WO2020197095A1 - 마이크로 발광다이오드 칩 제거 장치와 방법 및 이를 이용한 마이크로 발광다이오드 모듈 리페어 시스템과 방법 - Google Patents
마이크로 발광다이오드 칩 제거 장치와 방법 및 이를 이용한 마이크로 발광다이오드 모듈 리페어 시스템과 방법 Download PDFInfo
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- WO2020197095A1 WO2020197095A1 PCT/KR2020/002376 KR2020002376W WO2020197095A1 WO 2020197095 A1 WO2020197095 A1 WO 2020197095A1 KR 2020002376 W KR2020002376 W KR 2020002376W WO 2020197095 A1 WO2020197095 A1 WO 2020197095A1
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- micro led
- emitting diode
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- chip
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000008439 repair process Effects 0.000 claims abstract description 126
- 239000000758 substrate Substances 0.000 claims description 61
- 150000001875 compounds Chemical class 0.000 claims description 27
- 230000001678 irradiating effect Effects 0.000 claims description 27
- 239000004065 semiconductor Substances 0.000 claims description 27
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 12
- 230000002950 deficient Effects 0.000 abstract description 16
- 239000000463 material Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002679 ablation Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052594 sapphire Inorganic materials 0.000 description 4
- 239000010980 sapphire Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000011147 inorganic material Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004007 neuromodulation Effects 0.000 description 1
- -1 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000002861 polymer material Substances 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
-
- 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
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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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
-
- 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
- H01L21/67121—Apparatus for making assemblies not otherwise provided for, e.g. package constructions
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
-
- 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
Definitions
- the present invention relates to a system and method for repairing a micro LED module, and more particularly, to a system for repairing a micro LED module that replaces a micro LED chip for repair after removing a defective micro LED chip with a laser beam, and It's about how.
- Micro Light Emitting Diode is a next-generation future light source that can be applied not only to the ultra-high pixel self-luminous display field, but also to the next-generation communication technology field and cutting-edge medical fields such as neuromodulation technology.
- Micro light-emitting diode chips are light-emitting diodes with a size of several micrometers to tens of micrometers. After growing inorganic materials such as Al, Ga, N, P, As In on a sapphire substrate or silicon substrate, the sapphire substrate or silicon substrate is separated. It can be formed by doing. As described above, since the micro light-emitting diode chip has a very small size, it is transferred to a flexible substrate such as plastic, so that a flexible display device can be manufactured.
- micro light-emitting diodes are formed by growing inorganic materials, so the manufacturing process is simple and the yield is improved, and compared to organic light-emitting diodes made of organic light-emitting materials, the luminance is higher, lifespan is longer, and the cost It has the advantage of being low.
- the micro light-emitting diode chip has a very small size of several micrometers to several tens of micrometers, and thus a very precise mounting technique is required in order to modularize on a circuit board.
- About 25 million micro light-emitting diode chips are mounted to manufacture a 4K UHD-class display panel, and 2,500 repairs are required even if the yield is controlled at 99.99% (100 ppm).
- a technology capable of removing and remounting micro light emitting diode chips mounted at intervals of several micrometers to tens of micrometers is currently impossible to implement.
- micro LED module needs to mount tens to tens of millions of micro LED chips on a circuit board, a defective micro LED chip is generated no matter how much yield management is performed. Therefore, in order to commercialize micro light-emitting diodes, it is essential to develop a technology for repairing defective micro light-emitting diode chips in micro light-emitting diode modules.
- the present invention has been devised to solve this problem, and provides an apparatus, system and method for removing a defective micro LED chip in a micro LED module using a laser beam, and mounting a new micro LED chip at the removed position. I want to.
- an embodiment of the present invention provides a target micro LED chip in a micro LED module in which a plurality of micro light emitting diode (LED) chips are mounted on a circuit board.
- a device for removing comprising: a stage on which the micro LED module is mounted; And a laser irradiation unit for irradiating a laser beam onto the micro light-emitting diode module mounted on the stage.
- the laser irradiation unit removes the target micro LED chip by irradiating a laser beam onto a target micro LED chip among a plurality of micro LED chips mounted on the circuit board.
- the laser irradiation unit may irradiate a plurality of laser pulses.
- the laser irradiation unit may irradiate a top hat type laser beam onto the target micro LED chip.
- the micro LED chip may include at least one of a GaN-based compound semiconductor, an AlN-based compound semiconductor, and a GaAs-based compound semiconductor.
- the target micro LED chip may be removed by absorbing a laser beam irradiated from the laser irradiation unit.
