CN111506279A

CN111506279A - Display device

Info

Publication number: CN111506279A
Application number: CN201910094163.3A
Authority: CN
Inventors: 刘自银; 郭景昊; 张夏杰; 陈宇; 刘巍; 乌日尼; 安山; 姜博
Original assignee: Beijing Wodong Tianjun Information Technology Co Ltd
Current assignee: Beijing Wodong Tianjun Information Technology Co Ltd
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2020-08-07

Abstract

The invention discloses a display device, which is characterized by comprising: mounting a shell; the display screen is connected with the control assembly, and pictures can be stored in the control assembly; the control component can display a piece of appointed picture stored in the control component on the display screen according to an externally input picture issuing instruction. The display device has low cost, high response speed and easy size adjustment.

Description

Display device

Technical Field

The present invention generally relates to a display device.

Background

In a digital retail scenario, information of a commodity needs to be displayed. For example, when placing goods on a shelf, a display device is needed to display the goods information such as price, name, producing area, etc. of the product instead of the traditional price tag, and the display device can also display color pictures and videos for pushing advertisements; meanwhile, a display area of the display device needs to be divided into a plurality of sub-display areas independent of each other, and each sub-display area displays commodity information of a commodity.

In the prior art, a whole large display panel or a strip-shaped display panel is usually used as a display screen of the display device. Then, one main control board controls the content displayed by the display screen, so that the display screen is virtually divided into a plurality of sub-display areas, and the commodity information displayed by each sub-display area is mutually independent. However, such a display device has the following disadvantages:

1) the display panel is not universal, only a few large factories with large-sized display panels can produce the display panel, and the cost is high;

2) the size and specification of the display panel are limited, the applicability is narrow, and flexible design is not facilitated;

3) the performance requirement of the main control board is high, and the cost is high;

4) the method is not suitable for the scene requirements of large batch and sensitive cost;

the above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

It is a primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art, and to provide a display device including: mounting a shell; the display screen is connected with the control assembly, and pictures can be stored in the control assembly; the control component can display a piece of appointed picture stored in the control component on the display screen according to an externally input picture issuing instruction.

According to one embodiment of the present invention, the control assembly includes a circuit board, a memory mounted on the circuit board, a processor mounted on the circuit board, and a DMA controller embedded in the processor; the DMA controller is used for transmitting the pictures stored in the memory to the display screen for display.

According to an embodiment of the present invention, the display device further includes a bus connected to each of the control components, through which the control components communicate with the outside, and a power line through which the control components supply power.

According to one embodiment of the invention, the bus is a serial bus.

According to one embodiment of the present invention, the control assembly further includes a wireless communication module through which the control assembly communicates with the outside.

According to an embodiment of the invention, the display can continuously switch a plurality of pictures recorded with continuous video pictures on the display screen when a plurality of picture issuing instructions are continuously received so as to present dynamic pictures on the display.

According to one embodiment of the invention, each display is pre-assigned a unique private address, and all displays are also pre-assigned a common public address; the instructions which can be received by the display comprise address codes and operation instruction codes; the address code is used for indicating an object to which the instruction is directed, and after the display receives the instruction, the display acts according to the operation instruction code of the instruction only when one of the private address and the public address is matched with the address code of the instruction; the operation instruction code is used to express the contents of the instruction.

According to one embodiment of the invention, the operation instruction code comprises one or more of a status query code, a private address query code, a picture publishing code and a content updating code; the state inquiry code is used for inquiring the state of the display; the private address inquiry code is used for inquiring the private address of the display; the picture publishing code is used for designating a picture stored by the display and displaying the picture on a display screen of the display; a content update code for updating the picture stored in the memory.

According to one embodiment of the invention, the mounting shell is constructed in a straight-bar rectangular box structure, and one surface of the rectangular box is provided with a plurality of light-transmitting windows which are sequentially arranged along the extending direction of the rectangular box; the display screen is arranged on the mounting shell, the display screens are arranged in the mounting shell and correspond to the light-transmitting windows one by one, and the display screen of each display screen covers one light-transmitting window corresponding to the display screen.

