Drive voltage adjustment circuit, drive circuit and display device

Abstract

This application provides a driving voltage adjustment circuit, a driving circuit, and a display device, relating to the field of liquid crystal display technology. The circuit includes a high-pass filter, an amplification module, and an adder module. The input terminal of the high-pass filter is connected to the negative power supply terminal, the output terminal of the high-pass filter is connected to the first input terminal of the amplification module, the output terminal of the amplification module is connected to the second input terminal of the amplification module, the first input terminal of the adder module is connected to the output terminal of the amplification module, the first input terminal of the adder module is connected to either the positive or negative power supply terminal, and the second input terminal of the adder module is connected to the output terminal of the adder module. The output terminal of the adder module is used to output a mixed voltage. The technical solution provided by this application cancels the AC voltage in the negative power supply voltage by using the AC voltage of the mixed voltage, thus keeping the difference between the negative and positive power supply voltages stable. This effectively suppresses display brightness flicker and improves display quality and user experience.

Description

Technical Field

[0001] This application belongs to the field of liquid crystal display technology, and particularly relates to a driving voltage adjustment circuit, a driving circuit, and a display device. Background Technology

[0002] In organic light-emitting diode (OLED) display devices, OLEDs can be driven by various driving circuits to make them emit light and complete the display.

[0003] like Figure 1 As shown, Figure 1 This is a circuit diagram of a 7T1C driving circuit for an OLED pixel. During the touch scanning process, since the display and touch systems share some traces and electrodes inside the device, the high-frequency square wave signal output by the touch driver chip will be coupled to the driving circuit of the OLED through parasitic capacitance, such as being coupled to the negative power supply terminal ELVSS of the OLED.

[0004] However, since the positive electrode supply voltage ELVDD of OLED is usually kept constant, the voltage difference across the OLED will fluctuate, causing screen flickering or uneven brightness. Summary of the Invention

[0005] This application provides a driving voltage adjustment circuit, a driving circuit, and a display device, which solves the problem of voltage difference fluctuations across OLED terminals in the prior art, which causes screen flickering or uneven brightness.

[0006] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, embodiments of this application provide a driving voltage adjustment circuit, the circuit comprising: a high-pass filter, an amplification module, and an addition module; The input terminal of the high-pass filter is connected to the negative power supply terminal, and the high-pass filter is used to extract the AC voltage in the negative power supply voltage. The output terminal of the high-pass filter is connected to the first input terminal of the amplification module, and the output terminal of the amplification module is connected to the second input terminal of the amplification module. The amplification module is used to amplify the AC voltage. The first input terminal of the adder module is connected to the output terminal of the amplification module, and the first input terminal of the adder module is also connected to the positive power supply terminal or the negative power supply terminal. The second input terminal of the adder module is connected to the output terminal of the adder module. The output terminal of the adder module is used to output a mixed voltage, which is obtained by superimposing the positive supply voltage or the negative supply voltage with the AC voltage, and is used to cancel the AC voltage in the negative supply voltage.

[0007] Optionally, the addition module includes: an addition operational amplifier and multiple resistors; The positive input terminal of the adder operational amplifier is the first input terminal of the adder module, the negative input terminal of the adder operational amplifier is the second input terminal of the adder module, and the output terminal of the adder operational amplifier is the output terminal of the adder module; The positive input terminal of the adder operational amplifier is connected to the output terminal of the amplification module through at least one of the resistors. The positive input terminal of the adder operational amplifier is also connected to the positive power supply terminal or the negative power supply terminal through at least one of the resistors. The negative input terminal of the adder operational amplifier is connected to ground potential through at least one of the resistors, and the negative input terminal of the adder operational amplifier is also connected to the output terminal of the adder operational amplifier through at least one of the resistors.

[0008] Optionally, the plurality of resistors include: a first access resistor, a second access resistor, a grounding resistor, and a feedback resistor; The second terminals of both the first and second access resistors are connected to the positive input terminal of the adder operational amplifier; The first end of the first access resistor is connected to the positive power supply terminal or the negative power supply terminal, and the first end of the second access resistor is connected to the output terminal of the amplification module. The first terminals of both the grounding resistor and the feedback resistor are connected to the negative input terminal of the adder operational amplifier; The second end of the grounding resistor is connected to the ground potential, and the second end of the feedback resistor is connected to the output of the adder operational amplifier.

