Display module and folding screen terminal

Abstract

This application provides a display module and a foldable screen terminal to solve the problem that existing display modules occupy a large space inside the foldable screen terminal, which adversely affects some performance aspects of the foldable screen terminal. The display module includes a light-transmitting cover, a display panel, and a circuit board. The display panel includes a display section, a bending section, and an electrical connection section. The display section has a display surface, and the electrical connection section is located on the side of the display section opposite to the display surface. The edge of the display section is connected to the electrical connection section through the bending section, and a first bonding area is provided at the edge of the electrical connection section away from the bending section. The circuit board includes a first wiring area, a second wiring area, and a second bonding area distributed along a first direction, wherein the first direction is the distribution direction of the bending section and the electrical connection section. The first wiring area and the second wiring area are respectively connected to both sides of the second bonding area. The second bonding area is fixed to and electrically connected to the first bonding area, and the second wiring area and the electrical connection section are stacked along the thickness direction of the display module.

Description

Technical Field

[0001] This application relates to the field of foldable screen terminal technology, and in particular to a display module and a foldable screen terminal. Background Technology

[0002] With the development of foldable screen terminals (such as mobile phones and tablets), foldable screen terminals are becoming increasingly popular among users because their display modules have a larger display area when unfolded, and their compact size makes them easy to carry when folded.

[0003] However, existing display modules occupy a large space inside foldable screen terminals, excessively encroaching on the space for other components, which in turn adversely affects some performance aspects of the foldable screen terminal. For example, the display module encroaches on the space of the heat sink, requiring a smaller heat sink, resulting in poor heat dissipation performance of the foldable screen terminal. Summary of the Invention

[0004] This application provides a display module and a foldable screen terminal to solve the problem that existing display modules occupy a large space inside the foldable screen terminal, which adversely affects some of the performance of the foldable screen terminal.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a display module, including a light-transmitting cover, a display panel, and a circuit board.

[0007] The display panel includes a display section, a bending section, and an electrical connection section. The display section has a display surface, and the electrical connection section is located on the side of the display section opposite to the display surface. The edge of the display section is connected to the electrical connection section through the bending section, and a first bonding area is provided at the edge of the electrical connection section away from the bending section. The circuit board includes a first trace area, a second trace area, and a second bonding area distributed along a first direction, wherein the first direction is the distribution direction of the bending section and the electrical connection section. The first trace area and the second trace area are respectively connected to both sides of the second bonding area. The second bonding area is fixed and electrically connected to the first bonding area, and the second trace area and the electrical connection section are stacked along the thickness direction of the display module.

[0008] In the internal architecture of foldable screen terminals, to improve space utilization, some components are positioned opposite to the display module's circuit board in the first direction. This means these components and the circuit board share a portion of space in the thickness direction of the foldable screen terminal, but are offset in the direction perpendicular to its thickness. Therefore, the width of the display module's circuit board protruding from the electrical connection portion in the first direction affects the dimensions of these components. The following explanation uses the example of a heat spreader and the display module's circuit board being positioned opposite each other in the first direction.

[0009] The display module provided in the first aspect of this application, by respectively setting the first and second wiring areas of the circuit board on both sides of the second bonding area, and after fixing and electrically connecting the second bonding area to the first bonding area at the edge of the electrical connection portion, the second wiring area of ​​the circuit board and the electrical connection portion of the display panel are stacked along the thickness direction of the display module. That is to say, it is equivalent to extending the circuit board along the first direction towards the side closer to the bending portion, thereby reducing the width of the part of the circuit board on the side of the electrical connection portion away from the bending portion (i.e., the first wiring area) while meeting the wiring requirements. This allows a larger heat dissipation plate to be set on the side of the electrical connection portion away from the bending portion, which is beneficial to improving the heat dissipation performance of the foldable screen terminal.

[0010] In conjunction with the first aspect, in one possible implementation, the second trace area is located on the side of the electrical connection portion away from the display portion. This makes it easier to electrically connect the second bonding area of ​​the circuit board to the first bonding area of ​​the display panel using a thermoforming process by placing the second trace area of ​​the circuit board on the side of the electrical connection portion away from the display portion. Furthermore, electronic components can be placed on the surface of the circuit board's second trace area away from the electrical connection portion, and the height of the electronic components is not limited by the distance between the electrical connection portion and the display portion.

[0011] In conjunction with the first aspect, in another possible implementation, the display module further includes a first electronic component. This first electronic component is disposed on the surface of the electrical connection portion away from the display portion and located on the side of the first bonding area near the bending portion. A clearance opening is provided on the second trace area, penetrating the circuit board along the thickness direction of the display module. The first electronic component is partially located within the clearance opening. Since the first electronic component has a certain height, in the first direction, the second trace area of ​​the circuit board will interfere with the first electronic component. Therefore, by establishing a clearance opening penetrating the circuit board from the second trace area, it avoids interference with the first electronic component, allowing the second trace area to remain attached to the electrical connection portion and extend along the first direction. This arrangement avoids unevenness caused by the second trace area of ​​the circuit board bending above the first electronic component (unevenness in the second trace area makes it difficult to place other electronic components on it), and also avoids squeezing the first electronic component by the second trace area of ​​the circuit board, reducing the risk of damage to the first electronic component. For example, the first electronic component can be a driver chip of the display panel, a surface-mount capacitor, etc.

[0012] In conjunction with the first aspect, in another possible implementation, the first electronic component and the first bonding area are spaced apart. When the first electronic component is a driver chip for a display panel, it is generally fixed to the electrical connection part by adhesive bonding, and the adhesive will form a protective adhesive layer on the outside of the driver chip. In order to prevent the adhesive from flowing onto the first bonding area during the bonding process (the adhesive may cover some pins on the first bonding area, causing poor contact), the first electronic component and the first bonding area are spaced apart to reserve a certain space to accommodate the protective adhesive layer.

[0013] In conjunction with the first aspect, another possible implementation involves setting the clearance opening and the second bonding area at a distance. This prevents damage to the pins within the second bonding area from the cutting tool when the clearance opening is cut into the circuit board, and reduces processing difficulty.

