Pixel circuit and driving method thereof, and display panel

Abstract

The present invention discloses a pixel circuit, a driving method thereof, and a display panel. The pixel circuit includes: a data writing module, a driving module, a storage module, a light-emitting module, a first initialization module, and an initialization compensation module; the data writing module is connected between the driving module and the data line; the storage module is connected to the control end of the driving module; the driving module is connected to the first end of the light-emitting module, and the driving module is used to generate a driving current in the light-emitting stage to drive the light-emitting module to emit light; the first initialization module is connected between the initialization signal line and the first end of the light-emitting module; the initialization compensation module is connected between the control end of the driving module and the first end of the light-emitting module, and the initialization compensation module is used to write the voltage of the control end of the driving module stored in the storage module to the first end of the light-emitting module before the data writing stage. The technical solution of the embodiment of the present invention provides a display effect of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a pixel circuit and a driving method thereof, and a display panel. Background Art

[0002] With the rapid development of display technology, people have increasingly higher requirements on the display performance of display panels.

[0003] When the display panel switches display images, for example, when switching from a black image to a low-brightness image, the brightness difference between the first frame and the subsequent frames of the low-brightness image is large, which affects the display effect of the display panel. Summary of the Invention

[0004] The present invention provides a pixel circuit and a driving method thereof, and a display panel, so as to improve the display effect of the display panel.

[0005] According to one aspect of the present invention, a pixel circuit is provided, which includes: a data writing module, a driving module, a storage module, a light emitting module, a first initialization module and an initialization compensation module;

[0006] The data writing module is connected between the driving module and the data line, and is used to transmit the data voltage provided by the data line to the control end of the driving module during the data writing phase;

[0007] The storage module is connected to the control end of the driving module, and the storage module is used to store the voltage of the control end of the driving module;

[0008] The driving module is connected to the first end of the light emitting module, and is used to generate a driving current in the light emitting stage to drive the light emitting module to emit light;

[0009] The first initialization module is connected between the initialization signal line and the first end of the light emitting module, and is used to initialize the first end of the light emitting module in a first initialization phase;

[0010] The initialization compensation module is connected between the control terminal of the driving module and the first terminal of the light emitting module. The initialization compensation module is used to write the voltage of the control terminal of the driving module into the first terminal of the light emitting module before the data writing phase.

[0011] Optionally, the initialization compensation module is configured to write the voltage of the control terminal of the driving module into the first terminal of the light-emitting module before or after the first initialization phase, or during at least a portion of the first initialization phase.

[0012] Optionally, the initialization compensation module includes a first transistor;

[0013] The control electrode of the first transistor is connected to the first scanning signal line, the first electrode of the first transistor is connected to the control end of the driving module, and the second electrode of the first transistor is connected to the first end of the light emitting module.

[0014] Optionally, the initialization compensation module includes a first transistor and a first capacitor;

[0015] The control electrode of the first transistor is connected to the first scanning signal line, the first electrode of the first transistor is connected to the control terminal of the driving module, and the second electrode of the first transistor is connected to the first terminal of the light-emitting module via the first capacitor;

[0016] Alternatively, the control electrode of the first transistor is connected to the first scanning signal line, the first electrode of the first transistor is connected to the control end of the driving module through the first capacitor, and the second electrode of the first transistor is connected to the first end of the light emitting module.

[0017] Optionally, the storage module includes a second capacitor;

[0018] The second capacitor is connected to the control terminal of the driving module; the capacitance of the second capacitor is greater than the capacitance of the first capacitor.

[0019] Optionally, the pixel circuit further includes a second initialization module;

[0020] The first end of the second initialization module is connected to the initialization signal line, and the second end of the second initialization module is connected to the control end of the driving module. The second initialization module is used to initialize the control end of the driving module in a second initialization phase; wherein the second initialization phase is before the data writing phase; the initialization compensation module is used to write the voltage of the control end of the driving module into the first end of the light-emitting module in the second initialization phase, or, before the second initialization phase, write the voltage of the control end of the driving module into the first end of the light-emitting module.

[0021] Optionally, the initialization compensation module is configured to write the voltage of the control terminal of the driving module into the first terminal of the light-emitting module during an overlapping period of the first initialization phase and the second initialization phase.

[0022] Optionally, the control end of the initialization compensation module is connected to the first scan signal line, the control end of the second initialization module is connected to the second scan signal line, and the second scan signal line and the first scan signal line are the same scan signal line;

[0023] Optionally, the control end of the first initialization module is connected to a fourth scanning signal line; the fourth scanning signal line and the first scanning signal line are the same scanning signal line.

[0024] Optionally, the data writing module includes a data writing unit and a threshold compensation unit, wherein a first end of the data writing unit is connected to the data line, and a second end of the data writing unit is connected to a first end of the driving module; the threshold compensation unit is connected between the second end of the driving module and a control end of the driving module, and is used to perform threshold compensation on the driving module;

[0025] Optionally, the control end of the data writing unit and the control end of the threshold compensation unit are connected to the third scan signal line;

[0026] Optionally, the pixel circuit further includes a first light emitting control module and a second light emitting control module;

[0027] The first end of the driving module is connected to the first power supply through the first light control module, and the second end of the driving module is connected to the first end of the light emitting module through the second light control module;

[0028] The control end of the first light emitting control module and the control end of the second light emitting control module are connected to the light emitting control signal line. The first light emitting control module and the second light emitting control module are used to control whether the driving current is transmitted to the light emitting module.

[0029] According to another aspect of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit includes a data writing module, a driving module, a storage module, a light emitting module, a first initialization module, and an initialization compensation module;

[0030] The data writing module is connected between the driving module and the data line, and the storage module is electrically connected to the control end of the driving module; the driving module is electrically connected to the first end of the light-emitting module; the first initialization module is connected between the initialization signal line and the first end of the light-emitting module; and the initialization compensation module is connected between the control end of the driving module and the first end of the light-emitting module.

[0031] Drive methods include:

[0032] In the initialization compensation stage, the initialization compensation module writes the voltage of the control terminal of the driving module into the first terminal of the light-emitting module;

[0033] In the first initialization phase, the first initialization module writes the initialization voltage provided by the initialization signal line into the first end of the light-emitting module to initialize the light-emitting module; wherein the initialization compensation phase is before or after the first initialization phase, or the initialization compensation phase partially overlaps or coincides with the first initialization phase;

[0034] In the data writing phase, the data writing module writes the data voltage provided by the data line into the driving module;

[0035] In the light-emitting stage, the driving module generates a driving current according to the data voltage, and the light-emitting module emits light in response to the driving current.

[0036] Optionally, the pixel circuit further includes a second initialization module; a first end of the second initialization module is connected to the initialization signal line, and a second end of the second initialization module is connected to the control end of the driving module;

[0037] The driving method also includes:

[0038] In the second initialization phase, the second initialization module writes the initialization voltage provided by the initialization signal line into the control terminal of the driving module to initialize the control terminal of the driving module; wherein the initialization compensation phase is before the second initialization phase, or the second initialization phase and the initialization compensation phase are in the same time period;

[0039] Optionally, the initialization compensation phase overlaps with an overlapping period of the first initialization phase and the second initialization phase.

[0040] According to another aspect of the present invention, a display panel is provided. The display panel includes the pixel circuit according to any embodiment of the present invention.

[0041] According to the technical solution of the embodiment of the present invention, when the voltage of the data of the previous frame is large, the current flowing through the light-emitting module is small, the residual charge at the first end of the light-emitting module is small, and the light-emitting module is easier to initialize completely; when the voltage of the data of the previous frame is small, the current flowing through the light-emitting module is large, the residual charge at the first end of the light-emitting module is large, and the light-emitting module is less completely initialized. Before the data writing stage, the initialization compensation module first writes the voltage of the control end of the driving module stored in the storage module (equivalent to or approximately equal to the voltage of the previous frame data) into the first end of the light-emitting module, and writes a charge to the first end of the light-emitting module. The larger the voltage of the previous frame data, the larger the voltage of the control end of the driving module, and the more charge written to the first end of the light-emitting module, so that the initialization degree is reduced, and the initialization degree changes from a relatively complete to a relatively incomplete initialization degree, for example, the initialization degree changes from a relatively complete initialization degree to a medium initialization degree; the smaller the voltage of the previous frame data, the smaller the voltage of the control end of the driving module, and the less charge written to the first end of the light-emitting module, so that the initialization degree is increased, and the initialization degree changes from a relatively incomplete to a relatively complete initialization degree, for example, to a medium initialization degree, thereby compensating for the initialization effect of the light-emitting module, making the initialization degree of each frame tend to be consistent, thereby reducing the brightness difference between different frames and improving the display effect of the display panel.

