Common voltage driving circuit and liquid crystal display device

Abstract

The invention discloses a common voltage driving circuit and a liquid crystal display device, and the circuit comprises a signal generation module, a voltage amplification module, and a target power voltage generation module. The signal generation module is used for generating initial common voltage; the voltage amplification module is connected with the signal generation module and is used for amplifying the initial common voltage so as to output a target common voltage; and the target power supply voltage generation module is connected with the voltage amplification module and is used for generating and outputting target power supply voltage required for amplifying the initial common voltage to the voltage amplification module according to the target common voltage fed back by the voltage amplification module. According to the common voltage driving circuit and the liquid crystal display device, the corresponding target power supply voltage can be configured according to the target common voltage required by the driving circuit, so that the output range of the target common voltage is expanded, and the design requirement of the liquid crystal display device for the common voltage range is met.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a common voltage driving circuit and a liquid crystal display device. Background Art

[0002] In the driving system of a liquid crystal display, a common voltage driving module is usually included. Through this common voltage driving module, a positive or negative common voltage is applied to the common electrode of the liquid crystal display panel, so as to form a certain driving voltage difference between the common electrode and the pixel electrode, thereby controlling the rotation angle of liquid crystal molecules and driving the liquid crystal display panel to display colors.

[0003] In the prior art, an operational amplifier (OP) is usually used as the main component for generating the common voltage. Generally, the output voltage range of the OP on the market is small, and the voltage output range is fixed and single. With the diversification of the types and functions of display panels, the demand for the input common voltage by the display panel is also increasing. Therefore, for the driving circuit designed with only a single OP in the prior art, the output common voltage range is difficult to meet the design requirements of the liquid crystal display device.

[0004] Therefore, it is necessary to provide an improved technical solution to overcome the above technical problems existing in the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a common voltage driving circuit and a liquid crystal display device, which can expand the output range of the target common voltage and meet the design requirements of the liquid crystal display device for the common voltage range.

[0006] To achieve the above object: In a first aspect, an embodiment of this application provides a common voltage driving circuit, including a signal generation module, a voltage amplification module, and a target power supply voltage generation module; wherein, The signal generation module is used to generate an initial common voltage; The voltage amplification module is connected to the signal generation module and is used to amplify the initial common voltage to output a target common voltage; The target power supply voltage generation module is connected to the voltage amplification module and is used to generate and output a target power supply voltage adapted to amplify the initial common voltage to the voltage amplification module according to the target common voltage fed back by the voltage amplification module.

[0007] Optionally, the target common voltage includes a target common voltage in a first level state and a target common voltage in a second level state, and the target power supply voltage includes a first target power supply voltage and a second target power supply voltage.

[0008] Optionally, the target power supply voltage generation module includes a first target power supply voltage generation unit and a second target power supply voltage generation unit; The input end of the first target power supply voltage generation unit is connected to the output end of the voltage amplification module, the output end of the first target power supply voltage generation unit is connected to the first power supply input end of the voltage amplification module, and the first target power supply voltage generation unit is configured to generate the first target power supply voltage according to the target common voltage in the first level state; The input end of the second target power supply voltage generation unit is connected to the output end of the voltage amplification module, the output end of the second target power supply voltage generation unit is connected to the second power supply input end of the voltage amplification module, and the second target power supply voltage generation unit is configured to generate the second target power supply voltage according to the target common voltage in the second level state.

[0009] Optionally, the first target power supply voltage generation unit includes a first voltage dividing unit and a first voltage follower; The input end of the first voltage dividing unit is the input end of the first target power supply voltage generation unit, and the output end of the first voltage dividing unit is connected to the non-inverting input end and the inverting input end of the first voltage follower; The output end of the first voltage follower is the output end of the first target power supply voltage generation unit, the first power supply input end of the first voltage follower is connected to a first power supply, and the second power supply input end of the first voltage follower is grounded.

