Pixel circuit, driving method, display panel and display device

Abstract

The invention provides a pixel circuit, a driving method, a display panel and a display device. The pixel circuit comprises a driving module, a light emitting module and a dark spot eliminating module. The first end of the driving module is connected with the first power line, the cathode of the light-emitting module is connected with the second power line, and the driving module is used for controlling the light-emitting module to emit light in the light-emitting stage according to control signals of the control end. And the dark spot elimination module is connected with the first pole of the light emitting module and is used for writing dark spot elimination voltage into the first pole of the light emitting module in a dark spot elimination stage. According to the pixel circuit provided by the invention, the transmission path of the dark spot elimination voltage is shortened, and the dark spot elimination voltage is prevented from passing through the transistor and the multiple sections of wires, so that the problem of circuit burn caused by over-high heat generated by over-high resistance of the transistor and the multiple sections of wires is avoided. And meanwhile, limitation of the conduction voltage of the transistor is avoided, and higher dark spot elimination voltage can be applied, so that the dark spot elimination effect is improved.

Description

Technical Field

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

[0002] With the development of display technology, the application of display panels is becoming more and more extensive, and the requirements for display panels are becoming higher and higher accordingly. When manufacturing display panels, dark spots need to be eliminated.

[0003] However, existing display panels have a problem of poor dark spot elimination effect. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a pixel circuit that can improve the dark spot elimination effect.

[0005] Based on the above purpose, the present application provides a pixel circuit, which includes:

[0006] Driving module, lighting module and dark spot elimination module;

[0007] The first end of the driving module is connected to the first power line, the second end of the light emitting module is connected to the second power line, and the driving module is used to control the light emitting module to emit light according to the control signal of its control end in the light emitting stage;

[0008] The dark spot elimination module is connected to the first electrode of the light emitting module, and is used to write a dark spot elimination voltage into the anode of the light emitting module during the dark spot elimination stage.

[0009] In one embodiment, the dark spot elimination module includes:

[0010] A connecting line, wherein the connecting line connects the first electrode of the light-emitting module in each pixel circuit to a third power line, and the third power line is used to transmit a dark spot elimination voltage;

[0011] In the dark spot elimination stage, the dark spot elimination voltage is written into the first electrode of the light emitting module in each of the pixel circuits through the connecting line;

[0012] Preferably, the dark spot elimination voltage is greater than a first voltage transmitted by the first power line.

[0013] In one embodiment, the dark spot elimination module further includes:

[0014] a first switch unit, wherein a control end of the first switch unit is connected to a first switch control signal line, one end of the first switch unit is connected to a third power line, and the other end of the first switch unit is connected to a first pole of the light-emitting module, and the third power line is used to transmit a dark spot elimination voltage;

[0015] The first switch unit is used to respond to the signal on the first switch control signal line to be turned on during the dark spot elimination phase;

[0016] Preferably, the dark spot elimination module further comprises a series unit, a first end of which is connected to the third power line, and a second end of which is connected to the first electrodes of the light-emitting modules in at least two different pixel circuits;

[0017] Preferably, the dark spot elimination module further includes:

[0018] A second switch unit, wherein a control end of the second switch unit is connected to a second switch control signal line, and two ends of the second switch unit are connected to first electrodes of the light-emitting modules in at least two different pixel circuits;

[0019] The second switch unit is used to respond to the signal on the second switch control signal line and be turned on during the dark spot elimination phase.

[0020] In one implementation manner, the pixel circuit further includes:

[0021] A first reset module, wherein the control end of the first reset module is connected to the first scanning signal line, the first end of the first reset module is connected to the control end of the driving module, the second end of the first reset module is connected to the first reference signal line, and the first reset module is used to reset the control end of the driving module.

[0022] and / or,

[0023] A second reset module, wherein the control end of the second reset module is connected to the third scanning signal line, the first end of the second reset module is connected to the anode of the light-emitting module, the second end of the second reset module is connected to the second reference signal line, and the second reset module is used to reset the anode of the light-emitting module.

