Patent Description:
An LED display device with small-spacing needs to be designed with a function of maintenance from a front side and from a rear side, and the display device includes a box body, a display module arranged on a front side of the box body and an adapter plate detachably arranged on a rear side of the box body. The display module is detachably mounted on the box body through a magnetic attraction structure, and the adapter plate fits the display module through a connector in a plugging-in manner.

However, after maintenance of the adapter plate from the rear side, when the adapter plate fits the display module in the plugging-in manner, pushing force applied onto the adapter plate is transmitted onto the display module through the connector. When the pushing force is greater than magnetic attraction force of the magnetic attraction structure, the display module will be damaged after falling due to separation from the box body.

Examples of a display device according to the prior art are known from <CIT>. And examples of a tensioning lock and display screen box body according to the prior art are known from <CIT>.

A main objective of the invention is to provide a Light Emitting Diode (LED) display device, as to solve a problem that a display module in a related art falls due to separation from a box body.

To achieve the above objective, the invention provides an LED display device, including: a rectangle framework including a frame, a first transverse beam and a second transverse beam arranged inside the frame at intervals, a strip-like gap being formed by the first transverse beam, the second transverse beam and a part of the frame, an adapter plate assembly including a fixed plate mounted at the strip-like gap and an adapter plate detachably arranged on a rear side of the fixed plate, the fixed plate being provided with a lock, a display module, mounted on a front side of the rectangle framework through a magnetic attraction structure, a rear side of the display module being provided with a first strip-shaped lock hole, herein, the lock includes a rotary shaft rotatably arranged on the fixed plate and a first lock tongue arranged on the rotary shaft, the first lock tongue is able to go through the first strip-shaped lock hole and has a first unlocking position corresponding to the first strip-shaped lock hole and a first locking position that is staggered with the first strip-shaped lock hole, and the adapter plate fits the display module through a connector in a plugging-in manner.

In the invention, the adapter plate is provided with a second strip-shaped lock hole, and the lock further includes a second lock tongue arranged on the rotary shaft. The second lock tongue is able to go through the second strip-shaped lock hole and has a second unlocking position corresponding to the second strip-shaped lock hole and a second locking position that is staggered with the second strip-shaped lock hole, wherein, the second lock tongue is located at the second unlocking position when the first lock tongue is located at the first locking position, and the second lock tongue is located at the second locking position when the first lock tongue is located at the first unlocking position.

In some embodiments, the first lock tongue is arranged on a front end of the rotary shaft, the second lock tongue is arranged on a rear end of the rotary shaft, the first strip-shaped lock hole and the second strip-shaped lock hole are arranged correspondingly, and the second lock tongue and the first lock tongue are arranged perpendicularly.

In some embodiments, the lock further includes a lock seat arranged on the fixed plate, and the rotary shaft is rotatably arranged on the lock seat. The first lock tongue is of column-shaped, and the second lock tongue is of block-shaped.

In some embodiments, the display module includes a lamp panel and a rear plate arranged on a rear side of the lamp panel. The first strip-shaped lock hole is arranged on the rear plate, the fixed plate is provided with a via hole of avoiding the connector, and the connector includes a female connector arranged on the lamp panel and a male connector arranged on the adapter plate.

In some embodiments, each of the first transverse beam and the second transverse beam include a first transverse section, a second transverse section and a third transverse section that are connected in sequence. A distance between the second transverse section of the first transverse beam and the second transverse section of the second transverse beam is greater than a distance between the first transverse section of the first transverse beam and the first transverse section of the second transverse beam, and the distance between the second transverse section of the first transverse beam and the second transverse section of the second transverse beam is greater than a distance between the third transverse section of the first transverse beam and the third transverse section of the second transverse beam.

In some embodiments, the frame includes a first vertical side section, a first transverse side section, a second vertical side section and a second transverse side section that are connected in sequence. The first transverse beam and the second transverse beam are arranged at intervals in a vertical direction. Two ends of the first transverse beam are connected with the first vertical side section and the second vertical side section respectively, two ends of the second transverse beam are connected with the first vertical side section and the second vertical side section respectively, and the strip-like gap is enclosed by the first transverse beam, the second transverse beam, a part of the first vertical side section and a part of the second vertical side section. The rectangle framework further includes a plurality of first longitudinal beams located in the frame, the plurality of first longitudinal beams are arranged at intervals along a length direction of the rectangle framework, and two ends of each first longitudinal beam are connected with the first transverse side section and the first transverse beam respectively. A first rectangle hole is enclosed by the first longitudinal beam that is nearest to the first vertical side section, a part of the first transverse beam, a part of the first vertical side section and a part of the first transverse side section, a second rectangle hole is enclosed by the first longitudinal beam that is nearest to the second vertical side section, a part of the first transverse beam, a part of the second vertical side section and a part of the first transverse side section, and a third rectangle hole is enclosed by two adjacent first longitudinal beams, a part of the first transverse beam and a part of the first transverse side section. The first rectangle hole has a same shape as that of the second rectangle hole. A minimal cross section area of the first rectangle hole is greater than a maximal cross section area of the third rectangle hole, and a diagonal distance of the first rectangle hole is greater than a width of the display module.

