Pixel circuit, driving method thereof and display panel

Abstract

This invention discloses a pixel circuit and its driving method, as well as a display panel. The pixel circuit includes a driving module, a reset module, a data writing module, and a light-emitting module. Both the reset module and the data writing module are connected between the first terminal of the driving module and a data line. The reset module transmits data voltage from the data line to the first terminal of the driving module to reset the first terminal. The data writing module transmits data voltage to the driving module. The reset module and the data writing module transmit the same data voltage from the data line to the driving module in a time-division manner. The driving module outputs a driving current based on the data voltage to drive the light-emitting module to emit light. This embodiment of the invention uses the data voltage to reset the driving module in advance, eliminating the influence of the gate-source voltage difference from the previous frame, thereby mitigating image retention. Furthermore, by shortening the duration of the data voltage writing stage, sufficient data voltage can still be written, which is beneficial for achieving high-frequency display on the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a pixel circuit and its driving method, and a display panel. Background Technology

[0002] With the continuous development of display technology, the application range of display panels is becoming increasingly wide, and people's requirements for display panels are also getting higher and higher. The display quality of a display panel is one of the important indicators for measuring the quality of a display panel.

[0003] Existing display panels typically include multiple pixel circuits and light-emitting devices, with the pixel circuits driving the light-emitting devices to emit light for display. However, existing display panels suffer from image retention, which affects the display quality. Summary of the Invention

[0004] This invention provides a pixel circuit and its driving method, as well as a display panel, to improve the image retention problem and enhance the display effect of the display panel.

[0005] According to one aspect of the present invention, a pixel circuit is provided, comprising: a driving module, a reset module, a data writing module, and a light-emitting module;

[0006] The reset module and the second data module are both connected between the first end of the driving module and the data line. The reset module is used to transmit the data voltage on the data line to the first end of the driving module to reset the first end of the driving module. The data writing module is used to transmit the data voltage to the driving module. The reset module and the data writing module are used to transmit the same data voltage on the data line to the driving module in a time-division manner.

[0007] The driving module is used to output a driving current according to the data voltage to drive the light-emitting module to emit light.

[0008] Optionally, the operation phase of the pixel circuit includes an initialization phase, a data voltage writing phase, and a light emission phase; the reset module is connected to the first scan line, and the reset module is used to transmit the data voltage to the first terminal of the driving module in response to the scan signal on the first scan line during the initialization phase;

[0009] The data writing module is connected to the second scan line. During the data voltage writing phase, the data writing module is used to transmit the data voltage to the control terminal of the drive module in response to the scan signal on the second scan line.

[0010] Optionally, the pixel circuit further includes a storage module and a first initialization module. The storage module is used to store the voltage of the control terminal of the driving module, and the first initialization module is connected between the control terminal of the driving module and the initialization line.

[0011] The first initialization module is also connected to the first scan line; the first initialization module is used to transmit the initialization signal on the initialization line to the control terminal of the drive module in response to the scan signal on the first scan line, so as to initialize the control terminal of the drive module.

[0012] Optionally, the driving module includes a driving transistor, the storage module includes a storage capacitor, the reset module includes a first transistor, the data writing module includes a second transistor, and the first initialization module includes a third transistor.

[0013] The first end of the storage capacitor is electrically connected to the first power line, and the second end of the storage capacitor is electrically connected to the gate of the driving transistor.

[0014] The first terminal of the first transistor is electrically connected to the data line, the second terminal of the first transistor is electrically connected to the first terminal of the driving transistor, and the gate of the first transistor is electrically connected to the first scan line.

[0015] The first terminal of the second transistor is electrically connected to the data line, the second terminal of the second transistor is electrically connected to the first terminal of the driving transistor, and the gate of the second transistor is electrically connected to the second scan line.

[0016] The first terminal of the third transistor is electrically connected to the initialization line, the second terminal of the third transistor is electrically connected to the gate of the driving transistor, and the gate of the third transistor is electrically connected to the first scan line.

[0017] The second terminal of the driving transistor is electrically connected to the first terminal of the light-emitting module, and the second terminal of the light-emitting module is electrically connected to the second power line.

[0018] Optionally, the pixel circuit further includes a first light-emitting control module and a second light-emitting control module;

[0019] The first light-emitting control module is connected between the first power line and the first end of the driving module, the second light-emitting control module is connected between the second end of the driving module and the first end of the light-emitting module, the second end of the light-emitting module is connected to the second power line, and both the first light-emitting control module and the second light-emitting module are also connected to the light-emitting control signal line;

[0020] Preferably, the first light-emitting control module includes a fourth transistor, the second light-emitting control module includes a fifth transistor, the first terminal of the fourth transistor is electrically connected to the first power line, the second terminal of the fourth transistor is electrically connected to the first terminal of the driving module, and the gate of the fourth transistor is electrically connected to the light-emitting control signal line.

[0021] The first terminal of the fifth transistor is electrically connected to the second terminal of the driving module, the second terminal of the fifth transistor is electrically connected to the first terminal of the light-emitting module, and the gate of the fifth transistor is electrically connected to the light-emitting control signal line.

