Pixel driving circuit, driving method and display equipment

Abstract

According to the pixel driving circuit, the driving method and the display device, a grid electrode of a first compensation transistor is used for inputting a first voltage, a first end of the first compensation transistor and a first end of a first driving transistor are connected with a first power supply, and a grid electrode of the first driving transistor is used for inputting a second voltage; the second end of the first compensation transistor is connected with the second end of the first driving transistor, the anode of the first light-emitting diode and one end of the first voltage division unit, the other end of the first voltage division unit is connected with the grounding end, and the threshold voltage of the first driving transistor is the same as that of the first compensation transistor; when the first compensation transistor is switched on, the threshold voltage of the first compensation transistor is reduced for the voltage of the second end of the first driving transistor so as to compensate the voltage of the anode of the first light-emitting diode, and the brightness of the first light-emitting diode is in positive correlation with the voltage of the anode of the first light-emitting diode. The problem that the brightness of the light-emitting diodes of the display device is not uniform is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a pixel driving circuit, a driving method and a display device. BACKGROUND

[0002] At present, the luminous brightness of the light emitting diode of the display device is related to the voltage accepted by the light emitting diode, the higher the voltage accepted by the light emitting diode, the higher the brightness, the driving thin film transistor of the display device transmits the voltage to the light emitting diode, due to the threshold voltage drift of the driving thin film transistor, the voltage accepted by the light emitting diode fluctuates, and the brightness of the display device is uneven. SUMMARY

[0003] The purpose of the present application is to provide a pixel driving circuit, a driving method and a display device, which improve the problem of uneven brightness of the light emitting diode of the display device.

[0004] In order to achieve the purpose of the present application, the present application provides the following technical scheme: In a first aspect, the present application provides a pixel driving circuit, which comprises a first light emitting diode, a first compensation transistor, a first driving transistor and a first voltage dividing unit, the gate of the first compensation transistor is used for inputting a first voltage, the first end of the first compensation transistor is used for connecting with a first power supply, the first end of the first driving transistor is connected with the first power supply, the gate of the first driving transistor is used for inputting a second voltage, the second end of the first compensation transistor is connected with the second end of the first driving transistor, the anode of the first light emitting diode and one end of the first voltage dividing unit, the other end of the first voltage dividing unit is connected with a ground end, the cathode of the first light emitting diode is connected with the ground end, the first voltage is less than the threshold voltage of the first compensation transistor, the first driving transistor is used for transmitting voltage to the anode of the first light emitting diode when it is turned on, the threshold voltage of the first driving transistor is the same as the threshold voltage of the first compensation transistor, the first compensation transistor is used for reducing the threshold voltage of the first compensation transistor to the voltage of the second end of the first driving transistor when it is turned on, so as to compensate the voltage of the anode of the first light emitting diode, and the brightness of the first light emitting diode is positively correlated with the voltage of the anode of the first light emitting diode.

[0005] It can be understood that by setting the first compensation transistor to cooperate with the first driving transistor, the threshold voltage of the first compensation transistor is the same as that of the first driving transistor. The first driving transistor is used to transmit voltage to the anode of the first light-emitting diode when it is turned on. The gate of the first compensation transistor is used to input a first voltage, which is less than the threshold voltage of the first compensation transistor. The first compensation transistor is used to reduce the voltage at the second terminal of the first driving transistor by the threshold voltage of the first compensation transistor when it is turned on. Since the threshold voltages of the two are the same, the compensation amount exactly offsets the voltage loss caused by the threshold voltage of the first driving transistor, so that the anode voltage of the first light-emitting diode always remains stable. Since the brightness of the first light-emitting diode is positively correlated with the anode voltage of the first light-emitting diode, the stability of the brightness of the first light-emitting diode is achieved, and the uneven brightness caused by threshold voltage drift is solved.

[0006] In one possible example, the pixel driving circuit further includes a second compensation transistor, the second terminal of which is connected to the gate of the first compensation transistor. The gate of the second compensation transistor is used to input a first signal, the first terminal of the second compensation transistor is used to input the first voltage, and the second terminal of the second compensation transistor is used to transmit the first voltage to the gate of the first compensation transistor when it is turned on.

[0007] It is understood that the gate of the second compensation transistor is controlled by the first signal. The first terminal of the second compensation transistor is connected to the first voltage, and the second terminal is connected to the gate of the first compensation transistor. When voltage compensation is required, the first signal triggers the second compensation transistor to conduct, and the first voltage is accurately transmitted to the gate of the first compensation transistor through its second terminal, ensuring that the first compensation transistor starts the compensation function at the appropriate time. When compensation is not required, the first signal turns off the second compensation transistor, cutting off the transmission path of the first voltage and preventing malfunction of the first compensation transistor. This controllable voltage transmission mechanism improves the accuracy of the compensation process and makes the gate voltage supply of the first compensation transistor more flexible, allowing the compensation timing to be dynamically adjusted according to the working cycle of the pixel driving circuit.

[0008] In one possible example, the pixel driving circuit further includes a compensation capacitor, one end of which is connected to the second end of the first compensation transistor and one end of the first voltage divider unit, and the other end of which is connected to the anode of the first light-emitting diode and the second end of the first driving transistor.

