Adaptive power management circuit, method, and display device

Abstract

The application provides an adaptive power management circuit, method and display device, and belongs to the technical field of power supply circuits. An energy storage switching circuit converts a power supply voltage into a front-stage positive voltage and a front-stage negative voltage. A voltage stabilizing circuit respectively stabilizes the front-stage positive voltage and the front-stage negative voltage to obtain a positive power supply voltage and a negative power supply voltage. A detection arbitration circuit detects a positive power supply voltage difference and a negative power supply voltage difference, and determines a time-sharing control signal according to the positive power supply voltage difference and the negative power supply voltage difference. A control module determines a switching signal according to the time-sharing control signal, so that the energy storage switching circuit adjusts the time-sharing adjustment proportion of the front-stage positive voltage and the front-stage negative voltage according to the switching signal, dynamic adjustment of the positive power supply voltage and the negative power supply voltage of the back stage can be realized, the stability of the positive power supply voltage and the negative power supply voltage is ensured, the situation of dynamic change of the load is coped with, the drop state is avoided when the picture is dynamically switched, and the normal display of the display panel is ensured.

Description

Technical Field

[0001] This application belongs to the field of power supply circuit technology, and in particular relates to an adaptive power management circuit, method, and display device. Background Technology

[0002] With the widespread adoption of mobile terminals and wearable devices, Active Matrix Organic Light Emitting Diode (AMOLED) display panels are widely used due to their high contrast, wide color gamut, and low power consumption. AMOLED pixel driving circuits require a set of highly stable driving power supplies with opposite polarities: the positive potential of the electro-luminescence voltage drain device (ELVDD, also known as the positive power supply) and the negative potential of the electro-luminescence substrate (ELVSS, also known as the negative power supply), to provide precise pixel bias current.

[0003] However, in traditional technology, as the displayed content changes dynamically, the current demand of the ELVDD end often fluctuates drastically with the screen brightness (for example, when displaying a high-brightness screen), while the ELVSS end is responsible for the return current. There is a significant difference in the load current between the two, which leads to a voltage drop state when the screen dynamically switches, causing abnormal display of the AMOLED display panel. Summary of the Invention

[0004] The purpose of this application is to provide an adaptive power management circuit, method, and display device, which aims to solve the problem of voltage drop during dynamic screen switching in conventional technology.

[0005] This application provides an adaptive power management circuit, including: Energy storage switching circuit is used to convert the input power supply voltage into the positive voltage and negative voltage of the preceding stage; A voltage regulator circuit, connected to the energy storage switch circuit, is used to regulate the positive voltage and the negative voltage of the preceding stage respectively to obtain a positive power supply voltage and a negative power supply voltage. An arbitration detection circuit, connected to the voltage regulator circuit, is used to detect the positive power supply voltage difference between the positive voltage of the preceding stage and the positive power supply voltage, and to detect the negative power supply voltage difference between the negative voltage of the preceding stage and the negative power supply voltage, and to determine the time-division control signal based on the positive power supply voltage difference and the negative power supply voltage difference. A control module, connected to the detection arbitration circuit, is used to determine the switching signal based on the time-division control signal; The energy storage switch circuit is connected to the control module and is also used to adjust the time-division adjustment ratio of the positive voltage and the negative voltage of the preceding stage according to the switch signal, so as to adjust the positive power supply voltage and the negative power supply voltage.

[0006] In some embodiments, the detection arbitration circuit includes: A negative terminal voltage difference detection module, connected to the voltage regulator circuit, is used to detect the negative power supply voltage difference; A positive terminal voltage difference detection module, connected to the voltage regulator circuit, is used to detect the positive power supply voltage difference; The differential pressure arbitration module is connected to the negative terminal differential pressure detection module and the positive terminal differential pressure detection module, and is used to determine the time-sharing control signal based on the positive power supply voltage difference and the negative power supply voltage difference; The differential pressure arbitration module is also connected to the control module and is used to output the time-sharing control signal to the control module.

[0007] In some embodiments, the voltage regulator circuit includes: A negative voltage regulator module, connected to the energy storage switch circuit, is used to regulate the negative voltage of the preceding stage to obtain a negative power supply voltage; The negative terminal voltage difference detection module is connected to the input and output terminals of the negative terminal voltage regulator module, and is used to obtain the negative voltage of the preceding stage and the negative power supply voltage, and determine the negative power supply voltage difference based on the negative voltage of the preceding stage and the negative power supply voltage. A positive voltage regulator module is connected to the energy storage switch circuit and is used to regulate the positive voltage of the preceding stage to obtain a positive power supply voltage. The positive terminal voltage difference detection module is connected to the input and output terminals of the positive terminal voltage regulator module, and is used to obtain the positive voltage of the preceding stage and the positive power supply voltage, and determine the positive power supply voltage difference based on the positive voltage of the preceding stage and the positive power supply voltage.

[0008] In some embodiments, the differential pressure arbitration module includes: The minimum value selection module is connected to the negative terminal voltage difference detection module and the positive terminal voltage difference detection module, and is used to determine the minimum voltage difference between the negative power supply voltage difference and the positive power supply voltage difference. The duty cycle adjustment module, connected to the minimum value selection module, is used to generate a square wave pulse signal based on the minimum voltage difference, the reference voltage, and the sawtooth wave signal, and send the square wave pulse signal to the control module; wherein, the reference voltage is determined based on the safety threshold of the voltage regulator circuit; A priority selection module, connected to the negative terminal differential pressure detection module and the positive terminal differential pressure detection module, is used to send a priority signal to the control module based on the negative power supply voltage difference and the positive power supply voltage difference. The control module is connected to the duty cycle adjustment module and the priority selection module, and is used to determine the switching signal based on the square wave pulse signal and the priority signal; wherein, the time-division control signal includes the square wave pulse signal and the priority signal.

[0009] In some embodiments, the negative end differential pressure detection module includes: A first resistor, the first end of which is connected to the input terminal of the negative terminal voltage regulator module; A first operational amplifier, wherein the inverting input terminal of the first operational amplifier is connected to the second terminal of the first resistor; The second resistor has its first end connected to the first end of the first resistor, and its second end connected to the output terminal of the first operational amplifier. The output terminal of the first operational amplifier outputs the negative power supply voltage difference. The third resistor has its first end connected to the output terminal of the negative terminal voltage regulator module, and its second end grounded. A fourth resistor, the first end of which is connected to the first end of the third resistor, and the second end of which is connected to the non-inverting input of the first operational amplifier.

[0010] In some embodiments, the minimum value selection module includes: The second operational amplifier has its non-inverting input connected to the output of the positive terminal voltage difference detection module to obtain the positive power supply voltage difference. The first diode, with its cathode connected to the output terminal of the second operational amplifier; The fifth resistor has a first end used to obtain the supply voltage, and a second end connected to the anode of the first diode and the inverting input of the second operational amplifier. The third operational amplifier has its inverting input connected to the second terminal of the fifth resistor, and its non-inverting input connected to the output terminal of the negative terminal voltage difference detection module, for obtaining the negative power supply voltage difference. The second diode has its cathode connected to the output terminal of the third operational amplifier, and its anode connected to the second terminal of the fifth resistor.

[0011] In some embodiments, the duty cycle adjustment module includes: A fourth operational amplifier, wherein the non-inverting input terminal of the fourth operational amplifier is used to obtain the reference voltage, and the inverting input terminal of the fourth operational amplifier is connected to the second terminal of the fifth resistor to obtain the minimum voltage difference; The sixth resistor, the first end of which is connected to the inverting input terminal of the fourth operational amplifier; A first capacitor, the first end of which is connected to the second end of the sixth resistor, and the second end of which is connected to the output of the fourth operational amplifier; The fifth operational amplifier has its non-inverting input connected to the output of the fourth operational amplifier, its inverting input used to acquire a sawtooth wave, and its output used to output the square wave pulse signal.

