Composite supporting structure, display device and preparation method of composite supporting structure

Abstract

The invention provides a composite supporting structure, a display device and a preparation method of the composite supporting structure, the composite supporting structure comprises a supporting layer and a connecting layer, the supporting layer comprises a supporting subpart, the supporting subpart forms a plurality of first gaps, and the first gaps are arranged at intervals; the connecting layer comprises a first part in contact with the supporting subpart and a second part at least partially located in the first gap, and the Young modulus of the first part is different from that of the second part. In the embodiment of the invention, the bending requirement of the composite supporting structure can be met by means of part of larger deformation, and the distance difference between the supporting sub-parts and the display screen at different positions is reduced through part of smaller deformation, so that the problem of die marks of the display device is reduced, and the use impression and reliability of the display device are improved.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a composite support structure, a display device, and a method for preparing the composite support structure. Background Art

[0002] With the development of science and technology, the field of display devices has also made great progress, and people's requirements for display devices have become increasingly stringent. On this basis, display devices that can realize deformation functions have come into being. However, how to improve the display effect and reliability of this type of display device has become one of the research directions of many manufacturers. Summary of the invention

[0003] The embodiments of the present application provide a composite support structure, a display device, and a method for preparing the composite support structure, which can improve the viewing experience and reliability of the display device.

[0004] In a first aspect, an embodiment of the present application provides a composite support structure, comprising:

[0005] A support layer, the support layer includes a support sub-section, the support sub-section forms a plurality of first gaps, and the plurality of first gaps are arranged at intervals;

[0006] The connecting layer includes a first portion contacting the supporting sub-portion and a second portion at least partially located in the first gap, and the Young's modulus of the first portion is different from that of the second portion.

[0007] In some embodiments, the Young's modulus of the first portion is greater than the Young's modulus of the second portion;

[0008] In some embodiments, the first portion and the second portion are made of different materials; or, the first portion and the second portion are made of the same material;

[0009] In some embodiments, the supporting sub-section is an integrated structure, and the first gap is the area enclosed by the supporting sub-section; or, there are multiple supporting sub-sections, and when the composite supporting structure is in a flattened state, the multiple supporting sub-sections are spaced apart along the first direction, and the first gap is located between two adjacent supporting sub-sections.

[0010] In some embodiments, the first portion includes a first sub-portion disposed on one side of the supporting sub-portion, and a projection of the first sub-portion in a thickness direction of the composite supporting structure at least covers a projection of the supporting sub-portion in the thickness direction of the composite supporting structure;

[0011] In some embodiments, the Young's modulus of the first subsection is greater than the Young's modulus of the second subsection;

[0012] In some embodiments, a projection of the first sub-portion in the thickness direction of the composite support structure overlaps with a projection of the first gap in the thickness direction of the composite support structure.

[0013] In some embodiments, the first subsection at least partially covers the second section;

[0014] In some embodiments, the first subsection covers the entire second section;

[0015] In some embodiments, the second portion is disposed in contact with a side wall of the corresponding support sub-portion;

[0016] Alternatively, the first portion further includes a second sub-portion connected to the first sub-portion and located in the first gap, and the second sub-portion is disposed in contact with a side wall of the corresponding supporting sub-portion;

[0017] In some embodiments, a surface of the second portion facing the first sub-portion is flush with a surface of the supporting sub-portion facing the first sub-portion.

[0018] In some embodiments, the first portion further includes a second sub-portion connected to the first sub-portion and located in the first gap, and the second sub-portion is disposed in contact with a side wall of the corresponding supporting sub-portion;

[0019] wherein the second portion is connected to the second sub-portion, and the Young's modulus of the second sub-portion is greater than the Young's modulus of the second portion;

[0020] In some embodiments, the Young's modulus of the first subsection is the same as the Young's modulus of the second subsection;

[0021] In some embodiments, the first subsection covers the second subsection;

[0022] In some embodiments, the first subsection is integrally arranged with the second subsection;

[0023] In some embodiments, the second portion is connected to the first sub-portion and the second sub-portion located on the same side;

[0024] In some embodiments, a surface of the first sub-portion away from the supporting sub-portion is flush with a surface of the second portion away from the first gap.

[0025] In some embodiments, the first portion and the second portion comprise the same material, and the curing degree of the first portion is greater than the curing degree of the second portion;

[0026] In some embodiments, the connecting layer includes at least one of solid optical glue, liquid optical glue, thermoplastic polyurethane elastomer rubber, and silicone rubber;

[0027] In some embodiments, the first portion is integrally provided with the second portion;

[0028] In some embodiments, the first part and the second part both include a photoinitiator, and the concentration of the photoinitiator in the first part is greater than the concentration of the photoinitiator in the second part;

[0029] Preferably, the supporting sub-part comprises stainless steel, titanium or carbon fiber or the like.

[0030] In some embodiments, the Young's modulus E1 of the first portion and the Young's modulus E2 of the second portion satisfy: E1 ≥ 3E2;

[0031] In some embodiments, the first part and the second part both include liquid optical adhesive, and E1 and E2 satisfy: 15 KPa≤E1≤87 KPa, 5 KPa≤E2≤20 KPa;

[0032] Alternatively, the first part and the second part both include thermoplastic polyurethane elastomer rubber, and E1 and E2 satisfy: 100MPa≤E1≤800MPa, 10MPa≤E2≤300MPa;

[0033] Alternatively, the first part and the second part both include silica gel, and E1 and E2 satisfy: 15MPa≤E1≤30MPa, 5MPa≤E2≤10MPa.

[0034] In some embodiments, the second portion is provided with at least one groove, the groove being formed by a depression in the surface of the second portion on the same side as the supporting sub-portion;

[0035] In some embodiments, in a thickness direction of the composite support structure, a depth of the groove is less than a thickness of the second portion.

[0036] In some embodiments, the first portion includes a first sub-portion disposed on one side of the supporting sub-portion, the thickness of the supporting sub-portion is h1, the minimum thickness of the first sub-portion is h2, and h1 and h2 satisfy: h2 ≥ 1 / 2h1;

[0037] In some embodiments, h1 ≥ h2;

[0038] In some embodiments, 50 μm ≤ h1 ≤ 200 μm;

[0039] In some embodiments, the supporting sub-section includes a second curved surface facing the first sub-section, and the second curved surface protrudes toward the first sub-section. The minimum thickness h2 of the first sub-section is the minimum distance between the second curved surface and the surface of the first sub-section on the side facing away from the supporting sub-section in the thickness direction of the composite support structure.

[0040] In some embodiments, the supporting sub-portion includes a first surface facing away from the first portion, the first surface includes a first arcuate surface, and a plurality of first arcuate surfaces and a plurality of first gaps are alternately arranged in the first direction;

[0041] Wherein, the first arc-shaped surface is arranged to protrude toward the first part;

[0042] In some embodiments, the supporting sub-portion further includes a second surface facing the first portion, the second surface includes a second arc-shaped surface, and the second arc-shaped surface is protruded toward the direction of the first portion;

[0043] In some embodiments, the Young's modulus of the support sub-portion is greater than the Young's modulus of the first portion; and / or the Young's modulus of the support sub-portion is greater than the Young's modulus of the second portion.

[0044] In a second aspect, an embodiment of the present application provides a composite support structure, including:

[0045] The support layer includes a support sub-section, the support sub-section forms a plurality of first gaps, and the plurality of first gaps are arranged at intervals;

[0046] The connecting layer comprises a first sub-portion arranged on one side of the supporting sub-portion, wherein a projection of the first sub-portion in the thickness direction of the composite supporting structure at least covers a projection of the supporting sub-portion in the thickness direction of the composite supporting structure;

[0047] The thickness of the supporting sub-portion is h1, the minimum thickness of the first sub-portion is h2, and h1 and h2 satisfy: h2≥1 / 2h1.

[0048] In some embodiments, the connecting layer further comprises a second portion at least partially located within the first gap, and the Young's modulus of the first sub-portion is greater than the Young's modulus of the second portion;

[0049] In some embodiments, an orthographic projection of the first sub-portion in the thickness direction of the composite support structure overlaps with an orthographic projection of the first gap in the thickness direction of the composite support structure;

[0050] In some embodiments, h1 ≥ h2;

[0051] In some embodiments, 50 μm≤h1≤200 μm.

[0052] In some embodiments, the first subsection at least partially covers the second section;

[0053] In some embodiments, the first subsection covers the entire second section;

[0054] In some embodiments, the second portion is disposed in contact with a side wall of the corresponding support sub-portion;

[0055] In some embodiments, a surface of the second portion facing the first sub-portion is flush with a surface of the supporting sub-portion facing the first sub-portion.

[0056] In some embodiments, the connection layer further includes a second sub-portion connected to the first sub-portion and located in the first gap, and the second sub-portion is disposed in contact with a side wall of the corresponding support sub-portion;

[0057] wherein the second portion is connected to the second sub-portion, and the Young's modulus of the second sub-portion is greater than the Young's modulus of the second portion;

[0058] In some embodiments, the Young's modulus of the first subsection is the same as the Young's modulus of the second subsection;

[0059] In some embodiments, the first subsection covers the second subsection;

[0060] In some embodiments, the first subsection is integrally arranged with the second subsection;

[0061] In some embodiments, the first subsection, the second subsection, and the second portion are integrally arranged;

[0062] In some embodiments, the first subsection, the second subsection, and the second portion comprise the same material, and the first subsection has a greater degree of cure than the second portion;

[0063] In some embodiments, the connecting layer includes at least one of solid optical glue, liquid optical glue, thermoplastic polyurethane elastomer rubber, and silicone rubber;

[0064] In some embodiments, the second portion is connected to the first sub-portion and the second sub-portion located on the same side;

[0065] In some embodiments, a surface of the first sub-portion away from the supporting sub-portion is flush with a surface of the second portion away from the first gap.

[0066] In a third aspect, an embodiment of the present application provides a display device, comprising a scroll, a display screen, and a composite support structure as described in any of the foregoing embodiments, wherein the support layer is arranged on the non-light-emitting side of the display screen, and the display screen and the composite support structure can be rolled up around the scroll.

[0067] In some embodiments, the supporting sub-portion includes a first surface facing away from the display screen, the first surface includes a first arcuate surface, and a plurality of first arcuate surfaces and a plurality of first gaps are alternately arranged in the winding direction;

[0068] Wherein, the first curved surface is protruding toward the display screen;

[0069] In some embodiments, at least some of the first curved surfaces have different radii;

[0070] In some embodiments, the display device includes a first state and a second state, in which the display screen is in a flat state in the first state, and in the second state, the display screen is in a curved state and is rolled up on a reel;

[0071] In the second state, the support layer is arranged around the scroll with n turns, and the radius of the first arc surface is r, and r satisfies: r=R+(i-1)h3, wherein R is the radius of the scroll, h3 is the total thickness of the display screen and the composite support structure, i is the number of turns of the support layer at the position of the first arc surface, and i is a positive integer not greater than n;

[0072] In some embodiments, in the second state, the size of the first arcuate surface at the first circle in the winding direction is L1, and the size of the first arcuate surface at the i-th circle in the winding direction is Li, and L1 and Li satisfy: L1≤Li≤L1*(R+(i-1)h3) / R;

[0073] In some embodiments, Li=L1*(R+(i-1)h3) / R.

[0074] In a fourth aspect, an embodiment of the present application provides a method for preparing a composite support structure, comprising:

[0075] Providing a support material layer, patterning the support material layer to form a support sub-section, wherein the support sub-section forms a plurality of first gaps spaced apart from each other;

[0076] An initial glue layer is formed on one side of the supporting sub-part, wherein a portion of the initial glue layer is located in the first gap and covers the surface of the supporting sub-part;

[0077] The initial adhesive layer is processed to form a connecting layer, which includes a first portion in contact with the supporting sub-portion and a second portion at least partially located in the first gap, and the Young's modulus of the first portion is different from that of the second portion.

[0078] In some embodiments, the processing of the initial glue layer includes:

[0079] A shielding layer is formed on one side of the initial glue layer, wherein the projection of the shielding layer in the thickness direction of the supporting sub-portion is located within the projection of the first gap in the thickness direction of the supporting sub-portion;

[0080] Curing the initial adhesive layer from the side of the shielding layer away from the initial adhesive layer to form a first part and a second part;

[0081] In some embodiments, the curing process comprises an optical curing process;

[0082] In some embodiments, before forming the shielding layer on one side of the initial glue layer, the method further includes:

[0083] Performing a pre-curing treatment on the initial adhesive layer, wherein the pre-curing treatment uses a light source with a first energy intensity W1 to optically cure the initial adhesive layer;

[0084] In curing the initial adhesive layer from the side of the shielding layer away from the initial adhesive layer, a light source with a second energy intensity W2 is used to optically cure the initial adhesive layer;

[0085] Among them, W2>W1.

