser light output from the laser irradiation module is in the ultraviolet wavelength range.
- An entrance window 123 (EW) formed between the laser light source 122 and the barrel 132 is further formed in the laser light source unit 120 , and the entrance window unit 123 is made of transparent glass. It transmits only ultraviolet (UV) light.
- UV ultraviolet
- the barrel 132 includes an attenuator module 126 formed to control power while the laser light passing through the entrance window 123 passes, and a beam shape of the laser light passing through the attenuator module 126 .
- a beam shaping unit 133 for forming the s from a Gaussian shape to a top hat shape, and a function of minimizing the distortion of the laser light passing through the beam forming unit 133 a first field lens unit 143, a slit mask 144 blocking a part of the laser light passing through the first field lens unit 143, and the slit mask unit
- a first mirror 146 for vertically moving the laser light passing through 144 , a second condenser lens unit 148 for collecting laser light reflected from the first mirror 146 , and the second capacitor
- a scanner unit 150 for controlling the laser light passing through the lens unit 148, and a second field lens unit 151 for minimizing distortion of the laser light passing through the scanner unit 150 and an exit window 155 formed at an exit through which the laser light passing through the second
- the attenuator module 126 is formed of an attenuator substrate 127 and a compensator substrate 128 .
- the attenuator substrate 127 functions to reduce the intensity of laser light without distorting the waveform
- the compensation substrate 128 functions to maintain the waveform of the laser light passing through the attenuator substrate 127 .
- the beam shaping unit 133 includes a first homogenizer array unit 134 and a second homogenizer array unit spaced apart from the first homogenizer array unit 134 by a predetermined distance and formed side by side. arrays) 138 , and first condenser lenses 141 spaced apart and formed side by side adjacent to the second homogenizing array unit 138 .
- Each of the first homogenization array unit 134 and the second homogenization array unit 138 is formed of a plurality of microlenses.
- the focal length of the 1-1 microlens 136-1 which is one of the plurality of first microlenses 136-1, 136-2, and 136-3 forming the first homogenization array unit 134, is f1.
- the distance between the first homogenization array unit 134 and the second homogenization array unit 138 is f2
- the focal length of the first condenser lens unit 141 is f3
- the 1-1 micro If the diameter of the lens 136 - 1 is d' and the diameter of the laser light formed at the focal length of the first condenser lens unit 141 is D', the following equation is established.
- the laser light passes through the first homogenization array unit 134 , the second homogenization array unit 138 , and the first condenser lens unit 141 , and forms a top hot laser beam in Gaussian Laser Beam shape processing. (Top hat Laser Beam shape) It is formed by processing.
- the Gaussian laser beam shape is a case in which energy intensity is different depending on the position of the beam irradiating surface, and the top hat laser beam shape is the beam irradiating surface. It is a beam shape that minimizes the difference in energy intensity that is generated depending on the location.
- the custom mask unit 156 is formed adjacent to the exit window 155 of the barrel 132 to block a portion of the laser light passing through the exit window 155 and allow only the remainder to pass therethrough.
- a second mirror 158 is formed adjacent to the custom mask unit 156 to vertically move the laser light passing through the custom mask unit 156, and is reflected by the second mirror 158.
- the laser light passes through the projection lens unit 161 and is sized.
- the wafer unit 140 includes a wafer stage 175 in which a laser light transmitting unit 152-1 through which laser light passes is formed, a wafer 152 vacuum-adsorbed to a lower portion of the wafer stage 175, and the and a micro LED chip 154 formed on the lower surface of the wafer 152 .
- micro LED chips 154 are arranged in units of blocks 155, and one block 155 is composed of a horizontal number ⁇ a vertical number of micro LED chips 154. have.
- the wafer 152 may include an R-wafer, a G-wafer, and a B-wafer, and in the present invention, an R-wafer is illustrated through FIG. 2 .
- an R-wafer is illustrated through FIG. 2 .
- a plurality of micro Red-LED chips are formed
- a plurality of micro Green-LED chips are formed
- a plurality of micro Blue-LED chips are formed.
- the glass substrate unit 160 includes a glass substrate 162 formed to be spaced apart from a lower portion of the micro LED chip 154 , and a substrate stage 164 on which the glass substrate 162 is vacuum-adsorbed.
- the distance a between the lower surface of the wafer stage 175 and the upper surface of the substrate stage 164 is 100 micrometers or less, and is spaced apart by a very narrow distance.
