WO2022239670A1 - 接続構造体の製造方法、及び接続フィルム - Google Patents
接続構造体の製造方法、及び接続フィルム Download PDFInfo
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- WO2022239670A1 WO2022239670A1 PCT/JP2022/019277 JP2022019277W WO2022239670A1 WO 2022239670 A1 WO2022239670 A1 WO 2022239670A1 JP 2022019277 W JP2022019277 W JP 2022019277W WO 2022239670 A1 WO2022239670 A1 WO 2022239670A1
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- film
- rubber layer
- wiring board
- adhesive layer
- chip component
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- H01L24/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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- 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
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/57—Working by transmitting the laser beam through or within the workpiece the laser beam entering a face of the workpiece from which it is transmitted through the workpiece material to work on a different workpiece face, e.g. for effecting removal, fusion splicing, modifying or reforming
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- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
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- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
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Definitions
- This technology relates to a method for manufacturing a connection structure that connects a chip component to a substrate, and a connection film.
- micro LEDs have been actively developed as next-generation displays for LCDs (Liquid Crystal Displays) and OLEDs (Organic Light Emitting Diodes).
- LCDs Liquid Crystal Displays
- OLEDs Organic Light Emitting Diodes
- the current main mass transfer method is to use a stamp material to transfer the LEDs to the panel substrate side.
- FIG. 11 is a diagram schematically showing stamp-type mass transfer.
- the LED 101 is transferred from the transfer material 102 to the stamp material 103 and picked up, and as shown in FIGS.
- the LED 101 is attached.
- the method using a stamp material is not suitable for mass production because the pitch of the LEDs 101 depends on the pattern of the stamp material 103, the degree of freedom in design is low, the chip transfer rate is low, and it takes a long time.
- FIG. 12 is a diagram schematically showing laser mass transfer.
- the LED 111 is transferred from the transfer material 112 to the release material 113 and picked up, and as shown in FIG. It is made to land on the connection film 115 of the panel substrate 114 .
- Chip transfer by the laser method has a higher degree of design freedom than stamp materials, and the chip transfer takt time is very fast.
- the LED is flipped off and hits the panel substrate side at a very high speed, so that the LED is displaced, deformed, removed, destroyed, etc. as shown in FIG. 12D, for example. and may cause defects.
- the present technology has been proposed in view of such conventional circumstances, and provides a method for manufacturing a connection structure and a connection film that can obtain excellent adhesion elasticity and conductivity of chip parts by irradiation with a laser beam. offer.
- a chip component provided on a base material having transparency to laser light and a wiring board are opposed to each other, and laser light is irradiated from the side of the base material. and a connecting step of connecting the chip component and the wiring board via a connecting film, wherein the connecting film connects the rubber layer and the adhesive layer.
- the connection film is arranged on the electrode surface of the wiring board, and the rubber layer and the electrode surface of the chip component are caused to collide with each other.
- a chip component provided on a base material having transparency to laser light and a wiring board are opposed to each other, and laser light is irradiated from the side of the base material. and a connecting step of connecting the chip component and the wiring board via a connecting film, wherein the connecting film has an adhesive layer, and the connecting film has an adhesive layer.
- the chip component has a rubber layer on the electrode surface, and in the landing step, the connection film is arranged on the electrode surface of the wiring board, and the adhesive layer and the rubber layer of the chip component collide with each other.
- a chip component provided on a base material having transparency to laser light and a wiring board are opposed to each other, and laser light is irradiated from the side of the base material. and a connecting step of connecting the chip component and the wiring board via a connecting film, wherein the connecting film connects the rubber layer and the adhesive layer.
- the connection film is arranged on the electrode surface of the chip component, and the rubber layer and the electrode surface of the wiring board are brought into contact with each other.
- a chip component provided on a base material having transparency to laser light and a wiring board are opposed to each other, and laser light is irradiated from the side of the base material. and a connecting step of connecting the chip component and the wiring board via a connecting film, wherein the connecting film has an adhesive layer, and the connecting film has an adhesive layer.
- the wiring substrate has a rubber layer on an electrode surface, and in the landing step, the connection film is arranged on the electrode surface of the chip component, and the adhesive layer and the rubber layer of the wiring substrate are caused to collide.
- a connection film according to the present technology has a rubber layer and an adhesive layer, and the thickness of the rubber layer is 0.5 ⁇ m or more and 3.0 ⁇ m or less.
- FIG. 1 is a cross-sectional view schematically showing a state in which a light-emitting element provided on a substrate and a connection film on a wiring substrate are opposed to each other.
- FIG. 2 is an enlarged view showing the facing light emitting element and the connection film on the wiring board.
- FIG. 3 is a cross-sectional view schematically showing a state in which laser light is irradiated from the substrate side, and the light emitting elements are transferred to predetermined positions on the wiring substrate and arranged.
- FIG. 4 is a cross-sectional view schematically showing a state in which a light emitting element is mounted on a wiring board.
- FIG. 5 is a cross-sectional view schematically showing a state in which a light-emitting element provided on a substrate and having a rubber layer on an electrode surface and an anisotropic conductive adhesive layer on a wiring substrate are opposed to each other.
- FIG. 6 is a cross-sectional view schematically showing a state in which a light-emitting element provided on a substrate and having a connection film on an electrode surface and a wiring substrate are opposed to each other.
- FIG. 7 is a cross-sectional view schematically showing a state in which a light-emitting element provided on a substrate and having an anisotropic conductive adhesive layer on an electrode surface faces a rubber layer on a wiring board.
- FIG. 8 is a cross-sectional view schematically showing a first structural example of the connecting film.
- FIG. 9(A) is a plan view showing two rubber layers having voids therein due to processing
- FIG. 9(B) is a cross-sectional view schematically showing a second structural example of the connecting film.
- FIG. 10 is a cross-sectional view schematically showing a third structural example of the connecting film.
- FIG. 11 is a diagram schematically showing stamp-type mass transfer.
- FIG. 12 is a diagram schematically showing laser mass transfer.
- connection structure a chip component provided on a substrate having transparency to laser light and a wiring substrate are opposed to each other, and a laser beam is irradiated from the substrate side. and a connecting step of connecting the chip component and the wiring board via a connecting film, wherein the connecting film connects the rubber layer and the adhesive layer.
- the connection film is arranged on the electrode surface of the wiring board, and the rubber layer and the electrode surface of the chip component are brought into contact with each other.
- the adhesive layer in the connecting film is preferably an anisotropic conductive adhesive layer containing conductive particles. This makes it possible to connect the chip component and the wiring board even when the chip component is not provided with connection portions such as eutectic type solder bumps. Further, in the case where the electrodes of the chip component are protruded and can be electrically connected to the wiring of the wiring substrate, the adhesive layer does not need to contain conductive particles.
- chip components include semiconductor chips, LED chips, and the like, and are not particularly limited. It can be suitably used for mass transfer to be mounted on.
- connection structure a method of manufacturing a connection structure, a method of manufacturing a display device in which a plurality of light emitting elements, which are LED chips, are arranged on a wiring substrate, which is a panel substrate, to form a light emitting element array will be described.
- a so-called flip-chip type LED having a first conductivity type electrode and a second conductivity type electrode on one side can be used as the light emitting element.
- the light-emitting elements are arranged on the substrate corresponding to each sub-pixel forming one pixel to form a light-emitting element array.
- One pixel may be composed of, for example, three sub-pixels of R (red), G (green) and B (blue), or may be composed of four sub-pixels of RGBW (white) and RGBY (yellow). , RG, and GB.
- sub-pixel arrangement methods include stripe arrangement, mosaic arrangement, and delta arrangement in the case of RGB, for example.
- the stripe arrangement is obtained by arranging RGB in vertical stripes, and high definition can be achieved.
- the mosaic arrangement is obtained by arranging the same colors of RGB obliquely, and it is possible to obtain a more natural image than the stripe arrangement.
