Pixel compensation circuit and driving method thereof, display panel

Abstract

The present disclosure provides a pixel compensation circuit and a driving method thereof, and a display panel. The pixel driving circuit comprises a driving module, a voltage writing module, a coupling module and a threshold compensation module. The threshold compensation module is configured to compensate the threshold voltage of the driving module in a threshold compensation stage. The first end of the coupling module is connected with the voltage writing module, and the second end of the coupling module is connected with the control end of the driving module. The voltage writing module is configured to output a fixed voltage to the first end of the coupling module in an initialization stage, and output a data voltage to the first end of the coupling module in a data writing stage. The coupling module is configured to couple the voltage containing the data voltage information to the control end of the driving module in the data writing stage. The start time of the data writing stage is later than the end time of the threshold compensation stage. The present disclosure separates the data writing and compensation, and the compensation time is not limited by the data writing time, so that high-frequency driving can be realized, and the display uniformity is improved.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a pixel compensation circuit and its driving method, and a display panel. Background Technology

[0002] Currently, AMOLED (Active-matrix organic light emitting diode) screens are becoming the mainstream for small and medium-sized smart devices such as mobile phones. With the increasing demand for mobile games, the need for higher refresh rates on AMOLED screens is also growing. Summary of the Invention

[0003] In view of this, the purpose of this disclosure is to propose a pixel compensation circuit that can achieve high-frequency driving and improve display uniformity.

[0004] To achieve the above objectives, this disclosure provides a pixel compensation circuit, which includes:

[0005] The module consists of a driver module, a voltage writing module, a coupling module, and a threshold compensation module.

[0006] The threshold compensation module is connected to the driving module, and the threshold compensation module is used to compensate the threshold voltage of the driving module during the threshold compensation stage.

[0007] The first end of the coupling module is connected to the voltage writing module, and the second end of the coupling module is connected to the control end of the driving module. The voltage writing module is used to output a fixed voltage to the first end of the coupling module during the initialization phase and to output a data voltage to the first end of the coupling module during the data writing phase. The coupling module is used to couple a voltage containing the data voltage information to the control end of the driving module during the data writing phase.

[0008] The start time of the data writing phase is later than the end time of the threshold compensation phase.

[0009] In one embodiment, it further includes:

[0010] It also includes a storage module, the threshold compensation module includes a first threshold compensation module and a second threshold compensation module, and the threshold compensation stage includes a first threshold compensation stage and a second threshold compensation stage;

[0011] The storage module is connected between the control terminal of the drive module and the first terminal of the drive module, the first threshold compensation module is connected between the control terminal of the drive module and the second terminal of the drive module, and the second threshold compensation module is connected to the first terminal of the drive module.

[0012] The first threshold compensation module is used to write the threshold voltage of the driving module to the first terminal of the driving module during the first threshold compensation stage;

[0013] The second threshold compensation module is used to couple the threshold voltage of the driving module located at the first end of the driving module to the control terminal of the driving module through the storage module during the second threshold compensation stage.

[0014] In one embodiment,

[0015] The voltage writing module includes a fixed voltage writing unit and a data voltage writing unit;

[0016] Both the fixed voltage writing unit and the data voltage writing unit are connected to the first end of the coupling module;

[0017] The fixed voltage writing unit is used to output a fixed voltage to the first terminal of the coupling module during the initialization phase;

[0018] The data voltage writing unit is used to output data voltage to the first end of the coupling module during the data writing phase.

[0019] In one embodiment, it further includes:

[0020] A leakage protection module is connected between the second end of the coupling module and the control end of the drive module.

[0021] In one embodiment, it further includes:

[0022] It also includes a first reset module, which is connected to the second end of the coupling module, and is used to reset the control terminal of the drive module.

[0023] In one embodiment, it further includes:

[0024] An adjustment module is connected to the first end of the drive module, and the adjustment module is used to adjust the characteristics of the drive module.

