Foldable display screen, display module and electronic device

Abstract

This application provides a foldable display screen, a display module, and an electronic device, relating to the field of terminal technology. The foldable display screen includes a secondary foldable screen and a primary foldable screen. The secondary foldable screen has at least one inner screen. The primary foldable screen and the secondary foldable screen are located on opposite sides of a folding edge, sharing the same folding edge. The primary foldable screen includes a main screen, a mid-frame, and at least one display driver. In the folded state, the primary screen faces one inner screen. In the unfolded state, the primary screen and all inner screens are on the same plane. The mid-frame and the display driver are both located on the backlight side of the primary screen. An accommodating space exists between the backlight side of the primary screen and a portion of the mid-frame. The display driver is located within this accommodating space and is electrically connected to the primary screen. The display driver controls the primary screen and the inner screens. By placing at least one display driver in the primary foldable screen, trace length is reduced, insertion loss is lowered, and eye diagram quality is improved.

Description

Technical Field

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

[0002] With the development of technology, most electronic devices have displays, and as displays become more powerful, their sizes need to increase accordingly. However, if the display size is too large, it will make it difficult for users to carry the electronic devices.

[0003] Foldable screen electronic devices have emerged on the market, which use multiple screens to achieve larger sizes and more powerful functions. At the same time, foldable screen electronic devices become smaller in size after being folded, making them easy to carry.

[0004] The display driver controls the screen in electronic devices. The current placement of the display driver often leads to these problems: the screen traces are long, which may increase impedance abruptness when passing through multiple board-to-board connectors, affecting signal quality. In addition, the display driver may occupy the space for the battery, resulting in a reduction in battery capacity and poor battery life of electronic devices, thus causing poor overall performance of electronic devices. Summary of the Invention

[0005] This application provides a foldable display screen, a display module, and an electronic device. By placing at least one display driver in the main foldable screen, the wiring length of the foldable display screen is effectively reduced without significantly increasing the thickness of the foldable display screen. This reduces insertion loss, improves eye diagram quality, makes reasonable use of the overall system resources, and greatly enhances the performance of the foldable display screen.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, a foldable display screen is provided, comprising a secondary foldable screen and a primary foldable screen. The secondary foldable screen has at least one inner screen. The primary foldable screen and the secondary foldable screen are located on opposite sides of a folding edge and share the same folding edge. The primary foldable screen comprises a main screen, a mid-frame, and at least one display driver. In the folded state of the foldable display screen, the primary screen faces one inner screen. In the unfolded state of the foldable display screen, the primary screen and all inner screens are on the same plane. The mid-frame and the display driver are both disposed on the backlight side of the primary screen. There is an accommodating space between the backlight side of the primary screen and a portion of the mid-frame. The display driver is disposed within the accommodating space and is electrically connected to the primary screen. The display driver is used to control the primary screen and the inner screens.

[0008] This application provides a foldable display screen. By placing at least one display driver in the main folding screen and utilizing the space between the backlight side of the main screen and part of the mid-frame, the main screen, display driver, and mid-frame are aligned in a direction perpendicular to the main screen when the foldable display screen is unfolded. Board-to-board connectors can also be placed in the main folding screen simultaneously, effectively reducing the trace length of the foldable display screen without significantly increasing its thickness, reducing insertion loss, and improving eye diagram quality. Compared with related technologies, this reduces the need for at least one through-axis trace, greatly reducing the trace length of the foldable display screen and the width of the through-axis, thereby improving the reliability of the folding edge area, making reasonable use of overall system resources, and significantly improving the performance of the foldable display screen.

[0009] In one possible implementation of the first aspect, one end of the second side of the main screen is connected to one end of the folding edge via the first side of the main screen, and the other end of the second side of the main screen is connected to the other end of the folding edge via the third side of the main screen; along the first direction, the distance between the display driver and the second side of the main screen is less than the distance between the display driver and the folding edge, and the first direction is the direction parallel to the main screen when the foldable display is unfolded.

[0010] In this implementation, by placing the display driver at the edge of the first main screen away from the first inner screen, the wiring in the dual-fold display can be better routed. At the same time, the wiring design of signal lines such as gate lines and data lines can be better, and they can be electrically connected to the display driver through a shorter path, thereby improving the performance of the dual-fold display.

[0011] In one possible implementation of the first aspect, there is a gap between the display driver and the mid-frame.

[0012] In this implementation, if the display driver expands due to heat deformation, the gap can still ensure that the display driver can still be properly placed within the accommodating space.

[0013] In one possible implementation of the first aspect, the main folding screen further includes a first structure disposed on the side of the mid-frame away from the main screen, the orthographic projection of the first structure on the main screen coincides with the orthographic projection of the display driver on the main screen; the first structure includes a main circuit board or a battery.

[0014] In this implementation, the stacking space of the main folding screen can be fully utilized. That is, by coordinating the middle frame, battery or main circuit board and main screen in the vertical direction and staggering their heights, the bottleneck wiring can be completed using narrow strips, minimizing the impact on the vertical space of the whole device. It can also reduce the length of the wiring and the impedance change points of multiple transitions, thus reducing the impact on the eye diagram quality.

[0015] In one possible implementation of the first aspect, the main screen is a first main screen, the secondary folding screen has a first secondary screen, the first secondary screen includes a first inner screen and a first outer screen, the first inner screen and the first outer screen face away from each other, the folding edge is a first folding edge, the first main screen and the first inner screen are respectively located on both sides of the first folding edge and share the first folding edge, in the folded state of the foldable display, the first main screen and the first inner screen face each other, in the unfolded state of the foldable display, the first main screen and the first inner screen are on the same plane; the display driver is a first display driver, the first display driver is used to control the first main screen, the first inner screen and the first outer screen.

[0016] In this implementation, the stacking space of the double-folded display can be fully utilized. That is, by reasonably coordinating and staggering the height of the middle frame, battery or main circuit board and main screen in the vertical direction, the bottleneck wiring can be completed with narrow strips, minimizing the impact on the vertical space of the whole machine. It can also reduce the length of the wiring and the impedance change points of multiple transitions, reduce the impact on the eye diagram quality, thereby realizing the control of the first main screen, the first inner screen and the first outer screen by the first display driver.

[0017] In one possible implementation of the first aspect, along the second direction, the distance between the first display driver and the first side of the first main screen and the distance between the first display driver and the third side of the first main screen are equal; wherein, the second direction is the direction that is parallel to the main screen and perpendicular to the first direction when the foldable display is unfolded.

[0018] In this implementation, by setting the first display driver at a distance equal to the first side and the third side of the first main screen, the wiring in the double-folding display screen can be better routed. At the same time, the distance between the signal lines such as grid lines and data lines and the first display driver is as equal as possible. Thus, the first display driver can be used to achieve better control over the first main screen, the first inner screen and the first outer screen.

[0019] In one possible implementation of the first aspect, the main folding screen further includes a first main circuit board and a first battery. The first main circuit board includes a first sub-main circuit board and a second sub-main circuit board, which are electrically connected. A first side of the first battery is located on the same side as a first side of the first main screen, a second side of the first battery is located on the same side as a second side of the first main screen, a third side of the first battery is located on the same side as a third side of the first main screen, and a fourth side of the first battery is located on the same side as a first folding edge. Along a second direction and a third direction, the first battery is disposed between the first sub-main circuit board and the second sub-main circuit board, and is spaced apart from both the first and second sub-main circuit boards. The third direction is perpendicular to both the first and second directions. The orthographic projection of the first display driver on the first main screen coincides with the orthographic projection of the first battery on the first main screen.

[0020] In this implementation, the first display driver can be smaller and the first battery can be larger. Even if the first battery deforms and expands due to heat, it can still be well placed in the storage space, resulting in better overall performance of the double-folding display screen.

[0021] In one possible implementation of the first aspect, the first sub-screen further includes a second main circuit board, a second battery, and a first outer screen main circuit board. The second main circuit board includes a third sub-main circuit board and a fourth sub-main circuit board, which are electrically connected. The first side of the second battery is on the same side as the first side of the first inner screen, the second side of the second battery is on the same side as the second side of the first inner screen, the third side of the second battery is on the same side as the third side of the first inner screen, and the fourth side of the second battery is on the same side as the first folding edge. Along the second direction and the third direction, the second battery is disposed between the third sub-main circuit board and the fourth sub-main circuit board, and is spaced apart from both the third and fourth sub-main circuit boards. The first outer screen main circuit board is electrically connected to the third sub-main circuit board and the fourth main circuit board, respectively. Along the direction perpendicular to the main screen, the first outer screen main circuit board overlaps with the second battery. The foldable display screen further includes a first through-axis, which is electrically connected to the first sub-main circuit board and the third main circuit board, respectively. Along the third direction, the first through-axis overlaps with the first folding edge.

[0022] In this implementation, by placing the first display driver in the main folding screen, the stacking space of the main folding screen is fully utilized. That is, through the reasonable vertical coordination and staggered layout of the first mid-frame, the first battery, and the first main circuit board, shorter components or no components are placed in the upper and lower spaces of the first main circuit board in the first display driver area. Narrow strips can be used to complete bottleneck wiring, minimizing the impact on the vertical space of the whole machine. At the same time, the board-to-board connectors are also placed in the main folding screen, which can minimize the waste of resources when screen traces pass from the first sub-screen to the main folding screen, reduce trace length and impedance change points of multiple transitions, reduce the impact of eye diagram quality, reduce the number of through-axis board-to-board connectors, and save layout area.

[0023] In one possible implementation of the first aspect, the main screen is a second main screen, the sub-folding screen includes a second sub-screen and a third sub-screen, the second sub-screen has at least a second inner screen, the third sub-screen has a third inner screen, the folding edge includes a second folding edge and a third folding edge, the second main screen and the second inner screen are respectively located on both sides of the second folding edge and share the second folding edge, the second inner screen and the third inner screen are respectively located on both sides of the third folding edge and share the third folding edge, in the folded state of the foldable display, the second main screen and the second inner screen face each other, in the unfolded state of the foldable display, the second main screen, the second inner screen and the third inner screen are on the same plane; the display driver includes a second display driver and a third display driver, the second display driver and the third display driver are spaced apart and separately arranged, the second display driver and the third display driver are both disposed in the accommodating space and are both electrically connected to the second main screen, the second display driver and the third display driver are jointly used to control the second main screen, the second inner screen and the third inner screen.

[0024] In this implementation, by using two display drivers, the resolution of the tri-fold display can be maintained while increasing the screen size. Specifically, the second and third display drivers are placed within the accommodating space of the second mid-frame and the second main screen, and the board-to-board connectors associated with the two display drivers are simultaneously placed in the main folding screen. This way, when electrically connecting the two display drivers to the system-on-a-chip (SoC), the traces between the two display drivers and the SoC do not need to pass through the through-hinge area of ​​the tri-fold display, significantly shortening the trace length, reducing insertion loss, and improving the signal quality of the tri-fold display. Simultaneously, the width of the through-hinge area can be reduced, improving its reliability and significantly enhancing its performance by utilizing overall system resources. Therefore, when this tri-fold display is applied to electronic devices, it can significantly improve the overall performance of the electronic devices.

[0025] In one possible implementation of the first aspect, the main folding screen further includes a third main circuit board and a third battery. The third main circuit board includes a fifth sub-main circuit board and a sixth sub-main circuit board, which are electrically connected. The first side of the third battery is located on the same side as the first side of the second main screen, the second side of the third battery is located on the same side as the second side of the second main screen, the third side of the third battery is located on the same side as the third side of the second main screen, and the fourth side of the third battery is located on the same side as the second folding edge. The third battery is disposed between the fifth sub-main circuit board and the sixth sub-main circuit board along a second direction and a third direction, and is spaced apart from both the fifth and sixth sub-main circuit boards. The second direction is parallel to the main screen and perpendicular to the first direction, and the third direction is perpendicular to both the first and second directions. The orthographic projection of the second display driver on the second main screen coincides with the orthographic projection of the fifth sub-main circuit board on the second main screen.

[0026] In this implementation, the two display drivers can be made smaller. Since the two display drivers do not occupy the space of the third battery, the third battery can be larger, with a higher capacity and better battery life, thus resulting in better overall performance of the tri-fold display screen.

[0027] In one possible implementation of the first aspect, the second sub-screen has a second inner screen and a second outer screen, with the second inner screen facing away from the second outer screen. In the folded state of the foldable display, the second main screen and the third inner screen face each other, with the third inner screen located between the second main screen and the second inner screen. In the unfolded state of the foldable display, the second main screen, the second inner screen, and the third inner screen are on the same plane. The second display driver and the third display driver are used together to control the second main screen, the second inner screen, the second outer screen, and the third inner screen. The fifth sub-main circuit board also extends to a position between the second side of the third battery and the second side of the second main screen. The orthographic projection of the third display driver on the second main screen coincides with the orthographic projection of the portion of the fifth sub-main circuit board located between the second side of the third battery and the second side of the second main screen on the second main screen.

[0028] In this implementation, by extending the fifth sub-main circuit board to the area between the second side of the third battery and the second side of the second main screen, the second outer screen main circuit board can be connected to this part of the fifth sub-main circuit board, thereby achieving better control over the second outer folding screen. At the same time, the third display driver does not occupy the space of the third battery, the third battery can be larger in size, have a higher battery capacity, and better battery life, thus resulting in better overall performance of the three-fold display screen.

[0029] In one possible implementation of the first aspect, the second sub-screen includes a fourth main circuit board and a fourth battery. The fourth main circuit board includes a seventh sub-main circuit board and an eighth sub-main circuit board, which are electrically connected. The first side of the fourth battery is on the same side as the first side of the second inner screen, the second side of the fourth battery is on the same side as the second folded edge, the third side of the fourth battery is on the same side as the second inner screen, and the fourth side of the fourth battery is on the same side as the third folded edge. Along a third direction, the fourth battery is disposed between the seventh and eighth sub-main circuit boards and spaced apart from both of them. The third sub-screen includes a fifth main circuit board and a fifth battery. The fifth main circuit board includes a ninth and a tenth sub-main circuit board, which are electrically connected. The first side of the fifth battery is on the same side as the first side of the third inner screen, the second side of the fifth battery is on the same side as the second side of the third inner screen, the third side of the fifth battery is on the same side as the third inner screen, and the fourth side of the fifth battery is on the same side as the third folded edge. Along a third direction, the fifth battery is disposed between the ninth and tenth sub-main circuit boards and spaced apart from both the ninth and tenth sub-main circuit boards; the foldable display screen also includes a second through-shaft, a third through-shaft, a second main screen circuit board, a third inner screen circuit board, and a second outer screen main circuit board. The second outer screen main circuit board is electrically connected to the portion of the fifth sub-main circuit board extending between the second side of the third battery and the second side of the second main screen, and to the eighth sub-main circuit board. Along a third direction, the second outer screen main circuit board overlaps with the third battery and the second folding edge. The second through-shaft is electrically connected to the fifth and seventh sub-main circuit boards, and along a third direction, the second through-shaft overlaps with the second folding edge. The third through-shaft is electrically connected to the seventh and ninth sub-main circuit boards, and along a third direction, the third through-shaft overlaps with the third folding edge. The second main screen circuit board is electrically connected to the portion of the fifth sub-main circuit board extending between the second side of the third battery and the second side of the second main screen, and to the sixth sub-main circuit board. The third inner screen circuit board is electrically connected to the ninth and tenth sub-main circuit boards.

[0030] In this implementation, by placing the two display drivers in the main folding screen, the stacking space of the main folding screen is fully utilized. Bottleneck wiring can be completed using narrow strips, minimizing the impact on the vertical space of the entire device. At the same time, the board-to-board connectors are also placed in the main folding screen, which can minimize the waste of resources when screen traces pass from the first sub-screen to the main folding screen, reduce trace length and impedance change points from multiple transitions, reduce the impact on eye diagram quality, and reduce the number of through-axis board-to-board connectors, thus saving layout area. In addition, while the overall device continues to be thinner, the third display driver is laid out on the side of the third battery by using the second mid-frame disassembly method, maintaining the thickness and capacity of the third battery. This method adds a second outer screen main circuit board, but there is no transition from the sub-folding screen to the second and third through-axis, reducing the width of the through-axis and the narrow strip wiring resources of the fourth and fifth main circuit boards in the sub-folding screen.

