CN113707089B - Pixel driving circuit, display panel and display device - Google Patents
Pixel driving circuit, display panel and display device Download PDFInfo
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- CN113707089B CN113707089B CN202111025415.0A CN202111025415A CN113707089B CN 113707089 B CN113707089 B CN 113707089B CN 202111025415 A CN202111025415 A CN 202111025415A CN 113707089 B CN113707089 B CN 113707089B
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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
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a pixel driving circuit, a display panel and a display device. The pixel driving circuit comprises a driving module and a driving module, wherein the driving module is used for generating driving current according to data voltage; the light-emitting module is used for responding to the driving current to display the brightness to be displayed; the data writing module is used for writing the data voltage into the first end of the driving module; the threshold compensation module is used for grabbing the threshold voltage of the driving module to the control end of the driving module; a first storage module; the first end of the second storage module is electrically connected with the control end of the data writing module, and the second end of the second storage module is electrically connected with the control end of the driving module; the threshold compensation module comprises a first compensation transistor and a second compensation transistor which are connected in series between the second end of the driving module and the control end of the driving module, and the transistor types of the first compensation transistor and the second compensation transistor are different. The invention achieves the effects of reducing the leakage current of the pixel driving circuit and maintaining the grid voltage of the driving transistor.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel driving circuit, a display panel and a display device.
Background
With the development of display technology, display panels are increasingly widely used, and corresponding requirements on the display panels are also increasing.
The current leakage current of the transistor of the existing display panel is larger, the grid voltage of the driving transistor cannot be maintained, and the brightness to be displayed cannot be well displayed.
Disclosure of Invention
The invention provides a pixel driving circuit, a display panel and a display device, which are used for reducing leakage current of a transistor of the display panel, maintaining grid voltage of the driving transistor and better displaying brightness to be displayed.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, including:
the driving module is used for generating driving current according to the data voltage;
the light-emitting module is used for responding to the driving current to display the brightness to be displayed;
the first end of the data writing module is connected with the data voltage, the second end of the data writing module is electrically connected with the first end of the driving module, and the data writing module is used for writing the data voltage into the first end of the driving module;
the threshold compensation module is used for grabbing the threshold voltage of the driving module to the control end of the driving module;
the first end of the first storage module is connected with a first power supply signal, and the second end of the first storage module is electrically connected with the control end of the driving module;
the first end of the second storage module is electrically connected with the control end of the data writing module, and the second end of the second storage module is electrically connected with the control end of the driving module;
the threshold compensation module comprises a first compensation transistor and a second compensation transistor which are connected in series between the second end of the driving module and the control end of the driving module, and the transistor types of the first compensation transistor and the second compensation transistor are different.
Optionally, the pixel driving circuit further includes a first initialization module and a second initialization module;
the first initialization module is used for initializing the driving module;
the second initialization module is used for initializing the light emitting module.
Optionally, the control end of the first compensation transistor is connected to a first scanning signal, the first end of the first compensation transistor is electrically connected to the first end of the second compensation transistor, the second end of the first compensation transistor is electrically connected to the second end of the driving module, the control end of the second compensation transistor is connected to a second scanning signal, and the second end of the second compensation transistor is electrically connected to the control end of the driving module; the first compensation transistor is a metal oxide transistor, and the second compensation transistor is a polysilicon transistor;
the control end of the first initialization module is connected with a fourth scanning signal, the first end of the first initialization module is connected with a reference signal, and the second end of the first initialization module is electrically connected with the first end of the second compensation transistor.
Optionally, the control end of the first compensation transistor is connected to a first scanning signal, the first end of the first compensation transistor is electrically connected to the control end of the driving module, the second end of the first compensation transistor is electrically connected to the second end of the second compensation transistor, the control end of the second compensation transistor is connected to a third scanning signal, and the first end of the second compensation transistor is electrically connected to the second end of the driving module; the first compensation transistor is a metal oxide transistor, and the second compensation transistor is a polysilicon transistor;
the control end of the first initialization module is connected with a fourth scanning signal, the first end of the first initialization module is connected with a reference signal, and the second end of the first initialization module is electrically connected with the second end of the second compensation transistor.
Optionally, the first initialization module and/or the second initialization module is a metal oxide transistor.
Optionally, the pixel driving circuit further includes a first light emitting control module and a second light emitting control module;
the control end of the data writing module is connected with a third scanning signal;
the control end of the second initialization module is connected with a fourth scanning signal, the first end of the second initialization module is connected with a reference signal, and the second end of the second initialization module is electrically connected with the first end of the light-emitting module;
the control end of the first light-emitting control module is connected with an enabling signal, the first end of the first light-emitting control module is connected with a first power signal, and the second end of the first light-emitting control module is electrically connected with the first end of the driving module; the control end of the second light-emitting control module is connected with the enabling signal, the first end of the second light-emitting control module is electrically connected with the second end of the driving module, the second end of the second light-emitting control module is electrically connected with the first end of the light-emitting module, and the second end of the light-emitting module is connected with a second power supply signal.
