CN219716020U - Display expansion device - Google Patents

Abstract

The utility model relates to the field of electronic product accessories, in particular to a display expansion device, which comprises a notebook clamping device and expansion screens which are detachable and hinged with two sides of the notebook clamping device, wherein the back surface of the notebook clamping device is also movably provided with a telescopic supporting leg, the notebook clamping device comprises a first clamping plate, a second clamping plate, a clamping strip and a spring, one end of the clamping strip is fixed on the first clamping plate, the spring is fixed on the second clamping plate, and the other end of the clamping strip is connected with the spring; the side edges of the first clamping plate and the second clamping plate are provided with a plurality of clamping claws for clamping the notebook. The notebook clamping device can clamp notebook computers with different sizes between the first clamping plate and the second clamping plate, and the stability of the notebook computers is ensured through the acting force of the springs. The expansion screens which are detachable at the two sides of the notebook clamping device can be added by a user on one or two screens at the two sides of the notebook clamping device so as to enlarge the display area.

Description

Display expansion device

Technical Field

The present utility model relates to the field of electronic product accessories, and more particularly, to a display expansion device.

Background

The notebook computer has the advantages of ensuring normal computer functions, along with small volume, light weight, convenient carrying and the like, so the notebook computer is popular with people, people can not leave the notebook computer in offices when going out, but due to the characteristics of portability, other functions are sacrificed, such as richness of screen display content and comfort and practicability when a user watches the screen. In order to expand the screen, a notebook computer is usually connected with a desktop screen or a projector, but the desktop screen and the projector are very inconvenient to carry and have poor mobility, and timely help cannot be given to the situation that a large screen is required to be used outside, so that a device which is convenient to carry and can expand the screen is required for a user who needs to expand the screen at any time in an outside office.

For this reason, chinese patent CN204143302U provides an expansion device for notebook computer, comprising expansion screen 2 and a connection device for connecting expansion screen 2 with notebook computer 1, the connection device realizes connection between expansion screen 2 and notebook computer 1, and is convenient to install or detach according to need. Specifically, the connecting device includes a fixing support 3 surrounding the periphery of the expansion screen 2, an inserting block 4 detachably connected with the fixing support 3, and a connecting wire 5 connecting the expansion screen 2 and the notebook computer 1, the fixing support 3 includes a first supporting rod 31, a second supporting rod 32, a third supporting rod 33 and a fourth supporting rod 34 which are sequentially connected end to end, since the expansion screen 2 is generally square, in order to attach the fixing support 3 to the expansion screen 2, the fixing effect of the fixing support 3 on the expansion screen 2 is ensured, the shape of the fixing support 3 is set to be square matched with the expansion screen 2, therefore, the positions of the first supporting rod 31 and the third supporting rod 33 of the fixing support 3 are opposite, the positions of the second supporting rod 32 and the fourth supporting rod 34 are opposite, the first supporting rod 31 is located above the expansion screen 2, the third supporting rod 33 is located below the expansion screen 2, in order to facilitate the insertion and extraction of the connecting wire 5 from the expansion screen 2, and the insertion hole for facilitating the connection of the connecting wire 5 to the expansion screen 2 is arranged on the third supporting rod 33, and the connection wire 5 is realized through the insertion hole.

In this patent solution, the following drawbacks exist: 1. the fixed bracket is connected with the plug-in block, so when the expansion screen 2 is matched with the fixed bracket 3, the fixed bracket and the plug-in block cannot adjust the angle, and the angle between the expansion screen and the notebook cannot be adjusted, so that the screen throwing effect of a user is affected.

2. In this scheme, "inserted block 4" is "7", the one end of horizontal pole 41 is equipped with the slot 43 with montant 42 looks adaptation, montant 42 is connected with horizontal pole 41 through slot 43 detachable, and detachable mode is convenient for accomodate arrangement and carry. The vertical rod 42 of the plug-in block 4 is provided with a second clamping groove 44 which is matched with the original screen 11 of the notebook computer 1, the edge of the vertical rod 42 and the edge of the original screen 11 are fixed, and the expansion screen 2 and the original screen 11 are connected by matching with the first clamping groove 37 on the second supporting rod 32 or the fourth supporting rod 34. "is fixed on the notebook screen through the insert 4, its fixed mode is extremely tedious and not firm enough.