[0012] In some embodiments, the priority selection module includes: A sixth operational amplifier is provided, wherein the non-inverting input of the sixth operational amplifier is connected to the output of the positive terminal voltage difference detection module to obtain the positive power supply voltage difference, the inverting input of the sixth operational amplifier is connected to the output of the negative terminal voltage difference detection module to obtain the negative power supply voltage difference, and the output of the sixth operational amplifier is used to output the priority signal.

[0013] This application provides an adaptive power management method, including: The input power supply voltage is converted into a positive voltage and a negative voltage of the preceding stage through an energy storage switching circuit; The positive voltage and the negative voltage of the preceding stage are regulated by a voltage regulator circuit to obtain a positive power supply voltage and a negative power supply voltage. The arbitration circuit detects the positive power supply voltage difference between the positive voltage of the preceding stage and the positive power supply voltage, as well as the negative power supply voltage difference between the negative voltage of the preceding stage and the negative power supply voltage, and determines the time-division control signal based on the positive power supply voltage difference and the negative power supply voltage difference. The time-sharing control signal is acquired by the control module, and the switching signal is determined based on the time-sharing control signal; The switching signal is obtained through the energy storage switching circuit, and the time-division adjustment ratio of the positive voltage and the negative voltage of the preceding stage is dynamically adjusted according to the switching signal to regulate the positive power supply voltage and the negative power supply voltage.

[0014] This application provides a display device including any of the adaptive power management circuits described in the above embodiments.

[0015] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: By detecting the positive and negative power supply voltage differences through an arbitration circuit, the input and output voltages of the voltage regulator circuit can be simultaneously fed back. This allows for real-time reflection of the circuit's operating status, overcoming the limitations of traditional technologies that rely solely on output voltage feedback. The positive power supply voltage difference reflects the voltage differential state of the positive power supply channel and also indicates changes in the load connected to the positive power supply voltage ELVDD. Similarly, the negative power supply voltage difference reflects the voltage differential state of the negative power supply channel and also indicates changes in the load connected to the negative power supply voltage ELVSS. Based on these voltage differences, the arbitration circuit can determine the voltage differential state between the two power supply channels and, consequently, the changes in the load.

[0016] The detection arbitration circuit determines a time-sharing control signal based on the positive and negative power supply voltage differences and sends it to the control module. The control module determines a switching signal based on the time-sharing control signal, enabling the energy storage switching circuit to adjust the time-sharing adjustment ratio of the preceding positive and negative voltages. This redistributes the preceding positive and negative voltages to address changes in the voltage difference between the two power supply channels. Therefore, after receiving the switching signal from the control module, the energy storage switching circuit dynamically adjusts the time-sharing adjustment ratio of the preceding positive and negative voltages, achieving dynamic adjustment of the subsequent positive power supply voltage ELVDD and negative power supply voltage ELVSS. This ensures the stability of ELVDD and ELVSS to cope with dynamic load changes. Thus, the adaptive power management circuit provided in this application achieves highly efficient dynamic energy scheduling, ensuring the stability of the positive and negative power supply voltages ELVDD and ELVSS output from each channel, preventing voltage drops during dynamic screen switching, and ensuring the normal display of the AMOLED display panel. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies 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.

[0018] Figure 1 Schematic diagrams of adaptive power management circuits provided in some embodiments of this application; Figure 2 Connection schematic diagrams of the power input circuit in some embodiments provided in this application; Figure 3 The connection diagrams of the detection arbitration circuit and the voltage regulator circuit in some embodiments provided in this application; Figure 4The circuit structure diagram of the differential pressure arbitration module is provided in some embodiments of this application; Figure 5 A schematic diagram of the circuit structure of the control module and the energy storage switch circuit in some embodiments provided in this application; Figure 6 The circuit structure diagram of the negative terminal differential pressure detection module is provided in some embodiments of this application; Figure 7 The circuit structure diagram of the minimum value selection module in some embodiments provided in this application; Figure 8 The circuit structure diagram of the duty cycle adjustment module in some embodiments provided in this application; Figure 9 The circuit structure diagram of the priority selection module in some embodiments provided in this application; Figure 10 The circuit structure diagrams of the digital-to-analog conversion module and the digital logic module in some embodiments provided in this application; Figure 11 Connection diagrams of digital logic modules and timing controllers in some embodiments provided in this application; Figure 12 Connection schematic diagrams of digital logic modules and display driver integrated circuits in some embodiments provided in this application; Figure 13 A schematic diagram of the circuit structure of the positive terminal voltage regulator module in some embodiments provided in this application; Figure 14 The following is a flowchart illustrating the steps of the adaptive power management method in some embodiments provided in this application. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, 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 with "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, in the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items that have substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or order of execution, and that "first" and "second" do not necessarily imply difference.

[0023] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between the related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0024] Please see Figure 1 This application provides an adaptive power management circuit 100. The adaptive power management circuit 100 includes a control module 110, an energy storage switch circuit 120, a voltage regulator circuit 20, and a detection and arbitration circuit 30. The energy storage switch circuit 120 converts the input power supply voltage into a positive voltage Vpre_p and a negative voltage Vpre_n. The voltage regulator circuit 20 is connected to the energy storage switch circuit 120 and is used to regulate the positive voltage Vpre_p and the negative voltage Vpre_n respectively to obtain a positive power supply voltage ELVDD and a negative power supply voltage ELVSS.

[0025] The detection arbitration circuit 30 is connected to the voltage regulator circuit 20. It detects the positive power supply voltage difference ΔVp between the preceding positive voltage Vpre_p and the positive power supply voltage ELVDD, and the negative power supply voltage difference ΔVn between the preceding negative voltage Vpre_n and the negative power supply voltage ELVSS. Based on these differences, it outputs a time-sharing control signal to the control module 110. The control module 110 is connected to the detection arbitration circuit 30 and determines the switching signal based on the time-sharing control signal. The energy storage switch circuit 120 is connected to the control module 110 and is also used to dynamically adjust the time-sharing adjustment ratio of the preceding positive voltage Vpre_p and the preceding negative voltage Vpre_n based on the switching signal, thereby regulating the positive power supply voltage ELVDD and the negative power supply voltage ELVSS.

[0026] In this embodiment, the energy storage switch circuit 120 can convert one power supply voltage into two voltages: a front-end positive voltage and a front-end negative voltage. The voltage regulator circuit 20 can regulate both the front-end positive and negative voltages separately. The voltage regulator circuit 20 regulates the front-end positive voltage to obtain a positive power supply voltage ELVDD. Both the positive power supply voltage ELVDD and the negative power supply voltage ELVSS are connected to the downstream load. The positive power supply voltage ELVDD provides a positive power supply voltage to the OLED pixel driving circuit. The voltage regulator circuit 20 regulates the front-end negative voltage to obtain a negative power supply voltage ELVSS. The negative power supply voltage ELVSS provides the OLED pixel cathode reference potential.

[0027] During dynamic screen switching, the displayed content changes dynamically, causing variations in the loads connected to the positive power supply voltage ELVDD and the negative power supply voltage ELVSS, resulting in an asymmetrical load and a voltage drop. This causes changes in the positive power supply voltage difference ΔVp and the negative power supply voltage difference ΔVn. By detecting these differences through the arbitration circuit 30, the input and output voltages of the voltage regulator circuit 20 can be simultaneously fed back, providing real-time feedback on its operating status and overcoming the limitations of traditional technologies that rely solely on output voltage feedback. The positive power supply voltage difference ΔVp reflects the voltage difference status of the positive power supply channel and the changes in the load connected to the positive power supply voltage ELVDD. Similarly, the negative power supply voltage difference ΔVn reflects the voltage difference status of the negative power supply channel and the changes in the load connected to the negative power supply voltage ELVSS. Based on these differences, the arbitration circuit 30 can determine the voltage difference status of the two power supply channels and thus the changes in the load.

