US20090020318A1 - Circuit board, and semiconductor device - Google Patents
Circuit board, and semiconductor device Download PDFInfo
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- US20090020318A1 US20090020318A1 US12/283,043 US28304308A US2009020318A1 US 20090020318 A1 US20090020318 A1 US 20090020318A1 US 28304308 A US28304308 A US 28304308A US 2009020318 A1 US2009020318 A1 US 2009020318A1
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- semiconductor chip
- mounting
- region
- conductive wiring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/4985—Flexible insulating substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
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- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/05573—Single external layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49838—Geometry or layout
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01078—Platinum [Pt]
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- 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
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of a flexible or folded printed circuit
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0364—Conductor shape
- H05K2201/0367—Metallic bump or raised conductor not used as solder bump
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09781—Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10674—Flip chip
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a circuit board such as a tape carrier substrate used in a chip-on-film device (COF), and a semiconductor device formed by joining the circuit board and a semiconductor chip.
- COF chip-on-film device
- FIG. 5 is a cross-sectional view showing a part of one example of a COF described in JP 2004-327936 A.
- the COF includes a semiconductor chip 4 mounted on a tape carrier substrate of a flexible and insulating film substrate 1 and is protected by an encapsulation resin 5 .
- Such a COF mainly is used as a driver for operating a flat panel display.
- the tape carrier substrate includes as main components an insulating film substrate 1 , conductive wirings 2 formed on a surface of the film substrate 1 and upper surfaces of bumps 3 on the conductive wirings 2 .
- a metal coating 6 is plated on some parts of the conductive wirings 2 and on the bumps 3 , while a layer of solder resist 7 as an insulating resin is formed on the other parts of the conductive wirings 2 .
- polyimide is used as a material of the film substrate 1 and copper is used as a material of the conductive wirings 2 .
- the bumps 3 are formed in general by forming the conductive wirings 2 on the film substrate 1 and then plating a metal thereon.
- the conductive wirings 2 are connected to the electrode pads 8 on the semiconductor chip 4 via the bumps 3 .
- an encapsulation resin is applied on a region for mounting a semiconductor chip on the tape carrier substrate, and subsequently the electrode pads 8 on the semiconductor chip 4 and the bumps on the tape carrier substrate are placed opposing each other, to which ultrasonic waves, heat and pressure are applied.
- FIG. 6 is a plan view showing schematically an example where the electrode pads 8 on the semiconductor chip 4 and the bumps 3 on the tape carrier substrate are placed opposing each other. It should be noted that the film substrate 1 is not shown in the drawing when viewed from the film substrate 1 side, for viewability. As shown in FIG. 6 , typically the plural conductive wirings 2 on the region for mounting the semiconductor chip 4 are straight and parallel to each other.
- FIG. 7 shows a break in a conductive wiring 2 at one corner of the semiconductor chip 4 . As shown in FIG. 7 , such a break 9 in the conductive wiring 2 will occur most in a bump 3 along the periphery side on the semiconductor chip 4 .
- the outermost conductive wirings 2 are made thicker than the remaining conductive wirings 2 .
- the bumps 3 are formed by plating a metal after formation of the conductive wirings 2 , the bumps 3 on the outermost conductive wirings 2 will become taller than the bumps 3 of the other conductive wirings 2 . This causes a level difference among the bumps 3 and results in connection failure. Therefore, this measure is not suitable for mounting the semiconductor chip 4 .
- the circuit board of the present invention includes, as basic components, a flexible insulating substrate, a plurality of conductive wirings formed in line on the flexible insulating substrate, and bumps provided at the end portions of the respective conductive wirings positioned in a region for mounting a semiconductor chip, on which the semiconductor chip can be mounted by bonding electrode terminals formed on the semiconductor chip to the bumps.
- a circuit board of the present invention includes further an auxiliary conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip, being adjacent to and outside the outermost conductive wiring, and an auxiliary bump formed on the auxiliary conductive wirings in line with the bumps on the conductive wirings, wherein one end portion of the auxiliary conductive wiring is terminated at a position in the outside vicinity of the auxiliary bump in an outward direction of the region for mounting the semiconductor chip, and the auxiliary conductive wiring is bent at the other end portion positioned inside the auxiliary bump in an inward direction of the region for mounting the semiconductor chip, and connected to an end of an adjacent outermost conductive wiring.
- one end portion of the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated in the outside vicinity of the bump in an outward direction of the region for mounting the semiconductor chip, and the outermost conductive wiring is bent at a position inside the bump in the region for mounting the semiconductor chip so as to cross a side edge of the region for mounting the semiconductor chip adjacent to a side edge where the bumps are arranged and to extend outwards.
