Patent Description:
Display devices, such as mobile phones, tablets and iPads, are widely used in people's work and life. A display screen module for displaying images is an indispensable part of a display device. However, display screen modules in display devices provided in existing techniques are difficult to be disassembled, which affects user experiences.

<CIT> provides a system for mechanically and electrically coupling an accessory device (<NUM>) to a portable electronic device (<NUM>), which includes a first magnetic device (<NUM>, <NUM>, <NUM>, <NUM>) on the accessory device; and a second magnetic device (<NUM>, <NUM>, <NUM>, <NUM>) on the portable electronic device, an alignment of the first magnetic device and the second magnetic device configured to mechanically and electrically connect the accessory device to the portable electronic device.

The present disclosure provide a display device so as to solve the problems in existing techniques.

The display device provided by the present disclosure has at least beneficial effects as follows.

The implementations set forth in the following description of exemplary embodiments do not represent all implementations consistent with the invention. Instead, they are merely examples of apparatuses and methods consistent with aspects related to the invention as recited in the appended claims.

The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. The technical or scientific terms used in this disclosure shall have the general meanings understood by those with general skills in the field to which this disclosure belongs, unless otherwise defined. The words of "first", "second", and the like used in this disclosure and the claims do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, the words of "a" or "one", and the like do not refer to quantitative restrictions, but to mean there is at least one. Unless otherwise specified, the words of "comprise" or "comprising" and the like mean that the components or objects appearing before the words "comprise" or "comprising" cover the components or objects appearing after the words "comprise" or "comprising" and their equivalents, and other components or objects are not excluded. And the words of "connected" or "connecting" and the like are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

The singular forms such as "a", "the" and "this" used in the description and the appended claims are also intended to include the plural forms, unless the context clearly indicates other meanings. It should be also understood that the term "and/or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

In some embodiments, the display screen module of the display device is fixedly connected with the body of the display device, in this way, during replacement of the display screen module, the connection between the display screen module and the body will be damaged, which not only increases the cost of screen replacement for the display device, but also leads to poor user experiences.

Based on the foregoing, the display device is provided by the embodiments of the present disclosure. <FIG> are schematic structural diagrams of a display device according to different exemplary embodiments. It should be noted that the figures only use a mobile phone as an example for illustration, but in the embodiments of the present disclosure, the display device includes, but is not limited to, a mobile phone, a tablet computer, a wearable device (such as a smart watch, a bracelet), an on-board device, or a medical device.

As shown in <FIG> and <FIG>, the display device <NUM> includes a body <NUM>, and a display screen module <NUM> detachably connected with the body <NUM>. The words "detachably connected" means that the display screen module <NUM> and the body <NUM> are detached and connected without damaging their structures. Wherein, <FIG> is a schematic diagram showing a connection state of the body <NUM> and the display screen module <NUM>, <FIG> is a schematic diagram showing a separation state of the body <NUM> and the display screen module <NUM>.

The body <NUM> includes a frame <NUM> and a back cover <NUM> connected with the frame <NUM>. The frame <NUM> and the back cover <NUM> enclose an open cavity for installing the battery, the controller, function modules and other components of the display device <NUM>.

The display screen module <NUM> includes a display screen <NUM>, and a glass cover <NUM> covering a display surface of the display screen <NUM>. The display screen <NUM> is selected from an LCD (Liquid Crystal Display) screen, an OLED (Organic Light-Emitting Diode) screen, or an LED (Light Emitting Diode) screen. And the display screen module <NUM> is installed on an open surface of the body <NUM> to block the cavity of the body <NUM>. The display surface of the display screen module <NUM> is disposed facing the exterior of the cavity.

In an embodiment, the detachable connection between the body <NUM> and the display screen module <NUM> is implemented by the magnetic field. Specifically, the body <NUM> further includes a first magnetic assembly <NUM> and the display screen module <NUM> further includes a second magnetic assembly <NUM>. At least one of the first magnetic assembly and the second magnetic assembly is a magnetic-field controllable assembly. The magnetic-field controllable assembly changes its own magnetic field strength and magnetic pole direction (for example, to reverse the magnetic south pole and magnetic north pole). With the magnetic-field controllable assembly, the first magnetic assembly <NUM> and the second magnetic assembly123 is connected with or separated from one another due to magnetic attraction or repulsion respectively.

According to an embodiment of the disclosure, magnetic poles of the first magnetic assembly <NUM> are arranged to be opposite to magnetic poles of the second magnetic assembly <NUM>. In this way, the attraction or repulsion effect of the first magnetic assembly <NUM> and the second magnetic assembly <NUM> is optimized.