[0014] In conjunction with the first aspect, in another possible implementation, multiple first electronic components are provided, along with multiple clearance openings, each corresponding to one of the multiple electronic components. This allows the second wiring area of ​​the circuit board to specifically avoid each first electronic component on the electrical connection portion of the display panel, preventing the circuit board from squeezing the first electronic components. It also avoids the situation where multiple first electronic components share a single clearance opening, resulting in an excessively large clearance opening and a reduction in the actual usable area for wiring in the second wiring region.

[0015] In conjunction with the first aspect, another possible implementation involves spacing the electrical connection section from the display section. By spacing the electrical connection section from the display section, the curvature of the bending section can be reduced, and the radius of curvature of the bending section can be increased. This prevents damage to the display panel caused by excessive bending angles, such as a broken ribbon cable within the bending section leading to a black screen.

[0016] In conjunction with the first aspect, in another possible implementation, the first wiring area includes a first segment and a second segment distributed along a first direction, with the first segment located between the second bonding area and the second segment. Furthermore, in the thickness direction of the display module, the distance between the second segment and the display unit is less than the distance between the second bonding area and the display unit. This structure is equivalent to bending and arching the first wiring area towards the display unit, thereby utilizing the space occupied by the bent portion and the electrical connection portion in the thickness direction of the display module to accommodate a portion of the circuit board and other components, which is beneficial for improving the component density and space utilization inside the foldable screen terminal.

[0017] In conjunction with the first aspect, another possible implementation involves providing test pins on the second trace area for testing the display panel. This approach, by placing the test pins of the display panel in the second trace area of ​​the circuit board, avoids the test pins occupying the first trace area, thereby reducing the width of the first trace area. This allows for the placement of a larger heat spreader on the side of the first trace area furthest from the second bonding area, improving the heat dissipation performance of the foldable screen terminal.

[0018] In conjunction with the first aspect, in another possible implementation, the display module further includes a second electronic component. The second electronic component is disposed on at least one of the first and second wiring areas, and is located on the surface of the circuit board opposite to the display panel. It is understood that when multiple second electronic components are provided, these components can be the same type of electronic component or multiple types of electronic components. For example, the second electronic component can be a capacitor, resistor, inductor, diode, transistor, control chip, etc.

[0019] In conjunction with the first aspect, in another possible implementation, the second binding area includes a first sub-region that overlaps with the clearance opening in the first direction and a second sub-region that does not overlap with the clearance opening. The second sub-region is provided with a plurality of first pins and a plurality of second pins, with the first pins and second pins located on opposite sides of the second sub-region, respectively.

[0020] The second wiring area is provided with a signal line. One end of the signal line is fixed and electrically connected to at least one first pin, and the other end of the signal line is fixed and electrically connected to at least one second pin. The signal line is routed around to the side of the avoidance opening away from the second binding area.

[0021] In some cases, due to the very small distance between the clearance opening and the second bonding area, it is inconvenient to place signal lines connecting the first and second pins in the portion of the second routing area located between the clearance opening and the second bonding area. Placing the signal lines in the first routing area would increase the width of the first routing area. However, the portion of the second routing area located on the side of the clearance opening furthest from the second bonding area has a larger width; therefore, the signal lines can be routed to the side of the clearance opening furthest from the second bonding area.

[0022] In conjunction with the first aspect, in another possible implementation, the circuit board further includes a board-to-board connector. This board-to-board connector is located at the end of the first trace area away from the second bonding area, and on the surface of the circuit board opposite to the display section. The board-to-board connector facilitates the electrical connection between the display module and the motherboard of the foldable terminal. It should be noted that the board-to-board connector on the circuit board can be a male connector, and correspondingly, the motherboard has a female connector; or, the board-to-board connector on the circuit board can be a female connector, and correspondingly, the motherboard has a male connector. The electrical connection between the circuit board of the display module and the motherboard of the foldable screen terminal can be achieved by mating the male and female connectors.

[0023] In conjunction with the first aspect, in another possible implementation, the circuit board is a flexible circuit board.

[0024] Secondly, this application provides a foldable screen terminal, which includes a housing assembly and the display module described in the first aspect. The display module is mounted on the housing assembly.

[0025] In conjunction with the second aspect, in one possible implementation, the foldable screen terminal also includes a motherboard, a heating element, and a heat spreader located within the housing assembly.

[0026] The circuit board has a first trace area that is electrically connected to the motherboard; a heating element is located on the surface of the motherboard facing the display. A heat spreader is located between the heating element and the display and is attached to the heating element; and in a first direction, the end of the circuit board's first trace area away from the second bonding area is opposite to the heat spreader.

[0027] Understandably, the beneficial effects that the foldable screen terminal can achieve as described in the second aspect and any possible implementation thereof can be referred to as the beneficial effects in the first aspect and any possible implementation thereof, and will not be repeated here. Attached Figure Description

[0028] Figure 1 This application provides a structural diagram of a foldable screen terminal according to an embodiment of the present application.

[0029] Figure 2 for Figure 1 A front view of a foldable screen terminal in its unfolded state;

[0030] Figure 3 for Figure 1 A front view of a foldable screen terminal in its folded state;

[0031] Figure 4 for Figure 1 A schematic diagram of a foldable screen terminal in a semi-folded state;

[0032] Figure 5 for Figure 1 A partial bottom view of the internal structure of a foldable screen terminal;

[0033] Figure 6 for Figure 1 A schematic diagram of a partial cross-section at point AA;

[0034] Figure 7 for Figure 6 A top view showing the connection between the circuit board and the display panel.

[0035] Figure 8 for Figure 6 An exploded view showing the connection relationship between the circuit board and the display panel in the diagram.

[0036] Figure 9 This is a cross-sectional schematic diagram of a display module provided in an embodiment of this application;

[0037] Figure 10 for Figure 9 A partial bottom view of the display module;

[0038] Figure 11 for Figure 10 An exploded view showing the connection relationship between the circuit board and the display panel in the diagram.

[0039] Figure 12 This is a cross-sectional schematic diagram of another display module provided in an embodiment of this application;

[0040] Figure 13 for Figure 12 A partial bottom view of the display module;

[0041] Figure 14 A partial bottom view of a display module provided in an embodiment of this application;

[0042] Figure 15 A partial bottom view of another display module provided in an embodiment of this application;

[0043] Figure 16 for Figure 13 A schematic diagram of the display module's traces on the circuit board;

[0044] Figure 17 for Figure 13 A magnified view of a section at point B in the middle;

[0045] Figure 18 A partial bottom view of another display module provided in an embodiment of this application;

[0046] Figure 19 A partial bottom view of a secondary screen provided in an embodiment of this application;

[0047] Figure 20 A partial bottom view of another sub-screen provided in an embodiment of this application.

