CN117789665A

CN117789665A - Passive driving circuit of ink screen, control method thereof and mobile phone shell

Info

Publication number: CN117789665A
Application number: CN202410217762.0A
Authority: CN
Inventors: 刘志永; 艾满荣; 修惠文; 李卓盛
Original assignee: Shenzhen Meikai Innovation Technology Co ltd
Current assignee: Shenzhen Meikai Innovation Technology Co ltd
Priority date: 2024-02-28
Filing date: 2024-02-28
Publication date: 2024-03-29
Anticipated expiration: 2044-02-28

Abstract

The embodiment of the application provides a passive drive circuit of ink screen, its control method and cell-phone shell, passive drive circuit includes: an antenna circuit; the power supply circuit is connected with the antenna circuit and is used for acquiring wireless radio frequency energy emitted by external equipment through the antenna circuit and converting the wireless radio frequency energy into electric energy; a wireless communication circuit electrically connected to the antenna circuit for communicating with an external device through the antenna circuit; if the power supply circuit obtains electric energy through the antenna circuit, the wireless communication circuit and the antenna circuit are conducted after the first time period is delayed, so that the wireless communication circuit obtains a data signal of the ink screen updated display content through the antenna circuit. The power supply circuit delays the first time period before the wireless communication circuit communicates with the external device through the antenna circuit, and in the first time period, the external device and the passive driving circuit only have energy transmission, no data transmission and the wireless communication function of the external device is not affected.

Description

Passive driving circuit of ink screen, control method thereof and mobile phone shell

Technical Field

The application relates to the technical field of electronics, in particular to a passive driving circuit of an ink screen, a control method of the passive driving circuit and a mobile phone shell.

Background

With the development of society, mobile phones have become indispensable equipment in people's daily life, and with the increasing of mobile phone functions, the use scene of mobile phones is also more and more, and the time of using mobile phones is also longer and more. At present, mobile phones are generally equipped with mobile phone shells to protect the mobile phones, and some mobile phone shells are provided with patterns to meet the demands of customers. Some mobile phone shells are provided with electronic ink screens, and the electronic ink screens can change different display contents according to requirements, however, signals in the working process of a driving circuit for driving the electronic screen in the related technology can influence the original wireless function of the mobile phone.

Disclosure of Invention

The embodiment of the application provides a passive drive circuit and cell-phone shell of ink screen, and passive drive circuit directly obtains the electric energy from external equipment, need not set up the battery, and it is more convenient to use.

In a first aspect, embodiments of the present application provide a passive driving circuit of an ink screen, including:

an antenna circuit;

the power supply circuit is connected with the antenna circuit and is used for acquiring wireless radio frequency energy emitted by external equipment through the antenna circuit and converting the wireless radio frequency energy into electric energy;

a wireless communication circuit electrically connected to the antenna circuit for communicating with an external device through the antenna circuit;

if the power supply circuit obtains electric energy through the antenna circuit, the wireless communication circuit and the antenna circuit are conducted after a first time period is delayed, so that the wireless communication circuit obtains a data signal of the updated display content of the ink screen through the antenna circuit.

In some embodiments, the passive drive circuit further comprises:

the input end of the switch circuit is connected with the antenna circuit, the output end of the switch circuit is connected with the wireless communication circuit, and the control end of the switch circuit is connected with the power supply circuit;

the power supply circuit controls the switching circuit to be opened or closed so as to disconnect or connect the antenna circuit and the wireless communication circuit.

In some embodiments, the power supply circuit includes:

and the timer is connected with the antenna, and when the antenna outputs electric energy, the timer starts to count and controls the switching circuit to switch from off to on after the count reaches a first time period.

In some embodiments, the wireless communication circuit comprises:

the NFC chip is connected to the output end of the switch circuit, and the NFC chip acquires electric energy and data signals through the antenna circuit;

the processor is connected with the NFC chip, can be powered by the NFC chip and acquire the data signals, and controls the ink screen to update display contents according to the data signals.

In some embodiments, the power supply circuit further comprises:

the energy storage is connected with the output end of the antenna circuit and stores the electric energy, and the energy storage is connected with the ink screen and supplies power for the ink screen;

the input end of the transformation circuit is connected with the energy storage, the output end of the transformation circuit is connected with the ink screen, the voltage output by the output end of the transformation circuit is different from the voltage of the energy storage, the transformation circuit is also connected with the processor, and after the wireless communication circuit acquires the data signal, the processor controls the transformation circuit to output a voltage signal.

