CN110360921B

CN110360921B - Folding screen assembly, electronic equipment and folding screen angle detection method

Info

Publication number: CN110360921B
Application number: CN201910651237.9A
Authority: CN
Inventors: 张秀生
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-07-18
Filing date: 2019-07-18
Publication date: 2021-03-19
Anticipated expiration: 2039-07-18
Also published as: CN110360921A

Abstract

The application provides a folding screen assembly which comprises a flexible screen, a rear cover and a connecting piece, wherein the flexible screen, the rear cover and the connecting piece are arranged in an enclosing mode to form a cavity, and the cavity has a magnetic field shielding function; a sensor and a magnetic part are arranged in the cavity, and the sensor and the magnetic part move relatively when the flexible screen is folded, so that the sensor detects a continuously changing magnetic field. The application provides a folding screen subassembly is through setting up sensor and the magnetic part that can carry out relative motion in the cavity that has the magnetic field shielding function, and then makes the sensor can detect continuous variation's magnetic field, realizes flexible screen folding angle continuity detection achievement, has saved the detection space when improving detectivity.

Description

Folding screen assembly, electronic equipment and folding screen angle detection method

Technical Field

The application relates to the technical field of folding screens, in particular to a folding screen assembly, electronic equipment and a folding screen angle detection method.

Background

With the development of mobile terminals, more and more mobile phones gradually appear, and for a mobile phone with a folding screen, a user can adjust the size of a display screen according to requirements, so that the folding screen becomes a popular new mobile terminal form. For a folding screen mobile phone, rotation is generally realized through a rotating shaft, the rotating shaft mainly has two main modes of mechanical clamping (manual) and motor driving (automatic), and in any rotating mode, human-computer interaction and function expansion are realized through rotating action, and the rotating angle can be accurately detected, so that the real-time position of the rotating shaft is obtained.

Disclosure of Invention

The technical problem to be solved by the application is to provide a folding screen assembly, an electronic device and a folding screen angle detection method, so as to solve the problem that the angle detection of a folding screen is limited by a detection space position.

The embodiment of the application provides a folding screen assembly, which comprises a flexible screen, wherein the flexible screen is folded along a folding line; a rear cover foldable with the flexible screen; the connecting piece is connected with the flexible screen and the rear cover, the flexible screen, the rear cover and the connecting piece are arranged together in an enclosing mode to form a cavity, and the cavity has a magnetic field shielding function; a sensor and a magnetic part are arranged in the cavity, and the sensor and the magnetic part move relatively when the flexible screen is folded, so that the sensor detects a continuously changing magnetic field.

The embodiment of the application also provides electronic equipment, which comprises a processor and the folding screen assembly, wherein the processor is electrically connected with the sensor.

The embodiment of the application also provides a method for detecting the angle of the folding screen, which is applied to the electronic equipment and comprises the steps that a sensor detects the intensity of magnetic field and outputs an electric signal; the processor receives the electric signal and converts the electric signal into the folding angle of the flexible screen.

According to the folding screen assembly, the electronic equipment and the folding screen angle detection method, the sensor and the magnetic piece which can move relatively are arranged in the cavity with the magnetic field shielding function, and then the sensor can detect a continuously changing magnetic field. In addition, the magnetic part and the sensor can move along with the first flexible screen and the second flexible screen respectively, so that the sensor can establish one-to-one correspondence between the continuously-changed magnetic field and the continuous folding angles of the first flexible screen and the second flexible screen during folding. Under the condition of occupying a small space, the detection work of the continuity of the folding angle of the flexible screen is realized, and the detection space is saved while the detection sensitivity is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a folding screen assembly according to an embodiment of the present application;

FIG. 2 is a schematic structural view of a cavity of a folding screen assembly according to an embodiment of the present application;

FIG. 3 is a schematic view of a flexible screen of a folding screen assembly according to an embodiment of the present application;

FIG. 4 is a schematic view of the magnetic member of the foldable screen assembly according to an embodiment of the present application;

FIG. 5 is a schematic view of the magnetic member of the foldable screen assembly according to an embodiment of the present application;

FIG. 6 is a schematic view of the positioning structure of the magnetic member of the folding screen assembly according to an embodiment of the present application;

FIG. 7 is a schematic view of a magnetic member of a folding screen assembly according to an embodiment of the present application;

FIG. 8 is a schematic view of a magnetic member of a folding screen assembly according to an embodiment of the present application;

