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Patent US8101457 - Mounting method, mounted structure, manufacturing method for electronic ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsProvided is a mounting method making it possible to, when an object such as an element, or more particularly, a microscopic object is mounted on a substrate, achieve mounting readily and reliably with high positional precision by: forming an element holding layer 12, which is made of a material whose...http://www.google.com/patents/US8101457?utm_source=gb-gplus-sharePatent US8101457 - Mounting method, mounted structure, manufacturing method for electronic equipment, electronic equipment, manufacturing method for light-emitting diode display, and light-emitting diode displayAdvanced Patent SearchPublication numberUS8101457 B2Publication typeGrantApplication numberUS 12/373,479Publication dateJan 24, 2012Filing dateJun 25, 2007Priority dateJul 12, 2006Also published asCN101490828A, CN101490828B, EP2048704A1, EP2048704A4, US20090290337, WO2008007535A1Publication number12373479, 373479, US 8101457 B2, US 8101457B2, US-B2-8101457, US8101457 B2, US8101457B2InventorsKatsuhiro Tomoda, Masato Doi, Toshiya Takagishi, Toshiaki KanemitsuOriginal AssigneeSony CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (16), Non-Patent Citations (1), Classifications (35), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetMounting method, mounted structure, manufacturing method for electronic equipment, electronic equipment, manufacturing method for light-emitting diode display, and light-emitting diode displayUS 8101457 B2Abstract Provided is a mounting method making it possible to, when an object such as an element, or more particularly, a microscopic object is mounted on a substrate, achieve mounting readily and reliably with high positional precision by: forming an element holding layer 12, which is made of a material whose viscosity can be controlled, on a substrate 11; controlling the viscosity of a first part 12 a of the element holding layer 12, which includes a mounting region for an element, into a viscosity making the element naturally movable, and controlling the viscosity of a second part 12 b of the element holding layer 12 outside the first part 12 a into a viscosity making the element naturally immovable; and after mounting one element 13 in the first part 12 a, controlling the viscosity of the first part 12 a into the viscosity making the element 13 naturally immovable.
7. The mounting method according to claim 4, wherein assuming that the area of the first part is S1, the area of the bottom of the object is S2, the height of the object is t2, and the difference between the height of the bottom of the object and the height of the surface of the object holding layer after the object is mounted in the first part is d, S1�d<(S1−S2)�t2 is established.
13. The mounting method according to claim 1, wherein the viscosity making the object naturally movable is between 1 Pa�s and 1000 Pa�s.
14. The mounting method according to claim 13, wherein the viscosity of the first part is lowered to between 0.001 Pa�s and 10 Pa�s after mounting the object in the first part and before controlling the viscosity of the first part into the viscosity making the object immovable.
after mounting the light-emitting diode in the first part, controlling the viscosity of the first part into a viscosity making the light-emitting diode naturally immovable. Description
CROSS REFERENCE TO RELATED APPLICATIONS The present application claims priority to Japanese Patent Document No. P2006-191365 filed on Aug. 31, 2007, the disclosures of which are herein incorporated by reference.
The positional precision of each pixel in a display is generally requested to be about 1/100 of a pixel pitch from the viewpoint of homogeneity of a screen. Therefore, in a display to be manufactured by mounting spontaneous light-emitting elements such as light-emitting diodes on a substrate, the precision in a mounted position of about 1/100 of a pixel pitch is requested. For example, in a full-high definition (HD) full-color display having a diagonal of 40 inches, since the number of pixels in a horizontal direction of a screen is 1920 and the number of pixels in a vertical direction of the screen is 1080, the pixel pitch comes to 0.461 mm and the requested precision in a mounted position comes to �0.005 mm (5 μm). In this case, the number of light-emitting elements to be mounted comes to 1920�1080�(the numbers of light-emitting elements of three colors of red (R), green (G), and blue (B) used to constitute one pixel), that is, approximately 2 million�(the numbers of light-emitting elements of three colors of R, G, and B used to constitute one pixel). In order to mount such an enormous number of light-emitting elements on a 40-inch substrate with the positional precision of �0.005 mm, development of a very high-precision mounting apparatus is required. Moreover, when a large-screen display is produced by forming a light-emitting element array in a size smaller than the screen size, and sequentially mounting the light-emitting element array on the substrate while shifting the position, that is, performing stepped mounting, higher precision in a mounted position is requested for a difference in a pitch of a light-emitting element array formed first. For example, when the difference in a pitch is �0.002 mm, the precision in a mounted position is requested to be �0.003 mm. Considerable difficulty arises from the viewpoint of the cost of the mounting apparatus and a throughput.
