Support backplate and flexible display module
By setting a recessed accommodating area in the non-bending area of the support back plate and filling it with filler, the problem of creases caused by adhesive during the bending process of flexible display modules is solved, achieving better bending performance and lifespan.
Patent Information
- Application Number
- CN202610516851.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-17
- Publication Date
- 2026-05-26
Smart Images
Figure CN122090727A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of display technology, and in particular to a support backplate and a flexible display module. Background Technology
[0002] Flexible display modules have attracted much attention due to their advantages in combining portability with the demand for large-screen displays. Existing flexible display modules consist of a supporting back plate and a foldable display panel, which are usually bonded and fixed together using a full-surface adhesive. During repeated bending of the flexible display module, the adhesive in the bending area can create obvious creases on the surface of the foldable display panel, severely affecting the display effect. Summary of the Invention
[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a support backplate and a flexible display module.
[0004] A first aspect of the present invention provides a support backplate for supporting a foldable display panel, comprising: A support member having at least one bending region and non-bending regions on both sides of the bending region; Each of the non-bending areas is provided with a recessed receiving area on the side near the foldable display panel, and the recessed receiving area is provided with a filler. The filler has a first end face facing the foldable display panel, and the bending area has a second end face facing the foldable display panel; The first end face is flush with the second end face; or, In the direction toward the foldable display panel, the first end face protrudes beyond the second end face.
[0005] In addition, the support back plate of the present invention may also have the following additional technical features: In some embodiments, the minimum distance between the boundary of the concave accommodating area and the corresponding boundary of the bending area is 0.2mm to 2mm.
[0006] In some embodiments, the elastic modulus of the support member is 60 GPa to 200 GPa.
[0007] In some embodiments, the filler includes a first adhesive adapted to the shape of the recessed receiving area, the first adhesive filling the recessed receiving area; or, The filler includes a polymer film, the shape of which is adapted to the shape of the concave accommodating region, and the polymer film is embedded in the concave accommodating region.
[0008] In some embodiments, the concave depth of the concave receiving area is 1 / 3 to 1 / 2 of the thickness of the bending area.
[0009] In some embodiments, the projected shape of the recessed receiving area along the direction parallel to the plane of the foldable display panel is one of annular, square, circular, or elliptical shapes, and the distance between the edge of the recessed receiving area away from the bending area and the outer edge of the non-bending area is 0~20mm.
[0010] In some embodiments, the bending area is provided with a hollow pattern, the hollow pattern including multiple hollow holes, the length of the hollow holes being 3mm to 15mm, the width of the hollow holes being 0.03mm to 0.3mm, and the distance between two adjacent hollow holes being 0.12mm to 0.5mm.
[0011] In some embodiments, the support includes a composite carbon fiber layer, which includes a first carbon fiber support layer and a second carbon fiber support layer. The first carbon fiber support layer is disposed close to the foldable display panel relative to the second carbon fiber support layer, and the carbon fiber extension directions in the first carbon fiber support layer and the second carbon fiber support layer intersect. Wherein, the fiber extension direction of the first carbon fiber support layer is parallel to the bending axis of the bending area, and the first carbon fiber support layer at least covers the bending area and extends to a part of the non-bending area, and the area of the non-bending area not covered forms the concave accommodating area.
[0012] In some implementations, the first end face is an adhesive surface.
[0013] A second aspect of the present invention provides a flexible display module, the flexible display module comprising a foldable display panel and a support back plate as described in any embodiment of the present application; The first end face is bonded and fixed to the foldable display panel.
[0014] In some embodiments, the elastic modulus of the support member is greater than that of the foldable display panel, wherein the elastic modulus of the foldable display panel is 1 GPa to 10 GPa.
[0015] The support backplate and flexible display module disclosed herein have a recessed receiving area in the non-bending area of the support member. The recessed receiving area is filled with a material to achieve bonding and fixation with the foldable display panel, avoiding the use of adhesive in the bending area, eliminating the influence of adhesive creep on the foldable display panel, reducing stress concentration in the bending area, and improving the creases of the flexible display module. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.
