Passive drive circuit of ink screen and mobile phone shell

Abstract

The embodiment of the utility model provides a passive driving circuit of an ink screen and a mobile phone shell, the passive driving circuit is used for driving the ink screen, and the passive driving circuit comprises an antenna circuit; the communication circuit is connected with the antenna circuit; the microprocessor is connected with the communication circuit and is in wireless communication with external equipment through the communication circuit and the antenna circuit; the power supply circuit is connected with the antenna circuit so as to convert energy in the environment into electric energy through the antenna circuit; wherein the power supply circuit comprises a matching circuit, a rectifying circuit and an energy storage circuit, the matching circuit is connected with the antenna circuit and outputs first electric energy in a matched mode, the rectifying circuit is connected with the matching circuit and rectifies the first electric energy, the energy storage circuit is connected with the rectifying circuit and stores the rectified first electric energy, and the energy storage circuit is used for being connected with an ink screen. And supplying power to the ink screen when the display content of the ink screen is updated. A battery is not needed, the problem that the ink screen cannot be driven to update the display content after the battery is used up does not exist, and use is more convenient.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a passive driving circuit for an ink screen and a mobile phone case. Background Art

[0002] With the development of society, mobile phones have become an indispensable device in people's daily lives. With the increasing number of mobile phone functions, the use scenarios of mobile phones are also increasing, and the time of using mobile phones is also increasing. At present, mobile phones are generally equipped with mobile phone cases to protect the mobile phones. Some mobile phone cases are provided with patterns to meet the needs of customers. Some mobile phone cases are provided with electronic ink screens, which can change different display contents as needed. However, the electronic ink screens in the related art require built-in batteries, which are inconvenient to use. Utility Model Content

[0003] The embodiments of the present application provide a passive driving circuit for an ink screen and a mobile phone case. The passive driving circuit directly obtains electrical energy from an external device and does not require a battery, making it more convenient to use.

[0004] In a first aspect, an embodiment of the present application provides a passive driving circuit for an ink screen, wherein the passive driving circuit is used to drive the ink screen, and the passive driving circuit includes:

[0005] Antenna circuit;

[0006] A communication circuit connected to the antenna circuit;

[0007] a microprocessor connected to the communication circuit and wirelessly communicating with an external device through the communication circuit and the antenna circuit;

[0008] a power supply circuit connected to the antenna circuit to convert energy in the environment into electrical energy through the antenna circuit;

[0009] Among them, the power supply circuit includes a matching circuit, a rectifier circuit and an energy storage circuit. The matching circuit is connected to the antenna circuit and cooperates to output the first electric energy. The rectifier circuit is connected to the matching circuit and rectifies the first electric energy. The energy storage circuit is connected to the rectifier circuit and stores the rectified first electric energy. The energy storage circuit is used to connect to the ink screen and power the ink screen when the ink screen updates the display content.

[0010] In some embodiments, the power supply circuit further includes:

[0011] The current speed-changing circuit is arranged between the rectifier circuit and the energy storage circuit, and the current speed-changing circuit can change the current transmitted to the energy storage circuit.

[0012] In some embodiments, the current speed-changing circuit has multiple states, and the impedance of the current speed-changing circuit in different states is different to change the current transmitted to the energy storage circuit.

[0013] In some embodiments, the current speed-changing circuit includes a plurality of branches, each of which has a different impedance, and one of the plurality of branches is selectively connected between the rectifier circuit and the energy storage circuit.

[0014] In some embodiments, the current speed-changing circuit includes a plurality of branches, and impedances of different branches are different;

[0015] The processor changes the conduction time of at least one of the plurality of branches to change the current transmitted to the energy storage circuit.

[0016] In some embodiments, at least one of the branches has a switch circuit, and the switch circuit is connected to the microprocessor. The microprocessor can change the opening and closing time of the switch circuit to change the conduction time of the branch where the switch circuit is located.

[0017] In some embodiments, the passive driving circuit further includes:

[0018] A load control circuit is connected between the power supply circuit and the ink screen, and the power supply circuit drives the ink screen through the load control circuit.

[0019] In some embodiments, the power supply circuit is connected to the communication circuit and the microprocessor to supply power to the communication circuit and the microprocessor.

[0020] In some embodiments, the communication circuit includes an NFC chip, the NFC chip cooperates with the antenna circuit to obtain a second electrical energy, and the NFC chip supplies power to the communication circuit through the second electrical energy.

[0021] In some embodiments, the NFC chip supplies power to the microprocessor via the second electrical energy.

[0022] In some embodiments, after the electrical energy of the energy storage circuit reaches an energy threshold, the energy storage circuit supplies power to at least one of the microprocessor and the communication circuit.

[0023] In some embodiments, the power supply circuit further includes:

[0024] A voltage transformer circuit is connected to the energy storage circuit, and the voltage transformer circuit can change the voltage output by the energy storage circuit to adapt to at least one of the ink screen, the microprocessor, and the communication circuit.