FIG. 9 is a schematic view of a magnetic member of a folding screen assembly according to an embodiment of the present application;

FIG. 10 is a schematic view of the magnetic member of the folding screen assembly according to an embodiment of the present application;

FIG. 11 is a schematic structural view of a folding screen assembly according to an embodiment of the present application;

FIG. 12 is a schematic view of a hinge of a folding screen assembly according to an embodiment of the present application;

FIG. 13 is a schematic structural view of a folding screen assembly according to an embodiment of the present application;

FIG. 14 is a block diagram illustrating an electronic device according to an embodiment of the present application;

FIG. 15 is a block diagram illustrating an exemplary electronic device according to an embodiment of the present application;

FIG. 16 is a schematic flowchart illustrating a method for detecting an angle of a foldable screen according to an embodiment of the present application;

FIG. 17 is a schematic flowchart illustrating a method for detecting an angle of a foldable screen according to an embodiment of the present application;

fig. 18 is a schematic flowchart of a method for detecting an angle of a folding screen according to an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The embodiment of the application provides a folding screen assembly, which can accurately detect the folding angle of a flexible screen. The applicant finds in research that a hall sensor can be used for sensing a continuously changing magnetic field, so as to detect the real-time position of the rotating shaft when the flexible screen is folded. However, the applicant also finds that there are many problems in implementing angle detection by using the hall sensor, for example, the flexible screen mobile phone generally uses a stainless steel back cover, which causes the hall sensor to be easily shielded by the stainless steel, so that the use and placement position of the hall sensor are greatly limited. In addition, if a user uses the flexible screen mobile phone, a magnetic field environment exists nearby the user, and the Hall sensor can be disabled.

It will be appreciated that a hall sensor is a magnetic field sensor made according to the hall effect. The hall effect is one of magnetoelectric effects, the hall voltage changes with the change of the magnetic field intensity, the stronger the magnetic field, the higher the voltage, the weaker the magnetic field, and the lower the voltage. The Hall sensor belongs to a passive sensor and can work only by an external power supply, and the characteristic enables the Hall sensor to detect the running condition with lower rotating speed. Therefore, the hall sensor cannot directly detect the angle, the magnetic field strength and the folding angle need to be in one-to-one correspondence, the initial corresponding relation between the magnetic field strength and the folding angle can be written in through calibration operation in the production process of a common mobile phone, and a subsequent user can directly call the parameter in the use process.

An embodiment of the present application provides a foldable screen assembly 100, where the foldable screen assembly 100 is applied to an electronic device, and the electronic device may be a mobile phone, a tablet computer, an MP3, an MP4, or other electronic devices. Specifically, referring to fig. 1, the folding screen assembly 100 includes a flexible screen 10, a rear cover 20, and a connecting member 30. The flexible screen 10 is folded along a fold line, which is not a solid component of the folded screen assembly 100, but is a dashed line of the flexible screen 10 when folded. The rear cover 20 is of a flexible structure such that the rear cover 20 can be folded with the flexible screen 10. The connector 30 connects the flexible screen 10 and the rear cover 20 so that the foldable screen assembly 100 can form a relatively stable structure when folded, and the flexible screen 10 is prevented from causing unstable influence on the structure of the electronic device associated therewith when folded.

It is noted that the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Further, the connecting member 30 connects the flexible screen 10 and the rear cover 20, so that the flexible screen 10, the rear cover 20 and the connecting member 30 together enclose a cavity 31. Obviously, the cavity 31 may be a sealed structure, so that the cavity 31 has a magnetic field shielding function, and can shield the interference of an external magnetic field to the internal structure of the cavity 31. Specifically, the cavity 31 may be formed by enclosing a metal material, that is, the rear cover 20 and the connecting member 30 are both made of a metal material, and in the embodiment of the present application, the rear cover 20 and the connecting member 30 may preferably be made of a stainless steel material. In other embodiments of the present application, in order to make the cavity 31 have a magnetic shielding function, a layer of closed space structure made of a metal material may be attached to the inner side of the cavity 31, and in this case, the materials of the rear cover 20 and the connecting member 30 may not be limited.

