Foldable display module and foldable display device

Abstract

A foldable display module comprises a supporting layer, a bonding layer, a flexible display panel and a protective layer. And the bonding layer is positioned on the supporting layer. The flexible display panel is located on the bonding layer, the flexible display panel comprises a plurality of first display parts and at least one second display part, the first display parts are sequentially arranged in the first direction, the second display part is located between every two adjacent first display parts, the second display part can be bent, and the second display part is located between the first display parts and the second display part. The bent axis is in the second direction; the second display part is provided with a non-glue area and glue areas located on the two opposite sides of the non-glue area in the second direction; the first direction is perpendicular to the second direction. The protective layer is located on the flexible display panel. Wherein the adhesive layer comprises a plurality of first adhesive parts and a plurality of second adhesive parts, the first adhesive parts are arranged between the first display part and the supporting layer, and the adhesive area is provided with at least one second adhesive part.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a foldable display module and a foldable display device. Background Art

[0002] Display devices are used in all aspects of life, wherein the display devices include foldable display devices, which can switch between a flat state and a folded state. In the flat state, the foldable display device has a larger display area, which can improve the viewing effect. In the folded state, the foldable display device has a smaller volume, which can be convenient for users to carry. Summary of the invention

[0003] On the one hand, a foldable display module is provided. The foldable display module includes a supporting layer, an adhesive layer, a flexible display panel and a protective layer. The adhesive layer is located on the supporting layer. The flexible display panel is located on the adhesive layer, and the flexible display panel includes a plurality of first display parts and at least one second display part, the plurality of first display parts are arranged in sequence along a first direction, the second display part is located between two adjacent first display parts, the second display part can be bent, and the bending axis is along a second direction; the second display part has a non-glue area, and glue areas are located on opposite sides of the non-glue area along the second direction; the first direction and the second direction are perpendicular. The protective layer is located on the flexible display panel. Among them, the adhesive layer includes a plurality of first adhesive parts and a plurality of second adhesive parts, a first adhesive part is arranged between a first display part and the supporting layer, and at least one second adhesive part is arranged in a glue area.

[0004] In some embodiments, the second adhesive portion is in a strip shape; along the first direction, the second adhesive portion is connected to two first adhesive portions located on opposite sides thereof.

[0005] In some embodiments, a side boundary of the second adhesive portion close to the adhesive-free area is curved, and the boundary protrudes toward the adhesive-free area.

[0006] In some embodiments, the connection position between the second adhesive portion and the first adhesive portion is chamfered.

[0007] In some embodiments, the second adhesive portion includes a connecting portion and a plurality of protruding portions. Along the first direction, the connecting portion is connected to two first adhesive portions located on opposite sides thereof; the connecting portion is connected to a plurality of protruding portions, the plurality of protruding portions are arranged on a side of the connecting portion close to the adhesive-free area, and the plurality of protruding portions are arranged at intervals along the first direction.

[0008] In some embodiments, along the first direction, the lengths of the plurality of protrusions first increase and then decrease; the length of a protrusion is the maximum dimension of the protrusion along the second direction.

[0009] In some embodiments, the connection position between the protrusion and the connection portion is chamfered.

[0010] In some embodiments, the protrusion is arranged at one end away from the connecting portion and has a rounded corner.

[0011] In some embodiments, along the second direction, the maximum dimension of the second bonding portion ranges from 5 mm to 10 mm.

[0012] In some embodiments, the non-adhesive area has a center line along the first direction. The second bonding parts in the two adhesive areas are symmetrically arranged about the center line.

[0013] In some embodiments, a plurality of through holes are formed on the support layer, and orthographic projections of the plurality of through holes on the second display portion are located within the glue-free area.

[0014] In some embodiments, the first adhesive portion and the second adhesive portion are an integral structure.

[0015] In some embodiments, the protective layer includes a first substrate layer and a first hardened coating layer. The first substrate layer is located on the flexible display panel. The first hardened coating layer is disposed on a side of the first substrate layer away from the flexible display panel; the foldable display module further includes at least one second hardened coating layer disposed between the first substrate layer and the flexible display panel.

[0016] In some embodiments, when the number of the second hardened coating layer is one layer, the foldable display module further includes a second substrate layer disposed between the first substrate layer and the second hardened coating layer.

[0017] In some embodiments, the thickness of the second substrate layer is less than the thickness of the first substrate layer.

[0018] In some embodiments, when the number of the second hardened coating layers is multiple layers, the foldable display module further includes: a third substrate layer disposed between two adjacent layers of the second hardened coating layers.

[0019] In some embodiments, the thickness of the second hardening coating layer is less than the thickness of the first hardening coating layer.

[0020] In another aspect, a foldable display device is provided, comprising a foldable display module and a middle frame, wherein the middle frame is arranged on a non-light-emitting side of the foldable display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present application, the following briefly introduces the drawings required to be used in some embodiments of the present application. Obviously, the drawings described below are only drawings of some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not intended to limit the actual size of the products involved in the embodiments of the present application.

[0022] Figure 1 is a structural diagram of a foldable display module in a flattened state according to some embodiments;

[0023] Figure 2 is a structural diagram of a foldable display module in a folded state according to some embodiments;

[0024] Figure 3 is a structural diagram of a foldable display module in an intermediate state according to some embodiments;

[0025] Figure 4 is a structural diagram of a foldable display device according to some embodiments;

[0026] Figure 5 is another structural diagram of a foldable display device according to some embodiments;

[0027] Figure 6 is a structural diagram of a foldable display module according to some embodiments;

[0028] Figure 7 is another structural diagram of a foldable display module according to some embodiments;

[0029] Figure 8 is another structural diagram of a foldable display module according to some embodiments;

[0030] Fig. 9 is another structural diagram of a foldable display module according to some embodiments;

[0031] Fig.10 is another structural diagram of a foldable display module according to some embodiments;

[0032] Fig.11 is another structural diagram of a foldable display module according to some embodiments;

[0033] Fig. 12A is another structural diagram of a foldable display device according to some embodiments;

[0034] Fig. 12B is another structural diagram of a foldable display device according to some embodiments;

[0035] Fig.13 A structural diagram of a support layer of a foldable display module according to some embodiments;

[0036] Fig.14 A structural diagram of a foldable display module in an implementable manner;

[0037] Fig.15 Another structural diagram of a foldable display module in an implementable manner;

[0038] Fig.16 A structural diagram of a foldable display module in another possible implementation manner;

[0039] Fig.17 is another structural diagram of a foldable display module in another possible implementation manner;

[0040] Fig.18 A simulation diagram of a foldable display module in another possible implementation manner;

[0041] Fig.19 is another structural diagram of a foldable display module according to some embodiments;

[0042] Fig. 20A for Fig.19 A cross-sectional view at C-C';

[0043] Fig. 20B for Fig.19 Another cross-sectional view at C-C';

[0044] Fig.21 is a bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0045] Fig. 22 is a simulation diagram of a foldable display module according to some embodiments;

[0046] Fig.23 is another structural diagram of a support layer of a foldable display module according to some embodiments;

[0047] Fig.24 for Fig.19 Sectional view at D-D';

[0048] Fig.25 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0049] Fig.26 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0050] Fig. 27 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0051] Fig.28 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0052] Fig.29 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0053] Fig.30 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0054] Fig.31 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0055] Fig.32 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0056] Fig.33 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0057] Fig.34 is another bottom view of a flexible display panel and an adhesive layer according to some embodiments;

[0058] Fig.35 is another structural diagram of a foldable display device according to some embodiments;

[0059] Fig.36 A structural diagram of the attachment of the support layer, the buffer layer, and the fourth fixed sublayer as a whole to the back film and the flexible display panel according to some embodiments;

[0060] Fig.37 is another structural diagram of a foldable display module according to some embodiments;

[0061] Fig.38 is another structural diagram of a foldable display device according to some embodiments;

[0062] Fig.39 is another structural diagram of a foldable display device according to some embodiments. DETAILED DESCRIPTION

[0063] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments provided by the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present application.

[0064] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any appropriate manner.

[0065] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0066] When describing some embodiments, the expression "connection" and its derivatives may be used. The term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0067] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0068] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0069] As used herein, "perpendicular" and "equal" include the described situations and situations similar to the described situations, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, that the difference between the two equalities is less than or equal to 5% of either one of them.

[0070] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0071] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0072] With the continuous development of display technology, foldable display devices, as a new type of display device, are becoming more and more popular and are gradually being applied to all aspects of life.

[0073] Based on this, some embodiments of the present application provide a foldable display device. The foldable display device includes but is not limited to a notebook computer, a tablet personal computer, a mobile phone, a laptop computer, a personal digital assistant (PDA), a personal computer, a navigator, a vehicle-mounted device, a wearable device (such as a smart watch), an augmented reality (AR) device, a virtual reality (VR) device, and any other product or component with a display function. The embodiments of the present application do not impose any special restrictions on the specific form of the above-mentioned foldable display device.

[0074] For the convenience of subsequent description and illustration, the present application takes the foldable display device as a mobile phone as an example for description, but this cannot be regarded as a specific limitation on the structural form of the foldable display device.

[0075] It is understandable that under different usage requirements, such as Figure 1 As shown, the foldable display device 01 can be unfolded to a flat state, such as Figure 2 As shown, it can also be folded to a folded state, such as Figure 3 As shown, it can also be in an intermediate state between the flattened state and the folded state. That is, the foldable display device 01 has at least two states, namely the flattened state and the folded state. In some cases, the foldable display device 01 can further include a third state, namely an intermediate state between the flattened state and the folded state. It can be understood that the intermediate state can be that the foldable display device 01 is in any one or more states between the flattened state and the folded state, rather than a unique state.

[0076] For example, when the user needs to carry the foldable display device 01 for traveling, the foldable display device 01 can be placed in a folded state, thereby reducing the volume of the foldable display device 01 for easy carrying. For another example, when the user needs to use the foldable display device 01 for watching a movie, the foldable display device 01 can be placed in a flat state, thereby increasing the viewing area, improving the viewing effect, and improving the user experience.

[0077] In some embodiments, Figure 4 As shown, the foldable display device 01 includes a foldable display module 10 and a middle frame 20, and the middle frame 20 is arranged on the non-light-emitting side of the foldable display module 10. The foldable display module 10 can realize image display. The middle frame 20 can provide support and protection for the foldable display module 10.

[0078] It can be understood that the foldable display module 10 has a light-emitting side and a non-light-emitting side, where the light-emitting side refers to a side of the foldable display module 10 that can emit light, and the non-light-emitting side refers to a side opposite to the light-emitting side.

[0079] Optionally, the foldable display module 10 further includes a back cover located on a side of the middle frame 20 away from the foldable display module 10 , and electronic components such as a circuit board, a camera, and a battery located between the middle frame 20 and the back cover.

