Foldable display device and method of manufacturing the same

Abstract

The application discloses a foldable display device and a manufacturing method thereof, and belongs to the field of display. The foldable display device has a first planar display area (11), a bendable display area (12) and a second planar display area (13) connected in sequence along a first direction. The foldable display device comprises an NFC antenna module (10) and a laminated support plate (20), a support back film (130), a display panel (30) and a flexible cover plate (140). The NFC antenna module (10) is partially overlapped with at least one of the first planar display area (11) and the second planar display area (13), the NFC antenna module (10) is at least partially not overlapped with the bendable display area (12), and the NFC antenna module (10) is located between the support plate (20) and the support back film (130).

Description

Technical Field

[0001] This disclosure relates to the field of displays, and in particular to a foldable display device and a method for manufacturing the same. Background Technology

[0002] Near Field Communication (NFC) is a contactless identification and interconnection technology that enables short-range wireless communication between mobile devices, allowing for identification and data exchange with target devices over short distances. Currently, this technology is widely used in display devices such as mobile phones; for example, NFC can be incorporated into mobile phones to enable functions like public transportation cards.

[0003] A display device with NFC functionality includes an NFC antenna module, a support plate, and a display panel stacked sequentially. The NFC antenna module is located on the back of the support plate. During NFC identification, the back of the display device faces the target device, and the NFC antenna module transmits signals to interact with the target device, enabling NFC identification between the display device and the target device. The signals transmitted by the NFC antenna module cannot pass through the support plate, so NFC identification cannot be achieved from the screen side of the display device. Summary of the Invention

[0004] This disclosure provides a foldable display device and its manufacturing method, enabling NFC recognition on the screen side of the foldable display device. The technical solution is as follows:

[0005] On one hand, this disclosure provides a foldable display device having a first planar display area, a bendable display area, and a second planar display area sequentially connected along a first direction; the foldable display device includes: an NFC antenna module and a stacked support plate, a support back film, a display panel, and a flexible cover plate; the NFC antenna module partially overlaps with at least one of the planar display areas of the first planar display area and the second planar display area, and the NFC antenna module does not at least partially overlap with the bendable display area, and the NFC antenna module is located between the support plate and the support back film.

[0006] In one implementation of this disclosure, the foldable display device further includes a motherboard and a flexible circuit board, the support plate is located between the NFC antenna module and the motherboard, and the NFC antenna module is electrically connected to the motherboard through the flexible circuit board.

[0007] In one implementation of this disclosure, the trace width of the flexible circuit board is greater than or equal to the trace width of the NFC antenna module.

[0008] In one implementation of this disclosure, the trace width of the flexible circuit board ranges from 2 mm to 5 mm, and the trace width of the NFC antenna module ranges from 0.1 mm to 2 mm.

[0009] In one implementation of this disclosure, the foldable display device further includes a motherboard and a conductive structure, with the support plate located between the NFC antenna module and the motherboard; the support plate has a through hole, the conductive structure is located within the through hole, and the NFC antenna module is electrically connected to the motherboard through the conductive structure.

[0010] In one implementation of this disclosure, the conductive structure is a conductive adhesive; or, the conductive structure is a metal spring; or, the conductive structure is a wire.

[0011] In one implementation of this disclosure, the conductive structure is soldered to the motherboard; or, the conductive structure is connected to the motherboard via a pressure bonding adhesive.

[0012] In one implementation of this disclosure, the foldable display device includes an NFC antenna module located in one of the first planar display areas and the second planar display area; or, the foldable display device includes two NFC antenna modules located in the first planar display area and the second planar display area, respectively.

[0013] In one implementation of this disclosure, the NFC antenna module includes an antenna coil and an antenna feed line, the antenna feed line being electrically connected to the antenna coil; the trace width of the antenna feed line is greater than the trace width of the antenna coil.

[0014] In one implementation of this disclosure, the trace width of the antenna coil ranges from 0.1 mm to 2 mm; the trace width of the antenna feed line ranges from 0.5 mm to 5 mm.

[0015] In one implementation of this disclosure, the antenna coil is a copper coil, a silver coil, or an aluminum coil.

[0016] In one implementation of this disclosure, the line spacing of the antenna coil is between 0.1 mm and 1 mm, the inductance of the antenna coil is greater than 0.3 μH, the relative permeability of the antenna coil is greater than 150, and the magnetic loss of the antenna coil is less than 100.

[0017] In one implementation of this disclosure, the support plate is a metal support plate, and the foldable display device further includes a magnetic conductive layer located between the support plate and the NFC antenna module.

[0018] In one implementation of this disclosure, the material of the magnetic conductive layer is at least one of ferrite, amorphous material, and iron-based nanocrystal.

[0019] In one implementation of this disclosure, the foldable display device further includes: a first adhesive layer bonded between the magnetic conductive layer and the support plate; a second adhesive layer bonded between the NFC antenna module and the support back film; and a third adhesive layer bonded between the support plate and the support back film, wherein one surface of the third adhesive layer and the support plate is in contact with the support plate, and one surface of the first adhesive layer and the support plate is in contact with the support plate.

[0020] In one implementation of this disclosure, the difference between the sum of the thickness of the first adhesive layer, the thickness of the magnetic conductive layer, the thickness of the NFC antenna module, and the thickness of the second adhesive layer and the thickness of the third adhesive layer is less than 10 micrometers.

[0021] In one implementation of this disclosure, the thickness of the first adhesive layer ranges from 15 micrometers to 50 micrometers, the thickness of the magnetic conductive layer ranges from 15 micrometers to 50 micrometers, the thickness of the NFC antenna module ranges from 1 micrometer to 35 micrometers, and the thickness of the second adhesive layer ranges from 15 micrometers to 50 micrometers.