[0009] It is understood that one end of the compensation capacitor is connected to the second end of the first compensation transistor and one end of the first voltage divider unit, while the other end of the compensation capacitor is connected to the anode of the first light-emitting diode and the second end of the first driving transistor. The compensation capacitor has the characteristics of energy storage and voltage stabilization. When the node voltage rises due to instantaneous load changes, the compensation capacitor charges and stores excess energy. When the node voltage drops due to the state switching of the first compensation transistor or the first driving transistor, the compensation capacitor discharges and releases energy to compensate for voltage loss, thereby alleviating the fluctuation of node voltage. Moreover, the compensation capacitor enhances the anti-interference capability of the pixel driving circuit, reduces the impact of external noise or internal signal mutations on the anode voltage of the first light-emitting diode, and ensures that its brightness remains uniform and stable by stabilizing the voltage of the first light-emitting diode, avoiding display distortion caused by voltage fluctuations, making the compensation effect of the first compensation transistor more stable, avoiding voltage surges during the compensation process, and ensuring the display stability of the first light-emitting diode.

[0010] In one possible example, the pixel driving circuit further includes a first transistor, a second transistor, and a third transistor. The gates of the first transistor and the second transistor are both used to input a second signal. The first terminals of the first transistor and the second transistor are both used to input a second voltage. The second terminal of the first transistor is connected to the second terminal of the third transistor, the gate of the first driving transistor, the first power supply, and the first terminal of the first driving transistor. The second terminal of the second transistor is connected to the second terminal of the first driving transistor, the anode of the first light-emitting diode, and the other end of the compensation capacitor. The gate of the third transistor is used to input a third signal, and the first terminal of the third transistor is used to input a third voltage. The first transistor is used to reset the voltage of the gate of the first driving transistor when it is turned on, and the second transistor is used to reset the voltage of the anode of the first light-emitting diode when it is turned on.

[0011] It is understandable that when the circuit enters the reset phase, the second signal triggers the first and second transistors to conduct. The first transistor transmits the second voltage to the gate of the first driving transistor, resetting its gate voltage to its initial state and eliminating the influence of residual voltage on the subsequent driving process. The second transistor transmits the second voltage to the anode of the first light-emitting diode, resetting its voltage and ensuring accurate brightness control in the next cycle. This reset mechanism thoroughly clears residual voltage from the circuit, ensuring a consistent starting state for each working cycle and improving the accuracy of voltage control. Simultaneously, the resetting effect of the first transistor on the gate of the driving transistor ensures the stability of the threshold voltage compensation reference of the first driving transistor, and the resetting effect of the second transistor on the anode of the first light-emitting diode guarantees the accuracy of brightness control and the stability of light emission from the first light-emitting diode.

[0012] In one possible example, the pixel driving circuit further includes a first capacitor, one end of which is connected to the second terminal of the first transistor, the second terminal of the third transistor, and the gate of the first driving transistor, and the other end of which is connected to the first terminal of the first driving transistor and the first power supply.

[0013] It can be understood that one end of the first capacitor is connected to the second terminal of the first transistor, the second terminal of the third transistor, and the gate of the first driving transistor, while the other end of the first capacitor is connected to the first terminal of the first driving transistor and the first power supply. The coupling characteristics of the first capacitor keep the voltage difference between the gate and the first terminal of the first driving transistor relatively stable. When the voltage of the first power supply fluctuates slightly or the gate voltage of the first driving transistor changes due to external signals, the first capacitor regulates the voltage across its terminals through charging and discharging to suppress sudden changes in the gate voltage. Simultaneously, the first capacitor provides stable voltage support to the gate at the instant the first driving transistor is turned on, ensuring it quickly enters a stable conduction state and reducing conduction delay. By stabilizing the gate voltage of the first driving transistor, the voltage transmitted to the anode of the first light-emitting diode is made more precise.

[0014] In one possible example, the current of the first light-emitting diode is I, the third voltage is U1, the first voltage is U2, and the first coefficient of the first light-emitting diode is k, satisfying: I = k × (U1 - U2). 2 .

[0015] It can be understood that this formula establishes a quantitative relationship between the current of the first light-emitting diode and the key control voltage. Through this quantitative relationship, the required values ​​of U1 and U2 can be calculated in reverse based on the required brightness of the first light-emitting diode (the brightness of the first light-emitting diode is positively correlated with the current). Then, the third voltage and the first voltage can be precisely controlled by the timing controller to achieve precise control of the brightness of the first light-emitting diode.

[0016] In one possible example, the pixel driving circuit further includes a second light-emitting diode and a second driving transistor. The gate of the second driving transistor is connected to the second voltage, the first power supply, and a first terminal of the second driving transistor. The second terminal of the second driving transistor is connected to the second terminal of the first compensation transistor, the anode of the second light-emitting diode, and a terminal of the first voltage divider unit. The cathode of the second light-emitting diode is connected to the ground terminal. The second driving transistor is used to transmit voltage to the anode of the second light-emitting diode when it is turned on. The threshold voltage of the second driving transistor is the same as the threshold voltage of the first compensation transistor. The first compensation transistor is used to compensate the threshold voltage of the first compensation transistor at the second terminal of the second driving transistor when it is turned on, so as to compensate the voltage of the anode of the second light-emitting diode. The brightness of the second light-emitting diode is positively correlated with the voltage of the anode of the second light-emitting diode.

