CN111710297B - 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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- CN111710297B CN111710297B CN202010576087.2A CN202010576087A CN111710297B CN 111710297 B CN111710297 B CN 111710297B CN 202010576087 A CN202010576087 A CN 202010576087A CN 111710297 B CN111710297 B CN 111710297B
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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
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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
Abstract
The invention discloses a pixel driving circuit, a driving method thereof and a display panel. The first end of a first initialization module of the pixel driving circuit is electrically connected with an initialization signal end, the second end of the first initialization module of the pixel driving circuit is electrically connected with the first end of the storage module, and the control end of the first initialization module of the pixel driving circuit is electrically connected with a first scanning signal end; the first end of the second initialization module is electrically connected with the second end of the first initialization module, and the control end is electrically connected with the second scanning signal end; the first end of the data writing module is electrically connected with the data signal end, the second end of the data writing module is electrically connected with the control end of the driving module and the second end of the second initialization module, and the control end of the data writing module is electrically connected with the second scanning signal end; the light-emitting control module is connected between the second end of the storage module and the first power supply end, and the control end is electrically connected with the enable signal end; the control end of the threshold compensation module is electrically connected with the third scanning signal end, and the second end of the light-emitting module is electrically connected with the second power supply end. The driving current is independent of the threshold voltage in the embodiment of the invention.
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 application of display panels is more and more extensive, and the corresponding requirements on display panels are also higher and higher.
The conventional display panel generally drives the light emitting unit to emit light for display through the pixel driving circuit, however, the conventional pixel driving circuit may cause a problem of threshold voltage shift, which affects the display effect.
Disclosure of Invention
The invention provides a pixel driving circuit, a driving method thereof and a display panel.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, where the pixel driving circuit includes: the device comprises a data writing module, a driving module, a light emitting control module, a threshold compensation module, a first initialization module, a second initialization module, a storage module and a light emitting module; the first end of the first initialization module is electrically connected with an initialization signal end, the second end of the first initialization module is electrically connected with the first end of the storage module, and the control end of the first initialization module is electrically connected with a first scanning signal end; the first end of the second initialization module is electrically connected with the second end of the first initialization module, and the control end of the second initialization module is electrically connected with the second scanning signal end; the first end of the data writing module is electrically connected with the data signal end, the second end of the data writing module is electrically connected with the control end of the driving module and the second end of the second initialization module, and the control end of the data writing module is electrically connected with the second scanning signal end; the conduction levels of the data writing module and the second initialization module are opposite; the light-emitting control module is connected between the second end of the storage module and a first power supply end, and the control end of the light-emitting control module is electrically connected with an enable signal end; the driving module and the threshold compensation module are connected in series to form a series structure, a first end of the series structure is electrically connected with a second end of the storage module, a second end of the series structure is electrically connected with a first end of the light-emitting module, a control end of the threshold compensation module is electrically connected with a third scanning signal end, and a second end of the light-emitting module is electrically connected with a second power supply end.
Optionally, a first end of the threshold compensation module serves as a first end of the series structure, a second end of the threshold compensation module is electrically connected to a first end of the driving module, and a second end of the driving module serves as a second end of the series structure; or, the first end of the driving module is used as the first end of the series structure, the second end of the driving module is electrically connected with the first end of the threshold compensation module, and the second end of the threshold compensation module is used as the second end of the series structure.
Optionally, the data voltage Vdata input by the data signal terminal, the first power voltage Vdd input by the first power terminal and the threshold voltage Vth of the driving module satisfy the following relationship: Vdata-Vth < Vdd.
Optionally, the first initialization module includes a first transistor, a first terminal of the first transistor is used as the first terminal of the first initialization module, a second terminal of the first transistor is used as the second terminal of the first initialization module, and a control terminal of the first transistor is used as the control terminal of the first initialization module.
Optionally, the second initialization module includes a second transistor, a first end of the second transistor is used as a first end of the second initialization module, a second end of the second transistor is used as a second end of the second initialization module, and a control end of the second transistor is used as a control end of the second initialization module; the data writing module comprises a third transistor, wherein a first end of the third transistor is used as a first end of the data writing module, a second end of the third transistor is used as a second end of the data writing module, and a control end of the third transistor is used as a control end of the data writing module; the second transistor is of a different transistor type than the third transistor.