[0017] Figure 1 An exemplary structural diagram of the first type of support backplate (metal material) provided in the embodiments of this application; Figure 2 for Figure 1 The structural diagram of the flexible display module corresponding to the first type of support backplate in China; Figure 3 A first shape diagram of a first adhesive in a first type of support backing plate provided in an embodiment of this application; Figure 4 A second shape diagram of the first adhesive in the first type of support backing plate provided in the embodiments of this application; Figure 5 This is an exemplary structural diagram of the second type of support backplate (carbon fiber composite material) provided in the embodiments of this application; Figure 6 for Figure 5 Diagram of the first type of release membrane structure covering the surface of the second type of support backplate; Figure 7 for Figure 5 The diagram shows the structure of the second type of release membrane covering the surface of the second type of support backplate. Figure 8 for Figure 5 The structural diagram of the flexible display module corresponding to the second type of support backplate; Figure 9 An exemplary structural diagram of the third type of support backplate (carbon fiber composite material) provided in the embodiments of this application; Figure 10 An exemplary structural diagram of the fourth type of support backplate (carbon fiber composite material) provided in the embodiments of this application; Figure 11 for Figure 9 and Figure 10 The structural diagram of the flexible display module corresponding to the central support backplate.
[0018] In the above image: 100 Support backplate; 110 Support component; 111 Recessed receiving area; 112 Hollowed-out pattern; 120 First adhesive; 121 Substrate; 122 Adhesive layer; 130 Composite carbon fiber layer; 131 First carbon fiber support layer; 132 Second carbon fiber support layer; 133 Third carbon fiber support layer; 140 Second release membrane; 141 First sub-membrane; 142 Second sub-membrane; 150 Polymer film; 160 Secondary adhesive; A. Bending area; B. Non-bending area; 170° First end face; 180° Second end face; 200 Foldable display panel. Detailed Implementation
[0019] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.
[0020] Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular "comprises" and the present participle "comprising," are interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.
[0021] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.
[0022] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.
[0023] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.
[0024] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.
[0025] Exemplary embodiments are described herein with reference to sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes.
[0026] The first aspect of the embodiments of this application is as follows: Figures 1 to 11 As shown, a support backplate 100 is provided for supporting a foldable display panel 200, comprising: Support member 110, the support member 110 having at least one bending area A and non-bending areas B on both sides of the bending area A; The non-bending area B is provided with a recessed receiving area 111 on the side near the foldable display panel 200, and the recessed receiving area 111 is provided with a filler. The filler has a first end face 170 facing the foldable display panel 200, and the bending area A has a second end face 180 facing the foldable display panel 200; The first end face 170 is flush with the second end face 180; or, In the direction toward the foldable display panel 200, the first end face 170 protrudes from the second end face 180.
[0027] The support backplate 100 serves as the main structure, providing mechanical support for the foldable display panel 200. The support backplate 100 includes a support member 110, which has at least one bending area A and non-bending areas B located on both sides of the bending area A, allowing the support member 110 to bend and flatten synchronously with the foldable display panel 200. For example, a two-fold display panel includes one bending area A, with a non-bending area B distributed on both sides; a three-fold display panel includes two bending areas A, each with a non-bending area B on both sides, and the non-bending area B between the two bending areas A is shared. When the flexible display module is in a bent state, the portion of the support member 110 that actually undergoes bending deformation is the bending area A, while the portion that remains essentially flat or without bending deformation is the non-bending area B.
[0028] The non-bending area B of the support member 110 has a recessed receiving area 111 on the side facing the foldable display panel 200. This recessed receiving area 111 contains a filler material, which has a first end face 170 facing the foldable display panel 200. The bending area A has a second end face 180 facing the foldable display panel 200. For example... Figure 1 , Figure 5 and Figure 9 As shown, the first end face 170 and the second end face 180 are flush, making the end face of the support back plate 100 near the foldable display panel 200 a flat end face, thus improving the flatness of the support back plate 100. Alternatively, as... Figure 10 As shown, in the direction toward the foldable display panel 200, the first end face 170 protrudes relative to the second end face 180. The protruding filler can ensure that the filler contacts the foldable display panel 200 first, avoiding localized loose adhesion caused by uneven surface of the support member 110.
[0029] In this example, by setting a recessed receiving area 111 and filling it with filler in the non-bending area B, the support member 110 and the foldable display panel 200 are bonded and fixed in the non-bending area B. Simultaneously, the bending area A is uncovered by filler, meaning the bending area A features a discontinuous adhesive design. This avoids the continuous presence of adhesive in the bending area A, eliminating the creep problem caused by repeated bending and improving the creases of the flexible display module after long-term bending use, with crease reduction exceeding 50%. Furthermore, the absence of filler in the bending area A reduces bending stress at the bending initiation point and center point, minimizing stress concentration, increasing the bending life of the flexible display module, and reducing the risk of bending breakage.
