Source: https://patents.google.com/patent/US7122896
Timestamp: 2018-07-22 13:17:08
Document Index: 605433691

Matched Legal Cases: ['art 111', 'art 111', 'art 111', 'art 111', 'art 111', 'art 111']

US7122896B2 - Mounting structure of electronic component, electro-optic device, electronic equipment, and method for mounting electronic component - Google Patents
Mounting structure of electronic component, electro-optic device, electronic equipment, and method for mounting electronic component Download PDF
US7122896B2
US7122896B2 US10914121 US91412104A US7122896B2 US 7122896 B2 US7122896 B2 US 7122896B2 US 10914121 US10914121 US 10914121 US 91412104 A US91412104 A US 91412104A US 7122896 B2 US7122896 B2 US 7122896B2
US10914121
US20050062153A1 (en )
To provide a low cost mounting structure of an electronic component and to increase the reliability of the conductive connection between a bump electrode and a terminal formed on a substrate, in the mounting structure of the electronic component, the bump electrode includes a core composed of an inner resin and a conductive film covering the surface of the core. The bump electrode is brought into conductive contact with the terminal directly and is elastically deformed to make contact with the face of the substrate in a planar manner. A sealing resin is filled in around the conductive contact portion between the bump electrode and the terminal to hold the bump electrode and the terminal.
In the production of a related art liquid crystal display device having the COG structure, an IC chip is mounted as follows. As shown in FIG. 11, a liquid crystal-driving IC chip 21 is disposed on an array portion of indium tin oxide (ITO) terminals 11 bx and 11 dx composed of a transparent conductor on a glass substrate 11 through an anisotropic conductive film (ACF) 22 in which conductive particles 22 a are dispersed in a thermosetting resin 22 b. Metal bump electrodes 21B disposed on the liquid crystal-driving IC chip 21 are brought into conductive contact with the ITO terminals 11 bx and 11 dx on the glass substrate 11 through the conductive particles 22 a by pressing the liquid crystal-driving IC chip 21 while heating. This conductive contact is maintained with the cured thermosetting resin 22 b.
In general, in order to increase the reliability of the conductive connection between the metal bump electrodes 21B on the liquid crystal-driving IC chip 21 and the ITO terminals 11 bx and 11 dx on the glass substrate 11, the conductive particles 22 a disposed therebetween must be elastically deformed by pressing to some extent. The reason for this is that even if the thermosetting resin 22 b is thermally expanded to some extent by a temperature change, the conductive contact through the conductive particles 22 a must be maintained. In general, however, it is very difficult to provide the conductive particles 22 a with a sufficient amount of elastic deformation so as to enhance the reliability of the conductive connection. Therefore, in a method for increasing the reliability of the conductive connection, the use of conductive particles composed of a conductive rubber is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 5-182516.
According to an exemplary aspect of the present invention, the bump electrode is brought into conductive contact with the terminal directly. The bump electrode may be elastically deformed by pressing in the contact direction in the temperature range from +80° C. to +300° C.
Since the bump electrode is pressed in the temperature range from +80° C. to +300° C., the elastic deformation of the inner resin is increased. Therefore, the elastic deformation is satisfactorily maintained. This structure provides a sufficient conductive contact and high electrical reliability.
According to an exemplary aspect of the present invention, the bump electrode is brought into conductive contact with the terminal directly. The bump electrode may be elastically deformed by pressing in the contact direction in the temperature range at least from −40° C. to +80° C.
Since the elastic deformation of the bump electrode is maintained in the temperature range at least from −40° C. to +80° C., a sufficient conductive contact is provided in the general operating temperature range. Accordingly, high electrical reliability is achieved.
According to an exemplary aspect of the present invention, mathematical formula 1 may be satisfied in the temperature range at least from −40° C. to +80° C.:
Δ ⁢ ⁢ t > ∫ To To + Δ ⁢ ⁢ T ⁢ Δα ⁢ ⁢ t ⁢ ⁢ ⅆ T
where Δα represents the difference in the thermal expansion coefficient calculated by subtracting the thermal expansion coefficient α of the inner resin from the thermal expansion coefficient α′ of the sealing resin; t represents a height of the inner resin at a reference temperature To set in the temperature range from −40° C. to +80° C.; Δt represents an elastic deformation of the bump electrode at the reference temperature To; and ΔT represents the difference in temperature calculated by subtracting the reference temperature To from a certain temperature T.