- the laser irradiation unit may irradiate a laser beam having a wavelength of 900 nm or less.
- the laser irradiation unit may irradiate a laser beam having a pulse width of 30 ns or less.
- an embodiment of the present invention is a micro LED module repair system, the above-described micro LED chip removing device, and for repairing at the location where the target micro LED chip is removed. It includes a micro light emitting diode chip mounting apparatus for mounting a micro light emitting diode chip.
- an embodiment of the present invention is a system for repairing a micro light emitting diode module in which a plurality of micro light emitting diode (LED) chips are mounted on a circuit board, the A stage on which the micro light-emitting diode module is mounted; And a laser irradiation unit for irradiating a laser beam onto the micro light-emitting diode module mounted on the stage.
- the laser irradiation unit removes the target micro LED chip by irradiating a laser beam onto a target micro LED chip among the micro LED chips mounted on the circuit board.
- the repair system further includes a micro LED chip mounting unit for mounting a repair micro LED chip formed on a repair substrate at a location where the target micro LED chip is removed. Further, the laser irradiation unit separates the repair substrate by irradiating a laser beam onto the repair micro light emitting diode chip.
- the micro LED chip is formed on a device substrate, and the gap between the repair micro LED chips formed on the repair substrate is the device substrate It may be greater than the spacing between the micro light emitting diode chips formed in the.
- an embodiment of the present invention provides a target micro LED chip in a micro LED module in which a plurality of micro light emitting diode (LED) chips are mounted on a circuit board.
- LED micro light emitting diode
- the laser beam may be a top hat type laser beam.
- an embodiment of the present invention is a method of repairing a micro LED module in which a plurality of micro light emitting diode (LED) chips are mounted on a circuit board, Preparing a micro light emitting diode module in which the micro light emitting diode chip is determined; Removing the target micro LED chip by irradiating a laser beam onto the target micro LED chip; Mounting a repair micro LED chip formed on a repair substrate at a location where the target micro LED chip is removed; And separating the repair substrate by irradiating a laser beam onto the repair micro light emitting diode chip.
- LED micro light emitting diode
- FIG. 1 is a diagram schematically showing a micro light emitting diode chip formed on a device substrate.
- FIG. 2 is a schematic diagram of a micro light emitting diode module repair system according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of an apparatus for removing a micro LED chip according to an exemplary embodiment of the present invention.
- FIG. 4 is a diagram schematically illustrating an apparatus for removing a micro LED chip according to another embodiment of the present invention.
- FIG. 5 is a view for explaining a top hat type laser beam used in the present invention.
- FIG. 6 is a schematic diagram of a repair LED chip formed on a substrate for repair.
- FIG. 7 is a schematic diagram of a micro light emitting diode module repair system according to another embodiment of the present invention.
- FIG. 8 is a flowchart schematically illustrating a method of repairing a micro light emitting diode module according to an embodiment of the present invention.
- unit includes a unit realized by hardware, a unit realized by software, and a unit realized using both. Further, one unit may be realized using two or more hardware, or two or more units may be realized using one hardware.
- the present invention relates to a system and method for repairing a micro LED module, and more particularly, to a system for repairing a micro LED module that replaces a micro LED chip for repair after removing a defective micro LED chip with a laser beam, and It's about how.
- Micro light-emitting diodes are light-emitting diodes having a size of several micrometers to tens of micrometers, and are manufactured by growing inorganic materials such as Al, Ga, N, P, As In on a device substrate.
- a sapphire substrate or a silicon substrate may be used as the device substrate, and it is preferable to use a sapphire substrate in terms of yield and performance.
- a micro light-emitting diode chip grown on a device substrate and manufactured includes at least one of a GaN-based semiconductor compound, an AlN-based semiconductor compound, and a GaAs-based semiconductor compound.
- a micro light emitting diode chip formed on a device substrate is shown in FIG. 1.
- the micro LED chip 120 is separated from the device substrate 110, and only the micro LED chip 120 is transferred to the circuit board and mounted. Let it.
- Methods of mounting the micro LED chip 120 on a circuit board include a method of using an electrostatic head and a method of using an elastic polymer material (eg, poly(dimethylsiloxane) (PDMS)).
- an elastic polymer material eg, poly(dimethylsiloxane) (PDMS)
- micro LED module repair system that removes the defective micro LED chip from the manufactured micro LED module and replaces it with a new micro LED chip.
- FIG. 2 is a schematic diagram of a micro light emitting diode module repair system according to an embodiment of the present invention.