[0086] In some embodiments, the processing of the initial glue layer includes:

[0087] Curing the initial glue layer, and slotting the cured initial glue layer to form a first part and a receiving hole in the first part;

[0088] forming a second portion in the receiving hole, wherein the first portion and the second portion comprise different materials, and the Young's modulus of the first portion is greater than the Young's modulus of the second portion;

[0089] In some embodiments, during the grooving process of the initial glue layer, the receiving hole is set through the first portion.

[0090] In some embodiments, a support material layer is provided, the support material layer is patterned to form support sub-sections and a plurality of first gaps spaced apart from each other are formed by the support sub-sections, and the support material layer is formed on a substrate;

[0091] After processing the initial glue layer, it also includes:

[0092] The support sub-portion is separated from the base.

[0093] In a fifth aspect, an embodiment of the present application provides a method for preparing a composite support structure, comprising:

[0094] Providing an initial adhesive layer, curing the initial adhesive layer, and slotting the cured initial adhesive layer to form a connecting layer, wherein the connecting layer has a plurality of accommodating portions arranged at intervals;

[0095] Providing a support material layer, and patterning the support material layer to form support sub-parts arranged at intervals;

[0096] The supporting sub-sections are arranged in corresponding accommodating sections to form a composite supporting structure; wherein the connecting layer includes a first portion in contact with the supporting sub-sections, and a second portion at least partially located between adjacent supporting sub-sections, and the Young's modulus of the first portion is different from that of the second portion.

[0097] In some embodiments, curing the initial glue layer and slotting the cured initial glue material include:

[0098] Pre-curing the initial adhesive layer;

[0099] Preferably, the process of curing the initial glue layer and grooving the cured initial glue material further includes:

[0100] A shielding layer is formed on one side of the initial adhesive layer after the pre-curing treatment, and the projection of the shielding layer in the thickness direction is located between the projections of adjacent accommodating parts in the thickness direction;

[0101] The initial glue layer after the pre-curing treatment is cured from one side of the shielding layer to form a first part and a second part.

[0102] In some embodiments, the process of performing a groove process on the cured initial glue material includes:

[0103] The initial glue layer after curing is provided with receiving holes and receiving parts, and the receiving parts are located between adjacent receiving holes;

[0104] forming a second portion in the receiving hole, wherein the first portion and the second portion comprise different materials, and the Young's modulus of the first portion is greater than the Young's modulus of the second portion;

[0105] In some embodiments, during the process of grooving the initial glue layer, the receiving hole penetrates the initial glue layer.

[0106] The embodiment of the present application provides a composite support structure, a display device, and a method for preparing the composite support structure. The Young's modulus of the first part and the second part are different. When the composite support structure is bent, the part with a larger Young's modulus will have a smaller deformation, while the part with a smaller Young's modulus will have a larger deformation. In this way, the bending requirements of the composite support structure can be met by virtue of the larger deformation of the part, and the smaller deformation of the part can be used to reduce the distance difference between the support sub-part and the display screen at different positions, thereby reducing the problem of mold printing on the display device and improving the viewing experience and reliability of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0107] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0108] Figure 1 is a schematic cross-sectional structure diagram of a composite support structure provided in an embodiment of the present application;

[0109] Figure 2 is a schematic structural diagram of a display device provided by an embodiment of the present application in a first state;

[0110] Figure 3is a structural schematic diagram of a support layer in a composite support structure provided in an embodiment of the present application;

[0111] Figure 4 is a schematic cross-sectional structure diagram of another composite support structure provided in an embodiment of the present application;

[0112] Figure 5 is a schematic cross-sectional structure diagram of another composite support structure provided in an embodiment of the present application;

[0113] Figure 6 is a schematic diagram of a cross-sectional structure of another composite support structure provided in an embodiment of the present application;

[0114] Figure 7 is a schematic cross-sectional structure diagram of another composite support structure provided in an embodiment of the present application;

[0115] Figure 8 is a schematic diagram of a cross-sectional structure of another composite support structure provided in an embodiment of the present application;

[0116] Fig. 9 is a schematic structural diagram of a display device provided by an embodiment of the present application in a second state;

[0117] Fig.10 yes Fig. 9 Schematic diagram of the enlarged structure at the middle area Q;

[0118] Fig.11 is a flow chart of a method for preparing a composite support structure provided in an embodiment of the present application;

[0119] Figures 12a to 12c It is a process structure schematic diagram of a method for preparing a composite support structure provided in an embodiment of the present application;

[0120] Fig.13 is a flow chart of another method for preparing a composite support structure provided in an embodiment of the present application;

[0121] Figure 14a to Figure 14b It is a process structure schematic diagram of another method for preparing a composite support structure provided in an embodiment of the present application;

[0122] Fig.15 is a flow chart of another method for preparing a composite support structure provided in an embodiment of the present application;

[0123] Fig.16 is a flow chart of another method for preparing a composite support structure provided in an embodiment of the present application;

[0124] Figure 17a to Figure 17b It is a process structure schematic diagram of another method for preparing a composite support structure provided in an embodiment of the present application;

[0125] Fig.18 It is a process structure schematic diagram of another method for preparing a composite support structure provided in an embodiment of the present application;

[0126] Fig.19 is a flow chart of another method for preparing a composite support structure provided in an embodiment of the present application;

[0127] Fig. 20 is a flow chart of another method for preparing a composite support structure provided in an embodiment of the present application;

[0128] Figures 21a to 21c It is a process structure schematic diagram of another method for preparing a composite support structure provided in an embodiment of the present application;

[0129] Fig. 22 is a flow chart of another method for preparing a composite support structure provided in an embodiment of the present application;

[0130] Fig.23 is a flow chart of another method for preparing a composite support structure provided in an embodiment of the present application;

[0131] Figure 24a to Figure 24b This is a schematic diagram of the process structure of another method for preparing a composite support structure provided in an embodiment of the present application.

[0132] Marking Description:

[0133] 100. composite support structure; 200. display device;

[0134] 10. Support layer; 11. Support sub-part; 111. First arc-shaped surface; 112. Second arc-shaped surface; 113. First surface; 114. Second surface; 12. First gap;

[0135] 20. connecting layer; 21. first part; 211. first sub-part; 212. second sub-part; 22. second part; 221. groove;

[0136] 30. Display screen;

[0137] 40. Scroll;

[0138] 50. Base;

[0139] 60. Occlusion layer;

[0140] 20', initial adhesive layer; 21', receiving hole; 22', receiving portion;

[0141] X, first direction; Y, second direction; Z, thickness direction. DETAILED DESCRIPTION

[0142] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0143] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0144] As an advanced form of deformable screen, flexible display devices that can achieve a curling effect have been widely researched and developed in the display industry. They can not only increase the display area during use, but also reduce the volume of the terminal product during carrying. Flexible display devices are deeply loved by users due to their large display area. As time goes by, users' requirements for flexible display devices are also increasing. However, in existing flexible display devices, in the flattened state, obvious mold prints are likely to appear on the display surface of the flexible display panel, thereby affecting the user's picture perception and touch experience.

[0145] Regarding the above issues, please refer to Figure 1 and Figure 2 An embodiment of the present application provides a composite support structure 100, which includes a support layer 10 and a connecting layer 20. The support layer 10 includes a support sub-portion 11, and the support sub-portion 11 forms a plurality of first gaps 12, and the plurality of first gaps 12 are arranged at intervals. The connecting layer 20 includes a first portion 21 in contact with the support sub-portion 11 and a second portion 22 at least partially located in the first gap 12. The Young's modulus of the first portion 21 is different from that of the second portion 22.

[0146] The composite support structure 100 is a structure used in the display device 200 and used to support the display screen 30. The composite support structure 100 includes at least a support layer 10 and a connecting layer 20. The support layer 10 is the main part of the composite support structure 100 for supporting, and the connecting layer 20 is the main part of the composite support structure 100 for connecting the display screen 30.

[0147] It should be noted that, in order to meet the deformation requirements of the display device 200 formed later, the composite support structure 100 itself can be relatively bent, so as to meet the curling deformation requirements of the display device 200. In other words, the composite support structure 100 itself has at least a flat state and a bent state. In the flat state, the composite support structure 100 is in a straight state, and in the bent state, the composite support structure 100 is in a bent state. For ease of understanding, unless otherwise specified in the following description of this application, the composite support structure 100 is described in the flat state.

[0148] The support layer 10 includes a support sub-portion 11, and the first gap 12 is a cavity structure defined by the support sub-portion 11. The support sub-portion 11 can have various forms, for example, the support sub-portion 11 can be in a strip-shaped structure and multiple support sub-portions 11 are provided, and multiple support sub-portions 11 are arranged at intervals and the first gap 12 is formed between adjacent support sub-portions 11, or the support sub-portion 11 can also be in a planar structure, and multiple hole structures are provided on the planar structure, and the hole structures are the first gaps 12.

[0149] There are multiple first gaps 12, and the multiple first gaps 12 can be spaced apart only along a single direction, or can be arranged in an array along multiple directions at the same time, or can be spaced apart in other regular or irregular arrangements, which is not limited in this embodiment of the present application.

[0150] The connection layer 20 includes at least a first portion 21 and a second portion 22, wherein the first portion 21 is a portion of the connection layer 20 that is in contact with the support sub-portion 11, and the first portion 21 may have a variety of positional relationships relative to the support sub-portion 11. Exemplarily, the first portion 21 may be disposed only in contact with a surface of one side of the support sub-portion 11 in its own thickness direction Z, or the first portion 21 may be partially disposed in contact with a surface of one side of the support sub-portion 11 in its own thickness direction Z, and partially disposed in contact with a side wall of the support sub-portion 11 for enclosing and forming the first gap 12.

[0151] The second portion 22 is at least partially located in the first gap 12, and the second portion 22 can have a variety of positional relationships relative to the first gap 12, for example, the second portion 22 can be completely located in the first gap 12, or the second portion 22 can also be partially located in the first gap 12, and partially exceeds at least one opening of the first gap 12 in the thickness direction Z of the support layer 10. According to different actual needs, the second portion 22 can be arranged in close contact with the support sub-portion 11, or the second portion 22 can be arranged at a distance from the support sub-portion 11.

[0152] In the related art, a support member is provided on one side of the backlight surface of the flexible screen, and there is also a glue layer structure between the support member and the flexible screen, and the support member and the flexible screen are relatively fixed to each other through the glue layer structure. During the preparation process, a glue layer structure is usually formed on one side of the backlight surface of the flexible screen first, and then a support member is formed on the side of the glue layer structure away from the flexible screen, so that in the final product, there is no glue layer structure in the gap space defined by the support member.

[0153] Furthermore, during the curling process of the display device 200, the flexible screen, the support member and the adhesive layer structure will all bend and deform relative to the roller. At the position corresponding to the smaller bending radius, due to the limitations of the size and shape of the support member itself, the support member cannot fully fit with the roller, thereby causing the gap space to be expanded under the action of the tensioning force.

[0154] On this basis, since the structural strength of the glue layer structure is relatively low and there is no glue layer structure in the gap space, the glue layer structure may squeeze glue into the gap space, causing the thickness of the glue layer structure between the support member and the flexible screen near the gap space to become thinner, resulting in differences in the distance between the support member and the flexible screen at different positions, which in turn causes mold printing problems in the display device 200, affecting the viewing experience and reliability of the display device 200.

[0155] In view of this, the embodiment of the present application adjusts the relationship between the support layer 10 and the connection layer 20. Specifically, since the first portion 21 is in contact with the support sub-portion 11, the existence of the first portion 21 can separate the support sub-portion 11 from the display screen 30. On this basis, the connection layer 20 also includes a second portion 22 at least partially located in the first gap 12, and the first portion 21 and the second portion 22 can have different Young's modulus. The Young's modulus mentioned here is a physical quantity that describes the ability of a solid structure to resist deformation.

[0156] Furthermore, in the embodiment of the present application, when the composite support structure 100 is deformed together with the display screen 30, the second portion 22 having a different Young's modulus from the first portion 21 can prevent the first portion 21 from entering the first gap 12. In other words, the presence of the second portion 22 can reduce the deformation of the first portion 21, thereby reducing the distance difference between the support sub-portion 11 and the display screen 30 at different positions, thereby reducing the problem of mold imprinting on the display device 200 and improving the appearance and reliability of the display device 200.

[0157] It should be noted that the present embodiment does not limit the preparation order of the composite support structure 100 relative to the display screen 30. Optionally, the support layer 10 and the connection layer 20 may be prepared and fixed first, and then both may be fixedly connected to the display screen 30, or the connection layer 20 may be formed on one side of the display screen 30, and then the support layer 10 may be formed, as long as the display device 200 formed in the end can simultaneously contain the composite support structure 100 including the support layer 10 and the connection layer 20 and the display screen 30.

