CN117577044A - Pixel circuit, driving method thereof and display panel - Google Patents
Pixel circuit, driving method thereof and display panel Download PDFInfo
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- CN117577044A CN117577044A CN202311491368.8A CN202311491368A CN117577044A CN 117577044 A CN117577044 A CN 117577044A CN 202311491368 A CN202311491368 A CN 202311491368A CN 117577044 A CN117577044 A CN 117577044A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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Abstract
The invention discloses a pixel circuit, a driving method thereof and a display panel, wherein an initialization module responds to a first scanning signal in a first initialization stage, and the potential of a control end of the driving module is coupled according to an accessed first initialization voltage to initialize the potential of the control end of the driving module; the data writing module writes data voltage into an internal control node of the pixel circuit in a data writing stage; the driving module generates driving current according to the electric potential of the control end of the driving module in the light-emitting stage; in the light emitting stage, the potential of the control end of the driving module is related to the potential of the internal control node. In the invention, the coupling of the potential of the control end of the drive module by the initialization module is instantaneously completed, so that the control end of the drive module can be fully initialized even if the time of the initialization stage is short, thereby being beneficial to improving the picture display quality.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a driving method thereof and a display panel.
Background
With the development of display technology, the requirement for the picture display quality of the display panel is also increasing.
The display panel comprises a plurality of pixel circuits, wherein each pixel circuit comprises a driving transistor and an initializing module for initializing the grid electrode of the driving transistor.
However, the pixel circuit in the related art has a problem that the gate of the driving transistor is not completely initialized, which affects the picture display quality of the display panel.
Disclosure of Invention
The invention provides a pixel circuit, a driving method thereof and a display panel, which are used for realizing the full initialization of a control end of a driving module and improving the picture display quality of the display panel.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including: the device comprises a data writing module, a driving module and an initializing module;
the initialization module is used for responding to the first scanning signal in the first initialization stage, coupling the potential of the control end of the driving module according to the accessed first initialization voltage, and initializing the potential of the control end of the driving module;
the data writing module is used for writing data voltage into the internal control node of the pixel circuit in the data writing stage;
the driving module is used for generating driving current according to the electric potential of the control end of the driving module in the light-emitting stage; wherein in the light emitting stage, the potential of the control end of the driving module is related to the potential of the internal control node.
Optionally, the initialization module includes an initialization control unit and a coupling unit, a control end of the initialization control unit is connected to a first scanning signal, a first end of the initialization control unit is connected to a first initialization signal line, a second end of the initialization control unit is electrically connected to a first end of the coupling unit, and a second end of the coupling unit is electrically connected to a control end of the driving module; the first initialization signal line is used for transmitting a first initialization voltage; the initialization control unit is used for responding to a first scanning signal to transmit a first initialization voltage to a first end of the coupling unit in a first initialization stage, and the coupling unit is used for coupling the control end potential of the driving module according to potential jump of the first end of the coupling unit in the first initialization stage;
optionally, the initialization control unit includes a first transistor, a gate of the first transistor is used as a control end of the initialization control unit, a first pole of the first transistor is used as a first end of the initialization control unit, and a second pole of the first transistor is used as a second end of the first transistor;
the coupling unit comprises a first capacitor, one polar plate of the first capacitor is used as a first end of the coupling unit, and the other polar plate of the first capacitor is used as a second end of the coupling unit.
Optionally, the first end of the driving module is electrically connected with the first power signal line, and the pixel circuit further comprises a compensation module and a storage module;
the compensation module is connected between the second end of the driving module and the control end of the driving module; the compensation module is used for transmitting a first power supply voltage on a first power supply signal line to the control end of the driving module in a compensation stage;
the storage module comprises an internal control node, is used for transmitting a fixed voltage which is different from the voltage value of the data voltage to the internal control node in the light-emitting stage, and is used for coupling the potential of the control end of the driving module according to the potential change of the internal control node at the initial moment of the light-emitting stage;
the first end of the data writing module is electrically connected with the data line, and the second end of the data writing module is electrically connected with the internal control node;
optionally, the pixel circuit further includes a first light emitting control module, a first end of the first light emitting control module is electrically connected with a second end of the driving module, a second end of the first light emitting control module is connected with the light emitting device, a control end of the first light emitting control module is connected with a light emitting control signal, and the first light emitting control module is used for responding to the light emitting control signal to be turned on in a light emitting stage;
Optionally, the pixel circuit further includes a second initialization module, where the second initialization module is configured to write a second initialization voltage to the light emitting device in a second initialization phase;
optionally, the second initialization phase is performed simultaneously with the first initialization phase and/or the data writing phase.
Optionally, the storage module includes a coupling control unit and a coupling storage unit;
the coupling control unit is electrically connected with the internal control node and is used for transmitting a fixed voltage which is different from the voltage value of the data voltage to the internal control node in the light-emitting stage;
the first end of the coupling storage unit is electrically connected with the internal control node, and the second end of the coupling storage unit is electrically connected with the control end of the driving module; the coupling storage unit is used for coupling the potential of the control end of the driving module according to the potential change of the internal control node at the initial moment of the light-emitting stage;
optionally, the control end of the coupling control unit is connected with a light-emitting control signal;
optionally, the coupling control unit includes a second transistor, and the coupling storage unit includes a second capacitor;
optionally, the first end of the coupling control unit is electrically connected with the first initialization signal line;
the control end of the coupling control unit and the control end of the first light emitting control module are both connected with light emitting control signals.
Optionally, the data writing phase and the compensation phase are performed simultaneously; the first initialization phase is performed before the data writing phase;
alternatively, the data writing phase includes a first initialization phase and a compensation phase, the first initialization phase being performed before the compensation phase;
optionally, the control end of the compensation module and the control end of the data writing module are connected with a second scanning signal;
optionally, the active level pulse of the second scan signal follows the active level pulse of the first scan signal within one frame;
optionally, in one frame, the active level pulse of the second scan signal overlaps with the active level pulse of the first scan signal, and the active level pulse of the second scan signal ends after the active level pulse of the first scan signal.
