A support backboard, display module and display device
By using a three-layer carbon fiber support backplate design and a through-hole structure in the bending area, the problems of stacking misalignment and pressure during bending of foldable display devices are solved, thereby improving the display effect and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2023-04-13
- Publication Date
- 2026-07-21
Smart Images
Figure CN116403484B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and in particular to a support backplate, display module and display device. Background Technology
[0002] With the continuous development of display technology, display devices have been widely used in people's daily lives and work. Among them, foldable displays offer a large display area and good display effect when unfolded, and a small size and portability when folded. Therefore, foldable displays are increasingly favored. Foldable displays are composed of multiple stacked layers. When bent, misalignment occurs between the layers. Assuming the middle light-emitting layer is the bending neutral layer, the screen support backplate below the light-emitting layer in a foldable display is subjected to pressure when bent, which in turn exerts tension on the screen above the support backplate. Over long-term use, repeated stress can cause irreversible deformation—creases—on the screen. This not only affects the display effect of the foldable display, thus impacting the user experience, but also affects the lifespan of the foldable screen. Moreover, to improve the support effect of the support backplate, a high-rigidity material is generally chosen, resulting in a greater reverse force on the screen during bending, making the upper screen more prone to creases. Summary of the Invention
[0003] The purpose of this application is to provide a support backplate, a display module, and a display device, reducing the misalignment between the layers when the support backplate is bent, and reducing the pressure generated when the support backplate is bent, thereby further reducing the tension of the support backplate on the upper screen. The specific technical solution is as follows:
[0004] The first aspect of this application provides a support backplate, the support backplate including a flat area and a bending area that can be bent along a folding axis; the support backplate includes at least a first carbon fiber layer, a second carbon fiber layer and a third carbon fiber layer arranged sequentially, the carbon fibers in each carbon fiber layer are arranged in parallel, wherein the extending direction of the carbon fibers in one carbon fiber layer is perpendicular to the extending direction of the folding axis, the extending directions of the carbon fibers in the other two carbon fiber layers intersect each other, and the angle between any one of the other two layers and the extending direction of the folding axis is an acute angle or an obtuse angle; at least two carbon fiber layers are provided with arrayed through holes in the bending area, and one side of the through hole of at least one carbon fiber layer is parallel to the extending direction of the carbon fibers in that carbon fiber layer; or, the through hole of each carbon fiber layer includes a major axis and a minor axis, and at least one line connecting the endpoint of the major axis and the endpoint of the minor axis is parallel to the extending direction of the carbon fibers in that carbon fiber layer.
[0005] In some embodiments, the first carbon fiber layer and the second carbon fiber layer are provided with arrayed through holes in the bending area, wherein the through holes of the first carbon fiber layer are rectangular, rhomboid or elliptical, and the through holes of the second carbon fiber layer are rectangular, rhomboid or elliptical.
[0006] In some embodiments, the through holes of the first carbon fiber layer and the through holes of the second carbon fiber layer are disposed opposite to each other and have the same shape.
[0007] In some embodiments, the through holes of the first carbon fiber layer and the through holes of the second carbon fiber layer are staggered and have the same shape or different shape.
[0008] In some embodiments, the first carbon fiber layer, the second carbon fiber layer, and the third carbon fiber layer are provided with arrayed through holes in the bending region; the through holes of the first carbon fiber layer are rectangular, rhomboid, or elliptical, the through holes of the second carbon fiber layer are rectangular, rhomboid, or elliptical, and the through holes of the third carbon fiber layer are rectangular, rhomboid, or elliptical.
[0009] In some embodiments, the through holes of the first carbon fiber layer, the through holes of the second carbon fiber layer, and the through holes of the third carbon fiber layer are arranged opposite to each other and have the same shape.
[0010] In some embodiments, the through holes of the first carbon fiber layer, the through holes of the second carbon fiber layer, and the through holes of the third carbon fiber layer are arranged alternately, and their shapes are either the same or different.
