CN109037998B - Electric connection assembly, display device and electric connection method - Google Patents

Electric connection assembly, display device and electric connection method Download PDF

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Publication number
CN109037998B
CN109037998B CN201810896462.4A CN201810896462A CN109037998B CN 109037998 B CN109037998 B CN 109037998B CN 201810896462 A CN201810896462 A CN 201810896462A CN 109037998 B CN109037998 B CN 109037998B
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conductive
adjacent
walls
conductive walls
terminal
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CN109037998A (en
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秦学思
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/04—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation using electrically conductive adhesives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Wire Bonding (AREA)
  • Liquid Crystal (AREA)

Abstract

The application discloses an electric connection assembly, a display device and an electric connection method. The first terminal includes a plurality of first electrically conductive walls, and the second terminal includes two at least electrically conductive walls of second, and when first terminal and second terminal were pegged graft, first electrically conductive wall and the electrically conductive wall of second set up along the horizontal direction interval, all are equipped with the cracked conductive particle of deformation of insulating polymer layer and pass through between two adjacent first electrically conductive walls and the electrically conductive wall of second and realize the electricity connection. Therefore, the method and the device can be beneficial to improving the yield of the Bonding process.

Description

Electric connection assembly, display device and electric connection method
Technical Field
The application relates to the technical field of electronic equipment, in particular to an electric connection assembly, a display device and an electric connection method.
Background
Currently, in order to meet the trend of light and thin display devices and narrow frame designs, COF (Chip on Film) technology has gradually become a mainstream. The COF technology is a packaging technology for fixing a driver IC on a flexible circuit board, and pins of the COF technology are electrically connected to Bonding pads (Bonding pads) of a display panel through an Anisotropic Conductive Film (ACF).
Referring to fig. 1 and 2, in a Bonding process of a display device based on COF technology, a conductive paste 13 containing conductive particles 131 is first coated on a display panel 11, and then the display panel 11 and a COF 12 are pressed against each other, for example, the COF 12 is pressed toward the display panel 11, wherein a plurality of Bonding pads 111 are disposed on the display panel 11, a plurality of leads 121 are disposed on the COF 12, the conductive particles 131 between the Bonding pads 111 and the leads 121 are pressed and deformed, and an insulating polymer layer wrapping the surfaces of the conductive particles 131 is broken, so that the Bonding pads 111 and the leads 121 are electrically connected through the conductive particles 131, thereby achieving electrical connection between the display panel 11 and the COF 12.
However, the distribution of the conductive particles 131 in the conductive paste 13 is not uniform, which easily causes some Bonding pads 111 and leads 121 to have the conductive particles 131 pressed therebetween, and some Bonding pads 111 and leads 121 to have no conductive particles 131 therebetween, as shown by the area defined by the dotted line in fig. 1. In addition, the deformation amount of the conductive particles 131 is difficult to control, and the implementation of the directional conduction is difficult, as shown in the area defined by the dotted line in fig. 2, the plurality of conductive particles 131 located between the Bonding Pad 111 and the lead 121 are easy to make lateral contact, and lateral conduction is easy to occur, which causes electrical connection between two adjacent Bonding pads 111 (or two adjacent leads 121) to cause a short circuit. As can be seen, the yield of the current Bonding process is low.
Disclosure of Invention
In view of this, the present application provides an electrical connection assembly, a display device, and an electrical connection method, which can facilitate increasing the yield of the Bonding process.
An electrical connection assembly of an embodiment of the present application includes:
the conductive adhesive comprises conductive particles coated with an insulating polymer layer;
the first terminal comprises a plurality of first conductive walls which are arranged at intervals, and the distance between every two adjacent first conductive walls is smaller than the diameter of the conductive particles;
the second terminal comprises at least two second conductive walls which are arranged at intervals;
when the first terminal and the second terminal are connected in an inserting mode, the conductive adhesive is filled between the first terminal and the second terminal, the first conductive walls and the second conductive walls are arranged at intervals in the direction perpendicular to the first conductive walls, the distance between every two adjacent first conductive walls and the distance between every two adjacent second conductive walls are smaller than the diameter of the conductive particles, and the conductive particles with cracked insulating polymer layers are arranged between every two adjacent first conductive walls and between every two adjacent second conductive walls and are electrically connected through the conductive particles.
The display device of an embodiment of the application comprises the electrical connection assembly.
The electrical connection method of an embodiment of the present application includes:
providing a first connecting piece with a first terminal and a second connecting piece with a second terminal, wherein the first terminal comprises a plurality of first conductive walls arranged at intervals, and the second terminal comprises at least two second conductive walls arranged at intervals;
forming a conductive adhesive on the second connecting piece, wherein the conductive adhesive is filled between two adjacent second conductive walls and comprises conductive particles with insulating polymer layers wrapped on the surfaces, and the diameter of each conductive particle is larger than the distance between two adjacent first conductive walls;
