Flexible display device, wearable device, and method of manufacturing flexible display device

Abstract

The present disclosure provides a flexible display device, a wearable device and a flexible display device manufacturing method. The flexible display device comprises a flexible display panel, a sealing structure and a transition layer. The flexible display panel has a display area and a peripheral area, the peripheral area is arranged around the display area, and the peripheral area is provided with a fan-out area away from one side of the display area along a first direction. The sealing structure covers the edge of the flexible display panel. The transition layer covers the outside of the fan-out area, and is arranged between the fan-out area and the sealing structure. The sealing structure is arranged around the flexible display panel to seal the peripheral side of the flexible display panel, thereby achieving waterproof and oil-proof effects. The transition layer plays a role of intermediate transition and gradual change between the fan-out area and the sealing structure, and to some extent, also realizes the isolation between the fan-out area and the sealing structure, avoids direct contact between the fan-out area and the sealing structure, and reduces the failure of the flexible display panel in the bending process.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more specifically, to flexible display devices, wearable devices, and methods for manufacturing flexible display devices. Background Technology

[0002] Wearable devices have NFC, eSIM, blood oxygen detection, and heart rate detection functions. Among them, NFC is located between the display and the circuit board and is not affected by metal materials.

[0003] If wearable devices need to be constantly bent and unfolded during use, it is impossible to balance waterproof sealing and bending performance.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a flexible display device, wearable device, and a method for manufacturing a flexible display device, which takes into account both waterproof sealing and bending performance.

[0006] To achieve the above-mentioned objectives, the present disclosure adopts the following technical solution:

[0007] According to one aspect of this disclosure, a flexible display device is provided, comprising:

[0008] A flexible display panel having a display area and a peripheral area, the peripheral area being arranged around the display area, and a fan-out area being provided on the side of the peripheral area along a first direction away from the display area;

[0009] A sealed structure covers the edge of the flexible display panel;

[0010] A transition layer covers the outside of the fan-out area and is disposed between the fan-out area and the sealing structure.

[0011] In one exemplary embodiment of this disclosure, the modulus of the transition layer is less than the modulus of the sealing structure corresponding to the fan-out region portion; and / or,

[0012] The thickness of the transition layer is less than the thickness of the portion of the sealing structure corresponding to the fan-out area.

[0013] In one exemplary embodiment of this disclosure, the modulus of the transition layer is 0.5 MPa to 3 MPa, and the modulus of the sealing structure corresponding to the fan-out region is 3 MPa to 10 MPa; and / or,

[0014] The thickness of the transition layer is 0.05mm to 0.3mm, and the sum of the thickness of the sealing structure corresponding to the fan-out area and the thickness of the transition layer is 0.3mm to 0.5mm.

[0015] In one exemplary embodiment of this disclosure, the number of transition layers is plurality of layers, and the modulus of the plurality of transition layers gradually increases along the first direction and from the fan-out region to the sealing structure; and / or,

[0016] The number of transition layers is multiple, and the thickness of the multiple transition layers gradually increases along the first direction and from the fan-out area to the sealing structure.

[0017] In one exemplary embodiment of this disclosure, the transition layer comprises a polyacrylate thermoplastic material.

[0018] In one exemplary embodiment of this disclosure, the flexible display device further includes:

[0019] A protective layer covers the outside of the fan-out area, and the protective layer is disposed between the fan-out area and the transition layer.

[0020] In an exemplary embodiment of this disclosure, the flexible display panel has an end region on the side along the first direction and away from the fan-out area, and the display area includes a bent area and a non-bent area, the bent area and the non-bent area being arranged along the first direction;

[0021] An adjustment gap is provided between the end area and the sealing structure.

[0022] In one exemplary embodiment of this disclosure, the adjustment gap and the length of the bending zone are positively correlated, the adjustment gap and the bending angle of the bending zone are positively correlated, and the adjustment gap and the bending radius of the bending zone are negatively correlated.

[0023] In one exemplary embodiment of this disclosure, the sealing structure is provided with a groove on the side facing the end region.

[0024] In one exemplary embodiment of this disclosure, the display area includes a bent area and a non-bent area, the bent area and the non-bent area being arranged along a first direction;

[0025] The sealing structure includes:

[0026] A first sealing portion is disposed on at least one side of the display area along the second direction, the first sealing portion and the bending area are correspondingly disposed, and the second direction is perpendicular to the first direction;

[0027] The second sealing part is disposed on at least one side of the display area along the second direction, and the second sealing part and the non-bending area are disposed correspondingly;

[0028] Wherein, the modulus of the first sealing part is less than the modulus of the second sealing part; and / or, the thickness of the first sealing part is less than the thickness of the second sealing part.

[0029] In one exemplary embodiment of this disclosure, the modulus of the first sealing portion is 0–3 MPa, and the modulus of the second sealing portion is 3 MPa–20 MPa; and / or,

[0030] The thickness of the first sealing part is 0.05mm to 0.1mm, and the thickness of the second sealing part is 0.1mm to 0.2mm.

[0031] In one exemplary embodiment of this disclosure, the tensile strength of the first sealing part is ≥12 MPa, the elongation at break of the first sealing part is ≥110%, and the surface adhesion of the first sealing part is ≥5 MPa.

[0032] In one exemplary embodiment of this disclosure, the sealing structure includes an organopolysiloxane polymer material, a silica filler, a silane adhesion promoter, and a catalyst; or,

[0033] The sealing structure includes at least one of epoxy resin, polyurethane, acrylic, and ethylene-vinyl acetate copolymer.