- a micro LED module repair system 200 includes a micro LED chip removing device 210 and a micro LED chip mounting device 250.
- the micro light emitting diode module repair system 200 may further include a control unit (not shown) having a memory.
- the control unit controls each component of the system 200 so that the system 200 operates.
- each component of the system 200 is described to directly perform an operation, but such description includes the control unit controlling each component such that each component performs a corresponding operation.
- the micro LED chip removal device 210 is a device for removing the target micro LED chip 122 from among a plurality of micro LED chips 120 mounted on the micro LED module, and includes a stage 220 and a laser irradiation unit. It has (230).
- the target micro LED chip 122 may be a defective micro LED chip, and the defective micro LED chip is detected using a separate inspection device after manufacturing a micro LED module by mounting a micro LED chip on a circuit board. Is determined.
- the number of target micro light emitting diode chips 122 may be plural.
- a micro light emitting diode module is mounted on the stage 220, and the stage 220 includes a means for holding the micro light emitting diode module.
- the micro light-emitting diode module includes a circuit board 110 and a micro light-emitting diode chip 120 mounted on the circuit board 110. As described above, the micro LED module mounted on the stage 220 is in a state in which the target micro LED chip 122 has been determined using an inspection device in advance.
- the laser irradiation unit 230 removes the target micro LED chip 122 by irradiating a laser beam onto a predetermined target micro LED chip 122 among the micro LED chips 120 mounted on the micro LED module. . At this time, the laser irradiation unit 230 may irradiate a plurality of laser pulses.
- FIGS. 3 and 4. 3 shows an example of a micro light emitting diode chip removing device 210 in which the laser irradiation unit 230 irradiates a laser beam at a fixed position and moves the stage 220, in the laser irradiation unit 230 After the irradiated laser beam is irradiated onto the target micro LED chip 122, the stage 220 is moved so that the laser beam can be irradiated onto the next target micro LED chip.
- FIG. 4 shows an example of a micro light emitting diode chip removal device 210 capable of irradiating a laser beam at different positions by the laser irradiation unit 230 while the stage 220 is fixed, at different positions
- the laser irradiation unit 230 is configured so that the laser beam is sequentially irradiated to the plurality of target micro light emitting diode chips 122 located therein.
- An example of the laser irradiation unit 230 provided in the micro LED chip removing apparatus 210 according to the present invention is a laser generator 310, a homogenizer unit 320, and a focusing lens as shown in FIG. A (focusing lens) 340 is provided.
- the laser generator 310 is a device that generates a laser beam.
- the micro LED chip removal apparatus 210 irradiates a laser beam onto the target micro LED chip 122, and the irradiated laser beam is absorbed by the target micro LED chip 122, so that the target micro LED chip (122) is ablation.
- the laser generator 310 generates a laser beam having a wavelength and a pulse width capable of removing the target micro light emitting diode chip 122.
- the wavelength of the laser beam generated by the laser generator 310 is preferably 900 nm or less, and the pulse width is preferably 30 ns or less.
- the micro light-emitting diode chip may include a GaN-based semiconductor compound, an AlN-based semiconductor compound, a GaAs-based semiconductor compound, and the like.
- the A laser generator 310 that generates a laser beam having a wavelength and a pulse width should be selected.
- a laser beam that can be absorbed by the target micro LED chip 122 In order to remove the target micro LED chip 122 by irradiating a laser beam, a laser beam that can be absorbed by the target micro LED chip 122 must be irradiated. Since the laser beam that can be absorbed by the target micro LED chip 122 is a laser beam having a wavelength smaller than a wavelength corresponding to the bandgap of the material forming the target micro LED chip 122, the laser generator 310 ) Is used to generate a laser beam having a wavelength smaller than the wavelength corresponding to the band gap of the material forming the target micro LED chip 122.
- the band gap of GaN is 3.3 eV and the wavelength corresponding to 3.3 eV is 376 nm, so the laser generator 310 is a laser beam having a wavelength less than 376 nm.
- the band gap of AlN is 5.34 ⁇ 5.71 eV, and the wavelength corresponding to 5.34 ⁇ 5.71 eV is 208 ⁇ 227 nm, so the laser generator 310 is smaller than 208 nm. It is used to generate a laser beam having a wavelength.
- the band gap of GaAs is 1.4 eV and the wavelength corresponding to 1.4 eV is 886 nm, so the laser generator 310 generates a laser beam having a wavelength less than 886 nm. Use what you generate.
