WO2008007535A1 - Procédé de montage, structure de montage, procédé de fabrication d'équipement électronique, équipement électronique, procédé de fabrication d'affichage à diode électroluminescente et affichage à diode électroluminescente - Google Patents
Procédé de montage, structure de montage, procédé de fabrication d'équipement électronique, équipement électronique, procédé de fabrication d'affichage à diode électroluminescente et affichage à diode électroluminescente Download PDFInfo
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- WO2008007535A1 WO2008007535A1 PCT/JP2007/062724 JP2007062724W WO2008007535A1 WO 2008007535 A1 WO2008007535 A1 WO 2008007535A1 JP 2007062724 W JP2007062724 W JP 2007062724W WO 2008007535 A1 WO2008007535 A1 WO 2008007535A1
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- Prior art keywords
- viscosity
- mounting
- emitting diode
- light emitting
- move
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/30—Die-attach connectors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistors
- H05K3/303—Assembling printed circuits with electric components, e.g. with resistors with surface mounted components
- H05K3/305—Affixing by adhesive
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/852—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W70/00—Package substrates; Interposers; Redistribution layers [RDL]
- H10W70/60—Insulating or insulated package substrates; Interposers; Redistribution layers
- H10W70/67—Insulating or insulated package substrates; Interposers; Redistribution layers characterised by their insulating layers or insulating parts
- H10W70/68—Shapes or dispositions thereof
- H10W70/682—Shapes or dispositions thereof comprising holes having chips therein
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/01—Manufacture or treatment
- H10W72/013—Manufacture or treatment of die-attach connectors
- H10W72/01308—Manufacture or treatment of die-attach connectors using permanent auxiliary members, e.g. using alignment marks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/071—Connecting or disconnecting
- H10W72/073—Connecting or disconnecting of die-attach connectors
- H10W72/07311—Treating the bonding area before connecting, e.g. by applying flux or cleaning
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/071—Connecting or disconnecting
- H10W72/073—Connecting or disconnecting of die-attach connectors
- H10W72/07321—Aligning
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/30—Die-attach connectors
- H10W72/381—Auxiliary members
- H10W72/387—Flow barriers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/90—Bond pads, in general
- H10W72/931—Shapes of bond pads
Definitions
- Mounting method mounting structure, electronic device manufacturing method, electronic device, light emitting diode display manufacturing method, and light emitting diode display
- the present invention relates to a mounting method, a mounting structure, an electronic device manufacturing method, an electronic device, a light emitting diode display manufacturing method, and a light emitting diode display.
- the positional accuracy of each pixel of the display is generally required to be about ⁇ of the pixel pitch from the viewpoint of screen uniformity. For this reason, a display manufactured by mounting a self-luminous element such as a light emitting diode on a substrate requires mounting position accuracy of about 1/100 of the pixel pitch. For example, in a 40-inch diagonal full HD (High Definition) high-definition full-color display, the number of pixels in the horizontal direction of the screen is 1920 and the number of pixels in the vertical direction of the screen is 1080, so the pixel pitch is 0.461 mm. Therefore, the required mounting position accuracy is ⁇ 0.005 mm (5 zm).
- the number of light-emitting elements to be mounted is 1920 x 1080 x (—the number of red (R) green (G) blue (B) three-color light emitting elements used to form a pixel) of about 2 million.
- X the number of RGB three-color light emitting elements used to form a pixel
- the light emission to be formed first A higher mounting position accuracy is required for the element array pitch shift.
- the pitch deviation is set to ⁇ 0.002 mm
- the mounting position accuracy is required to be ⁇ 0.003 mm, which is difficult from the viewpoint of the cost and throughput of the mounting device.
- the viscosity is controlled so that the object can move, and the viscosity of the second part of the object holding layer outside the first part is controlled so that the object cannot move.
- the viscosity of the first part is controlled so that the object cannot move, nothing is disclosed or suggested.
- the problem to be solved by the present invention is a mounting method that can be easily and surely mounted with high positional accuracy when mounting an object such as an element, particularly a minute object, on a substrate, and such a method. It is to provide a mounting structure in which an object is mounted by a simple mounting method.
- Another problem to be solved by the present invention is to provide an electronic device manufacturing method and an electronic device based on the mounting method as described above.
- Still another problem to be solved by the present invention is to provide a method of manufacturing a light emitting diode display and a light emitting diode display based on the mounting method as described above.
- the first invention provides:
- the mounting After mounting the object on the first portion, the mounting is manufactured by performing at least a step of controlling the viscosity of the first portion to a viscosity at which the object cannot move. It is a structure.