- the laser light source unit 120 is in a fixed state, and the laser passing through the projection lens unit 161 is irradiated to only a part of the entire plurality of micro LED chips 154 formed on the lower surface of the wafer 152 .
- FIG. 3 is a first conceptual diagram illustrating a process in which a micro LED chip is transferred
- FIG. 4 is a second conceptual diagram illustrating a process in which a micro LED chip is transferred.
- the arrows indicated in FIG. 3 are indicated according to the order in which the laser light is irradiated.
- the laser light is irradiated to an area at the same position in a fixed state, and the wafer stage 175 and the substrate stage 164 are irradiated in the direction opposite to the direction of the arrow. As it moves, the battle proceeds.
- the transfer of the micro LED chip 154 formed on the wafer 152 proceeds in the first area 1 of the wafer 152 as shown in FIG. 3 , and the laser light is applied to the position of the first area 1 .
- the second region 2 is moved to the position of the first region 1, and thereafter, transfer is performed, and the wafer stage 175 is again moved.
- the third region 3 is moved to the position of the existing first region 1 where laser light is irradiated, and the transfer proceeds. The same goes for the zones (5) and the sixth zone (6).
- the entire micro LED chip 154 formed on the wafer 152 is any one of three types of chips, red, green, and blue, the chips in one area are all transferred to the glass substrate 162 at once. Instead, only chips positioned at regular intervals among chips in one area are transferred by the action of the custom mask unit 156 .
- FIG. 4 similarly to the transfer process described with reference to FIG. 3 , the wafer stage 175 and the substrate stage 164 are simultaneously moved while the seventh region 7 is moved to the position of the existing first region 1 . Transfer is carried out through laser light, and then, as the wafer stage 175 and the substrate stage 164 are simultaneously moved, the eighth area 8 is moved to the existing first area 1 position, so that the transfer is performed through the laser light.
- This process proceeds through the ninth zone (9), the tenth zone (10), the eleventh zone (11) and the twelfth zone (12).
- the micro LED chip positioned under the wafer stage 175 ( The gap between 154) and the upper surface of the glass substrate 162 is narrower, and through the process of moving while maintaining such a narrow gap, the micro LED chip 154 and the glass substrate 162 come into contact with each other and a defect occurs. should be prevented
- FIG. 5 is a schematic front view showing the main part of the micro LED selective air layer transfer printing apparatus according to the present invention
- FIG. 6 is a schematic exploded perspective view in which the substrate stage and the substrate elevating support are separated in FIG. 5 .
- the present invention micro LED selective air layer transfer printing apparatus 100 includes a laser light source unit 120 , a wafer unit 140 , and a base 166 having a glass substrate unit 160 formed thereon.
- a custom mask unit 156 and a projection lens unit 161 are connected to the barrel 132 , and the projection lens unit 161 is positioned above the base 166 to be spaced apart.
- the glass substrate 160 includes a substrate elevating unit 176 for elevating the substrate stage 164 , a substrate elevating support 178 having the substrate elevating unit 176 formed thereon, and the substrate elevating unit 176 .
- the two substrate forward and backward moving parts 188 - 1 and 188 - 2 are located above the base 166 .
- a substrate rotating unit 442 for rotating the substrate stage 164 is formed adjacent to the substrate lifting unit 176 between the lower portion of the substrate stage 164 and the upper portion of the substrate lifting and lowering support 178 .
- the substrate rotation unit 442 includes a rotation center circular pillar member 444 formed in the center of the substrate elevating support 178 , and a rotation pillar member 446 formed around the rotation center circular pillar member 444 , and , a substrate driven rotation member 448 formed on one side of the substrate stage 164, and a substrate driving rotation member formed on an upper side of the substrate elevating support 178 to rotate the substrate driven rotation member 448 ( 450).
- the rotational pillar member 446 may be connected to the rotational center circular pillar member 444 by a bearing and the like to rotate around the rotational center circular pillar member 444 , and an upper portion of the rotational pillar member 446 is a substrate stage. It is coupled to the substrate stage 164 while being in contact with the circular groove 452 formed in the center of the lower surface of the 164 .
- the substrate driven rotating member 448 includes a driven bracket portion 453 formed on one side of the substrate stage 164 and a driven cylindrical member 454 connected to the driven bracket portion 453 .