- the homogenizer unit 320 includes a variable beam expander 322 and a homogenizer 324.
- variable beam expander 322 improves laser beam intensity uniformity by reducing the divergence angle of the laser beam generated by the laser generator 310 by an increased laser beam size ratio.
- the laser beam passing through the homogenizer 324 is focused by the focusing lens 340 and irradiated onto the target micro light emitting diode chip 122.
- the homogenizer 324 is for irradiating a top hat-shaped laser beam as shown in FIG. 5 to the target micro light emitting diode chip 122, and the laser beam passing through the homogenizer 324 is The intensity profile becomes a top hat type laser beam from the target micro light emitting diode 122.
- the micro LED chip removal apparatus 210 is for removing only the target micro LED chip 122, and does not damage other micro LED chips 120 around the target micro LED chip 122. Shouldn't. To this end, a top hat-shaped laser beam having a size similar to the size of the micro LED chip 120 is irradiated onto the target micro LED chip 122, or a top hat type having a size smaller than the size of the micro LED chip 120 The laser beam is irradiated to the target micro light-emitting diode chip 122 by scanning.
- the stage 220 is moved to remove the next target micro LED chip.
- FIG. 4 Another example of the laser irradiation unit 230 provided in the micro LED chip removing apparatus 210 according to the present invention is as shown in FIG. 4, a laser generator 410, a homogenizer unit 420, F- It has a Theta lens 440 and a beam scanner 450.
- the laser generator 410, the homogenizer unit 420, and the F-Theta lens 440 shown in FIG. 4 are the laser generator 310, the homogenizer unit 320, and the focusing lens shown and described in FIG. 3, respectively. Since it corresponds to 340, detailed descriptions of the laser generator 410, the homogenizer 420, and the F-Theta lens 440 shown in FIG. 4 will be omitted.
- the beam scanner 450 is a device that changes the position of the irradiated laser beam.
- the beam scanner 450 is arranged as shown in FIG. 4, several target micro light-emitting diode chips ( 122) can be sequentially irradiated with a laser beam. That is, when one target micro LED chip 122 is removed and the next target micro LED chip is to be removed, the next target micro LED chip can be removed through the beam scanner 450 without moving the stage 220. I can.
- the micro LED chip mounting apparatus 250 provided in the micro LED module repair system 200 uses the micro LED chip removal apparatus 210 A repair micro LED chip is mounted at the location where the micro LED chip 122 is removed. That is, the micro LED module repair system 200 according to the present invention removes the target micro LED chip 122 using a laser beam through the micro LED chip removal device 210, and the micro LED chip mounting device The repair micro LED chip is re-mounted in the empty position where the target micro LED chip 122 has been removed through 250.
- a repair micro LED chip used in the micro LED chip mounting apparatus 250 is formed on a repair substrate.
- Fig. 6 shows a repair micro light emitting diode chip formed on the repair substrate.
- the micro LED chip mounting apparatus 250 may mount the repair micro LED chip 620 at the location where the target micro LED chip 122 is removed by a pickup and place method.
- the repair micro LED chip 620 formed on the repair substrate 610 is a chip of the micro LED chip 120 formed on the device substrate 110 with a gap between the chip and the chip. It is formed to be larger than the gap between the chip and the chip (see FIG. 1).
- the repair substrate 610 may be about 250 ⁇ m.
- the micro LED chip is too small in size so that the gap between the chip and the chip of the micro LED chip 620 for repairing is the same as the gap between the chip and the chip of the micro LED chip 120 formed on the device substrate 110. In this case, it cannot be mounted using the pickup and place method.
- the gap between the chip and the chip of the repair micro LED chip 620 formed on the repair substrate 610 is the chip and the chip of the micro LED chip 120 formed on the device substrate 110. It is formed to be larger than the interval (see Fig. 1).
- the micro LED chip mounting apparatus 250 mounts the repair micro LED chip 620 and then separates and removes the repair substrate 610.
- the repair substrate 610 may be separated by irradiating a laser beam.
- the laser beam is irradiated onto the repair micro LED chip 620, a part of the repair micro LED chip 620 at the interface between the repair micro LED chip 620 and the repair substrate 610 is removed ( While ablation), the repair substrate 610 may be separated and removed.
- the micro LED chip mounting apparatus 250 separates the repair micro LED chip 620 formed on the repair substrate 610 with a large gap between the chip and the chip into individual chips through a laser scriber, and picks up After mounting the target micro LED chip at the location where the target micro LED chip has been removed in an &-place method, the repair substrate 610 is separated and removed from the repair micro LED chip 620 using a laser beam.
