A pixel circuit, a driving method thereof, and a display panel

Abstract

An embodiment of the present invention discloses a pixel circuit, a driving method thereof, and a display panel. The pixel circuit includes a driving module, a first initialization module, a resistance compensation module, a data writing module, and a coupling module. There is a contact resistance between the light-emitting device and the first power supply signal; the first initialization module is configured to initialize the control terminal of the driving module in the initialization stage; the resistance compensation module is configured to output a resistance compensation signal in the compensation stage according to the contact resistance and the voltage division of the resistance compensation module; the first end of the coupling module is connected to the resistance compensation signal, and the second end of the coupling module is electrically connected to the control terminal of the driving module; the coupling module is configured to adjust the voltage of the control terminal of the driving module according to its coupling effect, and control the driving current generated by the driving module to vary positively with the value of the contact resistance. The technical solution of the embodiment of the present invention realizes the compensation for the display unevenness caused by the contact resistance of the display panel, and ensures the display effect of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technologies, and particularly to a pixel circuit, a driving method thereof, and a display panel. Background Art

[0002] Compared with LCD (Liquid Crystal Display) display panels, LED (Light Emitting Diode) display panels have greater advantages in terms of brightness, resolution, contrast, energy consumption, service life, response speed, and thermal stability. However, LED chips are usually transferred to a driving backplane through a mass transfer technology. Due to differences in the mass transfer technology, there is an unstable contact resistance between the LED chips and the driving backplane, resulting in the technical problem of uneven display in LED display panels. Summary of the Invention

[0003] Embodiments of the present invention provide a pixel circuit, a driving method thereof, and a display panel to compensate for uneven display caused by contact resistance in the display panel, thereby ensuring the display effect of the display panel.

[0004] In a first aspect, embodiments of the present invention provide a pixel circuit. The pixel circuit includes: a driving module for providing a driving current to a light-emitting device; wherein, a first pole of the light-emitting device is electrically connected to the driving module, a second pole of the light-emitting device is connected to a first power signal, and there is a contact resistance between the light-emitting device and the first power signal;

[0005] a first initialization module for initializing a control terminal of the driving module in an initialization stage;

[0006] a resistance compensation module for outputting a resistance compensation signal in a compensation stage according to the contact resistance and the voltage division of the resistance compensation module;

[0007] a data writing module for writing a data signal into the control terminal of the driving module in a data writing stage;

[0008] a coupling module, a first end of the coupling module is connected to the resistance compensation signal, and a second end of the coupling module is electrically connected to the control terminal of the driving module; the coupling module is used to adjust the voltage of the control terminal of the driving module according to its coupling effect, and control the driving current generated by the driving module to vary positively with the value of the contact resistance.

[0009] Optionally, a first end of the first initialization module is connected to a first initialization signal, a second end of the first initialization module is electrically connected to the control terminal of the driving module, and a control terminal of the first initialization module is connected to a first scan signal;

[0010] The resistance compensation module includes a first compensation unit and a second compensation unit; a first end of the first compensation unit is electrically connected to a first pole of the light-emitting device, a second end of the first compensation unit accesses a second initialization signal, and a control end of the first compensation unit accesses a second scan signal; a first end of the second compensation unit is electrically connected to the first pole of the light-emitting device, and a control end of the second compensation unit accesses a third scan signal;

[0011] The coupling module is electrically connected between a second end of the second compensation unit and a control end of the driving module;

[0012] Optionally, the coupling module includes a coupling capacitor; a first pole of the coupling capacitor serves as a first end of the coupling module, and a second pole of the coupling capacitor serves as a second end of the coupling module;

[0013] Optionally, the first compensation unit includes a first transistor, and the second compensation unit includes a second transistor; a first end of the first transistor serves as a first end of the first compensation unit, a second end of the first transistor serves as a second end of the first compensation unit, and a control end of the first transistor serves as a control end of the first compensation unit; a first end of the second transistor serves as a first end of the second compensation unit, a second end of the second transistor serves as a second end of the second compensation module, and a control end of the second transistor serves as a control end of the second compensation module.

[0014] Optionally, the pixel circuit further includes: a first end of the second initialization module accesses the first initialization signal, a second end of the second initialization module is electrically connected to the first end of the coupling module, and a control end of the second initialization module accesses the first scan signal;

[0015] Optionally, the first initialization module includes a third transistor; a first end of the third transistor serves as a first end of the first initialization module, a second end of the third transistor serves as a second end of the first initialization module, and a control end of the third transistor serves as a control end of the first initialization module;

[0016] Optionally, the second initialization module includes a fourth transistor; a first end of the fourth transistor serves as a first end of the second initialization module, a second end of the fourth transistor serves as a second end of the second initialization module, and a control end of the fourth transistor serves as a control end of the second initialization module.

[0017] Optionally, a second power signal is applied to the first end of the driving module; the pixel circuit further includes: a voltage compensation module electrically connected between the control end of the driving module and the second end of the driving module, and the voltage compensation module is configured to compensate the threshold voltage and / or the power supply voltage of the control end of the driving module during the compensation phase;

[0018] Optionally, the voltage compensation module includes a fifth transistor, a first end of the fifth transistor is electrically connected to the control end of the driving module, a second end of the fifth transistor is electrically connected to the second end of the driving module, and a control end of the fifth transistor receives a fourth scanning signal.

[0019] Optionally, the pixel circuit further includes: a light emission control module; the light emission control module is configured to control the light emitting device to emit light during the light emission phase and control the light emitting device not to emit light during phases other than the light emission phase.

[0020] Optionally, a first end of the data writing module is electrically connected to a first end of the coupling module, a second end of the data writing module receives the data signal, and a control end of the data writing module receives a fifth scanning signal;

[0021] Optionally, the data writing module includes a sixth transistor, a first end of the sixth transistor serves as the first end of the data writing module, a second end of the sixth transistor serves as the second end of the data writing module, and a control end of the sixth transistor serves as the control end of the data writing module.

[0022] Optionally, the second end of the driving module is electrically connected to the resistance compensation module; a first end of the data writing module is electrically connected to the first end of the driving module, a second end of the data writing module receives the data signal, and a control end of the data writing module receives a fifth scanning signal;

[0023] Optionally, the data writing module includes a sixth transistor, a first end of the sixth transistor serves as the first end of the data writing module, a second end of the sixth transistor serves as the second end of the data writing module, and a control end of the sixth transistor serves as the control end of the data writing module.

[0024] In a second aspect, an embodiment of the present invention further provides a display panel, and the display panel includes the pixel circuit as described in the first aspect above.