- the substrate driving rotation member 450 includes a rotation driving unit 455 formed by a motor or the like on an upper side of the substrate elevating support 178 , a rotation driving shaft 456 connected to the rotation driving unit 455 , and the rotation A first direction moving member 458 that is connected to the driving shaft 456 by helical coupling, etc. and is moved in the first direction according to the rotation of the rotational driving shaft 456, and the first direction moving member 458 to guide the movement
- the first direction guide member 460 , the second direction guide part 462 formed on the upper portion of the first direction moving member 458 , and the second direction guide part 462 are perpendicular to the first direction A second direction moving member 464 formed to move in the second direction formed as (466).
- the rotation drive shaft 456 is rotated, the first direction moving member 458 and the second direction moving member 464 are moved, and the driven cylindrical member 454 is rotated at the same time.
- the substrate stage 164 is simultaneously rotated while the rotational pillar member 446 is rotated about the rotational center circular pillar member 444 .
- a plurality of substrate elevating units 176 formed in the same shape at three points of the substrate elevating support 178 include a first driving unit 468: 468-1, 468-2, 468-3, and the first As the first driving shaft 470 of the driving unit 468: 468-1, 468-2, 468-3 is coupled to the first driving shaft 470 by helical coupling or the like, the first driving shaft 470 is rotated.
- the first driving inclined member 472 moved forward and backward, and the first driven inclined member 474: 474-1, 474 raised and lowered by the first driving inclined member 472 in contact with the first driving inclined member 472 -2 and 474-3), and a first elevating guide portion 476: 476-1 formed to guide the elevating and lowering of the first driven inclined member 474: 474-1, 474-2, 474-3. , 476-2, 476-3).
- An inclined protrusion 478 is formed on the first driving inclined member 472, and the inclined protrusion 478 is introduced into the first driven inclined member 474: 474-1, 474-2, 474-3.
- the inclined inlet groove 480 is formed so that the inclined protrusion 478 is moved along the inclined inlet groove 480 so that the first driven inclined member 474 (474-1, 474-2, 474-3) is raised and lowered.
- An elevating protrusion 482 is formed on the rear surface of the first driven inclined member 474: 474-1, 474-2, 474-3, and the first elevating guide part 476: 476-1, 476- 2 and 476-3), an elevating groove 484 into which the elevating protrusion 482 is introduced is formed, and the elevating protrusion 482 enters the elevating groove 484, and the first driven inclination
- the member (474: 474-1, 474-2, 474-3) is connected to the first elevating guide part (476: 476-1, 476-2, 476-3) is stably elevating.
- the first elevating panel 486 (486-1, 486-2, 486) in contact with the lower portion of the substrate stage 164 is disposed on the first driven inclined member (474: 474-1, 474-2, 474-3). -3) is formed.
- a first elastic member 488 formed of a single leaf spring or the like commonly coupled to the three first elevating panels 486: 486-1, 486-2, 486-3 is formed, and the A plurality of auxiliary elastic members 490 formed in a bent elastic form are formed between the first elastic member 488 and the upper surface of the substrate elevating support 178 .
- the three first driven inclined members 474: 474-1, 474-2, 474-3 rises to raise the substrate stage 164 , and the first elastic member 488 also rises.
- the three first driven inclined members 474: 474-1, 474-2, 474-3 descends to lower the substrate stage 164 , and the first elastic member 488 also descends.
- the three first driven inclined members 474: 474 -1, 474-2, and 474-3 When only the 1-1 driving unit 468-1 of the three first driving units 468: 468-1, 468-2, and 468-3 is operated in one direction, the three first driven inclined members 474: 474 -1, 474-2, and 474-3), only the 1-1 driven inclined member 474-1 is raised while the substrate stage 164 is also raised only on one side where the 1-1 driven inclined member 474-1 is positioned.
- the first elastic member 488 is also elastically deformed on only one side on which the 1-1 driven inclined member 474-1 is positioned, and as a result, only a portion of the substrate stage 164 is increased in height to be finely adjusted.
- the three first driven inclined members 474 Among 474-1, 474-2, and 474-3), only the 1-1 driven inclination member 474-1 is lowered, and the substrate stage 164 is also positioned in which the 1-1 driven inclined member 474-1 is positioned. Only one side descends, the first elastic member 488 also has a restoring elastic force applied to only one side on which the 1-1 driven inclined member 474-1 is located, and the auxiliary elastic member 490 is the first elastic member 488 ) by reinforcing the restoring elastic force and acting to move it to the original position quickly.
