CN115101016A - Threshold adjusting circuit and method, pixel driving circuit and driving method thereof, and display panel - Google Patents

Threshold adjusting circuit and method, pixel driving circuit and driving method thereof, and display panel Download PDF

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Publication number
CN115101016A
CN115101016A CN202210713587.5A CN202210713587A CN115101016A CN 115101016 A CN115101016 A CN 115101016A CN 202210713587 A CN202210713587 A CN 202210713587A CN 115101016 A CN115101016 A CN 115101016A
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module
double
gate
transistor
gate transistor
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CN202210713587.5A
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Chinese (zh)
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周吉
孙渺
姚远
肖一鸣
朱修剑
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Kunshan Govisionox Optoelectronics Co Ltd
Hefei Visionox Technology Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
Hefei Visionox Technology Co Ltd
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Priority to CN202210713587.5A priority Critical patent/CN115101016A/en
Publication of CN115101016A publication Critical patent/CN115101016A/en
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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
    • G09G3/3258—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 voltage across the light-emitting element
    • 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 threshold adjusting circuit and method, a pixel driving circuit and driving method thereof and a display panel. The threshold adjusting circuit comprises a first initialization module, a first double-gate transistor, a first storage module and a threshold adjusting module; the first initialization module is electrically connected with the top gate of the first double-gate transistor and is used for initializing the top gate of the first double-gate transistor; the first end of the first storage module is electrically connected with the bottom gate of the first double-gate transistor, and the first storage module is used for maintaining the potential of the bottom gate of the first double-gate transistor; a first end of the first double-gate transistor is connected to a first power supply signal; the first end of the threshold adjusting module is connected with the second end of the first double-gate transistor, the second end of the threshold adjusting module is electrically connected with the bottom gate of the first double-gate transistor, and the threshold adjusting module is used for controlling the potential of the bottom gate of the first double-gate transistor so as to control the threshold voltage of the first double-gate transistor. The technical scheme of the invention improves the display uniformity of the display panel.

Description

Threshold adjusting circuit and method, pixel driving circuit and driving method thereof, and display panel
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a threshold adjusting circuit and method, a pixel driving circuit and 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.
In a conventional display panel, the threshold voltage of a driving transistor is not uniform, so that the driving current is not uniform, and the display uniformity of the display panel is influenced.
Disclosure of Invention
The invention provides a threshold adjusting circuit and method, a pixel driving circuit and driving method thereof and a display panel, and aims to improve the display uniformity of the display panel.
In a first aspect, an embodiment of the present invention provides a threshold adjustment circuit, where the threshold adjustment circuit includes: the device comprises a first initialization module, a first double-gate transistor, a first storage module and a threshold adjusting module;
the first initialization module is electrically connected with the top gate of the first double-gate transistor and is used for initializing the top gate of the first double-gate transistor;
the first end of the first storage module is electrically connected with the bottom gate of the first double-gate transistor, and the first storage module is used for maintaining the potential of the bottom gate of the first double-gate transistor;
a first end of the first double-gate transistor is connected to a first power supply signal;
the first end of the threshold adjusting module is connected with the second end of the first double-gate transistor, the second end of the threshold adjusting module is electrically connected with the bottom gate of the first double-gate transistor, and the threshold adjusting module is used for controlling the potential of the bottom gate of the first double-gate transistor so as to adjust the threshold voltage of the first double-gate transistor.
In a second aspect, an embodiment of the present invention provides a threshold adjusting method, where the threshold adjusting method is used to implement the threshold adjusting circuit in the first aspect, and the threshold adjusting method includes:
in an initialization stage, a first initialization module is conducted, and the first initialization module initializes the top gate of a first double-gate transistor;
in a threshold adjustment stage, the threshold adjustment module and the first double-gate transistor are turned on, and a first power supply signal charges the first storage module through the first double-gate transistor and the threshold adjustment module to control the potential of the bottom gate of the first double-gate transistor, so as to adjust the threshold voltage of the first double-gate transistor.
In a third 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 module, a second storage module, a first initialization module and a threshold adjusting module, wherein the driving module comprises a first double-gate transistor;
the data writing module is connected with the top gate of the first double-gate transistor and is used for writing a data voltage signal into the driving module;
a first end of the first double-gate transistor is connected to a first power supply signal, a second end of the first double-gate transistor is connected with a first end of the light emitting module, the driving module is used for generating driving current, and the light emitting module is used for responding to the driving current to emit light;
the top gate of the first double-gate transistor is connected with the second storage module, and the bottom gate of the first double-gate transistor is connected with the first storage module; the second storage module is used for maintaining the potential of the top gate of the first double-gate transistor, and the first storage module is used for maintaining the potential of the bottom gate of the first double-gate transistor;
the first initialization module is electrically connected with the top gate of the first double-gate transistor and is used for initializing the top gate of the first double-gate transistor;
the first end of the threshold adjusting module is connected with the second end of the first double-gate transistor, the second end of the threshold adjusting module is electrically connected with the bottom gate of the first double-gate transistor, and the threshold adjusting module is used for controlling the potential of the bottom gate of the first double-gate transistor so as to adjust the threshold voltage of the first double-gate transistor.
Optionally, the pixel driving circuit further comprises: a second initialization module;
the second initialization module is used for initializing the light emitting module, and/or the second initialization module is used for initializing the bottom gate of the first double-gate transistor through the threshold adjusting module;
preferably, a control end of the second initialization module is connected to a first scanning signal, a first end of the second initialization module is connected to the first initialization signal, a second end of the second initialization module is electrically connected to the first end of the light emitting module, and a second end of the light emitting module is connected to a second power signal;
the second end of the second initialization module is also electrically connected with the first end of the threshold adjusting module;
preferably, the second initialization module includes a fifth transistor, a first end of the fifth transistor is a first end of the second initialization module, a second end of the fifth transistor is a second end of the second initialization module, and a control end of the fifth transistor is a control end of the second initialization module.
Optionally, the control end of the first initialization module is connected to the second scan signal, the first end of the first initialization module is connected to the second initialization signal, and the second end of the first initialization module is electrically connected to the top gate of the first double-gate transistor;
preferably, the first initialization module includes a fourth transistor, a first end of the fourth transistor is a first end of the first initialization module, a second end of the fourth transistor is a second end of the first initialization module, and a control end of the fourth transistor is a control end of the first initialization module.
