CN220731154U

CN220731154U - Passive driving circuit of ink screen and mobile phone shell

Info

Publication number: CN220731154U
Application number: CN202420366643.7U
Authority: CN
Inventors: 刘志永; 艾满荣; 李卓盛; 覃永利
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: 2024-04-05
Anticipated expiration: 2034-02-28

Abstract

The embodiment of the application provides a passive driving circuit of an ink screen and a mobile phone shell, wherein the passive driving circuit is used for driving the ink screen and comprises an antenna circuit; an NFC chip circuit connected with the antenna circuit to communicate with an external device through the antenna circuit; and the power supply circuit is connected with the antenna circuit to acquire electric energy through the antenna circuit, and is used for being connected with the ink screen and supplying power to the ink screen when the ink screen updates display content. The passive drive circuit directly obtains electric energy from the external equipment in a wireless mode, a battery is not required to be arranged, the problem that the ink screen cannot be driven to update display content after the battery is used up is solved, and the use is more convenient. In addition, the thickness of the passive driving circuit can be reduced without arranging a battery, and the passive driving circuit is conveniently arranged in a thinner product (such as a mobile phone shell).

Description

Passive driving circuit of ink screen 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 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, the electronic ink screens in the related art are inconvenient to use due to the fact that batteries are required to be built in.

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, where the passive driving circuit is configured to drive the ink screen, and the passive driving circuit includes:

an antenna circuit;

an NFC chip circuit connected with the antenna circuit to communicate with an external device through the antenna circuit;

and the power supply circuit is connected with the antenna circuit to acquire electric energy through the antenna circuit, and is used for being connected with the ink screen and supplying power to the ink screen when the ink screen updates display content.

In some embodiments, the passive driving circuit further includes a processor, where the processor is connected to the NFC chip circuit, and the processor is configured to obtain a data signal sent by an external device through the NFC chip circuit, and drive the ink screen to update display content according to the data signal.

In some embodiments, the power supply circuit comprises:

one end of the energy storage is connected with the output end of the antenna circuit, and the other end of the energy storage is grounded;

the input end of the transformation circuit is connected with one end of the energy storage, the output end of the transformation circuit is connected with the ink screen, and the voltage output by the output end of the transformation circuit is different from the voltage of the energy storage.

In some embodiments, the transformation circuit comprises:

the input end of the transformation chip is connected with one end of the energy storage, the output end of the transformation chip outputs a voltage signal, and the enabling end of the transformation chip is connected with the processor;

the first filter circuit is connected between the input end of the transformation chip and the ground.

In some embodiments, the power supply circuit further comprises a gating circuit, the gating circuit comprising:

the current limiting resistor is connected between the output end of the antenna circuit and one end of the energy storage;

the input end of the second switching tube is connected with the output end of the antenna circuit, the output end of the second switching tube is connected with one end of the energy storage, and the control end of the second switching tube is connected with the processor.

In some embodiments, the gating circuit further comprises:

the input end of the third switching tube is connected with the control end of the second switching tube, the output end of the third switching tube is grounded, and the control end of the third switching tube is connected with the processor.

In some embodiments, the power supply circuit further comprises:

the rectification circuit is connected between the antenna circuit and the energy storage to rectify the electric energy;

and the first resonance matching circuit is connected between the antenna circuit and the rectifying circuit.

In some embodiments, the NFC chip circuit includes:

an NFC chip;

and the second resonance matching circuit is connected between the antenna circuit and the NFC chip.

In some embodiments, the passive drive circuit further comprises:

and the Bluetooth circuit is connected with the power supply circuit and the processor, and the processor can be in wireless communication with external equipment through the Bluetooth circuit.

