CN112736056A - Flexible chip packaging structure and flexible chip packaging method - Google Patents

Flexible chip packaging structure and flexible chip packaging method Download PDF

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Publication number
CN112736056A
CN112736056A CN201911037343.4A CN201911037343A CN112736056A CN 112736056 A CN112736056 A CN 112736056A CN 201911037343 A CN201911037343 A CN 201911037343A CN 112736056 A CN112736056 A CN 112736056A
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lead
flexible
flexible chip
chip
circuit board
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陈闯
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Zhejiang Heqing Flexible Electronic Technology Co ltd
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Zhejiang Heqing Flexible Electronic Technology Co ltd
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Abstract

The invention discloses a flexible chip packaging structure and a flexible chip packaging method. Specifically, this flexible chip packaging structure includes: a flexible circuit board having a pad thereon; the flexible chip is electrically interconnected with the bonding pad through a lead, wherein when the flexible circuit board is bent, the lead can be stretched and deformed. Therefore, in the flexible chip packaging structure, when the flexible chip and the flexible circuit board are bent greatly, the lead can be stretched and deformed and is not easy to break, and bonding points at the connection part of the lead and the flexible chip and the connection part of the lead and the bonding pad are not easy to be broken, so that the stability and reliability of the flexible chip packaging structure are improved, and the use performance of a product is improved.

Description

Flexible chip packaging structure and flexible chip packaging method
Technical Field
The invention relates to the technical field of chips, in particular to a flexible chip packaging structure and a flexible chip packaging method.
Background
At present, with the improvement of the technical level and the living standard of people, the flexibility, the wearability, the folding and the like of the electronic product become new development requirements, and the flexible electronic product is widely applied to the fields of electronic communication, medical treatment, military and the like. The traditional flexible electronic device adopts the surface mounting technology to mount a traditional hard packaging chip on a flexible circuit board, and a circuit board in a hard packaging chip area is still rigid after surface mounting, so that the advantages of the flexible circuit board cannot be fully reflected, and the flexible requirement of a flexible product cannot be met. At present, with the rapid development of the semiconductor industry, the flexible chip better solves the problem, and the flexible chip has flexibility, so that after the flexible chip is attached to a flexible circuit board, an area for attaching the flexible chip also has flexibility, and the flexibility of a flexible electronic product can be relatively improved.
However, the conventional flexible chip package structure and the flexible chip package method adopt the original rigid chip package technology, and when the flexible electronic product needs to adapt to a larger bending degree, the connection method may cause the problem that the lead bond and the dot off-bond are pulled and broken, or the problem of the bond and the dot off-bond, which further affects the electrical connection and the use experience of the flexible electronic product, so that the package of the flexible chip and the flexible substrate needs to be improved.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the inventor finds that when the flexible chip and the flexible circuit board are electrically interconnected at present, the flexibility of the flexible chip packaging structure after interconnection is poor, leads between the flexible chip and the flexible circuit board are easy to break when the structure is bent (namely, flexible deformation occurs), bonding points between the leads and the flexible chip and between the leads and the flexible circuit board are easy to break, poor device circuit breaking and the like are easy to cause, and the like, so that the use performance of the flexible electronic product is influenced. At present, in the packaging process of a flexible chip, in order to better print and interconnect the flexible chip and a flexible circuit board without affecting electrical properties, a Wire Bonding (WB) process is generally adopted to print and interconnect the flexible chip and the flexible circuit board. In addition, at present, when the flexible chip and the flexible circuit board are printed and interconnected, the existing wire bonding process and equipment for packaging the rigid chip are generally adopted, and when the flexible chip is packaged by the existing wire bonding process for packaging the rigid chip, the process limitation exists. In the existing wire bonding process, the diameter of a lead is thinner, generally 1.25mil, the height of a wire arc of the lead is generally 8-10mil, and in order to save cost and accelerate the process speed, the height of the wire arc is lower, which causes the problems that when the process is applied to a flexible chip, after printing interconnection is completed, when a flexible circuit board is bent and deformed, the lead is bonded and off-bonded or the lead is pulled, dislocated, bent and broken, and the like, can cause irreversible damage to an electronic device, and also reduces the experience effect of people on products.
