Pixel circuit and display panel

Abstract

This invention discloses a pixel circuit and a display panel. The pixel circuit includes: a data writing module, a driving module, a light-emitting module, a storage module, a coupling module, and a voltage generation module. The data writing module is used to write data signals to the control terminal of the driving module; the driving module is used to generate a driving current, the light-emitting module is used to display in response to the driving current, and the storage module is used to maintain the potential of the control terminal of the driving module; the voltage generation module is used to generate a feedback voltage based on the current flowing through the light-emitting module; and the coupling module is used to couple the feedback voltage to the control terminal of the driving module. This invention improves the accuracy of pixel circuit display.

Description

Technical Field

[0001] The present invention relates to display technology, and more particularly to a pixel circuit and a display panel. Background Technology

[0002] With the development of display technology, display panels are being used more and more widely, and the requirements for display panels are also getting higher and higher.

[0003] However, existing display panels are prone to display errors when displaying grayscale, which seriously affects the display effect. Summary of the Invention

[0004] This invention provides a pixel circuit and a display panel to ensure that the display panel can display correctly.

[0005] In a first aspect, embodiments of the present invention provide a pixel circuit, the pixel circuit comprising:

[0006] The module includes a data writing module, a driving module, a light-emitting module, a storage module, a coupling module, and a voltage generation module.

[0007] The data writing module is used to write data signals to the control terminal of the driving module; the driving module is used to generate driving current, the light-emitting module is used to display in response to the driving current, and the storage module is used to maintain the potential of the control terminal of the driving module.

[0008] The voltage generation module is used to generate a feedback voltage based on the current flowing through the light-emitting module;

[0009] The coupling module is used to couple the feedback voltage to the control terminal of the drive module.

[0010] Optionally, the voltage generation module includes: a first resistive element;

[0011] The first end of the first resistive element is electrically connected to the light-emitting module, the first end of the first resistive element is electrically connected to the first end of the coupling module, and the second end of the first resistive element is connected to the first power supply voltage.

[0012] Optionally, the pixel circuit further includes a sensing module and a control module, wherein the sensing module is used to sense the current flowing through the light-emitting module to generate a sensing current; and the control module generates a control signal based on the sensing current.

[0013] The first resistive element is an adjustable resistive element; the first resistive element is configured to adjust its resistance value according to the control signal.

[0014] Optionally, the first resistive element includes a first transistor, with a first terminal of the first transistor serving as the first terminal of the first resistive element, a second terminal of the first transistor serving as the second terminal of the first resistive element, and a control terminal of the first transistor being electrically connected to the control module.

[0015] Optionally, the pixel circuit further includes: a current replication module;

[0016] The first resistive element is electrically connected to the light-emitting module through the current replication module. The current replication module is used to replicate the current flowing through the light-emitting module to the voltage generating module. The current replication module includes an input unit and an output unit. The input unit is used to input current, and the output unit is used to output current. The first resistive element is electrically connected to the output unit of the current replication module.

[0017] Optionally, the current replication module includes a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a second resistive element;

[0018] The input unit is the second transistor, and the control terminal of the second transistor is electrically connected to the first terminal of the second transistor.

[0019] The first terminal of the third transistor is connected to the second power supply voltage, the second terminal of the third transistor is electrically connected to the first terminal of the fourth transistor, and the control terminal of the third transistor is electrically connected to the second terminal of the third transistor.

[0020] The control terminal of the fourth transistor is electrically connected to the control terminal of the second transistor, and the second terminal of the fourth transistor is connected to the first power signal;

[0021] The first terminal of the fifth transistor is connected to the second power supply voltage, the second terminal of the fifth transistor is electrically connected to the first terminal of the second resistive element, and the control terminal of the fifth transistor is electrically connected to the control terminal of the third transistor.

[0022] The output unit includes the fifth transistor and the second resistive element.

[0023] Optionally, the first end of the data writing module is connected to the data signal, the second end of the data writing module is electrically connected to the control end of the driving module, and the control end of the data writing module is connected to the first scan signal; the first end of the storage module is connected to the second power supply voltage, and the second end of the storage module is electrically connected to the control end of the driving module.

[0024] The first terminal of the driving module is connected to the second power supply voltage, the second terminal of the driving module is electrically connected to the first terminal of the light-emitting module through the input unit of the current replication module, and the second terminal of the light-emitting module is connected to the first power supply voltage.

