CN116405067A - Passive NFC chip, control method thereof and passive NFC display device - Google Patents

Abstract

The application provides a passive NFC chip, a control method thereof and a passive NFC display device, wherein the passive NFC chip comprises: the conversion circuit is used for being matched with the antenna to convert the wireless signals in the space into electric energy; an energy management circuit electrically connected to the conversion circuit to store and manage electrical energy; the display driving circuit is electrically connected with the energy management circuit to drive the electronic paper outside the passive NFC chip when the energy management circuit supplies power; and the processor is respectively and electrically connected with the energy management circuit and the display driving circuit, and when the voltage of the energy management circuit reaches the set voltage, the processor controls the energy management circuit to be communicated with the display driving circuit and transmits display data to the electronic paper so as to control the display of the electronic paper. By integrating the display driving circuit into the passive NFC chip, the integration level of the passive NFC chip can be improved, and the occupied space of the display driving circuit can be reduced, so that the whole size of the passive NFC display device is reduced.

Description

Passive NFC chip, control method thereof, and passive NFC display device

technical field

The present application belongs to the technical field of passive systems, and in particular relates to a passive NFC chip, a control method thereof, and a passive NFC display device.

Background technique

Passive NFC devices, such as passive NFC locks, passive NFC display devices, etc., have gradually entered the field of vision of consumers due to the advantage of not requiring power supply. Among them, the passive NFC display device is a display device without power supply, relying on its external antenna signal to radiate energy, and converting the wireless signal into electrical energy, which is used by the passive NFC display device to display.

Among them, the passive NFC display device usually includes a passive NFC chip and electronic paper, the passive NFC chip realizes the acquisition, storage and supply of electric energy, and the electronic paper is used to receive electric energy and control signals to realize the display of preset content. However, when the passive NFC chip cooperates with the electronic paper outside the chip, it is necessary to set up a circuit that cooperates with the passive NFC chip and the electronic paper, and the space utilization rate decreases.

Contents of the invention

The embodiment of the present application provides a passive NFC chip and its control method, and a passive NFC display device. By integrating the display driving circuit that cooperates with the passive NFC chip and electronic paper into the passive NFC chip, the number of display driving circuits can be reduced. Occupying less space, improving the integration level of the passive NFC chip, and helping to reduce the overall volume of the passive NFC display device.

The embodiment of the present application provides a passive NFC chip, including:

The conversion circuit is used to cooperate with the antenna to convert the wireless signal in the space into electric energy;

an energy management circuit electrically connected to the conversion circuit to store and manage the electrical energy;

A display drive circuit, electrically connected to the energy management circuit, to drive the electronic paper outside the passive NFC chip when the energy management circuit supplies power;

a processor, electrically connected to the energy management circuit and the display drive circuit respectively, and when the voltage of the energy management circuit reaches a set voltage, the processor controls the energy management circuit to communicate with the display drive circuit, and transmitting the display data to the electronic paper to control the display of the electronic paper.

Optionally, the processor controls to supply power to the electronic paper, and after a preset time delay, the processor controls to send the display data to the electronic paper.

Optionally, the processor controls to supply power to the electronic paper, synchronously acquires a feedback signal of the electronic paper, and when the processor receives the feedback signal of the electronic paper, controls to send the display data to the described electronic paper.

Optionally, when the power of the energy management circuit is greater than or equal to a preset power, the processor controls to refresh all the electronic paper;

When the power of the energy management circuit is less than the preset power, the processor controls to perform a partial refresh process on the electronic paper.

Optionally, the passive NFC chip is provided with:

A power supply interface, used to connect to the power receiving port of the electronic paper, so as to supply power to the electronic paper;

The data interface is used to connect to the data receiving port of the electronic paper, so as to provide display data for the electronic paper.

The embodiment of the present application also provides a passive NFC display device, including:

A passive NFC chip as described in any one of the preceding items; and

The electronic paper is electrically connected with the passive NFC chip, so as to be displayed under the control of the passive NFC chip.

The embodiment of the present application also provides a control method of a passive NFC chip, including:

Convert wireless signals in the space into electrical energy, store and manage the electrical energy;

When the voltage of the electric energy reaches a set voltage, the electronic paper is driven, and the display data is transmitted to the electronic paper, so as to control the display of the electronic paper.

Optionally, when the voltage of the electric energy reaches a set voltage, driving the electronic paper and transmitting display data to the electronic paper to control the display of the electronic paper includes:

powering the electronic paper;

After delaying for a preset period of time, sending the display data to the electronic paper.

Optionally, when the voltage of the electric energy reaches a set voltage, driving the electronic paper and transmitting display data to the electronic paper to control the display of the electronic paper further includes:

supplying power to the electronic paper, and synchronously obtaining a feedback signal of the electronic paper;

When the feedback signal of the electronic paper is received, the display data is sent to the electronic paper.