In some embodiments, the power supply circuit further comprises:

a current limiting resistor connected between the antenna circuit and the energy storage;

the second switching tube is connected between the antenna circuit and the energy storage, the control end of the second switching tube is connected with the processor, and after the wireless communication circuit acquires the data signal, the processor controls the second switching tube to be switched from off to on.

In a second aspect, embodiments of the present application further provide a mobile phone case, which includes:

a housing;

an ink screen mounted to the housing;

and the passive driving circuit is arranged on the shell and connected with the ink screen, and the passive driving circuit is any one of the passive driving circuits.

In a third aspect, embodiments of the present application further provide a method for controlling a passive driving circuit of an ink screen, where the passive driving circuit includes an antenna circuit, a wireless communication circuit, and a power supply circuit, and the method includes:

if the power supply circuit obtains radio frequency energy emitted by external equipment through the antenna circuit and converts the radio frequency energy into electric energy, delaying a first time period;

the wireless communication circuit and the antenna circuit are conducted, so that the wireless communication circuit obtains a data signal of the updated display content of the ink screen through the antenna circuit;

and controlling the ink screen to update display content according to the data signal.

In some embodiments, the wireless communication circuit comprises an NFC chip and a processor, the power supply circuit comprising an energy storage and a timer; the control method comprises the following steps:

the antenna circuit acquires radio frequency energy emitted by external equipment and converts the radio frequency energy into electric energy, and then charges the energy storage and supplies power to the timer;

the timer starts to count;

when the timer counts up to a first time period, the timer controls the antenna circuit to be connected with the NFC chip, so that the NFC chip can acquire electric energy and data signals provided by external equipment through the antenna circuit;

the NFC chip supplies power to the processor so that the processor starts working, and the NFC chip also transmits the data signal to the processor;

and the processor controls the energy storage to supply power to the ink screen and controls the ink screen to update display content according to the data signal.

In some embodiments, if the power supply circuit obtains radio frequency energy emitted by the external device through the antenna circuit and converts the radio frequency energy into electric energy, before delaying the first period of time, the control method further includes:

the external device sends a radio frequency signal which is used for searching the matching device;

after the wireless communication circuit and the antenna circuit are turned on, the control method further includes:

after the wireless communication circuit is started, communication connection is established with the external equipment;

the external device transmits a data signal.

In the passive driving circuit of the ink screen, the antenna circuit can be in wireless connection with external equipment such as a mobile phone, the power supply circuit can acquire electric energy through the antenna circuit, the wireless communication circuit can perform wireless communication with the external equipment through the antenna circuit, after the power supply circuit acquires electric energy through the antenna circuit, the power supply circuit delays for a first time period, the wireless communication circuit is communicated with the external equipment through the antenna circuit, in the first time period, the external equipment and the passive driving circuit only have energy transmission, no data transmission is caused, the wireless communication function of the external equipment is not influenced, and the external equipment can perform wireless communication with the outside normally in the first time period, such as entrance guard identification, public transportation swiping card, mobile payment and the like.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout the following description.

Fig. 1 is a schematic diagram of a first structure of a passive driving circuit according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a second structure of a passive driving circuit according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a third structure of a passive driving circuit according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of an NFC chip provided in an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a processor according to an embodiment of the present application.

Fig. 6 is a schematic diagram of the energy storage and transformation circuit in the passive driving circuit shown in fig. 3.

Fig. 7 is a schematic structural diagram of a gate circuit in a passive driving circuit according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a mobile phone case according to an embodiment of the present application.

Fig. 9 is a flowchart of a control method of a passive driving circuit of an ink screen according to an embodiment of the present application.

Fig. 10 is another flow chart of a control method of a passive driving circuit of an ink screen according to an embodiment of the present application.

Reference numerals illustrate:

1. a mobile phone case;

10. a housing, 110, a protective housing body, 111, a receiving chamber, 112, a bottom wall, 114, an annular wall, 120, a support member, 130, a first cover plate, 150, a second cover plate;

20. an ink screen;

80. a passive driving circuit, 81, an antenna circuit, 82, a wireless communication circuit, 821, a second resonance matching circuit, 83, a power supply circuit, 831, a first resonance matching circuit, 832, a rectifying circuit, 833, a gating circuit, 834, an energy storage 835, a transformer circuit, 836, a timer, 85, and a switching circuit.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments herein.

An embodiment of the present application provides a passive driving circuit of an ink screen, and referring to fig. 1, fig. 1 is a schematic diagram of a first structure of the passive driving circuit provided in the embodiment of the present application. The passive drive circuit 80 includes an antenna circuit 81, a power supply circuit 83, and a wireless communication circuit 82.