Optionally, the pixel driving circuit further comprises: the light-emitting control module is arranged between the driving module and the light-emitting module and is used for controlling the light-emitting module in a light-emitting stage;
preferably, the second end of the first double-gate transistor is electrically connected with the first end of the light emitting control module, the second end of the light emitting control module is electrically connected with the first end of the light emitting module, and the control end of the light emitting control module is connected to an enable signal.
Optionally, the top gate of the first double-gate transistor is electrically connected to the first end of the second memory module, and the second end of the second memory module is electrically connected to the first end of the first double-gate transistor;
and/or the bottom gate of the first double-gate transistor is electrically connected with the first end of the first memory module, and the second end of the second memory module is electrically connected with the first end of the first double-gate transistor;
preferably, the second storage module includes 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;
preferably, the first storage module includes 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.
Optionally, a control end of the threshold adjusting module is connected to a second scanning signal, and the threshold adjusting module includes a second transistor;
the first end of the second transistor is the first end of the threshold adjusting module, the control end of the second transistor is the control end of the threshold adjusting module, and the second end of the second transistor is the second end of the threshold adjusting module;
and/or a control end of the data writing module is connected with a third scanning signal, a first end of the data writing module is connected with a data voltage signal, and a second end of the data writing module is electrically connected with a top gate of the first double-gate transistor;
preferably, the data writing module includes a third transistor, a first end of the third transistor is a first end of the data writing module, a second end of the third transistor is a second end of the data writing module, and a control end of the third transistor is a control end of the data writing module.
Optionally, a voltage value corresponding to the second initialization signal is smaller than a voltage value corresponding to the first power signal.
In a fourth aspect, an embodiment of the present invention further provides a driving method for a pixel driving circuit, where the driving method is used to drive the pixel driving circuit described in any of the third aspects, and the driving method includes:
in an initialization stage, a first initialization module is conducted, and the first initialization module initializes a top gate of a driving module;
in a threshold adjusting stage, a threshold adjusting module is conducted with the driving module, and a first power supply signal charges the first storage module through the driving module and the threshold adjusting module to control the potential of a bottom gate of the driving module so as to adjust the threshold voltage of the driving module;
in a data writing stage, a data writing module is conducted, and the data writing module writes a data voltage signal into the driving module;
and in the light-emitting stage, the driving module is switched on, the driving module generates driving current according to the data voltage signal, and the light-emitting module responds to the driving current to emit light.
In a fifth 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 third aspects.
In the present invention, a threshold adjustment circuit includes: the device comprises a first initialization module, a first double-gate transistor, a first storage module and a threshold adjusting module; the threshold adjusting module can control the threshold voltage of the first double-gate transistor by controlling the potential of the bottom gate of the first double-gate transistor, and adjusts the threshold voltage of the first double-gate transistor, so that the driving current generated by the first double-gate transistor cannot be non-uniform due to uneven threshold voltage; the threshold voltage regulating circuit is applied to the pixel driving circuit of the display panel, so that the display uniformity of the display panel can be improved. The technical scheme of the embodiment solves the problem that the driving current is not uniform due to non-uniform intrinsic threshold voltage caused by the process problem of the low-temperature polysilicon transistor, and improves the display uniformity of the display panel.
Drawings
Fig. 1 is a schematic circuit diagram of a threshold adjustment circuit according to an embodiment of the present invention;
FIG. 2 is a method for adjusting a threshold according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 7 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the invention;
FIG. 8 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention;
FIG. 9 is a timing diagram of a pixel driving circuit according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 11 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.
As mentioned in the background art, the display panel in the prior art has the problem of display non-uniformity, and the applicant has found through careful study that the reason for this technical problem is: the driving transistors in the pixel driving circuit of the display panel mostly adopt low-temperature polysilicon transistors, and due to the process reason of the low-temperature polysilicon transistors, different driving transistors have differences, so that the intrinsic threshold voltage Vth0 of the driving transistors are inconsistent, the driving current generated by the driving transistors is not uniform, and the display of the display panel is not uniform.
In view of the above problem, an embodiment of the present invention provides a threshold adjustment circuit, and fig. 1 is a schematic circuit structure diagram of the threshold adjustment circuit provided in the embodiment of the present invention, and referring to fig. 1, the threshold adjustment circuit includes: a first initialization module 106, a first double-gate transistor T1, a first memory module 105, and a threshold adjustment module 107; the first initialization module 106 is electrically connected to the top gate of the first double-gate transistor T1, the first initialization module 106 is configured to initialize the top gate of the first double-gate transistor T1; the first terminal of the first memory module 105 is electrically connected to the bottom gate of the first double-gate transistor T1, and the first memory module 105 is configured to maintain the potential of the bottom gate of the first double-gate transistor T1; a first end of the first double-gate transistor T1 is connected to a first power signal VDD; the first terminal of the threshold adjusting module 107 is connected to the second terminal of the first double-gate transistor T1, the second terminal of the threshold adjusting module 107 is electrically connected to the bottom gate of the first double-gate transistor T1, and the threshold adjusting module 107 is configured to control a potential of the bottom gate of the first double-gate transistor T1 to adjust a threshold voltage of the first double-gate transistor T1.
The first double-gate transistor T1 includes a top gate and a bottom gate, and the threshold voltage of the first double-gate transistor T1 has a negative correlation with the bottom gate voltage, that is, as the bottom gate voltage of the first double-gate transistor T1 increases, the threshold voltage of the first double-gate transistor T1 decreases; when the bottom gate voltage of the first double-gate transistor T1 decreases, the threshold voltage of the first double-gate transistor T1 increases, and therefore, the threshold adjusting module 107 controls the potential of the bottom gate of the first double-gate transistor T1 to further adjust the threshold voltage of the first double-gate transistor T1, so that the threshold voltage of the first double-gate transistor T1 is not affected by the intrinsic threshold voltage Vth0, and thus the driving currents generated by the first double-gate transistor T1 under the same gate voltage are not non-uniform due to the individual difference among the first double-gate transistors T1, thereby improving the display uniformity of the display panel.