[0028] The detection arbitration circuit 30 determines the time-sharing control signal based on the positive power supply voltage difference ΔVp and the negative power supply voltage difference ΔVn, and can redistribute the original time-sharing adjustment ratio to cope with changes in the voltage difference state of the two power supply channels. Therefore, after receiving the time-sharing control signal sent by the detection arbitration circuit 30, the control module 110 determines the switching signal based on the time-sharing control signal, so that the energy storage switch circuit 120 can adjust the time-sharing adjustment ratio of the front-stage positive voltage and the front-stage negative voltage according to the switching signal, thus redistributing the front-stage positive voltage and the front-stage negative voltage to cope with changes in the voltage difference state of the two power supply channels. Therefore, after receiving the switching signal sent by the control module 110, the energy storage switch circuit 120 dynamically adjusts the time-sharing adjustment ratio of the front-stage positive voltage Vpre_p and the front-stage negative voltage Vpre_n according to the switching signal, which can realize the dynamic adjustment of the subsequent positive power supply voltage ELVDD and negative power supply voltage ELVSS, ensuring the stability of the positive power supply voltage ELVDD and the negative power supply voltage ELVSS to cope with dynamic load changes. Therefore, the adaptive power management circuit 100 provided in this application can achieve efficient dynamic energy scheduling, ensure that the positive power supply voltage ELVDD and negative power supply voltage ELVSS of each channel output remain stable, avoid entering a voltage drop state when the screen is dynamically switched, and ensure the normal display of the AMOLED display panel.

[0029] In some embodiments, the output voltage range of the positive supply voltage ELVDD is 5V to 7V. The output voltage range of the negative supply voltage ELVSS is -2V to -4V.

[0030] Please see Figure 2 In some embodiments, the adaptive power management circuit 100 further includes a power input circuit 40. The power input circuit 40 is connected to the energy storage switch circuit 120 and is used to provide a power supply voltage to the energy storage switch circuit 120.

[0031] In this embodiment, the power input circuit 40 can be a battery or an external DC power source, providing the required power voltage to the energy storage switch circuit 120. The voltage range of the power input circuit 40 is 3.0V to 4.5V. Through the energy storage switch circuit 120 and the voltage regulator circuit 20, the power voltage can be converted into two power supplies required for display driving, namely the positive power supply voltage ELVDD and the negative power supply voltage ELVSS.

[0032] Please see Figure 3 In some embodiments, the detection arbitration circuit 30 includes a negative terminal differential voltage detection module 310, a positive terminal differential voltage detection module 320, and a differential voltage arbitration module 330. The negative terminal differential voltage detection module 310 is connected to the voltage regulator circuit 20 and is used to detect the negative power supply voltage difference ΔVn. The positive terminal differential voltage detection module 320 is connected to the voltage regulator circuit 20 and is used to detect the positive power supply voltage difference ΔVp.

[0033] The differential pressure arbitration module 330 is connected to the negative terminal differential pressure detection module 310 and the positive terminal differential pressure detection module 320, and is used to determine the time-sharing control signal based on the positive power supply voltage difference ΔVp and the negative power supply voltage difference ΔVn. The differential pressure arbitration module 330 is also connected to the control module 110, and is used to output the time-sharing control signal to the control module 110.

[0034] In this embodiment, the increased load leads to a larger load current, which in turn gradually pulls down the input and output voltages of the voltage regulator circuit 20, causing the voltage difference to decrease and entering a voltage drop state. The negative terminal voltage difference detection module 310 can detect the negative power supply voltage difference ΔVn. The positive terminal voltage difference detection module 320 can detect the positive power supply voltage difference ΔVp. The positive power supply voltage difference ΔVp and the negative power supply voltage difference ΔVn reflect the operating state of the subsequent voltage regulator circuit 20.

[0035] Furthermore, the differential voltage arbitration module 330 can determine the load status of the two power supplies, positive power supply voltage ELVDD and negative power supply voltage ELVSS, based on the positive power supply voltage difference ΔVp and negative power supply voltage difference ΔVn, and take timely countermeasures. It generates a time-sharing control signal and sends it to the control module 110, enabling the control module 110 to control the energy storage switch circuit 120 to dynamically adjust the time-sharing adjustment ratio of the front-end positive voltage Vpre_p and the front-end negative voltage Vpre_n to stabilize the positive power supply voltage ELVDD and the negative power supply voltage ELVSS. Thus, through the negative terminal differential voltage detection module 310, the positive terminal differential voltage detection module 320, and the differential voltage arbitration module 330, the control module 110 and the energy storage switch circuit 120 can break the fixed polling ratio and redistribute the charging cycle to cope with changes in the downstream load, resolving the risk of voltage drop caused by asymmetrical load during dynamic switching of OLED screens.

[0036] Please see Figure 3 In some embodiments, the voltage regulator circuit 20 includes a negative-terminal voltage regulator module 210 and a positive-terminal voltage regulator module 220. The negative-terminal voltage regulator module 210 is connected to the energy storage switch circuit 120 and is used to regulate the preceding negative voltage Vpre_n to obtain the negative power supply voltage ELVSS. The negative-terminal voltage difference detection module 310 is connected to the input and output terminals of the negative-terminal voltage regulator module 210 and is used to acquire the preceding negative voltage and the negative power supply voltage, and determine the negative power supply voltage difference ΔVn based on the preceding negative voltage and the negative power supply voltage.

[0037] The positive terminal voltage regulator module 220 is connected to the energy storage switch circuit 120 and is used to regulate the preceding positive voltage Vpre_p to obtain the positive power supply voltage ELVDD. The positive terminal voltage difference detection module 320 is connected to the input and output terminals of the positive terminal voltage regulator module 220 and is used to obtain the preceding positive voltage and the positive power supply voltage, and determine the positive power supply voltage difference ΔVp based on the preceding positive voltage and the positive power supply voltage.

[0038] In this embodiment, the negative-terminal voltage regulator module 210 and the positive-terminal voltage regulator module 220 can be low-dropout linear regulators (LDOs). The energy storage switch circuit 120 can generate a bipolar negative voltage Vpre_n and a positive voltage Vpre_p. By regulating the negative voltage Vpre_n and the positive voltage Vpre_p of the front-end energy storage switch circuit 120 respectively, the switching ripple and high-frequency noise generated during the operation of the front-end energy storage switch circuit 120 can be suppressed, resulting in a more stable and reliable negative power supply voltage ELVSS and a positive power supply voltage ELVDD, providing a stable and reliable voltage to the load. Furthermore, the negative-terminal voltage regulator module 210 and the positive-terminal voltage regulator module 220 can provide a low-noise power supply to the OLED pixel driving circuit, avoiding brightness ripples or flickering during display.

[0039] Please see Figure 4 In some embodiments, the differential pressure arbitration module 330 includes a minimum value selection module 331, a duty cycle adjustment module 332, and a priority selection module 333. The minimum value selection module 331 is connected to the negative terminal differential pressure detection module 310 and the positive terminal differential pressure detection module 320, and is used to determine the minimum differential pressure between the negative power supply voltage difference ΔVn and the positive power supply voltage difference ΔVp.