In some embodiments, the rectangle framework further includes a plurality of second longitudinal beams located in the frame, the plurality of second longitudinal beams are arranged at intervals along a length direction of the frame, and two ends of each second longitudinal beam are connected with the second transverse side section and the second transverse beam respectively. A fourth rectangle hole is enclosed by the second longitudinal beam that is nearest to the first vertical side section, a part of the second transverse beam, a part of the first vertical side section and a part of the second transverse side section, a fifth rectangle hole is enclosed by the second longitudinal beam that is nearest to the second vertical side section, a part of the second transverse beam, a part of the second vertical side section and a part of the second transverse side section, and a sixth rectangle hole is enclosed by two adjacent second longitudinal beams, a part of the second transverse beam and a part of the second transverse side section. The fourth rectangle hole has a same shape as that of the fifth rectangle hole. A minimal cross section area of the fourth rectangle hole is greater than a maximal cross section area of the sixth rectangle hole, and a diagonal distance of the fourth rectangle hole is greater than the width of the display module.

In some embodiments, there are a plurality of display modules and a plurality of magnetic attraction structures, and each display module is spliced on the front side of the rectangle framework through the plurality of magnetic attraction structures.

In some embodiments, a front side of the frame, a front side of the first transverse beam and a front side of the second transverse beam are provided with a plurality of fixed seats, respectively. Each of the plurality of magnetic attraction structures includes a first magnetic attraction part arranged on one fixed seat and a second magnetic attraction part arranged on the rear side of the display module. The first magnetic attraction part fits the second magnetic attraction part in a magnetic attraction manner, and front sides of the first magnetic attraction parts of the plurality of magnetic attraction structures are coplanar.

With an adoption of the technical solution of the invention, the LED display device includes the rectangle framework, the adapter plate assembly and the display module. The rectangle framework includes the frame, the first transverse beam and the second transverse beam that are arranged inside the frame at intervals, and the strip-like gap is enclosed by the first transverse beam, the second transverse beam and the a part of the frame. The adapter plate assembly includes the fixed plate mounted at the strip-like gap and the adapter plate detachably arranged on the rear side of the fixed plate. In this way, the strip-like gap accommodates the adapter plate assembly. Thus, a thickness of the LED display device is reduced, and the LED display device is lighter and thinner. The fixed plate is provided with the lock. The display module is mounted on the front side of the rectangle framework through the magnetic attraction structure, and the rear side of the display module is provided with the first strip-shaped lock hole. In the invention, the lock includes the rotary shaft rotatably arranged on the fixed plate and the first lock tongue arranged on the rotary shaft. The first lock tongue is able to go through the first strip-shaped lock hole and has the first unlocking position corresponding to the first strip-shaped lock hole and the first locking position that is staggered with the first strip-shaped lock hole, and the adapter plate fits the display module through the connector in the plugging-in manner. During maintenance of the adapter plate from a rear side, the adapter plate is maintained after being dismounted from the rear side of the fixed plate. After the maintenance of the adapter plate from the rear side, the adapter plate is mounted on the fixed plate again and needs to fit the display module on the rectangle framework through the connector in the plugging-in manner. Before the adapter plate fits the display module in the plugging-in manner through the connector, the first lock tongue is switched to the first locking position from the first unlocking position, the first lock tongue fits the first strip-shaped lock hole in a staggered manner, and the first lock tongue locks the first strip-shaped lock hole, as to lock the display module on the rectangle framework. During the adapter plate fits the display module through the connector in the plugging-in manner, pushing force applied onto the adapter plate is transmitted onto the display module through the connector. When the pushing force is greater than a magnetic attraction force of the magnetic attraction structure, the display module is firmly locked on the rectangle framework by the lock, and would not be pushed far away from the rectangle framework by the pushing force. In this way, the display module is prevented from falling, a security protection is achieved, and accordingly the adapter plate is facilitated to be mounted on the rear side of the fixed plate. Therefore, the technical solution of the invention effectively solves the problem that the display module in the related art falls due to separation from the box body.

The accompanying drawings described herein are used to provide a further understanding of the invention, and constitute a part of the invention, and the exemplary embodiments of the invention and the description thereof are used to explain the invention, but do not constitute improper limitations to the invention. In the drawings:.

Herein, the above drawings include the following reference numbers:
<NUM>. Rectangle framework; <NUM>. Frame; <NUM>. First vertical side section; <NUM>. First transverse side section; <NUM>. Second vertical side section; <NUM>. Second transverse side section; <NUM>. First transverse beam; <NUM>. First transverse section; <NUM>. Second transverse section; <NUM>. Third transverse section; <NUM>. Second transverse beam; <NUM>. First longitudinal beam; <NUM>. Second longitudinal beam; <NUM>. Adapter plate assembly; <NUM>. Fixed plate; <NUM>. Fixed plate body; <NUM>. Middle section; <NUM>. End section; <NUM>. Avoiding hole; <NUM>. Convex edge; <NUM>. Via hole; <NUM>. Adapter plate; <NUM>. Second strip-shaped lock hole; <NUM>. Adapter plate body; <NUM>. Gasket housing; <NUM>. Mounting portion; <NUM>. Convex portion; <NUM>. Lock; <NUM>. First lock tongue; <NUM>. Lock seat; <NUM>. Rotary shaft; <NUM>. Second lock tongue; <NUM>. Limiting hole; <NUM>. Display module; <NUM>. First strip-shaped lock hole; <NUM>. Lamp panel; <NUM>. Rear plate; <NUM>. Connector; <NUM>. First magnetic attraction part; <NUM>. Second magnetic attraction part; <NUM>. Female connector; <NUM>. Male connector; <NUM>. Positioning structure; <NUM>. Positioning hole; <NUM>. Positioning piece; <NUM>. Positioning bead; <NUM>. Elastic piece; <NUM>. First fastener; <NUM>. Second fastener.