[0080] In some embodiments, Figure 5 As shown, the foldable display module 10 includes a flexible display panel 1 .

[0081] It can be understood that, according to the different folding directions of the flexible display panel 1, the foldable display device 01 can be divided into an inner folding device and an outer folding device. Among them, the inner folding device means that when the foldable display device 01 is in a folded state, the image displayed by the flexible display panel 1 cannot be seen by the user; when the foldable display device 01 is in a flattened state, the image displayed by the flexible display panel 1 can be viewed by the user. The outer folding device means that when the foldable display device 01 is in a folded state, the image displayed by the flexible display panel 1 can be seen by the user.

[0082] Among them, the embodiment drawings of the present application are illustrated by taking the foldable display device 01 as an inner folding device as an example.

[0083] In some examples, the flexible display panel 1 may be an organic light emitting diode (OLED) display panel, a quantum dot light emitting diode (QLED) display panel, etc. Among them, the OLED display panel is a self-luminous display panel, and does not need to be provided with a backlight module (BLM), which is conducive to reducing the thickness and structural complexity of the foldable display device 01.

[0084] Exemplarily, the OLED display panel may be an active matrix organic light emitting diode (AMOLED) display panel.

[0085] In some examples, the thickness of the flexible display panel 1 ranges from 20 μm to 50 μm. For example, the thickness of the flexible display panel 1 may be 20 μm, 25 μm, 30 μm, 40 μm, 42 μm, 43 μm, 47 μm or 50 μm.

[0086] In some examples, the flexible display panel 1 may include a substrate and a film stack structure (including but not limited to pixel circuits, light-emitting devices, shift registers, etc.) disposed on the substrate. The substrate provides support for the film stack structure, and the film stack structure performs image display.

[0087] Illustratively, the substrate may be made of a flexible resin material, including but not limited to polyethylene terephthalate (PET).

[0088] In some examples, such as Figure 1 , Figure 5As shown, the flexible display panel 1 includes a plurality of first display portions 1a and at least one second display portion 1b. For example, when the foldable display device 01 is in a flattened state, the plurality of first display portions 1a are sequentially arranged along a first direction X, and the second display portion 1b is located between two adjacent first display portions 1a. The second display portion 1b is bendable, and the bending axis is along a second direction Y. The first direction X and the second direction Y are perpendicular.

[0089] Through the above arrangement, during the folding process of the foldable display device 01, the first display portion 1a can rotate with the second display portion 1b connected thereto as an axis. When the foldable display device 01 is in a flattened state, the flexible display panel 1 is also in a flattened state. When the foldable display device 01 is in a folded state, the flexible display panel 1 is also in a folded state. When the foldable display device 01 is in an intermediate state, the flexible display panel 1 is also in an intermediate state.

[0090] Exemplarily, the first display portion 1a may be in a plate shape or a plane shape. The second display portion 1b may be in a strip shape extending along the second direction Y. The plurality of first display portions 1a and the second display portions 1b are an integrally formed structure.

[0091] It can be understood that the number of the first display parts 1a and the number of the second display parts 1b can be determined according to the number of times the foldable display device 01 can be folded. For example, when the foldable display device 01 is folded only once, the number of the first display parts 1a can be two, and the number of the second display parts 1b can be one. For another example, when the foldable display device 01 can be folded twice, the number of the first display parts 1a can be three, and the number of the second display parts 1b can be two.

[0092] For the convenience of subsequent description and accompanying drawings, Figure 5 As shown, the present application takes the flexible display panel 1 including two first display parts 1a and one second display part 1b as an example for description. Figure 5 As shown, the two first display portions 1a are respectively a first display sub-portion 1a1 and a second display sub-portion 1a2.

[0093] In the relevant drawings, the dotted line A1 is used as the boundary between the first display sub-portion 1a1 and the second display portion 1b on the left, and the dotted line A2 is used as the boundary between the second display sub-portion 1a2 and the second display portion 1b on the right.

[0094] In this case, when the foldable display device 01 includes the middle frame 20, exemplarily, as Figure 5As shown, the middle frame 20 includes a first sub-frame 2a, a second sub-frame 2b and a rotating mechanism 2c, wherein the first sub-frame 2a and the second sub-frame 2b are both connected to the rotating mechanism 2c, and the rotating mechanism 2c is located between the first sub-frame 2a and the second sub-frame 2b, and the first sub-frame 2a and the second sub-frame 2b can rotate around the rotating mechanism 2c. The first sub-frame 2a is arranged on the non-light-emitting side of the first display sub-section 1a1, the second sub-frame 2b is arranged on the non-light-emitting side of the second display sub-section 1a2, and the second display section 1b is opposite to the rotating mechanism 2c.

[0095] The materials of the first sub-frame 2a and the second sub-frame 2b may include but are not limited to metal, glass, plastic or ceramic.

[0096] In addition, the rotating mechanism 2c can be a structure such as a hinge or a rotating shaft.

[0097] In this way, during the folding process of the foldable display device 01, the first subframe 2a can rotate around the rotating mechanism 2c, thereby driving the first display sub-unit 1a1 to rotate. The second subframe 2b can rotate around the rotating mechanism 2c, thereby driving the second display sub-unit 1a2 to rotate. In this way, the flexible display panel 1 can be folded.

[0098] When the user is using the foldable display device 01, the foldable display device 01 may fall. Since the flexible display panel 1 has a film stacking structure that needs to be directly involved in the display process, the film stacking structure needs to be protected to ensure the normal display function of the flexible display panel 1.

[0099] Based on this, in some embodiments, such as Figure 5 As shown, the foldable display module 10 further includes a protective layer 3, which is disposed on the flexible display panel 1, that is, the protective layer 3 is located on the light-emitting side of the flexible display panel 1. The protective layer 3 can improve the surface structural strength of the flexible display panel 1, reduce the probability of the flexible display panel 1 being broken in the event of a collision, improve the reliability of the foldable display module 10, and further improve the reliability of the foldable display device 01.

[0100] It can be understood that the flexible display panel 1 has a light emitting side and a backlight side. The light emitting side of the flexible display panel 1 refers to the side from which the flexible display panel 1 can emit light, and the backlight side of the flexible display panel 1 refers to the side opposite to the light emitting side.

[0101] In some examples, such as Figure 6As shown, the protective layer 3 includes a first substrate layer 31 and a first hard coating layer 32 (hard coating, HC). The first substrate layer 31 is disposed between the first hard coating layer 32 and the flexible display panel 1. The first substrate layer 31 provides support for the first hard coating layer 32 and provides protection for the flexible display panel 1. The first hard coating layer 32 improves the structural strength of the surface of the first substrate layer 31, thereby improving the surface structural strength of the flexible display panel 1.

[0102] Exemplarily, the thickness of the first hardened coating layer 32 ranges from 5 μm to 11 μm. For example, the thickness of the first hardened coating layer 32 may be 5 μm, 6 μm, 7 μm, 8 μm or 11 μm. In this way, the thickness of the protective layer 3 is more appropriate, which can facilitate the bending of the foldable display module 10 and facilitate the thin and light design of the foldable display module 10. On the other hand, the protective layer 3 also has good impact resistance, which can improve the structural strength of the surface of the flexible display panel 1, thereby preventing the surface of the flexible display panel 1 from being damaged when it is impacted by external force.

[0103] Optionally, taking the thickness of the first hardened coating layer 32 as 8 μm as an example, the first hardened coating layer 32 of this thickness can not only well meet the bending requirement of the foldable display module 10 , but also well improve the structural strength of the surface of the flexible display panel 1 .

[0104] For example, Figure 7 As shown, the first substrate layer 31 may include a first sub-film 311, a transparent cover plate 312, and a second sub-film 313. The first sub-film 311 is located between the transparent cover plate 312 and the first hardened coating layer 32, and the second sub-film 313 is located between the transparent cover plate 312 and the flexible display panel 1. The transparent cover plate 312 can provide protection for the flexible display panel 1, and the first sub-film 311 and the second sub-film 313 can improve the bendability of the foldable display module 10.

[0105] The material of the transparent cover plate 312 may include ultra-thin glass (UTG), which can be rolled, bent or folded to facilitate the folding of the foldable display module 10. At the same time, the thickness of the ultra-thin glass is much thinner than that of ordinary glass, so the thickness of the foldable display module 10 can be reduced, which is conducive to the lightweight design of the foldable display module 10.

[0106] Exemplarily, the thickness of the transparent cover plate 312 may range from 20 μm to 80 μm. For example, the thickness of the transparent cover plate 312 may be 20 μm, 30 μm, 40 μm, 50 μm or 80 μm.

[0107] In addition, the first sub-film 311 can be made of a flexible resin material. For example, the material can be polyethylene terephthalate, colorless polyimide (CPI) or polyimide (PI). The second sub-film 313 can be made of a flexible resin material. For example, the material can be polyethylene terephthalate, colorless polyimide or polyimide.

[0108] Of course, the first substrate layer 31 may also include only the transparent cover plate 312. Alternatively, the first substrate layer 31 may also include the transparent cover plate 312 and the first sub-film 311. Alternatively, the first substrate layer 31 may also include the transparent cover plate 312 and the second sub-film 313.

[0109] Based on the different structural arrangements of the first substrate layer 31, the foldable display module 10 in some embodiments of the present application further includes at least one fixed sublayer O. The material of the fixed sublayer O may include optically clear adhesive (OCA).

[0110] For example, Figure 8 As shown, in the case where the first substrate layer 31 includes a first sub-film 311, a transparent cover plate 312 and a second sub-film 313, the number of the above-mentioned fixed sub-layers O is three, and the three fixed sub-layers O are respectively the first fixed sub-layer O1, the second fixed sub-layer O2 and the third fixed sub-layer O3. The first fixed sub-layer O1 is arranged between the first sub-film 311 and the transparent cover plate 312. The second fixed sub-layer O2 is arranged between the transparent cover plate 312 and the second sub-film 313. The third fixed sub-layer O3 is arranged between the second sub-film 313 and the flexible display panel 1. In this way, the first sub-film 311, the transparent cover plate 312, the second sub-film 313 and the flexible display panel 1 are fixed to improve the reliability of the foldable display module 10.

[0111] For example, Fig. 9 As shown, when the first substrate layer 31 includes a transparent cover plate 312, the number of the above-mentioned fixed sublayer O is one, and the fixed sublayer O includes a second fixed sublayer O2, and the second fixed sublayer O2 is arranged between the transparent cover plate 312 and the flexible display panel 1. In this way, the transparent cover plate 312 and the flexible display panel 1 are fixed to each other, thereby improving the reliability of the foldable display module 10.