[0025] In one embodiment, it further includes:

[0026] A light-emitting module, wherein the anode of the light-emitting module is connected to the second end of the driving module, and the light-emitting module is used to emit light during the light-emitting phase;

[0027] Preferably, it further includes a second reset module, which is connected to the anode of the light-emitting module and is used to reset the anode of the light-emitting module;

[0028] Preferably, it further includes:

[0029] A first light-emitting control module is connected to a first end of the driving module.

[0030] The first light-emitting control module is turned on during the initialization and light-emitting phases, and turned off during the data writing phase.

[0031] Preferably, it further includes:

[0032] The second light-emitting control module has a first end connected to the second end of the driving module, and the second end of the light-emitting control module is connected to the anode of the light-emitting module.

[0033] Based on the same inventive concept, this disclosure also discloses a driving method for a pixel compensation circuit, applied to the aforementioned pixel compensation circuit.

[0034] The pixel compensation circuit includes a driving module, a voltage writing module, a coupling module, and a threshold compensation module; the driving method of the pixel compensation circuit includes:

[0035] During the initialization phase, the voltage writing module outputs a fixed voltage to the first terminal of the coupling module;

[0036] During the threshold compensation phase, the threshold compensation module compensates the threshold voltage of the driving module;

[0037] During the data writing phase, the voltage writing module outputs a data voltage to the first terminal of the coupling module, and couples the voltage containing the data voltage information to the control terminal of the drive module through the coupling module.

[0038] In one embodiment, the pixel compensation circuit further includes a storage module, the threshold compensation module includes a first threshold compensation module and a second threshold compensation module, and the threshold compensation stage includes a first threshold compensation stage and a second threshold compensation stage;

[0039] The threshold compensation module compensates the threshold voltage of the driving module, including:

[0040] During the first threshold compensation stage, the first threshold compensation module writes the threshold voltage of the driving module to the first terminal of the driving module;

[0041] During the second threshold compensation stage, the second threshold compensation module couples the threshold voltage of the driving module located at the first end of the driving module to the control terminal of the driving module through the storage module.

[0042] Preferably, the voltage writing module includes a fixed voltage writing unit and a data voltage writing unit;

[0043] The voltage writing module outputs a fixed voltage to the first terminal of the coupling module, including:

[0044] The fixed voltage writing unit outputs a fixed voltage to the first terminal of the coupling module;

[0045] The voltage writing module outputs a data voltage to the first terminal of the coupling module, including:

[0046] The data voltage writing unit outputs a data voltage to the first end of the coupling module.

[0047] Based on the same inventive concept, this disclosure also discloses a display panel that includes the pixel compensation circuit described above.

[0048] Compared with the prior art, the pixel compensation circuit provided in this disclosure separates data writing and compensation, so the compensation time is not limited by the data writing time, which can realize high-frequency driving and improve display uniformity. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in this disclosure or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of an existing 7T1C pixel compensation circuit.

[0051] Figure 2 This is a schematic diagram of the pixel compensation circuit in one embodiment of the present disclosure;

[0052] Figure 3 This is a flowchart of a driving method for a pixel compensation circuit in another embodiment of this disclosure;

[0053] Figure 4 This is a schematic diagram of the pixel compensation circuit in another embodiment of the present disclosure;

[0054] Figure 5 This is a flowchart of a driving method for a pixel compensation circuit in another embodiment of this disclosure;

[0055] Figure 6 This is a flowchart of a driving method for a pixel compensation circuit in another embodiment of this disclosure;

[0056] Figure 7This is a schematic diagram of the pixel compensation circuit in another embodiment of the present disclosure;

[0057] Figure 8 This is a signal timing diagram corresponding to the pixel compensation circuit in another embodiment of this disclosure;

[0058] Figure 9 This is a schematic diagram of the pixel compensation circuit in another embodiment of the present disclosure;

[0059] Figure 10 This is a schematic diagram of the pixel compensation circuit in another embodiment of the present disclosure;

