CN109285500B - Pixel driving circuit and organic light emitting display device - Google Patents
Pixel driving circuit and organic light emitting display device Download PDFInfo
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- CN109285500B CN109285500B CN201811480034.XA CN201811480034A CN109285500B CN 109285500 B CN109285500 B CN 109285500B CN 201811480034 A CN201811480034 A CN 201811480034A CN 109285500 B CN109285500 B CN 109285500B
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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
- 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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- 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
- G09G2320/0257—Reduction of after-image effects
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- Computer Hardware Design (AREA)
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- Control Of El Displays (AREA)
Abstract
The invention provides a pixel driving circuit and an organic light emitting display device. The pixel driving circuit comprises a driving transistor, a first light-emitting control transistor, a second light-emitting control transistor, an organic light-emitting element, a first power signal end, an emission signal end and a first node; the first node is electrically connected with the drain electrode of the driving transistor, and the first node is electrically connected with the first electrode of the second light-emitting control transistor; the pixel driving circuit also comprises a first reset transistor, a first scanning signal end and a first reset signal end; the grid electrode of the first reset transistor is electrically connected with the first scanning signal end, the first electrode of the first reset transistor is electrically connected with the first node, and the second electrode of the first reset transistor is electrically connected with the first reset signal end. The pixel driving circuit executes a first initialization stage, current flows through the driving transistor from the source electrode of the driving transistor to the drain electrode of the driving transistor, threshold voltage offset caused by bias stress is reduced, and hysteresis effect and ghost phenomenon are relieved.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of organic light emitting display technologies, and in particular, to a pixel driving circuit and an organic light emitting display device.
[ background of the invention ]
In the prior art, the organic light emitting display device has hysteresis effect and afterimage phenomenon.
[ summary of the invention ]
In order to solve the above technical problems, the present invention provides a pixel driving circuit and an organic light emitting display device.
In one aspect, the present invention provides a pixel driving circuit.
The pixel driving circuit comprises a driving transistor, a first light-emitting control transistor, a second light-emitting control transistor, an organic light-emitting element, a first power signal end, an emission signal end and a first node;
the first node is electrically connected with the drain electrode of the driving transistor, and the first node is electrically connected with the first electrode of the second light-emitting control transistor;
the driving transistor is used for generating a driving current according to the grid-source voltage of the driving transistor;
the first light-emitting control transistor is conducted under the control of the emission signal end, so that a signal of the first power supply signal end is transmitted to the source electrode of the driving transistor;
the second light-emitting control transistor is conducted under the control of the emission signal terminal, so that the driving current is transmitted to the anode of the organic light-emitting element;
the organic light-emitting element is used for emitting light according to the driving current;
the pixel driving circuit further comprises a first reset transistor, a first scanning signal end and a first reset signal end;
the grid electrode of the first reset transistor is electrically connected with the first scanning signal end, the first electrode of the first reset transistor is electrically connected with the first node, and the second electrode of the first reset transistor is electrically connected with the first reset signal end.
Optionally, the first reset transistor is turned on under the control of the first scan signal terminal, so that a signal of the first reset signal terminal is transmitted to the drain of the driving transistor.
Optionally, the pixel driving circuit further includes a second node, a second reset transistor, a second scan signal terminal, and a second reset signal terminal;
the second node is electrically connected with the source electrode of the driving transistor, and the second node is electrically connected with the first electrode of the first light-emitting control transistor;
the grid electrode of the second reset transistor is electrically connected with the second scanning signal end, the first electrode of the second reset transistor is electrically connected with the second node, and the second electrode of the second reset transistor is electrically connected with the second reset signal end.
Optionally, the second reset transistor is turned on under the control of the second scan signal terminal, so that a signal of the second reset signal terminal is transmitted to the source of the driving transistor.
Optionally, the pixel driving circuit further includes a first initialization transistor, a second initialization transistor, a reference signal terminal, a third scanning signal terminal, and a fourth scanning signal terminal;
the first initialization transistor is conducted under the control of the third scanning signal end, so that a signal of the reference signal end is transmitted to the grid electrode of the driving transistor;
the second initialization transistor is turned on under the control of the fourth scan signal terminal, so that the signal of the reference signal terminal is transmitted to the anode of the organic light emitting element.
Optionally, the pixel driving circuit performs a first initialization phase;
in the first initialization stage, the first reset transistor is turned on under the control of the first scan signal terminal, the second reset transistor is turned off under the control of the second scan signal terminal, the first initialization transistor is turned on under the control of the third scan signal terminal, and the second initialization transistor is turned off under the control of the fourth scan signal terminal.
Optionally, in the first initialization phase, the first reset signal terminal transmits a first potential to the drain of the driving transistor, and the reference signal terminal transmits the first potential to the gate of the driving transistor;
the first potential is smaller than the potential of the source electrode of the driving transistor at the initial moment of the first initialization phase, and the difference between the first potential and the potential is larger than the threshold voltage of the driving transistor.
Optionally, the pixel driving circuit performs a second initialization phase;
in the second initialization stage, the first reset transistor is turned off under the control of the first scan signal terminal, the second reset transistor is turned on under the control of the second scan signal terminal, the first initialization transistor is turned on under the control of the third scan signal terminal, and the second initialization transistor is turned off under the control of the fourth scan signal terminal.