[0025] The first end of the coupling module is electrically connected to the first resistive element, and the second end of the coupling module is electrically connected to the control end of the drive module;

[0026] The first end of the sensing module is electrically connected to the first end of the light-emitting module, the second end of the sensing module is electrically connected to the control module, and the control end of the sensing module receives a sensing scan signal.

[0027] Optionally, the pixel circuit further includes a threshold compensation module, a first light emission control module, a second light emission control module, and an initialization module;

[0028] The first end of the data writing module is connected to the data signal, the second end of the data writing module is electrically connected to the first end of the driving module, and the control end of the data writing module is connected to the second scan signal.

[0029] The first terminal of the first light-emitting control module is connected to the second power supply voltage, the second terminal of the first light-emitting control module is electrically connected to the first terminal of the driving module, and the control terminal of the first light-emitting module is connected to the light-emitting control signal.

[0030] The second end of the driving module is electrically connected to the first end of the second light-emitting control module, the first end of the storage module is connected to the second power supply voltage, and the second end of the storage module is electrically connected to the control end of the driving module.

[0031] The first end of the threshold compensation module is electrically connected to the second end of the drive module, the second end of the threshold compensation module is electrically connected to the control end of the drive module, and the control end of the threshold compensation module is connected to the second scan signal;

[0032] The first end of the second light-emitting control module is electrically connected to the second end of the driving module. The control end of the second light-emitting control module is connected to the light-emitting control signal. The second end of the second light-emitting control module is electrically connected to the first end of the light-emitting module through the input module of the current replication module. The second end of the light-emitting module is connected to the first power supply voltage.

[0033] The first end of the coupling module is electrically connected to the first resistive element, and the second end of the coupling module is electrically connected to the control end of the drive module;

[0034] The first terminal of the initialization module is connected to an initialization signal, the second terminal of the initialization module is electrically connected to the control terminal of the drive module, and the control terminal of the initialization module is connected to a third scan signal.

[0035] The first end of the sensing module is electrically connected to the first end of the light-emitting module, the second end of the sensing module is electrically connected to the control module, and the control end of the sensing module receives a sensing scan signal.

[0036] Optionally, the coupling module includes a first capacitor.

[0037] Secondly, embodiments of the present invention also provide a display panel, the display panel including a plurality of pixel circuits as described in the first aspect.

[0038] The technical solution of this invention employs a pixel circuit comprising a data writing module, a driving module, a light-emitting module, a storage module, a coupling module, and a voltage generation module. The data writing module writes data signals to the control terminal of the driving module. The driving module generates a driving current, the light-emitting module displays the signal in response to the driving current, and the storage module maintains the potential at the control terminal of the driving module. The voltage generation module generates a feedback voltage based on the current flowing through the light-emitting module. The coupling module couples the feedback voltage to the control terminal of the driving module. The voltage generation module generates a feedback voltage based on the magnitude of the driving current, which is then fed back to the control terminal of the driving module, thereby adaptively adjusting the driving current of the driving module and improving the accuracy of the pixel circuit display. Attached Figure Description

[0039] Figure 1 A schematic diagram of a pixel circuit structure provided in an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0042] Figure 4 A schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0043] Figure 5 A schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0044] Figure 6 A timing diagram of a pixel circuit provided in an embodiment of the present invention;

[0045] Figure 7A schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0046] Figure 8 Another timing diagram of a pixel circuit provided in an embodiment of the present invention;

[0047] Figure 9 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] As mentioned in the background section, existing display panels are prone to display errors. After careful research, the applicant discovered that the reason for this technical problem is that the leakage current of the pixel circuit increases when it works for a long time, which leads to an increase in the current flowing through the light-emitting module compared to the normal current value, resulting in grayscale display errors.

[0050] Based on the above-mentioned technical problems, the present invention proposes the following solutions:

[0051] Figure 1 This is a schematic diagram of a pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 1 The pixel circuit provided in this embodiment of the invention includes: a data writing module 101, a driving module 102, a light-emitting module 103, a storage module 104, a coupling module 105, and a voltage generation module 106; the data writing module 101 is used to write data signals to the control terminal of the driving module 102; the driving module 102 is used to generate a driving current, the light-emitting module 103 is used to display in response to the driving current, and the storage module 104 is used to maintain the potential of the control terminal of the driving module 102; the voltage generation module 106 is used to generate a feedback voltage according to the current flowing through the light-emitting module 103; wherein, the larger the current flowing through the light-emitting module 103, the larger the feedback voltage; the coupling module 105 is used to couple the feedback voltage to the control terminal of the driving module 102.