[0060] Figure 11 This is a signal timing diagram corresponding to the pixel compensation circuit in another embodiment of this disclosure. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0062] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0063] AMOLED displays emit light through current-driven illumination. Therefore, the characteristics of the TFT (Thin Film Transistor) devices directly affect the grayscale brightness differences of the display. When the characteristics of the TFT devices in different sub-pixels differ too much, it can easily lead to uneven image quality, resulting in mura (display inhomogeneity). To address this issue, in existing display devices, refer to... Figure 1As shown, a conventional 7T1C pixel compensation circuit improves the brightness uniformity of the entire display screen by internally compensating the threshold voltage Vth of the pixel circuit. The data voltage signal Vdata is written and compensated simultaneously, which leads to insufficient compensation in high-frequency displays during data voltage writing and compensation, thus affecting the brightness uniformity of the entire display screen.

[0064] To address this issue, one embodiment of this disclosure provides a pixel compensation circuit that improves upon the problem of insufficient compensation in existing pixel compensation circuits during high-frequency displays.

[0065] Reference Figure 2 As shown, one embodiment of this disclosure provides a pixel compensation circuit, which includes: a driving module, a voltage writing module, a coupling module, and a threshold compensation module;

[0066] The threshold compensation module is connected to the drive module and is used to compensate the threshold voltage of the drive module during the threshold compensation stage.

[0067] The first end of the coupling module is connected to the voltage writing module, and the second end of the coupling module is connected to the control end of the drive module. The voltage writing module is used to output a fixed voltage to the first end of the coupling module during the initialization phase and to output a data voltage to the first end of the coupling module during the data writing phase. The coupling module is used to couple the voltage containing the data voltage information to the control end of the drive module during the data writing phase.

[0068] The start time of the data writing phase is later than the end time of the threshold compensation phase.

[0069] The pixel compensation circuit in this embodiment separates data writing and compensation, so the compensation time is not limited by the data writing time, which can realize high-frequency driving and improve display uniformity.

[0070] Reference Figure 3 As shown, another embodiment of this disclosure discloses a driving method for a pixel compensation circuit, applied to the pixel compensation circuit in the above embodiment, including the following steps:

[0071] Step S10: During the initialization phase, the voltage writing module outputs a fixed voltage to the first terminal of the coupling module;

[0072] Step S20: In the threshold compensation stage, the threshold compensation module compensates the threshold voltage of the drive module.

[0073] Step S30: During the data writing stage, the voltage writing module outputs a data voltage to the first end of the coupling module, and couples the voltage containing the data voltage information to the control end of the drive module through the coupling module.

[0074] The pixel compensation circuit driving method in this embodiment separates data writing and compensation, so the compensation time is not limited by the data writing time, which can realize high-frequency driving and improve display uniformity.

[0075] Reference Figure 4 As shown, in one embodiment, the pixel compensation circuit further includes a storage module, the threshold compensation module includes a first threshold compensation module and a second threshold compensation module, and the threshold compensation stage includes a first threshold compensation stage and a second threshold compensation stage.

[0076] The storage module is connected between the control terminal of the driver module and the first terminal of the driver module; the first threshold compensation module is connected between the control terminal of the driver module and the second terminal of the driver module; and the second threshold compensation module is connected to the first terminal of the driver module.

[0077] The first threshold compensation module writes the threshold voltage of the driving module to the first terminal of the driving module during the first threshold compensation stage. The second threshold compensation module couples the threshold voltage of the driving module located at the first terminal of the driving module to the control terminal of the driving module through the storage module during the second threshold compensation stage. This achieves threshold compensation in two stages, which helps to improve the compensation effect and further enhance display uniformity.

[0078] Reference Figure 5 As shown, another embodiment of this disclosure discloses a driving method for a pixel compensation circuit, applied to the pixel compensation circuit in the above embodiment, wherein,

[0079] In step S20, the threshold compensation module compensates the threshold voltage of the driving module, including:

[0080] Step S21: In the first threshold compensation stage, the first threshold compensation module writes the threshold voltage of the driving module to the first terminal of the driving module.