In the embodiments of the present disclosure, <FIG> provide an implementation method of a magnetic-field controllable assembly <NUM>. As shown in <FIG> and combined with <FIG>, the magnetic-field controllable assembly <NUM> includes a ferromagnetic core <NUM> disposed around a set axis <NUM> (for example, the ferromagnetic core <NUM> has an annular structure). Moreover, the set axis <NUM> is perpendicular to the display surface of the display screen module <NUM> when the body <NUM> and the display screen module <NUM> are connected.

The magnetic-field controllable assembly <NUM> further includes a coil <NUM> wound around the ferromagnetic core <NUM>. When the body <NUM> is connected with the display screen module <NUM>, the coil <NUM> is surrounding the ferromagnetic core <NUM> with the set axis <NUM> as an axis. According to an embodiment of the disclosure, the coil <NUM> may be annularly attached to the ferromagnetic core <NUM>.

For example, as shown in <FIG>, the coil <NUM> is disposed above and below the ferromagnetic core <NUM>.

For example, as shown in <FIG>, the coil <NUM> is disposed on the inner and outer peripheral sides of the ferromagnetic core <NUM>.

Of course, the coil <NUM> may also be disposed in other ways, as long as it can ensure that the magnetic field excited by the coil <NUM> under the action of the current can realize the interaction between the first magnetic assembly <NUM> and the second magnetic assembly <NUM>.

The magnetic-field controllable assembly <NUM> further includes a charging module <NUM> electrically connected with the coil <NUM>. The charging module <NUM> provides the coil <NUM> with a first current I1 or a second current I2, wherein current directions of the first current I1 and the second current I2 are opposite.

As shown in <FIG>, the coil <NUM> excites the first magnetic field, when the charging module <NUM> outputs the first current I1 to the coil <NUM>. And the ferromagnetic core <NUM> is magnetic when magnetized by the first magnetic field, and the magnetic pole distribution is the same as that of the first magnetic field. Taking the orientation shown in <FIG> as an example, the north (N) pole of the ferromagnetic core <NUM> is on the top and the south (S) pole of the ferromagnetic core is on the bottom. In combination with the orientation shown in <FIG>, since the axial direction of the ferromagnetic core <NUM> and the coil <NUM> coincides with the separation direction of the display screen module <NUM> and the body <NUM>, the N pole of the ferromagnetic core <NUM> is at the display screen module <NUM> side, and the S pole is at the body <NUM> side.

As shown in <FIG>, the coil <NUM> excites the second magnetic field, when the charging module <NUM> outputs the second current I2 for the coil <NUM>. And the ferromagnetic core <NUM> is magnetic when magnetized by the second magnetic field, and the magnetic pole distribution is the same as that of the second magnetic field. However, the current directions of the first current I1 and the second current I2 are opposite, thus the magnetic pole distributions of the first magnetic field and the second magnetic field are also opposite. Taking the orientation shown in <FIG> as an example, herein, the N pole of the ferromagnetic core <NUM> is on the bottom and the S pole of the ferromagnetic core is on the top. In combination with the orientation shown in <FIG>, the S pole of the ferromagnetic core <NUM> is at the display screen module <NUM> side, and the N pole is at the body <NUM> side.

The first current I1 or the second current I2 is provided to the coil <NUM> through the charging module <NUM> to change the magnetic pole distribution of the magnetic-field controllable assembly <NUM>. In this way, the connection and separation between the first magnetic assembly <NUM> and the second magnetic assembly <NUM> are realized by using the principle of opposite pole attraction and like pole repulsion. Further, the detachable connection between the body <NUM> and the display screen module <NUM> is also implemented by this way. Furthermore, the way to realize the connection and separation through the action of a magnetic field, ensures the structural integrity of the body <NUM> and the display screen module <NUM>, prevents damage during the disassembly and installation process, and optimizes user experiences.

Referring to <FIG>, a controller <NUM> electrically connected with the charging module <NUM> is also provided in the body <NUM>. The controller <NUM> can control the charging module to output the first current I1 or the second current I2, in response to an operation triggering separation or triggering connection between the display screen module <NUM> and the body <NUM>.

In the embodiments of the present disclosure, there is no specific limitation on the way for acquisition of the operation triggering separation or triggering connection between the display screen module <NUM> and the body <NUM>, herein the acquisition way includes, but is not limited to: acquisition by a triggering key (physical key or virtual key), acquisition by recognition of a voice command, acquisition by monitoring preset motion parameters (such as rotation angle, moving speed in specified direction, etc.).