Therefore, if a new flexible chip package structure and a flexible chip package method can be provided, when the flexible circuit board is bent, the lead connecting the flexible chip and the flexible circuit board can better buffer the deformation and the tensile force generated by bending, the lead is not easy to break, and the bonding points at the connection part of the lead and the flexible chip and the connection part of the lead and the bonding pad are not easy to break off, the stability and the reliability of the flexible chip package structure can be improved to a great extent, the service performance of the flexible chip package structure is improved, and the problems can be solved to a great extent.
In view of the above, in one aspect of the present invention, a flexible chip package structure is provided. According to an embodiment of the present invention, the flexible chip package structure includes: a flexible circuit board having a pad thereon; the flexible chip is electrically interconnected with the bonding pad through a lead, wherein when the flexible circuit board is bent, the lead can be stretched and deformed. From this, when the flexible chip takes place to buckle with flexible circuit board, the lead wire of connecting flexible chip and flexible circuit board among this flexible chip packaging structure can take place tensile deformation, can cushion deformation and the pulling force that buckles the production betterly, and the lead wire is difficult for splitting to, the junction of lead wire and flexible chip, and the bonding point of the junction of lead wire and pad is difficult for taking off the bond fracture, and this flexible chip packaging structure's stability and reliability are higher, and the performance of product is better.
According to an embodiment of the present invention, a length of the lead is greater than a distance between the flexible chip and the pad. From this, when flexible chip and flexible circuit board take place to buckle, tensile deformation can take place when the lead wire of connecting flexible chip and flexible circuit board receives the pulling force, and the lead wire is difficult for splitting to, the junction of lead wire and flexible chip, and the bonding point of the junction of lead wire and the pad on the flexible circuit board is difficult for splitting and takes off the key, can further improve this flexible chip packaging structure's stability and reliability, improves the performance of product.
According to the embodiment of the invention, the lead comprises a first section and a second section which are connected with each other, the included angle between the first section and the second section is not more than 90 degrees, the first section is connected with the flexible chip, the second section is connected with the bonding pad, and the height of the first section is 11-20 mil. Therefore, when the height of the first section of the lead is in the range, the deformation and the pulling force of the flexible chip packaging structure during bending deformation can be well buffered, the lead is not easy to break, and the bonding points at the joint of the lead and the flexible chip and the joint of the lead and the bonding pad on the flexible circuit board are not easy to break and bond, so that the stability and the reliability of the flexible chip packaging structure can be further improved, and the service performance of a product is improved.
According to an embodiment of the present invention, the lead is an "S" shaped structure; or, the lead is in a spring-shaped structure; or the lead is in a continuous zigzag structure. From this, when the lead wire is "S" shape structure, spring shape structure or continuous zigzag structure, can further increase the overall length of lead wire, when this flexible chip packaging structure takes place bending deformation, the lead wire of connecting flexible chip and flexible circuit board can buffer deformation volume and pulling force when this flexible chip packaging structure takes place bending deformation betterly, the lead wire is difficult for splitting, the bonding point of the lead wire of connecting flexible chip and flexible circuit board also is difficult for taking off the bond fracture at the junction, can further improve flexible chip packaging structure' S stability and reliability, improve the performance of product.
According to an embodiment of the present invention, the flexible chip package structure further includes: and the reinforcing structures are arranged at the connection part of the lead and the flexible chip and the connection part of the lead and the bonding pad. Therefore, the reinforcing structure can better fix the joint of the lead and the flexible chip and the joint of the lead and the bonding pad, when the flexible chip packaging structure is bent, the bonding point of the lead connecting the flexible chip and the flexible circuit board at the joint is not easy to be broken, the stability and reliability of the flexible chip packaging structure can be further improved, and the use performance of a product is improved.
In particular, the material forming the reinforcing structure comprises a reinforcing glue. Therefore, the reinforcing glue can better fix the joint of the lead and the flexible chip and the joint of the lead and the bonding pad, when the flexible chip and the flexible circuit board are bent, the bonding point of the lead connecting the flexible chip and the flexible circuit board at the joint is not easy to be broken, the stability and reliability of the flexible chip packaging structure can be further improved, and the use performance of a product is improved.