Optionally, the control end of the driving module is used as an internal control node;
the pixel circuit further comprises a storage module, wherein a first end of the storage module is electrically connected with the first power signal wire, and a second end of the storage module is electrically connected with a control end of the driving module;
optionally, the first end of the data writing module is electrically connected with the data line, and the second end of the data writing module is electrically connected with the control end of the driving module;
Optionally, the first end of the data writing module is electrically connected with the data line, and the second end of the data writing module is electrically connected with the first end of the driving module; the pixel circuit further comprises a compensation module and a second light-emitting control module, wherein the compensation module is connected between the control end and the second end of the driving module and is used for compensating the threshold voltage of the driving transistor in the data writing stage; the data writing module is used for transmitting data voltage to the control end of the driving module through the driving module and the compensation module in the data writing stage; the second light-emitting control module is used for controlling the disconnection between the first power supply signal wire and the first end of the driving module, the disconnection between the second end of the driving module and the light-emitting device in the data writing stage, and the conduction between the first power supply signal wire and the first end of the driving module and the conduction between the second end of the driving module and the light-emitting device in the light-emitting stage;
optionally, the pixel circuit further includes a second initialization module, where the second initialization module is configured to write a second initialization voltage to the light emitting device in a second initialization phase;
optionally, the second initialization phase is performed simultaneously with the first initialization phase and/or the data writing phase.
In a second aspect, an embodiment of the present invention further provides a driving method of a pixel circuit, including:
in a first initialization stage, transmitting a first scanning signal of an effective level to an initialization module, coupling a control end of a driving module by the initialization module according to the accessed first initialization voltage, and initializing the potential of the control end of the driving module;
in the data writing stage, the control data writing module writes data voltage into an internal control node of the pixel circuit;
in the light-emitting stage, the driving module generates driving current according to the electric potential of the control end of the driving module; wherein in the light emitting stage, the potential of the control end of the driving module is related to the potential of the internal control node.
Optionally, the pixel circuit further includes a compensation module and a storage module, the storage module including an internal control node; the driving method further includes:
in the compensation stage, the control compensation module transmits a first power supply voltage on a first power supply signal line to the control of the driving module;
in the lighting stage, the control storage module transmits a fixed voltage different from the voltage value of the data voltage to the internal control node, and the storage module couples the potential of the control end of the driving module according to the potential change of the internal control node at the initial moment of the lighting stage.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel circuit of the first aspect.
According to the pixel circuit, the driving method thereof and the display panel, the first scanning signal is responded in a first initialization stage through the initialization module, the potential of the control end of the driving module is coupled according to the accessed first initialization voltage, and the potential of the control end of the driving module is initialized; the data writing module writes data voltage into an internal control node of the pixel circuit in a data writing stage; the driving module generates driving current according to the electric potential of the control end of the driving module in the light-emitting stage; in the light-emitting stage, the potential of the control end of the driving module is related to the potential of the internal control node, and in the data writing stage, the internal control node is written with the data voltage, so that the potential of the internal control node is related to the data voltage, that is, the potential of the control end of the driving module is related to the data voltage, correspondingly, the driving module can generate the driving current related to the data voltage, and the driving current generated by the driving module can be output to the light-emitting device, thereby driving the light-emitting device. In the embodiment of the invention, the coupling of the potential of the control end of the driving module by the initialization module is completed instantaneously, so that the control end of the driving module can be fully initialized even if the time of the initialization stage is short, thereby being beneficial to improving the picture display quality.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;
fig. 4 is a driving timing diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 5 is a timing diagram of driving another pixel circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 7 is a timing diagram of driving another pixel circuit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;
fig. 9 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As described in the background art, the pixel circuit in the related art has a problem of incomplete gate initialization of the driving transistor, which affects the picture display quality of the display panel. The inventor has found that the above problem occurs because the pixel circuit in the related art includes a driving transistor and an initializing transistor connected to a gate of the driving transistor, the initializing transistor is connected to an initializing signal line, a path is formed between a power signal line connected to the pixel circuit and the initializing signal line when the gate of the driving transistor is initialized, so that a large current flows between the power signal line and the initializing signal line, and in order to reduce the influence of the large current on the display effect, the initializing time is set to be very short, so that the initializing voltage cannot be sufficiently written into the gate of the driving transistor in the very short time, the gate initializing of the driving transistor is incomplete, the writing of the data voltage in the subsequent process is affected, and finally the display effect is affected, that is, the gate initializing of the driving transistor is incomplete, and the picture display quality of the display panel is affected.
For the above reasons, the embodiment of the present invention provides a pixel circuit, and fig. 1 is a schematic structural diagram of the pixel circuit provided in the embodiment of the present invention, and referring to fig. 1, the pixel circuit includes: a data writing module 110, a driving module 120, and an initializing module 130; the initialization module 130 is configured to respond to the first Scan signal Scan1 in a first initialization stage, couple the potential of the control terminal G1 of the driving module 120 according to the accessed first initialization voltage, and initialize the potential of the control terminal G1 of the driving module 120; the data writing module 110 is configured to write a data voltage to the internal control node N1 of the pixel circuit during a data writing phase; the driving module 120 is configured to generate a driving current according to a potential of a control terminal G1 of the driving module 120 in a light emitting stage; wherein during the light emitting phase, the potential of the control terminal G1 of the driving module 120 is related to the potential of the internal control node N1.
The initialization module 130 includes a circuit structure with a voltage coupling function. In the first initialization stage, the first Scan signal Scan1 is at an active level, and the initialization module 130 may respond to the first Scan signal Scan1 in the first initialization stage, and couple the electric potential of the control terminal G1 of the driving module 120 according to the accessed first initialization voltage, so as to initialize the electric potential of the control terminal of the driving module 120. The coupling of the initializing module 130 to the potential of the control terminal G1 of the driving module 120 is instantaneously completed, so that even if the time of the initializing stage is short, the full initialization of the control terminal G1 of the driving module 120 can be still realized, which is beneficial to improving the display effect.