Specifically, the first initialization module 106 may initialize the top gate of the first double-gate transistor T1 such that the top gate voltage of the first double-gate transistor T1 is the initialization signal Vref, the first terminal of the first double-gate transistor T1 is connected to the first power signal VDD, for example, a positive voltage signal, and the first power signal VDD may charge the first memory module 105 through the first double-gate transistor T1 and the threshold adjustment module 107, such that the bottom gate potential of the first double-gate transistor T1 is increased, such that the threshold voltage Vth of the first double-gate transistor T1 is decreased, until the threshold voltage Vth of the first double-gate transistor T1 is equal to the difference Vref-VDD between the top gate and the first terminal of the first double-gate transistor T1, and the first double-gate transistor T1 is turned off. That is, the threshold voltages Vth of the first double-gate transistors T1 after adjustment are all Vref-VDD, the threshold voltages Vth are only related to the initialization signal Vref and the first power signal VDD, and are not related to the intrinsic threshold voltage Vth0, so that the influence of differences among different driving transistors is reduced, and the threshold voltages Vth of the first double-gate transistors T1 are kept consistent. The threshold adjusting circuit is applied to a pixel driving circuit of a display panel, the first double-gate transistor T1 can be used as a driving transistor of the pixel driving circuit, the threshold of the driving transistor can be adjusted, the threshold voltage of the adjusted driving transistor is not influenced by the intrinsic threshold voltage Vth0, namely, the problem of non-uniform threshold voltage of the driving transistor does not exist, and the problem of non-uniform driving current caused by non-uniform threshold voltage does not exist. When the top gate voltage of the first double-gate transistor T1 is the data voltage signal Vdata, the top gate of the first double-gate transistor T1 and the first double-gate transistorThe potential difference Vgs at the first end of the transistor T1 is Vdata-VDD, and therefore the driving current I generated by the first double-gate transistor T1 is K (Vgs-Vth) 2 ＝K[Vdata-VDD-
(Vref-VDD)] 2 ＝K(Vdata-Vref) 2 K is a constant related to the first double-gate transistor T1, so that the driving current generated by the first double-gate transistor T1 is independent of the threshold voltage Vth of the first double-gate transistor T1, and the driving current is only related to the initialization signal Vref and the data voltage signal Vdata, thereby achieving the effect of threshold compensation and solving the problem that the driving current is not uniform due to non-uniform intrinsic threshold voltage of the low-temperature polysilicon transistor caused by process problems. And the driving current is irrelevant to the first power supply signal VDD, so the voltage drop loss of the first power supply signal VDD cannot influence the magnitude of the driving current, thereby the light emitting module in the pixel driving circuit of the display panel can better display the brightness to be displayed, the display uniformity of the display panel is improved, and the display effect of the display panel is favorably improved.
According to the technical scheme of the embodiment of the invention, the threshold value adjusting circuit comprises: the device comprises a first initialization module, a first double-gate transistor, a first storage module and a threshold adjusting module; the threshold adjusting module can control the threshold voltage of the first double-gate transistor by controlling the potential of the bottom gate of the first double-gate transistor, and adjusts the threshold voltage of the first double-gate transistor, so that the driving current generated by the first double-gate transistor cannot be non-uniform due to uneven threshold voltage; the threshold voltage regulating circuit is applied to the pixel driving circuit of the display panel, so that the display uniformity of the display panel can be improved. The technical scheme of the embodiment solves the problem that the driving current is not uniform due to non-uniform intrinsic threshold voltage caused by the process problem of the low-temperature polysilicon transistor, and improves the display uniformity of the display panel.
Fig. 2 is a threshold adjustment method provided by an embodiment of the present invention, the threshold adjustment method is used to implement the threshold adjustment circuit provided in the foregoing embodiment, and referring to fig. 2, the threshold adjustment method includes:
s100, in an initialization stage, the first initialization module is conducted, and the first initialization module initializes the top gate of the first double-gate transistor.
Specifically, referring to fig. 1, in the initialization stage, the first initialization module 106 is turned on, and the first initialization module 106 may write the initialization signal Vref into the top gate of the first double-gate transistor T1, and initialize the top gate of the first double-gate transistor T1, so that the voltage of the top gate of the first double-gate transistor T1 is the initialization signal Vref.
S200, in the threshold adjusting stage, the threshold adjusting module and the first double-gate transistor are conducted, and the first power supply signal charges the first storage module through the first double-gate transistor and the threshold adjusting module so as to control the potential of the bottom gate of the first double-gate transistor and further adjust the threshold voltage of the first double-gate transistor.
Specifically, referring to fig. 1, in the threshold adjustment phase, the threshold adjustment module 107 is turned on, and the first double-gate transistor T1 is turned on, the first power signal VDD charges the first memory module 105 through the first double-gate transistor T1 and the threshold adjustment module 107, so that the bottom gate potential of the first double-gate transistor T1 is raised, so that the threshold voltage of the first double-gate transistor T1 is lowered, until the threshold voltage Vth of the first double-gate transistor T1 is equal to the difference Vref-VDD between the voltages of the top gate and the first end of the first double-gate transistor T1, and the first double-gate transistor T1 is turned off, so the threshold voltage Vth of the first double-gate transistor T1 is equal to Vref-VDD; therefore, the threshold voltage is adjusted, and the problem that the driving current is not uniform due to non-uniform intrinsic threshold voltage caused by the process problem of the low-temperature polysilicon transistor is solved. The threshold adjusting circuit is applied to a pixel driving circuit of a display panel, the first double-gate transistor T1 can be used as a driving transistor of the pixel driving circuit, and the threshold of the driving transistor is adjustable; when the top-gate voltage of the first double-gate transistor T1 is the data voltage signal Vdata, the potential difference Vgs between the top gate of the first double-gate transistor T1 and the first end of the first double-gate transistor T1 is Vdata-VDD, and therefore the driving current I generated by the first double-gate transistor T1 is K (Vgs-Vth) 2 ＝K[Vdata-VDD-(Vref-VDD)] 2 ＝K(Vdata-Vref) 2 K is a constant related to the first double-gate transistor T1, so that the driving current generated by the first double-gate transistor T1 is unrelated to the threshold voltage Vth of the first double-gate transistor T1, so that the driving current is related to the initialization signal Vref and the data voltage signal Vdata only, and the effect of threshold compensation is achieved.