SUMMARY The difficulty in mounting arises not only when a light-emitting element is mounted but also when a microscopic object is generally mounted with the positional precision that is on the order of micrometers.
The number of objects to be mounted in the first part is typically one. In some cases, a plurality of objects may be mounted. The objects may be of the same type or may be of different types. Thinking of a case where one object is embedded and mounted in the first part, since the first part has fluidity, the first part around the object swells. At this time, inside a substrate surface, if the center of gravity of the object is deviated from the center of gravity of the first part, a resultant force of components of a surface tension of the first part, which comes into contact with the flank of the object, in parallel with the substrate surface works on the object. The resultant force is oriented to the center of gravity of the first part. The resultant force acts as a driving force, and the object automatically (naturally) moves toward the center of gravity of the first part. Accordingly, the resultant force diminishes. Inside the substrate surface, when the center of gravity of the object squares with the center of gravity of the first part, the resultant force becomes null, and the movement of the object ceases. When the object is merely embedded and mounted in the first part, the center of gravity of the object can be automatically positioned at the center of the gravity of the first part. Namely, the object can be autonomously aligned with the first part (self-alignment). In order to achieve the autonomous alignment for a shorter time, it proves effective that after the object is mounted in the first part, before the viscosity of the first part is controlled into the viscosity making the object immovable, the viscosity of the first part is lowered. In order to more effectively achieve the autonomous alignment, when the object is mounted in the first part, the contact angle of the first part with respect to the flank (end surface) of the object should preferably be equal to or smaller than 90�. In particular, when the viscosity of the first part is lowered in order to achieve the autonomous alignment for a shorter period of time, the contact angle of the first part with respect to the flank (end surface) of the object in this state should preferably be equal to or smaller than 90�. In order to facilitate the autonomous alignment, an ultrasonic vibration or the like may be applied to the substrate. If multiple objects are embedded and mounted in the first part, the aforesaid resultant force works on each of the objects according to the position. The objects are automatically (naturally) arrayed around the center of gravity of the first part. In this case, the objects may come into contact with one another and enter an aggregated state.
The viscosity of the first part making the object movable ranges, for example, 1 to 10000 Pa�s. However, the present invention is not limited to the viscosity. If the viscosity of the first part is lowered in order to achieve autonomous alignment for a shorter period of time, the lowered viscosity ranges, for example, 0.001 to 10 Pa�s. However, the present invention is not limited to the viscosity. For reference, the viscosity of water at room temperature is 0.001 Pa�s.
FIG. 1 shows a state in which: an object holding layer made of a material whose viscosity can be controlled is formed on a substrate; the viscosity of a first part of the object holding layer, which includes a mounting region for an object, is controlled into a viscosity making the object movable, and the viscosity of a second part of the object holding layer outside the first part is controlled into a viscosity making the object immovable; and at least one object is embedded and mounted in the first part. The thickness of the object holding layer to be formed first is t1, the area of the first part is S1, the area of the bottom of the object is S2, the height of the object is t2, and the difference between the height of the bottom of the object, which is mounted in the first part, and the height of the surface of the object holding layer is d. At this time, preferably, 1<S1/S2<100, more preferably, 1<S1/S2<10, or more preferably, 1<S1/S2<5 should be established from the viewpoint that a force large enough to move the object toward the center of gravity of the first part due to a surface tension of the first part should work. As shown in FIG. 2, the volume of part of the object embedded in the first part is S2�d, and the volume of part of the first part that has swelled around the object because the object has expelled the first part is also S2�d. In FIG. 3, the volume of a region indicated with a dot line is expressed as (S1−S2)�(t2−d). Preferably, (S1−S2)�(t2−d)>S2�d should be established from the viewpoint that a force large enough to move the object toward the center of gravity of the first part due to the surface tension of the first part should work. When the region is deformed, S1�d<(S1�S2)�t2 is established.
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a sectional view for explaining a mounting method in accordance with the present invention.
DETAILED DESCRIPTION Referring to the drawings, embodiments of the present invention will be described below. In all the drawings of the embodiments, the same reference numerals are assigned to identical or equivalent parts.