- FIG. 2 illustrates and describes a micro LED module repair system 200 in which a micro LED chip removing device 210 and a micro LED chip mounting device 250 are provided as separate devices.
- a micro LED module repair system that removes the target micro LED chip and replaces the repair micro LED chip at the removed location can be implemented in one device and is shown in FIG. 7.
- FIG. 7 is a schematic diagram of a micro light emitting diode module repair system according to another embodiment of the present invention.
- a micro LED module repair system 700 includes a target micro LED chip 122 among a plurality of micro LED chips 120 mounted on the micro LED module.
- the target micro LED chip 122 may be a defective micro LED chip, and the defective micro LED chip mounts the micro LED chip 120 on the circuit board 110 to manufacture a micro LED module, It is determined by detection using an inspection device.
- the number of target micro light emitting diode chips 122 may be plural.
- a micro light-emitting diode module is mounted on the stage 720, and the stage 720 has a means for holding the micro light-emitting diode module.
- the micro light-emitting diode module includes a circuit board 110 and a micro light-emitting diode chip 120 mounted on the circuit board 110. As described above, the micro LED module mounted on the stage 720 is in a state in which the target micro LED chip 122 is determined using an inspection device in advance.
- the laser irradiation unit 730 removes the target micro LED chip 122 by irradiating a laser beam onto a predetermined target micro LED chip 122 among the micro LED chips 120 mounted on the micro LED module. .
- the laser irradiation unit 730 may irradiate a plurality of laser pulses.
- the laser irradiation unit 730 may include a laser generator, a homogenizer unit, and a focusing lens, as illustrated and described in FIGS. 3 and 4.
- the laser irradiation unit 730 When the target micro LED chip 122 is removed using the laser irradiation unit 730, the laser irradiation unit 730 generates a laser beam having a wavelength and a pulse width at which the target micro LED chip 122 can be removed.
- the wavelength of the laser beam irradiated by the laser irradiation unit 730 is preferably 900 nm or less, and the pulse width is preferably 30 ns or less.
- the micro light-emitting diode chip may include a GaN-based semiconductor compound, an AlN-based semiconductor compound, a GaAs-based semiconductor compound, and the like.
- the A laser beam that generates a laser beam having a wavelength and a pulse width is selected, and the laser beam is irradiated onto the target micro light emitting diode chip 122.
- a laser beam that can be absorbed by the target micro LED chip 122 must be irradiated. Since the laser beam that can be absorbed by the target micro LED chip 122 is a laser beam having a wavelength smaller than the wavelength corresponding to the band gap of the material forming the target micro LED chip 122, the target micro LED chip 122 A laser beam having a wavelength smaller than the wavelength corresponding to the band gap of the material forming) is selected, and the laser beam is irradiated onto the target micro light emitting diode chip 122.
- the band gap of GaN is 3.3 eV and the wavelength corresponding to 3.3 eV is 376 nm, so a laser beam having a wavelength less than 376 nm is selected, and the laser The beam is irradiated onto the target micro light emitting diode chip 122.
- the band gap of AlN is 5.34 ⁇ 5.71 eV
- the wavelength corresponding to 5.34 ⁇ 5.71 eV is 208 ⁇ 227 nm
- a laser beam having a wavelength less than 208 nm is After selection, the laser beam is irradiated onto the target micro light-emitting diode chip 122.
- the band gap of GaAs is 1.4 eV and the wavelength corresponding to 1.4 eV is 886 nm, so a laser beam having a wavelength less than 886 nm is selected, and the laser beam Is irradiated onto the target micro light emitting diode chip 122.
- the laser irradiation unit 730 irradiates the target micro light emitting diode chip 122 with a top hat type laser beam as shown in FIG. 5 through a homogenizer unit.
- the micro LED module repair system 700 is for removing only the target micro LED chip 122 and does not damage other micro LED chips 120 around the target micro LED chip 122.
- a top hat-shaped laser beam having a size similar to the size of the micro LED chip 120 is irradiated to the target micro LED chip 122, or a top hat type having a size smaller than the size of the micro LED chip 120
- the laser beam is irradiated on the target micro light emitting diode chip 122 by scanning.
- the micro LED module repair system 700 includes a stage moving means for moving the stage 720 in order to irradiate the laser beam onto the plurality of target micro LED chips 122 (see FIG. 3), or
- the irradiation unit 730 may be equipped with a beam scanner (see FIG. 4).