- a stage support member 492 for supporting the lower portion of the substrate stage 164 is formed at four points among the upper surfaces of the substrate elevating support 178 .
- the stage support member 492 includes a stage support cylinder part 500 , a first direction movement support part 494 formed under the stage support cylinder part 500 , and a first direction movement support part 494 .
- a second direction movement support portion 496 formed to be movable in a direction perpendicular to the first direction movement support portion 494 is included in the lower portion.
- a first cylindrical rotating member 494-1 is formed between the lower part of the stage support cylinder part 500 and the upper part of the first direction movement support part 494, so that the stage support cylinder part 500 moves in the first direction. 494) is acted so as to move microscopically in the first direction.
- a second cylindrical rotating member 496-1 is formed between the lower portion of the first direction movement support part 494 and the upper portion of the second direction movement support part 496, so that the first direction movement support part 494 moves in the second direction.
- the upper portion of the support portion 496 acts to move finely in the second direction.
- the stage supporting member 492 When the substrate stage 164 is rotated by the substrate rotating unit 442 in a state where the stage supporting member 492 supports the lower portion of the substrate stage 164 , the stage supporting member 492 is also rotated in the first direction or It serves to support the substrate stage 164 without interfering with the rotation of the substrate stage 164 while being minutely moved in the second direction.
- stage support member 492 is installed on the periphery of the stage support cylinder part 500 and is formed by a stage support sensor part 498 formed by ultrasonic waves for measuring a distance and the stage support cylinder part 500 by the stage support cylinder part 500 . It further includes a stage support elevating unit 502 that is elevating.
- the stage support member 492 The stage support sensor unit 498 senses a distance spaced apart from the substrate stage 164 , the stage support cylinder unit 500 is operated, and the stage support elevation unit 502 is in close contact with the lower portion of the substrate stage 164 . rise until it becomes
- a tilting structure for elevating, rotating, and partially elevating and lowering the substrate stage 164 is formed, thereby enabling precise control of the substrate stage 164 .
- Fig. 7(a) is a schematic perspective view illustrating a case where the substrate stage is raised/lowered by the deformation driving unit
- Fig. 7(b) is a schematic perspective view illustrating a case where the substrate stage is inclined by the deformation driving unit.
- the structure in which the entire substrate stage 164 is raised or lowered above the substrate elevating support 178 or only one side is raised can be implemented by the deformation driving units 530 , 540 , and 550 .
- the deformation driving units 530 , 540 , and 550 may be formed at three points between the lower portion of the deformable substrate stage 164 - 3 and the upper portion of the deformable substrate elevating support 164 - 2 .
- the deformation driving units 530 , 540 , and 550 include a ball housing part 536 having an empty spherical space on the lower surface of the deformable substrate stage 164 - 3 , and a ball 534 introduced into the ball housing part 536 .
- -1) includes a cylinder portion 534 formed therein, and a hinge member 532 formed under the cylinder portion 534 .
- the cylinder part 534 is stretchable. And the ball 534 - 1 is rotatable inside the ball housing part 536 .
- the hinge member 532 is fixed to the upper surface of the deformable substrate elevating support 164-2.
- the deformation driving units 530 , 540 , and 550 are formed at three points, and when the three deformation driving units 530 , 540 , and 550 are all raised and lowered to have the same size, the deformable substrate stage 164 . -3) is raised and lowered in height based on the deformable substrate elevating support 164-2.
- Figure 8 (a) is a schematic perspective view of the wafer forward and backward movement passive member
- Figure 8 (b) is a schematic front view of the wafer forward and backward movement passive member.
- the wafer unit 140 includes an additional elevating unit 376 formed under the circumference of the wafer center hole 820 of the wafer stage 175, a wafer adsorption unit 810 formed under the additional elevating unit 376, and , installed on the lower surface of the wafer adsorption unit 810 and includes a first distance measuring sensor 527 and a second distance measuring sensor 528 using ultrasonic waves.
- a wafer 152 is pressed onto the wafer adsorption unit 810 , and a micro LED chip 154 is formed on a lower surface of the wafer 152 .
- the additional elevating unit 376 is formed at three points between the wafer stage 175 and the wafer suction unit 810 , and has a shape similar to that of the deformation driving units 530 , 540 , and 550 , so a detailed description thereof will be omitted.