[0034] In an exemplary embodiment of this disclosure, the fan-out area includes a bent portion and a connecting portion. One end of the bent portion is connected to the display area, and the other end is connected to the connecting portion. The bent portion and the connecting portion are arranged along a third direction, and the third direction, the first direction, and the second direction are perpendicular to each other.

[0035] The flexible display device further includes a support layer, which is disposed between the display area and the connecting portion;

[0036] A movable cavity is formed between the support layer and the fan-out area on their adjacent sides.

[0037] In one exemplary embodiment of this disclosure, the flexible display panel further includes:

[0038] A cover layer is disposed on the side of the display area along a third direction and away from the connecting portion;

[0039] Wherein, the cover layer is located outside the orthographic projection of the sealing structure relative to the display area, and the cover layer is located outside the orthographic projection of the transition layer relative to the display area.

[0040] According to another aspect of this disclosure, a wearable device is provided, including the aforementioned flexible display device.

[0041] According to another aspect of this disclosure, a method for manufacturing a flexible display device is provided, the method comprising the following steps:

[0042] The fan-out area of ​​the flexible display panel is bent to the backlight side of the display area;

[0043] The transition layer covers the outside of the fan-out region;

[0044] The sealing structure is wrapped around the edges of the flexible display panel and the outside of the transition layer.

[0045] The flexible display device, wearable device, and manufacturing method of the display device disclosed herein include a sealing structure surrounding the flexible display panel to seal its periphery, providing waterproofing and oil resistance. A transition layer serves as an intermediate transition and gradual change between the fan-out area and the sealing structure, and also, to a certain extent, isolates the fan-out area from the sealing structure, preventing direct contact and reducing the likelihood of failure during bending of the flexible display panel.

[0046] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0047] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0048] Figure 1 Schematic diagram of the structure of existing wearable devices Figure 1 ;

[0049] Figure 2 Schematic diagram of the structure of existing wearable devices Figure 2 ;

[0050] Figure 3 Schematic diagram of the structure of existing wearable devices Figure 3 ;

[0051] Figure 4 Schematic diagram of the structure of existing wearable devices Figure 4 ;

[0052] Figure 5 Schematic diagram of the structure of existing wearable devices Figure 5 ;

[0053] Figure 6 Schematic diagram of the structure of existing wearable devices Figure 6 ;

[0054] Figure 7 This is a schematic diagram of the flexible display panel in the flexible display device according to Embodiment 1 of the present invention;

[0055] Figure 8 This is a schematic diagram of the flexible display device according to Embodiment 1 of the present invention;

[0056] Figure 9 This is a cross-sectional view of the flexible display device according to Embodiment 1 of the present invention;

[0057] Figure 10 This is a cross-sectional view of the flexible display device of Embodiment 1 of the present invention in the fan-out region. Figure 1 ;

[0058] Figure 11 for Figure 9 A magnified view of a portion at point A;

[0059] Figure 12 This is a cross-sectional view of the fan-out region of another form of flexible display device according to Embodiment 1 of the present invention;

[0060] Figure 13 This is a cross-sectional view of the end region of another form of flexible display device according to Embodiment 1 of the present invention;

[0061] Figure 14 This is a cross-sectional view of the fan-out region of another form of the flexible display device according to Embodiment 1 of the present invention;

[0062] Figure 15 This is a schematic diagram of the wearable device of Embodiment 1 of the present invention in a non-bent state;

[0063] Figure 16 This is a schematic diagram of the wearable device in a bent state according to Embodiment 1 of the present invention;

[0064] Figure 17 This is a schematic diagram of the flexible display device according to Embodiment 1 of the present invention during adhesive dispensing.

[0065] 101. Waterproof resin; 102. Middle frame; 105. Cover plate; 106. Display panel; 201. Chain link; 202. Resistance mechanism; 203. Slide groove;

[0066] 100. Wearable devices; 200. Material cylinder;

[0067] 1. Flexible display panel; 11. Display area; 111. Bending area; 112. Non-bending area; 12. Peripheral area; 13. Fan-out area; 131. Bending part; 132. Connecting part; 14. End area;

[0068] 2. Sealing structure; 21. First sealing part; 22. Second sealing part;

[0069] 3. Transition layer;

[0070] 4. Protective layer;

[0071] 5. Adjust the gap;

[0072] 6. Support layer; 61. First sub-support layer; 62. Second sub-support layer; 63. Gasket layer;

[0073] 7. Cover layer; 71. Cover plate; 72. Polarizing film;

[0074] 8. SCF layer;

[0075] 9. Decorative layer;

[0076] 10. Movable cavity. Detailed Implementation

[0077] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0078] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0079] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0080] like Figures 1-2 As shown, the cover plate 105 of the existing wearable device is larger than the display panel 106. A ring of waterproof resin 101 is added to the edge of the cover plate 105 extending beyond the display panel 106. One side of the waterproof resin 101 is fixed to the cover plate 105, and the other side is fixed to the middle frame 102. The display panel 106 is encased inside the middle frame 102, forming a sealed and waterproof structure. Existing wearable devices have gradually expanded to flexible products. Wearable devices have added hinge structures, which correspond to the bending area of ​​the display panel, meeting the needs of bending and unfolding. Specifically, as... Figures 3-6 As shown, the hinge structure includes a link 201, which comprises a first link, a second link, and a third link spaced apart. The second and third links can bend along the slide groove 203. The resistance mechanism 202 consists of a disc spring, which acts as an external torque zone to provide resistance to bending and prevent the display panel from bending too quickly and being damaged.