[0022] In one implementation of this disclosure, the foldable display device further includes a support structure and a fourth adhesive layer; the support structure has a pivot region and a planar region, and the fourth adhesive layer is bonded between the planar region and the support plate.

[0023] exist

[0024] On the other hand, this disclosure provides a method for manufacturing a foldable display device, the method comprising: providing a support plate; forming an NFC antenna module on a surface of the support plate; and sequentially forming a support back film, a display panel and a flexible cover plate on the surface on which the NFC antenna module is formed.

[0025] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0026] In this embodiment of the disclosure, the NFC antenna module is located between the support plate and the display panel. When performing NFC identification, the screen side of the foldable display device is oriented towards the target device that needs to be interacted with. The signal emitted by the NFC antenna module passes through the display panel and interacts with the target device, thereby realizing NFC identification from the screen side of the foldable display device. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram showing the location of the NFC antenna module in a foldable display device according to an embodiment of this disclosure;

[0029] Figure 2 yes Figure 1 A cross-sectional diagram of surface AA in the diagram;

[0030] Figure 3 This is a top view of an NFC antenna module electrically connected to a flexible circuit board according to an embodiment of this disclosure;

[0031] Figure 4 This is a film layer diagram of a foldable display device provided in an embodiment of this disclosure;

[0032] Figure 5 This is a top view of an NFC antenna module electrically connected to a conductive structure according to an embodiment of this disclosure;

[0033] Figure 6 This is a film layer diagram of another foldable display device provided in this disclosure embodiment;

[0034] Figure 7 yes Figure 6 The diagram shows the film layer of the foldable display device after it has been bent.

[0035] Figure 8 This is a schematic diagram showing the location of the NFC antenna module in another foldable display device provided in this embodiment of the present disclosure;

[0036] Figure 9 yes Figure 8 A schematic diagram of the cross-section of the BB surface;

[0037] Figure 10 yes Figure 8 The diagram shows the film layer of the foldable display device after it has been bent.

[0038] Figure 11 This disclosure provides a method for manufacturing a foldable display device.

[0039] The attached figures are labeled as follows:

[0040] 10. NFC antenna module; 20. Support plate; 30. Display panel; 40. Main board; 50. Flexible circuit board; 101. Antenna coil; 102. Antenna feed line; 60. Conductive structure; 201. Through hole; 103. Antenna substrate; 131. Groove; 70. Magnetic layer; 80. First adhesive layer; 130. Support back film; 150. Back film adhesive layer; 140. Flexible cover plate; 160. Functional module layer; 170. Module adhesive layer; 11. First planar display area; 12. Bendable display area; 13. Second planar display area; 190. Filling layer; 90. Second adhesive layer; 100. Third adhesive layer; 110. Support structure; 120. Fourth adhesive layer; 1101. Rotating hinge area; 1102. Planar area; 1201. Hollowed-out; 180. Connecting layer. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0042] Figure 1 This is a schematic diagram showing the location of the NFC antenna module in a foldable display device according to an embodiment of this disclosure. See also... Figure 1 The foldable display device has an NFC antenna module 10. During NFC interaction, the NFC antenna module 10 transmits signals to interact with the target device. Figure 1 The position and size of the NFC antenna module shown are for illustrative purposes only. In practical applications, different sizes of NFC antenna modules can be selected according to actual needs, or the NFC antenna module can be placed in other locations, such as the middle of the foldable display device. The foldable display device has a first planar display area 11, a bendable display area 12, and a second planar display area 13 connected sequentially along a first direction a. Bending the foldable display device in the bendable display area 12 changes the foldable display device from a planar state to a bent state.

[0043] Figure 2 yes Figure 1 A cross-sectional diagram of surface AA in the diagram. See also... Figure 2 The foldable display device includes an NFC antenna module 10 and stacked support plate 20, back film 130, display panel 30, and flexible cover plate 140. The NFC antenna module 10 is located between the support plate 20 and the back film 130. The NFC antenna module 10 partially overlaps with at least one of the first planar display area 11 and the second planar display area 13, and at least partially does not overlap with the bendable display area 12.

[0044] In this embodiment of the disclosure, the NFC antenna module 10 is located between the support plate 20 and the support back film 130. When performing NFC identification, the screen side of the foldable display device is oriented towards the target device that needs to be interacted with. The signal emitted by the NFC antenna module 10 passes through the display panel 30 to interact with the target device, thereby realizing NFC identification from the screen side of the foldable display device.

[0045] Wherein, the NFC antenna module 10 partially overlaps with at least one of the first planar display areas 11 and the second planar display area 13, indicating that a part of the NFC antenna module 10 overlaps with a part of at least one of the first planar display areas 11 and the second planar display area 13, or the NFC antenna module 10 is located within at least one of the first planar display areas 11 and the second planar display area 13.

[0046] The NFC antenna module 10 and the bendable display area 12 are at least partially non-overlapping, meaning that a portion of the NFC antenna module 10 overlaps with a portion of the bendable display area 12, or the NFC antenna module 10 and the bendable display area 12 do not overlap. Since the NFC antenna module 10 and the bendable display area 12 are at least partially non-overlapping, at least a portion of the NFC antenna module 10 is located in the first planar display area 11 or the second planar display area 13. When the foldable display device is bent, a portion of the NFC antenna module 10 will not bend, compared to the entire NFC antenna module 10 bending, which reduces the possibility of damage to the NFC antenna module 10.

[0047] like Figure 1 As shown, the NFC antenna module 10 is located in the first planar display area 11, and the NFC antenna module 10 does not overlap with the bendable display area 12. In this way, the NFC antenna module 10 does not need to be bent when the foldable display device is bent, reducing the possibility of damage to the NFC antenna module 10.

