Ink screen driving circuit
By designing a driving circuit suitable for e-ink screens, the problem of the inapplicability of LCD screen driving experience was solved, achieving more stable and efficient power signal conversion, reducing development costs and improving device reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING DIGITAL CHINA CLOUD COMPUTING CO LTD
- Filing Date
- 2025-03-26
- Publication Date
- 2026-05-05
AI Technical Summary
Existing experience in driving LCD screens is not applicable to e-ink screens, resulting in high development difficulty and cost.
An e-ink screen driver circuit was designed, comprising a motherboard, a power management integrated circuit, a power electronic switch, a first conversion circuit, and a second conversion circuit. The circuit converts the control signal provided by the motherboard into a voltage signal suitable for the e-ink screen and the power signal provided by the power management integrated circuit into a power signal suitable for the e-ink screen. The power electronic switch controls the power supply to the e-ink screen.
It provides a power signal that is more suitable for e-ink screens, reduces development difficulty and cost, improves system stability and reliability, and extends the service life of the device.
Smart Images
Figure CN224203823U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of e-ink screen technology, and in particular to an e-ink screen driving circuit. Background Technology
[0002] With the continuous development of science and technology, electronic devices and their corresponding supporting products are being updated and replaced at an increasingly rapid pace. Electronic screens, as display tools for electronic devices, play an extremely important role in their use. Electronic ink screens, also known as electronic paper display technology, are screens that use electronic ink. Electronic ink is a revolutionary new method and technology for information display; it changes color when powered on and can display changing images.
[0003] Due to the fundamental differences in the implementation principles between e-ink screens and traditional LCD or LED screens, there are also significant differences in their driving methods. Existing experience in driving LCD screens is not applicable to e-ink screens, making the development of e-ink screens more difficult and costly, which significantly hinders their widespread adoption. Utility Model Content
[0004] The main purpose of this invention is to propose an e-ink screen driving circuit, which aims to solve the problem that the existing experience in driving LCD screens is not applicable to e-ink screens.
[0005] To achieve the above objectives, this utility model proposes an e-ink screen driving circuit, including a motherboard, a power management integrated circuit, a power electronic switch, a first conversion circuit, and a second conversion circuit. The motherboard is connected to the first conversion circuit and the second conversion circuit. The power management integrated circuit is linked to the first conversion circuit. The power electronic switch is connected to the second conversion circuit. The first conversion circuit is used to convert the control signal provided by the motherboard into a voltage signal suitable for driving the e-ink screen. The second conversion circuit is used to convert the power signal provided by the power management integrated circuit into a power signal suitable for driving the e-ink screen. The power electronic switch is used to control the power supply to and from the e-ink screen.
[0006] In one embodiment, the first conversion circuit includes a first filter circuit, a synchronous buck converter, and a second filter circuit connected in sequence. The first filter circuit is connected to the power management integrated circuit, and the second filter circuit is connected to the motherboard and the second conversion circuit, respectively.
[0007] In one embodiment, the first filter circuit includes a first capacitor and a second capacitor. A first voltage is input to a first terminal of the first capacitor, and the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is connected to the first terminal of the first capacitor, and the second terminal of the second capacitor is grounded.
[0008] In one embodiment, the second filter circuit includes a third capacitor, a first inductor, a fourth capacitor, a fifth capacitor, and a sixth capacitor. The first terminal of the first capacitor is connected to the synchronous buck converter. The second terminal of the first capacitor is connected to the first terminal of the first inductor. The second terminal of the first inductor is connected to the first terminal of the fourth capacitor. The first terminal of the fourth capacitor is connected to the first terminals of the fifth capacitor and the sixth capacitor. The second terminals of the fourth capacitor, the fifth capacitor, and the sixth capacitor are grounded.
[0009] In one embodiment, the second conversion circuit includes a third filter circuit, a voltage regulator, and a fourth filter circuit connected in sequence. The third filter circuit is connected to the second filter circuit, and the fourth filter circuit is connected to the motherboard and the power electronic switch, respectively.
