Pixel circuit, driving method thereof and light-emitting device

Abstract

The invention discloses a pixel circuit, a driving method thereof and a light-emitting device. The pixel circuit comprises a compensation module used for transmitting a first voltage to a control end of a driving module in an initialization stage and a threshold compensation stage; the first light-emitting control module is used for being switched on in an initialization stage, a threshold compensation stage and a light-emitting stage according to a first light-emitting control signal and switched off in a data writing stage; the second light-emitting control module is used for being turned off in the initialization stage according to a second light-emitting control signal and being turned on in the data writing stage, the threshold compensation stage and the light-emitting stage; and the first light-emitting control module and the second light-emitting control module are used for changing the potential of the second end of the storage module into the voltage associated with the threshold voltage of the driving module in the threshold compensation stage, and enabling the driving module to output the driving current in the light-emitting stage. According to the invention, the problem of uneven display image quality can be improved, the driving time sequence of the pixel circuit is simpler, and the control circuit corresponding to the pixel circuit is simpler.

Description

Technical Field

[0001] The present invention relates to the field of organic light emitting technology, and in particular to a pixel circuit, a driving method thereof, and a light emitting device. Background Art

[0002] Organic Light Emitting Diode (OLED) display panels have the characteristics of low power consumption, low production cost and self-luminescence, and have become a research hotspot in the current field.

[0003] Organic light-emitting diode (OLED) display panels emit light through current drive, so the characteristics of the driver device will affect the displayed grayscale brightness. When the characteristics of the driver devices corresponding to different LEDs vary greatly, uneven image quality is likely to occur. Summary of the Invention

[0004] The present invention provides a pixel circuit, a driving method thereof, and a light-emitting device to improve the problem of uneven display quality. The driving timing of the pixel circuit is simpler, and the control circuit corresponding to the pixel circuit is simpler.

[0005] According to one aspect of the present invention, there is provided a pixel circuit, comprising:

[0006] a compensation module, a driving module, a first light-emitting control module, a second light-emitting control module, and a storage module;

[0007] The first end of the compensation module is electrically connected to the control end of the driving module and the first end of the storage module;

[0008] The second end of the storage module is electrically connected to the second end of the second light emitting control module and the first end of the light emitting module; the first end of the second light emitting control module is electrically connected to the second end of the driving module, and the first end of the driving module is electrically connected to the second end of the first light emitting control module;

[0009] The control end of the first light control module is used to receive a first light control signal, and the control end of the second light control module is used to receive a second light control signal;

[0010] The first light emitting control module is configured to be turned on during the initialization phase, the threshold compensation phase, and the light emitting phase according to the first light emitting control signal, and to be turned off during the data writing phase;

[0011] The second light emitting control module is configured to be turned off in the initialization phase according to the second light emitting control signal, and turned on in the data writing phase, the threshold compensation phase, and the light emitting phase;

[0012] The first light emitting control module and the second light emitting control module are used to change the potential of the second end of the storage module to a voltage associated with the threshold voltage of the driving module in the threshold compensation stage, and to enable the driving module to output a driving current in the light emitting stage.

[0013] Optionally, the pixel circuit further includes:

[0014] a voltage stabilizing module and an initialization module, wherein a first end of the initialization module is electrically connected to a second end of the second light emitting control module, and the second end of the initialization module is used to receive a second voltage; and two ends of the voltage stabilizing module are electrically connected to a first end of the first light emitting control module and a second end of the second light emitting control module, respectively;

[0015] The initialization module is used to transmit the second voltage to the second end of the second light control module during the initialization phase;

[0016] The compensation module is used to transmit the first voltage to the control end of the driving module during the initialization phase and the threshold compensation phase, and transmit the data voltage to the control end of the driving module during the data writing phase after the threshold compensation phase.

[0017] Optionally, the compensation module includes a first transistor, a first end of the first transistor is electrically connected to the control end of the driving module, a second end of the first transistor is electrically connected to the data line, and the control end of the first transistor is used to receive a second scanning signal; the first transistor is used to be turned on in the initialization phase, the threshold compensation phase, and the data writing phase according to the second scanning signal, and turned off in the light-emitting phase;

[0018] The data line is used to transmit a first voltage to the first transistor in an initialization phase and a threshold compensation phase, and to transmit a data voltage to the first transistor in a data writing phase.

[0019] Optionally, the compensation module includes a first writing unit and a second writing unit;

[0020] The first end of the first writing unit and the first end of the second writing unit are both electrically connected to the control end of the driving module; the second end of the second writing unit is used to receive a first voltage, and the second end of the first writing unit is used to receive a data voltage;

[0021] The second writing unit is used to transmit the first voltage to the control terminal of the driving module during the initialization phase and the threshold compensation phase;

[0022] The first writing unit is used to transmit the data voltage to the control terminal of the driving module in a data writing phase after the threshold compensation phase.