- each outermost conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip has at least one bent portion at a position between the bump and the periphery of the region for mounting the semiconductor chip.
- FIG. 1 is a plan view showing a part of a tape carrier substrate in a first embodiment of the present invention.
- FIG. 2 is a plan view showing a variation at a part of the tape carrier substrate.
- FIG. 3 is a plan view showing a part of a tape carrier substrate in a second embodiment of the present invention.
- FIG. 4 is a plan view showing a part of a tape carrier substrate in a third embodiment of the present invention.
- FIG. 5 is a cross-sectional view showing a part of a semiconductor device including a conventional tape carrier substrate.
- FIG. 6 is a plan view showing a part of a conventional tape carrier substrate.
- FIG. 7 is a plan view showing a part of a conventional semiconductor device.
- a circuit board includes an auxiliary conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip, being adjacent to and outside the outermost conductive wiring, and an auxiliary bump formed on the auxiliary conductive wiring in line with the bumps on the conductive wirings.
- One end portion of the auxiliary conductive wiring is terminated at a position in the outside vicinity of the auxiliary bump in an outward direction of the region for mounting the semiconductor chip, and the auxiliary conductive wiring is bent at the other end portion positioned inside the auxiliary bump in an inward direction of the region for mounting the semiconductor chip, and connected to an end of an adjacent outermost conductive wiring. Therefore, concentration of stress on the outermost conductive wiring can be relieved due to the arrangement of the auxiliary bump, and a break in the wiring can be suppressed.
- auxiliary conductive wiring means the wiring provided in a form different from the other normal conductive wirings.
- the auxiliary conductive wiring is terminated at a position outside the auxiliary bump, with a length beyond the auxiliary bump being more than 0 ⁇ m and less than 300 ⁇ m.
- a dummy conductive wiring is provided along an extension from the end of the auxiliary conductive wiring in an outward direction of the region for mounting the semiconductor chip, the dummy conductive wiring being discontinuous from the auxiliary conductive wiring.
- one end portion of the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated in the outside vicinity of the bump in an outward direction of the region for mounting the semiconductor chip, and the outermost conductive wiring is bent at a position inside the bump in the region for mounting the semiconductor chip so as to cross a side edge of the region for mounting the semiconductor chip adjacent to a side edge where the bumps are arranged and to extend outwards. Accordingly, it is avoided to form a wiring at a region of the outermost conductive wiring on which stress will be concentrated, and a wiring for the region is formed into a different pattern, thereby a break in wiring caused by the concentration of stress can be avoided.
- the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated at a position outside the bump, with a length beyond the bump being more than 0 ⁇ m and less than 300 ⁇ m.
- a dummy conductive wiring is provided along extension from the end of the auxiliary conductive wiring in an outward direction of the region for mounting the semiconductor chip, the dummy conductive wiring being discontinuous from the auxiliary conductive wiring.
- each outermost conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip has at least one bent portion at a position between the bump and the periphery of the region for mounting the semiconductor chip. Since such a bent portion is provided at a position on which stress in the outermost conductive wiring will be concentrated, concentration of stress can be relieved to suppress a break in the wiring.
- a semiconductor device of the present invention includes a circuit board of any embodiments above and a semiconductor chip mounted on the circuit board, where electrode pads of the semiconductor chip and the respective conductive wirings are connected to each other via the bumps.
- FIG. 1 is a plan view showing a region for mounting a semiconductor chip of the tape carrier substrate in the first embodiment.
- the structure viewed from the film substrate 1 (see FIG. 5 ) side is shown while the film substrate 1 is not shown in FIG. 1 , so as to indicate schematically the relationship between conductive wirings 2 with bumps 3 and electrode pads 8 on a semiconductor chip 4 .
- These components are indicated similarly in the following embodiments.
- the bumps 3 are formed respectively on the plural conductive wirings 2 so as to correspond to the electrode pads 8 on the semiconductor chip 4 .
- Auxiliary conductive wirings 11 are placed outside outermost conductive wirings 10 , namely, at positions corresponding to outermost corners of the semiconductor chip 4 , and auxiliary bumps 12 are formed thereon.
- One end portion of each of the auxiliary conductive wirings 11 is terminated at a position in the outer side vicinity of the auxiliary bump 12 in an outward direction of the region for mounting the semiconductor chip 4 .