With regard to the implementation of the first magnetic assembly <NUM> and the second magnetic assembly <NUM>, according to an embodiment, both of the first magnetic assembly <NUM> and the second magnetic assembly <NUM> are the magnetic-field controllable assembly <NUM>. According to an embodiment, one of the first magnetic assembly <NUM> and the second magnetic assembly <NUM> is the magnetic-field controllable assembly <NUM>, and another one is a permanent magnet.

In the embodiments of the present disclosure, the first magnetic assembly <NUM> is the magnetic-field controllable assembly <NUM>, and the second magnetic assembly <NUM> is a permanent magnet. In this way, on the premise of realizing the detachable connection between the body <NUM> and the display screen module <NUM>, the production difficulty and cost of the overall display device <NUM> are reduced due to the characteristics of simple structure and easy installation of the permanent magnet. Particularly, the use of permanent magnet reduces the structural complexity of the display screen module <NUM>, such that the display screen module <NUM> is easy to package and thus the appearance of the display screen module <NUM> is beautified.

As shown in <FIG>, the first magnetic assembly <NUM> is disposed on the inner wall of the frame <NUM> of the body <NUM>. The first magnetic assembly <NUM> is the magnetic-field controllable assembly <NUM>. Herein, the ferromagnetic core <NUM> and the coil <NUM> are disposed along an inner wall of the frame <NUM>. For example, the ferromagnetic core <NUM> and the coil <NUM> are attached to the inner wall of the frame <NUM>. Moreover, the charging module <NUM> of the first magnetic assembly <NUM> is disposed within the body <NUM>, and connected with the coil <NUM> through pins or flexible circuit board(s).

As shown in <FIG> and combined with <FIG>, the second magnetic assembly <NUM> is disposed on one side of the display screen module <NUM> facing the body <NUM>.

According to an embodiment of the disclosure, as shown in <FIG>, the cover <NUM> of the display screen module <NUM> is disposed beyond the edge of the display screen <NUM>. The second magnetic assembly <NUM> and the display screen <NUM> are located on the same side of the cover <NUM>, and the second magnetic assembly <NUM> is disposed on a portion of the cover <NUM> beyond the display screen <NUM>.

According to an embodiment of the disclosure, the second magnetic assembly <NUM> is disposed on a back side of the display screen <NUM>. The back side of the display screen <NUM> is a side opposite to the display surface of the display screen <NUM> (this scheme is not shown in <FIG>).

The second magnetic assembly <NUM> is a permanent magnet and disposed around the set axis <NUM>. The set axis <NUM> is parallel with the separation direction of the display screen module <NUM> and the body <NUM>.

Exemplarily, the second magnetic assembly <NUM> is an annular permanent magnet attached to the display screen module <NUM> (for example, as shown in <FIG>), and the axis of the annular permanent magnet is parallel with the set axis <NUM>. For example, the second magnetic assembly <NUM> includes multiple permanent magnets (not shown in <FIG>). The multiple permanent magnets are attached to the display screen module <NUM> in an annular manner, and the axis of the annulus formed by the multiple permanent magnets is parallel to the set axis <NUM>.

In an embodiment, the ferromagnetic core <NUM> of the first magnetic assembly <NUM> is arranged to be opposite to the permanent magnet of the second magnetic assembly <NUM>. In this way, the first magnetic assembly <NUM> is closely connected with the second magnetic assembly <NUM>, when the body <NUM> is connected with the display screen module <NUM>.

Further, as shown in <FIG> and <FIG>, an elastomeric seal <NUM> is provided within the body <NUM>. The elastomeric seal <NUM> is disposed between attracted connection surfaces of the first magnetic assembly <NUM> and the second magnetic assembly <NUM> when the body <NUM> and the display screen module <NUM> are connected. Wherein, the elastomeric seal <NUM> is an elastomeric sealing ring or an elastomeric sealing strip. According to an embodiment of the disclosure, the elastomeric seal <NUM> is made from foam, silicone, and other materials. The structural tightness of the body <NUM> and the display screen module <NUM> is improved by the elastomeric seal <NUM> to ensure the use security of the display device <NUM>.

