CN112820242B - Pixel driving circuit, driving method thereof and display panel - Google Patents
Pixel driving circuit, driving method thereof and display panel Download PDFInfo
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- CN112820242B CN112820242B CN202110292448.5A CN202110292448A CN112820242B CN 112820242 B CN112820242 B CN 112820242B CN 202110292448 A CN202110292448 A CN 202110292448A CN 112820242 B CN112820242 B CN 112820242B
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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
- G09G3/32—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 semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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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
- G09G3/32—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 semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—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 semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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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
- G09G3/32—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 semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3266—Details of drivers for scan electrodes
Abstract
The invention discloses a pixel driving circuit, a driving method thereof and a display panel. The pixel driving circuit includes: a drive module; the first end of the storage module is connected with a first power supply signal; a first initialization module; the first end of the coupling module is electrically connected with the second end of the storage module, and the second end of the coupling module is electrically connected with the control end of the driving module; the threshold compensation module is used for conducting the second end of the driving module and the control end of the driving module in a threshold compensation stage and writing a reference signal into the second end of the coupling module so as to control the potential of the first end of the coupling module; the potential writing module is used for writing the potential of the second end of the storage module into the first end of the driving module in the threshold compensation stage; and the data writing module is used for writing the data signal into the second end of the storage module in the data writing stage. The invention can solve the problem of large fluctuation of errors during compensation of lower threshold values of different gray scales.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a pixel driving circuit, a driving method thereof, and a display panel.
Background
With the development of display technology, the display panel plays an increasingly greater role, the pixel driving circuit is used as an important component in the display panel, and can drive the light emitting unit in the display panel to emit light for display, and the pixel driving circuit directly affects the display quality of the display panel.
However, the conventional pixel driving circuit is prone to have the problems of high gray scale overcompensation and insufficient low gray scale compensation during driving, and the display effect of the display panel is seriously affected.
Disclosure of Invention
The invention provides a pixel driving circuit, a driving method thereof and a display panel, which are used for solving the problem that errors are fluctuated greatly when threshold values under different gray scales are compensated.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, where the pixel driving circuit includes: a driving module for providing a driving current to a light emitting module, the light emitting module being responsive to the driving current; the first end of the storage module is connected with a first power supply signal; a first initialization module, configured to write the first power signal into a second end of the memory module in an initialization phase; the first end of the coupling module is electrically connected with the second end of the storage module, and the second end of the coupling module is electrically connected with the control end of the driving module; the threshold compensation module is used for conducting a second end of the driving module and a control end of the driving module in a threshold compensation stage and writing a reference signal into a second end of the coupling module so as to control the potential of the first end of the coupling module; the potential writing module is used for writing the potential of the second end of the storage module into the first end of the driving module in a threshold compensation stage; and the data writing module is used for writing a data signal into the second end of the storage module in a data writing stage.
Optionally, the threshold compensation module comprises: a first threshold compensation submodule and a second threshold compensation submodule, wherein a first end of the first threshold compensation submodule is electrically connected with the light emitting module, a second end of the first threshold compensation submodule is electrically connected with a first end of the second threshold compensation submodule, a second end of the second threshold compensation submodule is electrically connected with a control end of the driving module, and a first end of the second threshold compensation submodule is connected into the reference signal; and the control end of the first threshold compensation submodule and the control end of the second threshold compensation submodule are connected into a first scanning signal.
Optionally, the first threshold compensation sub-module is further configured to be turned on in the initialization phase to initialize the light emitting module; the second threshold compensation sub-module is further configured to conduct during the initialization phase to initialize the driving module.
Optionally, a first end of the potential writing module is electrically connected to a second end of the storage module, a second end of the potential writing module is electrically connected to a first end of the driving module, and a control end of the potential writing module is connected to the first scanning signal; the first end of the first initialization module is electrically connected with the first end of the storage module, the second end of the first initialization module is electrically connected with the second end of the potential writing module, and the control end of the first initialization module is connected with a second scanning signal;
or the first end of the first initialization module is electrically connected with the first end of the memory module, the second end of the first initialization module is electrically connected with the second end of the memory module, and the control end of the first initialization module is accessed to the second scanning signal.
