A price display system

Abstract

The present invention provides a price display system, including a power supply device and an electronic price tag electrically connected to the power supply device, wherein the power supply device includes an energy conversion module, and the energy conversion module is used to convert light energy and / or wireless energy in the environment into electrical energy to power the electronic price tag. Through the above-mentioned marking display system, the energy conversion module can be used to continuously convert light energy and / or wireless energy in the environment into electrical energy to power the electronic price tag, thereby avoiding the problem of battery power supply in the prior art requiring special personnel to replace the battery when the battery power is exhausted, and also avoiding the problem of wired power supply in the prior art requiring power supply in the environment and the need to deploy additional leads, thereby improving the stability and flexibility of the use of the electronic price tag and reducing the use cost and maintenance cost of the electronic price tag.

Description

Technical Field

[0001] The present invention relates to the technical field of price labels, and in particular to a price display system. Background Art

[0002] The electronic price tag has the function of changing prices on the screen and communicating wirelessly with the host computer. The price displayed on the electronic price tag can be changed at any time through the host computer. Compared with traditional paper price tags, electronic price tags are extremely flexible, sustainable, and highly reliable.

[0003] However, electronic price tags are active devices that need to be powered by a power source to work properly. There are two main methods used in the existing technology. One is to power them with a battery. This method can make the electronic price tags completely wireless, but the battery itself has limited power and the battery also has self-discharge. Therefore, when the battery is exhausted, it needs to be replaced with a new battery. This process adds additional labor costs and time costs. The other is to power them with a wired power supply. Although this method can ensure that the electronic price tags continue to work, there must be a power source in the environment where the electronic price tags are located. In addition, the wired method will increase the lead deployment cost and limit the flexibility of the electronic price tags.

[0004] Therefore, a technical solution is needed that can solve the disadvantages of the above two methods. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a price display system.

[0006] In one embodiment, the present invention provides a pricing display system, including a power supply device and an electronic price tag electrically connected to the power supply device, wherein the power supply device includes an energy conversion module, which is used to convert light energy and / or wireless energy in the environment into electrical energy to power the electronic price tag.

[0007] In one embodiment, the price display system further includes an assembly structure, and when in use, the electronic price tag is electrically connected to the power supply device via the assembly structure.

[0008] In one embodiment, the assembly structure includes a slide rail and a conductive strip arranged on the slide rail, and the electronic price tag includes a sliding structure corresponding to the slide rail and a conductive part arranged on the sliding structure. When in use, the electronic price tag is slidably connected to the assembly structure through the sliding structure and the slide rail, and the conductive part is in contact with the conductive strip, and the conductive strip is electrically connected to the power supply device.

[0009] In one embodiment, the energy conversion module includes an amorphous silicon solar cell.

[0010] In one embodiment, the power supply device also includes a power supply management module, and the electronic price tag and the energy conversion module are electrically connected through the power supply management module; the power supply management module is used to transform the first electric energy output by the energy conversion module to obtain the first target electric energy, and output the first target electric energy to the electronic price tag.

[0011] In one embodiment, the power supply device also includes a backup power supply electrically connected to the power supply management module; the power supply management module is also used to detect the first electrical energy. When it is detected that the first electrical energy does not meet the preset electrical energy, the second electrical energy output by the backup power supply is transformed to obtain the second target electrical energy, and the second target electrical energy is output to the electronic price tag.

[0012] In one embodiment, the backup power source includes a secondary battery or a supercapacitor.

[0013] In one embodiment, the power supply device also includes a charging management module electrically connected to the energy conversion module, the power supply management module and the backup power supply respectively; the charging management module is used to detect the initial electric energy output by the energy conversion module. If the initial electric energy exceeds the preset electric energy, the initial electric energy is divided into a first electric energy output to the power supply management module and a third electric energy output to the backup power supply.

[0014] In one embodiment, the backup power source is a secondary battery, and the power supply device further includes an external power interface connected to the charging management module, and the external power interface is used to connect external power to activate the secondary battery when the secondary battery is over-discharged.