Optionally, in the second initialization phase, the second reset signal terminal transmits a second potential to the source of the driving transistor, and the reference signal terminal transmits the second potential to the gate of the driving transistor;
the second potential is smaller than the potential of the drain of the driving transistor at the starting moment of the second initialization phase, and the difference between the second potential and the potential is larger than the threshold voltage of the driving transistor.
Optionally, the pixel driving circuit performs a third initialization phase;
in the third initialization phase, the first reset transistor is turned on under the control of the first scan signal terminal, the second reset transistor is turned on under the control of the second scan signal terminal, the first initialization transistor is turned on under the control of the third scan signal terminal, and the second initialization transistor is turned on under the control of the fourth scan signal terminal.
Optionally, in the third initialization phase, the first reset signal terminal transmits a third potential to the drain of the driving transistor, the second reset signal terminal transmits the third potential to the source of the driving transistor, the reference signal terminal transmits the third potential to the gate of the driving transistor, and the reference signal terminal transmits the third potential to the anode of the organic light emitting element;
wherein the third potential is less than the second potential.
In another aspect, the present invention provides a pixel driving circuit.
The pixel driving circuit comprises a driving transistor, a first reset transistor, a first initialization transistor, a second initialization transistor, a first data writing transistor, a second data writing transistor, a first light-emitting control transistor, a second light-emitting control transistor, a storage capacitor, an organic light-emitting element, a first reset signal end, a first scanning signal end, a third scanning signal end, a fourth scanning signal end, a fifth scanning signal end, an emission signal end, a data signal end, a first power supply signal end, a reference signal end and a first node;
the first node is electrically connected with the drain electrode of the driving transistor, and the first node is electrically connected with the first electrode of the second light-emitting control transistor;
the grid electrode of the first reset transistor is electrically connected with the first scanning signal end, the first electrode of the first reset transistor is electrically connected with the first node, and the second electrode of the first reset transistor is electrically connected with the first reset signal end;
the driving transistor is used for generating a driving current according to the grid-source voltage of the driving transistor;
the first initialization transistor is conducted under the control of the third scanning signal end, so that a signal of the reference signal end is transmitted to the grid electrode of the driving transistor;
the second initialization transistor is turned on under the control of the fourth scanning signal terminal, so that a signal of the reference signal terminal is transmitted to an anode of the organic light emitting element;
the first data writing transistor is conducted under the control of the fifth scanning signal end, so that the signal of the data signal end is transmitted to the source electrode of the driving transistor;
the second data writing transistor is used for detecting and compensating the threshold voltage of the driving transistor;
the first light-emitting control transistor is conducted under the control of the emission signal end, so that a signal of the first power supply signal end is transmitted to the source electrode of the driving transistor;
the second light-emitting control transistor is conducted under the control of the emission signal terminal, so that the driving current is transmitted to the anode of the organic light-emitting element;
the storage capacitor is used for detecting and compensating the threshold voltage of the driving transistor;
the organic light emitting element is used for emitting light according to the driving current.
In still another aspect, the present invention provides an organic light emitting display device.
The organic light emitting display device includes the pixel driving circuit.
In the invention, the pixel driving circuit executes a first initialization phase; in the first initialization stage, current flows through the driving transistor from the source electrode of the driving transistor to the drain electrode of the driving transistor, threshold voltage offset caused by bias stress is reduced, and hysteresis effect and ghost phenomenon are relieved; the pixel driving circuit executes a second initialization phase; in the second initialization stage, current flows through the driving transistor from the drain electrode of the driving transistor to the source electrode of the driving transistor, the current flows through the driving transistor for the second time after flowing through the driving transistor for the first time, the threshold voltage offset caused by bias stress is further reduced, the directions of the current flowing through the driving transistor for two times are opposite, and the threshold voltage offset caused by forward bias stress and the threshold voltage offset caused by reverse bias stress are reduced; the pixel driving circuit executes a third initialization phase; in the third initialization stage, the potential of the source electrode of the driving transistor, the potential of the drain electrode of the driving transistor, the potential of the gate electrode of the driving transistor and the potential of the anode of the organic light-emitting element are the same at the initial time of each frame, so that the influence of the jump of the potential of the source electrode of the driving transistor, the potential of the drain electrode of the driving transistor, the potential of the gate electrode of the driving transistor and the potential of the anode of the organic light-emitting element on the uniformity of the light-emitting intensity of the organic light-emitting element at the initial time of each.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of a pixel driving circuit 100 in the prior art;
fig. 2 is a circuit diagram of a pixel driving circuit 200 according to an embodiment of the invention;
FIG. 3 is a timing diagram of a pixel driving circuit 200 according to an embodiment of the invention;
FIG. 4 is a circuit diagram of another pixel driving circuit 200 according to another embodiment of the present invention;
FIG. 5 is a timing diagram of another pixel driving circuit 200 according to the present invention;
fig. 6 is a schematic plan view of an organic light emitting display device 300 according to an embodiment of the invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe nodes in embodiments of the present invention, these nodes should not be limited to these terms. These terms are only used to distinguish one node from another. For example, a first node may also be referred to as a second node, and similarly, a second node may also be referred to as a first node, without departing from the scope of embodiments of the present invention.