The technical solutions in the embodiments of the invention will be clearly and completely described below in combination with the drawings in the embodiments of the invention. It is apparent that the described embodiments are not all embodiments but part of embodiments of the invention. In fact, the description of at least one exemplary embodiment below is merely illustrative, and will not be taken as any limitation to the invention and its application or use. All other embodiments obtained by those of ordinary skill in the art on the basis of the embodiments in the invention without creative work shall fall within the scope of protection of the invention.

It should be noted that terms used herein are merely intended to describe specific embodiments rather than limit exemplary embodiments according to the invention. Unless otherwise pointed out explicitly, a singular form used herein is also intended to include a plural form. In addition, it should also be understood that the term "include" and/or "comprise" used in the description indicates that there are features, steps, operations, devices, assemblies and/or combinations thereof.

Unless otherwise specified, relative arrangements of parts and steps, digital expressions and values elaborated in these embodiments will not limit the scope of the invention. Meanwhile, it should be understood, to facilitate the description, that the sizes of all parts shown in the drawings are not drawn according to an actual proportionate relationship. The technologies, the methods and the equipment known by those of ordinary skill in the art may not be elaborated. However, where appropriate, the technologies, the methods and the equipment should be deemed to be part of the authorized specification. In all examples shown and discussed here, any specific values should be merely explained to be exemplary rather than taken as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that the similar reference numbers and letters indicate the similar items in the drawings below, so there is no need to further discuss it in subsequent drawings once an item is defined in one drawing.

As shown in <FIG>, an LED display device of the embodiment includes: a rectangle framework <NUM>, an adapter plate assembly <NUM> and a display module <NUM>. The rectangle framework <NUM> includes a frame <NUM>, a first transverse beam <NUM> and a second transverse beam <NUM> that are arranged inside the frame <NUM> at intervals. A strip-like gap is enclosed by the first transverse beam <NUM>, the second transverse beam <NUM> and a part of the frame <NUM>. The adapter plate assembly <NUM> includes a fixed plate <NUM> mounted at the strip-like gap and an adapter plate <NUM> detachably arranged on a rear side of the fixed plate <NUM>, and the fixed plate <NUM> is provided with a lock <NUM>. The display module <NUM> is mounted on a front side of the rectangle framework <NUM> through a magnetic attraction structure. A rear side of the display module <NUM> is provided with a first strip-shaped lock hole <NUM>. In the embodiment, the lock <NUM> includes a rotary shaft <NUM> rotatably arranged on the fixed plate <NUM> and a first lock tongue <NUM> arranged on the rotary shaft <NUM>. The first lock tongue <NUM> is able to go through the first strip-shaped lock hole <NUM> and has a first unlocking position corresponding to the first strip-shaped lock hole <NUM> and a first locking position that is staggered with the first strip-shaped lock hole <NUM>, and the adapter plate <NUM> fits the display module <NUM> through a connector <NUM> in a plugging-in manner.

With an adoption of the technical solution of the embodiment, the adapter plate assembly <NUM> includes the fixed plate <NUM> mounted at the strip-like gap and the adapter plate <NUM> detachably arranged on the rear side of the fixed plate <NUM>. In this way, the strip-like gap accommodates the adapter plate assembly <NUM>, and accordingly a thickness of the LED display device is reduced, and the LED display device is lighter and thinner. The fixed plate <NUM> is provided with the lock <NUM>. The display module <NUM> is mounted on the front side of the rectangle framework <NUM> through the magnetic attraction structure, and the rear side of the display module <NUM> is provided with the first strip-shaped lock hole <NUM>. In the embodiment, the lock <NUM> includes the rotary shaft <NUM> rotatably arranged on the fixed plate <NUM> and the first lock tongue <NUM> arranged on the rotary shaft <NUM>. The first lock tongue <NUM> is able to go through the first strip-shaped lock hole <NUM> and has the first unlocking position corresponding to the first strip-shaped lock hole <NUM> and the first locking position that is staggered with the first strip-shaped lock hole <NUM>, and the adapter plate <NUM> fits the display module <NUM> through the connector <NUM> in the plugging-in manner. During maintenance of the adapter plate from a rear side, the adapter plate is maintained after being dismounted from the rear side of the fixed plate <NUM>. After the maintenance of the adapter plate from the rear side, the adapter plate <NUM> is mounted on the fixed plate <NUM> again and needs to fit the display module <NUM> on the rectangle framework <NUM> through the connector <NUM> in the plugging-in manner. Before the adapter plate <NUM> fits the display module <NUM> in the plugging-in manner through the connector <NUM>, the first lock tongue <NUM> is switched to the first locking position from the first unlocking position, the first lock tongue <NUM> fits the first strip-shaped lock hole <NUM> in a staggered manner, and the first lock tongue <NUM> locks the first strip-shaped lock hole <NUM>, as to lock the display module <NUM> on the rectangle framework <NUM>. During the adapter plate <NUM> fits the display module <NUM> through the connector <NUM> in the plugging-in manner, pushing force applied onto the adapter plate <NUM> is transmitted onto the display module <NUM> through the connector <NUM>. When the pushing force is greater than a magnetic attraction force of the magnetic attraction structure, the display module <NUM> is firmly locked on the rectangle framework <NUM> by the lock <NUM>, and would not be pushed far away from the rectangle framework <NUM> by the pushing force. In this way, the display module is prevented from falling, a security protection is achieved, and accordingly the adapter plate <NUM> is facilitated to be mounted on the rear side of the fixed plate <NUM>. Therefore, the technical solution of the invention effectively solves a problem that a display module in a related art falls due to separation from a box body.

