CN115066717A

CN115066717A - Flexible display panel and display device

Info

Publication number: CN115066717A
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: 2022-09-16
Anticipated expiration: 2040-12-28
Also published as: WO2022141003A1; CN115066717B

Abstract

A flexible display panel (100) and a display device comprising: a display layer (10), a first layer group (20) located above the display layer (10), and a second layer group (30) located below the display layer (10); at least part of the flexible display panel (100) is bendable around a predetermined axis over an angle of more than 120 °; the first group of layers (20) comprises at least one layer; the second group of layers (30) comprises at least one supporting layer (31), the supporting 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 many times gradually enters the market and is increasingly receiving attention in the industry.

After the flexible display panel of the flexible display device is bent by a user for multiple times, bending stress is easily accumulated among all film layers in the flexible display panel, so that the film layers of the flexible display panel are dislocated or split.

Therefore, it is desirable to provide a flexible display panel with more stable interlayer bonding and less accumulation of bending stress, so as to reduce the occurrence of film misalignment or film splitting.

Disclosure of Invention

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

In some embodiments, the flexible display panel further comprises: a covering, the covering at least one of: an edge of the display layer, an edge of the first layer group, and an edge of the second layer group.

In some embodiments, the first set of layers includes a cover sheet layer and a first adhesive film layer.

In some embodiments, the first adhesive film layer covers at least a portion of the display layer and the second layer set to form the covering.

In some embodiments, the first adhesive 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 to a lower surface of the second layer group to form the covering member.

In some embodiments, 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.

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

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

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

In some embodiments, the second adhesive film layer covers at least a portion of the display layer and the first layer set to form the covering.

In some embodiments, the second adhesive 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 covering member.

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

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

In some embodiments, the first set of layers includes a cover sheet layer and a first adhesive film layer, and the second set of layers includes a support layer and a second adhesive film layer, the first and second adhesive film layers being joined to one another to form the covering.

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

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

In some embodiments, the second layer set 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 set to form the encapsulation.

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

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

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

In some embodiments, the outer surface of the enclosing portion of the cover is non-tacky.

In some embodiments, at least a portion of the lower surface of the second packet includes a plurality of bosses disposed in a distributed arrangement.

In some embodiments, the bosses are spaced apart by 0.1mm to 2mm in a direction perpendicular to the predetermined axis.

In some embodiments, the shape of the boss includes hemispherical, rodent, and elongated.

In some embodiments, the bosses are machined into the support layer.

In some embodiments, the bosses are bonded to a lower surface of the backing 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 includes: a display layer, a first layer group located above the display layer, and a second layer group located below the display layer; at least a portion of the flexible display panel may be curved about a predetermined axis at an angle greater than 120 °; the first layer set comprises at least one film layer; the second layer set includes at least one support layer comprising a rigid material.

In some embodiments, the display device further comprises: a hinge around which at least a portion of the flexible display panel is bendable; the 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 flexible display panel to move along the direction perpendicular to the display surface.

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

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

Drawings

The present application will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not intended to be limiting, and in these embodiments like numerals are used to indicate like structures, wherein:

FIG. 1 is one of partial schematic structural views of a display device according to some embodiments of the present application;

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

FIG. 3 is a second schematic diagram 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 diagram of a flexible display panel according to some embodiments of the present application;

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

FIG. 6 is one of the flow diagrams for fabricating a cover for a 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, fragmentary schematic view of region B of FIG. 7 according to the present application;

FIG. 9 is a second schematic flow chart illustrating a manufacturing process of a cover of a flexible display panel according to some embodiments of the present application;

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

FIG. 11 is a third schematic flow chart illustrating a manufacturing process of a cover of a flexible display panel according to some embodiments of the present application;

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

FIG. 13 is a fourth partial schematic structural view of a display device according to some embodiments of the present application;

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

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

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

fig. 17 is a seventh partial schematic structural view 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, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the 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 description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of 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, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items.

The flexible display panel of one or more embodiments of the present application can be applied to display devices of various electronic products. The different electronic products may include, but are not limited to, various terminal devices such as a mobile phone, a personal computer, a keyboard, a display, a television, a vehicle-mounted display terminal, an electronic book, 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-bending portion and a bending portion, and the display region is located on the non-bending portion and the bending portion. When the curved portion of the flexible display panel is bent and curved to change its shape, the area of the display region that can be viewed by the user also changes. In some embodiments, a display area of the flexible display panel exposed in the user field of view can be used as a display screen of a sliding screen mobile phone, a bending portion of the flexible display panel is bent through a rotating shaft and then is contained on the back of a main display area or is directly wound on the rotating shaft, and a user can select to contain the bending portion of the flexible display panel on the back of the display area or directly wind the bending portion on the rotating shaft according to needs 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 can also choose to pull the curved portion of the flexible display panel out of the back of 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 is located on the front side of the non-bending portion 110 and the bending portion 120, and the bending portion 120 may be received on the back side of the non-bending portion 110 after being bent around a predetermined axis 130, wherein a surface of the flexible display panel 100 for displaying may be referred to as the front side, and a surface opposite thereto may be referred to as the back side. In some embodiments, part 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 angle of the bend 120 about the predetermined axis 130 may be greater than 150 °; in some embodiments, the bend angle of the bend 120 about the predetermined axis 130 may be 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 angle of the bend 120 about the predetermined axis 130 may be much greater than 180 °, i.e., may be curled about a fixed axis. The bending angle of the bending part 120 about the predetermined axis 130 refers to an angle at which the front of the bent part of the bending part 120 is changed with respect to the front of the non-bending part 110 after a part or all of the bending part 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 an image. In some embodiments, the flexure 120 has a stiffness in the first direction that is less than its stiffness in the second direction. Referring to fig. 1, the first direction in the present application refers to a direction in which the flexible display is perpendicular or substantially perpendicular to the predetermined axis 130; the direction in which the flexible display screen is parallel or substantially parallel to the predetermined axis 130 is a second direction. Substantially perpendicular in this application means that a small amount of error, which may be within plus or minus 5 °, may be tolerated in the direction relative to perpendicular. 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 flexure 120 has a stiffness in the first direction 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 flexure 120 has a stiffness in the first direction between 0.01GPa and 1 GPa. In some embodiments, the stiffness of the flexure 120 in the second direction is between 10GPa and 1000 GPa; in some embodiments, the stiffness of the flexure 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 flexure 120 has a stiffness in the second direction between 10GPa and 300 GPa.