Optionally, the pixel driving circuit further includes: and the second end of the potential writing module is electrically connected with the second end of the driving module through the writing control module, wherein the second end of the potential writing module is electrically connected with the first end of the writing control module, the second end of the writing control module is electrically connected with the first end of the driving module, and the writing control module is used for switching off at the initialization stage.
Optionally, the pixel driving circuit further includes: a second initialization module, a first end of which is connected to the reference signal, a second end of which is electrically connected to the light emitting module, a second end of which is connected to a second scanning signal, and which is used to initialize the light emitting module in the initialization stage; and/or a third initialization module, a first end of the third initialization module being connected to the reference signal, a second end of the third initialization module being electrically connected to a control end of the driving module, the control end of the third initialization module being connected to a second scanning signal, the third initialization module being configured to initialize the driving module in the initialization stage.
Optionally, a first end of the potential writing module is electrically connected to a second end of the storage module, a second end of the potential writing module is electrically connected to a first end of the driving module, and a control end of the potential writing module is connected to the first scanning signal; the first end of the first initialization module is electrically connected with the first end of the storage module, the second end of the first initialization module is electrically connected with the second end of the storage module, and the control end of the first initialization module is connected to the second scanning signal.
Optionally, the pixel driving circuit further includes: and the first end of the light-emitting control module is connected with a second power supply signal, and the light-emitting control module is used for writing the second power supply signal into the first end of the driving module in a light-emitting stage.
In a second aspect, an embodiment of the present invention further provides a display panel, where the display panel includes the pixel driving circuit described in the first aspect.
In a third aspect, an embodiment of the present invention further provides a driving method for a pixel driving circuit, where the pixel driving circuit includes the pixel driving circuit described in the first aspect;
the driving method includes:
in an initialization stage, controlling the first initialization module to be conducted, and writing the first power supply signal into the second end of the storage module;
in a threshold compensation stage, the threshold compensation module and the potential writing module are conducted to capture the threshold voltage of the driving module, so that the driving current of the driving module is independent of the threshold voltage of the driving module; and in the data writing stage, the data writing module is conducted and writes the data signal into the second end of the storage module.
According to the technical scheme of the embodiment of the invention, the adopted pixel driving circuit comprises: the driving module is used for providing driving current to the light-emitting module, and the light-emitting module responds to the driving current; the first end of the storage module is connected with a first power supply signal; the first initialization module is used for writing a first power supply signal into the second end of the storage module in an initialization stage; the second end of the coupling module is electrically connected with the second end of the storage module, and the second end of the coupling module is electrically connected with the control end of the driving module; the threshold compensation module is used for electrically connecting the second end of the driving module with the control end of the driving module in a threshold compensation stage and writing a reference signal into the second end of the coupling module so as to control the potential of the first end of the coupling module; the potential writing module is used for writing the potential of the second end of the storage module into the first end of the driving module in the threshold compensation stage; and the data writing module is used for writing a data signal into the second end of the storage module in a data writing stage. In the threshold compensation stage, the threshold voltage of the driving module is not acquired through a data signal which can change along with a display picture, but acquired through a fixed reference voltage, when the display pictures are different, the reference voltage can not change, namely, the effect of acquiring the threshold voltage of the driving module can not change, so that the fluctuation of the threshold voltage acquisition error of the driving module is greatly reduced, the problem that the threshold voltage acquisition error of the driving module has larger fluctuation under different gray scales is solved, the defect of insufficient low-gray-scale compensation is overcome, and the display effect of the display panel is improved.
Drawings
Fig. 1 is a schematic circuit structure diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of another pixel driving circuit according to an embodiment of the present invention;
FIG. 3 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention;
FIG. 5 is a timing diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 6 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention;
FIG. 7 is a timing diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 9 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As mentioned in the background art, the conventional pixel driving circuit has the problems of high gray scale overcompensation and insufficient low gray scale compensation during driving, and the applicant has found through careful study that the technical problems are caused by: the existing pixel driving circuit generally adopts a gate following method to acquire a threshold voltage (Vth) of a driving transistor, however, the gate following method needs to acquire the threshold voltage of the driving transistor by using a data voltage (Vdata), the data voltage is influenced by a display picture, and a large fluctuation range (such as a high gray scale data voltage of about 2V and a low gray scale data voltage of about 6V) exists, so that the problems of high gray scale overcompensation and low gray scale undercompensation are caused, particularly, the threshold voltage compensation capability is seriously insufficient under an extremely low gray scale, the problems of serious low gray scale Mura (uneven display) and the like are caused, and the display effect of a display panel is seriously influenced.
