Passive ink screen drive circuit and display device

Abstract

This application relates to a passive e-ink screen driving circuit and display device. The passive e-ink screen driving circuit supplies power to the source / gate driving circuit and logic circuit of the e-ink screen. The passive e-ink screen driving circuit includes an antenna circuit, an NFC signal power extraction circuit, an energy storage circuit, a transformer circuit, and an NFC communication circuit. The NFC signal power extraction circuit acquires a first electrical energy; the energy storage circuit stores the first electrical energy; the transformer circuit transforms the voltage and supplies power to the source / gate driving circuit; and the NFC communication circuit acquires a second electrical energy and supplies power to the logic circuit. The circuit of this application can provide high-voltage power to the source / gate driving circuit and low-voltage power to the logic circuit. Furthermore, it directly supplies power to the logic circuit using the NFC communication circuit. Simultaneously, the transformer circuit only needs to perform one voltage transformation to meet the high-voltage requirements of the source / gate driving circuit. Compared to traditional driving circuits, this reduces power conversion losses and improves power utilization.

Description

Technical Field

[0001] This application relates to the field of e-ink screen technology, and in particular to a passive e-ink screen driving circuit and display device. Background Technology

[0002] The internal circuitry of an e-ink screen includes source / gate driver circuits and logic circuits. The source / gate driver circuits provide row / column driving voltages to the display dot matrix, hence they are referred to as source and gate signals, respectively. When displaying content, the ink particles in the e-ink cells need to move physically under the influence of an electric field, so the supply voltage for the source and gate signals is generally high, typically ±15V or ±19V. The logic circuits are the data processing circuitry within the e-ink screen, and their supply voltage is generally lower, typically 3.3V or below. In related technologies, e-ink screen manufacturers provide a standard screen driver circuit, which requires only one 3.3V power supply. The driver circuit internally uses boost technology to provide a high-voltage signal to the source / gate driver circuit. In passive power supply technology applications, the common practice is to draw power from an external power source and then use a transformer circuit to reduce the voltage to 3.3V before supplying power to the standard screen driver circuit. Both voltage changes result in energy loss, leading to low energy utilization. Utility Model Content

[0003] This application provides a passive e-ink screen driving circuit, which improves the power utilization rate of the passive e-ink screen driving circuit, thereby at least partially solving the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a passive e-ink display driving circuit is provided for supplying power to the source / gate driving circuit and logic circuit of the e-ink display, the passive e-ink display driving circuit comprising:

[0005] Antenna circuitry, used to acquire radio frequency signals from the environment;

[0006] An NFC signal power-generating circuit, connected to the antenna circuit, is used to obtain first electrical energy based on the radio frequency signal;

[0007] An energy storage circuit is connected to the NFC signal power-drawing circuit to store the first electrical energy;

[0008] A transformer circuit is connected to the energy storage circuit and the source / gate drive circuit. The transformer circuit is used to transform the voltage of the output signal of the energy storage circuit and to supply power to the source / gate drive circuit.

[0009] The NFC communication circuit, connected to the antenna circuit and the logic circuit, is used to acquire second electrical energy based on the radio frequency signal and supply power to the logic circuit.

[0010] Wherein, the voltage of the first electrical energy is greater than the voltage of the second electrical energy.

[0011] According to a second aspect of this application, a passive e-ink screen driving circuit is provided for supplying power to the source / gate driving circuit and logic circuit of the e-ink screen, the passive e-ink screen driving circuit comprising:

[0012] Antenna circuitry, used to acquire radio frequency signals from the environment;

[0013] An NFC signal power-generating circuit, connected to the antenna circuit, is used to obtain first electrical energy based on the radio frequency signal;

[0014] An energy storage circuit is connected to the NFC signal power-drawing circuit to store the first electrical energy;

[0015] A transformer circuit is connected to the energy storage circuit, the source / gate drive circuit, and the logic circuit. The transformer circuit is used to transform the voltage of the output signal of the energy storage circuit and supply power to the source / gate drive circuit and the logic circuit respectively.

[0016] An NFC communication circuit is connected to the antenna circuit and the logic circuit, and the logic circuit communicates with external devices through the NFC communication circuit.

