CN115066717B

CN115066717B - Flexible display panel and display device

Info

Publication number: CN115066717B
Application number: CN202080080502.3A
Authority: CN
Inventors: 闫德松; 廖富
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2024-01-19
Anticipated expiration: 2040-12-28
Also published as: WO2022141003A1; CN115066717A

Abstract

A flexible display panel (100) and a display device, comprising: a display layer (10), a first group of layers (20) located above the display layer (10), and a second group of layers (30) located below the display layer (10); at least part of the flexible display panel (100) is bendable about a predetermined axis by an angle of more than 120 °; the first group of layers (20) comprises at least one film layer; the second group of layers (30) comprises at least one support layer (31), the support layer (31) comprising a rigid material.

Description

Flexible display panel and display device

Technical Field

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

Background

With the development of display technology, a flexible display device that can be bent multiple times is gradually introduced into the market, and is increasingly receiving attention in the industry.

After the flexible display panel of the flexible display device is bent for a plurality of times by a user, bending stress is easy to accumulate between film layers in the flexible display panel, so that the phenomenon of film layer dislocation or film layer splitting of each film layer of the flexible display panel occurs.

Accordingly, there is a need to provide a flexible display panel in which interlayer bonding is more stable and bending stress is less likely to accumulate, so as to reduce occurrence of film dislocation or film cleavage.

Disclosure of Invention

One of the embodiments of the present application provides a flexible display panel, including: a display layer, a first group of layers located above the display layer, and a second group of layers located below the display layer; at least part of the flexible display device may be bent around a predetermined axis by an angle of more than 120 °; the first layer group comprises at least one film layer; the second layer group includes at least one support layer comprising a rigid material.

In some embodiments, the flexible display panel further comprises: the cladding piece, cladding piece cladding is at least one of: the edge of the display layer, the edge of the first group of layers and the edge of the second group of layers.

In some embodiments, the first layer group includes a cover sheet layer and a first adhesive film layer.

In some embodiments, the first adhesive layer coats the display layer and at least a portion of the second layer group forms a coating.

In some embodiments, the first adhesive layer has an extension portion having a length exceeding a length of the corresponding display layer in a direction parallel to the predetermined axis, and the extension portion extends to a lower surface of the second layer group to form the covering member.

In some embodiments, the portion of the first adhesive layer extending to the lower surface of the second layer group has a length in a direction parallel to the predetermined axis of between 1mm and 5 mm.

In some embodiments, the thickness of the portion of the first adhesive layer extending to the lower surface of the second layer group is between 0.025mm and 0.5 mm.

In some embodiments, the material of the first adhesive layer comprises optically clear adhesive.

In some embodiments, the second layer group includes a support layer and a second adhesive layer.

In some embodiments, the second adhesive layer coats the display layer and at least a portion of the first layer group forms a coating.

In some embodiments, the second adhesive layer has an extension portion having a length exceeding a length of the corresponding display layer in a direction parallel to the predetermined axis, and the extension portion extends to an upper surface of the first layer group to form the covering member.

In some embodiments, the portion of the second adhesive layer extending to the upper surface of the first layer group has a length in a direction parallel to the predetermined axis of between 0.7mm and 3 mm.

In some embodiments, the thickness of the portion of the second adhesive layer extending to the upper surface of the first layer group is between 0.025mm and 0.5 mm.

In some embodiments, the material of the second adhesive layer comprises a pressure sensitive adhesive or optically clear adhesive.

In some embodiments, the first layer set includes a cover sheet layer and a first adhesive layer, the second layer set includes a support layer and a second adhesive layer, and the first adhesive layer and the second adhesive layer are joined to each other to form the overmold.

In some embodiments, the first adhesive layer has a first extension having a length exceeding a length of the corresponding display layer in a direction parallel to the predetermined axis; the second adhesive film layer is provided with a second extension part with a length exceeding the length of the corresponding display layer along the direction parallel to the preset axis; the first extension portion and the second extension portion are mutually jointed to form the cladding piece.

In some embodiments, the first and second adhesive layers are the same material.

In some embodiments, the second layer group includes a buffer film layer.

In some embodiments, the buffer film layer encapsulates the display layer and at least a portion of the first layer group forms an encapsulation.

In some embodiments, the buffer film layer has an extension portion having a length exceeding a length of the corresponding display layer in a direction parallel to the predetermined axis, and the extension portion extends partially to an upper surface of the first layer group to form the covering member.

In some embodiments, the portion of the buffer film layer extending to the upper surface of the first group of layers has a length in a direction parallel to the predetermined axis of between 0.7mm and 3 mm.

In some embodiments, the portion of the buffer film layer extending to the upper surface of the first layer set has a thickness between 0.025mm and 0.5 mm.

In some embodiments, the material of the buffer film layer comprises foam, gel, or silica gel.

In some embodiments, the exterior surface of the envelope portion of the wrapper is non-tacky.

In some embodiments, at least a portion of the lower surface of the second layer set includes a plurality of lands disposed in a distributed manner.

In some embodiments, the bosses are distributed at a spacing of 0.1mm-2mm in a direction perpendicular to the predetermined axis.

In some embodiments, the shape of the boss includes hemispherical, tooth-like, and elongated shapes.

In some embodiments, the boss is machined into the support layer.

In some embodiments, the boss is bonded to the lower surface of the support layer.

In some embodiments, the material of the boss comprises steel sheet, alloy, or glass.

One of the embodiments of the present application provides a display device including a flexible display panel, the flexible display panel including: a display layer, a first group of layers located above the display layer, and a second group of layers located below the display layer; at least a portion of the flexible display panel may be bent around a predetermined axis by an angle greater than 120 °; the first layer group comprises at least one film layer; the second layer group includes at least one support layer comprising a rigid material.

In some embodiments, the display device further comprises: a rotation shaft about which at least a portion of the flexible display panel is bendable; at least one group of limiting grooves arranged at two ends of the flexible display panel along the direction parallel to the preset axis; the limiting groove limits the movement of the flexible display panel along the direction perpendicular to the display surface.

In some embodiments, at least a portion of the non-display area of the flexible display panel in a direction parallel to the predetermined axis slides in the first direction in the limiting groove.

In some embodiments, a plurality of protrusions are distributed on the upper surface and/or the lower surface of the area, located inside the limiting groove, of the flexible display panel, and the protrusions can reduce the contact area between the flexible display panel and the limiting groove.

Benefits that may be brought by one or more embodiments disclosed herein include, but are not limited to: (1) The cladding piece provided by one or more embodiments of the present application can clad and reinforce the display layer and the flexible display panel, so as to effectively improve the binding force between the display layer and each film layer of the flexible display panel; (2) The cladding piece provided by one or more embodiments of the present application is formed by an inner film layer of a flexible display panel, and can be more directly clad on the display layer, so as to improve the reinforcement effect on the inner film layer of the display layer; (3) The supporting layer provided by one or more embodiments of the present application includes a plurality of bosses distributed and arranged, which can effectively reduce bending stress generated in the bending process of the flexible display panel, and can effectively prevent dislocation of the film layer caused by overlarge bending stress between the film layers of the flexible display panel; (4) The limiting groove provided by one or more embodiments of the application can effectively limit the movement of the flexible display panel along the display surface direction of the flexible display panel, and can effectively prevent each film layer of the flexible display panel from splitting and scattering.

Drawings

The present application will be further illustrated by way of example embodiments, which will be described in detail with reference to the accompanying drawings. The embodiments are not limiting, in which like numerals represent like structures, wherein:

FIG. 1 is one of the partial schematic structural views of a display device shown in accordance with some embodiments of the present application;

FIG. 2 is one of the schematic structural diagrams of a flexible display panel shown according to some embodiments of the present application;

FIG. 3 is a second schematic illustration of a portion of a display device according to some embodiments of the present application;

FIG. 4A is a second schematic diagram of a flexible display panel according to some embodiments of the present application;

FIG. 4B is a third schematic structural view of a flexible display panel according to some embodiments of the present application;

FIG. 5 is an enlarged partial schematic view of region A of FIG. 4A according to the present application;

FIG. 6 is one of the schematic diagrams of the manufacturing process of the cladding member of the flexible display panel according to some embodiments of the present application;

FIG. 7 is a fourth schematic diagram of a flexible display panel according to some embodiments of the present application;

FIG. 8 is an enlarged partial schematic view of region B of FIG. 7 according to the present application;

FIG. 9 is a second schematic illustration of a manufacturing process of a cladding member of a flexible display panel according to some embodiments of the present application;

FIG. 10 is a fifth schematic structural view of a flexible display panel according to some embodiments of the present application;

FIG. 11 is a third schematic illustration of a manufacturing process of a cladding member of a flexible display panel according to some embodiments of the present application;

FIG. 12 is a third partial schematic view of a display device according to some embodiments of the present application;

FIG. 13 is a fourth schematic illustration of a portion of a display device according to some embodiments of the present application;

FIG. 14 is an enlarged partial schematic view of region C of FIG. 13 according to the present application;

FIG. 15 is a fifth partial schematic diagram of a display device according to some embodiments of the present application;

FIG. 16 is a schematic illustration of a portion of a display device according to some embodiments of the present application;

fig. 17 is a partially schematic illustration of a display device according to some embodiments of the present application.

Detailed Description

Reference will now be made in detail to exemplary embodiments or implementations, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the terms "first," "second," and the like, as used in the specification and the claims herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded.

The flexible display panel of one or more embodiments of the present application may be applied to display devices of different electronic products. Different electronic products may include, but are not limited to, various terminal devices such as cell phones, personal computers, keyboards, displays, televisions, car display terminals, electronic books, and the like.