- the auxiliary conductive wiring 11 is bent at the other end portion positioned inside the auxiliary bump 12 in an inward direction of the region for mounting the semiconductor chip 4 , and connected to the end of the adjacent outermost conductive wiring 10 .
- each of the auxiliary conductive wirings 11 can be connected to not only the adjacent conductive wiring 10 but a plurality of conductive wirings including any other conductive wirings 2 placed on the same side of the semiconductor chip 4 .
- the auxiliary conductive wirings 11 and the auxiliary bumps 12 are formed in the same manner as ordinary conductive wirings 2 and bumps 3 .
- the auxiliary conductive wiring 11 is designed so as to protrude from the designed position for the bump 3 by an amount greater than a displacement that may occur in the step of forming the auxiliary bump 12 .
- the protrusion of the bump 3 from the designed position can be set not to exceed 300 ⁇ m, which has been proved through experiments to be sufficiently effective.
- FIG. 2 shows a variation of the embodiment as shown in FIG. 1 .
- dummy conductive wirings 13 are provided as the extensions of the auxiliary conductive wirings 11 , outside the auxiliary bumps 12 in the region for mounting the semiconductor chip.
- the dummy conductive wirings 13 are not connected to the auxiliary bumps 12 on the auxiliary conductive wirings 11 but they are formed to have the same pattern as the adjacent outermost conductive wirings 10 .
- the thermal expansion of the circuit board will be even at the time of mounting the semiconductor chip 4 irrespective of the locations.
- the dummy conductive wirings 13 can be connected to the outermost conductive wirings 10 or any other conductive wirings 2 outside the region shown in the drawing.
- FIG. 3 is a plan view showing a region for mounting a semiconductor chip of a tape carrier substrate in the second embodiment.
- outermost conductive wirings 14 placed at positions corresponding to the outermost corners of the semiconductor chip 4 have structures different from those of the other ordinary conductive wirings 2 . Namely, one end portion of each of the outermost conductive wirings 14 is terminated at a position in the outer side vicinity of a bump 3 in an outward direction of the region for mounting the semiconductor chip 4 (upward in the drawing).
- the outermost conductive wiring 14 is bent at a position inside the bump 3 in an inward direction of the region for mounting the semiconductor chip 4 so as to cross a side edge of the region for mounting the semiconductor chip 4 (right or left in the drawing) adjacent to a side edge where the bump 3 is arranged, and it extends outwards to form a bent wiring portion 14 a.
- the conductivity of the outermost conductive wirings 14 can be retained. Moreover, since stresses applied to the conductive wirings 2 adjacent to the outermost conductive wirings 14 can be relieved due to the contact between the bumps 3 on the outermost conductive wirings 14 and the electrode pad 8 , the conductivity of the conductive wirings 2 can be retained.
- the outermost conductive wiring 14 is designed so as to protrude from the designed position for the bump 3 by an amount greater than a displacement that may occur in the step of forming the bump 3 .
- the protrusion of the bump 3 from the designed position can be set not to exceed 300 ⁇ m, which has been proved through experiments to be sufficiently effective.
- dummy conductive wirings can be provided as extensions of the outermost conductive wirings 14 outside the bumps 3 in the region for mounting a semiconductor chip.
- the dummy conductive wiring portions are not connected to the bumps 3 but they are formed to have the same pattern as the adjacent conductive wirings 2 .
- the conductive wirings at the corners of the semiconductor chip 4 have the substantially same pattern, and the thermal expansion of the circuit board will be even at the time of mounting the semiconductor chip 4 irrespective of the locations.
- locational displacement between the bumps 3 and the electrode pads 8 at the time of joining can be avoided.
- FIG. 4 is a plan view showing a region for mounting a semiconductor chip of a tape carrier substrate in the third embodiment.
- the outermost conductive wirings 15 placed at positions corresponding to the outermost corners of the semiconductor chip 4 have different structures from those of the other ordinary conductive wirings 2 .
- each of the outermost conductive wirings 15 has at least one bent portion 15 a at any position between the bump 3 and the periphery of the region for mounting the semiconductor chip 4 .
- the opposite end portion of the outermost conductive wiring 15 positioned inside the region for mounting the semiconductor chip 4 has the same structure as the ordinary conductive wiring 2 .
- breaks in outermost conductive wirings can be suppressed at the time of mounting a semiconductor chip on a circuit board, thereby a reliable semiconductor device can be provided.