[0042] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a structural schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0045] Figure 2 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0046] Figure 3 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0047] Figure 4 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0048] Figure 5 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0049] Figure 6 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0050] Figure 7 is a timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0051] Figure 8 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0052] Figure 9 is a timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0053] Figure 10 is a timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0054] Figure 11 is a flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0055] Figure 12 is a flowchart of another pixel circuit driving method provided by an embodiment of the present invention;

[0056] Figure 13 It is a structural schematic diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the term "comprises" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] As mentioned in the background technology, the existing display panel has a problem of a large brightness difference between the first frame and the subsequent frame (i.e., the second frame and thereafter) after switching the screen. After careful research, the applicant found that the reason for this technical problem is that: when the display panel switches the screen, for example, when switching from a black screen to a low-brightness screen, the current flowing through the light-emitting diode when the black screen is displayed before the switch is very small, so that in the first frame after the screen is switched, the residual charge on the anode of the light-emitting diode is small, so that the anode initialization of the light-emitting diode in the first frame after the screen is switched is relatively complete; while in the second frame, since the brightness of the previous frame (the first frame after the screen is switched) is large, the current flowing through the light-emitting diode is large, the residual charge on the anode of the light-emitting diode is large, so that the anode initialization of the light-emitting diode in the second frame is relatively incomplete. Similarly, the anode initialization of the light-emitting diode in the third frame and the subsequent frames is relatively incomplete. Therefore, after the display panel switches the screen, the initialization degree of the first frame and the subsequent frame is different, resulting in a large difference in display brightness between the first frame and the subsequent frame, affecting the display effect of the display panel.

[0060] In response to the above technical problems, an embodiment of the present invention provides a pixel circuit. Figure 1 This is a schematic diagram of a pixel circuit according to an embodiment of the present invention. Figure 1 The pixel circuit provided by the embodiment of the present invention includes: a data writing module 101, a driving module 102, a storage module 103, a light emitting module 104, a first initialization module 105 and an initialization compensation module 106.

[0061] The data writing module 101 is connected between the driving module 102 and the data line Data, and is used to transmit the data voltage provided by the data line to the control end of the driving module 102 during the data writing phase; the storage module 103 is connected to the control end of the driving module 102, and is used to store the voltage at the control end of the driving module 102; the driving module 102 is connected to the first end of the light-emitting module 104, and is used to generate a driving current during the light-emitting phase to drive the light-emitting module 104 to emit light; the first initialization module 105 is connected between the initialization signal line Vref and the first end of the light-emitting module 104, and is used to initialize the first end of the light-emitting module 104 during the first initialization phase; the initialization compensation module 106 is connected between the control end of the driving module 102 and the first end of the light-emitting module 104, and is used to write the voltage at the control end of the driving module 102 to the first end of the light-emitting module 104 before the data writing phase to compensate for the initialization effect of the light-emitting module 104.

[0062] The driver module 102 is connected, for example, between a first power supply VDD and a first terminal of the light-emitting module 104. The first power supply VDD can provide a first power supply voltage Vdd. The second terminal of the light-emitting module 104 is connected to a second power supply VSS. The light-emitting module 104 is configured to emit light in response to a driving current generated by the driver module 102. The data line Data can provide a data voltage Vdata. The data writing module 101 writes the data voltage Vdata into the driver module 102. The driver module 102 generates a driving current based on the first power supply voltage Vdd and the data voltage Vdata. The driving current is a function of Vgs-Vth, that is, a function related to Vdd-Vdata. The light-emitting module 104 emits light in response to the driving current. Vth is the threshold voltage of the driver module 102. The storage module 103 can store the voltage at the control terminal of the driver module 102 and maintain the voltage at the control terminal of the driver module 102. The first initialization module 105 can write the initialization voltage provided by the initialization signal line Vref to the first terminal of the light-emitting module 104 to initialize the light-emitting module 104. Since the driving current is a function related to Vdd-Vdata, the larger the previous frame data voltage Vdata is, the smaller the current flowing through the light-emitting module 104 is, that is, the less residual charge is at the first end of the light-emitting module 104, and the more complete the initialization will be. Similarly, the smaller the previous frame data voltage is, the larger the current flowing through the light-emitting module 104 is, that is, the more residual charge is at the first end of the light-emitting module 104, and the more incomplete the initialization will be. Before the data writing phase, the initialization compensation module 106 writes the previous frame voltage (the voltage at the control end of the driving module 102) stored in the storage module 103 to the first end of the light-emitting module 104, and writes charge to the first end of the light-emitting module 104. The previous frame voltage is the sum of the previous frame data voltage and the threshold voltage of the driving module 102, or the previous frame voltage is the previous frame data voltage. That is, the previous frame voltage is related to the previous frame data voltage. The larger the previous frame data voltage is, the larger the voltage at the control end of the driving module 102 is, and the charge written to the first end of the light-emitting module 104 is. The more, the lower the initialization degree, the initialization degree changes from relatively complete to relatively incomplete, for example, the initialization degree changes from relatively complete to medium initialization; the smaller the data voltage of the previous frame, the smaller the voltage of the control end of the driving module 102, and the less charge written to the first end of the light-emitting module 104, so that the initialization degree is improved, and the initialization degree changes from relatively incomplete to relatively complete, for example, to medium initialization, thereby compensating for the initialization effect of the light-emitting module 104, making the initialization degree of each frame tend to be consistent, thereby reducing the brightness difference between different frames and improving the display effect of the display panel.

[0063] The working process of the pixel circuit provided by the embodiment of the present invention within at least one display frame may include an initialization compensation phase, a first initialization phase, a data writing phase, and a light emitting phase.

[0064] Specifically, in the initialization compensation stage, the storage module 103 stores the voltage of the control terminal of the driving module 102 (related to the data voltage of the previous frame, for example, equal to or close to the data voltage of the previous frame). Before the data voltage writing stage, the initialization compensation module 106 writes the voltage of the control terminal of the driving module 102 stored in the storage module 103 into the first terminal of the light-emitting module 104, and writes charge to the first terminal of the light-emitting module 104. The larger the voltage of the previous frame data, the larger the voltage of the control terminal of the driving module 102, and the more charge written to the first terminal of the light-emitting module 104, so that the initialization degree is reduced, and the initialization degree changes from relatively complete to less complete, for example, from relatively complete to medium initialization degree; the smaller the voltage of the previous frame data, the smaller the voltage of the control terminal of the driving module 102, and the less charge written to the first terminal of the light-emitting module 104, so that the initialization degree is improved, and the initialization degree changes from relatively incomplete to relatively complete, for example, to medium initialization degree, thereby compensating for the initialization effect of the light-emitting module 104.

[0065] In the first initialization stage, the first initialization module 105 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light-emitting module 104 to initialize the light-emitting module 104 to further complete the initialization of the light-emitting module 104. Since the charge is written to the first end of the light-emitting module 104 in advance in the initialization compensation stage, the initialization degree of the light-emitting module 104 in each frame tends to be consistent.

[0066] In the data writing phase, the data writing module 101 writes the data voltage Vdata into the driving module 102 .

[0067] During the light-emitting phase, the driver module 102 generates a driving current based on the first power supply voltage Vdd and the data voltage Vdata, and the light-emitting module 104 emits light in response to the driving current. Because the initialization level of the light-emitting module 104 is consistent throughout each frame, the driving current used by the light-emitting module 104 during each frame is consistent. This results in consistent brightness across each frame, minimizing the difference in brightness between the first and subsequent frames after switching between screens, thereby improving the display quality of the display panel.

