CN112599018B

CN112599018B - Display device

Info

Publication number: CN112599018B
Application number: CN202110005434.0A
Authority: CN
Inventors: 张允题
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2022-05-31
Anticipated expiration: 2041-01-05
Also published as: CN112599018A

Abstract

The application provides a display device, which comprises a plane area, a curved surface area arranged on one side of the plane area, a flexible display panel and a back plate structure, wherein the flexible display panel comprises a first plane part, a first bending part, a second bending part, a third bending part and a second plane part which are sequentially arranged; the backboard structure comprises a first backboard and a second backboard, the first backboard comprises a first area and a second area, the first area is arranged corresponding to a first plane portion, the second area is arranged corresponding to a first bending portion, the second backboard comprises a third area and a fourth area, the third area is arranged corresponding to a third bending portion, the fourth area is arranged corresponding to a second plane portion, the backboard structure further comprises a plurality of first openings arranged at intervals, and the first openings are located in the third area of the second backboard. This application has reduced the fracture risk of outside metal wiring, has improved display device's the performance of buckling.

Description

Display device

Technical Field

The application relates to the technical field of display, in particular to a display device.

Background

With the change of aesthetic level of people and the development of mobile terminal products, people gradually pursue the appearance of the mobile phone terminal with a mellow curve, and the curved surface display product becomes a necessary trend of the development of the mobile phone terminal due to the advantages of beautiful arc, non-differentiated appearance and the like.

In the four-curved-surface display product in the prior art, each side surface of the display screen is a curved surface, and in order to shorten the lower frame, the external wiring area at the bottom of the display panel is usually bent to the back of the display panel through a gasket bending process. At this time, the back plate is bent at the area corresponding to the bent portion of the external wiring area. However, the modulus of the back plate is large and the metal traces in the external trace area are densely arranged, so that the risk of breaking the metal traces is increased.

Disclosure of Invention

The application provides a display device to solve the technical problem that because the backplate modulus is great, the fracture risk of outside metal routing increases.

The application provides a display device, it includes the plane district and sets up in the curved surface district of plane district one side, display device still includes:

the flexible display panel comprises a first plane part, a first bending part, a second bending part, a third bending part and a second plane part which are sequentially arranged, wherein the first plane part and the second plane part are both positioned in the plane area, the first plane part is used for displaying, the second plane part is arranged on the non-display side of the first plane part, the second plane part is used for binding a driving device, the first bending part, the second bending part and the third bending part are all positioned in the curved area, the third bending part is arranged on one side, facing the second plane part, of the first bending part, and the curvature of the third bending part is larger than that of the first bending part; and

the back plate structure comprises a first back plate and a second back plate, the first back plate comprises a first area and a second area, the first area corresponds to the first plane portion, the second area corresponds to the first bending portion, the second back plate comprises a third area and a fourth area, the third area corresponds to the third bending portion, the fourth area corresponds to the second plane portion, the back plate structure further comprises a plurality of first openings arranged at intervals, and the first openings are located in the third area of the second back plate.

In the display device described herein, the first opening penetrates the second back plate.

In the display device of the present application, a portion of the second back plate located in the third area has a first bending axis, and the plurality of first openings includes a plurality of first sub-openings located at two sides of the first bending axis.

In the display device of the present application, the plurality of first sub openings on one side of the first bending axis and the plurality of first sub openings on the other side of the first bending axis are symmetrical with respect to the first bending axis.

In the display device, the direction parallel to the first bending shaft is parallel to two adjacent lines on one side of the first bending shaft, and the first sub openings are arranged in a staggered manner.

In the display device, the distance between two adjacent first sub-openings increases from the first bending axis to a direction away from the first bending axis.

In the display device of the present application, the first sub-aperture has a first length in a direction perpendicular to the first bending axis, and the first length decreases from the first bending axis to a direction away from the first bending axis.

In the display device of the present application, the first sub-aperture has a first length in a direction perpendicular to the first bending axis, and the first sub-aperture has a second length in a direction parallel to the first bending axis, the second length being greater than the first length.

