Display panel, driving method thereof, and display device

Abstract

The embodiment of the present invention discloses a display panel, a driving method thereof, and a display device. The display panel includes a pixel circuit and a voltage transmission line corresponding to the pixel circuit; the pixel circuit includes a storage module, a switch module, a driving module, and a light-emitting module. The voltage transmission line is connected to the first end of the storage module in the pixel circuit, and the voltage transmission line is used to transmit a compensation voltage to the first end of the storage module before the light-emitting stage; the switch module is used to transmit the voltage on the first power line to the first end of the storage module during the light-emitting stage; the storage module is used to compensate the voltage of the control end of the driving module according to the voltage change of its own first end during the light-emitting stage, so as to compensate for the voltage drop on the first power line. The technical solution of the embodiment of the present invention helps to compensate for the influence of the voltage drop on the first power line on the driving current generated by the driving module, thereby improving the uniformity of display brightness.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel, a driving method thereof, and a display device. Background Art

[0002] With the continuous development of display technology, people's requirements for the display quality of display panels are becoming increasingly higher. Display panels include pixel circuits and power lines that supply power to the pixel circuits. Due to voltage drops on the power lines, the display panels may experience uneven display brightness, thus affecting the display quality. Summary of the Invention

[0003] The present invention provides a display panel, a driving method thereof, and a display device, so as to compensate for the influence of a voltage drop on a first power line on a driving current, thereby improving display brightness uniformity.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, comprising a pixel circuit and a voltage transmission line corresponding to the pixel circuit;

[0005] The pixel circuit includes a storage module, a switch module, a driving module and a light-emitting module, the voltage transmission line is connected to the first end of the storage module in the pixel circuit, and the voltage transmission line is used to transmit a compensation voltage to the first end of the storage module before the light-emitting stage;

[0006] The switch module is connected between the first end of the storage module and the first power line, and is used to transmit the voltage on the first power line to the first end of the storage module during the light-emitting phase;

[0007] The second end of 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 and compensate the voltage of the control end of the driving module according to the voltage change of the first end thereof during the light-emitting stage, so as to compensate for the voltage drop on the first power line;

[0008] The driving module is connected between the first power line and the light-emitting module, and is used to drive the light-emitting module to emit light according to the voltage of its control terminal during the light-emitting stage;

[0009] The compensation voltage transmitted to the first end of the storage module through the voltage transmission line is different from the voltage transmitted to the first end of the storage module through the first power line during the light-emitting stage, so that the voltage of the first end of the storage module changes during the light-emitting stage.

[0010] Optionally, the voltages connected to the first power line and the voltage transmission line are both a first power supply voltage, and the first power supply voltage is a high-level signal;

[0011] Preferably, the display panel includes multiple rows of pixel circuits and multiple voltage transmission lines, and the multiple rows of pixel circuits are arranged in a one-to-one correspondence with the multiple voltage transmission lines, and each voltage transmission line is connected to the first end of the storage module in a corresponding row of pixel circuits.

[0012] Optionally, the pixel circuit further includes a light emitting control module and a second power line, the light emitting control module, the driving module, and the light emitting module are connected in series between the first power line and the second power line, a control end of the light emitting control module receives a first light emitting control signal, and the light emitting control module is configured to be turned on or off in response to the first light emitting control signal;

[0013] The control end of the switch module receives the first light-emitting control signal, and the switch module is turned on in the light-emitting phase in response to the first light-emitting control signal to transmit the voltage on the first power line to the first end of the storage module;

[0014] Preferably, the switch module includes a first transistor, a gate of the first transistor is connected to the first light-emitting control signal, a first electrode of the first transistor is connected to the first power line, and a second electrode of the first transistor is connected to the first end of the storage module;

[0015] Preferably, the light emitting control module includes a second transistor, a gate of the second transistor is connected to the first light emitting control signal, and the second transistor is connected between the first power line and the second power line.

[0016] Optionally, the display panel has a display area and a non-display area, the display area includes a plurality of rows of the pixel circuits, and the display panel further includes a plurality of rows of light emitting control circuits located in the non-display area, and each row of the pixel circuits is correspondingly provided with a light emitting control circuit and a voltage transmission line;

[0017] The light-emitting control circuit includes a first output terminal and a second output terminal, the first output terminal of the light-emitting control circuit being connected to the control terminal of the switch module in the corresponding row of pixel circuits, and the light-emitting control circuit being configured to output a first light-emitting control signal to the control terminal of the switch module in the corresponding row of pixel circuits, so that the switch module is turned on in a light-emitting phase in response to the first light-emitting control signal, and transmits the voltage on the first power line to the first terminal of the storage module;

[0018] The second output end of the light-emitting control circuit is connected to the first end of the storage module in the corresponding row of pixel circuits through the voltage transmission line, and the light-emitting control circuit is also used to transmit the compensation voltage to the first end of the storage module through the voltage transmission line before the light-emitting stage.

[0019] Optionally, the light emitting control circuit includes a light emitting control signal generating circuit and a compensation control module;

[0020] The output end of the light emitting control signal generating circuit is connected to the control end of the switch module in the corresponding row of pixel circuits as the first output end, and the light emitting control signal generating circuit is used to generate the first light emitting control signal;

[0021] The compensation control module is connected to the output end of the light-emitting control signal generating circuit and the compensation voltage line, and the output end of the compensation control module is connected to the voltage transmission line as the second output end. The compensation control module is used to transmit the voltage on the compensation voltage line to the voltage transmission line before the light-emitting stage according to the first light-emitting control signal.

[0022] Optionally, the compensation control module includes an inverting unit and a switch unit;

[0023] The inverting unit is connected between the output terminal of the light emitting control signal generating circuit and the control terminal of the switch unit, and is used to invert the phase of the first light emitting control signal and output it to the control terminal of the switch unit;

[0024] The switch unit is connected between the compensation voltage line and the voltage transmission line, and is configured to be turned on before the light-emitting phase in response to a signal from its control terminal, so as to transmit the voltage on the compensation voltage line to the voltage transmission line;

[0025] Preferably, the inverting unit includes a third transistor and a fourth transistor, and the switching unit includes a fifth transistor;

[0026] The gate of the third transistor is connected to the output end of the light emitting control signal generating circuit, the first electrode of the third transistor is connected to the first level signal, and the second electrode of the third transistor is connected to the gate of the fifth transistor;

[0027] The gate of the fourth transistor is connected to the first electrode of the fourth transistor, the first electrode of the fourth transistor is connected to the second level signal, and the second electrode of the fourth transistor is connected to the gate of the fifth transistor; wherein one of the first level signal and the second level signal is a high level signal and the other is a low level signal, and the second level signal is a signal for controlling the conduction of the fourth transistor;

[0028] A first electrode of the fifth transistor is connected to the compensation voltage line, and a second electrode of the fifth transistor is connected to the voltage transmission line.

[0029] Optionally, the compensation voltage line extends in the non-display area along a direction where an edge of the display area is located;

[0030] The display panel further includes a first bonding connection portion and a second bonding connection portion located in the non-display area, the first bonding connection portion being connected to the first power line, the second bonding connection portion being connected to the compensation voltage line, and the first bonding connection portion and the second bonding connection portion being respectively connected to the first power supply voltage; or

[0031] The display panel further includes a bonding connection portion located in the non-display area, wherein the bonding connection portion is connected to a first power supply voltage and is respectively connected to the first power supply line and the compensation voltage line.

[0032] Optionally, the pixel circuit further includes a second power line, the driving module includes a driving transistor, the storage module includes a storage capacitor, and the light-emitting module includes a light-emitting device; the driving transistor and the light-emitting device are connected in series between the first power line and the second power line, a first electrode of the storage capacitor is connected to the voltage transmission line, and a second electrode of the storage capacitor is connected to the gate of the driving transistor;

[0033] Preferably, the pixel circuit further comprises a data writing module, a first end of the data writing module is connected to the data voltage, a second end of the data writing module is connected to the driving module, and the data writing module is used to write the data voltage to the driving module;

[0034] Preferably, the pixel circuit further comprises a threshold compensation module, the second end of the data writing module is connected to the first end of the driving module, the threshold compensation module is connected between the second end of the driving module and the control end, and the threshold compensation module is used to compensate for the threshold voltage of the driving module;

[0035] Preferably, the pixel circuit further comprises an initialization module, a first terminal of the initialization module is connected to an initialization voltage, a second terminal of the initialization module is connected to a control terminal of the driving module, and the initialization module is used to write the initialization voltage to the control terminal of the driving module;

[0036] Preferably, the pixel circuit further comprises a reset module, a first end of the reset module is connected to a reset voltage, a second end of the reset module is connected to the first end of the light emitting module, and the reset module is used to write the reset voltage to the first end of the light emitting module;

[0037] Preferably, the initialization voltage and the reset voltage are the same voltage.

