LCD (Liquid Crystal Display) pixel driving circuit based on double-gate transistor

Abstract

The invention discloses an LCD (Liquid Crystal Display) pixel driving circuit based on a double-gate transistor, which comprises a first transistor, a pre-storage capacitor, a first double-gate transistor, a second double-gate transistor and a liquid crystal capacitor, and is characterized in that a first source drain electrode of the first transistor is coupled to a data signal line, and a gate electrode is coupled to a control signal line; the second source and drain electrode is coupled to the first grid electrode of the first bigrid transistor and one end of the pre-storage capacitor, and the second source and drain electrode is coupled to the first grid electrode of the second bigrid transistor through the control electrode; one end, far away from the second source-drain electrode of the first transistor, of the pre-storage capacitor is coupled to a second global signal line; a first source drain electrode of the first bigrid transistor is coupled to the first global signal line, a second source drain electrode is coupled to the liquid crystal capacitor through the pixel electrode, and a second grid electrode is coupled to the second global signal line; a first source drain electrode of the second bigrid transistor is coupled to the first global signal line, a second source drain electrode is coupled to the liquid crystal capacitor, and a second grid electrode is coupled to the second global signal line.

Description

Technical Field

[0001] The present invention relates to the technical field of pixel driving, and in particular to an LCD pixel driving circuit based on a double-gate transistor. Background Art

[0002] In field sequential or color sequential display technology, the backlight can be turned on only after all the liquid crystals in the screen are deflected to a stable state to avoid image confusion. Therefore, how to speed up the liquid crystal driving time and increase the backlight on time is an urgent problem to be solved in this field.

[0003] The pixel driving circuit of the LCD with traditional color sequential display technology first charges the pixel electrodes of each row in sequence within one frame, then waits for all liquid crystals to deflect to a stable position, and finally turns on the backlight. If the backlight is turned on immediately after the last row of pixels is charged without waiting for the liquid crystal to stabilize, the corresponding liquid crystals of the pixels charged later are not yet stable, which will cause differences in brightness and color above and below, and then cause a chaotic picture. Therefore, in the pixel driving circuit, the time left for the backlight to turn on within one frame is very short, making it difficult to achieve high brightness and high frequency display. At the same time, there will be high requirements for the backlight brightness specifications and lifespan, which increases the product cost.

[0004] In summary, the traditional pixel driving circuit has the problem of not being able to take into account both the light output quality and the light output brightness. Summary of the invention

[0005] In view of this, the present invention provides an LCD pixel driving circuit based on a dual-gate transistor, which solves the problem of the traditional pixel driving circuit that it cannot take both light output quality and light output brightness into consideration by improving the circuit structure.

[0006] To solve the above problems, the technical solution of the present invention is to adopt an LCD pixel driving circuit based on a double-gate transistor, including: a first transistor, a pre-storage capacitor, a first double-gate transistor, a second double-gate transistor and a liquid crystal capacitor, wherein the first source and drain of the first transistor are coupled to the data signal line, the gate is coupled to the control signal line, the second source and drain are coupled to the first gate of the first double-gate transistor and one end of the pre-storage capacitor, and at the same time, the second source and drain are coupled to the first gate of the second double-gate transistor through the control electrode; one end of the pre-storage capacitor away from the second source and drain of the first transistor is coupled to the second global signal line; the first source and drain of the first double-gate transistor are coupled to the first global signal line, the second source and drain are coupled to the liquid crystal capacitor through the pixel electrode, and the second gate is coupled to the second global signal line; the first source and drain of the second double-gate transistor are coupled to the first global signal line, the second source and drain are coupled to the liquid crystal capacitor through the pixel electrode, and the second gate is coupled to the second global signal line.

[0007] Optionally, the first double-gate transistor and the second double-gate transistor are configured as follows: the first double-gate transistor is an N-type double-gate thin-film field effect transistor, and the second double-gate transistor is a P-type double-gate thin-film field effect transistor; or the first double-gate transistor is a P-type double-gate thin-film field effect transistor, and the second double-gate transistor is an N-type double-gate thin-film field effect transistor.

[0008] Optionally, during the backlight on time, the first transistor is controlled to turn on based on a control signal, and the first transistor outputs a pre-charge voltage based on the data signal and stores it in the pre-storage capacitor until all pixels complete voltage pre-storage.