[0158] In some embodiments, the Young's modulus of the first portion 21 is greater than the Young's modulus of the second portion 22 .

[0159] Young's modulus is usually positively correlated with the structure's ability to resist deformation. Therefore, the Young's modulus of the first part 21 is greater than that of the second part 22, which indicates that the first part 21 has a greater ability to resist deformation than the second part 22. For the first part 21, the Young's modulus of the first part 21 at different positions may remain the same, or there may be differences. The Young's modulus of the first part 21 mentioned here refers to the average Young's modulus of the first part 21. Similarly, for the second part 22, the Young's modulus of the second part 22 at different positions may remain the same, or there may be differences. The Young's modulus of the second part 22 mentioned here refers to the average Young's modulus of the second part 22.

[0160] In the embodiment of the present application, the first part 21 is not easily deformed due to its large Young's modulus, while the second part 22 is more likely to deform due to its small Young's modulus. On this basis, when the composite support structure 100 is bent, the first part 21 will have a small deformation, while the second part 22 will have a large deformation. In this way, the bending requirements of the composite support structure 100 can be met by means of the large deformation of the second part 22, and the distance difference between the support sub-part 11 and the display screen 30 at different positions can be reduced by the small deformation of the first part 21, thereby reducing the problem of mold printing on the display device 200 and improving the use experience and reliability of the display device 200.

[0161] In some embodiments, the first portion 21 and the second portion 22 are made of different materials; or, the first portion 21 and the second portion 22 are made of the same material.

[0162] In the embodiment of the present application, the first part 21 and the second part 22 can both have a variety of material compositions. On this basis, the first part 21 and the second part 22 can be arranged to include different materials, so that the Young's modulus of the two can be different by virtue of the difference in material composition. Alternatively, the two can also include the same material, and by performing additional processing on the first part 21, the first part 21 can have a larger Young's modulus relative to the second part 22.

[0163] In some embodiments, the supporting sub-section 11 is an integral structure, and the first gap 12 is the area enclosed by the supporting sub-section 11; or, a plurality of supporting sub-sections 11 are provided, and when the composite supporting structure 100 is in a flattened state, the plurality of supporting sub-sections 11 are spaced apart along the first direction X, and the first gap 12 is located between two adjacent supporting sub-sections 11.

[0164] See also Figure 3 When the support sub-section 11 is an integrated structure, during the preparation of the support layer 10, a continuous support material layer can be formed first, and then the support material layer can be processed by laser etching, liquid etching or electroplating to form a support sub-section 11 with a hole structure, and the hole structure is the first gap 12.

[0165] When there are multiple supporting sub-sections 11, the multiple supporting sub-sections 11 are arranged at intervals in the first direction X, and the first direction X mentioned here refers to the direction intersecting with the thickness direction Z of the supporting layer 10 in the flattened state. Optionally, a single supporting sub-section 11 is a strip structure extending along the second direction Y, and in the flattened state, the first direction X, the second direction Y and the thickness direction Z are arranged perpendicularly in pairs. Further, in this case, the first gap 12 is located between two adjacent supporting sub-sections 11.

[0166] In the embodiment of the present application, the supporting layer 10 can adopt a variety of structural forms, and the connecting layer 20 can be adaptively adjusted according to different forms of the supporting layer 10, so that the connecting layer 20 can include a first part 21 connected to the supporting sub-part 11 and a second part 22 at least partially located in the first gap 12. This design has strong flexibility and versatility.

[0167] In some embodiments, Figure 1As shown, the first portion 21 includes a first sub-portion 211 disposed on one side of the support sub-portion 11, and the projection of the first sub-portion 211 in the thickness direction Z of the composite support structure 100 at least covers the projection of the support sub-portion 11 in the thickness direction Z of the composite support structure 100. The thickness direction Z of the composite support structure 100 is the same as the thickness direction Z of the support layer 10. For ease of understanding, Figure 1 The two thickness directions Z are indicated as being in the same direction.

[0168] The first sub-section 211 is a partial structure of the first section 21 located on one side of the support layer 10 along the thickness direction Z. The projection of the first sub-section 211 in the thickness direction Z refers to: on any plane perpendicular to the thickness direction Z, the corresponding orthographic projection of the first sub-section 211 on the plane. The projection of the support sub-section 11 in the thickness direction Z is similar to the projection of the support sub-section 11, and will not be described in detail in the embodiment of the present application.

[0169] The projection of the first sub-section 211 in the thickness direction Z at least covers the projection of the supporting sub-section 11 in the thickness direction Z. Depending on actual needs, the projection of the first sub-section 211 in the thickness direction Z can be set to coincide with the projection of the supporting sub-section 11 in the thickness direction Z, or the projection of the first sub-section 211 in the thickness direction Z can also cover and exceed the projection of the supporting sub-section 11 in the thickness direction Z.

[0170] In the embodiment of the present application, in the display device 200 finally formed, the first sub-portion 211 is a structure sandwiched between the display screen 30 and the support layer 10 in the connection layer 20. In other words, the first sub-portion 211 is a main structure for achieving relative fixation between the support layer 10 and the display screen 30. On this basis, by setting the projection of the first sub-portion 211 in the thickness direction Z to at least cover the projection of the support sub-portion 11 in the thickness direction Z, the contact area between the first sub-portion 211 and the support sub-portion 11 can be increased, so that the support reliability between the support layer 10 and the display screen 30 can be enhanced.

[0171] In some embodiments, the Young's modulus of the first sub-portion 211 is greater than the Young's modulus of the second sub-portion 22 .

[0172] In the embodiment of the present application, considering that in the thickness direction Z, the first sub-portion 211 is arranged corresponding to the support sub-portion 11, and the second portion 22 is arranged corresponding to the first gap 12, and during the bending process of the composite support structure 100, the support sub-portion 11 tends to have a smaller deformation amount, while the first gap 12 tends to have a larger deformation amount. Therefore, the Young's modulus of the first sub-portion 211 is set to be greater than the Young's modulus of the second portion 22, so that during the bending process of the composite support structure 100, the first sub-portion 211 can have a smaller deformation amount like the support sub-portion 11, and the second portion 22 can have a larger deformation amount like the first gap 12, so as to meet the bending requirements of the composite support structure 100.

[0173] Furthermore, since the first sub-section 211 itself has a smaller deformation amount, the partial structure of the first sub-section 211 close to the first gap 12 is not easy to move into the first gap 12, thereby improving the thickness consistency of the first sub-section 211 during the bending process of the composite support structure 100, reducing the risk of direct contact between the display screen 30 and the supporting sub-section 11 at a local position, reducing the mold printing problem of the display device 200, and improving the viewing experience and reliability.

[0174] In some embodiments, see Figure 4 , a projection of the first sub-portion 211 in the thickness direction Z of the composite support structure 100 overlaps with a projection of the first gap 12 in the thickness direction Z of the composite support structure 100 .

[0175] In the embodiment of the present application, the first sub-portion 211 is not completely arranged corresponding to the supporting sub-portion 11. The projection of the first sub-portion 211 in the thickness direction Z can cover and exceed the projection of the supporting sub-portion 11 in the thickness direction Z, so that the projection of the first sub-portion 211 can overlap with the projection of the first gap 12. This design helps to increase the projection area of ​​the first sub-portion 211 in the thickness direction Z, thereby increasing the contact area between it and the display screen 30, and improving the fixing reliability between the supporting layer 10 and the display screen 30.

[0176] In some embodiments, see Figure 5 , the first sub-portion 211 at least partially covers the second portion 22. In other words, the projection of the first sub-portion 211 in the thickness direction Z overlaps with the projection of the second portion 22 in the thickness direction Z.

[0177] In the embodiment of the present application, since the first sub-portion 211 at least partially covers the second portion 22, the surface of the first sub-portion 211 on one side facing the supporting layer 10 can be simultaneously arranged to be in contact with the second portion 22 and the supporting sub-portion 11, so that the existence of the first sub-portion 211 can also serve to improve the reliability of the relative position between the second portion 22 and the supporting layer 10.

[0178] In some optional embodiments, the first sub-portion 211 covers the entire second portion 22 . The first sub-portion 211 may be a continuous planar structure, which can be fitted and connected with the supporting sub-portion 11 and the entire second portion 22 , thereby improving the overall reliability of the composite support structure 100 .

[0179] In some optional embodiments, such as Figure 5 As shown, the second part 22 is arranged in a fit with the side wall of the corresponding supporting sub-part 11. The side wall of the corresponding supporting sub-part 11 mentioned here refers to: for the second part 22 located in the specific first gap 12, it is used to limit the side wall of the supporting sub-part 11 that forms the first gap 12.

[0180] In the embodiment of the present application, the second part 22 can be selected to be directly fitted with the side wall of the supporting sub-part 11, so that the first gap 12 can be filled with only the second part 22, which helps to increase the size of the second part 22 and improve the bending performance of the composite support structure 100. At the same time, the contact between the second part 22 and the supporting sub-part 11 also helps to improve the connection reliability between the two.

[0181] Or in other embodiments, see Figure 6 The first portion 21 further includes a second sub-portion 212 connected to the first sub-portion 211 and located in the first gap 12 , and the second sub-portion 212 is disposed in contact with the side wall of the corresponding supporting sub-portion 11 .

[0182] In the embodiment of the present application, in addition to the second part 22, the first gap 12 also includes a second sub-part 212 in the first part 21. The second sub-part 212 can separate the supporting sub-part 11 from the second part 22, and considering that the second sub-part 212 can have a larger Young's modulus than the second part 22, when the composite support structure 100 is bent, the second sub-part 212 will have a smaller deformation relative to the second part 22. This can alleviate the thinning trend of the connecting layer 20 at the corner side walls of the supporting sub-part 11, reduce the sharpness of the composite support structure 100 at the corner side walls of the supporting sub-part 11, reduce the degree of mold printing of the display device 200, and improve the appearance and reliability of use.

[0183] In some optional embodiments, such as Figure 5 As shown, the surface of the second portion 22 facing the first sub-portion 211 is flush with the surface of the supporting sub-portion 11 facing the first sub-portion 211 .

[0184] In the embodiment of the present application, the surface of the second portion 22 facing the first sub-portion 211 and the surface of the supporting sub-portion 11 facing the first sub-portion 211 can together form a complete plane, thereby simultaneously improving the tightness of the fit between the second portion 22 and the supporting sub-portion 11 relative to the first sub-portion 211, and helping to further improve the relative position reliability among the three.

[0185] In some embodiments, Figure 4 As shown, the first portion 21 includes a second sub-portion 212 connected to the first sub-portion 211 and located in the first gap 12, and the second sub-portion 212 is arranged in contact with the side wall of the corresponding supporting sub-portion 11. The second portion 22 is connected to the second sub-portion 212, and the Young's modulus of the second sub-portion 212 is greater than the Young's modulus of the second portion 22.

[0186] In the embodiment of the present application, a first sub-portion 211 having a larger Young's modulus is provided on the surface of the support sub-portion 11 facing the display screen 30, and a second sub-portion 212 having a larger Young's modulus is provided on the side wall of the support sub-portion 11 facing the first gap 12. The arrangement of the first sub-portion 211 and the second sub-portion 212 helps to reduce the degree of thinning corresponding to the partial structure of the connecting layer 20 close to the support sub-portion 11 when the composite support structure 100 is bent, reduce the sharpness of the composite support structure 100 at the angular side walls of the support sub-portion 11 and the risk of the support sub-portion 11 being exposed relative to the connecting layer 20, thereby reducing the degree of mold printing of the display device 200 and improving the viewing experience and reliability.

[0187] In addition, the second sub-section 212 is also used to connect with the supporting sub-section 11 and the second part 22 at the same time, so that while the bending requirements of the composite supporting structure 100 are met by means of the second part 22, the relative position reliability between the second part 22 and the supporting sub-section 11 can also be improved.

[0188] It should be noted that, for the first sub-section 211 and the second sub-section 212, the first sub-section 211 and the second sub-section 212 may have the same Young's modulus, or may have different Young's moduli, and may include the same material, or may include different materials, as long as the Young's modulus of the first sub-section 211 and the second sub-section 212 is greater than the Young's modulus of the second section 22. Optionally, the Young's modulus of the first sub-section 211 and the second sub-section 212 are the same.

[0189] Furthermore, in some optional embodiments, the first sub-portion 211 and the second sub-portion 212 are integrated, that is, they include the same material and are formed together in the same preparation process, which helps to reduce the preparation complexity of the connection layer 20 and improve the preparation efficiency.

[0190] In some embodiments, the first sub-portion 211 covers the second sub-portion 212, that is, the projection of the first sub-portion 211 in the thickness direction Z covers the projection of the second sub-portion 212 in the thickness direction Z. Under this design, the second sub-portion 212 can be in contact and connected with the first sub-portion 211 in addition to being in contact and connected with the supporting sub-portion 11 and the second portion 22, so as to further improve the relative position reliability of the second sub-portion 212.