[0011] In some embodiments, the through-hole of the carbon fiber layer in which the carbon fiber extending direction is perpendicular to the extending direction of the folding axis is rectangular, and one side of the rectangle is parallel to the extending direction of the carbon fiber in the carbon fiber layer. The through-holes of the other two carbon fiber layers are rhomboid or circular, and the two sides of the rhomboid or the two sides of the circumscribed parallelogram of the ellipse are respectively parallel to the extending direction of the carbon fiber in the other two carbon fiber layers.
[0012] In some embodiments, the through hole is rhomboid, and at least one of the apex corners of the rhomboid is rounded.
[0013] In some embodiments, the direction of the long axis is parallel to the extension direction of the folding axis, the size of the long axis is 3mm-20mm, and the size of the short axis is 0.1mm-0.3mm.
[0014] In some embodiments, the through holes of each carbon fiber layer are arranged in rows along the long axis and in columns along the short axis, with adjacent rows of through holes being staggered.
[0015] In some embodiments, the spacing between adjacent through holes in each carbon fiber layer is 0.1 mm to 1 mm.
[0016] A second aspect of this application provides a display module, the display module comprising: a flexible display panel and the aforementioned support back plate, the support back plate being used to support the flexible display panel, and a third carbon fiber layer being attached to the flexible display panel.
[0017] A third aspect of this application provides a display device including the display module described above.
[0018] The beneficial effects of this application's embodiments: The support backplate provided in this application's embodiments is used to support a flexible display panel. It is made of at least three carbon fiber layers arranged sequentially: a first carbon fiber layer, a second carbon fiber layer, and a third carbon fiber layer. Carbon fiber material is lightweight, which can reduce the overall weight of the support backplate. In addition, carbon fiber contains fibrous material and is anisotropic, with different mechanical properties in different directions. For example, data shows that the tensile strength of carbon fiber material in the 0° direction (meaning parallel to the carbon fiber extension direction) is 2924 MPa, and the tensile strength in the 90° direction (meaning perpendicular to the carbon fiber extension direction) is 71 MPa. Due to the characteristics of carbon fiber material, the fiber direction of one layer of carbon fiber is perpendicular to the folding axis, which will generate a greater rebound force when bent, making the display module less prone to deformation. The extension directions of the carbon fibers in the other two layers intersect each other and form acute or obtuse angles with the folding axis, which can reduce the rebound force generated by the support backplate when bent to a certain extent. Therefore, when it is used to support the display module, it reduces the tension on the upper display module, thereby reducing the risk of creases in the display module due to prolonged tension. Furthermore, opening through holes in the bending area can reduce the difficulty of bending the support back plate, thereby further reducing the rebound force generated during bending. Combined with the direction of the through holes, that is, one side of the through hole in at least one carbon fiber layer is in the same direction as the carbon fiber extension direction in the carbon fiber layer, or at least one line connecting the endpoints of the major axis and the minor axis is parallel to the carbon fiber extension direction in the carbon fiber layer, the number of fibers cut can be reduced, thereby reducing the strength loss in the bending area and ensuring that the support back plate has sufficient support strength.
[0019] By setting through holes in the bending area of the support back plate, the support back plate can be bent more easily. When combined with other layers, it reduces the misalignment between layers, thereby reducing the tensile force on the upper layer in the bending area and prolonging the time for the upper layer to undergo irreversible deformation after repeated stress, thus reducing the creases of the upper layer.
[0020] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.
[0022] Figure 1 A diagram showing the relationship between the distance from the bending center of the same stack of the display device provided in this application and the magnitude of the corresponding misalignment;
[0023] Figure 2 A simplified structural diagram of the support backplate provided in an embodiment of this application;
[0024] Figure 3 for Figure 2 Enlarged structural diagram of region A in the middle;
[0025] Figure 4 A perspective structural diagram of the support back panel in the bending area;
[0026] Figure 5 A schematic diagram of another perspective structure to support the back panel in the bending area;
[0027] Figure 6 A schematic diagram of another perspective structure to support the back panel in the bending area;
[0028] Figure 7 A schematic diagram showing that the through holes of the first carbon fiber layer and the through holes of the second carbon fiber layer of the support backplate provided in this application embodiment are arranged opposite to each other and have the same shape.
