CN113744683B - Pixel circuit, driving method and display device - Google Patents

Pixel circuit, driving method and display device Download PDF

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Publication number
CN113744683B
CN113744683B CN202111032858.2A CN202111032858A CN113744683B CN 113744683 B CN113744683 B CN 113744683B CN 202111032858 A CN202111032858 A CN 202111032858A CN 113744683 B CN113744683 B CN 113744683B
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control
node
light
circuit
electrically connected
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CN113744683A (en
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程鸿飞
郝学光
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BOE Technology Group Co Ltd
Beijing BOE Technology Development Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Technology Development Co Ltd
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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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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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 Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The invention provides a pixel circuit, a driving method and a display device. The pixel circuit comprises a light emitting element, a first light emitting control circuit, a compensation control circuit, a driving circuit, a conduction control circuit, a data writing circuit, a storage circuit, a second light emitting control circuit and an initialization circuit; the compensation control circuit controls the communication between the first node and the second node under the control of the reset control signal; the conduction control circuit writes the first initial voltage into the third node under the control of the second scanning signal; the initialization circuit writes a second initial voltage to the first electrode of the light emitting element under control of the reset control signal. The invention can ensure that the light-emitting element can emit light normally, and can compensate the threshold voltage of the driving transistor through the compensation control circuit.

Description

Pixel circuit, driving method and display device
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method, and a display device.
Background
When the existing pixel circuit works, the drive transistor cannot be guaranteed to be conducted in a light-emitting stage, and the light-emitting element cannot be guaranteed to emit light normally. Further, the conventional pixel circuit has a problem that the threshold voltage compensation cannot be performed, and the light emission luminance of the light emitting element is related to the threshold voltage of the driving transistor, resulting in display unevenness.
Disclosure of Invention
The invention mainly aims to provide a pixel circuit, a driving method and a display device, which solve the problems that the conventional pixel circuit cannot ensure the conduction of a driving transistor in a light-emitting stage, ensure the normal light emission of a light-emitting element and cannot perform threshold voltage compensation.
In order to achieve the above object, an embodiment of the present invention provides a pixel circuit including a light emitting element, a first light emitting control circuit, a compensation control circuit, a driving circuit, a turn-on control circuit, a data writing circuit, a tank circuit, a second light emitting control circuit, and an initialization circuit, wherein,
the first light-emitting control circuit is respectively and electrically connected with a first light-emitting control line, a power voltage end and a first node and is used for controlling the communication between the power voltage end and the first node under the control of a first light-emitting control signal provided by the first light-emitting control line;
the compensation control circuit is respectively and electrically connected with the reset control line, the first node and the second node and is used for controlling the communication between the first node and the second node under the control of a reset control signal provided by the reset control line;
the control end of the driving circuit is electrically connected with the second node, the first end of the driving circuit is electrically connected with the first node, the second end of the driving circuit is electrically connected with the third node, and the driving circuit is used for controlling the communication between the first node and the third node under the control of the potential of the second node;
the data writing circuit is respectively and electrically connected with the first scanning line, the data line and the third node and is used for writing the data voltage on the data line into the third node under the control of a first scanning signal provided by the first scanning line;
the conduction control circuit is respectively and electrically connected with a second scanning line, a first initial voltage end and the third node and is used for writing a first initial voltage provided by the first initial voltage end into the third node under the control of a second scanning signal on the second scanning line;
the second light-emitting control circuit is respectively and electrically connected with a second light-emitting control line, the third node and the first electrode of the light-emitting element and is used for controlling the communication between the third node and the first electrode of the light-emitting element under the control of a second light-emitting control signal provided by the second light-emitting control line;
the initialization circuit is respectively and electrically connected with the reset control line, the second initial voltage end and the first electrode of the light-emitting element and is used for writing the second initial voltage provided by the second initial voltage end into the first electrode of the light-emitting element under the control of the reset control signal;
the first end of the energy storage circuit is electrically connected with the second node, the second end of the energy storage circuit is electrically connected with the first electrode of the light emitting element, and the energy storage circuit is used for storing electric energy.