The flexible display panel of some embodiments of the present application has a display area that can display content for viewing by a user. The flexible display panel includes a non-bent portion and a bent portion, and the display area is located on the non-bent portion and the bent portion. When the bending portion of the flexible display panel is bent or curved to change the form, the area of the display area that can be observed by the user also changes. In some embodiments, the display area of the flexible display panel exposed in the user's field of view may be used as a display screen of the sliding screen mobile phone, the bending portion of the flexible display panel is bent through the rotating shaft and then is stored at the back of the main display area or directly wound on the rotating shaft, and the user may select to store the bending portion of the flexible display panel at the back of the display area or directly wind on the rotating shaft according to the requirement, so as to reduce the area of the display area exposed by the flexible display panel, so that the flexible display device is more portable; the user may also choose to pull the curved portion of the flexible display panel out from behind the display area to increase the area of the display area exposed by the flexible display panel to display more content.

In some embodiments, referring to fig. 1, the flexible display panel 100 may include a non-bending portion 110 and a bending portion 120, the display region 101 may be located on front surfaces of the non-bending portion 110 and the bending portion 120, and the bending portion 120 may be received on a rear surface of the non-bending portion 110 after being bent about a predetermined axis 130, wherein a surface of the flexible display panel 100 for display may be understood as a front surface and a surface opposite thereto may be understood as a rear surface. In some embodiments, some or all of the curved portion 120 may be curved about a predetermined axis 130 relative to the front face of the non-curved portion 110. In some embodiments, the bend angle of the bend 120 about the predetermined axis 130 may be greater than 120 °; in some embodiments, the bend 120 may have a bend angle about the predetermined axis 130 of greater than 150 °; in some embodiments, the bend 120 may have a bend angle about the predetermined axis 130 of greater than 170 °; in some embodiments, the bend angle of the bend 120 about the predetermined axis 130 may be approximately 180 ° (within plus or minus 5 °); in some embodiments, the bend 120 may be bent at an angle substantially greater than 180 ° about the predetermined axis 130, i.e., may be curled about a fixed axis. The bending angle of the bending portion 120 about the predetermined axis 130 means an angle at which the front surface of the bent portion of the bending portion 120 changes with respect to the front surface of the non-bending portion 110 after a part or all of the bending portion 120 is bent about the predetermined axis 130. In some embodiments, both the non-curved portion 110 and the curved portion 120 may be used to display images. In some embodiments, the stiffness of the bend 120 in the first direction is less than its stiffness in the second direction. Referring to fig. 1, a first direction in the present application refers to a direction in which the flexible display screen is perpendicular or substantially perpendicular to the predetermined axis 130; the direction in which the flexible display is parallel or substantially parallel to the predetermined axis 130 is a second direction. By substantially perpendicular in this application is meant that small errors in the direction relative to perpendicular, which may be within plus or minus 5 deg., are allowed. In some embodiments, the error may be between ±4°. In some embodiments, the error may be between ±3°. In some embodiments, the error may be between 1 °.

In some embodiments, the stiffness of the bend 120 in the first direction is between 0.01GPa and 100 GPa; in some embodiments, the stiffness of the bend 120 in the first direction is between 0.01GPa and 50 GPa; in some embodiments, the stiffness of the bend 120 in the first direction is between 0.01GPa and 20 GPa; in some embodiments, the stiffness of the bend 120 in the first direction is between 0.01GPa and 10 GPa; in some embodiments, the stiffness of the bend 120 in the first direction is between 0.01GPa and 5 GPa; in some embodiments, the stiffness of the bend 120 in the first direction is between 0.01GPa and 1 GPa. In some embodiments, the stiffness of the bend 120 in the second direction is between 10GPa and 1000 GPa; in some embodiments, the stiffness of the bend 120 in the second direction is between 10GPa and 800 GPa; in some embodiments, the stiffness of the bend 120 in the second direction is between 10GPa and 500 GPa; in some embodiments, the stiffness of the bend 120 in the second direction is between 10GPa and 300 GPa.

In some embodiments, the flexible display panel 100 may be applied to the display device 1000. In some embodiments, referring to fig. 1, a display device 1000 may include a flexible display panel 100 and a rotation shaft 200. In some embodiments, the display device 1000 may have a display screen with a variable area. In some embodiments, the display area 101 of the flexible display panel 100 presented in the user's field of view may serve as a display screen for the display device 1000. In some embodiments, a portion or all of the bending portion 120 of the flexible display panel 100 is received in a receiving area of the display device 1000 after being bent around the rotation shaft 200, wherein a portion of the bending portion 120 located on the rotation shaft 200 and located in the receiving area is not visible to a user, and a portion located outside the receiving area and the rotation shaft 200 is visible to the user. In some embodiments, the display areas corresponding to the portions of the non-curved portion 110 and the curved portion 120 visible to the user may be used as a display screen of the display device 1000. In some embodiments, the curved portion 120 of the flexible display panel 100 may be pulled out of the receiving area (e.g., the back surface of the non-curved portion 110) through the rotation axis 200 in the first direction, selectively presented in the field of view of the user as an extended display area, become part of the display screen of the display device 1000, and expand the area of the display screen. In some embodiments, the curved portion 120 may also be rolled into the back of the non-curved portion 110 via the rotation shaft 200 for storage, and the area of the display screen is reduced. In some embodiments, when the bending part 120 is bent and received at the rear surface of the flexible display panel 100, the portion of the display area is not observed by the user, and the portion of the display area may be set to a rest state; when the bending part 120 is pulled out to the front surface of the flexible display panel 100 around at least a portion of the rotation shaft 200, the portion of the display area returning to the front surface may be converted into a bright screen state and display contents, thereby increasing the area of the display area that can be seen by the user.

In some embodiments, the display apparatus 1000 may include a first rotation axis and a second rotation axis that are relatively distributed. In some embodiments, the flexible display panel 100 may include a non-bent portion, and first and second bent portions distributed at both sides of the non-bent portion in the first direction. In some embodiments, the first and second bending portions may be respectively bent around the first and second rotation axes to be received in the internal space of the display apparatus 1000, and respectively pulled out from the receiving areas thereof through the first and second rotation axes when the extended display is required.

In some embodiments, referring to fig. 2, the flexible display panel 100 may include: a display layer 10, a first group of layers 20, and a second group of layers 30, wherein the first group of layers 20 is located above the display layer 10 and the second group of layers 30 is located below the display layer. The upper and lower directions referred to herein indicate directions with respect to the front and rear surfaces of the display surface of the non-bent portion 110 of the flexible display panel 100, the direction in which the front surface of the display surface of the flexible display panel 100 is located is up, and the direction in which the rear surface of the display surface of the flexible display panel 100 is located is down.

In some embodiments, the display layer 10 is used to display images. In some embodiments, the types of display devices in display layer 10 for image display may include, but are not limited to: organic light emitting diodes (Organic Light Emitting Diode, OLED), light emitting diodes (Light Emitting Diode, LED), micro light emitting diodes (Micro Light Emitting Diode, micro LED), sub-millimeter light emitting diodes (Mini Light Emitting Diode, mini LED), and the like.

In some embodiments, the display layer 10 may be a multi-layer structure. In some embodiments, the display layer 10 may include a display device layer, an array structure layer, a flexible substrate. The sequence of each layer is, from bottom to top, a flexible substrate, an array structure layer, and a display device layer, that is, the display device layer may be located at the uppermost layer of the display layer 10, the array structure layer may be located between the display device layer and the flexible substrate, and the flexible substrate may be located at the bottommost layer of the display layer 10. In some embodiments, the display device layer may include a light-emitting film layer. In some embodiments, the display device layer may include an organic light emitting diode (Organic Light Emitting Diode, OLED) light emitting layer including a plurality of pixel cells arranged in an array that emit light to enable the display device layer to display an image. In some embodiments, the array structure layer may be used to provide display-related control devices for the display device layer. In some embodiments, the array structure layer may include pixel driving circuits electrically linked to the display device layer 3 for controlling the display image of the display device layer. In some embodiments, the pixel drive circuit may include, but is not limited to, TFT (Thin Film Transistor) devices, capacitive devices, and the like. In some embodiments, the flexible substrate may be a substrate film layer of the display layer 10 for supporting the display device layer and the array structure layer. In some embodiments, the material of the flexible substrate may include, but is not limited to, polyimide (PI) materials, polyethylene terephthalate (Polyethylene terephthalate, PET) materials, polybenzimidazole (PBI) materials, polyetheretherketone (PEEK) materials, polyvinylidene fluoride (Polyvinylidene fluoride, PVDF) materials, polyether Plastic (PPS) materials, and any combination of the foregoing. In some embodiments, the mass ratio of polyimide in the several combined materials of the flexible substrate is 50% -100%; in some embodiments, the mass ratio of polyimide in several combined materials of the flexible substrate is 60% -90%. In some embodiments, the mass ratio of polyethylene terephthalate is 0 to 20%; in some embodiments, the mass ratio of polyethylene terephthalate is 0 to 10%; in some embodiments, the polyethylene terephthalate is present in an amount of 0 to 4% by mass. In some embodiments, the mass ratio of polybenzimidazole is 0-30%; in some embodiments, the mass ratio of polybenzimidazole is 5% to 20%; in some embodiments, the polyether ether ketone is present in an amount of 0 to 4% by mass. In some embodiments, the polyvinylidene fluoride is present in a mass ratio of 0 to 10%; in some embodiments, the polyvinylidene fluoride is present in an amount of 0 to 5% by mass. In some embodiments, the polyether plastic comprises 0-10% by mass; in some embodiments, the polyether plastic comprises 0 to 5% by mass.

In some embodiments, the first layer group 20 may include a cover protection layer 21 and a first adhesive layer 22, wherein the cover layer 21 is adhered to the upper surface of the display layer 10 through the first adhesive layer 22. In some embodiments, cover sheet layer 21 may be used to prevent damage to display layer 10 during use. In some embodiments, the cover sheet layer 21 may be made of a material having both flexibility, high hardness, and high light transmittance. In some embodiments, the material of the cover sheet layer 21 may include, but is not limited to, polyimide (PI) material, colorless Polyimide (Colorless Polyimide, CPI) material, optical poly (Polyethylene terephthalate, PET) plastic, aramid (Nomex) material, and Ultra-thin flexible glass (UTG) material. In some embodiments, the first adhesive layer 22 may be an adhesive material having high light transmittance. In some embodiments, the first adhesive layer 22 may be an optically clear adhesive (Optically Clear Adhesive, OCA).