[0015] In one embodiment, the electronic price tag includes a controller electrically connected to the energy conversion module, a display and a wireless communication module electrically connected to the controller respectively; the wireless communication module is used to receive display information and send it to the controller, the controller is used to generate control instructions according to the display information and send the control instructions to the display, the display is used to display the price according to the control instructions, and the wireless communication module includes an NFC communication module and an RF communication module.

[0016] Through the above-mentioned pricing display system, an energy conversion module is used to continuously convert light energy and / or wireless energy in the environment into electrical energy to power the electronic price tag, thereby avoiding the problem of battery power supply in the prior art that requires special personnel to replace the battery when the battery power is exhausted. It also avoids the problem of wired power supply in the prior art that requires ensuring that there is power in the environment and the need to deploy additional leads, thereby improving the stability and flexibility of the use of electronic price tags and reducing the use cost and maintenance cost of electronic price tags. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] in:

[0019] Figure 1 A schematic diagram of the structure of a price display system in one embodiment of the present invention;

[0020] Figure 2 It is a front schematic diagram of an assembly structure in one embodiment of the present invention;

[0021] Figure 3 A side schematic diagram of an assembly structure in one embodiment of the present invention;

[0022] Figure 4 This is a front view of an electronic price tag according to an embodiment of the present invention;

[0023] Figure 5 A side view of an electronic price tag according to an embodiment of the present invention;

[0024] Figure 6 FIG. 4 is a schematic diagram of the structure of a price display system in another embodiment of the present invention.

[0025] In the above drawings: 1, assembly structure; 11, slide rail; 12, conductive strip; 2, electronic price tag; 21, sliding structure; 22, conductive part. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1As shown, in one embodiment, the present invention provides a pricing display system, including a power supply device and an electronic price tag electrically connected to the power supply device, the power supply device includes an energy conversion module, the energy conversion module is used to convert light energy and / or wireless energy in the environment into electrical energy to power the electronic price tag.

[0029] Among them, the electronic price tag refers to an electronic display device with information receiving and sending functions, which is usually used in supermarkets, convenience stores or drug stores. The number of electronic price tags displayed is controlled by the host computer to realize the digital display of the corresponding product price. Different from the traditional paper price tag, it has the beneficial effect of being more flexible and convenient. The energy conversion module includes a photoelectric conversion module and a radio conversion module, wherein the photoelectric conversion module mainly uses the photoelectric effect or the photochemical effect to directly convert light energy into electrical energy, and the radio conversion module mainly uses electromagnetic induction to receive radio waves in the environment to generate electrical energy, thereby providing a continuous power supply for the electronic price tag. The price display system in this embodiment is mainly based on the photoelectric conversion module, and is mainly used in occasions where there is a stable light source in the environment, such as stable lighting when set indoors, and stable sunlight when set outdoors. Since the energy consumption of the electronic price tag itself is not high, it can also meet the use requirements when the light energy in the environment is weak.

[0030] Through the above-mentioned pricing display system, an energy conversion module is used to continuously convert light energy and / or wireless energy in the environment into electrical energy to power the electronic price tag, thereby avoiding the problem of battery power supply in the prior art that requires special personnel to replace the battery when the battery power is exhausted. It also avoids the problem of wired power supply in the prior art that requires ensuring that there is power in the environment and the need to deploy additional leads, thereby improving the stability and flexibility of the use of electronic price tags and reducing the use cost and maintenance cost of electronic price tags.

[0031] In one embodiment, the price display system further includes an assembly structure, and when in use, the electronic price tag is electrically connected to the power supply device via the assembly structure.

[0032] Among them, the electronic price tag and the power supply device are independent accessories. When they need to be used, you only need to electrically connect the electronic price tag and the power supply device, which is flexible and convenient. The assembly structure can also realize the electrical connection between the electronic price tag and the power supply device and the fixation of the electronic price tag at the same time. For example, the assembly structure is a conductive plug and a conductive socket. The conductive plug and the conductive socket are respectively arranged on the electronic price tag and the power supply device. In this way, when the conductive plug and the conductive socket are matched, both the electrical connection and the fixation are realized. Considering that the weight and volume of the electronic price tag are relatively small, the combination of the conductive plug and the conductive socket can withstand the weight of the electronic price tag and will not fall off easily. Of course, in order to further improve reliability, a buffer rubber pad can also be set on the edge of the conductive plug and / or the conductive socket to ensure the tightness of the connection between the two. Therefore, this method can be adopted to further save volume and cost.

