CN114863810A

CN114863810A - Foldable display device

Info

Publication number: CN114863810A
Application number: CN202210409916.7A
Authority: CN
Inventors: 石志义; 毕炜
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-08-05
Anticipated expiration: 2042-04-19
Also published as: CN114863810B

Abstract

The application discloses a foldable display device, which is provided with a bending area, a first flat area and a second flat area, and comprises a foldable body, a telescopic switching mechanism and a foldable display panel, wherein the telescopic switching mechanism and the foldable display panel are sequentially positioned in the foldable body; the telescopic switching mechanism comprises a switching circuit board, and a containing structure and a rolling structure which are positioned in the bending area; the containing structure is provided with a containing cavity, a first outlet and a second outlet which are communicated with the containing cavity; the switching circuit board is folded and coiled in the accommodating cavity and comprises a first end and a second end which respectively extend to preset positions of the first flat area and the second flat area from the first outlet and the second outlet; the receiving structure is coaxially and fixedly connected with the rolling structure and is rotationally connected with the foldable machine body; when the adapter circuit board in the accommodating cavity is respectively stretched out from the first outlet and the second outlet, the rolling structure provides a furled elastic pulling force for the adapter circuit board. This application can reduce the fracture risk of the switching circuit board in kink district.

Description

Foldable display device

Technical Field

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

Background

At present, since an OLED (Organic Light Emitting Diode) screen has a flexible performance, a foldable mobile phone with a flexible OLED becomes one of the development directions of a plurality of mobile phone manufacturers and panel manufacturers.

The middle frame structure of a foldable mobile phone is generally divided into two parts, and a main board, an auxiliary board, a battery and other electronic devices arranged in the two parts of the middle frame structure need to be communicated through a Flexible Printed Circuit (FPC), so that the FPC needs to be connected to pass through a rotating shaft structure of a bending area. Because the structure in the district of buckling is comparatively compact, folding cell-phone in-process of buckling, switching FPC can receive to drag and warp, after buckling through certain number of times, switching FPC has cracked risk. Moreover, the position of the switching FPC in the rotating shaft structure is uncertain, the length design is difficult, and floating or wrinkling of the switching FPC in the bending process can not only cause scraping abnormal sound, but also even push the bending area of the OLED screen, so that certain failure risk is caused.

Disclosure of Invention

The application provides a collapsible display device can realize the length self-adaptation of the switching circuit board in the district of buckling and change, avoids the switching circuit board in the district of buckling to float or the fold to reduce the fracture risk of switching circuit board and reduce collapsible display panel's inefficacy risk.

The application provides a foldable display device, which is provided with a bending area, a first flat area and a second flat area, wherein the first flat area and the second flat area are positioned on two sides of the bending area; the foldable display device comprises a foldable body positioned in the first flat area, the bending area and the second flat area, and a telescopic adapter mechanism and a foldable display panel which are sequentially arranged in the foldable body;

the telescopic switching mechanism comprises a switching circuit board, and a receiving structure and a rolling structure which are positioned in the bending area; the containing structure is internally provided with a containing cavity, a first outlet and a second outlet which are communicated with the containing cavity; the adapter circuit board is folded and coiled in the accommodating cavity and comprises a first end and a second end which respectively extend out of the first outlet and the second outlet; the first end and the second end respectively extend to preset positions of the first flat area and the second flat area and are used for connecting two parts of electronic devices which are installed in the foldable body and are respectively positioned in the first flat area and the second flat area in series when the foldable body is installed;

the accommodating structure is coaxially and fixedly connected with the rolling structure and is rotatably connected with the foldable machine body; when the adapter circuit board in the accommodating cavity is respectively extended out from the first outlet and the second outlet, the rolling structure provides a furled elastic pulling force for the adapter circuit board.

Optionally, the retractable switching mechanism further comprises a connecting shaft which penetrates through the receiving structure and the rolling structure, is fixedly connected with the receiving structure and the rolling structure, and is rotatably connected with the foldable body; the containing cavity is arranged around the connecting shaft;

the bending area and the connecting shaft extend along a first direction, and the rolling structure is at least located on one side of the accommodating structure in the first direction.

Optionally, the winding structure comprises a clockwork spring wound on the connecting shaft and a housing covering the outer side of the clockwork spring and fixedly connected with the connecting shaft; one end of the clockwork spring is fixedly connected with the connecting shaft, and the other end of the clockwork spring is fixedly connected with the shell.