Optionally, the driving module includes a third transistor, a control end of the third transistor is a control end of the driving module, a first end of the third transistor is a first end of the driving module, and a second end of the third transistor is a second end of the driving module;
the first initialization module comprises a fourth transistor, the control end of the fourth transistor is the control end of the first initialization module, the first end of the fourth transistor is the first end of the first initialization module, and the second end of the fourth transistor is the second end of the first initialization module;
the second initialization module comprises a fifth transistor, the control end of the fifth transistor is the control end of the second initialization module, the first end of the fifth transistor is the first end of the second initialization module, and the second end of the fifth transistor is the second end of the second initialization module;
the data writing module comprises a sixth transistor, wherein the control end of the sixth transistor is the control end of the data writing module, the first end of the sixth transistor is the first end of the data writing module, and the second end of the sixth transistor is the second end of the data writing module;
the first light emitting control module comprises a seventh transistor, the control end of the seventh transistor is the control end of the first light emitting control module, the first end of the seventh transistor is the first end of the first light emitting control module, and the second end of the seventh transistor is the second end of the first light emitting control module;
the second light-emitting control module comprises an eighth transistor, the control end of the eighth transistor is the control end of the second light-emitting control module, the first end of the eighth transistor is the first end of the second light-emitting control module, and the second end of the eighth transistor is the second end of the second light-emitting control module;
the first storage module comprises a first capacitor, a first end of the first capacitor is a first end of the first storage module, and a second end of the first capacitor is a second end of the first storage module;
the second storage module comprises a second capacitor, a first end of the second capacitor is a first end of the second storage module, and a second end of the second capacitor is a second end of the second storage module;
the light emitting module comprises an organic light emitting diode, wherein a first end of the organic light emitting diode is a first end of the light emitting module, and a second end of the organic light emitting diode is a second end of the light emitting module.
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 any of the first aspects.
Optionally, the display panel substrate, the active layer, the gate metal layer, the source drain metal layer and the power supply metal layer;
the first polar plate of the first storage module is positioned on the source-drain metal layer, the first polar plate of the first storage module is used as the second end of the first storage module, the second polar plate of the first storage module is positioned on the power supply metal layer, and the second polar plate of the first storage module is used as the first end of the first storage module;
the first polar plate of the first storage module is multiplexed to the first polar plate of the second storage module, the second polar plate of the second storage module is located in the gate metal layer, and the second polar plate of the second storage module serves as the second end of the second storage module.
In a third aspect, an embodiment of the present invention further provides a display device, which is characterized by including the display panel according to any of the second aspects.
The pixel driving circuit comprises a driving module, a light emitting module, a data writing module, a threshold compensation module, a first storage module and a second storage module, wherein the first storage module can maintain the voltage of the control end of the driving module, the first end of the second storage module is electrically connected with the control end of the data writing module, and the second end of the second storage module is electrically connected with the control end of the driving module, so that when the threshold compensation module is closed, the second storage module can further maintain the voltage of the control end of the driving module, and the situation that the voltage of the control end of the driving module is pulled down due to the opening or closing of the threshold compensation module is avoided. Moreover, the voltage of the control end of the driving module is pulled up, so that the voltage of the first end of the driving module is reduced, the voltage of the second end of the driving module is reduced, and the power consumption of the light emitting module is reduced. The threshold compensation module comprises a first compensation transistor and a second compensation transistor, the types of the first compensation transistor and the second compensation transistor are different, the first compensation transistor is a metal oxide transistor, the second compensation transistor is a polysilicon transistor, or the first compensation transistor is a polysilicon transistor, the second compensation transistor is a metal oxide transistor, the metal oxide transistor can reduce leakage current of the pixel driving circuit, the potential of the closing voltage of the polysilicon transistor is opposite to that of the metal oxide transistor, and the potential of the opening voltage of the polysilicon transistor is opposite to that of the metal oxide transistor, so that the reverse charging voltage is reduced, and the potential of the control end of the driving module is beneficial to maintaining. The invention solves the problems of larger leakage current of the display panel and low gate voltage of the driving transistor, achieves the effects of reducing the leakage current of the pixel driving circuit and maintaining the gate voltage of the driving transistor, and is beneficial to the display panel to display the brightness to be displayed.