[0068] It should be noted that the data writing phase may partially overlap or coincide with the first initialization phase or may not overlap (for example, before or after). The data writing phase may also be performed simultaneously with the first initialization phase, that is, the data writing phase and the first initialization phase are in the same time period. The data writing phase may also be performed in time-sharing with the first initialization phase, that is, not overlapping. This embodiment does not limit this. When the data writing phase and the first initialization phase are performed in time-sharing, the initialization compensation phase may partially overlap or coincide with the first initialization phase, that is, the start time of the initialization compensation phase is before, after, or at the same time as the start time of the first initialization phase; the end time of the initialization compensation phase is before or after the end time of the first initialization phase, or the end time of the initialization compensation phase is the same as the end time of the first initialization phase; thereby, while initializing the first end of the light-emitting module 104, the initialization compensation module 106 writes the voltage of the control end of the driving module 102 stored by the storage module 103 into the first end of the light-emitting module 104, writes the charge to the first end of the light-emitting module 104, and compensates for the initialization effect of the light-emitting module 104. The first initialization phase may also be performed before the initialization compensation phase, i.e., the first terminal of the light-emitting module 104 is initialized first, and then the voltage of the control terminal of the driving module 102 stored by the storage module 103 is written to the first terminal of the light-emitting module 104 to compensate for the initialization effect. The first initialization phase may also be performed after the initialization compensation phase, i.e., the charge is first written to the first terminal of the light-emitting module 104, and then the first terminal of the light-emitting module 104 is initialized to compensate for the initialization effect.

[0069] According to the technical solution of this embodiment, when the data voltage of the previous frame is large, the current flowing through the light-emitting module is small, the residual charge at the first terminal of the light-emitting module is small, and the light-emitting module is easier to initialize completely; when the data voltage of the previous frame is small, the current flowing through the light-emitting module is large, the residual charge at the first terminal of the light-emitting module is large, and the light-emitting module is initialized less completely. Before the data voltage writing phase, the initialization compensation module first writes the voltage of the control terminal of the driving module stored in the storage module into the first terminal of the light-emitting module, and writes charge to the first terminal of the light-emitting module. The larger the data voltage of the previous frame, the larger the voltage of the control terminal of the driving module, and the more charge written to the first terminal of the light-emitting module, so that the initialization degree is reduced, and the initialization degree changes from relatively complete to relatively incomplete, for example, from relatively complete to medium initialization; the smaller the data voltage of the previous frame, the smaller the voltage of the control terminal of the driving module, and the less charge written to the first terminal of the light-emitting module, so that the initialization degree is improved, and the initialization degree changes from relatively incomplete to relatively complete, for example, to medium initialization, thereby compensating the initialization effect of the light-emitting module, making the initialization degree of each frame tend to be consistent, thereby reducing the brightness difference between different frames and improving the display effect of the display panel.

[0070] Based on the above technical solution, the initialization compensation module 106 is configured to write the voltage at the control terminal of the driver module 102 to the first terminal of the light-emitting module 104 before or after the first initialization phase, or during at least a portion of the first initialization phase. That is, when the initialization compensation phase precedes the data writing phase, the initialization compensation phase of the initialization compensation module 106 can be performed before or after the first initialization phase, or the initialization compensation phase can at least partially overlap with the first initialization phase. Alternatively, the initialization compensation phase can partially overlap or coincide with the first initialization phase.

[0071] Based on the above technical solution, the initialization compensation module 106 can be implemented by a transistor or by a transistor connected in series with a capacitor. The specific structure of the initialization compensation module 106 is described below, but it does not limit the present application.

[0072] In one embodiment, Figure 2 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 2 The initialization compensation module 106 includes a first transistor T1; the control electrode of the first transistor T1 is connected to the first scan signal line Scan1, the first electrode of the first transistor T1 is connected to the control end of the driving module 102, and the second electrode of the first transistor T1 is connected to the first end of the light emitting module 104.

[0073] Specifically, before the light-emitting module 104 is initialized, that is, before the data writing stage, in the initialization compensation stage, the first transistor T1 is turned on, and the turned-on first transistor T1 writes the voltage of the control end of the driving module 102 stored in the storage module 103 (related to the voltage of the previous frame data) into the first end of the light-emitting module 104, and writes charge to the first end of the light-emitting module 104. The larger the voltage of the previous frame data, the larger the voltage of the control end of the driving module 102, and the more charge written to the first end of the light-emitting module 104, so that the initialization degree is reduced, and the initialization degree changes from relatively complete to less complete, for example, the initialization degree changes from relatively complete to medium initialization. etc.; the smaller the data voltage of the previous frame, the smaller the voltage of the control end of the driving module 102, and the less charge written to the first end of the light-emitting module 104, so that the initialization degree is improved, and the initialization degree changes from less complete to more complete, for example, becomes a medium initialization degree, thereby compensating for the initialization effect of the light-emitting module 104, so that the initialization degree of the light-emitting module 104 in each frame tends to be consistent, so the driving current of the light-emitting module 104 when emitting light in each frame tends to be consistent, and then the light-emitting brightness of the light-emitting module 104 in each frame tends to be consistent, reducing the brightness difference between the first frame and the subsequent frame of the light-emitting module 104 after switching the screen, and improving the display effect of the display panel.

[0074] In another embodiment, Figure 3 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 3 , the initialization compensation module 106 includes a first transistor T1 and a first capacitor C1; the control electrode of the first transistor T1 is connected to the first scan signal line Scan1, the first electrode of the first transistor T1 is connected to the control terminal of the driving module 102, and the second electrode of the first transistor T1 is connected to the first terminal of the light-emitting module 104 through the first capacitor C1; or, Figure 4 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 4 The control electrode of the first transistor T1 is connected to the first scan signal line Scan1, the first electrode of the first transistor T1 is connected to the control end of the driving module 102 through the first capacitor C1, and the second electrode of the first transistor T1 is connected to the first end of the light emitting module 104.

[0075] Specifically, the first capacitor C1 can be connected between the control terminal of the driver module 102 and the first electrode of the first transistor T1. The first capacitor C1 couples the voltage of the control terminal of the driver module 102 maintained by the control terminal of the driver module 102 to the first electrode of the first transistor T1. During the initialization compensation phase, when the first transistor T1 is turned on, the coupled voltage is written into the first terminal of the light-emitting module 104, thereby writing charge into the first terminal of the light-emitting module 104, which helps compensate for the initialization effect of the light-emitting module 104. Since the capacitance of the first capacitor C1 is relatively small and the capacitive reactance of the first capacitor C1 is relatively large, the voltage coupled to the first electrode of the first transistor T1 is relatively small, which can avoid excessive charge being compensated to the first terminal of the light-emitting module 104, avoid overcompensation, and prevent poor subsequent initialization effect.

[0076] The first capacitor C1 can also be connected between the second electrode of the first transistor T1 and the first terminal of the light-emitting module 104. During the initialization compensation phase, when the first transistor T1 is turned on, the first transistor T1 writes the voltage at the control terminal of the driver module 102 maintained by the control terminal of the driver module 102 into the first electrode of the first capacitor C1. The first capacitor C1 couples part of the voltage to the first terminal of the light-emitting module 104 through coupling, thereby writing charge into the first terminal of the light-emitting module 104, which is beneficial for compensating for the initialization effect of the light-emitting module 104. Since the capacitance of the first capacitor C1 is relatively small and the capacitive reactance of the first capacitor C1 is relatively large, the voltage coupled to the first electrode of the first transistor T1 is relatively small, which can avoid excessive charge being compensated to the first terminal of the light-emitting module 104, avoid over-compensation, and prevent poor subsequent initialization effect.

[0077] Optionally, refer to Figure 3The storage module 103 includes a second capacitor C2; the second capacitor C2 is connected to the control terminal of the driving module 102; the capacitance of the second capacitor C2 is greater than the capacitance of the first capacitor C1.

[0078] Specifically, during the initialization compensation phase, when the first transistor T1 is turned on, the first capacitor C1 and the second capacitor C2 are connected in series. By setting the capacitance of the second capacitor C2 to be greater than that of the first capacitor C1, that is, the capacitance of the first capacitor C1 is smaller and the capacitive reactance of the first capacitor C1 is larger, the first capacitor C1 can only couple a portion of the charge to the first terminal of the light-emitting module 104, and cannot fully couple the voltage of the control terminal of the driver module 102 to the first terminal of the light-emitting module 104. This can prevent excessive charge from being written to the first terminal of the light-emitting module 104 and avoid overcompensation. Optionally, the first electrode of the second capacitor C2 is connected to the first power supply VDD, and the second electrode of the second capacitor C2 is connected to the control terminal of the driver module 102.