[0029] Figure 8 A schematic diagram showing that the through holes of the first carbon fiber layer and the through holes of the second carbon fiber layer of the support backplate provided in this application embodiment are staggered and have the same shape.
[0030] Figure 9 This is a schematic diagram showing the through holes of the first carbon fiber layer, the second carbon fiber layer, and the third carbon fiber layer of the support backplate provided in the embodiments of this application, which are arranged opposite to each other and have the same shape.
[0031] Figure 10 This is a schematic diagram showing the through holes of the first carbon fiber layer, the second carbon fiber layer, and the third carbon fiber layer of the support backplate provided in the embodiments of this application, which are arranged alternately and have the same shape.
[0032] The attached figures are labeled as follows:
[0033] Flat area 10; Bending area 20; Folding axis 21; First carbon fiber layer 30; Second carbon fiber layer 40; Third carbon fiber layer 50; Through hole 60; Major axis 61; Minor axis 62; Carbon fiber extension direction S; Angle α. Detailed Implementation
[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.
[0035] In foldable display devices, the screen support backplate below the light-emitting layer is subjected to pressure when bent, thus generating tension on the screen above the support backplate. Over long-term use, repeated stress can cause irreversible deformation—creases—on the screen. This not only affects the display effect of the foldable display device, thus impacting user experience, but also affects the lifespan of the foldable screen. To address the issue of creases caused by repeated folding of foldable display devices, existing technologies apply forces to both ends of the screen to reduce creases. However, under long-term repeated stress, the surface material of the screen will creep, and this creep is irreversible. Therefore, applying forces to both ends of the screen cannot fundamentally solve the problem. Research has found that the amount of misalignment generated at different positions in the bending zone of a foldable display device is related to the distance from the bending center, such as... Figure 1 The diagram shows the relationship between the distance from the bending center of the same stack of the display device and the corresponding amount of misalignment. It can be seen that in the bending area 20, the further away from the bending center, the greater the amount of misalignment. After reaching the maximum value, it will decrease slightly. In the flat area 10, it remains basically the same. The stress is mainly concentrated in the transition section from the bending area 20 to the flat area 10. By reducing the stress value in this part, the overall misalignment can be reduced.
[0036] Based on the above principles, the first aspect of this application provides a supporting backplate, such as... Figures 2-4As shown, the support backplate includes a flat area 10 and a bending area 20 that can be bent along the folding axis 21. The support backplate includes at least a first carbon fiber layer 30, a second carbon fiber layer 40, and a third carbon fiber layer 50 arranged sequentially. The carbon fibers in each carbon fiber layer are arranged in parallel. The extending direction of the carbon fibers in one carbon fiber layer is perpendicular to the extending direction of the folding axis 21. The extending directions S of the carbon fibers in the other two carbon fiber layers intersect each other, and the angle between any one of the other two layers and the extending direction of the folding axis 21 is an acute or obtuse angle. At least two carbon fiber layers have arrayed through holes 60 in the bending area 20, and one side of the through hole 60 of at least one carbon fiber layer is parallel to the extending direction S of the carbon fibers in that carbon fiber layer; or, each carbon fiber layer's through hole 60 includes a major axis 61 and a minor axis 62, and at least one line connecting the endpoints of the major axis 61 and the minor axis 62 is parallel to the extending direction S of the carbon fibers in that carbon fiber layer.