and oppositely pressing the first connecting piece and the second connecting piece, wherein the first conductive walls and the second conductive walls are arranged at intervals along a direction perpendicular to the first conductive walls, and the distance between every two adjacent first conductive walls and the distance between every two adjacent second conductive walls are smaller than the diameter of the conductive particles, so that the insulating polymer layers of the conductive particles between every two adjacent first conductive walls and between every two adjacent second conductive walls are broken and are electrically connected through the conductive particles.
Has the advantages that: one of the terminals for realizing the electric connection comprises a plurality of first conductive walls arranged at intervals, the other terminal comprises at least two second conductive walls arranged at intervals, when the two terminals are inserted and filled with conductive adhesive, the first conductive walls and the second conductive walls are arranged at intervals, the distance between every two adjacent first conductive walls and the distance between every two adjacent second conductive walls are smaller than the diameter of the conductive particles, the conductive particles deform due to transverse extrusion between every two adjacent first conductive walls and the second conductive walls, the insulating polymer layer wrapping the outer portions of the conductive particles breaks, the electric connection between every two adjacent first conductive walls and the second conductive walls is realized through the conductive particles, and the two terminals realize the electric connection only through the conductive particles which are positioned between the adjacent conductive walls and deform, therefore, directional conduction (namely, transverse conduction) can be achieved, and even if the conductive particles are not uniformly distributed in the conductive adhesive, so that the conductive particles are not arranged between some adjacent first conductive walls and second conductive walls and between some adjacent two first conductive walls, the first terminals and the second terminals can still be electrically connected through other conductive particles positioned between the adjacent first conductive walls and second conductive walls, so that the yield of the Bonding process is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment of a display device using a conventional Bonding process;
FIG. 2 is a schematic cross-sectional view of another embodiment of a display device using a conventional Bonding process;
FIG. 3 is a schematic structural diagram of an electrical connection assembly according to an embodiment of the present application;
fig. 4 is a schematic structural view of the first terminal shown in fig. 3;
FIG. 5 is a schematic cross-sectional view of the first terminal shown in FIG. 4 taken along the A-A direction;
FIG. 6 is a schematic side view of the structure of the second terminal shown in FIG. 3;
FIG. 7 is a schematic cross-sectional view of the second terminal shown in FIG. 6 taken along the direction B-B;
FIG. 8 is a schematic flow chart diagram of an electrical connection method according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a scenario for implementing electrical connection of electrical connection components based on the method shown in FIG. 8;
FIG. 10 is a cross-sectional view of an embodiment of an end of a first terminal of the present application;
FIG. 11 is a cross-sectional view of another embodiment of an end of a first terminal of the present application;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
The technical solutions of the various exemplary embodiments provided in the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application. The various embodiments described below and the features of the embodiments can be combined with each other without conflict. Furthermore, directional terms such as "upper" and "lower" are used throughout the present application to better describe the technical solutions of the embodiments, and are not used to limit the protection scope of the present application.
Fig. 3 is a schematic structural diagram of an electrical connection assembly according to an embodiment of the present application. As shown in fig. 3 to 6, the electrical connection assembly 30 includes a first terminal 31, a second terminal 32, and a conductive adhesive 33. The plurality of first terminals 31 may be disposed on the first connection member 34 at intervals in the horizontal direction, and the plurality of second terminals 32 may be disposed on the second connection member 35 at intervals in the horizontal direction. The first terminal 31 and the second terminal 32 are conductive elements, and are plugged in one-to-one correspondence to realize electrical connection. The conductive paste 33 may include an epoxy paste 331 and conductive particles 332 distributed in the epoxy paste 331, wherein the surfaces of the conductive particles 332 are wrapped by an insulating polymer layer.
Referring to fig. 4 and fig. 5, the first terminal 31 includes a plurality of first conductive walls 311 arranged at intervals, only four of which are shown for illustration, wherein the distance between two adjacent first conductive walls 311 may be equal or unequal, but the distance between any two adjacent first conductive walls 311 is smaller than the diameter of the conductive particles 332. As shown by the dashed areas in fig. 6 and 7, the second terminal 32 includes two second conductive walls 321 arranged at intervals.
The first conductive wall 311 and the second conductive wall 321 may be made of the same conductive material, and may be made of the same material as that of the conventional Bonding Pad, for example, a single metal such as copper, iron, and titanium, or an alloy formed by a plurality of conductive metals according to a predetermined ratio may be used. In addition, at least one of the first conductive wall 311 and the second conductive wall 321 may have a single-layer structure, or may be a composite layer formed by sequentially stacking multiple layers of conductive materials.
The principle and process of the first terminal 31 and the second terminal 32 to realize the plugging will be described with reference to fig. 8 and 9. As shown in fig. 8, the electrical connection method of the present application includes:
s81: providing a first connecting piece with a first terminal and a second connecting piece with a second terminal, wherein the first terminal comprises a plurality of first conductive walls arranged at intervals, and the second terminal comprises at least two second conductive walls arranged at intervals.
S82: and forming conductive adhesive on the second connecting piece, wherein the conductive adhesive is filled between two adjacent second conductive walls and comprises conductive particles with insulating polymer layers wrapped on the surfaces, and the diameters of the conductive particles are larger than the distance between two adjacent first conductive walls.
As shown in fig. 9, the present application can apply the conductive paste 33 onto the second connecting member 35 by pressing a plate 90, and then remove the plate 90.
