Pixel circuit, control method thereof and display panel

Abstract

The present application provides a pixel circuit, a control method thereof and a display panel, relates to the technical field of display, and improves the characteristic drift phenomenon of a driving module. The pixel circuit comprises: a driving module, a first end of the driving module being connected with a first power supply signal line; a first storage module, a first plate of the first storage module being connected with a control end of the driving module; a first switch module, a first end of the first switch module being connected with the driving module, a control end of the first switch module being connected with a first scanning signal line, and a second end of the first switch module being connected with a first reference voltage signal line; and the first switch module is used for transmitting a first reference voltage signal in the first reference voltage signal line to the driving module at least in a non-emitting stage of a holding frame, so that the driving module is turned on, thereby releasing the stress of the driving module, and further improving the characteristic drift phenomenon of the driving module.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a pixel circuit and its control method, and a display panel. Background Technology

[0002] AMOLED (Active-matrix organic light-emitting diode) has become the mainstream technology in the display field due to its advantages such as wider viewing angle, higher refresh rate and thinner size, and is widely used in various display products such as mobile phones, TVs, and computers.

[0003] However, the driving modules in current AMOLED display products suffer from characteristic drift issues. Summary of the Invention

[0004] To address the aforementioned technical problems, this application is proposed. Embodiments of this application provide a pixel circuit, its control method, and a display panel.

[0005] In a first aspect, one embodiment of this application provides a pixel circuit, the pixel circuit comprising: a driving module, a first end of the driving module being connected to a first power signal line; a first storage module, a first electrode of the first storage module being connected to a control terminal of the driving module; a first switch module, a first end of the first switch module being connected to the driving module, a control terminal of the first switch module being connected to a first scan signal line, and a second end of the first switch module being connected to a first reference voltage signal line; the first switch module is at least used to transmit a first reference voltage signal in the first reference voltage signal line to the driving module during the non-light-emitting phase of the holding frame, so as to turn on the driving module.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, the first end of the first switch module is connected to the second end of the drive module; or the drive module includes a first control end and a second control end, the first plate of the first storage module is connected to the first control end of the drive module; and the first end of the first switch module is connected to the second control end of the drive module.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the driving module includes a first control terminal and a second control terminal, and the first electrode plate of the first storage module is connected to the first control terminal of the driving module; the pixel circuit further includes: a second storage module, the first electrode plate of the second storage module is connected to the first terminal of the first switch module, and the second electrode plate of the second storage module is connected to the second control terminal or the second terminal of the driving module.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the pixel circuit further includes: a second switch module, the first end of the second switch module being connected to the control terminal of the drive module, the second end of the second switch module being connected to the second terminal of the drive module, and the control terminal of the second switch module being connected to the second scan signal line.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the second switch module includes a first switch submodule and a second switch submodule. The first end of the first switch submodule is connected to the second end of the drive module, the first end of the second switch submodule is connected to the control end of the drive module, the second end of the first switch submodule is connected to the second end of the second switch submodule, the control end of the first switch submodule is connected to the control end of the second switch submodule and the second scan signal line.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the driving module is connected between the first power signal line and the first electrode of the light-emitting diode, and the pixel circuit further includes: a third switch module, the control terminal and the first terminal of the third switch module are both connected to the first scan signal line, and the second terminal of the third switch module is connected to the first electrode of the light-emitting diode.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the pixel circuit further includes: a fourth switch module, the first end of the fourth switch module being connected to a data voltage signal line, the second end of the fourth switch module being connected to the second electrode plate of the first storage module, and the control end of the fourth switch module being connected to a second scan signal line.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the pixel circuit further includes: a fifth switch module, the first end of the fifth switch module being connected to the first electrode plate of the first storage module, the second end of the fifth switch module being connected to the second reference voltage signal line, and the control end of the fifth switch module being connected to the third scan signal line;

[0013] Preferably, the pixel circuit further includes: a sixth switch module and a seventh switch module, wherein the first end of the sixth switch module is connected to the second electrode plate of the first storage module, the second end of the sixth switch module is connected to the second reference voltage signal line, and the control end of the sixth switch module is connected to the light emission control signal line; the first end of the seventh switch module is connected to the second end of the driving module, the second end of the seventh switch module is connected to the first electrode of the light-emitting diode, and the control end of the seventh switch module is connected to the light emission control signal line.