The embodiment of the application also provides a mobile phone shell, which comprises:

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 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, and the power supply circuit supplies power to the ink screen when the ink screen updates display content, the passive driving circuit directly acquires electric energy from the external equipment, a battery is not required to be arranged, and the problem that the ink screen cannot be driven to update the display content when the battery is used up does not exist, so that the passive driving circuit is more convenient to use. In addition, the thickness of the passive driving circuit can be reduced without arranging a battery, and the passive driving circuit is conveniently arranged in a thinner product (such as a mobile phone shell). The NFC chip circuit can communicate with external equipment through the antenna circuit, for example, data signals are obtained, the ink screen can update display content according to the data signals, and data signals corresponding to new images can be conveniently obtained, so that the ink screen can update display content conveniently.

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 structural diagram of an NFC chip circuit in the passive driving circuit shown in fig. 2.

Fig. 4 is a schematic diagram of a processor in the passive driving circuit shown in fig. 2.

Fig. 5 is a schematic diagram of the energy storage and transformation circuit in the passive driving circuit shown in fig. 2.

Fig. 6 is a schematic diagram of a configuration of a gate circuit in the passive driving circuit shown in fig. 2.

Fig. 7 is a schematic diagram of a structure of a panel driving circuit in the passive driving circuit shown in fig. 2.

Fig. 8 is a schematic diagram of a third structure of a passive driving circuit according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a fourth configuration of a passive driving circuit according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a mobile phone case 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. the device comprises a passive driving circuit, 81, an antenna circuit, 82, an NFC chip 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 voltage transformation circuit, 836, a timer, 84, a processor, 85, a controllable switch, 86 and a physical switch.

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.

Referring to fig. 1, fig. 1 is a schematic diagram of a first structure of a passive driving circuit provided in an embodiment of the present application. The passive driving circuit 80 is used for driving the ink screen 20, and the passive driving circuit 80 includes an antenna circuit 81, an NFC chip circuit 82, and a power supply circuit 83.

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 to obtain electric power through the antenna circuit 81, and the power supply circuit 83 is used for being connected to the ink screen 20 and supplying power to the ink screen 20 when the ink screen 20 updates display content. The power supply circuit 83 can obtain electric energy through the antenna circuit 81, and supplies power to the ink screen 20 when the ink screen 20 updates display content, the passive driving circuit 80 directly obtains electric energy from external equipment, a battery is not required to be arranged, and the problem that the ink screen 20 cannot be driven to update display content when the battery runs out is solved, so that the ink screen 20 is more convenient to use. In addition, the thickness of the passive driving circuit 80 can be reduced without providing a battery, so that the passive driving circuit 80 can be conveniently arranged in a relatively thin product (such as a mobile phone shell).

The NFC chip circuit 82 is connected to the antenna circuit 81 to communicate with an external device through the antenna circuit 81. The NFC chip circuit 82 may communicate with an external device through the antenna circuit 81, for example, acquire a data signal, and the ink screen 20 may update the display content according to the data signal, and may conveniently acquire a data signal corresponding to a new image, so that the ink screen 20 may update the display content conveniently.

It should be noted that the antenna circuit 81 may include only one antenna, and the NFC chip circuit 82 and the power supply circuit 83 are connected to the same antenna. The antenna circuit 81 may also include two antennas, and the NFC chip circuit 82 and the power supply circuit 83 are connected to different antennas.

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 includes a processor 84, where the processor 84 is connected to the NFC chip circuit 82, and the processor 84 is configured to obtain a data signal sent by an external device through the NFC chip circuit 82, and drive the ink screen 20 to update display content according to the data signal.

Processor 84 may obtain data signals from NFC chip circuit 82 and may control ink screen 20 to drive the ink screen to update the display based on the data signals.

Referring to fig. 3 and fig. 4, fig. 3 is a schematic structural diagram of an NFC chip circuit in the passive driving circuit shown in fig. 2, and fig. 4 is a schematic structural diagram of a processor in the passive driving circuit shown in fig. 2. In some examples, NFC chip circuit 82 may include NFC chip U4, where NFC chip U4 may obtain electrical energy through antenna circuit 81, and where an energy processing circuit is integrated within NFC chip U4 to process the energy provided by antenna circuit 81 and power NFC chip U4 itself, and may also power other devices, such as processor 84, to enable processor 84 to obtain data signals through NFC chip circuit 82.