- RGB are arranged in a triangle, and each dot is shifted by half a pitch for each field, so that a natural image display can be obtained.
- Table 1 shows the estimated horizontal pitch between RGB, the estimated chip size, and the estimated electrode size with respect to PPI (Pixels Per Inch) when each RGB chip is arranged in the horizontal direction.
- the minimum distance between chips was assumed to be 5 ⁇ m, and the estimated distance between RGB was maximized when arranged at equal intervals. This is calculated as a reference value for clarifying the application and examining the present technology.
- the chip does not necessarily have to be rectangular, and may be square.
- a landing step (A1) for irradiating a laser beam to land a light emitting element on the wiring board side and a connection step (B1) for connecting the light emitting element and the wiring board will be described below with reference to FIGS. do.
- FIG. 1 is a cross-sectional view schematically showing a state in which a light emitting element provided on a substrate and a connection film on a wiring board are opposed to each other, and FIG. It is an enlarged view showing a connection film.
- the chip component substrate 10 and the wiring substrate 30 are opposed to each other.
- the chip component substrate 10 includes a base material 11, a release material 12, and light emitting elements 20, and the light emitting elements 20 are attached to the surface of the release material 12.
- the base material 11 may be any material as long as it is transparent to laser light, and is preferably quartz glass having high light transmittance over all wavelengths.
- the release material 12 only needs to have an absorption characteristic with respect to the wavelength of the laser light, and generates a shock wave when irradiated with the laser light, and repels the light emitting element 20 toward the wiring substrate 30 side.
- Examples of the release material 12 include polyimide.
- a thickness T12 of the release material 12 is, for example, 0.5 ⁇ m or more.
- the light emitting element 20 includes a main body 21, a first conductivity type electrode 22, and a second conductivity type electrode 23.
- the first conductivity type electrode 22 and the second conductivity type electrode 23 are arranged on the same side. It has a horizontal structure.
- the main body 21 includes a first conductivity type clad layer made of, for example, n-GaN, an active layer made of, for example, an In x Al y Ga 1-xy N layer, and a second conductivity type clad layer made of, for example, p-GaN. and has a so-called double heterostructure.
- the first-conductivity-type electrode 22 is formed on a portion of the first-conductivity-type clad layer by the passivation layer, and the second-conductivity-type electrode 23 is formed on a portion of the second-conductivity-type clad layer.
- a voltage is applied between the first-conductivity-type electrode 22 and the second-conductivity-type electrode 23, carriers concentrate in the active layer and recombine to generate light emission.
- the width W20 of the light emitting element 20 is, for example, 1 to 100 ⁇ m, and the thickness T20 of the light emitting element 20 is, for example, 1 to 20 ⁇ m.
- the wiring substrate 30 includes a circuit pattern for the first conductivity type and a circuit pattern for the second conductivity type on the substrate 31, and the light emitting elements are arranged in units of sub-pixels constituting one pixel. , there are a first electrode 32 and a second electrode 33 at positions corresponding to, for example, the p-side first conductivity type electrode and the n-side second conductivity type electrode, respectively. Also, the wiring substrate 30 forms circuit patterns such as data lines and address lines of matrix wiring, for example, so that light-emitting elements corresponding to sub-pixels forming one pixel can be turned on and off.
- the wiring substrate 30 is preferably a transparent substrate, and the substrate 31 is preferably a transparent substrate such as glass, PET (Polyethylene Terephthalate), or polyimide.
- the two electrodes 33 are preferably transparent conductive films such as ITO (Indium-Tin-Oxide), IZO (Indium-Zinc-Oxide), ZnO (Zinc-Oxide), and IGZO (Indium-Gallium-Zinc-Oxide).
- ITO Indium-Tin-Oxide
- IZO Indium-Zinc-Oxide
- ZnO Zinc-Oxide
- IGZO Indium-Gallium-Zinc-Oxide
- connection film 40 has a rubber layer 41 and an anisotropic conductive adhesive layer 42 , and is attached onto the wiring board 30 with the rubber layer 41 facing the light emitting element 20 .
- the rubber layer 41 is preferably made of one or more selected from silicone rubber and acrylic rubber.
- the thickness of the rubber layer 41 is preferably 0.5 ⁇ m or more and 3.0 ⁇ m or less, more preferably 0.5 ⁇ m or more and 2.0 ⁇ m or less, and still more preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less.
- the rubber layer 41 preferably has voids inside, and preferably has a shape such as a net shape or a protrusion shape. Thereby, it is possible to improve the cushioning property in the landing process, and to improve the breakthrough property of the light emitting element 20 in the connection process.
- the anisotropic conductive adhesive layer 42 preferably contains conductive particles 43 in a thermosetting binder.
- the thickness T40 of the connection film 40 is, for example, 20 ⁇ m or less. Also, the distance D between the light emitting element 20 and the connection film 40 is preferably 10 to 1000 ⁇ m, more preferably 50 to 500 ⁇ m, even more preferably 80 to 200 ⁇ m.
- FIG. 3 is a cross-sectional view schematically showing a state in which laser light is irradiated from the substrate side, and the light emitting elements are transferred to predetermined positions on the wiring substrate and arranged.
- a laser beam 50 is irradiated from the substrate 11 side, the light emitting elements 20 are transferred to predetermined positions on the wiring substrate 21, and arranged on the connection film 40.
- FIGS. 1 In the landing step (A1), a laser beam 50 is irradiated from the substrate 11 side, the light emitting elements 20 are transferred to predetermined positions on the wiring substrate 21, and arranged on the connection film 40.
- a lift (LIFT: Laser Induced Forward Transfer) device can be used to transfer the light emitting element 20 .
- the wrist device includes, for example, a telescope that converts the pulsed laser beam emitted from the laser device into parallel beams, a shaping optical system that uniformly shapes the spatial intensity distribution of the pulsed laser beam that has passed through the telescope, and a shaping optical system.
- a mask that passes shaped pulsed laser light in a predetermined pattern, a field lens positioned between the shaping optical system and the mask, and a projection lens that reduces and projects the laser light that has passed through the pattern of the mask onto a donor substrate.
- a chip component substrate 10 which is a donor substrate
- a wiring substrate 30, which is a receptor substrate is held on the receptor stage.
- an excimer laser that oscillates laser light with a wavelength of 180 nm to 360 nm can be used.
- the oscillation wavelengths of the excimer laser are, for example, 193, 248, 308, and 351 nm, and can be suitably selected from among these oscillation wavelengths according to the light absorption of the release 12 material.
- a pattern is used in which an array of windows of a predetermined size is formed at a predetermined pitch so that projection on the interface between the base material 11 and the release material 12 results in a desired array of laser light.
- the substrate 11 is patterned by, for example, chromium plating, and the window portions not plated with chrome transmit the laser light, and the portions plated with chrome block the laser light.
- the emitted light from the laser device enters the telescope optical system and propagates to the shaping optical system beyond that.
- the laser light immediately before entering the shaping optical system is adjusted by the telescope optical system so that it is generally parallel light at any position within the X-axis movement range of the donor stage. They are generally incident on the optical system at the same size and at the same angle (perpendicular).
- the laser light that has passed through the shaping optical system enters the mask through a field lens that forms an image-side telecentric reduction projection optical system in combination with the projection lens.
- the laser light that has passed through the mask pattern changes its propagation direction vertically downward by the epi-illumination mirror and enters the projection lens.
- the laser light emitted from the projection lens enters from the side of the substrate 11 and is accurately projected onto a predetermined position of the release material 12 formed on the surface (lower surface) of the substrate 11 in the reduced size of the mask pattern. .
- the pulse energy of the image-forming laser light irradiated to the interface between the substrate 11 and the release material 12 is preferably 0.001 to 2 J, more preferably 0.01 to 1.5 J, and still more preferably 0. .1 to 1 J.
- the fluence is preferably 0.001 to 2 J/cm 2 , more preferably 0.01 to 1 J/cm 2 , still more preferably 0.05 to 0.5 J/cm 2 .