The antenna circuit 81 can be connected wirelessly with an external device such as a cellular phone. The power supply circuit 83 is connected to the antenna circuit 81, and the power supply circuit 83 is configured to obtain wireless radio frequency energy emitted by an external device through the antenna circuit 81 and convert the wireless radio frequency energy into electric energy. The wireless communication circuit 82 is electrically connected to the antenna circuit 81, and the wireless communication circuit 82 is configured to communicate with an external device through the antenna circuit 81.

If the power supply circuit 83 obtains electric energy through the antenna circuit 81, the wireless communication circuit 82 and the antenna circuit 81 are turned on after the first time period is delayed, so that the wireless communication circuit 82 obtains a data signal for updating the display content of the ink screen 20 through the antenna circuit 81.

The antenna circuit 81 can be in wireless connection with external equipment such as a mobile phone, the power supply circuit 83 can acquire electric energy through the antenna circuit 81, the wireless communication circuit 82 can perform wireless communication with the external equipment through the antenna circuit 81, after the power supply circuit 83 acquires electric energy through the antenna circuit 81, the power supply circuit 83 delays for a first period of time to enable the wireless communication circuit 82 to communicate with the external equipment through the antenna circuit 81, in the first period of time, the external equipment and the passive driving circuit 80 only have energy transmission, no data transmission does not influence the wireless communication function of the external equipment, and the external equipment can perform wireless communication with the outside normally in the first period of time, such as entrance guard identification, public transportation swiping card, mobile payment and the like.

In some embodiments, referring to fig. 2, fig. 2 is a schematic diagram of a second structure of a passive driving circuit according to an embodiment of the present application. The passive driving circuit 80 further comprises a switch circuit 85, wherein the input end of the switch circuit 85 is connected with the antenna circuit 81, the output end of the switch circuit 85 is connected with the wireless communication circuit 82, and the control end of the switch circuit 85 is connected with the power supply circuit 83; the power supply circuit 83 controls the opening and closing of the switching circuit 85 to turn off or on the antenna circuit 81 and the wireless communication circuit 82.

The default state of the switch circuit 85 is an off state to disconnect the antenna circuit 81 and the wireless communication circuit 82. If the power supply circuit 83 obtains electric energy through the antenna circuit 81, the switch circuit 85 is controlled to switch from the off state to the on state after delaying for a first period of time to turn on the wireless communication circuit 82 and the antenna circuit 81. The opening or closing of the antenna circuit 81 and the wireless communication circuit 82 can be controlled conveniently by the switching circuit 85.

In some embodiments, the power circuit 83 includes a timer 836, the timer 836 is connected to the antenna, and when the antenna outputs power, the timer 836 starts counting, and after the counting reaches a first period, the switch circuit 85 is controlled to switch from off to on.

After the antenna circuit 81 obtains the power, the timer 836 may be powered, the timer 836 starts to count, and the timer 836 counts for a preset first period (the first period may be between 0.5 and 3 seconds, such as 1 second, 2 seconds, etc.), and the timer 836 controls the switch circuit 85 to be turned on, so that the wireless communication circuit 82 may work normally, such as communicating with an external device. During the timing of the timer 836, the external device may normally use NFC functions, such as access identification, mobile payment, public transportation swiping card, etc., using the NFC module.

It is understood that the timer includes a timer, counter, or other device capable of timing.

In other embodiments, the power supply circuit may also include a delay circuit to replace the timer in the above embodiments.

In some embodiments, please refer to fig. 3 to fig. 5, fig. 3 is a third schematic structural diagram of the passive driving circuit provided in the embodiments of the present application, fig. 4 is a schematic structural diagram of the NFC chip provided in the embodiments of the present application, and fig. 5 is a schematic structural diagram of the processor provided in the embodiments of the present application. The wireless communication circuit 82 includes an NFC chip U4 and a processor U5. The NFC chip U4 is connected to the output end of the switch circuit 85, and the NFC chip U4 obtains the electric energy and the data signal through the antenna circuit 81. The processor U5 is connected to the NFC chip U4, and can be powered by the NFC chip and acquire data signals, and the processor U5 further controls the ink screen 20 to update the display content according to the data signals.

The wireless communication circuit 82 may include an NFC chip U4, where the NFC chip U4 may obtain electric energy through the antenna circuit 81, and an energy processing circuit is integrated inside the NFC chip U4 to process energy provided by the antenna circuit 81 and supply power to the NFC chip U4 itself, and may also supply power to other devices, such as to the processor U5, so that the processor U5 may obtain a data signal through the NFC chip U4. The processor U5 obtains a data signal from the NFC chip U4, and may control the ink screen 20 to drive the ink screen 20 to update the display content according to the data signal, that is, drive the ink screen 20 to display a new image.