Optionally, the on control circuit includes a first transistor;
the control electrode of the first transistor is electrically connected with the second scanning line, the first electrode of the first transistor is electrically connected with the first initial voltage end, and the second electrode of the first transistor is electrically connected with the third node.
Optionally, the first light emitting control circuit includes a second transistor, and the compensation control circuit includes a third transistor;
the control electrode of the second transistor is electrically connected with the first light emitting control line, the first electrode of the second transistor is electrically connected with the power supply voltage end, and the second electrode of the second transistor is electrically connected with the first node;
a control electrode of the third transistor is electrically connected to the reset control line, a first electrode of the third transistor is electrically connected to the first node, and a second electrode of the third transistor is electrically connected to the second node.
Optionally, the data writing circuit includes a fourth transistor;
the control electrode of the fourth transistor is electrically connected with the first scanning line, the first electrode of the fourth transistor is electrically connected with the data line, and the second electrode of the fourth transistor is electrically connected with the third node.
Optionally, the second light-emitting control circuit includes a fifth transistor, and the initializing circuit includes a sixth transistor;
a control electrode of the fifth transistor is electrically connected with the second light-emitting control line, a first electrode of the fifth transistor is electrically connected with the third node, and a second electrode of the fifth transistor is electrically connected with the first electrode of the light-emitting element;
the control electrode of the sixth transistor is electrically connected with the reset control line, the first electrode of the sixth transistor is electrically connected with the second initial voltage terminal, and the second electrode of the sixth transistor is electrically connected with the first electrode of the light emitting element.
Optionally, the driving circuit includes a driving transistor, and the energy storage circuit includes a storage capacitor;
the control electrode of the driving transistor is electrically connected with the second node, the first electrode of the driving transistor is electrically connected with the first node, and the second electrode of the driving transistor is electrically connected with the third node;
the first end of the storage capacitor is electrically connected with the second node, and the second end of the storage capacitor is electrically connected with the first electrode of the light-emitting element.
The invention also provides a driving method which is applied to the pixel circuit, wherein the display period comprises an initialization stage, a data writing stage, a node potential control stage and a light-emitting stage which are sequentially arranged; the driving method includes:
in the initialization stage, a first light-emitting control circuit is controlled to be communicated between a power supply voltage end and a first node under the control of a first light-emitting control signal, and a compensation control circuit is controlled to be communicated between the first node and a second node under the control of a reset control signal so as to be communicated between the second node and the power supply voltage end; the initialization circuit writes a second initial voltage into the first electrode of the light-emitting element under the control of the reset control signal, so that the light-emitting element does not emit light;
in the data writing stage, the data writing circuit writes the data voltage on the data line into a third node under the control of a first scanning signal, and the compensation control circuit controls the communication between the first node and the second node under the control of the reset control signal; the initialization circuit writes the second initial voltage into the first pole of the light-emitting element under the control of the reset control signal so that the light-emitting element does not emit light;
when the data writing phase starts, the driving circuit controls the communication between the first node and the third node under the control of the potential of the second node, and changes the potential of the second node through discharging until the driving circuit is turned off;
in the node potential control stage, a conduction control circuit writes a first initial voltage into the third node under the control of a second scanning signal, so that in the light-emitting stage, the driving circuit can control the communication between the first node and the third node;
in the light-emitting stage, the first light-emitting control circuit controls the power supply voltage end to be communicated with the first node under the control of the first light-emitting control signal; the second light-emitting control circuit controls the third node to be communicated with the first pole of the light-emitting element under the control of a second light-emitting control signal, and the driving circuit drives the light-emitting element to emit light.
The embodiment of the invention also provides a display device which comprises the pixel circuit.
