WO2018030695A1 - 엘이디 모듈 및 그 제조방법 - Google Patents
엘이디 모듈 및 그 제조방법 Download PDFInfo
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- WO2018030695A1 WO2018030695A1 PCT/KR2017/008269 KR2017008269W WO2018030695A1 WO 2018030695 A1 WO2018030695 A1 WO 2018030695A1 KR 2017008269 W KR2017008269 W KR 2017008269W WO 2018030695 A1 WO2018030695 A1 WO 2018030695A1
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Definitions
- the present invention relates to an LED module and a method for manufacturing the same, and more particularly, to a method for manufacturing an LED module using transfer printing and flip bonding.
- each pixel is composed of a red LED, a green LED and a blue LED, or a red LED, a green LED, a blue LED, and a white LED.
- each of the red LED, the green LED, and the blue LED is fabricated in a package unit and mounted on a substrate.
- the LEDs constituting each pixel are separated from each other to obtain high quality resolution.
- an LED pixel unit having a red LED, a green LED, and a blue LED constituting one pixel in one package has been proposed.
- the spacing between the LEDs in one pixel that is, the spacing between the subpixels, is reduced, but it is difficult to reduce the interpixel spacing.
- interference of light may occur between red LEDs, green LEDs, and blue LEDs.
- the inventor of the present invention attempted to implement the LED display module by arranging groups including the red LED chip, the green LED chip, and the blue LED chip on the PCB substrate in a matrix array in order to reduce the inter-pixel spacing.
- LED chips having a micro size unit on the substrate it was difficult to mount LED chips having a micro size unit on the substrate to have a predetermined height and a predetermined distance.
- the height difference and / or gap difference of the LED chip mounted on the substrate lowers color reproducibility.
- wire bonding was required for electrical connection between the electrode pads on the substrate and the LED chip, which requires at least tens to hundreds of hours of work to make one product.
- the technique of transferring the LED chips arranged at an arbitrary position on the substrate elsewhere by using total transfer printing may be a solution to the problem of the prior art.
- transfer printing the flip-bonded LED chips arranged with the electrode pads facing down on the substrate eliminates the additional process such as wire bonding and prevents the array from being disturbed by the additional process. Can be.
- an object of the present invention is to transfer-printed onto a substrate from a chip holding portion that maintains a plurality of LED chips without disturbing in a predetermined arrangement, and then flip-bonds the plurality of LED chips onto a substrate to form an LED module. It is to provide an LED module manufacturing method for manufacturing.
- a chip-on carrier manufacturing a chip-on carrier including a chip holding unit having a horizontal adhesive surface and a plurality of LED chips with electrode pads adhered to the adhesive surface of the chip holding unit And a transfer printing process of transferring the plurality of LED chips in a predetermined arrangement from the chip holding portion to a substrate at another position, wherein the transfer printing process includes applying the transfer tape to light that weakens the adhesive force of the transfer tape. Firstly exposing the regions to form adhesive regions at predetermined intervals on the transfer tape; And pressing the transfer tape onto the LED chips on the chip holder to attach each of the LED chips to each of the adhesive regions of the transfer tape, while separating the electrode pads of the LED chip from the chip holder. And chip pick-up step.
- the first exposing step includes exposing light to the transfer tape through the light transmitting window using a photomask on which a plurality of light transmitting windows are formed.
- the method of manufacturing an LED module may include: a second exposure step of weakening the overall adhesive strength of the transfer tape to which the LED chips are attached after the chip pick-up step; and the substrate from the transfer tape of which the adhesive force is weakened as a whole. And a placing step of moving the plurality of LED chips.
- the chip pick-up step includes pressing the transfer tape against the LED chip adhered on the chip holding portion with a pick-up roller rolling in one direction.
- the step of placing the pressing the LED chip attached to the transfer tape with a placement roller on the substrate, so that the electrode pads of the LED chips are attached to a pair of bumps previously formed on the substrate involves doing.
- the adhesion of the transfer tape in the placement step is less than the adhesion by the adhesive previously raised on the bump pair.
- the chip-on carrier manufacturing process the step of preparing a chip holding portion having a horizontal adhesive surface; Preparing a plurality of LED chips; And attaching a chip to bond the plurality of LED chips onto the adhesive surface to form at least one LED chip array, wherein preparing the plurality of LED chips includes an n-type electrode pad and a p-type electrode pad below. Preparing a plurality of LED chips extended to the, and the step of attaching the chip includes bonding the n-type electrode pad and the p-type electrode pad directly to the adhesive surface.
- the attaching the chip may include the plurality of LEDs such that the pitch in the LED chip array on the chip holding portion is 1 / n times the pitch in the LED chip array transferred to the substrate by the transfer printing process.
- a chip is attached to the adhesive surface, where n is a natural number of at least one, and the pitch is the horizontal distance between one LED chip center and the other LED chip center in two neighboring LED chips.
- an LED module includes: a plurality of LED chips including an electrode pad on one side, a surface adhered to a transfer tape on the other side, and moved and arrayed from an external chip holding unit; And a substrate having a plurality of bumps that are flip-bonded with the electrode pads, wherein the transfer tape is divided into an exposed area and a non-exposed area by primary light irradiated from the outside to the other side of the LED chip. A region is picked up by adhering the LED chip to an adhesive region.
- the adhesive region of the transfer tape, the secondary light irradiated from the outside to the other side of the LED chip, the adhesive force is lowered, and is separated from the LED chip.
- the adhesive regions of the transfer tape are regions that are not exposed to the primary light irradiated from the outside to the other side of the LED chip using a photomask.
- the pick-up is to pick up the LED chip by rotating while pressing the transfer tape to the LED chip using a roller.
- the LED chip is aligned with a seating position on the substrate and then separated from the transfer tape through a pressure rotation of the roller.
- the chip holding portion includes a horizontal adhesive surface, and each of the electrode pads on one side of the plurality of LED chips are directly bonded to the chip holding portion extending downward.
- the plurality of LED chips all have the same height based on the adhesive surface of the chip holding portion.
- the pitch in the LED chip array on the chip holding portion is 1 / n times the pitch in the LED chip array transferred to the substrate, where n is a natural number of 1 or more, and the pitch is neighboring In two LED chips, this is the horizontal distance between the center of one LED chip and the center of another LED chip.
- the adhesion of the chip holding portion is less than the adhesion of the non-exposed area of the transfer tape and greater than the adhesion of the exposed area of the transfer tape.
- the plurality of LED chips arranged in the chip holding portion consists of only LED chips of any one type of red, green, or blue, all manufactured through the same one LED chip manufacturing process.
- the plurality of LED chips arranged in the chip holding portion includes a red LED chip, a green LED chip, and a blue LED chip.
- the chip holding part may be a film having flexibility.
- the precision of a plurality of LED chips on a substrate is obtained by using a transfer printing method that selects all or a portion of the plurality of LED chips that are pre-arranged at arbitrary positions and arranges them in a desired arrangement on a target substrate. Aligned LED modules can be manufactured.