In this case, the difference in the thermal expansion between the inner resin having a height t and the sealing resin caused by a temperature change is less than the elastic deformation Δt. Therefore, even if the temperature is changed in the above temperature range, the elastic deformation of the bump electrode is maintained. When the difference Δα=α′−α in the thermal expansion coefficient does not depend on the temperature T, the above formula is represented by formula Δt>Δα·t·ΔT.
According to an exemplary aspect of the present invention, formula 200 [MPa]·t′/E>Δt may be satisfied in the temperature range at least from −40° C. to +80° C., wherein E represents the compression modulus of the inner resin and t′ represents the initial height of the inner resin. In this case, the stress between the bump electrode and the substrate, which is caused by the elastic deformation Δt, i.e., the stress σ represented by formula σ=εE=(Δt/t)E (wherein ε represents strain) can be maintained less than 200 [MPa]. Accordingly, problems, for example, the breaking of the base structure due to the elastic deformation Δt of the bump electrode, can be reduced or prevented.
According to an exemplary aspect of the present invention, the compression modulus E of the inner resin during pressing into contact may be 10 to 100 MPa. When the compression modulus E is within the above range, sufficient elastic deformation Δt for to maintain the elastic deformation state in the temperature range (from +80° C. to +300° C.) during pressing with heat is provided. Furthermore, in the above temperature range, sufficient contact pressure between the bump electrode and the terminal is provided without problems, such as the breaking of the inner conductive film due to excessive deformation. Accordingly, electrical reliability is provided. In addition, the deformation can be controlled within the range of elastic deformation.
According to an exemplary aspect of the present invention, the compression modulus E of the inner resin during pressing into contact may be 100 to 15,000 MPa. When the compression modulus E is within the above range, sufficient elastic deformation Δt for maintaining the elastic deformation state in the general operating temperature range (from −40° C. to +80° C.) is reliably provided by applying a stress less than 200 MPa. Accordingly, electrical reliability is provided. Also, problems due to an excessive stress can be reduced or prevented. When the compression modulus E exceeds 15,000 MPa, it is difficult to provide sufficient elastic deformation Δt. In this case, the stress to provide sufficient elastic deformation Δt becomes excessive. This excessive stress causes problems, such as the breaking of the mounting structure. When the compression modulus E in the operating temperature range from −40° C. to +80° C. during pressing into contact is less than 100 MPa, the deformation becomes excessive. In this case, for example, the conductive film covering the inner resin is broken. In addition, sufficient contact pressure between the bump electrode and the terminal is not provided, and electrical reliability is decreased. Furthermore, the deformation is difficult to be controlled within the range of elastic deformation.
According to an exemplary aspect of the present invention, the elastic deformation of the bump electrode may be controlled by the pressure during mounting such that the state of elastic deformation of the bump electrode is maintained in the temperature range at least from −40° C. to +80° C.
FIG. 1 is a schematic showing a structure of a liquid crystal display device according to an exemplary embodiment of the present invention;
FIG. 10 includes graphs showing the dependency of the difference Δα·t·ΔT in the thermal expansion to the temperature T;
Mounting Structure of Electronic Component and Electro-Optic Device
The electrode 111 a is connected to wiring 111 b, which is formed as the same component and is composed of the same material as the electrode 111 a. The electrode 111 a connected to the wiring 111 b is further extended on the inner face of a substrate-protruding part 111T of the substrate 111. The substrate-protruding part 111T is an end of the substrate 111 where the substrate 111 is protruded outside from the periphery of the substrate 112. The leading end of the wiring 111 b forms a terminal 111 bx. The electrode 112 a is also connected to wiring 112 b, which is formed as the same component and is composed of the same material as the electrode 112 a. The electrode 112 a connected to wiring 112 b is conductively connected with wiring 111 c on the substrate 111 through a vertical conducting portion (not shown in the figure). This wiring 111 c is also composed of the same ITO as described above. The wiring 111 c is extended on the substrate-protruding part 111T, and the leading end of the wiring 111 c forms a terminal 111 cx. Input wiring 111 d is disposed at the edge of the substrate-protruding part 111T. The inner part of the input wiring 111 d forms a terminal 111 dx, which is disposed facing the terminals 111 bx and 111 cx. The outer part of the input wiring 111 d forms an input terminal 111 dy.
The electronic component 121 is mounted on the substrate-protruding part 111T using a sealing resin 122 composed of an uncured (A stage) or a semi-cured (B stage) thermosetting resin. This electronic component 121 is, for example, a liquid crystal-driving IC chip to drive the liquid crystal panel 110. A large number of bump electrodes (not shown in the figure) are disposed on the undersurface of the electronic component 121. These bump electrodes are conductively connected with the terminals 111 bx, 111 cx, and 111 dx on the substrate-protruding part 111T.