[0112] For example, Fig.10As shown, in the case where the first substrate layer 31 includes a transparent cover plate 312 and a first sub-film 311, the number of the above-mentioned fixed sub-layers O is two, and the two fixed sub-layers O are respectively a first fixed sub-layer O1 and a second fixed sub-layer O2. The first fixed sub-layer O1 is arranged between the first sub-film 311 and the transparent cover plate 312, and the second fixed sub-layer O2 is arranged between the transparent cover plate 312 and the flexible display panel 1. In this way, the first sub-film 311, the transparent cover plate 312 and the flexible display panel 1 are fixed to each other, thereby improving the reliability of the foldable display module 10.

[0113] For example, Fig.11 As shown, in the case where the first substrate layer 31 includes a transparent cover plate 312 and a second sub-film 313, the number of the above-mentioned fixed sub-layers O is two, and the two fixed sub-layers O are respectively a second fixed sub-layer O2 and a third fixed sub-layer O3. The second fixed sub-layer O2 is arranged between the transparent cover plate 312 and the second sub-film 313, and the third fixed sub-layer O3 is arranged between the second sub-film 313 and the flexible display panel 1. In this way, the transparent cover plate 312, the second sub-film 313 and the flexible display panel 1 are fixed to each other, thereby improving the reliability of the foldable display module 10.

[0114] To facilitate subsequent description, the following is a diagram illustrating an example in which the first substrate layer 31 includes a first sub-film 311, a transparent cover plate 312 and a second sub-film 313, and the number of fixed sub-layers O is three, and the three fixed sub-layers O respectively include a first fixed sub-layer O1, a second fixed sub-layer O2 and a third fixed sub-layer O3.

[0115] During the use of the foldable display device 01, in order to ensure that the foldable display device 01 can be stably in a certain state, such as a folded state, a flattened state or an intermediate state, the foldable display device 01 needs to have a certain shaping ability.

[0116] Based on this, Fig. 12A As shown, the foldable display module 10 in some embodiments of the present application further includes a support layer 4, which is disposed between the flexible display panel 1 and the middle frame 20, that is, the flexible display panel 1 is disposed on the support layer 4. In this way, when the foldable display device 01 is unfolded or folded, the middle frame 20 will unfold or fold accordingly, and drive the support layer 4 to unfold or fold, thereby driving the flexible display panel 1 to unfold or fold. The middle frame 20 and the support layer 4 cooperate with each other, so that the flexible display panel 1 can be stably in any suitable state among the folded state, the flattened state or the intermediate state, so as to exert the shaping effect on the flexible display panel 1.

[0117] In addition, since the support layer 4 has a certain rigidity, the support layer 4 can provide good support and protection for the flexible display panel 1 , so as to improve the impact resistance of the flexible display panel 1 on the side close to the support layer 4 .

[0118] Exemplarily, the material of the support layer 4 may include metal. Optionally, the metal material may include stainless steel SUS, titanium alloy, carbon fiber, etc. Of course, the material of the support layer 4 may also include other materials with certain toughness and rigidity.

[0119] In some examples, the thickness of the support layer 4 ranges from 110 μm to 150 μm, for example, the thickness of the support layer 4 may be 110 μm, 115 μm, 117 μm, 120 μm, 130 μm, 140 μm or 150 μm. In this way, the thickness of the support layer 4 is more appropriate, which is beneficial to the thin and light design of the foldable display module 10 and can facilitate the bending of the foldable display module 10. On the other hand, the support layer 4 has good impact resistance and can well disperse the impact stress to improve the structural strength of the side of the flexible display panel 1 close to the support layer 4, and reduce the probability of damage to the flexible display panel 1 during collision.

[0120] In some examples, the foldable display device 01 in the present application is in a "water drop shape" when in a folded state. Fig. 12B As shown, specifically, along the first direction X, the first display sub-section 1a1 includes a first straight display sub-section 1a11 and a first transition display sub-section 1a12, and the first transition display sub-section 1a12 is located between the first straight display sub-section 1a11 and the second display section 1b. The second display sub-section 1a2 includes a second straight display sub-section 1a22 and a second transition display sub-section 1a21, and the second transition display sub-section 1a21 is located between the second straight display sub-section 1a22 and the second display section 1b.

[0121] Thus, when the foldable display device 01 is in the folded state, the first transition display sub-portion 1a12 is in a semi-bent state, which is used to transition the second transition display sub-portion 1a21 to a semi-bent state, so that the foldable display device 01 is in a "water drop shape" as a whole.

[0122] In this case, if Fig. 12B , Fig.13As shown, the foldable display module 10 in some embodiments of the present application further includes at least one first filling portion 44 and at least one second filling portion 45. At least one first slot body 42 and at least one second slot body 43 are provided on the support layer 4. The opening of the first slot body 42 and the opening of the second slot body 43 are both facing the side away from the flexible display panel 1. The first slot body 42 and the second slot body 43 are both extended perpendicular to the first direction X. The first slot body 42 is located on the left side of the dotted line A1 and is arranged opposite to the first transition display sub-portion 1a12. The second slot body 43 is located on the right side of the dotted line A2 and is arranged opposite to the second transition display sub-portion 1a21. The first filling portion 44 is filled in the first slot body 42, and the second filling portion 45 is filled in the second slot body 43.

[0123] By opening the first groove 42, the thickness of the support layer 4 at the location of the first groove 42 can be reduced. When the foldable display device 01 is in the folded state, the bending stress at the location of the first groove 42 on the support layer 4 can be weakened, and the problem of mutual pulling and separation between the first transition display sub-portion 1a12 and the support layer 4 due to bending can be avoided.

[0124] Similarly, by opening the second groove 43, the thickness of the support layer 4 at the location of the second groove 43 can be reduced. When the foldable display device 01 is in the folded state, the bending stress at the location of the second groove 43 on the support layer 4 can be weakened, and the problem of the second transition display sub-portion 1a21 and the support layer 4 being pulled apart due to bending can be avoided.

[0125] In addition, the provision of the first filling portion 44 and the second filling portion 45 can ensure that the side of the supporting layer 4 away from the flexible display panel 1 remains flat.

[0126] Exemplarily, along a direction perpendicular to the first direction X, the first slot body 42 may penetrate the supporting layer 4 , and the second slot body 43 may penetrate the supporting layer 4 .

[0127] For example, the number of the first slot bodies 42 may be one, two or three, etc. When the number of the first slot bodies 42 is multiple, the multiple first slot bodies 42 may be arranged in sequence and spaced apart along a direction perpendicular to the first direction X. Alternatively, the multiple first slot bodies 42 may be arranged in sequence and spaced apart along the first direction X.

[0128] Similarly, illustratively, the number of the second slot bodies 43 may be one, two or three, etc. When the number of the second slot bodies 43 is multiple, the multiple second slot bodies 43 may be arranged in sequence and spaced apart along a direction perpendicular to the first direction X. Alternatively, they may be arranged in sequence and spaced apart along the first direction X.

[0129] Exemplarily, the depth of the first groove body 42 may be close to half of the thickness of the support layer 4 . The depth of the second groove body 43 may be close to half of the thickness of the support layer 4 .

[0130] For example, when the thickness of the support layer 4 ranges from 110 μm to 150 μm, the depth of the first groove body 42 ranges from 55 μm to 75 μm. For example, the depth of the first groove body 42 may be 55 μm, 60 μm, 65 μm, 68 μm or 75 μm. The depth of the second groove body 43 ranges from 55 μm to 75 μm. For example, the depth of the second groove body 43 may be 55 μm, 60 μm, 65 μm, 68 μm or 75 μm. The depth of the first groove body 42 ranges from 55 μm to 75 μm. For example, the depth of the first groove body 42 may be 55 μm, 60 μm, 65 μm, 68 μm or 75 μm, 64 μm, 67 μm or 75 μm.

[0131] For example, the material of the first filling part 44 may include, but is not limited to, polyethylene terephthalate. The material of the second filling part 45 may include, but is not limited to, polyethylene terephthalate.

[0132] In some examples, such as Fig.13 As shown, a plurality of through holes 41 are provided on the support layer 4. When the foldable display device 01 is in a flattened state, the plane where the support layer 4 is located is a first plane ( Fig.13 The orthographic projections of the plurality of through holes 41 on the first plane are located within the orthographic projections of the second display portion 1b on the first plane. The opening of the through holes 41 can reduce the bending resistance of the support layer 4 and reduce the maximum bending stress of the support layer 4 during the bending process, so that the fatigue resistance of the support layer 4 meets the actual use requirements.

[0133] It can be understood that the number and size of the through holes 41 should be reasonably set according to the material, thickness and size of the supporting layer 4 .

[0134] The plurality of through holes 41 may be any one of elliptical holes, square holes, circular holes or irregularly shaped holes, or a combination of the plurality of holes.

[0135] Exemplarily, the plurality of through holes 41 may be arranged in an array, or may be arranged randomly.

[0136] The support layer 4 and the flexible display panel 1 need to have a stable connection, so in one achievable manner, as Fig.14 , Fig.15 As shown, an adhesive layer 5' is provided between the support layer 4 and the flexible display panel 1. The adhesive layer 5' is provided on a first plane ( Fig.15 The orthographic projection on the plane where the center paper is located) coincides with the orthographic projection of the flexible display panel 1 in the first plane, so that the support layer 4 and the flexible display panel 1 are bonded together by using the adhesive layer 5'.

[0137] However, during each folding process of the foldable display device 01, the second display portion 1b will bend and deform. During the deformation process, the support layer 4 and the second display portion 1b will frequently squeeze the portion of the adhesive layer 5' located between the two, thereby causing the adhesive layer 5' to undergo irreversible deformation. Since the second display portion 1b is bonded to the adhesive layer 5', the deformation of the adhesive layer 5' will be transmitted to the second display portion 1b, so that the second display portion 1b will be deformed along with the deformation of the adhesive layer 5', resulting in folding marks on the second display portion 1b.

[0138] On this basis, if Fig.16 , Fig.17 As shown, in another achievable manner, the portion of the adhesive layer 5' located between the second display portion 1b and the support layer 4 ( Fig.16 as well as Fig.17 The W area in the middle is removed, that is, the glue is cut off, so as to weaken the bending mark on the second display part 1b.

[0139] However, due to the cohesive force in the first hardened coating layer 32 of the protective layer 3, the edge of the protective layer 3 will bend upward to the side away from the flexible display panel 1 under the action of the cohesive force. And because part of the adhesive layer 5' between the second display part 1b and the supporting layer 4 is removed, the second display part 1b is spaced apart from the supporting layer 4 and is not in direct contact with it. Fig.16 As shown, after the protective layer 3 is bonded to the flexible display panel 1, under the action of the upward pulling force of the edge of the protective layer 3, as shown in FIG. Fig.16 , Fig.18 As shown, the edge of the second display portion 1b ( Fig.18 The middle E area) will also appear to be in an upward state, causing the flexible display panel 1 to have an undesirable phenomenon of uneven light and shadow.

