Voltage conversion circuit, driving method, device, and storage medium

Abstract

The embodiment of the application discloses a voltage conversion circuit, comprising: the first input end of a voltage feedback module is connected with a first reference voltage, and the second input end of the voltage feedback module is connected with a feedback voltage of a voltage holding module; the output end of the voltage feedback module is connected with the input end of the voltage adjustment module; the output end of the voltage adjustment module is connected with the first input end of the voltage holding module; the second input end of the voltage holding module is connected with a preset external voltage; the voltage feedback module is used for determining a target voltage based on the feedback voltage and the first reference voltage, and inputting the target voltage into the voltage adjustment module; the voltage adjustment module is used for adjusting the target voltage to obtain an adjusted target voltage, and inputting the adjusted target voltage into the voltage holding module; the voltage holding module is used for adjusting the output voltage of the voltage holding module based on the preset external voltage and the adjusted target voltage, so that the output voltage of the voltage holding module is kept in a stable state.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of display technology, and in particular to a voltage conversion circuit, driving method, device, and storage medium. Background Technology

[0002] As the specifications and functions of small display drivers become increasingly sophisticated and the operating frequency of panel drivers increases, the efficiency of the power (DC-CDC converter) of the panel driver voltage becomes crucial. However, in related technologies, the voltage output by the DC-CDC converter experiences a certain voltage drop during the operation of the display panel, preventing the display panel from stably displaying images. Summary of the Invention

[0003] In view of this, embodiments of this application provide at least one voltage conversion circuit, driving method, device, and storage medium.

[0004] The technical solution of this application embodiment is implemented as follows:

[0005] On one hand, embodiments of this application provide a voltage conversion circuit, which includes: a voltage holding module, a voltage feedback module, and a voltage adjustment module;

[0006] The first input terminal of the voltage feedback module is connected to a first reference voltage, and the second input terminal of the voltage feedback module is connected to the feedback voltage of the voltage holding module; the output terminal of the voltage feedback module is connected to the input terminal of the voltage adjustment module; the output terminal of the voltage adjustment module is connected to the first input terminal of the voltage holding module; the second input terminal of the voltage holding module is connected to a preset external voltage.

[0007] The voltage feedback module is used to determine a target voltage based on the feedback voltage and the first reference voltage, and input the target voltage into the voltage adjustment module;

[0008] The voltage adjustment module is used to adjust the target voltage to obtain the adjusted target voltage, and input the adjusted target voltage into the voltage holding module;

[0009] The voltage holding module is used to adjust its output voltage based on the preset external voltage and the adjusted target voltage, so as to keep the output voltage of the voltage holding module in a stable state.

[0010] On the other hand, this application provides a display device, characterized in that the display device includes: a power management device and the voltage conversion circuit and display panel described above;

[0011] The power management device is used to provide a preset external voltage to the voltage conversion circuit;

[0012] The voltage conversion voltage is used to maintain the output voltage of the voltage conversion circuit based on the preset external voltage and the first reference voltage, and to provide the output voltage to the display panel;

[0013] The display panel is used to display an image based on the output voltage of the voltage conversion circuit. Furthermore, embodiments of this application provide a control method for a voltage conversion circuit, the method being applied to the aforementioned voltage conversion circuit, the method comprising:

[0014] The target voltage is determined based on the received feedback voltage and the first reference voltage;

[0015] The target voltage is adjusted to obtain the adjusted target voltage;

[0016] Based on the preset external voltage and the adjusted target voltage, the output voltage of the voltage conversion circuit is adjusted to keep the output voltage in a stable state.

[0017] In another aspect, embodiments of this application provide a computer device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the program to implement some or all of the steps in the above-described method.

[0018] In another aspect, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements some or all of the steps in the above-described method.

[0019] In another aspect, embodiments of this application provide a computer program including computer-readable code, wherein when the computer-readable code is run in a computer device, a processor in the computer device performs some or all of the steps for implementing the above-described method.

[0020] In another aspect, embodiments of this application provide a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program. When the computer program is read and executed by a computer, it implements some or all of the steps in the above-described method.

[0021] In this embodiment, in the voltage conversion circuit, the first input terminal of the voltage feedback module is connected to a first reference voltage, and the second input terminal of the voltage feedback module is connected to the feedback voltage of the output terminal of the voltage holding module. The output terminal of the voltage feedback module is connected to the input terminal of the voltage adjustment module. The output terminal of the voltage adjustment module is connected to the first input terminal of the voltage holding module. The second input terminal of the voltage holding module is connected to a preset external voltage. Thus, the voltage holding module, through the voltage connected to the output terminal of the voltage adjustment module and the preset external voltage, feeds back the feedback voltage of its output terminal to the voltage feedback module, enabling the voltage feedback module to adjust the target voltage using the feedback voltage and the first reference voltage, thereby maintaining the output voltage of the voltage holding module. The voltage feedback module is used to determine the target voltage based on the feedback voltage and the first reference voltage, and input the target voltage to the voltage adjustment module. The voltage adjustment module is used to adjust the target voltage to obtain the adjusted target voltage, and input the adjusted target voltage to the voltage holding module. The voltage holding module is used to maintain the output voltage of the voltage holding module based on the preset external voltage and the adjusted target voltage. In this way, the voltage feedback module analyzes the feedback voltage and the first reference voltage to obtain the target voltage, and then provides the target voltage to the voltage adjustment module. The voltage adjustment module adjusts the target voltage and provides the adjusted target voltage to the voltage holding module. Since the target voltage is determined by the feedback voltage at the output of the voltage holding module and the first reference voltage, the voltage holding module can adjust the output voltage of the voltage holding module by combining the preset external voltage and the adjusted target voltage, thereby reducing the voltage drop of the output voltage of the voltage holding module in the circuit. In this way, the target voltage can be adjusted, and thus the output voltage of the voltage holding module can be adjusted, so that the output voltage of the voltage holding module is in a stable state.

[0022] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of this disclosure. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the technical solutions of this application.