- the state in which the first part has a viscosity at which the object can move corresponds to the state in which the first part has fluidity that allows the object to move naturally.
- the viscosity of the second part or the first part is such that the object cannot move, the second part or the first part has almost no fluidity (it is almost cured and the This corresponds to the state where the object cannot move naturally.
- the force to be mounted in the first part is typically one force. In some cases, multiple objects may be mounted. In this case, these objects may be the same or different. It may be. Considering the case where a single object is mounted in the first part, the first part has fluidity, and therefore the first part around the object is raised. At this time, if the center of gravity of the object deviates from the center of gravity of the first part when viewed in the substrate surface, the resultant force of the component parallel to the substrate surface of the surface tension of the first part that contacts the side surface of this object Works on the object. This resultant force is directed toward the center of gravity of the first part, and this resultant force becomes a driving force, and the object automatically (naturally) moves toward the center of gravity of this first part.
- the resultant force decreases.
- the center of gravity of the object coincides with the center of gravity of the first part when viewed in the plane of the board, this resultant force becomes zero and the movement of the object stops.
- the center of gravity of the object can be automatically positioned at the center of gravity of the first part simply by embedding and mounting the object in the first part. That is, the object can be self-aligned (self-aligned) with respect to the first part.
- the first part Viscosity It is effective to lower it.
- the contact angle of the first part with respect to the side surface (end face) of the object should be 90 degrees or less.
- the contact angle of the first part with respect to the side surface (end face) of the object in this state is 90 degrees or less.
- ultrasonic vibration or the like may be applied to the substrate.
- the viscosity of the first portion when the object is movable is, for example, 1 to: lOOOOPa's, but is not limited thereto.
- the viscosity when the viscosity is lowered is not limited to, for example, a force of 0.001 to: lOPa's.
- the viscosity of water at room temperature should be 0.OOlPa • s.
- the first portion is formed to be surrounded by the second portion.
- the plane shape of the first part and the plane shape of the object are preferably determined from the viewpoint of accurately positioning the object at the center of gravity of the first part. They are similar to each other.
- the planar shape of the first part is preferably rotationally symmetric, specifically, a circle, a regular polygon (regular triangle, square, regular pentagon, regular hexagon, etc.), or a modified shape thereof. .
- the planar shape of the first part does not necessarily need to be rotationally symmetric, and may or may not have line symmetry or point symmetry.
- Fig. 1 shows that an object holding layer made of a substance whose viscosity can be controlled is formed on a substrate, and the object moves the viscosity of the first part of the object holding layer including the mounting area of the object.
- the viscosity of the second portion outside the first portion of the object holding layer is controlled to a viscosity at which the object cannot move, and at least one viscosity is set in the first portion.
- the state where the object is embedded and mounted is shown. Let tl be the thickness of the first object-holding layer.
- the area of the first part is Sl
- the area of the bottom of the object is S2
- the height of the object is t2
- the difference in height between the bottom of the object after mounting the object in the first part and the surface of the object holding layer Is expressed as d.
- the first part From the viewpoint of causing a force large enough to move the object toward the center of gravity of the first part due to the surface tension of the surface, it is preferably 1 / S1 / S2 / 100, more preferably 1 ⁇ S 1 / S2 ⁇ 10, more preferably K S1 / S2 ⁇ 5.
- the volume of the object in the part embedded in the first part is S2'd, and the part where the first part around the object is raised by the object excluding the first part
- the volume of is also S2'd.
- the volume of the area indicated by the dotted line in Fig. 3 is expressed as (S1-S2). (T2-d), but the object is moved toward the center of gravity of the first part by the surface tension of the first part.
- (S1—S2) ⁇ (t2-d)> S2 'd is preferable from the viewpoint of ensuring that a force large enough to work is applied.
- Sl' d ⁇ (S1 -S2) -t2.
- the material holding layer that can control viscosity is irradiated with light (especially ultraviolet rays, etc.), radiation (X-rays, etc.), electron beam, etc., and is applied with heat, pressure, electric field, magnetic field, etc. Any material can be used as long as the viscosity can be controlled by any method including the above, but it can be formed easily and the force is easy.
- Those whose viscosity can be controlled are, for example, those composed of a resin layer, especially a photosensitive resin, a thermosetting resin, or a thermoplastic resin.
- the photosensitive resin conventionally known ones can be used.
- the exposed portion becomes hardly soluble due to a photocrosslinking reaction such as polycacinic acid vinyl or polyvinyl azide benzanol, or photopolymerization such as acrylamide.
- a photocrosslinking reaction such as polycacinic acid vinyl or polyvinyl azide benzanol, or photopolymerization such as acrylamide.