IN some examples, NFC chip U4 includes a first input pin IN1 and a second input pin IN2, where first input pin IN1 and second input pin IN2 are used to connect antenna circuit 81 to obtain power to power NFC chip U4 and so on.

NFC chip U4 may also include pins for I2C communication, such as an SDA pin for transmitting data signals and an SCL pin for transmitting clock signals.

NFC chip circuit 82 may include a power output pin VOUT that may output a power signal (e.g., a voltage of 3.3V) to power other components. Optionally, the power output pin VOUT is connected to a capacitor (e.g., capacitor C41) to filter the output power signal. Optionally, the power output pin VOUT is connected to a backflow preventing element (such as a diode D6) to prevent signal backflow.

In some examples, NFC chip U4 further includes a power input VCC, which may also be powered by other components inputting a power signal (e.g., a voltage of 3.3V). Optionally, the power input VCC is coupled to a capacitor (e.g., capacitor C51) to filter the input power signal.

In some examples, pin P02 of processor 84 is connected to a power signal through resistor R37, and pin P02 is also connected to ground through capacitor C40. Pin VDD of processor 84 is used to access a power signal (e.g., a 3.3V power signal), pin VDD of processor 84 may also connect a capacitor (e.g., capacitor C43 and capacitor C44 in parallel) to ground. The processor may perform I2C communication with the NFC chip U4 through a pin P03 and a pin P04, where the pin P03 user transmits a clock signal, and the pin P04 is used to transmit a data signal. The processor 84 may control the NFC chip U4 via the pin P05.

In other embodiments, the NFC chip circuit 82 may directly drive the ink screen 20 to update the display content according to the data signal.

In some embodiments, please refer to fig. 5, fig. 5 is a schematic diagram of the energy storage and transformation circuit in the passive driving circuit shown in fig. 2. The power supply circuit 83 may include an energy storage 834 and a transformer circuit 835.

One end of the energy storage 834 is connected to the output end of the antenna circuit 81, the other end of the energy storage 834 is grounded, and the energy storage 834 can store electric energy output by 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.

The input end of the voltage transformation circuit 835 is connected to one end of the energy storage 834, the output end of the voltage transformation circuit 835 is connected to the ink screen 20, and the voltage output by the output end of the voltage transformation circuit 835 is different from the voltage of the energy storage 834.

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 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, eight, or even more capacitors in parallel, as embodiments of the present application are not limited in this regard.

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 84. The processor 84 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 connected between the input terminal of the transformer chip U3 and ground, and the first filter circuit performs a filtering process on 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 voltage transformation circuit 835 further includes a voltage transformation matching circuit, where the voltage transformation matching circuit includes an inductor L1, a resistor R7, a resistor R6, and a capacitor C13, one end of the inductor L1 is connected to the output end of the voltage transformation 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, that is, 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 embodiments, a voltage stabilizing circuit may be further disposed between the energy storage 834 and the voltage transforming circuit 835, and the voltage stabilizing circuit is configured to stabilize the voltage output by the energy storage 834. In some examples, the voltage regulator circuit may include a voltage regulator diode D5. In other examples, the voltage stabilizing circuit may use other voltage stabilizing circuits, and the present embodiment does not limit the voltage stabilizing circuit.

In some examples, processor 84 may control transformer chip U3 via pin P01. For example, the pin P01 outputs the sw_io_2 signal for controlling the enable pin of the transformer chip U3, thereby controlling the transformer chip U3 to start or end operation.

In some embodiments, please refer to fig. 6, fig. 6 is a schematic diagram of a configuration of a gate circuit in the passive driving circuit shown in fig. 2. The power supply circuit further comprises a gating circuit 833, and the gating circuit 833 comprises a current limiting resistor R15 and a second switching tube Q2. A current limiting resistor R15 is connected between the output of the antenna circuit 81 and one end of the energy storage 834. The input end of the second switching tube Q2 is connected to the output end of the antenna circuit 81, the output end of the second switching tube Q2 is connected to one end of the energy storage 834, and the control end of the second switching tube Q2 is connected to the processor 84.