[0024] Figure 1 This is a schematic diagram of the composition structure of the voltage conversion circuit provided in the embodiments of this application;

[0025] Figure 2A This is a schematic diagram of another component structure of the voltage conversion circuit provided in the embodiments of this application;

[0026] Figure 2BThis is another schematic diagram of the structure of the voltage conversion circuit provided in the embodiments of this application;

[0027] Figure 2C This is a schematic diagram of the composition structure of the display device provided in the embodiments of this application;

[0028] Figure 3 A schematic diagram illustrating the implementation flow of the control method for the voltage conversion circuit provided in the embodiments of this application;

[0029] Figure 4 This is a schematic diagram of the structure of a DC-DC converter provided in some embodiments;

[0030] Figure 5 This is a schematic diagram of the circuit structure of the DC-DC converter provided in the embodiments of this application;

[0031] Figure 6 This is another schematic diagram of the structure of the voltage conversion circuit provided in the embodiments of this application;

[0032] Figure 7 This is a schematic diagram of the hardware entity of a computer device provided in an embodiment of this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application are further described in detail below with reference to the accompanying drawings and embodiments. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0035] The terms “first / second / third” are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that “first / second / third” may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application.

[0037] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0038] 1) Organic Light-Emitting Diode (OLED) is a current-driven organic light-emitting device that emits light through the injection and recombination of charge carriers. The luminous intensity is directly proportional to the injected current. In an OLED, holes generated at the anode and electrons at the cathode move and are injected into the hole transport layer and electron transport layer, respectively, migrating to the emissive layer. When these two electrons meet in the emissive layer, they generate excitons, which excite the light-emitting molecules to ultimately produce visible light.

[0039] 2) The integrated circuit (IC) industry continues to drive the development of the smartphone industry. Touch and display driver integration (TDDI) brings a unified system architecture. The original system architecture, because the display and touch chips were separate, could lead to some display noise. TDDI, however, achieves unified control, resulting in better noise management. TDDI uses a "time-division scanning" method, dividing one frame of display time into two parts: one part for touch scanning and the other for display scanning, without interference, fundamentally reducing the risk of signal interference.

[0040] This application provides a voltage conversion circuit. A voltage feedback module analyzes a feedback voltage and a first reference voltage to obtain a target voltage, which is then provided to a voltage adjustment module. The voltage adjustment module adjusts the target voltage and provides the adjusted target voltage to a voltage holding module. The voltage holding module, by combining a preset external voltage with the adjusted target voltage, adjusts its output voltage, thereby adjusting the target voltage and consequently the output voltage of the voltage holding module, reducing the voltage drop across the circuit. This voltage conversion circuit can be installed in a driver product. Driver products can refer to devices with display driving capabilities, such as laptops, tablets, desktop computers, smart TVs, set-top boxes, mobile devices (e.g., mobile phones, portable video players, personal digital assistants, dedicated messaging devices, portable gaming devices), and wearable devices.

[0041] Figure 1 This is a schematic diagram of the composition structure of the voltage conversion circuit provided in the embodiments of this application, combined with... Figure 1The voltage conversion circuit includes: a voltage holding module 101, a voltage feedback module 102, and a voltage adjustment module 103.

[0042] The first input terminal of the voltage feedback module 102 is connected to the first reference voltage 104, and the second input terminal of the voltage feedback module 102 is connected to the feedback voltage of the output terminal of the voltage holding module 101; the output terminal of the voltage feedback module 102 is connected to the input terminal of the voltage adjustment module 103; the output terminal of the voltage adjustment module 103 is connected to the first input terminal of the voltage holding module 101; and the second input terminal of the voltage holding module 101 is connected to a preset external voltage 105.

[0043] Here, the voltage feedback module can be implemented using a comparator and a multiplexer. The comparator compares the first reference voltage and the feedback voltage to control the input and output of the multiplexer. The first input terminal of the voltage feedback module is connected to the output terminal of the voltage holding module via a step-down resistor to receive the feedback voltage from the voltage holding module. The voltage adjustment module can be implemented using a multiplier, adjusting the input voltage and outputting the adjusted voltage to the voltage holding module. The voltage holding module can be implemented using a DC-DC converter, generating an output voltage from the voltages connected to the first and second input terminals and outputting it to the display panel or feeding it back to the voltage feedback module.

[0044] The voltage feedback module 102 is used to determine the target voltage based on the feedback voltage and the first reference voltage, and input the target voltage into the voltage adjustment module.

[0045] Here, the feedback voltage can be the voltage drop across the output voltage of the voltage holding module due to the load current in the circuit, fed back to the voltage feedback module. In some possible implementations, the feedback voltage can be reduced by a step-down resistor between the voltage feedback module and the voltage holding module before being fed back to the voltage feedback module. In this way, the magnitude of the feedback voltage can accurately reflect the magnitude of the output voltage of the voltage holding module. If the output voltage of the voltage holding module drops due to the load current of the display panel, the feedback voltage will immediately decrease, making the feedback voltage less than the first reference voltage. At this time, to reduce the voltage drop across the output voltage of the voltage holding module, the feedback voltage is used as the target voltage input to the voltage adjustment module, so that the voltage adjustment module can adjust the feedback voltage. If the feedback voltage is equal to the first reference voltage, it means that the output voltage of the voltage holding module is stable and can stably provide voltage to the display panel. Then, the first reference voltage is used as the target voltage output to the voltage adjustment module, so that the voltage adjustment module can provide the adjusted target voltage to the voltage holding module based on the first reference voltage.

[0046] The voltage adjustment module 103 is used to adjust the target voltage to obtain the adjusted target voltage, and input the adjusted target voltage into the voltage holding module 101.

[0047] Here, the voltage adjustment module 103 increases the target voltage provided by the voltage feedback module 102, thereby providing the adjusted target voltage to the voltage holding module 101. The output voltage includes both positive and negative voltages, which are used to drive the gate voltage of the transistors in the display panel, so that the transistors in the display panel are turned on, thereby enabling the display panel to display an image.