[0022] Optionally, the pixel circuit further includes a second initialization module, which is connected between the first end of the light-emitting module and the initialization line, and the control end of the second initialization module is also connected to the first scan line;

[0023] The second initialization module is used to transmit the initialization signal on the initialization line to the first end of the light-emitting module in response to the scanning signal on the first scan line, so as to initialize the first end of the light-emitting module;

[0024] Preferably, the second initialization module includes a sixth transistor, the first terminal of the sixth transistor is electrically connected to the initialization line, the second terminal of the sixth transistor is electrically connected to the first terminal of the light-emitting module, and the gate of the sixth transistor is electrically connected to the first scan line.

[0025] Optionally, the pixel circuit further includes a compensation module, which is connected between the control terminal of the driving module and the second terminal of the driving module. The control terminal of the compensation module is also connected to the second scan line. The compensation module is used to perform threshold compensation on the driving module and is also used to write the data voltage to the control terminal of the driving module during the data voltage writing stage.

[0026] Optionally, the compensation module includes a seventh transistor;

[0027] The first terminal of the seventh transistor is electrically connected to the control terminal of the driving module, the second terminal of the seventh transistor is electrically connected to the second terminal of the driving module, and the gate of the seventh transistor is electrically connected to the second scan line.

[0028] According to another aspect of the present invention, a driving method for a pixel circuit is provided, the pixel circuit including a driving module, a storage module, a reset module, a data writing module and a light-emitting module, the working stages of the pixel circuit including an initialization stage, a data voltage writing stage and a light-emitting stage;

[0029] During the initialization phase, the reset module transmits data voltage to the first terminal of the drive module to reset the first terminal of the drive module;

[0030] During the data voltage writing stage, the data writing module transmits the data voltage to the control terminal of the drive module to write the data voltage to the drive module.

[0031] During the light-emitting phase, the driving module outputs a driving current based on the data voltage to drive the light-emitting module to emit light.

[0032] According to another aspect of the present invention, a display panel is provided, including the pixel circuit described in any of the preceding claims.

[0033] This invention provides a pixel circuit and its driving method, as well as a display panel. The pixel circuit includes a driving module, a reset module, a data writing module, and a light-emitting module. Both the reset module and the data writing module are connected between the driving module and the data line. The reset module and the data writing module are used to transmit the same data voltage on the data line to the driving module in a time-division multiplexing manner. The driving module outputs a driving current based on the data voltage to drive the light-emitting module to emit light. The reset module transmits the data voltage on the data line to the first terminal of the driving module to reset the first terminal of the driving module. This means that the driving module is reset in advance using the data voltage, so that the gate-source voltage difference of the driving transistors included in the driving module reaches the value required for the current frame within a short time, eliminating the influence of the gate-source voltage difference from the previous frame, thereby alleviating the ghosting phenomenon and effectively improving display uniformity. Furthermore, because the data voltage is written to the second terminal of the driving module (the terminal where the driving module connects to the light-emitting module) in advance, sufficient data voltage writing can still be ensured even with a shortened data voltage writing stage, which is beneficial for achieving high-frequency display on the display panel.

[0034] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the ghosting phenomenon in existing display panels;

[0037] Figure 2This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0041] Figure 6 This is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0043] Figure 8 This is a flowchart of a pixel circuit driving method provided in an embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] As described in the background section, existing display panels suffer from image retention issues. The image retention problem in display panels will be explained below. Figure 1 This is a schematic diagram illustrating the image retention phenomenon on existing display panels. See also... Figure 1 During the performance testing of the display panel, the panel was set to display a black and white checkerboard pattern for a period of time, then switch to a low grayscale image. Specifically, the previous frame displayed a black and white image (e.g., a black area at grayscale 0 and a white area at grayscale 255) and maintained this for a preset time (e.g., 20 seconds). Then, in the current frame, it switched to a mid-grayscale image (e.g., grayscale 64). Due to the ghosting effect of the black and white image, the brightness of the original black areas was higher than that of the original white areas in the final displayed image. This resulted in the original black areas appearing darker than the original white areas, indicating ghosting and affecting the display effect.

[0048] The inventors discovered that the problem arises as follows: Existing display panels typically include multiple pixel circuits. Each pixel circuit includes a driving transistor that drives a light-emitting device to emit light. The driving transistor controls the brightness of the light-emitting device by controlling the driving current flowing through it. The magnitude of the driving current generated by the driving transistor is related to the gate-source voltage difference of the transistor. When the pixel circuit performs grayscale switching, due to the hysteresis effect of the driving transistor, the gate-source voltage difference remains at the previous potential for a short period, resulting in image ghosting.

[0049] To address the above problems, embodiments of the present invention provide a pixel circuit. Figure 2 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention. (Reference) Figure 2 The pixel circuit includes: a driving module 10, a reset module 12, a data writing module 13, and a light-emitting module 14;

[0050] The reset module 12 and the data writing module 13 are both connected between the first end of the drive module 10 and the data line. The reset module 12 is used to transmit the data voltage on the data line Vdata to the first end of the drive module 10 to reset the first end of the drive module 10. The data writing module 13 is used to transmit the data voltage to the drive module 10, and the reset module 12 and the data writing module 13 are used to transmit the same data voltage on the data line Vdata to the drive module 10 in a time-division manner.