- the first distance measuring sensor 527 and the second distance measuring sensor 528 emit ultrasonic waves toward the glass substrate 162 positioned below while being spaced apart from each other to face each other around the wafer 152, and reflect By measuring the arrival time of the ultrasonic wave, it is measured whether the distance between the wafer adsorption unit 810 and the glass substrate 162 is uniform.
- the present invention can determine whether the distance between the wafer adsorption unit 810 and the glass substrate 162 is maintained uniformly through the first distance measuring sensor 527 and the second distance measuring sensor 528, so that the micro LED chip transfer.
- the effect of providing the micro LED selective air layer transfer printing apparatus 100 having a structure that minimizes the change in the gap between the wafer 152 and the glass substrate 162 generated during the movement of the wafer 152 and the glass substrate 162 in the process is generated
- micro LED selective air layer transfer printing device 120 laser light source unit
- laser light source 132 barrel part
- custom mask unit 160 glass substrate unit
- substrate elevating unit 442 substrate rotating unit
- first direction moving member 464 second direction moving member
- first drive shaft 472 first drive inclined member
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Abstract
Description
Claims (9)
- 레이저 광을 조사하는 레이저 광원부와,상기 레이저 광원부에서 조사되는 레이저 광을 받도록 레이저 광원부의 하부에 위치되는 웨이퍼부와,상기 웨이퍼부의 하부에 위치되어 웨이퍼부의 마이크로 엘이디칩이 전사되는 글라스 기판부를 포함하며,상기 글라스 기판부는상기 웨이퍼부의 하부에 위치되는 기판 스테이지와,상기 기판 스테이지 전체를 승하강시키거나 일부분만 승하강시키는 기판 승하강부를 포함하는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 1에 있어서,상기 레이저 광원부는레이저 광을 발생시키는 레이저 광원과,상기 레이저 광원에서 발사된 레이저 광이 통과되는 경통부와,상기 경통부를 지난 레이저 광을 일부 차단하고 일부만 선별적으로 통과시키는 비투과층 막이 형성된 마스크부 및,상기 마스크부를 통과하여 전달되는 레이저 광을 웨이퍼의 면적에 맞게 배율을 확대하는 프로젝션 렌즈부를 포함하는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 1에 있어서,상기 글라스 기판부는상기 기판 승하강부가 상부에 형성되는 기판 승하강 지지대와,상기 기판 승하강 지지대가 좌우로 이동되도록 가이드하는 기판 좌우 이동 가이드부와,상기 기판 좌우 이동 가이드부가 상부에 형성되는 기판 좌우 이동 지지대와,상기 기판 좌우 이동 지지대가 전후 이동되도록 가이드하는 기판 전후 이동부를 더 포함하는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 1에 있어서,상기 기판 승하강부는 복수개로 형성되며,상기 기판 승하강부 각각은제1 구동부와,상기 제1 구동부의 제1 구동축과,상기 제1 구동축이 회전됨에 따라서 전후로 이동되는 구동 경사 부재와,상기 구동 경사 부재에 접하여 구동 경사 부재에 의해 승하강되는 피동 경사 부재와,상기 피동 경사 부재의 승하강을 가이드하도록 형성되는 승하강 가이드부를 포함하는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 2에 있어서,상기 경통부는상기 레이저 광이 통과되면서 파워가 조절되도록 형성된 감쇠기 모듈과,상기 감쇠기 모듈을 통과한 레이저 광의 빔 형태를 빔 조사면의 위치에 따라 발생되는 에너지 강도의 차이를 감소시키도록 형성하는 빔 형성부 및,상기 빔 형성부를 통과한 레이저 광의 왜곡을 감소시키는 필드 렌즈 유닛을 포함하는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 3에 있어서,상기 기판 스테이지의 하부와 기판 승하강 지지대의 상부 사이에는 기판 스테이지를 회전시키는 기판 회전부가 더 형성되는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 3에 있어서,상기 기판 승하강 지지대에 기판 스테이지의 하부를 지지하는 스테이지 지지부재가 더 형성되는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 6에 있어서,상기 기판 회전부는상기 기판 승하강 지지대의 중앙에 형성되는 회전 중심 원형 기둥 부재와,상기 회전 중심 원형 기둥 부재의 둘레에 형성되는 회전 기둥 부재와,상기 기판 스테이지의 일측에 형성되는 기판 피동 회전부재와,상기 기판 피동 회전부재를 회전시키도록 기판 승하강 지지대의 상부 일측에 형성되는 기판 구동 회전부재를 포함하며,상기 기판 구동 회전부재에 의해 기판 피동 회전부재가 이동함에 따라서 상기 회전 중심 원형 기둥 부재를 중심으로 회전 기둥 부재가 회전되는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