[0023] Optionally, the first writing unit includes a second transistor, and the second writing unit includes a third transistor;

[0024] The first electrode of the second transistor and the first electrode of the third transistor are electrically connected to the control terminal of the driving module, the second electrode of the second transistor is electrically connected to the data line, the control terminal of the second transistor is used to receive a third scanning signal, the second electrode of the third transistor is electrically connected to the first signal line, and the control electrode of the third transistor is used to receive a fourth scanning signal;

[0025] The data line is used to transmit a data voltage to the second transistor; the first signal line is used to transmit a first voltage to the third transistor;

[0026] The second transistor is configured to be turned on in a data writing phase according to the third scanning signal, and the third transistor is configured to be turned on in an initialization phase and a threshold compensation phase according to the fourth scanning signal.

[0027] Optionally, the initialization module includes a fourth transistor, a first electrode of the fourth transistor is electrically connected to the second end of the second light emitting control module, the first electrode of the fourth transistor is used to receive the second voltage, and the control end of the fourth transistor is used to receive the first scanning signal;

[0028] The fourth transistor is configured to be turned on during the initialization phase according to the first scan signal.

[0029] Optionally, the driving module includes a driving transistor, the first light emitting control module includes a fifth transistor, and the second light emitting control module includes a sixth transistor;

[0030] The storage module includes a first capacitor, and the voltage stabilization module includes a second capacitor;

[0031] The first electrode of the driving transistor is electrically connected to the second electrode of the fifth transistor, the second electrode of the driving transistor is electrically connected to the first electrode of the sixth transistor, and the gate of the driving transistor is electrically connected to the first end of the compensation module;

[0032] The first electrode of the fifth transistor is used to receive a first power supply voltage, and the gate of the fifth transistor is used to receive a first light emitting control signal;

[0033] The second electrode of the sixth transistor is electrically connected to the light emitting module, and the gate of the sixth transistor is used to receive a second light emitting control signal.

[0034] According to another aspect of the present invention, a method for driving a pixel circuit is provided, the pixel circuit comprising: a compensation module, a driving module, a first light-emitting control module, a second light-emitting control module, and a storage module; a first end of the compensation module is electrically connected to a control end of the driving module and a first end of the storage module; a second end of the storage module is electrically connected to a second end of the second light-emitting control module and a first end of the light-emitting module; a first end of the second light-emitting control module is electrically connected to a second end of the driving module, and a first end of the driving module is electrically connected to a second end of the first light-emitting control module; the control end of the first light-emitting control module is configured to receive a first light-emitting control signal, and the control end of the second light-emitting control module is configured to receive a second light-emitting control signal; and the storage module is configured to store a voltage at the control end of the driving module and a voltage at the second end of the second light-emitting control module.

[0035] The driving method includes:

[0036] During the initialization phase, the compensation module is controlled to transmit the first voltage to the control terminal of the driving module, the first light-emitting control module is controlled to be turned on through the first light-emitting control signal, and the second light-emitting control module is controlled to be turned off through the second light-emitting control signal;

[0037] In the threshold compensation stage, the compensation module is controlled to transmit a first voltage to the control terminal of the driving module, the first light-emitting control module is controlled to be turned on by the first light-emitting control signal, and the second light-emitting control module is controlled to be turned on by the second light-emitting control signal, so that the potential of the second terminal of the storage module becomes a voltage associated with the threshold voltage of the driving module;

[0038] During the data writing phase, the compensation module is controlled to transmit the data voltage to the control terminal of the driving module, the first light-emitting control module is controlled to be turned off through the first light-emitting control signal, and the second light-emitting control module is controlled to be turned on through the second light-emitting control signal;

[0039] In the light-emitting stage, the first light-emitting control module is controlled to be turned on by the first light-emitting control signal, and the second light-emitting control module is controlled to be turned on by the second light-emitting control signal, so that the driving module outputs a driving current.

[0040] Optionally, the pixel circuit further includes an initialization module, a first end of the initialization module is electrically connected to the second end of the second light emitting control module, and the second end of the initialization module is used to receive a second voltage;

[0041] The driving method of the pixel circuit further includes:

[0042] During the initialization phase, controlling the initialization module to transmit the second voltage to the second terminal of the second light-emitting control module;

[0043] During the threshold compensation phase, the initialization module is controlled to be turned off:

[0044] During the data writing phase, controlling the initialization module to shut down;

[0045] During the light-emitting phase, the initialization module and the compensation module are controlled to be turned off.

[0046] According to another aspect of the present invention, a light-emitting device is provided, characterized in that it includes the pixel circuit described in any embodiment of the present invention.