According to the pixel circuit, the driving method and the display device, the conduction control circuit is adopted, so that the driving transistor in the driving circuit can be conducted in the light-emitting stage, the light-emitting element can emit light normally, the threshold voltage of the driving transistor can be compensated through the compensation control circuit, and uniform display is facilitated.
Drawings
Fig. 1 is a block diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a pixel circuit according to at least one embodiment of the invention;
FIG. 3 is a timing diagram illustrating operation of at least one embodiment of the pixel circuit shown in FIG. 2 according to the present invention;
FIG. 4A is a schematic diagram illustrating an operation state of at least one embodiment of the pixel circuit shown in FIG. 2 in an initialization stage t1 according to the present invention;
FIG. 4B is a schematic diagram illustrating an operation state of at least one embodiment of the pixel circuit shown in FIG. 2 in the data writing stage t2 according to the present invention;
FIG. 4C is a schematic diagram illustrating an operation state of at least one embodiment of the pixel circuit shown in FIG. 2 in the node potential control stage t3 according to the present invention;
FIG. 4D is a schematic diagram illustrating an operating state of at least one embodiment of the pixel circuit shown in FIG. 2 in a light-emitting stage t4 according to the present invention;
fig. 5 is a flowchart of a driving method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The transistors used in all embodiments of the present invention may be transistors, thin film transistors or field effect transistors or other devices having the same characteristics. In the embodiment of the invention, in order to distinguish the two poles of the transistor except the control pole, one pole is called a first pole, and the other pole is called a second pole.
In actual operation, when the transistor is a thin film transistor or a field effect transistor, the first electrode may be a drain electrode, and the second electrode may be a source electrode; alternatively, the first pole may be a source and the second pole may be a drain.
As shown in fig. 1, the pixel circuit according to the embodiment of the present invention includes a light emitting element EL, a first light emitting control circuit 11, a compensation control circuit 12, a driving circuit 10, a turn-on control circuit 13, a data writing circuit 14, a tank circuit 15, a second light emitting control circuit 21, and an initialization circuit 22, wherein,
the first light emitting control circuit 11 is electrically connected to a first light emitting control line EM1, a power voltage terminal and a first node N1, and is configured to control communication between the power voltage terminal and the first node N1 under control of a first light emitting control signal provided by the first light emitting control line EM 1; the power supply voltage terminal is used for providing a power supply voltage VDD;
the compensation control circuit 12 is electrically connected to the Reset control line Reset, the first node N1 and the second node N2, and is configured to control communication between the first node N1 and the second node N2 under control of a Reset control signal provided by the Reset control line Reset;
the control end of the driving circuit 10 is electrically connected with the second node N2, the first end of the driving circuit 10 is electrically connected with the first node N1, the second end of the driving circuit 10 is electrically connected with the third node N3, and the driving circuit 10 is used for controlling the communication between the first node N1 and the third node N3 under the control of the potential of the second node N2;
the Data writing circuit 14 is electrically connected to the first scan line Gn, the Data line Data, and the third node N3, and is configured to write the Data voltage on the Data line Data into the third node N3 under the control of the first scan signal provided by the first scan line Gn;
the on control circuit 13 is electrically connected to the second scan line gn+1, the first initial voltage terminal, and the third node N3, and is configured to write the first initial voltage Vini1 provided by the first initial voltage terminal into the third node N3 under the control of the second scan signal on the second scan line gn+1;
the second light emission control circuit 21 is electrically connected to the second light emission control line EM2, the third node N3, and the first electrode of the light emitting element EL, and is configured to control the communication between the third node N3 and the first electrode of the light emitting element EL under the control of the second light emission control signal provided by the second light emission control line EM 2;
the initialization circuit 22 is electrically connected to the Reset control line Reset, the second initial voltage terminal, and the first electrode of the light emitting element EL, and is configured to write the second initial voltage Vini2 provided by the second initial voltage terminal into the first electrode of the light emitting element EL under the control of the Reset control signal;
a first end of the energy storage circuit 15 is electrically connected to the second node N2, a second end of the energy storage circuit 15 is electrically connected to the first pole of the light emitting element EL, and the energy storage circuit 15 is configured to store electric energy;
the second pole of the light emitting element EL is connected to a low voltage VSS.