In some embodiments, please refer to fig. 6, fig. 6 is a schematic diagram of the energy storage and voltage transformation circuit in the passive driving circuit shown in fig. 3. The power supply circuit 83 also includes an energy storage 834 and a transformation circuit 835. An energy storage 834 is connected to an output of the antenna circuit 81 and stores electric energy, and the energy storage 834 is connected to the ink screen 20 and supplies power to the ink screen 20. The input end of the voltage transformation circuit 835 is connected to the energy storage 834, the output end of the voltage transformation circuit 835 is connected to the ink screen 20, the voltage output by the output end of the voltage transformation circuit 835 is different from the voltage of the energy storage 834, the voltage transformation circuit 835 is also connected to the processor U5, and after the wireless communication circuit 82 acquires the data signal, the processor U5 controls the voltage transformation circuit 835 to output a voltage signal.

The energy storage 834 can store electric energy output from the antenna circuit 81. The energy storage 834 may include one or more energy storage capacitors, the number of which may be set as desired, and the parameters of the energy storage capacitors, such as the capacitance, the rated voltage, etc., may be set as desired, such as the number of energy storage capacitors and the parameters of the energy storage capacitors, according to the driving energy required by the ink screen 20.

In some examples, the rated voltage of energy storage 834 may be set higher, such as 5V, 8V, 10V, 12V, 15V, 18V, or even higher. The voltage driving the ink screen 20 need not be so high, as 3.3V is required, and the voltage transformation circuit 835 may step down the high voltage signal stored by the energy storage 834 to form the low voltage signal required to drive the ink screen 20. In some examples, the rated voltage of the energy storage 834 is between 5V-18V, 12V-18V, or 16-18V.

In some examples, energy storage 834 may include three capacitors in parallel, such as capacitor C22, capacitor C23, and capacitor C24.

Of course, it is also understood that energy storage 834 may include only three capacitors in parallel, namely, capacitor C22, capacitor C23, and capacitor C24, and may also include four, five, six, seven, or even eight capacitors in parallel, which is not limited in this embodiment of the present application.

In some examples, the voltage transformation circuit 835 includes a voltage transformation chip U3, an input terminal of the voltage transformation chip U3 is connected to one end of the energy storage 834, an output terminal of the voltage transformation chip U3 outputs a voltage signal, and an enable terminal EN of the voltage transformation chip U3 is connected to the processor U5. The processor U5 may output different signals to the enable terminal EN of the transformer chip U3 according to the requirement, so that the output terminal of the transformer chip U3 outputs a voltage signal or does not output a voltage signal.

In some examples, the transformer circuit 835 further includes a first filter circuit coupled between the input of the transformer chip U3 and ground, the first filter circuit filtering the signal input to the transformer chip U3. The first filter circuit may include one or more filter capacitors, one end of each filter circuit is connected to the input end of the transformer chip, and the other end of each filter capacitor is grounded. It will be appreciated that the parameters of the filter capacitor may be set as desired. For example, the first filter circuit may include capacitors C18 and C19 connected in parallel.

In some examples, the transformer 835 further includes a transformer matching circuit including an inductor L1, a resistor R7, a resistor R6, and a capacitor C13, where one end of the inductor L1 is connected to the output end of the transformer chip, one end of the resistor R7 is connected to the other end of the inductor L1, the resistor R6 is connected between the resistor R7 and ground, and the capacitor C13 is connected between the other end of the inductor L1 and the resistor R7, i.e. in parallel with the resistor R7. The voltage transformation matching circuit may further include a capacitor C14 and a diode D7, where the capacitor C14 is connected between the other end of the inductor L1 and ground, the positive electrode of the diode D7 is connected to the other end of the inductor L1, the negative electrode of the diode D7 outputs a corresponding voltage signal, and the negative electrode of the diode D7 may be used as the output end of the voltage transformation circuit 835.

In some examples, after the switch circuit 85 is turned on, the processor U5 enables the voltage transformation circuit 835, i.e. controls the voltage transformation circuit 835 to start working, so that the energy storage 834 in the power supply circuit 83 outputs a voltage signal through the voltage transformation circuit 835, the voltage signal can supply power to the processor U5, and at this time, the power supply of the processor U5 can be switched from the NFC chip to the voltage transformation circuit 835. When the power supply circuit 83 is charged quickly, the power supply of the NFC chip is unstable, the processor U5 is switched to supply power to the voltage transformation circuit 835, the voltage transformation circuit 835 supplies power stably, the processor U5 can work stably, and the abnormality of the ink screen 20 in the screen brushing process is prevented.

