Pixel driving circuit, array substrate, display panel and display device

Abstract

The invention relates to a pixel driving circuit, an array substrate, a display panel and a display device. The pixel driving circuit comprises a light-emitting control unit, a light-emitting pixel, a storage capacitor, a compensation write-in unit, a driving transistor and a compensation transistor. The light-emitting control unit is connected to a first voltage. The first end of the light-emitting pixel is connected with a second voltage, and the second end is connected with the second end of the light-emitting control unit. The first end of the storage capacitor is connected with a first voltage. The first end of the compensation write-in unit is connected with third voltage. The first end of the driving transistor is connected with the second end of the compensation write-in unit and the third end of the light-emitting control unit, the controlled end of the driving transistor is connected with the second end of the storage capacitor, and the second end of the driving transistor is connected with the third end of the compensation write-in unit and the fourth end of the light-emitting control unit. The compensation transistor is arranged on a compensation write-in path between the storage capacitor and the light-emitting control unit, and under the driving of the target voltage, the electric charge quantity corresponding to the target voltage is transmitted to the storage capacitor in the data write-in stage.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular, to a pixel driving circuit, an array substrate, a display panel, and a display device. Background Art

[0002] With the continuous development of display technology, display technology has become one of the core components of modern electronic devices. From the early cathode ray tube (CRT) displays to the widely used liquid crystal displays (LCDs), organic light-emitting diode (OLED) displays, as well as emerging micro light-emitting diode (Micro LED) and quantum dot display technologies, the progress of display technology has greatly enriched people's visual experience. However, with the continuous expansion of application scenarios and the increasing diversification of user needs, the public's requirements for the performance of the screen are also constantly improving.

[0003] Among many performance indicators, the uniformity of screen brightness is one of the key factors affecting user experience. An ideal display screen should provide uniform brightness throughout the display area to ensure that the details of images and videos can be accurately presented, while avoiding visual fatigue caused by brightness differences.

[0004] However, the existing display technologies still face the problem of uneven brightness at different positions in actual applications, which affects the display effect of display devices. Summary of the Invention

[0005] Based on this, it is necessary to provide a display panel and a display device, aiming to improve the problem of uneven brightness at different positions in related display technologies.

[0006] In a first aspect, an embodiment of the present application provides a pixel driving circuit, including:

[0007] A light-emitting control unit, a first end of the light-emitting control unit is used to access a first voltage;

[0008] A light-emitting pixel, a first end of the light-emitting pixel is used to access a second voltage, and a second end of the light-emitting pixel is connected to a second end of the light-emitting control unit;

[0009] A storage capacitor, a first end of the storage capacitor is used to access the first voltage;

[0010] A compensation writing unit, a first end of the compensation writing unit is used to access a third voltage;

[0011] A driving transistor, a first end of the driving transistor is respectively connected to a second end of the compensation writing unit and a third end of the light emitting control unit, a controlled end of the driving transistor is connected to a second end of the storage capacitor, and a second end of the driving transistor is connected to a third end of the compensation writing unit and a fourth end of the light emitting control unit;

[0012] A compensation transistor, a first end and a second end of the compensation transistor are disposed on a compensation writing path between the storage capacitor and the light emitting control unit, a controlled end of the compensation transistor is used to access a target voltage, and under the drive of the target voltage, the compensation transistor transfers a charge amount corresponding to the target voltage to the storage capacitor during a data writing stage; the target voltage is the first voltage or the second voltage;

[0013] Wherein, the compensation writing unit is used to conduct the third voltage to the compensation transistor during a data writing stage; the light emitting control unit is used to conduct the first voltage to the driving transistor during a light emitting stage, so that the driving transistor outputs a driving current under the action of a driving voltage provided by the storage capacitor based on stored charges; the light emitting pixel is used to emit light under the action of the driving current and the second voltage.

[0014] In a second aspect, an embodiment of the present application further provides an array substrate, including:

[0015] Multiple pixel driving circuits as described in the first aspect; the multiple pixel driving circuits are arranged in an array;

[0016] A first power supply line, connected to the pixel driving circuits in the same row or the same column, one end of the first power supply line is connected to a first power supply; the first power supply is used to provide a first voltage to the multiple pixel driving circuits through the first power supply line;

[0017] A second power supply line, connected to the pixel driving circuits in the same row or the same column, one end of the second power supply line is connected to a second power supply; the second power supply is used to provide a second voltage to the multiple pixel driving circuits through the second power supply line;

[0018] A third power supply line, connected to the pixel driving circuits in the same row or the same column, one end of the third power supply line is connected to a third power supply; the third power supply is used to provide a third voltage to the multiple pixel driving circuits through the third power supply line.