[0014] Secondly, one embodiment of this application provides a control method for a pixel circuit. The control method is applied to the pixel circuit mentioned in any of the above embodiments. The control method includes: causing a first switching module to transmit a first reference voltage signal in a first reference voltage signal line to a driving module at least during the non-light-emitting phase of a holding frame, so as to turn on the driving module.

[0015] Thirdly, one embodiment of this application provides a display panel that includes pixel circuitry as mentioned in any of the above embodiments.

[0016] The pixel circuit provided in this application embodiment includes: a driving module, the first end of which is connected to a first power signal line; a first storage module, the first electrode of which is connected to a control terminal of the driving module; and a first switch module, the first end of which is connected to the driving module, the control terminal of which is connected to a first scan signal line, and the second end of which is connected to a first reference voltage signal line. The first switch module is at least used to transmit the first reference voltage signal in the first reference voltage signal line to the driving module during the non-light-emitting phase of the holding frame, so as to turn on the driving module, thereby relieving the stress of the driving module and improving the characteristic drift phenomenon of the driving module. Attached Figure Description

[0017] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 The diagram shown is a schematic diagram of a pixel circuit provided in an embodiment of this application.

[0019] Figure 2 The figure shown is a timing diagram provided in an embodiment of this application.

[0020] Figure 3 The diagram shown is a schematic diagram of a pixel circuit provided in another embodiment of this application.

[0021] Figure 4 The diagram shown is a schematic diagram of a pixel circuit provided in another embodiment of this application.

[0022] Figure 5 The diagram shown is a comparison of the threshold voltage compensation before and after the threshold voltage compensation of the driving module provided in an embodiment of this application.

[0023] Figure 6 The diagram shown is a comparison of the trace voltage of the first power signal line before and after compensation, according to an embodiment of this application.

[0024] Figure 7 The diagram shown is a comparison of the flickering phenomenon before and after improvement according to an embodiment of this application.

[0025] Figure 8The diagram shown is a flowchart illustrating a pixel circuit control method provided in an embodiment of this application.

[0026] Figure 9 The diagram shown is a structural schematic of a display panel provided in an embodiment of this application.

[0027] Reference numerals: Drive module T; First switch module T1; Second switch module T2; First switch sub-module T2-1; Second switch sub-module T2-2; Third switch module T3; Fourth switch module T4; Fifth switch module T5; Sixth switch module T6; Seventh switch module T7; First scan signal line S1; Second scan signal line S2; Third scan signal line S3; Light emission control signal line EM; First power supply voltage ELVDD; Second power supply voltage ELVSS; Data voltage Data; First reference voltage Vref1; Second reference voltage Vref2; Light emission diode OLED; First storage module C1; Second storage module C2; ​​First electrode plate A1 of the first storage module; Second electrode plate A2 of the first storage module; First electrode plate A3 of the second storage module; Second electrode plate A4 of the second storage module; Initialization stage t1; Compensation stage t2; Light emission stage t3; Display panel 100. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods and means well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] Figure 1 The diagram shown is a schematic diagram of a pixel circuit provided in an embodiment of this application. Figure 1 The diagram shows an 8T1C pixel circuit. (Example) Figure 1As shown, the pixel circuit provided in this embodiment includes: a driving module T, with a first end connected to a first power signal line; a first storage module C1, with a first electrode A1 connected to the control terminal of the driving module T; and a first switch module T1, with a first end connected to the driving module T, a control terminal connected to a first scan signal line S1, and a second end connected to a first reference voltage signal line. The first switch module T1 is at least used to transmit a first reference voltage signal from the first reference voltage signal line to the driving module T during the non-light-emitting phase of the holding frame, so that the driving module T is turned on. Wherein, as... Figure 2 As shown, the non-light-emitting phase of the holding frame refers to the interval in which the level provided by the light-emitting control signal line EM is at the cutoff level (high level).