[0038] In a second aspect, an embodiment of the present invention provides a method for driving a display panel, wherein the display panel includes a pixel circuit and a voltage transmission line corresponding to the pixel circuit; the pixel circuit includes a storage module, a switch module, a driving module, and a light-emitting module, the voltage transmission line being connected to a first end of the storage module in the pixel circuit; the switch module being connected between the first end of the storage module and a first power line; a second end of the storage module being connected to a control end of the driving module, the storage module being configured to store a voltage at the control end of the driving module; and the driving module being connected between the first power line and the light-emitting module;

[0039] The driving method of the display panel includes:

[0040] transmitting a compensation voltage to the first end of the storage module through the voltage transmission line before the light emitting stage;

[0041] transmitting the voltage on the first power line to the first end of the storage module through the switch module during the light-emitting phase;

[0042] The storage module compensates the voltage of the control terminal of the driving module according to the voltage change of the first terminal thereof during the light-emitting phase, so as to compensate for the voltage drop on the first power line;

[0043] The driving module drives the light emitting module to emit light according to the voltage of its control terminal during the light emitting stage;

[0044] The compensation voltage transmitted to the first end of the storage module through the voltage transmission line is different from the voltage transmitted to the first end of the storage module through the first power line during the light-emitting stage, so that the voltage of the first end of the storage module changes during the light-emitting stage.

[0045] In a third aspect, an embodiment of the present invention provides a display device, comprising the display panel described in the first aspect.

[0046] The display panel, driving method thereof, and display device provided by embodiments of the present invention transmit a compensation voltage to the first terminal of a storage module in a corresponding pixel circuit via a voltage transmission line before a light-emitting phase, and transmit the voltage on a first power line to the first terminal of the storage module via a switch module during the light-emitting phase, such that the voltage change at the first terminal of the storage module is the difference between the voltage on the first power line and the compensation voltage. Since there is a voltage drop on the first power line, the voltage change at the first terminal of the storage module includes the voltage drop on the first power line. During the light-emitting phase, the storage module compensates for the voltage at the control terminal of the driver module based on the voltage change at its first terminal, such that the voltage at the control terminal of the driver module includes the voltage drop on the first power line, and the voltage at the first terminal of the driver module also includes the voltage drop on the first power line. This helps compensate for the effect of the voltage drop on the first power line on the voltage difference between the control terminal and the first terminal of the driver module, thereby compensating for the effect of the voltage drop on the first power line on the drive current generated by the driver module. Since the voltage transmission lines are arranged correspondingly to the pixel circuits, this solution can compensate row by row for the effect of the voltage drop on the first power line on the driving current generated by the driving module in each row of pixel circuits, thereby improving the display brightness uniformity of the display panel and thereby improving the overall display effect.

[0047] 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

[0048] 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.

[0049] Figure 1 is a structural schematic diagram of a display panel provided by an embodiment of the present invention;

[0050] Figure 2 is a structural schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0051] Figure 3 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0052] Figure 4 is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0053] Figure 5is a structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0054] Figure 6 is a structural diagram of another display panel provided by an embodiment of the present invention;

[0055] Figure 7 This is a structural diagram of a light-emitting control circuit provided by an embodiment of the present invention;

[0056] Figure 8 This is a driving timing diagram provided by an embodiment of the present invention;

[0057] Figure 9 This is a structural diagram of a light-emitting control circuit provided by an embodiment of the present invention;

[0058] Figure 10 This is a structural diagram of a light-emitting control circuit provided by an embodiment of the present invention;

[0059] Figure 11 It is a flow chart of a method for driving a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] 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.

[0061] 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 terms "including" and "having" 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.

[0062] As described in the background art, existing display panels have the problem of uneven display brightness. The inventors have discovered that the cause of this problem is that the display panel includes a pixel circuit, and the driving transistor and light-emitting device in the pixel circuit are connected in series between a first power line and a second power line. During the light-emitting phase, the discharge path between the first power line and the second power line is conductive, and the driving transistor generates a driving current, driving the light-emitting device to emit light. The magnitude of the driving current generated by the driving transistor is related to the voltage on the first power line. Since the driving current flows through the first power line, a voltage drop (IR drop) occurs on the first power line, thereby affecting the magnitude of the driving current and the display effect. The voltage drop on the first power line varies between different display areas, which can cause the display panel to have uneven display brightness. Furthermore, the larger the size of the display panel, the larger the driving current corresponding to the same display brightness, the larger the voltage drop on the first power line, the greater the impact on the display effect, and the more serious the problem of uneven display brightness.

[0063] In view of the above problems, an embodiment of the present invention provides a display panel. Figure 1 It is a structural schematic diagram of a display panel provided by an embodiment of the present invention. Figure 2 This is a schematic structural diagram of a pixel circuit provided by an embodiment of the present invention. Figure 2 The pixel circuit shown can be Figure 1 The pixel circuit 10 in combination Figure 1 and Figure 2 The display panel includes a pixel circuit 10 and a voltage transmission line 20 corresponding to the pixel circuit 10.

[0064] The pixel circuit 10 includes a storage module 110, a switching module 120, a driving module 130 and a light-emitting module 140. The voltage transmission line 20 is connected to the first end of the storage module 110 in the pixel circuit 10. The voltage transmission line 20 is used to transmit a compensation voltage to the first end of the storage module 110 before the light-emitting stage.

[0065] The switch module 120 is connected between the first end of the storage module 110 and the first power line 30 . The switch module 120 is configured to transmit the voltage on the first power line 30 to the first end of the storage module 110 during the light-emitting phase.

[0066] The second end of the storage module 110 is connected to the control end of the driving module 130. The storage module 110 is used to store the voltage of the control end of the driving module 130 and compensate the voltage of the control end of the driving module 130 according to the voltage change of its first end during the light-emitting stage to compensate for the voltage drop on the first power line 30.

[0067] The driving module 130 is connected between the first power line 30 and the light emitting module 140 . The driving module 130 is used to drive the light emitting module 140 to emit light according to the voltage of its control terminal during the light emitting phase.

[0068] Among them, the compensation voltage transmitted to the first end of the storage module 110 through the voltage transmission line 20 is different from the voltage transmitted to the first end of the storage module 110 through the first power line 30 during the light-emitting stage, so that the voltage of the first end of the storage module 110 changes during the light-emitting stage.

[0069] Specifically, the display panel may include multiple rows of pixel circuits 10 and multiple voltage transmission lines 20. The multiple rows of pixel circuits 10 are arranged in a one-to-one correspondence with the multiple voltage transmission lines 20, and each voltage transmission line 20 is connected to the first end of the storage module 110 in a corresponding row of pixel circuits 10. The voltage transmission lines 20 may extend along the row direction in which the pixel circuits 10 are arranged, and the first end of the storage module 110 in each row of pixel circuits 10 is connected to a corresponding voltage transmission line 20. The compensation voltage transmitted by the voltage transmission line 20 is a fixed voltage. This fixed voltage can be used to compensate for the voltage at the control terminal of the driving module 130, thereby compensating for the effect of the voltage drop on the first power line 30 on the driving current generated by the driving module 130.

[0070] The driver module 130 and the light-emitting module 140 are sequentially connected in series between the first power line 30 and the second power line 40. Optionally, the voltages connected to the first power line 30 and the voltage transmission line 20 are both the first power supply voltage VDD, with the first power supply voltage VDD being a high-level signal. That is, the first power line 30 is connected to the first power supply voltage VDD, and the compensation voltage transmitted by the voltage transmission line 20 is also the first power supply voltage VDD. The second power line 40 is connected to the second power supply voltage VSS, with the second power supply voltage VSS being a low-level signal. The first power supply voltage VDD is a positive voltage, while the second power supply voltage VSS is a negative voltage or 0V.