The pixel circuit includes an internal control node N1, and the data writing module 110 writes a data voltage to the internal control node N1 of the pixel circuit in a data writing stage. Wherein, for the writing form of the data voltage, at least two kinds may be included. The first mode is to write directly to the control terminal G1 of the driving module 120 through the switching device, in which case, the control terminal G1 of the driving module 120 may be used as the internal control node N1 (i.e. the circuit configuration output in fig. 1). In the second mode, the data voltage is written into one end of the circuit device with the voltage coupling function, and the control end of the driving module 120 is coupled to the voltage related to the data voltage, in this case, the first end of the circuit device with the voltage coupling function may be used as the internal control node N1 to connect to the data writing module 110, and the second end may be connected to the control end G1 of the driving module 120.
The pixel circuit further includes a driving module 120, in the light emitting stage, the driving module 120 generates a driving current according to the potential of the control terminal, the potential of the control terminal G1 of the driving module 120 is related to the potential of the internal control node N1, and in the data writing stage, the internal control node N1 is written with a data voltage, so that the potential of the internal control node N1 is related to the data voltage, that is, the potential of the control terminal G1 of the driving module 120 is related to the data voltage, accordingly, the driving module 120 can generate a driving current related to the data voltage, and the driving current generated by the driving module 120 can be output to the light emitting device, so that the driving of the light emitting device is realized, and when different data voltages are output to the pixel circuit, the driving module 120 can generate different driving currents, so that the different light emitting brightness of the light emitting device is controlled.
Optionally, the pixel circuit further includes a light emitting module 140, and the driving module 120 and the light emitting module 140 are connected in series between the first power signal line VDD and the second power signal line VSS.
In the pixel circuit of the embodiment, the initialization module responds to the first scanning signal in the first initialization stage, couples the potential of the control end of the driving module according to the accessed first initialization voltage, and initializes the potential of the control end of the driving module; the data writing module writes data voltage into an internal control node of the pixel circuit in a data writing stage; the driving module generates driving current according to the electric potential of the control end of the driving module in the light-emitting stage; in the light-emitting stage, the potential of the control end of the driving module is related to the potential of the internal control node, and in the data writing stage, the internal control node is written with the data voltage, so that the potential of the internal control node is related to the data voltage, that is, the potential of the control end of the driving module is related to the data voltage, correspondingly, the driving module can generate the driving current related to the data voltage, and the driving current generated by the driving module can be output to the light-emitting device, thereby driving the light-emitting device. In this embodiment, the coupling of the initializing module to the electric potential of the control terminal of the driving module is completed instantaneously, so that even if the time of the initializing stage is short, the control terminal of the driving module can be fully initialized, thereby being beneficial to improving the picture display quality.
Fig. 2 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, referring to fig. 2, optionally, the initialization module 130 includes an initialization control unit 131 and a coupling unit 132, a control end of the initialization control unit 131 is connected to a first Scan signal Scan1, a first end of the initialization control unit 131 is connected to a first initialization signal line Vref1, a second end of the initialization control unit 131 is electrically connected to a first end of the coupling unit 132, and a second end of the coupling unit 132 is electrically connected to a control end G1 of the driving module 120; the first initialization signal line Vref1 is used for transmitting a first initialization voltage; the initialization control unit 131 is configured to transmit a first initialization voltage to a first terminal of the coupling unit 132 in response to the first Scan signal Scan1 during a first initialization stage, where the coupling unit 132 is configured to couple the control terminal G1 of the driving module 120 according to a potential jump of the first terminal during the first initialization stage.
The initialization control unit 131 may include a switching device, the initialization control unit 131 may be turned on or off according to a first Scan signal Scan1 accessed by a control terminal of the initialization control unit 131, when the first Scan signal Scan1 is at an active level, the initialization control unit 131 is turned on, and when the first Scan signal Scan1 is at an inactive level, the initialization control unit 131 is turned off. The pixel circuit works in one frame at least comprising a first initialization phase, a data writing phase and a light emitting phase. In the first initialization stage, the first Scan signal Scan1 is at an active level, so the initialization control unit 131 is turned on to transmit the first initialization voltage to the first terminal of the coupling unit 132. In at least part of the data writing phase and the light emitting phase, the first Scan signal Scan1 is at an inactive level, and the initialization control unit 131 is turned off. At least part of the data writing phase is performed after the first initialization phase and the light emitting phase is performed after the data writing phase. Since the potential of the control terminal G1 of the driving module 120 changes after the first initialization stage, that is, the potential of the second terminal of the coupling unit 132 changes after the first initialization stage, and the potential of the first terminal of the coupling unit 132 changes with the change of the potential of the second terminal when the initialization control unit 131 is turned off, the potential of the first terminal of the coupling unit 132 also jumps from the first initialization voltage to other voltages after the first initialization stage. Therefore, in the first initialization stage, the initialization control unit 131 is turned on according to the first Scan signal Scan1 accessed by the gate, and transmits the first initialization voltage to the first end of the coupling unit 132, so that the potential at the first end of the coupling unit 132 hops, and correspondingly, the potential at the second end of the coupling unit 132 hops, that is, the potential at the control end G1 of the driving module 120 hops along with the hopping of the potential at the first end of the coupling unit 132, thereby initializing the potential at the control end G1 of the driving module 120.
On the basis of the above technical solution, optionally, the initialization control unit 131 includes a first transistor T1, a gate of the first transistor T1 is used as a control terminal of the initialization control unit 131, a first pole of the first transistor T1 is used as a first terminal of the initialization control unit 131, and a second pole of the first transistor T1 is used as a second terminal of the first transistor T1.
