CN115731803A

CN115731803A - Flexible display panel and display device

Info

Publication number: CN115731803A
Application number: CN202211493896.2A
Authority: CN
Inventors: 沈冲; 周军; 徐古胜; 苏灵艳; 刘明星; 朱修剑
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd; Hefei Visionox Technology Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd; Hefei Visionox Technology Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-03-03

Abstract

The application provides a flexible display panel and a display device, which comprise a flexible screen body, a first non-bending part, a first bending part, a second non-bending part and a third non-bending part, wherein the display surface and the back surface are opposite to each other; the supporting piece is arranged on the back surface of the flexible screen body and provided with a first surface close to the flexible screen body and a second surface opposite to the first surface, and the supporting piece comprises a first supporting piece, a second supporting piece, a third supporting piece, a fourth supporting piece and a fifth supporting piece; the second supporting piece and the third supporting piece can be bent towards opposite directions relative to the first supporting piece; the second support part is provided with a first opening corresponding to the position of the first bending part, which is close to the initial bending part of the first non-bending part, and/or the thickness of at least part of the position, different from the first opening, of the second support part is smaller than that of the first support part. The display panel can improve the problem of stress concentration in the bending process and reduce the probability of inverted arch failure.

Description

Flexible display panel and display device

Technical Field

The invention relates to the technical field of display, in particular to a flexible display panel and a display device.

Background

With the continuous development of display technology in recent years, the flexible OLED display has more and more diversified forms, and the flexible display device is more and more favored by the market.

The flexible display device comprises a flexible display panel, the form of the flexible display panel is not limited to simple inward folding or outward folding, double inward folding or double outward folding or inward folding and outward folding combination is realized at present, the form of the flexible display panel can be 'e' or 'Z', a larger display area can be obtained under the unfolding state, the film watching effect is improved, meanwhile, the flexible display device also can obtain a smaller volume when being folded, and a user can easily store and carry the flexible display panel.

However, in the double-in-folded or double-out-folded configuration of the flexible display, the central non-bending portion of the flexible display panel may be subjected to two opposite common tensile or compressive stresses, so that the central non-bending portion is prone to bounce and arch failure. Under the inward-folding and outward-folding combined state of the flexible display panel, stress concentration can be caused at the connecting parts of the center of the corresponding flexible display panel and the two adjacent bending parts, so that the two connecting parts are in inverted arch failure.

Disclosure of Invention

The application provides a flexible display panel and display device, mainly solve flexible display panel including under book and the outer combination form of rolling over, flexible display panel's center and two adjacent kink junctions position can invert the problem of encircleing the inefficacy.

In order to solve the technical problem, the application adopts a technical scheme that: provided is a flexible display panel including:

a flexible screen body having opposing display and back surfaces, comprising:

the first non-bending part, the first bending part and the second bending part which are respectively connected with two ends of the first non-bending part, the second non-bending part which is connected with the first bending part, and the third non-bending part which is connected with the second bending part;

support piece, set up in the back of the flexible screen body, and have be close to the first face of the flexible screen body and with the second face that first face carried on the back mutually sets up, support piece includes:

a first support, a second support, a third support, a fourth support and a fifth support, which are respectively arranged corresponding to the first non-bending part, the first bending part, the second non-bending part and the third non-bending part; the second support and the third support may be bent in opposite directions to each other with respect to the first support;

the second supporting part is provided with a first opening corresponding to the position of the first bending part, which is close to the initial bending part of the first non-bending part, and/or the thickness of at least part of the position, which is different from the first opening, of the second supporting part is smaller than that of the first supporting part.

Specifically, the opening of the second support member penetrates through the first face and the second face.

Specifically, a second opening is formed in the third support corresponding to a position of the second bent portion, which is close to the initial bent portion of the first non-bent portion, and/or the thickness of at least a portion of a position, which is different from the second opening, of the third support is smaller than the thickness of the first support.

Preferably, the support is provided with a first elastic material except for the first opening and the second opening to form a first planarization layer.

Specifically, the part of the second support and/or the third support, which is close to the first support, comprises a plurality of first support bars and at least one first connecting piece; the extending direction of the first connecting piece and the extending direction of the first supporting strip are obliquely arranged at a preset angle; the plurality of first supporting body strips are arranged on the at least one first connecting piece at intervals along a first direction;

preferably, a gap between two adjacent first supporting strips is filled with a first elastic material;

and/or the first support part comprises a plurality of second support bars and at least one second connecting piece which are arranged at intervals; the extending direction of the second connecting piece and the extending direction of the second supporting strip are obliquely arranged at a preset angle; the plurality of second supporting body strips are arranged on the at least one second connecting piece at intervals along a first direction;

preferably, a gap between two adjacent second supporting bars is filled with a second elastic material.

