Foldable display device

Abstract

The embodiment of the invention provides a foldable display device. The foldable display device comprises a main screen and an auxiliary screen, and different forms of the foldable display device can be realized through folding or unfolding of the main screen and the auxiliary screen, so that the foldable display device can be applied to different scenes. In the first direction, the two sides of at least one of the first supporting layer and the first cover plate are curved surfaces, the hyperbolic design of the foldable display device can be achieved, and the screen-to-body ratio of the foldable display device is increased.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a foldable display device. Background Technology

[0002] With the development of display technology, small-sized foldable screens that fold vertically and medium-sized foldable screens that fold horizontally have emerged. Medium-sized foldable screens that fold horizontally include a larger main screen when unfolded and a secondary screen that is close to the size of a normal-sized phone when folded. By switching between unfolded and folded states, they are suitable for various scenarios. However, existing horizontally foldable displays often adopt a straight-edge design, resulting in a relatively low screen-to-body ratio.

[0003] Therefore, existing left-right folding displays suffer from a low screen-to-body ratio. Summary of the Invention

[0004] This application provides a foldable display device to improve the technical problem of low screen-to-body ratio in existing left-right folding displays.

[0005] To achieve the above objectives, according to a first aspect of this application, a foldable display device is provided, the foldable display device comprising: The main screen includes the first sub-screen and the second sub-screen; When the foldable display device is configured in a folded state, the second sub-screen, the first sub-screen, and the sub-screen are arranged sequentially along the thickness direction. When the foldable display device is configured in an unfolded state, the sub-screen and the first sub-screen are arranged along the thickness direction, and the second sub-screen and the first sub-screen are arranged along a first direction. The main screen includes a first support layer and a first cover plate. In the first direction, at least one of the first support layer and the first cover plate has curved sides.

[0006] This application provides a foldable display device. The foldable display device includes a main screen and a secondary screen. Different forms of the foldable display device can be achieved by folding or unfolding the main screen and secondary screen, allowing it to be applied to different scenarios. Furthermore, in a first direction, at least one of the first support layer and the first cover plate has curved sides, enabling a hyperbolic design for the foldable display device and increasing its screen-to-body ratio.

[0007] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0009] Figure 1 This is a plan view of the foldable display device provided in the embodiment of this application when it is in the unfolded state.

[0010] Figure 2 This is a plan view of the foldable display device provided in the embodiments of this application when it is in a folded state.

[0011] Figure 3 This is a partial cross-sectional schematic diagram of the foldable display device provided in the embodiments of this application when it is in a folded state.

[0012] Figure 4 This is another partial cross-sectional schematic diagram of the foldable display device provided in the embodiments of this application when it is in a folded state.

[0013] Figure 5 This is a cross-sectional schematic diagram of one side of the main screen provided in an embodiment of this application.

[0014] Figure 6 This is a first cross-sectional schematic diagram of the other side of the main screen provided in an embodiment of this application.

[0015] Figure 7 This is a cross-sectional schematic diagram of the first support layer provided in an embodiment of this application.

[0016] Figure 8 This is a plan view of the first support layer provided in an embodiment of this application.

[0017] Figure 9 This is a second cross-sectional schematic diagram of the other side of the main screen provided in an embodiment of this application.

[0018] Figure 10 This is a first cross-sectional schematic diagram of the main screen / secondary screen provided in an embodiment of this application.

[0019] Figure 11 This is a second cross-sectional schematic diagram of the main screen / sub-screen provided in an embodiment of this application.

[0020] Figure 12 This is a first cross-sectional schematic diagram of the foldable display device provided in an embodiment of this application.

[0021] Figure 13 This is a second cross-sectional schematic diagram of the foldable display device provided in an embodiment of this application. Detailed Implementation

[0022] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0023] This application addresses the technical problem of low screen-to-body ratio in existing left-right folding displays by providing a foldable display device to improve the aforementioned technical problem.

[0024] Figure 1 This is a plan view of the foldable display device provided in the embodiment of this application when it is in the unfolded state. Figure 2 This is a plan view of the foldable display device provided in the embodiments of this application when it is in a folded state. Figure 3 This is a partial cross-sectional schematic diagram of the foldable display device provided in the embodiments of this application when it is in a folded state. Figure 4 This is another partial cross-sectional schematic diagram of the foldable display device provided in the embodiments of this application when it is in a folded state. Figure 5 This is a cross-sectional schematic diagram of one side of the main screen provided in an embodiment of this application. Figure 6 This is a first cross-sectional schematic diagram of the other side of the main screen provided in an embodiment of this application. Figure 7 This is a cross-sectional schematic diagram of the first support layer provided in an embodiment of this application. Figure 8 This is a plan view of the first support layer provided in an embodiment of this application. Figure 9 This is a second cross-sectional schematic diagram of the other side of the main screen provided in an embodiment of this application. Figure 10 This is a first cross-sectional schematic diagram of the main screen / secondary screen provided in an embodiment of this application. Figure 11 This is a second cross-sectional schematic diagram of the main screen / sub-screen provided in an embodiment of this application. Figure 12 This is a first cross-sectional schematic diagram of the foldable display device provided in an embodiment of this application. Figure 13 This is a second cross-sectional schematic diagram of the foldable display device provided in an embodiment of this application.