Optionally, the coupling unit 132 includes a first capacitor C1, where one plate of the first capacitor C1 is used as a first end of the coupling unit 132, and the other plate of the first capacitor C1 is used as a second end of the coupling unit 132. The first capacitor C1 is a circuit device with a voltage coupling function in the initializing module 130, and can initialize the control terminal G1 of the driving module 120 through the coupling function, so that the initialization of the control terminal G1 of the driving module 120 can be completed instantaneously.
As described in the above embodiment, for the writing form of the data voltage, including by writing the data voltage to one terminal of the circuit device having the voltage coupling function and coupling the control terminal of the driving module 120 to the voltage related to the data voltage, in this case, the first terminal of the circuit device having the voltage coupling function may be connected to the data writing module 110 as the internal control node N1, and the second terminal may be connected to the control terminal G1 of the driving module 120.
Fig. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, where a first end of a circuit device having a voltage coupling function may be used as an internal control node N1 to connect to the data writing module 110, and a second end may be connected to the control end G1 of the driving module 120. Referring to fig. 3, optionally, a first end of the driving module 120 is electrically connected to the first power signal line VDD, and the pixel circuit further includes a compensation module 150 and a storage module 160; the compensation module 150 is connected between the second end of the driving module 120 and the control end G1 of the driving module 120; the compensation module 150 is configured to transmit a first power voltage on the first power signal line VDD to the control terminal G1 of the driving module 120 during the compensation phase; the storage module 160 includes an internal control node N1, and is configured to transmit a fixed voltage different from a voltage value of the data voltage to the internal control node N1 in a light-emitting phase, and couple a potential of a control terminal G1 of the driving module 120 according to a potential change of the internal control node N1 at an initial time of the light-emitting phase; the first end of the Data writing module 110 is electrically connected to the Data line Data, and the second end of the Data writing module 110 is electrically connected to the internal control node N1.
In this embodiment, the working process of the pixel circuit further includes a compensation stage, in which the compensation module 150 is turned on, the driving module 120 is also turned on, the first power voltage is transmitted to the control terminal G1 of the driving module 120 through the driving module 120 and the compensation module 150, and in this process, the threshold voltage compensation of the driving transistor DT included in the driving module 120 is implemented. The pixel circuit further includes a memory module 160, the internal control node N1 is included in the memory module 160, the internal control node N1 is written with a data voltage during a data writing period, the memory module 160 transmits a fixed voltage different from the data voltage to the internal control node N1 during a light emitting period, so that a potential of the internal control node N1 changes (a potential change amount is a difference between the fixed voltage and the data voltage), and a potential of the control terminal G1 of the driving module 120 is coupled according to the potential change of the internal control node N1, so that a potential of the control terminal G1 of the driving module 120 also changes correspondingly, and further, the control terminal G1 of the driving module 120 is coupled to a voltage related to the data voltage. In the light emitting stage, the driving module 120 generates a driving current according to the voltage of its own control terminal and the first power voltage, and drives the light emitting device to emit light. In the pixel circuit of this embodiment, the compensation module 150 performs the compensation phase on the threshold voltage of the driving transistor, and the coupling of the control terminal G1 of the driving module 120 to the voltage related to the data voltage is completed instantaneously at the initial time of the light emitting phase, that is, the compensation for the threshold voltage of the driving transistor and the coupling of the control terminal G1 of the driving module 120 to the voltage related to the data voltage are performed separately, so that on one hand, the control terminal G1 of the driving module 120 can be quickly coupled to the voltage related to the data voltage, and on the other hand, the time of the compensation phase can be set longer, thereby ensuring the sufficient compensation for the threshold voltage of the driving transistor.
With continued reference to fig. 3, on the basis of the above technical solution, optionally, the storage module 160 includes a coupling control unit 161 and a coupling storage unit 162; the coupling control unit 161 is electrically connected to the internal control node N1, and the coupling control unit 161 is configured to transmit a fixed voltage different from a voltage value of the data voltage to the internal control node N1 in a light emitting stage; the first end of the coupling storage unit 162 is electrically connected with the internal control node N1, and the second end of the coupling storage unit 162 is electrically connected with the control end G1 of the driving module 120; the coupling storage unit 162 is configured to couple the potential of the control terminal G1 of the driving module 120 according to the potential change of the internal control node N1 at the initial time of the light emitting phase.
Wherein the coupling control unit 161 includes a switching device, and the coupling control unit 161 is turned off in a phase other than the light emitting phase, so that the potential of the internal control node N1 is controlled by other modules in the pixel circuit in the phase other than the light emitting phase. For example, in the data writing stage, the data writing module 110 is turned on to transmit the data voltage to the internal control node N1. In the lighting phase, the coupling control unit 161 is turned on, and a fixed voltage different from the voltage value of the data voltage is transmitted to the internal control node N1, so that the potential of the internal control node N1 is instantaneously hopped from the data voltage to the fixed voltage, that is, the potential of the internal control node N1 is hopped from the data voltage to the fixed voltage transmitted by the coupling control unit 161 at the initial time of the lighting phase, the coupling storage unit 162 couples the potential of the control terminal G1 of the driving module 120 according to the potential change of the internal control node N1, so that the potential of the control terminal G1 of the driving module 120 is instantaneously coupled and changed, so that the potential of the control terminal G1 of the driving module 120 is hopped to the potential related to the data voltage, the coupling control unit 161 remains turned on in the lighting phase, the coupling storage unit 162 maintains the potential difference between two ends, and the driving module 120 generates a driving current according to the potential of the control terminal.
On the basis of the above technical solution, optionally, the coupling control unit 161 includes a second transistor T2, and the coupling storage unit 162 includes a second capacitor C2.