[0047] The driving current output by the driving circuit of this embodiment is independent of the threshold voltage of the driving module, thus achieving threshold compensation, avoiding the influence of the characteristic difference of the driving module on the brightness of the light-emitting module, ensuring display uniformity, and improving the problem of uneven display quality. In addition, the second light-emitting control module is turned off in the initialization phase, so that the first light-emitting control module is turned on in the initialization phase without affecting the driving process. As a result, the first light-emitting control module is turned on in the initialization phase, the threshold compensation phase, and the light-emitting phase, and is turned off only in the data writing phase. The first light-emitting control signal corresponding to the first light-emitting control module has only one pulse in the data writing phase within a driving cycle. By setting the first light-emitting control module to be turned off in the data writing phase, the second light-emitting control module is turned on in the data writing phase without affecting the driving process. As a result, the second light-emitting control module can be turned off only in the initialization phase, and is turned on in the threshold compensation phase, the data writing phase, and the light-emitting phase. As a result, the second light-emitting control signal corresponding to the second light-emitting control module has only one pulse in the initialization phase within a driving cycle. As a result, the generation circuit of the first light-emitting control signal and the second light-emitting control signal, that is, the control current corresponding to the pixel circuit, is relatively simple and easy to implement.

[0048] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1This is a schematic diagram of a pixel circuit provided by an embodiment of the present invention.

[0051] Figure 2 yes Figure 1 Driving timing diagram of the pixel circuit.

[0052] Figure 3 This is a schematic diagram of a pixel circuit provided by an embodiment of the present invention.

[0053] Figure 4 This is a specific circuit diagram of a pixel circuit provided by an embodiment of the present invention.

[0054] Figure 5 This is a specific circuit diagram of another pixel circuit provided by an embodiment of the present invention.

[0055] Figure 6 yes Figure 4 Driving timing diagram of the pixel circuit.

[0056] Figure 7 This is a working diagram of the pixel circuit in the initialization stage.

[0057] Figure 8 This is a working diagram of the pixel circuit in the threshold compensation stage.

[0058] Figure 9 This is a working diagram of the pixel circuit during the data writing phase.

[0059] Figure 10 This is a working diagram of the pixel circuit in the light-emitting stage.

[0060] Figure 11 The present invention is a flowchart of a method for driving a display circuit. DETAILED DESCRIPTION

[0061] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0062] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0063] Figure 1 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention, Figure 2 yes Figure 1 The driving timing diagram of the pixel circuit is shown in Figure 2. Figure 1 and Figure 2 The driving process of the pixel circuit includes: in the initialization phase t1, transistors T2 and T3 are turned on, transistor T4 is turned off, the potential of the N1 node is Vref, and the potential of the N2 node is Vint; in the threshold compensation phase t2, transistors T2 and T4 are turned on, transistor T3 is turned off, the potential of the N1 node is maintained at Vref, and the potential of the N2 node is Vref-Vth, where Vth is the threshold voltage of the transistor T1; in the data writing phase t3, transistor T4 is turned off, and the potential of the N1 point is DATA. At this time, Vgs(T1)=DATA-(Vref-Vth), where Vgs(T1) is the voltage difference between the gate and source of the transistor T1;

[0064] In the light-emitting stage t4, the transistor T4 is turned on, the transistor T1 outputs the driving current, and the organic light-emitting diode emits light. I oled is the driving current, μ n 、C ox , W, L are the parameters of transistor T1, μ n is the electron mobility, C ox is the gate oxide capacitance per unit area, and W / L is the width-to-length ratio of the channel. Figure 2 The driver circuit output by the aforementioned pixel circuit achieves threshold compensation for the driving transistor, ensuring that the output driving current is solely dependent on the data voltage and the first voltage, thus preventing differences in the characteristics of the driving transistor from affecting the brightness of the organic light-emitting diode. However, the emission control signal EM that controls transistor T4 has two pulses per drive cycle, making the circuit for outputting EM (EOA circuit) complex and difficult to implement.

[0065] Based on this, an embodiment of the present invention provides a pixel circuit, Figure 3 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention, with reference to Figure 3 , the pixel circuit includes:

[0066] Compensation module 110, driving module 120, first light emitting control module 130, second light emitting control module 140 and storage module 150;

[0067] The first end of the compensation module 110 is electrically connected to the control end of the driving module 120 and the first end of the storage module 150;

[0068] The second end of the storage module 150 is electrically connected to the second end of the second light control module 140 and the first end of the light emitting module 170; the first end of the second light control module 140 is electrically connected to the second end of the driver module 120, and the first end of the driver module 120 is electrically connected to the second end of the first light control module 130;

[0069] The control terminal of the first light emitting control module 130 is used to receive the first light emitting control signal EM1, and the control terminal of the second light emitting control module 140 is used to receive the second light emitting control signal EM2;

[0070] The first light emitting control module 130 is configured to be turned on during the initialization phase, the threshold compensation phase, and the light emitting phase according to the first light emitting control signal EM1, and to be turned off during the data writing phase;

[0071] The second light emitting control module 140 is configured to be turned off in the initialization phase according to the second light emitting control signal EM2, and turned on in the data writing phase, the threshold compensation phase, and the light emitting phase;

[0072] The first light emitting control module 130 and the second light emitting control module 140 are used to change the potential of the second end of the storage module 150 to a voltage associated with the threshold voltage of the driving module 120 in the threshold compensation stage, and to enable the driving module 120 to output a driving current in the light emitting stage.