[0010] In one embodiment, the regulator is a low-dropout linear regulator.
[0011] In one embodiment, the e-ink screen driving circuit further includes a third conversion circuit, which is connected to the first conversion circuit and receives a first voltage.
[0012] In one embodiment, the third conversion circuit includes a DC-DC conversion chip with dual input terminals. The dual input terminals are respectively connected to the power output terminal of the motherboard and the power output terminal of the power management integrated circuit. The DC-DC conversion chip is used to convert the input first voltage into the driving voltage of the e-ink screen and output the first operating voltage through the output terminal of the third conversion circuit.
[0013] In one embodiment, the e-ink screen driving circuit further includes a first control output circuit, the input terminal of which is connected to the output terminal of the third conversion circuit, and the first control output circuit is used to distribute the first operating voltage to different loads.
[0014] In one embodiment, the e-ink screen driving circuit further includes a fourth conversion circuit and a second control output circuit. The fourth conversion circuit is connected to the first conversion circuit. The fourth conversion circuit converts the input first voltage into a second operating voltage. The second control output circuit is used to distribute the second operating voltage to different loads.
[0015] This invention provides a more suitable power signal for driving e-ink screens by employing a motherboard, a power management integrated circuit, a power electronic switch, a first conversion circuit, and a second conversion circuit. This solves the problem that existing experience in driving LCD screens is not applicable to e-ink screens. The first conversion circuit converts the control signal provided by the motherboard into a voltage signal suitable for driving e-ink screens. The second conversion circuit then converts the power signal provided by the power management integrated circuit into a power signal suitable for driving e-ink screens. Finally, the power electronic switch controls the power supply to e-ink screens to provide a suitable power signal. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0017] Figure 1 This is the schematic diagram of the e-ink screen driver circuit module;
[0018] Figure 2 This is the motherboard circuit diagram;
[0019] Figure 3 This is the first conversion circuit diagram;
[0020] Figure 4 This is the second conversion circuit diagram;
[0021] Figure 5 This is the third conversion circuit diagram;
[0022] Figure 6 This is a diagram of a power management integrated circuit.
[0023] Explanation of icon numbers:
[0024] 1. Motherboard; 2. Power management integrated circuit; 3. Power electronic switch; 4. First conversion circuit; 5. Second conversion circuit; 41. First filter circuit; U12. Synchronous buck converter; 42. Second filter circuit; C133. First capacitor; C134. Second capacitor; C132. Third capacitor; L18. First inductor; C135. Fourth capacitor; C136. Fifth capacitor; C137. Sixth capacitor; 51. Third filter circuit; U13. Voltage regulator; 52. Fourth filter circuit; 6. Third conversion circuit; U14. DC-DC converter chip; 7. First control output circuit; 8. Fourth conversion circuit; 9. Second control output circuit.
[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0029] This utility model proposes an e-ink screen driving circuit.
[0030] In the embodiments of this utility model, such as Figure 1 , Figure 2 , Figure 6As shown, the e-ink screen driving circuit includes a motherboard 1, a power management integrated circuit 2, a power electronic switch 3, a first conversion circuit 4, and a second conversion circuit 5. The motherboard 1 is connected to the first conversion circuit 4 and the second conversion circuit 5. The power management integrated circuit 2 is connected to the first conversion circuit 4. The power electronic switch 3 is connected to the second conversion circuit 5. The first conversion circuit 4 is used to convert the control signal provided by the motherboard 1 into a voltage signal suitable for driving the e-ink screen. The second conversion circuit 5 is used to convert the power signal provided by the power management integrated circuit 2 into a power signal suitable for driving the e-ink screen. The power electronic switch 3 is used to control the power supply to and from the e-ink screen.