[0048] In other implementations, the NFC antenna module 10 can be located in the second planar display area 13.

[0049] In other implementations, a portion of the NFC antenna module 10 may be located within the bendable display area 12.

[0050] The backing film 130 is bonded to the display panel 30, protecting the back of the display panel 30 and providing support, thus reducing the possibility of damage to the display panel 30. The flexible cover plate 140 protects the surface of the display panel 30, further reducing the possibility of damage to the display panel 30.

[0051] See you again Figure 2The foldable display device also includes a motherboard 40 and a flexible printed circuit board (FPC) 50. The support plate 20 is located between the NFC antenna module 10 and the motherboard 40, that is, the support plate 20 and the NFC antenna module 10 are located on the motherboard 40 in sequence. The NFC antenna module 10 is electrically connected to the motherboard 40 through the flexible printed circuit board 50.

[0052] In this embodiment, the foldable display device needs to transmit electrical signals with the target device. The NFC antenna module 10 is electrically connected to the motherboard 40. During NFC interaction, the NFC antenna module 10 and the motherboard 40 transmit electrical signals. The NFC antenna module 10 transmits the electrical signals from the motherboard 40 to the target device as electromagnetic signals. The target device transmits electromagnetic signals to the NFC antenna module 10, and the NFC antenna module 10 then transmits the electromagnetic signals from the target device to the motherboard 40 in the form of electrical signals, thus realizing NFC interaction between the foldable display device and the target device. The flexible circuit board 50 is bendable and can be bent from one side of the NFC antenna module 10 to the back of the support plate 20, and electrically connected to the motherboard 40, thus realizing the electrical connection between the NFC antenna module 10 and the motherboard 40.

[0053] In one implementation of this disclosure, the trace width L1 of the flexible circuit board 50 is greater than or equal to the trace width of the NFC antenna module 10. The trace width L1 of the flexible circuit board 50 is the width of the wires used for transmitting electrical signals in the flexible circuit board 50, and the trace width of the NFC antenna module 10 is the width of a single antenna in the NFC antenna module 10.

[0054] In this embodiment, when the foldable display device interacts with the target device via NFC, the NFC antenna module 10 generates an electromagnetic field (i.e., an electromagnetic signal). This electromagnetic field needs to pass through the display panel 30 to be transmitted to the target device, and some loss occurs during transmission. The stronger the magnetic field generated by the NFC antenna module 10, the stronger the electromagnetic signal received by the target device. The NFC antenna module 10 contains a coil, and the number of coil turns is positively correlated with the magnetic field strength of the NFC antenna module 10; the more coil turns, the stronger the magnetic field. The coil in the NFC antenna module 10 is helical and located in the same plane. The NFC antenna module 10 is attached to the support plate 20, reducing the trace width of the NFC antenna module 10. With a fixed coil area and trace spacing, the number of coil turns in the NFC antenna module 10 can be increased, thereby increasing the magnetic field strength of the NFC antenna module 10. Therefore, the electromagnetic signal received by the target device is stronger, ensuring the effectiveness of signal transmission. Increasing the trace width of the flexible circuit board 50 can reduce the resistance of the flexible circuit board 50, thereby reducing the load on the flexible circuit board 50.

[0055] In this embodiment of the disclosure, the width of the trace L1 of the flexible circuit board 50 ranges from 2 mm to 5 mm.

[0056] Since the flexible circuit board 50 bends from one side of the NFC antenna module 10 to the back of the support plate 20 and is electrically connected to the motherboard 40, if the flexible circuit board 50 is too wide, it will occupy too much space on one side of the NFC antenna module 10, affecting the size of the foldable display device. Limiting the trace width of the flexible circuit board 50 to 2 mm to 5 mm ensures reduced resistance and load on the flexible circuit board 50, while avoiding excessively wide traces that would affect the size of the foldable display device.

[0057] In this embodiment of the disclosure, the flexible circuit board 50 can be bonded to the NFC antenna module 10 and the motherboard 40 respectively through anisotropic conductive film (ACF).

[0058] Figure 3 This is a top view of an NFC antenna module electrically connected to a flexible circuit board according to an embodiment of this disclosure. See also... Figure 3 The NFC antenna module 10 includes an antenna coil 101 and an antenna feed line 102, which is electrically connected to the antenna coil 101. The trace width L2 of the antenna feed line 102 is greater than the trace width L3 of the antenna coil 101. The antenna feed line 102 is electrically connected to the flexible circuit board 50. The trace width L2 of the antenna feed line 102 represents the width of the antenna feed line 102, and the trace width L3 of the antenna coil 101 represents the width of a single antenna.

[0059] In this embodiment, the antenna coil 101 is helical, and generates electromagnetic waves to transmit signals to the target device. The antenna feed line 102 is used to electrically connect the flexible circuit board 50 and the antenna coil 101. Increasing the trace width L2 of the antenna feed line 102 results in lower resistance and a smaller load compared to the antenna coil 101.

[0060] In one implementation of this disclosure, the trace width L3 of the antenna coil 101 ranges from 0.1 mm to 2 mm.

[0061] In this embodiment of the disclosure, the trace width L3 of the antenna coil 101 is limited to the range of 0.1 mm to 2 mm. This ensures the number of coil turns of the antenna coil 101 while avoiding the antenna coil 101 from having too narrow a trace width, which would cause the antenna coil 101 to have too high a resistance and increase the load on the antenna coil 101.

[0062] In one implementation of this disclosure, the trace width L2 of the antenna feed line 102 ranges from 0.5 mm to 5 mm.