[0081] Step S22: In the second threshold compensation stage, the second threshold compensation module couples the threshold voltage of the drive module located at the first end of the drive module to the control terminal of the drive module through the storage module.

[0082] In one embodiment, the voltage writing module includes a fixed voltage writing unit and a data voltage writing unit; both the fixed voltage writing unit and the data voltage writing unit are connected to the first end of the coupling module; the fixed voltage writing unit is used to output a fixed voltage to the first end of the coupling module during the initialization phase; the data voltage writing unit is used to output a data voltage to the first end of the coupling module during the data writing phase. Using two separate writing units to implement fixed voltage writing and data voltage writing facilitates control.

[0083] Reference Figure 6As shown, another embodiment of this disclosure discloses a driving method for a pixel compensation circuit, applied to the pixel compensation circuit in the above embodiment, wherein,

[0084] In step S10, the voltage writing module outputs a fixed voltage to the first terminal of the coupling module, including:

[0085] Step S11: The fixed voltage writing unit outputs a fixed voltage to the first terminal of the coupling module;

[0086] Step S12: The data voltage writing unit outputs data voltage to the first end of the coupling module.

[0087] In one embodiment, the pixel compensation circuit further includes a leakage protection module, which is connected between the second end of the coupling module and the control end of the driving module. The leakage protection module can reduce leakage current at the control end of the control module.

[0088] In one embodiment, the pixel compensation circuit further includes a first reset module, which is connected to the second end of the coupling module, and is used to reset the control terminal of the driving module.

[0089] In one embodiment, the pixel compensation circuit further includes a light-emitting module. The anode of the light-emitting module is connected to the second terminal of the driving module. The light-emitting module emits light during the light-emitting phase, the driving module generates a driving current, and the light-emitting module responds to the driving current. The light-emitting module can be an OLED, AMOLED, or similar type.

[0090] In one embodiment, the pixel compensation circuit further includes a second reset module connected to the anode of the light-emitting module. The second reset module is used to reset the anode of the light-emitting module. Specifically, the second reset module is used to reset the anode of the light-emitting module after the data writing stage and before the light-emitting module emits light, so as to improve the light-emitting effect of the light-emitting module.

[0091] In one embodiment, the pixel compensation circuit further includes a first light-emitting control module connected to a first terminal of the driving module. The first light-emitting control module is turned on during the initialization and light-emitting phases, and turned off during the data writing phase. This prevents the light-emitting module from emitting light during the data writing phase. Specifically, the first light-emitting control module is turned off during the adjustment module's operation phase to prevent the light-emitting module from emitting light when the adjustment module performs feature adjustment on the driving module.

[0092] In one specific embodiment, the first terminal of the driving module is connected to the first power signal ELVDD, the first terminal of the fixed voltage writing unit is connected to the reset voltage signal Vini, the control terminal of the fixed voltage writing unit is connected to the first reset signal Re1, the control terminal of the first threshold compensation module is connected to the first reset signal Re1, the control terminal of the leakage protection module is connected to the second reset signal Re2, the control terminal of the second threshold compensation module is connected to the third reset signal Re3, the control terminal of the first reset module is connected to the first scan signal S1, the first terminal of the first reset module is connected to the first reference signal Vref1, the second terminal of the first reset module is connected to the second terminal of the coupling module, the control terminal of the second reset module is connected to the second scan signal S2, the first terminal of the second reset module is connected to the second reference signal Vref2, the second terminal of the second reset module is connected to the anode of the light-emitting unit, the control terminal of the second threshold compensation module is connected to the third reset signal Re3, the first terminal of the second threshold compensation module is connected to the first reference signal Vref1, and the second terminal of the second threshold compensation module is connected to the first terminal of the driving module.