[0071] Optionally, the pixel circuit 10 further includes a data writing module 150. A first terminal of the data writing module 150 is connected to the data voltage Vdata, and a second terminal of the data writing module 150 is connected to the driving module 130. The data writing module 150 is configured to write the data voltage Vdata to the driving module 130. For example, the second terminal of the data writing module 150 may be connected to a control terminal of the driving module 130 so that the data voltage Vdata is written to the control terminal of the driving module 130 via the data writing module 150.

[0072] In each embodiment of the present invention, the compensation voltage transmitted by the voltage transmission line 20 is described as the first power supply voltage VDD. Exemplarily, the working phase of the pixel circuit 10 includes at least a data writing phase and a light emitting phase.

[0073] In the data writing phase, the data writing module 150 is controlled to be turned on, so as to write the data voltage Vdata to the control terminal of the driving module 130 through the data writing module 150, so that the voltage V G =Vdata. The compensation voltage, namely the first power supply voltage VDD, is transmitted to the first terminal of the storage module 110 via the voltage transmission line 20. Since the voltage transmission line 20 is only a signal transmission line for transmitting voltage, the current on the voltage transmission line 20 is small, so the voltage drop on the voltage transmission line 20 is small or even negligible. Therefore, the voltage of the N node can be expressed as: V N =VDD.

[0074] During the light-emitting phase, the control switch module 120 is turned on to transmit the first power supply voltage VDD on the first power supply line 30 to the first end of the storage module 110 through the switch module 120. The discharge path between the first power supply line 30 and the second power supply line 40 is turned on, and the driving module 130 generates a driving current based on the voltage difference between its own control end and the first end to drive the light-emitting module 140 to emit light. Since the driving current flows through the first power supply line 30, there is a voltage drop in the first power supply voltage VDD on the first power supply line 30. Although the voltage connected to the first power supply line 30 and the voltage transmission line 20 is the same, due to the voltage drop in the first power supply voltage VDD on the first power supply line 30, the voltages transmitted to the first end of the storage module 110 through the two are not the same. The voltage of the S node should actually be the first power supply voltage VDD including this voltage drop. The voltage of the S node can be expressed as V S =VDD+Vdrop, where Vdrop is the voltage drop generated by the first power supply voltage VDD on the first power line 30, and VDD represents the first power supply voltage excluding the voltage drop. The voltage transmitted from the switch module 120 to the first terminal of the storage module 110 is equal to the voltage of the S node, that is, the voltage of the N node V N =V S =VDD+Vdrop. Voltage change of N node △V N =VDD+Vdrop-VDD=Vdrop. The storage module 110 has a coupling function and can couple the voltage of the control terminal of the driving module 130 according to the voltage change of its first terminal, so that the voltage of the G node V G =Vdata+△V N =Vdata+Vdrop. The magnitude of the driving current generated by the driving module 130 is related to the voltage difference V between the control terminal and the first terminal of the driving module 130. GS Related, where V GS =V G -V S =Vdata+Vdrop-VDD-Vdrop=Vdata-VDD, so V GSThe driving current generated by the driving module 130 is independent of the voltage drop Vdrop generated by the first power supply voltage VDD on the first power supply line 30, and is independent of the voltage drop Vdrop generated by the first power supply voltage VDD on the first power supply line 30, thereby compensating for the influence of the voltage drop Vdrop on the first power supply line 30 on the driving current generated by the driving module 130.

[0075] When the display panel includes n rows of pixel circuits 10, the pixel circuits 10 in rows 1 to n can be scanned row by row. Before the light-emitting phase of the pixel circuits 10 in the first row, the compensation voltage is transmitted to the first terminal of the storage module 110 via the voltage transmission line 20 corresponding to the pixel circuits 10 in the first row. During the light-emitting phase of the pixel circuits 10 in the first row, the voltage on the first power line 30 is transmitted to the first terminal of the storage module 110 via the switch module 120. The storage module 110 then compensates the voltage at the control terminal of the driver module 130 based on the voltage change at its first terminal, thereby compensating for the effect of the voltage drop on the first power line 30 on the drive current generated by the driver module 130 in the pixel circuits 10 in the first row. Before the second row of pixel circuits 10 begin their light-emitting phase, a compensation voltage is transmitted to the first terminal of the storage module 110 via the voltage transmission line 20 corresponding to the second row of pixel circuits 10. During the second row of pixel circuits 10 begin their light-emitting phase, the voltage on the first power line 30 is transmitted to the first terminal of the storage module 110 via the switch module 120. The storage module 110 then compensates for the voltage at the control terminal of the driver module 130 based on the voltage change at its first terminal, thereby compensating for the effect of the voltage drop on the first power line 30 on the drive current generated by the driver module 130 in the second row of pixel circuits 10. Similarly, the pixel circuits 10 in rows 3 to n are scanned row by row, thereby compensating for the effect of the voltage drop on the first power line 30 on the drive current generated by the driver module 130 in each row of pixel circuits 10.

[0076] The technical solution of an embodiment of the present invention transmits a compensation voltage to the first terminal of a storage module in a corresponding pixel circuit via a voltage transmission line before the light-emitting phase. The switch module transmits the voltage on the first power line to the first terminal of the storage module during the light-emitting phase, so that the voltage change at the first terminal of the storage module is the difference between the voltage on the first power line and the compensation voltage. Since there is a voltage drop on the first power line, the voltage change at the first terminal of the storage module includes the voltage drop on the first power line. During the light-emitting phase, the storage module compensates for the voltage at the control terminal of the driver module based on the voltage change at its first terminal, so that the voltage at the control terminal of the driver module includes the voltage drop on the first power line, and the voltage at the first terminal of the driver module also includes the voltage drop on the first power line. This helps compensate for the effect of the voltage drop on the first power line on the voltage difference between the control terminal and the first terminal of the driver module, thereby compensating for the effect of the voltage drop on the first power line on the drive current generated by the driver module. Because the voltage transmission line is arranged in correspondence with the pixel circuit, this solution can compensate for the effect of the voltage drop on the first power line on the drive current generated by the driver module in each row of pixel circuits on a row-by-row basis, thereby improving the brightness uniformity of the display panel and thereby enhancing the overall display effect.

[0077] Figure 3 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Figure 3 Optionally, the driving module 130 includes a driving transistor DT, the storage module 110 includes a storage capacitor Cst, and the light-emitting module 140 includes a light-emitting device D1. The driving transistor DT and the light-emitting device D1 are connected in series between the first power line 30 and the second power line 40, the first electrode of the storage capacitor Cst is connected to the voltage transmission line 20, and the second electrode of the storage capacitor Cst is connected to the gate of the driving transistor DT. The data writing module 150 includes a sixth transistor T6, the first electrode of the sixth transistor T6 is connected to the data voltage Vdata, and the second electrode of the sixth transistor T6 is connected to the gate of the driving transistor DT. The light-emitting device D1 includes an organic light-emitting diode (OLED), an active matrix organic light-emitting diode (AMOLED), and a micron-sized light-emitting diode (Micro-LED).

[0078] Figure 4 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Figure 4Optionally, the pixel circuit further includes a light-emitting control module 160. The light-emitting control module 160, the driving module 130, and the light-emitting module 140 are connected in series between the first power line 30 and the second power line 40. The control terminal of the light-emitting control module 160 receives a first light-emitting control signal EM, and the light-emitting control module 160 is configured to turn on or off in response to the first light-emitting control signal EM. The control terminal of the switch module 120 receives the first light-emitting control signal EM. The switch module 120 turns on in the light-emitting phase in response to the first light-emitting control signal EM, thereby transmitting the voltage on the first power line 30 to the first terminal of the storage module 110.

[0079] Specifically, Figure 4 The light control module 160 is shown connected in series between the first power line 30 and the driver module 130, and also between the driver module 130 and the light-emitting module 140. In other embodiments, the light control module 160 may be connected in series only between the first power line 30 and the driver module 130, or only between the driver module 130 and the light-emitting module 140. In response to the first light control signal EM, the light control module 160 can be turned on during the light-emitting phase to control the discharge path between the first power line 30 and the second power line 40 to be conductive during the light-emitting phase, causing the driver module 130 to drive the light-emitting module 140 to emit light. The first light control signal EM can also control the switch module 120 to be turned on or off, allowing the light control module 160 and the switch module 120 to be controlled by the same first light control signal EM, eliminating the need for additional signals to control the switch module 120. This helps reduce the number of signal lines connected to the pixel circuit, thereby reducing the number of signal lines in the display panel and simplifying the wiring layout of the display panel.