[0048] Figure label:

[0049] 01. Foldable screen terminal; 10. Display module; 10a. First display area; 10b. Second display area; 10c. Third display area;

[0050] 11. Translucent cover plate;

[0051] 12. Display panel; 121. Display section; 122. Bending section; 123. Electrical connection section; 123a. First bonding area; 1231. Third sub-area; 1232. Fourth sub-area; 13. Circuit board; 131. First wiring area; 131a. First segment; 131b. Second segment; 132. Second wiring area; 1320. Clearance opening; 1320a. First clearance opening; 1320b. Second clearance opening; 133. Second bonding area; 133a. First sub-area; 133b. Second sub-area; 134. Board-to-board connector; 14. First electronic component; 14a. First driver chip; 14b. Second driver chip; 15. Second electronic component; 16. Test pin; 17. Signal line; 17a. First part; 17b. Second part;

[0052] 20. Housing assembly; 21. Hinge mechanism; 22. Middle frame; 22a. First middle frame; 22b. Second middle frame; 210. First mating surface; 220. Second mating surface; 230. Third mating surface;

[0053] 30. Mainboard; 40. First battery; 50. Secondary screen; 60. Heating element; 70. Heat sink; 80. Second battery. Detailed Implementation

[0054] To make the purpose, technical solution, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0055] In the description of this application, it should be clarified that the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," and "horizontal," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are merely for the convenience of describing this application, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this application. Similarly, the term "quantity" should not be construed as a limitation of this application.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] This application provides a foldable screen terminal, which can be a type of foldable screen terminal with a foldable screen, such as a foldable screen mobile phone. The foldable screen mobile phone can be a mobile phone with an outward-folding display screen or a mobile phone with an inward-folding display screen. The following description uses a mobile phone with an inward-folding display screen as an example of a foldable screen terminal.

[0058] Specifically, please see Figure 1 and Figure 2 As shown, Figure 1 This is a structural diagram of a foldable screen terminal 01 provided in an embodiment of this application. Figure 2 for Figure 1 The above-mentioned foldable screen terminal 01 is a front view (along the positive Y-axis) in the unfolded state. The foldable screen terminal 01 may include a display module 10, a housing assembly 20, a motherboard 30 and a first battery 40. The display module 10 is supported and attached to the housing assembly 20. The housing assembly 20 can drive the display module 10 to rotate between the unfolded state and the folded state. The motherboard 30 and the first battery 40 are disposed inside the housing assembly 20.

[0059] Understandable Figure 1 and Figure 2 The diagram only schematically shows some of the components included in the foldable screen terminal 01. The actual shape, size, position, and structure of the components are not limited by the structure shown in the diagram.

[0060] For ease of description in the following embodiments, an XYZ coordinate system is established. When the foldable screen terminal 01 is in the unfolded state, the width direction of the foldable screen terminal 01 is defined as the X-axis direction, the length direction of the foldable screen terminal 01 as the Y-axis direction, and the thickness direction of the foldable screen terminal 01 as the Z-axis direction. It should be noted that the coordinate system of the foldable screen terminal 01 can be flexibly set according to actual needs. This application only provides an example and should not be considered as constituting a special limitation on this application.

[0061] The aforementioned display module 10 (i.e., foldable screen) can be divided into a first display area 10a, a second display area 10b, and a third display area 10c, with the third display area 10c positioned between the first display area 10a and the second display area 10b. When the foldable screen terminal 01 is in a folded state, the third display area 10c of the display module 10 is bent, and the first display area 10a and the second display area 10b are positioned opposite each other. At least the third display area 10c of the display module 10 can be made of a flexible material, and the first display area 10a and the second display area 10b of the display module 10 can be made of flexible materials, rigid materials, or a combination of both. Therefore, this application does not impose any special limitations in this regard.

[0062] The aforementioned housing assembly 20 is used to protect the internal components of the foldable screen terminal 01. The housing assembly 20 may include a hinge mechanism 21 and a middle frame 22. There are two middle frames 22, namely a first middle frame 22a and a second middle frame 22b, and the hinge mechanism 21 connects the first middle frame 22a and the second middle frame 22b.

[0063] The first mid-frame 22a has a first bonding surface 210, on which the first display area 10a of the display module 10 is supported and bonded. The second mid-frame 22b has a second bonding surface 220, on which the second display area 10b of the display module 10 is supported and bonded. The hinge mechanism 21 has a third bonding surface 230, on which the third display area 10c of the display module 10 is supported and bonded. The first mid-frame 22a and the second mid-frame 22b are rotatably connected by the hinge mechanism 21, so that the foldable screen terminal 01 can rotate and switch between the unfolded state and the folded state.

[0064] With the foldable screen terminal 01 in its unfolded state, please continue to refer to... Figure 1 and Figure 2 As shown, Figure 1 and Figure 2The foldable screen terminal 01 is in an unfolded state. The first bonding surface 210, the second bonding surface 220, and the third bonding surface 230 are on the same plane, allowing the display module 10 to be fully unfolded. That is, the first display area 10a, the second display area 10b, and the third display area 10c of the display module 10 are nearly on the same plane. At this time, the angle between the first display area 10a and the second display area 10b is the first angle, which can be 180°. The angle illustrated in this application is allowed to have slight deviations. For example, the first angle can be 180°, or it can be close to 180°, such as 170°, 175°, 185°, or 190°, etc. Other angles can be understood in the same way later. In this state, the foldable screen terminal 01 can achieve a large-screen display, providing a better user experience.