In some embodiments, the flexible display panel 100 may be applied to the display apparatus 1000. In some embodiments, referring to fig. 1, a display apparatus 1000 may include a flexible display panel 100 and a hinge 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 field of view of the user may serve as a display screen of the display device 1000. In some embodiments, a portion or all of the bending portion 120 of the flexible display panel 100 is bent around the rotation axis 200 and then is received in a receiving area of the display device 1000, wherein the portion of the bending portion 120 located on the rotation axis 200 and located in the receiving area is invisible to a user, and the portion located outside the receiving area and the rotation axis 200 is visible to the user. In some embodiments, the display area corresponding to the portion of the non-curved portion 110 and the curved portion 120 that is visible to the user may serve 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 from the receiving region (e.g., the rear surface of the non-curved portion 110) through the hinge 200 in the first direction, presented in the user's field of view as an extended display region selectable, become a part of the display screen of the display device 1000, and enlarge the area of the display screen. In some embodiments, the bending portion 120 may also be rolled into the back surface of the non-bending portion 110 via the rotation shaft 200 to be accommodated, and the area of the display screen may be reduced. In some embodiments, when the bending portion 120 is bent to be accommodated in the back 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 in a breath-screen 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 changed to a bright screen state and display contents, thereby increasing an area of the display area that a user can see.

In some embodiments, the display device 1000 may include a first hinge and a second hinge that are oppositely disposed. In some embodiments, the flexible display panel 100 may include a non-bent portion and a first bent portion and a second bent portion distributed on both sides of the non-bent portion along a first direction. In some embodiments, the first bending portion and the second bending portion may be respectively bent around the first rotating shaft and the second rotating shaft to be received in the inner space of the display device 1000, and respectively pulled out from the receiving areas thereof via the first rotating shaft and the second rotating shaft 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 layer group 20 and a second layer group 30, wherein the first layer group 20 is located above the display layer 10 and the second layer group 30 is located below the display layer. The upper and lower directions referred to herein indicate directions of the front and back of the display surface of the non-bending portion 110 with respect to the flexible display panel 100, the front of the display surface of the flexible display panel 100 is in the upper direction, and the back of the display surface of the flexible display panel 100 is in the lower direction.

In some embodiments, the display layer 10 is used to display an image. In some embodiments, the types of display devices in the display layer 10 used for image display may include, but are not limited to: organic Light Emitting Diodes (OLEDs), Light Emitting Diodes (LEDs), Micro Light Emitting diodes (Micro LEDs), submillimeter Light Emitting diodes (Mini LEDs), and the like.

In some embodiments, the display layer 10 may be a multilayer structure. In some embodiments, the display layer 10 may include a display device layer, an array structure layer, a flexible substrate. The flexible substrate, the array structure layer and the display device layer are sequentially arranged from bottom to top in sequence of each layer, namely the display device layer can be located on the uppermost layer of the display layer 10, the array structure layer can be located between the display device layer and the flexible substrate, and the flexible substrate can be located on the bottommost layer of the display layer 10. In some embodiments, the display device layer may include a film layer that emits light. In some embodiments, the display device layer may include an Organic Light Emitting Diode (OLED) Light Emitting layer including a plurality of pixel units arranged in an array, the pixel units Emitting 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 a pixel driving circuit electrically linked with the display device layer 3 for controlling a display image of the display device layer. In some embodiments, the pixel driving circuit may include, but is not limited to, a tft (thin Film transistor) device, a capacitor device, and the like. In some embodiments, the flexible substrate may be a base 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, a Polyimide (PI) material, a Polyethylene terephthalate (PET) material, a Polybenzimidazole (PBI) material, a Polyetheretherketone (PEEK) material, a Polyvinylidene fluoride (PVDF) material, a polyether based plastic (PPS) material, and any combination thereof. In some embodiments, the mass proportion of the polyimide in the plurality of combined materials of the flexible substrate is 50-100%; in some embodiments, the polyimide is present in an amount of 60% to 90% by weight of the combined materials of the flexible substrate. In some embodiments, the weight percentage of the polyethylene terephthalate is 0-20%; in some embodiments, the polyethylene terephthalate is 0-10% by weight; in some embodiments, the polyethylene terephthalate is present in an amount of 0 to 4% by weight. In some embodiments, the polybenzimidazole is 0-30% by weight; in some embodiments, the mass proportion of the polybenzimidazole is 5-20%; in some embodiments, the polyether-ether-ketone accounts for 0-4% of the total weight of the composition. In some embodiments, the mass ratio of the polyvinylidene fluoride is 0-10%; in some embodiments, the mass percentage of the polyvinylidene fluoride is 0-5%. In some embodiments, the mass ratio of the polyether plastic is 0-10%; in some embodiments, the mass ratio of the polyether plastic is 0-5%.

In some embodiments, the first layer group 20 may include a cover plate protection layer 21 and a first adhesive film layer 22, wherein the cover plate layer 21 is adhered to the upper surface of the display layer 10 by the first adhesive film 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 plate layer 21 may be made of a material having both flexibility, high hardness, and high light transmittance. In some embodiments, the material of cover plate layer 21 may include, but is not limited to, Polyimide (PI) material, Colorless Polyimide (CPI) material, optical poly terephthalate (PET) plastic, aramid (Nomex) material, and Ultra-thin flexible glass (UTG) material. In some embodiments, the first adhesive film layer 22 may be a glue material with high light transmittance. In some embodiments, the first Adhesive film layer 22 may be an Optically Clear Adhesive (OCA).

In some embodiments, the first layer set 20 may further include an optical film layer (not shown) for assisting the display layer 10 to display an image. In some embodiments, the optical film layer may include a polarizer. In some embodiments, the polarizer may be disposed between the cover plate layer 21 and the display layer 10, and bonded to the display layer 10 through 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 to implement a function of the user performing the touch operation on the image displayed on the display layer 10. In some embodiments, the touch layer may be disposed between the cover plate layer 21 and the display layer 10, and is adhered to the display layer 10 by a glue material (e.g., OCA) having high light transmittance. In some embodiments, the touch layer may include a touch device for enabling a user to perform touch control on 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 related gestures.

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

In some embodiments, the second layer set 30 may include a support layer 31 and a second adhesive film layer 32, wherein the support layer 31 is adhered to the lower surface of the display layer 10 by the second adhesive film 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 are used. In some embodiments, rigid materials may include, but are not limited to, steel sheets, alloys, and flexible glasses. In some embodiments, the second adhesive film layer 32 may include, but is not limited to, Pressure Sensitive Adhesive (PSA), Optically Clear Adhesive (OCA), photosensitive adhesive, and thermal adhesive, among others.