Optionally, the control method also includes:

Get the stored power;

If the electric quantity is greater than or equal to the preset electric quantity, performing all refresh processing on the electronic paper;

If the electric quantity is less than the preset electric quantity, a partial refresh process is performed on the electronic paper.

In the passive NFC chip and its control method and passive NFC display device provided in the embodiments of the present application, by integrating the display drive circuit that works with the passive NFC chip and electronic paper into the passive NFC chip, the passive NFC chip can be improved. The integration of the NFC chip can reduce the occupied space of the display driving circuit, thereby helping to reduce the overall size of the passive NFC display device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings that need to be used in the description of the embodiments. Apparently, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

For a more complete understanding of the present application and its beneficial effects, the following will be described in conjunction with the accompanying drawings. Wherein, the same reference numerals denote the same parts in the following description.

FIG. 1 is a schematic structural diagram of a passive NFC display device provided by an embodiment of the present application.

FIG. 2 is a schematic diagram of a first structure of a passive NFC chip provided by an embodiment of the present application.

FIG. 3 is a schematic diagram of a second structure of a passive NFC chip provided by an embodiment of the present application.

FIG. 4 is a schematic structural diagram of an energy management circuit provided by an embodiment of the present application.

FIG. 5 is a schematic structural diagram of a passive NFC system provided by an embodiment of the present application.

FIG. 6 is a schematic flowchart of a method for controlling a passive NFC chip provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

A passive NFC display device, that is, a display device without power supply, relies on its external antenna signal to radiate energy, and converts the wireless signal into electrical energy, which is used by the passive NFC display device to display. NFC (NearField Communication, Near Field Communication) is an emerging technology. Devices using NFC technology (such as mobile phones) can exchange data when they are close to each other. It evolved from the integration of interconnection technology. By integrating the functions of inductive card reader, inductive card and point-to-point communication on a single chip, mobile terminals are used to realize applications such as mobile payment, electronic ticketing, access control, mobile identification, and anti-counterfeiting.

For example, a passive NFC display device can be applied to an employee's smart badge. When the user's electronic device such as a mobile phone is close to the smart badge, the passive display device equipped with a passive NFC chip can receive the antenna signal radiated by the mobile phone and Obtain electric energy, then control the display drive circuit to supply power to the electronic paper, and obtain the display data signal of the electronic paper, so that the identity information of the employee can be displayed on the smart badge, which can save power and keep the identity information of the employee confidential . Alternatively, employees can also connect the smart badge to the access control. When the smart badge is close to the access control, the smart badge receives the wireless signal of the access control, converts the wireless signal into electrical energy storage, and then supplies power to the display drive circuit. Combined with the display data such as The QR code is displayed on the smart badge, and the access control scans the QR code to open the door for employees.

For another example, passive NFC display devices can also be applied to smart labels, which are used to identify information such as prices and specifications of goods. When no electronic equipment is close, the smart label does not display content; The passive NFC chip in the label performs a series of operations such as receiving wireless signals, converting wireless signals into electrical energy, supplying power to the display drive circuit, and providing display data to electronic paper, so that the smart label displays preset content.

Of course, the passive NFC display device can also be applied in other scenarios, the above is only an example, and should not be understood as a limitation on the passive NFC display device.

Wherein, the passive NFC display device may include a passive NFC chip and electronic paper, the passive NFC chip realizes the acquisition, storage and supply of electric energy, and the electronic paper is used to receive electric energy and control signals to realize the display of preset content. However, when the passive NFC chip cooperates with the electronic paper outside the chip, it is necessary to set up a circuit that cooperates with the passive NFC chip and the electronic paper, which takes up a large space.

In order to solve the above problems, embodiments of the present application provide a passive NFC chip, a control method thereof, and a passive NFC display device, which will be described below with reference to the accompanying drawings.

For example, please refer to FIG. 1 , which is a schematic structural diagram of a passive NFC display device provided by an embodiment of the present application. The embodiment of the present application provides a passive NFC display device 1. The passive NFC display device 1 can be applied in scenarios such as smart badges and smart labels to save power and realize functions such as confidentiality. The passive NFC display device 1 has no power supply, and relies on external wireless signals to acquire, store and supply power. For example, the passive NFC display device 1 may include a passive NFC chip 10 and an electronic paper 20, the passive NFC chip 10 is the control center of the passive NFC display device 1, and the electronic paper 20 is the main display component of the passive NFC display device 1 , the electronic paper 20 is used to display preset information. The electronic paper 20 is electrically connected to the passive NFC chip 10, and the electronic paper 20 is used to receive electric energy and control signals to realize the display of preset content. to display.

In order to reduce the occupied space of the matching circuit cooperating with the passive NFC chip 10 and the electronic paper 20 , the embodiment of the present application improves the passive NFC chip 10 .