[0065] When the aforementioned foldable screen terminal 01 is in a folded state, please refer to Figure 3 As shown, Figure 3 for Figure 1 The foldable screen terminal 01 is shown in a front view (along the positive Y-axis) in its folded state. The first display area 10a and the second display area 10b of the aforementioned display module 10 are opposite each other, and the third display area 10c is bent. The housing assembly 20 protects the display module 10, meaning the display module 10 is positioned between the first middle frame 22a and the second middle frame 22b of the housing assembly 20. The first middle frame 22a and the second middle frame 22b can be completely folded to a substantially parallel and stacked state. In this state, the angle between the first display area 10a and the second display area 10b is a second angle, which can be 0°. The angle illustrated in this application allows for slight deviations. For example, the second angle can be 0° or close to 0°, such as -3°, 2°, or 5°. In this state, the display module 10 is invisible to the user, preventing scratches or damage and thus providing effective protection for the display module 10. For example, when not using the phone, the terminal can be folded to avoid screen damage.

[0066] When the foldable screen terminal 01 is in a semi-folded state, please refer to Figure 4 As shown, Figure 4 for Figure 1 The diagram shows the foldable screen terminal 01 in a semi-folded state. The angle between the first display area 10a and the second display area 10b is the third angle, which can be any angle value between the first angle and the second angle.

[0067] In some embodiments, please refer back to the previous section. Figure 3As shown, the foldable screen terminal 01 may further include a secondary screen 50 (also known as an outer screen), which is a flat screen and is located on the side of the second middle frame 22b away from the display module 10. When the foldable screen terminal 01 is in a folded state, the secondary screen 50 can be used to display images, allowing users to operate the device with one hand, thus diversifying the usage scenarios of the foldable screen terminal 01 and further improving the user experience. For example, when a user's App (Application) account receives a message, the foldable screen terminal 01 can display a message pop-up on the secondary screen 50, allowing the user to see the message content through the secondary screen 50 without having to unfold the foldable screen terminal 01 again.

[0068] The aforementioned motherboard 30 is used to set up the electronic components of the foldable screen terminal 01 and to realize the electrical connection between the electronic components. For example, the electronic components can be control chips (such as system-on-chips, SOCs), graphics processing units (GPUs), universal flash storage (UFS), etc. The first battery 40 is electrically connected to the motherboard 30 and is used to supply power to the aforementioned electronic components and other active devices (such as camera modules, flash, speakers, the aforementioned display module 10, etc.).

[0069] It is understood that the motherboard 30 and the first battery 40 can be disposed within the first accommodating space enclosed by the first display area 10a and the first middle frame 22a of the display module 10, or the motherboard 30 and the first battery 40 can be disposed within the second accommodating space enclosed by the second display area 10b and the second middle frame 22b of the display module 10. This application does not impose any special limitations on this. For ease of understanding, the following examples are all described with the motherboard 30 and the first battery 40 both located within the first accommodating space enclosed by the first display area 10a and the first middle frame 22a, that is, the motherboard 30 and the first battery 40 are located inside the first middle frame 22a.

[0070] The following is a detailed description of the display module 10.

[0071] Please see Figure 5 and Figure 6 As shown, Figure 5 for Figure 1 A partial bottom view (along the positive Z-axis) of the internal structure of a foldable screen terminal. Figure 6 for Figure 1A partial cross-sectional view at point AA. The display module 10 may include a light-transmitting cover plate 11 and a display panel 12. The light-transmitting cover plate 11 and the display panel 12 are stacked along the Z-axis direction and are bonded and fixed together by optical adhesive (OCA).

[0072] The aforementioned display panel 12 can be an organic light-emitting diode (OLED) display panel, an active-matrix organic light-emitting diode (AMOLED) display panel, a mini organic light-emitting diode (MLED) display panel, a micro organic light-emitting diode (MOLED) display panel, a quantum dot light-emitting diode (QLED) display panel, a liquid crystal display (LCD) panel, etc.

[0073] Specifically, the display panel 12 may include a display section 121, a bending section 122, and an electrical connection section 123. The display section 121 is stacked with the light-transmitting cover plate 11, and the display surface of the display section 121 faces the light-transmitting cover plate 11. The electrical connection section 123 is located on the side of the display section 121 away from the light-transmitting cover plate 11. The bending section 122 and the electrical connection section 123 are distributed along a first direction (i.e., the width direction of the foldable screen terminal 01, which is also the X-axis direction). The electrical connection section 123 is connected to the edge of the display section 121 through the bending section 122.

[0074] The bending portion 122 and the electrical connection portion 123 can be integral components independent of the display portion 121. For example, the bending portion 122 and the electrical connection portion 123 can be two parts of a flexible printed circuit (FPC). The flexible printed circuit is fixed to the edge of the display portion 121 and electrically connected to the display portion 121. The flexible printed circuit is bent to the side away from the display surface of the display portion 121. Alternatively, the display portion 121, the bending portion 122, and the electrical connection portion 123 can also be an integral structure, that is, the display portion 121 uses a flexible screen, and the edge of the display portion 121 is bent to the side away from the display surface to form the bending portion 122 and the electrical connection portion 123.

[0075] The electrical connection portion 123 can be attached to the display portion 121 or spaced apart from it; this application does not impose any particular limitation on this. When the electrical connection portion 123 is spaced apart from the display portion 121, the curvature of the bending portion 122 can be reduced and the radius of curvature of the bending portion 122 can be increased, thereby preventing damage to the display panel 12 due to excessive bending angle of the bending portion 122, such as a broken ribbon cable inside the bending portion 122 causing a black screen. The following are examples illustrating the situation where the electrical connection portion 123 is spaced apart from the display portion 121.

[0076] It should be noted that, Figure 5 and Figure 6 The illustration only shows some of the components included in the display module 10. The actual shape, size, position, and construction of these components are not subject to change. Figure 5 and Figure 6 The limitations. Additionally. Figure 5 and Figure 6 coordinate system and Figure 1 The coordinate systems in the text are represented by the same coordinate system. That is, Figure 5 and Figure 6 The various components within the display module 10 are in Figure 1 The orientation relationship in the coordinate system shown is related to the orientation relationship when the display module 10 is applied. Figure 1 When the foldable screen terminal 01 shown is inside, its internal components are... Figure 5 and Figure 6 The orientation relationships are the same in the coordinate system shown.

[0077] Circuit board 13 is used to realize the electrical connection between display module 10 and motherboard 30. Circuit board 13 can be a rigid circuit board or a flexible circuit board, as long as it can realize the electrical connection between display module 10 and motherboard 30, this application does not make any special limitation. For ease of understanding, the following are all examples assuming that circuit board 13 is a flexible circuit board.