[0051] The driving module 10 is used to output a driving current according to the data voltage to drive the light-emitting module 14 to emit light.

[0052] Optionally, the pixel circuit further includes a storage module 11 for storing the voltage of the control terminal of the driving module 10. The pixel circuit also includes at least one light-emitting control module for controlling whether the driving module 10 is connected to at least one of the first power line Vdd or the second power line Vss. In this embodiment, the pixel circuit is exemplarily shown to include a first light-emitting control module 17 connected between the first power line Vdd and the first end of the driving module 10, and a second light-emitting control module 18 connected between the second end of the driving module 10 and the first end of the light-emitting module 14. The second end of the light-emitting module 14 is electrically connected to the second power line Vss. During the light-emitting phase, a path is formed between the first power line Vdd, the driving module 10, the light-emitting module 14, and the second power line Vss. The driving module 10 generates a driving current according to the data voltage, driving the light-emitting module 14 to emit light.

[0053] For example, both the reset module 12 and the data writing module 13 can be connected between the first terminal of the driving module 10 and the data line Vdata. Optionally, the pixel circuit further includes a compensation module 15, which is connected between the control terminal and the second terminal of the driving module 10. In this embodiment, the light-emitting module 14 can be an organic light-emitting diode (OLED).

[0054] The reset module 12 and the data writing module 13 are used to transmit the same data voltage on the data line Vdata to the driving module 10 in a time-division manner. The reset module 12 and the data writing module 13 can transmit the data voltage to the driving module 10 at different stages within a frame of the pixel circuit, making the data voltage writing more thorough. For example, in this embodiment, the pixel circuit's working phase during the display of one frame may include at least a data voltage writing phase. The reset module 12 can transmit the data voltage to the first and second terminals of the driving module 10 before the data voltage writing phase (at this time, the driving module 10 is already turned on). After entering the data voltage writing phase, the data writing module 13 writes the data voltage to the control terminal of the driving module 10. The driving module 10 includes a driving transistor. Writing the data voltage to the first terminal of the driving module 10 before the data voltage writing phase allows the driving module 10 to be reset in advance using the data voltage, so that the gate-source voltage difference of the driving transistor reaches the value required for the current frame within a short time, eliminating the influence of the gate-source voltage difference of the previous frame, thereby alleviating the ghosting phenomenon and effectively improving display uniformity. Furthermore, in this embodiment, since the data voltage has been pre-written to the second terminal of the driving module 10, when the data voltage writing stage begins, the voltage at the second terminal of the driving module 10 is directly transmitted to the control terminal of the driving module 10 via the conducting compensation module 15, ensuring more complete data voltage writing within a limited time. Because the data voltage is pre-written to the second terminal of the driving module 10, even with a shortened data voltage writing stage, sufficient data voltage writing can still be guaranteed, which is beneficial for achieving high-frequency display on the display panel.

[0055] In this embodiment, both the reset module 12 and the data writing module 13 are used to transmit data voltage to the driving module 10. The driving module 10 can be reset in advance using the data voltage, allowing the gate-source voltage difference of the driving transistors included in the driving module 10 to reach the value required for the current frame within a short time. This eliminates the influence of the gate-source voltage difference from the previous frame, thereby mitigating ghosting and effectively improving display uniformity. Furthermore, because the data voltage is written to the second terminal of the driving module 10 in advance, sufficient data voltage writing can still be ensured even with a shortened data voltage writing phase, which is beneficial for achieving high-frequency display on the display panel.

[0056] Figure 3 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 3 Optionally, the working stages of the pixel circuit include an initialization stage, a data voltage writing stage, and a light emission stage; the reset module 12 is connected to the first scan line S1, and the reset module 12 is used to transmit the data voltage to the first terminal of the drive module 10 in response to the scan signal on the first scan line S1 during the initialization stage.

[0057] The data writing module 13 is connected to the second scan line S2. During the data voltage writing stage, the data writing module 13 transmits the data voltage to the control terminal of the drive module 10 in response to the scan signal on the second scan line S2.

[0058] The reset module 12 responds to the scanning signal on the first scan line S1 to turn on or off, and the data writing module 13 responds to the scanning signal on the second scan line S2 to turn on or off. During the initialization phase, the reset module 12 responds to the signal on the first scan line S1 to turn on, transmitting data voltage to the first and second terminals of the drive module 10 (because the drive module 10 may be on at times during the initialization phase, the data voltage can also be transmitted to the second terminal). Writing data voltage to the drive module 10 during the initialization phase allows for early reset of the drive module 10, ensuring that the gate-source voltage difference of the drive transistors included in the drive module 10 reaches the value required for the current frame within a short time, eliminating the influence of the gate-source voltage difference from the previous frame, thereby mitigating ghosting and effectively improving display uniformity. During the data voltage writing phase, the data writing module 13 responds to the signal on the second scan line S2 to turn on, transmitting data voltage to the control terminal of the drive module 10. During the data voltage writing phase, the voltage at the second terminal of the drive module 10 is directly transmitted to the control terminal of the drive module 10 via the conducting compensation module 15, ensuring more complete data voltage writing within a limited time. Because the data voltage is written to the second terminal of the drive module 10 in advance, sufficient data voltage writing can still be guaranteed even with a shortened data voltage writing phase, which is beneficial for achieving high-frequency display on the display panel.