[0033] Of course, in other embodiments, the power supply device may also be integrated inside the electronic price tag, especially for an electronic price tag with a larger display.

[0034] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the assembly structure 1 includes a slide rail 11 and a conductive strip 12 arranged on the slide rail 11, and the electronic price tag 2 includes a sliding structure 21 corresponding to the slide rail 11 and a conductive portion 22 arranged on the sliding structure 21. When in use, the electronic price tag 2 is slidably connected to the assembly structure 1 through the sliding structure 21 and the slide rail 11, and the conductive portion 22 is in contact with the conductive strip 12, and the conductive strip 12 is electrically connected to the power supply device.

[0035] Among them, in this embodiment, the assembly structure 1 is formed with a groove, which serves as the slide rail 11, and correspondingly, the sliding structure 21 is a protrusion; of course, in other embodiments, the assembly structure 1 can also be set as a protrusion and the sliding structure 21 can be set as a groove, which is not limited here.

[0036] In order to enhance the connection stability between the conductive strip 12 and the conductive part 22, a micro spring may be provided on the back of the conductive strip 12 and / or the back of the conductive part 22. The elastic force of the micro spring may be utilized to ensure close contact between the conductive strip 12 and the conductive part 22 during the sliding process, thereby improving stability.

[0037] Among them, when the energy conversion module is a solar panel, the solar panel can be set on the top of the assembly structure 1, and when there are multiple electronic price tags 2, multiple solar panels can be set, and the positions of the solar panels correspond to the electronic price tags 2.

[0038] The electronic price tag 2 is fixed and electrically connected to the power supply device by the above-mentioned slide rail 11 and the slide structure 21. In addition, this method can flexibly increase and decrease the number of electronic price tags 2, which is simple to assemble and improves efficiency. Of course, in other embodiments, other methods can be adopted and reasonably selected according to actual conditions.

[0039] In one embodiment, the energy conversion module includes an amorphous silicon solar cell.

[0040] Among them, photovoltaic power generation basically uses solar cells as the core component of photoelectric conversion, and solar cells can be divided into photoelectric effect solar cells and photochemical effect solar cells according to the principle, and can be divided into silicon solar cells, polycrystalline thin film solar cells, organic polymer solar cells, nanocrystalline solar cells, dye-sensitized solar cells and plastic solar cells according to the material, and each solar cell has its corresponding advantages and disadvantages. Among them, the various performances of silicon solar cells are relatively superior, and silicon solar cells include monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells. Therefore, in this embodiment, amorphous silicon solar cells based on the principle of photoelectric effect are used. Amorphous silicon solar cells have the characteristics of low cost and stable conversion. Although their photoelectric conversion efficiency is weaker than that of monocrystalline silicon solar cells, based on the application scenario in this embodiment, the electric energy required for the electronic price tag is not high, so the use of amorphous silicon solar cells can meet the use requirements of the electronic price tag.

[0041] Through the amorphous silicon solar cell, the cost is further reduced and the stability is improved while ensuring the electric energy required by the electronic price tag.

[0042] like Figure 1 As shown, in one embodiment, the power supply device also includes a power supply management module, and the electronic price tag and the energy conversion module are electrically connected through the power supply management module; the power supply management module is used to transform the first electric energy output by the energy conversion module to obtain the first target electric energy, and output the first target electric energy to the electronic price tag.

[0043] Among them, the voltage of the electric energy generated by the energy conversion module will change with the strength of the light energy and / or wireless energy in the environment. Therefore, when the light energy and / or wireless energy in the environment changes, the voltage of the first electric energy output by the energy conversion module does not meet the working voltage required by the electronic price tag. Moreover, under normal circumstances, the voltage of the electric energy generated by the energy conversion module does not meet the working voltage required by the electronic price tag. Therefore, it is necessary to transform the first electric energy with a changing voltage through the power supply management module to obtain the first target electric energy with a stable voltage that meets the working voltage required by the electronic price tag, thereby ensuring the stable power supply to the electronic price tag and improving the working efficiency of the entire system.