In some embodiments, the second packet 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, and reduce the influence of the display layer 10 when being impacted by an external force. In some embodiments, the buffer film layer may be bonded to the display layer 10 and other film layers in the second layer group 30 by an adhesive material. For example, a buffer film layer may be attached between the lower surface of the display layer 10 and the upper surface of the support layer 31 by 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 for adhering 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 shaft 200, the bending stress generated in each film layer is different due to different bending radii of the film layers of the multi-layer structure, and the bending stress applied to the film layer close to the rotation shaft 200 is larger than the bending stress applied to the film layer far from the rotation shaft 200. Therefore, during the bending process of the flexible display panel 100 and the display layer 10 thereof, the film layer dislocation or the film layer splitting phenomenon is easy to occur.

In some embodiments, the occurrence of the film misalignment phenomenon in the display layer 10 may be prevented by increasing the bonding strength between the respective films in the display layer 10. In some embodiments, in order to improve the bonding strength between the film layers in the display layer 10 and reduce the possibility of film layer misalignment, the flexible display panel 100 may include a wrapping member 40 for wrapping and reinforcing the display layer 10, and 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 misalignment and movement thereof.

In some embodiments, referring to fig. 3, the flexible display panel 100 may further include a wrapping member 40 for wrapping at least a portion of one of at least 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 covering member 40 may cover a portion of the display layer 10 corresponding to the bent portion 120. In some embodiments, the covering member 40 may entirely cover the display layer 10. In some embodiments, the wrap 40 may wrap the edges of the display layer 10. In some embodiments, the edge of the display layer 10 may correspond to a non-display region of the flexible display panel 100. The non-display area refers to an area of the flexible display panel 100 that does not have an image display function.

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

In some embodiments, the cover 40 may cover at least a portion of both the display layer 10 and the second layer set 30. In some embodiments, the wrap 40 may wrap around the edges of the first layer set 30. In some embodiments, the cover 40 may cover the display layer 10 and the second layer set 30 integrally. In some embodiments, the cover 40 may cover only the portions of the display layer 10 and the second layer set 30 corresponding to the bend 120. In some embodiments, the cover 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 area of the flexible display panel 100.

In some embodiments, the cover 40 may be formed from an interior film layer of the flexible display panel 100. In some embodiments, the covering 40 may be formed from the first adhesive film layer 22. In some embodiments, the covering 40 may be formed from the second adhesive film layer 32. In some embodiments, the overmold 40 may be formed from a buffer film layer.

In some embodiments, referring to fig. 4, the cover 40 may include an overlapping portion 42 and an enclosing portion 43. In some embodiments, the overlapping portion 42 may be a portion of the film forming the cover 40 that overlaps the upper surface of the first layer set 20 or the lower surface of the second layer set 30. In some embodiments, the encapsulation portion 43 may be a portion of the film layer forming the covering member 40 located outside the display layer 10 in the second direction. In some embodiments, the cover 40 may not include the overlapping portion 42, and only the enclosing portion 43. In some embodiments, the covering 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 envelope portion 43 of the covering 40.

In some embodiments, the inner surface of overlap 42 is tacky and the outer surface is non-tacky, wherein the inner surface of overlap 42 is the surface of overlap 42 that contacts the upper surface of first layer set 20 or the lower surface of second layer set 30, and the surface opposite is the outer surface of overlap 42. In some embodiments, the outer surface of the wrapping portion 43 is not tacky, wherein the outer surface of the wrapping portion 43 refers to the surface of the wrapping portion 43 facing away from the display layer 10, and the surface of the wrapping 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, a tack-free surface of the overmold 40 may be achieved via a curing process. In some embodiments, the covering member 40 is formed by an adhesive film layer (e.g., the first adhesive film layer 22 or the second adhesive film layer 32), and after the adhesive film layer is formed into the covering member 40, the adhesive material of the outer surface portions of the overlapping part 42 and the enclosing part 43 may be subjected to a surface curing treatment to obtain a non-adhesive surface. In some embodiments, a tack-free surface of the overmold 40 may be achieved by not coating the adhesive. In some embodiments, the covering 40 is formed of a non-adhesive film layer (e.g., a buffer film layer), and portions of the non-adhesive film layer corresponding to the outer surfaces of the overlapping portion 42 and the enclosing portion 43 may not be coated with an adhesive material. In some embodiments, after the adhesive film layer forms the covering member 40, the overlapping portion 42 and the enclosing portion 43 may be integrally cured to increase the strength of the overlapping portion 42 and the enclosing portion 43, thereby improving the covering effect of the covering member 40. In some embodiments, the adhesive film layer may not be cured after forming the covering 40, so as to maintain higher flexibility of the covering 40 and improve the buffering performance thereof.

In some embodiments, the first layer set 20 may include a cover sheet layer 21 and a first adhesive film layer 22, and the second layer set 30 may include a support layer 31 and a 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 set 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 set 20 may also include a touch layer (not shown). In some embodiments, the touch layer may be disposed between the first adhesive film layer 22 and the display layer 10. In some embodiments, the first layer set 20 may also include both the optical film layer and the touch layer. In some embodiments, the optical film layer may be disposed between the first adhesive film layer 22 and the touch layer, and the touch layer 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 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 of the first adhesive film layer 22. In some embodiments, the first adhesive film layer 22 may wrap at least a portion of the display layer 10 and the second layer set 30 to form a wrap 40. In some embodiments, the first adhesive film layer 22 may encapsulate at least portions of the optical film layer, the display layer 10, and the second layer group 30 to form an encapsulation 40. In some embodiments, the first adhesive film layer 22 may cover at least a portion of the touch layer, the display layer 10, and the second layer set 30 to form the covering member 40. In some embodiments, the first adhesive film layer 22 may cover at least a portion of the optical film layer, the touch layer, the display layer 10, and the second layer 30 to form the covering member 40. In some embodiments, the cover 40 may include an overlapping portion 42 and an enclosing portion 43. In some embodiments, the overlapping portion 42 is located on the lower surface of the support layer 31, and the wrapping portion 43 is located on the outer side of the display layer 10 along the predetermined axis 130. In some embodiments, the covering member 40 may cover any side of the flexible display panel 100 along the second direction. In some embodiments, the covering member 40 may also cover both sides of the flexible display panel 100 along the second direction.