[0025] In a third aspect, an embodiment of the present invention further provides a driving method for a pixel circuit, the method is used to drive the pixel circuit as described in the first aspect above, and the method includes:

[0026] In the initialization stage, control the first initialization module to conduct, and initialize the control end of the driving module;

[0027] In the compensation stage, control the resistance compensation module to conduct. The resistance compensation module outputs a resistance compensation signal according to the contact resistance and the voltage division output resistance of the resistance compensation module;

[0028] In the data writing stage, control the data writing module to conduct. The data writing module writes a data signal to the control end of the driving module, and the coupling module adjusts the voltage of the control end of the driving module according to its coupling effect, and controls the driving current generated by the driving module to change positively with the resistance value of the contact resistance.

[0029] Optionally, the resistance compensation module includes a first compensation unit. The first end of the first compensation unit is electrically connected to the first pole of the light-emitting device. The second end of the first compensation unit accesses a second initialization signal, and the control end of the first compensation unit accesses a second scan signal;

[0030] Correspondingly, in the compensation stage, the second scan signal controls the first compensation unit to conduct, and the resistance compensation module outputs a resistance compensation signal according to the contact resistance and the voltage division of the first compensation unit; wherein, the second scan signal controls the current flowing through the resistance compensation module to be less than the light-emitting threshold current of the light-emitting device.

[0031] Optionally, in the initialization stage, it further includes: the second scan signal controls the first compensation unit to conduct, and the second initialization signal initializes the first pole of the light-emitting device.

[0032] The pixel circuit provided by the embodiment of the present invention adds a resistance compensation module and a coupling module. The resistance compensation module outputs a resistance compensation signal in the compensation stage according to the contact resistance and the voltage division of the resistance compensation module. The coupling module accesses the resistance compensation signal and adjusts the voltage of the control end of the driving module according to its own coupling effect, and controls the driving current generated by the driving module to change positively with the resistance value of the contact resistance, so that the resistance compensation signal containing the resistance value of the contact resistance is compensated to the control end of the driving module, and the magnitude of the driving current generated by the driving control module increases as the resistance value of the contact resistance increases, thereby ensuring that the driving current flowing through the light-emitting device increases as the resistance value of the contact resistance increases, and avoiding the driving current flowing through the light-emitting device from decreasing due to the existence or increase of the contact resistance, resulting in a small light-emitting brightness of the light-emitting device. This embodiment realizes the compensation for the display unevenness of the display panel caused by the contact resistance, makes the display of the display panel uniform, and ensures the display effect of the display panel. Description of the Drawings

[0033] Figure 1It is a schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0034] Figure 2 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0035] Figure 3 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0036] Figure 4 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0037] Figure 5 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0038] Figure 6 It is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0039] Figure 7 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0040] Figure 8 It is a driving timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0041] Figure 9 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0042] Figure 10 It is a driving timing diagram of another pixel circuit provided by an embodiment of the present invention. Detailed implementation manners

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the accompanying drawings rather than all the structures.

[0044] As described in the background art, currently, there are still technical problems of uneven display in Micro LED display panels. After research by the inventor, the reasons are as follows:

[0045] During the mass transfer process, the LED chip is pressed onto the driver backplane through anisotropic conductive film (ACF) or In column and electrically connected to the driver backplane. However, due to various uncertainties such as process control differences during each mass transfer, ACF batch differences, surface resistance differences of the In column of the driver backplane, or poor contact between the LED chip and the driver backplane, an unstable resistance (this unstable resistance can also be called contact resistance or bonding resistance) exists between the LED chip and the driver backplane. When the display panel displays an image, if the resistance of the contact resistance is slightly large, the driving current flowing through the LED chip will be reduced to a certain extent, so that the luminous brightness at the corresponding position of the display image will be smaller, especially when the display panel displays a monochrome image, which can be more obviously seen, that is, the display panel has an uneven display phenomenon. It can be seen that the contact resistance between the LED chip and the driver backplane causes the display panel to display unevenly, affecting the display effect of the display panel.

[0046] In view of this, an embodiment of the present invention provides a pixel circuit. Figure 1 Schematic diagram of a pixel circuit according to an embodiment of the present invention. Figure 1 The pixel circuit includes a driver module 10, a first initialization module 20, a resistance compensation module 30, a data writing module 40, and a coupling module 50. The driver module 10 is configured to provide a driving current to the light-emitting device D. The first terminal of the light-emitting device D is electrically connected to the driver module 10, and the second terminal of the light-emitting device D is connected to the first power supply signal VSS. A contact resistance RX exists between the light-emitting device D and the first power supply signal VSS. The first initialization module 20 is configured to initialize the control terminal c1 of the driver module 10 during the initialization phase. The resistance compensation module 30 is configured to output a resistance compensation signal Vx during the compensation phase based on the contact resistance RX and the voltage divided by the resistance compensation module 30. The data writing module 40 is configured to write a data signal DATA to the control terminal c1 of the driver module 10 during the data writing phase. The first terminal A of the coupling module 50 is connected to the resistance compensation signal Vx, and the second terminal B of the coupling module 50 is electrically connected to the control terminal c1 of the driver module 10. The coupling module 50 is configured to adjust the voltage at the control terminal c1 of the driver module 10 based on its coupling action, so that the driving current generated by the driver module 10 changes in a positive direction with the resistance value of the contact resistance RX.

[0047] The driver module 10 includes a first terminal a1, a second terminal b1, and a control terminal c1. The voltage at the control terminal c1 determines the magnitude of the driving current generated by the driver module 10. The light-emitting device D can be an LED chip or other light-emitting device having a contact resistance with the driver backplane. In the following embodiments, the first electrode of the light-emitting device D is an anode and the second electrode is a cathode, but this is not intended to limit the present invention. It should also be noted thatFigure 1 The shown contact resistance RX is the equivalent resistance existing between the cathode of the light-emitting device D and the first power supply signal VSS, rather than an actual component.

[0048] Exemplarily, the working process of the pixel circuit can be divided into an initialization stage, a compensation stage, a data writing stage, and a light-emitting stage that are carried out in sequence.

[0049] In the initialization stage and the compensation stage: control the first initialization module 20 to conduct, and initialize the control terminal c1 of the driving module 10; control the resistance compensation module 30 to conduct, and the resistance compensation module 30 outputs a resistance compensation signal Vx according to the voltage division of the contact resistance RX and the resistance compensation module 30. Among them, when the resistance compensation module 30 is conducting, there is a certain internal resistance. Based on the voltage division characteristics of the resistance compensation module 30 and the contact resistance RX, the resistance compensation signal Vx output by the resistance compensation module 30 is related to the magnitude of the contact resistance RX. Therefore, the resistance compensation signal Vx is a voltage signal containing the resistance value of the contact resistance RX, that is, in the embodiment of the present invention, by setting the resistance compensation module 30, the resistance value of the contact resistance RX is converted into a voltage signal and output from the resistance compensation module 30. Exemplarily, when the contact resistance RX is larger, the resistance compensation signal Vx is larger; when the contact resistance RX is smaller, the resistance compensation signal Vx is smaller. And in this stage, the resistance compensation signal Vx is written into the first terminal A of the coupling module 50, and the initialization signal for initializing the control terminal c1 of the driving module 10 is written into the second terminal B of the coupling module 50.