Optionally, the patch circuit board located in the receiving cavity comprises a stretchable portion and a non-stretchable portion connected to each other; the side of the stretchable portion away from the non-stretchable portion extends from the first outlet and the second outlet, and the non-stretchable portion is at least partially fixedly connected with the receiving structure.

Optionally, the accommodating structure further comprises a winding column arranged in the accommodating cavity, and the adapting circuit board located in the accommodating cavity is folded around the winding column and is arranged in a spiral manner along the extending direction of the accommodating cavity.

Optionally, the foldable body comprises the first body part located in the first flat area, a second body part located in the second flat area, and a connecting mechanism located in the bending area and connected with the first body part and the second body part; the telescopic switching mechanism is positioned between the connecting mechanism and the foldable display panel;

the connecting mechanism comprises a first accommodating groove, the accommodating structure and the rolling structure are located in the first accommodating groove, and the connecting shaft is rotatably connected with the connecting mechanism.

Optionally, the connecting mechanism comprises a rotating shaft cover and a rotating shaft structure; the first accommodating groove is formed in the rotating shaft cover, and a second accommodating groove and a third accommodating groove which are positioned on two sides of the first accommodating groove in the first direction are further formed in the rotating shaft cover; the rotating shaft structure is positioned in the second accommodating groove and the third accommodating groove and is respectively connected with the first fuselage part and the second fuselage part;

the rotating shaft cover comprises a first supporting plate and a second supporting plate, the first supporting plate is located between the first accommodating groove and the second accommodating groove, and the second supporting plate is located between the first accommodating groove and the third accommodating groove; and two ends of the connecting shaft are respectively connected with the first supporting plate and the second supporting plate in a rotating manner.

Optionally, the first fuselage section and the second fuselage section extend towards the bending zone portion; when the foldable display device is in a flat state, the first body part and the second body part are spliced in the bending area and are formed with a fourth accommodating groove located in the bending area, and the rotating shaft cover is located in the fourth accommodating groove.

Optionally, the first body part comprises a first outer shell and a first middle frame located in the first outer shell, and the second body part comprises a second outer shell and a second middle frame located in the second outer shell; the fourth accommodating groove is formed on the first middle frame and the second middle frame which are positioned in the bending area;

the rotating shaft structure is respectively connected with the first middle frame and the second middle frame; the first end and the second end of the adapter circuit board extend to preset positions in the first middle frame and the second middle frame respectively.

Optionally, the foldable body located in the first flat area and the foldable body located in the second flat area are respectively provided with at least one limiting column at a position close to the bending area;

the switching circuit board located in the first flat area and the second flat area is respectively provided with at least one limiting groove which is in one-to-one correspondence with the at least one limiting column, and the limiting columns are located in the corresponding limiting grooves.

According to the foldable display device, the telescopic switching mechanism is arranged in the bending area, part of the switching circuit board is folded and coiled in the containing cavity of the containing structure, and under the cooperation of the coiling structure, the switching circuit board in the containing cavity can be stretched along with the folding of the foldable display device and coiled along with the unfolding of the foldable device; on the one hand, the length self-adaptation of the switching circuit board in the bending area can be changed, the fracture of the switching circuit board in the bending area caused by pulling and bending deformation is reduced, the risk of poor contact and even failure is avoided, and on the other hand, the switching circuit board in the bending area can be prevented from floating or folding, and the failure risk of the foldable display panel is reduced.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is an exploded view of a foldable display device provided in an embodiment of the present application.

Fig. 2 is a partial structural schematic diagram of a foldable display device provided in an embodiment of the present application in a folded state.

Fig. 3 is a schematic structural diagram of a connection mechanism and a retractable adapter mechanism in a foldable display device according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a retractable adapter according to an embodiment of the present application.

Fig. 5 is a side sectional view of the receiving structure and the adapting circuit board according to the embodiment of the present application.

Fig. 6 is a side sectional view of a rolling structure and a receiving structure provided in an embodiment of the present application.

Fig. 7 is a schematic structural view of a limiting column and a limiting groove provided in the embodiment of the present application.

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.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

As shown in fig. 1 to 7, an embodiment of the present application provides a foldable display device 1, and the foldable display device 1 has a bending region 2 and a first flat region 3 and a second flat region 4 located at both sides of the bending region 2. The foldable display device 1 includes a foldable body 5 located in a first flat region 3, a bending region 2 and a second flat region 4, and a telescopic adaptor 6 and a foldable display panel 7 sequentially installed in the foldable body 5.