[0024] In one implementation manner, the pixel circuit further includes:

[0025] a data writing module, wherein a control end of the data writing module is connected to the second scanning signal line, a first end of the data writing module is connected to the data line, and a second end of the data writing module is connected to the first end of the driving module, and the data writing module is used to respond to a signal on the second scanning signal line and write a voltage related to the data voltage on the data line to the control end of the driving module during a data writing phase;

[0026] Preferably, the pixel circuit further includes:

[0027] a storage module, the storage module being connected to the control end of the driving module and being used to store the voltage of the control end of the driving module;

[0028] Preferably, the storage module comprises a storage capacitor, a first end of the storage capacitor is connected to the control end of the driving module, and a second end of the storage capacitor is connected to the first end of the driving module.

[0029] In one implementation manner, the pixel circuit further includes:

[0030] a first light-emitting control module, wherein a control end of the first light-emitting control module is connected to a light-emitting control signal line, a first end of the first light-emitting control module is connected to a second end of the driving module, a second end of the first light-emitting control module is connected to an anode of the light-emitting module, and the first light-emitting control module is used to respond to a signal on the light-emitting control signal line to turn on in the light-emitting stage and turn off in the aging stage;

[0031] A second light-emitting control module, wherein the first end of the second light-emitting control module is connected to the first end of the driving module, the control end of the second light-emitting control module is connected to a light-emitting control signal line, the second end of the second light-emitting control module is connected to the first power line, and the second light-emitting control module is used to respond to a signal on the light-emitting control signal line to turn on during the light-emitting stage.

[0032] In one implementation manner, the pixel circuit further includes:

[0033] A compensation module, wherein the control end of the compensation module is connected to the second scanning signal line, the first end of the compensation module is connected to the control end of the driving module, the second end of the compensation module is connected to the second end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module.

[0034] Based on the same inventive concept, the present application also discloses a display panel, the display panel includes the above-mentioned pixel circuit, and the display panel also includes:

[0035] substrate;

[0036] A first conductor layer is disposed on one side of the substrate, and a second reference signal line is located in the first conductor layer;

[0037] a second conductor layer, located on a side of the first conductor layer away from the substrate, the first power line and the third power line are located on the second conductor layer, the light-emitting module is located on a side of the second conductor layer away from the first conductor layer, and the first electrode of the light-emitting module is electrically connected to the first power line and the third power line;

[0038] The dark spot elimination voltage transmitted by the third power line is greater than the first voltage transmitted by the first power line.

[0039] In one embodiment, the display panel further includes:

[0040] a fourth conductor layer, located on a side of the second conductor layer away from the substrate, the fourth conductor layer comprising a connecting wire, the connecting wire being connected to the first power line and the third power line via holes, and the connecting wire being connected to the first pole via hole of the light-emitting module on a side away from the second conductor layer;

[0041] Preferably, the display panel further includes:

[0042] A third conductor layer, located on a side of the first conductor layer facing the substrate, a portion of the third conductor layer serving as a control terminal of the driving module;

[0043] The active layer is located on a side of the third conductor layer facing the substrate.

[0044] Based on the same inventive concept, the present application also discloses a pixel circuit driving method, which is applied to the pixel circuit shown, and the method includes:

[0045] In the dark spot elimination stage, a dark spot elimination voltage is written to the first pole of the light emitting module, and a second voltage is written to the second pole of the light emitting module, and dark spot impurities are eliminated by the voltage difference between the dark spot elimination voltage and the second voltage.

[0046] Based on the same inventive concept, the present application also discloses a display device, which includes the pixel circuit as described above; or, the display panel as described above.

[0047] Compared with the prior art, the pixel circuit provided by the present application connects the dark spot elimination module to the anode of the light-emitting module. In the dark spot elimination stage, the dark spot elimination module is used to write the dark spot elimination voltage into the first electrode of the light-emitting module, thereby shortening the transmission path of the dark spot elimination voltage and preventing the dark spot elimination voltage from passing through transistors and multiple wiring segments. Therefore, the problem of circuit burns caused by excessive heat generated due to excessive resistance of transistors and multiple wiring segments is avoided. At the same time, it is no longer limited by the on-voltage of the transistor, and a higher dark spot elimination voltage can be applied to improve the dark spot elimination effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A schematic diagram of a pixel circuit provided in an embodiment of the present application;

[0050] Figure 2 A schematic diagram of a pixel circuit provided in an embodiment of the present application;