Specifically, the flexible screen body has display surface and the back that is carried on the back mutually, includes:

a first support, a second support, a third support, a fourth support and a fifth support, which are respectively arranged corresponding to the first non-bending part, the first bending part, the second non-bending part and the third non-bending part; the second support and the third support may be bent toward the same direction with respect to the first support;

wherein the first support comprises a plurality of third support bars; the plurality of third support bars are arranged at intervals along a first direction, and are adjacent to each other in the direction of the center line of the first support piece along the first direction, the space between every two adjacent third support bars is gradually reduced, and/or the third support bars are gradually increased along the sectional area of the stacking direction of the flexible display panel.

Specifically, in the first direction, along a direction toward a center line of the first support member, a distance between two adjacent third support bars is gradually reduced, and cross-sectional areas of the plurality of third support bars along the stacking direction are the same; or

In the first direction, along the direction towards the center line of the first support piece, the sectional area of the plurality of third support strips along the stacking direction is gradually increased, and the intervals between every two adjacent third support strips are the same; or

In the first direction, along a direction towards a center line of the first support piece, the sectional area of the plurality of third support strips along the stacking direction is gradually increased, and the distance between every two adjacent third support strips is gradually decreased;

preferably, the distance between two adjacent third supporting strips is the same, and the thickness of the plurality of third supporting strips in the stacking direction gradually increases in the first direction along the direction towards the center line of the first supporting piece;

preferably, the cross section of the third supporting strip along the stacking direction is trapezoidal;

or the distance between every two adjacent third supporting strips is the same; the vertical section of each third supporting strip is circular; in the first direction, the radius of the third support bars in a plurality of round shapes is gradually increased along the direction towards the center line of the first support piece.

Specifically, a gap between two adjacent third supporting bars is filled with a third elastic material;

preferably, the thickness of the second support and/or the third support is less than the thickness of the first support, and the first face of the second support and/or the third support is flush with the first face of the first support;

preferably, the second face of the second support and/or the second face of the third support are also provided with the third elastic material, and a side surface of the third elastic material facing away from the second support or the third support is flush with the second face of the first support.

Specifically, the distance between every two adjacent third supporting bars is gradually increased along the bending direction of the supporting piece.

Specifically, the first supporting part further comprises at least one third connecting part, and two ends of each third connecting part are respectively connected with the second supporting part and the third supporting part on two sides; the plurality of third supporting strips are arranged on the at least one third connecting piece at intervals and are respectively arranged with the second supporting piece and the third supporting piece at intervals;

preferably, a gap between the third supporting strip and the second and third supporting pieces is filled with a third elastic material, and a side surface of the third elastic material facing away from the third connecting piece is flush with a side surface of the third supporting strip facing away from the third connecting piece;

preferably, the plurality of third supporting bars are arranged on one side surface of the at least one third connecting piece facing the flexible screen body;

preferably, the at least one third connecting element is an adhesive film; the bonding film layer is provided with a bonding surface, and the plurality of third supporting strips are bonded to the bonding surface of the bonding film layer.

In order to solve the above technical problem, another technical solution adopted by the present application is to provide a display device including the above flexible display panel.

The flexible display panel and the display device provided by the embodiment of the application are provided. The flexible display panel is provided with a flexible screen body, and the flexible screen body comprises a first non-bending part, a first bending part and a second bending part which are respectively connected with two ends of the first non-bending part, a second non-bending part connected with the first bending part, and a third non-bending part connected with the second bending part; and a support piece is arranged on the back surface of the flexible screen body to support the flexible screen body. The supporting piece comprises a first supporting piece, a second supporting piece, a third supporting piece, a fourth supporting piece and a fifth supporting piece which are respectively arranged corresponding to the first non-bending part, the first bending part, the second non-bending part and the third non-bending part; the second supporting piece and the third supporting piece can be bent towards opposite directions relative to the first supporting piece; the first opening is arranged at the position, corresponding to the first bending part, of the second supporting part, close to the initial bending part of the first non-bending part, and/or the thickness of at least part of the position, different from the first opening, of the second supporting part is smaller than that of the first supporting part, so that in the process that the flexible display panel is bent towards the opposite direction, the tensile stress or the compressive stress borne by the two ends of the first supporting part is buffered and released, the problem of stress concentration at the joint of the center of the flexible display panel and the two adjacent bending parts in the bending process of the flexible display panel is solved, the effect of the flatness of the first non-bending part and/or the first supporting part of the flexible display panel is improved, and the occurrence probability of the problem of inverted arch failure of the first non-bending part and/or the first supporting part of the flexible display panel due to flatness change caused by stress concentration is reduced.

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 view of a flexible display panel folded in two according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a flexible display panel folded in two according to an embodiment of the present disclosure;

fig. 3 is a schematic view of a flexible display panel folded outward and folded inward according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a flexible display panel folded in and out according to an embodiment of the present disclosure in a flattened state;

fig. 5 is a partial structural schematic view of a support member provided in an embodiment of the present application in a state where a flexible display panel is flattened;

fig. 6 is a schematic structural diagram of a flat-out state of a dual-fold-in or dual-fold-out flexible display panel according to another embodiment of the present disclosure;

FIG. 7 is a schematic view of a portion of a support member according to another embodiment of the present disclosure;

FIG. 8 is a schematic vertical cross-sectional view of a support bar according to a first embodiment of the present application in a first direction;

FIG. 9 is a schematic vertical cross-sectional view of a support bar according to a second embodiment of the present application, taken along a first direction;

FIG. 10 is a schematic vertical cross-sectional view of a support bar according to a third embodiment of the present application, taken along a first direction;

FIG. 11 is a schematic vertical cross-sectional view of a support bar according to a fourth embodiment of the present application, taken along a first direction;

fig. 12 is a schematic structural diagram of a display device according to an 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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.