[0191] In some optional embodiments, such as Figure 4 As shown, the second portion 22 is connected to the first sub-portion 211 and the second sub-portion 212 located on the same side. In other words, the second portion 22 is not completely located in the first gap 12, and it can be partially disposed beyond the first gap 12 in the thickness direction Z, and the partial structure of the second portion 22 located in the first gap 12 can be connected to the second sub-portion 212, and the partial structure of the second portion 22 beyond the first gap 12 can be connected to the first sub-portion 211.

[0192] In the embodiment of the present application, the second portion 22 can be partially located outside the first gap 12, thereby increasing the overall size of the second portion 22 and further meeting the bending performance requirements of the composite support structure 100. At the same time, the second portion 22 under this design can be connected to the first sub-portion 211 and the second sub-portion 212 at the same time, thereby improving the connection strength of the second sub-portion 212 relative to the first portion 21, thereby improving the overall structural reliability of the composite support structure 100.

[0193] In some optional embodiments, the surface of the first sub-portion 211 away from the supporting sub-portion 11 is flush with the surface of the second portion 22 away from the first gap 12. Figure 4 For example, the upper surface of the first sub-portion 211 and the upper surface of the second portion 22 can be located in the same plane.

[0194] In the embodiment of the present application, the surface of the first sub-portion 211 away from the supporting sub-portion 11 and the surface of the second portion 22 away from the first gap 12 are both surfaces used for fitting and contacting with the display screen 30. On this basis, by setting the two surfaces flush, the fitting tightness between the connecting layer 20 and the display screen 30 can be improved, thereby improving the connection reliability between the composite supporting structure 100 and the display screen 30.

[0195] In some embodiments, the first portion 21 and the second portion 22 include the same material, and the curing degree of the first portion 21 is greater than the curing degree of the second portion 22 .

[0196] The degree of solidification is an indicator of the degree to which a material changes from a liquid or plastic state to a solid or hardened state. In the embodiment of the present application, although the first part 21 and the second part 22 include the same material, since the corresponding degrees of solidification are different, the Young's modulus corresponding to the first part 21 and the second part 22 will also be different.

[0197] The specific material composition of the connection layer 20 is not limited in the present embodiment, as long as the connection layer 20 is transformed from a liquid or plastic state to a solid state. Optionally, the connection layer 20 includes at least one of a solid optical adhesive (Optically Clear Adhesive, OCA), a liquid optical adhesive (Optical Clear Resin, OCR), a thermoplastic polyurethane elastomer rubber (Thermoplastic Urethane, TPU) and a silicone rubber.

[0198] Further, in some optional embodiments, the first part 21 and the second part 22 are integrated, that is, before the curing process, the first part 21 and the second part 22 are formed together in the same process. In addition, the embodiment of the present application also does not limit the material composition of the support sub-part 11, as long as the support sub-part 11 itself has a large Young's modulus to meet the support effect of the display screen 30. Optionally, the support sub-part 11 includes stainless steel, titanium or carbon fiber. Among them, the Young's modulus of stainless steel is between 30KPa and 210GPa, for example, it can be 30KPa, 80KPa, 200KPa, 800KPa, 4MPa, 80MPa, 200MPa, 800MPa, 1GPa, 10GPa, 40GPa, 70GPa, 85GPa, 100GPa, 120GPa, 150GPa, 180GPa, 190GPa, or 210GPa, and the Young's modulus of titanium is between 100KPa and 113GPa, for example, it can be 100KPa, 450KPa, 805KPa, 1008KPa, 4MPa, 80MPa, 2 00MPa, 800MPa, 1GPa, 10GPa, 40GPa, 70GPa, 85GPa, 100GPa, 110GPa, 111GPa, 112GPa or 113GPa, etc.; the Young's modulus of carbon fiber is between 200KPa and 141GPa; for example, it can be 200KPa, 450KPa, 805KPa, 1008KPa, 4MPa, 80MPa, 200MPa, 800MPa, 1GPa, 10GPa, 40GPa, 70GPa, 85GPa, 100GPa, 110GPa, 125GPa, 132GPa or 141GPa, etc.

[0199] It should be noted that, during the formation of the connection layer 20, the preparation can be achieved through a variety of curing methods, for example, the connection layer 20 can be cured by optical curing, resin curing, thermal curing, chemical curing, etc. Taking optical curing as an example, the curing degree of the first part 21 can be greater than the curing degree of the second part 22 by adjusting the light intensity or power.

[0200] Alternatively, in some other embodiments, both the first part 21 and the second part 22 include a photoinitiator, and the concentration of the photoinitiator in the first part 21 is greater than the concentration of the photoinitiator in the second part 22 .

[0201] Photoinitiators, also known as photosensitizers or photocuring agents, are compounds that can absorb energy of a certain wavelength in the ultraviolet or visible light region to generate free radicals, cations, etc., thereby initiating polymerization, cross-linking, and curing of monomers. Photoinitiators are an important component of the optical curing process. On this basis, the embodiment of the present application sets the concentration of the photoinitiator in the first part 21 to be greater than the concentration of the photoinitiator in the second part 22, which also helps to make the curing degree of the first part 21 greater than the curing degree of the second part 22, thereby improving the reliability of the subsequent display device 200.

[0202] The embodiment of the present application does not limit the type of photoinitiator. Optionally, the photoinitiator may include at least one of 1173 photoinitiator, 184 photoinitiator, TPO photoinitiator, 2959 photoinitiator and 189 photoinitiator.

[0203] In some embodiments, the Young's modulus E1 of the first portion 21 and the Young's modulus E2 of the second portion 22 satisfy: E1 ≥ 3E2.

[0204] In the embodiment of the present application, by setting the Young's modulus E1 of the first part 21 to be not less than three times the Young's modulus E2 of the second part 22, the thickness consistency of the first sub-part 211 during the bending process of the composite support structure 100 can be further improved, the risk of direct contact between the display screen 30 and the supporting sub-part 11 at a local position can be reduced, the mold printing problem of the display device 200 can be reduced, and the viewing experience and reliability can be improved.

[0205] Next, the embodiment of the present application will further limit the Young's modulus range of the first part 21 and the second part 22 for the connection layer 20 under different material conditions. Optionally, the first part 21 and the second part 22 both include liquid optical adhesive, and E1 and E2 satisfy: 15KPa≤E1≤87KPa, 5KPa≤E2≤20KPa; for example, E1 is 15KPa, 25KPa, 45KPa, 50KPa, 65KPa, 70KPa, 75KPa, 85KPa or 87KPa, and E2 is 5KPa, 8KPa, 9KPa, 10KPa, 13KPa, 15KPa, 17KPa, 18KPa or 20KPa, etc. Alternatively, the first part 21 and the second part 22 both include thermoplastic polyurethane elastomer rubber, and E1 and E2 satisfy: 100MPa≤E1≤800MPa, 10MPa≤E2≤300MPa; for example, E1 is 100MPa, 150MPa, 200MPa, 350MPa, 450MPa, 500MPa, 600MPa, 700MPa or 800MPa, and E2 is 10MPa, 15MPa, 40MPa, 50MPa, 75MPa, 100MPa, 150MPa, 170MPa, 200MPa, 230MPa, 250MPa or 300MPa, etc. Alternatively, the first part 21 and the second part 22 both include silica gel, and E1 and E2 satisfy: 15MPa≤E1≤30MPa, 5MPa≤E2≤10MPa. For example, E1 is 15 MPa, 17 MPa, 18 MPa, 20 MPa, 22 MPa, 24 MPa, 26 MPa, 27 MPa or 30 MPa, and E2 is 5 MPa, 6 MPa, 7 MPa, 7.5 MPa, 8 MPa, 8.3 MPa, 9 MPa, 9.4 MPa, 9.8 MPa or 10 MPa, etc.

[0206] In some embodiments, see Figure 7 The second portion 22 is provided with at least one groove 221 , and the groove 221 is formed by a surface depression on the same side of the second portion 22 and the supporting sub-portion 11 .

[0207] The supporting sub-portion 11 has two opposite surfaces in the thickness direction Z, one of which is disposed toward the display screen 30, and the other is disposed away from the display screen 30. As for the second portion 22, the second portion 22 also has two opposite surfaces in the thickness direction Z, one of which is disposed toward the display screen 30, and the other is disposed away from the display screen 30. On this basis, the groove 221 can be formed by a depression on the surface of the second portion 22 away from the display screen 30. In other embodiments, it can also be formed by a depression on the surface of the second portion 22 away from the display screen 30.

[0208] In the embodiment of the present application, the second part 22 is provided with a groove 221, and the existence of the groove 221 makes it easier for the second part 22 to deform at the location of the groove 221, thereby improving the deformation performance of the second part 22 and further meeting the bending requirements of the composite support structure 100. Among them, the groove 221 may be provided with other liquid or solid structures, or may not be filled with other liquid or solid structures, as long as the Young's modulus of the second part 22 is less than the Young's modulus of the first part 21 to meet the deformation requirements of the second part 22.

[0209] In some embodiments, in the thickness direction Z of the composite support structure 100, the depth of the groove 221 is less than the thickness of the second part 22. In other words, the groove 221 is not a through-groove structure, and the second part 22 is not divided into multiple independent structures by the groove 221. The second part 22 can still maintain the continuity and integrity of its own structure, thereby improving the structural reliability of the second part 22.

[0210] In some embodiments, Figure 4 As shown, the first portion 21 includes a first sub-portion 211 disposed on one side of the supporting sub-portion 11 , the thickness of the supporting sub-portion 11 is h1 , the minimum thickness of the first sub-portion 211 is h2 , and h1 and h2 satisfy: h2 ≥ 1 / 2h1 .

[0211] It should be noted that, considering factors such as manufacturing accuracy and some other special designs, the thickness of the first sub-section 211 at different positions may be different, or may remain the same. When the thickness of the first sub-section 211 at different positions remains the same, the minimum thickness h2 of the first sub-section 211 is the average thickness of the first sub-section 211. When the thickness of the first sub-section 211 at different positions is different, the minimum thickness h2 of the first sub-section 211 is the thickness dimension of the first sub-section 211 at the position where the thickness is the smallest.

[0212] In addition, the minimum thickness h2 of the first sub-portion 211 mentioned here may be the minimum thickness of the first sub-portion 211 when the composite support structure 100 is in a bent state, or may be the minimum thickness of the first sub-portion 211 when the composite support structure 100 is in a flat state.

[0213] In the embodiment of the present application, by setting the minimum thickness h2 of the first sub-portion 211 to be no less than half of the thickness h1 of the supporting sub-portion 11, the first sub-portion 211 itself can have a larger thickness dimension. On this basis, even if part of the structure in the first sub-portion 211 moves with the bending of the composite supporting structure 100, due to the originally larger thickness dimension of the first sub-portion 211, it is not easy for the supporting sub-portion 11 to directly contact the display screen 30 in the display device 200, thereby further improving the reliability of the display device 200.

[0214] In some optional embodiments, h1≥h2, which is beneficial for making the first sub-portion 211 have a larger thickness dimension, thereby further reducing the direct contact between the supporting sub-portion 11 and the display screen 30, thereby further improving the reliability of the display device 200.

[0215] The specific numerical range of h1 is not limited in the present embodiment. Optionally, 50 μm ≤ h1 ≤ 200 μm. Exemplarily, h1 is 50 μm, 75 μm, 100 μm, 150 μm or 200 μm, etc.

[0216] In some embodiments, see Figure 8 The supporting sub-section 11 includes a second curved surface 112 facing the first sub-section 211, and the second curved surface 112 is protruded in the direction of the first sub-section 211. The minimum thickness h2 of the first sub-section 211 is the minimum distance between the second curved surface 112 and the first sub-section 211 on the side away from the supporting sub-section 11 in the thickness direction Z of the composite supporting structure 100.

[0217] Depending on actual needs, the surface of the supporting sub-section 11 facing the first sub-section 211 may not be a planar structure, and may include a second curved surface protruding toward the first sub-section 211. On this basis, the minimum thickness h2 of the first sub-section 211 can be the distance between the position of the highest protrusion height on the second curved surface 112 and the surface of the first sub-section 211 facing away from the supporting sub-section 11.

[0218] It should be noted that, depending on actual needs, the surface of the first sub-section 211 facing away from the supporting sub-section 11 may include a planar structure, or may include a curved surface or other structures. Similarly, the surface of the supporting sub-section 11 facing away from the first sub-section 211 may also include a planar structure, or may include a curved surface or other structures. The embodiments of the present application do not limit this.

[0219] In some embodiments, Figure 8 As shown, the supporting sub-portion 11 includes a first surface 113 away from the first portion 21 , the first surface 113 includes a first arcuate surface 111 , and a plurality of first arcuate surfaces 111 and a plurality of first intervals are alternately arranged in the first direction X. The first arcuate surface 111 protrudes toward the first portion 21 .