It is to be noted that the first strip-shaped lock hole <NUM> corresponds to the first lock tongue <NUM>, meaning that a projection of an outline of the first lock tongue <NUM> on a front side of the display module <NUM> coincides with the first strip-shaped lock hole <NUM>, or the projection of the outline of the first lock tongue <NUM> on the front side of the display module <NUM> is located in the first strip-shaped lock hole <NUM>.

As shown in <FIG>, <FIG> and <FIG>, the adapter plate <NUM> of the invention is provided with a second strip-shaped lock hole <NUM>. The lock <NUM> further includes a second lock tongue <NUM> arranged on the rotary shaft <NUM>, and the second lock tongue <NUM> is able to go through the second strip-shaped lock hole <NUM> and has a second unlocking position corresponding to the second strip-shaped lock hole <NUM> and a second locking position that is staggered with the second strip-shaped lock hole <NUM>. Wherein, the second lock tongue <NUM> is located at the second unlocking position when the first lock tongue <NUM> is located at the first locking position, and the second lock tongue <NUM> is located at the second locking position when the first lock tongue <NUM> is located at the first unlocking position. In this way, the second lock tongue <NUM> is located at the second unlocking position when the first lock tongue <NUM> is located at the first locking position, and the display module <NUM> is firmly locked on the rectangle framework <NUM> by the lock <NUM>. Meanwhile, because the second lock tongue <NUM> is located at the second unlocking position, the second lock tongue <NUM> is able to go through the second strip-shaped lock hole <NUM> on the adapter plate <NUM>. At this moment, by rotating the rotary shaft <NUM>, the first lock tongue <NUM> is switched to the first unlocking position from the first locking position and the second lock tongue <NUM> is switched to the second locking position from the second unlocking position, and the adapter plate <NUM> is fixed on the fixed plate <NUM> by the lock <NUM>. At this moment, because the first lock tongue <NUM> is located at the first unlocking position, the display module <NUM> is able to be taken down from the rectangle framework <NUM> for maintenance.

In addition, the inventor finds that, in the related art, a set of dismounting/mounting tool (such as a sleeve) is needed to dismount/mount a nut during maintenance of the adapter plate from a front side, and another set of dismounting/mounting tool (such as a wrench) is needed to dismount/mount a screw during maintenance of the adapter plate from the rear side. In this way, two sets of dismounting/mounting tools are used to realize maintenance for the adapter plate from the front side and from the rear side, and accordingly operations are complicated.

To solve the above problem, as shown in <FIG>, <FIG> and <FIG>, the adapter plate <NUM> of the invention is provided with the second strip-shaped lock hole <NUM>. The lock <NUM> further includes the second lock tongue <NUM> arranged on the rotary shaft <NUM>, and the second lock tongue <NUM> is able to go through the second strip-shaped lock hole <NUM> and has the second unlocking position corresponding to the second strip-shaped lock hole <NUM> and the second locking position that is staggered with the second strip-shaped lock hole <NUM>. Wherein, the second lock tongue <NUM> is located at the second unlocking position when the first lock tongue <NUM> is located at the first locking position, and the second lock tongue <NUM> is located at the second locking position when the first lock tongue <NUM> is located at the first unlocking position. In this way, during the maintenance of the adapter plate <NUM> from the front side, the second lock tongue <NUM> is located at the second locking position when the first lock tongue <NUM> is located at the first unlocking position, and the display module is able to be dismounted from the rectangle framework <NUM>. Because the adapter plate <NUM> is fixed on the fixed plate <NUM> by the lock <NUM>, the adapter plate <NUM> is able to be dismounted/mounted together with the fixed plate <NUM> when the fixed plate <NUM> is dismounted/mounted, and accordingly the maintenance of the adapter plate <NUM> from the front side is realized. During the maintenance of the adapter plate <NUM> from the rear side, the second lock tongue <NUM> is located at the second unlocking position when the first lock tongue <NUM> is located at the first locking position by rotating the rotary shaft <NUM>, and the second strip-shaped lock hole <NUM> on the adapter plate <NUM> is able to depart from the fixed plate <NUM>, thereby facilitating the adapter plate <NUM> to be dismounted from the rectangle framework <NUM>. In this way, the maintenance of the adapter plate <NUM> from the rear side is realized. Accordingly, the maintenance of the adapter plate <NUM> from the rear side is realized without using another dismounting/mounting tool in the related art, and quantity of the dismounting/mounting tools to be used is reduced. In this way, during the maintenance of the adapter plate <NUM> from the front side and from the rear side, there is no need to use two sets of dismounting/mounting tools in the related art, and the operations become simple.

As shown in <FIG>, <FIG> and <FIG>, in order to ensure that the first lock tongue <NUM> and the second lock tongue <NUM> both realize corresponding functions, during the second lock tongue <NUM> is located at the second unlocking position when the first lock tongue <NUM> is located at the first locking position or during the second lock tongue <NUM> is located at the second locking position when the first lock tongue <NUM> is located at the first unlocking position, the first lock tongue <NUM> is arranged on a front end of the rotary shaft <NUM>, and the second lock tongue <NUM> is arranged on a rear end of the rotary shaft <NUM>. Moreover, because the first strip-shaped lock hole <NUM> and the second strip-shaped lock hole <NUM> are arranged correspondingly, the first lock tongue <NUM> and the first lock tongue <NUM> are arranged perpendicularly. The second lock tongue <NUM> is stably and reliably located at the second unlocking position when the first lock tongue <NUM> is located at the first locking position, and the second lock tongue <NUM> is stably and reliably located at the second locking position when the first lock tongue <NUM> is located at the first unlocking position. On the contrary, the first lock tongue <NUM> is stably and reliably located at the first locking position when the second lock tongue <NUM> is located at the second unlocking position, and the first lock tongue <NUM> is stably and reliably located at the first unlocking position when the second lock tongue <NUM> is located at the second locking position.