[0025] like Figure 1 , Figure 2 As shown, this application provides a foldable display device 1, which includes at least two different states. Figure 1 The diagram shown is a plan view of the foldable display device 1 in its unfolded state. Figure 2 The diagram shown is a plan view of the foldable display device 1 in its folded state. Figure 1 , Figure 2 As can be seen, the foldable display device 1 includes a main screen 11 and a secondary screen 12. When the foldable display device 1 is in different states, the screen display in different scenarios can be achieved by switching between the main screen 11 and the secondary screen 12.

[0026] like Figure 1 As shown, when the foldable display device 1 is in the unfolded state, the front of the foldable display device 1 is the main screen 11, and the secondary screen 12 of the foldable display device 1 can be located on the back of the foldable display device 1. The main screen 11 includes a first sub-screen 111 and a second sub-screen 112. The first sub-screen 111 and the second sub-screen 112 can be two independent screens or two parts of a single screen. Figure 1 As shown, the main screen 11 includes a terminal area 101 and a bending area 102. The bending area 102 can belong to the first sub-screen 111, the second sub-screen 112, or be an independent part. The terminal area 101 can be set in the second sub-screen 112 or the first sub-screen 111. The following embodiment uses the terminal area 101 set in the second sub-screen 112 as an example for explanation. For the design when the terminal area 101 is set in the first sub-screen 111, please refer to the following description.

[0027] like Figure 1 As shown, when the foldable display device 1 is in the unfolded state, the first sub-screen 111 and the second sub-screen 112 are set along the first direction X, and the screen is displayed through the first sub-screen 111 and the second sub-screen 112. The sub-screen 12 may or may not display the screen.

[0028] Specifically, such as Figure 1 As shown, when the foldable display device 1 is in the unfolded state, the width of the main screen 11 along the first direction X can be greater than the width of the main screen 11 along the second direction Y, and the angle between the first direction X and the second direction Y is greater than 0 and less than or equal to 90 degrees.

[0029] like Figure 2 As shown, when the foldable display device 1 is in a folded state, the first sub-screen 111 and the second sub-screen 112 are positioned opposite each other in the thickness direction of the foldable display device 1. At the same time, the sub-screen 12 can be placed on the front of the foldable display device 1 to display the image. At this time, the display side of the main screen 11 is sandwiched between the sub-screen 12 and the back cover and can not be displayed.

[0030] Specifically, such as Figure 2 (a) Figure 2 (b) and Figure 2As can be seen in (c), when the foldable display device 1 is in the folded state, the front of the foldable display device 1 is the display surface of the sub-screen 12, one side of the foldable display device 1 is the area corresponding to the bending area 102 and the side of the first sub-screen 111 and the second sub-screen 112, and the back of the foldable display device 1 is the battery cover of the casing.

[0031] Specifically, such as Figure 2 As shown, the foldable display device 1 can be equipped with some physical buttons on its side, such as volume buttons and power buttons, and the foldable display device 1 can be equipped with some physical controls on its back, such as a rear camera, flash, and flashlight.

[0032] Figure 1 The image shows the foldable display device 1 in its unfolded state. Figure 2 The diagram shows the foldable display device 1 in its folded state. It is understood that the foldable display device 1 can also exist in other states, such as a state between an unfolded state and a folded state, specifically a semi-unfolded state. In this case, the main screen and the secondary screen will have a certain angle in space. For the form of the foldable display device 1 in the state between unfolded and folded states, please refer to the form of the foldable display device 1 in its folded state and unfolded state, which will not be described again here.

[0033] like Figure 3 , Figure 4 As shown, the structure of the foldable display device 1 when it is in the folded state will be described, as follows: Figure 3 , Figure 4 As shown, the foldable display device 1 includes a main screen 11, a secondary screen 12, a first middle frame 21, a second middle frame 22, a front frame 23, a battery cover 24, and a hinge cover 25. When the foldable display device 1 is in a folded state, the secondary screen 12 is located on the front of the foldable display device 1, the second middle frame 22 is located between the secondary screen 12 and the main screen 11, the first middle frame 21 is located between the main screen 11 and the battery cover 24, and the hinge cover 25 is located on the side of the foldable display device 1.

[0034] Specifically, such as Figure 4 As shown, the first middle frame 21 is located between the second sub-screen 112 and the battery cover 24, and the second middle frame 22 is located between the sub-screen 12 and the first sub-screen 111. The first sub-screen 111 and the second sub-screen 112 are arranged opposite to each other.

[0035] like Figures 1 to 13As shown in the figure, this application provides a foldable display device 1, which includes a main screen 11 and a secondary screen 12. The main screen 11 includes a first sub-screen 111 and a second sub-screen 112. When the foldable display device 1 is configured in a folded state, the second sub-screen 112, the first sub-screen 111 and the secondary screen 12 are arranged sequentially along the thickness direction Z. When the foldable display device 1 is configured in an unfolded state, the secondary screen 12 and the first sub-screen 111 are arranged along the thickness direction Z, and the second sub-screen 112 and the first screen 111 are arranged along a first direction X. The main screen 11 includes a first support layer 31 and a first cover plate 37. In the first direction X, at least one of the first support layer 31 and the first cover plate 37 has curved sides.