[0050] In the data writing stage and the light-emitting stage: control the data writing module 40 to conduct, and the data writing module 40 writes the data signal DATA into the control terminal c1 of the driving module 10, and the coupling module 50 adjusts the voltage of the control terminal c1 of the driving module 10 according to its coupling effect, and controls the driving current generated by the driving module 10 to change positively with the resistance value of the contact resistance RX. Specifically, due to the coupling effect of the coupling module 50, when the data signal DATA is written into the first terminal A of the coupling module 50, the voltage change amount of the first terminal A is DATA - Vx, and the second terminal B of the coupling module also changes accordingly, and the change amount is DATA - Vx, so that the voltage of the control terminal c1 of the driving module 10 is related to the resistance compensation signal Vx, and being related to the resistance compensation signal Vx means being related to the resistance value of the contact resistance RX, that is, in the embodiment of the present invention, by setting the coupling module 50, the voltage signal containing the resistance value of the contact resistance RX is compensated to the control terminal c1 of the driving module 10.

[0051] On this basis, the driving current generated by the driving module 10 is controlled to vary positively with the resistance value of the contact resistance RX. For example, the magnitude of the driving current generated by the driving module 10 decreases as the resistance value of the contact resistance RX decreases, so that the driving current flowing through the light-emitting device D decreases as the resistance value of the contact resistance RX decreases; the magnitude of the driving current generated by the driving module 10 increases as the resistance value of the contact resistance RX increases, so that the driving current flowing through the light-emitting device D increases as the resistance value of the contact resistance RX increases. This avoids the reduction of the driving current flowing through the light-emitting device D due to the existence or increase of the contact resistance RX, resulting in a relatively low light-emitting brightness of the light-emitting device D. According to this, the embodiment of the present invention realizes the compensation for the display unevenness of the display panel caused by the contact resistance RX, making the display of the display panel uniform and ensuring the display effect of the display panel.

[0052] On the basis of the above embodiments, there are various setting methods and connection methods for the resistance compensation module 30 and the data writing module 40, and other functional modules can also be added to the pixel circuit. Correspondingly, the driving processes of the pixel circuits are also different. Specific limitations are as follows.

[0053] Figure 2 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention. Refer to Figure 2 , in an embodiment of the present invention, optionally, the first end a2 of the first initialization module 20 is connected to the first initialization signal VINIT, the second end b2 of the first initialization module 20 is electrically connected to the control end c1 of the driving module 10, and the control end c2 of the first initialization module 20 is connected to the first scan signal Scan1; the resistance compensation module 30 includes a first compensation unit 31 and a second compensation unit 32; the first end a31 of the first compensation unit 31 is electrically connected to the first pole of the light-emitting device D, the second end b31 of the first compensation unit 31 is connected to the second initialization signal VREF, and the control end c31 of the first compensation unit 31 is connected to the second scan signal Scan2; the first end a32 of the second compensation unit 32 is electrically connected to the first pole of the light-emitting device D, and the control end c32 of the second compensation unit 32 is connected to the third scan signal Scan3; the coupling module 50 is electrically connected between the second end b32 of the second compensation unit 32 and the control end c1 of the driving module 10.

[0054] Among them, the first scan signal Scan1 is used to control the conduction or cut-off of the first initialization module 20. For example, it controls the first initialization module 20 to conduct during the initialization stage and the compensation stage, and cut off during the data writing stage and the light emitting stage. The second scan signal Scan2 is used to control the conduction, cut-off or conduction degree of the first compensation unit 31. For example, it controls the conduction degree of the first compensation unit 31 to be relatively small during the initialization stage and the compensation stage, and cut off during the data writing stage and the light emitting stage. The third scan signal Scan3 is used to control the conduction or cut-off of the second compensation unit 32. For example, it controls the second compensation unit 32 to conduct during the initialization stage and the compensation stage, and cut off during the data writing stage and the light emitting stage.

[0055] Exemplarily, the principle of the resistance compensation module 30 to output the resistance compensation signal Vx is as follows: when controlling both the first compensation unit 31 and the second compensation unit 32 to conduct, the second initialization signal VREF is written into the first pole of the light emitting device D through the first compensation unit 31, and there is current flowing through the light emitting device D. During this process, the resistance value of the light emitting device D is small and can be ignored. The second scan signal Scan2 controls the conduction degree of the first compensation unit 31 to be relatively small, so that the first compensation unit 31 has a certain resistance value (this resistance value is the internal resistance existing when the resistance compensation module 30 is conducting). The first compensation unit 31 and the contact resistance RX can divide the voltage of the second initialization signal VREF, that is, divide the second initialization signal VREF at the node E, so that the resistance compensation signal Vx is output at the node E. Since the third scan signal Scan3 controls the conduction degree of the second compensation unit 32 to be relatively large, the resistance value of the second compensation unit 32 can be ignored, and the second compensation unit 32 transmits the resistance compensation signal Vx completely to the first end A of the coupling module 50.

[0056] It can be seen that in this embodiment, by setting the resistance compensation module 30 to include the first compensation unit 31 and the second compensation unit 32, and setting the coupling module 50 to be electrically connected between the second end b32 of the second compensation unit 32 and the control end c1 of the driving module 10, the first compensation unit 31 converts the resistance value of the contact resistance RX into a voltage signal according to the voltage division of the contact resistance RX and the first compensation unit 31, so that the resistance compensation signal Vx is a voltage signal containing the resistance value of the contact resistance RX. Furthermore, the second compensation unit 32 transmits the resistance compensation signal Vx to the first end A of the coupling module 50, so that after receiving the resistance compensation signal Vx, the coupling module 50 can adjust the voltage of the control end c1 of the driving module 10 based on its own coupling effect, and control the driving current generated by the driving module 10 to change positively with the resistance value of the contact resistance RX.