[0078] For details, please continue to see Figure 6 and combined Figure 7 and Figure 8 As shown, Figure 7 for Figure 6 A top view (along the positive Z-axis) showing the connection between the circuit board 13 and the display panel 12. Figure 8 for Figure 6An exploded view showing the connection relationship between the circuit board 13 and the display panel 12. The circuit board 13 has a first end and a second end distributed along the X-axis. A second bonding area 133 (with multiple arrayed pins) is provided at the edge of the first end of the circuit board 13. A first bonding area 123a (with multiple arrayed pins) is provided at the edge of the electrical connection portion 123 of the display panel 12 away from the bending portion 122. The first bonding area 123a of the circuit board 13 is electrically connected to the second bonding area 133 of the display panel 12 (i.e., the pins in the first bonding area 123a are correspondingly connected to the pins in the second bonding area 133). The second end of the circuit board 13 is electrically connected to the main board 30 of the foldable screen terminal 01.

[0079] In some embodiments, please continue to see Figure 5 and Figure 6 As shown, the second end of the circuit board 13 may also be provided with a board-to-board connector 134 (BTB), which enables electrical connection between the circuit board 13 and the motherboard 30. It can be understood that the board-to-board connector 134 on the circuit board 13 can be a male connector, and correspondingly, the motherboard 30 has a female connector; or, the board-to-board connector on the circuit board 13 can be a female connector, and correspondingly, the motherboard 30 has a male connector. Electrical connection between the circuit board 13 and the motherboard 30 of the display module 10 can be achieved by mating the male and female connectors.

[0080] Since the electronic components on the motherboard 30 generate heat during operation, these heat-generating electronic components can also be referred to as heat-generating elements 60. To reduce the risk of damage to the heat-generating elements 60 due to overheating, the aforementioned foldable screen terminal may also include a vapor chamber 70 (VC), which is used to dissipate heat and cool the heat-generating elements 60.

[0081] Specifically, the motherboard 30 and the first battery 40 are distributed along the length direction (Y-axis direction) of the folding screen terminal 01 on the inner side of the first middle frame 22a. The heating element 60 is disposed on the surface of the motherboard 30 facing the display panel 12. The heat dissipation plate 70 is disposed between the heating element 60 and the display part 121, and the heat dissipation plate 70 is attached to the heating element 60.

[0082] In order to improve the space utilization inside the foldable screen terminal 01, the heat dissipation plate 70 and the circuit board 13 of the display module 10 generally share a part of the space in the thickness direction (Z-axis direction) of the foldable screen terminal 01, while the two are staggered in the X-axis direction. That is, in the X-axis direction, the circuit board 13 and the heat dissipation plate 70 are opposite to each other and spaced apart.

[0083] Please continue reading Figure 6 As shown, since the width d1 of the portion of the circuit board 13 protruding from the electrical connection portion 123 in the X-axis direction is relatively large, while the width of the first accommodating space in the first middle frame 22a in the X-axis direction is limited, only a small heat dissipation plate 70 can be arranged between the circuit board 13 and the first middle frame 22a, resulting in poor heat dissipation performance of the foldable screen terminal 01.

[0084] To address the aforementioned issues, this application provides a display module 10. Please refer to [link to relevant documentation]. Figure 9 , Figure 10 and Figure 11 As shown, Figure 9 This is a cross-sectional schematic diagram of a display module 10 provided in an embodiment of this application. Figure 10 for Figure 9 A partial bottom view (along the positive Z-axis) of display module 10. Figure 11 for Figure 10 An exploded view showing the connection relationship between the circuit board 13 and the display panel 12.

[0085] The display module 10 may include the aforementioned light-transmitting cover plate 11, the aforementioned display panel 12, and the circuit board 13. The display panel 12 includes a display part 121, a bending part 122, and an electrical connection part 123. The display part 121 is stacked with the light-transmitting cover plate 11. The electrical connection part 123 is located on the side of the display part 121 away from the light-transmitting cover plate 11 and is spaced apart from the display part 121. The bending part 122 and the electrical connection part 123 are distributed along the width direction (X-axis direction) of the foldable screen terminal 01. The display part 121 and the electrical connection part 123 are connected through the bending part 122, and a first binding area 123a is provided on the edge of the electrical connection part 123 away from the bending part 122.

[0086] The circuit board 13 includes a first wiring area 131, a second wiring area 132, and a second bonding area 133 distributed along the X-axis direction. The first wiring area 131 and the second wiring area 132 are respectively connected to both sides of the second bonding area 133. The second bonding area 133 is electrically connected to the first bonding area 123a. The second wiring area 132 and the electrical connection part 123 are stacked along the thickness direction (Z-axis direction) of the display module 10. A board-to-board connector 134 is provided at the end of the first wiring area 131 away from the second bonding area 133.

[0087] In this way, the aforementioned display module 10 is equivalent to extending the circuit board 13 along the X-axis direction towards the side closer to the bending portion 122. This allows the circuit board 13 to reduce the width d1 of the portion of the circuit board 13 protruding from the electrical connection portion 123 (i.e., the first wiring area 131) in the X-axis direction while meeting the wiring requirements. This allows for the placement of a larger heat dissipation plate 70 between the circuit board 13 and the first middle frame 22a, which is beneficial for improving the heat dissipation performance of the foldable screen terminal 01.

[0088] It is understood that the second trace area 132 of the circuit board 13 can be located between the electrical connection portion 123 of the display panel 12 and the display portion 121, or it can be located on the side of the electrical connection portion 123 away from the display portion 121, as long as the width d1 of the first trace area 131 of the circuit board 13 in the X-axis direction is reduced. This application does not impose any special limitation on this. For ease of understanding, the following examples all use the second trace area 132 being located on the side of the electrical connection portion 123 away from the display portion 121 as an example.

[0089] When the second wiring area 132 is located on the side of the electrical connection portion 123 facing away from the display portion 121, it is easier to electrically connect the second bonding area 133 of the circuit board 13 to the first bonding area 123a of the display panel 12 using a thermoforming process. Furthermore, some electronic components can be placed on the surface of the second wiring area 132 of the circuit board 13 facing away from the electrical connection portion 123, and the height of these electronic components is not limited by the distance between the electrical connection portion 123 and the display portion 121.