3. The scheme can only install one expansion screen, has poor suitability and poor user experience.

Disclosure of Invention

In order to solve the above problems, the present utility model provides a display expansion device to solve the above technical problems.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the display expansion device comprises a notebook clamping device and an expansion screen which is detachable and hinged with two sides of the notebook clamping device, wherein a telescopic supporting leg is movably arranged on the back of the notebook clamping device; the side edges of the first clamping plate and the second clamping plate are provided with a plurality of clamping claws for clamping the notebook.

Further, the surface of the second clamping plate is provided with a movable rail for the clamping strip to pass through, one end of the clamping strip, which is close to the spring, moves in the movable rail, and a baffle plate is further arranged on the surface of the movable rail.

Further, the top and the below on second grip block surface all are provided with movable rail, and every movable rail is including the initial track and the firm track that connect gradually, and wherein initial track is close to the outside of second grip block, and initial orbital width is greater than the width of grip strip, and firm orbital width equals the grip strip, and initial track is close to the terminal width of firm track and gradually decreases simultaneously, and its width is decreased to unanimous with firm track width.

Further, one side of each of the first clamping plate and the second clamping plate is provided with a fitting notch, wherein the expansion screen is fitted at the fitting notch through a hinge piece and is hinged, two side walls of the fitting notch are provided with fitting convex strips extending along the notch direction, and two side walls of the fitting notch are also provided with elastic limiting devices positioned at the tail end positions of the fitting convex strips; the hinge piece comprises a first hinge plate and a second hinge plate hinged with the first hinge plate, wherein the two sides of the first hinge plate are provided with fitting strip-shaped grooves and limiting hole sites, the first hinge plate is fitted into the fitting notch, the fitting strip-shaped grooves are matched with the fitting convex strips, and the limiting hole sites are matched with the elastic limiting device.

Further, the end of the fitting bar groove of the first hinge plate is also communicated with a trumpet-shaped open inlet, and the width of the trumpet-shaped open inlet increases gradually in the direction away from the fitting bar groove.

Further, the tail end of the first hinge plate is further provided with a hinge bayonet, and the second hinge plate is movably assembled at the hinge bayonet through the hinge bayonet and the second hinge plate by the first damping rotating shaft, and the surface of the second hinge plate is further provided with a second damping rotating shaft which is movably connected with the expansion screen.

Further, a supporting leg accommodating groove is formed in the back face of the first clamping plate or the second clamping plate, the telescopic supporting leg comprises an outer supporting leg cylinder and a supporting leg sliding block movably arranged in the outer supporting leg cylinder, and the outer supporting leg cylinder is hinged with the supporting leg accommodating groove through the upper end of the supporting leg cylinder and the supporting leg accommodating groove through a third damping rotating shaft; the surface of supporting leg slider is provided with the spacing tooth that extends along its length direction, and is provided with the spacing tooth claw of elasticity through the spring activity in the outer supporting leg section of thick bamboo, and the spacing tooth claw of elasticity still is connected with unlocking button, and this unlocking button extends outside the outer supporting leg section of thick bamboo, wherein makes the spacing tooth claw of elasticity break away from spacing tooth through pressing the unlocking button.

Further, the tail end of the supporting leg containing groove, which is close to the supporting leg sliding block, is also provided with a yielding groove.

Further, the surfaces of the first clamping plate and the second clamping plate are respectively provided with an installation cover plate, and the surfaces of the installation cover plates are respectively attached with an insulating plastic film.

Further, the insulating plastic film is a MYLAR polyester film.

The utility model has the beneficial effects that:

1. the side edges of the first clamping plate and the second clamping plate are provided with a plurality of clamping claws, and the clamping force and stability of the clamping device on the notebook computer are improved.

2. The notebook clamping device can clamp notebook computers of different sizes between the first clamping plate and the second clamping plate of the clamping device, and stability and safety of the notebook computers are ensured through acting forces of the clamping strips and the springs.

3. Meanwhile, the two sides of the internal notebook clamping device are detachably provided with the expansion screens, and a user can add one or more screens on the two sides of the display expansion device so as to enlarge the display area and improve the working efficiency and the comfort level. These extension screens can be installed and adjusted according to the needs and preferences of the user, supporting different resolutions and display modes.