[0017] Optionally, the transformer circuit is connected to the NFC communication circuit, and the transformer circuit is also used to supply power to the NFC communication circuit.

[0018] Optionally, the transformer circuit transforms the voltage of the output signal of the energy storage circuit to output a first power supply signal and a second power supply signal. The first power supply signal is used to supply power to the source / gate drive circuit, and the second power supply signal is used to supply power to the logic circuit.

[0019] Optionally, the transformer circuit includes:

[0020] The first transformer unit is connected to the energy storage circuit and the source / gate drive circuit, and is used to output the first power supply signal.

[0021] The second transformer unit is connected to the energy storage circuit and the logic circuit, and is used to output the second power supply signal.

[0022] Optionally, the second power supply signal is also used to supply power to the NFC communication circuit.

[0023] Optionally, the NFC signal power supply circuit and the NFC communication circuit are integrated into the NFC chip, and the NFC chip is connected to the antenna circuit and the energy storage circuit.

[0024] Optionally, the NFC signal power-gathering circuit includes a rectifier unit, which is used to rectify the radio frequency signal to obtain the first electrical energy. The rectifier unit is connected to the energy storage circuit, which is used to store the rectified first electrical energy.

[0025] Optionally, the NFC signal power supply circuit further includes a current control unit, and the rectifier unit is connected to the energy storage circuit through the current control unit. The current control unit is used to transform the current transmitted to the energy storage circuit.

[0026] According to a third aspect of this application, a display device is provided, including an e-ink screen and a passive e-ink screen driving circuit, wherein the passive e-ink screen driving circuit is connected to the e-ink screen and the passive e-ink screen driving circuit is the aforementioned passive e-ink screen driving circuit.

[0027] In the passive e-ink screen driving circuit of this application embodiment, power is drawn from the NFC radio frequency signal to directly provide high voltage to the source / gate driving circuit and low voltage to the logic circuit of the e-ink screen. Only one voltage conversion is required to meet the high voltage requirements of the screen's source / gate driving. This reduces the cumbersome steps in traditional solutions where the high voltage of the energy storage circuit is first stepped down to the screen driving circuit and then stepped up to obtain the high voltage of the source / gate driving circuit. This reduces power conversion losses, improves power utilization, and can provide sufficient and stable power support for e-ink screens with higher resolution and richer colors, thus extending the device's battery life.

[0028] Secondly, the high and low voltage power supply paths are relatively independent. The ±15V or ±19V high voltage required by the source / gate drive circuit and the 3.3V low voltage of the logic circuit do not interfere with each other. Even if the high voltage end experiences excessive current due to driving the high-resolution screen, it will not affect the logic circuit on the low voltage end. This effectively avoids the problem of interruption during the screen refresh process due to insufficient power supply, ensuring the smoothness and stability of the e-ink screen display.

[0029] Furthermore, the circuit structure design is simpler, reducing the use of multiple transformer circuits in traditional solutions. This not only lowers hardware costs but also reduces the circuit board area, creating conditions for miniaturized and thinner designs. Fewer circuit components reduce the probability of failure, improve the overall circuit reliability and stability, and reduce equipment maintenance costs and repair frequency.

[0030] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0033] Figure 1 This is a schematic diagram of the structure of the first passive e-ink screen driving circuit provided in the exemplary embodiments of this disclosure;

[0034] Figure 2 This is a schematic diagram of the structure of the second passive e-ink screen driving circuit provided in the exemplary embodiments of this disclosure;

[0035] Figure 3 This is a schematic diagram of the structure of the third passive e-ink screen driving circuit provided in the exemplary embodiments of this disclosure;

[0036] Figure 4 This is a schematic diagram of the structure of the fourth passive e-ink screen driving circuit provided in the exemplary embodiments of this disclosure;

[0037] Figure 5 This is a schematic diagram of the structure of the fifth passive e-ink screen driving circuit provided in the exemplary embodiments of this disclosure;