Drawings
Fig. 1 is a schematic diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a structure of a pixel driving circuit according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present invention;
FIG. 5 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 7 is a cross-sectional view of a display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As mentioned in the background art, the existing display panel has the problems that the leakage current of the transistor of the display panel is large, the gate voltage of the driving transistor cannot be maintained, and the brightness to be displayed cannot be well displayed, and the applicant has found through careful study that the reason for generating the technical problem is that: the transistors in the pixel driving circuit of the existing display panel all adopt low-temperature polysilicon transistors, and the leakage current of the low-temperature polysilicon transistors is larger, so that the grid voltage of the driving transistor cannot be maintained, and the brightness to be displayed cannot be well displayed.
Aiming at the technical problems, the invention provides the following solutions:
fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, referring to fig. 1 and 2, the pixel driving circuit includes: a driving module 101 for generating a driving current according to the data voltage; a light emitting module 102 for responding to the driving current to display the brightness to be displayed; the data writing module 103, a first end of the data writing module 103 is connected with a data voltage, a second end of the data writing module 103 is electrically connected with a first end of the driving module 101, and the data writing module 103 is used for writing the data voltage into the first end of the driving module 101; the threshold compensation module 104 is configured to capture a threshold voltage of the driving module 101 to a control end of the driving module 101; the first storage module 105, a first end of the first storage module 105 is connected with a first power signal, and a second end of the first storage module 105 is electrically connected with a control end of the driving module 101; the first end of the second storage module 106 is electrically connected with the control end of the data writing module 103, and the second end of the second storage module 106 is electrically connected with the control end of the driving module 101; the threshold compensation module 104 includes a first compensation transistor T1 and a second compensation transistor T2 connected in series between the second terminal of the driving module 101 and the control terminal of the driving module 101, where the transistor types of the first compensation transistor T1 and the second compensation transistor T2 are different.
Specifically, the Light Emitting module 102 may be, for example, an OLED (Organic Light-Emitting Diode), which is a current-type device, and the OLED can emit Light only under the action of a driving current, and the driving module 101 may generate a corresponding driving current according to the data written by the analog data writing module 103, and the Light Emitting module 102 emits Light according to the driving current, so as to display the brightness to be displayed. The first storage module 105 may maintain the voltage of the control end of the driving module 101, and the first end of the second storage module 106 is electrically connected to the control end of the data writing module 103, and the second end of the second storage module 106 is electrically connected to the control end of the driving module 101, so that when the threshold compensation module 104 is turned off, the second storage module 106 may further maintain the voltage of the control end of the driving module 101, which is favorable for maintaining the voltage of the control end of the driving module 101 for a long time, is favorable for displaying the brightness to be displayed during low frequency driving, and avoids the voltage of the control end of the driving module 101 from being pulled down due to the opening or closing of the threshold compensation module 104. Also, the voltage of the control terminal of the driving module 101 is pulled up, so that the voltage of the first terminal of the driving module 101 is reduced, thereby reducing the voltage of the second terminal of the driving module 101, so that the power consumption of the light emitting module 102 is reduced.
Moreover, the first compensation transistor T1 and the second compensation transistor T2 are different in type, for example, the first compensation transistor T1 is a metal oxide transistor, the conduction loss of the metal oxide transistor is small, and the leakage current is small, so that the leakage current of the pixel driving circuit can be reduced, and the second compensation transistor T2 is a polysilicon transistor, so that the first compensation transistor T1 and the second compensation transistor T2 have opposite potentials of the on voltage and opposite potentials of the off voltage of the first compensation transistor T1 and the second compensation transistor T2, thereby achieving the effect of reducing the counter charge voltage. For example, the first compensation transistor T1 may be a polysilicon transistor, the second compensation transistor T2 may be a metal oxide transistor, and the types of the first compensation transistor T1 and the second compensation transistor T2 may be determined according to practical situations, which is not limited in this embodiment. The first compensation transistor T1 and the second compensation transistor T2 are different in type, so that the problem that when transistors in the pixel driving circuit, which control the control terminal of the driving module 101, are all metal oxide transistors, the voltage at the control terminal of the driving module 101 is easily pulled down when the pixel driving circuit is turned on or turned off is avoided.
The driving module 101 includes, for example, a driving transistor, and a gate of the driving transistor is a control terminal of the driving module 101.
The first power signal is, for example, a positive voltage signal VDD.