[0081] This embodiment provides a flexible display device, such as... Figures 7-8 As shown, the flexible display device includes a flexible display panel 1 and a sealing structure 2. The flexible display panel 1 has a display area 11 and a peripheral area 12. The peripheral area 12 is arranged around the display area 11. The peripheral area 12 has a fan-out area 13 along the first direction D1 and on the side away from the display area 11 (the first direction is identified by D1, which specifically refers to the length direction of the flexible display panel 1).

[0082] The flexible display panel 1 adopts Pad Bending technology. After the test of the flexible display panel 1 is completed, the display substrate of the flexible display panel 1 can be cut into an irregular shape by laser cutting process to remove the test area of ​​the display substrate and bend the fan-out area 13 to the back of the display substrate, that is, the fan-out area 13 bends towards the back light layer of the display area 11 to achieve the purpose of reducing the bezel width.

[0083] It should be noted that when the fan-out area 13 is bent, the display substrate with signal lines and other structures is also bent, meaning that each structure in the fan-out area 13 will also be bent to the back side of the display substrate.

[0084] like Figures 8-9As shown, the sealing structure 2 covers the edge of the flexible display panel 1, that is, the sealing structure 2 is arranged around the flexible display panel 1 to seal the periphery of the flexible display panel 1, so as to play the role of waterproofing and oil prevention.

[0085] The display area 11 includes a bending area 111 and a non-bending area 112, which are arranged along a first direction D1. Specifically, the bending area 111 has multiple hinges that are interconnected, and the bending direction of the hinges in the bending area 111 is the first direction D1. During use, the flexible display panel 1 needs to be repeatedly bent. Since the flexible display panel 1 is relatively soft, but the sealing structure 2 is relatively rigid, when the flexible display panel 1 is bent and shifts, the softer flexible display panel 1 cannot easily move the rigid sealing structure 2. The sealing structure 2 provides resistance to the flexible display panel 1, leading to breakage of the flexible display panel 1.

[0086] Therefore, such as Figures 9-10 As shown, the flexible display device also includes a transition layer 3, which covers the outside of the fan-out area 13 and is disposed between the fan-out area 13 and the sealing structure 2.

[0087] The transition layer 3 serves as an intermediate transition and gradual change between the fan-out area 13 and the sealing structure 2. In addition, the transition layer 3 also isolates the fan-out area 13 and the sealing structure 2 to a certain extent, avoiding direct contact between the fan-out area 13 and the sealing structure 2, and reducing the possibility of failure of the flexible display panel 1 during bending.

[0088] It should be noted that if the display area 11 does not have a bending area 111, that is, the display area 11 is a rigid structure and does not have a bending function, the transition layer 3 can also play the role of intermediate transition and gradual change between the fan-out area 13 and the sealing structure 2, which facilitates the connection and fixation between the fan-out area 13 and the sealing structure 2 of the flexible display panel 1.

[0089] The transition layer 3 comprises a thermoplastic polyacrylate material, which ensures a strong bond and prevents peeling, enhancing the fixation between the transition layer 3 and the fan-out area 13. It is also flexible and elastic at room temperature, making it compatible with the relatively soft flexible display panel 1. Furthermore, this material possesses a certain degree of water resistance, further improving the sealing effect of the flexible display panel 1.

[0090] In one embodiment, the modulus of the transition layer 3 is less than the modulus of the portion of the fan-out region 13 corresponding to the sealing structure 2.

[0091] Specifically, modulus refers to the ratio of stress to strain of a material under stress. The modulus of transition layer 3 is relatively small, allowing for greater deformation. The modulus of the sealing structure 2 corresponding to the fan-out area 13 is relatively large, resulting in smaller deformation. When the flexible display panel 1 is bent and shifts, the transition layer 3 can undergo significant elastic deformation, allowing the flexible display panel 1 to directly drive the transition layer 3. The transition layer 3, to a certain extent, acts as a follower, reducing the risk of failure due to breakage of the flexible display panel 1.

[0092] For example, the modulus of the transition layer 3 is 0.5 MPa to 3 MPa, such as 0.5 MPa, 1 MPa, 1.5 MPa, 2 MPa and 3 MPa, etc., and the modulus of the sealing structure 2 corresponding to the fan-out region 13 is 3 MPa to 10 MPa, such as 3 MPa, 4 MPa, 7.5 MPa, 8 MPa and 10 MPa, etc.

[0093] In one embodiment, the thickness of the transition layer 3 is less than the thickness of the portion of the sealing structure 2 corresponding to the fan-out region 13. By using a thinner transition layer 3, it is easier to move with the movement of the flexible display panel 1, thereby improving the follow-up effect of the transition layer 3 relative to the fan-out region 13.

[0094] For example, the thickness of the transition layer 3 is 0.05mm to 0.3mm, such as 0.05mm, 0.18mm, 0.2mm, 0.25mm and 0.3mm. The sum of the thickness of the sealing structure 2 corresponding to the fan-out area 13 and the thickness of the transition layer 3 is 0.3mm to 0.5mm, such as 0.3mm, 0.35mm, 0.4mm, 0.42mm and 0.5mm.