[0037] It should be noted that the carbon fiber extension direction S in any one of the first carbon fiber layer 30, the second carbon fiber layer 40, and the third carbon fiber layer 50 can be set to be perpendicular to the folding axis 21. When one layer is perpendicular to the folding axis 21, the carbon fiber extension direction S in the other two layers forms an acute or obtuse angle with the folding axis 21. It is clear that the first carbon fiber layer 30, the second carbon fiber layer 40, and the third carbon fiber layer 50 are only used when the support back plate and the display module are in contact; the third carbon fiber layer 50 is specifically fitted to the display module. The accompanying drawings only illustrate the example of the carbon fiber extension direction S of the first carbon fiber layer 30 being perpendicular to the extension direction of the folding axis 21. Those skilled in the art should understand that this does not constitute a limitation on the embodiments of this application. Furthermore, the folding axis 21 in this document can be understood as the center line of the bending area 20 or an axis parallel to the center line; it can be an actual axis or a virtual axis.
[0038] In this embodiment, the supporting backplate is used to support the flexible display panel. It is made of at least three carbon fiber layers: a first carbon fiber layer 30, a second carbon fiber layer 40, and a third carbon fiber layer 50, arranged sequentially. Carbon fiber material is lightweight, which can reduce the overall weight of the supporting backplate. In addition, carbon fiber contains fibrous material and is anisotropic, with different mechanical properties in different directions. For example, data shows that the tensile strength of carbon fiber material in the 0° direction (parallel to the carbon fiber extension direction S) is 2924 MPa, and the tensile strength in the 90° direction (perpendicular to the carbon fiber extension direction S) is 71 MPa. Due to the characteristics of carbon fiber material, the fiber direction of one of the carbon fiber layers is perpendicular to the folding axis 21, which will generate a greater rebound force when bent, making the display module less prone to deformation. The extension directions of the carbon fibers in the other two layers intersect each other and form acute or obtuse angles with the folding axis 21, which can reduce the rebound force generated by the supporting backplate when bent to a certain extent. Thus, when it is used to support the display module, it reduces the tension on the upper display module, thereby reducing the risk of creases in the display module due to prolonged tension. Furthermore, opening through holes 60 in the bending zone 20 can reduce the difficulty of bending the support back plate, thereby further reducing the rebound force generated during bending. Combined with the direction of opening through holes 60, that is, one side of the through hole 60 in at least one carbon fiber layer is in the same direction of extension of the carbon fiber in the carbon fiber layer, or at least one line between the endpoint of the major axis 61 and the endpoint of the minor axis 62 is parallel to the extension direction S of the carbon fiber in the carbon fiber layer, the number of fibers cut can be reduced, thereby reducing the strength loss in the bending zone 20 and ensuring that the support back plate has sufficient support strength. Understandably, the through hole 60 includes a major axis 61 or a minor axis 62. It can be understood that the through hole 60 is an axisymmetric figure about the major axis 61 or the minor axis 62. The endpoints of the major axis 61 refer to the two intersections with the through hole 60 along the direction of the major axis 61, and the endpoints of the minor axis 62 refer to the two intersections with the through hole 60 along the direction of the minor axis 62. When the through hole 60 is an axisymmetric figure, the line connecting the endpoints of the major axis 61 and the minor axis 62 is a parallelogram. At least one of the connecting lines is parallel to the carbon fiber extension direction S of the carbon fiber layer. That is, one side of the inscribed parallelogram formed by the intersections of the major axis 61 and the minor axis 62 with the through hole 60 is parallel to the carbon fiber extension direction S of the carbon fiber layer.
[0039] By providing through holes 60 in the bending area 20 of the support back plate, such as Figure 3 As shown, the arrangement of the through holes 60 is illustrated by a rhombus shape. The through holes 60 not only make the support back plate easier to bend, but also reduce the misalignment between the layers when combined with other layers, thereby reducing the tensile force on the upper layer of the bending zone 20 and prolonging the time for the upper layer to undergo irreversible deformation after repeated stress, thus reducing the creases of the upper layer.
[0040] In some embodiments, such as Figures 4-8 As shown, the first carbon fiber layer 30 and the second carbon fiber layer 40 have arrayed through holes 60 in the bending area 20. The through holes 60 of the first carbon fiber layer 30 are rectangular, rhomboid or elliptical, and the through holes 60 of the second carbon fiber layer 40 are rectangular, rhomboid or elliptical.