According to the technical scheme, the pixel driving circuit comprises a driving module, a light emitting module, a data writing module, a threshold compensation module, a first storage module and a second storage module, wherein the first storage module can maintain the voltage of the control end of the driving module, the first end of the second storage module is electrically connected with the control end of the data writing module, the second end of the second storage module is electrically connected with the control end of the driving module, and therefore when the threshold compensation module is closed, the second storage module can further maintain the voltage of the control end of the driving module, and the situation that the voltage of the control end of the driving module is pulled down due to the fact that the threshold compensation module is opened or closed is avoided. Moreover, the voltage of the control end of the driving module is pulled up, so that the voltage of the first end of the driving module is reduced, the voltage of the second end of the driving module is reduced, and the power consumption of the light emitting module is reduced. The threshold compensation module comprises a first compensation transistor and a second compensation transistor, the types of the first compensation transistor and the second compensation transistor are different, the first compensation transistor is a metal oxide transistor, the second compensation transistor is a polysilicon transistor, or the first compensation transistor is a polysilicon transistor, the second compensation transistor is a metal oxide transistor, the metal oxide transistor can reduce leakage current of the pixel driving circuit, the potential of the closing voltage of the polysilicon transistor is opposite to that of the metal oxide transistor, and the potential of the opening voltage of the polysilicon transistor is opposite to that of the metal oxide transistor, so that the reverse charging voltage is reduced, and the potential of the control end of the driving module is beneficial to maintaining. The technical scheme of the embodiment solves the problems that the leakage current of the display panel is large and the gate voltage of the driving transistor is pulled down, achieves the effects of reducing the leakage current of the pixel driving circuit and maintaining the gate voltage of the driving transistor, and is beneficial to the display panel to display the brightness to be displayed.
On the basis of the above technical solution, optionally, referring to fig. 2, the pixel driving circuit further includes a first initialization module 107 and a second initialization module 108; the first initializing module 107 is configured to initialize the driving module 101; the second initialization module 108 is used for initializing the light emitting module 102.
Specifically, the first initialization module 107 may write an initialization signal to the control terminal of the driving module 101 to initialize the driving module 101, and the second initialization module 108 may write an initialization signal to the first terminal of the light emitting module 102 to initialize the light emitting module 102.
Fig. 3 is a schematic diagram of a structure of a pixel driving circuit according to an embodiment of the present invention, optionally, referring to fig. 3, a control terminal of a first compensation transistor T1 is connected to a first Scan signal Scan1, a first terminal of the first compensation transistor T1 is electrically connected to a first terminal of a second compensation transistor T2, a second terminal of the first compensation transistor T1 is electrically connected to a second terminal of the driving module 101, a control terminal of the second compensation transistor T2 is connected to a second Scan signal Scan2, and a second terminal of the second compensation transistor T2 is electrically connected to a control terminal of the driving module 101; the first compensation transistor T1 is a metal oxide transistor, and the second compensation transistor T2 is a polysilicon transistor; the control terminal of the first initialization module 107 is connected to the fourth Scan signal Scan4, the first terminal of the first initialization module 107 is connected to the reference signal Vref, and the second terminal of the first initialization module 107 is electrically connected to the first terminal of the second compensation transistor T2.
Specifically, the first compensation transistor T1 is a metal oxide transistor, so that a leakage current from the second end of the driving module 101 to the first end of the second compensation module T2 in the pixel driving circuit can be reduced, that is, a part of a leakage current from the second end of the driving module 101 to the control end can be reduced, and the second compensation transistor T2 is a polysilicon transistor, so that the voltages of the on voltages of the first compensation transistor T1 and the second compensation transistor T2 are opposite, and the voltages of the off voltages of the first compensation transistor T1 and the second compensation transistor T2 are opposite, so that a back charging voltage can be reduced, and the voltage of the control end of the driving module 101 can also be maintained.
Optionally, with continued reference to fig. 2, the control terminal of the first compensation transistor T1 is connected to the first Scan signal Scan1, the first terminal of the first compensation transistor T1 is electrically connected to the control terminal of the driving module 101, the second terminal of the first compensation transistor T1 is electrically connected to the second terminal of the second compensation transistor T2, the control terminal of the second compensation transistor T2 is connected to the third Scan signal Scan3, and the first terminal of the second compensation transistor T2 is electrically connected to the second terminal of the driving module 101; the first compensation transistor T1 is a metal oxide transistor, and the second compensation transistor T2 is a polysilicon transistor; the control terminal of the first initialization module 107 is connected to the fourth Scan signal Scan4, the first terminal of the first initialization module 107 is connected to the reference signal Vref, and the second terminal of the first initialization module 107 is electrically connected to the first terminal of the second compensation transistor T2.