According to one embodiment of the invention, a sliding groove is arranged on the mounting shell; each line in the power line and the bus is arranged on the inner wall of the sliding groove in a metal strip mode, and the extending direction of each line is parallel to the extending direction of the sliding groove; the display also comprises a shell used for accommodating the display screen and the control component, and the shell is arranged in the sliding groove and can slide along the sliding groove; the shell is provided with a plurality of conductive bulges which are electrically connected with the control component, the conductive bulges are arranged in one-to-one correspondence with the power line and each line of the bus, and each conductive bulge is abutted against the corresponding line.

According to one embodiment of the invention, each of the lines is disposed on the bottom wall of the chute, and the two lines of the power line are disposed on both sides of the bus bar.

According to one embodiment of the invention, the display screen is an L CD screen or a L ED screen.

According to one embodiment of the invention, the display device is used for displaying commodity information of commodities on the shelf.

According to the technical scheme, the display device has the advantages and positive effects that:

the single screen in the display device is small, the standardized screen produced in large batch can be adopted, and the price of the standardized screen is extremely low, so that the screen cost of the display device is greatly reduced. Meanwhile, in order to match with shelves with different widths, screens with different sizes are not required to be customized, and the number of displays in the display device and the length of the mounting shell are only required to be adjusted according to the width of the shelves, so that the size adjustment is more flexible. Especially, pictures are prestored in each display, and the pictures are sent to the display screen to be refreshed and displayed through remote control, so that the control assembly only needs to send the pictures to the display screen to be displayed according to the picture issuing instruction sent remotely, the hardware requirement on the control assembly is greatly reduced, and the cost of the control assembly is reduced. In addition, when the display receives a picture issuing instruction sent remotely, the picture is stored in the local memory, so that the speed is higher when the picture is read from the memory and transmitted to the display for displaying, and the response speed of the whole display device is improved.

Drawings

Various objects, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

FIG. 1 is a schematic perspective view of a shelf-mounted display device according to an embodiment;

FIG. 2 is a schematic side view of a shelf-mounted display device according to an embodiment;

FIG. 3 is a schematic perspective view of a front side of a display device according to an embodiment;

FIG. 4 is a schematic perspective view of the rear of a display device according to an embodiment;

FIG. 5 is a schematic diagram illustrating an internal structure of a display device according to an embodiment;

FIG. 6 is a schematic perspective view of a display device according to the second embodiment;

FIG. 7 is a schematic front view of a display device according to the second embodiment;

FIG. 8 is a schematic perspective view of a display according to the second embodiment;

FIG. 9 is a schematic side view of a display according to the second embodiment;

fig. 10 is a schematic rear view of a display according to the second embodiment.

Wherein the reference numerals are as follows:

1. a display device; 11. mounting a shell; 111. a front housing; 112. a light-transmitting window; 113. a rear cover; 114. an external interface; 115. a screw hole; 12. a display; 120. a control component; 121. a display screen; 122. a circuit board; 123. a memory; 124. a processor; 125. a parallel interface; 13. a bus; 14. a power line; 21. a column; 22. a storage plate; 23. a partition plate; 3. an external control device;

1a, a display device; 11a, a mounting shell; 111a, a chute; 112a, end caps; 12a, a display; 121a, a display screen; 122a, a shell; 123a, a transparent window; 13a, a bus; 131a, a first signal line; 132a, a second signal line; 14a, a power line; 141a, a positive electrode line; 142a, ground.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Example one

Fig. 1 and 2 show a display device 1 mounted on a shelf 2 in the present embodiment. The display device 1 can display commodity information of commodities placed on the shelf 2, and the commodity information may include information such as commodity names, commodity prices, and commodity origins. The display device 1 is also capable of distributing advertising information such as promotional programs.

The shelf 2 comprises a plurality of storage plates 22, two upright posts 21 and a partition plate 23. The partition 23 is a rectangular plate, and the partition 23 is vertically disposed. The two upright posts 21 are respectively arranged at two opposite sides of the partition plate 23 and fixedly connected with the partition plate 23. The object placing plate 22 may be a rectangular plate and is horizontally disposed. The plurality of object placing plates 22 are arranged in sequence from top to bottom. The object placing plate 22 is installed on the vertical column 21, and the vertical column 21 supports the object placing plates 22. The storage plate 22 carries merchandise. The display device 1 is attached to one end of the storage plate 22 away from the partition plate 23, and can display commodity information of various commodities carried on the storage plate 22.