[0030] In some implementations, such as Figure 1 , Figure 5 , Figure 9 and Figure 10As shown, the minimum distance d between the boundary of the concave accommodating area 111 and the corresponding boundary of the bending area A is 0.2mm~2mm.
[0031] Specifically, the minimum distance d between the boundary of the bending area A and the edge of the recessed receiving area 111 near the bending area A is 0.2mm to 2mm, such as 0.2mm, 0.35mm, 0.5mm, 0.75mm, 0.8mm, 1.0mm, 1.25mm, 1.5mm, 1.75mm, 1.8mm, 2.0mm, or any of the above values. This prevents the filler from getting too close to the edge of the bending area A, prevents the filler from entering the bending area A (e.g., to prevent glue overflow in the bending area A), and prevents peeling caused by edge stress concentration during bending. Among these, a distance less than 0.2mm can easily cause the filler to enter the bending area A, affecting the bending performance; a distance greater than 2mm can affect the bonding strength between the filler and the foldable display panel 200.
[0032] In some embodiments, the elastic modulus of the support 110 is 60 GPa to 200 GPa.
[0033] Specifically, the support member 110 has a high modulus of elasticity, providing sufficient structural support for the foldable display panel 200. The modulus of elasticity of the support member 110 is greater than that of the foldable display panel 200 (typically 1 GPa to 10 GPa), ensuring that the support member 110 maintains good bending performance in the bending zone A, allowing it to undergo repeated bending with the foldable display panel 200 without plastic deformation. For example, the support member 110 can be made of metal, such as stainless steel or titanium alloy; or it can be made of carbon fiber composite materials, which can significantly reduce the weight of the support back plate 100. Furthermore, the modulus of elasticity of carbon fiber composite materials is greater than that of metal materials, exhibiting excellent creep resistance, corrosion resistance, and shock resistance.
[0034] In some implementations, such as Figures 1 to 8 As shown, the filler includes a first adhesive 120, which is adapted to the shape of the recessed receiving area 111 and is filled in the recessed receiving area 111. or, like Figures 9 to 11 As shown, the filler includes a polymer film 150, the shape of which is adapted to the shape of the concave accommodating region 111, and the polymer film 150 is embedded in the concave accommodating region 111.
[0035] Specifically, the support component 110 is made of metal or carbon fiber composite material, and the filler can be an adhesive first adhesive 120. The first adhesive 120 includes at least one of pressure-sensitive adhesive (PSA), thermosetting adhesive, photocurable adhesive, and double-sided adhesive. The PSA includes at least one of acrylic PSA (such as optically clear adhesive, OCA), silicone PSA, and polyurethane PSA. The double-sided adhesive includes a substrate 121 (such as PI substrate 121) and adhesive layers 122 located on both sides of the substrate 121. The adhesive layers 122 can be PSA, etc. The first adhesive 120 and the support component 110 can be integrally molded by thermopressing, which can eliminate the separate adhesive application process on the surface of the support component 110, simplify the process, improve the product yield by 10%~20%, and reduce the manufacturing cost of the support backplate 100. The first adhesive 120 is fixed inside the recessed receiving area 111 of the support member 110, which enables the flexible display module to be thinned by 15μm~65μm, which is beneficial to the lightweight and thin design of the flexible display module.
[0036] The shape of the first adhesive 120 is adapted to the shape of the recessed receiving area 111 and fills the recessed receiving area 111, so that the first end face 170 of the first adhesive 120 is flush with the second end face 180 of the bending area A, improving the overall flatness of the supporting back plate 100 and avoiding the problem of poor molding of the flexible display module at the edge of the first adhesive 120 in the recessed receiving area 111. The projected shape of the recessed receiving area 111 along the direction parallel to the plane of the foldable display panel can be annular, square, circular, elliptical, etc., where the plane of the foldable display panel is... Figure 3 In the xy plane, the shape of the first adhesive 120 is the same as the shape of the recessed receiving area. For example, as shown... Figure 3 As shown, the concave receiving area 111 is an annular groove. The first adhesive 120 can be applied into the annular groove by dispensing. The first adhesive 120 is also annular, reducing the amount of adhesive applied and lowering costs; or, as... Figure 4 As shown, the recessed receiving area 111 is a square groove. The first adhesive 120 can be applied by roller coating or surface application and is also square in shape. It has a large adhesive area and is suitable for sheet adhesive materials, thereby enhancing the bonding strength between the support member 110 and the foldable display panel 200.