[0090] Furthermore, after the first binding area 123a and the second binding area 133 are electrically connected, the first wiring area 131 can first be bent and arched towards the side closer to the display unit 121, and then extend along the X-axis direction to be electrically connected to the motherboard 30, thereby making room for other devices.

[0091] For details, please continue to see Figure 9 As shown, the first wiring area 131 may include a first segment 131a and a second segment 131b distributed along a first direction (X-axis direction), with the first segment 131a located between the second bonding area 133 and the second segment 131b. Furthermore, in the Z-axis direction, the distance h1 between the second segment 131b and the display unit 121 is less than the distance h2 between the second bonding area 133 and the display unit 121. In this way, the space occupied by the bending portion 122 and the electrical connection portion 123 in the thickness direction (Z-axis direction) of the display module 10 is utilized to accommodate a portion of the circuit board 13 and other components (such as the aforementioned heat spreader 70, heating element 60, first battery 40, etc.), thereby improving the component density and space utilization inside the foldable screen terminal 01, which is beneficial for the thinning and lightening of the foldable screen terminal 01.

[0092] In some embodiments, see Figure 12 and Figure 13 As shown, Figure 12 This is a cross-sectional schematic diagram of another display module 10 provided in an embodiment of this application. Figure 13 for Figure 12A partial bottom view (along the positive Z-axis) of the display module 10. The display module 10 may also include a first electronic component 14 (the first electronic component 14 may be a driving chip of the display panel 12, a surface-mount capacitor, etc.), the first electronic component 14 is disposed on the surface of the electrical connection portion 123 away from the display portion 121, and is located on the side of the first bonding area 123a near the bending portion 122.

[0093] Since the first electronic component 14 has a certain height, the second trace area 132 of the circuit board 13 may interfere with the first electronic component 14 in the X-axis direction. Therefore, the second trace area 132 is also provided with a clearance opening 1320 that extends through the circuit board 13 along the thickness direction (Z-axis direction) of the display module 10, and the first electronic component 14 is partially located within the clearance opening 1320. It should be noted that the first electronic component 14 being partially located within the clearance opening 1320 includes the following two situations: the end of the first electronic component 14 away from the electrical connection part 123 can be located within the clearance opening 1320, or it can extend from the surface of the second trace area 132 away from the electrical connection part 123 into the clearance opening 1320. This application does not make any special limitation on this.

[0094] By creating a clearance opening 1320 that extends through the circuit board 13 from the second wiring area 132, the second wiring area 132 avoids the first electronic component 14. This allows the second wiring area 132 to remain attached to the electrical connection portion 123 and extend along the X-axis. This arrangement avoids the second wiring area 132 of the circuit board 13 from becoming bent and uneven due to its route around the first electronic component 14 (uneven bending of the second wiring area 132 makes it inconvenient to place other electronic components on the second wiring area 132). It also avoids the second wiring area 132 of the circuit board 13 from squeezing the first electronic component 14, reducing the risk of damage to the first electronic component 14.

[0095] It is understood that the shape of the clearance opening 1320 and its specific position on the second wiring area 132 can be adjusted according to the shape of the first electronic component 14 and the position of the first electronic component 14 on the electrical connection portion 123. This application does not impose any special limitations on this.

[0096] For example, please continue to see Figure 13 As shown, Figure 13 In this circuit board 13, the first electronic component 14 is rectangular and located in the middle of the electrical connection portion 123, meaning that the first electronic component 14 is spaced apart from the first bonding area 123a. Correspondingly, the clearance opening 1320 on the second trace area 132 of the circuit board 13 is also rectangular, with a cross-section (parallel to the XY plane) slightly larger than the first electronic component 14. The clearance opening 1320 is also located in the middle of the second trace area 132 and is spaced apart from the second bonding area 133.

[0097] At this point, the opening 1320 is circumferentially closed within the cross-section perpendicular to the Z-axis (i.e., parallel to the XY plane). In other words, the second trace area 132 of the circuit board 13 is arranged around the first electronic component 14 in a plane parallel to the XY plane. Thus, when the thickness of the circuit board 13 along the Z-axis is close to the height of the first electronic component 14 along the Z-axis, its second trace area 132 can still provide some protection for the first electronic component 14.

[0098] For example, please see Figure 14 As shown, Figure 14 This is a partial bottom view (along the positive Z-axis) of a display module 10 provided in an embodiment of this application. A first electronic component 14 is spaced apart from a first bonding area 123a, and... Figure 14 In the indicated orientation, the first electronic component 14 extends to the right edge of the electrical connection portion 123. Correspondingly, the clearance opening 1320 on the second trace area 132 of the circuit board 13 is spaced apart from the second bonding area 133 and extends to the right edge of the second trace area 132. At this time, in the plane parallel to the XY plane, the clearance opening 1320 is not circumferentially closed, and its right side is open.

[0099] Furthermore, multiple first electronic components 14 can be provided, and correspondingly, multiple clearance openings 1320 are also provided, with each clearance opening 1320 corresponding to one of the multiple electronic components. In this way, the second wiring area 132 of the circuit board 13 can specifically avoid each first electronic component 14 on the electrical connection portion 123 of the display panel 12, preventing the circuit board 13 from squeezing the first electronic component 14. It also avoids the situation where multiple first electronic components 14 share a single clearance opening 1320, resulting in an excessively large clearance opening 1320 and thus a small actual usable area for wiring in the second wiring area 132.

[0100] For example, please see Figure 15 As shown, Figure 15 This is a partial bottom view (along the positive Z-axis) of another display module 10 provided in an embodiment of this application. Two first electronic components 14 are provided: a first driving chip 14a and a second driving chip 14b. The first driving chip 14a and the second driving chip 14b are spaced apart along a second direction, wherein the second direction is perpendicular to the first direction and the thickness direction of the foldable screen terminal, i.e., the second direction is the Y-axis direction. Both the first driving chip 14a and the second driving chip 14b are spaced apart from the first bonding area 123a and are electrically connected to the first bonding area 123a via transmission lines embedded in the electrical connection portion 123.

[0101] There are two clearance openings 1320, namely a first clearance opening 1320a and a second clearance opening 1320b. The first driving chip 14a extends into the first clearance opening 1320a, and the second driving chip 14b extends into the second clearance opening 1320b.