Referring to fig. 3, 4 and 5, the display device 1 includes a mounting case 11, a plurality of displays 12, a bus 13 and a power supply line 14. The mounting shell 11 is used for being fixedly connected with the goods shelf 2, and the displays 12 are all mounted on the mounting shell 11. A bus 13 is electrically connected to each display 12 for communication with the external control device 3. A power cord 14 is electrically connected to each display 12 for powering each display 12. Each display device 1 can independently display a screen.

In the present embodiment, the mounting case 11 is configured in a rectangular box structure of a straight bar shape. The mounting case 11 includes a front case and a rear cover. The front shell 111 and the rear cover 113 are both in a strip-shaped structure, and the rear cover 113 covers the front shell 111. The front shell 111 and the rear cover 113 are fixedly connected, and the front shell 111 and the rear cover 113 can be connected by a snap, an adhesive or a screw. A plurality of light-transmissive windows 112 are provided on a side of the front housing 111 facing away from the rear housing, the light-transmissive windows 112 preferably being rectangular light-transmissive windows 112. The plurality of light-transmitting windows 112 are sequentially arranged along the extending direction of the front case 111. The plurality of light-transmissive windows 112 are preferably uniformly distributed on the front case 111. The rear housing is provided with an external interface 114 and a plurality of screw holes 115. A plurality of screw holes 115 may be used for screw connection with the shelf 2.

The display 12 comprises a display screen 121 and a control component 120, the display screen 121 can be an L ED display screen or a L CD display screen (liquid crystal display screen), the display screen 121 is fixed on the front shell 111 and covers the light-transmitting window 112, and the display content of the display screen 121 can be viewed through the light-transmitting window 112, the display screen 121 is electrically connected with the control component 120, the control component 120 comprises a circuit board 122, a memory 123 and a processor 124, the circuit board 122 can be a printed circuit board 122, the memory 123 and the processor 124 are both arranged on the circuit board 122, the processor 124 is a logic unit of the control component 120, the processor 124 is preferably a central processor 124, the memory 123 is a nonvolatile memory 123, preferably a Flash memory 123, a parallel interface 125 is further arranged on the circuit board 122, and the circuit board 122 is electrically connected with the display screen 121 through the parallel interface 125.

Power cord 14 and bus 13 are connected to circuit board 122 of control assembly 120 of each display 12. One end of the power cord 14 and the bus 13 is connected to an external interface 114 of the rear cover 113, and the external interface 114 is used for connecting with the external control device 3. In this embodiment, the external control device 3 is installed at the bottom of the shelf 2, and the external control device 3 is connected to the power line 14 and the bus 13 of the display apparatus 1 through the electric wire inserted into the external interface 114 by a cable. The cable can be routed from the external control device 3 to extend upwards along the surface of the partition 23 of the shelf 2 and finally to extend to the external socket of the display device 1 along the bottom surface of the object placing plate 22. The external control device 3 may be an android box. The external control device 3 supplies power to each display 12 through a power line 14, and also communicates with each display 12 through a bus 13.

The memory 123 of the display 12 stores pictures in advance, and the number of pictures may be plural. These pictures are preferably uncompressed pictures. Some of the pictures are pictures showing commodity information, and some of the pictures are pictures showing advertisement information. The external control device 3 sends a picture issuing instruction to the control component 120 through the bus 13, and the display 12 displays the picture stored in its memory 123 on the display screen 121 as instructed by the picture issuing instruction after receiving the picture issuing instruction. Since each display 12 can store different pictures in advance, when each display 12 receives a picture issuing instruction from the external control device 3, the pictures which are stored and in which different commodity information is recorded are displayed on the respective display screen 121, thereby realizing the function of introducing the commodity information for different commodities.