[0080] Continue to see Figure 4 Optionally, the switch module 120 includes a first transistor T1, a gate of the first transistor T1 receiving a first light emission control signal EM, a first electrode of the first transistor T1 connected to the first power line 30, and a second electrode of the first transistor T1 connected to the first end of the storage module 110. The light emission control module 160 includes a second transistor T2, a gate of the second transistor T2 receiving the first light emission control signal EM, and the second transistor T2 connected between the first power line 30 and the second power line 40. Because the first transistor T1 and the second transistor T2 have the same conduction phase, the first transistor T1 and the second transistor T2 can be both P-type transistors or both N-type transistors, so that the first transistor T1 and the second transistor T2 can be controlled by the same first light emission control signal EM. Figure 4The diagram shows a situation in which the first electrode of the second transistor T2 is connected to the first power line 30, and the second electrode of the second transistor T2 is connected to the first end of the driving module 130. On this basis, optionally, the light-emitting control module 160 further includes a seventh transistor T7, the gate of the seventh transistor T7 is connected to the first light-emitting control signal EM, the first electrode of the seventh transistor T7 is connected to the second end of the driving module 130, the second electrode of the seventh transistor T7 is connected to the first end of the light-emitting module 140, and the type of the seventh transistor T7 is the same as that of the second transistor T2.

[0081] Continue to see Figure 4 Optionally, the pixel circuit 10 further includes a data writing module 150, a threshold compensation module 170, an initialization module 180, and a reset module 190. The second end of the data writing module 150 is connected to the first end of the driving module 130, and the threshold compensation module 170 is connected between the second end and the control end of the driving module 130. The threshold compensation module 170 is used to compensate for the threshold voltage of the driving module 130. The first end of the initialization module 180 is connected to the initialization voltage Vref, and the second end of the initialization module 180 is connected to the control end of the driving module 130. The initialization module 180 is used to write the initialization voltage Vref to the control end of the driving module 130. The first end of the reset module 190 is connected to the reset voltage V0, and the second end of the reset module 190 is connected to the first end of the light-emitting module 140. The reset module 190 is used to write the reset voltage V0 to the first end of the light-emitting module 140.

[0082] Specifically, during the initialization phase, the initialization module 180 and the reset module 190 are controlled to be turned on, and the initialization voltage Vref is written to the control terminal of the driver module 130 via the initialization module 180 to initialize the voltage at the control terminal of the driver module 130. The driver module 130 is then controlled to be turned on, and the reset voltage V0 is written to the first terminal of the light-emitting module 140 via the reset module 190 to reset the voltage at the first terminal of the light-emitting module 140. During the data writing phase, the data writing module 150 and the threshold compensation module 170 are controlled to be turned on, so that the data voltage Vdata is written to the control terminal of the driver module 130 in sequence through the data writing module 150, the driver module 130, and the threshold compensation module 170. Simultaneously, the threshold voltage of the driver module 130 is compensated by the threshold compensation module 170.

[0083] Alternatively, the initialization voltage Vref and the reset voltage V0 may be different voltages. Figure 4 The situation where the initialization voltage Vref and the reset voltage V0 are different is shown. In this way, the voltage values ​​of the initialization voltage Vref and the reset voltage V0 can be set separately, which helps to improve the voltage initialization effect of the control end of the driving module 130 and the voltage reset effect of the first end of the light-emitting module 140, thereby improving the display effect.

[0084] Figure 5 is a structural diagram of another pixel circuit provided by an embodiment of the present invention. Figure 5 Alternatively, in another embodiment, the initialization voltage Vref and the reset voltage V0 may be the same voltage. This arrangement has the advantage of enabling the voltage initialization of the control terminal of the driver module 130 and the voltage reset of the first terminal of the light-emitting module 140 to be achieved using the same voltage. This eliminates the need to provide separate signal terminals for the initialization voltage Vref and the reset voltage V0 in the display panel, thereby reducing the number of signal terminals in the display panel.

[0085] Continue to see Figure 5 Furthermore, the data writing module 150 includes a sixth transistor T6, the threshold compensation module 170 includes an eighth transistor T8, the initialization module 180 includes a ninth transistor T9, and the reset module 190 includes a tenth transistor T10. The gate of the sixth transistor T6 is connected to the second scanning signal S2, the first electrode of the sixth transistor T6 is connected to the data voltage Vdata, and the second electrode of the sixth transistor T6 is connected to the first electrode of the driving transistor DT. The gate of the eighth transistor T8 is connected to the second scanning signal S2, the first electrode of the eighth transistor T8 is connected to the second electrode of the driving transistor DT, and the second electrode of the eighth transistor T8 is connected to the gate of the driving transistor DT. The gate of the ninth transistor T9 is connected to the first scanning signal S1, the first electrode of the ninth transistor T9 is connected to the initialization voltage Vref, and the second electrode of the ninth transistor T9 is connected to the gate of the driving transistor DT. The gate of the tenth transistor T10 is connected to the third scanning signal S3, the first electrode of the tenth transistor T10 is connected to the reset voltage V0, and the second electrode of the tenth transistor T10 is connected to the first electrode of the light-emitting device D1. Each transistor in the pixel circuit can be either a P-type transistor or an N-type transistor. Figure 4 、 Figure 5 The example only schematically illustrates the case where all transistors in the pixel circuit are P-type transistors. The embodiment of the present invention does not limit the type of transistors in the pixel circuit.

[0086] Figure 6 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Figure 7 It is a structural schematic diagram of a light emitting control circuit provided by an embodiment of the present invention. Figure 7 The light emitting control circuit shown can be Figure 6 The light emitting control circuit 50 in combination Figures 5 to 7 Furthermore, the display panel has a display area 100 and a non-display area 200. The display area 100 includes multiple rows of pixel circuits 10. The display panel also includes multiple rows of light-emitting control circuits 50 located in the non-display area 200. Each row of pixel circuits 10 is correspondingly provided with a light-emitting control circuit 50 and a voltage transmission line 20.

[0087] The light-emission control circuit 50 includes a first output terminal O1 and a second output terminal O2. The first output terminal O1 of the light-emission control circuit 50 is connected to the control terminal of the switch module 120 in the corresponding row of pixel circuits 10. The light-emission control circuit 50 is configured to output a first light-emission control signal EM to the control terminal of the switch module 120 in the corresponding row of pixel circuits 10, causing the switch module 120 to conduct during the light-emission phase in response to the first light-emission control signal EM and transmit the voltage on the first power line 30 to the first terminal of the storage module 110. The second output terminal O2 of the light-emission control circuit 50 is connected to the first terminal of the storage module 110 in the corresponding row of pixel circuits 10 via the voltage transmission line 20. The light-emission control circuit 50 is also configured to transmit a compensation voltage to the first terminal of the storage module 110 via the voltage transmission line 20 before the light-emission phase.

[0088] Exemplarily, the display panel includes multiple cascaded emission control circuits 50. The first output terminal O1 of each emission control circuit 50 is connected to a corresponding row of pixel circuits 10 via a scan line 60, thereby outputting a first emission control signal EM to the switch module 120 and emission control module 160 in the corresponding row of pixel circuits 10 via the scan line 60. The first emission control signal EM controls the on and off of the switch module 120 and emission control module 160 in the row of pixel circuits 10. The second output terminal O2 of each emission control circuit 50 is connected to the first terminal of the storage module 110 in the corresponding row of pixel circuits 10 via a voltage transmission line 20, thereby controlling the voltage transmission line 20 to transmit a compensation voltage to the first terminal of the storage module 110 before the emission phase via the emission control circuit 50. The input end of the subsequent-stage light-emitting control circuit 50 is connected to the first output end O1 of the previous-stage light-emitting control circuit 50. The first light-emitting control signal EM output by the previous-stage light-emitting control circuit 50 can be used as the input signal of the subsequent-stage light-emitting control circuit 50, so that the subsequent-stage light-emitting control circuit 50 shifts the timing of the first light-emitting control signal EM output by the previous-stage light-emitting control circuit 50, thereby obtaining the first light-emitting control signal EM of the current-stage light-emitting control circuit 50, realizing row-by-row scanning of each row of pixel circuits 10, and compensating row-by-row for the influence of the voltage drop on the first power line 30 on the driving current generated by the driving module 130 in each row of pixel circuits 10.