- FIG. 1 is a flowchart illustrating a method of manufacturing an LED module according to an embodiment of the present invention.
- FIG. 2 is a view for explaining the transfer printing process in the LED module manufacturing method according to an embodiment of the present invention.
- FIG 3 is a view illustrating a chip-on carrier manufacturing process including a blue LED chip in the LED module manufacturing method according to an embodiment of the present invention.
- FIG. 4 is a view illustrating a chip-on carrier manufacturing process including a green LED chip in the LED module manufacturing method according to an embodiment of the present invention.
- FIG. 5 is a view for explaining a chip-on carrier manufacturing process including a red LED chip in the LED module manufacturing method according to an embodiment of the present invention.
- FIG. 6 is a diagram for describing a chip-on carrier manufacturing process including a red LED chip, a green LED chip, and a blue LED chip according to an alternative example.
- FIG. 7 is a plan view illustrating a substrate of a display module and an array of electrode patterns formed by a matrix array formed on the substrate according to another embodiment of the present invention.
- FIG. 8 is a plan view illustrating a display module including LED chip groups arranged in a matrix array on the electrode patterns illustrated in FIG. 7.
- FIG. 9 is a cross-sectional view for describing the LED chip group illustrated in FIG. 8.
- FIG. 10 is a plan view illustrating an alternative example of the LED module illustrated in FIGS. 7 to 9.
- FIG. 11 is a view for signing a manufacturing method of the LED module illustrated in FIGS. 7 to 10.
- FIG. 12 is a diagram for describing a method of transferring and printing LED chips onto a substrate for manufacturing the LED module illustrated in FIGS. 7 to 10.
- FIG. 13 is a flowchart illustrating a method of manufacturing an LED module using selective transcription printing according to another embodiment of the present invention.
- FIG. 14 is a view for explaining a chip pick-up step in the LED module manufacturing method shown in FIG.
- FIG. 15 is an enlarged view of circle “A” of FIG. 14.
- 16 is a view for explaining a step of weakening the adhesive force of the carrier tape immediately before the chip moving step and the chip placing in the LED module manufacturing method shown in FIG.
- FIG. 17 is a diagram illustrating a chip placing step in the LED module manufacturing method of FIG. 16.
- FIG. 18 is a view for explaining the circle “B” in FIG. 17.
- 19 is a diagram for explaining an LED chip pick-up operation by front-side transfer.
- 20A and 20B are diagrams for explaining various examples of the LED chip pick-up operation by selective transfer.
- the adhesive force of the transfer tape 3 which has undergone the second UV exposure step S23 is less than the adhesive force previously applied on the substrate 5, more specifically to the bump pairs 5a, 5b.
- the placement roller 270 rotates to push the LED chips 1 attached to the transfer tape 3 onto the substrate 5, more specifically to the bump pairs 5a and 5b on the substrate 5.
- the placement roller 270 is provided with a flexible blanket on the outer circumferential side of the roller body coupled with the shaft, to better place down the LED chip 1 through the rolling rotation, and also to press the rolling rotation It also prevents damage to the LED chip (1) by.
- the second stage 290 may be raised to help pressurization by the placement roller 270.
- a peeling step s25 is performed to remove the transfer tape 3 from the LED chip 1, and then the LED chips 1 placed down on the substrate 5 are subjected to a subsequent reflow soldering process. By bonding on the substrate.
- a chip-on carrier fabrication process including a blue LED chip 1B is grown on a sapphire substrate 10B and the sapphire substrate 10B, and is an n-type semiconductor layer 12B, an active layer 13B, and a p-type.
- the LED wafer WB in units of light emitting cells CB, 10B, the wafer layers 12B, 13B, and 14B on the sapphire substrate 10B, and the p-type electrode pads 142B formed on the wafer layers 12B, 13B, and 14B opposite the sapphire substrate 10B, and A chip dividing step (S14-B) for manufacturing a plurality of blue LED chips 1B including an n-type electrode pad 122B, and a plurality of blue LED chips 1B for a p-type electrode pad 142B and an n-type
- the chip attaching step (S15-B) is performed such that the electrode pads 122B are turned upside down and attached on the chip holding part 2 having the adhesive force, and the plurality of blue LED chips 1B form a matrix arrangement. Include.
- the adhesive force of the chip holding part 2 is smaller than the adhesive force of the transfer tape 3 before the UV exposure and the adhesive force of the transfer tape 3 after the UV exposure.
- the epitaxial layer is grown so that the active layer 13B includes the InxGa (1-x) N well layer, but the amount of In is appropriately adjusted to obtain the blue LED chip 1B. .
- the wafer patterning step (S12-B) a plurality of row and valley columns in the epitaxial layer are etched to form an n-type semiconductor layer on the sapphire substrate 10B or the lattice matching layer 11B thereon. 12B, a plurality of light emitting cells CB including an active layer 13B and a p-type semiconductor layer 14B are first formed, and then the p-type semiconductor layer 14B and the active layer of each light emitting cell CB are formed.
- the pad forming step S13-B is partially etched away to expose n-type semiconductor layer 12B.
- the p-type electrode pad 142B is formed in the exposed region of the p-type semiconductor layer 14B
- the n-type electrode pad 122B is formed in the exposed region of the n-type semiconductor layer 12B.
- the n-type electrode pad is formed to a thickness that compensates for the above-described step, so that the distance from the bottom surface of the sapphire substrate 10B to the top surface of the n-type electrode pad 122B is the same as the distance from the top surface of the p-type electrode pad 142B.
- 122B and the p-type electrode pad 142B are formed.
- the blue LED wafer WB is divided into light emitting cells CB by using a cutting tool T or a laser such as a blade or a saw.
- a plurality of blue LED chips 1B are produced.
- the n-type electrode pad 122B and the p-type electrode pad 142B face upwards and the sapphire substrate 10B faces downward.
- the chip attaching step (S15-B) the plurality of blue LED chips 1B are turned upside down, and the n-type electrode pad 122B and the p-type electrode pad 142B are adhered to the horizontal bonding surface of the chip holding part 2B.
- a number of blue LED chips 1B are attached on the chip holding portion 2B.
- the top surface of the LED chips 1 becomes the base surface of the sapphire substrate 10B, and the height of all the blue LED chips 1B is constant based on the adhesive surface of the chip holding part 2B.
- All of the blue LED chips 1B of the chip-on carrier thus manufactured are arranged to form a plurality of row arrays or column arrays on the chip holding part 2B.
- the chip holding portion 2B is preferably a chip holding film having flexibility and having a horizontal adhesive surface.
- the chip-to-chip pitch P of the blue LED chips 1B in a particular single-row array held on the horizontal adhesive surface of the chip holding portion 2B is blue in the single-row array arrayed on the substrate by the above-described transfer printing. It is determined as 1 / n of the pitch between chips of LED chips, where n is a natural number of 1 or more. In the present specification, the pitch between chips is defined as a horizontal distance between one LED chip center and another LED chip center in two adjacent LED chips.