As shown in <FIG>, in order to make the rotary shaft <NUM> reliably mounted on the fixed plate <NUM>, the lock <NUM> further includes a lock seat <NUM> arranged on the fixed plate <NUM>, and the rotary shaft <NUM> is rotatably arranged on the lock seat <NUM>. The first lock tongue <NUM> is of column-shaped, and the second lock tongue <NUM> is of block-shaped. The column-shaped first lock tongue <NUM> is conveniently machined and easily molded. When the second lock tongue <NUM> is located at the second locking position, the block-shaped second lock tongue <NUM> has an effect of reliably locking. Meanwhile, because the second lock tongue <NUM> is of block-shaped, a nice operating position is formed and the operations is facilitated, as to switch the second lock tongue <NUM> between the second unlocking position and the second locking position.

As shown in <FIG>, a part of the lock seat <NUM> is strip-shaped, and the strip-shaped lock seat <NUM> is located in the second strip-shaped lock hole <NUM>. In this way, the second lock tongue <NUM> is raised by the strip-shaped lock seat <NUM>, to prevent the second lock tongue <NUM> from interference with a structure (such as a component) on the adapter plate <NUM> when switching between the second locking position and the second unlocking position.

As shown in <FIG>, <FIG> and <FIG>, in order to make the second lock tongue <NUM> rapidly switched to the second unlocking position from the second locking position, or to the second locking position from the second unlocking position, the lock <NUM> further includes a positioning structure <NUM> arranged between the adapter plate <NUM> and the second lock tongue <NUM>.

As shown in <FIG>, <FIG> and <FIG>, the positioning structure <NUM> includes a positioning hole <NUM> and a positioning piece <NUM> fitting the positioning hole <NUM> in a positioning manner. The positioning hole <NUM> is arranged on the adapter plate <NUM>, and the positioning piece <NUM> is arranged on the second lock tongue <NUM>. The positioning hole <NUM> fits the positioning piece <NUM> in the positioning manner, in this way the positioning structure <NUM> is simple in structure.

Of course, in embodiments not shown in the drawings, the positioning piece is arranged on the adapter plate, and the positioning hole is arranged on the second lock tongue.

As shown in <FIG>, <FIG> and <FIG>, the positioning hole <NUM> is arranged on the adapter plate <NUM>, and the positioning piece <NUM> is arranged on the second lock tongue <NUM>. The positioning piece <NUM> includes a positioning bead <NUM> and an elastic piece <NUM>. The second lock tongue <NUM> is provided with a limiting hole <NUM>, the elastic piece <NUM> is located in the limiting hole <NUM>, and the positioning bead <NUM> is limited in the limiting hole <NUM>. A part of the positioning bead <NUM> is able to be located in the positioning hole <NUM>, in this way the second lock tongue <NUM> is kept at the second locking position. Elastic force far away from a direction of the second lock tongue <NUM> is applied to the positioning bead <NUM> by the elastic piece <NUM>, in this way the positioning bead <NUM> is subjected to the elastic force all the time. In order to make the positioning bead <NUM> stably limited in the limiting hole <NUM>, an equatorial plane of the positioning bead <NUM> is located in the limiting hole <NUM>. The above fit of the positioning bead <NUM> and the elastic piece <NUM> makes the positioning piece <NUM> have a function of scaling. When the positioning bead <NUM> is subjected to a pressing force to contract the positioning piece <NUM>, the second lock tongue <NUM> is able to move between the second locking position and the second unlocking position. When the positioning bead <NUM> is subjected to the elastic force only and accordingly the positioning piece <NUM> extends outward, the second lock tongue <NUM> is able to be stably kept at the second locking position or the second unlocking position. The above elastic piece is a spring.

As shown in <FIG>, <FIG> and <FIG>, the positioning hole <NUM> is arranged on the adapter plate <NUM>, and the positioning piece <NUM> is arranged on the second lock tongue <NUM>. The adapter plate <NUM> includes an adapter plate body <NUM> and a gasket housing <NUM> arranged on a rear side of the adapter plate body <NUM>, the second strip-shaped lock hole <NUM> is arranged on the gasket housing <NUM>, the adapter plate body <NUM> is provided with an avoiding hole corresponding to the second strip-shaped lock hole <NUM>, and the positioning hole <NUM> is arranged on the gasket housing <NUM>. During the adapter plate <NUM> is dismounted/mounted from/on the fixed plate <NUM>, the second lock tongue <NUM> goes through the second strip-shaped lock hole <NUM>, as to prevent the adapter plate <NUM> from being damaged due to collision of the second lock tongue <NUM> and the adapter plate <NUM>. The above second strip-shaped lock hole <NUM> is arranged on the gasket housing <NUM>, and the gasket housing <NUM> isolates the second lock tongue <NUM> from the adapter plate body <NUM>. In this way, the second lock tongue <NUM> is prevented from direct contact with the adapter plate body <NUM>, the second lock tongue <NUM> is prevented from collision with the adapter plate body <NUM>, and the adapter plate body <NUM> is protected. The gasket housing <NUM> is prepared from plastic.