Further, referring to fig. 2, a sensor 311 and a magnetic member 312 are disposed in the cavity 31, and the sensor 311 and the magnetic member 312 perform relative movement when the flexible screen 10 is folded, so that the sensor 311 detects a magnetic field with a change in relation. Specifically, the sensor 311 may be a hall sensor, and when the sensor 311 and the magnetic member 312 perform a relative motion, the magnetic member 312 is rotated to change a magnetic field relative to the position of the sensor 311, so that the sensor 311 may detect different magnetic fields. Further, in order to enable the sensor 311 to detect different and continuously changing magnetic fields, the magnetic member 312 is rotated to change the magnetic field, which makes the magnetic field formed by the magnetic member 312 not symmetrical, i.e. the magnetic member 312 cannot be a circular or square magnet capable of generating the magnetic field.

It should be noted that in some other embodiments of the present application, the sensor may be an angular displacement sensor, a rotational displacement sensor, a hall sensor, or the like, which can detect displacement or magnetic field strength change, and in the embodiments of the present application, a hall sensor which can detect magnetic field strength change is preferably used.

It should be noted that the terms "first", "second", and the like in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of the feature.

In some embodiments of the present application, the flexible screen 10 is divided into a first flexible screen and a second flexible screen along a folding line, and the first flexible screen and the second flexible screen are folded to form an angle ranging from 0 to 180 ° so that a user has a better experience when using an electronic device associated with the folding screen assembly 100.

Specifically, referring to fig. 3, the flexible screen 10 includes a first flexible screen 101 and a second flexible screen 102, the first flexible screen 101 and the second flexible screen 102 are folded along a folding line, and the first flexible screen 101 and the second flexible screen 102 are folded to form a folding angle, obviously, the folding angle has a certain range, in this embodiment, the folding angle is in the range of 0 to 180 °, and the folding angle formed by folding the first flexible screen 101 and the second flexible screen 102 may be 0 °, 90 °, 180 °, and the like.

Further, please refer to fig. 4-6, which are schematic structural diagrams of the magnetic element 312 when the folding angle is 0 °, 90 °, and 180 °, respectively. When the folding angle is 0 °, referring to fig. 4, the magnetic member 312 may be at a starting position of rotation, and the magnetic field intensity detected by the sensor 311 may be a maximum value. When the folding angle is 90 °, referring to fig. 5, the magnetic element 312 may be in a middle position of rotation, and the magnetic field intensity detected by the sensor 311 may be a middle value. When the folding angle is 180 °, referring to fig. 6, the magnetic member 312 may be at the end position of the rotation, and the magnetic field intensity detected by the sensor 311 may be the minimum value. It will be appreciated that when the fold angle is 0 °, the magnetic field strength detected by the sensor 311 may not be a maximum value, such as a minimum value or other values. Accordingly, when the folding angle is 180 °, the magnetic field strength detected by the sensor 311 may not be a minimum value, such as a maximum value or other values. That is, when the folding angle is changed in the range of 0 to 180 °, the magnetic field intensity detected by the sensor 311 is continuously changed, and there is no mandatory correlation between whether the magnetic field intensity detected by the sensor 311 is the maximum value or the minimum value and whether the magnetic member 312 is at the start position or the end position of the rotation.

Further, the magnetic member 312 may move with the first flexible screen 101, and the sensor 311 may move with the second flexible screen, so that the magnetic member 312 and the sensor 311 perform relative movement when the first flexible screen 101 and the second flexible screen 102 are folded. Further, during the relative movement between the magnetic member 312 and the sensor 311, the sensor 311 may detect a continuously changing magnetic field strength, and may establish a one-to-one correspondence relationship with the continuous folding angles of the first flexible screen 101 and the second flexible screen 102 when folded.

In some embodiments of the present application, in order to enable the sensor 311 to detect different and continuously changing magnetic fields, the magnetic member 312 changes the magnetic fields by rotating, which makes the magnetic field formed by the magnetic member 312 not symmetrical, i.e. the magnetic member 312 cannot be a circle, a square, or the like, which can generate a magnet for the magnetic field. Further, the magnetic member 312 is a magnet capable of generating an asymmetric magnetic field, so that when the folding angle of the first flexible screen 101 and the second flexible screen 102 is continuously changed from 0 ° to 180 ° during folding, the magnetic field intensity detected by the sensor 311 is continuous and non-repetitive.