As mentioned above, according to the first embodiment, the element 13 can be autonomously aligned with the center of gravity C0 of the first part 12 a automatically and readily with high positional precision. For example, even if the positional precision the completed element 13 is requested to exhibit is �1.5 μm, the initial precision in the mounted position of the element 13 may be as low as �7 μm. Therefore, when numerous elements 13 are formed on the same substrate, the precision in formed positions or the precision in mounted positions offered by a mounting apparatus may be low. A reduction in the cost of manufacture of the element 13 and a reduction in the cost of the mounting apparatus can be achieved due to a reduction in a process cost. Moreover, when multiple elements 13 are mounted on the substrate 11, if the elements 13 are embedded and mounted in the element holding layer 12 which is in an uncured state, or for example, in an uncured resin, since the elements 13 have the nature of mutually aggregating, there is a fear that the positional precision of the elements 13 may be worse than the precision in the mounted positions by the mounting apparatus. In the first embodiment, since one element 13 is embedded and mounted in the first part 12 a, which is in the uncured state, of the element holding layer 12, the aggregation of elements 13 can be essentially prevented.
Example A glass substrate was adopted as the substrate 11, and micro light-emitting diodes of 20 μm in diameter and 12 μm in height having a cylindrical shape were mounted as the elements 13 on the glass substrate as mentioned below.
Thereafter, an exposure apparatus, for example, a contact aligner or a stepper (reduced projection exposure apparatus) is used to irradiate ultraviolet rays to a region of the photosensitive resin layer on the glass substrate other than a region of 30 μm in diameter (first part 12 a) at a pitch of 150 μm�150 μm with each of the alignment marks as a reference. The photosensitive resin layer is thus exposed. At this time, the positional precision relative to the alignment mark is �1 μm. Thus, the second part 12 b outside the circular first part 12 a of 30 μm in diameter was cured (tentatively cured).
On the other hand, micro light-emitting diodes were formed as mentioned below. First, after an n-type GaN layer, an active layer, and a p-type GaN layer which constitute a light-emitting diode structure are sequentially grown on a sapphire substrate by using a known technique, the layers are patterned in the shape of a truncated cone, and p-side electrodes, an end surface protection layer and the like are formed in order to form a micro light-emitting diode array. Thereafter, according to a known laser selective transfer method including a step of fixing the p-side electrode side of the sapphire substrate to another substrate with a tentative adhesive layer between them and a step of selectively irradiating a laser beam, which is emitted from, for example, an excimer laser, from the back side of the sapphire substrate, the micro light-emitting diode array was mounted at the pitch of 150 μm�150 μm on a relay substrate having a slightly sticky silicon rubber formed thereon (refer to, for example, JP-A-2002-311858, JP-A-2002-314052, JP-A-2004-273596, and JP-A-2004-281630). The micro light-emitting diodes have a cylindrical shape of 20 μm in diameter and 12 μm in height. The precision in the relative position of the mounted micro light-emitting diodes is �2 μm.
Thereafter, with each of the alignment marks formed on the glass substrate as a reference, each of the micro light-emitting diodes was embedded and mounted from the relay substrate in the circular first part 12 a of 30 μm in diameter of the photosensitive resin layer on the glass substrate. At this time, the precision in the mounted position relative to the alignment mark is �7 μm. In this state, the viscosity of the first part 12 a is so low as to range from about 1 Pa�s to about 10000 Pa�s, and the first part 12 a has sufficient fluidity. FIG. 8(A) shows an optical microscopic photograph of the state. In FIG. 8(A), a circular part noted as �uncured area of φ 30 μm� represents the first part 12 a, and a circle noted as �LED φ 20 μm� represents a micro light-emitting diode. As seen from FIG. 8(A), the center of gravity of the micro light-emitting diode is considerably deviated from the center of gravity of the first part 12 a. Thereafter, the glass substrate having the micro light-emitting diodes mounted in the first parts 12 a was heated to 80� C. Owing to the heating, while the state in which the second parts 12 b were cured was preserved, the viscosity of the first parts 12 a greatly decreased to range from 0.001 Pa�s to 10 Pa�s and the fluidity thereof greatly increased. At that time, the micro light-emitting diode mounted in each of the first parts 12 a moved toward the center of gravity of the first part 12 a. After three minutes elapsed since the heating to 80� C. was initiated, the center of gravity of the micro light-emitting diode almost squared with the center of gravity of the first part 12 a. Thus, autonomous alignment was achieved to improve the positional precision of �7 μm into �1.5 μm. FIG. 8(B) shows an optical microscopic photograph of the state.