[0038] Figure 6 This is a schematic diagram of the NFC signal power-gathering circuit provided in an exemplary embodiment of this disclosure.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Passive e-ink display driver circuit; 11. Antenna circuit; 12. NFC signal power supply circuit; 121. Rectifier unit; 122. Current control unit; 13. Energy storage circuit; 14. Transformer circuit; 141. First transformer unit; 142. Second transformer unit; 15. NFC communication circuit; 16. NFC chip;

[0041] 2. E-ink display; 21. Source / gate driver circuit; 22. Logic circuit. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0043] According to the first aspect of this application, please refer to Figure 1 A passive e-ink screen driving circuit 1 is provided for supplying power to the source / gate driving circuit 21 and logic circuit 22 of the e-ink screen 2. The passive e-ink screen driving circuit 1 includes an antenna circuit 11, an NFC signal power extraction circuit 12, an energy storage circuit 13, a transformer circuit 14, and an NFC communication circuit 15. The antenna circuit 11 is used to acquire radio frequency signals in the environment; the NFC signal power extraction circuit 12 is connected to the antenna circuit 11 and is used to acquire first electrical energy based on the radio frequency signal; the energy storage circuit 13 is connected to the NFC signal power extraction circuit 12 and stores the first electrical energy; the transformer circuit 14 is connected to the energy storage circuit 13 and the source / gate driving circuit 21, and is used to transform the voltage of the output signal of the energy storage circuit 13 and supply power to the source / gate driving circuit 21; the NFC communication circuit 15 is connected to the antenna circuit 11 and the logic circuit 22, and is used to acquire second electrical energy based on the radio frequency signal and supply power to the logic circuit 22, wherein the voltage of the first electrical energy is greater than the voltage of the second electrical energy.

[0044] Understandably, the antenna circuit 11 first acquires a radio frequency (RF) signal from the environment. This RF signal is transmitted to the NFC signal power supply circuit 12, which acquires first electrical energy based on the RF signal. The first electrical energy is then transmitted to the energy storage circuit 13, which stores the first electrical energy. The energy storage voltage of the energy storage circuit 13 is greater than the voltage of the second electrical energy. The first electrical energy stored in the energy storage circuit 13 is transmitted to the transformer circuit 14, which transforms the voltage of the output signal of the energy storage circuit 13 to meet the power supply requirements of the source / gate driver circuit 21, thus supplying power to the source / gate driver circuit 21. On the other hand, the RF signal acquired by the antenna circuit 11 is also transmitted to the NFC communication circuit 15. The NFC communication circuit 15 acquires second electrical energy based on the RF signal. The second electrical energy supplies power to the NFC communication circuit 15 itself, and the voltage of the second electrical energy is adapted to the power supply requirements of the logic circuit 22. Therefore, the NFC communication circuit 15 directly supplies power to the logic circuit 22. The energy storage circuit 13 may include one or more energy storage capacitors, and the multiple energy storage capacitors may be connected in parallel or partially in parallel and partially in series.

[0045] In this embodiment, the ambient radio frequency signal is acquired using the antenna circuit 11 and the NFC signal power-taking circuit 12 and converted into first electrical energy stored in the energy storage circuit 13. Simultaneously, the second electrical energy is obtained from the radio frequency signal using the NFC communication circuit 15 to directly power the logic circuit 22. The transformer circuit 14 only needs to transform the voltage of the energy storage circuit 13 once to power the source / gate driver circuit 21, reducing the two voltage transformation steps of stepping down and then boosting in the traditional solution, thus reducing energy conversion losses and improving energy utilization. By setting the high-voltage power supply path of the source / gate driver circuit 21 and the low-voltage power supply path of the logic circuit 22 as relatively independent paths, the ±19V high voltage and the 3.3V low voltage do not interfere with each other, avoiding the impact of excessive current at the high-voltage end on the low-voltage end logic circuit 22, ensuring the smoothness and stability of the e-ink screen 2 display. By reducing the use of multiple transformer circuits 14 in the traditional solution, the circuit structure is simplified, hardware costs are reduced, the circuit board area is reduced, and the number of circuit components is reduced, lowering the probability of failure, improving the overall circuit reliability and stability, and reducing equipment maintenance costs and repair frequency. By allowing the energy storage circuit 13 to store energy at a voltage higher than the second energy voltage, the energy loss of the subsequent transformer circuit 14 during the boost process can be reduced. The higher initial energy storage voltage eliminates the need for the transformer circuit 14 to boost the voltage significantly from a lower voltage to ±19V, reducing energy loss during voltage conversion and further improving energy utilization. At the same time, the higher voltage energy storage method also allows the energy storage circuit 13 to store more energy, providing more durable and stable power support for the source / gate drive circuit 21, which is especially suitable for high-resolution, multi-color e-ink screens 2 with high power consumption requirements.

