Patent Publication Number: US-2022217860-A1

Title: Display apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Chinese Patent Application No. 202120018212.8, filed on Jan. 5, 2021 and entitled “DISPLAY APPARATUS”, the entire content of which is incorporated herein by reference 
     TECHNICAL FIELD 
     The present disclosure relates to the field of display technologies, and in particular to a display apparatus. 
     BACKGROUND 
     A digital signage refers to a multimedia professional audio-visual system, which releases commercial, financial and entertainment information through a large-screen terminal display device in large shopping malls, supermarkets, hotel lobbies, restaurants, cinemas and other public places where people gather. At present, there are two forms of common digital signages in the market: landscape-screen digital signages and portrait-screen digital signages. In addition, there are two types of digital signages: a single-sided digital signage with one screen for single-sided display and a double-sided digital signage with two screens that are arranged back to back and that are used for double-sided display. 
     SUMMARY 
     Embodiments of the present disclosure provide a display apparatus. 
     An embodiment of the present disclosure provides a display apparatus. The display apparatus includes a support and a display module, wherein a frame is disposed at a periphery of the display module; the frame includes two first frame segments which are oppositely arranged and two second frame segments which are oppositely arranged; the support includes a support part and a rotation part; one end of the rotation part is pivoted to the support part; a rotation axis of the rotation part is a center line of the rotation part; the other end of the rotation part is fixedly connected to any one of the first frame segments and the second frame segments; the axis of the rotation part is at a first included angle with a frame segment connected to the the rotation part; and the first included angle is used for switching of the display module between a landscape-screen mode and a portrait-screen mode. 
     Optionally, the support part includes a base and a support sleeve, wherein one end of the support sleeve is fixedly connected to the base; the rotation part includes a movable sleeve; one end of the movable sleeve is pivoted to the other end of the support sleeve; and the other end of the movable sleeve is fixedly connected to the frame of the display module. 
     Optionally, the support sleeve includes a vertical segment and a transition segment, wherein the vertical segment is perpendicularly connected to the base; the transition segment is fixedly connected to the vertical segment and pivoted to the movable sleeve; an axis of the transition segment is at a second included angle with an axis of the vertical segment; and the second included angle ranges from 130 degrees to 140 degrees. 
     Optionally, a drive motor is provided in the movable sleeve, wherein a rotation shaft of the drive motor is fixedly connected to the transition segment; a housing of the drive motor is coaxial with the movable sleeve; an annular space is provided between the housing of the drive motor and the movable sleeve; and the housing of the drive motor is fixedly connected to one end of the movable sleeve. 
     Optionally, an elbow end cap is provided in the transition segment of the support sleeve, wherein the elbow end cap is fixedly connected to an inside wall of the transition segment; and the rotation shaft of the drive motor penetrates through the end of the movable sleeve and is fixedly connected to the elbow end cap. 
     Optionally, the support part further includes a tightening sleeve, wherein one end of the tightening sleeve is oppositely connected the transition segment; the other end of the tightening sleeve is sleeved on an outside of the movable sleeve; a locating bearing and a cupped rotation shaft are provided in the tightening sleeve; the cupped rotation shaft is fitted with an inner ring of the locating bearing; one end of the cupped rotation shaft is fixedly connected to the elbow end cap; and the other end of the cupped rotation shaft is fixedly connected to the rotation shaft of the drive motor. 
     Optionally, the locating bearing is a double-row bearing. 
     Optionally, an inner ring of the double-row bearing is in the shape of a truncated cone. 
     Optionally, a bearing bushing is also provided in the tightening sleeve, wherein the bearing bushing is disposed between the locating bearing and the movable sleeve; one end of the cupped rotation shaft proximal to the drive motor extends into the bearing bushing; and the rotation shaft of the drive motor is disposed in the elbow end cap. 
     Optionally, an end of the movable sleeve distal from the display module has a first slot, wherein the first slot is arranged along a circumference of the movable sleeve; a central angle of the first slot is an angle of the first slot; a plurality of circumferentially spaced second slots are formed in the elbow end cap; a central angle of any second slot is an angle of the second slot; and a sum of the angle of the first slot and that of the second slot is greater than 180 degrees. 