In some embodiments, the first layer group 20 may further include an optical film layer (not shown) for assisting the display layer 10 in displaying images. In some embodiments, the optical film layer may include a polarizer. In some embodiments, a polarizer may be disposed between the cover sheet layer 21 and the display layer 10, and bonded to the display layer 10 by a glue material (e.g., OCA) having high light transmittance.

In some embodiments, the first layer group 20 may further include a touch layer (not shown in the figure) for receiving a touch operation of a user, so as to implement a function of performing a touch operation on an image displayed on the display layer 10 by the user. In some embodiments, the touch layer may be disposed between the cover plate layer 21 and the display layer 10, and adhered to the display layer 10 by a glue material (e.g., OCA) with high light transmittance. In some embodiments, the touch layer may include a touch device for enabling a user to touch the flexible display panel 100. In some embodiments, the touch layer may include a non-contact sensing device for enabling a user to control the flexible display panel 100 through a related gesture.

In some embodiments, the first layer group 20 may further include a polarizer and a touch layer, where the touch layer may be disposed on the upper surface of the display layer 10, the polarizer is disposed on the upper surface of the touch layer, and the flexible cover plate is disposed on the upper surface of the polarizer. In some embodiments, the film layers of the flexible display panel 100 may be bonded by a glue material (e.g., OCA) having high light transmittance.

In some embodiments, the second layer group 30 may include a support layer 31 and a second adhesive layer 32, wherein the support layer 31 is adhered to the lower surface of the display layer 10 through the second adhesive layer 32. In some embodiments, the support layer 31 may be used to support the display layer 10, increasing the rigidity of the flexible display panel 100. In some embodiments, the support layer 31 may comprise a rigid material. In some embodiments, the rigid material may be a material having a higher young's modulus. In some embodiments, the Young's modulus may range from xx to xx; preferably, xx to xx; further preferably, xx to xx may be used. In some embodiments, the rigid material may include, but is not limited to, steel sheets, alloys, and flexible glass. In some embodiments, the second adhesive layer 32 may include, but is not limited to, pressure sensitive adhesive (Pressure sensitive adhesive, PSA), optically Clear Adhesive (OCA), photosensitive adhesive, heat sensitive adhesive, and the like.

In some embodiments, second layer group 30 may also include a buffer film layer. In some embodiments, the buffer film layer may be used to provide a buffer effect for the display layer 10, reducing the influence of the display layer 10 when impacted by external forces. In some embodiments, the buffer film layer may be bonded to the display layer 10 and other film layers in the second layer set 30 by glue. For example, the buffer film layer may be adhered between the lower surface of the display layer 10 and the upper surface of the support layer 31 by a pressure sensitive adhesive. In some embodiments, the material of the buffer film layer may include foam, XX, or XX. In some embodiments, the adhesive material used to adhere the buffer film layer may include, but is not limited to, pressure Sensitive Adhesive (PSA), optically Clear Adhesive (OCA), photosensitive adhesive, heat sensitive adhesive, and the like.

Since the flexible display panel 100 and the display layer 10 are both of a multi-layer structure, when the bending portion 120 of the flexible display panel 100 bends around the rotation axis 200, the bending stress of each film layer of the multi-layer structure is different due to different bending radii, and the bending stress of the film layer close to the rotation axis 200 is larger than the bending stress of the film layer far from the rotation axis 200. Therefore, the flexible display panel 100 and the display layer 10 thereof are prone to a film dislocation or a film splitting phenomenon during bending.

In some embodiments, the occurrence of the phenomenon of the film dislocation in the display layer 10 can be prevented by increasing the bonding strength between the film layers in the display layer 10. In some embodiments, to increase the bonding strength between the film layers in the display layer 10 and reduce the possibility of occurrence of film dislocation, the flexible display panel 100 may include a cladding member 40 for cladding and reinforcing the display layer 10, enhancing the bonding force between the film layers of the display layer 10 and between the display layer 10 and other film layers, and limiting the dislocation and movement thereof.

In some embodiments, referring to fig. 3, the flexible display panel 100 may further include a covering member 40 for covering at least a portion of at least one of the display layer 10, the first layer group 20, and the second layer group 30. In some embodiments, the covering member 40 may cover at least a partial region of the display layer 10. In some embodiments, the cladding member 40 may cladding a portion of the display layer 10 corresponding to the curved portion 120. In some embodiments, the cover 40 may entirely cover the display layer 10. In some embodiments, the cladding member 40 may cover the edges of the display layer 10. In some embodiments, the edges of the display layer 10 may correspond to non-display areas of the flexible display panel 100. The non-display area refers to an area of the flexible display panel 100 having no image display function.

In some embodiments, the cladding member 40 may simultaneously cover at least a portion of the display layer 10 and the first layer set 20. In some embodiments, the cladding 40 may cladding the edges of the first group of layers 20. In some embodiments, the cladding member 40 may integrally cladding the display layer 10 and the first layer group 20. In some embodiments, the cladding member 40 may only cover portions of the display layer 10 and the first layer group 20 corresponding to the bent portion 120. In some embodiments, the sheathing member 40 may cover only a portion of the edges of the display layer 10 and the first layer group 20 corresponding to the non-display area of the flexible display panel 100.

In some embodiments, the cladding member 40 may simultaneously cover at least a portion of the display layer 10 and the second layer set 30. In some embodiments, cladding 40 may clad the edges of first layer group 30. In some embodiments, the cladding member 40 may integrally cladding the display layer 10 and the second layer group 30. In some embodiments, the cladding member 40 may only cover portions of the display layer 10 and the second layer group 30 corresponding to the bent portion 120. In some embodiments, the sheathing member 40 may cover only a portion of the edges of the display layer 10 and the second layer group 30 corresponding to the non-display region of the flexible display panel 100.

In some embodiments, the sheathing member 40 may be formed of an inner film layer of the flexible display panel 100. In some embodiments, the wrapper 40 may be formed from the first adhesive film layer 22. In some embodiments, the covering 40 may be formed from the second adhesive layer 32. In some embodiments, the encasement 40 can be formed from a buffer film layer.

In some embodiments, referring to fig. 4, the wrapper 40 may include an overlap portion 42 and a wrap portion 43. In some embodiments, the overlap portion 42 may be a portion of the film layer forming the wrapper 40 that overlaps the upper surface of the first set of layers 20 or the lower surface of the second set of layers 30. In some embodiments, the encapsulation portion 43 may be a portion of the film layer forming the covering member 40 that is located outside the display layer 10 in the second direction. In some embodiments, the wrapper 40 may not include the overlap portion 42, but only the envelope portion 43. In some embodiments, the covering member 40 may be formed by joining the first adhesive film layer 22 and the second adhesive film layer 32 to each other, and the portion for joining the first adhesive film layer 22 and the second adhesive film layer 32 is the encapsulation portion 43 of the covering member 40.

In some embodiments, the inner surface of the overburden portion 42 is tacky and the outer surface is non-tacky, where the inner surface of the overburden portion 42 refers to the surface of the overburden portion 42 that contacts the upper surface of the first group of layers 20 or the lower surface of the second group of layers 30 and the surface opposite thereto is the outer surface of the overburden portion 42. In some embodiments, the outer surface of the envelope portion 43 is non-tacky, wherein the outer surface of the envelope portion 43 refers to the surface of the envelope portion 43 facing away from the display layer 10, and the surface of the envelope portion 43 facing toward the display layer 10 is the inner surface. In some embodiments, the inner surface of the envelope portion 43 may or may not be tacky. In some embodiments, the non-tacky surface of the encasement 40 can be obtained by a curing process. In some embodiments, the covering member 40 is formed of an adhesive film layer (e.g., the first adhesive film layer 22 or the second adhesive film layer 32), and after the covering member 40 is formed of the adhesive film layer, the adhesive material of the outer surface portions of the overlapping portion 42 and the sealing portion 43 may be subjected to a surface curing treatment to obtain a non-adhesive surface. In some embodiments, the non-tacky surface of the covering 40 may be obtained by not coating the glue. In some embodiments, the covering 40 is formed of a non-adhesive film layer (e.g., a buffer film layer), and the portions of the non-adhesive film layer corresponding to the outer surfaces of the overlap portion 42 and the envelope portion 43 may not be coated with a glue. In some embodiments, after the adhesive layer forms the covering member 40, the overlapping portion 42 and the wrapping portion 43 may be integrally cured to increase the strength of the overlapping portion 42 and the wrapping portion 43, thereby improving the covering effect of the covering member 40. In some embodiments, the adhesive layer may not be cured after forming the covering member 40, so that the covering member 40 maintains higher flexibility and improves the cushioning performance.

In some embodiments, the first layer set 20 may include the cover sheet layer 21 and the first adhesive film layer 22, and the second layer set 30 may include the support layer 31 and the second adhesive film layer 32. Referring to fig. 4A, the flexible display panel 100 includes, from top to bottom, a cover sheet layer 21, a first adhesive film layer 22, a display layer 10, a second adhesive film layer 32, and a support layer 31, respectively. In some embodiments, the first layer group 20 may also include an optical film layer (not shown). In some embodiments, an optical film layer may be disposed between the first adhesive film layer 22 and the display layer 10. In some embodiments, the optical film layer may include a Polarizer (POL). In some embodiments, the first layer group 20 may also include a touch layer (not shown). In some embodiments, the touch layer may be disposed between the first adhesive layer 22 and the display layer 10. In some embodiments, the first layer group 20 may also include both an optical film layer and a touch layer. In some embodiments, an optical film layer may be disposed between the first adhesive film layer 22 and the touch layer, which may be disposed between the optical film layer and the display layer 10. In some embodiments, the flexible display panel 100 includes, from top to bottom, a cover sheet layer 21, a first adhesive film layer 22, an optical film layer, a touch control layer, a display layer 10, a second adhesive film layer 32, and a support layer 31, respectively.