[0019] In a third aspect, the present application further provides a display panel, including the pixel driving circuit as described in the first aspect, or,

[0020] The array substrate as described in the second aspect.

[0021] In a fourth aspect, the present application further provides a display device, including the display panel as described in the third aspect.

[0022] In the pixel driving circuit provided by the embodiments of the present application, a compensation transistor is arranged on a compensation writing path between a storage capacitor and a light-emitting control unit. The compensation transistor transfers a charge quantity corresponding to a first voltage or a second voltage to the storage capacitor during a data writing stage under the drive of the first voltage or the second voltage. The light-emitting control unit conducts the first voltage to a driving transistor during a light-emitting stage, so that the driving transistor outputs a driving current under the action of a driving voltage provided by the storage capacitor based on the stored charge, and the light-emitting pixel emits light under the action of the driving current and the second voltage. It can be seen that the magnitude of the driving current in the present application corresponds to the charge quantity stored in the storage capacitor, and the charge quantity stored in the storage capacitor corresponds to the first voltage or the second voltage. Therefore, the magnitude of the driving current corresponds to the first voltage or the second voltage. Therefore, when the magnitudes of the first voltage or the second voltage received by the proximal and distal ends in the pixel driving circuit are inconsistent, resulting in inconsistent brightness of the corresponding light-emitting pixels, a correspondence relationship between the first voltage or the second voltage and the brightness of the light-emitting pixels can be established in the present application, so as to adaptively adjust the brightness of the light-emitting pixels at the proximal and distal ends in the display surface corresponding to the pixel driving circuit, and improve the display brightness uniformity. Description of the Drawings

[0023] Figure 1 is one of the schematic structural diagrams of the pixel driving circuit provided by the embodiments of the present application;

[0024] Figure 2 is the schematic structural diagram of the light-emitting control unit provided by the embodiments of the present application;

[0025] Figure 3 is the schematic structural diagram of the first reset unit provided by the embodiments of the present application;

[0026] Figure 4 is one of the schematic diagrams of the setting position of the compensation transistor provided by the embodiments of the present application;

[0027] Figure 5 is the second schematic diagram of the setting position of the compensation transistor provided by the embodiments of the present application;

[0028] Figure 6 is the second schematic structural diagram of the pixel driving circuit provided by the embodiments of the present application;

[0029] Figure 7 is the timing diagram of the first scan signal, the second scan signal, the third scan signal, the fourth scan signal and the light-emitting control signal provided by the embodiments of the present application;

[0030] Figure 8Schematic structural diagram of the display device provided by the embodiment of the present application.

[0031] Explanation of the reference numerals in the drawings:

[0032] 10: Display panel; 100: Pixel driving circuit; 110: Light emission control unit; 120: Light emitting pixel; 130: Storage capacitor; 140: Compensation writing unit; 141: Data writing transistor; 142: First compensation writing transistor; 143: Second compensation writing transistor; 150: Driving transistor; 160: Compensation transistor; 170: First reset unit; 180: Second reset unit; 190: Third reset unit; 20: Display device. Detailed implementation manners

[0033] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure content of the present application more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] When describing the positional relationship, unless otherwise specified, when an element such as a layer, film or substrate is referred to as being "on" another element, it can be directly on the other element or there can also be intermediate elements. Further, when a layer is referred to as being "under" another layer, it can be directly below or there can be one or more intermediate elements. It can also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or there can also be one or more intermediate elements.

[0036] In the case of using "including", "having", and "comprising" described herein, unless an explicit limiting term is used, such as "only", "consisting of", etc., another component can also be added. Unless otherwise mentioned, the singular form of the term can include the plural form and cannot be understood as having a quantity of one.

[0037] It should be understood that although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0038] It should also be understood that when interpreting an element, although not explicitly described, the element is interpreted to include an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximate" or "substantially" may mean within one or more standard deviations, which are not defined herein.

[0039] In addition, in the specification, the phrase "schematic diagram of planar distribution" refers to the drawing when observing the target part from above, and the phrase "schematic cross-sectional view" refers to the drawing when observing the cross-section taken by vertically cutting the target part from the side.

[0040] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are only drawn by way of example in the drawings and not necessarily to the true scale.

[0041] As described in the background art section, in the related art, the display panel is prone to the phenomenon of uneven brightness at a large viewing angle. The inventor found that the reason for the above phenomenon is that as the viewing angle increases, in a large-size or high-resolution display screen, the resistance of the power supply line and the signal line will cause a voltage difference at different positions. In a display device, the voltage at the power supply end is relatively high, while the voltage at a position far from the power supply end will gradually decrease. This voltage difference causes the brightness performance of different regions of the screen to be inconsistent. For example, the region near the power supply end may have a higher brightness, while the region far from the power supply end has a lower brightness.