Fig. 1 is a circuit diagram of a pixel driving circuit 100 in the prior art.
As shown in fig. 1, the pixel driving circuit 100 includes a first transistor T101, a second transistor T102, a third transistor T103, a fourth transistor T104, a fifth transistor T105, a sixth transistor T106, a seventh transistor T107, a storage capacitor C101, an organic light emitting element D101, a first SCAN signal terminal SCAN101, a second SCAN signal terminal SCAN102, an emission signal terminal EMIT, a DATA signal terminal DATA, a first power signal terminal PVDD, a second power signal terminal PVEE, a reference signal terminal VREF, a first node N101, a second node N102, wherein the third transistor T103 drives the organic light emitting element D101 to EMIT light.
The inventor of the present invention has found that, in the prior art, the third transistor T103 drives the organic light emitting device D101 to emit light, and the third transistor T103 is forward biased or reverse biased for a long time, so that the bias stress causes the threshold voltage to shift, which causes the hysteresis effect and the image sticking phenomenon; in addition, the gate of the driving transistor T103 and the anode of the organic light emitting device D101 are initialized by the reference signal terminal VREF, the source of the driving transistor T103 and the drain of the driving transistor T103 are not initialized by the reference signal terminal VREF, and the potential of the source of the driving transistor T103 and the potential of the drain of the driving transistor T103 jump at the initial time of each frame to affect the uniformity of the light emitting intensity of the organic light emitting device D101.
In order to solve the above technical problems, embodiments of the present invention provide a pixel driving circuit and an organic light emitting display device.
Fig. 2 is a circuit diagram of a pixel driving circuit 200 according to an embodiment of the invention.
As shown in fig. 2, in the embodiment of the present invention, the pixel driving circuit 200 includes a driving transistor T203, a first emission control transistor T201, a second emission control transistor T206, an organic light emitting element D201, a first power signal terminal PVDD, an emission signal terminal EMIT, a first node N201;
the first node N201 is electrically connected to the drain of the driving transistor T203, and the first node N201 is electrically connected to the first electrode of the second emission control transistor T206;
the driving transistor T203 is configured to generate a driving current according to a gate-source voltage of the driving transistor T203;
the first emission control transistor T201 is turned on under the control of the emission signal terminal EMIT, so that the signal of the first power signal terminal PVDD is transmitted to the source of the driving transistor T203;
the second light emission control transistor T206 is turned on under the control of the emission signal terminal EMIT so that the driving current is transmitted to the anode of the organic light emitting element D201;
the organic light emitting element D201 is for emitting light according to a drive current;
the pixel driving circuit 200 further includes a first RESET transistor T208, a first SCAN signal terminal SCAN201, a first RESET signal terminal RESET 201;
a gate of the first RESET transistor T208 is electrically connected to the first SCAN signal terminal SCAN201, a first electrode of the first RESET transistor T208 is electrically connected to the first node N201, and a second electrode of the first RESET transistor T208 is electrically connected to the first RESET signal terminal RESET 201.
As shown in fig. 2, the pixel driving circuit 200 further includes a first initialization transistor T205, a second initialization transistor T207, a first DATA writing transistor T202, a second DATA writing transistor T204, a storage capacitor C201, a third SCAN signal terminal SCAN203, a fourth SCAN signal terminal SCAN204, a fifth SCAN signal terminal SCAN205, a DATA signal terminal DATA, a second power signal terminal PVEE, a reference signal terminal VREF, and a second node N202.
The control electrode of the first initialization transistor T205 is electrically connected to the third SCAN signal terminal SCAN203, the first electrode of the first initialization transistor T205 is electrically connected to the reference signal terminal VREF, and the second electrode of the first initialization transistor T205 is electrically connected to the gate electrode of the driving transistor T203. The first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, so that the signal of the reference signal terminal VREF is transmitted to the gate of the driving transistor T203.
The control electrode of the second initialization transistor T207 is electrically connected to the fourth SCAN signal terminal SCAN204, the first electrode of the second initialization transistor T207 is electrically connected to the reference signal terminal VREF, and the second electrode of the second initialization transistor T207 is electrically connected to the anode electrode of the organic light emitting element D201. The second initialization transistor T207 is turned on under the control of the fourth SCAN signal terminal SCAN204, so that the signal of the reference signal terminal VREF is transmitted to the anode of the organic light emitting element D201.
A control electrode of the first DATA writing transistor T202 is electrically connected to the fifth SCAN signal terminal SCAN205, a first electrode of the first DATA writing transistor T202 is electrically connected to the DATA signal terminal DATA, and a second electrode of the first DATA writing transistor T202 is electrically connected to the source electrode of the driving transistor T203. The first DATA writing transistor T202 is turned on under the control of the fifth SCAN signal terminal SCAN205, so that the signal of the DATA signal terminal DATA is transmitted to the source of the driving transistor T203.
A control electrode of the second data writing transistor T204 is electrically connected to the fifth SCAN signal terminal SCAN205, a first electrode of the second data writing transistor T204 is electrically connected to the drain electrode of the driving transistor T203, and a second electrode of the second data writing transistor T204 is electrically connected to the gate electrode of the driving transistor T203. The second data writing transistor T204 is turned on under the control of the fifth SCAN signal terminal SCAN205, and detects and compensates the threshold voltage of the driving transistor T203.