The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. In the embodiment of the present application, all the directional indicators (such as upper, lower, left, right, front, and rear … …) are used only to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1 to fig. 3, fig. 1 is a schematic diagram of a flexible display panel 10 folded in two according to an embodiment of the present disclosure. Fig. 2 is a schematic diagram of a flexible display panel 10 folded in two according to an embodiment of the present application. Fig. 3 is a schematic diagram of an external folding and an internal folding of the flexible display panel 10 according to an embodiment of the present application. It should be noted that, the flexible screen 11 and the supporting member 12 are spaced from each other in fig. 1 to fig. 3 only for schematically distinguishing two structures, and it can be understood by those skilled in the art that, in an actual product, the flexible screen 11 and the supporting member 12 are disposed in a fitting manner. In a bent configuration of the flexible display panel 10, such as a double-in (as shown in fig. 1) or a double-out (as shown in fig. 2) or an out-and-in (as shown in fig. 3) configuration, the first non-bending portion 111 of the flexible screen 11 and/or the first supporting member 121 of the supporting member 12 may receive two common tensile or compressive stresses in opposite directions, and under the tensile or compressive stresses, a connection between the first non-bending portion 111 and the first bending portion 112 and a connection between the first non-bending portion 111 and the second bending portion 113, and/or a connection between the first supporting member 121 and the second supporting member 122 and a connection between the first supporting member 121 and the third supporting member 123 of the supporting member 12 are more likely to bounce and fail. Wherein, the double-folding-in means that both ends of the flexible display panel 10 are folded towards one side of the flexible screen body 11; it can be understood that, at this time, the first non-bending portion 111 of the flexible screen body 11 is subjected to two common compressive stresses in opposite directions, and a joint between the first non-bending portion 111 and the first bending portion 112 of the flexible screen body 11 and a joint between the first non-bending portion 111 and the second bending portion 113 are prone to bounce and arch failure; the first support 121 of the support 12 arranged on the rear side of the flexible screen 11 is subjected to two tensile stresses which are common in opposite directions. Double fold-out refers to both ends of the flexible display panel 10 being folded towards the side where the support 12 is located; it can be understood that, at this time, the first non-bent portion 111 of the flexible screen 11 is subjected to two opposite common tensile stresses; the first supporting part 121 of the supporting part 12 is subjected to two compressive stresses in the opposite directions, and the joint of the first supporting part 121 and the second supporting part 122 and the joint of the first supporting part 121 and the third supporting part 123 are prone to rebound and arch failure. The outward folding and the inward folding refer to that one end of the two ends of the flexible display panel 10 is folded towards one side where the flexible screen body 11 is located, and the other end of the two ends of the flexible display panel is folded towards one side where the supporting piece 12 is located; it can be understood that, at this time, the joint of the first non-bent portion 111 and the first bent portion 112 of the flexible screen body 11 and the joint of the first support 121 and the third support 123 of the support 12 are prone to bounce and fail to arch.

The flexible display panel 10 provided by the embodiment of the application can improve the condition that the flatness of the flexible display panel 10 changes and is easy to arch and lose efficacy under the double-inward folding or double-outward folding or outward folding and inward folding state.

The flexible display panel 10 provided in the present application is described in detail with reference to the drawings and the embodiments.

Referring to fig. 3 and 4, fig. 4 is a schematic structural diagram of a flexible display panel according to an embodiment of the present disclosure. In the embodiment of the present application, a flexible display panel 10 is provided, and the flexible display panel 10 may be a foldable display panel or a rollable display panel. The flexible display panel 10 comprises a flexible screen body 11 and a support 12.

The flexible screen body 11 has a display surface and a back surface opposite to each other, and is used for displaying pictures during operation. The flexible screen 11 includes a first non-bending portion 111, a first bending portion 112, a second bending portion 113, a second non-bending portion 114, and a third non-bending portion 115; the first bending portion 112 and the second bending portion 113 are respectively connected to two ends of the first non-bending portion 111, the second non-bending portion 114 is connected to the first bending portion 112, and the third non-bending portion 115 is connected to the second bending portion 113. As shown in fig. 4, the flexible panel 11 specifically includes a second non-bending portion 114, a first bending portion 112, a first non-bending portion 111, a second bending portion 113, and a third non-bending portion 115 connected to each other.

It will be appreciated by those skilled in the art that the flexible screen 11 may be in a more folded configuration and is not limited to a bi-folded configuration without departing from the inventive concept.