And, According to an embodiment of the disclosure, as shown in <FIG>, the elastomeric seal <NUM> is disposed within the body <NUM> and covers one side of the first magnetic assembly <NUM> facing the display screen module <NUM> (for example, the first magnetic assembly <NUM> has an annular structure, and the elastomeric seal <NUM> covers an annular surface of the first magnetic assembly <NUM> facing the display screen module <NUM>). According to an embodiment of the disclosure, as shown in <FIG>, the elastomeric seal <NUM> is disposed on the display screen module <NUM>, and covers the permanent magnet of the second magnetic assembly <NUM>.

In an embodiment, a motion sensor is provided within the body <NUM>, which is configured to detect a motion parameter of the display device <NUM> along a vertical direction. For example, the motion sensor is configured to detect the velocity and/or acceleration of the display device <NUM> along a vertical direction. Moreover, the controller <NUM> is electrically connected with the motion sensor, and in response to that the motion parameter along the vertical direction, which is detected by the motion sensor, rises to a preset threshold, the controller is configured to control the charging module <NUM> to reduce an intensity of an output current.

When the motion parameter along the vertical direction, which is detected by the motion sensor, rises to a preset threshold (for example, the velocity and/or acceleration of the display device <NUM> rises to a preset threshold), it indicates that the display device <NUM> is in a falling state.

In addition, the magnetic field strength of the magnetic-field controllable assembly <NUM> is positively related to the strength of the current in the coil <NUM>. Therefore, controlling the charging module <NUM> to reduce the strength of the output current can weaken the magnetism of the magnetic-field controllable assembly <NUM>, which thus reduces the combination tightness of the first magnetic assembly <NUM> and the second magnetic assembly <NUM>. It should be noted that the reduced current output by the charging module <NUM> satisfies the requirement that the magnetic field excited by the coil can still maintain the connection between the body <NUM> and the display screen module <NUM>, then the structural security of the display device <NUM> can be ensured.

In this case, when the display device <NUM> falls, the controller <NUM> controls the charging module <NUM> to reduce the strength of the output current, such that deformation of the elastomeric seal <NUM>, which is resulted from the press by the first magnetic assembly <NUM> and the second magnetic assembly <NUM>, reduces. Further, when the display device <NUM> decelerates or touches the ground, the elastomeric seal <NUM> can be further compressed to play a buffering role and realize the anti-falling effect, which can ensure the structural integrity of the display screen module <NUM>.

In an embodiment, as shown in <FIG>, the display device <NUM> further includes a movable connecting arm <NUM>, wherein one end of the movable connecting arm <NUM> is disposed within the body <NUM>, and the other end of the movable connecting arm <NUM> is connected with the display screen module <NUM>. The movable connecting arm <NUM> is telescopic relative to the body <NUM>, for example, the movable connection arm <NUM> is a telescopic movable connection arm.

The controller <NUM> of the display device <NUM> is electrically connected with the movable connecting arm <NUM>, and the controller <NUM> is configured to control the movable connecting arm <NUM> to drive the display screen module <NUM> to eject from the body <NUM>, in response to an operation triggering separation between the display screen module <NUM> and the body <NUM>. As a preferred solution, the controller <NUM> preferentially controls the charging module <NUM> of the magnetic-field controllable assembly <NUM>, and then actuates the movable connecting arm <NUM>, after the first magnetic assembly <NUM> mutually magnetically repels with the second magnetic assembly <NUM>.

The controller <NUM> can control the movable connecting arm <NUM> to drive the display screen module <NUM> to retract to the body <NUM>, in response to the operation triggering connection between the display screen module <NUM> and the body <NUM>. As a preferred solution, the controller <NUM> preferentially controls the charging module <NUM> of the magnetic-field controllable assembly <NUM>, and then actuates the movable connecting arm <NUM>, after the first magnetic assembly <NUM> mutually magnetically attracts with the second magnetic assembly <NUM>.

According to an embodiment of the disclosure, the display device <NUM> is provided with a movable connecting arm <NUM>, which is connected with one side of the display screen module <NUM> facing the interior of the body <NUM>. According to an embodiment of the disclosure, the display device <NUM> is provided with at least two movable connecting arms <NUM>, and the joints of the movable connecting arms <NUM> and the display screen module <NUM> are evenly distributed on one side of the display screen module <NUM> facing the interior of the body <NUM>. In this way, it is ensured that the movable connecting arm <NUM> acts stably on the display screen module <NUM>.

In some embodiments, when the display device <NUM> is in use, it is difficult for the display device <NUM> to maintain stable due to the influence from external environment. For example, the display device <NUM> frequently shakes during use due to the influence of the vehicle speed and road conditions when the user is traveling on a train, car, or other means of transportation, which results in visual fatigue and even dizziness for the user, thus affecting user experiences.