In some embodiments, referring to fig. 4A and 4B, the first adhesive film layer 22 has an extension 221 having a length exceeding the length of the corresponding display layer 10 in the second direction (the direction parallel to the predetermined axis 130), and the extension 221 partially extends to the lower surface of the second layer group 30, so that the first adhesive film layer 22 partially extends, 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 30 may form the overlap portion 42 of the overmold 40. In some embodiments, the portion of the extension portion 221 that does not extend to the lower surface of the second layer set 30 forms the encapsulation portion 43 of the covering member 40 for encapsulating the film between the first adhesive film layer 22 and the overlapping portion 42. The film between the first adhesive film layer 22 and the overlapping portion 42 included in the envelope portion 43 is referred to as an envelope film layer. In some embodiments, the film layers encapsulated by the encapsulation portion 43 (i.e., the encapsulated film layers) may include the display layer 10, the second adhesive film layer 32, and the support layer 31. In some embodiments, the encapsulated film layers 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 layers 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 layers may include an optical film layer, a touch 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 a 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 allow a small amount of dislocation between the film layers to release a portion 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 film layers from being separated, so that only a small amount of dislocation between the film layers may be present, and the film layers may not be separated, and the wrapping member 40 configured in this way may achieve both the effects of stress release and connection reinforcement 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 encapsulated film layer, i.e. there is no gap between the wrapping portion 43 and the encapsulated film layer. In some embodiments, the wrapping portion 43 is attached to the outer side of the wrapped film layer to improve the packaging strength of the wrapped film layer.

The length L of overlap portion 42 in the second direction ₁ Depending on the material properties of the overmold 40 and the strength of the bond. Generally, the overlap 42 is too long, which results in wasted material and may affect the display performance due to the extra thickness of the overlap. If the overlap 42 is too short, the adhesive strength may be insufficient and the significance of the overlap may be lost. In order to avoid the influence of the overlapping portion 42 on the display performance, the overlapping portion 42 should overlap the non-display area of the flexible display panel 100 as much as possible, i.e., the overlapping portion 42 should avoid extending below (or above) the display area as much as possible. In some embodiments, overlap portion 42 has a length L in the second direction ₁ I.e., corresponding to the width of the second group of packets 30 that is covered by the covering 40 in the margin thereof. Referring to fig. 5, in some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 1mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 1mm and 4 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 1mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 1mm and 2 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 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 overmold 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 overmold 40 in the second direction ₁ Between 1.5mm and 3 mm. In some embodiments, overlapping portion 42 of overmold 40 is along the secondLength L of direction ₁ Between 1.5mm and 2 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 2mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 3mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 4mm and 5 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 2mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 2mm and 4 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₁ Between 3mm and 4 mm.

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

In some embodiments, the material of the first adhesive film layer 22 may be an adhesive material with high light transmittance. In some embodiments, the material of the first adhesive film layer 22 may include Optically Clear Adhesive (OCA). In some embodiments, the material of the first adhesive film layer 22 may also include an accelerator or catalyst to assist in the adhesion of the adhesive material. In some embodiments, the first adhesive film layer 22 may use OCA as the main adhesive material, and an appropriate amount of accelerator is added. In some embodiments, the ratio of the primary cement to the accelerator may be between 95:5 to 99.999: 0.001.

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

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

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

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

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

In step 620, the display layer 10 is stacked on the upper surface of the second adhesive film layer 32.

In some embodiments, the bonding surfaces of the display layer 10 and the second adhesive film layer 32 have as the same shape and area as possible. In some embodiments, the second adhesive film layer 32 may be slightly smaller than the display layer 10. In some embodiments, the distance between each edge of the second adhesive film 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 stiffness of the display layer 10 may be less along its long sides than along its short sides, such that at least part of the display layer 10 is able to bend along its long sides. In some embodiments, the stiffness of the display layer 10 along its long sides may also be greater than along its short sides, such that at least a portion of the display layer 10 is able to bend along its short sides.

Step 630, a first adhesive film layer 22 is stacked on the display layer 10, wherein the first adhesive film layer 22 has an extending portion 221 relative to the display layer 10.

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

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

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

In step 640, a cover sheet layer 21 is laid on the first adhesive film layer 22.

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

In step 650, the extension 221 is flipped down and bonded to the lower surface of the support layer 31.

In some embodiments, after the extension portion 221 is flipped down and adhered to the lower surface of the support layer 31, the extension portion 221 forms the overlapping portion 42 and the envelope portion 43. In some embodiments, the operator may further cure the outer surfaces of the overlapping portion 42 and the enclosing portion 43 to make the outer surfaces of the overlapping portion 42 and the enclosing portion 43 non-tacky.

In some embodiments, the first layer set 20 may include a cover sheet layer 21 and a first adhesive film layer 22, and the second layer set 30 may include a support layer 31 and a 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 from the second adhesive film layer 32. In some embodiments, the second adhesive film layer 32 may wrap at least a portion of the display layer 10 and the first layer set 20 to form a wrap 40. In some embodiments, the cover 40 may include an overlapping portion 42 and an enclosing portion 43. In some embodiments, the overlapping portion 42 is located on the upper surface of the cover layer 21, and the enclosing portion 43 is located outside the display layer 10 in the second direction. In some embodiments, the covering member 40 may cover any side of the flexible display panel 100 along the second direction. In some embodiments, the covering member 40 may also cover both sides of the flexible display panel 100 along the second direction.

In some embodiments, referring to fig. 7, the second adhesive film layer 32 has an extension 321 with a length exceeding the length of the corresponding display layer 10 in a direction parallel to the predetermined axis 130, and the extension 321 partially extends to the upper surface of the first layer group 20, so that the second adhesive film layer 32 partially extends, 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 deck group 20 may form the overlapping portion 42 of the overmold 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 the enclosing portion 43 of the covering member 40 for enclosing the film between the second adhesive film layer 32 and the overlapping portion 42. In some embodiments, the film layers enclosed by the enclosing portion 43 may include the display layer 10 and all the film layers in the first layer set 20.

The length L of overlap portion 42 in the second direction ₂ Depending on the material properties of the overmold 40 and the strength of the bond. In some embodiments of the present invention, the,the length L of overlap portion 42 in the second direction ₂ I.e. corresponding to the width of the edge of the first layer set 20 which is covered by the covering 40. Referring to FIG. 8, in some embodiments, the length L of overlapping portion 42 of overmold 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 overmold 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 overmold 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 overmold 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 overmold 40 in the second direction ₂ Between 1mm and 3 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₂ Between 1mm and 2.5 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 40 in the second direction ₂ Between 1mm and 2 mm. In some embodiments, the length L of the overlapping portion 42 of the overmold 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 overmold 40 in the second direction ₂ Between 1.5mm and 2.5 mm. In some embodiments, the length L of the overlapping flap portion 42 of the covering 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 overmold 40 ₂ Between 0.025mm and 0.5 mm. In some embodiments, the thickness h of the overlapping portion 42 of the overmold 40 ₂ Thickness h of overlap 42 in some other embodiments of the present application ₁ Of the overlapping portion 42, a thickness h ₂ The specific value range of (a) may refer to the description in fig. 5 of the present application, which is not described herein again.

In some embodiments, the material of the second adhesive film 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 film layer 32 may also include an accelerator or catalyst to assist in the adhesion of the adhesive material.