[0033] In this embodiment, the first reference voltage signal in the first reference voltage signal line applies a first reference voltage Vref1 to the drive module T. By presetting the value of the first reference voltage Vref1, the difference between the control terminal voltage of the drive module T and the first terminal voltage or the second terminal voltage of the drive module T satisfies the conduction condition of the drive module T, thereby turning on the drive module T, releasing the stress of the drive module T, and thus improving the characteristic drift phenomenon of the drive module T.

[0034] In this embodiment, the driving module T and the first switching module T1 can be P-type transistors. For a P-type transistor, the on-level is low and the off-level is high. That is, when the control terminal of the P-type transistor is low, its first and second terminals are connected; when the control terminal of the P-type transistor is high, its first and second terminals are turned off.

[0035] In specific implementation, the gate of each transistor is used as its control terminal. Furthermore, depending on the signal and type of the gate of each transistor, its first terminal can be used as the source and its second terminal as the drain, or its first terminal can be used as the drain and its second terminal as the source. No distinction is made here. In addition, the on-level and off-level in the embodiments of this application are general terms. The on-level refers to any level that can turn on the transistor, and the off-level refers to any level that can turn off / turn off the transistor.

[0036] In the embodiments of this application, the term "connection" can refer to a direct connection between two components, or a connection between two components via one or more other components. The first power supply voltage corresponding to the first power supply signal in the first power supply signal line is represented by ELVDD.

[0037] Figure 2 The diagram shown is a timing illustration provided in an embodiment of this application. The following is in conjunction with... Figure 2 The timing pairs shown Figure 1The pixel circuit shown will be introduced. Figure 1 The working process of the pixel circuit can specifically include: initialization stage t1, compensation stage t2, and light emission stage t3.

[0038] During the initialization phase t1, the first scan signal line S1 provides a conduction level, and the light emission control signal line EM provides a cutoff level. The first switch module T1 is turned on under the control of the first scan signal line S1, thereby transmitting the first reference voltage signal provided by the first reference voltage signal line to the drive module T via the turned-on first switch module T1. This applies a first reference voltage Vref1 to the drive module T, causing the drive module T to turn on and thus relieving the stress on the drive module T.

[0039] like Figure 1 As shown, in one embodiment of this application, the first end of the first switch module T1 is connected to the second end of the drive module T; or the drive module T includes a first control terminal and a second control terminal, and the first electrode plate A1 of the first storage module C1 is connected to the first control terminal of the drive module T; the first end of the first switch module T1 is connected to the second control terminal of the drive module T. The drive module T may include a top gate and a bottom gate, the first control terminal may be the top gate, and the second control terminal may be the bottom gate. By connecting the first end of the first switch module T1 to the second end or the second control terminal of the drive module T, and by pre-setting the value of the first reference voltage Vref1, the difference between the control terminal voltage of the drive module T and the first or second terminal voltage of the drive module T can satisfy the conduction condition of the drive module T. This embodiment provides a simpler connection method between the first switch module T1 and the drive module T, thereby achieving the purpose of transmitting the first reference voltage signal provided by the first reference voltage signal line to the second end of the drive module T via the conducting first switch module T1, thus turning on the drive module T. This embodiment has a simple manufacturing process, is easy to implement, and has low cost.

[0040] Figure 3 The diagram shown is a schematic diagram of a pixel circuit provided in another embodiment of this application. Figure 3As shown, in the pixel circuit provided in this embodiment, the driving module T includes a first control terminal and a second control terminal. The first electrode A1 of the first storage module C1 is connected to the first control terminal of the driving module T. The pixel circuit also includes a second storage module C2. The first electrode A3 of the second storage module is connected to the first terminal of the first switch module T1, and the second electrode A4 of the second storage module C2 is connected to the second control terminal or the second terminal of the driving module T. By connecting the second electrode A4 of the second storage module C2 to the second control terminal or the second terminal of the driving module T, the voltage of the second control terminal or the second terminal of the driving module T can be adjusted through the coupling effect of the second storage module C2, so that the difference between the voltage of the control terminal of the driving module T and the voltage of the first terminal or the second terminal of the driving module T satisfies the conduction condition of the driving module T.

[0041] It should be noted that, Figure 3 The pixel circuit shown is also in Figure 2 The timing diagram provided is used in this application.