[0095] In one embodiment, there are multiple transition layers 3, and the modulus of the multiple transition layers 3 gradually increases along the first direction D1 and from the fan-out region 13 to the sealing structure 2; and / or, there are multiple transition layers 3, and the thickness of the multiple transition layers 3 gradually increases along the first direction D1 and from the fan-out region 13 to the sealing structure 2.

[0096] Multiple transition layers 3 are stacked sequentially between the fan-out area 13 and the sealing structure 2. The multiple transition layers 3 play a role in gradual transition, increasing the flexible connection between the fan-out area 13 and the sealing structure 2, and further reducing the risk of breakage failure of the flexible display panel 1.

[0097] Therefore, by selecting the material, modulus, thickness and quantity of the transition layer 3, when the display area 11 of the flexible display panel 1 has a bending radius of about 5mm to 10mm and a bending angle of 60° to 90°, the flexible display panel 1 is subjected to a room temperature dynamic reliability test. Since the flexible display panel 1 has a transition layer 3, the transition layer 3 can absorb the misalignment caused by bending, thereby reducing display defects such as bright and dark lines.

[0098] Because the fan-out area 13 bends towards the backlight side of the display area 11, the fan-out area 13 is prone to breakage during the bending process or has relatively low structural strength after bending. Therefore, such as Figures 10-11 As shown, the flexible display device also includes a protective layer 4, which covers the outside of the fan-out area 13 and is disposed between the fan-out area 13 and the transition layer 3. The protective layer 4 is disposed corresponding to the fan-out area 13 and wraps around the outside of the fan-out area 13, thereby protecting the fan-out area 13, preventing damage to the fan-out area 13 from the relatively hard sealing structure 2, and extending the service life of the fan-out area 13.

[0099] Since the display area 11 of the flexible display panel 1 has a bending area 111 and a non-bending area 112, the flexible display panel 1 needs to be bent and unfolded continuously during use. During repeated bending, the flexible display panel 1 will shift its position, making it impossible for the flexible display panel 1 to simultaneously achieve both bending performance and waterproof performance.

[0100] Therefore, such as Figure 9 and Figure 11 As shown, the flexible display panel 1 has an end region 14 on the side along the first direction D1 and away from the fan-out area 13, and an adjustment gap 5 is provided between the end region 14 and the sealing structure 2.

[0101] The adjustment gap 5, also known as the misalignment amount, means that the end area 14 and the sealing structure 2 are not completely fitted together, but there is a certain gap. The adjustment gap 5 is essentially a pre-reserved gap at the tail end of the flexible display panel 1, so that the flexible display panel 1 has a certain misalignment space during the bending process, reducing interference during the bending process and improving the reliability of the flexible display panel 1 in bending.

[0102] In one embodiment, the length of the adjustment gap 5 and the bending area 111 are positively correlated, the bending angle of the adjustment gap 5 and the bending radius of the bending area 111 are positively correlated, and the bending radius of the adjustment gap 5 and the bending area 111 are negatively correlated.

[0103] Based on the length, bending angle, and bending radius of the bending zone 111, a suitable adjustment gap 5 is selected to ensure that the flexible display panel 1 has a certain amount of room for movement during the bending process.

[0104] For example, the bending angle of the bending area 111 is 60° to 90°, such as 60°, 65°, 70°, 80° and 90°, etc. When the bending radius of the bending area 111 is about 5mm to 10mm, the adjustment gap 5 is 0.3mm to 0.5mm, such as 0.3mm, 0.35mm, 0.4mm, 0.45mm and 0.5mm.

[0105] In some other embodiments, the sealing structure 2 is provided with a groove (not shown) on the side facing the end region 14.

[0106] During the bending process of the flexible display panel 1, the end area 14 of the flexible display panel 1 can extend into the groove. The groove provides a certain amount of space for the flexible display panel 1 to move, thereby improving the reliability of the flexible display panel 1 during bending. Specifically, along the first direction D1, the depth of the groove can be greater than or equal to the adjustment gap 5.

[0107] Therefore, for at least one end of the flexible display panel 1 along the first direction D1, the transition layer 3 and the adjustment gap 5 are respectively provided corresponding to the fan-out area 13 and the end, so as to adjust the position where the position misalignment occurs, so as to achieve waterproof effect without affecting the bending performance.

[0108] In one embodiment, such as Figures 9-10 As shown, the fan-out area 13 includes a bending portion 131 and a connecting portion 132. One end of the bending portion 131 is connected to the display area 11, and the other end is connected to the connecting portion 132. When the flexible display panel 1 is bent from a flattened state to a bent state, the bending portion 131 and the connecting portion 132 are arranged approximately along a third direction D3. The connecting portion 132 is used to bind to the driver chip. Among them, the first direction D1, the second direction D2, and the third direction are mutually perpendicular (the second direction is identified by D2, which is specifically the width direction of the flexible display panel 1; the third direction is identified by D3, which is specifically the thickness direction of the flexible display panel 1).

[0109] It should be noted that the bending portion 131 of the fan-out area 13 bends along the third direction D3, while the hinge of the bending area bends along the first direction D1, and the two are different.

[0110] Since the fan-out area 13 is located between the display area 11 and the connecting part 132, there is a certain height distance between the display area 11 and the connecting part 132 along the third direction D3, that is, the display area 11 is suspended, making it difficult to guarantee the positional stability of the display area 11.

[0111] Therefore, such as Figure 13As shown, the flexible display panel 1 also includes a support layer 6, which is disposed between the display area 11 and the connecting portion 132.