Abstract
A circuit board including a flexible insulating substrate, a plurality of conductive wirings placed in line on the flexible insulating substrate, and bumps provided at end portions of the respective conductive wirings positioned in a region for mounting a semiconductor chip is provided. The circuit board further includes an auxiliary conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip, being adjacent to and an outside the outermost conductive wiring, and an auxiliary bump formed on the auxiliary conductive wiring in line with the bumps on the conductive wirings. One end portion of the auxiliary conductive wiring is terminated at a position in the outside vicinity of the auxiliary bump in an outward direction of the region for mounting the semiconductor chip, and the auxiliary conductive wiring is bent at the other end portion positioned inside the auxiliary bump in an inward direction of the region for mounting the semiconductor chip, and connected to an end of the adjacent outermost conductive wiring. A break in the outermost conductive wiring, which is caused by concentrated stress at the time of joining the bumps of the circuit board and electrode pads of the semiconductor chip, can be suppressed.
Description
- This application is a division of U.S. Ser. No. 11/534,288, filed Sep. 22, 2006 which application is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a circuit board such as a tape carrier substrate used in a chip-on-film device (COF), and a semiconductor device formed by joining the circuit board and a semiconductor chip.
- 2. Description of Related Art
- As one type of package module using a film substrate, the one employing a COF structure has been known.
FIG. 5 is a cross-sectional view showing a part of one example of a COF described in JP 2004-327936 A. The COF includes asemiconductor chip 4 mounted on a tape carrier substrate of a flexible and insulating film substrate 1 and is protected by anencapsulation resin 5. Such a COF mainly is used as a driver for operating a flat panel display. - The tape carrier substrate includes as main components an insulating film substrate 1,
conductive wirings 2 formed on a surface of the film substrate 1 and upper surfaces ofbumps 3 on theconductive wirings 2. As required, ametal coating 6 is plated on some parts of theconductive wirings 2 and on thebumps 3, while a layer of solder resist 7 as an insulating resin is formed on the other parts of theconductive wirings 2. In general, polyimide is used as a material of the film substrate 1 and copper is used as a material of theconductive wirings 2. Thebumps 3 are formed in general by forming theconductive wirings 2 on the film substrate 1 and then plating a metal thereon. - The
conductive wirings 2 are connected to theelectrode pads 8 on thesemiconductor chip 4 via thebumps 3. In a typical connecting method, an encapsulation resin is applied on a region for mounting a semiconductor chip on the tape carrier substrate, and subsequently theelectrode pads 8 on thesemiconductor chip 4 and the bumps on the tape carrier substrate are placed opposing each other, to which ultrasonic waves, heat and pressure are applied. -
FIG. 6 is a plan view showing schematically an example where the electrode pads 8 on thesemiconductor chip 4 and thebumps 3 on the tape carrier substrate are placed opposing each other. It should be noted that the film substrate 1 is not shown in the drawing when viewed from the film substrate 1 side, for viewability. As shown inFIG. 6 , typically the pluralconductive wirings 2 on the region for mounting thesemiconductor chip 4 are straight and parallel to each other. - As mentioned above, when mounting the semiconductor chip on the tape carrier substrate, the
electrode pads 8 on thesemiconductor chip 4 and thebumps 3 on the tape carrier substrate are subjected to ultrasonic waves, heat and pressure. At that time, stresses caused by the ultrasonic waves and the pressure will be concentrated particularly on the corner areas of thesemiconductor chip 4, and thus the outermostconductive wirings 2 will be broken easily.FIG. 7 shows a break in aconductive wiring 2 at one corner of thesemiconductor chip 4. As shown inFIG. 7 , such abreak 9 in theconductive wiring 2 will occur most in abump 3 along the periphery side on thesemiconductor chip 4. - In order to cope with the problem, for example, the outermost
conductive wirings 2 are made thicker than the remainingconductive wirings 2. In such a case, however, since thebumps 3 are formed by plating a metal after formation of theconductive wirings 2, thebumps 3 on the outermostconductive wirings 2 will become taller than thebumps 3 of the otherconductive wirings 2. This causes a level difference among thebumps 3 and results in connection failure. Therefore, this measure is not suitable for mounting thesemiconductor chip 4. - Moreover, if the
conductive wirings 2 become narrow due to the future trend of making the lead pitch narrower, the above-mentionedbreak 9 will occur more easily, and it can cause problems. - Therefore, with the foregoing in mind, it is an object of the present invention to provide a circuit board that can suppress a break in an outermost conductive wiring, which is caused by concentrated stress at the time of joining bumps on a circuit board and electrode pads on a semiconductor chip.