[0025] In some embodiments, the antenna circuit includes a universal antenna, and the universal antenna is connected to the power supply circuit and the communication circuit; or

[0026] The antenna circuit includes a first antenna and a second antenna, the first antenna is connected to the power supply circuit, and the second antenna is connected to the communication circuit.

[0027] In a second aspect, an embodiment of the present application further provides a mobile phone case, which includes:

[0028] case;

[0029] An ink screen, mounted on the housing;

[0030] A passive driving circuit is installed in the shell and connected to the ink screen. The passive driving circuit is any one of the passive driving circuits described above.

[0031] In the passive driving circuit of the ink screen of the embodiment of the present application, the antenna circuit can be wirelessly connected to an external device such as a mobile phone, the power supply circuit can obtain electric energy through the antenna circuit, and supply power to the ink screen when the ink screen updates the display content. The passive driving circuit directly obtains electric energy from the external device, and does not need to set a battery. There is no problem of being unable to drive the ink screen to update the display content when the battery runs out, and it is more convenient to use. The power supply circuit includes a matching circuit, a rectifier circuit and an energy storage circuit connected in sequence. The matching circuit and the antenna circuit can cooperate to better obtain the radio frequency signal of the external device. The rectifier circuit can rectify the first electric energy output by the matching circuit, so that the energy storage circuit can store electric energy.

[0032] In addition, the ink screen is powered by the energy storage circuit, and no battery is required, which can reduce the thickness of the passive drive circuit and facilitate the passive drive circuit to be installed in relatively thin products (such as mobile phone cases). The communication circuit can communicate with external devices through the antenna circuit, such as obtaining data signals, and the ink screen can update the display content according to the data signal, and can easily obtain the data signal corresponding to the new image, thereby facilitating the ink screen to update the display content. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0034] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0035] Figure 1 A first structural schematic diagram of a passive driving circuit provided in an embodiment of the present application.

[0036] Figure 2 A second structural schematic diagram of the passive driving circuit provided in an embodiment of the present application.

[0037] Figure 3 for Figure 2 The first structural schematic diagram of the current speed change circuit in the passive drive circuit is shown.

[0038] Figure 4 for Figure 2 The second structural schematic diagram of the current speed change circuit in the passive drive circuit shown.

[0039] Figure 5 for Figure 2 The third structural schematic diagram of the current speed change circuit in the passive drive circuit shown.

[0040] Figure 6 for Figure 2 The fourth structural schematic diagram of the current speed change circuit in the passive drive circuit shown.

[0041] Figure 7 for Figure 2 The fifth structural schematic diagram of the current speed change circuit in the passive drive circuit shown.

[0042] Figure 8 A third structural schematic diagram of the passive driving circuit provided in an embodiment of the present application.

[0043] Fig. 9 A fourth structural schematic diagram of the passive driving circuit provided in an embodiment of the present application.

[0044] Fig.10 A fifth structural schematic diagram of the passive driving circuit provided in an embodiment of the present application.

[0045] Fig.11 A sixth structural schematic diagram of the passive driving circuit provided in an embodiment of the present application.

[0046] Fig.12 A seventh structural schematic diagram of the passive driving circuit provided in an embodiment of the present application.

[0047] Fig.13 This is a schematic diagram of the eighth structure of the passive driving circuit provided in the embodiment of the present application.

[0048] Fig.14 A ninth structural schematic diagram of a passive driving circuit provided in an embodiment of the present application.

[0049] Fig.15A schematic diagram of the structure of a mobile phone case provided in an embodiment of the present application.

[0050] Description of reference numerals:

[0051] 1. Mobile phone case;

[0052] 10. Shell;

[0053] 20. Ink screen;

[0054] 80. Passive driving circuit, 81. Antenna circuit, 812. First antenna, 814. Second antenna, 816. Universal antenna, 82. Communication circuit, 83. Power supply circuit, 831. Matching circuit, 832. Rectification circuit, 833. Current speed change circuit, 834. Energy storage circuit, 835. Voltage conversion circuit, 84. Microprocessor, 85. Load control circuit, 86. Physical switch. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0056] The present application embodiment provides a passive driving circuit for an ink screen. Figure 1 , Figure 1 The first structural diagram of the passive driving circuit provided in the embodiment of the present application is as follows: The passive driving circuit 80 is used to drive the ink screen 20 , and the passive driving circuit 80 includes an antenna circuit 81 , a communication circuit 82 , a microprocessor 84 and a power supply circuit 83 .

[0057] The antenna circuit 81 can be wirelessly connected to an external device such as a mobile phone. The communication circuit 82 is connected to the antenna circuit 81, and the microprocessor 84 is connected to the communication circuit 82. The microprocessor 84 communicates wirelessly with an external device such as a mobile phone through the communication circuit 82 and the antenna circuit 81.