[0040] The duty cycle adjustment module 332 is connected to the minimum value selection module 331 and is used to generate a square wave pulse signal based on the minimum voltage difference, reference voltage, and sawtooth wave signal, and send the square wave pulse signal to the control module 110. The reference voltage is determined based on the safety threshold of the voltage regulator circuit 20. The priority selection module 333 is connected to the negative terminal voltage difference detection module 310 and the positive terminal voltage difference detection module 320 and is used to send a priority signal to the control module 110 based on the negative power supply voltage difference ΔVn and the positive power supply voltage difference ΔVp. The time-sharing control signal includes a square wave pulse signal and a priority signal. The control module 110 is connected to the duty cycle adjustment module 332 and the priority selection module 333 and is used to determine the switching signal based on the square wave pulse signal and the priority signal. The time-sharing control signal includes a square wave pulse signal and a priority signal.

[0041] In this embodiment, by comparing the negative power supply voltage difference ΔVn and the positive power supply voltage difference ΔVp in real time using the minimum value selection module 331, the voltage difference status between the negative terminal voltage regulator module 210 and the positive terminal voltage regulator module 220 can be determined, accurately identifying the worst-performing channel closest to the voltage drop limit. The minimum voltage difference reflects an increase in the load and current of the corresponding power supply channel, resulting in a voltage drop, corresponding to the power supply channel closest to the voltage drop limit. Furthermore, the minimum value selection module 331 can obtain information about the changes in the two power supplies to generate a time-division control signal, enabling the control module 110 to make timely adjustments and prioritize allocating inductor energy storage cycles to that channel.

[0042] The duty cycle adjustment module 332, based on the minimum voltage difference and reference voltage, can cut the sawtooth wave signal and adjust the duty cycle to obtain a square wave pulse signal with the same frequency as the sawtooth wave. The reference voltage is determined according to the safety threshold of the voltage regulator circuit 20, which can also be understood as being determined according to the safety threshold of the negative-terminal voltage regulator module 210 or the positive-terminal voltage regulator module 220. In one embodiment, the safety threshold ranges from 300mV to 400mV. By introducing the reference voltage into the duty cycle adjustment module 332, and thus incorporating the safety threshold into the duty cycle adjustment module 332, the negative power supply voltage difference ΔVn is compared with the positive power supply voltage difference ΔVp and the safety threshold. This ensures that the negative-terminal voltage regulator module 210 and the positive-terminal voltage regulator module 220 operate within their optimal linear adjustment range, significantly reducing the power loss of the negative-terminal voltage regulator module 210 and the positive-terminal voltage regulator module 220.

[0043] The duty cycle adjustment module 332 compares the minimum voltage difference between the negative power supply voltage difference ΔVn and the positive power supply voltage difference ΔVp with a reference voltage, thereby comparing the minimum voltage difference between these two voltages with a safety threshold. Therefore, when the minimum voltage difference is greater than the reference voltage, it indicates that both the negative power supply voltage difference ΔVn and the positive power supply voltage difference ΔVp are above the safety threshold. By using the minimum voltage difference and the reference voltage, the duty cycle adjustment module 332 segments the sawtooth wave signal and adjusts the duty cycle, narrowing the duty cycle of the square wave pulse signal to reduce power consumption. Meanwhile, the time-division multiplexing distributor in the control module 110 maintains a fixed time-division adjustment ratio of 50%:50% alternating polling.

[0044] When the minimum voltage difference is less than the reference voltage, it indicates that the voltage difference between the negative power supply voltage difference ΔVn and the positive power supply voltage difference ΔVp is below the safety threshold. The duty cycle adjustment module 332, by using the minimum voltage difference and the reference voltage to cut the sawtooth wave signal and adjust the duty cycle, can widen the duty cycle of the square wave pulse signal, concentrating power supply energy to the worst-performing channel and activating asymmetric priority routing. At this time, the time-division multiplexing distributor in the control module 110 adjusts at a time-division ratio of 70%:30%.

[0045] The priority selection module 333 determines which power supply voltage, ELVSS or ELVDD, needs more timely adjustment based on the magnitude of the negative power supply voltage difference ΔVn and the positive power supply voltage difference ΔVp, thus prioritizing the allocation of inductor energy storage cycles to that channel. The time-sharing control signal includes a square wave pulse signal and a priority signal. Therefore, the control module 110 simultaneously receives both the square wave pulse signal and the priority signal, allowing it to prioritize allocating more power supply energy to the power supply channel requiring adjustment for timely adjustment. This addresses the continuous changes in the load connected to the downstream circuitry, preventing the negative terminal voltage regulator module 210 and the positive terminal voltage regulator module 220 from entering a voltage drop failure state, and resolving the risk of voltage drop caused by asymmetrical loads during dynamic switching of OLED screens.

[0046] Therefore, by using the minimum value selection module 331, duty cycle adjustment module 332, and priority selection module 333 provided in this application, differential pressure adaptive tracking control can be achieved, ensuring that the negative-end voltage regulator module 210 and the positive-end voltage regulator module 220 are always within the optimal linear adjustment range, thus reducing power consumption. Simultaneously, by using the minimum value selection module 331, duty cycle adjustment module 332, and priority selection module 333 provided in this application, even when there is significant asymmetry in the OLED display load, the output power supplies can still remain stable, achieving high-efficiency and low-ripple dynamic energy scheduling.

[0047] In some embodiments, the time-division control signals sent by the minimum value selection module 331, the duty cycle adjustment module 332, and the priority selection module 333 enable the control module 110 and the energy storage switch circuit 120 to dynamically adjust the time-division adjustment ratio of the front-stage positive voltage Vpre_p and the front-stage negative voltage Vpre_n from the original 50%:50% to 70%:30%, so that the time-division adjustment ratio of the positive power supply voltage ELVDD and the negative power supply voltage ELVSS is adjusted to 70%:30%, prioritizing energy allocation to the positive power supply output channel. Therefore, through the differential voltage arbitration control mechanism provided in this application, even when there is significant asymmetry in the OLED display load, the stability of each output power supply can be ensured, avoiding voltage drop.

[0048] Please see Figure 5 In some embodiments, the control module 110 is connected to the duty cycle adjustment module 332 and the priority selection module 333, and is used to determine the switching signal based on the square wave pulse signal and the priority signal.

[0049] The energy storage switch circuit 120 is connected to the control module 110 and is used to dynamically adjust the time-sharing adjustment ratio of the front-stage positive voltage Vpre_p and the front-stage negative voltage Vpre_n according to the switch signal, so as to regulate the positive power supply voltage ELVDD and the negative power supply voltage ELVSS.

[0050] In this embodiment, based on the negative terminal differential pressure detection module 310 and the positive terminal differential pressure detection module 320, differential pressure tracking can be achieved, constructing an analog closed-loop servo structure centered on maintaining a safety threshold (e.g., 300mV to 400mV). The minimum value selection module 331 can select the duty cycle of the global square wave pulse signal to dynamically adjust the minimum differential pressure, allowing the control module 110 to charge or put the positive power supply voltage ELVDD and the negative power supply voltage ELVSS into sleep mode. Furthermore, through the adaptive power management circuit 100 provided in this application, not only can the stability of each output power supply be ensured to avoid voltage drop, but also excess front-end voltage can be naturally consumed by the load to the safety threshold, achieving dynamic optimization across the entire load range and squeezing the heat dissipation of the negative terminal voltage regulator module 210 and the positive terminal voltage regulator module 220 to their physical limits.

[0051] In one embodiment, the control module 110 may include a time-division multiplexing distributor that can send a switching signal based on a square wave pulse signal and a priority signal to dynamically adjust the time-division adjustment ratio of the preceding positive voltage Vpre_p and the preceding negative voltage Vpre_n, so as to realize the dynamic adjustment of the positive power supply voltage ELVDD and the negative power supply voltage ELVSS.