An embodiment of the present invention provides a pixel driving circuit, and fig. 3 is a schematic circuit structure diagram of the pixel driving circuit provided in the embodiment of the present invention, and referring to fig. 3, the pixel driving circuit includes: the data writing module 101, the driving module 102, the light emitting module 103, the second storage module 104, the first storage module 105, the first initialization module 106 and the threshold adjusting module 107, wherein the driving module 102 includes a first double-gate transistor T1; the data writing module 101 is connected to the top gate of the first double-gate transistor T1, and the data writing module 101 is configured to write a data voltage signal Vdata into the driving module 102; a second terminal of the first double-gate transistor T1 is connected to a first terminal of the light emitting module 103, the driving module 102 is configured to generate a driving current, and the light emitting module 103 is configured to emit light in response to the driving current; the top gate of the first double-gate transistor T1 is connected to the second memory block 104, and the bottom gate of the first double-gate transistor T1 is connected to the first memory block 105; the second storage module 104 is used for maintaining the potential of the top gate of the first double-gate transistor T1, and the first storage module 105 is used for maintaining the potential of the bottom gate of the first double-gate transistor T1; the first initialization module 106 is electrically connected to the top gate of the first double-gate transistor T1, the first initialization module 106 is configured to initialize the top gate of the first double-gate transistor T1; the threshold adjusting module 107 has a first terminal connected to the second terminal of the first double-gate transistor T1, a second terminal electrically connected to the bottom gate of the first double-gate transistor T1, and the threshold adjusting module 107 is configured to control a potential of the bottom gate of the first double-gate transistor T1 to adjust a threshold voltage of the first double-gate transistor T1.
The Light Emitting module 103 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, the driving module 102 may generate a corresponding driving current according to the data voltage signal Vdata, and the Light Emitting module 103 may emit Light in response to the driving current. The driving module 102 includes a first double-gate transistor T1, the first double-gate transistor T1 includes a top gate and a bottom gate, and the threshold voltage of the first double-gate transistor T1 has a negative correlation with the bottom gate voltage, that is, as the bottom gate voltage of the first double-gate transistor T1 increases, the threshold voltage of the first double-gate transistor T1 decreases; when the bottom gate voltage of the first double-gate transistor T1 decreases, the threshold voltage of the first double-gate transistor T1 increases, and therefore, the threshold adjusting module 107 can control the threshold voltage of the first double-gate transistor T1 by controlling the potential of the bottom gate of the first double-gate transistor T1, and adjust the threshold voltage of the first double-gate transistor T1, so that the adjusted threshold voltages of the first double-gate transistor T1 are kept consistent, and further, the driving currents generated by the first double-gate transistor T1 under the same gate voltage are not uneven due to the individual difference among the first double-gate transistors T1, thereby improving the display uniformity of the display panel.
Specifically, the first initialization module 106 may initialize the top gate of the first double-gate transistor T1 such that the top gate voltage of the first double-gate transistor T1 is the initialization signal Vref (i.e., the second initialization signal Vref2 in fig. 3), the first terminal of the first double-gate transistor T1 is, for example, connected to the first power signal VDD, which is, for example, a positive voltage signal, and the first power signal VDD may charge the first memory module 105 through the first double-gate transistor T1 and the threshold adjustment module 107 such that the bottom gate potential of the first double-gate transistor T1 is increased, thereby decreasing the threshold voltage Vth of the first double-gate transistor T1 until the threshold voltage Vth of the first double-gate transistor T1 is equal to the difference Vref-VDD between the top gate and the first terminal of the first double-gate transistor T1, the first double-gate transistor T1 is turned off, so that the threshold voltage of the first double-gate transistor T1 is equal to Vref-VDD, the threshold voltage Vth of the first double-gate transistor after being adjusted is kept consistent, so that the problem of low-temperature polysilicon is solvedThe transistor has a problem that the driving current is not uniform due to the non-uniformity of the intrinsic threshold voltage Vth0 caused by the process problem. The data writing module 101 further writes the data voltage signal Vdata into the top gate of the first double-gate transistor T1, the potential difference Vgs between the top gate of the first double-gate transistor T1 and the first end of the first double-gate transistor T1 is Vdata-VDD, and the driving current I generated by the first double-gate transistor T1 is K (Vgs-Vth) 2 ＝K[Vdata-VDD-(Vref-VDD)] 2 ＝K(Vdata-Vref) 2 K is a constant related to the driving module 102, so that the driving current generated by the driving module 102 is unrelated to the threshold voltage Vth of the driving module 102, and thus the driving current is related to the initialization signal Vref and the data voltage signal Vdata only, so that the effect of threshold compensation is achieved, and the driving current is unrelated to the first power signal VDD, so that the voltage drop loss of the first power signal VDD does not affect the magnitude of the driving current, so that the light emitting module 103 can better display the luminance to be displayed, the display uniformity of the display panel is improved, and the display effect of the display panel is improved.
In the technical solution of this embodiment, the pixel driving circuit includes: the data writing module, the driving module, the light emitting module, the second storage module, the first initialization module and the threshold value adjusting module are required, the light emitting module can emit light under the action of driving current, the driving module can generate corresponding driving current according to data voltage signals, and the light emitting module can respond to the driving current to emit light. The driving module comprises a first double-gate transistor, the first double-gate transistor comprises a top gate and a bottom gate, the threshold voltage of the first double-gate transistor is in a negative correlation with the bottom gate voltage, the threshold adjusting module can control the threshold voltage of the first double-gate transistor by controlling the potential of the bottom gate of the first double-gate transistor, the threshold voltage of the first double-gate transistor is compensated, the threshold voltages Vth of different first double-gate transistors after adjustment are kept consistent, the driving current generated by the first double-gate transistor cannot be uneven due to uneven intrinsic threshold voltage Vth0, and therefore the display uniformity of the display panel is improved. The technical scheme of the embodiment solves the problem that the driving current is not uniform due to the fact that the intrinsic threshold voltage Vth0 of the low-temperature polysilicon transistor is not uniform due to the process problem, and improves the display uniformity of the display panel.