- a chip-on carrier fabrication process including a green LED chip 1G is grown on a sapphire substrate 10G and the sapphire substrate 10G, and has an n-type semiconductor layer 12G, an active layer 13G, and a p-type.
- the LED wafer WG in units of light emitting cells CG, 10G, the wafer layers 12G, 13G, and 14G on the sapphire substrate 10G, and the p-type electrode pads 142G formed on the wafer layers 12G, 13G, and 14G opposite the sapphire substrate 10G, and A chip dividing step (S14-G) for manufacturing a plurality of green LED chips 1G including an n-type electrode pad 122G, and a plurality of green LED chips 1G, a p-type electrode pad 142B and an n-type
- the chip attaching step (S15-G) is carried out so that the electrode pad 122B is turned upside down and attached on the chip holding part 2 having the adhesive force, and the plurality of green LED chips 1G form a matrix arrangement. Include.
- the epitaxial layer is grown so that the active layer 13G includes the InxGa (1-x) N well layer, but the above-described blue LED chip is manufactured to obtain the green LED chip 1G. Compare the composition with In.
- a plurality of row valleys and a plurality of column valleys are etched on the epitaxial layer to etch the n-type semiconductor layer over the sapphire substrate 10G or the lattice matching layer 11G thereon.
- the p-type electrode pad 142G is formed in the exposed region of the p-type semiconductor layer 14G, and the n-type electrode pad 122G is formed in the exposed region of the n-type semiconductor layer 12G.
- the n-type electrode pad is formed to a thickness that compensates for the above-described step, so that the distance from the bottom surface of the sapphire substrate 10G to the top surface of the n-type electrode pad 122G and the top surface of the p-type electrode pad 142G are the same.
- 122G and the p-type electrode pad 142G are formed.
- the chip dividing step S14 -G divides the LED wafer WG into the light emitting cells CG by using a cutting tool T or a laser such as a blade or a saw, for example, a plurality of green LED chips 1G. ).
- a cutting tool T or a laser such as a blade or a saw
- the n-type electrode pad 122G and the p-type electrode pad 142G face upward and the sapphire substrate 10G faces downward.
- the chip attaching step (S15-G) the plurality of green LED chips 1G are turned upside down, and the n-type electrode pad 122G and the p-type electrode pad 142G are adhered to the horizontal adhesive surface of the chip holding part 2G.
- a plurality of green LED chips 1G are attached on the chip holding portion 2G.
- the top surface of the green LED chips 1G becomes the base surface of the sapphire substrate 10G, and the height of all the green LED chips 1G is constant based on the adhesive surface of the chip holding unit 2G.
- All of the green LED chips 1G of the chip-on carrier manufactured as described above are arranged to form a plurality of row arrays or column arrays on the chip holding unit 2G.
- the chip holding portion 2G is preferably a chip holding film having flexibility and having a horizontal adhesive surface.
- the chip-to-chip pitches P of the green LED chips 1G in a specific single row array held on the horizontal adhesive surface of the chip holding unit 2G are blue in a single row array arrayed on a substrate by the above-described transfer printing. It is determined as 1 / n of the pitch between chips of LED chips, where n is a natural number of 1 or more.
- a chip-on carrier fabrication process including a red LED chip is bonded on a sapphire substrate 10R and the sapphire substrate 10R, and a p-type semiconductor layer 12R, an active layer 13R, and an n-type semiconductor layer.
- n-type electrode pad 142R connected to the n-type semiconductor layer 14R is formed on the 14R, and the second region a2 is electrically separated from the n-type semiconductor layer 14R by the insulating layer R.
- an n-type semiconductor layer 14R including an n-AlGaInP layer and an n-cladding layer on a GaAs substrate GS, an active layer 13R including an MQW, p- cladding layer and the p-GaP epitaxial layer including a p-type semiconductor layer (12R) including a layer is grown, across the SiO 2 bond layer (11R) serving as a support substrate to the p-type semiconductor layer (12R) Bonding the sapphire substrate 10R and separating the GaAs substrate GS, which is a growth substrate, from the n-type semiconductor layer 14R on the opposite side thereof.
- a plurality of row and valley rows in the epi layer are etched to etch the p-type semiconductor layer over the sapphire substrate 10R or the bonding layer 11R thereon.
- a plurality of p-type semiconductor layer exposed grooves 120R formed by etching to a depth up to the GaP layer are formed so that the upper region of each light emitting cell CR includes the first region a1 and the second region a2. do.
- an n-type electrode pad 142R is formed on the n-type semiconductor layer 14R in the first region a1 so that the n-type electrode pad 142R is an n-type semiconductor layer ( 14R) and the p-type electrode pad 122R is formed on the n-type semiconductor layer 14R in the second region a2, and the p-type electrode pad 122R is a p-type semiconductor layer exposed groove 120R. Is connected to the p-type semiconductor layer 12R by the wiring layer L extending to).
- the LED wafer WR is divided into light emitting cells CR to manufacture a plurality of red LED chips 1R. Until this step, the n-type electrode pad 142R and the p-type electrode pad 122R face upward and the sapphire substrate 10R faces downward.
- the plurality of red LED chips 1R are turned upside down, and the n-type electrode pad 142R and the p-type electrode pad 122R are adhered to the horizontal bonding surface of the chip holding portion 2R.
- a plurality of red LED chips 1R are attached on the chip holding portion 2R.
- the top surfaces of the red LED chips 1R become the base surface of the sapphire substrate 10R, and a chip-on carrier having a constant height of all the LED chips 1R based on the adhesive surface of the chip holding unit 2R is manufactured.
- all the red LED chips 1R of the chip-on carrier are arranged to form a plurality of row arrays or column arrays on the chip holding unit 2R.
- a chip-on carrier in which a red LED chip 1R, a green LED chip 1G, and a blue LED chip 1B are sequentially attached to the chip holding unit 2 may also be considered.
- Such a chip-on carrier can move the red LED chip 1R, the green LED chip 1G, and the blue LED chip 1B all at once by the transfer printing process.
- the LED module 100 includes a rectangular substrate 110 and a plurality of electrodes formed in a matrix array to have a predetermined height on the substrate 110. Patterns 130 and a plurality of LED chip groups 150 arranged in a matrix array on the substrate 110 to correspond to the electrode patterns 130.
- the substrate 110 is an object in which the electrode patterns 130 are formed and the LED chips 151, 153, or 155 are mounted thereon, and the plurality of LED chips 151, 153, and 155 may be mounted at a predetermined height.
- Flat ones are used.
- the substrate 110 may be a rigid type or a flexible type, as long as the substrate 110 has a flat surface.
- the substrate 110 may be a rigid plastic substrate, a ceramic substrate, a glass substrate, or a flexible substrate such as an FPCB.
- the plurality of electrode patterns 130 are formed in a matrix arrangement on the substrate 110 and have the same height as a whole.