As shown in <FIG>, <FIG> and <FIG>, in order to mount the adapter plate <NUM> on the fixed plate <NUM> reliably and rapidly, there are a plurality of gasket housings <NUM>, a plurality of locks <NUM> and a plurality of positioning structures <NUM>. Quantity of the locks <NUM> may be an even multiple of that of the gasket housings <NUM>, quantity of the positioning structures <NUM> may be an even multiple of that of the locks <NUM>. Each of the gasket housings <NUM> includes two mounting portions <NUM> and a convex portion <NUM> arranged between the two mounting portions <NUM>, second lock tongues <NUM> of two locks <NUM> are arranged in one-to-one correspondence with the two mounting portions <NUM>, one of the positioning hole <NUM> and the positioning piece <NUM> of each positioning structure <NUM> is arranged on one mounting portion <NUM>, and another of the positioning hole <NUM> and the positioning piece <NUM> of the each positioning structure <NUM> is arranged on the second lock tongue <NUM>.

As shown in <FIG>, in order to facilitate connection of the fixed plate <NUM> onto the first transverse beam <NUM> and the second transverse beam <NUM>, the fixed plate <NUM> includes a fixed plate body <NUM> and a plurality of convex edges <NUM> arranged on an edge of the fixed plate body <NUM> at intervals. A part of the convex edges <NUM> are detachably connected onto the first transverse beam <NUM> through first fasteners <NUM>, and a rest of the convex edges <NUM> are detachably connected onto the second transverse beam <NUM> through second fasteners <NUM>. The first fastener <NUM> and the second fastener <NUM> are screws.

As shown in <FIG>, in order to shield the strip-like gap with the fixed plate <NUM> and facilitate mounting, a width of the fixed plate body <NUM> is greater than that of the strip-like gap. The fixed plate body <NUM> includes a middle section <NUM> and two end sections <NUM> arranged on two ends of the middle section <NUM>, and a width of the end section <NUM> is smaller than that of the middle section <NUM>. In presence of the above sizes, a shape of the fixed plate body <NUM> fits a shape of the strip-like gap and a shape of the adapter plate <NUM>, thereby facilitating mounting and saving a cost.

As shown in <FIG>, and <FIG>, the adapter plate <NUM> is mounted on the fixed plate <NUM>. In order to avoid the fixed plate <NUM> from interference with components on the adapter plate <NUM>, the fixed plate body <NUM> is provided with a plurality of avoiding holes <NUM> at intervals. The plurality of avoiding holes <NUM> avoid the components on the adapter plate <NUM>, in this way the adapter plate <NUM> is flatly mounted on the fixed plate <NUM>.

As shown in <FIG>, <FIG>, and <FIG>, the display module <NUM> includes a lamp panel <NUM> and a rear plate <NUM> arranged on a rear side of the lamp panel <NUM>. In order to facilitate machining of the first strip-shaped lock hole <NUM> on the display module <NUM>, the first strip-shaped lock hole <NUM> is arranged on the rear plate <NUM>. The fixed plate <NUM> is provided with via hole <NUM> of avoiding the connector <NUM>. The connector <NUM> includes a female connector <NUM> arranged on the lamp panel <NUM> and a male connector <NUM> arranged on the adapter plate <NUM>. In this way, during the female male connector <NUM> fits the male connector <NUM> in a plugging-in manner, the fixed plate <NUM> is prevented from interference with the connector <NUM> due to arrangement of the via hole <NUM>.

As shown in <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, each of the first transverse beam <NUM> and the second transverse beam <NUM> includes a first transverse section <NUM>, a second transverse section <NUM> and a third transverse section <NUM> that are connected in sequence. A distance between the second transverse section <NUM> of the first transverse beam <NUM> and the second transverse section <NUM> of the section transverse beam <NUM> is greater than a distance between the first transverse section <NUM> of the first transverse beam <NUM> and the first transverse section <NUM> of the second transverse beam <NUM>, and the distance between the second transverse section <NUM> of the first transverse beam <NUM> and the second transverse section <NUM> of the second transverse beam <NUM> is greater than a distance between the third transverse section <NUM> of the first transverse beam <NUM> and the third transverse section <NUM> of the second transverse beam <NUM>. In this way, in presence of the above sizes, a middle part of the strip-like gap is wide and two ends are narrow. In this way, the shape of the strip-like gap fits the shape of the adapter plate <NUM>, the adapter plate <NUM> is reasonably accommodated, it is conducive to saving an inner space of the LED display device and reducing the thickness of the LED display device, and accordingly the LED display device is lighter and thinner.

