CN216213461U

CN216213461U - Display module and display device

Info

Publication number: CN216213461U
Application number: CN202122021854.6U
Authority: CN
Inventors: 傅晓亮; 张燚; 张斌; 吴承龙; 沈学立
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-04-05
Anticipated expiration: 2031-08-25

Abstract

The disclosure relates to the technical field of display, and discloses a display module and a display device; the display module comprises a display panel, a flexible circuit board, an adhesive layer and a protective film; the flexible circuit board is bound with the display panel; the bonding layer is arranged on one side of the flexible circuit board, and at least one corner part of the bonding layer, which is close to one side of the display panel, is of a unfilled corner structure; the protection film is located the one side of adhesive linkage far away from flexible circuit board, and the one side that is provided with the unfilled corner structure tears the side for playing of protection film. When the stress of the tearing-off protective film is relatively large, the unfilled corner structure is arranged on the bonding layer on the tearing-off side and can block or reduce the transmission of the stress, so that the stress transmitted to the binding position is relatively small, the binding position is prevented from tilting, and abnormal display caused by poor contact between the display panel and the flexible circuit board is avoided; and only the corner part is provided with the unfilled corner structure, so that the area of a glue-free area is smaller, and the edge of the flexible circuit board cannot be warped badly.

Description

Display module and display device

Technical Field

The disclosure relates to the technical field of display, in particular to a display module and a display device comprising the same.

Background

Currently, referring to fig. 1, in a manufacturing process of an OLED (Organic Light-Emitting display) product, an adhesive layer 3 is provided on a back surface of an FPC (flexible circuit board 2), and a protective film 4 is provided on a side of the adhesive layer 3 away from the flexible circuit board 2. After the display panel 1 and the flexible circuit board 2 are bonded, the protective film 4 needs to be removed, and the adhesive layer 3 needs to be bonded to an SCF (heat dissipation film).

However, when the protective film 4 is removed, the bonding position may be lifted due to stress generated during film removal, thereby causing abnormal display due to poor contact between the display panel 1 and the flexible circuit board 2.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

The purpose of this disclosure is to overcome the shortcoming that the tilting is easily produced at the binding position of above-mentioned prior art, provide a display module assembly that the binding position is difficult to produce the tilting and include this display module assembly's display device.

According to an aspect of the present disclosure, there is provided a display module including:

a display panel;

a flexible circuit board bound with the display panel;

the bonding layer is arranged on one side of the flexible circuit board, and at least one corner part of the bonding layer, which is close to one side of the display panel, is of a unfilled corner structure;

the protection film is arranged on one side, far away from the flexible circuit board, of the bonding layer, and one side, provided with the unfilled corner structure, of the protection film is the tearing side.

In an exemplary embodiment of the present disclosure, the unfilled corner structure is provided as a chamfered structure.

In an exemplary embodiment of the present disclosure, the chamfer structure is a chamfer or a round chamfer.

In an exemplary embodiment of the present disclosure, a distance between one end of the straight chamfered edge of the inclined chamfer, which is far away from the display panel, and the display panel is greater than or equal to 3 mm.

In an exemplary embodiment of the present disclosure, an included angle between a straight chamfered edge of the oblique chamfer and a first direction is greater than or equal to 30 degrees and less than or equal to 45 degrees, and the first direction is consistent with a tearing direction of the protective film.

In an exemplary embodiment of the present disclosure, a connection line of two end points of the arc-shaped chamfered edge of the circular chamfer is the same as the straight chamfered edge of the oblique chamfer.

In an exemplary embodiment of the present disclosure, the edge line of the unfilled corner structure is provided as a curve recessed toward the adhesive layer side.

In an exemplary embodiment of the disclosure, a distance between one end of the edge line of the unfilled corner structure, which is far away from the display panel, and the display panel is greater than or equal to 3 mm.

In an exemplary embodiment of the disclosure, an included angle between a connecting line of two end points of a side line of the unfilled corner structure and a first direction is greater than or equal to 30 degrees and less than or equal to 45 degrees, and the first direction is consistent with the tearing direction of the protective film.

In an exemplary embodiment of the present disclosure, the unfilled corner structure comprises:

the first edge extends along a first direction, and the first direction is consistent with the tearing direction of the protective film;

the second edge line extends along the second direction and extends to one side edge of the bonding layer, which is close to the display panel, the second direction is intersected with the first direction, and one end of the second edge line, which is far away from the display panel, is connected with one end of the first edge line.

In an exemplary embodiment of the present disclosure, a distance between the first edge along the line and the display panel is greater than or equal to 3 mm.