[0042] This application provides an alternative connection method between the first switch module T1 and the drive module T. In this embodiment, the first reference voltage signal provided by the first reference voltage signal line is transmitted to the channel region of the drive module T via the conducting first switch module T1 and the second storage module C2, thereby reducing the voltage difference between the channel region of the drive module T and the control terminal of the drive module T, thus reducing the stress intensity of the drive module T and improving the characteristic drift phenomenon of the drive module T.

[0043] like Figure 1 and 3 As shown, in the pixel circuit provided in the embodiment of this application, the pixel circuit further includes: a second switch module T2, the first end of the second switch module T2 is connected to the control end of the drive module T, the second end of the second switch module T2 is connected to the second end of the drive module T, and the control end of the second switch module T2 is connected to the second scan signal line S2.

[0044] During the compensation phase t2, the second scan signal line S2 provides a conduction level. The second switch module T2 is turned on under the control of the second scan signal line S2, thereby connecting the control terminal of the drive module T to its second terminal. Then, the threshold voltage Vth(T) of the drive module T is compensated by the first power supply voltage ELVDD in the first power supply signal line. At this time, the control terminal voltage Vg1 of the drive module T = ELVDD + Vth(T). This setting reduces the impact of the trace voltage drop of the first power supply signal line, providing the necessary conditions for the consistency of the light emission brightness.

[0045] Figure 4 The diagram shown is a schematic diagram of a pixel circuit provided in another embodiment of this application. Figure 4As shown, in the pixel circuit provided in this application embodiment, the second switch module T2 includes a first switch submodule T2-1 and a second switch submodule T2-2. The first end of the first switch submodule T2-1 is connected to the second end of the driving module T, the first end of the second switch submodule T2-2 is connected to the control end of the driving module T, the second end of the first switch submodule T2-1 is connected to the second end of the second switch submodule T2-2, and the control end of the first switch submodule T2-1 is connected to the control end of the second switch submodule T2-2 and the second scan signal line S2.

[0046] It should be noted that, Figure 4 The pixel circuit shown is also in Figure 2 The timing diagram provided is used in this application.

[0047] In this embodiment, the first switch submodule T2-1 and the second switch submodule T2-2 can be referred to as a "dual-gate structure". The characteristic of the dual-gate structure is that the control terminal (i.e., the gate) of the first switch submodule T2-1 is connected to the control terminal (i.e., the gate) of the second switch submodule T2-2. In other embodiments, a circuit structure where the gates of the two modules are not connected is called a "single-gate structure". Compared to a "single-gate structure", the leakage current of a dual-gate structure is smaller than that of a single-gate structure.

[0048] In this embodiment, because the control terminal of the driving module T is a sensitive node, the leakage current of this node needs to be minimized. Therefore, the second switch module T2 connected to the control terminal of the driving module T is configured as a "dual-gate structure". Specifically, the second switch module T2 includes a first switch submodule T2-1 and a second switch submodule T2-2. The control terminal of the first switch submodule T2-1 is connected to the control terminal of the second switch submodule T2-2, thereby reducing the leakage current of the pixel circuit and improving the stability of the pixel circuit.

[0049] like Figure 1 , 3 As shown in Figure 4, in the pixel circuit provided in this embodiment, the driving module T is connected between the first power signal line and the first electrode of the light-emitting diode (OLED). The pixel circuit further includes a third switch module T3, the control terminal and the first terminal of the third switch module T3 are both connected to the first scan signal line S1, and the second terminal of the third switch module T3 is connected to the first electrode of the light-emitting diode (OLED). The first electrode of the light-emitting diode (OLED) can be the anode.

[0050] During the initialization phase t1, the third switching module T3 is turned on under the control of the first scan signal line S1, thereby resetting the anode voltage of the light-emitting diode OLED to Vgl-Vth(T3). Here, Vgl is the voltage of other circuits (such as the GIP circuit) connected to the pixel circuit, and Vth(T3) is the threshold voltage of the third switching module T3.

[0051] In some embodiments, the cathode of the light-emitting diode (OLED) is connected to a second power supply signal line, and therefore the cathode voltage of the OLED is the second power supply voltage ELVSS provided by the second power supply signal line.