[0052] Specifically, the light-emitting module 103 can be an OLED (Organic Light Emitting Diode) or Micro LED, etc., the specific structure of which is well known to those skilled in the art and will not be described in detail here. The light-emitting module 103 is a current-type device, which needs to respond to the driving current to display the corresponding gray level. A typical analog driving circuit of the light-emitting module 103 includes at least a data writing module 101, a storage module 104, and a driving module 102. After the data writing module 101 writes the data signal to the control terminal of the driving module 102 during the data writing stage, the driving module 102 generates a driving current according to the data signal during the light-emitting stage, thereby driving the light-emitting module 103 to display the corresponding gray level. Since the light-emitting stage lasts for a relatively long time, the storage module 104 is needed to maintain the potential of the control terminal of the driving module 102, thereby ensuring the stability of the potential of the control terminal of the driving module 102 during the light-emitting stage, and thus ensuring that the light-emitting module 103 emits light stably. After prolonged use, the driving module 102 of the pixel circuit will experience aging, which will increase the leakage current of the driving module 102 and increase the driving current compared to the normal value. As a result, the grayscale displayed by the light-emitting module 103 will not correspond to the applied data signal, resulting in a display error. In this embodiment, by adding a voltage generation module 106 and a coupling module 105, when the driving module 102 is not aged, the driving current generated by the driving module 102 in the light-emitting stage is set as the first driving current at a preset grayscale. At this time, the voltage generation module 106 generates a feedback voltage based on the first driving current, which is set as the first feedback voltage. The first feedback voltage is coupled to the control terminal of the driving module 102 through the coupling module 105, and together with the storage module 104, controls the voltage of the control terminal of the driving module 102. According to the current formula of the driving module 102, the larger the voltage of its control terminal, the smaller the driving current. When the driving module 102 is aged, the driving current generated by the driving module 102 in the light-emitting stage is set as the second driving current at the same preset grayscale. The second driving current is greater than the first driving current. At this time, the voltage generation module 106 generates a feedback voltage based on the second driving current, which is set as the second feedback voltage. The second feedback voltage is greater than the first feedback voltage, thereby increasing the potential of the control terminal of the driving module 102, thereby reducing the driving current generated by the driving module 102, thereby correcting the grayscale displayed by the light-emitting module 103 and improving the accuracy of the display of the light-emitting module 103. It should be noted that when the driving current of the driving module 102 decreases relative to the normal value, the feedback voltage generated by the voltage generation module 106 also decreases accordingly, which reduces the voltage at the control terminal of the driving module 102, thereby increasing the driving current of the driving module 102, correcting the grayscale displayed by the light-emitting module 103, and improving the accuracy of the display of the light-emitting module 103.

[0053] The technical solution of this embodiment employs a pixel circuit including a data writing module, a driving module, a light-emitting module, a storage module, a coupling module, and a voltage generation module. The data writing module writes data signals to the control terminal of the driving module. The driving module generates a driving current, the light-emitting module responds to the driving current for display, and the storage module maintains the potential at the control terminal of the driving module. The voltage generation module generates a feedback voltage based on the current flowing through the light-emitting module. The coupling module couples the feedback voltage to the control terminal of the driving module. The voltage generation module generates a feedback voltage based on the magnitude of the driving current, which is then fed back to the control terminal of the driving module via the coupling module. This allows for adaptive adjustment of the driving current of the driving module, improving the accuracy of the pixel circuit display.

[0054] Optionally, Figure 2 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, with reference to... Figure 2 The voltage generation module 106 includes: a first resistive element R1; the first end of the first resistive element R1 is electrically connected to the light-emitting module 103, the first end of the first resistive element R1 is electrically connected to the first end of the coupling module 105, and the second end of the first resistive element R1 is connected to the first power supply voltage VSS; the second end of the coupling module 105 is electrically connected to the control end of the driving module 102.

[0055] Specifically, in this embodiment, the first resistive element R1 can be, for example, a resistor, and its first end can be electrically connected to the anode of the light-emitting module 103 or to the cathode of the light-emitting module 103, as long as it can receive the current flowing through the light-emitting module 103; the first power signal VSS can provide a current path for the current flowing through the light-emitting module 103. The first power signal VSS can be at a low level. In this embodiment, the feedback voltage can be generated according to the magnitude of the driving current through the first resistive element R1. The circuit structure is simple and helps to reduce costs.