According to another aspect of the present disclosure, there is provided a display device including: the display module assembly of any one of the above.

The utility model discloses a display module assembly, display panel and flexible circuit board bind, are provided with the adhesive linkage in one side of flexible circuit board, set up to the unfilled corner structure in at least one bight that is close to display panel one side of adhesive linkage, are provided with the protection film in one side of keeping away from flexible circuit board of adhesive linkage, and one side that is provided with the unfilled corner structure tears the side for playing of protection film. When the stress of the torn protective film is large, the unfilled corner structure is arranged on the bonding layer on the torn side, the stress transmission is transmitted along a straight line, and the unfilled corner structure can block or reduce the stress transmission, so that the stress transmitted to the binding position is small, the binding position is prevented from tilting, and abnormal display caused by poor contact between the display panel and the flexible circuit board is avoided; and only the corner part is provided with the unfilled corner structure, so that the area of a glue-free area is smaller, and the edge of the flexible circuit board cannot be warped badly.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic structural diagram of a display module in the prior art.

Fig. 2 is a schematic structural diagram of a display module in the related art.

Fig. 3 is a schematic structural diagram of a display module according to a first exemplary embodiment of the disclosure.

Fig. 4 is a schematic diagram of a mechanical triangular relationship when the protective film is removed.

Fig. 5 is a schematic structural diagram of a display module according to a second exemplary embodiment of the disclosure.

Fig. 6 is a schematic structural diagram of a display module according to a third exemplary embodiment of the disclosure.

Fig. 7 is a schematic structural diagram of a display module according to a fourth exemplary embodiment of the disclosure.

Description of reference numerals:

1. a display panel; 11. a first binding region;

2. a flexible circuit board; 21. a second binding region;

3. an adhesive layer; 31. a unfilled corner structure; 311. straight chamfering edges; 312. arc-shaped chamfering edges; 313. a curve; 314. the first edge line; 315. a second edge line; 32. an adhesion auxiliary layer;

4. and (5) protecting the film.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

The inventor of the present application found that, when the protective film 4 is removed, the bonding position may be tilted due to stress generated when the protective film is removed when the adhesive layer 3 is located at a close distance from the bonding position between the flexible circuit board 2 and the display panel 1. Referring to fig. 2, in the related art, when the distance between the edge of the adhesive layer 3 close to the display panel 1 and the display panel 1 is increased, specifically, through numerous tests, it is obtained that when the distance a between the edge of the adhesive layer 3 close to the display panel 1 and the display panel 1 is greater than or equal to 3mm, stress generated when the protective film 4 is torn off does not cause the defect of the bound position being tilted; however, such an arrangement causes a new problem that the edge of the flexible circuit board 2 is undesirably lifted in the non-adhesive region because a part of the region of the flexible circuit board 2 close to the display panel 1 is not adhered with the adhesive layer 3.

The present disclosure provides a display module, as shown in fig. 3 to 6, which may include a display panel 1, a flexible circuit board 2, an adhesive layer 3, and a protective film 4; the flexible circuit board 2 is bound with the display panel 1; the bonding layer 3 is arranged on one side of the flexible circuit board 2, and at least one corner part of the bonding layer 3 close to one side of the display panel 1 is provided with a unfilled corner structure 31; the protection film 4 is arranged on one side, far away from the flexible circuit board 2, of the bonding layer 3, and the side provided with the unfilled corner structure 31 is the tearing side of the protection film 4.

According to the display module, when the stress of the protective film 4 is torn off, the unfilled corner structure 31 is arranged on the bonding layer 3 on the tearing side, the stress transmission is transmitted along a straight line, and the unfilled corner structure 31 can block or reduce the stress transmission, so that the stress transmitted to the binding position is smaller, the binding position is prevented from tilting, and abnormal display caused by poor contact between the display panel 1 and the flexible circuit board 2 is avoided; and the unfilled corner structure 31 is arranged only at the corner part, so that the area of a glue-free area is small, and the defect of tilting of the edge of the flexible circuit board 2 is avoided.

In the present exemplary embodiment, the display panel 1 has a display area and a non-display area connected to the display area, a first binding area 11 is disposed on a side of the non-display area away from the display area, and a plurality of first binding pins are disposed in the first binding area 11. The display panel 1 may be a flexible display panel 1, but of course, may also be a non-flexible display panel 1.