Optionally, the light-emitting control module includes a fourth transistor, a first end of the fourth transistor is used as the first end of the light-emitting control module, a second end of the fourth transistor is used as the second end of the light-emitting control module, and a control end of the fourth transistor is used as the control end of the light-emitting control module.
Optionally, the threshold compensation module includes a fifth transistor, a first terminal of the fifth transistor is used as the first terminal of the threshold compensation module, a second terminal of the fifth transistor is used as the second terminal of the threshold compensation module, and a control terminal of the fifth transistor is used as the control terminal of the threshold compensation module.
Optionally, the driving module includes a sixth transistor, a first end of the sixth transistor is used as the first end of the driving module, a second end of the sixth transistor is used as the second end of the driving module, and a control end of the sixth transistor is used as the control end of the driving module.
In a second aspect, an embodiment of the present invention further provides a driving method for a pixel driving circuit, for driving the pixel driving circuit in the first aspect, where the method includes: in an initialization stage, the first initialization module, the data writing module and the light-emitting control module are switched on, the second initialization module, the threshold compensation module and the driving module are switched off, an initialization signal is written into a first end of the storage module, a data signal is written into a control end of the driving module, and a first power signal is written into a second end of the storage module; in a threshold compensation stage, the first initialization module, the threshold compensation module and the data writing module are switched on, the driving module is switched on, the light-emitting control module is switched off, and the potential of a first end of the driving module drops to the point that the driving module is switched off; in a reset stage, the first initialization module and the second initialization module are conducted, and the initialization signal is written into the first end of the storage module and the control end of the driving module; in a light emitting stage, the second initialization module, the light emitting control module, the driving module and the threshold compensation module are turned on, and the driving module drives the light emitting module to emit light.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel driving circuit described in the first aspect.
According to the technical scheme of the embodiment of the invention, the adopted pixel driving circuit comprises a data writing module, a driving module, a light emitting control module, a threshold compensation module, a first initialization module, a second initialization module, a storage module and a light emitting module; the driving current of the driving module in the pixel driving circuit is irrelevant to the threshold voltage of the driving module, the influence of threshold voltage drift is avoided, the light emitting is stable, and the electric potential of the control end of the driving module does not jump in the light emitting stage, so that the light emitting stability is further 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 timing diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 3 is a schematic circuit diagram of another 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 flowchart of a driving method of a pixel driving circuit according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present 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.
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: a data writing module 101, a driving module 102, a light emitting control module 103, a threshold compensation module 104, a first initialization module 105, a second initialization module 106, a storage module 107, and a light emitting module 108; a first terminal of the first initialization module 105 is electrically connected to the initialization signal terminal Vref, a second terminal of the first initialization module 105 is electrically connected to a first terminal of the memory module 107, and a control terminal of the first initialization module 105 is electrically connected to the first Scan signal terminal Scan 1; a first end of the second initialization module 106 is electrically connected to a second end of the first initialization module 105, and a control end of the second initialization module 106 is electrically connected to the second Scan signal terminal Scan 2; a first end of the Data writing module 101 is electrically connected to the Data signal end Data, a second end of the Data writing module 101 is electrically connected to a control end of the driving module 102 and a second end of the second initialization module 106, and a control end of the Data writing module 101 is electrically connected to the second Scan signal end Scan 2; the conduction levels of the data writing module 101 and the second initialization module 106 are opposite; the light-emitting control module 103 is connected between the second end of the storage module 107 and the first power end VDD, and the control end of the light-emitting control module 103 is electrically connected with the enable signal end EM; the driving module 102 and the threshold compensation module 104 are connected in series to form a series structure 10, a first end of the series structure 10 is electrically connected to a second end of the memory module 107, a second end of the series structure 10 is electrically connected to a first end of the light emitting module 108, a control end of the threshold compensation module 104 is electrically connected to the third Scan signal terminal Scan3, and a second end of the light emitting module 108 is electrically connected to the second power source terminal VSS.