[0056] Optionally, Figure 3 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, with reference to... Figure 3 The pixel circuit also includes a sensing module 107 and a control module (not shown). The sensing module 107 is used to sense the current flowing through the light-emitting module 102 to generate a sensing current. The control module generates a control signal based on the sensing current. The first resistive element R1 is an adjustable resistive element. The first resistive element R1 is configured to adjust its resistance value according to the control signal.

[0057] Specifically, in the above embodiments, the pixel circuit can adaptively adjust the magnitude of the driving current. Although this can improve the mismatch between the displayed grayscale and the corresponding data signal to a certain extent, it cannot precisely control the magnitude of the driving current, and therefore cannot accurately control the grayscale displayed by the light-emitting module 103. In this embodiment, a sensing module 107 is provided. The first end of the sensing module 107 can be electrically connected to the first end of the light-emitting module 103. The second end of the sensing module 107 outputs a sensing signal Sense to the control module. The control end of the sensing module 107 is connected to the sensing scan signal Sense_SW. During the light-emitting stage, the sensing module 107 is controlled to sense the current flowing through the light-emitting module 103 in real time to generate a sensing current. The control module can generate a control signal Vct according to the magnitude of the sensing current, and then adjust the resistance value of the first resistive element R1 in real time, thereby accurately controlling the driving current of the driving module 102, so that the light-emitting module 103 can accurately display the corresponding grayscale. The control module can be, for example, a driver chip.

[0058] For example, continue to refer to Figure 3 The first resistive element R1 includes a first transistor, the first end of the first transistor serves as the first end of the first resistive element, the second end of the first transistor serves as the second end of the first resistive element, and the control end of the first transistor is electrically connected to the control module.

[0059] Specifically, the first resistive element R1 can be implemented using a first transistor, which is a triode. One of the emitter and collector of the first transistor is the first terminal of the first resistive element R1, and the other is the second terminal of the first resistive element R1. The base of the first transistor is the control terminal of the first transistor. The first transistor can be a PNP triode. When the PNP triode operates in the variable resistance region, its resistance increases with the increase of the control voltage and decreases with the decrease of the control voltage.

[0060] Optionally, Figure 4 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, with reference to... Figure 4 The pixel circuit also includes a current replication module 108; the first resistive element R1 is electrically connected to the light-emitting module 103 through the current replication module, and the current replication module 108 is used to replicate the current flowing through the light-emitting module 103 to the voltage generation module (the first resistive element R1); wherein, the current replication module 108 includes an input unit and an output unit, the input unit is used to input current, the output unit is used to output current, and the first resistive element R1 is electrically connected to the output unit of the current replication module 108.

[0061] Specifically, when the first resistive element R1 is directly electrically connected to the light-emitting module 103, it may increase the load on the second end of the driving module 102, affecting the display effect; on the other hand, it may also cause the first resistive element R1 to affect the light-emitting module 103. In this embodiment, by setting the current replication module 108, the current flowing through the light-emitting module 103 is replicated to the first resistive element R1 without loss. On the one hand, this can improve the load-carrying capacity of the driving module 102, and on the other hand, it can isolate the first resistive element R1 from the light-emitting module 103, preventing the current on the first resistive element R1 from flowing back to the light-emitting module 103, thus greatly improving the accuracy of the pixel circuit display.

[0062] For example, such as Figure 4 As shown, the current replication module 108 includes a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, and a second resistive element R2. The input unit is the second transistor, with the control terminal of the second transistor M2 electrically connected to its first terminal. The first terminal of the third transistor M3 is connected to the second power supply voltage VDD, and the second terminal of the third transistor M3 is electrically connected to the first terminal of the fourth transistor M4. The control terminal of the third transistor M3 is also electrically connected to its second terminal. The control terminal of the fourth transistor M4 is electrically connected to the control terminal of the second transistor M2, and the first terminal of the fourth transistor M4 is connected to the first power supply signal VSS. The first terminal of the fifth transistor M5 is connected to the second power supply voltage VDD, and the second terminal of the fifth transistor M5 is electrically connected to the first terminal of the second resistive element R2. The control terminal of the fifth transistor M5 is also electrically connected to the control terminal of the third transistor M3. The output unit includes the fifth transistor M5 and the second resistive element R2.