In view of the above problems, the embodiments of the present disclosure provide the following solutions. In an embodiment, the display device <NUM> includes a motion sensor to detect a motion parameter of the body <NUM>.

The body has six degrees of freedom of motion during use. As shown in <FIG>, the six degrees of freedom of motion of the body <NUM> include the degrees of freedom of translation along the positive and negative directions of the x-axis, y-axis, and z-axis, as well as the degrees of freedom of rotation around the x-axis, y-axis, and z-axis as axes.

Herein, according to an embodiment of the disclosure, the x-axis, y-axis, and z-axis use the display device <NUM> as a reference body, the plane formed by the x-axis and the y-axis is the surface on which the display surface of the display screen module <NUM> locates, and the z-axis is perpendicular to the display surface of the display screen module <NUM>. According to an embodiment of the disclosure, the x-axis, y-axis, and z-axis use the ground as a reference body, the plane formed by the x-axis and the y-axis is the horizontal plane, and the z-axis is distributed in the vertical direction. In this case, the body <NUM> can move freely in space under external forces.

According to an embodiment of the disclosure, the motion sensor is configured to detect the motion parameter of the body <NUM> in each of six degrees of freedom of motion. The motion parameters include, but are not limited to, the velocity, acceleration, or rotation angle of the body <NUM>.

In the display device <NUM>, the controller is electrically connected with the charging module, and when the display screen module <NUM> is magnetically separated from the body <NUM> due to magnetic repulsion, the controller <NUM> receives the motion parameters detected by the motion sensor. In addition, the controller <NUM> determines the current motion state of the body <NUM> according to the motion parameters of the body <NUM> received by the motion sensor. For example, when the motion amplitude and a motion frequency of the body <NUM> are within respective preset threshold ranges, the controller <NUM> determines that the body <NUM> is currently in a shaking state.

Moreover, in the embodiments of the present disclosure, with the end of the movable connecting arm connected with the display screen module as a reference, the end of the movable connecting arm disposed within the body has six degrees of freedom of motion. In this case, when the controller <NUM> determines that the motion amplitude and motion frequency of the body <NUM> are within respective preset threshold ranges, the controller <NUM> controls, according to the motion parameters of the body <NUM> that are obtained by the motion sensor, the movable connecting arm <NUM> to drive the display screen module <NUM> to move backwards relative to the body <NUM>.

In this way, the display screen module <NUM> is always located in a preset region. And in this preset region, the display screen module <NUM> remains stable relative to the user.

As a preferred solution, the maximum shaking amplitude of the display screen module <NUM> within the preset region is less than or equal to <NUM>. Accordingly, the movable connecting arm <NUM> is used to prevent the display screen module <NUM> from being affected by the movement of the body <NUM>. In this case, when the display device <NUM> is used, the display screen module <NUM> is always in a relatively stable state for the user. Its vibration amplitude is very small or even hard to detect by the human eye, which optimizes the user experience and plays an anti-shaking effect.

In addition, the display screen module <NUM> is provided with an independent power supply assembly, and the display screen module <NUM> is communicatively connected with the controller <NUM> within the body <NUM>. Accordingly, the display screen module <NUM> receives power from the independent power supply assembly after the display screen module <NUM> is separated from the body <NUM>, and the display screen module <NUM> receives a display instruction sent by the controller <NUM>. In this way, an image can still be displayed, after the display screen module <NUM> is separated from the body <NUM>.

Herein, the movable connecting arm <NUM> may optionally adopt an anti-shaking head mechanism. It should also be noted that, in this embodiment, the display device <NUM> preferably uses only one movable connecting arm <NUM> to maintain the stability of the display screen module <NUM> in six degrees of freedom of motion.

In an embodiment, as shown in <FIG>, the display screen module further includes a data transmission module <NUM> and a first power module <NUM>.

Herein, the data transmission module <NUM> is communicatively connected with the controller <NUM> within the body <NUM>. For example, the data transmission module <NUM> is wirelessly connected to the communication module in the controller <NUM>, where the method for wireless connection includes, but is not limited to, Bluetooth, WIFI (Wireless Fidelity, wireless local area network based on IEEE <NUM>. 11b), and ZigBee wireless transmission technology. Moreover, the data transmission module <NUM> and the display screen module <NUM> adopt a data connection, for example, the data transmission module <NUM> is connected to the control chip of the display screen module <NUM> through a cable or a flexible circuit board.