[0010] Optionally, the first voltage dividing unit includes a first voltage dividing resistor and a second voltage dividing resistor; The first end of the first voltage dividing resistor is connected to the first power supply; The second end of the first voltage dividing resistor and the first end of the second voltage dividing resistor are connected together as the output end of the first voltage dividing unit; The second end of the second voltage dividing resistor is the input end of the first voltage dividing unit.

[0011] Optionally, the second target power supply voltage generation unit includes a second voltage dividing unit and a second voltage follower; The input end of the second voltage dividing unit is the input end of the second target power supply voltage generation unit, and the output end of the second voltage dividing unit is connected to the non-inverting input end and the inverting input end of the second voltage follower; The output end of the second voltage follower is the output end of the second target power supply voltage generation unit, the first power supply input end of the second voltage follower is grounded, and the second power supply input end of the second voltage follower is connected to a second power supply.

[0012] Optionally, the second voltage dividing unit includes a third voltage dividing resistor and a fourth voltage dividing resistor; The first end of the third voltage dividing resistor is the input end of the second voltage dividing unit; The second end of the third voltage dividing resistor and the first end of the fourth voltage dividing resistor are connected together as the output end of the second voltage dividing unit; The second end of the fourth voltage dividing resistor is connected to the second power supply.

[0013] Optionally, the resistance values of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor, and the fourth voltage dividing resistor are equal.

[0014] Optionally, the voltage amplification module includes a voltage amplifier, a fifth resistor, and a sixth resistor; The non-inverting input terminal of the voltage amplifier is connected to the output terminal of the signal generation module for receiving the initial common voltage; The inverting input terminal of the voltage amplifier is grounded through the fifth resistor; The output terminal of the voltage amplifier is the output terminal of the voltage amplification module; The first end of the sixth resistor is connected to the inverting input terminal of the voltage amplifier, and the second end of the sixth resistor is connected to the output terminal of the voltage amplifier.

[0015] In a second aspect, an embodiment of the present application provides a liquid crystal display device including the common voltage driving circuit described above.

[0016] The common voltage driving circuit and the liquid crystal display device provided by the embodiments of the present application generate an initial common voltage through a signal generation module; amplify the initial common voltage through a voltage amplification module to output a target common voltage; and generate and output a target power supply voltage adapted to amplify the initial common voltage to the voltage amplification module according to the target common voltage fed back by the voltage amplification module through a target power supply voltage generation module. In this way, a corresponding target power supply voltage can be configured according to the target common voltage required by the driving circuit, thereby expanding the output range of the target common voltage to meet the design requirements of the liquid crystal display device for the common voltage range. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1It is a structural block diagram of a common voltage driving circuit provided by an embodiment of the present application.

[0019] Figure 2 It is a schematic circuit connection diagram of a common voltage driving circuit provided by an embodiment of the present application.

[0020] Figure 3 It is a working timing diagram of a common voltage driving circuit provided by an embodiment of the present application. Detailed implementation manners

[0021] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0022] It should be noted that in this document, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including that element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanations in the specific embodiments or further in combination with the context of the specific embodiments.

[0023] It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this document, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining". Furthermore, as used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context indicates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the described features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" as used herein are interpreted as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". An exception to this definition only occurs when the combination of elements, functions, steps or operations are mutually exclusive in some way.

[0024] It should be understood that the specific embodiments described herein are merely for explaining the present application and are not used to limit the present application.

[0025] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of explaining the present application and have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used interchangeably.

[0026] Figure 1 This is the structural block diagram of the common voltage driving circuit provided for the embodiments of the present application. As Figure 1 shown, the common voltage driving circuit provided for the embodiments of the present application includes a signal generation module 110, a voltage amplification module 120 and a target power supply voltage generation module 130.

[0027] Among them, the signal generation module 110 is used to generate an initial common voltage ACVCOM1; the voltage amplification module 120 is connected to the signal generation module 110 and is used to amplify the initial common voltage ACVCOM1 to output a target common voltage ACVCOM2; the target power supply voltage generation module 130 is connected to the voltage amplification module 120 and is used to generate and output a target power supply voltage adapted to amplify the initial common voltage ACVCOM1 to the voltage amplification module 120 according to the target common voltage ACVCOM2 fed back by the voltage amplification module 120.