[0063] In this embodiment of the disclosure, the trace width L2 of the antenna feed line 102 is limited to the range of 0.5 mm to 5 mm. This ensures that the resistance of the antenna feed line 102 is reduced and the load on the antenna feed line 102 is reduced, while avoiding the trace width L2 of the antenna feed line 102 being too wide, which would result in a large space occupied by the antenna feed line 102 and reduce the space occupied by the antenna coil 101.

[0064] In this embodiment of the disclosure, the trace width L2 of the antenna feed line 102 can be equal to the trace width of the flexible circuit board 50.

[0065] In one implementation of this disclosure, the antenna coil 101 is a copper (Cu) coil. Copper has low resistance and is inexpensive. By reducing the resistance of the antenna coil 101 and increasing its relative permeability, the cost of manufacturing the foldable display device can be further reduced.

[0066] Alternatively, in other implementations, the antenna coil 101 is a silver (Ag) coil or an aluminum (Al) coil.

[0067] In this embodiment, the line spacing L4 of the antenna coil 101 is between 0.1 mm and 1 mm. While ensuring the number of turns of the antenna coil 101, the line spacing L4 is kept from being too small, which could cause misconnections between adjacent coils and affect the normal operation of the antenna coil 101. The line spacing L4 of the antenna coil 101 represents the minimum distance between two adjacent antennas.

[0068] In this embodiment of the disclosure, the inductance of the antenna coil 101 is greater than 0.3 microhenries (μH).

[0069] The larger the inductance of the antenna coil 101, the better its filtering effect, which can filter out interfering electromagnetic waves and avoid generating incorrect signal transmission.

[0070] In this embodiment of the disclosure, the relative permeability of the antenna coil 101 is greater than 150, and the magnetic loss of the antenna coil 101 is less than 100. The real part of the permeability is the relative permeability, and the imaginary part of the permeability is the magnetic loss, also known as the relative value of the imaginary part of the permeability.

[0071] In this embodiment of the disclosure, the electromagnetic signal generated by the antenna coil 101 will be lost during transmission. The relative permeability of the antenna coil 101 is limited to be greater than 150 and the magnetic loss is less than 100, so as to ensure that the target device can receive the electromagnetic signal sent by the antenna coil 101 and realize NFC interaction.

[0072] In this embodiment of the disclosure, the antenna coil 101 has a number of turns greater than or equal to 2, and the area of ​​the antenna coil 101 is greater than or equal to 1000 square millimeters (mm²). 2 This ensures that antenna coil 101 can generate effective electromagnetic signals.

[0073] exist Figure 3 In this embodiment, the antenna coil 101 is shaped as a rectangular ring. Alternatively, in other implementations, the antenna coil 101 may be shaped as a circular ring, an elliptical ring, or other regular or irregular ring structures.

[0074] exist Figure 2 In this design, the NFC antenna module 10 is electrically connected to the motherboard 40 via a flexible circuit board 50. The ACF bonding method is relatively simple and can simplify the manufacturing process. However, the flexible circuit board 50 needs to be bent from one side of the NFC antenna module 10 to the motherboard 40 for electrical connection, which increases the size of the foldable display device.

[0075] In other implementations, the NFC antenna module 10 can also be electrically connected to the motherboard 40 via other structures.

[0076] Figure 4 This is a film layer diagram of a foldable display device provided in an embodiment of this disclosure. See also... Figure 4 The foldable display device also includes a motherboard 40 and a conductive structure 60, with a support plate 20 located between the NFC antenna module 10 and the motherboard 40. The support plate 20 has a through hole 201, and the conductive structure 60 is located within the through hole 201. The NFC antenna module 10 is electrically connected to the motherboard 40 through the conductive structure 60.

[0077] exist Figure 4 In the embodiment shown, a through hole 201 is arranged in the support plate 20, and a conductive structure 60 is arranged in the through hole 201. The NFC antenna module 10 is electrically connected to the motherboard 40 through the conductive structure 60. In this way, the conductive structure 60 can be arranged inside the NFC antenna module 10, eliminating the need to arrange the flexible circuit board 50 on the outside of the NFC antenna module 10, which can reduce the size of the foldable display device.

[0078] In one implementation of this disclosure, the conductive structure 60 is a conductive adhesive, which is formed by directly injecting conductive adhesive into the through hole 201, making the manufacturing process relatively simple.

[0079] Optionally, the conductive structure 60 can be a metal spring or a wire, both of which can achieve electrical connection between the NFC antenna module 10 and the motherboard 40.

[0080] In one implementation of this disclosure, the conductive structure 60 is soldered to the motherboard 40. This ensures a strong electrical connection between the conductive structure 60 and the motherboard 40.

[0081] Optionally, the conductive structure 60 and the motherboard 40 are connected by a pressure bonding adhesive to achieve electrical connection between the conductive structure 60 and the motherboard 40, eliminating the need for soldering and making it more convenient.

[0082] Figure 5 This is a top view of an NFC antenna module electrically connected to a conductive structure according to an embodiment of this disclosure. See also... Figure 5 The antenna feed line 102 is electrically connected to the conductive structure 60, and the antenna coil 101 is electrically connected to the conductive structure 60 through the antenna feed line 102.

[0083] See Figure 3 and Figure 5 The NFC antenna module 10 also includes an antenna substrate 103, which has a groove 131. The shape of the groove 131 is consistent with the shape of the antenna coil 101, and the antenna coil 101 is located within the groove 131. During the fabrication of the NFC antenna module 10, the surface of the antenna substrate 103 is partially etched to form the groove 131, and then the antenna coil 101 is formed within the groove 131. Next, a through-hole is formed on the other surface of the antenna substrate 103 at a position relative to the end of the antenna coil 101 using laser drilling or other drilling processes. Feed metal or conductive metal is then deposited or filled into the through-hole to form a via. Finally, an antenna feed line 102 is formed on the other surface of the antenna substrate 103, allowing the antenna feed line 102 to be electrically connected to the antenna coil 101 through the via.