[0031] In one possible implementation of the first aspect, the mid-frame includes a mid-frame body and a mid-frame component, the mid-frame body and the mid-frame component are connected, the thickness of the mid-frame component is less than the thickness of the mid-frame body, and the mid-frame component is disposed on the side of the third display driver away from the fifth sub-main circuit board along a first direction and located between the second main screen and the third battery along a third direction.

[0032] In this implementation, the mid-frame components are relatively thin while ensuring good support for the entire mid-frame.

[0033] In one possible implementation of the first aspect, the middle frame component has at least a first side and a second side, the first side is connected to the second side and the length of the first side is greater than the length of the second side, the tensile strength of the middle frame component along the first side is 600 MPa-650 MPa, the tensile strength of the middle frame component along the second side is 650 MPa-750 MPa, the elastic modulus of the middle frame component along the first side is 100 GPa-110 GPa, and the elastic modulus of the middle frame component along the second side is 60 GPa-70 GPa.

[0034] In this implementation, the mid-frame components are relatively thin while still ensuring good support.

[0035] In one possible implementation of the first aspect, the main body of the middle frame is any one of an aluminum alloy middle frame, a magnesium alloy middle frame, and a titanium alloy middle frame; the middle frame components are any one of steel plate, carbon plate, and aluminum alloy.

[0036] This implementation method is simple and easy to implement.

[0037] In one possible implementation of the first aspect, the second sub-screen has a second inner screen. In the folded state of the foldable display, the second main screen faces the second inner screen, and the third inner screen faces away from the second inner screen. In the unfolded state of the foldable display, the second main screen, the second inner screen, and the third inner screen are on the same plane. The second display driver and the third display driver are used together to control the second main screen, the second inner screen, and the third inner screen. The orthographic projection of the third display driver on the second main screen coincides with the orthographic projection of the third battery on the second main screen.

[0038] In this implementation, by rationally arranging the position of the third display driver, the triple-folding screen display can minimize the waste of resources caused by screen traces running from the first sub-screen to the main folding screen. It can also reduce trace length and impedance abrupt change points from multiple transitions, reduce the impact on eye diagram quality, reduce the number of through-axis board-to-board connectors, and save layout area.

[0039] In one possible implementation of the first aspect, the second sub-screen includes a fourth main circuit board and a fourth battery. The fourth main circuit board includes a seventh sub-main circuit board and an eighth sub-main circuit board, which are electrically connected. The first side of the fourth battery is located on the same side as the first side of the second inner screen, the second side of the fourth battery is located on the same side as the second folded edge, the third side of the fourth battery is located on the same side as the second inner screen, and the fourth side of the fourth battery is located on the same side as the third folded edge. Along a third direction, the fourth battery is disposed between the seventh and eighth sub-main circuit boards and spaced apart from both the seventh and eighth sub-main circuit boards. The third sub-screen includes a fifth main circuit board and a fifth battery. The fifth main circuit board includes a ninth and a tenth sub-main circuit board, which are electrically connected. The first side of the fifth battery is located on the same side as the first side of the third inner screen, and the second side of the fifth battery is located on the same side as the second side of the third inner screen. The third side of the fifth battery is on the same side as the third side of the third inner screen, and the fourth side of the fifth battery is on the same side as the third folding edge. Along the third direction, the fifth battery is disposed between the ninth sub-main circuit board and the tenth sub-main circuit board, and is spaced apart from both the ninth and tenth sub-main circuit boards. The foldable display screen also includes a second through-axis, a third through-axis, a third main screen circuit board, a third inner screen circuit board, and a fourth inner screen circuit board. The second through-axis is electrically connected to the fifth sub-main circuit board and the seventh sub-main circuit board, and along the third direction, the second through-axis overlaps with the second folding edge. The third through-axis is electrically connected to the seventh sub-main circuit board and the ninth sub-main circuit board, and along the third direction, the third through-axis overlaps with the third folding edge. The third main screen circuit board is electrically connected to the fifth sub-main circuit board and the sixth sub-main circuit board. The third inner screen circuit board is electrically connected to the ninth sub-main circuit board and the tenth main circuit board. The fourth inner screen circuit board is electrically connected to the seventh sub-main circuit board and the eighth sub-main circuit board.

[0040] In this implementation, by placing both display drivers within the main folding screen, the stacking space of the main folding screen is fully utilized. This is achieved through the reasonable vertical coordination and staggered layout of the second mid-frame, the third battery, and the third main circuit board. Shorter components or no components are placed in the upper and lower spaces of the third main circuit board in the display driver area. Narrow strips can be used to complete bottleneck wiring, minimizing the impact on the overall vertical space of the device. At the same time, the board-to-board connectors are also placed within the main folding screen, which can minimize the waste of resources when screen traces pass from the first sub-screen to the main folding screen. It can also reduce trace length and impedance abruptness points from multiple transitions, reduce the impact on eye diagram quality, reduce the number of through-axis board-to-board connectors, and save layout area.

[0041] In a second aspect, a display module is provided, including a foldable display screen as described in the first aspect or any possible implementation thereof.

[0042] This application provides a display module with low insertion loss, good eye diagram quality, and excellent performance.

[0043] Thirdly, an electronic device is provided, including a display module as described in the second aspect or any possible implementation thereof.

[0044] This application provides an electronic device with low insertion loss, good eye diagram quality, and excellent performance.

[0045] This application provides a foldable display screen, a display module, and an electronic device. By placing at least one display driver in the main folding screen and utilizing the space between the backlight side of the main screen and part of the mid-frame, the main screen, display driver, and mid-frame are coordinated in a direction perpendicular to the main screen when the foldable display screen is unfolded. Board-to-board connectors can also be placed in the main folding screen simultaneously, effectively reducing the trace length of the foldable display screen without significantly increasing its thickness, reducing insertion loss, and improving eye diagram quality. Compared with related technologies, this reduces the need for at least one through-axis trace, greatly reducing the trace length of the foldable display screen and the width of the through-axis, thereby improving the reliability of the folding edge area, making rational use of overall system resources, and significantly improving the performance of the foldable display screen. Attached Figure Description

[0046] Figure 1 A schematic diagram of a dual-folding screen mobile phone provided in an embodiment of this application;

[0047] Figure 2 A schematic diagram of a control component in a dual-folding screen mobile phone provided in an embodiment of this application;

[0048] Figure 3 A schematic diagram of the hardware connection logic of an AP, a power manager, and a display screen provided for an embodiment of this application;

[0049] Figure 4 This is a schematic diagram of the structure of a candybar mobile phone provided in an embodiment of this application;

[0050] Figure 5 A schematic diagram of the DDIC setup structure for a dual-folding screen mobile phone, provided for related technologies;

[0051] Figure 6 A schematic diagram of another DDIC setup structure for a dual-folding screen phone provided for related technologies;

[0052] Figure 7 A top view of a double-folding display screen in its unfolded state, provided as an embodiment of this application;

[0053] Figure 8 The first main screen of a dual-folding display provided in this application embodiment has a cross-sectional view of DDIC A after being cut along cutting lines F1F2;

[0054] Figure 9 This application provides a schematic diagram of the structure of a G-shaped triple-fold display screen according to an embodiment of the present application.

[0055] Figure 10 A top view of a G-shaped triple-fold display screen in its unfolded state, provided as an embodiment of this application;

[0056] Figure 11 A cross-sectional view of a G-shaped triple-folding display screen provided in this application embodiment, having DDIC B cut along cutting lines F1F2;

[0057] Figure 12 A cross-sectional view of a G-shaped triple-folding display screen provided in this application embodiment, obtained by cutting along cutting line F1F2 with DDIC C;

[0058] Figure 13 This application provides a schematic diagram of the structure of an N-shaped triple-fold display screen according to an embodiment of the present application.

[0059] Figure 14 A top view of an N-shaped tri-fold display screen in its unfolded state, provided as an embodiment of this application;

[0060] Figure 15 A cross-sectional view of an N-shaped triple-fold display screen provided in this application, obtained by cutting along cutting line F1F2 with DDIC B;

[0061] Figure 16 A cross-sectional view of an N-shaped triple-fold display screen provided in this application, obtained by cutting along cutting line F1F2 with DDIC C;

[0062] Figure 17 A schematic diagram of insertion loss simulation curves for a DDIC placed in different displays is provided for embodiments of this application.

[0063] Figure 18 A schematic diagram of an eye diagram simulation result of a DDIC placed on the main screen, provided as an embodiment of this application;

[0064] Figure 19 A schematic diagram of eye diagram simulation results for a DDIC placed on the secondary screen of a dual-folding display, providing insights into related technologies;

[0065] Figure 20 This is a schematic diagram of the eye diagram simulation results for a DDIC placed on the secondary screen furthest from the main screen in a tri-fold display, providing information for related technologies. Detailed Implementation

[0066] The technical solutions in the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; the word "and / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0067] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more, and "at least one" means one or more.

[0068] The application scenarios involved in the embodiments of this application will be introduced below.

[0069] This application does not limit the specific type of electronic device. In some embodiments, the electronic device may include mobile phone, tablet, notebook, wearable device (e.g., smart bracelet, smartwatch, and headphones), laptop, handheld computer, ultra-mobile personal computer (UMPC), cellular phone, personal digital assistant (PDA), augmented reality (AR) / virtual reality (VR) device and other Internet of Things (IoT) devices, in-vehicle electronic device, and may also be a television, large screen, printer, projector, etc.

[0070] With the development of technology, most electronic devices now have displays, and these displays are becoming increasingly powerful. As display functions increase, the required screen size also increases, allowing for more information and operations to be provided to users, thus making electronic devices more powerful. However, the increased screen size significantly impacts the portability of electronic devices. For example, users typically want to hold their phones in one hand, but if the screen is too large, it may be impossible to hold them with one hand. Therefore, after many years of unremitting efforts, foldable screen electronic devices, such as foldable phones, have emerged on the market to enable electronic devices with larger displays while remaining easy to carry. Thus, by equipping electronic devices with displays composed of multiple screens, they can achieve more powerful functions, while simultaneously reducing their size when folded, making them easier for users to carry.

[0071] The following explanation uses foldable screen phones as an example of foldable screen electronic devices. Of course, foldable screen electronic devices are not limited to foldable screen phones.

[0072] In practical applications, the display screen of a foldable phone can be used to display images and videos. This display screen can include multiple screens, which can be flexible or rigid. For example, the screens can be any of the following: liquid crystal display (LCD), organic light-emitting diode (OLED), mini light-emitting diode (Mini LED), and micro light-emitting diode (Micro LED).

[0073] As an example, a foldable phone can have a foldable screen on its inner side and one or more other non-foldable screens (also known as hard screens) on its outer side. When the foldable phone is unfolded, the foldable screen faces the user and provides display information and operations. When the foldable phone is folded, the outer hard screen faces the user and provides display information and operations. The foldable screen can be folded to form at least two screens. Specifically, the foldable screen can be folded along the folding edge (also known as the folding axis) to form at least two screens. At least two screens can be folded completely outwards, or completely inwards, or partially outwards and partially inwards, depending on the actual application. For example, when the foldable screen is folded to form two screens, the two screens can be folded inwards facing each other, or the two screens can be folded outwards facing away from each other.

[0074] It should be noted that a hard screen may not be placed on the outside of the foldable phone. Instead, at least one of the foldable screens can be folded outwards and used as the external screen facing the user.

[0075] Figure 1 A schematic diagram of a dual-folding screen phone is provided. It should be noted that a dual-folding screen phone refers to a phone that can be folded once.

[0076] like Figure 1 As shown, the dual-folding screen phone 01 may include: a first dual-folding screen 1, a second dual-folding screen 2, and a rigid screen 3. The first dual-folding screen 1 and the second dual-folding screen 2 are located on opposite sides of the dual-folding edge 4 and share the same edge 4. Therefore, when the dual-folding screen phone 01 is in the folded state, the first dual-folding screen 1 and the second dual-folding screen 2 are interlocked, i.e., facing each other. When the dual-folding screen phone 01 is in the unfolded state, the first dual-folding screen 1 and the second dual-folding screen 2 are on the same plane. It should be noted that in different implementations, the first dual-folding screen 1 and the second dual-folding screen 2 can be a logical division, actually implemented through a single foldable screen; or, the first dual-folding screen 1 and the second dual-folding screen 2 can be two independent non-folding screens.

[0077] The dual-folding screen phone 01 can have three display states, for example, Figure 1 The unfolded state shown in Figure (a) is as follows: Figure 1 The folding state shown in (c) and Figure 1 Figure (b) shows the semi-folded state between the two. The folding angle of the dual-folding screen phone 01 in its unfolded state is 180°, corresponding to the angle between the first dual-folding screen 1 and the second dual-folding screen 2 being 180°. In the folded state, the first dual-folding screen 1 and the second dual-folding screen 2 face each other, with the rigid screen 3 located on the outside of the dual-folding screen phone 01; at this time, the folding angle is 0°. Therefore, when the folding angle is between 0° and 180°, the dual-folding screen phone 01 is in a semi-folded state.

[0078] Understandable, Figure 1 The image only shows the state of the dual-folding screen phone 01 with a folding angle between 0° and 180°. However, in some other implementations, the dual-folding screen phone 01 can also support folding angles greater than 180°. In this case, the first dual-folding screen 1 and the second dual-folding screen 2 can serve as the exterior surfaces of the dual-folding screen phone 01 to provide display information and operation to the user. The specific implementation depends on the actual application.

[0079] It should be noted that, Figure 1The front camera and audio component 5 located on the hard screen 3 are also shown. Only the contents related to the inventive point are described here, and the front camera and audio component 5 are not described in detail here.

[0080] In order to properly control each screen of the dual-folding screen phone 01, corresponding control components are set up in the dual-folding screen phone 01.

[0081] Figure 2 The diagram shows some of the control components in a dual-folding screen phone. Of course, the control components of a dual-folding screen phone may not be limited to... Figure 2 The specific components provided may vary depending on the actual application.

[0082] like Figure 2 As shown, a dual-folding screen phone can be equipped with a display driver component (including at least a first dual-folding screen, a second dual-folding screen, and a hard screen), an application processor (AP), and a power management component, etc., to achieve different controls on different structures.

[0083] In practical applications, the display driving component may also include at least one display driver (display driver integrated circuit, DDIC), which is an integrated circuit chip that drives the display screen and can be used to send drive signals and data to the display screen in the form of electrical signals to achieve control of the display screen.

[0084] The AP can be used for overall management and control of each display screen. For example, the AP can control the power-on of the first double-folding screen, the second double-folding screen, and the hard screen through the power management component, or the AP can control the first double-folding screen, the second double-folding screen, and the hard screen to display images through the DDIC.

[0085] The aforementioned power management component may include at least one power manager, which can be used to control the power supply to the first dual-fold screen, the second dual-fold screen, the rigid screen, and the DDIC, respectively. Alternatively, one or more power managers can be implemented using a single power management integrated circuit (PMIC), meaning the power management component may include one or more PMICs to control the power supply to the first dual-fold screen, the second dual-fold screen, and / or the rigid screen under the instruction of the AP.

[0086] Figure 3 A schematic diagram of the hardware connection logic of the AP, power manager and display is provided.

[0087] like Figure 3As shown, the AP is electrically connected to the power manager and is used to send power management information, such as power-on instructions, to the power manager. The power manager can be electrically connected to the hard screen via a first power supply link, so that the power manager can supply power to the hard screen through the first power supply link according to the received power management information. Similarly, the power manager can also be electrically connected to the first and second dual-fold screens via a second power supply link, so that the power manager can supply power to the first and second dual-fold screens through the second power supply link according to the received power management information. The power manager can also be electrically connected to the DDIC via a third power supply link, so that the power manager can supply power to the DDIC through the third power supply link according to the received power management information.

[0088] Furthermore, the AP can also be electrically connected to the DDIC via a first control link to send control information to the DDIC. This control information may include image information to be displayed, reading values ​​from relevant registers, issuing other instructions, etc. In some embodiments, the first control link can be implemented through one or more communication lines corresponding to the Mobile Industry Processor Interface (MIPI).