For example, please refer to FIG. 2 in combination with FIG. 1 . FIG. 2 is a schematic diagram of a first structure of a passive NFC chip provided by an embodiment of the present application. The passive NFC chip 10 includes a conversion circuit 11 , an energy management circuit 12 , a display driving circuit 13 and a processor 14 .

The conversion circuit 11 is used to connect with the antenna, cooperate with the antenna to receive the wireless signal in the space, and convert the wireless signal into electric energy or electric signal, under the action of the electric energy or electric signal, the conversion circuit 11 can be activated to work and Continue to receive wireless signals in the space, so that the conversion circuit 11 can form an effective positive feedback mechanism, so that the conversion circuit 11 completes the collection of micro-energy without battery or power source excitation. The conversion circuit 11 of the embodiment of the present application can receive wireless signals in the space and convert these wireless signals in the form of electromagnetic waves into electrical signals or power signals in the form of current. For example, but not limited to, the conversion circuit 11 can convert wireless signals into micro currents The electrical signal or electrical energy signal in the form can be used for the conversion circuit 11 to work, and the excess electrical energy or electrical signal can also be transmitted to the energy management circuit 12 for storage. It should be noted that the conversion circuit 11 needs to cooperate with the antenna to receive wireless signals in the space.

The energy management circuit 12 is electrically connected with the conversion circuit 11 to store electric energy or electric signals. It can be understood that the energy management circuit 12 stores the electrical signal converted by the conversion circuit 11 for use by the load in the passive NFC display device 1 . Exemplarily, the energy management circuit 12 may include a storage unit and a voltage stabilizing unit, the storage unit is connected to the voltage stabilizing unit, the voltage stabilizing unit detects the electrical signal of the storage unit, and feeds it back to the input terminal of the voltage stabilizing unit, and the comparator The reference voltage in the memory cell is compared, and then adjusted to make the memory cell output a stable voltage signal.

The display driving circuit 13 is electrically connected with the energy management circuit 12 to drive the electronic paper 20 outside the passive NFC chip 10 when the energy management circuit 12 supplies power.

The processor 14 is the control center of the passive NFC chip 10, and the processor 14 is electrically connected to the energy management circuit 12 and the display driving circuit 13 respectively, and the processor 14 is used to control the display driving circuit 13 to turn on or Stop, that is to say, the processor 14 can control whether to supply power to the display driving circuit 13 . It should be noted that displaying preset content on the electronic paper 20 not only needs to supply power to the electronic paper 20, but also needs to provide display data to the electronic paper 20, so that the electronic paper 20 can display the preset content when there is power. Exemplarily, the processor 14 is also configured to acquire display data and transmit the display data to the electronic paper 20 to control the display of the electronic paper 20 .

In the passive NFC chip 10 provided in the embodiment of the present application, the integration of the passive NFC chip 10 can be improved by integrating the display drive circuit 13 that works with the passive NFC chip 10 and the electronic paper 20 into the passive NFC chip 10. degree, and can reduce the occupied space of the display driving circuit 13, thereby helping to reduce the volume of the passive NFC display device 1 as a whole.

Wherein, for example, the passive NFC chip 10 may be provided with a power supply interface and a data interface. The power supply interface is used to electrically connect with the electrical receiving port of the electronic paper 20 so as to supply power to the electronic paper 20 . The data interface is used to electrically connect with the data receiving port of the electronic paper 20 , so as to provide display data for the electronic paper 20 . It can be understood that since the display driver circuit 13 is integrated into the passive NFC chip 10, the port connecting the display driver circuit 13 to the electronic paper 20 can be set on the passive NFC chip 10, and can be connected with the passive NFC chip. Other interfaces on the 10 are prepared together to improve the manufacturing efficiency of the passive NFC chip 10.

Exemplarily, the passive NFC chip 10 can also be provided with a general interface, which is used to electrically connect with the electrical receiving port and the data receiving port of the electronic paper 20 respectively, so as to provide power and display data for the electronic paper 20 respectively.

Wherein, a power supply interface and a data interface may be separately provided for the passive NFC chip 10 for supplying power to the electronic paper 20 and providing display data. Exemplarily, a power supply interface, a data interface and a general interface can also be provided for the passive NFC chip 10 , the power supply interface is used to supply power to the electronic paper 20 , and the data interface is used to provide display data for the electronic paper 20 . The universal interface can be used as a backup interface, and the universal interface can be used when the power supply interface and/or data interface fails, without replacing the entire passive NFC chip 10, which can reduce consumables and improve the flexibility of the device.