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 84 is connected to the control terminal of the second switching transistor Q2, i.e. the processor 84 can control the switching between slow charging and 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 NFC chip circuit 82 may also obtain electric energy through the antenna circuit 81 and communicate with an external 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 fast, so during fast 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 fast charging, the power supply circuit 83 may cause a large interference to communication. After the NFC chip 82 is in communication with the external device through the antenna 81, if the transmission of the data signal for changing the display content of the ink screen 20 is completed, the processor 84 controls the second switching tube Q2 to be turned on, so that the electric energy of the antenna 81 can directly charge the energy storage 834 without passing through the current limiting resistor R15, i.e. enter into fast charging, and the energy storage 834 can be charged more quickly, and after the energy storage 834 is full 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 the 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 end of the third switching tube Q3 is connected to the control end of the second switching tube Q2, an output end of the third switching tube Q3 is grounded, a control end of the third switching tube Q3 is connected to the processor 84, and the processor 84 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 84 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.

In some embodiments, referring to fig. 3, the NFC chip circuit 82 includes an NFC chip U4 and a second resonant matching circuit 821, and 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, the passive drive circuit further comprises a bluetooth circuit connected to the power supply circuit and the processor, the processor being capable of wirelessly communicating with an external device through the bluetooth circuit. The processor may also communicate wirelessly with external devices via bluetooth circuitry, such as to obtain control commands, transmit data signals to update the display of the ink screen, 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.

In some examples, processor 84 may control gating circuit 833 via pin P06. For example, the pin P06 outputs the sw_io_1 signal for controlling the control terminal of the third switching tube Q3 of the gating circuit, thereby controlling the gating circuit to be turned on or off. For another example, the gating circuit is not provided with the third switching tube Q3, and the pin P06 outputs the sw_io_1 signal for controlling the control terminal of the second switching tube Q2 of the gating circuit, so as to control the gating circuit to be turned on or off.

In some embodiments, please refer to fig. 7, fig. 7 is a schematic diagram of a structure of a panel driving circuit in the passive driving circuit shown in fig. 2. The passive driving circuit further comprises a screen driving circuit, and the screen driving circuit comprises a driving inductor L2, a driving switching tube Q4, a first driving resistor R38, a first driving diode, a second driving diode, a third driving diode, a first driving capacitor and a second driving capacitor.

The driving inductor L2, one end of the driving inductor L2 is connected to the output end of the voltage transformation circuit;

the input end of the driving switch tube Q4 is connected with the other end of the driving inductor L2, and the control end of the driving switch tube Q4 is used for inputting a control signal of the ink screen;

the first driving resistor R38 is connected between the output end of the driving switch tube Q4 and the ground;

the positive electrode of the first driving diode D10 is connected with the other end of the driving inductor L2, and the negative electrode of the first driving diode D10 is connected with the ink screen;

a first driving capacitor C52, where one end of the first driving capacitor C52 is connected to the other end of the driving inductor L2;

a second driving capacitor C54, wherein the second driving capacitor C54 is connected between the cathode of the first driving diode D10 and the ground;

the anode of the second driving diode D9 is connected with the other end of the first driving capacitor C52, and the cathode of the second driving diode D9 is grounded;

and the negative electrode of the third driving diode D8 is connected with the other end of the first driving capacitor C52, and the positive electrode of the third driving diode D8 is connected with the ink screen.

For ease of understanding, the screen driving circuit will be described below. The input voltage of the output end of the voltage transformation circuit can be set as 3.3V according to the requirement, the driving inductance L2, the driving switching tube Q4, the second driving capacitor C54, the first driving diode D10 and the first driving resistor R38 form a basic boost circuit, and the on or off state of the driving switching tube Q4 is controlled by the GDR pin of the ink screen.