[0057] Figure 3 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention. Refer to Figure 3, in an embodiment of the present invention, the coupling module 50 includes a coupling capacitor C; the first pole of the coupling capacitor C serves as the first end A of the coupling module 50, and the second pole of the coupling capacitor C serves as the second end B of the coupling module 50. Among them, compared with other components having a coupling effect, the coupling capacitor C can be fabricated in the same manufacturing process as other devices of the pixel circuit. Therefore, the embodiment of the present invention simplifies the circuit structure, reduces the manufacturing cost, and is easy to implement.

[0058] Figure 4 is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention. Refer to Figure 4 , in an embodiment of the present invention, the first compensation unit 31 includes a first transistor M1, and the second compensation unit 32 includes a second transistor M2; the first end of the first transistor M1 serves as the first end a31 of the first compensation unit 31, the second end of the first transistor M1 serves as the second end b31 of the first compensation unit 31, and the control end of the first transistor M1 serves as the control end c31 of the first compensation unit 31; the first end of the second transistor M2 serves as the first end a32 of the second compensation unit 32, the second end of the second transistor M2 serves as the second end b32 of the second compensation unit 32, and the control end of the second transistor M2 serves as the control end c32 of the second compensation unit 32.

[0059] Among them, the second scan signal Scan2 can control the first transistor M1 to be not fully turned on, with a relatively small conduction degree. For example, it controls the first transistor M1 to operate in a region close to the linear region in the cut-off region, so as to ensure that the first transistor M1 has a relatively large equivalent resistance, so that the first compensation unit 31 has a certain resistance value to achieve voltage division with the contact resistance RX. This equivalent resistance can be equal to the resistance value of the first compensation unit 31, and at the same time, it is also beneficial to ensure that the current flowing through the first transistor M1 is less than the light-emitting threshold current of the light-emitting device D, thereby avoiding the light-emitting device D from emitting light; the third scan signal Scan3 can control the second transistor M2 to be fully turned on. For example, it controls the second transistor M2 to operate in the saturation region, so as to avoid distortion of the output resistance compensation signal Vx.

[0060] Figure 5 is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention. Refer to Figure 5 , in an embodiment of the present invention, the first initialization module 20 includes a third transistor M3; the first end of the third transistor M3 serves as the first end a2 of the first initialization module 20, the second end of the third transistor M3 serves as the second end b2 of the first initialization module 20, and the control end of the third transistor M3 serves as the control end c2 of the first initialization module 20.

[0061] Continue to refer to Figure 5, in an embodiment of the present invention, the data writing module 40 includes a sixth transistor M6; a first end of the sixth transistor M6 is connected to a first end A of the coupling module 50; a second end of the sixth transistor M6 accesses a data signal DATA; a control end of the sixth transistor M6 accesses a fifth scan signal Scan5. Among them, the fifth scan signal Scan5 is used to control the on or off of the sixth transistor M6. For example, it controls the sixth transistor M6 to be off in the initialization stage and the compensation stage, and on in the data writing stage and the light emitting stage.

[0062] The working principle of the pixel circuit provided in this embodiment will be described in detail below. Among them, the driving transistor M0, the first transistor M1, the second transistor M2, the third transistor M3, and the sixth transistor M6 can all be N-type transistors or P-type transistors. Here, only the case where they are all P-type transistors is taken as an example for illustration. Figure 6 is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention. Combining Figure 5 and Figure 6 , the initialization stage and the compensation stage are executed in the same stage, and the data writing stage and the light emitting stage are executed in the same stage. The working principle of the pixel circuit includes:

[0063] Initialization stage and compensation stage, that is, the H1 period: the first scan signal Scan1 controls the third transistor M3 to be on, the second scan signal Scan2 controls the first transistor M1 to be on (the first transistor M1 can be controlled to work in a region close to the linear region of the cut-off region), the third scan signal Scan3 controls the second transistor M2 to be on, and the rest of the transistors are all off.

[0064] In this way, the first initialization signal VINIT initializes the second pole of the coupling capacitor C, that is, initializes the control end of the driving transistor M0; and, the first transistor M1 and the contact resistance RX divide the voltage of the second initialization signal VREF, and the second transistor M2 transmits the voltage at node E, that is, the resistance compensation signal Vx, to the first pole of the coupling capacitor C. Among them, the voltage at node E changes with the change of the contact resistance RX: when the resistance value of the contact resistance RX increases, the voltage at node E increases; when the resistance value of the contact resistance RX decreases, the voltage at node E decreases.

[0065] Data writing stage and light emitting stage, that is, the H2 period: the fifth scan signal Scan5 controls the sixth transistor M6 to be on, and the rest of the transistors are all off.

[0066] In this way, the data signal DATA is written into the first pole of the coupling capacitor C, and the voltage of the first pole of the coupling capacitor C changes from the previous resistance compensation signal Vx to the data signal DATA; furthermore, based on its coupling effect, the coupling capacitor C causes the voltage of the second pole of the coupling capacitor C to change from the previous first initialization signal VINIT to VINIT + DATA - Vx, that is, based on its coupling effect, the coupling capacitor C causes the voltage of the control terminal of the driving transistor M0 to change to VINIT + DATA - Vx. Subsequently, the driving transistor M0 generates a driving current in response to the voltage of its control terminal, and the light-emitting device emits light in response to the driving current.

[0067] It can be seen that when the contact resistance RX increases, the voltage at node E, that is, the resistance compensation signal Vx increases, and the voltage of the control terminal of the driving transistor M0 decreases. As a result, the driving transistor M0 is turned on more, the driving current output by the driving transistor M0 increases, and further, the driving current flowing through the light-emitting device D increases, thereby avoiding a decrease in the driving current flowing through the light-emitting device D due to the presence or increase of the contact resistance RX, which may cause the light-emitting brightness of the light-emitting device D to be too low. According to this embodiment, the compensation for the display unevenness of the display panel caused by the contact resistance RX is realized, making the display of the display panel uniform and ensuring the display effect of the display panel.

[0068] Figure 7 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention. Refer to Figure 7 , in an embodiment of the present invention, optionally, the pixel circuit further includes: a second initialization module 60. In this embodiment, the first initialization module 20 is set to initialize the control terminal c1 of the driving module 10 in the initialization stage, so as to facilitate the data writing module 40 to write the data signal DATA into the control terminal c1 of the driving module 10 in the data writing stage; and the second initialization module 60 is set to initialize the first terminal A of the coupling module 50, so as to facilitate the accurate writing of the resistance compensation signal Vx into the first terminal A of the coupling module 50, and further ensure that the voltage of the control terminal c1 of the driving module 10 is more accurately related to the resistance compensation signal Vx, and ensure that the driving current generated by the driving module 10 changes positively more accurately with the resistance value of the contact resistance RX.