In some examples, the power supply circuit 83 may be powered by the NFC chip after obtaining power through the antenna circuit 81, or may be powered by the transformer circuit 835 during fast charging.

In some embodiments, please refer to fig. 7, fig. 7 is a schematic diagram of a configuration of a gate circuit in a passive driving circuit according to an embodiment of the present application. The power supply circuit 83 further includes a gate circuit 833, and the gate circuit 833 includes a current limiting resistor R15 and a second switching tube Q2. The current limiting resistor R15 is connected between the antenna circuit 81 and the energy storage 834. The second switching tube Q2 is connected between the antenna circuit 81 and the energy storage 834, the control end of the second switching tube Q2 is connected with the processor U5, and after the wireless communication circuit 82 acquires the data signal, the processor U5 controls the second switching tube Q2 to switch from off to on.

When the second switching tube Q2 is turned off, the energy of the antenna circuit 81 charges the energy storage 834 through the current limiting resistor R15, and this can be understood as slow charging of the energy storage 834. When the second switching tube Q2 is turned on, the antenna circuit 81 is directly connected to the energy storage 834, and the energy of the antenna circuit 81 can directly charge the energy storage 834 without passing through the current limiting resistor R15, which is understood as fast charging of the energy storage 834. That is, there are two different impulse modes of slow charge and fast charge to the energy storage 834, and the power input to the energy storage 834 by the antenna circuit 81 during fast charge is greater than the power input to the energy storage 834 by the antenna circuit 81 during slow charge.

The processor U5 is connected to the control end of the second switching tube Q2, that is, the processor U5 can control the switching between the slow charging and the fast charging. In some examples, the antenna circuit 81 obtains a radio frequency signal of an external device, such as a mobile phone, and converts the radio frequency signal into electric energy, the antenna circuit 81 is connected to the energy storage 834 through the current limiting resistor R15, the antenna circuit 81 charges the energy storage 834 slowly, meanwhile, the NFC chip in the wireless communication circuit 82 may also obtain electric energy through the antenna circuit 81 and communicate with an outsourcing device through the antenna circuit 81, such as establishing communication connection, authentication, data signal transmission, and the like, at this time, the antenna circuit 81 does not charge the energy storage 834 quickly, so during quick charging, the power supply circuit 83 may conduct the electric energy of the antenna circuit 81, the NFC chip may not obtain enough electric energy to operate, and during quick charging, the power supply circuit 83 may cause a large interference to communication. After the NFC chip communicates with the external device through the antenna circuit 81, if the transmission of the data signal for changing the display content of the ink screen 20 is completed, the processor U5 controls the second switching tube Q2 to be turned on, so that the electric energy of the antenna circuit 81 does not need to pass through the current limiting resistor R15, but can directly charge the energy storage 834, i.e. enter into fast charging, so that the energy storage 834 can be charged more quickly, and after the energy storage 834 is filled or charged to a certain extent, the ink screen 20 can be driven to update the data signal to update the display content, thereby reducing the waiting duration of a user.

In some examples, the gating circuit 833 may further include a third resistor R36, where the third resistor R36 is connected between the control terminal of the second switching tube Q2 and the input terminal of the second switching tube Q2.

In some examples, the gating circuit 833 may further include a third switching tube Q3, an input terminal of the third switching tube Q3 is connected to a control terminal of the second switching tube Q2, an output terminal of the third switching tube Q3 is grounded, a control terminal of the third switching tube Q3 is connected to the processor U5, and the processor U5 controls on or off of the second switching tube Q2 through the third switching tube Q3. In some examples, the second switching transistor Q2 is a field effect transistor and the third switching transistor Q3 is a triode. In other examples, the second switching tube Q2 and the third switching tube Q3 may be selected as appropriate, for example, a field effect transistor or a triode.

It is further understood that, in some examples, the gating circuit 833 may not be provided with the third switching tube Q3, and the processor U5 directly controls the second switching tube Q2, which is not limited in this embodiment of the present application.

In some embodiments, the power supply circuit 83 further includes a rectifying circuit 832, the rectifying circuit 832 being connected between the antenna circuit 81 and the energy storage 834 to rectify the electrical energy. The rectifying circuit 832 may be provided as needed, for example, the rectifying circuit 832 may include a rectifying bridge, a diode, or other circuits for rectifying.