In the display device of the present application, the plurality of first openings further include a plurality of second sub openings, the plurality of second sub openings are arranged side by side along the first bending axis, and an opening area of each of the second sub openings is larger than an opening area of each of the first sub openings.

In the display device of the present application, the back plate structure further includes a plurality of second openings disposed at intervals, and the second openings are located in the second region of the first back plate.

In the display device of the present application, a portion of the first back plate located in the second region has a second bending axis, the plurality of second openings includes a plurality of third sub-openings, and the plurality of third sub-openings are located on two sides of the second bending axis.

In the display device described herein, the second back plate has a thickness smaller than that of the first back plate.

Compare in display device among the prior art, the display device that this application provided is through at the structural a plurality of first openings that set up of backplate, and first opening is located the third region of second backplate for the stress that the second backplate produced in the third region can concentrate in a plurality of first openings, and obtain alleviating in a plurality of first openings, thereby reduced the fracture risk of outside metal line, improved display device's bending performance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic top view of a display device provided in the present application.

Fig. 2 is a schematic cross-sectional view of the display device shown in fig. 1 taken along the line O-O'.

Fig. 3 is a schematic top view of a backplane structure of a display device provided in the present application before bonding.

Fig. 4 is a schematic top view of a second backplane of a backplane structure of a display device according to a first embodiment before being bonded.

Fig. 5 is a schematic top view of a second embodiment of a backplane structure of a display device according to the present application before being bonded.

Fig. 6 is a schematic top view of a second backplane of a backplane structure of a display device according to a third embodiment before being bonded.

Fig. 7 is a schematic top view of a fourth embodiment of a second backplane of a backplane structure of a display device provided in the present application before bonding.

Fig. 8 is a schematic top view of a fifth embodiment of a second backplane of a backplane structure of a display device provided in the present application before bonding.

Fig. 9 is a schematic top view of a first backplane of a backplane structure of a display device provided in the present application before bonding.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 to 3, the present application provides a display device 100. The display device 100 includes a cover plate 10, an optical adhesive layer 20, a polarizer 30, a flexible display panel 40, a backplane structure 50, a heat dissipation structure 60, a bending pad 70, an ultraviolet adhesive layer 80, and a driving device 90.

The display device 100 further includes a flat area 101 and a curved area 102 disposed at one side of the flat area 101. In this application, the flat area is a main display area of the display device. The curved region may be located on one or more of the left, right, upper and lower sides of the planar region. The following embodiments of the present application are described by taking the curved surface area located below the planar area as an example, but not limited thereto.

The flexible display panel 40 includes a first flat portion 401, a first curved portion 402, a second curved portion 403, a third curved portion 404, and a second flat portion 405, which are sequentially arranged. The first plane portion 401 and the second plane portion 405 are both located in the plane area 101. The first plane part 401 is used for display. The second flat surface portion 405 is provided on the non-display side of the first flat surface portion 401. The second flat surface portion 405 is used for binding the driving device 90. The first bend 402, the second bend 403, and the third bend 404 are all located at the curved region 102. The third curved portion 404 is provided on a side of the first curved portion 402 facing the second flat portion 405. The curvature of the third curved portion 404 is greater than the curvature of the first curved portion 402.

The driving device 90 includes a driving chip 901 and a flexible circuit board 902. The driving chip 901 is disposed on a side of the second plane portion 405 away from the first plane portion 401. The flexible circuit board 902 is provided at an end portion of the second flat surface portion 405 and extends from the end portion of the second flat surface portion 405 to the non-display side of the first flat surface portion 401.

It should be noted that the flexible display panel 40 may be an organic light emitting diode display panel, and the specific structure of the organic light emitting diode display panel may refer to the prior art, which is not described herein again.