[0220] In the related art, the support member will bend and deform relative to the roller. Since the surface of the support member facing the roller is usually a flat structure, while the outer surface of the roller is a curved structure, the two cannot fit completely together, causing the gap space defined by the support member to be expanded, which in turn leads to the generation of molding problems.

[0221] In view of this, the embodiment of the present application considers that the first surface 113 is the surface of the support sub-part 11 for fitting with the reel 40, so the morphology of the first surface 113 is adjusted. The first surface 113 is not a planar structure, but includes a first curved surface 111, and the first curved surface 111 is protruded toward the first part 21, so that the first curved surface 111 can better fit the outer surface of the reel 40, so that the two are no longer in point contact or line contact, but in surface contact. In this way, the tightness of the fit between the two during the curling process is improved, the risk of the first gap 12 being enlarged is reduced, and it helps to further alleviate the mold printing problem.

[0222] It should be noted that there are multiple first curved surfaces 111, and the multiple first curved surfaces 111 and the multiple first gaps 12 are alternately arranged in the first direction X. On this basis, not all first curved surfaces 111 will be arranged in contact with the scroll 40. Specifically, in the display device 200 and when the composite support structure 100 is in a flattened state, part of the first curved surfaces 111 close to the scroll 40 along the first direction X can be in contact with the scroll 40 in the subsequent curling process, and for other first curved surfaces 111, when curling, other first curved surfaces 111 will be spaced from the surface of the scroll 40 in the radial direction of the scroll 40, but these first curved surfaces 111 can be arranged corresponding to the surface of the display screen 30 away from the composite support structure 100, and the arc design can meet the adaptability of these first curved surfaces 111 to the corresponding curling shape of the display device 200, which also helps to improve the reliability of the display device 200. Further optionally, a buffer layer may be provided on the portion of the first curved surface 111 that is not disposed in contact with the reel 40 , so as to reduce scratches on the surface of the display screen 30 .

[0223] In some embodiments, the supporting sub-portion 11 further includes a second surface 114 facing the first portion 21 , the second surface 114 includes a second arc-shaped surface 112 , and the second arc-shaped surface 112 is protruded toward the first portion 21 .

[0224] The first surface 113 and the second surface 114 are two opposite surfaces of the support sub-portion 11 in the thickness direction Z. Similar to the first surface 113, the second surface 114 also includes a second curved surface 112 and is also protruded toward the first portion 21. In this way, the two opposite surfaces of the support sub-portion 11 can be adapted to the morphology of the display device 200 after being rolled, thereby further improving the rolling effect and reliability of the display device 200.

[0225] In some embodiments, the Young's modulus of the supporting sub-portion 11 is greater than that of the first portion 21; and / or, the Young's modulus of the supporting sub-portion 11 is greater than that of the second portion 22, that is, the supporting sub-portion 11 has a stronger ability to resist deformation relative to at least one of the first portion 21 and the second portion 22, thereby improving its support reliability for the display screen 30 and improving the service life of the display device 200.

[0226] Second, as Figure 4 As shown, the embodiment of the present application provides a composite support structure 100, the composite support structure 100 includes a support layer 10 and a connection layer 20, the support layer 10 includes a support sub-section 11, the support sub-section 11 forms a plurality of first gaps 12, and the plurality of first gaps 12 are arranged at intervals. The connection portion includes a first sub-section 211 arranged on one side of the support sub-section 11, and the projection of the first sub-section 211 in the thickness direction Z of the composite support structure 100 at least covers the projection of the support sub-section 11 in the thickness direction Z of the composite support structure 100. Among them, the thickness of the support sub-section 11 is h1, the minimum thickness of the first sub-section 211 is h2, and h1 and h2 satisfy: h2 ≥ 1 / 2h1.

[0227] The composite support structure 100 is a structure used in the display device 200 and used to support the display screen 30. The composite support structure 100 includes at least a support layer 10 and a connecting layer 20. The support layer 10 is the main part of the composite support structure 100 for supporting, and the connecting layer 20 is the main part of the composite support structure 100 for connecting the display screen 30.

[0228] It should be noted that, in order to meet the deformation requirements of the display device 200 formed later, the composite support structure 100 itself can be relatively bent, so as to meet the curling deformation requirements of the display device 200. In other words, the composite support structure 100 itself has at least a flat state and a bent state. In the flat state, the composite support structure 100 is in a straight state, and in the bent state, the composite support structure 100 is in a bent state. For ease of understanding, unless otherwise specified in the following description of this application, the composite support structure 100 is described in the flat state.

[0229] The support layer 10 includes a support sub-portion 11, and the first gap 12 is a cavity structure defined by the support sub-portion 11. The support sub-portion 11 can have various forms, for example, the support sub-portion 11 can be in a strip-shaped structure and multiple support sub-portions 11 are provided, and multiple support sub-portions 11 are arranged at intervals and the first gap 12 is formed between adjacent support sub-portions 11, or the support sub-portion 11 can also be in a planar structure, and multiple hole structures are provided on the planar structure, and the hole structures are the first gaps 12.

[0230] There are multiple first gaps 12, and the multiple first gaps 12 can be spaced apart only along a single direction, or can be arranged in an array along multiple directions at the same time, or can be spaced apart in other regular or irregular arrangements, which is not limited in this embodiment of the present application.

[0231] The first sub-portion 211 is a partial structure of the connection layer 20 located on one side of the support layer 10 along the thickness direction Z. The projection of the first sub-portion 211 in the thickness direction Z refers to: on any plane perpendicular to the thickness direction Z, the corresponding orthographic projection of the first sub-portion 211 on the plane. The projection of the support sub-portion 11 in the thickness direction Z is similar to the projection of the support sub-portion 11, and will not be described in detail in the embodiment of the present application.

[0232] The projection of the first sub-section 211 in the thickness direction Z at least covers the projection of the supporting sub-section 11 in the thickness direction Z. Depending on actual needs, the projection of the first sub-section 211 in the thickness direction Z can be set to coincide with the projection of the supporting sub-section 11 in the thickness direction Z, or the projection of the first sub-section 211 in the thickness direction Z can also cover and exceed the projection of the supporting sub-section 11 in the thickness direction Z.

[0233] It should be noted that, considering factors such as manufacturing accuracy and some other special designs, the thickness of the first sub-section 211 at different positions may be different, or may remain the same. When the thickness of the first sub-section 211 at different positions remains the same, the minimum thickness h2 of the first sub-section 211 is the average thickness of the first sub-section 211. When the thickness of the first sub-section 211 at different positions is different, the minimum thickness h2 of the first sub-section 211 is the thickness dimension of the first sub-section 211 at the position where the thickness is the smallest.

[0234] In addition, the minimum thickness h2 of the first sub-portion 211 mentioned here may be the minimum thickness of the first sub-portion 211 when the composite support structure 100 is in a bent state, or may be the minimum thickness of the first sub-portion 211 when the composite support structure 100 is in a flat state.

[0235] In the embodiment of the present application, by setting the minimum thickness h2 of the first sub-portion 211 to be no less than half of the thickness h1 of the supporting sub-portion 11, the first sub-portion 211 itself can have a larger thickness dimension. On this basis, even if part of the structure in the first sub-portion 211 moves with the bending of the composite supporting structure 100, due to the originally larger thickness dimension of the first sub-portion 211, it is not easy for the supporting sub-portion 11 to directly contact the display screen 30 in the display device 200, thereby alleviating the mold printing problem and improving the viewing experience and reliability of the display device 200.

[0236] In some optional embodiments, h1≥h2, which is beneficial for making the first sub-portion 211 have a larger thickness dimension, thereby further reducing the direct contact between the supporting sub-portion 11 and the display screen 30, thereby further improving the reliability of the display device 200.

[0237] The specific numerical range of h1 is not limited in the present embodiment. Optionally, 50 μm ≤ h1 ≤ 200 μm. Exemplarily, h1 is 50 μm, 75 μm, 100 μm, 150 μm or 200 μm, etc.

[0238] In some embodiments, Figure 8 As shown, the supporting sub-portion 11 includes a second curved surface 112 facing the first sub-portion 211, and the second curved surface 112 is protruded in the direction of the first sub-portion 211. The minimum thickness h2 of the first sub-portion 211 is the minimum distance between the second curved surface 112 and the first sub-portion 211 on the side away from the supporting sub-portion 11 in the thickness direction Z of the composite supporting structure 100.

[0239] Depending on actual needs, the surface of the supporting sub-section 11 facing the first sub-section 211 may not be a planar structure, and may include a second curved surface protruding toward the first sub-section 211. On this basis, the minimum thickness h2 of the first sub-section 211 can be the distance between the position of the highest protrusion height on the second curved surface 112 and the surface of the first sub-section 211 facing away from the supporting sub-section 11.

[0240] It should be noted that, depending on actual needs, the surface of the first sub-section 211 facing away from the supporting sub-section 11 may include a planar structure, or may include a curved surface or other structures. Similarly, the surface of the supporting sub-section 11 facing away from the first sub-section 211 may also include a planar structure, or may include a curved surface or other structures. The embodiments of the present application do not limit this.

[0241] In some embodiments, the connection layer 20 further includes a second portion 22 at least partially located in the first gap 12 , and the Young's modulus of the first sub-portion 211 is greater than that of the second portion 22 .

[0242] The second portion 22 is at least partially located in the first gap 12, and the second portion 22 can have a variety of positional relationships relative to the first gap 12, for example, the second portion 22 can be completely located in the first gap 12, or the second portion 22 can also be partially located in the first gap 12, and partially exceeds at least one opening of the first gap 12 in the thickness direction Z of the support layer 10. According to different actual needs, the second portion 22 can be arranged in close contact with the support sub-portion 11, or the second portion 22 can be arranged at a distance from the support sub-portion 11.

[0243] In the embodiment of the present application, considering that in the thickness direction Z, the first sub-portion 211 is arranged corresponding to the support sub-portion 11, and the second portion 22 is arranged corresponding to the first gap 12, and during the bending process of the composite support structure 100, the support sub-portion 11 tends to have a smaller deformation amount, while the first gap 12 tends to have a larger deformation amount. Therefore, the Young's modulus of the first sub-portion 211 is set to be greater than the Young's modulus of the second portion 22, so that during the bending process of the composite support structure 100, the first sub-portion 211 can have a smaller deformation amount like the support sub-portion 11, and the second portion 22 can have a larger deformation amount like the first gap 12, so as to meet the bending requirements of the composite support structure 100.

[0244] Furthermore, since the first sub-section 211 itself has a smaller deformation amount, the partial structure of the first sub-section 211 close to the first gap 12 is not easy to move into the first gap 12, thereby improving the thickness consistency of the first sub-section 211 during the bending process of the composite support structure 100, reducing the risk of direct contact between the display screen 30 and the supporting sub-section 11 at a local position, reducing the mold printing problem of the display device 200, and improving the viewing experience and reliability.

[0245] In some embodiments, a projection of the first sub-portion 211 in the thickness direction Z of the composite support structure 100 overlaps with a projection of the first gap 12 in the thickness direction Z of the composite support structure 100 .

[0246] In the embodiment of the present application, the first sub-portion 211 is not completely arranged corresponding to the supporting sub-portion 11. The projection of the first sub-portion 211 in the thickness direction Z can cover and exceed the projection of the supporting sub-portion 11 in the thickness direction Z, so that the projection of the first sub-portion 211 can overlap with the projection of the first gap 12. This design helps to increase the projection area of ​​the first sub-portion 211 in the thickness direction Z, thereby increasing the contact area between it and the display screen 30, and improving the fixing reliability between the supporting layer 10 and the display screen 30.

[0247] In some embodiments, the first sub-portion 211 at least partially covers the second portion 22. In other words, the projection of the first sub-portion 211 in the thickness direction Z overlaps with the projection of the second portion 22 in the thickness direction Z.

[0248] In the embodiment of the present application, since the first sub-portion 211 at least partially covers the second portion 22, the surface of the first sub-portion 211 facing the supporting layer 10 can be simultaneously bonded to the second portion 22 and the supporting layer 10, so that the existence of the first sub-portion 211 can also serve to improve the reliability of the relative position between the second portion 22 and the supporting layer 10.

[0249] In some optional embodiments, the first sub-portion 211 covers the entire second portion 22 . The first sub-portion 211 may be a continuous planar structure, which can be fitted and connected with the supporting sub-portion 11 and the entire second portion 22 , thereby improving the overall reliability of the composite support structure 100 .

[0250] In some optional embodiments, the second part 22 is arranged to fit together with the side wall of the corresponding supporting sub-part 11. The side wall of the corresponding supporting sub-part 11 mentioned here refers to: for the second part 22 located in a specific first gap 12, it is used to limit the side wall of the supporting sub-part 11 that forms the first gap 12.