[0112] That is, along the third direction D3, the bottom of the support layer 6 is located on the side of the connecting part 132 facing the display area 11, and the top of the support layer 6 abuts against the side of the display area 11 facing the connecting part 132. The support layer 6 can support the display area 11, prevent the display area 11 from being suspended, and improve the positional stability of the display area 11.

[0113] A movable cavity 10 is formed between the support layer 6 and the fan-out area 13 on their respective sides. The fan-out area 13 and the support layer 6 are not tightly fitted together, and no other waterproof components are filled in the movable cavity 10. The movable cavity 10 is a hollow structure, that is, there is a certain distance between the support layer 6 and the fan-out area 13 along the first direction D1, so that the flexible display panel 1 has a certain amount of misalignment space during the bending process, thereby improving the reliability of the flexible display panel 1 in bending.

[0114] It is understandable that the fan-out area 13 has an arc-shaped structure, which serves as a smooth transition between the display area 11 and the connecting part 132. Therefore, the side of the active cavity 10 facing the fan-out area 13 also has an arc-shaped structure.

[0115] Specifically, such as Figure 13 As shown, the support layer 6 includes a first sub-support layer 61 and a second sub-support layer 62 stacked together. Along the third direction D3, the second sub-support layer 62 is disposed on the side of the connecting part 132 facing the display area 11, and the first sub-support layer 61 is disposed above the second sub-support layer 62. The first sub-support layer 61 can directly or indirectly support the display area 11.

[0116] Under normal circumstances, such as Figures 12-13 As shown, along the first direction D1, the length of the connecting portion 132 is less than the length of the display area 11. Along the third direction D3, the display area 11 and the connecting portion 132 have an overlapping portion. Therefore, a double-layer structure of a first sub-support layer 61 and a second sub-support layer 62 is provided near the fan-out area 13 to support the area between the connecting portion 132 and the display area 11. The first sub-support layer 61 is a flat structure. In the thickness direction of the flexible display panel 1, the portion where the display area 11 and the connecting portion 132 do not overlap only has the first sub-support layer 61, serving as a single-layer support structure to support the display area 11.

[0117] It should be noted that the support layer 6 includes, but is not limited to, a first sub-support and a second sub-support layer 62. There can be multiple second sub-support layers 62, which are stacked sequentially to adjust the thickness of the entire support layer 6. Adhesive layers or heat dissipation layers or other functional layers may be provided between adjacent sub-support layers 6.

[0118] Of course, the support layer 6 may also include a gasket layer 63, which is disposed on the side of the connecting part 132 facing the display area 11. The gasket layer 63 is located between the connecting part 132 and the support layer 6, so as to facilitate the support of the area between the connecting part 132 and the display area 11.

[0119] In one embodiment, the flexible display device further includes an SCF layer 8, located between the support layer 6 and the flexible display panel 1. Along the direction away from the flexible display panel 1, the SCF layer 8 includes an adhesive layer, a buffer layer, a support sublayer, and a heat dissipation layer stacked sequentially. The adhesive layer is used to bond to the flexible display panel 1, and may specifically be a mesh adhesive. The buffer layer provides cushioning and may be made of foam. The support sublayer serves as a substrate and provides support; may be made of polyimide. The heat dissipation layer dissipates heat and may be made of copper foil.

[0120] In one embodiment, such as Figures 12-13 As shown, the flexible display panel 1 also includes a cover layer 7, which is disposed on the side of the display area 11 along the third direction D3 and away from the connecting portion 132. The cover layer 7 is projected relative to the display area 11 externally to the sealing structure 2 relative to the display area 11, and the cover layer 7 is projected relative to the display area 11 externally to the transition layer 3 relative to the display area 11.

[0121] In this way, the coverage area of ​​the cover layer 7 extends from the display area 11 to the transition layer 3 and the sealing structure 2, which serves a protective function and is aesthetically pleasing.

[0122] Specifically, the cover layer 7 includes a cover plate 71 and a polarizer 72, which are sequentially stacked on the display area 11 of the flexible display panel 1 along the first direction D1. The cover plate 71 includes at least one of polyimide, polyethylene terephthalate, and triacetate cellulose film, extending along its edge to form an extension portion, i.e., the cover plate 71 extends outward by 0.3mm to 0.5mm. The sealing structure 2 just covers the extension portion, and the sealing structure 2 wraps around the flexible display panel 1 along the third direction D3 to achieve a sealing and waterproof effect.

[0123] In one embodiment, the flexible display device further includes a decorative layer 9, which covers the outer side of the cover plate 71 of the sealing structure 2 and the cover layer 7 along the first direction D1 and the third direction D3, respectively, and serves a decorative and aesthetic purpose.

[0124] In one embodiment, the sealing structure 2 includes a first sealing part 21 and a second sealing part 22 (e.g., Figure 8 As shown, a first sealing portion 21 is disposed on at least one side of the display area 11 along the second direction D2. A second sealing portion 22 is disposed on at least one side of the display area 11 along the second direction D2.

[0125] That is, the first sealing part 21 and the second sealing part 22 can be located on one or both sides of the display area 11 along the second direction D2 to seal the sidewall of the display area 11 along the width direction of the flexible display panel 1. For example, the first sealing part 21 and the second sealing part 22 are both located on both sides of the display area 11 along the second direction D2. The first sealing part 21 and the second sealing part 22 achieve sealing in the width direction of the flexible display panel 1. The part of the sealing structure 2 corresponding to the fan-out area 13 and the part corresponding to the adjustment gap 5 achieve sealing in the first direction D1 of the flexible display panel 1, so that the sealing structure 2 achieves sealing in the circumferential sidewall of the flexible display panel 1.