FIG. 2 is a schematic showing the mounting structure of the electronic component 121 in the above liquid crystal display device 100. A number of bump electrodes 121B, which are terminals adjacent to the IC, are disposed on the surface (the undersurface in the figure) of the electronic component 121. The ends of the bump electrodes 121B are brought into conductive contact with the terminals 111 bx, 111 cx, and 111 dx (the terminal 111 cx is not shown in the figure, see FIG. 1, and so forth) of the substrate 111 directly. A cured sealing resin 122 composed of, for example, a thermosetting resin is filled in around the conductive contact portion between the bump electrodes 121B and the terminals 111 bx, 111 cx, and 111 dx.
FIG. 3 is a schematic showing the structure of the electronic component 121 before mounting.
In general, the width w of the top portion 121Bp of the bump electrode 121B after the mounting and an elastic deformation, i.e. Δt=t′−t, has a proportionality or another positive correlation. Therefore, the measurement of the width w provides an estimation of the elastic deformation Δt. Of course, after being mounted, a sample may be cut to observe the cross-section thereof with a microscope. Thus, the elastic deformation Δt can be directly measured. The elastic deformation Δt can be adjusted by changing the pressure P during mounting. FIG. 6 shows the relationship between the pressure P (stress) during mounting and the elastic deformation Δt and the relationship between the pressure P (stress) during mounting and the width w. As shown by the two-dot chain line in the figure, the measurement of a width wx provides an estimation of an elastic deformation Δtx. Furthermore, the relationship between the pressure P and the elastic deformation Δt during mounting is shown by the curve in the figure. Therefore, if this relationship is measured in advance, the elastic deformation Δt during mounting can be adjusted by controlling the pressure P. Since the above elastic deformation Δt is changed depending on the temperature, in this specification, an elastic deformation measured at a temperature To (hereinafter “reference temperature”) is defined as the elastic deformation Δt. Of course, the temperature during mounting and the reference temperature may be different. The pressure P is determined in view of the difference.
According to the present exemplary embodiment, the bump electrode 121B is elastically deformed in the contact direction within the temperature range at least from −40° C. to +80° C., which is the general operating temperature range. In the above mounting structure, the following symbols are defined as follows. Δt a reference temperature To that is appropriately set in the temperature range from −40° C. to +80° C., t represents the height of the inner resin 121Ba, Δt represents the elastic deformation of the inner resin 121Ba, a represents the thermal expansion coefficient of the inner resin 121Ba, and α′ represents the thermal expansion coefficient of the sealing resin 122. If the thermal expansion coefficients α and α′ are constant with the temperature, at a certain temperature T in the above temperature range, a thermal expansion of the inner resin 121Ba is represented by α·t·αT and a thermal expansion of the sealing resin 122 portion corresponding to the height of the inner resin 121Ba is represented by α′·t·ΔT, where ΔT=T−To. Accordingly, the difference in the thermal expansion calculated by subtracting the thermal expansion of the inner resin 121Ba from the thermal expansion of the sealing resin 122 is represented by Δα·t·αT, wherein Δα=α′−α.
Accordingly, when formula Δt>Δα·t·ΔT . . . (1) is satisfied, at the certain temperature T, the difference Δα·t·ΔT in the thermal expansion is smaller than the elastic deformation Δt at the reference temperature To. In this case, a state where the bump electrode 121B is elastically deformed is maintained. This situation will now be described more specifically. Firstly, when the certain temperature T is higher than the reference temperature To, the relationships between the difference Δα·t·ΔT in the thermal expansion and the temperature T are as follows. When the thermal expansion coefficient of the sealing resin is larger than that of the inner resin (α<α′), the difference Δα·t·ΔT in the thermal expansion is positive and is increased as the temperature T is increased. When the thermal expansion coefficient of the sealing resin is smaller than that of the inner resin (α>α′), the difference Δα·t·ΔT in the thermal expansion is negative and is decreased as the temperature T is increased. Secondly, when the certain temperature T is lower than the reference temperature T, the relationships between the difference Δα·t·ΔT in the thermal expansion and the temperature T are as follows. When the thermal expansion coefficient of the sealing resin is larger than that of the inner resin (α<α′), the difference Δα·t·ΔT in the thermal expansion is negative and is decreased as the temperature T is decreased. When the thermal expansion coefficient of the sealing resin is smaller than that of the inner resin (α>α′), the difference Δα·t·ΔT in the thermal expansion is positive and is increased as the temperature T is decreased.