[0051] Figure 3 A schematic diagram of a pixel circuit provided by another embodiment of the present application;

[0052] Figure 4 A schematic diagram of a pixel circuit provided by another embodiment of the present application;

[0053] Figure 5 A schematic diagram of a pixel circuit provided by another embodiment of the present application;

[0054] Figure 6 A schematic diagram of a pixel circuit provided by another embodiment of the present application;

[0055] Figure 7 A schematic diagram of a pixel circuit provided by another embodiment of the present application;

[0056] Figure 8 A circuit diagram of a pixel circuit provided in another embodiment of the present application;

[0057] Fig. 9 A schematic diagram of a pixel circuit provided by another embodiment of the present application;

[0058] Fig.10 A schematic diagram of a pixel circuit provided by another embodiment of the present application;

[0059] Fig.11 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application.

[0060] Marking Description:

[0061] 100, pixel circuit; 200, display panel; 1, connection line; 2, first electrode; 3, series connection unit; 4, substrate; 10, active layer; 21, first planarization layer; 22, second planarization layer;

[0062] Vhigh, the third power line; V1, the first switch control signal line; V2, the second switch control signal line. DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0064] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] Currently, when the pixel circuit is manufactured during the anode process, tiny conductive foreign matter will fall on the film layer. The protrusion of the foreign matter may puncture the OLED (Organic Light-Emitting Diode) vapor-deposited material, causing a short circuit between the anode and the cathode, resulting in dark spots in the pixels and affecting the yield.

[0066] Currently, a large positive voltage is usually applied to the anode through the first power line VDD, and a large negative voltage is applied to the cathode through the second power line VSS to burn out foreign matter (short-circuit point) and restore the pixel to normal display from a dark spot. However, since the voltage applied to the anode through the first power line VDD needs to pass through multiple transistors and multiple sections of wiring, the heat generated due to the excessive resistance of the transistors and wiring is too high (especially the wiring of the active layer is thinner and the resistance is larger), which easily causes the problem of circuit burns. At the same time, due to the limit of the on-voltage of the transistor, the voltage applied to the anode through the first power line VDD cannot be too large, resulting in poor dark spot elimination effect.

[0067] Based on this, the present application provides a pixel circuit solution to solve the above problems, with specific reference to the following embodiments.

[0068] Reference Figure 1 As shown, an embodiment of the present application discloses a pixel circuit 100, which includes a driving module, a light emitting module and a dark spot elimination module.

[0069] The first end of the driving module is connected to the first power line VDD, the cathode of the light-emitting module is connected to the second power line VSS, and the driving module is used to control the light-emitting module to emit light according to the control signal of its own control end during the light-emitting stage; the dark spot elimination module is connected to the first pole of the light-emitting module, and the dark spot elimination module is used to write the dark spot elimination voltage into the first pole of the light-emitting module during the dark spot elimination stage.

[0070] The first power line VDD is connected to the first power supply voltage, the second power line VSS is connected to the second power supply voltage, the first power supply voltage is a positive voltage, and the second power supply voltage is a negative voltage. In the dark spot elimination stage, the negative voltage on the second power line VSS is written to the second pole of the light-emitting module. Preferably, the dark spot elimination voltage includes 10V to 20V, such as 10V, 15V, 20V, etc. The dark spot elimination voltage can ensure that foreign objects are burned out, while avoiding circuit damage caused by excessive voltage.

[0071] Preferably, the dark spot elimination voltage is greater than the first voltage transmitted by the first power line VDD to enhance the dark spot elimination effect.

[0072] Optionally, the first pole of the light-emitting module is an anode, and the second pole of the light-emitting module is a cathode.

[0073] The pixel circuit 100 provided in this embodiment connects the dark spot elimination module to the anode of the light-emitting module. In the dark spot elimination stage, the dark spot elimination module is used to write the dark spot elimination voltage into the first electrode of the light-emitting module, thereby shortening the transmission path of the dark spot elimination voltage and preventing the dark spot elimination voltage from passing through transistors and multiple wiring segments. Therefore, the problem of excessive heat generated due to excessive resistance of transistors and multiple wiring segments, thereby preventing the problem of circuit burns, is avoided. At the same time, it is no longer limited by the on-voltage of the transistor, and a higher dark spot elimination voltage can be applied to improve the dark spot elimination effect.