[0102] Based on the above, the display module 10 may further include a second electronic component 15, which is disposed on the surface of the circuit board 13 opposite to the display panel 12. The second electronic component 15 may be as follows: Figure 13 It is located on the first trace area 131 of the circuit board 13, or it can be like Figure 14 The second electronic component 15 is located on the second trace area 132 of the circuit board 13, or it can be located on the second trace area 132 of the circuit board 13. Figure 15 Multiple second electronic components 15 are provided in the circuit board 13, and the circuit board 13 is distributed in the first trace area 131 and the second trace area 132. This application does not make any special limitation on this.

[0103] For example, the second electronic component 15 can be a capacitor, resistor, inductor, diode, transistor, control chip, etc.

[0104] It should be noted that when there are multiple second electronic components 15, the multiple second electronic components 15 can be the same type of electronic component or multiple different electronic components.

[0105] When the second electronic component 15 is the control chip of the display module 10, taking a touch control chip (hereinafter referred to as a touch chip) as an example, the display panel 12 is provided with a signal transmitting network for sending output signals from the touch chip (i.e., the second electronic component 15) and a signal receiving network for receiving input signals from the touch chip. It is understood that one or more signal transmitting networks can be provided. One or more signal receiving networks can also be provided; this application does not impose any special limitations on this. The following will use the above... Figure 13 The connection relationship between the signal receiving network of the second electronic component 15 and the circuit board 13 will be introduced as an example.

[0106] To ensure the uniformity of the display module 10, so that the touch chip (i.e. the second electronic component 15) can receive input signals from various positions on the display panel 12, each signal receiving network has multiple pins, and the multiple pins are distributed on the first bonding area 123a.

[0107] For example, the signal receiving network has multiple third pins and multiple fourth pins. See also... Figure 16 As shown, Figure 16 for Figure 13The diagram shows the routing of the display module 10 on the circuit board 13. Specifically, the first bonding area 123a includes a third sub-region 1231 that overlaps with the first electronic component 14 in the first direction (X-axis direction), and a fourth sub-region 1232 that does not overlap with the first electronic component 14. The fourth sub-region 1232 contains multiple third pins (…). Figure 16 (not shown in the image) and multiple fourth pins ( Figure 16 (not shown in the image), and in Figure 16 In the orientation shown, multiple third pins are located in the fourth sub-region 1232 on the left, and multiple fourth pins are located in the fourth sub-region 1232 on the right. The multiple third pins and multiple fourth pins are connected to the same signal receiving network.

[0108] The second binding area 133 includes a first sub-region 133a that overlaps with the clearance opening 1320 in the first direction (X-axis direction), and a second sub-region 133b that does not overlap with the clearance opening 1320. The second sub-region 133b contains a plurality of first pins ( Figure 16 (not shown in the image) and multiple second pins ( Figure 16 (not shown in the image), and in Figure 16 In the orientation shown, multiple first pins are located in the second sub-region 133b on the left, and multiple second pins are located in the second sub-region 133b on the right. Multiple third pins correspond one-to-one with the multiple first pins and are fixedly electrically connected, and multiple fourth pins correspond one-to-one with the multiple second pins and are fixedly electrically connected.

[0109] Furthermore, to save routing space on circuit board 13, multiple first pins and multiple second pins need to be connected to the touch chip (i.e., the second electronic component 15) via the same signal line 17. The signal line 17 includes a first portion 17a and a second portion 17b. The first portion 17a is located in the first routing area 131, with one end connected to the second electronic component 15 and the other end connected to at least one first pin. The second portion 17b is located in the second routing area 132, with one end connected to at least one third pin and the other end connected to at least one fourth pin.

[0110] Please see Figure 17 As shown, Figure 17 for Figure 13In the enlarged view at point B, the distance d2 between the avoidance opening 1320 and the boundary between the second binding area 133 and the first wiring area 131 in the X-axis direction is small, generally around 1.8mm. Of this, the width d3 of the second binding area 133 occupies approximately 1.2mm. Therefore, the distance between the avoidance opening 1320 and the second binding area 133 is very small, making it inconvenient to place the second portion 17b of the signal line 17 on the portion of the second wiring area 132 located between the avoidance opening 1320 and the second binding area 133. If the second portion 17b of the signal line 17 is placed in the first wiring area 131, it will increase the width of the first wiring area 131 in the X-axis direction, thus encroaching on the heat spreader 70. Figure 17 The arrangement space (not shown in the image).

[0111] In this regard, such as Figure 16 As shown, the second part 17b of the signal line 17 can be routed around the clearance opening 1320 to the side away from the second binding area 133, thereby avoiding an increase in the width of the first wiring area 131, which is beneficial to ensuring the heat dissipation performance of the foldable screen terminal 01.

[0112] For further details, please see Figure 18 As shown, Figure 18 A partial bottom view (along the positive Z-axis) of another display module 10 provided in this application embodiment. Test pins 16 for testing the display panel 12 can also be placed on the second trace area 132 of the circuit board 13. This avoids the test pins 16 occupying the first trace area 131 of the circuit board 13, thereby reducing the width of the first trace area 131 in the X-axis direction, and allowing a larger heat spreader 70 to be placed on the side of the first trace area 131 away from the second bonding area 133. Figure 18 (Not shown in the image), which helps improve the heat dissipation performance of the foldable screen terminal 01.

[0113] In some embodiments, the structural design of the display module 10 (i.e., the foldable screen) described above can also be applied to the secondary screen 50.

[0114] Please return to the previous page. Figure 3 , and in conjunction with see Figure 19 As shown, Figure 19 This is a partial bottom view (along the positive Z-axis) of a sub-screen 50 provided in an embodiment of this application. The sub-screen 50 is disposed on the side of the second middle frame 22b opposite to the display module 10. The sub-screen 50, the second middle frame 22b, and the second display area 10b of the display module 10 form a second accommodating space.

[0115] The foldable screen terminal 01 may also include a second battery 80, which is located within a second accommodating space.

[0116] The secondary screen 50 may include a light-transmitting cover 11, a display panel 12, and a circuit board 13. After the secondary screen 50 is assembled onto the second middle frame 22b, the second battery 80 and the circuit board 13 of the secondary screen 50 share a portion of space in the thickness direction (Z-axis direction) of the foldable screen terminal 01, that is, in the Y-axis direction, the circuit board 13 of the secondary screen 50 and the second battery 80 are opposite to each other and spaced apart.