[0037] Or, such as Figures 9 to 11As shown, the support member 110 is made of carbon fiber composite material, and the filler includes a polymer film 150. The polymer film 150 includes at least one of polyimide (PI) film, colorless transparent polyimide film, polyamide-imide film, polyethylene terephthalate film, and polyethylene naphthalate film. The polymer film 150 is embedded in the recessed receiving area 111. If the recessed receiving area 111 is a square groove, the polymer film 150 is also square. The first end face 170 of the polymer film 150 is flush with the second end face 180 of the bending area A, so that the end face of the support back plate 100 near the foldable display panel 200 remains flat, which facilitates subsequent processing. The polymer film 150 and the carbon fiber composite material can be integrally formed by hot pressing, without the need for an additional adhesive layer 122 for fixation, which solves the problem of difficult bonding on the carbon fiber surface. Furthermore, the embedded polymer film 150 acts as a dense covering layer, preventing adhesives and other substances from penetrating into the micropores of the carbon fiber and avoiding delamination or microcracks.
[0038] It should be noted that when the support member 110 is made of carbon fiber composite material, the PI film is embedded in the recessed receiving area 111. A second adhesive 160 can be provided on the first end face 170 of the PI film. The second adhesive 160 only covers the first end face 170 of the PI film, and protrudes from the second end face 180 in the direction towards the foldable display panel 200. Alternatively, the second adhesive 160 can be omitted from the first end face 170 of the PI film, which easily ensures the flatness of the support back plate 100 before adhesive application. The second adhesive 160 can be provided in the non-bending area B of the foldable display panel 200, so that the support member 110 can be bonded and fixed to the foldable display panel 200 through the second adhesive 160. This also achieves the adhesive breakage design in the bending area A and improves the creases of the flexible display module. The second adhesive 160 includes at least one of pressure-sensitive adhesive, thermosetting adhesive, photocurable adhesive, and double-sided adhesive.
[0039] In some embodiments, the concave depth of the concave receiving area 111 is 1 / 3 to 1 / 2 of the thickness of the bending area A.
[0040] Specifically, such as Figure 1 As shown, when the support member 110 is made of metal, the recessed depth of the recessed receiving area 111 is 1 / 3 to 1 / 2 of the thickness of the bending area A. This ensures that the filler fills the space of the recessed receiving area 111 while ensuring that the non-bending area B of the support member 110 still has sufficient structural strength, and is also beneficial to the overall thinning of the flexible display module (the filler is the first adhesive 120). If the depth is too small (e.g., less than 1 / 3), the filler thickness will be insufficient, affecting the bonding reliability; if the depth is too large (e.g., greater than 1 / 2), the strength of the support member 110 will be excessively weakened, which may cause the non-bending area B to deform during use.
[0041] In some embodiments, the projected shape of the recessed receiving area 111 along the direction parallel to the plane where the foldable display panel is located is one of the following: annular, square, circular, and elliptical. The distance between the edge of the recessed receiving area 111 away from the bending area A and the outer edge of the non-bending area B is 0~20mm.
[0042] For example, such as Figure 1 and Figure 2 As shown, when the support member 110 is made of metal, the recessed receiving area 111 can be a groove etched into the non-bending area B of the support member 110. This recessed receiving area 111 is recessed from one end face of the non-bending area B near the foldable display panel 200 to the side away from the foldable display panel 200. The position and shape of this recessed receiving area 111 can be flexibly set to adapt to the bonding and fixing requirements of foldable display panels 200 of different sizes and shapes. For example, the recessed receiving area 111 can be... Figure 3 The annular groove shown has a distance m greater than 0 between the edge of the annular groove away from the bending area A and the outer edge of the non-bending area B. m is 0.1~20mm, preferably 5~20mm. For example, m can be 0.1mm, 0.5mm, 1.0mm, 2.5mm, 3.5mm, 5mm, 7mm, 8.5mm, 9mm, 12mm, 13.5mm, 15mm, 16.5mm, 18mm, 19.5mm, 20mm, etc., or any range of the above values. Alternatively, the concave receiving area 111 is as follows: Figure 4 The square groove shown has a distance m of 0 between its edge away from the bending area A and the outer edge of the non-bending area B. The recessed receiving area 111 is filled with a first adhesive 120, which improves the creases of the flexible display module while achieving a thinner design. In this example, when the value of m is greater than 20 mm, meaning the recessed receiving area 111 is too close to the bending area A and too far from the outer edge of the non-bending area B, the bonding area and edge support capacity will be reduced, and warping or deformation may occur at the edges when the display panel is bent.