[0079] In the above technical solutions, optionally, refer to Figure 2 or Figure 3 The pixel circuit also includes a second initialization module 107; the control end of the second initialization module 107 is connected to the second scanning signal line Scan2, the first end of the second initialization module 107 is connected to the initialization signal line Vref, and the second end of the second initialization module 107 is connected to the control end of the driving module 102. The second initialization module 107 is used to initialize the control end of the driving module 102 in the second initialization phase.

[0080] Among them, optionally, the second initialization phase is before the data writing phase, that is, before the data voltage provided by the data line is transmitted to the control end of the driver module 102, to initialize the control end of the driver module 102. Optionally, the second initialization phase and the initialization compensation phase may partially overlap or coincide or not overlap (for example, before or after). Optionally, the initialization compensation module 106 is used to write the voltage of the control end of the driver module 102 stored in the storage module 103 into the first end of the light-emitting module 104 in the second initialization phase, that is, the initialization compensation phase is performed simultaneously with the second initialization phase, or, before the second initialization phase, the voltage of the control end of the driver module 102 stored in the storage module 103 is written into the first end of the light-emitting module 104, that is, the initialization compensation phase is performed before the second initialization phase.

[0081] Optionally, the initialization compensation module 106 is configured to write the voltage at the control terminal of the driver module 102 stored in the storage module 103 to the first terminal of the light-emitting module 104 during the overlapping period of the first initialization phase and the second initialization phase. Optionally, the initialization compensation phase may partially overlap or coincide with the first initialization phase and the second initialization phase. That is, while the first terminal of the light-emitting module 104 and the control terminal of the driver module 102 are being initialized, the initialization compensation module 106 writes the voltage at the control terminal of the driver module 102 stored in the storage module 103 to the first terminal of the light-emitting module 104. In this way, the voltage at the control terminal of the driver module 102 can be written to the first terminal of the light-emitting module 104 via two paths, thereby accelerating the initialization compensation process. One path is from the control terminal of the driver module 102 through the initialization compensation module 106 to the first terminal of the light-emitting module 104, and the other path is from the control terminal of the driver module 102 through the first initialization module 105 and the second initialization module 107 to the first terminal of the light-emitting module 104. Optionally, the start time of the initialization compensation phase may be the same as the start time of the second initialization phase, or the start time of the initialization compensation phase may be before the start time of the second initialization phase. Optionally, the end time of the initialization compensation phase may be the same as the end time of the second initialization phase, or the end time of the initialization compensation phase may be before the end time of the first initialization phase. The first initialization phase may overlap with the data writing phase, which can increase the initialization compensation speed and ensure complete initialization without taking up too much time.

[0082] Specifically, the second scanning signal provided by the second scanning signal line Scan2 can control whether the second initialization module 107 is turned on. When the second initialization module 107 is turned on, the second initialization module 107 writes the initialization voltage provided by the initialization signal line Vref into the control terminal of the driving module 102 to initialize the driving module 102.

[0083] The initialization compensation module 106 may compensate the first terminal of the light-emitting module 104 before the second initialization phase. Before the second initialization phase, the control terminal of the driver module 102 still maintains the voltage of the control terminal of the driver module 102 (related to the voltage of the previous frame data, for example, equal to or close to the voltage of the previous frame data). The initialization compensation module 106 may write the voltage of the control terminal of the driver module 102 to the first terminal of the light-emitting module 104, thereby writing charge to the first terminal of the light-emitting module 104. The larger the voltage of the previous frame data, the larger the voltage of the control terminal of the driver module 102, and the more charge written to the first terminal of the light-emitting module 104, thereby reducing the degree of initialization, and changing the degree of initialization from relatively complete to less complete, for example, from relatively complete to medium initialization. The smaller the voltage of the previous frame data, the smaller the voltage of the control terminal of the driver module 102, and the less charge written to the first terminal of the light-emitting module 104, thereby increasing the degree of initialization, and changing the degree of initialization from relatively incomplete to relatively complete, for example, to medium initialization. This compensates for the initialization effect of the light-emitting module 104, so that the degree of initialization of the light-emitting module 104 tends to be consistent in each frame.

[0084] In some other implementations, the initialization compensation module 106 may also compensate the first end of the light emitting module 104 in the second initialization phase. During the second initialization phase, the second initialization module 107 writes an initialization voltage to the control terminal of the driver module 102. However, writing the initialization voltage takes some time. Therefore, during the process of writing the initialization voltage, the control terminal of the driver module 102 still maintains a portion of the charge of the voltage of the previous frame (related to the data voltage of the previous frame, for example, close to or equal to the data voltage of the previous frame). By writing the voltage of the control terminal of the driver module 102 to the first terminal of the light-emitting module 104, charge is written to the first terminal of the light-emitting module 104. The larger the data voltage of the previous frame, the larger the voltage of the control terminal of the driver module 102, and the more charge is written to the first terminal of the light-emitting module 104, thereby reducing the degree of initialization, and changing the degree of initialization from relatively complete to less complete, for example, from relatively complete to medium initialization. The smaller the data voltage of the previous frame, the smaller the voltage of the control terminal of the driver module 102, and the less charge is written to the first terminal of the light-emitting module 104, thereby increasing the degree of initialization, and changing the degree of initialization from relatively incomplete to relatively complete, for example, to medium initialization. This compensates for the initialization effect of the light-emitting module 104, so that the initialization degree of the light-emitting module 104 tends to be consistent in each frame.

[0085] Figure 5 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 5The second scan signal line Scan2 carries the same scan signal as the first scan signal line Scan1. The second scan signal line Scan2 is connected to the first scan signal line Scan1; optionally, the second scan signal line Scan2 and the first scan signal line Scan1 can be the same scan signal line. The initialization compensation module 106 is configured to write the voltage at the control terminal of the driver module 102, stored in the storage module 103, to the first terminal of the light-emitting module 104 during the second initialization phase.

[0086] Specifically, the second scan signal line Scan2 carries the same scan signal as the first scan signal line Scan1, and the second scan signal line Scan2 is connected to the first scan signal line Scan1. The second scan signal line Scan2 and the first scan signal line Scan1 can be connected to the same shift register, thereby reducing the number of shift registers and facilitating a reduction in the bezel of the display panel. Because the second scan signal line Scan2 carries the same scan signal as the first scan signal line Scan1, the operating timing of the initialization compensation module 106 is the same as the operating timing of the second initialization module 107. In the second initialization phase, the initialization compensation module 106 writes the voltage of the control terminal of the driving module 102 stored in the storage module 103 to the first terminal of the light-emitting module 104. During the second initialization phase, the second initialization module 107 writes an initialization voltage to the control terminal of the driver module 102. However, writing the initialization voltage takes some time. Therefore, during the process of writing the initialization voltage, the control terminal of the driver module 102 still maintains a portion of the charge of the voltage of the previous frame (related to the data voltage of the previous frame). By writing the voltage of the control terminal of the driver module 102 to the first terminal of the light-emitting module 104, charge is written to the first terminal of the light-emitting module 104. The larger the data voltage of the previous frame, the larger the voltage of the control terminal of the driver module 102, and the more charge is written to the first terminal of the light-emitting module 104, thereby reducing the degree of initialization, and changing the degree of initialization from relatively complete to less complete, for example, from relatively complete to medium initialization. The smaller the data voltage of the previous frame, the smaller the voltage of the control terminal of the driver module 102, and the less charge is written to the first terminal of the light-emitting module 104, thereby increasing the degree of initialization, and changing the degree of initialization from relatively incomplete to relatively complete, for example, to medium initialization. This compensates for the initialization effect of the light-emitting module 104, so that the initialization degree of the light-emitting module 104 tends to be consistent in each frame.

[0087] Optionally, the control end of the first initialization module 105 is connected to the fourth scan signal line Scan4; the fourth scan signal line Scan4 and the first scan signal line Scan1 are the same scan signal line.