In some embodiments, referring to fig. 4, the flexible display panel 100 may further include a cover 40 formed from the first adhesive film layer 22. In some embodiments, the first adhesive layer 22 may cover at least a portion of the display layer 10 and the second layer group 30 to form the cover 40. In some embodiments, the first adhesive layer 22 may encapsulate the optical film layer, the display layer 10, and at least a portion of the second layer group 30 to form an encapsulation 40. In some embodiments, the first adhesive layer 22 may cover at least a portion of the touch layer, the display layer 10, and the second layer group 30 to form the cover 40. In some embodiments, the first adhesive layer 22 may cover at least portions of the optical film layer, the touch layer, the display layer 10, and the second layer group 30 to form the cover 40. In some embodiments, the wrapper 40 may include an overlap portion 42 and a wrap portion 43. In some embodiments, the overlay portion 42 is located on the lower surface of the support layer 31 and the envelope portion 43 is located outside the display layer 10 along the predetermined axis 130. In some embodiments, the wrapping member 40 may wrap on either side of the flexible display panel 100 along the second direction. In some embodiments, the wrapping member 40 may also wrap both sides of the flexible display panel 100 along the second direction.

In some embodiments, referring to fig. 4A and 4B, the first adhesive layer 22 has an extension 221 having a length exceeding the length of the corresponding display layer 10 along the second direction (the direction parallel to the predetermined axis 130), and the extension 221 extends partially to the lower surface of the second layer group 30, so that the first adhesive layer 22 extends partially, and the extension constitutes the covering member 40. In some embodiments, the portion of the extension 221 that extends to the lower surface of the second group of layers 30 may form an overlapping portion 42 of the wrapper 40. In some embodiments, the portion of the extension 221 that does not extend to the lower surface of the second layer set 30 forms an encapsulation portion 43 of the encapsulation 40 for encapsulating the film layer between the first adhesive film layer 22 and the overlying portion 42. The film layer between the first adhesive film layer 22 and the overlapped portion 42 included in the encapsulation portion 43 is referred to as an encapsulated film layer. In some embodiments, the film encapsulated by the encapsulation portion 43 (i.e., encapsulated film) may include the display layer 10, the second adhesive film 32, and the support layer 31. In some embodiments, the encapsulated film layer may include an optical film layer, a display layer 10, a second adhesive film layer 32, and a support layer 31. In some embodiments, the encapsulated film layer may include a touch layer, a display layer 10, a second adhesive film layer 32, and a support layer 31. In some embodiments, the encapsulated film layer may include an optical film layer, a touch control layer, a display layer 10, a second adhesive film layer 32, and a support layer 31.

In some embodiments, referring to fig. 4A, there may be some gap between the encapsulation portion 43 and the encapsulated film layer. In some embodiments, the gap between the wrapping portion 43 and the wrapped film layer may enable the wrapped film layers to have a small amount of dislocation between the film layers to release part of the bending stress when the wrapped film layers are subjected to the bending stress, and the connection effect of the wrapping portion 43 on the film layers may prevent the wrapped film layers from separating, so that the film layers may have a small amount of dislocation without separating the film layers, and the wrapping member 40 provided in this manner may compromise the effect of stress release and reinforcement connection between the film layers. In some embodiments, referring to fig. 4B, the wrapping portion 43 may also be directly attached to the outer side of the wrapped film, i.e. there is no gap between the wrapping portion 43 and the wrapped film. In some embodiments, the encapsulation portion 43 is attached to the outer side of the encapsulated film layer to improve the encapsulation strength of the encapsulated film layer.

Length L of the overlap portion 42 in the second direction ₁ Depending on the material properties and bonding of the wrapping 40Is a strength of (a) is a strength of (b). Generally, the overlap 42 is too long, resulting in wasted material and may affect the performance of the display because of the extra thickness created by the overlap. Too short an overlap 42 may result in insufficient bond strength and loss of meaning of the overlap. To avoid the effect of the overlap portion 42 on the display performance as much as possible, the overlap portion 42 should overlap the non-display area of the flexible display panel 100 as much as possible, i.e. the overlap portion 42 should avoid extending below (or above) the display area as much as possible. In some embodiments, the length L of the overlap portion 42 in the second direction ₁ I.e. corresponds to the width of the edges of the second layer group 30 that are coated by the coating 40. Referring to FIG. 5, in some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1mm and 4 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1mm and 2 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1.5mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1.5mm and 4 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1.5mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 1.5mm and 2 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 2mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 3mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 4mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 2mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 2mm and 4 mm. In some embodimentsIn the example, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₁ Between 3mm and 4 mm.

The thickness of the overlap 42 depends on the material properties of the wrapper 40 and the strength of the bond. In general, the overlap 42 is too thick and may affect the performance of the display. Too thin an overlap 42 may result in loss of meaning of the wrapper 40 due to insufficient material strength. Referring to FIG. 5, in some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.025mm and 0.5 mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.025mm and 0.4 mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.025mm and 0.3 mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.025mm and 0.2 mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.025mm and 0.1mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.03mm and 0.1mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.035mm and 0.1mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.04mm and 0.1mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.045mm and 0.1mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ Between 0.05mm and 0.1mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ May be 0.05mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₁ May be 0.1mm.

In some embodiments, the material of the first adhesive layer 22 may be an adhesive material having a higher light transmittance. In some embodiments, the material of the first adhesive layer 22 may include Optically Clear Adhesive (OCA). In some embodiments, the material of the first adhesive layer 22 may also include an accelerator or catalyst to aid in adhesive bonding. In some embodiments, the first adhesive layer 22 may use OCA as the main adhesive material, with the addition of an appropriate amount of accelerator. In some embodiments, the ratio of the primary gel to the accelerator may be between 95:5 and 99.999:0.001.

In some embodiments, referring to fig. 6, the cover 40 of the flexible display panel 100 may be manufactured by a process 600:

in step 610, a second adhesive layer 32 is laid on the upper surface of the supporting layer 31.

In some embodiments, the support layer 31 may be a sheet-like rigid material. In some embodiments, the support layer 31 may be a steel sheet or other rigid material of similar properties. In some embodiments, the thickness of the rigid material may be between 0.03mm and 1 mm. In some embodiments, the thickness of the rigid material may be between 0.03mm and 0.7 mm. In some embodiments, the thickness of the rigid material may be between 0.03mm and 0.2 mm. In some embodiments, the thickness of the rigid material may be between 0.03mm and 0.1 mm. In some embodiments, the thickness of the rigid material may be between 0.03mm and 0.3 mm. In some embodiments, the thickness of the rigid material may be between 0.03mm and 0.4 mm. In some embodiments, the thickness of the rigid material may be between 0.03mm and 0.5 mm. In some embodiments, the thickness of the rigid material may be between 0.08 and 0.12 mm. In some embodiments, the thickness of the rigid material may be between 0.28 and 0.32 mm. In some embodiments, the thickness of the rigid material may be between 0.38 and 0.42 mm. In some embodiments, the thickness of the rigid material may be between 0.48 and 0.52 mm.

In some embodiments, the second adhesive layer 32 may be a film-like adhesive material. In some embodiments, the second adhesive layer 32 may be a film-like pressure-sensitive adhesive. In some embodiments, the thickness of the glue is between 0.025mm and 0.5 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.4 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.3 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.2 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.1 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.05 mm.

In some embodiments, the shape and area of the bonding surfaces of the support layer 31 and the second adhesive film layer 32 are as identical as possible. In some embodiments, the support layer 31 and the second adhesive layer 32 may be rectangular in shape.

At step 620, the display layer 10 is laid on the upper surface of the second adhesive layer 32.

In some embodiments, the bonding surfaces of the display layer 10 and the second adhesive film layer 32 have as identical a shape and area as possible. In some embodiments, the second adhesive layer 32 may be slightly smaller than the display layer 10. In some embodiments, the distance between each edge of the second adhesive layer 32 and each edge of the display layer 10 may be between 0.001mm and 0.01 mm. In some embodiments, the shape of the display layer 10 may be rectangular. In some embodiments, the display layer 10 may have a stiffness in the direction along its long side that is less than the stiffness in the direction along its short side, such that at least a portion of the display layer 10 is capable of bending in the direction along its long side. In some embodiments, the display layer 10 may also have a stiffness along its long side that is greater than the stiffness along its short side, so that at least a portion of the display layer 10 is able to bend along its short side.

In step 630, a first adhesive layer 22 is laid on the display layer 10, the first adhesive layer 22 having an extension 221 with respect to the display layer 10.

In some embodiments, the first adhesive layer 22 may be a film-like adhesive material. In some embodiments, the first adhesive film layer 22 may be a film-like Optically Clear Adhesive (OCA). In some embodiments, the thickness of the glue is between 0.025mm and 0.5 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.4 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.3 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.2 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.1 mm. In some embodiments, the thickness of the glue is between 0.025mm and 0.05 mm.

In some embodiments, the first adhesive layer 22 has a larger area than the display layer 10. In some embodiments, the display layer 10 may be curved along a direction in which a long side thereof is located, and the first adhesive film layer 22 has a greater width than the display layer 10 in a direction in which a short side of the display layer 10 is located. In some embodiments, after the first adhesive layer 22 is adhered to the display layer 10, the extending portions 221 have the same size at both ends of the display layer 10 in the direction of the short side. In some embodiments, the extension 221 may be disposed at only one end of the display layer 10 in the direction of the short side. In some embodiments, the display layer 10 may be curved along a direction along a short side thereof, and the first adhesive film layer 22 has a greater width than the display layer 10 along a long side of the display layer 10. In some embodiments, the extension 221 may be located at two ends or one end of the display layer 10 in the direction of the long side.

In some embodiments, an optical film layer and/or a touch layer may also be laid on the display layer 10 before the first adhesive film layer 22 is laid on the display layer 10, and the first adhesive film layer 22 is laid on the upper surface of the optical film layer or the touch layer.