4. When the expansion screen is required to be folded, the expansion screen can be folded on the front or back of the notebook clamping device, so that the expansion screen is convenient to carry and store. When the expansion screen is needed, the expansion screen can be unfolded and matched with the notebook clamping device for use.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic view of the back structure of the present utility model.

FIG. 3 is a schematic diagram of the internal structures of the first clamping plate and the second clamping plate.

Fig. 4 is a schematic perspective view of the internal structures of the first clamping plate and the second clamping plate.

Fig. 5 is a schematic view of the back structures of the first clamping plate and the second clamping plate.

Fig. 6 is a view showing an internal structure of the second clamping plate.

Fig. 7 is a schematic structural view of the hinge.

Fig. 8 is a schematic structural view of a telescoping support leg.

Fig. 9 is a schematic view of the internal structure of the telescopic support leg.

Fig. 10 is a schematic view of the structure of the present utility model in a folded state.

Reference numerals illustrate: the notebook clamping device 1, the first clamping plate 11, the second clamping plate 12, the initial track 120, the stable track 121, the abdication groove 122, the clamping claw 13, the clamping strip 14, the spring 15, the assembly notch 16, the baffle 17, the assembly convex strip 161, the elastic limiting device 162, the expansion screen 2, the hinge 3, the first hinge plate 31, the second hinge plate 32, the second damping rotating shaft 33, the assembly strip groove 311, the limiting hole site 312, the trumpet-shaped open inlet 313, the telescopic supporting leg 4, the outer supporting leg cylinder 41, the supporting leg sliding block 42, the limiting tooth 421, the third damping rotating shaft 43, the unlocking button 44 and the elastic limiting tooth claw 45.

Detailed Description

Referring to fig. 1-10, the present utility model relates to an expansion device for a display, comprising a notebook clamping device 1 and expansion screens 2 detachably mounted on two sides of the notebook clamping device 1, wherein a telescopic supporting leg 4 is movably mounted on the back of the notebook clamping device 1, wherein the notebook clamping device 1 comprises a first clamping plate 11, a second clamping plate 12, a clamping strip 14 and a spring 15, one end of the clamping strip 14 is fixed on the first clamping plate 11, the spring 15 is fixed on the second clamping plate 12, and the other end of the clamping strip 14 is connected with the spring 15; wherein the surface of the second clamping plate 12 is provided with a movable rail for the clamping bar 14 to pass through, wherein the clamping bar 14 moves in the movable rail, and in order to ensure the stability of the movement of the clamping bar 14, a baffle 17 is further arranged on the surface of the movable rail, and the baffle 17 covers the surface of the movable rail.

Referring to fig. 1, the notebook computer clamping device 1 can clamp a notebook computer between a first clamping plate 11 and a second clamping plate 12 of the clamping device, and ensures the stability and safety of the notebook computer through the acting forces of a clamping strip 14 and a spring 15. The notebook computer clamping device 1 can be used in various occasions, such as offices, schools, coffee shops and other public places, a user can put a notebook computer on a desktop, and the notebook computer is fixed at a proper position through the clamping device so as to be convenient to use. In addition, in a home environment, a user may also use the notebook computer holding device 1 to fix a notebook computer on furniture such as a table or a bedside table, so as to perform entertainment or work.

Referring to fig. 1-2, a plurality of clamping claws 13 are disposed at the sides of the first clamping plate 11 and the second clamping plate 12, which are mainly used for increasing the clamping force and stability of the clamping device on the notebook computer. These holding claws 13 can be tightly attached to the housing of the notebook computer, and fix the notebook computer in the holding device by clamping and fixing, preventing the notebook computer from sliding or shaking during use, thereby improving the stability and reliability of the whole display expansion device. In addition, the number and the positions of the clamping claws 13 can be adjusted according to actual needs so as to adapt to notebook computers of different brands and models. The design of the clamping claw 13 can also adopt different shapes and materials so as to ensure that the contact area between the clamping device and the notebook computer is larger, the clamping force is stronger, and meanwhile, the notebook computer cannot be damaged.

Meanwhile, the two sides of the internal notebook clamping device 1 are provided with the detachable expansion screens 2, and a user can add one or more screens on the two sides of the display expansion device so as to enlarge the display area and improve the working efficiency and the comfort level. These extension screens 2 can be installed and adjusted according to the needs and preferences of the user, supporting different resolutions and display modes.

