Pixel circuit and driving method thereof, and display panel

Abstract

The embodiment of the present invention discloses a pixel circuit and a driving method thereof, and a display panel. The pixel circuit includes a latch module, and the latch module is electrically connected to the first end of the light-emitting module. The latch module outputs a first voltage to make the light-emitting module emit light or a second voltage to make the light-emitting module not emit light to the first end of the light-emitting module in the second light-emitting stage according to the size of the input data voltage in the second display mode, that is, the light-emitting state of the light-emitting module is controlled by the latch module in the second display mode. Due to the latching of the latch module itself, when the picture does not need to be changed, after inputting the data voltage to the latch module once, the latch module can output the first voltage or the second voltage for a long time, so that the display panel can keep the same static picture unchanged for a long time, then in the second display mode, both the data writing module and the driving module can be turned off, and the frequency of the data voltage output by the driving chip is reduced, thereby reducing the power consumption of the display device.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technology, and in particular to a pixel circuit and a driving method thereof, and a display panel. Background Art

[0002] With the development of display technology, organic light emitting display devices are increasingly used.

[0003] When an organic light emitting display device is performing display, according to the use requirements of the user, in some cases it is necessary to display a constantly changing dynamic picture, and in some cases it is necessary to display the same static picture for a long time.

[0004] However, existing organic light emitting display devices have the problem of high power consumption. Summary of the invention

[0005] The present invention provides a pixel circuit and a driving method thereof, and a display panel, so as to reduce the power consumption of the display panel.

[0006] In a first aspect, an embodiment of the present invention provides a pixel circuit, comprising: a data writing module, a driving module, a light emitting module and a latch module;

[0007] The data writing module is used for writing a data voltage to the control terminal of the driving module in the data writing phase in the first display mode;

[0008] The driving module and the light-emitting module are connected in series between the first power line and the second power line, and the driving module is used to output a driving current to the light-emitting module according to the voltage of its control terminal in the first light-emitting stage in the first display mode;

[0009] The latch module is electrically connected to the first end of the light-emitting module, and is used to output a first voltage or a second voltage to the first end of the light-emitting module in the second light-emitting stage according to the size of the input data voltage in the second display mode, wherein the first voltage is a voltage that makes the light-emitting module emit light, and the second voltage is a voltage that makes the light-emitting module not emit light; the second end of the light-emitting module is connected to the second power line.

[0010] Optionally, the latch module is further used to output a second voltage to the first end of the light emitting module in the first initialization phase according to the input set voltage in the first display mode;

[0011] Optionally, the picture switching frequency in the first display mode is greater than the picture switching frequency in the second display mode.

[0012] Optionally, the latch module includes a latch unit, an input control unit and an output control unit; the input end of the latch unit is electrically connected to the data line through the input control unit, and the output end of the latch unit is electrically connected to the first end of the light emitting module through the output control unit;

[0013] The input control unit is used to transmit the input setting voltage to the input end of the latch unit in the first latch writing stage, so that the latch unit latches and outputs the second voltage according to the setting voltage; the output control unit is used to transmit the second voltage to the first end of the light emitting module in the first initialization stage; wherein the first latch writing stage is the latch writing stage in the first display mode;

[0014] And / or, the input control unit is used to transmit the data voltage to the input end of the latch unit in the second latch write phase, so that the latch unit is used to latch and output the first voltage or the second voltage according to the size of the data voltage; the output control unit is used to transmit the first voltage or the second voltage to the first end of the light-emitting module in the second light-emitting phase; wherein the second latch write phase is the latch write phase in the second display mode.

[0015] Optionally, the first latch write phase includes a power-on phase and a start period when the second display mode switches to the first display mode; and / or, the second latch write phase includes a start period when the first display mode switches to the second display mode; and a phase of switching between different display screens in the second display mode.

[0016] Optionally, the control end of the input control unit is connected to the first control signal line, the first end of the input control unit is connected to the data line, and the second end of the input control unit is connected to the input end of the latch unit; the control end of the output control unit is connected to the second control signal line, the first end of the output control unit is connected to the output end of the latch unit, and the second end of the output control unit is connected to the first end of the light emitting module;

[0017] Optionally, the control end of the data writing module is connected to the first scan line, the first end of the data writing module is connected to the data line, and the second end of the data writing module is connected to the first end of the driving module;

[0018] The pixel circuit further includes a compensation module, a control end of the compensation module is connected to the compensation control signal line, a first end of the compensation module is connected to the second end of the driving module, and a second end of the compensation module is connected to the control end of the driving module;

[0019] The pixel circuit also includes a first light-emitting control module and a second light-emitting control module. The first light-emitting control module, the driving module, the second light-emitting control module, and the light-emitting module are connected in series between the first power line and the second power line.

[0020] Optionally, the latch unit includes a first transistor, a second transistor, a third transistor and a fourth transistor;

[0021] The gate of the first transistor is electrically connected to the input terminal of the latch unit, the first electrode of the first transistor is connected to the first voltage, the second electrode of the first transistor is electrically connected to the first electrode of the second transistor, the gate of the second transistor is electrically connected to the input terminal of the latch unit, and the second electrode of the second transistor is connected to the second voltage;

[0022] The gate of the third transistor is electrically connected to the output end of the latch unit, the first electrode of the third transistor is connected to the first voltage, the second electrode of the third transistor is electrically connected to the first electrode of the fourth transistor, the gate of the fourth transistor is electrically connected to the output end of the latch unit, and the second electrode of the latch unit is connected to the second voltage;

[0023] The gate of the first transistor, the gate of the second transistor and the second electrode of the third transistor are electrically connected; the gate of the third transistor, the gate of the fourth transistor and the second electrode of the first transistor are electrically connected;

[0024] The first transistor and the third transistor have the same channel type, and the second transistor and the fourth transistor have the same channel type.

[0025] Optionally, the first voltage is equal to the voltage on the first power line;

[0026] And / or the pixel circuit further includes an initialization module, a first end of the initialization module is connected to an initialization voltage, a second end of the initialization module is electrically connected to a control end of the driving module, and the initialization module is used to write the initialization voltage to the control end of the driving module in a first initialization phase; or the initialization module is used to write the initialization voltage to the control end of the driving module in a second initialization phase, wherein the second initialization phase is not performed simultaneously with the first initialization phase;

[0027] The second voltage is equal to the initialization voltage.