- the conductive metal film formed on a flat surface of the substrate 100 with a predetermined thickness may be partially removed using, for example, etching, or a conductive metal film having a predetermined pattern may be formed on the flat surface of the substrate 100 using a mask. As a result, a plurality of electrode patterns 130 having a predetermined height are formed.
- the plurality of electrode patterns 130 are formed in a matrix array including a horizontal direction and a vertical direction.
- the horizontal direction is defined as a direction parallel to the line Lx of FIGS. 7 and 8.
- the longitudinal direction is defined as a direction parallel to the line Ly in FIGS. 7 and 8.
- Each of the electrode patterns 130 may include a common electrode pad 139 aligned with a first end line EL ′ parallel to a longitudinal direction of the matrix array, and a second end line parallel to the first end line EL ′.
- first individual electrode pads 131, the second individual electrode pads 132, and the third individual electrode pads 133 may be individually connected to input power, which is not shown, in the completed electric circuit, and thus will be described in detail below. It enables independent control of LED chips.
- the common electrode pad 139 may have two grooves recessed in a substantially rectangular shape toward the inside of the first end line EL ′ and three branches whose shape is limited by the two grooves. , That is, the first branch 136, the second branch 137, and the third branch 138.
- Each of the first branch 136, the second branch 137, and the third branch 138 defines an area in which bonding bumps on one side of the LED chip are bonded, for bonding when the LED chips are flip chip bonded. It helps to prevent short defects and the like which may be caused by unwanted twisting or slipping of the bumps.
- the LED chips of different wavelengths may be arranged side by side at regular intervals.
- the first individual electrode pads 131, the second individual electrode pads 132, and the third individual electrode pads 133 are formed side by side with a predetermined interval.
- Each of the first individual electrode pads 131, the second individual electrode pads 132, and the third individual electrode pads 133 defines an area in which bonding bumps on the other side of the LED chip are bonded.
- first individual electrode pads 131, the second individual electrode pads 132, and the third individual electrode pads 133 may have end portions 131b, 132b, and 133b which coincide with the second end line EL. ) And other end portions 131c, 132c, and 133c adjacent to the common electrode pad 139 on the opposite side thereof, and side portions 131a, 132a, and 133a parallel to the horizontal direction.
- first individual electrode pads 131, the second individual electrode pads 132, and the third individual electrode pads 133 may be provided with a narrow portion positioned at the side ends 131b, 132b, and 133b. It is located on the end (131c, 132c, 133b) side and includes a wide portion having a larger width than the narrow portion. The position where the bump is formed is determined on the wide portion.
- the other ends 131c, 132c, and 133c of the individual electrode pads 131, 132, and 133 are ends of the branches 136, 137, and 138 of the common electrode pad 130 that coincide with the first end line EL ′. Adjacent to and parallel to (136 ', 137', 138 ').
- each of the plurality of LED chip groups 150 may be arranged in a row along the vertical direction to emit light having different wavelengths from the first LED chip 151 and the second LED.
- the chip 153 and the third LED chip 155 is included.
- the first LED chip 151 may be a red LED chip that emits light of approximately a red wavelength band by application of power
- the second LED chip 153 may be a green LED chip that emits light of a green wavelength band.
- the third LED chip 155 may be a blue LED chip that emits light in a blue wavelength band.
- the first LED chip 151 may include a first first electrode 151a bonded to the first individual electrode pad 131 by a first first bump 171a, and a first first chip 151a.
- the second LED chip 153 may include a 2nd first electrode 153a bonded to the second individual electrode pad 132 by a 2nd first bump 173a, and A second second electrode 153b bonded to the second branch 137 of the common electrode pad 139 by 2-2 bumps 173b faces the substrate 110. It is provided in the surface.
- the third LED chip 155 may include a third first electrode 155a bonded to the third individual electrode pad 133 by a third first bump 175a and a third first electrode 155a.
- a third second electrode 155b bonded to the third branch 138 of the common electrode pad 139 by a 3-2 second bump 175b faces the substrate 110. It is provided in the surface.
- All of the LED chips 151, 153, and 155 flip-bonded and arranged in a matrix on the substrate 110 need to have substantially the same height in order to obtain an intended color reproducibility.
- all of the LED chips including the first LED chip 151, the second LED chip 152, and the third LED chip 153 are equal to each other, and one surface of the first LED chip 151 is provided.
- One-first electrode 151a and two-first electrode 153a which are formed on one side, one side of one side of the second LED chip 152 and one side of one side of the third LED chip 153, and are disposed on the same virtual straight line.
- the height of the 3-1 electrode 155a are the same, and the other side of one side of the first LED chip 151, the other side of one surface of the second LED chip 152 and the other side of the third LED chip 153.
- the heights of the 1-2 electrodes 151b, the 2-2 electrodes 153b, and the 3-2 electrodes 155b, which are formed and placed on the same virtual straight line, are almost the same.
- first-first bump 171a, the second-first bump 173a, and the third-first bump 175a have a constant first height in a final compressed state
- first-second bump 171b, the 2-2 bump 173b, and the 3-2 bump 175b have a constant second height in the final compressed state
- first LED chip 151 and the second LED chip The first height and the second height may be different from each other so as to compensate for the height difference due to the step of each of the 153 and the third LED chip 155.
- each of the LED chips 151, 153 or 155 are exposed downward in an epi structure including a laminated structure of a transparent growth substrate (especially a sapphire substrate), a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer.
- the first conductive semiconductor layer may be formed by removing the second conductive semiconductor layer and a portion of the active layer in contact with each other by etching.
- the step difference due to the etching may be reduced, but in this case, there may be a fine step.
- the heights of the first-first bump 171a, the second-first bump 173a, and the third-first bump 175a are not compressed, and the heights of the first-second bump 171b are not included.
- the same height as the height of the second-second bump 173b and the third-second bump 175b is used.
- the first-first bump 171a and the second-first bump 173a to compensate for the step difference of the LED chip considering the height of the electrodes provided in each LED chip.
- the first height of the 3-1 bump 175a in the maximum compressed state, the 1-2 bump 171b, the 2-2 bump 173b, and the 3-2 bump 175b The height of the final compressed state can vary.
- each of the first-first bump 171a, the second-first bump 173a, and the third-first bump 175a is compressed to the first height to form a first individual electrode pad ( 131, the bonding area of the second individual electrode pad 132 and the third individual electrode pad 133 is 50 to 80% of the upper surface area of the wide portion.
- the first-second bump 171b, the second-second bump 173b, and the third-second bump 175b may be the first branch 136 and the second branch in the final compressed state. 137) and the three branches 138 each have a junction area of 50-80% of the top surface area.