[0031] This invention provides a more suitable power signal for driving e-ink screens by employing a motherboard 1, a power management integrated circuit 2, a power electronic switch 3, a first conversion circuit 4, and a second conversion circuit 5. This solves the problem that existing experience in driving LCD screens is not applicable to e-ink screens. The first conversion circuit 4 converts the control signal provided by the motherboard 1 into a voltage signal suitable for driving e-ink screens. The second conversion circuit 5 then converts the power signal provided by the power management integrated circuit 2 into a power signal suitable for driving e-ink screens. Finally, the power electronic switch 3 controls the power supply to the e-ink screen to provide a suitable power signal.
[0032] The motherboard 1 is a PS3 board that supports interfaces such as SPI and QSPI; it supports electronic paper screen drivers of models such as EL040EF1, EL073TF1, EL081EF2, EL133UF, and EL315TW1; this embodiment uses a 12V power supply system, which is converted to 3.3V, 5V, ±19V, and ±3.5V to power the PS3 board and each screen. In this embodiment, the power electronic switch 3 is a MOSFET.
[0033] like Figure 3 As shown, the first conversion circuit 4 includes a first filter circuit 41, a synchronous buck converter U12, and a second filter circuit 42 connected in sequence. The first filter circuit 41 is connected to the power management integrated circuit 2, and the second filter circuit 42 is connected to the motherboard 1 and the second conversion circuit 5 respectively.
[0034] The first conversion circuit 4 converts the 12V input voltage to a 5V operating voltage. The first filter circuit 41 filters the voltage provided by the power management integrated circuit 2 at the power input terminal, effectively suppressing high-frequency noise and ripple in the input power supply, ensuring that the input voltage received by the synchronous buck converter U12 is clean and stable. The second filter circuit 42 performs secondary filtering on the voltage at the output terminal of the synchronous buck converter U12, further reducing the noise and ripple of the output voltage, providing high-quality power to the motherboard 1 and the second conversion circuit 5, and ensuring stable system operation. The synchronous buck converter U12 adopts synchronous rectification technology, which is more efficient (typically above 90%) than traditional diode rectification buck circuits, reducing energy loss, reducing heat generation, and extending equipment life.
[0035] The first filter circuit 41 and the second filter circuit 42 work together to ensure the stability and accuracy of the output voltage and reduce the impact of load changes or input voltage fluctuations on the output voltage. The synchronous buck converter U12 dynamically adjusts the output voltage through a feedback control mechanism to ensure that it always remains at the set value.
[0036] The first filter circuit 41 suppresses high-frequency noise from the input power supply, reducing interference to the power management integrated circuit 2 and other circuits. The second filter circuit 42 reduces the impact of switching noise from the synchronous buck converter U12 on the motherboard 1 and the second conversion circuit 5. The second filter circuit 42 is connected to both the motherboard 1 and the second conversion circuit 5, providing independent filtered power supplies for both circuits and reducing mutual interference. This ensures stable operation of the motherboard 1 and the second conversion circuit 5, improving system reliability. The first conversion circuit 4, as an independent module, can be easily integrated into the system, reducing system design complexity and development costs. The synchronous buck converter U12 typically supports a wide input voltage range, adapting to different power management integrated circuit 2 outputs. By adjusting the feedback network of the synchronous buck converter U12, the output voltage can be flexibly set to meet different load requirements. The high efficiency and two-stage filtering design of the synchronous buck converter U12 reduce energy loss and heat generation, extending the lifespan of the equipment.
[0037] The first filter circuit 41 includes a first capacitor C133 and a second capacitor C134. The first terminal of the first capacitor C133 is input with a first voltage, and the second terminal of the first capacitor C133 is grounded. The first terminal of the second capacitor C134 is connected to the first terminal of the first capacitor C133, and the second terminal of the second capacitor C134 is grounded.
[0038] The second filter circuit 42 includes a third capacitor C132, a first inductor L18, a fourth capacitor C135, a fifth capacitor C136, and a sixth capacitor C137. The first terminal of the first capacitor C133 is connected to the synchronous buck converter U12. The second terminal of the first capacitor C133 is connected to the first terminal of the first inductor L18. The second terminal of the first inductor L18 is connected to the first terminal of the fourth capacitor C135. The first terminal of the fourth capacitor C135 is connected to the first terminals of the fifth capacitor C136 and the sixth capacitor C137. The second terminals of the fourth capacitor C135, the fifth capacitor C136, and the sixth capacitor C137 are grounded.