[0140] Based on this, Fig.19 As shown, in some embodiments of the present application, the second display portion 1b has a non-glue area I and two glue areas H. For example, the two glue areas H are a first glue area H1 and a second glue area H2. The two glue areas H are respectively located on two opposite sides of the non-glue area I along the second direction Y. Fig.19 As shown, the dotted line B1 is used as the boundary between the first adhesive area H1 and the adhesive-free area I on the left, and the dotted line B2 is used as the boundary between the second adhesive area H2 and the adhesive-free area I on the right.

[0141] like Fig. 20A , Fig.21As shown, in some embodiments of the present application, the adhesive layer 5 included in the foldable display module 10 is located on the support layer 4, and the flexible display panel 1 is located on the adhesive layer 5. The adhesive layer 5 includes a plurality of first adhesive portions 51 and a plurality of second adhesive portions 52. A first adhesive portion 51 is provided between a first display portion 1a and the support layer 4, and at least one second adhesive portion 52 is provided in an adhesive area H.

[0142] It should be explained that the flexible display panel 1 is located on the adhesive layer 5. The flexible display panel 1 may be in direct contact with the adhesive layer 5, or another film layer may be provided between the flexible display panel 1 and the adhesive layer 5, that is, the flexible display panel 1 and the adhesive layer 5 are in indirect contact.

[0143] It can be understood that the first adhesive portion 51 should fill up the area between the first display portion 1 a and the supporting layer 4 .

[0144] It needs to be explained that Fig.21 As shown, the left edge of the first adhesive area H1 coincides with the left edge of the second display part 1b, and the right edge of the second adhesive area H2 coincides with the right edge of the second display part 1b. That is, the left edge of the second display part 1b mentioned above corresponds to the part of the second display part 1b located in the first adhesive area H1, and the right edge of the second display part 1b corresponds to the part of the second display part 1b located in the second adhesive area H2. Therefore, the edge of the second display part 1b mentioned below should have the same meaning as the part of the second display part 1b located in the adhesive area H.

[0145] The areas of the first adhesive region H1 and the second adhesive region H2 may be equal or unequal. For example, the area of ​​the first adhesive region H1 is larger than that of the second adhesive region H2. For another example, the area of ​​the first adhesive region H1 is smaller than that of the second adhesive region H2.

[0146] In some examples, the number of the second bonding portions 52 in the two adhesive areas H may be equal. Fig.21 As shown, the number of the second bonding portions 52 in the two adhesive areas H is one, or the number of the second bonding portions 52 in the two adhesive areas H is three.

[0147] In other examples, the number of second adhesive portions 52 in the two adhesive regions H may be unequal. For example, the number of second adhesive portions 52 in one adhesive region H is one, and the number of second adhesive portions 52 in the other adhesive region H is two. For another example, the number of second adhesive portions 52 in one adhesive region H is two, and the number of second adhesive portions 52 in the other adhesive region H is three.

[0148] When there are multiple second adhesive portions 52 disposed in one adhesive area H, the multiple second adhesive portions 52 may be arranged in an array or randomly.

[0149] In some examples, such as Fig. 20B As shown, the material of the adhesive layer 5 may include a pressure-sensitive adhesive, that is, the material of the first adhesive sub-portion 51A, the second adhesive sub-portion 51B, the third adhesive sub-portion 52A and the fourth adhesive sub-portion 52B is consistent. In this way, the adhesive layer 5 can be ensured to have strong elasticity and not be easily broken, and the stable connection between the support layer 4 and the flexible display panel 1 can still be ensured after the foldable display module 10 is bent for many times. Of course, the adhesive layer 5 can also be made of any other suitable material.

[0150] The thickness of the adhesive layer 5 is in the range of 15 μm to 55 μm. For example, the thickness of the adhesive layer 5 may be 15 μm, 20 μm, 25 μm, 40 μm or 55 μm.

[0151] Optionally, the thickness of the adhesive layer 5 is in the range of 15 μm to 25 μm. For example, the thickness of the adhesive layer 5 may be 15 μm, 17 μm, 20 μm, 23 μm or 25 μm. Such an appropriate thickness of the adhesive layer 5 can not only achieve a stable connection between the support layer 4 and the flexible display panel 1, but also facilitate a lightweight design of the foldable display module 10.

[0152] For example, taking the thickness of the adhesive layer 5 as 20 μm as an example, this can not only achieve a more stable connection between the support layer 4 and the flexible display panel 1 , but also be more conducive to the lightweight design of the foldable display module 10 .

[0153] Of course, if Fig. 20A As shown, the materials of the first bonding sub-section 51A, the second bonding sub-section 51B, the third bonding sub-section 52A and the fourth bonding sub-section 52B may be completely or partially inconsistent.

[0154] For the convenience of the following description, the first bonding portion 51 located between the first display sub-portion 1a1 and the support layer 4 is named as the first bonding sub-portion 51A, and the first bonding portion 51 located between the second display sub-portion 1a2 and the support layer 4 is named as the second bonding sub-portion 51B. The second bonding portion 52 located in the first adhesive area H1 is named as the third bonding sub-portion 52A, and the second bonding portion 52 located in the second adhesive area H2 is named as the fourth bonding sub-portion 52B.

[0155] Through the above arrangement, since the adhesive layer 5 is not arranged in the non-adhesive area I, the portion of the second display portion 1b located in the non-adhesive area I is arranged at an interval between the support layer 4 and is not directly connected. In this way, there is no problem of squeezing the adhesive layer 5 between the support layer 4 and the portion of the second display portion 1b located in the non-adhesive area I, so that during the repeated folding process of the foldable display module 10, the crease phenomenon on the second display portion B can be alleviated.

[0156] Since the second adhesive portion 52 is provided in the adhesive area H, the second adhesive portion 52 can bond the portion of the second display portion 1b located in the adhesive area H to the support layer 4. In this way, even if the protective layer 3 exerts an upward pulling force on the portion of the second display portion 1b located in the adhesive area H, so that the portion of the second display portion 1b located in the adhesive area H has a tendency to warp up, the support layer 4 is connected to the portion of the second display portion 1b located in the adhesive area H through the second adhesive portion 52, and can provide the portion of the second display portion 1b located in the adhesive area H with a downward pulling force close to the support layer 4, thereby balancing the upward pulling force exerted by the protective layer 3 on the portion of the second display portion 1b located in the adhesive area H, so that the portion of the second display portion 1b located in the adhesive area H is pulled down to a nearly flat state, so that the entire flexible display panel 1 is nearly flat, as shown in FIG. Fig. 22 As shown, the phenomenon of uneven light and shadow at the edge of the flexible display panel 1 is improved, thereby improving the display effect of the foldable display module 10.

[0157] In some embodiments, Fig.23 As shown, the orthographic projections of the plurality of through holes 41 on the second display portion 1b are located in the adhesive-free area I. In this way, there are no through holes 41 at the bonding position of the second adhesive portion 52 and the support layer 4, so that a stable connection between the second adhesive portion 52 and the support layer 4 can be achieved, thereby improving the stability of the connection between the support layer 4 and the portion of the second display portion 1b located in the adhesive area H, and better improving the problem of uneven light and shadow on the flexible display panel 1.

[0158] In this case, in some examples, such as Fig.24 As shown, the foldable display module 10 further includes a dustproof layer 6, which is disposed between the middle frame 20 and the support layer 4, and covers a plurality of through holes 41 on the support layer 4. In this way, it is possible to prevent external dust and other debris from entering the space between the support layer 4 and the flexible display panel 1 through the through holes 41, thereby preventing dust and other debris from contaminating the adhesive layer 5, thereby extending the service life of the adhesive layer 5.

[0159] It can be understood that the orthographic projection of the dustproof layer 6 on the first plane may overlap with the orthographic projection of the second display portion 1b in the first plane. Alternatively, the orthographic projection of the dustproof layer 6 on the first plane may partially overlap with the orthographic projection of the second display portion 1b in the first plane, and another part overlap with the orthographic projection of the first display portion 1a in the first plane.

[0160] When the second adhesive portion 52 is used to bond the support layer 4 and the flexible display panel 1 , it is necessary to ensure the stability of the bonding between the flexible display panel 1 and the support layer 4 .

[0161] Based on this, Fig.25 As shown, in some embodiments, along the second direction Y, the maximum size L of the second adhesive portion 52 ranges from 5 mm to 10 mm. Within this range, the size of the second adhesive portion 52 in the second direction Y is more appropriate. Thus, on the one hand, the second adhesive portion 52 can stably adhere the portion of the second display portion 1b located in the adhesive area H to the support layer 4, thereby preventing the portion of the second display portion 1b located in the adhesive area H from warping upward to the side away from the support layer 4. On the other hand, after the foldable display module 10 is repeatedly folded, the second adhesive portion 52 within this size range can also reduce the bending marks on the second display portion 1b, thereby improving the appearance of the flexible display panel 1.

[0162] Exemplarily, the maximum size L range of the second adhesive portion 52 may refer to the maximum size L range of the third adhesive sub-portion 52A and / or the maximum size L range of the fourth adhesive sub-portion 52B.

[0163] It should be explained that, along the second direction Y, the maximum size of the second adhesive portion 52 includes the following two situations.

[0164] The first one, such as Fig.21 As shown, in the second direction Y, when the size of the second bonding portion 52 is equal everywhere, the maximum size of the second bonding portion 52 refers to the size of the second bonding portion 52.

[0165] The second type, such as Fig.25 As shown, in the second direction Y, when the size of the second bonding portion 52 is not uniform, the maximum size of the second bonding portion 52 refers to the size of the largest portion of the second bonding portion 52 .

[0166] For example, along the second direction Y, the maximum size of the second adhesive portion 52 may be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm. In this way, the size of the second adhesive portion 52 in the second direction Y is more appropriate. On the one hand, the support layer 4 and the second display portion 1b can be bonded together more stably, and the upward warping of the edge of the second display portion 1b can be better reduced, and the phenomenon of uneven light and shadow of the flexible display panel 1 can be better improved; on the other hand, the bending marks on the second display portion 1b can be better reduced, and the overall appearance of the foldable display module 10 can be improved.

[0167] For example, taking the maximum size of the second adhesive portion 52 as 8 mm, this can not only ensure the stable connection between the portion of the second display portion 1b located in the adhesive area H and the support layer 4 to a greater extent, but also better weaken the bending marks on the second display portion 1b, thereby improving the overall appearance of the foldable display module 10.

[0168] It can be understood that due to certain uncontrollable errors (such as manufacturing process errors, equipment accuracy, measurement errors, etc.), when the error floating range of the maximum size of the second bonding part 52 along the second direction Y fluctuates within the range of 5%×8mm, it can also be considered that the maximum size of the second bonding part 52 satisfies and is equal to 8mm.