[0052] Please see Figure 5 In some embodiments, the energy storage switching circuit 120 includes a first switching transistor 121, a second switching transistor 122, an inductor 123, a third switching transistor 124, a fourth switching transistor 125, a second capacitor 126, and a third capacitor 127. The first terminal of the first switching transistor 121 is connected to the control module 110, the second terminal of the first switching transistor 121 is connected to the power input circuit 40, and the third terminal of the first switching transistor 121 is connected to the first terminal of the inductor 123. The first terminal of the third switching transistor 124 is connected to the control module 110, the second terminal of the third switching transistor 124 is connected to the power input circuit 40, and the third terminal of the third switching transistor 124 is connected to the second terminal of the inductor 123. The first terminal of the second switching transistor 122 is connected to the control module 110, and the second terminal of the second switching transistor 122 is connected to the first terminal of the inductor 123. The third terminal of the second switching transistor 122 is connected to the first terminal of the second capacitor 126, and the second terminal of the second capacitor 126 is grounded. The first terminal of the second capacitor 126 is connected to the input terminal of the negative-terminal voltage regulator module 210. The voltage at the first terminal of the second capacitor 126 is the negative voltage Vpre_n of the preceding stage.

[0053] The first terminal of the fourth switch 125 is connected to the control module 110, and the second terminal of the fourth switch 125 is connected to the second terminal of the inductor 123. The third terminal of the fourth switch 125 is connected to the first terminal of the third capacitor 127. The second segment of the third capacitor 127 is grounded. The first terminal of the third capacitor 127 is connected to the positive voltage regulator module 220. The voltage at the first terminal of the third capacitor 127 is the positive voltage Vpre_p of the preceding stage.

[0054] When the time-sharing regulation ratio of the front-stage positive voltage Vpre_p and the front-stage negative voltage Vpre_n is dynamically adjusted to 70%:30%, the time-sharing regulation ratio of the positive power supply voltage ELVDD and the negative power supply voltage ELVSS can also be achieved to 70%:30%. During the first phase φ1, the control module 110 drives the first switch 121 to conduct and the second switch 122 to turn off, causing the inductor 123 to enter boost mode, thereby charging the positive power supply output node and generating the front-stage voltage ELVDD, i.e., the front-stage positive voltage Vpre_p. The front-stage positive voltage Vpre_p passes through the positive terminal voltage regulator module 220 to generate the positive power supply voltage ELVDD.

[0055] During the second phase φ2, control module 110 drives the third switch 124 to conduct and the fourth switch 125 to turn off, causing the current in inductor 123 to be redirected. This generates a negative voltage through the reverse conversion structure, thereby charging the negative power supply output node and generating the ELVSS pre-stage voltage, i.e., the pre-stage negative voltage Vpre_n. The pre-stage negative voltage Vpre_n passes through the negative terminal voltage regulator module 210 to generate the negative power supply voltage ELVSS.

[0056] The energy storage switching circuit 120 allows the two output voltages to be multiplexed in the time dimension. Furthermore, a single inductor can generate both positive and negative power supplies, reducing the number of external inductors, increasing the integration of the adaptive power management circuit 100, and lowering circuit costs. Thus, by generating a bipolar pre-regulated voltage using a single energy storage inductor, and cascading the negative-side voltage regulator module 210 and the positive-side voltage regulator module 220 for secondary regulation, the number of external inductors is significantly reduced, and the circuit board area is minimized. Simultaneously, it effectively isolates front-end switching noise, providing an absolutely clean bias power supply for the AMOLED pixel circuit, which is extremely sensitive to ripple.

[0057] The types of the first switch 121, the second switch 122, the third switch 124, and the fourth switch 125 can be set according to the actual application scenario, and this application does not impose any restrictions. In some embodiments, the first switch 121, the second switch 122, the third switch 124, and the fourth switch 125 can be NMOS.

[0058] Please see Figure 6In some embodiments, the negative terminal differential pressure detection module 310 includes a first resistor 311, a first operational amplifier 312, a second resistor 313, a third resistor 314, and a fourth resistor 315. The first terminal of the first resistor 311 is connected to the input terminal of the negative terminal voltage regulator module 210.

[0059] The inverting input terminal of the first operational amplifier 312 is connected to the second terminal of the first resistor 311. The first terminal of the second resistor 313 is connected to the first terminal of the first resistor 311. The second terminal of the second resistor 313 is connected to the output terminal of the first operational amplifier 312. The output terminal of the first operational amplifier 312 outputs a negative power supply voltage difference ΔVn.

[0060] The first terminal of the third resistor 314 is connected to the output terminal of the negative voltage regulator module 210. The second terminal of the third resistor 314 is grounded. The first terminal of the fourth resistor 315 is connected to the first terminal of the third resistor 314. The second terminal of the fourth resistor 315 is connected to the non-inverting input terminal of the first operational amplifier 312.

[0061] In this embodiment, Figure 6 In this diagram, V1 and V2 represent the input and output voltages of the negative voltage regulator module 210, respectively, i.e., the preceding negative voltage Vpre_n and the negative power supply voltage ELVSS. The negative power supply voltage difference ΔVn is input to the differential voltage arbitration module 330.

[0062] In one embodiment, the resistance ratio of the second resistor 313 to the first resistor 311 is 5. The resistance ratio of the third resistor 314 to the fourth resistor 315 is 5. The second resistor 313 and the third resistor 314 have the same resistance value. The first resistor 311 and the fourth resistor 315 have the same resistance value. When the voltage difference between the current stage negative voltage Vpre_n and the negative power supply voltage ELVSS is 300mV, the negative power supply voltage difference ΔVn = (V2 - V1) * R 313 / R 311 =1.5V, which is the optimal operating state for the negative terminal voltage regulator module 210.

[0063] In one embodiment, the reference voltage is determined based on the safety threshold of the negative terminal voltage regulator module 210, and can be set to 1.5V.

[0064] In some embodiments, the circuit structure of the positive terminal differential voltage detection module 320 is the same as that of the negative terminal differential voltage detection module 310. Similar to the previous embodiment, when V1 and V2 represent the input and output voltages of the positive terminal voltage regulator module 220, respectively (i.e., the preceding positive voltage Vpre_p and the positive power supply voltage ELVDD), the positive power supply voltage difference ΔVp = (V2 - V1) * R 313 / R 311 .

[0065] Please see Figure 7In some embodiments, the minimum value selection module 331 includes a second operational amplifier 3311, a first diode 3312, a fifth resistor 3313, a third operational amplifier 3314, and a second diode 3315. The non-inverting input of the second operational amplifier 3311 is connected to the output of the positive terminal voltage difference detection module 320 to obtain the positive power supply voltage difference ΔVp.

[0066] The cathode of the first diode 3312 is connected to the output of the second operational amplifier 3311. The first terminal of the fifth resistor 3313 is used to obtain the supply voltage VDD, and the second terminal of the fifth resistor 3313 is connected to the anode of the first diode 3312 and the inverting input of the second operational amplifier 3311.

[0067] The inverting input of the third operational amplifier 3314 is connected to the second terminal of the fifth resistor 3313, and the non-inverting input of the third operational amplifier 3314 is connected to the output of the negative terminal voltage difference detection module 310, for obtaining the negative power supply voltage difference ΔVn. The cathode of the second diode 3315 is connected to the output of the third operational amplifier 3314, and the anode of the second diode 3315 is connected to the second terminal of the fifth resistor 3313.