- the pulse width (irradiation time) is preferably 0.01 to 1 ⁇ 10 9 picoseconds, more preferably 0.1 to 1 ⁇ 10 7 picoseconds, still more preferably 1 to 1 ⁇ 10 5 picoseconds. is.
- the pulse frequency is preferably 0.1 to 10000 Hz, more preferably 1 to 1000 Hz, still more preferably 1 to 100 Hz.
- the number of irradiation pulses is preferably 1 to 30,000,000.
- a shock wave is generated in the release material 12 irradiated with laser light at the interface between the base material 11 and the release material 12, and the plurality of light emitting elements 20 are separated from the base material 11. can be lifted toward the wiring board 30 and the plurality of light emitting elements 20 can be landed on predetermined positions of the wiring board 30 via the connection films 40 .
- the connecting film 40 has the rubber layer 41 on the side of the plurality of light emitting elements 20, the shock when the light emitting elements 20 hit at ultra high speed is reduced, and the light emitting elements 20 are prevented from being shifted, deformed, destroyed, or damaged. It is possible to suppress the occurrence of defects such as dropouts and obtain a high hit success rate.
- FIG. 4 is a cross-sectional view schematically showing a state in which a light emitting element is mounted on a wiring board. As shown in FIG. 4, in the connection step (B1), the light emitting elements 20 arranged at predetermined positions on the wiring board 30 are mounted.
- thermocompression bonding the light emitting element 20 to the wiring board 30 As a method for thermocompression bonding the light emitting element 20 to the wiring board 30, a connection method used in known anisotropic conductive films can be appropriately selected and used.
- the thermocompression bonding conditions are, for example, a temperature of 150° C. to 260° C., a pressure of 5 MPa to 60 MPa, and a time of 5 seconds to 300 seconds.
- the rubber layer 41 of the connection film 40 is pierced by the first conductivity type electrode 22 and the second conductivity type electrode 23 of the light emitting element 20 during thermocompression bonding. Then, the conductive particles 43 of the anisotropic conductive adhesive layer 42 are between the first conductivity type electrode 22 and the second conductivity type electrode 23 of the light emitting element 20 and the first electrode 32 and the second electrode 33 of the wiring board 30.
- the anisotropic conductive film is formed by sandwiching and hardening the binder of the anisotropic conductive adhesive layer 42 .
- connection film having the rubber layer and the adhesive layer is arranged on the electrode surface of the wiring substrate, and the rubber layer and the electrode surface of the chip component are caused to collide.
- the landing process it is possible to suppress the occurrence of defects such as displacement, deformation, breakage, and removal of the chip parts, and to transfer and arrange the chip parts with high accuracy and high efficiency. It can penetrate the rubber layer and obtain excellent conductivity.
- connection film is attached to the entire surface of the wiring board.
- mass transfer technology may be used to transfer individual pieces of the connection film to the electrode positions on the wiring board.
- the transparency of the light-emitting element array can be improved by selectively attaching the connecting film only to the positions where the chip components are to be blown, instead of attaching the connection film to the entire surface.
- connection film having the rubber layer and the adhesive layer is arranged on the wiring board, but the rubber layer may be arranged on the electrode surface of the chip component and the adhesive layer may be arranged on the wiring board.
- a chip part provided on a base material having transparency to laser light and a wiring board are opposed to each other, and a laser beam is emitted from the base material side.
- the chip component has a rubber layer on the electrode surface, and in the landing step, the connection film is arranged on the electrode surface of the wiring board, and the adhesive layer and the rubber layer of the chip component collide with each other.
- a method of manufacturing a connection structure a method of manufacturing a display device in which a plurality of light emitting elements, which are LED chips, are arranged on a wiring substrate, which is a panel substrate, to form a light emitting element array.
- the landing step (A2) and the connecting step (B2) in .
- symbol is attached
- FIG. 5 is a cross-sectional view schematically showing a state in which a light-emitting element provided on a substrate and having a rubber layer on an electrode surface and an anisotropic conductive adhesive layer on a wiring substrate are opposed to each other. As shown in FIG. 5, first, in the landing step (A2), the chip component substrate 10 and the wiring substrate 30 are opposed to each other.
- the chip component substrate 10 includes a base material 11, a release material 12, and light emitting elements 20, and the light emitting elements 20 are attached to the surface of the release material 12.
- a rubber layer 51 is attached to the electrode surface of the light emitting element 20 . Since the rubber layer 51 is the same as the rubber layer 41 in the first embodiment, description thereof is omitted.
- connection film 50 consists of an anisotropic conductive adhesive layer 52 and is attached to positions above the first electrode 32 and the second electrode 33 of the wiring board 30 .
- the anisotropic conductive adhesive layer 22 is the same as the anisotropic conductive adhesive layer 42 in the first embodiment, so description thereof is omitted.
- the rubber layer 51 attached to the light-emitting element 20 reduces the impact when the light-emitting element 20 struck at an ultra-high speed hits the anisotropic conductive adhesive layer 52, and the light-emitting element 20 It is possible to suppress the occurrence of defects such as misalignment, deformation, breakage, and missing, and obtain a high success rate of landing.
- connection step (B2) In the connection step (B2), the light emitting elements 20 arranged at predetermined positions on the wiring board 30 are mounted.
- the method of thermocompression bonding the light emitting element 20 to the wiring substrate 30 is the same as in the first embodiment.
- the rubber layer 51 attached to the light emitting element 20 is broken through by the first conductivity type electrode 22 and the second conductivity type electrode 23 of the light emitting element 20 during thermocompression bonding.
- the conductive particles 53 of the anisotropic conductive adhesive layer 52 are between the first conductivity type electrode 22 and the second conductivity type electrode 23 of the light emitting element 20 and the first electrode 32 and the second electrode 33 of the wiring substrate 30.
- the anisotropic conductive film is formed by sandwiching and hardening the binder of the anisotropic conductive adhesive layer 52 .
- the rubber layer is arranged on the electrode surface of the chip component, the connection film made of the adhesive layer is arranged on the electrode surface of the wiring board, and the rubber layer is connected.
- the film By colliding with the film, it is possible to suppress the occurrence of defects such as misalignment, deformation, destruction, and removal of chip parts in the landing process, and to transfer and arrange chip parts with high accuracy and high efficiency.
- the chip component breaks through the rubber layer, and excellent conductivity can be obtained.
- connection film having the rubber layer and the adhesive layer is arranged on the wiring board, but the connection film may be arranged on the electrode surface of the chip component.
- the chip component provided on the base material having transparency to the laser beam is opposed to the wiring board, and the laser beam is emitted from the base material side. and a connecting step of connecting the chip component and the wiring board via a connecting film, wherein the connecting film connects the rubber layer and the adhesive layer.
- the connection film is arranged on the electrode surface of the chip component, and the rubber layer and the electrode surface of the wiring board are brought into contact with each other.
- a method of manufacturing a connection structure a method of manufacturing a display device in which a plurality of light emitting elements, which are LED chips, are arranged on a wiring substrate, which is a panel substrate, to form a light emitting element array.
- the landing step (A3) and the connecting step (B3) in .
- symbol is attached
- FIG. 6 is a cross-sectional view schematically showing a state in which a light-emitting element provided on a substrate and having a connection film on an electrode surface and a wiring substrate are opposed to each other. As shown in FIG. 6, first, in the landing step (A2), the chip component substrate 10 and the wiring substrate 30 are opposed to each other.
- the chip component substrate 10 includes a base material 11, a release material 12, and light emitting elements 20, and the light emitting elements 20 are attached to the surface of the release material 12.
- a connection film 60 is attached to the electrode surface of the light emitting element 20 .
- the connection film 60 has a rubber layer 61 and an anisotropic conductive adhesive layer 62 , and the rubber layer 61 side faces the wiring board 30 . Since the rubber layer 61 and the anisotropic conductive adhesive layer 62 are the same as the rubber layer 41 and the anisotropic conductive adhesive layer 42 in the first embodiment, description thereof is omitted.