Specifically, the first compensation transistor T1 is a metal oxide transistor, the leakage current is smaller, so that the leakage current between the first initialization module 107 and the control terminal of the driving module 101 can be reduced, the leakage current between the second terminal and the control terminal of the driving module 101 can be reduced, so that the leakage current of the pixel driving circuit can be reduced to a greater extent, the second compensation transistor T2 is, for example, a polysilicon transistor, so that the voltages of the on voltages of the first compensation transistor T1 and the second compensation transistor T2 are opposite, and the voltages of the off voltages of the first compensation transistor T1 and the second compensation transistor T2 are opposite, so that the reverse charging voltage can be reduced, and the voltage of the control terminal of the driving module 101 can be maintained. And, the first end of the first compensation transistor T1 is electrically connected to the control end of the driving module 101, the second end of the first compensation transistor T1 is electrically connected to the second end of the second compensation transistor T2, and when the first end of the second compensation transistor T2 is electrically connected to the second end of the driving module 101, the second compensation transistor T2 and the data writing module 103 are commonly connected to the third Scan signal Scan3, so that the number of Scan lines can be reduced, and the effect of simplifying the layout design can be achieved.
Optionally, the first initialization module 107 and/or the second initialization module 108 are metal oxide transistors.
Specifically, the first initialization module 107 is a metal oxide transistor, or the second initialization module 108 is a metal oxide transistor, so that the leakage current of the pixel driving circuit in the initialization stage can be reduced. The first initialization module 107 and the second initialization module 108 may be metal oxide transistors, so that leakage current of the pixel driving circuit in the initialization stage can be reduced to a greater extent.
Optionally, with continued reference to fig. 2, the pixel driving circuit further includes a first light emission control module 109 and a second light emission control module 110; the control end of the data writing module 103 is connected with a third scanning signal Scan3; the control end of the second initialization module 108 is connected to the fourth Scan signal Scan4, the first end of the second initialization module 108 is connected to the reference signal Vref, and the second end of the second initialization module 108 is electrically connected to the first end of the light emitting module 102; the control end of the first light emitting control module 109 is connected with an enable signal EM, the first end of the first light emitting control module 109 is connected with a first power signal, and the second end of the first light emitting control module 109 is electrically connected with the first end of the driving module 101; the control end of the second light emitting control module 110 is connected to the enable signal EM, the first end of the second light emitting control module 110 is electrically connected to the second end of the driving module 101, the second end of the second light emitting control module 110 is electrically connected to the first end of the light emitting module 102, and the second end of the light emitting module 102 is connected to the second power signal.
Specifically, the second power supply signal is a negative voltage signal VSS. In the initialization stage, the first initialization module 107 and the second initialization module 108 are turned on, the first initialization module 107 initializes the driving module 101 through the threshold compensation module 104, and the second initialization module 108 initializes the light emitting module 102. In the Data writing stage, the Data writing module 103 is turned on, and the Data writing module 103 writes the Data voltage Data into the first terminal of the driving module 101. In the light emitting stage, the first light emitting control module 109 and the second light emitting control module 110 are turned on, the driving module 101 generates a driving current according to the data voltage, and the light emitting module 102 emits light according to the driving current to realize the brightness to be displayed.
Fig. 4 is a schematic structural diagram of still another pixel driving circuit according to an embodiment of the present invention, optionally, referring to fig. 4, the driving module 101 includes a third transistor T3, a control terminal of the third transistor T3 is a control terminal of the driving module 101, a first terminal of the third transistor T3 is a first terminal of the driving module 101, and a second terminal of the third transistor T3 is a second terminal of the driving module 101; the first initialization module 107 includes a fourth transistor T4, a control terminal of the fourth transistor T4 is a control terminal of the first initialization module 107, a first terminal of the fourth transistor T4 is a first terminal of the first initialization module 107, and a second terminal of the fourth transistor T4 is a second terminal of the first initialization module 107; the second initialization module 108 includes a fifth transistor T5, a control terminal of the fifth transistor T5 is a control terminal of the second initialization module 108, a first terminal of the fifth transistor T5 is a first terminal of the second initialization module 108, and a second terminal of the fifth transistor T5 is a second terminal of the second initialization module 108; the data writing module 103 includes a sixth transistor T6, a control terminal of the sixth transistor T6 is a control terminal of the data writing module 103, a first terminal of the sixth transistor T6 is a first terminal of the data writing module 103, and a second terminal of the sixth transistor T6 is a second terminal of the data writing module 103; the first light emitting control module 109 includes a seventh transistor T7, a control terminal of the seventh transistor T7 is a control terminal of the first light emitting control module 109, a first terminal of the seventh transistor T7 is a first terminal of the first light emitting control module 109, and a second terminal of the seventh transistor T7 is a second terminal of the first light emitting control module 109; the second light-emitting control module 110 includes an eighth transistor T8, a control end of the eighth transistor T8 is a control end of the second light-emitting control module 110, a first end of the eighth transistor T8 is a first end of the second light-emitting control module 110, and a second end of the eighth transistor T8 is a second end of the second light-emitting control module 110; the first memory module 105 includes a first capacitor C1, a first end of the first capacitor C1 is a first end of the first memory module 105, and a second end of the first capacitor C1 is a second end of the first memory module 105; the second storage module 106 includes a second capacitor C2, a first end of the second capacitor C2 is a first end of the second storage module 106, and a second end of the second capacitor C2 is a second end of the second storage module 106; the light emitting module 102 includes an organic light emitting diode D1, a first end of the organic light emitting diode D1 is a first end of the light emitting module 102, and a second end of the organic light emitting diode D1 is a second end of the light emitting module 102.