[0074] Reference Figure 2 As shown, in one embodiment, the dark spot elimination module includes a connection line 1, which connects the first electrode of the light-emitting module in each pixel circuit 100 to the third power line Vhigh, and the third power line Vhigh is used to transmit the dark spot elimination voltage.

[0075] In the dark spot elimination stage, the dark spot elimination voltage is written into the first electrode of the light-emitting module in each pixel circuit 100 through the connection line 1. It is not necessary to prepare a dark spot elimination signal line Vhigh for each pixel circuit 100. Only one third power line Vhigh is needed in each display panel to provide the dark spot elimination voltage. The dark spot elimination voltage can be written into the first electrode of the light-emitting module in each pixel circuit 100 through each connection line 1, which is conducive to reducing costs and circuit complexity. Figure 3 As shown, in one embodiment, the dark spot elimination module also includes a first switch module, the control end of the first switch module is connected to the first switch control signal line V1, the first end of the first switch module is connected to the third power line Vhigh, and the other end is connected to the first pole of the light-emitting module, and the third power line Vhigh is used to transmit the dark spot elimination voltage; the first switch unit is used to respond to the signal on the first switch control signal line V1 to be turned on in the dark spot elimination stage, and turned off in other stages (such as the light-emitting stage).

[0076] Reference Figure 4 As shown, in one embodiment, the dark spot elimination module further includes a series connection unit 3, a first end of the series connection unit 3 is connected to the third power line Vhigh, and a second end is connected to the first poles of the light-emitting modules in at least two different pixel circuits. The series connection unit 3 is used to connect the first poles of the light-emitting modules in multiple different pixel circuits in series, and the dark spot elimination voltage in the third power line Vhigh can be transmitted to the first poles of the light-emitting modules in multiple different pixel circuits through the series connection unit 3. Specifically, the series connection unit includes one or more wires.

[0077] Reference Figure 5 As shown, in one embodiment, the dark spot elimination module further includes a second switch unit, the control end of the second switch unit is connected to the second switch control signal line V2, and the two ends of the second switch unit are connected to the first electrodes of the light-emitting modules in at least two different pixel circuits; the second switch unit is used to respond to the signal on the second switch control signal line V2 and turn on in the dark spot elimination stage, so as to facilitate the dark spot elimination voltage to the first electrode of the light-emitting module in each pixel circuit 100. The second switch unit is turned off in other stages to avoid interference with the first electrode of the light-emitting module in each pixel circuit 100, thereby affecting the normal dot screen effect.

[0078] Reference Figure 6 As shown, in one embodiment, the pixel circuit also includes a first reset module, the control end of the first reset module is connected to the first scanning signal line S1, the first end of the first reset module is connected to the control end of the driving module, and the second end of the first reset module is connected to the first reference signal line Vref1. The first reset module is used to reset the control end of the driving module to improve the driving effect of the driving module.

[0079] Please continue to refer to Figure 4 As shown, in one embodiment, the pixel circuit also includes a second reset module, the control end of the second reset module is connected to the third scanning signal line S3, the first end of the second reset module is connected to the anode of the light-emitting module, and the second end of the second reset module is connected to the second reference signal line Vref2. The second reset module is used to reset the anode of the light-emitting module to enhance the light-emitting effect of the light-emitting module.

[0080] Reference Figure 7As shown, in one embodiment, the pixel circuit 100 also includes a data writing module, the control end of the data writing module is connected to the second scanning signal line S2, the first end of the data writing module is connected to the data line Vdata, and the second end of the data writing module is connected to the first end of the driving module. The data writing module is used to respond to the signal on the second scanning signal line S2, and write a voltage related to the data voltage on the data line Vdata to the control end of the driving module in the data writing stage, so that the driving module can generate a driving current according to the data voltage in the light-emitting stage to drive the light-emitting module to emit light.

[0081] Reference Figure 8 As shown, in one embodiment, the pixel circuit 100 also includes a storage module, which is connected to the control end of the driving module and is used to store the voltage of the control end of the driving module; further, the storage module includes a storage capacitor, a first end of the storage capacitor is connected to the control end of the driving module, and a second end of the storage capacitor is connected to the first end of the driving module.