Step 640, laying up the cover sheet layer 21 on the first adhesive layer 22.

In some embodiments, cover sheet layer 21 and display layer 10 have the same shape and area. In some embodiments, the cap layer 21 may be CPI film layer coated.

At step 650, the extension 221 is turned down and adhered to the lower surface of the support layer 31.

In some embodiments, extension 221 forms overlap portion 42 and envelope portion 43 after extension 221 is flip-down bonded to the lower surface of support layer 31. In some embodiments, the operator may further cure the outer surfaces of overlap portion 42 and envelope portion 43 such that the outer surfaces of overlap portion 42 and envelope portion 43 are not tacky.

In some embodiments, the first layer set 20 may include the cover sheet layer 21 and the first adhesive film layer 22, and the second layer set 30 may include the support layer 31 and the second adhesive film layer 32. Referring to fig. 7, the flexible display panel 100 includes, from top to bottom, a cover sheet layer 21, a first adhesive film layer 22, a display layer 10, a second adhesive film layer 32, and a support layer 31, respectively. In some embodiments, the flexible display panel 100 may further include a cover 40 formed of the second adhesive film layer 32. In some embodiments, the second adhesive layer 32 may cover the display layer 10 and at least a portion of the first layer set 20 to form a cover 40. In some embodiments, the wrapper 40 may include an overlap portion 42 and a wrap portion 43. In some embodiments, the overlap portion 42 is located on the upper surface of the cover sheet layer 21 and the envelope portion 43 is located outside the display layer 10 in the second direction. In some embodiments, the wrapping member 40 may wrap on either side of the flexible display panel 100 along the second direction. In some embodiments, the wrapping member 40 may also wrap both sides of the flexible display panel 100 along the second direction.

In some embodiments, referring to fig. 7, the second adhesive layer 32 has an extension 321 having a length exceeding the length of the corresponding display layer 10 in a direction parallel to the predetermined axis 130, and the extension 321 extends partially to the upper surface of the first layer group 20, so that the second adhesive layer 32 extends partially, and the extension constitutes the covering member 40. In some embodiments, the portion of the extension 321 that extends to the upper surface of the first group of layers 20 may form an overlapping portion 42 of the wrapper 40. In some embodiments, the portion of the extension 321 that does not extend to the upper surface of the first layer set 20 forms an encapsulation portion 43 of the encapsulation 40 for encapsulating the film layer between the second adhesive film layer 32 and the overlying portion 42. In some embodiments, the film layer enclosed by the enclosing portion 43 may include the display layer 10 and all the film layers in the first layer group 20.

Length L of the overlap portion 42 in the second direction ₂ Depending on the material properties of the wrapper 40 and the strength of the bond. In some embodiments, the length L of the overlap portion 42 in the second direction ₂ I.e. corresponds to the width of the edges of the first layer group 20 that are coated by the coating 40. Referring to FIG. 8, in some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 0.7mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 0.7mm and 2.5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 0.7mm and 2 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 0.7mm and 1.5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 1mm and 3 mm. In some embodiments, the overlapping portion of wrapper 4042 length in the second direction L ₂ Between 1mm and 2.5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 1mm and 2 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 1.5mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 1.5mm and 2.5 mm. In some embodiments, the length L of the overlapping portion 42 of the wrapper 40 in the second direction ₂ Between 2mm and 2.5 mm.

Referring to FIG. 8, in some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₂ Between 0.025mm and 0.5 mm. In some embodiments, the thickness h of the overlapping portion 42 of the wrapper 40 ₂ Thickness h of overlap portion 42 as in other embodiments of the present application ₁ Is of similar size, thickness h of overlying portion 42 ₂ Reference is made to the description of fig. 5 of the present application, and details thereof are not repeated here.

In some embodiments, the material of the second adhesive layer 32 may include any one or a combination of Pressure Sensitive Adhesive (PSA), optically Clear Adhesive (OCA), photosensitive adhesive, and heat sensitive adhesive. In some embodiments, the material of the second adhesive layer 32 may also include an accelerator or catalyst to aid in adhesive bonding.

In some embodiments, referring to fig. 9, the cover 40 of the flexible display panel 100 may be manufactured by a process 900:

in step 910, a second adhesive layer 32 is laid on the upper surface of the supporting layer 31.

In some embodiments, the support layer 31 may be a sheet-like rigid material. In some embodiments, the support layer 31 may be a steel sheet or other rigid material of similar properties. The relevant dimensional parameters of the rigid material may be found in the description of fig. 6 of the present application and are not described in detail herein. In some embodiments, the second adhesive layer 32 may be a film-like adhesive material. In some embodiments, the second adhesive layer 32 may be a film-like adhesive material. In some embodiments, the second adhesive layer 32 may be a film-like pressure-sensitive adhesive. The thickness dimension parameter of the adhesive material can be referred to in the related description of fig. 6 of the present application, and is not described herein.

In step 920, the display layer 10 is laid on the upper surface of the second adhesive layer 32, and the second adhesive layer 32 has an extension 321 with respect to the display layer 10.

In some embodiments, the shape and area of the display layer 10 and the support layer 31 are as identical as possible. In some embodiments, the shape of the display layer 10 may be rectangular. In some embodiments, the display layer 10 may have a stiffness in the direction along its long side that is less than the stiffness in the direction along its short side, such that at least a portion of the display layer 10 is capable of bending in the direction along its long side. In some embodiments, the display layer 10 may also have a stiffness along its long side that is greater than the stiffness along its short side, so that at least a portion of the display layer 10 is able to bend along its short side.

In some embodiments, the second adhesive layer 32 has a larger area than the display layer 10 and the support layer 31. In some embodiments, the display layer 10 may be curved along a direction in which a long side thereof is located, and the second adhesive film layer 32 has a greater width than the display layer 10 in a direction in which a short side of the display layer 10 is located. In some embodiments, after the second adhesive film layer 32 is adhered to the display layer 10, the extending portions 321 have the same size at both ends of the display layer 10 in the direction of the short side. In some embodiments, the extension 321 may be only located at one end of the display layer 10 in the direction of the short side. In some embodiments, the display layer 10 may be curved along a direction along a short side thereof, and the second adhesive film layer 32 has a greater width than the display layer 10 along a long side of the display layer 10. In some embodiments, the extension 321 may be located at two ends, or one of the two ends, of the display layer 10 in the direction of the long side.

At step 930, a first adhesive layer 22 is laid over the display layer 10.

In some embodiments, the first adhesive layer 22 may be a film-like adhesive material. In some embodiments, the first adhesive layer 22 may be a film-like Optically Clear Adhesive (OCA), and the thickness dimension parameter of the optically clear adhesive may be described elsewhere in the present application, which is not described herein.

In some embodiments, the first adhesive layer 22 is as identical in shape and area as the display layer 10. In some embodiments, the first adhesive layer 22 may be slightly smaller than the display layer 10. In some embodiments, the distance between each edge of the first adhesive layer 22 and each edge of the display layer 10 may be between 0.001mm and 0.01 mm.

In some embodiments, an optical film layer and/or a touch layer may also be laid over the display layer 10 before the first adhesive film layer 22 is laid over the display layer 10.

Step 940, laying up the cover sheet layer 21 on the first adhesive film layer 22.

In some embodiments, the cover sheet layer 21 and the display layer 10 are as identical in shape and area as possible. In some embodiments, the cap layer 21 may be CPI film layer coated.

In step 950, the extension 321 is turned upwards and adhered to the upper surface of the cover layer 21.

In some embodiments, extension 321 forms overlap portion 42 and envelope portion 43 after extension 321 is flip-up bonded to the upper surface of cover sheet 21. In some embodiments, the operator may further cure the outer surfaces of overlap portion 42 and envelope portion 43 such that the outer surfaces of overlap portion 42 and envelope portion 43 are not tacky.

In some embodiments, the first layer set 20 may include the cover sheet layer 21 and the first adhesive film layer 22, and the second layer set 30 may include the support layer 31 and the second adhesive film layer 32. Referring to fig. 10, the flexible display panel 100 includes, from top to bottom, a cover sheet layer 21, a first adhesive film layer 22, a display layer 10, a second adhesive film layer 32, and a support layer 31, respectively. In some embodiments, the flexible display panel 100 may further include a cover 40 formed from the first and second adhesive layers 22 and 32. In some embodiments, the first and second adhesive layers 22, 32 may be joined to each other to encapsulate at least a portion of the display layer 10 to form the encasement 40. In some embodiments, the wrapper 40 may include a wrapping portion 43. In some embodiments, the wrapping member 40 may wrap on either side of the flexible display panel 100 along the second direction. In some embodiments, the wrapping member 40 may also wrap both sides of the flexible display panel 100 along the second direction.

In some embodiments, referring to fig. 10, the first adhesive layer 22 has a first extension 222 having a length exceeding the length of the corresponding display layer 10 in a second direction (a direction parallel to the predetermined axis 130), the second adhesive layer 32 has a second extension 322 having a length exceeding the length of the corresponding display layer 10 in a direction parallel to the predetermined axis 130, and the first extension 222 and the second extension 322 are engaged with each other such that the first adhesive layer 22 and the second adhesive layer 32 together form the covering member 40. In some embodiments, the joined portions of the first and second extensions 222, 322 constitute the encapsulation portion 43 of the wrapper 40 for encapsulating the film layer between the first and second adhesive film layers 22, 32. In some embodiments, the film layer enclosed by the enclosing portion 43 may include the display layer 10 and all the film layers in the first layer group 20.

In some embodiments, the materials of the first and second adhesive layers 22, 32 may be the same. In some embodiments, the first and second adhesive layers 22, 32 may include optically clear adhesive. In some embodiments, the first and second adhesive layers 22, 32 may be two different portions on one complete adhesive layer (e.g., OCA film layer). In some embodiments, the complete adhesive film layer may be folded over to form two different film layer planes. In some embodiments, two different film planes may form the first and second adhesive film layers 22 and 32, respectively, that are layered between the other film layers of the flexible display panel 100. In some embodiments, the complete adhesive layer may form the envelope portion 43 of the covering member 40 by folding over the joined portion located outside the display layer 10.