The single screen in the display device 1 is small, a standardized screen which is produced in a large scale can be adopted, and the price of the standardized screen is extremely low, so that the screen cost of the display device 1 is greatly reduced. Meanwhile, in order to match the shelves 2 with different widths, screens with different sizes are not required to be customized, and the number of the displays 12 in the display device 1 and the length of the mounting shell 11 are only required to be adjusted according to the width of the shelf 2, so that the size adjustment is more flexible. Particularly, by pre-storing pictures in each display 12 and remotely controlling the modes of sending the pictures to the display screen 121 for refresh display, various types of information are displayed, so that the control component 120 only needs to send the pictures to the display screen 121 for display according to the remotely sent picture issuing instruction, the hardware requirements on the control component 120 are greatly reduced, and the cost of the control component 120 is reduced. In addition, when the display 12 receives a picture issuing instruction sent remotely, since the picture is stored in the local memory 123, the speed is faster when the picture is read from the memory 123 and transmitted to the display 12 for display, and the response speed of the whole display device 1 is improved.

Further, the display 12 can successively switch a plurality of pictures on the display screen 121 to present a dynamic picture on the display 12 when a plurality of picture issue instructions are successively received. The display 12 displays a specific picture in the memory 123 on the display 12 every time it receives a picture issuing command, and when a plurality of picture issuing commands are continuously received and played frame by frame on the display screen 121, a moving dynamic picture is formed on the display 12. This is equivalent to achieving the video playing effect without performing video decoding playing, and the control component 120 does not need a video encoding and decoding module, so that the hardware requirement for the display 12 is low, which makes the cost of the whole display device 1 lower. Further, the same consecutive picture issue commands are received periodically to cycle through the pictures stored in the memory 123.

Further, each display 12 is assigned a unique private address in advance, each private address being different from one another. All displays 12 are also assigned a common public address in advance, with each private address also differing from the public address.

The instruction input from the external control apparatus 3 to the display 12 includes an address code, an operation instruction code, and an end check code. The address code is used to indicate the object to which the instruction is directed, i.e. which display 12 is directed. After the display 12 receives the instruction, if any one of the private address and the public address of the display 12 is matched with the address code of the instruction, the display 12 acts according to the instruction; if neither the private address nor the public address of the display 12 matches the address code of the instruction, the display 12 does nothing, ignoring the instruction.

The operation instruction code is used to express the contents of the instruction. An execution program matching with the operation instruction code is prestored in the control unit 120 of the display 12. The operation instruction code comprises one or more of a state inquiry code, a private address inquiry code, a picture publishing code and a content updating code. The status query code is used to query the status of the display 12, the status of the display 12 includes information indicating the status of the display 12, such as total storage capacity, free storage capacity, total resources of the processor 124, free resources of the processor 124, and so on, and the queried status of the display 12 may be displayed on the display screen 121 of the queried display 12. The private address lookup code is used to query the private address of the display 12 so that the private address of the display 12 is displayed on the respective display screen 121. The picture delivery code is used to specify a picture stored in the display 12 and to display the picture on the display screen 121 of the display 12. The content update code is used to update the picture stored in the memory 123.

The end check code is used for checking whether information of the instruction is lost in the transmission process and indicating that the instruction is completely delivered.

The external control device 3 may control a single specific display 12 by sending an instruction containing an address code matching the private address, and the external control device 3 may also control all displays 12 simultaneously by sending an instruction containing an address matching the public address. Thus, the address code and the operation instruction code are matched to enable the external control device 3 to operate a single display 12, for example, to independently operate one display 12 to update stored content, display pictures, inquire private addresses or inquire states; it is also possible to realize that the external control device 3 operates all displays 12 simultaneously, for example operates all displays 12 simultaneously for updating stored content, displaying pictures, querying private addresses or querying status.

Further, the control component 120 further includes a dma (direct Memory access) controller. The DMA controller is a unique peripheral that transfers data within the system and can be viewed as a controller that can connect the internal and external memory 123 to each DMA capable peripheral over a set of dedicated buses 13. The DMA controller may be embedded in the processor 124. The DMA controller is used to transfer the picture stored in the memory 123 directly to the display screen 121 through the parallel interface 125 on the circuit board 122 for display. This eliminates the need for the processor 124 to intervene in the transmission of the picture data, resulting in a faster transmission speed and lower requirements on the processor 124.

Further, the bus 13 of the display device 1 is a serial bus 13. The serial bus 13 has few lines, high transmission speed, low requirement on hardware and high reliability. This further improves the performance of the display device 1 and reduces the overall cost of the display device 1.