Specifically, referring to fig. 7-10, the magnetic element 312 may be one of a U-shaped magnet, a V-shaped magnet, an arc-shaped magnet, a C-shaped magnet, and an L-shaped magnet. When the magnetic member 312 is a U-shaped magnet, referring to fig. 7, the magnetic field of the U-shaped magnet is strongest at two poles, and the magnetic field of the U-shaped magnet is outwardly divergent, that is, the magnetic field intensity detected by the sensor 311 is strongest when the U-shaped opening of the U-shaped magnet faces the sensor 311. When the magnetic member is a V-shaped magnet, referring to fig. 8, the magnetic field of the V-shaped magnet is strongest at the two poles, and the magnetic field of the U-shaped magnet is outwardly divergent, that is, the magnetic field intensity detected by the sensor 311 is strongest when the V-shaped opening of the V-shaped magnet faces the sensor 311. When the magnetic member is an arc magnet or a C-shaped magnet, referring to fig. 9, the magnetic field of the arc magnet or the C-shaped magnet is strongest at the two poles, and the magnetic field of the arc magnet or the C-shaped magnet is outwardly divergent, that is, when the arc opening or the C-shaped opening of the arc magnet or the C-shaped magnet faces the sensor 311, the magnetic field intensity detected by the sensor 311 is strongest. When the magnetic member is an L-shaped magnet, referring to fig. 10, the magnetic field of the L-shaped magnet is strongest at the two poles, and the magnetic field of the L-shaped magnet is outwardly divergent, that is, when the L-shaped opening of the L-shaped magnet faces the sensor 311, the magnetic field intensity detected by the sensor 311 is strongest.

Further, the magnetic member 312 capable of generating an asymmetric magnetic field has an opening, the magnetic field intensity detected by the sensor 311 is the strongest when the opening is opposite to the sensor 311, at this time, the magnetic field intensity detected by the sensor 311 is gradually weakened when the magnetic member 312 is gradually rotated, and the magnetic field intensity detected by the sensor 311 is the weakest when the opening of the magnetic member 312 is far from the sensor 311. Thus, the sensor 311 can detect a continuously varying magnetic field as the magnetic member 312 rotates within a continuous angular range.

This application embodiment can carry out relative motion's sensor and magnetic part through setting up in the cavity that has the shielding function, and then makes the sensor detect continuous change's magnetic field. In addition, the magnetic part and the sensor can move along with the first flexible screen and the second flexible screen respectively, so that the sensor detects a continuously changing magnetic field, and the continuously changing magnetic field can establish a one-to-one correspondence relationship with the continuous folding angles of the first flexible screen and the second flexible screen during folding. Under the condition of occupying a small space, the continuity detection work of the folding angle of the flexible screen is realized. The problem that the folding angle of the flexible screen is easily interfered by an external magnetic field in detection is avoided, and the detection space is saved while the detection sensitivity is improved.

In some embodiments of the application, a rotating shaft is arranged in the cavity, the axis of the rotating shaft is overlapped with the folding lines of the first flexible screen and the second flexible screen, and the magnetic part is fixedly arranged on the rotating shaft, so that the magnetic part can rotate along with the rotating shaft when the rotating shaft rotates. Specifically, referring to fig. 11, the rotating shaft 313 is disposed in the cavity 31, and the rotating shaft axis 3131 coincides with the folding lines of the first flexible screen 101 and the second flexible screen 102, it can be understood that the rotating shaft axis 3131 forms the folding lines of the first flexible screen 101 and the second flexible screen 102. The magnetic member 312 is fixedly disposed on the rotating shaft 313, so that the magnetic member 312 can rotate along with the rotating shaft when the rotating shaft 313 rotates, it can be understood that the magnetic member 312 may be disposed at an end portion of the rotating shaft 313, may also be disposed at a middle portion of the rotating shaft 313, and may also be disposed on an arc-shaped surface of the rotating shaft 313, and the magnetic member 312 is disposed at an end portion of the rotating shaft 313 according to the embodiment of the present application. Further, the sensor 311 is disposed inside the cavity 31 at a position corresponding to the magnetic member 312, so that the sensor 311 can detect a continuously varying magnetic field when the rotating shaft 313 rotates.