Providing stable support and balance for the notebook clamping device 1 to ensure that the clamping device is securely fastened to the work surface without rocking or sliding. The design can provide a more stable and reliable working environment for users, and simultaneously can reduce the damage risk to the notebook computer caused by accidental collision or vibration.

While the presence of the shutter 17 prevents excessive movement or displacement of the gripping bar 14 within the mobile track. The shutter 17 prevents the clip strip 14 from being separated from the rail or sliding by being covered on the surface of the movable rail. The design can provide a more stable and reliable clamping effect for users and protect the notebook computer from accidental collision or vibration.

Referring to fig. 6, in this embodiment, the surface of the second clamping plate 12 is provided with movable rails above and below, respectively, and each movable rail includes an initial rail 120 and a stable rail 121 connected in sequence, wherein the initial rail 120 is close to the outer side of the second clamping plate 12, and the width of the initial rail 120 is larger than the width of the clamping strip 14, so that the clamping strip 14 can be assembled conveniently at the beginning, and the width of the stable rail 121 is equal to the clamping strip 14, and the width of the initial rail 120 close to the end of the stable rail 121 gradually decreases, and the width thereof decreases to be consistent with the width of the stable rail 121. That is, after the clamping bar 14 is installed in the initial rail 120, the end with the decreasing width can facilitate the clamping bar 14 to be installed in the stable rail 121, so as to ensure the stability of the clamping bar 14 during the movement. This design effectively avoids excessive movement or deflection of the clamping bar 14 within the movable track while ensuring stability of the clamping bar 14 within the stabilizing track 121. The clamping device can be suitable for notebook computers with different sizes and shapes, and provides more convenient and reliable use experience for users.

The expansion screens 2 on the other two sides are powered by a built-in power supply of the notebook, and are connected with the expansion screens 2 through a Type-C interface of the notebook and powered. Meanwhile, HDMI interfaces are arranged on the expansion screen 2, and when the notebook computer supports multi-interface output, multi-screen interaction can be realized by connecting the notebook computer with the corresponding HDMI interfaces through connecting wires.

Referring to fig. 3-4, wherein one side of each of the first clamping plate 11 and the second clamping plate 12 is provided with a fitting notch 16, wherein the extension screen 2 is fitted at the fitting notch 16 by the hinge 3 and is hinged, wherein two side walls of the fitting notch 16 are provided with fitting ribs 161 extending along the notch direction, and two side walls of the fitting notch 16 are further provided with elastic limiting devices 162 located at the end positions of the fitting ribs 161; the hinge 3 includes a first hinge plate 31 and a second hinge plate 32 hinged to the first hinge plate 31, wherein two sides of the first hinge plate 31 are provided with a fitting bar-shaped groove 311 and a limiting hole 312 corresponding to the fitting bar 161, wherein the first hinge plate 31 is matched with the fitting bar-shaped groove 311 through the fitting bar-shaped groove 161, and the limiting hole 312 is matched with the elastic limiting device 162 to further realize the fitting with the fitting notch 16.

In this technical solution, the design of the hinge 3 is a very critical part, which can realize the hinged connection and the detachable connection between the extension screen 2 and the notebook clamping device 1, and through the arrangement of the limiting hole site 312 and the elastic limiting device 162, the firm connection between the hinge 3 and the fitting notch 16 is ensured, and the extension screen 2 is prevented from falling off or loosening in the use process. In addition, the design of the assembling notch 16 is also very practical, and the assembling process of the expansion screen 2 and the notebook clamping device 1 can be simpler and more stable through the assembling convex line 161 extending along the notch direction and the elastic limiting device 162 positioned at the tail end of the convex line. The fitting slit 16 is provided with fitting ribs 161 extending in the slit direction on both side walls thereof, and can be fitted with fitting bar-shaped grooves 311, thereby enhancing the firmness during fitting.