In view of the above technical problems, the present application proposes the following solutions:
fig. 1 is a schematic circuit structure diagram of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 1, the pixel driving circuit includes: the driving module 101, the driving module 101 is used for providing a driving current to the light emitting module 108, and the light emitting module 108 emits light in response to the driving current; a memory module 102, a first end of the memory module 102 being connected to a first power signal VDD 1; the first initialization module 103, the first initialization module 103 is configured to write the first power signal VDD1 to the second terminal of the memory module 102 during an initialization phase; a coupling module 105, a first end of the coupling module 105 is electrically connected with a second end of the storage module 102, and a second end of the coupling module 105 is electrically connected with a control end of the driving module 101; a threshold compensation module 106, wherein the threshold compensation module 106 is configured to conduct the second terminal of the driving module 101 and the control terminal of the driving module 101 in a threshold compensation stage, and write a reference signal Vref into the second terminal of the coupling module 105 to control a potential of the first terminal of the coupling module 105; and a potential writing module 104, wherein the potential writing module 104 is configured to write the potential of the second terminal of the memory module 102 into the first terminal of the driving module 101 during the threshold compensation phase.
Specifically, the Light Emitting module 108 may be, for example, an OLED (Organic Light Emitting Diode), and the Light Emitting module 108 is a current-driven type device capable of Emitting Light in response to a driving current; the storage module 102 can maintain the electric potential of the control end of the driving module 101 to realize stable light-emitting display of the light-emitting module; the data writing module 107 is configured to write the data signal into the second end of the memory module in the data writing phase; a light-emitting control module 109, a first end of the light-emitting control module 109 is connected to the second power signal VDD2, and the light-emitting control module 109 is configured to write the second power signal VDD2 into the first end of the driving module 101 during a light-emitting phase; in this embodiment, the driving process of the pixel driving circuit can be divided into four stages, namely, an initialization stage, a threshold compensation stage, a data writing stage and a light emitting stage, in the initialization stage, the first initialization module 103 firstly writes the first power signal VDD1 into the second end of the memory module 102, the control end of the driving module 101 is set as the first node a, the second end of the memory module 102 is set as the second node B, that is, the potential of the second node B is VDD1 at this time; in the threshold compensation stage, because the second end of the driving module 101 is conducted with the control end by the threshold compensation module 106, and the reference signal Vref is continuously written into the second end of the coupling module 105, because of the action of the coupling module 105, the potential of the first end of the coupling module is controlled by the potential of the second end, that is, the second node B is also continuously charged at this time, because the second node B is conducted with the first end of the driving module 101, that is, the first end of the driving module 101 is continuously charged at this time, the charging is stopped until the potential of the second node B is Vref + | Vth |, in this process, the threshold voltage acquisition process of the driving module is completed, and at this time, the potential of the first node a is Vref; in the data writing stage, the data voltage Vdata is written into the second node B through the data writing module 107, that is, the potential of the second node B is changed from Vref + | Vth | to Vdata at this time, meanwhile, the first node a floats, the potential of the first node a is coupled by the coupling module 105, the voltage at two ends of the coupling module 105 cannot change suddenly, the voltage at two ends is | Vth | when the threshold compensation stage is completed, and the voltage at two ends is also | Vth | in the data writing stage, so that the potential of the first node a is changed from Vref to Vdata- | Vth |, thereby completing the data writing process of the data voltage Vdata; in the light emitting stage, the light emitting control module 109 connects the second power signal VDD2 to the driving module 101, the second power signal VDD2 and the third power signal VSS provide a current path for the driving module to work, the storage module 102 maintains the potential of the second node B, the driving module 101 generates a driving current according to the potential of the control end of the driving module, and the potential of the control end of the driving module is unrelated to the threshold voltage of the driving module; in addition, in this embodiment, the threshold voltage of the driving module is not acquired through the data signal Vdata which changes along with the display picture, but acquired through a fixed reference voltage Vref, when the display pictures are different, the reference voltage Vref does not change, that is, the effect of acquiring the threshold voltage of the driving module does not change, so that the fluctuation of the threshold voltage acquisition error of the driving module is greatly reduced, the problem of large fluctuation of the threshold voltage acquisition error of the driving module under different gray scales is solved, the defect of insufficient low gray scale compensation is overcome, and the display effect of the display panel is improved.