- the micro light emitting diode chip mounting unit 750 mounts the repair micro light emitting diode chip 620 at the position where the target micro light emitting diode chip 122 is removed.
- the micro LED module repair system 700 is a stage moving means (not shown) to move the stage 720 to a position where the repair micro LED chip 620 is mounted as shown in the arrow shown in FIG. 7. It can be provided.
- the repair micro light emitting diode chip 620 used at this time is formed on the repair substrate 610 (see FIG. 6).
- the micro LED chip mounting unit 750 may mount the repair micro LED chip 620 at the location where the target micro LED chip 122 is removed by a pick-up and place method, and for this purpose, as described above.
- the spacing between the chips of the repair micro LED chip 620 formed on the repair substrate 610 (refer to FIG. 6) is between the chips of the micro LED chip 120 formed on the device substrate 110 and the chip. It is formed to be larger than the interval (see Fig. 1).
- the repair substrate is mounted using the laser irradiation unit 730. Separate and remove.
- the stage 720 may be moved downward of the laser irradiation unit 750 again as shown by the arrow shown in FIG. 7 by the stage moving means.
- the repair micro LED chip 620 at the interface portion between the repair micro LED chip 620 and the repair substrate 610
- the repair substrate 610 is separated and removed while a part of the is removed (ablation).
- the micro LED module repair system 700 removes the target micro LED chip 122 using a laser beam, and a repair formed on the repair substrate 610 with a large gap between the chip and the chip. After mounting the micro LED chip 620 for pickup and place at the location where the target micro LED chip 122 is removed, using a laser beam from the repair micro LED chip 620 610) is removed.
- FIG. 7 a location where the target micro LED chip 122 is removed and a location where the repair micro LED chip 620 is mounted are divided, and when the target micro LED chip 122 is removed and a repair micro LED chip 122 A case in which the stage 720 is moved when the chip 620 is mounted has been illustrated and described, but is not limited thereto. Since the location where the target micro LED chip 122 is removed and the location where the repair micro LED chip 620 is mounted are the same, the stage 720 is not moved after the target micro LED chip 122 is removed. It goes without saying that the case of mounting the repair micro light emitting diode chip 620 is also within the scope of the present invention.
- FIG. 8 is a flowchart illustrating a method of repairing a micro light-emitting diode module according to an embodiment of the present invention.
- the method of repairing a micro LED module according to the present invention may be performed using the micro LED module repair systems 200 and 700 shown in FIG. 2 or 7, but is not limited thereto.
- the target micro LED chip 122 is removed from the plurality of micro LED chips 120 mounted on the micro LED module.
- a micro LED module to be repaired is prepared (S810).
- the micro light emitting diode module to be repaired is a micro light emitting diode module in which the target micro light emitting diode chip 122 is determined, and the target micro light emitting diode chip 122 may be a defective micro light emitting diode chip.
- the defective micro LED chip is determined by mounting the micro LED chip 120 on the circuit board 110 to manufacture the micro LED module, and then detecting it using a separate inspection device.
- the number of target micro light emitting diode chips 122 may be plural.
- the micro light emitting diode module to be repaired is mounted on the stages 220 and 720 (S820), and then a laser beam is irradiated to the target micro light emitting diode chip 122, so that the target micro light emitting diode chip 122 is Remove (ablation) (S830).
- the target micro LED chip 122 can be removed by absorbing the laser beam, and for this purpose, a wavelength suitable for removing the target micro LED chip 122 (which is well absorbed by the target micro LED chip 122) and A laser beam having a pulse width is irradiated.
- the wavelength of the irradiated laser beam is preferably 900 nm or less, and the pulse width is preferably 30 ns or less.
- the micro light-emitting diode chip may include a GaN-based semiconductor compound, an AlN-based semiconductor compound, a GaAs-based semiconductor compound, and the like.
- the A laser beam that generates a laser beam having a wavelength and a pulse width is selected, and the laser beam is irradiated onto the target micro light emitting diode chip 122.
- a laser beam that can be absorbed by the target micro LED chip 122 must be irradiated. Since the laser beam that can be absorbed by the target micro LED chip 122 is a laser beam having a wavelength smaller than the wavelength corresponding to the band gap of the material forming the target micro LED chip 122, the target micro LED chip 122 A laser beam having a wavelength smaller than the wavelength corresponding to the band gap of the material forming) is selected, and the laser beam is irradiated onto the target micro light emitting diode chip 122.