[0063] Specifically, the second transistor M2, the third transistor M3, the fourth transistor M4, and the fifth transistor M5 constitute a current mirror. The third transistor M3 and the fourth transistor M4 can be understood as intermediate units of the current replication module 108. The current flowing through the second transistor M2 is first replicated to the fourth transistor M4, meaning the current flowing through the third transistor M3 is the same as the current flowing through the second transistor M2. Subsequently, the fifth transistor M5 replicates the current flowing through the third transistor M3 to itself, thus replicating the current flowing through the light-emitting module 103 without loss to the first resistive element R1. The second resistive element R2 can be a resistor. The second transistor M2, the third transistor M3, the fourth transistor M4, and the fifth transistor M5 can be P-type transistors or N-type transistors; this embodiment uses P-type transistors as an example. Their first terminals can be either the drain or the source, and their control terminals are the gates. The second power supply voltage VDD can be high.

[0064] For example, Figure 5This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, with reference to... Figure 5 The first terminal of the data writing module 101 is connected to the data signal Data, and the second terminal of the data writing module 101 is electrically connected to the control terminal of the driving module 102. The control terminal of the data writing module 101 is connected to the first scan signal S1. The first terminal of the storage module 104 is connected to the second power supply voltage VDD, and the second terminal of the storage module 104 is electrically connected to the control terminal of the driving module 102. The first terminal of the driving module 102 is connected to the second power supply voltage VDD, and the second terminal of the driving module 102 is electrically connected to the first terminal of the light-emitting module 103 through the input unit of the current replication module 108. The second terminal of the light-emitting module 103 is connected to the first power supply voltage VSS. The first terminal of the coupling module 105 is electrically connected to the first resistive element R1, and the second terminal of the coupling module 105 is electrically connected to the control terminal of the driving module 102. The first terminal of the sensing module 107 is electrically connected to the first terminal of the light-emitting module 103, and the second terminal of the sensing module 107 is electrically connected to the control module. The control terminal of the sensing module 107 is connected to the sensing scan signal Sense_SW.

[0065] Specifically, Figure 6 This is a timing diagram of a pixel circuit provided in an embodiment of the present invention. Figure 6 The timing diagram can be compared with Figure 5 Corresponding to the pixel circuit, combined Figure 5 and Figure 6The driving process of the pixel circuit may include a data writing stage t1 and a light emission stage t2; the data writing module 101 includes a sixth transistor M6, the first terminal of the sixth transistor M6 serves as the first terminal of the data writing module 101, the second terminal of the sixth transistor M6 serves as the second terminal of the data writing module 101, and the control terminal of the sixth transistor M6 serves as the control terminal of the data writing module 101; the driving module 102 includes a seventh transistor M7, the first terminal of the seventh transistor M7 serves as the first terminal of the driving module 102, the second terminal of the seventh transistor M7 serves as the second terminal of the driving module 102, and the control terminal of the seventh transistor M7 serves as the control terminal of the driving module 102. The sensing module 107 includes an eighth transistor M8, with its first terminal serving as the first terminal of the sensing module 107, its second terminal serving as the second terminal of the sensing module 107, and its control terminal serving as the control terminal of the sensing module 107. The coupling module 105 includes a first capacitor C1, with its first terminal serving as the first terminal of the coupling module 105, and its second terminal serving as the second terminal of the coupling module 105. The storage module 104 includes a second capacitor C2, with its first terminal serving as the first terminal of the storage module 104, and its second terminal serving as the second terminal of the storage module 104. The sixth transistor M6, the seventh transistor M7, and the eighth transistor M8 can be either P-type or N-type transistors; this embodiment uses a P-type transistor as an example. Their respective first terminals can be either the drain or the source, and their respective control terminals are the gates.

[0066] During the data writing phase t1, the first scan signal S1 is at a low level, which controls the sixth transistor M6 to turn on, and the data signal Data is written to the control terminal of the seventh transistor M7.

[0067] During the light-emitting stage t2, the sixth transistor M6 is turned off, and the seventh transistor M7 controls the light-emitting module 103 to emit light according to the data signal at its control terminal. During the light-emitting stage t2, the sensing scan signal Sense_SW is at a low level, controlling the eighth transistor M8 to turn on. The control module can receive the sensing current Sense in real time, and further generate a control voltage Vct based on the sensing current Sense to control the resistance value of the first resistive element R1, thereby adjusting the potential at the control terminal of the eighth transistor M8 in real time, so as to ensure that the light-emitting module 103 can accurately display the corresponding gray level.