Fig. 4 is a schematic circuit structure diagram of another pixel driving circuit provided in an embodiment of the present invention, and optionally, referring to fig. 4, the pixel driving circuit further includes: a second initialization module 108; the second initialization module 108 is used for initializing the light emitting module 103, and/or the second initialization module 108 is used for initializing the bottom gate of the first double-gate transistor T1 through the threshold adjustment module 107; preferably, the control terminal of the second initialization module 108 is connected to the first Scan signal Scan1, the first terminal of the second initialization module 108 is connected to the first initialization signal Vref1, the second terminal of the second initialization module 108 is electrically connected to the first terminal of the light emitting module 103, and the second terminal of the light emitting module 103 is connected to the second power signal VSS; the second end of the second initialization module 108 is also electrically connected to the first end of the threshold adjustment module 107.
Specifically, the second initialization module 108 may initialize the light emitting module 103, and may clear the charges remaining in the previous frame of picture, so that the light emitting module 103 may better display the luminance to be displayed. The second initializing module 108 may further initialize the bottom gate of the first double-gate transistor T1 through the threshold adjusting module 107, so as to clear the charges remaining on the bottom gate of the first double-gate transistor T1, facilitate controlling the potential of the bottom gate of the first double-gate transistor T1, facilitate controlling the threshold voltage of the first double-gate transistor T1, implement compensation on the threshold voltage, and improve the display uniformity of the display panel.
Alternatively, referring to fig. 4, the pixel driving circuit further includes: a light emitting control module 109, wherein the light emitting control module 109 is disposed between the driving module 102 and the light emitting module 103, and is configured to control the light emitting module 103 in a light emitting phase; preferably, a second terminal of the first dual-gate transistor T1 is electrically connected to a first terminal of the light emitting control module 109, a second terminal of the light emitting control module 109 is electrically connected to a first terminal of the light emitting module 102, and a control terminal of the light emitting control module 109 is connected to the enable signal EM. The control end of the threshold adjusting module 107 is connected to the second Scan signal Scan2, and the second end of the threshold adjusting module 107 is electrically connected to the bottom gate of the first double-gate transistor T1; the top gate of the first double-gate transistor T1 is electrically connected to the first end of the second memory module 104, and the second end of the second memory module 104 is connected to the first power signal VDD; the bottom gate of the first double-gate transistor T1 is electrically connected to the first end of the first memory module 105, and the second end of the first memory module 105 is connected to the first power signal VDD; the control end of the data writing module 101 is connected to the third Scan signal Scan3, the first end of the data writing module 101 is connected to the data voltage signal Vdata, and the second end of the data writing module 101 is electrically connected to the top gate of the first double-gate transistor T1; the first terminal of the first dual-gate transistor T1 is connected to the first power signal VDD, the control terminal of the first initialization module 106 is connected to the second Scan signal Scan2, the first terminal of the first initialization module 106 is connected to the second initialization signal Vref2, and the second terminal of the first initialization module 106 is electrically connected to the top gate of the first dual-gate transistor T1.
Specifically, in the initialization phase, after the first Scan signal Scan1 controls the second initialization module 108 to be turned on and the second Scan signal Scan2 controls the threshold adjustment module 107 to be turned on, the second initialization module 108 initializes the first end of the light emitting module 103, and the second initialization module 108 may also initialize the bottom gate of the first double-gate transistor T1 through the threshold adjustment module 107; after the second Scan signal Scan2 controls the first initialization module 106 to turn on, the first initialization module 106 may write the second initialization signal Vref2 into the top gate of the first double-gate transistor T1, and initialize the top gate of the first double-gate transistor T1, so that the top gate voltage of the first double-gate transistor T1 is the second initialization signal Vref 2; in the threshold adjustment stage, the second Scan signal Scan2 controls the threshold adjustment module 107 to be turned on, the first power signal VDD charges the first memory module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, such that the bottom gate potential of the first dual-gate transistor T1 is raised, the threshold voltage of the first dual-gate transistor T1 is lowered, until the threshold voltage Vth of the first dual-gate transistor T1 is equal to the voltage difference Vref2-VDD between the top gate and the first end of the first dual-gate transistor T1, the first dual-gate transistor T1 is turned off, the threshold voltage Vth of the first dual-gate transistor T1 is equal to Vref2-VDD, the threshold voltage of the first dual-gate transistor T1 is adjusted, and intrinsic threshold voltage unevenness caused by process problems of the low-temperature polysilicon transistor is solvedFirstly, the driving current is not uniform; in the data writing phase, after the data writing module 101 is controlled to be turned on by the third Scan signal Scan3, the data writing module 101 writes the data voltage signal Vdata into the top gate of the first double-gate transistor T1, so that the potential difference Vgs between the top gate of the first double-gate transistor T1 and the first end of the first double-gate transistor T1 is Vdata-VDD; then, in the light emitting period, the first double-gate transistor T1 generates the driving current I ═ K (Vgs-Vth) 2 ＝K[Vdata-VDD-(Vref2-VDD)] 2 ＝K(Vdata-Vref2) 2 The driving current is independent of the threshold voltage Vth of the driving module 102, so that the effect of threshold compensation is achieved. The first power signal VDD is, for example, a positive voltage signal, and the second power signal VSS is, for example, a negative voltage signal, so that when the light-emitting control module 109 is turned on, a required current path can be provided for the light-emitting module 103 to emit light in a light-emitting period, so that the light-emitting module 103 can emit light in response to the driving current to display the luminance to be displayed.
Optionally, the voltage value corresponding to the second initialization signal Vref2 is smaller than the voltage value corresponding to the first power signal VDD.