[0093] Reference Figure 7 As shown, in another specific embodiment, the driving module includes a thin-film transistor T1, the data voltage writing unit includes a thin-film transistor T2, the storage module includes a capacitor Cst, the coupling module includes a capacitor C2, the fixed voltage writing unit includes a thin-film transistor T3, the first reset module includes a thin-film transistor T6, the second threshold compensation module includes a thin-film transistor T8, the first threshold compensation module includes a thin-film transistor T5, the light-emitting module includes an OLED, the leakage protection module includes a thin-film transistor T4, the second reset module includes a thin-film transistor T7, and the first light-emitting control module includes a thin-film transistor T9.

[0094] In this configuration, the control terminal of thin-film transistor T9 is connected to the first enable signal EM1, the first terminal of thin-film transistor T9 is connected to the first power supply signal ELVDD, the second terminal of thin-film transistor T9 is electrically connected to the first terminal (S) of thin-film transistor T1, the first terminal of capacitor Cst is electrically connected to the second terminal of thin-film transistor T9, the control terminal (G) of thin-film transistor T1 is electrically connected to the second terminal of capacitor Cst, the control terminal of thin-film transistor T4 is connected to the second reset signal Re2, the first terminal of thin-film transistor T4 is electrically connected to the second terminal of capacitor Cst, the second terminal of capacitor C2 is electrically connected to the second terminal of thin-film transistor T4, the first terminal of capacitor C2 is electrically connected to the second terminal of thin-film transistor T3, the first terminal of thin-film transistor T3 is connected to the reset voltage signal Vini, the control terminal of thin-film transistor T3 is connected to the first reset signal Re1, the control terminal of thin-film transistor T2 is connected to the second scan signal S2, the first terminal of thin-film transistor T2 is connected to the data voltage signal Vdata, and the second terminal of thin-film transistor T2 is connected to the second reset signal S2. The first terminal of capacitor C2 is electrically connected. The control terminal of thin-film transistor T6 is connected to the first scan signal S1. The first terminal of thin-film transistor T6 is connected to the first reference signal Vref1. The second terminal of thin-film transistor T6 is electrically connected to the second terminal of thin-film transistor T4. The control terminal of thin-film transistor T5 is connected to the first reset signal Re1. The first terminal of thin-film transistor T5 is electrically connected to the second terminal of thin-film transistor T4. The second terminal of thin-film transistor T5 is electrically connected to the second terminal (D) of thin-film transistor T1. The cathode of OLED is connected to the second power supply signal ELVSS. The control terminal of thin-film transistor T7 is connected to the third scan signal S3. The second terminal of thin-film transistor T7 is electrically connected to the second terminal of thin-film transistor T10. The first terminal of thin-film transistor T7 is connected to the second reference signal Vref2. The first terminal of thin-film transistor T8 is connected to the first reference signal Vref1. The second terminal of thin-film transistor T8 is electrically connected to the first terminal of thin-film transistor T1. The control terminal of thin-film transistor T8 is connected to the third reset signal Re3.

[0095] Reference Figure 8 The diagram shown is a signal timing diagram corresponding to the pixel compensation circuit in another embodiment of this disclosure. Figure 7 The pixel compensation circuit in the image. Further, the driving method of this pixel compensation circuit includes the following steps:

[0096] A10. During the initialization phase (T1), the fixed voltage writing module outputs a fixed voltage to the first terminal of the coupling module; the data voltage writing unit outputs a data voltage to the first terminal of the coupling module; specifically, refer to... Figure 8When signals Re1 / Re2 / EM1 / S1 are low and the rest are high, thin-film transistors T3 / T4 / T5 / T6 / T9 are turned on and the rest are turned off. The first reference signal Vref1 is written to point G of the gate of thin-film transistor T1, and the reset voltage signal Vini is written to the first terminal of capacitor C2.