In the present exemplary embodiment, the flexible circuit board 2 has a second bonding region 21, the second bonding region 21 is disposed at one side edge portion of the flexible circuit board 2, and a plurality of second bonding pins are disposed at the second bonding region 21. After the second binding region 21 and the first binding region 11 are bound together, the plurality of second binding pins and the plurality of first binding pins are connected together in a one-to-one correspondence manner, so that the electric signals on the display panel 1 and the flexible circuit board 2 can be transmitted mutually.

An adhesive layer 3 is provided on one side of the flexible circuit board 2. Specifically, when the flexible circuit board 2 is not bent, the adhesive layer 3 is disposed on a side of the flexible circuit board 2 away from the display panel 1; after the flexible circuit board 2 is bent to the non-display surface of the display panel 1, the adhesive layer 3 is located between the display panel 1 and the flexible circuit board 2, and the adhesive layer 3 can adhere the flexible circuit board 2 and the heat dissipation film of the display panel 1 together. The adhesive layer 3 may be a conductive adhesive so that the flexible circuit board 2 and the heat dissipation film are connected and adhered together.

A protective film 4 is arranged on one side of the adhesive layer 3, which is far away from the flexible circuit board 2, and the protective film 4 protects the adhesive layer 3 and prevents the adhesive layer 3 from being adhered to other devices. When the adhesive layer 3 needs to be adhered to the heat dissipation film subsequently, the protective film 4 is torn off, so that the adhesive layer 3 can be adhered to the heat dissipation film, but when the protective film 4 is torn off, the second binding region 21 of the flexible circuit board 2 is easily separated from the first binding region 11 by the generated stress, so that the binding position is tilted, poor contact between the second binding region 21 and the first binding region 11 is caused, and the display effect is affected.

In order to avoid the risk that the binding position is tilted due to the stress generated when the protective film 4 is torn off; and avoid the defect that the edge of the flexible circuit board 2 is warped; a corner cut structure 31 is provided at least one corner portion of the adhesive layer 3 on the side close to the display panel 1. Because the stress of the tearing-off point position is the largest in the process of tearing off the protective film 4, one side provided with the unfilled corner structure 31 is taken as the tearing-off side of the protective film 4, when the protective film 4 is torn off, the corner part of the bonding layer 3 close to one side of the display panel 1 is not the tearing-off point position, and the stress is smaller, so that the stress transmitted to the second binding region 21 and the first binding region 11 is smaller, and the risk of tilting the binding position is avoided; moreover, the adhesive layer 3 is not provided only at the corner, the non-adhesive area is small, and the edge of the flexible circuit board 2 does not have the defect of lifting.

In the present exemplary embodiment, the unfilled corner structures 31 are provided at both corner portions of the adhesive layer 3 on the side closer to the display panel 1; so that both sides of the protective film 4 can be used as tearing sides to be suitable for more process occasions.

The unfilled corner structure 31 may be provided as a chamfered structure.

Referring to fig. 3, the chamfering structure may be an oblique chamfer, and a maximum distance B between the straight chamfered edge 311 of the oblique chamfer and the display panel 1 is greater than or equal to 3mm, that is, a distance B between one end of the straight chamfered edge 311 of the oblique chamfer, which is far away from the display panel 1, and the display panel 1 is greater than or equal to 3 mm. The stress generated by tearing off the protective film 4 is guaranteed not to cause the binding position to tilt, so that abnormal display caused by poor contact between the display panel 1 and the flexible circuit board 2 is avoided.

In addition, the included angle between the straight chamfered edge 311 of the oblique chamfer and the first direction is not less than 30 degrees and not more than 45 degrees, and the first direction is the same as the tearing direction of the protective film 4.

The tear-off side of the protective film 4 is the side from which the protective film 4 starts to be torn off, and the tearing-off direction of the protective film 4 is the direction from the tear-off side to the other side. For example, the right side in fig. 3 to 6 is taken as the tear-off side of the protective film 4; the tearing direction of the protective film 4 is from right to left; the left side in fig. 3-6 is taken as the tear-off side of the protective film 4; the tearing direction of the protective film 4 is from left to right.

When the protective film 4 is removed, the stress generated in the second bonding region 21 of the flexible circuit board 2 is "M1", even though the minimum stress generated in the bonding position is about "M1". When the protective film 4 is removed, the stress of the second bonding region 21 of the flexible circuit board 2 is "M2", that is, the maximum stress for preventing the bonding position from tilting is about "M2". The two tests were performed several times and then averaged. The relationship between "M1" and "M2" was obtained as follows:

M2＝2/3×M1。

referring to fig. 4, a mechanical trigonometric relationship is established based on the above relationship: f2 is not more than 2/3 XF 1, wherein F1 is the stress of a tearing point when the protective film 4 is torn off; f2 is the largest force component transmitted by F1 to the binding position when the protective film 4 is torn off. So the safe stress to the binding position when the protective film 4 is torn off can be guaranteed. 2/3 ≈ 0.67, cos47.9 ° ≈ 0.67. therefore, the angle of the straight chamfered edge 311 of the oblique chamfer with the first direction is 47.9 degrees or less.