[0048] In some possible implementations, the voltage adjustment module is further configured to increase the target voltage based on a preset multiple, and use the increased target voltage as the adjusted target voltage. This preset multiple can be any value greater than 1. The voltage adjustment module 103 can increase the target voltage according to the preset multiple, for example, a preset multiple of 4, multiplying the target voltage by 4 to increase the target voltage and obtain the adjusted target voltage. In this way, the voltage adjustment module increases the target voltage by the preset multiple and feeds the increased target voltage back to the voltage holding module, thereby reducing the voltage drop of the voltage holding module's output voltage caused by the load current.

[0049] The voltage holding module 101 is used to adjust the output voltage of the voltage holding module based on the preset external voltage and the adjusted target voltage, so as to keep the output voltage of the voltage holding module in a stable state.

[0050] Here, in the voltage holding module 101, the preset external voltage and the adjusted target voltage can be added together, and the result is used as the output voltage. If there is a voltage drop in the output voltage due to the load current of the display panel, the output voltage is fed back to the voltage feedback module 102 through a step-down resistor. The voltage holding module 101 compensates for the voltage drop of the output voltage based on the preset external voltage and the adjusted target voltage, and outputs the compensated output voltage to the display panel to keep the voltage driving the display panel constant. In this way, the feedback voltage is increased by the voltage feedback module and the voltage adjustment module, thereby increasing the sum of the preset external voltage and the adjusted target voltage to compensate for the voltage drop of the output voltage of the voltage holding module, and thus keeping the output voltage of the voltage holding module in a stable state.

[0051] In this embodiment, the voltage holding module feeds back the feedback voltage from its output terminal to the voltage feedback module by connecting the voltage from the output terminal of the voltage adjustment module and a preset external voltage. This allows the voltage feedback module to adjust the target voltage using the feedback voltage and a first reference voltage, thereby maintaining the output voltage of the voltage holding module in a stable state. The voltage feedback module analyzes the feedback voltage and the first reference voltage to obtain the target voltage, which is then provided to the voltage adjustment module. The voltage adjustment module adjusts the target voltage and provides the adjusted target voltage to the voltage holding module. Since the target voltage is determined by the feedback voltage from the output terminal of the voltage holding module and the first reference voltage, the voltage holding module, by combining the preset external voltage and the adjusted target voltage, can adjust the output voltage of the voltage holding module, reducing the voltage drop across the circuit. This adjustment stabilizes the output voltage of the voltage holding module, providing a stable driving voltage to the display panel and enabling stable image display.

[0052] In some embodiments, the output voltage of the voltage holding module is controlled by incorporating multiple switches and multiple capacitors. The structure of the voltage holding module is as follows: Figure 2A As shown, the voltage holding module 101 includes: a first switch 201, a second switch 202, a third switch 203, a fourth switch 204, a first capacitor 205, and a second capacitor 206.

[0053] The first terminal of the first switch is connected to the preset external voltage, and the second terminal of the first switch is connected to the first terminal of the second switch and the first terminal of the first capacitor respectively; the second terminal of the second switch serves as the output terminal of the voltage holding module and is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the ground terminal.

[0054] The first terminal of the third switch is connected to the target voltage output by the voltage adjustment module, the second terminal of the third switch is connected to the second terminal of the first capacitor and the first terminal of the fourth switch, and the second terminal of the fourth switch is grounded.

[0055] Here, the first switch 201, the second switch 202, the third switch 203, and the fourth switch 204 can be switches of the same type but independent of each other, that is, whether one switch is closed or not does not affect the other switch.

[0056] When the first and second switches are closed and the third and fourth switches are open, the output voltage of the voltage holding module is the preset external voltage.

[0057] Here, the second terminal of the first switch is connected to the first terminal of the second switch, the second terminal of the second switch is grounded, and the first terminal of the first switch is connected to a preset external voltage. Thus, if the first and second switches are closed and the third and fourth switches are open, the voltage connected to the first terminal of the third switch cannot be transmitted to the second terminal of the second switch. That is, the path between the third switch and the second switch is broken. Therefore, the voltage output from the second terminal of the second switch is the preset external voltage, and the output voltage of the voltage holding module is the preset external voltage.

[0058] After the first switch and the fourth switch are closed and the first capacitor is turned on, the second switch and the third switch are closed. The output voltage of the voltage holding module is the sum of the preset external voltage and the adjusted target voltage.

[0059] Here, since one end of the first capacitor is connected between the first and second switches, and the other end is connected between the fourth and third switches, if the first and fourth switches are closed first, the first capacitor will conduct; then, if the second and third switches are closed, the voltage at the second end of the second switch, which is the output voltage of the voltage holding module, will be the sum of the voltages of the first and third switches. In other words, the output voltage is the sum of the preset external voltage and the adjusted target voltage.

[0060] In this embodiment, in the voltage holding module, by controlling the closing or opening of different switches, when the first switch and the second switch are closed, a preset external voltage is output from the output terminal of the voltage holding module; when the first switch and the fourth switch are closed first, and then the second switch and the third switch are closed, the sum of the preset external voltage and the adjusted target voltage is output from the output terminal of the voltage holding module; thus, the output voltage of the voltage holding module can be precisely adjusted.

[0061] In some embodiments, by introducing a comparison submodule and a switching submodule into the voltage feedback module, the comparison submodule is controlled to be turned on or off according to its comparison result, i.e., the output voltage of the voltage holding module is fed back to the comparison submodule. The structure of this voltage feedback module is as follows: Figure 2B As shown, the voltage feedback module 102 includes: a comparison submodule 221 and a switching submodule 222;

[0062] The first input terminal of the comparison submodule 221 is connected to the first reference voltage, and the second input terminal of the comparison submodule 221 is connected to the feedback voltage; the output terminal of the comparison submodule 221 is connected to the first input terminal of the switch submodule 222, the second input terminal of the switch submodule 222 is connected to the second reference voltage 223, and the output terminal of the switch submodule 222 is connected to the first input terminal of the voltage adjustment module.