[0036] This application provides a foldable display device 1, which includes a main screen 11 and a secondary screen 12. Different forms of the foldable display device can be achieved by folding or unfolding the main screen 11 and the secondary screen 12, allowing the foldable display device to be applied to different scenarios. Furthermore, in the first direction X, at least one of the first support layer 31 and the first cover plate 37 has curved sides, enabling a hyperbolic design for the foldable display device and increasing its screen-to-body ratio.

[0037] Specifically, the angle between the first direction X and the thickness direction Z is greater than 0 and less than or equal to 90 degrees.

[0038] In some embodiments, such as Figures 5 to 9 As shown, in the first direction X, the two sides of the first support layer 31 are curved surfaces. By making the two sides of the first support layer 31 curved surfaces, the double-curved design of the foldable display device 1 can be realized, thereby increasing the screen ratio of the foldable display device.

[0039] Specifically, compared to current display devices that use a straight-edge design for the main screen, resulting in a large bezel, this embodiment of the application makes the two sides of the first support layer 31 curved. This allows other film layers to bend when bonded to the first support layer 31, thereby achieving a curved design for the main screen in both the terminal and non-terminal areas, increasing the screen-to-body ratio of the foldable display device. Furthermore, because the two sides of the foldable display device are curved, its appearance is improved, resulting in a better grip and allowing for a thinner overall design when closed, enhancing the user experience and increasing product competitiveness.

[0040] In some embodiments, such as Figure 7As shown in (a), the first support layer 31 includes a first support portion 311, a second support portion 312, a third support portion 313, a fourth support portion 314 and a fifth support portion 315. The first support portion 311 is connected to the third support portion 313 through the second support portion 312, and the first support portion 311 is connected to the fifth support portion 315 through the fourth support portion 314. The upper surfaces of the second support portion 312 and the fourth support portion 314 are curved, while the upper surfaces of the first support portion 311, the third support portion 313, and the fifth support portion 315 are flat. By making the upper surfaces of the second support portion 312 and the fourth support portion 314 curved, the edge of the first support layer 31 can be bent to one side, thereby realizing the double-sided bending design of the first support layer 31. Correspondingly, this achieves the hyperbolic design of the foldable display device 1, increasing the screen-to-body ratio of the foldable display device.

[0041] Specifically, such as Figure 7 As shown in (a), the upper surfaces of the first support part 311, the third support part 313, and the fifth support part 315 are flat, while the upper surfaces of the second support part 312 and the fourth support part 314 are curved. This allows the edge of the first support layer 31 to be bent, thereby realizing the hyperbolic design of the foldable display device 1 and improving the screen ratio of the foldable display device.

[0042] Specifically, such as Figure 7 As shown in (a), the lower surfaces of the first support portion 311, the third support portion 313, and the fifth support portion 315 are flat, while the lower surfaces of the second support portion 312 and the fourth support portion 314 are curved. The curvature of the upper surfaces of the second support portion 312 and the fourth support portion 314 is the same as the curvature of the lower surfaces of the second support portion 312 and the fourth support portion 314, respectively. This means that the second support portion 312 and the fourth support portion 314 can be bent as a whole, so that the curvature of their upper and lower surfaces is consistent.

[0043] Specifically, the upper surfaces of the second support portion 312 and the fourth support portion 314 can be arc surfaces, and the lower surfaces of the second support portion 312 and the fourth support portion 314 can be arc surfaces.

[0044] In some embodiments, such as Figure 1 , Figure 8As shown, the main screen 11 includes a terminal area 101, which is located on the side of the second sub-screen 112 away from the first sub-screen 111. On the side of the first sub-screen 111 away from the second sub-screen 112, the first support layer 31 includes a plurality of through holes 319. By providing a plurality of through holes 319 on the side of the first support layer 31 away from the terminal area 101, the rigidity of the first support layer 31 on the side away from the terminal area 101 can be reduced, facilitating subsequent bending of the first support layer 31.

[0045] In some embodiments, such as Figure 1 , Figure 8 As shown, the main screen 11 includes a terminal portion 113, which is disposed on the side of the second sub-screen 112 away from the first sub-screen 111. On the side of the first sub-screen 111 away from the second sub-screen 112, the first support layer 31 includes a plurality of through holes 319. By providing a plurality of through holes 319 on the side of the first support layer 31 away from the terminal portion 113, the rigidity of the first support layer 31 on the side away from the terminal portion 113 can be reduced, facilitating subsequent bending of the first support layer 31.

[0046] Specifically, terminal 113 refers to the portion located at terminal 101.

[0047] Specifically, such as Figure 8 As shown, in the second direction Y, the first vias 319 can be spaced apart, or the first vias 319 can extend from the upper side of the first support layer 31 to the lower side of the first support layer 31. In the first direction X, multiple first vias 319 can be staggered, and the arrangement density of multiple first vias 319 in the first direction X can be different. For example, the arrangement density of first vias 319 near the middle region is greater than the arrangement density of first vias 319 near the edge region, or the arrangement density of first vias 319 near the middle region is less than the arrangement density of first vias 319 near the edge region, or the arrangement density of first vias 319 in each region can be the same.