As shown in fig. 1 to 5, the retractable adapting mechanism 6 includes an adapting circuit board 8, and a receiving structure 9 and a rolling structure 10 located in the bending area 2; the containing structure 9 is provided with a containing cavity 11, a first outlet 12 and a second outlet 13 which are communicated with the containing cavity 11; the adapting circuit board 8 is coiled in the accommodating cavity 11 and comprises a first end 14 and a second end 15 which respectively extend from the first outlet 12 and the second outlet 13; the first end 14 and the second end 15 extend to preset positions of the first flat area 3 and the second flat area 4 respectively and are used for connecting two parts of electronic devices which are installed in the foldable body 5 and are respectively positioned in the first flat area 3 and the second flat area 4 in series when the foldable body is installed; the receiving structure 9 is coaxially and fixedly connected with the rolling structure 10 and is rotatably connected with the foldable machine body 5; when the relay circuit board 8 in the receiving cavity 11 is respectively extended from the first outlet 12 and the second outlet 13, the rolling structure 10 provides a furled elastic pulling force for the relay circuit board 8.

Specifically, the relay circuit board 8 is a flexible circuit board, such as an FPC; two-part electronic devices mounted in the foldable body 5 and respectively located in the first flat region 3 and the second flat region (i.e., located on both sides of the bending region 2) 4 include a main board, a sub-board, a battery, and the like, without being limited to the ones listed; the adapter circuit board 8 is used for realizing the electric signal communication between the electronic devices on two sides of the bending area 2.

It should be noted that, during the folding and unfolding process of the foldable display device 1, the positions of the first end 14 and the second end 15 of the adapting circuit board 8 are always kept unchanged, and the adapting circuit board 8 located in the bending area 2 can be adaptively changed in length by stretching and rolling, so as to reduce the risk of breaking the adapting circuit board 8.

Specifically, when the foldable display device 1 is folded, the foldable body 5 located in the first flat area 3 and the foldable body 5 located in the first flat area 3 are folded, and in the process, a part of the adapting circuit board 8 located in the receiving cavity 11 of the receiving structure 9 is pulled out from the first outlet 12 and the second outlet 13, so that the length of the adapting circuit board 8 in the bending area 2 is increased, and meanwhile, the rolling structure 10 stores energy and provides a furled elastic tensile force for the adapting circuit board 8; when the foldable display device 1 is unfolded, the adapting circuit board 8 stretched out of the receiving cavity 11 will be automatically rolled into the receiving cavity under the action of the elastic tension provided by the rolling structure 10, so that the length of the adapting circuit board 8 in the bending area 2 is reduced and the original length is known to be recovered.

It is understood that the original length refers to the length of the relay circuit board 8 when the foldable display device 1 is in the unfolded state; the length of the relay circuit board 8 refers to the length of the relay circuit board 8 outside the receiving cavity 11 in the bending region 2.

Specifically, as shown in fig. 3 and 4, the retractable adapting mechanism 6 further includes a connecting shaft 16 penetrating through the receiving structure 9 and the rolling structure 10, fixedly connected with the receiving structure 9 and the rolling structure 10, and rotatably connected with the foldable body 5; both the bending zone 2 and the connecting shaft 16 extend in a first direction.

Specifically, as shown in fig. 5, the housing chamber 11 is provided around the connecting shaft 16. Because the size of the bending area 2 is smaller, the change value of the length of the adapting circuit board 8 in the bending area 2 is not too large in the process of folding and unfolding the foldable display device 1, and the adapting circuit board 8 is coiled into the storage cavity 11 for one circle after being folded in half, namely the storage cavity 11 is coiled around the connecting shaft 16 for one circle; of course, according to practical circumstances, the adapting circuit board 8 may be folded into two in the receiving cavity 11 and then coiled a plurality of times, and correspondingly, the receiving cavity 11 may be arranged around the connecting shaft 16 a plurality of times.

Specifically, the relay circuit board 8 located in the receiving cavity 11 is pre-bent according to the shape of the receiving cavity 11 before being mounted in the receiving cavity 11, so that the two folded relay circuit boards 8 respectively adhere to the upper wall and the lower wall of the receiving cavity 11. This design can avoid the direct laminating setting of two parts switching circuit board 8 after the fifty percent discount to avoid the problem of switching circuit board 8 wearing and tearing.