[0088] Specifically, the fourth scan signal line Scan4 is the same scan signal line as the first scan signal line Scan1. The fourth scan signal line Scan4 and the first scan signal line Scan1 can be connected to the same shift register, thereby reducing the number of shift registers and facilitating a smaller bezel of the display panel. In this case, the first initialization phase of the first initialization module 105 and the initialization compensation phase of the initialization compensation module 106 occur in the same time period. That is, during the initialization of the first end of the light-emitting module 104, the initialization compensation module 106 writes charge to the first end of the light-emitting module 104 to compensate for the initialization effect.

[0089] Optionally, the data writing module 101 includes a data writing unit 1011 and a threshold compensation unit 1012. The first end of the data writing unit 1011 is connected to the data line Data, and the second end of the data writing unit 1011 is connected to the first end of the driving module 102. The threshold compensation unit 1012 is connected between the second end of the driving module 102 and the control end of the driving module 102. The threshold compensation unit 1012 is used to perform threshold compensation on the driving module 102.

[0090] Specifically, the threshold compensation unit 1012 can perform threshold compensation on the driving module 102, thereby writing the threshold compensated voltage to the control end of the driving module 102, avoiding the change in the driving current caused by the threshold voltage change of the driving module 102, which is conducive to the light-emitting module 104 to better display the target display brightness.

[0091] Optionally, the control end of the data writing unit 1011 is connected to the third scan signal line Scan3. Optionally, the control end of the threshold compensation unit 1012 is connected to the third scan signal line Scan3.

[0092] Optionally, refer to Figure 2 or Figure 3 , the pixel circuit further includes a first light emitting control module 109 and a second light emitting control module 110;

[0093] The first end of the driving module 102 is connected to the first power supply VDD through the first light-emitting control module 109, and the second end of the driving module 102 is connected to the first end of the light-emitting module 104 through the second light-emitting control module 110; the control end of the first light-emitting control module 109 and the control end of the second light-emitting control module 110 are connected to the light-emitting control signal line EM, and the first light-emitting control module 109 and the second light-emitting control module 110 are used to control whether the driving current is transmitted to the light-emitting module 104.

[0094] Optionally, the scan signals on the third scan signal line Scan3 and the fourth scan signal line Scan4 are the same. The third scan signal line Scan3 is connected to the fourth scan signal line Scan4. Optionally, the third scan signal line Scan3 and the fourth scan signal line Scan4 can be the same scan signal line. The first initialization phase can be performed simultaneously with the data writing and threshold compensation phases.

[0095] Optionally, the scan signals on the second scan signal line Scan2, the first scan signal line Scan1, and the fourth scan signal line Scan4 are the same. The second scan signal line Scan2, the first scan signal line Scan1, and the fourth scan signal line Scan4 are connected; optionally, the second scan signal line Scan2, the first scan signal line Scan1, and the fourth scan signal line Scan4 can be the same scan signal line. The initialization compensation module 106 is configured to write the previous frame voltage (the voltage at the control terminal of the driving module 102) stored in the storage module 103 to the first terminal of the light-emitting module 104 during the overlapping period of the first initialization phase and the second initialization phase.

[0096] Illustratively, the operation process of the pixel circuit provided by the embodiment of the present invention within at least one display frame may include an initialization compensation phase, a second initialization phase, a first initialization phase, a data writing phase, and a light emitting phase.

[0097] During the initialization compensation phase, the initialization compensation module 106 is turned on, and the storage module 103 stores the voltage of the control terminal of the driving module 102 (related to the voltage of the previous frame data). The initialization compensation module 106 writes the voltage of the control terminal of the driving module 102 stored in the storage module 103 into the first terminal of the light-emitting module 104, and writes a charge into the first terminal of the light-emitting module 104. The larger the voltage of the previous frame data, the larger the voltage of the control terminal of the driving module 102, and the more charge written into the first terminal of the light-emitting module 104, thereby reducing the degree of initialization, and changing the degree of initialization from relatively complete to relatively incomplete, for example, from relatively complete to medium initialization. The smaller the voltage of the previous frame data, the smaller the voltage of the control terminal of the driving module 102, and the less charge written into the first terminal of the light-emitting module 104, thereby increasing the degree of initialization, and changing the degree of initialization from relatively incomplete to relatively complete, for example, to medium initialization, thereby compensating for the initialization effect of the light-emitting module 104.

[0098] In the second initialization phase, the second initialization module 107 is turned on, and the second initialization module 107 writes the initialization voltage provided by the initialization signal line Vref into the control terminal of the driving module 102 to initialize the driving module 102 .

[0099] In the first initialization stage, the first initialization module 105 is turned on, and the first initialization module 105 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light-emitting module 104 to initialize the light-emitting module 104. Since the charge is written to the first end of the light-emitting module 104 in advance, the initialization degree of the light-emitting module 104 in each frame tends to be consistent.

[0100] In the data writing stage, the data writing module 101 and the threshold compensation module 108 are turned on, and the data writing module 101 writes the data voltage Vdata into the control end of the driving module 102 through the turned-on driving module 103 and the threshold compensation module 108, thereby writing the threshold-compensated voltage into the control end of the driving module 102.

[0101] During the light-emitting phase, the first light-emitting control module 109 and the second light-emitting control module 110 are turned on, the driver module 102 generates a driving current based on the first power supply voltage Vdd and the data voltage Vdata, and the light-emitting module 104 emits light in response to the driving current. The initialization level of the light-emitting module 104 is consistent in each frame, so the driving current of the light-emitting module 104 during each frame is consistent. This results in a consistent brightness of the light-emitting module 104 during each frame, minimizing the brightness difference between the first and subsequent frames after switching between screens, thereby improving the display quality of the display panel.

[0102] As a further implementation of this embodiment, based on the above technical solutions, the specific structure of the pixel circuit is described below, but it does not limit the present application.

[0103] In one embodiment, Figure 6 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Figure 6 yes Figure 2 For the corresponding specific circuit structure, optionally, refer to Figure 6, the data writing unit 1011 includes a second transistor T2, the driving module 102 includes a third transistor T3, the first initialization module 105 includes a fourth transistor T4, the second initialization module 107 includes a fifth transistor T5, the threshold compensation unit 1012 includes a sixth transistor T6, the first light emitting control module 109 includes a seventh transistor T7, the second light emitting control module 110 includes an eighth transistor T8, and the light emitting module 104 includes a light emitting diode D1; the control electrode of the second transistor T2 is connected to the third scan signal line Scan3, the first electrode of the second transistor T2 is connected to the data line Data, the second electrode of the second transistor T2 is connected to the first electrode of the third transistor T3; the control electrode of the third transistor T3 is connected to the storage module 103, the first electrode of the third transistor T3 is connected to the first power supply VDD (for example, which can be a high DC voltage) through the seventh transistor T7, and the first electrode of the third transistor T3 is connected to the first power supply VDD (for example, which can be a high DC voltage). The second electrode is connected to the first electrode of the light-emitting diode D1 through the eighth transistor T8; the second electrode of the light-emitting diode D1 is connected to the second power supply VSS (for example, it can be a low DC voltage); the control electrodes of the seventh transistor T7 and the eighth transistor T8 are connected to the light-emitting control signal line EM; the control electrode of the fourth transistor T4 is connected to the fourth scanning signal line Scan4, the first electrode of the fourth transistor T4 is connected to the initialization signal line Vref, and the second electrode of the fourth transistor T4 is connected to the first electrode of the light-emitting diode D1; the control electrode of the fifth transistor T5 is connected to the second scanning signal line Scan2, the first electrode of the fifth transistor T5 is connected to the initialization signal line Vref, and the second electrode of the fifth transistor T5 is connected to the control electrode of the third transistor T3; the control electrode of the sixth transistor T6 is connected to the third scanning signal line Scan3, and the sixth transistor T6 is connected between the second electrode of the third transistor T3 and the control electrode of the third transistor T3. Figure 6 The figure shows only the case where all transistors are P-type transistors, but this is not limiting. In other embodiments, all transistors may be N-type transistors, or some may be N-type transistors and others may be P-type transistors. The fifth transistor T5 and the sixth transistor T6 may be dual-gate transistors, for example, which can reduce leakage current and prevent significant changes in the control electrode potential of the third transistor T3. This ensures that the third transistor T3 can better generate a drive current, allowing the light-emitting diode D1 to better respond to the drive current and emit light, which helps the light-emitting diode D1 display the target brightness. The first electrode of the light-emitting diode D1 can be an anode, and the second electrode of the light-emitting diode D1 can be a cathode.