[0073] The storage module 150 is used to store the voltage at the control terminal of the driver module 120 and the voltage at the second terminal of the second light-emitting control module 140. The second terminal of the compensation module 110 is used to receive the first voltage Vref or the data voltage DATA, and the first terminal of the first light-emitting control module 130 is used to receive the first power supply voltage ELVDD. The compensation module 110 is used to transmit the first voltage Vref to the control terminal of the driver module 120 during the initialization phase and the threshold compensation phase, and to transmit the data voltage DATA to the control terminal of the driver module 120 during the data writing phase after the threshold compensation phase. The compensation module 110, the driver module 120, the first light-emitting control module 130, and the second light-emitting control module 140 can each include transistors, and the storage module 150 and the voltage stabilization module 160 can each include capacitors. The light-emitting module 170 can be an organic light-emitting diode, and the second terminal of the light-emitting module 170 is used to receive the second power supply voltage ELVSS.

[0074] During the initialization phase, the compensation module 110 and the first light-emitting control module 130 are turned on, and the compensation module 110 transmits the first voltage Vref to the control terminal of the driving module 120, so that the potential of the control terminal of the driving module 120 is the first voltage Vref. Since the second light-emitting control module 140 is turned off during the initialization phase, the turning on of the first light-emitting control module 130 during this phase will not affect the driving process of the pixel circuit.

[0075] During the threshold compensation stage, the compensation module 110, the first light-emitting control module 130, and the second light-emitting control module 140 are all turned on, causing the driver module 120 to be turned on. The compensation module 110 maintains the potential of the control terminal of the driver module 120 at Vref. The driver module 120 is turned on to charge the second terminal of the storage module 150, thereby causing the potential of the second terminal of the second light-emitting control module 140 (i.e., the second terminal of the storage module 150) to become Vref-Vth, where Vth is the threshold voltage of the driver module 120. When the potential difference between the control terminal and the second terminal of the driver module 120 is less than or equal to the threshold voltage, the driver module 120 is turned off.

[0076] During the data writing phase, the compensation module 110 continues to be turned on, the first light-emitting control module 130 and the second light-emitting control module 140 are turned off, and the compensation module 110 writes the data voltage DATA to the control end of the driving module 120. The potential of the control end of the driving module 120 becomes DATA, that is, the potential of the first end of the storage module 150 is DATA. Due to the presence of the voltage stabilizing module 160, the potential of the second end of the storage module 150 is maintained at Vref-Vth.

[0077] In the light-emitting stage, the compensation module 110 is turned off, the first light-emitting control module 130 and the second light-emitting control module 140 are turned on, so that the driving module 120 is turned on, and the driving module 120 outputs a driving current. The driving current is The driving current is independent of the threshold voltage of the driving module 120 , thus achieving threshold compensation and preventing the brightness of the light-emitting module 170 from being affected by the characteristic difference of the driving module 120 .

[0078] The driving current output by the driving circuit of this embodiment is independent of the threshold voltage of the driving module 120, thereby achieving threshold compensation, avoiding the influence of the characteristic difference of the driving module 120 on the brightness of the light-emitting module 170, ensuring display uniformity, and improving the problem of uneven display quality. Furthermore, the second light-emitting control module 140 is turned off during the initialization phase, so that turning on the first light-emitting control module 130 during the initialization phase will not affect the driving process. As a result, the first light-emitting control module 130 is turned on during the initialization phase, the threshold compensation phase, and the light-emitting phase, and is turned off only during the data writing phase. The first light-emitting control signal EM1 corresponding to the first light-emitting control module 130 has only one pulse during the data writing phase within a driving cycle. By setting the first light-emitting control module 130 to be turned off during the data writing phase, turning on the second light-emitting control module 140 during the data writing phase will not affect the driving process. As a result, the second light-emitting control module 140 can be turned off only during the initialization phase, and is turned on during the threshold compensation phase, the data writing phase, and the light-emitting phase. As a result, the second light-emitting control signal EM2 corresponding to the second light-emitting control module 140 has only one pulse during the initialization phase within a driving cycle. As a result, the circuit for generating the first light-emitting control signal EM1 and the second light-emitting control signal EM2, that is, the control circuit corresponding to the pixel circuit, is relatively simple and easier to implement.