[0009] Optionally, when the first dual-gate transistor is an N-type dual-gate thin-film field-effect transistor and the second dual-gate transistor is a P-type dual-gate thin-film field-effect transistor: when the data signal of the Nth frame is at a high potential and the backlight is turned off, the first global signal jumps to a high potential and the second global signal jumps to a low potential, the second dual-gate transistor turns on and resets the pixel electrode to a high potential, after the pixel electrode is reset, the first global signal jumps to a low potential and the second global signal jumps to a high potential, the first dual-gate transistor turns on, the positive charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; when entering the N+1th frame, the backlight turns on.

[0010] Optionally, when the first dual-gate transistor is an N-type dual-gate thin-film field effect transistor and the second dual-gate transistor is a P-type dual-gate thin-film field effect transistor: when the data signal of the N+1 frame is at a low potential and the backlight is turned off, the first global signal jumps to a low potential and the second global signal jumps to a high potential, the first dual-gate transistor turns on and resets the pixel electrode to a low potential, after the pixel electrode is reset, the first global signal jumps to a high potential and the second global signal jumps to a low potential, the second dual-gate transistor turns on, the negative charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; when entering the N+2 frame, the backlight turns on.

[0011] Optionally, when the first dual-gate transistor is a P-type dual-gate thin-film field-effect transistor and the second dual-gate transistor is an N-type dual-gate thin-film field-effect transistor, when the data signal of the Nth frame is at a high potential and the backlight is turned off, the first global signal jumps to a high potential and the second global signal jumps to a low potential, the first dual-gate transistor turns on and resets the pixel electrode to a high potential, after the pixel electrode is reset, the first global signal jumps to a low potential and the second global signal jumps to a high potential, the second dual-gate transistor turns on, the positive charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; when entering the N+1th frame, the backlight turns on.

[0012] Optionally, when the first dual-gate transistor is a P-type dual-gate thin-film field-effect transistor and the second dual-gate transistor is an N-type dual-gate thin-film field-effect transistor, when the data signal of the N+1 frame is at a low potential and the backlight is turned off, the first global signal jumps to a low potential and the second global signal jumps to a high potential, the second dual-gate transistor turns on and resets the pixel electrode to a low potential, after the pixel electrode is reset, the first global signal jumps to a high potential and the second global signal jumps to a low potential, the first dual-gate transistor turns on, the negative charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; when entering the N+2 frame, the backlight turns on.

[0013] Optionally, when the LCD pixel driving circuit further includes a third global signal line, the first source and drain of the second double-gate transistor are configured to be coupled to the third global signal line.

[0014] Optionally, when the LCD pixel driving circuit further includes a third global signal line, the second gate of the second double-gate transistor is configured to be coupled to the third global signal line.

[0015] Optionally, one end of the liquid crystal capacitor away from the pixel electrode is coupled to the common electrode line. The primary improvement of the present invention is the LCD pixel driving circuit based on a dual-gate transistor. By setting a pre-storage unit, a pre-charge voltage is stored by a pre-storage capacitor during the backlight emission time of the current frame, so that all pixels synchronously read the pre-charge voltage in the next frame, which greatly reduces the writing time of the pixel voltage and relatively increases the backlight emission time, thereby increasing the light output brightness while ensuring the light output quality, thereby solving the problem of the traditional pixel driving circuit that cannot take into account both the light output quality and the light output brightness.

[0016] At the same time, the present invention sets a P-type TFT and an N-type TFT to cooperate, so that the driving circuit can realize discharge control of the reset pixel electrode based on the data signal through the potential conversion of the first global signal and the second global signal, whether the pixel electrode is reset to a high potential or a low potential through the first global signal, so that the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode. On the one hand, in this discharge working mode, the time required for the pixel electrode to form the voltage required for the liquid crystal to flip the target angle is much shorter than the traditional charging working mode; on the other hand, the potential polarity of the pixel electrode is flexibly and accurately converted in the discharge working mode, avoiding the aging and damage problems caused by the liquid crystal working in a single polarity state for a long time; on the third hand, the voltage difference between the gate and the source of the first double-gate transistor and the voltage difference between the gate and the drain of the second double-gate transistor is in a flip state in odd frames and even frames, so the first double-gate transistor and the second double-gate transistor are in the PBTS and NBTS states in the odd-coupled frames respectively, and the two effects offset each other, which can solve the problem of TFT device degradation and display life reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a simplified circuit diagram of a dual-gate transistor-based LCD pixel driving circuit of the present invention; Figure 2 It is a driving timing diagram of the LCD pixel driving circuit based on the dual-gate transistor of the present invention; Figure 3 is a simplified circuit diagram of an LCD pixel driving circuit based on a dual-gate transistor according to a preferred embodiment of the present invention; Figure 4 is a simplified circuit diagram of an LCD pixel driving circuit based on dual-gate transistors according to another preferred embodiment of the present invention. Implementation