[0041] In this embodiment, through holes 60 arranged in an array are only provided in the bending areas 20 of the first carbon fiber layer 30 and the second carbon fiber layer 40. For the entire support back plate, this is equivalent to opening blind holes. Opening blind holes reduces the overall strength of the support back plate less, which is beneficial to improving the overall strength of the support back plate. The shape of the through holes 60 in the first carbon fiber layer 30 can be rectangular, rhomboid, or elliptical, and the shape of the through holes 60 in the second carbon fiber layer 40 can also be rectangular, rhomboid, or elliptical. The shapes of the through holes 60 in the first carbon fiber layer 30 and the second carbon fiber layer 40 can be the same or different.
[0042] Optionally, such as Figure 7 As shown, the through holes 60 of the first carbon fiber layer 30 and the through holes 60 of the second carbon fiber layer 40 are arranged opposite each other and have the same shape.
[0043] In this embodiment, the through holes 60 of the two carbon fiber layers are arranged opposite each other and have the same shape, so the hole-opening process can be completed in one go, improving hole-opening efficiency and reducing production costs.
[0044] Optionally, the through holes 60 of the first carbon fiber layer 30 and the through holes 60 of the second carbon fiber layer 40 are staggered and may have the same shape or different shapes, such as... Figure 8 The diagram shows the through holes 60 of the first carbon fiber layer 30 and the through holes 60 of the second carbon fiber layer 40, which are staggered and have the same shape.
[0045] In this embodiment, the through holes 60 in the two carbon fiber layers are staggered, that is, the through holes 60 are misaligned in the thickness direction of the support back plate, which makes the bending uniformity of the support back plate as a whole in the bending area 20 better and reduces the probability of stress concentration.
[0046] In some embodiments, such as Figures 4-6 as well as Figure 9 , Figure 10 As shown, the first carbon fiber layer 30, the second carbon fiber layer 40 and the third carbon fiber layer 50 are provided with arrayed through holes 60 in the bending area 20; the through holes 60 of the first carbon fiber layer 30 are rectangular, rhomboid or elliptical, the through holes 60 of the second carbon fiber layer 40 are rectangular, rhomboid or elliptical and the through holes 60 of the third carbon fiber layer 50 are rectangular, rhomboid or elliptical.
[0047] In this embodiment, all three carbon fiber layers are provided with through holes 60, which can further reduce the difficulty of bending the support back plate, thereby further reducing the rebound force generated after the support back plate is bent. This makes the tension on the display module less when the support back plate is used to support the display module, thereby reducing the risk of creases in the display module due to prolonged tension and extending the time before the display module undergoes irreversible deformation after repeated stress, thus reducing creases within the service life of the foldable display device.
[0048] Optionally, such as Figure 9 As shown, the through holes 60 of the first carbon fiber layer 30, the through holes 60 of the second carbon fiber layer 40, and the through holes 60 of the third carbon fiber layer 50 are arranged opposite each other and have the same shape.
[0049] In this embodiment, the through holes 60 of the three carbon fiber layers are arranged opposite each other and have the same shape. For the entire support back plate, it is equivalent to opening through holes 60. Therefore, the hole opening process can be completed in one go, improving hole opening efficiency and reducing production costs.
[0050] Optionally, the through holes 60 of the first carbon fiber layer 30, the through holes 60 of the second carbon fiber layer 40, and the through holes 60 of the third carbon fiber layer 50 are staggered and may have the same shape or different shapes, such as... Figure 10 The diagram shows the through holes 60 of the first carbon fiber layer 30, the through holes 60 of the second carbon fiber layer 40, and the through holes 60 of the third carbon fiber layer 50, which are arranged alternately and have the same shape.