Thereafter, the photosensitive resin layer was entirely exposed using ultraviolet rays, and both the first parts 12 a and second parts 12 b were fully cured. Thus, the micro light-emitting diodes were firmly locked in the first parts 12 a. Next, the second embodiment of the present invention will be described below.
Thereafter, an exposure apparatus, for example, a contact aligner or a stepper is used to irradiate ultraviolet rays to a region other than a region (first part 12 a) of 35 μm in diameter at a pitch of 150 μm�150 μm with each of the alignment marks as a reference so as to expose the photosensitive resin layer. At this time, the positional precision relative to the alignment mark is �1 μm.
Thereafter, laser selective transfer or the like is performed in order to mount a micro light-emitting diode of 20 μm in diameter and 12 μm in height, which has a cylindrical shape, on a relay substrate, which has a slightly sticky silicon rubber formed thereon, at the pitch of 150 μm�150 μm. At this time, the precision in the relative position of the micro light-emitting diode is �2 μm. Thus, micro light-emitting diodes of each of colors numbering 160�120=19200 are mounted on one relay substrate. Sixteen relay substrates on which micro light-emitting diodes of each of red, green, and blue are mounted are made ready for each of the colors.
Thereafter, with each of the alignment marks on the substrate 11 as a reference, the micro light-emitting diodes were embedded and mounted (transferred) from the relay substrates in the circular first parts 12 a of 35 μm in diameter of the photosensitive resin layer on the glass substrate. At that time, the precision in the mounted position relative to the alignment mark is �7 μm. In that state, the viscosity of the first parts 12 a was so low as to range from about 1 Pa�s to about 10000 Pa�s and the first part 12 a had sufficient fluidity. The transfer is repeatedly performed (stepped transfer) using the 4�4 relay substrates by shifting a position on the photosensitive resin layer, and further repeatedly performed for the micro light-emitting diodes of three colors of red, green, and blue. FIG. 9(A) shows part of the substrate 11 in this state. In FIG. 9(A), reference numeral 30 denotes a red illuminant micro light-emitting diode, reference numeral 40 denotes a green illuminant micro light-emitting diode, and reference numeral 50 denotes a blue illuminant micro light-emitting diode.
Thereafter, the glass substrate having the micro light-emitting diodes mounted in the first parts 12 as mentioned above is heated to 80� C. Owing to the heating, while the state in which the second parts 12 b are cured is preserved, the viscosity of the first parts 12 a greatly decreases to range from 0.001 to 10 Pa�s and the fluidity thereof greatly increases. At this time, each of the micro light-emitting diodes mounted in the first parts 12 a moves toward the center of gravity of the first part 12 a. After three minutes elapses since the heating to 80� C., the center of gravity of the micro light-emitting diode almost squares with the center of gravity of the first part 12 a. Thus, autonomous alignment is achieved to improve the positional precision of �7 μm into �1.5 μm. Moreover, at this time, a stepped transfer boundary vanishes. FIG. 9(B) shows this state.
Thereafter, the photosensitive resin layer is entirely exposed using ultraviolet rays in order to fully cure the first parts 12 a and second parts 12 b. Thus, the micro light-emitting diodes are firmly locked in the first parts 12 a. Thereafter, each of the micro light-emitting diodes is wired and thus connected to a driving IC.
As mentioned above, a passive type micro light-emitting diode display having a pixel pitch of 150 μm, the positional precision of a micro light-emitting diode of �1.5 μm, the number of pixels of 640�RGB�480, and a diagonal of 4.7 inches can be manufactured.
According to the second embodiment, similarly to the first embodiment, the red illuminant micro light-emitting diodes 30, green illuminant micro light-emitting diodes 40, and blue illuminant micro light-emitting diodes 50 can be readily arrayed on the substrate 11 with high positional precision. Therefore, the homogeneity of a display screen can be improved. Moreover, when a micro light-emitting diode display of a size larger than the size of a grown substrate such as a sapphire substrate on which the micro light-emitting diodes 30, 40, and 50 are formed is manufactured through stepped transfer, the stepped transfer boundary can be vanished. This contributes to improvement in the homogeneity of a display screen. For example, even when the positional precision the micro light-emitting diodes 30, 40, and 50 are requested at the time of completion of the display is �1.5 μm, the initial precision in the mounted positions of the micro light-emitting diodes 30, 40, and 50 may be as low as �7 μm. Therefore, when the numerous micro light-emitting diodes 30, 40, and 50 are formed on the same substrate, the precision in the formed positions or the precision in the mounted positions offered by a mounting apparatus may be low. Consequently, a reduction in the cost of manufacture for the micro light-emitting diodes 30, 40, and 50 or in the cost of the mounting apparatus can be achieved owing to a reduction in a process cost. Eventually, a reduction in the cost of manufacture for the micro light-emitting diode display can be achieved.