Specifically, as shown in fig. 5, the relay circuit board 8 located in the receiving cavity 11 includes a stretchable portion 17 and a non-stretchable portion 18 connected to each other; the stretchable portion 17 extends from the first outlet 12 and the second outlet 13 on a side thereof remote from the non-stretchable portion 18, and the non-stretchable portion 18 is at least partially fixedly attached to the receiving structure 9. The embodiment of the application divides the adapter circuit board 8 folded in half in the containing cavity 11 into a stretchable part 17 which can be stretched out of the containing cavity 11 and a non-stretchable part 18 which cannot be stretched out of the containing cavity 11; wherein the non-stretching portion 18 may be fixed to the wall of the receiving chamber 11 by foam 19. The application does not limit the use area and the use position of the foam rubber 19, and the foam rubber can be fixed only near the folding position of the adapter circuit board 8 in order to save the material cost. Of course, the present application is not limited to the specific fixing manner of the non-stretching portion 18 of the relay circuit board 8 in the receiving cavity 11.

It can be understood that, in the folding process of the foldable display device 1, after the two ends of the adapting circuit board 8 in the bending region 2 are pulled, since the non-stretching portion 18 of the adapting circuit board 8 in the receiving cavity 11 is fixed on the wall of the receiving cavity 11, the adapting circuit board 8 cannot slide in the receiving cavity 11, and then a torque is generated at the position, so that the receiving structure 9 rotates around the axis of the connecting shaft 16; due to the change in the axial center position of the relay circuit board 8 with respect to the connecting shaft 16, the relay circuit board 8 is loosened and pulled out from the first outlet 12 and the second outlet 13.

Specifically, as shown in fig. 5, the receiving structure 9 further includes a winding post 20 disposed in the receiving cavity 11, and the relay circuit board 8 located in the receiving cavity 11 is folded around the winding post 20 and is coiled along the extending direction of the receiving cavity 11. The housing chamber 11 comprises a starting end and a terminal end, wherein the terminal end is adjacent to the first outlet 12 and the second outlet 13 in the extension direction of the housing chamber 11; the winding post 20 is disposed near the starting end of the housing chamber 11. In the embodiment of the present application, the main function of the winding post 20 is to avoid the failure of the circuit due to the broken circuit caused by the over-folded position of the adapting circuit board 8 with too small bending radius.

Specifically, as shown in fig. 5, the first outlet 12 and the second outlet 13 of the receiving structure 9 are communicated with each other, and a limit baffle 21 is disposed between the first outlet 12 and the second outlet 13. The first end 14 of the adapting circuit board 8 extends from the first outlet 12 to the first flat area 3, and the second end 15 extends from the receiving cavity 11 through the first outlet 12, extends to the second outlet 13 through the lower part of the limit baffle 21, and extends from the second outlet 13 to the second flat area 4. In one embodiment, the first outlet 12 and the second outlet 13 are disposed close to the foldable display panel 7 with a distance therebetween smaller than the diameter of the receiving structure 9. This arrangement can prevent the relay circuit board 8 from being excessively bent at the first outlet 12 and the second outlet 13 to be broken.

Specifically, the rolling structure 10 is at least located on one side of the receiving structure 9 in the first direction. In one embodiment, as shown in fig. 1 and 4, the number of the rolling structures 10 is 2, and two rolling structures 10 are symmetrically disposed on two sides of the receiving structure 9 in the first direction. On one hand, the design can realize the independence and the maximization of space utilization of the accommodating structure (moving part) 9 and the rolling structure (energy storage part) 10; on the other hand, the force applied to the accommodating structure 9 is uniform, so that the accommodating structure 9 can rotate more smoothly, and the transfer circuit board 8 can be prevented from being damaged in the rolling process.

Specifically, as shown in fig. 6, the winding structure 10 includes a spiral spring 22 wound around the connecting shaft 16 and a housing 23 covering the spiral spring 22 and fixedly connected to the connecting shaft 16; one end of the clockwork spring 22 is fixedly connected to the connecting shaft 16, and the other end is fixedly connected to the housing 23. In one embodiment, the two ends of the spring 22 are fixedly connected to the connecting shaft 16 and the housing 23, respectively, by means of an insert.