[0251] In the embodiment of the present application, the second part 22 can be selected to be directly fitted with the side wall of the supporting sub-part 11, so that the first gap 12 can be filled with only the second part 22, which helps to increase the size of the second part 22 and improve the bending performance of the composite support structure 100. At the same time, the contact between the second part 22 and the supporting sub-part 11 also helps to improve the connection reliability between the two.

[0252] In some optional embodiments, a surface of the second portion 22 facing the first sub-portion 211 is flush with a surface of the supporting sub-portion 11 facing the first sub-portion 211 .

[0253] In the embodiment of the present application, the surface of the second portion 22 facing the first sub-portion 211 and the surface of the supporting sub-portion 11 facing the first sub-portion 211 can together form a complete plane, thereby simultaneously improving the tightness of the fit between the second portion 22 and the supporting sub-portion 11 relative to the first sub-portion 211, and helping to further improve the relative position reliability among the three.

[0254] In some embodiments, the connection layer 20 further includes a second sub-portion 212 connected to the first sub-portion 211 and located in the first gap 12, and the second sub-portion 212 is disposed in contact with the side wall of the corresponding supporting sub-portion 11. The second portion 22 is connected to the second sub-portion 212, and the Young's modulus of the second sub-portion 212 is greater than the Young's modulus of the second portion 22.

[0255] In the embodiment of the present application, a first sub-portion 211 having a larger Young's modulus is provided on the surface of the support sub-portion 11 facing the display screen 30, and a second sub-portion 212 having a larger Young's modulus is provided on the side wall of the support sub-portion 11 facing the first gap 12. The arrangement of the first sub-portion 211 and the second sub-portion 212 helps to reduce the degree of thinning corresponding to the partial structure of the connecting layer 20 close to the support sub-portion 11 when the composite support structure 100 is bent, reduce the sharpness of the composite support structure 100 at the angular side walls of the support sub-portion 11 and the risk of the support sub-portion 11 being exposed relative to the connecting layer 20, thereby reducing the degree of mold printing of the display device 200 and improving the viewing experience and reliability.

[0256] In addition, the second sub-portion 212 is also used to connect with the supporting sub-portion 11 and the second portion 22 at the same time, so that the second portion 22 can meet the bending requirements of the composite supporting structure 100 while improving the relative position reliability between the second portion 22 and the supporting sub-portion 11.

[0257] It should be noted that, for the first sub-section 211 and the second sub-section 212, the first sub-section 211 and the second sub-section 212 may have the same Young's modulus, or may have different Young's moduli, and may include the same material, or may include different materials, as long as the Young's modulus of the first sub-section 211 and the second sub-section 212 is greater than the Young's modulus of the second section 22. Optionally, the Young's modulus of the first sub-section 211 and the second sub-section 212 are the same.

[0258] Furthermore, in some optional embodiments, the first sub-portion 211 and the second sub-portion 212 are integrated, that is, they include the same material and are formed together in the same preparation process, which helps to reduce the preparation complexity of the connection layer 20 and improve the preparation efficiency.

[0259] In some embodiments, the first sub-portion 211 covers the second sub-portion 212, that is, the projection of the first sub-portion 211 in the thickness direction Z covers the projection of the second sub-portion 212 in the thickness direction Z. Under this design, the second sub-portion 212 can be in contact and connected with the first sub-portion 211 in addition to being in contact and connected with the supporting sub-portion 11 and the second portion 22, so as to further improve the relative position reliability of the second sub-portion 212.

[0260] In some embodiments, the first sub-portion 211 , the second sub-portion 212 , and the second portion 22 include the same material, and the curing degree of the first sub-portion 211 is greater than the curing degree of the second portion 22 .

[0261] The degree of solidification is an indicator of the degree to which a material changes from a liquid or plastic state to a solid or hardened state. In the embodiment of the present application, although the first sub-section 211 and the second section 22 include the same material, since the corresponding degrees of solidification are different, the Young's modulus corresponding to the first sub-section 211 and the second section 22 will also be different. For the first sub-section 211 and the second sub-section 212, the same solidification process can be used for both, so that the corresponding Young's modulus of the two remains the same.

[0262] The specific material composition of the connection layer 20 is not limited in the present embodiment, as long as the connection layer 20 is transformed from a liquid or plastic state to a solid state. Optionally, the connection layer 20 includes at least one of a solid optical adhesive (Optically Clear Adhesive, OCA), a liquid optical adhesive (Optical Clear Resin, OCR), a thermoplastic polyurethane elastomer rubber (Thermoplastic Urethane, TPU) and a silicone rubber.

[0263] In some optional embodiments, the second portion 22 is connected to the first sub-portion 211 and the second sub-portion 212 located on the same side. In other words, the second portion 22 is not completely located in the first gap 12, and it can be partially disposed beyond the first gap 12 in the thickness direction Z, and the partial structure of the second portion 22 located in the first gap 12 can be connected to the second sub-portion 212, and the partial structure of the second portion 22 beyond the first gap 12 can be connected to the first sub-portion 211.

[0264] In the embodiment of the present application, the second portion 22 can be partially located outside the first gap 12, thereby increasing the overall size of the second portion 22 and further meeting the bending performance requirements of the composite support structure 100. At the same time, the second portion 22 under this design can be connected to the first sub-portion 211 and the second sub-portion 212 at the same time, thereby improving the connection strength of the second sub-portion 212 relative to the first portion 21, thereby improving the overall structural reliability of the composite support structure 100.

[0265] In some optional embodiments, the surface of the first sub-portion 211 away from the supporting sub-portion 11 is flush with the surface of the second portion 22 away from the first gap 12. In conjunction with the drawings, the upper surface of the first sub-portion 211 and the upper surface of the second portion 22 can be located in the same plane.

[0266] In the embodiment of the present application, the surface of the first sub-portion 211 away from the supporting sub-portion 11 and the surface of the second portion 22 away from the first gap 12 are both surfaces used for fitting and contacting with the display screen 30. On this basis, by setting the two surfaces flush, the fitting tightness between the connecting layer 20 and the display screen 30 can be improved, thereby improving the connection reliability between the composite supporting structure 100 and the display screen 30.

[0267] Thirdly, Figure 2 As shown, an embodiment of the present application provides a display device 200, which includes a reel 40, a display screen 30 and a composite support structure 100 in any of the aforementioned embodiments, wherein the support layer 10 is arranged on the non-light-emitting side of the display screen 30, and the display screen 30 and the composite support structure 100 can be rolled up around the reel 40.

[0268] It should be noted that the display device 200 provided in the embodiment of the present application has the beneficial effects of the composite support structure 100 in any of the aforementioned embodiments. For details, please refer to the aforementioned description of the beneficial effects of the composite support structure 100, which will not be repeated in the embodiment of the present application.

[0269] In some embodiments, Figure 8 As shown, the supporting sub-portion 11 includes a first surface 113 facing away from the display screen 30 , the first surface 113 includes a first arcuate surface 111 , and a plurality of first arcuate surfaces 111 and a plurality of first gaps 12 are alternately arranged in the winding direction. The first arcuate surface 111 is protruded toward the display screen 30 .

[0270] In the related art, the support member will bend and deform relative to the roller. Since the surface of the support member facing the roller is usually a flat structure, while the outer surface of the roller is a curved structure, the two cannot fit completely together, causing the gap space defined by the support member to be expanded, which in turn leads to the generation of molding problems.

[0271] In view of this, the embodiment of the present application considers that the first surface 113 is the surface of the support sub-part 11 for fitting with the reel 40, so the morphology of the first surface 113 is adjusted. The first surface 113 is not a planar structure, but includes a first curved surface 111, and the first curved surface 111 is protruded toward the first part 21, so that the first curved surface 111 can better fit with the outer surface of the reel 40, so that the two are no longer in point contact or line contact, but in surface contact. In this way, the tightness of the fit between the two during the curling process is improved, the risk of the first gap 12 being enlarged is reduced, and it helps to further alleviate the mold printing problem.

[0272] It should be noted that there are multiple first curved surfaces 111, and the multiple first curved surfaces 111 and the multiple first gaps 12 are alternately arranged in the first direction X. On this basis, not all first curved surfaces 111 will be arranged in contact with the scroll 40. Specifically, in the display device 200 and when the composite support structure 100 is in a flattened state, part of the first curved surfaces 111 close to the scroll 40 along the first direction X can be in contact with the scroll 40 in the subsequent curling process, and for other first curved surfaces 111, when curling, other first curved surfaces 111 will be spaced from the surface of the scroll 40 in the radial direction of the scroll 40, but these first curved surfaces 111 can be arranged corresponding to the surface of the display screen 30 away from the composite support structure 100, and the arc design can meet the adaptability of these first curved surfaces 111 to the corresponding curling shape of the display device 200, which also helps to improve the reliability of the display device 200. Further optionally, a buffer layer may be provided on the portion of the first curved surface 111 that is not disposed in contact with the reel 40 , so as to reduce scratches on the surface of the display screen 30 .

[0273] In some optional embodiments, at least some of the first arc-shaped surfaces 111 have different radii.

[0274] The radius mentioned here refers to the radius of the corresponding arc structure for a specific first arc. It can be seen from the accompanying drawings that when the display device 200 is in a curled state, the radial distances between the first arc surface 111 at different turns and the center of the scroll 40 are not the same. On this basis, for different first arc surfaces 111, in order to better adapt the degree of fit between different first arc surfaces 111 and the corresponding fitted structures, the embodiment of the present application also sets the radius of at least part of the first arc surface 111 differently. For example, when the display device 200 is in a curled state, the farther from the center of the scroll 40 in the radial direction of the scroll 40, the larger the radius of the corresponding first arc surface 111. This can meet the surface contact requirements of different first arc surfaces 111 and improve the curling reliability of the display device 200.

[0275] Further, in some optional embodiments, see Figures 8 to 10 The display device 200 includes a first state and a second state. In the first state, the display screen 30 is in a straight state. In the second state, the display screen 30 is in a curved state and is wound around the reel 40. In the second state, the support layer 10 is arranged around the reel 40n times, and the radius of the first curved surface 111 is r, and r satisfies: r = R + (i-1) h3, wherein R is the radius of the reel 40, h3 is the total thickness of the display screen 30 and the composite support structure 100, i is the number of turns of the support layer 10 at the location of the first curved surface 111, and i is a positive integer not greater than n. In order to facilitate understanding, combined Figure 8 For example, Fig.10 Only the supporting sub-portion 11 and the second portion 22 are shown, while the first sub-portion 21 is not shown.

[0276] The display device 200 has at least a first state and a second state. The first state is the use state of the display device 200 , in which the display screen 30 is in a flat state. The second state is the storage and curling state of the display device 200 , in which the display screen 30 is in a bent state and is wound around the reel 40 .

[0277] In order to reduce the size of the display device 200 in the second state, the support layer 10 usually needs to be arranged around the reel 40 times. In other words, n is usually a positive integer greater than or equal to 2. On this basis, in combination with the accompanying drawings, the distance between the first curved surface 111 and the center of the scroll 40 in the radial direction of the scroll 40 is R+(i-1)h3. On this basis, the embodiment of the present application also sets the radius r of the first curved surface 111 to be equal to R+(i-1)h3, that is, the radius of the first curved surface 111 is equal to the distance between it and the center of the scroll 40 in the radial direction of the scroll 40. In this way, the radius size of the first curved surface 111 can correspond to its position, so that part of the first curved surface 111 can achieve surface contact with the outer surface of the scroll 40, and part of the first curved surface 111 can achieve surface contact with the surface of the display screen 30 away from the composite support structure 100, thereby improving the adaptability among the composite support structure 100, the display screen 30 and the scroll 40 in the second state, thereby reducing the risk of excessive movement of part of the structure of the connecting layer 20 in the composite support structure 100 and causing mold printing problems, thereby improving the appearance and reliability of the display device 200.

[0278] It should be noted that h3 is the total thickness of the display screen 30 and the composite support structure 100. The thickness of the display screen 30 here refers to the overall thickness of all film layer structures in the display screen 30. In addition to the array substrate and the light-emitting device layer, the display screen 30 may also include functional film layers such as a touch layer and a cover plate.

[0279] In addition, the embodiment of the present application considers that in the second state, part of the first curved surface 111 will be directly attached to the display screen 30. In other embodiments, a buffer layer will be provided on the first curved surface 111 to block the first curved surface 111 and the display screen 30, reducing the risk of scratching the display screen 30. In this case, h3 needs to be the total thickness of the display screen 30, the composite support structure 100 and the buffer layer.

[0280] In some embodiments, in the second state, the size of the first arcuate surface 111 located at the first circle in the winding direction is L1, and the size of the first arcuate surface 111 located at the i-th circle in the winding direction is Li, and L1 and Li satisfy: L1≤Li≤L1*(R+(i-1)h3) / R.