[0046] In some examples, the NFC communication circuit 15 includes a communication chip and peripheral circuitry. The peripheral circuitry may include an MCU, and the communication chip and the MCU may also be integrated into a single chip for communication with external devices.

[0047] According to the second aspect of this application, please refer to Figure 2A passive e-ink screen driving circuit 1 is provided for supplying power to the source / gate driving circuit 21 and logic circuit 22 of the e-ink screen 2. The passive e-ink screen driving circuit 1 includes an antenna circuit 11, an NFC signal power extraction circuit 12, an energy storage circuit 13, a transformer circuit 14, and an NFC communication circuit 15. The antenna circuit 11 is used to acquire radio frequency signals in the environment; the NFC signal power extraction circuit 12 is connected to the antenna circuit 11 and is used to acquire first electrical energy based on the radio frequency signal; the energy storage circuit 13 is connected to the NFC signal power extraction circuit 12 and stores the first electrical energy; the transformer circuit 14 is connected to the energy storage circuit 13, the source / gate driving circuit 21, and the logic circuit 22, and is used to transform the voltage of the output signal of the energy storage circuit 13 to supply power to the source / gate driving circuit 21 and the logic circuit 22 respectively; the NFC communication circuit 15 is connected to the antenna circuit 11 and the logic circuit 22, and the logic circuit 22 communicates with external devices through the NFC communication circuit 15.

[0048] Understandably, in this embodiment, the antenna circuit 11 acquires radio frequency signals from the environment; the NFC signal power-taking circuit 12 acquires first electrical energy based on the radio frequency signal, and then transmits the first electrical energy to the energy storage circuit 13, which stores the first electrical energy; the transformer circuit 14 is connected to the energy storage circuit 13, the source / gate driver circuit 21, and the logic circuit 22, and transforms the voltage of the output signal of the energy storage circuit 13 to output two signals, which power the source / gate driver circuit 21 and the logic circuit 22 respectively; at the same time, the NFC communication circuit 15 is connected to the antenna circuit 11 and the logic circuit 22, and the logic circuit 22 communicates with external devices through the NFC communication circuit 15.

[0049] In this embodiment, by storing the first electrical energy in the energy storage circuit 13 and then transforming the voltage of the output signal of the energy storage circuit 13 by the transformer circuit 14, the source / gate drive circuit 21 and the logic circuit 22 can be powered simultaneously. This reduces the power loss caused by the two voltage transformations in the traditional solution and improves the power utilization rate. The transformer circuit 14 powers both the source / gate drive circuit 21 and the logic circuit 22 simultaneously, which simplifies the circuit structure, reduces the number of components, lowers the hardware cost and the probability of failure, and is conducive to the miniaturization design of the display device.

[0050] Reference Figure 2 In some embodiments, the transformer circuit 14 is connected to the NFC communication circuit 15, and the transformer circuit 14 is also used to supply power to the NFC communication circuit 15.

[0051] In this embodiment, the voltage output from the energy storage circuit 13 is transformed once by the transformer circuit 14, which can simultaneously power the logic circuit 22 and the NFC communication circuit 15. This eliminates the need for the NFC communication circuit 15 to separately obtain power from the radio frequency signal, simplifying the NFC communication circuit 15, making the circuit structure more compact, and reducing hardware costs and the probability of failure. The NFC communication circuit 15 enables communication between the logic circuit 22 and external devices, while the transformer circuit 14 provides unified power to all components, ensuring power stability during communication, reducing communication interruptions due to insufficient power supply, and improving the reliability of data interaction.