- The circuit board of the present invention includes, as basic components, a flexible insulating substrate, a plurality of conductive wirings formed in line on the flexible insulating substrate, and bumps provided at the end portions of the respective conductive wirings positioned in a region for mounting a semiconductor chip, on which the semiconductor chip can be mounted by bonding electrode terminals formed on the semiconductor chip to the bumps.
- For achieving the above-mentioned object, a circuit board of the present invention according to a first configuration includes further an auxiliary conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip, being adjacent to and outside the outermost conductive wiring, and an auxiliary bump formed on the auxiliary conductive wirings in line with the bumps on the conductive wirings, wherein one end portion of the auxiliary conductive wiring is terminated at a position in the outside vicinity of the auxiliary bump in an outward direction of the region for mounting the semiconductor chip, and the auxiliary conductive wiring is bent at the other end portion positioned inside the auxiliary bump in an inward direction of the region for mounting the semiconductor chip, and connected to an end of an adjacent outermost conductive wiring.
- In a circuit board of the present invention according to a second configuration, one end portion of the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated in the outside vicinity of the bump in an outward direction of the region for mounting the semiconductor chip, and the outermost conductive wiring is bent at a position inside the bump in the region for mounting the semiconductor chip so as to cross a side edge of the region for mounting the semiconductor chip adjacent to a side edge where the bumps are arranged and to extend outwards.
- In a circuit board of the present invention according to a third configuration, each outermost conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip has at least one bent portion at a position between the bump and the periphery of the region for mounting the semiconductor chip.
-
FIG. 1 is a plan view showing a part of a tape carrier substrate in a first embodiment of the present invention. -
FIG. 2 is a plan view showing a variation at a part of the tape carrier substrate. -
FIG. 3 is a plan view showing a part of a tape carrier substrate in a second embodiment of the present invention. -
FIG. 4 is a plan view showing a part of a tape carrier substrate in a third embodiment of the present invention. -
FIG. 5 is a cross-sectional view showing a part of a semiconductor device including a conventional tape carrier substrate. -
FIG. 6 is a plan view showing a part of a conventional tape carrier substrate. -
FIG. 7 is a plan view showing a part of a conventional semiconductor device. - A circuit board according to a first configuration of the present invention includes an auxiliary conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip, being adjacent to and outside the outermost conductive wiring, and an auxiliary bump formed on the auxiliary conductive wiring in line with the bumps on the conductive wirings. One end portion of the auxiliary conductive wiring is terminated at a position in the outside vicinity of the auxiliary bump in an outward direction of the region for mounting the semiconductor chip, and the auxiliary conductive wiring is bent at the other end portion positioned inside the auxiliary bump in an inward direction of the region for mounting the semiconductor chip, and connected to an end of an adjacent outermost conductive wiring. Therefore, concentration of stress on the outermost conductive wiring can be relieved due to the arrangement of the auxiliary bump, and a break in the wiring can be suppressed.
- In this specification, “auxiliary conductive wiring” means the wiring provided in a form different from the other normal conductive wirings.
- It is preferable in the circuit board according to the first configuration that the auxiliary conductive wiring is terminated at a position outside the auxiliary bump, with a length beyond the auxiliary bump being more than 0 μm and less than 300 μm.
- It is also preferable that a dummy conductive wiring is provided along an extension from the end of the auxiliary conductive wiring in an outward direction of the region for mounting the semiconductor chip, the dummy conductive wiring being discontinuous from the auxiliary conductive wiring.
- In a circuit board according to a second configuration of the present invention, one end portion of the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated in the outside vicinity of the bump in an outward direction of the region for mounting the semiconductor chip, and the outermost conductive wiring is bent at a position inside the bump in the region for mounting the semiconductor chip so as to cross a side edge of the region for mounting the semiconductor chip adjacent to a side edge where the bumps are arranged and to extend outwards. Accordingly, it is avoided to form a wiring at a region of the outermost conductive wiring on which stress will be concentrated, and a wiring for the region is formed into a different pattern, thereby a break in wiring caused by the concentration of stress can be avoided.
- In the circuit board according to the second configuration of the present invention, it is preferable that the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated at a position outside the bump, with a length beyond the bump being more than 0 μm and less than 300 μm.
- It is also preferable that a dummy conductive wiring is provided along extension from the end of the auxiliary conductive wiring in an outward direction of the region for mounting the semiconductor chip, the dummy conductive wiring being discontinuous from the auxiliary conductive wiring.