[0089] It should be noted that, in addition to the display driver components, AP and power management components mentioned above, dual-folding screen phones may also include other structures such as a mid-frame, circuit board assembly, rear camera assembly, microphone and speaker.

[0090] In practical applications, the mid-frame can be any shape as needed, and the material of the mid-frame can be any of aluminum alloy, magnesium alloy, and titanium alloy.

[0091] Circuit board assemblies can include main circuit boards and electronic components, and their types can include printed circuit board assemblies (PCBAs).

[0092] The main circuit board is used to carry electronic components and interact with them via signals. It can be a rigid circuit board, such as a printed circuit board (PCB), or a flexible printed circuit board (FPC), or even a hybrid rigid-flex circuit board. The main circuit board can be single-sided (with electronic components on one side) or double-sided (with electronic components on both sides). It can also carry system-on-chips (SoCs), which are typically located on the first folded screen of a dual-folding phone, depending on the specific application.

[0093] Among them, electronic components may include, but are not limited to, batteries, resistors, capacitors, inductors, potentiometers, electron tubes, heat sinks, connectors, sensors, switches, micro motors, electronic transformers, relays, customer identification module slots, processors, antenna modules, Bluetooth modules, wireless fidelity (WiFi) modules, and global positioning system (GPS) modules.

[0094] To illustrate the DDIC setup, the following sections will describe single-screen smartphones, dual-folding phones (as mentioned above), and triple-folding phones. It should be noted that a triple-folding phone refers to a phone that can be folded twice.

[0095] Figure 4 A schematic diagram of a candybar mobile phone structure is provided.

[0096] like Figure 4 As shown, the candybar phone 02 may include a candybar screen 6, a first chip-on-film (COF) 7, a candybar circuit board 8, a DDIC, and an AP. One end of the first COF 7 is bonded to the candybar screen 6, and the other end is electrically connected to the candybar circuit board 8. A DDIC is disposed on the first COF 7. The AP can be electrically connected to the candybar circuit board 8 through a second control link to send control information to the candybar circuit board 8. It should be noted that the DDIC in the candybar phone 02 has the same function as the DDIC in the dual-folding screen phone, but the size and model may be the same or different. The same applies to the AP; the specific details depend on the actual application.

[0097] Because the candybar phone 02 only has a single candybar screen 6, compared to phones with foldable screens such as dual-folding and triple-folding phones, the size of the candybar screen 6 is limited. Therefore, when the grid lines of the candybar screen 6 ( Figure 4 (not shown in the image), data cable ( Figure 4 When signal lines (not shown) are fan-out bound to this DDIC, the DDIC is often bound to the non-display area BB of the candybar screen, thus freeing up more display area for the candybar screen 6. It should be noted that the area in the candybar screen 6 that can be displayed is the display area AA of the candybar screen, and the area outside the display area AA that is not used for display is the non-display area BB of the candybar screen.

[0098] Figure 5 and Figure 6 They were given respectively Figure 1 The diagram shows the DDIC configuration structure of the dual-folding screen phone 01.

[0099] Because dual-folding screen phones have a first dual-folding screen, a second dual-folding screen, and a rigid screen, and each screen can be made the same size as a regular screen, when the dual-folding screen phone is folded, the user sees the same size rigid screen as the regular screen, making it easy to carry. When the dual-folding screen phone is unfolded, the user sees a screen that combines the first and second dual-folding screens, resulting in a larger screen size. For example, the regular screen size can be 6.78 inches, and the combined size of the first and second dual-folding screens can be 7.92 inches.

[0100] As phones with foldable screens become larger, it's necessary to place multiple DDICs and / or increase the size of a single DDIC to achieve better control over each screen within the larger screen. For example, the size (length × width × thickness) of a single DDIC can be increased from 32.92mm × 1.61mm × 0.2mm to 32.92mm × 2.16mm × 0.2mm; other sizes are also possible, and no specific limitations are made here.

[0101] Since a dual-folding phone, when unfolded, has a combined screen size that is only one screen larger than a standard screen, the first and second dual-folding screens can be combined in a dual-folding phone, similar to the DDIC setup in standard phones. This allows for the control of the first, second, and hard screens via a single DDIC. Because the first and second dual-folding screens fold along the double-folding edges, a larger DDIC could be used in a dual-folding phone. Figure 4 With that placement, the DDIC would be located in the folding area where the double-folding edges are located. Therefore, when the first and second double-folding screens are folded, the DDIC will also be folded, which may cause the DDIC to break under stress during the bending process. Therefore, the DDIC position in the straight screen cannot be referred to, and the setting position of the DDIC needs to be changed.

[0102] Please refer to this again. Figure 1 Because dual-folding screen phones have more screens and a larger display area, the DDIC can be placed in the display area or non-display area of ​​any screen without affecting the display effect of the dual-folding screen phone.

[0103] Figure 5 A schematic diagram of a DDIC configuration in a dual-folding screen phone is provided.

[0104] like Figure 5As shown, the first dual-fold screen 1 of the dual-folding screen phone can be equipped with a first battery 10, a first PCB 11, a first SOC 13, a first rear camera 121, and a second rear camera 122. Meanwhile, the second dual-folding screen 2 of the dual-folding screen phone can be equipped with a second battery 20, a second PCB 21, a front camera and audio component 5, a first board-to-board (BTB) connector 231, a second BTB 232, and a DDIC.

[0105] Specifically, along a direction perpendicular to the second double-folding screen 2, the DDIC can be positioned within the accommodating space between the second battery 20 and the second double-folding screen 2. It should be noted that only the location of the DDIC is described here; other structures and their positional relationships are not detailed. Figure 5 Only some structures that may be related to the location of DDIC are shown. The first double-folding screen 1 and the second double-folding screen 2 can certainly have other structures. Figure 5 Not shown.

[0106] Please refer to this again. Figure 5 The dual-folding screen phone 01 may also include a first through-axis FPC 24, which is electrically connected to the first PCB 11 and the second PCB 21 respectively.

[0107] Figure 5 The proposed solution has several problems: 1. The DDIC has a certain volume, and placing it in the second double-folding screen 2 requires a certain amount of space, resulting in a space loss in the second double-folding screen 2 due to the space allocated for the DDIC. For example, approximately 0.2mm of space is lost along the direction perpendicular to the second double-folding screen 2. 2. Because the DDIC is placed below the second battery 20, it occupies part of the space originally intended for the second battery 20 in the direction perpendicular to the second double-folding screen 2. This necessitates reducing the volume of the second battery 20, thus decreasing its battery capacity and consequently reducing the battery capacity of the double-folding screen phone 01. 3. The first through-axis FPC 24 spans the first double-folding screen 1 and the second double-folding screen 2, causing some display traces (such as...) to be obstructed. Figure 5The dotted line portion shown needs to pass through the second PCB 21 and the first through-axis FPC 24 sequentially before reaching the first PCB 11, making the trace longer and the trace path longer, increasing wiring resources and affecting the signal quality of the trace. 4. The DDIC trace increases the width of the first through-axis FPC 24, affecting the space utilization of the first through-axis FPC 24 area and causing waste of overall machine resources. It should be noted that the direction perpendicular to the first double-folding screen 1 is the same as the direction perpendicular to the second double-folding screen 2, which is the direction perpendicular to the first double-folding screen 1 and the second double-folding screen 2 when they are unfolded.

[0108] However, based on current computerized numerical control (CNC) technology, for Figure 5 For the dual-folding screen phone 01, it's impossible to continuously thin the mid-frame. Given user demands for a continuously thinner overall design, and to both protect the thickness of the second battery 20 along the direction perpendicular to the second dual-folding screen 2 while maintaining the mid-frame's support function, the relevant technology opts to disassemble the mid-frame into multiple connected parts. The main component retains the same material as the original mid-frame and bears most of the support. The disassembled parts can be made thinner, and the main component and disassembled parts are connected together to form the mid-frame. It should be noted that the thickness and position of the main component and disassembled parts can be selected based on the positions of other structures to achieve a more reasonable layout.

[0109] Figure 6 A schematic diagram of another DDIC configuration in a dual-folding screen phone is provided. It should be noted that... Figure 6 The first dual-folding screen of the Zhongdui Dual-Folding Phone 01 and Figure 5 The first dual-folding screen 1 of the dual-folding screen phone 01 is the same, so it will not be described again here.

[0110] like Figure 6 As shown, the second folding screen 2 of the dual-folding screen phone can be equipped with a second battery 20, a second PCB 21, a front camera 51, an audio 52, a first BTB 231, a second BTB 232, a first steel piece 25, and a DDIC.

[0111] Specifically, along a direction perpendicular to the second double-folding screen 2, the first steel member 25 is positioned between the second battery 20 and the second double-folding screen 2, and the first steel member 25 is positioned with respect to the middle frame of the second double-folding screen. Figure 6(Not shown in the diagram) The connection can be used as a mid-frame component; and, along a direction perpendicular to the second double-folding screen 2, the DDIC can be disposed within the accommodating space between the second PCB 21 and the second double-folding screen 2, this accommodating space can be located on the side of the second battery 20 away from the first double-folding screen 1. It should be noted that only the location of the DDIC is described here; other structures and their positional relationships are not described in detail, and... Figure 6 Only some structures that may be related to the location of DDIC are shown. The first double-folding screen 1 and the second double-folding screen 2 can certainly have other structures. Figure 6 Not shown.

[0112] Please refer to this again. Figure 6 The dual-folding screen phone 01 may also include a first through-axis FPC 24, which is electrically connected to the first PCB 11 and the second PCB 21 respectively.

[0113] Therefore, by placing the DDIC on the side of the second battery 20 away from the first bi-fold screen 1, the DDIC and the second battery 20 do not overlap in the direction perpendicular to the second bi-fold screen 2, instead of placing the DDIC between the second battery 20 and the second bi-fold screen 2. In other words, the DDIC is embedded and protected in the space between the side of the second bi-fold screen 2 away from the first bi-fold screen 1 and the second PCB 21. Since the DDIC does not occupy the space of the second battery 20 in the direction perpendicular to the second bi-fold screen 2, the size of the second battery 20 can be set to be larger, resulting in a larger capacity and longer battery life.

[0114] Figure 6 The proposed solution still has the following problems: 1. The DDIC has a certain volume, and placing it in the second double-fold screen 2 requires a certain amount of space, resulting in a space loss in the second double-fold screen 2 due to the space allocated for the DDIC. For example, approximately 0.2mm of space is lost along the direction perpendicular to the second double-fold screen 2. 2. The first through-axis FPC 24 spans the first double-fold screen 1 and the second double-fold screen 2, causing some traces on the display screen (such as...) to be obstructed. Figure 5 The dotted line portion shown requires the traces to pass through the second PCB 21 and the first through-axis FPC 24 before reaching the first PCB 11, increasing the trace length and path, thus increasing wiring resources and affecting signal quality. 3. The DDIC trace increases the width of the first through-axis FPC 24, affecting the space utilization of that area and resulting in wasted overall system resources.

[0115] Currently, to achieve larger displays while maintaining portability, various foldable phones with multiple screens have emerged on the market, such as tri-fold phones. Taking tri-fold phones as an example, their size compared to... Figure 4 The size of a traditional candybar phone would be significantly larger; for example, a tri-fold phone could be around 10 inches. Given the large size of a tri-fold phone, it would be necessary to accommodate more smaller DDICs and / or multiple larger DDICs. For instance, two DDICs measuring 32.92mm × 1.61mm × 0.2mm or two measuring 32.92mm × 2.16mm × 0.2mm could be placed within the tri-fold phone. Therefore, with the increase in the number and / or size of DDICs, how to rationally achieve the stacking layout of DDICs within the space of the tri-fold phone is key to achieving a thinner overall thickness, smaller size, and better performance.

[0116] Because triple-folding screen phones have more screens, the related technologies generally still follow the DDIC placement design of the aforementioned dual-folding screen phones. Taking two DDICs as an example, the related technologies typically place the two DDICs on the side of the triple-folding screen farthest from the screen containing the SOC, away from the screen containing the SOC. This screen farthest from the screen containing the SOC is not connected to the screen containing the SOC.

[0117] Therefore, tri-fold screen phones in related technologies have many problems: 1. The two 5-group D-PHY high-speed cables related to the screen need to pass through other screens and the hinge in sequence to reach the main screen with the SOC. At this time, the cable length is relatively long. Figure 5 and Figure 6 1. Longer trace lengths are required, for example, the total wiring length can reach approximately 240mm, which is about 100mm longer than that of a dual-folding screen phone. 2. At least one BTB needs to be added between the through-axis FPC and the PCB. The BTB needs to be attached to the main circuit board of the screen with the DDIC, and these BTBs are used for transition. However, multiple transitions of BTBs may increase impedance abruptness points, affecting signal quality. 3. If the DDIC traces also follow the screen trace path, the power-related performance is difficult to achieve due to the excessively long path, and it will also increase the number of traces and layout area. 4. Even if the part of the mid-frame located where the DDIC is located is assembled by disassembling, some areas of the screen with the DDIC are still not fully utilized, resulting in wasted space. 5. Triple-folding screen phones require two through-axis FPCs, so some traces need to cross the through-axis FPC twice, increasing the thickness and width of the through-axis FPC, resulting in weakened strength in the through-axis FPC area.

[0118] In summary, the current placement of the DDIC in various foldable screen phones presents numerous problems, resulting in poor overall performance and a subpar user experience.

[0119] In view of this, this application provides a foldable display screen. This foldable display screen incorporates at least one DDIC (Distributed Direct Input Device) within the main folding screen, fully utilizing the space occupied by the mid-frame, main circuit board, and battery at the main folding screen. While minimizing the increase in the overall thickness of the foldable display screen, the DDIC is embedded under the mid-frame for protection. Simultaneously, the BTB (Browser Module) can be placed within the main folding screen. This reduces trace length when connecting to the SOC (System-on-a-Chip) located within the main folding screen, without significantly increasing the thickness of the foldable display screen perpendicular to the main screen, thus reducing insertion loss and improving eye diagram quality. Compared to related technologies, it reduces the need for at least one through-axis FPC (Flexible Printed Circuit) and traces, decreasing the trace length and width of the through-axis FPC, improving the reliability of the folding edge area, and rationally utilizing overall system resources, thereby enhancing the performance of the foldable display screen. Consequently, electronic devices using this foldable display screen exhibit low insertion loss, high eye diagram quality, and excellent performance.

[0120] Please refer to the following: Figures 7 to 16 This application provides a detailed description of the foldable display screen provided in the embodiments.

[0121] like Figures 7 to 16 As shown in the embodiments of this application, the foldable display screen may include a secondary foldable screen and a primary foldable screen. The secondary foldable screen has at least one inner screen.

[0122] The main folding screen and the secondary folding screen are located on both sides of the folding edge and share the folding edge. The main folding screen includes a main screen, a mid-frame, and at least one DDIC. In the folded state of the foldable display, the main screen faces one inner screen. In the unfolded state of the foldable display, the main screen and all inner screens are on the same plane. The mid-frame and DDIC are both located on the backlight side of the main screen. There is an accommodating space between the backlight side of the main screen and part of the mid-frame. The DDIC is located in the accommodating space and is electrically connected to the main screen. The DDIC is used to control the main screen and the inner screens.

[0123] The aforementioned foldable displays may include bi-fold displays, tri-fold displays, and quad-fold displays, etc., without specific limitations here.

[0124] In applications, the main folding screen typically includes a SOC, a rear camera assembly, a main circuit board, and a battery. Other structures may also be included; this section only describes structures related to the DDIC location. Therefore, the main folding screen generally has only one main screen. When folded, this main screen faces one of the inner screens in the secondary folding screen, allowing the side of the main folding screen furthest from this inner screen to serve as the back cover of the foldable display. Furthermore, the size of the main folding screen can be determined according to actual needs.

[0125] In applications, the secondary folding screen typically includes a main circuit board and a battery, and other structures may also be included. Here, we will only introduce the structures related to the location of the DDIC.

[0126] It should be understood that "the secondary folding screen has at least one inner screen" means that the secondary folding screen can have only one inner screen, or it can have multiple inner screens; no specific limitation is made here. In the case of a secondary folding screen with multiple inner screens, the size and functions of the multiple inner screens can be the same or different, depending on the actual application.