- the rubber layer 61 to which the light-emitting element 20 is attached mitigates the impact when the light-emitting element 20 hits the electrode surface of the wiring board 30, which is ejected at a very high speed. It is possible to suppress the occurrence of defects such as misalignment, deformation, breakage, and omission, and obtain a high success rate of landing.
- connection step (B3) In the connection step (B3), the light emitting elements 20 arranged at predetermined positions on the wiring board 30 are mounted.
- the method of thermocompression bonding the light emitting element 20 to the wiring substrate 30 is the same as in the first embodiment.
- the rubber layer 61 attached to the light emitting element 20 is pierced by the conductive particles 63 of the anisotropic conductive adhesive layer 62 during thermocompression bonding.
- the conductive particles 63 of the anisotropic conductive adhesive layer 62 are between the first conductivity type electrode 22 and the second conductivity type electrode 23 of the light emitting element 20 and the first electrode 32 and the second electrode 33 of the wiring substrate 30.
- the anisotropic conductive film is formed by sandwiching and hardening the binder of the anisotropic conductive adhesive layer 62 .
- connection film having the rubber layer and the adhesive layer is arranged on the electrode surface of the chip component, and the rubber layer and the electrode surface of the wiring board are caused to collide.
- defects such as misalignment, deformation, destruction, and removal of chip parts in the landing process, and to transfer and arrange chip parts with high accuracy and high efficiency. You can get sex.
- connection film having the rubber layer and the adhesive layer is arranged on the wiring board, but the adhesive layer may be arranged on the electrode surface of the chip component and the rubber layer may be arranged on the wiring board.
- a chip component provided on a base material having transparency to laser light and a wiring board are opposed to each other, and the laser light is emitted from the base material side. and a connecting step of connecting the chip component and the wiring board via a connecting film, wherein the connecting film has an adhesive layer and the wiring
- the substrate has a rubber layer on the electrode surface, and in the landing step, the connection film is arranged on the electrode surface of the chip component, and the adhesive layer and the rubber layer of the wiring substrate are caused to collide.
- a method of manufacturing a connection structure a method of manufacturing a display device in which a plurality of light emitting elements, which are LED chips, are arranged on a wiring substrate, which is a panel substrate, to form a light emitting element array.
- the landing step (A4) and the connecting step (B4) in .
- symbol is attached
- FIG. 7 is a cross-sectional view schematically showing a state in which a light-emitting element provided on a substrate and having an anisotropic conductive adhesive layer on an electrode surface faces a rubber layer on a wiring board. As shown in FIG. 7, first, in the landing step (A4), the chip component substrate 10 and the wiring substrate 30 are opposed to each other.
- the chip component substrate 10 includes a base material 11, a release material 12, and light emitting elements 20, and the light emitting elements 20 are attached to the surface of the release material 12.
- a connection film 70 made of an anisotropic conductive adhesive layer 72 is attached to the electrode surface of the light emitting element 20 .
- the anisotropic conductive adhesive layer 72 is the same as the anisotropic conductive adhesive layer 42 in the first embodiment, so description thereof is omitted.
- rubber layers 71 are attached to positions above the first electrode 32 and the second electrode 33 of the wiring board 30 . Since the rubber layer 71 is the same as the rubber layer 41 in the first embodiment, the description is omitted.
- the rubber layer 71 affixed to the wiring board 30 mitigates the impact when the light emitting element 20 hits at an ultra-high speed, and prevents the light emitting element 20 from shifting, deforming, breaking, or coming off. It is possible to suppress the occurrence of such defects and obtain a high landing success rate.
- connection step (B4) In the connection step (B4), the light emitting elements 20 arranged at predetermined positions on the wiring board 30 are mounted.
- the method of thermocompression bonding the light emitting element 20 to the wiring substrate 30 is the same as in the first embodiment.
- the rubber layer 71 attached to the wiring board 30 is pierced by the conductive particles 73 of the anisotropic conductive adhesive layer 72 during thermocompression bonding.
- the conductive particles 73 of the anisotropic conductive adhesive layer 72 are between the first conductivity type electrode 22 and the second conductivity type electrode 23 of the light emitting element 20 and the first electrode 32 and the second electrode 33 of the wiring substrate 30.
- the anisotropic conductive film is formed by sandwiching and hardening the binder of the anisotropic conductive adhesive layer 72 .
- connection film made of the adhesive layer is arranged on the electrode surface of the chip component, the rubber layer is arranged on the electrode surface of the wiring board, and the adhesive layer and the rubber are arranged.
- colliding with the layer it is possible to suppress the occurrence of defects such as misalignment, deformation, breakage, and removal of chip parts in the landing process, and to transfer and arrange chip parts with high accuracy and high efficiency. , excellent conductivity can be obtained.
- the connecting film according to this embodiment has a rubber layer and an adhesive layer, and the thickness of the rubber layer is 0.5 ⁇ m or more and 3.0 ⁇ m or less. As a result, it is possible to improve the landing rate when the chip component is made to land on the wiring board using mass transfer using laser light, for example, and to obtain excellent conductivity.
- the adhesive layer is preferably an anisotropic conductive adhesive layer containing conductive particles. This makes it possible to connect the chip component and the wiring board even when the chip component is not provided with connection portions such as solder bumps.
- the anisotropic conductive adhesive layer is preferably configured by aligning the conductive particles in the direction, and the conductive particles are preferably unevenly distributed on the wiring substrate side in the thickness direction. As a result, it is possible to improve the catching property of the conductive particles between the electrodes of the chip component and the electrodes of the wiring board.
- the adhesive layer does not need to contain conductive particles.
- FIG. 8 is a cross-sectional view schematically showing a first structural example of the connecting film.
- the connection film 40 has a rubber layer 41 and an anisotropic conductive adhesive layer 42 containing conductive particles 43 .
- the rubber layer 41 is not particularly limited as long as it is an elastomer having high cushioning properties (shock absorption). Specific examples include silicone rubber, acrylic rubber, butadiene rubber, polyurethane resin (polyurethane-based elastomer), and the like. can be mentioned. Among these, the rubber layer 41 is preferably one or more selected from silicone rubber and acrylic rubber.
- the thickness of the rubber layer 41 is preferably 0.5 ⁇ m or more and 3.0 ⁇ m or less, more preferably 0.5 ⁇ m or more and 2.0 ⁇ m or less, and still more preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less. If the thickness of the rubber layer 41 is too small, it tends to be difficult to obtain impact absorption, and if the thickness of the rubber layer 41 is too small, it tends to be difficult to obtain conductivity.
- the durometer A hardness of the rubber layer 41 is preferably 20-40, more preferably 20-35, still more preferably 20-30. If the durometer A hardness is too high, the rubber layer is too hard, and defects such as deformation and breakage of the chip parts tend to occur easily. Defects such as misalignment of parts tend to occur more easily.
- the durometer A hardness of the rubber layer 41 conforms to JIS K 6253 and can be measured using a durometer A (Japanese Industrial Standard JIS-A hardness).
- the storage elastic modulus of the rubber layer 41 at a temperature of 30°C and a frequency of 200 Hz in a dynamic viscoelasticity test using an indentation tester is preferably 60 MPa or less, more preferably 40 MPa or less, and even more preferably 30 MPa or less. If the storage elastic modulus at a temperature of 30° C. and a frequency of 200 Hz is too high, the impact of the chip component ejected at high speed by laser irradiation cannot be absorbed, and the transfer rate of the chip component tends to decrease.
- a frequency of 200 Hz is measured using an indentation tester, for example, using a flat punch with a diameter of 100 ⁇ m, setting a target indentation depth of 1 ⁇ m, and sweeping the frequency range from 1 to 200 Hz. can be measured.
- the anisotropic conductive adhesive layer 42 may be a so-called anisotropic conductive film (ACF: Anisotropic Conductive Film) containing conductive particles 43 .