- In a circuit board according to a third configuration of a circuit board, each outermost conductive wiring positioned at an outermost corner of the region for mounting the semiconductor chip has at least one bent portion at a position between the bump and the periphery of the region for mounting the semiconductor chip. Since such a bent portion is provided at a position on which stress in the outermost conductive wiring will be concentrated, concentration of stress can be relieved to suppress a break in the wiring.
- A semiconductor device of the present invention includes a circuit board of any embodiments above and a semiconductor chip mounted on the circuit board, where electrode pads of the semiconductor chip and the respective conductive wirings are connected to each other via the bumps.
- Hereinafter, the present invention will be described by way of illustrative embodiments with reference to the drawings. Note that the members identical to those in the conventional example described with reference to
FIGS. 5-7 are assigned the same reference signs for avoiding a duplicated explanation. - The configuration of a tape carrier substrate (circuit board) in a first embodiment will be described with reference to
FIG. 1 .FIG. 1 is a plan view showing a region for mounting a semiconductor chip of the tape carrier substrate in the first embodiment. For viewability, the structure viewed from the film substrate 1 (seeFIG. 5 ) side is shown while the film substrate 1 is not shown inFIG. 1 , so as to indicate schematically the relationship betweenconductive wirings 2 withbumps 3 andelectrode pads 8 on asemiconductor chip 4. These components are indicated similarly in the following embodiments. - As shown in
FIG. 1 , thebumps 3 are formed respectively on the pluralconductive wirings 2 so as to correspond to theelectrode pads 8 on thesemiconductor chip 4. Auxiliaryconductive wirings 11 are placed outside outermostconductive wirings 10, namely, at positions corresponding to outermost corners of thesemiconductor chip 4, andauxiliary bumps 12 are formed thereon. One end portion of each of the auxiliaryconductive wirings 11 is terminated at a position in the outer side vicinity of theauxiliary bump 12 in an outward direction of the region for mounting thesemiconductor chip 4. The auxiliaryconductive wiring 11 is bent at the other end portion positioned inside theauxiliary bump 12 in an inward direction of the region for mounting thesemiconductor chip 4, and connected to the end of the adjacent outermostconductive wiring 10. However, each of the auxiliaryconductive wirings 11 can be connected to not only the adjacentconductive wiring 10 but a plurality of conductive wirings including any otherconductive wirings 2 placed on the same side of thesemiconductor chip 4. The auxiliaryconductive wirings 11 and theauxiliary bumps 12 are formed in the same manner as ordinaryconductive wirings 2 and bumps 3. - In the above-mentioned configuration, when the
electrode pads 8 on thesemiconductor chip 4 and thebumps 3 on the circuit board are connected to each other, stresses applied to the end portions of thebumps 3 at the outermostconductive wirings 10 are relieved by the adjacent auxiliary bumps 12. As having been proved through experiments, since the outermostconductive wirings 10 are hardly broken at positions inside theauxiliary bumps 12 in the region for mounting thesemiconductor chip 4, the conductivity of the conductive wirings can be retained. - Though not shown in the drawing, it is preferable that the auxiliary
conductive wiring 11 is designed so as to protrude from the designed position for thebump 3 by an amount greater than a displacement that may occur in the step of forming theauxiliary bump 12. The protrusion of thebump 3 from the designed position can be set not to exceed 300 μm, which has been proved through experiments to be sufficiently effective. -
FIG. 2 shows a variation of the embodiment as shown inFIG. 1 . In this example, dummyconductive wirings 13 are provided as the extensions of the auxiliaryconductive wirings 11, outside theauxiliary bumps 12 in the region for mounting the semiconductor chip. - The dummy
conductive wirings 13 are not connected to the auxiliary bumps 12 on the auxiliaryconductive wirings 11 but they are formed to have the same pattern as the adjacent outermostconductive wirings 10. In the configuration as shown inFIG. 2 , since the conductive wiring at each corner of the region for mounting thesemiconductor chip 4 has a substantially continuous pattern, the thermal expansion of the circuit board will be even at the time of mounting thesemiconductor chip 4 irrespective of the locations. As a result, the local displacement between thebumps 3 and theelectrode pads 8 at the time of joining can be avoided. Though not shown in the drawing, the dummyconductive wirings 13 can be connected to the outermostconductive wirings 10 or any otherconductive wirings 2 outside the region shown in the drawing. - The configuration of a tape carrier substrate (circuit board) in a second embodiment will be described with reference to
FIG. 3 .FIG. 3 is a plan view showing a region for mounting a semiconductor chip of a tape carrier substrate in the second embodiment. - In this embodiment, outermost