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0021] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0023] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0026] Specifically, Figure 1 As shown, an LCD pixel driving circuit based on a dual-gate transistor includes: a first transistor M1, a pre-storage capacitor Cst, a first dual-gate transistor M2, a second dual-gate transistor M3 and a liquid crystal capacitor Clc, wherein the first source and drain of the first transistor M1 are coupled to a data signal line date (Vdate is the voltage of the data signal), the gate is coupled to a control signal line scan (Vscan is the voltage of the control signal), the second source and drain are coupled to the first gate of the first dual-gate transistor M2 and one end of the pre-storage capacitor Cst, and at the same time, the second source and drain are coupled to the first gate of the second dual-gate transistor M3 through the control electrode. a gate; one end of the pre-storage capacitor Cst away from the second source and drain of the first transistor M1 is coupled to the second global signal line st2 (Vst2 is the voltage of the second global signal); the first source and drain of the first double-gate transistor M2 is coupled to the first global signal line st1 (Vst1 is the voltage of the first global signal), the second source and drain are coupled to the liquid crystal capacitor Clc through the pixel electrode, and the second gate is coupled to the second global signal line; the first source and drain of the second double-gate transistor M3 is coupled to the first global signal line, the second source and drain are coupled to the liquid crystal capacitor Clc through the pixel electrode, and the second gate is coupled to the second global signal line. Wherein, one end of the liquid crystal capacitor Clc away from the pixel electrode is coupled to the common electrode line.

[0027] Further, the first double-gate transistor M2 and the second double-gate transistor M3 are configured as follows: the first double-gate transistor M2 is an N-type double-gate thin-film field effect transistor, and the second double-gate transistor M3 is a P-type double-gate thin-film field effect transistor; or the first double-gate transistor M2 is a P-type double-gate thin-film field effect transistor, and the second double-gate transistor M3 is an N-type double-gate thin-film field effect transistor.

[0028] Specifically, to facilitate understanding of the working timing of the pixel driving circuit, as shown in FIG. Figure 2 As shown, taking the first double-gate transistor M2 as an N-type double-gate thin-film field effect transistor and the second double-gate transistor M3 as a P-type double-gate thin-film field effect transistor as an example: During the backlight on (here defined as first-order programming / display) time of the Nth frame (here defined as an odd frame), the data signal is high, and the first transistor M1 is controlled to be turned on based on the control signal. The first transistor M1 outputs a precharge voltage based on the data signal and stores it in the pre-storage capacitor Cst until all pixels complete voltage pre-storage; when the backlight is turned off in the Nth frame, the first global signal jumps to a high potential and the second global signal jumps to a low potential. At this time, the second dual-gate transistor M3 has a positive bias in Vth due to the lower second gate potential, and the control electrode potential is coupled and pulled down by the pre-storage capacitor Cst, so the second dual-gate transistor M3 is turned on and Finally, it works in the linear region and resets the pixel electrode to a high potential. After the pixel electrode is reset, the first global signal jumps to a low potential and the second global signal jumps to a high potential. At this time, the first dual-gate transistor M2 has a negative bias in Vth due to the high potential of the second gate, and the potential of the control electrode is coupled and pulled up by the pre-storage capacitor Cst. The first dual-gate transistor M2 is turned on and finally works in the saturation region. The positive charge stored in the pixel electrode flows to the first global signal line to form a source-drain current. The magnitude of the source-drain current is determined by the voltage difference between the control electrode and the first global signal. The voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode (here it can be defined as second-order programming); When entering the N+1th frame (herein, it can be defined as an even frame), the backlight is turned on, the data signal of the N+1th frame is configured to be low potential, and the first transistor M1 outputs a pre-charge voltage based on the data signal and stores it in the pre-storage capacitor Cst until all pixels complete voltage pre-storage; when the backlight of the N+1th frame is turned off, the first global signal jumps to a low potential and the second global signal jumps to a high potential. At this time, the first dual-gate transistor M2 has a negative bias in Vth due to the increase in the second gate potential, and the control electrode potential is coupled and pulled up by the pre-storage capacitor Cst, and the first dual-gate transistor M2 is turned on. The pixel electrode is turned on and finally works in the linear region, and resets the pixel electrode to a low potential. After the pixel electrode is reset, the first global signal jumps to a high potential and the second global signal jumps to a low potential. At this time, the second dual-gate transistor M3 causes the Vth to be positively biased due to the lower second gate potential, and the control electrode potential is coupled and pulled down by the pre-storage capacitor Cst. The second dual-gate transistor M3 is turned on and finally works in the saturation region. The negative charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode. When entering the N+2th frame, the backlight is turned on.