[0126] Specifically, the first sealing part 21 is correspondingly provided with the bending area 111, and the second sealing part 22 is correspondingly provided with the non-bending area 112. Since the bending area 111 needs to be bent, while the non-bending area 112 does not need to be bent, the first sealing part 21 and the second sealing part 22 correspond to the bending area 111 and the non-bending area 112, respectively. These two sealing parts are differentiated according to whether bending is required, and the bending area 111 and the non-bending area 112 are waterproofed separately, so as to meet the waterproofing requirements while also taking into account the bending performance requirements.

[0127] The modulus of the first sealing part 21 is smaller than that of the second sealing part 22. The smaller modulus of the first sealing part 21 allows for greater deformation, while the larger modulus of the second sealing part 22 results in less deformation. When the flexible display panel 1 is bent and shifts, the larger elastic deformation of the first sealing part 21 makes it easier to bend, improving the user experience.

[0128] For example, the modulus of the first sealing part 21 is 0 to 3 MPa, such as 0, 1 MPa, 1.5 MPa, 2 MPa and 3 MPa, and the modulus of the second sealing part 22 is 3 MPa to 20 MPa, such as 3 MPa, 5 MPa, 8 MPa, 10 MPa, 15 MPa and 20 MPa.

[0129] The thickness of the first sealing part 21 is less than the thickness of the second sealing part 22. By using the thinner first sealing part 21, it is easier to bend along with the bending area 111 of the flexible display panel 1, thereby improving the following effect of the first sealing part 21 relative to the bending area 111, making it smoother and more time-saving for the user when bending.

[0130] For example, the thickness of the first sealing part 21 is 0.05mm to 0.1mm, such as 0.05mm, 0.06mm, 0.07mm, 0.08mm and 0.1mm, etc., and the thickness of the second sealing part 22 is 0.1mm to 0.2mm, such as 0.1mm, 0.12mm, 0.15mm, 0.18mm and 0.2mm.

[0131] In one embodiment, both the first sealing portion 21 and the second sealing portion 22 may include a main component, a filler portion, an adhesion-promoting portion, and a catalyst portion. The main component is the primary component of the original slurry; the filler portion is an auxiliary component of the main component used to assist in achieving other functions; the adhesion-promoting portion is used to increase adhesion to the flexible display panel 1; and the catalyst is used to enhance the curing effect.

[0132] Specifically, the chemical formula of the main component is: X 3-n R n Si-(Z) d –(O) q -(R' y SiO (4-y) / 2 ) z –(SiR'2-Z) d -Si-R n X 3-n Specifically, it refers to organopolysiloxane polymer materials having two hydroxyl groups or being hydrolyzable. For each molecular formula, each X can be a hydroxyl or hydrolyzable group, each R can be an alkyl, alkenyl, or aryl group, each R' is an X group, an alkyl, alkenyl, or aryl group, and Z is a divalent organic group. Wherein, d is 0 or 1, q is 0 or 1, and d + q = 1; n is 0, 1, 2, or 3, y is 0, 1, or 2, n and y are preferably 2, and z is an integer.

[0133] Specifically, depending on the intended waterproofing function, the filler portion may be selected from silica fillers and treated with hydrophobic coating to meet sealing requirements. For example, silica fillers include precipitated silica (wet silica), pyrolytic silica (dry silica), calcined silica, etc., with the silica filler accounting for approximately 20% to 30% by weight.

[0134] Specifically, the adhesion-promoting component may be a silane adhesion promoter, with the silane adhesion promoter accounting for approximately 1% to 2% by weight.

[0135] Specifically, the catalyst comprises two materials: the first material comprises titanates and / or zirconates, and the second material comprises metal carboxylates.

[0136] By controlling the components of the original slurry, the degree of crosslinking, molecular weight, and intermolecular forces of the sealed structure 2 after curing are adjusted to ensure that the modulus of the first sealing part 21 corresponding to the bending area is ≤3 MPa, for example, 1 MPa, 1.5 MPa, 1.8 MPa, 2 MPa, and 3 MPa, and the modulus of the second sealing part 22 corresponding to the non-bending area is approximately 3 MPa to 20 MPa, for example, 3 MPa, 5 MPa, 10 MPa, 13 MPa, and 20 MPa.

[0137] In some other embodiments, for the first sealing part 21, d = 0, R is an alkenyl polymer, and X and R' are hydrocarbon groups, and the modulus of the first sealing part 21 after curing is ≤ 3 MPa; for the second sealing part 22, d = 0, X, R', and Rn are alkenyl polymers, and the catalyst content or weight ratio of the first sealing part 21 and the second sealing part 22 is the same, or the second sealing part 22 can be increased proportionally as needed.

[0138] In some other embodiments, for the first sealing portion 21, d = 0, R n It is an alkenyl polymer, where X and R' are hydrocarbon groups. After curing, the modulus of the first sealing part 21 is ≤3 MPa; for the second sealing part 22, d = 0, R n R is an alkenyl polymer, R' is an aryl polymer, the catalyst content or weight ratio of the first sealing part 21 and the second sealing part 22 are the same, or the second sealing part 22 can be increased proportionally as needed.