Further, the rotating shaft 313 includes a rotating portion and a fixing portion, and the fixing portion is disposed through the rotating portion; the rotating part is connected with the first flexible screen, the magnetic part is fixedly arranged on the rotating part, the fixing part is connected with the second flexible screen, and the sensor is connected with the second flexible screen. Specifically, referring to fig. 12, the rotating shaft 313 includes a rotating portion 3132 and a fixing portion 3133, the fixing portion 3133 is disposed through the rotating portion 3132, and the magnetic element 312 is fixed to the rotating portion 3132. It can be understood that the fixing portion 3133 is disposed through the rotating portion 3132, the rotating portion 3132 is disposed on a middle portion of the fixing portion 3133, or the rotating portion 3132 is disposed on an end portion of the fixing portion 3133. Furthermore, the magnetic element 312 is fixed on the rotating portion 3132, and the magnetic element 312 may be fixed on a contact surface between the rotating portion 3132 and the fixed portion 3133, or may be fixed on a surface of the rotating portion 3132 away from the fixed portion 3133.

Further, referring to fig. 13, the magnetic member 312 is fixedly disposed on the rotation portion 3132, the rotation portion 3132 is connected to the first flexible screen 101, the fixing portion 3133 is connected to the second flexible screen 102, and the sensor 311 is connected to the second flexible screen 102, so that when the first flexible screen 101 and the second flexible screen 102 are folded within a range of 0 to 180 °, the sensor 311 and the magnetic member 312 can perform a relative motion, and the sensor 311 can detect a continuously changing magnetic field.

This application embodiment sets up the magnetic part in one side tip of pivot, detects continuous variation's magnetic field through the sensor, through the one-to-one relation of magnetic field intensity and folding angle, the folding angle of obtaining first flexible screen and the flexible screen of second that can be quick. It can be understood that in the embodiment of the present application, the magnetic member and the sensor corresponding to the magnetic member are disposed at one side end of the rotating shaft to implement angle detection. In some other embodiments of the present application, the magnetic member and the sensor corresponding to the magnetic member may be disposed at both ends of the rotating shaft, and the folding angle is detected by the sensors at both ends of the rotating shaft, so as to further improve the precision of the detection of the rotating shaft angle.

An embodiment of the present application further provides an electronic device 1000, please refer to fig. 14, where the electronic device 1000 includes a foldable screen assembly 100 and a processor 200, the foldable screen assembly 100 is the foldable screen assembly 100 in the foregoing embodiments, and no further description is given in this embodiment, the processor 200 is electrically connected to the foldable screen assembly 100, and specifically, the processor 200 is electrically connected to a sensor 311 in the foldable screen assembly 100 to receive an electrical signal sent by the sensor 311 and process the electrical signal to obtain a folding angle and a folding speed of the first flexible screen 101 and the second flexible screen 102.

Specifically, the electronic device 1000 further comprises a memory 300 communicatively connected to the processor 200, an input means 400 and an output means 500. Referring to fig. 15, the processor 200, the memory 300, the input device 400 and the output device 500 may be connected by a bus or other means, in this embodiment, the processor is connected by a bus connection means to transmit and process data or signals. It is understood that the processor 200, the memory 300, the input device 400 and the output device 500 may be connected by a bus and perform data or signal transmission as is obvious to those skilled in the art, and therefore, no further description thereof will be provided in the embodiments of the present application. The input device 400 may receive input numeric or character information and generate signal inputs related to user settings and function control, and may also input and store in the memory 300 a one-to-one correspondence of magnetic field strength and folding angle. The output device 500 may include a display device such as a display screen.

The electronic device 1000 provided in the embodiment of the application receives and processes the electrical signal sent by the sensor 311 through the processor 200, and further retrieves the corresponding relationship between the magnetic field strength and the folding angle in the memory 300 to obtain the folding angle of the first flexible screen 101 and the second flexible screen 102, and meanwhile, the processor 200 may also calculate the folding speed according to the folding angle and the folding time of the first flexible screen 101 and the second flexible screen 102. The embodiment of the application can realize the real-time continuity detection work of the folding angle and the folding speed of the flexible screen under the condition of occupying a smaller cavity space, can shield the interference of an external magnetic field, not only improves the detection sensitivity, but also saves the detection space.

The embodiment of the application also provides a method for detecting the angle of the folding screen, and the method is applied to the electronic equipment in the embodiment. Further, referring to fig. 16, the method for detecting the angle of the folding screen in the embodiment of the present application includes the following steps:

s101, detecting the magnetic field intensity by a sensor and outputting an electric signal;

s102, the processor receives the electric signals and converts the electric signals into the folding angle of the flexible screen.

Specifically, in step S101, the sensor detects the magnetic field strength and outputs an electrical signal, the sensor may be a hall sensor, the hall sensor may detect the magnetic field strength at a fixed angle and convert the magnetic field signal into an electrical signal, and when the sensor detects a continuously changing magnetic field strength, the converted electrical signal will also be continuously changing.