[0104] Figure 7 This is a timing diagram of a pixel circuit provided by an embodiment of the present invention, combined with Figure 6 and Figure 7 , the driving process of the pixel circuit is described below, but is not limited thereto.

[0105] Specifically, in the initialization compensation phase t11, the first scanning signal S1 provided by the first scanning signal line Scan1 is a turn-on signal, for example, it can be a low level, the second scanning signal line Scan2, the third scanning signal line Scan3, the fourth scanning signal line Scan4 and the light-emitting control signal line EM provide turn-off signals, for example, it can be a high level, the first transistor T1 is turned on, and the first transistor T1 writes the voltage of the control end of the driving module 102 stored in the second capacitor C2 (related to the voltage of the previous frame data) into the first electrode of the light-emitting diode D1, and writes the voltage of the control end of the driving module 102 stored in the second capacitor C2 into the first electrode of the light-emitting diode D1. Charge, the greater the voltage of the previous frame data, the greater the voltage of the control end of the driving module 102, and the more charge written into the first electrode of the light-emitting diode D1, so that the initialization degree is reduced, and the initialization degree changes from relatively complete to relatively incomplete, for example, the initialization degree changes from relatively complete to medium initialization; the smaller the voltage of the previous frame data, the smaller the voltage of the control end of the driving module 102, and the less charge written into the first electrode of the light-emitting diode D1, so that the initialization degree is improved, and the initialization degree changes from relatively incomplete to relatively complete, for example, to medium initialization, thereby compensating for the initialization effect of the light-emitting diode D1.

[0106] In the second initialization stage t12, the second scanning signal S2 provided by the second scanning signal line Scan2 is a turn-on signal, for example, it can be a low level, the first scanning signal line Scan1, the third scanning signal line Scan3, the fourth scanning signal line Scan4 and the light-emitting control signal line EM provide turn-off signals, for example, it can be a high level, the fifth transistor T5 is turned on, and the fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref into the control electrode of the third transistor T3, thereby initializing the control electrode of the third transistor T3.

[0107] In the first initialization stage t13, the fourth scanning signal S4 provided by the fourth scanning signal line Scan4 is a turn-on signal, for example, it can be a low level, the first scanning signal line Scan1, the second scanning signal line Scan2, the third scanning signal line Scan3 and the light-emitting control signal line EM provide turn-off signals, for example, they can be a high level, the fourth transistor T4 is turned on, and the fourth transistor T4 writes the initialization voltage provided by the initialization signal line Vref into the first electrode of the light-emitting diode D1 to initialize the light-emitting diode D1. Since the charge is written to the first electrode of the light-emitting diode D1 in advance, the initialization degree of the light-emitting diode D1 in each frame tends to be consistent.

[0108] In the data writing stage t14, the third scanning signal S3 provided by the third scanning signal line Scan3 is a turn-on signal, for example, it can be a low level, the first scanning signal line Scan1, the second scanning signal line Scan2, the fourth scanning signal line Scan4 and the light-emitting control signal line EM provide turn-off signals, for example, it can be a high level, the second transistor T2 and the sixth transistor T6 are turned on, and the second transistor T2 writes the data voltage Vdata into the third transistor T3 through the sixth transistor T6, thereby writing the threshold-compensated voltage to the control electrode of the third transistor T3.

[0109] In the light-emitting stage t15, the light-emitting control signal E1 provided by the light-emitting control signal line EM is a turn-on signal, for example, a low level. The first scan signal line Scan1, the second scan signal line Scan2, the third scan signal line Scan3, and the fourth scan signal line Scan4 provide turn-off signals, for example, a high level. The seventh transistor T7 and the eighth transistor T8 are turned on, and the third transistor T3 generates a drive current based on the first power supply voltage Vdd and the data voltage Vdata. The light-emitting diode D1 emits light in response to the drive current. The initialization degree of the light-emitting diode D1 in each frame tends to be consistent, so the drive current when the light-emitting diode D1 emits light in each frame tends to be consistent, which in turn makes the light-emitting brightness of the light-emitting diode D1 in each frame tend to be consistent, reducing the brightness difference between the first frame and the subsequent frame after the screen is switched, and improving the display effect of the display panel.

[0110] In another embodiment, Figure 8 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Figure 8 yes Figure 3 The corresponding specific circuit structure, Figure 6 and Figure 8 The structures are the same or similar, except that: Figure 8 The initialization compensation module 106 includes a first transistor T1 and a first capacitor C1, the control electrode of the first transistor T1 is connected to the first scanning signal line Scan1, the first electrode of the first transistor T1 is connected to the control electrode of the third transistor T3, and the second electrode of the first transistor T1 is connected to the first electrode of the light-emitting diode D1 through the first capacitor C1; or, the control electrode of the first transistor T1 is connected to the first scanning signal line Scan1, the first electrode of the first transistor T1 is connected to the control electrode of the third transistor T3 through the first capacitor C1, and the second electrode of the first transistor T1 is connected to the first electrode of the light-emitting diode D1.

[0111] Figure 9 This is another timing diagram of a pixel circuit provided by an embodiment of the present invention, combined with Figure 8 and Figure 9 , the driving process of the pixel circuit is described below, but is not limited thereto.

[0112] Specifically, in the initialization compensation stage t21, the third scanning signal line Scan3, the fourth scanning signal line Scan4 and the light-emitting control signal line EM provide a shutdown signal, for example, it can be a high level, the first scanning signal S1 provided by the first scanning signal line Scan1 is a turn-on signal, for example, it can be a low level, the first transistor T1 is turned on, the second scanning signal S2 provided by the second scanning signal line Scan2 is a turn-on signal, for example, it can be a low level, the fifth transistor T5 is turned on, and the fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref into the control electrode of the third transistor T3, and initializes the control electrode of the third transistor T3. At the same time, the first transistor T1 writes the voltage of the control terminal of the driving module 102 stored in the second capacitor C2 (related to the voltage of the previous frame data) into the first electrode of the first capacitor C1. The first capacitor C1 couples part of the charge of the voltage of the control terminal of the driving module 102 to the first electrode of the light-emitting diode D1, and writes charge to the first electrode of the light-emitting diode D1. The larger the voltage of the previous frame data, the larger the voltage of the control terminal of the driving module 102, and the more charge written to the first electrode of the light-emitting diode D1, so that the initialization degree decreases, and the initialization degree changes from relatively complete to less complete, for example, from relatively complete to medium initialization degree. The smaller the voltage of the previous frame data, the smaller the voltage of the control terminal of the driving module 102, and the less charge written to the first electrode of the light-emitting diode D1, so that the initialization degree increases, and the initialization degree changes from relatively incomplete to relatively complete, for example, to medium initialization degree, thereby compensating for the initialization effect of the light-emitting diode D1.

[0113] During data writing phase t22, the first scan signal line Scan1, the second scan signal line Scan2, and the light-emission control signal line EM provide a shutoff signal (e.g., a high level). The third scan signal line Scan3 provides a third scan signal S3, e.g., a low level, turning on the second transistor T2 and the sixth transistor T6. The fourth scan signal line Scan4 provides a fourth scan signal S4, e.g., a low level, turning on the fourth transistor T4. The second transistor T2 writes the data voltage Vdata into the third transistor T3 via the sixth transistor T6, thereby writing a threshold-compensated voltage to the control electrode of the third transistor T3. The fourth transistor T4 writes the initialization voltage provided by the initialization signal line Vref into the first electrode of the light-emitting diode D1, thereby initializing the light-emitting diode D1. Since the charge is written to the first electrode of the light-emitting diode D1 in advance, the initialization level of the light-emitting diode D1 tends to be consistent throughout each frame.