The pixel circuit according to the embodiment of the invention can ensure that the driving transistor in the driving circuit 10 can be conducted in the light-emitting stage by adopting the conduction control circuit 13, thereby ensuring that the light-emitting element EL can emit light normally, and compensating the threshold voltage of the driving transistor by the compensation control circuit 12, which is beneficial to uniform display.
In the embodiment shown in fig. 1, vini1 and Vini2 may be the same initial voltage Vini, but are not limited thereto.
In the embodiment shown in fig. 1, the light emitting element EL may be an organic light emitting diode, the first pole of the light emitting element EL may be an anode, and the second pole of the light emitting element EL may be a cathode, but not limited thereto.
In operation, the embodiment of the pixel circuit shown in fig. 1 of the present invention may include an initialization phase, a data writing phase, a node potential control phase and a light emitting phase, which are sequentially arranged;
in the initialization phase, the first light emitting control circuit 11 controls the communication between the power supply voltage terminal and the first node N1 under the control of the first light emitting control signal provided by the EM1, and the compensation control circuit 12 controls the communication between the first node N1 and the second node N2 under the control of the Reset control signal provided by the Reset, so that the second node N2 is communicated with the power supply voltage terminal to initialize the potential of the second node N2, so that the driving circuit 10 can control the communication between the first node N1 and the third node N3 under the control of the potential of the second node N2 at the beginning of the data writing phase; the initialization circuit 22 writes the second initial voltage Vini2 to the first electrode of the light emitting element EL under the control of the Reset control signal supplied by Reset so that the light emitting element EL does not emit light;
in the Data writing stage, the Data writing circuit 14 writes the Data voltage Vdata on the Data line Data into the third node N3 under the control of the first scanning signal provided by Gn, and the compensation control circuit 12 controls the communication between the first node N1 and the second node N2 under the control of the Reset control signal provided by Reset; the initialization circuit 22 writes a second initial voltage Vini2 to the first electrode of the light emitting element EL under the control of a Reset control signal supplied from Reset so that the light emitting element EL does not emit light;
at the beginning of the data writing phase, the driving circuit 10 controls the connection between the first node N1 and the third node N3 under the control of the potential of the second node N2, and changes the potential of the second node N2 by discharging until the driving circuit 10 disconnects the first node N1 and the third node N3 under the control of the potential of the second node N2 to compensate the threshold voltage of the driving transistor in the driving circuit 10;
in the node potential control stage, the on control circuit 13 writes the first initial voltage Vini1 into the third node N3 under the control of the second scan signal provided by gn+1, so that in the light emitting stage, the driving circuit 10 can control the communication between the first node N1 and the third node N3, and ensure that the light emitting element EL can emit light normally;
in the light emitting stage, the first light emitting control circuit 11 controls the communication between the power supply voltage terminal and the first node N1 under the control of the first light emitting control signal provided by the EM 1; the second light emission control circuit 21 controls communication between the third node N3 and the first electrode of the light emitting element EL under the control of the second light emission control signal supplied from the EM2, and the driving circuit 10 drives the light emitting element EL to emit light.
Optionally, the on control circuit 13 includes a first transistor;
the control electrode of the first transistor is electrically connected to the second scan line gn+1, the first electrode of the first transistor is electrically connected to the first initial voltage terminal, and the second electrode of the first transistor is electrically connected to the third node N3.
Optionally, the first light emitting control circuit 11 includes a second transistor, and the compensation control circuit 12 includes a third transistor;
a control electrode of the second transistor is electrically connected with the first light emitting control line EM1, a first electrode of the second transistor is electrically connected with the power supply voltage end, and a second electrode of the second transistor is electrically connected with the first node N1;
the control electrode of the third transistor is electrically connected to the Reset control line Reset, the first electrode of the third transistor is electrically connected to the first node N1, and the second electrode of the third transistor is electrically connected to the second node N2.