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

at step 910, a second adhesive film layer 32 is laminated on the upper surface of the support layer 31.

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

Step 920, the display layer 10 is stacked on the upper surface of the second adhesive film layer 32, and the second adhesive film layer 32 has an extending portion 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 stiffness of the display layer 10 along its long sides may be less than the stiffness along its short sides, such that at least part of the display layer 10 is able to bend along its long sides. In some embodiments, the stiffness of the display layer 10 along its long sides may also be greater than along its short sides, such that at least a portion of the display layer 10 is able to bend along its short sides.

In some embodiments, the second adhesive film 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 in the direction of the long side thereof, and the second adhesive film layer 32 has a greater width than the display layer 10 in the direction of the short side of the display layer 10. In some embodiments, after the second adhesive film layer 32 is bonded to the display layer 10, the extension portions 321 with the same size are provided at two ends of the display layer 10 in the direction of the short side. In some embodiments, the extension 321 may be only present at one end of the display layer 10 in the direction of the short side. In some embodiments, the display layer 10 may be bent in the direction of the short side thereof, and the second adhesive film layer 32 has a greater width than the display layer 10 in the direction of the long side of the display layer 10. In some embodiments, the extension 321 may be located at two ends or one end of the display layer 10 in the direction of the long side.

At step 930, a first adhesive film layer 22 is laminated on the display layer 10.

In some embodiments, the first adhesive film layer 22 may be a film-like adhesive material. In some embodiments, the first adhesive film layer 22 may be an Optically Clear Adhesive (OCA) in a film form, and the thickness dimension parameters of the optically clear adhesive may be as described elsewhere in this application and will not be described herein.

In some embodiments, the first adhesive film layer 22 and the display layer 10 are as identical in shape and area as possible. In some embodiments, the first adhesive film layer 22 may be slightly smaller than the display layer 10. In some embodiments, the distance between each edge of the first adhesive film 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 on the display layer 10 before the first adhesive film layer 22 is laid on the display layer 10.

At step 940, the cover sheet 21 is laid 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 cover sheet layer 21 may include a CPI film layer.

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

In some embodiments, after the extension 321 is flipped up and adhered to the upper surface of the cover sheet layer 21, the extension 321 forms the overlapping portion 42 and the enclosing portion 43. In some embodiments, the operator may further cure the outer surfaces of the overlapping portion 42 and the enclosing portion 43 to make the outer surfaces of the overlapping portion 42 and the enclosing portion 43 non-tacky.

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

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

In some embodiments, the material of the first adhesive film layer 22 and the second adhesive film layer 32 may be the same. In some embodiments, the first adhesive film layer 22 and the second adhesive film layer 32 may comprise optically clear adhesive. In some embodiments, the first adhesive film layer 22 and the second adhesive film layer 32 may be two distinct portions on one complete adhesive film layer (e.g., an 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 layers planes may form the first adhesive film layer 22 and the second adhesive film layer 32, respectively, laid up between the other film layers of the flexible display panel 100. In some embodiments, the bonding portion of the complete adhesive film layer outside the display layer 10 after being folded back may form the envelope portion 43 of the covering member 40.

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

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

In some embodiments, the support layer 31 may be a sheet-like rigid material. In some embodiments, support layer 31 may be a sheet of steel or other rigid material of similar properties. The relevant dimension parameters of the rigid material can be referred to the description of fig. 6 of the present application, and are not described 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 adhesiveness 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 in the long side direction of the support layer 31, have a side having the same length as 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 a side having the same length as the support layer 31 in the short side direction of the support layer 31.

Step 1120, laying the display layer 10 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, and the adhesive film layer has a portion extending beyond a short side or a long side thereof with respect to the display layer 10.

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

Step 1130, the part of the adhesive film layer extending out of the supporting layer 31 is folded 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 portion of the adhesive film layer extending beyond the support layer 31 is folded and adhered to the upper surface of the display layer 10 to form the covering member 40. The covering member 40 may cover the display layer 10 therebetween by forming the first adhesive film layer 22 and the second adhesive film layer 32 joined 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 covering member 40.

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

In some embodiments, the second layer set 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, the buffer film layer may cover at least a portion of the display layer 10 and the first layer set 20 to form the covering 40.

In some embodiments, the buffer film layer has an extension in the second direction (a direction parallel to the predetermined axis 130) having a length exceeding the length of the corresponding display layer 10, and the extension partially extends to the upper surface of the first layer set 20, so that the buffer film layer forms the wrapping member 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 covering 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 covering element 40 formed by the buffer layer has a similar structural shape and size parameters as the covering element 40 formed by the second adhesive film layer 32, which can be specifically referred to the related description of fig. 8 in this application and will not be described herein again. In some embodiments, the buffer 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, silicone material, or the like.

In some embodiments, by reducing the bending stress to which the display layer 10 is subjected when bent, the risk of film misalignment of the display layer 10 may be prevented. In some embodiments, to reduce the 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 arranged in a distribution along the first direction. When the flexible display panel 100 moves on the rotation shaft 200 in a bending manner, the boss 311 directly contacts with the rotation shaft 200, and the force applied to the flexible display panel 100 by the rotation shaft 200 directly acts on the boss 311. Because a certain gap exists between the adjacent bosses 311, the adjacent bosses 311 are not mutually squeezed when the flexible display panel 100 is bent, and the bending stress generated when the flexible display panel is bent can be effectively reduced. Moreover, the strain generated by the flexible display panel 100 during bending can be released through the gap between the bosses 311, and the strain is prevented from being further transmitted to each film layer of the display layer 10 after being accumulated in each film layer of the flexible display panel 100, so that the risk of film layer dislocation and splitting of the flexible display panel 100 and each film layer of the display layer 10 during bending 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, support layer 31 may comprise a steel sheet on which bosses 311 may be machined. In some embodiments, support layer 31 may be ultra-thin glass, and mesa 311 may be machined into the ultra-thin glass. In some embodiments, after the boss 311 is formed, a rubber material may be coated on the surface of the boss 311, so that the boss 311 can provide a certain buffering effect when being pressed by the rotating shaft. In some embodiments, the adhesive coated on the boss 311 may include, but is not limited to, polyurethane rubber (PU), silicone rubber, or Thermoplastic polyurethane elastomer rubber (TPU), and the like. In some embodiments, the bosses 311 may not be formed on the rigid material of the support layer 31, but the rubber material may be directly coated on the rigid material to form the bosses 311.