     Optionally, the angle of the first slot ranges from 140 degrees to 160 degrees. 
     Optionally, the angle of the first slot is 150 degrees. 
     Optionally, the angle of the second slot ranges from 30 degrees to 50 degrees. 
     Optionally, the angle of the second slot is 40 degrees. 
     Optionally, the frame segment connected to the rotation part has a mounting hole, wherein the mounting hole extends into the display module; the drive motor is disposed in the mounting hole; and the movable sleeve is fixedly connected to the frame at a periphery of the mounting hole. 
     Optionally, the mounting hole is disposed at a midpoint in a length direction of the frame segment. 
     Optionally, the drive motor is a coaxial gear motor. 
     Optionally, a rotational speed of the coaxial gear motor ranges from 3 rpm to 10 rpm. 
     Optionally, the first included angle ranges from 40 degrees to 50 degrees. 
     Optionally, the display module is a double-sided digital signage. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view of a display apparatus whose display module is in a landscape-screen state according to an embodiment of the present disclosure; 
         FIG. 2  is a front view of  FIG. 1  according to an embodiment of the present disclosure; 
         FIG. 3  is a side view of a display apparatus whose display module is in an intermediate state according to an embodiment of the present disclosure, wherein the intermediate state is between a landscape-screen state and a portrait-screen state; 
         FIG. 4  is a side view of a display apparatus whose display module is in a portrait-screen state according to an embodiment of the present disclosure; 
         FIG. 5  is a front view of  FIG. 4  according to an embodiment of the present disclosure; 
         FIG. 6  is an exploded diagram of a rotation part and a support part of a display apparatus according to an embodiment of the present disclosure; 
         FIG. 7  is a schematic diagram of internal structures of a rotation part and a support part of a display apparatus according to an embodiment of the present disclosure; 
         FIG. 8  is a schematic sectional view of B-B in  FIG. 7  according to an embodiment of the present disclosure; 
         FIG. 9  is a schematic sectional view of A-A in  FIG. 7  according to an embodiment of the present disclosure; and 
         FIG. 10  is a schematic sectional view of C-C in  FIG. 9  according to an embodiment of the present disclosure. 
     
    
    
     Reference numerals in the figures are as follows:
           100 —support;     110 —rotation part;     111 —movable sleeve;  111   a —end;  111   b —first slot;     112 —drive motor;  112   a —rotation shaft;     120 —support part;     121 —support sleeve;  121   a —vertical segment;  121   b —transition segment;  1211 —elbow end cap;  1211   a —second slot;     122 —base;     130 —tightening sleeve;  131 —locating bearing;  132 —cupped rotation shaft;  133 —bearing bushing;     200 —display module;     210 —frame;  210   a —first frame segment;  210   b —second frame segment; and     300 —electric wire.       

     DETAILED DESCRIPTION 
     The following describes the present disclosure in detail. Examples of embodiments of the present disclosure are illustrated in the accompanying drawings. Reference numerals which are the same or similar throughout the accompanying drawings represent the same or similar components or components with the same or similar functions. In addition, if a detailed description of the known technology is unnecessary for the illustrated feature of the present disclosure, it will be omitted. The embodiments described below with reference to the accompanying drawings are examples and are merely used to explain the present disclosure, rather than being construed as limitations to the present disclosure. 
     Those skilled in the art will appreciate that all terms (including technical and scientific terms) as used herein have the same meanings as commonly understood by those of ordinary skill in the art of the present disclosure, unless otherwise defined. It should be further understood that terms such as those defined in the general dictionary should be understood to have the meanings consistent with the meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal meaning unless specifically defined as herein. 
     Those skilled in the art will appreciate that the singular forms “a”, “an”, “the”, “said” and “this” may also encompass plural forms, unless otherwise stated. It should be further understood that the expression “include/comprise” used in the description of the present disclosure means there is a feature, an integer, a step, an operation, an element and/or a component, but could not preclude existing or adding of one or more other features, integers, steps, operations, elements, components and/or groups thereof. The expression “and/or” as used herein includes all or any one of one or more of relevant listed items and all combinations thereof. 
     The technical solution of the present disclosure and how the technical solution of the present disclosure resolves the foregoing technical problem are described in detail below with reference to specific embodiments. 