[0042] Based on the above technical problems, the inventors have studied and found that by setting compensation elements in the pixel driving circuit to compensate the voltages received at different positions to a corresponding degree, the phenomenon of uneven brightness at different positions can be improved. Based on this, the inventors have further developed the technical solution of the embodiments of the present application. Specifically, the pixel driving circuit provided in the embodiments of the present application is provided with a compensation transistor on the compensation writing path between the storage capacitor and the light-emitting control element. The opening and closing degree of the compensation transistor corresponds to the first voltage or the second voltage, so as to transfer the electric charge corresponding to the first voltage or the second voltage to the storage capacitor during the data writing stage. By adopting the above technical solution, at the position where the received first voltage or second voltage is lower, the compensation transistor can provide a smaller degree of opening and transfer less electric charge to the storage capacitor, so that the driving transistor can provide a larger degree of opening and output a larger driving current to the corresponding light-emitting pixel, so that the corresponding light-emitting pixel can emit light under a larger driving current, thereby compensating the light-emitting brightness of the light-emitting pixel. Thus, the problem of uneven brightness at different positions in the related display technology can be improved.

[0043] The above is the core idea of the present application. Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0044] The pixel driving circuit in the embodiments of the present application is a key part for realizing the light emission of the light-emitting pixel in the display panel. The process of the pixel driving circuit realizing the light emission of the light-emitting pixel can be divided into multiple stages. In the embodiments of the present application, the process of the pixel driving circuit realizing the light emission of the light-emitting pixel includes three stages: a data writing stage, a reset stage, and a light-emitting stage, which will be explained as an example. Among them, in the data writing stage, the compensation transistor will transfer the electric charge corresponding to the target voltage to the storage capacitor, and the electric charge stored in the storage capacitor will determine the conduction degree of the driving transistor in the light-emitting stage, thereby controlling the light-emitting brightness of the light-emitting pixel. The reset stage can be before or after the data writing stage. In the reset stage, the reset unit in the pixel driving circuit will perform a reset operation to reset the potentials of some nodes in the pixel driving circuit, such as the potential of the connection node between the driving transistor and the light-emitting control transistor, and the potentials at both ends of the storage capacitor, etc., to the corresponding reset voltage, so as to improve the stability of the circuit, reduce the interference and error between different frames, and thus improve the quality and stability of the display screen. When the data writing is completed and after the reset operation, the light-emitting stage will be entered. In the light-emitting stage, the light-emitting control signal makes the light-emitting control unit conduct, and the driving transistor outputs a corresponding driving current according to the electric charge stored in the storage capacitor, so that the light-emitting pixel emits light under the action of the driving current and the corresponding power supply voltage (such as the second voltage in the embodiments of the present application).

[0045] In one embodiment, referring to the attached Figure 1 , the attached Figure 1 shows one of the structural schematic diagrams of the pixel driving circuit 100 in this embodiment. In this embodiment, the pixel driving circuit 100 includes a light emitting control unit 110, a light emitting pixel 120, a storage capacitor 130, a compensation writing unit 140, a driving transistor 150, and a compensation transistor 160. The first end of the light emitting control unit 110 is used to connect to the first voltage PVDD. The first end of the light emitting pixel 120 is used to connect to the second voltage PVEE, and the second end of the light emitting pixel 120 is connected to the second end of the light emitting control unit 110. The first end of the storage capacitor 130 is used to connect to the first voltage PVDD. The first end of the compensation writing unit 140 is used to connect to the third voltage Vdata. The first end of the driving transistor 150 is respectively connected to the second end of the compensation writing unit 140 and the third end of the light emitting control unit 110. The controlled end of the driving transistor 150 is connected to the second end of the storage capacitor 130. The second end of the driving transistor 150 is connected to the third end of the compensation writing unit 140 and the fourth end of the light emitting control unit 110. The first end and the second end of the compensation transistor 160 are disposed on the compensation writing path between the storage capacitor 130 and the light emitting control unit 110. The controlled end of the compensation transistor 160 is used to connect to the target voltage Vg. Under the drive of the target voltage Vg, the compensation transistor 160 transfers the charge amount corresponding to the target voltage Vg to the storage capacitor 130 during the data writing stage; the target voltage Vg is the first voltage PVDD or the second voltage PVEE.

[0046] Among them, the compensation writing unit 140 is used to conduct the third voltage Vdata to the compensation transistor 160 during the data writing stage; the light emitting control unit 110 is used to conduct the first voltage PVDD to the driving transistor 150 during the light emitting stage, so that the driving transistor 150 outputs a driving current under the action of the driving voltage provided by the storage capacitor 130 based on the stored charge; the light emitting pixel 120 is used to emit light under the action of the driving current and the second voltage PVEE.