The first end of the organic light emitting diode D1 is, for example, an anode, and the second end of the organic light emitting diode D1 is, for example, a cathode.
Specifically, the first compensation transistor T1 is, for example, a metal oxide transistor, and the leakage current is small, so that the leakage current of the control terminal of the driving module 101 can be reduced, that is, the leakage current of the main circuit of the pixel driving circuit can be reduced, and the second compensation transistor T2 is, for example, a polysilicon transistor, so that the voltages of the on voltages of the first compensation transistor T1 and the second compensation transistor T2 are opposite, and the voltages of the off voltages of the first compensation transistor T1 and the second compensation transistor T2 are opposite, so that the reverse charging voltage can be reduced, and the voltage of the control terminal of the driving module 101 can be maintained. The fourth transistor T4 and the fifth transistor T5 are, for example, metal oxide transistors, so that the leakage current of the pixel driving circuit can be further reduced. The first capacitor C1 can maintain the potential of the control terminal of the third transistor T3, and the second capacitor C2 can further maintain the potential of the control terminal of the third transistor T3, so that during low-frequency driving, the potential of the control terminal of the third transistor T3 can be maintained for a long time, thereby better displaying the brightness to be displayed.
Note that fig. 4 only shows the case where the first initialization module 107 and the second initialization module 108 are both metal oxide transistors; and only the case where the first terminal of the first compensation transistor T1 is electrically connected to the first terminal of the second compensation transistor T2, the second terminal of the first compensation transistor T1 is electrically connected to the control terminal of the driving module 101, and the second terminal of the second compensation transistor T2 is electrically connected to the second terminal of the driving module 101 is shown, but not limited thereto.
Fig. 5 is a timing chart of a pixel driving circuit according to an embodiment of the present invention, and it should be noted that the timing chart of fig. 5 is applicable to the pixel driving circuits of fig. 2 and 4. Alternatively, referring to fig. 4 and 5, in the stage T1, the fourth Scan signal Scan4 and the first Scan signal Scan1 are at a high level, the first initialization module 107, the second initialization module 108 and the first compensation transistor T1 are turned on, the first initialization module 107 initializes the control terminal of the driving module 101 through the first compensation transistor T1, the reference signal Vref is written into the control terminal of the driving module 101, and the second initialization module 108 initializes the light emitting module 102; in the stage T2, the first Scan signal Scan1 is at a high level, the third Scan signal Scan3 is at a low level, the Data writing module 103, the first compensation transistor T1 and the second compensation transistor T2 are turned on, the Data writing module 103 writes the Data voltage Data into the first end of the driving module 101, the voltage between the control end of the driving module 101 and the first end of the driving module 101 is greater than the threshold voltage of the driving module 101, the driving module 101 is turned on, the second end of the driving module 101 charges the second storage module 106 through the first compensation transistor T1 and the second compensation transistor T2, and when the second end voltage of the second storage module 106 is Vdata-vth|, the driving module is turned off, and charging is stopped, wherein Vdata is the Data voltage, and Vth is the threshold voltage of the driving module; in the period t3, the enable signal EM is low, the first light emitting control module 109 and the second light emitting control module 110 are turned on, and the driving current i=k [ (VDD- (Vdata-vth|)) to vth|vth|generated by the driving module 101] 2 ＝K(VDD-Vdata) 2 The driving current is not related to the threshold voltage of the driving module 101, so that the threshold compensation effect is achieved, the light emitting module 102 obtains the driving current, and the light emitting module 102 emits light according to the driving current, wherein K is a constant related to the driving module.
Fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention, referring to fig. 6, the display panel includes a plurality of pixel driving circuits PX according to any of the above embodiments, the display panel may include a plurality of crisscrossed scanning lines (S1 to Sk), data lines (DL 1 to DLj) and enable signal lines (EL 1 to ELm), the data lines are sent by a data driver, the scanning lines are sent by a scan driver, the enable signal lines are sent by a light emitting driver, a timing controller controls the data driver, the scan driver and the light emitting driver, the pixel driving circuits are located in an area defined by the scanning lines and the data lines, and the scanning lines may include, for example, a first scanning line, a second scanning line and a third scanning line, and provide scanning signals to the pixel driving circuits PX. The pixel driving circuit provided by any embodiment of the present invention has the same advantages, and is not described herein.
Fig. 7 is a cross-sectional view of a display panel according to an embodiment of the present invention, optionally, referring to fig. 7, the display panel includes a substrate, an active layer, a gate metal layer, a source drain metal layer, and a power metal layer; the first electrode plate 1051 of the first memory module 105 is located on the source-drain metal layer, the first electrode plate 1051 of the first memory module 105 is used as the second end of the first memory module 105, the second electrode plate 1052 of the first memory module 105 is located on the power metal layer, and the second electrode plate 1052 of the first memory module 105 is used as the first end of the first memory module 105; the first plate 1051 of the first memory module 105 is multiplexed into the first plate 1061 of the second memory module 106, and the second plate 1062 of the second memory module 106 is located on the gate metal layer, and the second plate 1062 of the second memory module 106 is used as the second end of the second memory module.
Specifically, the display panel includes a substrate, an active layer, a gate metal layer, a source-drain metal layer, and a power metal layer sequentially stacked, and an eighth transistor T8 formed in the film layer is electrically connected to an anode 1021 of the light emitting module 102 to supply a driving current, the eighth transistor T8 including an active layer 201, a gate 202, a first electrode 203, and a second electrode 204; the seventh transistor T7 includes an active layer 301, a gate electrode 302, a first electrode 303, and a second electrode 304, the first electrode 303 being connected to a power metal electrode 305 located in the power metal layer through a via. The first memory module 105 is, for example, a first capacitor C1, the second memory module 106 is, for example, a second capacitor C2, the first plate 1051 of the first capacitor C1 is located on the source-drain metal layer, and the second plate 1052 of the first capacitor C1 is located on the power metal layer; the first polar plate 1051 of the first capacitor C1 is multiplexed into the first polar plate 1061 of the second capacitor C2, the second polar plate 1062 of the second capacitor C2 is located on the gate metal layer, and the layout space occupied by the whole of the first storage module 105 and the second storage module 106 is smaller, which is favorable for reducing the space occupied by the whole pixel driving circuit, and further improves the aperture ratio of the display panel.
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 8, 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, etc., and therefore, the display device includes the display panel according to any embodiment of the present invention, and therefore, the display device has the same advantages and is not described herein again.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A pixel driving circuit, comprising:
the driving module is used for generating driving current according to the data voltage;
the light-emitting module is used for responding to the driving current to display the brightness to be displayed;
the first end of the data writing module is connected with the data voltage, the second end of the data writing module is electrically connected with the first end of the driving module, and the data writing module is used for writing the data voltage into the first end of the driving module;
the threshold compensation module is used for grabbing the threshold voltage of the driving module to the control end of the driving module;
the first end of the first storage module is connected with a first power supply signal, and the second end of the first storage module is electrically connected with the control end of the driving module;
the first end of the second storage module is electrically connected with the control end of the data writing module, and the second end of the second storage module is electrically connected with the control end of the driving module;
the threshold compensation module comprises a first compensation transistor and a second compensation transistor which are connected in series between the second end of the driving module and the control end of the driving module, and the transistor types of the first compensation transistor and the second compensation transistor are different.
2. The pixel driving circuit according to claim 1, further comprising a first initialization module and a second initialization module;
the first initialization module is used for initializing the driving module;
the second initialization module is used for initializing the light emitting module.
3. The pixel driving circuit according to claim 2, wherein a control terminal of the first compensation transistor is connected to a first scan signal, a first terminal of the first compensation transistor is electrically connected to a first terminal of the second compensation transistor, a second terminal of the first compensation transistor is electrically connected to a second terminal of the driving module, a control terminal of the second compensation transistor is connected to a second scan signal, and a second terminal of the second compensation transistor is electrically connected to a control terminal of the driving module; the first compensation transistor is a metal oxide transistor, and the second compensation transistor is a polysilicon transistor;
the control end of the first initialization module is connected with a fourth scanning signal, the first end of the first initialization module is connected with a reference signal, and the second end of the first initialization module is electrically connected with the first end of the second compensation transistor.