[0051] In this embodiment, when the through holes 60 of the first carbon fiber layer 30, the second carbon fiber layer 40, and the third carbon fiber layer 50 are completely staggered in the thickness direction of the support back plate, it is equivalent to opening blind holes in the support back plate. When the through holes 60 of the first carbon fiber layer 30, the second carbon fiber layer 40, and the third carbon fiber layer 50 are only partially staggered in the thickness direction of the support back plate, it is equivalent to opening through holes 60 in the support back plate. Both of these situations can improve the bending uniformity of the support back plate as a whole in the bending zone 20 and reduce the probability of stress concentration.
[0052] Furthermore, considering the staggered arrangement of the carbon fibers, multiple processes are required to create the openings. Therefore, different opening shapes can be selected based on the different extension directions of the carbon fibers to reduce the number of carbon fibers that need to be cut, thereby improving the overall strength of the support backplate.
[0053] Furthermore, such as Figure 4As shown, the through-hole 60 of the carbon fiber layer, in which the carbon fiber extension direction is perpendicular to the extension direction of the folding axis 21, is rectangular, with one side of the rectangle parallel to the carbon fiber extension direction S in that carbon fiber layer. The through-holes 60 of the other two carbon fiber layers are rhomboid or circular, with the two sides of the rhomboid or the two sides of the circumscribed parallelogram of the ellipse parallel to the carbon fiber extension direction in the other two carbon fiber layers, respectively.
[0054] In this embodiment, a rectangular through hole 60 is formed in the carbon fiber layer where the carbon fiber extension direction S is perpendicular to the folding axis 21, with one side of the rectangle parallel to the extension direction of the carbon fibers in this carbon fiber layer. Diamond-shaped or elliptical holes are formed in the other two intersecting carbon fiber layers, with two sides of the circumscribed parallelogram of the diamond or ellipse parallel to the extension direction of the carbon fibers in those two carbon fiber layers, minimizing the number of fibers cut and ensuring sufficient support strength for the backplate.
[0055] In addition, after the diamond-shaped hole is opened in the bending area 20, the remaining part connecting the two flat areas 10 is easier to compress. When bending, the bending area 20 shrinks towards the bending centerline, which can reduce the force on the upper stack and thus reduce the amount of slippage.
[0056] Furthermore, such as Figure 6 As shown, the through hole 60 is rhomboid, and at least one of the apex corners of the rhomboid is rounded.
[0057] In this embodiment, the apex of the rhomboid through hole 60 is rounded, which can reduce stress concentration at the apex and reduce the amount of misalignment after bending in the bending area 20.
[0058] Optionally, such as Figures 4-6 As shown, in some embodiments, the through-holes 60 of each carbon fiber layer include a major axis 61 and a minor axis 62. For example, the through-holes 60 of the first carbon fiber layer 30 and the second carbon fiber layer 40 include a major axis 61 and a minor axis 62, or the through-holes 60 of the first carbon fiber layer 30, the second carbon fiber layer 40, and the third carbon fiber layer 50 include a major axis 61 and a minor axis 62. The direction of the major axis 61 is parallel to the extension direction of the folding shaft 21, and the size of the major axis 61 is 3mm-20mm, while the size of the minor axis 62 is 0.1mm-0.3mm.
[0059] In this embodiment, the direction of the long axis 61 of the through hole 60 of each carbon fiber layer is parallel to the extension direction of the folding axis 21. Therefore, the bending difficulty of the carbon fiber layer can be reduced, and the flatness of the carbon fiber layer can be more easily guaranteed after bending. This helps to reduce the mold marks of the entire display module and achieve a better appearance.
[0060] The major axis 61 has a dimension of 3mm-20mm, such as 3.5mm, 4mm, 5mm, 10mm, 18mm, 19mm, 19.5mm, etc., while the minor axis 62 has a dimension of 0.1mm-0.3mm, such as 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc. When the dimensions of the major axis 61 and minor axis 62 of the through hole 60 are too small, more through holes 60 need to be drilled, increasing the workload of drilling. When the dimensions of the major axis 61 and minor axis 62 are too large, such as the major axis 61 being greater than 20mm and the minor axis 62 being greater than 0.3mm, the strength of the support back plate is weakened excessively, greatly reducing the support effect of the support back plate.