[0039] The first capacitor C133 filters out low-frequency noise and provides some energy storage; the second capacitor C134 filters out high-frequency noise, forming a wideband filter with the first capacitor C133, effectively suppressing high-frequency noise and ripple in the input power supply, ensuring that the input voltage received by the synchronous buck converter U12 is clean and stable. The combination of the first capacitor C133 and the second capacitor C134 smooths the input voltage, reduces the impact of voltage fluctuations on subsequent circuits, improves the working stability of the synchronous buck converter U12, and reduces the impact of sudden input voltage changes on the system. Effective input filtering can be achieved using only two capacitors, reducing circuit complexity and cost. The second filter circuit 42 can achieve multi-stage filtering and reduce output noise. The third capacitor C132 filters out high-frequency switching noise at the output of the synchronous buck converter U12; the first inductor L18 and the capacitors form an LC filter circuit to further filter out high-frequency noise. The fourth capacitor C135, the fifth capacitor C136, and the sixth capacitor C137 are used for filtering in different frequency bands, ensuring the purity of the output voltage, significantly reducing the ripple and noise of the output voltage, and providing high-quality power to the main board 1 and the second conversion circuit 5.
[0040] The design of the first filter circuit 41 and the second filter circuit 42 ensures the purity of the input and output voltages, providing high-quality power to the motherboard 1 and the second conversion circuit 5. The high efficiency of the synchronous buck converter U12, combined with the optimized design of the filter circuit, reduces energy loss and heat generation. It can adapt to different input voltages and load requirements and is suitable for various application scenarios. By reducing noise, improving stability and dynamic response capabilities, it significantly improves the overall performance of the system.
[0041] like Figure 4As shown, the second conversion circuit 5 converts the 5V working voltage to a 3.3V working voltage. The second conversion circuit 5 includes a third filter circuit 51, a voltage regulator U13, and a fourth filter circuit 52 connected in sequence. The third filter circuit 51 is connected to the second filter circuit 42, and the fourth filter circuit 52 is connected to the main board 1 and the power electronic switch 3 respectively.
[0042] The third filter circuit 51 further filters the voltage output from the second filter circuit 42, reducing noise and ripple to ensure a clean and stable input voltage received by the voltage regulator U13. The fourth filter circuit 52 performs final filtering on the voltage output from the voltage regulator U13, further reducing noise and ripple, providing high-quality power to the main board 1 and the power electronic switch 3, and ensuring stable system operation. The voltage regulator U13 dynamically adjusts its output voltage through a feedback control mechanism to ensure it remains at the set value, reducing the impact of input voltage fluctuations or load changes on the output voltage. The third filter circuit 51 and the fourth filter circuit 52 work together to ensure the stability and accuracy of the output voltage. The third filter circuit 51 suppresses high-frequency noise at the input of the voltage regulator U13, reducing interference to the preceding circuit (second filter circuit 42), while the fourth filter circuit 52 reduces high-frequency noise at the output of the voltage regulator U13, reducing interference to the main board 1 and the power electronic switch 3. This improves the system's electromagnetic compatibility (EMC), meets relevant standards, and reduces power supply noise affecting the main board 1 and the power electronic switch 3 through the filtering circuits. The fourth filter circuit 52 is connected to the main board 1 and the power electronic switch 3 respectively, providing independent filtered power to the main board 1 and the power electronic switch 3, reducing mutual interference, ensuring that the main board 1 and the power electronic switch 3 can work stably, and improving system reliability. The voltage regulator U13 usually supports a wide input voltage range and can adapt to different power inputs. By adjusting the feedback network of the voltage regulator U13, the output voltage can be flexibly set to meet different load requirements. The high efficiency of the voltage regulator U13 and the optimized design of the filter circuit reduce energy loss and heat generation, extend the service life of the equipment, and the high-quality power output reduces the system failure rate and improves the reliability of the equipment.