Optionally, the data write circuit 14 includes a fourth transistor;
the control electrode of the fourth transistor is electrically connected to the first scan line Gn, the first electrode of the fourth transistor is electrically connected to the Data line Data, and the second electrode of the fourth transistor is electrically connected to the third node N3.
Optionally, the second light emission control circuit 21 includes a fifth transistor, and the initialization circuit 22 includes a sixth transistor;
a control electrode of the fifth transistor is electrically connected to the second emission control line EM2, a first electrode of the fifth transistor is electrically connected to the third node N3, and a second electrode of the fifth transistor is electrically connected to the first electrode of the light emitting element EL;
the control electrode of the sixth transistor is electrically connected to the Reset control line Reset, the first electrode of the sixth transistor is electrically connected to the second initial voltage terminal, and the second electrode of the sixth transistor is electrically connected to the first electrode of the light emitting element EL.
Optionally, the driving circuit 10 includes a driving transistor, and the tank circuit 15 includes a storage capacitor;
the control electrode of the driving transistor is electrically connected with the second node N2, the first electrode of the driving transistor is electrically connected with the first node N1, and the second electrode of the driving transistor is electrically connected with the third node N3;
the first end of the storage capacitor is electrically connected to the second node N2, and the second end of the storage capacitor is electrically connected to the first electrode of the light emitting element EL.
As shown in fig. 2, in the pixel circuit according to at least one embodiment of the present invention, the light emitting element EL is an organic light emitting diode O1 based on the pixel circuit shown in fig. 1;
the on control circuit 13 includes a first transistor T1;
the gate of the first transistor T1 is electrically connected to the second scan line gn+1, the source of the first transistor T1 is electrically connected to the initial voltage terminal, and the drain of the first transistor T1 is electrically connected to the third node N3; the initial voltage terminal is used for providing an initial voltage Vini;
the first light emission control circuit 11 includes a second transistor T2, and the compensation control circuit 12 includes a third transistor T3;
the grid electrode of the second transistor T2 is electrically connected with the first light emitting control line EM1, the source electrode of the second transistor T2 is electrically connected with the power supply voltage end, and the drain electrode of the second transistor T2 is electrically connected with the first node N1; the power supply voltage terminal is used for providing a power supply voltage VDD;
a gate of the third transistor T3 is electrically connected to the Reset control line Reset, a source of the third transistor T3 is electrically connected to the first node N1, and a drain of the third transistor T3 is electrically connected to the second node N2;
the data write circuit 14 includes a fourth transistor T4;
the gate of the fourth transistor T4 is electrically connected to the first scan line Gn, the source of the fourth transistor T4 is electrically connected to the Data line Data, and the drain of the fourth transistor T4 is electrically connected to the third node N3;
the second light emission control circuit 21 includes a fifth transistor T5, and the initialization circuit 22 includes a sixth transistor T6;
a gate of the fifth transistor T5 is electrically connected to the second emission control line EM2, a source of the fifth transistor T5 is electrically connected to the third node N3, and a drain of the fifth transistor T5 is electrically connected to an anode of O1;
the grid electrode of the sixth transistor T6 is electrically connected with the Reset control line Reset, the source electrode of the sixth transistor T6 is electrically connected with the initial voltage end, and the second electrode of the sixth transistor is electrically connected with the anode of O1;
the driving circuit 10 includes a driving transistor T0, and the tank circuit 15 includes a storage capacitor Cst;
the grid electrode of the driving transistor T0 is electrically connected with the second node N2, the source electrode of the driving transistor T0 is electrically connected with the first node N1, and the drain electrode of the driving transistor T0 is electrically connected with the third node N3;
the first end of the storage capacitor Cst is electrically connected with the second node N2, and the second end of the storage capacitor Cst is electrically connected with the anode of O1;
the cathode of O1 is connected to the low voltage VSS.