[0028] In a second aspect, an embodiment of the present invention further provides a method for driving a pixel circuit, comprising:

[0029] In the first display mode, the data writing module writes a data voltage to the control terminal of the driving module in the data writing phase; the driving module outputs a driving current to the light emitting module according to the voltage of its own control terminal in the first light emitting phase;

[0030] In the second display mode, the latch module outputs a first voltage or a second voltage to the first end of the light-emitting module in the second light-emitting stage according to the magnitude of the input data voltage, wherein the first voltage is a voltage for making the light-emitting module emit light, and the second voltage is a voltage for making the light-emitting module not emit light;

[0031] Optionally, the picture switching frequency in the first display mode is greater than the picture switching frequency in the second display mode;

[0032] Optionally, the driving method further includes: in the first display mode, the latch module outputs a second voltage to the first end of the light emitting module in a first initialization phase according to an input set voltage.

[0033] Optionally, the latch module includes a latch unit, an input control unit and an output control unit;

[0034] In the first display mode, the latch module outputs a second voltage to the first end of the light emitting module in a first initialization phase according to an input set voltage, including:

[0035] The input control unit transmits the input setting voltage to the input end of the latch unit in the first latch writing stage, so that the latch unit outputs the second voltage according to the setting voltage; the output control unit transmits the second voltage to the first end of the light emitting module in the first initialization stage;

[0036] And / or, in the second display mode, the latch module outputs the first voltage or the second voltage to the first end of the light emitting module in the second light emitting stage according to the magnitude of the input data voltage, including:

[0037] The input control unit transmits the data voltage to the input end of the latch unit in the second latch writing phase, so that the latch unit is used to latch and output the first voltage or the second voltage according to the size of the data voltage; the output control unit transmits the first voltage or the second voltage to the first end of the light emitting module in the second light emitting phase;

[0038] The first latch writing stage is the latch writing stage in the first display mode; the second latch writing stage is the latch writing stage in the second display mode;

[0039] Optionally, the driving method further includes:

[0040] In the second display mode, the light emitting brightness of the light emitting module is controlled by controlling the on-time of the output control unit.

[0041] In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel circuit of the first aspect;

[0042] And / or, comprising a plurality of pixel circuits and a plurality of latch modules, each latch module correspondingly connected to at least two pixel circuits, and the pixel circuit comprising a data writing module, a driving module and a light emitting module;

[0043] The latch module includes an input control unit, a latch unit, and an output control unit corresponding to a pixel circuit connected to the latch module. The input end of the latch unit is connected to a data line connected to a corresponding pixel circuit through the input control unit, and the output end of the latch unit is connected to a first end of a light-emitting module of a corresponding pixel circuit through the corresponding output control unit.

[0044] Among them, in the latch module, the control ends of different output control units are connected to different signal lines.

[0045] The pixel circuit and driving method thereof, and the display panel of the embodiment of the present invention are provided with a pixel circuit including a latch module, the latch module is electrically connected to the first end of the light-emitting module, and the latch module outputs a first voltage or a second voltage to the first end of the light-emitting module in the second light-emitting stage according to the size of the input data voltage in the second display mode, the first voltage is a voltage for making the light-emitting module emit light, and the second voltage is a voltage for making the light-emitting module not emit light, that is, in the second display mode, the light-emitting state of the light-emitting module is controlled by the latch module, and because of the latching of the latch module itself, when the picture does not need to be changed, after inputting the data voltage to the latch module once, the latch module can output the first voltage or the second voltage for a long time, so that the display panel can keep the same static picture unchanged for a long time, then in the second display mode, both the data writing module and the driving module can be turned off, and the frequency of the data voltage output by the driving chip is reduced, thereby reducing the power consumption of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a structural schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0047] Figure 2 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0048] Figure 3 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0049] Figure 4 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention in a first latch writing phase;

[0050] Figure 5 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention in a display stage in a first display mode;

[0051] Figure 6 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention in a second latch writing phase;

[0052] Figure 7 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention in a display stage in a second display mode;

[0053] Figure 8 is a flow chart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0054] Fig. 9 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0055] Fig.10 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0056] Fig.11 It is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0058] As described in the background technology, the existing organic light-emitting display device has the problem of high power consumption. The inventors have found that the reason for the above problem is that the existing organic light-emitting display device writes data to the pixel circuit in each frame according to the refresh frequency when driving the pixel circuit, whether it is for displaying a constantly changing dynamic picture or for displaying a static picture for a long time, that is, the display mode of the existing display panel is fixed, and the refresh frequency of the display picture is fixed. Even for the same static picture that needs to be displayed for a long time, the display picture is still refreshed in each frame, which makes the power consumption of the display panel high.

[0059] Based on the above problems, an embodiment of the present invention provides a pixel circuit. Figure 1 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention, with reference to Figure 1 , the pixel circuit includes: a data writing module 110, a driving module 120, a light emitting module 130 and a latch module 140;

[0060] The data writing module 110 is used to write a data voltage to the control terminal G1 of the driving module 120 during the data writing phase in the first display mode; the driving module 120 and the light-emitting module 130 are connected in series between the first power line VDD and the second power line VSS, and the driving module 120 is used to output a driving current to the light-emitting module 130 according to the voltage of its own control terminal during the first light-emitting phase in the first display mode; the latch module 140 is electrically connected to the first end of the light-emitting module 130, and is used to output a first voltage or a second voltage to the first end of the light-emitting module 130 during the second light-emitting phase in the second display mode according to the size of the input data voltage, the first voltage being a voltage that causes the light-emitting module 130 to emit light, and the second voltage being a voltage that causes the light-emitting module 130 to not emit light; the second end of the light-emitting module 130 is connected to the second power line VSS.

[0061] Specifically, the pixel circuit includes a data writing module 110 and a driving module 120. The data writing module 110 is directly or indirectly connected to the control terminal of the driving module 120, so that the data voltage can be written to the control terminal of the driving module 120. Figure 1 exemplarily shows the case where the data writing module 110 is directly connected to the control end of the driving module 120. In other optional embodiments of the present invention, the data writing module 110 is indirectly connected to the control end of the driving module 120. When the data writing module 110 is indirectly connected to the control end of the driving module 120, the pixel circuit may further include a compensation module 150. The data writing module 110 writes the data voltage to the control end of the driving module 120 through the driving module 120 and the compensation module 150. The pixel circuit further includes a latch module 140. The latch module 140 is electrically connected to the first end of the light emitting module 130, and can control the voltage of the first end of the latch light emitting module 130 according to the input voltage, thereby realizing the control of the light emitting state of the light emitting module 130.