[0068] In this embodiment, as Figure 7 The voltage at point C shown is pulled up by the fifth resistor 3313, so it can be considered as VDD. The voltage at point C is connected back to the inverting inputs of the second operational amplifier 3311 and the third operational amplifier 3314. When the positive power supply voltage difference ΔVp is less than the voltage at point C, the output of the second operational amplifier 3311 outputs a negative voltage, and the first diode 3312 conducts, pulling down the voltage at point C. Similarly, when the negative power supply voltage difference ΔVn is less than the voltage at point C, the output of the third operational amplifier 3314 outputs a negative voltage, and the second diode 3315 conducts, accelerating the decrease in the voltage at point C.

[0069] When the positive power supply voltage difference ΔVp is less than the negative power supply voltage difference ΔVn, the voltage at point C drops below the negative power supply voltage difference ΔVn. At this point, the output of the third operational amplifier 3314 outputs a positive voltage, the second diode 3315 is cut off, and the first diode 3312 remains conducting. The voltage at point C continues to decrease until it equals the positive power supply voltage difference ΔVp. Therefore, the minimum voltage difference can be selected from the positive power supply voltage difference ΔVp and the negative power supply voltage difference ΔVn using the minimum value selection module 331.

[0070] In some embodiments, if the voltage difference between the input and output terminals of the positive-terminal voltage regulator module 220 corresponding to the positive power supply voltage ELVDD is 200mV, the positive power supply voltage difference ΔVp = 1V is obtained after detection by the positive terminal voltage difference detection module 320. Similarly, if the voltage difference between the input and output terminals of the negative-terminal voltage regulator module 210 corresponding to the negative power supply voltage ELVSS is 400mV, the negative power supply voltage difference ΔVn = 2V is obtained after detection by the negative terminal voltage difference detection module 310. If VDD = 3.3V, the voltage at point C can be considered to be 3.3V due to the pull-up of the fifth resistor 3313. The voltage at point C is connected back to the inverting input terminals of the second operational amplifier 3311 and the third operational amplifier 3314. Since the positive power supply voltage difference ΔVp < 3.3V, the output terminal of the second operational amplifier 3311 outputs a negative voltage, and the first diode 3312 conducts, pulling down the voltage at point C. Similarly, when the negative power supply voltage difference ΔVn is less than 3.3V, the output terminal of the third operational amplifier 3314 outputs a negative voltage, the second diode 3315 conducts, and the voltage drop at point C is accelerated.

[0071] When the positive power supply voltage difference ΔVp is less than the negative power supply voltage difference ΔVn, the voltage at point C drops below the negative power supply voltage difference ΔVn. At this time, the output of the third operational amplifier 3314 outputs a positive voltage, the second diode 3315 is cut off, and the first diode 3312 is still conducting. The voltage at point C continues to drop until the voltage at point C is equal to the positive power supply voltage difference ΔVp.

[0072] Please see Figure 8 In some embodiments, the duty cycle adjustment module 332 includes a fourth operational amplifier 3321, a sixth resistor 3322, a first capacitor 3323, and a fifth operational amplifier 3324. The non-inverting input of the fourth operational amplifier 3321 is used to obtain a reference voltage Vref. The inverting input of the fourth operational amplifier 3321 is connected to the second terminal of the fifth resistor 3313 to obtain the minimum voltage difference.

[0073] The first terminal of the sixth resistor 3322 is connected to the inverting input terminal of the fourth operational amplifier 3321. The first terminal of the first capacitor 3323 is connected to the second terminal of the sixth resistor 3322. The second terminal of the first capacitor 3323 is connected to the output terminal of the fourth operational amplifier 3321.

[0074] The non-inverting input of the fifth operational amplifier 3324 is connected to the output of the fourth operational amplifier 3321. The inverting input of the fifth operational amplifier 3324 is used to obtain a sawtooth wave. The output of the fifth operational amplifier 3324 is used to output a square wave pulse signal.

[0075] In this embodiment, the reference voltage Vref can be determined based on the safety threshold of the negative terminal voltage regulator module 210, and can be set to 1.5V. The inverting input terminal of the fourth operational amplifier 3321 is the voltage at point C, through... Figure 7 The minimum voltage difference is obtained after filtering by the minimum value selection module 331. The minimum voltage difference can be either the positive power supply voltage difference ΔVp or the negative power supply voltage difference ΔVn. The smaller the minimum voltage difference, the larger the output voltage of the fourth operational amplifier 3321. The sawtooth wave input to the inverting input of the fifth operational amplifier 3324 is cut by the output voltage of the fourth operational amplifier 3321. The high level of the square wave pulse signal output by the fifth operational amplifier 3324 becomes wider and the duty cycle becomes larger, thereby realizing the dynamic adjustment of the square wave pulse signal and sending it to the control module 110.

[0076] Please see Figure 9 In some embodiments, the priority selection module 333 includes a sixth operational amplifier 3331. The non-inverting input of the sixth operational amplifier 3331 is connected to the output of the positive terminal voltage difference detection module 320 to acquire the positive power supply voltage difference ΔVp. The inverting input of the sixth operational amplifier 3331 is connected to the output of the negative terminal voltage difference detection module 310 to acquire the negative power supply voltage difference ΔVn. The output of the sixth operational amplifier 3331 is used to output a priority signal.

[0077] In this embodiment, the non-inverting input of the sixth operational amplifier 3331 is connected to the positive power supply voltage difference ΔVp. The inverting input of the sixth operational amplifier 3331 is connected to the negative power supply voltage difference ΔVn. When the positive power supply voltage difference ΔVp is less than the negative power supply voltage difference ΔVn, the sixth operational amplifier 3331 outputs a clear digital level, such as Logic 0, as a Flag bit, and uses this as a priority signal. Conversely, when the negative power supply voltage difference ΔVn is less than the positive power supply voltage difference ΔVp, the sixth operational amplifier 3331 outputs Logic 1 as a Flag bit, and uses this as a priority signal.

[0078] Furthermore, the time-division multiplexing distributor in control module 110 simultaneously receives square wave pulse signals and priority signals. In Logic 0, the positive power supply voltage ELVDD is in its worst-case scenario, at which point the input-output voltage difference of the positive terminal voltage regulator module 220 will be less than the safety threshold. The time-division multiplexing distributor will continuously allocate 2 or 3 φ1 cycles (which can also be understood as positive voltage charging cycles) to charge the positive power supply voltage ELVDD. Based on the square wave pulse signal, the time-division multiplexing distributor drives the first terminals (i.e., gate terminals) of the third switch 124 and the fourth switch 125. The channel containing the negative power supply voltage ELVSS is in sleep or micro-charging mode, maintaining the negative power supply voltage ELVSS from power loss.

[0079] Conversely, when the input-output voltage difference of the positive terminal voltage regulator module 220 (or the input-output voltage difference of the negative terminal voltage regulator module 210) is detected to be greater than the safety threshold, the fourth operational amplifier 3321 reduces the output voltage, and the fifth operational amplifier 3324 then outputs a square wave pulse signal with a smaller duty cycle to reduce the energy injection of the previous stage, so that the input-output voltage difference of the positive terminal voltage regulator module 220 (or the negative terminal voltage regulator module 210) naturally falls back, thereby achieving the full load range.

[0080] Please see Figure 10 In some embodiments, the detection arbitration circuit 30 includes an analog-to-digital converter (ADC) module 340 and a digital logic module 350. The ADC module 340 is connected to the voltage regulator circuit 20 and is used to acquire the preceding positive voltage, the positive power supply voltage, the preceding negative voltage, and the negative power supply voltage. The digital logic module 350 is connected to the ADC module 340 and is used to determine the positive power supply voltage difference based on the preceding positive voltage and the positive power supply voltage, and to determine the negative power supply voltage difference based on the preceding negative voltage and the negative power supply voltage.