[0117] For the components of the display panel 12 of the secondary screen 50 and the connection relationship between each part, please refer to the aforementioned display module 10, which will not be repeated here.

[0118] The main difference between the secondary screen 50 and the aforementioned display module 10 is that the bending portion 122 and the electrical connection portion 123 of the secondary screen 50 are distributed along the length direction (Y-axis direction) of the folding screen terminal 01.

[0119] Correspondingly, the first routing area 131, the second routing area 132, and the second bonding area 133 of the circuit board 13 of the secondary screen 50 are also distributed along the Y-axis direction. Specifically, the first routing area 131 and the second routing area 132 of the circuit board 13 of the secondary screen 50 are located on both sides of the second bonding area 133 along the Y-axis direction. The second bonding area 133 is electrically connected to the first bonding area 123a. A board-to-board connector 134 is provided at the end of the first routing area 131 away from the second bonding area 133. Furthermore, in the thickness direction (Z-axis direction) of the display module 10, the second routing area 132 is opposite to the electrical connection part 123.

[0120] In this way, the aforementioned display module 10 is equivalent to extending the circuit board 13 of the secondary screen 50 along the Y-axis towards the side of the bending portion 122. This allows the circuit board 13 to reduce the width d4 of the portion of the circuit board 13 of the secondary screen 50 located on the side of the electrical connection portion 123 away from the bending portion 122 (i.e., the first wiring area 131) while meeting the wiring requirements. This allows a larger and higher-capacity second battery 80 to be installed between the circuit board 13 and the second middle frame 22b, thereby improving the battery life of the foldable screen terminal 01.

[0121] In addition, please see Figure 20 As shown, Figure 20 This is a partial bottom view (along the positive Z-axis) of another sub-screen 50 provided in an embodiment of this application. Referring also to the aforementioned structural design of the display module 10 (i.e., the foldable screen), the first electronic component 14 of the sub-screen 50 (e.g., the driver chip of the sub-screen 50) can be disposed on its electrical connection portion 123, and a clearance opening 1320 can be opened in the second wiring area 132 of its circuit board 13. And / or, the second electronic component 15 of the sub-screen 50 (e.g., the control chip of the sub-screen 50), test pins 16, etc., can be disposed on the second wiring area 132 of its circuit board 13, etc., which will not be elaborated further here.

[0122] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0123] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display module for use in a foldable screen terminal, characterized in that, include: The display panel includes a display part, a bending part, and an electrical connection part. The display part has a display surface. The electrical connection part is located on the side of the display part away from the display surface. The edge of the display part is connected to the electrical connection part through the bending part. The electrical connection part has a first bonding area at the edge position away from the bending part. A circuit board, the circuit board including a first trace area, a second trace area and a second bonding area distributed along a first direction, wherein the first direction is the distribution direction of the bent portion and the electrical connection portion; The first wiring area and the second wiring area are respectively connected to both sides of the second binding area. The second binding area is fixed and electrically connected to the first binding area. The second wiring area and the electrical connection part are stacked along the thickness direction of the display module.

2. The display module according to claim 1, characterized in that, The second wiring area is located on the side of the electrical connection portion away from the display portion.

3. The display module according to claim 2, characterized in that, The display module further includes a first electronic component, which is disposed on the surface of the electrical connection portion away from the display portion and located on the side of the first bonding area near the bending portion; The second wiring area is provided with a clearance opening, which extends through the circuit board along the thickness direction of the display module, and the first electronic component portion is located within the clearance opening.

4. The display module according to claim 3, characterized in that, The first electronic component is spaced apart from the first bonding area.

5. The display module according to claim 3 or 4, characterized in that, The clearance opening is spaced apart from the second binding area.

6. The display module according to any one of claims 3 to 5, characterized in that, The first electronic component is provided in multiple ways, and the clearance opening is provided in multiple ways, with each clearance opening corresponding to one of the multiple electronic components.

7. The display module according to any one of claims 1 to 6, characterized in that, The electrical connection portion is spaced apart from the display portion.

8. The display module according to claim 7, characterized in that, The first wiring area includes a first segment and a second segment distributed along the first direction, wherein the first segment is located between the second binding area and the second segment; Furthermore, in the thickness direction of the display module, the distance between the second segment and the display part is less than the distance between the second binding area and the display part.

9. The display module according to any one of claims 1 to 8, characterized in that, The second trace area is provided with test pins, which are used to test the display panel.

10. The display module according to any one of claims 1 to 9, characterized in that, The display module further includes a second electronic component, which is provided on at least one of the first wiring area and the second wiring area, and the second electronic component is located on the surface of the circuit board away from the display panel.

11. The display module according to any one of claims 1 to 10, characterized in that, The second binding area includes a first sub-region that overlaps with the clearance opening in the first direction and a second sub-region that does not overlap with the clearance opening; the second sub-region is provided with a plurality of first pins and a plurality of second pins, the first pins and the second pins being located on both sides of the second sub-region respectively; The second wiring area is provided with a signal line. One end of the signal line is fixed and electrically connected to at least one first pin, and the other end of the signal line is fixed and electrically connected to at least one second pin. The signal line is routed around to the side of the avoidance opening away from the second binding area.

12. The display module according to any one of claims 1 to 11, characterized in that, The circuit board also includes a board-to-board connector, which is located at the end of the first trace area away from the second bonding area and on the surface of the circuit board opposite to the display section.

13. The display module according to any one of claims 1 to 12, characterized in that, The circuit board is a flexible circuit board.

14. A foldable screen terminal, characterized in that, include: Housing assembly; The display module is the display module according to any one of claims 1 to 13, and the display module is mounted on the housing assembly.

15. The foldable screen terminal according to claim 14, characterized in that, The foldable screen terminal also includes a component disposed within the housing assembly: The motherboard, wherein the first trace area of ​​the circuit board is electrically connected to the motherboard; A heating element is disposed on the surface of the motherboard facing the display unit; A heat spreader is located between the heating element and the display unit and is attached to the heating element; and in the first direction, the end of the first trace area of ​​the circuit board away from the second bonding area is opposite to the heat spreader.

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