[0062] Among them, the display mode of the display panel includes a first display mode and a second display mode. Optionally, the picture switching frequency in the first display mode is greater than the picture switching frequency in the second display mode. Specifically, the first display mode can be a conventional display mode, which is a mode in which a data voltage is written to the control end of the driving module 120 in each frame according to the refresh frequency, and the driving module 120 controls the light-emitting module 130 to emit light according to the data voltage. In the first display mode, each frame includes a data writing phase and a first light-emitting phase. In the data writing phase, the data writing module 110 writes a data voltage to the control end of the driving module 120; in the first light-emitting phase, the driving module 120 outputs a driving current to the light-emitting module 130 according to the data voltage of its own control end, and the light-emitting module 130 emits light. Optionally, the driving module 120 generates a driving current according to the voltage difference between its own control end and its own first end and outputs it to the light-emitting module 130. Among them, the first end of the driving module 120 is connected to the first power line VDD.

[0063] The second display mode can be a storage display mode. In the storage display mode, a data voltage is input to the latch module 140. In the second light-emitting stage, the latch module 140 outputs a first voltage or a second voltage to the first end of the light-emitting module 130 according to the size of the input data voltage, wherein the first voltage is a voltage for turning on the light-emitting module 130, and the second voltage is a voltage for turning off the light-emitting module 130, thereby controlling the light-emitting state of the light-emitting module 130. That is, in the second display mode, the output of the latch module 140 is controlled by the different data voltages input to the latch module 140, thereby controlling the light-emitting state of the light-emitting module 130. That is, in the second display mode, the data voltage is not written to the control end of the driving module 120 through the data writing module 110, but the voltage of the first end of the light-emitting module 130 is controlled through the latch module 140. Therefore, in the second display mode, it is not necessary to write the data voltage to the control end of the driving module 120 through the data writing module 110 in each frame, that is, the data writing module 110 and the driving module 120 can be controlled to be turned off, and the latch module 140 latches the output of the first voltage or the second voltage according to the size of the input data voltage, so that the data voltage input to the latch module 140 once can achieve a long-term maintenance of the display image, thereby reducing the power consumption of the display panel.

[0064] The pixel circuit of this embodiment is provided with a latch module, the latch module is electrically connected to the first end of the light emitting module, and the latch module outputs the first voltage to make the light emitting module emit light or the second voltage to make the light emitting module not emit light to the first end of the light emitting module in the second light emitting stage according to the magnitude of the input data voltage in the second display mode, that is, the light emitting state of the light emitting module is controlled by the latch module in the second display mode. Due to the latching of the latch module itself, when the picture does not need to be changed, after inputting the data voltage to the latch module once, the latch module can output the first voltage or the second voltage for a long time, so that the display panel can keep the same static picture unchanged for a long time, then in the second display mode, both the data writing module and the driving module can be turned off, and the frequency of the output of the data voltage by the driving chip is reduced, thereby reducing the power consumption of the display device.

[0065] On the basis of the above technical solution, optionally, the latch module 140 is further used to output a second voltage to the first end of the light emitting module 130 in the first initialization phase according to the input set voltage in the first display mode.

[0066] Specifically, in the first display mode, the operation process of the pixel circuit in one frame includes a first initialization phase, a data writing phase and a first light-emitting phase. The first initialization phase can be performed before the data writing phase or after the data writing phase; and the first initialization phase is performed before the first light-emitting phase.

[0067] In the first initialization stage, a set voltage is input to the latch module 140, and the latch module 140 outputs a second voltage to the light emitting module 130 according to the input set voltage, thereby making the light emitting module 130 unable to light up in the first initialization stage, thereby initializing the first end of the light emitting module 130.

[0068] Figure 2 is a schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2 Optionally, the latch module 140 includes a latch unit 141, an input control unit 142 and an output control unit 143; the input end of the latch unit 141 is electrically connected to the data line Data through the input control unit 142, and the output end of the latch unit 141 is electrically connected to the first end of the light emitting module 130 through the output control unit 143;

[0069] The input control unit 142 is used to transmit the input set voltage to the input end of the latch unit 141 in the first latch write phase, so that the latch unit 141 latches and outputs the second voltage according to the set voltage; the output control unit 143 is used to transmit the second voltage to the first end of the light-emitting module 130 in the first initialization phase; wherein the first latch write phase is the latch write phase before the first initialization phase in the first display mode.

[0070] And / or the input control unit 142 is used to transmit the data voltage to the input end of the latch unit 141 in the second latch writing stage, so that the latch unit 141 is used to latch and output the first voltage or the second voltage according to the size of the data voltage; the output control unit 143 is used to transmit the first voltage or the second voltage to the first end of the light-emitting module 130 in the second light-emitting stage; wherein the second latch writing stage is the latch writing stage in the second display mode.

[0071] Specifically, the data line Data is electrically connected to the output end of the driver chip, and the output end of the driver chip outputs a set voltage in the first latch writing stage of the first display stage, so the data line Data transmits the set voltage in the first latch writing stage; the output end of the driver chip outputs a data voltage in the data writing stage of the first display mode and the second latch writing stage of the second display mode, so the data line Data transmits a data voltage in the data writing stage and the second latch writing stage. According to the display screen, the data voltages in the data writing stage and the second latch writing stage can be the same or different, which is not specifically limited in this embodiment.

[0072] In the first latch write phase, a set voltage is input to the input end of the input control unit 142. In the first latch write phase, the input control unit 142 transmits the set voltage to the input end of the latch unit 141, so that the latch unit 141 latches and outputs the second voltage according to the set voltage. The first initialization phase is performed after the first latch write phase. In the first initialization phase, the output control unit 143 transmits the second voltage latched and output by the latch unit 141 to the first end of the light emitting module 130, so as to initialize the first end of the light emitting module 130.

[0073] In the second latch write phase, the input end of the input control unit 142 is input with a data voltage, and in the second latch write phase, the input control unit 142 transmits the data voltage to the input end of the latch unit 141, so that the latch unit 141 latches and outputs the first voltage or the second voltage according to the input voltage. The second light-emitting phase is performed after the second latch write phase, and in the second light-emitting phase, the output control unit 143 transmits the first voltage or the second voltage latched and output by the latch unit 141 to the first end of the light-emitting module 130 to control the light-emitting state of the light-emitting module 130.

[0074] Continue to refer Figure 2 Optionally, the control end of the input control unit 142 is connected to the first control signal line Ctrl1, the first end of the input control unit 142 is connected to the data line Data, and the second end of the input control unit 142 is connected to the input end of the latch unit 141; the control end of the output control unit 143 is connected to the second control signal line Ctrl2, the first end of the output control unit 143 is connected to the output end of the latch unit 141, and the second end of the output control unit 143 is connected to the first end of the light-emitting module 130.

[0075] exist Figure 2 In the embodiment shown, the first voltage is the power supply voltage provided by the first power supply line VDD, and the second voltage is the initialization voltage provided by the initialization signal line Vref, which can reduce wiring. Of course, the first voltage and the second voltage are not limited thereto, and can also be voltages provided by additional signal lines.