In some embodiments, the power supply circuit 83 further includes a first resonant matching circuit 831, the first resonant matching circuit 831 is connected between the antenna circuit 81 and the rectifying circuit 832, and the first resonant matching circuit 831 cooperates with the antenna circuit 81 to achieve energy harvesting. The first resonant matching circuit 831 can be configured as desired, for example, the first resonant matching circuit 831 can include 4 capacitors including capacitor C37, capacitor C38, capacitor C3, and capacitor C4. One end of the capacitor C37 is connected to one end of the antenna circuit 81, one end of the capacitor C38 is connected to the other end of the antenna circuit 81, the capacitor C3 and the capacitor C4 are connected between the other end of the capacitor C37 and the other end of the capacitor C38, and the other end of the capacitor C37 and the other end of the capacitor C38 are connected to a back-end circuit such as the rectifying circuit 832.

The first resonant matching circuit 831 can improve the efficiency of energy harvesting of the antenna circuit 81. It will be appreciated that the more closely the frequencies of the transmit and receive antennas are matched, the more efficient the wireless energy transfer will be. The first resonant matching circuit 831 can enable the frequency of the radio frequency signal transmitted by the antenna circuit 81 and the external device to be more matched, thereby improving the efficiency of energy acquisition of the antenna circuit 81.

The antenna circuit 81 may include only one antenna, and the wireless communication circuit 82 and the power supply circuit 83 may be connected to the same antenna. The antenna circuit 81 may also include two antennas, and the wireless communication circuit 82 and the power supply circuit 83 are connected to different antennas.

In some embodiments, referring to fig. 3, the wireless communication circuit 82 may further include a second resonant matching circuit 821, where the second resonant matching circuit 821 is connected between the antenna circuit 81 and the NFC chip U4.

The second resonance matching circuit 821 realizes energy acquisition in cooperation with the antenna circuit 81. The second resonant matching circuit 821 may be provided as needed, for example, the second resonant matching circuit 821 may include 4 capacitors, one end of the capacitor C35 is connected to one end of the antenna circuit 81, one end of the capacitor C36 is connected to the other end of the antenna circuit 81, the capacitor C20 and the capacitor C21 are connected between the other end of the capacitor C35 and the other end of the capacitor C36, and the other end of the capacitor C35 and the other end of the capacitor C36 are connected to a back-end circuit such as an NFC chip.

The NFC chip U4 may obtain electric energy through the second resonant matching circuit 821 and the antenna circuit 81, and the second resonant matching circuit 821 may improve efficiency of energy obtaining by the antenna circuit 81. It will be appreciated that the more closely the frequencies of the transmit and receive antennas are matched, the more efficient the wireless energy transfer will be. The second resonant matching circuit 821 may enable the frequency of the radio frequency signal transmitted from the external device to be more matched with the antenna circuit 81, thereby improving the efficiency of energy acquisition of the antenna circuit 81.

In some embodiments, the second resonant matching circuit 821 is different from the first resonant matching circuit 831, so that the operating frequency when the first resonant matching circuit 831 is matched with the antenna circuit 81 is different from the operating frequency when the second resonant matching circuit 81 is matched with the antenna circuit 81, which can enable the two signals to be staggered, and reduce interference. Correspondingly, the frequencies of the energy signal and the data signal transmitted by the external device may be staggered, e.g. the frequency of the energy signal is slightly lower than the frequency of the data signal.

In some embodiments, passive drive circuit 80 may also include a bluetooth circuit connected to power supply circuit 83 and processor U5, processor U5 being capable of wireless communication with external devices via the bluetooth circuit. The processor U5 may also communicate wirelessly with external devices via bluetooth circuitry, such as to obtain control instructions, transmit data signals to update the display of the ink screen 20, and the like. The Bluetooth circuit has the advantages that the data transmission rate is higher than the data transmission efficiency of the NFC chip, and larger data signals can be transmitted faster.

The embodiment of the application also provides a mobile phone shell, please refer to fig. 8, fig. 8 is a schematic structural diagram of the mobile phone shell provided in the embodiment of the application. The mobile phone case 1 includes a case 10, an ink screen 20, and a passive drive circuit 80. The ink screen 20 is mounted on the housing 10, and the passive driving circuit 80 is mounted on the housing 10 and connected to the ink screen 20, and the passive driving circuit 80 may be any passive driving circuit in the foregoing embodiments, which is not described herein.

In some embodiments, the housing 10 may house a cell phone to protect the cell phone. In other embodiments, the housing 10 may be a rear housing of a cell phone.