[0089] Combine Figures 5 to 7Furthermore, the light-emission control circuit 50 includes a light-emission control signal generating circuit 510 and a compensation control module 520. The output terminal of the light-emission control signal generating circuit 510 is connected as a first output terminal O1 to the control terminal of the switch module 120 in the corresponding row of pixel circuits 10. The light-emission control signal generating circuit 510 is used to generate a first light-emission control signal EM. The compensation control module 520 is connected between the output terminal of the light-emission control signal generating circuit 510 and the compensation voltage line 70. The output terminal of the compensation control module 520 is connected as a second output terminal O2 to the voltage transmission line 20. The compensation control module 520 is used to transmit the compensation voltage on the compensation voltage line 70 to the voltage transmission line 20 before the light-emission phase based on the first light-emission control signal EM.

[0090] Specifically, the light-emission control signal generating circuit 510 may be a shift register. The output end of the light-emission control signal generating circuit 510 is connected to the control end of the switch module 120 and the control end of the light-emission control module 160 in the corresponding row of pixel circuits 10 via the scan line 60, thereby outputting the first light-emission control signal EM to the switch module 120 and the light-emission control module 160 in the corresponding row of pixel circuits 10 via the scan line 60. The light-emission control signal generating circuit 510 in the subsequent light-emission control circuit 50 is connected to the input end of the light-emission control signal generating circuit 510 in the previous light-emission control circuit 50. The first light-emission control signal EM output by the light-emission control signal generating circuit 510 in the previous light-emission control circuit 50 may serve as the input signal of the light-emission control signal generating circuit 510 in the subsequent light-emission control circuit 50, so that the light-emission control signal generating circuit 510 in the subsequent light-emission control circuit 50 shifts the timing of the first light-emission control signal EM output by the light-emission control signal generating circuit 510 in the previous light-emission control circuit 50, thereby obtaining the first light-emission control signal EM for the light-emission control signal generating circuit 510 in the current light-emission control circuit 50.

[0091] The compensation voltage line 70 is connected to the compensation voltage, for example, the compensation voltage is the first power supply voltage VDD. The compensation control module 520 can respond to the first light-emitting control signal EM to transmit the first power supply voltage VDD on the compensation voltage line 70 to the voltage transmission line 20 before the light-emitting stage, so as to transmit the first power supply voltage VDD to the first end of the storage module 110 in the corresponding row of pixel circuits 10 through the voltage transmission line 20 before the light-emitting stage. By connecting the compensation control module 520 to the output end of the light-emitting control signal generating circuit 510 in the non-display area 200, the compensation control module 520 is located in the non-display area 200, and each compensation control module 520 is set corresponding to a row of pixel circuits 10, so that the compensation control module 520 can respond to the first light-emitting control signal EM to provide a compensation voltage to the first end of the storage module 110 in the corresponding row of pixel circuits 10. In this way, there is no need to set the compensation control module 520 in the display area 100, and there is no need to set a compensation control module 520 for providing a compensation voltage to each pixel circuit 10 in the display area 100. This helps to reduce the area of ​​the display area 100 occupied by the pixel circuit 10 as a whole, thereby increasing the sub-pixel density (Pixels Per Inch, PPI) of the display panel, which is beneficial to improving the display effect.

[0092] Combine Figures 5 to 7 Furthermore, the compensation control module 520 includes an inverting unit 521 and a switch unit 522. The inverting unit 521 is connected between the output terminal of the light-emission control signal generating circuit 510 and the control terminal of the switch unit 522. The inverting unit 521 is configured to invert the phase of the first light-emission control signal EM and output the inverted phase to the control terminal of the switch unit 522. The switch unit 522 is connected between the compensation voltage line 70 and the voltage transmission line 20. The switch unit 522 is configured to turn on before the light-emission phase in response to a signal at its control terminal, thereby transmitting the voltage on the compensation voltage line 70 to the voltage transmission line 20.

[0093] Specifically, the inverting unit 521 can invert the phase of the first light-emitting control signal EM output by the light-emitting control signal generating circuit 510, that is, inverting the high-level signal in the first light-emitting control signal EM into a low-level signal, and inverting the low-level signal in the first light-emitting control signal EM into a high-level signal, thereby generating the second light-emitting control signal EMB. The switching unit 522 is turned on or off in response to the second light-emitting control signal EMB, and is turned on before the light-emitting phase to transmit the voltage on the compensation voltage line 70 to the voltage transmission line 20. By setting the switch unit 522 in the non-display area 200, and each switch unit 522 is set corresponding to a row of pixel circuits 10, the switch unit 522 can respond to the second light-emitting control signal EMB to transmit the voltage on the compensation voltage line 70 to the voltage transmission line 20, so as to provide a compensation voltage to the first end of the storage module 110 in the corresponding row of pixel circuits 10. In this way, there is no need to set the switch unit 522 in the display area 100, and there is no need to set a switch unit 522 for each pixel circuit 10 in the display area 100, which helps to reduce the area of ​​the display area 100 occupied by the pixel circuit 10 as a whole, thereby increasing the sub-pixel density PPI of the display panel, which is beneficial to improving the display effect.

[0094] Furthermore, the inverting unit 521 includes a third transistor T3 and a fourth transistor T4, and the switching unit 522 includes a fifth transistor T5. The gate of the third transistor T3 is connected to the output terminal of the light-emitting control signal generating circuit 510, the first electrode of the third transistor T3 is connected to the first level signal VGH, and the second electrode of the third transistor T3 is connected to the gate of the fifth transistor T5. The gate of the fourth transistor T4 is connected to the first electrode of the fourth transistor T4, the first electrode of the fourth transistor T4 is connected to the second level signal VGL, and the second electrode of the fourth transistor T4 is connected to the gate of the fifth transistor T5. Among them, one of the first level signal VGH and the second level signal VGL is a high level signal, and the other is a low level signal. The second level signal VGL is a signal that controls the conduction of the fourth transistor T4. The first electrode of the fifth transistor T5 is connected to the compensation voltage line 70, and the second electrode of the fifth transistor T5 is connected to the voltage transmission line 20.

[0095] Specifically, the third transistor T3 and the fourth transistor T4 are of the same type. For example, when the conduction level signal in the first light-emitting control signal EM (i.e., the signal that controls the switch module 120 and the light-emitting control module 160 to be turned on) is a low-level signal, the third transistor T3 and the fourth transistor T4 can be set to be P-type transistors, the first level signal VGH is a high-level signal, and the second level signal VGL is a low-level signal.

[0096] The specific structure of the light emitting control signal generating circuit 510 can be various, and one of the circuit structures is used as an example below. Figure 7Optionally, the light emitting control signal generating circuit 510 includes an eleventh transistor T11, a twelfth transistor T12, a thirteenth transistor T13, a fourteenth transistor T14, a fifteenth transistor T15, a sixteenth transistor T16, a seventeenth transistor T17, an eighteenth transistor T18, a nineteenth transistor T19, a twentieth transistor T20, a first capacitor C1, a second capacitor C2 and a third capacitor C3. The first electrode of the eleventh transistor T11 serves as an input terminal of the light-emission control signal generating circuit 510 and is connected to the input signal EIN. The gates of the eleventh transistor T11, the gates of the thirteenth transistor T13, and the first electrode of the twelfth transistor T12 are connected to the first clock signal ECK1. The gates of the fifteenth transistor T15, the gates of the seventeenth transistor T17, the first electrode of the eighteenth transistor T18, and the first electrode of the third capacitor C3 are connected to the second clock signal ECK2. The first electrodes of the fourteenth transistor T14, the sixteenth transistor T16, and the nineteenth transistor T19 are connected to the first level signal VGH. The first electrode of the thirteenth transistor T13 and the first electrode of the twentieth transistor T20 are connected to the second level signal VGL. The second electrode of the nineteenth transistor T19 and the second electrode of the twentieth transistor T20 serve as output terminals of the light-emission control signal generating circuit 510 and output the first light-emission control signal EM. The light-emission control signal generating circuit 510 can shift the timing of the input signal EIN to generate the first light-emission control signal EM. Each transistor in the light emission control signal generating circuit 510 can be either a P-type transistor or an N-type transistor. One of the first level signal VGH and the second level signal VGL is a high level signal, and the other is a low level signal.

[0097] Figure 8 This is a driving timing diagram provided by an embodiment of the present invention, which can be applied to driving Figure 4 、 Figure 5 The pixel circuit and Figure 7 The following describes the working principle of the pixel circuit and the light-emitting control circuit, taking as an example the compensation voltage connected to the compensation voltage line 70 being the first power supply voltage VDD, the transistors in the pixel circuit and the light-emitting control circuit being all P-type transistors, the first level signal VGH being a high-level signal, and the second level signal VGL being a low-level signal.