[0058] The power supply circuit 83 is connected to the antenna circuit 81 to convert the energy in the environment into electric energy through the antenna circuit 81. The power supply circuit 83 includes a matching circuit 831, a rectifier circuit 832 and an energy storage circuit 834. The matching circuit 831 is connected to the antenna circuit 81 and cooperates to output the first electric energy. The rectifier circuit 832 is connected to the matching circuit 831 and rectifies the first electric energy. The energy storage circuit 834 is connected to the rectifier circuit 832 and stores the rectified first electric energy. The energy storage circuit 834 is used to connect to the ink screen 20 and power the ink screen 20 when the ink screen 20 updates the display content.

[0059] The power supply circuit 83 is connected to the antenna circuit 81 and can obtain electric energy through the antenna circuit 81 to power the ink screen 20 when the ink screen 20 updates the display content. The passive drive circuit 80 directly obtains electric energy from the external device, and does not need to set a battery. There is no problem that the ink screen 20 cannot be driven to update the display content when the battery runs out, and it is more convenient to use. The power supply circuit 83 includes a matching circuit 831, a rectifier circuit 832 and an energy storage circuit 834 connected in sequence. The matching circuit 831 and the antenna circuit 81 can cooperate to better obtain the radio frequency signal of the external device. The rectifier circuit 832 can rectify the first electric energy output by the matching circuit 831, so that the energy storage circuit 834 can store electric energy.

[0060] In addition, the ink screen 20 is powered by the energy storage circuit 834, and no battery is required, which can reduce the thickness of the passive drive circuit 80 and facilitate the passive drive circuit 80 to be set in a relatively thin product (such as the mobile phone case 1). The microprocessor 84 and the communication circuit 82 can wirelessly communicate with external devices through the antenna circuit 81, such as obtaining data signals, and the ink screen 20 can update the display content according to the data signal, and can easily obtain the data signal corresponding to the new image, thereby facilitating the ink screen 20 to update the display content.

[0061] The matching circuit cooperates with the antenna circuit to output an oscillation wave signal, the rectifier circuit rectifies the oscillation wave signal and outputs a direct current signal, and the energy storage circuit stores the direct current signal.

[0062] In some embodiments, see Figure 2 , Figure 2 A second structural diagram of a passive drive circuit provided in an embodiment of the present application. The power supply circuit 83 also includes a current speed change circuit 833, which is arranged between the rectifier circuit 832 and the energy storage circuit 834. The current speed change circuit 833 can change the current transmitted to the energy storage circuit 834. The current speed change circuit 833 can provide a variety of charging currents, thereby providing a variety of charging circuits to charge the energy storage circuit 834 to meet different needs.

[0063] For example, the current speed-changing circuit 833 can process the electric energy provided by the rectifier circuit 832, thereby providing a first charging current or a second charging current, wherein the first charging current is less than the second charging current, and it can also be understood that the first charging current is a slow charge for the energy storage circuit 834, and the second charging current is a fast charge for the energy storage circuit 834. For another example, the current speed-changing circuit 833 can provide three or more charging currents, each of which is different, to adapt to different usage scenarios.

[0064] In some embodiments, the current speed change circuit 833 has multiple states, and the impedance of the current speed change circuit 833 in different states is different to change the current transmitted to the energy storage circuit 834. By changing the impedance of the current speed change circuit 833 located between the rectifier circuit 832 and the energy storage circuit 834, the current transmitted to the energy storage circuit 834 is changed.

[0065] In some examples, the current speed-changing circuit 833 includes multiple branches, each branch has a different impedance, and one of the multiple branches is selectively connected between the rectifier circuit 832 and the energy storage circuit 834. Different branches have different impedances, and by selecting different branches to be connected between the rectifier circuit 832 and the energy storage circuit 834, the current speed-changing circuit 833 can provide different charging currents.

[0066] In some examples, please combine Figure 3 , Figure 3 for Figure 2 The first structural diagram of the current speed-changing circuit in the passive drive circuit shown. The current speed-changing circuit 833 includes a first branch and a second branch, the first branch includes a first resistor R1, and the second branch includes a first switch K1. When the first branch is connected between the rectifier circuit 832 and the energy storage circuit 834, that is, when the first switch K1 of the second branch is disconnected, the electrical signal output by the rectifier circuit 832 outputs the first current to the energy storage circuit 834 after passing through the first resistor R1. When the second branch is connected between the rectifier circuit 832 and the energy storage circuit 834, that is, when the second switch K1 is turned on, the electrical signal output by the rectifier circuit 832 does not pass through the first resistor R1, but outputs the first current to the energy storage circuit 834 through the branch after the second switch K1 is turned on (at this time, the impedance of the second branch is much smaller than the impedance of the first branch).