[0127] The main folding screen and the secondary folding screen are located on opposite sides of the folding edge and share the same folding edge. This means that the main screen of the main folding screen and one inner screen of the secondary folding screen are located on opposite sides of the folding edge and share this folding edge. This folding edge is not an actual touchable edge; it is simply a point where folding is possible. Therefore, even in the unfolded state of the foldable display, the folding edge can still provide users with display information and touch operations.

[0128] In one or more embodiments, the main screen of the main folding screen and all the inner screens of the secondary folding screen are generally mounted on the mid-frame, which provides direct or indirect support.

[0129] In this embodiment of the application, the side of the main screen that is opposite to the light-emitting side is the backlight side of the main screen, where the light-emitting side refers to the side from which light is emitted from the main screen.

[0130] In this application, the method of forming the accommodating space is not limited. For example, the accommodating space can be calculated based on the dimensions of the DDIC, and then the thickness of the mid-frame where the DDIC will be placed can be reduced along a third direction (i.e., the direction perpendicular to the main screen when the foldable display is unfolded). This is done by creating a groove in the mid-frame to form an accommodating space between it and the backlight side of the main screen. Because only the thickness of the mid-frame in the direction perpendicular to the main screen when the foldable display is unfolded is reduced, the overall thickness of the foldable display is not increased. Specifically, the thickness in the direction perpendicular to the main screen when the foldable display is unfolded is not increased, allowing for miniaturization and thinning of foldable phones using this display. For example, the height of the accommodating space along the oz direction can be 0.15mm-0.25mm. For example, the height of the accommodating space along the oz direction can be 0.15mm, 0.18mm, 0.20mm, 0.22mm, or 0.25mm, etc., thus providing a good fit for the DDIC.

[0131] It should be understood that the electrical connection between the display driver and the main screen means either that the display driver is directly electrically connected to the main screen, or that the display driver is electrically connected to the main screen through other structures, such as through an FPC. No specific limitation is made here.

[0132] It should be understood that "the main folding screen includes at least one DDIC" means that the main folding screen may include only one DDIC, or it may include multiple DDICs. The number of DDICs can be determined based on the type of foldable display and the volume of the DDICs. In the case of multiple DDICs, the dimensions and models of the multiple DDICs can be the same or different, depending on the actual needs.

[0133] This application provides a foldable display screen. By placing at least one DDIC in the main folding screen and utilizing the space between the backlight side of the main screen and part of the mid-frame, the DDIC is placed in a way that allows the main screen, DDIC, and mid-frame to coordinate in a direction perpendicular to the main screen when the foldable display screen is unfolded. BTB and other components can also be placed in the main folding screen simultaneously, effectively reducing the trace length of the foldable display screen without significantly increasing its thickness, reducing insertion loss, and improving eye diagram quality. Compared with related technologies, this reduces the need for at least one through-axis FPC trace, greatly reducing the trace length of the foldable display screen and the width of the through-axis FPC, thereby improving the reliability of the folding edge area, making reasonable use of overall system resources, and significantly improving the performance of the foldable display screen.

[0134] Furthermore, when foldable displays are applied to electronic devices, the insertion loss of the electronic devices is small, the eye diagram quality is good, and the performance is excellent.

[0135] The following explanation will focus on foldable displays, specifically bi-fold and tri-fold displays, applied to mobile phones.

[0136] It should be noted that the DDIC in a four-fold display or a display with four or more folds can refer to the design of a two-fold display or a three-fold display. For example, a four-fold display can have one large DDIC, two large DDICs, or three small DDICs. There are no specific limitations here, as long as all DDICs are placed on the main folding screen.

[0137] Example 1 (Double-folding display screen):

[0138] Figure 7 and Figure 8 A schematic diagram is provided showing the position of the first display driver (DDIC A) in the double-folding display screen 03. Wherein, Figure 8 yes Figure 7 A cross-sectional view of the first main screen 101 of the double-folded display screen obtained by cutting along the cutting lines F1F2.

[0139] like Figure 7 and Figure 8 As shown, the dual-folding display screen 03 provided in this application embodiment includes: a main folding screen and a secondary folding screen. The secondary folding screen has a first secondary screen, which includes a first inner screen 102 and a first outer screen (…). Figure 7 and Figure 8 (Not shown in the image), the first inner screen 102 is opposite to the first outer screen.

[0140] The main folding screen includes a first main screen 101, a first middle frame 46, and a first display driver (DDICA). The first main screen 101 and the first inner screen 102 are located on both sides of the first folding edge b4 and share the first folding edge b4. In the folded state of the double-folding display screen 03, the first main screen 101 and the first inner screen 102 face each other. In the unfolded state of the double-folding display screen 03, the first main screen 101 and the first inner screen 102 are on the same plane. The first middle frame 46 and DDICA are both located on the backlight side of the first main screen 101. There is an accommodating space between the backlight side of the first main screen 101 and part of the first middle frame 46. DDICA is located in the accommodating space and is electrically connected to the first main screen 101. DDICA is used to control the first main screen 101, the first inner screen 102, and the first outer screen.

[0141] In the dual-folding display 03, the main folding screen is typically equipped with a first system-on-a-chip 30, a first rear camera 311, and a second rear camera 312. The first rear camera 311 and the second rear camera 312 are usually located on the side of the main folding screen that is opposite to the first main screen 101. In this way, when the dual-folding display 03 is in the folded state, the side equipped with the first rear camera 311 and the second rear camera 312 can be used as the back cover of the dual-folding display 03.

[0142] It should be noted that the first outer screen is usually a non-folding screen, so that when the double-folding display 03 is in the folded state, information can be displayed to the user and touch operations can be performed through the first outer screen.

[0143] It should be understood that the first main screen 101 and the first inner screen 102 are located on both sides of the first folding edge b4 and share the first folding edge b4, meaning that: Figure 7 As shown, one end of the second side b2 of the first main screen is connected to one end of the first folded side b4 through the first side b1 of the first main screen, and the other end of the second side b2 of the first main screen is connected to the other end of the first folded side b4 through the third side b3 of the first main screen.

[0144] In one or more embodiments, DDIC A can be positioned at any location within the accommodating space between the backlight side of the first main screen and the first mid-frame, as long as DDIC A is electrically connected to the first main screen 101. For example, the accommodating space can be calculated based on the dimensions of DDIC A, and then the first mid-frame 46 where DDIC A needs to be placed can be aligned along a third direction (…). Figure 7 and Figure 8 The thickness of the first mid-frame 46 is reduced in the oz direction, i.e., a groove is cut into it to create an accommodating space between it and the backlight side of the first main screen. It should be noted that the oz direction is the direction perpendicular to the first main screen 101 when the double-fold display 03 is in the unfolded state.

[0145] In addition, please refer to Figure 7 In the double-folding display 03, the first board-to-board connector 41 is also set in the main folding screen. For example, the first board-to-board connector 41 can be electrically connected to the first sub-main circuit board 321.

[0146] The dual-folding display provided in this application embodiment places the DDIC A, its associated BTB, and SOC within the main folding screen. Therefore, when connecting DDIC A and the SOC, the wiring between them does not need to pass through areas such as the through-axis FPC area of ​​the foldable display, significantly shortening the wiring length, reducing insertion loss, and improving signal quality. Simultaneously, it reduces the width of the through-axis FPC, improving the reliability of the through-axis FPC area, utilizing overall system resources, and significantly enhancing performance. Consequently, when this dual-folding display is applied to electronic devices, it can greatly improve the overall performance of the electronic device.

[0147] Alternatively, as one possible approach, such as Figure 7 As shown, along the first direction ( Figure 7 (As shown in the ox direction), the distance d1 between DDIC A and the second side b2 of the first main screen is less than the distance d2 between DDIC A and the first folding side b4. It should be noted that the ox direction is the direction parallel to the first main screen 101 when the double-folding display 03 is unfolded.

[0148] The dual-folding display provided in this application embodiment, by placing DDIC A at the edge of the first main screen away from the first inner screen, can make the wiring in the dual-folding display better, and also make the wiring design of signal lines such as gate lines and data lines better, so that they can be electrically connected to DDIC A through a shorter path, thereby improving the performance of the dual-folding display.

[0149] Alternatively, as one possible approach, such as Figure 7 As shown, along the second direction ( Figure 7 As shown in the oy direction, the distance d3 between DDIC A and the first edge b1 of the first main screen and the distance d4 between DDIC A and the third edge b3 of the first main screen are equal. It should be noted that the oy direction is the direction that is parallel to the first main screen 101 and perpendicular to the ox direction when the double-folding display 03 is unfolded.

[0150] The dual-folding display screen provided in this application embodiment, by setting DDIC A at a distance equal to the first side and the third side of the first main screen respectively, can make the wiring in the dual-folding display screen better, and at the same time make the distance between signal lines such as gate lines and data lines and DDIC A as equal as possible, so that better control of the first main screen, the first inner screen and the first outer screen can be achieved through this DDIC A.

[0151] Alternatively, as one possible approach, such as Figure 8As shown, there is a gap between DDIC A and the first middle frame 46, meaning that DDIC A is not in contact with the first middle frame 46.

[0152] The double-folding display screen provided in this application embodiment has a gap between DDIC A and the first middle frame. If DDIC A expands due to heat deformation, the gap can ensure that DDIC A can still be well placed in the accommodating space.

[0153] Alternatively, as an implementable method, combine Figure 7 and Figure 8 As shown, the main folding screen also includes a first main circuit board 32 and a first battery 33. The first main circuit board 32 includes a first sub-main circuit board 321 and a second sub-main circuit board 322, which are electrically connected. The first side c1 of the first battery is on the same side as the first side b1 of the first main screen, the second side c2 of the first battery is on the same side as the second side b2 of the first main screen, the third side c3 of the first battery is on the same side as the third side b3 of the first main screen, and the fourth side c4 of the first battery is on the same side as the first folding side b4. Along the oy direction and the oz direction, the first battery 33 is disposed between the first sub-main circuit board 321 and the second sub-main circuit board 322, and is spaced apart from both the first sub-main circuit board 321 and the second sub-main circuit board 322. The orthographic projection E1 of DDIC A on the first main screen 101 coincides with the orthographic projection E2 of the first battery 33 on the first main screen 101.

[0154] In the application, both the first sub-main circuit board 321 and the second sub-main circuit board 322 can be PCBs. The size and function of the first sub-main circuit board 321 and the second sub-main circuit board 322 can be the same or different, and no specific limitation is made here.

[0155] Electrical connection between the first sub-main circuit board 321 and the second sub-main circuit board 322 means that the first sub-main circuit board 321 and the second sub-main circuit board 322 can be directly electrically connected; or, the first sub-main circuit board 321 and the second sub-main circuit board 322 can be electrically connected through other structures, such as through the first main screen FPC 34, depending on the actual application.

[0156] In application, the shape of the first battery 33 can be any shape such as a cuboid or a cube; no specific limitation is made here. Figure 7 and Figure 8 The first battery 33 is illustrated using a cuboid shape as an example.

[0157] The fact that the first battery 33 is spaced apart from the first sub-main circuit board 321 and the second sub-main circuit board 322 along the oy direction and the oz direction means that the first battery 33 and the first sub-main circuit board 321 and the second sub-main circuit board 322 can not contact each other along the oy direction and the oz direction, leaving gaps so that the expansion of the first battery 33 due to heat deformation will not affect the performance of the double-folding display screen 03.

[0158] The overlap of the orthographic projection E1 of DDIC A on the first main screen 101 and the orthographic projection E2 of the first battery 33 on the first main screen 101 means that: the orthographic projection E1 of DDIC A on the first main screen 101 and the orthographic projection E2 of the first battery 33 on the first main screen 101 partially overlap, or the orthographic projection E1 of DDIC A on the first main screen 101 and the orthographic projection E2 of the first battery 33 on the first main screen 101 completely overlap. Based on current technology, DDIC A is typically small in size; to improve the battery life of the dual-folding display 03, the first battery 33 is made as large as possible. Significantly, as... Figure 8 As shown, the orthographic projection E1 of DDIC A on the first main screen 101 is located within the orthographic projection E2 on the first main screen 101.

[0159] It should be noted that, as Figure 7 As shown, the main folding screen may also include a first wireless charging component 35, which is disposed between the first battery 33 and the first battery back cover along the oz direction and is electrically connected to the first sub-main circuit board 321.

[0160] The dual-folding display screen provided in this application embodiment can make the DDIC A smaller in size and the first battery larger in size. Even if the first battery deforms and expands due to heat, it can still be well placed in the storage space, so that the overall performance of the dual-folding display screen is better.

[0161] Alternatively, as one possible approach, such as Figure 7 As shown, the first secondary screen also includes a second main circuit board 36, a first front-facing camera 37, a second battery 38, and a first outer screen main circuit board 39. The second main circuit board 36 includes a third sub-main circuit board 361 and a fourth sub-main circuit board 362, which are electrically connected. The first side c5 of the second battery is on the same side as the first side b5 of the first inner screen, the second side c6 of the second battery is on the same side as the second side b6 of the first inner screen, the third side c7 of the second battery is on the same side as the third side b7 of the first inner screen, and the fourth side c8 of the second battery is on the same side as the first folding side b4. Along the oy direction and the oz direction, the second battery 38 is disposed between the third sub-main circuit board 361 and the fourth sub-main circuit board 362, and is spaced apart from both the third sub-main circuit board 361 and the fourth sub-main circuit board 362.

[0162] Meanwhile, the first front-facing camera 37 is electrically connected to the third sub-main circuit board 361; the first external screen main circuit board 39 is electrically connected to the third sub-main circuit board 361 and the fourth sub-main circuit board 362 respectively, and the first external screen main circuit board 39 overlaps with the second battery 38 along the oz direction; the double-folding display screen 03 also includes a first through-shaft 40, which is electrically connected to the first sub-main circuit board 321 and the third sub-main circuit board 361 respectively, and the first through-shaft 40 overlaps with the first folding edge b4 along the oz direction.

[0163] In the application, both the third sub-main circuit board 361 and the fourth sub-main circuit board 362 can be PCBs. The size and function of the third sub-main circuit board 361 and the fourth sub-main circuit board 362 can be the same or different, and no specific limitation is made here.

[0164] The electrical connection between the third sub-main circuit board 361 and the fourth sub-main circuit board 362 means that the third sub-main circuit board 361 and the fourth sub-main circuit board 362 can be directly electrically connected; or, the third sub-main circuit board 361 and the fourth sub-main circuit board 362 can be electrically connected through other structures, such as through the first sub-screen FPC 10, depending on the actual application.

[0165] In application, the shape of the second battery 38 can be any shape such as a cuboid or a cube; no specific limitation is made here. Figure 7 and Figure 8 The second battery 38 is illustrated using a cuboid shape as an example.

[0166] The second battery 38 is spaced apart from the third sub-main circuit board 361 and the fourth sub-main circuit board 362 along the oy and oz directions, meaning that the second battery 38 does not contact the third sub-main circuit board 361 and the fourth sub-main circuit board 362 along the oy and oz directions, leaving gaps so that the expansion of the second battery 38 due to heat deformation will not affect the performance of the double-folding display screen 03.

[0167] In the application, the electrical connection between the first front-facing camera 37 and the third sub-main circuit board 361 means that the first front-facing camera 37 can be directly electrically connected to the third sub-main circuit board 361, or the first front-facing camera 37 can be electrically connected to the third sub-main circuit board 361 through other structures, such as through an FPC. No specific limitation is made here.

[0168] In the application, the first external screen main circuit board 39 can be an FPC. Here, there are no specific limitations on the size and function of the first external screen main circuit board 39.

[0169] The electrical connection of the first external screen main circuit board 39 to the third sub-main circuit board 361 and the fourth sub-main circuit board 362 respectively means that: the first external screen main circuit board 39 can be directly electrically connected to the third sub-main circuit board 361 and the fourth sub-main circuit board 362 respectively; or, the first external screen main circuit board 39 can be electrically connected to the third sub-main circuit board 361 and the fourth sub-main circuit board 362 respectively through other structures, such as through an FPC; or, the first external screen main circuit board 39 can be directly electrically connected to the third sub-main circuit board 361 and electrically connected to the fourth sub-main circuit board 362 through other structures; or, the first external screen main circuit board 39 can be electrically connected to the third sub-main circuit board 361 and directly electrically connected to the fourth sub-main circuit board 362 through other structures. No specific limitation is made here.