With continued reference to fig. 3, the optional pixel circuit further includes a first light emitting control module 170, a first end of the first light emitting control module 170 is electrically connected to a second end of the driving module 120, a second end of the first light emitting control module 170 is connected to the light emitting device, a control end of the first light emitting control module 170 is connected to the light emitting control signal EM, and the first light emitting control module 170 is configured to respond to the light emitting control signal EM to be turned on during a light emitting period.
The control terminal of the first light emitting control module 170 is connected to the light emitting control signal EM, and the light emitting control signal EM is at an inactive level in a phase other than the light emitting phase (e.g., the first initialization phase, the data writing phase), so that the first light emitting control module 170 is turned off, and the driving transistor is prevented from being turned on in a phase other than the light emitting phase to light the light emitting device, thereby ensuring the display effect. In the light emitting stage, the light emitting control signal EM is at an active level, the first light emitting control module 170 is turned on, and the driving current generated by the driving module 120 may be transmitted to the light emitting device (the light emitting module 140 includes the light emitting device) through the first light emitting control module 170, so as to realize driving of the light emitting device.
Optionally, the control end of the coupling control unit 161 is also connected to the light emission control signal EM, and the coupling control unit 161 and the first light emission control module 170 are turned on and off simultaneously.
With continued reference to fig. 3, the pixel circuit optionally further includes a second initialization module 180, the second initialization module 180 being configured to write a second initialization voltage to the light emitting device during a second initialization phase. The second initialization module 180 is connected to a second initialization signal line Vref2, and the second initialization signal line Vref2 is used for transmitting a second initialization voltage. The second initialization stage is performed before the light-emitting stage, so as to avoid the influence of residual charges of the light-emitting device in the previous frame on the light-emitting display of the current frame. In some optional embodiments of the present invention, the second initialization stage is performed simultaneously with the first initialization stage and/or the data writing stage, so that the total time of one frame is reduced, and thus the refresh rate of the picture is improved. In some alternative embodiments of the present invention, the first initialization signal line Vref1 and the second initialization signal line Vref2 may be the same signal line, so as to reduce the number of signal lines in the display panel, and accordingly, the first initialization voltage is equal to the second initialization voltage.
On the basis of the above technical solution, optionally, the driving module 120 includes a driving transistor DT, the data writing module 110 includes a third transistor T3, the compensating module 150 includes a fourth transistor T4, the first light emitting control module 170 includes a fifth transistor T5, and the second initializing module 180 includes a sixth transistor T6, where the third transistor T3 and the sixth transistor T6 may be dual-gate transistors, so as to ensure that the third transistor T3 and the sixth transistor T6 have smaller leakage currents, which is beneficial to improving the display effect. In other alternative embodiments of the present invention, the transistors in the pixel circuit may be N-type transistors, which are not limited herein.
Optionally, the control end of the compensation module 150 and the control end of the data writing module 110 are connected to the second Scan signal Scan2, and the control end of the second initialization module 180 is connected to the third Scan signal Scan3. Fig. 4 is a driving timing chart of a pixel circuit according to an embodiment of the present invention, and fig. 5 is a driving timing chart of another pixel circuit according to an embodiment of the present invention, where the driving timings shown in fig. 4 and 5 are applicable to driving the pixel circuit shown in fig. 3. Referring to fig. 3 to 5, the operation of the pixel circuit includes a first initialization stage t1, a second initialization stage t5, a data writing stage t2, a compensation stage t3, and a light emitting stage t4.
In the first initialization stage T1, the first Scan signal Scan1 is at a low level, the first transistor T1 is turned on, and the first initialization voltage is transmitted to the first plate of the first capacitor C1, so that the potential of the first plate of the first capacitor C1 jumps relative to the light emitting stage T4 of the previous frame, and correspondingly, the potential jump occurs between the first capacitor C1 and the second plate connected to the gate of the driving transistor DT (i.e., the control end G1 of the driving module 120), so as to realize the initialization of the gate potential of the driving transistor DT, which can be completed instantaneously, and ensure that the gate of the driving transistor DT can be fully initialized in a short time.
In the data writing stage T2, the second Scan signal Scan2 is at a low level, and the third transistor T3 is turned on to transmit the data voltage to the internal control node N1.
In the compensation stage T3, the second Scan signal Scan2 is at a low level, the fourth transistor T4 is turned on, the first power voltage is transmitted to the gate of the driving transistor DT through the driving transistor DT and the fourth transistor T4, so as to compensate the threshold voltage of the driving transistor DT, and at this time, the gate voltage of the driving transistor DT is elvdd+vth, where ELVDD is the first power voltage, and Vth is the threshold voltage of the driving transistor DT.
In the second initialization stage T5, the third Scan signal Scan3 is at a low level, the sixth transistor T6 is turned on, and the second initialization voltage is transmitted to the anode of the light emitting device, so as to initialize the anode of the light emitting device.
In the light emitting stage T4, the light emitting control signal EM is at a low level, the second transistor T2 is turned on, and a fixed voltage different from the data voltage is transmitted to the internal control node N1, so that the potential of the internal control node N1 is changed from the data voltage to a fixed voltage different from the data voltage, the potential jump variable of the internal control node N1 is V1-Vdata, where V1 is the fixed voltage to which the second transistor T2 is connected, and Vdata is the data voltage, and accordingly, the gate of the driving transistor DT is coupled to the potential related to the data voltage by the second capacitor C2 at the initial time of the light emitting stage T4, specifically elvdd+vth+k (V1-Vdata), where k is determined by the capacitance values of the first capacitor C1 and the second capacitor C2. The driving transistor DT generates a driving current according to a potential of a gate electrode and a first power voltage, and outputs the driving current to the light emitting device.