When the driving switch Q4 is turned on, the input voltage passes through the driving inductor L2 and then directly returns to GND through the first driving resistor R38, which results in a linear increase of the current through the driving inductor L2, and at this time, the second driving capacitor C54 discharges to the load.

When the driving switching transistor Q4 is turned off, since the current of the driving inductance L2 cannot be suddenly changed instantaneously, the reverse electromotive force Vs is generated on the driving inductance L2 to maintain the passing current unchanged. At this time, the first driving diode D10 is turned on, and after the two voltages of 3.3V and Vs are connected in series, the load is supplied with power at a voltage exceeding 3.3V, and the second driving capacitor C54 is charged, so that the voltage boosting operation on the VGH pin of the ink screen is realized.

Similarly, for the VGL pin of the ink screen, when the driving switch Q4 is turned off, the first driving capacitor C52 is charged, the second driving diode D9 is turned on, the third driving diode D8 is turned off, and the current flows to GND through the second driving diode D9, and ideally, the voltage difference across the first driving capacitor C52 is 3.3v+vs.

When the driving switch Q4 is turned on, the drain of the driving switch Q4 is close to 0V, and since the voltage of the first driving capacitor C52 cannot be suddenly changed, the K-pole potential of the third driving diode D8 can be considered to be- (3.3v+vs), the first driving capacitor C52 is discharged, the second driving diode D9 is turned off, the third driving diode D8 is turned on, and the current flows to the first driving capacitor C52 through the third driving diode D8, thereby realizing the negative voltage "boosting" operation on the VGL pin of the ink screen. The voltages of VGH and VGL may be set according to the type of ink screen, for example VGH may be +15V and VGL may be-15V.

In some embodiments, the panel driving circuit may further include a second driving resistor R39, and the second driving resistor R39 is connected between the control terminal of the driving switching transistor Q4 and the ground.

The screen driving circuit may further include a third driving capacitor C53, the third driving capacitor C53 being connected between the anode of the third driving diode D8 and ground,

the panel driving circuit may further include a fourth driving capacitor C56, and the fourth driving capacitor C56 is connected between the output terminal of the driving switching transistor Q4 and the ground. Alternatively, the fourth driving capacitor C56 may be replaced by a resistor.

The screen driving circuit may further include a fifth driving capacitor connected between one end of the driving inductor L2 and the ground.

It should be noted that, in the passive driving circuit, the power that the NFC chip circuit can provide is smaller, and the power that the power supply circuit can provide is larger, so, compared with the power that the NFC chip circuit supplies power to the ink screen, the passive driving circuit in this embodiment can provide larger power, can drive the ink screen with stronger function, and it can be understood that the ink screen with stronger function can also have larger power consumption. Therefore, the passive driving circuit of this embodiment can drive not only the two-color ink screen but also the three-color, four-color, five-color or more-color ink screen, and also the ink screen with larger size or resolution. The voltage in the NFC chip circuit is generally smaller, such as between 3.3V and 4V, if the voltage is too large, such as 5V, the NFC chip is easy to burn, the voltage of the energy storage in the power supply circuit can be larger, and the voltage can reach 16V and beyondSuch as 18V or 36V. The formula of the capacitance energy storage is W=CU ² The energy stored by the storage capacitor is in direct proportion to the square of the voltage, the voltage of the energy storage in the power supply circuit can reach 16V or higher, and the stored energy is more than ten times and even more than 100 times of the stored energy of the NFC chip, so that the ink screen with stronger function and larger power consumption can be driven.

In some embodiments, referring to fig. 8, fig. 8 is a schematic diagram of a third structure of a passive driving circuit according to an embodiment of the present application. The passive driving circuit 80 further comprises a timer 836 and a controllable switch 85, the timer 836 is connected between the antenna circuit 81 and the power supply circuit 83, the timer 836 may also be connected in the power supply circuit 83, such as the timer 836 is connected between the energy storage 834 and the transformer circuit 835, the timer 836 is connected between the transformer circuit 835 and the ink screen 20, or the timer 836 is connected between the energy storage 834 and the rectifying circuit 832. The controllable switch 85 is connected between the antenna circuit 81 and the NFC chip circuit 82, and the controllable switch 85 may also be connected in the NFC chip circuit 82, for example, between the second resonant matching circuit 821 and the NFC chip.