[0059] Continue to refer to Figure 3 Optionally, the pixel circuit also includes a first initialization module 16, which is connected between the control terminal of the driving module 10 and the initialization line Vref.

[0060] The first initialization module 16 is also connected to the first scan line S1; the first initialization module 16 is used to transmit the initialization signal on the initialization line Vref to the control terminal of the drive module 10 in response to the scan signal on the first scan line S1, so as to initialize the control terminal of the drive module 10.

[0061] During the initialization phase, the first initialization module 16 responds to the scanning signal on the first scan line S1 by writing the initialization signal on the initialization line Vref to the control terminal of the driving module 10, thus completing the initialization of the control terminal of the driving module 10. Simultaneously, the first initialization module 16 writes the voltage on the initialization line Vref to the control terminal of the driving module 10, enabling the driving module 10 to conduct, facilitating the subsequent writing of data voltage to the driving module 10. In this embodiment, the first initialization module 16 and the reset module 12 are connected to the same scan line (first scan line S1). This eliminates the need to change the driving timing of the pixel circuit; only a reset module 12 is needed to transmit the data voltage in advance. This simplifies the structure of the scanning circuit that provides the scanning signal to the pixel circuit, and simplifies the overall structural design of the display panel when the pixel circuit is applied.

[0062] Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 4 Optionally, the pixel circuit also includes a first light-emitting control module 17 and a second light-emitting control module 18;

[0063] The first light-emitting control module 17 is connected between the first power line Vdd and the first end of the driver module 10. The second light-emitting control module 18 is connected between the second end of the driver module 10 and the first end of the light-emitting module 14. The second end of the light-emitting module 14 is connected to the second power line Vss. The first light-emitting control module 17 and the second light-emitting control module 18 are also connected to the light-emitting control signal line EM.

[0064] The first light-emitting control module 17 is used to transmit the first power supply voltage provided by the first power supply line Vdd to the first terminal of the driving module 10 in response to the signal on the light-emitting control signal line EM. The second light-emitting control module 18 is used to transmit the driving current generated by the driving module 10 to the light-emitting module 14 in response to the signal on the light-emitting control signal line EM. The first light-emitting control module 17 and the second light-emitting control module 18 are turned off during the non-light-emitting stage, so that the driving module 10 is not connected to the first power supply line Vdd and the second power supply line Vss, thus preventing the light-emitting module 14 from emitting light accidentally during the non-light-emitting stage. The first light-emitting control module 17 and the second light-emitting control module 18 are turned on during the light-emitting stage, so that the driving module 10 is connected to the first power supply line Vdd and the second power supply line Vss, thereby forming a path between the first power supply line Vdd, the driving module 10, and the second power supply line Vss, so that the light-emitting module 14 emits light.

[0065] Continue to refer to Figure 4 Optionally, the pixel circuit also includes a second initialization module 19, which is connected between the first end of the light-emitting module 14 and the initialization line Vref. The control end of the second initialization module 19 is also connected to the first scan line S1.

[0066] The second initialization module 19 is used to transmit the initialization signal on the initialization line Vref to the first end of the light-emitting module 14 in response to the scanning signal on the first scan line S1, so as to initialize the first end of the light-emitting module 14.

[0067] The second initialization module 19 responds to the scanning signal on the first scan line S1 to turn on or off. When the second initialization module 19 is turned on, it transmits the initialization signal on the initialization line Vref to the first end of the light-emitting module 14 to complete the initialization of the first end of the light-emitting module 14 and avoid the influence of the residual charge of the previous frame on the light-emitting brightness of the current frame.

[0068] Continue to refer to Figure 4 Optionally, the pixel circuit also includes a compensation module 15, which is connected between the control terminal of the driving module 10 and the second terminal of the driving module 10. The control terminal of the compensation module 15 is also connected to the second scan line S2. The compensation module 15 is used to perform threshold compensation on the driving module 10 and is also used to write the data voltage to the control terminal of the driving module 10 during the data voltage writing stage.

[0069] Based on the above embodiments, Figure 5 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 5 Optionally, the pixel circuit includes a driving module 10, a storage module 11, a reset module 12, a data writing module 13, a light-emitting module 14, a compensation module 15, a first initialization module 16, a first light-emitting control module 17, a second light-emitting control module 18, and a second initialization module 19. The connection relationship between the above modules is as described in the above embodiment, and will not be repeated here.

[0070] Figure 6 This is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention. Figure 6 The driving timing shown can be applied to Figure 5 The pixel circuit shown. (Reference) Figure 5 and Figure 6 The working process of the pixel circuit within one frame includes the initialization stage t11, the data voltage writing and threshold voltage compensation stage t12, and the light emission stage t13.