According to the present exemplary embodiment, formula (1) is satisfied in the temperature range at least from −40° C. to +80° C. FIG. 10 shows this relationship. In FIG. 10, the abscissa represents the temperature T [° C.] and the ordinate represents the difference Δα·t·ΔT in the thermal expansion. The elastic deformation Δt shown in the figure represents the elastic deformation of a bump electrode 121B at the reference temperature To. Although the reference temperature To may be any temperature in the above temperature range, the reference temperature To is generally a room temperature, for example, 20° C. FIG. 10 separately shows graph A and graph B. Graph A shows case A in which the thermal expansion coefficient of the sealing resin is larger than that of the inner resin (α<α′). Graph B shows case B in which the thermal expansion coefficient of the sealing resin is smaller than that of the inner resin (α>α′). In each of case A and case B, the slope in graph A and graph B is proportional to the absolute value of the difference Δc in the thermal expansion coefficient. When the thermal expansion coefficient of the inner resin and that of the sealing resin are substantially the same value, graph A and graph B become substantially horizontal. In this case, the absolute value of the difference Δα·t·ΔT in the thermal expansion is close to zero and the value hardly depends on the temperature.
Referring to both graph A and graph B shown in FIG. 10, in the temperature range at least from −40° C. to +80° C., the difference Δα·t·ΔT in the thermal expansion is less than the elastic deformation Δt at the reference temperature To. In each of case A and case B, when the slope of the graph, i.e., the absolute value of the difference Δα in the thermal expansion coefficient is small on some level, it is easy to maintain the elastic deformation of the bump electrode 121B at least in the above temperature range. According to the present exemplary embodiment, the elastic deformation Δt of the bump electrode 121B at the reference temperature To is controlled such that the elastic deformation Δt is larger than the difference Δα·t·ΔT in the thermal expansion in the temperature range at least from −40° C. to +80° C. In this case, if the difference Δα in the thermal expansion coefficient between the inner resin and the sealing resin is small, the elastic deformation Δt can be controlled to a small value. Accordingly, the pressure P during the mounting can be controlled to a small value.
When the lower limit of the above temperature range (for example, −40° C.) is used as the reference temperature To, the following formula is used. When a width δT in the above temperature range (for example, 80° C.–(−40° C.)=120° C.) is used, it is sufficient that formula (1) is satisfied at the upper limit of the above temperature range. Accordingly, formula Δt>Δα·t·δT . . . (2) can be used. In this case, when formula (2) is satisfied, the bump electrode 121B is elastically deformed for the above entire temperature range.
In this case, the difference Δα in the thermal expansion coefficient is used in formula (2). In reality, however, when formula Δt>α′·t·δT . . . (3) (wherein only the thermal expansion coefficient α′ of the sealing resin is used instead of Δα) is satisfied, a reliable conductive connection can be satisfactorily maintained.
That is, instead of the difference Δα·t·ΔT in the thermal expansion, a value may be used in which Δα·t is integrated with respect to temperature T from a reference temperature To a certain temperature T=To+ΔT. In this formula, the use of δT instead of ΔT provides an expanded formula of formula (2). Furthermore, the use of α′ and δT instead of Δα and ΔT, respectively, provides an expanded formula of formula (3).
Under the above conditions, the lower limit of the elastic deformation Δt of the bump electrode 121B at the reference temperature To is determined by the difference Δα·t·ΔT in the thermal expansion in the above temperature range. Accordingly, the larger elastic deformation Δt is more preferable. In reality, however, the elastic deformation Δt has an upper limit because the initial height t′ of the inner resin 121Ba is used as the standard. For example, as the elastic deformation Δt is increased, the pressure P during the mounting is also increased. Therefore, a part of the mounting structure is unfortunately broken by the pressure P.
In general, when the pressure P (stress) exceeds 200 [MPa], for example, the protective film 121 b and a silicon substrate in a semiconductor IC are broken with a strong possibility. Therefore, formula 200 [MPa]·t′/E>Δt . . . (4), where E represents a compression modulus (i.e., compressive elastic modulus) of the inner resin 121Ba, is preferably satisfied. Since stress σ is represented by formula ε=σ·E (wherein ε represents strain), the strain ε corresponding to the stress σ is represented by formula ε=σ/E. Therefore, the amount of compression corresponding to the stress σ is represented by formula ε·t′=σ·t′/E. Accordingly, when formula (4) is satisfied, the elastic deformation Δt is smaller than the amount of compression corresponding to the stress of σ=200 [MPa]. Consequently, the likelihood of the breaking of the mounting structure can be reduced or eliminated.