[0068] For example, Figure 7 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, with reference to... Figure 7The pixel circuit also includes a threshold compensation module 109, a first light emission control module 110, a second light emission control module 111, and an initialization module 112. The first terminal of the data writing module 101 is connected to a data signal Data, and the second terminal of the data writing module 101 is electrically connected to the first terminal of the driving module 102. The control terminal of the data writing module 101 is connected to a second scan signal S2. The first terminal of the first light emission control module 110 is connected to a second power supply voltage VDD, and the second terminal of the first light emission control module 110 is electrically connected to the first terminal of the driving module 102. The control terminal of the first light emission control module 110 is connected to a light emission control signal EM. The second terminal of the driving module 102 is electrically connected to the first terminal of the second light emission control module 111. The first terminal of the storage module 104 is connected to the second power supply voltage VDD, and the second terminal of the storage module 104 is electrically connected to the control terminal of the driving module 102. The first terminal of the threshold compensation module 109 is electrically connected to the second terminal of the driving module 102, and the second terminal of the threshold compensation module 109 is electrically connected to the control terminal of the driving module 102. The control terminal of the threshold compensation module 109 is connected to the second scan signal S2; the first terminal of the second light emission control module 111 is electrically connected to the second terminal of the driving module 102, the control terminal of the second light emission control module 111 is connected to the light emission control signal EM, the second terminal of the second light emission control module 111 is electrically connected to the first terminal of the light emission module 103 through the input module of the current replication module 108, and the second terminal of the light emission module 103 is connected to the first power supply voltage VSS; the first terminal of the coupling module 105 is electrically connected to the first resistive element R1, and the second terminal of the coupling module 105 is electrically connected to the control terminal of the driving module 102; the first terminal of the initialization module 112 is connected to the initialization signal Vref, the second terminal of the initialization module 112 is electrically connected to the control terminal of the driving module 102, and the control terminal of the initialization module 112 is connected to the third scan signal S3; the first terminal of the sensing module 107 is electrically connected to the first terminal of the light emission module 103, the second terminal of the sensing module 107 is electrically connected to the control module, and the control terminal of the sensing module 107 is connected to the sensing scan signal Sense_SW.

[0069] Specifically, in this embodiment, the threshold compensation module 109 may include a ninth transistor M9, with its first terminal serving as the first terminal of the threshold compensation module 109, its second terminal serving as the second terminal of the threshold compensation module 109, and its control terminal serving as the control terminal of the threshold compensation module 109; the first light emission control module 110 includes a tenth transistor M10, with its first terminal serving as the first terminal of the first light emission control module 110, its second terminal serving as the second terminal of the first light emission control module 110, and its control terminal serving as the first light emission control module 110. The control terminal of the light control module 110; the second light emission control module 111 includes an eleventh transistor M11, the first terminal of the eleventh transistor M11 serves as the first terminal of the second light emission control module 111, the second terminal of the eleventh transistor M11 serves as the second terminal of the second light emission control module 111, and the control terminal of the eleventh transistor M11 serves as the control terminal of the second light emission control module 111; the ninth transistor M9, the tenth transistor M10, and the eleventh transistor M11 can be P-type transistors or N-type transistors. In this embodiment, P-type transistors are used as examples. Their first terminals can be either drains or sources, and their control terminals are gates.

[0070] Figure 8 This invention provides another timing diagram for a pixel circuit according to an embodiment of the present invention. Figure 8 The timing diagram and Figure 7 The pixel circuit in the text corresponds to, combined with Figure 7 and Figure 8 The driving process of the pixel circuit in this embodiment includes an initialization stage t0, a data writing stage t1, and a light emission stage t2.

[0071] During the initialization phase t0, the third scan signal S3 is low, the twelfth transistor M12 is turned on, and the initialization signal Vref resets the control terminal of the seventh transistor M7, the first capacitor C1, and the second capacitor C2. It should be noted that during the initialization phase t0, the sensing scan signal Sense_SW can be set to low. At this time, the control module sends an initialization signal to the first terminal of the sensing module 107 to initialize the light-emitting module 103 and eliminate the influence of the previous frame signal on the current frame.