According to the technical scheme of the embodiment of the invention, the adopted pixel driving circuit comprises: the driving module is used for providing driving current to the light-emitting module, and the light-emitting module responds to the driving current; the first end of the storage module is connected with a first power supply signal; the first initialization module is used for writing a first power supply signal into the second end of the storage module in an initialization stage; the second end of the coupling module is electrically connected with the second end of the storage module, and the second end of the coupling module is electrically connected with the control end of the driving module; the threshold compensation module is used for electrically connecting the second end of the driving module with the control end of the driving module in a threshold compensation stage and writing a reference signal into the second end of the coupling module so as to control the potential of the first end of the coupling module; the potential writing module is used for writing the potential of the second end of the storage module into the first end of the driving module in the threshold compensation stage; and the data writing module is used for writing a data signal into the second end of the storage module in a data writing stage. In the threshold compensation stage, the threshold voltage of the driving module is not acquired through a data signal which can change along with a display picture, but acquired through a fixed reference voltage, when the display pictures are different, the reference voltage can not change, namely, the effect of acquiring the threshold voltage of the driving module can not change, so that the fluctuation of the threshold voltage acquisition error of the driving module is greatly reduced, the problem that the threshold voltage acquisition error of the driving module has larger fluctuation under different gray scales is solved, the defect of insufficient low-gray-scale compensation is overcome, and the display effect of the display panel is improved.
For example, in this embodiment, the driving module, the first initializing module, the potential writing module, the threshold compensation module, the data writing module, and the light emitting control module may include transistors, preferably P-type transistors, and the storage module and the coupling module may be capacitors.
It should be noted that, in the embodiment, the reference signal Vref and the first power signal VDD1 may both be adjustable voltages, and for example, may be set according to a maximum display gray scale of the display panel, so as to achieve a better acquisition effect and further achieve an optimal compensation effect. The first power signal VDD1 may be, for example, 4V, and the second power signal VDD2 may be, for example, 4.6V, in some other embodiments, the value of the first power signal VDD1 may be the same as the value of the second power signal VDD2, or the value of the first power signal VDD1 may be greater than the value of the second power signal VDD2, which is not specifically limited in this embodiment of the present invention.
Optionally, fig. 2 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 2, the threshold compensation module 106 includes: a first threshold compensation submodule 1061 and a second threshold compensation submodule 1062, wherein a first end of the first threshold compensation submodule 1061 is electrically connected to the light emitting module 108, a second end of the first threshold compensation submodule 1061 is electrically connected to a first end of the second threshold compensation submodule 1062, a second end of the second threshold compensation submodule 1062 is electrically connected to a control end of the driving module 101, and a first end of the second threshold compensation submodule 1062 is connected to the reference signal; the control terminals of the first threshold compensation sub-module 1061 and the second threshold compensation sub-module 1062 access the first scanning signal S1.
Specifically, the first threshold compensation sub-module 1061 can conduct its first terminal with its second terminal under the control of its control terminal control signal, and the second threshold compensation sub-module 1062 can conduct its first terminal with its second terminal under the control of its control terminal control signal; the first threshold compensation sub-module 1061 and the second threshold compensation sub-module 1062 may both be P-type transistors; in the threshold compensation stage, the first threshold compensation submodule and the second threshold compensation submodule are both conducted, so that the second end of the driving module 101 is conducted with the control end of the driving module 101, and the reference signal Vref is written into the second end of the coupling module 105; in addition, the threshold compensation module 106 is composed of a first threshold compensation submodule and a second threshold compensation submodule, and in the light emitting stage, the control end of the drive module and the light emitting module can be switched off to prevent the reference signal from being written in, so that the light emitting module can display the correct gray scale according to the data voltage.