A control electrode of the first light emission controlling transistor T201 is electrically connected to the emission signal terminal EMIT, a first electrode of the first light emission controlling transistor T201 is electrically connected to the source of the driving transistor T203, and a second electrode of the first light emission controlling transistor T201 is electrically connected to the first power supply signal terminal PVDD. The first emission control transistor T201 is turned on under the control of the emission signal terminal EMIT, so that the signal of the first power signal terminal PVDD is transmitted to the source of the driving transistor T203.
A control electrode of the second light emission control transistor T206 is electrically connected to the emission signal terminal EMIT, a first electrode of the second light emission control transistor T206 is electrically connected to the drain electrode of the driving transistor T203, and a second electrode of the second light emission control transistor T206 is electrically connected to the anode electrode of the organic light emitting element D201. The second light emission control transistor T206 is turned on under the control of the emission signal terminal EMIT so that the driving current is transmitted to the anode of the organic light emitting element D201.
A first electrode of the storage capacitor C201 is electrically connected to the first power signal terminal PVDD, and a second electrode of the storage capacitor C201 is electrically connected to the gate of the driving transistor T203. The storage capacitor C201 is used to detect and compensate the threshold voltage of the driving transistor T203.
The cathode of the organic light emitting element D201 is electrically connected to the second power signal terminal PVEE.
In the embodiment of the present invention, the driving transistor T203, the first light emission controlling transistor T201, the second light emission controlling transistor T206, the first initializing transistor T205, the second initializing transistor T207, the first data writing transistor T202, the second data writing transistor T204, and the first resetting transistor T208 are all PMOS transistors, turned on when the potential of the gate is a low potential and turned off when the potential of the gate is a high potential.
Fig. 3 is a timing diagram of a pixel driving circuit 200 according to an embodiment of the invention.
As shown in fig. 3, in the embodiment of the present invention, the pixel driving circuit 200 performs the first initialization phase P1: the first reset transistor T208 is turned on under the control of the first SCAN signal terminal SCAN201, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned off under the control of the fourth SCAN signal terminal SCAN 204; the first RESET signal terminal RESET201 transmits the first potential to the drain of the driving transistor T203, and the reference signal terminal VREF transmits the first potential to the gate of the driving transistor T203; the first potential is smaller than the potential of the source of the driving transistor T203 at the start time of the first initialization period P1, and the difference between the two is larger than the threshold voltage of the driving transistor T203. In the first initialization phase P1, a current flows through the driving transistor T203 from the source of the driving transistor T203 to the drain of the driving transistor T203, so that the threshold voltage shift caused by the bias stress is reduced, and the hysteresis effect and the image sticking phenomenon are alleviated.
In the embodiment of the present invention, the first RESET transistor T208 is turned on under the control of the first SCAN signal terminal SCAN201, so that the signal of the first RESET signal terminal RESET201 is transmitted to the drain of the driving transistor T203. After the pixel driving circuit 200 performs the first initialization phase P1, the pixel driving circuit 200 performs the third initialization phase P3: the first reset transistor T208 is turned on under the control of the first SCAN signal terminal SCAN201, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned on under the control of the fourth SCAN signal terminal SCAN 204; the first RESET signal terminal RESET201 transmits the third potential to the drain of the driving transistor T203, the reference signal terminal VREF transmits the third potential to the gate of the driving transistor T203, and the reference signal terminal VREF transmits the third potential to the anode of the organic light emitting device D201. The third initialization phase P3 makes the potential of the drain of the driving transistor T203, the potential of the gate of the driving transistor T203, and the potential of the anode of the organic light emitting element D201 be the lower third potential at the initial time of each frame, so as to avoid the influence of the jump of the potential of the drain of the driving transistor T203, the potential of the gate of the driving transistor T203, and the potential of the anode of the organic light emitting element D201 at the initial time of each frame on the uniformity of the light emitting intensity of the organic light emitting element D201.
Fig. 4 is a circuit diagram of another pixel driving circuit 200 according to an embodiment of the invention.
As shown in fig. 4, in the embodiment of the present invention, the pixel driving circuit 200 further includes a second node N202, a second RESET transistor T209, a second SCAN signal terminal SCAN202, a second RESET signal terminal RESET 202; the second node N202 is electrically connected to the source of the driving transistor T203, and the second node N202 is electrically connected to the first electrode of the first light emission control transistor T201; a gate of the second RESET transistor T209 is electrically connected to the second SCAN signal terminal SCAN202, a first electrode of the second RESET transistor T209 is electrically connected to the second node N202, and a second electrode of the second RESET transistor T209 is electrically connected to the second RESET signal terminal RESET 202.
In the embodiment of the present invention, the driving transistor T203, the first light emission controlling transistor T201, the second light emission controlling transistor T206, the first initializing transistor T205, the second initializing transistor T207, the first data writing transistor T202, the second data writing transistor T204, the first resetting transistor T208, and the second resetting transistor T209 are all PMOS transistors, and are turned on when the potential of the gate is a low potential and turned off when the potential of the gate is a high potential.
Fig. 5 is a timing diagram of another pixel driving circuit 200 according to an embodiment of the invention.