- each bump 171a, 173a, 175a, 171b, 173b, or 175b has a junction area of 50 to 80% of the upper surface area of each branch of each individual electrode pad or common electrode pad, thereby providing a joint area thereof. Even if they are joined away from the area corresponding to, contact with other adjacent bumps is suppressed, which can prevent the risk of occurrence of shortage. In other words, even if the area to which the bumps 171a, 173a, 175a, 171b, 173b or 175b is predetermined is determined in the actual process, there is a possibility that the bumps may be biased toward the other bump side adjacent to the bumps due to slight twisting or slipping.
- the area is limited within 80% as described above, even if the bumps 171a, 173a, 175a, 171b, 173b, or 175b slip or twist in the actual process, the occurrence of short is blocked because they are not in contact with the neighboring bumps.
- the junction area is less than 50%, reliable bonding is not achieved, so the area where the bump is finally bonded to the individual electrode pads or branches is preferably at least 50% or more.
- Each of the first branch 136, the second branch 137, and the third branch 138 is a part of the common electrode pad, and includes the first-second bump 171b and the second-second bump 173b.
- the 1-2 bumps 171b, the 2-2 bumps 173b, and the 3-2 bumps (f) in the flip chip bonding process are defined. Essentially blocks short faults that may be caused by skew or slip of 175b).
- the first-second bump ( 171b), the second-2 bump 173b or the third-2 bump 175b may slide or twist on the common electrode pad to cause a short failure, etc., but the first, second and third branches If you put (136, 137 and 138).
- An area in which the first-second bump 171b, the second-second bump 173b, and the third-second bump 175b slip or bend on the common electrode pad 139 is limited, thereby preventing defects as described above. You can stop it.
- the plurality of LED chips 151, 152, and 153 flip-chip bonded onto the substrate 110 are grouped into a plurality of LED chip groups 150 having a matrix arrangement, and the plurality of LED chip groups 150 are described.
- the first LED chip 151, the second LED chip 153, and the third LED chip 155 belonging to each LED chip group 150 may include a first-first electrode 151a and a second-first electrode ( 153a and the third-first electrode 155a are electrically connected to the first, third and third individual electrode pads 131, 132, and 133, and the first-second electrode 151b and the first electrode.
- the 2-2 electrode 153b and the third-2 electrode 155b are electrically connected to the common electrode pad 130, and thus may be individually controlled.
- the horizontal spacing and vertical direction of the LED chip groups 150 arranged in a matrix on the substrate 110 are the same. Further, the horizontal spacing of the LED chip groups 150 and the LED chips 150 have the same vertical spacing. To this end, horizontal gaps and vertical gaps of the electrode patterns 130 formed in a matrix array on the substrate 110 are also identical to correspond to the LED chip groups 150. In addition, the horizontal spacing of the electrode patterns 130 and the vertical spacing of the electrode patterns 130 are preferably the same.
- an interval between the first LED 151 chip and the second LED chip 153 and an interval between chips between the second LED chip 153 and the third LED chip 155 are equal to about 0.3. It is preferable that it is-1.5 mm.
- the chip-to-chip spacing may be about 0.75 mm, and in the case of a UHD LED module, the chip-to-chip spacing may be 0.375 mm.
- the LED module 100 ′ illustrated in FIG. 10 includes a barrier 190 formed on the substrate 110 to prevent optical interference between neighboring LED chips 151, 153, or 155.
- the barrier 190 is formed between each of the first LED chip 151 and the second LED chip 153 and the second LED chip 153 and the third LED in each of the LED chip group 150.
- First light reflecting walls 191 formed between the chips 155, between the LED chip groups 150 and 150 neighboring in the vertical direction, and between the LED chip groups 150 and 150 neighboring in the horizontal direction.
- Second light reflecting walls 193 formed on the substrate.
- the first light reflecting walls 191 and the second light reflecting walls 193 may be formed by the neighboring LED chips in each adjacent LED chip group 150 and the neighboring LED chips 150, 150. It is possible to prevent output light from interfering between adjacent LED chips, thereby reducing the quality of the output light.
- a barrier that absorbs light between the LED chips 151, 153, and 155 or between the LED chips 150 may be used to prevent optical interference.
- the LED module manufacturing method including a pad 133 and a common electrode pad 139, forming the electrode patterns 130 on the substrate 110 in a matrix arrangement, as shown in FIG.
- the first-first bump 171a, the second-first bump 173a, and the third-first bump 175a may be disposed on the first individual electrode pad 131 and the second individual electrode.
- the 1-2 bumps 171b, the 2-2 bumps 173b, and the 3-2 bumps 175b are disposed on the common electrode pad 139.
- the method includes mounting a plurality of LED chips on the substrate 110 at a predetermined height and arranging the plurality of LED chips 150 on the substrate 110 (S03).
- the step S03 of arranging the LED chip group 150 on the substrate 110 may be performed in a predetermined matrix arrangement on the support B by using a roll-to-roll transfer printing technique.
- the plurality of LED chips 151, 153, and 155 disposed on the substrate 110 may be mounted on the substrate 110 in the original arrangement.
- the roll-to-roll transfer printing technique for the LED chips 151, 153, and 155 is a pickup that pressurizes the adhesive carrier and the adhesive carrier when picking up the LED chips 151, 153, and 155.
- the roll 40 and the chip placing roll 50 for pressing the LED chips 151, 153, and 155 at the time of mounting the LED chips 151, 153, and 155 on the substrate 110 are used.
- the pick-up roll 40 and the chip framing roll 50 support the LED chips 151, 153, 155 in their original arrangement by operating cooperatively with respect to the adhesive carrier at the chip pick-up position and the chip mounting position. It can be transferred from (B) to the substrate 110 and mounted.
- the adhesive carrier is an element having an adhesive force to adhere and move the plurality of LED chips 151, 153, and 155
- the pickup roll 40 includes a plurality of LED chips 151 located on the support B.
- 153, 155 is an element that presses the adhesive carrier against the LED chips to adhere to the adhesive carrier
- the chip placing roll 50 is a plurality of LED chips 151 in an arrangement bonded to the adhesive carrier The elements 153 and 155 are pressed against the substrate 110.
- the adhesive force of the adhesive carrier is partially weakened, or the LED chips 151, 153, and 155 are removed from the substrate (the chip placing roll 50).
- Means for weakening the adhesive force of the adhesive carrier as a whole may be further used immediately before mounting on 110.
- the step S03 of arranging the LED chip group 150 on the substrate 110 may include forming a first-first electrode (1-1) electrode on an adhesive carrier 10 ′ partially having an adhesive force weakening region.
- Each of the 1-1 electrode 151a, the 2-1 electrode 153a, and the 3-1 electrode 155a may be configured as the 1-1 bump 171a, the 2-1 bump 173a, and the The first-second bump 175a and the first-second electrode 151b, the second-second electrode 153b, and the third-second electrode 155b respectively face the first-second bump. Moving the adhesive carrier to face 171b, 2-2 bump 173b and 3-2 bump 175b, respectively.