[0063] Here, the comparator submodule 221 can be implemented using a feedback amplifier to compare the input voltage. For example, the comparator submodule 221 can be as follows: Figure 6 The feedback amplifier 61 shown feeds back the comparison result to the switching submodule to control the on / off state between the switching submodule and the comparison submodule. The first input terminal of the comparison submodule 221 is the first input terminal of the voltage feedback module 102, and the second input terminal of the comparison submodule 221 is the second input terminal of the voltage feedback module 102. The switching submodule 222 can be implemented using a multiplexer, for example, it could be... Figure 6 The MUX 62 shown is used as an input to the multiplexer, which is either the second reference voltage or the feedback voltage of the comparator submodule 221. The output of the switch submodule 222 is either the feedback voltage or the second reference voltage. The output terminal of the switch submodule 222 is the output terminal of the voltage feedback module and is also output to the voltage adjustment module.

[0064] The comparison submodule 221 is used to compare the first reference voltage and the feedback voltage to obtain a comparison result.

[0065] Here, the voltage holding module feeds back the output voltage from its output terminal to the first input terminal of the comparator submodule via a step-down resistor. The second input terminal of the comparator submodule 221 is connected to a first reference voltage, which can be determined by a preset external voltage and an input second reference voltage, where the second reference voltage is arbitrarily set. If the output voltage of the voltage holding module experiences a voltage drop due to the load current of the display panel, the feedback voltage will decrease, resulting in a feedback voltage lower than the first reference voltage. The feedback voltage is increased by the connected voltage adjustment module, stabilizing the output voltage of the voltage holding module and thus making the first reference voltage equal to the feedback voltage.

[0066] The switching submodule 222 is used to control the on / off state of the path between the comparison submodule 221 based on the comparison result, and to select the target voltage from the second reference voltage and the feedback voltage, and input the target voltage into the voltage adjustment module 103.

[0067] Thus, since the first reference voltage is greater than the feedback voltage, to maintain the stability of the output voltage of the voltage holding module, it is necessary to increase the input voltage of the voltage holding module. At this point, the switching submodule is turned on, and the feedback voltage is used as the target voltage. The feedback voltage is then transmitted to the voltage adjustment module through the switching submodule, which increases this target voltage to obtain the adjusted target voltage. In this way, the increased adjusted target voltage is combined with a preset external voltage in the voltage holding module to form the output voltage, thereby keeping the output voltage of the voltage holding module stable and preventing it from decreasing with the load current. After increasing the feedback voltage by opening the path between the comparator submodule 221 and the switching submodule 222, the voltage holding module again feeds the output voltage back to the comparator submodule. If the comparator submodule determines that the latest feedback voltage is equal to the first reference voltage, it closes the path between the switch submodule 222 and the comparator submodule 221. At this time, the comparator submodule 221 cannot transmit voltage to the switch submodule 222. The switch submodule 222 then transmits the connected second reference voltage to the voltage adjustment module to increase the second reference voltage. The increased second reference voltage is then transmitted to the voltage holding module to compensate for the voltage drop in the voltage holding module caused by the load current. Thus, in the voltage feedback module, the comparison result of the comparator submodule determines whether the path between the comparator submodule and the switch submodule is open, thereby enabling precise control of the voltage output from the switch submodule to the feedback submodule.

[0068] In some embodiments, if the output voltage of the voltage holding module drops due to the load current of the display panel, then to reduce this output voltage drop, the feedback voltage is output through the switching submodule to increase the feedback voltage. Figure 2B In the middle, the switch submodule 222 is used to open the path between the comparison submodule 221 and the comparison submodule 221 when the comparison result is that the feedback voltage is less than the first reference voltage, and output the feedback voltage as the target voltage to the voltage adjustment module.

[0069] Here, when the output voltage of the voltage holding module drops due to the load current of the display panel, the comparison result is that the feedback voltage is less than the first reference voltage. Since the output voltage of the voltage holding module drops due to the load current of the display panel, the feedback voltage fed back from the voltage holding module to the comparison submodule also decreases, thus the feedback voltage is less than the first reference voltage. To reduce the voltage drop of the output voltage of the voltage holding module, the path between the switching submodule and the comparison submodule is opened, allowing the comparison submodule to transmit the feedback voltage to the switching submodule 222.

[0070] The voltage adjustment module 103 is used to increase the feedback voltage by a preset multiple to obtain the adjusted target voltage.

[0071] Here, after receiving the target voltage, i.e. the feedback voltage, transmitted by the switch submodule, the voltage adjustment module 103 increases the feedback voltage by the preset multiple to obtain the adjusted target voltage; and transmits the adjusted target voltage to the voltage holding module.

[0072] The voltage holding module 101 is used to compensate for the voltage drop of the output voltage based on the adjusted target voltage and the preset external voltage, and to feed back the compensated voltage to the second input terminal of the comparison submodule, so that the compensated voltage received by the comparison submodule is equal to the first reference voltage.

[0073] Here, in the voltage holding module 101, the adjusted target voltage and the preset external voltage are added together, and the summation result is output through the output terminal of the voltage holding module 101. Since the adjusted target voltage is increased relative to the feedback voltage of the voltage holding module 101, adding the voltage holding module 101 and the preset external voltage reduces the voltage drop of the output voltage of the voltage holding module 101 caused by the load current, thus ensuring that the output voltage of the voltage holding module 101 remains constant with the load current. Therefore, after compensating for the voltage drop of the output voltage in the voltage holding module 101 using the adjusted target voltage and the preset external voltage, the compensated voltage is also increased relative to the output voltage that caused the voltage drop. Consequently, the compensated voltage fed back to the voltage feedback module by the voltage holding module 101 is also increased relative to the historical feedback voltage, thereby ensuring that the compensated voltage received by the comparison submodule is equal to the first reference voltage.