With further reference to fig. 3 and 4, in the present embodiment, a support member 12 is located at the back of the flexible screen body 11 for providing support to the flexible screen body 11. The support member 12 has a first face adjacent to the flexible screen 11 and a second face opposite to the first face. The support 12 includes a first support 121, a second support 122, a third support 123, a fourth support 124 and a fifth support 125 respectively corresponding to the first non-bending portion 111, the first bending portion 112, the second bending portion 113, the second non-bending portion 114 and the third non-bending portion 115. As shown in fig. 3, the second and third supporting members 122 and 123 may be bent in opposite directions with respect to the first supporting member 121. In this case, the flexible display panel 10 is folded outward and inward.

The second support 122 is provided with a first opening 122a corresponding to a position of the first bent portion 112 near the initial bent portion of the first non-bent portion 111, and/or a thickness of at least a portion of a position of the second support 122 different from the first opening 122a is smaller than a thickness of the first support 121, so as to form a first groove. A second opening 123a is disposed on a second surface of the third support 123 corresponding to a position of the second bent portion 113 near the initial bent portion of the first non-bent portion 111, and/or a thickness of at least a portion of the third support 123 different from the second opening 123a is smaller than a thickness of the first support 121, so as to form a second groove. Wherein, the opening of one of the first groove and the second groove faces the flexible screen body 11, and the opening of the other groove faces away from the flexible screen body 11; in the bending process, the second supporting member 122 is bent towards the opening direction deviating from the first groove, and the third supporting member 123 is bent towards the opening direction deviating from the second groove, so that when the second supporting member 122 and the third supporting member 123 are bent towards opposite directions, stress concentration at the bent position can be relieved through the first groove and the second groove respectively. The following description will be given taking an example in which the first groove is formed in the second support 122 and the second groove is formed in the third support 123.

Specifically, the first opening 122a of the second support 122 and the second opening 123a of the third support 123 penetrate the first surface and the second surface of the support 12, so that at least a portion of the second support 122 and at least a portion of the third support 123 are respectively disposed at an interval from the first support 121. It can be understood that, with reference to fig. 5, when the first opening 122a and/or the second opening 123a completely penetrate through two sides of the supporting member 12 along the plane of the supporting member 12 and the direction Y perpendicular to the extending direction of the supporting member 12, that is, the second supporting member 122 and/or the third supporting member 123 are spaced from the first supporting member 121.

In some embodiments, the second supporting element 122 is provided with a first opening 122a corresponding to a position of the first bending portion 112 near the initial bending portion of the first non-bending portion 111, and the third supporting element 123 is provided with a second opening 123a corresponding to a position of the second bending portion 113 near the initial bending portion of the first non-bending portion 111, so that the first opening 122a and the second opening 123a are utilized to release the force applied to the two ends of the first supporting element 121, thereby avoiding the reverse arch failure caused by the stress concentration.

Further, at least a part of the thickness of the second support 122 at a position different from the first opening 122a and at least a part of the thickness of the third support 123 at a position different from the second opening 123a are both smaller than the thickness of the first support 121; as such, the stress concentration problem can be further alleviated by the second and third supports 122 and 123 themselves, which have a smaller thickness.

In some embodiments, in conjunction with fig. 4, the fourth support 124 and the fifth support 125 are equally thick, and the thickness of the first support 121 is specifically less than the thickness of the fourth support 124 and the fifth support 125. Specifically, as shown in fig. 4, when the flexible display panel 10 is in the non-bent state, the first surface of the fourth support 124, the first surface of the first support 121, and the first surface of the portion of the third support 123 between the second groove and the second opening 123a are flush. The first surface of the fifth support 125 protrudes from the first surface of the first support 121 along the stacking direction of the flexible display panel 10, that is, is higher than the first surface of the first support 121. The second face of the fifth support 125, the second face of the third support 123, and the second face of the first support 121 are flush; the second surface of the fourth support 124 protrudes from the second surface of the first support 121 along the stacking direction of the flexible display panel 10.

In this embodiment, the first face of the fourth support 124, the first face of the first support 121, the second groove, and the first face of the portion of the third support 123 between the second groove and the second opening 123a are respectively provided with the first elastic material a to form a first planarization layer. Thus, the first elastic material a can be utilized to bear the bending stress applied to the corresponding position of the flexible display panel 10 as much as possible, so as to reduce the bending stress transmitted to other films, and prevent the other films from being separated from each other due to relative displacement. Further, a side surface of the first planarization layer facing away from the first support 121 is flush with a first face of the fifth support 125; so, can guarantee that support piece 12's first face all supports each position of the flexible screen body 11, improve support intensity, avoid the problem emergence of local flexible screen body 11 because of unsettled lead to the damage.

The second face of the fifth support 125, the second face of the third support 123, the second face of the first support 121, and the second face of the portion of the second support 122 between the first groove and the first opening 122a are also provided with the first elastic material a to form a second planarization layer. Therefore, the bending stress transmitted to other film layers can be further reduced, and the problem that the other film layers are separated from each other due to relative displacement is prevented. Meanwhile, a side surface of the second planarization layer facing away from the first support 121 is flush with a second face of the fourth support 124; so as to be completely attached to other structural layers. It is understood that the first and second planarizing layers make the thickness of the support 12 the same at each location.