In some embodiments, referring to fig. 11, the cover 40 of the flexible display panel 100 may be manufactured by a process 1100:

in step 1110, an adhesive film layer is laid on the upper surface of the supporting layer 31, and the adhesive film layer extends out of the supporting layer 31 in at least one direction.

In some embodiments, the support layer 31 may be a sheet-like rigid material. In some embodiments, the support layer 31 may be a steel sheet or other rigid material of similar properties. The relevant dimensional parameters of the rigid material may be found in the description of fig. 6 of the present application and are not described in detail herein. In some embodiments, the adhesive film layer laid on the upper surface of the support layer 31 may be an Optically Clear Adhesive (OCA) film layer having tackiness on both sides. In some embodiments, the adhesive film layer may extend in the short side direction of the support layer 31 by a portion having a width greater than or equal to the short side width of the support layer 31, and have sides having the same length as the support layer 31 in the long side direction of the support layer 31. In some embodiments, the adhesive film layer may extend in the long side direction of the support layer 31 by a portion having a width greater than or equal to the long side width of the support layer 31, and have sides having the same length as the support layer 31 in the short side direction of the support layer 31.

In step 1120, the display layer 10 is laid on the upper surface of the adhesive film layer.

In some embodiments, the display layer 10 and the support layer 31 are as identical in shape and area as possible, the adhesive film layer having a portion extending beyond a short or long side thereof with respect to the display layer 10.

In some embodiments, the portion of the adhesive film layer between the display layer 10 and the support layer 31 may form the second adhesive film layer 32 of the flexible display panel 100.

In step 1130, the portion of the adhesive film layer extending beyond the supporting layer 31 is folded over and adhered to the upper surface of the display layer 10.

In some embodiments, the portion of the adhesive film layer adhered to the upper surface of the display layer 10 may form the first adhesive film layer 22 of the flexible display panel 100. In some embodiments, the cover 40 is formed after the portion of the adhesive film layer extending beyond the support layer 31 is folded over and adhered to the upper surface of the display layer 10. The cover member 40 may cover the display layer 10 therebetween by forming the first and second adhesive layers 22 and 32 to be bonded to each other. The joint portion of the first adhesive film layer 22 and the second adhesive film layer 32 is located outside the display layer 10 as the envelope portion 43 of the envelope 40.

In step 1140, the cover sheet layer 21 is laid over the adhesive film layer on the upper surface of the display layer 10.

In some embodiments, cover sheet layer 21 and display layer 10 have the same shape and area. In some embodiments, cover sheet layer 21 may include a CPI film layer.

In some embodiments, second layer group 30 may include a buffer film layer. In some embodiments, a buffer film layer may be disposed between the second adhesive film layer 32 and the display layer 10. In some embodiments, a buffer film layer may encapsulate display layer 10 and at least a portion of first layer set 20 to form encapsulation 40.

In some embodiments, the buffer film layer has an extension in the second direction (parallel to the predetermined axis 130) that extends beyond the length of the corresponding display layer 10, the extension extending partially to the upper surface of the first layer group 20, such that the buffer film layer forms the covering 40.

In some embodiments, the portion of the buffer film layer extending to the upper surface of the first layer set 20 constitutes an overlapping portion of the wrapper 40. In some embodiments, the length of the overlap portion in the second direction is between 0.7mm and 3 mm. In some embodiments, the thickness of the overlap is between 0.025mm and 0.5 mm. In some embodiments, the coating 40 formed by the buffer film layer has similar structural shape and dimensional parameters as the coating 40 formed by the second adhesive film layer 32, and the detailed description of fig. 8 of the present application is omitted herein. In some embodiments, the buffer film layer may be a soft material. In some embodiments, the material of the buffer film layer may include, but is not limited to, foam, gel material, or silicone material.

In some embodiments, the risk of misalignment of the display layer 10 may be prevented by reducing the bending stress to which the display layer 10 is subjected when bent. In some embodiments, to reduce bending stress to which the display layer 10 is subjected when bent, the lower surface of the second layer group 20 may include a plurality of bosses 311 disposed to be distributed along the first direction. When the flexible display panel 100 is bent and moved on the rotation shaft 200, the boss 311 is directly contacted with the rotation shaft 200, and the acting force of the rotation shaft 200 on the flexible display panel 100 directly acts on the boss 311. Because a certain gap exists between adjacent bosses 311, the adjacent bosses 311 of the flexible display panel 100 are not mutually extruded when being bent, and bending stress generated during bending can be effectively reduced. In addition, the strain generated by the flexible display panel 100 during bending can be released through the gaps between the bosses 311, so that the strain is prevented from being accumulated in each film layer of the flexible display panel 100 and then further transferred to each film layer of the display layer 10, and therefore the risk of dislocation and splitting of the film layers of the flexible display panel 100 and the display layer 10 in the bending process is reduced.

In some embodiments, referring to fig. 12, the support layer 31 may include a plurality of bosses 311 disposed in a distributed manner. In some embodiments, the plurality of bosses 311 may be machined into the rigid material of the support layer 31. In some embodiments, the support layer 31 may comprise a steel sheet, and the boss 311 may be formed on the steel sheet. In some embodiments, the support layer 31 may be ultra-thin glass, and the boss 311 may be formed on the ultra-thin glass by processing. In some embodiments, after the boss 311 is formed, the surface of the boss 311 may be coated with a glue material, so that the boss 311 can provide a certain buffering effect when being extruded by the rotating shaft. In some embodiments, the rubber material coated on the boss 311 may include, but is not limited to, polyurethane (PU), silicone rubber, thermoplastic polyurethane elastomer (Thermoplastic polyurethanes, TPU), or the like. In some embodiments, the boss 311 may be formed directly by coating the adhesive on the rigid material instead of processing the rigid material of the supporting layer 31, so that the adhesive forms the boss 311.

In some embodiments, the boss 311 may be provided at a lower surface of a region of the support layer 31 corresponding to the bent portion 120. In some embodiments, the bosses 311 may be disposed at regular intervals in a first direction at the back surface of the support layer 31 in a certain distribution. In some embodiments, the distribution of the bosses 311 along the first direction may be regularly spaced. In some embodiments, the bosses 311 may be disposed at regular intervals in the second direction at the lower surface of the support layer 31 in a certain distribution. In some embodiments, the distribution of the bosses 311 in the second direction may be regularly spaced. In some embodiments, the bosses 311 may be distributed at unequal intervals along the second direction. In some embodiments, the bosses 311 may be distributed in the second direction at regions of both ends of the support layer 31 in the direction. In some embodiments, the ratio of the area of the support layer 31 with the bosses 311 distributed at the two ends along the second direction to the total width of the second direction may be between 10% and 60%. In some embodiments, the boss 311 may also be disposed through the lower surface of the support layer 31 along the second direction.

The distribution interval of the bosses 311 depends on the shape of the bosses. In general, too large a distribution interval of the bosses 311 may affect the supporting effect of the supporting layer 31. The sub-intervals of the bosses 311 are too small, and during the bending process of the flexible display panel 100, adjacent bosses may be mutually extruded to generate extrusion force, so that the meaning of the bosses 311 is lost. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm-2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm-1.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm-1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm-1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm-1 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm-0.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.2mm-0.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.3mm-0.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm-0.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm-1 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm-1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm-1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.5mm-1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.5mm-1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.5mm-1 mm. In some embodiments, the distribution interval of the bosses 311 in the first direction may be 0.5mm to 0.8mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.8mm-1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.8mm-1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.8mm-2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1mm-2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1mm-1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1mm-1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1mm-1.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1.2mm-1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1.2mm-1.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1.2mm-2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1.5mm-2 mm.

In some embodiments, the shape of the boss 311 may include hemispherical, tooth-like, and elongated shapes.

In some embodiments, referring to fig. 13, the boss 311 may be hemispherical in shape. In some embodiments, the radius of the hemispherical boss may be between 0.03mm-1 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 1 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.9 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.8 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.7 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.6 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.5 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.4 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.3 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.2 mm. In some embodiments, the radius of the hemisphere may be between 0.03mm and 0.1 mm. In some embodiments, the radius of the hemisphere may be between 0.1mm and 1 mm. In some embodiments, the radius of the hemisphere may be between 0.1mm and 0.7 mm. In some embodiments, the radius of the hemisphere may be between 0.1mm and 0.5 mm. In some embodiments, the radius of the hemisphere may be between 0.1mm and 0.4 mm. In some embodiments, the radius of the hemisphere may be between 0.1mm and 0.3 mm. In some embodiments, the radius of the hemisphere may be between 0.1mm and 0.2 mm. In some embodiments, the radius of the hemisphere may be between 0.3mm and 0.5 mm. In some embodiments, the radius of the hemisphere may be between 0.3mm and 0.4 mm. In some embodiments, the radius of the hemisphere may be between 0.4mm and 0.5 mm.

In some embodiments, the hemispherical bosses may be spaced between 0.1mm and 1mm apart along the first direction. In some embodiments, the hemispherical bosses may be spaced between 0.3mm and 1mm apart along the first direction. In some embodiments, the hemispherical bosses may be spaced between 0.5mm and 1mm apart along the first direction. In some embodiments, the hemispherical bosses may be spaced between 0.5mm and 0.9mm apart along the first direction. In some embodiments, the hemispherical bosses may be spaced between 0.5mm and 0.8mm apart along the first direction. In some embodiments, the hemispherical bosses may be spaced between 0.5mm and 0.7mm apart along the first direction. In some embodiments, the hemispherical bosses may be spaced between 0.6mm and 0.8mm apart along the first direction. In some embodiments, the hemispherical bosses may be spaced between 0.6mm and 1mm apart along the first direction.