- the adhesive carrier moving step S4 and the first-first bump 171a, the second-first bump 173a, and the third-first bump 175a are compressed to the first height, so that the first-second bump
- Bonding the LED chips in a matrix array may first expose the adhesive carrier 10 to form an adhesive carrier 10 ′ in which adhesion weakening regions and adhesion non-weakening regions are formed (S1). And press the non-weakened regions to the LED chips 151, 153, and 155 with the rotating pick-up roll 40 to bond the LED chips 151, 153, and 155 to the adhesive carrier 10 ′.
- Chip pick-up step (S3) may first expose the adhesive carrier 10 to form an adhesive carrier 10 ′ in which adhesion weakening regions and adhesion non-weakening regions are formed (S1). And press the non-weakened regions to the LED chips 151, 153, and 155 with the rotating pick-up roll 40 to bond the LED chips 151, 153, and 155 to the adhesive carrier 10 ′.
- the LED chips 151, 153, 155 are placed in a matrix arrangement on the support B before the LED chips 151, 153, 155 are attached to the adhesive carrier in a matrix arrangement.
- the matrix arrangement of the LED chips is a matrix arrangement when the LED chips 151, 153, and 155 are attached to the adhesive carrier 10 ′ having the adhesion weakening region in the subsequent processes and the LED chips 151.
- both the horizontal gap and the vertical gap are the same.
- an adhesive carrier 10 having no weakened adhesive force is disposed on the upper sides of the LED chips 151, 153, and 155, and the adhesive carrier 10 is first exposed thereon.
- the port mask 20 and the exposure device 30 may be disposed.
- the exposure machine 30 is formed by ultraviolet light.
- the ultraviolet light is irradiated only to a region that does not correspond to the LED chips 151, 153, and 155 of the entire region of the adhesive carrier 10 through the through hole of the photo mask 20.
- Ultraviolet light acts on the adhesive carrier 10 at a constant temperature of 200 ° C. or less to weaken the adhesion of some regions of the adhesive carrier 10. Thereby, the adhesive carrier 10 'in which the adhesive force weakening area
- the LED chips 151, 153, and 155 are attached to the non-weak area of the adhesive carrier 10 having the weakened area and the weakened area of adhesion.
- the pickup roll 40 disposed above the adhesive carrier 10 'having the adhesive force weakening region presses the adhesive carrier 10' onto the LED chips 151, 153, and 155.
- each of the adhesive carrier 10 ′ and the support B is fixed, and the LED chips 151, 153, and 153 are sequentially disposed on the entire area of the adhesive carrier 10 ′ while the pickup roll 40 rotates. Pressurize the field.
- the LED chips 151, 153, and 155 can be prevented from being sucked while slipping out of the set position with respect to the adhesive carrier 10 '.
- the chip placing step S7 is a chip placing roll 50 that rotates on an adhesive carrier 10 ", in which the adhesive force is weakened as a whole, and the LED chips 151, 153 and 155.
- a separation step S9 is performed in which the adhesive carrier 10 ", whose adhesive force is weakened overall, is detached from the LED chips 151, 153 and 155.
- Pressurization by the rotation of the chip placement roll 50 rotates the chip placement roll 50 to sequentially attach the LED chips 151, 153, and 155 adhered to the adhesive carrier 10 ′′ to the substrate 110.
- the above bumps may be heated to a predetermined temperature or more, and the LED chips 151, 153, and 155 are reliably mounted at predetermined heights and intervals at predetermined positions of the substrate 110 by the rotating placement roll 50.
- a large number of LED chips 151, 153, and 155 can be mounted on the substrate 110 in a short time, and in the mounted state, the first, second, and first to emit different wavelengths.
- the three LED chips 151, 153, and 155 may be grouped in LED chip groups corresponding to pixels, and the groups may be arranged in a predetermined matrix array to form an LED module. Since the LED chips arranged in a predetermined matrix arrangement are bonded together by an adhesive carrier and then moved and mounted on the substrate 110 as they are, the alignment and spacing between the LED chips 151, 153, and 155 can be precisely controlled. .
- the LED module having the LED chip arrays having different wavelengths as described above is not limited to the configuration and operation of the embodiments described above.
- the above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.
- a method of manufacturing an LED module includes a chip-on film manufacturing (or preparing) step (S1) including a chip retaining film having an adhesive force and a plurality of LED chips adhered to the chip retaining film, and an adhesive force.
- a chip placing step (S4) for transferring the LED chip to an AM matrix substrate.
- the chip pick-up step S2, the chip moving step S3, and the chip placing step S4 are put into a chip array device which will be introduced below, and are sequentially performed. It is performed in advance before the chip array process used.
- a plurality of pre-fabricated flip-bonded LED chips 1 are arranged on a chip holding film 2 having adhesiveness. It includes attaching with.
- the LED chip 1 includes a light emitting semiconductor unit 10 having two regions 1a and 1b disposed on the bottom thereof separated by a step, and a first conductive electrode pad 112 formed in each of the two regions 1a and 1b. And a second conductive electrode pad 142.
- the light emitting semiconductor unit 10 includes a base substrate 11, a first conductive semiconductor layer 12, an active layer 13, and a second conductive semiconductor layer 14.
- the base substrate 11 may be a sapphire growth substrate on which an epitaxial layer including the first conductive semiconductor layer 12, the active layer 13, and the second conductive semiconductor layer 14 is grown. It may also be a support substrate to which the epi layers are attached.
- the step is formed so that both exposed regions of the first conductive semiconductor layer 12 and the second conductive semiconductor layer 14 are formed on the bottom, and the exposed region 1a of the first conductive semiconductor layer 12 side.
- the first conductive electrode pad 112 is formed on the second conductive semiconductor pad 14, and the second conductive electrode pad 142 is formed on the exposed region 1b of the second conductive semiconductor layer 14.
- the plurality of LED chips 1 are arranged such that the first conductive electrode pads 112 and the second conductive electrode pads 142 face downward to be bonded to the adhesive surface of the chip holding film 2.
- the chip holding film 2 is configured to weaken adhesion by UV light irradiation. Therefore, when UV light is irradiated to a specific region on the chip holding film 2, the adhesion of the specific region is relatively weakened.
- the chip pick-up step S2, the chip move step S3, and the chip placing step S4 may include a carrier tape 3, a pick-up stage 210,
- the photomask 220 may be sequentially performed by a chip array device including a photomask 220, a UV scan set 230 for film exposure, a pickup roller 240, a placement roller 260, and a UV light source 250 for tape exposure.
- the chip-on film c1 including the chip holding film 2 having the adhesive force and the plurality of LED chips 1 arranged thereon is a pickup 210.
- the LED chip array pitch on the chip holding film 2 is determined differently from the LED chip array pitch on the substrate 5 as the final target.
- the number of LED chips in the LED chip array on the substrate 5 see FIGS. 17 and 18 as the final target, that is, the number of LED chips in the LED chip array on the chip holding film 2 relative to the number of electrode pairs is 1 : It is decided by ratio of n (natural number one or more).