In addition, the first bending section 402 in the present application may display a screen entirely, partially, or not. Neither the second curved portion 403 nor the third curved portion 404 displays a screen. When the first bending portion 402 is used for partially displaying a picture, an area of the first bending portion 402 where the picture is not displayed is provided with an external metal trace. When the first bending part 402 does not display a picture, the entire area of the first bending part 402 is provided with external metal traces. The following embodiments of the present application will be described by taking as an example only the case where the first bending portion 402 does not display a screen, but the present invention is not limited thereto.

The polarizer 30, the optical adhesive layer 20, and the cover plate 10 are sequentially disposed on the display side of the first plane part 401. The polarizer 30 and the optical adhesive layer 20 extend from the first plane portion 401 to the first bending portion 402. The cover plate 10 extends from the first flat surface portion 401 to above the second curved portion 403. The ultraviolet adhesive layer 80 is disposed on the side of the second curved portion 403 having a small curvature. Wherein, the ultraviolet glue layer 80 protects the second bending part 403.

The backplane structure 50 comprises a first backplane 501 and a second backplane 502. The first back plate 501 includes a first area 5011 and a second area 5012. The first area 5011 is provided corresponding to the first plane part 401. The second area 5012 is disposed corresponding to the first bend 402. The second back plate 502 includes a third region 5021 and a fourth region 5022. The third region 5021 is provided corresponding to the third bend 404. The fourth region 5022 is disposed corresponding to the second plane part 405. The material of the back plate structure 50 may be PET (Polyethylene terephthalate), or may be other materials having a supporting function, which is not limited in this application.

The heat dissipation structure 60 is disposed on a side of the first back plate 501 away from the first plane portion 401. The heat dissipation structure 60 is used for dissipating heat of the display device 100 and also can perform an electromagnetic shielding function. The material of the heat dissipation structure 60 may include one or more of foam, copper foil, diamond, silver, or graphene.

The bending pad 70 is disposed between the heat dissipation structure 60 and the second back plate 502. The bending pad 70 is used to bond and support the first and

second back plates

501 and 502. The material of the bending pad 70 may include foam cotton, polyethylene terephthalate, and the like.

Referring to fig. 2, in the present application, the thickness p of the second back plate 502 is smaller than the thickness q of the first back plate 501.

Since the external metal traces in the flexible display panel 40 extend from the first curved portion 402 to the third curved portion 404, and the external metal traces on the third curved portion 404 are arranged more densely, there is a greater risk of breaking the external metal traces under the influence of the bending stress on the third curved portion 404. Therefore, in the present application, the thickness p of the second backplane 502 is set to be smaller than the thickness q of the first backplane 501, so that the second backplane 502 can maintain a lower modulus while supporting the flexible display panel 40, and thus has a better bending performance, and thus the bending stress generated by the second backplane 502 in the third region 5021 can be reduced, so as to reduce the risk of breaking the external metal traces on the third bending portion 404.

The specific size of the thickness p of the second back plate 502 and the specific size of the thickness q of the first back plate 501 may be set according to actual situations, which is not limited in the present application.

With reference to fig. 3, in the present application, the back plate structure 50 further includes a plurality of first openings 50A disposed at intervals and a plurality of second openings 50B disposed at intervals. The first opening 50A is located at the third region 5021 of the second back plate 502. The second opening 50B is located in the second area 5012 of the first back plate 501.

Since the PET is a hard material, compared to a flexible material, the second backplane 502 and the first backplane 501 both have relatively large modulus, so that there is still a large bending stress on the portion of the second backplane 502 in the third area 5021 and the portion of the first backplane 501 in the second area 5012, resulting in the risk of breaking the external metal traces on the first bend 402 and the second bend 404.

In this application, by providing the plurality of first openings 50A in the third area 5021 of the second backplane 502 and the plurality of second openings 50B in the second area 5012 of the first backplane 501, the bending stress generated in the third area 5021 can be concentrated in the plurality of first openings 50A, and the bending stress generated in the second area 5012 can be concentrated in the plurality of second openings 50B, so that the bending stress applied to the second backplane 502 in the third area 5021 and the bending stress applied to the first backplane 501 in the second area 5012 are relieved, and the risk of breaking the external metal traces in the first bending portion 402 and the second bending portion 404 is reduced. Meanwhile, the modulus of the second back plate 502 in the third area 5021 is reduced by the arrangement of the first opening 50A, and the modulus of the first back plate 501 in the second area 5012 is reduced by the arrangement of the second opening 50B, so that the peeling phenomenon between the film layers of the curved area 102 can be improved.