[0114] In the light-emitting phase t23, the first scan signal line Scan1, the second scan signal line Scan2, the third scan signal line Scan3, and the fourth scan signal line Scan4 provide a shutdown signal, such as a high level. The light-emitting control signal E1 provided by the light-emitting control signal line EM is a conduction signal, such as a low level. The seventh transistor T7 and the eighth transistor T8 are turned on, and the third transistor T3 generates a drive current based on the first power supply voltage Vdd and the data voltage Vdata. The light-emitting diode D1 emits light in response to the drive current. The initialization degree of the light-emitting diode D1 in each frame tends to be consistent, so the drive current when the light-emitting diode D1 emits light in each frame tends to be consistent, which in turn makes the light-emitting brightness of the light-emitting diode D1 in each frame tend to be consistent, reducing the brightness difference between the first frame and the subsequent frame after the screen is switched, and improving the display effect of the display panel.

[0115] In another embodiment, Figure 10 This is another timing diagram of a pixel circuit provided by an embodiment of the present invention, referring to Figure 10 , the driving process of the pixel circuit is described below, but is not limited thereto.

[0116] In the initialization compensation phase t31, the third scan signal line Scan3 and the light-emitting control signal line EM provide a shut-off signal, for example, a high level. The first scan signal S1 provided by the first scan signal line Scan1 is a turn-on signal, for example, a low level, turning on the first transistor T1. The second scan signal S2 provided by the second scan signal line Scan2 is a turn-on signal, for example, a low level, turning on the fifth transistor T5. The fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref to the control electrode of the third transistor T3, thereby initializing the control electrode of the third transistor T3. The fourth scan signal S4 provided by the fourth scan signal line Scan4 is a turn-on signal, for example, a low level, turning on the first transistor T1 and the fourth transistor T4, thereby initializing the first electrode of the light-emitting diode D1. At the same time, the first transistor T1 writes the voltage of the control terminal of the driving module 102 stored in the second capacitor C2 into the first electrode of the first capacitor C1. The first capacitor C1 couples part of the charge of the voltage of the control terminal of the driving module 102 to the first electrode of the light-emitting diode D1, writing charge to the first electrode of the light-emitting diode D1, thereby compensating for the initialization effect of the first electrode of the light-emitting diode D1. In this way, the voltage at the control terminal of the driver module 102 can be written to the first terminal of the light-emitting module 104 via two paths, thereby accelerating the initialization and compensation process. One path is from the control terminal of the driver module 102 through the initialization and compensation module 106 to the first terminal of the light-emitting module 104, and the other path is from the control terminal of the driver module 102 through the first initialization module 105 and the second initialization module 107 to the first terminal of the light-emitting module 104.

[0117] In the data writing stage t32, the first scanning signal line Scan1, the second scanning signal line Scan2, the fourth scanning signal line Scan4 and the light-emitting control signal line EM provide a shutdown signal, for example, it can be a high level, and the third scanning signal S3 provided by the third scanning signal line Scan3 is a turn-on signal, for example, it can be a low level, the second transistor T2 and the sixth transistor T6 are turned on, and the second transistor T2 writes the data voltage Vdata into the third transistor T3 through the sixth transistor T6, thereby writing the threshold-compensated voltage to the control electrode of the third transistor T3.

[0118] In the light-emitting stage t33, the first scan signal line Scan1, the second scan signal line Scan2, the third scan signal line Scan3 and the fourth scan signal line Scan4 provide a shutdown signal, for example, it can be a high level, the light-emitting control signal E1 provided by the light-emitting control signal line EM is a turn-on signal, for example, it can be a low level, the seventh transistor T7 and the eighth transistor T8 are turned on, the third transistor T3 generates a driving current according to the first power supply voltage Vdd and the data voltage Vdata, and the light-emitting diode D1 emits light in response to the driving current.

[0119] This embodiment also provides a method for driving a pixel circuit, which is used to drive the pixel circuit provided by any of the above embodiments. Figure 11 This is a flowchart of a driving method for a pixel circuit provided by an embodiment of the present invention, with reference to Figure 1 and Figure 11 , the driving method of the pixel circuit includes:

[0120] S201 , in an initialization compensation stage, the initialization compensation module writes the voltage of the control terminal of the driving module stored in the storage module into the first terminal of the light-emitting module.

[0121] Specifically, in the initialization compensation stage, the storage module 103 stores the voltage of the control end of the driving module 102 (related to the voltage of the previous frame data), and the initialization compensation module 106 writes the voltage of the control end of the driving module 102 stored in the storage module 103 into the first end of the light-emitting module 104, and writes charge to the first end of the light-emitting module 104. The larger the voltage of the previous frame data, the larger the voltage of the control end of the driving module 102, and the more charge written to the first end of the light-emitting module 104, so that the initialization degree is reduced, and the initialization degree changes from relatively complete to less complete, for example, the initialization degree changes from relatively complete to medium initialization degree; the smaller the voltage of the previous frame data, the smaller the voltage of the control end of the driving module 102, and the less charge written to the first end of the light-emitting module 104, so that the initialization degree is improved, and the initialization degree changes from relatively incomplete to relatively complete, for example, to medium initialization degree, thereby compensating for the initialization effect of the light-emitting module 104.

[0122] S202: In a first initialization phase, the first initialization module writes an initialization voltage provided by the initialization signal line to the first terminal of the light-emitting module to initialize the light-emitting module. The initialization compensation phase occurs before or after the first initialization phase, or the initialization compensation phase partially overlaps or coincides with the initialization phase.

[0123] Specifically, in the first initialization stage, the first initialization module 105 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light-emitting module 104 to initialize the light-emitting module 104. Since the charge is written to the first end of the light-emitting module 104 in advance, the initialization degree of the light-emitting module 104 in each frame tends to be consistent.

[0124] S203 , in the data writing phase, the data writing module writes the data voltage provided by the data line into the driving module.

[0125] Specifically, in the data writing phase, the data writing module 101 writes the data voltage Vdata into the driving module 102 .

[0126] S204 , in the light-emitting stage, the driving module generates a driving current according to the data voltage, and the light-emitting module emits light in response to the driving current.

[0127] Specifically, during the light-emitting phase, the driver module 102 generates a driving current based on the first power supply voltage Vdd and the data voltage Vdata, and the light-emitting module 104 emits light in response to the driving current. The initialization level of the light-emitting module 104 is consistent in each frame, so the driving current used by the light-emitting module 104 during each frame is consistent. This, in turn, results in consistent brightness across each frame. This reduces the brightness difference between the first and subsequent frames of the light-emitting module 104 after switching between screens, thereby improving the display quality of the display panel.

[0128] On the basis of the above implementation plan, Figure 12 is a flowchart of another pixel circuit driving method provided by an embodiment of the present invention. Figure 12 The driving method shown is used to drive Figure 2 or Figure 3 The pixel circuit shown, optionally, refers to Figure 2 、 Figure 3 and Figure 12 , the driving method of the pixel circuit includes:

[0129] S301 , in an initialization compensation stage, the initialization compensation module writes the voltage of the control terminal of the driving module stored in the storage module into the first terminal of the light-emitting module.

[0130] S302 : In a second initialization phase, the second initialization module writes the initialization voltage provided by the initialization signal line into the control terminal of the driving module to initialize the control terminal of the driving module.

[0131] The initialization compensation phase precedes the second initialization phase, or the second initialization phase and the initialization compensation phase are in the same time period. Alternatively, the first initialization phase may precede, follow, or be simultaneous with the second initialization phase. Optionally, the initialization compensation phase overlaps with the overlapping time period of the first and second initialization phases.

[0132] Specifically, the initialization compensation module 106 can compensate the first terminal of the light-emitting module 104 before the second initialization phase. Before the second initialization phase, the control terminal of the driver module 102 still maintains the voltage of the previous frame. The initialization compensation module 106 can write the voltage of the previous frame (the voltage of the control terminal of the driver module 102, which is related to the data voltage of the previous frame) to the first terminal of the light-emitting module 104, thereby writing a charge to the first terminal of the light-emitting module 104. The larger the data voltage of the previous frame, the larger the voltage of the control terminal of the driver module 102, and the more charge written to the first terminal of the light-emitting module 104, thereby reducing the degree of initialization, and changing the degree of initialization from relatively complete to less complete, for example, from relatively complete to medium initialization. The smaller the data voltage of the previous frame, the smaller the voltage of the control terminal of the driver module 102, and the less charge written to the first terminal of the light-emitting module 104, thereby increasing the degree of initialization, and changing the degree of initialization from relatively incomplete to relatively complete, for example, to medium initialization. This compensates for the initialization effect of the light-emitting module 104, so that the degree of initialization of the light-emitting module 104 tends to be consistent in each frame.