- the LED chip 1 corresponding to n times the number of the LED chips 1 to be disposed on the substrate 5 is attached to the chip holding film 2, and the chip holding film is attached to the chip holding film 2.
- Some of the LED chips 1 attached to (2) may be selectively detached and attached to the substrate 5.
- the substrate 5 may be a substrate on which an electric circuit is formed, more specifically, an AM matrix substrate.
- a step of weakening the adhesive force is performed by selecting only the region where the specific LED chip 1 is attached among the various regions of the chip holding film 2.
- a photomask 220 and a film exposure UV scan set 230 positioned directly below the UV transmitting upper plate 211 are used, and a plurality of UV transmitting windows 222 are formed on the photomask 220. do.
- the film exposure UV scan set 230 is a light source for moving the film exposure UV light source 234 and the film exposure UV light source 234 to a position corresponding to a specific UV transmission window 222 among the plurality of UV transmission windows 222.
- the moving unit 232 is included.
- the UV light source 234 located directly below the specific UV transmission window 222 is a UV exposure through which the UV irradiation window 222 irradiates UV to a specific area of the chip holding film 2 to which the specific LED chip 1 is attached. This UV exposure weakens the adhesion of the chip retaining film 2 to the specific LED chip 1.
- the plurality of UV transmission windows 222 may be arranged in the X-axis direction and the Y-axis direction orthogonal thereto, and the Kangwon moving part 232 may move the UV light source 234 in the X-axis direction and the Y-axis direction. You can move it.
- the pickup roller 240 While weakening the adhesion of the chip holding film 2 to the selected LED chip 1 as described above, the pickup roller 240 is pressed in the carrier tape 3 against the selected LED chip 1 while rolling in one direction.
- the selected LED chip 1 is attached to the carrier tape 3.
- Rolling of the pick-up roller 240 may be implemented by a translational movement of the rotating pick-up roller 240 itself, or may be implemented by the stage 210 translates while the pick-up roller 240 rotates in place.
- the adhesion of one area of the chip holding film 2 exposed to UV light is less than the adhesion of the carrier tape 3, and thus the selected LED chip 1 is applied to the carrier tape 3. Attached. UV exposure in the area of the chip retaining film 2, even if all the LED chips 1 in a particular LED chip array on the chip retaining film 2 are in contact with the carrier tape 3 by the rolling rotational pressure of the pickup roller 240 Only the LED chips 1 in the area weakened by the adhesive force, that is, the selected LED chips 1 are attached to the carrier tape 3 and not exposed to the remaining LED chips 1, that is, UV light. The LED chips 1 on the adhesive deterioration area remain in the chip retaining film 2 and remain. The LED chips 1 remaining in the chip holding film 2 may be separated from the chip holding film 2 by another chip pick-up step in a process which is subsequently performed repeatedly.
- the pickup roller 240 has a flexible blanket 242 on the outer circumferential side of the roller body 241 coupled with the shaft, the LED chip 1 is better attached to the carrier tape 3 It also makes it possible to prevent damage to the LED chip 1 by pressing.
- the selection of the LED chip 1 to be picked up is carried out in the X-axis or Y-axis direction of the film light-emitting UV light source 234 by the light source moving part 232 and the film light-emitting UV light source 234 and the photomask 220.
- UV attachment window 222 and the attachment area of the LED chip 1 to be picked up are present on the virtual same vertical line.
- the pitch of the LED chip 1 in the specific LED chip array on the chip holding film 1 is different from the pitch of the electrode pairs on the substrate on which the LED chip is mounted, whereby the specific LED chip on the chip holding film 2 is different.
- the arrangement ratio of the LED chips in the array The arrangement ratio of the substrate electrode pairs (ie, the LED chip array LED chip arrangement ratio on the target substrate) is n: 1. In this case, pickup and placing down can be repeated by the number of n.
- a chip movement step S3 through one-way flow movement of the carrier tape 3 to which the LED chip 1 is picked up is performed.
- the carrier tape 3 has a predetermined adhesive force to the LED chip 1.
- the carrier cape 3 is moved in a state in which the LED chip 1 is attached and held by moving means such as a feeding roller and a guiding roller.
- the UV light source 250 for tape exposure may be disposed in the middle of the flow path of the carrier tape 3 or near the placing roller 260, which is irradiated with UV light to the carrier tape 3.
- the adhesive force of the carrier tape 3 can be weakened as a whole.
- one region of the carrier tape 1 to which the LED chips 1 are attached is moved between the placement roller 260 and the substrate 5 on which the bump pairs 5a and 5b are preformed.
- the adhesive force of the carrier tape 3 exposed to the UV light is smaller than the adhesive force by the adhesive previously raised on the substrate 5, more specifically to the bump pairs 5a and 5b.
- the placement roller 260 rotates rolling to press the LED chips 1 attached to the carrier tape 3 onto the substrate 5, more specifically to the bump pairs 5a and 5b on the substrate 5.
- the placement roller 260 is provided with a flexible blanket 262 on the outer circumferential side of the roller body 261 coupled with the shaft, so that the LED chip 1 can be better placed down through the rolling rotation. In addition, it also prevents the damage of the LED chip (1) by rolling rotation pressing.
- the LED chips 1 placed down on the substrate 5 may be bonded onto the substrate 1 by a reflow soldering process.
- 20A and 20BB are diagrams for comparing the LED chip pick-up by the front-side transfer with the LED chip pick-up by the selective transfer.
- one pick-up operation may be used to pick up the LED chips 1 in one array a1, and as shown in FIG. 20B, one pick-up operation may be performed in two or more arrays a1 and a2. It may also be used to pick up the LED chips 1 together.
- the present invention can be advantageously used for the selective pickup of the LED chips 1 attached to the chip retaining film 2 in a complex pattern rather than in a matrix arrangement.
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Abstract
Description
Claims (20)
- 수평의 접착면을 갖는 칩 유지부 및 상기 칩 유지부의 접착면에 전극패드들이 접착된 다수의 엘이디 칩들을 포함하는 칩온 캐리어를 제작하는 칩온 캐리어 제작 공정과,상기 칩 유지부로부터 다른 위치에 있는 기판으로 상기 다수의 엘이디 칩들을 일정 배열로 옮기는 전사 프린팅 공정을 포함하며,상기 전사 프린팅 공정은,트랜스퍼 테이프의 접착력을 약화시키는 광에 상기 트랜스퍼 테이프를 영역적으로 노출시켜, 상기 트랜스퍼 테이프에 정해진 간격으로 접착 영역들을 형성하는 1차 노광 단계; 및상기 트랜스퍼 테이프를 상기 칩 유지부 상의 상기 엘이디 칩들에 가압하여, 상기 트랜스퍼 테이프의 상기 접착 영역들 각각에 상기 엘이디 칩들 각각을 부착시키는 한편, 상기 엘이디 칩의 전극패드들을 상기 칩 유지부로부터 분리시키는, 칩 픽업 단계를 포함하는 것을 특징으로 하는 엘이디 모듈 제조방법.