[0079] On the basis of the above embodiment, optionally, continue to refer to Figure 3 , the pixel circuit further includes:

[0080] The voltage stabilizing module 160 and the initializing module 180 are configured such that a first terminal of the initializing module 180 is electrically connected to a second terminal of the second light emitting control module 140, and a second terminal of the initializing module 180 receives a second voltage Vint. Two ends of the voltage stabilizing module 160 are electrically connected to a first terminal of the first light emitting control module 130 and a second terminal of the second light emitting control module 140, respectively.

[0081] The initialization module 180 is configured to transmit the second voltage Vint to the second terminal of the second light emitting control module 140 during the initialization phase.

[0082] Specifically, in the data writing phase, the potential of the first terminal of the storage module 150 is DATA, and due to the existence of the voltage stabilizing module 160 , the potential of the second terminal of the storage module 150 is maintained at Vref−Vth.

[0083] By configuring the initialization module 180 to transmit the second voltage Vint to the second end of the second light-emitting control module 140 during the initialization phase, it is ensured that the potential difference between the control end and the second end of the driver module 120 during the threshold compensation phase is greater than the threshold voltage, thereby ensuring that the driver module 120 can be turned on during the threshold compensation phase, thereby changing the potential of the second end of the second light-emitting control module 140 to a voltage associated with the threshold voltage of the driver module 120, thereby achieving threshold compensation; and the charging speed of the second end of the second light-emitting control module 140 during the threshold compensation phase can be increased, so that its potential can be quickly changed to a voltage associated with the threshold voltage of the driver module 120, thereby improving the compensation speed.

[0084] Based on the above embodiment, optionally, Figure 4 This is a specific circuit diagram of a pixel circuit provided by an embodiment of the present invention, refer to Figure 4 The compensation module includes a first transistor T2, a first end of the first transistor T2 is electrically connected to the control end of the driving module 120, a second end of the first transistor T2 is electrically connected to the data line, and the control end of the first transistor T2 is used to receive the second scan signal SCAN2;

[0085] The first transistor T2 is used to be turned on in the initialization stage, the threshold compensation stage and the data writing stage according to the second scan signal SCAN2, and to be turned off in the light-emitting stage; the data line is used to transmit the first voltage Vref to the first transistor T2 in the initialization stage and the threshold compensation stage, and to transmit the data voltage DATA to the first transistor in the data writing stage.

[0086] Specifically, the data line outputs the first voltage Vref and the data voltage DATA to the first transistor T2 in a time-sharing manner, thereby implementing time-sharing writing of the first voltage Vref and the data voltage DATA, reducing the number of transistors in the pixel circuit and reducing the size of the pixel circuit.

[0087] Based on the above embodiment, optionally, Figure 5 This is a specific circuit diagram of another pixel circuit provided by an embodiment of the present invention, refer to Figure 3 and Figure 5 , the compensation module 110 includes a first writing unit 111 and a second writing unit 112;

[0088] The first end of the first writing unit 111 and the first end of the second writing unit 112 are both electrically connected to the control end of the driving module 120; the second end of the second writing unit 112 is used to receive the first voltage Vref, and the second end of the first writing unit 111 is used to receive the data voltage DATA;

[0089] The second writing unit 112 is used to transmit the first voltage Vref to the control terminal of the driving module 120 during the initialization phase and the threshold compensation phase;

[0090] The first writing unit 111 is used to transmit the data voltage DATA to the control terminal of the driving module 120 in the data writing phase after the threshold compensation phase.

[0091] Specifically, the driver chip is used to provide the data voltage DATA and the first voltage Vref to the pixel circuit. One port of the driver chip can be connected to the first write unit 111 through a data line, and the other port is connected to the second write unit 112 through a first signal line. That is, the driver chip outputs the data voltage DATA and the first voltage Vref through the two ports respectively, which reduces the difficulty of selecting the driver chip and reduces the cost of the driver chip.

[0092] Based on the above embodiment, optionally, refer to Figure 3 and Figure 5 , the first writing unit 111 includes a second transistor T2 ′, and the second writing unit 112 includes a third transistor T6;

[0093] A first electrode of the second transistor T2′ and a first electrode of the third transistor T6 are electrically connected to the control terminal of the driving module 120, a second electrode of the second transistor T2′ is electrically connected to the data line, the control terminal of the second transistor T2′ is used to receive the third scan signal SCAN3, a second electrode of the third transistor T6 is electrically connected to the first signal line, and the control terminal of the third transistor T6 is used to receive the fourth scan signal SCAN4;

[0094] The data line is used to transmit a data voltage to the second transistor T2 ′; the first signal line is used to transmit a first voltage Vref to the third transistor;

[0095] The second transistor T2 ′ is configured to be turned on in the data writing phase according to the third scan signal SCAN3 , and the third transistor T6 is configured to be turned on in the initialization phase and the threshold compensation phase according to the fourth scan signal SCAN4 .