As shown in fig. 5, in the embodiment of the present invention, the pixel driving circuit 200 performs the first initialization phase P1: the first reset transistor T208 is turned on under the control of the first SCAN signal terminal SCAN201, the second reset transistor T209 is turned off under the control of the second SCAN signal terminal SCAN202, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned off under the control of the fourth SCAN signal terminal SCAN 204; the first RESET signal terminal RESET201 transmits the first potential to the drain of the driving transistor T203, and the reference signal terminal VREF transmits the first potential to the gate of the driving transistor T203; the first potential is smaller than the potential of the source of the driving transistor T203 at the start time of the first initialization period P1, and the difference between the two is larger than the threshold voltage of the driving transistor T203. Then, the pixel driving circuit 200 performs the second initialization phase P2: the first reset transistor T208 is turned off under the control of the first SCAN signal terminal SCAN201, the second reset transistor T209 is turned on under the control of the second SCAN signal terminal SCAN202, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned off under the control of the fourth SCAN signal terminal SCAN 204; the second RESET signal terminal RESET202 transmits the second potential to the source of the driving transistor T203, and the reference signal terminal VREF transmits the second potential to the gate of the driving transistor T203; the second potential is smaller than the potential of the drain of the driving transistor T203 at the start time of the second initialization period P2, and the difference between the two is larger than the threshold voltage of the driving transistor T203. Then, in the first initialization phase P1, a current flows through the driving transistor T203 from the source of the driving transistor T203 to the drain of the driving transistor T203; in the second initialization phase P2, a current flows through the driving transistor T203 from the drain of the driving transistor T203 to the source of the driving transistor T203; the current flows through the driving transistor T203 for the second time after flowing through the driving transistor T203 for the first time, and further eliminates the threshold voltage shift caused by the bias stress; the direction of the current flowing through the driving transistor T203 twice is opposite, and both the threshold voltage shift caused by the forward bias stress and the threshold voltage shift caused by the reverse bias stress are absorbed.
In the embodiment of the present invention, the second RESET transistor T209 is turned on under the control of the second SCAN signal terminal SCAN202, so that the signal of the second RESET signal terminal RESET202 is transmitted to the source of the driving transistor T203. After the pixel driving circuit 200 performs the first initialization phase P1 and the second initialization phase P2, the pixel driving circuit 200 performs the third initialization phase P3: the first reset transistor T208 is turned on under the control of the first SCAN signal terminal SCAN201, the second reset transistor T209 is turned on under the control of the second SCAN signal terminal SCAN202, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned on under the control of the fourth SCAN signal terminal SCAN 204; the first RESET signal terminal RESET201 transmits a third potential to the drain of the driving transistor T203, the second RESET signal terminal RESET202 transmits the third potential to the source of the driving transistor T203, the reference signal terminal VREF transmits the third potential to the gate of the driving transistor T203, and the reference signal terminal VREF transmits the third potential to the anode of the organic light emitting device D201; wherein the third potential is less than the second potential. The third initialization phase P3 makes the potential of the source of the driving transistor T203, the potential of the drain of the driving transistor T203, the potential of the gate of the driving transistor T203, and the potential of the anode of the organic light emitting element D201 be the lower third potential at the initial time of each frame, thereby avoiding the influence of the jump of the potential of the source of the driving transistor T203, the potential of the drain of the driving transistor T203, the potential of the gate of the driving transistor T203, and the potential of the anode of the organic light emitting element D201 at the initial time of each frame on the uniformity of the light emitting intensity of the organic light emitting element D201.
In the embodiment of the present invention, the pixel driving circuit 200 further includes a first initialization transistor T205, a second initialization transistor T207, a reference signal terminal VREF, a third SCAN signal terminal SCAN203, a fourth SCAN signal terminal SCAN 204; the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, so that the signal of the reference signal terminal VREF is transmitted to the gate of the driving transistor T203; the second initialization transistor T207 is turned on under the control of the fourth SCAN signal terminal SCAN204, so that the signal of the reference signal terminal VREF is transmitted to the anode of the organic light emitting element D201.
As shown in fig. 5, in the embodiment of the present invention, the pixel driving circuit 200 performs the first initialization phase P1; in the first initialization phase P1, the first reset transistor T208 is turned on under the control of the first SCAN signal terminal SCAN201, the second reset transistor T209 is turned off under the control of the second SCAN signal terminal SCAN202, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned off under the control of the fourth SCAN signal terminal SCAN 204; this causes the first RESET signal terminal RESET201 to transmit the first potential to the drain of the driving transistor T203, and causes the reference signal terminal VREF to transmit the first potential to the gate of the driving transistor T203.
In the embodiment of the present invention, in the first initialization phase P1, the first RESET signal terminal RESET201 transmits the first potential to the drain of the driving transistor T203, and the reference signal terminal VREF transmits the first potential to the gate of the driving transistor T203; the first potential is smaller than the potential of the source of the driving transistor T203 at the start time of the first initialization period P1, and the difference between the two is larger than the threshold voltage of the driving transistor T203. In the first initialization phase P1, a current flows through the driving transistor T203 from the source of the driving transistor T203 to the drain of the driving transistor T203, so that the threshold voltage shift caused by the bias stress is reduced, and the hysteresis effect and the image sticking phenomenon are alleviated.