In some embodiments, the hemispherical bosses may be spaced between 0.5mm and 4mm apart along the second direction. In some embodiments, the hemispherical bosses may be spaced between 1mm and 4mm apart along the second direction. In some embodiments, the hemispherical bosses may be spaced between 1.5mm and 4mm apart along the second direction. In some embodiments, the hemispherical bosses may be spaced between 2mm and 4mm apart along the second direction. In some embodiments, the hemispherical bosses may be spaced between 2.5mm and 4mm apart along the second direction. In some embodiments, the hemispherical bosses may be spaced between 3mm and 4mm apart along the second direction. In some embodiments, the hemispherical bosses may be spaced between 3.5mm and 4mm apart along the second direction.

In some embodiments, referring to fig. 14, the boss 311 may be shaped as a tooth. In some embodiments, referring to fig. x, the tooth-shaped boss has a trapezoidal cross-section in a plane perpendicular to the predetermined axis 130. In some embodiments, the long side M of the trapezoid is the side closer to the display layer 10, and the short side N of the trapezoid is the side farther from the display layer 10. In some embodiments, the value of the long side M of the trapezoid may be between 1mm-2 mm. In some embodiments, the value of the long side M of the trapezoid may be between 1mm and 1.5 mm. In some embodiments, the value of the long side M of the trapezoid may be between 1.5mm-2 mm. In some embodiments, the value of the short side N of the trapezoid may be between 0.5mm-1 mm. In some embodiments, the value of the short side N of the trapezoid may be between 0.5mm and 0.8 mm. In some embodiments, the value of the short side N of the trapezoid may be between 0.8mm-1 mm. In some embodiments, the value of the short side N of the trapezoid may be between 0.6mm and 0.8 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 1 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 1 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.9 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.8 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.7 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.6 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.5 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.4 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.3 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.2 mm. In some embodiments, the trapezoid may have a value of high L between 0.03mm and 0.1 mm. In some embodiments, the trapezoid may have a value of high L between 0.1mm and 1 mm. In some embodiments, the trapezoid may have a value of high L between 0.1mm and 0.7 mm. In some embodiments, the trapezoid may have a value of high L between 0.1mm and 0.5 mm. In some embodiments, the trapezoid may have a value of high L between 0.1mm and 0.4 mm. In some embodiments, the trapezoid may have a value of high L between 0.1mm and 0.3 mm. In some embodiments, the trapezoid may have a value of high L between 0.1mm and 0.2 mm. In some embodiments, the trapezoid may have a value of high L between 0.3mm and 0.5 mm. In some embodiments, the trapezoid may have a value of high L between 0.3mm and 0.4 mm. In some embodiments, the trapezoid may have a value of high L between 0.4mm and 0.5 mm.

In some embodiments, the tooth-shaped projections may be spaced between 0.5mm and 1mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.5mm and 0.9mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.5mm and 0.8mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.5mm and 0.7mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.5mm and 0.6mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.6mm and 1mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.7mm and 1mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.8mm and 1mm apart along the first direction. In some embodiments, the tooth-shaped projections may be spaced between 0.9mm and 1mm apart along the first direction.

In some embodiments, the distribution intervals of the tooth-shaped bosses along the second direction may be similar to the distribution intervals of the hemispherical bosses along the second direction, and the specific interval size may be referred to in the related description elsewhere in this application, which is not repeated herein.

In some embodiments, the boss 311 is elongated in shape. In some embodiments, the elongated boss may be disposed through the lower surface of the support layer 31 along the second direction. In some embodiments, the lower surface of the supporting layer 31 may also be distributed with a plurality of elongated bosses along the second direction. In some embodiments, the elongated boss has a rectangular cross-section in a plane perpendicular to the predetermined axis 130. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 0.5mm and 3 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 0.5mm and 2.5 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 0.5mm and 2 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 0.5mm and 1.5 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 0.5mm and 1 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 1mm and 3 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 1mm-2.5 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 1mm-2 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 1mm and 1.5 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 1.5mm and 3 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 2mm-3 mm. In some embodiments, the length of the sides of the rectangle in the first direction has a value between 2.5mm and 3 mm. In some embodiments, the high value of the rectangle may be between 0.03mm-1 mm. In some embodiments, the high value of the rectangle may be set similar to the high L of the trapezoid in the tooth-shaped boss, and specific reference may be made to the description elsewhere in this application, which is not repeated here.

In some embodiments, the elongated bosses may be spaced between 1mm and 2mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1.2mm and 2mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1.4mm and 2mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1.6mm and 2mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1.8mm and 2mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1mm and 1.5mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1.5mm and 2mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1mm and 1.8mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1mm and 1.6mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1mm and 1.4mm apart along the first direction. In some embodiments, the elongated bosses may be spaced between 1mm and 1.2mm apart along the first direction.

In some embodiments, the plurality of bosses 311 may be made of additional exterior material and adhered to the lower surface of the support layer 31. In some embodiments, the plurality of bosses 311 may be disposed on an external film layer, and a surface of the external film layer opposite to the boss 311 is adhered to the lower surface of the supporting layer 31, so that the boss 311 is fixed on the lower surface of the supporting layer 31. In some embodiments, the material of the boss 311 may include, but is not limited to, steel sheet, alloy, glass, and any combination thereof. In some embodiments, the adhesive material that bonds the exterior material and the support layer 31 may include, but is not limited to, optically clear adhesive, pressure sensitive adhesive, or heat sensitive adhesive, among others. In some embodiments, the boss 311 made of an external material and adhered to the lower surface of the supporting layer 31 may have a similar shape and size to the boss 311 directly processed on the supporting layer 31, and may have a similar distribution rule, and specific parameters regarding the shape, size and distribution rule of the boss 311 may be referred to in the description elsewhere herein, and will not be repeated herein.

In some embodiments, the thickness of the boss made from the outboard material may be between 0.03mm and 1 mm. In some embodiments, the thickness of the boss made from the outboard material may be between 0.03mm and 0.5 mm. In some embodiments, the thickness of the boss made from the outboard material may be between 0.03mm and 0.4 mm. In some embodiments, the thickness of the boss made from the outboard material may be between 0.03mm and 0.3 mm. In some embodiments, the thickness of the boss made from the outboard material may be between 0.03mm and 0.1 mm.

In some embodiments, when the first adhesive layer 22 covers the lower surface of the supporting layer 31 to form the covering member 40, the boss 311 may also be adhered to the lower surface of the overlapping portion 42 of the covering member 40. In some embodiments, the total thickness of the boss 311 and the overlap portion 42 is between 0.03mm-1 mm.

In some embodiments, the flexible display panel 100 of the embodiments of the present application may be applied to the display device 1000. In order to further prevent the problem of splitting or misalignment of the film layers when used in the display device 1000 in the flexible display panel 100, the display device 1000 may include a limiting groove 300 for limiting movement of the film layers in the flexible display panel 100 in a direction perpendicular to the display surface, and preventing the film layers in the flexible display panel 100 from being mutually dispersed in the direction perpendicular to the display surface to cause splitting.

In some embodiments, referring to fig. 15, the display apparatus 1000 may include a flexible display panel 100, a rotation shaft 200, and a limiting groove 300. In some embodiments, the flexible display panel 100 may include a non-bent portion 110 always presented on a display screen of the display device 1000 and a bent portion 120 which may be bent by the rotation shaft 200 to be received in an inner space of the display device 1000. In some embodiments, the curved portion 120 of the flexible display panel 100 may be pulled out of the exit end 400 of the receiving area (e.g., the back surface of the non-curved portion 110) through the rotation axis 200 in a first direction, optionally presented as an extended display area on the display screen of the display device 1000. In some embodiments, the display device 1000 may include two limit slots disposed opposite each other. In some embodiments, the limiting grooves 300 may be disposed at both ends of the flexible display panel 100 in the second direction for limiting the movement of the flexible display panel 100 in the direction perpendicular to the display surface. In some embodiments, the limiting groove 300 is disposed near the outlet end 400 along the first direction, so that the film layer of the bending portion 120 can enter the limiting groove 300 for limiting after being pulled out along the rotating shaft 200. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm and 4.5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm and 4 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm and 3.5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm and 3 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm and 2.5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm-2 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1mm and 1.5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 1.5mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 2mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 2.5mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 3mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 3.5mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 4mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 4.5mm and 5 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 2mm and 3 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 3mm and 4 mm. In some embodiments, the spacing groove 300 may be spaced from the outlet end 400 in the first direction a distance between 2mm-4 mm.

In some embodiments, the display apparatus 1000 may include a first rotating shaft and a second rotating shaft (not shown) that are relatively distributed, and two sets of limiting grooves respectively disposed near the outlet end of the first rotating shaft and the outlet end of the second rotating shaft. In some embodiments, the flexible display panel 100 may include a non-bent portion, and first and second bent portions distributed at both sides of the non-bent portion in the first direction. In some embodiments, the first and second bending portions may be respectively bent around the first and second rotation axes to be received in the internal space of the display apparatus 1000, and pulled out from the receiving area through the first and second rotation axes when the extended display is required. In some embodiments, two sets of limiting grooves disposed near the outlet end of the first rotating shaft and the outlet end of the second rotating shaft can limit the first bending portion and the second bending portion respectively, so as to prevent the first bending portion and the second bending portion from being scattered in the pulling process.