[0052] Reference Figure 2 In some embodiments, the transformer circuit 14 transforms the voltage of the output signal of the energy storage circuit 13 to output a first power supply signal and a second power supply signal. The first power supply signal is used to supply power to the source / gate drive circuit 21, and the second power supply signal is used to supply power to the logic circuit 22.

[0053] In some examples, the voltage of the output signal of the energy storage circuit 13 is lower than the supply voltage of the source / gate drive circuit 21, and the transformer circuit 14 boosts the output signal of the energy storage circuit 13 to output the first supply signal; or,

[0054] The voltage of the output signal of the energy storage circuit 13 is higher than the supply voltage of the source / gate drive circuit 21. The transformer circuit 14 steps down the output signal of the energy storage circuit 13 to output the first supply signal.

[0055] Understandably, when the voltage of the output signal of the energy storage circuit 13 is lower than the supply voltage of the source / gate drive circuit 21, the transformer circuit 14 boosts the output signal of the energy storage circuit 13 and outputs the first supply signal to supply power to the source / gate drive circuit 21; when the voltage of the output signal of the energy storage circuit 13 is higher than the supply voltage of the source / gate drive circuit 21, the transformer circuit 14 depresses the output signal of the energy storage circuit 13 and outputs the first supply signal to supply power to the source / gate drive circuit 21.

[0056] In this embodiment, by having the transformer circuit 14 output a first power supply signal through boost or buck processing based on the relationship between the voltage of the output signal of the energy storage circuit 13 and the power supply voltage of the source / gate drive circuit 21, the circuit can adapt to energy storage circuits 13 with different energy storage voltages, enhancing the flexibility and adaptability of the circuit design and meeting the power supply requirements of the e-ink screen 2 in different scenarios. Furthermore, the transformer circuit 14 only requires one boost or buck voltage conversion to power the source / gate drive circuit 21. Compared to the traditional two-voltage conversion scheme, this reduces the power conversion steps, lowers power loss, and improves power utilization.

[0057] In some examples, the energy storage voltage (output signal voltage) of the energy storage circuit 13 can be set higher, thereby storing more energy. The energy storage voltage can be between 10V and 38V, or between 10V and 15V, between 15V and 25V, or between 25V and 38V. For example, the energy storage voltage can be 10V, 12V, 15V, 19V, 20V, 25V, 30V, 38V, etc.

[0058] Reference Figure 2 In some embodiments, the voltage of the output signal of the energy storage circuit 13 is higher than the supply voltage of the logic circuit 22. The transformer circuit 14 steps down the output signal of the energy storage circuit 13 to output a second supply signal, which is used to supply power to the logic circuit 22.

[0059] In this embodiment, by having the energy storage circuit 13 store electrical energy at a voltage higher than the supply voltage of the logic circuit 22, for example, the storage voltage is 10V, 15V, 25V or 36V, and then the transformer circuit 14 steps down the voltage to output a second supply signal to the logic circuit 22. Combined with the power supply of the source / gate drive circuit 21 by the transformer circuit 14, the high and low voltage power supply requirements are met in one voltage conversion process, reducing the loss of multiple voltage conversions in the traditional solution and improving the energy utilization rate. The transformer circuit 14 is responsible for uniformly adapting the supply voltage of the source / gate drive circuit 21 and the logic circuit 22, making the circuit structure more concentrated, reducing the use of components, reducing hardware costs, and facilitating the integrated design of the circuit, which is conducive to the miniaturization of the device.

[0060] Reference Figure 3 and Figure 4 In some embodiments, the transformer circuit 14 includes a first transformer unit 141 and a second transformer unit 142. The first transformer unit 141 is connected to the energy storage circuit 13 and the source / gate drive circuit 21 and is used to output a first power supply signal. The second transformer unit 142 is connected to the energy storage circuit 13 and the logic circuit 22 and is used to output a second power supply signal.

[0061] Understandably, the energy storage circuit 13 stores the first electrical energy. On the one hand, the first transformer unit 141 in the transformer circuit 14 is connected to the energy storage circuit 13 and the source / gate drive circuit 21, and is used to output the first power supply signal to the source / gate drive circuit 21. On the other hand, the second transformer unit 142 is connected to the energy storage circuit 13 and the logic circuit 22, and is used to output the second power supply signal to the logic circuit 22.