[0074] In this embodiment, when the feedback voltage is less than the first reference voltage, the path between the two is opened, thereby increasing the feedback voltage so that the feedback voltage fed back to the comparison submodule is equal to the first reference voltage, thereby maintaining the output voltage of the voltage holding module in a stable state.

[0075] In some embodiments, if the voltage feedback module ensures that the output voltage of the voltage holding module does not drop with the load current of the display panel, then to maintain the output voltage, the second reference voltage is output through the switching submodule to maintain the output voltage. Figure 2B In the above, the switching submodule 222 is used to disconnect the path between itself and the comparison submodule when the comparison result indicates that the first reference voltage and the feedback voltage are equal, and output the second reference voltage as the target voltage to the voltage adjustment module.

[0076] Here, the first reference voltage and the second reference voltage are different. The second reference voltage is a preset arbitrary voltage value. The first reference voltage is obtained by reducing the preset external voltage through a step-down resistor, and then reducing the second reference voltage through a step-down resistor, and finally connecting the stepped-down preset external voltage and the stepped-down second voltage in series.

[0077] In some possible implementations, by connecting the comparator submodule and the switch submodule, the voltage adjustment module increases the voltage input to the voltage holding module, thereby reducing the voltage drop in the voltage holding module caused by the load current. After the voltage drop in the output voltage of the voltage holding module is compensated, the feedback voltage from the voltage holding module to the comparator submodule can reach the first reference voltage. Therefore, if the first reference voltage and the feedback voltage are equal, it also indicates that the output voltage of the voltage holding module has not experienced a voltage drop with the load current, meaning that the output voltage is the same as the initial voltage of the voltage holding module at the start of the display panel's operation. In this case, to maintain the output voltage of the voltage holding module constant, the connection between the comparator submodule and the switch submodule is disconnected. Thus, a second reference voltage is input to the voltage adjustment module through the switch submodule, causing the voltage adjustment module to increase the second reference voltage.

[0078] The voltage adjustment module 103 is used to increase the second reference voltage by a preset multiple to obtain the adjusted target voltage.

[0079] Here, after receiving the second reference voltage transmitted by the switch submodule, the voltage adjustment module 103 increases the second reference voltage by the preset multiple to obtain the adjusted target voltage; and transmits the adjusted target voltage to the voltage holding module.

[0080] The voltage holding module 101 is used to compensate for the voltage drop of the output voltage based on the preset external voltage and the second reference voltage, and output the compensated output voltage to the display panel so that the voltage driving the display panel remains unchanged.

[0081] Here, in the voltage holding module 101, the preset external voltage and the second reference voltage are added together to form the output voltage, so that the output voltage of the voltage holding module 101 is stable during the display panel display process; in this way, after the output voltage is provided to the display panel, the voltage driving the display panel remains unchanged, thereby enabling the display panel to display images stably.

[0082] In some embodiments, a first reference voltage can be provided to the comparison submodule via a first resistor and a second resistor in the voltage feedback module.

[0083] The first end of the first resistor is connected to the preset external voltage, and the first end of the second resistor is connected to the second reference voltage. The second ends of the first resistor, the second ends of the second resistor, and the first input terminal of the comparison submodule of the voltage feedback module are connected to input the first reference voltage to the first input terminal of the comparison submodule through the voltage at the second ends of the first resistor and the second ends of the second resistor.

[0084] Here, the first end of the first resistor is connected to the preset external voltage, the first end of the second resistor is connected to the second reference voltage, and the second ends of the first and second resistors are connected together and then connected to the first input terminal of the comparator submodule. Thus, the input voltage of the first input terminal of the comparator submodule is the voltage at the connection point between the second ends of the first and second resistors. By connecting the first resistor to the preset external voltage, the preset external voltage can be reduced; by connecting the second resistor to the second reference voltage, the second reference voltage can be reduced; the two reduced voltages are connected in series as the input voltage of the first input terminal of the comparator submodule, i.e., the first reference voltage. Figure 6 As shown, the preset external voltage can be voltage AVDD 41, the second reference voltage can be voltage V_REF 64, the first resistor can be resistor R1 connected to voltage AVDD 41, and the second resistor can be resistor R2 connected to voltage V_REF 64. Thus, the first reference voltage is... Figure 6 The voltage FB_INP in the middle, the second reference voltage is... Figure 6 The voltage V_REF 64 in the system.

[0085] In this embodiment, by connecting two resistors to a preset external voltage and a second reference voltage respectively, the preset external voltage and the second reference voltage are reduced, thereby providing a lower voltage value to the comparison submodule, that is, low-voltage devices can be used, thereby reducing the cost of the voltage conversion circuit.

[0086] In some embodiments, by using a third resistor and a fourth resistor in the voltage feedback module, the output voltage fed back from the voltage holding module to the comparator submodule can be reduced, resulting in a smaller feedback voltage received by the comparator submodule. This allows for the use of a lower-cost comparator submodule, saving design costs for the voltage conversion circuit. In some possible implementations, the voltage feedback module 102 includes: a third resistor and a fourth resistor;

[0087] The first end of the third resistor, the second end of the second resistor, and the second input terminal of the comparison submodule of the voltage feedback module are connected. The second end of the third resistor is connected to the output terminal of the voltage holding module. The first end of the fourth resistor is connected to the ground terminal. The output voltage of the voltage holding module is reduced by the third resistor and the fourth resistor. The reduced output voltage is used as the feedback voltage and input to the comparison submodule.

[0088] Here, as Figure 6 As shown, the third resistor can be Figure 6 In the resistor R3, the fourth resistor can be Figure 6 The resistor R4 is used in the circuit. The third resistor and the first resistor can be the same or different, and the fourth resistor and the second resistor can be the same or different. One end of the third resistor is connected to the second input terminal of the comparator submodule, and one end of the fourth resistor is grounded, while the other end is connected in series with the third resistor. The output terminal of the voltage holding module is connected between the third resistor and the fourth resistor. In this way, the output voltage of the voltage holding module can be reduced through the third resistor and the fourth resistor. Since the output voltage of the voltage holding module is a high voltage, after reducing the output voltage of the voltage holding module through the third resistor and the fourth resistor, the comparator submodule that receives the feedback voltage does not need to use high-voltage devices, thereby saving the design cost of the entire circuit.