- 청구항 1에 있어서,상기 1차 노광 단계는 복수의 광 투과창이 형성된 포토마스크를 이용하여, 광을 상기 광 투과창을 통해 상기 트랜스퍼 테이프에 노출시키는 것을 특징으로 하는 엘이디 모듈 제조방법.
- 청구항 1에 있어서,상기 칩 픽업 단계 후, 상기 엘이디 칩들이 부착된 상기 트랜스퍼 테이프의 접착력을 전체적으로 약화시키는 2차 노광 단계와, 접착력이 전체적으로 약화된 상기 트랜스퍼 테이프로부터 상기 기판으로 상기 다수의 엘이디 칩을 옮기는 플레이싱 단계를 더 포함하는 것을 특징으로 하는 엘이디 모듈 제조방법.
- 청구항 1에 있어서,상기 칩 픽업 단계는 일방향으로 롤링 회전하는 픽업 롤러로 상기 트랜스퍼 테이프를 상기 칩 유지부 상에 접착되어 있는 상기 엘이디 칩에 가압하는 것을 특징으로 하는 엘이디 모듈 제조방법.
- 청구항 3에 있어서,상기 플레이싱 단계는 플레이싱 롤러로 상기 트랜스퍼 테이프에 부착된 상기 엘이디 칩을 상기 기판 상에 가압하여, 상기 엘이디 칩들의 전극패드들이 상기 기판 상에 미리 형성된 범프 쌍에 부착되게 하는 것을 특징으로 하는 엘이디 모듈 제조방법.
- 청구항 5에 있어서,상기 플레이싱 단계에서 상기 트랜스퍼 테이프의 접착력은 상기 범프 쌍에 미리 올린 접착제에 의한 접착력보다 작은 것을 특징으로 하는 엘이디 모듈 제조방법.
- 청구항 1에 있어서,상기 칩온 캐리어 제작 공정은, 수평의 접착면을 갖는 칩 유지부를 준비하는 단계; 다수의 엘이디 칩을 준비하는 단계; 및 하나 이상의 엘이디 칩 어레이를 이루도록, 상기 접착면 상에 상기 다수의 엘이디 칩을 접착하는 칩 부착 단계를 포함하며,상기 다수의 엘이디 칩을 준비하는 단계는 n형 전극패드와 p형 전극패드가 아래로 연장된 다수의 엘이디 칩을 준비하고, 상기 칩 부착 단계는 상기 n형 전극패드 및 상기 p형 전극패드를 상기 접착면에 직접 접착시키는 것을 특징으로 하는 엘이디 모듈 제조방법.
- 청구항 7에 있어서,상기 칩 부착 단계는 상기 칩 유지부 상에서 상기 엘이디 칩 어레이 내 피치가 상기 전사 프린팅 공정에 의해 상기 기판에 옮겨지는 엘이디 칩 어레이 내 피치의 1/n배가 되도록, 상기 다수의 엘이디 칩을 상기 접착면에 부착하되, 여기에서, n은 1이상의 자연수이고, 상기 피치는 이웃하는 두 엘이디 칩에서 하나의 엘이디 칩 중심과 다른 엘이디 칩 중심 간의 수평 거리인 것을 특징으로 하는 엘이디 모듈 제조 제조방법.
- 일측에 전극패드를 구비하고, 타측에 트랜스퍼 테이프와 접착되는 면을 가지며, 외부의 칩 유지부로부터 옮겨져 어레이되는 다수의 엘이디 칩; 및상기 전극패드와 플립본딩되는 다수의 범프를 갖는 기판을 포함하며,상기 트랜스퍼 테이프는, 외부에서 상기 엘이디 칩의 타측으로 조사되는 1차 광에 의해 노출 영역과 비 노출 영역으로 나뉘며, 상기 비 노출 영역은 접착영역으로 상기 엘이디 칩을 접착하여 픽업하는 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서상기 트랜스퍼 테이프의 상기 접착 영역은, 상기 외부에서 상기 엘이디 칩의 타측으로 조사되는 2차 광에 의해, 접착력이 저하되어, 상기 엘이디 칩과 분리되는 것을 특징으로 하는 엘이디 모듈
- 청구항 9에 있어서상기 트랜스퍼 테이프의 상기 접착 영역은, 포토마스크를 이용하여 상기 외부에서 상기 엘이디 칩 타측으로 조사되는 1차 광에 노출되지 않는 영역들인 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서상기 픽업은 롤러를 이용하여 상기 트랜스퍼 테이프를 상기 엘이디 칩에 가압하면서 회전하여 상기 엘이디 칩을 픽업하는 것을 특징으로 하는 엘이디 모듈
- 청구항 10에 있어서상기 엘이디 칩은 상기 기판 상의 안착 위치에 정렬된 후 롤러의 가압 회전을 통하여 상기 트랜스퍼 테이프로부터 분리되는 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서상기 칩 유지부는 수평의 접착면을 포함하며, 상기 다수의 엘이디 칩의 일측에 있는 전극패드 각각이 아래로 연장된 채 상기 칩 유지부에 직접 접착되는 것을 특징으로 하는 엘이디 모듈
- 청구항 14에 있어서상기 칩 유지부의 접착면을 기준으로 상기 다수의 엘이디 칩은 모두 동일한 높이를 갖는 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서상기 칩 유지부상에서 상기 엘이디 칩 어레이 내 피치는 상기 기판에 옮겨지는 엘이디 칩 어레이 내 피치의 1/n배이며, 여기에서, n은 1이상의 자연수이고, 상기 피치는 이웃하는 두 엘이디 칩에서 하나의 엘이디 칩 중심과 다른 엘이디 칩 중심 간의 수평 거리인 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서상기 칩 유지부의 접착력은 상기 트랜스퍼 테이프의 상기 비 노출 영역의 접착력보다 작고 상기 트랜스퍼 테이프의 상기 노출 영역의 접착력보다 큰 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서칩 유지부에 어레이 되어 있는 상기 다수의 엘이디 칩은 모두 동일한 하나의 엘이디 칩 제조 공정을 통해 제조된, 적색, 녹색 또는 청색 중 어느 한 종류의 엘이디 칩들만으로 이루어진 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서칩 유지부에 어레이 되어 있는 상기 다수의 엘이디 칩은 적색 엘이디 칩과, 녹색 엘이디 칩과, 청색 엘이디 칩을 포함하는 것을 특징으로 하는 엘이디 모듈.
- 청구항 9에 있어서상기 칩 유지부는 유연성을 갖는 필름인 것을 특징으로 하는 엘이디 모듈.
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CN201780035169.2A CN109314126A (zh) | 2016-08-11 | 2017-08-01 | Led模块及其制造方法 |
US15/558,192 US10559554B2 (en) | 2016-08-11 | 2017-08-01 | Method for fabricating LED module using transfer tape |
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US16/717,696 US10756071B2 (en) | 2016-08-11 | 2019-12-17 | LED module and method for fabricating the same |
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