- a negative type in which the exposed part becomes insoluble by reaction, or a podine type in which the quinonediazide group, such as o-quinonediazide novolac resin, forms a carboxylic acid by photolysis and becomes readily soluble.
- the thermosetting resin conventionally known ones can be used. Specifically, for example, epoxy resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin, polyurethane resin, polyimide, etc. can be used. it can.
- thermoplastic resin A conventionally well-known thing can be used also as a thermoplastic resin, and, specifically, polyethylene, polystyrene, polychlorinated bur, polyamide, etc. can be used, for example.
- a resin layer made of a photosensitive resin after the resin layer is formed in a fluid state, the second portion is cured by selectively irradiating the second portion with light. That power S.
- the second portion when using a resin layer made of a thermosetting resin, after the resin layer is formed in a fluid state, the second portion is selectively heated by light irradiation or the like. By doing so, the second portion can be cured.
- the resin layer is formed in a state that does not have fluidity, and then the first portion is selectively heated by light irradiation or the like to thereby heat the first portion. 1 part can be melted and fluidized.
- the substance whose viscosity can be controlled may be, for example, a pressure-sensitive resin layer (for example, acrylic type), a metal (single metal and alloy), glass, and the like.
- the object to be mounted on the first part can be basically any object, regardless of shape, size, material, function, application, etc.
- the device typically has any function or application.
- the elements include, for example, light emitting elements (light emitting diodes, semiconductor lasers, electoluminescence (EL) elements, etc.), light receiving elements (photodiodes, CCD sensors, MOS sensors, etc.), electronic elements (IC chips, etc.) Etc.
- these elements include piezoelectric elements, pyroelectric elements, optical elements (such as second harmonic generation elements using nonlinear optical crystals), dielectric elements, etc. (Including ferroelectric elements) and various superconducting elements.
- the object to be mounted on the first part may be a minute part or element used for various types of MEMS (Micro Electro Mechanical Systems) such as an optical encoder.
- MEMS Micro Electro Mechanical Systems
- the size of the object or element (chip size) is not particularly limited. This object or element is typically very small, specifically a force that is, for example, less than lmm or less than 300 ⁇ m or less than 100 ⁇ , for example. is not.
- the first portion is formed on the object holding layer in an arrangement corresponding to the arrangement of these objects.
- the distance between the first portions is, for example, at least 0.1 times the thickness of the object holding layer.
- the arrangement of these objects, and therefore the arrangement of the first part may be regular or irregular.
- a plurality of first portions may be made into a set, and this may be repeated periodically.
- different objects or elements may be mounted on the plurality of first parts of each set, or the same An object or element may be implemented.
- a display when a display is manufactured by mounting a plurality of red light emitting diodes, green light emitting diodes and blue light emitting diodes on a substrate, for example, three first light emitting diodes are manufactured. Make sure that the parts are a set and repeat periodically. In this case, a red light emitting diode, a green light emitting diode, and a blue light emitting diode are mounted on the three first parts of each set.
- these objects may be self-aligned at once, or all the objects to be mounted on the board may be batched. After mounting on the first part, these objects may be self-aligned at once, or after all the objects to be mounted on the board are repeatedly mounted in multiple steps (step mounting or step transfer) These objects may be self-aligned in a lump, or a plurality of types of objects to be mounted on a substrate may be self-aligned after being mounted on the first part.
- an object is mounted on the first part, and after the viscosity of the first part is controlled to a viscosity at which the object cannot move, the viscosity of the first part including at least the object is adjusted.
- the region of the first portion where the viscosity is controlled to a viscosity at which the object can move is selected so that a force for moving the object to the mounting position is generated.
- an object is mounted on the first part of the object holding layer made of a substance whose viscosity can be controlled, and the viscosity of the first part is controlled to a viscosity at which the object cannot move.
- an object holding layer made of a substance whose viscosity can be controlled is formed again thereon, the object is mounted on the first part of the object holding layer, and the viscosity of the first part is increased.
- the process of controlling the viscosity so that the object cannot move may be repeatedly performed. In this way, the object can be mounted in three dimensions.
- the mounting structure may basically have any application or function.
- a light-emitting diode display a light-emitting diode backlight, and a light-emitting diode Lighting devices, EL displays, and electronic devices.
- the third invention provides
- the step of forming an element holding layer having a material force capable of controlling the viscosity on the substrate, and the viscosity of the first part including the element mounting area of the element holding layer to a viscosity at which the element can move are controlled. And controlling the viscosity of the second part of the element holding layer outside the first part to a viscosity at which the element cannot move;
- the fourth invention is:
- the electronic device is manufactured by mounting at least the step of controlling the viscosity of the first portion to a viscosity that the device cannot move after mounting the device on the first portion.