As shown in fig. 5, in the embodiment of the present invention, the pixel driving circuit 200 performs the second initialization phase P2; in the second initialization phase P2, the first reset transistor T208 is turned off under the control of the first SCAN signal terminal SCAN201, the second reset transistor T209 is turned on under the control of the second SCAN signal terminal SCAN202, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned off under the control of the fourth SCAN signal terminal SCAN 204; this causes the second RESET signal terminal RESET202 to transmit the second potential to the source of the driving transistor T203, and causes the reference signal terminal VREF to transmit the second potential to the gate of the driving transistor T203.
In the embodiment of the present invention, during the second initialization phase P2, the second RESET signal terminal RESET202 transmits the second potential to the source of the driving transistor T203, and the reference signal terminal VREF transmits the second potential to the gate of the driving transistor T203; the second potential is smaller than the potential of the drain of the driving transistor T203 at the start time of the second initialization period P2, and the difference between the two is larger than the threshold voltage of the driving transistor T203. The second initialization phase P2 follows the first initialization phase P1. In the first initialization phase P1 and the second initialization phase P2, the current flows through the driving transistor T203 for the second time after flowing through the driving transistor T203 for the first time, so as to further reduce the threshold voltage shift caused by the bias stress; the direction of the current flowing through the driving transistor T203 twice is opposite, and both the threshold voltage shift caused by the forward bias stress and the threshold voltage shift caused by the reverse bias stress are absorbed.
As shown in fig. 5, in the embodiment of the present invention, the pixel driving circuit 200 performs the third initialization phase P3; in the third initialization phase P3, the first reset transistor T208 is turned on under the control of the first SCAN signal terminal SCAN201, the second reset transistor T209 is turned on under the control of the second SCAN signal terminal SCAN202, the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, and the second initialization transistor T207 is turned on under the control of the fourth SCAN signal terminal SCAN 204; this causes the first RESET signal terminal RESET201 to transmit the third potential to the drain of the driving transistor T203, the second RESET signal terminal RESET202 to transmit the third potential to the source of the driving transistor T203, the reference signal terminal VREF to transmit the third potential to the gate of the driving transistor T203, and the reference signal terminal VREF to transmit the third potential to the anode of the organic light emitting element D201.
In the embodiment of the present invention, in the third initialization phase P3, the first RESET signal terminal RESET201 transmits the third potential to the drain of the driving transistor T203, the second RESET signal terminal RESET202 transmits the third potential to the source of the driving transistor T203, the reference signal terminal VREF transmits the third potential to the gate of the driving transistor T203, and the reference signal terminal VREF transmits the third potential to the anode of the organic light emitting device D201; wherein the third potential is less than the second potential. The third initialization phase P3 follows the first initialization phase P1 and the second initialization phase P2. The third initialization phase P3 makes the potential of the source of the driving transistor T203, the potential of the drain of the driving transistor T203, the potential of the gate of the driving transistor T203, and the potential of the anode of the organic light emitting element D201 be the lower third potential at the initial time of each frame, thereby avoiding the influence of the jump of the potential of the source of the driving transistor T203, the potential of the drain of the driving transistor T203, the potential of the gate of the driving transistor T203, and the potential of the anode of the organic light emitting element D201 at the initial time of each frame on the uniformity of the light emitting intensity of the organic light emitting element D201.
The pixel driving circuit 200 performs the data writing phase and the light emitting phase after performing the first initialization phase P1, the second initialization phase P2, and the third initialization phase P3. In the DATA writing phase, the first DATA writing transistor T202 is turned on under the control of the fifth SCAN signal terminal SCAN205, so that the signal of the DATA signal terminal DATA is transmitted to the source of the driving transistor T203; the second data writing transistor T204 is turned on under the control of the fifth SCAN signal terminal SCAN205, and detects and compensates the threshold voltage of the driving transistor T203. In the light emitting phase, the first light emitting control transistor T201 is turned on under the control of the emission signal terminal EMIT, so that the signal of the first power signal terminal PVDD is transmitted to the source of the driving transistor T203; the second light emission control transistor T206 is turned on under the control of the emission signal terminal EMIT so that the driving current is transmitted to the anode of the organic light emitting element D201; the organic light emitting element D201 emits light according to the driving current. The pixel driving circuit 200 sequentially and cyclically executes a first initialization phase P1, a second initialization phase P2, a third initialization phase P3, a data writing phase, and a light emitting phase.