In another aspect of the present invention, the present invention provides a method for packaging a flexible chip. According to an embodiment of the invention, the method comprises: providing a flexible circuit board, wherein the flexible circuit board is provided with a welding disc; providing a flexible chip; and electrically interconnecting the flexible chip and the bonding pad by using a lead, wherein when the flexible circuit board is bent, the lead can be subjected to tensile deformation. Therefore, the flexible chip packaging structure can be formed after the flexible chip and the flexible circuit board are electrically interconnected, when the flexible chip packaging structure is bent, the lead wire for connecting the flexible chip and the flexible circuit board can be subjected to tensile deformation, deformation and tensile force generated by bending can be well buffered, the lead wire is not easy to break, and the lead wire is not easy to break off the bond at the bonding point of the connection part of the lead wire, the flexible chip packaging structure and the flexible circuit board, so that the stability and reliability of the prepared flexible chip packaging structure can be improved, and the service performance of a product can be improved.
According to an embodiment of the present invention, a length of the lead is greater than a distance between the flexible chip and the pad. From this, when flexible chip and flexible circuit board take place to buckle, tensile deformation can take place when the lead wire of connecting flexible chip and flexible circuit board receives the pulling force, and the lead wire is difficult for splitting to, the junction of lead wire and flexible chip, and the bonding point of the junction of lead wire and the pad on the flexible circuit board is difficult for splitting and takes off the key, can further improve flexible chip packaging structure's stability and reliability, improves the performance of product.
According to an embodiment of the present invention, the electrically interconnecting the flexible chip and the pad with a wire includes: and routing between the flexible chip and the bonding pad by using routing equipment, and forming the lead electrically interconnected with the flexible chip and the bonding pad in one step. Therefore, the lead can be simply and conveniently manufactured by using the conventional routing equipment, the flexible chip and the flexible circuit board are electrically interconnected through the lead, the production efficiency of the flexible chip packaging structure is improved, the stability and the reliability of the flexible chip packaging structure can be further improved, and the use performance of a product is improved.
According to an embodiment of the present invention, the electrically interconnecting the flexible chip and the pad with a wire includes: manufacturing the lead wire in advance; and respectively welding two ends of the lead with the flexible chip and the bonding pad. Therefore, the lead can be simply manufactured, the shape and the like of the lead are not particularly limited, the flexible chip and the bonding pad on the flexible circuit board can be connected in a welding mode through the lead, electrical interconnection is achieved, the stability and the reliability of the flexible chip packaging structure can be further improved, and the using performance of products is improved.
According to an embodiment of the present invention, the packaging method of the flexible chip further includes: and dispensing and fixing the joint of the lead and the flexible chip and the joint of the lead and the bonding pad. Therefore, the connection part of the lead and the flexible chip and the connection part of the lead and the bonding pad can be well fixed, when the flexible chip and the flexible circuit board are bent, the lead connecting the flexible chip and the flexible circuit board is not easy to be off-bonded at the connection part, the stability and the reliability of the flexible chip packaging structure can be further improved, and the use performance of a product is improved.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a flexible chip package structure according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a flexible chip package structure in the prior art;
FIG. 3 is a schematic structural diagram of a flexible chip package structure according to another embodiment of the invention;
FIG. 4 is a schematic structural diagram of a flexible chip package structure according to yet another embodiment of the invention;
FIG. 5 is a schematic structural diagram of a flexible chip package structure according to yet another embodiment of the invention;
FIG. 6 is a schematic structural diagram of a flexible chip package structure according to yet another embodiment of the invention;
FIG. 7 is a schematic structural diagram of a flexible chip package structure according to yet another embodiment of the invention;
FIG. 8 shows a flow diagram of a method of packaging a flexible chip in accordance with yet another embodiment of the invention; and
fig. 9 shows a flow chart of a method for packaging a flexible chip according to yet another embodiment of the invention.