Further, in this embodiment, as shown in fig. 3, fig. 3 is a timing diagram of a pixel driving circuit according to an embodiment of the invention, which may correspond to the pixel driving circuit in fig. 2, in conjunction with fig. 2 and 3, the driving process of the pixel driving circuit may be divided into four stages, namely an initialization stage T1, a threshold compensation stage T2, a data writing stage T3 and a light emitting stage T4, in the initialization stage T1, the first scan signal S1 controls the first threshold compensation submodule 1061 and the second threshold compensation submodule 1062 to be turned on, and the initialization signal Vref initializes the light emitting module 108 and the driving module 101, so as to prevent the residual potential of the previous frame from affecting the display of the current frame, meanwhile, the second scan signal S2 controls the first initialization module 103 to be turned on, and the first power signal VDD1 is written into the second end of the memory module 102, so as to facilitate the subsequent collection of the threshold voltage of the driving module; at the threshold compensation stage T2, the second scan signal S2 controls the first initialization module 103 to turn off, at this time, the first end of the storage module 102 is at the fixed potential VDD1, and the first scan signal S1 controls the first threshold compensation submodule 1061 and the second threshold compensation submodule 1062 to continue to turn on, so as to perform the threshold acquisition process of the driving module, where the specific acquisition method is as described above and is not described herein again; in the data writing stage T3, the first scanning signal S1 controls the first threshold compensation submodule 1061 and the second threshold compensation submodule 1062 to turn off, the second scanning signal S2 controls the first initialization module 103 to turn off, the third scanning signal S3 controls the data writing module 107 to turn on, the data voltage Vdata is written into the second end of the storage module, that is, the potential of the second end of the storage module at this time is changed from Vref + | Vth | into Vdata, and at the same time, the control end of the driving module floats, and the potential of the driving module is changed from Vref into Vdata- | Vth | under the coupling effect of the coupling module 105, thereby completing the data writing process of the data voltage Vdata; in the light-emitting period T4, the enable signal EM controls the light-emitting control module 109 to be turned on, so as to drive the light-emitting module 108 to emit light. In this embodiment, the first threshold compensation submodule 1061 and the second threshold compensation submodule 1062 may also be used as an initialization function in an initialization stage, and the initialization and threshold compensation functions may be completed by using fewer components, so as to facilitate layout design and improve the aperture ratio of the display panel.
Optionally, with reference to fig. 2, a first terminal of the potential writing module 104 is electrically connected to a second terminal of the memory module 102, a second terminal of the potential writing module 104 is electrically connected to a first terminal of the driving module 101, and a control terminal of the potential writing module 104 is connected to the first scanning signal S1; the first terminal of the first initialization module 103 is electrically connected to the first terminal of the memory module, the second terminal of the first initialization module 103 is electrically connected to the second terminal of the potential writing module 104, and the control terminal of the first initialization module 103 is connected to the second scan signal S2. In this embodiment, the second end of the first initialization module 103 is electrically connected to the second end of the potential writing module 104, that is, the first power signal VDD1 needs to pass through the first initialization module 103 and the potential writing module 104 before being written into the second end of the memory module 102 in the initialization stage, and the second end of the memory module 102 has fewer devices connected thereto, which is more convenient for wiring.
Alternatively, in some other embodiments, as shown in fig. 4, fig. 4 is a schematic circuit structure diagram of another pixel driving circuit provided in an embodiment of the present invention, and different from the pixel driving circuit shown in fig. 2, in this embodiment, a first end of the first initialization module 103 is electrically connected to a first end of the memory module 102, a second end of the first initialization module 103 is electrically connected to a second end of the memory module 102, and a control end of the first initialization module 103 is connected to the second scan signal S2. In this embodiment, the second end of the first initialization module 103 is directly electrically connected to the second end of the memory module 102, and the first power signal VDD1 can be written into the second end of the memory module 102 through the first initialization module 103, and there are fewer components passing through, which is beneficial to reducing the voltage drop when the first power signal VDD1 is written into the second end of the memory module 102, and improving the compensation effect.