[0047] Among them, the first voltage PVDD in the embodiment of the present application can be a positive voltage, and the second voltage PVEE can be a negative voltage. In the embodiment of the present application, the magnitude relationship of the first voltage PVDD is positively correlated with the opening and closing degree of the compensation transistor 160, and the magnitude relationship of the second voltage PVEE is negatively correlated with the opening and closing degree of the compensation transistor 160. The opening and closing degree of the driving transistor 150 affects the magnitude of the driving current, and the opening and closing degree of the driving transistor 150 is affected by the charge amount received by the storage capacitor 130 during the data access stage. The opening and closing degree of the driving transistor 150 is negatively correlated with the charge amount in the storage capacitor 130.

[0048] In the related art, the higher the first voltage PVDD is, the higher the brightness of the light-emitting pixel 120 is. The lower the second voltage PVEE is, the higher the brightness of the light-emitting pixel is. Therefore, at a position where the first voltage PVDD is relatively high, the corresponding light-emitting pixel 120 will be brighter, and at a position where the second voltage PVEE is relatively low, the corresponding light-emitting pixel 120 will also be brighter. Through the pixel driving unit in the embodiment of the present application, for example, at a position where the received first voltage PVDD is relatively large, the opening degree of the compensation transistor 160 correspondingly increases to transfer more charge amount to the storage capacitor 130, so that the opening degree of the driving transistor 150 decreases, thereby providing a smaller driving current to the light-emitting pixel 120, reducing the brightness applicability of the corresponding light-emitting pixel 120. At a position where the received first voltage PVDD is relatively small, the opening degree of the compensation transistor 160 is relatively small to transfer less charge amount to the storage capacitor 130, so that the opening degree of the driving transistor 150 increases, thereby providing a larger driving current to the light-emitting pixel 120, increasing the brightness applicability of the corresponding light-emitting pixel 120.

[0049] Another example is that at a position where the received second voltage PVEE is relatively large, the opening degree of the compensation transistor 160 is relatively small, which can transfer less charge amount to the storage capacitor 130, and the opening degree of the driving transistor 150 increases, which can provide a larger driving current to the light-emitting pixel 120, increasing the brightness applicability of the corresponding light-emitting pixel 120. At a position where the received second voltage PVEE is relatively small, the opening degree of the compensation transistor 160 is relatively large, which can transfer more charge amount to the storage capacitor 130, and the opening degree of the driving transistor 150 decreases, which can provide a smaller driving current to the light-emitting pixel 120, reducing the brightness applicability of the light-emitting pixel 120.

[0050] In summary, in the pixel driving circuit 100 provided in this embodiment, by providing a compensation transistor 160 on the compensation writing path between the storage capacitor 130 and the light-emitting control unit 110, the compensation transistor 160 transfers the electric charge corresponding to the first voltage PVDD or the second voltage PVEE to the storage capacitor 130 during the data writing stage under the driving of the first voltage PVDD or the second voltage PVEE. During the light-emitting stage, the light-emitting control unit 110 conducts the first voltage PVDD to the driving transistor 150, so that the driving transistor 150 outputs a driving current under the action of the driving voltage provided by the storage capacitor 130 based on the stored charge, and the light-emitting pixel 120 emits light under the action of the driving current and the second voltage PVEE. It can be seen that the magnitude of the driving current in this application corresponds to the amount of electric charge stored in the storage capacitor 130, and the amount of electric charge stored in the storage capacitor 130 corresponds to the first voltage PVDD or the second voltage PVEE. Therefore, the magnitude of the driving current corresponds to the first voltage PVDD or the second voltage PVEE. Therefore, when the magnitudes of the first voltage PVDD or the second voltage PVEE received by the near and far ends in the pixel driving circuit 100 are inconsistent, resulting in inconsistent brightness of the corresponding light-emitting pixels 120, this application can establish a correspondence between the first voltage PVDD or the second voltage PVEE and the brightness of the light-emitting pixels 120, so as to adaptively adjust the brightness of the light-emitting pixels 120 at the near and far ends in the display surface corresponding to the pixel driving circuit 100, and improve the display brightness uniformity.

[0051] In some embodiments, refer to the attached Figure 2 , the attached Figure 2 shows a schematic structural diagram of the light-emitting control unit 110. The light-emitting control unit 110 in this embodiment may include a first light-emitting control transistor M1 and a second light-emitting control transistor M2. The first end of the first light-emitting control transistor M1 is used to connect to the first voltage PVDD. The second end of the first light-emitting control transistor M1 is connected to the first end of the driving transistor 150. The controlled end of the first light-emitting control transistor M1 is connected to the controlled end of the second light-emitting control transistor M2 for connecting to the light-emitting control signal Emit. The first end of the second light-emitting control transistor M2 is connected to the second end of the driving transistor 150, and the second end of the second light-emitting control transistor M2 is connected to the second end of the light-emitting pixel 120.