[0076] Specifically, in the first display mode, in the first latch writing stage, the first control signal line Ctrl1 transmits a valid level signal to the control end of the input control unit 142, and the data line Data transmits a set voltage to the first end of the input control unit 142, so that the input control unit 142 is turned on, and the set voltage is transmitted to the input end of the latch unit 141, so that the latch unit 141 outputs a second voltage; in the first initialization stage, the second control signal line Ctrl2 transmits a valid level signal to the control end of the output control unit 143, so that the output control unit 143 is turned on, and the second voltage output by the latch unit 141 is transmitted to the first end of the light-emitting module 130 by the output control unit 143, thereby initializing the first end of the light-emitting module 130.

[0077] In the second display mode, in the second latch writing stage, the first control signal line Ctrl1 transmits a valid level signal to the control end of the input control unit 142, and the data line Data transmits a data voltage to the first end of the input control unit 142, so that the input control unit 142 is turned on, and the data voltage is transmitted to the input end of the latch unit 141, so that the latch unit 141 outputs the first voltage or the second voltage; in the second light-emitting stage, the second control signal line Ctrl2 transmits a valid level signal to the control end of the output control unit 143, so that the output control unit 143 is turned on, and the first voltage or the second voltage output by the latch unit 141 is transmitted to the first end of the light-emitting module 130 by the output control unit 143, thereby realizing the control of the light-emitting state of the light-emitting module 130.

[0078] On the basis of the above technical solution, optionally, the first latch writing phase includes: a power-on phase, and / or a start period when the second display mode is switched to the first display mode.

[0079] Optionally, the second latch writing phase includes: a start period of switching from the first display mode to the second display mode, and / or a phase of switching between different display images in the second display mode.

[0080] Specifically, in this embodiment, during the power-on phase and the start period when the second display mode is switched to the first display mode, the input control unit 142 transmits the set voltage to the input end of the latch unit 141, so that the latch unit 141 latches the second voltage, so that after the power-on period and after the second display mode is switched to the first display mode, in each subsequent frame in the first display mode, the first initialization phase can realize initialization of the first end of the light-emitting module 130. That is, in this embodiment, after the first latch writing phase, the pixel circuit in the display panel refreshes the data voltage frame by frame, and the display panel displays frame by frame.

[0081] Since the second display mode is different from the first display mode, in the second display mode, the potential of the first end of the light emitting module 130 is controlled by the latch module 140 to realize the light emitting control of the light emitting module 130. Therefore, after the first display mode is switched to the second display mode, it is necessary to turn on the input control unit 142 to transmit the data voltage to the input end of the latch unit 141, so that the latch unit 141 latches the first voltage or the second voltage, so that when the output control unit 143 is turned on in the second light emitting stage of the second display stage, the latch unit 141 outputs the first voltage or the second voltage to the output end of the light emitting module 130, thereby realizing the control of the light emitting state of the light emitting module 130. In the second display mode, for the light-emitting module 130 in the same pixel circuit, the light-emitting state under different display pictures may be different. Therefore, when different display pictures are switched in the second display mode, the data voltage transmitted by the data line Data changes. Accordingly, the voltage latched by the latch unit 141 may need to change. For example, in the previous display picture, the latch unit 141 latches the first voltage to make the light-emitting module 130 emit light, and in the next display picture, the latch unit 141 latches the second voltage to make the light-emitting module 130 not emit light. Therefore, the second latch writing stage is set as the stage for switching between different display pictures in the second display mode to control the voltage latched by the latch unit 141, and then control the light-emitting state of the light-emitting module 130 in the second light-emitting stage to achieve the switching of the display pictures.

[0082] Figure 3 is a schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2 and Figure 3 , Optionally, the latch unit 141 includes a first transistor T1, a second transistor T2, a third transistor T3 and a fourth transistor T4;

[0083] The gate of the first transistor T1 is electrically connected to the input terminal of the latch unit 141, the first electrode of the first transistor T1 is connected to the first voltage, the second electrode of the first transistor T1 is electrically connected to the first electrode of the second transistor T2, the gate of the second transistor T2 is electrically connected to the input terminal of the latch unit 141, and the second electrode of the second transistor T2 is connected to the second voltage;

[0084] The gate of the third transistor T3 is electrically connected to the output end of the latch unit 141, the first electrode of the third transistor T3 is connected to the first voltage, the second electrode of the third transistor T3 is electrically connected to the first electrode of the fourth transistor T4, the gate of the fourth transistor T4 is electrically connected to the output end of the latch unit 141, and the second electrode of the latch unit 141 is connected to the second voltage;

[0085] The gate of the first transistor T1, the gate of the second transistor T2 and the second electrode of the third transistor T3 are electrically connected; the gate of the third transistor T3, the gate of the fourth transistor T4 and the second electrode of the first transistor T1 are electrically connected;

[0086] The first transistor T1 and the third transistor T3 have the same channel type, and the second transistor T2 and the fourth transistor T4 have the same channel type.

[0087] Optionally, the first transistor T1 and the third transistor T3 are both P-channel transistors, and the second transistor T2 and the fourth transistor T4 are both N-channel transistors. When the output end of the input control unit 142 transmits a set voltage to the latch unit 141, the first transistor T1 is turned off according to the set voltage at its own gate and the first voltage at the first pole, and the second transistor T2 is turned on according to the set voltage at its own gate and the second voltage at the first pole, and the second voltage is transmitted to the second pole of the second transistor T2, and then transmitted from the second pole of the second transistor T2 to the gate of the third transistor T3 and the gate of the fourth transistor T4, that is, the output end of the latch unit 141. At the same time, the third transistor T3 is turned on in response to the second voltage, and the first voltage is transmitted to the second pole of the third transistor T3, and the first voltage is transmitted from the second pole of the third transistor T3 to the gate of the first transistor T1 and the gate of the second transistor T2, thereby turning on the second transistor T2 to achieve the latching function of the latch unit 141.

[0088] When the output end of the input control unit 142 transmits the data voltage to the latch unit 141, when the data voltage is the black screen data voltage, the working process of the latch unit 141 is the same as the working process of the output end of the input control unit 142 transmitting the set voltage to the latch unit 141, which is not repeated here. That is, the set voltage can be equal to the black screen data voltage. When the data voltage is the white screen data voltage, the first transistor T1 is turned on according to the white screen data voltage at its own gate and the first voltage of the first electrode, and the first voltage is transmitted to the second electrode of the first transistor T1, and the second transistor T2 is turned off according to the white screen data voltage at its own gate and the second voltage of the first electrode, and the first voltage of the second electrode of the first transistor T1 is transmitted to the gate of the third transistor T3 and the gate of the fourth transistor T4, that is, the output end of the latch unit 141. At the same time, the fourth transistor T4 is turned on in response to the first voltage, and the second voltage is transmitted to the second electrode of the fourth transistor T4. The second voltage is transmitted from the second electrode of the fourth transistor T4 to the gate of the first transistor T1 and the gate of the second transistor T2, thereby turning on the first transistor T1 to realize the latching function of the latch unit 141.