[0089] This application provides a display device, such as... Figure 2C As shown, the display device 230 includes: a power management device 231, a voltage conversion circuit 232 as described in the above embodiment, and a display panel 233;

[0090] The power management device 231 is used to provide a preset external voltage to the voltage conversion circuit 232.

[0091] Here, the power management device 231 can be an external power source, such as a fixed power source in a display device. The power management device 231 supplies its own power to the voltage conversion circuit 232.

[0092] The voltage conversion circuit 232 is used to maintain the output voltage of the voltage conversion circuit based on the preset external voltage and the first reference voltage, and to provide the output voltage to the display panel.

[0093] Here, the voltage conversion circuit 232 reduces the voltage drop of the output voltage of the voltage conversion circuit caused by the load current by using the preset external voltage and the first reference voltage, so as to maintain the output voltage of the voltage conversion circuit stable and provide a stable output voltage for the display panel.

[0094] Display panel 233 is used to display images based on the output voltage of the voltage conversion circuit.

[0095] Here, after the gate of the transistor in the display panel 233 receives the output voltage of the voltage conversion circuit, the transistor is turned on, and the display panel displays the image. Since the output voltage is stable and does not decrease with the load current in the display panel, the display panel can display stably based on the output voltage, thus improving the image display effect of the display panel.

[0096] This application provides a control method for a voltage conversion circuit, such as... Figure 3 As shown, this method can be achieved through Figure 3 The steps shown are to be implemented as follows:

[0097] Step S301: Determine the target voltage based on the received feedback voltage and the first reference voltage.

[0098] Here, in the voltage feedback module of the voltage conversion circuit, the voltage feedback module receives the feedback voltage from the output of the voltage holding module and the first reference voltage, and determines the target voltage by comparing the two voltages between the feedback voltage and the input second reference voltage.

[0099] Step S302: Adjust the target voltage to obtain the adjusted target voltage.

[0100] Here, in the voltage adjustment module of the voltage conversion circuit, the target voltage is increased, and the resulting adjusted target voltage is input to the voltage holding module.

[0101] Step S303: Based on the preset external voltage and the adjusted target voltage, adjust the output voltage of the voltage conversion circuit to keep the output voltage in a stable state.

[0102] Here, in the voltage holding module of the voltage conversion circuit, since the adjusted target voltage is obtained by increasing the target voltage, the combination of the preset external voltage and the adjusted target voltage can compensate for the voltage drop generated by the output voltage of the voltage conversion circuit, thereby keeping the output voltage of the voltage conversion circuit constant. Thus, since the target voltage is determined by the feedback voltage at the output of the voltage holding module and the first reference voltage, the voltage holding module can adjust its output voltage by combining the preset external voltage and the adjusted target voltage, reducing the voltage drop of the output voltage in the circuit. This stabilizes the output voltage of the voltage holding module, providing a stable driving voltage to the display panel and improving its display effect.

[0103] The following describes the application of the voltage conversion circuit provided in the embodiments of this application in a real-world scenario, taking a DC-DC converter with a feedback amplifier as an example.

[0104] Figure 4 This is a schematic diagram of the structure of a DC-DC converter provided in some embodiments, from... Figure 4 As can be seen, the input terminals of the DC-DC converter 401 are connected to AVDD 41 and VCI1 42, and the output terminals are VLOUT2 and VLOUT3. The DC-DC converter 401 is connected to capacitors 43 and 44 through different pins. Specifically, the positive terminal of capacitor 43 is C11P, and the negative terminal is C11N; the positive terminal of capacitor 44 is C12P, and the negative terminal is C12N; VLOUT2 = AVDD + VCI1, VLOUT3 = -|AVDD + VCI1|. Figure 5 As shown, AVDD 41 and VCI1 42 are each connected to a switch; AVDD 41 is connected to switch 51, and VCI1 42 is connected to switch 52. A capacitor C11 is connected between switches 51 and 52. One end of capacitor C11 is connected to switch 53, which is connected to the output voltage terminal VLOUT2. A capacitor 55 is connected between switch 53 and the output voltage terminal VLOUT2, with the other end of capacitor 55 grounded. The other end of capacitor C11 is connected to switch 54, which is grounded.

[0105] When the display panel operates under the driving voltage, that is, after the DC-DC converter 401 enters the working state, a current load is generated in the circuit. The output voltages VLOUT2 and VLOUT3 of the DC-DC converter decrease as the load current increases, so the power to drive the display panel decreases, making the display panel unable to display images as well.

[0106] Based on this, embodiments of this application provide a method for reducing the voltage drop of VLOUT2 as the current load changes by using a feedback amplifier on the output voltage of VLOUT2; such as Figure 6As shown, a feedback amplifier 61, a multiplexer (MUX) 62, and a VCI1 amplifier (VCI1 Amp) 63 are connected to the other end of VCI1 42. The inputs of MUX 62 are the output of VCI1 Amp 63 and the reference voltage V_REF 64. The inputs of VCI1 Amp 63 are FB_INN and FE_INP. FB_INN is the feedback voltage of VLOUT2, and FB_INP is the voltage generated by balancing the FB_INN voltage. FB_INP is the output voltage value after AVDD41 is connected to resistor R1 and the reference voltage V_REF 64 is connected to resistor R2. One end of VLOUT2 is connected to resistor R3, and resistor R3 is connected to resistor R4, with the other end of resistor R4 grounded. The voltage of VLOUT2 is divided by resistor R3 and fed back to FB_INN as input to VCI1 Amp 63. MUX62 acts like a switch. When MUX62 outputs ON, feedback amplifier 61 is used; when MUX62 outputs OFF, feedback amplifier 61 is not used. If VLOUT2 does not change with the load current, FB_INP and FB_INN are equal. Although MUX62 is on, it is the same as when it is off, meaning the MUX outputs VREF.