As shown in fig. 5, in the embodiment of the present invention, the pixel driving circuit 200 includes a driving transistor T203, a first RESET transistor T208, a first initialization transistor T205, a second initialization transistor T207, a first DATA write transistor T202, a second DATA write transistor T204, a first light emission control transistor T201, a second light emission control transistor T206, a storage capacitor C201, an organic light emitting element D201, a first RESET signal terminal RESET201, a first SCAN signal terminal SCAN201, a third SCAN signal terminal SCAN203, a fourth SCAN signal terminal SCAN204, a fifth SCAN signal terminal SCAN205, an emission signal terminal EMIT, a DATA signal terminal DATA, a first power signal terminal PVDD, a reference signal terminal VREF, a first node N201;
the first node N201 is electrically connected to the drain of the driving transistor T203, and the first node N201 is electrically connected to the first electrode of the second emission control transistor T206;
a gate electrode of the first RESET transistor T208 is electrically connected to the first SCAN signal terminal SCAN201, a first electrode of the first RESET transistor T208 is electrically connected to the first node N201, and a second electrode of the first RESET transistor T208 is electrically connected to the first RESET signal terminal RESET 201;
the driving transistor T203 is configured to generate a driving current according to a gate-source voltage of the driving transistor T203;
the first initialization transistor T205 is turned on under the control of the third SCAN signal terminal SCAN203, so that the signal of the reference signal terminal VREF is transmitted to the gate of the driving transistor T203;
the second initialization transistor T207 is turned on under the control of the fourth SCAN signal terminal SCAN204, so that the signal of the reference signal terminal VREF is transmitted to the anode of the organic light emitting element D201;
the first DATA writing transistor T202 is turned on under the control of the fifth SCAN signal terminal SCAN205, so that the signal of the DATA signal terminal DATA is transmitted to the source of the driving transistor T203;
the second data writing transistor T204 is used for detecting and compensating the threshold voltage of the driving transistor T203;
the first emission control transistor T201 is turned on under the control of the emission signal terminal EMIT, so that the signal of the first power signal terminal PVDD is transmitted to the source of the driving transistor T203;
the second light emission control transistor T206 is turned on under the control of the emission signal terminal EMIT so that the driving current is transmitted to the anode of the organic light emitting element D201;
the storage capacitor C201 is used for detecting and compensating the threshold voltage of the driving transistor T203;
the organic light emitting element D201 is for emitting light according to a driving current.
Fig. 6 is a schematic plan view of an organic light emitting display device 300 according to an embodiment of the invention.
As shown in fig. 6, in an embodiment of the present invention, the organic light emitting display device 300 includes a pixel driving circuit 200. The organic light emitting display device 300 is an electronic device such as a smart phone, a flat panel television, or the like. The pixel driving circuit 200 is described above and will not be described in detail.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A pixel driving circuit is characterized by comprising a driving transistor, a first light-emitting control transistor, a second light-emitting control transistor, an organic light-emitting element, a first power signal terminal, an emission signal terminal and a first node;
the first node is electrically connected with the drain electrode of the driving transistor, and the first node is electrically connected with the first electrode of the second light-emitting control transistor;
the driving transistor is used for generating a driving current according to the grid-source voltage of the driving transistor;
the first light-emitting control transistor is conducted under the control of the emission signal end, so that a signal of the first power supply signal end is transmitted to the source electrode of the driving transistor;
the second light-emitting control transistor is conducted under the control of the emission signal terminal, so that the driving current is transmitted to the anode of the organic light-emitting element;
the organic light-emitting element is used for emitting light according to the driving current;
the pixel driving circuit further comprises a first reset transistor, a first scanning signal end and a first reset signal end;
the grid electrode of the first reset transistor is electrically connected with the first scanning signal end, the first electrode of the first reset transistor is electrically connected with the first node, and the second electrode of the first reset transistor is electrically connected with the first reset signal end;
the pixel driving circuit further comprises a second node, a second reset transistor, a second scanning signal end and a second reset signal end;
the second node is electrically connected with the source electrode of the driving transistor, and the second node is electrically connected with the first electrode of the first light-emitting control transistor;
a grid electrode of the second reset transistor is electrically connected with the second scanning signal end, a first electrode of the second reset transistor is electrically connected with the second node, and a second electrode of the second reset transistor is electrically connected with the second reset signal end;
the pixel driving circuit further comprises a first initialization transistor, a second initialization transistor, a reference signal end, a third scanning signal end and a fourth scanning signal end;
the first initialization transistor is conducted under the control of the third scanning signal end, so that a signal of the reference signal end is transmitted to the grid electrode of the driving transistor;
the second initialization transistor is turned on under the control of the fourth scanning signal terminal, so that a signal of the reference signal terminal is transmitted to an anode of the organic light emitting element;
the pixel driving circuit executes a first initialization phase;
in the first initialization stage, the first reset transistor is turned on under the control of the first scan signal terminal, the second reset transistor is turned off under the control of the second scan signal terminal, the first initialization transistor is turned on under the control of the third scan signal terminal, and the second initialization transistor is turned off under the control of the fourth scan signal terminal.
2. The pixel driving circuit according to claim 1, wherein the first reset transistor is turned on under control of the first scan signal terminal, so that a signal of the first reset signal terminal is transmitted to the drain of the driving transistor.
3. The pixel driving circuit according to claim 2, wherein the second reset transistor is turned on under control of the second scan signal terminal, so that a signal of the second reset signal terminal is transmitted to the source of the driving transistor.
4. The pixel driving circuit according to claim 1, wherein in the first initialization phase, the first reset signal terminal transmits a first potential to the drain of the driving transistor, and the reference signal terminal transmits the first potential to the gate of the driving transistor;
the first potential is smaller than the potential of the source electrode of the driving transistor at the initial moment of the first initialization phase, and the difference between the first potential and the potential is larger than the threshold voltage of the driving transistor.
5. The pixel driving circuit according to claim 1, wherein the pixel driving circuit performs a second initialization phase;
in the second initialization stage, the first reset transistor is turned off under the control of the first scan signal terminal, the second reset transistor is turned on under the control of the second scan signal terminal, the first initialization transistor is turned on under the control of the third scan signal terminal, and the second initialization transistor is turned off under the control of the fourth scan signal terminal.