Optionally, with continued reference to fig. 4, the pixel driving circuit further comprises: the second end of the potential writing module 104 is electrically connected to the second end of the driving module 101 through the writing control module 110, wherein the second end of the potential writing module 104 is electrically connected to the first end of the writing control module 110, the second end of the writing control module 110 is electrically connected to the first end of the driving module 101, and the writing control module 110 is configured to turn off at an initialization stage.
Specifically, the write control module 110 can turn on or off the first terminal and the second terminal thereof under the control of the fourth scan signal S4 accessed by the control terminal thereof, and the write control module 110 may be, for example, a transistor, preferably a P-type transistor; as shown in fig. 5, fig. 5 is a timing diagram of another pixel driving circuit according to an embodiment of the present invention, where fig. 5 may correspond to fig. 4, in this embodiment, by providing the write control module 110, the write control module 110 is turned off in the initialization phase T1, so as to avoid that the driving module 101 is in an operating state in the initialization phase, and ensure that the light emitting module does not emit light in the initialization phase, and at the same time, the write control module 110 is turned on in the threshold supplement phase T2, the data write phase T3, and the light emitting phase T4, so that the pixel driving circuit can operate normally.
Optionally, fig. 6 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 6, the pixel driving circuit further includes: a second initialization module 111, a first end of the second initialization module 111 is connected to the reference signal Vref, a second end of the second initialization module 111 is electrically connected to the light emitting module, a second end of the second initialization module 111 is connected to the second scanning signal S2, and the second initialization module 111 is configured to initialize the light emitting module 108 in an initialization stage; and/or, the third initialization module 112, a first end of the third initialization module 112 is connected to the reference signal Vref, a second end of the third initialization module 112 is electrically connected to the control end of the driving module 101, the control end of the third initialization module 112 is connected to the second scan signal S2, and the third initialization module 112 is configured to initialize the driving module 101 in the initialization stage.
Specifically, the second initialization module 111 can turn on or off the first terminal and the second terminal thereof under the control of the control terminal control signal, and the second initialization module 111 may be a transistor, preferably a P-type transistor; the third initialization module 112 is capable of turning on or off the first terminal and the second terminal under the control of the control terminal control signal, and the third initialization module 112 may be a transistor, preferably a P-type transistor; fig. 7 is a timing diagram of another pixel driving circuit according to an embodiment of the present invention, where fig. 7 corresponds to fig. 6, and with reference to fig. 7 and fig. 6, in this embodiment, the first threshold compensation submodule 1061 and the second threshold compensation submodule 1062 are both turned off during the initialization period T1, the driving module is initialized by the third initialization module 112, and the light emitting module 108 is initialized by the second initialization module 111, so that the first threshold compensation submodule 1061 and the second threshold compensation submodule 1062 are turned on only during the threshold compensation period, and the first initialization module 103, the second initialization module 111, and the third initialization module 112 are turned on only during the initialization period, so that the pulse widths of the first scan signal S1, the second scan signal S2, and the third scan signal S3 can all be the same, that is, the first scan signal S1, the second scan signal S2, and the third scan signal S3 can all be generated by the same scan driving circuit, therefore, the design difficulty of a scanning driving circuit in the display panel is greatly reduced, and the overall cost of the display panel is further reduced.
Optionally, with reference to fig. 6, the first terminal of the potential writing module 104 is electrically connected to the second terminal of the memory module 102, the second terminal of the potential writing module 104 is electrically connected to the first terminal of the driving module 101, and the control terminal of the potential writing module 104 is connected to the first scanning signal S1; the first terminal of the first initialization module 103 is electrically connected to the first terminal of the memory module 102, the second terminal of the first initialization module 103 is electrically connected to the second terminal of the memory module 102, and the control terminal of the first initialization module 103 is connected to the second scan signal S2.
