CN210245503U - Chip on film binding structure, display module and terminal equipment - Google Patents
Chip on film binding structure, display module and terminal equipment Download PDFInfo
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- CN210245503U CN210245503U CN201921826185.6U CN201921826185U CN210245503U CN 210245503 U CN210245503 U CN 210245503U CN 201921826185 U CN201921826185 U CN 201921826185U CN 210245503 U CN210245503 U CN 210245503U
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Abstract
The utility model provides a chip on film binding structure, display module assembly and terminal equipment, this chip on film binding structure includes: a chip on film including a first pin; the flexible circuit board comprises a second pin, and the second pin is connected with the first pin; the first pin comprises a first end and a second end which are opposite, the second pin comprises a third end and a fourth end which are opposite, and the first end of the first pin and the third end of the second pin are overlapped to form an effective contact area; the second end of the first pin and the fourth end of the second pin respectively extend out of two opposite sides of the effective contact area, a first exposed area is formed at the second end of the first pin, and a second exposed area is formed at the fourth end of the second pin. The utility model discloses a flip chip film binding structure, display module assembly and terminal equipment when satisfying FPC and COF and binding the technology demand, effectively improve FPC pin exposed part perishable problem, are favorable to reducing that the display screen shows badly, improve the reliance, improve product life.
Description
Technical Field
The utility model relates to a show technical field, especially relate to a cover brilliant film and bind structure, display module assembly and terminal equipment.
Background
The current OLED (organic light emitting diode) display module has a complex process flow, along with the increase of the diversity of the functional requirements of people and the reduction requirements on the volume size of the display module, the process requirements of laser cutting, binding, fitting and the like of the display module are higher and higher, and the precision requirements of each process are higher and higher.
Currently, a COF (Chip On Film, or, Chip On Flex) technology is adopted in an OLED display module to realize an ultra-narrow frame. The chip on film technology is a technology for bonding a bonding pad on a driving chip and a pin on a flexible circuit board by thermocompression bonding. The flexible circuit board comprises a base, a metal layer and a paint film, wherein the paint film exposes two ends of the metal layer, one part of the exposed two parts is bound with the display substrate, and the other part (COF Pin) is bound with the Pin of the flexible circuit board FPC. The problem that the display module is poor due to the fact that the exposed part of an FPC pin is easy to corrode in the conventional COF technology of the OLED display module is solved, and the yield and the service life of the module are affected.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cover brilliant film binding structure, display module assembly and terminal equipment when satisfying FPC and COF and binding the technology demand, effectively improve the problem that FPC pin exposed part is corroded, are favorable to reducing the display screen and show badly, improve the reliability, improve product life.
The utility model provides a technical scheme as follows:
the embodiment of the utility model provides a chip on film binding structure, include:
the chip on film comprises a first pin;
the flexible circuit board comprises a second pin, and the second pin is connected with the first pin;
the first pin includes opposing first and second ends,
the second pin includes opposing third and fourth ends,
the first end of the first pin is overlapped with the third end of the second pin to form an effective contact area;
the second end of the first pin and the fourth end of the second pin respectively extend out of two opposite sides of the effective contact area, a first exposed area is formed at the second end of the first pin, and a second exposed area is formed at the fourth end of the second pin.
Illustratively, the first exposed region has a first length in a direction extending from the first end to the second end;
the second exposed region has a second length in a direction extending from the first end to the second end;
the first length and the second length are less than 0.3 mm.
Illustratively, the first length is 0.05 mm to 0.20 mm.
Illustratively, the first length is 0.1 mm.
Illustratively, the second length is 0.1 to 0.2 mm.
Illustratively, the second length is 0.1 mm.
Illustratively, the chip on film includes:
a substrate;
the metal layer is arranged on the substrate, and the metal layer is connected with a drive IC;
and the paint film is arranged on the metal layer, two ends of the metal layer are exposed by the paint film, and the two exposed parts are the first pin and a third pin used for being connected with a display substrate respectively.
The embodiment of the utility model provides a display module assembly is still provided, include as above the structure is bound to cover brilliant film.
Illustratively, the display module is an OLED display module.
The embodiment of the utility model provides a still provide a terminal equipment, include as above display module assembly.
The utility model discloses the beneficial effect who brings as follows:
in the scheme, the second end of the first Pin of the chip on film extends out of the effective contact area between the first Pin and the second Pin of the flexible circuit board, namely, the first Pin of the chip on film is designed to be longer than the effective contact area, so that compared with the mode that only the FPC Pin is exposed but the COF Pin is not exposed (namely, the length of the COF Pin is equal to the length of the effective contact area), the first Pin of the COF is designed to be longer than the effective contact area, therefore, because the length of the COF Pin (the first Pin) is lengthened, the length of the effective contact area of the first Pin and the second Pin is ensured to be unchanged, the exposed part of the FPC Pin (the second Pin) can be reduced, thereby realizing the process requirements of FPC and COF Bonding and improving the problem that the exposed part of the FPC is easy to corrode at the same time of meeting the process requirements of FPC and COF Bonding, the display screen is beneficial to reducing bad display, improving the reliability and prolonging the service life of the product.