[0052] In some embodiments, the pixel driving circuit 100 in this embodiment further includes a first reset unit 170. The first end of the first reset unit 170 is used to access a first reset voltage DVH. The second end of the first reset unit 170 is respectively connected to the third end of the light emitting control unit 110 and the second end of the compensation writing unit 140. The controlled end of the first reset unit 170 is used to access a first scan signal SP*. The first reset unit 170 transmits the first reset voltage DVH to the third end of the light emitting control unit 110 and the second end of the compensation writing unit 140 under the drive of the first scan signal SP*.

[0053] Wherein, the first reset unit 170 can be any controlled switch, as long as it can realize the signal transmission line between the first reset voltage DVH and the third end of the light emitting control unit 110 under the drive of the first scan signal SP*. Exemplarily, refer to the appendix Figure 3 , appendix Figure 3 shows a schematic structural diagram of the first reset unit 170. The first reset unit 170 in this embodiment may include a first reset transistor M3. The first end of the first reset transistor M3 is used to access the first reset voltage DVH. The second end of the first reset transistor M3 is connected to the third end of the light emitting control unit 110 and the second end of the compensation writing unit 140. The controlled end of the first reset transistor M3 is used to access the first scan signal SP*.

[0054] In this embodiment, the first reset unit 170 can reset the potentials of the third end of the light emitting control unit 110 and the second end of the compensation writing unit 140 under the drive of the first reset signal, which can, to a certain extent, eliminate the influence brought by the threshold voltage of the driving transistor 150 connected to the third end of the light emitting control unit 110, ensure the stable output of the driving current, and thus improve the reliability and stability of the pixel driving circuit 100.

[0055] In some embodiments, the target voltage is the first voltage or the first reset voltage; the type of the compensation transistor includes an N-type transistor.

[0056] Wherein, the first reset voltage is a positive voltage. The first reset voltage is positively correlated with the opening and closing degree of the compensation transistor.

[0057] In the related art, the larger the first reset voltage is, the stronger the brightness of the light-emitting pixel at the corresponding position is. However, through the pixel driving circuit in the embodiments of the present application, at the position where the first reset voltage is relatively large, the opening degree of the compensation transistor is also relatively large, and more electric charges are transmitted to the storage capacitor, so that the opening degree of the driving transistor is reduced, thereby reducing the driving current output to the light-emitting pixel, and thus reducing the light-emitting brightness of the light-emitting pixel, realizing brightness compensation. On the contrary, at the position where the first reset voltage is relatively small, the opening degree of the compensation transistor is also reduced, and fewer electric charges are transmitted to the storage capacitor, so that the opening degree of the driving transistor is increased, thereby increasing the driving current output to the light-emitting pixel, and increasing the light-emitting brightness of the corresponding light-emitting pixel.

[0058] In this embodiment, the target voltage can be the first voltage or the first reset voltage. The first voltage and the first reset voltage are only positive voltages. Correspondingly, the type of the compensation transistor includes an N-type transistor, so that the opening and closing degree of the compensation transistor can adapt to the magnitudes of the first voltage and the first reset voltage. When the first voltage or the first reset voltage is relatively large, the opening and closing degree is increased to transmit more electric charges to the storage capacitor, thereby reducing the brightness of the corresponding light-emitting pixel and realizing brightness compensation.

[0059] In some embodiments, the target voltage is the second voltage; the type of the compensation transistor includes a P-type transistor.

[0060] Among them, the second voltage is a negative voltage.

[0061] In this embodiment, when the second voltages received at different positions are different, the type of the compensation transistor includes a P-type transistor. When the second voltage is relatively small, the opening and closing degree of the compensation transistor is relatively large, and more electric charges can be transmitted, so that the brightness of the corresponding light-emitting pixel is reduced, thereby compensating for the high brightness caused by the small second voltage. When the second voltage is relatively large, the opening and closing degree of the compensation transistor is relatively small, and fewer electric charges can be transmitted, so that the brightness of the corresponding light-emitting pixel is increased, thereby compensating for the low brightness caused by the large second voltage.

[0062] It can be understood that in the embodiments of the present application, the opening and closing degree of the compensation transistor, that is, the amount of electric charges transmitted by the compensation transistor during the data writing stage, corresponds to the magnitude of the target voltage it receives. Therefore, the degree of brightness compensation for the corresponding light-emitting pixel corresponds to the difference between the target voltages received at each position. Therefore, the pixel driving circuit in the embodiments of the present application can adaptively compensate for the brightness difference at each position, significantly improving the brightness uniformity of the light-emitting pixels at each position.