[0028] In an embodiment of the present application, the signal generation module 110 includes a microcontroller unit 111 (MCU) and a digital-to-analog converter 112 (DAC). Specifically, when powering on the common electrode of the liquid crystal display device, the MCU reads the digital common voltage from the storage unit and sends the digital common voltage to the DAC. The DAC converts the digital common voltage into an analog common voltage, that is, the initial common voltage ACVCOM1, and then outputs the initial common voltage ACVCOM1 to the voltage amplification module 120 for amplification to generate the target common voltage ACVCOM2.

[0029] In an embodiment of the present application, the target common voltage ACVCOM2 includes the target common voltage ACVCOM2 in the first level state and the target common voltage ACVCOM2 in the second level state; the target power supply voltage includes the first target power supply voltage and the second target power supply voltage. Specifically, when the first level state is a positive voltage state, the first target power supply voltage can be greater than or equal to the target common voltage ACVCOM2 in the first level state; when the second level state is a negative voltage state, the second target power supply voltage can be less than or equal to the target common voltage ACVCOM2 in the second level state.

[0030] In an embodiment of the present application, the target power supply voltage generation module 130 includes a first target power supply voltage generation unit 131 and a second target power supply voltage generation unit 132. Specifically, the input end of the first target power supply voltage generation unit 131 is connected to the output end of the voltage amplification module 120, and the output end of the first target power supply voltage generation unit 131 is connected to the first power input end of the voltage amplification module 120. The first target power supply voltage generation unit 131 is used to generate the first target power supply voltage according to the target common voltage ACVCOM2 in the first level state. The input end of the second target power supply voltage generation unit 132 is connected to the output end of the voltage amplification module 120, and the output end of the second target power supply voltage generation unit 132 is connected to the second power input end of the voltage amplification module 120. The second target power supply voltage generation unit 132 is used to generate the second target power supply voltage according to the target common voltage ACVCOM2 in the second level state.

[0031] In a specific embodiment, both the target common voltage ACVCOM2 and the initial common voltage ACVCOM1 are square wave signals having a positive voltage state and a negative voltage state. When the voltage amplification module 120 outputs the target common voltage ACVCOM2 in the positive voltage state, the first target power supply voltage generation unit 131 provides the corresponding positive power supply voltage for the voltage amplification module 120. When the voltage amplification module 120 outputs the target common voltage ACVCOM2 in the negative voltage state, the second target power supply voltage generation unit 132 provides the corresponding negative power supply voltage for the voltage amplification module 120. When the voltage range of the target common voltage ACVCOM2 output by the voltage amplification module 120 changes, the target power supply voltage generation module 130 can output the target power supply voltage required for the changed target common voltage ACVCOM2 according to the target common voltage ACVCOM2 after the positive and negative voltage values are changed. Thus, through the target power supply voltage generation module 130, different ranges of target power supply voltages required by the voltage amplification module 120 can be generated according to different target common voltages ACVCOM2, so as to meet the voltage design requirements of various display panels.

[0032] Figure 2 FIG. is a schematic circuit connection diagram of the common voltage driving circuit provided by the embodiment of the present application. As Figure 2 shown, the first target power supply voltage generation unit 131 in this embodiment includes a first voltage dividing unit 1311 and a first voltage follower OP1; the second target power supply voltage generation unit 132 includes a second voltage dividing unit 1321 and a second voltage follower OP2.

[0033] Specifically, the input end of the first voltage dividing unit 1311 is the input end of the first target power supply voltage generation unit 131. The output end VCCIN of the first voltage dividing unit 1311 is connected to the non-inverting input end and the inverting input end of the first voltage follower OP1. The output end of the first voltage follower OP1 is the output end of the first target power supply voltage generation unit 131. The first power supply input end of the first voltage follower OP1 is connected to the first power supply, and the second power supply input end of the first voltage follower OP1 is grounded.