[0009] Optionally, if the first input terminal of the addition module is connected to the positive power supply terminal, the circuit further includes a positive power supply module, which is used to provide the positive power supply voltage.

[0010] Optionally, the positive power supply module includes: a gate driver chip, a switch group, a memory module, a first operational amplifier, a second operational amplifier, an oscillator, and a reference source; The input terminal of the gate driver chip is connected to the output terminal of the second operational amplifier, and the output terminal of the gate driver chip is connected to the control terminal of the switch group. The output terminal of the switch group is connected to the input terminal of the storage module, and the output terminal of the storage module is the positive power supply terminal of the positive power supply module. The first input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier, and the second input terminal of the second operational amplifier is connected to the oscillator; The first input terminal of the first operational amplifier is connected to the positive power supply terminal, the second input terminal of the first operational amplifier is connected to the output terminal of the reference source, and the input terminal of the reference source is connected to the output terminal of the adder module.

[0011] Optionally, if the first input terminal of the addition module is connected to the negative power supply terminal, the circuit further includes: an inverter; The input terminal of the inverter is connected to the output terminal of the amplification module, and the output terminal of the inverter is connected to the first input terminal of the addition module.

[0012] Optionally, the amplification module includes: a signal operational amplifier, a feedback resistor, and a grounding resistor; The first input terminal of the signal operational amplifier is the input terminal of the amplification module and is connected to the output terminal of the high-pass filter; The second input terminal of the signal operational amplifier is connected to ground potential through the grounding resistor; The output terminal of the signal operational amplifier is the output terminal of the amplification module, and is connected to the second input terminal of the signal operational amplifier through the feedback resistor.

[0013] Optionally, the high-pass filter includes: a filter capacitor and a filter resistor; The first terminal of the filter capacitor is the input terminal of the high-pass filter; The first terminal of the filter resistor is connected to ground potential; The second terminal of the filter capacitor and the second terminal of the filter resistor are connected to serve as the output terminal of the high-pass filter.

[0014] In a second aspect, embodiments of this application provide a driving circuit, the driving circuit comprising: a light-emitting diode and a driving voltage adjustment circuit as described in any of the first aspects; The driving voltage adjustment circuit is connected to the light-emitting diode and is used to drive the light-emitting diode to emit light.

[0015] Thirdly, embodiments of this application provide a display device, the display device comprising: a display screen and a driving circuit as described in the second aspect; The driving circuit is connected to the display screen and is used to drive the display screen to display images.

[0016] This application provides a driving voltage adjustment circuit that sequentially connects a high-pass filter, an amplification module, and an adder module. The high-pass filter extracts the AC voltage from the negative power supply voltage, the amplification module amplifies the AC voltage, and the adder module superimposes the positive or negative power supply voltage with the amplified AC voltage to obtain a mixed voltage. The AC voltage in the mixed voltage can cancel the AC voltage in the negative power supply voltage, keeping the difference between the negative and positive power supply voltages stable. This effectively suppresses display brightness flicker and improves display quality and user experience. Attached Figure Description

[0017] Figure 1 A circuit diagram of a 7T1C driving circuit for an OLED pixel; Figure 2 This is a schematic diagram of the structure of a display device involving a driving circuit for adjusting the driving voltage as described in an embodiment of this application. Figure 3 A circuit diagram of a drive voltage adjustment circuit provided in an embodiment of this application; Figure 4 A circuit diagram of another driving voltage adjustment circuit provided in an embodiment of this application; Figure 5 A circuit diagram of another driving voltage adjustment circuit provided in an embodiment of this application; Figure 6 A circuit diagram of a positive power supply module provided in an embodiment of this application; Figure 7 This is a circuit diagram of another driving voltage adjustment circuit provided in an embodiment of this application. Detailed Implementation

[0018] In the following description, specific details such as particular system architectures and technologies are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known driving technologies, driving circuits, and display devices are omitted so as not to obscure the description of this application with unnecessary detail.

[0019] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “the,” “the,” and “the” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0020] In OLED display devices, OLEDs can be driven by various driving circuits to emit light and complete the display.