It can be understood that the housing 23 of the storage structure 9, the rolling structure 10, and the connecting shaft 16 rotate synchronously during the folding and unfolding of the foldable display device 1.

Specifically, during the folding process of the foldable display device 1, the housing 23 of the receiving structure 9, the housing 23 of the rolling structure 10, and the connecting shaft 16 rotate along the second direction, and during the unfolding process of the foldable display device 1, the receiving structure 9, the housing 23 of the rolling structure 10, and the connecting shaft 16 rotate along the third direction; the second direction is opposite to the third direction, for example, the second direction is clockwise and the third direction is counterclockwise.

Specifically, during the folding process of the foldable display device 1, the accommodating structure 9, the housing 23 of the rolling structure 10, and the connecting shaft 16 rotate in the second direction, so that the adapting circuit board 8 is partially extended out of the accommodating cavity 11, and the clockwork spring 22 stores energy under the action of the twisting force; during the unfolding of the foldable display device 1, the clockwork spring 22 gradually releases energy, so that the connecting shaft 16 is reversely rotated, and the receiving structure 9 is further caused to rotate to wind the stretched adapter circuit board 8 in the receiving cavity 11. It is understood that the process of releasing energy from the clockwork spring 22 is the process of providing a closed elastic tension to the relay circuit board 8.

Specifically, as shown in fig. 1, the foldable body 5 includes a first body portion 24 located in the first flat region 3 and extending partially toward the bending region 2, a second body portion 25 located in the second flat region 4 and extending partially toward the bending region 2, and a connecting mechanism 26 located in the bending region 2 and connected to the first body portion 24 and the second body portion 25; the telescopic adapter mechanism 6 is positioned between the connecting mechanism 26 and the foldable display panel 7; the connecting mechanism 26 comprises a first accommodating groove 27, the accommodating structure 9 and the rolling structure 10 are positioned in the first accommodating groove 27, and the connecting shaft 16 is rotatably connected with the connecting mechanism 26. Specifically, the opening of the first receiving groove 27 is disposed near the foldable display panel 7.

Specifically, as shown in fig. 1, the foldable display device 1 further includes a cover plate 28 disposed corresponding to the first receiving groove 27, the cover plate 28 is disposed between the retractable adapting mechanism 6 and the foldable display panel 7, and is used for shielding the retractable adapting mechanism 6 to prevent the adapting circuit board 8 of the bending area 2 from being exposed, and on the other hand, the surface of the foldable body 5 can be kept flat, so as to facilitate attaching the foldable display panel 7.

In one embodiment, the cover plate 28 includes two sub-cover plates that are axisymmetric along the first direction; a gap is formed between the two sub cover plates. When the foldable display device 1 is folded, the two sub-cover plates can be folded in half, and when the foldable display device 1 is folded, the two sub-cover plates are unfolded at ordinary times.

Specifically, as shown in fig. 1 and 3, the connecting mechanism 26 includes a rotating shaft cover 29 and a rotating shaft structure 30; the first receiving groove 27 is arranged in the rotating shaft cover 29, and the rotating shaft cover 29 is further provided with a second receiving groove 31 and a third receiving groove 32 which are positioned at two sides of the first receiving groove 27 in the first direction; the rotating shaft structure 30 is positioned in the second accommodating groove 31 and the third accommodating groove 32 and connected with the first body part 24 and the second body part 25; the shaft cover 29 includes a first support plate 33 between the first receiving groove 27 and the second receiving groove 31 and a second support plate 34 between the first receiving groove 27 and the third receiving groove 32; both ends of the connecting shaft 16 are rotatably connected to the first support plate 33 and the second support plate 34, respectively. The embodiment of the application installs the accommodating structure 9 and the rolling structure 10 of the retractable adapting mechanism 6 by designing the first accommodating groove 27 avoiding the rotating shaft structure 30 in the rotating shaft cover 29, provides a limiting structure for the position of the adapting circuit board 8 in the rotating shaft cover 29, and can reduce the design difficulty of arranging the adapting circuit board 8 between the rotating shaft cover 29 and the rotating shaft structure 30.