     A digital signage that can switch between a landscape-screen state and a portrait-screen state via rotation is more adaptable to content display. In addition, a movable mechanism can attract more attention and gain a better content propagation effect. 
     Currently, only a single-sided digital signage can switch between the landscape-screen state and the portrait-screen state via rotation, but a double-sided digital signage cannot. 
       FIG. 1  is a side view of a display apparatus whose display module is in a landscape-screen state according to an embodiment of the present disclosure. Referring to  FIG. 1 , the display apparatus includes a display module  200  and a support  100  configured to support the display module  200 . The support  100  is provided with a support part  120  and a rotation part  110 . The support part  120  is disposed on the ground or a platform and supports the display module  200 . The rotation part  110  and the support part  120  are pivoted to each other, that is, the rotation part  110  rotates around a rotation axis of the rotation part  110  relative to the support part  120 , and a rotation axis of the rotation part  110  is a center line of the rotation part  110 . How to implement rotation is not limited in this embodiment, provided that the rotation part  110  can rotate around the center line. 
       FIG. 2  is a front view of  FIG. 1  according to an embodiment of the present disclosure. It should be noted that, as shown in  FIG. 2 , the display module  200  in this embodiment of the present disclosure is a display device. A frame  210  of the display module  200  is an outer frame (the outer frame can be viewed as a part of a housing) of the display device. The outer frame is disposed at a periphery of a display panel, to protect the display panel. The frame  210  includes two oppositely arranged first frame segments  210   a  and two oppositely arranged second frame segments  210   b.    
     That the entire display module  200  is similar to a cuboid is used as an example for description. Still referring to  FIG. 2 , the first frame segments  210   a  are longer frame segments of the display module  20 , and the second frame segments  210   b  are shorter frame segments of the display module  200 . 
     Further, one end of the rotation part  110  distal from the support part  120  is fixedly connected to the frame  210  of the display module  200 . The rotation part  110  drives the display module  200  to rotate, thereby implementing switching of the display module  200  between a landscape-screen state and a portrait-screen state. The rotation part  110  may be fixedly connected to one of the first frame segments  210   a  or one of the second frame segments  210   b  of the display module  200 . For example, the fixed connection may be implemented by using a connector such as a screw. 
     In  FIG. 2 , that the rotation part  110  is fixedly connected to the first frame segment  210   a  is used as an example for description. In order to reduce the range of an angle that needs to be adjusted after the switching of the display module  200  between the landscape-screen state and the portrait-screen state, both the rotation part  110  and the display module  200  are axially symmetric figures. It can be viewed as that an axis of symmetry of the rotation part  110  and that of the display module  200  are basically in a same plane. There is a first included angle (a in  FIG. 2 ) between the rotation axis of the rotation part  110  and the first frame segment  210   a  of the display module  200 . The first included angle can be viewed as an included angle formed when the rotation part  110  and the first frame segment  210   a  are basically in a same plane. For the first included angle formed when the rotation part  110  is connected to the second frame segment  210   b , reference may be made to the condition when the rotation part  110  is connected to the first frame segment  210   a . Details are not described again in this embodiment of the present disclosure. 
     Further, the first included angle α ranges from 40 degrees to 50 degrees inclusive. That the first included angle ranges from 40 degrees to 50 degrees can ensure that the switching between the landscape-screen state and the portrait-screen state is realized after rotation (for example, the switching fails when the first included angle is 90 degrees), and can further ensure that the screen is basically in a landscape state or a portrait state after the switching (if the included angle is too large or too small, the display module is in a large-deviation state after the rotation). Therefore, basic display requirements can be met without extra adjustment. 
     In addition, that the display module  200  is in the landscape-screen state means that the first frame segments  210   a  of the display module  200  are horizontal or approximately horizontal (as shown in  FIGS. 1 and 2 ). 
       FIG. 3  is a side view of a display apparatus whose display module is in an intermediate state according to an embodiment of the present disclosure, wherein the intermediate state is between a landscape-screen state and a portrait-screen state. Referring to  FIG. 3 , when the landscape-screen state of the display module  200  is adjusted, the display module  200  is in the intermediate state between a horizontal state and a vertical state. 