[0169] In some embodiments, Fig.26 As shown, the non-glue area I has a center line N along the first direction X. The second adhesive portions 52 in the two adhesive areas H are symmetrically arranged about the center line N. In this way, the adhesive forces of the second adhesive portions 52 on both sides of the center line N acting on the second display portion 1b and the support layer 4 are in a balanced state, which can not only stably connect the support layer 4 and the part of the second display portion 1b located in the adhesive area H to improve the degree of warping of the edge of the flexible display panel 1, but also avoid misalignment between the support layer 4 and the second display portion 1b during the bending process of the foldable display module 10, so as to keep the foldable display module 10 in a normal state and avoid abnormal folding.

[0170] It can be understood that the areas of the second bonding portions 52 in the two adhesive areas H should be equal. Exemplarily, the area of ​​the third bonding sub-portion 52A is equal to the area of ​​the fourth bonding sub-portion 52B.

[0171] The symmetrical arrangement means that the second adhesive portion 52 in the first adhesive area H1 can overlap with the second adhesive portion 52 in the second adhesive area H2 after being turned 180° about the symmetry axis I. For example, the third adhesive sub-portion 52A can overlap with the fourth adhesive sub-portion 52B after being turned 180° about the symmetry axis I.

[0172] In some examples, the number of the third adhesive sub-sections 52A and the number of the fourth adhesive sub-sections 52B should be equal. For example, if the number of the third adhesive sub-sections 52A is one, the number of the fourth adhesive sub-sections 52B is also one. Alternatively, if the number of the third adhesive sub-sections 52A is three, the number of the fourth adhesive sub-sections 52B is also three.

[0173] In some examples, the third adhesive sub-portion 52A may fill the first adhesive area H1, thereby increasing the connection stability between the support layer 4 and the portion of the second display portion 1b located in the first adhesive area H1 to a greater extent. Alternatively, the third adhesive sub-portion 52A may also occupy a portion of the first adhesive area H1.

[0174] In some examples, the fourth adhesive sub-portion 52B may fill the second adhesive area H2, so as to increase the connection stability between the support layer 4 and the portion of the second display portion 1b located in the second adhesive area H2 to a greater extent. Alternatively, the fourth adhesive sub-portion 52B may also occupy a portion of the second adhesive area H2.

[0175] In the process of actually setting the second adhesive portion 52, the second adhesive portion 52 can have various forms, as long as the second display portion 1b can be bonded to the support layer 4. For example, the second adhesive portion 52 can be in a strip shape, or the second adhesive portion 52 can also include a connecting portion 521 and a plurality of protruding portions 522. In order to more clearly understand the form of the second adhesive portion 52, the form of the second adhesive portion 52 is described in detail below.

[0176] In a possible embodiment, Fig. 27 As shown, the second adhesive portion 52 is in a strip shape. Along the first direction X, the second adhesive portion 52 is connected to the two first adhesive portions 51 located on opposite sides thereof. In this way, along the first direction X, the second adhesive portion 52 can span the entire adhesive area H, and more firmly bond the support layer 4 and the second display portion 1b together, thereby better reducing the upward warping amplitude of the portion of the second display portion 1b located in the adhesive area H, and better improving the phenomenon of uneven light and shadow of the flexible display panel 1.

[0177] Exemplarily, along the first direction X, the third adhesive sub-portion 52A may be connected to the first adhesive sub-portion 51A and the second adhesive sub-portion 51B, respectively. And / or, the fourth adhesive sub-portion 52B may be connected to the first adhesive sub-portion 51A and the second adhesive sub-portion 51B, respectively.

[0178] The first adhesive portion 51 and the second adhesive portion 52 may be an integral structure, so as to increase the connection strength between the first adhesive portion 51 and the second adhesive portion 52, thereby improving the overall structural strength of the first adhesive portion 51 and the second adhesive portion 52, thereby more stably connecting the flexible display panel 1 and the support layer 4 together.

[0179] In addition, the second adhesive portion 52 may be a square structure, such as a rectangle or a square, and since the second adhesive portion 52 has a regular shape, it is easy to set the second adhesive portion 52. Alternatively, the second adhesive portion 52 may also be a parallelogram structure, or an irregular curved structure.

[0180] For example, Fig. 27 As shown, the number of the third adhesive sub-portions 52A and the number of the fourth adhesive sub-portions 52B are both one, the upper boundary of the two boundaries of the third adhesive sub-portion 52A arranged along the first direction X coincides with the dotted line A1, the lower boundary of the two boundaries of the third adhesive sub-portion 52A arranged along the first direction X coincides with the dotted line A2, and the boundary of the two boundaries of the third adhesive sub-portion 52A arranged along the second direction Y away from the glue-free area I coincides with the boundary of the second display portion 1b.

[0181] The upper boundary of the two boundaries of the fourth adhesive sub-portion 52B arranged along the first direction X coincides with the dotted line A1, the lower boundary of the two boundaries of the fourth adhesive sub-portion 52B arranged along the first direction X coincides with the dotted line A2, and the boundary of the two boundaries of the fourth adhesive sub-portion 52B arranged along the second direction Y, which is away from the glue-free area I, coincides with the boundary of the second display portion 1b.

[0182] In this way, the adhesive layer 5 is in a frame-shaped structure, that is, there is an opening surrounded by the first adhesive portion 51 and the second adhesive portion 52 in the middle of the adhesive layer 5, and the adhesive-free area I on the second display portion 1b is located within the range of the opening. The shape of the opening can be square, circular, diamond, elliptical, etc.

[0183] Based on the above-mentioned design of the second bonding portion 52 being in a strip shape, in some embodiments, such as Fig.28 As shown in FIG. 1 , the boundary of the second adhesive portion 52 near the adhesive-free area I is in a curved shape, and the boundary is convex toward the adhesive-free area I. In this way, the boundary of the second adhesive portion 52 near the adhesive-free area I is in a parabolic shape. Fig.18 The edge of the second display portion 1b matches the upward warping state in the simulation experiment shown in , so that the edge of the second display portion 1b and the supporting layer 4 can be fixed more specifically to better improve the upward warping of the edge of the second display portion 1b and improve the uneven light and shadow phenomenon of the flexible display panel 1.

[0184] Exemplarily, a side boundary of the third bonding sub-portion 52A close to the glue-free area I is curved, and the boundary protrudes toward the glue-free area I. And / or a side boundary of the fourth bonding sub-portion 52B close to the glue-free area I is curved, and the boundary protrudes toward the glue-free area I.

[0185] In the actual production process of the foldable display module 10, the adhesive layer 5 is generally pasted between the support layer 4 and the flexible display panel 1 at one time. However, since the first adhesive portion 51 and the second adhesive portion 52 are located in different positions and have different shapes, it is necessary to use cutting processing technology to process a suitable adhesive layer 5 before bonding.

[0186] Based on this, in some embodiments, such as Fig.29 As shown, the connection position of the second bonding part 52 and the first bonding part 51 is chamfered. In this way, when using a tool to cut to form the first bonding part 51 and the second bonding part 52, it can be convenient to cut and discharge the connection between the first bonding part 51 and the second bonding part 52 (remove the excess part of the bonding layer 5). The chamfered structure can also reduce the requirements for the tool and reduce the processing cost.

[0187] Exemplarily, the connection position between the first bonding sub-section 51A and the third bonding sub-section 52A is chamfered. And / or, the connection position between the first bonding sub-section 51A and the fourth bonding sub-section 52B is chamfered. And / or, the connection position between the second bonding sub-section 51B and the third bonding sub-section 52A is chamfered. And / or, the connection position between the second bonding sub-section 51B and the fourth bonding sub-section 52B is chamfered.

[0188] The connecting position between the second adhesive portion 52 and the first adhesive portion 51 is chamfered, which may be a rounded corner or a chamfered angle.

[0189] When the connection position of the second bonding portion 52 and the first bonding portion 51 is rounded, the radius of the rounded corner can be set according to actual needs. When the connection position of the second bonding portion 52 and the first bonding portion 51 is chamfered, the inclination of the hypotenuse of the chamfer can be 45° or 60°.

[0190] In some examples, such as Fig.29 As shown, along the second direction Y, when the boundary of the second adhesive portion 52 away from the glue-free area I coincides with the boundary of the flexible display panel 1, only the connection between the boundary of one side of the second adhesive portion 52 close to the glue-free area I and the first adhesive portion 51 is chamfered.

[0191] In other examples, such as Fig.30 As shown, along the second direction Y, when the second bonding portion 52 is a certain distance away from the boundary of the glue-free area I and the boundary of the flexible display panel 1, both the connection between the side boundary of the second bonding portion 52 close to the glue-free area I and the first bonding portion 51 can be chamfered, and the connection between the side boundary of the second bonding portion 52 away from the glue-free area I and the first bonding portion 51 can be chamfered.

[0192] In another possible embodiment, Fig.31 As shown, the second bonding portion 52 includes a connecting portion 521 and a plurality of protruding portions 522. Along the first direction X, the connecting portion 521 is connected to two first bonding portions 51 located on opposite sides thereof. The plurality of protruding portions 522 are connected to the connecting portion 521, and the plurality of protruding portions 522 are disposed on one side of the connecting portion 521 close to the adhesive-free area I, and the plurality of protruding portions 522 are arranged at intervals along the first direction X.

[0193] The second bonding portion 52 is formed by providing a connecting portion 521 and a plurality of protruding portions 522 to achieve bonding between the support layer 4 and the second display portion 1b, thereby preventing the edge of the second display portion 1b from warping up, thereby improving the light and shadow irregularity of the flexible display panel 1. In addition, during the folding process of the foldable display module 10, since the plurality of protruding portions 522 are arranged at intervals, the gap between two adjacent protruding portions 522 can provide a deformation space for the second bonding portion 52, so as to facilitate the folding of the foldable display module 10.

[0194] Exemplarily, the third bonding sub-section 52A includes a connecting section 521 and a plurality of protruding sections 522 , and / or the fourth bonding sub-section 52B includes a connecting section 521 and a plurality of protruding sections 522 .

[0195] It can be understood that, in this case, along the second direction Y, the maximum dimension of the second adhesive portion 52 refers to the sum of the dimensions of the connecting portion 521 and the protruding portion 522 in the second direction Y.

[0196] The number of the protrusions 522 in one adhesive area H may be three, four, five, etc., and may be specifically set according to the size of the adhesive area H in the first direction X and the distance between two adjacent protrusions 522 .

[0197] In addition, the number of protrusions 522 in the two adhesive areas H may be equal, for example, the number of protrusions 522 in the two adhesive areas H is three or five. Alternatively, the number of protrusions 522 in the two adhesive areas H may be unequal, for example, the number of protrusions 522 in one adhesive area H is three, and the number of protrusions 522 in the other adhesive area H is four.