In at least one embodiment of the pixel circuit shown in fig. 2, the first initial voltage terminal and the second initial voltage terminal are the same initial voltage terminal.
In at least one embodiment of the pixel circuit shown in fig. 2, all the transistors are n-type thin film transistors, but not limited thereto.
In at least one embodiment of the present invention, each transistor included in the pixel circuit is exemplified as an n-type transistor, and each transistor may be replaced with a p-type transistor in actual operation.
In at least one embodiment of the pixel circuit shown in fig. 2, vini may be greater than or equal to-3 v and less than or equal to 3 v, but is not limited thereto.
As shown in fig. 3, in operation, at least one embodiment of the pixel circuit shown in fig. 2 of the present invention includes an initialization phase t1, a data writing phase t2, a node potential control phase t3 and a light emitting phase t4, which are sequentially arranged;
in the initialization phase T1, reset provides a high voltage signal, gn and gn+1 provide a low voltage signal, EM1 provides a high voltage signal, EM2 provides a low voltage signal, T4, T5 and T1 are all off, and T2 and T3 are on as shown in fig. 4A to write VDD to N2, so that T0 can be on at the beginning of the data writing phase T2; t6 is turned on to write Vini to the anode of O1 so that O1 does not emit light;
in the Data writing stage t2, reset and Gn supply high voltage signals, gn+1 supplies low voltage signals, EM1 and EM2 supply low voltage signals, and Data supplies a Data voltage Vdata; as shown in fig. 4B, T2 is off, T5 and T1 are off, and T3 and T4 are on to write Vdata to N3 and control communication between N2 and N1; t6 is turned on to write Vini to the anode of O1 so that O1 does not emit light;
at the beginning of the data writing stage T2, T0 is turned on, and the charges stored in Cst are discharged through T2, T3 and T6 to control the potential of N2 to be reduced until T0 is turned off, wherein the potential of N2 becomes vdata+vth, where Vth is a threshold voltage of T0;
in the node potential control stage T3, reset and Gn both provide low voltage signals, gn+1 provides high voltage signals, EM1 and EM2 provide low voltage signals, as shown in fig. 4C, T2, T3, T4, T5 and T6 are all off, T1 is turned on to write Vini to N3 to ensure that in the light emitting stage T4, T0 can be turned on;
in the light emitting period T4, reset, gn, and gn+1 all supply low voltage signals, EM1 and EM2 all supply high voltage signals, as shown in fig. 4D, T3, T6, T4, and T1 are turned off, T2, T5, and T0 all turn on, and T0 generates a driving current Ids to drive O1 to emit light;
in the light-emitting phase t4, the potential of the second end of Cst is changed from Vini to V N3 ，V N3 At the potential of N3 in the light-emitting stage t4, the potential of the first end of Cst (i.e., the potential of N2) becomes Vdata+Vth+V N3 The gate-source voltage Vgs of Vini, T0 is equal to vdata+vth+v N3 -Vini-V N3 ；
Ids＝K(Vgs-Vth) 2 ＝K(Vdata-Vini) 2 ；
K is the current coefficient of T0, and Ids is independent of Vth.
Wherein,,
Figure BDA0003246044840000101
wherein μ is mobility of hole carriers, cox is capacitance per unit area of the gate insulating layer, and W/L is width-to-length ratio of T0.
In operation, at least one embodiment of the pixel circuit of the present invention as shown in fig. 2, during the light emitting phase T4, when both EM1 and EM2 provide high voltage signals, T2 and T5 are turned on, ensuring that O1 does not emit light by mistake.