The first opening 50A penetrates through the second backplane 502, and the second opening 50B penetrates through the first backplane 501, so that the stress relief effect on the second backplane 502 and the first backplane 501 can be improved, and the risk of breaking the external metal traces is further reduced.

Therefore, the display device provided by the application has the advantages that the plurality of first openings 50A and the plurality of second openings 50B are arranged on the back plate structure 50, the first openings 50A are located in the third area 5021 of the second back plate 502, the second openings 50B are located in the second area 5012 of the first back plate 501, and further the bending stress borne by the second back plate 502 in the third area 5021 and the bending stress borne by the first back plate 501 in the second area 5012 are relieved, so that the risk of breakage of external metal wires on the first bending portion 402 and the second bending portion 404 is reduced, and the bending performance of the display device 100 is improved.

Referring to fig. 4, in the first embodiment of the second backplane 502 of the backplane structure 50 of the display device 100 provided by the present application before being bonded, the plurality of first openings 50A are arranged in an array. The portion of the second back plate 502 located in the third region 5021 has a bending direction X and a first bending axis M. The bending direction X is perpendicular to the first bending axis M. The display device 100 is formed by bending along a bending direction X and around a first bending axis M. The plurality of first openings 50A includes a plurality of first sub-openings 502A and a plurality of second sub-openings 502B. The plurality of first sub openings 502A are located at both sides of the first bending axis M. The plurality of first sub apertures 502A on one side of the first bending axis M and the plurality of first sub apertures 502A on the other side of the first bending axis M are symmetrical with respect to the first bending axis M. The plurality of second sub openings 502B are arranged side by side along the first bending axis M.

In the present embodiment, the opening areas of the first sub opening 502A and the second sub opening 502B are the same. Specifically, the first sub opening 502A has a first length n in a direction perpendicular to the first bending axis M. The first sub opening 502A has a second length M in a direction parallel to the first bending axis M. The second length m is greater than the first length n. The length of the second sub-aperture 502B in a direction perpendicular to the first bending axis M is s, the length of the second sub-aperture 502B in a direction parallel to the first bending axis M is t, t is greater than s, and s is equal to n, t is equal to M. The specific size of n, m, s, and t may be set according to the size of the second back plate 502 in the third region 5021, which is not limited in the present application.

For the back plate with the existing size, the length of the third region 5021 of the second back plate 502 in the direction parallel to the first bending axis M is greater than the length in the direction perpendicular to the first bending axis M, so that the second back plate 502 has a better bending effect in the third region 5021 by the above arrangement, so as to better relieve the bending stress of the second back plate 502 in the third region 5021, thereby improving the bending performance of the second back plate 502 in the third region 5021, and further improving the overall bending performance of the display device 100.

Referring to fig. 5, the second embodiment of the back plate 502 of the back plate structure 50 of the display device 100 before being bonded differs from the first embodiment in that: in the direction parallel to the first bending axis M, the first sub openings 502A of two adjacent rows are staggered, and the second sub openings 502B are staggered with the first sub openings 502A of one adjacent row.

The above arrangement can disperse the stress generated by the second back plate 502 in the third region 5021, so that the stress is more uniformly concentrated in the plurality of first sub-openings 502A and the plurality of second sub-openings 502B, and the bending performance of the second back plate 502 in the third region 5021 can be improved.