[0096] Specifically, the second transistor T2′ is turned on during the data writing phase and turned off during other phases. After being turned on during the data writing phase, the data voltage DATA is written to the control terminal of the driving module 120. The third transistor T6 is turned on during the initialization phase and the threshold compensation phase and turned off during other phases. During the initialization phase and the threshold compensation phase, the first voltage Vref is written to the control terminal of the driving module 120.

[0097] By setting the compensation module 110 to include two transistors, the two transistors transmit the data voltage and the first voltage respectively, so that both transistors can be controlled to be turned on and off using a relatively simple scan signal, thereby reducing the difficulty of implementing the scan drive circuit (GOA circuit), reducing the difficulty of selecting the driver chip, and reducing the cost of the driver chip.

[0098] Based on the above embodiment, optionally, refer to Figure 4 and Figure 5 The initialization module 180 includes a fourth transistor T3, a first electrode of the fourth transistor T3 is electrically connected to the second end of the second light emitting control module 140, the first electrode of the fourth transistor T3 is used to receive the second voltage Vint, and the control end of the fourth transistor T3 is used to receive the first scan signal SCAN1;

[0099] The fourth transistor T3 is configured to be turned on in an initialization phase according to the first scan signal SCAN1 .

[0100] Specifically, the fourth transistor T3 is turned on only in the initialization phase, and the first scan signal SCAN1 has only one pulse in the initialization phase within one driving cycle. The signal is relatively simple, thereby reducing the difficulty of implementing the scan driving circuit (GOA circuit).

[0101] Based on the above embodiment, optionally, refer to Figure 3-Figure 5 The driving module includes a driving transistor T1 , the first light emitting control module 130 includes a fifth transistor T4 , and the second light emitting control module 140 includes a sixth transistor T5 ; the storage module 150 includes a first capacitor C1 , and the voltage stabilizing module 160 includes a second capacitor C2 .

[0102] The first electrode D of the driving transistor T1 is electrically connected to the second electrode of the fifth transistor T4, the second electrode S of the driving transistor T1 is electrically connected to the first electrode of the sixth transistor T5, and the gate of the driving transistor T1 is electrically connected to the first end of the compensation module 110;

[0103] A first electrode of the fifth transistor T4 is used to receive a first power supply voltage ELVDD, and a gate of the fifth transistor T4 is used to receive a first light emitting control signal EM1;

[0104] A second electrode of the sixth transistor T5 is electrically connected to the light emitting module 170 , and a gate of the sixth transistor T5 is used to receive the second light emitting control signal EM2 .

[0105] Specifically, Figure 6 yes Figure 4 The driving timing diagram of the pixel circuit in Figure 7 This is a working diagram of the pixel circuit in the initialization phase, refer to Figure 4 、 Figure 6 and Figure 7 ,In the initialization phase t1, T2, T3 and T4 are turned on, T5 is turned off, the potential of the N1 node is Vref, and the potential of the N2 node is Vint. Figure 8 This is a working diagram of the pixel circuit in the threshold compensation stage, refer to Figure 6 and Figure 8 In the threshold compensation stage t2, T2, T4, and T5 are turned on, T3 is turned off, the potential of the N1 node is Vref, and the potential of the N2 node is Vref-Vth. Figure 9 This is a working diagram of the pixel circuit during the data writing phase. Figure 6 and Figure 9 In the data writing phase t3, T3 and T4 are closed, T2 and T5 are opened, and the potential at point N1 is DATA, Vgs(T1)=DATA-(Vref-Vth). Figure 10 This is a working diagram of the pixel circuit in the light-emitting stage, refer to Figure 6 and Figure 10 , light-emitting stage t4, T4, T5 are turned on, T2, T3 are turned off, and T1 outputs driving current

[0106] Combine Figure 6 As can be seen, in this embodiment, each scan signal and light-emission control signal is a single pulse, making the circuits for outputting the scan signal (GOA circuit) and the circuits for outputting the light-emission control signal (EOA circuit) simpler and less expensive. For example, the EOA circuit can be reduced by an estimated one to two transistors.

[0107] The embodiment of the present invention further provides a driving method for a pixel circuit. Figure 11 This is a flow chart of a method for driving a display circuit provided by the present invention. Figure 3 and Figure 11The pixel circuit includes: a compensation module 110, a driving module 120, a first light-emitting control module 130, a second light-emitting control module 140, a storage module 150 and a voltage stabilizing module 160; a first end of the compensation module 110 is electrically connected to the control end of the driving module 120 and the first end of the storage module 150; a second end of the storage module 150 is electrically connected to the second end of the second light-emitting control module 140 and the first end of the light-emitting module 170; a first end of the second light-emitting control module 140 is electrically connected to the second end of the driving module 120, and a first end of the driving module 120 is electrically connected to the second end of the first light-emitting control module 130; the control end of the first light-emitting control module 130 is used to receive a first light-emitting control signal EM1, and the control end of the second light-emitting control module 140 is used to receive a second light-emitting control signal EM2;

[0108] Drive methods include:

[0109] S210, in the initialization phase, controlling the compensation module to transmit the first voltage to the control terminal of the driving module, controlling the first light-emitting control module to be turned on through a first light-emitting control signal, and controlling the second light-emitting control module to be turned off through a second light-emitting control signal;

[0110] S220: In the threshold compensation stage, the control compensation module transmits the first voltage to the control terminal of the driving module, controls the first light-emitting control module to be turned on through a first light-emitting control signal, and controls the second light-emitting control module to be turned on through a second light-emitting control signal, so that the potential of the second terminal of the storage module becomes a voltage associated with the threshold voltage of the driving module;

[0111] S230, in the data writing phase, controlling the compensation module to transmit the data voltage to the control terminal of the driving module, controlling the first light-emitting control module to be turned off through the first light-emitting control signal, and controlling the second light-emitting control module to be turned on through the second light-emitting control signal;

[0112] S240 , in the light-emitting stage, controlling the first light-emitting control module to be turned on by the first light-emitting control signal, and controlling the second light-emitting control module to be turned on by the second light-emitting control signal, so that the driving module outputs a driving current.

[0113] The storage module 150 is used to store the voltage of the control terminal of the driving module 120 and the voltage of the second terminal of the second light emitting control module 140 .

[0114] Optionally, the pixel circuit further includes a voltage stabilizing module 160 , and two ends of the voltage stabilizing module 160 are electrically connected to a first end of the first light emitting control module 130 and a second end of the second light emitting control module 140 , respectively.

[0115] Based on the above embodiment, optionally, the pixel circuit further includes an initialization module, a first end of the initialization module is electrically connected to the second end of the second light emitting control module, and the second end of the initialization module is used to receive the second voltage;

[0116] The driving method also includes:

[0117] In the initialization phase, the control initialization module transmits the second voltage to the second end of the second light emitting control module;

[0118] During the threshold compensation phase, the control initialization module is turned off:

[0119] During the data writing phase, the control initialization module is turned off;

[0120] During the light-emitting stage, the initialization module and the compensation module are controlled to be turned off.

[0121] The driving method of the pixel circuit provided in the embodiment of the present invention belongs to the same inventive concept as the pixel circuit provided in any embodiment of the present invention and has corresponding beneficial effects. For technical details not detailed in this embodiment, please refer to the pixel circuit described in any embodiment of the present invention.

[0122] An embodiment of the present invention further provides a light-emitting device, comprising the pixel circuit described in any embodiment of the present invention.

[0123] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0124] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A pixel circuit, characterized in that: include: a compensation module, a driving module, a first light-emitting control module, a second light-emitting control module, and a storage module; The first end of the compensation module is electrically connected to the control end of the driving module and the first end of the storage module; the second end of the storage module is electrically connected to the second end of the second light-emitting control module and the first end of the light-emitting module; the first end of the second light-emitting control module is electrically connected to the second end of the driving module, and the first end of the driving module is electrically connected to the second end of the first light-emitting control module; The control end of the first light control module is used to receive a first light control signal, and the control end of the second light control module is used to receive a second light control signal; The first light emitting control module is configured to be turned on during the initialization phase, the threshold compensation phase, and the light emitting phase according to the first light emitting control signal, and to be turned off during the data writing phase; The second light emitting control module is configured to be turned off in the initialization phase according to the second light emitting control signal, and turned on in the data writing phase, the threshold compensation phase, and the light emitting phase; The first light emitting control module and the second light emitting control module are used to change the potential of the second end of the storage module to a voltage associated with the threshold voltage of the driving module in the threshold compensation stage, and to enable the driving module to output a driving current in the light emitting stage.

2. The pixel circuit according to claim 1, wherein: Also includes: a voltage stabilizing module and an initialization module, wherein a first end of the initialization module is electrically connected to a second end of the second light emitting control module, and the second end of the initialization module is used to receive a second voltage; and two ends of the voltage stabilizing module are electrically connected to a first end of the first light emitting control module and a second end of the second light emitting control module, respectively; The initialization module is used to transmit the second voltage to the second end of the second light control module during the initialization phase; The compensation module is used to transmit the first voltage to the control end of the driving module during the initialization phase and the threshold compensation phase, and transmit the data voltage to the control end of the driving module during the data writing phase after the threshold compensation phase.

3. The pixel circuit according to claim 1, wherein: The compensation module includes a first transistor, a first end of the first transistor is electrically connected to the control end of the driving module, a second end of the first transistor is electrically connected to the data line, and the control end of the first transistor is used to receive a second scanning signal; The first transistor is configured to be turned on during the initialization phase, the threshold compensation phase, and the data writing phase according to the second scanning signal, and to be turned off during the light emitting phase; The data line is used to transmit a first voltage to the first transistor in an initialization phase and a threshold compensation phase, and to transmit a data voltage to the first transistor in a data writing phase.