[0139] In some other embodiments, for the first sealing portion 21, d = 0, R n X is an alkyl group, and R' is an alkenyl polymer; for the second sealing part 22, R n X and R' are both alkenyl polymers.

[0140] In some other embodiments, the modulus of both the first sealing part 21 and the second sealing part 22 is ≤3 MPa, and the viscosity of the original slurry is ≤30000 mPa·s, which conforms to the crosslinking mechanism of condensation-type silicone rubber, and can be cured at room temperature and humidity (e.g.) Figure 14 As shown in the figure, it may also not have the transition layer 3 and the adjustment gap 5.

[0141] In one embodiment, the sealing structure 2 includes at least one of epoxy resin, polyurethane, acrylic resin, and ethylene-vinyl acetate copolymer. Meanwhile, the first sealing portion 21 has a tensile strength ≥12 MPa, an elongation at break ≥110%, and a surface adhesion ≥5 MPa.

[0142] For example, the curing temperature of the sealing structure 2 is ≤80℃, which can be heat-cured, moisture-cured, or UV-cured. After curing, the sealing structure 2 has a modulus ≤3MPa, a hardness of 20-85 Shore A, a CTE ≤250ppm / ℃, and a peel force ≥5MPa (SUS301 interface). SUS301 is a commonly used testing material with a dispensing accuracy of approximately 0.09mm. It can meet the bending requirements of a bending radius of 10mm and a bending angle of 60°~90°, and meet the requirements of a waterproof rating of 5ATM (50 meters of water pressure) or higher.

[0143] like Figures 15-16 As shown, this embodiment also provides a wearable device 100, including the aforementioned flexible display device. The wearable device 100 includes, but is not limited to, watches, wristbands, foldable screen phones, etc.

[0144] Wearable device 100 can meet bending requirements while maintaining functional integrity. Compared to mobile phones, wearable device 100 has a smaller usable area. Electronic components will pass through the bending area 111. The hinge 201 of the bending area 111 will affect the sealing of wearable device 100. Therefore, the sealing structure 2 can be used to waterproof each part of the bending area 111 and the non-bending area 112 separately, meeting the waterproofing and bending performance requirements simultaneously.

[0145] This embodiment also provides a method for manufacturing a flexible display device, used to manufacture the aforementioned flexible display device. The method for manufacturing a flexible display device includes the following steps:

[0146] The fan-out area 13 of the flexible display panel 1 is bent to the backlight side of the display area 11;

[0147] The transition layer 3 is wrapped around the outside of the fan-out region 13;

[0148] The sealing structure 2 is wrapped around the edge of the flexible display panel 1 and the outside of the transition layer 3.

[0149] In one embodiment, such as Figure 17 As shown, after applying adhesive in a ring around the circumference of the flexible display panel 1, multiple rings are then stacked along the third direction D3. This multi-layered 3D adhesive application method ensures that the edges of both the flexible display panel 1 and the transition layer 3 are covered with adhesive, resulting in good sealing.

[0150] For example, the thickness of the first layer of adhesive along the third direction D3 is approximately 0.05mm to 0.3mm, such as 0.05mm, 0.1mm, 0.2mm, 0.25mm, 0.3mm, etc., with an accuracy of approximately ±0.05-±0.1mm, such as ±0.05mm, ±0.06mm, ±0.07mm, ±0.08mm, ±0.09mm, ±0.1mm, etc. After the first layer of adhesive has cured, a second layer of adhesive is applied, for a total of 3 to 4 layers. The thickness of the bending area 111 and the non-bending area 112 are different, the number of layers can be different, and the size of each layer of adhesive will also be different.

[0151] In one embodiment, when applying adhesive in one ring, after applying adhesive to both sides of the bending area 111 along the width direction of the flexible display panel 1, adhesive is then applied to the outside of the non-bending area 112, the fan-out area 13, and the end area 14. That is, adhesive is applied to the bending area 111 first, and after the adhesive in this area has cured, adhesive is applied to the non-bending area 112.

[0152] Specifically, the dispensing steps in the manufacturing method of the flexible display device are as follows:

[0153] 1. After testing the viscosity and rheological properties of the raw slurry, the parameters such as nozzle diameter, nozzle speed, line spacing, air pressure and layer height are preliminarily confirmed based on the relevant properties.

[0154] 2. Pour the raw slurry material into the feed cylinder 200;

[0155] 3. The dispensing needle of the material cylinder 200 is opened or closed by means of a solenoid valve or a screw driven by a motor;

[0156] 4. Precisely control the extruded glue flow rate through the alignment platform;

[0157] 5. Measure the dimensions and thickness of the sample after dispensing, adjust relevant parameters, and optimize the accuracy.

[0158] 6. Based on the optimized process parameters, apply the adhesive to the flexible display panel 1 horizontally on the carrier. The material cylinder 200 applies adhesive precisely along the application position. After applying adhesive to both sides of the bending area 111 along the second direction D2, apply adhesive to the outside of the non-bending area 112, the fan-out area 13, and the end area 14. At the same time, apply adhesive to the overlapping area at the junction of the bending area 111 and the non-bending area 112, within a range of approximately 5mm-10mm, so that the entire edge of the flexible display panel 1 is covered with adhesive to ensure sealing.

[0159] 7. After applying adhesive to the outside of the flexible display panel 1 and along the circumference of the flexible display panel 1, multiple layers are stacked along the third direction D3.