- the band gap of GaN is 3.3 eV and the wavelength corresponding to 3.3 eV is 376 nm, so a laser beam having a wavelength less than 376 nm is selected, and the laser The beam is irradiated onto the target micro light emitting diode chip 122.
- the band gap of AlN is 5.34 ⁇ 5.71 eV
- the wavelength corresponding to 5.34 ⁇ 5.71 eV is 208 ⁇ 227 nm
- a laser beam having a wavelength less than 208 nm is After selection, the laser beam is irradiated onto the target micro light-emitting diode chip 122.
- the band gap of GaAs is 1.4 eV and the wavelength corresponding to 1.4 eV is 886 nm, so a laser beam having a wavelength less than 886 nm is selected, and the laser beam Is irradiated onto the target micro light emitting diode chip 122.
- the micro LED module repair method according to the present invention is for removing only the target micro LED chip 122, so as not to damage other micro LED chips 120 around the target micro LED chip 122.
- a top hat-shaped laser beam having a size similar to the size of the micro LED chip 120 is irradiated onto the target micro LED chip 122, or a top hat-shaped laser having a size smaller than the size of the micro LED chip 120 The beam is irradiated by scanning the target micro LED chip 122.
- the stages 220 and 720 are moved so that the laser beam is irradiated onto the corresponding target micro light-emitting diode chip (see FIG. 3), or the position to which the laser beam is irradiated using a beam scanner is changed (see FIG. 4). .
- the repair micro LED chip 620 is mounted at the position where the target micro LED chip 122 is removed (S850).
- the repair micro light emitting diode chip 620 is formed on the repair substrate 610 (see FIG. 6).
- the repair micro LED chip 620 is mounted at the location where the target micro LED chip 122 is removed by a pick-up and place method.
- the spacing between the chips of the repair micro LED chip 620 formed on the repair substrate 610 is determined by the chip of the micro LED chip 120 formed on the device substrate 110 and It is formed to be larger than the spacing between chips (see FIG. 1).
- the repair substrate is separated and removed by irradiating a laser beam onto the repair micro light emitting diode chip 620 (S860).
- a laser beam is irradiated onto the repair micro LED chip 620, a part of the repair micro LED chip 620 at the interface between the repair micro LED chip 620 and the repair substrate 610 is removed ( While ablation), the repair substrate 610 is separated and removed.
- the target micro LED chip 122 is removed using a laser beam, and the micro light emitting diode for repair is formed on the repair substrate 610 with a large gap between the chip and the chip.
- the repair substrate 610 is removed from the repair micro LED chip 620 using a laser beam. Separate and remove.
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Abstract
Description
Claims (13)
- 복수의 마이크로 발광다이오드(Light Emitting Diode, LED) 칩이 회로 기판 상에 실장된 마이크로 발광다이오드 모듈에서 타겟 마이크로 발광다이오드 칩을 제거하는 장치로,상기 마이크로 발광다이오드 모듈이 안착되는 스테이지; 및상기 스테이지에 안착된 마이크로 발광다이오드 모듈에 레이저 빔을 조사하는 레이저 조사 유닛;을 포함하며,상기 레이저 조사 유닛은,상기 회로 기판 상에 실장된 복수 개의 마이크로 발광다이오드 칩 중 타겟 마이크로 발광다이오드 칩에 레이저 빔을 조사하여 상기 타겟 마이크로 발광다이오드 칩을 제거하는,마이크로 발광다이오드 칩 제거 장치.
- 제 1 항에 있어서,상기 레이저 조사 유닛은 복수 개의 레이저 펄스를 조사하는,마이크로 발광다이오드 칩 제거 장치.
- 제 1 항 또는 제 2 항에 있어서,상기 레이저 조사 유닛은,탑햇(top hat) 형태의 레이저 빔을 상기 타겟 마이크로 발광다이오드 칩에 조사하는,마이크로 발광다이오드 칩 제거 장치.
- 제 1 항에 있어서,상기 마이크로 발광다이오드 칩은 GaN계 화합물 반도체, AlN계 화합물 반도체 및 GaAs계 화합물 반도체 중 적어도 하나를 포함하여 이루어진,마이크로 발광다이오드 칩 제거 장치.
- 제 1 항에 있어서,상기 타겟 마이크로 발광다이오드 칩은 상기 레이저 조사 유닛에서 조사된 레이저 빔을 흡수하여 제거되는,마이크로 발광다이오드 칩 제거 장치.
- 제 5 항에 있어서,상기 레이저 조사 유닛은 900 nm 이하의 파장을 갖는 레이저 빔을 조사하는,마이크로 발광다이오드 칩 제거 장치.