[0170] The overlap between the first outer screen main circuit board 39 and the second battery 38 along the oz direction means that the first outer screen main circuit board 39 can pass over the second battery 38, but will not contact the second battery 38.

[0171] In the application, the first through-shaft 40 can be an FPC, and there are no specific limitations on the size and function of the first through-shaft 40. The first through-shaft 40 being electrically connected to the first sub-main circuit board 321 and the third sub-main circuit board 361 respectively means: the first through-shaft 40 can be directly electrically connected to the first sub-main circuit board 321 and the third sub-main circuit board 361 respectively; or, the first through-shaft 40 can be electrically connected to the first sub-main circuit board 321 and the third sub-main circuit board 361 respectively through other structures, such as through an FPC; or, the first through-shaft 40 can be directly electrically connected to the first sub-main circuit board 321 and electrically connected to the third sub-main circuit board 361 through other structures; or, the first through-shaft 40 can be electrically connected to the first sub-main circuit board 321 through other structures and directly electrically connected to the third sub-main circuit board 361. No specific limitations are made here.

[0172] Along the oz direction, the first through shaft 40 and the first folded edge b4 overlap, meaning that along the oz direction, the first through shaft 40 crosses the first folded edge b4.

[0173] Please refer to this again. Figure 8 The main folding screen may also include a first crystal film 45, a first adhesive 43, a first buffer 44, a first bonding member 47, a first battery back cover 48, a first connecting structure 42, a first bracket 491, and a second bonding member 492.

[0174] The first connection structure 42 can be an FPC or the like. The first connection structure 42 can include a first sub-connection structure 421 and a second sub-connection structure 422. The first sub-connection structure 421 and the second sub-connection structure 422 can be electrically connected or non-electrically connected. The size and function of the first sub-connection structure 421 and the second sub-connection structure 422 can be the same or different, and no specific limitation is made here.

[0175] The material of the first adhesive 43 can be a mixture of resin and additives, etc. The first adhesive 43 can include a first sub-adhesive 431, a second sub-adhesive 432 and a third sub-adhesive 433, etc. The specific types of the first sub-adhesive 431, the second sub-adhesive 432 and the third sub-adhesive 433 can be the same or different, and no specific limitation is made here.

[0176] The first buffer element 44 can be conductive foam, etc., to provide a buffering effect.

[0177] The first adhesive 47 and the second adhesive 492 can be glue or the like, thus serving to achieve an adhesive effect.

[0178] In the application, one end of the first flip-chip film 45 is connected to the light-emitting side of the first main screen 101, and the other end is folded to the backlight side of the first main screen 101 and then connected to the first main screen 101. Specifically, the first flip-chip film 45 folded to the backlight side of the first main screen 101 is connected to the first sub-connection structure 421 disposed on the backlight side of the first main screen 101. The first sub-connection structure 421 is disposed on the backlight side of the first main screen 101 and connected to the first main screen 101. DDIC A is connected to the first main screen 101 through the first sub-connection structure 421.

[0179] In the application, the first battery 33 is disposed between DDIC A and the first sub-connection structure 421 and the first battery back cover 48 along the oz direction, and is connected to the first battery back cover 48 through the first buffer 44. The first battery 33 has a gap between itself and the first middle frame 46 along the ox direction, thereby providing space for the first battery 33 to expand after deformation due to heat.

[0180] In the application, the first middle frame 46 plays a supporting role. The first middle frame 46 includes a first sub-middle frame 461, a second sub-middle frame 462, a third sub-middle frame 463, and a fourth sub-middle frame 464. Part of the first sub-frame 461 is disposed between the first main screen 101 and the first battery 33 along the oz direction, and has an accommodating space between it and the first main screen 101. DDIC A is disposed in this accommodating space. The first sub-frame 461 is also connected to the backlight side of the first main screen 101 through the first sub-connecting structure 421 and to the first battery 33 through the second sub-adhesive 432. The remaining part of the first sub-frame 461 is disposed on one side of the first battery 33 and is located between the first sub-connecting structure 421 and the first battery back cover 48 along the oz direction. The first sub-frame 461 and the first battery 33 are also provided with a second sub-connecting structure 422 and a first sub-adhesive 431. One end of the second sub-connecting structure 422 is connected to the first sub-frame 461 through the first sub-adhesive 431, and the other end is directly connected to the first battery 33. The first sub-frame 461 is also connected to the first battery back cover 48 through the first adhesive 47. The second sub-frame 462 and the third sub-adhesive 433 are disposed along the ox direction on one side of the second sub-connecting structure 422 and the first sub-adhesive 431, and are located between a portion of the first sub-frame 461 and the first battery 33. One end of the second sub-frame 462 is directly connected to the first sub-frame 461, and the other end is connected to the first battery 33 through the third sub-adhesive 433. The third sub-frame 463 is disposed on the side of the first sub-frame 461 away from the first battery 33 and is connected to the first sub-frame 461. The third sub-frame 463 is also located between the first flip-chip film 45 and the first battery back cover 48, and has a gap between it and the first flip-chip film 45. The third sub-frame 463 is connected to the first battery back cover 48 through the first adhesive 47. The fourth sub-frame 464 is located on the side of the third sub-frame 463 away from the first battery 33 and is connected to the third sub-frame 463. The fourth sub-frame 464 is connected to the back cover 48 of the first battery through the first adhesive 47. The fourth sub-frame 464 is connected to the first bracket 491 through the second adhesive 492. The first bracket 491 is also used to support the edge of the light-emitting side of the first main screen 101.

[0181] For example, if the thickness of the double-folding display 03 along the oz direction is large enough, the DDIC A can be protected by cutting out the portion of the first sub-frame 461 located between the first main screen 101 and the second battery 33, for example, cutting out about 0.2mm, so that the DDIC A can be placed in the accommodating space.

[0182] It should be noted that, Figure 7 and Figure 8 This is to illustrate DDIC A, so only some structures related to the location of DDIC A are shown; other structures are not shown, but are not limited to these structures.

[0183] The dual-folding display provided in this application embodiment fully utilizes the stacking space of the main folding screen by placing the DDIC A within the main folding screen. Specifically, through the reasonable coordination and staggered arrangement of the first mid-frame, first battery, and first main circuit board in the oz direction, shorter components or no components are placed in the upper and lower spaces of the first main circuit board in the DDIC area. Narrow strips can be used to complete bottleneck wiring, minimizing the impact on the overall oz-direction space. Simultaneously, the BTB is also placed within the main folding screen, minimizing resource waste from the screen D-PHY traces running from the first sub-screen to the main folding screen. This reduces trace length (e.g., approximately 270mm) and impedance abrupt changes at multiple transitions, reducing the impact on eye diagram quality and the number of through-axis BTBs, thus saving layout area (e.g., approximately 40mm²). 2 ).

[0184] Example 2 (G-shaped triple-fold display screen):

[0185] Figures 9 to 12 A schematic diagram is provided showing the positions of the second display driver (DDIC B) and the third display driver (DDIC C) on a G-shaped triple-fold display screen 04. Figure 11 and Figure 12 They are Figure 10 A cross-sectional view of the G-shaped triple-fold display screen 04 obtained by cutting along cutting lines F1 and F2.

[0186] like Figures 9 to 12 As shown, the G-shaped triple-folding display screen 04 provided in this application embodiment includes: a main folding screen and a secondary folding screen. The secondary folding screen has a second secondary screen and a third secondary screen. The second secondary screen includes a second inner screen 104 and a second outer screen 106, with the second inner screen 104 and the second outer screen 106 facing away from each other. The third secondary screen includes a third inner screen 105.

[0187] The main folding screen includes a second main screen 103, a second middle frame 87, a second display driver (DDIC B), and a third display driver (DDIC C). The second main screen 103 and the second inner screen 104 are located on both sides of the second folding edge b11 and share the second folding edge b11. The second inner screen 104 and the third inner screen 105 are located on both sides of the third folding edge b14 and share the third folding edge b14. In the folded state of the G-shaped triple-folding display screen 04, the second main screen 103 and the third inner screen 105 face the second inner screen 104, and the third inner screen 105 is sandwiched between the second main screen 103 and the second inner screen 104. In the unfolded state of the G-shaped triple-folding display screen 04, the second main screen 103, the second inner screen 104, and the third inner screen 105 are on the same plane. The second middle frame 87, DDIC B, and DDIC C are also present. C is located on the backlight side of the second main screen 103. There is an accommodating space between the backlight side of the second main screen 103 and part of the second middle frame 87. DDIC B and DDIC C are located in the accommodating space and are electrically connected to the second main screen 103. DDIC B and DDIC C are separate and spaced apart. DDIC B and DDIC C are used together to control the second main screen 103, the second inner screen 104, the second outer screen 106 and the third inner screen 105.

[0188] In the G-shaped triple-fold display 04, the main folding screen is typically equipped with a SOC (System-on-Chips). Figures 9 to 12 (Not shown), third rear camera 511 and fourth rear camera 512. The third rear camera 511 and fourth rear camera 512 are usually located on the side of the main folding screen opposite to the second main screen 103. In this way, when the G-shaped triple folding display 04 is in the folded state, the side with the third rear camera 511 and fourth rear camera 512 can be used as the back cover of the G-shaped triple folding display 04.

[0189] It should be noted that the second external screen is usually a non-folding screen, so that when the G-shaped triple-fold display 04 is in the folded state, information can be displayed to the user and touch operations can be performed through the second external screen.

[0190] It should be understood that the second main screen 103 and the second inner screen 104 are located on both sides of the second folding edge b11 and share the second folding edge b11, meaning that: Figure 10As shown, one end of the second side b9 of the second main screen is connected to one end of the second folded side b11 via the first side b8 of the second main screen, and the other end of the second side b9 of the second main screen is connected to the other end of the second folded side b11 via the third side b10 of the second main screen. Furthermore, the second inner screen 104 and the third inner screen 105 are respectively located on both sides of the third folded side b14 and share the third folded side b14, meaning that... Figure 10 As shown, one end of the second side b16 of the third inner screen is connected to one end of the third folded side b14 via the first side b15 of the third inner screen, and the other end of the second side b16 of the third inner screen is connected to the other end of the third folded side b14 via the third side b17 of the third inner screen. Furthermore, both ends of the first side b12 of the second inner screen are connected to one end of the second folded side b11 and one end of the third folded side b14, respectively, and both ends of the second side b13 of the second inner screen are connected to the other ends of the second folded side b11 and the third folded side b14, respectively.

[0191] In this embodiment of the application, the side of the second main screen 103 that is opposite to the light-emitting side is the backlight side of the second main screen. Here, the light-emitting side refers to the side from which light is emitted from the second main screen 103.

[0192] In one or more embodiments, DDIC B and DDIC C can be located at any position in the accommodating space between the backlight side of the second main screen and the second middle frame 87, as long as DDIC B and DDIC C are electrically connected to the second main screen 103.

[0193] In addition, such as Figure 10 As shown, the second board-to-board connector 55 is located in the main folding screen, specifically, the second board-to-board connector 55 can be fastened to the fifth sub-main circuit board 501.

[0194] The tri-fold display screen provided in this application embodiment, by setting two DDICs, can maintain the resolution of the tri-fold display screen while increasing the screen size. Specifically, DDIC B and DDIC C are placed within the accommodating space of the second middle frame and the second main screen, and the BTB associated with DDIC B and DDIC C is simultaneously placed in the main folding screen. This way, when DDIC B and DDIC C are electrically connected to the SOC, the traces between DDIC B and DDIC C and the SOC do not need to pass through the through-axis FPC area of ​​the tri-fold display screen, significantly shortening the trace length, reducing the insertion loss of the tri-fold display screen, and improving the signal quality of the tri-fold display screen. At the same time, the width of the through-axis FPC can be reduced, improving the reliability of the through-axis FPC area and significantly improving its performance by utilizing the overall system resources. Therefore, when this tri-fold display screen is applied to electronic devices, it can significantly improve the overall performance of the electronic devices.

[0195] Alternatively, as one possible approach, such as Figure 10 As shown, along the ox direction, the distance d5 between DDIC B and the second side b9 of the second main screen is less than the distance d6 between DDIC B and the second folded side b11, and the distance d7 between DDIC C and the second side b9 of the second main screen is less than the distance d8 between DDIC C and the second folded side b11.

[0196] Of course, it's also possible that, along the ox direction, the distance between DDIC B and the second edge b9 of the second main screen is equal to the distance between DDIC B and the second folded edge b11, or the distance between DDIC B and the second edge b9 of the second main screen is greater than the distance between DDIC B and the second folded edge b11. No specific limitations are made here. DDIC C can be referenced from DDIC B, and will not be elaborated further here.

[0197] In applications, the size, model, and type of DDIC B and DDIC C can be the same or different; no specific restrictions are made here.

[0198] The three-fold display screen provided in this application provides better wiring by placing both DDIC B and DDIC C at the edge of the second main screen away from the second inner screen. This also makes the wiring design of signal lines such as gate lines and data lines better, and allows for electrical connection with DDIC B and DDIC C through a shorter path, thereby improving the performance of the three-fold display screen.

[0199] Alternatively, as one possible approach, such as Figure 10 As shown, along the oy direction, the distance d9 between DDIC B and the first side b8 of the second main screen is less than the distance d10 between DDIC B and the third side b10 of the second main screen, and the distance d11 between DDIC C and the first side b8 of the second main screen is greater than the distance d12 between DDIC C and the third side b10 of the second main screen.

[0200] Of course, it's also possible that, along the oy direction, the distance between DDIC B and the first edge b8 of the second main screen is equal to the distance between DDIC B and the third edge b10 of the second main screen, or the distance between DDIC B and the first edge b8 of the second main screen is greater than the distance between DDIC B and the third edge b10 of the second main screen. Similarly, it's also possible that, along the oy direction, the distance between DDIC C and the first edge b8 of the second main screen is equal to the distance between DDIC C and the third edge b10 of the second main screen, or the distance between DDIC C and the first edge b8 of the second main screen is less than the distance between DDIC C and the third edge b10 of the second main screen; no specific limitations are imposed here.

[0201] The tri-fold display screen provided in this application embodiment, by setting DDIC B close to the first side of the second main screen and DDIC C close to the third side of the second main screen, allows DDIC B and DDIC C to control a portion of each screen respectively. For example, DDIC B controls the upper part of each screen and DDIC C controls the lower part of each screen. This allows for better wiring and enables better control of the second main screen, the second inner screen, the second outer screen, and the third inner screen through these two DDICs.

[0202] Alternatively, as one possible approach, such as Figure 11 and Figure 12 As shown, there is a gap between DDIC B and the second middle frame 87, that is, DDIC B does not contact the second middle frame 87; there is a gap between DDIC C and the second middle frame 87, that is, DDIC C does not contact the second middle frame 87.

[0203] The tri-fold display screen provided in this application embodiment has gaps between DDIC B and DDIC C and the second middle frame 87, respectively. If DDIC B and DDIC C expand due to heat deformation, the gaps can ensure that DDIC B and DDIC C can still be well placed in the accommodating space and prevent DDIC B and DDIC C from becoming brittle due to stress.

[0204] Alternatively, as an implementable method, combine Figures 10 to 12As shown, the main folding screen also includes a third main circuit board 50, a third battery 52, a fourth battery 63, and a fifth battery 72. The third main circuit board 50 includes a fifth sub-main circuit board 501 and a sixth sub-main circuit board 502, which are electrically connected. The fourth main circuit board 60 includes a seventh sub-main circuit board 601 and an eighth sub-main circuit board 602, which are electrically connected. The fifth main circuit board 70 includes a ninth sub-main circuit board 701 and a tenth sub-main circuit board 702, which are electrically connected. The first side c9 of the third battery is located on the same side as the first side b8 of the second main screen, and the second side c10 of the third battery is located on the same side as the second side b9 of the second main screen. c11 is on the same side as the third side b10 of the second main screen; c12 is on the same side as the second folding edge b11; c13 is on the same side as the first side b12 of the second inner screen; c14 is on the same side as the second folding edge b11; c15 is on the same side as the second side b13 of the second inner screen; c16 is on the same side as the third folding edge b14; c17 is on the same side as the first side b15 of the third inner screen; c18 is on the same side as the second side b16 of the third inner screen; c19 is on the same side as the third side b17 of the third inner screen; c20 is on the same side as the third folding edge b14.