[0071] During initialization phase t11, the first initialization module 16, the second initialization module 19, and the reset module 12 all respond to the scan signal on the first scan line S1 and are turned on. For example, all three modules respond to a low level to turn on and a high level to turn off. The first light-emitting control module 17 and the second light-emitting control module 18 respond to the signal on the light-emitting control signal line EM and are turned off. For example, both modules respond to a low level to turn on and a high level to turn off. The data writing module 13 and the compensation module 15 respond to the scan signal on the second scan line S2 and are turned off. For example, both modules respond to a low level to turn on and a high level to turn off. After the first initialization module 16 is turned on, it transmits the initialization signal on the initialization line Vref to the control terminal of the driver module 10. After the second initialization module 19 is turned on, it transmits the initialization signal on the initialization line Vref to the first terminal of the light-emitting module 14. That is, in the initialization stage t11, the first initialization module 16 initializes the control terminal of the driver module 10, and the second initialization module 19 initializes the first terminal of the light-emitting module 14, which helps to improve the uniformity of the display. After the reset module 12 is turned on, it transmits the data voltage to the first terminal of the driver module 10. By writing the data voltage to the first terminal of the driver module 10 in advance, the driver module 10 can be reset in advance using the data voltage, so that the gate-source voltage difference of the driving transistors included in the driver module 10 reaches the value required by the current frame in a short time, eliminating the influence of the gate-source voltage difference of the previous frame, thereby alleviating the ghosting phenomenon and effectively improving the uniformity of the display.

[0072] During the data voltage writing and threshold voltage compensation phase t12, the first initialization module 16, the second initialization module 19, and the reset module 12 turn off in response to the scan signal on the first scan line S1. The first light emission control module 17 and the second light emission control module 18 turn off in response to the signal on the light emission control signal line EM. The data writing module 13 and the compensation module 15 turn on in response to the scan signal on the second scan line S2. After the data writing module 13 and the compensation module 15 turn on, they write the data voltage to the control terminal of the drive module 10. At the same time, the compensation module 15 can compensate for the threshold voltage of the drive module 10, so that the voltage at the control terminal of the drive module 10 is correlated with the threshold voltage. Because the data voltage is written to the first and second terminals of the drive module 10 through the turned-on reset module 12 during the initialization phase t11, the voltage at the second terminal of the drive module 10 is directly transmitted to the control terminal of the drive module 10 through the turned-on compensation module 15 during the data voltage writing and threshold voltage compensation phase, so that the data voltage is written more fully within a limited time. Because the data voltage is written to the second terminal of the driver module 10 in advance, the data voltage can still be fully written even with a shortened data voltage writing stage, which is beneficial for achieving high-frequency display on the display panel.

[0073] During the light-emitting stage t13, the first initialization module 16, the second initialization module 19, and the reset module 12 turn off in response to the scan signal on the first scan line S1. The data writing module 13 and the compensation module 15 turn off in response to the scan signal on the second scan line S2. The first light-emitting control module 17 and the second light-emitting control module 18 turn on in response to the signal on the light-emitting control signal line EM. A path is formed between the first power line Vdd, the first light-emitting control module 17, the driving module 10, the second light-emitting control module 18, the light-emitting module 14, and the second power line Vss. The driving module 10 generates a driving current according to the data voltage to drive the light-emitting module 14 to emit light.

[0074] Figure 7 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 5 and Figure 7 Optionally, the driving module 10 includes a driving transistor T0, the storage module 11 includes a storage capacitor C1, the reset module 12 includes a first transistor T1, the data writing module 13 includes a second transistor T2, and the first initialization module 16 includes a third transistor T3.

[0075] The first terminal of the storage capacitor C1 is electrically connected to the first power supply line Vdd, and the second terminal of the storage capacitor C1 is electrically connected to the gate of the driving transistor T0.

[0076] The first terminal of the first transistor T1 is electrically connected to the data line Vdata, the second terminal of the first transistor T1 is electrically connected to the first terminal of the driving transistor T0, and the gate of the first transistor T1 is electrically connected to the first scan line S1.

[0077] The first terminal of the second transistor T2 is electrically connected to the data line Vdata, the second terminal of the second transistor T2 is electrically connected to the first terminal of the driving transistor T0, and the gate of the second transistor T2 is electrically connected to the second scan line S2.

[0078] The first terminal of the third transistor T3 is electrically connected to the initialization line Vref, the second terminal of the third transistor T3 is electrically connected to the gate of the driving transistor T0, and the gate of the third transistor T3 is electrically connected to the first scan line S1.

[0079] The second terminal of the driving transistor T0 is electrically connected to the first terminal of the light-emitting module 14, and the second terminal of the light-emitting module 14 is electrically connected to the second power line Vss.

[0080] Specifically, in this embodiment, the third transistor T3 can be a dual-gate transistor, comprising two sub-transistors: a first sub-transistor T3-1 and a second sub-transistor T3-2. The first terminal of the first sub-transistor T3-1 is electrically connected to the initialization line Vref, and the second terminal of the first sub-transistor T3-1 is electrically connected to the first terminal of the second sub-transistor T3-2. The second terminal of the second sub-transistor T3-2 is electrically connected to the gate of the driving transistor T0. The gates of both the first sub-transistor T3-1 and the second sub-transistor T3-2 are electrically connected to the first scan line S1. By configuring the third transistor T3 as a dual-gate transistor, the leakage current of the third transistor T3 can be reduced after it is turned off, thereby maintaining the stability of the gate voltage of the driving transistor T0 and improving the display effect.