Drawings
FIG. 1 is a schematic diagram of a bonding structure of a chip on film in the prior art;
fig. 2 is a schematic structural diagram of a bond structure of a chip on film according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
As shown in fig. 1, currently, during the FOF bonding process (COF and FPC bonding process) of the OLED display module, the COF Pin2 and the FPC Pin1 need to be in sufficient contact, that is, the effective contact area of the COF Pin2 and the FPC Pin1 needs to have a certain length (a is shown as an effective contact area in fig. 1), because of the positioning of the current bonding equipment and the product tolerance, in order to ensure that the effective contact area a of the FPCpin1 and the COF Pin2 has a certain length, as shown in fig. 1, the length of the FPC Pin1 is longer than the length of the COF Pin2, for example, the length of the FPC Pin1 shown in fig. 1 is about 0.30mm longer than the length of the COF Pin 2; one end of the FPC Pin1 is flush with the other end of the COF Pin2, the other end of the FPC Pin1 is exposed, the COF Pin is not exposed at all, the exposed part of the FPC Pin2 can be oxidized and corroded and even cracks can be generated along with the lapse of time, so that the circuit is peeled off and the resistance is increased, abnormal screen display can be caused, the problems of point defects, bright lines and the like of a point screen can be caused, local heating and the like can be caused, the product yield of a module factory is seriously influenced, and the service life of a product is influenced.
Bind technology to OLED display device FOF and exist because FPC Pin exposes the easy oxidation corrosion of part, influence product life scheduling problem, the embodiment of the utility model provides a cover brilliant film and bind structure, display module assembly and terminal equipment when satisfying FPC and COF and binding the technology demand, effectively improve the problem that FPC Pin exposes the part and is corroded, is favorable to reducing the display screen and shows badly, improves the reliability, improves product life.
As shown in fig. 2, a bonding structure for chip on film provided by the embodiment of the present invention includes:
a Chip On Film (COF) 10, the COF 10 including a first lead 100;
the Flexible Printed Circuit (FPC) 20 comprises a second pin 200, and the second pin 200 is connected with the first pin 100;
the first lead 100 includes opposing first and second ends,
the second pin 200 includes opposing third and fourth ends,
the first end of the first pin 100 and the third end of the second pin 200 are overlapped to form an effective contact area A;
the second end of the first lead 100 and the fourth end of the second lead 200 respectively extend from two opposite sides of the effective contact area a, and a first exposed area 100a is formed at the second end of the first lead 100, and a second exposed area 200a is formed at the fourth end of the second lead 200.
In the above solution, by extending the second end of the first Pin 100 of the COF 10 out of the effective contact area a between the first Pin 100 and the second Pin 200 of the FPC 20, that is, the designed length of the first Pin 100 of the COF 10 is longer than the length of the effective contact area a, compared with the aforementioned way that only the FPC Pin is exposed and the COF Pin is not exposed (that is, the length of the COF Pin is equal to the length of the effective contact area), the first Pin 100 of the COF 10 is designed to have a length longer than the length of the effective contact area a, so that, due to the lengthened length of the COF Pin (the first Pin 100), while the length of the effective contact area a between the first Pin 100 and the second Pin 200 is ensured to be unchanged, the exposed portion of the second Pin (200) can be reduced, thereby realizing the COF meeting the FPC and Bonding process requirements, the problem that the exposed part of the FPC pin is easy to corrode is solved, poor display of the display screen is reduced, the reliability is improved, and the service life of a product is prolonged.
In an exemplary embodiment, the first exposed region 100a has a first length L1 in a direction extending from the first end to the second end; the second exposed region 200a has a second length L2 in a direction extending from the third end to the fourth end; the first length L1 and the second length L2 are less than 0.3 mm.
As shown in fig. 1, in one embodiment of FPC and COF design, FPC Pin1 length is 0.30mm longer than COF Pin2 to ensure effective Pin contact area. With the solution of fig. 2, the length of the second exposed region 200a of the FPC Pin (i.e. the second Pin 200) exposed outside the effective contact region a may be less than 0.3 mm.
Illustratively, the first length L1 is 0.05-0.20 mm; illustratively, the second length L2 is 0.1-0.2 mm.
By adopting the above scheme, the length of the first pin 100 extending out of the effective contact area a can be 0.05-0.20 mm, and the length of the second pin 200 extending out of the effective contact area a can be 0.1-0.2 mm.
Preferably, the first length L1 is 0.1 mm; the second length L2 is 0.1 mm.
Adopt the scheme of above-mentioned figure 2, COF Pin and FPC Pin's length all respectively is 0.1mm than effective contact area A's length, compare in prior art, can guarantee when effective contact area A's length is unchangeable for FPC Pin length reduces 0.2mm, COF Pin increases 0.1mm, has so both satisfied the technological condition, can prevent FPC Pin corruption again, is favorable to reducing the display screen and shows badly, improves product life.