The support 12 may be made of a metal material such as an aluminum alloy, a magnesium alloy, a zinc alloy, a titanium alloy, or stainless steel, and the support 12 may also be made of a material such as glass or carbon fiber.

In an embodiment, as shown in fig. 5, in a state that the flexible display panel is laid flat, a portion of the second support 122 and/or the third support 123 close to the first support 121, that is, a portion between the first groove and the first opening 122a and/or a portion between the second groove and the second opening 123a, includes a plurality of first support bars Z1 and at least one first connection member L1, which are disposed at intervals along the first direction a. Specifically, the first direction a refers to a direction perpendicular to a stacking direction of the flexible display panels 10, and a vertical cross section of each first support bar Z1 along the stacking direction of the flexible screen body 11 and the support 12 may be rectangular, trapezoidal, circular, or the like.

The extending direction of the first connecting piece L1 and the extending direction of the first supporting strip Z1 are obliquely arranged at a preset angle; the plurality of first supporting bars Z1 are disposed on the at least one first connecting element L1 at intervals along the first direction. Preferably, the extending direction of the first connecting piece L1 is parallel to the first direction a and perpendicular to the extending direction of the first support bar Z1. In some embodiments, the sum of the thickness of the first support bar Z1 and the thickness of the first connector L1 is the same as the thickness of the first support 121.

The gap between the adjacent two first support bars Z1 is filled with the first elastic material a.

With reference to fig. 5, the first supporting element 121 includes a plurality of second supporting bars Z2 and at least one second connecting element L2 disposed at intervals; the extending direction of the second connecting piece L2 and the extending direction of the second supporting strip Z2 are obliquely arranged at a preset angle; the second supporting bars Z2 are disposed on the at least one second connecting member L2 at intervals along the first direction a, and are disposed at intervals with the second supporting member 122 and the third supporting member 123, respectively. Preferably, the extending direction of the second connecting member L2 is parallel to the first direction a and perpendicular to the extending direction of the second supporting bar Z2. The thickness of the first connecting piece L1 may be the same as the thickness of the second connecting piece L2, and the thickness of the first supporting strip Z1 may be the same as the thickness of the second supporting strip Z2.

The gap between two adjacent second supporting bars Z2 is filled with a second elastic material b. Therefore, in the process of folding the flexible display panel 10 outward and inward, the tensile stress or the compressive stress applied to the two ends of the first supporting member 121 is buffered and released, so as to improve the stress concentration problem of the flexible display panel 10 in the bending process, effectively improve the flatness effect of the first non-bending portion 111 and/or the first supporting member 121 of the flexible display panel 10, and reduce the occurrence probability of the problem of the reverse arch failure caused by the flatness change due to the stress concentration of the first non-bending portion 111 and/or the first supporting member 121 of the flexible display panel 10.

Specifically, the second elastic material a and the second elastic material b may be a thermoplastic polyurethane elastomer, a polyamide-based thermoplastic elastomer, or the like, so as to provide a buffering effect when the flexible display panel 10 is subjected to a bending motion.

Referring to fig. 1, fig. 2, fig. 6 and fig. 7, the flexible display panel 10 includes a flexible screen 11 and a supporting member 12. The flexible screen body 11 has a display surface and a back surface opposite to each other, and is used for displaying pictures during work. Specifically, the flexible screen body 11 is the flexible screen body 11 according to any of the above embodiments, and the specific structure and function of the flexible screen body 11 may refer to the description of the flexible screen body 11 provided in the above embodiments, which is not described herein again.

Referring further to fig. 6 and 7, in the present embodiment, the difference from the above-mentioned support member 12 of the flexible display panel 10 folded in and out is that the support member 12 in the present embodiment has no opening. Other specific structures and functions of the supporting member 12 can be referred to the related description of the supporting member 12 provided in the above embodiments, and are not described herein again. As shown in fig. 1 and 2, the second and third supports 122 and 123 may be bent toward the same direction as each other with respect to the first support 121. In this case, the flexible display panel 10 is in a double-folded-in (fig. 1) or double-folded-out (fig. 2) form. Wherein the first supporting member 121 includes a plurality of third supporting bars Z3; a plurality of third supporting bars Z3 are arranged at intervals along the first direction a.

In other embodiments, the number of the first supports 121 of the support 12 may be multiple, and two adjacent first supports 121 are connected by the second support 122 and the third support 123.

In a particular embodiment, the support 12 has a first face adjacent to the flexible screen 11 and a second face disposed opposite the first face. The thickness of the second support 122 and/or the third support 123 is less than the thickness of the first support 121, and the first face of the second support 122 and/or the third support 123 is flush with the first face of the first support 121. So, can further alleviate the stress concentration problem, and can guarantee that support piece 12 all supports each position of the flexible screen body 11, improved support strength, avoided the problem emergence that local flexible screen body 11 leads to the damage because of unsettled.