Specifically, as shown in fig. 1 and 2, the first fuselage section 24 and the second fuselage section 25 extend partially toward the bending zone 2; when the foldable display device 1 is in the unfolded state, the first body part 24 and the second body part 25 are spliced in the bending area 2 and form a fourth accommodating groove 35 located in the bending area 2, and the rotating shaft cover 29 is located in the fourth accommodating groove 35; when the foldable display device 1 is in the folded state, the first body portion 24 and the second body portion 25 located in the bending region 2 are located above the pivot cover 29, forming a groove body that is turned upside down above the pivot cover 29.

Specifically, as shown in fig. 1, the first body section 24 includes a first outer shell 36 and a first middle frame 37 located in the first outer shell 36, and the second body section 25 includes a second outer shell 38 and a second middle frame 39 located in the second outer shell 38; the fourth receiving groove 35 is formed on the first middle frame 37 and the second middle frame 39 in the bending region 2; the rotating shaft structure 30 is respectively connected with the first middle frame 37 and the second middle frame 39; the first end 14 and the second end 15 of the relay circuit board 8 extend to predetermined positions in the first middle frame 37 and the second middle frame 39, respectively.

Specifically, as shown in fig. 1 and 3, the rotating shaft structure 30 includes a rotating portion 40 extending toward the first middle frame 37 and the second middle frame 39 and fixedly connected to the first middle frame 37 and the second middle frame 39, respectively, and a rotating shaft 41 located in the second receiving groove 31 and the third receiving groove 32. The connecting portion can rotate around the rotating shaft 41, and the first and second middle frames 37 and 39 perform folding and unfolding functions with the rotation of the rotating portion 40. In the folding process of the foldable display device 1, the user applies acting force to the first middle frame 37 and the second middle frame 39, and the first middle frame 37 and the second middle frame 39 transmit the acting force to the rotating part 40 to realize the folding function of the foldable display device 1; meanwhile, the first middle frame 37 and the second middle frame 39 transmit the acting force to the adapting circuit board 8, so that the stretching and rolling functions of the adapting circuit board 8 are realized.

It should be noted that, the embodiment of the present application does not limit the specific structure of the rotating shaft structure 30, and the rotating shaft structure 30 shown in the drawings is a schematic drawing and does not represent a real structure.

Specifically, as shown in fig. 1, in order to maintain the flatness of the first and second middle frames 37 and 39 on the side close to the foldable display panel 7, the first and second middle frames 37 and 39 are provided with first sunken structures 42 corresponding to the rotation portions 40 for mounting the rotation portions 40.

Specifically, as shown in fig. 1, 3 and 7, at least one limiting column 43 is respectively disposed at a position close to the bending region 2 of the foldable body 5 located in the first flat region 3 and the second flat region 4; the adapting circuit board 8 located in the first flat area 3 and the second flat area 4 are respectively provided with at least one limiting groove 44 which is in one-to-one correspondence with at least one limiting post 43, and the limiting posts 43 are located in the corresponding limiting grooves 44. The limiting columns 43 are arranged to limit the extension and contraction states of the adapting circuit board 8 in the bending area 2, specifically in the first receiving groove 27 of the shaft cover 29; meanwhile, stress on two sides of the bending area 2 is transmitted to the position of the limiting column 43 instead of being directly acted on the first end 14 and the second end 15 of the switching circuit board 8, and the situation that the first end 14 and the second end 15 are loosened and lose efficacy due to long-term stress and connection between electronic devices such as a main board, an auxiliary board and a battery is avoided.

In one embodiment, the position-limiting columns 43 are arranged at the positions of the first middle frame 37 and the second middle frame 39 close to the bending area 2; the cover plate 28 extends toward the first and second middle frames 37 and 39 at both sides thereof, and is connected to the first and second middle frames 37 and 39. In order to maintain the flatness of the first middle frame 37 and the second middle frame 39 close to one side of the foldable display panel 7, a second sunken structure 45 corresponding to the cover plate 28 is further arranged on the first middle frame 37 and the second middle frame 39; and the restraint posts 43 are disposed in the second sunken structure 45.

In one embodiment, as shown in fig. 7, two limiting posts 43 are disposed on the first middle frame 37 along the first direction, and two corresponding limiting grooves 44 are disposed on two sides of the adapting circuit board 8 in the first flat area 3, and are disposed in one-to-one correspondence with the two limiting posts 43 on the first middle frame 37; two limiting columns 43 symmetrically arranged with the two limiting columns 43 on the first middle frame 37 are arranged on the second middle frame 39, and two limiting grooves 44 arranged in one-to-one correspondence with the two limiting columns 43 on the second middle frame 39 are correspondingly arranged on two sides of the adapting circuit board 8 located in the second flat area 4. The design can make the adapting circuit board 8 at the position of the limiting column 43 uniformly stressed.