[0107] If AVDD = A, V_REF = B, and VCI1_Amp = 4 * B, then:

[0108] FB_INP=(R2*A+R1*B) / (R1+B2)=(AR2+BR1) / (R1+R2),

[0109] FB_INN = (R2*(A+4B)) / (R1+R2)

[0110] FB_INP = FB_INN, which means (AR2+BR1) / (R1+R2) = (R2*(A+4B)) / (R1+R2), and thus we can get AR2+BR1 = AR2+4BR2.

[0111] Based on this, BR1 = 4BR2. If B = 1, R1 = 4R2, so R2 = 1 and R1 = 4.

[0112] In some possible implementations, when a load current is generated in the circuit, VLOUT2 enters FB_INN through the connection between resistors R1 and R2, causing a change in VCI1. VLOUT2 and FB_INN are connected together, and FB_INN detects the voltage of VLOUT2 between the two resistors R1 and R2. If a voltage drop occurs in VLOUT2, FB_INN can quickly detect it. FB_INP is the input reference voltage; if a voltage drop occurs in FB_INN, the dropped voltage must be raised to keep the voltages of FB_INN and FB_INP consistent.

[0113] In this embodiment, if VLOUT2 experiences a voltage drop due to the load current, then FB_INP and FB_INN will be unequal, the feedback amplifier output will be ON, and the MUX will be turned on. The output voltage of the MUX will still be V_REF, and the voltage of VCI1 will be 4 times V_REF. In this way, the voltage of VCI1 will increase, thereby compensating for the voltage drop of VLOUT2, so that VLOUT2 remains stable and can continuously and stably drive the display panel.

[0114] Assuming AVDD = 6.0 volts (V), V_REF = 1.0V, VCI1 = 4.0V (V_REF * 4), and VLOUT2 = AVDD + VCI1 = 10.0V; when closed... Figure 6 In the case of feedback amplifier 61, the changes of VLOUT2 voltage and VCI1 voltage with load current are shown in Table 1:

[0115] Table 1. Relationship between VLOUT2 voltage, VCI1 voltage and load current when the feedback amplifier is turned off.

[0116]

[0117]

[0118] As can be seen from Table 1, when closed Figure 6 In the case of feedback amplifier 61, the voltage of VLOUT2 gradually decreases as the load current increases; the output voltage of amplifier VCI1 does not change with the load current.

[0119] Open Figure 6 In the case of feedback amplifier 61, the changes of VLOUT2 voltage and VCI1 voltage with load current are shown in Table 2:

[0120] 0mA 4.00 10.0 1mA 4.05 10.0 2mA 4.10 10.0 3mA 4.15 10.0 5mA 4.25 10.0 8mA 4.40 10.0 10mA 4.50 10.0

[0121] As can be seen from Table 2, when opening Figure 6In the case of feedback amplifier 61, the output voltage of amplifier VCI1 gradually increases with the increase of load current; while the voltage of VLOUT2 remains unchanged during the process of increasing load current.

[0122] In this embodiment, by introducing a feedback amplifier into the DC-DC converter, the voltage of VCI1 increases with the increase of the load current, thereby reducing the voltage drop of VLOUT2 with the increase of the load current. As a result, the voltage of VLOUT2 remains constant as the load current increases. This provides stable driving power to the display panel, enabling the display panel to operate stably.

[0123] Based on the foregoing embodiments, this application provides a driving device for a voltage conversion circuit. The device includes various units and modules included in each unit, which can be implemented by a processor in a computer device; of course, it can also be implemented by specific logic circuits. In the implementation process, the processor can be a central processing unit (CPU), a microprocessor unit (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA), etc.

[0124] It should be noted that, in the embodiments of this application, if the above-described voltage conversion circuit driving method is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to the related technology, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memory (ROM), magnetic disks, or optical disks. Thus, the embodiments of this application are not limited to any specific hardware, software, or firmware, or any combination of hardware, software, and firmware.

[0125] This application provides a computer device including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the program, it implements some or all of the steps in the above-described method.

[0126] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements some or all of the steps in the above-described method. The computer-readable storage medium can be transient or non-transient.

[0127] This application provides a computer program including computer-readable code, wherein when the computer-readable code is executed in a computer device, a processor in the computer device performs some or all of the steps in the above-described method.

[0128] This application provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program. When the computer program is read and executed by a computer, it implements some or all of the steps in the above-described method. This computer program product can be implemented specifically through hardware, software, or a combination thereof. In some embodiments, the computer program product is specifically embodied as a computer storage medium; in other embodiments, the computer program product is specifically embodied as a software product, such as a software development kit (SDK), etc.

[0129] It should be noted that the descriptions of the various embodiments above tend to emphasize the differences between them, while their similarities or commonalities can be referred to interchangeably. The descriptions of the above embodiments of the device, storage medium, computer program, and computer program product are similar to the descriptions of the above method embodiments and have similar beneficial effects. For technical details not disclosed in the embodiments of the device, storage medium, computer program, and computer program product of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0130] It should be noted that, Figure 7 This is a schematic diagram of a hardware entity of a computer device in an embodiment of this application, such as... Figure 7 As shown, the hardware entity of the computer device 700 includes: a processor 701, a communication interface 702, and a memory 703, wherein:

[0131] Processor 701 typically controls the overall operation of computer device 700.

[0132] Communication interface 702 enables computer devices to communicate with other terminals or servers over a network.

[0133] The memory 703 is configured to store instructions and applications executable by the processor 701, and can also cache data to be processed or already processed (e.g., image data, audio data, voice communication data, and video communication data) in the processor 701 and various modules in the computer device 700. It can be implemented using flash memory or random access memory (RAM). Data transfer between the processor 701, the communication interface 702, and the memory 703 can be performed via bus 704.

[0134] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above steps / processes do not imply a sequential order of execution; the execution order of each step / 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. The sequence numbers of the above embodiments of this application are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0135] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0137] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0138] In addition, each functional unit in the various embodiments of this application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0139] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, read-only memory (ROM), magnetic disks, or optical disks.