[0082] Please continue to refer to Figure 8 As shown, in one embodiment, the pixel circuit 100 further includes a compensation module, the control end of the compensation module is connected to the second scanning signal line S2, the first end of the compensation module is connected to the control end of the driving module, the second end of the compensation module is connected to the second end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module. Preferably, the compensation module is a dual-gate threshold compensation transistor. Compared with a single-gate transistor, a dual-gate transistor has a lower leakage current, which is beneficial to reducing the potential fluctuation of the gate of the driving module.

[0083] Reference Fig. 9 As shown, in one embodiment, the pixel circuit 100 also includes a first light-emitting control module, the control end of the first light-emitting control module is connected to the light-emitting control signal line EM, the first end of the first light-emitting control module is connected to the second end of the driving module, the second end of the first light-emitting control module is connected to the anode of the light-emitting module, and the first light-emitting control module is used to respond to the signal on the light-emitting control signal line EM to be turned on in the light-emitting stage and turned off in the aging stage.

[0084] Please continue to refer to Fig. 9 As shown, in one embodiment, the pixel circuit 100 also includes a second light-emitting control module, a first end of the second light-emitting control module is connected to the first end of the driving module, a control end of the second light-emitting control module is connected to the light-emitting control signal line EM, a second end of the second light-emitting control module is connected to the first power line VDD, and the second light-emitting control module is used to respond to the signal on the light-emitting control signal line EM and be turned on during the light-emitting stage, so as to avoid the light-emitting module from emitting light during the data writing stage.

[0085] In one embodiment, the pixel circuit 100 is a 7T1C circuit, and its connection relationship is detailed in Fig.10 In other embodiments, the pixel circuit 100 may be a 7T2C circuit, an 8T1C circuit, or other circuits, which are not specifically limited.

[0086] Please continue to refer to Fig.10 As shown, the driving module includes a transistor T1, the light-emitting module includes an OLED or an AMOLED, the data writing module includes a transistor T2, the compensation module includes a transistor T3, the first reset module includes a transistor T4, the first light-emitting control module includes a transistor T6, the second light-emitting control module includes a transistor T5, and the second reset module includes a transistor T7.

[0087] Reference Fig.11 As shown, another embodiment of the present application discloses a display panel 200, which includes the pixel circuit 100 in the above embodiment, and also includes a substrate 4, a first conductor layer M1, and a second conductor layer M2. The first conductor layer M1 is arranged on one side of the substrate 4, the second reference signal line Vref2 is located on the first conductor layer M1, the second conductor layer M2 is located on the side of the first conductor layer M1 away from the substrate 4, the first power line VDD and the third power line Vhigh are located on the second conductor layer M2, the light-emitting module is located on the side of the second conductor layer M2 away from the first conductor layer M1, and the first pole of the light-emitting module is electrically connected to the first power line VDD and the third power line Vhigh, wherein the dark spot elimination voltage transmitted by the third power line Vhigh is greater than the first voltage transmitted by the first power line VDD.

[0088] Among them, the signal on the second reference signal line Vref2 is written into the first pole of the light-emitting module, but the signal needs to pass through the transistor, that is, it needs to pass through the active layer, and the active layer has a thinner wiring and a larger resistance, which is prone to circuit burn problems. In this embodiment, the third power line Vhigh is routed through the second conductor layer M2, and the third power line Vhigh can be directly electrically connected to the first pole 2 of the light-emitting module, and the dark spot elimination voltage is written into the first pole 2 of the light-emitting module without passing through the transistor, thereby shortening the transmission path of the dark spot elimination voltage and reducing the risk of circuit burns.

[0089] Please continue to refer to Fig.11 As shown, in one embodiment, the display panel 200 further includes a fourth conductor layer M4, which is located on the side of the second conductor layer M2 away from the substrate 4, and the fourth conductor layer M4 includes a connection line 1, and the connection line 1 is connected to the first power line VDD and the third power line Vhigh through a via hole, and the side of the connection line 1 away from the second conductor layer M2 is connected to the first pole 2 of the light-emitting module through a via hole. Further, a first planarization layer 21 is provided between the second conductor layer M2 and the fourth conductor layer M4, a second planarization layer 22 is provided between the fourth conductor layer M4 and the first pole 2 of the light-emitting module, and via holes are provided on the first planarization layer 21 and the second planarization layer 22.