[0061] In the above embodiments, as Figure 2 , Figures 7-10 As shown, the through holes 60 of each carbon fiber layer are arranged in rows along the long axis 61 and in columns along the short axis 62, with adjacent rows of through holes 60 being staggered.
[0062] In this embodiment, the array arrangement of the through holes 60 is such that two adjacent rows of through holes 60 are staggered, so that each through hole 60 is symmetrically distributed relative to the part connecting the through holes 60, thereby giving the support back plate better bending uniformity.
[0063] Furthermore, such as Figures 7-10 As shown, the spacing between adjacent through holes 60 in each carbon fiber layer is 0.1mm-1mm, for example, the spacing can be 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, etc.
[0064] In this embodiment, the spacing ensures sufficient connection strength between the support back plate and the adjacent through holes 60, making the support back plate easy to bend but not easy to break. Understandably, if the spacing is too small, for example less than 0.1mm, the support back plate will easily break; if the spacing is too large, for example greater than 1mm, the support back plate will have a large rebound force after bending.
[0065] Understandably, such as Figure 4 As shown, when the through-hole 60 is rhomboid, the included angle α of the rhombus can be determined based on the displacement of the support back plate and the entire folding device after folding, as well as the external force on the display module. Here, the included angle α is an acute angle. Assuming the foldable display device has no creases, the theoretical shortening of the support back plate after folding is x1, and the displacement of the entire folding device is x2. At this point, an external force F is needed to compress the support back plate, causing the support back plate area to shorten by x1-x2. Based on the number of holes n, the shortening amount of each rhomboid hole can be calculated as (x1-x2) / n. Then, based on the material properties, a suitable angle α can be calculated.
[0066] A second aspect of this application provides a display module, which includes a flexible display panel and a supporting back plate. The supporting back plate is used to support the flexible display panel, and a third carbon fiber layer 50 is attached to the flexible display panel.
[0067] In this embodiment, the support back plate for supporting the display module includes at least three carbon fiber layers, and the carbon fiber extension direction S in at least one carbon fiber layer is perpendicular to the folding axis 21, which can improve the rebound force provided to the display module when the support back plate is bent, making the display module less prone to deformation. The carbon fiber extension directions in the other two layers intersect each other and form acute or obtuse angles with the folding axis 21. Combined with the direction of the through hole 60 in the bending area 20, that is, one side of the through hole 60 or one side of the circumscribed parallelogram of the through hole 60 is in the same direction as the carbon fiber in the carbon fiber layer, the number of fibers cut can be reduced, thereby reducing the strength loss of the bending area 20.
[0068] In this embodiment, the third carbon fiber layer 50 is located close to the support back plate. When the support back plate only has through holes 60 in the first carbon fiber layer 30 and the second carbon fiber layer 40, that is, the third carbon fiber layer 50 close to the flexible display panel does not have through holes 60. The two layers away from the flexible display panel have through holes 60 with opposite positions and the same shape, or through holes 60 with staggered positions and the same shape. This can also make the surface flatness of the third carbon fiber layer 50 close to the flexible display panel better, which is conducive to reducing the molding of the entire display module and achieving a better appearance effect.
[0069] A third aspect of this application provides a display device including the display module described above.
[0070] In this embodiment, the support back plate of the display module included in the display device includes at least three carbon fiber layers, and the carbon fiber extension direction S in at least one carbon fiber layer is perpendicular to the folding axis 21 direction. This can improve the rebound force provided to the display module when the support back plate is bent, making the display module less prone to deformation. The extension directions of the carbon fibers in the other two layers intersect each other and form acute or obtuse angles with the folding axis 21. Combined with the direction of the through hole 60 in the bending area 20, that is, one side of the through hole 60 or one side of the circumscribed parallelogram of the through hole 60 is in the same direction as the extension direction of the carbon fiber in the carbon fiber layer, the number of fibers cut can be reduced, thereby reducing the strength loss of the bending area 20.