[0098] Combine Figures 5 to 8 , exemplarily, the working phases of the pixel circuit include an initialization phase t1, a data writing phase t2 and a light emitting phase t3.

[0099] In the initialization phase t1, the first scanning signal S1 and the third scanning signal S3 are low-level signals, and the second scanning signal S2 is a high-level signal. The first light-emitting control signal EM transmitted by the light-emitting control circuit 50 to the corresponding row of pixel circuits 10 is a high-level signal. The third transistor T3 in the light-emitting control circuit 50 is turned off, the fourth transistor T4 is turned on, the second light-emitting control signal EMB is a low-level signal, and the fifth transistor T5 is turned on, transmitting the first power supply voltage VDD on the compensation voltage line 70 to the voltage transmission line 20, so as to transmit the first power supply voltage VDD to the first electrode of the storage capacitor Cst in the corresponding row of pixel circuits 10 through the voltage transmission line 20. Since the voltage transmission line 20 and the compensation voltage line 70 are both signal transmission lines for transmitting voltage, the current on the voltage transmission line 20 and the compensation voltage line 70 is small, so the voltage drop on the voltage transmission line 20 and the compensation voltage line 70 is small, or even negligible, so the voltage of the N node can be expressed as: V N =VDD. The ninth transistor T9 and the tenth transistor T10 in the pixel circuit 10 are turned on. The initialization voltage Vref is written into the gate of the driving transistor DT via the ninth transistor T9, initializing the gate voltage of the driving transistor DT and controlling the driving transistor DT to turn on. The reset voltage V0 is written into the first electrode of the light-emitting device D1 via the tenth transistor T10, initializing the voltage of the first electrode of the light-emitting device D1.

[0100] In the data writing phase t2, the first scanning signal S1 and the third scanning signal S3 are high-level signals, and the second scanning signal S2 is a low-level signal. The light-emitting control circuit 50 continues to transmit the high-level first light-emitting control signal EM to the corresponding row of pixel circuits 10, and the second light-emitting control signal EMB remains a low-level signal. The fifth transistor T5 continues to transmit the first power supply voltage VDD on the compensation voltage line 70 to the voltage transmission line 20, so as to transmit the first power supply voltage VDD to the first electrode of the storage capacitor Cst in the corresponding row of pixel circuits 10 through the voltage transmission line 20, so that the voltage of the N node V N =VDD. The sixth transistor T6 and the eighth transistor T8 in the pixel circuit 10 are turned on, and the data voltage Vdata is sequentially written into the gate of the driving transistor DT through the sixth transistor T6, the driving transistor DT, and the eighth transistor T8, so that the gate of the driving transistor DT is charged by the data voltage Vdata. When the voltage difference between the gate of the driving transistor DT and the first electrode reaches the threshold voltage Vth of the driving transistor DT, the driving transistor DT is turned off, so that the voltage V G =Vdata+Vth, wherein the threshold voltage Vth of the driving transistor DT is a negative value.

[0101] In the light-emitting stage t3, the first scanning signal S1, the second scanning signal S2 and the third scanning signal S3 are high-level signals. The light-emitting control circuit 50 transmits a low-level first light-emitting control signal EM to the corresponding row of pixel circuits 10, the third transistor T3 and the fourth transistor T4 are turned on, the second light-emitting control signal EMB is a high-level signal, and the fifth transistor T5 is turned off. The first transistor T1, the second transistor T2, the seventh transistor T7 and the driving transistor DT in the pixel circuit 10 are turned on, and the remaining transistors are turned off. The discharge path between the first power line 30 and the second power line 40 is turned on, and the driving transistor DT generates a driving current based on the voltage difference between its own gate and the first electrode to drive the light-emitting device D1 to emit light. A driving current flows through the first power line 30, causing a voltage drop in the first power supply voltage VDD on the first power line 30, and the voltage V S =VDD+Vdrop, the voltage of the N node V N =V S =VDD+Vdrop. Voltage change of N node △V N =VDD+Vdrop-VDD=Vdrop. The storage capacitor Cst has a coupling effect, which can couple the voltage of the G node according to the voltage change of the N node, so that the voltage of the G node V G =Vdata+Vth+ΔV N =Vdata+Vth+Vdrop. The driving current I generated by the driving transistor DT can be expressed as:

[0102] I=k(V GS -Vth) 2 =k(V G -V S -Vth) 2 =k(Vdata+Vth+Vdrop-VDD-Vdrop-Vth) 2 ;

[0103] Therefore, the driving current I generated by the driving transistor DT is I=k(Vdata-VDD) 2 , where k=(W / 2L)μCox, W is the channel width of the driving transistor DT, L is the channel length of the driving transistor DT, μ is the mobility of the driving transistor DT, and Cox is the channel capacitance per unit area of ​​the driving transistor DT.

[0104] It can be seen that the driving current I is only related to the magnitude of the data voltage Vdata and the first power supply voltage VDD (that is, the first power supply voltage excluding the voltage drop), and is not related to the threshold voltage Vth of the driving transistor DT and the voltage drop Vdrop generated on the first power supply line 30. This embodiment not only realizes the threshold voltage compensation of the driving transistor DT, but also realizes the compensation of the influence of the voltage drop Vdrop on the first power supply line 30 on the driving current I.

[0105] When the display panel includes n rows of pixel circuits 10, the pixel circuits 10 in rows 1 to n can be scanned row by row. During the initialization phase t1 and the data writing phase t2 of the pixel circuits 10 in the first row, the first power supply voltage VDD on the compensation voltage line 70 is transmitted to the voltage transmission line 20 via the fifth transistor T5 in the first-stage light-emitting control circuit 50, so that the compensation voltage is transmitted to the first electrode of the storage capacitor Cst in the pixel circuits 10 in the first row via the voltage transmission line 20. During the light-emitting phase t3 of the pixel circuits 10 in the first row, the voltage on the first power line 30 is transmitted to the first electrode of the storage capacitor Cst via the first transistor T1, and the gate voltage of the driving transistor DT is compensated by the first electrode of the storage capacitor Cst based on the voltage change of the first electrode thereof, thereby compensating for the effect of the voltage drop on the first power line 30 on the driving current generated by the driving transistor DT in the pixel circuits 10 in the first row. During the initialization phase t1 and data writing phase t2 of the second row of pixel circuits 10, the first power supply voltage VDD on the compensation voltage line 70 is transmitted to the voltage transmission line 20 via the fifth transistor T5 in the second-stage light-emitting control circuit 50, thereby transmitting the compensation voltage to the first electrode of the storage capacitor Cst in the second row of pixel circuits 10 via the voltage transmission line 20. During the light-emitting phase t3 of the second row of pixel circuits 10, the voltage on the first power line 30 is transmitted to the first electrode of the storage capacitor Cst via the first transistor T1. The first electrode of the storage capacitor Cst compensates the gate voltage of the driving transistor DT based on the voltage change of the first electrode of the storage capacitor Cst, thereby compensating for the effect of the voltage drop on the first power line 30 on the driving current generated by the driving transistor DT in the second row of pixel circuits 10. Similarly, the pixel circuits 10 in rows 3 to n are scanned row by row, thereby compensating for the effect of the voltage drop on the first power line 30 on the driving current generated by the driving transistor DT in each row of pixel circuits 10.

[0106] The specific structure of the compensation control module 520 in the light emitting control circuit 50 can be various. Figure 7 Only one of these is shown. Figure 9 FIG is a structural diagram of another light emitting control circuit provided by an embodiment of the present invention. Figure 9In another embodiment, the compensation control module 520 may further include a twenty-first transistor T21. The gate of the twenty-first transistor T21 is connected to the output terminal (i.e., the first output terminal O1) of the light-emitting control signal generating circuit 510. The first electrode of the twenty-first transistor T21 is connected to the compensation voltage line 70. The second electrode of the twenty-first transistor T21, as the output terminal (i.e., the second output terminal O2) of the compensation control module 520, is connected to the voltage transmission line 20. The type of the twenty-first transistor T21 is different from that of the first transistor T1 in the switch module 120. The twenty-first transistor T21 may be a P-type transistor or an N-type transistor. One of the first transistor T1 and the twenty-first transistor T21 is a P-type transistor, and the other is an N-type transistor. Figures 3 to 5 The first transistor T1 is a P-type transistor. Accordingly, the twenty-first transistor T21 may be an N-type transistor. In other embodiments, if the first transistor T1 is an N-type transistor, the twenty-first transistor T21 may be a P-type transistor.