conductive wirings 14 placed at positions corresponding to the outermost corners of thesemiconductor chip 4 have structures different from those of the other ordinaryconductive wirings 2. Namely, one end portion of each of the outermostconductive wirings 14 is terminated at a position in the outer side vicinity of abump 3 in an outward direction of the region for mounting the semiconductor chip 4 (upward in the drawing). The outermostconductive wiring 14 is bent at a position inside thebump 3 in an inward direction of the region for mounting thesemiconductor chip 4 so as to cross a side edge of the region for mounting the semiconductor chip 4 (right or left in the drawing) adjacent to a side edge where thebump 3 is arranged, and it extends outwards to form abent wiring portion 14 a. - In this configuration, since the outermost
conductive wirings 14 are hardly broken at positions inside thebumps 3 on thesemiconductor chip 4, the conductivity of the outermostconductive wirings 14 can be retained. Moreover, since stresses applied to theconductive wirings 2 adjacent to the outermostconductive wirings 14 can be relieved due to the contact between thebumps 3 on the outermostconductive wirings 14 and theelectrode pad 8, the conductivity of theconductive wirings 2 can be retained. - Though not shown in the drawing, it is preferable that the outermost
conductive wiring 14 is designed so as to protrude from the designed position for thebump 3 by an amount greater than a displacement that may occur in the step of forming thebump 3. The protrusion of thebump 3 from the designed position can be set not to exceed 300 μm, which has been proved through experiments to be sufficiently effective. - Furthermore, though not shown in the drawing, similarly to the case as shown in
FIG. 2 , dummy conductive wirings can be provided as extensions of the outermostconductive wirings 14 outside thebumps 3 in the region for mounting a semiconductor chip. The dummy conductive wiring portions are not connected to thebumps 3 but they are formed to have the same pattern as the adjacentconductive wirings 2. Thereby, the conductive wirings at the corners of thesemiconductor chip 4 have the substantially same pattern, and the thermal expansion of the circuit board will be even at the time of mounting thesemiconductor chip 4 irrespective of the locations. As a result, locational displacement between thebumps 3 and theelectrode pads 8 at the time of joining can be avoided. - The configuration of a tape carrier substrate (circuit board) in a third embodiment will be described with reference to
FIG. 4 .FIG. 4 is a plan view showing a region for mounting a semiconductor chip of a tape carrier substrate in the third embodiment. - In this embodiment, the outermost
conductive wirings 15 placed at positions corresponding to the outermost corners of thesemiconductor chip 4 have different structures from those of the other ordinaryconductive wirings 2. Namely, each of the outermostconductive wirings 15 has at least onebent portion 15 a at any position between thebump 3 and the periphery of the region for mounting thesemiconductor chip 4. The opposite end portion of the outermostconductive wiring 15 positioned inside the region for mounting thesemiconductor chip 4 has the same structure as the ordinaryconductive wiring 2. - In this configuration, since the stresses applied to the
bumps 3 of the outermostconductive wirings 15 are relieved by thebent portions 15 a, the conductivity of the outermostconductive wirings 15 can be retained. Furthermore, since the stresses applied to theconductive wirings 2 adjacent to the outermostconductive wirings 15 are relieved as well due to the contact between thebumps 3 on the outermostconductive wirings 15 and theelectrode pads 8, conductivity of theconductive wirings 2 can be retained. - According to the above-mentioned embodiments, breaks in outermost conductive wirings can be suppressed at the time of mounting a semiconductor chip on a circuit board, thereby a reliable semiconductor device can be provided.
- The invention may be embodied in other forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed in this application are to be considered in all respects as illustrative and not limiting. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Claims (5)
1.-3. (canceled)
4. A circuit board comprising:
a flexible insulating substrate,
a plurality of conductive wirings formed in line on the flexible insulating substrate, and
bumps provided at the end portions of the respective conductive wirings positioned in a region for mounting a semiconductor chip, on which the semiconductor chip can be mounted by bonding electrode terminals formed on the semiconductor chip to the bumps;
wherein one end portion of the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated in the outside vicinity of the bump in an outward direction of the region for mounting the semiconductor chip, and the outermost conductive wiring is bent at a position inside the bump in the region for mounting the semiconductor chip so as to cross a side edge of the region for mounting the semiconductor chip adjacent to a side edge where the bumps are arranged and to extend outwards.
5. The circuit board according to claim 4 , wherein the outermost conductive wiring positioned at the outermost corner of the region for mounting the semiconductor chip is terminated at a position outside the bump, with a length beyond the bump being more than 0 μm and less than 300 μm.