[0067] In some examples, the current speed change circuit 833 includes multiple branches, each branch including a resistor and a switch. Figure 4 , Figure 4 for Figure 2 The second structural diagram of the current speed change circuit in the passive drive circuit shown. The multiple branches include a first branch and a second branch, the first branch includes a first resistor R1 and a first switch K1, and the second branch includes a second resistor R2 and a second switch K2. When the first switch K1 is turned on and the second switch K2 is turned off, the electrical signal output by the rectifier circuit 832 outputs the first current to the energy storage circuit 834 after passing through the first resistor R1. When the first switch K1 is turned off and the second switch K2 is turned on, the electrical signal output by the rectifier circuit 832 outputs the first current to the energy storage circuit 834 after passing through the second resistor R2. It can be understood that, please combine Figure 5 , Figure 5 for Figure 2The third structural schematic diagram of the current speed-changing circuit in the passive drive circuit shown in FIG. The current speed-changing circuit 833 may also include more branches, such as a third branch, a fourth branch, etc. Alternatively, in some other examples, one branch may not be provided with a switch but only with a resistor, or one branch may not be provided with a resistor but only with a switch, or one branch may not be provided with a switch but only with a resistor, and another branch may not be provided with a resistor but only with a switch.

[0068] In some other examples, two or more of the multiple branches may be connected between the rectifier circuit 832 and the energy storage circuit 834. For example, please continue to refer to Figure 4 or Figure 5 The current speed-changing circuit 833 includes a plurality of branches, each of which includes a resistor and a switch, such as a first branch consisting of a first resistor R1 and a first switch K1, and a second branch consisting of a second resistor R2 and a second switch K2. In addition to controlling the first switch K1 to be turned on and the second switch K2 to be turned off, and controlling the first switch K1 to be turned off and the second switch K2 to be turned on, the first switch K1 can also be controlled to be turned on and the second switch K2 to be turned on, so that the electrical signal output by the rectifier circuit 832 is output to the energy storage circuit 834 after passing through the first resistor R1 and the second resistor R2 connected in parallel.

[0069] In some examples, the current speed change circuit 833 may also have other circuit structures. Figure 6 , Figure 6 for Figure 2 The fourth structural schematic diagram of the current speed-changing circuit in the passive drive circuit shown. The current speed-changing circuit 833 includes a first resistor R1 and a second resistor R2 connected in series, the two ends of the first resistor R1 are connected to a first switch K1, and the two ends of the second resistor R2 are connected to a second switch K2. Controlling the first switch K1 and the second switch K2 can make the current speed-changing circuit 833 have four states, and the impedances of the four states are respectively the first resistor R1, the second resistor R2, the first resistor R1 and the second resistor R2 connected in series, and no resistance.

[0070] Specifically, the first state is that the first switch K1 is disconnected and the second switch K2 is turned on, so that the impedance of the current speed change circuit 833 is the first resistor R1; the second state is that the first switch K1 is turned on and the second switch K2 is disconnected, so that the impedance of the current speed change circuit 833 is the second resistor R2; the third state is that the first switch K1 and the second switch K2 are both disconnected, so that the impedance of the current speed change circuit 833 is the sum of the first resistor R1 and the second resistor R2 connected in series; the fourth state is that the first switch K1 and the second switch K2 are both turned on, so that the impedance of the current speed change circuit 833 is almost zero. It can also be understood that the current speed change circuit 833 includes four branches, and the components in the four branches can be reused in different branches, thereby changing the impedance of the current speed change circuit 833 between the rectifier circuit 832 and the energy storage circuit 834, that is, changing the charging current for charging the energy storage circuit 834.

[0071] In some other examples, the current speed change circuit 833 may include more resistors and switches connected in parallel with the resistors. The multiple resistors are arranged in series, and each switch is connected in parallel with one of the resistors.

[0072] In some examples, the current variable speed circuit 833 includes a plurality of branches, each branch having a different impedance. The processor 836 changes the conduction time of at least one branch among the plurality of branches to change the current transmitted to the energy storage circuit 834 .

[0073] In some examples, at least one branch has a switching circuit, which is connected to the microprocessor 84. The microprocessor 84 can change the opening and closing time of the switching circuit to change the conduction time of the branch where the switching circuit is located, thereby changing the impedance of the current speed change circuit 833 between the rectifier circuit 832 and the energy storage circuit 834, thereby changing the charging current for charging the energy storage circuit 834.

[0074] For example, please combine Figure 3, the current speed change circuit 833 includes a first branch and a second branch, the first branch includes a first resistor R1, the second branch includes a first switch K1, the first switch K1 is connected in parallel with the first resistor R1, and the microprocessor 84 is connected to the first switch K1 and can control the on or off of the first switch K1. The microprocessor 84 can dynamically adjust the on time of the first switch K1 so that the first branch and the second branch combine to form different impedances. Specifically, the microprocessor 84 can control the on and off time of the first switch K1 through a PWM signal. When the first switch K1 is disconnected, the electrical signal output by the rectifier circuit 832 is output to the storage circuit after passing through the first resistor R1; when the first switch K1 is turned on, the electrical signal output by the rectifier circuit 832 is output to the storage branch after passing through the branch where the first switch K1 is located; the impedance between the rectifier circuit 832 and the storage circuit can be equivalent to the impedance after the first branch and the second branch are integrated. The duty cycle of the PWM signal is different, and the impedance after integration of the first branch and the second branch is also different, so that the current of the current speed change circuit 833 can be adjusted steplessly according to the PWM signal.