[0081] Continue to refer to Figure 5 and Figure 7 Optionally, the first light-emitting control module 17 includes a fourth transistor T4, the second light-emitting control module 18 includes a fifth transistor T5, the second initialization module 19 includes a sixth transistor T6, and the compensation module 15 includes a seventh transistor T7.

[0082] The first terminal of the fourth transistor T4 is electrically connected to the first power supply line Vdd, the second terminal of the fourth transistor T4 is electrically connected to the first terminal of the driving module 10, and the gate of the fourth transistor T4 is electrically connected to the light emission control signal line EM.

[0083] The first terminal of the fifth transistor T5 is electrically connected to the second terminal of the driving module 10, the second terminal of the fifth transistor T5 is electrically connected to the first terminal of the light-emitting module 14, and the gate of the fifth transistor T5 is electrically connected to the light-emitting control signal line EM.

[0084] The first terminal of the sixth transistor T6 is electrically connected to the initialization line Vref, the second terminal of the sixth transistor T6 is electrically connected to the first terminal of the light-emitting module 14, and the gate of the sixth transistor T6 is electrically connected to the first scan line S1.

[0085] The first terminal of the seventh transistor T7 is electrically connected to the control terminal of the drive module 10, the second terminal of the seventh transistor T7 is electrically connected to the second terminal of the drive module 10, and the gate of the seventh transistor T7 is electrically connected to the second scan line S2.

[0086] The seventh transistor T7 can be a dual-gate transistor. The seventh transistor T7 includes a third sub-transistor T7-1 and a fourth sub-transistor T7-2. The first terminal of the third sub-transistor T7-1 is electrically connected to the second terminal of the driving module 10, the second terminal of the third sub-transistor T7-1 is electrically connected to the first terminal of the fourth sub-transistor T7-2, and the second terminal of the fourth sub-transistor T7-2 is electrically connected to the control terminal of the driving module 10. The gates of both the third sub-transistor T7-1 and the fourth sub-transistor T7-2 are electrically connected to the second scan line S2. By setting the seventh transistor T7 as a dual-gate transistor, the leakage current of the seventh transistor T7 can be reduced after it is turned off, thereby maintaining the stability of the gate voltage of the driving transistor T0.

[0087] Figure 6 The driving timing diagram shown is also applicable to Figure 7 In the pixel circuit shown in this embodiment, the driving transistor T0, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, and the seventh transistor T7 are all P-type transistors. In other embodiments, the above transistors may also be N-type transistors.

[0088] During initialization phase t11, the scan signal on the second scan line S2 is at a high level, controlling the second transistor T2 and the seventh transistor T7 to turn off. The signal on the light emission control signal line EM is at a high level, controlling the fourth transistor T4 and the fifth transistor T5 to turn off. The scan signal on the first scan line S1 is at a low level, controlling the third transistor T3, the sixth transistor T6, and the first transistor T1 to turn on. The turned-on third transistor T3 transmits the initialization signal on the initialization line Vref to the gate of the driving transistor T0, completing the initialization of the driving transistor T0. The turned-on sixth transistor T6 transmits the initialization signal on the initialization line Vref to the first terminal of the light emission module 14, completing the initialization of the light emission module 14. During the initialization phase t11, the driving transistor T0 also has a moment of conduction. The data voltage is written to the first and second terminals of the driving transistor T0 through the first conducting transistor T1 and the driving transistor T0. By writing the data voltage to the first and second terminals of the driving transistor T0 in advance, the driving transistor T0 is reset in advance, so that the gate-source voltage difference of the driving transistor T0 reaches the value required by the current frame in a short time, eliminating the influence of the gate-source voltage difference of the previous frame, thereby alleviating the ghosting phenomenon and effectively improving the uniformity of display.

[0089] During the data voltage writing and threshold voltage compensation stage t12, the scan signal on the first scan line S1 is at a high level, controlling the third transistor T3, the sixth transistor T6, and the first transistor T1 to turn off. The signal on the light emission control signal line EM is at a high level, controlling the fourth transistor T4 and the fifth transistor T5 to turn off. The scan signal on the second scan line S2 is at a low level, controlling the second transistor T2 and the seventh transistor T7 to turn on. The turned-on second transistor T2 and seventh transistor T7 transmit the data voltage to the gate of the driving transistor T0. Simultaneously, the seventh transistor T7 compensates for the threshold voltage of the driving transistor T0, making the gate voltage of the driving transistor T0 correlated with the threshold voltage, which helps improve the uniformity of the display. During the data voltage writing and threshold voltage compensation stage t12, the voltage at the second terminal of the driving transistor T0 is directly transmitted to the gate of the driving transistor T0 via the turned-on seventh transistor T7, allowing for more complete data voltage writing within a limited time. Because the data voltage is written to the second terminal of the driving transistor T0 in advance, even with a shortened duration of the data voltage writing and threshold voltage compensation phase t12, the data voltage can still be fully written, which is beneficial for achieving high-frequency display on the display panel.