Specifically, in the present embodiment, the potential writing module 104 may be turned on only in the threshold compensation stage and turned off in other stages, that is, the control terminal of the potential writing module 104 may access the first scan signal S1, while the first initialization module 103 is turned on only in the initialization stage and turned off in other stages, and since the first initialization module 103 needs to write the first power signal VDD1 into the second terminal of the memory module 102, the present embodiment may set the control terminal of the first initialization module 103 to access the first scan signal S1, and the second terminal of the first initialization module 103 is directly electrically connected to the second terminal of the memory module 102, so as to ensure that the first power signal VDD1 can be written into the second terminal of the memory module 102 in the initialization stage, and enable each module to be turned on only in one stage, that the pulse widths of the first scan signal S1, the second scan signal S2, and the third scan signal S3 are all the same, that is, the first scan signal S1, the second scan signal S2, and the third scan signal S3 can all be generated by the same scan driving circuit, so as to greatly reduce the design difficulty of the scan driving circuit in the display panel, and further reduce the overall cost of the display panel.
Fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 8, the embodiment of the present invention further provides a display panel including a plurality of scan lines (GL1-GLk) and the pixel driving circuit 100 according to any embodiment of the present invention.
Specifically, the display panel may include scan lines and data lines (DL1-DLn) that are staggered horizontally and vertically, the scan lines being used to provide corresponding first, second and third scan signals S1, S2 and S3, the scan lines being electrically connected to the scan driving circuit 30, the data lines being electrically connected to the data driving circuit 20, the display device may further include a light emission control signal generating circuit 40 and corresponding enable signal lines (EM1-EMk), the light emission control signal generating circuit 40 generating the enable signal in the embodiment of the present invention; the display panel may be, for example, a display panel on a mobile phone, a tablet, a display, an MP3, an MP4, a smart watch, a smart helmet, or other wearable devices, and therefore, the display panel includes the pixel driving circuit provided in any embodiment of the present invention, and therefore, the same advantageous effects are also provided, and details are not described herein again.
Fig. 9 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 9, the pixel driving circuit is a pixel driving circuit according to any embodiment of the present invention, and the driving method of the pixel driving circuit includes:
step S101, in an initialization stage, controlling a first initialization module to be conducted, and writing a first power supply signal into a second end of a storage module;
step S102, in the threshold compensation stage, the threshold compensation module and the potential writing module are conducted to capture the threshold voltage of the driving module, so that the driving current of the driving module is unrelated to the threshold voltage of the driving module;
step S103, in the data writing stage, the data writing module is turned on, and the data signal is written into the second end of the storage module.
For a specific driving process of the pixel driving circuit, reference may be made to the description of the pixel driving circuit according to the embodiment of the present invention, and details are not repeated herein.
According to the technical scheme, the driving method of the pixel driving circuit is adopted, in the threshold compensation stage, the threshold voltage of the driving module is not acquired through a data signal which can change along with a display picture, but acquired through a fixed reference voltage, when the display pictures are different, the reference voltage can not change, namely, the effect of acquiring the threshold voltage of the driving module can not change, so that the fluctuation of the threshold voltage acquisition error of the driving module is greatly reduced, the problem that the threshold voltage acquisition error of the driving module has larger fluctuation under different gray scales is solved, the defect of insufficient low-gray-scale compensation is overcome, and the display effect of the display panel is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A pixel driving circuit comprising a driving module for providing a driving current to a light emitting module, the light emitting module being responsive to the driving current, the pixel driving circuit further comprising:
the first end of the storage module is connected with a first power supply signal;
a first initialization module, configured to write the first power signal into a second end of the memory module in an initialization phase;
the first end of the coupling module is electrically connected with the second end of the storage module, and the second end of the coupling module is electrically connected with the control end of the driving module;
the threshold compensation module is used for conducting a second end of the driving module and a control end of the driving module in a threshold compensation stage and writing a reference signal into a second end of the coupling module so as to control the potential of the first end of the coupling module;
the potential writing module is used for writing the potential of the first end of the coupling module into the first end of the driving module in a threshold compensation stage;
and the data writing module is used for writing a data signal into the second end of the storage module in a data writing stage.