[0205] Along the oy and oz directions, the third battery 52 is disposed between the fifth sub-main circuit board 501 and the sixth sub-main circuit board 502, and is spaced apart from both the fifth and sixth sub-main circuit boards 501. The fourth battery 63 is disposed between the seventh and eighth sub-main circuit boards 601, and is spaced apart from both the seventh and eighth sub-main circuit boards 601. The fifth battery 72 is disposed between the ninth and tenth sub-main circuit boards 701, and is spaced apart from both the ninth and tenth sub-main circuit boards 701. The orthographic projection E3 of DDIC B on the second main screen 103 coincides with the orthographic projection E4 of the fifth sub-main circuit board 501 on the second main screen 103. Furthermore, the fifth sub-main circuit board 501 extends between the second side c10 of the third battery and the second side b9 of the second main screen. The orthographic projection E5 of C on the second main screen 103 coincides with the orthographic projection E6 of the portion of the fifth sub-main circuit board 501 located between the second side c10 of the third battery and the second side b9 of the second main screen on the second main screen 103.

[0206] In the application, the fifth sub-main circuit board 501, the sixth sub-main circuit board 502, the seventh sub-main circuit board 601, the eighth sub-main circuit board 602, the ninth sub-main circuit board 701 and the tenth sub-main circuit board 702 can all be PCBs. The size and function of each sub-main circuit board can be the same or different, and no specific restrictions are made here.

[0207] The electrical connection between the fifth sub-main circuit board 501 and the sixth sub-main circuit board 502 means that the fifth sub-main circuit board 501 and the sixth sub-main circuit board 502 can be directly electrically connected; or, the fifth sub-main circuit board 501 and the sixth sub-main circuit board 502 can be electrically connected through other structures, such as through the second main screen FPC 53, subject to actual application. The electrical connection between the seventh sub-main circuit board 601 and the eighth sub-main circuit board 602 means that the seventh sub-main circuit board 601 and the eighth sub-main circuit board 602 can be directly electrically connected; or, the seventh sub-main circuit board 601 and the eighth sub-main circuit board 602 can be electrically connected through other structures, subject to actual application. The electrical connection between the ninth sub-main circuit board 701 and the tenth sub-main circuit board 702 means that the ninth sub-main circuit board 701 and the tenth sub-main circuit board 702 can be directly electrically connected; or, the ninth sub-main circuit board 701 and the tenth sub-main circuit board 702 can be electrically connected through other structures, such as through the third inner screen FPC 73, subject to actual application.

[0208] In application, the shapes of the third battery 52, the fourth battery 63, and the fifth battery 72 can be any shape such as a cuboid or a cube; no specific limitations are imposed here. Figure 10 and Figure 12 The shapes of the third battery 52, the fourth battery 63, and the fifth battery 72 are all illustrated using cuboids as examples.

[0209] The fact that the third battery 52 is spaced apart from the fifth and sixth sub-main circuit boards 501 and 502 along both the oy and oz directions means that the third battery 52 and the fifth and sixth sub-main circuit boards 501 and 502 do not need to contact each other along both the oy and oz directions, leaving gaps. This allows the third battery 52 to expand due to heat without affecting the performance of the G-shaped triple-fold display screen 04. The positional relationship between the fourth battery 63 and the seventh and eighth sub-main circuit boards 601 and 602, as well as the positional relationship between the fifth battery 72 and the ninth and tenth sub-main circuit boards 701 and 702, can be referenced from the third battery 52 and will not be repeated here.

[0210] The fact that the orthographic projection E3 of DDIC B on the second main screen 103 coincides with the orthographic projection E4 of the fifth sub-main circuit board 501 on the second main screen 103 means that: the orthographic projection E3 of DDIC B on the second main screen 103 partially coincides with the orthographic projection E4 of the fifth sub-main circuit board 501 on the second main screen 103, or that the orthographic projection E3 of DDIC B on the second main screen 103 completely coincides with the orthographic projection E4 of the fifth sub-main circuit board 501 on the second main screen 103. The fact that the orthographic projection E5 of DDIC C on the second main screen 103 coincides with the orthographic projection E6 of the portion of the fifth sub-main circuit board 501 located between the second side c10 of the third battery and the second side b9 of the second main screen on the second main screen 103 means that: the orthographic projection E5 of DDIC C on the second main screen 103 and the portion of the fifth sub-main circuit board 501 located between the second side c10 of the third battery and the second side b9 of the second main screen on the second main screen 103 partially coincide, or, the orthographic projection E5 of DDIC C on the second main screen 103 and the portion of the fifth sub-main circuit board 501 located between the second side c10 of the third battery and the second side b9 of the second main screen on the second main screen 103 completely coincide with the orthographic projection E6 of DDIC C on the second main screen 103. Based on current technology, DDIC B and DDIC C are typically small in size; therefore, to improve the battery life of the G-shaped triple-folding display 04, the third battery 52 is made as large as possible. Significantly, as... Figure 11 As shown, the orthographic projection E3 of DDIC B on the second main screen 103 is positioned within the orthographic projection E4 of the fifth sub-main circuit board 501 on the second main screen 103. Significantly, as... Figure 12 As shown, the portion of DDIC C projected onto the second main screen 103 by E5 is located between the second side c10 of the third battery and the second side b9 of the second main screen and is within the projection E6 of the second main screen 103.

[0211] It should be noted that, as Figure 10 As shown, the main folding screen may also include a second wireless charging component 56, which is disposed in the oz direction between the third battery 52 and the second battery back cover, and is electrically connected to the fifth sub-main circuit board 501.

[0212] The tri-fold display screen provided in this application embodiment can make the DDIC B and DDIC C smaller in size. Since DDIC B and DDIC C do not occupy the space of the third battery, the third battery can be larger in size, have a higher battery capacity, and better battery life, thereby making the overall performance of the tri-fold display screen better.

[0213] Alternatively, as an achievable approach, in order to minimize the overall thickness increase of the G-shaped triple-fold display 04, the second main screen FPC 53, the second outer screen main circuit board 54, and the second wireless charging component 56 share a common thickness and are positioned above the third battery 52. ​​This allows the second main screen FPC 53 and the second outer screen main circuit board 54 to be directly fastened to the portion of the fifth sub-main circuit board 501 extending between the second side c10 of the third battery and the second side b9 of the second main screen using the area below the second wireless charging component 56. At the same time, the second middle frame 87 is disassembled in the vicinity of the main folding screen containing the third battery 52 to reduce the overall thickness of the G-shaped triple-fold display 04 and provide more space for the third battery 52.

[0214] like Figure 10 As shown, the main folding screen may also include a third rear camera 511 and a fourth rear camera 512; the second sub-screen of the secondary folding screen may also include a first sub-audio 611 and a first sub-camera 612, both of which are electrically connected to the seventh sub-main circuit board 601; the third sub-screen may also include a second sub-audio 711 and a second sub-camera 712, both of which are electrically connected to the ninth sub-main circuit board 701; the G-shaped triple-folding display 04 may also include a second outer screen main circuit board 54, a second through-axis 80, and a third through-axis 90, the second outer screen main circuit board 54 being divided into The portion of the fifth sub-main circuit board 501 extending between the second side c10 of the third battery and the second side b9 of the second main screen is electrically connected to the eighth sub-main circuit board 602, and along the oz direction, the second outer screen main circuit board 54 overlaps with the third battery 52 and the second folding edge b11 respectively; the second through shaft 80 is electrically connected to the fifth sub-main circuit board 501 and the seventh sub-main circuit board 601 respectively, and along the oz direction, the second through shaft 80 overlaps with the second folding edge b11; the third through shaft 90 is electrically connected to the seventh sub-main circuit board 601 and the ninth sub-main circuit board 701 respectively, and along the oz direction, the third through shaft 90 overlaps with the third folding edge b14.

[0215] Thus, the seventh sub-main circuit board 601 and the eighth sub-main circuit board 602 can be electrically connected through the second outer screen main circuit board 54, the second through shaft 80 and the third through shaft 90, the second main screen FPC 53 and the third inner screen FPC 73.

[0216] In the application, the electrical connection of the first sub-audio 611 and the first sub-camera 612 to the seventh sub-main circuit board 601 means that the first sub-audio 611 and the first sub-camera 612 are both directly electrically connected to the seventh sub-main circuit board 601, or the first sub-audio 611 and the first sub-camera 612 can be electrically connected to the seventh sub-main circuit board 601 through other structures, such as through an FPC. No specific limitation is made here. The electrical connection method of the second sub-audio 711 and the second sub-camera 712 to the ninth sub-main circuit board 701 can refer to that of the first sub-audio 611 and the first sub-camera 612, and will not be elaborated further here.

[0217] In the application, the second external screen main circuit board 54 can be an FPC. Here, there are no specific limitations on the size and function of the second external screen main circuit board 54.

[0218] The electrical connection of the second outer screen main circuit board 54 to the portion of the fifth sub-main circuit board extending to the third battery between the second side c10 and the second side b9 of the second main screen, and to the eighth sub-main circuit board 602 means that: the second outer screen main circuit board 54 can be directly electrically connected to the portion of the fifth sub-main circuit board extending to the third battery between the second side c10 and the second side b9 of the second main screen, and to the eighth sub-main circuit board 602; or, the second outer screen main circuit board 54 can be connected to the second main screen via other structures, such as via an FPC, to the portion of the fifth sub-main circuit board extending to the third battery between the second side c10 and the second main screen. The portion between the second side b9 and the eighth sub-main circuit board 602 can be electrically connected. Alternatively, the second outer screen main circuit board 54 can be directly electrically connected to the portion between the second side c10 of the fifth sub-main circuit board extending to the third battery and the second side b9 of the second main screen, and can also be electrically connected to the eighth sub-main circuit board 602 through other structures. Or, the second outer screen main circuit board 54 can be electrically connected to the portion between the second side c10 of the fifth sub-main circuit board extending to the third battery and the second side b9 of the second main screen through other structures, and can also be directly electrically connected to the eighth sub-main circuit board 602. No specific limitations are made here.

[0219] Along the oz direction, the second outer screen main circuit board 54 overlaps with the third battery 52 and the second folding edge b11, meaning that along the oz direction, the second outer screen main circuit board 54 can cross the third battery 52 and the second folding edge b11, but will not contact the third battery 52.

[0220] In the application, the second through shaft 80 and the third through shaft 90 can be FPCs. Here, there are no specific limitations on the size and function of the second through shaft 80 and the third through shaft 90.

[0221] The second through shaft 80 being electrically connected to the fifth sub-main circuit board 501 and the seventh sub-main circuit board 601 respectively means that: the second through shaft 80 can be directly electrically connected to the fifth sub-main circuit board 501 and the seventh sub-main circuit board 601 respectively; or, the second through shaft 80 can be electrically connected to the fifth sub-main circuit board 501 and the seventh sub-main circuit board 601 respectively through other structures, such as through an FPC; or, the second through shaft 80 can be directly electrically connected to the fifth sub-main circuit board 501 and electrically connected to the seventh sub-main circuit board 601 through other structures; or, the second through shaft 80 can be electrically connected to the fifth sub-main circuit board 501 through other structures and directly electrically connected to the seventh sub-main circuit board 601. No specific limitation is made here.

[0222] The overlap between the second through-axis 80 and the second folded edge b11 along the oz direction means that the second through-axis 80 crosses the second folded edge b11. The third through-axis 90 can be set with reference to the second through-axis 80, and will not be described in detail here.

[0223] The aforementioned second wireless charging component can be a wireless charging coil, etc.

[0224] It should be noted that since the second sub-screen has a second outer screen 106, and the second outer screen 106 is connected from the second sub-screen to the DDIC C through the second outer screen main circuit board 54, the location of BTB has a height limit along the oz direction. Therefore, the main folding screen needs to be designed with a sixth sub-main circuit board 502 electrically connected to the second outer screen main circuit board 54.

[0225] Please refer to this again. Figure 11 The main folding screen may also include a second crystal film 89, a second buffer 84, a third adhesive 86, a second battery back cover 85, a second connecting structure 811, a second bracket 882 and a fourth adhesive 881, a first electronic component 821, a second electronic component 822, a third electronic component 823, a fourth electronic component 824, a fifth electronic component 825, a sixth electronic component 826 and a seventh electronic component 827.

[0226] The second connection structure 811 can be an FPC, etc., and the DDIC B can be set on the second connection structure 811 and connected to the backlight side of the second main screen through the second connection structure 811.

[0227] The second buffer 84 may include conductive foam, etc., to provide a buffering effect.

[0228] The third adhesive component 86 may include glue or the like, thereby serving an adhesive function.

[0229] The first electronic component 821, the second electronic component 822, the third electronic component 823, the fourth electronic component 824, the fifth electronic component 825, the sixth electronic component 826, and the seventh electronic component 827 may include any one of capacitors, inductors, and resistors.

[0230] In the application, one end of the second flip-chip film 89 is connected to the light-emitting side of the second main screen 103, and the other end is folded to the backlight side of the second main screen 103 and then connected to the second main screen 103. Specifically, the second flip-chip film 89 folded to the backlight side of the second main screen 103 is connected to the second connection structure 811 provided on the backlight side of the second main screen 103.

[0231] In the application, the second middle frame 87 serves a supporting function and includes a fifth sub-middle frame 871, a sixth sub-middle frame 872, and a seventh sub-middle frame 873. A portion of the fifth sub-middle frame 871 is positioned along the oz direction between the second main screen 103 and the fifth sub-main circuit board 501, and has a accommodating space between it and the second main screen 103. The DDIC B is disposed within this accommodating space. The fifth sub-middle frame 871 is also connected to the backlight side of the second main screen 103 via a second connecting structure 811. This portion of the fifth sub-middle frame 871 has a accommodating space between it and the fifth sub-main circuit board 501, within which are disposed a first electronic component 821, a second electronic component 822, a third electronic component 823, and a fourth electronic component 824. The remaining portion of the fifth sub-middle frame 871 is positioned on one side of the fifth sub-main circuit board 501 and is located along the oz direction between the second main screen 103 and the second battery back cover 85. The sixth sub-frame 872 is disposed along the ox direction on the side of the fifth sub-frame 871 away from the fifth sub-main circuit board 501 and is connected to the fifth sub-frame 871. The sixth sub-frame 872 is also located between the second flip-chip film 89 and the second battery back cover 85, and has a gap with the second flip-chip film 89. The sixth sub-frame 872 is connected to the second battery back cover 85 through the third adhesive 86. The seventh sub-frame 873 is disposed on the side of the sixth sub-frame 872 away from the fifth sub-main circuit board 501 and is connected to the sixth sub-frame 872. The sixth sub-frame 872 is also connected to the second battery back cover 85 through the third adhesive 86. The sixth sub-frame 872 is also connected to the second bracket 882 through the fourth adhesive 881. The second bracket 882 can also support the edge of the light-emitting side of the second main screen 103.

[0232] For example, if the thickness of the G-shaped tri-fold display 04 along the oz direction is large enough, the DDIC B can be placed in the accommodating space by cutting out the portion of the fifth sub-frame 871 located between the second main screen 103 and the fifth sub-main circuit board 501, for example, cutting out about 0.2mm. This completes the protection of the DDIC B.

[0233] It should be noted that, Figure 10 and Figure 11 This is to illustrate the location of DDIC B, so only some structures related to the location of DDIC B are shown; other structures are not shown, but are not limited to these structures.

[0234] Therefore, DDIC B can utilize the local height limitation at the position of the fifth sub-main circuit board 501 to arrange other electronic components at different heights, so that DDIC B can be embedded in the accommodating space formed by the second middle frame and the second main screen. The traces of the second outer screen are directly attached to the BTB of the second main screen through DDIC B, and then through the third main circuit board to the SOC, thus shortening the D-PHY trace length.