The driving method of the embodiment of the invention is applied to the pixel circuit, and the display period comprises an initialization stage, a data writing stage, a node potential control stage and a light-emitting stage which are sequentially arranged; as shown in fig. 5, the driving method includes:
s1: in the initialization stage, a first light-emitting control circuit is controlled to be communicated between a power supply voltage end and a first node under the control of a first light-emitting control signal, and a compensation control circuit is controlled to be communicated between the first node and a second node under the control of a reset control signal so as to be communicated between the second node and the power supply voltage end; the initialization circuit writes a second initial voltage into the first electrode of the light-emitting element under the control of the reset control signal, so that the light-emitting element does not emit light;
s2: in the data writing stage, the data writing circuit writes the data voltage on the data line into a third node under the control of a first scanning signal, and the compensation control circuit controls the communication between the first node and the second node under the control of the reset control signal; the initialization circuit writes the second initial voltage into the first pole of the light-emitting element under the control of the reset control signal so that the light-emitting element does not emit light;
when the data writing phase starts, the driving circuit controls the communication between the first node and the third node under the control of the potential of the second node, and changes the potential of the second node through discharging until the driving circuit is turned off;
s3: in the node potential control stage, a conduction control circuit writes a first initial voltage into the third node under the control of a second scanning signal, so that in the light-emitting stage, the driving circuit can control the communication between the first node and the third node;
s4: in the light-emitting stage, the first light-emitting control circuit controls the power supply voltage end to be communicated with the first node under the control of the first light-emitting control signal; the second light-emitting control circuit controls the third node to be communicated with the first pole of the light-emitting element under the control of a second light-emitting control signal, and the driving circuit drives the light-emitting element to emit light.
In the driving method according to the embodiment of the present invention, the on control circuit writes the first initial voltage into the third node under the control of the second scan signal in the node potential control stage, so that the driving circuit can control the communication between the first node and the third node in the light emitting stage, thereby ensuring that the light emitting element can emit light normally, and compensating the threshold voltage of the driving transistor in the driving circuit by the compensation control circuit, which is beneficial to display uniformity.
The display device according to the embodiment of the invention comprises the pixel circuit.
The display device provided by the embodiment of the invention can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (8)

1. A pixel circuit is characterized by comprising a light emitting element, a first light emitting control circuit, a compensation control circuit, a driving circuit, a conduction control circuit, a data writing circuit, a storage circuit, a second light emitting control circuit and an initialization circuit, wherein,
the first light-emitting control circuit is respectively and electrically connected with a first light-emitting control line, a power voltage end and a first node and is used for controlling the communication between the power voltage end and the first node under the control of a first light-emitting control signal provided by the first light-emitting control line;
the compensation control circuit is respectively and electrically connected with the reset control line, the first node and the second node and is used for controlling the communication between the first node and the second node under the control of a reset control signal provided by the reset control line;
the control end of the driving circuit is electrically connected with the second node, the first end of the driving circuit is electrically connected with the first node, the second end of the driving circuit is electrically connected with the third node, and the driving circuit is used for controlling the communication between the first node and the third node under the control of the potential of the second node;
the data writing circuit is respectively and electrically connected with the first scanning line, the data line and the third node and is used for writing the data voltage on the data line into the third node under the control of a first scanning signal provided by the first scanning line;
the conduction control circuit is respectively and electrically connected with a second scanning line, a first initial voltage end and the third node and is used for writing a first initial voltage provided by the first initial voltage end into the third node under the control of a second scanning signal on the second scanning line;
the second light-emitting control circuit is respectively and electrically connected with a second light-emitting control line, the third node and the first electrode of the light-emitting element and is used for controlling the communication between the third node and the first electrode of the light-emitting element under the control of a second light-emitting control signal provided by the second light-emitting control line;
the initialization circuit is respectively and electrically connected with the reset control line, the second initial voltage end and the first electrode of the light-emitting element and is used for writing the second initial voltage provided by the second initial voltage end into the first electrode of the light-emitting element under the control of the reset control signal;
the first end of the energy storage circuit is electrically connected with the second node, the second end of the energy storage circuit is electrically connected with the first electrode of the light emitting element, and the energy storage circuit is used for storing electric energy.