As shown in <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, the frame <NUM> includes a first vertical side section <NUM>, a first transverse side section <NUM>, a second vertical side section <NUM> and a second transverse side section <NUM> that are connected in sequence. The first transverse beam <NUM> and the second transverse beam <NUM> are arranged at intervals in a vertical direction. Two ends of the first transverse beam <NUM> are connected onto the first vertical side section <NUM> and the second vertical side section <NUM> respectively, two ends of the second transverse beam <NUM> are connected with the first vertical side section <NUM> and the second vertical side section <NUM> respectively. The strip-like gap is enclosed by the first transverse beam <NUM>, the second transverse beam <NUM>, a part of the first vertical side section <NUM> and a part of the second vertical side section <NUM>. The rectangle framework <NUM> further includes a plurality of first longitudinal beams <NUM> located in the frame <NUM>, the plurality of first longitudinal beams <NUM> are arranged at intervals along a length direction of the rectangle framework <NUM>, and two ends of each first longitudinal beam <NUM> are connected onto the first transverse side section <NUM> and the first transverse beam <NUM> respectively. In this way, the rectangle framework <NUM> has an enough structural strength. A first rectangle hole is enclosed by the first longitudinal beam <NUM> that is nearest to the first vertical side section <NUM>, a part of the first transverse beam <NUM>, a part of the first vertical side section <NUM> and a part of the first transverse side section <NUM>, a second rectangle hole is enclosed by the first longitudinal beam <NUM> that is nearest to the second vertical side section <NUM>, a part of the first transverse beam <NUM>, a part of the second vertical side section <NUM> and a part of the first transverse side section <NUM>, and a third rectangle hole is enclosed by two adjacent first longitudinal beams <NUM>, a part of the first transverse beam <NUM> and a part of the first transverse side section <NUM>. The first rectangle hole has a same shape as that of the second rectangle hole. A minimal cross section area of the first rectangle hole is greater than a maximal cross section area of the third rectangle hole, and a diagonal distance of the first rectangle hole is greater than a width of the display module <NUM>.

When the display module <NUM> needs to be taken down from the rectangle framework <NUM> for the maintenance from the front side, make the first lock tongue <NUM> locate at the first unlocking position, and the display module <NUM> only needs to be unplugged from the rectangle framework <NUM> with force, in this way the display module <NUM> overcomes the magnetic attraction force of the magnetic attraction structure. When the display module <NUM> needs to be taken down from the rectangle framework <NUM> for the maintenance from the rear side, make the first lock tongue <NUM> locate at the first unlocking position, and the display module <NUM> is pushed forward through the first rectangle hole or the second rectangle hole, in this way the display module <NUM> is separated from the rectangle framework <NUM>. Then rotate the display module <NUM> so that the display module <NUM> is tilted. Because the diagonal distance of the first rectangle hole is greater than the width of the display module <NUM>, the display module <NUM> is able to go through the first rectangle hole or the second rectangle hole, and is able to be taken down from the rear side of the rectangle framework <NUM>.

It should be noted that the first rectangle hole meets conditions that two adjacent sides are vertical, and two opposite sides are parallel to each other, and an interior of the first rectangle hole can have structures such as a bulge, an included angle, a chamber and a transitional arc. A "cross section" in the "minimal cross section areas of the first rectangle hole" is perpendicular to an axis of the first rectangle hole. "The diagonal distance of the first rectangle hole is greater than the width of the display module <NUM>" refers to that one of two diagonal distances of the first rectangle hole is greater than the width of the display module <NUM>, or each of the two diagonal distances of the first rectangle hole is greater than the width of the display module <NUM>.

The above third rectangle hole forms a space for operations of a hand, thereby facilitating dismounting/mounting of the display module from/in the first rectangle hole or the second rectangle hole.

As shown in <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, the rectangle framework <NUM> further includes a plurality of second longitudinal beams <NUM> located in the frame <NUM>, the plurality of second longitudinal beams <NUM> are arranged at intervals along a length direction of the frame <NUM>, and two ends of each second longitudinal beam <NUM> are connected with the second transverse side section <NUM> and the second transverse beam <NUM> respectively. In this way, the rectangle framework <NUM> has the enough structural strength. A fourth rectangle hole is enclosed by the second longitudinal beam <NUM> that is nearest to the first vertical side section <NUM>, a part of the second transverse beam <NUM>, a part of the first vertical side section <NUM> and a part of the second transverse side section <NUM>, a fifth rectangle hole is enclosed by the second longitudinal beam <NUM> that is nearest to the second vertical side section <NUM>, a part of the second transverse beam <NUM>, a part of the second vertical side section <NUM> and a part of the second transverse side section <NUM>, and a sixth rectangle hole is enclosed by two adjacent second longitudinal beams <NUM>, a part of the second transverse beam <NUM> and a part of the second transverse side section <NUM>. The fourth rectangle hole has a same shape as that of the fifth rectangle hole. A minimal cross section area of the fourth rectangle hole is greater than a maximal cross section area of the sixth rectangle hole, and a diagonal distance of the fourth rectangle hole is greater than the width of the display module <NUM>.

In this embodiment, when the display module <NUM> needs to be taken down from the rectangle framework <NUM> for the maintenance from the rear side, as an alternative, the display module <NUM> is pushed forward through the fourth rectangle hole or the fifth rectangle hole, in this way the display module <NUM> is separated from the rectangle framework <NUM>. Then rotate the display module <NUM> so that the display module <NUM> is tilted. Because the diagonal distance of the fourth rectangle hole is greater than the width of the display module <NUM>, the display module <NUM> is able to go through the fourth rectangle hole or the fifth rectangle hole, and is able to be taken down from the rear side of the rectangle framework <NUM>.

It should be noted that the fourth rectangle hole meets conditions that two adjacent sides are vertical, and two opposite sides are parallel to each other, and an interior of the fourth rectangle hole can structures such as a bulge, an included angle, a chamber and a transitional arc. A "cross section" in the "minimal cross section areas of the fourth rectangle hole" is perpendicular to an axis of the fourth rectangle hole. "The diagonal distance of the fourth rectangle hole is greater than the width of the display module <NUM>" refers to that one of two diagonal distances of the fourth rectangle hole is greater than the width of the display module <NUM>, or each of the two diagonal distances of the fourth rectangle hole is greater than the width of the display module <NUM>.

The above sixth rectangle hole forms a space for operations of a hand, thereby facilitating dismounting/mounting of the display module from/in the fourth rectangle hole or the fifth rectangle hole.