[0029] It should be noted here that N is an odd number and a positive integer, and can be configured as 1, 3, 5, 7... in the above embodiments. At the same time, in order to fully illustrate the signal changes required for different polarity reversals of the liquid crystal, the present invention limits the frames to N and N+1. Here, it is assumed that the liquid crystal needs to perform polarity reversal in every frame, but the technical solution claimed by the present invention is also applicable to the polarity reversal of the liquid crystal every M frames, M∈(2,+∞). Therefore, the descriptions of the Nth frame, the N+1th frame, etc. used to accurately illustrate the technical solution claimed by the present invention should not be regarded as limiting the scope of protection of the present application.

[0030] It should be noted that the "high potential" and "low potential" described in the present invention refer to the potential relative to the common electrode potential. For example, when the potential is higher than Vcom, it is a high potential; when the potential is lower than Vcon, it is a low potential.

[0031] The present invention sets a pre-storage unit so that during the backlight emission time of the current frame, a pre-charge voltage is stored by a pre-storage capacitor, so that all pixels synchronously read the pre-charge voltage in the next frame, which greatly reduces the writing time of the pixel voltage and relatively increases the backlight emission time, thereby increasing the light output brightness while ensuring the light output quality, and solves the problem of the traditional pixel driving circuit that cannot take into account both the light output quality and the light output brightness.

[0032] At the same time, the inventor noticed the difficulty of polarity reversal caused by using dual-gate transistors. Therefore, the present invention sets a P-type TFT and an N-type TFT to cooperate, so that no matter whether the driving circuit resets the pixel electrode to a high potential or a low potential through the first global signal, it can realize discharge control of the reset pixel electrode based on the data signal through the potential conversion of the first global signal and the second global signal, so that the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode. On the one hand, in this discharge working mode, the time required for the pixel electrode to form the voltage required for the liquid crystal to flip the target angle is much lower than that in the traditional charging working mode; on the other hand, the polarity of the potential of the pixel electrode is flexibly and accurately changed in the discharge working mode, avoiding the aging and damage problems caused by the liquid crystal working in a single polarity state for a long time.

[0033] Furthermore, when the first dual-gate transistor M2 is a P-type dual-gate thin-film field-effect transistor and the second dual-gate transistor M3 is an N-type dual-gate thin-film field-effect transistor, when the data signal of the Nth frame is at a high potential and the backlight is turned off, the first global signal jumps to a high potential and the second global signal jumps to a low potential, the first dual-gate transistor M2 is turned on and resets the pixel electrode to a high potential, after the pixel electrode is reset, the first global signal jumps to a low potential and the second global signal jumps to a high potential, the second dual-gate transistor M3 is turned on, the positive charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; when entering the N+1th frame, the backlight is turned on. When the data signal of the N+1th frame is at a low potential and the backlight is turned off, the first global signal jumps to a low potential and the second global signal jumps to a high potential, the second dual-gate transistor M3 is turned on and resets the pixel electrode to a low potential, after the pixel electrode is reset, the first global signal jumps to a high potential and the second global signal jumps to a low potential, the first dual-gate transistor M2 is turned on, the negative charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; when entering the N+2th frame, the backlight is turned on.

[0034] Furthermore, if Figure 3 As shown, without considering the pixel aperture ratio or without affecting the pixel aperture ratio, in order to facilitate more flexible control of the reset of the pixel electrode, the LCD pixel driving circuit may further include a third global signal line st3 (Vst3 is the voltage of the third global signal), and the first source and drain of the second dual-gate transistor M3 are configured to be coupled to the third global signal line.

[0035] Furthermore, if Figure 4 As shown, when the LCD pixel driving circuit further includes a third global signal line, the second gate of the second double-gate transistor M3 may also be configured to be coupled to the third global signal line. The above is an LCD pixel driving circuit based on a dual-gate transistor provided in an embodiment of the present invention. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0036] Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention. The steps of the method or algorithm described in conjunction with the embodiments disclosed herein can be directly implemented with a software module executed by a hardware or processor, or a combination of the two. The software module can be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the technical field.