[0090] During the light-emitting stage t13, the scan signal on the first scan line S1 is at a high level, controlling the third transistor T3, the sixth transistor T6, and the first transistor T1 to turn off. The scan signal on the second scan line S2 is at a high level, controlling the second transistor T2 and the seventh transistor T7 to turn off. The signal on the light-emitting control signal line EM is at a low level, controlling the fourth transistor T4 and the fifth transistor T5 to turn on. The turned-on fourth transistor T4 transmits the voltage on the first power supply line Vdd to the first terminal of the driving transistor T0. The driving transistor T0 generates a driving current based on the voltage between its gate and the first terminal, driving the light-emitting module 14 to emit light.

[0091] Figure 7 This is merely an exemplary circuit provided in this embodiment. Those skilled in the art will understand that any pixel circuit capable of pre-writing data voltage to the driving module conforms to the concept of this invention. Except... Figure 7 In addition to the pixel circuit shown, any circuit that incorporates another transistor in parallel between the data line and the driving transistor to pre-write the data voltage into the driving transistor also conforms to the inventive concept.

[0092] This invention also provides a method for driving a pixel circuit. Figure 8 This is a flowchart of a pixel circuit driving method provided in this embodiment, referencing... Figure 2 and 8 The pixel circuit includes a driving module 10, a reset module 12, a data writing module 13, and a light-emitting module 14. The working stages of the pixel circuit include an initialization stage, a data voltage writing stage, and a light-emitting stage.

[0093] S101: During the initialization phase, the reset module transmits the data voltage to the first terminal of the drive module to reset the first terminal of the drive module.

[0094] During the initialization phase, the reset module 12 is turned on and the data writing module 13 is turned off. The data voltage is transmitted to the first and second terminals of the drive module 10 through the turned-on reset module 12. The drive module 10 is reset in advance using the data voltage so that the gate-source voltage difference of the drive transistor reaches the value required for the current frame in a short time, eliminating the influence of the gate-source voltage difference of the previous frame, thereby alleviating the ghosting phenomenon and effectively improving the uniformity of display.

[0095] S102: During the data voltage writing stage, the data writing module transmits the data voltage to the control terminal of the drive module to write the data voltage to the drive module.

[0096] During the data voltage writing phase, the reset module 12 is turned off and the data writing module 13 is turned on. The data voltage is written to the control terminal of the drive module 10 via the turned-on data writing module 13, thus realizing the data voltage writing. Because the data voltage has already been written to the second terminal of the drive module 10 during the initialization phase, when the data voltage writing phase begins, the voltage at the second terminal of the drive module 10 is directly transmitted to the control terminal of the drive module 10, allowing for more complete data voltage writing within a limited time. Because the data voltage is written to the second terminal of the drive module 10 in advance, even with a shortened data voltage writing phase, sufficient data voltage writing can still be guaranteed, which is beneficial for achieving high-frequency display on the display panel.

[0097] S103: During the light-emitting stage, the driving module outputs a driving current based on the data voltage to drive the light-emitting module to emit light.

[0098] During the light-emitting phase, the reset module 12 and the data writing module 13 are turned off, and the drive module outputs a drive current according to the data voltage to drive the light-emitting module to emit light.

[0099] The driving method for pixel circuits has the same beneficial effects as pixel circuits, and will not be described again in this embodiment.

[0100] The present invention also provides a display panel, including the pixel circuit of any of the above embodiments. The beneficial effects of the display panel are the same as those of the pixel circuit, and will not be described again in this embodiment.

[0101] This invention also provides a display device. Figure 9 This is a schematic diagram of the structure of a display device provided in this embodiment, with reference to... Figure 9 The display device 01 includes the display panel 02 described above. The display device 01 can be... Figure 9 The mobile phone shown can also be a computer, television, smart wearable display device, etc., and the embodiments of the present invention do not make any special limitations on this.

[0102] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A pixel circuit, characterized in that, include: The module consists of a driver module, a reset module, a data writing module, and a light-emitting module. The reset module and the data writing module are both connected between the first end of the driver module and the data line. The reset module is used to transmit the data voltage on the data line to the first end of the driver module to reset the first end of the driver module. The data writing module is used to transmit the data voltage to the driver module. The reset module and the data writing module are used to transmit the same data voltage on the data line to the driver module in a time-division manner. The driving module is used to output a driving current according to the data voltage to drive the light-emitting module to emit light; The operation phases of the pixel circuit include an initialization phase, a data voltage writing phase, and a light emission phase; the reset module is connected to the first scan line, and the reset module is used to transmit the data voltage to the first and second terminals of the driving module in response to the scan signal on the first scan line during the initialization phase; The pixel circuit further includes a first initialization module, which is connected between the control terminal and the initialization line of the driving module. The first initialization module includes a third transistor, which is a dual-gate transistor. The third transistor includes a first sub-transistor and a second sub-transistor. The first terminal of the first sub-transistor is electrically connected to the initialization line. The second terminal of the first sub-transistor is electrically connected to the first terminal of the second sub-transistor, and the second terminal of the second sub-transistor is electrically connected to the control terminal of the driving module.