[0133] In some other embodiments, the initialization compensation module 106 may also compensate the first terminal of the light-emitting module 104 during the second initialization phase. During the second initialization phase, the second initialization module 107 writes an initialization voltage to the control terminal of the driver module 102. However, writing the initialization voltage takes some time. Therefore, during the process of writing the initialization voltage, the control terminal of the driver module 102 still maintains a portion of the charge of the voltage of the previous frame (related to the data voltage of the previous frame), thereby writing charge to the first terminal of the light-emitting module 104. The larger the data voltage of the previous frame, the larger the voltage of the control terminal of the driver module 102, and the more charge written to the first terminal of the light-emitting module 104, thereby reducing the degree of initialization, and changing the degree of initialization from relatively complete to less complete, for example, from relatively complete to medium initialization. The smaller the data voltage of the previous frame, the smaller the voltage of the control terminal of the driver module 102, and the less charge written to the first terminal of the light-emitting module 104, thereby improving the degree of initialization, and changing the degree of initialization from relatively incomplete to relatively complete, for example, to medium initialization. This compensates for the initialization effect of the light-emitting module 104, making the initialization degree of the light-emitting module 104 consistent in each frame.

[0134] S303 . In a first initialization phase, the first initialization module writes the initialization voltage provided by the initialization signal line into the first end of the light-emitting module to initialize the light-emitting module.

[0135] S304 , in the data writing phase, the data writing module writes the data voltage provided by the data line into the driving module.

[0136] S305 , in the light-emitting stage, the driving module generates a driving current according to the data voltage, and the light-emitting module emits light in response to the driving current.

[0137] The technical solution of the embodiment of the present invention further provides a display panel, which includes the pixel circuit provided by any of the above embodiments. Figure 13 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, with reference to Figure 13 The display panel can be applied to mobile phones, tablets, monitors, smart watches, MP3, MP4, VR, AR or other wearable devices, etc., because it includes the pixel circuit provided by any embodiment of the present invention, and thus has the same beneficial effects, which will not be repeated here.

[0138] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0139] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A pixel circuit, characterized in that: include: A data writing module, a driving module, a storage module, a light emitting module, a first initialization module and an initialization compensation module; The data writing module is connected between the driving module and the data line, and is used to transmit the data voltage provided by the data line to the control end of the driving module during the data writing phase; The storage module is connected to the control terminal of the driving module, and the storage module is used to store the voltage of the control terminal of the driving module; The driving module is connected to the first end of the light emitting module, and is used to generate a driving current in a light emitting stage to drive the light emitting module to emit light; The first initialization module is connected between the initialization signal line and the first end of the light emitting module, and is used to initialize the first end of the light emitting module in a first initialization phase; The initialization compensation module is connected between the control terminal of the driving module and the first terminal of the light-emitting module, and is used to write the voltage of the control terminal of the driving module into the first terminal of the light-emitting module before the data writing phase; The pixel circuit further includes a second initialization module; A first end of the second initialization module is connected to the initialization signal line, a second end of the second initialization module is connected to the control end of the driving module, and the second initialization module is used to initialize the control end of the driving module in the second initialization phase; The control end of the initialization compensation module is connected to the first scan signal line, and the control end of the second initialization module is connected to the second scan signal line.

2. The pixel circuit according to claim 1, wherein: The initialization compensation module is used to write the voltage of the control terminal of the driving module into the first terminal of the light-emitting module before or after the first initialization phase, or during at least a part of the first initialization phase.

3. The pixel circuit according to claim 1, wherein: The initialization compensation module includes a first transistor; The control electrode of the first transistor is connected to the first scanning signal line, the first electrode of the first transistor is connected to the control end of the driving module, and the second electrode of the first transistor is connected to the first end of the light emitting module.

4. The pixel circuit according to claim 1, wherein: The initialization compensation module includes a first transistor and a first capacitor; The control electrode of the first transistor is connected to the first scanning signal line, the first electrode of the first transistor is connected to the control end of the driving module, and the second electrode of the first transistor is connected to the first end of the light-emitting module through the first capacitor; Alternatively, the control electrode of the first transistor is connected to the first scanning signal line, the first electrode of the first transistor is connected to the control end of the driving module through the first capacitor, and the second electrode of the first transistor is connected to the first end of the light emitting module.

5. The pixel circuit according to claim 4, wherein: The storage module includes a second capacitor; The second capacitor is connected to the control terminal of the driving module; the capacitance of the second capacitor is greater than the capacitance of the first capacitor.

6. The pixel circuit according to any one of claims 1 to 4, characterized in that: The second initialization phase is before the data writing phase; the initialization compensation module is used to write the voltage of the control end of the driving module into the first end of the light-emitting module during the second initialization phase, or, before the second initialization phase, write the voltage of the control end of the driving module into the first end of the light-emitting module.

7. The pixel circuit according to claim 1, wherein: The initialization compensation module is configured to write the voltage of the control terminal of the driving module into the first terminal of the light emitting module during an overlapping period of the first initialization phase and the second initialization phase.

8. The pixel circuit according to claim 1, wherein: The second scanning signal line and the first scanning signal line are the same scanning signal line.

9. The pixel circuit according to claim 1, wherein: The control end of the first initialization module is connected to a fourth scanning signal line; the fourth scanning signal line and the first scanning signal line are the same scanning signal line.

10. The pixel circuit according to claim 1, wherein: The data writing module includes a data writing unit and a threshold compensation unit, wherein the first end of the data writing unit is connected to the data line, and the second end of the data writing unit is connected to the first end of the driving module; the threshold compensation unit is connected between the second end of the driving module and the control end of the driving module, and the threshold compensation unit is used to perform threshold compensation on the driving module.

11. The pixel circuit according to claim 10, wherein: The control end of the data writing unit and the control end of the threshold compensation unit are connected to the third scan signal line.

12. The pixel circuit according to claim 1, wherein: The pixel circuit further includes a first light-emitting control module and a second light-emitting control module; the first end of the driving module is connected to the first power supply through the first light-emitting control module, and the second end of the driving module is connected to the first end of the light-emitting module through the second light-emitting control module; The control end of the first light emitting control module and the control end of the second light emitting control module are connected to a light emitting control signal line. The first light emitting control module and the second light emitting control module are used to control whether the driving current is transmitted to the light emitting module.

13. A method for driving a pixel circuit, characterized in that: Used to drive the pixel circuit according to any one of claims 1 to 12; the pixel circuit includes a data writing module, a driving module, a storage module, a light emitting module, a first initialization module and an initialization compensation module; The data writing module is connected between the driving module and the data line, the storage module is electrically connected to the control terminal of the driving module; the driving module is electrically connected to the first terminal of the light-emitting module; the first initialization module is connected between the initialization signal line and the first terminal of the light-emitting module; the initialization compensation module is connected between the control terminal of the driving module and the first terminal of the light-emitting module; The driving method includes: In the initialization compensation stage, the initialization compensation module writes the voltage of the control terminal of the driving module into the first terminal of the light-emitting module; In a first initialization phase, the first initialization module writes the initialization voltage provided by the initialization signal line into the first end of the light-emitting module to initialize the light-emitting module; wherein the initialization compensation phase is before or after the first initialization phase, or the initialization compensation phase partially overlaps or coincides with the first initialization phase; In the data writing phase, the data writing module writes the data voltage provided by the data line into the driving module; In the light emitting stage, the driving module generates a driving current according to the data voltage, and the light emitting module emits light in response to the driving current.

14. The driving method according to claim 13, wherein: The pixel circuit further includes a second initialization module; A first end of the second initialization module is connected to the initialization signal line, and a second end of the second initialization module is connected to the control end of the driving module; The driving method further includes: In the second initialization phase, the second initialization module writes the initialization voltage provided by the initialization signal line into the control end of the driving module to initialize the control end of the driving module; wherein the initialization compensation phase is before the second initialization phase, or the second initialization phase and the initialization compensation phase are in the same time period.

15. The driving method according to claim 14, wherein: The initialization compensation phase overlaps with an overlapping period of the first initialization phase and the second initialization phase.

16. A display panel, characterized in that: The pixel circuit comprises the pixel circuit according to any one of claims 1 to 12.

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