[0107] The following description will be made by taking the example of the twenty-first transistor T21 being an N-type transistor. Figure 8 and Figure 9 During the initialization phase t1 and the data writing phase t2, the first emission control signal EM is a high-level signal, the twenty-first transistor T21 is turned on in response to the first emission control signal EM, and the compensation voltage on the compensation voltage line 70 is transmitted to the voltage transmission line 20 via the twenty-first transistor T21. During the emission phase t3, the first emission control signal EM is a low-level signal, the twenty-first transistor T21 is turned off in response to the first emission control signal EM, and the compensation voltage on the compensation voltage line 70 cannot be transmitted to the voltage transmission line 20 via the twenty-first transistor T21. Providing the compensation control module 520 with the twenty-first transistor T21 helps simplify the overall structure of the compensation control module 520, thereby saving space occupied by the compensation control module 520 in the display panel.

[0108] Figure 10 FIG is a structural diagram of another light emitting control circuit provided by an embodiment of the present invention. Figure 10In another embodiment, the inverting unit 521 in the compensation control module 520 may be configured as a CMOS inverter to invert the phase of the first emission control signal EM, i.e., invert a high-level signal in the first emission control signal EM into a low-level signal, and invert a low-level signal in the first emission control signal EM into a high-level signal, thereby generating the second emission control signal EMB. Optionally, the inverting unit 521 includes a third transistor T3 and a fourth transistor T4, wherein the gates of the third and fourth transistors T3 and T4 are connected to the output terminal (i.e., the first output terminal O1) of the emission control signal generating circuit 510, a first electrode of the fourth transistor T4 is connected to the first voltage V1, a first electrode of the third transistor T3 is connected to the second voltage V2, and a second electrode of the fourth transistor T4 is connected to the second electrode of the third transistor T3. One of the third and fourth transistors T3 and T4 is a P-type transistor, and the other is an N-type transistor. One of the first and second voltages V1 and V2 is a positive voltage, and the other is a negative voltage or zero.

[0109] Exemplarily, the third transistor T3 is an N-type transistor, the fourth transistor T4 is a P-type transistor, the first voltage V1 is greater than the second voltage V2, and the first voltage V1 is a positive voltage, the second voltage V2 is a negative voltage or zero, for example, the signal corresponding to the first voltage V1 is a high-level signal, and the signal corresponding to the second voltage V2 is a low-level signal. Figure 8 and Figure 10 During the initialization phase t1 and the data writing phase t2, the first emission control signal EM is a high-level signal, the third transistor T3 is turned on, and the fourth transistor T4 is turned off. The third transistor T3 outputs the second voltage V2, resulting in a low-level second emission control signal EMB. During the emission phase t3, the first emission control signal EM is a low-level signal, the third transistor T3 is turned off, and the fourth transistor T4 is turned on. The fourth transistor T4 outputs the first voltage V1, resulting in a high-level second emission control signal EMB, thus achieving phase inversion processing of the first emission control signal EM.

[0110] Combine Figure 6 、 Figure 7 、 Figure 9 and Figure 10 Based on the above embodiments, optionally, the compensation voltage line 70 extends in the non-display area 200 along the direction of the edge of the display area 100. For example, the compensation voltage line 70 is located on one side of the display area 100 and extends along the arrangement direction of the light emitting control circuits 50 of each stage or the column direction of the pixel circuits 10, so as to provide a compensation voltage to the switch units 522 in the light emitting control circuits 50 of each stage through the compensation voltage line 70.

[0111] Furthermore, a bonding connection (not shown) can be provided in the non-display area 200. The bonding connection is connected to the first power supply voltage VDD and is respectively connected to the first power line 30 and the compensation voltage line 70. The bonding connection is used to connect to a driver chip, so that the driver chip provides the first power supply voltage VDD to the bonding connection, so that both the first power line 30 and the compensation voltage line 70 are connected to the first power supply voltage VDD. Alternatively, a first bonding connection and a second bonding connection (not shown) can be provided in the non-display area 200, with the first bonding connection connected to the first power line 30 and the second bonding connection connected to the compensation voltage line 70, and the first and second bonding connections are respectively connected to the first power supply voltage VDD. The first and second bonding connections are both used to connect to the driver chip, so that the driver chip provides the first power supply voltage VDD to the first and second bonding connections, respectively, so that both the first power line 30 and the compensation voltage line 70 are connected to the first power supply voltage VDD.

[0112] Combine Figure 6 、 Figure 7 、 Figure 9 and Figure 10 Optionally, each level of the light-emitting control circuit 50 is located on at least one side of the display area 100, and each level of the light-emitting control circuit 50 on each side is provided with a corresponding compensation voltage line 70. For example, a compensation voltage line 70 and multiple cascaded light-emitting control circuits 50 can be provided on the left side of the display area 100, and the switch unit 522 in each level of the light-emitting control circuit 50 is connected to the compensation voltage line 70. A compensation voltage line 70 and multiple cascaded light-emitting control circuits 50 can be provided on the right side of the display area 100, and the switch unit 522 in each level of the light-emitting control circuit 50 is connected to the compensation voltage line 70. Compensation voltage lines 70 and multiple cascaded light-emitting control circuits 50 can also be provided on both sides of the display area 100.

[0113] An embodiment of the present invention further provides a display device, which may be a mobile phone, a computer, or a tablet computer, etc. The display device includes the display panel in any of the above embodiments, and thus has the corresponding structure and beneficial effects of the display panel, which will not be described in detail here.

[0114] An embodiment of the present invention further provides a method for driving a display panel, which is used to drive the display panel in any of the above embodiments. Figure 11 FIG is a flow chart of a method for driving a display panel provided by an embodiment of the present invention. Figure 11 , the method specifically comprises the following steps:

[0115] S110 , transmitting a compensation voltage to a first terminal of the storage module through a voltage transmission line before a light-emitting phase.

[0116] S120 , transmitting the voltage on the first power line to the first end of the storage module through the switch module during the light-emitting phase.

[0117] S130 , compensating the voltage of the control terminal of the driving module according to the voltage change of the first terminal of the storage module during the light-emitting phase, so as to compensate for the voltage drop on the first power line.

[0118] S140 , driving the light-emitting module to emit light according to the voltage of its control terminal during the light-emitting phase through the driving module.

[0119] The compensation voltage transmitted to the first end of the storage module through the voltage transmission line is different from the voltage transmitted to the first end of the storage module through the first power line, so that the voltage of the first end of the storage module changes during the light-emitting stage.

[0120] The technical solution of an embodiment of the present invention transmits a compensation voltage to the first terminal of a storage module in a corresponding row of pixel circuits via a voltage transmission line before a light-emitting phase, and transmits the voltage on the first power line to the first terminal of the storage module via a switch module during the light-emitting phase, so that the voltage change at the first terminal of the storage module is the difference between the voltage on the first power line and the compensation voltage. Since there is a voltage drop on the first power line, the voltage change at the first terminal of the storage module includes the voltage drop on the first power line. During the light-emitting phase, the storage module compensates for the voltage at the control terminal of the driver module based on the voltage change at its first terminal, so that the voltage at the control terminal of the driver module includes the voltage drop on the first power line, and the voltage at the first terminal of the driver module also includes the voltage drop on the first power line. This helps compensate for the effect of the voltage drop on the first power line on the voltage difference between the control terminal and the first terminal of the driver module, thereby compensating for the effect of the voltage drop on the first power line on the drive current generated by the driver module. Since the voltage transmission lines are arranged in a one-to-one correspondence with each row of pixel circuits, this solution can compensate row by row for the impact of the voltage drop on the first power line on the driving current generated by the driving module in each row of pixel circuits, thereby improving the display brightness uniformity of the display panel and thereby improving the overall display effect.