6. The pixel driving circuit according to claim 5, wherein in the second initialization phase, the second reset signal terminal transmits a second potential to the source of the driving transistor, and the reference signal terminal transmits the second potential to the gate of the driving transistor;
the second potential is smaller than the potential of the drain of the driving transistor at the starting moment of the second initialization phase, and the difference between the second potential and the potential is larger than the threshold voltage of the driving transistor.
7. The pixel driving circuit according to claim 6, wherein the pixel driving circuit performs a third initialization phase;
in the third initialization phase, the first reset transistor is turned on under the control of the first scan signal terminal, the second reset transistor is turned on under the control of the second scan signal terminal, the first initialization transistor is turned on under the control of the third scan signal terminal, and the second initialization transistor is turned on under the control of the fourth scan signal terminal.
8. The pixel driving circuit according to claim 7, wherein in the third initialization phase, the first reset signal terminal transmits a third potential to the drain of the driving transistor, the second reset signal terminal transmits the third potential to the source of the driving transistor, the reference signal terminal transmits the third potential to the gate of the driving transistor, and the reference signal terminal transmits the third potential to the anode of the organic light emitting element;
wherein the third potential is less than the second potential.
9. A pixel driving circuit is characterized by comprising a driving transistor, a first reset transistor, a first initialization transistor, a second initialization transistor, a first data writing transistor, a second data writing transistor, a first light-emitting control transistor, a second light-emitting control transistor, a storage capacitor, an organic light-emitting element, a first reset signal end, a first scanning signal end, a third scanning signal end, a fourth scanning signal end, a fifth scanning signal end, an emitting signal end, a data signal end, a first power supply signal end, a reference signal end and a first node;
the first node is electrically connected with the drain electrode of the driving transistor, and the first node is electrically connected with the first electrode of the second light-emitting control transistor;
the grid electrode of the first reset transistor is electrically connected with the first scanning signal end, the first electrode of the first reset transistor is electrically connected with the first node, and the second electrode of the first reset transistor is electrically connected with the first reset signal end;
the driving transistor is used for generating a driving current according to the grid-source voltage of the driving transistor;
the first initialization transistor is conducted under the control of the third scanning signal end, so that a signal of the reference signal end is transmitted to the grid electrode of the driving transistor;
the second initialization transistor is turned on under the control of the fourth scanning signal terminal, so that a signal of the reference signal terminal is transmitted to an anode of the organic light emitting element;
the first data writing transistor is conducted under the control of the fifth scanning signal end, so that the signal of the data signal end is transmitted to the source electrode of the driving transistor;
the second data writing transistor is used for detecting and compensating the threshold voltage of the driving transistor;
the first light-emitting control transistor is conducted under the control of the emission signal end, so that a signal of the first power supply signal end is transmitted to the source electrode of the driving transistor;
the second light-emitting control transistor is conducted under the control of the emission signal terminal, so that the driving current is transmitted to the anode of the organic light-emitting element;
the storage capacitor is used for detecting and compensating the threshold voltage of the driving transistor;
the organic light-emitting element is used for emitting light according to the driving current;
the pixel driving circuit further comprises a second node, a second reset transistor, a second scanning signal end and a second reset signal end;
the second node is electrically connected with the source electrode of the driving transistor, and the second node is electrically connected with the first electrode of the first light-emitting control transistor;
a grid electrode of the second reset transistor is electrically connected with the second scanning signal end, a first electrode of the second reset transistor is electrically connected with the second node, and a second electrode of the second reset transistor is electrically connected with the second reset signal end;
the pixel driving circuit further comprises a first initialization transistor, a second initialization transistor, a reference signal end, a third scanning signal end and a fourth scanning signal end;
the first initialization transistor is conducted under the control of the third scanning signal end, so that a signal of the reference signal end is transmitted to the grid electrode of the driving transistor;
the second initialization transistor is turned on under the control of the fourth scanning signal terminal, so that a signal of the reference signal terminal is transmitted to an anode of the organic light emitting element;
the pixel driving circuit executes a first initialization phase;
in the first initialization stage, the first reset transistor is turned on under the control of the first scan signal terminal, the second reset transistor is turned off under the control of the second scan signal terminal, the first initialization transistor is turned on under the control of the third scan signal terminal, and the second initialization transistor is turned off under the control of the fourth scan signal terminal.
10. An organic light-emitting display device, characterized in that it comprises the pixel drive circuit according to any one of claims 1 to 8.
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| CN201811480034.XA CN109285500B (en) | 2018-12-05 | 2018-12-05 | Pixel driving circuit and organic light emitting display device |
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| CN107492343B (en) * | 2017-08-18 | 2020-06-09 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit for OLED display device and OLED display device |
| CN108807485B (en) * | 2018-06-25 | 2020-12-29 | 武汉天马微电子有限公司 | A display panel and display device |
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| US12198626B2 (en) * | 2020-10-15 | 2025-01-14 | Xiamen Tianma Micro-Electronics Co., Ltd. | Display panel and display device |
| US12424165B2 (en) | 2022-11-01 | 2025-09-23 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Pixel driving circuit and driving method therefor, display panel, and display device |
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