Description of reference numerals:
1000: a flexible chip package structure; 100: a flexible circuit board; 110: a pad; 120: a flexible chip; 130: a lead wire; 140: and (5) reinforcing the structure.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the invention, a flexible chip package structure is provided. According to an embodiment of the present invention, referring to fig. 1, the flexible chip package structure 1000 may include: the flexible printed circuit board comprises a flexible printed circuit board 100 and a flexible chip 120, wherein the flexible printed circuit board 100 is provided with a bonding pad 110, and the flexible chip 120 is electrically interconnected with the bonding pad 110 through a lead 130, wherein when the flexible printed circuit board 100 is bent, the lead 130 can be stretched and deformed. Therefore, in the flexible chip package structure 1000, when the flexible chip 120 and the flexible circuit board 100 are bent, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 can be subjected to tensile deformation, so that deformation and tensile force generated by bending can be well buffered, the lead 130 is not easy to break, moreover, bonding points at the connection part of the lead 130 and the flexible chip 120 and the connection part of the lead 130 and the bonding pad 110 are not easy to be broken, the stability and reliability of the flexible chip package structure 1000 are high, and the service performance of a product is good.
For convenience of understanding, the following is a brief description of the principle by which the flexible chip package structure 1000 according to the embodiment of the present invention can obtain the above-mentioned advantageous effects:
as mentioned above, referring to fig. 2, when the flexible chip and the flexible circuit board are electrically interconnected by using the wire bonding process and the apparatus for packaging the rigid chip to form the flexible chip package structure, the wire loop height h of the lead 130 is typically 8-10 mils, the diameter of the lead 130 is typically 1.25 mils, and when the flexible circuit board 100 is bent, the lead 130 will be stressed and stretched. The stress range of the point a at the connection between the lead 130 and the flexible chip 120 and the point B at the connection between the lead 130 and the bonding pad 110 on the flexible circuit board 100 is generally 3-5 g; the force range at point C represents the force range of the lead 130, typically 10-15 g. When the bending radian of the flexible circuit board 100 is increased to a certain degree, the stress of the point a and the point B exceeds the stress range, which may cause the bond point of the point a and the point B to break and release the bond, and when the stress of the lead 130 exceeds the stress range, the lead 130 may also break, which may cause the electrical property of the flexible chip product to change, and the function of the product to fail. According to the flexible chip package structure 1000 of the embodiment of the invention, because the lead 130 can be subjected to tensile deformation, when the flexible chip 120 and the flexible circuit board 100 are bent, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 can be subjected to tensile deformation when being subjected to tensile force, deformation and tensile force generated by bending can be better buffered, the lead 130 is not easy to break, in addition, the lead 130 can also reduce the stress of a point a at the connection position of the lead 130 and the flexible chip 120 and a point B at the connection position of the lead 130 and the bonding pad 110 on the flexible circuit board 100, and a bonding point between the point a and the point B is not easy to break and be debonded, so that the flexible chip package structure 1000 has high stability and reliability, and the product has good service performance. It should be noted that the length in mils is equal to 0.0254 mm.
According to an embodiment of the present invention, the length of the lead 130 may be greater than the distance between the flexible chip 120 and the pad 110 (i.e., the length of the lead 130 is greater than the distance between the point a where the lead 130 is connected to the flexible chip 120 and the point B where the lead 130 is connected to the pad 110). Specifically, the length of the leads 130 may be greater than the length of the leads in prior art methods (i.e., methods of packaging flexible chips using a wire bonding process for packaging rigid chips). Therefore, when the flexible chip 120 is bent on the flexible circuit board 100, the lead 130 can be subjected to more tensile deformation when being subjected to tensile force, deformation and tensile force generated by bending can be buffered better, the lead 130 is not easy to break, in addition, the lead 130 can also lighten the A point at the connection part of the lead 130 and the flexible chip 120 and the stress magnitude of the B point at the connection part of the lead 130 and the bonding pad 110 on the flexible circuit board 100, the bonding point of the A point and the B point is not easy to break and bond, the stability and reliability of the flexible chip packaging structure 1000 can be further improved, and the service performance of a product is improved.