A third elastic material c is disposed on the second surface of the second support 122 and/or the second surface of the third support 123, and a side surface of the third elastic material c away from the second support 122 or the third support 123 is flush with the second surface of the first support 121, so as to ensure flatness of the flexible display panel 10, reduce rigidity of the first support 121, and reduce stress applied to the first support 121, thereby reducing occurrence probability of a reverse arch failure problem caused by flatness change of the first non-bending portion 111 and/or the first support 121 due to stress concentration in a double-in-folding or double-out-folding process. The third elastic material c may be a super-elastic material or a shape memory polymer, and when the flexible display panel is bent, the third elastic material c can effectively release the common stress in two directions, so as to reduce the degree of flatness change of the flexible display panel 10, thereby preventing the first non-bending portion 111 from being inverted and failing.

Specifically, the thickness of the first supporting member 121 is 50um to 150um. For example, the thickness of the first support 121 may be 50um, 60um, 80um, 100um, 110um, 120um, 130um, 140um, and 150um.

Specifically, the thickness of each of the second support 122 and the third support 123 is less than 50um. For example, the second and third supports 122 and 123 may be 10um, 15um, 20um, 25um, 30um, 35um, 40um, 45um, and 49um.

In the first direction a, the distance between two adjacent third supporting bars Z3 gradually decreases in the direction toward the center line M of the first supporting member 121, and/or the sectional area of the plurality of third supporting bars Z3 in the stacking direction gradually increases. The cross-sectional area of the third supporting bar Z3 in the stacking direction refers to an area of a cross-section of the third supporting bar Z3 in the stacking direction of the flexible display panel 10. Thus, in the process of folding the flexible display panel 10 in two directions or folding the flexible display panel in two directions, the two opposite common tensile stresses or compressive stresses applied to the two ends of the first supporting member 121 are buffered and released, so as to improve the stress concentration problem of the flexible display panel 10 in the bending process, effectively improve the flatness effect of the first non-bending portion 111 and/or the first supporting member 121 of the flexible display panel 10, and reduce the occurrence probability of the problem of the reverse arch failure caused by the flatness change due to the stress concentration of the first non-bending portion 111 and/or the first supporting member 121 of the flexible display panel 10.

The specific structure of the third supporting bar Z3 will be described below.

Fig. 8-11 are all methods or means provided for the support strip 1211 of the double-in-fold or double-out-fold flexible display panel 10.

In some embodiments, referring to fig. 8, fig. 8 is a schematic vertical cross-sectional view of a support strip provided by the first embodiment of the present application, taken along a cross-section in a first direction. As shown, in the first direction a, the spacing between two adjacent third supporting bars Z3 gradually decreases in a direction toward the center line M of the first supporting member 121; as in fig. 3, pitch R1> pitch R2> pitch R3; a gradually decreasing tendency is exhibited, and the sectional areas of the cross sections of the plurality of third supporting bars Z3 in the stacking direction are the same. The vertical cross section of the third supporting strip Z3 is trapezoidal, and in other embodiments, the cross section of the third supporting strip Z3 is also trapezoidal; but may of course be round, rectangular or of other shapes.

In other embodiments, referring to fig. 9, fig. 9 is a cross-sectional vertical sectional view of a supporting bar provided in the second embodiment of the present application along a first direction. In the first direction a, along a direction toward the center line M of the first support 121, the cross-sectional areas of the cross-sections of the plurality of third support bars Z3 in the stacking direction gradually increase, and the distances R4 between two adjacent third support bars Z3 are the same.

Specifically, the widths of the plurality of third supporting bars Z3 are the same, and the thicknesses of the plurality of third supporting bars Z3 are gradually increased; in the process of performing double inward folding or double outward folding on the flexible display panel 10, the common tensile stress or compressive stress in two directions is released to reduce the degree of flatness change of the flexible display panel 10, thereby avoiding the occurrence of the failure phenomenon caused by flatness change due to stress concentration in the first non-bending portion 111 and/or the first supporting member 121 of the flexible screen body 11. It should be noted that the width of the third supporting bar Z3 refers to a vertical cross section of the third supporting bar Z3, which is a dimension perpendicular to the stacking direction of the flexible display panel 10; when the vertical cross section of the third supporting bar Z3 is not rectangular, the width of the third supporting bar Z3 may be an average of the widths of the third supporting bar Z3 at each position in the stacking direction of the flexible display panels 10; it can be understood that, as shown in fig. 8, the width of the uppermost surface of the cross section of the third supporting bar Z3 is the same, when the flexible screen body 11 makes a downward bending motion, the distance between the supporting pieces 12 is gradually increased along the downward direction, i.e. the distance D1< the distance D2< the distance D3. In the first direction a, the thickness of the plurality of third supporting bars Z3 gradually increases in a direction toward the center line M of the first supporting member 121. The thickness of the third supporting bar Z3 refers to a dimension of the third supporting bar Z3 in the stacking direction of the flexible display panel.