As shown in <FIG>, <FIG>, in order to facilitate machining and manufacturing, there are a plurality of display modules <NUM> and a plurality of magnetic attraction structures. Each display module <NUM> is spliced on the front side of the rectangle framework <NUM> through the plurality of magnetic attraction structures. There are four display modules <NUM>, and a quantity of the magnetic attraction structures is at least four times of a quantity of the display modules. Namely, each display module <NUM> is spliced on the front side of the rectangle framework <NUM> through at least four magnetic attraction structures.

Specifically, as shown in <FIG>, in this embodiment, each display module <NUM> is spliced on the front side of the rectangle framework <NUM> through ten magnetic attraction structures.

Of course, the quantity of the display modules is not limited to four, but can also be one, two, three, five or more. The quantity of the magnetic attraction structures is determined according to the quantity of the display modules.

As shown in <FIG>, <FIG>, a front side of the frame <NUM>, a front side of the first transverse beam <NUM> and a front side of the second transverse beam <NUM> are provided with a plurality of fixed seats, respectively. Each of the plurality of magnetic attraction structures include a first magnetic attraction part <NUM> arranged on one fixed seat and a second magnetic attraction part <NUM> arranged on the rear side of the display module <NUM>. The first magnetic attraction part <NUM> fits the second magnetic attraction part <NUM> in a magnetic attraction manner. In this way, the each first magnetic attraction part <NUM> fits the corresponding second magnetic attraction part <NUM> in the magnetic attraction manner, thereby facilitating detachable mounting of the display module <NUM> on the front side of the rectangle framework <NUM>. Front sides of the first magnetic attraction parts <NUM> of the plurality of magnetic attraction structures are coplanar, thereby forming a flat mounting plane. In this way, the display modules <NUM> are ensured to be mounted on the front side of the rectangle framework <NUM> with a high flatness.

In the description of the invention, it is to be understood that orientation or position relationships indicated by terms "front", "back", "upper", "lower", "left", "right", "transverse", "longitudinal", "vertical", "horizontal", "top", "bottom" and the like are orientation or position relationships shown in the drawings usually, are adopted not to indicate or imply that indicated devices or components must be in specific orientations or structured and operated in specific orientations but only to conveniently describe the invention and simplify descriptions and thus should not be understood as limits to the scope of protection of invention. The orientations "inner" and "outer" are the inside and the outside relative to an outline of each part.

In order to facilitate description, a spatial relative term may be used here, such as "over", "above", "on an upper surface" and "on", to describe a spatial location relation between a device or a feature shown in the drawing and other devices or other features. It is to be understood that the spatial relative term aims at including different orientations of the device during use or operation outside the orientation described in the drawing. For example, if the device in the drawing is inverted, it may be described as that the device "above other devices or other structures" or "over other devices or other structures" shall be positioned "under other devices or other structures" or "below other devices or other structures". Therefore, an exemplary term "above" may include two orientations: "above" and "under". As an alternative, the device may be positioned with other different modes (<NUM>° rotation or positioned at other orientations), and the spatial relative description used here needs to be explained correspondingly.

In addition, it should be noted that terms "first", "second" and the like are used for limiting the parts, for facilitating distinguishing corresponding parts only. Unless otherwise stated, the above terms do not have special meanings, and accordingly should not be understood to limit the scope of protection of the invention.

Claim 1:
An LED display device, comprising:
a rectangle framework (<NUM>), comprising a frame (<NUM>), a first transverse beam (<NUM>) and a second transverse beam (<NUM>) arranged inside the frame (<NUM>) at intervals, and a strip-like gap being formed by the first transverse beam (<NUM>), the second transverse beam (<NUM>) and a part of the frame (<NUM>);
an adapter plate assembly (<NUM>), comprising a fixed plate (<NUM>) mounted at the strip-like gap and an adapter plate (<NUM>) detachably arranged on a rear side of the fixed plate (<NUM>), and the fixed plate (<NUM>) being provided with a lock (<NUM>); and
a display module (<NUM>), and a rear side of the display module (<NUM>) being provided with a first strip-shaped lock hole (<NUM>),
wherein, the lock (<NUM>) comprises a rotary shaft (<NUM>) rotatably arranged on the fixed plate (<NUM>) and a first lock tongue (<NUM>) arranged on the rotary shaft (<NUM>), the first lock tongue (<NUM>) is able to go through the first strip-shaped lock hole (<NUM>) and has a first unlocking position corresponding to the first strip-shaped lock hole (<NUM>) and a first locking position that is staggered with the first strip-shaped lock hole (<NUM>), and the adapter plate (<NUM>) fits the display module (<NUM>) through a connector (<NUM>) in a plugging-in manner;
characterized in that, the display module (<NUM>) is mounted on a front side of the rectangle framework (<NUM>) through a magnetic attraction structure and the adapter plate (<NUM>) is provided with a second strip-shaped lock hole (<NUM>), and the lock (<NUM>) further comprises a second lock tongue (<NUM>) arranged on the rotary shaft (<NUM>); the second lock tongue (<NUM>) is able to go through the second strip-shaped lock hole (<NUM>) and has a second unlocking position corresponding to the second strip-shaped lock hole (<NUM>) and a second locking position that is staggered with the second strip-shaped lock hole (<NUM>), wherein, the second lock tongue (<NUM>) is located at the second unlocking position when the first lock tongue (<NUM>) is located at the first locking position, and the second lock tongue (<NUM>) is located at the second locking position when the first lock tongue (<NUM>) is located at the first unlocking position.