[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0072] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.
[0073] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.
Claims
1. A support backplate, characterized in that, The support back plate includes a flat area and a bending area that can be bent along the folding axis; The support back plate includes at least a first carbon fiber layer, a second carbon fiber layer and a third carbon fiber layer arranged in sequence. The carbon fibers in each carbon fiber layer are arranged in parallel. The carbon fiber extension direction in one carbon fiber layer is perpendicular to the extension direction of the folding axis. The carbon fiber extension directions in the other two carbon fiber layers intersect each other, and the angle between the carbon fiber extension direction in the other two layers and the extension direction of the folding axis is an acute angle or an obtuse angle. At least two carbon fiber layers have arrayed through holes in the bending area, and one side of the through hole in at least one carbon fiber layer is parallel to the carbon fiber extension direction of the carbon fiber in the carbon fiber layer; or, the through hole in each carbon fiber layer includes a major axis and a minor axis, and at least one line connecting the endpoint of the major axis and the endpoint of the minor axis is parallel to the carbon fiber extension direction of the carbon fiber in the carbon fiber layer. The through holes of the first carbon fiber layer and the through holes of the second carbon fiber layer are staggered, or the through holes of the first carbon fiber layer, the through holes of the second carbon fiber layer and the through holes of the third carbon fiber layer are all staggered.
2. The supporting back plate according to claim 1, characterized in that, The first carbon fiber layer and the second carbon fiber layer have arrayed through holes in the bending area. The through holes in the first carbon fiber layer are rectangular, rhomboid, or elliptical, and the through holes in the second carbon fiber layer are rectangular, rhomboid, or elliptical.
3. The supporting back plate according to claim 2, characterized in that, The through-holes in the first carbon fiber layer have the same shape as the through-holes in the second carbon fiber layer.
4. The supporting back plate according to claim 2, characterized in that, The through-holes in the first carbon fiber layer have different shapes than those in the second carbon fiber layer.
5. The supporting back plate according to claim 1, characterized in that, The first carbon fiber layer, the second carbon fiber layer, and the third carbon fiber layer are provided with arrayed through holes in the bending area; the through holes of the first carbon fiber layer are rectangular, rhomboid, or elliptical, the through holes of the second carbon fiber layer are rectangular, rhomboid, or elliptical, and the through holes of the third carbon fiber layer are rectangular, rhomboid, or elliptical.
6. The supporting back plate according to claim 5, characterized in that, The through-holes in the first carbon fiber layer, the second carbon fiber layer, and the third carbon fiber layer have the same shape.
7. The supporting back plate according to claim 5, characterized in that, The through-holes in the first carbon fiber layer, the second carbon fiber layer, and the third carbon fiber layer have different shapes.
8. The support backplate according to any one of claims 1-7, characterized in that, The through-hole of the carbon fiber layer in which the extension direction of the carbon fiber is perpendicular to the extension direction of the folding axis is rectangular, and one side of the rectangle is parallel to the extension direction of the carbon fiber in the carbon fiber layer. The through-holes of the other two carbon fiber layers are rhomboid or elliptical, and the two sides of the rhomboid or the two sides of the circumscribed parallelogram of the ellipse are respectively parallel to the extension direction of the carbon fiber in the other two carbon fiber layers.
9. The support backplate according to any one of claims 1-7, characterized in that, The through hole is rhomboid in shape, and at least one of the apex corners of the rhomboid is rounded.
10. The support backplate according to any one of claims 1-7, characterized in that, The spacing between adjacent through holes in each carbon fiber layer is 0.1mm-1mm.
11. A display module, characterized in that, The display module includes: a flexible display panel and a support back plate according to any one of claims 1-10, wherein the support back plate is used to support the flexible display panel, and the third carbon fiber layer is attached to the flexible display panel.
12. A display device, characterized in that, Includes the display module as described in claim 11.