[0043] For example, such as Figures 5 to 11 As shown, when the support member 110 is made of carbon fiber composite material, the recessed receiving area 111 can be a square groove, and the distance between the edge of the square groove away from the bending area A and the outer edge of the non-bending area B is 0. The recessed receiving area 111 is filled with a first adhesive 120, which improves the creases of the flexible display module while realizing the thinning design of the flexible display module.
[0044] In some implementations, such as Figure 3 and Figure 4As shown, the bending area A is provided with a hollow pattern 112, which includes multiple hollow holes. The length of the hollow holes is 3mm to 15mm, the width of the hollow holes is 0.03mm to 0.3mm, and the distance between two adjacent hollow holes is 0.12mm to 0.5mm.
[0045] Specifically, when the support member 110 is made of metal or carbon fiber composite material, a hollow pattern 112 is provided in the bending area A of the support member 110. The specific shape of the hollow pattern 112 can be set according to design requirements. For example, the hollow pattern 112 includes multiple hollow holes. The shape and size of the multiple hollow holes can be the same or different. The hollow holes can be at least one of the following: strip hole, teardrop hole, capsule hole, elliptical hole, and rhomboid hole. The multiple hollow holes are arranged in an array along the length direction and / or width direction of the bending area A. The width direction is the direction extending from the bending area A to the non-bending area B, and the length direction is perpendicular to the width direction, that is, the width direction is... Figure 3 The x-direction and length direction are... Figure 3 y direction in .
[0046] For example, such as Figure 3 As shown, the perforated pattern includes multiple arrayed strip holes. These strip holes comprise a first perforation group and a second perforation group spaced apart along the x-direction. The first perforation group includes multiple strip holes spaced apart along the y-direction, and the second perforation group also includes multiple strip holes spaced apart along the y-direction. The strip holes extend along the y-direction, with a length of 3mm to 15mm, such as 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, etc. The width of the strip holes along the x-direction is 0.03mm to 0.3mm, such as 0.03mm, 0.8mm, 1.10mm, 0.15mm, 0.20mm, 0.25mm, 0.30mm. The strip holes in the first and second hollow groups are staggered. The gaps between the strip holes in the second hollow group and the adjacent strip holes in the first hollow group are correspondingly set along the x-direction to ensure the connection strength of the bending area A. The spacing between two adjacent strip holes distributed along the y-direction in the first and second hollow groups is 0.12mm to 0.5mm, such as 0.12mm, 0.18mm, 0.20mm, 0.25mm, 0.28mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm, 0.5mm, etc. The spacing between two adjacent rows of strip holes, such as the two strip holes in the first and second hollow groups along the x-direction, is 0.12mm to 0.3mm, such as 0.12mm, 0.15mm, 0.20mm, 0.22mm, 0.25mm, 0.28mm, 0.30mm, etc.
[0047] Setting a hollow pattern 112 in the bending area A can reduce the rigidity of the bending area A, release stress, and avoid stress concentration that could damage the support 110 or the foldable display panel 200. It can also reduce the overall weight of the support 110, which is beneficial to the lightweighting of the product. In addition, the hollow pattern 112 works in conjunction with the glue break design to minimize the constraint of the bending area A on the foldable display panel 200 and improve bending performance.
[0048] In some implementations, such as Figures 5 to 11 As shown, the support member 110 includes a composite carbon fiber layer 130, which includes a first carbon fiber support layer 131 and a second carbon fiber support layer 132. The first carbon fiber support layer 131 is disposed close to the foldable display panel 200 relative to the second carbon fiber support layer 132. Wherein, the fiber extension direction of the first carbon fiber support layer 131 is parallel to the bending axis of the bending area A, and the first carbon fiber support layer 131 at least covers the bending area A and extends to a part of the non-bending area B, and the uncovered area of the non-bending area B forms the concave receiving area 111.