[0089] It should be noted that the black screen data voltage and the white screen data voltage can be pre-set in the driving chip. Optionally, when the first transistor T1 and the third transistor T3 are P-type transistors, and the second transistor T2 and the fourth transistor T4 are N-type transistors, the black screen data voltage satisfies the condition that the difference between the black screen data voltage and the first voltage is greater than the threshold voltage of the first transistor T1, and the difference between the black screen data voltage and the dark state data voltage is greater than or equal to the threshold voltage of the second transistor T2; the white screen data voltage satisfies the condition that the difference between the white screen data voltage and the first voltage is less than or equal to the threshold voltage of the first transistor T1, and the difference between the black screen data voltage and the dark state data voltage is less than the threshold voltage of the second transistor T2.

[0090] Continue to refer Figure 2 and Figure 3 Optionally, the input control unit 142 includes a fifth transistor T5, the gate of the fifth transistor T5 serves as the control end of the input control unit 142, the first electrode of the fifth transistor T5 serves as the input end of the input control unit 142 and is connected to the data line Data, and the second electrode of the fifth transistor T5 serves as the output end of the input control unit 142 and is connected to the input end of the latch unit 141. The output control unit 143 includes a sixth transistor T6, the gate of the sixth transistor T6 serves as the control end of the output control unit 143, the first electrode of the sixth transistor T6 serves as the input end of the output control unit 143 and is connected to the output end of the latch unit 141, and the second electrode of the sixth transistor T6 serves as the output end of the output control unit 143 and is connected to the first end of the light emitting module 130.

[0091] Figure 2 and Figure 3 Two connection modes of the data writing module 110 are shown in FIG. Figure 2 Optionally, the data writing module 110 is directly connected to the control end of the driving module 120, the control end of the data writing module 110 is connected to the first scanning line Scan1, the first end of the data writing module 110 is connected to the data line Data, and the second end of the data writing module 110 is connected to the control end of the driving module 120.

[0092] refer to Figure 3 Optionally, the data writing module 110 is indirectly connected to the control end of the driving module 120, the control end of the data writing module 110 is connected to the first scanning line Scan1, the first end of the data writing module 110 is connected to the data line Data, and the second end of the data writing module 110 is connected to the first end of the driving module 120.

[0093] refer to Figure 3Optionally, the pixel circuit also includes a compensation module 150, the control end of the compensation module 150 is connected to the compensation control signal line Bctr, the first end of the compensation module 150 is connected to the second end of the driving module 120, and the second end of the compensation module 150 is connected to the control end of the driving module 120.

[0094] Specifically, in the first display mode, in the data writing stage, the signal on the first scan line Scan1 is a valid level signal, the data writing module 110 is turned on, and the data voltage is transmitted to the first end of the driving module 120. In the data writing stage, the signal on the compensation control signal line Bctr is a valid level signal, the compensation module 150 is turned on, and the data voltage is written to the control end of the driving module 120 through the driving module 120 and the compensation module 150, wherein the driving module 120 includes a driving transistor, and in the data writing stage, the threshold voltage of the driving transistor is compensated. In the second display mode, the signal on the first scan line Scan1 is an invalid level signal, the signal on the compensation control signal line Bctr is an invalid level signal, and the data writing module 110 and the compensation control module are both turned off.

[0095] The effective level signal on the first scan line Scan1 is a level signal effective to the data writing module 110, i.e., a level signal that turns on the data writing module 110; the level signal on the compensation control signal line Bctr is a level signal effective to the compensation module 150, i.e., a level signal that turns on the compensation module 150. When the types of transistors included in the data writing module 110 and the compensation module 150 are the same, the first scan line can be reused as the compensation control signal line.

[0096] Continue to refer Figure 3 The pixel circuit further includes a first light emitting control module 160 and a second light emitting control module 170. The first light emitting control module 160, the driving module 120, the second light emitting control module 170, and the light emitting module 130 are connected in series between the first power line VDD and the second power line VSS.

[0097] Specifically, the control end of the first light-emitting control module 160 and the control end of the second light-emitting control module 170 are connected to the light-emitting control signal line. In the first display mode, in the first initialization phase and the data writing phase, the light-emitting control signal line transmits an invalid level signal, and the first light-emitting control module 160 and the second light-emitting control module 170 are turned off. In the first light-emitting phase, the light-emitting control signal line transmits a valid level signal, the first light-emitting control module 160 and the second light-emitting control module 170 are turned on, and the driving module 120 drives the light-emitting module 130 to emit light. In the second display mode, the light-emitting control signal line transmits an invalid level signal to the first light-emitting control module 160 and the second light-emitting control module 170, and the first light-emitting control module 160 and the second light-emitting control module 170 are turned off.

[0098] Continue to refer Figure 3 The pixel circuit further includes an initialization module 180, a first end of the initialization module 180 is connected to the initialization voltage, a second end of the initialization module 180 is electrically connected to the control end of the driving module 120, and the initialization module 180 is used to write the initialization voltage to the control end of the driving module 120 in the first initialization stage; or, the initialization module 180 is used to write the initialization voltage to the control end of the driving module 120 in the second initialization stage, wherein the second initialization stage is not performed simultaneously with the first initialization stage; wherein the second voltage is equal to the initialization voltage. Optionally, the control end of the initialization module 180 is connected to the second scanning signal line, the first end of the initialization module 180 is connected to the initialization signal line Vref, and the second end of the initialization module 180 is connected to the control end of the driving module 120.

[0099] In an optional embodiment, in the first display mode, the operation process of the pixel circuit in one frame includes a first initialization phase, a data writing phase, and a first light-emitting phase performed sequentially. In another optional embodiment, in the first display mode, the operation process of the pixel circuit in one frame includes a second initialization phase, a first initialization phase, a data writing phase, and a first light-emitting phase.

[0100] In this embodiment, the second voltage is set equal to the initialization voltage, and the first electrode of the second transistor T2 and the first electrode of the fourth transistor T4 in the latch unit 141 are connected to the initialization signal line Vref that transmits the initialization voltage, so there is no need to additionally set a signal line for providing the second voltage in the display panel, so that the number of signal lines in the display panel is reduced, which is conducive to simplifying wiring.

[0101] It should be noted that in other optional embodiments of the present invention, the second voltage may not be equal to the initialization voltage. In this case, a signal line providing the second voltage is provided in the display panel and connected to the latch unit 141 .