- Equipment
- Electronic devices basically include both portable devices and stationary devices, and specific examples include mobile phones, mopile devices, robots, These include personal computers, in-vehicle devices, and various home appliances.
- the object holding layer, the object mounting area, and the object are read as the element holding layer, the element mounting area, and the element, respectively, unless otherwise contrary to the nature. What has been described in relation to the first and second inventions is valid.
- the fifth invention provides
- Red light emitting diode, green light emitting diode and blue light emitting diode Forming a device holding layer made of a substance capable of controlling the viscosity on the substrate according to a method of manufacturing a light emitting diode display in which a plurality of diodes are mounted on the substrate, and the device holding layer.
- the viscosity of the first part including the mounting region of the light emitting diode is controlled to a viscosity at which the light emitting diode can move, and the second part of the element holding layer outside the first part is controlled. Controlling the viscosity to a viscosity at which the light-emitting diode cannot move;
- a step of controlling the viscosity of the first portion is changed to a viscosity at which the light-emitting diode cannot move.
- the sixth invention provides:
- a light emitting diode display in which a plurality of red light emitting diodes, green light emitting diodes and blue light emitting diodes are mounted on a substrate, an element holding layer made of a substance capable of controlling the viscosity is formed on the substrate.
- the viscosity of the first portion of the element holding layer including the mounting region of the light emitting diode is controlled to a viscosity at which the light emitting diode can move, and outside the first portion of the element holding layer. Controlling the viscosity of the second part to a viscosity at which the light emitting diode cannot move;
- the red light emitting diode for example, the green light emitting diode and the blue light emitting diode
- a nitride-based III-V compound semiconductor is used as the red light emitting diode.
- Can be used as the red light emitting diode for example, a diode using an AlGalnP-based semiconductor can be used.
- the object holding layer, the object mounting area, and the object are designated as the element holding layer, the light emitting diode mounting area, and the light emitting diode, respectively, unless otherwise contrary to the above. In other words, what has been described in relation to the first and second inventions is valid.
- the center of gravity of the object when an object is mounted on the first part, the center of gravity of the object is shifted from the center of gravity of the first part when viewed in the substrate plane. Then, the resultant force of the component of the surface tension of the first part parallel to the substrate surface acts on the object, and this acts as a driving force to move the object toward the center of gravity of the first part.
- This force gradually decreases as the center of gravity of the object approaches the center of gravity of the first part, and becomes zero when the center of gravity of the object matches the center of gravity of the first part. In this way, the object can be automatically positioned accurately at the center of gravity of the first part simply by mounting the object on the first part. That is, the object can be self-aligned with respect to the first part.
- FIG. 1 is a cross-sectional view for explaining a mounting method according to the present invention.
- FIG. 2 is a cross-sectional view for explaining a mounting method according to the present invention.
- FIG. 3 is a cross-sectional view for explaining a mounting method according to the present invention.
- FIG. 4 is a cross-sectional view for explaining the mounting method according to the first embodiment of the present invention.
- FIG. 5 is a cross-sectional view and a plan view for explaining the mounting method according to the first embodiment of the present invention.
- FIG. 6 is a sectional view and a plan view for explaining the mounting method according to the first embodiment of the present invention.
- FIG. 7 is a cross-sectional view and a plan view for explaining the mounting method according to the first embodiment of the present invention.
- FIG. 8 is a drawing-substituting photograph showing a state in which the micro light emitting diode is mounted on the photosensitive resin layer and a state in which the micro light emitting diode is self-aligned thereafter in the mounting method according to the first embodiment of the present invention.
- FIG. 9 In the second embodiment of the present invention, the state in which the microphone port light emitting diode is mounted on the photosensitive resin layer by step transfer, and the micro light emitting diode is self-aligned thereafter. It is a top view which shows the state which became.
- FIG. 10 is a cross-sectional view showing a micro light emitting diode according to a third embodiment of the present invention.
- FIG. 11 is a cross-sectional view for explaining an element mounting method according to a fourth embodiment of the present invention.
- FIG. 12 is a cross-sectional view for explaining an element mounting method according to a fourth embodiment of the present invention.
- FIG. 13 is a cross-sectional view for explaining an element mounting method according to a fourth embodiment of the present invention.
- an element holding layer 12 made of a substance capable of controlling viscosity is formed on a substrate 11.