[0044] like Figure 1 As shown, in one embodiment, the power supply device also includes a backup power supply electrically connected to the power supply management module; the power supply management module is also used to detect the first electric energy, and when it is detected that the first electric energy does not meet the preset electric energy, the second electric energy output by the backup power supply is transformed to obtain the second target electric energy, and the second target electric energy is output to the electronic price tag.

[0045] Among them, the backup power supply can also include an energy storage device and an external wired power supply. Of course, in this embodiment, in order to ensure the flexibility and cost of the price display system, an energy storage device is preferably used as a backup power supply. The backup power supply is set to take into account that when the light energy and / or wireless energy in the environment is too weak, and the first electric energy output by the energy conversion module can no longer meet the working requirements of the power supply device, the power supply device can continue to work normally. The power supply management module can detect in real time whether the first electric energy output by the energy conversion module is not less than the preset electric energy. The preset electric energy refers to the minimum electric energy that meets the working requirements of various chips in the power supply device. In this embodiment, it specifically refers to the minimum electric energy that meets the working requirements of various chips in the power supply management module. When it is detected that the first electric energy is less than the preset electric energy, it means that the first electric energy at this time cannot meet the working requirements of the power supply management module, and it is necessary to switch the power supply channel, that is, connect the backup power supply, and transform the second electric energy output by the backup power supply to obtain a second target electric energy with a stable voltage and a working voltage that meets the requirements of the electronic price tag.

[0046] The backup power supply ensures that the electronic price tag can continue to work stably even in adverse conditions such as insufficient ambient light energy and / or insufficient wireless energy, thereby improving work efficiency.

[0047] In one embodiment, the backup power source includes a secondary battery or a supercapacitor.

[0048] Among them, it is mentioned above that in order to ensure the flexibility and cost of the price display system, an energy storage device is preferably used as a backup power source. In this embodiment, the energy storage device may further include a secondary battery or a supercapacitor. A secondary battery refers to a rechargeable battery; a supercapacitor refers to a double-layer capacitor, which has characteristics between ordinary capacitors and batteries, has a large capacity, can be used as a secondary battery, and has the advantages of high power density, short charging and discharging time, long cycle life, and a wide operating temperature range; a secondary battery or a supercapacitor can be used in conjunction with an energy conversion module, and when the light energy and / or wireless energy in the environment is strong, the generated electrical energy can also charge the secondary battery or supercapacitor.

[0049] By using secondary batteries or supercapacitors as backup power sources, they can be used in conjunction with energy conversion modules to maximize the use of electrical energy generated by the energy conversion modules, while also ensuring the flexibility and sustainability of the backup power source.

[0050] like Figure 1As shown, in one embodiment, the power supply device also includes a charging management module electrically connected to the energy conversion module, the power supply management module and the backup power supply respectively; the charging management module is used to detect the initial electric energy output by the energy conversion module. If the initial electric energy exceeds the preset electric energy, the initial electric energy is divided into a first electric energy output to the power supply management module and a third electric energy output to the backup power supply.

[0051] Among them, the charging management module is mainly used to reasonably distribute the initial electric energy output by the energy conversion module. On the basis of ensuring that the first electric energy output to the power supply management module meets the preset electric energy, the third electric energy containing the remaining electric energy is output to the backup power supply, so as to charge the backup power supply such as the secondary battery or super capacitor. Specifically, the charging management module first detects the initial electric energy output by the energy conversion module, and divides the first electric energy and the third electric energy according to the electric energy corresponding to the initial electric energy. For example, if the initial electric energy is A and the preset electric energy is B, then the first electric energy is A and the third electric energy is AB.

[0052] Through the above-mentioned charging management module, the initial electric energy output by the energy conversion module is reasonably distributed to ensure maximum utilization.

[0053] like Figure 1 As shown, in one embodiment, the backup power source is a secondary battery, and the power supply device also includes an external power interface connected to the charging management module, and the external power interface is used to connect external power to activate the secondary battery when the secondary battery is over-discharged.