According to the embodiment of the present invention, the specific structure of the lead 130 is not particularly limited as long as the lead 130 can be subjected to tensile deformation when the flexible chip packaging structure 1000 is subjected to bending deformation. Specifically, referring to fig. 3, the lead 130 may include a first segment 130a and a second segment 130b connected to each other, the first segment 130a and the second segment 130b may form an included angle of not more than 90 degrees, the first segment 130a may be connected to the flexible chip 120, and the second segment 130b may be connected to the pad 110, wherein the height H of the first segment 130a may be 11-20 mils, such as 12 mils, 13 mils, 14 mils, 15 mils, 16 mils, 17 mils, 18 mils, 19 mils, and the like. Therefore, when the height of the first segment 130a of the lead 130 is in the above range, compared with the common height of the lead in the prior art (for example, when the flexible chip is packaged by using a wire bonding process in the prior art, the height of the first segment of the lead is usually 8-10mil), the overall length of the lead 130 in the present application is longer than that of the lead in the prior art, so that the bending resistance of the lead 130 can be better improved, that is, when the flexible chip 120 and the flexible circuit board 100 are bent greatly, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 can be deformed by tension, the deformation and tension generated by bending can be better buffered, the lead 130 is not easy to break, and the bonding point at the connection of the lead 130 and the flexible chip 120 and the connection of the lead 130 and the pad 110 on the flexible circuit board 100 is not easy to break and debond, the stability and reliability of the flexible chip packaging structure 1000 can be further improved, and the service performance of the product can be improved. It should be noted that, the aforementioned "angle between the first segment 130a and the second segment 130 b" may refer to the angle a shown in fig. 3, since the first segment 130a and the second segment 130b are generally in circular arc transition connection, that is, the first segment 130a and the second segment 130b may each include a straight line portion and a circular arc portion, and the angle between the first segment 130a and the second segment 130b, that is, the angle between the straight line portion of the first segment 130 and the extension line of the straight line portion of the second segment 130b, refers to the angle a shown in fig. 3.
According to some embodiments of the present invention, referring to fig. 4-6, the lead 130 may be an "S" shaped structure (shown with reference to fig. 4), or the lead 130 may be a spring shaped structure (shown with reference to fig. 5), or the lead 130 may also be a continuous dogleg shaped structure (shown with reference to fig. 6). Therefore, when the lead 130 is an S-shaped structure, a spring-shaped structure or a continuous zigzag structure, the overall length of the lead 130 can be further increased, and the bending resistance of the lead 130 can be further improved, when the flexible chip 120 and the flexible circuit board 100 are bent, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 can be subjected to tensile deformation, so that the deformation and the tensile force generated by bending can be better buffered, the lead 130 is not easy to break, and the bonding points at the connection part of the lead 130 and the flexible chip 120 and the connection part of the lead 130 and the bonding pad 110 on the flexible circuit board 100 are not easy to break and debond, so that the stability and the reliability of the flexible chip packaging structure 1000 can be further improved, and the service performance of the product can be improved.
Specifically, the lead 130 may be made of a material with good ductility, for example, a material such as metal gold, metal aluminum, metal copper, and metal silver alloy, and the lead 130 made of metal gold has good chemical corrosion resistance and discoloration resistance, is not easy to corrode and oxidize, has good thermal conductivity and electrical conductivity, and is beneficial to improving the electrical performance and heat dissipation performance of the circuit; the lead 130 formed of aluminum metal has a lower cost and aluminum has better ductility, conductivity and thermal conductivity. Therefore, when the lead 130 is formed by the above materials, the stability and reliability of the flexible chip packaging structure 1000 can be further improved, the use performance of the product can be improved, and the overall flexibility of the product can be favorably realized.
According to an embodiment of the present invention, referring to fig. 7, the flexible chip package structure 1000 may further include a reinforcing structure 140, where the reinforcing structure 140 is disposed at the connection of the lead 130 and the flexible chip 120, and at the connection of the lead 130 and the pad 110. Therefore, when the reinforcing structure 140 is disposed at the connection between the lead 130 and the flexible chip 120 and the connection between the lead 130 and the pad 110, the connection between the lead 130 and the flexible chip 120 and the connection between the lead 130 and the pad 110 can be better fixed, and when the flexible chip 120 and the flexible circuit board 100 are bent greatly, the bonding point at the connection between the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 is further not prone to bond and break, so that the stability and reliability of the flexible chip package structure 1000 can be further improved, and the usability of the product can be improved.