In some embodiments, the bosses 311 may be provided on the lower surface of the 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 distribution along the first direction on the back surface of the support layer 31. In some embodiments, the distribution of the mesas 311 along the first direction may be equally spaced. In some embodiments, the bosses 311 may be disposed at regular intervals along the second direction on the lower surface of the support layer 31. In some embodiments, the distribution rule of the bosses 311 in the second direction may be an equal interval distribution. In some embodiments, the distribution of the bosses 311 along the second direction may also be distributed at unequal intervals. In some embodiments, the bosses 311 may be distributed in the second direction in the areas of both ends of the support layer 31 in that direction. In some embodiments, the ratio of the area of the support layer 31 having the protrusions 311 distributed at both ends in the second direction to the total width in the second direction may be between 10% and 60%. In some embodiments, the bosses 311 may also be disposed through the lower surface of the support layer 31 in the second direction.

The distribution interval of the bosses 311 depends on the shape of the bosses. Generally, the projections 311 are spaced apart too far, which may affect the supporting effect of the supporting layer 31. The distance between the bosses 311 is too small, and when the flexible display panel 100 is bent, the adjacent bosses may be squeezed together to generate a squeezing force, so that the significance 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 and 2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm and 1.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm and 1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm and 1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm and 1 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.1mm and 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 and 0.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm and 0.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm and 1 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm and 1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.4mm and 1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.5mm and 1.5 mm. In some embodiments, the lands 311 may be spaced apart in the first direction by between 0.5mm and 1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.5mm and 1 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.5mm and 0.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.8mm and 1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 0.8mm and 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 and 1.2 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1mm and 1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1mm and 1.8 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1.2mm and 1.5 mm. In some embodiments, the distribution spacing of the bosses 311 in the first direction may be between 1.2mm and 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 a hemispherical shape, a rodent shape, and a long strip shape.

In some embodiments, referring to fig. 13, the shape of the boss 311 may be hemispherical. In some embodiments, the radius of the hemispherical boss may be between 0.03mm and 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 distribution interval of the hemispherical convex platforms along the first direction can be between 0.1mm and 1 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the first direction can be between 0.3mm and 1 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the first direction can be between 0.5mm and 1 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the first direction can be between 0.5mm and 0.9 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the first direction can be between 0.5mm and 0.8 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the first direction can be between 0.5mm and 0.7 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the first direction can be between 0.6mm and 0.8 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the first direction can be between 0.6mm and 1 mm.

In some embodiments, the distribution interval of the hemispherical convex platforms along the second direction can be between 0.5mm and 4 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the second direction can be between 1mm and 4 mm. In some embodiments, the distribution spacing of the hemispherically-shaped bosses along the second direction may be between 1.5mm and 4 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the second direction can be between 2mm and 4 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the second direction can be between 2.5mm and 4 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the second direction can be between 3mm and 4 mm. In some embodiments, the distribution interval of the hemispherical convex platforms along the second direction can be between 3.5mm and 4 mm.

In some embodiments, referring to fig. 14, the shape of the boss 311 may be a tooth shape. In some embodiments, referring to fig. x, the rodent 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 and 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 and 2 mm. In some embodiments, the short side N of the trapezoid may have a value between 0.5mm and 1 mm. In some embodiments, the short side N of the trapezoid may have a value between 0.5mm and 0.8 mm. In some embodiments, the short side N of the trapezoid may have a value between 0.8mm and 1 mm. In some embodiments, the short side N of the trapezoid may have a value between 0.6mm and 0.8 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 1 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 1 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.9 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.8 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.7 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.6 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.5 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.4 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.3 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.2 mm. In some embodiments, the height L of the trapezoid can have a value between 0.03mm and 0.1 mm. In some embodiments, the height L of the trapezoid can have a value between 0.1mm and 1 mm. In some embodiments, the height L of the trapezoid can have a value between 0.1mm and 0.7 mm. In some embodiments, the height L of the trapezoid can have a value between 0.1mm and 0.5 mm. In some embodiments, the height L of the trapezoid can have a value between 0.1mm and 0.4 mm. In some embodiments, the height L of the trapezoid can have a value between 0.1mm and 0.3 mm. In some embodiments, the height L of the trapezoid can have a value between 0.1mm and 0.2 mm. In some embodiments, the height L of the trapezoid can have a value between 0.3mm and 0.5 mm. In some embodiments, the height L of the trapezoid can have a value between 0.3mm and 0.4 mm. In some embodiments, the height L of the trapezoid can have a value between 0.4mm and 0.5 mm.

In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.5mm-1 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.5mm-0.9 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.5mm-0.8 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.5mm-0.7 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.5mm-0.6 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.6mm-1 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.7mm-1 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.8mm-1 mm. In some embodiments, the rodent bosses may be spaced apart in the first direction by between 0.9mm-1 mm.

In some embodiments, the distribution intervals of the rodent bosses along the second direction may be set similarly to the division intervals of the hemispherical bosses along the second direction, and specific interval sizes may be referred to in the description of the rest of the application, which is not described herein in detail.

In some embodiments, the shape of the bosses 311 is elongated. In some embodiments, the elongated boss may penetrate through the lower surface of the support layer 31 in the second direction. In some embodiments, the lower surface of the support layer 31 may also have a plurality of elongated bosses distributed along the second direction. In some embodiments, the elongated bosses have a rectangular cross-section in a plane perpendicular to the predetermined axis 130. In some embodiments, the rectangle has a side length along the first direction having a value between 0.5mm and 3 mm. In some embodiments, the length of a side of the rectangle in the first direction has a value between 0.5mm and 2.5 mm. In some embodiments, the rectangle has a side length along the first direction having a value between 0.5mm and 2 mm. In some embodiments, the length of a side of the rectangle in the first direction has a value between 0.5mm and 1.5 mm. In some embodiments, the length of a side of the rectangle in the first direction has a value between 0.5mm and 1 mm. In some embodiments, a side length of the rectangle in the first direction has a value between 1mm and 3 mm. In some embodiments, the length of a side of the rectangle in the first direction has a value between 1mm and 2.5 mm. In some embodiments, the length of a side of the rectangle in the first direction has a value between 1mm and 2 mm. In some embodiments, the rectangle has a side length along the first direction having a value between 1mm and 1.5 mm. In some embodiments, the rectangle has a side length along the first direction having a value between 1.5mm and 3 mm. In some embodiments, the length of a side of the rectangle in the first direction has a value between 2mm and 3 mm. In some embodiments, the rectangle has a side length along the first direction having a value between 2.5mm and 3 mm. In some embodiments, the high value of the rectangle may be between 0.03mm and 1 mm. In some embodiments, the height of the rectangle may be set similarly to the height L of the trapezoid in the rodent platform, which may be referred to the description elsewhere in this application and will not be described herein.