For example, please refer to FIG. 3 in conjunction with FIG. 1 and FIG. 2 . FIG. 3 is a schematic diagram of a second structure of a passive NFC chip provided by an embodiment of the present application. The passive NFC chip 10 also includes a switch tube 15, which may be a triode or a transistor, and the switch tube 15 receives a control instruction from the processor 14 to turn on the energy management circuit 12 and the display drive circuit 13, so that the energy management circuit 12 Provide power to the display drive circuit 13. For example, the first end of the switch tube 15 is connected to the energy management circuit 12, the second end is connected to the display driving circuit 13, and the third end is connected to the processor 14, so as to receive a control signal from the processor 14 to make the first end and the second end The terminal is turned on, and then the energy management circuit 12 and the display driving circuit 13 are connected, so that the energy management circuit 12 supplies power to the display driving circuit 13 .

Exemplarily, when the electrical signal of the energy management circuit 12 is greater than or equal to a preset voltage, the processor 14 turns on the first terminal and the second terminal. When the electrical signal of the energy management circuit 12 is lower than the preset voltage, the processor 14 disconnects the first terminal and the second terminal. For example, the preset voltage can be 3V to provide the required working voltage for the display driving circuit 13 . Of course, the above is only an example to illustrate the value of the preset voltage, and should not be construed as a limitation on the preset voltage.

Exemplarily, the passive NFC chip 10 may also include an analog-to-digital conversion circuit 16, and the analog-to-digital conversion circuit 16 is respectively connected to the energy management circuit 12 and the processor 14, so as to convert the analog signal of the energy management circuit 12 into The identified digital signal is transmitted to the processor 14. The analog-to-digital conversion circuit 16 is also called ADC (Analog-to-Digital Converter). ADC is used to convert the analog value from the real world into a digital value, such as 1 and 0. With the duty cycle design, it can realize the passive NFC chip 10 timing design.

It should be noted that there are at least two ways to supply power and provide display data to the electronic paper 20 .

In the first manner, the processor 14 controls to supply power to the electronic paper 20 , and after a preset time delay, the processor 14 controls to send the display data to the electronic paper 20 . It can be understood that if the electronic paper 20 is supplied with power and display data at the same time, when the voltage does not reach the set voltage, the electronic paper 20 will not be powered, and the display data will consume part of the energy, resulting in a waste of resources. In order to reduce the waste of electric energy, the display data can be sent to the electronic paper 20 after powering on the electronic paper 20 for a preset period of time, such as 1 second, so that the display of the electronic paper 20 will not be affected, and the loss of electric energy can be reduced.

Wherein, the preset duration can be set according to the time when the voltage of the energy management circuit 12 reaches the set voltage. In practical applications, for example, voltage detection can be performed on multiple groups of energy management circuits 12, and the preset time can be determined by taking the average value of the detection time. duration.

Among them, the determination of the preset duration can also be determined according to the usage duration of the electronic paper 20. If the electronic paper 20 is used for a long time, that is, the risk of loss of the electronic paper 20 is relatively high, and the response rate of the electronic paper 20 will decrease. Considering this state, a larger preset duration can be set at this time. On the contrary, if the electronic paper 20 is used for a short period of time, that is, the loss of the electronic paper 20 is small, a smaller preset period of time can be set at this time.

In the second way, the processor 14 controls the power supply to the electronic paper 20, and synchronously obtains the feedback signal of the electronic paper 20. The feedback signal is the signal that the electronic paper 20 returns to the processor 14 after receiving electric energy, and the processor 14 receives When receiving a feedback signal from the electronic paper 20 , the control sends the display data to the electronic paper 20 . It can be understood that the power supply status of the electronic paper 20 can be fed back to the processor 14 in real time, so that the power supply of the electronic paper 20 can be known more accurately, and the delay due to the electronic paper 20 being used for a long time can be avoided. The fixed preset duration of time causes the waste of electric energy.

By powering the electronic paper 20 and providing display data in time-sharing, it is possible to reduce the waste of electric energy when providing display data due to the electronic paper 20 not receiving electric energy, and improve the power utilization rate of the energy management circuit 12, thereby improving passive The working stability of the NFC chip 10 .

It should be noted that the pattern or text displayed on the screen needs to be eliminated in the form of "splash screen" when refreshing, which is caused by the characteristics of the electronic paper or ink screen itself. The refresh mode of the electronic paper 20 may include full refresh and partial refresh. The refresh time for general single-color electronic paper is within 2 seconds to 5 seconds, and for three-color electronic paper, the general refresh time is within 15 seconds to 25 seconds. Partial refresh For general monochrome e-paper, the refresh time is in the range of 0.3 seconds to 1 second. Three-color e-paper does not support partial refresh. The screen does not flicker during the refresh process, and you can choose any position for partial display. Since the areas refreshed by the full refresh and the partial refresh are different, the power consumed by the two refresh methods is also different. Therefore, it is necessary to determine the refresh mode of the electronic paper 20 according to the power condition of the energy management circuit 12 to match the working state of the passive NFC display device 1 and improve the working performance of the passive NFC display device 1 .