[0084] In this embodiment of the disclosure, the antenna coil 101 and the antenna feed line 102 are located on two opposite surfaces of the antenna substrate 103. Figure 3 and Figure 5 To clearly illustrate the connection between antenna coil 101 and antenna feed line 102, antenna coil 101 and antenna feed line 102 are drawn on the same surface of antenna substrate 103, such that one of the antenna feed lines 102 is electrically connected to the multi-turn antenna of antenna coil 101. In reality, antenna feed line 102 is only connected to the end of antenna coil 101.

[0085] Optionally, in other implementations, after forming the antenna coil 101 in the antenna substrate 103, an insulating layer is then applied over the antenna coil 101. A via is then formed in the insulating layer at a position relative to the end of the antenna coil 101. Feed metal or a conductive metal is deposited or filled into the via. An antenna feed line 102 is then formed on the insulating layer, such that the antenna feed line 102 is electrically connected to the antenna coil 101 through the via.

[0086] Alternatively, in other implementations, the antenna coil 101 can be printed on the antenna substrate 103, and then the antenna feed line 102 can be formed according to the above method.

[0087] In this embodiment of the disclosure, the antenna substrate 103 may be a polyester resin (PET) substrate or a polyimide (PI) substrate.

[0088] In this embodiment, the insulating layer can be an insulating adhesive layer or a polyimide layer. The insulating layer not only ensures insulation between adjacent coils but also increases the flatness of the surface of the NFC antenna module 10.

[0089] In this embodiment, the support plate 20 supports the display panel 30. The support plate 20 is a metal support plate, which ensures the support performance of the support plate 20. At the same time, metal has good heat dissipation properties, which can dissipate heat from the display panel 30 and prevent the display panel 30 from overheating and being damaged.

[0090] For example, the support plate 20 can be a stainless steel sheet or copper foil.

[0091] See you again Figure 2 and Figure 4 The foldable display device also includes a magnetic layer 70 located between the support plate 20 and the NFC antenna module 10.

[0092] In this embodiment, since the support plate 20 is a metal support plate, the electromagnetic field generated by the NFC antenna module 10 will radiate onto the metal support plate, generating eddy current effects. This leads to disordered magnetic field lines, increased magnetic field loss, and heat generation in the metal support plate, which is detrimental to the performance of the NFC antenna module 10. A magnetically conductive layer 70 is arranged between the support plate 20 and the NFC antenna module 10. The magnetically conductive layer 70 can block electromagnetic waves, preventing the electromagnetic field from radiating onto the metal support plate and generating eddy current effects. This eliminates eddy currents and reduces their impact on the performance of the NFC antenna module 10.

[0093] For example, the material of the magnetic conductive layer 70 is at least one of ferrite, amorphous material, and iron-based nanocrystals. Ferrite, amorphous material, and iron-based nanocrystals can all block electromagnetic waves, ensuring the electromagnetic wave blocking performance of the magnetic conductive layer 70.

[0094] In this embodiment of the disclosure, the NFC antenna module 10 and the magnetic conductive layer 70 can be bonded together by an adhesive layer. Exemplarily, the adhesive layer is an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0095] See you again Figure 2 and Figure 4 The foldable display device also includes a first adhesive layer 80. The first adhesive layer 80 is bonded between the magnetic conductive layer 70 and the support plate 20, and the first adhesive layer 80 bonds the magnetic conductive layer 70 and the support plate 20 together to ensure the stability of the magnetic conductive layer 70.

[0096] For example, the first adhesive layer 80 is an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0097] See you again Figure 2 and Figure 4 The through-hole 201 also passes through the first adhesive layer 80 and the magnetic conductive layer 70 to enable the NFC antenna module 10 to be electrically connected to the motherboard 40.

[0098] See you again Figure 2 and Figure 4 The back film 130 and the NFC antenna module 10 are both located on the non-light-emitting side of the display panel 30, so as to avoid the NFC antenna module 10 affecting the display effect of the foldable display device.

[0099] For example, the supporting back membrane 130 can be a polyethylene (PE) film or a polyimide film.

[0100] See you again Figure 2 and Figure 4 A back film adhesive layer 150 is provided between the display panel 30 and the supporting back film 130, and the display panel 30 and the supporting back film 130 are bonded together by the back film adhesive layer 150.

[0101] For example, the backing adhesive layer 150 can be an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0102] For example, the flexible cover 140 can be an ultra-thin glass cover, ensuring the transparency and flexibility of the flexible cover 140.

[0103] In other implementations, the flexible cover 140 may also be a polyester resin cover, a polyimide cover, a laminated polyester resin cover, or a laminated polyimide cover.

[0104] See you again Figure 2 and Figure 4 The foldable display device also includes a functional module layer 160, which is located between the flexible cover plate 140 and the display panel 30. The functional module layer 160 includes optical films (such as polarizers), touch modules, etc., to ensure that the foldable display device can display images normally and realize touch functions.

[0105] See you again Figure 2 and Figure 4 A module adhesive layer 170 is provided between the functional module layer 160 and the flexible cover plate 140, and the functional module layer 160 and the flexible cover plate 140 are bonded together by the module adhesive layer 170.