[0075] It is understandable that the current speed-changing circuit 833 may also adopt other circuit structures. Figure 7 , Figure 7 for Figure 2 The fifth structural diagram of the current speed-changing circuit in the passive drive circuit is shown. The current speed-changing circuit 833 includes a first branch and a second branch, the first branch includes a first resistor R1 and a first switch K1, and the second branch includes a second resistor R2. The microprocessor 84 can control the on-off time of the first switch K1 through a PWM signal, so that the first branch and the second branch combine to form different impedances. For another example, please combine Figure 6 The current speed-changing circuit 833 includes a first branch and a second branch. The first branch includes a first resistor R1 and a first switch K1. The second branch includes a second resistor R2 and a second switch K2. The microprocessor 84 can control the on-off time of the first switch K1 and the second switch K2 respectively through different PWM signals, so that the first branch and the second branch combine to form different impedances. The current speed-changing circuit 833 can also adopt other circuit structures, as long as at least one branch has a switch, and the microprocessor 84 controls the on-off of the switch through PWM, such as Figures 4 to 6 The embodiment shown.

[0076] It should be noted that the switches in the above embodiments (such as the first switch, the second switch, etc.) can be set as needed. For example, the switch can be a switch tube, the switch tube can be a triode or a field effect tube, etc., and the switch is controlled by a microprocessor. For another example, the switch can be composed of a first switch tube and a second switch tube, the first switch tube is connected to the circuit, the control end of the first switch tube is connected to the second switch tube, and the second switch tube is controlled by a microprocessor to control the conduction or disconnection of the first switch tube. The first switch tube can be a triode or a field effect tube, etc., and the second switch tube can be a diode, a triode or a field effect tube, etc.

[0077] It is understandable that the communication circuit 82 can communicate wirelessly with external devices through the antenna circuit 81, such as establishing a communication connection, authentication, data signal transmission, etc. Because the greater the charging current of the energy storage circuit 83 inside the power supply circuit 83, the greater the interference caused to the communication, at this time, a smaller charging circuit can be provided inside the power supply circuit 83 to charge the energy storage circuit 834. After the microprocessor 84 and the communication circuit 82 complete the communication with the external device through the antenna circuit 81, such as the transmission of the data signal that needs to change the display content of the ink screen 20, a larger charging circuit can be provided inside the power supply circuit 83 to charge the energy storage circuit 834, which can charge the energy storage circuit 834 faster. After the energy storage circuit 834 is full or charged to a certain extent, it can drive the ink screen 20 to update the data signal to update the display content, thereby reducing the waiting time for the user.

[0078] In some embodiments, see Figure 8 , Figure 8 A third structural schematic diagram of the passive driving circuit provided in an embodiment of the present application. The passive driving circuit 80 also includes a load control circuit 85, which is connected between the power supply circuit 83 and the ink screen 20, and the power supply circuit 83 drives the ink screen 20 through the load control circuit 85. The load control circuit 85 can provide a driving signal required to drive the ink screen 20, such as providing one or more driving voltage signals required by the ink screen 20. The load control circuit 85 can also control the ink screen 20, such as controlling the display brightness, display duration, display mode, etc. of the ink screen 20. The load control circuit 85 can adjust the driving signal of the ink screen 20 internally, or it can be controlled by the microprocessor 84 to adjust the driving signal to drive the ink screen 20.

[0079] In some embodiments, see Fig. 9 , Fig. 9A fourth structural diagram of a passive driving circuit provided in an embodiment of the present application. The power supply circuit 83 is connected to the communication circuit 82 and the microprocessor 84 to supply power to the communication circuit 82 and the microprocessor 84. In addition to supplying power to the ink screen 20, the power supply circuit 83 can also supply power to the communication circuit 82 and the microprocessor 84, so that the microprocessor 84 and the communication circuit 82 can communicate wirelessly with an external device, such as NFC wireless communication, Bluetooth wireless communication or other wireless communication.

[0080] In some embodiments, the communication circuit 82 includes an NFC chip, and the NFC chip cooperates with the antenna circuit 81 to obtain the second electrical energy. The NFC chip supplies power to the communication circuit 82 through the second electrical energy.

[0081] The NFC chip integrates an energy processing circuit to process the energy provided by the antenna circuit 81 and convert it into a second electrical energy, thereby powering the NFC chip itself. In some examples, the NFC chip can also power other devices such as the microprocessor 84 through the second electrical energy, so that when the power supply circuit 83 does not power the microprocessor 84 and the communication circuit 82, the microprocessor 84 and the communication circuit 82 can wirelessly communicate with external devices through the antenna circuit 81 to transmit data.