6. The circuit board according to claim 4 , wherein a dummy conductive wiring is provided along extension from the end of the auxiliary conductive wiring in an outward direction of the region for mounting the semiconductor chip, the dummy conductive wiring being discontinuous from the auxiliary conductive wiring.
7.-10. (canceled)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/283,043 US20090020318A1 (en) | 2005-09-30 | 2008-09-09 | Circuit board, and semiconductor device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-287854 | 2005-09-30 | ||
JP2005287854A JP4740708B2 (en) | 2005-09-30 | 2005-09-30 | Wiring board and semiconductor device |
US11/534,288 US7439611B2 (en) | 2005-09-30 | 2006-09-22 | Circuit board with auxiliary wiring configuration to suppress breakage during bonding process |
US12/283,043 US20090020318A1 (en) | 2005-09-30 | 2008-09-09 | Circuit board, and semiconductor device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/534,288 Division US7439611B2 (en) | 2005-09-30 | 2006-09-22 | Circuit board with auxiliary wiring configuration to suppress breakage during bonding process |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090020318A1 true US20090020318A1 (en) | 2009-01-22 |
Family
ID=37901126
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/534,288 Active 2027-02-27 US7439611B2 (en) | 2005-09-30 | 2006-09-22 | Circuit board with auxiliary wiring configuration to suppress breakage during bonding process |
US12/283,043 Abandoned US20090020318A1 (en) | 2005-09-30 | 2008-09-09 | Circuit board, and semiconductor device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/534,288 Active 2027-02-27 US7439611B2 (en) | 2005-09-30 | 2006-09-22 | Circuit board with auxiliary wiring configuration to suppress breakage during bonding process |
Country Status (5)
Country | Link |
---|---|
US (2) | US7439611B2 (en) |
JP (1) | JP4740708B2 (en) |
KR (1) | KR20070037310A (en) |
CN (1) | CN1941353A (en) |
TW (1) | TW200721427A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130127819A1 (en) * | 2008-06-03 | 2013-05-23 | Sony Corporation | Display device, method of laying out wiring in display device, and electronic device |
Families Citing this family (9)
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JP5164523B2 (en) * | 2006-12-15 | 2013-03-21 | キヤノン株式会社 | Inkjet recording head |
JP4994968B2 (en) * | 2007-06-21 | 2012-08-08 | キヤノン株式会社 | Inkjet printhead manufacturing method |
KR101468875B1 (en) * | 2008-03-14 | 2014-12-10 | 삼성전자주식회사 | Flip Chip Package |
KR102299697B1 (en) | 2019-05-09 | 2021-09-08 | 한국화학연구원 | A process for producing asphalt having less odor vapors and hazardous substances using additives possessing both polar and non-polar functional groups |
KR102201116B1 (en) | 2019-01-23 | 2021-01-08 | 한국화학연구원 | A process for reducing hazardous substances such as odor vapors and particle matters from asphalt and the system thereof |
KR102176906B1 (en) | 2019-04-16 | 2020-11-10 | 인성에이앤티 주식회사 | Apparatus for removing bad smell of ascon and method the same |
KR102458793B1 (en) | 2019-11-18 | 2022-10-25 | 김영중 | Offensive odor and dust removal method generated during ascon manufacturing process |
KR20240001549A (en) * | 2022-06-27 | 2024-01-03 | 엘지이노텍 주식회사 | Flexible printed circuit board, cof module and electronic device comprising the same |
KR102493032B1 (en) | 2022-07-15 | 2023-01-31 | 주식회사 메트로엔지니어링 | Gravel circulation dry electrostatic precipitator |
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- 2006-09-08 TW TW095133141A patent/TW200721427A/en unknown
- 2006-09-22 US US11/534,288 patent/US7439611B2/en active Active
- 2006-09-28 CN CNA2006101399832A patent/CN1941353A/en active Pending
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US8988415B2 (en) * | 2008-06-03 | 2015-03-24 | Sony Corporation | Display device, method of laying out wiring in display device, and electronic device |
Also Published As
Publication number | Publication date |
---|---|
TW200721427A (en) | 2007-06-01 |
US7439611B2 (en) | 2008-10-21 |
KR20070037310A (en) | 2007-04-04 |
JP2007103431A (en) | 2007-04-19 |
CN1941353A (en) | 2007-04-04 |
US20070075439A1 (en) | 2007-04-05 |
JP4740708B2 (en) | 2011-08-03 |
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