- ACF Anisotropic Conductive Film
- conductive particles those used in known anisotropic conductive films can be appropriately selected and used. Examples thereof include metal particles such as nickel, copper, silver, gold, palladium and solder, and metal-coated resin particles obtained by coating the surfaces of resin particles such as polyamide and polybenzoguanamine with a metal such as nickel and gold. As a result, even if the chip component is not provided with a connection portion such as a solder bump, conduction is possible.
- the anisotropic conductive adhesive layer 42 is preferably configured by aligning the conductive particles 43 in the plane direction. Since the conductive particles are aligned in the surface direction, the surface density of the particles becomes uniform, and extremely excellent conductivity can be obtained. Moreover, the anisotropic conductive adhesive layer 42 preferably has the conductive particles 43 unevenly distributed on the wiring substrate side in the thickness direction. For example, in the above-described first embodiment, the conductive particles 43 in the anisotropic conductive adhesive layer 42 may be unevenly distributed on the side opposite to the surface of the rubber layer 41, and in the above-described third embodiment. Then, the conductive particles 43 in the anisotropic conductive adhesive layer 42 may be unevenly distributed on the surface side of the rubber layer 41 . As a result, it is possible to improve the catching property of the conductive particles between the electrodes of the chip component and the electrodes of the wiring board.
- the particle size of the conductive particles 43 is not particularly limited, but the lower limit of the particle size is preferably 1 ⁇ m or more, and the upper limit of the particle size is, for example, 50 ⁇ m from the viewpoint of the efficiency of capturing the conductive particles in the connection structure. It is preferably 20 ⁇ m or less, more preferably 20 ⁇ m or less.
- the particle diameter of the conductive particles can be a value measured by an image type particle size distribution meter (eg, FPIA-3000: manufactured by Malvern). This number is preferably 1000 or more, preferably 2000 or more.
- the particle surface density of the conductive particles can be determined according to the electrode area of the chip component, and can be, for example, in the range of 500 to 140000 pcs/mm 2 .
- the anisotropic conductive adhesive layer 42 is preferably composed of a thermosetting binder containing a film-forming resin, a thermosetting resin, and a curing agent.
- the thermosetting binder is not particularly limited, and examples thereof include a thermal anionic polymerization resin composition containing an epoxy compound and a thermal anionic polymerization initiator, and a thermal cationic polymerization resin composition containing an epoxy compound and a thermal cationic polymerization initiator. and a thermal radical polymerization resin composition containing a (meth)acrylate compound and a thermal radical polymerization initiator.
- the (meth)acrylate compound is meant to include both acrylic monomers (oligomers) and methacrylic monomers (oligomers).
- thermosetting resin contains an epoxy compound and the curing agent is a thermal cationic polymerization initiator.
- the curing reaction due to laser light can be suppressed, and rapid curing can be achieved using heat.
- a thermal cationic polymerizable resin composition containing a film-forming resin, an epoxy compound, and a thermal cationic polymerization initiator will be described as an example.
- the film-forming resin corresponds to, for example, a high-molecular-weight resin having an average molecular weight of 10,000 or more, and from the viewpoint of film-forming properties, the average molecular weight is preferably about 10,000 to 80,000.
- Film-forming resins include various resins such as phenoxy resins, polyester resins, polyurethane resins, polyester urethane resins, acrylic resins, polyimide resins, and butyral resins, and these may be used alone or in combination of two or more. may be used. Among these, it is preferable to use a phenoxy resin from the viewpoint of the state of film formation, connection reliability, and the like.
- the content of the film-forming resin in the anisotropic conductive adhesive layer is preferably 20-50 wt %, more preferably 25-45 wt %, still more preferably 30-40 wt %.
- the epoxy compound is not particularly limited as long as it is an epoxy compound having one or more epoxy groups in the molecule.
- a modified epoxy resin may be used.
- a high-purity bisphenol A type epoxy resin can be preferably used.
- the high-purity bisphenol A type epoxy resin for example, the trade name "YL980" manufactured by Mitsubishi Chemical Corporation can be mentioned.
- the content of the epoxy compound in the anisotropic conductive adhesive layer is preferably 10 to 55 wt%, more preferably 15 to 50 wt%, still more preferably 20 to 45 wt%.
- thermal cationic polymerization initiator those known as thermal cationic polymerization initiators for epoxy compounds can be employed. iodonium salts, sulfonium salts, phosphonium salts, ferrocenes and the like of can be used. Among these, aromatic sulfonium salts that exhibit good latency with respect to temperature can be preferably used.
- aromatic sulfonium salt-based polymerization initiator is “SI-60L” (trade name) manufactured by Sanshin Chemical Industry Co., Ltd.
- the content of the thermal cationic polymerization initiator in the anisotropic conductive adhesive layer is preferably 1 to 20 wt%, more preferably 2 to 15 wt%, still more preferably 3 to 12 wt%.
- thermosetting binder inorganic fillers, silane coupling agents, diluent monomers, fillers, softeners, coloring agents, flame retardants, thixotropic agents, etc. may be blended.
- inorganic fillers silica, talc, titanium oxide, calcium carbonate, magnesium oxide, etc. can be used.
- the inorganic fillers may be used alone or in combination of two or more.
- the content of the inorganic filler in the anisotropic conductive adhesive layer is preferably 1 to 30 wt%, more preferably 5 to 25 wt%, still more preferably 10 to 20 wt%.
- the total content of the inorganic fillers in the thermosetting binder is preferably within the range described above.
- the lower limit of the thickness of the anisotropic conductive adhesive layer 42 may be, for example, the same as the particle diameter of the conductive particles, preferably 1.3 times or more the conductive particle diameter or 3 ⁇ m or more.
- the upper limit of the thickness of the connecting film can be, for example, 20 ⁇ m or less or twice the particle diameter of the conductive particles or less.
- the connecting film may be laminated with an adhesive layer or a pressure-sensitive adhesive layer that does not contain conductive particles, and the number of layers and the laminated surface can be appropriately selected according to the object and purpose.
- the insulating resin for the adhesive layer and pressure-sensitive adhesive layer the same materials as those used for the connection film can be used.
- the film thickness can be measured using a known micrometer or digital thickness gauge. The film thickness may be obtained by measuring, for example, 10 or more points and averaging them.
- the rubber layer preferably has voids inside, and preferably has a shape such as a net shape or a projection shape.
- the air layer improves impact absorption, and the impact rate of the chip component can be improved.
- the chip parts can easily break through the rubber layer when connecting the chip parts, excellent conduction resistance can be obtained.
- FIG. 9(A) is a plan view showing two rubber layers having voids therein due to processing
- FIG. 9(B) is a cross-sectional view schematically showing a second structural example of the connecting film.
- a connection film 80 as a second structural example has a rubber layer 81 and an anisotropic conductive adhesive layer 82 containing conductive particles 83 .
- the rubber layer 81 is formed by laminating a first rubber layer 81A and a second rubber layer 81B, and has a net shape (mesh type), for example.
- a plurality of holes are formed on the surfaces of the first rubber layer 81A and the second rubber layer 81B, for example, by curing the rubber using a plurality of convex molds.
- the rubber layer 81 may be, for example, a porous layer instead of the mesh type.
- the anisotropic conductive adhesive layer 82 is the same as the anisotropic conductive adhesive layer 42, so description thereof is omitted.
- FIG. 10 is a cross-sectional view schematically showing a third configuration example of the connecting film.
- a connection film 90 as a third structural example has a rubber layer 91 and an anisotropic conductive adhesive layer 92 containing conductive particles 93 .
- the rubber layer 91 has, for example, a projection shape (protrusion type), and a plurality of holes are formed on the surface thereof by curing the rubber using, for example, a plurality of convex molds.
- the anisotropic conductive adhesive layer 92 is the same as the anisotropic conductive adhesive layer 42, so description thereof is omitted.