[0049] Specifically, the composite carbon fiber layer 130 includes a first carbon fiber support layer 131 and a second carbon fiber support layer 132, and may also include a third carbon fiber support layer 133 and a fourth carbon fiber support layer, etc. That is, the number of carbon fiber support layers included in the composite carbon fiber layer 130 can be set according to actual needs, such as 2, 3, 4, 5, etc. The carbon fibers of the first carbon fiber support layer 131 near the foldable display panel 200 extend in the same direction as... Figure 5 The bending axes c of the bending zone A shown are parallel, effectively reducing bending stiffness and resistance, while preventing fiber breakage during repeated bending, thereby improving the bending durability of the support backplate 100 and the service life of the flexible display module. The carbon fiber extension directions in adjacent carbon fiber support layers intersect, giving the composite carbon fiber layer 130 balanced mechanical properties overall.
[0050] The first carbon fiber support layer at least covers the bending area A and extends to a portion of the non-bending area B. The remaining carbon fiber support layer covers both the bending area A and the non-bending area B, so that the first carbon fiber support layer 131 directly forms a recessed receiving area 111 in the non-bending area B without the need for additional etching or machining, simplifying the process. The filler can be directly filled or laid on this area, realizing the integrated molding of the support 110 and the filler.
[0051] The carbon fiber support layer comprises resin and carbon fibers impregnated in the resin. The thickness of each carbon fiber support layer and the extension direction of the carbon fibers can be set according to actual needs. For example, such as... Figures 5 to 11 As shown, the composite carbon fiber layer 130 includes a first carbon fiber support layer 131, a second carbon fiber support layer 132, and a third carbon fiber support layer 133 stacked sequentially. The first carbon fiber support layer 131 is disposed near the foldable display panel 200. For example, the thickness of both the first carbon fiber support layer 131 and the third carbon fiber support layer 133 is 10μm~50μm. The thickness of the second carbon fiber support layer 132 is 50μm~120μm. The thickness of layer 133 can be the same or different. The thicknesses of the first carbon fiber support layer 131 and the third carbon fiber support layer 133 can be 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc., or any range of the above values; the thickness of the second carbon fiber support layer 132 can be 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, or any range of the above values. For example, such as... Figure 5 As shown, with the bending axis c of the bending zone A as a reference, the carbon fiber extension directions of the first carbon fiber support layer 131, the second carbon fiber support layer 132, and the third carbon fiber support layer 133 are 0° / 90° / 0° respectively. The 0° direction is set parallel to the extension direction of the bending axis c, and the 90° direction is set perpendicular to the extension direction of the bending axis c. Of course, other extension angles can also be used, such as 0° / 45° / 135°, etc.
[0052] In some embodiments, the first end face 170 is an adhesive surface.
[0053] Specifically, the filler is a first adhesive 120, and the first end face 170 of the first adhesive 120 is the bonding surface; alternatively, the filler can also be a polymer film 150, with a second adhesive 160 disposed on the surface of the polymer film 150, and the first end face 170 of the second adhesive 160 is the bonding surface. A first release film can also be disposed on the side of the second adhesive 160 near the foldable display panel 200, and this first release film only covers the end face of the second adhesive 160 near the foldable display panel 200. The bonding surface of the support member 110 can be directly bonded and fixed to the foldable display panel 200, avoiding an additional adhesive application process.
[0054] Among them, such as Figure 6 and Figure 7As shown, when the filler is the first adhesive 120, a second release film 140 is provided on the end face of the support member 110 near the foldable display panel 200. This second release film 140 covers the bending area A and the non-bending area B of the support member 110. In this example, the second release film 140 at least covers the first end face 170 of the first adhesive 120 to prevent dust and other debris from falling into the first end face 170 of the first adhesive 120 and affecting its bonding performance. Before the support member 110 is bonded and fixed to the foldable display panel 200, the second release film 140 needs to be removed to facilitate bonding and fixing.
[0055] It is understandable that, such as Figure 6 As shown, the second release film 140 can be configured separately. The second release film 140 includes a first sub-film 141 covering the first end face 170 of the first adhesive 120, and a second sub-film 142 covering the surface of the support member 110 located between the two sides of the first adhesive 120. The first sub-film 141 and the second sub-film 142 have equal thickness, which helps improve the flatness of the end face of the support back plate 100 near the foldable display panel 200. The first sub-film 141 can be an adhesive film inherent to the first adhesive 120, such as double-sided tape; or it can be an adhesive film additionally bonded to the surface of the first adhesive 120. A release agent can be provided on the side of the second sub-film 142 near the second end face 180 of the support member 110 to facilitate subsequent removal of the second sub-film 142. The release agent includes at least one of silicone release agents and non-silicone release agents. The silicone release agent includes at least one of dimethyl silicone oil, methyl phenyl silicone oil, hydrogen-containing silicone oil, silicone rubber, and methyl silicone resin. The non-silicone release agent includes at least one of polytetrafluoroethylene, fluororesin powder, and paraffin wax.