Referring to fig. 6, the third embodiment of the back plate 502 of the back plate structure 50 of the display device 100 before being bonded differs from the second embodiment in that: the second sub opening 502B has a first distance a from the adjacent first sub opening 502A in a direction perpendicular to the first bending axis M. The first distance a is smaller than a distance d between two adjacent first sub openings 502A in a direction perpendicular to the first bending axis M. The distance d between two adjacent first sub-openings 502A increases from the first bending axis M to a direction away from the first bending axis M.

In this embodiment, taking the two sides of the first bending axis M as an example that each includes three rows of the first sub openings 502A, along the direction away from the first bending axis M, the distance d between the first row of the first sub openings 502A and the second row of the first sub openings 502A is denoted as d1, the distance d between the second row of the first sub openings 502A and the third row of the first sub openings 502A is denoted as d2, a < d1< d2, and the difference x1 between a and d1 is equal to the difference x2 between d1 and d2, the specific size of x1 may be set according to the actual situation, and the present application does not limit this.

It can be understood that, along the bending direction X of the second back plate 502 in the third region 5021, the curvature of the second back plate 502 at different positions of the third region 5021 is different, so that there is a difference in the magnitude of the stress generated by the second back plate 502 at the position close to the first bending axis M and the position far away from the first bending axis M on the third region 5021.

Specifically, from the first bending axis M to a direction away from the first bending axis M, the curvature of the second back plate 502 in the third region 5021 gradually decreases, thereby causing the stress generated by the second back plate 502 in the third region 5021 to gradually decrease. Therefore, in the second back plate 502 of this embodiment, the line spacing between the first openings 50A is sequentially increased from the first bending axis M to the direction away from the first bending axis M, so as to match the distribution of the stress of the second back plate 502 at the third area 5021 gradually from the first bending axis M to the direction away from the first bending axis M, thereby facilitating the improvement of the uniformity of the stress borne by the second back plate 502 at the third area 5021, further reducing the risk of breaking the external metal wires caused by stress accumulation, and further improving the bending performance of the display device 100.

Referring to fig. 7, the fourth embodiment of the back plate 502 of the back plate structure 50 of the display device 100 before being bonded differs from the third embodiment in that: the opening area of each second sub-opening 502B is larger than the opening area of each first sub-opening 502A. Specifically, in a direction parallel to the first bending axis M, the length t of the second sub opening 502B is equal to the second length M. The length s of the second sub opening 502B in a direction perpendicular to the first bending axis M is greater than the first length n.

The specific size of n, m, s, and t may be set according to the size of the second back plate 502 in the third region 5021, which is not limited in the present application.

Because the stress generated at the position of the second back plate 502 corresponding to the first bending axis M is the largest, and the stress near the first bending axis M is much larger than the stress far away from the first bending axis M, the risk of the external metal wires breaking near the first bending axis M is much larger than the risk of the external metal wires breaking far away from the first bending axis M. Therefore, in the second back plate 502 of this embodiment, the opening area of each second sub-opening 502B is larger than the opening area of each first sub-opening 502A by increasing the opening area of the second sub-opening 502B, so that the bending performance of the second back plate 502 at the position close to the first bending axis M can be further improved, and the risk of breaking the external metal traces can be greatly reduced.

Referring to fig. 8, the difference between the fifth embodiment and the second embodiment of the second backplane 502 of the backplane structure 50 of the display device 100 before being bonded is as follows: the length s of the second sub opening 502B in a direction perpendicular to the first bending axis M is greater than the first length n. The first length n decreases progressively from the first bending axis M to a direction away from the first bending axis M.

In the present embodiment, taking the example that both sides of the first bending axis M include three rows of the first sub apertures 502A, the first length n of the first row of the first sub apertures 502A is n1, the first length n of the second row of the first sub apertures 502A is n2, the first length n of the third row of the first sub apertures 502A is n3, s > n1> n2> n3, the difference y1 between s and n1, the difference y2 between n1 and n2, and the difference y2 between n2 and n3 are all equal and are all between 0.75 mm and 0.95 mm. In some embodiments, y1 may be specifically 0.75 mm, 0.80 mm, 0.85 mm, 0.90 mm, or 0.95 mm, and the specific size of y1 may be set according to practical situations, which is not limited in this application.