Although the included angle between the straight chamfered edge 311 of the oblique chamfer and the first direction is calculated to be 47.9 degrees or less, in order to further reduce the risk that the binding position is tilted due to stress generated when the protective film 4 is removed, a certain safety range is set, and the included angle between the straight chamfered edge 311 of the oblique chamfer and the first direction is limited to be 45 degrees or less.

Considering that the smaller the included angle between the straight chamfered edge 311 of the oblique chamfer and the first direction is, the larger the area of the adhesive-free region of the flexible circuit board 2 is, and the greater the risk of the flexible circuit board 2 warping is, therefore, the included angle between the straight chamfered edge 311 defining the oblique chamfer and the first direction is greater than or equal to 30 degrees.

In addition, as shown in fig. 5, in the second exemplary embodiment of the present disclosure, the chamfer structure may also be a round chamfer; specifically, a line connecting two end points of the arc-shaped chamfered edge 312 of the circular chamfer is the same as the straight chamfered edge 311 of the oblique chamfer, that is, on the basis of the oblique chamfer, the adhesion auxiliary layer 32 is further provided on the side of the oblique chamfer away from the center of the adhesive layer 3, and the chamfered edge of the circular chamfer may be in the shape of an arc, an elliptic arc, a parabolic arc, or the like. Of course, the auxiliary adhesive layer 32 is integrally connected to the adhesive layer 3 and is formed by the same glue application process.

Since the transmission of the stress is transmitted in a straight line, when the protective film 4 is peeled off, the generated stress is transmitted to the binding position along the straight chamfered edge 311 of the chamfer, and is not transmitted to the binding position along the adhesion auxiliary layer 32. Therefore, the stress generated in the present exemplary embodiment is substantially the same as the stress generated in the previous exemplary embodiment, and the risk of the binding position being lifted up does not occur. Moreover, the area of the adhesive layer 3 in the present exemplary embodiment is increased by the area of the adhesion auxiliary layer 32 as compared with the area of the adhesive layer 3 in the previous exemplary embodiment, and therefore, the risk of the flexible circuit board 2 in the present exemplary embodiment being warped is smaller.

Of course, in some other exemplary embodiments of the present disclosure, the chamfered edge of the circular chamfer may also be tangent to the straight chamfered edge 311 of the oblique chamfer, and the arrangement is such that the chamfered edge of the circular chamfer does not exceed the straight chamfered edge 311 of the oblique chamfer, so as to ensure that the generated stress does not cause the risk of tilting of the binding position when the protective film 4 is torn off.

Also, as shown in fig. 6, in the third exemplary embodiment of the present disclosure, the edge line of the unfilled corner structure 31 is provided as a curved line 313 recessed toward the adhesive layer 3 side. The curve 313 may be a circular arc, an elliptical arc, a parabolic arc, or the like.

Specifically, the distance D between the end of the edge line (the curve 313) of the corner-lacking structure 31 away from the display panel 1 and the display panel 1 is equal to or greater than 3mm, that is, the maximum distance D between the edge line (the curve 313) of the corner-lacking structure 31 and the display panel 1 is equal to or greater than 3 mm. The risk that the binding position is tilted up is avoided due to the stress generated by tearing off the protective film 4.

An included angle β between a connecting line of two end points of the edge line (curve 313) of the unfilled corner structure 31 and the first direction is greater than or equal to 30 degrees and less than or equal to 45 degrees, and the first direction is consistent with the tearing direction of the protective film 4. The calculation method of the included angle β is the same as that in the first exemplary embodiment, and therefore, the description thereof is omitted.

Similarly, since the stress is transmitted along a straight line and must be transmitted to the display panel 1 through the adhesive layer 3, in the present exemplary embodiment, an included angle between the stress transmission direction and the first direction is much smaller than that in the first exemplary embodiment, and therefore, a path of the stress transmitted to the display panel 1 is increased, and the stress is absorbed by the adhesive layer 3 more during the stress transmission process, and thus, the stress transmitted to the display panel 1 is also reduced. The stress generated by tearing off the protective film 4 is further ensured not to cause the binding position to tilt, so that abnormal display caused by poor contact between the display panel 1 and the flexible circuit board 2 is avoided.