In some embodiments, referring to fig. 16, the curved portion 120 includes a limit edge 122 that is limited from moving in a direction perpendicular to the display surface by the limit slot 300, the limit edge 122 being movable in a first direction in an internal gap 301 of the limit slot 300. In some embodiments, the stop edge 122 is at least a portion of a non-display area of the curved portion 120 along the second direction. In some embodiments, the height of the interior gap 301 of the spacing groove 300 (i.e., the spacing between the upper and lower surfaces of the interior gap 301) is the same or nearly the same as the thickness of the spacing edge 122 (a difference within ±0.05 mm). In some embodiments, to enhance the spacing effect of the spacing groove 300 on the spacing edge 122, the thickness of the spacing edge 122 may be equal to or slightly greater (within 0.05mm of the difference) than the height of the internal gap 301. In some embodiments, when the film layers of the bending portion 120 have a tendency to scatter from each other along a direction perpendicular to the display surface, the limiting groove 300 will generate a force on the bending portion 120 opposite to the scattering tendency thereof, so as to counteract the scattering tendency of the film layers, since the limiting groove 300 limits the movement of the limiting edge 122 in the direction. In some embodiments, to reduce the resistance (e.g., friction) of the movement of the limit edge 122 in the limit slot 300, the thickness of the limit edge 122 may be equal to or slightly less (within 0.05mm of the difference) than the height of the internal gap 301.

In some embodiments, when the thickness of the limit edge 122 is less than or equal to the height of the internal gap 301, the bending portion 120 is not subjected to the pressing force of the limit groove 300, and the bending portion 120 is not subjected to the friction force of the limit groove 300 when sliding. In some embodiments, when the thickness of the limit edge 122 is greater than the height of the internal gap 301, the bending portion 120 receives the pressing force of the limit groove 300, and the bending portion 120 receives the friction force of the limit groove 300 when sliding.

In some embodiments, referring to fig. 17, in order to reduce the resistance to the movement of the limit edge 122 in the limit groove 300 as much as possible while improving the limit effect of the limit groove 300 on the limit edge 122, the bending portion 120 may include a plurality of protrusions 121 provided on the limit edge 122. In some embodiments, the top of the protrusion 121 may contact the inner wall of the limit groove 300, so as to improve the limit effect of the limit groove 300 on the limit edge 122. In some embodiments, when the limit edge 122 moves in the internal gap 301 of the limit groove 300, the protrusion 121 has a smaller contact area than when the limit edge 122 contacts the inner wall of the limit groove 300, so that the friction force between the bending portion 120 and the limit groove 300 can be effectively reduced. In some embodiments, the protrusion 121 may be disposed on one of the upper or lower surfaces of the limit edge 122. In some embodiments, the protrusions 121 may be provided on both the upper and lower surfaces of the limit edge 122.

In some embodiments, the shape of the protrusions 121 may include, but is not limited to, hemispherical, meshed, great wall, wavy, etc. In some embodiments, the protrusions 121 may be disposed on both the upper and lower surfaces of the limit edge 122.

In some embodiments, the plurality of protrusions 121 may be spaced apart along the first direction on the limit edge 122. In some embodiments, the spacing of the protrusions 121 on the limit edge 122 in the first direction may be between 0.5mm and 3 mm. In some embodiments, the spacing of the protrusions 121 on the limit edge 122 in the first direction may be between 0.8mm-2 mm. In some embodiments, the spacing of the protrusions 121 on the limit edge 122 in the first direction may be between 1mm and 2 mm. In some embodiments, the plurality of protrusions 121 may be spaced apart along the second direction on the limit edge 122.

In some embodiments, the spacing of the protrusions 121 on the limit edge 122 in the second direction may be between 1mm and 4 mm. In some embodiments, the spacing of the protrusions 121 on the limit edge 122 in the second direction may be between 1mm and 3 mm. In some embodiments, the spacing of the protrusions 121 on the limit edge 122 in the second direction may be between 2mm and 3 mm. In some embodiments, only one protrusion 121 may be disposed on the limiting edge 122 along the second direction.

In some embodiments, the material of the protrusions 121 may be a rigid material. In some embodiments, the material of the protrusions 121 may include, but is not limited to, steel, alloys, glass, and the like.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations of the present application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this application, and are therefore within the spirit and scope of the exemplary embodiments of this application.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present application may be combined as suitable.

Likewise, it should be noted that in order to simplify the presentation disclosed herein and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are presented in the claims are required for the subject application. Indeed, less than all of the features of a single embodiment disclosed above.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations that may be employed in some embodiments to confirm the breadth of the range, in particular embodiments, the setting of such numerical values is as precise as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety. Except for application history documents that are inconsistent or conflicting with the present application, documents that are currently or later attached to this application for which the broadest scope of the claims to the present application is limited. It is noted that the descriptions, definitions, and/or terms used in the subject matter of this application are subject to such descriptions, definitions, and/or terms if they are inconsistent or conflicting with such descriptions, definitions, and/or terms.

Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present application. Other variations are also possible within the scope of this application. Thus, by way of example, and not limitation, alternative configurations of embodiments of the present application may be considered in keeping with the teachings of the present application. Accordingly, embodiments of the present application are not limited to only the embodiments explicitly described and depicted herein.

Claims

1. A flexible display panel, comprising:

a display layer, a first group of layers located above the display layer, and a second group of layers located below the display layer; at least a portion of the flexible display panel may be bent around a predetermined axis by an angle greater than 120 °;

the first layer group comprises a cover plate layer and a first adhesive film layer, the first adhesive film layer is provided with an extension part with a length exceeding the length of the corresponding display layer along the direction parallel to the preset axis, and the extension part is partially extended to the lower surface of the second layer group to form a cladding piece;

the second layer group comprises at least one support layer comprising a rigid material;

the cladding member cladding at least one of: the edge of the display layer, the edge of the first group of layers and the edge of the second group of layers.

2. The flexible display panel according to claim 1, wherein a length of a portion of the first adhesive film layer extending to the lower surface of the second layer group in a direction parallel to the predetermined axis is between 1mm and 5 mm.

3. The flexible display panel of claim 1, wherein a thickness of a portion of the first adhesive layer extending to the lower surface of the second layer is between 0.025mm and 0.5 mm.

4. The flexible display panel of claim 1, wherein the material of the first adhesive layer comprises optically clear adhesive.

5. The flexible display panel of claim 1, wherein the second layer group comprises a support layer and a second adhesive layer.

6. The flexible display panel of claim 5, wherein the second adhesive layer encapsulates the display layer and at least a portion of the first layer group forms the encapsulation.

7. The flexible display panel of claim 6, wherein the second adhesive layer has an extension portion having a length exceeding a length of the corresponding display layer in a direction parallel to the predetermined axis, the extension portion partially extending to an upper surface of the first layer group to form the covering member.

8. The flexible display panel according to claim 7, wherein a length of a portion of the second adhesive film layer extending to the upper surface of the first layer group in a direction parallel to the predetermined axis is between 0.7mm and 3 mm.

9. The flexible display panel of claim 7, wherein a thickness of a portion of the second adhesive layer extending to the upper surface of the first layer is between 0.025mm and 0.5 mm.

10. The flexible display panel of claim 5, wherein the material of the second adhesive layer comprises a pressure sensitive adhesive or an optically transparent adhesive.

11. The flexible display panel of claim 1, wherein the first layer group comprises a cover sheet layer and a first adhesive layer, the second layer group comprises a support layer and a second adhesive layer, and the first adhesive layer and the second adhesive layer are joined to each other to form the covering member.

12. The flexible display panel of claim 11, wherein the flexible display panel comprises,

the first adhesive film layer is provided with a first extension part with a length exceeding the length of the corresponding display layer along the direction parallel to the preset axis;

the second adhesive film layer is provided with a second extension part with a length exceeding the length of the corresponding display layer along the direction parallel to the preset axis;

The first extension and the second extension are engaged with each other to form the covering member.

13. The flexible display panel of claim 12, wherein the first and second adhesive layers are the same material.

14. The flexible display panel of claim 1, wherein the second layer group comprises a buffer film layer.

15. The flexible display panel of claim 14, wherein the buffer film layer encapsulates the display layer and at least a portion of the first layer group forms the encapsulation.

16. The flexible display panel of claim 15, wherein the buffer film layer has an extension portion having a length exceeding a length of the corresponding display layer in a direction parallel to the predetermined axis, the extension portion extending to an upper surface of the first layer group to form the sheathing member.

17. A flexible display panel according to claim 16, wherein the portion of the buffer film layer extending to the upper surface of the first layer group has a length of between 0.7mm and 3mm in a direction parallel to the predetermined axis.

18. The flexible display panel of claim 16, wherein a thickness of a portion of the buffer film layer extending to the upper surface of the first layer group is between 0.025mm and 0.5 mm.

19. The flexible display panel of claim 14, wherein the material of the buffer film layer comprises foam, gel, or silicone.

20. The flexible display panel of claim 1, wherein the exterior surface of the envelope portion of the envelope is non-tacky.

21. The flexible display panel of claim 1, wherein at least a portion of the lower surface of the second layer group comprises a plurality of bosses disposed in a distributed manner.

22. A flexible display panel according to claim 21, wherein the bosses are distributed at intervals of 0.1mm to 2mm in a direction perpendicular to the predetermined axis.

23. The flexible display panel of claim 21, wherein the boss has a shape including a hemispherical shape, a tooth shape, and an elongated shape.

24. A flexible display panel according to claim 21, wherein the boss is machined into the support layer.

25. A flexible display panel according to claim 21, wherein the boss is bonded to a lower surface of the support layer.

26. The flexible display panel of claim 21, wherein the boss material comprises steel sheet, alloy, or glass.

27. A display device comprising a flexible display panel, said flexible display panel comprising:

28. The display device according to claim 27, wherein the display device further comprises:

a rotation shaft about which at least a portion of the flexible display panel is bendable;

at least one group of limiting grooves are arranged at two ends of the flexible display panel along the direction parallel to the preset axis;

The limiting groove limits the movement of the flexible display panel along the direction perpendicular to the display surface.

29. The display device of claim 28, wherein at least a portion of the non-display area of the flexible display panel in a direction parallel to the predetermined axis slides in the first direction in the limit slot.

30. The display device according to claim 29, wherein a plurality of protrusions are distributed on an upper surface and/or a lower surface of an area of the flexible display panel located inside the limiting groove, and the protrusions can reduce a contact area between the flexible display panel and the limiting groove.

31. The display device of claim 30, wherein the shape of the protrusion comprises a hemispherical shape, a tooth shape, or a great wall shape.