[0034] Among them, the first voltage dividing unit 1311 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2. The first end of the first voltage dividing resistor R1 is connected to the first power supply; the second end of the first voltage dividing resistor R1 and the first end of the second voltage dividing resistor R2 are connected together as the output end VCCIN of the first voltage dividing unit 1311; the second end of the second voltage dividing resistor R2 is the input end of the first voltage dividing unit 1311.

[0035] In this embodiment, the first target power supply voltage generation unit 131 is configured to generate a target power supply voltage within the positive voltage range. Therefore, the first power supply input terminal of the first voltage follower OP1, that is, the first power supply connected to the positive power supply input terminal of the first voltage follower OP1, is the positive power supply VS+, which provides a positive voltage for the first voltage follower OP1.

[0036] Specifically, the input terminal of the second voltage dividing unit 1321 is the input terminal of the second target power supply voltage generation unit 132. The output terminal VSSIN of the second voltage dividing unit 1321 is connected to the non-inverting input terminal and the inverting input terminal of the second voltage follower OP2. The output terminal of the second voltage follower OP2 is the output terminal of the second target power supply voltage generation unit 132. The first power supply input terminal of the second voltage follower OP2 is grounded, and the second power supply input terminal of the second voltage follower OP2 is connected to the second power supply.

[0037] Among them, the second voltage dividing unit 1321 includes a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4. The first end of the third voltage dividing resistor R3 is the input terminal of the second voltage dividing unit 1321; the second end of the third voltage dividing resistor R3 and the first end of the fourth voltage dividing resistor R4 are connected together as the output terminal VSSIN of the second voltage dividing unit 1321; the second end of the fourth voltage dividing resistor R4 is connected to the second power supply.

[0038] In this embodiment, the second target power supply voltage generation unit 132 is configured to generate a target power supply voltage within the negative voltage range. Therefore, the second power supply input terminal of the second voltage follower OP2, that is, the second power supply connected to the negative power supply input terminal of the second voltage follower OP2, is the negative power supply VS-, which provides a negative voltage for the second voltage follower OP2.

[0039] In this embodiment, the first voltage follower OP1 and the second voltage follower OP2 utilize the virtual short characteristic of the operational amplifier, that is, by short-circuiting the non-inverting input terminal and the inverting input terminal, the voltage difference between the non-inverting input terminal and the inverting input terminal approaches zero, so that the output voltage of the operational amplifier is equal to the input voltage, thereby realizing the function of voltage following. When the output voltage of the operational amplifier closely follows the input voltage, it has a unity gain, that is, the gains of both the first voltage follower OP1 and the second voltage follower OP2 are 1 (no amplification).

[0040] Specifically, the voltage amplification module 120 includes a voltage amplifier OP3, a fifth resistor R5, and a sixth resistor R6. The non-inverting input terminal of the voltage amplifier OP3 is connected to the output terminal of the signal generation module 110 for receiving the initial common voltage ACVCOM1; the inverting input terminal of the voltage amplifier OP3 is grounded through the fifth resistor R5; the output terminal of the voltage amplifier OP3 is the output terminal of the voltage amplification module 120. The first terminal of the sixth resistor R6 is connected to the inverting input terminal of the voltage amplifier OP3, and the second terminal of the sixth resistor R6 is connected to the output terminal of the voltage amplifier OP3.

[0041] In this embodiment, an operational amplifier is used as the voltage amplifier, the fifth resistor R5 is used as the input resistor, and the sixth resistor R6 is used as the feedback resistor. Therefore, the gain of the voltage amplification module 120 is determined by the ratio of the feedback resistor to the input resistor, that is, the gain A = 1 + R6 / R5. By adjusting the resistance values of the sixth resistor R6 and / or the fifth resistor R5, the amplification factor of the voltage amplifier OP3 can be set, thereby changing the voltage range of the output target common voltage ACVCOM2.

[0042] Figure 3 FIG. is the timing diagram of the common voltage driving circuit provided by the embodiment of the present application; the following will be combined with Figure 3 For Figure 2 The working process of the common voltage driving circuit exemplified in is described in detail.