[0043] The voltage regulator U13 is a low dropout regulator (LDO). An LDO can maintain a stable output voltage even when the input voltage is close to the output voltage. LDOs have extremely low output noise and ripple, making them suitable for noise-sensitive applications (such as audio circuits and radio frequency circuits). LDOs can quickly respond to load changes and maintain output voltage stability.
[0044] The e-ink screen driving circuit also includes a third conversion circuit 6, which is connected to the first conversion circuit 4. The third conversion circuit 6 receives a first voltage and converts the 12V power supply voltage into a ±19V operating voltage.
[0045] like Figure 5 As shown, the third conversion circuit 6 includes a DC-DC conversion chip U14. The DC-DC conversion chip U14 has dual input terminals, which are respectively connected to the power output terminal of the motherboard 1 and the power output terminal of the power management integrated circuit 2. The DC-DC conversion chip U14 is used to convert the input first voltage into the driving voltage of the e-ink screen and output the first working voltage through the output terminal of the third conversion circuit 6.
[0046] The third conversion circuit 6 converts the input voltage into a suitable driving voltage for the e-ink screen using the DC-DC converter chip U14, ensuring that the e-ink screen obtains a stable and compliant operating voltage. This conversion not only improves voltage adaptability but also enhances system stability. The DC-DC converter chip U14 efficiently converts the input voltage into the required driving voltage, reducing energy loss and improving the overall system energy efficiency. This is particularly important for battery-powered devices (such as e-book readers), as it can extend battery life. By integrating the DC-DC converter chip U14, the third conversion circuit 6 simplifies the design of the e-ink screen driving circuit, reduces the number of external components, lowers circuit complexity and cost, and improves system integration and reliability. Because the DC-DC converter chip U14 can flexibly adjust the output voltage, the third conversion circuit 6 can adapt to different models or specifications of e-ink screens, enhancing the circuit's versatility and compatibility.
[0047] The e-ink screen driving circuit also includes a first control output circuit 7. The input terminal of the first control output circuit 7 is connected to the output terminal of the third conversion circuit 6. The first control output circuit 7 is used to distribute the first operating voltage to different loads. By distributing the first operating voltage output by the third conversion circuit 6 to different loads, the first control output circuit 7 ensures that each module in the e-ink screen driving circuit can obtain a suitable voltage supply, thus optimizing the voltage distribution efficiency.
[0048] The e-ink screen driving circuit also includes a fourth conversion circuit 8 and a second control output circuit 9. The fourth conversion circuit 8 is connected to the first conversion circuit 4. The fourth conversion circuit 8 converts the input first voltage into a second working voltage. The second control output circuit 9 is used to distribute the second working voltage to different loads. The fourth conversion circuit 8 converts the 12V power supply voltage into a ±3.5V working voltage.
[0049] The second control output circuit 9 distributes the second working voltage output by the fourth conversion circuit 8 to different loads, further realizing the flexible allocation of multiple voltage outputs and meeting the voltage requirements of different loads.
[0050] The first control output circuit 7 and the second control output circuit 9 manage different voltage distributions respectively, avoiding load conflicts or instability problems that may be caused by a single voltage output, thus improving the overall stability and reliability of the system. The design of the first control output circuit 7 and the second control output circuit 9 makes the voltage distribution modular, facilitating circuit design, debugging, and maintenance, while also improving the system's scalability. The multi-voltage output and distribution function allows the circuit to adapt to more complex application scenarios, such as those requiring simultaneous driving of e-ink displays, control chips, and other peripheral devices, enhancing the circuit's applicability and flexibility.