Exemplarily, the processor 14 is also used to: acquire the power of the energy management circuit 12; if the power of the energy management circuit 12 is greater than or equal to the preset power, perform all refresh processing on the electronic paper 20; if the power of the energy management circuit 12 If the power is less than the preset power, the electronic paper 20 is partially refreshed. It can be understood that when the power of the energy management circuit 12 exceeds the preset power, it means that the power is sufficient at this time, and all refresh processing can be performed to eliminate the display afterimage of the electronic paper 20 and improve the display effect of the electronic paper 20 . Correspondingly, when the power of the energy management circuit 12 is less than the preset power, it indicates that the power is not sufficient at this time, and the refresh process of the local important area such as the price area of the commodity smart label can be performed to eliminate the afterimage in the local area and improve the viewing experience of the user. experience. Wherein, the preset electric quantity can be determined according to experiments.

For the energy management circuit 12, a capacitor may be included, and the capacitor is used to store electrical energy. However, due to long-term use, aging and capacitance attenuation are prone to occur, resulting in unstable operation of the passive NFC chip or failure to meet the use requirements.

In order to reduce the occurrence of the above situation, the embodiment of the present application also provides the following two ways to solve the problem, which will be described respectively below.

For the first method, please refer to FIG. 4 in conjunction with FIG. 1 to FIG. 3 . FIG. 4 is a schematic structural diagram of an energy management circuit provided by an embodiment of the present application. The energy management circuit 12 may include a first capacitor C1 , a second capacitor C2 and a switching circuit 120 . The first capacitor C1 has a first capacity, the second capacitor C2 is connected in parallel with the first capacitor C1, the second capacitor C2 has a second capacity, and the second capacity is greater than or equal to the first capacity. The switching circuit 120 is connected to the first capacitor C1 and the second capacitor C2 respectively, and is connected to the processor 14 . The switching circuit 120 is used for switching the power supply of the first capacitor C1 and/or the second capacitor C2 according to the control signal of the processor 14 . That is to say, the first capacitor C1 can be controlled to supply power alone, the second capacitor C2 can also be controlled to supply power alone, and the first capacitor C1 and the second capacitor C2 can also be controlled to supply power together, so as to meet the needs of different electric quantities. In addition, it is possible to switch between two capacitors, delay the attenuation and aging speed of a single capacitor, and improve the working stability of the passive NFC chip 10 .

Wherein, for example, the switching circuit 120 may include a first switching element 121 and a second switching element 122, the first end of the first switching element 121 is connected to the first capacitor C1, and the second end of the first switching element 121 is connected to the display The driving circuit 13 is connected, and the third end of the first switch 121 is connected to the processor 14 . A first end of the second switching element 122 is connected to the second capacitor C2 , a second end of the second switching element 122 is connected to the display driving circuit 13 , and a third end of the second switching element 122 is connected to the processor 14 . For example, the first switching element 121 and the second switching element 122 may both be triodes or transistors, and the processor 14 may select the first capacitor C1 and/or or the second capacitor C2 for power supply.

Wherein, for example, the capacity of the second capacitor C2 may be greater than the capacity of the first capacitor C1, the first capacitor C1 may be used to supply power to the processor 14, and the second capacitor C2 is used to supply power to the display driving circuit 13, thereby satisfying Power consumption requirements of different devices.

In the second way, the energy management circuit 12 can include a capacitor and an external interface, and the external interface can be connected to a capacitor arranged outside the passive NFC chip 10. On the one hand, the energy management circuit 12 can be expanded to increase the energy management circuit. 12 stored electric energy or replace the original damaged capacitor; on the other hand, it does not need to occupy the space of the passive NFC chip 10, which can help to carry out chip miniaturization design, and when the capacitor in the chip is damaged, there is no need to scrap the entire chip, reducing the waste of resources .

For example, please refer to FIG. 5 in conjunction with FIG. 1 to FIG. 4 , and FIG. 5 is a schematic structural diagram of a passive NFC system provided by an embodiment of the present application. The embodiment of the present application also provides a passive NFC system 1000. The passive NFC system 1000 includes a passive NFC display device 1 and a mobile terminal 2. For the passive NFC display device 1, reference may be made to the above description, which will not be repeated here. The mobile terminal 2 includes a transmitting circuit 40 for transmitting wireless signals. The passive NFC display device 1 is used to receive a wireless signal when it is close to the mobile terminal 2, so that the conversion circuit 11 of the passive NFC display device 1 can capture the wireless signal transmitted by the transmission circuit 40 of the mobile terminal 2 and convert it into electrical energy , for the load of the passive NFC chip 10 and its passive NFC display device 1 . Of course, when the mobile terminal 2 is close to the passive NFC display device 1 , the two can also communicate, such as identifying whether the wireless signal is transmitted by a person with known information, so as to improve the security performance of the passive NFC device 1 .