[0063] In some embodiments, refer to the attached Figure 4 , attached Figure 4Shows one of the schematic diagrams of the setting positions of the compensation transistor 160. The compensation writing unit 140 includes a data writing transistor 141 and a first compensation writing transistor 142.

[0064] The first end of the data writing transistor 141 is used to access the third voltage Vdata. The second end of the data writing transistor 141 is connected to the first end of the driving transistor 150. The controlled end of the data writing transistor 141 is used to access the second scanning signal SP. During the data writing stage, under the driving of the second scanning signal SP, the data writing transistor 141 conducts the third voltage Vdata to the compensation writing path through the driving transistor 150.

[0065] The first compensation writing transistor 142 is arranged on the compensation writing path. The first end of the first compensation writing transistor 142 is connected to the second end of the driving transistor 150. The second end of the first compensation writing transistor 142 is connected to the first end of the compensation transistor 160. The controlled end of the first compensation writing transistor 142 is used to access the third scanning signal S2N during the data writing stage. The first compensation writing transistor 142 is used to conduct the third voltage Vdata to the compensation transistor 160 under the driving of the third scanning signal S2N during the data writing stage, so that the compensation transistor 160 transfers the electric charge corresponding to the target voltage Vg to the storage capacitor 130 based on the third voltage Vdata under the driving of the target voltage Vg.

[0066] In this embodiment, the compensation transistor 160 is arranged between the first compensation writing transistor 142 and the storage capacitor 130. Thus, during the data writing stage, when the third scanning signal S2N effectively drives the first compensation writing transistor 142, the compensation transistor 160 directly transfers the electric charge corresponding to the target voltage Vg to the storage capacitor 130 based on the third voltage Vdata under the driving of the target voltage Vg, ensuring the real-time performance of the brightness compensation for the light-emitting pixel 120.

[0067] In some embodiments, refer to the appendix Figure 5 , appendix Figure 5 Shows the second schematic diagram of the setting position of the compensation transistor 160. The compensation transistor 160 may include a data writing transistor 141 and a second compensation writing transistor 143.

[0068] The first end of the data writing transistor 141 is used to access the third voltage Vdata. The second end of the data writing transistor 141 is connected to the first end of the driving transistor 150. The controlled end of the data writing transistor 141 is used to access the second scanning signal SP. During the data writing stage, under the driving of the second scanning signal SP, the data writing transistor 141 conducts the third voltage Vdata to the compensation writing path through the driving transistor 150.

[0069] The second compensation writing transistor 143 is provided on the compensation writing path. The first end of the second compensation writing transistor 143 is connected to the storage capacitor 130. The second end of the second compensation writing transistor 143 is connected to the first end of the compensation transistor 160. The control end of the second compensation writing transistor 143 is used to access the third scan signal S2N during the data writing stage. The second compensation writing transistor 143 is used to conduct the charge quantity corresponding to the target voltage Vg transmitted by the driving transistor 150 to the storage capacitor 130 under the drive of the third scan signal S2N during the data writing stage.

[0070] In this embodiment, the compensation transistor 160 is provided between the second compensation writing transistor 143 and the driving transistor 150. During the data writing stage, the compensation transistor 160 indirectly transmits the charge quantity corresponding to the target voltage Vg to the storage capacitor 130 through the second compensation writing transistor 143 to achieve the brightness compensation of the light-emitting pixel 120.

[0071] In the embodiment of the present application, the subthreshold swing of the compensation transistor can be increased to improve the matching degree between the compensation transistor and the target voltage, so that the charge quantity transmitted by the compensation transistor can more accurately correspond to the target voltage, that is, the charge quantity transmitted by the compensation transistor can more accurately reflect the magnitude of the target voltage, thereby more accurately compensating the brightness of the light-emitting pixel. Exemplarily, in some embodiments, the subthreshold swing of the compensation transistor is greater than 0.5.

[0072] In some embodiments, the pixel driving circuit 100 in the embodiment of the present application may further include a second reset unit 180 and a third reset unit 190. The second reset unit 180 includes a second reset transistor M4, and the third reset unit 190 includes a third reset transistor M5. Exemplarily, refer to 6, attach Figure 6 Taking the compensation transistor 160 provided between the driving transistor 150 and the second compensation writing transistor 143 as an example for illustration. Attach Figure 6 Fig. 2 shows the second structural schematic diagram of the pixel driving circuit 100 in the embodiment of the present application. The first end of the second reset transistor M4 is connected to the control end of the driving transistor 150. The second end of the second reset transistor M4 is used to access the second reset voltage. The third end of the third reset transistor M5 is used to access the third reset voltage. The control end of the second reset transistor M4 is used to access the fourth scan signal S1N. The control end of the third reset transistor M5 is used to access the first scan signal SP*.