[0106] For example, the module adhesive layer 170 can be an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0107] In the embodiments disclosed herein, the display panel 30 is a flexible organic light-emitting diode (OLED) display panel or a quantum dot (QD) display panel, and the support plate 20 is a flexible support plate to achieve the bendable performance of the foldable display device.

[0108] Figure 6 This is a film layer diagram of another foldable display device provided in an embodiment of this disclosure. See also... Figure 1 and Figure 6 The foldable display device includes an NFC antenna module 10, which is located in one of the first planar display areas 11 and the second planar display area 13. Figure 1 and Figure 6 In the foldable display device shown, the NFC antenna module 10 is located in the first planar display area 11. In other implementations, the NFC antenna module 10 may be located in the second planar display area 13. The foldable display device includes an NFC antenna module 10, resulting in a simpler structure. In this case, the foldable display device includes a motherboard 40, which is located in the same planar display area as the NFC antenna module 10. This facilitates electrical connection between the NFC antenna module 10 and the motherboard 40, and also prevents damage to the motherboard 40 due to bending, as it does not pass through the bendable display area 12. Since the motherboard 40 is located in only one planar display area, a gap exists at the motherboard 40. A filling layer 190 is arranged on the layer containing the motherboard 40 to fill this gap and ensure the flatness of the foldable display device.

[0109] For example, the filling layer 190 is a filling foam.

[0110] The bendable and foldable display device provided in this embodiment is an outward-folding bendable and foldable display device, that is, after bending, the flexible cover plate 140 is located on the outer side of the bend. At this time, if NFC interaction is required, the screen side where the first planar display area 11 is located is oriented towards the target device to realize NFC interaction between the foldable display device and the target device.

[0111] Figure 7 yes Figure 6 A schematic diagram of the film layer after the foldable display device is bent. See also... Figure 7During NFC interaction, if the screen side containing the second planar display area 13 faces the target device, simply flip the foldable display device so that the screen side containing the first planar display area 11 faces the target device. This allows for NFC interaction between the foldable display device and the target device. Compared to related technologies that require converting the foldable display device into a planar state before enabling NFC interaction, this method is much simpler.

[0112] Figure 8 This is a schematic diagram showing the location of the NFC antenna module in another foldable display device provided in this embodiment of the disclosure. See also... Figure 8 The foldable display device includes two NFC antenna modules 10. Figure 9 yes Figure 8 A schematic cross-sectional view of the C-plane. See also... Figure 8 and Figure 9 Two NFC antenna modules 10 are located in the first planar display area 11 and the second planar display area 13, respectively. At this time, the foldable display device includes two motherboards 40, each electrically connected to one of the two NFC antenna modules 10, and both motherboards 40 and the electrically connected NFC antenna modules 10 are located in the same planar display area. A filler layer 190 is arranged between the two motherboards 40 to fill any gaps.

[0113] Figure 10 yes Figure 8 A schematic diagram of the film layer after the foldable display device is bent. See also... Figure 10 When the foldable display device is in a bent state, the first planar display area 11 and the second planar display area 13 are opposite each other, with both the screen side containing the first planar display area 11 and the screen side containing the second planar display area 13 being the bent outer side. During NFC interaction, the foldable display device can interact with the target device from either the screen side containing the first planar display area 11 or the screen side containing the second planar display area 13, making operation more convenient.

[0114] like Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, the NFC antenna module 10 is not arranged in the bendable display area 12 of the foldable display device to avoid damage to the NFC antenna module 10 during bending.

[0115] In other implementations, a portion of the NFC antenna module 10 is located within the bendable display area 12.

[0116] See you again Figure 6 , Figure 7 , Figure 9 and Figure 10The foldable display device also includes a second adhesive layer 90 and a third adhesive layer 100. The second adhesive layer 90 is bonded between the NFC antenna module 10 and the supporting back film 130, and the third adhesive layer 100 is bonded between the supporting plate 20 and the supporting back film 130. The surface of the third adhesive layer 100 opposite to the supporting plate 20 is in contact with the supporting plate 20, and the surface of the first adhesive layer 80 opposite to the supporting plate 20 is in contact with the supporting plate 20.

[0117] In this embodiment, the second adhesive layer 90 bonds the NFC antenna module 10 and the display panel 30 together, ensuring the stability of the NFC antenna module 10.

[0118] The absence of an NFC antenna module 10 in the bendable display area 12 of the foldable display device creates a gap between the bendable display area 12 and the first planar display area 11 or the second planar display area 13, affecting the flatness of the foldable display device surface. A third adhesive layer 100 is applied to fill the gap between the first adhesive layer 80 and the second adhesive layer 90, ensuring the flatness of the foldable display device surface.

[0119] for Figures 6 to 7 The foldable display device shown has a third adhesive layer 100 bonded to the first planar display area 11, the bendable display area 12, and the edge where the second planar display area 13 and the bendable display area 12 meet. Figures 8 to 10 The foldable display device shown has a third adhesive layer 100 bonded to the edge where the first planar display area 11 and the bendable display area 12 meet, the bendable display area 12, and the edge where the second planar display area 13 and the bendable display area 12 meet.

[0120] In this embodiment of the disclosure, the difference between the sum of the thickness of the first adhesive layer 80, the thickness of the magnetic conductive layer 70, the thickness of the NFC antenna module 10, and the thickness of the second adhesive layer 90 and the thickness of the third adhesive layer 100 is less than 10 micrometers.

[0121] The difference between the sum of the thicknesses of the first adhesive layer 80, the magnetic conductive layer 70, the NFC antenna module 10, and the second adhesive layer 90 and the thickness of the third adhesive layer 100 is less than 10 micrometers, ensuring that the third adhesive layer 100 fills the gap.

[0122] In this embodiment of the disclosure, the thickness of the first adhesive layer 80 ranges from 15 micrometers to 50 micrometers.