- the element holding layer 12 may be formed by any method. Specifically, for example, coating (spin coating, etc.), printing (contact printing method, imprinting method, screen printing, gravure printing, offset printing) Etc.).
- the element holding layer 12 is made of, for example, a photosensitive resin or a thermosetting resin, but is not limited thereto.
- the element holding layer 12 immediately after formation is in an uncured state, and has a viscosity that is low enough to allow this element to move when the element holding layer 12 is mounted and mounted. Has fluidity.
- the viscosity of the first portion 12a including the element mounting region of the element holding layer 12 is controlled to a viscosity that allows the element to be mounted to move naturally,
- the viscosity is controlled so that the device cannot move naturally.
- the curing is performed by selectively irradiating the second portion 12b with light such as ultraviolet rays or an electron beam under the exposure conditions according to the photosensitive resin to be used.
- the second portion 12b is selectively irradiated with light such as ultraviolet rays or an electron beam under the exposure conditions according to the thermosetting resin to be used. It can be performed by heating to a temperature higher than the curing temperature.
- Figure 5 (B) shows a plan view of this state. As shown in FIG. 5 (B), in this case, the planar shape of the first portion 12a is a circle. Although only one first portion 12a is shown in FIG. 5, when a plurality of elements are mounted, a plurality of first portions 12a are also formed.
- FIG. 6 (A) the cylindrical element 13 is mounted on the first portion 12 a of the element holding layer 12.
- Figure 6 (B) shows a plan view of this state. It is sufficient that the element 13 is mounted within the range of the first portion 12a. Even if the mounting accuracy at this time is low, there is no problem.
- the center of gravity C of the element 13 is shifted by ⁇ from the center of gravity C of the first portion 12a.
- the resultant force F of the component parallel to the substrate surface acts on the element 13, and this element 13 gradually moves toward the center of gravity C of the first portion 12a.
- the resultant force F is such that the center of gravity C of the element 13 is the first part 1
- the time required for the center of gravity C of the first part 12a to coincide with the center of gravity C of the first part 12a is the first part 1
- the element 13 may be made easier to move.
- the portion 12a is cured.
- the element holding layer 12 is made of a photosensitive resin.
- the first portion 12a is irradiated with light. And it can carry out by heating to the temperature more than hardening temperature. As a result, the element 13 is firmly fixed to the center of gravity C of the cured first portion 12a, and the mounting is completed.
- the element 13 is placed at the center of gravity C of the first portion 12a.
- the initial mounting position accuracy of the element 13 may be as low as ⁇ 7 zm.
- the formation position accuracy when mounting a large number on the same substrate and the mounting position accuracy of the mounting device are low, and the manufacturing cost of the element 13 and the mounting device can be reduced by reducing the process cost.
- the elements 13 aggregate together.
- the element holding layer 12 in the uncured first state is likely to be worse than the mounting position accuracy of the mounting apparatus.
- a glass substrate was used as the substrate 11, and a cylindrical micro light-emitting diode having a diameter of 20 / m and a height of 12 / m was mounted as the element 13 on the glass substrate as follows.
- alignment marks are formed in advance at a predetermined position on the glass substrate using a thin film metal or the like.
- a photosensitive resin layer having a thickness of 3.5 zm was applied and formed on the glass substrate by spin coating as the element holding layer 12.
- an exposure device such as a contact aligner or a stepper (reduced projection exposure device) with reference to the alignment mark described above.
- the positional accuracy with respect to the alignment mark is ⁇ lxm.
- the second outer part of the circular first part 12a with a diameter of 30 xm Part 12b was cured (temporary curing).
- a micro light-emitting diode was formed as follows. First, an n-type GaN layer, an active layer, and a p-type GaN layer, which form a light emitting diode structure on a sapphire substrate, are sequentially grown by a conventionally known technique, and then these layers are patterned into a truncated cone shape. In addition, a micro light-emitting diode array is formed by forming a P-side electrode and an end face protective layer. Next, it includes steps such as fixing the p-side electrode side to another substrate via a temporary adhesive layer and selectively irradiating a laser beam such as an excimer laser from the back side of the sapphire substrate.
- Each micro light-emitting diode has a cylindrical shape with a diameter of 20 ⁇ m and a height of 12 ⁇ m.
- the relative position accuracy of the micro light-emitting diode during mounting is ⁇ 2 ⁇ .
- the mounting position accuracy for the alignment mark at this time is ⁇ 7 ⁇ .
- the viscosity of the first portion 12a was sufficiently low to be about 1 to lOOOOPa's.
- An optical micrograph of this state is shown in Fig. 8 (A). In Fig.