[0021] During touch scanning, the touch driver chip outputs a high-frequency square wave signal (TX signal) to detect capacitance changes. Since the display and touch systems share some traces and electrodes within the module, the TX signal is coupled to the power supply network of the OLED display driver through parasitic capacitance, especially to the negative power supply terminal ELVSS of the OLED.

[0022] According to the calculation formula of the OLED driving circuit, the brightness of a pixel is directly determined by the positive electrode supply voltage ELVDD. When the TX signal is coupled to ELVSS and ground potential GND, the ELVSS voltage and GND will couple AC components, exhibiting the same periodic fluctuations; while ELVDD usually remains constant. This causes the voltage difference across the OLED to fluctuate, resulting in periodic changes in display brightness, manifested as screen flickering or uneven brightness, especially noticeable in low-brightness display modes.

[0023] Therefore, this application proposes a driving voltage adjustment circuit. By sequentially connecting a high-pass filter, an amplification module, and an adder module, the high-pass filter extracts the AC voltage from the negative power supply voltage, the amplification module amplifies the AC voltage, and the adder module superimposes the positive or negative power supply voltage with the amplified AC voltage to obtain a mixed voltage. The AC voltage in the mixed voltage can cancel the AC voltage in the negative power supply voltage, keeping the difference between the negative and positive power supply voltages stable. This effectively suppresses display brightness flicker and improves display quality and user experience.

[0024] See Figure 2 , Figure 2 This is a schematic diagram of the structure of a display device involving a driving circuit for adjusting the driving voltage according to an embodiment of this application. The display device may include a display screen 210 and a driving circuit 220.

[0025] The driving circuit 210 can be connected to the display screen 220 to drive the display screen 210 to display images.

[0026] Furthermore, the driving circuit 220 may include a light-emitting diode 221 and a driving voltage adjustment circuit 222. Accordingly, the driving voltage adjustment circuit 222 may be connected to the light-emitting diode 221 and drive the light-emitting diode 221 to emit light.

[0027] Specifically, during the display process, the driving voltage adjustment circuit 222 can drive each light-emitting diode 221 to emit light, and the voltage difference between the positive and negative output terminals of the driving voltage adjustment circuit 222 can remain stable, so that the voltage across the light-emitting diode 221 can remain stable, thereby avoiding flickering or uneven brightness of the light-emitting diode 221.

[0028] It should be noted that in practical applications, the driving voltage adjustment circuit 222 can be connected to one light-emitting diode 221 to drive one light-emitting diode 221, or it can be connected to multiple light-emitting diodes 221 to drive multiple light-emitting diodes 221 to emit light simultaneously. The embodiments of this application do not specifically limit the number of light-emitting diodes 221 driven by the driving voltage adjustment circuit 222.

[0029] The following is a detailed description of the drive voltage adjustment circuit.

[0030] Figure 3 A circuit diagram of a drive voltage adjustment circuit provided in this application embodiment is provided as an example and not as a limitation. See also Figure 3 The circuit includes a high-pass filter 310, an amplifier module 320, and an adder module 330.

[0031] The input terminal of the high-pass filter 310 can be connected to the negative power supply terminal (ELVSS). Furthermore, the output terminal of the high-pass filter 310 can be connected to the first input terminal of the amplifier module 320, and the output terminal of the amplifier module 320 can be connected to the second input terminal of the amplifier module 320.

[0032] In addition, the first input terminal of the adder module 330 is connected to the output terminal of the amplification module 320, and the first input terminal of the adder module 330 is also connected to the positive power supply terminal (ELVDD) or the negative power supply terminal. The second input terminal of the adder module 330 is connected to the output terminal of the adder module 330.

[0033] Correspondingly, after receiving the negative power supply voltage, the high-pass filter 310 can filter the negative power supply voltage through high-pass filtering, retain the AC voltage, and input the AC voltage into the amplification module 320, which amplifies the AC voltage.

[0034] Then, the amplified AC voltage can be input into the adder module 330. The adder module 330 will then superimpose the amplified AC voltage with the positive or negative power supply voltage to obtain a mixed voltage. The AC voltage superimposed in the mixed voltage can then be used to cancel out the AC voltage that causes voltage fluctuations in the negative power supply voltage.