In the passive NFC chip 10, the passive NFC display device 1 and the passive NFC system 1000 provided in the embodiment of the present application, the display drive circuit 13 that works with the passive NFC chip 10 and the electronic paper 20 is integrated into the passive NFC In the chip 10 , the integration degree of the passive NFC chip 10 can be improved, and the occupied space of the display driving circuit 13 can be reduced, thereby helping to reduce the overall volume of the passive NFC display device 1 .

In order to more clearly illustrate the working process of the passive NFC chip 10 in the embodiment of the present application, the embodiment of the present application also provides a control method for the passive NFC chip, which will be described below with reference to the accompanying drawings.

For example, please refer to FIG. 6 in conjunction with FIG. 1 to FIG. 5 . FIG. 6 is a schematic flowchart of a control method for a passive NFC chip provided by an embodiment of the present application. The embodiment of the present application provides a control method of a passive NFC chip, including:

101. Convert wireless signals in the space into electrical energy, and store and manage the electrical energy.

The passive NFC display device 1 has no power supply, and the passive NFC display device 1 can be powered by acquiring wireless signals in the space and converting the wireless signals into electrical energy.

For example, a conversion circuit 11 may be provided in the passive NFC chip 10, and the conversion circuit 11 cooperates with the antenna to obtain wireless signals in the space. The conversion circuit 11 can receive wireless signals in the space and convert these wireless signals in the form of electromagnetic waves into electric signals or power signals in the form of current. For example, but not limited to, the conversion circuit 11 can convert wireless signals into electrical signals in the form of micro currents or The electric energy signal can be used for the conversion circuit 11 to work, and the excess electric energy or electric signal can also be transmitted to the energy management circuit 12 for storage.

The energy management circuit 12 is electrically connected with the conversion circuit 11 to store electric energy or electric signals. It can be understood that the energy management circuit 12 stores the electrical signal converted by the conversion circuit 11 for use by the load in the passive NFC display device 1 . Exemplarily, the energy management circuit 12 may include a storage unit and a voltage stabilizing unit, the storage unit is connected to the voltage stabilizing unit, the voltage stabilizing unit detects the electrical signal of the storage unit, and feeds it back to the input terminal of the voltage stabilizing unit, and the comparator The reference voltage in the memory cell is compared, and then adjusted to make the memory cell output a stable voltage signal.

102. When the voltage of the electric energy reaches the set voltage, drive the electronic paper, and transmit the display data to the electronic paper, so as to control the display of the electronic paper.

Since the working voltage of the electronic paper 20 is determined, when the voltage of the stored electric energy reaches the set voltage, the electronic paper 20 can be driven, or the display drive circuit 13 can be powered, and the display data can be transmitted to the electronic paper 20 to control the electronic paper. The paper 20 displays preset content.

It should be noted that displaying preset content on the electronic paper 20 not only needs to supply power to the electronic paper 20, but also needs to provide display data to the electronic paper 20, so that the electronic paper 20 can display the preset content when there is power. Exemplarily, the processor 14 is also configured to acquire display data and transmit the display data to the electronic paper 20 to control the display of the electronic paper 20 .

Wherein, supplying power to the electronic paper 20 and providing display data can be performed in a time-sharing manner, so that display data can be transmitted and used during power supply, reducing waste of electric energy and improving resource utilization.

For example, the processor 14 controls to supply power to the electronic paper 20 , and after a preset time delay, the processor 14 controls to send the display data to the electronic paper 20 . It can be understood that if the electronic paper 20 is supplied with power and display data at the same time, when the voltage does not reach the set voltage, the electronic paper 20 will not be powered, and the display data will consume part of the energy, resulting in a waste of resources. In order to reduce the waste of electric energy, the display data can be sent to the electronic paper 20 after powering on the electronic paper 20 for a preset period of time, such as 1 second, so that the display of the electronic paper 20 will not be affected, and the loss of electric energy can be reduced.

Wherein, the preset duration can be set according to the time when the voltage of the energy management circuit 12 reaches the set voltage. In practical applications, for example, voltage detection can be performed on multiple groups of energy management circuits 12, and the preset time can be determined by taking the average value of the detection time. duration.

Among them, the determination of the preset duration can also be determined according to the usage duration of the electronic paper 20. If the electronic paper 20 is used for a long time, that is, the risk of loss of the electronic paper 20 is relatively high, and the response rate of the electronic paper 20 will decrease. Considering this state, a larger preset duration can be set at this time. On the contrary, if the electronic paper 20 is used for a short period of time, that is, the loss of the electronic paper 20 is small, a smaller preset period of time can be set at this time.