       FIG. 4  is a side view of a display apparatus whose display module is in a portrait-screen state according to an embodiment of the present disclosure.  FIG. 5  is a front view of  FIG. 4  according to an embodiment of the present disclosure. Referring to  FIGS. 4 and 5 , that the display module  200  is in the portrait-screen state means that the second frame segments  210   b  of the display module  200  are horizontal or approximately horizontal. 
     In this embodiment of the present disclosure, a support  100  of the display apparatus has a rotation part  110  and a support part  120  that can rotate relatively. A central axis of the rotation part  110  is at a first included angle with a frame  210  of the display module  200 . The first included angle is controlled within a certain range, so that the rotation part  110  can drive the display module  200  to rotate, and switching between a landscape-screen state and a portrait-screen state can be implemented according to a display requirement. In addition, the display module  200  has almost no deviation after the switching, and a normal display requirement can be met without extra adjustment. Because the rotation part is fixedly connected to the frame of the display module, without impacting normal display of the display module, switching of a double-sided display module between a landscape-screen state and a portrait-screen state can be implemented. In addition, a structure is simple, and mounting and maintenance are easy. 
     Optionally, an inventor of the present disclosure discovers via research that, as shown in  FIG. 2 , when the first included angle α between the axis of the rotation part  110  and the first frame segment  210   a  of the display module  200  is 45 degrees, the rotation part  110  just rotates by 180 degrees, and the switching of the display module  200  between the landscape-screen state and the portrait-screen state can be realized. In addition, after the switching, the screen of the display module  200  can be kept in a horizontal state (corresponding to the landscape-screen state) or a vertical state (corresponding to the portrait-screen state), without extra adjustment of the screen. 
     For example, it is assumed that the display module  200  is in the horizontal state which is the initial state. After rotating along with the rotation part  110  by 180 degrees, the display module  200  is just switched to the vertical state. Similarly, it is assumed that the display module  200  is in the vertical state which is the initial state. After rotating along with the rotation part  110  by 180 degrees, the display module  200  is just switched to the horizontal state. 
     In this embodiment of the present disclosure, the first included angle α between the axis of the rotation part  110  and the frame  210  of the display module  200  is restricted to 45 degrees, so that the display module  200  can switch between the landscape-screen state and the portrait-screen state under the driving of the rotation part  110 . In addition, the screen has no deviation after the switching, thereby improving a display effect of the display apparatus. 
     Optionally, the embodiments of the present disclosure provide the following possible implementation for the support part  120  and the rotation part  110 : 
       FIG. 6  is an exploded diagram of a rotation part and a support part of a display apparatus according to an embodiment of the present disclosure.  FIG. 7  is a schematic diagram of internal structures of a rotation part and a support part of a display apparatus according to an embodiment of the present disclosure.  FIG. 8  is a schematic sectional view of B-B in  FIG. 7  according to an embodiment of the present disclosure.  FIG. 9  is a schematic sectional view of A-A in  FIG. 7  according to an embodiment of the present disclosure. With reference to  FIGS. 2, 6, 7 and 9 , the support part  120  in the embodiments of the present disclosure includes a base  122  and a support sleeve  121 . One end of the support sleeve  121  is fixedly connected to the base  122 . The rotation part  110  includes a movable sleeve  111 . One end of the movable sleeve  111  is pivoted to one end of the support sleeve  121  distal from the base  122 . The other end of the movable sleeve  111  is fixedly connected to the frame  210  of the display module  200 . The base  122  may be in the shape of a plate or a platform, and may be made of a high-density material, so that the entire support part  120  is structurally stabler, and the display module  200  can be prevented from turning to one side. 
     For example, referring to  FIG. 7 , both the support sleeve  121  and the movable sleeve  111  have hollow structures. An electric wire  300  (including circuits such as a power cord and a signal line) used for normal display of the display module  200  may penetrate through the support sleeve  121  and the movable sleeve  111 . In addition, corresponding locating parts and transmission parts may be arranged in the support sleeve  121  and the movable sleeve  111 . An implementation of pivoting the support sleeve  121  to the movable sleeve  111  is not specifically limited in this embodiment of the present disclosure, provided that the movable sleeve  111  can rotate freely relative to the support sleeve  121 . 