Specifically, the Light Emitting module 108 may be, for example, an Organic Light-Emitting Diode (OLED), the OLED is a current-type device and can emit Light only under the action of a driving current, and the driving module 102 can generate a corresponding driving current according to a Data signal input by the Data signal terminal Data to drive the Light Emitting module to display different gray scales. The first power terminal VDD and the second power terminal VSS input voltages having different high and low levels, typically, the first power terminal VDD inputs a high level, and the second power terminal VSS inputs a low level, so as to provide a current path required for the light emitting module 108 to emit light during the light emitting period; the first Scan signal terminal Scan1, the second Scan signal terminal Scan2 and the third Scan signal terminal Scan3 can be electrically connected to the corresponding Scan lines to provide corresponding Scan signals; fig. 2 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention, which may correspond to the pixel driving circuit shown in fig. 1, and the pixel driving circuit according to an embodiment of the present invention is described in detail with reference to fig. 1 and fig. 2; in this embodiment, the on level of the second initialization module 106 is a high level, and the on levels of the data writing module 101, the driving module 102, the light emitting control module 103, the threshold compensation module 104 and the first initialization module 105 are low levels, for example, in some other embodiments, the on level types of the modules may be opposite to the level of this embodiment;
in the initialization stage T1, the input signals of the first Scan signal terminal Scan1 and the second Scan signal terminal Scan2 are at a low level, the input signals of the third Scan signal terminal Scan3 and the enable signal terminal EM are at a high level, that is, the first initialization module 105, the light-emitting control module 103 and the Data write module 101 are turned on, the second initialization module 106, the threshold compensation module 104 and the driving module 102 are turned off, the voltage signal of the first power terminal VDD is written into the node B, that is, the second terminal of the memory module 107, the voltage signal of the initialization signal terminal VREF is written into the node a, that is, the first terminal of the memory module 107, the Data signal of the Data signal terminal Data is written into the node G, that is, the control terminal of the driving module 102, the voltage of the first power terminal VDD is set to be VDD, the voltage of the initialization signal terminal VREF is set to be VREF, the voltage of the Data signal terminal Data is Vdata, the potential of the node a is set to be VREF at this time, the potential of the node B is Vdd, and the potential of the node G is Vdata;
in the threshold compensation stage T2, the input signals of the first Scan signal terminal Scan1, the second Scan signal terminal Scan2 and the third Scan signal terminal Scan3 are at a low level, the input signal of the enable signal terminal EM is at a high level, at this time, the first initialization module 105, the data write module 101 and the threshold compensation module 104 are turned on, the light-emitting control module 103 and the second initialization module 106 are turned off, the node G write potential is Vdata, the potential of the node B is written into the node S, i.e., the potential of the node S is Vdd, at this time, the driving module 102 is turned on under the action of the potentials of the node G and the node S, and at the same time, due to the conduction between the node B and the second power terminal VSS, the second power terminal VSS pulls down the potential of the node B until the potential of the node B is Vdata-Vth, wherein Vth is the threshold voltage of the driving module 102, at this time, the driving module 102 is turned off, the potential of the node B does not drop any more, and the threshold compensation stage T2 finally makes the potential of the node B be Vdata-Vth, the potential of the node A is Vref, and the potential of the node G is Vdata; it should be noted that, although the driving module 102 is turned on, since the light-emitting control module 103 is turned off, no current flows in the light-emitting module 108, and light is not emitted;
at the reset stage T3, the input signal of the first Scan signal terminal Scan1 is at a low level, the input signals of the second Scan signal terminal Scan2, the third Scan signal terminal Scan3 and the enable signal terminal EM are at a high level, that is, the first initialization module 105 and the second initialization module 106 are turned on, the data write module 101, the threshold compensation module 104 and the light-emitting control module 103 are turned off, and the initialization signal Vref is written into the node a and the node G, in other words, the first terminal of the storage module 107 and the control terminal of the driving module 102 have the same potential and are both Vref; it should be noted that, although the driving module 102 is also turned on, the light-emitting control module 103 is turned off, and no current flows in the light-emitting module 108, and light is still not emitted;