[0081] The digital logic module 350 is also used to determine the minimum voltage difference between the negative and positive power supply voltage differences. Connected to the control module 110, the digital logic module 350 generates a square wave pulse signal based on the minimum voltage difference, the reference voltage, and the sawtooth wave signal, and sends the square wave pulse signal to the control module 110. The digital logic module 350 also determines a priority signal based on the negative and positive power supply voltage differences and sends the priority signal to the control module 110. Connected to the digital logic module 350, the control module 110 determines a switching signal based on the square wave pulse signal and the priority signal, so that the energy storage switching circuit 120 dynamically adjusts the time-sharing regulation ratio of the preceding positive and negative voltages according to the switching signal, thereby regulating the positive and negative power supply voltages.

[0082] In this embodiment, the detection arbitration circuit 30 may further include an analog-to-digital conversion module 340 and a digital logic module 350, using digital control to implement its functions. In some embodiments, the analog-to-digital conversion module 340 may be an analog-to-digital converter. In some embodiments, the digital logic module 350 may be a field-programmable gate array or a microcontroller, using firmware algorithms to implement minimum value selection, duty cycle adjustment, and priority selection functions, generating a digital square wave pulse signal to the control module 110. Furthermore, by modifying the safety threshold in the register of the digital logic module 350, different target values ​​can be set for different types of OLED panels.

[0083] Please see Figure 11 and Figure 12 In some embodiments, the digital logic module 350 is also used to acquire the frame synchronization signal and determine the load change time based on the frame synchronization signal. The digital logic module 350 is also used to generate square wave pulse signals and priority signals before the load change occurs.

[0084] In this embodiment, the timing controller 200 or the display driver integrated circuit 300 sends a frame synchronization signal VSYNC to the digital logic module 350. Based on the frame synchronization signal, the digital logic module 350 can detect the moment of load change. For example, when the screen switches from completely black to completely white, the load will change dramatically, the load current will surge, and voltage drop may easily occur. Therefore, before the moment of load change, the digital logic module 350 can increase the duty cycle of the square wave pulse signal and lock the priority of the positive power supply voltage ELVDD without waiting to detect the minimum voltage difference, prioritizing power supply to the positive power supply voltage ELVDD to achieve a zero-delay transient response.

[0085] In some embodiments, the digital logic module 350 is further configured to acquire a brightness change signal and determine the time of load change based on the brightness change signal; The digital logic module 350 is also used to generate square wave pulse signals and priority signals before the load change occurs.

[0086] In this embodiment, the timing controller 200 or the display driver integrated circuit 300 sends a brightness change signal (which can also be understood as a DBV adjustment command) to the digital logic module 350. Based on the brightness change signal, the digital logic module 350 can detect the moment of load change. For example, when the screen switches from completely black to completely white, the load will change dramatically, the load current will surge, and voltage drop may easily occur. Therefore, before the moment of load change, the digital logic module 350 can increase the duty cycle of the square wave pulse signal and lock the priority of the positive power supply voltage ELVDD without waiting to detect the minimum voltage difference, thus prioritizing power supply to the positive power supply voltage ELVDD and achieving a zero-delay transient response.

[0087] Thus, through the interaction between the timing controller 200 or the display driver integrated circuit 300 and the adaptive power management circuit 100, the real-time transmission of display load information and the dynamic coordination of power supply strategies are realized, thereby improving the voltage drop problem of positive power supply voltage ELVDD and negative power supply voltage ELVSS under asymmetrical load.

[0088] Please see Figure 13In some embodiments, the positive terminal regulator module 220 includes a fourth capacitor 221, a control transistor 222, a seventh operational amplifier 223, a seventh resistor 224, an eighth resistor 225, and a fifth capacitor 226. The first terminal of the fourth capacitor 221 is connected to the third terminal of the fourth switching transistor 125, and the second terminal of the fourth capacitor 221 is grounded. The first terminal of the control transistor 222 is connected to the output terminal of the seventh operational amplifier 223. The second terminal of the control transistor 222 is connected to the first terminal of the fourth capacitor 221. The third terminal of the control transistor 222 is connected to the first terminal of the seventh resistor 224. The second terminal of the seventh resistor 224 is connected to the inverting input terminal of the seventh operational amplifier 223. The non-inverting input terminal of the seventh operational amplifier 223 is used to obtain the reference voltage Ref. The first terminal of the eighth resistor 225 is connected to the second terminal of the seventh resistor 224. The second terminal of the eighth resistor 225 is grounded. The first terminal of the fifth capacitor 226 is connected to the first terminal of the seventh resistor 224 and outputs a positive power supply voltage ELVDD.

[0089] In this embodiment, when the load increases, the positive power supply voltage ELVDD drops, and the voltage division value of the seventh resistor 224 and the eighth resistor 225 decreases. When the voltage division value of the seventh resistor 224 and the eighth resistor 225 is less than the reference voltage Ref, the output terminal of the seventh operational amplifier 223 outputs a positive voltage V+, causing the control transistor 222 to output a larger current, and the positive power supply voltage ELVDD returns to the preset value, thereby achieving the voltage regulation function.

[0090] In some embodiments, the circuit structure of the negative terminal voltage regulator module 210 is the same as that of the positive terminal voltage regulator module 220. Similarly, the input terminal of the negative terminal voltage regulator module 210 is Vpre_n, and the output terminal is the negative power supply voltage ELVSS.

[0091] In some embodiments, the number and performance parameters of resistors, capacitors, operational amplifiers, diodes, and switching transistors in the adaptive power management circuit 100 provided in this application can be adjusted according to the actual application scenario, as long as the functions of each module in this application can be realized.

[0092] Please see Figure 14 This application provides an adaptive power management method, comprising: Step S10: The input power supply voltage is converted into a positive voltage and a negative voltage of the preceding stage through the energy storage switch circuit 120. Step S20: The voltage regulator circuit 20 regulates the positive voltage and negative voltage of the preceding stage respectively to obtain the positive power supply voltage and the negative power supply voltage. Step S30: The detection arbitration circuit 30 detects the positive power supply voltage difference between the positive voltage of the preceding stage and the positive power supply voltage, as well as the negative power supply voltage difference between the negative voltage of the preceding stage and the negative power supply voltage, and determines the time-sharing control signal based on the positive power supply voltage difference and the negative power supply voltage difference. Step S40: Obtain the time-sharing control signal through the control module 110, and determine the switching signal based on the time-sharing control signal; In step S50, a switching signal is obtained through the energy storage switch circuit 120, and the time-sharing adjustment ratio of the positive voltage and the negative voltage of the preceding stage is dynamically adjusted according to the switching signal to regulate the positive power supply voltage and the negative power supply voltage.

[0093] In this embodiment, the description of step S10 can be found in the descriptions of the above embodiments. The description of step S20 can be found in the descriptions of the above embodiments. The description of step S30 can be found in the descriptions of the above embodiments. The description of step S40 can be found in the descriptions of the above embodiments. The description of step S50 can be found in the descriptions of the above embodiments.

[0094] This application provides a display device including an adaptive power management circuit 100 according to any of the above embodiments.

[0095] In this embodiment, the display device can be an electronic paper device, a liquid crystal panel, an OLED panel, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or other devices with display functions.