Specifically, the material forming the reinforcing structure 140 is not particularly limited, and may be, for example, a reinforcing glue. Therefore, the reinforcing glue can better fix the joint of the lead 130 and the flexible chip 120 and the joint of the lead 130 and the bonding pad 110, when the flexible chip 120 and the flexible circuit board 100 are bent, the bonding point of the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 at the joint is not easy to be off-bond and broken, the stability and reliability of the flexible chip packaging structure 1000 can be further improved, and the use performance of the product is improved.
As can be seen from the above, according to the flexible chip package structure 1000 in the embodiment of the present invention, when the flexible chip 120 and the flexible circuit board 100 are bent, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 may be subjected to tensile deformation, so as to better buffer the deformation and the tensile force generated by the bending, the lead 130 is not easily broken, and the bond points at the connection between the lead 130 and the flexible chip 120 and the connection between the lead 130 and the pad 110 are not easily broken by bonding, so that the flexible chip 120 can still normally operate, and the flexible chip package structure 1000 has high stability and reliability, and better product usability.
In another aspect of the invention, the invention provides a packaging method of a flexible chip. According to an embodiment of the present invention, the flexible chip package structure prepared by packaging the flexible chip by the method may be the flexible chip package structure described above, and therefore, the flexible chip package structure prepared by packaging the flexible chip by the method may have all the features and advantages of the flexible chip package structure described above, and details are not described herein. According to the method, the flexible chip and the flexible circuit board are electrically interconnected to form the flexible chip packaging structure, when the flexible chip packaging structure is bent, the lead wire for connecting the flexible chip and the flexible circuit board can be subjected to tensile deformation, the deformation and the tensile force generated by bending can be well buffered, the lead wire is not easy to break, the bonding points at the joint of the lead wire and the flexible chip and the joint of the lead wire and the bonding pad are not easy to break due to bond separation, the stability and the reliability of the prepared flexible chip packaging structure can be improved, and the service performance of a product is improved.
Referring to fig. 8, the method includes, according to an embodiment of the present invention:
s110: providing a flexible circuit board 100, wherein the flexible circuit board 100 is provided with a welding pad 110
In this step, a flexible circuit board 100 is provided, the flexible circuit board 100 having a pad 110 thereon. According to the embodiment of the present invention, the specific shape, size, etc. of the flexible circuit board 100 are not particularly limited, and the flexible circuit board 100 has pads, and the plurality of flexible chips 120 may be electrically connected to the terminals on the pads 110, respectively.
S120: providing a flexible chip 120
In this step, a flexible chip 120 is provided. According to an embodiment of the present invention, the specific type of the flexible chip 120 is not particularly limited, for example, the substrate of the flexible chip 120 may be formed of a flexible material, the flexible chip 120 itself has flexibility, a large degree of bending may occur, and the like.
S130: the flexible chip 120 and the bonding pad 110 are electrically connected by the lead 130, and the lead 130 can be stretched and deformed when the flexible circuit board 100 is bent
In this step, the flexible chip 120 and the bonding pad 110 are electrically interconnected by the lead 130, wherein the lead 130 may be deformed by stretching when the flexible circuit board 100 is bent. Therefore, when the flexible chip 120 and the flexible circuit board 100 are bent, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 can be subjected to tensile deformation, deformation and tensile force generated by bending can be buffered well, the lead 130 is not easy to break, the lead 130 can relieve the joint of the lead 130 and the flexible chip 120 and the tensile force applied to the joint of the lead 130 and the bonding pad 110 on the flexible circuit board 100, bonding points are not easy to break and release bonds, the stability and reliability of the prepared flexible chip packaging structure can be further improved, and the use performance of products is improved.