in the light emitting period T4, the input signals of the first Scan signal terminal Scan1, the second Scan signal terminal Scan2 are at a high level, the input signals of the third Scan signal terminal Scan3 and the enable signal terminal EM are at a low level, at this time, the light emission control module EM, the threshold compensation module 104, the second initialization module 106 and the driving module 102 are turned on, the first initialization module 105 and the data writing module 101 are turned off, the potential of the second terminal (node B) of the storage module 107 is jumped from Vdata-Vth to Vdd, and since the voltage difference between the two terminals of the storage module 107 (for example, the storage module 107 adopts a capacitor) cannot be changed suddenly, the potential difference Δ Vdd-Vdata + Vth between the first terminal and the second terminal of the storage module 107 is in the threshold compensation period T3, and the potential between the node a and the node G is Vref + Δ Vth + Vdd-Vdata + Vth in the light emitting period T4; since the driving current I of the driving module 102 is K (Vgs-Vth), where K is a constant related to the driving module 102 and Vgs is a potential difference between the control terminal and the first terminal of the driving module, I is K (Vref + Vdd-Vdata + Vth-Vdd-Vth) ═ K (Vref-Vdata), i.e., the driving current of the driving module 102 is independent of the threshold voltage of the driving module 102.
In this embodiment, the reset period T3 is set to ensure that the control end potential of the driving module 102 does not jump, so that the light emitting module emits light more stably. If the reset phase T3 is not provided, the threshold compensation phase T2 is the light emitting phase T4 directly after the threshold compensation phase T2 because the node G is Vdata, at this time, because the data writing module 101 is turned off, the Vdata potential of the node G is a passive signal and cannot be kept in a stable state, and because of the effect of leakage current and the like, the potential of the node G cannot be determined when the threshold compensation phase T2 and the light emitting phase T4 are switched, and further the potential of the node G cannot be determined at the initial time of the light emitting phase T4, which may cause unstable light emission. By setting the reset period T3, the control terminal of the driving module 102 is reset to the same potential as the first terminal of the memory module 107 during the reset period T3, and the potential of the control terminal of the driving module 102 can be kept stable during the initial period of the light emitting period T4, thereby improving the stability of light emission.
In the technical scheme of this embodiment, the adopted pixel driving circuit includes a data writing module, a driving module, a light emitting control module, a threshold compensation module, a first initialization module, a second initialization module, a storage module and a light emitting module; the driving current of the driving module in the pixel driving circuit is irrelevant to the threshold voltage of the driving module, the influence of threshold voltage drift is avoided, the light emitting is stable, and the electric potential of the control end of the driving module does not jump in the light emitting stage, so that the light emitting stability is further improved.
Optionally, with continued reference to fig. 1, a first end of the threshold compensation module 104 serves as a first end of the series structure 10, a second end of the threshold compensation module 104 is electrically connected to a first end of the driving module 102, and a second end of the driving module 102 serves as a second end of the series structure 10;
alternatively, fig. 3 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 3, a first end of the driving module 102 is used as a first end of the series structure 10, a second end of the driving module 102 is electrically connected to a first end of the threshold compensation module 104, and a second end of the threshold compensation module 104 is used as a second end of the series structure 10.
Specifically, in the present embodiment, the threshold compensation module 104 may be connected between the driving module 102 and the first end of the memory module 107, i.e. the structure shown in fig. 1, or may be connected between the driving module 102 and the first end of the light emitting module 108, i.e. the structure shown in fig. 3, as long as the second end of the memory module 107 and the second power source terminal VSS can be conducted in the threshold compensation phase T2, so that the potential of the first end of the memory module 107 can be pulled down, and the function of threshold compensation can be completed.
Optionally, the Data voltage Vdata input by the Data signal terminal Data, the first power voltage VDD input by the first power terminal VDD, and the threshold voltage Vth of the driving module 102 satisfy the following relationship: Vdata-Vth < Vdd. The data voltage Vdata has a plurality of values corresponding to different gray scales, and all the data voltages Vdata can be set to satisfy Vdata-Vth < Vdd in this embodiment, so that the driving module 102 can be normally turned on.