In the driving timing shown in fig. 4, the data writing stage t2 includes a first initialization stage t1 and a compensation stage t3, and the first initialization stage t1 is performed before the compensation stage t 3. Accordingly, within one frame, the active level pulse of the second Scan signal Scan2 overlaps with the active level pulse of the first Scan signal Scan1, and the active level pulse of the second Scan signal Scan2 ends after the active level pulse of the first Scan signal Scan 1. The overlapping interval of the active level pulse of the second Scan signal Scan2 and the active level pulse of the first Scan signal Scan1 corresponds to the first initialization phase t1, the interval of the active level of the second Scan signal Scan2 after the active level pulse of the first Scan signal Scan1 corresponds to the compensation phase t3, and the entire active level pulse interval of the second Scan signal Scan2 corresponds to the data writing phase t2. And fig. 4 schematically shows the case where the second initialization phase t5 is performed simultaneously with the data writing phase t2.
Under the driving timing shown in fig. 5, the data writing stage t2 and the compensation stage t3 are performed simultaneously; the first initialization phase t1 is performed before the data writing phase t 2; accordingly, the active level pulse of the second Scan signal Scan2 follows the active level pulse of the first Scan signal Scan1 within one frame. And fig. 5 schematically shows the case where the second initialization stage t5 is performed simultaneously with the first initialization stage t 1.
On the basis of the above technical solution, optionally, the first end of the coupling control unit 161 is electrically connected to the first initialization signal line Vref 1. The fixed voltage connected to the first terminal of the coupling control unit 161 is equal to the first initialization voltage. By doing so, it is possible to make it unnecessary to separately provide a signal line for transmitting a fixed voltage to the coupling control unit 161, which is advantageous in simplifying the wiring structure of the display panel.
As described above, for the writing form of the data voltage, the writing form further includes directly writing to the control terminal G1 of the driving module 120 through the switching device, in which case the control terminal G1 of the driving module 120 may serve as the internal control node N1. The pixel circuits shown in fig. 1 and 2 may correspond to a circuit for directly writing a data voltage to the control terminal G1 of the driving module 120 through a switching device. Fig. 6 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, where fig. 6 may correspond to one specific circuit of fig. 1 and 2, referring to fig. 6, the pixel circuit further includes a memory module, a first end of the memory module is electrically connected to the first power signal line VDD, and a second end of the memory module is electrically connected to the control end G1 of the driving module 120. Wherein the memory module may comprise a third capacitor C3. With continued reference to fig. 6, optionally, a first end of the Data writing module 110 is electrically connected to the Data line Data, a second end of the Data writing module 110 is electrically connected to the control end G1 of the driving module 120, and the control end of the Data writing module 110 is connected to the second Scan signal Scan2. Optionally, the data writing module 110 includes a third transistor T3, and the driving module 120 includes a driving transistor DT. The transistors in the pixel circuit may be P-type transistors or N-type transistors, and the embodiment is not limited herein, where fig. 6 schematically illustrates a case where each transistor in the pixel circuit is a P-type transistor.
Fig. 7 is a driving timing chart of another pixel circuit according to an embodiment of the present invention, where the driving timing chart may be used to drive the pixel circuit shown in fig. 6, and referring to fig. 6 and 7, the operation process of the pixel circuit includes a first initialization phase t1, a data writing phase t2, and a light emitting phase t4 sequentially performed.
In the first initialization stage T1, the first Scan signal Scan1 is at a low level, the first transistor T1 is turned on, and the first initialization voltage is transmitted to the first plate of the first capacitor C1, so that the potential of the first plate of the first capacitor C1 jumps relative to the light emitting stage T4 of the previous frame, and correspondingly, the potential jump occurs between the first capacitor C1 and the second plate connected to the gate of the driving transistor DT (i.e., the control end G1 of the driving module 120), so as to realize the initialization of the gate potential of the driving transistor DT, which can be completed instantaneously, and ensure that the gate of the driving transistor DT can be fully initialized in a short time.
In the data writing stage T2, the second Scan signal Scan2 is at a low level, the third transistor T3 is turned on, and the data voltage is transmitted to the gate of the driving transistor DT.
In the light emitting stage t4, the driving transistor DT generates a driving current according to the gate potential and the first power voltage on the first power signal line VDD to which the first electrode is connected, and outputs the driving current to the light emitting device, thereby driving the light emitting device.
Fig. 8 is a schematic diagram of another pixel circuit according to an embodiment of the present invention, where fig. 8 may be directly written into the control terminal G1 of the driving module 120 through a switching device, and the control terminal G1 of the driving module 120 may be used as another pixel circuit structure in the case of the internal control node N1. Referring to fig. 8, alternatively, a first end of the Data writing module 110 is electrically connected to the Data line Data, and a second end of the Data writing module 110 is electrically connected to a first end of the driving module 120; the pixel circuit further includes a compensation module 150 and a second light emitting control module, the compensation module 150 is connected between the control terminal G1 and the second terminal of the driving module 120, and the compensation module 150 is configured to compensate the threshold voltage of the driving transistor DT in the data writing stage t 2; the data writing module 110 is configured to transmit a data voltage to the control terminal G1 of the driving module 120 through the driving module 120 and the compensation module 150 in a data writing phase t 2; the second light emitting control module is used for controlling the disconnection between the first power signal line VDD and the first end of the driving module 120 and the disconnection between the second end of the driving module 120 and the light emitting device in the data writing stage t2, and for controlling the conduction between the first power signal line VDD and the first end of the driving module 120 and the conduction between the second end of the driving module 120 and the light emitting device in the light emitting stage t 4.
The second light emission control module may include a first light emission control unit 191 and a second light emission control unit 192, the first light emission control unit 191 being connected between the first power signal line VDD and the first end of the driving module 120, the second light emission control unit 192 being connected between the second end of the driving module 120 and the light emission module 140, the control ends of the first light emission control unit 191 and the second light emission control unit 192 being connected to the light emission control signal EM.
With continued reference to fig. 5, the driving module 120 may optionally include a driving transistor DT, the data writing module 110 includes a third transistor T3, the compensation module 150 includes a fourth transistor T4, the first light emitting control unit 191 includes a seventh transistor T7, and the second light emitting control unit 192 includes an eighth transistor T8. The third transistor T3 may be a double gate transistor.