[0072] During the data writing phase t1, the second scan signal S2 is at a low level, and the sixth transistor M6 and the ninth transistor M9 are turned on. Since the initialization signal was pre-written to the control terminal of the seventh transistor M7 during the initialization phase t0, the seventh transistor M7 is also turned on during the data writing phase t1. The data signal Data is written to the control terminal of the seventh transistor M7 after passing through the sixth transistor M6, the seventh transistor M7, and the ninth transistor M9. When the difference between the potential of the control terminal of the seventh transistor M7 and the second power supply voltage VDD is equal to the threshold voltage of the seventh transistor M7, the seventh transistor M7 is turned off. This makes the potential of the control terminal of the seventh transistor M7 at this time loaded with the threshold voltage information of the seventh transistor M7, so that the driving current generated by the seventh transistor M7 is independent of the threshold voltage of the seventh transistor M7, that is, the threshold compensation function is realized.

[0073] During the light-emitting stage t2, the light-emitting control signal EM is low, and the tenth transistor M10 and the eleventh transistor M11 are turned on, providing a current path for the light-emitting module 103. According to the driving current formula of the seventh transistor M7, the driving current of the seventh transistor M7 is independent of its threshold voltage at this time. Also during the light-emitting stage t2, the sensing scan signal Sense_SW is low, controlling the eighth transistor M8 to turn on. The control module can receive the sensing current Sense and further generate a control voltage Vct based on the sensing current Sense, controlling the resistance value of the first resistive element R1, thereby adjusting the potential of the control terminal of the eighth transistor M8 in real time, ensuring that the light-emitting module 103 can accurately display the corresponding grayscale.

[0074] It should be noted that in some other embodiments, the sensing module 107 may not be reused to initialize the light-emitting module 103. In this case, the sensing scan signal Sense_SW can be multiplexed from the enable signal EM. In this embodiment, the second terminal of the sensing module 108 may also be electrically connected to the cathode of the light-emitting module 103.

[0075] This invention also provides a display panel, such as... Figure 9 As shown, Figure 9This is a schematic diagram of a display panel provided in an embodiment of the present invention. The display panel includes multiple scan lines (GL1-GLk) and a pixel circuit 100 provided in any embodiment of the present invention. The display panel may include crisscrossing scan lines and data lines (DL1-DLn). The scan lines are electrically connected to the scan driving circuit 30 to provide a first scan signal S1 or a second scan signal S2 and a third scan signal S3. The data lines are electrically connected to the data driving circuit 20 to provide a data signal Data. The display panel may also include a light emission control signal generation circuit 40 and corresponding enable signal lines (EM1-EMk). The light emission control signal generation circuit 40 generates the light emission control signal in the embodiment of the present invention. The display panel can be a display panel on a mobile phone, tablet, monitor, MP3, MP4, smartwatch, smart helmet, or other wearable device. Since it includes the pixel circuit provided in any embodiment of the present invention, it also has the same beneficial effects, which will not be described in detail here.

[0076] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A pixel circuit, characterized in that, The pixel circuit includes: The module includes a data writing module, a driving module, a light-emitting module, a storage module, a coupling module, and a voltage generation module. The data writing module is used to write data signals to the control terminal of the driving module, the driving module is used to generate driving current, the light-emitting module is used to display in response to the driving current, and the storage module is used to maintain the potential of the control terminal of the driving module. The voltage generation module is used to generate a feedback voltage based on the current flowing through the light-emitting module; The coupling module is used to couple the feedback voltage to the control terminal of the drive module; Wherein, when the driving module is not aged, the driving current generated by the driving module during the light emission stage at a preset gray level is the first driving current, and the voltage generation module generates a first feedback voltage based on the first driving current; after the driving module is aged, the driving current generated by the driving module at a preset gray level is the second driving current, and the voltage generation module generates a second feedback voltage based on the second driving current; the second feedback voltage is greater than the first feedback voltage. The voltage generation module includes: a first resistive element; a first end of the first resistive element is electrically connected to the light-emitting module, a first end of the first resistive element is electrically connected to the first end of the coupling module, and a second end of the first resistive element is connected to a first power supply voltage; the pixel circuit further includes a sensing module and a control module, the sensing module is used to sense the current flowing through the light-emitting module to generate a sensing current; the control module generates a control signal according to the sensing current; the first resistive element is an adjustable resistive element; the first resistive element is configured to adjust its resistance value according to the control signal; the pixel circuit further includes: a current replication module; the first resistive element is electrically connected to the light-emitting module through the current replication module, the current replication module is used to replicate the current flowing through the light-emitting module to the voltage generation module; wherein, the current replication module includes an input unit and an output unit, the input unit is used to input current, the output unit is used to output current, and the first resistive element is electrically connected to the output unit of the current replication module.