4. The pixel driving circuit according to claim 2, wherein a control terminal of the first compensation transistor is connected to a first scan signal, a first terminal of the first compensation transistor is electrically connected to a control terminal of the driving module, a second terminal of the first compensation transistor is electrically connected to a second terminal of the second compensation transistor, a control terminal of the second compensation transistor is connected to a third scan signal, and a first terminal of the second compensation transistor is electrically connected to a second terminal of the driving module; the first compensation transistor is a metal oxide transistor, and the second compensation transistor is a polysilicon transistor;
the control end of the first initialization module is connected with a fourth scanning signal, the first end of the first initialization module is connected with a reference signal, and the second end of the first initialization module is electrically connected with the second end of the second compensation transistor.
5. The pixel driving circuit according to claim 4, wherein the first initialization module and/or the second initialization module is a metal oxide transistor.
6. The pixel driving circuit according to claim 4, further comprising a first light emission control module and a second light emission control module;
the control end of the data writing module is connected with a third scanning signal;
the control end of the second initialization module is connected with the fourth scanning signal, the first end of the second initialization module is connected with the reference signal, and the second end of the second initialization module is electrically connected with the first end of the light-emitting module;
the control end of the first light-emitting control module is connected with an enabling signal, the first end of the first light-emitting control module is connected with a first power signal, and the second end of the first light-emitting control module is electrically connected with the first end of the driving module; the control end of the second light-emitting control module is connected with the enabling signal, the first end of the second light-emitting control module is electrically connected with the second end of the driving module, the second end of the second light-emitting control module is electrically connected with the first end of the light-emitting module, and the second end of the light-emitting module is connected with a second power supply signal.
7. The pixel driving circuit according to claim 6, wherein,
the driving module comprises a third transistor, the control end of the third transistor is the control end of the driving module, the first end of the third transistor is the first end of the driving module, and the second end of the third transistor is the second end of the driving module;
the first initialization module comprises a fourth transistor, the control end of the fourth transistor is the control end of the first initialization module, the first end of the fourth transistor is the first end of the first initialization module, and the second end of the fourth transistor is the second end of the first initialization module;
the second initialization module comprises a fifth transistor, the control end of the fifth transistor is the control end of the second initialization module, the first end of the fifth transistor is the first end of the second initialization module, and the second end of the fifth transistor is the second end of the second initialization module;
the data writing module comprises a sixth transistor, wherein the control end of the sixth transistor is the control end of the data writing module, the first end of the sixth transistor is the first end of the data writing module, and the second end of the sixth transistor is the second end of the data writing module;
the first light emitting control module comprises a seventh transistor, the control end of the seventh transistor is the control end of the first light emitting control module, the first end of the seventh transistor is the first end of the first light emitting control module, and the second end of the seventh transistor is the second end of the first light emitting control module;
the second light-emitting control module comprises an eighth transistor, the control end of the eighth transistor is the control end of the second light-emitting control module, the first end of the eighth transistor is the first end of the second light-emitting control module, and the second end of the eighth transistor is the second end of the second light-emitting control module;
the first storage module comprises a first capacitor, a first end of the first capacitor is a first end of the first storage module, and a second end of the first capacitor is a second end of the first storage module;
the second storage module comprises a second capacitor, a first end of the second capacitor is a first end of the second storage module, and a second end of the second capacitor is a second end of the second storage module;
the light emitting module comprises an organic light emitting diode, wherein a first end of the organic light emitting diode is a first end of the light emitting module, and a second end of the organic light emitting diode is a second end of the light emitting module.
8. A display panel comprising the pixel driving circuit according to any one of claims 1-7.
9. The display panel of claim 8, wherein the display panel comprises a substrate, an active layer, a gate metal layer, a source drain metal layer, and a power supply metal layer;
the first polar plate of the first storage module is positioned on the source-drain metal layer, the first polar plate of the first storage module is used as the second end of the first storage module, the second polar plate of the first storage module is positioned on the power supply metal layer, and the second polar plate of the first storage module is used as the first end of the first storage module;
the first polar plate of the first storage module is multiplexed to the first polar plate of the second storage module, the second polar plate of the second storage module is located in the gate metal layer, and the second polar plate of the second storage module serves as the second end of the second storage module.
10. A display device comprising the display panel of claim 8 or 9.
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| CN114241977B (en) * | 2021-12-17 | 2024-07-19 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
| CN114446241B (en) * | 2022-02-28 | 2023-07-21 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display substrate |
| CN114898703A (en) * | 2022-05-27 | 2022-08-12 | 云谷（固安）科技有限公司 | Pixel circuit, driving method thereof and display panel |
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| CN108630141B (en) * | 2017-03-17 | 2019-11-22 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and its driving method |
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