[0017] It is understood that the gate of the second driving transistor is connected to a second voltage, the first terminal of the second driving transistor is connected to a first power supply, and the second terminal of the second driving transistor is connected to the second terminal of the first compensation transistor, the anode of the second light-emitting diode, and one end of the first voltage divider unit. Since the threshold voltage of the second driving transistor is the same as that of the first compensation transistor, it can share the compensation function of the first compensation transistor with the first driving transistor. After the first compensation transistor is turned on, the compensation voltage output from the second terminal of the first compensation transistor can simultaneously offset the threshold voltage loss of the two driving transistors. This shared compensation mechanism eliminates the need for an additional compensation transistor for the second light-emitting diode, reducing the number of compensation transistors, significantly simplifying the circuit structure, and lowering hardware costs and circuit integration difficulty. At the same time, since the two driving transistors share the first compensation transistor, their compensation effect is highly consistent, ensuring the stability of the anode voltage of the first and second light-emitting diodes, satisfying the compensation needs of multiple light-emitting diodes while maintaining circuit simplicity.

[0018] In one possible example, the pixel driving circuit further includes a third capacitor, one end of which is connected to the second terminal of the first compensation transistor and one end of the first voltage divider unit, and the other end of which is connected to the anode of the second light-emitting diode and the second terminal of the second driving transistor.

[0019] It is understood that one end of the third capacitor is connected to the second terminal of the first compensation transistor and one end of the first voltage divider unit, while the other end of the third capacitor is connected to the anode of the second light-emitting diode and the second terminal of the second driving transistor. The third capacitor utilizes its energy storage and voltage regulation characteristics to suppress voltage fluctuations at the node of the second light-emitting diode: when the node voltage rises, the third capacitor charges; when the voltage drops, the third capacitor discharges to replenish energy, ensuring node voltage stability. Moreover, the third capacitor and the compensation capacitor work synergistically to stabilize the voltage of the anodes of the two light-emitting diodes, avoiding voltage interference between the two light-emitting diodes. In addition, the third capacitor also enhances the stability of the second driving transistor's operation and reduces voltage surges to the second light-emitting diode during its switching process.

[0020] Secondly, embodiments of this application provide a driving method applied to a pixel driving circuit as described in the first aspect or any embodiment of the first aspect. The pixel driving circuit includes a first light-emitting diode, a first compensation transistor, a first driving transistor, and a first voltage divider unit. The gate of the first compensation transistor is used to input a first voltage. A first terminal of the first compensation transistor is connected to a first power supply. A first terminal of the first driving transistor is connected to the first power supply. The gate of the first driving transistor is used to input a second voltage. A second terminal of the first compensation transistor is connected to a second terminal of the first driving transistor, the anode of the first light-emitting diode, and one terminal of the first voltage divider unit. The other terminal of the first voltage divider unit is connected to a ground terminal. The cathode of the first light-emitting diode is connected to the ground terminal. The method includes: When the first driving transistor is turned on, it transmits voltage to the anode of the first light-emitting diode. The threshold voltage of the first driving transistor is the same as the threshold voltage of the first compensation transistor. When the first compensation transistor is turned on, it reduces the threshold voltage of the first compensation transistor by reducing the voltage at the second terminal of the first driving transistor, thereby compensating for the voltage at the anode of the first light-emitting diode. The brightness of the first light-emitting diode is positively correlated with the voltage at the anode of the first light-emitting diode.

[0021] Thirdly, according to an embodiment of this application, a display device includes a timing controller and a pixel driving circuit as described in the first aspect or any embodiment of the first aspect. The timing controller is electrically connected to the pixel driving circuit and is used to transmit a first signal, a second signal, and a third signal of the pixel driving circuit to the pixel driving circuit. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram illustrating an application scenario of a driving method according to one embodiment. Figure 2 This is a schematic diagram of the first structure of a pixel driving circuit according to one embodiment; Figure 3 This is a schematic diagram of the second structure of a pixel driving circuit according to one embodiment; Figure 4 This is a flowchart illustrating a driving method of one embodiment; Figure 5 This is a schematic diagram of the structure of a display device according to one embodiment; Figure 6 This is a schematic diagram of a timing controller signal according to one embodiment.

[0024] Explanation of reference numerals in the attached figures: 101-User, 102-Display device, 103-Server, 201-First light-emitting diode, 202-First compensation transistor, 203-First driving transistor, 204-First voltage divider unit, 205-First power supply, 206-Ground terminal, 207-Second compensation transistor, 208-Compensation capacitor, 209-First transistor, 210-Second transistor, 211-Third transistor, 212-First capacitor, 213-Second light-emitting diode, 214-Second driving transistor, 215-Third capacitor, 501-Timing controller, 502-Pixel driving circuit, 503-Processor, 504-Memory, 505-Program. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0027] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0028] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0030] The terms “1” and “2”, etc., in this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of a driving method provided in an embodiment of this application. For example... Figure 1As shown in the diagram, this application scenario includes a user 101, a display device 102, and a server 103. Optionally, the display device 102 may be a thin-film transistor liquid crystal display (TFT-LCD), and this application does not limit the structure of the display device 102. Optionally, one user 101 may use multiple display devices 102. Optionally, one user 101 may use multiple servers 103. Optionally, multiple display devices 102 may transmit data with one server 103.