[0073] Exemplarily, refer to attach Figure 7 attach Figure 7A timing diagram of a first scan signal SP*, a second scan signal SP, a third scan signal S2N, a fourth scan signal S1N, and a light emission control signal Emit is shown. In other embodiments, the timing diagram of the first scan signal SP*, the second scan signal SP, the third scan signal S2N, the fourth scan signal S1N, and the light emission control signal Emit may be other than this, and is not limited thereto.

[0074] In some embodiments, the first reset transistor may be a P-type transistor. The second reset transistor may be an N-type transistor. The third reset transistor may be a P-type transistor. The data writing transistor may be a P-type transistor, and the second compensation writing transistor or the first compensation writing transistor may be an N-type transistor. It is not limited thereto.

[0075] In some embodiments, the present application further provides an array substrate. The array substrate in this embodiment includes a first power supply line, a second power supply line, a third power supply line, and a plurality of pixel driving circuits as described in any of the above embodiments. The plurality of pixel driving circuits are arranged in an array.

[0076] The first power supply line is connected to the pixel driving circuits in the same row or the same column, and one end of the first power supply line is connected to a first power supply; the first power supply is used to supply a first voltage to the plurality of pixel driving circuits via the first power supply line.

[0077] The second power supply line is connected to the pixel driving circuits in the same row or the same column, and one end of the second power supply line is connected to a second power supply; the second power supply is used to supply a second voltage to the plurality of pixel driving circuits via the second power supply line.

[0078] The third power supply line is connected to the pixel driving circuits in the same row or the same column, and one end of the third power supply line is connected to a third power supply; the third power supply is used to supply a third voltage to the plurality of pixel driving circuits via the third power supply line.

[0079] In this embodiment, the array substrate includes a first power supply line, a second power supply line, a third power supply line, and a plurality of pixel driving circuits as described in any of the above embodiments. The plurality of pixel driving circuits are arranged in an array, and the magnitudes of the first voltage and the second voltage received by the pixel driving circuits at different positions may be different. Under the action of the pixel driving circuit in the embodiment of the present application, due to the pixel driving circuit provided in the embodiment of the present application, by providing a compensation transistor on the compensation writing path between the storage capacitor and the light emitting control unit, the compensation transistor transmits the electric charge corresponding to the first voltage or the second voltage to the storage capacitor during the data writing stage under the drive of the first voltage or the second voltage. The light emitting control unit conducts the first voltage to the driving transistor during the light emitting stage, so that the driving transistor outputs a driving current under the action of the driving voltage provided by the storage capacitor based on the stored charge, and the light emitting pixel emits light under the action of the driving current and the second voltage. It can be seen that the magnitude of the driving current in the present application corresponds to the amount of electric charge stored in the storage capacitor, and the amount of electric charge stored in the storage capacitor corresponds to the first voltage or the second voltage. Therefore, the magnitude of the driving current corresponds to the first voltage or the second voltage. Therefore, when the magnitudes of the first voltage or the second voltage received by the proximal and distal ends in the pixel driving circuit are inconsistent, resulting in inconsistent brightness of the corresponding light emitting pixels, the present application can establish a correspondence between the first voltage or the second voltage and the brightness of the light emitting pixels, thereby adaptively adjusting the brightness of the light emitting pixels at the proximal and distal ends within the display surface corresponding to the pixel driving circuit and improving the display brightness uniformity.

[0080] Based on the same inventive concept, in some embodiments, the present application further provides a display panel. The display panel in this embodiment includes the pixel driving circuit as described in any of the above embodiments.

[0081] In some embodiments, the present application further provides a display panel. The display panel in this embodiment includes the array substrate as described in any of the above embodiments.

[0082] Based on the same inventive concept, in some embodiments, the present application further provides a display device. Figure 8 The structural schematic diagram of the display device 20 provided by the embodiment of the present application is as Figure 8 shown. The display device 20 includes the display panel 10 as described in any of the above embodiments. Therefore, the display device 20 also has the beneficial effects of the display panel 10 in the above embodiments. The same parts can be understood with reference to the explanation of the display panel 10 above, and will not be described in detail below.

[0083] The display device 20 provided by the embodiment of the present application can be Figure 8The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: television sets, laptop computers, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, in-vehicle displays, industrial control devices, medical display screens, touch interaction terminals, etc. The embodiments of the present application do not make special limitations in this regard.