Specifically, the voltage value corresponding to the second initialization signal Vref2 is smaller than the voltage value corresponding to the first power signal VDD, that is, the potential of the top gate of the first double-gate transistor T1 is smaller than the potential of the first end of the first double-gate transistor T1, so that the first double-gate transistor T1 can be turned on, the first power signal VDD can charge the first memory module 105 through the first double-gate transistor T1 and the threshold adjustment module 107, so that the potential of the bottom gate of the first double-gate transistor T1 is increased, the threshold voltage of the first double-gate transistor is decreased, the threshold voltage of the first double-gate transistor T1 can be adjusted, the problem of non-uniform intrinsic threshold voltage caused by process problems of the low-temperature polysilicon transistor is solved, the driving current generated by the first double-gate transistor T1 is not non-uniform due to non-uniform intrinsic threshold voltage, and the display uniformity of the display panel is improved. The first power signal VDD is, for example, a positive voltage signal, the second initialization signal Vref2 is, for example, a positive voltage signal, the voltage value corresponding to the second initialization signal Vref2 is less than the voltage value corresponding to the first power signal VDD, so that the top gate potential of the first double-gate transistor T1 is not too low, and the potential difference between the top gate and the first terminal of the first double-gate transistor T1 is not too large, so that when the first memory module 105 is charged, the bottom gate potential of the first double-gate transistor T1 is increased, and the threshold voltage of the first double-gate transistor T1 can be decreased until the threshold voltage of the first double-gate transistor T1 is equal to the potential difference between the top gate and the first terminal of the first double-gate transistor T1; if the second initialization signal Vref2 is a negative voltage signal, the potential difference between the top gate and the first terminal of the first double-gate transistor T1 is too large, the threshold voltage of the first double-gate transistor T1 is difficult to decrease, and the control of the threshold voltage of the first double-gate transistor T1 is difficult to achieve.
In addition, since the second terminal of the first initialization signal Vref1 is connected to the second power signal VSS, which is, for example, a negative voltage signal, the first initialization signal Vref1 is a negative voltage signal and can initialize the light emitting module 103, and if the first initialization signal Vref1 is a positive voltage signal, the light emitting module 103 may be turned on to emit light in advance, so that the display panel cannot display the to-be-displayed image.
Fig. 5 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the invention, and optionally, referring to fig. 5, the second memory module 104 includes a second capacitor C2, a first terminal of the second capacitor C2 is a first terminal of the second memory module 104, and a second terminal of the second capacitor C2 is a second terminal of the second memory module 104; the first memory module 105 includes a first capacitor C1, a first terminal of the first capacitor C1 is a first terminal of the first memory module 105, and a second terminal of the first capacitor C1 is a second terminal of the first memory module 105.
Specifically, the second capacitor C2 may maintain the potential of the top gate of the driving module 102, and the second capacitor C2 may store the data voltage signal Vdata, so that the driving module 102 may generate the driving current according to the data voltage signal Vdata during the light emitting period. The first capacitor C1 may maintain the potential of the bottom gate of the driving module 102, such that when the first power signal VDD charges the first capacitor C1, the potential of the bottom gate of the driving module 102 may be changed to adjust the threshold voltage of the driving module 102.
Alternatively, referring to fig. 5, the threshold adjustment module 107 includes a second transistor T2; the first terminal of the second transistor T2 is the first terminal of the threshold adjustment module 107, the control terminal of the second transistor T2 is the control terminal of the threshold adjustment module 107, and the second terminal of the second transistor T2 is the second terminal of the threshold adjustment module 107.
Specifically, the second transistor T2 may control the potential of the bottom gate of the first double-gate transistor T1, so as to control the threshold voltage of the first double-gate transistor T1, and compensate the threshold voltage of the first double-gate transistor T1, so that the driving current generated by the first double-gate transistor T1 is not non-uniform due to the intrinsic threshold voltage non-uniformity, thereby improving the display uniformity of the display panel. The second transistor T2 is, for example, a P-type transistor, the first double-gate transistor T1 is, for example, a P-type transistor, which has a lower cost and is beneficial to reducing the cost of the display panel, and in some other embodiments, the second transistor T2 may also be an N-type transistor.
Alternatively, referring to fig. 5, the data writing module 101 includes a third transistor T3, a first terminal of the third transistor T3 is a first terminal of the data writing module 101, a second terminal of the third transistor T3 is a second terminal of the data writing module 101, and a control terminal of the third transistor T3 is a control terminal of the data writing module 101.
Specifically, the third transistor T3 may write the data voltage signal Vdata into the driving module 102, so that the driving module 102 may generate a driving current according to the data voltage signal Vdata, thereby allowing the light emitting module 103 to emit light according to the driving current, so that the light emitting module 103 may display luminance to be displayed. The third transistor T3 may be, for example, a P-type transistor, and in some other embodiments, the third transistor T3 may also be an N-type transistor.
Alternatively, referring to fig. 5, the first initialization block 106 includes a fourth transistor T4, a first terminal of the fourth transistor T4 is the first terminal of the first initialization block 106, a second terminal of the fourth transistor T4 is the second terminal of the first initialization block 106, and a control terminal of the fourth transistor T4 is the control terminal of the first initialization block 106; the second initialization block 108 includes a fifth transistor T5, a first terminal of the fifth transistor T5 is a first terminal of the second initialization block 108, a second terminal of the fifth transistor T5 is a second terminal of the second initialization block 108, and a control terminal of the fifth transistor T5 is a control terminal of the second initialization block 108. The fourth transistor T4 and the fifth transistor T5 are P-type transistors, for example, and in some other embodiments, the fourth transistor T4 and the fifth transistor T5 may also be N-type transistors.
Specifically, the fourth transistor T4 may write the second initialization signal Vref2 to the top gate of the driving module 102 to initialize the driving module 102. The fifth transistor T5 may write the first initialization signal Vref1 into the first end of the light emitting module 103, initialize the light emitting module 103, and eliminate the residual charges of a frame of picture on the light emitting module 103, so that the light emitting module 103 may better display the luminance to be displayed, and the display effect of the display panel is improved. The fifth transistor T5 may write the first initialization signal Vref1 into the bottom gate of the driving module 102 through the threshold adjustment module 107, initialize the bottom gate of the driving module 102, and achieve better control over the bottom gate of the driving module 102, thereby better adjusting the threshold voltage of the driving module 102.