[0102] Optionally, the first voltage is equal to the voltage on the first power line VDD, and the first transistor T1 and the third transistor T3 in the latch unit 141 can be directly connected to the first power line VDD, without setting a signal line for providing the first voltage in the display panel, so that the number of signal lines in the display panel is reduced, which is conducive to simplifying wiring.

[0103] Continue to refer Figure 2 and Figure 3 , the driving module 120 includes a driving transistor, and the data writing module 110 includes a seventh transistor T7. Figure 3, the compensation module 150 includes an eighth transistor T8, the first light emitting control module 160 includes a ninth transistor T9, and the second light emitting control module 170 includes a tenth transistor T10. Optionally, the compensation module 150 includes an eighth transistor T8 as an oxide transistor, so that the compensation module 150 has a smaller leakage current, so that the potential of the control terminal of the driving module 120 can be better maintained in the first light emitting stage. Figure 3 As shown, except for the eighth transistor T8, the remaining transistors are all P-type transistors. Optionally, the light emitting module 130 includes a light emitting device, which may be an organic light emitting device or an inorganic light emitting device. The storage module includes a storage capacitor Cst.

[0104] Figure 4 is a driving timing diagram of the pixel circuit provided by an embodiment of the present invention in the first latch writing stage, Figure 5 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention in a display stage in a first display mode, Figure 4 and Figure 5 The drive timing shown is for driving Figure 3 The pixel circuit shown.

[0105] refer to Figure 3 and Figure 4 In the first latch writing phase t01, the signals on the first scan line Scan1, the second scan line Scan2 and the light emitting control signal line are all high level Vgh, and accordingly, the seventh transistor T7, the eleventh transistor T11, the ninth transistor T9 and the tenth transistor T10 are all turned off; the signal on the compensation control signal line Bctr is low level Vgl, and the compensation module 150 is also turned off. The data line Data transmits a setting voltage to the first electrode of the fifth transistor T5, wherein the setting voltage is a high level Vgh, and the first control signal line Ctrl1 inputs a valid level signal to the gate of the fifth transistor T5, so that the fifth transistor T5 is turned on, and the setting voltage is transmitted to the input end of the latch unit 141, so that the latch unit 141 outputs a second voltage (i.e., the initialization voltage on the initialization signal line Vref) to the sixth transistor T6 according to the setting voltage.

[0106] The display stage in the first display mode is recorded as the first display stage, referring to Figure 3 and Figure 5 In the first initialization stage t1, the signal on the second scan line Scan2 is at a low level Vgl, the eleventh transistor T11 is turned on, and the initialization voltage is transmitted to the gate of the driving transistor to initialize the gate of the driving transistor.

[0107] In the second initialization stage t2, the signal of the second control signal line Ctrl2 is at a low level Vgl, so that the sixth transistor T6 is turned on, and the second voltage (i.e., the initialization voltage on the initialization signal line Vref) is transmitted to the anode of the light-emitting device, so that the light-emitting device does not emit light, thereby initializing the anode of the light-emitting device.

[0108] In the data writing stage t3, the signal on the first scan line Scan1 is a low level Vgl, the seventh transistor T7 is turned on, the signal on the compensation control signal line Bctr is a low level Vgl, the eighth transistor T8 is turned on, and the data voltage is written to the gate of the driving transistor through the seventh transistor T7, the driving transistor and the eighth transistor T8, thereby realizing data writing to the gate of the driving transistor and compensating the threshold voltage of the driving transistor.

[0109] In the first light emitting stage t4, the signal on the light emitting control signal line is at a low level Vgl, the ninth transistor T9 and the tenth transistor T10 are turned on, and the driving transistor drives the light emitting device to emit light.

[0110] It should be noted that Figure 5 Taking the first display stage, the working process of the pixel circuit within a frame includes the first initialization stage t1, the second initialization stage t2, the data writing stage t3 and the first light-emitting stage t4 as an example. When the working process of the pixel circuit within a frame includes the first initialization stage t1, the data writing stage t3 and the first light-emitting stage t4, the low-level Vgl signal on the second control signal line Ctrl2 coincides with the low-level Vgl signal on the second scan line Scan2.

[0111] Figure 6 is a driving timing diagram of the pixel circuit provided by an embodiment of the present invention in the second latch writing phase, Figure 7 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention in a display stage in a second display mode, Figure 6 and Figure 7 The drive timing shown is for driving Figure 3 The pixel circuit shown.

[0112] refer to Figure 3 and Figure 6In the second latch writing stage t02, the signals on the first scan line Scan1, the second scan line Scan2 and the light emitting control signal line are all high level Vgh, and accordingly, the seventh transistor T7, the eleventh transistor T11, the ninth transistor T9 and the tenth transistor T10 are all turned off; the signal on the compensation control signal line Bctr is low level Vgl, and the compensation module 150 is also turned off. The data line Data transmits the data voltage to the first electrode of the fifth transistor T5, and the first control signal line Ctrl1 inputs the low level Vgl to the gate of the fifth transistor T5, so that the fifth transistor T5 is turned on, and the data voltage is transmitted to the input end of the latch unit 141, so that the latch unit 141 outputs the first voltage or the second voltage to the sixth transistor T6 according to the size of the data voltage.

[0113] refer to Figure 3 and Figure 7 In the second light-emitting stage t5, the signals on the first scan line Scan1, the second scan line Scan2 and the light-emitting control signal line are all high level Vgh, and accordingly, the seventh transistor T7, the eleventh transistor T11, the ninth transistor T9 and the tenth transistor T10 are all turned off; the signal on the compensation control signal line Bctr is low level Vgl, and the compensation module 150 is also turned off. The second control signal line Ctrl2 inputs a low level Vgl to the gate of the sixth transistor T6, so that the sixth transistor T6 is turned on, and the first voltage or the second voltage latched and output by the latch unit 141 is output to the anode of the light-emitting device through the sixth transistor T6. When the voltage latched by the latch unit 141 is the first voltage, the light-emitting device emits light; when the voltage latched by the latch unit 141 is the second voltage, the light-emitting device does not emit light.

[0114] In the second display stage, the driving chip may not output a voltage to the data line Data, and the output terminal of the driving chip is in a floating state N / A.

[0115] An embodiment of the present invention further provides a method for driving a pixel circuit. The method for driving a pixel circuit is used to drive the pixel circuit of any of the above embodiments of the present invention. Figure 8 is a flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention, with reference to Figure 8 Optionally, the driving method of the pixel circuit includes:

[0116] Step 210: In the first display mode, the data writing module writes a data voltage to the control terminal of the driving module in the data writing phase; the driving module outputs a driving current to the light emitting module according to the voltage of its own control terminal in the first light emitting phase;

[0117] Step 220: In the second display mode, the latch module outputs the first voltage or the second voltage to the first end of the light emitting module in the second light emitting phase according to the magnitude of the input data voltage.