The controllable switch 85 is turned off by default, that is, the NFC chip in the NFC chip circuit 82 is turned off from the antenna circuit 81, and the NFC chip cannot work. After the antenna circuit 81 obtains the energy, it may supply the power to the timer 836, the timer 836 starts to count, and the timer 836 counts up to a preset time (the preset time may be between 0.5 and 3 seconds, such as 1 second, 2 seconds, etc.), and the timer 836 controls the controllable switch 85 to be turned on, so that the NFC chip 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.

In some examples, after the controllable switch 85 is turned on, the processor 84 enables the transforming signal of the transforming circuit 835, so that the energy storage 834 in the power supply circuit 83 outputs a voltage signal through the transforming circuit 835, the voltage signal can supply power to the processor 84, and at this time, the power supply of the processor 84 can be switched from the NFC chip to the transforming circuit 835. When the power supply circuit 83 is charged quickly, the power supply of the NFC chip is unstable, the processor 84 is switched to supply power to the voltage transformation circuit 835, the voltage transformation circuit 835 is stable in power supply, and the processor 84 can also work stably, so that the abnormal condition 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, referring to fig. 9, fig. 9 is a schematic diagram of a fourth structure of a passive driving circuit according to an embodiment of the present application. The controllable switch may be replaced with a physical switch 86, the physical switch 86 not requiring a timer to be controlled, but being controlled by a user's operation. It will also be appreciated that the physical switch 86 is adapted to be externally triggered to effect on or off. When the physical switch 86 is turned off, the NFC chip cannot work, and at this time, the passive driving circuit 80 basically does not affect the original NFC function or Qi function of the external device, for example, the external device may also perform access control identification or mobile payment by using the NFC technology, or may also wirelessly charge other devices by using the Qi technology. When the physical switch 86 is turned on, the ink screen 20 can work normally, the NFC chip 82 can communicate data with an external device, the power supply 83 can provide greater power, and the processor 84 controls the ink screen 20 to update the display content according to the data signal obtained by the NFC chip 82.

The physical switch can be a toggle switch or a push switch. The toggle switch is used for switching on or off the physical switch through the toggle of a user, and if the toggle rod of the toggle switch is shifted to a first position, the physical switch is switched on, and if the toggle rod of the toggle switch is shifted to a second position, the physical switch is switched off. The push switch is turned on or off by the user's push, for example, one push turns on the physical switch, the next push turns off the physical switch, and the next push turns on the physical switch, thus the cycle is performed. The physical switch may also be other types of physical switches, and the types of physical switches are not limited herein.

The embodiment of the application further provides a mobile phone shell, please refer to fig. 10, fig. 10 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 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 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, the passive drive circuit for driving the ink screen, the passive drive circuit comprising:

an antenna circuit;

2. The passive drive circuit of an ink screen according to claim 1, further comprising a processor, wherein the processor is connected with the NFC chip circuit, and the processor is configured to obtain a data signal sent by an external device through the NFC chip circuit, and drive the ink screen to update display content according to the data signal.

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

4. A passive drive circuit for an ink screen as claimed in claim 3, wherein the voltage transformation circuit comprises:

5. A passive drive circuit for an ink screen as recited in claim 3, wherein the power supply circuit further comprises a gating circuit, the gating circuit comprising:

6. The passive drive circuit of an ink screen of claim 5, wherein the gating circuit further comprises:

7. The passive drive circuit of an ink screen of any of claims 3-6, wherein the power supply circuit further comprises:

8. The passive drive circuit of an ink screen of claim 7, wherein the NFC chip circuit comprises:

an NFC chip;

9. The passive drive circuit of an ink screen of claim 2, further comprising:

10. 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 9.