     Optionally, still referring to  FIGS. 6 and 7 , the support sleeve  121  in the embodiments of the present disclosure includes a vertical segment  121   a  and a transition segment  121   b . The vertical segment  121   a  is perpendicularly connected to the base  122 . For example, the connection may be bolted connection, welding, or clamping. An axis of the transition segment  121   b  is at a second included angle with an axis of the vertical segment  121   a . A sum of the second included angle and the first included angle is 180 degrees, that is, the second included angle ranges from 130 degrees to 140 degrees. The vertical segment  121   a  supports the display module  200 , so that the display module  200  is above a plane where a bottom surface of the base  122  is disposed, and a space is reserved for rotary switching between the landscape-screen state and the portrait-screen state. 
     Further, a smooth transitional connection may be adopted between the transition segment  121   b  and the vertical segment  121   a . The smooth transitional connection part may have a structure similar to an arc-shaped sleeve, thereby forming an elbow part of the support sleeve  121 . The structure of the smooth transitional connection part can improve structural strength of the entire support sleeve  121 . The transition segment  121   b , the vertical segment  121   a  and the base  122  form the entire support part  120 . The transition segment  121   b  is pivoted to the movable sleeve  111 , that is, the movable sleeve  111  can rotate relative to the transition segment  121   b . The movable sleeve  111  drives the display module  200  to rotate, thereby implementing the switching of the display module  200  between the landscape-screen state and the portrait-screen state. 
     Optionally, the embodiments of the present disclosure provide the following possible implementation for relative rotation between the movable sleeve  111  and the transition segment  121   b  of the support sleeve  121 : 
     Still referring to  FIGS. 6, 7 and 9 , a drive motor  112  is provided in the movable sleeve  111 . A rotation shaft of the drive motor  112  is fixedly connected to the transition segment  121   b . A housing of the drive motor  112  is coaxial with the movable sleeve  111 , which facilitates their synchronous rotation. An annular space is provided between the housing of the drive motor  112  and an inside wall of the movable sleeve  111 . Due to the annular space, interference can be avoided during relative rotation between the drive motor  112  and the movable sleeve  111 , and arrangement of the electric wire  300  is facilitated. 
     Further, the housing (a part rotating relative to the rotation shaft  112   a ) of the drive motor  112  is fixedly connected to one end of the movable sleeve  111  (for example, via bolted connection), so that the movable sleeve  111  rotates along with the housing of the drive motor  112 . 
     In order to implement relative rotation between the transition segment  121   b  and the movable sleeve  111 , an elbow end cap  1211  is provided in the transition segment  121   b  of the support sleeve  121 . The elbow end cap  1211  is fixedly connected to an inside wall of the transition segment  121   b  (for example, via threaded connection). An end  111   a  of the movable sleeve  111  has a slot through which the rotation shaft  112   a  of the drive motor  112  penetrates. The rotation shaft  112   a  of the drive motor  112  extends out of the slot, and is fixedly connected to the elbow end cap  1211 . 
     When the rotation shaft  112   a  of the drive motor  112  works, because the rotation shaft  112   a  is connected to the elbow end cap  1211 , it can be viewed that the rotation shaft  112   a  is connected to the entire support part  120 , the rotation shaft  112   a  can be viewed as relatively still, and the housing of the drive motor  112  rotates relative to the rotation shaft  112   a , thereby driving the movable sleeve  111  connected to the housing of the drive motor  112  to rotate, and further implementing the switching of the display module  200  between the landscape-screen state and the portrait-screen state. 
     In the embodiments of the present disclosure, a single drive motor  112  is used to drive the movable sleeve  111  to rotate relative to the support sleeve  121 . Therefore, the switching of the display module  200  between the landscape-screen state and the portrait-screen state can be implemented. In addition, a structure is simple, and mounting and maintenance are easy. 
     Optionally, the drive motor  112  may be a coaxial gear motor. The coaxial gear motor can rotate synchronously with the movable sleeve  111 . In addition, a rotational speed is slow and easy to control. 
     Optionally, the rotational speed of the drive motor  112  ranges from 3 rpm to 10 rpm inclusive. That the rotational speed of the drive motor  112  is controlled within 3 rpm to 10 rpm can guarantee safety of the display module  200  and ensure that a rotational posture of the display module  200  is easy to control. 