[0062] In this embodiment, by setting independent first transformer unit 141 and second transformer unit 142, voltage transformation is performed on the power supply of the source / gate drive circuit 21 and the logic circuit 22, respectively. This makes the voltage transformation process of the two independent, reducing interference between high and low voltage circuits and ensuring the stability of their respective voltage outputs. The first transformer unit 141 and the second transformer unit 142 draw power from the energy storage circuit 13 and perform targeted voltage transformation, eliminating the need for complex voltage regulation, simplifying circuit control logic, and reducing circuit design difficulty. The independent transformer units can perform precise voltage transformation according to the voltage requirements of the source / gate drive circuit 21 and the logic circuit 22, improving the adaptability of voltage output and ensuring that both receive stable and appropriate power.

[0063] Reference Figure 4 and Figure 5 In some embodiments, the NFC signal power supply circuit 12 and the NFC communication circuit 15 are integrated into the NFC chip 16, which is connected to the antenna circuit 11 and the energy storage circuit 13.

[0064] It is understood that the NFC signal power-taking circuit 12 in the NFC chip 16 of this embodiment obtains first electrical energy according to the radio frequency signal and transmits the first electrical energy to the energy storage circuit 13, which stores the first electrical energy; the transformer circuit 14 connects the energy storage circuit 13 and the source / gate drive circuit 21, and after changing the voltage of the output signal of the energy storage circuit 13, it supplies power to the source / gate drive circuit 21 and the logic circuit 22; at the same time, the logic circuit 22 communicates with external devices through the NFC communication circuit 15 in the NFC chip 16.

[0065] In this embodiment, by integrating the NFC signal power supply circuit 12 and the NFC communication circuit 15 into the NFC chip 16, the number of components used is reduced, the circuit structure is made more compact, and the hardware footprint is reduced, which facilitates the miniaturization and thinning of the device. The NFC chip 16 handles power supply and communication functions in a unified manner, simplifying the circuit design process and reducing the difficulty of hardware assembly.

[0066] Reference Figure 6 In some embodiments, the NFC signal power supply circuit 12 includes a rectifier unit 121, which is used to rectify the radio frequency signal to obtain first electrical energy. The rectifier unit 121 is connected to the energy storage circuit 13, which is used to store the rectified first electrical energy.

[0067] It is understandable that the antenna circuit 11 acquires radio frequency signals from the environment, the rectifier unit 121 rectifies the radio frequency signals to acquire first electrical energy, and transmits the rectified first electrical energy to the energy storage circuit 13.

[0068] In this embodiment, the radio frequency signal is rectified by the rectifier unit 121 to obtain the first electrical energy, making the obtained first electrical energy more stable, reducing the impact of fluctuations in the original radio frequency signal on subsequent power supply, facilitating the efficient energy storage of the energy storage circuit 13, and thus ensuring the stability of subsequent power supply to the logic circuit 22, NFC communication circuit 15 and source / gate drive circuit 21, thereby improving the reliability of the entire circuit operation.

[0069] Reference Figure 6 In some embodiments, the NFC signal power supply circuit 12 further includes a current control unit 122. The rectifier unit 121 is connected to the energy storage circuit 13 through the current control unit 122. The current control unit 122 is used to transform the current transmitted to the energy storage circuit 13.

[0070] It is understandable that the antenna circuit 11 acquires radio frequency signals from the environment; the rectifier unit 121 in the NFC signal power supply circuit 12 rectifies the radio frequency signal to obtain the first electrical energy; and the current control unit 122 controls the current transmitted to the energy storage circuit 13 and adjusts the voltage of the energy storage circuit 13.

[0071] In this embodiment, by changing the current transmitted to the energy storage circuit 13 through the current control unit 122, the charging current can be controlled according to the characteristics and requirements of the energy storage circuit 13, ensuring that the energy storage circuit 13 stores electrical energy at a preset voltage, avoiding damage to the energy storage circuit 13 caused by excessive current, extending the service life of the energy storage circuit 13, and improving the reliability of the circuit.