[0035] Further, see Figure 4 , Figure 4 The circuit diagram of another driving voltage adjustment circuit provided in the embodiment of this application shows that the amplification module 320 may include: a signal operational amplifier 321, a feedback resistor 322, and a grounding resistor 323.

[0036] The first input terminal of the signal operational amplifier 321 is the input terminal of the amplification module 320 and can be connected to the output terminal of the high-pass filter 310.

[0037] Furthermore, the second input terminal of the signal operational amplifier 321 can be connected to ground potential (GND) through the grounding resistor 323.

[0038] In addition, the output terminal of the signal operational amplifier 321 is the output terminal of the amplification module 320, and can be connected to the second input terminal of the signal operational amplifier 321 through the feedback resistor 322.

[0039] For example, the signal operational amplifier 321 can be a non-inverting amplifier with an adjustable gain range of 1 to 3 times.

[0040] Specifically, the AC voltage can be input to the first input terminal of the signal operational amplifier 321, and combined with the feedback signal input to the second input terminal of the signal operational amplifier 321, the AC voltage is amplified to obtain the amplified AC voltage.

[0041] Additionally, see Figure 4 The high-pass filter 310 may include a filter capacitor 311 and a filter resistor 312.

[0042] In this design, the first terminal of the filter capacitor 311 is the input terminal of the high-pass filter 310, and the first terminal of the filter resistor 312 can be connected to ground (GND). Furthermore, the second terminal of the filter capacitor 311 can be connected to the second terminal of the filter resistor 312, serving as the output terminal of the high-pass filter 310.

[0043] Correspondingly, the negative power supply voltage can be filtered by the filter capacitor 311 and the filter resistor 312. By adjusting the parameters of the filter capacitor 311 and the filter resistor 312, the low frequency band in the negative power supply voltage is filtered out, while the high frequency AC voltage is retained. Thus, it can enter the amplification module 320 through the output of the high-pass filter 310.

[0044] In one alternative embodiment, see Figure 4 The adder module 330 may include an adder operational amplifier 331 and multiple resistors 332.

[0045] The positive input terminal of the adder operational amplifier 331 is the first input terminal of the adder module 330, the negative input terminal of the adder operational amplifier 331 is the second input terminal of the adder module 330, and the output terminal of the adder operational amplifier 331 is the output terminal of the adder module 330.

[0046] Furthermore, the positive input terminal of the adder operational amplifier 331 can be connected to the output terminal of the amplification module 320 through at least one resistor 332, and the positive input terminal of the adder operational amplifier 331 can also be connected to the positive power supply terminal or the negative power supply terminal through at least one resistor 332.

[0047] In addition, the negative input terminal of the adder operational amplifier 331 can be connected to ground potential through at least one resistor 332, and the negative input terminal of the adder operational amplifier 331 can also be connected to the output terminal of the adder operational amplifier 331 through at least one resistor 332.

[0048] Specifically, the amplified AC voltage can be superimposed on the positive or negative power supply voltage through the positive input terminal of the adder operational amplifier 331, and combined with the feedback signal input to the negative input terminal of the adder operational amplifier 331 to output a mixed signal. Thus, the AC voltage in the mixed signal can cancel the AC voltage in the negative power supply voltage.

[0049] Further, see Figure 5 , Figure 5 The circuit diagram of another driving voltage adjustment circuit provided in the embodiment of this application shows that the multiple resistors 332 may include: a first access resistor 332a, a second access resistor 332b, a grounding resistor 332c, and a feedback resistor 332d.

[0050] The second ends of the first access resistor 332a and the second access resistor 332b can both be connected to the positive input terminal of the adder operational amplifier 331. The first end of the first access resistor 332a is connected to the positive power supply terminal or the negative power supply terminal, and the first end of the second access resistor 332b is connected to the output terminal of the amplification module 320.

[0051] Furthermore, the first terminals of the grounding resistor 332c and the feedback resistor 332d can both be connected to the negative input terminal of the adder operational amplifier 331, while the second terminal of the grounding resistor 332c can be connected to the ground potential, and the second terminal of the feedback resistor 332d can be connected to the output terminal of the adder operational amplifier.