According to an embodiment of the present invention, the length of the lead 130 may be greater than the distance between the flexible chip 120 and the pad 110. Therefore, when the flexible chip 120 and the flexible circuit board 100 are bent, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 can be subjected to tensile deformation, deformation and tensile force generated by bending can be well buffered, the lead 130 is not easy to break, furthermore, the joint of the lead 130 and the flexible chip 120 and the bonding point of the joint of the lead 130 and the bonding pad 110 on the flexible circuit board 100 are not easy to break and bond, the stability and reliability of the prepared flexible chip packaging structure can be further improved, and the service performance of a product is improved.
Specifically, the lead 130 may be made of a material having a relatively good ductility, for example, a metal such as gold, aluminum, or the like. Therefore, when the lead 130 is formed by the materials, the stability and the reliability of the prepared flexible chip packaging structure can be further improved, the service performance of the product can be improved, and the comprehensive flexibility of the product can be favorably realized.
According to some embodiments of the present invention, electrically interconnecting the flexible chip 120 and the pad 110 using the wire 130 may include: the wire bonding device is used to wire between the flexible chip 120 and the bonding pad 110, and the wire 130 electrically interconnected with the flexible chip 120 and the bonding pad 110 is formed in one step. Therefore, the lead 130 can be simply manufactured by using the existing routing equipment, the manufactured lead 130 is longer, the flexible chip 120 and the flexible circuit board 100 are electrically interconnected through the lead 130, the production efficiency is improved, and the stability and the reliability of the manufactured flexible chip packaging structure can be further improved.
Specifically, the lead 130 printed by the above one-shot forming method may include a first segment 130a and a second segment 130b, an included angle between the first segment 130a and the second segment 130b may be not greater than 90 degrees, the first segment 130a is connected to the flexible chip 120, and the second segment 130b is connected to the pad 110, wherein the height of the first segment 130a may be 11-20 mils. Therefore, when the height of the first section 130a of the lead 130 is in the above range, the total length of the lead 130 is longer than that of a lead with a general height of 8-10mil in the prior art, which can better improve the bending resistance of the lead 130, when the flexible chip 120 and the flexible circuit board 100 are bent, the lead 130 connecting the flexible chip 120 and the flexible circuit board 100 can be better buffered and stretched when being subjected to a pulling force, the lead 130 is not easy to break, and the bonding points at the connection position of the lead 130 and the flexible chip 120 and at the connection position of the lead 130 and the bonding pad 110 are not easy to be broken, so that the flexible chip 120 can still work normally, thereby further improving the stability and reliability of the flexible chip packaging structure and improving the usability of the product.
Specifically, the lead 130 printed by the above-described one-shot forming method may be a continuous zigzag structure. From this, can further increase the overall length of lead 130, further improve the resistant performance of buckling of lead 130, when great the buckling takes place for flexible chip 120 and flexible circuit board 100, tensile deformation can take place when connecting lead 130 of flexible chip 120 and flexible circuit board 100 and receiving the pulling force, deformation and the pulling force that receive the production of buckling can be better cushioned, lead 130 is difficult for splitting, and, the junction of lead 130 and flexible chip 120, and the bonding point of the junction of lead 130 and pad 110 is difficult for breaking off the bond, can further improve the stability and the reliability of flexible chip packaging structure, improve the performance of product.
According to other embodiments of the present invention, electrically interconnecting the flexible chip 120 and the pad 110 by the wire 130 may further include: manufacturing a lead 130 in advance; both ends of the lead 130 are soldered to the flexible chip 120 and the pad 110, respectively. Thus, the lead 130 can be easily manufactured, and the structure of the lead 130 that can be manufactured is not particularly limited, for example, the lead 130 may have an "S" type structure, or the lead 130 may have a spring type structure, or the like; in addition, the two ends of the lead 130 are respectively soldered to the flexible chip 120 and the pad 110, so that the flexible chip 120 and the flexible circuit board 100 can be electrically interconnected easily.
Specifically, when the flexible chip package structure is fabricated by the method of fabricating the lead 130 first and then welding the two ends of the lead 130 with the flexible chip 120 and the bonding pad 110, the lead 130 may have an "S" shape, or the lead 130 may have a spring shape. Therefore, when the lead 130 is prefabricated into an S-shaped structure or a spring-shaped structure, after the lead is welded with the flexible chip and the bonding pad on the flexible circuit board, the overall length of the lead can be further increased, and the bending resistance of the lead 130 can be further improved.