As shown in FIG. 10, in the micro light-emitting diode, a light-emitting diode structure is formed with an n-type semiconductor layer 61, an active layer 62 on the n-type semiconductor layer, and a p-type semiconductor layer 63 on the active layer. The n-type semiconductor layer 61, active layer 62, and p-type semiconductor layer 63 have, for example, a circular planar shape as a whole. The end surface (flank) 64 slopes at an angle θ with respect to the bottom of the n-type semiconductor layer 61. The sectional shape in the direction of the diameters of the n-type semiconductor layer 61, active layer 62, and p-type semiconductor layer 63 is trapezoidal (θ<90�), rectangular (θ=90�), or inversely trapezoidal (θ>90�). For example, a circular p-side electrode 65 is formed on the p-type semiconductor layer 63. For example, a circular n-side electrode 66 is formed on part of the bottom of the n-type semiconductor layer 61. A transparent insulating layer 67 is formed around the n-side electrode 66 on the bottom of the n-type semiconductor layer 61. An insulating layer 68 is formed from the n-side electrode 66 and transparent insulating layer 67 up to the middle of the height of the end surface 64 so that it will cover the end surface 64. An insulating layer 69 is formed on the insulating layer 68 up to a position higher than the p-side electrode 65. A contact via 70 is formed in part of the insulating layer 69 on the p-side electrode 65. The contact via 70 is used to bring wiring into contact with the p-side electrode 65.
When the micro light-emitting diode is, for example, a GaN-series light-emitting diode, concrete examples of the dimensions and material will be described below. The n-type semiconductor layer 61 is an n-type GaN layer, and the thickness thereof is, for example, 2600 nm. The thickness of the active layer 62 is, for example, 200 nm. The p-type semiconductor layer 63 is a p-type GaN layer, and the thickness thereof is, for example, 200 nm. The active layer 62 has, for example, a multi-quantum well (MQW) structure composed of an InGaN well layer and a GaN barrier layer. When the GaN-series light-emitting diode is blue-illuminant, the In composition of the InGaN well layer is, for example, 0.17. When the GaN-series light-emitting diode is green-illuminant, the In composition is, for example, 0.25. Assuming that the maximum diameter of the light-emitting diode structure, that is, the diameter of the bottom of the n-type GaN layer 61 is a, a denotes, for example, 20 μm. When the thickness of the n-type GaN layer 61 serving as the n-type semiconductor layer 61 is 2600 nm and the thickness of the p-type GaN layers serving as the active layer 62 and p-type semiconductor layer 63 respectively is 200 nm, the overall thickness of the light-emitting diode structure comes to 2600+200+200=3000 nm=3 μm. In this case, assuming that the overall thickness (height) of the light-emitting diode structure is b, the aspect ratio of the light-emitting diode structure is expressed as b/a=3/20=0.15. θ is, for example, 50�. The p-side electrode 65 is formed with, for example, a metallic multilayer film having an Ag/Pt/Au structure. The thickness of the Ag film is, for example, 50 nm, the thickness of the Pt film is, for example, 50 nm, and the thickness of the Au film is, for example, 2000 nm. The p-side electrode 65 may be formed with a monolayer film made of Ag. The n-side electrode 66 is formed with a metallic laminated film having, for example, a Ti/Pt/Au structure. The thickness of each of the Ti film and Pt film is 50 nm, and the thickness of the Au film is, for example, 2000 nm.
Specifically, conventionally, the mounting method in accordance with the second embodiment is not employed but the precision offered by a mounting apparatus is improved in order to realize the positional precision of �5 μm. In the second embodiment, since the positional precision of �1.5 μm can be realized, the constitution of a micro light-emitting diode and the manufacturing method thereof can be greatly simplified. Specifically, when the positional precision is �5 μm, a transparent electrode made of an ITO ink or the like has to be used for the wiring of the n-side electrode 66 on a light-emitting surface side in order to suppress a variance in light extraction efficiency derived from a positional deviation of a micro light-emitting diode. In the third embodiment, since the positional precision can be set to �1.5 μm, even when a metallic wiring that can be readily formed is adopted as the wiring of the n-side electrode 66, the variance in the extraction efficiency can be confined to a permissible range. Specifically, since the transparent electrode made of the ITO ink or the like need not be used for the wiring of the n-side electrode 66, the wiring of the n-side electrode 66 can be readily formed.