[0281] The size of the first curved surface 111 in the winding direction mentioned here refers to: the size of the first curved surface 111 in the circumferential direction of the scroll 40, wherein the size of the first curved surface 111 located at the first circle in the winding direction is L1, and for the first curved surface 111 at the i-th circle, its size in the winding direction is Li. On this basis, considering that the first circle is the circle closest to the scroll 40, the corresponding winding circumference of the composite support structure 100 at the first circle is the smallest, and the winding circumference at other circles will be larger than the winding circumference at the first circle, so by setting Li to not less than L1, the first curved surface 111 at other circles except the first circle can have a larger size, thereby improving its support effect on the display screen 30 in the first state and helping to reduce the difficulty of preparation.

[0282] As for the formula L1*(R+(i-1)h3) / R, it represents the size of the first curved surface 111 at the i-th circle when the curvature corresponding to the first curved surface 111 at the i-th circle is equal to the curvature corresponding to the first curved surface 111 at the first circle. On this basis, by setting Li to be no greater than L1*(R+(i-1)h3) / R, the risk of the display module being difficult to curl at a local position due to the excessive size of a single first curved surface 111 can be reduced, thereby achieving a balance between the composite support structure 100's need for bending deformation and its support for the display screen 30. Optionally, Li=L1*(R+(i-1)h3) / R.

[0283] Fourth, please refer to Fig.11 12 , the present application embodiment provides a method for preparing a composite support structure 100, comprising:

[0284] S100: providing a support material layer, and patterning the support material layer to form a support sub-part.

[0285] See also Fig.12a In step S100, the support sub-section 11 forms a plurality of first gaps 12 arranged at intervals. Optionally, the support material layer is a continuous whole surface structure, and the support material layer can be processed by laser etching, liquid etching or electroplating, so as to form a support sub-section 11 with a hole structure, and the hole structure is the first gap 12.

[0286] S110: forming an initial adhesive layer on one side of the supporting sub-part.

[0287] See also Figure 12b In step S110, the initial glue layer 20' is used to subsequently form the connection layer 20, and the initial glue layer 20' is partially located in the first gap 12 and covers the surface of the supporting sub-part 11. The initial glue layer 20' can have a variety of phase forms, for example, the initial glue layer 20' can be liquid or semi-solid and have fluidity, or the initial glue layer 20' can also be solid and have strong deformation ability.

[0288] S120: Processing the initial adhesive layer to form a connecting layer.

[0289] See also Fig.12c In step S120, the connection layer 20 includes a first portion 21 in contact with the supporting sub-portion 11, and a second portion 22 at least partially located in the first gap 12, and the first portion 21 and the second portion 22 have different Young's moduli. The initial adhesive layer 20' can have a variety of processing methods, for example, the initial adhesive layer 20' can be processed by drilling holes or grooves, and other material structures can be formed at the holes or grooves to form the first portion 21 and the second portion 22 with different Young's moduli.

[0290] In the embodiment of the present application, the connecting layer 20 is first formed on the supporting sub-portion 11 rather than on the display screen 30. In this way, the connecting layer 20 may include a second portion 22 at least partially located in the first gap 12. On this basis, by adjusting the Young's modulus of the first portion 21 and the second portion 22 to be different, the first portion 21 can be prevented from entering the first gap 12, thereby reducing the distance difference between the supporting sub-portion 11 and the display screen 30 at different positions, thereby reducing the problem of mold printing on the display device 200 and improving the appearance and reliability of the display device 200.

[0291] In some embodiments, see Fig.13 As shown in FIG14 , step S120 includes:

[0292] S121: forming a shielding layer on one side of the initial adhesive layer.

[0293] See also Fig.14a In step S121, the projection of the shielding layer 60 in the thickness direction Z of the supporting sub-portion 11 is located within the projection of the first gap 12 in the thickness direction Z of the supporting sub-portion 11. In other words, the shielding layer 60 is arranged corresponding to the first gap 12 to shield the partial structure of the initial glue layer 20' located in the first gap 12.

[0294] S122: curing the initial adhesive layer from the side of the shielding layer away from the initial adhesive layer.

[0295] See also Fig.14b In step S122, a first portion 21 and a second portion 22 can be formed through a curing treatment, wherein the region where the shielding layer 60 is located corresponds to the region where the second portion 22 is formed. In other words, relative to the first portion 21, since the second portion 22 is shielded, its corresponding degree of curing is often less than that of the first portion 21. Therefore, the Young's modulus of the first portion 21 can be greater than that of the second portion 22, and the second portion 22 can be deformed during the curling process of the display device 200 to meet the curling requirements.

[0296] Optionally, the curing process includes an optical curing process. In this case, since the first part 21 is not blocked by the shielding layer 60 in step S122, it can achieve a higher crosslinking density, forming a first part 21 with a large molecular weight and a large modulus. At the location of the second part 22, due to the shielding of the shielding layer 60, its molecular crosslinking ratio is low, so the second part 22 with a small molecular weight and a small modulus is formed.

[0297] Of course, in other embodiments, the shielding layer may not be provided. In this case, the concentration of the photocuring agent corresponding to different positions may be adjusted to be different, so that the curing degree of the initial adhesive layer 20' at different positions is different, thereby forming the first part 21 and the second part 22 with different Young's modulus.

[0298] In some embodiments, see Fig.15 , before step S121, it also includes:

[0299] S123: Pre-curing the initial adhesive layer.

[0300] In step S123, pre-curing is the first curing process of the initial glue layer 20', and the pre-curing process uses a light source with a first energy intensity W1 to optically cure the initial glue layer 20'. At this time, since there is no shielding layer, the structure of the initial glue layer 20' in each area can be pre-cured. This design can make the second part 22 formed in the end to be a solid structure to meet the actual needs of the display device 200.

[0301] In step S122, the initial adhesive layer 20' is optically cured using a light source with a second energy intensity W2, where W2>W1.

[0302] In the embodiment of the present application, due to the existence of the shielding layer, in step S122, the initial glue layer 20' is less affected by the curing at the location of the second portion 22 than by the curing at the location of the first portion 21. Furthermore, since the second energy intensity W2 is greater than the first energy intensity W1, the first portion 21 finally formed can have a greater Young's strength relative to the second portion 22, thereby achieving the difference in Young's modulus between the two without changing the materials of the two, reducing the manufacturing cost of the display device 200 and improving the reliability of the display device 200.

[0303] In some embodiments, see Fig.16 As shown in FIG. 17 , step S120 includes:

[0304] S124: curing the initial adhesive layer, and grooving the cured initial adhesive layer.

[0305] See also Fig.17a In step S124, after the slotting process, a first portion 21 and a receiving hole 21' located in the first portion 21 are formed. The receiving hole 21' may be set through the first portion 21, or may not be set through the first portion 21. Optionally, the receiving hole 21' is set through the first portion 21.

[0306] S125: Forming a second portion in the receiving hole.

[0307] See also Fig.17b In step S125, the first part 21 and the second part 22 include different materials, and the Young's modulus of the first part 21 is greater than the Young's modulus of the second part 22. This design can make the first part 21 and the second part 22 have more material selectivity, thereby improving the manufacturing flexibility.

[0308] In some embodiments, see Fig.18 In step S100, a support material layer 10' is formed on a substrate 50. The substrate 50 is a temporary substrate for placing the support material layer 10'. The existence of the substrate 50 can satisfy the support effect during the subsequent processing of the support material layer 10' and the initial glue layer 20'.

[0309] See also Fig.19 After step S120 , the method further includes: S130 : separating the supporting sub-portion 11 from the base 50 .

[0310] In step S130 , when the composite support structure 100 is prepared and needs to be attached to the display screen 30 , the support sub-portion 11 can be separated from the substrate 50 to reduce the influence of the substrate 50 on the thickness of the display device 200 .

[0311] In the embodiment of the present application, the presence of the substrate 50 can make the support layer 10 and the connecting layer 20 independent of the display screen 30 during the formation process, so that the composite support structure 100 including the support layer 10 and the connecting layer 20 can be formed separately first, and then it can be bonded to the display screen 30, so as to reduce the influence of the display screen 30 on the structure of the support layer 10 and the connecting layer 20, so that the connecting layer 20 can include a first part 21 and a second part 22 with different Young's modulus, so as to improve the viewing experience and reliability of the display device 200.

[0312] Fifth, please refer to Fig. 20 21 , the present application embodiment provides a method for preparing a composite support structure 100, comprising:

[0313] S210: providing an initial adhesive layer, curing the initial adhesive layer, and grooving the cured initial adhesive layer.

[0314] See also Fig.21a In step S210, a connection layer 20 may be formed first, and the connection layer 20 may have a plurality of spaced accommodation portions 22'. The accommodation portions 22' may be hole-shaped or groove-shaped structures, and are used for subsequent corresponding arrangement with the supporting sub-portions 11 of the supporting layer 10.

[0315] S220: providing a support material layer, and performing patterning on the support material layer.

[0316] See also Figure 21b In step S220, a support layer 10 may be formed by patterning, and the support layer 10 includes support sub-parts 11 arranged at intervals. The patterning may include processing the support material layer by laser etching, chemical etching or electroplating.

[0317] S230: Dispose the supporting sub-part in the corresponding receiving part.

[0318] See also Fig.21c In step S230, a composite support structure may be formed, wherein the connection portion includes a first portion 21 in contact with the support sub-portion 11, and a second portion 22 at least partially located between adjacent support sub-portions 11, and the Young's modulus of the first portion 21 is different from that of the second portion 22.

[0319] In the embodiment of the present application, the connecting layer 20 is not formed directly on the supporting layer 10. The connecting layer 20 and the supporting layer 10 can be prepared independently and then connected to each other, thereby forming the composite supporting structure 100 mentioned in the aforementioned embodiment, which has more preparation selectivity and flexibility.

[0320] In some embodiments, see Fig. 22 In step S210, the

[0321] S211: pre-curing the initial adhesive layer.

[0322] In step S211, pre-curing is the first curing process of the initial glue layer 20', and the pre-curing process can use a light source with a specific energy intensity to optically cure the initial glue layer 20'. At this time, since there is no shielding layer, the structure of the initial glue layer 20' in each area can be pre-cured, so that the second part 22 finally formed can be a solid structure to meet the actual needs of the display device 200.

[0323] In some optional embodiments, step S210 further includes:

[0324] S212: forming a shielding layer on one side of the initial adhesive layer after the pre-curing treatment.

[0325] In step S212, the projection of the shielding layer in the thickness direction Z is located between the projections of adjacent accommodating portions 22' in the thickness direction Z, that is, the shielding layer is used to shield the partial structure of the initial adhesive layer 20' located between adjacent accommodating portions 22', that is, the shielding layer is arranged corresponding to the area where the second portion 22 is subsequently formed.

[0326] S213: curing the initial adhesive layer after the pre-curing treatment from one side of the shielding layer.

[0327] In step 213, due to the presence of the shielding layer, the curing effect on the initial adhesive layer 20' at the location of the second portion 22 is smaller than that at the location of the first portion 21. This can also make the first portion 21 have a greater Young's strength than the second portion 22, thereby achieving the difference in Young's modulus between the two without changing the materials of the two, reducing the manufacturing cost of the display device 200 and improving the reliability of the display device 200.

[0328] In some embodiments, see Fig.23 As shown in FIG. 24 , step S210 includes:

[0329] S214: a receiving portion and a receiving hole are provided on the initial adhesive layer after curing.

[0330] See also Fig.24a In step S214, the accommodating portion 22' is used to accommodate the supporting sub-portion 11, and the accommodating hole 21' is used to subsequently form the second portion 22, wherein the accommodating portion 22' is located between adjacent accommodating holes 21'.

[0331] S215: forming a second portion in the receiving hole.

[0332] See also Figure 24b In step S215, the first part 21 and the second part 22 include different materials, and the Young's modulus of the first part 21 is greater than the Young's modulus of the second part 22. This design can make the first part 21 and the second part 22 have more material selectivity, thereby improving the manufacturing flexibility.

[0333] The embodiment of the present application does not limit the size of the receiving hole 21', and the receiving hole 21' may be set through the initial glue layer 20', or may not be set through the initial glue layer 20'. Optionally, the receiving hole 21' is set through the initial glue layer 20'.

[0334] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted for facilitating the understanding of this application and are not intended to limit the present invention. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of protection of this application shall still be subject to the scope defined in the attached claims.

[0335] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the replacement of other connection methods described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of the present application.

Claims

1. A composite support structure, characterized in that: include: A support layer, the support layer comprising a support sub-portion, the support sub-portion forming a plurality of first gaps, the plurality of first gaps being arranged at intervals; The connecting layer includes a first portion in contact with the supporting sub-portion and a second portion at least partially located in the first gap, and a Young's modulus of the first portion is different from a Young's modulus of the second portion.