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

In some embodiments, the plurality of bosses 311 may be made of additional external material and adhered to the lower surface of the support layer 31. In some embodiments, the plurality of bosses 311 may be disposed on the external film layer, and a surface of the external film layer opposite to the position of the bosses 311 is bonded to the lower surface of the support layer 31, so that the bosses 311 are fixed on the lower surface of the support layer 31. In some embodiments, the material of the boss 311 may include, but is not limited to, steel sheet, alloys, glass, and any combination thereof. In some embodiments, the adhesive material that bonds the external material and the support layer 31 may include, but is not limited to, optically clear adhesive, pressure sensitive adhesive, heat sensitive adhesive, or the like. In some embodiments, the bosses 311 made of an external material and adhered to the lower surface of the support layer 31 may have a shape and a size similar to the bosses 311 directly formed on the support layer 31, and may have a distribution rule similar to the shape and the size of the bosses 311, and specific parameters related to the shape, the size, and the distribution rule of the bosses 311 may be referred to in descriptions elsewhere in this application, which are not described herein again.

In some embodiments, the boss made of an exteriorly disposed material may have a thickness of between 0.03mm and 1 mm. In some embodiments, the boss made of an exteriorly disposed material may have a thickness of between 0.03mm and 0.5 mm. In some embodiments, the boss made of an exteriorly disposed material may have a thickness of between 0.03mm and 0.4 mm. In some embodiments, the boss may be made of an outboard material having a thickness of between 0.03mm and 0.3 mm. In some embodiments, the boss made of an exteriorly disposed material may have a thickness of between 0.03mm and 0.1 mm.

In some embodiments, when the first adhesive film layer 22 covers the lower surface of the support 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 boss 311 and overlap portion 42 is between 0.03mm and 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 that the film layers are split or misplaced when the flexible display panel 100 is used in the display device 1000, 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 mutually spreading in the direction perpendicular to the display surface to cause splitting.

In some embodiments, referring to fig. 15, the display apparatus 1000 may include the flexible display panel 100, the rotation shaft 200, and the spacing groove 300. In some embodiments, the flexible display panel 100 may include a non-bent portion 110 always present on the display screen of the display device 1000 and a bent portion 120 that may be bent by the hinge 200 to be received in the 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 of the non-curved portion 110) through the hinge 200 in a first direction as an extended display area to be selectively presented on the display screen of the display device 1000. In some embodiments, the display device 1000 may include two retaining grooves disposed opposite to each other. In some embodiments, the position-limiting groove 300 may be disposed at two ends of the flexible display panel 100 along the second direction, for limiting the movement of the flexible display panel 100 along 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 distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 1mm and 5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 1mm and 4.5 mm. In some embodiments, the spacing between the retaining groove 300 and the outlet end 400 in the first direction may be between 1mm and 4 mm. In some embodiments, the spacing distance between the retaining groove 300 and the outlet end 400 in the first direction may be between 1mm and 3.5 mm. In some embodiments, the spacing between the retaining groove 300 and the outlet end 400 in the first direction may be between 1mm and 3 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 1mm and 2.5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 1mm and 2 mm. In some embodiments, the spacing distance between the retaining groove 300 and the outlet end 400 in the first direction may be between 1mm and 1.5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 1.5mm and 5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 2mm and 5 mm. In some embodiments, the spacing distance between the retaining groove 300 and the outlet end 400 in the first direction may be between 2.5mm and 5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 3mm and 5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 3.5mm and 5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 4mm and 5 mm. In some embodiments, the spacing between the retaining groove 300 and the outlet end 400 in the first direction may be between 4.5mm and 5 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 2mm and 3 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 3mm and 4 mm. In some embodiments, the spacing distance between the restraint slot 300 and the outlet end 400 in the first direction may be between 2mm and 4 mm.

In some embodiments, the display device 1000 may include a first rotating shaft and a second rotating shaft (not shown) that are oppositely disposed, 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 a first bent portion and a second bent portion distributed on both sides of the non-bent portion along a first direction. In some embodiments, the first bending portion and the second bending portion may be respectively bent around the first rotating shaft and the second rotating shaft to be received in the inner space of the display device 1000, and pulled out from the receiving area via the first rotating shaft and the second rotating shaft when the extended display is required. In some embodiments, two sets of limiting grooves arranged near the outlet end of the first rotating shaft and the outlet end of the second rotating shaft can limit the first bending part and the second bending part respectively, so that the phenomenon that the film layer is scattered in the pulling-out process of the first bending part and the second bending part is prevented.

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

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

In some embodiments, referring to fig. 17, in order to improve the limiting effect of the limiting groove 300 on the limiting edge 122 and simultaneously reduce the resistance of the limiting edge 122 moving in the limiting groove 300 as much as possible, the bending part 120 may include a plurality of protrusions 121 disposed on the limiting edge 122. In some embodiments, the top of the protrusion 121 may contact the inner wall of the position-limiting groove 300, so as to improve the position-limiting effect of the position-limiting groove 300 on the position-limiting edge 122. In some embodiments, when the limiting edge 122 moves in the inner gap 301 of the limiting groove 300, the protrusion 121 has a smaller contact area than when the limiting edge 122 contacts with the inner wall of the limiting groove 300, and the friction between the bending part 120 and the limiting groove 300 can be effectively reduced. In some embodiments, the protrusion 121 may be disposed on one of the upper surface and the lower surface of the limiting edge 122. In some embodiments, the protrusions 121 may be disposed on both the upper and lower surfaces of the position-defining rim 122.

In some embodiments, the shape of the protrusions 121 may include, but is not limited to, hemispherical, scalloped, great wall, or wavy, among others. In some embodiments, the protrusion 121 may be disposed on both upper and lower surfaces of the position-limiting edge 122.

In some embodiments, the plurality of protrusions 121 may be spaced apart along the first direction on the limiting edge 122. In some embodiments, the spacing of the protrusions 121 on the stop 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 stop edge 122 in the first direction may be between 0.8mm and 2 mm. In some embodiments, the spacing of the protrusions 121 on the stop 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 limiting edge 122. In some embodiments, the spacing of the protrusions 121 on the stop edge 122 in the second direction may be between 1mm-4 mm. In some embodiments, the spacing of the protrusions 121 on the stop edge 122 in the second direction may be between 1mm-3 mm. In some embodiments, the spacing of the protrusions 121 on the stop edge 122 in the second direction may be between 2mm-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 protrusion 121 may be a hard material. In some embodiments, the material of the protrusion 121 may include, but is not limited to, steel, alloy, glass, and the like.