The driving timing shown in fig. 7 may also be applied to driving the pixel circuit shown in fig. 8, and referring to fig. 7 and 8, the operation of the pixel circuit includes a first initialization phase t1, a data writing phase t2, and a light emitting phase t4.
In the first initialization stage T1, the first Scan signal Scan1 is at a low level, the first transistor T1 is turned on, and the first initialization voltage is transmitted to the first plate of the first capacitor C1, so that the potential of the first plate of the first capacitor C1 jumps relative to the light emitting stage T4 of the previous frame, and correspondingly, the potential jump occurs between the first capacitor C1 and the second plate connected to the gate of the driving transistor DT (i.e., the control end G1 of the driving module 120), so as to realize the initialization of the gate potential of the driving transistor DT, which can be completed instantaneously, and ensure that the gate of the driving transistor DT can be fully initialized in a short time.
In the data writing stage T2, the second Scan signal Scan2 is at a low level, the third transistor T3 and the fourth transistor T4 are turned on, the data voltage is transmitted to the gate of the driving transistor DT through the third transistor T3, the driving transistor DT and the fourth transistor T4, and in this process, the compensation of the threshold voltage of the driving transistor DT can be further realized.
In the light emitting stage T4, the light emission control signal EM is at a low level, the seventh transistor T7 and the eighth transistor T8 are turned on, and the driving transistor DT generates a driving current according to the gate potential and the first power voltage on the first power signal line VDD to which the first electrode is connected, and outputs the driving current to the light emitting device, thereby driving the light emitting device.
With continued reference to fig. 6 and 8, the pixel circuit optionally further includes a second initialization module 180, where the second initialization module 180 is configured to write a second initialization voltage to the light emitting device in a second initialization period t5, where the second initialization period t5 is performed before the light emitting period t4, so as to avoid an influence of residual charges of the light emitting device in a previous frame on the light emitting display of the present frame. The second initialization module 180 includes a sixth transistor T6. In some alternative embodiments of the present invention, the second initialization stage t5 is performed simultaneously with the first initialization stage t1 and/or the data writing stage t 2. The driving timing shown in fig. 7 corresponds to a case where the second initialization stage t5 is performed simultaneously with the first initialization stage t1, referring to fig. 6 and 8, in which the control terminal of the second initialization module 180 and the control terminal of the first initialization module are connected to the same control signal, i.e., the first Scan signal Scan1.
The embodiment of the present invention further provides a driving method of a pixel circuit, which may be used to drive the pixel circuit of any of the above embodiments of the present invention, and fig. 9 is a flowchart of the driving method of a pixel circuit provided by the embodiment of the present invention, and referring to fig. 9, the driving method of a pixel circuit includes:
step 210, in a first initialization stage, a first scanning signal of an effective level is transmitted to an initialization module, the initialization module couples a control end of the driving module according to the accessed first initialization voltage, and initializes a potential of the control end of the driving module.
In step 220, during the data writing stage, the control data writing module writes the data voltage to the internal control node of the pixel circuit.
Step 230, in the light emitting stage, the driving module generates a driving current according to the electric potential of the control end of the driving module; wherein in the light emitting stage, the potential of the control end of the driving module is related to the potential of the internal control node.
The driving method of the pixel circuit of the embodiment is used for driving the pixel circuit of any embodiment of the invention, and has the beneficial effects of the pixel circuit of any embodiment of the invention.
On the basis of the technical scheme, optionally, the pixel circuit further comprises a compensation module and a storage module, wherein the storage module comprises an internal control node; the driving method further includes:
In the compensation stage, the control compensation module transmits a first power supply voltage on a first power supply signal line to the control of the driving module; in the lighting stage, the control storage module transmits a fixed voltage different from the voltage value of the data voltage to the internal control node, and the storage module couples the potential of the control end of the driving module according to the potential change of the internal control node at the initial moment of the lighting stage.
The compensation module performs the compensation phase on the threshold voltage of the driving transistor, and the coupling of the control end of the driving module to the voltage related to the data voltage can be completed instantaneously at the initial moment of the light emitting phase, namely, the compensation on the threshold voltage of the driving transistor and the coupling of the control end of the driving module to the voltage related to the data voltage are performed separately, so that on one hand, the control end of the driving module can be quickly coupled to the voltage related to the data voltage, and on the other hand, the time of the compensation phase can be set longer, and the full compensation on the threshold voltage of the driving transistor is ensured.
The embodiment of the invention also provides a display panel which comprises the pixel circuit of any embodiment of the invention, and has the beneficial effects of any embodiment of the invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A pixel circuit, comprising: the device comprises a data writing module, a driving module and an initializing module;
the data writing module is used for writing data voltage into an internal control node of the pixel circuit in a data writing stage;
the driving module is used for generating driving current according to the potential of the control end of the driving module in a light-emitting stage, wherein the potential of the control end of the driving module is related to the potential of the internal control node;
the initialization module is used for responding to a first scanning signal in a first initialization stage, coupling the potential of the control end of the driving module according to the accessed first initialization voltage, and initializing the potential of the control end of the driving module.
2. The pixel circuit according to claim 1, wherein the initialization module comprises an initialization control unit and a coupling unit, a control end of the initialization control unit is connected to the first scanning signal, a first end of the initialization control unit is connected to a first initialization signal line, a second end of the initialization control unit is electrically connected to a first end of the coupling unit, and a second end of the coupling unit is electrically connected to a control end of the driving module; the first initialization signal line is used for transmitting the first initialization voltage; the initialization control unit is used for responding to the first scanning signal to transmit the first initialization voltage to the first end of the coupling unit in the first initialization stage, and the coupling unit is used for coupling the control end potential of the driving module according to the potential jump of the first end of the coupling unit in the first initialization stage;
preferably, the initialization control unit includes a first transistor, a gate of the first transistor is used as a control terminal of the initialization control unit, a first pole of the first transistor is used as a first terminal of the initialization control unit, and a second pole of the first transistor is used as a second terminal of the first transistor;
The coupling unit comprises a first capacitor, one polar plate of the first capacitor is used as a first end of the coupling unit, and the other polar plate of the first capacitor is used as a second end of the coupling unit.