[0069] Continue to refer to Figure 7 , in an embodiment of the present invention, the first terminal a6 of the second initialization module 60 is connected to the first initialization signal VINIT, the second terminal b6 of the second initialization module 60 is electrically connected to the first terminal A of the coupling module 50, and the control terminal c6 of the second initialization module 60 is connected to the first scan signal Scan1. The first scan signal Scan1 is also used to control the conduction or cut-off of the second initialization module 60, for example, to control the second initialization module 60 to conduct in the initialization stage and cut off in stages other than the initialization stage.

[0070] Continue to refer to Figure 7 In an embodiment of the present invention, the second initialization module 60 includes a fourth transistor M4; the first end of the fourth transistor M4 serves as the first end a6 of the second initialization module 60, the second end of the fourth transistor M4 serves as the second end b6 of the second initialization module 60, and the control end of the fourth transistor M4 serves as the control end c6 of the second initialization module 60. In the pixel circuit of the embodiment of the present invention, by only setting the fourth transistor M4, it can be ensured that the driving current generated by the driving module 10 changes positively more precisely with the resistance value of the contact resistance RX, and the circuit structure is simple and easy to implement.

[0071] Continue to refer to Figure 7 In an embodiment of the present invention, the first end a1 of the driving module 10 is connected to a second power supply signal VDD; the pixel circuit further includes: a voltage compensation module 70, the voltage compensation module 70 is electrically connected between the control end c1 and the second end b1 of the driving module 10, and the voltage compensation module 70 is used to compensate the threshold voltage VTH and / or the power supply voltage of the control end c1 of the driving module 10 during the compensation phase.

[0072] Among them, the first end of the driving transistor M0 serves as the first end a1 of the driving module 10, the second end of the driving transistor M0 serves as the second end b1 of the driving module 10, and the control end of the driving transistor M0 serves as the control end c1 of the driving module 10. The voltage compensation module 70 writes the threshold voltage VTH of the driving transistor M0 into the control end of the driving transistor M0 to compensate the threshold voltage VTH of the control end of the driving transistor M0, so that the driving current generated by the driving transistor M0 is independent of the threshold voltage VTH of the driving transistor M0, thereby avoiding the influence of the structural characteristics of the driving transistor M0 itself on the driving current; at the same time, the voltage compensation module 70 can also write the second power supply signal VDD into the control end of the driving transistor M0 to compensate the power supply voltage of the control end of the driving transistor M0, so that the driving current generated by the driving transistor M0 is independent of the second power supply signal VDD, thereby avoiding the influence of the voltage drop of the power supply line providing the second power supply signal VDD on the driving current.

[0073] Continue to refer to Figure 7, in an embodiment of the present invention, the voltage compensation module 70 includes a fifth transistor M5. The first end of the fifth transistor M5 serves as the first end a7 of the voltage compensation module 70. The first end of the fifth transistor M5 is electrically connected to the control end c1 of the driving module 10. The second end of the fifth transistor M5 serves as the second end b7 of the voltage compensation module 70. The second end of the fifth transistor M5 is electrically connected to the second end b1 of the driving module 10. The control end of the fifth transistor M5 serves as the control end c7 of the voltage compensation module 70. The control end of the fifth transistor M5 receives the fourth scan signal Scan4. The pixel circuit of the embodiment of the present invention is provided with a voltage compensation module 70 that only includes one fifth transistor M5, and the circuit structure is simple and easy to implement.

[0074] Continue to refer to Figure 7 , in an embodiment of the present invention, the first end a4 of the data writing module 40 is electrically connected to the first end A of the coupling module 50. The second end b4 of the data writing module 40 receives the data signal DATA. The control end c4 of the data writing module 40 receives the fifth scan signal Scan5. Continue to refer to Figure 7 Or Figure 5 , the first end of the sixth transistor M6 serves as the first end a4 of the data writing module 40. The second end of the sixth transistor M6 serves as the second end b4 of the data writing module 40. The control end of the sixth transistor M6 serves as the control end c4 of the data writing module 40.

[0075] Continue to refer to Figure 7 , in an embodiment of the present invention, the pixel circuit further includes: a light emission control module 80. The light emission control module 80 is used to control the light emitting device D to emit light during the light emission stage and control the light emitting device D not to emit light during stages other than the light emission stage. For example, it controls the light emitting device D not to emit light during the initialization stage, the compensation stage, and the data writing stage, so as to ensure the display effect of the display panel.

[0076] Continue to refer to Figure 7 , in an embodiment of the present invention, the first end of the light emission control module 80 is electrically connected to the second end b1 of the driving module 10. The second end of the light emission control module 80 is electrically connected to the first pole of the light emitting device D. The control end of the light emission control module 80 is electrically connected to the sixth scan signal Scan6.

[0077] Continue to refer to Figure 7, in an embodiment of the present invention, the light emission control module 80 includes a seventh transistor M7. The first end of the seventh transistor M7 serves as the first end of the light emission control module 80, the second end of the seventh transistor M7 serves as the second end of the light emission control module 80, and the control end of the seventh transistor M7 serves as the control end of the light emission control module 80. The pixel circuit according to the embodiment of the present invention is provided with a light emission control module 80 that only includes one seventh transistor M7, and the circuit structure is simple and easy to implement.

[0078] The working principle of the pixel circuit provided in this embodiment will be described in detail below, and this description can be applied to Figure 7 the pixel circuit shown in the figure; among them, the driving transistor M0, the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, and the seventh transistor M7 can all be N-type transistors or P-type transistors. Here, only the case where they are all P-type transistors is used as an example for illustration. Figure 8 is the driving timing diagram of another pixel circuit provided by the embodiment of the present invention. Combining Figures 1 to 8 , the initialization stage T1 and the compensation stage T2 are executed separately, and the data writing stage T3 and the light emission stage T4 are executed separately. The working principle of the pixel circuit includes:

[0079] Initialization stage T1: The first scan signal Scan1 controls the third transistor M3 and the fourth transistor M4 to conduct, and the rest of the transistors are all turned off. In this way, the first initialization signal VINIT initializes the first pole and the second pole of the coupling capacitor C at the same time and separately, and initializes the control end of the driving transistor M0.

[0080] Optionally, in the initialization stage T1, it may further include that the second scan signal Scan2 controls the first transistor M1 to conduct, so as to initialize the anode of the light-emitting device D through the second initialization signal VREF. The magnitude of the second initialization signal VREF in the initialization stage T1 may be different from the magnitude of the second initialization signal VREF in the compensation stage T2, so as to ensure the full initialization of the anode of the light-emitting device D in the initialization stage T1 and also ensure that the light-emitting device D does not emit light in the compensation stage T2.