[0048] Specifically, in the thickness direction of the foldable display device, the first through-hole 319 may or may not penetrate the first support layer 31.

[0049] Specifically, the first via 319 can be filled with epoxy or UV-curable adhesives using a dispensing process to increase the modulus and rigidity of the area with the first via 319 and prevent molding marks from appearing on the front of the screen.

[0050] Specifically, the first support layer 31 can be etched in the terminal area 101 to form through holes, and adhesive can be applied. This can eliminate the need for bonding molds and increase the through hole modulus of the first support layer 31 in the terminal area. At the same time, the first filler tape can be eliminated, thereby achieving a thinner and narrower frame for the folding module.

[0051] Specifically, such as Figure 8 As shown, the first support layer 31 may also have a first through hole 319 in the area corresponding to the bending area 102, thereby improving the bending performance of the bending area 102. Similarly, a filling material may be provided in the first through hole 319.

[0052] In some embodiments, such as Figure 5 , Figure 6 , Figure 7 As shown in (b), the first support layer 31 includes a sixth support portion 316, a seventh support portion 317, and an eighth support portion 318. One end of the sixth support portion 316 is connected to the seventh support portion 317, and the other end of the sixth support portion 316 is connected to the eighth support portion 318. The upper surfaces of the seventh support portion 317 and the eighth support portion 318 are curved, while the upper surface of the sixth support portion 316 is flat. By making the upper surfaces of the seventh support portion 317 and the eighth support portion 318 curved, the edge of the first support layer 31 can be bent to one side, thereby achieving a double-sided bending design of the first support layer 31. This correspondingly achieves a double-curved design for the foldable display device 1, increasing the screen-to-body ratio of the foldable display device.

[0053] Specifically, such as Figure 8 As shown in (a), the upper surface of the sixth support part 316 is flat, while the upper surfaces of the seventh support part 317 and the eighth support part 318 are curved, which allows the edge of the first support layer 31 to be bent, thereby realizing the hyperbolic design of the foldable display device 1 and improving the screen ratio of the foldable display device.

[0054] Specifically, such as Figure 8 As shown in (a), the lower surface of the sixth support 316 is a plane, while the lower surfaces of the seventh support 317 and the eighth support 318 are curved. The curvature of the upper surfaces of the seventh support 317 and the eighth support 318 is the same as that of the lower surfaces of the seventh support 317 and the eighth support 318, which means that the seventh support 317 and the eighth support 318 can be bent as a whole, so that the curvature of their upper and lower surfaces is consistent.

[0055] Specifically, the upper surfaces of the seventh support portion 317 and the eighth support portion 318 can be arc surfaces, and the lower surfaces of the seventh support portion 317 and the eighth support portion 318 can be arc surfaces.

[0056] In some embodiments, such as Figure 9 As shown, the main screen 11 also includes a first back plate 33, a second back plate 41, and a first adhesive layer 27. The first back plate 33 and the second back plate 41 are disposed opposite to each other, and the first support layer 31 is connected to the second back plate 41 through the first adhesive layer 27. By using the first adhesive layer 27 to connect the first support layer 31 and the second back plate 41, the bending radius of the main screen can be reduced, thereby reducing the thickness of the foldable display device 1.

[0057] In some embodiments, such as Figures 5 to 9 As shown, the curvature of the first cover plate 37 is the same as the curvature of the first support layer 31. By making both sides of the first support layer 31 curved, other film layers subsequently attached to the first support layer 31 can also be curved, so that the curvature of the first cover plate 37 is the same as the curvature of the first support layer 31, thereby realizing the double-curved design of the foldable display device 1 and improving the screen ratio of the foldable display device.

[0058] In some embodiments, the curved surfaces on both sides of the first support layer 31 are symmetrically arranged about the center line of the main screen 11, so that the main screen 11 can be symmetrically arranged.

[0059] Specifically, for example, the second support portion and the fourth support portion are symmetrically arranged about the center line of the main screen 11, so that the main screen 11 can be symmetrically arranged.

[0060] Specifically, such as Figure 5 , Figure 6 As shown, the main screen 11 includes a first support layer 31, a first buffer layer (BFL) 32, a first back plate 33, a first display panel 34, a first polarizer 35, a first adhesive layer 36, a first cover plate 37, a second adhesive layer 38, a protective layer 39, a second back plate 41, a first filler tape (Stiffener, STF) 42, and a UV-curable adhesive 43.

[0061] Specifically, the material of the first cover plate 37 can be polyethylene terephthalate with adhesive.

[0062] like Figure 5 As shown, on the opposite side of terminal area 101, the first support layer 31, the first buffer layer 32, the first back plate 33, the first display panel 34, the first polarizer 35, the first adhesive layer 36, the first cover plate 37, the second adhesive layer 38, and the protective layer 39 are sequentially arranged along the thickness direction. Figure 6As shown, in terminal area 101, the first display panel 34 is bent to the back of the main screen 11. A portion of the first display panel 34, the second back plate 41, the first filler tape 42, the first support layer 31, the first buffer layer 32, the first back plate 33, another portion of the first display panel 34, the first polarizer 35, the first adhesive layer 36, the first cover plate 37, the second adhesive layer 38, and the protective layer 39 are arranged sequentially along the thickness direction.