3. The pixel circuit according to claim 1 or 2, wherein the first end of the driving module is electrically connected to a first power signal line, the pixel circuit further comprising a compensation module and a storage module;
the compensation module is connected between the second end of the driving module and the control end of the driving module; the compensation module is used for transmitting a first power supply voltage on the first power supply signal line to the control end of the driving module in a compensation stage;
the storage module comprises the internal control node, is used for transmitting a fixed voltage which is different from the voltage value of the data voltage to the internal control node in a light-emitting stage, and couples the potential of the control end of the driving module according to the potential change of the internal control node at the initial moment of the light-emitting stage;
the first end of the data writing module is electrically connected with the data line, and the second end of the data writing module is electrically connected with the internal control node;
Preferably, the pixel circuit further includes a first light emitting control module, a first end of the first light emitting control module is electrically connected with a second end of the driving module, a second end of the first light emitting control module is used as a connection light emitting device, a control end of the first light emitting control module is connected with a light emitting control signal, and the first light emitting control module is used for responding to the light emitting control signal to be turned on in the light emitting stage;
preferably, the pixel circuit further includes a second initialization module for writing a second initialization voltage to the light emitting device in a second initialization phase;
preferably, the second initialization phase is performed simultaneously with the first initialization phase and/or the data writing phase.
4. A pixel circuit according to claim 3, wherein the memory module comprises a coupling control unit and a coupling memory unit;
the coupling control unit is electrically connected with the internal control node and is used for transmitting a fixed voltage which is different from the voltage value of the data voltage to the internal control node in a light-emitting stage;
the first end of the coupling storage unit is electrically connected with the internal control node, and the second end of the coupling storage unit is electrically connected with the control end of the driving module; the coupling storage unit is used for coupling the potential of the control end of the driving module according to the potential change of the internal control node at the initial moment of the light-emitting stage;
Preferably, a control end of the coupling control unit is connected to the light-emitting control signal;
preferably, the coupling control unit includes a second transistor, and the coupling storage unit includes a second capacitor.
5. The pixel circuit according to claim 4, wherein a first end of the coupling control unit is electrically connected to the first initialization signal line;
the control end of the coupling control unit and the control end of the first light emitting control module are connected with a light emitting control signal.
6. A pixel circuit according to claim 3, wherein the data writing phase and the compensation phase are performed simultaneously; the first initialization phase is performed before the data writing phase;
alternatively, the data writing phase includes the first initialization phase and the compensation phase, the first initialization phase being performed before the compensation phase;
preferably, the control end of the compensation module and the control end of the data writing module are connected with a second scanning signal;
preferably, the active level pulse of the second scan signal is after the active level pulse of the first scan signal within one frame;
Preferably, in one frame, the active level pulse of the second scan signal overlaps with the active level pulse of the first scan signal, and the active level pulse of the second scan signal ends after the active level pulse of the first scan signal.
7. A pixel circuit according to claim 1 or 2, wherein the control terminal of the drive module acts as the internal control node;
the pixel circuit further comprises a storage module, wherein a first end of the storage module is electrically connected with the first power signal line, and a second end of the storage module is electrically connected with the control end of the driving module;
preferably, the first end of the data writing module is electrically connected with the data line, and the second end of the data writing module is electrically connected with the control end of the driving module;
preferably, the first end of the data writing module is electrically connected with the data line, and the second end of the data writing module is electrically connected with the first end of the driving module;
the pixel circuit further comprises a compensation module and a second light-emitting control module, wherein the compensation module is connected between the control end and the second end of the driving module and is used for compensating the threshold voltage of the driving transistor in the data writing stage; the data writing module is used for transmitting the data voltage to the control end of the driving module through the driving module and the compensation module in the data writing stage;
The second light-emitting control module is used for controlling the disconnection between the first power supply signal line and the first end of the driving module, the disconnection between the second end of the driving module and the light-emitting device in the data writing stage, and the conduction between the first power supply signal line and the first end of the driving module and the conduction between the second end of the driving module and the light-emitting device in the light-emitting stage;
preferably, the pixel circuit further includes a second initialization module for writing a second initialization voltage to the light emitting device in a second initialization phase;
preferably, the second initialization phase is performed simultaneously with the first initialization phase and/or the data writing phase.
8. A driving method of a pixel circuit, comprising:
in a first initialization stage, transmitting a first scanning signal of an effective level to an initialization module, wherein the initialization module is used for coupling a control end of a driving module according to an accessed first initialization voltage and initializing the potential of the control end of the driving module;
in the data writing stage, controlling a data writing module to write data voltage to an internal control node of the pixel circuit;
In the light-emitting stage, the driving module generates driving current according to the potential of the control end of the driving module; wherein in the light emitting stage, the potential of the control end of the driving module is related to the potential of the internal control node.
9. The method according to claim 8, wherein the pixel circuit further comprises a compensation module and a storage module, the storage module including the internal control node;
the driving method further includes:
in a compensation stage, controlling the compensation module to transmit a first power supply voltage on a first power supply signal line to the control of the driving module;
and in the light-emitting stage, the storage module is controlled to transmit a fixed voltage which is different from the voltage value of the data voltage to the internal control node, and the storage module is coupled with the potential of the control end of the driving module according to the potential change of the internal control node at the initial moment of the light-emitting stage.
10. A display panel comprising the pixel circuit of any one of claims 1-7.
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| CN202311491368.8A CN117577044A (en) | 2023-11-09 | 2023-11-09 | Pixel circuit, driving method thereof and display panel |
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