[0033] Optionally, server 103 can be a standalone server or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDN), and big data and artificial intelligence platforms. Server 103 can also be implemented through a server cluster composed of multiple sub-servers. Display device 102, such as a computer, may have an operating system including but not limited to Linux, Unix, and Windows series systems (such as Windows XP, Windows 7, etc.).

[0034] It should be noted that, Figure 1 The number and form of each device in the system shown are for illustrative purposes only and do not constitute a limitation on the embodiments of this application.

[0035] The following describes the noise reduction method provided in the embodiments of this application. This driving method can be executed by the display device 102, which can be implemented by software and / or hardware, and can generally be integrated into the display device 102 or the server 103.

[0036] Please refer to Figure 2 , Figure 2This is a schematic diagram of a first structure of a pixel driving circuit provided in an embodiment of this application. The pixel driving circuit includes a first light-emitting diode 201, a first compensation transistor 202, a first driving transistor 203, and a first voltage divider unit 204. The gate of the first compensation transistor 202 is used to input a first voltage, and the first terminal of the first compensation transistor 202 is used to connect to a first power supply 205. The first terminal of the first driving transistor 203 is connected to the first power supply 205, and the gate of the first driving transistor 203 is used to input a second voltage. The second terminal of the first compensation transistor 202 is connected to the second terminal of the first driving transistor 203, the anode of the first light-emitting diode 201, and one terminal of the first voltage divider unit 204. The other terminal of the first voltage divider unit 204 is used to connect to a ground terminal. The cathode of the first light-emitting diode 201 is connected to the ground terminal 206. The first voltage is less than the threshold voltage of the first compensation transistor 202. The first driving transistor 203 is used to transmit voltage to the anode of the first light-emitting diode 201 when it is turned on. The threshold voltage of the first driving transistor 203 is the same as the threshold voltage of the first compensation transistor 202. The first compensation transistor 202 is used to compensate the threshold voltage of the first compensation transistor 202 at the second terminal of the first driving transistor 203 when it is turned on, so as to compensate the voltage of the anode of the first light-emitting diode 201. The brightness of the first light-emitting diode 201 is positively correlated with the voltage of the anode of the first light-emitting diode 201.

[0037] It should be noted that in this application, the first terminal is the drain and the second terminal is the source.

[0038] It can be understood that by setting the first compensation transistor 202 to cooperate with the first driving transistor 203, the threshold voltage of the first compensation transistor 202 is the same as that of the first driving transistor 203. When the first driving transistor 203 is turned on to transmit voltage to the anode of the first light-emitting diode 201, when the first compensation transistor 202 connected to the first power supply 205 is turned on, the first voltage input to the gate of the first compensation transistor 202 makes the output voltage of the second terminal include its own threshold voltage compensation amount. Since the threshold voltages of the two are the same, this compensation amount exactly offsets the voltage loss caused by the threshold voltage drift of the first driving transistor 203, so that the anode voltage of the first light-emitting diode 201 always remains stable. Since the brightness of the first light-emitting diode 201 is positively correlated with the anode voltage of the first light-emitting diode 201, the stability of the brightness of the first light-emitting diode 201 is achieved, and the uneven brightness caused by the threshold voltage drift is solved.

[0039] It should be noted that in existing pixel driving circuits, the threshold voltage of the driving transistor is easily affected by factors such as temperature and process deviation, which causes the voltage transmitted to the light-emitting diode to be unstable, resulting in fluctuations in the brightness of the light-emitting diode. In this scenario, the compensation method of this application can still offset the voltage loss caused by the drift of the threshold voltage of the driving transistor.

[0040] In one possible example, the pixel driving circuit further includes a second compensation transistor 207, the second terminal of which is connected to the gate of the first compensation transistor 202. The gate of the second compensation transistor 207 is used to input a first signal, the first terminal of the second compensation transistor 207 is used to input a first voltage, and the second terminal of the second compensation transistor 207 is used to transmit the first voltage to the gate of the first compensation transistor 202 when it is turned on.

[0041] Optionally, if the first voltage is directly input to the gate of the first compensation transistor 202, the lack of effective on / off control may cause the compensation transistor to be turned on when not needed, resulting in compensation disorder.

[0042] It is understood that the gate of the second compensation transistor 207 is controlled by the first signal. The first terminal of the second compensation transistor 207 is connected to the first voltage, and the second terminal of the second compensation transistor 207 is connected to the gate of the first compensation transistor 202. When the circuit needs voltage compensation, the first signal triggers the second compensation transistor 207 to conduct, and the first voltage is accurately transmitted to the gate of the first compensation transistor 202 through its second terminal, ensuring that the first compensation transistor 202 starts the compensation function at the appropriate time. When compensation is not needed, the first signal causes the second compensation transistor 207 to turn off, cutting off the transmission path of the first voltage and preventing the first compensation transistor 202 from malfunctioning. This controllable voltage transmission mechanism improves the accuracy of the compensation process and makes the gate voltage supply of the first compensation transistor 202 more flexible, allowing the compensation timing to be dynamically adjusted according to the working cycle of the pixel driving circuit.