[0235] Please refer to this again. Figure 12 The main folding screen may also include a second crystal film 89, a second adhesive 91, a second buffer 84, a third adhesive 86, a second battery back cover 85, a third connecting structure 812, a second bracket 882, a fourth adhesive 881, a third board-to-board connector 921, an eighth electronic component 828, a ninth electronic component 829, and a first flexible circuit board 93.

[0236] The third connection structure 812 can be an FPC, etc. The DDIC C can be set on the third connection structure 812 and connected to the backlight side of the second main screen through the third connection structure 812. The second flip-chip film 89 folded to the backlight side of the second main screen 103 is connected to the third connection structure 812 set on the backlight side of the second main screen 103.

[0237] The eighth electronic component 828 and the ninth electronic component 829 may include any one of capacitors, inductors, and resistors.

[0238] In application, the second middle frame 87 serves a supporting function. It can be disassembled into components, consisting of disassembled middle frame parts and the main middle frame body, with the disassembled parts connected to the main body. Specifically, the second middle frame 87 includes an eighth sub-middle frame 874, a ninth sub-middle frame 875, a tenth sub-middle frame 876, and a first middle frame disassembled part 877. Part of the eighth sub-frame 874 is disposed between the second main screen 103 and the fifth sub-main circuit board 501 along the oz direction, and has an accommodating space between it and the second main screen 103. The DDIC C is disposed in this accommodating space. The eighth sub-frame 874 also extends between the third battery 52 and the second board-to-board connector 55 and the third board-to-board connector 921, and is connected to the first flexible circuit board 93. This part of the eighth sub-frame 874 is connected to the first sub-frame component 877. The first sub-frame component 877 is also connected to the third battery 52 through the second adhesive 91. At the same time, the eighth sub-frame 874 is also connected to the backlight side of the second main screen 103 through the third connecting structure 812. The remaining part of the eighth sub-frame 874 is disposed on one side of the fifth sub-main circuit board 501 and is located between the second main screen 103 and the second battery back cover 85 along the oz direction. The ninth sub-frame 875 is disposed along the ox direction on the side of the eighth sub-frame 874 away from the fifth sub-main circuit board 501 and is connected to the eighth sub-frame 874. The ninth sub-frame 875 is also located between the second flip-chip film 89 and the second battery back cover 85, and has a gap with the second flip-chip film 89. The ninth sub-frame 875 is connected to the second battery back cover 85 through the third adhesive 86. The tenth sub-frame 876 is disposed on the side of the ninth sub-frame 875 away from the fifth sub-main circuit board 501 and is connected to the ninth sub-frame 875. The tenth sub-frame 876 is also connected to the second battery back cover 85 through the third adhesive 86. The tenth sub-frame 876 is also connected to the second bracket 882 through the fourth adhesive 881. The second bracket 882 can also support the edge of the light-emitting side of the second main screen 103.

[0239] For example, if the thickness of the G-shaped tri-fold display 04 along the oz direction is large enough, the DDIC C can be placed in the accommodating space by cutting out the part of the eighth sub-frame 874 located between the second main screen 103 and the fifth sub-main circuit board 501, for example, cutting out about 0.2mm. This completes the protection of the DDIC C.

[0240] Since the second main screen 103 has almost no rigidity, the first mid-frame component 877 is a machinable, rigid, and very thin support component to support the second main screen 103. For example, the first mid-frame component 877 can be made of steel plate, carbon plate, or aluminum alloy. As an example, the height of the first mid-frame component 877 along the oz direction can be 0.15mm-0.25mm; for instance, the height of the first mid-frame component 877 along the oz direction can be 0.15mm, 0.18mm, 0.20mm, 0.22mm, or 0.25mm, etc.

[0241] The shape of the first middle frame component 877 can be a cuboid, cube, etc., depending on actual needs. When the first middle frame component 877 is a cuboid, the tensile strength of its first side is 600 MPa-650 MPa, the tensile strength of its second side is 650 MPa-750 MPa, the elastic modulus of its first side is 100 GPa-110 GPa, and the elastic modulus of its second side is 60 GPa-70 GPa. Specifically, the tensile strength of the first side of the first middle frame component is 620 MPa, the tensile strength of its second side is 700 MPa, the elastic modulus of its first side is 104 GPa, and the elastic modulus of its second side is 62 GPa. It should be noted that the first side of the first middle frame component is the longer side, and the second side is the shorter side; the length of the longer side is greater than the length of the shorter side.

[0242] For example, the mid-frame can be machined to 0.5mm using CNC technology. After disassembly, the first mid-frame is disassembled into part 877. For instance, a steel plate is connected to the eighth sub-mid-frame 874 using screws. The steel plate can be made very thin, such as 0.15mm, allowing the volume of the third battery 52 in the main folding screen to be larger, ensuring a larger battery capacity and enabling the G-shaped triple-folding display 04 to achieve miniaturization and thinness. However, since the steel plate has relatively small deformation and the DDIC C is highly stress-sensitive, the steel plate is placed on the side, and the DDIC C is still placed within the space enclosed by the eighth sub-mid-frame 874 and the second main screen 103. This reduces the risk of the DDIC C cracking due to stress even if the G-shaped triple-folding display 04 is subjected to external forces. It should be noted that the entire second mid-frame 87, for example, the second mid-frame 87 located at DDIC B, cannot be disassembled, otherwise the support effect of the second mid-frame 87 will be reduced.

[0243] Based on the above, such as Figure 12As shown, the fifth sub-main circuit board 501 can be made into a stepped shape, which can reduce the height of the BTB. Alternatively, the fifth sub-main circuit board 501 can be composed of a first rectangular sub-circuit board and a second matrix sub-circuit board, where the first rectangular sub-circuit board has a longer length along the ox direction and the second matrix sub-circuit board has a shorter length along the ox direction, thus forming a stepped shape through the first rectangular sub-circuit board and the second matrix sub-circuit board.

[0244] Therefore, by using a thick middle frame and thin steel plate overlapping and welding, the BTB layout in the second main screen FPC 53 and the second outer screen main circuit board 54 is realized in a stepped form. This not only makes the overall thickness of the G-shaped triple-folding display screen 04 better, but also ensures good protection for DDIC C by the thick middle frame.

[0245] The tri-fold display provided in this application fully utilizes the stacking space of the main folding screen by placing both DDIC B and DDIC C within the main folding screen. This is achieved through the reasonable coordination and staggered arrangement of the second mid-frame, third battery, and third main circuit board in the oz direction. Shorter components or no components are placed in the upper and lower spaces of the third main circuit board in the DDIC area. Narrow strips can be used to complete bottleneck wiring, minimizing the impact on the overall oz-direction space. Simultaneously, the BTB is also placed within the main folding screen, minimizing resource waste from the screen D-PHY traces running from the first sub-screen to the main folding screen. This reduces trace length (e.g., approximately 270mm) and impedance abrupt changes at multiple transitions, reducing the impact on eye diagram quality and the number of through-axis BTBs, thus saving layout area (e.g., approximately 40mm²). 2 In addition, while the overall thickness of the device continues to decrease, the layout of DDIC C is completed on the side of the third battery by disassembling the second mid-frame, maintaining the thickness and capacity of the third battery. This method adds a second external screen main circuit board, but there is no transition from the sub-folding screen to the second and third through-hinges, reducing the width of the through-hinges and the narrow wiring resources of the fourth and fifth main circuit boards in the sub-folding screen.

[0246] Example 3 (N-shaped triple-fold display screen):

[0247] Figures 13 to 16 A schematic diagram is provided showing the positions of a second display driver (DDIC B) and a third display driver (DDIC C) on an N-shaped triple-fold display screen 05. Figure 15 and Figure 16 They are Figure 14 A cross-sectional view of the N-shaped triple-folding display screen 05 obtained by cutting along cutting lines F1F2.

[0248] like Figures 13 to 16As shown, the N-shaped triple-fold display screen 05 provided in this application embodiment includes: a main folding screen and a secondary folding screen. The sub-folding screen includes a second sub-screen and a third sub-screen. The second sub-screen includes a second inner screen 104, and the third sub-screen includes a third inner screen 105. The main folding screen includes a second main screen 103, a second middle frame 87, a second display driver (DDIC B), and a third display driver (DDIC C). The second main screen 103 and the second inner screen 104 are located on both sides of the second folding edge b11 and share the second folding edge b11. The second inner screen 104 and the third inner screen 105 are located on both sides of the third folding edge b14 and share the third folding edge b14. In the folded state of the N-shaped triple-folding display screen 05, the second main screen 103 and the second inner screen 104 face each other, and the third inner screen 105 faces away from the second inner screen 104. In the unfolded state of the N-shaped triple-folding display screen 05, the second main screen 103, the second inner screen 104, and the third inner screen 105 are on the same plane. The second middle frame 87, DDIC B, and DDIC C are also included. C is located on the backlight side of the second main screen 103. There is an accommodating space between the backlight side of the second main screen 103 and part of the second middle frame 87. DDIC B and DDIC C are located in the accommodating space and are both electrically connected to the second main screen 103. DDIC B and DDIC C are separate and spaced apart. DDIC B and DDIC C are used together to control the second main screen 103, the second inner screen 104 and the third inner screen 105.

[0249] The most significant difference between the aforementioned N-shaped tri-fold display screen 05 and the G-shaped tri-fold display screen 04 is that the second sub-screen of the N-shaped tri-fold display screen 05 does not have a second outer screen. In the folded state of the N-shaped tri-fold display screen 05, the third inner screen 105 is used as the outer screen. Therefore, it is not necessary to set up a second outer screen main circuit board like the G-shaped tri-fold display screen 04. Thus, while the N-shaped tri-fold display screen 05 has some structural designs that are the same as the G-shaped tri-fold display screen 04, some structural designs are different.

[0250] Specifically, such as Figure 15 As shown, the DDIC B setting in the N-shaped triple-fold display 05 is the same as that in the G-shaped triple-fold display 04, and will not be repeated here.

[0251] The DDIC C setting in the N-shaped tri-fold display 05 differs from that in the G-shaped tri-fold display 04. The difference lies in: Figure 14 and Figure 10A comparison reveals that the main folding screen does not have a second main screen FPC 53 or a second outer screen main circuit board 54, but it does have a third main screen FPC 100 and a fourth inner screen FPC 101. The third main screen FPC 100 is electrically connected to the fifth sub-main circuit board 501 and the sixth sub-main circuit board 502, respectively, while the fourth inner screen FPC 101 is electrically connected to the seventh sub-main circuit board 601 and the eighth sub-main circuit board 602, respectively. Meanwhile, Figure 14 The third battery in the middle is 52mm in size compared to Figure 10 The third battery, 52, can be larger, but the rest of the design remains unchanged.

[0252] Therefore, please refer to the following: Figure 16 , Figure 16 and Figure 12 The difference is that the main folding screen may also include a third adhesive 95, a fourth connecting structure 813, and the second middle frame 87 includes an eleventh sub-middle frame 878 (without the first middle frame disassembly 877). The orthographic projection E5 of DDIC C on the second main screen 103 coincides with the orthographic projection E7 of the third battery 52 on the second main screen 103.

[0253] In application, the material of the third adhesive 95 may include resin and additives, which can play an adhesive role. The third adhesive 95 may include a fourth sub-adhesive 951, a fifth sub-adhesive 952, and a sixth sub-adhesive 953, etc. The specific types of the fourth sub-adhesive 951, the fifth sub-adhesive 952, and the sixth sub-adhesive 953 may be the same or different, and no specific limitation is made here. Specifically, the fourth connecting structure 813 is connected to the eighth sub-frame 874 through the fourth sub-adhesive 951. The eighth sub-frame 874 is also connected to the third battery 52 through the fifth sub-adhesive 952. The eleventh sub-frame 878 is connected to the third battery 52 through the sixth sub-adhesive 953.

[0254] The overlap of the orthographic projection E5 of DDIC C on the second main screen 103 and the orthographic projection E7 of the third battery 52 on the second main screen 103 means that: the orthographic projection E5 of DDIC C on the second main screen 103 and the orthographic projection E7 of the third battery 52 on the second main screen 103 partially overlap, or the orthographic projection E5 of DDIC C on the second main screen 103 and the orthographic projection E7 of the third battery 52 on the second main screen 103 completely overlap. Significantly, as... Figure 16 As shown, the projection E5 of DDIC C on the second main screen 103 is positioned within the projection E7 of the third battery 52 on the second main screen 103. This allows the second battery 52 to be larger in size, have a larger battery capacity, and a longer battery life.

[0255] In practical applications, the eleventh sub-frame 878 is positioned along the ox direction on the side away from the second battery 52, away from the fourth connecting structure 813 and the fourth sub-adhesive 951. One end of the eleventh sub-frame 878 is directly connected to the eighth sub-frame 874.

[0256] For example, if the thickness of the N-shaped tri-fold display 05 along the oz direction is large enough, the DDIC C can be placed in the accommodating space by cutting out the part of the eighth sub-frame 874 located between the second main screen 103 and the third battery 52, for example, cutting out about 0.2mm.

[0257] It should be noted that, Figures 14 to 16 To illustrate the positions of DDIC B and DDIC C, only some structures related to the positions of DDIC B and DDIC C are shown; other structures are not shown, but are not limited to these.

[0258] The tri-fold display provided in this application fully utilizes the stacking space of the main folding screen by placing both DDIC B and DDIC C within the main folding screen. This is achieved through the reasonable coordination and staggered arrangement of the second mid-frame, third battery, and third main circuit board in the oz direction. Shorter components or no components are placed in the upper and lower spaces of the third main circuit board in the DDIC area. Narrow strips can be used to complete bottleneck wiring, minimizing the impact on the overall oz-direction space. Simultaneously, the BTB is also placed within the main folding screen, minimizing resource waste from the screen D-PHY traces running from the first sub-screen to the main folding screen. This reduces trace length (e.g., approximately 270mm) and impedance abrupt changes at multiple transitions, reducing the impact on eye diagram quality and the number of through-axis BTBs, thus saving layout area (e.g., approximately 40mm²). 2 ).

[0259] The advantages of the foldable display screens in Examples 1 to 3 are described in detail below.

[0260] 1. Cabling resource benefits:

[0261] The BTB connector is directly attached to the main circuit board of the foldable screen, and connects directly from the main circuit board of the foldable screen to the SOC. The total trace length is approximately 40mm, and the main circuit board can save approximately 20mm² of single-layer trace space. 2 .

[0262] 2. Width of through-shaft FPC reduced:

[0263] Two sets of D-PHY single-layer cabling can reduce the width by approximately 3.6mm, freeing up space for the folding edge area, increasing the space for the hinge design, enabling a multi-main swing arm design, improving the drop performance of the corresponding area of ​​the foldable display, the flatness of the folding edge area, and the flattening angle. At the same time, each through-axis FPC can save approximately 324mm² of single-layer cabling resources. 2 The wiring does not need to connect from the secondary folding screen to the main folding screen, but is directly fastened at the main folding screen, which reduces the width of each through-axis FPC and makes reasonable use of wiring resources.

[0264] 3. Insertion loss and eye diagram benefits:

[0265] Figure 17 Curve L1 in the figure represents the insertion loss simulation curve of the DDIC placed on the main screen in this embodiment of the application. Figure 17 Curve L2 in the figure represents the insertion loss simulation curve of the DDIC placed in the sub-screen of a dual-folding display in related technologies. Figure 17 Curve L3 in the figure represents the insertion loss simulation curve of the DDIC placed on the secondary screen furthest from the main screen in a tri-fold display of a related technology.

[0266] like Figure 17 As shown, the insertion loss of curve L1 at 1.2 GHz is -2.907 dB, the insertion loss of curve L2 at 1.2 GHz is -0.711 dB, and the insertion loss of curve L3 at 1.2 GHz is -4.438 dB. The insertion loss of the entire path is increased by 3.727 dB. The increase in insertion loss will lead to the loss of high-frequency components of the signal, which will affect the degree of eye diagram opening and the signal quality will deteriorate.

[0267] Figure 18 The eye diagram simulation results are for DDIC placed on the main screen in this application embodiment. Figure 19 Eye diagram simulation results for DDIC placed on the secondary screen of a dual-folding display in related technologies. Figure 20 Eye diagram simulation results for DDIC placed on the secondary screen furthest from the main screen in a tri-fold display of a related technology.