- the uncured area is described as ⁇ 30 ⁇ m
- the round part is the first part 12a
- the round part described as LED ⁇ 20 ⁇ ⁇ is the micro light-emitting diode. It is.
- the center of gravity of the micro light-emitting diode deviates considerably from the center of gravity of the first portion 12a.
- the glass substrate on which the micro light emitting diode was mounted on the first portion 12a was heated to 80 ° C.
- the viscosity of the first portion 12a was significantly reduced to 0.001 to: lOPa's while the cured state of the second portion 12b was preserved, and the fluidity was greatly increased.
- the micro light-emitting diode mounted on the first portion 12a moves toward the center of gravity of the first portion 12a, and after 3 minutes from the start of heating to 80 ° C, the micro light-emitting diode The center of gravity almost coincided with the center of gravity of the first portion 12a.
- a positional accuracy of ⁇ 7 xm Was self-aligned to ⁇ 1.5 ⁇ .
- An optical micrograph of this state is shown in Fig. 8 (B).
- the entire surface of the photosensitive resin layer was exposed with ultraviolet rays, and both the first portion 12a and the second portion 12b were sufficiently cured.
- the micro light emitting diode was firmly fixed to the first portion 12a.
- the mounting method according to the first embodiment is used to mount the red light emitting micro light emitting diode, the green light emitting micro light emitting diode, and the green light emitting micro light emitting diode on the substrate 11.
- a method for manufacturing a micro light emitting diode display will be described.
- alignment marks are formed in advance at a predetermined position on a transparent substrate 11 such as a glass substrate using a thin film metal or the like.
- a photosensitive resin layer is formed on the substrate 11 as a device holding layer 12 made of a substance whose viscosity can be controlled by spin coating or the like.
- the thickness of this photosensitive resin layer is, for example, 3.5 im.
- ultraviolet rays are applied to areas other than the 35 ⁇ m diameter area (first part 12a) at a pitch of 150 ⁇ m with the above alignment mark as a reference. Irradiate to expose the photosensitive resin layer.
- the position accuracy for the alignment mark at this time is ⁇ 1 ⁇ m.
- a cylindrical micro light-emitting diode with a diameter of 20 / im and a height of 12 ⁇ m is formed at a pitch of 150 / im X 150 ⁇ m on a relay substrate on which a slightly adhesive silicone rubber is formed by laser selective transfer or the like.
- the relative position accuracy of the micro light emitting diode is ⁇ 2 ⁇ m.
- 160 X 120 19200 micro light-emitting diodes of each color are mounted on one relay board. Prepare 16 relays of each color, assuming that such a relay board is mounted with RGB micro light-emitting diodes.
- the micro light-emitting diode from the relay substrate is mounted on the photosensitive resin layer on the glass substrate with a 35 xm diameter first part 12a mounted.
- the mounting position accuracy for the alignment mark at this time is ⁇ 7 ⁇ m It is.
- the viscosity of the first portion 12a had a fluidity as low as about 1 to about lOOOOPa's.
- reference numeral 30 denotes a red light emitting micro light emitting diode
- reference numeral 40 denotes a green light emitting micro light emitting diode
- reference numeral 50 denotes a blue light emitting micro light emitting diode.
- the glass substrate on which the micro light emitting diode is mounted on the first portion 12a as described above is heated to 80 ° C.
- the viscosity of the first part 12a is greatly reduced to 0.001 ⁇ : lOPa's while the cured state of the second part 12b is preserved, and the fluidity is greatly increased.
- the micro light emitting diode mounted on the first portion 12a moves toward the center of gravity of the first portion 12a, and after 3 minutes from heating to 80 ° C, the center of gravity of the micro light emitting diode is It almost coincides with the center of gravity of the first portion 12a.
- the position accuracy of ⁇ 7 / im was self-aligned to ⁇ 1.5 / im.
- the step transfer boundary disappears. This state is shown in Fig. 9 (B).
- the entire surface of the photosensitive resin layer is exposed with ultraviolet rays, and both the first portion 12a and the second portion 12b are sufficiently cured. In this way, the micro light-emitting diode is firmly fixed to the first portion 12a.
- each micro light emitting diode is wired and connected to the driving IC.
- a passive micro light emitting diode display having a pixel pitch of 150 / im, a micro light emitting diode positional accuracy of ⁇ 1.5 m, and a pixel number of 640 X RGB X 480 diagonal of 4.7 inches can be manufactured.