[0052] like Figure 1 , 3 As shown in Figure 4, in the pixel circuit provided in the embodiment of this application, the pixel circuit further includes: a fourth switch module T4, the first end of the fourth switch module T4 is connected to the data voltage signal line, the second end of the fourth switch module T4 is connected to the second electrode plate A2 of the first storage module, and the control end of the fourth switch module T4 is connected to the second scan signal line S2.

[0053] During the initialization phase t1 and the compensation phase t2, the second scan signal line S2 provides a conduction level. The fourth switch module T4 is turned on under the control of the second scan signal line S2, thereby transmitting the data voltage signal in the data voltage signal line to the second plate A2 of the first storage module via the turned-on fourth switch module T4, thus making the voltage of the second plate A2 of the first storage module the data voltage Data.

[0054] like Figure 1 , 3 As shown in Figure 4, preferably, the pixel circuit further includes: a fifth switch module T5, the first end of the fifth switch module T5 is connected to the first electrode plate A1 of the first storage module, the second end of the fifth switch module T5 is connected to the second reference voltage signal line, and the control end of the fifth switch module T5 is connected to the third scan signal line S3.

[0055] Specifically, during the initialization phase t1, the third scan signal line S3 provides a conduction level. The fifth switch module T5 is turned on under the control of the third scan signal line S3, thereby transmitting the second reference voltage signal in the second reference voltage signal line to the first plate A1 of the first storage module via the turned-on fifth switch module T5, thus resetting the voltage of the first plate A1 of the first storage module to the second reference voltage Vref2.

[0056] like Figure 1 , 3As shown in Figure 4, preferably, the pixel circuit further includes: a sixth switch module T6 and a seventh switch module T7, wherein the first end of the sixth switch module T6 is connected to the second electrode plate A2 of the first storage module, the second end of the sixth switch module T6 is connected to the second reference voltage signal line, and the control end of the sixth switch module T6 is connected to the light emission control signal line EM; the first end of the seventh switch module T7 is connected to the second end of the driving module T, the second end of the seventh switch module T7 is connected to the first electrode of the light-emitting diode OLED, and the control end of the seventh switch module T7 is connected to the light emission control signal line EM.

[0057] During the light-emitting stage t3, the light-emitting control signal line EM provides a conduction level. The sixth switch module T6 is turned on under the control of the light-emitting control signal line EM, thereby transmitting the second reference voltage signal in the second reference voltage signal line to the second electrode A2 of the first storage module via the turned-on sixth switch module T6. The voltage of the second electrode A2 of the first storage module is the second reference voltage Vref2. Additionally, the seventh switch module T7 is turned on under the control of the light-emitting control signal line EM, thereby causing the light-emitting diode (OLED) to emit light.

[0058] In the pixel circuit provided in this embodiment, during the light-emitting stage t3, the control terminal voltage of the driving module T is Vg2 = Vg1 + Vref2 - Data = ELVDD + Vth(T) + Vref2 - Data. Furthermore, Vgs = Vg2 - Vs = Vg2 - ELVDD, therefore Vgs - Vth(T) = Vref2 - Data. Since Vgs - Vth(T) determines the luminous brightness of the OLED, and since Vgs - Vth(T) is a function of Vref2 - Data and does not contain ELVDD or Vth(T), the luminous brightness of the OLED is not affected by the first power supply voltage ELVDD and the threshold voltage Vth(T) of the driving module T. Therefore, the brightness will not fluctuate due to changes in the trace voltage drop of the first power supply voltage ELVDD and the threshold voltage Vth(T) of the driving module T, thus ensuring the consistency of the OLED's luminous brightness.

[0059] It should be noted that Vgs represents the difference between the control terminal (gate) voltage and the first terminal (source) voltage of the drive module T, where Vs is the voltage of the first terminal (source) of the drive module T, Vs = ELVDD.

[0060] Figure 5 The diagram shown is a comparison of the threshold voltage compensation before and after the implementation of a driving module according to an embodiment of this application. Figure 5As shown, curve Q1 is the threshold voltage curve of the drive module T provided in this application, that is, the threshold voltage curve of the drive module T after compensation; curve Q2 is the threshold voltage curve of the drive module T provided in related technologies, that is, the threshold voltage curve of the drive module T before compensation. Figure 5 It is evident that the threshold voltage fluctuation of the driving module T provided in this application is far less than that of the driving module T provided in related technologies. Therefore, the pixel circuit provided in this application improves the stability of the threshold voltage of the driving module T.