[0043] In this embodiment, the resistance values of the first voltage dividing resistor R1, the second voltage dividing resistor R2, the third voltage dividing resistor R3, and the fourth voltage dividing resistor R4 are equal.

[0044] Exemplarily, assuming that the initial common voltage ACVCOM1 is a square wave signal of ±3V, and the amplification factor of the voltage amplifier OP3 is 10 times, then the target common voltage ACVCOM2 is a square wave signal of ±30V; the first power supply voltage is +30V, and the second power supply voltage is -30V.

[0045] When the in-phase input terminal of the voltage amplifier OP3 inputs the initial common voltage ACVCOM1 of +3V, the voltage at the in-phase input terminal of the voltage amplifier OP3 is greater than the voltage at the anti-phase input terminal. Then, the target common voltage ACVCOM2 output by the output terminal of the voltage amplifier OP3 is +30V. After being divided by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, the voltage at the output terminal VCCIN of the first voltage-dividing unit 1311 is also +30V. Since the gain of the first voltage follower OP1 in this example is 1, the voltage at the output terminal of the first voltage follower OP1 is +30V, that is, the first target power supply voltage V+ connected to the positive power supply input terminal of the voltage amplifier OP3 is +30V. At this time, after being divided by the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4, the voltage at the output terminal VSSIN of the second voltage-dividing unit 1321 is 0V. Since the gain of the second voltage follower OP2 in this example is 1, the voltage at the output terminal of the second voltage follower OP2 is 0V.

[0046] When the anti-phase input terminal of the voltage amplifier OP3 inputs the initial common voltage ACVCOM1 of -3V, the voltage at the in-phase input terminal of the voltage amplifier OP3 is less than the voltage at the anti-phase input terminal. At this time, the target common voltage ACVCOM2 output by the output terminal of the voltage amplifier OP3 is -30V. After being divided by the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4, the voltage at the output terminal VSSIN of the second voltage-dividing unit 1321 is -30V. Then, the voltage at the output terminal of the second voltage follower OP2 is -30V, that is, the second target power supply voltage V- connected to the negative power supply input terminal of the voltage amplifier OP3 is -30V. At this time, after being divided by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, the voltage at the output terminal VCCIN of the first voltage-dividing unit 1311 is 0V. Then, the voltage at the output terminal of the first voltage follower OP1 is 0V.

[0047] In this example, the waveform of the first target power supply voltage generated by the first target power supply voltage generating unit 131 is a square wave of 0 to +30V, and the waveform of the second target power supply voltage generated by the second target power supply voltage generating unit 132 is a square wave of -30 to 0V. Therefore, by cascading the first voltage follower OP1 and the second voltage follower OP2 with the voltage amplifier OP3, the output voltage range of a single voltage amplifier OP3 can be expanded. For example, the output voltage range of the voltage amplifier OP3 can be expanded from 0 to +30V to -30V to +30V.

[0048] Similarly, assume that the target common voltage ACVCOM2 in this example is a square wave signal of ±10V. After being divided by the first voltage dividing unit 1311, the first target power supply voltage provided by the first voltage follower OP1 for the positive power supply input terminal of the voltage amplifier OP3 is +20V; after being divided by the second voltage dividing unit 1321, the second target power supply voltage provided by the second voltage follower OP2 for the negative power supply input terminal of the voltage amplifier OP3 is -20V. Therefore, through the cascading of the first voltage follower OP1 and the second voltage follower OP2 with the voltage amplifier OP3, the corresponding target power supply voltage can also be adaptively configured according to the target common voltage, thereby optimizing the energy loss of the driving circuit.

[0049] As can be seen from the above, the common voltage driving circuit provided by the embodiment of the present application can generate target power supply voltages in different ranges according to different target common voltages through the target power supply voltage generation module, so as to meet the voltage design requirements of various display panels.