- the red light emitting micro light emitting diode 30, the green light emitting micro light emitting diode 40, and the blue light emitting micro light emitting diode 50 are provided on the substrate 11. Since it can be arranged easily and with high positional accuracy, the uniformity of the display screen can be improved. Step transfer also eliminates step transfer boundaries when manufacturing micro light emitting diode displays larger than the size of growth substrates such as sapphire substrates that form micro light emitting diodes 30, 40, 50. This also makes the display screen uniform It is possible to improve the performance.
- the manufacturing cost of the micro light emitting diodes 30, 40, 50 can be reduced and the cost of the mounting device can be reduced, and the manufacturing cost of the micro light emitting diode display can be reduced.
- Figure 10 shows this micro light emitting diode.
- a light emitting diode structure is formed by an n-type semiconductor layer 61, an active layer 62 thereon, and a p-type semiconductor layer 63 thereon.
- the n-type semiconductor layer 61, the active layer 62, and the p-type semiconductor layer 63 as a whole have, for example, a circular planar shape, and the end face (side face) 64 is at an angle ⁇ with respect to the lower face of the n-type semiconductor layer 61. Inclined.
- a circular p-side electrode 65 is formed on the p-type semiconductor layer 63.
- a circular n-side electrode 66 is formed on a part of the lower surface of the n-type semiconductor layer 61.
- a transparent insulating layer 67 is formed around the n-side electrode 66 on the lower surface of the n-type semiconductor layer 61.
- An insulating layer 68 is formed so as to cover the end face 64 from the n-side electrode 66 and the transparent insulating layer 67 to a height in the middle of the end face 64.
- an insulating layer 69 is formed up to a position higher than the p-side electrode 65.
- a contact via 70 is formed in the insulating layer 69 above the p-side electrode 65. This contact via 70 is for causing the p-side electrode 65 to contact the wiring.
- the semiconductors used for the n-type semiconductor layer 61, the active layer 62, and the p-type semiconductor layer 63 are selected as necessary. Specifically, for example, a GaN-based semiconductor, an AlGalnP-based semiconductor, or the like is used.
- the n-type semiconductor layer 61 is an n-type GaN layer with a thickness of, for example, 2600 nm
- the active layer 62 has a thickness of, for example, 200 nm
- the p-type semiconductor layer 63 is a p-type GaN layer with a thickness of, for example, 200 nm.
- the active layer 62 has, for example, a multiple quantum well (MQW) structure composed of an InGaN well layer and a GaN barrier layer.
- MQW multiple quantum well
- the In composition of the InGaN well layer is, for example, 0 when the GaN-based light emitting diode emits blue light. 17. In case of green light emission, for example, 0.25. If the maximum diameter of the light emitting diode structure, that is, the diameter of the lower surface of the n-type GaN layer 61 is a, a is 20 ⁇ m, for example.
- the thickness force of the n-type GaN layer 61 as the n-type semiconductor layer 61 is 2600 nm
- the thickness of the active layer 62 and the p-type GaN layer as the p-type semiconductor layer 63 is 200 nm
- ⁇ is, for example, 50 degrees.
- the p-side electrode 65 is made of, for example, a metal multilayer film having an Ag / Pt / Au structure.
- the Ag film has a thickness of 50 nm
- the Pt film has a thickness of 50 nm
- the Au film has a thickness of 2000 nm, for example.
- the p-side electrode 65 may be made of an Ag single layer film.
- the n-side electrode 66 is made of, for example, a Ti / Pt / Au structure metal multilayer film.
- the thickness of the Ti film and the Pt film is, for example, 50 nm
- the thickness of the Au film is, for example, 2000 nm.
- the micro light-emitting diodes can be arranged with high positional accuracy, so that various countermeasure steps applied to the micro light-emitting diodes against misalignment can be omitted.
- the positional accuracy of ⁇ 5 xm was realized by increasing the accuracy of the mounting device without using the mounting method according to the second embodiment, but the second embodiment Because it is possible to achieve a positional accuracy of ⁇ 1 ⁇ 5 ⁇ , the configuration and manufacturing method of the micro light-emitting diode can be greatly simplified.
- a transparent electrode made of ITO ink or the like is used for the wiring of the n-side electrode 66 on the light-emitting surface side in order to suppress variations in light extraction efficiency due to the positional deviation of the micro light-emitting diode.
- the positional accuracy can be set to ⁇ 1
- the extraction efficiency can be improved.
- Variation can be kept within an allowable range. That is, since it is not necessary to use a transparent electrode made of ITO ink or the like for the wiring of the n-side electrode 66, it is possible to easily form the wiring of the n-side electrode 66.