- the rubber layer has voids inside, which improves impact absorption and improves the impact rate of chip parts.
- the penetration resistance of the rubber layer is improved, and excellent conduction resistance can be obtained.
- Example> In the examples, the chip component provided on the quartz glass and the connecting film provided on the glass substrate were opposed to each other, and the chip component was made to hit the connecting film by irradiating a laser beam from the base material side, and the impact elasticity was evaluated. did. Also, a connection structure was produced and the conductivity was evaluated. Note that the present technology is not limited to these examples.
- Phenoxy resin (trade name: PKHH, manufactured by Tomoe Chemical Industry Co., Ltd.) High-purity bisphenol A type epoxy resin (trade name: YL-980, manufactured by Mitsubishi Chemical Corporation) Hydrophobic silica (trade name: RY200, manufactured by Nippon Aerosil Co., Ltd.) Cationic polymerization initiator (trade name: SI-60L, manufactured by Sanshin Chemical Industry Co., Ltd.) Conductive particles (average particle size 3 ⁇ m, resin core metal-coated fine particles, Ni plating 0.2 ⁇ m thick, manufactured by Sekisui Chemical Co., Ltd.)
- anisotropic conductive adhesive layer As shown in Table 2, predetermined parts by mass of each material were blended to prepare an anisotropic conductive adhesive layer with a thickness of 6 ⁇ m on a glass substrate with a thickness of 0.5 mm.
- anisotropic conductive adhesive layer conductive particles were aligned on one side of the binder layer by the method described in Japanese Patent No. 6187665 so that the particle surface density was 58000 pcs/mm 2 .
- Chip parts (outer dimensions: 30 ⁇ 50 ⁇ m, thickness: 5 ⁇ m, electrode thickness: 2 ⁇ m) were made by TEG (Test Element Group), and a release material (polyimide) was provided between quartz glass and the chip parts.
- the wrist device includes a telescope that converts the pulsed laser beam emitted from the laser device into parallel beams, a shaping optical system that uniformly shapes the spatial intensity distribution of the pulsed laser beam that has passed through the telescope, and a shaping optical system.
- a projection lens is provided, a quartz substrate as a donor substrate holding a chip component with a release material is held on the donor stage, a glass substrate as a receptor substrate with a connection film attached is held on the receptor stage, and a chip is mounted on the donor stage.
- the distance between the component and the connecting film was 100 ⁇ m.
- An excimer laser having an oscillation wavelength of 248 nm was used as a laser device.
- the pulse energy of the laser light was 600 J
- the fluence was 150 J/cm 2
- the pulse width (irradiation time) was 30000 picoseconds
- the pulse frequency was 0.01 kHz
- the number of irradiation pulses was 1 pulse for each ACF piece.
- the pulse energy of the imaged laser light irradiated to the interface between the anisotropic conductive adhesive layer and the substrate is 0.001 to 2 J
- the fluence is 0.001 to 2 J/cm 2 .
- the pulse width (irradiation time) was 0.01 to 1 ⁇ 10 9 picoseconds
- the pulse frequency was 0.1 to 10000 Hz
- the number of irradiation pulses was 1 to 30,000,000. .
- a pattern was used in which windows of a predetermined size were arranged at a predetermined pitch so that the projection on the interface between the quartz glass, which was the donor substrate, and the release material was 30 ⁇ 50 ⁇ m in the outline of the chip component.
- a total of 100 chip parts were transferred to the connection film, and the number of chip parts that landed normally on the connection film was counted using a microscope. It is desirable that the percentage of chip components that land normally is 90% or more.
- connection structure The chip component was landed on the connection film of the wiring substrate, and was thermocompression bonded under the conditions of temperature 170° C.-pressure 10 MPa-time 30 sec to fabricate a connection structure.
- a chip part (outer shape: 50 ⁇ m ⁇ 50 ⁇ m, thickness: 150 ⁇ m) was used by TEG (Test Element Group) in which a pair of electrodes (Cr/Au-plated bumps: 12 ⁇ m ⁇ 12 ⁇ m) were provided on the chip part.
- a glass substrate (thickness: 0.5 mm, Ti/Al/Ti pattern: 12 ⁇ m ⁇ 12 ⁇ m) was used as the wiring substrate.
- Example 1 After applying silicone (trade name: STP-106T-UV, manufactured by Shin-Etsu Chemical Co., Ltd.), UV (ultraviolet) curing was performed to prepare a silicone rubber layer having a thickness of 1 ⁇ m. Then, a silicone rubber layer with a thickness of 1 ⁇ m was attached to the surface of the anisotropic conductive adhesive layer with a thickness of 6 ⁇ m to form a connecting film.
- silicone trade name: STP-106T-UV, manufactured by Shin-Etsu Chemical Co., Ltd.
- the silicone rubber was measured for rubber hardness (Japanese Industrial Standard JIS-A hardness) using a durometer A in accordance with JIS K 6253. As a result, the rubber hardness was 30.
- a dynamic viscoelasticity test was performed on the silicone rubber using an indentation tester (iMicro nanoindenter manufactured by KLA). A flat punch with a diameter of 100 ⁇ m was used, the target indentation depth was set to 1 ⁇ m, the frequency range of 1 to 200 Hz was swept, and the storage modulus was measured at a temperature of 30° C. and a frequency of 200 Hz. The Poisson's ratio of the sample was set to 0.5, and the average value of 12 measurement points for each sample was calculated. As a result, the storage elastic modulus was 27 MPa.
- the chip landing rate was 98% when the chip component was made to land on the silicone rubber layer of the connecting film.
- the evaluation of the conduction resistance of the connection structure in which the chip component and the wiring substrate were thermocompression-bonded via the connection film was "B".
- Example 2 A connecting film was produced in the same manner as in Example 1, except that a silicone rubber layer having a thickness of 0.5 ⁇ m was produced.
- the chip landing rate was 90% when the chip component landed on the silicone rubber layer of the connecting film.
- the evaluation of the conduction resistance of the connection structure in which the chip component and the wiring substrate were thermocompression-bonded via the connection film was "A".
- Example 3 A connecting film was produced in the same manner as in Example 1, except that a silicone rubber layer having a thickness of 2.0 ⁇ m was produced.
- the chip landing rate was 100% when the chip component landed on the silicone rubber layer of the connecting film.
- the evaluation of the conduction resistance of the connection structure in which the chip component and the wiring substrate were thermocompression-bonded via the connection film was "C".
- Example 4 After applying silicone (trade name: STP-106T-UV, manufactured by Shin-Etsu Chemical Co., Ltd.) to a thickness of 1 ⁇ m, a large number of holes with a diameter of 1 ⁇ m are processed by convex embossing, UV (ultraviolet) curing is performed, and the silicone rubber layer is formed. made. Then, on the surface of the anisotropic conductive adhesive layer with a thickness of 6 ⁇ m, two silicone rubber layers were adjusted and bonded (mesh type) so that the total thickness was 2 ⁇ m, to form a connecting film.
- silicone trade name: STP-106T-UV, manufactured by Shin-Etsu Chemical Co., Ltd.
- the chip landing rate was 100% when the chip component landed on the silicone rubber layer of the connecting film.
- the evaluation of the conduction resistance of the connection structure in which the chip component and the wiring substrate were thermocompression-bonded via the connection film was "A".
- Example 5 After applying silicone (trade name: STP-106T-UV, manufactured by Shin-Etsu Chemical Co., Ltd.) to a predetermined thickness, a large number of holes with a diameter of 1 ⁇ m are processed by convex embossing, UV (ultraviolet) curing, and protrusion height A silicone rubber layer having a thickness of 1 ⁇ m or more and a total thickness of 2 ⁇ m was prepared. Then, a silicone rubber layer was attached (projection type) to the surface of the anisotropic conductive adhesive layer having a thickness of 6 ⁇ m to form a connection film.
- silicone trade name: STP-106T-UV, manufactured by Shin-Etsu Chemical Co., Ltd.