Claims

1. An LCD pixel driving circuit based on a dual-gate transistor, characterized in that: include: A first transistor (M1), a pre-storage capacitor (Cst), a first double-gate transistor (M2), a second double-gate transistor (M3) and a liquid crystal capacitor (Clc), wherein: The first source and drain of the first transistor (M1) are coupled to the data signal line, the gate is coupled to the control signal line, the second source and drain are coupled to the first gate of the first double-gate transistor (M2) and one end of the pre-storage capacitor (Cst), and the second source and drain are coupled to the first gate of the second double-gate transistor (M3) through the control electrode; One end of the pre-storage capacitor (Cst) away from the second source and drain of the first transistor (M1) is coupled to the second global signal line; The first source and drain of the first dual-gate transistor (M2) are coupled to the first global signal line, the second source and drain are coupled to the liquid crystal capacitor (Clc) through the pixel electrode, and the second gate is coupled to the second global signal line; The first source and drain of the second dual-gate transistor (M3) are coupled to the first global signal line, the second source and drain are coupled to the liquid crystal capacitor (Clc) through the pixel electrode, and the second gate is coupled to the second global signal line.

2. The LCD pixel driving circuit according to claim 1, characterized in that: The first dual-gate transistor (M2) and the second dual-gate transistor (M3) are configured as: The first double-gate transistor (M2) is an N-type double-gate thin-film field-effect transistor, and the second double-gate transistor (M3) is a P-type double-gate thin-film field-effect transistor; or The first double-gate transistor (M2) is a P-type double-gate thin-film field-effect transistor, and the second double-gate transistor (M3) is an N-type double-gate thin-film field-effect transistor.

3. The LCD pixel driving circuit according to claim 2, characterized in that: During the backlight on time, the first transistor (M1) is turned on based on a control signal, and the first transistor (M1) outputs a pre-charge voltage based on the data signal and stores it in the pre-storage capacitor (Cst) until all pixels complete voltage pre-storage.

4. The LCD pixel driving circuit according to claim 2, characterized in that: When the first double-gate transistor (M2) is an N-type double-gate thin-film field-effect transistor and the second double-gate transistor (M3) is a P-type double-gate thin-film field-effect transistor: When the data signal of the Nth frame is at a high potential and the backlight is turned off, the first global signal jumps to a high potential, the second global signal jumps to a low potential, the second dual-gate transistor (M3) is turned on and resets the pixel electrode to a high potential, After the pixel electrode is reset, the first global signal jumps to a low potential, the second global signal jumps to a high potential, the first dual-gate transistor (M2) is turned on, the positive charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; When entering the N+1th frame, the backlight is turned on.

5. The LCD pixel driving circuit according to claim 4, characterized in that: When the data signal of the N+1th frame is at a low potential and the backlight is turned off, the first global signal jumps to a low potential, the second global signal jumps to a high potential, the first dual-gate transistor (M2) is turned on and resets the pixel electrode to a low potential, After the pixel electrode is reset, the first global signal jumps to a high potential, the second global signal jumps to a low potential, the second dual-gate transistor (M3) is turned on, the negative charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; When entering the N+2th frame, the backlight is turned on.

6. The LCD pixel driving circuit according to claim 2, characterized in that: In the case where the first double-gate transistor (M2) is a P-type double-gate thin-film field-effect transistor and the second double-gate transistor (M3) is an N-type double-gate thin-film field-effect transistor, When the data signal of the Nth frame is at a high potential and the backlight is turned off, the first global signal jumps to a high potential, the second global signal jumps to a low potential, the first dual-gate transistor (M2) is turned on and resets the pixel electrode to a high potential, After the pixel electrode is reset, the first global signal jumps to a low potential, the second global signal jumps to a high potential, the second dual-gate transistor (M3) is turned on, the positive charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; When entering the N+1th frame, the backlight is turned on.

7. The LCD pixel driving circuit according to claim 6, characterized in that: When the data signal of the N+1th frame is at a low potential and the backlight is turned off, the first global signal jumps to a low potential, the second global signal jumps to a high potential, the second dual-gate transistor (M3) is turned on and resets the pixel electrode to a low potential, After the pixel electrode is reset, the first global signal jumps to a high potential, the second global signal jumps to a low potential, the first dual-gate transistor (M2) is turned on, the negative charge stored in the pixel electrode flows to the first global signal line, and the voltage required for the liquid crystal to flip the target angle is formed on the pixel electrode; When entering the N+2th frame, the backlight is turned on.

8. The LCD pixel driving circuit according to claim 1, characterized in that: When the LCD pixel driving circuit further includes a third global signal line, the first source and drain of the second dual-gate transistor (M3) are configured to be coupled to the third global signal line.

9. The LCD pixel driving circuit according to claim 1, characterized in that: When the LCD pixel driving circuit further includes a third global signal line, the second gate of the second dual-gate transistor (M3) is configured to be coupled to the third global signal line.

10. The LCD pixel driving circuit according to claim 1, characterized in that: One end of the liquid crystal capacitor (Clc) away from the pixel electrode is coupled to the common electrode line.

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