[0063] like Figure 8 As shown, compared to Figure 6 The first filler tape 42 is set to connect the first support layer 31 and the second back plate 41. Alternatively, the first adhesive layer 27 can be used to connect the first support layer 31 and the second back plate 41, thereby reducing the bending radius of the main screen and thus reducing the thickness of the foldable display device 1.

[0064] Specifically, the first buffer layer 32 may include a foam layer, a mesh adhesive, a pressure-sensitive adhesive, or other film layers.

[0065] Specifically, the material of the first support layer 31 can be stainless steel.

[0066] Specifically, the first cover plate 37 can be a flexible cover plate.

[0067] Specifically, as seen in the above embodiments, in this application embodiment, the first support layer 31 can be designed by stamping or full etching to achieve an arc design, an arc-shaped straight edge design, or a full etching design on the edge of the first support layer 31. The first via 319 formed by full etching can be filled with epoxy and UV-curable adhesives through dispensing, increasing the modulus and rigidity of the area with the first via 319 to prevent molding marks in the bonding hole area on the front of the screen. At the same time, the first filling tape can be removed by dispensing, which facilitates the subsequent reduction of the module thickness to achieve a narrow bezel. Furthermore, the two sides of the first support layer 31 are curved, realizing the overall curved surface design of the terminal area and non-terminal area. Other film layers can be bonded to the first support layer 31 to form a curved design, which can be achieved from Figure 5 , Figure 6 The dual-curved design on both sides of the main screen is noticeable.

[0068] Specifically, the middle frame can also be designed with a curved surface, and the first support layer 31 can be bonded to the middle frame by means of frame adhesive or spot adhesive to achieve the double curved surface design of the whole machine.

[0069] In some embodiments, such as Figures 10 to 13 As shown, in the first direction X, both sides of the first cover plate 37 are curved surfaces. By making both sides of the first cover plate 37 curved surfaces, the hyperbolic design of the foldable display device 1 can be realized, thereby increasing the screen-to-body ratio of the foldable display device.

[0070] Specifically, compared to current display devices that use a straight-edge design for the main screen, resulting in a large bezel, this embodiment of the application achieves a curved design for the main screen across both the terminal and non-terminal areas by making the two sides of the first cover plate 37 curved, thereby increasing the screen-to-body ratio of the foldable display device. Furthermore, the curved sides of the foldable display device improve its appearance, making it more comfortable to hold and allowing for a thinner overall design when closed, enhancing user experience and increasing product competitiveness. Moreover, the curved sides of the first cover plate 37 eliminate the need for existing edge strips, enabling a curved full-screen left-right folding design.

[0071] In some embodiments, such as Figure 10 As shown, the first cover plate 37 includes a first cover plate portion 371, a second cover plate portion 372, and a third cover plate portion 373. One end of the first cover plate portion 371 is connected to the second cover plate portion 372, and the other end of the first cover plate portion 371 is connected to the third cover plate portion 373. The upper and lower surfaces of the second cover plate portion 372 and the third cover plate portion 373 are both curved surfaces, while the upper and lower surfaces of the first cover plate portion 371 are both flat surfaces. By making the upper and lower surfaces of the second cover plate portion 372 and the third cover plate portion 373 curved surfaces, the edge of the first cover plate 37 can be bent to one side, thereby achieving a double-sided bending design of the first cover plate 37. This correspondingly achieves the hyperbolic design of the foldable display device 1, increasing the screen-to-body ratio of the foldable display device.

[0072] Specifically, such as Figure 10 As shown, the upper and lower surfaces of the first cover plate 371 are both flat, while the upper and lower surfaces of the second cover plate 372 and the third cover plate 373 are both curved. This allows the edge of the first cover plate 37 to be bent, thereby realizing the hyperbolic design of the foldable display device 1 and improving the screen ratio of the foldable display device.

[0073] Specifically, the curvature of the upper surfaces of the second cover plate portion 372 and the third cover plate portion 373 can be the same as the curvature of the lower surfaces of the second cover plate portion 372 and the third cover plate portion 373, respectively. In other words, the second cover plate portion 372 and the third cover plate portion 373 can be bent as a whole, so that the curvature of their upper and lower surfaces is consistent.

[0074] Specifically, the upper surfaces of the second cover plate portion 372 and the third cover plate portion 373 can be arc surfaces, and the lower surfaces of the second cover plate portion 372 and the third cover plate portion 373 can be arc surfaces.

[0075] In some embodiments, such as Figure 11As shown, in the first direction X, the lower surface of the first cover plate 37 is a plane, the middle area of ​​the upper surface of the first cover plate 37 is a plane, and the edge of the upper surface of the first cover plate 37 is an arc surface. By making the edge of the upper surface of the first cover plate 37 an arc surface, the hyperbolic design of the foldable display device 1 can be realized, thereby increasing the screen ratio of the foldable display device.