[0140] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence or the part that contributes to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, magnetic disks, or optical disks.

[0141] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A voltage conversion circuit, characterized in that, The voltage conversion circuit includes: a voltage holding module, a voltage feedback module, and a voltage adjustment module; the voltage feedback module includes: a comparison submodule and a switching submodule; The first input terminal of the comparison submodule is connected to a first reference voltage, and the second input terminal of the comparison submodule is connected to the feedback voltage of the voltage holding module; the output terminal of the comparison submodule is connected to the first input terminal of the switching submodule, the second input terminal of the switching submodule is connected to a second reference voltage, and the output terminal of the switching submodule is connected to the input terminal of the voltage adjustment module; the output terminal of the voltage adjustment module is connected to the first input terminal of the voltage holding module; the second input terminal of the voltage holding module is connected to a preset external voltage. The comparison submodule is used to compare the first reference voltage and the feedback voltage to obtain a comparison result; The switching submodule is used to control the on / off state of the path between itself and the comparison submodule based on the comparison result, and to select a target voltage from the second reference voltage and the feedback voltage, and input the target voltage into the voltage adjustment module. The voltage adjustment module is used to adjust the target voltage to obtain the adjusted target voltage, and input the adjusted target voltage into the voltage holding module; The voltage holding module is used to adjust the output voltage of the voltage holding module based on the preset external voltage and the adjusted target voltage, so as to keep the output voltage of the voltage holding module in a stable state.

2. The voltage conversion circuit according to claim 1, characterized in that, The voltage adjustment module is also used to increase the target voltage based on a preset multiple, and use the increased target voltage as the adjusted target voltage.

3. The voltage conversion circuit according to claim 1, characterized in that, The voltage holding module includes: a first switch, a second switch, a third switch, a fourth switch, a first capacitor, and a second capacitor; The first terminal of the first switch is connected to the preset external voltage, and the second terminal of the first switch is connected to the first terminal of the second switch and the first terminal of the first capacitor respectively; the second terminal of the second switch serves as the output terminal of the voltage holding module and is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the ground terminal. The first terminal of the third switch is connected to the target voltage output by the voltage adjustment module, the second terminal of the third switch is connected to the second terminal of the first capacitor and the first terminal of the fourth switch respectively, and the second terminal of the fourth switch is grounded. When the first switch and the second switch are closed, and the third switch and the fourth switch are open, the output voltage of the voltage holding module is the preset external voltage; After the first switch and the fourth switch are closed and the first capacitor is turned on, the second switch and the third switch are closed. The output voltage of the voltage holding module is the sum of the preset external voltage and the adjusted target voltage.

4. The voltage conversion circuit according to claim 1, characterized in that, When the output voltage of the voltage holding module drops due to the load current of the display panel, the comparison result is that the feedback voltage is less than the first reference voltage; The switching submodule is used to open the path between itself and the comparison submodule and output the feedback voltage as the target voltage to the voltage adjustment module when the comparison result is that the feedback voltage is less than the first reference voltage. The voltage adjustment module is used to increase the feedback voltage by a preset multiple to obtain the adjusted target voltage; The voltage holding module is used to compensate for the voltage drop of the output voltage based on the adjusted target voltage and the preset external voltage, and to feed back the compensated voltage to the second input terminal of the comparison submodule, so that the compensated voltage received by the comparison submodule is equal to the first reference voltage.

5. The voltage conversion circuit according to claim 1, characterized in that, The switching submodule is used to disconnect the path between itself and the comparison submodule when the comparison result indicates that the first reference voltage and the feedback voltage are equal, and to output the second reference voltage as the target voltage to the voltage adjustment module. The voltage adjustment module is used to increase the second reference voltage by a preset multiple to obtain the adjusted target voltage; The voltage holding module is used to compensate for the voltage drop of the output voltage based on the preset external voltage and the second reference voltage, and output the compensated output voltage to the display panel so that the voltage driving the display panel remains unchanged.

6. The voltage conversion circuit according to claim 1, characterized in that, The voltage feedback module further includes: a first resistor and a second resistor; The first end of the first resistor is connected to the preset external voltage, and the first end of the second resistor is connected to the second reference voltage. The second ends of the first resistor, the second ends of the second resistor, and the first input terminal of the comparison submodule of the voltage feedback module are connected to input the first reference voltage to the first input terminal of the comparison submodule through the voltage at the second ends of the first resistor and the second ends of the second resistor.

7. The voltage conversion circuit according to claim 1, characterized in that, The voltage feedback module further includes: a third resistor and a fourth resistor; The first end of the third resistor, the second end of the fourth resistor, and the second input end of the comparison submodule of the voltage feedback module are connected. The second end of the third resistor is connected to the output end of the voltage holding module, and the first end of the fourth resistor is connected to the ground terminal. The output voltage of the voltage holding module is reduced by the third resistor and the fourth resistor, and the reduced output voltage is used as the feedback voltage and input to the comparison submodule.

8. A display device, characterized in that, The display device includes: a power management device and a voltage conversion circuit and a display panel as described in any one of claims 1 to 7; The power management device is used to provide a preset external voltage to the voltage conversion circuit; The voltage conversion circuit is used to maintain the output voltage of the voltage conversion circuit based on the preset external voltage and the first reference voltage, and to provide the output voltage to the display panel; The display panel is used to display images based on the output voltage of the voltage conversion circuit.

9. A control method for a voltage conversion circuit, characterized in that, The method is applied to the voltage conversion circuit according to any one of claims 1 to 7, and the method includes: The target voltage is determined based on the received feedback voltage and the first reference voltage; The target voltage is adjusted to obtain the adjusted target voltage; Based on the preset external voltage and the adjusted target voltage, the output voltage of the voltage conversion circuit is adjusted to keep the output voltage in a stable state.

10. A computer device comprising a memory and a processor, the memory storing a computer program executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method of claim 9.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 9.

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