[0043] In one possible example, the pixel driving circuit also includes a compensation capacitor 208, one end of which is connected to the second end of the first compensation transistor 202 and one end of the first voltage divider unit 204, and the other end of which is connected to the anode of the first light-emitting diode 201 and the second end of the first driving transistor 203.

[0044] It is understood that one end of the compensation capacitor 208 is connected to the second end of the first compensation transistor 202 and one end of the first voltage divider unit 204, and the other end of the compensation capacitor 208 is connected to the anode of the first light-emitting diode 201 and the second end of the first driving transistor 203. The compensation capacitor 208 has the characteristics of energy storage and voltage regulation. When the node voltage rises due to instantaneous load changes, the compensation capacitor 208 charges and stores excess energy; when the node voltage decreases due to the state switching of the first compensation transistor 202 or the first driving transistor 203, the compensation capacitor 208 discharges. The capacitor 208 releases electrical energy to compensate for voltage loss, thereby mitigating voltage fluctuations at the nodes. Furthermore, the compensation capacitor 208 enhances the anti-interference capability of the pixel driving circuit, reducing the impact of external noise or internal signal mutations on the anode voltage of the first light-emitting diode 201. By stabilizing the voltage of the first light-emitting diode 201, it ensures that its brightness remains uniform and stable, avoiding display distortion caused by voltage fluctuations. This makes the compensation function of the first compensation transistor 202 more stable, avoiding voltage surges during the compensation process and ensuring the display stability of the first light-emitting diode 201.

[0045] In one possible example, the pixel driving circuit further includes a first transistor 209, a second transistor 210, and a third transistor 211. The gates of the first transistor 209 and the second transistor 210 are both used to input a second signal. The first terminals of the first transistor 209 and the second transistor 210 are both used to input a second voltage. The second terminal of the first transistor 209 is connected to the second terminal of the third transistor 211, the gate of the first driving transistor 203, the first power supply 205, and the first terminal of the first driving transistor 203. The second terminal of the second transistor 210 is connected to the second terminal of the first driving transistor 203, the anode of the first light-emitting diode 201, and the other end of the compensation capacitor 208. The gate of the third transistor 211 is used to input a third signal, and the first terminal of the third transistor 211 is used to input a third voltage. The first transistor 209 is used to reset the voltage of the gate of the first driving transistor 203 when it is turned on, and the second transistor 210 is used to reset the voltage of the anode of the first light-emitting diode 201 when it is turned on.

[0046] Optionally, the threshold voltage of the first transistor 209, the threshold voltage of the second transistor 210, the threshold voltage of the third transistor 211, and the threshold voltage of the second compensation transistor 207 can be ignored.

[0047] It is understandable that when the circuit enters the reset phase, the second signal triggers the first transistor 209 and the second transistor 210 to conduct. The first transistor 209 transmits the second voltage to the gate of the first driving transistor 203, resetting its gate voltage to its initial state and eliminating the influence of residual voltage on the subsequent driving process. The second transistor 210 transmits the second voltage to the anode of the first light-emitting diode 201, resetting its voltage and ensuring accurate brightness control in the next cycle. This reset mechanism thoroughly clears residual voltage in the circuit, making the starting state of each working cycle consistent and improving the accuracy of voltage control. At the same time, the resetting effect of the first transistor 209 on the gate of the driving transistor ensures the stability of the compensation reference of the threshold voltage of the first driving transistor 203, and the resetting effect of the second transistor 210 on the anode of the first light-emitting diode 201 ensures the accuracy of brightness control and the stability of the light emission of the first light-emitting diode 201.

[0048] In one possible example, the pixel driving circuit further includes a first capacitor 212, one end of which is connected to the second terminal of the first transistor 209, the second terminal of the third transistor 211, and the gate of the first driving transistor 203, and the other end of which is connected to the first terminal of the first driving transistor 203 and the first power supply 205.

[0049] It can be understood that one end of the first capacitor 212 is connected to the second terminal of the first transistor 209, the second terminal of the third transistor 211, and the gate of the first driving transistor 203, while the other end of the first capacitor 212 is connected to the first terminal of the first driving transistor 203 and the first power supply 205. The coupling characteristics of the first capacitor 212 keep the voltage difference between the gate and the first terminal of the first driving transistor 203 relatively stable. When the voltage of the first power supply 205 fluctuates slightly or the gate voltage of the first driving transistor 203 changes due to external signals, the first capacitor 212 regulates the voltage across its terminals through charging and discharging to suppress sudden changes in the gate voltage. Simultaneously, the first capacitor 212 provides stable voltage support to the gate at the moment the first driving transistor 203 is turned on, ensuring it quickly enters a stable conduction state and reducing conduction delay. By stabilizing the gate voltage of the first driving transistor 203, the voltage transmitted to the anode of the first light-emitting diode 201 is made more precise.