[0198] For example, the distance between any two adjacent protrusions 522 may be equal, or the distance between any two adjacent protrusions 522 may be unequal.

[0199] Exemplarily, the connection portion 521 may be a square structure, such as a rectangle or a square, and since the connection portion 521 has a regular shape, it is convenient to arrange the connection portion 521. Alternatively, the connection portion 521 may also be a parallelogram structure, or an irregular curved structure.

[0200] Based on the structure that the second bonding part 52 includes a connecting part 521 and a plurality of protrusions 522, in some embodiments, the connecting part 521 and the plurality of protrusions 522 are in an integral structure, and the connecting part 521 and the first bonding part 51 are in an integral structure, so that the first bonding part 51 and the second bonding part 52 are in an integral structure. In this way, the connection strength between the first bonding part 51, the connecting part 521 and the plurality of protrusions 522 can be increased, so as to increase the overall structural strength of the first bonding part 51, the connecting part 521 and the plurality of protrusions 522, thereby more stably bonding the flexible display panel 1 to the support layer 4.

[0201] When the protrusions 522 are arranged, the sizes of the plurality of protrusions 522 in the second direction Y may be equal, so that the arrangement of the plurality of protrusions 522 can be facilitated. Alternatively, the sizes of the plurality of protrusions 522 in the second direction Y may be unequal. In the case where the sizes of the plurality of protrusions 522 in the second direction Y are unequal, as Fig.32 As shown, along the first direction X, the lengths of the plurality of protrusions 522 first increase and then decrease. The length of the protrusion 522 is the maximum dimension of the protrusion 522 along the second direction Y.

[0202] As a result, the plurality of protrusions 522 are close to the boundary of the adhesive-free area I and present a parabolic trend. Fig.18 The warped state of the edge of the second display portion 1b in the simulation experiment state shown in the figure matches, and the edge of the second display portion 1b and the supporting layer 4 can be fixed more specifically to better improve the degree of the warped edge of the second display portion 1b.

[0203] In some embodiments, Fig.33 As shown, the connection position of the protrusion 522 and the connection part 521 is chamfered. In this way, when cutting to form the adhesive layer 5, it is easy to cut and discharge the connection between the protrusion 522 and the connection part 521. At the same time, the chamfering structure can also reduce the requirements for the tool and reduce the processing cost.

[0204] The connecting position of the protruding portion 522 and the connecting portion 521 may be chamfered, and the radius of the fillet may be set according to actual needs. Alternatively, the connecting position of the protruding portion 522 and the connecting portion 521 may be chamfered. The inclination of the hypotenuse of the chamfered angle may be 45° or 60°, etc.

[0205] Exemplarily, the connection points between all protrusions 522 and the connection part 521 are set to be chamfered. Alternatively, the connection points between all protrusions 522 and the connection part 521 are set to be chamfered. Alternatively, the connection points between some protrusions 522 in the plurality of protrusions 522 and the connection part 521 are set to be chamfered, and the connection points between another part of the protrusions 522 in the plurality of protrusions 522 and the connection part 521 are set to be chamfered.

[0206] In some embodiments, Fig.34 As shown, the end of the protrusion 522 away from the connection part 521 is rounded. In this way, when cutting to form the adhesive layer 5, it is easy to cut and discharge the end of the protrusion 522 away from the connection part 521. The rounded corner structure can also reduce the requirements for the tool and reduce the processing cost.

[0207] It can be understood that the radius of the fillet should be reasonably set according to the size of the protrusion 522 along the first direction X and requirements.

[0208] Exemplarily, a portion of the protrusions 522 away from one end of the connecting portion 521 is rounded, while another portion of the protrusions 522 away from one end of the connecting portion 521 is not rounded. Alternatively, all the protrusions 522 away from one end of the connecting portion 521 are rounded.

[0209] In actual products, it is necessary not only to provide support for the flexible display panel 1 , but also to provide buffering and protection for the flexible display panel 1 .

[0210] Based on this, in some embodiments, such as Fig.35 As shown, the foldable display module 10 further includes a back film 7 (U-Film) and a buffer layer 8, the back film 7 is disposed between the flexible display panel 1 and the support layer 4, the buffer layer 8 is disposed between the back film 7 and the support layer 4, and the adhesive layer 5 is located between the buffer layer 8 and the support layer 4. In this way, when the foldable display module 10 is impacted, the back film 7 and the buffer layer 8 can play a buffering role, thereby slowing down the force transmitted to the flexible display panel 1, so as to provide protection for the flexible display panel 1.

[0211] The back film 7 can be made of a transparent, flexible material, including but not limited to PET, polyimide (PI), etc. In this way, the back film 7 is bendable, and when the foldable display module 10 is folded, the back film 7 can be folded along with it.

[0212] Exemplarily, the thickness of the back film 7 ranges from 50 μm to 100 μm, for example, the thickness of the back film 7 can be 50 μm, 60 μm, 63 μm, 65 μm, 68 μm, 70 μm, 80 μm or 100 μm. The thickness of the back film 7 within this range is more appropriate, which can provide sufficient support for the flexible display panel 1 on the one hand, and can also prevent the foldable display module 10 from being too thick as a whole, thereby facilitating the thin and light design of the foldable display module 10.

[0213] For example, taking the thickness of the back film 7 as 65 μm, this can not only provide more sufficient support for the flexible display panel 1 , but also be more conducive to the lightweight design of the foldable display module 10 .

[0214] In some examples, the buffer layer 8 may be made of a flexible resin material, including but not limited to polyimide.

[0215] For example, the buffer layer 8 may be made of black polyimide, and the black buffer layer 8 may play a light shielding role to prevent the light emitted by the flexible display panel 1 from leaking from the backlight side of the flexible display panel 1 .

[0216] Exemplarily, the thickness of the buffer layer 8 is in the range of 20 μm to 60 μm. For example, the thickness of the buffer layer 8 may be 20 μm, 30 μm, 40 μm, 50 μm or 60 μm.

[0217] Optionally, the thickness of the buffer layer 8 is in the range of 20 μm to 30 μm, for example, the thickness of the buffer layer 8 may be 20 μm, 23 μm, 25 μm, 27 μm or 30 μm. The thickness of the buffer layer 8 within this range is more appropriate, which can provide sufficient buffering for the flexible display panel 1 on the one hand, and can also prevent the foldable display module 10 from being too thick as a whole, thereby facilitating the thin and light design of the foldable display module 10.

[0218] For example, taking the thickness of the buffer layer 8 as 25 μm, this can not only provide more sufficient buffering for the flexible display panel 1 , but also be more conducive to the lightweight design of the foldable display module 10 .

[0219] In some examples, such as Fig.35 As shown, the foldable display module 10 further includes a fourth fixed sublayer P, which is disposed between the buffer layer 8 and the back film 7. The fourth fixed sublayer P is used to bond the buffer layer 8 and the back film 7 together, thereby achieving a stable connection between the buffer layer 8 and the back film 7.

[0220] Exemplarily, the material of the fourth fixed sublayer P may include pressure-sensitive adhesive, so that the fourth fixed sublayer P can have strong elasticity and is not easy to break, and can still maintain a stable connection between the buffer layer 8 and the back film 7 after the foldable display module 10 is bent multiple times.

[0221] Exemplarily, the thickness of the fourth fixed sublayer P ranges from 15 μm to 25 μm, for example, the thickness of the fourth fixed sublayer P can be 15 μm, 17 μm, 19 μm, 20 μm or 25 μm. The thickness of the fourth fixed sublayer P within this range is more appropriate. On the one hand, the buffer layer 8 and the back film 7 can be stably connected together, and on the other hand, the foldable display module 10 can be prevented from being too thick as a whole, thereby facilitating the thin and light design of the foldable display module 10.

[0222] For example, taking the thickness of the fourth fixed sublayer P as 20 μm, the back film 7 and the buffer layer 8 can be connected together more stably, and it is also more conducive to the lightweight design of the foldable display module 10 .

[0223] In some embodiments, when the film layer is laminated using a roller process, Fig.36 As shown, the back film 7 is first fixed to the backlight side of the flexible display panel 1 ( Fig.36 The upper side of the back film 7 is formed in the middle, and then the support layer 4, the buffer layer 8 and the fourth fixed sublayer P are bonded together and turned over so that the fourth fixed sublayer P faces the back film 7. Finally, the fourth fixed sublayer P is bonded to the back film 7 using a roller process.

[0224] Since the second bonding portion 52 is located between the support layer 4 and the buffer layer 8, the support layer 4 can be located between the buffer layer 8 and the support layer 4. Fig.36 The portion within the F region and the fourth fixed sublayer P are located Fig.36 The portion in the middle F area provides support, so that after flipping the support layer 4, the buffer layer 8 and the fourth fixed sublayer P as a whole, under the gravity G of the buffer layer 8 and the fourth fixed sublayer P as a whole, the deformation degree of the fourth fixed sublayer P is small or no deformation occurs, so that after the fourth fixed sublayer P is bonded to the back film 7, the flatness of the bonding surface between the fourth fixed sublayer P and the back film 7 can be improved, thereby improving the light and shadow irregularities of the flexible display panel 1.

[0225] The fundamental reason for the warping of the edge of the second display part 1b is that the force on the first substrate layer 31 in the protective layer 3 is uneven. Specifically, when the first hardened coating layer 32 is cured, it will generate a cohesive force that causes the edge of the first substrate layer 31 in the protective layer 3 to warp, and finally cause the edge of the entire protective layer 3 to warp. In this way, after the protective layer 3 is bonded to the flexible display panel 1, the edge of the second display part 1b of the flexible display panel 1 will also be in an edge warping state under the upward pulling force of the protective layer 3. Therefore, improving the degree of edge warping of the protective layer 3 is of great significance to improving the edge warping problem of the flexible display panel 1.

[0226] Based on this, in some embodiments, such as Fig.37 As shown, the foldable display module 10 further includes at least one second hardened coating layer 9 disposed between the first substrate layer 31 and the flexible display panel 1 .

[0227] In this way, since the second hardened coating layer 9 and the first hardened coating layer 32 will both generate cohesive force, and since the first hardened coating layer 32 and the second hardened coating layer 9 are respectively located on the two opposite surfaces of the first substrate layer 31, the second hardened coating layer 9 can weaken or offset the force of the first hardened coating layer 32 acting on the first substrate layer 31, so that the protective layer 3 as a whole presents a relatively flat state. In this way, when the protective layer 3 and the second hardened coating layer 9 are arranged on the flexible display panel 1, the upward pulling force on the flexible display panel 1 will be reduced or disappear, and naturally the degree of upward warping of the edge of the flexible display panel 1 will also be reduced, thereby improving the phenomenon of uneven light and shadow of the flexible display panel 1.