[0081] Compensation stage T2: The second scan signal Scan2 controls the first transistor M1 to conduct (the first transistor M1 can be controlled to operate in the saturation region during the initialization stage T1, and the first transistor M1 can be controlled to operate in the region close to the linear region in the cut-off region during the compensation stage T2), the third scan signal Scan3 controls the second transistor M2 to conduct, and the fourth scan signal Scan4 controls the fifth transistor M5 to conduct, and the rest of the transistors are turned off. In this way, the second power supply signal VDD is written into the control terminal of the driving transistor M0 through the driving transistor M0 and the fifth transistor M5, and the voltage of the control terminal of the driving transistor M0 gradually increases until it becomes VDD + VTH, the driving transistor M0 is turned off, and the voltage of the second pole of the coupling capacitor C is VDD + VTH; moreover, the first transistor M1 and the contact resistance RX divide the voltage of the second initialization signal VREF, and the second transistor M2 transmits the voltage at node E, that is, the resistance compensation signal Vx, to the first pole of the coupling capacitor C.

[0082] Data writing stage T3: The fifth scan signal Scan5 controls the sixth transistor M6 to conduct, and the rest of the transistors are turned off. In this way, the data signal DATA is written into the first pole of the coupling capacitor C, and the voltage of the first pole of the coupling capacitor C changes from the previous resistance compensation signal Vx to the data signal DATA; furthermore, based on its coupling effect, the coupling capacitor C makes the voltage of the second pole of the coupling capacitor C change from the previous VDD + VTH to VDD + VTH + DATA - Vx, that is, based on its coupling effect, the coupling capacitor C makes the voltage of the control terminal of the driving transistor M0 change to VDD + VTH + DATA - Vx.

[0083] It can be seen that when the contact resistance RX increases, the voltage of the control terminal of the driving transistor M0 decreases, so that the driving transistor M0 is turned on more, the driving current output by the driving transistor M0 increases, and further the driving current flowing through the light-emitting device D increases, thereby avoiding the decrease in the driving current flowing through the light-emitting device D caused by the presence or increase of the contact resistance RX, resulting in a small light-emitting brightness of the light-emitting device D. According to this embodiment, the compensation for the display unevenness of the display panel caused by the contact resistance RX is realized, making the display of the display panel uniform and ensuring the display effect of the display panel.

[0084] Light-emitting stage T4: The sixth scan signal Scan6 controls the seventh transistor M7 to conduct, and the rest of the transistors are turned off. In this way, the light-emitting device D emits light in response to the driving current.

[0085] The technical solution of this embodiment is not only applicable to the above pixel circuit, but also applicable to the 7T1C pixel circuit. Figure 9 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention. Refer to Figure 9 , and Figure 7Differently, the first terminal a6 of the second initialization module 60 is connected to the first initialization signal VINIT, the second terminal b6 of the second initialization module 60 is electrically connected to the first terminal A of the coupling module 50, and the control terminal c6 of the second initialization module 60 is connected to the seventh scan signal Scan7; the second terminal b1 of the driving module 10 is electrically connected to the resistor compensation module 30; the first terminal a4 of the data writing module 40 is electrically connected to the first terminal a1 of the driving module 10, the second terminal b4 of the data writing module 40 is connected to the data signal DATA, and the control terminal c4 of the data writing module 40 is connected to the fifth scan signal Scan5.

[0086] Among them, the seventh scan signal Scan7 is used to control the on or off of the second initialization module 60. For example, it controls the second initialization module 60 to be on during the initialization stage, data writing, and threshold compensation stages, and off during other stages. Continue to refer to Figure 9 or Figure 7 , in an embodiment of the present invention, the first terminal of the fourth transistor M4 serves as the first terminal a6 of the second initialization module 60, the second terminal of the fourth transistor M4 serves as the second terminal b6 of the second initialization module 60, and the control terminal of the fourth transistor M4 serves as the control terminal c6 of the second initialization module 60.

[0087] Continue to refer to Figure 9 , in an embodiment of the present invention, the data writing module 40 includes a sixth transistor M6. The first terminal of the sixth transistor M6 serves as the first terminal a4 of the data writing module 40, the second terminal of the sixth transistor M6 serves as the second terminal b4 of the data writing module 40, and the control terminal of the sixth transistor M6 serves as the control terminal c4 of the data writing module 40. The pixel circuit of the embodiment of the present invention sets that the data writing module 40 only includes one sixth transistor M6, and the circuit structure is simple and easy to implement.

[0088] Continue to refer to Figure 9 , in an embodiment of the present invention, the pixel circuit further includes a storage capacitor C2. The first pole of the storage capacitor C2 is connected to the first power signal VDD, and the second pole of the storage capacitor C2 is electrically connected to the control terminal a1 of the driving module 10. The storage capacitor C2 stores the data signal DATA written through the data writing module 40 to maintain the potential of the control terminal c1 of the driving module 10 during the light-emitting stage of the light-emitting device D, so as to ensure the stable light emission of the light-emitting device D during the light-emitting stage.

[0089] Continue to refer to Figure 9, in an embodiment of the present invention, the light emission control module 80 includes a first light emission control unit 81 and a second light emission control unit 82; a first end of the first light emission control unit 81 is electrically connected to a first pole of the light emitting device D, a second end of the first light emission control unit 81 is electrically connected to a second end b1 of the driving module 10, and a control end of the first light emission control unit 81 accesses a sixth scan signal Scan6; a first end of the second light emission control unit 82 accesses a second power supply signal VDD, a second end of the second light emission control unit 82 is electrically connected to a first end a1 of the driving module 10, and a control end of the second light emission control unit 82 is electrically connected to the sixth scan signal Scan6.

[0090] Continue to refer to Figure 9 , in an embodiment of the present invention, the first light emission control unit 81 includes a seventh transistor M7, a first end of the seventh transistor M7 serves as the first end of the first light emission control unit 81, a second end of the seventh transistor M7 serves as the second end of the first light emission control unit 81, and a control end of the seventh transistor M7 serves as the control end of the first light emission control unit 81; the second light emission control unit 82 includes an eighth transistor M8, a first end of the eighth transistor M8 serves as the first end of the second light emission control unit 82, a second end of the eighth transistor M8 serves as the second end of the second light emission control unit 82, and a control end of the eighth transistor M8 serves as the control end of the second light emission control unit 82.