[0090] Please continue to refer to Fig.11 As shown, in one embodiment, the display panel 200 further includes a third conductor layer M3 and an active layer 10, the third conductor layer M3 is located on the side of the first conductor layer M1 facing the substrate 4, a portion of the third conductor layer M3 is used as a control terminal of the driving module, and the active layer 10 is located on the side of the third conductor layer M3 facing the substrate 4. The third conductor layer M3 is a gate layer, which is used to form the gate of the transistor.

[0091] Another embodiment of the present application discloses a pixel circuit driving method, which is applied to the pixel circuit 100 in the above embodiment, referring to Figure 1 The pixel circuit 100 includes a driving module, a light emitting module and a third power line Vhigh. The pixel circuit driving method includes the following steps:

[0092] Step S10: In the dark spot elimination stage, a dark spot elimination voltage is written to the first electrode of the light emitting module, and a second voltage is written to the second electrode of the light emitting module, and dark spot impurities are eliminated by the voltage difference between the dark spot elimination voltage and the second voltage.

[0093] The pixel circuit driving method provided in this embodiment shortens the transmission path of the dark spot elimination voltage by writing the dark spot elimination voltage to the first electrode of the light-emitting module during the dark spot elimination stage, and avoids the dark spot elimination voltage from passing through transistors and multiple wiring segments, thereby avoiding the problem of circuit burns caused by excessive heat generated due to excessive resistance of transistors and multiple wiring segments. At the same time, it is no longer limited by the on-voltage of the transistor, and a higher dark spot elimination voltage can be applied to improve the dark spot elimination effect.

[0094] Another embodiment of the present embodiment discloses a display device, which includes the display panel in the above embodiment. The display device can be mounted on a smart device (such as a mobile phone, VR device, computer, TV, car display, etc.).

[0095] The display device provided in this embodiment has a pixel circuit 100 that connects a dark spot elimination module to the anode of the light-emitting module. In the dark spot elimination stage, the dark spot elimination module is used to write the dark spot elimination voltage into the anode of the light-emitting module, thereby shortening the transmission path of the dark spot elimination voltage and preventing the dark spot elimination voltage from passing through transistors and multiple wiring segments. Therefore, the problem of circuit burns caused by excessive heat generated due to excessive resistance of transistors and multiple wiring segments is avoided. At the same time, it is no longer limited by the on-voltage of the transistor, and a higher dark spot elimination voltage can be applied to improve the dark spot elimination effect, which is beneficial to improving the display performance of the display device.

[0096] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0097] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0098] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A pixel circuit, characterized in that: include: Driving module, lighting module and dark spot elimination module; The first end of the driving module is connected to the first power line, the second end of the light emitting module is connected to the second power line, and the driving module is used to control the light emitting module to emit light according to the control signal of its control end in the light emitting stage; The dark spot elimination module is connected to the first electrode of the light emitting module, and is used to write a dark spot elimination voltage into the first electrode of the light emitting module during the dark spot elimination stage.

2. The pixel circuit according to claim 1, wherein: The dark spot elimination module includes a connecting line, which connects the first electrode of the light-emitting module in each pixel circuit to a third power line, and the third power line is used to transmit a dark spot elimination voltage; In the dark spot elimination stage, the dark spot elimination voltage is written into the first electrode of the light emitting module in each of the pixel circuits through the connecting line; Preferably, the dark spot elimination voltage is greater than a first voltage transmitted by the first power line.

3. The pixel circuit according to claim 1, wherein: The dark spot elimination module also includes: a first switch unit, wherein a control end of the first switch unit is connected to a first switch control signal line, one end of the first switch unit is connected to a third power line, and the other end of the first switch unit is connected to a first pole of the light-emitting module, and the third power line is used to transmit a dark spot elimination voltage; The first switch unit is used to respond to the signal on the first switch control signal line to be turned on during the dark spot elimination phase; Preferably, the dark spot elimination module further comprises a series unit, a first end of which is connected to the third power line, and a second end of which is connected to the first electrodes of the light-emitting modules in at least two different pixel circuits; Preferably, the dark spot elimination module further includes: A second switch unit, wherein a control end of the second switch unit is connected to a second switch control signal line, and two ends of the second switch unit are connected to first electrodes of the light-emitting modules in at least two different pixel circuits; The second switch unit is used to respond to the signal on the second switch control signal line and be turned on during the dark spot elimination phase.