Preferably, the cross-sectional vertical section of the third supporting strip Z3 in this embodiment is trapezoidal. In other embodiments, the cross-sectional vertical section of the third supporting bar Z3 may also be circular, rectangular or other shapes. The flexible display panel is used for releasing common tensile stress or compressive stress in two directions when the flexible screen body 11 performs bending motion, so as to reduce the degree of flatness change of the flexible display panel 10. The phenomenon that the first non-bending part 111 of the flexible screen body 11 fails due to flatness change caused by stress concentration is avoided.

Referring to fig. 10, fig. 10 is a cross-sectional vertical cross-sectional view of a support strip provided in a third embodiment of the present application, taken along a first direction. In the first direction a, in a direction toward the center line M of the first support 121, the cross-sectional areas of the cross-sections of the plurality of third support bars Z3 in the stacking direction gradually increase, and the distance R5> the distance R6> the distance R7 between two adjacent third support bars Z3 shows a gradually decreasing trend. In this embodiment, the cross-sectional vertical section of the third supporting strip Z3 is trapezoidal, and in other embodiments, the cross-sectional vertical section of the third supporting strip Z3 may also be circular, rectangular or other shapes. When the flexible screen 11 performs a bending motion, the tensile stress or the compressive stress common in the two directions is released, so as to reduce the degree of flatness variation of the flexible display panel 10.

Referring to fig. 11, fig. 11 is a cross-sectional vertical cross-sectional view of a support strip provided in a fourth embodiment of the present application, taken along a first direction. The distance R8 between two adjacent third supporting bars Z3 is the same. The vertical cross section of each third supporting strip Z3 in the embodiment is circular; in the first direction a, along the direction toward the center line M of the first support member 121, the radius r3< the radius r2< the radius r1 of the plurality of circular third support bars Z3 shows a gradually increasing trend, and when the flexible screen body 11 performs a bending motion, the common tensile stress or compressive stress in the two directions is released, so as to reduce the degree of flatness change of the flexible display panel 10.

In a specific embodiment, the arrangement of the second embodiment is more preferable, and the effect is better. That is, the intervals between two adjacent third supporting bars Z3 are the same, and the thickness of the plurality of third supporting bars Z3 in the stacking direction gradually increases in the first direction a along the direction toward the center line M of the first supporting member 121.

With continued reference to fig. 7 and 8, the third supporting strip Z3 of the first supporting member 121 is comb-shaped; in one embodiment, the gap between two adjacent third supporting bars Z3 is also filled with a third elastic material c; the first supporting member 121 of the supporting member 12 further includes at least one third connecting member L3, and two ends of each third connecting member L3 are respectively connected to the second supporting member 122 and the third supporting member 123; a plurality of third supporting bars Z3 are disposed on the at least one third connecting member L3 at intervals, and are disposed at intervals with the second supporting member 122 and the third supporting member 123, respectively. The plurality of third supporting bars Z3 are disposed on a side surface of the at least one third connecting member L3 facing the flexible screen body 11.

Preferably, at least one third connecting element L3 is an adhesive film; the adhesive film layer is provided with an adhesive surface, and the plurality of third supporting strips Z3 are adhered to the adhesive surface of the adhesive film layer. When the supporting member 12 is adhered to the back surface of the flexible screen body 11 through the adhesive film layer under vacuum condition, no bulge occurs between the adhesive film layer and the supporting member 12, and the flexible screen body 11 can be smoothly adhered to the supporting member 12.

And a gap between the third support strip Z3 and the second and third supports 122 and 123 is filled with a third elastic material c, and one side surface of the third elastic material c departing from the third connecting piece L3 is flush with one side surface of the third support strip Z3 departing from the third connecting piece L3. Therefore, two adjacent third supporting bars Z3 can be connected through the third elastic material c, so that the third elastic material c is utilized to receive bending stresses applied to the first non-bending portion 111 and the first supporting member 121 of the flexible display panel 10 as much as possible during the bending process of the flexible display panel, and the bending stresses transmitted to other film layers are reduced. For example, the bending stress transmitted to the bonding layer between the flexible screen body 11 and the supporting member 12 can be reduced, that is, the stress of the interlayer bonding layer of the flexible display panel 10 is reduced, so that the problem that the structures of the layers of the flexible display panel 10, such as the flexible screen body 11 and the supporting member 12, are separated from each other due to relative displacement caused by overlarge stress of the interlayer bonding layer, is prevented; the third elastic material c can play a certain buffering role, and ensure the smoothness of the flexible display panel 10. The Adhesive layer may be an OCA (optical Clear Adhesive) glue layer.

Specifically, the first elastic material a and the third elastic material c may be thermoplastic polyurethane elastomer, polyamide-based thermoplastic elastomer, or the like, so as to provide a buffering effect when the flexible display panel 10 is subjected to a bending motion.