[0084] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0085] The above-described embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A pixel driving circuit, characterized in that, Including: A light-emitting control unit, the first end of which is used to connect to a first voltage; A light-emitting pixel, the first end of which is used to connect to a second voltage, and the second end of which is connected to the second end of the light-emitting control unit; A storage capacitor, the first end of which is used to connect to the first voltage; A compensation writing unit, the first end of which is used to connect to a third voltage; A driving transistor, the first end of which is respectively connected to the second end of the compensation writing unit and the third end of the light-emitting control unit, the controlled end of which is connected to the second end of the storage capacitor, and the second end of which is connected to the third end of the compensation writing unit and the fourth end of the light-emitting control unit; A compensation transistor, the first end and the second end of which are arranged on a compensation writing path between the storage capacitor and the light-emitting control unit, the controlled end of which is used to connect to a target voltage, and the compensation transistor, under the drive of the target voltage, transfers a charge amount corresponding to the target voltage to the storage capacitor during a data writing stage; The target voltage is the first voltage or the second voltage; Wherein, the compensation writing unit is used to conduct the third voltage to the compensation transistor during the data writing stage; the light-emitting control unit is used to conduct the first voltage to the driving transistor during a light-emitting stage, so that the driving transistor outputs a driving current under the action of a driving voltage provided by the storage capacitor based on stored charges; The light-emitting pixel is used to emit light under the action of the driving current and the second voltage.

2. The pixel driving circuit according to claim 1, wherein Further including: A first reset unit, the first end of which is used to connect to a first reset voltage, the second end of which is respectively connected to the third end of the light-emitting control unit and the second end of the compensation writing unit, the controlled end of which is used to connect to a first scan signal, and the first reset unit transfers the first reset voltage to the third end of the light-emitting control unit and the second end of the compensation writing unit under the drive of the first scan signal.

3. The pixel driving circuit according to claim 2, wherein The target voltage is the first voltage or the first reset voltage; The type of the compensation transistor includes an N-type transistor.

4. The pixel driving circuit according to claim 1, wherein The target voltage is the second voltage; The type of the compensation transistor includes a P-type transistor.

5. The pixel driving circuit according to claim 1, wherein The compensation writing unit includes: A data writing transistor, the first end of which is used to connect to the third voltage, the second end of which is connected to the first end of the driving transistor, the controlled end of which is used to connect to a second scan signal, and the data writing transistor, during the data writing stage, under the drive of the second scan signal, conducts the third voltage to the compensation writing path through the driving transistor; The first compensation write transistor is disposed on the compensation write path. The first end of the first compensation write transistor is connected to the second end of the driving transistor. The second end of the first compensation write transistor is connected to the first end of the compensation transistor. The control terminal of the first compensation write transistor is configured to receive a third scan signal during the data writing stage. The first compensation write transistor is configured to conduct the third voltage to the compensation transistor under the driving of the third scan signal during the data writing stage, so that the compensation transistor, under the driving of the target voltage, transfers the charge amount corresponding to the target voltage to the storage capacitor based on the third voltage.

6. The pixel driving circuit according to claim 1, wherein, The compensation write unit includes: A data write transistor. The first end of the data write transistor is configured to receive the third voltage. The second end of the data write transistor is connected to the first end of the driving transistor. The control terminal of the data write transistor is configured to receive a second scan signal. The data write transistor conducts the third voltage to the compensation write path through the driving transistor under the driving of the second scan signal during the data writing stage. A second compensation write transistor is disposed on the compensation write path. The first end of the second compensation write transistor is connected to the storage capacitor. The second end of the second compensation write transistor is connected to the first end of the compensation transistor. The control terminal of the second compensation write transistor is configured to receive a third scan signal during the data writing stage. The second compensation write transistor is configured to conduct the charge amount corresponding to the target voltage transmitted by the driving transistor to the storage capacitor under the driving of the third scan signal during the data writing stage.

7. The pixel driving circuit according to any one of claims 1 to 6, characterized in that, The subthreshold swing of the compensation transistor is greater than 0.

5.

8. An array substrate, characterized in that, Comprising: Multiple pixel driving circuits as described in any one of claims 1 to 7; The multiple pixel driving circuits are arranged in an array; A first power supply line is connected to the pixel driving circuits in the same row or the same column. One end of the first power supply line is connected to a first power supply. The first power supply is configured to provide a first voltage to the multiple pixel driving circuits through the first power supply line; A second power supply line is connected to the pixel driving circuits in the same row or the same column. One end of the second power supply line is connected to a second power supply. The second power supply is configured to provide a second voltage to the multiple pixel driving circuits through the second power supply line; A third power supply line is connected to the pixel driving circuits in the same row or the same column. One end of the third power supply line is connected to a third power supply. The third power supply is configured to provide a third voltage to the multiple pixel driving circuits through the third power supply line.

9. A display panel, characterized in that, Comprising the pixel driving circuit as described in any one of claims 1 to 7, or The array substrate as described in claim 8.

10. A display device, characterized in that, Comprising the display panel as described in claim 9.

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