[0123] In this embodiment of the disclosure, the thickness of the magnetically conductive layer 70 ranges from 15 micrometers to 50 micrometers.

[0124] In this embodiment of the disclosure, the thickness of the NFC antenna module 10 ranges from 1 micrometer to 35 micrometers.

[0125] In this embodiment of the disclosure, the thickness of the second adhesive layer 90 ranges from 15 micrometers to 50 micrometers.

[0126] The thickness of the first adhesive layer 80, the magnetic conductive layer 70, the NFC antenna module 10, and the second adhesive layer 90 are limited to ensure the performance of the first adhesive layer 80, the magnetic conductive layer 70, the NFC antenna module 10, and the second adhesive layer 90, while avoiding increasing the thickness of the foldable display device.

[0127] For example, the second adhesive layer 90 is an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0128] For example, the third adhesive layer 100 is an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0129] Since the support plate 20 is a flexible support plate, its support performance will be reduced. Other support structures can be arranged in the foldable display device to support the display panel 30.

[0130] See you again Figure 6 , Figure 7 , Figure 9 and Figure 10 The foldable display device also includes a support structure 110 and a fourth adhesive layer 120. The fourth adhesive layer 120 is bonded between the support structure 110 and the support plate 20.

[0131] In this embodiment, a support structure 110 is arranged to increase the support effect on the display panel 30. At the same time, the support structure 110 and the support plate 20 are bonded together by the fourth adhesive layer 120 to ensure the stability of the support structure 110.

[0132] See you again Figure 6 , Figure 7 , Figure 9 and Figure 10 The support structure 110 has a pivot region 1101 and a planar region 1102, and the fourth adhesive layer 120 is bonded between the planar region 1102 and the support plate 20. That is, the fourth adhesive layer 120 has a cutout 1201, which is opposite to the pivot region 1101.

[0133] Because the foldable display device is bendable, during the bending process, the hinge area 1101 generates a bending force, causing the support structure 110 to deform in the hinge area 1101. The fourth adhesive layer 120 is only used to bond the planar area 1102 of the support structure 110 and the support plate 20. The fourth adhesive layer 120, which is opposite to the hinge area 1101, has a cutout 1201. There is no adhesive in the cutout 1201, making the support structure 110 easier to deform in the hinge area 1101, thus facilitating the bending of the support structure 110.

[0134] In this embodiment of the disclosure, a hinge may be arranged in the pivot region 1101, and both planar regions 1102 rotate around the hinge, thereby realizing the rotation of the support structure 110.

[0135] In this embodiment of the present disclosure, the pivot region 1101 of the support structure 110 may be arranged with hollows or grooves to increase the bendability of the pivot region 1101 of the support structure 110.

[0136] For example, the support structure 110 is a metal support plate. For instance, the support structure 110 is a stainless steel support plate, which ensures both the support performance and the bending performance of the support structure 110.

[0137] For example, the fourth adhesive layer 120 is an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0138] See you again Figure 6 , Figure 7 , Figure 9 and Figure 10 The foldable display device also includes a connecting layer 180, which connects the motherboard 40 and the support structure 110.

[0139] For example, the bonding layer 180 is an optical adhesive layer, a foam adhesive layer, or an acrylic adhesive layer.

[0140] In other implementations, the motherboard 40 and the support structure 110 can also be connected by assembly processes such as riveting, nut connection or welding.

[0141] The foldable display device provided in this disclosure can be a mobile terminal, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, or any other product or component with display function.

[0142] Figure 11 This disclosure provides a method for manufacturing a foldable display device according to an embodiment. See also: Figure 11 The method includes:

[0143] In step 301, a support plate is provided.

[0144] For example, the support plate can be a stainless steel sheet or copper foil.

[0145] In step 302, an NFC antenna module is formed on one surface of the support plate.

[0146] For example, the NFC antenna module includes an antenna coil and an antenna feed line, the antenna feed line being electrically connected to the antenna coil. The trace width of the antenna feed line is greater than the trace width of the antenna coil.

[0147] For example, a third adhesive layer and a first adhesive layer are first applied to one surface of the support plate, the thickness of the third adhesive layer being greater than the thickness of the first adhesive layer; then a magnetic conductive layer is attached to the first adhesive layer; then an NFC antenna module is attached to the magnetic conductive layer; and then a second adhesive layer is attached to the magnetic conductive layer.

[0148] The positions and structures of the third adhesive layer, the first adhesive layer, the magnetic conductive layer, the NFC antenna module, and the second adhesive layer are as described above and will not be repeated here.

[0149] In step 303, a support back film, a display panel, and a flexible cover are sequentially formed on the surface on which the NFC antenna module is formed.

[0150] For example, the display panel is a flexible OLED display panel.

[0151] For example, a support back film is attached to the second adhesive layer and the third adhesive layer; then the display panel is attached to the support back film through the back film adhesive layer.

[0152] For example, the method further includes: attaching a functional module layer to the display panel; then attaching a flexible cover plate to the functional module layer through a module adhesive layer; then applying a fourth adhesive layer to another surface of the support plate, and then bonding the support structure to one surface of the support plate through the fourth adhesive layer; and then attaching the support structure to the motherboard through a connecting layer.

[0153] After attaching the support structure to the motherboard, the motherboard and the NFC antenna module can be electrically connected via a flexible circuit board.