[0118] The first voltage is a voltage that makes the light-emitting module emit light, and the second voltage is a voltage that makes the light-emitting module not emit light.

[0119] Optionally, the picture switching frequency in the first display mode is greater than the picture switching frequency in the second display mode.

[0120] Optionally, the driving method further includes: in the first display mode, the latch module outputs a second voltage to the first end of the light emitting module in a first initialization phase according to an input set voltage.

[0121] The driving method of the pixel circuit is used to drive the pixel circuit of any of the above embodiments of the present invention, and has the beneficial effects of the pixel circuit of any of the above embodiments of the present invention.

[0122] Optionally, the latch module includes a latch unit, an input control unit and an output control unit;

[0123] The above step 210 also includes:

[0124] The input control unit transmits the input set voltage to the input end of the latch unit in the first latch writing stage so that the latch unit outputs a second voltage according to the set voltage; the output control unit transmits the second voltage to the first end of the light-emitting module in the first initialization stage; wherein the first latch writing stage is the latch writing stage in the first display mode.

[0125] The above step 220 includes:

[0126] The input control unit transmits the data voltage to the input end of the latch unit in the second latch writing stage, so that the latch unit is used to latch and output the first voltage or the second voltage according to the size of the data voltage; the output control unit transmits the first voltage or the second voltage to the first end of the light emitting module in the second light emitting stage; wherein the second latch writing stage is the latch writing stage in the second display mode;

[0127] Optionally, the driving method further includes:

[0128] In the second display mode, the luminous brightness of the light-emitting module is controlled by controlling the on-time of the output control unit. Specifically, since the first voltage and the second voltage latched by the latch unit are both fixed, in this embodiment, the luminous brightness of the light-emitting module is controlled by controlling the on-time of the output control unit, wherein the longer the on-time of the output control unit is, the brighter the brightness of the light-emitting module is visually.

[0129] An embodiment of the present invention further provides a display panel, Fig. 9 is a schematic diagram of a display panel provided by an embodiment of the present invention, with reference to Fig. 9, the display panel includes the pixel circuit 10 according to any of the above embodiments of the present invention.

[0130] Fig.10 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.10 The display panel includes a plurality of pixel circuits 20 and a plurality of latch modules 30, wherein each latch module 30 is connected to at least two pixel circuits 20, and the pixel circuit 20 includes a data writing module, a driving module and a light-emitting module; the latch module 30 includes an input control unit 31, a latch unit 32 and an output control unit 33 corresponding to at least two pixel circuits 20, wherein the input end of the latch unit 32 is connected to the data line connected to the pixel circuit 20 through the input control unit 31, and the output end of the latch unit 32 is connected to the first end of the light-emitting module of the corresponding pixel circuit 20 through the output control unit 33; wherein in the latch module 30, the control ends of different output control units 33 are connected to different signal lines. Fig.10 FIG. 2 schematically shows a situation where two pixel circuits 20 are connected to the same latch module 30 , wherein a control end of one output control unit 33 of the latch module 30 is connected to the first signal line L1 , and a control end of another output control unit 33 is connected to the second signal line L2 .

[0131] In this embodiment, by setting the latch module to include an input control unit 31, a latch unit 32, and an output control unit 33 corresponding to at least two pixel circuits, after the latch unit 32 latches the first voltage or the second voltage, the output control unit 33 controls whether the voltage latched by the latch unit 32 is output to the first end of the correspondingly connected light-emitting module, thereby controlling the light-emitting state of the light-emitting module of the correspondingly connected pixel circuit, so that the light-emitting state of multiple light-emitting modules can be controlled by latching the voltage of one latch unit 32. In addition, because the control ends of different output control units 33 are connected to different signal lines, it is possible to achieve that the light-emitting modules in the pixel circuit connected to the same latch module do not emit light at the same time, so that the display of color images can be achieved.

[0132] It should be noted that Fig.10 The pixel circuit is schematically shown in Figure 1 The pixel circuit shown in the figure removes the structure of the latch module, and the pixel circuit can also be Figure 3 The pixel circuit shown has a structure without a latch module.

[0133] Fig.11 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.11 In another optional embodiment of the present invention, in the latch module 30, the signal lines ( Fig.11The schematic output shows the situation that the control end of each output control unit is connected to the second control signal line Ctrl2, and the control end of the input control unit is connected to the first control signal line Ctrl1). The light-emitting modules in the pixel circuits connected to the same latch module emit light at the same time. Optionally, the pixel circuits corresponding to the red sub-pixel, the green sub-pixel and the blue sub-pixel included in a pixel are connected to the same latch module. Accordingly, Fig.11 As shown in the figure, the signal transmitted by the data line 40 connected to the red sub-pixel is the first data voltage VdataR corresponding to the red sub-pixel, the signal transmitted by the data line 40 connected to the green sub-pixel is the second data voltage VdataG corresponding to the green sub-pixel, the signal transmitted by the data line 40 connected to the blue sub-pixel is the third data voltage VdataB corresponding to the green sub-pixel, and the output control unit 33 connected to the red sub-pixel, the green sub-pixel and the blue sub-pixel are all connected to the second control signal line Ctrl2. In this case, the display panel can display a white picture in the bright state.

[0134] It should be noted that Fig.11 In the display panel shown, the structure of the pixel circuit 20 can be the same as that in the above embodiment. Figure 4 The pixel circuit shown has the same structure except that the latch module is removed.

[0135] The display panel of this embodiment can reduce the number of latch modules in the display panel by providing one latch module correspondingly connected to a plurality of pixel circuits, thereby facilitating improving the resolution of the display panel.

[0136] It should be noted that the input control unit 31 , the latch unit 32 and the output control unit 33 in this embodiment may have the same structure as those in other embodiments of the present invention, and will not be described in detail herein.