For another example, the processor 14 controls the power supply to the electronic paper 20, and synchronously obtains the feedback signal of the electronic paper 20. The feedback signal is the signal that the electronic paper 20 returns to the processor 14 after receiving electric energy. 20, the controller sends the display data to the electronic paper 20. It can be understood that the power supply status of the electronic paper 20 can be fed back to the processor 14 in real time, so that the power supply of the electronic paper 20 can be known more accurately, and the delay due to the electronic paper 20 being used for a long time can be avoided. The fixed preset duration of time causes the waste of electric energy.

By powering the electronic paper 20 and providing display data in time-sharing, it is possible to reduce the waste of electric energy when providing display data due to the electronic paper 20 not receiving electric energy, and improve the power utilization rate of the energy management circuit 12, thereby improving passive The working stability of the NFC chip 10 .

In the control method of the passive NFC chip provided in the embodiment of the present application, by integrating the display drive circuit 13 that works with the passive NFC chip 10 and the electronic paper 20 into the passive NFC chip 10, the passive NFC chip 10 can be improved. integration, and can reduce the occupied space of the display driving circuit 13, thereby helping to reduce the overall volume of the passive NFC display device 1.

It should be noted that the pattern or text displayed on the screen needs to be eliminated in the form of "splash screen" when refreshing, which is caused by the characteristics of the electronic paper or ink screen itself. The refresh mode of the electronic paper 20 may include full refresh and partial refresh. The refresh time for general single-color electronic paper is within 2 seconds to 5 seconds, and for three-color electronic paper, the general refresh time is within 15 seconds to 25 seconds. Partial refresh For general monochrome e-paper, the refresh time is in the range of 0.3 seconds to 1 second. Three-color e-paper does not support partial refresh. The screen does not flicker during the refresh process, and you can choose any position for partial display. Since the areas refreshed by the full refresh and the partial refresh are different, the power consumed by the two refresh methods is also different. Therefore, it is necessary to determine the refresh mode of the electronic paper 20 according to the power condition of the energy management circuit 12 to match the working state of the passive NFC display device 1 and improve the working performance of the passive NFC display device 1 .

Exemplarily, the processor 14 is also used to: acquire the power of the energy management circuit 12; if the power of the energy management circuit 12 is greater than or equal to the preset power, perform all refresh processing on the electronic paper 20; if the power of the energy management circuit 12 If the power is less than the preset power, the electronic paper 20 is partially refreshed. It can be understood that when the power of the energy management circuit 12 exceeds the preset power, it means that the power is sufficient at this time, and all refresh processing can be performed to eliminate the display afterimage of the electronic paper 20 and improve the display effect of the electronic paper 20 . Correspondingly, when the power of the energy management circuit 12 is less than the preset power, it indicates that the power is not sufficient at this time, and the refresh process of the local important area such as the price area of the commodity smart label can be performed to eliminate the afterimage in the local area and improve the viewing experience of the user. experience. Wherein, the preset electric quantity can be determined according to experiments.

The way to refresh the electronic paper 20 is determined according to the power of the energy management circuit 12 , so that the passive NFC display device 1 can present a better display effect, reduce afterimages, and improve user viewing experience.

It should be noted that the energy management circuit 12 or the energy storage will age after being used for a period of time, and the total amount of stored energy will decrease. In addition, there are certain errors in the process of the energy storage. In order to ensure that the energy stored in the energy storage is sufficient , it is necessary to make the energy store store more energy than needed. Exemplarily, the energy stored in the energy storage needs to drive external devices, such as driving an external motor or driving an external electronic paper. In order to ensure that the stored energy is sufficient, the energy stored in the energy storage is much more than the required energy, for example, exceeding the required energy 20%. During the use of the energy storage, it is necessary to judge whether the energy stored in the energy storage is full. If it is full, the output will drive external devices such as external motors, which will cause the start time of driving the motor to be slow and the response will not be timely.

In some implementation manners, the aging information of the energy storage is obtained, for example, the aging information may be obtained through the voltage value when the energy storage is full, or the aging information may be obtained through the usage time of the energy storage. After obtaining the aging information, the target comparison voltage is determined. Then obtain the real-time voltage of the energy storage during the charging process. When the real-time voltage reaches the target comparison voltage, it means that the energy stored in the energy storage is sufficient for external devices. At this time, the energy storage can be controlled to supply external power to drive external devices. No energy storage is needed. When the storage is full, the motor can be driven to start working faster, and the response is more timely.

In some implementation manners, the aging information of the energy storage is obtained, for example, the aging information may be obtained through the voltage value when the energy storage is full, or the aging information may be obtained through the usage time of the energy storage. Obtain the real-time voltage of the energy storage during the charging process, calculate the implementation voltage according to the aging information, and compare the calculated voltage information with the reference voltage. When the calculated voltage information reaches the reference voltage, it indicates the energy stored in the energy storage. Enough for the use of external devices. At this time, the energy storage can be controlled to provide external power to drive external devices. It does not require the energy storage to be full, and the motor can be driven to start working faster and the response is more timely.