It should be understood that the control component 120 may also include a wireless communication module thereon, and communicate with the external control device 3 through the wireless communication module instead of the bus 13. When the external control device 3 is also provided with a wireless communication module, wireless communication can be formed between the wireless communication module of the external control device 3 and the wireless communication module of the control assembly 120, and the instruction issued by the external control device 3 can be transmitted to the display 12 through the wireless communication module.

Example two

The display device 1a in the second embodiment is the same as the display device 1 in the first embodiment in the types of electronic devices, the connection relationship between the electronic devices, and the functions of the electronic devices, and will not be described again. Only the differences will be described below.

Fig. 6 and 7 are schematic structural views of the display device 1a in this embodiment. The display device 1a includes a mounting case 11a, a plurality of displays 12a, a bus 13a, and a power supply line 14 a.

The mounting case 11a is formed in a bar shape, and a slide groove 111a is provided on the mounting case 11 a. The chute 111a narrows at the opening to form a throat. The extending direction of the slide groove 111a is the same as the extending direction of the mounting case 11 a. The mounting case 11a is preferably provided in a bar structure having a C-shaped cross section, and the slide groove 111a is a hollow in the middle of the mounting case 11 a.

Each of the bus line 13a and the power supply line 14a is provided as a metal strip, and is provided on the bottom wall of the chute 111 a. In the present embodiment, the bus 13a is a serial bus 13a, the bus 13a includes a first signal line 131a and a second signal line 132a, the power line 14a is used for supplying direct current, and the power line 14a includes a positive line 141a and a ground line 142 a. The first signal line 131a, the second signal line 132a, the positive line 141a, and the ground line 142a are parallel to each other, and each extend in the extending direction of the slide. The first signal line 131a and the second signal line 132a of the bus line 13a are disposed between the positive line 141a and the ground line 142a, and adjacent two lines do not contact each other. Since the bus line 13a separates the positive line 141a and the ground line 142a of the power supply line 14a from each other, it is difficult to form a short circuit between the positive line 141a and the ground line 142 a. The mounting case 11a may be provided as a metal case with an insulating layer provided between the mounting case 11a and the bus line 13a and the power supply line 14 a.

The bottom of the mounting shell 11a is provided with an external interface. The bus 13a and the power line 14a are electrically connected to an external interface. The external interface is plugged with a cable for connecting the external control equipment 3.

Referring to FIG. 8, display 12a also includes a housing 122 a. The housing 122a has a substantially box-like structure. A transparent window 123a is provided on the front surface of the housing 122 a. The display screen 121a and the control assembly are mounted within the housing 122 a. The screen of the display screen 121a is overlaid on the transparent window 123a, and the content displayed on the display screen 121a can be viewed through the transparent window 123 a.

Referring to fig. 9 and 10, a plurality of conductive bumps 124a are also provided on the back surface of the housing 122 a. The conductive protrusion 124a protrudes from the back surface of the case 122a in a direction away from the transparent window 123 a. The conductive bump 124a has elasticity. The conductive protrusion 124a may be a metal spring protruding from the back of the housing 122 a. Each conductive bump 124a is electrically connected to the circuit board 122 inside the housing 122 a.

The housing 122a of the display 12a is fitted into the slide groove 111a of the mounting case 11a and is slidable along the slide groove 111 a. After the housing 122a is mounted in the sliding chute 111a, the transparent window 123a of the housing 122a faces the opening of the sliding chute 111 a. Two ends of the mounting shell 11a can be respectively provided with two end covers 112a, the end covers 112a can be covered on two ends of the sliding groove 111a, and the end covers 112a and the mounting shell 11a are detachably connected. The cover 112a can prevent the housing 122a from being removed from the sliding groove 111a when the cover is covered on the mounting housing 11 a. After the cover 112a is opened, the housing 122a of the display 12a can enter the sliding groove 111a from a port at one end of the sliding groove 111 a. It is also possible to mount the display 12a already mounted in the slide groove 111a

The number of conductive bumps 124a on the display 12a may be the same as the total number of lines in the bus 13a and the power line 14a, the conductive bumps 124a are arranged in one-to-one correspondence with the respective lines, and each conductive bump 124a abuts against the line corresponding to the conductive bump 124 a. In the embodiment, the number of the conductive bumps 124a is 4, 4 conductive bumps 124a are arranged in a straight line, the two outermost conductive bumps 124a are respectively abutted to the positive line 141a and the ground line 142a, and the two middle conductive bumps 124a are respectively abutted to the first signal line 131a and the second signal line 132 a. Since the extending direction of each line is the same as the sliding direction of the display 12a, the conductive bump 124a can always abut against the corresponding line, so that the display 12a can always conduct the bus line 13a and the power line 14a through the conductive bump 124 a.