2. The composite support structure according to claim 1, characterized in that: The Young's modulus of the first portion is greater than the Young's modulus of the second portion; Preferably, the first part and the second part are made of different materials; or, the first part and the second part are made of the same material; Preferably, the supporting sub-section is an integral structure, and the first gap is an area enclosed by the supporting sub-section; or, a plurality of supporting sub-sections are provided, and when the composite supporting structure is in a flattened state, the plurality of supporting sub-sections are spaced apart along a first direction, and the first gap is located between two adjacent supporting sub-sections.

3. The composite support structure according to claim 1 or 2, characterized in that: The first portion comprises a first sub-portion disposed on one side of the supporting sub-portion, wherein a projection of the first sub-portion in a thickness direction of the composite supporting structure at least covers a projection of the supporting sub-portion in the thickness direction of the composite supporting structure; Preferably, the Young's modulus of the first subsection is greater than the Young's modulus of the second subsection; Preferably, a projection of the first sub-portion in the thickness direction of the composite support structure overlaps with a projection of the first gap in the thickness direction of the composite support structure.

4. The composite support structure according to claim 3, characterized in that: The first sub-portion at least partially covers the second portion; Preferably, the first sub-portion covers the entire second portion; Preferably, the second portion is disposed in contact with a side wall of the corresponding supporting sub-portion; Alternatively, the first portion further comprises a second sub-portion connected to the first sub-portion and located in the first gap, and the second sub-portion is disposed in contact with a side wall of the corresponding supporting sub-portion; Preferably, a surface of the second portion facing the first sub-portion is flush with a surface of the supporting sub-portion facing the first sub-portion.

5. The composite support structure according to claim 3, characterized in that: The first part further includes a second sub-section connected to the first sub-section and located in the first gap, wherein the second sub-section is arranged in contact with a side wall of the corresponding supporting sub-section; wherein the second portion is connected to the second sub-portion, and the Young's modulus of the second sub-portion is greater than the Young's modulus of the second portion; Preferably, the Young's modulus of the first subsection is the same as the Young's modulus of the second subsection; Preferably, the first subsection covers the second subsection; Preferably, the first sub-section and the second sub-section are integrally arranged; Preferably, the second portion is connected to the first sub-portion and the second sub-portion located on the same side; Preferably, a surface of the first sub-portion away from the supporting sub-portion is flush with a surface of the second portion away from the first gap.

6. The composite support structure according to claim 1, characterized in that: The first part and the second part include the same material, and the curing degree of the first part is greater than the curing degree of the second part; Preferably, the connecting layer comprises at least one of solid optical glue, liquid optical glue, thermoplastic polyurethane elastomer rubber and silicone rubber; Preferably, the first part and the second part are integrally arranged; Preferably, both the first part and the second part include a photoinitiator, and the concentration of the photoinitiator in the first part is greater than the concentration of the photoinitiator in the second part; Preferably, the supporting sub-part comprises stainless steel, titanium or carbon fiber or the like.

7. The composite support structure according to claim 1, characterized in that: The Young's modulus E1 of the first part and the Young's modulus E2 of the second part satisfy: E1≥3E2; Preferably, the first part and the second part both include liquid optical glue, and E1 and E2 satisfy: 15KPa≤E1≤87KPa, 5KPa≤E2≤20KPa; Alternatively, the first part and the second part both include thermoplastic polyurethane elastomer rubber, and E1 and E2 satisfy: 100MPa≤E1≤800MPa, 10MPa≤E2≤300MPa; Alternatively, the first part and the second part both include silica gel, and E1 and E2 satisfy: 15MPa≤E1≤30MPa, 5MPa≤E2≤10MPa.

8. The composite support structure according to claim 1, characterized in that: The second part is provided with at least one groove, and the groove is formed by a surface depression of the second part on the same side as the supporting sub-part; Preferably, in the thickness direction of the composite support structure, the depth of the groove is smaller than the thickness of the second portion.

9. The composite support structure according to claim 1, characterized in that: The first part includes a first sub-portion arranged at one side of the supporting sub-portion, the thickness of the supporting sub-portion is h1, the minimum thickness of the first sub-portion is h2, and h1 and h2 satisfy: h2≥1 / 2h1; Preferably, h1≥h2; Preferably, 50 μm ≤ h1 ≤ 200 μm; Preferably, the supporting sub-section includes a second curved surface facing the first sub-section, the second curved surface protruding in the direction of the first sub-section, and the minimum thickness h2 of the first sub-section is the minimum distance between the second curved surface and the surface of the first sub-section on the side facing away from the supporting sub-section in the thickness direction of the composite supporting structure.

10. The composite support structure according to claim 1, characterized in that The supporting sub-portion includes a first surface facing away from the first portion, the first surface includes a first arcuate surface, and a plurality of the first arcuate surfaces and a plurality of the first gaps are alternately arranged in a first direction; Wherein, the first arc-shaped surface is arranged to protrude toward the first portion; Preferably, the supporting sub-portion further comprises a second surface facing the first portion, the second surface comprises a second arc-shaped surface, and the second arc-shaped surface is protruded toward the direction of the first portion; Preferably, the Young's modulus of the supporting sub-portion is greater than the Young's modulus of the first portion; and / or the Young's modulus of the supporting sub-portion is greater than the Young's modulus of the second portion.

11. A composite support structure, characterized in that: include: A support layer, comprising a support sub-section, wherein the support sub-section forms a plurality of first gaps, and the plurality of first gaps are arranged at intervals; a connecting layer, comprising a first sub-portion disposed on one side of the supporting sub-portion, wherein a projection of the first sub-portion in the thickness direction of the composite supporting structure at least covers a projection of the supporting sub-portion in the thickness direction of the composite supporting structure; The thickness of the supporting sub-portion is h1, the minimum thickness of the first sub-portion is h2, and h1 and h2 satisfy: h2≥1 / 2h1.

12. The composite support structure according to claim 11, characterized in that The connecting layer further includes a second portion at least partially located within the first gap, the Young's modulus of the first sub-portion being greater than the Young's modulus of the second portion; Preferably, the orthographic projection of the first sub-portion in the thickness direction of the composite support structure overlaps with the orthographic projection of the first gap in the thickness direction of the composite support structure; Preferably, h1≥h2; Preferably, 50 μm ≤ h1 ≤ 200 μm.

13. The composite support structure according to claim 12, characterized in that The first sub-portion at least partially covers the second portion; Preferably, the first sub-portion covers the entire second portion; Preferably, the second portion is disposed in contact with a side wall of the corresponding supporting sub-portion; Preferably, a surface of the second portion facing the first sub-portion is flush with a surface of the supporting sub-portion facing the first sub-portion.

14. The composite support structure according to claim 12, characterized in that The connection layer further includes a second sub-portion connected to the first sub-portion and located in the first gap, wherein the second sub-portion is arranged in contact with a side wall of the corresponding supporting sub-portion; wherein the second portion is connected to the second sub-portion, and the Young's modulus of the second sub-portion is greater than the Young's modulus of the second portion; Preferably, the Young's modulus of the first subsection is the same as the Young's modulus of the second subsection; Preferably, the first subsection covers the second subsection; Preferably, the first sub-section and the second sub-section are integrally arranged; Preferably, the first subsection, the second subsection and the second section are integrally arranged; Preferably, the first sub-portion, the second sub-portion and the second portion comprise the same material, and the curing degree of the first sub-portion is greater than the curing degree of the second portion; Preferably, the connecting layer comprises at least one of solid optical glue, liquid optical glue, thermoplastic polyurethane elastomer rubber and silicone rubber; Preferably, the second portion is connected to the first sub-portion and the second sub-portion located on the same side; Preferably, a surface of the first sub-portion away from the supporting sub-portion is flush with a surface of the second portion away from the first gap.

15. A display device, characterized in that: It comprises a reel, a display screen and a composite support structure as claimed in any one of claims 1 to 14, wherein the support layer is arranged on the non-light-emitting side of the display screen, and the display screen and the composite support structure can be rolled up around the reel.

16. The display device according to claim 15, characterized in that: The supporting sub-portion includes a first surface facing away from the display screen, the first surface includes a first arc-shaped surface, and a plurality of the first arc-shaped surfaces and a plurality of the first gaps are alternately arranged in the winding direction; Wherein, the first curved surface is arranged to protrude toward the display screen; Preferably, at least some of the first arcuate surfaces have different radii; Preferably, the display device includes a first state and a second state, in which the display screen is in a flat state in the first state, and in the second state, the display screen is in a curved state and is rolled up on the reel; In the second state, the support layer is arranged around the scroll with n turns, the radius of the first arc surface is r, and r satisfies: r=R+(i-1)h3, wherein R is the radius of the scroll, h3 is the total thickness of the display screen and the composite support structure, i is the number of turns of the support layer at the position of the first arc surface, and i is a positive integer not greater than n; Preferably, in the second state, the size of the first arcuate surface at the first circle in the winding direction is L1, and the size of the first arcuate surface at the i-th circle in the winding direction is Li, and L1 and Li satisfy: L1≤Li≤L1*(R+(i-1)h3) / R; Preferably, Li=L1*(R+(i-1)h3) / R.

17. A method for preparing a composite support structure, characterized in that: include: Providing a support material layer, patterning the support material layer to form a support sub-section, wherein the support sub-section forms a plurality of first gaps arranged at intervals; Forming an initial glue layer on one side of the supporting sub-part, wherein a portion of the initial glue layer is located in the first gap and covers the surface of the supporting sub-part; The initial adhesive layer is processed to form a connecting layer, wherein the connecting layer includes a first portion in contact with the supporting sub-portion and a second portion at least partially located in the first gap, and the Young's modulus of the first portion is different from that of the second portion.

18. The preparation method according to claim 17, characterized in that: The processing of the initial glue layer includes: forming a shielding layer on one side of the initial glue layer, wherein a projection of the shielding layer in a thickness direction of the supporting sub-portion is located within a projection of the first gap in the thickness direction of the supporting sub-portion; Curing the initial glue layer from a side of the shielding layer away from the initial glue layer to form the first part and the second part; Preferably, the curing process comprises an optical curing process; Preferably, before forming the shielding layer on one side of the initial glue layer, the method further comprises: Performing a pre-curing treatment on the initial adhesive layer, wherein the pre-curing treatment uses a light source with a first energy intensity W1 to optically cure the initial adhesive layer; In the curing process of the initial adhesive layer from the side of the shielding layer away from the initial adhesive layer, optically curing the initial adhesive layer by using a light source with a second energy intensity W2; Among them, W2>W1.

19. The preparation method according to claim 17, characterized in that: The processing of the initial glue layer includes: Performing a curing process on the initial glue layer, and performing a groove process on the cured initial glue layer to form the first part and the receiving hole located in the first part; forming the second portion in the receiving hole, wherein the first portion and the second portion comprise different materials, and a Young's modulus of the first portion is greater than a Young's modulus of the second portion; Preferably, in the process of grooving the initial glue layer, the accommodating hole is provided through the first portion.

20. The preparation method according to claim 17, characterized in that: The supporting material layer is provided, the supporting material layer is patterned to form supporting sub-parts and a plurality of first gaps spaced apart are formed by the supporting sub-parts, and the supporting material layer is formed on a substrate; After the initial glue layer is processed, the method further comprises: The support subsection is separated from the base.

21. A method for preparing a composite support structure, characterized in that: include: Providing an initial glue layer, curing the initial glue layer, and slotting the cured initial glue layer to form a connection layer, wherein the connection layer has a plurality of accommodation portions arranged at intervals; Providing a support material layer, and patterning the support material layer to form support sub-parts arranged at intervals; The supporting sub-portion is arranged in the corresponding accommodating portion to form a composite supporting structure; wherein the connecting layer includes a first portion in contact with the supporting sub-portion, and a second portion at least partially located between adjacent supporting sub-portions, and the Young's modulus of the first portion is different from that of the second portion.

22. The preparation method according to claim 21, characterized in that: The process of curing the initial glue layer and grooving the cured initial glue layer includes: Performing a pre-curing treatment on the initial adhesive layer; Preferably, the process of curing the initial glue layer and grooving the cured initial glue material further includes: A shielding layer is formed on one side of the initial glue layer after the pre-curing treatment, and the projection of the shielding layer in the thickness direction is located between the projections of the adjacent accommodating parts in the thickness direction; The initial glue layer after the pre-curing treatment is cured from one side of the shielding layer to form the first part and the second part.

23. The preparation method according to claim 22, characterized in that: The process of slotting the initial glue material after the curing process includes: The initial glue layer after curing is provided with a receiving hole and the receiving portion, wherein the receiving portion is located between adjacent receiving holes; forming the second portion in the receiving hole, wherein the first portion and the second portion comprise different materials, and a Young's modulus of the first portion is greater than a Young's modulus of the second portion; Preferably, in the process of grooving the initial glue layer, the receiving hole penetrates the initial glue layer.

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