[0121] 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 display panel, characterized in that: It includes a pixel circuit and a voltage transmission line corresponding to the pixel circuit; The pixel circuit includes a storage module, a switch module, a driving module and a light-emitting module, the voltage transmission line is connected to the first end of the storage module in the pixel circuit, and the voltage transmission line is used to transmit a compensation voltage to the first end of the storage module before the light-emitting stage; The switch module is connected between the first end of the storage module and the first power line, and is used to transmit the voltage on the first power line to the first end of the storage module during the light-emitting phase; The second end of 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 and compensate the voltage of the control end of the driving module according to the voltage change of the first end thereof during the light-emitting stage, so as to compensate for the voltage drop on the first power line; The driving module is connected between the first power line and the light-emitting module, and is used to drive the light-emitting module to emit light according to the voltage of its control terminal during the light-emitting stage; The compensation voltage transmitted to the first end of the storage module through the voltage transmission line is different from the voltage transmitted to the first end of the storage module through the first power line during the light-emitting stage, so that the voltage of the first end of the storage module changes during the light-emitting stage.

2. The display panel according to claim 1, wherein: The voltages connected to the first power line and the voltage transmission line are both a first power voltage, and the first power voltage is a high-level signal.

3. The display panel according to claim 2, wherein: The display panel includes multiple rows of pixel circuits and multiple voltage transmission lines. The multiple rows of pixel circuits are arranged in a one-to-one correspondence with the multiple voltage transmission lines. Each voltage transmission line is connected to the first end of the storage module in a corresponding row of pixel circuits.

4. The display panel according to claim 1, wherein: The pixel circuit further includes a light emitting control module and a second power line, wherein the light emitting control module, the driving module, and the light emitting module are connected in series between the first power line and the second power line, and a control terminal of the light emitting control module receives a first light emitting control signal, and the light emitting control module is configured to be turned on or off in response to the first light emitting control signal; The control end of the switch module receives the first light-emitting control signal, and the switch module is turned on in the light-emitting phase in response to the first light-emitting control signal to transmit the voltage on the first power line to the first end of the storage module.

5. The display panel according to claim 4, wherein: The switch module includes a first transistor, a gate of the first transistor is connected to the first light-emitting control signal, a first electrode of the first transistor is connected to the first power line, and a second electrode of the first transistor is connected to the first end of the storage module.

6. The display panel according to claim 4, wherein: The light emitting control module includes a second transistor, a gate of the second transistor is connected to the first light emitting control signal, and the second transistor is connected between the first power line and the second power line.

7. The display panel according to claim 1, wherein: The display panel has a display area and a non-display area, the display area includes a plurality of rows of the pixel circuits, and the display panel further includes a plurality of rows of light emitting control circuits located in the non-display area, each row of the pixel circuits being correspondingly provided with a light emitting control circuit and a voltage transmission line; The light-emitting control circuit includes a first output terminal and a second output terminal, the first output terminal of the light-emitting control circuit being connected to the control terminal of the switch module in the corresponding row of pixel circuits, and the light-emitting control circuit being configured to output a first light-emitting control signal to the control terminal of the switch module in the corresponding row of pixel circuits, so that the switch module is turned on in a light-emitting phase in response to the first light-emitting control signal, and transmits the voltage on the first power line to the first terminal of the storage module; The second output end of the light-emitting control circuit is connected to the first end of the storage module in the corresponding row of pixel circuits through the voltage transmission line, and the light-emitting control circuit is also used to transmit the compensation voltage to the first end of the storage module through the voltage transmission line before the light-emitting stage.

8. The display panel according to claim 7, wherein: The light emitting control circuit includes a light emitting control signal generating circuit and a compensation control module; The output end of the light emitting control signal generating circuit is connected to the control end of the switch module in the corresponding row of pixel circuits as the first output end, and the light emitting control signal generating circuit is used to generate the first light emitting control signal; The compensation control module is connected to the output end of the light-emitting control signal generating circuit and the compensation voltage line, and the output end of the compensation control module is connected to the voltage transmission line as the second output end. The compensation control module is used to transmit the voltage on the compensation voltage line to the voltage transmission line before the light-emitting stage according to the first light-emitting control signal.

9. The display panel according to claim 8, wherein: The compensation control module includes an inverting unit and a switch unit; The inverting unit is connected between the output terminal of the light emitting control signal generating circuit and the control terminal of the switch unit, and is used to invert the phase of the first light emitting control signal and output it to the control terminal of the switch unit; The switch unit is connected between the compensation voltage line and the voltage transmission line. The switch unit is configured to respond to a signal from its control terminal and be turned on before the light-emitting phase to transmit the voltage on the compensation voltage line to the voltage transmission line.

10. The display panel according to claim 9, wherein: The inverting unit includes a third transistor and a fourth transistor, and the switching unit includes a fifth transistor; The gate of the third transistor is connected to the output end of the light emitting control signal generating circuit, the first electrode of the third transistor is connected to the first level signal, and the second electrode of the third transistor is connected to the gate of the fifth transistor; The gate of the fourth transistor is connected to the first electrode of the fourth transistor, the first electrode of the fourth transistor is connected to the second level signal, and the second electrode of the fourth transistor is connected to the gate of the fifth transistor; wherein one of the first level signal and the second level signal is a high level signal and the other is a low level signal, and the second level signal is a signal for controlling the conduction of the fourth transistor; A first electrode of the fifth transistor is connected to the compensation voltage line, and a second electrode of the fifth transistor is connected to the voltage transmission line.

11. The display panel according to any one of claims 8 or 9, characterized in that: The compensation voltage line extends in the non-display area along a direction where an edge of the display area is located; The display panel further includes a first bonding connection portion and a second bonding connection portion located in the non-display area, the first bonding connection portion being connected to the first power line, the second bonding connection portion being connected to the compensation voltage line, and the first bonding connection portion and the second bonding connection portion being respectively connected to the first power supply voltage; or The display panel further includes a bonding connection portion located in the non-display area, wherein the bonding connection portion is connected to a first power supply voltage and is respectively connected to the first power supply line and the compensation voltage line.

12. The display panel according to claim 1, wherein The pixel circuit also includes a second power line, the driving module includes a driving transistor, the storage module includes a storage capacitor, and the light-emitting module includes a light-emitting device; the driving transistor and the light-emitting device are connected in series between the first power line and the second power line, the first electrode of the storage capacitor is connected to the voltage transmission line, and the second electrode of the storage capacitor is connected to the gate of the driving transistor.

13. The display panel according to claim 12, wherein: The pixel circuit further includes a data writing module, a first end of the data writing module is connected to a data voltage, a second end of the data writing module is connected to the driving module, and the data writing module is used to write the data voltage to the driving module.

14. The display panel according to claim 13, wherein: The pixel circuit also includes a threshold compensation module, the second end of the data writing module is connected to the first end of the driving module, the threshold compensation module is connected between the second end of the driving module and the control end, and the threshold compensation module is used to compensate for the threshold voltage of the driving module.

15. The display panel according to claim 12, wherein: The pixel circuit further includes an initialization module, a first end of the initialization module is connected to an initialization voltage, a second end of the initialization module is connected to a control end of the driving module, and the initialization module is used to write the initialization voltage to the control end of the driving module.

16. The display panel according to claim 15, wherein: The pixel circuit further includes a reset module, a first end of the reset module is connected to a reset voltage, a second end of the reset module is connected to the first end of the light emitting module, and the reset module is used to write the reset voltage to the first end of the light emitting module.

17. The display panel according to claim 16, wherein: The initialization voltage and the reset voltage are the same voltage.

18. A method for driving a display panel, characterized in that: The display panel includes a pixel circuit and a voltage transmission line corresponding to the pixel circuit; the pixel circuit includes a storage module, a switch module, a driving module and a light-emitting module, the voltage transmission line is connected to a first end of the storage module in the pixel circuit; the switch module is connected between the first end of the storage module and a first power line; the second end of the storage module is connected to a control end of the driving module, and the storage module is used to store a voltage at the control end of the driving module; The driving module is connected between the first power line and the light emitting module; The display panel driving method includes: transmitting a compensation voltage to the first end of the storage module through the voltage transmission line before the light emitting stage; transmitting the voltage on the first power line to the first end of the storage module through the switch module during the light-emitting phase; The storage module compensates the voltage of the control terminal of the driving module according to the voltage change of the first terminal thereof during the light-emitting phase, so as to compensate for the voltage drop on the first power line; The driving module drives the light emitting module to emit light according to the voltage of its control terminal during the light emitting stage; The compensation voltage transmitted to the first end of the storage module through the voltage transmission line is different from the voltage transmitted to the first end of the storage module through the first power line during the light-emitting stage, so that the voltage of the first end of the storage module changes during the light-emitting stage.

19. A display device, characterized in that: The display panel comprises any one of claims 1-17.

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