[0050] In one possible example, the current of the first LED 201 is I, the third voltage is U1, the first voltage is U2, and the first coefficient of the first LED 201 is k, satisfying: I = k × (U1 - U2). 2 .

[0051] It can be understood that this formula establishes a quantitative relationship between the current of the first light-emitting diode 201 and the key control voltage. Through this quantitative relationship, the required values ​​of U1 and U2 can be calculated in reverse based on the required brightness of the first light-emitting diode 201 (the brightness of the first light-emitting diode 201 is positively correlated with the current). Then, the third voltage and the first voltage can be precisely controlled by the timing controller to achieve precise control of the brightness of the first light-emitting diode 201.

[0052] In one possible example, please refer to Figure 3 , Figure 3 This is a schematic diagram of a second structure of a pixel driving circuit provided in an embodiment of this application. The pixel driving circuit also includes a second light-emitting diode 213 and a second driving transistor 214. The gate of the second driving transistor 214 is connected to a second voltage, a first power supply 205, and a first terminal of the second driving transistor 214. The second terminal of the second driving transistor 214 is connected to the second terminal of a first compensation transistor 202, the anode of the second light-emitting diode 213, and one end of a first voltage divider unit 204. The cathode of the second light-emitting diode 213 is connected to a ground terminal 206. The second driving transistor 214 is used to transmit voltage to the anode of the second light-emitting diode 213 when it is turned on. The threshold voltage of the second driving transistor 214 is the same as the threshold voltage of the first compensation transistor 202. The first compensation transistor 202 is used to compensate the threshold voltage of the first compensation transistor 202 to the second terminal of the second driving transistor 214 when it is turned on, so as to compensate the voltage of the anode of the second light-emitting diode 213. The brightness of the second light-emitting diode 213 is positively correlated with the voltage of the anode of the second light-emitting diode 213.

[0053] It is understood that the gate of the second driving transistor 214 is connected to a second voltage, the first terminal of the second driving transistor 214 is connected to the first power supply 205, and the second terminal of the second driving transistor 214 is connected to the second terminal of the first compensation transistor 202, the anode of the second light-emitting diode 213, and one end of the first voltage divider unit 204. Since the threshold voltage of the second driving transistor 214 is the same as the threshold voltage of the first compensation transistor 202, it can share the compensation function of the first compensation transistor 202 with the first driving transistor 203. After the first compensation transistor 202 is turned on, the compensation voltage output from the second terminal of the first compensation transistor 202 can simultaneously offset the threshold voltage loss of the two driving transistors. This shared compensation mechanism eliminates the need for an additional compensation transistor for the second light-emitting diode 213, reducing the number of compensation transistors, greatly simplifying the circuit structure, and lowering hardware costs and circuit integration difficulty. Meanwhile, since the two driving transistors share the first compensation transistor 202, their compensation effect is highly consistent, ensuring the stability of the anode voltage of the first light-emitting diode 201 and the anode voltage of the second light-emitting diode 213. This satisfies the compensation requirements of multiple light-emitting diodes while also maintaining the simplicity of the circuit.

[0054] In one possible example, the pixel driving circuit also includes a third capacitor 215, one end of which is connected to the second end of the first compensation transistor 202 and one end of the first voltage divider unit 204, and the other end of which is connected to the anode of the second light-emitting diode 213 and the second end of the second driving transistor 214.

[0055] It is understood that one end of the third capacitor 215 is connected to the second end of the first compensation transistor 202 and one end of the first voltage divider unit 204, while the other end of the third capacitor 215 is connected to the anode of the second light-emitting diode 213 and the second end of the second driving transistor 214. The third capacitor 215 utilizes its energy storage and voltage stabilization characteristics to suppress voltage fluctuations at the node of the second light-emitting diode 213: when the node voltage rises, the third capacitor 215 charges; when the voltage drops, the third capacitor 215 discharges to replenish energy, ensuring stable node voltage. Moreover, the third capacitor 215 and the compensation capacitor 208 work synergistically to stabilize the voltage of the anodes of the two light-emitting diodes, avoiding voltage interference between the two light-emitting diodes. In addition, the third capacitor 215 also enhances the stability of the second driving transistor 214's operation and reduces the voltage surge to the second light-emitting diode 213 during its switching process.

[0056] Please refer to Figure 4 , Figure 4This is a schematic flowchart of a driving method provided in an embodiment of this application. Taking the driving process of this driving method applied to a display device as an example, the display device may include a server or electronic device. The driving method is applied to a pixel driving circuit as described above. The pixel driving circuit includes a first light-emitting diode, a first compensation transistor, a first driving transistor, and a first voltage divider unit. The gate of the first compensation transistor is used to input a first voltage, and the first terminal of the first compensation transistor is used to connect to a first power supply. The first terminal of the first driving transistor is connected to the first power supply, and the gate of the first driving transistor is used to input a second voltage. The second terminal of the first compensation transistor is used to connect to the second terminal of the first driving transistor, the anode of the first light-emitting diode, and one terminal of the first voltage divider unit. The other terminal of the first voltage divider unit is used to connect to a ground terminal, and the cathode of the first light-emitting diode is connected to the ground terminal. The first voltage is less than the threshold voltage of the first compensation transistor. The driving method includes the following steps S401-S402, wherein... S401: When the first driving transistor is turned on, it transmits voltage to the anode of the first light-emitting diode. The threshold voltage of the first driving transistor is the same as the threshold voltage of the first compensation transistor.