[0061] Figure 6 The diagram shown is a comparison of the trace voltage of the first power signal line before and after compensation, according to an embodiment of this application. Figure 6 As shown, curve Q3 is the curve of the trace voltage of the first power signal line provided in this application, that is, the curve of the trace voltage of the first power signal line after compensation; curve Q4 is the curve of the trace voltage of the first power signal line provided in related technologies, that is, the curve of the trace voltage of the first power signal line before compensation. Figure 6 It is evident that the voltage fluctuation of the first power signal line provided in this application is far less than that of the first power signal line provided in related technologies. Therefore, the pixel circuit provided in this application improves the stability of the voltage fluctuation of the first power signal line.

[0062] Figure 7 The diagram shown is a comparison of the flickering phenomenon before and after improvement according to an embodiment of this application. Figure 7 As shown, curve Q5 represents the luminous intensity curve provided in this application; curve Q6 represents the luminous intensity curve provided in related technologies. Figure 7 It is evident that the fluctuation in the luminous intensity of the LED OLED in this application is far less than that in related technologies. Therefore, the pixel circuit provided in this application improves the consistency of the luminous intensity of the LED OLED.

[0063] The circuit structure of the pixel circuit provided in this application has been described in detail above. The corresponding control method for this pixel circuit is described below. It is understood that this control method corresponds to the circuit structure of the pixel circuit; therefore, the circuit structure mentioned in this control method can be referenced from the above-described pixel circuit content, and will not be repeated here.

[0064] In some embodiments, the control method includes: causing the first switching module T1 to transmit the first reference voltage signal in the first reference voltage signal line to the driving module T at least during the non-light-emitting phase of the holding frame, so as to turn on the driving module T, thereby relieving the stress of the driving module T and improving the characteristic drift phenomenon of the driving module T.

[0065] Figure 8 The diagram shown is a schematic flowchart of a pixel circuit control method provided in an embodiment of this application. (In conjunction with...) Figures 1 to 4 as well as Figure 8 As shown, this control method is applied to a pixel circuit as mentioned in any of the above embodiments, and the control method includes:

[0066] In step S801, during the initialization phase t1, the first switch module T1 is turned on by controlling the first scan signal line S1 so that the first reference voltage signal in the first reference voltage signal line is transmitted to the drive module T through the first switch module T1; and during the initialization phase t1, the first plate A1 of the first storage module is reset.

[0067] The control method further includes: step S802, in the compensation stage t2, controlling the second switch module T2 to be turned on through the second scan signal line S2, so as to compensate the threshold voltage of the drive module T through the first power signal in the first power signal line; and controlling the fourth switch module T4 to be turned on through the second scan signal line S2, so that the data voltage signal in the data voltage signal line is transmitted to the second plate A2 of the first storage module through the fourth switch module T4.

[0068] In step S803, during the light emission stage t3, the sixth switch module T6 is turned on by the light emission control signal line EM, so that the second reference voltage signal in the second reference voltage signal line is transmitted to the second electrode plate A2 of the first storage module through the sixth switch module T6; and the seventh switch module T7 is turned on by the light emission control signal line EM, so that the light-emitting diode OLED emits light.

[0069] The pixel circuit control method provided in this application applies a first reference voltage Vref1 to the driving module T through the first reference voltage signal in the first reference voltage signal line, thereby turning on the driving module T, releasing the stress of the driving module T, and thus improving the characteristic drift phenomenon of the driving module T.

[0070] Figure 9 The diagram shown is a structural schematic of a display panel provided in one embodiment of this application. Figure 9 As shown, one embodiment of this application also provides a display panel 100, which includes pixel circuits as mentioned in any of the above embodiments. It is understood that the display panel 100 can be applied to a display device, which may be, for example, any product or component with display functionality such as a mobile terminal, tablet computer, computer monitor, television, wearable device, or information kiosks.