2. The pixel circuit according to claim 1, characterized in that, The data writing module is connected to the second scan line. During the data voltage writing phase, the data writing module is used to transmit the data voltage to the control terminal of the drive module in response to the scan signal on the second scan line.

3. The pixel circuit according to claim 2, characterized in that, It also includes a storage module for storing the voltage of the control terminal of the drive module, and the first initialization module is also connected to the first scan line; the first initialization module is used to transmit the initialization signal on the initialization line to the control terminal of the drive module in response to the scan signal on the first scan line, so as to initialize the control terminal of the drive module.

4. The pixel circuit according to claim 3, characterized in that, The driving module includes a driving transistor, the storage module includes a storage capacitor, the reset module includes a first transistor, and the data writing module includes a second transistor. The first end of the storage capacitor is electrically connected to the first power line, and the second end of the storage capacitor is electrically connected to the gate of the driving transistor. The first terminal of the first transistor is electrically connected to the data line, the second terminal of the first transistor is electrically connected to the first terminal of the driving transistor, and the gate of the first transistor is electrically connected to the first scan line. The first terminal of the second transistor is electrically connected to the data line, the second terminal of the second transistor is electrically connected to the first terminal of the driving transistor, and the gate of the second transistor is electrically connected to the second scan line. The second terminal of the driving transistor is electrically connected to the first terminal of the light-emitting module, and the second terminal of the light-emitting module is electrically connected to the second power line.

5. The pixel circuit according to claim 2, characterized in that, It also includes a first light-emitting control module and a second light-emitting control module; The first light-emitting control module is connected between the first power line and the first end of the driving module, the second light-emitting control module is connected between the second end of the driving module and the first end of the light-emitting module, the second end of the light-emitting module is connected to the second power line, and both the first light-emitting control module and the second light-emitting control module are also connected to the light-emitting control signal line.

6. The pixel circuit according to claim 5, characterized in that, The first light-emitting control module includes a fourth transistor, and the second light-emitting control module includes a fifth transistor. The first terminal of the fourth transistor is electrically connected to the first power line, the second terminal of the fourth transistor is electrically connected to the first terminal of the driving module, and the gate of the fourth transistor is electrically connected to the light-emitting control signal line. The first terminal of the fifth transistor is electrically connected to the second terminal of the driving module, the second terminal of the fifth transistor is electrically connected to the first terminal of the light-emitting module, and the gate of the fifth transistor is electrically connected to the light-emitting control signal line.

7. The pixel circuit according to claim 5, characterized in that, It also includes a second initialization module, which is connected between the first end of the light-emitting module and the initialization line, and the control end of the second initialization module is also connected to the first scan line; The second initialization module is used to transmit the initialization signal on the initialization line to the first end of the light-emitting module in response to the scanning signal on the first scan line, so as to initialize the first end of the light-emitting module.

8. The pixel circuit according to claim 7, characterized in that, The second initialization module includes a sixth transistor, the first terminal of which is electrically connected to the initialization line, the second terminal of which is electrically connected to the first terminal of the light-emitting module, and the gate of which is electrically connected to the first scan line.

9. The pixel circuit according to claim 7, characterized in that, It also includes a compensation module, which is connected between the control terminal of the driving module and the second terminal of the driving module. The control terminal of the compensation module is also connected to the second scan line. The compensation module is used to perform threshold compensation on the driving module and is also used to write the data voltage to the control terminal of the driving module during the data voltage writing stage.

10. The pixel circuit according to claim 9, characterized in that, The compensation module includes a seventh transistor; The first terminal of the seventh transistor is electrically connected to the control terminal of the driving module, the second terminal of the seventh transistor is electrically connected to the second terminal of the driving module, and the gate of the seventh transistor is electrically connected to the second scan line.

11. A driving method for a pixel circuit, characterized in that, The pixel circuit includes a driving module, a reset module, a data writing module, and a light-emitting module. The working stages of the pixel circuit include an initialization stage, a data voltage writing stage, and a light-emitting stage. During the initialization phase, the reset module transmits data voltage to the first and second terminals of the drive module to reset the first terminal of the drive module. During the data voltage writing stage, the data writing module transmits the data voltage to the control terminal of the drive module to write the data voltage to the drive module. During the light-emitting phase, the driving module outputs a driving current according to the data voltage to drive the light-emitting module to emit light; The pixel circuit further includes a first initialization module, which is connected between the control terminal and the initialization line of the driving module. The first initialization module includes a third transistor, which is a dual-gate transistor. The third transistor includes a first sub-transistor and a second sub-transistor. The first terminal of the first sub-transistor is electrically connected to the initialization line. The second terminal of the first sub-transistor is electrically connected to the first terminal of the second sub-transistor, and the second terminal of the second sub-transistor is electrically connected to the control terminal of the driving module.

12. A display panel, characterized in that, Includes the pixel circuit according to any one of claims 1-10.

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