[0082] In some examples, the NFC chip in the communication circuit 82 can obtain power through the antenna circuit 81, and communicate with the microprocessor 84 through the antenna circuit 81 and the external device. At this time, the charging current of the power supply circuit 83 to charge the energy storage circuit 834 is relatively small. Therefore, if the charging current to charge the energy storage circuit 834 is relatively large, the power supply circuit 83 will conduct the power of the antenna circuit 81, and the NFC chip may not be able to obtain enough power to work. Moreover, when the charging current is relatively large, the power supply circuit 83 will cause greater interference to the communication. After the communication circuit 82 completes the communication with the external device through the antenna circuit 81, such as the transmission of the data signal that needs to change the display content of the ink screen 20, the charging current of the power supply circuit 83 to charge the energy storage circuit 834 can be relatively large, so that the energy storage circuit 834 can be charged faster. After the energy storage circuit 834 is full or charged to a certain extent, it can drive the ink screen 20 to update the data signal to update the display content, thereby reducing the waiting time of the user.

[0083] In some embodiments, the NFC chip can power the microprocessor 84 and the communication circuit 82. When the power of the energy storage circuit 834 reaches the energy threshold, the power supply of at least one of the microprocessor 84 and the communication circuit 82 can be switched from the NFC chip power supply to the energy storage circuit 834, and the energy storage circuit 834 can provide more stable power. In some examples, the energy storage circuit 834 can also provide higher power, so that the microprocessor 84 can drive more internal modules at the same time or use a higher operating frequency.

[0084] In some embodiments, the communication circuit 82 can only perform data transmission and cannot perform energy acquisition. The communication circuit 82 may include a modulation circuit, a demodulation circuit, and the like.

[0085] In some embodiments, see Fig.10 , Fig.10 A fifth structural diagram of a passive drive circuit provided in an embodiment of the present application. The power supply circuit 83 also includes a transformer circuit 835, which is connected to the energy storage circuit 834. The transformer circuit 835 can change the voltage output by the energy storage circuit 834 to adapt to at least one of the ink screen 20, the microprocessor 84, and the communication circuit 82. The voltage output by the transformer circuit 835 can be higher or lower than the voltage output by the energy storage circuit 834, so as to adapt to the circuit at the back end. For example, the voltage output by the energy storage circuit 834 is relatively high, and the transformer circuit 835 performs a voltage reduction process on the voltage output by the energy storage circuit 834 to obtain a voltage matching the ink screen 20. The transformer circuit 835 can output multiple voltages with different voltage values, so as to adapt to multiple circuits. For example, the energy storage circuit 834 processes the voltage output by the energy storage circuit 834 and outputs multiple voltages with different voltage values, so as to adapt to the ink screen 20, the microprocessor 84 or other circuits respectively.

[0086] In some examples, the rated voltage of the energy storage circuit 834 can be set higher to store more energy, and the rated voltage can be between 3V-38V, or between 5V-15V, between 15V-25V, or between 25V-38V, such as the rated voltage can be 5V, 8V, 10V, 12V, 15V, 18V, 20V, 25V, 30V, or 38V. The voltage for driving the ink screen 20 does not need to be so high, such as 3.3V is required, and the voltage conversion circuit 835 can step down the high voltage signal stored in the energy storage circuit 834 to form a low voltage signal required to drive the ink screen 20.

[0087] In some embodiments, see Fig.11 , Fig.11 A sixth structural diagram of a passive driving circuit provided in an embodiment of the present application. Antenna circuit 81 includes a universal antenna, which is connected to power supply circuit 83 and communication circuit 82. Power supply circuit 83 and communication circuit 82 share a common antenna, power supply circuit 83 obtains electrical energy through the universal antenna, and communication circuit 82 communicates through the universal antenna. In some examples, communication circuit 82 can also obtain electrical energy through the universal antenna. In some examples, communication circuit 82 cannot obtain energy through the universal antenna.

[0088] In some embodiments, see Fig.12 , Fig.12The seventh structural diagram of the passive driving circuit provided in the embodiment of the present application. The antenna circuit 81 includes a first antenna 812 and a second antenna 814, the first antenna 812 is connected to the power supply circuit 83, and the second antenna 814 is connected to the communication circuit 82. The power supply circuit 83 and the communication circuit 82 are respectively connected to different antennas, which can reduce the interference between the power supply circuit 83 and the communication circuit 82. In some examples, the communication circuit 82 can also obtain power and data communication through the second antenna 814. In some examples, the communication circuit 82 cannot obtain energy through a general antenna and can only communicate data through the antenna circuit 81.

[0089] Understandably, Fig.11 or Fig.12 In the illustrated embodiment, the voltage conversion circuit 835 can also power at least one of the communication circuit 82 and the microprocessor 84. For example, the communication circuit 82 cannot obtain power through the antenna circuit, and the voltage conversion circuit 835 supplies power to at least one of the communication circuit 82 and the microprocessor 84. For another example, the NFC chip of the communication circuit 82 can obtain power through the antenna circuit. In some cases, the power supply of at least one of the communication circuit 82 and the microprocessor 84 is switched from the NFC chip to the voltage conversion circuit 835. The microprocessor 84 can control the load control circuit 85, such as controlling the power output, duration, output start or cutoff, etc. of the load control circuit 85.

[0090] In some embodiments, the energy storage circuit 834 may include one or more energy storage capacitors, and multiple energy storage circuits 834 may be connected in parallel or partially in parallel and partially in series.