[0097] A20. In the first threshold compensation stage (T2), the first threshold compensation module writes the threshold voltage of the drive module to the first terminal of the drive module; specifically, refer to... Figure 8 Signals Re1 / 2 / S1 are at a low level, and the rest are at a high level. Thin-film transistors T3 / T4 / T5 / T6 are turned on, and the rest are turned off. The potential at point G of thin-film transistor T1 is Vref1. After threshold voltage Vth compensation, the potential at point S is Vref1-Vth. The threshold voltage Vth information is stored on capacitor Cst, and the reset voltage signal Vini is stored on capacitor C2.

[0098] A30. In the second threshold compensation stage (T3), the second threshold compensation module couples the threshold voltage of the drive module located at the first end of the drive module to the control terminal of the drive module through the storage module; specifically, refer to... Figure 8 Signal S1 is set high, signal Re3 is set low, and the rest of the states remain unchanged. The potential at point S is Vref1, and the potential at point G is Vref1+Vth.

[0099] A40. During the data writing stage (T4), the voltage writing module outputs a data voltage to the first terminal of the coupling module, and couples the voltage containing the data voltage information to the control terminal of the drive module through the coupling module; specifically, refer to... Figure 8 Signals Re2 / Re3 / S2 are at low level, and all other signals are at high level. Thin-film transistors T2, T4, and T8 remain on, while the rest of the thin-film transistors are off. Vdata passes through thin-film transistor T2 to point N, and is coupled to point G of thin-film transistor T1 through capacitor C2. VG = Vref1 + Vth + k*(Vdata - Vini), k = C2 / (Cst + C2 + Cgs), where Cgs is the parasitic capacitance between the gate and source of thin-film transistor T1.

[0100] A50. During the light-emitting stage (T5), the driver module responds to the data voltage signal and controls the light-emitting module to emit light. For details, refer to... Figure 8 When signals EM1 / EM2 are low and the rest are high, thin-film transistors T9 / T1 are turned on, and the OLED emits light. The emitting current is:

[0101] Reference Figure 9As shown, in one embodiment, the pixel compensation circuit further includes an adjustment module connected to the first end of the driving module. The adjustment module is used to adjust the characteristics of the driving module to ensure that the voltage and current of the driving module are consistent each time it emits light, thus ensuring uniformity.

[0102] In one embodiment, the pixel compensation circuit further includes: a second light emission control module, the first end of which is connected to the second end of the driving module, and the second end of which is connected to the anode of the light emission module.

[0103] In one specific embodiment, the control terminal of the adjustment module is connected to the third scanning signal S3, and the control terminal of the second light emission control module is connected to the second enable signal EM2.

[0104] Reference Figure 10 As shown, in another specific embodiment, the second light-emitting control module includes a thin-film transistor T10, the first terminal of the thin-film transistor T1 is electrically connected to the second terminal (D) of the thin-film transistor T1, the control terminal of the thin-film transistor T10 is connected to a second enable signal EM2, the second terminal of the thin-film transistor T10 is electrically connected to the anode of the OLED, and the adjustment module includes a thin-film transistor T11, the control terminal of the thin-film transistor T11 is connected to a third scan signal S3, the first terminal of the thin-film transistor T11 is connected to an adjustment signal VEH, and the second terminal of the thin-film transistor T11 is electrically connected to the first terminal of the thin-film transistor T1.

[0105] Reference Figure 11 The diagram shown is a signal timing diagram corresponding to the pixel compensation circuit in another embodiment of this disclosure. Figure 10 The pixel compensation circuit in the image. Further, the driving method of this pixel compensation circuit includes the following steps:

[0106] B10. During the initialization phase (T1), the fixed voltage writing module outputs a fixed voltage to the first terminal of the coupling module; the data voltage writing unit outputs a data voltage to the first terminal of the coupling module; specifically, refer to... Figure 11 When signals Re1 / Re2 / EM1 / S1 are low and the rest are high, thin film transistors T3 / T4 / T5 / T6 / T9 are turned on and the rest are turned off. The first reference signal Vref1 is written to point G of the gate of thin film transistor T1, and the reset voltage signal Vini is written to the first terminal of capacitor C2.