[0054] Among them, when the secondary battery is over-discharged or the power is too low, it means that the secondary battery cannot work normally and needs to be activated. When there is an external power supply interface, the external power provided by the external power supply can be output to the secondary battery through the charging management module. The external power is high-current power, thereby activating the secondary battery. Of course, it is also possible to provide strong light energy and / or wireless energy to enable the energy conversion module to generate high-current power and output it to the secondary battery, thereby achieving activation.

[0055] In one embodiment, the charging management module also includes a protection circuit and an alarm. The protection circuit is used to perform an emergency stop and issue an alarm message when it detects that the backup power supply such as a secondary battery or supercapacitor has too much power and is overcharged, or too little power and is over-discharged. The alarm then issues an on-site alarm prompt based on the alarm message.

[0056] Among them, the numerical judgment of high battery and overcharge, or low battery and over-discharge can be set according to actual conditions. For example, it can be set to a graded alarm, and different numerical values ​​can be used to determine whether to alarm, general alarm, serious alarm, etc., so that it is convenient for staff to know the current status in time; the alarm includes an acoustic alarm and / or a light alarm. For graded alarms, the acoustic alarm can be achieved by emitting sounds of different loudness or different frequencies, while the light alarm can be achieved by emitting lights of different colors.

[0057] Through the above-mentioned protection circuit and alarm, the charging and discharging status of the backup power supply can be monitored in real time, and timely stop and alarm prompts can be made under specified circumstances, thereby ensuring the safety of the backup power supply and enabling the system to be handled by the corresponding staff in a timely manner, thereby improving the overall reliability of the system.

[0058] like Figure 1 As shown, in one embodiment, the electronic price tag includes a controller electrically connected to the energy conversion module, a display and a wireless communication module electrically connected to the controller respectively; the wireless communication module is used to receive display information and send it to the controller, the controller is used to generate control instructions according to the display information and send the control instructions to the display, and the display is used to display the price according to the control instructions.

[0059] Among them, in this embodiment, the display and the wireless communication module are connected through the controller and the energy conversion module, so the power supply of the display and the wireless communication module is distributed by the controller, and of course in other embodiments, it can also be through other methods. The wireless communication module mainly receives the display information sent by the host computer, and of course it can also receive the display information sent by the mobile terminal, and the specific composition of the wireless communication module is flexibly configured according to the actual scene. The display includes an integrated flexible display screen and a flexible display driving module. The flexible display screen can be composed of OLED (Organic Light-Emitting Diode), and the flexible display driving module is composed of multiple flexible driving chips, which are used to drive the corresponding OLED to emit light according to the control instructions; of course in other embodiments, the flexible display screen can also be an ink display screen.

[0060] Through the flexible display screen and flexible display driver module, the full flexibility of the electronic price tag display is achieved, which improves the flexibility of display deployment and reduces the space requirements for deployment.

[0061] like Figure 1 As shown, in one embodiment, the wireless communication module includes an NFC communication module and an RF communication module.

[0062] Among them, the RF (Radio Frequency) communication module is mainly used for remote communication with the host computer. The communication distance of the RF communication module is relatively long. In this embodiment, it is configured to batch process the displayed prices of multiple electronic price tags on the host computer (such as Figure 4 As shown, the figure shows multiple electronic price tags, and the multiple electronic price tags are electrically connected to a power supply device. Of course, in order to improve stability, each electronic price tag can also be equipped with a power supply device); and the NFC (Near Field Communication, short-range wireless communication technology) communication module is a near-field communication, and the communication distance is generally less than 10 meters. Of course, a specific communication distance is set within the maximum communication distance of the NFC communication module, such as 1 meter, 1 decimeter or 1 centimeter, etc., and can be set accordingly according to actual needs. In this embodiment, the NFC communication module is mainly used for on-site personnel to adjust individual electronic price tags through mobile terminals, so the communication distance is set to 0.1-10 cm, preferably 1 cm. The setting of the communication distance can not only ensure the convenience of personnel adjustment, but also avoid interference from other signals, thereby ensuring safety.

[0063] Among them, when the backup power supply is a secondary battery and the power is too low or over-discharged, the NFC communication module is electrically connected to the charging management module, and near-field electromagnetic induction can be performed through the NFC communication module to obtain high-current electrical energy, thereby activating the secondary battery.