[0160] It should be noted that although the steps of the flexible display device manufacturing method of this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0161] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A flexible display device, characterized in that, include: A flexible display panel having a display area and a peripheral area, the peripheral area being arranged around the display area, and a fan-out area being provided on the side of the peripheral area along a first direction away from the display area; A sealed structure covers the edge of the flexible display panel; A transition layer covers the outside of the fan-out area, and the transition layer is disposed between the fan-out area and the sealing structure; The flexible display panel has an end area along the first direction and away from the fan-out area. The display area includes a bent area and a non-bent area, which are arranged along the first direction. The bent area has multiple hinges that are hinged to each other. An adjustment gap is provided between the end area and the sealing structure.

2. The flexible display device according to claim 1, characterized in that, The modulus of the transition layer is less than the modulus of the fan-out portion of the sealing structure; and / or, The thickness of the transition layer is less than the thickness of the portion of the sealing structure corresponding to the fan-out area.

3. The flexible display device according to claim 2, characterized in that, The modulus of the transition layer is 0.5 MPa to 3 MPa, and the modulus of the sealing structure corresponding to the fan-out region is 3 MPa to 10 MPa; and / or, The thickness of the transition layer is 0.05mm to 0.3mm, and the sum of the thickness of the sealing structure corresponding to the fan-out area and the thickness of the transition layer is 0.3mm to 0.5mm.

4. The flexible display device according to claim 1, characterized in that, The number of transition layers is plurality of, and along the first direction and from the fan-out region to the sealing structure, the modulus of the plurality of transition layers gradually increases; and / or The number of transition layers is multiple, and the thickness of the multiple transition layers gradually increases along the first direction and from the fan-out area to the sealing structure.

5. The flexible display device according to claim 1, characterized in that, The transition layer comprises a polyacrylate thermoplastic material.

6. The flexible display device according to claim 1, characterized in that, The flexible display device further includes: A protective layer covers the outside of the fan-out area, and the protective layer is disposed between the fan-out area and the transition layer.

7. The flexible display device according to claim 1, characterized in that, The adjustment gap is positively correlated with the length of the bending zone, the adjustment gap is positively correlated with the bending angle of the bending zone, and the adjustment gap is negatively correlated with the bending radius of the bending zone.

8. The flexible display device according to claim 1, characterized in that, The sealing structure has a groove on the side facing the end region.

9. The flexible display device according to claim 1, characterized in that, The display area includes a bent area and a non-bent area, and the bent area and the non-bent area are arranged along a first direction; The sealing structure includes: A first sealing portion is disposed on at least one side of the display area along the second direction, the first sealing portion and the bending area are correspondingly disposed, and the second direction is perpendicular to the first direction; The second sealing part is disposed on at least one side of the display area along the second direction, and the second sealing part and the non-bending area are disposed correspondingly; Wherein, the modulus of the first sealing part is less than the modulus of the second sealing part; and / or, the thickness of the first sealing part is less than the thickness of the second sealing part.

10. The flexible display device according to claim 9, characterized in that, The modulus of the first sealing part is 0-3 MPa, and the modulus of the second sealing part is 3 MPa-20 MPa; and / or, The thickness of the first sealing part is 0.05mm to 0.1mm, and the thickness of the second sealing part is 0.1mm to 0.2mm.

11. The flexible display device according to claim 9, characterized in that, The tensile strength of the first sealing part is ≥12 MPa, the elongation at break of the first sealing part is ≥110%, and the surface adhesion of the first sealing part is ≥5 MPa.

12. The flexible display device according to claim 1, characterized in that, The sealing structure comprises an organopolysiloxane polymer material, silica filler, silane adhesion promoter, and catalyst; or, The sealing structure includes at least one of epoxy resin, polyurethane, acrylic, and ethylene-vinyl acetate copolymer.

13. The flexible display device according to claim 1, characterized in that, The fan-out area includes a bent portion and a connecting portion. One end of the bent portion is connected to the display area, and the other end is connected to the connecting portion. The bent portion and the connecting portion are arranged along a third direction, and the third direction, the first direction, and the second direction are perpendicular to each other. The flexible display device further includes a support layer, which is disposed between the display area and the connecting portion; A movable cavity is formed between the support layer and the fan-out area on their adjacent sides.

14. The flexible display device according to claim 13, characterized in that, The flexible display panel also includes: A cover layer is disposed on the side of the display area along a third direction and away from the connecting portion; Wherein, the cover layer is located outside the orthographic projection of the sealing structure relative to the display area, and the cover layer is located outside the orthographic projection of the transition layer relative to the display area.

15. A wearable device, characterized in that, Includes the flexible display device according to any one of claims 1-14.

16. A method for manufacturing a flexible display device, characterized in that, The method for manufacturing the flexible display device according to any one of claims 1-14 includes the following steps: The fan-out area of ​​the flexible display panel is bent to the backlight side of the display area; The transition layer covers the outside of the fan-out region; The sealing structure is wrapped around the edges of the flexible display panel and the outside of the transition layer.

17. The method for manufacturing a flexible display device according to claim 16, characterized in that, Encapsulating the edge and transition layer of the flexible display panel with a sealing structure includes the following steps: After applying adhesive in a ring around the outside of the flexible display panel and along its circumference, multiple rings are then stacked along a third direction.

18. The method for manufacturing a flexible display device according to claim 17, characterized in that, When applying adhesive in one layer, after applying adhesive to both sides of the bending area along the width direction of the flexible display panel, apply adhesive to the outside of the non-bending area, the fan-out area, and the end area.

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