[0107] B20. In the first threshold compensation stage (T2), the first threshold compensation module writes the threshold voltage of the drive module to the first terminal of the drive module; specifically, refer to... Figure 11Signals Re1 / 2 / S1 are at a low level, and the rest are at a high level. Thin-film transistors T3 / T4 / T5 / T6 are turned on, and the rest are turned off. The potential at point G of thin-film transistor T1 is Vref1. After threshold voltage Vth compensation, the potential at point S is Vref1-Vth. The threshold voltage Vth information is stored on capacitor Cst, and the reset voltage signal Vini is stored on capacitor C2.

[0108] B30, In the second threshold compensation stage (T3), the second threshold compensation module couples the threshold voltage of the drive module located at the first end of the drive module to the control terminal of the drive module through the storage module; specifically, refer to... Figure 11 Signal S1 is set high, signal Re3 is set low, and the rest of the states remain unchanged. The potential at point S is Vref1, and the potential at point G is Vref1+Vth.

[0109] B40. During the data writing stage (T4), the voltage writing module outputs a data voltage to the first terminal of the coupling module, and couples the voltage containing the data voltage information to the control terminal of the drive module through the coupling module; specifically, refer to... Figure 11 Signals Re2 / Re3 / S2 are at low level, and all other signals are at high level. Thin-film transistors T2, T4, and T8 remain on, while the rest of the thin-film transistors are off. Vdata passes through thin-film transistor T2 to point N, and is coupled to point G of thin-film transistor T1 through capacitor C2. VG = Vref1 + Vth + k*(Vdata - Vini), k = C2 / (Cst + C2 + Cgs), where Cgs is the parasitic capacitance between the gate and source of thin-film transistor T1.

[0110] B50. In the characteristic adjustment and anode reset stage (T5), the characteristics of the drive module are adjusted by the adjustment module to improve the display uniformity of the display module; the anode of the light-emitting module is reset by the second reset module to improve the light-emitting effect of the light-emitting module. For details, refer to... Figure 11 When signal S3 is low and the others are high, thin-film transistors T7 / T11 are turned on, and the rest are turned off.

[0111] B60. During the light-emitting stage (T6), the driver module responds to the data voltage signal and controls the light-emitting module to emit light. For details, refer to... Figure 11 When signals EM1 / EM2 are low and the rest are high, thin-film transistors T9 / T1 / T10 are turned on, and the OLED emits light. The emitting current is:

[0112] Another embodiment of this disclosure discloses a display panel that includes the pixel compensation circuit described in the above embodiments. This display panel can be mounted on smart devices (such as mobile phones, VR devices, computers, televisions, in-vehicle displays, etc.).

[0113] Although this disclosure has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0114] It should be noted that the above description describes some embodiments of this disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0115] This disclosure is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A pixel compensation circuit, characterized in that, include: The module consists of a driver module, a voltage writing module, a coupling module, and a threshold compensation module. The threshold compensation module is connected to the driving module, and the threshold compensation module is used to compensate the threshold voltage of the driving module during the threshold compensation stage. The first end of the coupling module is connected to the voltage writing module, and the second end of the coupling module is connected to the control end of the driving module. The voltage writing module is used to output a fixed voltage to the first end of the coupling module during the initialization phase and to output a data voltage to the first end of the coupling module during the data writing phase. The coupling module is used to couple a voltage containing the data voltage information to the control end of the driving module during the data writing phase. The start time of the data writing phase is later than the end time of the threshold compensation phase; It also includes a storage module, the threshold compensation module includes a first threshold compensation module and a second threshold compensation module, and the threshold compensation stage includes a first threshold compensation stage and a second threshold compensation stage; The storage module is connected between the control terminal of the drive module and the first terminal of the drive module, the first threshold compensation module is connected between the control terminal of the drive module and the second terminal of the drive module, and the second threshold compensation module is connected to the first terminal of the drive module. The first threshold compensation module is used to write the threshold voltage of the driving module to the first terminal of the driving module during the first threshold compensation stage, and the control terminal of the driving module maintains the first reference signal. The second threshold compensation module is used to couple the threshold voltage of the driving module located at the first end of the driving module to the control terminal of the driving module through the storage module during the second threshold compensation stage, thereby realizing threshold compensation in two stages.