On the basis of the foregoing embodiment, fig. 6 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention, and optionally, referring to fig. 6, the light-emitting control module 109 includes a sixth transistor T6, a first terminal of the sixth transistor T6 is a first terminal of the light-emitting control module 109, a control terminal of the sixth transistor T6 is a control terminal of the light-emitting control module 109, and a second terminal of the sixth transistor T6 is a second terminal of the light-emitting control module 109. The light emitting module 103 includes an organic light emitting diode D1, a first terminal of the organic light emitting diode D1 is a first terminal of the light emitting module 103, and a second terminal of the organic light emitting diode D1 is a second terminal of the light emitting module 103. The sixth transistor T6 is, for example, a P-type transistor, and in some other embodiments, the sixth transistor T6 may also be an N-type transistor.
Fig. 7 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 7, the driving method of the pixel driving circuit is used for driving the pixel driving circuit according to any of the above embodiments, and the driving method of the pixel driving circuit includes:
and S510, in an initialization stage, the first initialization module is conducted, and the first initialization module initializes the top gate of the driving module.
Specifically, referring to fig. 8 and fig. 4, at a stage T1, that is, an initialization stage, when the second Scan signal Scan2 is at a low level, the first initialization module 106 is turned on, the first initialization module 106 can write the second initialization signal Vref2 into the top gate of the first double-gate transistor T1, and initialize the top gate of the first double-gate transistor T1, so that the top gate voltage of the first double-gate transistor T1 is the second initialization signal Vref 2.
S520, in the threshold adjusting stage, the threshold adjusting module is conducted with the driving module, and the first power supply signal charges the first storage module through the driving module and the threshold adjusting module so as to control the potential of the bottom gate of the driving module and adjust the threshold voltage of the driving module.
Specifically, with continued reference to fig. 8 and fig. 4, in a stage T2, i.e., a threshold adjustment stage, the second Scan signal Scan2 is at a low level, the threshold adjustment module 107 is turned on, and the driving module 102 is turned on, the first power signal VDD charges the first memory module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, so that the bottom gate potential of the first dual-gate transistor T1 is raised, and thus the threshold voltage of the first dual-gate transistor T1 is lowered until the threshold voltage Vth of the first dual-gate transistor T1 is equal to the difference Vref2-VDD between the top gate and the first terminal voltage of the first dual-gate transistor T1, and the first dual-gate transistor T1 is turned off, so that the threshold voltage Vth of the first dual-gate transistor T1 is equal to Vref 2-VDD.
And S530, in the data writing stage, the data writing module is conducted, and the data writing module writes the data voltage signal into the driving module.
Specifically, with continued reference to fig. 8 and 4, at the stage T3, i.e., the data writing stage, the third Scan signal Scan3 is at a low level, the data writing module 101 is turned on, the data writing module 101 writes the data voltage signal Vdata into the top gate of the first double-gate transistor T1, and the potential difference Vgs between the top gate of the first double-gate transistor T1 and the first end of the first double-gate transistor T1 is Vdata-VDD, so that the problem of non-uniform driving current due to non-uniform intrinsic threshold voltage of the low-temperature polysilicon transistor caused by process problems is solved.
And S540, in the light emitting stage, the driving module is conducted, the driving module generates a driving current according to the data voltage signal, and the light emitting module responds to the driving current to emit light.
Specifically, with continued reference to fig. 8 and 4, during the period t4, i.e. the light emitting period, the second memory module 104 maintains the top gate voltage of the driving module 102 as the data voltage signal Vdata, the top gate voltage of the driving module 102 is lower than the voltage of the first terminal of the driving module 102, the driving module 102 is turned on, and the driving module 102 generates the driving current I ═ K (Vgs-Vth) 2 ＝K[Vdata-VDD-(Vref2-VDD)] 2 ＝K(Vdata-Vref2) 2 The light emitting module 103 emits light in response to the driving current, so that the driving current is independent of the threshold voltage Vth of the driving module 102, thereby achieving the effect of threshold compensation and enabling the light emitting module 103 to better display the brightness to be displayed.
Fig. 8 only shows a case where all the blocks are turned on at a low level, but the present invention is not limited thereto, and in some other embodiments, the types of the turn-on levels of the blocks may be opposite to those of the present embodiment.
Fig. 9 is a timing diagram corresponding to another pixel driving circuit provided by an embodiment of the present invention, and referring to fig. 9 and fig. 4, the driving method of the pixel driving circuit further includes: at the stage t1, i.e., during the initialization stage, the first Scan signal Scan1 is at a low level, the second initialization module 108 is turned on, and the second initialization module 108 can write the first initialization signal Vref1 into the first end of the light emitting module 103 to initialize the light emitting module 103. The second initialization module 108 may also initialize the bottom gate of the driver module 102 by the threshold adjustment module 107 writing the first initialization signal Vref1 to the bottom gate of the driver module 102.
Fig. 10 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 10, 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 regions defined by the scan lines and the data lines, the data lines may provide data voltage signals for the pixel driving circuits PX, so that light emitting modules in the pixel driving circuits PX can display luminance to be displayed according to the data voltage signals, and the scan lines may provide scan signals for the pixel driving circuits PX, thereby controlling on and off of the modules in the pixel driving circuits PX. The display panel comprises a substrate, a bottom gate metal layer, an active layer, a top gate metal layer and a power supply metal layer, wherein the bottom gate metal layer is located on the surface of the substrate, so that the bottom gate metal layer can isolate impurity charges on the substrate, and the display effect of the display panel is improved. Since the display panel includes the pixel driving circuit provided in any embodiment of the present invention, the same advantages are obtained, and further description is omitted here.
Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 11, 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 description is only exemplary of the invention and that the principles of the technology may be 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 (11)

1. A threshold adjustment circuit, comprising: the device comprises a first initialization module, a first double-gate transistor, a first storage module and a threshold adjusting module;
the first initialization module is electrically connected with the top gate of the first double-gate transistor and is used for initializing the top gate of the first double-gate transistor;
the first end of the first storage module is electrically connected with the bottom gate of the first double-gate transistor, and the first storage module is used for maintaining the potential of the bottom gate of the first double-gate transistor;
a first end of the first double-gate transistor is connected to a first power supply signal;
the first end of the threshold adjusting module is connected with the second end of the first double-gate transistor, the second end of the threshold adjusting module is electrically connected with the bottom gate of the first double-gate transistor, and the threshold adjusting module is used for controlling the potential of the bottom gate of the first double-gate transistor so as to adjust the threshold voltage of the first double-gate transistor.