[0091] It should be noted that in the passive driving circuit 80, the NFC chip in the communication circuit 82 can provide less electrical energy, and the power supply circuit 83 can provide more electrical energy. Therefore, compared with the related art of powering the ink screen 20 through the communication circuit 82, the passive driving circuit 80 in this embodiment can provide greater electrical energy and can drive a more powerful ink screen 20. It can be understood that the more powerful the ink screen 20 is, the greater the power consumption will be. Therefore, the passive driving circuit 80 of this embodiment can not only drive a two-color ink screen 20, but also drive a three-color, four-color, five-color or more-color ink screen 20, and can also drive an ink screen 20 with a larger size or a larger resolution. Among them, the voltage in the communication circuit 82 is generally small, such as between 3.3V-4V. If the voltage is too large, such as 5V, it is easy to burn the NFC chip. The voltage of the energy storage circuit 834 in the power supply circuit 83 can be larger, such as 18V or 25V or 36V. The formula for capacitor storage energy is W=CU 2The energy stored in the storage capacitor is proportional to the square of its voltage. The voltage of the energy storage circuit 834 in the power supply circuit 83 can reach 16V or higher. The energy stored in it is more than ten times the energy stored in the NFC chip, and can even exceed 100 times. Therefore, it can drive the ink screen 20 with more powerful functions and higher power consumption.

[0092] In some embodiments, see Fig.13 , Fig.13 The eighth structural diagram of the passive drive circuit provided in the embodiment of the present application. The passive drive circuit 80 also includes a physical switch 86, which is connected between the antenna circuit 81 and the communication circuit 82, and the physical switch 86 is controlled by the user's operation. It can also be understood that the physical switch 86 is used to be externally triggered to achieve conduction or disconnection. When the physical switch 86 is disconnected, the communication circuit 82 cannot work. At this time, the passive drive circuit 80 basically does not affect the original NFC function or Qi function of external devices such as mobile phones. For example, external devices can also use NFC technology for access control identification or mobile payment, etc., and can also use Qi technology to wirelessly charge other devices. When the physical switch 86 is turned on, the communication circuit 82 can work normally, and the communication circuit 82 can communicate data with external devices, such as transmitting data information of the ink screen 20 to update the display content.

[0093] In some embodiments, see Fig.14 , Fig.14 The ninth structural diagram of the passive driving circuit provided in the embodiment of the present application. The physical switch 86 is connected between the antenna circuit 81 and the power supply circuit 83. When the physical switch 86 is disconnected, the power supply circuit 83 cannot work. If the communication circuit 82 cannot obtain electrical energy through the antenna circuit 81, the entire passive driving circuit 80 cannot work; if the communication circuit 82 can obtain electrical energy through the antenna circuit 81, the power supply circuit 83 cannot work, and the communication circuit 82 and the microprocessor 84 can work. When the physical switch 86 is turned on, the power supply circuit 83 can work normally, and the circuit powered by the power supply circuit 83 can also work normally.

[0094] In some examples, the power supply circuit 83 and the communication circuit 82 share an antenna, and the physical switch 86 can be set at the output end of the antenna, that is, when the physical switch 86 is disconnected, the power supply circuit 83 and the communication circuit 82 are disconnected from the antenna, and when the physical switch 86 is turned on, the power supply circuit 83 and the communication circuit 82 are connected to the antenna.

[0095] In some examples, the power supply circuit 83 and the communication circuit 82 share an antenna, and the physical switch 86 may include two, one physical switch 86 is set between the antenna and the power supply circuit 83, and the other physical switch 86 is set between the antenna and the communication circuit 82, and the two physical switches 86 are controlled separately.

[0096] In some examples, the antenna circuit 81 includes a first antenna 812 and a second antenna 814, a physical switch 86 is set between the power supply circuit 83 and the first antenna 812, and a physical switch 86 is set between the communication circuit 82 and the second antenna 814, and the two physical switches 86 are controlled separately. Of course, it is also possible to set a physical switch 86 between the power supply circuit 83 and the first antenna 812, and not set a physical switch 86 between the communication circuit 82 and the second antenna 814; or not set a physical switch 86 between the power supply circuit 83 and the first antenna 812, and set a physical switch 86 between the communication circuit 82 and the second antenna 814.

[0097] The physical switch 86 may be a toggle switch or a push switch. The toggle switch is turned on or off by the user, such as when the lever of the toggle switch is turned to the first position, the physical switch 86 is turned on, and when the lever of the toggle switch is turned to the second position, the physical switch 86 is turned off. The push switch is turned on or off by the user's pressing, such as when one pressing turns on the physical switch 86, the next pressing turns off the physical switch 86, and the next pressing turns on the physical switch 86, and so on. The physical switch 86 may also be other types of physical switches 86, and the type of the physical switch 86 is not limited here.