[0072] According to a third aspect of this application, a display device is provided, including an e-ink screen 2 and a passive e-ink screen driving circuit 1, wherein the passive e-ink screen driving circuit 1 is connected to the e-ink screen 2, and the passive e-ink screen driving circuit 1 is the same as described above, having all the beneficial effects of the aforementioned passive e-ink screen driving circuit 1, which will not be repeated here.

[0073] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0074] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0075] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0076] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A passive e-ink screen driving circuit, characterized in that, The passive e-ink screen driving circuit is used to supply power to the source / gate driving circuit and logic circuit of the e-ink screen, and includes: Antenna circuitry, used to acquire radio frequency signals from the environment; An NFC signal power-generating circuit, connected to the antenna circuit, is used to obtain first electrical energy based on the radio frequency signal; An energy storage circuit is connected to the NFC signal power-drawing circuit to store the first electrical energy; A transformer circuit is connected to the energy storage circuit and the source / gate drive circuit. The transformer circuit is used to transform the voltage of the output signal of the energy storage circuit and to supply power to the source / gate drive circuit. The NFC communication circuit, connected to the antenna circuit and the logic circuit, is used to acquire second electrical energy based on the radio frequency signal and supply power to the logic circuit. Wherein, the voltage of the first electrical energy is greater than the voltage of the second electrical energy.

2. A passive e-ink screen driving circuit, characterized in that, The passive e-ink screen driving circuit is used to supply power to the source / gate driving circuit and logic circuit of the e-ink screen, and includes: Antenna circuitry, used to acquire radio frequency signals from the environment; An NFC signal power-generating circuit, connected to the antenna circuit, is used to obtain first electrical energy based on the radio frequency signal; An energy storage circuit is connected to the NFC signal power-drawing circuit to store the first electrical energy; A transformer circuit is connected to the energy storage circuit, the source / gate drive circuit, and the logic circuit. The transformer circuit is used to transform the voltage of the output signal of the energy storage circuit and supply power to the source / gate drive circuit and the logic circuit respectively. An NFC communication circuit is connected to the antenna circuit and the logic circuit, and the logic circuit communicates with external devices through the NFC communication circuit.

3. The passive e-ink screen driving circuit according to claim 2, characterized in that, The transformer circuit is connected to the NFC communication circuit, and the transformer circuit is also used to supply power to the NFC communication circuit.

4. The passive e-ink screen driving circuit according to claim 2, characterized in that, The transformer circuit converts the voltage of the energy storage circuit output signal to output a first power supply signal and a second power supply signal. The first power supply signal is used to supply power to the source / gate drive circuit, and the second power supply signal is used to supply power to the logic circuit.

5. The passive e-ink screen driving circuit according to claim 4, characterized in that, The transformer circuit includes: The first transformer unit is connected to the energy storage circuit and the source / gate drive circuit, and is used to output the first power supply signal. The second transformer unit is connected to the energy storage circuit and the logic circuit, and is used to output the second power supply signal.

6. The passive e-ink screen driving circuit according to claim 4 or 5, characterized in that, The second power supply signal is also used to supply power to the NFC communication circuit.

7. The passive e-ink screen driving circuit according to claim 2, characterized in that, The NFC signal power supply circuit and the NFC communication circuit are integrated into the NFC chip, and the NFC chip is connected to the antenna circuit and the energy storage circuit.

8. The passive e-ink screen driving circuit according to claim 1 or 2, characterized in that, The NFC signal power-gathering circuit includes a rectifier unit, which is used to rectify the radio frequency signal to obtain the first electrical energy. The rectifier unit is connected to the energy storage circuit, which is used to store the rectified first electrical energy.

9. The passive e-ink screen driving circuit according to claim 8, characterized in that, The NFC signal power supply circuit also includes a current control unit. The rectifier unit is connected to the energy storage circuit through the current control unit. The current control unit is used to change the current transmitted to the energy storage circuit.

10. A display device, characterized in that, include: E-ink screen; A passive e-ink screen driving circuit is connected to the e-ink screen, wherein the passive e-ink screen driving circuit is the passive e-ink screen driving circuit according to any one of claims 1-9.

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