S83: the first connecting piece and the second connecting piece are oppositely pressed, the first conductive walls and the second conductive walls are arranged at intervals in the direction perpendicular to the first conductive walls, and the distance between every two adjacent first conductive walls and the distance between every two adjacent second conductive walls are smaller than the diameter of the conductive particles, so that the insulating polymer layers of the conductive particles between every two adjacent first conductive walls and between every two adjacent second conductive walls are broken and are electrically connected through the conductive particles.
Referring to fig. 3 and 9, taking the insertion state of one first terminal 31 and one corresponding second terminal 32 as an example, the conductive adhesive 33 is filled between the first terminal 31 and the second terminal 32, all the first conductive walls 311 of the first terminal 31 are located between two second conductive walls 321, and the first conductive walls 311 and the second conductive walls 321 are spaced apart along a horizontal direction (i.e., a direction perpendicular to the first conductive walls 311 or the second conductive walls 321). Since the distance between the first conductive wall 311 and the second conductive wall 321 adjacent to the first conductive wall 311 is smaller than the diameter of the conductive particle 332, and the distance between two adjacent first conductive walls 311 is also smaller than the diameter of the conductive particle 332, the conductive particle 332 is deformed by being transversely pressed between the adjacent first conductive wall 311 and the second conductive wall 321, and between two adjacent first conductive walls 311, the insulating polymer layer wrapped outside the conductive particle 332 is broken due to friction with the conductive walls during pressing and plugging, and the electrical connection between the adjacent first conductive wall 311 and the second conductive wall 321, and between two adjacent first conductive walls 311 is realized through the conductive particle 332.
In the present application, only the deformed conductive particles 332 located between the adjacent conductive walls (including the two adjacent first conductive walls 311, and the first conductive wall 311 and the second conductive wall 321 adjacent thereto) can be used to realize the first terminals 31 and the second terminals 32, that is, the present application can realize directional conduction, and since the distance between the two adjacent first terminals 31 and the distance between the two adjacent second terminals 32 are both greater than the diameter of the conductive particles 332, the conductive particles 332 located between the two adjacent first terminals 31 and between the two adjacent second terminals 32 are not deformed, the insulating polymer layer wrapped on the surface thereof is not cracked, and the electrical connection between the two adjacent first terminals 31 and between the two adjacent second terminals 32 cannot be realized.
Moreover, even if the conductive particles 332 are unevenly distributed in the conductive adhesive 33, so that the conductive particles 332 are not disposed between some adjacent first conductive walls 311 and second conductive walls 321, and between some adjacent two first conductive walls 311, the first terminals 31 and the second terminals 32 can still be electrically connected through the conductive particles 332 disposed between other adjacent first conductive walls 311 and second conductive walls 321, thereby facilitating the improvement of the yield of the Bonding process.
On this basis, the present application may further provide that each second terminal 32 includes more than two second conductive walls 321, and the second conductive walls 321 and the plurality of first conductive walls 311 of one first terminal 31 are alternately arranged along the horizontal direction, so as to achieve the aforementioned electrical connection.
In order to reduce the resistance to the conductive particles 332 during the insertion of the first and second terminals 31 and 32, the present application may provide that the radial dimension of at least one of the end portions of the first and second conductive walls 311 and 321 is smaller than the radial dimension of the main body portion. Taking the first conductive wall 311 as an example, that is, the end of the first conductive wall 311 facing the second terminal 32 is tapered and the main body thereof is thicker, during the plugging process, the conductive particles 332 can move from the end of the first conductive wall 311 to both sides of the first conductive wall 311 relatively easily. To achieve this, the cross section of the end of the first conductive wall 311 may be trapezoidal as shown in fig. 10, circular arc as shown in fig. 11, or other polygonal shapes, but this design may also be adopted for the end of the second conductive wall 321.
The application also provides a display device of an embodiment. As shown in fig. 12, the display device 120 includes a display Area (AA) 121 and a non-display Area 122, wherein a Bonding Area 123 is disposed in the non-display Area 122, and the electrical connection assembly 30 can be used as an electrical connection element in the Bonding Area 123. A plurality of Bonding pads are disposed in the Bonding area 123, each Bonding Pad may be regarded as the first terminal 31, the second terminal 32 may be a COF (Chip On Film) pin, and a signal line, such as a data line, of the display device 120 is connected to an area where the first terminal 31 and the second terminal 32 inserted therein are located. The first terminals 31 and the second terminals 32 are electrically connected in a one-to-one correspondence manner, so that the COF can be electrically connected to the Bonding area 123.
Since the display device 120 also has the same structural design as the electrical connection assembly 30, the display device 120 also has the same advantages as described above.
It should be understood that the present application does not limit the specific types of the first terminals 31 and the second terminals 32, in other words, the specific structural elements of the first terminals 31 and the second terminals 32 are different in different application scenarios or electrical connection environments. For example, in the display device 120, the second terminal 32 may be a pin of any one of a driver IC and an FPC (flexible printed Circuit).
It should be noted that the above-mentioned embodiments are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by the contents of the specification and the drawings, such as the combination of technical features between the embodiments, or the direct or indirect application to other related technical fields, are also included in the scope of the present application.