     In some embodiments, still referring to  FIGS. 7 and 9 , in addition to the base  122  and the support sleeve  121 , the support part  120  in the embodiments of the present disclosure further includes a tightening sleeve  130 . One end of the tightening sleeve  130  may be oppositely connected the transition segment  121   b  via the elbow end cap  1211 . The other end of the tightening sleeve  130  is sleeved on an outside of the movable sleeve  111 , that is, one end of the movable sleeve  111  distal from display module  200  is embedded in the tightening sleeve  130 . 
     Further, a locating bearing  131  and a cupped rotation shaft  132  are provided in the tightening sleeve  130 . The cupped rotation shaft  132  is fitted with an inner ring of the locating bearing  131 . One end of cupped rotation shaft  132  may be fixedly connected to the elbow end cap  1211  via a bolt. The other end of the cupped rotation shaft  132  is fixedly connected to the rotation shaft  112   a  of the drive motor  112 . 
     Optionally, the locating bearing  131  may be a double-row bearing. An inner ring of the double-row bearing has a truncated cone-shaped structure. A diameter at one end of the truncated cone-shaped structure proximal to the drive motor  112  is greater than that at one end of the truncated cone-shaped structure distal from the drive motor  112 . An appearance of the cupped rotation shaft  132  also has a truncated cone-shaped structure, to be fitted with the inner ring of the double-row bearing better. A through hole is axially formed in the cupped rotation shaft  132 . The through hole is used for penetration of the electric wire  300  and reducing weight of the cupped rotation shaft  132 . Support and axial locating of the cupped rotation shaft  132  can be realized by using the locating bearing  131 , thereby enhancing strength of a connection between the rotation part  110  and the support part  120 , and stably supporting the display module  200 . 
     In some embodiments, still referring to  FIGS. 7 and 9 , in order to space the drive motor  112  axially, in addition to the locating bearing  131  and the cupped rotation shaft  132 , the tightening sleeve  130  in the embodiments of the present disclosure further has a bearing bushing  133  inside. The bearing bushing  133  is disposed between the locating bearing  131  and the end  111   a  of the movable sleeve  111 . One end of the bearing bushing  133  abuts on an outer ring of the locating bearing  131 . The other end of the locating bearing  131  abuts to a wall of the movable sleeve  111 . 
     Further, one end of the cupped rotation shaft  132  proximal to the drive motor  112  extends into the bearing bushing  133 . In addition, the rotation shaft  112   a  of the drive motor  112  is disposed in the elbow end cap  1211 , that is, the cupped rotation shaft  132  and the rotation shaft  112   a  of the drive motor  112  are fixedly connected to each other in the bearing bushing  133 . 
     In some embodiments, the inventor of the present disclosure considers that, as shown in  FIG. 7 , the switching of the display module  200  between the landscape-screen state and the portrait-screen state in a bracket requires 180-degrees rotation of the movable sleeve  111  relative to the tightening sleeve  130 . Because the electric wire  300  is provided in the movable sleeve  111 , the tightening sleeve  130  and the support sleeve  121 , the electric wire  300  has high possibilities of twist and damage if the movable sleeve  111  rotates back and forth for a long time. Based on this, the embodiments of the present disclosure provide the following possible implementation for structures of the movable sleeve  111  and the elbow end cap  1211 : 
       FIG. 10  is a schematic sectional view of C-C in  FIG. 9  according to an embodiment of the present disclosure. As shown in  FIGS. 6, 9 and 10 , an end of the movable sleeve  111  distal from the display module  200  has a first slot  111   b . The first slot  111   b  is arranged along a circumference of the movable sleeve  111 . The first slot  111   b  is disposed at the end  111   a  of the movable sleeve  111  and proximal to a wall of the movable sleeve, and corresponds to preset clearances in the housing of the drive motor  112  and in a bracket on an inside wall of the movable sleeve  111 , thereby facilitating mounting of the electric wire  300 , without impacting mounting of the drive motor  112 . 