[0057] S402: When the first compensation transistor is turned on, the voltage at the second terminal of the first driving transistor is reduced to lower the threshold voltage of the first compensation transistor, so as to compensate the voltage of the anode of the first light-emitting diode. The brightness of the first light-emitting diode is positively correlated with the voltage of the anode of the first light-emitting diode.

[0058] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 5 As shown, the display device includes a timing controller 501, a pixel driving circuit 502, a processor 503, a memory 504, and one or more programs 505. The one or more programs 505 are stored in the memory 504 and configured to be executed by the processor 503. The processor 503 controls the timing controller 501 to send signals. The timing controller 501 is electrically connected to the pixel driving circuit 502. Please refer to [reference needed]. Figure 6 The timing controller 501 is used to transmit the first signal, the second signal, and the third signal of the pixel driving circuit 502 to the pixel driving circuit 502. The specific waveforms of the first signal, the second signal, and the third signal are as follows: Figure 6 As shown, the above procedure 505 includes instructions for performing the following steps: When the first driving transistor is turned on, it transmits voltage to the anode of the first light-emitting diode. The threshold voltage of the first driving transistor is the same as the threshold voltage of the first compensation transistor. When the first compensation transistor is turned on, it reduces the threshold voltage of the first compensation transistor by reducing the voltage at the second terminal of the first driving transistor, thereby compensating for the voltage at the anode of the first light-emitting diode. The brightness of the first light-emitting diode is positively correlated with the voltage at the anode of the first light-emitting diode.

[0059] Optionally, in the reset state, the second signal is high, and the first and third signals are both low. In the compensation state, the first signal is high, and the second and third signals are both low. During the illumination phase of the first LED, the third and first signals are both high, and the second signal is low.

[0060] Those skilled in the art will understand that, for ease of explanation, Figure 4 Only one memory and processor are shown in the illustration. In a real terminal or server, multiple processors and memories may exist. Memory can also be called storage medium or storage device, etc., and this application does not limit this.

[0061] It should be understood that in this application, the processor can be a Central Processing Unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor can also be a general-purpose microprocessor, graphics processing unit (GPU), or one or more integrated circuits to execute relevant programs to achieve the functions required by the embodiments of this application.

[0062] The processor can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of this application can be completed through integrated logic circuits in the processor hardware or instructions in software form. The aforementioned processor can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The steps of the methods disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the functions required by the units included in the methods, apparatus, and storage media of the embodiments of this application.

[0063] It should also be understood that the memory mentioned in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Specifically, non-volatile memory can be read-only memory (ROm), programmable read-only memory (PROm), erasable programmable read-only memory (EPROm), electrically erasable programmable read-only memory (EEPROm), or flash memory. Volatile memory can be random access memory (RAm), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRRAM), Synchronous Dynamic Random Access Memory (SDRAm), Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRRAM), Synchlink Dynamic Random Access Memory (SLDRRAM), and Direct Rambus Random Access Memory (DRRAM). The memory can also be a Compact Disc Read-Only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media, or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures that can be accessed by a computer, but is not limited thereto. The memory can exist independently and be connected to the processor via a bus. Alternatively, the memory can be integrated with the processor. The memory can store programs, and when the program stored in the memory is executed by the processor, the processor performs the various steps of the method determined in the above embodiments of this application.

[0064] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) is integrated into the processor. It should be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0065] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software. The steps of the method disclosed in the embodiments of this application can be directly implemented by a hardware processor, or by a combination of hardware and software modules within the processor. The software modules can reside in mature storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. Since this storage medium is located in memory, the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method; to avoid repetition, these will not be described in detail here.

[0067] Those skilled in the art will recognize that the various illustrative logical blocks (ILBs) and steps 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 implementations should not be considered beyond the scope of this application.

[0068] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as a computer-programmed program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a processor, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic) or wireless (e.g., infrared, wireless, microwave, etc.) means, or from one website, computer, server, or data center to a mobile phone processor via a wired means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive), etc.

[0069] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A pixel driving circuit, characterized by comprising: The pixel driving circuit comprises a first light emitting diode, a first compensation transistor, a first driving transistor and a first voltage dividing unit, a gate of the first compensation transistor is used for inputting a first voltage, a first end of the first compensation transistor is used for being connected with a first power supply, a first end of the first driving transistor is connected with the first power supply, a gate of the first driving transistor is used for inputting a second voltage, a second end of the first compensation transistor is used for being connected with a second end of the first driving transistor, an anode of the first light emitting diode and one end of the first voltage dividing unit, the other end of the first voltage dividing unit is used for being connected with a ground end, a cathode of the first light emitting diode is connected with the ground end, the first voltage is less than a threshold voltage of the first compensation transistor, the first driving transistor is used for transmitting a voltage to the anode of the first light emitting diode when turned on, the threshold voltage of the first driving transistor is the same as the threshold voltage of the first compensation transistor, the first compensation transistor is used for reducing the threshold voltage of the first compensation transistor to the voltage of the second end of the first driving transistor when turned on, so as to compensate the voltage of the anode of the first light emitting diode, and the brightness of the first light emitting diode is in a positive correlation with the voltage of the anode of the first light emitting diode.