Claims (8)

1. An electrical connection assembly, comprising:
the conductive adhesive comprises conductive particles coated with an insulating polymer layer;
the first terminal comprises a plurality of first conductive walls which are arranged at intervals, and the distance between every two adjacent first conductive walls is smaller than the diameter of the conductive particles;
the second terminal comprises at least two second conductive walls which are arranged at intervals;
when the first terminal and the second terminal are connected in an inserting mode, the conductive adhesive is filled between the first terminal and the second terminal, the first conductive walls and the second conductive walls are arranged at intervals along the direction perpendicular to the first conductive walls, the distance between every two adjacent first conductive walls and the distance between every two adjacent second conductive walls are smaller than the diameter of the conductive particles, and the conductive particles with cracked insulating polymer layers are arranged between every two adjacent first conductive walls and between every two adjacent second conductive walls and are electrically connected through the conductive particles;
the electric connection assembly comprises a plurality of first terminals and a plurality of second terminals, wherein the distance between every two adjacent first terminals and the distance between every two adjacent second terminals are both larger than the diameter of the conductive particles, and insulation is realized through the insulating polymer layer wrapped on the surfaces of the conductive particles.
2. The electrical connection assembly of claim 1, wherein at least one of the first and second conductive walls has a radial dimension that is smaller than a radial dimension of the body portion.
3. The electrical connection assembly as claimed in claim 2, wherein at least one of the first and second conductive walls has a trapezoidal or circular arc-shaped cross section at an end thereof.
4. The electrical connection assembly of claim 1, wherein the second terminal includes two of the second conductive walls, all of the first conductive walls of the first terminal being disposed between the two second conductive walls.
5. A display device, comprising the electrical connection assembly according to any one of claims 1 to 4.
6. An electrical connection method, comprising:
providing a first connecting piece with a first terminal and a second connecting piece with a second terminal, wherein the first terminal comprises a plurality of first conductive walls arranged at intervals, and the second terminal comprises at least two second conductive walls arranged at intervals;
forming a conductive adhesive on the second connecting piece, wherein the conductive adhesive is filled between two adjacent second conductive walls and comprises conductive particles with insulating polymer layers wrapped on the surfaces, and the diameter of each conductive particle is larger than the distance between two adjacent first conductive walls;
the first connecting piece and the second connecting piece are oppositely pressed, the first conductive walls and the second conductive walls are arranged at intervals along the direction perpendicular to the first conductive walls, and the distance between every two adjacent first conductive walls and the distance between every two adjacent second conductive walls are smaller than the diameter of the conductive particles, so that the insulating polymer layers of the conductive particles between every two adjacent first conductive walls and between every two adjacent second conductive walls are broken and are electrically connected through the conductive particles;
the first connecting piece is provided with a plurality of first terminals, the second connecting piece is provided with a plurality of second terminals, the distance between every two adjacent first terminals and the distance between every two adjacent second terminals are larger than the diameter of the conductive particles, and when the first connecting piece and the second connecting piece are pressed relatively, the space between every two adjacent first terminals and the space between every two adjacent second terminals are achieved through insulating polymer layers wrapped on the surfaces of the conductive particles.
7. The electrical connection method as claimed in claim 6, wherein at least one of the first and second conductive walls has a radial dimension of the end portion smaller than a radial dimension of the main body portion.
8. The electrical connection method according to claim 6, wherein the second terminal includes two second conductive walls, and all of the first conductive walls of the first terminal are disposed between the two second conductive walls.
CN201810896462.4A 2018-08-08 2018-08-08 Electric connection assembly, display device and electric connection method Active CN109037998B (en)

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CN109037998B true CN109037998B (en) 2020-06-05

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