[0056] Or, such as Figure 7 As shown, the second release film 140 can be integrally formed, covering the bending area A and the non-bending area B. That is, the second release film 140 at least covers the second end face 180 of the bending area A, extends toward the non-bending area B, and covers the first end face 170 of the first adhesive 120.
[0057] It should be noted that when the support component is made of metal, the preparation method of the support back plate 100 includes: selecting a metal sheet, etching a hollow pattern 112 in the bending area A of the metal sheet, etching a recessed receiving area 111 in the non-bending area B of the metal sheet, and filling the recessed receiving area 111 with a first adhesive 120. The first adhesive 120 can be filled into the recessed receiving area 111 by dispensing, roller coating, or surface application, thus completing the processing and manufacturing of the support back plate 100. Subsequently, the support back plate 100 can be bonded and fixed to the foldable display panel 200 by the first adhesive 120, thus completing the processing and manufacturing of the flexible display module.
[0058] When the support member 110 is made of composite carbon fiber material, it is exemplified by having three carbon fiber support layers. The method for preparing the support back plate 100 includes: First, lay the third carbon fiber support layer 133; then form the second carbon fiber support layer 132 on the surface of the third carbon fiber support layer 133. The third carbon fiber support layer 133 and the second carbon fiber support layer 132 completely cover the bending area A and the non-bending area B. A first carbon fiber support layer 131 is formed on the side of the second carbon fiber support layer 132 away from the third carbon fiber support layer 133. The first carbon fiber support layer 131 at least covers the bending area A and extends toward the non-bending area B to a portion of the area. The area of the second carbon fiber support layer 132 not covered by the first carbon fiber support layer 131 forms a concave receiving area 111. The recessed accommodating area 111 is filled with a first adhesive 120. The first adhesive 120 can be double-sided tape. The surface of the double-sided tape has a second sub-film 142 with a self-release function. The first sub-film 141 is laid on the surface of the first carbon fiber support layer 131. There is no gap between the second sub-film 142 and the first sub-film 141. The second sub-film 142 and the first sub-film 141 together constitute the second release film 140. Alternatively, the surface of the first adhesive 120 does not have a release film. Alternatively, the release film of the first adhesive 120 is first removed, and then a second release film 140 is laid on the entire surface of the first adhesive 120 and the first carbon fiber support layer. The second release film 140 covers the bending area A and the non-bending area B, thus completing the processing and manufacturing of the support back plate 100. Before the support back plate 100 is bonded and fixed to the foldable display panel 200, the second release film 140 is removed, and then the first adhesive 120 on the support back plate 100 is bonded and fixed to the foldable display panel 200 to complete the processing and manufacturing of the flexible display module.
[0059] Alternatively, the recessed accommodating area 111 is filled with a polymer film 150 to complete the fabrication of the support backplate 100. Subsequently, before the support backplate 100 and the foldable display panel 200 are bonded and fixed, a second adhesive 160 is bonded and fixed to the surface of the polymer film 150 of the support backplate 100 or to the position corresponding to the polymer film 150 in the non-bending area B of the foldable display panel 200. This allows the support backplate 100 to be bonded and fixed to the foldable display panel 200 via the second adhesive 160, completing the fabrication of the flexible display module.
[0060] The second aspect of the invention, as follows Figure 2 , Figure 8 and Figure 11 As shown, a flexible display module is provided, the flexible display module including a foldable display panel 200 and a support back plate 100 as described in any embodiment of this application; The first end face 170 is bonded and fixed to the foldable display panel 200.
[0061] Specifically, the supporting backplate 100 and the foldable display panel 200 are bonded and fixed in the non-bending area B by filler embedded in the supporting backplate 100. The bending area A is not covered by the filler, avoiding the continuous presence of adhesive material in the bending area A, eliminating the creep problem caused by repeated bending of the adhesive material in the bending area A, and improving the creases after long-term bending use of the flexible display module. The specific technical features and effects of the flexible display module provided in this application embodiment are consistent with those of the supporting backplate 100, and will not be repeated in this application embodiment.