- 제 5 항에 있어서,상기 레이저 조사 유닛은 30 ns 이하의 펄스폭을 갖는 레이저 빔을 조사하는,마이크로 발광다이오드 칩 제거 장치.
- 제 1 항 내지 제 7 항 중 어느 한 항에 기재된 마이크로 발광다이오드 칩 제거 장치; 및상기 타겟 마이크로 발광다이오드 칩이 제거된 위치에 리페어용 마이크로 발광다이오드 칩을 실장시키는 마이크로 발광다이오드 칩 실장 장치;를 포함하는,마이크로 발광다이오드 모듈 리페어 시스템.
- 복수의 마이크로 발광다이오드(Light Emitting Diode, LED) 칩이 회로 기판 상에 실장된 마이크로 발광다이오드 모듈을 리페어하는 시스템으로,상기 마이크로 발광다이오드 모듈이 안착되는 스테이지; 및상기 스테이지에 안착된 마이크로 발광다이오드 모듈에 레이저 빔을 조사하는 레이저 조사 유닛;을 포함하며,상기 레이저 조사 유닛은, 상기 회로 기판 상에 실장된 마이크로 발광다이오드 칩 중 타겟 마이크로 발광다이오드 칩에 레이저 빔을 조사하여 상기 타겟 마이크로 발광다이오드 칩을 제거하고,상기 리페어 시스템은,상기 타겟 마이크로 발광다이오드 칩이 제거된 위치에 리페어용 기판에 형성된 리페어용 마이크로 발광다이오드 칩을 실장하는 마이크로 발광다이오드 칩 실장 유닛;을 더 포함하고,상기 레이저 조사 유닛은, 상기 리페어용 마이크로 발광다이오드 칩에 레이저 빔을 조사하여 상기 리페어용 기판을 분리하는,마이크로 발광다이오드 모듈 리페어 시스템.
- 제 9 항에 있어서,상기 마이크로 발광다이오드 칩은 디바이스 기판 상에 형성되고,상기 리페어용 기판에 형성된 리페어용 마이크로 발광다이오드 칩 사이의 간격이 상기 디바이스 기판에 형성된 마이크로 발광다이오드 칩 사이의 간격보다 더 큰,마이크로 발광다이오드 모듈 리페어 시스템.
- 복수의 마이크로 발광다이오드(Light Emitting Diode, LED) 칩이 회로 기판 상에 실장된 마이크로 발광다이오드 모듈에서 타겟 마이크로 발광다이오드 칩을 제거하는 방법으로,타겟 마이크로 발광다이오드 칩이 결정된 마이크로 발광다이오드 모듈을 준비하는 단계; 및상기 타겟 마이크로 발광다이오드 칩에 레이저 빔을 조사하여, 상기 타겟 마이크로 발광다이오드 칩을 제거하는 단계;를 포함하는,마이크로 발광다이오드 칩 제거 방법.
- 제 11 항에 있어서,상기 레이저 빔은 탑햇(top hat) 형태의 레이저 빔인 것인,마이크로 발광다이오드 칩 제거 방법.
- 복수의 마이크로 발광다이오드(Light Emitting Diode, LED) 칩이 회로 기판 상에 실장된 마이크로 발광다이오드 모듈을 리페어하는 방법으로,타겟 마이크로 발광다이오드 칩이 결정된 마이크로 발광다이오드 모듈을 준비하는 단계;상기 타겟 마이크로 발광다이오드 칩에 레이저 빔을 조사하여, 상기 타겟 마이크로 발광다이오드 칩을 제거하는 단계;상기 타겟 마이크로 발광다이오드 칩이 제거된 위치에 리페어용 기판에 형성된 리페어용 마이크로 발광다이오드 칩을 실장하는 단계; 및상기 리페어용 마이크로 발광다이오드 칩에 레이저 빔을 조사하여 상기 리페어용 기판을 분리하는 단계;를 포함하는,마이크로 발광다이오드 모듈 리페어 방법.
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KR102647400B1 (ko) * | 2021-09-09 | 2024-03-14 | 주식회사 이안하이텍 | 디스플레이 패널의 불량 마이크로 led를 리페어하는 장치 및 방법 |
KR102638010B1 (ko) | 2021-10-21 | 2024-02-20 | 엔젯 주식회사 | 마이크로 LED 디스플레이의 칩 리페어를 위한 픽앤플레이스(Pick-and-Place) 장치 |
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