2. The pixel circuit according to claim 1, characterized in that, The first resistive element includes a first transistor, the first terminal of the first transistor serves as the first terminal of the first resistive element, the second terminal of the first transistor serves as the second terminal of the first resistive element, and the control terminal of the first transistor is electrically connected to the control module.

3. The pixel circuit according to claim 1, characterized in that, The current replication module includes a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a second resistive element; The input unit is the second transistor, and the control terminal of the second transistor is electrically connected to the first terminal of the second transistor. The first terminal of the third transistor is connected to the second power supply voltage, the second terminal of the third transistor is electrically connected to the first terminal of the fourth transistor, and the control terminal of the third transistor is electrically connected to the second terminal of the third transistor. The control terminal of the fourth transistor is electrically connected to the control terminal of the second transistor, and the second terminal of the fourth transistor is connected to the first power supply voltage; The first terminal of the fifth transistor is connected to the second power supply voltage, the second terminal of the fifth transistor is electrically connected to the first terminal of the second resistive element, and the control terminal of the fifth transistor is electrically connected to the control terminal of the third transistor. The output unit includes the fifth transistor and the second resistive element.

4. The pixel circuit according to claim 1, characterized in that, The first end of the data writing module is connected to the data signal, and the second end of the data writing module is electrically connected to the control end of the driving module. The control end of the data writing module is connected to the first scan signal. The first end of the storage module is connected to the second power supply voltage, and the second end of the storage module is electrically connected to the control end of the driving module. The first terminal of the driving module is connected to the second power supply voltage, and the second terminal of the driving module is electrically connected to the first terminal of the light-emitting module through the input unit of the current replication module. The second terminal of the light-emitting module is connected to the first power supply voltage. The first end of the coupling module is electrically connected to the first resistive element, and the second end of the coupling module is electrically connected to the control end of the drive module; The first end of the sensing module is electrically connected to the first end of the light-emitting module, the second end of the sensing module is electrically connected to the control module, and the control end of the sensing module receives a sensing scan signal.

5. The pixel circuit according to claim 1, characterized in that, The pixel circuit also includes a threshold compensation module, a first light emission control module, a second light emission control module, and an initialization module; The first end of the data writing module is connected to the data signal, the second end of the data writing module is electrically connected to the first end of the driving module, and the control end of the data writing module is connected to the second scan signal. The first terminal of the first light-emitting control module is connected to the second power supply voltage, the second terminal of the first light-emitting control module is electrically connected to the first terminal of the driving module, and the control terminal of the first light-emitting module is connected to the light-emitting control signal. The second end of the driving module is electrically connected to the first end of the second light-emitting control module, the first end of the storage module is connected to the second power supply voltage, and the second end of the storage module is electrically connected to the control end of the driving module. The first end of the threshold compensation module is electrically connected to the second end of the drive module, the second end of the threshold compensation module is electrically connected to the control end of the drive module, and the control end of the threshold compensation module is connected to the second scan signal; The first end of the second light-emitting control module is electrically connected to the second end of the driving module. The control end of the second light-emitting control module is connected to the light-emitting control signal. The second end of the second light-emitting control module is electrically connected to the first end of the light-emitting module through the input module of the current replication module. The second end of the light-emitting module is connected to the first power supply voltage. The first end of the coupling module is electrically connected to the first resistive element, and the second end of the coupling module is electrically connected to the control end of the drive module; The first terminal of the initialization module is connected to an initialization signal, the second terminal of the initialization module is electrically connected to the control terminal of the drive module, and the control terminal of the initialization module is connected to a third scan signal. The first end of the sensing module is electrically connected to the first end of the light-emitting module, the second end of the sensing module is electrically connected to the control module, and the control end of the sensing module receives a sensing scan signal.

6. The pixel circuit according to claim 1, characterized in that, The coupling module includes a first capacitor.

7. A display panel, characterized in that, The display panel includes a plurality of pixel circuits as described in any one of claims 1-6.

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