[0268] exist Figures 18 to 20 In general, the wider the eyes are opened, the higher the eye height of the eye diagram, the wider the eye width of the eye diagram, and the thinner the eyelids of the eye diagram, the better the signal quality.

[0269] In addition, the test results are shown in Table 1.

[0270] Table 1

[0271] Figure 18 Figure 19 Figure 20 High eyesight 0.297 0.196 0.177 Wide eyes 9.45E-10 9.1E-10 8.550E-10

[0272] It should be noted that eye height is the difference between the topmost and bottommost intersection points in the eye diagram, and eye width is the difference between the rightmost and leftmost intersection points in the eye diagram.

[0273] Figures 17 to 20 As can be seen from Table 1, for eye diagram indicators such as eye height, eye width, noise, and jitter, the DDIC placed on the main screen of this application embodiment has the best eye diagram effect.

[0274] from Figures 18 to 20 The eye heights were 0.167, 0.137, and 0.13, respectively, consistent with the trend observed in the insertion loss simulation. The eye widths were 9.45E-10, 9.1E-10, and 8.55E-10, respectively, also gradually decreasing. Compared to... Figure 18 , Figure 19 and Figure 20 The eye height and eye width decreased by 22% and 10% respectively, resulting in a lower tolerance for the eye template. Furthermore, the eye diagram simulation results showed a significant increase in eye diagram jitter and noise, both of which contribute to a smaller tendency for the eye diagram to open.

[0275] This is because: the DDIC is placed on the secondary screen furthest from the main screen in a tri-fold display, and the D-PHY traces must sequentially pass through the main circuit board of the secondary screen furthest from the main screen, through the shaft, through the main circuit board of the secondary screen connected to the main screen in the tri-fold display, and through the shaft to the main circuit board of the main fold screen. This process increases insertion loss, and impedance abrupt change points at locations such as the BTB also increase simultaneously, significantly affecting eye diagram quality. However, the embodiments of this application can significantly reduce BTB impedance mismatch, thereby reducing the overall link length and significantly improving both insertion loss and eye diagram quality.

[0276] The above only introduces the content related to the inventive point. Other content can be obtained by referring to relevant technologies, and will not be explained in detail here.

[0277] It should be understood that the above description is merely to help those skilled in the art better understand the embodiments of this application, and is not intended to limit the scope of the embodiments of this application. Based on the examples given above, those skilled in the art can obviously make various equivalent modifications or changes. For example, some steps in various embodiments of the method may be optional, or new steps may be added; or any combination of two or more of the above embodiments. Such modifications, changes, or combinations also fall within the scope of the embodiments of this application.

[0278] It should also be understood that the above description of the embodiments of this application focuses on highlighting the differences between the various embodiments. Any similarities or differences not mentioned can be referred to each other. For the sake of brevity, they will not be repeated here.

[0279] It should also be understood that the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0280] It should also be understood that the methods, situations, categories, and classifications of embodiments in this application are for the convenience of description only and should not constitute a special limitation. Various methods, categories, situations, and features in embodiments can be combined without contradiction.

[0281] It should also be understood that, in the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0282] Finally, it should be noted that 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 within the technical scope 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 foldable display screen, characterized by, include: A secondary folding screen, wherein the secondary folding screen has at least one inner screen; The main folding screen and the secondary folding screen are located on opposite sides of the folding edge and share the folding edge. The main folding screen includes a main screen, a mid-frame, and at least one display driver. In the folded state of the foldable display, the main screen faces an inner screen. In the unfolded state of the foldable display, the main screen and all inner screens are on the same plane. The mid-frame and the display driver are both located on the backlight side of the main screen. There is an accommodating space between the backlight side of the main screen and a portion of the mid-frame. The display driver is located within the accommodating space and is electrically connected to the main screen. The display driver is used to control the main screen and the inner screens.

2. The foldable display screen of claim 1, wherein, One end of the second side of the main screen is connected to one end of the folded edge through the first side of the main screen, and the other end of the second side of the main screen is connected to the other end of the folded edge through the third side of the main screen. Along a first direction, the distance between the display driver and the second side of the main screen is less than the distance between the display driver and the folding edge; wherein, the first direction is the direction parallel to the main screen when the foldable display is unfolded.

3. The foldable display screen of claim 1 or 2, wherein, There is a gap between the display driver and the mid-frame.

4. The foldable display screen of any one of claims 1-3, wherein, The main folding screen also includes a first structure, which is disposed on the side of the middle frame away from the main screen, and the orthographic projection of the first structure on the main screen coincides with the orthographic projection of the display driver on the main screen. The first structure includes a main circuit board or a battery.

5. The foldable display screen of any one of claims 2-4, wherein, The main screen is a first main screen, and the secondary folding screen has a first secondary screen. The first secondary screen includes a first inner screen and a first outer screen. The first inner screen and the first outer screen face away from each other. The folding edge is a first folding edge. The first main screen and the first inner screen are located on both sides of the first folding edge and share the first folding edge. In the folded state of the foldable display screen, the first main screen and the first inner screen face each other. In the unfolded state of the foldable display screen, the first main screen and the first inner screen are on the same plane. The display driver is a first display driver, which is used to control the first main screen, the first inner screen, and the first outer screen.

6. The foldable display screen of claim 5, wherein, Along the second direction, the distance between the first display driver and the first side of the first main screen is equal to the distance between the first display driver and the third side of the first main screen; wherein, the second direction is the direction that is parallel to the main screen and perpendicular to the first direction when the foldable display screen is unfolded.

7. The foldable display screen of claim 6, wherein, The main folding screen further includes a first main circuit board and a first battery. The first main circuit board includes a first sub-main circuit board and a second sub-main circuit board, which are electrically connected. A first side of the first battery is located on the same side as a first side of the first main screen, a second side of the first battery is located on the same side as a second side of the first main screen, a third side of the first battery is located on the same side as a third side of the first main screen, and a fourth side of the first battery is located on the same side as the first folding edge. Along the second direction and the third direction, the first battery is disposed between the first sub-main circuit board and the second sub-main circuit board, and is spaced apart from both the first sub-main circuit board and the second sub-main circuit board. The third direction is perpendicular to both the first direction and the second direction. The orthographic projection of the first display driver on the first main screen coincides with the orthographic projection of the first battery on the first main screen.

8. The foldable display screen of claim 7, wherein, The first sub-screen further includes a second main circuit board, a second battery, and a first outer screen main circuit board. The second main circuit board includes a third sub-main circuit board and a fourth sub-main circuit board. The third sub-main circuit board and the fourth sub-main circuit board are electrically connected. The first side of the second battery is located on the same side as the first side of the first inner screen. The second side of the second battery is located on the same side as the second side of the first inner screen. The third side of the second battery is located on the same side as the third side of the first inner screen. The fourth side of the second battery is located on the same side as the first folding edge. Along the second direction and the third direction, the second battery is disposed between the third sub-main circuit board and the fourth sub-main circuit board, and is spaced apart from both the third sub-main circuit board and the fourth sub-main circuit board. The first external screen main circuit board is electrically connected to the third sub-main circuit board and the fourth sub-main circuit board respectively. Along the direction perpendicular to the main screen, the first external screen main circuit board overlaps with the second battery. The foldable display screen also includes a first through shaft, which is electrically connected to the first sub-main circuit board and the third sub-main circuit board respectively. Along the third direction, the first through shaft overlaps with the first folding edge.

9. The foldable display screen of any one of claims 2-4, wherein, The main screen is a second main screen, and the secondary folding screen includes a second secondary screen and a third secondary screen. The second secondary screen has at least a second inner screen, and the third secondary screen has a third inner screen. The folding edge includes a second folding edge and a third folding edge. The second main screen and the second inner screen are located on both sides of the second folding edge and share the second folding edge. The second inner screen and the third inner screen are located on both sides of the third folding edge and share the third folding edge. In the folded state of the foldable display screen, the second main screen and the second inner screen face each other. In the unfolded state of the foldable display screen, the second main screen, the second inner screen, and the third inner screen are on the same plane. The display driver includes a second display driver and a third display driver. The second display driver and the third display driver are spaced apart and separately arranged. Both the second display driver and the third display driver are disposed within the accommodating space and are electrically connected to the second main screen. The second display driver and the third display driver are used together to control the second main screen, the second inner screen and the third inner screen.

10. The foldable display screen of claim 9, wherein, The main folding screen also includes a third main circuit board and a third battery. The third main circuit board includes a fifth sub-main circuit board and a sixth sub-main circuit board, which are electrically connected. The first side of the third battery is located on the same side as the first side of the second main screen, the second side of the third battery is located on the same side as the second main screen, the third side of the third battery is located on the same side as the third side of the second main screen, and the fourth side of the third battery is located on the same side as the second folding edge. Along a second direction and a third direction, the third battery is disposed between the fifth sub-main circuit board and the sixth sub-main circuit board, and is spaced apart from both the fifth and sixth sub-main circuit boards. The second direction is parallel to the main screen and perpendicular to the first direction, and the third direction is perpendicular to both the first and second directions. The orthographic projection of the second display driver on the second main screen coincides with the orthographic projection of the fifth sub-main circuit board on the second main screen.

11. The foldable display screen of claim 10, wherein, The second secondary screen has a second inner screen and a second outer screen. The second inner screen and the second outer screen face away from each other. In the folded state of the foldable display, the second main screen and the third inner screen face each other, and the third inner screen is located between the second main screen and the second inner screen. In the unfolded state of the foldable display, the second main screen, the second inner screen and the third inner screen are on the same plane. The second display driver and the third display driver are used together to control the second main screen, the second inner screen, the second outer screen and the third inner screen. The fifth sub-main circuit board also extends to a position between the second side of the third battery and the second side of the second main screen, and the orthographic projection of the third display driver on the second main screen coincides with the orthographic projection of the portion of the fifth sub-main circuit board located between the second side of the third battery and the second side of the second main screen on the second main screen.

12. The foldable display screen of claim 11, wherein, The second sub-screen includes a fourth main circuit board and a fourth battery. The fourth main circuit board includes a seventh sub-main circuit board and an eighth sub-main circuit board. The seventh sub-main circuit board and the eighth sub-main circuit board are electrically connected. The first side of the fourth battery is located on the same side as the first side of the second inner screen. The second side of the fourth battery is located on the same side as the second folded edge. The third side of the fourth battery is located on the same side as the second inner screen. The fourth side of the fourth battery is located on the same side as the third folded edge. Along the third direction, the fourth battery is disposed between the seventh sub-main circuit board and the eighth sub-main circuit board, and is spaced apart from both the seventh sub-main circuit board and the eighth sub-main circuit board. The third sub-screen includes a fifth main circuit board and a fifth battery. The fifth main circuit board includes a ninth sub-main circuit board and a tenth sub-main circuit board. The ninth sub-main circuit board and the tenth sub-main circuit board are electrically connected. The first side of the fifth battery is on the same side as the first side of the third inner screen. The second side of the fifth battery is on the same side as the second side of the third inner screen. The third side of the fifth battery is on the same side as the third inner screen. The fourth side of the fifth battery is on the same side as the third folding edge. Along the third direction, the fifth battery is disposed between the ninth sub-main circuit board and the tenth sub-main circuit board, and is spaced apart from both the ninth sub-main circuit board and the tenth sub-main circuit board. The foldable display screen further includes a second through-axis, a third through-axis, a second main screen circuit board, a third inner screen circuit board, and a second outer screen main circuit board. The second outer screen main circuit board is electrically connected to the portion of the fifth sub-main circuit board extending between the second side of the third battery and the second side of the second main screen, and to the eighth sub-main circuit board. Along the third direction, the second outer screen main circuit board overlaps with the third battery and the second folding edge. The second through shaft is electrically connected to the fifth sub-main circuit board and the seventh sub-main circuit board respectively, and along the third direction, the second through shaft overlaps with the second folded edge; The third through shaft is electrically connected to the seventh sub-main circuit board and the ninth sub-main circuit board respectively, and along the third direction, the third through shaft overlaps with the third folded edge; The second main screen circuit board is electrically connected to the portion of the fifth sub-main circuit board that extends between the second side of the third battery and the second side of the second main screen, and to the sixth sub-main circuit board. The third inner screen circuit board is electrically connected to the ninth sub-main circuit board and the tenth sub-main circuit board, respectively.

13. The foldable display screen of claim 12, wherein, The middle frame includes a middle frame body and a middle frame component. The middle frame body is connected to the middle frame component. The thickness of the middle frame component is less than the thickness of the middle frame body. The middle frame component is disposed on the side of the third display driver away from the fifth sub-main circuit board along the first direction and located between the second main screen and the third battery along the third direction.

14. The foldable display screen of claim 13, wherein, The middle frame component has at least a first side and a second side, the first side is connected to the second side and the length of the first side is greater than the length of the second side, the tensile strength of the middle frame component along the first side is 600 MPa-650 MPa, the tensile strength of the middle frame component along the second side is 650 MPa-750 MPa, the elastic modulus of the middle frame component along the first side is 100 GPa-110 GPa, and the elastic modulus of the middle frame component along the second side is 60 GPa-70 GPa.

15. The foldable display screen of claim 13, wherein, The main body of the middle frame is any one of aluminum alloy, magnesium alloy, and titanium alloy. The mid-frame components are made of any one of steel plate, carbon plate, and aluminum alloy.

16. The foldable display screen of claim 10, wherein, The second secondary screen has a second inner screen. In the folded state of the foldable display, the second main screen and the second inner screen face each other, and the third inner screen faces away from the second inner screen. In the unfolded state of the foldable display, the second main screen, the second inner screen, and the third inner screen are on the same plane. The second display driver and the third display driver are used together to control the second main screen, the second inner screen, and the third inner screen. The orthographic projection of the third display driver on the second main screen coincides with the orthographic projection of the third battery on the second main screen.

17. The foldable display screen of claim 16, wherein, The second sub-screen includes a fourth main circuit board and a fourth battery. The fourth main circuit board includes a seventh sub-main circuit board and an eighth sub-main circuit board. The seventh sub-main circuit board and the eighth sub-main circuit board are electrically connected. The first side of the fourth battery is located on the same side as the first side of the second inner screen. The second side of the fourth battery is located on the same side as the second folded edge. The third side of the fourth battery is located on the same side as the second inner screen. The fourth side of the fourth battery is located on the same side as the third folded edge. Along the third direction, the fourth battery is disposed between the seventh sub-main circuit board and the eighth sub-main circuit board, and is spaced apart from both the seventh sub-main circuit board and the eighth sub-main circuit board. The third sub-screen includes a fifth main circuit board and a fifth battery. The fifth main circuit board includes a ninth sub-main circuit board and a tenth sub-main circuit board. The ninth sub-main circuit board and the tenth sub-main circuit board are electrically connected. The first side of the fifth battery is on the same side as the first side of the third inner screen. The second side of the fifth battery is on the same side as the second side of the third inner screen. The third side of the fifth battery is on the same side as the third inner screen. The fourth side of the fifth battery is on the same side as the third folding edge. Along the third direction, the fifth battery is disposed between the ninth sub-main circuit board and the tenth sub-main circuit board, and is spaced apart from both the ninth sub-main circuit board and the tenth sub-main circuit board. The foldable display screen further includes a second through-axis, a third through-axis, a third main screen circuit board, a third inner screen circuit board, and a fourth inner screen circuit board. The second through-axis is electrically connected to the fifth sub-main circuit board and the seventh sub-main circuit board, respectively, and along the third direction, the second through-axis overlaps with the second folding edge. The third through shaft is electrically connected to the seventh sub-main circuit board and the ninth sub-main circuit board respectively, and along the third direction, the third through shaft overlaps with the third folded edge; The third main screen circuit board is electrically connected to the fifth sub-main circuit board and the sixth sub-main circuit board respectively; The third inner screen circuit board is electrically connected to the ninth sub-main circuit board and the tenth sub-main circuit board respectively; The fourth inner screen circuit board is electrically connected to the seventh sub-main circuit board and the eighth sub-main circuit board, respectively.

18. A display module, characterized by Including the foldable display screen as described in any one of claims 1 to 17.

19. An electronic device, comprising: Includes the display module as described in claim 18.

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