[0051] The first voltage is converted to the second operating voltage by the fourth conversion circuit 8. The circuit can simultaneously provide multiple voltage outputs (such as the first operating voltage and the second operating voltage) to adapt to the voltage requirements of different modules in the e-ink screen driver circuit, thereby enhancing the circuit's versatility and compatibility. By converting the input voltage to the second operating voltage through the fourth conversion circuit 8, and combining it with the distribution function of the second control output circuit 9, energy can be utilized more efficiently, unnecessary losses can be reduced, and the system's energy efficiency can be improved.
[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, this utility model can have various modifications, combinations, and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of the claims of this utility model.
Claims
1. An e-ink screen driving circuit, characterized in that, The system includes a motherboard, a power management integrated circuit, a power electronic switch, a first conversion circuit, and a second conversion circuit. The motherboard is connected to the first conversion circuit and the second conversion circuit. The power management integrated circuit is linked to the first conversion circuit. The power electronic switch is connected to the second conversion circuit. The first conversion circuit is used to convert the control signal provided by the motherboard into a voltage signal suitable for driving the e-ink screen. The second conversion circuit is used to convert the power signal provided by the power management integrated circuit into a power signal suitable for driving the e-ink screen. The power electronic switch is used to control the power supply to and from the e-ink screen.
2. The e-ink screen driving circuit as described in claim 1, characterized in that, The first conversion circuit includes a first filter circuit, a synchronous buck converter, and a second filter circuit connected in sequence. The first filter circuit is connected to the power management integrated circuit, and the second filter circuit is connected to the motherboard and the second conversion circuit, respectively.
3. The e-ink screen driving circuit as described in claim 2, characterized in that, The first filter circuit includes a first capacitor and a second capacitor. The first terminal of the first capacitor is input with a first voltage, and the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is connected to the first terminal of the first capacitor, and the second terminal of the second capacitor is grounded.
4. The e-ink screen driving circuit as described in claim 3, characterized in that, The second filter circuit includes a third capacitor, a first inductor, a fourth capacitor, a fifth capacitor, and a sixth capacitor. The first terminal of the first capacitor is connected to the synchronous buck converter. The second terminal of the first capacitor is connected to the first terminal of the first inductor. The second terminal of the first inductor is connected to the first terminal of the fourth capacitor. The first terminal of the fourth capacitor is connected to the first terminals of the fifth capacitor and the sixth capacitor. The second terminals of the fourth capacitor, the fifth capacitor, and the sixth capacitor are grounded.
5. The e-ink screen driving circuit as described in claim 2, characterized in that, The second conversion circuit includes a third filter circuit, a voltage regulator, and a fourth filter circuit connected in sequence. The third filter circuit is connected to the second filter circuit, and the fourth filter circuit is connected to the motherboard and the power electronic switch, respectively.
6. The e-ink screen driving circuit as described in claim 5, characterized in that, The voltage regulator is a low-dropout linear voltage regulator.
7. The e-ink screen driving circuit as described in claim 2, characterized in that, The e-ink screen driving circuit also includes a third conversion circuit, which is connected to the first conversion circuit and receives a first voltage.
8. The e-ink screen driving circuit as described in claim 7, characterized in that, The third conversion circuit includes a DC-DC conversion chip with dual input terminals. The dual input terminals are respectively connected to the power output terminal of the motherboard and the power output terminal of the power management integrated circuit. The DC-DC conversion chip is used to convert the input first voltage into the driving voltage of the e-ink screen and output the first operating voltage through the output terminal of the third conversion circuit.
9. The e-ink screen driving circuit as described in claim 8, characterized in that, The e-ink screen driving circuit further includes a first control output circuit, the input terminal of which is connected to the output terminal of the third conversion circuit, and the first control output circuit is used to distribute the first operating voltage to different loads.
10. The e-ink screen driving circuit as described in claim 2, characterized in that, The e-ink screen driving circuit further includes a fourth conversion circuit and a second control output circuit. The fourth conversion circuit is connected to the first conversion circuit. The fourth conversion circuit converts the input first voltage into a second operating voltage. The second control output circuit is used to distribute the second operating voltage to different loads.