- the chip landing rate was 100% when the chip component landed on the silicone rubber layer of the connecting film.
- the evaluation of the conduction resistance of the connection structure in which the chip component and the wiring substrate were thermocompression-bonded via the connection film was "A".
- the chip landing rate was 20% when the chip component was landed on the anisotropic conductive adhesive layer.
- the evaluation of the conduction resistance of the connection structure in which the chip component and the wiring substrate were thermocompression-bonded via the connection film was "A".
- Silicone (trade name: STP-106T-UV, manufactured by Shin-Etsu Chemical Co., Ltd.) 80 parts by mass, conductive particles (average particle size 3 ⁇ m, resin core metal-coated fine particles, Ni plating 0.2 ⁇ m thickness, Sekisui Chemical Co., Ltd. 20 parts by mass of (manufactured by Fujifilm) was blended, coated on a 0.5 mm-thick glass substrate and UV-cured to prepare a 6 ⁇ m-thick conductive particle-containing silicone rubber layer, which was used as a connecting film.
- STP-106T-UV manufactured by Shin-Etsu Chemical Co., Ltd.
- the chip landing rate was 100% when the chip component was landed on the conductive particle-containing silicone rubber layer.
- the evaluation of the conduction resistance of the connection structure in which the chip component and the wiring board were thermocompression-bonded via the connection film was "D".
- Comparative Example 1 As shown in Table 3, in Comparative Example 1, the chip landing rate was low because the silicone rubber layer was not provided on the anisotropic conductive adhesive layer. In Comparative Example 2, the conductive particle-containing silicone rubber layer was used as the connecting film, so the evaluation of the conduction resistance was poor.
- Examples 1 to 5 since the silicone rubber layer was provided on the anisotropic conductive adhesive layer, a high tip landing rate could be obtained. Moreover, in Examples 4 and 5, since the silicone rubber layer has internal voids such as a mesh type or a projection type, the chip component can easily break through the silicone rubber layer, and a good evaluation of the conduction resistance was obtained. .
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Abstract
Description
1.接続構造体の製造方法
2.接続フィルム
3.実施例
[第1の実施の形態]
第1の実施の形態に係る接続構造体の製造方法は、レーザー光に対して透過性を有する基材に設けられたチップ部品と、配線基板とを対向させ、基材側からレーザー光を照射してチップ部品を前記配線基板側に着弾させる着弾工程と、チップ部品と前記配線基板とを、接続フィルムを介して接続させる接続工程とを有し、接続フィルムが、ゴム層と接着層とを有し、着弾工程では、配線基板の電極面に接続フィルムが配置され、ゴム層とチップ部品の電極面とを衝突させる。これにより、着弾工程において、チップ部品のずれ、変形、破壊、抜けなどの不良の発生を抑制し、チップ部品を高精度及び高効率に転写、配列させることができ、接続工程において、チップ部品がゴム層を突き破り、優れた導通性を得ることができるため、タクトタイムの短縮化を図ることができる。
図1は、基材に設けられた発光素子と、配線基板上の接続フィルムとを対向させた状態を模式的に示す断面図であり、図2は、対向させた発光素子と配線基板上の接続フィルムとを示す拡大図である。図1及び図2に示すように、先ず、着弾工程(A1)では、チップ部品基板10と配線基板30とを対向させる。
図4は、配線基板に発光素子を実装させた状態を模式的に示す断面図である。図4に示すように、接続工程(B1)では、配線基板30の所定位置に配列した発光素子20を実装させる。
第1の実施の形態では、ゴム層と接着層とを有する接続フィルムを配線基板に配置したが、ゴム層をチップ部品の電極面に配置し、接着層を配線基板に配置してもよい。
図5は、基材に設けられ、電極面にゴム層を有する発光素子と、配線基板上の異方性導電接着層とを対向させた状態を模式的に示す断面図である。図5に示すように、先ず、着弾工程(A2)では、チップ部品基板10と配線基板30とを対向させる。
接続工程(B2)では、配線基板30の所定位置に配列した発光素子20を実装させる。発光素子20を配線基板30に熱圧着する方法は、第1の実施の形態と同様である。発光素子20に貼り付けられたゴム層51は、熱圧着時に発光素子20の第1導電型電極22及び第2導電型電極23により突き破られる。そして、異方性導電接着層52の導電粒子53が発光素子20の第1導電型電極22及び第2導電型電極23と、配線基板30の第1電極32及び第2電極33との間に挟持され、異方性導電接着層52のバインダーが硬化することにより、異方性導電膜が形成される。
第1の実施の形態では、ゴム層と接着層とを有する接続フィルムを配線基板に配置したが、接続フィルムをチップ部品の電極面に配置してもよい。
図6は、基材に設けられ、電極面に接続フィルムを有する発光素子と、配線基板とを対向させた状態を模式的に示す断面図である。図6に示すように、先ず、着弾工程(A2)では、チップ部品基板10と配線基板30とを対向させる。
接続工程(B3)では、配線基板30の所定位置に配列した発光素子20を実装させる。発光素子20を配線基板30に熱圧着する方法は、第1の実施の形態と同様である。発光素子20に貼り付けられたゴム層61は、熱圧着時に異方性導電接着層62の導電粒子63により突き破られる。そして、異方性導電接着層62の導電粒子63が発光素子20の第1導電型電極22及び第2導電型電極23と、配線基板30の第1電極32及び第2電極33との間に挟持され、異方性導電接着層62のバインダーが硬化することにより、異方性導電膜が形成される。
第1の実施の形態では、ゴム層と接着層とを有する接続フィルムを配線基板に配置したが、接着層をチップ部品の電極面に配置し、ゴム層を配線基板に配置してもよい。
図7は、基材に設けられ、電極面に異方性導電接着層を有する発光素子と、配線基板上のゴム層とを対向させた状態を模式的に示す断面図である。図7に示すように、先ず、着弾工程(A4)では、チップ部品基板10と配線基板30とを対向させる。