[0098] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict. For example, Figures 8 to 14 In the embodiments shown, both may include Figures 2 to 6 The current speed changing circuit shown. For another example, Figure 2 , Figure 8 , Fig. 9 , Fig.13 and Fig.14 In the embodiments shown, both may include Fig.10 The transformer circuit shown. For another example, Figure 2 , Fig. 9 , Fig.10 , Fig.13 and Fig.14 In the embodiments shown, both may include Fig.10 The load control circuit shown. For another example, Figures 2 to 14 In the embodiments shown, both may include Fig.13 or Fig.14 Physical switch shown.

[0099] The present application also provides a mobile phone case. Fig.15 , Fig.15A schematic diagram of the structure of a mobile phone case provided in an embodiment of the present application. The mobile phone case 1 includes a housing 10, an ink screen 20 and a passive driving 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. The passive driving circuit 80 can be the passive driving circuit 80 in any of the above embodiments, which will not be described in detail here.

[0100] In some embodiments, the housing 10 can be mounted on a mobile phone to protect the mobile phone. In other embodiments, the housing 10 can be a rear shell of the mobile phone.

[0101] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0102] The passive driving circuit of the ink screen and the mobile phone case provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A passive driving circuit for an ink screen, characterized in that: The passive driving circuit is used to drive the ink screen, and the passive driving circuit includes: Antenna circuit; A communication circuit connected to the antenna circuit; a microprocessor connected to the communication circuit and wirelessly communicating with an external device through the communication circuit and the antenna circuit; a power supply circuit connected to the antenna circuit to convert energy in the environment into electrical energy through the antenna circuit; Among them, the power supply circuit includes a matching circuit, a rectifier circuit and an energy storage circuit. The matching circuit is connected to the antenna circuit and cooperates to output the first electric energy. The rectifier circuit is connected to the matching circuit and rectifies the first electric energy. The energy storage circuit is connected to the rectifier circuit and stores the rectified first electric energy. The energy storage circuit is used to connect to the ink screen and power the ink screen when the ink screen updates the display content.

2. The passive driving circuit of the ink screen according to claim 1, characterized in that: The power supply circuit further includes: The current speed-changing circuit is arranged between the rectifier circuit and the energy storage circuit, and the current speed-changing circuit can change the current transmitted to the energy storage circuit.

3. The passive driving circuit of the ink screen according to claim 2, characterized in that: The current speed-changing circuit has multiple states, and the impedance of the current speed-changing circuit in different states is different so as to change the current transmitted to the energy storage circuit.

4. The passive driving circuit of the ink screen according to claim 3, characterized in that: The current speed-changing circuit includes a plurality of branches, each of which has a different impedance, and one of the plurality of branches is selectively connected between the rectifier circuit and the energy storage circuit.

5. The passive driving circuit of the ink screen according to claim 3, characterized in that: The current speed-changing circuit includes a plurality of branches, and impedances of different branches are different; The processor changes the conduction time of at least one of the plurality of branches to change the current transmitted to the energy storage circuit.

6. The passive driving circuit of the ink screen according to claim 2, characterized in that: The current speed-changing circuit includes a plurality of branches, at least one of which has a switch circuit, and the switch circuit is connected to the microprocessor. The microprocessor can change the opening and closing time of the switch circuit to change the conduction time of the branch where the switch circuit is located.

7. The passive driving circuit of the ink screen according to claim 1, characterized in that: The passive driving circuit also includes: A load control circuit is connected between the power supply circuit and the ink screen, and the power supply circuit drives the ink screen through the load control circuit.

8. The passive driving circuit of the ink screen according to claim 1, characterized in that: The power supply circuit is connected to the communication circuit and the microprocessor to supply power to the communication circuit and the microprocessor.

9. The passive driving circuit of the ink screen according to claim 1, characterized in that: The communication circuit includes an NFC chip, the NFC chip cooperates with the antenna circuit to obtain a second electric energy, and the NFC chip supplies power to the communication circuit through the second electric energy.

10. The passive driving circuit of the ink screen according to claim 9, characterized in that: The NFC chip supplies power to the microprocessor through the second electrical energy.

11. The passive driving circuit of the ink screen according to claim 10, characterized in that: After the electric energy of the energy storage circuit reaches an energy threshold, the energy storage circuit supplies power to at least one of the microprocessor and the communication circuit.

12. The passive driving circuit of the ink screen according to any one of claims 1 to 11, characterized in that: The power supply circuit further includes: A voltage transformer circuit is connected to the energy storage circuit, and the voltage transformer circuit can change the voltage output by the energy storage circuit to adapt to at least one of the ink screen, the microprocessor, and the communication circuit.

13. The passive driving circuit of the ink screen according to any one of claims 1 to 11, characterized in that: The antenna circuit includes a universal antenna, and the universal antenna is connected to the power supply circuit and the communication circuit; or The antenna circuit includes a first antenna and a second antenna, the first antenna is connected to the power supply circuit, and the second antenna is connected to the communication circuit.

14. A mobile phone case, characterized in that: include: case; An ink screen, mounted on the housing; A passive driving circuit is installed in the shell and connected to the ink screen. The passive driving circuit is the passive driving circuit described in any one of claims 1 to 13.

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