Optionally, referring to fig. 4, the first initialization module 105 includes a first transistor T1, a first terminal of the first transistor T1 is used as a first terminal of the first initialization module 105, a second terminal of the first transistor T1 is used as a second terminal of the first initialization module 105, and a control terminal of the first transistor T1 is used as a control terminal of the first initialization module 105 according to a circuit configuration diagram of a further pixel driving circuit provided in an embodiment of the invention. The transistor has the advantages of simple structure, easy manufacture, mature processes such as thin film transistors and the like in the field of display panels, good switching characteristics, contribution to reducing the manufacturing cost of the pixel driving circuit and ensuring the working stability of the pixel driving circuit.
Optionally, with continued reference to fig. 4, the second initialization module 106 includes a second transistor T2, a first terminal of the second transistor T2 is used as the first terminal of the second initialization module 106, a second terminal of the second transistor T2 is used as the second terminal of the second initialization module 106, and a control terminal of the second transistor T2 is used as the control terminal of the second initialization module 106; the data writing module 101 comprises a third transistor T3, a first terminal of the third transistor T3 is used as a first terminal of the data writing module 101, a second terminal of the third transistor T3 is used as a second terminal of the data writing module 101, and a control terminal of the third transistor T3 is used as a control terminal of the data writing module T3; the second transistor T2 is of a different transistor type than the third transistor T3.
Specifically, when the pixel driving circuit is in operation, the data writing module 101 and the second initializing module 106 are turned on at any time, that is, the second initializing module 106 is turned off when the data writing module 101 is turned on, and the second initializing module 106 is turned on when the data writing module 101 is turned off, so that the second transistor T2 and the third transistor T3 are different types of transistors, for example, when the second transistor T2 is an N-type transistor, the third transistor T3 is a P-type transistor, and when the second transistor T2 is a P-type transistor, the third transistor T3 is an N-type transistor, and at this time, the second transistor T2 and the third transistor T3 can provide a Scan signal from one Scan signal terminal (the second Scan signal terminal Scan2), thereby simplifying the circuit structure, reducing the number of Scan lines in the display panel, and reducing the difficulty of wiring of the display panel.
Alternatively, with continued reference to fig. 4, the light emission control module 103 includes a fourth transistor T4, a first terminal of the fourth transistor T4 serves as a first terminal of the light emission control module 103, a second terminal of the fourth transistor T4 serves as a second terminal of the light emission control module 103, and a control terminal of the fourth transistor T4 serves as a control terminal of the light emission control module 103. The transistor has the advantages of simple structure, easy manufacture and the like, thereby being beneficial to reducing the cost of the pixel drive circuit. Illustratively, the storage module may be a capacitor, and the light emitting module may be an OLED.
Optionally, with continued reference to fig. 4, the threshold compensation module 104 includes a fifth transistor T5, a first terminal of the fifth transistor T5 is used as the first terminal of the threshold compensation module 104, a second terminal of the fifth transistor T5 is used as the second terminal of the threshold compensation module 104, and a control terminal of the fifth transistor T5 is used as the control terminal of the threshold compensation module 104. The driving module 102 includes a sixth transistor T6, a first terminal of the sixth transistor T6 is a first terminal of the driving module 102, a second terminal of the sixth transistor T6 is a second terminal of the driving module 102, and a control terminal of the sixth transistor T6 is a control terminal of the driving module 102. The sixth transistor T6 is a driving transistor, and the other transistors are switching transistors, the transistors have the advantages of mature process, easy manufacturing, good working stability, etc., and the transistors can also be oxide thin film transistors, etc., to reduce leakage current and further improve the working stability of the pixel driving circuit.