[0096] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0097] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0098] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0099] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0100] In the embodiments provided in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0101] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0102] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0103] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0104] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An adaptive power management circuit, characterized in that, include: The energy storage switch circuit (120) is used to convert the input power supply voltage into the positive voltage and negative voltage of the preceding stage; A voltage regulator circuit (20) is connected to the energy storage switch circuit (120) and is used to regulate the positive voltage and the negative voltage of the preceding stage respectively to obtain a positive power supply voltage and a negative power supply voltage. The detection arbitration circuit (30) is connected to the voltage regulator circuit (20) and is used to detect the positive power supply voltage difference between the positive voltage of the front stage and the positive power supply voltage, and to detect the negative power supply voltage difference between the negative voltage of the front stage and the negative power supply voltage, and to determine the time-division control signal based on the positive power supply voltage difference and the negative power supply voltage difference; The control module (110), connected to the detection arbitration circuit (30), is used to determine the switching signal according to the time-sharing control signal; The energy storage switch circuit (120) is connected to the control module (110) and is also used to adjust the time-division adjustment ratio of the positive voltage and the negative voltage of the preceding stage according to the switch signal, so as to adjust the positive power supply voltage and the negative power supply voltage.

2. The adaptive power management circuit as described in claim 1, characterized in that, The detection arbitration circuit (30) includes: The negative terminal voltage difference detection module (310) is connected to the voltage regulator circuit (20) and is used to detect the negative power supply voltage difference; A positive terminal voltage difference detection module (320) is connected to the voltage regulator circuit (20) and is used to detect the positive power supply voltage difference; The differential pressure arbitration module (330) is connected to the negative terminal differential pressure detection module (310) and the positive terminal differential pressure detection module (320) and is used to determine the time-sharing control signal based on the positive power supply voltage difference and the negative power supply voltage difference; The differential pressure arbitration module (330) is also connected to the control module (110) and is used to output the time-sharing control signal to the control module (110).

3. The adaptive power management circuit as described in claim 2, characterized in that, The voltage regulator circuit (20) includes: The negative terminal voltage regulator module (210) is connected to the energy storage switch circuit (120) and is used to regulate the negative voltage of the front stage to obtain a negative power supply voltage. The negative terminal voltage difference detection module (310) is connected to the input and output terminals of the negative terminal voltage regulator module (210) to obtain the negative voltage of the preceding stage and the negative power supply voltage, and to determine the negative power supply voltage difference based on the negative voltage of the preceding stage and the negative power supply voltage. A positive voltage regulator module (220) is connected to the energy storage switch circuit (120) and is used to regulate the positive voltage of the front stage to obtain a positive power supply voltage. The positive terminal voltage difference detection module (320) is connected to the input and output terminals of the positive terminal voltage regulator module (220) to obtain the positive voltage of the preceding stage and the positive power supply voltage, and to determine the positive power supply voltage difference based on the positive voltage of the preceding stage and the positive power supply voltage.

4. The adaptive power management circuit as described in claim 2, characterized in that, The differential pressure arbitration module (330) includes: The minimum value selection module (331) is connected to the negative terminal voltage difference detection module (310) and the positive terminal voltage difference detection module (320) and is used to determine the minimum voltage difference between the negative power supply voltage difference and the positive power supply voltage difference; The duty cycle adjustment module (332) is connected to the minimum value selection module (331) and is used to generate a square wave pulse signal based on the minimum voltage difference, the reference voltage and the sawtooth wave signal, and send the square wave pulse signal to the control module (110); wherein, the reference voltage is determined based on the safety threshold of the voltage regulator circuit (20); The priority selection module (333) is connected to the negative terminal differential pressure detection module (310) and the positive terminal differential pressure detection module (320) and is used to send a priority signal to the control module (110) according to the negative power supply voltage difference and the positive power supply voltage difference. The control module (110) is connected to the duty cycle adjustment module (332) and the priority selection module (333) and is used to determine the switching signal according to the square wave pulse signal and the priority signal; wherein, the time-division control signal includes the square wave pulse signal and the priority signal.

5. The adaptive power management circuit as described in claim 3, characterized in that, The negative end differential pressure detection module (310) includes: The first resistor (311) has its first end connected to the input terminal of the negative terminal voltage regulator module (210); The first operational amplifier (312) has its inverting input terminal connected to the second terminal of the first resistor (311); The second resistor (313) has its first end connected to the first end of the first resistor (311), and its second end connected to the output of the first operational amplifier (312). The output of the first operational amplifier (312) outputs the negative power supply voltage difference. The third resistor (314) has its first end connected to the output terminal of the negative terminal voltage regulator module (210), and its second end grounded. The fourth resistor (315) has its first end connected to the first end of the third resistor (314), and its second end connected to the non-inverting input of the first operational amplifier (312).

6. The adaptive power management circuit as described in claim 4, characterized in that, The minimum value selection module (331) includes: The second operational amplifier (3311) has its non-inverting input terminal connected to the output terminal of the positive terminal voltage difference detection module (320) to obtain the positive power supply voltage difference. The first diode (3312) has its cathode connected to the output terminal of the second operational amplifier (3311); The fifth resistor (3313) has a first end used to obtain the supply voltage, and the second end of the fifth resistor (3313) is connected to the anode of the first diode (3312) and the inverting input of the second operational amplifier (3311). The third operational amplifier (3314) has its inverting input terminal connected to the second terminal of the fifth resistor (3313), and its non-inverting input terminal connected to the output terminal of the negative terminal voltage difference detection module (310) to obtain the negative power supply voltage difference. The second diode (3315) has its cathode connected to the output terminal of the third operational amplifier (3314), and its anode connected to the second terminal of the fifth resistor (3313).

7. The adaptive power management circuit as described in claim 6, characterized in that, The duty cycle adjustment module (332) includes: The fourth operational amplifier (3321) has its non-inverting input terminal used to obtain the reference voltage, and its inverting input terminal connected to the second terminal of the fifth resistor (3313) to obtain the minimum voltage difference. The sixth resistor (3322) has its first end connected to the inverting input terminal of the fourth operational amplifier (3321); The first capacitor (3323) has its first end connected to the second end of the sixth resistor (3322), and its second end connected to the output terminal of the fourth operational amplifier (3321). The fifth operational amplifier (3324) has its non-inverting input connected to the output of the fourth operational amplifier (3321), its inverting input used to acquire a sawtooth wave, and its output used to output the square wave pulse signal.

8. The adaptive power management circuit as described in claim 4, characterized in that, The priority selection module (333) includes: The sixth operational amplifier (3331) has its non-inverting input connected to the output of the positive voltage difference detection module (320) to obtain the positive power supply voltage difference. The inverting input of the sixth operational amplifier (3331) is connected to the output of the negative voltage difference detection module (310) to obtain the negative power supply voltage difference. The output of the sixth operational amplifier (3331) is used to output the priority signal.

9. An adaptive power management method, characterized in that, include: The input power supply voltage is converted into a positive voltage and a negative voltage of the preceding stage through the energy storage switch circuit (120); The positive voltage and the negative voltage of the preceding stage are regulated by the voltage regulator circuit (20) to obtain the positive power supply voltage and the negative power supply voltage respectively. The arbitration circuit (30) detects the positive power supply voltage difference between the positive voltage of the preceding stage and the positive power supply voltage, and the negative power supply voltage difference between the negative voltage of the preceding stage and the negative power supply voltage, and determines the time-division control signal based on the positive power supply voltage difference and the negative power supply voltage difference. The time-sharing control signal is obtained through the control module (110), and the switching signal is determined based on the time-sharing control signal; The switching signal is obtained through the energy storage switch circuit (120), and the time-division adjustment ratio of the positive voltage and the negative voltage of the preceding stage is dynamically adjusted according to the switching signal, so as to regulate the positive power supply voltage and the negative power supply voltage.

10. A display device, characterized in that, Includes the adaptive power management circuit as described in any one of claims 1 to 8.

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