- the end face 64 of the n-type semiconductor layer 61, the active layer 62, and the p-type semiconductor layer 63 the end face 64 is covered with a resin layer. Therefore, if wiring is applied to the p-side electrode 65 and the n-side electrode 66 with the interface between the resin layer and the end face 64 exposed, a short circuit and other defects may occur. Therefore, conventionally, for example, a resin layer is formed thick enough to cover the entire end face 64 and also to cover the p-side electrode 65. It was necessary to prevent the interface between the resin layer and the end face 64 from being exposed by forming a similar material.
- the contact via displacement is ⁇ 2 ⁇
- the diameter is severely limited to 6 ⁇ or less.
- the contact via displacement is ⁇ 3 m, and the contact via diameter is 11 ⁇ m. The following design becomes possible, and the design becomes extremely easy.
- the first portion of the element holding layer 12 made of a substance capable of controlling the viscosity is used. 1 After mounting the element 13 on 2a and self-aligning it, the first portion 12a is cured.
- the second element holding layer 12 is formed so as to cover the entire element 13 and element holding layer 12.
- the element for mounting the viscosity of the first portion 12a of the second element holding layer 12 naturally moves.
- the viscosity is controlled to a possible viscosity, and the second portion 12b of the element holding layer 12 is selectively cured to control the viscosity so that the element cannot move naturally.
- the position of the first portion 12a of the second element holding layer 12 is the same as the position of the first portion 12a of the first element holding layer 12. Also good.
- the element 14 is embedded in the first portion 12a of the second element holding layer 12 and mounted.
- Element 14 can be the same or different from element 13. After a certain period of time, the element 14 is self-aligned with the first portion 12a as shown in FIG. Thereafter, the first portion 12a is cured.
- the elements 13 and 14 can be arranged in two stages.
- the elements can be arranged in multiple stages.
- the fourth embodiment it is possible to easily obtain a mounting structure in which a plurality of elements are three-dimensionally mounted with high positional accuracy.
- the numerical values, materials, configurations, structures, shapes, substrates, raw materials, processes, etc. mentioned in the first to third embodiments are merely examples, and different numerical values and materials are necessary as necessary.
- a structure, a structure, a shape, a substrate, a raw material, a process, or the like may be used.
- the present invention when an object such as an element, particularly a minute object, is mounted on a substrate, it can be easily mounted with a certain force and high positional accuracy. By using this mounting method, various high-performance electronic devices and high-performance light-emitting diode displays can be easily realized.
Landscapes
- Led Device Packages (AREA)
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Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/373,479 US8101457B2 (en) | 2006-07-12 | 2007-06-25 | Mounting method, mounted structure, manufacturing method for electronic equipment, electronic equipment, manufacturing method for light-emitting diode display, and light-emitting diode display |
| EP07767530.4A EP2048704A4 (en) | 2006-07-12 | 2007-06-25 | ATTACHING METHOD, ATTACHMENT STRUCTURE, METHOD FOR PRODUCING ELECTRONIC EQUIPMENT, ELECTRONIC DEVICES, METHOD FOR PRODUCING AN ILLUMINATED DIODE DISPLAY AND LUMINOUS DIODE DISPLAY |
| CN2007800263132A CN101490828B (zh) | 2006-07-12 | 2007-06-25 | 安装方法及结构体、电子设备及其制造方法、发光二极管显示器及其制造方法 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-191365 | 2006-07-12 | ||
| JP2006191365A JP4899675B2 (ja) | 2006-07-12 | 2006-07-12 | 実装方法、電子機器の製造方法および発光ダイオードディスプレイの製造方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008007535A1 true WO2008007535A1 (fr) | 2008-01-17 |
Family
ID=38923100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/062724 Ceased WO2008007535A1 (fr) | 2006-07-12 | 2007-06-25 | Procédé de montage, structure de montage, procédé de fabrication d'équipement électronique, équipement électronique, procédé de fabrication d'affichage à diode électroluminescente et affichage à diode électroluminescente |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US8101457B2 (ja) |
| EP (1) | EP2048704A4 (ja) |
| JP (1) | JP4899675B2 (ja) |
| KR (1) | KR20090031411A (ja) |
| CN (1) | CN101490828B (ja) |
| WO (1) | WO2008007535A1 (ja) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101490828B (zh) | 2011-07-06 |
| EP2048704A4 (en) | 2013-08-07 |
| US20090290337A1 (en) | 2009-11-26 |
| CN101490828A (zh) | 2009-07-22 |
| KR20090031411A (ko) | 2009-03-25 |
| JP2008021769A (ja) | 2008-01-31 |
| EP2048704A1 (en) | 2009-04-15 |
| JP4899675B2 (ja) | 2012-03-21 |
| US8101457B2 (en) | 2012-01-24 |
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