[0052] In another alternative embodiment, see Figure 6 , Figure 6This is a circuit diagram of a positive power supply module provided in an embodiment of this application. If the first input terminal of the adder module 330 is connected to the positive power supply terminal, the circuit further includes a positive power supply module 340. Moreover, the positive power supply module 340 may include a gate driver chip 341, a switch group 342, a memory module 343, a first operational amplifier 344, a second operational amplifier 345, an oscillator 346, and a reference source 347.

[0053] Among them, the positive power supply module 340 is used to provide the positive power supply voltage.

[0054] Furthermore, the input terminal of the gate driver chip 341 can be connected to the output terminal of the second operational amplifier 345, the output terminal of the gate driver chip 342 is connected to the control terminal of the switch group 342, the output terminal of the switch group 342 is connected to the input terminal of the storage module 343, and the output terminal of the storage module 343 is the positive power supply terminal of the positive power supply module.

[0055] In addition, the first input terminal of the second operational amplifier 345 is connected to the output terminal of the first operational amplifier 344, and the second input terminal of the second operational amplifier 345 is connected to the oscillator 346; the first input terminal of the first operational amplifier 344 is connected to the positive power supply terminal, the second input terminal of the first operational amplifier 344 is connected to the output terminal of the reference source 347, and the input terminal of the reference source 347 is connected to the output terminal of the adder module 330.

[0056] Specifically, the gate driver chip 341 can generate a PWM wave with opposite phase to control the switching power supply of the switch group 342 (such as a metal oxide semiconductor field effect transistor (MOSFET)) to generate an ELVDD voltage.

[0057] Furthermore, since the reference voltage (Vref) is usually a stable voltage, feedback stabilizes ELVDD. In this application, however, Vref can vary with the fluctuations of ELVSS, causing ELVDD to vary along with Vref, and the magnitude of the variation is consistent with that of ELVSS, thereby keeping the voltage difference between ELVDD and ELVSS stable.

[0058] In yet another alternative embodiment, see Figure 7 , Figure 7 This is a circuit diagram of another driving voltage adjustment circuit provided in an embodiment of this application. If the first input terminal of the adder module 330 is connected to the negative power supply terminal, the circuit further includes an inverter 350.

[0059] The input terminal of the inverter 350 can be connected to the output terminal of the amplifier module 320, and the output terminal of the inverter 350 can be connected to the first input terminal of the adder module 330.

[0060] and Figure 6 The difference in the proposed scheme is that the first input terminal of the adder module 330 is connected to the negative power supply terminal, that is, Figure 7 The proposed solution does not adjust ELVDD. Instead, it detects the TX interference signal coupled to ELVSS, generates a cancellation signal with the same amplitude but opposite phase to the interference signal, and injects it into the ELVSS circuit to directly cancel the fluctuations on ELVSS, thereby maintaining the stability of the voltage difference between ELVDD and ELVSS. Figure 7 As shown, after the AC voltage of ELVSS is filtered, it can be added back to ELVSS after passing through inverter 350.

[0061] In summary, the driving voltage adjustment circuit proposed in this application connects a high-pass filter, an amplification module, and an adder module in sequence. The high-pass filter extracts the AC voltage from the negative power supply voltage, the amplification module amplifies the AC voltage, and the adder module superimposes the positive or negative power supply voltage with the amplified AC voltage to obtain a mixed voltage. The AC voltage in the mixed voltage can cancel the AC voltage in the negative power supply voltage, keeping the difference between the negative and positive power supply voltages stable. This effectively suppresses display brightness flicker and improves display quality and user experience.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In the embodiments provided in this application, it should be understood that the disclosed apparatus / devices and methods can be implemented in other ways. For example, the apparatus / device 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 coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0066] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0067] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0068] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0069] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0070] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0071] Finally, it should be noted that the above 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A driving voltage adjustment circuit, characterized in that, The circuit includes: a high-pass filter, an amplification module, and an addition module; The input terminal of the high-pass filter is connected to the negative power supply terminal, and the high-pass filter is used to extract the AC voltage in the negative power supply voltage. The output terminal of the high-pass filter is connected to the first input terminal of the amplification module, and the output terminal of the amplification module is connected to the second input terminal of the amplification module. The amplification module is used to amplify the AC voltage. The first input terminal of the adder module is connected to the output terminal of the amplification module, and the first input terminal of the adder module is also connected to the positive power supply terminal or the negative power supply terminal. The second input terminal of the adder module is connected to the output terminal of the adder module. The output terminal of the adder module is used to output a mixed voltage, which is obtained by superimposing the positive supply voltage or the negative supply voltage with the AC voltage, and is used to cancel the AC voltage in the negative supply voltage.