[0062] The foldable display panel 200 is a conventional panel structure in the art. For example, the foldable display panel 200 includes a support film, a display panel (such as an organic light-emitting diode (OLED) panel or a liquid crystal display (LCD) panel) and a cover plate stacked in sequence. The support film is disposed on the side close to the support back plate 100, and the filler of the support back plate 100 is bonded and fixed to the support film.
[0063] In some embodiments, the elastic modulus of the support member 110 is greater than that of the foldable display panel 200, wherein the elastic modulus of the foldable display panel 200 is 1 GPa to 10 GPa.
[0064] Specifically, the elastic modulus of the support member 110 is greater than that of the foldable display panel 200, ensuring that the support member 110 still has good bending performance in the bending area A, and can be repeatedly bent with the foldable display panel 200 without plastic deformation.
[0065] The flexible display module provided in this application embodiment can be applied to foldable display devices, which can be used as products with display functions such as televisions, mobile phones, tablets, and laptops. This disclosure embodiment does not limit the use of the foldable display device.
[0066] Foldable display devices include electroluminescent displays or other types of displays. Electroluminescent displays include organic electroluminescent displays, quantum dot light-emitting diode displays, or micro LED displays.
[0067] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.
Claims
1. A support backplate for supporting a foldable display panel, characterized in that, include: A support member having at least one bending region and non-bending regions on both sides of the bending region; Each of the non-bending areas is provided with a recessed receiving area on the side near the foldable display panel, and the recessed receiving area is provided with a filler. The filler has a first end face facing the foldable display panel, and the bending area has a second end face facing the foldable display panel; The first end face is flush with the second end face; or, In the direction toward the foldable display panel, the first end face protrudes beyond the second end face.
2. The supporting back plate according to claim 1, characterized in that, The minimum distance between the boundary of the concave accommodating area and the corresponding boundary of the bending area is 0.2mm to 2mm.
3. The supporting back plate according to claim 1, characterized in that, The elastic modulus of the support is 60 GPa to 200 GPa.
4. The supporting back plate according to claim 1, characterized in that, The filler includes a first adhesive that is adapted to the shape of the recessed receiving area and is filled within the recessed receiving area; or, The filler includes a polymer film, the shape of which is adapted to the shape of the concave accommodating region, and the polymer film is embedded in the concave accommodating region.
5. The support backplate according to any one of claims 1-4, characterized in that, The concave depth of the concave accommodating area is 1 / 3 to 1 / 2 of the thickness of the bending area.
6. The support backplate according to any one of claims 1-4, characterized in that, The projected shape of the recessed receiving area along the plane parallel to the foldable display panel is one of the following: ring, square, circle, and ellipse. The distance between the edge of the recessed receiving area away from the bending area and the outer edge of the non-bending area is 0~20mm.
7. The support backplate according to any one of claims 1-4, characterized in that, The bending area is provided with a hollow pattern, which includes multiple hollow holes. The length of each hollow hole is 3mm to 15mm, the width of each hollow hole is 0.03mm to 0.3mm, and the distance between two adjacent hollow holes is 0.12mm to 0.5mm.
8. The support backplate according to any one of claims 1-4, characterized in that, The support includes a composite carbon fiber layer, which includes a first carbon fiber support layer and a second carbon fiber support layer. The first carbon fiber support layer is disposed close to the foldable display panel relative to the second carbon fiber support layer, and the carbon fiber extension directions in the first carbon fiber support layer and the second carbon fiber support layer intersect. Wherein, the fiber extension direction of the first carbon fiber support layer is parallel to the bending axis of the bending area, and the first carbon fiber support layer at least covers the bending area and extends to a part of the non-bending area, and the area of the non-bending area not covered forms the concave accommodating area.
9. The support backplate according to any one of claims 1-4, characterized in that, The first end face is the adhesive surface.
10. A flexible display module, characterized in that, The flexible display module includes a foldable display panel and a support back plate as described in any one of claims 1-9; The first end face is bonded and fixed to the foldable display panel.
11. The flexible display module according to claim 10, characterized in that, The elastic modulus of the support member is greater than that of the foldable display panel, and the elastic modulus of the foldable display panel is 1 GPa to 10 GPa.