4. The pixel circuit according to claim 1, wherein: The pixel circuit further includes: a first reset module, wherein a control end of the first reset module is connected to a first scanning signal line, a first end of the first reset module is connected to a control end of the driving module, a second end of the first reset module is connected to a first reference signal line, and the first reset module is used to reset the control end of the driving module; and / or A second reset module, wherein the control end of the second reset module is connected to the third scanning signal line, the first end of the second reset module is connected to the anode of the light-emitting module, the second end of the second reset module is connected to the second reference signal line, and the second reset module is used to reset the anode of the light-emitting module.

5. The pixel circuit according to claim 1, wherein: The pixel circuit further comprises: a data writing module, wherein a control end of the data writing module is connected to the second scanning signal line, a first end of the data writing module is connected to the data line, and a second end of the data writing module is connected to the first end of the driving module, and the data writing module is used to respond to a signal on the second scanning signal line and write a voltage related to the data voltage on the data line to the control end of the driving module during a data writing phase; Preferably, the pixel circuit further includes: a storage module, the storage module being connected to the control end of the driving module and being used to store the voltage of the control end of the driving module; Preferably, the storage module comprises a storage capacitor, a first end of the storage capacitor is connected to the control end of the driving module, and a second end of the storage capacitor is connected to the first end of the driving module.

6. The pixel circuit according to claim 1, wherein: The pixel circuit further comprises: a first light-emitting control module, wherein a control end of the first light-emitting control module is connected to a light-emitting control signal line, a first end of the first light-emitting control module is connected to a second end of the driving module, a second end of the first light-emitting control module is connected to an anode of the light-emitting module, and the first light-emitting control module is used to respond to a signal on the light-emitting control signal line to turn on in the light-emitting stage and turn off in the aging stage; a second light-emitting control module, wherein a first end of the second light-emitting control module is connected to a first end of the driving module, a control end of the second light-emitting control module is connected to a light-emitting control signal line, a second end of the second light-emitting control module is connected to the first power line, and the second light-emitting control module is used to respond to a signal on the light-emitting control signal line to be turned on during the light-emitting stage; Preferably, the pixel circuit further includes: A compensation module, wherein the control end of the compensation module is connected to the second scanning signal line, the first end of the compensation module is connected to the control end of the driving module, the second end of the compensation module is connected to the second end of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module.

7. A display panel, characterized in that: The display panel comprises the pixel circuit according to any one of claims 1 to 6, and the display panel further comprises: substrate; A first conductor layer is disposed on one side of the substrate, and a second reference signal line is located in the first conductor layer; A second conductor layer is located on a side of the first conductor layer away from the substrate, and the first power line and the third power line are located on the second conductor layer; The light emitting module is located at a side of the second conductor layer away from the first conductor layer, and the first electrode of the light emitting module is electrically connected to the first power line and the third power line; The dark spot elimination voltage transmitted by the third power line is greater than the first voltage transmitted by the first power line.

8. The display panel according to claim 7, wherein: The display panel further includes: a fourth conductor layer, located on a side of the second conductor layer away from the substrate, the fourth conductor layer comprising a connecting wire, the connecting wire being connected to the first power line and the third power line via holes, and the connecting wire being connected to the first pole via hole of the light emitting module on a side away from the second conductor layer; Preferably, the display panel further comprises: a third conductor layer, located on a side of the first conductor layer facing the substrate, a portion of the third conductor layer serving as a control terminal of the driving module; The active layer is located on a side of the third conductor layer facing the substrate.

9. A pixel circuit driving method, applied to the pixel circuit according to any one of claims 1 to 6, characterized in that: The method comprises: In the dark spot elimination stage, a dark spot elimination voltage is written into the first pole of the light emitting module, and a second voltage is written into the second pole of the light emitting module, and dark spot impurities are eliminated by the voltage difference between the dark spot elimination voltage and the second voltage.

10. A display device, characterized in that: Comprising the pixel circuit as described in any one of claims 1-6, or the display panel as described in any one of claims 7-8.

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