     As shown in  FIGS. 7 and 8 , a plurality of circumferentially spaced second slots  1211   a  are formed in an end of the elbow end cap  1211 . A corresponding electric wire  300  can be arranged in each second slot  1211   a  according to actual needs 
     Example wiring of the electric wire  300  is shown in  FIG. 7 . The electric wire  300  is first led out of the display module  200 , enters the movable sleeve  111 , then passes through a clearance area between the movable sleeve  111  and the drive motor  112  together with a circuit of the drive motor  112 , penetrates through the first slot  111   b , enters the bearing bushing  133 , penetrates through a cavity in the cupped rotation shaft  132  and the second slots  1211   a , enters the support sleeve  121 , and is finally led out of the base  122  and electrically connected to an external apparatus. 
     Further, a central angle of the first slot  111   b  is an angle of the first slot  111   b . A central angle of any second slot  1211   a  is an angle of the second slot  1211   a . A sum of the angle of the first slot  111   b  and that of the second slot  1211   a  is greater than 180 degrees, that is, when the movable sleeve  111  rotates relative to the elbow end cap  1211  by 180 degrees, the first slot  111   b  and the second slot  1211   a  are still partially overlapped, which avoids damage to the electric wire  300 . 
     It should be noted that, the angle of the first slot  111   b  is a range of a central angle covered by the first slot  111   b  and is calculated by taking an axis of the movable sleeve  111  as a center; and the angle of the second slot  1211   a  is a range of a central angle covered by the second slot  1211   a  and is calculated by taking an axis of the elbow end cap  1211  as a center. 
     In this embodiment of the present disclosure, the first slot  111   b  is formed in the movable sleeve  111 , the second slot  1211   a  is formed in the support sleeve  121 , and the sum of the angle of the first slot  111   b  and that of the second slot  1211   a  is greater than 180 degrees. Therefore, damage to the electric wire  300  in the display module  200  can be avoided during the switching between the landscape-screen state and the portrait-screen state, thereby prolonging a service life of the entire display apparatus. 
     Optionally, in this embodiment of the present disclosure, the angle of the first slot  111   b  ranges from 140 degrees to 160 degrees inclusive. The angle of the first slot  111   b  is limited to 140 degrees to 160 degrees, which enlarges the angle of the slot as much as possible on the premise that structural strength is guaranteed, and prevents the electric wire  300  from being worn during rotation of the movable sleeve  111 . 
     Optionally, there may be three second slots  1211   a . An angle of each second slot  1211   a  ranges from 30 degrees to 50 degrees inclusive. The angle of the second slot  1211   a  is limited to 30 degrees to 50 degrees, which enlarges the angle of the slot as much as possible on the premise that structural strength is guaranteed, and prevents the electric wire  300  from being worn during rotation of the elbow end cap  1211  relative to the movable sleeve  111 . 
     Optionally, the angle of the first slot  111   b  may be 150 degrees. Accordingly, the angle of the second slot  1211   a  may be 40 degrees. 
     In some embodiments, still referring to  FIGS. 2 and 5 , a connection location between the movable sleeve  111  and the display module  200  may be in the first frame segment  210   a  or the second frame segment  210   b . Based on the connection location between the movable sleeve  111  and the frame  210  of the display module  200 , the first frame segment  210   a  has a mounting hole (not shown in the figure). The mounting hole extends into the display module  200 . The drive motor  112  in the movable sleeve  111  is fitted with the mounting hole, so that the drive motor  112  extends along the mounting hole into the display module  200 , and the drive motor  112  is prevented from interfering with a device in the display module  200 . 
     It may be understood that, if the movable sleeve  111  is fixedly connected to the first frame segment  210   a , the mounting hole is formed in the first frame segment  210   a ; if the movable sleeve  111  is fixedly connected to the second frame segment  210   b , the mounting hole is formed in the second frame segment  210   b.    
     In some embodiments, to improve structural stability of the support  100 , the movable sleeve  111  and the frame  210  of the display module  200  may be connected at a midpoint of the first frame segment  210   a  or the second frame segment  210   b . Accordingly, the mounting hole is disposed at a midpoint in a length direction of the first frame segment  210   a  or the second frame segment  210   b.    
     In this embodiment, the rotation part  110  of the support  100  is connected to the midpoint of the first frame segment  210   a  or the second frame segment  210   b  that is connected to the display module  200 , so that force born by the display module  200  and the movable sleeve  111  is distributed more uniformly, and the support  100  supports the display module  200  more stably. 