Moreover, conventionally, the end surface 64 is covered with a resin layer in order to protect the end surface 64 of the n-type semiconductor layer 61, active layer 62, and p-type semiconductor layer 63. If the p-side electrode 65 and n-side electrode 66 are wired with the interface between the resin layer and end surface 64 exposed, a short circuit or any other fault may occur because of the poor adherence between the resin layer and end surface 64. Consequently, conventionally, for example, the resin layer has to be formed to be so thick as to cover the entire end surface 64 and p-side electrode 65 alike, and a contact via or an equivalent to be used to bring the wiring into contact with the end surface has to be formed in the resin layer, so that the interface between the resin layer and end surface 64 will not be exposed. At this time, when the positional precision of a micro light-emitting diode is �5 μm, such strict restrictions that a positional deviation of a contact via should be �2 μm and the diameter of the contact via should be equal to or smaller than 6 μm have to be imposed for fear the interface between the resin layer and end surface 64 may be exposed. In contrast, according to the third embodiment, for example, when the positional precision of a micro light-emitting diode is �1.5 μm, for example, a design signifying that the positional deviation of a contact via is �3 μm and the diameter of the contact via is equal to or smaller than 11 μm can be achieved. Designing can be very easy to do.
As mentioned above, when the positional precision of a micro light-emitting diode is �5 μm, it is hard to form a contact via with a positional deviation of �2 μm and a via diameter of 6 μm or less. As an alternative structure, a bump has to be formed on the p-side electrode 65. In contrast, according to the third embodiment, since the positional precision of a micro light-emitting diode can be set to, for example, �1.5 μm, the contact via can be readily formed. Eventually, the bump formation step can be excluded.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4781775Jun 1, 1987Nov 1, 1988Motorola Inc.Glass slurryUS20030162463 *Apr 9, 2002Aug 28, 2003Kunihiko HayashiElement transfer method, element arrangmenet method using the same, and image displayUS20040012337Apr 19, 2002Jan 22, 2004Toyoharu OohataDevice transfer method, and device array method and image display unit production method using the sameUS20040195576Mar 12, 2004Oct 7, 2004Toshihiko WatanabeLight-emitting device, light-emitting apparatus, image display apparatus, method of manufacturing light-emitting device, and method of manufacturing image display apparatusUS20050233504Jan 28, 2004Oct 20, 2005Masato DoiDevice transfer method and display apparatusJP200187953A Title not availableJP200514141A Title not availableJP2001087953A Title not availableJP2002311858A Title not availableJP2002314052A Title not availableJP2004273596A Title not availableJP2004281630A Title not availableJP2004304161A Title not availableJP2005014141A Title not availableJPH01503424A Title not availableWO1988009724A1Mar 28, 1988Dec 15, 1988Motorola IncCoplanar die to substrate bond method* Cited by examinerNon-Patent CitationsReference1Japanese Office Action dated Apr. 12, 2011 for corresponding Japanese Application No. 2006-191365.Classifications U.S. Classification438/106, 438/28, 438/26, 257/E33.056, 438/27, 257/E21.499, 438/15International ClassificationH01L33/62, H01L33/10, H01L33/32, H01L21/00Cooperative ClassificationG09F9/33, H01L2924/01079, H01L2924/14, H01L2924/01005, H01L2924/01055, H01L2924/10349, H01L33/52, H01L2924/01015, H01L2924/15156, H01L2924/01027, H01L24/32, H01L2224/83051, H01L2224/83143, H05K3/305, H01L2924/01033, H01L2224/26175, H01L2224/27013, H01L2924/01023, H01L2924/01006, H01L2924/01047, H01L2224/83385, H01L2924/01078European ClassificationG09F9/33, H01L24/32Legal EventsDateCodeEventDescriptionJan 27, 2009ASAssignmentOwner name: SONY CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TOMODA, KATSUHIRO;DOI, MASATO;TAKAGISHI, TOSHIYA;AND OTHERS;REEL/FRAME:022161/0550Effective date: 20081209RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google