In some embodiments, the housing 10 includes a protective housing 110, and the protective housing 110 is provided with a receiving cavity 111 for receiving a mobile phone. The protective housing 110 includes a bottom wall 112 and a surrounding wall 114 disposed around the bottom wall 112, and the bottom wall 112 and the surrounding wall 114 enclose a receiving chamber 111.

The housing 10 may also include a support member 120. The supporting member 120 has a hardness greater than that of the protective case body 110. The support member 120 is at least partially provided on the peripheral side of the ink screen 20 for restricting bending deformation of the ink screen 20.

Then, when the protective case body 110 is deformed by an external force, for example, when the consumer bends the protective case body 110 to disassemble the protective case body 110, the support member 120 with higher hardness is less likely to deform, so that the deformation of the support member 120 can be limited, the ink screen 20 is prevented from being bent to be damaged, and finally, the reliability and the service life of the protective case of the mobile phone can be improved.

In some embodiments, the support member 120 may be a metal piece. For example, the supporting member 120 may be made of stainless steel, aluminum or titanium, etc., which is not limited in the embodiment of the present application.

In some embodiments, the mobile phone case 1 includes a first cover 130, a protective housing 110, and a second cover 150, which are sequentially disposed, the protective housing 110 is provided with an opening, and the ink screen 20 is installed in the opening.

The ink screen 20 is fixedly attached, such as by adhesive or other fastening means, to the second cover plate 150. One end (such as the upper end) of the second cover plate 150 along the length direction of the mobile phone shell is fixedly connected with the protective shell body 110, such as glued or other fixing modes, and the other end (such as the lower end) of the second cover plate 150 along the length direction of the mobile phone shell body is detachably and movably matched with the protective shell body 110. The first cover 130 is fixedly connected to the protective housing 110, such as by gluing or other fixing methods, and the first cover 130 covers the ink screen 20 to protect the ink screen 20. The first cover 130 is a transparent hard protection structure, which may be tempered glass or hard transparent plastic.

Then, taking the case of detaching the mobile phone from the protective housing 110 as an example, the consumer may bend the lower end of the protective housing 110 by bending the lower end of the protective housing 110 so that the lower end of the protective housing 110 is separated from the mobile phone before the protective housing 110 is detached. When the consumer breaks the lower end of the protective housing body 110, the lower end of the second cover plate 150 can be separated from the lower end of the protective housing body 110, so that the second cover plate 150 and the ink screen 20 arranged on the second cover plate 150 can not be broken, and further the ink screen 20 can be prevented from being broken by breaking.

The embodiment of the application also provides a control method of the passive driving circuit of the ink screen, wherein the passive driving circuit comprises an antenna circuit, a wireless communication circuit and a power supply circuit, and the passive driving circuit can be any one of the passive driving circuits in the embodiment, and is not described herein. Referring to fig. 9, fig. 9 is a flow chart of a control method of a passive driving circuit of an ink screen according to an embodiment of the disclosure. The control method comprises the following steps:

901, if the power supply circuit obtains the radio frequency energy emitted by the external device through the antenna circuit and converts the radio frequency energy into electric energy, the first time period is delayed.

The antenna circuit can be connected with external equipment such as a mobile phone in a wireless mode, and the power supply circuit can acquire electric energy through the antenna circuit. The power supply circuit can be matched with the antenna circuit to acquire radio frequency energy emitted by external equipment and convert the radio frequency energy into electric energy. The first period of time may be set as desired. For example, it may be between 0.5 and 3 seconds, such as 1 second, 2 seconds, etc.

And 902, conducting the wireless communication circuit and the antenna circuit so that the wireless communication circuit obtains a data signal of the ink screen updated display content through the antenna circuit.

The wireless communication circuit may perform wireless communication with an external device through the antenna circuit.

903, the ink screen is controlled to update the display content according to the data signal.

After the power supply circuit obtains electric energy through the antenna circuit, the power supply circuit delays a first time period before the wireless communication circuit communicates with external equipment through the antenna circuit, and in the first time period, the external equipment and the passive driving circuit only have energy transmission, have no data transmission and do not influence the wireless communication function of the external equipment, and the external equipment can normally communicate with the outside in the first time period in a wireless mode, such as entrance guard identification, public transportation card swiping, mobile payment and the like.

In some embodiments, the wireless communication circuit includes an NFC chip and a processor, and the power supply circuit includes an energy storage and a timer; referring to fig. 10, fig. 10 is another flow chart of a control method of a passive driving circuit of an ink screen according to an embodiment of the present application. The control method comprises the following steps:

911, the antenna circuit obtains the radio frequency energy emitted by the external device and converts the radio frequency energy into electric energy, and then charges the energy storage and supplies power to the timer.