[0050] Based on the same inventive concept as the foregoing embodiments, the embodiment of the present invention further provides a liquid crystal display device, and the liquid crystal display device includes the common voltage driving circuit as described in the above embodiments.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0052] In this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

[0053] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A common voltage driving circuit, characterized in that, It includes a signal generation module, a voltage amplification module, and a target power supply voltage generation module; among them, the signal generation module is used to generate an initial common voltage; the voltage amplification module is connected to the signal generation module and is used to amplify the initial common voltage to output a target common voltage; the target power supply voltage generation module is connected to the voltage amplification module and is used to generate and output a target power supply voltage adapted to amplify the initial common voltage to the voltage amplification module according to the target common voltage fed back by the voltage amplification module.

2. The common voltage driving circuit according to claim 1, wherein The target common voltage includes a target common voltage in a first level state and a target common voltage in a second level state, and the target power supply voltage includes a first target power supply voltage and a second target power supply voltage.

3. The common voltage driving circuit according to claim 2, wherein The target power supply voltage generation module includes a first target power supply voltage generation unit and a second target power supply voltage generation unit; The input end of the first target power supply voltage generation unit is connected to the output end of the voltage amplification module, and the output end of the first target power supply voltage generation unit is connected to the first power input end of the voltage amplification module. The first target power supply voltage generation unit is used to generate the first target power supply voltage according to the target common voltage in the first level state; The input end of the second target power supply voltage generation unit is connected to the output end of the voltage amplification module, and the output end of the second target power supply voltage generation unit is connected to the second power input end of the voltage amplification module. The second target power supply voltage generation unit is used to generate the second target power supply voltage according to the target common voltage in the second level state.

4. The common voltage driving circuit according to claim 3, wherein The first target power supply voltage generation unit includes a first voltage division unit and a first voltage follower; The input end of the first voltage division unit is the input end of the first target power supply voltage generation unit, and the output end of the first voltage division unit is connected to the non-inverting input end and the inverting input end of the first voltage follower; The output end of the first voltage follower is the output end of the first target power supply voltage generation unit. The first power input end of the first voltage follower is connected to a first power supply, and the second power input end of the first voltage follower is grounded.

5. The common voltage driving circuit according to claim 4, characterized in that, The first voltage division unit includes a first voltage division resistor and a second voltage division resistor; The first end of the first voltage division resistor is connected to the first power supply; The second end of the first voltage division resistor and the first end of the second voltage division resistor are connected together as the output end of the first voltage division unit; The second end of the second voltage division resistor is the input end of the first voltage division unit.

6. The common voltage driving circuit according to claim 5, characterized in that, The second target power supply voltage generation unit includes a second voltage division unit and a second voltage follower; The input end of the second voltage division unit is the input end of the second target power supply voltage generation unit, and the output end of the second voltage division unit is connected to the non-inverting input end and the inverting input end of the second voltage follower; The output end of the second voltage follower is the output end of the second target power supply voltage generation unit. The first power input end of the second voltage follower is grounded, and the second power input end of the second voltage follower is connected to a second power supply.

7. The common voltage driving circuit according to claim 6, wherein The second voltage dividing unit includes a third voltage dividing resistor and a fourth voltage dividing resistor; The first end of the third voltage dividing resistor is the input end of the second voltage dividing unit; The second end of the third voltage dividing resistor and the first end of the fourth voltage dividing resistor are connected together as the output end of the second voltage dividing unit; The second end of the fourth voltage dividing resistor is connected to the second power supply.

8. The common voltage driving circuit according to claim 7, wherein The resistance values of the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor, and the fourth voltage dividing resistor are equal.

9. The common voltage driving circuit according to claim 1, wherein The voltage amplification module includes a voltage amplifier, a fifth resistor, and a sixth resistor; The non-inverting input end of the voltage amplifier is connected to the output end of the signal generation module for receiving the initial common voltage; The inverting input end of the voltage amplifier is grounded through the fifth resistor; The output end of the voltage amplifier is the output end of the voltage amplification module; The first end of the sixth resistor is connected to the inverting input end of the voltage amplifier, and the second end of the sixth resistor is connected to the output end of the voltage amplifier.

10. A liquid crystal display device, characterized in that, It includes the common voltage driving circuit according to any one of claims 1 to 9.

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