Thus, the position of each display 12a can be flexibly adjusted, so that the display 12a can move to the vicinity of the corresponding commodity. At the same time, the number of displays 12a per display device 1a can be flexibly increased or decreased, so that the application range of the display device 1a is wider.

Although the present invention has been disclosed with reference to certain embodiments, numerous variations and modifications may be made to the described embodiments without departing from the scope and ambit of the present invention. It is to be understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the scope of the appended claims and their equivalents.

Claims

1. A display device, comprising:

mounting a shell; and

the display screen is arranged on the mounting shell, and each display comprises a display screen and a control assembly which is connected with the display screen and can store pictures;

the control component can display a piece of appointed picture stored in the control component on the display screen according to an externally input picture issuing instruction.

2. The display device according to claim 1, wherein the control component comprises a circuit board, a memory mounted on the circuit board, a processor mounted on the circuit board, and a DMA controller embedded in the processor;

the DMA controller is used for transmitting the pictures stored in the memory to the display screen for display.

3. The display device according to claim 1, further comprising a bus connected to each of the control components, and a power line, the control components communicating with the outside through the bus, the control components supplying power to the plurality of displays through the power line.

4. The display device according to claim 3, wherein the bus is a serial bus.

5. The display device according to claim 1, wherein the control component further comprises a wireless communication module through which the control component communicates with the outside.

6. The display device according to claim 1, wherein the display device is capable of successively switching a plurality of pictures recorded with successive video pictures on the display screen to present a dynamic picture on the display device when a plurality of the picture issuing instructions are successively received.

7. The display apparatus of claim 1, wherein each display is pre-assigned a unique private address, and all displays are pre-assigned a common public address;

the instructions which can be received by the display comprise address codes and operation instruction codes;

the address code is used for indicating an object to which the instruction is directed, and after the display receives the instruction, the display acts according to the operation instruction code of the instruction only when one of the private address and the public address is matched with the address code of the instruction;

the operation instruction code is used to express the contents of the instruction.

8. The display device according to claim 7, wherein the operation instruction code includes one or more of a status inquiry code, a private address inquiry code, a picture issuing code, and a content updating code;

the state inquiry code is used for inquiring the state of the display;

the private address inquiry code is used for inquiring the private address of the display;

the picture publishing code is used for designating a picture stored by the display and displaying the picture on a display screen of the display;

a content update code for updating the picture stored in the memory.

9. The display device according to claim 1, wherein the mounting case is configured as a rectangular box structure in a straight bar shape, and one surface of the rectangular box is provided with a plurality of light-transmitting windows arranged in sequence along an extending direction of the rectangular box;

the plurality of displays are all installed in the installation shell, the displays and the light-transmitting windows are arranged in a one-to-one correspondence mode, and the display screen of each display covers one light-transmitting window corresponding to the display screen.

10. The display device as claimed in claim 3, wherein the mounting case is provided with a sliding groove;

each line in the power line and the bus is arranged on the inner wall of the sliding groove in a metal strip mode, and the extending direction of each line is parallel to the extending direction of the sliding groove;

the display also comprises a shell used for accommodating the display screen and the control component, and the shell is arranged in the sliding groove and can slide along the sliding groove;

the shell is provided with a plurality of conductive bulges which are electrically connected with the control component, the conductive bulges are arranged in one-to-one correspondence with the power line and each line of the bus, and each conductive bulge is abutted against the corresponding line.

11. The display device according to claim 10, wherein each of the lines is provided on a bottom wall of the chute, and two lines of the power supply line are provided on both sides of the bus line, respectively.

12. A display device as claimed in any one of claims 1 to 11, characterised in that the display screen is an L CD screen or a L ED screen.

13. The display device according to any one of claims 1 to 11, wherein the display device is used for displaying commodity information of commodities on a shelf.