- 청구항 7에 있어서,상기 스테이지 지지부재는스테이지 지지 실린더부와,상기 스테이지 지지 실린더부의 하부에 형성되는 제1 방향 이동 지지부 및,상기 제1 방향 이동 지지부의 하부에 제1 방향 이동 지지부와 수직인 방향으로 이동가능하게 형성되는 제2 방향 이동 지지부를 포함하는 것을 특징으로 하는 마이크로 엘이디 선택적 공기층 전사 프린트 장치.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US18/273,890 US20240079516A1 (en) | 2021-02-04 | 2022-01-24 | Micro led selective air layer transfer printing device |
CN202280012726.XA CN116868322A (zh) | 2021-02-04 | 2022-01-24 | 微型led选择性空气层转印装置 |
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KR10-2021-0016333 | 2021-02-04 | ||
KR1020210016333A KR102486319B1 (ko) | 2021-02-04 | 2021-02-04 | 마이크로 엘이디 선택적 공기층 전사 프린트 장치 |
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KR (1) | KR102486319B1 (ko) |
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KR20180115584A (ko) * | 2017-04-13 | 2018-10-23 | 엘지전자 주식회사 | 엘이디칩 전사헤드 및 이를 포함하는 엘이디칩 전사장비 |
KR20200094498A (ko) * | 2019-01-30 | 2020-08-07 | 삼성전자주식회사 | 마스크를 포함하는 마이크로 엘이디 전사 장치 및 이를 이용한 마이크로 엘이디 전사 방법 |
KR20200107559A (ko) * | 2019-03-08 | 2020-09-16 | 한국광기술원 | Led 구조체 전사 장치 |
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JPH02202031A (ja) * | 1989-01-31 | 1990-08-10 | Nippon Seiko Kk | 回動テーブル装置 |
KR101160158B1 (ko) | 2010-05-28 | 2012-06-27 | 주식회사 엘티에스 | 레이저 리프트 오프 공정의 기판 분리장치 |
KR101605317B1 (ko) * | 2014-11-20 | 2016-03-23 | 한국기계연구원 | 광학식 선택적 전사 장치 및 방법 |
JP2018060993A (ja) * | 2016-09-29 | 2018-04-12 | 東レエンジニアリング株式会社 | 転写方法、実装方法、転写装置、及び実装装置 |
KR20190000058A (ko) * | 2017-06-22 | 2019-01-02 | 광주과학기술원 | 마이크로 소자의 이송 방법 |
-
2021
- 2021-02-04 KR KR1020210016333A patent/KR102486319B1/ko active IP Right Grant
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2022
- 2022-01-24 CN CN202280012726.XA patent/CN116868322A/zh active Pending
- 2022-01-24 WO PCT/KR2022/001245 patent/WO2022169164A1/ko active Application Filing
- 2022-01-24 US US18/273,890 patent/US20240079516A1/en active Pending
Patent Citations (5)
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JP2007232648A (ja) * | 2006-03-02 | 2007-09-13 | Sumitomo Heavy Ind Ltd | ステージ装置 |
KR20120069302A (ko) * | 2010-12-20 | 2012-06-28 | 디앤에이 주식회사 | 레이저 리프트 오프 장치 |
KR20180115584A (ko) * | 2017-04-13 | 2018-10-23 | 엘지전자 주식회사 | 엘이디칩 전사헤드 및 이를 포함하는 엘이디칩 전사장비 |
KR20200094498A (ko) * | 2019-01-30 | 2020-08-07 | 삼성전자주식회사 | 마스크를 포함하는 마이크로 엘이디 전사 장치 및 이를 이용한 마이크로 엘이디 전사 방법 |
KR20200107559A (ko) * | 2019-03-08 | 2020-09-16 | 한국광기술원 | Led 구조체 전사 장치 |
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KR102486319B1 (ko) | 2023-01-10 |
US20240079516A1 (en) | 2024-03-07 |
CN116868322A (zh) | 2023-10-10 |
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