The first power module <NUM> is connected with the display screen module <NUM> and the data transmission module <NUM>, so as to supply power to the display screen module <NUM> and the data transmission module <NUM>.

In this case, when the display screen module <NUM> is separated from the body <NUM>, the display information sent by the controller <NUM> is sent to the control chip of the display screen module <NUM> through the data transmission module <NUM>, the display screen module <NUM> can thus display a preset image corresponding to the display information. In this way, the display screen module <NUM> can be used normally, even separated from the body <NUM>. With the display device <NUM>, the independent use of the display screen module <NUM> can be realized. Furthermore, compared with the whole display device <NUM>, the display screen module <NUM> is thinner and narrower, so that its user will have excellent grip feel and optimized user experiences.

Further, the body <NUM> also includes a second power module <NUM> module that mates with the first power module <NUM> to charge the first power module <NUM>.

Exemplarily, the first power module <NUM> and the second power module <NUM> are connected through contacts. When the display screen module <NUM> is connected with the body <NUM>, the contacts of the first power module <NUM> and the contacts of the second power module <NUM> abuts against each other to implement charging.

Exemplarily, the first power module <NUM> and the second power module <NUM> are wirelessly charged. For instance, the first power module <NUM> includes a first charging coil, and the second power module <NUM> includes a second charging coil. When the display screen module <NUM> is aligned with the open surface of the cavity of the body <NUM> and the distance between the display screen module <NUM> and the body <NUM> does not exceed a preset threshold, the first charging coil mates with the second charging coil to implement charging.

In addition, according to an embodiment of the disclosure, the battery capacity information is shown on the display surface of the display screen module <NUM>. When the display screen module <NUM> is separated from the body <NUM> and the battery capacity of the first power module <NUM> is lower than a preset threshold, the display screen module <NUM> displays a connection prompt.

The display device <NUM> provided by the embodiments of the present disclosure has a detachable body <NUM> and a display screen module <NUM>, which are convenient for disassembly and maintenance, and for replacement of components. Furthermore, based on the characteristics of detachable connection between the body <NUM> and the display screen module <NUM>, the anti-shaking effect is achieved by the movable connecting arm <NUM>; and the independent use of the display screen module <NUM> can be achieved with the configuration of the data transmission module <NUM>, the first power module <NUM> and the second power module <NUM>, thereby optimizing user experiences.

Claim 1:
A display device (<NUM>), comprising: a body (<NUM>), and a display screen module (<NUM>) detachably connected with the body (<NUM>),
wherein the body (<NUM>) comprises a first magnetic assembly (<NUM>); and
the display screen module (<NUM>) comprises a second magnetic assembly (<NUM>),
at least one of the first magnetic assembly (<NUM>) and the second magnetic assembly (<NUM>) is a magnetic-field controllable assembly (<NUM>), the magnetic-field controllable assembly (<NUM>) is capable of changing its own magnetic field strength and magnetic pole direction, such that the first magnetic assembly (<NUM>) and the second magnetic assembly (<NUM>) are connected with one another due to magnetic attraction, and the first magnetic assembly (<NUM>) and the second magnetic assembly (<NUM>) are separated from one another due to magnetic repulsion;
wherein the magnetic-field controllable assembly (<NUM>) comprises a coil (<NUM>) and a charging module (<NUM>) electrically connected with the coil (<NUM>), the charging module (<NUM>) is configured to provide the coil (<NUM>) with a current, and a magnetic field strength of the magnetic-field controllable assembly (<NUM>) is positively related to a strength of the current in the coil (<NUM>);
a controller (<NUM>) is provided within the body (<NUM>), the controller (<NUM>) being electrically connected with the charging module (<NUM>);
characterized in that, an elastomeric seal (<NUM>) is provided within the body (<NUM>), the elastomeric seal (<NUM>) being located between attracted connection surfaces of the first magnetic assembly (<NUM>) and the second magnetic assembly (<NUM>) when the body (<NUM>) and the display screen module (<NUM>) are connected; and
wherein when the display device (<NUM>) falls, the controller (<NUM>) controls the charging module (<NUM>) to reduce strength of an output current, such that deformation of the elastomeric seal (<NUM>), which is resulted from press by the first magnetic assembly (<NUM>) and the second magnetic assembly (<NUM>), reduces, and when the display device (<NUM>) decelerates or touches ground, the elastomeric seal (<NUM>) is further compressed.