In a specific embodiment, with reference to fig. 2 and 8, the spacing between two adjacent third supporting bars Z3 is gradually increased along the bending direction W toward the supporting member 12; in this way, for the third elastic material c filled between any two third supporting bars Z3, the cross-sectional area of the third elastic material c gradually increases along the bending direction W toward the supporting member 12, so that the third elastic material c with a larger cross-sectional area can be used to effectively release the bending stress, thereby improving the situation that the first non-bending portion and/or the first supporting member 121 fails in the inverted arch due to stress concentration.

The application provides a flexible display panel 10 and a display device. The flexible display panel 10 includes a flexible panel 11 and a supporting member 12, wherein the flexible panel 11 has a display surface and a back surface opposite to each other, and includes a first non-bending portion 111, a first bending portion 112, a second bending portion 113, a second non-bending portion 114, and a third non-bending portion 115; and a support member 12 is disposed on the back of the flexible screen body 11 to support the flexible screen body 11. By means of the method or scheme that the supporting member 12 is provided with the plurality of third supporting bars Z3 spaced along the first direction a in correspondence to the first non-bending portion 111 of the flexible screen body 11, and in the first direction a, along the direction toward the center line M of the first supporting member 121, the distance between the third supporting bars Z3 is gradually decreased, and/or the cross-sectional areas of the plurality of third supporting bars Z3 are gradually increased, in the bending process of the flexible display panel 10, the tensile stress or the compressive stress applied to the two ends of the first supporting member 121 is buffered and released, so that the stress concentration problem of the flexible display panel 10 in the bending process is improved, the effect of the flatness of the first non-bending portion 111 and/or the first supporting member 121 of the flexible display panel 10 is effectively improved, and the occurrence probability of the problem of the reverse arch failure due to the flatness change caused by the stress concentration of the first non-bending portion 111 and/or the first supporting member 121 of the flexible display panel 10 is reduced.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present application. The application also provides a display device, which can be a desktop computer, a notebook computer, a mobile phone, a tablet computer, a display and other products with display interfaces. The embodiment of the present application does not specifically limit the specific form of the display device. The display device comprises a flexible display panel 10 for displaying pictures during operation. The flexible display panel 10 according to any of the embodiments above is the flexible display panel 10, and the specific structure and function of the flexible display panel 10 can be referred to the related description of the display panel 10 provided in the embodiments above, and are not described herein again.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A flexible display panel, comprising:

a flexible screen body having opposing display and back surfaces, comprising:

support piece, set up in the back of the flexible screen body to have and be close to the first face of the flexible screen body and with the second face that first face carried on the back mutually and sets up, support piece includes:

a first support, a second support, a third support, a fourth support and a fifth support, which are respectively arranged corresponding to the first non-bending part, the first bending part, the second non-bending part and the third non-bending part; the second support and the third support may be bent in opposite directions with respect to the first support;

2. The flexible display panel of claim 1,

the opening of the second support member extends through the first and second faces.

3. The flexible display panel of claim 1,

a second opening is formed in the third support corresponding to the position, close to the initial bending position of the first non-bending part, of the second bending part, and/or the thickness of at least part of the position, different from the second opening, of the third support is smaller than that of the first support;

preferably, the support is provided with a first elastic material at a position excluding the first opening and the second opening to form a first planarization layer.

4. The flexible display panel according to claim 1,

the part of the second support and/or the third support, which is close to the first support, comprises a plurality of first support strips and at least one first connecting piece; the extending direction of the first connecting piece and the extending direction of the first supporting strip are obliquely arranged at a preset angle; the plurality of first supporting strips are arranged on the at least one first connecting piece at intervals along a first direction;

and/or the first support part comprises a plurality of second support bars and at least one second connecting piece which are arranged at intervals; the extending direction of the second connecting piece and the extending direction of the second supporting strip are obliquely arranged at a preset angle; the second supporting strips are arranged on the at least one second connecting piece at intervals along a first direction;

preferably, the gap between two adjacent second supporting bars is filled with a second elastic material.

5. A flexible display panel, comprising:

a flexible screen body having opposing display and back surfaces, comprising:

6. The flexible display panel of claim 5,

in the first direction, along the direction towards the center line of the first support piece, the distance between two adjacent third support strips is gradually reduced, and the cross sections of the plurality of third support strips along the stacking direction are the same; or

7. The flexible display panel according to claim 5,

a gap between every two adjacent third supporting strips is filled with a third elastic material;

8. The flexible display panel of claim 5,

and the distance between every two adjacent third supporting strips is gradually increased along the bending direction of the supporting piece.

9. The flexible display panel of claim 5,

the first supporting part also comprises at least one third connecting part, and two ends of each third connecting part are respectively connected with the second supporting part and the third supporting part on two sides; the plurality of third supporting strips are arranged on the at least one third connecting piece at intervals and are respectively arranged with the second supporting piece and the third supporting piece at intervals;

preferably, the at least one third connecting element is an adhesive film layer; the bonding film layer is provided with a bonding surface, and the plurality of third supporting strips are bonded to the bonding surface of the bonding film layer.

10. A display device comprising the flexible display panel according to any one of claims 1 to 9.