[0091] The following will Figure 9 illustrate the working principle of the pixel circuit shown in detail. Among them, the driving transistor M0, the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, the seventh transistor M7, and the eighth transistor M8 may all be N-type transistors. Figure 10 is a driving timing diagram of another pixel circuit provided by an embodiment of the present invention, which is applicable to Figure 9 the pixel circuit shown in Figure 9 and Figure 10 , the working principle of the pixel circuit includes:

[0092] Initialization stage t1: The first scan signal Scan1 controls the third transistor M3 to conduct, the seventh scan signal Scan7 controls the fourth transistor M4 to conduct, and the rest of the transistors are all turned off. In this way, the first initialization signal VINIT initializes the first pole and the second pole of the coupling capacitor C simultaneously and respectively, that is, initializes the control end of the driving transistor M0. In addition, the initialization stage t1 may further include the second scan signal Scan2 controlling the first transistor M1 to conduct, so as to initialize the anode of the light emitting device D through the second initialization signal VREF.

[0093] Data writing and threshold compensation stage t2: The seventh scan signal Scan7 controls the fourth transistor M4 to conduct, the fourth scan signal Scan4 controls the fifth transistor M5 to conduct, and the fifth scan signal Scan5 controls the sixth transistor M6 to conduct, while the remaining transistors are all turned off. In this way, the voltage at the first pole of the coupling capacitor C is maintained at the first initialization signal VINIT; the data signal DATA is written into the control terminal of the driving transistor M0. The driving transistor M0 is equivalent to a diode through the fifth transistor M5 and is forward-biased. The fifth transistor M5 writes the threshold voltage VTH of the driving transistor M0 into the control terminal of the driving transistor M0. Thus, the voltage at the control terminal of the driving transistor M0 is DATA + VTH, that is, the voltage at the second pole of the coupling capacitor C is DATA + VTH; at the same time, the storage capacitor C2 stores the voltage at the control terminal of the driving transistor M0 to ensure stable light emission of the light-emitting device D during the light-emitting stage.

[0094] Resistance compensation stage t3: The second scan signal Scan2 controls the first transistor M1 to conduct (the first transistor M1 can be controlled to operate in a region near the linear region of the cut-off region), and the third scan signal Scan3 controls the second transistor M2 to conduct, while the remaining transistors are all turned off. In this way, the first transistor M1 and the contact resistance RX divide the voltage of the second initialization signal VREF. The second transistor M2 transmits the voltage Vx at point E, that is, the resistance compensation signal Vx, to the first pole of the coupling capacitor C. The voltage at the first pole of the coupling capacitor C changes from the previous first initialization signal VINIT to the resistance compensation signal Vx; furthermore, due to the coupling effect of the coupling capacitor C, the voltage at the second pole of the coupling capacitor C changes from the previous DATA + VTH to DATA + VTH + Vx - VINIT. It can be seen that when the contact resistance RX increases, the voltage at the control terminal of the driving transistor M0 increases, so the driving transistor M0 turns on more, the driving current output by the driving transistor M0 increases, and then the driving current flowing through the light-emitting device D increases, thereby avoiding the reduction of the driving current flowing through the light-emitting device D due to the presence or increase of the contact resistance RX, resulting in a smaller light-emitting brightness of the light-emitting device D.

[0095] Light-emitting stage t4: The sixth scan signal Scan6 controls the seventh transistor M7 and the eighth transistor M8 to conduct, while the remaining transistors are all turned off. In this way, the light-emitting device D emits light in response to the driving current.

[0096] The embodiment of the present invention also provides a display panel. The display panel includes a substrate and a pixel circuit as described in any of the above technical solutions. Among them, the substrate can be a glass substrate, and the pixel circuit is arranged on the glass substrate to form a driving backplane. The display panel provided by the embodiment of the present invention and the pixel circuit belong to the same inventive concept and can achieve the same technical effects. The repeated content will not be elaborated here.

[0097] An embodiment of the present invention further provides a driving method for a pixel circuit. The driving method for the pixel circuit is applicable to driving the pixel circuit of any of the above technical solutions. The driving method for the pixel circuit includes:

[0098] In the initialization stage, control the first initialization module to conduct, and initialize the control terminal of the driving module.

[0099] In the compensation stage, control the resistance compensation module to conduct. The resistance compensation module outputs a resistance compensation signal according to the contact resistance and the voltage division of the resistance compensation module. Among them, the resistance compensation signal is a voltage signal containing the value of the contact resistance. That is, in the compensation stage of the embodiment of the present invention, the resistance compensation module is controlled to conduct, so that the value of the contact resistance is converted into a voltage signal by the resistance compensation module and output from the resistance compensation module.

[0100] In the data writing stage, control the data writing module to conduct. The data writing module writes the data signal into the control terminal of the driving module, and the coupling module adjusts the voltage of the control terminal of the driving module according to its coupling effect, and controls the driving current generated by the driving module to change positively with the value of the contact resistance.

[0101] Among them, due to the coupling effect of the coupling module, when the data signal is written into the first end of the coupling module, the voltage change amount of the first end is the difference between the data signal and the resistance compensation signal. The second end of the coupling module also changes accordingly, and the change amount is the difference between the data signal and the resistance compensation signal. Thus, the voltage of the control terminal of the driving module is related to the resistance compensation signal, and being related to the resistance compensation signal means being related to the value of the contact resistance. That is, in the embodiment of the present invention, by setting the coupling module, the voltage signal containing the value of the contact resistance is compensated to the control terminal of the driving module.

[0102] On this basis, control the driving current generated by the driving module to change positively with the value of the contact resistance. For example, make the magnitude of the driving current generated by the driving module decrease as the value of the contact resistance decreases, so that the driving current flowing through the light-emitting device decreases as the value of the contact resistance decreases; make the magnitude of the driving current generated by the driving module increase as the value of the contact resistance increases, so that the driving current flowing through the light-emitting device increases as the value of the contact resistance increases. In this way, it is avoided that the driving current flowing through the light-emitting device decreases due to the existence or increase of the contact resistance, resulting in a small light-emitting brightness of the light-emitting device. The embodiment of the present invention thus realizes the compensation for the display unevenness of the display panel caused by the contact resistance, makes the display of the display panel uniform, and ensures the display effect of the display panel.

[0103] Optionally, in the compensation stage, the second scan signal controls the first compensation unit to conduct, and the resistance compensation module outputs a resistance compensation signal according to the contact resistance and the voltage division of the first compensation unit; wherein, the second scan signal controls the current flowing through the resistance compensation module to be less than the light emission threshold current of the light emitting device.

[0104] Optionally, in the initialization stage, it further includes: the second scan signal controls the first compensation unit to conduct, and the second initialization signal initializes the first pole of the light emitting device.

[0105] In addition, it should be noted that in the embodiments of the pixel circuit, specific driving methods are described for different pixel circuits, and these driving methods can all be considered as the driving methods of the pixel circuit provided by the embodiments of the present invention. The repeated content will not be elaborated here.