Table 1 shows the reliability results obtained when the FPC pin length is designed to be 0.3mm longer than the COF pin, compared with the bonding structure of the COF 10 shown in fig. 2 in the above embodiment.
| Item | Flip chip film binding structure in prior art | The utility model discloses cover brilliant film and bind structure |
| 8585 |
2/15Pin corrosion | No corrosion |
| THO | 2/15Pin corrosion | No corrosion |
Table 1
By adopting 8585 operation (i.e. double 85 test, which means an aging test is performed under the conditions of high temperature of 85 ℃ and relative humidity of 85%) and THO (i.e. high temperature and high humidity operation test, which means an aging test is performed under the conditions of high temperature of 60 ℃ and relative humidity of 90%), as shown in table 1, it can be seen that FPCPin corrosion of 2/15 occurs when the length of the FPC pin shown in fig. 1 is designed to be 0.3mm longer than the COF pin; and the embodiment of the utility model provides a COF Pin and FPC Pin design among the chip on film COF 10 binding structure, the reliability result is fine, and from this it is visible, the embodiment of the utility model provides a chip on film COF 10 binding structure can prevent FPC Pin effectively and corrode, has solved the bad problem of display screen that FPC Pin corrodes and brings.
In an exemplary embodiment of the present invention, as shown in fig. 2, the chip on film COF 10 includes:
a substrate 11;
a metal layer 12 disposed on the substrate 11, wherein a driving IC is connected to the metal layer 12;
and the paint film 13 is arranged on the metal layer 12, two ends of the metal layer 12 are exposed by the paint film 13, and the two exposed parts are the first pin 100 and a third pin (not shown in the figure) for connecting with a display substrate.
The embodiment of the utility model provides a chip on film COF 10 binding structure is applicable to mobile terminal and all kinds of OLED display module assembly structures, certainly not with this as the limit.
Furthermore, the embodiment of the utility model provides a display module assembly is still provided, include the embodiment of the utility model provides a cover brilliant film COF 10 binding structure. Illustratively, the display module is an OLED display module.
The embodiment of the utility model provides a still provide a terminal equipment, include the embodiment of the utility model provides a display module assembly.
The following points need to be explained:
(1) the drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design.
(2) For purposes of clarity, the thickness of layers or regions in the figures used to describe embodiments of the present disclosure are exaggerated or reduced, i.e., the figures are not drawn on a true scale. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
(3) Without conflict, embodiments of the present disclosure and features of the embodiments may be combined with each other to arrive at new embodiments.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and the scope of the present disclosure should be subject to the claims.
Claims (10)
1. A chip on film bonding structure, comprising:
the chip on film comprises a first pin;
the flexible circuit board comprises a second pin, and the second pin is connected with the first pin; it is characterized in that the preparation method is characterized in that,
the first pin includes opposing first and second ends,
the second pin includes opposing third and fourth ends,
the first end of the first pin is overlapped with the third end of the second pin to form an effective contact area;
the second end of the first pin and the fourth end of the second pin respectively extend out of two opposite sides of the effective contact area, a first exposed area is formed at the second end of the first pin, and a second exposed area is formed at the fourth end of the second pin.
2. The COF bonding structure of claim 1,
the first exposed region has a first length in a direction extending from the first end to the second end;
the second exposed region has a second length in a direction extending from the third end to the fourth end;
the first length and the second length are less than 0.3 mm.
3. The COF bonding structure of claim 2,
the first length is 0.05-0.20 mm.
4. The COF bonding structure of claim 3,
the first length is 0.1 mm.
5. The COF bonding structure of claim 2,
the second length is 0.1-0.2 mm.
6. The COF bonding structure of claim 5,
the second length is 0.1 mm.
7. The COF bonding structure of claim 1,
the chip on film includes:
a substrate;
the metal layer is arranged on the substrate, and the metal layer is connected with a drive IC;
and the paint film is arranged on the metal layer, two ends of the metal layer are exposed by the paint film, and the two exposed parts are the first pin and a third pin used for being connected with a display substrate respectively.
8. A display module comprising the flip-chip-film bonding structure according to any one of claims 1 to 7.
9. The display module according to claim 8, wherein the display module is an OLED display module.
10. A terminal device, characterized in that it comprises a display module according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921826185.6U CN210245503U (en) | 2019-10-28 | 2019-10-28 | Chip on film binding structure, display module and terminal equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921826185.6U CN210245503U (en) | 2019-10-28 | 2019-10-28 | Chip on film binding structure, display module and terminal equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210245503U true CN210245503U (en) | 2020-04-03 |
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ID=69966673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921826185.6U Active CN210245503U (en) | 2019-10-28 | 2019-10-28 | Chip on film binding structure, display module and terminal equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210245503U (en) |
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- 2019-10-28 CN CN201921826185.6U patent/CN210245503U/en active Active
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