2. The pixel circuit according to claim 1, wherein the on control circuit includes a first transistor;
the control electrode of the first transistor is electrically connected with the second scanning line, the first electrode of the first transistor is electrically connected with the first initial voltage end, and the second electrode of the first transistor is electrically connected with the third node.
3. The pixel circuit according to claim 1, wherein the first light emission control circuit includes a second transistor, and the compensation control circuit includes a third transistor;
the control electrode of the second transistor is electrically connected with the first light emitting control line, the first electrode of the second transistor is electrically connected with the power supply voltage end, and the second electrode of the second transistor is electrically connected with the first node;
a control electrode of the third transistor is electrically connected to the reset control line, a first electrode of the third transistor is electrically connected to the first node, and a second electrode of the third transistor is electrically connected to the second node.
4. The pixel circuit according to claim 1, wherein the data writing circuit includes a fourth transistor;
the control electrode of the fourth transistor is electrically connected with the first scanning line, the first electrode of the fourth transistor is electrically connected with the data line, and the second electrode of the fourth transistor is electrically connected with the third node.
5. The pixel circuit according to claim 1, wherein the second light emission control circuit includes a fifth transistor, and the initialization circuit includes a sixth transistor;
a control electrode of the fifth transistor is electrically connected with the second light-emitting control line, a first electrode of the fifth transistor is electrically connected with the third node, and a second electrode of the fifth transistor is electrically connected with the first electrode of the light-emitting element;
the control electrode of the sixth transistor is electrically connected with the reset control line, the first electrode of the sixth transistor is electrically connected with the second initial voltage terminal, and the second electrode of the sixth transistor is electrically connected with the first electrode of the light emitting element.
6. The pixel circuit of claim 1, wherein the drive circuit comprises a drive transistor and the energy storage circuit comprises a storage capacitor;
the control electrode of the driving transistor is electrically connected with the second node, the first electrode of the driving transistor is electrically connected with the first node, and the second electrode of the driving transistor is electrically connected with the third node;
the first end of the storage capacitor is electrically connected with the second node, and the second end of the storage capacitor is electrically connected with the first electrode of the light-emitting element.
7. A driving method applied to the pixel circuit according to any one of claims 1 to 6, wherein the display period includes an initialization phase, a data writing phase, a node potential control phase, and a light-emitting phase which are sequentially provided; the driving method includes:
in the initialization stage, a first light-emitting control circuit is controlled to be communicated between a power supply voltage end and a first node under the control of a first light-emitting control signal, and a compensation control circuit is controlled to be communicated between the first node and a second node under the control of a reset control signal so as to be communicated between the second node and the power supply voltage end; the initialization circuit writes a second initial voltage into the first electrode of the light-emitting element under the control of the reset control signal, so that the light-emitting element does not emit light;
in the data writing stage, the data writing circuit writes the data voltage on the data line into a third node under the control of a first scanning signal, and the compensation control circuit controls the communication between the first node and the second node under the control of the reset control signal; the initialization circuit writes the second initial voltage into the first pole of the light-emitting element under the control of the reset control signal so that the light-emitting element does not emit light;
when the data writing phase starts, the driving circuit controls the communication between the first node and the third node under the control of the potential of the second node, and changes the potential of the second node through discharging until the driving circuit is turned off;
in the node potential control stage, a conduction control circuit writes a first initial voltage into the third node under the control of a second scanning signal, so that in the light-emitting stage, the driving circuit can control the communication between the first node and the third node;
in the light-emitting stage, the first light-emitting control circuit controls the power supply voltage end to be communicated with the first node under the control of the first light-emitting control signal; the second light-emitting control circuit controls the third node to be communicated with the first pole of the light-emitting element under the control of a second light-emitting control signal, and the driving circuit drives the light-emitting element to emit light.
8. A display device comprising the pixel circuit according to any one of claims 1 to 6.
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