[0228] It can be understood that the materials of the first hardening coating layer 32 and the second hardening coating layer 9 can be the same or different.

[0229] Exemplarily, when the foldable display module 10 includes the third fixed sublayer O3 , the third fixed sublayer O3 is disposed between the second hardening coating layer 9 and the flexible display panel 1 .

[0230] The number of the second hardened coating layer 9 can be one layer, two layers, or three layers.

[0231] In some embodiments, Fig.37 As shown, when the number of the second hardened coating layer 9 is one layer, the second hardened coating layer 9 can be directly disposed on the surface of the first base material layer 31 on the side away from the first hardened coating layer 32 .

[0232] In this case, in the actual production process, the material of the first hardened coating layer 32 is firstly coated on the upper surface of the first substrate layer 31 (the side surface of the first substrate layer 31 away from the flexible display panel 1), and then the material of the second hardened coating layer 9 is coated on the lower surface of the first substrate layer 31 (the side surface of the first substrate layer 31 close to the flexible display panel 1). Then, the produced integrated product of the protective layer 3 and the second hardened coating layer 9 is bonded to the light-emitting side of the flexible display panel 1.

[0233] However, since the material forming the first hardened coating layer 32 is coated on the first substrate layer 31 earlier than the material forming the second hardened coating layer 9, the first hardened coating layer 32 will be cured first. Therefore, when the material forming the second hardened coating layer 9 is coated, the cohesive force of the second hardened coating layer 9 may cause the already cured first hardened coating layer 32 to break.

[0234] Based on this, after coating the material to form the first hardened coating layer 32, the energy for curing the first hardened coating layer 32 can be reduced to extend the curing time of the first hardened coating layer 32, so that when the material to form the second hardened coating layer 9 is coated on the lower surface of the first substrate layer 31, the first hardened coating layer 32 has not been completely cured and the upward warping state of the first substrate layer 31 is still relatively small, thereby avoiding the breakage of the first hardened coating layer 32 due to the setting of the second hardened coating layer 9.

[0235] For example, the first hardened coating layer 32 may be cured by heating. In this case, the curing time of the first hardened coating layer 32 may be prolonged by lowering the temperature at which the first hardened coating layer 32 is cured.

[0236] Exemplarily, in this case, the thickness of the first substrate layer 31 ranges from 50 μm to 70 μm, for example, the thickness of the first substrate layer 31 may be 50 μm, 55 μm, 60 μm, 65 μm or 70 μm. The thickness of the first substrate layer 31 within this range is more appropriate, which can provide sufficient protection for the flexible display panel 1 on the one hand, and prevent the foldable display module 10 from being too thick on the other hand, thereby facilitating the thin and light design of the foldable display module 10.

[0237] For example, taking the thickness of the first substrate layer 31 as 65 μm, the first substrate layer 31 of such thickness can not only provide more adequate protection for the flexible display panel 1 , but also is more conducive to the lightweight design of the foldable display module 10 .

[0238] In the case where the second hardened coating layer 9 is provided as one layer and is provided on the lower surface of the first substrate layer 31, the following experimental demonstration is conducted to obtain a more appropriate thickness of the second hardened coating layer 9. The following demonstration is conducted by taking the thickness of the first hardened coating layer 32 as 5 μm and the thickness of the first substrate layer 31 as 65 μm as an example. Please refer to Table 1 for details.

[0239] Table 1

[0240]

[0241] As can be seen from Table 1 above, when the thickness of the second hardened coating layer 9 is 1 μm, the edges of the protective layer 3 and the second hardened coating layer 9 as a whole are still in an upward state. When the thickness of the second hardened coating layer 9 is 2 μm, the edges of the protective layer 3 and the second hardened coating layer 9 as a whole are flat. When the thickness of the second hardened coating layer 9 is 3 μm, the edges of the protective layer 3 and the second hardened coating layer 9 as a whole are slightly downwardly warped. When the thickness of the second hardened coating layer 9 is greater than or equal to 4 μm and less than or equal to 5 μm, the edges of the protective layer 3 and the second hardened coating layer 9 as a whole are downwardly warped.

[0242] It can be seen from the above data that when the thickness of the second hardened coating layer 9 is 2μm, the protective layer 3 and the second hardened coating layer 9 can be made flat as a whole. After the protective layer 3 and the second hardened coating layer 9 are integrally bonded to the flexible display panel 1, the edge warping of the flexible display panel 1 can be improved to the greatest extent, and the light and shadow irregularities of the flexible display panel 1 can be better improved.

[0243] It should be explained that the experimental data in Table 1 above are related to the material of the first substrate layer 31 and the state and manufacturing process of the first hardened coating layer 32 , so the control variable method needs to be used for verification during the experiment.

[0244] Based on the above experimental data, the thickness of the second hardened coating layer 9 is less than the thickness of the first hardened coating layer 32. In this way, the force of the first hardened coating layer 32 acting on the first substrate layer 31 can be balanced, and the overall thinness of the foldable display module 10 can be ensured. And because the second hardened coating layer 9 is disposed between the flexible display panel 1 and the first substrate layer 31, rather than being located on the surface of the foldable display module 10, it is not necessary to use the second hardened coating layer 9 to increase the structural strength of the surface of the flexible display panel 1. Therefore, even if the thickness of the second hardened coating layer 9 is less than the thickness of the first hardened coating layer 32, it will not affect the surface structural strength of the foldable display module 10.

[0245] In other embodiments, Fig.38As shown, when the number of the second hardened coating layer 9 is one layer, the foldable display module 10 further includes a second substrate layer 301 disposed between the first substrate layer 31 and the second hardened coating layer 9. By disposing the second substrate layer 301, two substrate layers (the first substrate layer 31 and the second substrate layer 301) are provided between the first hardened coating layer 32 and the second hardened coating layer 9, so that the overall structural strength of the foldable display module 10 can be increased, and the reliability of the foldable display module 10 can be improved.

[0246] In this case, in the process of setting the second hardened coating layer 9, the second substrate layer 301 can be processed first, and then the material of the second hardened coating layer 9 can be coated on the second substrate layer 301. After the second hardened coating layer 9 is cured, the second substrate layer 301 is turned over to bond the second substrate layer 301 to the first substrate layer 31. In this way, the second hardened coating layer 9 is set. Since the processing technology of setting the second hardened coating layer 9 on the second substrate layer 301 is similar to the processing technology of setting the first hardened coating layer 32 on the first substrate layer 31, the difficulty of setting the second hardened coating layer 9 can be reduced.

[0247] For example, when the surface of the foldable display module 10 is subjected to a pen drop test or a ball drop test, the second substrate layer 301 and the second hardened coating layer 9 can increase the structural strength of the surface of the foldable display module 10 and prevent the surface of the flexible display panel 1 in the foldable display module 10 from being broken.

[0248] In some examples, such as Fig.38 As shown, the foldable display module 10 further includes a fifth fixed sublayer O4, which is disposed between the first substrate layer 31 and the second substrate layer 301 to bond the first substrate layer 31 and the second substrate layer 301 together.

[0249] Exemplarily, the material of the fifth fixed sublayer O4 may include optical glue, wherein the thickness of the fifth fixed sublayer O4 may be set according to actual conditions.

[0250] In some examples, the film layers included in the second substrate layer 301 may be the same as the film layers included in the first substrate layer 31 (eg, the transparent cover plate 312 , the first sub-film 311 , and the second sub-film 313 ).

[0251] For example, when the first substrate layer 31 includes the first sub-film 311 , the transparent cover plate 312 , and the second sub-film 313 , the second substrate layer 301 also includes the first sub-film 311 , the transparent cover plate 312 , and the second sub-film 313 .

[0252] For example, when the first substrate layer 31 includes the first sub-film 311 and the transparent cover plate 312 , the second substrate layer 301 also includes the first sub-film 311 and the transparent cover plate 312 .

[0253] For another example, when the first substrate layer 31 includes the transparent cover plate 312 and the second sub-film 313 , the second substrate layer 301 also includes the transparent cover plate 312 and the second sub-film 313 .

[0254] For another example, when the first substrate layer 31 includes the transparent cover plate 312 , the second substrate layer 301 also includes the transparent cover plate 312 .

[0255] In some other examples, the film layer included in the second substrate layer 301 may be different from the film layer included in the first substrate layer 31 .

[0256] For example, in the case where the first base material layer 31 includes the first sub-film 311 , the transparent cover plate 312 , and the second sub-film 313 .

[0257] The second substrate layer 301 includes a first sub-film 311 and a second sub-film 313. Alternatively, the second substrate layer 301 includes the first sub-film 311. Alternatively, the second substrate layer 301 includes the second sub-film 313.

[0258] For another example, the first substrate layer 31 includes the first sub-film 311 and the transparent cover plate 312 .

[0259] The second substrate layer 301 includes a first sub-film 311, a transparent cover plate 312, and a second sub-film 313. Alternatively, the second substrate layer 301 includes the first sub-film 311 and the second sub-film 313. Alternatively, the second substrate layer 301 includes the second sub-film 313 and a transparent cover plate 312. Alternatively, the second substrate layer 301 includes the transparent cover plate 312. Alternatively, the second substrate layer 301 includes the first sub-film 311. Alternatively, the second substrate layer 301 includes the second sub-film 313.

[0260] For another example, the first substrate layer 31 includes a transparent cover plate 312 and a second sub-film 313 .

[0261] The second substrate layer 301 includes a first sub-film 311, a transparent cover plate 312, and a second sub-film 313. Alternatively, the second substrate layer 301 includes the first sub-film 311 and the second sub-film 313. Alternatively, the second substrate layer 301 includes the second sub-film 313. Alternatively, the second substrate layer 301 includes the transparent cover plate 312. Alternatively, the second substrate layer 301 includes the first sub-film 311.

[0262] For another example, the first substrate layer 31 includes a transparent cover plate 312 .

[0263] The second substrate layer 301 includes a first sub-film 311, a transparent cover plate 312, and a second sub-film 313. Alternatively, the second substrate layer 301 includes the first sub-film 311 and the second sub-film 313. Alternatively, the second substrate layer 301 includes the second sub-film 313. Alternatively, the second substrate layer 301 includes the first sub-film 311.

[0264] Exemplarily, the thickness of the second substrate layer 301 ranges from 20 μm to 60 μm, for example, the thickness of the second substrate layer 301 may be 20 μm, 25 μm, 30 μm, 40 μm, 50 μm or 60 μm. The thickness of the second substrate layer 301 within this range is more appropriate, which can not only meet the setting of the second hardened coating layer 9, but also prevent the overall thickness of the foldable display module 10 from being too thick, so as to facilitate the lightweight design of the foldable display module 10.

[0265] In this case, please refer to Table 2 below and conduct two experiments to obtain a more appropriate thickness of the second hardened coating layer 9 .