     Optionally, the display module  200  in the embodiments of the present disclosure is a double-sided digital signage. The double-sided digital signage has two display panels. To-be-displayed content (for example, an advertising slogan or a pattern) can be displayed on both sides of the double-sided digital signage. The display panels of the double-sided digital signage may be liquid crystal displays (LCD) or organic light-emitting diodes (OLED). 
     In this embodiment of the present disclosure, the rotation part  110  that can rotate relative to the support part  120  is connected to the double-sided digital signage, thereby driving the double-sided digital signage to rotate, and further implementing switching of the double-sided digital signage between a landscape-screen state and a portrait-screen state. In addition, the display apparatus is innovative in structural design, simple in structure, and easy to mount and maintain. 
     Each embodiment of the present disclosure at least has the following technical effects: 
     1. A support of the display apparatus has a rotation part and a support part that can rotate relatively. An axis of the rotation part is at a first included angle with a frame of a display module. The first included angle is controlled within a certain range, so that the rotation part can drive the display module to rotate, and switching between a landscape-screen state and a portrait-screen state can be implemented according to a display requirement. In addition, the display module has almost no deviation after the switching, and a normal display requirement can be met. Because the rotation part is fixedly connected to the frame of the display module, without impacting normal display of the display module, switching of a double-sided display module between a landscape-screen state and a portrait-screen state can be implemented. In addition, a structure is simple, and mounting and maintenance are easy. 
     2. The included angle between the axis of the rotation part and the frame of the display module is restricted to 45 degrees, so that the display module can switch between the landscape-screen state and the portrait-screen state under the driving of the rotation part. In addition, the screen has no deviation after the switching, thereby improving a display effect of the display apparatus. 
     3. Support and axial locating of the cupped rotation shaft can be realized by using the locating bearing, thereby enhancing strength of a connection between the rotation part and the support part, and stably supporting the display module. 
     4. A first slot is formed in a movable sleeve, a second slot is formed in a support sleeve, and a sum of an angle of the first slot and that of the second slot is greater than 180 degrees. Therefore, damage to an electric wire in the display module can be avoided during the switching between the switching between the landscape-screen state and the portrait-screen state, thereby prolonging a service life of the entire display apparatus. 
     5. The rotation part of the support is connected to a midpoint of a first frame segment or a second frame segment that is connected to the display module, so that force born by the display module and the movable sleeve is distributed more uniformly, and the support supports the display module more stably. 
     6. The rotation part that can rotate relative to the support part is connected to a double-sided digital signage, thereby driving the double-sided digital signage to rotate, and further implementing switching of the double-sided digital signage between a landscape-screen state and a portrait-screen state. In addition, the display apparatus is innovative in structural design, simple in structure, and easy to mount and maintain. 
     In the description of the present invention, it should be understood that the orientation or position relations indicated via terms of “central”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical” “horizontal”, “top”, “bottom”, “inner”, “outer”, and the like are based on orientation or the position relations shown in the drawings, only to describe the present disclosure conveniently and simplify the description, but not indicate or imply that referred apparatuses or elements must have particular orientations or be constructed and operated with the particular orientation, so that they cannot be construed as restrictions on the present disclosure. 
     The terms “first” and “second” are only for the purpose of description and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined by the terms “first” and “second” may include one or more of the features either explicitly or implicitly. In the description of the present disclosure, unless otherwise stated, the term “a plurality of” means two or more. 
     In the description of the present disclosure, it should be noted that, unless otherwise definitely specified and limited, the terms “mounted’, “connected to each other’, and “connected to’ need to be broadly understood, for example, connection may be fixed connection, or detachable connection or integrated connection; or may be direct connection, or indirect connection via an intermediation, or communication of inner parts of two elements. A person of ordinary skill in the art can understand the specific meaning of the above terms in the present disclosure in accordance with specific conditions. 
     In this specification, the specific feature, structure, material and characteristic described may be combined in an appropriate manner in any one or more embodiments or examples. 
     The foregoing descriptions are merely some implementations of the present disclosure. It should be noted that those of ordinary skill in the art may further make several improvements and refinements without departing from the principle of the present disclosure, and these improvements and refinements shall fall within the protection scope of the present disclosure.