4. The pixel circuit according to claim 1, wherein: The compensation module includes a first writing unit and a second writing unit; The first end of the first writing unit and the first end of the second writing unit are both electrically connected to the control end of the driving module; the second end of the second writing unit is used to receive a first voltage, and the second end of the first writing unit is used to receive a data voltage; The second writing unit is used to transmit the first voltage to the control terminal of the driving module during the initialization phase and the threshold compensation phase; The first writing unit is used to transmit the data voltage to the control terminal of the driving module in a data writing phase after the threshold compensation phase.

5. The pixel circuit according to claim 4, wherein: The first writing unit includes a second transistor, and the second writing unit includes a third transistor; The first electrode of the second transistor and the first electrode of the third transistor are electrically connected to the control terminal of the driving module, the second electrode of the second transistor is electrically connected to the data line, the control terminal of the second transistor is used to receive a third scanning signal, the second electrode of the third transistor is electrically connected to the first signal line, and the control electrode of the third transistor is used to receive a fourth scanning signal; The data line is used to transmit a data voltage to the second transistor; the first signal line is used to transmit a first voltage to the third transistor; The second transistor is configured to be turned on in a data writing phase according to the third scanning signal, and the third transistor is configured to be turned on in an initialization phase and a threshold compensation phase according to the fourth scanning signal.

6. The pixel circuit according to claim 2, wherein: The initialization module includes a fourth transistor, a first electrode of the fourth transistor is electrically connected to the second end of the second light emitting control module, the first electrode of the fourth transistor is used to receive the second voltage, and the control end of the fourth transistor is used to receive the first scanning signal; The fourth transistor is configured to be turned on during the initialization phase according to the first scan signal.

7. The pixel circuit according to claim 2, wherein: The driving module includes a driving transistor, the first light emitting control module includes a fifth transistor, and the second light emitting control module includes a sixth transistor; the storage module includes a first capacitor, and the voltage stabilizing module includes a second capacitor; The first electrode of the driving transistor is electrically connected to the second electrode of the fifth transistor, the second electrode of the driving transistor is electrically connected to the first electrode of the sixth transistor, and the gate of the driving transistor is electrically connected to the first end of the compensation module; The first electrode of the fifth transistor is used to receive a first power supply voltage, and the gate of the fifth transistor is used to receive a first light emitting control signal; The second electrode of the sixth transistor is electrically connected to the light emitting module, and the gate of the sixth transistor is used to receive a second light emitting control signal.

8. A method for driving a pixel circuit, characterized in that: The pixel circuit includes: a compensation module, a driving module, a first light-emitting control module, a second light-emitting control module, and a storage module; a first end of the compensation module is electrically connected to a control end of the driving module and a first end of the storage module; a second end of the storage module is electrically connected to a second end of the second light-emitting control module and a first end of the light-emitting module; a first end of the second light-emitting control module is electrically connected to a second end of the driving module, and a first end of the driving module is electrically connected to a second end of the first light-emitting control module; the control end of the first light-emitting control module is used to receive a first light-emitting control signal, and the control end of the second light-emitting control module is used to receive a second light-emitting control signal; and the driving method includes: During the initialization phase, the compensation module is controlled to transmit the first voltage to the control terminal of the driving module, the first light-emitting control module is controlled to be turned on through the first light-emitting control signal, and the second light-emitting control module is controlled to be turned off through the second light-emitting control signal; In the threshold compensation stage, the compensation module is controlled to transmit a first voltage to the control terminal of the driving module, the first light-emitting control module is controlled to be turned on by the first light-emitting control signal, and the second light-emitting control module is controlled to be turned on by the second light-emitting control signal, so that the potential of the second terminal of the storage module becomes a voltage associated with the threshold voltage of the driving module; During the data writing phase, the compensation module is controlled to transmit the data voltage to the control terminal of the driving module, the first light-emitting control module is controlled to be turned off through the first light-emitting control signal, and the second light-emitting control module is controlled to be turned on through the second light-emitting control signal; In the light-emitting stage, the first light-emitting control module is controlled to be turned on by the first light-emitting control signal, and the second light-emitting control module is controlled to be turned on by the second light-emitting control signal, so that the driving module outputs a driving current.

9. The driving method of the pixel circuit according to claim 8, wherein: The pixel circuit further includes an initialization module, a first terminal of the initialization module is electrically connected to a second terminal of the second light emitting control module, and the second terminal of the initialization module is used to receive a second voltage; The driving method of the pixel circuit further includes: During the initialization phase, controlling the initialization module to transmit the second voltage to the second terminal of the second light-emitting control module; During the threshold compensation phase, the initialization module is controlled to be turned off: During the data writing phase, controlling the initialization module to shut down; During the light-emitting phase, the initialization module and the compensation module are controlled to be turned off.

10. A light emitting device, characterized in that: The pixel circuit comprises the pixel circuit according to any one of claims 1 to 7.

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