[0137] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A pixel circuit, characterized in that: include: Data writing module, driving module, light emitting module and latch module; The data writing module is used to write a data voltage to the control terminal of the driving module during the data writing stage in the first display mode; The driving module and the light-emitting module are connected in series between a first power line and a second power line, and the driving module is used to output a driving current to the light-emitting module according to a voltage at its control terminal in a first light-emitting stage in the first display mode; The latch module is electrically connected to the first end of the light emitting module, and is used to output a first voltage or a second voltage to the first end of the light emitting module in the second light emitting stage according to the size of the input data voltage in the second display mode, wherein the first voltage is a voltage that enables the light emitting module to emit light, and the second voltage is a voltage that enables the light emitting module not to emit light; the second end of the light emitting module is connected to the second power line; The latch module is also used to output a second voltage to the first end of the light emitting module in a first initialization phase according to an input set voltage in the first display mode; The latch module includes a latch unit, an input control unit and an output control unit; the input end of the latch unit is electrically connected to the data line through the input control unit, and the output end of the latch unit is electrically connected to the first end of the light emitting module through the output control unit; The input control unit is used to transmit the input setting voltage to the input end of the latch unit in the first latch writing stage, so that the latch unit latches and outputs the second voltage according to the setting voltage; the output control unit is used to transmit the second voltage to the first end of the light emitting module in the first initialization stage; wherein the first latch writing stage is the latch writing stage in the first display mode; And / or, the input control unit is used to transmit the data voltage to the input end of the latch unit in the second latch write phase, so that the latch unit is used to latch and output the first voltage or the second voltage according to the size of the data voltage; the output control unit is used to transmit the first voltage or the second voltage to the first end of the light-emitting module in the second light-emitting phase; wherein the second latch write phase is the latch write phase under the second display mode.

2. The pixel circuit according to claim 1, characterized in that: The picture switching frequency in the first display mode is greater than the picture switching frequency in the second display mode.

3. The pixel circuit according to claim 1, characterized in that: The first latch write phase includes a power-on phase and a start period when the second display mode switches to the first display mode; and / or, the second latch write phase includes a start period when the first display mode switches to the second display mode; and a phase of switching between different display screens in the second display mode.

4. The pixel circuit according to claim 1, characterized in that: The control end of the input control unit is connected to the first control signal line, the first end of the input control unit is connected to the data line, and the second end of the input control unit is connected to the input end of the latch unit; the control end of the output control unit is connected to the second control signal line, the first end of the output control unit is connected to the output end of the latch unit, and the second end of the output control unit is connected to the first end of the light-emitting module.

5. The pixel circuit according to claim 4, characterized in that: The control end of the data writing module is connected to the first scan line, the first end of the data writing module is connected to the data line, and the second end of the data writing module is connected to the first end of the driving module; The pixel circuit further comprises a compensation module, a control end of the compensation module is connected to a compensation control signal line, a first end of the compensation module is connected to a second end of the driving module, and a second end of the compensation module is connected to a control end of the driving module; The pixel circuit further includes a first light-emitting control module and a second light-emitting control module. The first light-emitting control module, the driving module, the second light-emitting control module, and the light-emitting module are connected in series between the first power line and the second power line.

6. The pixel circuit according to claim 1, characterized in that: The latch unit includes a first transistor, a second transistor, a third transistor and a fourth transistor; The gate of the first transistor is electrically connected to the input terminal of the latch unit, the first electrode of the first transistor is connected to the first voltage, the second electrode of the first transistor is electrically connected to the first electrode of the second transistor, the gate of the second transistor is electrically connected to the input terminal of the latch unit, and the second electrode of the second transistor is connected to the second voltage; The gate of the third transistor is electrically connected to the output end of the latch unit, the first electrode of the third transistor is connected to the first voltage, the second electrode of the third transistor is electrically connected to the first electrode of the fourth transistor, the gate of the fourth transistor is electrically connected to the output end of the latch unit, and the second electrode of the latch unit is connected to the second voltage; The gate of the first transistor and the gate of the second transistor are electrically connected to the second electrode of the third transistor; the gate of the third transistor and the gate of the fourth transistor are electrically connected to the second electrode of the first transistor; The first transistor and the third transistor have the same channel type, and the second transistor and the fourth transistor have the same channel type.

7. The pixel circuit according to claim 1, characterized in that: The first voltage is equal to the voltage on the first power line; And / or the pixel circuit further includes an initialization module, a first end of the initialization module is connected to an initialization voltage, a second end of the initialization module is electrically connected to a control end of the driving module, and the initialization module is used to write the initialization voltage to the control end of the driving module in the first initialization stage; or the initialization module is used to write the initialization voltage to the control end of the driving module in a second initialization stage, wherein the second initialization stage is not performed simultaneously with the first initialization stage; The second voltage is equal to the initialization voltage.

8. A method for driving a pixel circuit, characterized in that: Used to drive the pixel circuit according to any one of claims 1 to 7, the driving method comprising: In the first display mode, the data writing module writes a data voltage to the control terminal of the driving module in the data writing phase; the driving module outputs a driving current to the light emitting module according to the voltage of its own control terminal in the first light emitting phase; In the second display mode, the latch module outputs the first voltage or the second voltage to the first end of the light emitting module in the second light emitting stage according to the magnitude of the input data voltage; The latch module includes a latch unit, an input control unit and an output control unit; In the first display mode, the latch module outputs a second voltage to the first end of the light emitting module in a first initialization phase according to an input set voltage, including: The input control unit transmits the input setting voltage to the input terminal of the latch unit in the first latch writing stage, so that the latch unit outputs a second voltage according to the setting voltage; the output control unit transmits the second voltage to the first terminal of the light emitting module in the first initialization stage; And / or, in the second display mode, the latch module outputs the first voltage or the second voltage to the first end of the light emitting module in the second light emitting stage according to the size of the input data voltage, including: The input control unit transmits the data voltage to the input end of the latch unit in the second latch writing stage, so that the latch unit is used to latch and output the first voltage or the second voltage according to the size of the data voltage; the output control unit transmits the first voltage or the second voltage to the first end of the light emitting module in the second light emitting stage; The first latch-write phase is the latch-write phase in the first display mode; the second latch-write phase is the latch-write phase in the second display mode.

9. The driving method of the pixel circuit according to claim 8, characterized in that: The picture switching frequency in the first display mode is greater than the picture switching frequency in the second display mode.

10. The driving method of the pixel circuit according to claim 8, characterized in that: The driving method further includes: in the first display mode, the latch module outputs a second voltage to the first end of the light emitting module in a first initialization phase according to an input setting voltage.

11. The driving method of the pixel circuit according to claim 8, characterized in that: The driving method further comprises: In the second display mode, the light emitting brightness of the light emitting module is controlled by controlling the on-time of the output control unit.

12. A display panel, characterized in that: A pixel circuit comprising any one of claims 1 to 7; And / or, comprising a plurality of pixel circuits and a plurality of latch modules, each of the latch modules correspondingly connected to at least two of the pixel circuits, the pixel circuit comprising a data writing module, a driving module and a light emitting module; The latch module comprises an input control unit, a latch unit and an output control unit corresponding to the pixel circuits connected to the latch module, wherein the input end of the latch unit is connected to a data line connected to a corresponding pixel circuit through the input control unit, and the output end of the latch unit is connected to a first end of a light-emitting module of a corresponding pixel circuit through the corresponding output control unit; Wherein, in the latch module, control terminals of different output control units are connected to different signal lines.

Images