In the calculation of formula (4) regarding a mounting structure that has been already formed, when the elastic deformation Δt is sufficiently smaller than the height of the inner resin 121Ba, the initial height t′ may be replaced with the height t after the mounting. This replacement hardly affects the value. Accordingly, it suffices only to satisfy formula 200 [MPa]·t/E>Δt . . . (5).
Resin Elastic modulus [MPa]
Silicone resin 100–1,000
Polyimide resin 2,000–3,000
Acrylic resin 2,000–3,000
Epoxy resin 3,000–4,000
Epoxy resin 3,000–15,000
w′ = 20 μm Width (diameter) of top
t′ = 20 μm Initial height of inner resin
α′ = 60 ppm/° C. Thermal expansion coefficient
δT = 120° C. Width of temperature range in
Elastic modulus E Upper limit of Elastic elastic
of resin used elastic deformation deformation deformation
100 MPa 20 μm or more Δt = t′−t 0.144 μm
2,000 MPa 2 μm
4,000 MPa 1 μm
15,000 MPa 0.267 μm
The thermal expansion coefficient of the inner resin and the sealing resin significantly depends on the manufacturing conditions and additives, even if the resins are composed of the same kind of base resin. For example, among the resins shown in Table 1, a relatively soft resin, such as a silicone resin, a polyimide resin, or an acrylic resin has a thermal expansion coefficient of about 60 to about 200 ppm/° C. and a relatively hard resin, such as an epoxy resin has a thermal expansion coefficient of about 10 to about 60 ppm/° C. In particular, as described above, the use of inner resin and sealing resin having the similar thermal expansion coefficient decreases the value Δα. Thus, the elastic deformation of the bump electrode can be reliably maintained in a wide temperature range. For this purpose, an epoxy resin is used as the inner resin and the sealing resin.
Although the bump electrode 121B is elastically deformed in the contact direction in the operation temperature range from −40° C. to +80° C. in the present exemplary embodiment, the present invention is not limited to the above. The bump electrode 121B may be heated and pressed into contact in the temperature range from +80° C. to +300° C. In this case, the compression modulus E of the inner resin 121Ba during pressing into contact maybe 10 to 100 MPa.
the bump electrode being brought into conductive contact with the terminal directly, and the bump electrode being elastically deformed by pressing in a contact direction in a temperature range from +80° C. to +300° C.
the bump electrode being brought into conductive contact with the terminal directly, and the bump electrode being elastically deformed by pressing in a contact direction in a temperature range at least from −40° C. to +80° C.
10. The mounting structure of an electronic component according to claim 9, a mathematical formula 1 being satisfied in the temperature range at least from −40° C. to +80° C.:
Δα representing a difference in a thermal expansion coefficient calculated by subtracting a thermal expansion coefficient α of the inner resin from a thermal expansion coefficient α′ of the sealing resin, t representing a height of the inner resin at a reference temperature To set in the temperature range from −40° C. to +80° C., At representing an elastic deformation of the bump electrode at the reference temperature To, and ΔT representing a difference in temperature calculated by subtracting the reference temperature To from a certain temperature T.
13. The mounting structure of an electronic component according to claim 10, formula 200 [MPa]·t′/E>Δt being satisfied in the temperature range at least from −40° C. to +80° C., E representing a compression modulus of the inner resin and t′ representing an initial height of the inner resin.
controlling the elastic deformation of the bump electrode by the pressure during mounting such that the state of elastic deformation of the bump electrode is maintained in the temperature range at least from −40° C. to +80° C.
US10914121 2003-08-21 2004-08-10 Mounting structure of electronic component, electro-optic device, electronic equipment, and method for mounting electronic component Active US7122896B2 (en)
JP2003297654 2003-08-21
JP2003-297654 2003-08-21
JP2004184946A JP2005101527A (en) 2003-08-21 2004-06-23 Electronic component mounting structure, electrooptic device, electronic equipment, and method of mounting electronic component
JP2004-184946 2004-06-23
US20050062153A1 true US20050062153A1 (en) 2005-03-24
US7122896B2 true US7122896B2 (en) 2006-10-17
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US10914121 Active US7122896B2 (en) 2003-08-21 2004-08-10 Mounting structure of electronic component, electro-optic device, electronic equipment, and method for mounting electronic component
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JP (1) JP2005101527A (en)
KR (1) KR100639452B1 (en)
CN (1) CN100338738C (en)
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