[0266] The first one is to take the case where the thickness of the first hardened coating layer 32 is 5 μm, the thickness of the first substrate layer 31 is 65 μm, and the thickness of the second substrate layer is 25 μm as an example for experimental demonstration.

[0267] The second method is to take the case where the thickness of the first hardened coating layer 32 is 5 μm, the thickness of the first substrate layer 31 is 65 μm, and the thickness of the second substrate layer is 50 μm as an example for experimental demonstration.

[0268] Table 2

[0269]

[0270] As can be seen from Table 2 above, in the first case, when the thickness of the second hardened coating layer 9 is 1 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are still in an upward state. When the thickness of the second hardened coating layer 9 is 2 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are slightly upward. When the thickness of the second hardened coating layer 9 is 3 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are flat. When the thickness of the second hardened coating layer 9 is 4 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are slightly downward. When the thickness of the second hardened coating layer 9 is 5 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are slightly downward.

[0271] It can be seen from the above data that when the thickness of the second hardened coating layer 9 is 3μm, the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 can be made flat as a whole. After the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 are integrally bonded to the flexible display panel 1, the protective layer 3, the second hardened coating layer 9, the second substrate layer 301 and the flexible display panel 1 can be made flat as a whole, so as to better improve the edge warping of the flexible display panel 1 and better improve the light and shadow irregularity of the flexible display panel 1.

[0272] As can be seen from Table 2 above, in the second case, when the thickness of the second hardened coating layer 9 is 1 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are still in an upward state. When the thickness of the second hardened coating layer 9 is 2 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are in a flat state. When the thickness of the second hardened coating layer 9 is 3 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are in a flat state. When the thickness of the second hardened coating layer 9 is 4 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are in a slightly downward state. When the thickness of the second hardened coating layer 9 is 5 μm, the edges of the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 as a whole are in a slightly downward state.

[0273] It can be seen from the above data that when the thickness of the second hardened coating layer 9 is between 2μm and 3μm, the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 can be made flat as a whole. After the protective layer 3, the second hardened coating layer 9 and the second substrate layer 301 are bonded to the flexible display panel 1 as a whole, the protective layer 3, the second hardened coating layer 9, the second substrate layer 301 and the flexible display panel 1 as a whole can be made flat, thereby better improving the edge warping of the flexible display panel 1 and better improving the uneven light and shadow phenomenon of the flexible display panel 1.

[0274] It should be explained that the experimental data in Table 2 above are related to the material of the first substrate layer 31, the material of the second substrate layer 301, and the state and manufacturing process of the first hardened coating layer 32, so the control variable method needs to be used for verification during the experiment.

[0275] Based on the experimental data in Table 2 above, the thickness of the second hardened coating layer 9 is less than the thickness of the first hardened coating layer 32. In this way, the force of the first hardened coating layer 32 acting on the first substrate layer 31 can be balanced, and the overall thinness of the foldable display module 10 can be ensured. And because the second hardened coating layer 9 is disposed between the flexible display panel 1 and the first substrate layer 31, rather than being located on the surface of the foldable display module 10, it is not necessary to use the second hardened coating layer 9 to increase the structural strength of the surface of the flexible display panel 1. Therefore, even if the thickness of the second hardened coating layer 9 is less than the thickness of the first hardened coating layer 32, it will not affect the surface structural strength of the foldable display module 10.

[0276] In addition, based on the experimental data in Table 2 above, the thickness of the second substrate layer 301 is less than the thickness of the first substrate layer 31. Since the second substrate layer 301 is disposed between the flexible display panel 1 and the first substrate layer 31, the first substrate layer 31 is mainly used to protect the flexible display panel 1. Therefore, the thickness of the second substrate layer 301 can be less than the thickness of the first substrate layer 31, which can facilitate the arrangement of the second hardened coating layer 9 and facilitate the overall thin and light design of the foldable display module 10.

[0277] In some embodiments, Fig.39 As shown, when the number of the second hardened coating layers 9 is multiple layers, the foldable display module 10 further includes a third substrate layer 302 disposed between two adjacent layers of the second hardened coating layers 9. By providing multiple layers of the second hardened coating layers 9 and multiple layers of the third substrate layer 302, the force of the first hardened coating layer 32 acting on the first substrate layer 31 is balanced, so that the flexible display panel 1 is in a relatively flat state as a whole, so as to improve the light and shadow irregularity of the flexible display panel 1.

[0278] In some examples, such as Fig.39 As shown, there are two second hardened coating layers 9, and the two second hardened coating layers 9 are respectively a second hardened coating sublayer 9A and a second hardened coating sublayer 9B, wherein the first hardened coating sublayer 9A is located above the second hardened coating sublayer 9B.

[0279] In some examples, the film layer included in the third substrate layer 302 may be the same as the film layer included in the first substrate layer 31 (for example, the transparent cover plate 312, the first sub-film 311). For details, please refer to the above description of the first substrate layer 31 and the second substrate layer 301. The following only gives examples of some cases without further elaboration.

[0280] For example, when the first substrate layer 31 includes the first sub-film 311 , the transparent cover plate 312 , and the second sub-film 313 , the third substrate layer 302 also includes the first sub-film 311 , the transparent cover plate 312 , and the second sub-film 313 .

[0281] For another example, when the first substrate layer 31 includes the transparent cover plate 312 and the second sub-film 313 , the third substrate layer 302 also includes the transparent cover plate 312 and the second sub-film 313 .

[0282] In some other examples, the film layer included in the third substrate layer 302 and the film layer included in the first substrate layer 31 may also be different.

[0283] For example, in the case where the first base material layer 31 includes the first sub-film 311 , the transparent cover plate 312 , and the second sub-film 313 .

[0284] The third substrate layer 302 includes a first sub-film 311 and a second sub-film 313. Alternatively, the third substrate layer 302 includes the first sub-film 311. Alternatively, the third substrate layer 302 includes the second sub-film 313.

[0285] For another example, the first substrate layer 31 includes the first sub-film 311 and the transparent cover plate 312 .

[0286] The third substrate layer 302 includes a first sub-film 311, a transparent cover plate 312, and a second sub-film 313. Alternatively, the third substrate layer 302 includes the first sub-film 311 and the second sub-film 313. Alternatively, the third substrate layer 302 includes the second sub-film 313 and a transparent cover plate 312. Alternatively, the third substrate layer 302 includes the transparent cover plate 312. Alternatively, the third substrate layer 302 includes the first sub-film 311. Alternatively, the third substrate layer 302 includes the second sub-film 313.

[0287] In some embodiments, the thickness of the third substrate layer 302 is less than the thickness of the first substrate layer 31. Since the third substrate layer 302 is disposed between the flexible display panel 1 and the first substrate layer 31, the first substrate layer 31 is mainly used to protect the flexible display panel 1, so the thickness of the third substrate layer 302 can be less than the thickness of the first substrate layer 31, which can facilitate the arrangement of the second hardened coating layer 9 and facilitate the lightweight design of the foldable display module 10.

[0288] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that a person skilled in the art can think of within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A foldable display module, characterized in that: include: Support layer; an adhesive layer located on the support layer; A flexible display panel located on the adhesive layer, the flexible display panel comprising a plurality of first display portions and at least one second display portion, the plurality of first display portions are sequentially arranged along a first direction, the second display portion is located between two adjacent first display portions, the second display portion is bendable, and the bending axis is along a second direction; the second display portion has a non-glue area and glue areas located on opposite sides of the non-glue area along the second direction; the first direction is perpendicular to the second direction; a protective layer located on the flexible display panel; Wherein, the adhesive layer includes a plurality of first adhesive portions and a plurality of second adhesive portions, the first adhesive portions are arranged between the first display portion and the supporting layer, and the adhesive area is provided with at least one second adhesive portion.

2. The foldable display module according to claim 1, characterized in that: The second adhesive portion is in a strip shape; along the first direction, the second adhesive portion is connected to two first adhesive portions located on two opposite sides thereof.

3. The foldable display module according to claim 2, characterized in that: A side boundary of the second adhesive portion close to the adhesive-free area is in a curved shape, and the boundary protrudes toward the direction close to the adhesive-free area.

4. The foldable display module according to claim 2, characterized in that: The connection position between the second bonding portion and the first bonding portion is chamfered.

5. The foldable display module according to claim 1, characterized in that: The second bonding portion comprises: A connecting portion, along the first direction, the connecting portion is connected to two first bonding portions located on opposite sides thereof; A plurality of protrusions connected to the connection portion are arranged on a side of the connection portion close to the glue-free area, and the plurality of protrusions are arranged at intervals along the first direction.

6. The foldable display module according to claim 5, characterized in that: Along the first direction, the lengths of the plurality of protrusions first increase and then decrease; the length of the protrusion is the maximum dimension of the protrusion along the second direction.

7. The foldable display module according to claim 5, characterized in that: The connection position between the protruding portion and the connecting portion is chamfered.

8. The foldable display module according to claim 5, characterized in that: The protrusion is located away from one end of the connection portion and is rounded.

9. The foldable display module according to claim 1, characterized in that: Along the second direction, the maximum size of the second bonding portion is in the range of 5 mm to 10 mm.

10. The foldable display module according to claim 1, characterized in that: The glue-free area has a center line along the first direction; The second bonding portions in the two adhesive areas are symmetrically arranged about the center line.

11. The foldable display module according to claim 1, characterized in that: The support layer is provided with a plurality of through holes, and the orthographic projections of the plurality of through holes on the second display portion are located in the glue-free area.

12. The foldable display module according to claim 2, characterized in that: The first bonding portion and the second bonding portion are in an integrated structure.

13. The foldable display module according to any one of claims 1 to 12, characterized in that: The protective layer comprises: a first substrate layer located on the flexible display panel; A first hardened coating layer, disposed on a side of the first substrate layer away from the flexible display panel; The foldable display module further includes: at least one second hardened coating layer disposed between the first substrate layer and the flexible display panel.

14. The foldable display module according to claim 13, characterized in that: When the number of the second hardened coating layer is one layer, the foldable display module further includes a second substrate layer disposed between the first substrate layer and the second hardened coating layer.

15. The foldable display module according to claim 14, characterized in that: The thickness of the second substrate layer is smaller than the thickness of the first substrate layer.

16. The foldable display module according to claim 13, characterized in that: In the case where the number of the second hardened coating layers is multiple layers, the foldable display module further includes: a third substrate layer arranged between two adjacent layers of the second hardened coating layers.

17. The foldable display module according to claim 13, characterized in that: The thickness of the second hardened coating layer is smaller than the thickness of the first hardened coating layer.

18. A foldable display device, characterized in that: include: A foldable display module, which is the foldable display module according to any one of claims 1 to 17; The middle frame is arranged on the non-light-emitting side of the foldable display module.

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