[0064] Through the specific settings of the above-mentioned wireless communication module, the RF communication module and the NFC communication module are configured accordingly according to the actual situation, which can not only realize remote batch adjustment of multiple electronic price tags, but also realize personalized adjustment of individual electronic price tags on site. The adjustment means are flexible and the work efficiency of the system is improved.

[0065] Through the above-mentioned pricing display system, energy conversion modules, charging management modules, backup power sources such as secondary batteries or supercapacitors, power supply management modules, and communication modules such as RF communication modules and NFC communication modules are integrated, so that the pricing display system is completely wireless and can work stably for a long time. Specifically, efficient management of electric energy conversion, charging, storage, and power supply is achieved, and basically no parts replacement and maintenance are required, which improves the overall efficiency of the system and reduces the overall cost.

[0066] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A price display system, comprising a power supply device and an electronic price tag electrically connected to the power supply device, characterized in that: The power supply device comprises an energy conversion module, and the energy conversion module is used to convert light energy and / or wireless energy in the environment into electrical energy to supply power to the electronic price tag; The power supply device also includes: a power supply management module and a backup power supply; The power supply device further includes a charging management module electrically connected to the energy conversion module, the power supply management module and the backup power supply respectively; the charging management module is used to detect the initial electric energy output by the energy conversion module, and if the initial electric energy exceeds the preset electric energy, the initial electric energy is divided into a first electric energy output to the power supply management module and a third electric energy output to the backup power supply; and further includes an assembly structure, through which the electronic price tag is electrically connected to the power supply device when in use; the electronic price tag and the power supply device are independent accessories respectively; The charging management module also includes a protection circuit and an alarm. The protection circuit is used to perform an emergency stop and issue an alarm message when it detects that the backup power source such as a secondary battery or super capacitor has too high power and is overcharged, or too low power and is over-discharged. The alarm then issues an on-site alarm prompt based on the alarm message. The assembly structure includes a slide rail and a conductive strip arranged on the slide rail, the electronic price tag includes a sliding structure corresponding to the slide rail and a conductive part arranged on the sliding structure, when in use, the electronic price tag is slidably connected to the assembly structure through the sliding structure and the slide rail, and the conductive part is in contact with the conductive strip, and the conductive strip is electrically connected to the power supply device; a groove is formed on the assembly structure, and the groove serves as the slide rail; the sliding structure is a protrusion and corresponds to the groove; The backup power supply includes a secondary battery or a supercapacitor; the electronic price tag also includes an NFC communication module; When the backup power source is a secondary battery and the battery power is too low or over-discharged, the NFC communication module is electrically connected to the charging management module, and near-field electromagnetic induction is performed through the NFC communication module to obtain high-current electrical energy to activate the secondary battery.

2. The price display system according to claim 1, characterized in that: The energy conversion module includes an amorphous silicon solar cell.

3. The price display system according to claim 1, characterized in that: The electronic price tag and the energy conversion module are electrically connected via the power supply management module; the power supply management module is used to transform the first electric energy output by the energy conversion module to obtain the first target electric energy, and output the first target electric energy to the electronic price tag.

4. The price display system according to claim 3, characterized in that: The power supply management module is also used to detect the first electric energy. When it is detected that the first electric energy does not meet the preset electric energy, the second electric energy output by the backup power supply is transformed to obtain the second target electric energy, and the second target electric energy is output to the electronic price tag.

5. The price display system according to claim 1, characterized in that: When the backup power source is a secondary battery, the power supply device further comprises an external power interface connected to the charging management module, and the external power interface is used to connect external power to activate the secondary battery when the secondary battery is over-discharged.

6. The price display system according to claim 1, characterized in that: The electronic price tag includes a controller electrically connected to the energy conversion module, a display and a wireless communication module electrically connected to the controller respectively; the wireless communication module is used to receive display information and send it to the controller, the controller is used to generate a control instruction according to the display information and send the control instruction to the display, the display is used to display the price according to the control instruction, and the wireless communication module includes an NFC communication module and an RF communication module.

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