2. A threshold adjustment method for implementing the threshold adjustment circuit of claim 1, the threshold adjustment method comprising:
in an initialization stage, a first initialization module is conducted, and the first initialization module initializes the top gate of a first double-gate transistor;
in a threshold adjustment stage, the threshold adjustment module and the first double-gate transistor are turned on, and a first power supply signal charges the first storage module through the first double-gate transistor and the threshold adjustment module to control the potential of the bottom gate of the first double-gate transistor, so as to adjust the threshold voltage of the first double-gate transistor.
3. A pixel driving circuit, comprising: the device comprises a data writing module, a driving module, a light emitting module, a first storage module, a second storage module, a first initialization module and a threshold adjusting module, wherein the driving module comprises a first double-gate transistor;
the data writing module is connected with the top gate of the first double-gate transistor and is used for writing a data voltage signal into the driving module;
a first end of the first double-gate transistor is connected to a first power supply signal, a second end of the first double-gate transistor is connected with a first end of the light emitting module, the driving module is used for generating driving current, and the light emitting module is used for responding to the driving current to emit light;
the top gate of the first double-gate transistor is connected with the second storage module, and the bottom gate of the first double-gate transistor is connected with the first storage module; the second storage module is used for maintaining the potential of the top gate of the first double-gate transistor, and the first storage module is used for maintaining the potential of the bottom gate of the first double-gate transistor;
the first initialization module is electrically connected with the top gate of the first double-gate transistor and is used for initializing the top gate of the first double-gate transistor;
the first end of the threshold adjusting module is connected with the second end of the first double-gate transistor, the second end of the threshold adjusting module is electrically connected with the bottom gate of the first double-gate transistor, and the threshold adjusting module is used for controlling the potential of the bottom gate of the first double-gate transistor so as to adjust the threshold voltage of the first double-gate transistor.
4. The pixel driving circuit according to claim 3, further comprising: a second initialization module;
the second initialization module is used for initializing the light emitting module, and/or the second initialization module is used for initializing the bottom gate of the first double-gate transistor through the threshold adjusting module;
preferably, a control end of the second initialization module is connected to a first scanning signal, a first end of the second initialization module is connected to the first initialization signal, a second end of the second initialization module is electrically connected to the first end of the light emitting module, and a second end of the light emitting module is connected to a second power signal;
the second end of the second initialization module is also electrically connected with the first end of the threshold adjusting module;
preferably, the second initialization module includes a fifth transistor, a first end of the fifth transistor is a first end of the second initialization module, a second end of the fifth transistor is a second end of the second initialization module, and a control end of the fifth transistor is a control end of the second initialization module.
5. The pixel driving circuit according to claim 3, wherein a control terminal of the first initialization module is connected to a second scan signal, a first terminal of the first initialization module is connected to a second initialization signal, and a second terminal of the first initialization module is electrically connected to the top gate of the first double-gate transistor;
preferably, the first initialization module includes a fourth transistor, a first end of the fourth transistor is a first end of the first initialization module, a second end of the fourth transistor is a second end of the first initialization module, and a control end of the fourth transistor is a control end of the first initialization module.
6. The pixel driving circuit according to claim 3, further comprising: the light-emitting control module is arranged between the driving module and the light-emitting module and is used for controlling the light-emitting module in a light-emitting stage;
preferably, the second end of the first double-gate transistor is electrically connected with the first end of the light emitting control module, the second end of the light emitting control module is electrically connected with the first end of the light emitting module, and the control end of the light emitting control module is connected to an enable signal.
7. The pixel driving circuit according to claim 3, wherein the top gate of the first double-gate transistor is electrically connected to the first terminal of the second memory module, and the second terminal of the second memory module is electrically connected to the first terminal of the first double-gate transistor;
and/or the bottom gate of the first double-gate transistor is electrically connected with the first end of the first memory module, and the second end of the first memory module is electrically connected with the first end of the first double-gate transistor;
preferably, the second storage module includes 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;
preferably, the first storage module includes 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.
8. The pixel driving circuit according to claim 3, wherein a control terminal of the threshold adjusting module is connected to a second scan signal, and the threshold adjusting module comprises a second transistor;
the first end of the second transistor is the first end of the threshold adjusting module, the control end of the second transistor is the control end of the threshold adjusting module, and the second end of the second transistor is the second end of the threshold adjusting module;
and/or a control end of the data writing module is connected with a third scanning signal, a first end of the data writing module is connected with a data voltage signal, and a second end of the data writing module is electrically connected with a top gate of the first double-gate transistor;
preferably, the data writing module includes a third transistor, a first end of the third transistor is a first end of the data writing module, a second end of the third transistor is a second end of the data writing module, and a control end of the third transistor is a control end of the data writing module.
9. The pixel driving circuit according to claim 5, wherein a voltage value corresponding to the second initialization signal is smaller than a voltage value corresponding to the first power supply signal.
10. A driving method of a pixel driving circuit, the driving method being for driving the pixel driving circuit according to any one of claims 3 to 9, the driving method comprising:
in an initialization stage, a first initialization module is conducted, and the first initialization module initializes a top gate of a driving module;
in a threshold adjusting stage, a threshold adjusting module is conducted with the driving module, and a first power supply signal charges the first storage module through the driving module and the threshold adjusting module to control the potential of a bottom gate of the driving module so as to adjust the threshold voltage of the driving module;
in a data writing stage, a data writing module is conducted, and the data writing module writes a data voltage signal into the driving module;
and in the light-emitting stage, the driving module is switched on, the driving module generates driving current according to the data voltage signal, and the light-emitting module responds to the driving current to emit light.
11. A display panel comprising the pixel drive circuit according to any one of claims 3 to 9.
CN202210713587.5A 2022-06-22 2022-06-22 Threshold adjusting circuit and method, pixel driving circuit and driving method thereof, and display panel Pending CN115101016A (en)

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