2. The pixel driving circuit according to claim 1, wherein the threshold compensation module comprises:
a first threshold compensation submodule and a second threshold compensation submodule, wherein a first end of the first threshold compensation submodule is electrically connected with the light emitting module, a second end of the first threshold compensation submodule is electrically connected with a first end of the second threshold compensation submodule, a second end of the second threshold compensation submodule is electrically connected with a control end of the driving module, and a first end of the second threshold compensation submodule is connected into the reference signal; and the control end of the first threshold compensation submodule and the control end of the second threshold compensation submodule are connected into a first scanning signal.
3. The pixel driving circuit according to claim 2, wherein the first threshold compensation submodule is further configured to be turned on during the initialization phase to initialize the light emitting module;
the second threshold compensation sub-module is further configured to conduct during the initialization phase to initialize the driving module.
4. The pixel driving circuit according to claim 3, wherein a first terminal of the potential writing module is electrically connected to a second terminal of the memory module, a second terminal of the potential writing module is electrically connected to the first terminal of the driving module, and a control terminal of the potential writing module is connected to the first scan signal;
the first end of the first initialization module is electrically connected with the first end of the storage module, the second end of the first initialization module is electrically connected with the second end of the potential writing module, and the control end of the first initialization module is connected with a second scanning signal;
or the first end of the first initialization module is electrically connected with the first end of the memory module, the second end of the first initialization module is electrically connected with the second end of the memory module, and the control end of the first initialization module is accessed to the second scanning signal.
5. The pixel driving circuit according to any one of claims 1 to 4, further comprising:
and the second end of the potential writing module is electrically connected with the first end of the driving module through the writing control module, the second end of the potential writing module is electrically connected with the first end of the writing control module, the second end of the writing control module is electrically connected with the first end of the driving module, and the writing control module is used for switching off at the initialization stage.
6. The pixel driving circuit according to claim 2, further comprising:
a second initialization module, a first end of which is connected to the reference signal, a second end of which is electrically connected to the light emitting module, a second end of which is connected to a second scanning signal, and which is used to initialize the light emitting module in the initialization stage;
and/or a third initialization module, a first end of the third initialization module being connected to the reference signal, a second end of the third initialization module being electrically connected to a control end of the driving module, the control end of the third initialization module being connected to a second scanning signal, the third initialization module being configured to initialize the driving module in the initialization stage.
7. The pixel driving circuit according to claim 6, wherein a first terminal of the potential writing module is electrically connected to a second terminal of the memory module, a second terminal of the potential writing module is electrically connected to the first terminal of the driving module, and a control terminal of the potential writing module is connected to the first scan signal;
the first end of the first initialization module is electrically connected with the first end of the storage module, the second end of the first initialization module is electrically connected with the second end of the storage module, and the control end of the first initialization module is connected to the second scanning signal.
8. The pixel driving circuit according to claim 1, further comprising:
and the first end of the light-emitting control module is connected with a second power supply signal, and the light-emitting control module is used for writing the second power supply signal into the first end of the driving module in a light-emitting stage.
9. A display panel comprising the pixel driving circuit according to any one of claims 1 to 8.
10. A driving method of a pixel driving circuit, wherein the pixel driving circuit comprises the pixel driving circuit according to any one of claims 1 to 9;
the driving method includes:
in an initialization stage, controlling the first initialization module to be conducted, and writing the first power supply signal into the second end of the storage module;
in a threshold compensation stage, the threshold compensation module and the potential writing module are conducted to capture the threshold voltage of the driving module, so that the driving current of the driving module is independent of the threshold voltage of the driving module;
and in the data writing stage, the data writing module is conducted and writes the data signal into the second end of the storage module.
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| CN114724508B (en) * | 2021-11-25 | 2023-04-07 | 云谷（固安）科技有限公司 | Pixel circuit, driving method thereof and display panel |
| CN113781964B (en) * | 2021-09-10 | 2023-01-06 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
| CN114023259B (en) * | 2021-12-01 | 2022-10-21 | 合肥维信诺科技有限公司 | Pixel driving circuit and driving method thereof |
| CN114241978A (en) * | 2021-12-21 | 2022-03-25 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
| CN114495822A (en) * | 2021-12-27 | 2022-05-13 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
| CN115240582B (en) * | 2022-09-23 | 2022-12-13 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
| CN116312333A (en) * | 2023-03-01 | 2023-06-23 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
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