[0106] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A pixel circuit, characterized in that: include: A driving module for providing a driving current to the light-emitting device; wherein a first electrode of the light-emitting device is electrically connected to the driving module, a second electrode of the light-emitting device is connected to a first power signal, and there is a contact resistance between the light-emitting device and the first power signal; A first initialization module, configured to initialize the control end of the driving module during an initialization phase; A resistance compensation module, configured to output a resistance compensation signal during a compensation phase based on the contact resistance and the divided voltage of the resistance compensation module; the resistance compensation module comprising a first compensation unit and a second compensation unit; a first end of the first compensation unit being electrically connected to the first electrode of the light-emitting device, a second end of the first compensation unit being connected to a second initialization signal, and a control end of the first compensation unit being connected to a second scanning signal; a first end of the second compensation unit being electrically connected to the first electrode of the light-emitting device, and a control end of the second compensation unit being connected to a third scanning signal; A data writing module, used for writing a data signal into the control terminal of the driving module during a data writing phase; A coupling module, wherein a first end of the coupling module is connected to the resistance compensation signal, and a second end of the coupling module is electrically connected to the control end of the driving module; the coupling module is used to adjust the voltage of the control end of the driving module according to its coupling effect, and control the driving current generated by the driving module and the resistance value of the contact resistance to change in a positive direction; the coupling module is electrically connected between the second end of the second compensation unit and the control end of the driving module.

2. The pixel circuit according to claim 1, wherein: A first terminal of the first initialization module receives a first initialization signal, a second terminal of the first initialization module is electrically connected to a control terminal of the driving module, and the control terminal of the first initialization module receives a first scanning signal.

3. The pixel circuit according to claim 2, wherein: The coupling module includes a coupling capacitor; a first electrode of the coupling capacitor serves as a first end of the coupling module, and a second electrode of the coupling capacitor serves as a second end of the coupling module.

4. The pixel circuit according to claim 1, wherein: The first compensation unit includes a first transistor, and the second compensation unit includes a second transistor; the first end of the first transistor serves as the first end of the first compensation unit, the second end of the first transistor serves as the second end of the first compensation unit, and the control end of the first transistor serves as the control end of the first compensation unit; the first end of the second transistor serves as the first end of the second compensation unit, the second end of the second transistor serves as the second end of the second compensation unit, and the control end of the second transistor serves as the control end of the second compensation unit.

5. The pixel circuit according to claim 2, wherein: Also includes: A second initialization module, wherein a first end of the second initialization module receives the first initialization signal, a second end of the second initialization module is electrically connected to the first end of the coupling module, and a control end of the second initialization module receives the first scanning signal.

6. The pixel circuit according to claim 5, wherein: The first initialization module includes a third transistor; the first end of the third transistor serves as the first end of the first initialization module, the second end of the third transistor serves as the second end of the first initialization module, and the control end of the third transistor serves as the control end of the first initialization module.

7. The pixel circuit according to claim 6, wherein: The second initialization module includes a fourth transistor; the first end of the fourth transistor serves as the first end of the second initialization module, the second end of the fourth transistor serves as the second end of the second initialization module, and the control end of the fourth transistor serves as the control end of the second initialization module.

8. The pixel circuit according to claim 1, wherein: The first end of the driving module is connected to the second power signal; The pixel circuit further includes: a voltage compensation module, which is electrically connected between the control end of the driving module and the second end of the driving module, and is used to compensate the threshold voltage and / or power supply voltage of the control end of the driving module during the compensation stage.

9. The pixel circuit according to claim 8, wherein: The voltage compensation module includes a fifth transistor, a first end of the fifth transistor is electrically connected to the control end of the driving module, a second end of the fifth transistor is electrically connected to the second end of the driving module, and the control end of the fifth transistor is connected to a fourth scanning signal.

10. The pixel circuit according to claim 8, wherein: Also includes: Light-emitting control module; the light-emitting control module is used to control the light-emitting device to emit light in the light-emitting stage and to control the light-emitting device not to emit light in stages other than the light-emitting stage.

11. The pixel circuit according to any one of claims 2 to 10, wherein: The first end of the data writing module is electrically connected to the first end of the coupling module, the second end of the data writing module is connected to the data signal, and the control end of the data writing module is connected to the fifth scanning signal.

12. The pixel circuit according to claim 11, wherein: The data writing module includes a sixth transistor, the first end of the sixth transistor serves as the first end of the data writing module, the second end of the sixth transistor serves as the second end of the data writing module, and the control end of the sixth transistor serves as the control end of the data writing module.

13. The pixel circuit according to any one of claims 2 to 10, wherein: The second end of the driving module is electrically connected to the resistance compensation module; the first end of the data writing module is electrically connected to the first end of the driving module, the second end of the data writing module is connected to the data signal, and the control end of the data writing module is connected to the fifth scanning signal.

14. The pixel circuit according to claim 13, wherein: The data writing module includes a sixth transistor, the first end of the sixth transistor serves as the first end of the data writing module, the second end of the sixth transistor serves as the second end of the data writing module, and the control end of the sixth transistor serves as the control end of the data writing module.

15. A display panel, characterized in that: The method comprises the pixel circuit according to any one of claims 1 to 14.

16. A method for driving a pixel circuit, characterized in that: For driving the pixel circuit according to any one of claims 1 to 12, the method comprising: In the initialization stage, the first initialization module is controlled to be turned on to initialize the control end of the driving module; In the compensation stage, the resistance compensation module is controlled to be turned on, and the resistance compensation module outputs a resistance compensation signal according to the contact resistance and the divided voltage of the resistance compensation module; During the data writing phase, the data writing module is controlled to be turned on, and the data writing module writes the data signal into the control end of the driving module. The coupling module adjusts the voltage of the control end of the driving module according to its coupling effect, and controls the driving current generated by the driving module and the resistance value of the contact resistance to change in a positive direction.

17. The driving method of the pixel circuit according to claim 16, wherein: The resistance compensation module includes a first compensation unit, a first end of the first compensation unit is electrically connected to the first electrode of the light-emitting device, a second end of the first compensation unit is connected to a second initialization signal, and a control end of the first compensation unit is connected to a second scanning signal; During the compensation stage, the second scanning signal controls the first compensation unit to be turned on, and the resistance compensation module outputs a resistance compensation signal based on the contact resistance and the voltage division of the first compensation unit; wherein, the second scanning signal controls the current flowing through the resistance compensation module to be less than the light-emitting threshold current of the light-emitting device.

18. The driving method of the pixel circuit according to claim 17, wherein: In the initialization stage, the second scanning signal is further included to control the first compensation unit to be turned on, and the second initialization signal is used to initialize the first electrode of the light-emitting device.

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