2. The circuit according to claim 1, characterized in that, The addition module includes: an addition operational amplifier and multiple resistors; The positive input terminal of the adder operational amplifier is the first input terminal of the adder module, the negative input terminal of the adder operational amplifier is the second input terminal of the adder module, and the output terminal of the adder operational amplifier is the output terminal of the adder module; The positive input terminal of the adder operational amplifier is connected to the output terminal of the amplification module through at least one of the resistors. The positive input terminal of the adder operational amplifier is also connected to the positive power supply terminal or the negative power supply terminal through at least one of the resistors. The negative input terminal of the adder operational amplifier is connected to ground potential through at least one of the resistors, and the negative input terminal of the adder operational amplifier is also connected to the output terminal of the adder operational amplifier through at least one of the resistors.

3. The circuit according to claim 2, characterized in that, The plurality of resistors include: a first access resistor, a second access resistor, a grounding resistor, and a feedback resistor; The second terminals of both the first and second access resistors are connected to the positive input terminal of the adder operational amplifier; The first end of the first access resistor is connected to the positive power supply terminal or the negative power supply terminal, and the first end of the second access resistor is connected to the output terminal of the amplification module. The first terminals of both the grounding resistor and the feedback resistor are connected to the negative input terminal of the adder operational amplifier; The second end of the grounding resistor is connected to the ground potential, and the second end of the feedback resistor is connected to the output of the adder operational amplifier.

4. The circuit according to claim 1, characterized in that, If the first input terminal of the addition module is connected to the positive power supply terminal, the circuit further includes a positive power supply module, which is used to provide the positive power supply voltage.

5. The circuit according to claim 4, characterized in that, The positive power supply module includes: a gate driver chip, a switch group, a memory module, a first operational amplifier, a second operational amplifier, an oscillator, and a reference source; The input terminal of the gate driver chip is connected to the output terminal of the second operational amplifier, and the output terminal of the gate driver chip is connected to the control terminal of the switch group. The output terminal of the switch group is connected to the input terminal of the storage module, and the output terminal of the storage module is the positive power supply terminal of the positive power supply module. The first input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier, and the second input terminal of the second operational amplifier is connected to the oscillator; The first input terminal of the first operational amplifier is connected to the positive power supply terminal, the second input terminal of the first operational amplifier is connected to the output terminal of the reference source, and the input terminal of the reference source is connected to the output terminal of the adder module.

6. The circuit according to claim 1, characterized in that, If the first input terminal of the addition module is connected to the negative power supply terminal, the circuit further includes: an inverter; The input terminal of the inverter is connected to the output terminal of the amplification module, and the output terminal of the inverter is connected to the first input terminal of the addition module.

7. The circuit according to any one of claims 1 to 6, characterized in that, The amplification module includes: a signal operational amplifier, a feedback resistor, and a grounding resistor; The first input terminal of the signal operational amplifier is the input terminal of the amplification module and is connected to the output terminal of the high-pass filter; The second input terminal of the signal operational amplifier is connected to ground potential through the grounding resistor; The output terminal of the signal operational amplifier is the output terminal of the amplification module, and is connected to the second input terminal of the signal operational amplifier through the feedback resistor.

8. The circuit according to any one of claims 1 to 6, characterized in that, The high-pass filter includes: a filter capacitor and a filter resistor; The first terminal of the filter capacitor is the input terminal of the high-pass filter; The first terminal of the filter resistor is connected to ground potential; The second terminal of the filter capacitor and the second terminal of the filter resistor are connected to serve as the output terminal of the high-pass filter.

9. A driving circuit, characterized in that, The driving circuit includes: a light-emitting diode and a driving voltage adjustment circuit as described in any one of claims 1 to 8; The driving voltage adjustment circuit is connected to the light-emitting diode and is used to drive the light-emitting diode to emit light.

10. A display device, characterized in that, The display device includes: a display screen and the driving circuit as described in claim 9; The driving circuit is connected to the display screen and is used to drive the display screen to display images.

Images