Fig. 5 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 5, the driving method includes:
step S201, in an initialization stage, a first initialization module, a data writing module and a light-emitting control module are switched on, a second initialization module, a threshold compensation module and a driving module are switched off, a first end of a storage module writes an initialization signal, a control end of the driving module writes a data signal, and a second end of the storage module writes a first power supply signal;
step S202, in the threshold compensation stage, the first initialization module, the threshold compensation module and the data writing module are conducted, the driving module is conducted, the light-emitting control module is turned off, and the potential of the first end of the driving module is reduced to the point that the driving module is turned off;
step S203, in the reset stage, the first initialization module and the second initialization module are conducted, and the first end of the storage module and the control end of the driving module are both written with initialization signals;
step S204, in the light-emitting stage, the second initialization module, the light-emitting control module, the driving module and the threshold compensation module are conducted, and the driving module drives the light-emitting module to emit light.
For a specific working process of the driving method of this embodiment, reference may be made to the description of the pixel driving circuit portion in this embodiment of the present invention, and details are not repeated here. The driving current of the driving module in the pixel driving circuit is irrelevant to the threshold voltage of the driving module, the influence of threshold voltage drift is avoided, the light emitting is stable, and the electric potential of the control end of the driving module does not jump in the light emitting stage, so that the light emitting stability is further improved.
Fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 6, the display panel includes a plurality of pixel driving circuits PX according to any embodiment of the present invention, the display panel may include a plurality of criss-cross scan lines (S1-Sk) and data lines (DL 1-DLj), the pixel driving circuits are located in a region defined by the scan lines and the data lines, and the scan lines may include, for example, a first scan line, a second scan line, and a third scan line, which are respectively electrically connected to a first scan signal terminal, a second scan signal terminal, and a third scan signal terminal of the pixel driving circuits, so as to provide scan signals for the pixel driving circuits PX. The pixel driving circuit provided by any embodiment of the invention has the same beneficial effects, and is not described in detail herein.
Fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 7, the display device includes a display panel according to any embodiment of the present invention, and the display device may be a mobile phone, a tablet, a display, a smart watch, an MP3, an MP4, or other wearable devices.
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: the device comprises a data writing module, a driving module, a light emitting control module, a threshold compensation module, a first initialization module, a second initialization module, a storage module and a light emitting module;
the first end of the first initialization module is electrically connected with an initialization signal end, the second end of the first initialization module is electrically connected with the first end of the storage module, and the control end of the first initialization module is electrically connected with a first scanning signal end; the first end of the second initialization module is electrically connected with the second end of the first initialization module, and the control end of the second initialization module is electrically connected with the second scanning signal end;
the first end of the data writing module is electrically connected with the data signal end, the second end of the data writing module is electrically connected with the control end of the driving module and the second end of the second initialization module, and the control end of the data writing module is electrically connected with the second scanning signal end; the conduction levels of the data writing module and the second initialization module are opposite;
the light-emitting control module is connected between the second end of the storage module and a first power supply end, and the control end of the light-emitting control module is electrically connected with an enable signal end;
the driving module and the threshold compensation module are connected in series to form a series structure, a first end of the series structure is electrically connected with a second end of the storage module, a second end of the series structure is electrically connected with a first end of the light-emitting module, a control end of the threshold compensation module is electrically connected with a third scanning signal end, and a second end of the light-emitting module is electrically connected with a second power supply end;
the driving phase of the pixel driving circuit comprises an initialization phase, a threshold compensation phase, a reset phase and a light emitting phase;
the first initialization module is used for conducting in the initialization phase, the threshold compensation phase and the reset phase; the second initialization module is used for being turned off in the initialization stage and being turned on in the reset stage and the light-emitting stage; the first initialization module is used for writing an initialization signal into the second initialization module and the storage module in the reset phase, and the second initialization module is used for writing the initialization signal into the control end of the driving module in the reset phase;
the data writing module is used for conducting in the initialization stage and the threshold compensation stage;
the light-emitting control module is used for being switched on in the initialization stage and the light-emitting stage and being switched off in the threshold compensation stage;
the driving module is used for being turned off in the initialization stage and being turned on in the light-emitting stage; the threshold compensation module is used for being turned off in the initialization stage and being turned on in the threshold compensation stage and the light-emitting stage.