[0076] Specifically, the edge of the upper surface of the first cover plate 37 can be an arc surface.

[0077] In some embodiments, the material of the first cover plate 37 is non-uniform thickness glass. When the first cover plate 37 is formed by non-uniform thickness glass, it can be processed by hot bending or by CNC, polishing, etching and other processes during the formation of the first cover plate 37 to realize the curved surface design of the terminal area and non-terminal area of ​​the main screen.

[0078] In some embodiments, such as Figure 4 , Figure 12 , Figure 13 As shown, the foldable display device 1 further includes a first middle frame 21, a second middle frame 22, and a second adhesive layer 61. One side of the first cover plate 37 is connected to the first middle frame 21 via the second adhesive layer 61, and the other side of the first cover plate 37 is connected to the second middle frame 22 via the second adhesive layer 61. By connecting one side of the first cover plate 37 to the first middle frame 21 via the second adhesive layer 61, and the other side of the first cover plate 37 to the second middle frame 22 via the second adhesive layer 61, the edge strip design can be eliminated, thereby realizing a curved full-screen left-right folding design.

[0079] In some embodiments, the curved surfaces on both sides of the first cover plate are symmetrically arranged about the center line of the main screen, so that the main screen 11 can be symmetrically arranged.

[0080] Specifically, for example, the second cover plate portion 372 and the third cover plate portion 373 are symmetrically arranged about the center line of the main screen 11, so that the main screen 11 can be symmetrically arranged.

[0081] Specifically, such as Figure 12 , Figure 13 As shown, the first middle frame 21 and the second middle frame 22 adopt a simulated arc design at the position corresponding to the first cover plate 37, so that one side of the first cover plate 37 can be connected to the first middle frame 21 through the second adhesive layer 61, and the other side of the first cover plate 37 can be connected to the second middle frame 22 through the second adhesive layer 61, thereby realizing the double-curved surface design of the foldable display device 1.

[0082] Specifically, such as Figure 12 , Figure 13 As shown, the first support layer 31 can be connected to the first middle frame 21 and the second middle frame 22 through the third adhesive layer 62.

[0083] Specifically, such as Figures 10 to 13 As shown, the main screen 11 includes a first support layer 31, a first buffer layer 32, a first back plate 33, a first display panel 34, a first support film 44, a fourth adhesive layer 45, a first cover plate 37, a second back plate 41, and a first filler tape 42.

[0084] Specifically, in Figures 10 to 13 The structures of the first support layer 31, the first buffer layer 32, the first back plate 33, the first display panel 34, the second back plate 41, and the first filler tape 42 can be respectively related to... Figures 5 to 8 The first support layer 31, first buffer layer 32, first back plate 33, first display panel 34, second back plate 41, and first filler tape 42 have the same structure, or they can be different. Figures 10 to 13 The structure of the foldable display device in the middle can be compared with Figures 5 to 8 The structure of the foldable display devices in China is different.

[0085] Specifically, Figures 10 to 13 The example described is that the first display panel 34 does not enter the curved area of ​​the first cover plate 37. However, the embodiments of this application are not limited to this. When the first display panel 34 is disposed in the curved area of ​​the first cover plate 37, the two sides of the first support layer 31 can be patterned or set to the same arc design as the first cover plate 37.

[0086] Specifically, as can be seen from the above embodiments, the first cover plate 37 can be formed using glass of equal thickness. During the formation of the first cover plate 37, it can be processed by hot bending or using CNC machining, polishing, etching, or other processes to achieve a curved design for both the terminal area and non-terminal area of ​​the main screen. After being bonded to the first display panel 34, a double-curved screen module is formed. It can also be connected to the middle frame via adhesive and frame adhesive, with the middle frame featuring an arc design to achieve a double-curved surface design.

[0087] Specifically, since the first cover plate 37 is designed to extend the first display panel 34, the first cover plate 37 is connected to the first middle frame and / or the second middle frame by dispensing or frame adhesive. During the closing process of the whole machine, the first cover plate 37 is fixed relative to the middle frame. The stress between the screens is released by the low modulus (40Kpa to 100Kpa) adhesive material between the first support layer 31 and the first middle frame and / or the second middle frame, and the double curved surface design of the left and right folding main screen is realized at the same time. It can also realize the elimination of the pressure strip design of the folding main screen to achieve the full screen design of the folding machine.

[0088] In some embodiments, such as Figures 10 to 13As shown, the secondary screen 12 includes a second cover plate 57, and the two sides of the second cover plate 57 are curved surfaces in the first direction X. By making the two sides of the second cover plate 57 curved surfaces, the double-curved design of the foldable display device 1 can be realized, thereby increasing the screen-to-body ratio of the foldable display device.

[0089] Specifically, compared to the current display devices where the secondary screen adopts a straight-edge design with a large bezel, this embodiment of the application achieves a curved design on both sides of the secondary screen by making the second cover plate 57 curved, thereby increasing the screen-to-body ratio of the foldable display device. Furthermore, the curved sides of the foldable display device improve its appearance, making it more comfortable to hold, allowing for a thinner overall design, enhancing user experience, and increasing product competitiveness. Moreover, the curved sides of the second cover plate 57 allow the dual-curved design of the secondary screen and battery cover to form an approximately symmetrical design. The hinge cover can also adopt a curved design, seamlessly connecting its appearance with the curved surfaces of the secondary screen and battery cover to form an arc shape.