Specifically, from the first bending axis M to a direction away from the first bending axis M, the curvature of the second back plate 502 in the third region 5021 gradually decreases, thereby causing the stress generated by the second back plate 502 in the third region 5021 to gradually decrease. Therefore, in the second back plate 502 of this embodiment, from the first bending axis M to the direction away from the first bending axis M, by sequentially reducing the length of the first opening 50A in the direction perpendicular to the first bending axis M, the distribution of the stress of the second back plate 502 at the third area 5021 is gradually reduced from the first bending axis M to the direction away from the first bending axis M, which is favorable for improving the uniformity of the stress borne by the second back plate 502 at the third area 5021, so as to further reduce the risk of breaking the external metal wire caused by stress accumulation, and thus the bending performance of the display device 100 can be further improved.

Referring to fig. 9, in a top view structure diagram of the first backplane 501 of the backplane structure 50 of the display device 100 provided in the present application before being bonded, the plurality of second openings 50B are arranged in an array. The portion of the first back plate 501 located in the second area 5012 has a bending direction X and a second bending axis N. The plurality of second openings 50B includes a plurality of third sub openings 501A and a plurality of fourth sub openings 501B. The plurality of third sub openings 501A are located at both sides of the second bending axis N. The plurality of third sub apertures 501A at one side of the second bending axis N and the plurality of third sub apertures 501A at the other side of the second bending axis N are symmetrical about the second bending axis N. The plurality of third sub openings 501A are arranged side by side in a plurality of rows along the second bending axis N.

It should be noted that the structure of the first backplane 501 in the second area 5012 in this application is the same as the structure of the second backplane 502 in the third area 5021 in the foregoing embodiments. Therefore, the structure of the first back plate 501 in the second area 5012 can refer to the description of the structure of the second back plate 502 in the foregoing embodiment, and is not described herein again.

The foregoing provides a detailed description of embodiments of the present application, and the principles and embodiments of the present application have been described herein using specific examples, which are presented solely to aid in the understanding of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A display device, it includes the flat area and sets up in the curved surface district of one side of the said flat area, characterized by that, the said display device also includes:

2. The display device according to claim 1, wherein the first opening extends through the second back plate.

3. The display device according to claim 2, wherein a portion of the second back plate located in the third area has a first bending axis, and the plurality of first openings includes a plurality of first sub-openings located at two sides of the first bending axis.

4. The display device according to claim 3, wherein the plurality of first sub-openings on one side of the first bending axis are symmetrical to the plurality of first sub-openings on the other side of the first bending axis with respect to the first bending axis.

5. The display device according to claim 3, wherein two adjacent rows of the first sub-openings on one side of the first bending axis are staggered in a direction parallel to the first bending axis.

6. The display device according to claim 3, wherein a distance between two adjacent first sub-openings increases from the first bending axis to a direction away from the first bending axis.

7. The display device according to claim 3, wherein the first sub-opening has a first length in a direction perpendicular to the first bending axis, the first length decreasing from the first bending axis to a direction away from the first bending axis.

8. The display device according to claim 3, wherein the first sub-opening has a first length in a direction perpendicular to the first bending axis, and the first sub-opening has a second length in a direction parallel to the first bending axis, the second length being greater than the first length.

9. The display device according to any one of claims 3 to 8, wherein the plurality of first openings further includes a plurality of second sub openings, the plurality of second sub openings are arranged side by side along the first bending axis, and an opening area of each of the second sub openings is larger than an opening area of each of the first sub openings.

10. The display device of claim 1, wherein the backplane structure further comprises a plurality of spaced apart second openings, the second openings being located in the second region of the first backplane.

11. The display device according to claim 10, wherein a portion of the first back plate located in the second region has a second bending axis, the second openings include a plurality of third sub-openings, and the third sub-openings are located on two sides of the second bending axis.

12. The display device according to claim 1, wherein a thickness of the second back plate is smaller than a thickness of the first back plate.