It is understood that the limiting post and the limiting groove form a limiting structure, and in other embodiments, the limiting structure may also be in other forms, and is not limited to the limiting post and the limiting groove described in the embodiments of the present application.

Specifically, the foldable display panel 7 includes a flexible OLED display panel, but is not limited thereto.

In the embodiment of the present application, the retractable adapting mechanism 6 is disposed in the bending area 2, and a portion of the adapting circuit board 8 is folded and spirally wound in the receiving cavity 11 of the receiving structure 9, and under the cooperation of the winding structure 10, the adapting circuit board 8 in the receiving cavity 11 can be stretched along with the folding of the foldable display device 1, and can be wound along with the unfolding of the foldable display device 1; on the one hand, can realize the length self-adaptation of the switching circuit board 8 of bending zone 2 and change, reduce the switching circuit board 8 of bending zone 2 because of dragging and buckle the fracture that the deformation leads to avoid contact failure risk even, on the other hand, can avoid the switching circuit board 8 of bending zone 2 to float or the fold, thereby reduces collapsible display panel 7's inefficacy risk.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The foregoing detailed description is directed to a foldable display device provided in an embodiment of the present application, and specific examples are applied herein to illustrate the principles and implementations of the present application, and the above description of the embodiments is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A foldable display device is characterized by comprising a bending area, a first flat area and a second flat area, wherein the first flat area and the second flat area are positioned on two sides of the bending area; the foldable display device comprises a foldable body positioned in the first flat area, the bending area and the second flat area, and a telescopic adapter mechanism and a foldable display panel which are sequentially arranged in the foldable body;

2. The foldable display device of claim 1, wherein the retractable switching mechanism further comprises a connecting shaft passing through the receiving structure and the rolling structure, fixedly connected with the receiving structure and the rolling structure, and rotatably connected with the foldable body; the containing cavity is arranged around the connecting shaft;

3. The foldable display device of claim 2, wherein the winding structure comprises a clockwork spring wound around the connecting shaft and a housing covering the clockwork spring and fixedly connected to the connecting shaft; one end of the clockwork spring is fixedly connected with the connecting shaft, and the other end of the clockwork spring is fixedly connected with the shell.

4. The foldable display device of claim 2, wherein the adapting circuit board located in the receiving cavity comprises a stretchable portion and a non-stretchable portion connected to each other; the side of the stretchable portion away from the non-stretchable portion extends from the first outlet and the second outlet, and the non-stretchable portion is at least partially fixedly connected with the receiving structure.

5. The foldable display device of claim 4, wherein the receiving structure further comprises a winding post disposed in the receiving cavity, and the adapting circuit board located in the receiving cavity is folded around the winding post and is coiled along an extending direction of the receiving cavity.

6. The foldable display device of claim 2, wherein the foldable body comprises the first body section at the first flat area, a second body section at the second flat area, and a connection mechanism at the bend area and connecting the first body section and the second body section; the telescopic switching mechanism is positioned between the connecting mechanism and the foldable display panel;

7. The foldable display device of claim 6, wherein said connection mechanism comprises a swivel cover and a swivel structure; the first accommodating groove is formed in the rotating shaft cover, and a second accommodating groove and a third accommodating groove which are positioned on two sides of the first accommodating groove in the first direction are further formed in the rotating shaft cover; the rotating shaft structure is positioned in the second accommodating groove and the third accommodating groove and is respectively connected with the first fuselage part and the second fuselage part;

8. The foldable display device of claim 7, wherein the first body section and the second body section extend towards the bend zone portion; when the foldable display device is in a flat state, the first body part and the second body part are spliced in the bending area and are formed with a fourth accommodating groove located in the bending area, and the rotating shaft cover is located in the fourth accommodating groove.

9. The foldable display device of claim 8, wherein the first body section comprises a first housing and a first middle frame in the first housing, and the second body section comprises a second housing and a second middle frame in the second housing; the fourth accommodating groove is formed on the first middle frame and the second middle frame which are positioned in the bending area;

10. The foldable display device of any one of claims 1 to 9, wherein the foldable body in the first flat region and the foldable body in the second flat region are respectively provided with at least one position-limiting pillar at a position close to the bending region;