Benefits that may be realized by one or more of the embodiments disclosed herein include, but are not limited to: (1) the coating piece provided by one or more embodiments of the application can coat and reinforce the display layer and the flexible display panel, so that the binding force between the display layer and each film layer of the flexible display panel is effectively improved; (2) the wrapping piece provided by one or more embodiments of the application is formed by the internal film layer of the flexible display panel, and can be directly wrapped on the display layer, so that the reinforcing effect on the internal film layer of the display layer is improved; (3) the supporting layer provided by one or more embodiments of the application comprises a plurality of bosses which are distributed, so that the bending stress generated by the flexible display panel in the bending process can be effectively reduced, and the membrane layer dislocation caused by overlarge bending stress among the membrane layers of the flexible display panel can be effectively prevented; (4) the limiting groove that one or more embodiments of this application provided can effectively restrict the motion of flexible display panel along its display surface direction, can effectively prevent each rete splitting of flexible display panel and scatter.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be considered merely illustrative and not restrictive of the broad application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, though not expressly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit-preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the range.

The entire contents of each patent, patent application publication, and other material cited in this application, such as articles, books, specifications, publications, documents, and the like, are hereby incorporated by reference into this application. Except where the application is filed in a manner inconsistent or contrary to the present disclosure, and except where the claim is filed in its broadest scope (whether present or later appended to the application) as well. It is to be understood that the descriptions, definitions and/or uses of terms in the attached materials of this application shall control if they are inconsistent or inconsistent with the statements and/or uses of this application.

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

Claims

A flexible display panel, comprising:

a display layer, a first layer group located above the display layer, and a second layer group located below the display layer; at least part of the flexible display device may be bent around a predetermined axis, the angle of bending being greater than 120 °;

the first layer set comprises at least one film layer;

the second set of layers includes at least one support layer comprising a rigid material.
The flexible display panel of claim 1, further comprising:

a covering, the covering at least one of: a border of the display layer, a border of the first layer set, and a border of the second layer set.
The flexible display panel of claim 2, wherein the first set of layers comprises a cover sheet layer and a first adhesive film layer.
The flexible display panel of claim 3, wherein the first layer of adhesive film covers at least a portion of the display layer and the second layer set to form the wrap.
The flexible display panel of claim 4,

the first adhesive film layer is provided with an extension part with the length exceeding the length of the corresponding display layer along the direction parallel to the preset axis, and the extension part extends to the lower surface of the second layer group to form the wrapping piece.
The flexible display panel according to claim 5, 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.
The flexible display panel of claim 5, wherein the thickness of the portion of the first adhesive film layer extending to the lower surface of the second layer set is between 0.025mm and 0.5 mm.
The flexible display panel of claim 3, wherein the material of the first adhesive film layer comprises an optically clear adhesive.
The flexible display panel of claim 2, wherein the second layer set comprises a support layer and a second adhesive film layer.
The flexible display panel of claim 9, wherein the second layer of adhesive film covers at least a portion of the display layer and the first layer set to form the wrap.
The flexible display panel of claim 10,

the second adhesive film layer is provided with an extension part with the length exceeding that of the corresponding display layer along the direction parallel to the preset axis, and the extension part extends to the upper surface of the first layer group to form the wrapping part.
The flexible display panel of claim 11, wherein the portion of the second adhesive film layer extending to the upper surface of the first layer set has a length in a direction parallel to the predetermined axis of between 0.7mm and 3 mm.
The flexible display panel of claim 11, wherein the portion of the second adhesive film layer extending to the upper surface of the first set of layers has a thickness of between 0.025mm and 0.5 mm.
The flexible display panel of any of claims 9, wherein the material of the second adhesive film layer comprises a pressure sensitive adhesive or an optically clear adhesive.
The flexible display panel of claim 2, wherein the first layer set comprises a cover sheet layer and a first adhesive film layer, wherein the second layer set comprises a support layer and a second adhesive film layer, and wherein the first adhesive film layer and the second adhesive film layer are bonded to each other to form the cover.
The flexible display panel of claim 15,

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

the second adhesive film layer has a second extension portion having a length exceeding a length of the corresponding display layer in a direction parallel to the predetermined axis;

the first extension part and the second extension part are mutually jointed to form the cladding piece.
The flexible display panel of claim 16, wherein the first adhesive film layer and the second adhesive film layer are the same material.
The flexible display panel of claim 2, wherein the second layer group comprises a buffer film layer.
The flexible display panel of claim 18, wherein the buffer film layer encapsulates the display layer and at least a portion of the first layer group to form the encapsulation.
The flexible display panel of claim 19,

the buffer film layer is provided with an extension part with a length exceeding that of the corresponding display layer along a direction parallel to the preset axis, and the extension part extends to the upper surface of the first layer group to form the wrapping part.
The flexible display panel of claim 20, wherein the portion of the buffer film layer extending to the upper surface of the first layer set has a length in a direction parallel to the predetermined axis of between 0.7mm and 3 mm.
The flexible display panel of claim 20, wherein the portion of the buffer film layer extending to the upper surface of the first layer set has a thickness of between 0.025mm and 0.5 mm.
The flexible display panel of claim 18, wherein the material of the buffer film layer comprises foam, gel, or silicone.
The flexible display panel of claim 2, wherein the outer surface of the enveloping portion of the wrapping is non-tacky.
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.
The flexible display panel of claim 25, wherein the bumps are spaced 0.1mm-2mm apart in a direction perpendicular to the predetermined axis.
The flexible display panel of claim 25, wherein the shape of the boss comprises a hemisphere, a rodent, and a stripe.
The flexible display panel of claim 25, wherein the bosses are machined into the support layer.
The flexible display panel of claim 25, wherein the bosses are bonded to a lower surface of the support layer.
The flexible display panel of claim 25, wherein the material of the boss comprises steel sheet, alloy, or glass.
A display device comprising a flexible display panel, the flexible display panel comprising:

a display layer, a first layer group located above the display layer, and a second layer group located below the display layer; at least part of the flexible display panel may be bent around a predetermined axis with a bending angle larger than 120 °;

the first layer set comprises at least one film layer;

the second layer set includes at least one support layer comprising a rigid material.
The display device according to claim 31, further comprising:

a hinge around which at least a portion of the flexible display panel is bendable;

the 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 flexible display panel to move along the direction perpendicular to the display surface.
A display device as claimed in claim 31, wherein at least part of the non-display area of the flexible display panel in a direction parallel to the predetermined axis slides in the spacing groove in a first direction.
The display device according to claim 33, wherein a plurality of protrusions are distributed on an upper surface and/or a lower surface of a region of the flexible display panel inside the position-limiting groove, and the protrusions can reduce a contact area between the flexible display panel and the position-limiting groove.
The display device of claim 34, wherein the shape of the protrusion comprises a hemisphere, a rodent, or a great wall.