Further, as shown in fig. 7, in a fourth exemplary embodiment of the present disclosure, the unfilled corner structure 31 may include a first edge line 314 and a second edge line 315; the first edge line 314 extends along a first direction, the first edge line 314 extends from one side edge of the adhesive layer 3 to the center of the adhesive layer, and the first direction is consistent with the tearing direction of the protective film 4; the second edge line 315 extends along a second direction perpendicular to the first direction and extends to a side edge of the adhesive layer 3 close to the display panel 1, and one end of the second edge line 315 far away from the display panel 1 is connected to one end of the first edge line 314. Namely, a right-angled unfilled corner structure 31 is formed by removing a part of the adhesive layer 3 at both ends of the side close to the display panel 1.

The distance E between the first edge line 314 and the display panel 1 is equal to or greater than 3 mm. So as to ensure that the stress generated by tearing off the protective film 4 does not cause the binding position to be tilted.

Similarly, since the stress is transmitted along a straight line and must be transmitted to the display panel 1 through the adhesive layer 3, in the present exemplary embodiment, when the protective film 4 is torn off, no stress is transmitted to the display panel 1 when the stress is maximum, and until the end of the first edge is torn off, the stress is transmitted to the display panel 1, and the stress at this time is smaller than the stress when the protective film 4 is just torn off, therefore, the stress transmitted to the display panel 1 is also smaller, so that the stress generated by tearing off the protective film 4 does not cause the risk of tilting of the binding position, thereby avoiding abnormal display caused by poor contact between the display panel 1 and the flexible circuit board 2.

Of course, in some other exemplary embodiments of the present disclosure, the angle between the second direction and the first direction may be greater than or less than 90 degrees. Similarly, the stress generated by tearing off the protective film 4 can be ensured not to cause the binding position to tilt, so that abnormal display caused by poor contact between the display panel 1 and the flexible circuit board 2 is avoided.

According to the same inventive concept, the disclosed exemplary embodiments provide a display device, which may include any one of the display modules described above. The specific structure of the display module has been described in detail above, and therefore, the detailed description thereof is omitted here.

The specific type of the display device is not particularly limited, and any display device commonly used in the art may be used, specifically, for example, a mobile device such as a mobile phone, a wearable device such as a watch, a VR device, and the like.

It should be noted that, the display device includes other necessary components and components besides the display module, taking a display as an example, specifically, such as a housing, a circuit board, a power line, and the like, and those skilled in the art can supplement the display device accordingly according to the specific use requirements of the display device, and details are not described herein.

Compared with the prior art, the beneficial effects of the display device provided by the exemplary embodiment of the present invention are the same as those of the display module provided by the above exemplary embodiment, and are not described herein again.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A display module, comprising:

a display panel;

a flexible circuit board bound with the display panel;

2. The display module assembly of claim 1, wherein the unfilled corner structure is configured as a chamfered structure.

3. The display module according to claim 2, wherein the chamfer structure is a bevel chamfer or a round chamfer.

4. The display module according to claim 3, wherein a distance between one end of the straight chamfered edge of the inclined chamfer, which is far away from the display panel, and the display panel is greater than or equal to 3 mm.

5. The display module according to claim 4, wherein an included angle between the straight chamfered edge of the oblique chamfer and a first direction is greater than or equal to 30 degrees and less than or equal to 45 degrees, and the first direction is consistent with the tearing direction of the protective film.

6. The display module according to claim 5, wherein a connecting line of two end points of the arc-shaped chamfered edge of the circular chamfer is the same as the straight chamfered edge of the oblique chamfer.

7. The display module according to claim 1, wherein the edge line of the unfilled corner structure is a curve recessed toward the adhesive layer.

8. The display module assembly according to claim 7, wherein a distance between one end of the edge line of the unfilled corner structure far away from the display panel and the display panel is greater than or equal to 3 mm.

9. The display module according to claim 8, wherein an included angle between a connecting line of two end points along the edge line of the unfilled corner structure and a first direction is greater than or equal to 30 degrees and less than or equal to 45 degrees, and the first direction is consistent with the tearing direction of the protective film.

10. The display module assembly of claim 1, wherein the unfilled corner structure comprises:

11. The display module of claim 10, wherein the distance between the first edge and the display panel along the line is greater than or equal to 3 mm.

12. A display device, comprising: the display module according to any one of claims 1 to 11.