[0090] In some embodiments, such as Figure 10 As shown, the second cover plate 57 includes a fourth cover plate portion 571, a fifth cover plate portion 572, and a sixth cover plate portion 573. One end of the fourth cover plate portion 571 is connected to the fifth cover plate portion 572, and the other end of the fourth cover plate portion 571 is connected to the sixth cover plate portion 573. The upper and lower surfaces of the fifth cover plate portion 572 and the sixth cover plate portion 573 are both curved surfaces, while the upper and lower surfaces of the fourth cover plate portion 571 are both flat surfaces. By making the upper and lower surfaces of the fifth cover plate portion 572 and the sixth cover plate portion 573 curved surfaces, the edge of the second cover plate 57 can be bent to one side, thereby achieving a double-sided bending design of the second cover plate 57. This correspondingly realizes the hyperbolic design of the foldable display device 1, increasing the screen-to-body ratio of the foldable display device.

[0091] Specifically, such as Figure 10 As shown, the upper and lower surfaces of the fourth cover plate 571 are both flat, while the upper and lower surfaces of the fifth cover plate 572 and the sixth cover plate 573 are both curved, which allows the edge of the second cover plate 57 to be bent, thereby realizing the hyperbolic design of the foldable display device 1 and improving the screen ratio of the foldable display device.

[0092] Specifically, the curvature of the upper surfaces of the fifth cover plate portion 572 and the sixth cover plate portion 573 can be the same as the curvature of the lower surfaces of the fifth cover plate portion 572 and the sixth cover plate portion 573, respectively. In other words, the fifth cover plate portion 572 and the sixth cover plate portion 573 can be bent as a whole, so that the curvature of their upper and lower surfaces is consistent.

[0093] Specifically, the upper surfaces of the fifth cover plate portion 572 and the sixth cover plate portion 573 can be arc surfaces, and the lower surfaces of the fifth cover plate portion 572 and the sixth cover plate portion 573 can be arc surfaces.

[0094] In some embodiments, such as Figure 11 As shown, in the first direction X, the lower surface of the second cover plate 57 is a plane, the middle area of ​​the upper surface of the second cover plate 57 is a plane, and the edge of the upper surface of the second cover plate 57 is an arc surface. By making the edge of the upper surface of the second cover plate 57 an arc surface, the hyperbolic design of the foldable display device 1 can be realized, thereby increasing the screen ratio of the foldable display device.

[0095] Specifically, the edge of the upper surface of the second cover plate 57 can be an arc surface.

[0096] In some embodiments, the material of the second cover plate 57 is non-uniform thickness glass. When the second cover plate 57 is formed using non-uniform thickness glass, it can be processed by hot bending or by CNC, polishing, etching and other processes during the formation of the second cover plate 57 to achieve the curved design of the sub-screen.

[0097] In some embodiments, such as Figure 4 , Figure 12 , Figure 13 As shown, the foldable display device 1 also includes a second middle frame 22 and a third adhesive layer 63, with the second middle frame 22 and the second cover plate 57 connected by the third adhesive layer 63. Connecting the second middle frame 22 and the second cover plate 57 via the third adhesive layer 63 eliminates the need for edge strips, thus enabling a curved full-screen left-right folding design.

[0098] In some embodiments, the curved surfaces on both sides of the second cover plate 57 are symmetrically arranged about the center line of the sub-screen 12, so that the sub-screen 12 can be symmetrically arranged.

[0099] Specifically, for example, the fifth cover plate portion 572 and the sixth cover plate portion 573 are symmetrically arranged about the center line of the sub-screen 12, so that the sub-screen 12 can be symmetrically arranged.

[0100] Specifically, such as Figure 12 , Figure 13 As shown, the second middle frame 22 adopts a simulated arc design at the position corresponding to the second cover plate 57, so that the second cover plate 57 can be connected to the second middle frame 22 through the third adhesive layer 63, thereby realizing the double-curved surface design of the foldable display device 1.

[0101] Specifically, such as Figure 12 , Figure 13 As shown, the second support layer 51 and the second middle frame 22 can be connected by the fifth adhesive layer 64.

[0102] Specifically, such as Figures 10 to 13 As shown, the sub-screen 12 includes a second support layer 51, a second buffer layer 52, a third back plate 53, a second display panel 54, a second support film 55, a sixth adhesive layer 56, a second cover plate 57, a fourth back plate 58, and a second filler tape 59.

[0103] Specifically, the structures of the second support layer 51, second buffer layer 52, third back plate 53, second display panel 54, second support film 55, sixth adhesive layer 56, second cover plate 57, fourth back plate 58, and second filler tape 59 in the sub-screen 12 can be the same as or different from the structures of the first support layer 31, first buffer layer 32, first back plate 33, first display panel 34, first support film 44, fourth adhesive layer 45, first cover plate 37, second back plate 41, and first filler tape 42.