2. The pixel driving circuit according to claim 1,
a first end of the threshold compensation module is used as a first end of the series structure, a second end of the threshold compensation module is electrically connected with a first end of the driving module, and a second end of the driving module is used as a second end of the series structure;
or, the first end of the driving module is used as the first end of the series structure, the second end of the driving module is electrically connected with the first end of the threshold compensation module, and the second end of the threshold compensation module is used as the second end of the series structure.
3. The pixel driving circuit according to claim 1, wherein the data voltage Vdata inputted from the data signal terminal, the first power voltage Vdd inputted from the first power terminal and the threshold voltage Vth of the driving module satisfy the following relationship:
Vdata-Vth<Vdd。
4. the pixel driving circuit according to claim 1, wherein the first initialization module comprises a first transistor, a first terminal of the first transistor is used as the first terminal of the first initialization module, a second terminal of the first transistor is used as the second terminal of the first initialization module, and a control terminal of the first transistor is used as the control terminal of the first initialization module.
5. The pixel driving circuit according to claim 1, wherein the second initialization module comprises a second transistor, a first terminal of the second transistor is used as the first terminal of the second initialization module, a second terminal of the second transistor is used as the second terminal of the second initialization module, and a control terminal of the second transistor is used as the control terminal of the second initialization module;
the data writing module comprises a third transistor, wherein a first end of the third transistor is used as a first end of the data writing module, a second end of the third transistor is used as a second end of the data writing module, and a control end of the third transistor is used as a control end of the data writing module;
the second transistor is of a different transistor type than the third transistor.
6. The pixel driving circuit according to claim 1, wherein the light emission control module comprises a fourth transistor, a first terminal of the fourth transistor is used as the first terminal of the light emission control module, a second terminal of the fourth transistor is used as the second terminal of the light emission control module, and a control terminal of the fourth transistor is used as the control terminal of the light emission control module.
7. The pixel driving circuit according to claim 1, wherein the threshold compensation module comprises a fifth transistor, a first terminal of the fifth transistor is used as the first terminal of the threshold compensation module, a second terminal of the fifth transistor is used as the second terminal of the threshold compensation module, and a control terminal of the fifth transistor is used as the control terminal of the threshold compensation module.
8. The pixel driving circuit according to claim 1, wherein the driving module comprises a sixth transistor, a first terminal of the sixth transistor is used as the first terminal of the driving module, a second terminal of the sixth transistor is used as the second terminal of the driving module, and a control terminal of the sixth transistor is used as the control terminal of the driving module.
9. A method of driving a pixel drive circuit, the method being for driving the pixel drive circuit according to any one of claims 1 to 8, the method comprising:
in an initialization stage, the first initialization module, the data writing module and the light-emitting control module are switched on, the second initialization module, the threshold compensation module and the driving module are switched off, an initialization signal is written into a first end of the storage module, a data signal is written into a control end of the driving module, and a first power signal is written into a second end of the storage module;
in a threshold compensation stage, the first initialization module, the threshold compensation module and the data writing module are switched on, the driving module is switched on, the light-emitting control module is switched off, and the potential of a first end of the driving module drops to the point that the driving module is switched off;
in a reset stage, the first initialization module and the second initialization module are conducted, and the initialization signal is written into the first end of the storage module and the control end of the driving module;
in a light emitting stage, the second initialization module, the light emitting control module, the driving module and the threshold compensation module are turned on, and the driving module drives the light emitting module to emit light.
10. A display panel comprising the pixel drive circuit according to any one of claims 1 to 8.
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| CN113808521B (en) * | 2021-09-22 | 2024-01-16 | 昆山国显光电有限公司 | Pixel circuit, display panel and driving method of pixel circuit |
| 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 |
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| KR102524459B1 (en) * | 2015-08-27 | 2023-04-25 | 삼성디스플레이 주식회사 | Pixel and driving method thereof |
| CN106856087B (en) * | 2015-12-07 | 2019-03-08 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit and its driving method and organic light emitting display |
| CN107945737B (en) * | 2017-11-27 | 2020-01-31 | 合肥京东方光电科技有限公司 | Pixel compensation circuit, driving method thereof, display panel and display device |
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