According to an embodiment of the present invention, referring to fig. 9, the packaging method of the flexible chip may further include:
s140: the connection position of the lead 130 and the flexible chip 120 and the connection position of the lead 130 and the bonding pad 110 are fixed by dispensing
In this step, the joints of the leads 130 and the flexible chip 120 and the joints of the leads 130 and the bonding pads 110 are fixed by dispensing. According to the embodiment of the present invention, the connection point of the lead 130 and the flexible chip 120 and the connection point of the lead 130 and the pad 110 may be fixed by using a reinforced glue, for example, a regular glue such as 302, 501, 502, 101, or an epoxy glue. Therefore, the stress range of the connection position of the lead 130 and the flexible chip 120 and the connection position of the lead 130 and the bonding pad 110 can be increased, the bonding strength of the lead 130, the flexible chip 120 and the flexible circuit board 100 is improved, when the flexible chip 120 and the flexible circuit board 100 are bent, the connection position of the lead 130 and the flexible chip 120 and the connection position of the lead 130 and the bonding pad 110 on the flexible circuit board 100 are not easy to break, the stability and reliability of the prepared flexible chip packaging structure can be further improved, and the service performance of a product is improved.
In the description of the present specification, the terms "upper" and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (11)

1. A flexible chip package structure, comprising:
a flexible circuit board having a pad thereon;
a flexible chip electrically interconnected with the bonding pads by leads, wherein,
when the flexible circuit board is bent, the lead can be stretched and deformed.
2. The flexible chip package structure of claim 1, wherein the leads have a length greater than a distance between the flexible chip and the pads.
3. The FCIP of claim 1, wherein the lead comprises a first segment and a second segment connected to each other, wherein an included angle between the first segment and the second segment is not greater than 90 degrees, the first segment is connected to the FCIP, the second segment is connected to the bonding pad, and wherein the first segment has a height of 11-20 mils.
4. The flexible chip package structure of claim 1,
the lead is of an S-shaped structure;
or, the lead is in a spring-shaped structure;
or the lead is in a continuous zigzag structure.
5. The flexible chip package structure according to claim 1, further comprising:
and the reinforcing structure is arranged at the joint of the lead and the flexible chip and/or the joint of the lead and the bonding pad.
6. The flexible chip package structure of claim 5, wherein the material forming the stiffener structure comprises a stiffener glue.
7. A packaging method of a flexible chip is characterized by comprising the following steps:
providing a flexible circuit board, wherein the flexible circuit board is provided with a welding disc;
providing a flexible chip;
and electrically interconnecting the flexible chip and the bonding pad by using a lead, wherein when the flexible circuit board is bent, the lead can be subjected to tensile deformation.
8. The packaging method of claim 7, wherein the leads have a length greater than a distance between the flex chip and the pads.
9. The method of packaging of claim 7, wherein the electrically interconnecting the flex chip and the bond pad with leads comprises:
and routing between the flexible chip and the bonding pad by using routing equipment, and forming the lead electrically interconnected with the flexible chip and the bonding pad in one step.
10. The method of packaging of claim 7, wherein the electrically interconnecting the flex chip and the bond pad with leads comprises:
manufacturing the lead wire in advance;
and respectively welding two ends of the lead with the flexible chip and the bonding pad.
11. The method of packaging of claim 7, further comprising:
and dispensing and fixing the joint of the lead and the flexible chip and the joint of the lead and the bonding pad.
CN201911037343.4A 2019-10-29 2019-10-29 Flexible chip packaging structure and flexible chip packaging method Pending CN112736056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911037343.4A CN112736056A (en) 2019-10-29 2019-10-29 Flexible chip packaging structure and flexible chip packaging method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911037343.4A CN112736056A (en) 2019-10-29 2019-10-29 Flexible chip packaging structure and flexible chip packaging method

Publications (1)

Publication Number Publication Date
CN112736056A true CN112736056A (en) 2021-04-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
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