Referring to FIG. 7, the end of the fitting bar-shaped groove 311 of the first hinge plate 31 is further connected with a trumpet-shaped opening inlet 313, i.e. the width of the trumpet-shaped opening inlet 313 increases in a direction away from the fitting bar-shaped groove 311. This flared open inlet 313 design can easily guide the fitting of the extension screen 2 and make the fitting process smoother, reducing possible misfittings. During the assembly process, when the first hinge plate 31 of the hinge member 3 of the extension screen 2 is aligned with and inserted into the assembly notch 16 of the first clamping plate 11 or the second clamping plate 12, the trumpet-shaped open entrance 313 guides the hinge member 3 of the extension screen 2 to automatically align with and insert into the assembly notch 16, thereby improving assembly efficiency and accuracy and reducing the possibility of jamming or blocking during assembly.

The tail end of the first hinge plate 31 is further provided with a hinge bayonet, the second hinge plate 32 is clamped in the hinge bayonet, the second hinge plate 32 is movably assembled in the hinge bayonet through the hinge bayonet and the second hinge plate 32 by the first damping rotating shaft, the surface of the second hinge plate 32 is further provided with a second damping rotating shaft 33, and the second damping rotating shaft 33 is movably connected with the expansion screen 2.

The second damping rotating shaft 33 is used for connecting the expansion screen 2 and simultaneously enabling the expansion screen 2 to have a rotating effect. The first damping shaft serves to increase resistance so that the hinging process is smoother, avoiding damage to the hinge 3 and the extension screen 2 due to excessive loosening or tightening. The design of the entire hinge 3 can effectively improve the stability and reliability of the use of the extension screen 2.

Referring to fig. 10, the extension screen 2 can be hinged with the notebook holder 1 and folded by the design of the hinge 3. When the extension screen 2 needs to be folded, the extension screen can be folded on the front or back of the notebook clamping device 1, so that the extension screen is convenient to carry and store. When the extension screen 2 is required to be used, it can be unfolded and used in cooperation with the notebook clamping device 1.

Referring to fig. 9, a supporting leg receiving slot is formed on the back of the first clamping plate 11 or the second clamping plate 12, the telescopic supporting leg 4 includes an outer supporting leg cylinder 41 and a supporting leg sliding block 42 movably disposed inside the outer supporting leg cylinder 41, wherein a limiting tooth 421 extending along the length direction of the supporting leg sliding block 42 is disposed on the surface of the supporting leg sliding block 42, an elastic limiting tooth 45 is movably disposed in the outer supporting leg cylinder 41 through a spring 15, and the elastic limiting tooth 45 is further connected with an unlocking button 44, and the unlocking button extends out of the outer supporting leg cylinder 41, wherein the elastic limiting tooth 45 is separated from the limiting tooth 421 by pressing the unlocking button. When the unlocking button 44 is pressed, the elastic limit tooth claw 45 releases the limit tooth 421, so that the telescopic support leg 4 can be telescopically adjusted. After the unlocking button 44 is released, the elastic limiting tooth claw 45 clamps the limiting tooth 421 under the force of the spring 15, so that the telescopic support leg 4 is kept stable.

Wherein the hinge between the outer leg cylinder 41 and the leg receiving groove is achieved by the third damping rotation shaft 43 passing through the upper end of the leg cylinder and the leg receiving groove. When in use, a user can take out the telescopic supporting leg 4 from the supporting leg accommodating groove, and separate the elastic limiting tooth claw 45 from the limiting tooth 421 through the unlocking button 44, so as to stretch and adjust the elastic limiting tooth claw to the required length; the third damping rotating shaft 43 is arranged to provide damping force when the angle of the supporting leg is adjusted, so that the telescopic supporting leg 4 can be adjusted stably, and the conditions of violent vibration, unstable telescopic motion and the like in the adjusting process are avoided. When the user does not need to use the supporting legs, the supporting legs can be retracted and stored in the storage groove, so that the space is saved and the carrying is convenient.

In addition, a relief groove 122 is further formed at the end of the support leg accommodating groove, so that a user can conveniently buckle out the telescopic support leg 4 from the support leg accommodating groove. The angle of the support leg can be adjusted more conveniently, and the support leg can be taken out more easily when the support leg needs to be detached.

Wherein the surfaces of the first clamping plate 11 and the second clamping plate 12 are respectively provided with an installation cover plate, and the surfaces of the installation cover plates are respectively attached with an insulating plastic film. Further, the insulating plastic film is a MYLAR polyester film. The insulating plastic film can avoid the problems of short circuit, electric interference and the like caused by metal conduction. Meanwhile, the friction force of the contact surface can be increased by using the insulating plastic film, the friction force between the first clamping plate 11 and the second clamping plate 12 and the notebook computer is improved, and the notebook computer is prevented from sliding off or loosening.