Among them, in some examples, the analog-to-digital converter (ADC) set inside the passive NFC chip is connected to the energy storage and the processor, and its voltage value can be converted into a digital signal in real time and provided to the processor, and the processor can use the digital signal The voltage value of the energy storage is determined, and when the energy storage is full, the aging information can also be determined through the voltage value. For example, it can be obtained by means of table lookup, relational calculation, and the like. In other examples, the timer set inside the passive NFC chip is connected to the processor. When the energy storage starts to charge or the processor starts to work, it can drive the counter to start working and start counting until the energy storage or the control stops working. The processor can obtain the working time of the energy storage through the timer, and obtain aging information through the working time. For example, it can be obtained by means of table lookup, relational calculation, and the like.

After the aging of the energy storage reaches a certain level, the energy stored in the energy storage cannot meet the drive of external devices. In some examples, in addition to the energy storage that works normally at the beginning, a backup energy storage can also be set. After the energy storage that works normally at the beginning is aged to a certain extent, it can be switched to the backup energy storage, which can provide enough energy to drive External devices to extend the working life of passive NFC chips. For example, in some other examples, in addition to the energy storage that works normally at the beginning, an auxiliary energy storage can also be set. The memories work in parallel, and the two energy stores in parallel can provide enough energy to drive external devices and prolong the working life of the passive NFC chip.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

In the description of the present application, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

The passive NFC chip and its control method and the passive NFC display device provided by the embodiments of the present application have been introduced in detail above. In this paper, specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments It is only used to help understand the method of this application and its core idea; at the same time, for those skilled in the art, according to the idea of this application, there will be changes in the specific implementation and application scope. In summary, the content of this specification It should not be construed as a limitation of the application.

Claims (10)

1. A passive NFC chip, comprising:

the conversion circuit is used for being matched with the antenna to convert the wireless signals in the space into electric energy;

an energy management circuit electrically connected to the conversion circuit to store and manage the electrical energy;

the display driving circuit is electrically connected with the energy management circuit to drive the electronic paper outside the passive NFC chip when the energy management circuit supplies power;

and the processor is respectively and electrically connected with the energy management circuit and the display driving circuit, and when the voltage of the energy management circuit reaches a set voltage, the processor controls the energy management circuit to be communicated with the display driving circuit and transmits display data to the electronic paper so as to control the electronic paper to display.

2. The passive NFC chip according to claim 1, wherein the processor controls power to the electronic paper, and after a predetermined period of time, the processor controls the display data to be transmitted to the electronic paper.

3. The passive NFC chip according to claim 1, wherein the processor controls power supply to the electronic paper, and synchronously obtains a feedback signal of the electronic paper, and when the processor receives the feedback signal of the electronic paper, the processor controls to send the display data to the electronic paper.

4. The passive NFC chip according to any one of claims 1 to 3, wherein when an electric quantity of the energy management circuit is greater than or equal to a preset electric quantity, the processor controls to perform all refresh processing on the electronic paper;

and when the electric quantity of the energy management circuit is smaller than the preset electric quantity, the processor controls the electronic paper to be subjected to local refreshing processing.

5. The passive NFC chip according to claim 4, characterized in that it is provided with:

the power supply interface is used for connecting the electric receiving port of the electronic paper so as to supply power for the electronic paper;

and the data interface is used for being connected with the data receiving port of the electronic paper so as to provide display data for the electronic paper.

6. A passive NFC display device, comprising:

a passive NFC chip as claimed in any one of claims 1-5; and

and the electronic paper is electrically connected with the passive NFC chip so as to display under the control of the passive NFC chip.

7. A control method of a passive NFC chip, comprising:

converting wireless signals in a space into electric energy, and storing and managing the electric energy;

when the voltage of the electric energy reaches a set voltage, driving the electronic paper, and transmitting display data to the electronic paper so as to control the electronic paper to display.

8. The control method according to claim 7, wherein driving the electronic paper when the voltage of the electric power reaches a set voltage and transmitting display data to the electronic paper to control the electronic paper to display, comprises:

powering the electronic paper;

and after delaying for a preset time length, sending the display data to the electronic paper.

9. The control method according to claim 7, wherein when the voltage of the electric power reaches a set voltage, the electronic paper is driven, and display data is transmitted to the electronic paper to control the electronic paper to display, further comprising:

supplying power to the electronic paper, and synchronously acquiring a feedback signal of the electronic paper;

and when receiving the feedback signal of the electronic paper, sending the display data to the electronic paper.

10. The control method according to claim 7, characterized in that the control method further comprises:

acquiring the stored electric quantity;

if the electric quantity is larger than or equal to the preset electric quantity, carrying out all refreshing treatment on the electronic paper;

and if the electric quantity is smaller than the preset electric quantity, carrying out local refreshing processing on the electronic paper.

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