2. The pixel driving circuit of claim 1, wherein, The pixel driving circuit further comprises a second compensation transistor, a second end of the second compensation transistor is connected with the gate of the first compensation transistor, a gate of the second compensation transistor is used for inputting a first signal, a first end of the second compensation transistor is used for inputting the first voltage, and the second end of the second compensation transistor is used for transmitting the first voltage to the gate of the first compensation transistor when turned on.

3. The pixel driving circuit according to any one of claims 1 to 2, characterized in that, The pixel driving circuit further comprises a compensation capacitor, one end of the compensation capacitor is connected with the second end of the first compensation transistor and one end of the first voltage dividing unit, and the other end of the compensation capacitor is connected with the anode of the first light emitting diode and the second end of the first driving transistor.

4. The pixel driving circuit of claim 3, wherein, The pixel driving circuit further comprises a first transistor, a second transistor and a third transistor, a gate of the first transistor and a gate of the second transistor are both used for inputting a second signal, a first end of the first transistor and a first end of the second transistor are both used for inputting the second voltage, a second end of the first transistor is connected with a second end of the third transistor, a gate of the first driving transistor, the first power supply, a first end of the first driving transistor, a second end of the second transistor is connected with the second end of the first driving transistor, the anode of the first light emitting diode and the other end of the compensation capacitor, a gate of the third transistor is used for inputting a third signal, a first end of the third transistor is used for inputting a third voltage, and the first transistor is used for resetting the voltage of the gate of the first driving transistor when turned on, and the second transistor is used for resetting the voltage of the anode of the first light emitting diode when turned on.

5. The pixel driving circuit of claim 4, wherein, The pixel driving circuit further comprises a first capacitor, one end of the first capacitor is connected with the second end of the first transistor, the second end of the third transistor, and the gate of the first driving transistor, and the other end of the first capacitor is connected with the first end of the first driving transistor and the first power supply.

6. The pixel driving circuit of claim 5, wherein, The current of the first light emitting diode is I, the third voltage is U1, the first voltage is U2, and the first coefficient of the first light emitting diode is k, and the following is satisfied: I=k×(U1-U2) 2 .

7. The pixel driving circuit of claim 1, wherein, The pixel driving circuit further comprises a second light emitting diode and a second driving transistor, the gate of the second driving transistor is connected with the second voltage, the first power supply, and the first end of the second driving transistor, the second end of the second driving transistor is connected with the second end of the first compensation transistor, the anode of the second light emitting diode, and one end of the first voltage dividing unit, the cathode of the second light emitting diode is connected with the ground terminal, the second driving transistor is used to transmit voltage to the anode of the second light emitting diode when turned on, the threshold voltage of the second driving transistor is the same as that of the first compensation transistor, the first compensation transistor is used to compensate the threshold voltage of the first compensation transistor for the second end of the second driving transistor when turned on, so as to compensate the voltage of the anode of the second light emitting diode, and the brightness of the second light emitting diode is positively correlated with the voltage of the anode of the second light emitting diode.

8. The pixel driving circuit of claim 7, wherein, The pixel driving circuit further comprises a third capacitor, one end of the third capacitor is connected with the second end of the first compensation transistor and one end of the first voltage dividing unit, and the other end of the third capacitor is connected with the anode of the second light emitting diode and the second end of the second driving transistor.

9. A driving method, comprising: The driving method is applied to the pixel driving circuit as claimed in any one of claims 1 to 8, the pixel driving circuit comprises a first light emitting diode, a first compensation transistor, a first driving transistor, and a first voltage dividing unit, the gate of the first compensation transistor is used to input a first voltage, the first end of the first compensation transistor is connected with a first power supply, the first end of the first driving transistor is connected with the first power supply, the gate of the first driving transistor is used to input a second voltage, the second end of the first compensation transistor is connected with the second end of the first driving transistor, the anode of the first light emitting diode, and one end of the first voltage dividing unit, the other end of the first voltage dividing unit is connected with a ground terminal, the cathode of the first light emitting diode is connected with the ground terminal, the first voltage is less than the threshold voltage of the first compensation transistor, and the method comprises: transmitting voltage to the anode of the first light emitting diode through the first driving transistor when turned on, the threshold voltage of the first driving transistor is the same as that of the first compensation transistor; compensating the threshold voltage of the first compensation transistor for the voltage of the second end of the first driving transistor through the first compensation transistor when turned on, so as to compensate the voltage of the anode of the first light emitting diode, and the brightness of the first light emitting diode is positively correlated with the voltage of the anode of the first light emitting diode.

10. A display device, characterized by The pixel driving circuit according to any one of claims 1 to 8, further comprising a timing controller electrically connected to the pixel driving circuit, the timing controller configured to transmit the first signal, the second signal and the third signal of the pixel driving circuit to the pixel driving circuit.

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