[0071] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0072] It should also be noted that in this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalent solutions to this application. Although several exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A pixel circuit, characterized in that, The pixel circuit includes an initialization stage, a compensation stage, and a light emission stage arranged sequentially, including: The driver module has its first end connected to the first power signal line; A first storage module, wherein the first electrode plate of the first storage module is connected to the control terminal of the drive module; A first switching module has a first terminal connected to the driving module, a control terminal connected to a first scan signal line, and a second terminal connected to a first reference voltage signal line. The first switching module is at least configured to transmit a first reference voltage signal from the first reference voltage signal line to the driving module during the non-light-emitting phase of a holding frame, thereby turning on the driving module. The first switching module is also configured to transmit the first reference voltage signal from the first reference voltage signal line to the driving module during the initialization phase of a writing frame. A second switch module has a first terminal connected to the control terminal of the drive module, a second terminal connected to the second terminal of the drive module, and the control terminal connected to a second scan signal line. The second switch module is used to turn on at least during the compensation phase of the hold frame, connecting the control terminal and the second terminal of the drive module, thereby compensating the threshold voltage of the drive module with the first power supply voltage in the first power supply signal line, making the control terminal voltage of the drive module Vg1 = ELVDD + Vth(T), where ELVDD is the first power supply voltage and Vth(T) is the threshold voltage of the drive module. The fifth switch module has a first end connected to the first plate of the first storage module, a second end connected to the second reference voltage signal line, and a control end connected to the third scan signal line. The fifth switch module is used to transmit the second reference voltage signal in the second reference voltage signal line to the first plate of the first storage module during the initialization phase of the write frame.

2. The pixel circuit according to claim 1, characterized in that, The first terminal of the first switch module is connected to the second terminal of the drive module; or The drive module includes a first control terminal and a second control terminal. The first plate of the first storage module is connected to the first control terminal of the drive module. The first terminal of the first switch module is connected to the second control terminal of the drive module.

3. The pixel circuit according to claim 1, characterized in that, The driving module includes a first control terminal and a second control terminal, and the first electrode plate of the first storage module is connected to the first control terminal of the driving module; it also includes: The second storage module has its first electrode plate connected to the first terminal of the first switch module, and its second electrode plate connected to the second control terminal or the second terminal of the drive module.

4. The pixel circuit according to claim 1, characterized in that, The second switch module includes a first switch submodule and a second switch submodule. The first end of the first switch submodule is connected to the second end of the drive module. The first end of the second switch submodule is connected to the control end of the drive module. The second end of the first switch submodule is connected to the second end of the second switch submodule. The control end of the first switch submodule is connected to the control end of the second switch submodule and the second scan signal line.

5. The pixel circuit according to any one of claims 1 to 4, characterized in that, The driving module is connected between the first power signal line and the first electrode of the light-emitting diode, and also includes a third switch module, wherein the control terminal and the first terminal of the third switch module are both connected to the first scan signal line, and the second terminal of the third switch module is connected to the first electrode of the light-emitting diode.

6. The pixel circuit according to any one of claims 1 to 4, characterized in that, Also includes: The fourth switch module has a first terminal connected to a data voltage signal line, a second terminal connected to the second plate of the first storage module, and a control terminal connected to a second scan signal line.

7. The pixel circuit according to claim 1, characterized in that, The pixel circuit further includes a sixth switch module and a seventh switch module, wherein the first end of the sixth switch module is connected to the second electrode of the first storage module, the second end of the sixth switch module is connected to the second reference voltage signal line, and the control end of the sixth switch module is connected to the light emission control signal line; the first end of the seventh switch module is connected to the second end of the driving module, the second end of the seventh switch module is connected to the first electrode of the light-emitting diode, and the control end of the seventh switch module is connected to the light emission control signal line.

8. A method for controlling a pixel circuit, characterized in that, Applied to a pixel circuit as described in any one of claims 1 to 7, comprising: The first switching module transmits the first reference voltage signal in the first reference voltage signal line to the driving module at least during the non-light-emitting phase of the holding frame, so as to turn on the driving module.

9. A display panel, characterized in that, Includes the pixel circuit as described in any one of claims 1 to 7 above.

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