[0104] Specifically, the material of the first support membrane 44 can be an acrylic sheet.

[0105] Specifically, Figures 10 to 13 The uppermost membrane layer is either the first cover plate or the second cover plate, but the embodiments of this application are not limited to this. A protective layer may be provided on the first cover plate and the second cover plate.

[0106] Specifically, the above embodiments have provided a detailed description of the foldable display device from aspects such as the film layer structure and the design of a single film layer. It is understood that when there is no conflict between the embodiments, the embodiments can be combined. For example, in the first direction, the two sides of the first support layer are curved surfaces, and in the first direction, the two sides of the first cover plate are curved surfaces.

[0107] In the description of this application, 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0108] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0109] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0110] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A foldable display device, comprising: include: The main screen includes the first sub-screen and the second sub-screen; When the foldable display device is configured in a folded state, the second sub-screen, the first sub-screen, and the sub-screen are arranged sequentially along the thickness direction. When the foldable display device is configured in an unfolded state, the sub-screen and the first sub-screen are arranged along the thickness direction, and the second sub-screen and the first sub-screen are arranged along a first direction. The main screen includes a first support layer and a first cover plate. In the first direction, at least one of the first support layer and the first cover plate has curved sides. 2.The foldable display device of claim 1, wherein, In the first direction, both sides of the first support layer are curved surfaces. 3.The foldable display device of claim 2, wherein, The first support layer includes a first support part, a second support part, a third support part, a fourth support part, and a fifth support part. The first support part is connected to the third support part through the second support part, and the first support part is connected to the fifth support part through the fourth support part. The upper surfaces of the second and fourth support parts are curved, while the upper surfaces of the first, third, and fifth support parts are flat. 4.The foldable display device of claim 2, wherein, The first support layer includes a sixth support part, a seventh support part, and an eighth support part. One end of the sixth support part is connected to the seventh support part, and the other end of the sixth support part is connected to the eighth support part. The upper surfaces of the seventh and eighth support parts are curved, while the upper surface of the sixth support part is flat. 5.The foldable display device of claim 2, wherein, The curvature of the first cover plate is the same as the curvature of the first support layer. 6.The foldable display device of any one of claims 1 to 5, wherein, The main screen includes a terminal portion, which is disposed on the side of the second sub-screen away from the first sub-screen. On the side of the first sub-screen away from the second sub-screen, the first support layer includes a plurality of vias. 7.The foldable display device of any one of claims 1 to 5, wherein, The curved surfaces on both sides of the first support layer are symmetrically arranged about the center line of the main screen. 8.The foldable display device of claim 1, wherein, In the first direction, both sides of the first cover plate are curved surfaces.

9. The foldable display device according to claim 8, characterized in that, The first cover plate includes a first cover plate portion, a second cover plate portion, and a third cover plate portion. One end of the first cover plate portion is connected to the second cover plate portion, and the other end of the first cover plate portion is connected to the third cover plate portion. The upper and lower surfaces of the second and third cover plates are both curved surfaces, while the upper and lower surfaces of the first cover plate are both flat surfaces.

10. The foldable display device according to claim 8, characterized in that, In the first direction, the lower surface of the first cover plate is a plane, the middle area of ​​the upper surface of the first cover plate is a plane, and the edge of the upper surface of the first cover plate is an arc surface.

11. The foldable display device according to claim 8, characterized in that, The first cover plate is made of non-uniform thickness glass.

12. The foldable display device according to claim 8, characterized in that, The foldable display device further includes a first middle frame, a second middle frame, and a second adhesive layer. One side of the first cover plate is connected to the first middle frame through the second adhesive layer, and the other side of the first cover plate is connected to the second middle frame through the second adhesive layer.

13. The foldable display device according to any one of claims 8 to 12, characterized in that, The curved surfaces on both sides of the first cover plate are symmetrically arranged about the center line of the main screen.

14. The foldable display device according to any one of claims 1 to 5, 8 to 12, characterized in that, The sub-screen includes a second cover plate, and in the first direction, both sides of the second cover plate are curved surfaces.

15. The foldable display device according to claim 14, characterized in that, The second cover plate includes a fourth cover plate portion, a fifth cover plate portion, and a sixth cover plate portion. One end of the fourth cover plate portion is connected to the fifth cover plate portion, and the other end of the fourth cover plate portion is connected to the sixth cover plate portion. The upper and lower surfaces of the fifth and sixth cover plates are both curved surfaces, while the upper and lower surfaces of the fourth cover plate are both flat surfaces.

16. The foldable display device according to claim 14, characterized in that, In the first direction, the lower surface of the second cover plate is a plane, the middle area of ​​the upper surface of the second cover plate is a plane, and the edge of the upper surface of the second cover plate is an arc surface.

17. The foldable display device according to claim 14, characterized in that, The second cover plate is made of non-uniform thickness glass.

18. The foldable display device according to claim 14, characterized in that, The foldable display device further includes a second middle frame and a third adhesive layer, wherein the second middle frame and the second cover plate are connected through the third adhesive layer.

19. The foldable display device according to claim 14, characterized in that, The curved surfaces on both sides of the second cover plate are symmetrically arranged about the center line of the sub-screen.

Images