Further, in step S102, the processor receives the electrical signal and converts the electrical signal into a folding angle of the flexible screen, and the processor converts the received electrical signal into folding angles of the first flexible screen and the second flexible screen through the signal processing module.

In some embodiments of the present application, referring to fig. 17, before the processor receives the electrical signal and converts the electrical signal into the folding angle of the flexible screen, the processor includes:

and S1021, the magnetic field intensity and the folding angle are in one-to-one correspondence and written into a processor storage system. It can be understood that the angle can not be directly detected by the Hall sensor, the magnetic field strength and the folding angle of the first flexible screen and the second flexible screen need to be linked, calibration and storage work needs to be carried out, the calibration and storage work is to correspond the magnetic field strength detected by the Hall sensor with the folding angle of the first flexible screen and the folding angle of the second flexible screen one by one, and the initial corresponding relation obtained by calibration operation is written into system storage, and a subsequent user can directly call the angle detection process.

In some embodiments of the present application, referring to fig. 18, the processor, when receiving the electrical signal and converting the electrical signal into the folding angle of the flexible screen, further includes:

and S1022, calculating the folding speed according to the folding angle and the folding time of the flexible screen. Specifically, when the processor receives the electric signal and converts the electric signal into the folding angle of the flexible screen, the processor can record the folding time for the first flexible screen and the second flexible screen to be folded to the folding angle, and then the folding speed can be calculated through the folding angle in the folding time.

The folding screen angle detection method provided by the embodiment of the application realizes real-time continuity detection work of the folding angles and the folding speeds of the first folding screen and the second folding screen.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the content of the present application and the attached drawings, or directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A folding screen assembly, comprising:

a flexible screen folded along a fold line;

a rear cover foldable with the flexible screen;

the connecting piece is connected with the flexible screen and the rear cover, the flexible screen, the rear cover and the connecting piece are arranged together in an enclosing mode to form a cavity, and the cavity has a magnetic field shielding function;

a sensor and a magnetic part are arranged in the cavity, and the sensor and the magnetic part move relatively when the flexible screen is folded; the magnetic part is provided with an opening, and when the magnetic part rotates in a continuous angle range, the opening gradually gets away from or approaches the sensor, so that the sensor can detect a continuously changing magnetic field.

2. The folded screen assembly of claim 1, wherein the flexible screen is divided into a first flexible screen and a second flexible screen along the fold line, the first flexible screen and the second flexible screen being folded to form an angle in a range of 0-180 °.

3. The folded screen assembly of claim 2, wherein the magnetic member is movable with the first flexible screen and the sensor is movable with the second flexible screen.

4. The folding screen assembly of claim 3, wherein the magnetic member is a magnet that generates an asymmetric magnetic field.

5. The folding screen assembly of claim 4, wherein the magnetic member is one of a U-shaped magnet, a V-shaped magnet, an arc-shaped magnet, a C-shaped magnet, and an L-shaped magnet.

6. The foldable screen assembly of claim 4, wherein a shaft is disposed in the cavity, an axis of the shaft overlaps the folding line, and the magnetic member is fixed to the shaft.

7. The folding screen assembly of claim 6, wherein the shaft includes a rotating portion and a fixed portion, the fixed portion being disposed through the rotating portion; the rotating part is connected with the first flexible screen, the magnetic part is fixedly arranged on the rotating part, the fixing part is connected with the second flexible screen, and the sensor is connected with the second flexible screen.

8. An electronic device comprising a processor and the foldable screen assembly of any one of claims 1-7, wherein the processor is electrically connected to the sensor.

9. A method for detecting the angle of a folding screen, which is applied to the electronic device of claim 8, is characterized by comprising the following steps:

the sensor detects the magnetic field intensity and outputs an electric signal;

the processor receives the electric signal and converts the electric signal into the folding angle of the flexible screen.

10. The method for detecting the angle of the folding screen according to claim 9, wherein the processor receives the electrical signal and converts the electrical signal into the folding angle of the flexible screen before the method comprises: and the magnetic field intensity and the folding angle are in one-to-one correspondence and written into the processor storage system.

11. The method for detecting the angle of the folding screen according to claim 9, wherein the processor receives the electrical signal and converts the electrical signal into the folding angle of the flexible screen, and further comprises: and calculating the folding speed according to the folding angle and the folding time of the flexible screen.