The antenna circuit may be wirelessly connected to an external device, such as a cellular phone, and converts radio frequency energy emitted by the external device into electrical energy. The energy storage may store the electrical energy, and the timer may be powered by the electrical energy.

912, a timer begins counting.

The timer starts working after being powered by the electric energy, namely starts timing.

913, when the timer counts up to the first time period, the timer controls the antenna circuit to be connected with the NFC chip, so that the NFC chip obtains electric energy and a data signal provided by an external device through the antenna circuit.

The first period of time may be set as desired. For example, it may be between 0.5 and 3 seconds, such as 1 second, 2 seconds, etc. The NFC chip can acquire electric energy through the antenna circuit, and the energy processing circuit is integrated in the NFC chip so as to process the energy provided by the antenna circuit and supply power to the NFC chip.

914, the NFC chip supplies power to the processor to enable the processor to start operating, and the NFC chip also transmits a data signal to the processor.

The NFC signal may also power other devices such as a processor, enabling the processor to obtain the data signal through the NFC chip. The data signal is data corresponding to the updated display content of the ink screen, namely data for displaying a new image on the ink screen.

915, the processor controls the energy storage to supply power to the ink screen, and controls the ink screen to update the display content according to the data signal.

Compared with the NFC chip, the energy storage can provide more energy, and the processor controls the energy storage to supply power to the ink screen and controls the ink screen to display a new image according to the data signal.

After the power supply circuit obtains electric energy through the antenna circuit, the timer starts to work and counts a first time period before the wireless communication circuit communicates with external equipment through the antenna circuit, in the first time period, the external equipment and the passive driving circuit only have energy transmission, have no data transmission, do not influence the wireless communication function of the external equipment, and the external equipment can normally communicate with the outside in the first time period in a wireless mode, such as access control identification, public transportation card swiping, mobile payment and the like.

After the timer controls the wireless communication circuit to be conducted with the antenna circuit, the NFC chip of the wireless communication circuit acquires electric energy and data signals from the antenna circuit, the NFC chip supplies power to the processor and transmits the data signals to the processor, the processor controls the power supply circuit to supply power to the ink screen, and meanwhile, the ink screen is driven to update display content according to the data signals, and new images corresponding to the data signals are displayed.

In some examples, the first period of time may be preset in advance, or may be transmitted by an external device. For example, the external device may transmit the time required by its NFC module to the passive driver circuit, which saves and replaces the original first period of time to use the updated first period of time at the next run time.

the external device transmits a radio frequency signal for searching for the matching device.

After the APP corresponding to the external equipment is started, the NFC module of the APP searches. Such as transmitting a corresponding search signal.

After the wireless communication circuit and the antenna circuit are conducted, the control method further comprises the steps of:

after the wireless communication circuit is started, communication connection is established with external equipment;

the external device transmits a data signal.

After the wireless communication circuit is started, the NFC module of the mobile phone establishes communication with the NFC chip of the passive driving circuit, and then data signals are transmitted.

The embodiments, implementation manners and related technical features of the present application can be combined and replaced without conflict.

In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The passive driving circuit, the control method thereof and the mobile phone shell of the ink screen provided by the embodiment of the application are described in detail, and specific examples are applied to the description of the principle and the implementation of the application, and the description of the above embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims

1. A passive drive circuit for an ink screen, comprising:

an antenna circuit;

2. The passive drive circuit of claim 1, further comprising:

3. The passive drive circuit of claim 2, wherein the power supply circuit comprises:

4. The passive drive circuit of claim 2, wherein the wireless communication circuit comprises:

5. The passive drive circuit of claim 4, wherein the power supply circuit further comprises:

6. The passive drive circuit of claim 5, wherein the power supply circuit further comprises:

7. A cell phone case, comprising:

a housing;

an ink screen mounted to the housing;

a passive drive circuit mounted to the housing and connected to the ink screen, the passive drive circuit being as claimed in any one of claims 1 to 6.

8. A control method of a passive driving circuit of an ink screen, the passive driving circuit including an antenna circuit, a wireless communication circuit, and a power supply circuit, the control method comprising:

9. The control method of claim 8, wherein the wireless communication circuit comprises an NFC chip and a processor, and the power supply circuit comprises an energy memory and a timer; the control method comprises the following steps:

the timer starts to count;

10. The control method according to claim 8, wherein if the power supply circuit acquires radio frequency energy emitted from an external device through the antenna circuit and converts the radio frequency energy into electric energy, the control method further comprises, before delaying the first period:

the external device transmits a data signal.