[0154] Alternatively, the motherboard and NFC antenna module can be electrically connected via a conductive structure. In this manufacturing method, before attaching the magnetic layer, support structure, and support plate, through holes must be pre-set in the magnetic layer, support structure, and support plate. When the magnetic layer and support structure are bonded together using the first adhesive layer, the through holes in the support structure and the magnetic layer are interconnected. When the support structure and support plate are bonded together using the fourth adhesive layer, the through holes in the support structure and the support plate are interconnected. After the magnetic layer, support structure, and support plate are attached, a conductive structure is formed in the through holes, enabling the NFC antenna module to be electrically connected to the motherboard.

[0155] The fourth adhesive layer, the supporting structure supporting the back film, the back film adhesive layer, the display panel, the functional module layer, the module adhesive layer, the flexible cover plate, the connecting layer, the motherboard, the flexible circuit board, and the conductive structure are all consistent with the structures described above, and will not be repeated here.

[0156] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A foldable display device, characterized in that, The foldable display device has a first planar display area, a bendable display area, and a second planar display area connected sequentially along a first direction; The foldable display device includes: an NFC antenna module, a magnetic conductive layer, a first adhesive layer, a second adhesive layer, a third adhesive layer, and a stacked support plate, a support back film, a display panel, and a flexible cover plate. The NFC antenna module partially overlaps with at least one of the first planar display areas and the second planar display areas, and at least partially does not overlap with the bendable display area. The NFC antenna module is located between the support plate and the support back film. The support plate is a metal support plate, and the magnetic conductive layer is located between the support plate and the NFC antenna module; the first adhesive layer is bonded between the magnetic conductive layer and the support plate; the second adhesive layer is bonded between the NFC antenna module and the support back film; the third adhesive layer is bonded between the support plate and the support back film, and the opposing surfaces of the third adhesive layer and the support plate, as well as the opposing surfaces of the first adhesive layer and the support plate, are all in contact with the support plate.

2. The foldable display device according to claim 1, characterized in that, The foldable display device also includes a motherboard and a flexible circuit board. The support plate is located between the NFC antenna module and the motherboard. The NFC antenna module is electrically connected to the motherboard through the flexible circuit board.

3. The foldable display device according to claim 2, characterized in that, The trace width of the flexible circuit board is greater than or equal to the trace width of the NFC antenna module.

4. The foldable display device according to claim 3, characterized in that, The trace width of the flexible circuit board ranges from 2 mm to 5 mm, and the trace width of the NFC antenna module ranges from 0.1 mm to 2 mm.

5. The foldable display device according to claim 1, characterized in that, The foldable display device also includes a motherboard and a conductive structure, with the support plate located between the NFC antenna module and the motherboard. The support plate has a through hole, the conductive structure is located in the through hole, and the NFC antenna module is electrically connected to the motherboard through the conductive structure.

6. The foldable display device according to claim 5, characterized in that, The conductive structure is a conductive adhesive; Alternatively, the conductive structure may be a metal spring sheet; Alternatively, the conductive structure may be a wire.

7. The foldable display device according to claim 5, characterized in that, The conductive structure is soldered to the motherboard; Alternatively, the conductive structure can be connected to the motherboard via a pressure bonding adhesive.

8. The foldable display device according to any one of claims 1 to 7, characterized in that, The foldable display device includes an NFC antenna module, which is located in one of the planar display areas of the first planar display area and the second planar display area; Alternatively, the foldable display device may include two NFC antenna modules, which are located in the first planar display area and the second planar display area, respectively.

9. The foldable display device according to any one of claims 1 to 7, characterized in that, The NFC antenna module includes an antenna coil and an antenna feed line, and the antenna feed line is electrically connected to the antenna coil. The trace width of the antenna feed line is greater than the trace width of the antenna coil.

10. The foldable display device according to claim 9, characterized in that, The trace width of the antenna coil ranges from 0.1 mm to 2 mm; The trace width of the antenna feed line ranges from 0.5 mm to 5 mm.

11. The foldable display device according to claim 9, characterized in that, The antenna coil is a copper coil, a silver coil, or an aluminum coil.

12. The foldable display device according to claim 9, characterized in that, The line spacing of the antenna coil is between 0.1 mm and 1 mm, and the inductance of the antenna coil is greater than 0.3 microhenries; The relative permeability of the antenna coil is greater than 150, and the magnetic loss of the antenna coil is less than 100.

13. The foldable display device according to any one of claims 1 to 7 and claims 10 to 12, characterized in that, The material of the magnetic conductive layer is at least one of ferrite, amorphous material and iron-based nanocrystal.

14. The foldable display device according to any one of claims 1 to 7 and claims 10 to 12, characterized in that, The difference between the sum of the thickness of the first adhesive layer, the thickness of the magnetic conductive layer, the thickness of the NFC antenna module, and the thickness of the second adhesive layer and the thickness of the third adhesive layer is less than 10 micrometers.

15. The foldable display device according to any one of claims 1 to 7 and claims 10 to 12, characterized in that, The thickness of the first adhesive layer ranges from 15 micrometers to 50 micrometers, the thickness of the magnetic conductive layer ranges from 15 micrometers to 50 micrometers, the thickness of the NFC antenna module ranges from 1 micrometer to 35 micrometers, and the thickness of the second adhesive layer ranges from 15 micrometers to 50 micrometers.

16. The foldable display device according to any one of claims 1 to 7 and claims 10 to 12, characterized in that, The foldable display device further includes: a support structure and a fourth adhesive layer; The support structure has a pivot area and a planar area, and the fourth adhesive layer is bonded between the planar area and the support plate.

17. A method for manufacturing a foldable display device, characterized in that, The method for manufacturing a foldable display device as described in any one of claims 1 to 16, the method comprising: Provide a support plate; An NFC antenna module is formed on one surface of the support plate; A support back film, a display panel, and a flexible cover are sequentially formed on the surface on which the NFC antenna module is formed.

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