2. The pixel compensation circuit as described in claim 1, characterized in that, The voltage writing module includes a fixed voltage writing unit and a data voltage writing unit; Both the fixed voltage writing unit and the data voltage writing unit are connected to the first end of the coupling module; The fixed voltage writing unit is used to output a fixed voltage to the first terminal of the coupling module during the initialization phase; The data voltage writing unit is used to output data voltage to the first end of the coupling module during the data writing phase.

3. The pixel compensation circuit as described in claim 1, characterized in that, Also includes: A leakage protection module is connected between the second end of the coupling module and the control end of the drive module.

4. The pixel compensation circuit as described in claim 1, characterized in that, It also includes a first reset module, which is connected to the second end of the coupling module, and is used to reset the control terminal of the drive module.

5. The pixel compensation circuit as described in claim 1, characterized in that, Also includes: An adjustment module is connected to the first end of the drive module, and the adjustment module is used to adjust the characteristics of the drive module.

6. The pixel compensation circuit as described in claim 1, characterized in that, Also includes: The light-emitting module has its anode connected to the second end of the driving module, and is used to emit light during the light-emitting phase.

7. The pixel compensation circuit as described in claim 6, characterized in that, It also includes a second reset module, which is connected to the anode of the light-emitting module and is used to reset the anode of the light-emitting module.

8. The pixel compensation circuit as described in claim 1, characterized in that, Also includes: A first light-emitting control module is connected to a first end of the driving module. The first light-emitting control module is turned on during the initialization and light-emitting phases, and turned off during the data writing phase.

9. The pixel compensation circuit as described in claim 6, characterized in that, Also includes: The second light-emitting control module has a first end connected to the second end of the driving module and a second end connected to the anode of the light-emitting module.

10. A driving method for a pixel compensation circuit, applied to the pixel compensation circuit as described in any one of claims 1-9, wherein the pixel compensation circuit comprises a driving module, a voltage writing module, a coupling module, and a threshold compensation module; characterized in that, The driving method of the pixel compensation circuit includes: During the initialization phase, the voltage writing module outputs a fixed voltage to the first terminal of the coupling module; During the threshold compensation phase, the threshold compensation module compensates the threshold voltage of the driving module; During the data writing phase, the voltage writing module outputs a data voltage to the first terminal of the coupling module, and couples the voltage containing the data voltage information to the control terminal of the drive module through the coupling module.

11. The driving method for the pixel compensation circuit as described in claim 10, characterized in that, The pixel compensation circuit further includes a storage module, the threshold compensation module includes a first threshold compensation module and a second threshold compensation module, and the threshold compensation stage includes a first threshold compensation stage and a second threshold compensation stage. The threshold compensation module compensates the threshold voltage of the driving module, including: During the first threshold compensation stage, the first threshold compensation module writes the threshold voltage of the driving module to the first terminal of the driving module; During the second threshold compensation stage, the second threshold compensation module couples the threshold voltage of the driving module located at the first end of the driving module to the control terminal of the driving module through the storage module.

12. The driving method for the pixel compensation circuit as described in claim 10, characterized in that, The voltage writing module includes a fixed voltage writing unit and a data voltage writing unit; The voltage writing module outputs a fixed voltage to the first terminal of the coupling module, including: The fixed voltage writing unit outputs a fixed voltage to the first terminal of the coupling module; The voltage writing module outputs a data voltage to the first terminal of the coupling module, including: The data voltage writing unit outputs a data voltage to the first end of the coupling module.

13. A display panel, characterized in that: Includes the pixel compensation circuit as described in any one of claims 1-9.

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