The above embodiments are merely illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the design of the present utility model.

Claims (10)

1. A display expansion device, characterized by: the notebook computer clamping device comprises a notebook computer clamping device and an expansion screen which is detachable and hinged with two sides of the notebook computer clamping device, wherein the back surface of the notebook computer clamping device is also movably provided with a telescopic supporting leg, the notebook computer clamping device comprises a first clamping plate, a second clamping plate, a clamping strip and a spring, one end of the clamping strip is fixed on the first clamping plate, the spring is fixed on the second clamping plate, and the other end of the clamping strip is connected with the spring; the side edges of the first clamping plate and the second clamping plate are provided with a plurality of clamping claws for clamping the notebook.

2. A display expansion device according to claim 1, characterized in that: the surface of the second clamping plate is provided with a movable rail for the clamping strip to pass through, one end of the clamping strip, which is close to the spring, moves in the movable rail, and the surface of the movable rail is also provided with a baffle plate.

3. A display expansion device according to claim 2, characterized in that: the top and the below on second grip block surface all are provided with movable rail, and every movable rail is including initial track and the firm track that connects gradually, and wherein initial track is close to the outside of second grip block, and initial orbital width is greater than the width of grip block, and firm orbital width equals the grip block, and initial track is close to the terminal width of firm track and gradually decreases simultaneously, and its width is decreased progressively to unanimous with firm track width.

4. A display expansion device according to claim 1, characterized in that: one side of each of the first clamping plate and the second clamping plate is provided with a fitting notch, wherein the expansion screen is fitted at the fitting notch through a hinge piece and is hinged, two side walls of the fitting notch are provided with fitting convex strips extending along the notch direction, and two side walls of the fitting notch are also provided with elastic limiting devices positioned at the tail end positions of the fitting convex strips; the hinge piece comprises a first hinge plate and a second hinge plate hinged with the first hinge plate, wherein the two sides of the first hinge plate are provided with fitting strip-shaped grooves and limiting hole sites, the first hinge plate is fitted into the fitting notch, the fitting strip-shaped grooves are matched with the fitting convex strips, and the limiting hole sites are matched with the elastic limiting device.

5. A display expansion device according to claim 4, wherein: the tail end of the fitting strip-shaped groove of the first hinge plate is also communicated with a trumpet-shaped open inlet, and the width of the trumpet-shaped open inlet increases gradually in the direction away from the fitting strip-shaped groove.

6. A display expansion device according to claim 4, wherein: the tail end of the first hinge plate is further provided with a hinge bayonet, and the second hinge plate is movably assembled at the hinge bayonet through the hinge bayonet and the second hinge plate by the first damping rotating shaft, the surface of the second hinge plate is further provided with a second damping rotating shaft, and the second damping rotating shaft is movably connected with the expansion screen.

7. A display expansion device according to claim 6, wherein: the back of the first clamping plate or the second clamping plate is provided with a supporting leg accommodating groove, the telescopic supporting leg comprises an outer supporting leg cylinder and a supporting leg sliding block movably arranged in the outer supporting leg cylinder, and the outer supporting leg cylinder and the supporting leg accommodating groove are hinged through a third damping rotating shaft penetrating through the upper end of the supporting leg cylinder and the supporting leg accommodating groove; the surface of the supporting leg sliding block is provided with limiting teeth extending along the length direction of the supporting leg sliding block, an elastic limiting tooth claw is movably arranged in the outer supporting leg cylinder through a spring, the elastic limiting tooth claw is further connected with an unlocking button, the unlocking button extends out of the outer supporting leg cylinder, and the elastic limiting tooth claw is separated from the limiting tooth by pressing the unlocking button.

8. A display expansion device according to claim 7, wherein: the tail end of the supporting leg storage groove, which is close to the supporting leg sliding block, is also provided with a yielding groove.

9. A display expansion device according to claim 1, characterized in that: the surfaces of the first clamping plate and the second clamping plate are respectively provided with an installation cover plate, and the surfaces of the installation cover plates are respectively attached with an insulating plastic film.

10. A display expansion device according to claim 9, wherein: the insulating plastic film is MYLAR polyester film.