接続工程(B4)では、配線基板30の所定位置に配列した発光素子20を実装させる。発光素子20を配線基板30に熱圧着する方法は、第1の実施の形態と同様である。配線基板30に貼り付けられたゴム層71は、熱圧着時に異方性導電接着層72の導電粒子73により突き破られる。そして、異方性導電接着層72の導電粒子73が発光素子20の第1導電型電極22及び第2導電型電極23と、配線基板30の第1電極32及び第2電極33との間に挟持され、異方性導電接着層72のバインダーが硬化することにより、異方性導電膜が形成される。
本実施の形態に係る接続フィルムは、ゴム層と、接着層とを有し、ゴム層の厚みが、0.5μm以上3.0μm以下である。これにより、例えばレーザー光によるマストランスファーを用いてチップ部品を配線基板に着弾させる場合の着弾率を向上させ、優れた導通性を得ることができる。
第1の構成例において、ゴム層は、内部に空隙を有することが好ましく、網状、突起状などの形状であることが好ましい。これにより、空気層により衝撃吸収性が向上し、チップ部品の着弾率を向上させることができる。また、チップ部品の接続時に、チップ部品がゴム層を突き破り易くなるため、優れた導通抵抗を得ることができる。
実施例では、石英ガラスに設けられたチップ部品とガラス基板に設けられた接続フィルムとを対向させ、基材側からレーザー光を照射してチップ部品を接続フィルム上に着弾させ、着弾性を評価した。また、接続構造体を作製し、導通性を評価した。なお、本技術は、これらの実施例に限定されるものではない。
下記材料を準備した。
フェノキシ樹脂(商品名:PKHH、巴化学工業株式会社製)
高純度ビスフェノールA型エポキシ樹脂(商品名:YL-980、三菱ケミカル株式会社製)
疎水性シリカ(商品名:RY200、日本アエロジル株式会社製)
カチオン重合開始剤(商品名:SI-60L、三新化学工業株式会社製)
導電粒子(平均粒径3μm、樹脂コア金属被覆微粒子、Niメッキ0.2μm厚、積水化学工業株式会社製)
リスト装置(MT-30C200)を用いて、石英ガラスに設けられたチップ部品をガラス基板上の接続フィルムに着弾させた。チップ部品(外形30×50μm、厚み5μm、電極厚み2μm)は、TEG(Test Element Group)を用い、石英ガラスとチップ部品との間にリリース材(ポリイミド)を設けた。
チップ部品を配線基板の接続フィルム上に着弾させ、温度170℃-圧力10Mpa-時間30secの条件で熱圧着し、接続構造体を作製した。チップ部品(外形50μm×50μm、厚み150μm)は、チップ部品に1対の電極(Cr/Au-plated bump 12μm×12μm)設けているTEG(Test Element Group)を用いた。配線基板は、ガラス基板(厚み0.5mm、Ti/Al/Ti pattern 12μm×12μm)を用いた。
配線基板側の導通配線を用いて、接続構造体の導通抵抗を測定した。導通性の評価は、抵抗値に応じて下記A~Dの判定とした。C判定以上あることが望まれる。
A:50Ω以下
B:50Ω超100Ω以下
C:100Ω超200Ω以下
D:200Ω超
シリコーン(商品名:STP-106T-UV、信越化学工業株式会社製)を塗布した後、UV(ultraviolet)硬化させ、厚み1μmのシリコーンゴム層を作製した。そして、厚み6μmの異方性導電接着層の表面に、厚み1μmのシリコーンゴム層を貼り合わせ、接続フィルムとした。
厚み0.5μmのシリコーンゴム層を作製した以外は、実施例1と同様に接続フィルムを作製した。
厚み2.0μmのシリコーンゴム層を作製した以外は、実施例1と同様に接続フィルムを作製した。
シリコーン(商品名:STP-106T-UV、信越化学工業株式会社製)を厚み1μm塗布した後、凸型のエンボスで直径1μmの穴を多数加工し、UV(ultraviolet)硬化させ、シリコーンゴム層を作製した。そして、厚み6μmの異方性導電接着層の表面に、合計厚みが2μmとなるように2枚のシリコーンゴム層を調整して貼り合わせ(メッシュ型)、接続フィルムとした。
シリコーン(商品名:STP-106T-UV、信越化学工業株式会社製)を所定厚みに塗布した後、凸型のエンボスで直径1μmの穴を多数加工し、UV(ultraviolet)硬化させ、突起高さが1μm以上、合計厚みが2μmとなるシリコーンゴム層を作製した。そして、厚み6μmの異方性導電接着層の表面に、シリコーンゴム層を貼り合わせ(突起型)、接続フィルムとした。
異方性導電接着層の表面にシリコーンゴム層を貼り合わせず、厚み6μmの異方性導電接着層のみを接続フィルムとした。
シリコーン(商品名:STP-106T-UV、信越化学工業株式会社製)80質量部に対し、導電粒子(平均粒径3μm、樹脂コア金属被覆微粒子、Niメッキ0.2μm厚、積水化学工業株式会社製)を20質量部配合し、厚み0.5mmのガラス基板上に塗布・UV硬化させ、厚み6μmの導電粒子含有シリコーンゴム層を作製し、これを接続フィルムとした。
Claims (19)
- レーザー光に対して透過性を有する基材に設けられたチップ部品と、配線基板とを対向させ、前記基材側からレーザー光を照射して前記チップ部品を前記配線基板側に着弾させる着弾工程と、
前記チップ部品と前記配線基板とを、接続フィルムを介して接続させる接続工程とを有し、
前記接続フィルムが、ゴム層と接着層とを有し、
前記着弾工程では、前記配線基板の電極面に前記接続フィルムが配置され、前記ゴム層と前記チップ部品の電極面とを衝突させる接続構造体の製造方法。 - レーザー光に対して透過性を有する基材に設けられたチップ部品と、配線基板とを対向させ、前記基材側からレーザー光を照射して前記チップ部品を前記配線基板側に着弾させる着弾工程と、
前記チップ部品と前記配線基板とを、接続フィルムを介して接続させる接続工程とを有し、
前記接続フィルムが、接着層を有し、
前記チップ部品が、電極面にゴム層を有し、
前記着弾工程では、前記配線基板の電極面に前記接続フィルムが配置され、前記接着層と前記チップ部品のゴム層とを衝突させる接続構造体の製造方法。 - レーザー光に対して透過性を有する基材に設けられたチップ部品と、配線基板とを対向させ、前記基材側からレーザー光を照射して前記チップ部品を前記配線基板側に着弾させる着弾工程と、
前記チップ部品と前記配線基板とを、接続フィルムを介して接続させる接続工程とを有し、
前記接続フィルムが、ゴム層と接着層とを有し、
前記着弾工程では、前記チップ部品の電極面に前記接続フィルムが配置され、前記ゴム層と前記配線基板の電極面とを衝突させる接続構造体の製造方法。 - レーザー光に対して透過性を有する基材に設けられたチップ部品と、配線基板とを対向させ、前記基材側からレーザー光を照射して前記チップ部品を前記配線基板側に着弾させる着弾工程と、
前記チップ部品と前記配線基板とを、接続フィルムを介して接続させる接続工程とを有し、
前記接続フィルムが、接着層を有し、
前記配線基板が、電極面にゴム層を有し、
前記着弾工程では、前記チップ部品の電極面に前記接続フィルムが配置され、前記接着層と前記配線基板のゴム層とを衝突させる接続構造体の製造方法。 - 前記ゴム層が、アクリルゴム、シリコーンゴムから選択される1種以上である請求項1乃至4のいずれか1項に記載の接続構造体の製造方法。
- 前記ゴム層の厚みが、0.5μm以上3.0μm以下である請求項1乃至5のいずれか1項に記載の接続構造体の製造方法。
- 前記ゴム層が、内部に空隙を有する請求項1乃至6のいずれか1項に記載の接続構造体の製造方法。
- 前記ゴム層のデュロメータA硬度が、20~40であり、押し込み試験装置を用いた動的粘弾性試験の温度30℃、周波数200Hzにおける貯蔵弾性率が、60MPa以下である請求項1乃至7のいずれか1項に記載の接続構造体の製造方法。
- 前記接着層が、膜形成樹脂と、熱硬化性樹脂と、硬化剤とを含有する請求項1乃至8のいずれか1項に記載の接続構造体の製造方法。
- 前記接着層が、導電粒子を含有する請求項1乃至9のいずれか1項に記載の接続構造体の製造方法。
- 前記接着層が、前記導電粒子を面方向に整列して構成されている請求項10記載の接続構造体の製造方法。
- 前記チップ部品が、発光素子である請求項1乃至11のいずれか1項に記載の接続構造体の製造方法。
- ゴム層と、接着層とを有し、
前記ゴム層の厚みが、0.5μm以上3.0μm以下である接続フィルム。 - 前記ゴム層が、アクリルゴム、シリコーンゴムから選択される1種以上である請求項13記載の接続フィルム。
- 前記ゴム層が、内部に空隙を有する請求項13又は14記載の接続フィルム。
- 前記ゴム層のデュロメータA硬度が、20~40であり、押し込み試験装置を用いた動的粘弾性試験の温度30℃、周波数200Hzにおける貯蔵弾性率が、60MPa以下である請求項13乃至15のいずれか1項に記載の接続フィルム。
- 前記接着層が、膜形成樹脂と、熱硬化性樹脂と、硬化剤とを含有する請求項13乃至16のいずれか1項に記載の接続フィルム。
- 前記接着層が、導電粒子を含有する請求項13乃至17のいずれか1項に記載の接接続フィルム。
- 前記接着層が、前記導電粒子を面方向に整列して構成されている請求項18記載の接続フィルム。
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JPH0830118A (ja) * | 1994-07-20 | 1996-02-02 | Toray Ind Inc | 中間転写体およびこれを用いた画像形成方法 |
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